Flue gas dust removing and defogging heat recovery system

Abstract

The invention provides a flue gas dust removing and defogging heat recovery system. The system comprises a flue gas defogging heat recovery box, wherein a water storage tank is connected with three heat exchangers through water pipes respectively, a spray circulating pump is further arranged between the water storage tank and each heat exchanger, each heat exchanger is also connected with a spraypipe, a spray head is arranged at the upper end of each spray pipe, and the upper ends of the three spray pipes are located in a first-stage operation region, a second-stage operation region and a third-stage operation region respectively; and a water outlet pipe of each heat exchanger is connected with a high-temperature water tank, a preheating water tank and a coal washing water pipeline, and the high-temperature water tank provides heating water outwards through a hot water variable-frequency supply pump. The system has the advantages that multi-stage water film spray in the system can substantially cool discharged high-temperature flue gas, condensed water and sprayed water are stored at the bottoms of the tanks, and after heat exchange through the heat exchangers, hot water resources, such as bath water, heating water and equipment gas or water for preheating, can be provided for all heat requiring units in a mine.

Description

technical field [0001] The invention relates to the field of flue gas treatment, in particular to a heat recovery system for dust removal and mist elimination of flue gas. Background technique [0002] Due to the increasingly serious environmental protection situation, in order to ensure a good production and living environment for urban residents, high-polluting enterprises in the urban area of ​​Pingdingshan are restricted for a long time every year because of environmental protection standards. [0003] In the current production process, the traditional coal washing plant adopts a rotary kiln coal slime drying system, which generates a large amount of high-temperature dry hot air through boiler heating, and then fully contacts the wet coal slime inside the rotary kiln and takes away the moisture in the coal slime. This method can efficiently dry a large amount of coal slime, but a large amount of fine coal slime dust will be discharged out of the drying kiln along with th...

AI Technical Summary

Problems solved by technology

The emission of coal dust particles has been greatly reduced, but it still cannot solve the problem of massive emission of white mist

[0005] The existing improvement methods have alleviated the problem of pollutant discharge to a certain extent, but there are still a large number of pollutants discharged with high-temperature flue gas, and the heat discharged from the flue gas has not been fully utilized, causing environmental pollution and resource pollution. waste of

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