Dissertation > Excellent graduate degree dissertation topics show

Research on Drying Mechanism and Control Method of PVA Hydrosol

Author: DengWenLiang
Tutor: HaoXiHai
School: Hunan University
Course: Mechanical Design and Theory
Keywords: far infrared radiation hot airflow drying mechanism thin-layer drying control method
CLC: TQ430.6
Type: Master's thesis
Year: 2009
Downloads: 54
Quote: 0
Read: Download Dissertation

Abstract


Polyvinyl alcohol (PVA) film is known as a popular research direction because of its special excellent characteristics in many aspects, e.g. water solubility and degradability. Thin-layer drying characteristics and different drying technology experiment of PVA water-soluble were researched in this paper, and then improved far infrared radiation and hot airflow control program.In the process of making PVA water-soluble film, drying parameter will influence drying rate and energy cosumption in drying system. The suitable method and technological parameter to dry the PVA water-soluble film by casting on the steel band is studied using the homemade far infrared united with hot airflow drying tester. The thin-layer drying characteristics of PVA water-soluble were determined at different air temperatures and air velocities; multi-linear regression was used to determine the parameter values in thin-layer models. A comparison between experimental and predicated data by PAGE equation for the PVA water-soluble was done. It indicated that the equation of PAGE can reflect PVA water-soluble thin-layer’s discipline very well.Based on the technological parameters (far infrared distant, the initial water content and film thickness) of PVA hydrosol drying are coupled, so the quadratic rotation-orthogonal combination design was adopted to design the experiment. With DPS (data processing system) to deal with the datum which were derived in the experiment, and then the optimized and combined technological parameters achieved through the analysis testing to the integrative index.This paper improved far infrared radiation and hot airflow control system as the old PVA water-soluble dryer is non-automatic, big energy expending etc. In far infrared radiation facet, put forward a complex temperature control scheme that adopt division-control based on the vary demands at each heating moment. In hot airflow aspect, the automatic control system is based on the technology of PID frequency conversion speeding adjustment, PID temperature control and Modbus fieldbus communication protocol. Therefore, the speed of conveyer, the temperature and humidity in the dryer are adjusted. Accordingly the adaptive curve of the drying is formed. The new system will raise the rate of the pass product and reduces the energy consumption.

Related Dissertations

  1. Studies on the Drying Modle and Technology of Tilapia by Heat Pump,TS254.4
  2. Study on the Techniques of Sprout Cultivation with Machine-Transplanted for Double-season Hybrid Rice and Different Methods for Transplanting Late Rice,S511.42
  3. Earned Value Method in Ningbo Construction Group Project Cost Management Application Research,F406.72
  4. The Research on Inventory Control Mode of Steel Room Stock of FAW-VW,F426.471
  5. Drying Mechanism of Tea and Improvement about Dryer Energy-Saving,TS272
  6. Research of Energy-saving Technology on the Port Belt Transmission System,U653.92
  7. Research on Fast Drying Technology of American Ginseng,S567.53
  8. Highway planning method and its application,U412.366
  9. Studies on the Structures of Insect Pest and Natural Enemy Communities in Paddy Fields of Different Rice Types and under Different Insecticide Treatments,S476
  10. Research on 3D Motion Mechanism and Experiments of Biomimetic Flexible Fish Fin Based on SMA,TB17
  11. Modified Compression Field Theory Based 2D Non-linear Finite Element Analysis of Reinforced Concrete,TU375
  12. Study of Moisture Forecasting Model Based on GA-BP Neural Network of Thin-Layer in Drying Process of Alfalfa,S54
  13. Research on Control Method Selection and Time Space Design of Roundabout in City Roads,U491.23
  14. Mathematical Modeling and Simulation in Digital Control of CO2 Gas Shielded Welding Short-circuit Transition,TG446
  15. Studies of Basic Dynamical Properties, Control and Synchronization of a New Hyperchaos,O415.5
  16. Research on the Five-Axis NURBS Spline Curve Interpolation Algorithm and the Acceleration Deceleration Control Method,TG659
  17. Competitive State Factors and Control Method on Athletes of China University Basketball Super League,G841
  18. The Research on Three-phase Switched Reluctance Starter/Generator,TM352
  19. DC-DC switching converter modeling analysis and variable structure control method,TM46
  20. Exploring Dynamics of Time-delay Systems and Complex Networks,O415.5

CLC: > Industrial Technology > Chemical Industry > Adhesive Industry > General issues > Production process and production technology
© 2012 www.DissertationTopic.Net  Mobile