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Method and device for removing SOx and NOx in catalytic cracking flue gas

A catalytic cracking and flue gas technology, applied in the field of flue gas purification, can solve the problems of waste water or waste residue, difficulty in continuous operation, and further improvement of removal rate, so as to avoid the influence of side reactions and reduce the risk of escape

Active Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the prior art provides SO removal in combustion flue gas x and NO x The method can realize the purification of catalytic cracking flue gas to a certain extent, but SO x and NO x The removal rate needs to be further improved. In addition, the methods provided by the prior art often produce waste water or waste residue, and it is difficult to realize continuous operation.

Method used

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  • Method and device for removing SOx and NOx in catalytic cracking flue gas

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specific Embodiment approach

[0054] According to a specific embodiment of the present invention, the method further includes degassing the regenerated adsorbent, and then feeding the adsorbent into the inlet of the riser reactor, and returning the obtained gas to the regeneration reactor.

[0055] In the present invention, the type of reducing gas used in step b) is not particularly limited, and may be various reducing gases conventionally used in the art. Preferably, the reducing gas is selected from H 2 , NH 3 , CO, CH 4 and at least one of light hydrocarbons with 2-4 carbon atoms, more preferably NH 3 .

Embodiment approach

[0056] According to a specific embodiment of the present invention, the reducing gas can be carried by a carrier gas and contacted with the catalytic cracking flue gas after SOx removal and a catalyst to perform a selective reduction reaction. The carrier gas can be air.

[0057] According to the present invention, preferably, the amount of the reducing gas used is 0.7-1.5 times, more preferably 0.9-1.1 times, the theoretical amount required for the reaction between the reducing gas and NOx. The required theoretical dosage refers to the theoretical stoichiometric value required for the reaction between the reducing gas and NOx. The reducing gas is NH 3 , NOx is NO as an example, NH 3 react with NO in the presence of a catalyst to form N 2 and H 2 O, NH required for 3 moles of NO 3 The theoretical dosage is 2 moles.

[0058] According to the present invention, the selection of the catalyst is not particularly limited, and may be a catalyst commonly used in the art for sel...

Embodiment approach A

[0081] According to a preferred embodiment A of the present invention, the purification reactor 1 is also provided with a first gas-solid separation device 6, and the first gas-solid separation device 6 is arranged above the catalyst bed 12, more preferably arranged on The top of Reactor 1 was purged. The first gas-solid separation device 6 can prevent the adsorbent and catalyst fine powder carried in the flue gas from being discharged. The purified flue gas obtained by gas-solid separation meets the emission standards.

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Abstract

The invention relates to the field of flue gas purification, and discloses a method and a device for removing SOx and NOx in catalytic cracking flue gas. The method comprises the following steps: a) catalytic cracking flue gas containing SOx and NOx is contacted with an adsorbent to remove SOx in the catalytic cracking flue gas; and b) the catalytic cracking flue gas from which SOx is removed, a reducing gas and a catalyst are contacted to carry out a selective reduction reaction to remove NOx. The device comprises a purification reactor, a regeneration reactor and a reducing gas storage tank,wherein the purification reactor is provided with a first reaction zone and a second reaction zone; the first reaction zone is provided with a riser reactor and a settling zone; the second reaction zone is provided with a catalyst bed; the purification reactor is provided with a reducing gas inlet; an outlet of the reducing gas storage tank is communicated with the reducing gas inlet of the purification reactor; and the reducing gas inlet is formed below the catalyst bed. According to the method and the device provided by the invention, secondary discharge of wastewater or waste residues is avoided, continuous operation can be realized, and the removal effect of SOx and NOx is good.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to a method and device for removing SOx and NOx from catalytic cracking flue gas. Background technique [0002] Catalytic cracking (FCC) is the main technical means for the production of light oil products in my country. At the same time, SO x and NO x The environmental pollution caused by emissions has attracted increasing attention. The "Petroleum Refining Industry Pollutant Discharge Standard" promulgated by the Ministry of Environmental Protection stipulates the emission limit value of air pollutants for catalytic cracking units: SO 2 100mg / Nm 3 , NO x 200mg / Nm 3 , and the requirements for flue gas emissions from catalytic cracking units will be further upgraded in the future, so the full development of catalytic cracking unit SO x and NO x It is imperative to meet emission standards. [0003] Asit K.Das and others disclosed a simultaneous removal of SO x and NO x m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/56B01D53/90B01D53/50
CPCB01D53/75B01D53/90B01D53/8625B01D53/8628B01D2258/0283B01D2257/302B01D2257/404B01D2251/202B01D2251/204B01D2251/208B01D2251/2062B01D2255/20723B01D2255/20776B01D2255/20707B01D2255/20761B01D2255/20738
Inventor 张诗晓杨克勇张久顺常学良李强郭大为毛安国
Owner CHINA PETROLEUM & CHEM CORP
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