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Ammonia spraying device used for improving uniformity of ammonia gas distribution

A technology with uniform distribution and ammonia gas, applied in the field of denitrification system engineering, can solve the problems of uneven mixing of ammonia and flue gas, and achieve the effect of avoiding excessive nitrogen oxide emissions, improving uniformity, and facilitating mixing

Active Publication Date: 2019-05-31
NANJING GUODIAN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem of uneven mixing of ammonia injection and flue gas in the flue before denitrification, the present invention proposes an ammonia injection device for improving the uniformity of ammonia gas distribution. This structure can effectively improve the mixing uniformity of flue gas and ammonia gas

Method used

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  • Ammonia spraying device used for improving uniformity of ammonia gas distribution
  • Ammonia spraying device used for improving uniformity of ammonia gas distribution
  • Ammonia spraying device used for improving uniformity of ammonia gas distribution

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Embodiment approach

[0039] The present invention is used to improve the ammonia injection device of ammonia distribution uniformity, and the effective mixing embodiment of flue gas and ammonia in the application of this device is as follows:

[0040] Ammonia gas enters several first-stage ammonia injection branch pipes 6 from the ammonia injection main pipe outside the flue. Divided into several partitions. Multiple rows of secondary ammonia injection branch pipes 7 are evenly installed on both sides of each primary ammonia injection branch pipe 6, and the secondary ammonia injection branch pipes 7 evenly divide the flue section into several partitions in the vertical direction, and the interval between the secondary ammonia injection branch pipes is 500mm~700mm. Multiple nozzles 8 are installed on each secondary ammonia injection branch pipe 7, and the spacing density of the nozzles can be adjusted according to the actual flow field distribution of the flue gas.

[0041]The upper end of the no...

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Abstract

The invention discloses an ammonia spraying device used for improving uniformity of ammonia gas distribution. The device is installed on the section of the portion, in front of a denitrification reactor, of a mixing flue to fully mix sprayed ammonia gas with flue gas and meet the requirement of the ammonia and nitrogen molar ratio to the greatest extent. An ammonia gas spraying grate of the deviceis composed of an ammonia gas spraying pipeline and comprises a mother ammonia gas spraying pipe, a first-level ammonia gas spraying branch pipe and a second-level ammonia gas spraying branch pipe; aspraying head is provided with an annular spraying port and a flow guiding piece in a circular cone shape, and the annular spraying port is formed in the direction consistent with the flowing direction of the flue gas. The annular spraying port and the flow guiding piece in the circular cone shape are beneficial for diffusion and guiding of ammonia gas. By arranging the ammonia gas spraying gratedevice, the mixing distance of the ammonia gas and the flue gas can be effectively shortened, and the uniformity of ammonia gas distribution is improved.

Description

technical field [0001] The invention relates to a grid ammonia spraying device and a nozzle thereof in the front flue of a denitrification reactor, belonging to the field of denitrification system engineering. Background technique [0002] In recent years, with the NO X Emission requirements are becoming increasingly stringent. With the implementation of ultra-low emissions, the transformation of flue gas denitrification in thermal power plants is becoming more and more mature. Thermal power unit NO X Emissions are strictly limited to 30mg / m 3 The following is even lower, which puts higher requirements on the efficiency of the denitrification reactor. [0003] Due to the uneven distribution of the flue gas flow field in the flue, if the ammonia injection flow rate is controlled according to the normal ammonia-nitrogen molar ratio, ammonia injection will be insufficient in many areas on the flue cross-section, resulting in an imbalance in the ammonia-nitrogen molar ratio. ...

Claims

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Application Information

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IPC IPC(8): B01D53/76B01D53/56B01F5/00
Inventor 曲震刘宇芳孔红兵谢叶庭杨飞飞杨燕
Owner NANJING GUODIAN ENVIRONMENTAL PROTECTION TECH
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