SCR denitration device and flue gas denitration method

A denitrification and flue gas technology, applied in the field of flue gas denitrification, can solve the problems of insufficient space for boilers and dust collectors, reduced catalytic effect, and inability to extract denitrification, etc., to achieve denitrification treatment, good denitrification treatment, and increase catalytic efficiency Effect

Active Publication Date: 2014-02-05
北京水木清源环保科技有限公司
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Problems solved by technology

The denitrification effect of the SCR process is better, but the investment is large, and the catalyst module is required to have good anti-pollution ability to resist SO 2 and H 2 The adverse effects of O; at the same time, it is also required to have good thermal shock resistance and mechanical strength properties
In addition, because the SCR reactor needs to be installe

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  • SCR denitration device and flue gas denitration method

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Embodiment Construction

[0037] figure 1 A typical application of the SCR denitrification device of the embodiment of the present invention is shown. like figure 1 As shown, the existing power plant generally includes a boiler 1, a flue 8 for discharging flue gas, an ammonia storage tank 3, an air preheater 9, an electrostatic precipitator 10, an absorption tower 11, a heat exchanger 12 and a chimney 13, etc. . In a conventional SCR system, the SCR reactor is arranged between the boiler 1 and the electrostatic precipitator 10, which is arranged for a high-dust environment. The applicant found that the catalytic efficiency of the catalyst in the existing SCR reactor will drop rapidly, on the one hand because a large amount of smoke carried in the flue gas in this area will block the pores of the catalyst, on the other hand, during the operation of the SCR In the process, the catalyst is also subjected to long-term effects of alkali metals, water vapor, arsenic and other substances, resulting in cata...

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Abstract

The invention provides an SCR denitration device and a flue gas denitration method. The SCR denitration device is used for dinitration of the flue gas of a boiler. The boiler is provided with a flue gas channel for discharging the flue gas. The SCR denitration device comprises a catalyst sprayer for spraying a powder catalyst into the flue gas channel. The powder catalyst is sprayed into the flue gas channel, so that the largest reaction capacity of the catalyst can be guaranteed. A relatively good denitration effect can be achieved by spraying a small amount of the catalyst. Furthermore, a deceleration layer is used cooperatively, so that a retention time of the powder catalyst can be prolonged and catalytic efficiency is increased. The spraying amount of the powder catalyst can be flexibly adjusted according to concentrations of nitrogen oxides in the flue gas; and the SCR denitration device and the flue gas denitration method can be used for treatment of an extremely volatile nitrogen oxide flue gas.

Description

technical field [0001] The invention relates to the technical field of flue gas denitration, in particular to a novel SCR denitrification device and a flue gas denitrification method. Background technique [0002] At present, new power plants usually use the selective catalytic reduction (SCR) process for denitrification. SCR denitrification system generally consists of SCR reactor, catalyst module, ammonia storage and supply system, ammonia injection system, economizer bypass, SCR bypass and related test control system, etc. Among them, the catalyst module is placed in the flue of the SCR reactor in the form of a fixed bed, and in the upstream area of ​​the catalyst fixed bed, NH 3 It is sprayed into the flue to mix with the flue gas. When the flue gas flows through the catalyst fixed bed, NH 3 React with nitrogen oxides in the flue gas to form N with the participation of catalysts 2 , to achieve denitrification. The denitrification effect of the SCR process is better,...

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Application Information

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IPC IPC(8): B01D53/90B01D53/56B01D53/79
Inventor 王盛林寿眉王涛倪云峰
Owner 北京水木清源环保科技有限公司
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