Waste heat utilization system for hydrogen production by electrolytic water and working method of waste heat utilization system

Abstract

The invention discloses a waste heat utilization system for hydrogen production by electrolytic water and a working method of the waste heat utilization system, and belongs to the technical field of hydrogen production by the electrolytic water. The waste heat utilization system comprises an electrolytic water system for the hydrogen production, a membrane distillation system, a heat user heatingsystem and a circulating cooling system. Waste heat generated in the process of the hydrogen production by the electrolytic water is used as a heat source in the membrane distillation process to prepare water supplement of the electrolytic water system for the hydrogen production, and the heating energy consumption in the membrane distillation process is saved. Compared with a traditional water preparation system, the energy consumption of water preparation of the membrane distillation system is low. Through the waste heat gradient utilization mode, waste heat still exists in circulating waterused for heating membrane distillation raw water, the waste heat can be used for winter heating for heat users such as electrolytic hydrogen production workshop or a container, the temperature requirement of the hydrogen production system in the space is met, and through the gradient utilization of the waste heat, the energy utilization efficiency of the whole electrolytic hydrogen production system is improved. The waste heat utilization system is reasonable in design, gradient and comprehensive utilization is carried out on the waste heat of the electrolytic water, the energy transferring efficiency is improved, and good application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by electrolysis of water, and in particular relates to a waste heat utilization system for hydrogen production by electrolysis of water and a working method thereof. Background technique [0002] Hydrogen energy is a green and efficient secondary energy source, which has broad application prospects in transportation, electricity, fuel and other fields. With the large-scale development of renewable energy such as wind power and photovoltaics, the use of renewable energy to electrolyze water to produce hydrogen provides a green, low-carbon, low-cost, and sustainable production method for hydrogen energy. However, compared with traditional fossil raw material hydrogen production such as coal gasification hydrogen production and natural gas reforming hydrogen production, the cost of hydrogen production by electrolysis of water is relatively high, mainly due to the large power consumption. ...

AI Technical Summary

Problems solved by technology

However, compared with traditional hydrogen production from fossil raw materials such as coal gasification hydrogen production and natural gas reforming hydrogen production, the cost of hydrogen production by electrolysis of water is still relatively high, mainly due to the large power consumption

In the process of electrolyzing water to produce hydrogen, in addition to generating hydrogen and oxygen through the catalysis of the electrodes, due to the resistance of the electrodes, electrolyte, and diaphragm, the thermal effect of the current will gradually increase the temperature of the electrolyte. In order to control the electrolysis temperature at Within a certain range (60-100°C), it is usually necessary to circulate and cool the electrolyte, so a part of heat energy will be lost and the overall conversion efficiency of electric energy will decrease

In order to improve the electrical energy conversion efficiency of hydrogen production by electrolysis of water, the hot spot of current technology development is to improve the catalytic activity of the electrode to achieve the purpose of improving the conversion efficiency of electricity to hydrogen. However, due to factors such as catalyst cost, service life, and industrial scale-up, some High-performance catalysts are still difficult to achieve industrial applications

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