Device and method for removing SO3 by using SCR denitration device

Abstract

The invention discloses a device and a method for removing SO3 by using an SCR denitration device. The device comprises an alkaline particle storage tank, a feeder, a compressed air storage tank, a first valve, a second valve, a first flow meter, a second flow meter, an ammonia buffer tank, a mixer, an economizer outlet flue, an SCR inlet horizontal flue, a flue gas guiding device, an SCR inlet vertical flue, an SCR denitration catalyst layer, an SCR reactor and an SCR outlet flue; an ammonia spraying grid is arranged in the SCR inlet horizontal flue or the SCR inlet vertical flue; an outlet of the ammonia buffer tank is communicated with an inlet of the mixer; and an outlet of the compressed air storage tank is communicated with an inlet of the mixer after being combined with an outlet of the feeder through a pipeline, an outlet of the alkaline particle storage tank is communicated with an inlet of the feeder, and an outlet of the mixer is communicated with an inlet of the ammonia spraying grid. The device and method can simultaneously achieve denitration and SO3 removal; and meanwhile, the device and method have the characteristics that the structure is simple and the reliability is high.

Description

technical field [0001] The invention relates to a method for removing SO 3 Device and method, specifically relate to a kind of utilizing SCR denitrification device to remove SO 3 devices and methods. Background technique [0002] With the increasingly stringent national environmental protection standards, the NOx emissions of coal-fired units are required to reach ultra-low emissions (50mg / m 3 Below), coal-fired units mostly use selective catalytic reduction (SCR) technology or a hybrid method of selective non-catalytic reduction (SNCR) + selective catalytic reduction (SCR) to achieve ultra-low emissions. SCR denitrification efficiency usually reaches more than 90%, and a large amount of catalysts need to be used under the requirement of such high SCR denitrification efficiency. Active components in SCR catalysts are known to contribute about 1% of SO in flue gas 2 Convert to SO 3 , coupled with the high sulfur content in the coal burned by some power plants, the SO pro...

AI Technical Summary

Problems solved by technology

It can be seen that the removal of SO by spraying into the solution 3 The device and system are complex, and spraying the solution will affect the efficiency of the boiler; and spraying solid particles to remove SO 3 A large number of injection devices need to be arranged to obtain better solid particles and SO in the flue gas 3 uniformity of mixing

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