Study On The Radiative Properties And Temperature Profile Determination Of Participating Media In Rotary Kiln

Incinerating the wastes has become the main way in developed countries because of its wide adaptability and other obvious advantages. Some incineration plants also have been established in our major cities. However, it's reported that waste incineration has become the main source of the formation of dioxin-like c ompounds.It's widely accepted that the formation of dioxins is closely linked to the kiln temperature distribution, while the temperature distribution of the incinerator is important for the stable operation of burning system and reduction of slagging. However traditional power station boilers and waste incinerators are still using thermocouples for temperature monitoring, which can not reflect the actual temperature field of the incinerator. So we tried to reconstruct the temperature distribution of a kiln incinerator.The radiative property of the solid particles was discussed and calculated based on Mie scattering theories. The line-by-line model and band model have been used to calculate the absorption coefficient of molecular gases, and we found that the band model is good enough for engineering. Then we used fluent to simulate the combusting in a kiln incinerator, obtained both the temperature distribution and gas concentration distribution. Then the radiation parameters of the medium were calculated for the emissivity setting of a Infrared Thermograpic Camera.At last we attempted to reconstruct the 2D temperature distribution of a rotary kiln hazardous waste incinerator. A reconstruction model of temperature distribution based on the back-Monte Carlo method was proposed, using the flame images captured by charge-coupled device cameras. A matrix-decomposition-based least squares algorithm was introduced to reconstruct the emission intensity distribution in the kiln sections. The proposed method was found to be capable and effective through practical approaches.