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Method for reducing NOx emission in FCC (Fluid Catalytic Cracking) regeneration process

A regeneration process and regenerator technology, applied in separation methods, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high cost and poor denitration adaptability, and achieve the effects of low cost, easy operation and simple denitration process.

Inactive Publication Date: 2012-12-19
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the invention is to provide a method for reducing NO in the regeneration process of FCC x The emission method, which is used to solve the problems of high cost and poor denitrification adaptability of the existing flue gas denitrification method

Method used

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  • Method for reducing NOx emission in FCC (Fluid Catalytic Cracking) regeneration process
  • Method for reducing NOx emission in FCC (Fluid Catalytic Cracking) regeneration process
  • Method for reducing NOx emission in FCC (Fluid Catalytic Cracking) regeneration process

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Preparation of fly ash-based denitration catalyst:

[0039] to combine image 3 As shown, the method of using fly ash to prepare fly ash-based denitrification catalyst: collect fly ash from the site, grind it into subdivisions, pass through a 40-mesh sieve, take 50g of fly ash and place it in a muffle furnace, and heat it at 600°C Calcined at high temperature for 10h, washed with water at 60°C for 2.5h, filtered and dried, added 2mol / L dilute hydrochloric acid with a volume of 500ml to wash, and the two reacted at a temperature of 50°C and a rotor of 100r / min. After reacting for 6 hours, the acid solution and the fly ash were separated into solid and liquid, and the separated solid was washed with distilled water until it was neutral, and dried for later use. Mix the treated fly ash with 40% NaOH solution at a solid-to-liquid ratio of 1:5, calcinate at 450°C for 1 h, and take it out to room temperature for later use. Then, the calcined fly ash was hydrothermally synth...

Embodiment 2

[0045] Preparation of fly ash-based denitration catalyst:

[0046] Collect fly ash from the site, grind it into subdivisions, pass through a 40-mesh sieve, put 50g of fly ash in a muffle furnace, calcinate at 700°C for 8 hours, wash with water at 20°C for 4 hours, and filter and dry Finally, add 2mol / L dilute hydrochloric acid with a volume of 600ml to wash, and the two react at a temperature of 40°C and a rotor of 200r / min for 2 hours, and then separate the acid solution from the fly ash solid-liquid, and the solid Wash with distilled water until neutral, dry for later use. Mix the treated fly ash with 40% NaOH solution at a solid-to-liquid ratio of 1:1, calcinate at 600°C for 2 h, and take it out to room temperature for later use. Then, the calcined fly ash was hydrothermally synthesized at a temperature of 100°C and a synthetic pressure of 0.5Mpa for 4h, aged at 40°C for 2h, crystallized at 110°C for 24h, and the synthesized sample was washed and filtered with distilled wa...

Embodiment 3

[0051] Preparation of fly ash-based denitration catalyst:

[0052] Collect fly ash from the site, grind it into subdivisions, pass through a 40-mesh sieve, put 50g of fly ash in a muffle furnace, calcinate at 900°C for 6 hours, wash with water at 80°C for 1 hour, filter and dry Finally, add 4mol / L dilute sulfuric acid with a volume of 750ml to wash, and the two react at a temperature of 20°C and a rotor of 300r / min for 10 hours, and then separate the acid solution from the fly ash solid-liquid, and the solid after separation Wash with distilled water until neutral, dry for later use. Mix the treated fly ash with 40% NaOH solution at a solid-to-liquid ratio of 1:10, calcinate at 500°C for 1.5 h, and then take it out to room temperature for later use. Then, the calcined fly ash was hydrothermally synthesized at a temperature of 95°C and a synthesis pressure of 0.2Mpa for 8 hours, aged at 50°C for 4 hours, crystallized at 120°C for 18 hours, and the synthesized samples were wash...

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Abstract

The invention relates to a method for reducing NOx emission in an FCC (Fluid Catalytic Cracking) regeneration process. The method for reducing NOx emission in an FCC regeneration process comprises the following steps of: adding a fly ash based denitration catalyst manufactured by using fly ash as a raw material into an FCC regenerator, wherein the adding quantity of the catalyst is 5% of the mass of a reactant in the FCC regenerator, petroleum coke attached to the surface or duct of the catalyst generates the gases of NOx, CO2, H2O, CO and SO2 in the combustion process, NOx and reducing gas CO directly carry out a chemical in-situ reaction of the fly ash based denitration catalyst, and the NOx is reduced into N2; while the in-situ catalytic reduction effect on the fly ash based denitration catalyst is carried out, returning regeneration flue gas in 20%-40% volume of the flue gas discharge capacity into the FCC regenerator by using an air blower, the flue gas returned into the FCC regenerator carries out a chemical in-situ reaction again of the fly ash based denitration catalyst, the NOx returned into the flue gas is reduced into N2, so that low NOx emission is realized. The reducing gas is completely provided by petroleum coke at the in-situ combination of the catalyst so that the concentration of the regeneration flue gas NOx is decreased by 50%-80%, and simultaneously the energy consumption can be decreased by 10%-30%.

Description

[0001] 1. Technical field: [0002] The invention relates to the fields of solid waste resource utilization and gas pollution control, and specifically relates to a method for reducing NO in the regeneration process of FCC. x method of emission. 2. Background technology: [0003] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere. It easily forms nitric acid rain and photochemical smog in the air, destroys the ozone layer, seriously affects the ecological environment and endangers human health. With the improvement of environmental protection regulations and the improvement of people's environmental awareness, NO x Emission standards will become higher and higher. Fluid catalytic cracking is an important means of secondary processing in petroleum refineries, and NO x Emissions accounted for refinery NO x More than 50% of the total emissions, accounting for about NO in the air x 10% of the total emissions, although its NO x The amount of emission is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01J29/76
Inventor 陈彦广韩洪晶陆佳宋华陈颖李杰
Owner NORTHEAST GASOLINEEUM UNIV
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