The Fault Diagnosis Methods And The Fault Diagnosis System Development Researching For The Bulk Oxygen-Making Equipment

The oxygen-making systems are indispensable in the industry production. The function is supplying the oxygen and nitrogen which is necessary for the industrial producing process. The fault diagnosis is becoming fully complicated because the oxygen-making equipments are becoming larger, more complex and automatic. The fault detection and fault diagnosis of the oxygen-making systems are attached more importance nowadays.The fault characteristics of the oxygen-making equipment are time delay and uncertainty. If we want to have a right equipment fault model, we must take the right algorithms to process the multi-sensor data, and that way must to be accurate. This paper presents a variety of the fault diagnosis methods, and the advantages and the disadvantages of all of these methods are discussed. This paper also introduces the basic principle and concept of data fusion, summarizes levels and model structure of data fusion, summarizes common algorithms and sorts them, and separately expounds D-S evidence theory and fuzzy integral, which includes the theoretical basis and algorithm realizing. Father the paper puts forward applying the fuzzy mathematics, D-S evidence theory and fuzzy integral to do the fault diagnosis work for the oxygen-making equipments. In the paper,the three algorithms are applied to the main heat exchanger fault diagnosis which belong to the oxygen-making system. It also presents the way that can solve the problem of D-S evidence theory fusion mistake in the applying process due to the evidence confliction. It indicates by simulation that the fault diagnosis method which includes fuzzy mathematics, D-S evidence theory and fuzzy integral can improve the reliability of the equipment fault diagnosis and can increase accuracy of diagnosis.The paper introduces the way of developing the fault diagnosis system in China, and points out the disadvantages of the way, then puts forward applying the PLC configuration software of the upper PC to do the fault diagnosis system development work for the oxygen-making system, the fault diagnosis algorithm are the fuzzy mathematics, D-S evidential theory and fuzzy integral. It also designs the main heat exchanger fault diagnosis program using the King View. It indicates by simulation that the method is possible.