Low-vacuum heating device for thermal power plant

The utility model discloses a low-vacuum heating device for a thermal power plant, and relates to the technical field of low-temperature afterheat recovery and centralized heating of the thermal power plant. The low-vacuum heating device comprises an absorption heat pump, a steam turbine, a condenser, a heat user and a heating network circulating pump, wherein the condenser is connected with the tail end of the steam turbine through a waste steam discharge pipeline; the heat user is connected with a circulating water heat exchange tube bundle in the condenser through a heat network water supply pipeline and a heat network return pipeline; and the heat network circulating pump is positioned on the heat network return pipeline or the heat network water supply pipeline. The low-vacuum heating device is structurally characterized in that: an absorber of the absorption heat pump and the heat exchange tube bundle in the condenser are connected in series with the heat network water supply pipeline; a heat exchange tube bundle in an evaporator of the absorption heat pump is connected in series with the heat network return pipeline; and a heat exchange tube bundle in a generator of the absorption heat pump is connected in series with a low/medium-pressure cylinder of the steam turbine through a low-pressure steam pipeline. Compared with the prior art, the low-vacuum heating device can effectively raise heat network water supply temperature, increase the heating radius of low-vacuum circulating water heating, and avoid potential safety hazards caused to the steam turbine and the condenser by over-high heat network return temperature.