The design and use of a TLUD gasifier is counter-intuitive; 
rather than lighting the bottom of the feedstock pile, the 
pile of feedstock must be ignited on top (Figure 1). The 
TLUD was made out of 1/8" sheet-iron; it includes a 5' 
tall chimney with a 30" diameter, capable of holding up to 
24.5 ft
3
of feedstock. A 4"-wheel permanent split capacitor 
blower fan was housed in an 18" × 18" square box at the 
bottom of the chimney with a hinged door next to the fan 
(Figure 2). If the gasification process becomes too hot, 
resulting in ashing, or too cool, stalling the process, the 
updraft can be regulated using the fan intake vent (Figure 
2g). The box is separated from the chimney by a 1" screened 
iron mesh, which allows free flow of the draft generated by 
the fan and prevents the fan from overheating as the burnline moves from top to bottom. Two custom modifications 
were made to the original design of the TLUD (Anderson 
2009) which helped produce a uniform burn and provided 
a relatively steady control of temperature. The first was a 
detachable iron cap with an adjustable snout to control the 
smoke, and the second was a clamp fitting for an intake 
gas line. The intake gas used for this study was N
2
(99% 
commercial grade). Once the burn-line reaches the bottom, 
N2
gas is blown through the chimney, displacing any air 
(oxygen) and gradually ceasing the gasification. Flushing 
the system with an inert gas once the feedstock has been 
completely charred prevents combustion, preserves the 
char, and increases batch yields.
 
The design and use of a TLUD gasifier is counter-intuitive; rather than lighting the bottom of the feedstock pile, the pile of feedstock must be ignited on top (Figure 1). The TLUD was made out of 1/8" sheet-iron; it includes a 5' tall chimney with a 30" diameter, capable of holding up to 24.5 ft3of feedstock. A 4"-wheel permanent split capacitor blower fan was housed in an 18" × 18" square box at the bottom of the chimney with a hinged door next to the fan (Figure 2). If the gasification process becomes too hot, resulting in ashing, or too cool, stalling the process, the updraft can be regulated using the fan intake vent (Figure 2g). The box is separated from the chimney by a 1" screened iron mesh, which allows free flow of the draft generated by the fan and prevents the fan from overheating as the burnline moves from top to bottom. Two custom modifications were made to the original design of the TLUD (Anderson 2009) which helped produce a uniform burn and provided a relatively steady control of temperature. The first was a detachable iron cap with an adjustable snout to control the smoke, and the second was a clamp fitting for an intake gas line. The intake gas used for this study was N2(99% commercial grade). Once the burn-line reaches the bottom, N2gas is blown through the chimney, displacing any air (oxygen) and gradually ceasing the gasification. Flushing the system with an inert gas once the feedstock has been completely charred prevents combustion, preserves the char, and increases batch yields.
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