Development Of LabVIEW-based Nondestructive Testing System Of High Temperature Furnace Tube

High temperature furnace tube is a key component in hydrogen production furnace and cracking furnace in petrochemical enterprises.Its investment accounts for about 25% of the total investment of the enterprise,and fuel consumption accounts for about 70-80% of the total fuel consumption of the whole plant.The service environment of the high-temperature furnace tube is harsh,and it works under high temperature and pressure for a long time.It is easy to suffer from creep,oxidation,thermal fatigue,carburization,corrosion and other damages,resulting in the failure of the furnace tube.Furnace tube damage may cause fire,explosion,toxic gas leakage and other major accidents,in addition to causing huge economic losses,but also may occur personal injury accident.Therefore,the establishment of a reliable safety evaluation system to ensure the safe service of high temperature furnace tube is not only of great economic benefits,but also of great social benefits.In the late 1980 s,Dalian University of Technology first developed the first-generation ultrasonic nondestructive testing system of high temperature furnace tube with independent intellectual property rights in China,which has made outstanding contributions to in-service testing of high temperature furnace tube in China.Around 2015,the second-generation nondestructive testing system of high temperature furnace tube was developed by the institute of nondestructive testing of Dalian University of Technology using virtual instrument technology.The system solves several main problems of the first-generation testing system,such as large volume and weight,difficulty in equipment construction,and difficulty in long-term storage of test data.However,there are still some problems in the second-generation testing system,such as poor portability and poor interface friendliness.At present,NDT technology of high temperature furnace tubes tends to use a combination of several methods to evaluate the creep damage of the tubes and predict the remaining service life.At the same time,virtual instrument technology based on LabVIEW is increasingly applied in the field of NDT.In this paper,based on the hardware infrastructure of the second-generation high temperature furnace tube nondestructive testing system,an update scheme of ultrasonic testing system is proposed,and the interface design and program block diagram compilation of the testing software are carried out using LabVIEW.In addition to reducing the difficulty of software programming and improving the user-friendly interface of detection software,the portability and reliability of detection system are further improved.The new system can realize ultrasonic detection of the internal creep damage of the high-temperature furnace tube wall,continuous detection of tube wall creep,location detection of sampling points,digital storage and invocation of test data,local amplification of test data curve,automatic generation of test report and other functions.