A METHOD FOR TEMPERATURE-MEASUREMENTS IN CIRCULATING FLUIDIZED-BED COMBUSTORS

A method for measuring the local suspension temperature with a shielded thermocouple in the combustion chamber of a circulating fluidized bed (CFB) boiler is described. The report also includes an estimation of the error in the local temperature measurement due to radiation losses and some test results in the 12 MW(th) circulating fluidized bed boiler at Chalmers University of Technology, Goteborg, Sweden. A typical suspension temperature distribution in the combustion chamber of the CFB boiler is provided, and the estimated uncertainty is found to be below 4%, corresponding to 25-degrees-C at normal operating condition. The experimental results are compared with available data in the literature.