The Feasibility Study Of Improving Medium-speed Pulyerizer Outlet Temperature

The lack of energy impedes advance of society, so far authority took action to carry out Energy conservation and cost reduction projects. Thermal power plant is the largest coal consumer in China, so it is highly significant to develop cost reduction projects.Exhaust gas loss (q2) is the biggest loss in boiler, so if we can decrease q2, coal can be used less.The paper deeply analysed the feasibility of increasing medium-speed pulverizer outlet temperature, then found the maximum pulverizer inlet hot air temperature when boiler run safely, then decreased q2 and raised thermal efficiency of boiler.Generally, operation regulations set rules about pulverizer outlet temperature to assure system running safely; always it leads to energy waste. Theoretically, a coal corresponds to a safe and maximum pulverizer inlet hot air temperature, so this paper worked at how to get the optimum temperature.TG-FTIR can make sure how CO Separated from coal.Generally medium-speed pulverizer can mill bituminous coal,subbituminous and brown coal,these coals contains a lot of O,therefore the flammable gas from coals always is CO,the paper analysed CO separation from coal under conditions of N2 or air by TG-FTIR,then defined CO first generated temperature.This temperature was defined to be the safe and maximum pulverizer inlet hot air temperature, and analysed the relationship between CO and Vdaf.Field test of Improving medium-speed pulverizer outlet temperature began in 300WM wenzhou Thermal power plant, during test the Coal Preparation System ran safely,and there was no CO generated in pulverizer, and exhaust temperature decreased 7℃,and the thermal efficiency of boiler raised 0.37%.