Study On Combustion Monitoring And Adjustment Of Glass Furnace Based On Radiation Image Processing

Glass production consumes a lot of energy,mainly in the glass melting process.The furnace temperature field which is greatly affected by the combustion flame is related to the melting of the glass directly.If the combustion cannot be organized well,not only the quality of melting is difficult to guarantee,but also decrease the life and safety of furnace as well.Therefore,the monitoring of temperature distribution and flame characteristic information play an important role in improvement of the combustion efficiency,product quality and safe operation of the furnace.In this paper,the temperature distribution and flame characteristics of the glass furnace were monitored based on the radiation image processing technology,and the combustion adjustment was carried out by using the monitoring results.The main work is as follows:This paper described a method for calibrating the visible radiation.The color value was combined with the exposure time using the excellent linear response of light intensity in imaging system,which was used to avoid the calibration of multiple shutters.Then,the absolute radiation intensity was calculated by combining the spectral response efficiency function of the imaging system.And the calibration formulas were obtained by segmentation and logarithmic fitting.The relationship between the color value and the absolute radiation intensity was restored.And the error were less than 1.03%,calibration results were accurate and reliable.The self-developed glass furnace monitoring system was used to monitor the temperature distribution and glass melt surface bubbles in a horseshoe flame glass furnace.The monitoring results showed that,the temperature change in the furnace could reflect well the commutation characteristics of the combustion system,the flame center temperature was 2240-2400 °C.Recognition result of glass bubbles was consistent with the position and shape of the bubbles in the original image,which could reflect the changes of the bubbles accurately,and bubble rate remained at around 50%.Combined with the flame boundary threshold determination method,flame characteristics of glass furnace were monitored and analyzed,and the result indicated that the change trend of flame characteristic was consistent with the change of gas flow.The concept of flame comprehensive characteristic was proposed and used to adjust the combustion.Based on the maximum of the flame comprehensive characteristic adjusted with the secondary air,the mapping relationship between the gas flow and the maximum of flame comprehensive characteristic was established,and the combustion adjustment was also carried out.