GEK Wiki / Instrumented Wood Pellet Run 092309
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Instrumented Wood Pellet Run 092309

Page history last edited by bk 11 years, 2 months ago

Date: 2009/09/23

 

Purpose

 

This is a continuing series of tests to explore the relationships between tar production and various critical measurements in the reactor.  The goal is to be able to use temp and pressure readings for gasifier diagnostics and establish a formal set of "conditions needed" for clean gas production.  Our hypothesis is that we can most accurately correlate tar production with temps maintained at the reduction restriction, which approximately measures how well x temp has spread and filled the hearth area for tar cracking.

 

This run used the same tar testing methodology and pressure setpoint experimental design as used on the Instrumented Walnut Shell Run 082409.

Results from the tar testing will be posted shortly.

 

The primary change in this run was a switch to wood pellets.

 

Other tests in this series are linked to from the GEK User Pages and Run Reports page.

 

Methods

This run was intended to repeat the same conditions and method of the 08/24/09 run with wood pellets. For this run the short auger/drying bucket design was used (the auger remained strictly for reactor filling, the cowling gas->drying bucket pathway was not connected).

 

Diagram

Diagram of the experimental setup. Not shown: Tar fence, fuel detect "plunger". Not to scale.

 

Fuel

Wood Pellets

  • bulk density:  656 kg/m3 (1 1L sample)
  • void space: 42% (water in 600 mL vessel)
  • moisture content: 8.9% dry basis, 8.2% wet basis (first two bags, after one day open to air)
    • 5.9%  dry basis, 5.5% wet basis newly opened (first two bags). A new third bag was added after 160 mins, presumably at this MC.

Start Up

 

Experimental Run

 

Tar Sampling

 

Results

Fuel and Air Mass Flow

 

Critical Temperatures

 

Reactor Flows

 

Reactor Vacuum

 

Contour Plot of Vertical Temperature Distribution with Time

 

Reactor Conditions

Fuel detect plunger worked automatically with pellets. Increased auger run time occurs at higher flow rates.

 

Measured Tar Correlations with Reactor Conditions

(pending)

 

 

 

 

 

 

 

Run Description

 
Run Name: Instrumented Wood Pellet Run
Run Location: Shipyard, Berkeley, CA
Operators: Bear, Charlie
Date: 09/23/09
   
Fuel  
Type: Wood Pellets
Moisture Content: first two bags (open one day), to 160 mins: 8.9% dry basis, 5.9% dry basis third bag (assumed from MC of first two bags when initially opened)
Angle of Repose: ND
Ash Content: ND
Void Space: 43% (water in 600 mL vessel)
Bulk Density: 656 kg/m3 (wet) (1 sample, 1L vessel)
   
GEK  
Version: v3
Reactor Type: Imbert
Air Nozzle Size: 3/8" street 90°C with 3/8" cap drilled on center with 5.5 mm dia. hole, 2.75" above reduction top
Reduction Cone Height: 6
Top Reduction Diameter: 3
Bottom Reduction Diameter: 6
Tar Fence: yes
Tar Fence Height:  
Details:  
Filter: v3
Filter Media: Unmixed from last run (new for last run, softwood chip)
Fill Height:  
Details:  
   
Gas Motive Force  
Ejector yes
Jet Nozzle Type (eg barb, plug): drilled plug
Jet Exit Position:  
   
Fan no
Power Source/Voltage:  
   
Engine no
Make:  
Model:  

 

GCU Setup Form

 
Run Name: Instrumented Softwood Run
Date: 09/23/09
GCU Version: 1.0
Firmware: in development (PID control of reactor with servo controlled ejector air, timed grate shaking (1 min intervals, ~40° fwd/back rotation)
  Use
Thermocouples:  
TC0 T_bred - bottom of reduction - 1" in from cone bottom, through manometer port
TC1 NA
TC2 T_tred - top of reduction - inside 1/4" mild steel pipe quarter round, welded closed and positioned on the top edge of the reduction cone
TC3 T_air_in - air in - inside air riser, through hole drilled co-axially with the riser tube through street 90°. 1 1/2" below top of riser.
TC4 T_comb - combustion - first TC of profile assembly. centered by ring rod assembly, 1" in front of air nozzle hole, at same elevation. Sheathed in 2" length of alumina tube, extending 1/2" below TC (1/4" OD, 1/8" ID).
TC5 T_1in - 1" above combustion. 2nd TC of assembly...
TC6 T_2in - 2" above combustion.
TC7 T_3in - 3" above combustion.
TC8 T_4in - 4" above combustion.
TC9 T_6in - 6" above combustion.
TC10 T_8in - 8" above combustion.
TC11 T_gas_out - installed in cowling gas exit port
TC12 T_flare - installed in 1 1/2" tangential entrance tube
TC13 T_gas_flowmeter - installed in 1 1/2" to 1/2" reducing T just after filter, before union based gas flowmeter
TC14 NA
TC15 NA
Drivers:  
FET BANK 1:  
VOLTAGE 12 V
FET0  
FET1  
FET2 Grate Fwd Relay (30A automotive) (FET # not confirmed)
FET3 Grate Rev Relay (30A automotive)
FET BANK 2:  
VOLTAGE  
FET4  
FET5  
FET6  
FET7  
Servos:  
SERVO1 Ejector Air Control
SERVO2  
SERVO3  
Pressure: Part (7002,5004,4006,7007,5010,7025,5050)
P0 7007 - P_comb - pressure at combustion, via profile assembly
P1 7007 - P_reactor - taken from reactor manometer port
P2 7002 - P_gas_out - gas out flowmeter differential pressure
P3 7002 - P_air_in - air in flowmeter differential pressure (flowmeter installed on V3 air cowling inlet)
I/O:  
RS-232  
CAN-BUS  
ANALOG0 P_filter sensor input from breadboard (7007)
ANALOG1
ANALOG2 Auger plunger on sense (12V motor line, through voltage divider)
ANALOG3  
Frequency Counter

 

 

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