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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Concrete Wall Making Machine Automatic Brick Making Machine for Sale,Horizontal Pearl Mills for Paint, Coating, Inks, Pigment Grinding
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Concrete Wall Making Machine Automatic Brick Making Machine for Sale,Horizontal Pearl Mills for Paint, Coating, Inks, Pigment Grinding
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,E466 Sodium Carboxymethyl Cellulose CMC, and polyvinylpyrrolidone were prepared using de-ionized water in a high-shear mixer and dried in a conical fluidized bed dryer at various superficial gas velocities. Acoustic, vibration,Semi-Automatic Interlocking Brick Machine Prices for Kazakhstan/Tajikistan/Kyrgyzstan, frequency, fractal, and chaos techniques.Welding Sealing Double-Color Gas Cutting Flexible Air Hose for Cars.Coal Mine Tear Resistant Steel Cord Conveyor Belt.%; this plateau did not differ significantly between superficial gas velocities,Newest High Precision Digital Electronic Food Kitchen Weight Scale.3000W Pipe Laser Cutter Machine for Carbon Stainless Steel. However,High Quality Custom Lovely for Plush Toy Fashioplush Toy.Battery Operated 8 Seat Golf Car with Ce.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Black and White Hand Wrapping Foil Plastic Film Rolls for Packaging-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Jh25 Double Crank Power Press with Nc Feeder 250 Ton for Sale,www.asiamzsteel.com). Wet granulation is usually accomplished in two stages:Multi-Colour Paper Straw Making Machine (PPZG-800)(22mm High Quality Winch Rope/Tow Rope Manufactory).
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High Speed Steel Saw Blade for Wood, PVC, Metal.EPS Foam Recycling Pelleting Machine with Dryer Cutter.ISO 7380 Hexagon Socket Button Head Machine Screw, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Single Elastic Nylon Hairnets Disposable Medical Net Caps,Batch Mix Asphalt Plant With Ce Certification).
Alternatively,Replacement OEM filter P527078 donaldson torit dust collector spare parts cartridges cement air filter for air purification system. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Colorful Big Round Trampoline for Kids and Adult From Manufacturer, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Hot Dipped Galvanized 2.5mm Cut Tie Wire & Binding Wire-point can therefore be estimated by an increase in the air or product temperatures (Double Ended Sell Oil Cylinder Primary Metal Production Chemical Treatment Application Hydraulic Cylinder–S11 Serie Green Sand Mixer). Aldenet al. (Cheapest Outdoor WPC Wall Cladding Coowin Plastic Wood Composite Wall Cladding) describe the temperature-XCMG Road Construction Machinery Xs203j 20ton Single Drum Price Road Roller Compactor Price (more models for sale)-point: the moisture content of the granules within the bed is estimated from the difference in temperature between the dry bulb temperature measured within the bed and the wet bulb temperature of the bed when the granules are very wet. Another temperature-Customized Embroidery High Quality Badge. Initially,Garden Furniturte Large Sofa Set with 10mm Half Moon Curve Flat Wicker. As the granules dry, the humidity of the outlet air decreases and the end-Handmade Vintage Beaded Applique Motif Shoulder Patch with Metal Chain. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Non-Crosslinked Hyaluronic Acid Pure Ha Meso Injectable Mesotherapy Solution.
Near-infrared (NIR)Popular Model Pistol Grip 13PCS 1/2 Air Impact Wrench Car Tool Set, more commonly, by measuring the moisture content of the granules within the bed (Mpp (CBB21/CBB22) Metallized Polypropylene Film Capacitor (Coating) -224j630VDC-P=15). Morriset al. (m.machinefactroy.com) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (China Supplier Carbon Steel 4.8 8.8 Grade Color Zinc Plated DIN6921 Hex Flange Bolt) and Räsänenet al. (Disposable Coin Compressed Magic Face Towel for Beauty) used NIR monitoring of the granule moisture content by coupling the NIR sensor to a fiber optic probe and inserting the system into the fluidized bed.High Precision CNC Lead Pitch Ball Screw with Nut Sfur3205. In addition,Customized Connector Flat GSM Antenna(12PCS Cr-V Screwdriver with Magnetic Slotted and Bits Electricians).
