Study on Dynamic Load Response of an Ultra Supercritical Unit Caused by Condensate Throttling

Based on conservation equations of mass and energy in the low-pressure heating system of an ultra supercritical unit, a relationship model of condensate flow and unit load was established by studying the dynamic relations between above two variables, to which a numerical simulation was conducted according to the heat balance diagram and structural parameters of a 1000 MW ultra supercritical unit, so as to provide theoretical basis for the control of condensate throttling and unit load in thermal power plants. Results show that the transfer function of condensate flow and unit load can be regulated by changing the condensate flow under rated conditions; the gain coefficient of transfer function increases and the time constant reduces with the rise of unit load under different working conditions.