Coal pyrolysis and gasification polygeneration process based on circulating fluidized bed and coal pyrolysis and gasification polygeneration system based on circulating fluidized bed

Abstract

The invention provides a coal pyrolysis and gasification polygeneration process based on a circulating fluidized bed and a coal pyrolysis and gasification polygeneration system based on a circulating fluidized bed. The process comprises the following steps: sequentially carrying out pyrolysis, gasification and combustion processes on high volatile coal from the reactivity of coal; feeding low-value powdered semicoke or powdered active semicoke which is generated by granular crushing in the pyrolysis or gasification process; finally preparing active semicoke by using high-value granular semicoke and using the active semicoke in the field of an adsorbent and a catalyst and the like; and directly feeding low volatile coal, coal gangues and fault coal into the circulating fluidized bed to combust. High-quality and inferior coal resources are reasonably utilized for graded conversion and utilization, so that the resource and environmental problems are better solved. The process is a coal graded utilization process which combines pyrolysis, gasification and combustion, thereby achieving joint production of heat, electricity, tar, coal gas and active carbon.

Description

technical field [0001] The invention relates to the field of coal pyrolysis, in particular to a coal pyrolysis gasification polygeneration process and system based on a circulating fluidized bed. Background technique [0002] my country is rich in coal resources. In 2012, my country's coal output reached 3.6 billion tons, of which about 80% was used for direct combustion. Direct combustion of coal has problems such as low combustion efficiency and serious pollution. Therefore, new technologies for efficient comprehensive utilization of coal and low pollution emissions are developed imminent. Contents of the invention [0003] The invention provides a coal pyrolysis gasification polygeneration process based on a circulating fluidized bed, which is a coal classification utilization process combining pyrolysis, gasification and combustion, and can realize heat, electricity, tar, gas and active coke joint production. [0004] It is another object of the invention to provide a...

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Problems solved by technology

[0002] my country is rich in coal resources. In 2012, my country's coal output reached 3.6 billion tons, of which about 80% was used for direct combustion. Direct combustion of coal has problems such as low combustion efficiency and serious pollution. Therefore, new technologies for efficient comprehensive utilization of coal and low pollution emissions are developed imminent

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