Concurrent Measurement of 2-D Temperature Distributions and Radiative Properties of Pulverized-coal-fired Flame in a 670 t/h Boiler Furnace

摘要

Both temperature distributions and radiative properties play important roles in boilers and furnaces. Based on radiative imaging models, the 2-D temperature distribution and radiative properties can be simultaneously reconstructed from the boundary radiative information detected by image detectors. In this paper, the 2-D temperature distributions and radiative properties of pulverized-coal-fired flame in three typical cross-sections of a 670 t/h boiler furnace were measured. At the same time, the particles in the three cross-sections of the furnace were sampled and then, the chemical compositions, shapes and size distributions of the particles were given. The experimental results showed that the measured 2-D temperature can be used in combustion diagnosis, and the radiative properties in the burner area of the furnace are larger than those in the outlet of the boiler furnace. The value of measured radiatvie properties is proportional with the carbon content in sampled particles. The radiative properties of smooth ash are smaller while those of porous char are larger.