FGD Process Research And Design Of Power Plant 2×300MW Units

Flue gas desulfurization (hereinafter called FGD)process disposal technologies of the thermal power generating units mainly introduced from the developed countries abroad has been widely used in FGD projects of native thermal power plants are. We have continuously learned and absorbed the foreign advanced FGD technology, and mastered it by means of constructing another exemplified FGD projects of thermal power generating units during introduction. Moreover, we have achieved to nationalize FGD equipments, so as to fill up the blanks about atmospheric pollution disposal technologies of China environment protection.In allusion to the practical situation of native thermal power generating units, about 95% of thermal power plants prefer wet FGD technologies to dry FGD technologies. Amount the wet FGD technologies, most of projects are applying to limestone-gypsum FGD technology which is mature and stable, and China is rich in limestone mineral which is cost less as absorbent.Wet FGD disposal technology is divided into three main parts:The first part is about flue gas chemcial reacts with FGD absorbent, which is the emphasis in FGD process. It mainly comprises gas inlet system: raw gas ducts, clean gas ducts, sealing air for the ducts, duct dampers, gas-gas-heater, booster fan, absorber sump for gas/liquid reaction, slurry recirculation system, oxidation air fan system and mist eliminator. The second part is about desulphurizer preparation. It maily includes limestone receiving system, limestone convey system and limestone storage system: limestone grinding system, wet ball mill system, limestone slurry tank and so on. The third part is about disposal of FGD byproducts. It mainly consists of hydrocyclone as gypsum primary dewatering system, vacuum belt filter as gypsum secondary dewatering system, gypsum convey system and storage system and so on.In my thesis, by means of designing the FGD disposal process for 300MW thermal power generating units, I have realized and mastered the wet desulfurization process design technoloy gradually, and obtained enough experience of engineering design.Based on planning the limestone-gypsum FGD technology for 300MW thermal power generating units, I have calculated the mass balance of the flue gas and desulphurizer as per the required desulfurization rate, calculated the relationship between consumed materials and produced mass, setup the main performanceparameters of system devices, completed selection of the system equipment, calculated the relevant assistant system equiped for desulfurization, finished related mass balance design, and fulfilled overall FGD system process design. What's more, I have further discussed about the key sections in desulfurization design process, such as the relation between aborber slurry recirculation flow and sulfur contents in gas, to establish the foundation of ultimately mastering limestone-gypsum FGD disposal optimized technology and nationalize FGD major equipment.