Knowledge Management System Of Institute of process engineering,CAS
|Thesis Advisor||宋文立 ; 都林|
|Place of Conferral||北京|
|Keyword||Dcs 雷达 料位 信号处理|
Abstract The technique of DCS has been broadly used for industrial automatic control. However, the application of radar for real-time distance measurement with high precision and high steadiness, is still restricted to those simple systems like liquids or static medias with little disturbance. For complicated processes in metallurgy, coal coking, and cement industries, the bulk material level mater was merely used for long distance measurement (commonly from several meters to tens of meters) with no requirement of real-time, and can just give an approximate result. Herein, the work is to establish a method for level measurement in the process of coal pyrolysis at 600?C within a short distance of 2 meters through a radar, and establish a system for level control based on the feedback of the measuring signal via a DCS platform.It was found that there were two major factors affecting the radar measuring reliability. The first one relates to the design and application environment of the radar including the structure and the size of the equipment. It could be improved by design . The second one relates to a signal processing of the instrument, since the echo signal obtained in complicated conditions cannot be directly used for an accurate calculation. It could be solved by improved algorithm for signal processing using the software.In this work, a water-cooling system, a bending tube, and a prolonged wave guide section were applied to avoid a high temperature radiation, by which the instrument can be used in 500-800oC conditions. The installation of purging nitrogen can effectively inhibit the tar induced agglomeration and eliminate the influence of dust. The signal interference caused by the movement of particles could be avoided by adding dynamic limiter and deviation threshold to the algorithm for signal spectrum analysis, after the transformation of FFT, through which, the instrument measuring reliability was improved.
|于海洋. 高温粉尘工况下雷达料位测控系统的研究[D]. 北京. 中国科学院研究生院,2016.|
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