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

A dust removal system and raw gas technology, which is applied in the field of coal chemical industry, can solve the problems of inability to run for a long time, high cost of filter tubes, high equipment requirements, etc., and achieve stable and reliable dust removal effect, simple dust removal method, and simple system design.

Active Publication Date: 2015-12-09
SHENMUFUYOU ENERGY TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

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 remova

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] by figure 1 It can be seen that the liquid phase dust removal system of pyrolysis raw gas in this embodiment is composed of Venturi scrubber 1, tar heat exchanger 2, oil washing tower 3, pressurizing circulating pump 4, dust-containing tar pump 5, oil washing circulating pump 6. Oil washing heat exchanger 7, heating furnace 8, minus one-line circulating pump 9, minus one heat exchanger 10, decompression tower 11, condenser 12, ammonia scrubber 13, reducing roof buffer tank 14, vacuum pump 15, reducing The second heat exchanger 16, the dust-containing heavy oil circulating pump 17, the super-vaporized oil pressurizing pump 18, the reduced second line circulating pump 19, and the reduced top circulating pump 20 are connected by pipelines.

[0026] Specifically: the venturi scrubber 1 of this embodiment is a common device, which uses atomized tar to cool high-temperature raw gas and form dust-containing washing oil and gas, which includes an air inlet, a washing liquid inlet,...

Embodiment 2

[0035] The dust removal system for waste gas in this embodiment is the same as that in Embodiment 1. The method of using this system to remove waste gas from pyrolysis gas is realized by the following steps:

[0036] (1) The pyrolyzed high-temperature raw gas is cooled by the sprayed tar in the Venturi scrubber 1 and atomized to form dust-containing washing oil and gas, and then enters the oil washing tower 3 for oil washing;

[0037] (2) Dust-containing washing oil and coal gas from the bottom of the oil washing tower 3 enter the tower for circulating cooling and dust washing, so that the tar and dust in the raw gas are condensed into the washing oil, and the dry gas is separated, and the temperature of the tower kettle is controlled to 200℃. The tower kettle wash oil is pressurized by the pressurizing circulating pump 4 and cooled to 160°C by the tar heat exchanger 2, part of it goes to the Venturi scrubber 1 as the washing liquid, and the other part enters the tower kettle throug...

Embodiment 3

[0040] The dust removal system for waste gas in this embodiment is the same as that in Embodiment 1. The method of using this system to remove waste gas from pyrolysis gas is realized by the following steps:

[0041] (1) The pyrolyzed high-temperature raw gas is cooled by the sprayed tar in the Venturi scrubber 1 and atomized to form dusty washing oil and gas, and then enters the oil washing tower 3 for oil washing;

[0042] (2) Dust-containing washing oil and coal gas from the bottom of the oil washing tower 3 enter the tower for circulating cooling and dust washing, condensing the tar and dust in the raw gas into the washing oil, separating the dry gas, and controlling the temperature of the tower kettle to 220℃, After the tower kettle wash oil is pressurized by the pressurizing circulating pump 4 and cooled to 180℃ through the tar heat exchanger 2, part of it goes to the Venturi scrubber 1 as the washing liquid, and the other part enters the tower kettle through the tower reactor...

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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...

Claims

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Application Information

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IPC IPC(8): C10K1/02C10K1/16
Inventor 杨占彪王树宽
Owner SHENMUFUYOU ENERGY TECH
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