Cleaning device and technology for low-temperature methanol washing feed gas precooler

Abstract

The invention discloses a cleaning device and technology for a low-temperature methanol washing feed gas precooler. The cleaning device comprises a gas washing water processing procedure device, a rawgas precooler and two gas-liquid separators. The raw gas precooler is provided with a washing water inlet, a raw gas inlet, a cooling medium inlet, a cooling medium outlet and a liquid outlet. The bottoms of the gas-liquid separators are both provided with heating assemblies, wherein one gas-liquid separator is switched on, and the other gas-liquid separator is standby. The two gas-liquid separators communicate through a pressurizing pipeline. A system pressurizing valve is arranged on the pressurizing pipeline. Each gas-liquid separator is further provided with a liquid inlet and a raw gas outlet. Each heating assembly is provided with a steam inlet, a condensate outlet, a separated liquid outlet and produced water outlet. According to the cleaning device and technology for the low-temperature methanol washing feed gas precooler, gas water obtained after crushed coal pressurized gasification gas water procedure treatment is fully utilized to circulate in the low-temperature methanolwashing purification procedure raw gas precooler to conduct cleaning, the gas water has the features of being high in temperature and pressure, alkaline and the like, and online treatment of blockageof the crushed coal pressurized gasification purification procedure raw gas precooler can be achieved.

Description

technical field [0001] The invention belongs to the technical field of coal chemical production, and relates to a cleaning device, in particular to a process method and a device for cleaning a crude gas precooler in a low-temperature methanol washing process of a crushed coal pressurized gasification ammonia production process. Background technique [0002] The low-temperature methanol washing process is a purification process suitable for treating high-concentration acid gases. It has the advantages of high purification degree, good selectivity, and desulfurization and decarbonization can be carried out in stages and selectively. Therefore, it has become the current coal chemical project purification process. Process gas washing and purification process commonly used in the process. The process adopts the physical absorption method, uses methanol as the acid gas absorption liquid, and utilizes the physical characteristics of methanol's great solubility to acid gas at a low ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the present invention discloses a low-temperature methanol washing raw material gas pre-cooler cleaning device and process. The crude gas precooler is cleaned in the cleaning and purification process. The gas water has the characteristics of high temperature, high pressure, and alkalinity, which can realize online treatment of the clogging problem of the crude gas precooler in the crushed coal pressurized gasification purification process.

Images