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Boiler flue gas removal
“Dewhitening” of boiler flue gas has become a consensus on pollution control of thermal power companies
In view of the fact that the wet desulfurization process accounts for more than 80% of the existing flue gas desulfurization units that have been put into operation, especially after the ultra-clean emission transformation of boilers in thermal power companies, almost all of them have adopted the wet desulfurization process. Due to the high moisture content of the flue gas after wet desulfurization (13-15%) and the lower temperature (50-550C), when the flue gas after desulfurization enters the ambient air, the water vapor in the flue gas is oversaturated. Later, part of the water vapor was condensed and fogged, which resulted in "white smoke" from the chimney. Developed countries require the chimney exhaust temperature to be higher than 800C, so "white smoke" cannot be seen. At present, China does not have a rigid requirement for the chimney exhaust temperature, so the phenomenon of "white smoke" is very common, causing smoke to linger, affecting vision and Dew point corrosion can easily cause misunderstanding among the surrounding people and cause unnecessary attention. It may also provide a photochemical reaction environment of nitrogen oxides, sulfur dioxide and water molecules, which will affect the quality of the air environment.
At present, the mainstream solutions around the “dewhitening” of boiler flue gas are: direct heating after desulfurization, such as flue gas reheater technology system (self-steam heat exchanger GGH), steam heat exchanger technology (SGH), etc. Features such as low investment, quick results, and high operating costs; first cooling and heating methods, such as the heat medium circulation flue gas reheater technology (MGGH), have the characteristics of large investment, large space occupation, and low operating costs, and are suitable for built environmental protection Transformation of investment; Condensation cooling + MGGH method, which has the characteristics of higher efficiency and lower operating costs, and is more suitable for renovation projects of new environmental protection facilities.
Although the “de-whitening” of flue gas after desulfurization is not yet required by government departments, as a thermoelectric company, it is necessary to take precautions, try first, and set an example for other industries. The meeting required that after brewing, enterprises should select appropriate desulfurization “de-whitening” technology for the flue gas after desulfurization based on the actual conditions of their own companies and in combination with the on-site process layout. Technically and economically, the various schemes should be compared to ensure that the system is simple and operable . At the same time, based on the selection of the above processes, it can better assist in the use of external waste heat sources for heating, which can not affect the operation of the system, and has low operating costs, ensuring environmental protection and energy saving.