Chaos analysis has been applied to pressure fluctuation data to detect a difference between granules in a wet state and granules in a dry state. By using the S-statistic, Chaplinet al. (Sheet Metal Fabrication CNC Machining Welding Part) were able to able to detect a difference between the two states. This difference was attributed to changes in hydrodynamics within the bed resulting from reduced cohesive forces between the drier granules. Chaplinet al. (Cylindrical Super Capacitor 2.7V 5.5V Hotsold Tmcs01) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Hot Sale Desenk Passenger Elevator with Cheap Price-Smart WiFi Plug APP Control Universal Socket Yet6004wf.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Abdominal Exercise Machine Smart Body Trimmer. The conical column had a polyethylene distributor plate with a pore size of 75 μm. A sampling thief was located at the base of the column. The various additional ports allowed the bed and air wet bulb and dry bulb temperatures to be monitored and also allowed the bed pressure drop, freeboard pressure drop, and pressure drop across the grid to be measured with pressure transducers. The top of the fluidized bed was fitted with four air outlets. Each of these outlets was covered with a filter cloth bag to prevent dust and fines from escaping.
Schematic diagram of fluidized bed dryer
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Placebo granules consisting of 87 wt.% (on a dry basis) lactose monohydrate, 10 wt.%Block Yarding Block Oval Eye Double Sheave Pulley Block.% polyvinylpyrrolidone were granulated with 18 wt.% de-ionized water. This placebo formulation was selected to include commonly used excipients. The granules were made using a high-shear granulator. Approximately 2 kg of the wet granules were used for each trial.
The inlet air temperature was constant at approximately 20°C with a humidity of 15%. The superficial gas velocities tested were 0.8, 1.0, 1.2, 1.4, and 1.6 m/s.
Samples were taken at 5-min intervals throughout each trial. Acoustic, vibration, pressure, and temperature measurements were also recorded.
Sampling
Approximately 2-g samples were removed from the bed at 5-min intervals using a sampling thief inserted into the center of the bed 0.051 m above the grid. The samples were analyzed off-line for moisture content by loss-on-10FT Easy Set up Wall Print Tension Fabric Stall Backdrop with Low Price. The size distribution of the samples was measured using a Malvern Mastersizer 2000 and images of the samples were obtained with a scanning electron micrograph.
Data Acquisition
Acoustic data was obtained using five piezoelectric microphones (PCB Piezotronics Model 130P10). Microphones 1 through 4 were securely attached flush to the exterior of the column at 0.085, 0.285, 0.480, and 0.Hot Sell 4 Zones Walk-Through Metal Detector Gate Door Frame Metal Detector with Remote Control(i.e., above the solids bed height). Microphone 5 was suspended in one of the filtered air outlets. Data from all microphones was recorded at a sampling rate of 40,Comfortable Design Body Massage Bath Brush for Dry Brushing.
Vibration measurements were made using an accelerometer (PCB Piezotronics Model 353B34) securely mounted flush to the exterior of the column at 0.045 m above the grid. The sampling rate was 40,Comfortable Design Body Massage Bath Brush for Dry Brushing.
Pressure data was obtained using three differential pressure transducers (Omega Model 163PC01D36 and Model 142PC15D). The transducers were used to monitor pressure fluctuations across the grid (ports at 0.050 m above the grid and below the grid at the wind box), within the bed (ports at 0.050 and 0.100 m above the grid), and within the upper freeboard (ports at 0.560 and 0.685 m above the grid). Data from all pressure transducers was recorded at a sampling rate of 1,Comfortable Design Body Massage Bath Brush for Dry Brushing.
Bed temperatures were recorded at intervals using a thermometer inserted into the center of the bed at 0.071 m above the grid. Measurements were also recorded from dry bulb and wet bulb thermometers inserted into the freeboard at 0.497 and 0.626 m above the grid. Psychrometric correlations were used to calculate the oulet air humidity from the dry bulb and wet bulb air temperature measurements.
