SCR denitration device and flue gas denitration method

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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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 installed between the boiler and the dust collector, and the SCR reactor is large in size, there is not enough space between the boiler and the dust collector in the old power plants in my country, so the SCR process cannot be used for denitrification

Moreover, the existing SCR system still has the defect that the catalytic effect decreases rapidly after working for a period of time

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