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FIBER OPTIC EXTENSIONS FOR VIEWING HEADS
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 GENERAL DESCRIPTION
The IRIS Fiber Optic Viewing Head Extension makes it possible to see
a flame in a hostile environment such as where intense heat or chemicals
are present.
A
Fiber Optic Bundle is used to transmit flame radiation to the remote
IRIS Viewing Head. Flexible stainless steel tubes enclose the fiber optic bundle
with forced air injected for cooling.
A simple lens is used to focus the
flame to one end of the fiber optic bundle, with the other end coupled
directly to the Viewing Head. This effectively extends the optical path
of a standard IRIS viewing head allowing for greater
flexibility in sighting flames.
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FEATURES |
- TRANSMISSION UP TO 40 FEET
- WITHSTANDS HIGH TEMPERATURES
- WITHSTANDS HIGH VIBRATIONS
- CORROSION PROTECTED STAINLESS STEEL CONSTRUCTION
- 2 DIFFERENT LENS ASSEMBLIES FOR CHANGING ANGLE OF VIEW
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APPLICATIONS |
- TILTING BURNERS FIRING PULVERIZED COAL, OIL OR GAS
- APPLICATIONS WHERE NORMAL SIGHTING IS IMPOSSIBLE
- HOSTILE ENVIRONMENTS
- LIME KILNS
- BLACK LIQUOR RECOVERY BOILERS
- THERMAL OXIDIZERS
- INCINERATORS - BIOMASS AND OTHER WASTE FUEL STREAMS
- GAS AND OIL FIRED TURBINE GENERATOR SETS
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APPLICATION TYPES |
| The IRIS fiber optic viewing head extension is
particularly useful for solving the sighting problems associated with
tilting or movable burners. The flame envelope from this type of burner
can be tilted from a horizontal position up or down as much as 30 degrees.
It would be impossible to follow this flame pattern with a fixed sighting
through the wind-box. Welding the tip guide (lens end) of this viewing
head extension to the movable air compartment nozzle solves this problem.
The IRIS fiber optic viewing head extension can also be used in
applications where it is impossible to find a clear unobstructed view of
the flame using a standard sight pipe. The viewing head extension is
mounted inside the furnace for a clear unobstructed view of the flame.
Further applications would be those involving hostile environments. For
example, the radiated heat from the burner front of a lime kiln may
prohibit the use of a viewing head in this location even though there is
an adequate supply of purge air. Another application would be gas and oil
fired turbines where there can be a combination of high vibration,
temperature and pressure excursions. Generally speaking, the IRIS fiber
optic viewing head extension should be considered for any application
deemed too hostile for the viewing head itself. |
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DESCRIPTION OF HARDWARE |
| The IRIS viewing head extension consists of three major assemblies:
• OUTER CARRIER TUBE & TIP GUIDE
• INNER CARRIER TUBE
• LENS ASSEMBLY & FIBER OPTIC BUNDLE
One end of the OUTER CARRIER TUBE is fitted inside with 4 centering guides
(rods) for centering the INNER CARRIER TUBE LENS ASSEMBLY HOLDER. This end of the OUTER
CARRIER TUBE slips into the TIP GUIDE which is permanently fixed. One end of
the INNER CARRIER TUBE is designated the LENS ASSEMBLY HOLDER. The LENS ASSEMBLY
is coupled to the FIBER OPTIC BUNDLE. The LENS ASSEMBLY & FIBER
OPTIC BUNDLE
is fastened inside the INNER CARRIER TUBE LENS ASSEMBLY HOLDER with a pan head
screw.
There are two parts to the LENS ASSEMBLY, the LENS CARTRIDGE and the
FIBER OPTIC COUPLER. The LENS CARTRIDGE contains a lens or lenses and a quartz window with a
retaining ring. The window is forward of the lens and serves to protect the lens from
being damaged or becoming dirty due to oil spray or coking from solid fuels. The window
and lens are easily replaceable. A single plano-convex lens is normally provided for use
with any one of two FIBER OPTIC COUPLERS to provide the desired skew. These are:
A - 0° (straight)
B - 9°
A FIBER OPTIC LENS MOUNTING ADAPTER FOR 1" NPT THREAD is available for
those applications requiring only the FIBER OPTIC BUNDLE and lens.
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Fiber optics adaptor with cable |
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Lens cartridge with fiber optic
cable |
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Lens cartridge components |
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Outer carrier tube assembly |
Inner carrier tube |
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INSTALLATION & MOUNTING |
The flame signal generated in the primary combustion zone is transmitted via the
fiber optic bundle to the IRIS viewing head located outside the wind box. For
corner fired units the OUTER CARRIER TIP GUIDE is welded to an air compartment
nozzle parallel to the fuel flow. The OUTER CARRIER CENTERING GUIDE slip fits into
this OUTER CARRIER TIP GUIDE and the other end is fastened to the burner front
plate (outside the wind box) via the 3" NPT packing gland (refer to installation
manual for details).
The flexible portion of the carrier tubes allows for the vertical
movement of the tilting nozzles (± 30°). The OUTER CARRIER TIP GUIDE can be
installed either in the right or left hand side of the nozzle and the outer carrier should
be brought straight through the air compartment.
It is important that the flexible portion
of the carrier tube be brought straight through without any horizontal bend to prevent any
twisting action on the assembly when the viewing end moves vertically up and down.
The INNER CARRIER TUBE containing the LENS ASSEMBLY & FIBER
OPTIC BUNDLE
slides into the OUTER CARRIER where it is centered in the OUTER CARRIER
CENTERING GUIDE. The other end of this assembly is fastened according to the
instructions in the installation manual. It is to this assembly that the IRIS
viewing head is mounted.
Purge air is injected at two points. The air entering at the IRIS viewing
head flange (½" NPT port) travels inside the INNER CARRIER TUBE exiting just
in front of the LENS ASSEMBLY. The air entering the OUTER CARRIER TUBE
(1" NPT port) travels in the space between the INNER CARRIER TUBE and OUTER
CARRIER TUBE exiting through the OUTER CARRIER. |
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SPECIFICATIONS |
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MATERIAL |
Carrier Tubes |
Furnace Side - Stainless Steel
Rear Portions: Steel Pipe |
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MOUNTING |
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Outer carrier tube guide (3.375" OD. x
9" long), Stainless Steel, welded to Air Compartment Nozzle.
Outer Carrier Tube connected to 3" NPT Mounting Assembly via 3
locking screws. |
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PURGE AIR |
Volume Required |
22CFM at 1 PSI above furnace pressure. |
| Connections |
1" NPT on Outer Carrier Mount
1/2" NPT on Viewing Head Flange |
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OPTICS |
Transmission |
40 feet maximum |
| Temperature |
Lens: 500° F (260° C) Max
Fiber Optics: 500° F (260° C) Max |
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