A scr low temperature denitrification device

Abstract

The invention provides an SCR low-temperature denitrification device, which includes a reactor shell, which has a flue gas inlet and a flue gas outlet; an ammonia spray grid, which is equipped with a spray head; a catalyst storage cylinder and the inner wall of the reactor shell A flue gas overflow channel is left, and the flue gas overflow channel is connected to the flue gas outlet; the catalyst storage cylinder includes a catalyst outer cylinder and a catalyst inner cylinder located in the catalyst outer cylinder, and a turning member is installed in the catalyst inner cylinder, and the turning member has a fork that can reciprocate and rotate When the fork-shaped piece rotates, the catalyst particles in the catalyst inner cylinder are stirred; the reactor inner tube is located in the middle of the catalyst outer cylinder, the catalyst inner cylinder is close to the reactor inner tube, and the top of the reactor inner tube is provided with an air inlet. The bottom of the inner tube of the reactor is a sealed structure, and the flue gas entering the inner tube of the reactor from the air inlet radially passes through the catalyst inner cylinder and the catalyst outer cylinder and then enters the flue gas overflow channel. The invention can solve the problems that the catalyst is easy to agglomerate and deactivate and the catalytic efficiency is low in the denitrification reactor.

Description

technical field

[0001] The invention belongs to the technical field of environmental protection equipment, and in particular relates to an SCR low-temperature denitrification device. Background technique

[0002] The pollutants in the lime kiln flue gas mainly include dust, sulfur dioxide, nitrogen oxides, etc. The flue gas treatment path can first desulfurize it, then enter the high-temperature bag dust removal, and then enter the SCR reactor for denitrification, and finally discharge it into the air through the induced draft fan. in the chimney.

[0003] Since the desulfurized flue gas still contains a small amount of SOX, it reacts with the ammonia in the SCR reactor to form ammonium salts, and the ammonium salts are absorbed in the catalyst of the reactor, which is likely to cause the catalyst to agglomerate or deactivate due to the increase in viscosity. The operating period of the catalyst is shortened. In addition, since the catalyst bed is usually a fixed bed, unde...

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