Research On LOCA Test System Based On Double Parameter Control Of Temperature And Pressure

LOCA accident refers to the loss of coolant caused when a main circuit in the containment is ruptured,resulting in a sharp increase in the pressure and temperature in the containment.After the LOCA accident,nuclear equipment can work in a certain period of time directly affect the development of the whole scene.The LOCA identification test bed simulates the thermal and chemical environment after the accident in the nuclear power plant in LOCA furnace,and verifies whether the nuclear first level equipment can work properly after the accident condition and accident condition.LOCA furnace is an important equipment of nuclear grade equipment identification test.It can check the normal operation of the equipment in the reactor by simulating the thermal environment in the reactor after the LOCA accident.One of the core standards of LOCA identification test stand is the control precision of temperature and pressure in simulation test.Therefore,the temperature and pressure control strategy is essential.The background of this paper is the control system of LOCA furnace in Shanghai city.Firstly,this paper introduces the technological process and the design requirements of LOCA furnace.Secondly this paper established under non steady state test bin inflation process of compressible thermodynamic model,and the model is simplified in Fluent software to test bin filling process numerical simulation using the finite volume method,the software analyzes the water vapor distribution of temperature field in the process of filling,the pressure distribution and their changes with time.At the same time,the paper analyzes the heat transfer characteristics of LOCA furnace,and discusses the feasibility of establishing the system model by using the step response curve fitting method.Then,the nonlinear,timevarying and multi disturbance processes of LOCA furnace temperature and pressure changes are analyzed.According to the characteristics of LOCA identification test control process,this paper combines the internal model control algorithm and fuzzy control strategy,and proposes a fuzzy internal model self-tuning PID control algorithm,and this algorithm in MATLAB in the dynamic and static characteristics and anti-interference characteristics and PID control are compared by simulation.The simulation results show that the proposed algorithm can obtain strong robustness,anti-jamming and satisfactory control quality.According to the requirements of the system process,the temperature control scheme and control circuit are designed for the characteristics and control requirements of the control object.At the same time,the paper uses the LabVIEW software platform,and puts forward the realization scheme of the fuzzy internal model self tuning PID controller in the field of industrial control.Finally,the hardware structure of the control system of LOCA furnace and the working principle of the configuration software of the host computer are described in this paper.The system has the function of automatic test.According to the set of target test curve,the system can complete the automatic control of the test process.The system can monitor the working state of each module of the system in real time,and display it to the user through the software of the host computer,so as to realize the function of data collection,archiving,analysis,processing and so on.At the same time,the system also has the function of system alarm,power failure protection,independent safety prediction and evaluation.