By combining the equivalent exergy-drop with thermal economics method

the equivalent exergy-drop quality coefficient matrix equation was established

on the basis of equivalent exergydrop quality coefficientθe.Thus the equivalent exergy-drop quality coefficientθe which can reflect the energy level of each thermal device in thermodynamic system was obtained

so as to conduct economic comparison of the unit energy saving transformation schemes.The thermal system was divided

and the thermal economics supplemental equation was improved to establish the supplemental matrix equation.Finally

this thermal economic analysis method was applied on a 315MW coal-fired unit and verified through comparison with the existing exergy cost method.This algorithm was entirely given by matrix

which made the calculation of exergy cost more simple and provided a reference for thermal economic analysis on thermal systems.