Method for improving methanol utilization rate of low-temperature methanol washing system

Abstract

The invention discloses a method for improving the methanol utilization rate of a low-temperature methanol washing system, relates to the technical field of coal chemical industry, and solves the problems that a low-temperature methanol washing system in the prior art is poor in methanol filtering effect and needs to be detached for cleaning. The slag liquid obtained after primary backwashing, secondary backwashing and methanol filter backwashing enters a slag liquid settling separation device, a liquid discharge valve is opened for liquid discharge after a certain time of precipitation process, and concentrated slag is collected to the bottom of the slag liquid settling separation device and discharged in a centralized manner at proper time; the cleanliness of the methanol circulating solution is improved, and the solid content of the filtered solution is 0.02%-0.04%; the concentrated slag liquid after backwashing is settled, so that pure methanol circulating liquid can be recycled; according to the method, cleaning operation can be completed under the condition that equipment is not dismantled, long-period stable operation of low-temperature methanol washing is guaranteed, and production continuity is guaranteed.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a method for improving the utilization rate of methanol in a low-temperature methanol washing system. Background technique [0002] At present, in all domestic enterprises that adopt the coal-to-methanol process, the solution filter of the solution system of the low-temperature methanol washing device is faced with the problems of short operation period, high cleaning frequency and poor filtration effect, which leads to poor solution absorption effect and heat exchanger replacement. The thermal efficiency becomes lower, and the operating cycle of the dynamic equipment is shortened, which affects the stability of the device and increases the production cost. The filter installed in the low-temperature methanol washing system has the problem of poor interception of mechanical solid impurities. The filtration accuracy is 400um, and most of the tiny particles cannot be...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the low-temperature methanol washing system in the prior art has poor methanol filtration effect and needs to be disassembled and cleaned, the present invention provides a method for improving the utilization rate of methanol in the low-temperature methanol washing system. Impurities are discharged in an orderly manner, reducing the loss of methanol solution and prolonging the operating cycle of the system device

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