Steam condensing device for heat-engine plant steam turbine

The utility model relates to a steam condensing device for a steam turbine of a thermal power plant. The steam condensing device comprises a steam condensing chamber communicated with an exhaust pipeof the steam turbine, a liquid collecting chamber arranged below the steam condensing chamber and communicated with the steam condensing chamber, a heat preservation chamber arranged on the outer sideof the exhaust pipe of the steam turbine in a covering mode and an air exhaust backflow mechanism arranged on the side wall of the steam condensing chamber. And a condensing pipe is arranged in the condensing chamber. And a heat exchange pipe spirally wound on the periphery of the exhaust pipe of the steam turbine is arranged in the heat preservation chamber. The air exhaust backflow mechanism comprises an air exhaust pipeline installed on the side wall of the steam condensing chamber and communicated with the steam condensing chamber, an air pump arranged on the air exhaust pipeline and a backflow pipeline communicat