Smoke-waste-heat recovery device with perpendicular low-resistance cooling system

Abstract

The invention discloses a smoke-waste-heat recovery device with a perpendicular low-resistance cooling system. The smoke-waste-heat recovery device with the perpendicular low-resistance cooling system comprises a dust remover, a desulfurizing tower, an air drawing machine and a chimney, wherein the dust remover, the desulfurizing tower, the air drawing machine and the chimney are sequentially arranged on a boiler smoke discharging pipe. The perpendicular low-resistance cooling system is arranged on a smoke discharging pipe between the dust remover and the desulfurizing tower, and comprises a hollow heat dissipation column, and a refrigerating agent is put inside the heat dissipation column. According to the smoke-waste-heat recovery device, heat recovery, preheating of cold air of a boiler and preheating of softened water required by the boiler are achieved through a heat cycle pipe, the closed loop application of heat energy is really achieved, and the energy utilization rate is increased.

Description

technical field [0001] The invention relates to the field of waste heat recovery, in particular to a flue gas waste heat recovery device with a vertical low-resistance cooling system. Background technique [0002] The flue gas emitted by coal-fired boilers will contain dust, moisture, SOx, NOx and other impurities. In order to prevent low-temperature acid corrosion of equipment and blockage of flue gas channels due to flue gas temperature lower than the acid dew point, after The exhaust gas temperature after heat exchange of one or more stages of economizer and air preheater is controlled above the acid dew point, which is about 135 to 200°C. After that, the flue gas passes through the dust removal system and desulfurization system, and then is discharged into the atmosphere through the induced draft fan and the chimney. Due to the high discharge temperature of the flue gas, the resulting boiler exhaust heat loss is as high as 6 to 10%. In particular, the thermal efficienc...

AI Technical Summary

Problems solved by technology

Due to the high discharge temperature of the flue gas, the resulting boiler exhaust heat loss is as high as 6 to 10%

In particular, the thermal efficiency of small and medium-sized boilers is far lower than that of large boilers, and the phenomenon of fuel waste is even more serious

In addition, the desulfurization system of the boiler often adopts the alkaline desulfurization method, which requires a large amount of expensive alkaline solution, so the cost of desulfurization is also high

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