Deep Condensation Dust and Fog Waste Heat Recovery System

Abstract

The invention provides a deep-condensation dust fog removal and waste heat recovery system. The system comprises a boiler, a desulfurization tower and a condensing heat exchanger, the boiler is communicated with the desulfurization tower, the desulfurization tower is communicated with the deep-condensing heat exchanger through a flue, a smoke and vapor inlet door is arranged on the flue, the condensing heat exchanger is communicated with the desulfurization tower through a mixed liquid drain pipe, and a water sealer for smoke and vapor is arranged on the mixed liquid drain pipe. The system hasthe advantages that white smoke can be removed by 90% or above by means of a deep condensation technology; micro gels are greatly reduced, which are converted in to the amount of smoke and dust <= 5mg / Nm<3>. By means of the system, wet-electric precipitators can be replaced, so that investment is reduced, and a large amount of electric energy is saved; water heat can be recovered, so that the energy saving effect is significant; condensate water in smoke and vapor can be recovered, so that the supplementary water amount is reduced; both the condensing heat exchanger and a primary air heaterare arranged in a bypassing mode, which affect the original production process little, so that the system is safe and reliable and has high flexibility; pipe systems of circulating water and condensate water need lower laying investment, small in occupied area and simple in construction.

Description

technical field [0001] The invention belongs to the field of industrial technology, and in particular relates to a waste heat recovery system for deep condensation and dust removal. Background technique [0002] The flue gas of coal-fired power plants is discharged into the atmosphere through the chimney, forming white water vapor and smoke plume. Most of the flue gas desulfurization in my country adopts wet desulfurization process, especially the limestone-gypsum process. This process can reduce the temperature of the flue gas to about 50°C. The low-temperature saturated wet flue gas enters the atmosphere directly through the chimney, and condenses into tiny droplets when it condenses, producing a "white plume", commonly known as "big white smoke" and "white plume". dragon". [0003] Although the pure white smoke plume has no direct impact on the environmental quality, it will cause troubles to the lives of the surrounding residents. The Environmental Protection Agency o...

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Problems solved by technology

[0005] In the existing technology, the coal-fired unit using the wet desulfurization process tends to form a "white plume" at the chimney outlet. Although the direct heating method can eliminate the "white plume", it will increase the operating energy consumption of the unit

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