Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and device for removing sox and nox from catalytic cracking flue gas

A catalytic cracking and flue gas technology, applied in the field of flue gas purification, can solve the problems of producing waste water or waste residue, difficult to achieve continuous operation, and the removal rate needs to be further improved, so as to reduce the escape risk and avoid the effects of side reactions.

Active Publication Date: 2022-07-15
CHINA PETROLEUM & CHEM CORP +1
View PDF18 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for removing sox and nox from catalytic cracking flue gas
  • Method and device for removing sox and nox from catalytic cracking flue gas
  • Method and device for removing sox and nox from catalytic cracking flue gas

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

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

[0055] The present invention has no particular limitation on the type of reducing gas used in step b), and can 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 removal of SOx and a catalyst to perform a selective reduction reaction. The carrier gas may be air.

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

[0058] According to the present invention, the selection of the catalyst is not particularly limited, and may be a catalyst conventionally used in t...

Embodiment approach A

[0081] According to a preferred embodiment A of the present invention, the purification reactor 1 is further provided with a first gas-solid separation device 6 , and the first gas-solid separation device 6 is arranged above the catalyst bed 12 , and is further preferably arranged at 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention relates to the field of flue gas purification, and discloses a method and a device for removing SOx and NOx from catalytic cracking flue gas. The method comprises: a) contacting catalytic cracking flue gas containing SOx and NOx with an adsorbent to remove catalytic converters cracking SOx in the flue gas; b) contacting the catalytic cracking flue gas and reducing gas after removing SOx with a catalyst to perform selective reduction reaction to remove NOx. The device includes a purification reactor, a regeneration reactor and a reducing gas storage tank; 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 sedimentation zone, and the second reaction zone is provided with A catalyst bed is provided; the purification reactor is provided with a reducing gas inlet, the outlet of the reducing gas storage tank is communicated with the reducing gas inlet of the purification reactor, and the reducing gas inlet is arranged below the catalyst bed. The method and device provided by the invention have no secondary discharge of waste water or waste residue, can realize continuous operation, and have good SOx and NOx removal effect.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to a method and a device for removing SOx and NOx from catalytic cracking flue gas. Background technique [0002] Catalytic cracking (FCC) is the main technical means of producing light oil products in my country, and the catalytic cracking unit regenerates the SO of flue gas. x and NO x The environmental pollution caused by emissions is increasingly concerned. The "Petroleum Refining Industry Pollutant Emission Standard" promulgated by the Ministry of Environmental Protection of the People's Republic of China stipulates the emission limit of atmospheric pollutants from 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 catalytic cracking unit SO x and NO x It is imperative to meet emission standards. [0003] Asit K.Das et al. disclose a sim...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com