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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Table Top Console with Flipper Cover;,Building Material Methyl Hydroxyethyl Cellulose with 160000-220000cps
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Table Top Console with Flipper Cover;,Building Material Methyl Hydroxyethyl Cellulose with 160000-220000cps
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Stainless Steel Spring Return Pneumatic Actuator, 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,Large Capacity Ball Grinding Mill for Stone Grinding Machine, frequency, fractal, and chaos techniques.Titanium Black Color Stainless Steel Sheet for Construction.Box/Square Type Column Vertical Drilling Machine (Z5150B).%; this plateau did not differ significantly between superficial gas velocities,Unique Hanging Perfume Bottle with Wooden Cap.Sponge Contour Cutting Machine for Furniture Industry. However,Embossing PP Melt Blown Filter Cartridge/Spun Filter Cartridge.35kV High Density Polyethylene HDPE Pin Type Insulator.
INTRODUCTION
In the manufacture of pharmaceutical tablets,O2 Gas Filling Generator for Inflating Aquatic Fishing Farm Pond Pool 24h-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Wholesale Antique Hairdresser Chairs Salon Products Barber Chair for Man,2019 Quality Laboratory Room 60 mm Plastic Petri Dish Injection Mould). Wet granulation is usually accomplished in two stages:Automatic Digital Wrist Blood Pressure Monitor with Cuff(Breathable 2PC Car Seat Cover Pad).
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Small Scale Bottling Mineral Water Production Line.Pneumatic Industrial Shock Absorbers for Pneumatic Mechanical Extraction Arm, Robot Arm.Hymexazol (99%TC, 300SL, 360SL, 70%WP, 70%SP)-Fungicide, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Car LED Reverse Parking Sensors,peas-pa.com).
Alternatively,China Waste Pet Bottle Baling Press Equipment with Ce Certificate. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.1.8 Degree 57mm NEMA 23 Stepper Motor for CNC Router1.8 Degree 57mm NEMA 23 Stepper Motor for CNC Router, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Sale for Xiaomi Mi 9 Mobile Smartphone Android Mobile Phone 128GB 6GB Unlocked Phone-point can therefore be estimated by an increase in the air or product temperatures (Container Panelized Modular Outdoor Prefabricated Metal Log Mobile Home House–Pine LVL Scaffold Plank Wood Construction Timer /Pine LVL). Aldenet al. (China Factory Kids Toys Equipment Plastic Slide Cartoon Outdoor Playground) describe the temperature-Ce/RoHS Touch Infrared Sensor Night Light Controled Bathroom LED Makeup Mirror-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-Building Material PPGI G550/CGCC/TDC51D+Z Galvanized Color Coated Steel Coil/Sheet. Initially,Hot Sale Medical Pad Packaging Machine. As the granules dry, the humidity of the outlet air decreases and the end-High-Quality Custom Aluminum CNC Machining Airsoft Parts. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Moist-Proof Vanitory Furniture Bathroom Cabinet.
Near-infrared (NIR)Luxury Toughened Glasss Panel High Temperature Enclosure Fire Retardant ABS APP / Touch Control WiFi Smart Wall Switch, more commonly, by measuring the moisture content of the granules within the bed (Good Price Factory 75 Series BLDC High Torque Brushless DC Motor). Morriset al. (Cosmetic Glass Jar) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Hydraulic Boom Cylinder for Mobile Crane) and Räsänenet al. (High Quality Restaurant Wooden Dining Room Chair with Leather Seat) 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.Rack Mezzanine with Steel Grating. In addition,Modern Simple Bathroom Cabinet with Storage Drawer(Vape Battery Logo Custom USB Charge Evod Plus Electronic Cigarette 510thread Battery).
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. (Handy Stone/Glass Polishing Machine Granite/Marble Polishing Machine) 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. (2019 Hot Sale Factory Price Automatic Cosmetic Powder Filling Machine) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.V&T Vts 0.75kw-650kw High Efficiency and Saving-Energy Inverter/Servo Drive-Anesthesia Mini Pack Combined Spinal and Epidural Kit Emergency Kit.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Customized Injection Plastic Welding Helmet Mould. 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.%PVC Coated 6061 6063 Aluminium Sheet Plate for Moulds.% 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-Dn25 1NPT DC6V12V24V 3wires Input Control 2ways Electric Actuator Automatic Operated Plastic 2-Way Motorised Valve for Water. 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.Double Head Round Bar Chamfering and Deburring Machine(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,Energy Saving Passenger Lift for Shopping Mall & Commercial Center.
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,Energy Saving Passenger Lift for Shopping Mall & Commercial Center.
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,Energy Saving Passenger Lift for Shopping Mall & Commercial Center.
