Coal tar filtering device and method

Abstract

The invention relates to a coal tar filtering device and method. The device comprises at least one can-type filter, wherein the can-type filter is internally divided into an after-filtration residual oil collecting chamber, a filter liquor collecting chamber and a filtering chamber from top to bottom; a residual oil leading-out tube plate is arranged between the after-filtration residual oil collecting chamber and the filter liquor collecting chamber; a residual oil leading-out tube is arranged above the residual oil leading-out tube plate, an after-filtration residual oil guide tube is arranged in the filter liquor collecting chamber, an upper filter element fixing plate is arranged between the filter liquor collecting chamber and the filtering chamber, and filter elements and a raw oil distributor as well as a lower filter element fixing plate are arranged in the filtering chamber; the lower filter element fixing plate is connected with the upper filter element fixing plate by a connecting rod, and the upper and lower ends of the filter elements are fixed on the upper filter element fixing plate and the lower filter element fixing plate respectively. According to the invention, the sump oil quantity can be greatly reduced, the filtering precision of the device is improved, the equipment runs stably, the filtering method is relatively simple, the coal tar recovery rate is high, environmental pollution is less, the filtering efficiency is high, and the coal tar filtering device and method are suitable for industrialized application.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a filter device and method for pretreatment of coal tar. Background technique [0002] Coal tar needs to be pretreated during processing to remove mechanical impurities, and filtration is one of the commonly used methods. According to different processes, it can be divided into: tubular automatic backflush filter, tank type automatic backflush filter, and cross-flow backflush filter. [0003] Tubular backwash filter A row of tubular filters is formed side by side, and the filtered filtrate is used for backflushing in chronological order. The frequency of backflushing is high, resulting in more dirty oil, and the filtration efficiency is low; the tank type automatic backwash filter One opening and one preparation, nitrogen or steam explosion back blowing, oil is used to take out impurities during back flushing, and the oil content in dirty oil is high; ...

AI Technical Summary

Problems solved by technology

[0003] Tubular backwash filter A row of tubular filters is formed side by side, and the filtered filtrate is used for backflushing in chronological order. The frequency of backflushing is high, resulting in more dirty oil, and the filtration efficiency is low; the tank type automatic backwash filter One opening and one preparation, nitrogen or steam explosion back blowing, oil is used to take out impurities during back flushing, and the oil content in dirty oil is high; cross-flow automatic back blowing system, after back blowing, the pre-filter oil is used to take out impurities, Low blowback efficiency

[0004] The above automatic backflushing filter devices are used for coal tar filtration. Since coal tar contains a large amount of viscous components such as colloids and asphaltenes, the pressure difference rises rapidly and cannot be recovered by backflushing, and the yield of coal tar is low. Especially for the coal tar hydrogenation process, the filtration accuracy is high, the filter element is easily blocked, and it cannot run stably for a long period of time

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