Spraying type system and method for extracting moisture of clean flue gas after wet desulphurization

Abstract

The invention discloses a spraying type system and method for extracting moisture of clean flue gas after wet desulphurization, a cyclone separator comprises a separator outer cylinder and a separator inner cylinder, the lower end of the separator outer cylinder is connected with a water collecting tank, the upper end and the lower end of the separator inner cylinder are communicated, the lower end of the separator inner cylinder extends into the separator outer cylinder, and the lower end of the separator outer cylinder is connected with a water collecting tank; the outer wall of the extending part is sleeved with a plurality of spraying rings in the vertical direction, a plurality of nozzles are formed in the lower end face of each spraying ring, and a water inlet of each spraying ring is connected with a spraying water tank; the upper end of the separator inner cylinder extends out of the separator outer cylinder and is connected with a chimney; the outer wall of the separator inner cylinder and the inner wall of the separator outer cylinder form a cavity for flue gas circulation; a first flue gas inlet used for being connected with a flue gas outlet of the desulfurization tower is formed in the separator outer barrel; the controller is used for controlling the spraying water tank to supply cold water to the spraying ring. According to the invention, water vapor in clean flue gas after wet desulphurization can be efficiently collected, and meanwhile, the acid concentration in condensed water is effectively diluted and reduced.

Description

Technical field [0001] The present invention is the field of thermal electricity and gas treatment technology, which involves a system and method of clean flue gas moisture after a spray -type extraction of wet desulfurization. Background technique [0002] The wet desulfurization system consumes a lot of water, and the water used for wet desulfurization is mainly in the form of water steam as the net flue gas is discharged into the atmosphere through the chimney. For air -cooled units, the water consumption of the wet desulfurization system accounts for more than 50 % of the total water consumption of the unit, while the part of the loss of water vapor accounts for 80 % and above the water consumption of the wet desulfurization system. In view of the coal combustion process, a large amount of water steam can also be generated to enter the flue gas. Therefore, if the water vapor in the clean smoke after desulfurization can be collected and used, it is sufficient to meet the water...

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Problems solved by technology

[0003] The flue gas entering the flue gas circulation cavity of the separator is cooled by arranging cooling water pipes on the inner cylinder of the cyclone separator, which can effectively condense the water vapor in the clean flue gas, but because the clean flue gas is still Contains sulfur. When the water vapor in the flue gas is condensed, the sulfur will also dissolve in the condensed water, resulting in an increase in the corrosiveness of the condensed water. The highly corrosive condensed water adheres to the inner wall of the cyclone separator and enters the sump downward. In the middle, it is easy to cause corrosion damage to the cyclone separator, and the acidity concentration of the water entering the sump is high, resulting in high cost for subsequent electrochemical treatment of condensed water

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