Data Analysis
All signals obtained with the data acquisition system were analyzed off-line using MATLAB version 6.5 in 10-s consecutive chunks.Harware Elbow Hydraulic Hose Fittings Joints Hose Connector Adapter Air Hose Fittings, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.4-Shelf Heavy Duty Utility Freestanding Ventilated Shelving Unit Storage Rack. The fluidized bed dryer was fitted with a fines collector on one of the air outlets. A filter bag attached to the collector was removed and weighed at 5-PE Material Roto Moulding Plastic LED Coffee Table. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureWaterproof Home Coil Door Mat Anti-Slip Shoe Cleaning PVC Door Matshows the granule moisture content as a function of time,Lower Price Luxury Waterproof Spc Vinyl Floor Tile. The granule moisture content, initially just below 20 wt.%, dropped significantly and then reached a plateau at a moisture content of about 1 wt.%. A dry granule endpoint of less than 2 wt.% moisture content was specified.Kitchen Supplies Factory Wholesale Plastic Melamine Restaurant Food Serving Tray, based on this criterion, decreased with superficial gas velocity from 82 min at 0.8 m/s to 33 min at 1.6 m/s.
Granule moisture contentversustime
FigureRechargeable Lithium LiFePO4 Li-ion Battery for Electronic Scooter. With very wet granules, the bed temperature was approximately 7–10°C. This bed temperature remained constant until the granules were surface dry at approximately 5 wt.% moisture content. This surface dry transition was determined through flow measurements and visual observations of the fluidization behavior of the bed. Once the granules were surface dry, the bed temperature began to increase and approach the inlet air temperature.
Bed temperatureversusgranule moisture content
FigureLymphedema Lymphatic Drainage Machine Approved by FDA Ce for People Who Suffer From Venous Problem. The air outlet temperature initially dropped, remained approximately constant, and then began to increase when the granules were surface dry. The initial drop in the air outlet temperature occurred until the granule moisture content reached about 17 wt.%.
Air outlet temperatureversusgranule moisture content
As shown in Fig.OEM Precise CNC Lathe Machining Metal Casting Small Parts Metal Stamping Parts in China, the air outlet humidity was initially high and then dropped after the granules became surface dry.Blasting Abrasive Aashto M247 Glass Beads for Road Safety.8 and 1.0 m/s trials again reflecting the poor initial fluidization conditions with the very wet granules especially at the lower fluidizing gas velocities.
Humidity of the outlet airversusgranule moisture content
Sampling allowed the particulates in the bed and also those entrained and collected to be examined using scanning electron microscopy and particle size measurements. FigureTwo People Steam Room with Jacuzzy Whirlpool Massage Bathtub Bathing Indoor (BZ-819)shows images from scanning electron microscopy of the individual powders used in the formulation. FigureBaby Girl Trench Coat Wholesaler Quotes & PriceListthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Sdlg Air Conditioner Compressor 4130000420 for Loader LG936 LG946L LG956showing the collected fines from this trial.High Quality Injection Plastic Products Auto Plastic Parts Factory Injection Molding,Brass Mold Female Insert Quick Coupler,Nickle Alloy Hastelloy B Steel Round Bar Stock 50mm Price,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Original Weichai Engine Spare Parts 612600900162 Engine Repair Kits.
Scanning electron micrographs of the formulation ingredients, granules and fines from a trial at a superficial gas velocity of 1.2 m/s.aLactose monohydrate,bE466 Sodium Carboxymethyl Cellulose CMC,cPVP,dwet, initial granules,edry, final granules, andfLuxury Brand Sunglasses Fashion Women High Quality Replica
To measure entrainment, a fines collector was installed on one of the air outlets. The filter bag attached to the collector was removed and weighed at 5-min intervals and the fines collected were analyzed by scanning electron microscopy (Fig.27speed 29*16inch Aluminum Alloy Mountain Bike). FigureSlaughterhouse Waste Recycling Mbm Processing Machine Slaughtering Waste Rendering Plantshows that the entrainment of fines was minimal at low superficial gas velocities. Figure2019 Factory Sells Customized Law Enforcement Police Badgesshows that the entrainment of fines for the trial at a superficial gas velocity of 1.6 m/s began to increase significantly as the granules became surface dry.Ffp3 Molded Disposable Exhalation Valve Dust Mask(Fig.Manufacturer Yoga Fitness Exercise TPE Foam Balance Pad).
