A flue gas heater with defogging function

Abstract

A smoke heater with a defogging function comprises an outer shell. Four rows of waist circular tubes are arranged at the front end of a straight section of the outer shell. The first row of waist circular tubes and the fourth row of waist circular tubes are arranged vertically and are communicated with a water inlet collecting box and a water outlet collecting box respectively. The second row of waist circular tubes and the third row of waist circular tubes are arranged in a V shape. The four rows of waist circular tubes are connected through waist circular tube connecting bending heads to form a snake-shaped pipe. The waist circular tubes are arranged in a narrow-gap mode. A plurality of rows of finned pipes which are arranged horizontally are arranged at the back end of the straight section of the outer shell. The finned pipes are communicated with collecting boxes arranged at the two ends of the outer shell. The four rows of waist circular tubes and the multiple rows of finned pipes form a heat exchanging pipe bundle which divides the smoke heater into a wet smoke zone and a dry smoke zone. The smoke heater can heat smoke and further lower droplet content in the smoke, defogging and heating are combined, smoke temperature is raised, so that smoke lift force is improved, contaminant dispersing concentration is lowered, lime rain is avoided, smoke humidity is lowered, and corrosion on a flue and a chimney from acid droplets is lowered.

Description

technical field [0001] The invention belongs to the technical field of flue gas heaters in boiler flue gas desulfurization systems, and in particular relates to a flue gas heater with a defogging function. Background technique [0002] At present, boiler flue gas desulfurization has become an inevitable requirement. In wet desulfurization, the temperature of flue gas after desulfurization treatment is lower. When the flue gas with too low temperature is discharged from the chimney, the buoyancy of the flue gas (or buoyancy height) decreases, and the exit velocity of the flue gas also decreases accordingly, that is, the effective height of the chimney decreases, which will lead to the residual SO discharged from the chimney X , NO X It is not allowed by environmental protection; and the flue gas temperature is too low, the moisture in the flue gas will condense, forming lime rain, polluting the surrounding environment, and the condensed liquid contains acidic components, wh...

AI Technical Summary

Problems solved by technology

However, due to the low efficiency of the demister, the flue gas from the desulfurization tower still contains a lot of liquid droplets, so it is necessary to further reduce the liquid droplet content in the flue gas

According to the literature, some desulfurization systems install a horizontal demister after the ordinary flue gas heat exchanger, but this will increase the complexity, space and cost of the system

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