Estimation of radiative properties and temperature distributions in coal-fired boiler furnaces by a portable image processing system

Abstract This paper presented an experimental investigation on the estimation of radiative properties and temperature distributions in a 670 t/h coal-fired boiler furnace by a portable imaging processing system. The portable system has been calibrated by a blackbody furnace. Flame temperatures and emissivities were measured by the portable system and equivalent blackbody temperatures were deduced. Comparing the equivalent blackbody temperatures measured by the portable system and the infrared pyrometer, the relative difference is less than 4%. The reconstructed pseudo-instantaneous 2-D temperature distributions in two cross-sections can disclose the combustion status inside the furnace. The measured radiative properties of particles in the furnace proved there is significant scattering in coal-fired boiler furnaces and it can provide useful information for the calculation of radiative heat transfer and numerical simulation of combustion in coal-fired boiler furnaces. The preliminary experimental results show this technology will be helpful for the combustion diagnosis in coal-fired boiler furnaces.

[1]  Kimura Toru,et al.  Prediction method of unburnt carbon for coal fired utility boiler using image processing technique of combustion flame , 1990 .

[3]  János M. Beér,et al.  Combustion technology developments in power generation in response to environmental challenges , 2000 .

[4]  Chun Lou,et al.  Deduction of the two-dimensional distribution of temperature in a cross section of a boiler furnace from images of flame radiation , 2005 .

[5]  Y. Satoh,et al.  A Combustion Diagnosis Method for Pulverized Coal Boilers using Flame-Image Recognition Technology , 1986, IEEE Transactions on Energy Conversion.

[6]  M. Modest.  Radiative heat transfer , 1993 .

[7]  Fei Wang,et al.  The research on the estimation for the NOx emissive concentration of the pulverized coal boiler by the flame image processing technique , 2002 .

[8]  Chun Lou,et al.  A NEW MODEL OF RADIATIVE IMAGE FORMATION USED IN VISUALIZATION OF 3-D TEMPERATURE DISTRIBUTIONS IN LARGE-SCALE FURNACES , 2002 .

[9]  Yong Yan,et al.  Monitoring and characterisation of pulverised coal flames using digital imaging techniques , 2002 .

[10]  M. Pinar Mengüç,et al.  Radiation heat transfer in combustion systems , 1987 .

[11]  Huaichun Zhou,et al.  A simple measurement method of temperature and emissivity of coal-fired flames from visible radiation image and its application in a CFB boiler furnace , 2009 .

[12]  Huai-Chun Zhou,et al.  Experimental investigations on visualization of three-dimensional temperature distributions in a large-scale pulverized-coal-fired boiler furnace , 2005 .

[13]  Marcus Aldén,et al.  Combustion at the focus: laser diagnostics and control , 2005 .

[14]  Yong Yan,et al.  Vision-based measurement of temperature distribution in a 500-kW model furnace using the two-colour method , 2000 .

[15]  Chuguang Zheng,et al.  Visualization of three-dimensional temperature distributions in a large-scale furnace via regularized reconstruction from radiative energy images: numerical studies , 2002 .