One of the most important research fields in combined heat and power(CHP)is to recycle the condenser waste heat by absorption heat pump

which can enhance the heating capacity and energy utilization efficiency of the plants.In this system

parameters selection for the extraction steam and condensed steam will affect the system performance and the safe and economic operation of the cogeneration units.Thus

on the basis of deeply analyzing the design and operation mechanism of large cogeneration units

the selection principle and correlation of extraction steam parameters and condensing steam parameters were determined

from the aspect of safe operation

to better utilization of condenser waste heat.At last

the effect of waste heat utilization on power generation was investigated.The results show that

under conditions with small volumetric flow

the air cooling unit has stronger adaptability than the wet cooling unit.Both the heating and power generation should be considered to evaluate the energy utilization efficiency of the cogeneration units with waste heat recovery.