National standard of the People's Republic of China for sodium hypochlorite generator
National standards of the People's Republic of China
GB 12176-90
Sodium hypochlorite generator
1 Topic content and application scope
This standard specifies the product classification, technical requirements, test methods and inspection rules of sodium hypochlorite generator for electrolysis of low concentration salt water by non-diaphragm electrolysis.
This standard applies to sodium hypochlorite generators used in drinking water disinfection, waste water treatment, sanitation and epidemic prevention and industrial production departments.
2 Reference Standards
GB 3859 semiconductor power converter
GB 5461 Edible salt
Hygienic standard for drinking water
GB 5750 Standard for inspection of drinking water
JB 1043 chemical anti-corrosion low voltage electrical appliances
JB 1045 Chemical gas corrosion test method for electrical products
JB 2759 General specification for packaging of mechanical and electrical products
3 Nouns and terms
3.1 Member electrolytic cell
In the electrolytic sodium hypochlorite generator of low concentration salt water electrolytic reaction and solution reaction device is called electrolytic cell. According to the different requirements of operation breadth and use, the electrolytic cell can adopt different tank structure and electrode shape.
3.2 Effective chlorine concentration (C) available chlorine
The oxidation capacity of hypochlorite deficient solution is quantified by effective chlorine concentration. Represents the oxidation capacity per liter of solution equivalent to the oxidation capacity of several grams of chlorine gas in water. The unit of g/L. Effective chlorine concentration is equal to 2 times the concentration of the positive chlorine element in the solution. Each 1g of sodium hypochlorite in the solution contains 0.953g of effective chlorine.
3.3 Effective chlorine production (G) of available chlorine
The output of the sodium hypochlorite generator is expressed by the effective chlorine production rate, which is equal to the mass (g) of effective chlorine generated per hour when the equipment is operating in the rated state, in units of g/h. Effective chlorine production rate is calculated according to Formula (1) :
G = C x Q.......................................................................................... (1)
Where: Q -- flow rate of sodium hypochlorite solution per hour, L/h.
3.4 Current efficiency (H)
After a certain amount of electricity flows through the electrolytic cell, the ratio between the actual and theoretical production of effective chlorine is called the current efficiency of the electrolytic cell. According to Faraday's law of electrolysis, the theoretical production of effective chlorine is 1.323g for every 1A·h electricity passed through the electrolytic cell. Current efficiency can be calculated according to Formula (2) :
H =G/ (I×n×1.323) ×100%…………………………………… (2)
Where: I -- electrolytic current, A;
N -- electrode series;
1.323 -- Theoretical production of effective chlorine per ampere hour of electricity, g/ (A·h).
3.5 Electrolytic Voltage (V) continuous voltage
When the sodium hypochlorite generator works in rated state, the dc voltage applied between anode and cathode of the electrolytic cell is called the electrolytic voltage, in unit (V). When the electrolytic cell works in series power supply mode with multiple pairs of anode and cathode, the electrolytic voltage is represented by the electrolytic voltage between each pair of anode and cathode multiplied by series, such as 4V×3.
3.6 Nominal electrolytic current (I)
The electrolytic current that flows through the electrolytic cell in order to maintain the rated yield of the sodium hypochlorite generator is called the rated electrolytic current (A). When the electrolytic cell of the equipment works in parallel power supply mode with multiple pairs of anode and cathode, the electrolytic voltage is represented by the electrolytic voltage between each pair of anode and cathode multiplied by series, for example, 50A×2.
3.7 Concentration of electrolytic solution (S
Sodium hypochlorite generator uses low concentration salt water as electrolyte. Electrolyte concentration is expressed in grams of NaCl per liter of solution, in g/L.
3.8 PDC DC power consumption
When the sodium hypochlorite generator works in rated state, the direct current energy consumed in the electrolytic cell for generating 1kg effective chlorine is called its direct current power consumption, in unit of (kW·h)/kg. The calculation formula is as follows:
PDC = U * I/I/G = U (Q (C).................................................................................... (3)
Where :U -- electrolytic voltage (VDC);
I -- Electrolytic current (ADC);
G -- Effective chlorine yield (G /h);
Q -- Yield of sodium hypochlorite solution (L/h);
C -- Effective chlorine concentration of sodium hypochlorite (g/L);
3.9 PAC AC power consumption
When the sodium hypochlorite generator works in rated state, every 1kg effective chlorine is generated, the AC power consumed by the whole equipment is called its AC power consumption, in unit of (kW·h)/kg. The calculation formula is as follows:
PAC P1 = x 1000 / G..................................................................... (4)
In the formula: P1 -- the active power input of the whole machine, kW.
