Solar energy utilization system and method based on coal gasification

Abstract

The invention discloses a solar energy utilization system and method based on coal gasification, wherein the system comprises a heat collector, a gasifier, a carbon dioxide separation system, a gas turbine power generation system and a compressor; an outlet of the heat collector is connected with a carbon dioxide inlet of the gasifier; the gasifier is provided with an oxygen inlet, a steam inlet,a coal inlet and an ash slag outlet; an outlet of the gasifier is connected with an inlet of the carbon dioxide separation system, a coal gas outlet of the carbon dioxide separation system is connected with an inlet of the gas turbine power generation system, a carbon dioxide outlet of the carbon dioxide separation system is connected with an inlet of the compressor, a flue gas outlet of the gas turbine power generation system is connected with an inlet of the flue gas cooling separation system, a carbon dioxide outlet of the flue gas cooling separation system is connected with a shunting device, an outlet of the shunting device is connected with the inlet of the compressor, and an outlet of the compressor is connected with an inlet of the heat collector. The system can realize organic combination of coal gasification and solar energy utilization.

Description

technical field [0001] The invention belongs to the field of solar energy utilization, and relates to a coal gasification-based solar energy utilization system and method. Background technique [0002] Coal gasification is a process of converting the combustible part of coal into gas fuel through chemical reaction under high temperature conditions with coal as raw material and oxygen, air, water vapor, etc. as gasification medium. The coal gasification process is the basis of coal chemical industry, IGCC, coal indirect liquefaction, etc. The gasification process greatly affects the cost and efficiency of coal chemical products. Most of the existing gasification processes are autothermal gasification, that is, there is no external heat supply during the gasification process, and the heat consumed by the endothermic reaction of coal and water vapor is provided by the exothermic reaction of coal and oxygen. , so there is a considerable amount of carbon dioxide in the gas. In ...

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Problems solved by technology

[0004] In Northwest China, solar energy resources are abundant, coal resources are abundant, but water resources are in short supply. Therefore, if a new system can be developed that can organically combine carbon dioxide coal gasification and solar energy utilization, it will be beneficial to the traditional Coal gasification and solar energy utilization and utilization bring about huge changes

However, in the currently published reports, carbon dioxide coal gasification and solar energy utilization mostly appear alone, such as Chinese patent CN 102899090 A introducing a method for using carbon dioxide as a gasifying agent in a fixed-bed gasifier, and Chinese patent CN 103468320 A introducing a A carbon dioxide coal slurry preparation and gasification system, Chinese patent CN 103245087 A introduces an indirect medium-temperature solar thermochemical energy storage device based on chemical looping combustion, and Chinese patent CN 102721312 A introduces a solar thermochemical hybrid energy storage device and method, there is no report on the combination of coal gasification and solar energy utilization

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