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A kind of additive for improving the ammonia activity of sncr and its application

An additive and active technology, applied in the field of flue gas SNCR denitrification, can solve the problems of limited application, shutdown, poor operation stability, etc., and achieve the effect of increasing denitrification efficiency

Active Publication Date: 2016-02-03
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • 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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  • A kind of additive for improving the ammonia activity of sncr and its application
  • A kind of additive for improving the ammonia activity of sncr and its application
  • A kind of additive for improving the ammonia activity of sncr and its application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 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

[0046] Table 1 The ratio of additives and denitrification situation

[0047]

[0048] Among them, the enol is 3-methyl-1-penten-4-yn-3-ol, and the inorganic sodium salt is NaHCO 3 .

Embodiment 2

[0050] 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

[0051] Table 2 The ratio of additives and the denitrification situation

[0052]

[0053] Among them, the enol is 3,7-dimethyl-6-octen-1-yn-3-ol, and the inorganic sodium salt is Na 2 CO 3 .

Embodiment 3

[0055] 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

[0056] Table 3 The ratio of additives and denitrification situation

[0057]

[0058] Wherein, the enol is 2-methyl-3-buten-2-ol, and the inorganic sodium salt is NaCl.

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Abstract

The invention discloses an additive for increasing SNCR ammonia activity, and an application thereof. The additive consists of enols, inorganic sodium salts and KOH. The additive and a denitration reducing agent are mixed, then the mixture is spayed into flue gas, and the temperature range of the flue gas is from 760 to 850 DEG C. In the temperature range of 760 to 850 DEG C, a mixture obtained by mixing a little of the enols, the sodium salts and KOH into aqua ammonia or urea solution is sprayed into the flue gas and is denitrated. The additive can adapt to the change of different oxygen concentrations, helps to reduce the N2O by-product formation, and enables the denitration efficiency to reach 40%-80%. Compared with a conventional SNCR denitration method, the method provided by the invention enables the effective denitration temperature range to be extended, the permitting oxygen concentration range to be extended, and the ammonia escape to be 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 王岳军寿冬金莫建松李世远梁平吴忠标
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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