Heat pump and water vapor compressor cascade steam system

The utility model provides a heat pump and water vapor compressor cascade steam system, and belongs to the technical field of waste heat recovery. The system comprises a heat pump, a flash evaporation system and a steam compression system, the heat pump is connected with a waste heat source through a pipeline, and a low-temperature heat conversion structure in heat exchange connection with the waste heat source is arranged in the heat pump. The heat pump can absorb heat of various low-temperature waste heat sources through the low-temperature heat conversion structure, water in the high-temperature water preparation structure is heated through the absorbed heat, heated hot water is input into the flash evaporation system to be subjected to flash evaporation, saturated steam is prepared, waste heat is effectively recycled, meanwhile, the quality of heat energy is improved, and the energy consumption is reduced. And finally, through compression, saturated steam formed by flash evaporation is pressurized into hi