Salt consumption (Us
When the sodium hypochlorite generator operates in rated state, the mass of NaCl consumed by 1kg effective chlorine generation is called its salt consumption, in kg/kg, and the calculation formula is as follows:
Us = S/C.......................................................................................... (5)
Where: S -- electrolyte concentration, g/L;
C -- Available chlorine concentration, g/L.
4 Product Classification
4.1 Classification principle, sodium hypochlorite generator is classified according to its use, operation mode, specification and quality grade.
4.1.1 Sodium hypochlorite generator can be divided into sanitary disinfection and environmental protection according to its use. Sanitary and disinfection categories may be used for environmental protection, but environmental protection categories shall not be used for sanitary and disinfection. Sanitary disinfection refers to the sodium hypochlorite generator used for drinking water disinfection, sanitary utensils and tableware disinfection, vegetables, fruits, food disinfection and human health directly related. Environmental protection refers to the sodium hypochlorite generator used for industrial wastewater treatment, hospital sewage treatment and all other industrial sectors using sodium hypochlorite solution and no direct relationship with human health.
4.1.2 The operation mode of sodium hypochlorite generator is divided into continuous operation and intermittent operation.
4.1.3 The specification of sodium hypochlorite occurrence is divided into 5, 10, 25, 50, 75, 100, 150, 200, 250, 300, 400, 500, 750, 1000, 1500, 2000, 3000, 5000g/h according to the effective chlorine production rate of the equipment. If the value exceeds 5000g/h, determine the specifications based on actual requirements.
4.1.4 Sodium hypochlorite generator is divided into high quality products (A), first grade products (B) and qualified products (C) according to the quality grade.
4.2 Product Labeling
4.2.1 The product labeling of sodium hypochlorite generator is composed of three parts, which are arranged in the following order:
Product name; Technical characteristics; Standard number.
4.2.2 Part of the product name is "Sodium hypochlorite generator".
4.2.3 The technical features are composed of letters and numbers indicating the purpose, operation mode, specifications and quality grade of the equipment.
4.2.3.1 The first Hanyu pinyin letter in the technical characteristics section indicates the purpose of the equipment. The letter W stands for sanitation and disinfection, and the letter H for environmental protection.
4.2.3.2 The second Chinese phonetic alphabet in the technical characteristics section represents the operation mode of the equipment, code L-- continuous electrolytic mode, J-- intermittent electrolytic mode.
4.2.3.3 The third Arabic numeral in the technical characteristics section indicates the specification of the equipment and the value is the rated rate of production of the equipment.
4.2.3.4 The fourth letter of the technical characteristics section indicates the quality grade of the product. The letters A- quality products, B- first - level products, C- qualified products.
4.2.4 Part of the standard number in the product mark indicates that the product conforms to this national standard and is represented by GB 12176.
4.3 Product labeling example
For example: sodium hypochlorite generator for sanitary disinfection, continuous operation, rated yield of 100g/h, quality grade up to the first grade, its product is marked as:
Sodium hypochlorite generator WL 100B GB 12176--90
4.4 The quality grade marks used in the product marks and the marks that meet the requirements of the national standard must be recognized by the national specialized organs or designated quality monitoring units.
4.5 The specific model of the product is allowed to be determined by the manufacturer according to the requirements of this Standard.
5 Technical Requirements
5.1 Use of environmental conditions: Sodium hypochlorite generator should be able to work normally in the following environment.
5.1.1 Ambient temperature :0 ~ 40℃.
5.1.2 Ambient humidity: the maximum relative humidity in the air shall not exceed 90%(when the air is equivalent to 20±5℃).
5.1.3 The low-voltage electrical appliances selected on the sodium hypochlorite generator with high quality grade shall not only meet the technical requirements of its independent products, but also meet the provisions of JB 1043.
5.2 Basic technical requirements
5.2.1 The sodium hypochlorite generator shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures.
5.2.2 Specifications of sodium hypochlorite generator shall meet the requirements of article 4.1.3 of this standard.
5.2.3 Sodium hypochlorite generator shall be divided into quality grades according to article 5.4 of this standard. Products that reach a certain quality grade shall meet the requirements of various indicators in this grade.
