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A sncr denitrification system applied to small boilers

A small boiler and boiler technology, applied in the field of SNCR denitrification system, can solve the problems of reducing agent reaction and denitrification efficiency reduction, and achieve the effect of improving denitrification efficiency

Active Publication Date: 2021-12-21
杭州宁骏科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the large temperature fluctuations in the denitration reaction zone in the furnace will cause the reducing agent sprayed into the furnace to often fail to react with NOx in a suitable temperature window, which will greatly reduce the denitration efficiency

Method used

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  • A sncr denitrification system applied to small boilers
  • A sncr denitrification system applied to small boilers
  • A sncr denitrification system applied to small boilers

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Embodiment 1

[0038] Embodiment one, refer to figure 1 , is an SNCR denitrification system applied to small boilers disclosed in the present invention, including a boiler 1, and an open flame area 2 is arranged in the boiler 1, and the open flame area 2 is a place where an open flame can be seen in the boiler 1, and the open flame area 2 is along the flue gas flow direction It includes an open flame front section 21 and an open flame tail section 22 in sequence.

[0039] Wherein, the suitable temperature for denitrification of the reducing agent in the boiler 1 is between 850-1100°C. During the load change of the small boiler 1, because the flue gas flows along the boiler 1, its temperature will continue to decrease, and the rate of decrease will first increase and then decrease, that is to say, the area with the smallest and most constant temperature change At the beginning of the flue gas (that is, the open flame area 2) and the tail section of the boiler 1. However, the temperature of ...

Embodiment 2

[0050] Embodiment two, refer to figure 2 , The only difference with Embodiment 1 is that there is no return air pipe 62 and circulating air pump 63, and a water tank 3, a water delivery pipe 64, and a water delivery pump 65 are provided.

[0051] The water tank 3 is arranged outside the boiler 1 , the water delivery pipe 64 communicates with the cooling spray gun 6 and is located between the outer end of the boiler 1 and the water tank 3 , and the water delivery pump 65 is installed on the water delivery pipe 64 .

[0052] The implementation principle of this embodiment is: by spraying urea into the tail section 22 of the open flame to improve the denitrification efficiency; at the same time, through the following two methods, the temperature after the urea temperature rises and decomposes is as close as possible to the suitable temperature range of the denitrification reaction, thereby improving denitrification efficiency. First, several ring pipes 23 at different ambient t...

Embodiment 3

[0053] Embodiment three, refer to image 3 , The only difference with Embodiment 1 is that a water tank 3, a water delivery pipe 64, and a water delivery pump 65 are added.

[0054] The water tank 3 is located outside the boiler 1 , the water delivery pipe 64 communicates with the cooling spray gun 6 and is located between the outer end of the boiler 1 and the water tank 3 , and the water delivery pump 65 is installed on the water delivery pipe 64 .

[0055] The implementation principle of this embodiment is: by spraying urea into the tail section 22 of the open flame to improve the denitrification efficiency; at the same time, through the following two methods, the temperature after the urea temperature rises and decomposes is as close as possible to the suitable temperature range of the denitrification reaction, thereby improving denitrification efficiency. First, a plurality of ring pipes 23 at different ambient temperatures are provided, and appropriate ring pipes 23 are ...

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Abstract

The invention relates to an SNCR denitrification system applied to a small boiler, and relates to the technical field of flue gas denitrification, but the large temperature fluctuation of the denitrification reaction zone in the furnace will cause the reductant sprayed into the furnace to be unable to meet the temperature requirements in a suitable temperature window. NOx reaction, which leads to a great reduction in denitrification efficiency. This scheme includes a boiler with an open flame area inside the boiler; a reducing agent liquid inlet part is pierced on the boiler wall, and the open flame area includes the front section of the open flame and the tail section of the open flame in sequence along the flue gas flow direction, and the liquid inlet part of the reducing agent is connected to the tail section of the open flame A liquid storage tank and a gas storage tank are arranged outside the boiler, and urea solution is stored in the liquid storage tank, the reducing agent liquid inlet part is connected with the liquid storage tank, and the reducing agent liquid inlet part is connected with the gas storage tank. By spraying urea into the tail section of the open flame, the denitrification efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to an SNCR denitrification system applied to small boilers. Background technique [0002] Selective non-catalytic reduction (SNCR) refers to the reduction of nitrogen oxides in the flue gas to harmless nitrogen and water by spraying a reducing agent in the "temperature window" suitable for denitrification reaction without the action of a catalyst. This technology generally uses ammonia, urea or hydrogen acid in the furnace as a reducing agent to reduce NOx. The reducing agent only reacts with NOx in the flue gas, and generally does not react with oxygen. [0003] Among them, since the process does not use a catalyst, it is necessary to add a reducing agent in the high temperature zone (appropriate temperature window). [0004] However, for small and medium-sized boilers, the internal temperature fluctuations are relatively large, resulting in relatively large tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/79B01D53/56
CPCB01D53/56B01D53/78B01D53/79B01D2258/0283
Inventor 吕晓宁
Owner 杭州宁骏科技有限公司
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