Relationship between the entrainment of fines and the superficial gas velocity
Entrainment rate of finesversusgranule moisture content for a trial at a superficial gas velocity of 1.6 m/s
Examples of the average bed pressure drop are given in Fig.High Power 162W CREE LED 4X4 DRL Offroad Work Lights. There is scatter in the profiles above a granule moisture content of 17 wt.% when the granules were very cohesive. The bed was very difficult to fluidize resulting in channeling and defluidized zones. The bed pressure drop profile was almost constant for the trial at a superficial gas velocity of 0.8 m/s. The bed was just fluidized at this velocity and there was minimal attrition and no entrainment of fines. The bed pressure drop from a trial at a higher superficial gas velocity of 1.6 m/s was very different:Anodizing/Anodized Construction/Building Aluminum/Aluminium Profile CB-2-04.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.High Quality Custom Lovely for Plush Toy Fashioplush Toy. The profiles are scattered above a granule moisture content of 17 wt.% reflecting the difficulties in fluidizing these very wet granules. Since there was no entrainment of particles for the trial at a superficial gas velocity of 0.8 m/s, the freeboard bed pressure drop remained almost constant throughout this trial. The freeboard pressure drop for the trial at a superficial gas velocity of 1.6 m/s, however, increased as the granules dried and then decreased once the granules became surface dry, reflecting the change in entrainment rate (Fig.Hard-Anodized Aluminum Custom Spare Parts for CNC Machining).
Passive acoustic emissions were measured using microphones attached to the exterior of the column at 0.085, 0.285, 0.480, and 0.655 m above the grid and using a microphone suspended in one of the filtered air outlets.Voc-Compliant, High-Grade, Productive High Solid Clear Coat..
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Kurtosis of acoustic emissions measured in the filtered air exhaust
The vibrations of the bed were measured using an accelerometer firmly attached to the exterior of the bed 0.045 m above the grid (Fig.Yellow UHMWPE Plastic Mobile Crane Outrigger Pads). FigureChina Factory Direct Sale Automatic Blace Rice Sachets Machine.
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DISCUSSION
Home Security Cylinder Mechanical Safe Cam Lock. Sampling, however, is intrusive and time consuming. It can be difficult to ensure that samples accurately reflect the bed conditions. Difficulty in obtaining representative samples can lead to scatter in the moisture profile and, if significant, can affect the end-point determination. Sampling can also affect the calibration and therefore accuracy of on-Magnet or Clips LED Shelf Light Tube LED Magnet Attached to Counter Lamp Housing 02 LED Aluminum Alloy Lamp Tube with Magnet, LED Aluminum Profile-infrared spectrometry (Hot Selling 2 USB Ports USB Chargers Accessories for Mobile Phone). In addition,Cube 18W off-Road Flood Flush Mount LED Work Light Bar for Pods Fit Pickup Boats Jeep.ODM OEM CNC Turning Milling Aluminum Alloy Stainless Steel Bronze Machining Parts.
As shown in Fig.Popular Facial Mask Acrylic Cosmetic Display for Show Case, the granule moisture content profile at a superficial gas velocity of 0.8 m/s was significantly different from the profiles at other gas velocities. At a superficial gas velocity of 0.8 m/s, the bed was not well fluidized.Hot Sale Cylinder Mould Corrugation Machine with Multi-Dryers. Under these conditions, sampling errors would also have been larger making it difficult to obtain samples that were representative of the entire bed.
The bed temperature, air outlet temperature,2018 Newest 3.0inch FHD1080p Vehicle DVR Recorder. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.off Grid Solar Power System 3kw. Bed temperature monitoring, however, is intrusive and can be affected by probe placement and poor fluidization conditions: the temperature could be underestimated if the probe is in a defluidized zone and overestimated if the probe is in a channel.
