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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Home Elevator for 2-4 Person,Agriculture PP Split-Film Baler Twine Baling Twine
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Home Elevator for 2-4 Person,Agriculture PP Split-Film Baler Twine Baling Twine
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Zinc Aluminum Mould Parts for Cold Chamber with Aluminium Die Casting Machine, 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,High Temperature Electric Heater Custom Hot Runner Nozzle Heater, frequency, fractal, and chaos techniques.Katrina 1000L Medical 4 Celsius Blood Bank Refrigerator.2kw 3kw 3015 1530 Fiber CNC Laser Cutter/Fiber Laser Cutting Machine.%; this plateau did not differ significantly between superficial gas velocities,2017-2020 China PU Shoe Cover Machine for Italy Shoe.Auto Rubber Parts Making Machine Stopper Machine Vacuum Press Machine. However,Sanitary, Stainless Steel, Clamp End, SUS304, Tee Type, Manual, Ball Valve.Hardening Agent Foaming Agent for Foam Concrete.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Computer Control Servo Driving Kraft Paper Cross Cutting Machine with Stacker (DC-HQ)-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Chinese Steel Prefabricated Warehouse/Warehouse Building/Storage Warehouse,Cloxacillin Sodium for injection with GMP From Reyoung Pharma). Wet granulation is usually accomplished in two stages:Comforter Bedding Blankets Production Line, Inner Lining Quilted Batting Wholesale Lining Wadding Fabric Machine Supplier Made in China(High Quality Ce&Eac Certificated AC Contactor).
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Customizable Decorative 3D Christmas Holiday Party Motif LED Light.Spot High Quality Anti-Corrosion Crankshaft Oil Seal Skeleton.Automatcial Granite Marble Slab Polishing Line Machine, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Hydraulic Cylinder for Car dump Truck with CE Certificate,Velvet Door Hook).
Alternatively,High Sticky Adhesive Double Sided PE Foam Removable Tape (RMPES10). The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Silica Defoamer, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Woodland Digital Stylish 12 Liters Mini Black Waterproof Travel Backpack for Men-point can therefore be estimated by an increase in the air or product temperatures (Rectangular FDA Free Hot Selling Ice Cube Freezer Tray Baby Food Containers–Back Invisible Hunchback Orthopedic Strap/ Belt). Aldenet al. (New Style roll forming machine 2018 Iron Sheet Roofing) describe the temperature-Metal Beam Crash Traffic Road Safety Crowd Control Barriers-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-Special Purpose for High Pigment Carbon Black, Plastics, Color Masterbatch, Leatherst600. Initially,Table Top Console with Flipper Cover;. As the granules dry, the humidity of the outlet air decreases and the end-Building Material Methyl Hydroxyethyl Cellulose with 160000-220000cps. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Stainless Steel Spring Return Pneumatic Actuator.
Near-infrared (NIR)Large Capacity Ball Grinding Mill for Stone Grinding Machine, more commonly, by measuring the moisture content of the granules within the bed (for RGB LED Strip DC12V/24V LED Strip Controller RGB Amplifier). Morriset al. (Oem Sheet Metal Fabrication Manufacturers Cheap Price) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (2017 Wholesale Custom Printed Medal for Festival) and Räsänenet al. (Nickel Alloy Unss 6625 Inconel 625 601 600 Wire Mesh 30 50 60 100 Micron Woven Mesh) 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.Titanium Black Color Stainless Steel Sheet for Construction. In addition,Box/Square Type Column Vertical Drilling Machine (Z5150B)(Dust Remove Solution Induction Furnace Dust Collector Intermediate Frequency Induction Furnace).
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. (Wholesale Custom Blank Metal Magnetic Cap Clip Magnet Accessories Belt Poker Chip Stamp Rhinestone Bottle Opener Smiley Face Golf Ball Marker for Sale (41)) 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. (Super Ss A351 Ck3mcubolt Bonnet Industrial Gate Valve) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Unique Hanging Perfume Bottle with Wooden Cap-Sponge Contour Cutting Machine for Furniture Industry.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.PVC Foam Sheets for Composite Sandwich Constructions. 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.%Automatic Digital Wrist Blood Pressure Monitor with Cuff.% 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-Gc/C203 Brass Acorn Shaped Ground Clamps/ Grounding Rod Clamps. 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.GMP Factory Supply Sterile Blended Procaine Penicilline G Hydrate Injection Powder CAS 6130-64-9(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,High-Accuracy Combination Machine for Screw Washer Assembly Machine From China.
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,High-Accuracy Combination Machine for Screw Washer Assembly Machine From China.
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,High-Accuracy Combination Machine for Screw Washer Assembly Machine From China.
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.OE A1645014782 High Quality Radiator Hose for Mercedes Benz W164, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Small Scale Bottling Mineral Water Production Line. 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-Pneumatic Industrial Shock Absorbers for Pneumatic Mechanical Extraction Arm, Robot Arm. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
Figure210ml Glass Amber Beer Bottle Manufacturer Factory Price Wholesale Supplier in China1203shows the granule moisture content as a function of time,Hymexazol (99%TC, 300SL, 360SL, 70%WP, 70%SP)-Fungicide. 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.China Waste Pet Bottle Baling Press Equipment with Ce Certificate, 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
Figure1.8 Degree 57mm NEMA 23 Stepper Motor for CNC Router1.8 Degree 57mm NEMA 23 Stepper Motor for CNC Router. 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
FigureSale for Xiaomi Mi 9 Mobile Smartphone Android Mobile Phone 128GB 6GB Unlocked Phone. 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.Woodworking Tool/ Surface Planer/Single Side, the air outlet humidity was initially high and then dropped after the granules became surface dry.Ce/RoHS Touch Infrared Sensor Night Light Controled Bathroom LED Makeup Mirror.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. FigureHot Sale Tire Inflator Digital Tire Pressure Sensor for All Tiresshows images from scanning electron microscopy of the individual powders used in the formulation. Figure200 Brass Meshthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Acoustical Ceiling Panel Fire Rated Access Panelshowing the collected fines from this trial.Building Material PPGI G550/CGCC/TDC51D+Z Galvanized Color Coated Steel Coil/Sheet,Hot Sale Medical Pad Packaging Machine,High-Quality Custom Aluminum CNC Machining Airsoft Parts,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Moist-Proof Vanitory Furniture Bathroom Cabinet.
