Project Introduction: Combined Station Oilfield Sewage Heat Pump for Waste Heat Recovery The project is based on the basic working principle of a compression heat pump, and has developed a waste heat recovery heat pump device that recovers heat from sewage discharged by a three-phase separator for heating incoming fluids at the station. This device extracts the heat from the sewage before reinjecting it into the ground, thereby replacing the original gas or fuel boilers, saving fuel consumption, and reducing production costs. Calculations using the Changqing Oilfield as an example show that the overall operating energy cost can be reduced by about 60%, and the more fuel boilers compared to gas boilers are used, the more significant the energy savings. The entire Changqing Oilfield's crude oil dehydration process will be comprehensively implemented with heat pump waste heat recovery energy-saving retrofits, theoretically saving up to 164 million to 616 million yuan in energy costs per year, with very significant economic benefits. The investment recovery period for the project is between 1.5 and 4 years. The project is currently in a market gap phase. Energy-saving technologies and equipment for chemical production, such as heat pump distillation, involve numerous separation processes like evaporation, concentration, distillation, crystallization, and drying. These processes consume vast amounts of energy as the heat source for the tower kettle and also require a significant amount of cooling water to condense the vaporized products at the top of the tower into liquid form. Against this backdrop, our project proposes an energy-saving retrofit technology based on compression heat pump technology, suitable for such process operations. The basic idea is to compress the gaseous material at the top of the tower with a compressor, raising its temperature before using it to heat the liquid material in the tower kettle. At the same time, the compressed gas condenses into a liquid product at the top of the tower, forming a set of compression heat pump distillation (distilling) processes and their complete sets of equipment. Prospects: Compared to the existing process where steam is used at the bottom of the tower to heat liquid materials and cooling water is used at the top of the tower to condense gaseous products, the technical solution of this project realizes the recycling of energy within the system. The bottom of the tower no longer requires heating steam, and the top of the tower no longer requires cooling water, thereby saving more than 50% in energy and water consumption. The economic and environmental benefits are extremely significant.