The effect of adding low-pressure economizer on the unit thermal performance was introduced

and the calculation method of the unit thermal performance index was put forward.Moreover

Taking a300 MW unit as the example

the thermal performance tests were conducted for the unit before and after the low-pressure economizer was added.The variations of boiler efficiency

steam turbine heat consumption rate

unit net coal consumption rate and other parameters were obtained.The results show that

after the low-pressure economizer was added

the boiler efficiency increased by 1.41%

the unit coal consumption rate reduced by 2.2g/(kW·h)although the turbine heat rate increased by 64.5kJ/(kW·h).The unit equipped with low-pressure economizer achieved objective energy-saving effect.