Liquid-phase dust removing system and liquid-phase dust removing method of pyrolysis coke-oven gas

Abstract

The present invention relates to a liquid-phase dust removing system and a liquid-phase dust removing method of pyrolysis coke-oven gas. The system comprises a venturi washer, an oil washing tower and a pressure reducing tower, wherein the tar and the dust in the coke-oven gas are condensed into the washing oil through the quenching cooling of the Venturi washer and the cooling dust removing of the oil washing tower, and the dust-containing washing oil is subjected to pressure reducing distillation to obtain the qualified tar product. According to the present invention, the system has characteristics of simple design, stable operation, economy, efficient and good safety, the dust removing method has characteristics of simpleness, high dust removing efficiency and stable and reliable dust removing effect, the quinoline insoluble substance content in the product oil can be less than 0.5%, the quinoline insoluble substance content in the dry coal gas is less than 1%, and the high concentration dust-containing heavy oil is circulated to the reactor so as to be subjected to pyrolysis again, such that the good dust removing purpose is achieved.

Description

Technical field [0001] The invention belongs to the technical field of coal chemical industry, and specifically relates to a liquid phase dust removal system and method for raw gas produced by coal pyrolysis. Background technique [0002] The current coarse dust removal methods for raw gas produced by coal pyrolysis are mainly gravity sedimentation and cyclone dust collector at high temperature. However, due to the limitation of cyclone cutting particle size, the dust below 10um cannot be removed, so the recovered coal tar dust should be controlled to 3% Within, to ensure that the system can operate stably, a finer dust removal method at high temperatures is required. [0003] Optional methods for fine dust removal of raw gas include particle layer dust removal, metal tube filter dust removal, and electric dust removal. [0004] Due to the low specific resistance of coke powder at high temperatures, the easy carbon formation of electrode wires, and the easy reduction of metals in th...

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Problems solved by technology

[0004] 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.

[0005] 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

[0006] 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 problems such as relative movement between particles and channel flow. 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 condensation reaction carbon deposition, and cannot be operated for a long time.

[0007] Although the above dust removal methods have their own characteristics, they are all dust removal under high temperature gas phase conditions, which have higher requirements for equipment.

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