| Established and operation high temperature liquid lead-bismuth (LBE) loop for4th advanced lead-bisumuth reactor, it provides relation experimental data and experiences on engineering design. It has important value of engineering and scientific. As complexity of LBE facility is increasing, it is to ensuring loop operation reliability and operational integrity becomes an important research topic.The article takes control and fault diagnosis for high temperature liquid LBE loop as the research subject, with digital control, virtualization control, redundant control, fault diagonosis of sensors and actuators detailed study. And many important conclusions and innovative work has been obtained as well. Finally, it provides a strong guarantee for the LBE loop stable operation.To study control system of LBE loop, it consists of four parts.1) Theoretical analysis of LBE loop heat transfer, flow and heating control for high temperature liquid LBE loop, and it provides bases for the design and study of control system.2) Based on the running characteristic of loop and features of PLC and data acquisition card, implementation plan of the main hardware for the digital control system has been designed. The designed control system has the characteristics of control stable, automation level and strong anti-interference. Based on virtualization server, virtual control system for high temperature LBE material experimental loop has been presented, it achieves the network of the system data control, and monitored terminal of virtualized desktop seamlessly switch. And to meet the requirements of flexible control system of LBE loop, the reliability of monitoring system is improved.3) Based on the analysis the reliability of the control system for LBE material experimental loop, the influence of hardware and software redundancy for the system reliability and the mean-time-between-failures is discussed. This article focuses on the PLC CPU and simulates the plan of multi-redudancy system reliability. The redundancy scheme based on a two-CPU with series-parallel is presented.4) On the base of significantly study the control strategy, the characteristics of PID control is analyzed. Integral separate PID control and fuzzy PID control has been combined. And integral separate-fuzzy adaptive PID control is designed. It focuses on the use of PID control for LBE loop heating systems. The feasibility of combination the fuzzy adaptive PID and integral separate PID control scheme through the MATLAB simulation and experiment. The new control scheme of loop operation is provided.On the study of fault diagnosis, it consists of four parts components.1) The fault mechanism of loop operation is analyzed. In the meanwhile, the type and grade of the fault is presented, and three layers of the fault diagnosis system have been presented.2) The methods of fault diagnosis of actuators and sensors have been discussed, and fuzzy rules have been built through statistics data. The fault diagnosis system of electric valves and temperature sensors of experimental section has been simulated by fuzzy logic inference. The simulation results and the practical use results show that the reasonability and accuracy of the fault diagnosis scheme has been validated.3) The fault prognosis method of trend analysis is presented to estimate fault and reduce the faulure of the loop operation.4) Based on web database and virtual instruments technology, the network of fault diagnosis system has been realized. The practical use results show that the status of loop operation is monitored through fault diagnosis system, and the misdiagnosing of the system do not appear. |
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