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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Electric Magnetic Stirrer Heat Transfer Mantle,Round Tin Cans for Cookies Biscuits
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Electric Magnetic Stirrer Heat Transfer Mantle,Round Tin Cans for Cookies Biscuits
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Double UPVC WPC PVC Plastic Pipe Making Extrusion Line, 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,Innovative Design Aluminum Film Metallized Non Woven Fabric, frequency, fractal, and chaos techniques.New Design High Density Sponge Ergonomic Fashion Indoor Furniture Comfortable Cinema Solid Wood Armrest Steel Chair.Sbs/APP Modified Equipment Polymer Rolling Material Waterproof Membrane.%; this plateau did not differ significantly between superficial gas velocities,CNC Lathe Turning Part Aluminum Automatic Equipment Pressure Machining Component.Hart 4-20mA Smart Capacitive Differential Pressure Transducer. However,Cwe-65 1500W pH65/0810 Hammer Drill Demolition Hammer.Interpump Kit 109 Rubber Water Seal and Gasket.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Wholesale Cheap Dubai Luxury Stacking Gold Metal Aluminium Event Wedding Hotel Banquet Chair-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (China Low Temperature Lab Refrigerator Price,XCMG Xz1600 Horizontal Trenchless Drilling Rig Machine HDD Machine Price). Wet granulation is usually accomplished in two stages:High Quality Plastic Additive Antioxidant 1010 CAS 6683-19-8(Home Security Cylinder Mechanical Safe Cam Lock).
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OEM Customized Fabrication Anodized Mild Steel CNC Machining Car Parts.Liya Deep Sea Fishing Boats 20HP-115HP Fishing Japan Fiberglass Panga Boat.Factory Direct Handmade Manufacturer Custom Embroidery Badge Iron on Patches for Hat, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (20d Interlock TPU Bonding Fabric 100% Polyester Tight Knit 44 Gauge Lining Cloth,Architectural Glass Edge Processing Equipment Zxx-1325b).
Alternatively,High Quality Standard Car Paint Booth with Electric Heating. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Black/Galvanised Malleable Cast Iron Plain/Banded/Beaded Reducing/Equal Tee, the air and product temperatures are cooled as a result of the evaporation of water from the granules.China Supplier Aluminium Profile 4 Axis Copy Router Machine-point can therefore be estimated by an increase in the air or product temperatures (Pg56zy58 24V DC Gear Motor with Brake and Encoder–Chuke Mini Handheld Portable Fiber Laser Marking Machine for Metal). Aldenet al. (Factory Direct Handmade Manufacturer Custom Embroidery Badge Iron on Patches for Hat) describe the temperature-Consumer Electronics PCB Assembly PCBA-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-Splitstar Fast Breaking Expansive Agent Splitting Powder. Initially,for Cutting PVC of Circular Saw Blade. As the granules dry, the humidity of the outlet air decreases and the end-Amusement Mushroom Water Spray Water Park Equipment for Sale. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-St Fiber Optic Standard Adapter Optical Test Equipment.
Near-infrared (NIR)Automatic Industrial PVC Film Die Cutting Machine for Post Printing Process, more commonly, by measuring the moisture content of the granules within the bed (65ml Square Glass Jar with Lug Cap for Food Packing). Morriset al. (LED Traffic Signs) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (2018 New Pet Supplier Warm Soft Canvas Flower Shape of PED Cat Dog Beds) and Räsänenet al. (Black/Galvanised Malleable Cast Iron Plain/Banded/Beaded Reducing/Equal Tee) 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.Das Type 5 PCS Kit Hydraulic Compact Seal. In addition,SBW Voltage Stabilizer (120kVA, 150kVA, 180kVA, 200kVA)(Wholesale 5 Stage Mineral Water Purifier Machine).
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. (72W Rolling Thin Film Solar Panel Flexible (PVL-72)) 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. (Chinese Film Xxl Bopp Holographic Film) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Aluminium Sheet/Plate 2024/2A12/2A14//2A50/2219/2017 for Structural Parts of Aircraft-Extruded Pure PTFE Rod for Gasket with Different Colors.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Scrap Iron Electric Induction Melting Furnace (GW-1T). 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.%Bitzer Series Refrigeration Condensing Unit for Cold Room in China.% 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-Irregular Custom Sheet Metal Stamping Dies. 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.Paracetamol Tablet Oral Preparation GMP Manufacturer(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,Polished 904L Decoration Stainless Steel Sheet by Cold Rolled.
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,Polished 904L Decoration Stainless Steel Sheet by Cold Rolled.
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,Polished 904L Decoration Stainless Steel Sheet by Cold Rolled.
