Device and method for removing sulfur trioxide in boiler flue gas

Abstract

The invention discloses a device for removing the sulfur trioxide in boiler flue gas. The device comprises an absorbent storage bunker; a conical shell is arranged at the lower part of the absorbent storage bunker; a fluidization fan is connected with an inner cavity of the conical shell by a fluidized air heater; the bottom of the conical shell is connected with a feeding hole of a feeder; an air inlet pipe of the feeder is connected with a conveying fan by a delivery air heater, and an air outlet pipe of the feeder is connected with a spray master pipe; the spray master pipe is connected with two or more spray branch pipes, and each spray branch pipe is connected with one or more nozzles; the nozzles are arranged in a flue in front of a flue gas inlet pipe of a boiler air pre-heater. The invention also discloses a method for removing the sulfur trioxide in the boiler flue gas. The device and the method not only solve the problems of corrosion and blockage of the air pre-heater, and the like, but can also reduce the consumption of an absorbent, improve the removal efficiency and reduce the flue resistance increment.

Description

Technical field [0001] The invention relates to a device and method for removing sulfur trioxide in boiler flue gas, in particular to a device and method for removing sulfur trioxide in coal-fired boiler flue gas. Background technique [0002] The presence of SO3 in the flue gas of coal-fired boilers has a significant impact on system equipment and environmental emissions, mainly including: (1) The acid dew point of the flue gas increases, and the increase of the acid dew point requires an increase in the temperature of the boiler exhaust gas. It will increase the exhaust gas loss of the boiler, reduce the thermal efficiency of the boiler, and cause a waste of energy; (2) The exhaust gas is opaque, and blue plume may appear; (3) Corrosion of the air preheater; when the flue gas flows through the air preheater The flue gas temperature will drop rapidly. If the mass fraction of SO3 in the flue gas is large, it is very easy to cause the H2SO4 vapor to condense on the tube wall, ther...

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Problems solved by technology

[0004] The purpose of the present invention is to aim at the above-mentioned deficiency of prior art, provide a kind of boiler flue gas sulfur trioxide removal device and method, it can not only solve problems such as air preheater corrosion, clogging, and can reduce the consumption of absorbent, Improve the removal efficiency, and the flue resistance increase is small

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