The flue gas temperature at economizer outlet was too high in a 1 100t/h power plant tower type boiler

which can not ensure the normal operation of the selective reduction catalytic(SCR)denitration devices.Thus

a high temperature heat exchanger was installed at the economizer outlet

and the flue gas temperature at the SCR device inlet was effectively reduced

which ensured the safe and steady operation of the SCR catalyst.Moreover

the high temperature heat exchanger can be applied to heat the condensate to crowd the low-pressure steam extraction

therefore

the net coal consumption of the unit decreased by about2.34g/(kW·h)

indicating the energy saving benefits were great.