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A method for flue gas desulfurization and denitrification

A flue gas and denitrification technology, which is applied in the field of flue gas desulfurization and denitrification, can solve the problem of reducing the effective utilization rate of reducing gas, and achieve the effects of reducing the gas flow rate of the device, saving equipment investment, and improving utilization efficiency

Active Publication Date: 2022-03-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] When implementing adsorbent regeneration operation, due to the influence of factors such as mass transfer between gas and solid, the amount of reducing gas used is much greater than the theoretical amount required for regeneration of the adsorbent, resulting in a decrease in the effective utilization rate of reducing gas

Method used

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  • A method for flue gas desulfurization and denitrification
  • A method for flue gas desulfurization and denitrification
  • A method for flue gas desulfurization and denitrification

Examples

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preparation example Construction

[0085] The preparation method of reduction catalyst A is as follows: adopt citric acid method, add Fe(NO 3 ) 3 9H 2 O, ZrO(NO 3 ) and anatase TiO 2 powder such that Fe / (Fe+Zr) molar ratio is 0.6, (Fe+Zr) / TiO 2 =20wt%, then add an equimolar amount of 2mol / L citric acid, stir for 1h, then bake at 110°C for 10h until dry, and finally bake in a muffle furnace at 500°C for 3h. The catalyst is ground, pressed into tablets, and sieved to obtain the reduced catalyst B.

[0086] The preparation method of reduction catalyst B is as follows: adopt citric acid method, add Fe(NO 3 ) 3 9H 2 O, ZrO(NO 3 ) and ZSM-5 molecular sieve, so that Fe / (Fe+Zr) mol ratio is 0.6, (Fe+Zr) / ZSM-5=20wt%, then add the citric acid of 2mol / L of equimolar amount, stir 1h, then Bake at 110°C for 10h until dry, and finally bake in a muffle furnace at 500°C for 3h. The catalyst is ground, pressed into tablets, and sieved to obtain the reduced catalyst A.

Embodiment 1

[0088] use figure 1In the device and process shown, the adsorbent is conventional catalytic cracking catalyst CGP-C fresh agent (produced by Sinopec Catalyst Co., Ltd. Changling Branch), and the reduction catalyst is the above-mentioned reduction catalyst A. First put the adsorbent CGP-C fresh agent into the flue gas adsorber, and the reduction catalyst A into the reduction reactor. 520°C~580°C, pressure 4~8kPa, lifting gas is nitrogen, the first reducing gas is nitrogen and hydrogen (hydrogen volume content 2%), the molar feed amount of the first reducing gas is the flue gas adsorber The sulfur oxides and nitrogen oxides in the flue gas feed are respectively reduced to 10% of the theoretical molar total of the elemental substance, and the total storage capacity of the adsorbent in the device is 1.2kg to 1.4kg. When the test device is in the stable operation stage , The circulation rate of adsorbent is 2kg / h~3kg / h. The reduction catalyst loading capacity of the reduction rea...

Embodiment 2

[0092] The adsorbent adopts the conventional catalytic cracking catalyst CGP-C fresh agent (produced by Changling Branch of Sinopec Catalyst Co., Ltd.), and the reduction catalyst adopts reduction catalyst B. The flue gas composition, device and method are the same as in Example 1, and the experimental results are shown in Table 2.

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Abstract

The present disclosure relates to a flue gas desulfurization and denitrification method, comprising: S1, introducing an adsorbent into a flue gas adsorber to contact with the flue gas, absorbing and removing sulfur oxides and / or nitrogen oxides in the flue gas; S2, introducing Sulfur oxides and / or nitrogen oxides are absorbed by the raw adsorbent and lift gas from the bottom into the adsorbent regenerator, the first reducing gas is introduced into the adsorbent regenerator from the middle, and the desorption regeneration reaction is carried out Desorption regeneration reaction, to obtain the regenerated adsorbent and regeneration tail gas containing sulfur oxides and / or nitrogen oxides; S3, return the regenerated adsorbent to the flue gas adsorber for recycling; introduce the regeneration tail gas into the reduction reactor, Contacting and reacting with the second reducing gas in the presence of a reducing catalyst, so that reducing tail gas containing elemental sulfur and / or nitrogen is generated; S4, performing multi-stage condensation on the reducing tail gas to recover elemental sulfur to obtain purified tail gas. The method can improve the utilization efficiency of the reducing gas and can recover elemental sulfur for resource utilization on site.

Description

technical field [0001] The disclosure relates to a method for removing pollutants in industrial flue gas, in particular, to a flue gas desulfurization and denitrification method. Background technique [0002] In the catalytic cracking reaction-regeneration system, the catalyst circulates between the reactor and the catalyst regenerator. Usually, when leaving the reactor, the coke content on the ungenerated catalyst is about 3-10wt%, and the ungenerated catalyst enters the regenerator to burn and deposit The coke recovered catalytic activity, and then returned to the reactor for recycling. The coke deposited on the catalyst is mainly a reaction condensate, and its main components are carbon and hydrogen. When the cracking raw material contains sulfur and nitrogen, the coke also contains sulfur and nitrogen. Coke in the catalyst regenerator reacts with oxygen to produce CO 2 , CO and H 2 O, the regeneration flue gas also contains SO x (SO 2 , SO 3 ) and NO x (NO, NO 2 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/02B01D53/04B01D53/86B01D53/60C01B17/04C01B21/02
CPCB01D53/04B01D53/02B01D53/8637C01B17/0491C01B21/02B01D2259/40083B01D2257/302B01D2257/404B01D2257/40Y02A50/20
Inventor 郭大为武传朋张晨昕毛安国张久顺张春城王巍华腾云
Owner CHINA PETROLEUM & CHEM CORP