Quadruple heat exchange system for energy conservation, emission reduction and white smoke elimination of flue gases

Abstract

The invention discloses a quadruple heat exchange system for energy conservation, emission reduction and white smoke elimination of flue gases. The quadruple heat exchange system comprises a front flue gas cooler (1), a water and flue gas heat exchanger (2), a desulfurization tower (3), a condenser (4), a demister (5), a rear flue gas reheater (6) and a chimney (7) which are connected in sequence;the condenser (4) is connected with a cooling tower (8) through a circulating pipeline; the front flue gas cooler (1) and the rear flue gas reheater (6) are connected through a circulating pipeline.The quadruple heat exchange system has the advantages of improved white smoke elimination effect and improved desulfurization efficiency.

Description

technical field [0001] The invention relates to a flue gas treatment system, in particular to a quadruple heat exchange system for flue gas energy saving, emission reduction, white elimination. Background technique [0002] my country is a big energy-consuming country, and its energy structure is dominated by coal. At present, 90% of coal-fired units in my country adopt the limestone-gypsum wet desulfurization process, which reduces the temperature of the flue gas to about 50°C and is in a saturated or supersaturated state, but the low-temperature wet saturated flue gas will condense at the chimney outlet to form A large amount of white smoke plume (commonly known as "white smoke") not only causes visual pollution, but also creates a photochemical reaction environment; at the same time, the existing desulfurization process consumes a lot of water and has low desulfurization efficiency. Therefore, the existing technology has the problems of unsatisfactory tail gas whitening e...

AI Technical Summary

Problems solved by technology

At present, 90% of coal-fired units in my country adopt the limestone-gypsum wet desulfurization process, which reduces the temperature of the flue gas to about 50°C and is in a saturated or supersaturated state, but the low-temperature wet saturated flue gas will condense at the chimney outlet to form A large amount of white smoke plume (commonly known as "white smoke") will not only cause visual pollution, but also create a photochemical reaction environment; at the same time, the existing desulfurization process consumes a lot of water during use, and the desulfurization efficiency is also low

Therefore, the existing technology has the problems of unsatisfactory tail gas whitening effect and low desulfurization efficiency

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