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Method for inhibiting low-temperature denitration catalyst poisoning caused by SO2

A low-temperature denitrification and catalyst technology, which is applied to chemical instruments and methods, separation methods, and separation of dispersed particles, can solve problems such as little consideration of impact, and achieve the effects of simple method, extended service life, and easy implementation

Active Publication Date: 2014-11-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Therefore, even if the research and development of low-temperature SCR catalysts that are currently concerned, little consideration is given to oxygen and NO in flue gas. 2 Effect on SCR denitrification reaction

Method used

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  • Method for inhibiting low-temperature denitration catalyst poisoning caused by SO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] MnO x -CuO / TiO 2 -CNTs are low-temperature denitrification catalysts, with NH 3 and NO concentrations were 800ppm, O 2 Concentration is 3%, the rest are N 2 The mixed gas is used as the simulated flue gas, and the gas injector is used to inject oxygen into the simulated flue gas, so that 50% of the NO in the flue gas is oxidized to NO 2 , and then the above containing NO 2 The flue gas takes 8000h -1 The air velocity is passed into the SCR denitrification facility, and the flue gas is denitrified and purified by passing through the above-mentioned low-temperature denitrification catalyst at 100°C, 150°C and 200°C respectively.

[0019] The denitrification test shows that the denitrification efficiencies are 29%, 48% and 80% at 100°C, 150°C and 200°C, respectively.

Embodiment 2

[0021] Same as Example 1, the difference is that SO is added to the simulated flue gas 2 gas, SO 2 The concentration is 400ppm, and other conditions remain unchanged.

[0022] In the denitrification test, it was measured that the denitrification efficiencies were 26%, 66% and 87% at 100°C, 150°C and 200°C, respectively, and remained unchanged for at least 40 hours; comparative example 1 shows that the addition of SO 2 After that, no low temperature denitrification catalyst poisoning phenomenon occurred.

Embodiment 3

[0024] The low-temperature denitrification catalyst is the same as in Example 1, and the simulated flue gas is the same as in Example 2. The simulated flue gas is directly treated with 8000h -1 The space velocity is passed into the SCR denitrification facility, and passes through the above-mentioned low-temperature denitrification catalyst at 100°C, 150°C and 200°C respectively.

[0025] In the denitrification test, it was measured that at 100°C, 150°C and 200°C, the denitrification efficiency dropped to 4%, 7% and 12% respectively. Comparative Example 2 illustrates that part of NO is oxidized to NO without spraying oxygen into simulated flue gas. 2 , the low-temperature denitrification catalyst immediately produces SO 2 poisoning, leading to a decrease in denitrification efficiency.

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Abstract

The invention discloses a method for inhibiting low-temperature denitration catalyst poisoning caused by SO2. A NO oxidation device is arranged at a flue gas inlet of a selective catalytic reduction (SCR) denitration facility, 5-70% of NO in flue gas is oxidized into NO2 by the NO oxidation device, the flue gas containing NO2 is fed into the SCR denitration facility at a space velocity of 1000-200000h<-1> and the flue gas is subjected to denitration purification at a temperature of 50-300 DEG C. Through a reaction of NO2 obtained by oxidation of NO and an ammonium salt deposited on the surface of the low-temperature denitration catalyst, the method can effectively inhibit SO2-ammonia gas reaction-caused deposition of ammonium salts such as ammonium sulfate and ammonium sulfite on the surface of the low-temperature denitration catalyst thereby inhibiting SO2-caused low-temperature SCR denitration catalyst poisoning so that a service life of the low-temperature denitration catalyst is prolonged and a SCR denitration operation cost is reduced.

Description

technical field [0001] The invention relates to a catalyst for suppressing SO 2 Poisoning method, especially related to a method for suppressing low-temperature denitrification catalyst SO 2 poisoning method. Background technique [0002] Nitrogen oxides (including NO and NO 2 , referred to as NO X ) is one of the most important air pollutants today, NO X The resulting acid rain and photochemical smog have serious impacts on soil and water ecosystems. In addition, NO X It also causes the greenhouse phenomenon and destroys the ozone layer, directly endangering human health. my country, as a developing country mainly burning coal, with the rapid development of economy, NO X Pollution is getting worse. In 2010, the emission of nitrogen oxides from coal-fired power plants in China alone reached more than 10 million tons, making it the largest NOx in the world. X emitter country. At the beginning of 2013, smog weather appeared in many places in China, especially in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/76B01D53/90
Inventor 周东升杨杭生马朝霞李博张孝彬
Owner ZHEJIANG UNIV
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