Integrated system for industrial flue gas desulfurization and dewhitening and method thereof

Abstract

The invention discloses an integrated system for industrial flue gas desulfurization and dewhitening and a method thereof. The integrated system comprises a desulfurization tower, a de-whitening unitand a flue gas heat exchanger; the desulfurization tower is provided with a first flue gas inlet and a first flue gas outlet, and the de-whitening unit is provided with a second flue gas inlet and a second flue gas outlet; the flue gas heat exchanger is configured for dividing-wall transmission of the heat of the industrial flue gas in an industrial flue gas conveying pipeline to the second flue gas outlet to discharged the dried gas, and then the industrial flue gas is send to the first flue gas inlet; the first flue gas outlet is in communication with the second flue gas inlet; the de-whitening unit is provided with a first circulation loop and a second circulation loop; a regeneration device is arranged at the first circulation loop; and a self-circulating heat exchanger is arranged onthe second circulation loop; wherein the type of self-circulating heat exchanger is a dividing wall heat exchanger and is used for cooling the absorbing liquid flowing therethrough. The integrated system and the method thereof have low heat energy consumption, and can reduce the dew point of the gas at the outlet.

Description

technical field [0001] The invention relates to an integrated system and method for desulfurization and whitening of industrial flue gas. Background technique [0002] At present, industrial flue gas mainly has two forms: direct discharge and discharge after wet desulfurization. The directly discharged industrial flue gas has high temperature and low humidity, which can keep the chimney dry, so as not to cause obvious corrosion to the chimney. However, the content of nitrogen and sulfur oxides in this flue gas is high, which causes great environmental pollution. [0003] However, although the wet desulfurization of industrial flue gas can remove sulfide, it will also introduce a large amount of water vapor into the flue gas. Since the pollutants in the industrial flue gas cannot be completely removed, low-temperature moist white smoke containing pollutants is formed. This low-temperature wet white smoke is easy to condense on the inner wall of the chimney, forming a strong...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the industrial flue gas undergoes wet desulfurization and then undergoes traditional whitening and dehumidification, which consumes a lot of energy and cannot reduce the dew point of the flue gas at the outlet, and provides a new type for Integrated system and method for desulfurization and whitening of industrial flue gas

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