Adopting the partial differential theory

the conversion coefficient of extraction steam has been defined

the said coefficient means the ratio of the squeezed extraction steam converting to equivalent steam consumption when pure heat from heater of one stage joins into the system under constant flow condition

and reflecting also the quality of extraction steam from each stage.Dividing the components of auxillary steam-water into four kinds

the generalmatrix for conversion coefficient of extraction steam has been derived

so as to realize the calculation of computerized programme

providing a new method for calculating the cyclic steam consumption.At the same time

the conversion coefficient of extraction steam can be also used to fulfil the local quantitative analysis of the economic efficiency for non-reheated units.Taking N100-90/535 unit as example

calculation and analysis has been carried out

verifying the effectiveness of said method.