Additive for denitration of smoke SNCR (selective non-catalytic reduction) and application thereof

An additive and denitrification technology, which is applied in the field of flue gas SNCR denitrification, can solve the problems of shutdown, limited application, poor operation stability, etc., achieve the expansion of effective denitrification temperature range, improve utilization rate, and reduce the generation of by-product N2O Effect

Active Publication Date: 2015-02-25
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned SNCR patents have been applied in a certain range in industry, but the best denitrification activity of the existing additives is above 850°C. There are many types of boilers in my country, and the operation stability is not good, and the flue gas temperature is often lower than 800°C, even below 760°C, will cause the shutdown of the SNCR denitrification system, which limits the application of SNCR technology. Therefore, the development of a denitrification additive for improving the denitrification activity at 760-850°C and reducing ammonia escape has a wide range of applications. Application prospects

Method used

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  • Additive for denitration of smoke SNCR (selective non-catalytic reduction) and application thereof
  • Additive for denitration of smoke SNCR (selective non-catalytic reduction) and application thereof
  • Additive for denitration of smoke SNCR (selective non-catalytic reduction) and application thereof

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Experimental program
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Effect test

Embodiment 1

[0040] The flue gas temperature is 760°C, the reducing agent is ammonia water (5% mass concentration), and the NSR is 1.2. The additive content and measurement results are shown in Table 1

[0041] Table 1 The ratio of additives and denitrification situation

[0042]

[0043] Among them, the cellulose ether is hydroxymethyl cellulose, and the inorganic sodium salt is NaHCO 3 .

Embodiment 2

[0045] The flue gas temperature is 800°C, the reducing agent is ammonia water (5% mass concentration), and the NSR is 1.2. The additive content and measurement results are shown in Table 2

[0046] Table 2 The ratio of additives and the denitrification situation

[0047]

[0048] Among them, the cellulose ether is hydroxyethyl cellulose, and the inorganic sodium salt is Na 2 CO 3 .

Embodiment 3

[0050] The flue gas temperature is 850°C, the reducing agent is ammonia water (5% mass concentration), and the NSR is 1.2. The additive content and measurement results are shown in Table 3

[0051] Table 3 The ratio of additives and denitrification situation

[0052]

[0053] Among them, the cellulose ether is hydroxypropyl cellulose, and the inorganic sodium salt is NaCl.

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Abstract

The invention discloses an additive for denitration of smoke SNCR (selective non-catalytic reduction) and application thereof. The additive comprises cellulose ether and inorganic sodium salt; and the additive and the denitration reductant are mixed and then sprayed into the smoke, and the temperature interval of the smoke is between 760 DEG C and 850 DEG C. The mixture of ammonia water or urea solution containing little cellulose ether and sodium salt is sprayed into the smoke at the temperature interval of 760-850 DEG C for denitration, the additive can be adapt to different oxygen concentration changes, the generation of byproduct N2O is reduced, and the denitraiton efficiency achieves 40%-70%. Compared with the SNCR denitration method, effective denitraiton temperature area is enlarged, allowable oxygen uptake range is widened, and escaped ammonia is reduced.

Description

technical field [0001] The invention relates to the field of flue gas SNCR denitrification, in particular to a denitrification additive for improving low-temperature denitrification activity in SNCR flue gas denitrification and reducing ammonia escape and application thereof. Background technique [0002] At present, the NOx emission control technology at home and abroad can be roughly divided into two categories: one is low NOx combustion technology, that is, through the optimization of boiler operation mode or the control of combustion process, the reaction formation of NOx in the combustion process is suppressed, thereby reducing the final emission of NOx concentration. The other is flue gas denitrification technology, that is, reducing the generated NOx to N 2 , so as to remove NOx in flue gas, there are mainly selective non-catalytic reduction technology SNCR and selective catalytic reduction technology SCR. [0003] Selective Non-Catalytic Reduction (SNCR) is a matur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/79B01D53/56
CPCY02C20/10
Inventor 吴忠标寿冬金王岳军莫建松李世远
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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