Engineering Technical Study Of The Flue Gas Desulfurization For Coal Fired Boiler Of 2×225MW Generator Unit In XINDIAN Power Plant

With the rapid development of economy in China, the total emission of sulfur dioxide is increasing rapidly in recent years. So, the control and reduce in emission of sulfur dioxide has became a severe issue to the sustainable development of economy and society in China.The 2×225MW coal burning boilers in Hua-Dian Power plant are the new building units. And choosing a proper prcess of flue gas desulfurization and performing the whole engineering technical sdudy for the 2×225MW coal burning boilers in order to controlling the emission of the flue fas from the 2×225MW coal burning boilers measure up to the national standards, which have the important social and environmental benefits for the local air pollution condition.First, the development of the wet-FGD process was described and compared and the reaction and absorption tower, which is the key component of the wet-desulfurization units, was introduced briefly.Second, the design conditions of the 2×225MW coal burning boilers in Hua-Dian Power plant were checked. The design conditions include geographical position, engineering geology, communication and transport, meteorological phenomena and water quality analysis and so on. The conditions in operating of the boiler and the coal quality were analysised also.Third, according to the power plant's requirement, four wet FGD methods choosing lime-stone, magnesium oxide, ammonia and sea water as the desulfurizing agent differently were compared based on the comprehensive studies of technology, byproduct and investment. And on the basis of the analysis results, the magnesium oxide-based wet desulfurization process of the Ducon company was choosed. Finally, according to the FGD process of Ducon, the process flow and off-set facility of the whole FGD unit, which including: flue gas system, the preparation system of the agent slurry, reaction and absorption system, desulfurization byproducts system and waste water treatment were studyed.In a word, the feasibility and engineering technical study of the whole FGD unit were completed. The argument results shown that the reasonable process, unit operation, critical equipments and auxiliary facilities have been selected, the flue gas effluent can fully meet the requirements of"Emission standard of air pollutants for thermal power plants".