Coal gasification process and device for liquid slagging and high-temperature coke loopback

Abstract

The invention discloses a coal gasification process and device for liquid slagging and high-temperature coke loopback. The device comprises a U-shaped gas generator and a high-temperature separator, wherein the U-shaped gas generator comprises a high-temperature section and a low-temperature section which are of a U shape; the high-temperature section and the low-temperature section share a ash bucket; an outlet of the U-shaped gas generator is formed in the top of the low-temperature section and connected with an inlet of the high-temperature separator; a coal powder inlet, an air inlet and afirst vapor inlet are formed in the top of the high-temperature section; the coal powder inlet is connected with each of a coal powder source and a high-temperature coke outlet of the high-temperature separator; a second vapor inlet is formed in the middle part of the high-temperature section; a coal powder feeding port and a third vapor inlet are formed in the bottom of the low-temperature section; the third vapor inlet is located above the coal powder feeding port; the coal powder feeding port is connected with a coal powder pipeline; and the coal powder pipeline is provided with a gas pipeline. Through the adoption of the device, a carbon conversion rate can be provided and the efficient utilization of coal can be realized.

Description

technical field [0001] The invention belongs to the technical field of coal gasification, and in particular relates to a coal gasification process and device for liquid slag discharge and high-temperature coke return. Background technique [0002] my country's energy structure determines the status of coal as the main energy source, because coal combustion will produce SO 2 , NO x , dioxins, heavy metals, dust and other pollutants, with the increasingly prominent environmental problems, the efficient and clean utilization of coal has become a hot spot of social concern, and coal gasification, as the core technology to realize the efficient and clean utilization of coal, has developed rapidly in recent years. The applicant proposed in the application number 201711041111.7 "a pulverized coal gasification device and process for producing high-calorific-value gas with low residual carbon content" that a U-shaped two-stage gas generator can greatly increase the coal gasification...

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Problems solved by technology

The applicant proposed in the application number 201711041111.7 "a pulverized coal gasification device and process for producing high-calorific-value gas with low residual carbon content" that a U-shaped two-stage gas generator can greatly increase the coal gasification rate while producing high-calorific-value gas. utilization rate, but there are still the following problems: (1) the solid-state slag discharge method is adopted, and the bottom slag contains high carbon content, which affects the overall carbon conversion rate; (2) some oxygen is introduced into the low-temperature section, which reduces the heat of the pyrolysis gas to a certain extent. (3) The efficiency of the separator is that a large amount of semi-coke is still brought out at the outlet, which affects the carbon conversion rate and reduces the gasification efficiency

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