Water-saving device for fuel gas purification

Abstract

The invention provides a water-saving device for fuel gas purification. The water-saving device comprises a dust collector, an induced draft fan and an absorption tower which are arranged in turn according to the flow direction of flue gas; the induced draft fan is connected between the dust collector and the absorption tower and used for guiding the fuel gas, coming from a boiler, in the dust collector into the absorption tower; a spraying layer, a primary demister, a water collecting device and a secondary demister are arranged in turn in the absorption tower from bottom to top according tothe flow direction of the fuel gas; the water collecting device comprises a water collector and a condenser; the water collector is arranged under the condenser and used for collecting liquor condensate; the water collector is connected with a buffer box through an overflow pipe; the spraying layer is connected with a slurry tank at the bottom part of the absorption tower through a slurry pipeline; and a slurry circulating pump is mounted on the slurry pipeline. The water-saving device can meet the environmental protection requirements on fuel gas purification, eliminates multi-component pollutants and collects water in the wet fuel gas in a high quality manner for reuse, thereby achieving the purpose of water saving.

Description

【Technical field】 [0001] The invention relates to the technical field of "whitening" of wet flue gas, in particular to a water-saving device for whitening flue gas. 【Background technique】 [0002] At present, most of the desulfurization in China adopts wet desulfurization. Wet desulfurization uses a large amount of slurry to absorb acidic substances in the flue gas, so as to achieve the purpose of removing pollutants. After the flue gas is washed, it is discharged from the chimney in the form of saturated wet flue gas. Excluded, the flue gas temperature at the outlet of wet desulfurization is generally between 50°C and 60°C. When the hot saturated wet flue gas contacts the ambient air, the flue gas is cooled, and the water vapor in the flue gas is precipitated in the form of mist droplets, forming A large white plume. In order to eliminate the visual pollution of white plumes and further deepen the removal of pollutants, the national and local governments have successively ...

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Problems solved by technology

[0004] Slurry condensation is to reduce the temperature of the slurry sprayed by the absorption tower to achieve the purpose of cooling the flue gas. Although the slurry condensation system is simple and the one-time investment is low, there are problems of wear and leakage of the slurry heat exchanger, which affects the stability of the system. At the same time, the condensed water in the flue gas directly enters the slurry, which cannot be recycled

[0005] Flue gas condensation can adopt two forms of heat exchanger condensation and spray condensation. Most of them use heat exchangers, using fluoroplastic or steel pipe heat exchangers. Fluoroplastic heat exchangers have a large one-time investment and a single layout. The heater has a short service life and is prone to corrosion

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