Method for cleaning methanol fine filter in low-temperature methanol washing device

Abstract

The invention provides a cleaning method for a methanol fine filter of a low-temperature methanol washing device. The cleaning method comprises the following steps of, firstly, opening the end plug of the fine filter; secondly, disassembling the filter element of the fine filter; thirdly, washing the filter element of the fine filter with water for 5-25 minutes; fourthly, cleaning the filter element through a copper brush until no impurities can be sensed from the surface; fifthly, soaking the filter element of the filter in phosphoric acid for 10-15 hours; sixthly, performing ultrasonic cleaning on the filter core for 28-36 hours; seventhly, reassembling the filter element of the fine filter; eighthly, reassembling the end plug of the filter. The cleaning method for the methanol fine filter of the low-temperature methanol washing device can effectively clean the filter element of the filter, prolong the service time of the cleaned filter, reduce the filter cleaning cost, improving the operating efficiency of the filter and save the maintenance cost in millions every year.

Description

technical field [0001] The invention relates to a method for cleaning a methanol fine filter in a low-temperature methanol washing device, and belongs to the technical field of methanol fine filter cleaning. Background technique [0002] In the chemical production using coal as raw material, the crude synthesis gas contains a large amount of excess CO 2 , a small amount of H 2 S, COS and other acid gases, these acid gases are unfavorable to production, and the sulfides in them will cause catalyst poisoning in downstream production, and must be removed and recovered. The commonly used acid gas removal technologies in the coal chemical industry include physical absorption and chemical absorption. Among them, the physical absorption method is more economical and mature, and is widely used in industrial production, and its representatives include low-temperature methanol washing method (Rectisol) and polyethylene glycol dimethyl ether method (NHD). [0003] In the field of co...

AI Technical Summary

Problems solved by technology

Cleaning of the filtered filter element with water and manual cleaning does not meet the process requirements. Impurities in the mesh interlayer cannot be manually removed, and there is a phenomenon of continuous accumulation. The new filter takes a long time to use, and then the time to use it becomes shorter and shorter After half a year of use, the cleaned filter element will be blocked again after only about 4 hours of use, resulting in high equipment cleaning costs, poor methanol filtration effect, and the filter operating rate is less than 40%, which seriously affects the long-term stability of the device. run

[0007] 1. Manual cleaning can only clean the impurities on the outermost layer of the screen, and the impurities in the middle and inner layers of the screen cannot be removed. With the increase of use time, the impurities in the screen interlayer will appear dark cumulative blockage

[0008] 2. Manual cleaning uses copper brushes and steel brushes for cleaning, which can easily damage the size of the screen aperture and shorten the service life of the screen

[0009] 3. Water washing can only wash away surface impurities. At the same time, due to the strong adhesion of impurities in the low-temperature methanol washing device, it cannot be effectively washed, and the impurities inside the screen cannot be removed.