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Method for removing NO (nitric oxide) in flue gas

A flue gas and removal technology, applied in the field of NO removal, can solve the problems of increased investment and operating costs, low NO removal rate, catalyst pollution, etc., achieve wide reaction temperature range, high NO removal rate, and low operating costs Effect

Active Publication Date: 2012-08-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are also some defects in the above-mentioned methods for removing NO in flue gas. The NO removal method using ammonia as the reducing agent generally uses ammonia and urea or urea aqueous solution as the source of the reducing agent. If the injected ammonia Or too much urea, will lead to the so-called ammonia breakthrough, the emitted ammonia is more harmful than the emitted NOx, too much ammonia may lead to the formation of NOx through oxidation, another disadvantage is that they have to be stored for regular Supplement, especially ammonia, has high requirements for safety and environmental protection in the process of transportation and storage, which will inevitably lead to increased investment and operating costs of this technology; moreover, the catalyst used in the process will also be washed by high concentrations of smoke, wear and impurities in fly ash pollution, the high flue gas temperature will also cause sintering and deactivation of the catalyst, SO 2 Presence can lead to a rapid decline in catalyst activity
[0004] Using hydrocarbons as reducing agents to remove NO in flue gas requires cracking hydrocarbons; catalytic oxidation requires oxidation and lye absorption; ozonation requires a special ozone generator, which is then absorbed after oxidation; the process is complicated and the cost of NO removal is high ; and adding removal agent in the catalytic cracking process also has the problems of low NO removal rate and dilution of the FCC main catalyst

Method used

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  • Method for removing NO (nitric oxide) in flue gas
  • Method for removing NO (nitric oxide) in flue gas
  • Method for removing NO (nitric oxide) in flue gas

Examples

Experimental program
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Effect test

Embodiment 1

[0022] 133g of chemically pure Ce(NO) produced by Tianjin BASF Chemical Co., Ltd. 3 ) 3 ·6H 2 O (purity ≥95%), 205g chemically pure CuCl produced by Tianjin BASF Chemical Co., Ltd. 2 ·3H 2 O (purity ≥95%) was added to 400g of deionized water at 70°C in turn, stirred for 2 hours to completely dissolve it, continued stirring, and added 406g of industrial grade pseudo-boehmite produced by Shandong Aluminum Co., Ltd. Purity ≥ 98.5%), stir for 3 hours, then add 256g of industrial-grade aluminum sol (Al 2 O 3 Dry basis is 19.5%) and 89g industrial grade silica sol (SiO) produced by Mengjin Petrochemical Plant 2 Dry basis 28.0%), continue to stir for 5 hours to obtain a slurry; at a furnace temperature of 350°C, an outlet temperature of 200°C, and a spray pressure of 35 atmospheres, the resulting slurry is spray-dried and molded, and the resulting pellets are heated at 130°C Dry in a drying box for 6 hours, and calcinate in a muffle furnace at 580°C for 7 hours to obtain an intermediate...

Embodiment 2

[0024] 179g of chemically pure CeCl produced by Tianjin BASF Chemical Co., Ltd. 2 ·7H 2 O (purity ≥96%), 112g chemically pure Cu(NO) produced by Tianjin BASF Chemical Co., Ltd. 3 ) 2 ·3H 2 O (purity ≥ 95%) was added to 400g of deionized water at 70°C in turn, stirred for 2 hours to dissolve completely, continue to stir, add 393g of pseudo-boehmite of the same origin and grade as in Example 1, and stir for 3 After hours, add 513 g of aluminum sol of the same origin and grade as in Example 1, and the remaining steps are the same as in Example 1, to obtain an intermediate product. Take 200 g of the intermediate product, 10 g of the same Pd solution as in Example 1, and the remaining steps are the same as in Example 1, to obtain the target product B. The physical and chemical properties are shown in Table 1.

Embodiment 3

[0026] Add 66g of Ce(NO) of the same origin and grade as in Example 1. 3 ) 3 ·6H 2 O, 68g CuCl with the same origin and grade as in Example 1 2 ·4H 2 O was added to 400g of deionized water at 70°C in sequence, stirred for 2 hours to make it completely dissolved, continue to stir, add 541g of pseudo-boehmite of the same origin and grade as in Example 1, stir for 3 hours, and then add 179g A silica sol of the same origin and grade as in Example 1, and the remaining steps are the same as in Example 1, to obtain an intermediate product. Take 200 g of the intermediate product, 3.5 g of the same Pd solution as in Example 1, and the remaining steps are the same as in Example 1, to obtain the target product C. The physical and chemical properties are shown in Table 1.

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PUM

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Abstract

The invention discloses a method for removing NO (nitric oxide) in flue gas. Gas containing the NO flows through a reactor with the reaction temperature ranging from 400 DEG C to 800 DEG C at airspeed of 1000-10000h-1, from 10 to 40% of main catalyst, from 5 to 30% of auxiliary catalysts and from 30 to 70% of activated carbon are filled in the reactor by total weight of catalyst, and shortcomings that NO removal rate is low and a removal process is complex in the prior art are overcome.

Description

Technical field [0001] The invention relates to a method for removing NO, in particular to a method for removing NO from flue gas by selective catalytic reduction. Background technique [0002] At present, the methods for removing NO in flue gas can be divided into selective catalytic reduction and selective non-catalytic reduction. Selective catalytic reduction is the selective reduction of NO to N with a suitable reducing agent under the action of a catalyst at a lower temperature 2 ; The principle of selective non-catalysis is to selectively reduce NO to N with a reducing agent at a higher temperature 2 . In comparison, selective catalytic reduction is widely used due to its low operating temperature and high NO removal efficiency. In the selective catalytic reduction, according to the different reducing agents, it can be divided into ammonia selective catalytic reduction of NO (NH 3 -SCR), hydrocarbon selective catalytic reduction of NO (HC-SCR) and carbon monoxide selective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/94B01D53/56
CPCY02C20/10
Inventor 齐文义袁强黄新龙郝代军秦如意王龙延刘淑芳王洪彬王少锋胡艳芳赵智刚
Owner CHINA PETROLEUM & CHEM CORP
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