High-temperature gas stream cleanup test facility Page: 5 of 8
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primary air, and dilution air may be supplied up
to the design pressure for a maximum through-
put of 320 kg-hr-' (700 lbjhr), or a maximum
firing rate of 140 kW (480 x 103 Btu/hr). The
combustion product temperature is adjustable by
controlled heat loss and dilution air injection. A
port is provided at the combustor discharge for
introducing particulate material. The burner is a
concentric tube axial flow swirl generator 
(swirl number N, = 0.78) discharging into a
diverging refractory nozzle. Combustion air
mixes with fuel from radial ports in the annulus
upstream of the swirl vanes. Testing at atmo-
spheric pressure indicates the burner is capable
of 8:1 turndown at stoichiometric conditions
with good flame stabilization. A performance
map over the entire range of pressure and
equivalence ratio will be obtained during
Figure 3 shows the filter vessel (without the
head) in cross section. The vessel is mounted
Picast 3000 Min.
Figure 3. Filter Vessel Cross Section
vertically and is refractory lined, providing a test
volume 203 mm (8 in) in diameter by 3 m
(10 ft) in length. The supporting structure has a
stairway, deck, and an integral hoist to simplify
filter change-out and maintenance. Filter mount-
ing is provided by a water-cooled tube sheet that
may be custom fabricated to accommodate the
filter design under test. Eight ports are available
for cooling water, back pulse jets, and instru-
mentation. Two flanges provided on one side of
the vessel offer a choice of combustor mounting
positions. Three nitrogen-purged viewing ports
are furnished for remote observation via closed
circuit TV; one of these may be sacrificed for
additional instrumentation, if required. The dust
hopper (not shown) is bolted to the lower flange
and may be interchanged with a spare to provide
substantially continuous testing.
The combustion product stream is seeded
with particulate material by a loss-in-weight,
twin-screw feeder mounted in its own pressur-
ized vessel. Dust may be fed at rates of
23 kg-hr-1 (50 lbm/hr) or more, depending on
dust properties and the feed screws selected; the
complete feed screw set range is available.
Tests indicate that feed rate error is typically
4 percent full scale at the 95 percent confi-
dence level. The feeder vessel is pressurized by
nitrogen at 1.3 MPa (185 psia), which provides
the motive power for conveying particulate
material to the combustor dust port. The dust
feeder supply hopper may be replenished while
the vessel is pressurized. METC has a stock of
fly ashes from various sources. Dust supplied
by CRADA partners can also be used, if desired.
Back Pulse Cleaning System
The back pulse cleaning system consists of a
nitrogen back pulse surge tank, four fast-acting
back pulse valves, and a dedicated high-speed
data acquisition and control computer. The
system may be pressurized up to 3.1 MPa
(450 psia), which gives a 5.6:1 back pulse to
process pressure ratio when the system is oper-
ating at design pressure. Back pulse valve firing
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Ontko, J. & Chiang, T. High-temperature gas stream cleanup test facility, article, December 1, 1995; Morgantown, West Virginia. (https://digital.library.unt.edu/ark:/67531/metadc627802/m1/5/: accessed June 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.