Comprehensive thermal management system of large alkaline water electrolysis hydrogen production device

Abstract

The invention relates to a comprehensive heat management system of a large alkaline water electrolysis hydrogen production device. The system comprises an alkaline water electrolysis hydrogen production device and a heat management device, wherein the alkaline water electrolysis hydrogen production device comprises an electrolytic cell and a gas-liquid separator, the alkali liquor output end of the gas-liquid separator is connected to the electrolytic bath through an alkali liquor circulation loop; the thermal management device comprises a thermal management comprehensive heat exchanger, a gas-liquid separation heat exchanger and an alkali liquor circulation heat exchanger; the gas-liquid separation heat exchanger is arranged between the electrolytic cell and the gas-liquid separator; thealkali liquor circulating heat exchanger is arranged in the alkali liquor circulating loop; heat exchange medium inlets and outlets of the gas-liquid separation heat exchanger and the heat managementcomprehensive heat exchanger are communicated to form a first heat exchange loop for cooling gas-liquid mixed-state alkali liquor output by the electrolytic bath; and heat exchange medium inlets and outlets of the alkali liquor circulating heat exchanger and the heat management comprehensive heat exchanger are communicated to form a second heat exchange loop for heating alkali liquor input into the electrolytic bath. Compared with the prior art, the comprehensive heat management system is capable of achieving effective comprehensive utilization of heat energy and great adaptability.

Description

technical field [0001] The invention relates to the technical field of hydrogen production by alkaline electrolysis of water, in particular to a comprehensive thermal management system of a large-scale hydrogen production device by alkaline electrolysis of water. Background technique [0002] The source of hydrogen is an important issue in the development of hydrogen energy at present. Hydrogen is still used as an industrial raw material gas and has abundant applications in the chemical industry. In terms of sources, there are mainly three mature technical routes; one is hydrogen production by reforming fossil energy ; The second is industrial by-product hydrogen; the third is electrolysis of water to produce hydrogen. The main raw material for hydrogen production by reforming fossil energy is coal. The cost is low and the technology is mature. However, the carbon dioxide emissions that cannot be eliminated and the use of fossil energy limit the large-scale green hydrogen pr...

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Problems solved by technology

Not only did not consider the comprehensive utilization of waste heat from electrolytic hydrogen production, but the overall thermal efficiency of the electrolytic cell cannot be higher than its hydrogen production efficiency, nor did it consider the thermal management technical requirements of the electrolytic cell under the operating conditions of wide power fluctuations. The long-term operation of the hydrogen system under low power load (such as 20% of the rated power) corresponds to the coupled electrolytic hydrogen production system applied to the renewable energy power system with large fluctuations and outstanding intermittency. The traditional alkaline electrolytic hydrogen production device The heat pipe system is not only poor adaptability, but also low efficiency

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