Hydrogen-electricity co-production system and method for coal-fired boiler
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A technology for coal-fired boilers and power generation systems, applied in combustion methods, chemical instruments and methods, separation methods, etc., can solve problems such as difficulty, and achieve the effects of reducing pollution, improving power generation efficiency, and simplifying the system
Active Publication Date: 2022-06-24
XIAN THERMAL POWER RES INST CO LTD
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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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[0057] The invention is used to build a carbon dioxide coal-fired boiler generator set that can generate 750MW of heat, and the boiler burns coal with a sulfur content of 0.8%. The unit does not need circulating water system, condensate water system, water supply system, deaerator system, high and low pressure heater system, main steam system, demineralized water system, the system is greatly simplified, and the investment cost can be greatly reduced.
[0058] The temperature of carbon dioxide can reach 620℃, the pressure can reach 28MPa, and the carbon dioxide turbine can be turned to generate 350MW of electricity;
[0059] The air required for boiler combustion is used to cool the carbon dioxide after the carbon dioxide turbine does work, and the carbon dioxide temperature can be cooled to a temperature close to the critical temperature. The carbon dioxide power generation system does not require additional cooling sources, which improves the heat utilization efficiency;
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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 in particular relates to a system and method for co-generation of hydrogen and electricity in a coal-fired boiler. Background technique [0002] The flue gas of coal-fired units contains sulfur dioxide. At present, most of the calcium carbonate is calcined into calcium oxide, ground into powder, and made into a slurry, so that 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 continuous use of calcium carbonate, and the cost of raw materials is relatively high. [0003] Supercritical carbon dioxide power generation is a relatively ...
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