湿法脱硫（Wet desulfurization）.docVIP

湿法脱硫（Wet desulfurization） Wet desulfurization is characterized by that the desulfurization system is located at the end of the flue and after the dust collector. The reaction temperature of the desulfurization process is lower than the dew point, so the flue gas after desulfurization needs to be reheated to discharge. The gas-liquid reaction, the desulfurization reaction speed, high efficiency, high utilization rate of desulfurization additive, such as lime as desulfurizer, when Ca/S=1, the desulfurization rate can reach 90%, suitable for large coal-fired power plant flue gas desulfurization. However, there are wastewater treatment problems in wet flue gas desulfurization, with large initial investment and high operating costs. Wet desulfurization can be roughly divided into the following two kinds: Edit this paragraph 1, limestone / plaster method The difference between the technique and the abandonment method is that the air is blown into the slurry of the absorber, forcing the CaSO3 to oxidize to CaSO4 (gypsum), and the by-product of desulfurization is gypsum. At the same time, air blowing produces more uniform slurry, which is easy to reach 90% desulfurization rate, and easy to control fouling and clogging. Since limestone is cheap and easy to transport and preserve, limestone has become a major desulfurization agent in the gypsum process since 80s. At present, the limestone / gypsum forced oxidation system has become the first choice of flue gas desulfurization process in the selection of flue gas desulfurization equipment in thermal power plants at home and abroad. The main advantages of limestone / gypsum method is used with wide range of coal, high desulfurization efficiency (some device Ca/S=1, the desulfurization efficiency is greater than 90%), high absorbent utilization rate (more than 90%), high operation rate (more than 90%), high reliability (the most mature technology of flue gas desulfurization) desulfurizer - limestone source is abundant and cheap.