CB 3521-1993 General Technical Requirements for Hydrogen Production by Water Electrolysis CB3521-1993 Standard download decompression password: www.bzxz.net

Shipbuilding Industry Standard of the People's Republic of China
CBT3521-93
General Technical Requirements for Hydrogen Production by Water Electrolysis
Published on November 8, 1993
Published by China State Shipbuilding Corporation
Implemented on May 1, 1994
Shipbuilding Industry Standard of the People's Republic of China
General Technical Requirements for Hydrogen Production by Water Electrolysis
Subject Content and Scope of Application
CB 3521-93
Classification Number: U77
This standard specifies the technical requirements, test methods and inspection rules for industrial filter-press water electrolysis hydrogen production devices. This standard applies to industrial filter-press water electrolysis hydrogen production devices (hereinafter referred to as devices). 2 Reference standards
GB150 Steel pressure vessels
GB191 Pictorial symbols for packaging, storage and transportation
GB629 Sodium hydroxide
GB708 Rolled thin steel plates
GB710 High-quality carbon structural steel thin plates
GB979 Classification and technical conditions of carbon steel castingsGB1220 Stainless steel bars
GB2306 Potassium hydroxide
GB3634 Industrial hydrogen
GB3836 Industrial gaseous oxygen
GB4962 Safety technical regulations for the use of hydrogen
GB6516 Electrolytic Nickel
GB6682 Laboratory Water Specifications
GBn193 General Technical Conditions for Packaging of Export Machinery, Electrical, Instruments and Meters Products JB8 Product Labels
JB2759 General Technical Conditions for Packaging of Electromechanical Products JC211 Asbestos Cloth for Mold Separation
3 Technical Requirements
3.1 Environmental Conditions
The explosion-proof requirements of the hydrogen production room shall comply with the provisions of GB4962; a.
b. Ambient temperature: 5~45℃;
c. Relative humidity: <90%.
3.2 Conditions of Use
3.2.1 The quality of the raw water for electrolysis shall not be lower than the requirements of Grade 3 water in GB6882. 3.2.2 The pipeline for conveying raw water shall be corrosion-resistant and clean pipes. 3.2.3 Potassium hydroxide or sodium hydroxide used to prepare the electrolyte shall comply with the provisions of GB2306 or GB629 respectively. 3.3 The gas-liquid separation scrubber in the equipment, which is a low or medium pressure vessel, shall comply with the relevant provisions of GB150 and the "Regulations on Safety Technical Supervision of Pressure Vessels" issued by the Ministry of Labor. Approved by China State Shipbuilding Corporation on November 8, 1993, implemented on May 1, 1994
3.4 ​​See Table 1 for main technical indicators
Hydrogen output
Oxygen output
Hydrogen purity
Oxygen purity
CB3521-93
Main technical indicators
Unit DC power consumption of hydrogen gas kW·h/m3
3.5 Materials
3.5.1 The main plate is made of high-quality carbon steel plate, the thickness tolerance shall comply with the requirements of Class B in GB708, and the surface quality shall comply with the requirements of Class II in GB710.
3.5.2 The material used for nickel wire mesh shall comply with the provisions of GB6516. 3.5.3 Steel castings shall comply with the provisions of GB979. 3.5.4 Stainless acid-resistant steel shall comply with the provisions of GB1220. 3.5.5 The diaphragm asbestos cloth shall comply with the provisions of JC211. 3.6 The purchased parts supporting the device must have a certificate of conformity and be accepted according to the standards or the contract requirements of both parties. 3.7 The design life of the main unit of the device is 20 years, and the overhaul period under normal working conditions shall not be less than 5 years. 4 Test method
4.1 Test conditions
4.1.1 The performance test of the device can be carried out at the manufacturer or the user's site. 4.1.2 Before the test, the whole system shall be tested for air tightness, and the test requirements and methods shall comply with the relevant provisions of GB150. 4.1.3 The accuracy level of the test instruments and meters shall not be lower than the provisions of this standard, and shall be calibrated regularly. 4.1.4 The hydrogen and oxygen operating systems must be purged with nitrogen before the power-on test. 4.1.5 The test site is well ventilated.
4.2 Performance test
4.2.1 Hydrogen and oxygen gas production
The determination of hydrogen and oxygen gas production can be carried out by current calculation method and volumetric method. 4.2.1.1 Current calculation method
The hydrogen production is calculated according to formula (1):
Q,=4.18Inn×10
CB3521-93
Where: Q
Hydrogen production under standard conditions, m2/h
DC current of electrolyzer, A;
Number of small chambers of electrolyzer, pieces;
Current efficiency, 99%.
The oxygen production is half of the hydrogen production.
4.2.1.2 Determination by volumetric method See Appendix A (Supplement). 4.2.2 Purity of hydrogen and oxygen gas
4.2.2.1 The purity of hydrogen gas shall be determined in accordance with the provisions of GB3634. 4.2.2.2 The purity of oxygen gas shall be determined in accordance with the provisions of GB3863. 4.2.3 Unit DC power consumption
4.2.3.1 Measuring instrument
a. DC ammeter, precision level 1;
b. Digital voltmeter, precision level 1.
