Gas-fired hot-blast stove plays an important role in the field of industrial ironmaking. Therefore, the temperature measurement and monitoring of gas-fired hot-blast stove is particularly necessary. However, the traditional temperature measurement method has the disadvantages of high cost and inconvenience. A new type of temperature measurement method, distributed optical fiber temperature measurement, is applied to gas-fired hot-blast stove. Distributed optical fiber temperature measurement technology is a new high-tech for real-time measurement of spatial temperature field data in recent years. It is based on optical time domain reflectometry (OTDR) and Raman scattering temperature measurement principle.
The key part of this technology is signal demodulation. Therefore, this paper synthetically studies various demodulation methods of distributed optical fiber temperature measurement and the characteristics of gas hot blast stove temperature measurement, and innovatively proposes a dual-terminal dual-channel demodulation method (DTDC). The application of distributed optical fiber temperature measurement technology based on DTDC demodulation in gas hot blast stove is introduced in three parts. Taking the gas hot blast stove as the research object, this paper introduces the research background and significance of the subject, the research status of gas hot blast stove temperature measurement and distributed optical fiber temperature measurement at home and abroad, and the necessity of putting forward a new demodulation method.
Starting from the development of gas hot blast stove temperature measurement and the existing demodulation methods, this paper puts forward some problems, then puts forward solutions to the corresponding problems, and obtains the overall structure design of the system, which is mainly divided into two modules: hardware and software. The hardware structure is mainly composed of light source, sensing optical fiber, optical switch, wavelength division multiplexer (WDM), photoelectric detector and signal acquisition and processing module combined with FPGA and DSP. The software module includes the program design of data acquisition, denoising and demodulation, as well as the environment configuration, and the program settings of the connection between hardware and PC.
The performance test of the temperature measurement system combined with software and hardware is carried out. It is concluded that DTDC is superior to other demodulation methods by comparing different demodulation methods in the laboratory. Then the temperature measurement accuracy and resolution of the system are tested. The results meet the requirements of the industrial field of gas hot blast stove. This paper is devoted to applying the new research results of distributed optical fiber temperature measurement to the temperature measurement system of a steel gas hot blast stove, and testing the temperature measurement accuracy and spatial resolution of the system. The test results show that the temperature range of measurement is between - 10 200 C, the larger error of temperature measurement is not more than 0.5 C, and the positioning accuracy is 0.5 m, which meets the industrial requirements. It has good theoretical significance and application prospects in the field of gas hot blast stove temperature measurement.
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