5.2.4 The sodium hypochlorite generator must be equipped with shell grounding bolts. There is a reliable electrical connection between the metal structure parts of the power supply in each part of the shell and the grounding bolt, and the measured value of the connection resistance is less than 0.1W. The grounding bolt should be marked with an obvious grounding mark.
5.2.5 The electrolytic cell and liquid storage tank used by the equipment with production rate greater than 25g/h must adopt a closed structure, and there shall be a standard interface between the equipment and the outdoor exhaust pipe path.
5.2.6 Equipment with production rate greater than 25g/h shall have interchangeability standard interfaces connected with auxiliary brine dispensing and filling devices.
5.2.7 Electrolytic current and electrolytic voltage monitoring instruments must be set for equipment with production rate greater than 25g/h, and the accuracy shall not be lower than 2.5. Electrolyte flow meter must be set for continuous operation equipment, intermittent operation equipment must be
5.2.8 Physicochemical properties requirements of sodium hypochlorite solution produced by the equipment.
5.2.8.1 Sodium hypochlorite solution shall be clear and transparent with no visible impurities.
5.2.8.2 The content of heavy metal ions chromium and lead in the sodium hypochlorite solution produced by the sodium hypochlorite generator for sanitary disinfection shall comply with the relevant provisions of Water Quality standards and hygiene requirements in Chapter 2 of GB 5749.
5.2.8.3 Sodium hypochlorite generators used for sanitary disinfection shall not use graphite electrodes and lead dioxide coated anodes.
5.3 Operation parameters and performance of sodium hypochlorite generator.
5.3.1 Power supply: Input power of sodium hypochlorite generator shall be:
AC 220 v / 380 v + 10% for 50 hz plus or minus 5%
5.3.2 Adjustment range of electrolytic current shall be greater than ±10% of rated electrolytic current.
5.3.3 The sodium hypochlorite generator should be able to guarantee the rated production rate of the equipment under long-term working conditions, and can work safely for 1h with 10% excess production rate.
5.3.4 It is recommended that the concentration range of civil solution be 30 ~ 50g/L. A fixed concentration of electrolyte selected within this range shall be used throughout the performance test of the equipment.
5.3.5 Electrolyte consumption In the continuous operation of the civil solution tank is expressed by the electrolyte flux per hour, unit L/h. In the intermittent electrolytic cell, it is expressed by the amount of salt water and the electrolytic period (h) of each electrolytic cycle in civil solution, in unit L/h, such as 50L/1.5h.
5.3.6 The product shall indicate the external dimensions, weight and installation dimensions of the equipment and auxiliary equipment. For drinking water disinfection and sewage treatment, installation diagram should be provided with the equipment.
5.3.7 The equipment shall ensure that the temperature of the electrolyte is less than 40℃ in the process of electrolysis, and appropriate cooling measures shall be taken if necessary.
5.4 Technical and Economic Indicators and Quality Rating (Table 1)
Table 1 Technical and economic indicators and quality grade
Technical and economic indicators unit quality grade
A B C
Current efficiency % of electrolytic cell ≥72 ≥65 ≥60
Dc power consumption kW•h/kg ≤4.5 ≤5.0 ≤6.5
Ac power consumption kW•h/kg ≤6.0 ≤7.0 ≤10
Salt consumption Kg/ Kg ≤4.0 ≤4.5 ≤6.5
Failure time of anode life strengthening test H ≥20 ≥15 ≥10
5.5 Appearance Requirements
5.5.1 The appearance of the equipment shall be neat and beautiful, and the instruments, switches, indicators and signs on the disk shall be properly installed, firm and reliable.
5.5.2 Coating layer shall be sprayed on the surface of the equipment with no blinding reflection, uniform color, clean surface, and no flow marks, bubbles, cracks, paint leakage and peeling phenomenon.
5.5.3 The welding of the equipment skeleton and shell shall conform to the requirements of GB 985 "Basic Type and Size of Manual Arc Welding Joints". All welding places are uniform and firm, without obvious deformation or burning defects, and there shall be no hammer marks and obvious convex and concave phenomena on the surface.
5.6 Electrolytic power supply for sodium hypochlorite generator.
5.6.1 Electrolytic power supply of sodium hypochlorite generator shall work normally under the following conditions.
5.6.1.1 The voltage amplitude of the input power supply shall fluctuate continuously within the range of ±10% of the rated value.
5.6.1.2 Frequency variation shall not exceed ±5% of the rated value.
5.6.2 Insulation test of electrolytic power supply of sodium hypochlorite generator includes two parts: withstand voltage test and measurement of insulation resistance. Specific technical requirements should comply with relevant provisions of GB 3859.
