Pressurizing and decompressing process for coal lock by utilizing byproduct carbon dioxide gas and coaling system

Abstract

The invention relates to a pressurizing and decompressing process for a coal lock by utilizing byproduct carbon dioxide gas and a coaling system. The coal lock pressurizing and decompressing method comprises the following steps of opening an upper conical valve of the coal lock, and closing a lower conical valve; charging the feed coal into the coal lock through a coal hopper, and closing the upper conical valve after the feed coal is charged; compressing and supercharging the carbon dioxide from a subsequent purification step through a compressor, and pressurizing the coal lock by utilizing the carbon dioxide after the upper conical valve is closed; opening the lower conical valve of the coal lock after the coal lock is pressurized to the pressure of a gasification furnace, and filling the feed coal into the gasification furnace through a transitional cabin; and closing the lower conical valve of the coal lock after the feed coal enters the gasification furnace, decompressing the coal lock through a pressurizing / primary decompressing pipe orifice on the upper part of the coal lock for the first time, and decompressing the coal lock through a secondary decompressing pipe orifice for the second time. The coaling system comprises a coal hopper, a coal lock, a transitional cabin and a gasification furnace, wherein the coal lock comprises an upper conical valve, a coal lock main body, a lower conical valve, a pressurizing / primary decompressing pipe orifice and a second decompressing pipe orifice.

Description

technical field [0001] The invention relates to a process for filling and releasing pressure of a coal lock in the field of coal gasification, in particular to a process for filling and releasing pressure of a coal lock by using carbon dioxide gas. The invention also relates to a coal charging system. Background technique [0002] In the prior art, the coal feeding systems of various pressurized fixed-bed gasifiers all use intermittently operated coal locks to intermittently feed coal into the gasifier, and the coal locks need to be frequently switched between normal pressure and pressure. The frequent opening of the upper and lower valves, the long time for depressurization and pressure filling, resulting in a long time-consuming coal feeding system, seriously affect the increase of gasifier load, feed continuity and performance stability. [0003] At present, in the coal feeding system of industrial application, when the gasifier device is in normal operation, the cold co...

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Problems solved by technology

[0010] In order to solve the defects of gas inflammability and explosion, large equipment investment, large area occupation and effective product gas loss in the existing gas filling and pressure relief technology, and to solve the problems of continuity, safety and stability of the coal feeding system, the present invention provides A process of filling and releasing the pressure of the coal lock by using the by-product carbon dioxide waste gas removed in the subsequent section to be pressurized by the compressor can realize the rational use of waste gas, reduce site occupation and equipment investment, and reduce maintenance costs. whole process

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