Development Of Material Thermal Sensitivity Of Measurement And Control System

Dangerous chemicals bring the convenience for human production, at thesame time, also have taken a potential threat or actual harm to public safety becauseof their inherent hazardous characteristics at various stages in the life cycle of theproduction, transportation, operation, usage, treatment and so on, especially areparticularly prominent in the thermal effect of highly closed conditions. The existingmaterial thermal sensitivity detection is mainly based on the “Recommendations onthe Transport of Dangerous Goods Manual of Tests and Criteria”, domestic andforeign testing equipments have shortcomings as follow: poor securit, low degree ofaccuracy and automation, international standards in line with the low, it is difficult toprovide effective support for the efficient development of China’s chemical industryand the import and export of chemicals to deal with technical barriers to trade.The topic pointed at material thermal sensitivity detection accuracy, safety andautomation requirements, targeted with the material thermal sensitivity measurementand control system based on the development of advanced, automation and network,researched the reaction vessel preparation, heating rate control, sensor temperaturedrift compensation algorithm and the other key technology, achieved the materialthermal and automated accurate assessment, promoted science and technologicalprogress of the chemicals testing. The contents of the study were summarized asfollows:The topic analyzed the material thermal sensitivity mechanism, proposed thefactors that affect the detection precision of material thermal sensitivity; analyzed thematerial thermal sensitivity detection process and control system functionalrequirements, combined with the shortcomings of the existing equipment in domesticand abroad, the system was designed focusing on the constant sample preparationand testing reaction unit.The topic aimed at the constant pressure sampling precision, used the finiteelement to analyze the mechanical properties of the sample preparation mechanismand optimize the mechanical design, used the least squares with Lagrange interpolation method to compensate the sensor temperature drift error. According tothe test platform’s constant heating rate, the topic achieved automatic control of theconstant heating rate and correction through the double closed loop control andconstant temperature PID algorithm control.Thermal sensitivity measurement and control system used the standard testmaterial to verify reliability and accuracy, evaluated and analyzed system samplingprecision, the heating rate control precision and the detection results.Experimental results show that: the system can be compatible with high thermalsensitivity test of solid and liquid material, the constant pressure sampling accuracyis0.1N, the heating rate control accuracy is0.2K/s, the automation device greatlyimproves the detection efficiency and safety performance, which meets standarddemand.