1 / 22

COMPARISON OF DRYING KINETICS OF SPENT GRAIN DRIED ON INERT MATERIAL OF DIFFERENT HEAT CAPACITY

COMPARISON OF DRYING KINETICS OF SPENT GRAIN DRIED ON INERT MATERIAL OF DIFFERENT HEAT CAPACITY.

jacoba
Download Presentation

COMPARISON OF DRYING KINETICS OF SPENT GRAIN DRIED ON INERT MATERIAL OF DIFFERENT HEAT CAPACITY

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. COMPARISON OF DRYING KINETICS OF SPENT GRAIN DRIED ON INERT MATERIAL OF DIFFERENT HEAT CAPACITY Project financially supported by Polish Ministry of High School Education through the program “Supporting International Mobility of Researchers”and The Natural Sciences and Engineering Research Council of Canada (NSERC) M.Zielinska a,bS. Cenkowskib aDepartment of Agro-Food Process Engineering, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland bDepartment of Biosystems Engineering, University of Manitoba, Winnipeg, Canada

  2. PLAN Overview Objective Material Experimental set up Methodology Experimental results

  3. OVERVIEW • Ethanol production • Distiller’s spent grain • Superheated steam drying • Fluidized bed of inert particles • Mathematical modeling of SS drying

  4. OBJECTIVE To determine the effect of different heat capacity of inert particle on the drying characteristics of slurry fraction of grain stillage at a selected range of SS temperatures and velocities

  5. MATERIAL The initial moisture content of DSG fraction was 75.2 ± 0.6 % w.b. Whole stillage (Mohawk Canada Limited, Husky Oil Limited, Minnedosa, MB) Slurry fraction of grain stillage (wheat distiller’s spent grain, wet distillers’ grains, DSG) Fig.1. The wheat whole stillage and slurry fraction of grain stillage

  6. INERT MATERIAL Solid sphere Hollow sphere Size of a teflon spheres: 50.8 mm in diameter Mass of a solid sphere: 149.2g Mass of ahollow sphere: 69.2 g Thickness of the layer of a hollow sphere: 3.5 mm Fig. 2. Three dimensional view of the hollow teflon sphere

  7. SAMPLE PREPARATION The mass of wet DSG used for one experiment 22.0 ± 0.1 g equivalent to a 3 mm layer (1) (2) (3) (5) (4) Fig. 3. The sample preparation for multilayer drying experiments using single inert element

  8. OPERATING PARAMETERS The steam temperature : 110, 130, 160°C The velocity of steam : 0.5, 0.7, 1 m/s Pressure:under or near atmospheric pressure(the max. chamber pressure was 1 kPa above atmospheric pressure)

  9. SUPERHEATED STEAM PROCESSING SYSTEM Drying chamber Data aquisition and control system Steam generator Condensation unit Steam conveying pipes and valves Water tank Superheater Fig. 4. Schematic diagram of the superheated steam processing system

  10. MASS MEASUREMENTS Mass balance Drying chamber (outside) Fan Drying chamber (inside) Fig.5. The superheated steam drying chamber

  11. TEMPERATURE MEASUREMENT

  12. FLOW MEASUREMENT

  13. PRESSURE MEASUREMENT

  14. EXPERIMENTAL RESULTS Steam temperature 160Cvelocity 1 m/s) (3) (4) (2) (1) Fig. 6. Typical changes in moisture content and material temperature during DSG drying on solid sphere in SS

  15. EXPERIMENTAL RESULTS Steam temperature 110, 130, 160C velocity 1 m/s Hollow sphere Solid sphere Fig. 4. Changes in DSG moisture during drying on hollow and solid sphere

  16. EXPERIMENTAL RESULTS Steam temperature 110, 130, 160C velocity 1 m/s Hollow sphere Solid sphere 3.12 kg/kg 3.54 kg/kg 3.38 kg/kg 3.81 kg/kg Fig. 5. The enlarged initial stage of processing DSG in SS

  17. EXPERIMENTAL RESULTS Steam temperature 160C velocity 0.5, 0.7, 1 m/s Fig. 6. Moisture changes in DSG layer dried on hollow teflon sphere

  18. EXPERIMENTAL RESULTS Steam temperature 160C velocity of 1 m/s Fig. 7. A typical material temperature characteristics of DSG dried on hollow and solid inert material in SS

  19. EXPERIMENTAL RESULTS Steam temperature110, 130, 160C velocity 1 m/s Fig. 8. A typical material temperature characteristics of DSG dried on solid inert material in SS

  20. EXPERIMENTAL RESULTS Steam temperature160C velocity 0.5, 0.7, 1 m/s Fig. 9. A typical material temperature characteristics of DSG dried on solid inert material in SS

  21. CONCLUSIONS The constant rate drying period and the falling drying rate period were noticeable for the SS drying of the DSG layer on single inert material Drying on a solid sphere caused the initial moisture content of the sample to increase to the values 10% higher in comparison to the moisture gain on the DSG surface dried on a hollow sphere The increase in SS temperature from 110 to 160C caused the initial moisture gain to decrease by 15% The increase in SS velocity from 0.5 to 1.0 m/s caused the initial moisture gain to decrease by 10-15%

  22. CONCLUSIONS The warm-up period of the DSG was influenced by the different heat capacity of inert material Drying of the DSG on a hollow sphere in comparison to the drying on a solid sphere cut the entire drying time even by 30% The increase in steam velocity from 0.5 m/s to 1.0 m/s resulted in shortening the entire drying time by almost 40%. The material dried on the solid teflon sphere showed a substantial delay on the temperature rate increases in the 2nd rate period in comparison with drying on the hollow sphere.

More Related