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Ammonia spraying device and method for anchoring denitrification catalyst module of coal-fired power plant

A denitration catalyst and technology for coal-fired power plants, applied in the field of flue gas denitrification, can solve the problem of uneven distribution of ammonia gas, and achieve the effects of reducing interference along the process, shortening response time, and enhancing controllability

Pending Publication Date: 2019-05-17
NORTH CHINA ELECTRICAL POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to many influencing factors along the way, the distribution of ammonia gas in the traditional ammonia injection grid layout is not exactly the same as the distribution of ammonia gas above the denitrification catalyst

Method used

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  • Ammonia spraying device and method for anchoring denitrification catalyst module of coal-fired power plant
  • Ammonia spraying device and method for anchoring denitrification catalyst module of coal-fired power plant
  • Ammonia spraying device and method for anchoring denitrification catalyst module of coal-fired power plant

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Experimental program
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Effect test

Embodiment 1

[0027] This embodiment provides an ammonia injection device for an anchor paired with a denitrification catalyst module in a coal-fired power plant. figure 1 shown, from figure 1 It can be seen from the figure that it includes a denitration device, an ammonia injection grid 1 and a denitration catalyst module 2 located inside the denitration device, and the ammonia injection grid 1 is located directly above the denitration catalyst module 2;

[0028] The distance between the nozzle of the ammonia injection grid 1 and the denitration catalyst module 2 is 1-2m.

Embodiment 2

[0030] This embodiment provides an ammonia injection method for an anchor paired with a denitration catalyst module in a coal-fired power plant, wherein the method utilizes the ammonia injection device for the anchor paired with a denitration catalyst module in a coal-fired power plant provided in Example 1, which includes the following specific steps :

[0031] (1) Keep the valve openings of all the ammonia injection distribution pipes of the ammonia injection grid the same, and test the nitrogen oxide concentration at each grid test point at the outlet of the denitrification device by pulling the grid;

[0032] (2) adjust the valve opening of the ammonia injection distribution pipe according to the nitrogen oxide concentration distribution law of each grid test point;

[0033] Specifically include: if the concentration of nitrogen oxides at the test point is relatively high, increase the valve opening of the ammonia injection distribution pipe corresponding to the test point...

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Abstract

The invention provides an ammonia spraying device and method for anchoring a denitrification catalyst module of a coal-fired power plant. The device comprises a denitrification device, and an ammoniaspraying grid and the denitrification catalyst module which are located in the denitrification device, wherein the ammonia spraying grid is located just above the denitrification catalyst module. Themethod comprises the following steps: (1) keeping that the opening degrees of valves of all ammonia spraying distribution pipes of the ammonia spraying grid are the same, and testing the concentrationof nitrogen oxide of each gridded testing point at an outlet of the denitrification device through a grid pulling manner; (2) adjusting the opening degrees of the valves of all the ammonia spraying distribution pipes according to a nitrogen oxide concentration distribution rule of each gridded testing point. According to the device provided by the invention, the ammonia spraying grid is directlydistributed just above the denitrification catalyst module and on-way interference is reduced; the ammonia spraying amount at the position corresponding to the denitrification catalyst module is pertinently adjusted and influences caused by the fact that air flow is not distributed uniformly are reduced; the response time of ammonia spraying adjustment is also shortened and the controllability ofthe denitrification device is enhanced.

Description

technical field [0001] The invention relates to an ammonia spraying device and method for anchoring a denitrification catalyst module of a coal-fired power plant, and belongs to the technical field of flue gas denitrification. Background technique [0002] In order to comply with the national ultra-low emission requirements of coal-fired units and the trend of flexible peak-shaving of coal-fired power plants, power plants have higher and higher performance requirements for thermal power unit denitrification devices. After the coal-fired unit has been in operation for a long time, the nitrogen oxides at the outlet of the denitrification device will be unevenly distributed on the same cross-section, which also leads to the phenomenon of high ammonia slip in the ammonia injection area. During the actual adjustment process of the existing ammonia injection, it was found that the ammonia injection section at the inlet of the denitrification device also had uneven flow velocity an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
Inventor 李庆刘高军靳江波张朝阳郭玥杜磊姜龙张清峰
Owner NORTH CHINA ELECTRICAL POWER RES INST
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