Underground coal gasification multi-combining production system and method

Abstract

The invention discloses a poly-generation system of underground coal gasification (UCG) and a method thereof. .The system comprises a UCG subsystem, a thermal value and component regulation subsystem and a chemical production system; the UCG subsystem is used for injecting gasification agent into a gasification tunnel after gasification fire so that the gasification agent conducts gasification reaction with a coal bed in the gasification tunnel to generate synthesis gas; crude synthesis gas is led into the thermal value and component regulation subsystem; the thermal value and component regulation subsystem is used for reintegrating the component and thermal value of the synthesis gas and sending the reintegrated synthesis gas into the chemical production system as feed gas; the chemical production system is used for producing chemical products by utilizing the synthesis gas sent by the thermal value and component regulation subsystem. By adopting the method and system provided by the invention, coal gasification poly-generation process can be completed under the condition of energy saving and environmental protection.

Description

technical field [0001] The invention relates to the field of coal gasification, in particular to an underground coal gasification polygeneration system and method. Background technique [0002] Coal accounts for 75% of the world's primary energy (coal, oil, natural gas, etc.) reserve structure and is the most abundant fossil fuel in the world. However, with the continuous increase of human demand for energy, the advancement of science and technology and the increasing consumption of major energy sources, coal will gradually receive due attention again due to its advantages of abundant reserves and low cost. However, the traditional coal mining, processing, and use methods lead to frequent coal safety accidents, massive CO2 emissions, severe damage to the environment on which human beings depend, and the comprehensive utilization rate of coal resources is very low. Therefore, the development of new coal chemical technology, changing the traditional way of coal mining and use...

AI Technical Summary

Problems solved by technology

[0008] At present, although underground coal gasification has proved the feasibility of technology and engineering, the existing underground coal gasification technology, no matter which technical model is not mature, the extended development technology and production equipment of underground gasification products in the existing technology Backward, most of the downstream products are designed in the stage of primary chemical raw materials, the product extension development is weak, the grade is low, the variety is small, the scale is small, and the competitiveness is low, which seriously affects the industrialization development of underground coal gasification

However, the current polygeneration process is mainly aimed at conventional gasification technology, and does not fully consider the characteristics of underground coal gasification that require partial dehydration of groundwater near the coal seam, unstable calorific value of gas production, and large burn-out areas after gasification.

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