In summer

the direct air cooling units will suffer high back pressure and its output power will be insufficient.Against this problem

the evaporative condensing technique was proposed to diverge part of the turbine exhaust steam and reduce the heat load of air cooling island

thus the unit operating back pressure can be decreased.Taking a direct air cooling 600 MW unit as the example

the application performance of evaporative condensing technique was carried out

and the change laws of application effect with such parameters as the distributing ratio of turbine exhaust

the unit load and the ambient air temperature was obtained.The results show that

the decrease of operating back pressure increased with the above parameters.The performance advantages of the evaporative condenser system will be fully played when the direct aircooling unit operates with higher load at higher air temperature.