Method for realizing denitration in solid-gas conversion furnace and use equipment of method

A reformer and denitrification technology, which is applied to chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as increased operating costs, easy poisoning of catalysts, and performance degradation of air preheaters, and overcomes the need for large investment in catalysts and overcoming The effect of high reaction temperature and improved mixing uniformity

Inactive Publication Date: 2019-01-18
李晓龙
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The denitration reaction temperature of SCR technology is generally 280 ℃ ~ 400 ℃, and the denitration efficiency is over 90%. There are also some problems in SCR technology: first, the system occupies a large area, and the equipment investment and operating costs are relatively high
Third, ammonia leakage and the resulting accumulation of ammonium sulfate will lead to a decrease in the performance of the air preheater
Fourth, the core component of SCR - the catalyst is particularly prone to poisoning, which seriously affects the normal use of the denitrification system and increases operating costs
[0006] The reaction temperature of SNCR technology is generally between 850°C and 1100°C, and the denitrification efficiency is medium, generally around 30%-80%. The disadvantage of SNCR technology is that it is greatly affected by the size of the boiler structure. As a supplementary treatment method for low-nitrogen combustion technology, SNCR has high requirements for flue gas temperature, and temperature fluctuations will directly affect the denitrification effect of the system
[0007] At present, SCR and SNCR are the two most widely used technologies, but these two technologies cannot meet the new national environmental protection requirements.
The combined technology of SCR+SNCR increases the project investment cost

Method used

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  • Method for realizing denitration in solid-gas conversion furnace and use equipment of method
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  • Method for realizing denitration in solid-gas conversion furnace and use equipment of method

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Embodiment 1

[0042] like figure 1 As shown, a method for denitrification in a solid-gas reformer provided in this embodiment includes the following steps:

[0043] Firstly, the solid denitrification substance is converted into a gaseous substance through a heating gasification system; the solid denitrification substance includes a solid substance that can be gasified by heating to a certain temperature and has a denitrification effect, and the solid denitrification substance includes urea;

[0044] Then, the gaseous denitrification substance is sprayed into the furnace denitrification zone 5 inside the boiler 1, and fully mixed and reacted with the flue gas to be treated.

[0045] In this embodiment 1, if figure 1 As shown, the solid denitrification agent urea CON2H4 is heated to 160°C-1000°C to gasify and then mainly decomposes into ammonia NH3, which is sprayed into the furnace denitrification zone 5 inside the boiler 1 to react with nitrogen oxides in the flue gas to form Nitrogen and...

Embodiment 2

[0053] Embodiment 2: Adopt the supporting equipment of the method for denitrification in the solid-gas reformer of the present invention, such as figure 2 As shown, the combination of several spraying points 8, the first spray gun device 6, and the second spray gun device 7 presents a grid-like and or regular layer network arrangement, and the spraying points 8 are arranged horizontally in multiple rows, and the spraying points 8 rows arranged longitudinally.

Embodiment 3

[0054] Embodiment 3: Adopt the supporting equipment of the method for denitrification in the solid-gas reformer of the present invention, such as image 3 As shown, several spraying points 8, some first spray gun devices 6, and several second spray gun devices 7 are combined into a jet net layer 16, and a plurality of jetting points 8 on the jet net layer 16 are multi-layered. regular grid arrangement.

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Abstract

The invention discloses a method and equipment for realizing denitration in a solid-gas conversion furnace, belonging to the technical field of the boiler flue gas denitration. The method comprises the following steps: converting a solid-state denitration substance such as urea into a gas-state substance by virtue of a heating gasifying system; and spraying the gas-state denitration substance intoan in-furnace denitration region in a boiler to adequately mix the gas-state substance with to-be-treated flue gas for reaction. The urea is further heated to be gasified through heat of the boiler,and a temperature adjusting protection part connected with a second draught fan is utilized for adjusting the heating temperature in a gasifying region and protecting pipelines distributed in the boiler, so that the pipelines are not damaged and deformed due to the high temperature in the boiler; and the flue gas lower than 850 DEG C is denitrated in the boiler, so that compared with the prior art, the efficiency is remarkably improved, the denitration cost is lowered, and the environmental protection is promoted.

Description

technical field [0001] The invention relates to a method for denitrification in a solid-gas reformer, in particular to a method and equipment for denitrification in a solid-gas reformer, and belongs to the technical field of boiler flue gas denitrification. Background technique [0002] At present, with the development of the global economy, the environmental pollution caused by massive energy consumption cannot be underestimated. Among them, atmospheric smoke, acid rain, greenhouse effect and the destruction of the ozone layer have become the four major killers that endanger the harmonious coexistence of human beings and the biological world. [0003] my country is a large developing country with coal as one of the main energy sources. Harmful substances such as soot, sulfur dioxide, and nitrogen oxides contained in coal-burning flue gas have caused serious air pollution. In my country, harmful substances such as sulfur dioxide and nitrogen oxides are mainly produced by co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/76C10J3/72
CPCB01D53/56B01D53/76B01D2258/0283C10J3/72
Inventor 李晓龙
Owner 李晓龙
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