Heat transfer characteristics of fluidized bed heat exchanger in a 300 MW CFB boiler

In order to investigate the heat transfer characteristics of fluidized bed heat exchanger (FBHE), a series of experiments was carried out in a commercial 300 MW circulating fluidized bed (CFB) boiler with FBHE. The parameters of steam, solids and air in FBHE were measured at different boiler loads, based on which the absorbed heat and heat transfer coefficient were calculated. Further study indicates that when the calculated results are applied to the design of large-scale CFB boilers, the bed side heat transfer coefficient in FBHE can be simplified as the function of solids temperature and flow. Therefore, the empirical model of heat transfer coefficient at bed side is put forward. The deviation between calculated results and measured values is acceptable in engineering application. This model provides strong support for the FBHE design in 600 MW supercritical CFB boilers.

In order to master the heat transfer characteristics of fluidized bed heat exchanger (FBHE), a series of experiments were carried out in a commercial 300 MW Circulating Fluidized Bed (CFB) boiler with FBHE. The empirical model of bed side heat transfer coefficient is put forward, and the deviation of calculated results and measured values are acceptable in engineering application.Figure optionsDownload as PowerPoint slideHighlights
► The parameters in FBHE were measured, and HTC were calculated.
► The HTC in FBHE is simplified as the function of solids temperature and flow.
► The empirical model of HTC at bed side is put forward.
► This model provides strong support for the FBHE design in SCCFB boilers.