5.6.3 The temperature rise test of electrolytic power supply of sodium hypochlorite generator shall comply with the provisions of Table 2.
Table 2 Ultimate temperature rise of each component of electrolytic power supply
Method for measuring the limit temperature rise of a component or device
Rectifier tube housing see rectifier tube technical conditions thermocouple or thermal sensitive device
Wire connector 45℃ thermometer method, thermocouple method, thermal sensitive device
Transformer coil 80℃ resistance method
Core surface 60℃ thermometer method
5.6.4 The electrolytic power supply shall be equipped with an electrolytic current regulating and controlling device. Within the allowable input voltage range of the equipment, the dc electrolytic current regulating range shall meet the provisions of Article 5.3.2 of this standard.
5.6.5 The electrolytic power supply shall be able to work continuously for 1h without damage under the condition that the current exceeds the rated electrolytic current by 10%.
5.7 cell
5.7.1 Electrolytic cell shall be made of materials resistant to corrosion of sodium hypochlorite.
5.7.2 The electrolytic cell must be equipped with measures to separate electrolytic gas and electrolyte.
5.7.3 The electrolytic cell must be equipped with an electrolyte vent. After opening the vent valve, the electrolyte shall be completely discharged within 5 minutes.
5.7.4 The structural design of the electrolytic cell shall be convenient for the cleaning of the electrode, and the anode and cathode of the electrolytic cell shall be conveniently disassembled.
5.7.5 Measures to prevent electrode scaling from affecting the operation of sodium hypochlorite generator electrolytic cell shall be taken into consideration. The equipment shall ensure the accumulative operation of more than 250h without maintenance and without pickling of electrodes.
5.7.6 For the electrolytic cell with continuous operation, if there is pressure flow in the cell, the shell shall be subjected to 1.5 times of working pressure in the hydrostatic test without leakage or leakage.
5.8 Electrolytic Electrode
5.8.1 Electrolytic anode life
The corrosion resistance and service life of the electrolytic anode shall be assessed by the failure time of the electrode in the sulfuric acid solution with high current density for enhanced life test. Equipment of different quality grades shall meet the corresponding requirements in article 5.4 of this standard.
5.8.2 Electrolytic anode must be active anode with metal oxide coating.
5.8.3 The cathode material shall be 1Cr18Ni9Ti or stainless steel with better corrosion resistance than other stainless steel. Pure titanium or titanium alloy can also be used.
5.9 Salt water dispensing device
5.9.1 The saturated salt water tank in the brine dispensing device shall be able to hold the solid salt required by the supporting equipment for 100h operation.
5.9.2 The brine dispensing system, box body, pipes and valves shall be made of anticorrosive materials.
5.9.3 The salt water concentration prepared by the salt water dispensing device shall comply with the provisions of Article 5.3.5 of this standard, and the concentration change shall be less than ±10% of the set value during continuous operation.
5.9.4 The turbidity of the prepared salt water should be less than 20mg/L.
5.9.5 The salt water mixing device used for continuous operation equipment must have measures to maintain the constant flow of electrolyte. When the sodium hypochlorite generator works normally, the variation range of the salt water flow should be less than ±10% of the rated flow.
5.9.6 The manufacturer shall provide detailed drawings for the saltwater dispensing device supporting the sodium hypochlorite generator if it is necessary to build structures on site.
5.10 Storage tank for sodium hypochlorite solution
5.10.1 When the effective chlorine production rate of the sodium hypochlorite generator with intermittent operation is greater than 25g/h, the sodium hypochlorite solution storage tank must be provided.
5.10.2 The effective volume of the liquid storage tank shall be greater than the volume of sodium hypochlorite solution generated by the full load operation of the equipment for 4h.
5.10.3 The liquid storage tank of sodium hypochlorite solution shall be equipped with level gauge, level gauge scale and level mark of rated capacity.
5.10.4 The liquid storage tank of sodium hypochlorite solution shall be equipped with a liquid empting port. After opening the liquid empting valve, all the liquid shall be removed within 10min.
5.10.5 The liquid storage tank shall be made of light-proof corrosion-resistant materials.
6 Test Method
6.1 Physical and chemical properties test of sodium hypochlorite solution
6.1.1 Sensory detection of sodium hypochlorite solution
Under normal operation of the equipment, take out the sodium hypochlorite solution in the electrolytic cell with 100ml beaker. The color and transparency of the solution shall be checked by manual visual inspection, and the result shall meet the provisions of article 5.2.8.1 of this standard.
