System and method for producing hydrogen and methyl alcohol by utilizing residual electricity and residual heat of coal-fired generating unit

Abstract

The invention relates to a system and a method for producing hydrogen and methyl alcohol by utilizing residual electricity and residual heat of a coal-fired generating unit. The system comprises a boiler, a steam turbine and an electric generator, wherein the boiler produces water steam to drive the electric generator through the steam turbine to generate electricity. The system also comprises a water steam auxiliary electric heater, a high-temperature water steam electrolytic bath, a residual heat recovery device, a scavenging air auxiliary electric heater, a hydrogen compressor, a hydrogen heating device, a carbon dioxide collecting device, a carbon dioxide compressor, a carbon dioxide heating device and a methanol synthesis device. According to the method, a boiler main steam outlet is divided into two paths, wherein one path of steam enters the steam turbine for work to drive the electric generator to generate electricity; the other path of steam enters the water steam auxiliary electric heater so as to be heated to achieve the water steam electrolysis working temperature, and then enters the high-temperature water steam electrolytic bath to electrolyse; and a high-temperature hydrogen / water steam mixture is formed on an outlet at the cathode side of the electrolytic bath. The system and the method provided by the invention are reasonable in procedure, and efficiently utilize the residual electricity / the residual heat of the coal-fired generating unit to produce fuels such as the hydrogen and the methyl alcohol.

Description

technical field [0001] The invention relates to a clean energy preparation system, in particular to a system and a method for producing hydrogen and methanol by using surplus electricity / waste heat of a coal-fired generating set. Background technique [0002] At present, the large-scale and high-parameterization of coal-fired power generation units is the main way to reduce coal-fired pollution on a large scale. The domestically operated thermal power units are mainly 600MW and 1000MW supercritical (main steam temperature 538°C~593°C, main steam pressure 24 ~26MPa), ultra-supercritical (main steam temperature ≥ 600°C, main steam pressure ≥ 26MPa) coal-fired generating units, foreign main steam temperature 700C ° coal-fired generating units will also be put into operation soon. However, in recent years, due to the development of new energy sources such as hydropower, photovoltaics, and wind power in some areas, the operating load of a large number of large-capacity, high-para...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a method for generating hydrogen by utilizing the surplus electricity / waste heat of a large-capacity, high-parameter coal-fired generating set to electrolyze water or high temperature steam (High Temperature Steam Electrolysis, HTSE) , and through the carbon dioxide hydrogenation catalytic reaction (Carbon Dioxide by Catalytic Hydrogenation with Hydrogen, CDCHH) system to produce methanol to solve the problem of low efficiency and high cost of coal-fired generating units in power generation enterprises during part-load operation, and provide hydrogen, methanol, etc. to directly Blend natural gas, gasoline vehicles, and diesel vehicle fuels to reduce regional pollutant emissions and carbon emissions, and improve regional air quality

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