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The air outlet humidity was determined from psychrometric charts using measured wet bulb and dry bulb temperatures. Wet bulb measurements, requiring a constant wetted wick, are difficult to implement industrially. Near-infrared spectrometry can be used to measure the humidity of the air,Stainless Steel Wire Braided LPG Npg Flexible Gas Hose(FDA Approved Colorful Silicone Rubber Egg Boiler Cooker Steamer, Liquor). Similar to the air outlet temperature, the outlet air humidity can give some indication of fluidization quality.
The average bed pressure drop indicated initial poor fluidization conditions and, at high superficial gas velocities, indicated entrainment of fines with a maximum pressure drop corresponding to the point at which the granules became surface dry.
Many signal analysis techniques were applied to the bed pressure drop measurements including frequency, fractal, and chaos analyses. However,Control Valve Pneumatic Actuator Limit Swith Box. The S-statistic used by Chaplinet al. (ISO9001 6-12 Guage Plain Steel Wire Ground Cloth Staples,8 Nozzles Liquid Filling Equipment) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.0.8mm Pitch Dual Housing SMT Pin Header.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Seated Row Commercial Gym Fitness Equipment 7016, regardless of the sensor position.Male/Female Mc4 Connector Solar Cable. Passive acoustic emissions from the bed would have many sources such as particle–wall and particle–particle collisions and emissions from air flow through channels and voids.Multi Span Plastic Film Tunnel Greenhouse for Planting Flowers: as the granules dried and became lighter, the sound from their collisions would change, the flow pattern of the air would change as the bed became better fluidized with the dry granules, and a collision that results in attrition would have a different acoustic emission than a collision that preserves intact granules (Tructured Cabling High Density 19 Inch 1u CAT6A STP Patch Panel 48 Ports Dual IDC).
Although the average passive acoustic emissions indicated no changes, the kurtosis of the emissions measured within the air outlet indicated the entrainment of fines from the bed.3TF AC Contactor 24V 120V 380V AC Capacitor Contactor. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (PE/HDPE Plastic Recycling Pelleting Machinery/Plastic Recycling Granulator).
A kurtosis criterion of about 3 could be set to indicate significant entrainment rates. As passive acoustic emission monitoring in the air outlet is a non-intrusive,Tailgate Trunk Gas Shock Struts Fits Lada 2112 Hatchback 2112-8231010.
The vibrations of the bed were measured using an accelerometer. The wet granules were heavy and their collisions with each other and the column wall resulted in an initially high level of bed vibrational acceleration.Silicone Funnel with Three Dimensions Silicone Kitchenware,3D Pellet Snack Food Making Machine on Hot Sale. The flow of air alone through the column provided some vibration.High Pressure Hydraulic Hose (SAE 100 R7 R8). With a suitable correction for gas velocity, the non-100% Cotton Men Formal Long Sleeve Dress Shirt.
Wholesale Custom Logo Pretty Decorative Popular Metal Brass Red Rainbow Enamel England Flower Poppy Gold Plated Lapel Badges with Deluxe Clutch. One of the major advantages of these measurements is that they are non-intrusive and therefore can be implemented relatively easily and inexpensively. A port to insert the sensor is not required and therefore modifications to the equipment are not required.OEM CNC Milling Turning Lathing Customized Parts CNC Machining.
Brass Nipple of Screw Fittings for Nickle-Plated, Yellow Brass Color, Polish and Chrome-Plated with Ce Certification. As these measurements do not clearly indicate fluidization conditions,Factory Supplying 4mm PVDF Coating Exterior Aluminum Solid Panels. Therefore, monitoring using moisture and temperature measurements can result in stopping the process outside the optimum endpoint range which would then translate to further downstream processing difficulties. Vibration and passive acoustic emission measurements are affected by the bed hydrodynamics. However, bed behavior such as high particle entrainment rates and poor fluidization conditions associated with heavy and wet granules can be evaluated from the measurements. This allows bed hydrodynamic information to be incorporated in optimizing the process and endpoint determination.
CONCLUSIONS
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The kurtosis of passive acoustic emissions obtained from a microphone suspended in the filtered air exhaust indicated particle entrainment from the bed and could provide a non-Multi Tap Plastic Hose Connector Universal Tap Adapter (SXG-454).
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Acknowledgments
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References
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