6.1.2 Test method for effective chlorine concentration of sodium hypochlorite solution
6.1.2.1 Assay Principle: In acidic solution containing potassium iodide, sodium hypochlorite and potassium iodide undergo REDOX reaction and release equivalent iodine. Titrate with sodium thiosulfate standard solution. Calculate effective chlorine concentration of sodium hypochlorite solution according to the amount of sodium thiosulfate solution.
6.1.2.2 reagent
A. Potassium iodide solution :1N, analytical pure (GB 1272);
B. Glacial acetic acid: 36%, analytical pure (GB 676);
C. Starch indicator: see 15.14.10 in GB 5750;
D. Sodium thiosulfate standard solution :0.05N. For its preparation and calibration method, see article 15.1.4.3 in GB 5750.
6.1.2.3 Test Procedure
A. Use a pipette to absorb 5ml shaken sodium hypochlorite solution to be tested and place it in a 250ml iodine flask;
B. Add 50ml distilled water to the iodine measuring bottle;
C. Quickly add 5 ml of 36% glacial acetic acid solution into iodine measuring flask, seal with water and shake well;
D. Add 1N potassium iodide solution 10ml into the iodine measuring bottle, seal it with water and shake it well;
E. Stand in the dark for 5 minutes;
F. Titrate the sample with 0.05N sodium thiosulfate standard solution;
G. Add 1ml starch indicator when the sample changes from brownish yellow to light yellow during titration;
H. Continue titration with sodium thiosulfate standard solution until the blue color is just gone;
I. Record ml of titrant consumed.
6.1.2.4 After the test, calculate the effective chlorine concentration of sodium hypochlorite solution according to Formula (6), unit: g/L;
C = N * V * 35.45/5........................................................................ (6)
Where :35.45 -- atomic weight of chlorine;
C -- effective chlorine concentration;
N -- Equivalent concentration of sodium thiosulfate standard solution,N;
V -- Volume of sodium thiosulfate standard solution consumed during titration, in mL.
6.1.3 Test of heavy metal ion content in sodium hypochlorite solution.
Hygienic and disinfection equipment shall be determined for heavy metal ion content in accordance with article 5.2.8.2 of this standard. The assay shall be performed according to the relevant methods and procedures specified in GB 5750.
The electrical components of the sodium hypochlorite generator of superior quality shall meet the provisions of article 5.1.3 of this standard, but the test may not be carried out when the manufacturer of low-voltage electrical components provides the certificate of qualification for this technical requirement. The test results provided by the manufacturer shall be tested in accordance with the test method specified in JB 1045. Chlorine gas is used as the chemical gas, and the concentration of chlorine gas is 1mg/L. The test should be carried out for 10 cycles according to the provisions.
6.3 Intuitive Check
Article 5.2.1 to 5.2.7 of Article 5.2 basic technical requirements and article 5.5 of appearance requirements in this standard shall be inspected visually.
6.4 The test method of voltage resistance test and insulation resistance measurement of electrolytic power supply shall comply with the relevant provisions of GB 3859.
6.5 Temperature rise test method of electrolytic power supply can be carried out in accordance with the relevant provisions of GB 3859. Temperature rise test can be carried out simultaneously with continuous operation.
6.6 Power on operation test of sodium hypochlorite generator to check the working state of the whole equipment and the adjustment range of electrolytic current.
6.6.1 Before the test, check the assembly of the circuit and pipeline according to the requirements of the drawing, and connect the brine pipeline after the check is normal, and fill the electrolyte according to the rated state of the equipment. All parts should work normally and without leakage.
6.6.2 Connect the power line of the equipment and adjust the electrolytic current to the rated value. The equipment shall work normally for 30min electrolytic.
6.6.3 Adjust the electrolytic current control unit in the outside power supply voltage for the rating to 10%, the output electrolytic current should be able to adjust to the rating of + 10%, adjust the electrolytic current control device in the outside power supply electric desire of rating to 10%, when the test input allows for self coupling voltage regulator for changing the input voltage value, the test results should comply with this standard articles 5.3.2 and 5.6.1.1 Requirements.
6.6.4 After the test, the electrolytic cell and liquid storage tank shall be emptied and the empting time shall be recorded. The discharge time shall conform to the requirements of Article 5.7.3 and 5.10.4 of this standard.
6.7 Continuous operation test (electrolytic voltage, rated yield, current efficiency, DC power consumption, AC power consumption, salt consumption, machine input power, electrolyte temperature rise and electrolytic power supply temperature rise test).
