"HC" AIRFLO ® In-duct firing line burner

"HC" AIRFLO ® In-duct firing line burner
Duct Burners - “HC” AIRFLO®
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"HC" AIRFLO®
In-duct firing line burner

High heat release up to 8.5 MBtu/h per unit of burner length (12 in.)

Clean combustion with low CO and NOx emission levels

Minimal process air pressure drops locally across the burner as low as 0.2 "wc

Operates in fresh air, preheated air (up to 1100 °F) or low oxygen turbine exhaust gases

Fires on natural gas, H2 and all mixtures. Special versions for propane, butane, LPG and
refinery gases are available

100 % stainless steel construction for long life performance

No external combustion air required

Plug mounted in duct wall insures low installation costs

Burner capacity independent of back pressure variations and uniform heat distribution along
burner length due to high gas pressure
w w w . m a x o n c o r p . c o m
combustion systems for industry
MAXON reserves the right to alter specifications and data without prior notice.
© 2007 Copyright Maxon Corporation. All rights reserved.
4 - 22.2 - 2
E - i - 2/13
Duct burners - “HC” AIRFLO®
Product description
MAXON Series “HC” AIRFLO® burners consist of a stainless steel burner manifold which not only serves as a burner frame but
also transports the fuel gas to the gas nozzles and supports the diverging Hastelloy mixing plates.
5
1
7
6
3
1) Gas inlet
2) Manifold
3) Mixing plate
4) Plain end plate
5) Pilot end plate
6) Gas nozzle
4
7) Deflector plate
8) Pilot gas ports
L: Burner length
8
2
L
Principle of operation
The burner is mounted directly into the process air stream being heated. Thanks to the unique design of the V-shaped mixing
plates, the high velocity injected fuel and the process air are intensively mixed. The required oxygen for combustion is
progressively drawn from the process air stream.
The special designed aeration patterns in the mixing plates insure progressive mixing, superior cross ignition, reliable flame
retention, clean combustion over the full capacity range and increased flammability on low O2 applications.
A small part of the process air stream to be heated is forced through the burner mixing plate holes and is used as primary
combustion air. This primary combustion air is mixed with the gas flow injected through the pilot gas ports. The flames retain on the
inside of the mixing plates and serve to ignite the high velocity fuel jets injected through the gas nozzles. These jets create large recirculating areas in the flame. This thorough mixing guarantees high capacity clean combustion, avoiding hot spots in the flame
and thus reducing thermal NOx formation.
This unique principle of operation allows “HC” AIRFLO® burners to operate with both low NOx and low CO, over the complete
turndown.
w w w . m a x o n c o r p . c o m
combustion systems for industry
MAXON reserves the right to alter specifications and data without prior notice.
© 2007 Copyright Maxon Corporation. All rights reserved.
4 - 22.2 - 3
E - i - 2/13
Duct Burners - “HC” AIRFLO®
Complete burner assembly
1) Mounting plug
2) LVDT/HC pilot burner
(see section 4-22.4 for
detailed information)
3) Gas inlet 2”
9
4) Mixing plates
5) Mounting support
6) Test connection
(upstream process air
pressure)
5
2
7) Test connection on
LVDT/HC pilot burner
(downstream process
air pressure)
8)
UV scanner connection
9) Process air flow
direction
6
4
3
7
8
2
1
All “HC” AIRFLO® burners include a stainless steel mounting plug which not only supports the burner but also carries the pilot
burners and accessories such as ignition transformers, UV scanners etc. A stainless steel mounting support to carry the weight of
