Layered and partitioned adjusting type ammonia spraying denitration device and denitration method thereof
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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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[0003] The existing common SCR denitrification reaction tower includes: ammonia injection grid, rectification grid, catalyst, etc., wherein the ammonia injection grid is non-ad
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[0031] Example 1:
[0032] See figure 1 In this embodiment, the present embodiment provides a layered partition modulating type spray denitration apparatus, including the reaction column 1, and the reaction column 1 is provided with a flue gas inlet 11 and a flue gas outlet 12. The first injection of the ammonia gate 2, the second injection grid 3, the rectifier grid 4, the catalyst layer 5, and the flue gas detection system 6 are sequentially provided along the flue gas flow direction indicated by the arrow.
[0033] Please combine figure 2 The first injection is divided into 16 partitions in a partition tunable spray, which is divided into 16 partitions perpendicular to the flue gas flow. Each partition is provided with a separate spray ammonia first sub-grill. 21; the number of partitions is not limited, and the size adjustment is adjusted according to the size of the reaction column 1. Please refer to image 3 The first sub grille 21 includes a first intake pipe 211, a ammonia ...
Example Embodiment
[0038] Example 2:
[0039] In conjunction with the first embodiment, the present embodiment also provides a method of denitration method of a hierarchically adjusted spray injection device, including the following steps:
[0040] S1, through the flue gas entry into the flue gas, and the first spray ammonia, the second injection start operation, and spray ammonia in the reaction tower;
[0041] S2, flue gas sequentially passes through the first injection, second injection, rectifier grille, catalyst layer to flue gas detection system;
[0042] S3, the subsystem of the flue gas detection system extracts the reaction tower in the reaction tower, detects its NOx concentration;
[0043] When the NOx concentration in the flue gas flow and the flue gas changes, only the second yard is adjusted, and only the first injection of the first injection is adjusted when the NOx concentration of each partition is not uniform. . details as follows:
[0044] In order to make the treated flue gas cons...
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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....
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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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