Raw coke oven gas dedusting device and raw coke oven gas dedusting method

Abstract

The invention relates to a raw coke oven gas dedusting device and a raw coke oven gas dedusting method. The device consists of at least one dedusting unit; each dedusting unit comprises a filter; the filter is respectively communicated with a raw coal oven gas pipeline, a coal oven gas cooler as well as a gas replacement pipeline; the coal gas cooler is communicated with a bag-type deduster; the bag-type deduster and an oil-free gas pipeline are communicated with a circulation fan; the circulation fan is communicated with a coal oven gas heater; a purified gas outlet in the bottom of each filter is communicated with a purified gas emission pipeline; a blowback gas inlet is communicated with a blowback gas pipeline; the blowback gas pipeline and a gas replacement pipeline are communicated with a coal gas heater. The whole device is simple in structure, runs stably, is low in energy consumption, and is high in filtering efficiency; a circulation ash blowing regeneration system is not arranged, bed materials are not required to be circulated, filter materials are prevented from being crushed during the filtering process and the abrasion to equipment is prevented; multiple dedusting devices can be in parallel combination for filtering. According to the method provided by the invention, the operation is simple and convenient, the dedusting efficiency is high, pressure difference is low, energy consumption is low, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry for high-temperature dedusting of oily gas, and in particular relates to a dedusting device and a dedusting method for raw coal gas produced in the process of producing coal tar by pyrolysis of pulverized coal. Background technique [0002] In recent years, there have been extensive researches on the production of coal tar by low-temperature pyrolysis of coal at home and abroad, but the raw gas produced during the production process contains a large amount of raw gas containing coke powder, and there has been no breakthrough in dust removal, which seriously restricts this process. industry development. [0003] At present, there are three methods for dedusting a kind of raw coal gas. The first method is to use a combined cyclone separator, which has low separation efficiency and cannot separate coal dust below 5 μm, and cannot separate a large amount of oil sludge; the second method...

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Problems solved by technology

[0003] At present, there are three methods for dedusting a kind of raw coal gas. The first method is to use a combined cyclone separator, which has low separation efficiency and cannot separate coal dust below 5 μm, and cannot separate a large amount of oil sludge; the second method is electric dust removal. , because the tar-containing raw gas temperature is lower than the tar freezing point and will condense, the electric dust collector needs to be operated at high temperature, the high temperature corrosion of the electrode wire cannot be solved, and the electric dust collector has a large volume, and the tar residence time is too long, and the secondary cracking will be serious. As a result, the yield of tar drops; the third method is automatic backflushing and filtering of ceramic and powder metal tubes. Under high temperature, raw coal gas accumulates carbon on the surface of the tubes to make the pressure difference rise continuously. run

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