Dissertation > Excellent graduate degree dissertation topics show

A Study on Operation Parameters and Decreasing Energy Consumption during Vacuum Freeze Drying

Author: YaoZhiHua
Tutor: GuoYuMing
School: Shanxi Agricultural University
Course: Agricultural Mechanization Engineering
Keywords: Vacuum freeze-drying Process parameters Energy-saving Crafts Optimization
CLC: TB66
Type: Master's thesis
Year: 2003
Downloads: 476
Quote: 5
Read: Download Dissertation

Abstract


Vacuum freeze-drying technology has been widely used in many fields , and the technology used in food processing to obtain high - quality dehydrated food . Shanxi Province has several food lyophilized enterprises , these enterprises are generally faced with high energy consumption equipment and technical problems in the production cycle is too long . To this end , the Shanxi Province Science and Technology Commission, the project as a provincial scientific and technological projects . Firstly, on the basis of the vacuum freeze-drying technology development status overview , expounded the necessity and importance of the to reduce vacuum freeze-drying energy consumption and shorten the drying time . The physical model under the test conditions , the appropriate assumptions on the basis of the establishment of the non - steady - state mathematical model of the vacuum lyophilized . Model simplifies prevail in the steady-state model was solved analytically . The results showed that the porous dried layer temperature changes exponentially magnitude of change depends on the water vapor flow rate , temperature of the frozen layer linear distribution , predicted the freeze-drying time and the actual results . Affect the vacuum freeze-drying process parameters were studied . Tests showed that : The lyophilized thickness, the degree of vacuum of the heating plate temperature, the system is the most important of the three process parameters ; freezing rate on the total drying time is not affected , the the sublimation drying time of the slow freezing material than fast frozen material is short , but slow frozen parse relatively long time, the small difference between the two , the total lyophilization time ; initial freezing temperature of the lyophilization process can be ignored . The the hybrid heating time of the freeze-dried to be significantly less than the the pure radiant heating ; cold trap temperature was set at -40 ℃ -45 ℃ more reasonable . The tests also found that, the larger moisture content of the material should not be used to thermally conductive quick freeze . Dimensionality reduction on the basis of the analysis of the test results of the three factors quadratic orthogonal regression analysis method to explore the impact of the freeze-dried thickness , the temperature of the heating plate and vacuum drying time and drying energy consumption , and mixed heating conditions the next unit water energy consumption and lyophilized productivity optimization analysis . The better the process parameters validation results show that the optimization results in line with the actual situation . Variation of the vacuum freeze- drying process energy consumption composition and process of the current pilot study . Reasonable operation can achieve the purpose of energy conservation on the basis of the analysis of the results found for compressors and vacuum pumps .

Related Dissertations

  1. Development of the Platform for Compressor Optimization Design and Aerodynamic Optimization Design in the Transonic Compressor,TH45
  2. Investigation of Turbine S2 Stream Surface Direct Problem Aerodynamic Optimization Design,V235.11
  3. Several Problems of Energy Saving Operation in Air Conditioning System of Large Scale Public Buildings,TU831.6
  4. Reseach on Optimal Control of Elevator Group Based upon Ant Colony Algorithm,TU857
  5. Research on High Efficiency Interior Permanent Magnet Synchronous Motor,TM341
  6. Application of Interior-Point Theory for Reactive Power Optimization in Large Power Systems,TM714.3
  7. The Basic Research of Axial Flux Inductor Type High Temperature Superconducting Motor,TM37
  8. The Optimization of AVS Video Decoder on the PC Platform and Improvement of Field Decoding,TN919.81
  9. Research on Stability of Hierarchical Sattellite Network,TN927.23
  10. Query Processing and Optimization in Massive Multi-Database Integration,TP311.13
  11. Research on Feature Extraction and Classification of Tongue Shape and Tooth-Marked Tongue in TCM Tongue Diagnosis,TP391.41
  12. Studies on Fermentation Optimization, Purification and Enzyme Characteristics of Lipase from Aspergillus Oryzae FS-1,TQ925.6
  13. Large the Hongshan iron ore mine personnel tracking positioning system optimization study,TN929.5
  14. Computing Minimum Distance between Curves/Surfaces Based on PSO Algorithm,O182
  15. Analysis of Nutritional Compositions and Quality of Shishen (Eremurus Chinensis Fedtsch.),S647
  16. Research on University’s Energy Saving System Facing the Construction of Green University,G647
  17. 1 - deoxynojirimycin synthetic route design and process optimization,TQ463.5
  18. Optimization of Fermentation Conditions, Purification, Cloning and Expression of a Cold-active Lipase from Pseudomonas Sp.RT-1,TQ925
  19. Breeding of Fungal α-amylase High-producing Strain by Genome Shuffling,TQ925
  20. Hot air drying characteristics of lettuce osmotic dehydration mass transfer kinetics and permeability,TS255.52
  21. Study on Application of Red Yeast Rice in Fermented Sausage,TS251.65

CLC: > Industrial Technology > General industrial technology > Refrigeration Engineering > Refrigeration technology
© 2012 www.DissertationTopic.Net  Mobile