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Layered and partitioned adjusting type ammonia spraying denitration device and denitration method thereof

A layered and zoning, adjustable technology, applied in separation methods, chemical instruments and methods, and dispersed particle separation, can solve problems such as unadjustable ammonia concentration and uneven NOx concentration, and achieve adjustability and NOx distribution. uniform effect

Pending Publication Date: 2021-08-03
HANGZHOU BEIGAOFENG ELECTRIC POWER ENG DESIGN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing common SCR denitrification reaction tower includes: ammonia injection grid, rectification grid, catalyst, etc., wherein the ammonia injection grid is non-adjustable, and the concentration of ammonia gas in the entire reactor cross section cannot be adjusted, resulting in the Inhomogeneous NOx concentration across the cross section

Method used

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  • Layered and partitioned adjusting type ammonia spraying denitration device and denitration method thereof
  • Layered and partitioned adjusting type ammonia spraying denitration device and denitration method thereof
  • Layered and partitioned adjusting type ammonia spraying denitration device and denitration method thereof

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Embodiment 1

[0032] see figure 1 , this embodiment provides a layered and partitioned adjustable ammonia injection denitrification device, including a reaction tower 1, and the reaction tower 1 is provided with a flue gas inlet 11 and a flue gas outlet 12. The first ammonia injection grid 2 , the second ammonia injection grid 3 , the rectification grid 4 , the catalyst layer 5 , and the smoke detection system 6 are sequentially arranged in the reaction tower 1 along the flow direction of the flue gas indicated by the arrow.

[0033] Please combine figure 2 , the first ammonia injection grill 2 is a zone-adjustable ammonia injection grid, which is divided into 16 zones along the direction perpendicular to the flow of flue gas, and each zone is provided with a first sub-grid for independent ammonia injection 21; The number of partitions is not limited, it is adjusted according to the size of the reaction tower 1 . Please refer to image 3 , the first sub-grid 21 includes a first inlet pi...

Embodiment 2

[0039] In combination with the denitrification device in Embodiment 1, this embodiment also provides a denitrification method for a layered and partitioned adjustable ammonia injection denitrification device, which includes the following steps:

[0040] S1, the flue gas is introduced from the flue gas inlet, and at the same time the first ammonia injection grid and the second ammonia injection grid start to work, injecting ammonia gas into the reaction tower;

[0041] S2, the flue gas passes through the first ammonia injection grid, the second ammonia injection grid, the rectification grid and the catalyst layer to the flue gas detection system in sequence;

[0042] S3, the subsystems of the flue gas detection system respectively extract the flue gas in the reaction tower to detect the NOx concentration;

[0043] S4, when the flue gas flow rate and the NOx concentration in the flue gas change, only the second ammonia injection grill can be adjusted, and only when the NOx concent...

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Abstract

The invention discloses a layered and partitioned adjusting type ammonia spraying denitration device, and relates to the technical field of flue gas treatment. The device comprises a reaction tower which is provided with a flue gas inlet and a flue gas outlet; a first ammonia spraying grid, a second ammonia spraying grid, a rectification grid, a catalyst layer and a flue gas detection system are sequentially arranged in the reaction tower in the flue gas circulation direction; a plurality of independent ammonia spraying first sub-grids are distributed on the first ammonia spraying grid in the direction perpendicular to the flue gas circulation direction; the flue gas detection system comprises an NOx concentration detection system used for detecting the NOx concentration and subsystems in one-to-one correspondence with the first sub-grids in the flue gas circulation direction, each subsystem comprises a gas extraction pipeline for extracting flue gas in the reaction tower, and the gas extraction pipelines are connected with the NOx concentration detection system; the invention further discloses a denitration method of the layered and partitioned adjusting type ammonia spraying denitration device. The adjustable ammonia concentration of the cross section in the reaction tower is realized so that NOx in purified flue gas on the same cross section in the reaction tower is uniformly distributed.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to a layered and partitioned adjustable ammonia injection denitrification device and a denitrification method thereof. Background technique [0002] SCR (Selective Catalytic Reduction) is a selective catalytic reduction technology, which has developed rapidly in recent years and has been widely used in Western Europe and Japan. At present, ammonia catalytic reduction is the most widely used technology. It has no by-products, no secondary pollution, simple device structure, high removal efficiency (up to over 90%), reliable operation, and easy maintenance. The denitrification principle of SCR technology is: under the action of a catalyst, ammonia is injected into the flue gas at a temperature of about 300-420°C to reduce NOx into N2 and H2O. [0003] The existing common SCR denitrification reaction tower includes: ammonia injection grid, rectification grid, catalyst, etc....

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/56
CPCB01D53/8631B01D53/90B01D2251/2062B01D2258/0283
Inventor 洪方明胡宏兴吴剑恒王大为欧阳连燚林崇军王正国郑冬兵
Owner HANGZHOU BEIGAOFENG ELECTRIC POWER ENG DESIGN
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