In view of the deficiencies of currently used waste heat utilization technologies

a new thermal energy cascade utilization system for coordinated waste heat and regenerative systems is developed. The system organically combines the regenerative cycle and the waste heat utilization from the boiler and turbine

which has intelligent allocation ability of heat flux direction

better parameter regulation performance and working condition adaptability. This system can optimize dynamically the thermal energy cascade utilization and improve the air preheater performance. Taking an air-cooled 660 MW unit as an example

adopting the traditional low-temperature economizer to recover the waste heat from flue gas can reduce the standard coal consumption rate of the power supply by 1.70 g/(k W·h) at the rated power condition and heat consumption rate by 1.08 g/(k W·h) at the acceptance conditions. After reconstruction of the coordinated waste heat and regenerative systems

the standard coal consumption reductions and heat consumption rate reduced by 3.19 g/(k W·h) and 3.74 g/(k W·h)

respectively. It save 150% energy more than that by the traditional scheme. The thermal economy can be greatly improved.