Title of Invention	A DEVICE FOR SMOOTH CHANGE OVER FROM GAS TURBINE (GT) MODE TO FRESH AIR FORCE DRAFT (FD) MODE WITH REDUCTION OF BACK PRESSURE TO THE GAS TURBINE
Abstract	Accordingly, there is provided a device for inducing draft in a heat recovery steam generator (HRSG) system, the HRSG being flowable connected to a gas turbine via a transition duct acting as a passage for exhaust gas from the gas turbine, the HRSG comprising: (1) a super heater formed of a plurality of tubes, (2) an evaporator consisting of a plurality of configured tubes; (3) an economizer adjacently located to the evaporator; and (4) a condensate pre heater/makeup water heater adjacently located to the economizer. The exhaust gases from the economizer/condensate pre heater/makeup water heater emitting via a stack through a device called induced draft fan. The device comprising an uptake duct, a set of blades along with shaft and an outlet duct disposed in between the last heat transfer section of HRSG and stack.

Title of Invention

A DEVICE FOR SMOOTH CHANGE OVER FROM GAS TURBINE (GT) MODE TO FRESH AIR FORCE DRAFT (FD) MODE WITH REDUCTION OF BACK PRESSURE TO THE GAS TURBINE

Abstract

Accordingly, there is provided a device for inducing draft in a heat recovery steam generator (HRSG) system, the HRSG being flowable connected to a gas turbine via a transition duct acting as a passage for exhaust gas from the gas turbine, the HRSG comprising: (1) a super heater formed of a plurality of tubes, (2) an evaporator consisting of a plurality of configured tubes; (3) an economizer adjacently located to the evaporator; and (4) a condensate pre heater/makeup water heater adjacently located to the economizer. The exhaust gases from the economizer/condensate pre heater/makeup water heater emitting via a stack through a device called induced draft fan. The device comprising an uptake duct, a set of blades along with shaft and an outlet duct disposed in between the last heat transfer section of HRSG and stack.

