Catalytic oxidation treatment process for carbon fiber oxidation unit tail gas

A catalytic oxidation and treatment process technology, which is applied in chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve the problems that the exhaust gas of the oxidation unit cannot meet the environmental protection requirements, the incineration exhaust gas is large, and the operation cost is high, so as to achieve stable operation , low operating cost, and thorough exhaust gas treatment

Inactive Publication Date: 2010-07-28
SHANGHAI DONGHUA ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the disadvantages of the thermal incineration process and the regenerative thermal oxidation process for treating the tail gas of the oxidation unit are fuel consumption, high operating costs, large incineration exhaust, and some ammonia and hydrogen cyanide will be oxidized into Nitrogen oxides, causing secondary pollution
Using the general tail gas treatment process to treat the tail gas of the carbon fiber process oxidation unit cannot meet the environmental protection requirements

Method used

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  • Catalytic oxidation treatment process for carbon fiber oxidation unit tail gas
  • Catalytic oxidation treatment process for carbon fiber oxidation unit tail gas
  • Catalytic oxidation treatment process for carbon fiber oxidation unit tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The tail gas of the carbon fiber oxidation unit of the present invention comes from a polyacrylonitrile synthetic carbon fiber production device of a certain company, and the working conditions are shown in Table 1.

[0028] Table 1 Composition of exhaust gas from the oxidation unit of polyacrylonitrile synthetic carbon fiber in a company

[0029] serial number

[0030] The tail gas from the polyacrylonitrile synthetic carbon fiber oxidation unit goes through the impurity remover 1 to remove impurities such as silicone oil and dust, and then enters the catalytic oxidation reactor 2. The impurity remover 1 and the catalytic oxidation reactor 2 respectively adopt the mixture of ferric oxide and manganese oxide as the catalyst, and the above-mentioned tail gas is carried out catalytic oxidation reaction in the catalytic oxidation reactor 2, and the pressure is about -3kPa (G), and the inlet temperature At about 220°C and an outlet temperature of about 300°C, harm...

Embodiment 2

[0037] The impurity remover 1 adopts ferrous oxide catalyst, the catalytic oxidation reactor 2 adopts manganese dioxide catalyst, the internal pressure of the catalytic oxidation reactor 2 is about -15kPa(G), the inlet temperature is about 110°C, and the outlet temperature is about 220°C, All the other are with embodiment 1.

[0038] The treated exhaust gas was sampled and sent to the laboratory for testing. The test results for the content of non-methane total hydrocarbons, ammonia, hydrogen cyanide and nitrogen oxides in the purified tail gas are shown in Table 3.

[0039] Table 3 Monitoring data and control indicators of a provincial environmental monitoring center station

[0040] Pollutant name

Embodiment 3

[0042] The impurity remover 1 and the catalytic oxidation reactor 2 respectively use ferric oxide catalyst, the internal pressure of the catalytic oxidation reactor 2 is about -5kPa(G), the inlet temperature is about 160°C, the outlet temperature is about 280°C, and the rest are implemented in the same way example 1. The treated exhaust gas was sampled and sent to the laboratory for testing. The results of the content testing of non-methane total hydrocarbons, ammonia, hydrogen cyanide and nitrogen oxides in the purified tail gas are shown in Table 4.

[0043] Table 4 Monitoring data and control indicators of a provincial environmental monitoring center station

[0044] Pollutant name

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Abstract

The invention provides a catalytic oxidation treatment process for carbon fiber oxidation unit tail gas, which has the innovative points that: after impurities such as silicone oil, dust and the like in the carbon fiber oxidation unit tail gas are removed first through the room temperature absorption of an impurity removing device, the tail gas enters a catalytic oxidation reactor, and a catalyst of ferriferous oxide or manganese oxide or a mixture thereof is respectively arranged in catalyst fixed bed layers of the impurity removing device and the catalytic oxidation reactor, wherein the intrinsic pressure in the catalytic oxidation reactor is between -15 and 30 kPa (G), the inlet temperature is between 100 and 450 DEG C, and the outlet temperature is between 200 and 550 DEG C; and harmful volatile organic matters such as ammonia, hydrogen cyanide and the like are converted into nitrogen, carbon dioxide and water, and purified gas is subjected to heat recovery and then is discharged to atmosphere through a tail gas draught fan. The catalytic oxidation treatment process has the advantages that: the influence of the impurities in the tail gas on the catalyst is eliminated by adopting the impurity removing technology, so that catalyst poisoning is prevented; the process is simple, system resistance is small, fuel is not needed to be added additionally in the running process, and the running cost is low; and the tail gas treatment is radical without secondary pollution, and detection results meet the standard of national environmental protection.

Description

technical field [0001] The invention relates to a catalytic oxidation treatment process for the tail gas of an oxidation unit in the industrial production of carbon fiber. Background technique [0002] Carbon fiber is made from any of lignin, polypropylene nitrile, phenolic, polyvinyl alcohol, polyvinyl chloride, polyol, viscose fiber, asphalt, etc., after pre-oxidation and carbonization, and then surface treatment. of. [0003] During the carbon fiber synthesis process, two tail gases are produced, which are the tail gas of the oxidation unit and the tail gas of the carbonization unit. The tail gas of the oxidation unit in the carbon fiber synthesis process has the following characteristics: the tail gas has a large flow rate, low concentration, and high fuel consumption for direct combustion; the tail gas contains highly toxic substances such as hydrogen cyanide, which is difficult to treat; the tail gas contains components such as silicone oil that are easy to poison the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/54B01D53/56B01D53/58B01D53/62
Inventor 赵苑西
Owner SHANGHAI DONGHUA ENVIRONMENT ENG
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