Recycling device of organic solvent in high-concentration organic waste gas

A technology of organic waste gas and organic solvents, applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problems of heat loss, explosion, carbon bed ignition, etc., and achieve the effect of low price and obvious economic benefits

Inactive Publication Date: 2015-07-01
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is mainly to meet the high-concentration organic waste gas or high-reactivity VOCs treatment in the adsorption process, often due to the catalytic oxidation and exothermic reaction between the adsorbed substance and the adsorbent, resulting in the inability of the fixed bed to dissipate heat in time and then occur Carbon bed fire or explosion problem, and provide a multi-layer fluidized bed as an adsorption tower, so that the adsorbent can keep the flow state at all times and lose heat in time

Method used

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  • Recycling device of organic solvent in high-concentration organic waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Acetone organic waste gas in the waste gas, the treatment capacity is 300m3 / h, and the acetone content is 10g / m3;

[0026] (2) There are multi-layer gas distribution plates inside the multi-layer fluidized bed adsorption tower, a gas flow inlet is set at the bottom and connected to an exhaust gas fan, and a cyclone dust collector with a purified gas outlet is set at the top, through which the 40-mesh coconut shell activated carbon adsorbent The exhaust gas is flowed and adsorbed inside; the external circulation is adopted between the layers of the adsorption tower;

[0027] (3) Use a multi-layer fluidized bed adsorption tower with 3 layers, and the layer height: 1200mm;

[0028] (4) The organic waste gas is in contact with the adsorbent, the residence time of the gas in the bed is 5s, and the residence time of the solid in the bed is 6min;

[0029] (5) The desorption gas in the desorption tower is nitrogen, which is recycled, and the optimum temperature is 190°C; ...

Embodiment 2

[0034] (1) Isopropanol organic waste gas in the exhaust gas, the treatment capacity is 300m3 / h, and the isopropanol content is 15g / m3;

[0035] (2) There are multi-layer gas distribution plates inside the multi-layer fluidized bed adsorption tower, a gas flow inlet is set at the bottom and an exhaust gas fan is connected, and a cyclone dust collector with a purified gas outlet is set at the top, and the 50-mesh coconut shell activated carbon adsorbent is passed through The exhaust gas is flowed and adsorbed inside; the external circulation is adopted between the layers of the adsorption tower;

[0036] (3) Use multi-layer fluidized bed adsorption tower with 10 layers, layer height: 800mm;

[0037] (4) The organic waste gas is in contact with the adsorbent, the residence time of the gas in the bed is 40s, and the residence time of the solid in the bed is 60min;

[0038] (5) The desorption gas in the desorption tower is nitrogen, which is recycled, and the optimum temperature i...

Embodiment 3

[0042] (1) Toluene organic waste gas in the waste gas, the treatment capacity is 300m3 / h, and the toluene content is 15g / m3;

[0043] (2) There are multi-layer gas distribution plates inside the multi-layer fluidized bed adsorption tower, a gas flow inlet is set at the bottom and an exhaust gas fan is connected, a cyclone dust collector with a purified gas outlet is set at the top, and the 70-mesh coconut shell activated carbon adsorbent is passed through The exhaust gas is flowed and adsorbed inside; the external circulation is adopted between the layers of the adsorption tower;

[0044] (3) Use a multi-layer fluidized bed adsorption tower with 15 layers, layer height: 600mm;

[0045] (4) The organic waste gas is in contact with the adsorbent, the residence time of the gas in the bed is 60s, and the residence time of the solid in the bed is 80min;

[0046] (5) The desorption gas in the desorption tower is nitrogen, which is recycled, and the optimum temperature is 165°C;

...

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Abstract

The invention provides a recycling device of an organic solvent in a high-concentration organic waste gas. The recycling device comprises a multi-layer fluidized bed adsorption column, an adsorbent conveying system, a desorption column and a condensing column, wherein the middle section in the fluidized bed adsorption column is separated into 3-15 layers via gas distribution plates, and the layer height is 600mm-1200mm; the bottom of the fluidized bed adsorption column is provided with an air stream inlet and is connected with a waste gas fan; the top of the fluidized bed adsorption column is provided with a cyclone separator with a purified gas outlet and a spiral feeding device; irregular hard nut shell active carbon with the particle size of 40 meshes-70 meshes acts as an adsorbent and flows inside to adsorb waste gas, and the adsorbent flows from the upper layer to the lower layer via an external overflow pipe; nitrogen at 165 DEG C-190 DEG C in the desorption column acts as a desorption gas, and can be recycled. The device not only can solve the difficulty that a bed layer is fired and exploded since reaction heat cannot dissipate due to ultrahigh concentration of a high-concentration organic waste gas at present, and also can reduce the solvent recycling cost.

Description

technical field [0001] The invention relates to a device for recovering organic solvent in high-concentration organic waste gas of a multi-layer fluidized bed, which solves the problem of bed fire caused by the inability to dissipate reaction heat in time in the current industry using fixed bed adsorption. According to its structural characteristics, it can be used in combination with irregular granular activated carbon with low price and hard fruit shell as raw material, and the economic benefits are obvious. Background technique [0002] Based on the high selectivity of the adsorbent, it can handle mixtures that are difficult to separate by other processes, without secondary pollution, high purification efficiency, convenient operation and automatic control. At present, the fixed bed adsorption method is mainly used in the industry to remove volatile organic compounds from low-concentration waste gas. Gas VOC (Volatile Organic Compounds, VOCs), but when encountering high-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/12
Inventor 张向京高晓洋胡永琪
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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