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Ammonia spraying device and flue gas denitration device

A flue gas and nozzle technology, which is applied in the fields of ammonia spraying devices and flue gas denitrification devices, can solve the problems of high resistance of denitrification ammonia spraying devices, etc., and achieve the effects of increasing mass transfer channels and areas, small wear and small deformation

Pending Publication Date: 2021-06-01
CHINA HUADIAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

[0029] 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

[0043] 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 minor axis 2 of the cross-section of the ammonia injection pipeline 1 is perpendicular to the flow direction of the flue gas in the flue, and the major axis 3 is parallel to the flow direction of the flue gas in the flue, the elliptical cross-sectional area of ​​the ammonia injection pipeline 1 is comparable to that of the prior art Under the premise that the circular cross-sectional area is equal, that is, under the condition that the flow rate of ammonia injection remains unchanged, since the minor axis 2 is perpendicular to the flow direction of flue gas, under the premise that the length of ammonia injection pipeline 1 remains unchanged, ammonia injection pipeline 1 The projected area can be greatly reduced, an...

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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, wherein the cross section of the ammonia spraying pipeline is in an oval shape, the short axis of the oval shape is perpendicular to the flowing direction of flue gas in the flue, the long axis of the oval shape is parallel to the flowing direction of flue gas in the flue; and a nozzle which is arranged on the ammonia spraying pipeline. Due to the fact that the short axis is perpendicular to the flowing direction of the flue gas, on the premise that the length of the ammonia spraying pipeline is not changed, the projection area of the ammonia spraying pipeline is the product of the length of the short axis and the length of the ammonia spraying pipeline, the flue gas blocking area can be greatly reduced, the deamination efficiency of the system is guaranteed, and the system resistance is effectively reduced. The mass transfer path and area are increased, and the deamination efficiency is improved. In addition, due to the oval shape, flowing of the smoke can be guided, the smoke flows smoothly, and abrasion to the ammonia spraying pipeline is small.

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
CPCB01D53/79B01D53/56B01D2258/0283B01D2251/2062
Inventor 夏怀鹏白永锋吴冲王凯亮汪洋李伟
Owner CHINA HUADIAN ENG
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