6.7.1 Test method: Use sodium hypochlorite generator to work continuously under the rated working state specified in Article 6.7.2, record the operation parameters as shown in Article 6.7.4 during the operation, and calculate each parameter according to the prescribed formula.
6.7.2 Rated working state of continuous running test.
6.7.2.1 The electrolyte used in the test shall meet the following requirements:
A. The electrolyte is prepared with refined salt and tap water. Refined salt should meet the requirements of refined salt in GB 5461. Tap water quality should meet GB 5749 standard of drinking water;
B. Electrolyte concentration and its variation range in the test shall comply with the provisions of Article 5.9.3 of this Standard;
C. The temperature of the electrolyte input into the electrolytic cell in the test should be 20±5℃;
D. The rated electrolyte flow rate shall be maintained during the test. For continuous operation, flow rate variation shall be less than ±5% of the rated value. For intermittent operation, electrolyte injection volume and electrolytic time should be maintained at rated values.
6.7.2.2 The electrolytic current in the test shall maintain the rated value, and the deviation shall be less than ±2.5%. A voltage regulator or voltage regulator can be added to the power input.
6.7.3 Operation time of continuous electrolytic cell: the intermittent electrolytic cell shall work for 4 electrolytic cycles within 4 hours after the equipment is turned on and stabilized.
6.7.4 Operation data record: continuous electrolysis in running every 0.5 h, intermittent electrolysis, the beginning and the end of each cycle of electrolytic shall faithfully record the following data operation: electrolytic time, input power supply voltage, the input power supply current, electrolytic voltage, electrolytic current, the electrolyte flow rate (capacity) electrolyte, electrolyte concentration and the flow of sodium hypochlorite solution containing active chlorine, sodium hypochlorite solution Quantity, electrical contact temperature, electrolyte temperature, sodium hypochlorite solution temperature, ambient temperature, laboratory personnel signature, etc. When recording the instrument display data of the equipment itself, the instrument display data of the laboratory installed in the test should be recorded at the same time.
6.7.5 Instrument for test: The precision of laboratory instrument used in the test shall not be less than 0.5 grade, and the resolution of thermometer shall be 0.2℃.
6.7.6 In the experiment, the flow rate Q of sodium hypochlorite solution in the continuous electrolytic cell was calculated by dividing volume by time with measuring cylinder and stopwatch. Each flow parameter should be sampled for more than 3 times, and each sampling time should be no less than 1min, and the average value of several measurements can be obtained.
6.7.7 Calculation of effective chlorine yield
For continuous operation of the sodium hypochlorite generator, available chlorine yield calculation according to the article 3.3 of this standard in the formula (1) calculation, calculation when sodium hypochlorite solution flow rate Q running test of the time and the mean of the flow of sodium hypochlorite solution, the concentration of available chlorine C, also take the time and the mean of the listen to the concentration of available chlorine.
For the sodium hypochlorite generator with intermittent operation, the salt water consumption in each electrolytic cycle is represented by the electrolytic liquid product divided by the electrolytic time, and the effective chlorine production rate in each cycle is calculated according to formula (1). The effective chlorine production rate of the tested equipment is the average value of the measured chlorine production rate in several electrolytic cycles.
6.7.8) calculated h current efficiency (
Base on the measured yield (G) and the average electrolysis current during the continuous casting test, the calculation is performed according to formula (2) as described in Article 3.4 of this standard.
6.7.9 Calculation of DC power consumption
The average value of electrolytic voltage, electrolytic current and effective chlorine yield in continuous operation test is calculated according to formula (3) in Article 3.8.
6.7.10 Calculation of ac power consumption test results
The average value of ac input power and rated yield obtained from continuous operation test is calculated according to formula 3.9 (4).
6.7.11 Cabinet Input Power (P1)
In the test, it can be calculated by dividing the measured value of the watt-hour meter installed on the equipment power supply line by the electrolytic time under the rated operation state, or directly measured by the watt-meter, unit kW.
6.7.12 Temperature rise of electrolyte
For continuous running electrolytic cell, the temperature rise of electrolyte shall be the outlet temperature of sodium hypochlorite solution at the end of continuous running test minus the inlet temperature of electrolyte, in unit of ℃.
For intermittent running electrolytic cells, the temperature of the sodium hypochlorite solution at the end of an electrolytic cycle is taken from the temperature of the electrolyte at the beginning of the electrolytic cycle, in ℃.
