Novel flue gas waste heat recycling method

Abstract

The invention discloses a novel flue gas waste heat recycling method. The novel flue gas waste heat recycling method is characterized in that flue gas temperatures of all sections of the tail portionof a flue of a boiler are different, so that high-temperature flue gas heat exchangers of corresponding energy levels, medium-temperature flue gas heat exchangers of corresponding energy levels, low-temperature flue gas heat exchangers of corresponding energy levels and low-low-temperature flue gas heat exchangers of corresponding energy levels are additionally arranged at different positions in the flue so as to fully and deeply utilize flue gas waste heat and achieve energy conservation and emission reduction; the different grades of the flue gas waste heat at the tail portion of the boileris comprehensively utilized, moreover, according to flue gas waste heat resources and different use requirements provided by users, different flow division and different proportions of different coldsources and all stages of flue gas waste heat are achieved by virtue of all stages of heat exchange equipment, and finally energy level matching and gradient utilization are achieved; according to thenovel flue gas waste heat recycling method, the flue gas exhaust temperature is effectively reduced, the generating capacity is increased, the coal consumption is reduced, the dust removal efficiencyand the desulfurization efficiency are improved, the desulfurization water consumption is reduced, a chimney is protected, and the problem of environmental protection up-to-standard emission of enterprises is solved to a certain extent.

Description

technical field [0001] The invention relates to a novel method for recovering and utilizing waste heat of flue gas, which belongs to the technical field of environmental protection, energy saving and emission reduction, and in particular relates to a flue gas which utilizes waste flue gas waste heat discharged from a power station to perform heat exchange between the internal cold source and the external cold source of the thermal system of the power station. Gas waste heat recovery and utilization system carries out waste heat recovery and utilization technologies of "promoting energy saving", "reducing emissions", "increasing efficiency", "corresponding to grade", "corresponding to temperature", and "cascading utilization". Background technique [0002] At present, the flue gas waste heat utilization system commonly used is only a single level of utilization, and most of them are installed on the flue before the outlet of the air preheater and the inlet of the dust collecto...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defect that the flue gas waste heat utilization system in the prior art is only a single level of utilization, and the flue gas waste heat cannot be fully utilized, the present invention provides a new flue gas waste heat recovery and utilization method

Images