Combustion Diagnostics And Measurement Of Flame Temperature In Msw Incinerator Based On Visible Radiation

Waste incineration power generation technology is increasingly being applied to the processing of municipal solid waste because of its innocuous and resource. The research on waste incineration power generation started late in our country. At the same time the complex composition of municipal solid waste, higher moisture content and the large fluctuations of calorific value lead to many operation problems such as fouling, corrosion and excessive emissions. It is significant for the safely running of incinerator to detect the combustion state online. Flame temperature is considered as one of the important parameters which reflect the state of combustion. Amount of information related to flame temperature and radiation parameters can be obtained with the temperature measurement method based on visible radiation theory. Then the average flame temperature and emissivity can be calculated which help to reflect the combustion state.In this paper, taking the NO.1 incinerator in GCL(Xuzhou) Renewable Energy Generation Company for the study, designed a system of flame image online detection based on visible radiation intensity. The system obtained the flame image with the color CCD as which has a good photoelectric conversion characteristics in the visible wavelength range of 350~760nm. The flame average temperature was calculated with the two-color method with the image of radiation intensity. The experiment results indicated the system could accurately achieve the online conversion from flame image to temperature image. The results of online detection experiment with the flame image online detection system showed that the system is reliable.The gray property is the basic of the two-color method, the flame spectroscopy analysis showed that: there are two strong emissions of Na(589nm) and K(769nm) occurs in the visible spectrum of the flame and the two-color method could not be used to calculate the flame temperature because the continuous spectrum 500 nm to 790 nm is not met the gray property. In order to use the two-color method to calculate the flame temperature in the incinerator, we amended it with the emissivity of the red(610nm), green(530nm) channels in the CCD calculated by soot model. The results showed that flame temperature calculated with the amended two-color method could accurately reflect the combustion state in the incinerator.Finally, the paper analyzed the combustion state in the incinerator after the real-time detection of flame temperature through the transform of flame image to temperature image. The analysis results indicated that in order to ensure the stability combustion we need to feed fuel timely when the flame temperature is reduced to about 950℃; the amount of SO2、NOx in gas rise with the increase of flame temperature but it is just the opposite of the HCl, so we may seek the optimum flame temperature corresponding to the lowest pollutant emissions by analyzing the changes of the three above; The phenomenon of deposition is easy to occur as the presence of alkali metal founded during the flame spectroscopy analysis in flame and which could be effectively reduced through the control of combustion flame temperature.