Energy Saving Optimization For Heating System Of Steam Extraction In Power Plant Based On The Absorption Heat Pump System

The central heating is the main heating mode in our country.The general use of high parameter steam turbine steam heating water heater directly from the 70? heated to 110?.The use of extraction steam to drive lithium bromide absorption type heat pump and peak heater to make the heating water be heated to a given temperature,can improve the efficiency of steam heating unit.Therefore,this paper studies the energy saving optimization of steam extraction heating system based on absorption heat pump and takes N1000-26.25/600/600 steam turbine as the research object.This paper establishes the model of generator,absorber,condenser and evaporator of heat driven lithium bromide absorption type heat pump and analyzes the influence of pump entrance temperature,outlet temperature and heat source temperature on the coefficient of performance and exergy efficiency of heat pump.Under rated condition,the coefficient of performance of heat pump system is 1.66,the exergy efficiency is about 67.73%.According to the design parameters of the research object,three kinds of connection of lithium bromide absorption type heat pump and peak heater are studied.The first plan is the heating water in order to enter heat pump and peak heater series,the second plan is the heating water in order to enter peak heater and heat pump series and the third plan is the heating water enter heat pump and peak pump in parallel.After the calculation of extraction two of total amount of steam unit respectively with the change of the heating water in the heat pump system and the ratio of peak heater,the first plan is chosen as the extraction optimization scheme.Equivalent enthalpy drop method and Flugel formula are used when analysis extraction steam heating unit for variable condition.When the heating water outlet temperature increases from 105? to 130?,the rate of coal consumption for power generation reduces from 258.98 g/(kWh)to 258 g/(kWh)and the rate of heating coal consumption increases from 34.08kg/GJ to 35.82kg/GJ.When the temperature of water heating increases from 55? to 70?,the rate of coal consumption for power generation decreases from 260.32 g/(kWh)down to 258.68 g/(kWh)and the rate of heating standard coal consumption increases from 31.65 kg/GJ to 34.60kg/GJ.The heating water in the heat pump heating after a rise of 1?,the rate of coal consumption for power generation increases 0.198g/(kWh)and the rate of heating coal consumption reduces 0.356kg/GJ.The heating rate increases and the heat consumption rate decreases.The amount of heating increases 1000 kW,the rate of coal consumption for power generationreduces the 0.035g/(kWh).