Thermal management adjusting system for hydrogen production by alkaline electrolysis water and adjusting method of thermal management adjusting system

Abstract

The invention belongs to the related technical field of electrolytic hydrogen production, and discloses a thermal management adjusting system for alkaline water electrolysis hydrogen production and an adjusting method thereof.The system comprises an alkaline water electrolysis hydrogen production subsystem and an absorption heat pump subsystem, and the absorption heat pump subsystem comprises a generator and an evaporator; the alkaline water electrolysis hydrogen production subsystem comprises an electrolytic bath, a regenerative heat exchanger and a gas-liquid separation device, a hydrogen output branch and an oxygen output branch of the electrolytic bath are input into the regenerative heat exchanger for heat exchange after being subjected to heat exchange through a generator and an evaporator respectively, and are input into the gas-liquid separation device for gas-liquid separation after being subjected to heat exchange through the regenerative heat exchanger; a liquid output pipeline of the gas-liquid separation device is divided into a first branch and a second branch, the first branch penetrates through the backheating heat exchanger, the first branch is converged with the second branch after heat exchange, and the liquid is input into the electrolytic bath after convergence. The low-grade energy output by the electrolytic cell can be utilized, meanwhile, the alkali liquor input by the electrolytic cell is heated, and then the normal working temperature of the electrolytic cell can be maintained without an external heat source.

Description

technical field [0001] The invention belongs to the technical field related to hydrogen production by alkaline electrolysis water, and more particularly, relates to a thermal management regulation system for hydrogen production by alkaline electrolysis water and a regulation method thereof. Background technique [0002] In recent years, renewable energy power generation technology has shown great development potential. The method of using surplus power to produce hydrogen by electrolysis has become an important way to reduce the energy consumption of electrolytic hydrogen production and improve the comprehensive utilization rate of power generation. Randomness, its power generation often has a large fluctuation. For the most economical and mature alkaline water electrolysis hydrogen production technology on the market, the hydrogen production efficiency of the electrolysis process can reach 60% to 75%, of which nearly 30% of the electrical energy is still converted into heat...

AI Technical Summary

Problems solved by technology

The working temperature of the electrolytic cell is generally between 80 and 90 °C, but during the operation of low power generation, the electrolytic power is only 20% or lower of the normal operation, the external heat dissipation of the electrolytic cell is greater than the heat produced by electrolysis, and the cell temperature drops significantly. The operating temperature of the electrolyzer cannot reach the optimum working temperature range of the electrolysis reaction, resulting in a decrease in the reaction rate of water electrolysis and a decrease in electrolysis efficiency. This characteristic limits the development space of renewable energy power generation coupled with alkaline electrolysis of water for hydrogen production to a certain extent.

[0003] Chinese patent CN113137783A discloses a system and method for recovering waste heat from electrolyzed water for hydrogen production by using a heat pump. It discloses a method for separately recovering the waste heat of the electrolysis product gas and the electrolytic solution by using an absorption heat pump, which can realize the recovery of the waste heat of the alkaline electrolyzer Recycling; Chinese patents CN215062987 and CN113137783 disclose a system that uses heat pumps to recover waste heat from electrolyzed water for hydrogen production, but its adjustment ability is poor, and adaptive regulation cannot be performed according to load changes; The heat treatment system discloses a comprehensive heat treatment system combining an electrolytic cell, a heat storage pool, a boiler system and heating equipment, and the heat storage pool can recover the waste heat of the electrolytic cell and keep the hydrogen production device warm

At present, there are still few scientific studies on the heat production management of the reaction process of hydrogen production by alkaline electrolysis of water, and the temperature regulation of the electrolyzer under low electric power operation. Some limitations, related comprehensive thermal management methods have yet to be explored

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