Purification method for PAN-based carbon fiber production waste gas

A waste gas purification and carbon fiber technology, applied in chemical instruments and methods, combustion methods, separation methods, etc., can solve problems such as easy blockage of equipment, difficulty in waste heat recovery, easy blockage of combustion equipment, etc., to ensure normal operation and reduce the concentration of particulate matter , The effect of continuous and stable production

Pending Publication Date: 2021-12-21
JILIN INST OF CHEM TECH
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Problems solved by technology

Such as lack of pretreatment facilities in the treatment process, easy blockage of combustion equipment, difficulty in waste heat recovery, frequent equipment maintenance and continuous and stable production, etc.
[0004] Therefore, it is an urgent need for those skilled in the art to provide a PAN-based carbon fiber production exhaust gas purification method that solves the problems of easy blockage of exhaust gas purification and combustion equipment in PAN-based carbon fiber production enterprises, difficulty in waste heat recovery, frequent equipment maintenance, and inability to continue production. question

Method used

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  • Purification method for PAN-based carbon fiber production waste gas

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Effect test

Embodiment 1

[0033] The scheme of the present invention is applied in the waste gas treatment of 160 tons of polyacrylonitrile carbon fiber production in a certain carbon fiber enterprise, and its specific circumstances are as follows:

[0034] (1) During the production process of PAN-based carbon fiber, the exhaust gas of the oxidation furnace, the exhaust gas of the low-temperature carbonization furnace and the exhaust gas of the high-temperature carbonization furnace are mixed and sent to the filter through the fan, and the exhaust gas volume is 1.1×10 4 m 3 / h, the concentration of particulate matter in the main pollutants is 8.5mg / m 3 , HCN concentration 2.7mg / m 3 , NH 3 Concentration 12.4mg / m 3 . The filter is equipped with low, medium and high-efficiency three-layer polytetrafluoroethylene filter cotton, and a differential pressure gauge is installed at both ends of the filter inlet and outlet. When the pressure loss of the filter exceeds 1000Pa, it should be cleaned or replaced...

Embodiment 2

[0038] The scheme of the present invention is applied in the waste gas treatment of 500 tons of polyacrylonitrile carbon fiber production in a certain carbon fiber enterprise, and its specific circumstances are as follows:

[0039] (1) During the production process of PAN-based carbon fiber, the exhaust gas from the oxidation furnace, the exhaust gas from the low-temperature carbonization furnace and the exhaust gas from the high-temperature carbonization furnace are mixed and sent to the filter through the fan, and the exhaust gas volume is 3.5×10 4 m 3 / h, the concentration of particulate matter in the main pollutants is 10.2mg / m 3 , HCN concentration 2.5mg / m 3 , NH 3 Concentration 13.6mg / m 3 . The filter is equipped with a low-medium-high-efficiency three-layer PTFE filter plate, and a differential pressure gauge is installed at both ends of the filter inlet and outlet. When the pressure loss of the filter exceeds 1200Pa, it should be cleaned or replaced in time. The part...

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Abstract

The invention discloses a purification method for PAN-based carbon fiber production waste gas. The method comprises the following steps: the PAN-based carbon fiber production waste gas is pretreated; the pretreated PAN-based carbon fiber production waste gas is introduced into a heat storage type thermal incineration system through a waste gas fan; the temperature of the waste gas is increased to 800 DEG C, so pollutants in the PAN-based carbon fiber production waste gas in the heat storage chamber are oxidized; and gas fully oxidized in the heat storage type thermal incineration system is induced by an induced draft fan and is exhausted through an exhaust funnel. According to the invention, a filter filled with a filtering material is used for filtering, so the concentration of particulate matters such as tar can be reduced, and normal operation of the heat storage type thermal incineration system is guaranteed; and the heat storage type thermal incineration system of a fixed three-chamber structure is utilized, main components in the waste gas are removed through thermal oxidation, generation of thermal nitric oxide is reduced, and a heat accumulator can recover heat generated by combustion to guarantee the temperature of the thermal oxidation chamber, thereby achieving energy-saving effect.

Description

technical field [0001] The invention relates to the technical field of PAN-based carbon fiber production waste gas treatment, in particular to a method for purifying PAN-based carbon fiber production waste gas. Background technique [0002] The waste gas from the production of polyacrylonitrile (PAN)-based carbon fiber contains HCN, NH 3 , CO, tar and organic gases and other toxic and harmful substances, among which the main pollutants are HCN, NH 3 , HCN is a highly toxic substance that is difficult to handle, with strong corrosiveness and toxicity. At present, the waste gas from the production of PAN-based carbon fiber can be purified by direct combustion, absorption and adsorption. In particular, the direct combustion method is a processing technology widely used in carbon fiber production lines. The direct combustion method is to convert the HCN and NH in the exhaust gas 3 Combustible components such as , CO and hydrocarbons are converted into CO by combustion under ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/79B01D46/00B01D46/30B01D53/58B01D53/62B01D53/68B01D53/72F23G7/06
CPCB01D53/79B01D53/68B01D53/58B01D53/62B01D53/72B01D46/30F23G7/06F23G2209/14B01D2251/304B01D2251/604
Inventor 廉今兰李英华
Owner JILIN INST OF CHEM TECH
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