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Application of a gas-gas heat exchanger in an SCR denitration mixing and flow-uniforming system

A gas-gas heat exchanger and mixed flow technology, which is applied in the field of SCR denitrification, can solve the problems of lower denitrification reaction efficiency, escape, ammonia leakage, etc., and achieve the effect of strengthening the turbulence effect, good dispersion and full mixing

Inactive Publication Date: 2018-04-10
中化环境大气治理股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Insufficient mixing of ammonia and air will affect the mixing of ammonia-air mixed gas and flue gas, resulting in insufficient ammonia reaction, which will reduce the efficiency of denitrification reaction, and may cause leakage or escape of ammonia gas

Method used

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  • Application of a gas-gas heat exchanger in an SCR denitration mixing and flow-uniforming system
  • Application of a gas-gas heat exchanger in an SCR denitration mixing and flow-uniforming system
  • Application of a gas-gas heat exchanger in an SCR denitration mixing and flow-uniforming system

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Such as Figure 1-Figure 6As shown, the present invention relates to a gas-gas heat exchanger, comprising a heat exchange tube 3, a tube sheet, an inlet heat exchange box 4 and an outlet heat exchange box 6, and the two ends of the heat exchange tube 3 are respectively inserted into the corresponding tube sheets A heat exchange tube row is formed, and the heat exchange tube 3 is a cold air channel from the dilution fan 11, and the gaps between a plurality of heat exchange tubes 3 in the heat exchange tube row form a hot flue gas channel. The air inlet of the heat exchange pipe row is connected with the inlet heat exchange box 4, and the inlet heat exchange box 4 is provided with a flange 5 for connecting the air inlet pipe, and the cold air flows through the inlet heat exchange box 4 and the ground. A plurality of heat exchange tubes 3 in each heat exchange tub...

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Abstract

The invention relates to an application of a gas-gas heat exchanger in an SCR denitration mixing and flow-uniforming system. According to the technical scheme, high-temperature flue gas is sent into ahot flue gas channel of the gas-gas heat exchanger to serve as a heat source, the cold air in a cold air channel of the gas-gas heat exchanger is heated in a heat exchange mode, and the heated cold air is conveyed to an ammonia-air mixer to be used for diluting ammonia gas; the gas-gas heat exchanger comprises a heat exchange tube bank, and flow disturbing fins are arranged on a heat exchange pipe of the gas-gas heat exchanger; and the ammonia-air mixer comprises a tubular shell and a mixing blade set positioned in the tubular shell, the mixing blade set comprises a plurality of mixing bladesarranged in parallel at the same cross-section position of the tubular shell, and an inclination angle is formed between each mixing blade and the axis of the tubular shell. According to the application of the gas-gas heat exchanger, the energy, needing to be additionally supplemented, of the whole denitration system can be minimized, the function of a static mixer is also taken into consideration, and the functions of disturbing and uniforming the flow of the flue gas are achieved.

Description

technical field [0001] The invention relates to the application of an air-gas heat exchanger in an SCR denitrification mixed-flow system, and also relates to an air-gas heat exchanger, which belongs to the technical field of SCR denitrification. Background technique [0002] SCR technology is currently the most widely used denitrification technology in industry. This technology is mainly used in the NOx emission control of large boilers such as thermal power boilers. The NOx removal rate is over 90%, and it is currently the most ideal stationary source NOx control. technology. Both urea and liquid ammonia are commonly used reducing agents in SCR technology. The two reducing agents have their own advantages and disadvantages in application: liquid ammonia has the risk of explosion, and relevant national safety regulations must be strictly followed in design and use; urea is non-toxic and non-toxic. Compared with liquid ammonia, the safety performance is higher. However, sinc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/00F23J15/02F23J15/06B01D53/86B01D53/56
CPCB01D53/8631B01D2251/2062B01D2258/0283F23J15/003F23J15/02F23J15/06F23J2215/10Y02E20/30
Inventor 陈希于宏然谭宝霞
Owner 中化环境大气治理股份有限公司
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