Grading pressurization and depressurization method of pressure gasification furnace coal lock

Abstract

The invention belongs to the technical field of coal gasification, which discloses a grading pressurization and depressurization method of a pressure gasification furnace coal lock. The coal lock is provided with a gas pipeline; a plurality of sequencing valves are installed on the gas pipeline in parallel; one sequencing valve is arranged between the gas pipeline and a gasification furnace; the sequencing valve groups can be utilized to carry out grading pressurization and depressurization on the coal lock; gas for pressurization is the gas produced by depressurization, compressed gas can be reduced to the utmost, and gas can be compressed at higher pressure as much as possible so as to reduce compression work, thus obtaining the purpose of energy saving. The invention is suitable for parallel operation of multiple, dozens of and even hundreds of gasification furnaces.

Description

Technical field [0001] The invention belongs to the technical field of coal gasification, and in particular relates to a method for staged charging and decompression of coal locks in a pressurized gasifier. Background technique [0002] At present, in the field of pressurized coal gasification technology, all the other pressurized coal gasifiers are equipped with coal locks except for coal-water slurry gasifiers. Now take the crushed coal fixed bed pressurized gasifier as an example to illustrate the working process of the coal lock. The crushed coal fixed bed pressurized gasifier is composed of coal lock, ash lock and gasifier body. The coal lock is located in the gasifier body. On the upper part, the coal lock is equipped with valves up and down, and is equipped with a ray level gauge, which can indicate the level of coal in the coal lock. The coal lock regularly and quantitatively adds coal to the gasifier body through the upper and lower valves; the coal charging process is a...

AI Technical Summary

Problems solved by technology

A crushed coal fixed bed pressurized gasifier produces about 2000Nm per hour 3 For the left and right coal lock gas, some enterprises use torches to burn, which not only pollutes the environment, but also causes waste of resources; However, it consumes a lot of compression work, and because the amount of coal-lock gas fluctuates greatly and the washing is not clean, the coal-lock gas contains dust, which causes damage to compressor air valves, piston rings and other components.

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