Hydrogen-electricity co-production system and method for coal-fired boiler

Abstract

According to the hydrogen-electricity co-production system and method for the coal-fired boiler, the coal-fired boiler, sulfur-iodine circulating hydrogen production and supercritical carbon dioxide power generation are coupled, and hydrogen-electricity co-production is carried out; comprising a coal-fired carbon dioxide boiler, a carbon dioxide power generation system, a high-temperature heat exchanger, a medium-temperature heat exchanger, a denitration module, a low-temperature heat exchanger, an air pre-heater, a dust remover, an induced draft fan, a biochemical reactor, a flue gas emission system, a separation system, a hydrogen iodide solution concentration and rectification system, a hydrogen iodide decomposition system, an iodine recovery system, a hydrogen storage system and a sulfuric acid storage system. An air supply system, an air powder system and a water supply system. According to the method, the iodine solution is used for absorbing sulfur dioxide in the boiler flue gas, no extra carbon dioxide emission is generated, iodine can be recycled, and the operation cost is low; the polluting gas sulfur dioxide generated by the boiler is used for producing hydrogen, so that the pollution is reduced, and the energy is increased; the supercritical carbon dioxide power generation work is in the highest efficiency temperature section, and the power generation efficiency is improved.

Description

Technical field [0001] The invention belongs to the technical fields of thermal power, environmental protection and hydrogen production, and specifically relates to a system and method for hydrogen and electricity cogeneration in a coal-fired boiler. Background technique [0002] The flue gas from coal-fired units contains sulfur dioxide. At present, most desulfurization is carried out by burning calcium carbonate into calcium oxide, grinding it into powder, and making a slurry. The flue gas containing sulfur dioxide passes through the slurry, and the sulfur dioxide is absorbed to produce calcium sulfate for desulfurization. . This desulfurization method releases the carbon dioxide solidified in the calcium carbonate, so the desulfurization process adds additional carbon emissions. In addition, the desulfurization process requires the continuous use of calcium carbonate, and the cost of raw materials is high. [0003] Supercritical carbon dioxide power generation is a popu...

AI Technical Summary

Problems solved by technology

However, sulfur-iodine cycle hydrogen production requires the use of a high-temperature heat source above 800°C in a highly corrosive environment, which is difficult in large-scale industrial applications.

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