In the view of the problem that the heat consumption rate calculation is inaccurate in present power plants

a new calculation method for real-time heat consumption rate based on power measurement is developed in this paper.Firstly

through the analysis of design data and thermal performance test results

the operating characteristics of steam turbine were obtained

and the extraction steam and entrance steam parameters of each heater were also obtained as well as the low pressure cylinder efficiency

which completes the loss of field monitoring data.Secondly

the thermal system model of the power plant was established based on the power measurement

according to the principle of thermal equilibrium

material balance and energy conservation.To get the heat consumption rate in real time

the counterbalance method was employed to calculate the extraction steam flow in different tubes and main steam flow rate without measuring the condensate flow.Finally

this method was applied on a 600 MW unit and the monitoring results were compared with that calculated by the SIS.The results show that this power-based model has high accuracy and stability in heat consumption rate calculation

which provides technical support for accurate evaluation of power plant thermal efficiency.