WANG Lin, NIU Kun, GAO Jinghui, et al. Application of two-stage double-cycle flue gas waste heat utilization system[J]. Thermal power generation, 2019, 48(5): 14-17.
In order to ensure high efficiency of ultra-supercritical units in a wide load range
a combined flue gas waste heat utilization system with low temperature economizer and heater is proposed. This system consists of a number of water-flue gas heat exchangers arranged in stages and sections
and adopts independent double-cycle heating technology to realize deep cooling of boiler flue gas and high-energy utilization of low-level waste heat.The practical calculation shows that this waste heat utilization system of flue gas can reduce the average coal consumption of the unit by 2.72 g/(kW·h)
and remarkably improve the efficiency of the unit and the economy of the power plant at low loads.