Semi-dry desulfurization and denitrification system

Abstract

The invention discloses a semi-dry desulfurization and denitrification system which comprises a circulating fluidized bed desulfurization tower, the circulating fluidized bed desulfurization tower comprises a Venturi-shaped pipe section, a flue gas inlet is formed in the lower end of the pipe section of the circulating fluidized bed desulfurization tower, and the upper end of the pipe section of the circulating fluidized bed desulfurization tower is further connected with a water tank and a desulfurizer bin. A flue gas outlet is formed in the upper end of the circulating fluidized bed desulfurization tower, a bypass flue gas inlet pipe is arranged on the upper pipe section of the circulating fluidized bed desulfurization tower, and flue gas in the bypass flue gas inlet pipe enters the circulating fluidized bed desulfurization tower and flows horizontally. According to the invention, by arranging the transversely arranged bypass pipeline, the axial flow flue gas accelerated by the pipeline is subjected to radial flow mixing, the turbulence of the flue gas is enhanced, the effective collision between the flue gas and particles is enhanced, and the reaction surface of the desulfurizer particles is continuously updated, so that the desulfurization performance is improved.

Description

technical field [0001] The invention relates to the technical field of combustion flue gas treatment, in particular to a semi-dry desulfurization and denitrification system. Background technique [0002] Among the waste gas emissions of iron and steel enterprises, the sintering waste gas discharged occupies a huge proportion. At present, there are three kinds of process routes for sintering machine exhaust gas treatment in the iron and steel industry. First, circulating fluidized bed desulfurization (semi-dry desulfurization) + medium and low temperature SCR denitrification process; second, activated coke desulfurization and denitrification integrated technology; 3. Wet desulfurization + SCR combined denitrification process. The circulating fluidized bed desulfurization (semi-dry desulfurization) + medium and low temperature SCR denitrification process has become the most mainstream waste gas treatment in the iron and steel industry due to its advantages such as simple proc...

AI Technical Summary

Problems solved by technology

Among them, the flue gas passing through the Venturi tube alone can only accelerate the flue gas in the axial direction, while the flue gas in the radial direction has no mixing disturbance, and there is a problem of incomplete desulfurization efficiency.

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