System and technology capable of utilizing waste heat of desulfurated slurry to prevent chimney from emitting white smoke

Abstract

The invention discloses a system and a technology capable of utilizing waste heat of desulfurated slurry to prevent a chimney from emitting white smoke. The system comprises a desulfurizing tower, anair heater, a high temperature air preheater and a low temperature air preheater, wherein the desulfurizing tower is connected with the air heater; desulfurated slurry from the desulfurizing tower exchanges heat with the cold air of the air heater, and the desulfurated slurry after temperature reduction returns to the desulfurizing tower; the air heater is further connected with the low temperature air preheater; the cold air passing through the air heater is heated by the desulfurated slurry and then enters the low temperature air preheater; the low temperature air preheater is connected withthe inlet of the high temperature air preheater through a pipeline; the outlet of the high temperature air preheater communicates with a boiler and the outlet flue of the desulfurizing tower; most ofhigh temperature air out of the high temperature air preheater is supplied to the boiler via a boiler hot air pipeline and provides oxygen for fuel combustion; and other small part of high temperature air enters the outlet flue of the desulfurizing tower and is mixed with wet flue gas from the desulfurizing tower in the flue to prevent the chimney from emitting white smoke.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a system and a process for eliminating white smoke from chimneys of power plants or industrial kilns by utilizing waste heat of desulfurization slurry. Background technique [0002] At present, wet desulfurization is commonly used in power plants and industrial furnaces. Although wet desulfurization has the advantages of high efficiency and low operating costs, its disadvantages are also obvious. For example, the phenomenon of white smoke ("smoke plume") from chimneys is the One of the disadvantages of the technology, because the moisture contained in the flue gas has reached saturation after passing through the wet desulfurization tower, so when the flue gas is discharged from the chimney into the atmosphere and meets the ambient air with a lower temperature, the temperature As the temperature decreases, the partial pressure of the saturated steam in th...

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Problems solved by technology

The above methods all need to consume additional energy, and several heat exchangers are required to complete the above process. There are problems such as large heat exchange equipment, high energy consumption and high operating costs, and the heat exchange equipment operates in a harsh environment, and there are blockages and corrosion. problems, which bring hidden dangers to the safe operation of this type of equipment

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