Method used for eliminating white mist water vapour at flue gas discharge outlets

Abstract

The invention discloses a method used for eliminating white mist water vapour at flue gas discharge outlets, and belongs to the technical field of low temperature wet flue gas treatment. According tothe method, condensation is carried out firstly, and then heating is carried out; wet method desulphurization flue gas is introduced into a condensing tower, a condensate liquid is adopted for spraying of the flue gas for condensation, so that the temperature of the flue gas is reduced, precipitation of condensed water is realized, and water in the flue gas is removed; the flue gas after removingof condensed water is introduced into a demister to remove mist granules and slurry droplets in flue gas; the flue gas is introduced into a heating device for heating and temperature increasing, so that the moisture saturation degree of the flue gas is reduced, the hypersaturated states of the flue gas are converted into unsaturated states, and flue gas is discharged. The method is capable of preventing generation of white mist effectively; investment cost and operation cost are low; economical benefit and environment benefit are excellent; white mist elimination effect is excellent; and the efficiency is relatively high.

Description

technical field [0001] The invention belongs to the technical field of low-temperature wet flue gas treatment, and in particular relates to a method for eliminating white mist and water vapor at a flue gas discharge port. Background technique [0002] At present, among the flue gas desulfurization systems used in China, the effect of wet desulfurization is the best. However, the water vapor containing dissolved salts and non-dissolved substances emitted by wet desulfurization, the temperature of the flue gas decreases rapidly, and it condenses rapidly when it is cold, forming clusters of "white mist" around the chimney outlet. [0003] For the "white mist" phenomenon at the flue gas outlet of the wet desulfurization system, many scholars have conducted research and proposed various prevention and control measures, but the current solutions still have some shortcomings. For example: installing a flue gas reheating system at the mouth of the chimney, the flue gas reheating sy...

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Problems solved by technology

For example: installing a flue gas reheating system at the mouth of the chimney, the flue gas reheating system consumes energy, and the device is corroded by the flue gas; some scholars have proposed to mix the exhausted flue gas with the untreated flue gas. The sulfur content in the flue gas is greatly increased, which affects the desulfurization rate

In view of the fact that the current control measures are not very perfect, it is necessary to further improve its control methods to eliminate the "white fog" water vapor phenomenon

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