Dust removal system and method for raw coke oven gas by virtue of rotary type fixed bed

Abstract

The invention relates to a dust removal system and method for raw coke oven gas by virtue of a rotary type fixed bed. The dust removal system comprises a dust remover, a filter material regeneration furnace, a high-temperature bucket elevator and a high-temperature vibrating screen, wherein the filter material outlet of the dust remover is communicated with the feeding hole of the filter material regeneration furnace; the discharge hole of the filter material regeneration furnace is communicated with the feeding hole of the high-temperature bucket elevator; the discharge hole of the high-temperature bucket elevator is communicated with the high-temperature vibrating screen; and the high-temperature vibrating screen is respectively communicated with the filter material inlet of the dust remover through a pipeline. According to the dust removal system and method, updating of the filter material is achieved by using the displacement fixing and circumference rotating mechanisms of a turntable; regeneration and sieving of the filter material are achieved through the filter material regeneration furnace, the high-temperature bucket elevator and the high-temperature vibrating screen; and continuous regeneration of the filter material is achieved, thus the problem that the fixed bed filter material is difficult to regenerate due to carbon deposition is effectively solved; the dust removal efficiency is greatly improved; heat loss is reduced; the dust removal method disclosed by the invention is simple in process, stable in operation, low in cost, and suitable for industrial production; continuous regeneration of the filter material can be achieved; and the dust removal efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a system and method for dedusting raw gas produced by coal pyrolysis with a rotary fixed bed. Background technique [0002] Over the years, a series of studies have been carried out at home and abroad on the production of semi-coke, coal tar and gas by pyrolysis of pulverized coal. So far, a large number of pilot tests or industrial tests have been carried out, but almost none of them can produce continuously and stably. However, the main bottleneck restricting this industry is the failure to break through the dust removal of raw gas. [0003] At present, the coarse dust removal method for raw gas is mainly the cyclone dust collector, but due to the limitation of the cyclone cutting particle size, the dust below 10um cannot be removed, resulting in a large amount of dust in the recovered coal tar, which turns into sludge, and the device cannot operate. ...

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Problems solved by technology

[0005] Electrostatic precipitator has not been widely used in industrial production due to the low specific resistance of coke powder at high temperature, easy carbonization of electrode wire, and easy reduction of metals in reducing atmosphere.

[0006] Renewable metal membrane tube filtration has high dust removal efficiency and high precision, and has been widely used in high-temperature gas purification. However, due to the large amount of coal tar contained in raw coal gas, the mechanism of polycondensation reaction carbon formation at high temperature gradually blocks the filter tube. , the recoil regeneration effect is getting worse and worse, and the device cannot run for a long period

And the cost of the filter tube is high, and the replacement cost is large

[0007] Granular layer dust removal filter material is easy to obtain, low in cost, and easy to regenerate. At present, there are mainly cross-flow granular layer filters, counter-flow granular layer filters, and fixed-bed filters. Compared with cross-flow filters and counter-flow filters The dust removal efficiency is low due to the relative movement between particles, channel flow and other problems. The fixed bed particles have no relative movement and the dust removal efficiency is high. However, the high-temperature oil and gas of raw coal gas are prone to polycondensation reaction carbon deposition, and cannot be operated for a long time. Patent 201310418922.x is in The industrial application of raw gas dust removal shows that the dust removal efficiency is 99.9%, and the quinoline content in tar is not more than 1%, which is better than the design parameters

However, it is difficult to regenerate carbon deposits in the filter material after long-term operation, which affects the dust removal efficiency.

[0008] In order to maintain the advantages of high filtration efficiency of the fixed bed and overcome its shortcomings, if a mobile fixed bed can be proposed to retain the advantages of the fixed bed, it will be able to solve the difficulty that the filter material of the fixed bed cannot be regenerated

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