4.2.3.2 Determination method
While determining the gas output, use an ammeter to measure the total current flowing through the electrolytic cell, and use a voltmeter to measure the total voltage of the electrolytic cell. Measure three times at the beginning, middle and end of the test, and take the average value of the current and voltage. 4.2.3.3 Principle
Unit DC power consumption is the ratio of the DC power consumed by the device per unit time to the gas output produced in the same time, calculated according to formula (2):
Unit DC power consumption, kW·h/m
Where: W
U—DC working voltage of electrolytic cell, V;
I—DC current of electrolytic cell, A;
Q—gas volume under standard conditions, m/h. 5 Inspection rules
5.1 The factory inspection of the device can be carried out unit by unit at the manufacturer or on-site of the user, and the quality inspection department of the manufacturer shall issue a document certifying the quality of the product.
5.2 After the device is connected, it shall be operated continuously for 24~72h under rated operating conditions to assess the operating performance of the device. The inspection items and methods are shown in Table 2.
Hydrogen and oxygen gas output
Hydrogen and oxygen gas purity
Unit hydrogen gas DC power consumption
CB 3521-93
See No. 1 and 2 in Table 1
See No. 3 and 4 in Table 1
See No. 5 in Table 1
5.3 During the inspection, if one indicator fails to meet the requirements, the cause should be found and repaired;
If it still fails to meet the requirements after re-inspection, the device cannot be delivered for use.
6 Marking, packaging, transportation and storage
6.1 Product marking
6.1.1 The label should be fixed on a conspicuous part of the product, and the size and shape of the label should comply with the provisions of JB8. 6.1.2 The product label should include:
a. Product name;
b. Product model;
c. Main parameters of the product;
d. Date of manufacture;
e. Product number;
f. Production unit.
6.2 Product packaging
6.2.1 The packaging of the device should comply with the relevant provisions of JB2759 or be carried out according to the contract requirements, and the export packaging should comply with the provisions of GBn193. 6.2.2 The product should be accompanied by relevant documents such as packing list, installation and operation manual, and factory certificate of conformity. 6.3 Transportation and storage
6.3.1 The storage and transportation of products should comply with the relevant provisions of GB191. 6.3.2 When the temperature is below 0℃ during transportation, nitrogen must be used to drain the accumulated water in the device and seal all outlets. 6.3.3 The product should be stored in a corrosion-resistant place with a temperature of 5~45℃ and a relative humidity of less than 90%. A1 Principle Overview
CB3521-93
Appendix A
Gas Production Measurement by Volumetric Method
(Supplement)
According to the gas state equation in a closed container, the gas volume under the initial and final standard conditions is calculated respectively. The difference between the two is the gas production of the device during this period.
A2 Instruments
a. Pressure gauge: accuracy 0.4 grade;
b. Temperature gauge;wwW.bzxz.Net
c. Stopwatch.
A3 Gas Production Measurement by Gas Storage Tank
A3.1 The flow of the tank test system is shown in Figure A1. Gas inlet
Article 304①
Figure A1 Flow chart of tank test system
1- Vent valve; 2- Inlet valve;
3- Pressure gauge;
: 4- Temperature gauge;
A3.2 Determination method
A3.2.1 The volume of the storage tank should be measured before testing. The relative error of the volume shall not be greater than ±2%. Gas outlet
5-Gas outlet valve
A3.2.2 Test under the rated working conditions of the device. First, open valve 1 to vent the gas, close valve 2 and valve 5, and accurately record the pressure and temperature of the gas in the storage tank. Then open valve 2, close valve 1, and record the start time. After a certain period of time, open valve 1, close valve 2, and record the end time, pressure in the storage tank, and temperature. A3.2.3 Calculation method
The gas production is calculated according to formula (A1):
Wherein: Q
CB 3521-93
Gas volume under standard conditions, m2/h;
Gas temperature under standard conditions, 273K;
Tank volume, m2;
-Absolute pressure in the container at the end, MPa;
Absolute pressure in the container at the start, MPa;
Test time, h;
Gas pressure under standard conditions, 0.101325MPa;-Gas temperature in the container at the end, K;
-Gas temperature in the container at the start, K.
A4 Gas production measurement by bell-type gas cabinet
A4.1 The process of bell-type test system is shown in Figure A2. Air inlet
Air outlet
Bell-type gasholder
Figure A2 Flow chart of bell-type test system
2-Air inlet valve;
3-Air outlet valve;
1-Vent valve;
A4.2 Measurement method
4-Pressure gauge;
5-Temperature gauge;
Carry out measurement under the rated operating conditions of the device, open valve 1, close valve 2 and valve 3, accurately record the pressure and temperature of the gas in the gasholder and the gasholder scale reading, then open valve 2, close valve 1, record the starting time, after a certain period of time, close valve 2, open valve 1, record the end time, the pressure and temperature of the gas in the gasholder and the gasholder scale reading. A4.3. Calculation method
The gas production is calculated according to formula (A2):
Ty,P-VP
Wherein: V
-gas volume in the gas tank at the end, m;
-gas volume in the gas tank at the start, m\; V
T. —gas temperature under standard conditions, 273K; 6
·(A2)
CB3521-93
-absolute pressure in the container at the end, MPaP2
P, absolute pressure in the container at the start, MPa; test time, h;
Additional instructions:
gas pressure under standard conditions, 0.101325MPas; gas temperature in the container at the end, K;
-gas temperature in the container at the start, K.
This standard was proposed by the 603 Institute of China State Shipbuilding Corporation. This standard was drafted by the 718th Research Institute of the 7th Research Institute of China State Shipbuilding Corporation. The drafters of this standard are: Hong Xiaoming, Li Shufang, and Jiang Haifeng.
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