A method for calibrating the calorific value of fuel for improving the accuracy of estimation of the efficiency of the thermal power plant

摘要

In a thermal power plant, from the material and heat flow of the boiler (1), water heater (2) and deaerator (3), turbine (4), and recuperator (5), the main steam quantity (Fmstm), the turbine outlet steam quantity (Fci ), supplemental water quantity (Fmuw), condensed water quantity (Fco), boiler supply quantity (Fbfw), blowdown quantity (Fbdw), heat quantity (Qmstm), turbine outlet steam heat quantity (Qci), the turbine 4 and the water supply Additional heat (Qestm), supplemental water heat (Qmuw), condensed water heat (Qco), boiler feed water heat (Qbfw), blowdown heat (Qbdw), boiler heat loss to the heater (2) and the deaerator (3) (Qloss), main steam temperature (Tmstm), brewing temperature (Testm), turbine outlet steam temperature (Tci), supplemental water temperature (Tmuw), condensate water temperature (Tco), boiler feed water temperature (Tbfw), blowdown temperature (Tbdw), main steam pressure (Pmstm), bleed pressure (Pestm), turbine outlet steam pressure (Pci), replenishment water pressure (Pmuw), condensate water pressure (Pco), boiler feed water pressure (Pbfw), blowdown pressure Defined as (Pbdw), calculate the enthalpy of water/steam using the measured temperature and pressure to calculate the heat balance, and apply the SQP (Successive Quadratic Programming) method represented by GRGII (brand name: Generalized Reduced GradientII). In order to optimize the error between the test value and the measured value of the mass balance and the heat balance, a method for correcting the calorific value of fuel for improving the efficiency prediction accuracy of a thermal power plant; The calorific value correction method further includes at least performing an optimization correction of an error between an experimental value and a measured value of the material and heat flow.