SCR denitration device for controlling escape rate of ammonia, and working method thereof

Abstract

The invention discloses an SCR denitration device for controlling the escape rate of ammonia. The device comprises a denitration system, one side of the denitration system is fixedly connected with afirst pipeline, a second pipeline and a third pipeline, one ends of the first pipeline, the second pipeline and the third pipeline extend into the denitration system, and the one ends of the first pipeline, the second pipeline and the third pipeline are sequentially arranged in the denitration system from top to bottom; and outside the denitration system, the other ends of the first pipeline, thesecond pipeline and the third pipeline are fixedly connected with a flue gas analyzer. The SCR denitration device for controlling the escape rate of ammonia extracts flue gas in the denitration systemfrom different pipelines to make the flue gas analyzer realize the purpose of multipoint measurement, and utilizes a controller to control a plurality of solenoid valves in order to accurately adjustthe ammonia spraying amount and treat SO3 in the flue gas, so the problems of large size of the cross section of a flue and inaccurate result of single-point test are solved, and escape caused by excess ammonia spray amount is avoided.

Description

technical field [0001] The invention relates to the technical field of denitrification equipment, in particular to an SCR denitrification device for controlling the escape rate of ammonia and a working method thereof. Background technique [0002] The flue gas pollutants of coal-fired power plants mainly include soot, sulfur dioxide, nitrogen oxides, etc. The emission concentration of flue gas pollutants in coal-fired power plants is controlled by soot, sulfur dioxide, and nitrogen oxides. , SO 3 As a special pollutant existing in coal-fired flue gas, it has the characteristics of high hazard, difficult to control, and difficult to detect. 3 Attention to pollution has also gradually increased. Many air pollution problems, such as smog, blue smoke from power plants, corrosion of power plant flues and related equipment, have been found to be related to SO 3 There is a close relationship, the SCR denitrification device of the coal-fired power plant needs to spray ammonia in t...

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Problems solved by technology

[0002] The flue gas pollutants of coal-fired power plants mainly include soot, sulfur dioxide, nitrogen oxides, etc. The emission concentration of flue gas pollutants in coal-fired power plants is controlled by soot, sulfur dioxide, and nitrogen oxides. , SO 3 As a special pollutant existing in coal-fired flue gas, it has the characteristics of high hazard, difficult to control, and difficult to detect. 3 Attention to pollution has also gradually increased. Many air pollution problems, such as smog, blue smoke from power plants, corrosion of power plant flues and related equipment, have been found to be related to SO 3 There is a close relationship, the SCR denitrification device of the coal-fired power plant needs to spray ammonia in the flue gas to remove SO in the flue gas 3 For example, the Chinese patent application number is 201810146615.3, but the ammonia injection system of the existing SCR denitrification device needs to frequently manually adjust the amount of ammonia injection when injecting ammonia, which increases the labor intensity. SO in the region 3 The contents are also different, so there is often an excessive amount of ammonia sprayed, resulting in ammonia escape, which will react with other substances to produce other intermediate products, which will lead to a series of air preheater blockage, dust removal efficiency reduction, catalyst damage, etc. When the problem is severe, it will affect the operation of the unit and reduce the economy and safety of the system. Therefore, the present invention proposes a SCR denitrification device that controls the ammonia escape rate

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