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SCR (Selective Catalytic Reduction) reactor, catalyst and preparation method of catalyst

An SCR reactor and catalyst technology, applied in the field of flue gas denitrification, can solve the problems of reduced work efficiency, increased ammonia injection, catalyst deactivation, etc., to reduce the conversion generation rate, reduce the generation of NH4HSO4, reduce the generation of SO3 Effect

Inactive Publication Date: 2022-06-03
DATANG ENVIRONMENT IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with deep peak regulation, the load of the power plant will drop, sometimes even to 20%. At this time, the temperature of the flue gas will drop sharply, and the working efficiency of the SCR will decrease. x removal efficiency, at this time, it is necessary to increase the amount of ammonia injection, and at the same time, part of the SO 2 Oxidized by the catalyst to SO 3 , SO 3 with NH 3 combined to form NH 4 HSO 4 , at lower flue gas temperatures, NH 4 HSO 4 Condensation will cause blockage of the catalyst, resulting in catalyst deactivation

Method used

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  • SCR (Selective Catalytic Reduction) reactor, catalyst and preparation method of catalyst
  • SCR (Selective Catalytic Reduction) reactor, catalyst and preparation method of catalyst
  • SCR (Selective Catalytic Reduction) reactor, catalyst and preparation method of catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0048] S11, dissolving manganese nitrate, zirconium nitrate and cerium nitrate with a molar ratio of 1:1:2 in water to form a metal salt solution;

[0049] S12. Add tetraethylamine oxalate and citric acid in a molar ratio of 1:1.5 to the metal salt solution, and keep stirring at 80°C for 2 hours. The molar ratio of amine and water remains unchanged, at this time, the temperature is raised to 95°C until a gel is formed;

[0050] S13. Put the gel in an oven at 120°C for 3 hours, grind and sieve the catalyst particles of 200-500 μm, then place the powder in a muffle furnace, and calcinate at 700°C for 3 hours in an air atmosphere to obtain sulfur-resistant Mn doping Ce / Zr solid solution catalyst.

Embodiment 2

[0052] S21, dissolving manganese nitrate, zirconium nitrate and cerium nitrate with a molar ratio of 1:1:2 in water to form a metal salt solution;

[0053] S22. Add tetraethylamine oxalate and citric acid in a molar ratio of 1:1.5 to the metal salt solution, and heat and stir at 70°C for 3 hours. After the heat preservation and stirring are completed, metal nitrate, citric acid, and tetraethyl oxalate The molar ratio of amine and water remains unchanged, at this time, the temperature is raised to 100°C until a gel is formed;

[0054] S23. Put the gel in an oven at 110°C for 4 hours, grind and sieve the catalyst particles of 200-500 μm, then place the powder in a muffle furnace, and calcinate at 800°C for 2 hours in an air atmosphere to obtain sulfur-resistant Mn doping Ce / Zr solid solution catalyst.

Embodiment 3

[0056] S31, dissolving manganese nitrate, zirconium nitrate and cerium nitrate with a molar ratio of 1:1:2 in water to form a metal salt solution;

[0057] S32. Add tetraethylamine oxalate and citric acid in a molar ratio of 1:1.5 to the metal salt solution, and heat and stir at 90°C for 1 hour. After the heat preservation and stirring are completed, metal nitrate, citric acid, and tetraethyl oxalate The molar ratio of amine and water remains unchanged, and at this time, the temperature is raised to 90°C until a gel is formed;

[0058] S33. Put the gel in an oven at 130°C for 2 hours, grind and sieve the catalyst particles of 200-500 μm, then place the powder in a muffle furnace, and calcinate at 600°C for 2 hours in an air atmosphere to obtain sulfur-resistant Mn doping Ce / Zr solid solution catalyst.

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Abstract

The invention relates to the technical field of flue gas denitration, in particular to an SCR (Selective Catalytic Reduction) reactor, a catalyst and a preparation method thereof, the SCR reactor comprises multiple layers of catalysts and an ammonia spraying grid which are sequentially arranged in parallel, and the ammonia spraying grid is arranged between the first layer of catalyst and the second layer of catalyst; wherein the first-layer catalyst is a sulfur-resistant Mn-doped Ce / Zr solid solution catalyst. When flue gas enters the first-layer catalyst, NO in part of the flue gas can be catalytically oxidized into NO2 (NO + 1 / 2O2-> NO2) by the sulfur-resistant Mn-doped Ce / Zr solid solution catalyst, and when ammonia is sprayed at the second-layer catalyst, a rapid SCR reaction is generated. Besides, the sulfur-resistant Mn-doped Ce / Zr solid solution catalyst can reduce the conversion generation rate of SO3 at the same time, so that the generation amount of SO3 is reduced, the effect of reducing generation of NH4HSO4 is finally achieved, and the problem that the denitration efficiency of the catalyst is reduced due to blockage of the catalyst is solved.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to an SCR reactor, a catalyst and a preparation method thereof. Background technique [0002] At present, coal still occupies the main position of my country's primary energy consumption, and ultra-low emission of coal-fired power plants is the current mainstream trend. A large amount of nitrogen oxides (NO x ), NO x It is one of the important precursors of smog, which can lead to acid rain, photochemical smog and the destruction of the ozone layer, and at the same time cause direct harm to the human respiratory system. [0003] Selective Catalytic Reduction (SCR) is the most commonly used flue gas denitrification technology for thermal power units. The SCR device converts NO at a suitable temperature x with reducing agent NH 3 Catalyst reaction to N 2 and H 2 O, however, once the catalyst is deactivated, the working efficiency of the SCR will decrease. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01J23/34
CPCB01D53/8628B01J23/34B01J23/002B01J2523/00B01D2257/404B01D2258/0283B01J2523/3712B01J2523/48B01J2523/72Y02T10/12
Inventor 岳朴杰孟磊谷小兵白玉勇袁照威宁翔杜明生王力光曹书涛
Owner DATANG ENVIRONMENT IND GRP
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