Waste heat cycling heating power circulating system device of engine

The invention discloses a waste heat cycling heating power circulating system device of an engine. The system composition is that an exhaust pipe of the engine is in series connection with a thermoelectric generator and an evaporator. The working medium side of the thermoelectric generator is in series connection with the evaporator, an expander, a heat regenerator, a condenser, a working medium pump and the working medium side of a preheater in sequence through pipelines and returns to the thermoelectric generator through the low-temperature side of the heat regenerator, and a closed circuit circulation system is formed. Bypass valves are respectively arranged between an inlet on the high-temperature side of the heat regenerator and an outside outlet pipeline and between an inlet of the preheater and the outside outlet pipeline. By the utilization of an automatic electrical control system, temperature and pressure of six points of a heating power circulating system are monitored, and the opening and closing of two bypass valves are controlled so that an optimum flow of a working medium of the system is ensured. The waste heat cycling heating power circulating system device overcomes the shortcomings of waste heat recycling of the engine in the prior art, and achieves step utilization of waste heat of the engine and the purposes of improving economy of fuel oil of the engine and reducing emission.