the burner is standard included. Thus the burner comes as a complete package, allowing easy installation on site.
w w w . m a x o n c o r p . c o m
combustion systems for industry
MAXON reserves the right to alter specifications and data without prior notice.
© 2007 Copyright Maxon Corporation. All rights reserved.
4 - 22.2 - 4
E - i - 2/13
Duct burners - “HC” AIRFLO®
Available "HC"-AIRFLO® sizes
"HC" AIRFLO® burners are always supplied as “slide-in-units” with a mounting plug which can be easily flanged onto the duct.
They are custom-built to fit into your duct, with a flame-spread (= burner length) starting from 1 ft going up to 14 ft in steps of 0.5 ft.
Three types are available, depending on burner length and duct width:
"HC" AIRFLO® Type
Burner length
Max. duct width (in.)
Type S
1 ft to 7.5 ft
160
Type M
4 ft to 10 ft
140
[2] [3]
Type L
8 ft to 14 ft
140
[2] [3]
[1]
[1] valid for upstream temperatures up to 1100° F.
[2] can be increased to 315 in. when inlet temperature does not exceed 1000° F.
[3] can be increased to 315 in. with max inlet temperatures up to 1200° F when higher grade materials are used for burner supports.
Contact MAXON for larger duct widths, and/or burner lengths.
Typical burner data
The data given in this table apply for nominal burner capacities of 5.12 MBtu/h per foot. In some specific applications the actual
maximum capacities can be considerably higher (up to 8.5 MBtu/h per foot). Refer to specifications for further details.
Typical burner data
Fuel : natural gas with 1000 Btu/ft³ HHV - sg = 0.6 [1]
Stated pressures are indicative. Actual pressures are a function of air humidity, altitude, type of fuel and gas quality
Boiler firing
Application
Nominal capacity per foot
TEG-Firing [2]
[4]
Min. capacity per foot
Max. upstream temperature
[5]
Max. downstream temperature
Process Firing
AUX-Firing
[3]
High temp.
(Tin > 212° F)
Low temp.
(Tin < 212° F)
MBtu/h HHV
5.12
5.12
5.12
5.12
MBtu/h HHV
0.68
0.68
0.68
0.50
°F
1100
100
°F
1750
1400
14.5
11 … 16
Fuel pressure at nominal capacity
[6]
psi
Flame length at 50 % capacity or up
[7]
ft
1100
210
1750
1750
14.5
14.5
14.5
8 … 15
11 … 16
8 … 15
[5]
[1]
[2]
[3]
[4]
sg (specific gravity) = relative density to air (density air = 0.0763 lbs/ft³(st)).
TEG = turbine exhaust gas
AUX = auxilary firing
Maximum capacity will depend on application boundary conditions such as acceptable flame length, required emissions, available oxygen,
up/downstream temperatures, duct lay-out, process air differential pressure, …). Therefore, the actual maximum capacity might be lower than
5.12 MBtu/h per foot or could be up to and even above 8.5 MBtu/h per foot in specific applications.
[5] Upstream temperatures up to 1200° F are possible with higher grade materials (contact MAXON).
Limitation on downstream temperature from 1750 °F down to 1400 °F is due to possible risk of higher NOx emissions when this limit is
crossed.
[6] The stated pressures are valid for burner sizes up to 4 ft. For larger burners, the gas inlet pressures will be higher. Refer to specifications for
detailed information. Stated pressures are measured at burner gas inlet tube.
[7] Flame length is only given as a guideline. Actual flame length depends on a number of parameters such as process air oxygen level, process
air pressure drop across burner. (contact MAXON for specific information).
w w w . m a x o n c o r p . c o m
combustion systems for industry
MAXON reserves the right to alter specifications and data without prior notice.
© 2007 Copyright Maxon Corporation. All rights reserved.
Duct Burners - “HC” AIRFLO®
4 - 22.2 - 5
E - i - 2/13
Applications
MAXON Series "HC" AIRFLO® burners are designed for fresh and recirculating process air heating applications. It is possible to