6.7.13 Electrical contact Temperature Rises
In steady work, when the testing point of temperature change is less than 1 ℃ / h, contact temperature and environmental temperature for the rise of temperature of the point, the difference between the electrical contact temperature measurement using semiconductor thermometer, ambient temperature measurement using more than two glass thermometer, the 1 m far from the equipment installation, the position of the height of 1 m, temperature rise test in the ambient temperature at 10 ~ 40 ℃ fan Inside the enclosure, there should be no exposure to light, thermal radiation and air currents that may affect the temperature rise test.
6.7.14 During the test, the error between the display value of the instrument on the equipment and that of the 0.5 level instrument should be less than 2.5%.
6.8 Overload test
The overload test shall be carried out after the continuous working test. During the test, the electrolytic current and electrolyte flow shall be maintained at 110% of their respective rated values respectively. The overload test duration is 1h, and the equipment shall work normally with no damage to the components, in line with the relevant provisions of article 5.3.3 of this standard.
6.9 Sodium hypochlorite generator without cleaning electrode cumulative working time test
6.9.1 Make the equipment to be tested work under the rated working state specified in Article 6.7.2 of the standard. The electrolytic flow used in the test shall meet the requirements specified in Article 6.7.2.1, but the total hardness of tap water used (measured by calcium carbonate) shall be greater than or equal to 200mg/L. If necessary, the water shall be manually distributed, and the operation parameters specified in Article 6.9.4 shall be recorded. When the equipment occurs one of the phenomena described in Article 6.9.2, the electrode shall be cleaned and the test shall be finished. The accumulated working time before this shall be the accumulated working time of the equipment without cleaning the electrode.
6.9.2 Judging the conditions for cleaning electrodes: the actual electrolytic cell voltage increases by 50% compared with the normal electrolytic voltage; Electrolytic current can not reach the rated value; Breakdown occurs between electrolytic cathode and anode due to scaling; Electrolyte flow can not reach the rated value because of blockage between electrodes; Effective chlorine production rate does not reach the rated value; The equipment cannot run normally because of electrode scaling.
6.9.3 The test is allowed to be carried out intermittently, and it is allowed to be carried out by the manufacturer and inspection unit during the user use test phase.
6.9.4 In operation, record the test time, accumulated operation time, electrolytic voltage, electrolytic current, electrolyte consumption and other parameters every day to test the yield of one hour or one electrolytic cycle.
6.10 Electrolytic anode strengthening life test
6.10.1 Test Principle
The fast life stool test method of anode electrolysis in sulfuric acid solution with high current density was adopted to compare the service life of different electrodes by testing the failure time of electrode strengthening life test with different anodes working in sulfuric acid solution with the same concentration and temperature and under the same high current density.
6.10.2 Test device
A. 500 ml beaker;
B. Test anode: The anode used in the test shall be taken directly from the electrode of the test equipment and processed. The active coating on the surface of the anode was machined by breakage method to retain an effective reaction area (projected area) of 1.0cm2±5%.
C. Cathode: 1Cr18Ni19Ti stainless steel. When the tested anode is flat, the cathode is plate-like; when the tested anode is tubular, the cathode is circular. The effective conductive area of the cathode should be much larger than the effective anode reaction area, and the distance between anode and cathode should not be less than 1cm.
D. Dc constant power supply with rated current greater than 3A shall be used for the electrolytic power supply for the test;
E. Accuracy of DC ammeter and DC voltmeter used in the test is 0.5;
F. Precision constant temperature water bath, water temperature control accuracy should be less than ±1℃.
6.10.3 Test conditions
A. Electrolyte :1.0N H2SO4(GB 625);
B. Electrolyte temperature :40±1℃;
C. Anode current density :200A/dm2.
6.10.4 Procedure
A. Pour 1.0N H2SO4 solution into the beaker, fix the anode and cathode and completely flood the effective working part of the anode;
B. After the temperature of the electrolyte rises to 40℃, switch on the power supply and adjust the electrolytic current as the specified value, and maintain its constant during the test. During the electrolytic process, a certain amount of distilled water and H2SO4 are added irregularly to maintain the electrolyte level and concentration;
C. Record the electrolytic time, electrolytic current and electrolytic cell voltage every half an hour;
D. stop the test when the electrolytic cell voltage begins to rise rapidly and substantially;
E. The accumulated electrolytic time from the beginning of the test to the beginning of a substantial increase in the electrolytic cell voltage is called the enhanced life test failure time of the tested electrode.
