Device and process for effectively removing sulfur trioxide in smoke through natural alkali

Abstract

The invention relates to a device and a process for effectively removing sulfur trioxide in smoke through a natural alkali. The device comprises a smoke inlet and a smoke outlet, wherein a bent transitional flue is arranged between the smoke inlet and the smoke outlet; a nozzle system is arranged on the bent transitional flue; a wear-proof plate is arranged on the smoke incoming direction of the nozzle system; and the nozzle system is connected with a natural alkali slurry preparation system. The smoke from the outlet of a selective catalyst reduction (SCR) reactor is sprayed and washed through the natural alkali slurry to completely absorb sulfur trioxide (SO3), and then enters an air preheater. The device for effectively removing sulfur trioxide in the smoke through the natural alkali disclosed by the invention, through the nozzle system on the flue between the tail part of the SCR reactor and the air preheater and by spraying the natural alkali slurry into the flue, can absorb and remove SO3 with a removal efficiency of 80-90% through the strong alkalinity of the natural alkali; through setting the position, quantity, angle and outlet flow velocity of the nozzle, uniform mixing of the absorbent and the smoke is guaranteed; and through the wear-proof plate, abrasion of the smoke on the nozzle is reduced, and optimization and adjustment are carried, so as to reduce the resistance of the flue to the greatest extent.

Description

technical field [0001] The invention relates to a device and process for removing sulfur trioxide from flue gas, which reduces its corrosion to the air preheater, increases the life of the air preheater, and effectively reduces SO in the air. 3 content, reduce the impact on human life and natural ecology, and belong to the technical field of air pollutant control. Background technique [0002] A large amount of pollutants are produced in the process of coal combustion, especially SO 2 and NOx are the most serious. On the basis of the 03 version of the standard, the new air pollution emission standards for thermal power plants focus on increasing the emission of nitrogen oxides in the air pollutants of thermal power plants, and tightened the emission limits of sulfur dioxide, smoke and other pollutants. During the "Twelfth Five-Year Plan" period A large number of power plants use selective catalytic reduction (SCR) technology for denitrification, which has high denitrificat...

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Problems solved by technology

At present, trona is mainly used to produce soda ash, but the development and utilization conditions are poor, the industrial base is weak, and the utilization rate is low

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