| The key of the combustion flame temperature measurement is the real-time and efficient collection of image signals from the combustion flame.Traditional image acquisition system mainly uses analog CCD?charge-coupled device?camera,the collected video signal for the analog signal,with coaxial cable transmission.The transmission quality of the analog signal is susceptible to the influence of the transmission distance.The farther the transmission distance,the image quality is worse due to the external environment.Based on Gigabit Ethernet technology to transmit digital signals,the transmission distance and signal quality are better protection,and Ethernet interface is a variety of computer standard configuration.In this thesis,a set of combustion flame temperature measurement system is developed based on Gigabit Ethernet interface camera,and the system is used in laboratory oxygen-enriched combustion flame and temperature measurement of pulverized coal flames in cement kiln.Details are as follows.According to the system design ideas,the composition of the combustion flame temperature measurement system of the hardware and equipment of the structure and performance of a detailed analysis and comparison,as a basis to determine the equipment to meet the requirements.The use of programming software for system software development,including three functions of the software developments:image acquisition,image processing and historical query.After the hardware selection and software development,the CCD camera and lens are calibrated by the blackbody furnace,and the linear relationship between the intensity of the flame image and the absolute radiation intensity of the blackbody furnace is obtained.After the system development is completed,the accuracy of the system temperature is verified by setting the temperature of the blackbody furnace.The results show that the maximum relative error of the measured temperature is less than 1%.The system was used to measure the combustion flame temperature distribution in the O2/N2 atmosphere under different working conditions.The two-dimensional distribution of the flame temperature under the three conditions,air condition and oxygen concentration was 30%,40%and 50%,respectively.The results show that the maximum temperatures of the four conditions are 2124 K,2298 K,2450 K and 2560 K,respectively.In the air condition,the maximum temperature of the flame is 31K,less than 1.5%,compared with other scholars.The flame temperature gradually increases from the flame center to the edge,and the maximum temperature increases with the increase of oxygen concentration.After the function and stability of the system software are improved,the system is tested on the on-line test of the flame temperature in a cement rotary kiln.After several debugging,the system has been stable in the cement rotary kiln.The flame temperature range measured in the system is between 1920 K and 2073 K,and the function meets the requirements.The test results verify the feasibility of the flame temperature measurement system developed for flame temperature measurement of cement rotary kiln. |
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