Full Text	2 FIELD OF THE INVENTION The present invention generally relates to a co generation/combined cycle power plant. In particular the invention relate to a Heat recovery steam generator (HRSG) system in a combined cycle/cogeneratlon plant, adaptable to downstream of Gas Turbine. More particularly, the present invention relates to a device of Integration of HRSG with Induced draft fan arranged downstream of HRSG causing reduction of backpressure to the gas turbine and for smooth change over from GT Mode to Fresh air firing mode in combined cycle and cogeneration system. BACKGROUND OF THE INVENTION It is known in conventional combined or cogeneration power plants the heat recovery steam generators are placed in between the Gas turbine exhaust gas outlet and main stack with no devices present at the outlet of Heat recovery steam generators. The prior art of reducing th back pressure to the turbine is by increasing the free gas area in the HRSG heat transfer sections and thereby reducing the exhaust gas velocity through the tubes resulting in larger HRSG. 3 Another prior of patent no PN 200 500 44859 dated 03.03.05 discloses integrating the HRSC with forced draft (FD) fan supplying fresh air to HRSG supplementary firing system burners for uninterrupted steam generation, even in cases where the Gas turbines are tripped. The disadvantages of the prior art for change over from GIF mode to FD mode do not result in smooth change over. The disadvantages of the prior art devices for reducing the back pressure to gas turbine are that they require bulky and cumbersome HRSG leading to high cost towards manufacturing operation and maintenance. Further the backpressure cannot be reduced below a certain level. OBJECT OF THE INVENTION It is therefore an object of the present invention to propose a device in HRSG for reducing back pressure of the Gas turbine, which eliminates the disadvantages of prior art. Another object of the present Invention is to propose a device in HRSG for reducing back pressure of the Gas turbine, which is compact and easy to operate. 4 A still another object of the present Invention Is to propose a device In HRSG which facilitates in avoiding leakage of exhaust gases to the atmosphere. A further object of the present invention is to propose a device in HRSG which eliminates the damage to gas turbine due to back pressure. A still further object of the present invention is to propose a device in HRSG which facilitates smooth change over from Gas turbine mode to fresh air firing mode. SUMMARY OF THE INVENTION Accordingly, there is provided a device for inducing draft in a heat recovery steam generator (HRSG) system, the HRSG being flowable connected to a gas turbine via a transition duct acting as a passage for exhaust gas from the gas turbine, the HRSG comprising: (1) a super heater formed of a plurality of tubes, (2) an evaporator consisting of a plurality of configured tubes; (3) an economizer adjacently located to the evaporator; and (4) a condensate pre heater/makeup water heater adjacently located to the economizer. The exhaust gases from the economizer/condensate pre heater/makeup water heater emitting via a stack through a device called induced draft fan. The device comprising an uptake duct, a set of blades 5 along with shaft and an outlet duct disposed in between the last heat transfer section of HRSG and stack. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Fig-1, is a schematic presentation of a HRSG disposed behind the gas turbine, with the GT Exhaust gases leaving the HRSG entering the stack directly as per the prior art. Flg-2, Is a schematic representation of the present invention with an induced draft fan in the downstream section of HRSG. Fig-3, is a schematic representation of an variant of the present invention with an induced draft fan in the downstream section of HRSG and an forced draft fan before duct burner of the of an HRSG. DETAILED DESCRIPTION OF A PREFERRRED EM BO DIM ANT OF THE INVENTION Figure 1 shows a schematic arrangement of HRSG system. The system generally comprises a Gas Turbine (1) connected by a transition duct (2) to a heat recovery steam generator (3). The HRSG (3) has a plurality of devices arranged in the following order namely a superheater, evaporator, 6 an economizer and condensate preheater. The exhaust gases leave the economizer/condensate preheater of HRSG (3) through an outlet duct (4) to stack (7). According to the present invention, as indicated in Fig 2, the GT (1) exhaust gases leaving the HRSG (3) is passed through an outlet duct (4) to the inlet of an induced draft fan (5). Further the outlet of the Induced draft fan is connected by a duct (6) to stack (7). The induced draft fan (5) disposed downstream of the HRSG (3) reduces the back pressure Imposed on the Gas turbine (1) which reduces the possible damage to the gas turbine (1) and further facilitates compact HRSG (3) construction and higher gas turbine (1) power output. Referring to figure 3, in another aspect of the present invention, a combination of a forced draft fan (8) installed before the duct burner of a supplementary fired HRSG (3) and an induced draft fan (5) disposed downstream of the HRSG (3) to facilitate changeover from GT (1) mode to Fresh Air firing mode and vice-a-versa, which further reduces the change over time from GT (1) mode to Fresh air firing mode. The combustion air duct (9) is provided to supply fresh air required for combustion during the fresh air firing mode i.e. which the GTG is not operating. 7 In an advance development of the present invention the ID Fan will be kept running under all the GTG & HRSG operating loads and the augmenting air duct (11) will be kept open to achieve smooth and fast change over operation. A further advantage of development of the present Invention with an addition of an induced draft fan (5) downstream of HRSG (3) the leakages of exhaust gases from the HRSG (3) to atmosphere improper duct connections are eliminated. According to the invention, the Heat recovery steam generator (3) disposed behind gas turbine (1) with an induced draft fan (5) device consists of Gas turbine (1); gas turbine exhaust ducting (2); Heat recovery steam generator (3); HRSG outlet duct (4); downstream induced draft fan (5); Induced outlet duct (6); the main stack (7); The exhaust gases from the gas turbine (1) through a GT exhaust duct (2) and through a considerable number of upstream heat transfer sections in HRSG (3) and HRSG outlet duct (4) before reaching the induced draft fan device (5) which facilitates in reducing and eliminating the exhaust gas leakages from HRSG (3) to atmosphere. 