Operation analysis of a central heating system with exhaust heat cascade recovery

Based on the energy utilization idea of “grade counterpart and cascade utilization”, constructs a centralized heating system with waste heat cascade recovery. The operation data of a practical project show that the total waste heat recovery of the system is 649 100 GJ, 79.16% of which is recovered directly from the condenser by low vacuum technology, and 20.84% is recovered by absorption heat pump technology. The energy saving rate of the project is 49.11% and the reduced standard coal consumption is 34 thousand tons. The research results can be used for reference in project design and operation regulation of urban central heating system with waste heat recovery.