Thermodynamic Analysis And Optimum Design Of Smoke-Air-Steam Generalized Regenerative Cycle

With the grade of smoke waste heat in coal-fired power plant getting lower and lower,a medium-low temperature heat energy grade indirect lift system is presented in this paper,which means a smoke-air-steam generalized regenerative cycle.In the cycle,units would use the heat of low temperature smoke(or steam)to exchange the heat of high temperature smoke(or air),or make the heat of medium-low temperature smoke turn into high grade chemical energy.In this paper,we would study further in energy-saving principle in traditional system of waste heat utilization of smoke.Then we would make the optimization scheme of smoke-air-steam generalized regenerative cycle.Different from the traditional schemes which only use low pressure ec onomizer to save energy,we would use prepositive air preheater and air hater to make the smoke,air and steam in thermal power units become a generalized regenerative system.In the system,smoke,air,steam would cross the heating in feed water,condensate water,cold air and coal,it would be a system which could realize replacement of energy level and boiler-turbine coupling.In the paper,we would use EBSILON Professional to simulate the smoke-air-steam generalized regenerative system and traditional recovery system of heat of smoke,whose data is from a 600 MW coal-fired power plant in our country.And using equivalent enthalpy drop method and exergy analysis to the simulation,comparing the economical efficiency and energy-saving effect under the condition of THA,75%THA and 50%THA in the schemes.Then by comparing the economic indicators,we would explore the optimization direction of energy-saving,and provide reference for engineering application of smoke-air-steam generalized regenerative cycle.