In order to ensure the stability of the quality of the tobacco in the loosening and conditioning process and the accuracy of the measuring instruments, verification can be carried out by constructing a mass transfer prediction model and an online verification process. Statistically analyze the input and output of materials in the production process of loosening and conditioning process, and obtain the prediction model of dry matter quality, water matter quality, moisture steam conversion coefficient in tobacco leaves and outlet moisture gas. After production experiment verification, the relative error range between the predicted value of the outlet moisture of the tobacco leaves and the actual measured value is maintained at ±0.48%, and the average relative error is 0.21%, which is less than 0.5%, which meets the requirements of process standards, and the model is accurate and reliable. Based on the material balance forecasting model, the theoretical value is compared with the actual value to realize the online comparison and verification of the moisture meter, which has a certain guiding role in improving the accuracy and verification efficiency of the measuring instrument.
The WF315A drum hot air conditioning cylinder is the main equipment for the process of tobacco silk production. The main problem at present is not stable enough of the outlet moisture content. The large lag and uncertainty of the leaf moisturizing process made it impossible to achieve closed-loop automatic controls of the conditioning cylinder. The methods of energy and material balance were used to analyze heat and water exchange between steam and leaves. And the dynamic prediction models of the opening of the film valve and the water/heat transfer were established. Through actual production verification, the relative error of the dynamic prediction model is within ∓0.17%, which meets the production requirements of ±0.50%. At the same time, two potential industrial applications were proposed, including the prediction of equipment operating status and the establishment of automatic control systems. This work can also provide a theoretical basis of system optimization to achieve energy and material savings.
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