The Analysis On Heat Transfer Characteristics Of Heating Surface In Supercritical Boiler

The paper analyzed steam temperature control and its influences, along with the heat transfer characteristics of every heating surface about a 600MW supercritical boiler in a plant power. Superheated steam temperature is adjusted by coal-water ratio, and then reheated steam temperature is adjusted by changing the open level of Flue baffle. In view of coal-water ratio change as well as working substance hot physical property change under different operating conditions, we observe the change of the intermediate point temperature, and the paper makes the quantitative analysis research on the working substance heat absorption characteristic and heat transfer coefficient's change characteristic of radiation superheater and convection superheater as well as the repeater. The experiments show that heat transfer of screen superheater which takes the radiative transfer initiative plays a leading role on the superheater system's heat absorption capacity change and the steam temperature characteristic, and is most effected by the steam current capacity and the working substance hot physical property, next for high temperature superheater. The reheater heat absorption capacity and the heat transfer coefficient mainly concern with the steam warm accommodation.