Method for solid removal of MTO quenched water and online cleaning of water scrubber

Abstract

The invention relates to a method for solid removal of MTO (Methanol to Olefins) quenched water and online cleaning of a water scrubber. The method comprises the following steps: (1) adding a high-temperature extraction agent into the quenched water drained from the bottom of a quench tower and then pouring into a separating device, returning the separated clean water to the quench tower and discharging the waste water containing a catalyst into a sewage disposal system; (2) adding a dirt dispersion agent for the water scrubber into a seriously scaled part of the water scrubber, circulating the drug in the water scrubber, discharging the newly formed scales in the water scrubber in the manner of following the outward draining water, peeling off the scales formed on tower plates and tower walls in the water scrubber by the dirt dispersion agent for the water scrubber, smashing into fine particles and then discharging from the bottom of the water scrubber in the manner of following the outward draining water. The method has the beneficialeffects that the scales remained in the water scrubber and a heat exchanger can be greatly reduced; the pressure difference of the water scrubber can be obviously reduced; theefficiency of the heat exchanger can be greatly increased; the cleaning period of the heat exchanger can be doubled or above; and according to the method, the solid content and suspended solid content in the quenched water can be effectively reduced.

Description

[0001] 1. Technical field [0002] The invention relates to the field of chemical industry, in particular to a method for desolidification of MTO quenching water and online cleaning of a water washing tower. [0003] 2. Background technology [0004] The quenching and stripping system in the MTO section mainly includes a quenching tower, a water washing tower and a sewage stripping tower. The product gas from the reaction system passes through the quenching tower and the water washing tower to remove superheat and wash the catalyst, and most of the water is condensed and then sent to the downstream olefin separation device For separation and refining. The washing water used to wash the product gas is recycled. Since the hydrocyclone cannot completely and effectively separate and remove the fine catalyst powder in the washing water, it is easy to cause the blockage of the quench tower 1 and the downstream heat exchanger, and at the same time, the vicious cycle will cause the was...

AI Technical Summary

Problems solved by technology

After investigation of multiple devices, most of the MTO devices are found to contain waxy substances in the actual operation process of the water system. These substances condense in the water system air cooling, heat exchangers and pipelines, seriously affecting the long-term stable operation of the device, and also affecting the production of the MTO device. main factor of load

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