Composite limestone/calcium hydroxide gypsum wet desulfurization device and technique

Abstract

The invention discloses a composite limestone / calcium hydroxide gypsum wet desulfurization device and technique. The device comprises a fume cleaning part, an absorbent supply part, a slurry oxidization part and a gypsum dehydration part, wherein the desulfurization absorbent adopts a limestone / calcium hydroxide slurry, and the calcium hydroxide slurry is added from the opening of a circulating pump pipeline of an absorption tower. The technique disclosed by the invention can be obtained by performing technical modification on a traditional limestone gypsum wet technique, can fully utilize the existing equipment under the condition that the sulfur dioxide concentration is less than 200mg / m<3> more than the standard, and can use the allowance of the existing equipment without adding capacity; when the load of the set or the sulfur content of the coal is high, the composite fume desulfurization technique can be started, so the operation is flexible; and the device and technique have the advantages of low investment cost, basically constant system operation resistance, manufacturing cost saving, short modification period, low operating cost, no influence on the absorption tower oxidization system and gypsum dehydration system, and constant desulfurization byproduct composition.

Description

technical field [0001] The invention relates to a desulfurization device and process, in particular to a composite limestone and calcium hydroxide gypsum wet desulfurization device and process. Background technique [0002] The limestone-gypsum wet process is mostly adopted for flue gas desulfurization in thermal power plants, and the devices used in this process account for more than 90% of the installed capacity of thermal power plants. With the implementation of the new "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011), the original limestone-gypsum flue gas desulfurization devices in thermal power plants cannot meet the requirements of the new emission standards and are facing technical transformation. The current transformation technology generally adopts the following schemes: 1) increase the capacity and height of the original absorption tower, and increase the spray layer; 2) build a new absorption tower, and run in series with the or...

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Problems solved by technology

The investment cost of the above technical transformation is high, and the construction period is long. Due to the increase of the spray layer and the series operation of the absorption tower, the operation resistance of the absorption tower increases, and it is often necessary to increase the capacity of the induced draft fan or the booster fan at the same time, and the investment and operation costs are significant. Increase

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