By absorbing the boiler exhaust heat

the low temperature condensing water from steam turbine was heated in phase change heat exchanger

thus the energy is saved.Taking a 135MW unit as the example

the calculation results showed that

after the phase change heat exchanger was applied

the standard coa l consumption decreased by 3.2g/(kW·h)

each unit can save standard coal of 2 400 tand reduce CO2 emission of 4 136tper year.The influence of crowding extraction from the phase change heat exchanger on vacuum of the turbine and on the power can be ignored.Several countermeasures were put forward to prevent the low temperature corrosion

ash deposition and wear of the heating surface

like applying high temperature brazing Ni-based full infiltrated layer material spiral finned tube for the phase change heat exchanger.