Study On Key Technology Of Raceway Of Blast Furnace Temperature Field Reconstrution Based On Radiation Image

The raceway is a cavum which coke is circularly moved at the upper of combustion strip. The temperature field distribution of raceway play an important role in continuous and steadily production through evenly descend of the upper charging of the blast furnace, the drippage of melted slag and iron, the gas distribution. With the improvement of the injected pulverized coal technology and aggrandizement of blast furnace cubage, it is an important role in strengthened smelt of the blast furnace and ensure the quality and output of the blast furnace.The reconstruction key technology of the raceway temperature field, which is based on CCD radiation imge, include the quality and heat transmission simulation of the raceway in the blast furnace, the dispersion medium radiation characteristics of the raceway, the CCD sensor imaging process at the direction of the blowtorch peephole, the computation model and experiment of radiation image and temperature field distribution of the raceway, the radiation energy transmission process and the three dimensional temperature field reconstruction arithmetic. According to this, this paper developed series theory and experiment studies, in which main results and innovation exists as follows:①Energy and quality transmission process simulation of the raceway. One of the main contents which are studied on the quality and energy transmission is carried out the temperature field reconstruction based on radiation image. It is a basic of developing a series of studies on the radiation characteristics of the dispersion medium in the raceway, the imaging process at the direction of the peephole, the relation model of the radiation image and the temperature field distribution, the radiation energy transferring process in the raceway and the industrial application at different blast temperature. The dynamics characteristic of the raceway is studied and the computation method of the raceway gemotery size and influence causes is provided, and the temperature field distribution, component and chroma distribution through k ?εequation, pulverized coal power volatilization and decompose model, simple chemical reaction eqation mix molecule equation. The flow field database is provided for computing the radiation characteristics of the dispersion medium.②The dispersion medium radiation characteristic computation of the raceway. The raceway temperature field reconstruction is carried out by radiation image at the direction of the blowtorch radiation image. One of the key technology is studied the radiation characteristics of the dispersion medium and the component kinds to compute the optical energy transmission process in the raceway. The spectrum of gas output ,such as CO2 and H2O steam, is computed through combined spectrum model, and the relation of the spectrum of the particles and mix combustion output between temperature in the raceway is get through Lorentz-Mie theory.③Study on the CCD imaging process at the direction of blowtorch peephole . The raceway imaging model and mechanism is studied. The imaging hypothesis is provided, and the computation results show it is almostly identical with CCD target imaging and virtual plane imaging. And because the problem of CCD super-saturation current output in the process of CCD untouched raceway high temperature measurement, so the CCD shutter control model is also provided to prevent from the super-saturation current output and exceed the CCD noise signal.④Study on the relation model about radiation image versus temperature field distribution at the suppose of gay ranceway. The 3-D temperature field reconstruction method is studied based on CCD radiation image. The single wavelength and dual-wavelength radiation measurement model is established through geometry imaging hypothesis condition. A seris of experiments were carried out for vertifying CCD shutter control model and relational model about radiation image versus temperature at the suppose of gay ranceway.⑤Three dimensional temperature reconstruction arithmetic and radiation energy transmission process study. The radiation energy transmission process along raceway and the computation of radiation transmission equation (RTE) is provided. The factor of radiation share parameters (αandβ), which is influenced coefficient matrix A are studied. The 3-D temperature field distribution and CCD target radiation energy distribution is analyzed in this paper.⑥Study on industry application. The industry application in raceway temperature field monitoring and 3-D reconstruction is studied at the basis of the raceway gray suppose and non-gray dispersion medium. The application results show that the radiation image of raceway directly reflect the radiant intensity, heat transmission of raceway. The reconstruction temperature geometry form distribution is almostly identify with the form distribution of the raceway. At the same time, the method can visually monitor the working states of of the raceway ,such as the temperature field distribtution, activity states, slide states of slag and cold stock and heat and quality transmission process. It is effective of instructing blast furnace operation through in-time information.The paper was Sponsored by National Natural Science Foundation of China and Shanghai Bao steel Group Co United Research Foundation (50374085) named by"The working state monitoring of the injected pulverized blast furnace". A series of experiment and theory studies were carried out for monitoring and reconstructing 3-D temperature field based on radiation image at the base of RTE. It studied the series key technologies which had tested and have practical and popularized values. .