Research And Development Of High-temperature Field Measurement And Burner Design Of Oxygen-fuel Combustion

Using oxygen-fuel combustion with petroleum coke is an attempt to explore clean combustion technology, which has a huge market prospect. Due to the high calorific value of the petroleum coke and the high temperature field of the oxygen-fuel combustion, it’s so important to research the temperature measurement and the thermal properties of the burner. This paper aims to study the high temperature measurement technology and the development of an oxygen-fuel burner for petroleum coke, I researched the high temperature measurement performance of the3CCD system by comparing different temperature measurement instruments, I discussed the thermal properties of the oxygen-fuel burner by analyzing the data of temperature, heat flux density and flue gas.In this paper, the two-color thermometry method, which based on the multicolor CCD camera, is be improved to the3CCD Individual Exposure Two-color Thermometry (3CCD-IETT). The research shows that3CCD-IETT can expand the temperature measurement range obviously, the temperature range can be expanded to more than140%than before by setting the appropriate exposure time of RGB channels; the calibration with black-body furnace will never be a problem by using the linear interpolation method, we can choose the most suitable parameters of RGB exposure time to obtain the most appropriate gray levels of RGB channels;3CCD-IETT with the RB channels has higher accurate temperature measurement values than RG channels and RGB channels, by revising the fume and emissivity errors of the3CCD-IETT, the temperature measurement values of it are more close to the real temperature.We designed a new oxygen-fuel burner for petroleum coke and we did some thermal tests for it, the burner is suitable for oxygen combustion and air combustion. We studied the temperature-field by three temperature measurements:3CCD-IETT, infrared thermal imager and infrared pyrometer. The results show that the temperature measured by the3CCD-IETT is higher than the others, the temperature measured by the infrared pyrometer has a bigger error than the others; by revising the errors of the 3CCD-IETT system, it can get the color temperature of the flame, which is the closest data to the real flame temperature. We modified the flame temperature measurement model of the infrared thermal imager, and got the function of the flame emission based on the color temperature data of3CCD-IETT, finally the temperature data of the infrared thermal imager is more close to the color temperature data of the3CCD-IETT. By analyzing the flame temperature and heat flux density of the inside wall of the furnace, we know that in the oxygen combustion conditions, when changing the flow ratio (>1or<1) of the secondary oxygen, the temperature field and the heat flux density increase, while in the air combustion conditions, when raising the flow amount of the secondary air, the temperature field and the heat flux density increase. However, the tendency will slow down finally. The flue gas data shows that using the center pipe to convey petroleum coke and secondary oxygen for combustion will cause the lack of oxygen in some areas in the furnace, so CO concentration will increase sharply, when changing the flow ratio (>1or<1) of the secondary oxygen, the CO and SO2concentration will increase while the NO will decrease.