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Anti-ash-blocking ammonium bisulfate vaporizing and heating device for SCR denitrification unit air preheater

A heating device, ammonium hydrogen sulfate technology, applied in lighting and heating equipment, safety devices of combustion chambers, indirect carbon dioxide emission reduction, etc. Strict requirements, etc.

Pending Publication Date: 2018-01-19
北京启创天工电力技术应用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] SCR (Selective Catalytic Reduction) is a selective catalytic reduction technology, which has developed rapidly in recent years. At present, the ammonia catalytic reduction method is the most widely used technology. It has no by-products, does not form secondary pollution, and has a simple device structure. High removal efficiency (up to 90%), reliable operation, easy maintenance, etc., but for SCR flue gas denitrification, ammonia and nitrogen oxides cannot be completely mixed, and escape is inevitable. When the escape rate exceeds the standard, ammonia gas React with sulfur trioxide to generate ammonium bisulfate to block the air preheater
Due to its special physical properties, ammonium bisulfate is very easy to adsorb and stick to the heat exchange elements of the air preheater, and it is difficult to remove it by conventional steam soot blowing and shock wave soot blowing
The current solution is online high-pressure water flushing. Since the flushing is performed during the operation of the unit, it has a great impact on the safety of the air preheater and the subsequent electrostatic precipitator. It is very easy to cause the air preheater to trip due to large current fluctuations, which poses a greater safety risk. , the requirements for equipment and unit working conditions are more stringent, and it is easy for the current fluctuation of the air preheater to exceed the rated value, and the effect of reducing the pressure difference is not obvious

Method used

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  • Anti-ash-blocking ammonium bisulfate vaporizing and heating device for SCR denitrification unit air preheater
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  • Anti-ash-blocking ammonium bisulfate vaporizing and heating device for SCR denitrification unit air preheater

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Embodiment 1

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] like figure 1 , figure 2 , image 3 As shown, a kind of SCR denitration unit air preheater anti-clogging ash ammonium bisulfate vaporization heating device provided in this embodiment includes an air preheater 1, which is characterized in that it also includes:

[0030] Air duct 2, the air duct 2 is connected to the cold end of the air preheater 1, and the air duct 2 is connected with a plurality of diversion partitions 2-1 near the end of the air preheater 1;

[0031] A heating device 3, the combustion heating device 3 is connected to the side end of the air duct 2.

[0032] In order to facilitate the introduction of the heated hot air into the air duct 2 and facilitate the observation of the combustion situation in the combustion chamber 3-1, the embodiment of the present invention is that the heating device 3 includes a combustion chamber 3-1 located at i...

Embodiment 2

[0043] Embodiment 2 is the same as embodiment 1 and will not repeat them, such as Figure 5 , Figure 6 , the difference is that it also includes an oxygen-enriched pipeline 8, and the oxygen-enriched pipeline 8 includes an annular pipeline 8-1 connected to the inner cavity of the combustion chamber 3-1, and the annular pipeline 8-1 is away from the combustion chamber. The inner cavity end of the chamber 3-1 is provided with a plurality of circumferentially distributed holes, and the annular pipeline 8-1 is connected with a second pipeline 8-2 near the inner cavity end of the combustion chamber 3-1, and the second The pipeline 8-2 runs through the side end of the combustion chamber 3-1 and is connected to the oxygen enrichment equipment.

[0044] In order to facilitate the image flame detector 3-2 to fully observe the flame in the oxygen-enriched state, the embodiment of the present invention is that the oxygen-enriched pipeline 8 is connected to the rear end of the image fla...

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Abstract

The invention provides an anti-ash-blocking ammonium bisulfate vaporizing and heating device for an SCR denitrification unit air preheater. The anti-ash-blocking ammonium bisulfate vaporizing and heating device comprises the air preheater and is characterized by further comprising an air duct and a heating device; the air duct is connected to the cold end of the air preheater, and multiple flow guide partitions are arranged at the end, close to the air preheater, in the air duct; and the heating device is connected to the side end of the air duct, the heating device comprises a combustion chamber arranged at the front end of the heating device, the front end of the combustion chamber is connected with the air duct, an image flame detector is connected to the side end of the combustion chamber, a second chamber is connected to the rear end of the combustion chamber, and an ignition rod, a heating gun and a flame detection and combustion-supporting air pipeline are connected to one end of the second chamber. By the adoption of the anti-ash-blocking ammonium bisulfate vaporizing and heating device, the primary air circulating area and the secondary air circulating area are not reduced, the resistance can be negligible, the system size is compact, and the occupied area is extremely small.

Description

technical field [0001] The invention relates to the technical field of boiler auxiliary equipment in a thermal power plant, in particular to an ammonium bisulfate vaporization heating device for preventing clogging of an air preheater of an SCR denitrification unit. Background technique [0002] SCR (Selective Catalytic Reduction) is a selective catalytic reduction technology, which has developed rapidly in recent years. At present, the ammonia catalytic reduction method is the most widely used technology. It has no by-products, does not form secondary pollution, and has a simple device structure. High removal efficiency (up to 90%), reliable operation, easy maintenance, etc., but for SCR flue gas denitrification, ammonia and nitrogen oxides cannot be completely mixed, and escape is inevitable. When the escape rate exceeds the standard, ammonia gas It reacts with sulfur trioxide to generate ammonium bisulfate to block the air preheater. Due to its special physical propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J3/02F23L15/04F23M11/04
CPCY02E20/34
Inventor 张洪福赛呼
Owner 北京启创天工电力技术应用有限公司