Combining with the parameters of a 12 MW steam turbine

the equivalent enthalpy drop method was applied to carry out thermodynamic calculation to gain generating capacity and coal consumption rate.The heat transfer area of main heat exchangers was also designed.Under conditions with inlet gas amount of THA

75%and 112%

the coefficient of performance(KCOP)of the heat pump and its benefits was calculated.Finally

economic evaluation was conducted by the net present value and dynamic investment recovery period method.The results show that

after applying the absorption heat pump

under all the three conditions

the coal consumption rate of the unit decreases by about 17g/(kW·h)

the coal saving per year is1 891.34 t

1 358.45 tand 2 411.14 t

respectively

and the net profit is 1.668 8million yuan

1.208 6million yuan and 2.023 3million yuan.In addition

the heat pump heating system can reduce the emission of greenhouse gas.