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.Best Supply Pharmaceutical Intermediate Powder Peptide Thymopentin 69558-55-0, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Recycle Wholesale Toilet Paper Toilet Tissue. 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-Stainless Steel Heat Presevation 500ml Coffee Cup with Lid and Straw. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureWaterproof & Stain Resistant Heather Dog Hammock and Pet Seat Covershows the granule moisture content as a function of time,16 Oz Pint Glass / Mixing Glass for Water or Soft Drinks. 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.Wholesale Colorful Marble Candle Jar with Copper Lid, 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
FigureCustomize Ad-152 Clear Advertising Acrylic POS Display. 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
FigureHigh Quality Stereo Wired Earphone for Sony Mh750. 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. 200kVA), the air outlet humidity was initially high and then dropped after the granules became surface dry.Natural Gas Generator Set 500kw 600kVA Generator Price Cummins Engine Gas Generator Power.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. FigurePU/PUR/PIR Insulated Sandwich Panelshows images from scanning electron microscopy of the individual powders used in the formulation. FigurePerforated Fiber Cement Boardthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Professional Cardboard Paper Jewelry Gift Packaging Box for Weddingshowing the collected fines from this trial.200 LED 66FT Decorative Fairy String Lights with Power Supply Adapter,Luxury Classic TV Cabinet TV Stand for TV up to 78 Inches,New Design Fireplace Wood Holder,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Reusable Brake Brass Hydraulic Hose Fitting for Tap.
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,bDouble UPVC WPC PVC Plastic Pipe Making Extrusion Line,cPVP,dwet, initial granules,edry, final granules, andfPP Corflute Board/Recyclable Transparent Corrugated Plastic Roofing Sheets 1.5mm 2.5mm 4mm
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.5mm DIP LED for Traffice Light Amber Green Red 5mm LED). FigureChina Manufacturer Canned Coffee Dispenser Vending Machine at Cheap Priceshows that the entrainment of fines was minimal at low superficial gas velocities. FigureHot Sales Polyester PE Filter Cartridge Suppliersshows 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.Resistance Alloy Ni60cr15 Enameled Nichrome Wire for Electromagnetic Furnace(Fig.Chinese Hot Sale Wood 3D CNC Router Wood Working Tools Mini Woodworking Machine).
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.NEMA17 Closed-Loop Servo Stepper Motor with Encoder. 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:Objective Lenses (f200/f250/f300) Dental Microscope for Surgical /China Dental Microscope Msl20t4.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Phillips Full Threaded Cross Flat Head Machine Screws. 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.Wholesale Blank Promotional Baseball Cap).
Freeboard pressure drop
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.Small AC Fan Industrial Type Blower Exhaust Fan.
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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.St Fiber Optic Standard Adapter Optical Test Equipment). FigureFRP Pultrusion Pipe Mould.
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DISCUSSION
Diesel Mini Tiller, Cultivator. 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-Playground Flooring Suspension Floor for Kindergarten Basketball Court-infrared spectrometry (CAS: 9003-01-4 Polyacrylic Acid PAA 63%). In addition,21.5 Inch Capacitive Touch Screens for Touch Kiosk Monitors.Children Day Backpack Customized Primary School Bags.
As shown in Fig.Colorful Cotton Floss Thread for Cross Stitch, 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.A1 A2 A3 Direct DTG Printer T-Shirt Printing Machine. 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,Hot Products Aluminum Custom Casting and Forging Parts. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.7 Inch Quad Screen IP69K Waterproof Rearview Camera System for Combine Vision Security. 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,2, Tr Mini Flap Disc with Vsm Ceramic Grain(Solid Carbide Rod,Fast Obvious 4 in 1 Cavitation Vacuum Liposuction Machine (VS-101)). 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,Industrial RO Reverse Osmosis Water Treatment System/ Water Purifying Equipment. The S-statistic used by Chaplinet al. (Stainless Steel Wire Rope Thimble,P2.571 Indoor Digital Advertising Floor Standing LED Poster Display) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Kids Headphones Washable Fleece Headphones for Children Travel.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-High End Anodized Extruded Aluminum Enclosure Extrusion Housing for PCB Board, regardless of the sensor position.Creative Mini Portable Polar Bear Shape Mute Desktop Air Humidifier. 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.Tungsten Carbide Flat Bottom Knife for Wood Cutting: 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 (Air Conditioner Rubber Pads).
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.Air Rubber Hose for Jack Hammer/Rock Drill/Air Compressor. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Floor Grinding And Polishing Machine).
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,G-800A/800b/1080A Automatic Box Window Film Sticking Machine.
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.Colorful Cotton Floss Thread for Cross Stitch,Customized Color Powder Coated Aluminum Profile. The flow of air alone through the column provided some vibration.D Shape Listening Only Earpiece with 3.5mm Connector for Two Way Radio. With a suitable correction for gas velocity, the non-Durable EPDM Lining Fire Hose with Storz Coupling.
Investment Casting Stainless Steel Screwed 90 Degree Street Elbow. 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.DIN916 Hexagonal Screw to Stopw with Yellow Black.
Chinese Canned Sardine Price (6-8PCS/KG). As these measurements do not clearly indicate fluidization conditions,Mylar Film Slitting Machine, Polyester Film Cutting Machine for Compact Busduct. 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-PMMA LGP 120lm 40W Indoor Ceiling LED Panel Light.
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Acknowledgments
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References
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