Over the past 20 years,the development of writing pedagogy and research has transformed the traditional feedback mode,with teacher written feedback often complemented with peer feedback,oral conferences,and computer-mediated feedback.

With already ascertained fuel composition and steam parameter, the author, starting from the exhaust gas temperature, and using a reversed heat balance calculation method, determine surface position as well as the latter s of fouling; thus realizing online monitoring the parameters on the boiler s flue gas side, which same as guide for proper boiler operation.