Entrained-flow bed coal gasification flashing noncondensable gas purification system and method

Abstract

The invention belongs to the technical field of coal gasification of entrained-flow beds, and provides an entrained-flow bed coal gasification flashing noncondensable gas absorption and purification system and method in order to improve the environment, purify and treat noncondensable gas in the production and operation processes of coal gasification of an entrained-flow bed, and prevent environmental pollution. A vacuum flashing separation tank is connected with an absorption device through a vacuum pump; the bottom of the vacuum flashing separation tank is connected with a subsider, and thetop of the vacuum flashing separation tank is connected with the vacuum pump; the other end of the vacuum pump is connected with the absorption device; as for the absorption device, the bottom of an absorption tank is connected with the subsider, a level meter is mounted on the side wall of the lower part of the absorption tank, the top of the absorption tank is provided with a desalted water inlet, a caustic soda flake adding opening and a noncondensable gas inlet, and the side wall of the upper part of the absorption tank is provided with a noncondensable gas exhaust opening; and the noncondensable gas inlet is connected with an outlet of the vacuum pump through a gas inlet pipe, a pipe opening of the gas inlet pipe is inserted below the liquid surface in the absorption tank, a noncondensable gas discharging valve is arranged at the position, on the noncondensable gas inlet, of the gas inlet pipe, the gas inlet pipe extends outwards to be provided with a blow-down pipeline, and a noncondensable gas blow-down valve is arranged between the gas inlet pipe and the blow-down pipeline. The effect of removing unpleasant odors around a factory is achieved.

Description

technical field [0001] The invention belongs to the technical field of entrained bed coal gasification, and in particular relates to an entrained bed coal gasification flash non-condensable gas purification system and a method thereof. Background technique [0002] During the production and operation of entrained bed coal gasification, it is necessary to use gray water to quench and wash the crude gas, reduce the temperature of the gas, and wash away the dust carried in the gas. In order to recover heat and process and reuse this part of the gray (black) water, A black (gray) water flash system is set up. In the black water flash treatment, a large amount of flash steam is generated, and after condensation, most of this flash steam becomes flash condensate and returns to the system. Among them, there is still a part of non-condensable gas, the main component is H 2 S, NH 3 , CO 2 , CO and CH 4 Wait. This part of the gas is designed to be vented directly, which will cau...

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Problems solved by technology

This part of the gas is designed to be vented directly, which will cause environmental pollution to a certain extent.

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