System and method for coproducing hydrogen and heat through water electrolysis on basis of integrated renewable energy sources

Abstract

The invention provides a system and method for coproducing hydrogen and heat through water electrolysis on the basis of integrated renewable energy sources. The system comprises a renewable energy source power supply subsystem, a water electrolysis hydrogen production subsystem, a hydrogen production waste heat recycling subsystem, a new electrolysis water preheating subsystem, a regional heat supply network subsystem and a monitoring and dispatching subsystem. According to the invention, power is supplied by renewable energy sources; a storage battery stores off-peak electricity of the state grid and redundant renewable energy source electric quantity; power is supplied to a factory for hydrogen production via water electrolysis through the micro-grid; waste heat generated by gas and an electrolyte in an electrolysis process is recycled to a buried heat storage device; and hot water of a water return network is preheated through the buried heat storage device, and further heating is achieved through a gas turbine, so regional heating is achieved; and through recycling of waste heat of hydrogen production and cross-seasonal heat storage, hydrogen-heat co-production based on water electrolysis is achieved, the energy utilization efficiency of the hydrogen production factory is improved, and good application prospects are achieved.

Description

technical field [0001] The invention belongs to the field of water electrolysis hydrogen production, and in particular relates to a water electrolysis hydrogen thermal cogeneration system and method for comprehensive renewable energy. Background technique [0002] In the context of the goal of carbon neutrality, efficient production and utilization of zero-carbon "green hydrogen" has become an important way to reduce carbon emissions. Compared with coal gasification hydrogen production, natural gas reforming hydrogen production and other technologies, water electrolysis hydrogen production has the characteristics of clean and pollution-free, so it has received more and more attention. The main factors restricting the commercialization and large-scale development of hydrogen production from water are the low efficiency and high cost of hydrogen production. During the hydrogen production process, the generated hydrogen and oxygen have a certain amount of heat and need to be c...

AI Technical Summary

Problems solved by technology

The main factors restricting the commercialization and large-scale development of hydrogen production from water are the low efficiency and high cost of hydrogen production

In the process of hydrogen production, the generated hydrogen and oxygen have a certain amount of heat and need to be cooled, resulting in a waste of energy

At the same time, more than half of the electric energy is dissipated into the electrolyte in the form of heat energy, resulting in an increase in the temperature of the electrolyte and a waste of energy.

An increase in the temperature of the electrolyte will further reduce the efficiency of hydrogen production, so how to ensure that the temperature of the electrolyte is in a suitable working range and make full use of the excess heat is one of the key means to improve the efficiency of hydrogen production

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