Desulfuration wastewater zero discharge coupling smoke white removal integration system

Abstract

The invention belongs to the technical field of industrial energy saving and environment protection and relates to a desulfuration wastewater zero discharge coupling smoke white removal integration system in a wet-process desulfuration technology. The system comprises a gas-water heat exchanger, a water-water heat exchanger, an evaporation crystallizer, a steam-gas heat exchanger and a hydrophobic expansion tank; heat in high-temperature non-desulfuration smoke is transferred into hot medium water through the gas-water heat exchanger, heat in the hot medium water is transferred into desulfuration wastewater through the water-water heat exchanger, heat in the desulfuration wastewater is transferred into steam after vaporization through the evaporation crystallizer, heat in the steam is transferred into purified smoke through the steam-gas heat exchanger, and liquid-state water generated after the steam is condensed is stored through the hydrophobic expansion tank and can be reused by other technologies in a factory. According to the system, the aims of clean treatment of the desulfuration wastewater and removal of chimney gypsum rain and white smoke are achieved, the problem of water unbalance during operation of a desulfuration tower is solved, safe and reliable operation of the desulfuration tower under the variable working condition is guaranteed, and the operation cost of enterprises is lowered.

Description

technical field [0001] The invention belongs to the technical field of industrial energy saving and environmental protection, and specifically relates to an integrated system for zero discharge of desulfurization wastewater coupled with flue gas dewhitening, which can be used for the clean treatment of flue gas dewhitening and desulfurization wastewater in wet desulfurization process. Background technique [0002] China's energy structure is characterized by rich coal, poor oil, and little gas, which determines that the energy source required for domestic industrial production is dominated by coal, accounting for about 70% of total energy consumption. Coal-burning smoke is the main source of sulfur dioxide, nitrogen oxides and soot in the atmospheric environment. Coal-burning pollution will still be an important feature of my country's air pollution for a period of time in the future. [0003] In order to improve the living environment of the people, through efforts in recen...

AI Technical Summary

Problems solved by technology

With the implementation of more and more flue gas dewhitening projects, some new problems have emerged in engineering applications. Among them, one of the more prominent problems is the desulfurization tower caused by the improper design or operation of the flue gas dewhitening system. The problem of water balance imbalance has also brought about an increase in the discharge of desulfurization wastewater, increased the difficulty of operation for operators, increased the operating costs of enterprises, and caused varying degrees of pollution to the natural environment

[0004] In addition, in terms of terminal treatment of desulfurization wastewater, the main treatment technologies include evaporation pond, multi-stage flash evaporation, low-temperature multi-effect evaporation crystallization, mechanical vapor recompression technology, flue evaporation method and bypass flue drying method, among which evaporation The pond method occupies a large area, and the water is discharged into the atmosphere and cannot be recovered, resulting in waste of water resources and environmental pollution; multi-stage flash evaporation, low-temperature multi-effect evaporation crystallization, and mechanical vapor recompression technology have high energy consumption, complex systems, and large investment; On the one hand, the evaporation and bypass flue drying methods affect the operation of the original flue gas system, and cannot recover the water in the waste liquid; on the other hand, they increase the moisture content of the flue gas entering the wet desulfurization tower, which affects the operating parameters of desulfurization

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