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Ammonia spraying device and flue gas denitration device

A flue gas and nozzle technology, which is applied in the field of flue gas denitration devices and ammonia injection devices, can solve the problems of large resistance of denitrification and ammonia injection devices, and achieve the effects of increasing channels and areas, reducing blocking areas, and reducing wear

Pending Publication Date: 2021-06-18
CHINA HUADIAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the denitrification ammonia injection device in the prior art has relatively large resistance, thereby providing an ammonia injection device and a flue gas denitrification device that can reduce resistance

Method used

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  • Ammonia spraying device and flue gas denitration device
  • Ammonia spraying device and flue gas denitration device

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Embodiment 1

[0030] At present, the power plant is undergoing a new round of ultra-low emission transformation projects, which involves the transformation and replacement of a large number of flue gas denitrification devices. The modified or newly built denitrification reactor will install many ammonia injection devices in the vertical section of the reactor for the injection of ammonia gas. The ammonia gas reacts with the nitrogen oxides in the flue gas in the reactor, and the nitrogen oxides remove. The existing ammonia injection device is made of circular steel pipes, holes are opened on the circular pipes, and nozzles of different angles are cross-welded to realize the injection coverage of ammonia gas. Ammonia injection pipes are arranged side by side and parallel inside the flue. The projected area of ​​the pipes occupies almost half of the cross-sectional area of ​​the entire flue. The effective cross-section that the flue gas can pass through is reduced, which greatly increases the...

Embodiment 2

[0047] This embodiment provides a flue gas denitrification device, comprising the ammonia injection device and the flue provided in the above embodiments, and the ammonia injection pipe 1 of the ammonia injection device is horizontally arranged in the flue. Since the short side 2 of the cross-section of the ammonia injection pipeline 1 is perpendicular to the flue gas flow direction in the flue, and the long side 3 is parallel to the flue gas flow direction in the flue duct, the rectangular cross-sectional area of ​​the ammonia injection pipeline 1 is the same as that in the prior art Under the premise that the circular cross-sectional area is equal, that is, under the condition that the ammonia injection flow rate is constant, since the short side 2 is perpendicular to the flue gas flow direction, under the premise that the length of the ammonia injection pipeline 1 is constant, the ammonia injection pipeline 1 The projected area can be greatly reduced, and the blocking area o...

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Abstract

The invention relates to the technical field of environmental protection, in particular to an ammonia spraying device and a flue gas denitration device. The ammonia spraying device comprises an ammonia spraying pipeline suitable for being horizontally arranged in a flue, the cross section of the ammonia spraying pipeline being rectangular, the side, perpendicular to the flowing direction of flue gas in the flue, of the cross section of the ammonia spraying pipeline being a short side, the side parallel to the flowing direction of flue gas in the flue being a long side, and the surface, facing the flowing direction of the flue gas, of the ammonia spraying pipeline being a windward side; a flow guide part arranged on the windward side of the ammonia spraying pipeline; and a nozzle arranged on the ammonia spraying pipeline. On the premise that the length of the ammonia spraying pipeline is not changed, the projection area of the ammonia spraying pipeline can be greatly reduced, the blocking area for flue gas is reduced, the deamination efficiency of the system is ensured, the resistance of the system is effectively reduced, the mass transfer path and area are increased, and the deamination efficiency is improved. The flow guide part is arranged on the windward side of the ammonia spraying pipeline, so that the flowing of flue gas can be guided, the flue gas is prevented from directly colliding with the windward side of the ammonia spraying pipeline, and the abrasion of the windward side can be reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to an ammonia injection device and a flue gas denitrification device. Background technique [0002] At present, the power plant is undergoing a new round of ultra-low emission transformation projects, which involves the transformation and replacement of a large number of flue gas denitrification devices. The modified or newly built denitrification reactor will install many ammonia injection devices in the vertical section of the reactor for the injection of ammonia gas. The ammonia gas reacts with the nitrogen oxides in the flue gas in the reactor, and the nitrogen oxides remove. The existing ammonia injection device is made of circular steel pipes, holes are opened on the circular pipes, and nozzles of different angles are cross-welded to realize the injection coverage of ammonia gas. [0003] Ammonia injection pipes are arranged side by side and parallel inside ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/79B01D53/56
CPCB01D53/56B01D53/79B01D2251/2062B01D2258/0283
Inventor 夏怀鹏白永锋吴冲王凯亮汪洋李伟
Owner CHINA HUADIAN ENG
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