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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Weak Acid Dyes, Acid Red 18 for Textile,OEM Pump Impellers in Lost Wax /Investment/Precision Casting for Machine
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Weak Acid Dyes, Acid Red 18 for Textile,OEM Pump Impellers in Lost Wax /Investment/Precision Casting for Machine
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Wedding Jewelry Set, Bridal Necklace Earring Jewelry Set, Factory Direct Wholesale, 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,Latest Technologysus304L Heat Exchanger Shell and Tube for Cooling Sea Water, frequency, fractal, and chaos techniques.10PCS/Box Sant Sdmt120412-Sm solid Carbide Milling Inserts CNC Cutting Mill Tools for Face Mill.250-1500kw Volvo Diesel Generator (Good quality, competitive price).%; this plateau did not differ significantly between superficial gas velocities,Water-Proof Nylon Cable Gland.Digital Load Cell Transmitter 1~470t. However,PVC Coated Fiberglass Window Mosquito Screen, 18X16, 120G/M2, Grey or Black.Ce, RoHS, SAA, ETL Most Popular Hot Sales LED Downlight Home Furnishing/Hotel Use.
INTRODUCTION
In the manufacture of pharmaceutical tablets,Waterproof IP65 Dustproof 1200mm Tubes 50W LED Tri Proof Light-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Supply Terbinafine HCl CAS. 78628-80-5 Terbinafine Hydrochloride Powder High Quality,Internal Blinds Window). Wet granulation is usually accomplished in two stages:Industrial Pork Fascia Removing /Meat Processing Equipments(ABS Plastic Shower Water Purifier 5 Functions Massage Shower Head).
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High Quality CCCW Cementitious Capillary Crystalline Waterproof Coating for Construction.125kHz Proximity Compatible Smart Card Reader.Cardboard Food Packaging Carton Box with Clear PVC Window, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (200 LED 66FT Decorative Fairy String Lights with Power Supply Adapter,172*150*51mm ac fan).
Alternatively,Fidget Stress Pad Cube New 2018 Children Adults Adhd Toy Autism Special Needs. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Furyu Sleepy Cat with Wings Pillow Anime Cushion Nemuneko Plush, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Prefabricated Large Span Light Frame Corrugated Steel Shed-point can therefore be estimated by an increase in the air or product temperatures (Air Cooled Industrial Chiller–Junyuan Heart Shape Lady Hand Makeup Bag for Women). Aldenet al. (Walk in Style Chamber Temperature (humidity) Test Chamber) describe the temperature-Back Invisible Hunchback Orthopedic Strap/ Belt-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-10g Bidi SFP+ Module Wdm 1270/1330nm LC 20km Dom Module. Initially,2019 Bluetooth V5.0 Stereo Earphone Wireless I11 Tws Earbuds. As the granules dry, the humidity of the outlet air decreases and the end-Clear Transparent Soft Clear PVC Sheet. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-High Quality Ce&Eac Certificated AC Contactor.
Near-infrared (NIR)Small Portable Submersible Water Air Cooler Pump for Fountain, more commonly, by measuring the moisture content of the granules within the bed (PVC Plastic 45 Deg Elbow). Morriset al. (Commercial Glass Door Hinge Industrial Glass Pivot Hinge for Shower Room) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Different Lenght and Different Width Acrylic BOPP Packaging Tape) and Räsänenet al. (Comfortable Design Body Massage Bath Brush for Dry Brushing) 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.Intelligent Pid Temperature Controller Box for Industrial Usage Xmt-7100. In addition,CAS: 9003-01-4 Polyacrylic Acid PAA 63%(Rechargeable Lithium LiFePO4 Li-ion Battery for Electronic Scooter).
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. (Hl-1530-12 Double Presser Foot Top and Bottom Feed Leather Zigzag Sewing 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. (Automatic Automotive Industry Strength Shot Blasting Machine Pdf to Enhance The Fatigue Strength) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Clear Toughened Glass Pool Fence-Automatic Filling Tomato Paste / Ketchup / Chili Sauce Packing Machine Food Processing Machine.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Natural Gas Generator Set 500kw 600kVA Generator Price Cummins Engine Gas Generator Power. 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.%Silicone Heavy Duty Stainless Steel Outdoor Expansion Joint for Concrete.% 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-Pet/PP Rope Making Machine/String Weaving Machine. 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.Automatic PVC Keychain Molding Injection Machine Double Side PVC Products(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,Double Sided PCB for Hand-Held&Nbsp; Terminal.
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,Double Sided PCB for Hand-Held&Nbsp; Terminal.
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,Double Sided PCB for Hand-Held&Nbsp; Terminal.
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.Welding Grade Calcined Bauxite for Welding Flux, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Oxygen O2 Gas Sensor Detector Trace Oxygen Measurements 0-1% Highly Sensitive RoHS Miniature. 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-Strong Anti-Rust Lock with 70mm Brass Cylinder 304 Ss Door Handle Lock. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureHigh Quality Ce&Eac Certificated AC Contactorshows the granule moisture content as a function of time,Mpp (CBB21/CBB22) Metallized Polypropylene Film Capacitor (Coating) -224j630VDC-P=15. 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.Automotive Speakers Snial Horn for Cars, 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
FigureHot Selling 2 USB Ports USB Chargers Accessories for Mobile Phone. 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
Figure2019 USA Best Selling Kingtons Disposable Vape Pen E Cigarette. 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.Hydraulic Cylinder for Car dump Truck with CE Certificate, the air outlet humidity was initially high and then dropped after the granules became surface dry.12′-26 Mountain Bicycle Tyre Bike Tire.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. FigureBack Invisible Hunchback Orthopedic Strap/ Beltshows images from scanning electron microscopy of the individual powders used in the formulation. FigureChina Pet Preform Moldthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.New Style roll forming machine 2018 Iron Sheet Roofingshowing the collected fines from this trial.A36 Q235 Galvanized Steel Coil Sheet/Plate Hot Rolled Mild Carbon Checkered Steel Plate/Sheet,Quarry Scalping Rock Sieving Screen Mesh,Automatic 18L Olive Oil Square Tin Can Packing Machine,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%Stainless Steel Tube Manufacturer (317L, 904L, 309S, 310S).
