Waste heat of circulating water emitted to the environment causes huge thermal pollution and losses lots of thermal energy.Thus

absorption heat pump is applied to recycle the heat.Taking a certain200 MW extraction condensing unit and its heating system as the example

the Aspen Plus software was employed to establish the single/double effect lithium bromide absorption heat pump model.Moreover

comparative analysis for the system under variable conditions was performed.The results indicate that

with an increase in the heat pump outlet heating network water temperature or the heat pump driven steam source

the coefficient of performance(COP)of both the single and double effect cycle heat pump declined.For the same heating temperature

the double-effect cycle can save steam by about 30% more than the single-effect cycle.When the temperature of heat pump outlet heating network water exceeded 90℃

the heating network return water can be heated to about 90℃ by heat pump first

and then to the required temperature by spike heater

thus to ensure the stable operation of system.