Font Size: a A A

Research On Temperature Detection System Of Boiler Flame Based On Image Processing Technology

Posted on:2003-06-22Degree:MasterType:Thesis
Country:ChinaCandidate:X D JiangFull Text:PDF
GTID:2168360065960834Subject:Circuits and Systems
Abstract/Summary:PDF Full Text Request
This paper mainly focuses on detecting the temperature of combustion flame in furnace. In this system, high temperature TVs are used to collect images, digital image processing technology is applied to process images, thermal radiation theory and plane surface array CCD's chroma theory are introduced and the three-colour method is discussed detailedly to detect the temperature. The main job includes the following aspects:1. According to the request of large area flame detection in modern furnaces, an idea named "Temperature Detection System Based on Boiler Flame TV and Digital Image Processing Technology " is decided. Basing on the mature and cheap high temperature TV, a whole system (including software and hardware) used to detect the temperature in boiler is set up. The experimental data are obtained from the above system and these date are used to modeling.2. The physical process of boiler flame combustion and radiation and the three-colour method using color CCD theory are studied. Mathematical model is constructed in order to explain the physical mechanism of flame temperature detection in boiler using CCD camera directly.3. A new temperature segmentation linear fitting method sieves the problem caused by the nonlinear mapping between the temperature data and the chroma. That is dividing the temperature into some sections from high to low. Different temperature section uses different formula. Thus, the detection precision is improved. The error which is caused by figuring out the distribution of the whole temperature field by only one formula is eliminated.4. According to the characteristic of flame image, we have finished the research that fit for flame image. It includes the following aspects: adopting the Partial Differential Equations and Neighborhood Average smoothing methods to reduce image noises. Mapping the RGB three-color and gray scale histogram to study-3-the relationship of flame features and temperature field distribution. The methods of calculate important parameters about the average gray value, the flame area and the flame shape center coordinate are given. Using temperature field with different color and equal temperature line with different color to display the temperature distribution.5. Use Visual C++ 6.0 as a tool to program an applied software-"Boiler Flame Temperature Analysis System". This system has the following functions. Firstly, a good human-computer interaction interface is given. The circumstance of boiler flame combustion is scouted real-time. The important feature parameters of flame, such as the structure, configuration and temperature, can be extracted. The temperature field distribution in a whole firebox is reconstructed. Use temperature field with different color and equal temperature line with different color to display the temperature distribution. The temperature of arbitrary point selected by Mouse can be showed. The important image data can be saved and printed in order to be analyzed later.This paper is dealed with the practical problem. Physical mechanism of the problem itself is deeply studied. The corresponding mathematic model is constructed. The advanced and proper processing method is adopt, and finally a useful system is designed.
Keywords/Search Tags:Combustion flame, Image Processing, Temperature Field, Plane surface array CCD, Three-colour Method
PDF Full Text Request
Related items