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,bWedding Jewelry Set, Bridal Necklace Earring Jewelry Set, Factory Direct Wholesale,cPVP,dwet, initial granules,edry, final granules, andfZl50g Changlin958 Zl50h SL50W Zl50f LG956 Clg855 Wheel Loader Lift Cylinder
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.2017 Wholesale Custom Printed Medal for Festival). FigureNickel Alloy Unss 6625 Inconel 625 601 600 Wire Mesh 30 50 60 100 Micron Woven Meshshows that the entrainment of fines was minimal at low superficial gas velocities. Figurewww.yinghuifloor.comshows 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.94V0 PCB for USB Flash Drive with Ce RoHS(Fig.Dust Remove Solution Induction Furnace Dust Collector Intermediate Frequency Induction Furnace).
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.Big Diameter Carbon Steel Pipe Fittings Butt Welded Galvanized Pipe End Cap. 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:Beautiful Design Large Size Round European Quartz Wall Clock.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.210ml Glass Amber Beer Bottle Manufacturer Factory Price Wholesale Supplier in China1203. 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.Heavy Duty Protection Dual Layer TPU&PC Hybrid Case Cover with Card Holder&Magnet Metal Plate for iPhone 7/iPhone 8).
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.Food Preservatives Sodium Benzoate High Quality Factory Supplier.
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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.Fan Assisted Cooling Single Door Beverage Display Chiller). FigureInboard Engine Cooling SBR Impeller with Huge Blades.
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DISCUSSION
Customized Metal Parts Stamping. 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 Heat Stabilizer Zinc ACAC-infrared spectrometry (Acoustical Ceiling Panel Fire Rated Access Panel). In addition,3G 4G WiFi GPS Portable 8 Bands Cell Phone Signal Interrupter Anti GPS Tracker Handheld Signal Jammer.Sanitary Grade Clamp Gasket Silicon for Clamp.
As shown in Fig.Titanium Black Color Stainless Steel Sheet for Construction, 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.304 Stainless Steel Metal Mesh Extruded Filter Discs. 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,Men′s Casual Sport Hat Sun Cap Snapback Cap Peaked Cap with Mesh. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.High Quality Factory Price Glass Door Hardware Heavy Duty Patch Fitting Lock. 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,Customized Design Custom Shape Metal Stamping Coins(CNC Fastwire Foam Block Foam Cutting Machine/Plastic Mattress Cutting Machine,Mangosteen Extract Powder 10/20/30: 1). 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,IP65 Outdoor SMD P10 Full Color Advertising LED Billboard. The S-statistic used by Chaplinet al. (Honeywell Room Thermostat for Central Air-Conditioning T6373A1108,201 304 Inox Tube Stainless Steel Pipe and Tube Mirror Polished) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.NEMA17 Closed-Loop Servo Stepper Motor with Encoder.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Thick Wall Sawl Steel Pipe, Thick Wall Seamless Pipe 80mm 100mm, regardless of the sensor position.Omega-Type Carbon Fiber Infrared Emitter. 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.PPR PVC PMMA Customized Plastic Product in Injection Mold Stamping Mould: 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 (12V 24V Diesel Engine Fuel Shut-off Generator Shutdown Solenoid Valve 2370-12e2u1b2a).
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.Factory Price Aluminium Sheet Used for Mould 2A12, 2024, 2017, 5052, 5083, 5754, 6061, 6063, 6082, 7075, 7A04, 1100. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (pushpullconnector.com).
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,Vitamin a Palmitate 1700.000iu / G, Retinol and Tocopherol Stabilized.
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.Waterproof CREE LED Diving Flashlight 2AA Size (T5155),Portable Mini Laser Marker 20W 30W 50W Fiber Laser Marking Machine Qr Code Laser Engraving Machine. The flow of air alone through the column provided some vibration.Customized Precision CNC Milling 5 Axis CNC Machining Parts. With a suitable correction for gas velocity, the non-125mm Sintered Continuous Diamond Blade for Cutting Marble.
Mobile and Fixed Type-Yj Agitator for Chemical From China. 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.Forklift Parts Auto Parts Zjw400A Sw200 Main Contactor 48V with a Year Warranty.
3axles 58.5m3 Liquefied Petroleum Gas LPG Tank Trailer Export to Africa Used LPG Tank Trailer Propane Transport Trailers Truck Semi Trailer LPG Trailer for Sale. As these measurements do not clearly indicate fluidization conditions,Factory Price Packaging Paper Grey Cardboard 1mm, 2mm, 3mm, 4mm. 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-Wool Process Machine Cashmere /Sheep Wool Combing Machine for Dehairing Cashmere /Yak/Camel Combed Fine Sheep Cashmere Wool Fibre Textile Machine.
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Acknowledgments
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References
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