Spray Dryer SOP 10-20-2010.pdf - Department of Chemical ...
Spray Dryer SOP 10-20-2010.pdf - Department of Chemical ...
Spray Dryer SOP 10-20-2010.pdf - Department of Chemical ...
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<strong>Spray</strong> <strong>Dryer</strong> Standard Operating Procedure<br />
Created: October 19, <strong>20</strong><strong>10</strong> by Bob Cox<br />
Revised: October 19, <strong>20</strong><strong>10</strong> by Bob Cox<br />
University <strong>of</strong> Utah, <strong>Chemical</strong> Engineering<br />
This document outlines the operating procedures for the spray dryer located in room<br />
35<strong>20</strong> MEB.<br />
Overview:<br />
Prior to operating the Bowen <strong>Spray</strong> <strong>Dryer</strong> familiarize yourself with the plumbing, display<br />
gauges, control panel, pump, pump drive, and blower.<br />
The Bowen Engineering <strong>Spray</strong> <strong>Dryer</strong> is a pilot scale device commonly used for drying<br />
thermally sensitive materials. In the Senior Lab, it has been used for drying a variety <strong>of</strong><br />
aqueous solutions including soap, salt and beer.<br />
Verify that any solution pumped through the system will not clog the lines or the spray<br />
nozzle.<br />
Check with lab manager before preparing a new solution.<br />
Health & Safety Warnings<br />
• Safety glasses must be worn when operating this equipment.<br />
• The manual gas control valve must be closed after each run.<br />
• Do not remove the drive shaft guard.<br />
• To prevent overheating the gas burner will not light until the blower is powered<br />
on.<br />
• Use caution when opening the spray dryer door during operation as liquid may<br />
escape the drying chamber.<br />
• Caution – exterior surfaces may be hot!<br />
• Rotating equipment hazard: Use caution when in close proximity to the pump.
Procedure:<br />
1. Mix feed solution.<br />
2. Set (open) valves on feed tanks to feed stock solution to pump as desired.<br />
3. Open pump petcock valve until feed stock flows out <strong>of</strong> valve then close the<br />
valve.<br />
4. If feedstock does not flow out <strong>of</strong> the pump valve, contact the lab manager.<br />
5. Open main gas pipe valve located on the rear <strong>of</strong> the spray dryer, ½ turn so that<br />
the valve headpiece is in line with the pipe.<br />
6. Turn on the Omega HH509R thermometer located on the front <strong>of</strong> the spray<br />
dryer.<br />
7. Open the main air supply valve located on the right side <strong>of</strong> the dryer ½ - 1 turn.<br />
8. Set the air pressure regulation to <strong>10</strong> PSI. The air pressure regulator is located on<br />
the lower front panel. You may adjust the air pressure as required as you finetune<br />
your operating parameters. The airflow rate may be adjusted using the<br />
needle valve on the airflow rotometer. The units are SCFH<br />
9. Open the liquid flow valve located on the base <strong>of</strong> the liquid flow rotometer on<br />
the front <strong>of</strong> the dryer.<br />
<strong>10</strong>. Turn on the main power switch located on the upper left <strong>of</strong> the control panel.<br />
11. Verify that the Baldor Drive Controller (VS1MD) displays 0.00.<br />
12. Verify that the FWR and STP/FLT indicator lights are on and the PROG and RUN<br />
lights are <strong>of</strong>f.<br />
13. If the PROG light is on do not proceed, contact the lab manager.<br />
14. Note that when adjusting the speed setting on the VS1MD, you must push firmly<br />
and hold the increment / decrement arrow buttons in order for the setting to<br />
change.<br />
15. Firmly press and hold the down arrow on the VS1MD, if the numbers on the<br />
display start to decrease hold the down arrow until the display reads 0.00. If the<br />
display reads 0.00 when the down arrow is held down, proceed to the next step.
Check the chamber:<br />
Open the chamber door.<br />
The chamber light switch is located on the right side <strong>of</strong> the control panel.<br />
Verify there are no obstructions in the chamber.<br />
If the chamber requires cleaning, use the hose located behind the spray dryer to clean<br />
the system. Cleaning supplies are located in the stock room.<br />
It is your responsibility to clean the spray dryer after each use.<br />
Verify that the spray nozzle is connected to the air and feed lines.<br />
Close the chamber door.<br />
Latch both chamber door fasteners to secure the door.<br />
Set pump speed:<br />
1. Verify that the flow control valve on the flow rotometer is rotated all the way to<br />
the left, open <strong>10</strong>0%.<br />
2. Press and hold the up arrow button on the VS1MD, the display will increment,<br />
continue to hold the up button until the display reads ~ <strong>20</strong>.00; this is a good<br />
starting value for the pump speed. A set point <strong>of</strong> <strong>20</strong> corresponds to a flow <strong>of</strong><br />
approximately 2 GPH.<br />
3. Depending on the feed solution, a set point <strong>of</strong> approximately <strong>20</strong> is required to<br />
establish a fairly stable flow.<br />
4. The flow rate is in GPH as displayed on the small rotometer.<br />
5. It is recommended to use the pump speed to control flow. Not the rotometer<br />
flow valve.<br />
6. The pump speed may be adjusted at any time during operation my firmly holding<br />
down the up / down arrows on the VS1MD.<br />
7. The maximum pump speed is 60.00 the minimum speed set point is 0.00. Note<br />
that the pump drive will not rotate if the set point is below approximately 3.50.<br />
8. Press the start button on the VS1MD to start the pump.<br />
Stopping the pump:<br />
To stop the pump push the red STOP / RESET button located on the upper right <strong>of</strong> the<br />
VS1MD.
Restarting the pump:<br />
Pushing the red START button on the VS1MD will immediately start the pump at the last<br />
set point.<br />
To display the set point currently in the controller memory, press the up/down arrow<br />
button before pressing the start button.<br />
If you wish to start the pump at a speed other than the last set point use the up/down<br />
button to set the desired set point prior to pushing the start button.<br />
Start the blower:<br />
Push the black start button on the fan control panel; you should immediately hear the<br />
blower power up.<br />
Setting the burner temperature:<br />
The Partlow burner temperature adjustment is located on the rear <strong>of</strong> the spray dryer, to<br />
the right <strong>of</strong> the main gas valve. The temperature may be adjusted at any time during<br />
operation.<br />
Lighting the burner:<br />
Note - the blower must be running in order to ignite the burner.<br />
Verify that the main gas valve is open.<br />
Push the black start button (burner control) located directly above the fan start/stop<br />
control.
Sample Collection:<br />
Sample material is collected in the bell jar located at the bottom right <strong>of</strong> the spray dryer.<br />
Additional bell jars and spray nozzles are located in the workbench in front <strong>of</strong> the spray<br />
dryer.<br />
Shutdown:<br />
Turn <strong>of</strong>f the main power switch.<br />
Close the main gas valve.<br />
Close the feed valves (ball valves) that control the feed flow from the feed tanks to the<br />
pump.<br />
Drain & rinse the feed tanks as needed.<br />
Rinse the spray dryer chamber.<br />
If you plan on leaving feed solution in the tanks overnight, it must be labeled.