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A kind of device and method for vocs catalytic oxidation

A catalytic oxidation and reactor technology, applied in chemical instruments and methods, separation methods, chemical/physical processes, etc., can solve the problems of VOCs flammability and explosion, personal safety hazards, ozone layer destruction, etc., and achieve simple structure, temperature and Speed ​​reduction, easy to make effects

Active Publication Date: 2021-11-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Destruction of the ozone layer
(5) Flammable and explosive
Many VOCs are flammable and explosive, causing hidden dangers to personal safety

Method used

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  • A kind of device and method for vocs catalytic oxidation
  • A kind of device and method for vocs catalytic oxidation
  • A kind of device and method for vocs catalytic oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The total length of the reactor is 1267mm, the inner diameter of the cylinder is 80mm, and the inner diameter of the inlet is 20mm. A heating furnace plate is set at 528mm, and a 150mm monolithic catalyst is arranged at 558mm; The length is 223mm, and the angle formed by the hypotenuse of the inlet section of the reactor and the horizontal direction is 10°, the outlet section is tapered, and the length and angle are consistent with the diverging section. The grid specification is: a 1 =5mm, distance Δn=10mm between grid plate and grid plate, grid porosity 40%.

[0065] The inlet gas velocity is 14m / s, and the grid length is 60mm; the gas velocity area weighted uniformity index can reach 0.9344, and the standard deviation is as small as 0.2127.

[0066] The inlet gas velocity is 8m / s, and the grid length is 45mm; the gas velocity area weighted uniformity index can reach 0.9143, and the standard deviation is as small as 0.1518.

[0067] The inlet gas velocity is 22m / s, a...

Embodiment 2

[0069] The total length of the reactor is 1267mm, the inner diameter of the cylinder is 80mm, and the inner diameter of the inlet is 30mm. A heating furnace plate is set at 528mm, and a 150mm monolithic catalyst is arranged at 558mm. The length is 223mm, and the angle formed by the hypotenuse of the inlet section of the reactor and the horizontal direction is 15°, the outlet section is tapered, and the length and angle are consistent with the diverging section. The grid specification is: a 1 =5mm, distance Δn=10mm between grid plate and grid plate, grid porosity 40%.

[0070] The inlet gas velocity is 14m / s, and the grid length is 60mm; the gas velocity area weighted uniformity index can reach 0.9136, and the standard deviation is as small as 0.2264.

[0071] The inlet gas velocity is 8m / s, and the grid length is 45mm; the gas velocity area weighted uniformity index can reach 0.9258, and the standard deviation is as small as 0.1643.

Embodiment 3

[0073] Select the specification as a 1 =5mm, the distance between the grids Δn=10mm, the porosity of 40%, and the grid with a length of 60mm are optimized for the flow field, and the simulation of the catalytic oxidation reaction is carried out: according to the porosity from large to small The catalytic bed layer is arranged in the order of 0.8-0.8-0.6-0.6-0.4, and the rear end of the catalytic bed layer continues to be filled with a cordierite regenerator with a length of 270mm. The gas flow velocity at the inlet of the catalytic section is 2m / s, and the concentration is 8000mg / m 3 , can increase the catalytic conversion rate of toluene from 85% to 89%, and reduce the speed difference between the inlet and outlet of the catalytic bed by one time, the speed difference between the inlet and outlet of the reactor by eight times, and the temperature difference by 45K.

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Abstract

A device and method for catalytic oxidation of VOCs, suitable for catalytic oxidation of a certain concentration of VOCs gas. It is characterized in that: (1) the reactor has a symmetrical structure, and the cross section is circular; (2) the inlet section of the reactor is tapered, and the outlet section is tapered; (3) the grid plate is located at the reactor inlet The interface between the section and the main section of the reactor, and the length can be adjusted with the size of the inlet gas velocity; (4) The catalytic bed is a gradually changing catalytic bed. The invention has a simple structure and is easy to process, and the flow field distribution of the gas flow before entering the catalytic bed layer is uniform, and the temperature and speed in the reactor are reduced, thereby prolonging the service life of the catalyst.

Description

technical field [0001] The invention relates to the technical field of removal of volatile organic compounds, in particular to a VOCs catalytic oxidation device. Background technique [0002] With the development of the economy, all walks of life emit a large amount of waste gas to the environment. For example, the combustion industry will produce waste gas during the combustion of biomass and fuels, and ships, cars, airplanes and other vehicles will produce waste gas during use. Petroleum The processing of products in the chemical industry will emit tail gas, and the process of storage and transportation will emit tail gas. Industries such as paint, printing, electroplating, and pharmaceuticals will emit a large amount of waste gas. Volatile organic compounds (VOCs) exist in these waste gases, and they are discharged together. into the environment. In addition, VOCs will not only pollute the environment, but also cause great harm to the human body. Mainly manifested in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/88B01D53/86B01D53/72B01J8/02
CPCB01D53/8668B01D53/885B01J8/0221
Inventor 梁文俊刘迪任思达李坚
Owner BEIJING UNIV OF TECH