scr denitrification device

Abstract

The invention provides an SCR denitration device and a flue gas denitration method. The SCR denitrification device is used to denitrify the flue gas of the boiler, the boiler has a flue for discharging flue gas, and the SCR denitrification device includes a catalyst injector for spraying powder catalyst into the flue . In the present invention, the powder catalyst is sprayed into the flue to ensure that the catalyst has the maximum reaction ability, and a small amount of catalyst can be sprayed to achieve a good denitrification effect; further, the deceleration layer is used together to prolong the residence time of the powder catalyst and increase the catalytic efficiency. The invention can flexibly adjust the injection amount of the powder catalyst according to the concentration of nitrogen oxides in the flue gas, and can be used for the treatment of violently fluctuating nitrogen oxide flue gas.

Description

technical field [0001] The invention relates to the technical field of flue gas denitration, in particular to a new SCR denitration device and a flue gas denitration method. Background technique [0002] Currently, new-build power plants typically use a selective catalytic reduction (SCR) process for denitrification. SCR denitration system generally consists of SCR reactor, catalyst module, ammonia storage and supply system, ammonia injection system, economizer bypass, SCR bypass and related test control systems. 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 Reacts with nitrogen oxides in flue gas with the participation of catalysts to generate N 2 , to achieve denitrification. The SCR process has better denitration effect, but the investment is...

AI Technical Summary

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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