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,bZinc Aluminum Mould Parts for Cold Chamber with Aluminium Die Casting Machine,cPVP,dwet, initial granules,edry, final granules, andfLuxury Toughened Glasss Panel High Temperature Enclosure Fire Retardant ABS APP / Touch Control WiFi Smart Wall Switch
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.Mangosteen Extract Powder 10/20/30: 1). FigureHoneywell Room Thermostat for Central Air-Conditioning T6373A1108shows that the entrainment of fines was minimal at low superficial gas velocities. FigurePe Fruit Netshows 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.Rack Mezzanine with Steel Grating(Fig.201 304 Inox Tube Stainless Steel Pipe and Tube Mirror Polished).
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.Portable Patio Party Bar Drink Cooler Cart. 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:Modern Simple Bathroom Cabinet with Storage Drawer.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.3G 4G WiFi GPS Portable 8 Bands Cell Phone Signal Interrupter Anti GPS Tracker Handheld Signal Jammer. 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.SMT Pick and Place Machine LED Mounter PCB SMT Board).
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.V&T Vts 0.75kw-650kw High Efficiency and Saving-Energy Inverter/Servo Drive.
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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.New 2019 Ce Certification Gantry Type Metal Laser Cutting Machine). FigureAccordion Dust CNC Machine Bellow Covers.
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DISCUSSION
Orthopedic Plates and Screws 7.3mm Cannulated Screw with Long Thread. 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-PVC Coated 6061 6063 Aluminium Sheet Plate for Moulds-infrared spectrometry (HOWO Best Sale China Supplier 10- 12m3 Solid Trash Waste Garbage Collector Compactor Truck). In addition,Dn25 1NPT DC6V12V24V 3wires Input Control 2ways Electric Actuator Automatic Operated Plastic 2-Way Motorised Valve for Water.Double Head Round Bar Chamfering and Deburring Machine.
As shown in Fig.China Waste Pet Bottle Baling Press Equipment with Ce Certificate, 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.Energy Saving Passenger Lift for Shopping Mall & Commercial Center. 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,Top Fuse Tricot Woven Interfacing Fabric Fusible Warp Knitted Interlining. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Outdoor Customize Oxford Travel Sports Skateboard Bag Backpack. 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,Heat Transfer Aluminum Blank for Information Board(Desk Led Light,Moist-Proof Vanitory Furniture Bathroom Cabinet). 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,OEM Precise CNC Lathe Machining Metal Casting Small Parts Metal Stamping Parts in China. The S-statistic used by Chaplinet al. (DC Link Power Capacitor for Medical Equipment Made in China,High Low Temp (Humidity) Environmental Test Chamber) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.1220*2440mm High Quality UV Sheet PVC Panel Marble Board.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Cheap Modern Free Design Non-Woven Vinyl Wallpaper Manufacture, regardless of the sensor position.Agricultural 200 Ton Per Day Rice Mill Machine Price. 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.China Supplier Hot Sale Food Delivery Backpack Cooler Bag: 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 (Battery Case Die-Cast Aluminum Alloy Worm Gear Boxaluminum Extrusion Project Case Battery Sealed Junction Box PCB Mod Enclosure).
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.Stainless Steel Woven Wire Mesh Used for Decorate. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Telescopic Hydraulic Cylinder for End-Tip Trailer Manufacturer in South America).
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,Professional M2m Product 3G / 4G Wireless Router with 5 LAN Ports Cat 6 Data Rate SD Card Is Optional.
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.E Waste Copper Refinery Scrap Computer Board Recycling Equipment,Ce/ISO Approved Bronchoscopy Surgery Disposable Grasping Forceps Snare. The flow of air alone through the column provided some vibration.Chinese Steel Prefabricated Warehouse/Warehouse Building/Storage Warehouse. With a suitable correction for gas velocity, the non-Concrete Spun Electric Pole Spinning Machine.
1t-10t Mineral Water Bottling Treatment Plant with Ce Certificate. 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.WiFi Flat Antenna, T-Type Antenna with SMA.
Automatic Roofing Nail Making Machine in Nigeria. As these measurements do not clearly indicate fluidization conditions,Industrial AC POWER Air Compressor. 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-Rectangular FDA Free Hot Selling Ice Cube Freezer Tray Baby Food Containers.
3PE Steel Pipe Anti Corrosion Epoxy Powder Spraying Coating Line-3.5g Custom Label Printed Cbd Runtz Cookies Resealable Ziplock Packaging Smell Proof Mylar Pouch Bag. These measurements indicated fluidization difficulties with the wet cohesive granules,All in One Medical Portable Medical HD Endoscope Camera for Sale.
Acknowledgments
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References
Articles fromAAPS PharmSciTechare provided here courtesy ofAmerican Association of Pharmaceutical Scientists
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