GB/T 19774-2005Specification of water electrolyte system for producing hydrogen (English PDF)

3.1 Normal condition

The gas condition, that the temperature is 0 °C and the pressure is 101.3 kPa.

3.2 Diaphragm

The electrolytic cell of the water electrolyzer is divided into a cathode area and an anode area, the generated hydrogen and oxygen are separated, to prevent the hydrogen and oxygen from penetrating each other, but the ions can migrate.

3.3 Lower explosive limit

The minimum concentration of an explosive gas mixture, which is formed by the flammable and explosive gas, vapor or dust, in air/oxygen.

3.4 Upper explosive limit

The maximum concentration of an explosive gas mixture, which is formed by the flammable and explosive gas, vapor or dust, in air/oxygen.

3.5 Fire arrester

The function of the fire arrester is to prevent the external flame from breaking into the equipment and pipelines, which contain flammable and explosive gases, OR to prevent the flame from spreading between the equipment and pipelines. The fire arrester is designed and manufactured on the principle that, when the flame passes through the narrow pores of the thermal conductor, it is extinguished due to heat loss. workshop. If it is installed and used outdoors, it shall be provided with protection facilities, to prevent s

4.1 Classification

The products of the water electrolysis hydrogen production system are divided into ordinary type and pure gas type, according to the purity. Their purity range is stipulated as follows. […]

4.2 Product naming

The product name of the water electrolysis hydrogen production system shall consist of uppercase Chinese pinyin letters and Arabic numerals.

5.1 Water electrolysis hydrogen production system

5.1.1 General requirements

5.1.3 Working conditions

5.1.3.1 The working pressure (p) of the water electrolysis hydrogen production system is divided into three categories. Normal pressure, low pressure, medium pressure. Their pressure ranges are specified as follows.

5.1.3.6 When caustic alkaline aqueous solution is used in the water electrolysis hydrogen production system, the potassium hydroxide or sodium hydroxide used shall comply with the provisions of GB/T 2306 and GB/T 629.

5.2 Single equipment

5.2.1 General requirements

5.2.1.1 For the water electrolysis hydrogen production system, different single equipment shall be reasonably configured, according to the different requirements of scale of the water electrolysis hydrogen production system, the characteristics of hydrogen used, the hydrogen quality.

5.2.2 Electrolyzer

5.2.2.1 The water electrolyzer is the main equipment of the water electrolysis hydrogen production system. Its performance parameters will determine the technical performance of water electrolysis hydrogen production.

5.2.7 Pressure regulator/valve

5.2.7.1 The pressure regulator/valve is used for the pressure balance of the hydrogen side and the oxygen side, at the water electrolyzer outlet, OR the pressure regulation of the hydrogen/oxygen, which is supplied outside the water electrolysis hydrogen production system.

5.2.8 Hydrogen cut-off valve/shut-off valve

5.2.8.1 According to the requirements of air flow cut-off, analysis, test, blow-off replacement, in the production process of the water electrolysis hydrogen production system, a cut-off valve/shut-off valve shall be set at the relevant position.

5.2.9 Fire arrester

5.2.9.1 A fire arrester shall be installed, in front of the hydrogen exhaust port of the water electrolysis hydrogen production system, to prevent the return of external fire sources, such as lightning strikes, AND cause the hydrogen to catch fire.

5.3 Pipelines and accessories

5.3.1 Material selection

The material selection of the pipelines and accessories of the water electrolysis hydrogen production system shall comply with the provisions of GB 50177, GB 50316, GB 50235.

5.3.2 Arrangement of pipelines and accessories

5.3.2.1 Meet the requirements of the process flow diagram of the water electrolysis hydrogen production system, which has control points.

5.3.2.2 It shall be convenient for operation, installation, maintenance.

6.1 Test

6.1.1 Preparation before the test

6.1.2 Test method

6.1.2.1 Air tightness test, carry out the air tightness test on the pressure type water electrolysis hydrogen production system, by the use of clean air or nitrogen. The air tightness test pressure is the design pressure. After the test starts, the pressure is gradually increased.

6.1.2.3 Hydrogen compressors, pumps and other movement equipment shall be subject to test run, under load according to relevant standards.

6.1.2.4 For pressure vessels such as pressure-type hydrogen tanks, welding quality inspection and strength test shall be carried out, in accordance with the "Regulations on safety technical supervision of pressure vessel" and design drawings; a certificate shall be issued by a qualified testing department.

6.1.2.5 Shell ventilation test […]

6.2 Detection

6.2.1 Preparation before detection

6.2.1.1 The hydrogen pipeline of the water electrolysis hydrogen production system shall be subject to purging-replacement; the oxygen content in the system shall be less than 0.5%, after purging-replacement.

6.2.1.2 The raw material water, electrolyte, power supply, automatic control system of the whole system shall meet the design requirements and reach the conditions for start-up.

6.2.2 Detection of performance parameter

6.2.2.1 Detection of hydrogen output

6.2.2.1.1 Hydrogen output detection methods of water electrolysis hydrogen production system include volume method and DC current test value calculation method. This standard recommends using the DC current test value calculation method.

6.2.2.1.2 See Appendix A, for the calculation of the DC current test value; see Appendix B, for the volume method.

6.2.2.2 Detection of hydrogen/oxygen purity

6.2.2.3 Detection of DC voltage and current

6.2.2.3.1 The total DC current (cell current) of the water electrolyzer is detected by a DC ammeter. The accuracy level of the ammeter is not less than level 0.5.

6.2.2.4 Electric consumption per unit of hydrogen production

6.2.3 Detection requirements

6.2.3.1 The items, requirements and qualification criteria to be detected at the user's site shall be clearly specified in the supply contract AND used as the basis for equipment acceptance.

6.2.3.2 The manufacturer shall provide the equipment users with the following detection records, data, reports.

6.2.3.3 The detection instruments, meters, all related materials shall comply with the relevant standards or the provisions of the contract. The detection instruments and meters shall be within the valid certification time limit.

7.1 General requirements

7.1.1 The marking and installation location of the water electrolysis hydrogen production system and its single equipment shall comply with the provisions of GB/T 13306.

7.2 Contents of signboards

7.2.1 The signboard of the mobile water electrolysis hydrogen production system shall include the following contents.

7.2.1.1 The name and address of the manufacturer.

7.2.1.2 The product model and trademark.

7.2.1.3 The date of manufacture and serial number.

7.2.2 The signboard of the water electrolyzer shall include the following contents.

7.2.2.1 The name and address of the manufacturer.

7.2.1.4 Main technical parameters

7.3 Illustration of packing box

The pictorial signs for storage and transportation of the packing box shall comply with the provisions of GB/T 191.

8.2 System and equipment drawings

8.2.1 The manufacturer shall provide various system processes, equipment structure, electrical automatic control drawings, which are required for the installation, operation, maintenance of the water electrolysis hydrogen production system.

8.3 User manual

8.3.1 The manufacturer shall provide instructional requirements or instructions for start-up and shutdown procedures.

8.3.2 Tips for safe use instructions shall generally include the following contents.

8.3.2.1 Reminders about explosion-proof, leak-proof, safe operation in the environment of hydrogen production.

8.3.2.2 Electrolyte preparation, anti-leakage, safety protection measures

8.4 Installation and maintenance manual

8.4.1 The manufacturer shall provide requirements and guidelines for installation and maintenance. It includes that the site layout and design of the water electrolysis hydrogen production system must follow the provisions of GB 50177; the use of hydrogen must follow the provisions of GB 4962.

8.4.2 The installation and maintenance manual shall mainly include the following contents. […]