Based on technical features of non-reheat 200 MW double-extraction steam turbine unit manufactured by ABB Company and equipped in one power plant

the thermodynamic properties of said unit have been studied on the basis of calculation under standard operating conditions and off-design operating conditions

the graph of operating conditions for double-extraction unit being drawn.At the same time

a multi-component characteristic equation reflecting the relationship among four variables

i.e.the main steam flow rate of unit

the industrial extraction steam flow rate

the extraction steam flow rate for heating

and the electric power

has been fitted

providing simple

easy

rapid

and practical method for studying the thermodynamic properties of double-extraction unit and for on-line optimization of load distribution.