Air mixing and white smoke plume removing system capable of cooling slurry and used for flue gas

Abstract

The invention discloses an air mixing and white smoke plume removing system capable of cooling slurry and used for flue gas and relates to a white smoke plume removing process system for flue gas desulfurized by a wet process. The system comprises a desulfurizing tower, slurry spraying pipelines, slurry coolers, an air pipeline and a chimney, wherein slurry heat exchangers arranged on the slurry spraying pipeline are used for cooling the slurry, the cooled slurry is subjected to a contact reaction with flue gas after being distributed by the spraying pipelines, the desulfurizing, cooling and dehumidifying processes are realized, desulfurized flue gas enters the chimney after being mixed with hot air, and is exhausted to the atmosphere via the chimney, and the flue gas contains no white smoke plume during exhausting. The process route is simple, equipment investment is low, modification is convenient and implementation is convenient.

Description

technical field [0001] The invention relates to the application field of flue gas desulfurization, in particular to a slurry-cooled flue gas mixing air whitening system. Background technique [0002] Existing flue gas and tail gas in industries such as electric power, iron and steel, and biochemical industry generally go through desulfurization, destocking and other processing equipment. Especially after the power industry has undergone ultra-low emission transformation, the control indicators are determined to be 4 indicators of smoke, sulfur dioxide, nitrogen oxides, mercury and their compounds, and the emission limits are 10mg / m 3 、35mg / m 3 , 50mg / m 3 , 0.03mg / m 3 , some areas require the smoke emission limit to be 5mg / m 3 . From an environmental point of view, the elimination of pollutants has been greatly improved. [0003] Most of the existing flue gas and tail gas pass through wet desulfurization or spray towers, and limestone-gypsum wet technology is generally ...

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Problems solved by technology

[0006] (1) The water vapor in the flue gas is saturated, the moisture content is large, and the heat load of the flue gas is huge;

[0007] (2) Most of the existing flue gas heating heat exchangers are finned tube heat exchangers, which have low heat transfer efficiency and large footprint, which cannot meet the requirements of existing site renovation;

[0008] (3) The flue gas after desulfurization contains a certain amount of gypsum particles, which is easy to block the heat exchanger;

[0009] In addition, if only adding a flue gas condenser or a flue gas heater between the desulfurization tower and the chimney to dehumidify and raise the temperature, the flue gas heat exchanger will easily cause corrosion failure due to the corrosive medium in the flue gas

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