A kind of alkali solution cleaning in the spray desulfurization tower efficiently removes SO 3 craft

Abstract

The invention relates to a process for cleaning alkali liquor in a spray scrubber tower to effectively remove sulfur trioxide (SO3). An alkali liquor cleaning device is arranged in a spray scrubber tower, and comprises an upper cleaning hole plate and a lower layer cleaning hole plate, the upper and the lower layer cleaning hole plates are obliquely arranged, one end of the upper and the lower layer cleaning hole plates is connected through a steering device, shunting devices are respectively arranged on the other ends of the upper and the lower layer cleaning hole plates, the shutting device on the lower layer is communicated with an alkali liquor tank, the alkali liquor tank is communicated on to the shunting device on the upper layer through a pump to form an alkali liquor circulation loop, the inner portions of the cleaning hole plates are hollow, through holes are arranged on the upper and the lower sides of the cleaning hole plates, exhaust gas removing sulfur dioxide (SO2) goes through the through holes of the cleaning hole plates, and passes through two layers of flowing alkali liquors layers, and the SO3 in the exhaust gas is fully contacted with alkali liquor and reacts with the alkali liquor, thereby removing the SO3. The process for cleaning the alkali liquor in the spray scrubber tower to effectively remove the SO3 aims to achieve low cost and input and high efficiency, simply remoulds a desulfurizing tower in a wet flue gas desulphurization technology, keeps high removal efficiency of the SO2, and improves removal efficiency of the SO3 at the same time.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization, and in particular relates to a method for efficiently removing SO by washing with alkaline solution in a spray desulfurization tower. 3 craft. Background technique [0002] In the process of coal combustion in thermal power plants, the sulfur in coal is mainly in the form of a large amount of SO 2 and a small amount of SO 3 Precipitated in the form of power plant flue gas SO 3 The content of SO2 accounts for about 1% to 5% of the total sulfur content. For power plants equipped with SCR denitrification systems, there are about 1% SO 2 Converted to SO under the action of SCR catalyst 3 , while SO 3 It has great harm to boiler equipment. SO in flue gas 3 It will lead to low-temperature corrosion of reheaters and superheaters, high-temperature scaling, and equipment blockage; SO 3 Combined with water vapor in the flue gas to form sulfuric acid vapor, which condenses and corro...

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Problems solved by technology

Low-temperature electrostatic precipitator technology solves the problem of low dust removal efficiency of conventional electrostatic precipitators for high specific resistance dust, not only can achieve low emissions, but also save energy consumption, and can remove most of the SO in the flue gas 3 , SO 3 The removal rate can reach more than 95%, but this technology has certain limitations, and it cannot be applied to high-sulfur coal power plants at present, and low-temperature electrostatic precipitator technology is used to remove SO 3 It is necessary to carry out in-depth transformation of the tail flue and the existing electrostatic precipitator equipment, and the investment is huge. In addition, due to the reduction of the specific resistance of the dust, the electrostatic adhesion of the dust collected on the anode plate will be weakened, resulting in an increase in secondary dust.

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