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FIELD OF THE INVENTION:
The invention relates to a System of Cooling flame scanners in Gas
turbine plant. More particularly the Invention relates to an improved
system For cooling flame scanners in desert environment.
BACKGROUND OF THE INVENTION:
Flame scanners are generally used to conflrm availability of flame In
the combustion system. Flame scanner is an electronic device
requiring continuous cooling and is provided with atleast one water
jacket on the body. Water is circulated through the jackets In a
primary closed loop circuit which in turn coded in a heat exchanger
having a secondary cooling water device. The secondary cooling
water is cooled in a cooling fan modute or in a cooling tower.
There are two types of cooling water means available for example,
open type and close loop type. In open type system, water is taken
Inside form a natural source like river, sea etc and the return water Is
left In to the same source. In closed type system,the water is
reclrculated back in to the device and cooling tower is used to reject
heat to the atmosphere.

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Cooling water required for the flame scanners is very small when
compared to cooling water requirements of other equipment In power
plant. For power plants having large cooling towers, a small tap-off is
taken from the cooling device for cooling the flame scanner. Meeting
requirements of cooling the scanner is not a problem for power
plants having water source and having cooling towers.
But, tne plants located in desert environment do not have large
cooling source due to scarcity of cooling water. In such plants, direct
afr blast fan cooling modules are used. This type of cooler used for
cooling lubrication oil of Gas turbine is called Air blast oil cooler. In
such cases, air blast-cooling water module is used for small flow
requirement of cooling the scanner. The air-blast cooling module is a
packaged unit having its own fans, cooling elements, pumps,
expansion tanks, instrumentation, piping and control device,
OBJECTS OF THE INVENTION:
It is therefore an object of the invention is to propose an improved
system for cooling flame scanners in a gas turbine piant which
eliminates the disadvantages of the prior art.
Another object of the Invention is to propose an improved system for
coolling flame scanners In a gas turbine plant which eliminates the
requirement of a secondary cooiing means.

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A further object of the invention is to propose an improved system
for cooling flame scanners tn a gas turbine plant which is simple,
compact, economic and easy to maintain.
SUMMARY OF THE INVENTION:
Accordingly there Is provided an improved system for cootlng flame
scanners in a gas turbine plant operating tn a desert environment,
comprising an expansion/mark-up tank disposed at a level higher
tnan a level of a water-circulating pump, the water circulating pump
being disposed in a closed-loop circuit for cooling atleast one flame
scanner. And a branch-off from a return line of a lub-oil cooler device
for allowing colled lub-oll from the device Is provided to allow the
flow of cooled lub-otl Into a plate-type heat exchanger, the plate-type
heat exchanger being operably connected to the close-loop circuit
carrying scanner-cooling water.
Following are the benefits of the Improved system for cooling flame
scanners;
1) Reduction In Initial Installation cost due to use of less expensive
plate type heat exchanger In place of cooling water module.
2) Reduction in auxiliary power consumption in the order of 1000
Watts for entire life of the Power plant.
3) Reduction in requirement of ground space for new plants as
the plate type heat exchanger is installed with in existing
equipment and no separate space required.

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BRIEF DESCRIPTTOH OF THE ACCOMPANYING DRAWINGS:
1. Figure 01: a schematic diagram of an existing flame-
scanner cooling system
2, Figure 02; a schematic diagram of an improved system
for cooling flame scanners in desert environment.
DETAIL DESCRIPTION OF A PREFERRED EMBODIMENT OF
THE INVENTION;
As shown In figure-1, the flame scanner (3) is cooled by a ckeed-
loop water circulating means using a circulating pump (2). The
water-cooling the scanner is thereafter cooled by a coding module
(1) disposed in the closed-loop water circulating means. An
Expansion or make-up tank (4) Is operably connected to the
circulating pump (2) for supply of cooling water.

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Flgure-2 shows an Improved system for cooling the circulating water
which cools the flame scanner (3). The new system eliminates the
requirement of the cooling module (1) or the prtor art. In order to
achieve the cooling of circulating water, a branch-off (5) is
incorporated in the return-line of a lub-oil cooler device of the
system,
Further, a plate-type heat exchanger (6) Is disposed in the closed-
loop water circulating means. The water after cooling the flame
scanner (3) is caused to flow through the heat exchanger (6). The
branch-off (5) from the lub-oil cooitng return line is opera bly
connected to the heat-exchanger (6). Thus the circulating water gets
cooted and re-circulated via the closed-loop circuit. The returned lub-
oll from the heat exchanger (6) is flowed back to lube oil reservoir.

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WE CLAIM:
1. An improved system for cooling flame in a gas turbine plant
operating in a desert environment, comprising :-
- an expansion/mark-up tank disposed at a level higher
than a level of a water-circulating pump (2), the water
circulating pump (2) being disposed in a closed-loop
circuit for cooling atleast one flame scanner(3);and
- a branch-off (1) from a return line of a lub-oil cooler
device for a allowing cooled lub-oil from the device to flow
into a plate-type heat exchanger (6), the plate-type heat
exchanger (6) being operably connected to the close-loop
circuit carrying scanner-cooling water.
2. The system as claimed in claim 1, wherein the lub-oil after
cooling the scanner cooling water is caused to return to the
lub-oil cooling device via an exit line.
3. An improved system for cooling flame in a gas turbine plant
operating in a desert environment, as substantially described
and illustrated herein with reference to the accompanying
drawings.

Accordingly there is provided an improved system for cooling flame
scanners in a gas turbine plant operating in a desert environment,
comprising an expansion/mark-up tank disposed at a level higher
than a level of a water-circulating pump, the water circulating pump
being disposed in a closed-loop circuit for cooling atleast one flame
scanner. And a branch-off from a return line of a lub-oil cooler device
for allowing colled lub-oil from the device is provided to allow the
flow of cooled lub-oil into a plate-type heat exchanger, the plate-type
heat exchanger being operably connected to the close-loop circuit
carrying scanner-cooling water.
Following are the benefits of the improved system for cooling flame
scanners,
1) Reduction in initial installation cost due to use of less expensive
plate type heat exchanger in place of cooling water module.
2) Reduction in auxiliary power consumption in the order of 1000
Watts for entire life of the Power plant.
3) Reduction in requirement of ground space for new plants as
the plate type heat exchanger is installed with in existing
equipment and no separate space required.