Diagnosis of thermal efficiency of power station by heat balance analysis method

摘要

The thermal efficiency of thermal power stations is a topic of ever-growing interest in view of saving fuel resources and reducing cost. When the thermal efficiency is reduced at a thermal power station, it is very important to identify which equipment caused the change. In order to make more accurate diagnosis of plant efficiency a "thermal efficiency diagnostic technique applying the heat balance analysis method" has been developed. The method is characterized by taking the data on generator output, which is the most precise among all plant equipment, as the standard value to analyze the heat balance of the plant in operation. What's more, iterative calculation is converged to minimize any deviations in data of individual items in overall plant whose precision is difficult to certify. The technique has been applied to two thermal power stations in which outputs are 1,000 MW and 600MW of the TEPCO.