In order to increase the variable load rate of circulating fluidized bed(CFB) units

a fast variable load method is proposed based on condensate throttling and heat network energy storage utilization according to the difference between the response of the boiler side and the steam turbine side of the thermal power unit. Firstly

the mechanism model of the extraction steam system and steam turbine is established

and the theoretical value of load under multiple operating conditions is calculated to verify the accuracy of the above model. Then

the heat storage of the extraction steam system is analyzed

and the quantitative calculation model for heat storage of deaerator and heat network is established based on condensate throttling. The main factors affecting the heat storage capacity of the CFB heating units are analyzed. Finally

the response characteristics of heat storage and load are put forward.The results show that

the CFB heating unit has limited adjustable condensate flow due to the slag cold link

and the heat storage of the deaerator is smaller than that of the pulverized coal furnace. The heat storage of the heating network is a huge heat storage body

its full utilization can provide a considerable load rise

and the short-term fluctuations have no effect on the overall heating network. The combination of the above two methods can shorten the variable load time by up to 4 minutes under heating conditions.