化工环保技术论文.doc

武汉工程大学
WUHAN INSTITUTE OF TECHNOLOGY
化工与制药学院
SCHOOL OF CHEMICAL ENGINEERING AND PHARMACY
化工环保技术
Environmental Pdeadly threat to human health.
2 .The main process of flue gas desulfurization
At present, the domestic coal-fired boiler flue gas desulfurization process is numerous, in accordance with the different parts of the application of desulfurization technology in production can be divided into: before the flue gas desulfurization of flue gas desulfurization in combustion, combustion, combustion flue gas desulfurization; according to the method of desulfurization process is divided into: wet, semi dry, dry. The domestic coal-fired boiler flue gas desulfurization process: wet limestone gypsum wet, sodium base, spray drying method, circulating fluidized bed method, Magnesium Oxide wet ammonia desulfurization technology, etc.
3. Wet limestone gypsum method in flue gas desulfurization
In the limestone gypsum wet flue gas desulfurization, sulfur dioxide (SO2) capture the basic process: the flue gas enters the absorption tower, contact, and absorbent physical, chemical reaction, curing sulfur dioxide by-product gypsum finally.
The chemical principle :
The SO2 in flue gas dissolved in water to generate sulfite and dissociate into hydrogen ions and HSO ion; II in flue gas oxygen (fed by air oxidation fan) dissolved in water, the HSO was oxidized to SO; calcium ca