8th Thermal and Fluids Engineering Conference (TFEC)
Concurrent spectroscopic measurement of emissivity and temperature of burning single coal particles
Temperature and spectral emissivity are parameters of outmost importance in the analysis of combustion systems. For certain small objects their surface temperature and spectral emissivity needs to be acquired with non-contact measurements. This research is aiming at a non-contact method for concurrently determining the surface temperature and emissivity of burning single coal particles using multi-wavelength spectrometry. The coal particles were in the nominal range of 75−90 µm, as classified by sieving. Single particles of coal, were injected in an electric drop-tube furnace heated to 1400 K. Subsequently, the particles were burned in air, one at a time, in a drop tube furnace (DTF) under high temperature and high heating rate conditions. Ignition took place close to the injector tip at the top of the drop-tube furnace, immediately after entering the radiation zone. Upon ignition, volatile matter flames formed around particles and grew bigger with time. Spectrometric observations of a number of those particles were conducted from the top of the furnace injector, viewing downwards the central axis of the furnace along with a particle's path line over a range of wavelengths (600−1000 nm). Both the luminous volatile matter flames and the burning chars were observed. Results will be compared with values published in the literature.