Ranking method of separation media in boiling bed separator

Abstract

The invention discloses and relates to a ranking method of separation media in a boiling bed separator. The method comprises the steps that a whirlcone is arranged at the upper part of the boiling bed separator; during the regeneration, the separation media in a filtering bed layer of the boiling bed separator is in a complete fluidized state; the separation media upwards enters the whirlcone; after cyclone ranking, the separation media flows out from the whirlcone in a sequence from high specific gravity to low specific gravity; after the back flushing regeneration is completed, the separation media is continuously used for purifying process water generated in a MTO (Methanol To Olefin) process, wherein the filtering bed layer of the boiling bed separator is formed by multiple layers of different separation media; the separation media particle size distribution is downwards reduced layer by layer; the specific gravity of the separation media is downwards increased layer by layer.

Description

technical field [0001] The disclosure belongs to the technical field of coal chemical process water treatment, in particular, it relates to a method for selecting, sorting, and grading separation media in a fluidized bed separator, and is applicable to a fluidized bed separator used for treating process water in a methanol-to-olefins process Removal and concentration of oily wax and particles. Background technique [0002] Methanol to Olefin, referred to as MTO (Methanol to Olefin), refers to the process of preparing light olefins through catalytic reaction using methanol as raw material. In MTO industrial production, the reaction gas produced from the reactor carries worn catalyst particles and oily substances. After being separated by a three-stage cyclone separator, a part of the catalyst and oily substances will be entrained in the reaction gas and enter the quenching tower, The water washing tower, and after being cooled and washed by the quenching tower and the water ...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of the precision filtration device itself, the pressure difference of the precision filtration device rises rapidly during the process of treating the quench water from methanol to olefins, and the backwashing is not thorough, so it cannot be put into normal use, resulting in the inability to effectively remove fine particles and accumulate in the system , so that the solid content balance value in the quenching water system is as high as 500-1000mg / L, resulting in severe blockage of the heat exchanger and air cooler in the quenching water system, and insufficient heat transfer efficiency, which requires frequent cleaning of the heat exchanger, which greatly increases system maintenance. cost, affecting the long-term operation of the device

[0004] Chinese patent application 201410173205.X discloses that the treatment method is to filter the quenching water and washing water through the ultrafiltration membrane to obtain the treated clear liquid and return it to the system for reuse. High, the main problem to be solved should be to reduce its solid content, and ultrafiltration membrane filtration is precision filtration, with small permeation flux and small processing capacity, which cannot meet the actual industrial application. At the same time, the particle size of the catalyst is small, and the solution can be directly filtered Clogging the filter holes, causing the filtration pressure to increase instantaneously and terminate the filtration

Chinese patent application 20101053902.3 proposes micro-swirl separation of MTO quenching water using micro-swirl technology to remove catalyst particles entrained in it; micro-swirl separators can separate fine particles below 3 μm, especially very fine particles below 1 μm The problem of limited efficiency, and because of its structural characteristics, it is easy to cause clogging, low separation accuracy, incomplete catalyst recovery, high pressure drop and other problems, which increase the energy consumption output and the difficulty of cleaning and maintenance in the later stage

Chinese patent application CN 205031975 U discloses a device that uses sintered metal to filter MTO quenching water, and regenerates the filter element by backflushing and chemical cleaning; the disadvantage is that the sintered metal has small voids, and the catalyst particles in the quenching water are easy to block Pores, using chemical cleaning to produce a large amount of chemical waste liquid, the cost of post-processing is high, and it will corrode the filter element, which needs to be replaced regularly, which is expensive and maintains high

[0005] Therefore, in order to solve the problem that fine particles and oily substances are difficult to remove in the process water of the methanol-to-olefins plant in the prior art, it is urgent to develop a method for selecting, sorting, and grading the separation medium in the ebullated bed separator to Separation of fine particle pollutants in the cooling water of the methanol-to-olefins process, reducing the frequency of heat exchanger cleaning, and realizing long-term stable operation of the methanol-to-olefins unit

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