Energy-saving and water-saving flue gas treatment system

Abstract

The invention discloses an energy-saving and water-saving flue gas treatment system. The energy-saving and water-saving flue gas treatment system has the advantages that a liquid storage unit is arranged in an absorption device of the energy-saving and water-saving flue gas treatment system, an inner cavity is divided into a first glue gas treatment zone and a second flue gas treatment zone by theliquid storage unit, flue gas can flow into the absorption device from the bottom of the absorption device and can be in countercurrent contact with concentrated solution sprayed from the top of theabsorption device, moisture in the flue gas can be absorbed by concentrated solution in the second flue gas treatment zone, the concentrated solution in the second flue gas treatment zone can be diluted, latent heat released in moisture phase change procedures can be separated out, and the glue gas and the concentrated solution can be heated until the temperatures of the flue gas and the concentrated solution reach 55-65 DEG C; heated concentrated solution can be led out via the liquid storage unit and can be fed into a first heat exchanger, heat exchange can be carried out on the heated concentrated solution and heat exchange media (such as heat network water), the heat exchange media can be heated by the temperatures of 3-10 DEG C, the concentrated solution can be cooled until the temperature of the concentrated solution is approximately consistent with the temperature of a solution inlet in the top of the second flue gas treatment zone, then the concentrated solution can be fed intothe first flue gas treatment zone, and moisture in the flue gas can continue to be absorbed; cascade heat exchange is adopted for the first time, accordingly, the heat exchange quality can be effectively enhanced, and sensible heat in the original flue gas and latent heat in water vapor of clean flue gas can be deeply recycled and can be utilized.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an energy-saving and water-saving flue gas treatment system. Background technique [0002] With the development of my country's economy, in order to actively respond to the "Shanghai Coal-fired Power Plant Gypsum Rain and Colored Plume Test Technical Requirements (Trial)", Zhejiang "Coal-fired Power Plant Air Pollutant Emission Standards" (draft for proposals), Tianjin "Notice on Further Strengthening the In-depth Control of Air Pollution in Key Industries such as Thermal Power and Iron and Steel in Our City" and the regulations for eliminating colored plumes in Tangshan, Zhangjiakou, Handan and other places in Hebei. Various technical routes for recovering flue gas waste heat have been developed. The common technical route is to arrange flue gas condensers, spray towers or add slurry coolers on the slurry circulation slurry pipes after the desulfuriza...

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is that the existing technical route for recovering flue gas waste heat cannot make deep use of the sensible heat of the original flue gas and the large amount of latent heat of water vapor in the cleaned flue gas, and at the same time energy and water resources are wasted and the investment cost is high , to eliminate the defect that the colored plume has only investment but no return, and thus proposes an energy-saving and water-saving flue gas treatment system

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