The invention designs a power
plant waste heat utilization comprehensive
energy supply system combining fused salt with high-pressure hot water heat storage. The power
plant waste heat utilization comprehensive
energy supply system comprises a boiler, a fused salt heat storage subsystem and a hot water heat storage subsystem. The fused salt heat storage subsystem heats fused salt through boiler steam, and closed circulation is formed through a high-temperature fused salt tank, a low-temperature fused salt tank and a pump body. The hot water heat storage subsystem comprises a plurality of steam
converters, a
heat exchanger and a hot water heat
storage tank; wherein the first steam converter is arranged between the fused salt and the hot water subsystem, high-pressure hot water from the first hot water heat
storage tank is heated into steam through high-temperature fused salt, and the steam is used for driving a
steam turbine to generate
electricity or supplying heat to the outside through the third steam converter; and the second
heat exchanger is connected in series in the loop to recover boiler
tail flue gas
waste heat. Through
cascade coupling of fused salt and high-pressure hot water, the high-temperature hot water in the heat
storage tank is used for increasing the heat exchange water
inlet temperature, freezing and blocking during fused salt heat exchange are effectively prevented, the use amount of expensive fused salt is greatly reduced, flexible switching of power generation, heat storage and multiple
heat supply modes is achieved through multi-valve control, and the energy-saving and environment-friendly effects are achieved. The energy
utilization rate and the operation flexibility of the power
plant are obviously improved.