operate the "HC" AIRFLO® burner in a process air stream with 12 vol% or less O2 content, provided adequate inlet temperatures
are available. The burner design ensures that requirements of space, capacity and low pressure drops of any application are met.
Typical applications
 Turbine exhaust gas (TEG) reheat applications, where low process air pressure drops, high capacities and high quality combustion are required.
 TEG/AUX installations where clean reheating of TEG is combined with high capacity fresh air firing operation.
 Start-up burners for fluidized bed combustion.
 Large incinerators.
 Processes where (recirculating) air has to be heated, with oxygen levels down to 12 % if sufficiently preheated.
 High capacity fresh air heating.
Application example
MAXON "HC" AIRFLO® burner installed in an upwards inclined duct:
supplementary firing of turbine exhaust gases in a co-generation installation.
1
3
1) HC-S 5.5 ft burner
2) SMARTLINK® fuel control valve
3) Series 8000 pneumatic
safety shut-off valves
4) Control panel
5) Gas pipe-train
6) Cooling air skid
2
6
w w w . m a x o n c o r p . c o m
combustion systems for industry
MAXON reserves the right to alter specifications and data without prior notice.
© 2007 Copyright Maxon Corporation. All rights reserved.
4
5
4 - 22.2 - 6
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Duct burners - “HC” AIRFLO®
Dimensions and weights
"HC" AIRFLO® type S (1 ft – 7.5 ft)
W
D
E
L
F
1
1) Mounting plug
2) Gas inlet 2”
3
4) Scanner connection Rp1
2
A
3) LVDT/HC pilot
burner
B
2
4
3
Dimensions in in. unless stated otherwise
A
B
D
E [1]
L
F [1]
W
22
12
7.8 (min) to 23.6 (max)
8 (min)
burner length
12 (min)
157 (max)
weight (lbs)
143 + (11 x burner length in ft)
[1] Valid when duct has internal insulation (without cladding).
In case of sheet metal wall, E and F should be at least 20 in.
"HC" AIRFLO® type M (4 ft – 10 ft)
W
D
1) Mounting plug
4) Scanner connection Rp1
L
F
2
1
2) Gas inlet 2”
C
B
3
2
4
A
3) LVDT/HC pilot
burner
E
3
Dimensions in in. unless stated otherwise
A
B
C
D
E [1]
L
F [1]
W
weight (lbs)
22
26
28
7.8 (min) to 23.6 (max)
8 (min)
burner length
16 (min)
314 (max)
388 + (15 x burner length in ft)
[1] Valid when duct has internal insulation(without cladding).
In case of sheet metal wall, E and F should be at least 20 in.
w w w . m a x o n c o r p . c o m
combustion systems for industry
MAXON reserves the right to alter specifications and data without prior notice.
© 2007 Copyright Maxon Corporation. All rights reserved.
4 - 22.2 - 7
E - i - 2/13
Duct Burners - “HC” AIRFLO®
"HC" AIRFLO® type L (8 ft – 14 ft)
W
D
E
L
F
1) Mounting plug
2) Gas inlet 2”
3
2
4) Scanner connection Rp1
4
1
C
B
A
3) LVDT/HC pilot
burner
2
3
Dimensions in in. unless stated otherwise
A
B
C
D [1]
E [1]
L
F [1]
22
26
28
7.8 (min) to 23.6 (max)
28-D (min)
burner length
16 (min)
W
weight (lbs)
314 (max) 452 + (15 x burner length in ft)
[1] Valid when duct has internal insulation (without cladding).
In case of sheet metal wall, E and F should be at least 20 in.
Typical emissions (burners only)
Thanks to the unique mixing plate design, the "HC" AIRFLO® burner creates large recirculating flame patterns which combine high
burner capacities with low emissions on both CO and NOx for the entire burner firing rate.
Read “Specifications of "HC" AIRFLO® burners” for correct and complete information on "HC" AIRFLO® burners.
w w w . m a x o n c o r p . c o m
combustion systems for industry
MAXON reserves the right to alter specifications and data without prior notice.
© 2007 Copyright Maxon Corporation. All rights reserved.
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