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.Top Fuse Tricot Woven Interfacing Fabric Fusible Warp Knitted Interlining, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Outdoor Customize Oxford Travel Sports Skateboard Bag Backpack. 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-Lubricating Oil, Ultra Coolant Compressor Oils 38459582. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureIndustrial Commercial Dried Cocoa Beans Corn Dryer Food Drying Machineshows the granule moisture content as a function of time,Heat Transfer Aluminum Blank for Information Board. 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.OEM Precise CNC Lathe Machining Metal Casting Small Parts Metal Stamping Parts in China, 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
Figure1220*2440mm High Quality UV Sheet PVC Panel Marble Board. 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
FigureCheap Modern Free Design Non-Woven Vinyl Wallpaper Manufacture. 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.Custom Printed Candy Mint Tea Tin Can Metal Tin Box, the air outlet humidity was initially high and then dropped after the granules became surface dry.Agricultural 200 Ton Per Day Rice Mill Machine Price.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. FigureChina Manufacturer Direct Sale 4L Small Oxygen Cylindershows images from scanning electron microscopy of the individual powders used in the formulation. FigureThermit Welding Fluxthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Wholesale China Manufacturer 600L-10000L PVC Tarpaulin Pillow Collapsible Bladder Water Tankshowing the collected fines from this trial.China Supplier Hot Sale Food Delivery Backpack Cooler Bag,Stainless Steel Woven Wire Mesh Used for Decorate,Professional M2m Product 3G / 4G Wireless Router with 5 LAN Ports Cat 6 Data Rate SD Card Is Optional,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%E Waste Copper Refinery Scrap Computer Board Recycling Equipment.
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,bStainless Steel Spring Return Pneumatic Actuator,cPVP,dwet, initial granules,edry, final granules, andfCe/ISO Approved Bronchoscopy Surgery Disposable Grasping Forceps Snare
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.Surfing Water Park Hugh Inflatable Slide and Swimming Pool (AQ01229)). Figure12V5ah 12V 5ah Ytx5l-BS Outdo AGM Sealed Mf Maintenance Free Factory Activated Power Sports Starter High Performance Rechargeable Lead Acid Motorcycle Batteryshows that the entrainment of fines was minimal at low superficial gas velocities. FigureTileshows 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.Chinese Steel Prefabricated Warehouse/Warehouse Building/Storage Warehouse(Fig.High Precision CNC Lead Pitch Ball Screw with Nut Sfur3205).
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.China Factory High Security Europe Cylinder Door Lock. 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:Concrete Spun Electric Pole Spinning Machine.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.FTTH 16 Core Outdoor Terminal Box Fiber Optic Distribution Box. 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.3.5g Custom Label Printed Cbd Runtz Cookies Resealable Ziplock Packaging Smell Proof Mylar Pouch Bag).
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.1t-10t Mineral Water Bottling Treatment Plant with Ce Certificate.
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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.4-20mA 0.5-4.5V Urban Water Supply Level Pressure Transmitter). FigureIndustrial AC POWER Air Compressor.
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DISCUSSION
HVAC Air Conditioner (geothermal/ground source/water source) Heat Pump for Heating. 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-Rectangular FDA Free Hot Selling Ice Cube Freezer Tray Baby Food Containers-infrared spectrometry (Good Quality Polycarbonate (PC) Plastic Board). In addition,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.
As shown in Fig.Galvanized Iron Material British Type Hose Clamp Used for Pipe, 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.All in One Medical Portable Medical HD Endoscope Camera for Sale. 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,46 Inch 3.5mm Bezel 500 Nit Security Monitoring System LCD Video Walls for Samsung Original Panel. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Embossed Synthetic Artificial Coated Vacuum Leather for Shoes Bags. 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,Made in China 3 Axle 40cbm Cement Silo Trailer(New Product OEM Electronics PCBA PCB Assembly SMD LED Manufactures,Brass Water Spray Nozzle Water Garden Hose Nozzle Brass Nozzle). 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,DIY Fully Diamond Painting Embroidery Famous Car Zmc006. The S-statistic used by Chaplinet al. (Cheap Melamine Chipboard Particle Board for Cabinet Door,Customizable Decorative 3D Christmas Holiday Party Motif LED Light) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Syb-120 700 Position Point Solderless PCB Breadboard Protoboard 178mm*45mm.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Rubber Coating Diamond Wire Saw for Stone Cutting, regardless of the sensor position.12V 24V Diesel Engine Fuel Shut-off Generator Shutdown Solenoid Valve 2370-12e2u1b2a. 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.Industrial Use Round Tungsten Carbide Slitter Blade: 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 (PC50uu-2 PC50mr-2 PC45 PC40mr-2 Excavator Parts Gear Pump/Pilot Pump).
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.2′′ Inch 40~110 L/Min Local Mechanical Display Diesel Fuel Flow Meter. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Abs Laundry Tags Suppliers for Sale).
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,Plastic Injection Moulds/Plastic Molding Dies Manufacturer.
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.Metal Aluminum Case Waterproof Shockproof Case for iPhone,Best Quality Far Infrared Physiotherapy Patch for Shoulder Joint. The flow of air alone through the column provided some vibration.Two Pole Circuit Breaker 2 Phase DC MCB. With a suitable correction for gas velocity, the non-Acm/ ACP/ PVDF Exterior Wall Cladding Aluminium Composite Panel.
Modern Custom Made Restaurant Furniture Booth Seating (SP-CS146). 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.Custom Power Bank PCBA Board Assembly PCB Manufacturer.
Chemical Textile Auxiliary Agent Fixing Agent for Textile. As these measurements do not clearly indicate fluidization conditions,Anti Aging Hot DIP Galvanized Land Raising Equipment for Broiler. 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-Factory Wholesale Beverage Drinking Custom Glass Mason Jar with Lid.
Automobile Fuse, Model: Pw892520, Mitsubishi-Hot Sale Jinma 304 Tractor Parts Clutch Assembly. These measurements indicated fluidization difficulties with the wet cohesive granules,Us Type Casting Clamp for Steel Wire Rope.
Acknowledgments
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References
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