Establishment of distributed temperature measurement and analysis system for tube plate drying machine

In order to solve the problem that the temperature of the tube wall of the tube plate dryer cannot get real-time data feedback during the drying process, which affects the moisture at the exit of the leaf wire drying and the sensory quality of the cigarette, a distributed temperature measurement system was innovatively designed to monitor the key temperature change points of the tube wall in real time and ensure the stability and consistency of the parameters during the drying process. Based on the structure of SH35F tube plate wire drying machine, a simulation model was established. The axial and radial distribution characteristics of the temperature field of the barrel of the wire drying machine and the key points of temperature field changes were calculated by means of fluid control equation and heat control equation. A temperature detection unit consisting of battery module, temperature measurement module and temperature sensor probe was installed at the key points of temperature change of the barrel. To achieve high precision continuous temperature measurement, and then use lora module to form a wireless network for data transmission, each measurement point is configured with a wireless transmission module, so that the real-time monitoring data of each temperature measurement unit can be uniformly transmitted through wireless communication to the supreme computer for data transmission and processing. MySQL database is used to develop the system database for data processing, storage, display and analysis. Finally, taking A brand of cigarettes as the research object, the temperature acquisition system was used to continuously sample the temperature of the dryer cylinder wall during the production process. The results showed that the temperature detection system reached normal operation, and the temperature detection accuracy was less than 0.2 °C. The transmission of measurement data runs stably, the effective working distance of the wireless signal receiver reaches 20 meters without occlusion, and the operating stability of the data processing and analysis evaluation system reaches 100%. The distributed temperature measurement system established in this study provides important technical support for stabilizing the production parameters in the process of silk drying, and lays an important foundation for continuously improving the quality of silk drying and optimizing the production process of tobacco.