PYROMETRIC PARTICLE TEMPERATURE-MEASUREMENTS IN A PRESSURIZED FLUIDIZED-BED GASIFICATION REACTOR

A fiberoptic pyrometric technique for the measurement of the temperatu re of a fuel particle in a fluidized bed reactor is presented. In the fiberoptic pyrometry the thermal radiation emitted by bed and fuel par ticles is collected and transmitted to a radiometric unit by an optica l lightguide immersed into the reactor. The radiation intensity is mea sured on two narrow wavelength bands and temperatures of the bed and i ndividual fuel particles are determined from these signals. Experiment al results obtained in an industrial pressurized fluidized bed gasific ation pilot plant of 15 MW of thermal power are reported. The temperat ure of the fluidized bed was 1140-1215 K and the pressure in the react or was 1.6-2 MPa. A large number of fuel particles both hotter and col der than the surrounding bed were clearly detected. For the hotter par ticles the temperature elevation with respect to the bed was typically 40-100 K.