6.11 Determination of brine concentration
The hydrometer of gravimetric method shall be adopted. In case of any discrepancy, the gravimetric method shall prevail.
7 Inspection Rules
7.1 There are two types of inspection: ex-factory inspection and type inspection
7.2 Delivery inspection
7.2.1 Before delivery, the equipment shall be inspected one by one according to the specified items and test methods, and the products shall be delivered to use only after passing the inspection.
7.2.2 Delivery inspection items
Visual inspection, power operation and insulation test shall be carried out in accordance with the requirements of Articles 5.2.4, 5.5, 5.6.2 and 5.6.4 of this standard and the provisions of Articles 6.3 and 6.6 of this standard.
7.3.1 Type test must be carried out if one of the conditions exists
A. Test and finalize the production of new products or old products transferred to the factory;
B. After formal production, the main materials and components of the product are changed greatly, the structural parameters of the electrolytic cell are changed, and the electrode processing technology is changed;
C. In normal production, 100 sets shall be produced each (once a year if the annual output is less than 100 sets);
D. When the product is suspended for a long time and the production is resumed;
E. If there is a big difference between the ex-factory inspection result and the last type inspection;
F. When the national quality supervision agency puts forward the requirements for type inspection.
7.3.2 Type inspection shall be conducted according to the technical requirements in Chapter 5 of this Standard and the test method specified in Chapter 6.
7.3.3 In the type inspection, if there is a certain unqualified item of any equipment inspected, double sampling shall be taken from the batch of products and the unqualified item shall be reinspected. If the unqualified item is still unqualified, the production shall be stopped and the type inspection shall be conducted again after the reason is found out.
7.3.4 The number of sample sets for type inspection shall be no less than 3 sets.
7.3.5 The products that do not pass the type test cannot be produced.
8 Marking, packaging, transportation and storage
8.1 The nameplate shall be fixed at the specified position for each device, and the content of the nameplate shall be as follows:
A. Manufacturer's name and trademark;
B. Equipment name;
C. Product marks and product models;
D. Equipment manufacturing number (or date) or production lot number;
E. Main technical parameters of the product (including chlorine yield, power supply voltage, rated electrolytic current, electrolytic voltage, electrolyte concentration and electrolyte consumption).
8.2 the packing
8.2.1 Packing method: Generally packed in boxes, some spare parts and accessories can also be packed in bundles.
8.2.2 The package shall be moisture-proof and shockproof. The dimensions and weight of the package shall conform to JB 2759. The top of the package shall be flat.
8.2.3 Before packing the products, the center of gravity should be placed in the middle and lower, and the products with a higher center of gravity should be packed horizontally as far as possible. Balance measures should be taken for products whose center of gravity deviates from the center of gravity.
8.2.4 The packing cases shall have sufficient strength, and the lifting test, stacking test and road transportation test shall comply with JB 2759.
8.2.5 The products shall be packed against rain and shall meet the requirements of 2.7 in JB 2756.
8.2.6 The packaging marks shall be accurately, clearly and firmly sprayed on the box surface with indelible paint and ink. The marks generally include:
A. Product model, name, specification and quantity;
B. case number;
C. Maximum external dimension of box body [l × W × H (cm)];
D. Net and gross weight (kg);
E. Made in the People's Republic of China (this mark is not required for domestic shipment).
8.2.7 When the products are packed in multiple boxes, the number of boxes shall be expressed by fractions. The numerator is the number of boxes and the denominator is the total number of boxes. The main box shall be no. 1.
8.2.8 For packages that need to be lifted and the center of gravity deviates obviously from the center, "lifting from here" and "center of gravity" should be marked and accurately sprayed on the corresponding parts of the package.
8.2.9 The attached files include:
A. Operating instructions;
B. Certificate of Conformity;
C. Packing list;
D. Attached list;
E. Other relevant technical information.
When unpacking, the documents are usually placed in the main box.
Additional notes:
This standard is proposed by the Ministry of Construction of the People's Republic of China.
This standard by the ministry of Construction of urban water treatment equipment standard technology unit.
This standard is drafted by North China Design Institute of Municipal Engineering of China, Wuhan Instrument Factory of ministry of Aerospace Industry, Tianjin Second Analytical Instrument Factory and Jiangsu Jingjiang Water Purification Equipment Factory.
The main drafters of this standard are Liu Xiaosong and Yin Guanhua.
This standard entrusts China municipal engineering North China Design Institute to interpret.
