Solar-driven coal gasification methanol synthesis and zero-emission power generation combined system

Abstract

The invention discloses a solar-driven coal gasification methanol synthesis and zero-emission power generation combined system in the field of clean utilization of coals. The system mainly comprises asolar coal gasification sub-system, a methanol synthesis sub-system and a zero-emission power genration sub-system. The three sub-systems are connected with an oxygen compressor, a synthesis gas compressor and a combustor through an air separation unit and a purifying separation device, the three sub-systems are organically connected to form the combined system. In the system, condensed solar power provides energy for the coal gasification process, the produced synthesis gas is fed into a methanol synthesis reactor to synthesize methanol, purge gas from an outlet of the reactor is fed into the combustor, the purge gas and the oxyge generatged from the air separation unit are burnt, supercritical carbon dioxide is directly heated and driven to generate power, and a product of combustion can be separated from tail gas to achieve zero emission. Waste heat generated in the working process is recycled by heating a circulating working medium, generating steam and drying raw coal. The comprehensive utilizationrate of the energy source is improved, and it is achieved that graded utilization of the coal and clean power generation coordinatively develop.

Description

technical field [0001] The invention belongs to the field of clean utilization of coal, and in particular relates to a cogeneration system of solar-driven coal gasification methanol synthesis and zero-emission power generation, specifically a co-production system of solar-driven coal gasification and methanol synthesis and supercritical carbon dioxide zero-emission power generation integration production system. Background technique [0002] According to the annual data from the National Bureau of Statistics of the People's Republic of China, China's total energy production in 2018 was 3,770 million tons of standard coal, of which coal production accounted for 69% of the total, and the total energy consumption was 4,640 million tons of standard coal, of which the total coal consumption Accounting for 59%, it can be seen that China's current energy production and consumption structure is still dominated by coal. However, coal is directly burned as a fuel in power generation a...

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Problems solved by technology

After dehydration, high-concentration carbon dioxide can be easily separated from the carbon dioxide produced by combustion after being pressurized by compressors and pumps, without complicated carbon capture equipment, but this technology has the same problems in coal gasification as in methanol production from coal gasification

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