Gasification device slag-water flash steam comprehensive utilization system and method

Abstract

The invention relates to a comprehensive utilization system and method for slag-water flash steam of a gasification device. The comprehensive utilization system for the slag-water flash steam of the gasification device comprises a lithium bromide absorption refrigeration device, an external ash discharge water cooler, a flash steam primary separator, a flash steam secondary separator, a flash steam primary cooler, a static mixer and an acid gas removal device. The system disclosed by the invention is wide in application range, and is suitable for a gasification device for hydrogen production or ammonia synthesis by taking coal, petroleum coke, residual oil, multi-component slurry and the like as raw materials, and an acid gas removal device provided with a recycle gas compressor; low-levelheat energy of flash steam is fully utilized for producing chilled water, and the problem that the temperature of discharged ash water is too high is solved; effective components in the flash steam can be fully recovered, the hydrogen recovery rate is improved, and the economic benefit is remarkable; relying on supercharging equipment of an existing process, the load and the size of newly-added equipment are greatly reduced, initial investment is low, and the technological process is simple.

Description

technical field [0001] The invention relates to the field of chemical industry, and specifically refers to a system and a process for comprehensively utilizing coal, residual oil, multi-component slurry, etc. as gasification raw materials to produce flash gas after slag water flashing treatment in a device. Background technique [0002] In a gasification device that uses coal, residual oil, multi-component slurry, etc. as gasification raw materials, the high-temperature crude syngas produced by the gasifier is washed and cooled by chilled water, and most of the ash and fine particles remain in the slag water. The water undergoes secondary or tertiary flash evaporation and clarification treatment to become gray water for reuse. The high-pressure flash (or primary flash) treatment of slag water can decompose a large amount of acid gas dissolved in it to form flash steam, and at the same time, the black water itself is also concentrated. Since the flash gas contains a large am...

AI Technical Summary

Problems solved by technology

[0007] The first technical problem to be solved by the present invention is to provide a gasification device that can recycle the low-level heat energy and effective gas components in the flash gas and solve the problem of excessive temperature of the discharged ash water in view of the current state of the art Slag water flash steam comprehensive utilization system

[0008] The second technical problem to be solved by the present invention is to provide a method for comprehensive utilization of slag water flash steam in a gasification device, which can recycle low-level heat energy and effective gas components in flash steam and Solve the problem that the temperature of the gray water discharged outside is too high and cannot be cooled by conventional methods

Images