Two cases, understand ALK electrolysis of water to produce hydrogen
Time：2022/5/27 16:20:03 Tag：hydrogen, case,ALK electrolysis
Hydrogen is produced by electrolysis of water
It is a clean, efficient and sustainable hydrogen production technology
Its hydrogen production technology is mature and hydrogen purity is high
In order to alleviate the greenhouse effect, accelerate the energy green transformation
Domestic is building a batch of scale
Wind farms, solar photovoltaic plants...
▲ Wind power Project
In these large-scale renewable energy generation projects
Hydrogen production from water electrolysis is one of the mature technologies with potential
Especially ALK electrolysis water production technology
Safe and reliable, long service life, good economic performance
It is also suitable for renewable power plants
Supporting large-scale hydrogen energy projects
Compared with PEM qualification exchange membrane electrolytic water hydrogen production and solid oxide electrolytic water hydrogen production, ALK electrolytic water hydrogen production technology is mature, in the market has more application examples, strong reliability.
The following two cases are used to understand ALK electrolysis of water to produce hydrogen.
| 01 Application in traditional power plant
Taking a 2*660MW coal-fired power plant as an example, the configuration scheme of hydrogen production equipment is calculated according to the basic data and the provisions of the Chemical Design Code for Power Plants.
Scheme 1:1 set of 10Nm³ electrolytic water hydrogen production system
The electrolytic water hydrogen production station covers a total area of about 33m×37m, surrounded by a physical wall of no less than 2.5m, which is divided into electrolytic water hydrogen production workshop and storage tank area.
Among them, the electrolytic water hydrogen production workshop includes electrolytic room, auxiliary room, compression room, distribution room and control room.
(1) Electrolytic room: electrolytic cell, hydrogen separator, oxygen separator, hydrogen scrubber, oxygen scrubber, hydrogen cooler, oxygen cooler, hydrogen water separator, oxygen water separator, hydrogen drainer, oxygen drainer, deoxygenation dryer/purifier, alkali circulating pump, alkali cooler, alkali filter, etc., 1 set of nitrogen bottle group.
(2) Auxiliary room: lye tank, water refill tank, water refill pump, etc.
(3) Compression room: a hydrogen compressor with a flow rate of 10Nm³/h and an outlet pressure of 3.2mpa, a hydrogen buffer tank, a hydrogen distribution plate with an inlet pressure of 3.2mpa and an outlet pressure of 0.8mpa, etc.
(4) Distribution room: distribution cabinet and rectifier cabinet are configured.
(5) Control room: hydrogen production control cabinet, DCS control cabinet.
(6) Outdoor storage tank area: 4 hydrogen storage tanks with a standard water volume of 13.9m³ and hydrogen filling pressure of 3.2mpa, and 1 compressed air storage tank for pneumatic valves.
The distance between the electrolytic water hydrogen production workshop and the storage tank area is 16m, meeting the safety distance required by the specification.
"Hydrogen homemade" of the power plant can continuously provide reliable hydrogen that meets the requirements of purity, humidity and consumption of the hydrogen-cooled generator of the power plant, regardless of the availability of reliable and qualified external hydrogen purchase.
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| 02 Design in renewable energy generation projects
Take a 300MW wind power generation/solar power plant as an example: Based on the basic data, the hydrogen production equipment configuration scheme is calculated as follows.
Scheme 2:6 sets of 1000Nm³ electrolytic water hydrogen production system
The electrolysis hydrogen production station covers a total area of about 129m×103m and is surrounded by a physical wall of no less than 2.5m, which is divided into electrolysis hydrogen production workshop and long tube trailer charging station.
Electrolytic water hydrogen production workshop: including electrolytic room, auxiliary room, compression room, nitrogen cylinder room, desalinization preparation room, air compressor room, transformer room, rectifier cabinet room and control room.
(1) Electrolytic chamber: Six sets of 1000 nm after/h water electrolysis hydrogen production device and accessory equipment, each including electrolytic cell, hydrogen, oxygen, hydrogen separator separator scrubber scrubber, oxygen, hydrogen, oxygen, hydrogen cooler water cooler separator oxygen, hydrogen, oxygen and water separator drainage, drainage device, deoxidization dry/clarifier, lye circulating pump, lye cooler, lye filters, etc.
(2) Auxiliary room: each 2 sets of hydrogen production devices share 1 set of auxiliary equipment, each set of auxiliary equipment includes lye tank, desalting water refill tank, water refill pump, etc.
(3) Compression room: 7 hydrogen compressors with flow rate of 1000Nm³/h and outlet pressure of 20MPa, 6 for use and 1 for standby; Equipped with 2 hydrogen buffer tanks.
(4) Nitrogen bottle room: 3 sets of nitrogen bottle group, each 2 sets of hydrogen producing device shares 1 set of nitrogen bottle group.
(5) Desalinization preparation room: 3 sets of desalinization preparation devices with output capacity of 4t/h, 2 for use and 1 for standby; And a 100m³ desalting water tank is equipped to meet the requirement of desalting water for 12 hours of continuous operation of hydrogen production equipment.
(6) Air compressor room: 1 set of compressed air preparation and storage devices for pneumatic valves, including 2 air compressors, 1 set of filtration and purification devices and 2 sets of compressed air storage tanks.
(7) Transformer room: transformer.
(8) Rectifier cabinet: rectifier cabinet.
(9) Control room: Hydrogen production control cabinet and DCS control cabinet are arranged in.
Long tube trailer loading station: The long tube trailer loading station is an open building with a ceiling above.
It is equipped with 15 hydrogen torpedo storage tanks with a standard water volume of 37 m³ and a hydrogen charging pressure of 20MPa, and 3 dedicated torpedo storage tank long tube trailers, which are used to transport high-pressure hydrogen to various hydrogen stations and hydrogen users.
The distance between the water electrolysis hydrogen production workshop and the long tube trailer loading station is 40m, which meets the safety distance required by the specification.
Electrolytic water hydrogen production can be used in conjunction with centralized photovoltaic/wind power plants to reduce the impact of renewable energy fluctuations on the power grid and facilitate large-scale consumption of renewable energy.
| 03 Write in the last
At present, the development of electrolytic water hydrogen production technology to improve energy consumption, stability and other performance as the main goal, in order to improve the matching with renewable energy, reduce the cost of hydrogen, for electrolytic water hydrogen production lay a foundation for the promotion and application.
References:
{1}李鹏 肖建群《电解水制氢在电厂和氢能项目的设计应用》南方能源建设2020,7(2)41-45
2}丛琳 王楠 李志远 李娜 周喜超 《电解水制氢储能技术现状与展望》电器与能效管理技术2021,8(20)1-7,28