8 The induced draft fan (5) is arranged downstream of the HRSG (3) and is disposed between HRSG (3) and slack (7), which reduces the back pressure to the Gas Turbine. The induced draft fan (5) is sized for either no back pressure to gas turbine or for reduced back pressure to the gas turbine (1). The induced draft fan (5) device is arranged downstream of the HRSG (3) and is disposed between HRSG (3) and stack (7), which eliminates separate scanner air/seal air fans for supplying cooling air to scanners and soot blowers in cogeneration application. In another aspect of the invention, a forced draft fan (8) is arranged upstream of HRSG (3) of supplementary fired HRSG (3) and an induced draft fan (5) arranged downstream of HRSG (3), which further facilitates smooth change over from GT (1) to fresh air firing mode and vice versa. The induced draft fan (5) system device arranged between HRSG (3) and stack (7) can be either one or multiple numbers. Thus, the invention provides a system which achieves reduced back pressure to gas turbine (1) and eliminates the exhaust gas leakages from HRSG. (3). 9 The invention for reducing the back pressure to the gas turbine (1) make the HRSG (3) compact and easy to operate and maintain. Thus, the invention provides a system which facilitates smooth change over from GT mode to FD mode. 10 WE CLAIM 1. A device for smooth change over from gas turbine (G7) mode to fresh air force draft (FD) mode and reduced back pressure to the gas turbine in a system having a gasturbine (1) with an exhaust gas duct (2) through which combustion gas flows and gets entry to a HRSG (3) for heat recovery, and combustion gas passes through an outlet line (4) to a stack (7), the device comprising; a force draft fan (8) connected with combustion Air duct (9) for supply fresh air required for combustion during the fresh air firing mode; an induced draft fan (5), on inlet of which is connected to HRSG outlet duct (4) and outlet connected through a fan outlet duct (6) to stack (7); 2. The device as claimed in claim 1 wherein an induced draft fan (5) is disposed between the HRSG (3) and stack (7) in the basic combined cycle power systems with gas turbine (1) exhaust gas duct (2), HRSG 11 (3), HRSG outlet duct (6), stack (7) disposed downstream of induced draft fan (5). 3. The device as claimed in claim 1 wherein a combination of a forced draft fan (8) Installed before the duct burner. (10) of a supplementary fired HRSG (3) and an Induced draft fan (5) disposed between the HRSG (3) and stack (7) in the basic combined/co generation cycle power system with gas turbine (1), exhaust gas duct (2), HRSG (3), HRSG outlet duct (4) disposed before the induced draft fan (5) and fan outlet duct (6) stack (7) disposed down stream of induced draft fan (5) and an augmenting air duct (11) suitable opening in the duct disposed before duct burner (10) and the combustion air duct (9). Both augmenting and combustion duct can be with or without dampers. 4. The device as claimed in claim 1 wherein a single or multiple augmenting air ducts are provided with dampers for control of air. 5. The device as claimed in claim 1 wherein one or more induced draft fans may be accommodated. 12 6. A process for smooth change over from gas turbine (GT) (1) mode to fresh air force draft (FD) mode and reduced back pressure to the gas turbine (1), comprising of following steps. flowing the exhaust gas of gas turbine (1) through transition duct (2) via a duct burner (10) to heat recovery stream generator (3) wherein an outlet is attached to a Induced draft fan (5) for suctioning the combustion gas of HRSG and release it through a fan outlet duct (6) to a stack (7) or combustion air duct (9) from a force draft fan (8) and augmenting air through augmenting air duct (11) supply air to a burner (10) during fresh air firing mode while the GT (1) is in unfired mode; Augmenting air from atmosphere enters first through the augmenting air duct (11) before combustion air from combustion air duct (9) enters the butner (10) and passes through duct burner (10) HRSG (3) and gets release from HRSG through air outlet (4) which is in turn connected to an inlet of an induced draft fan for suctioning and get released through a outlet duct (6) to a stack (7); 7. A device for smooth change over from gas turbine (GT) mode to fresh air force draft (FD) mode and reduced back pressure to the gas 13 turbine in a system having a gasturbine with an exhaust gas duct through which combustion gas flows and gets entry to a HRSG for heat recovery and combustion gas passes through an outlet line, to a stack as substantially described and illustrated herein with reference to accompanying drawings; 8. A process for smooth change over from Gas turbine mode to fresh air force draft mode and reduced back pressure to the gas turbine as substantially described and illustrated herein with reference to accompanying drawings. Dated this 2nd day of JANUARY 2007 Accordingly, there is provided a device for inducing draft in a heat recovery steam generator (HRSG) system, the HRSG being flowable connected to a gas turbine via a transition duct acting as a passage for exhaust gas from the gas turbine, the HRSG comprising: (1) a super heater formed of a plurality of tubes, (2) an evaporator consisting of a plurality of configured tubes; (3) an economizer adjacently located to the evaporator; and (4) a condensate pre heater/makeup water heater adjacently located to the economizer. The exhaust gases from the economizer/condensate pre heater/makeup water heater emitting via a stack through a device called induced draft fan. The device comprising an uptake duct, a set of blades along with shaft and an outlet duct disposed in between the last heat transfer section of HRSG and stack.

Full Text

2 FIELD OF THE INVENTION
The present invention generally relates to a co generation/combined cycle power plant. In particular the invention relate to a Heat recovery steam generator (HRSG) system in a combined cycle/cogeneratlon plant, adaptable to downstream of Gas Turbine. More particularly, the present invention relates to a device of Integration of HRSG with Induced draft fan arranged downstream of HRSG causing reduction of backpressure to the gas turbine and for smooth change over from GT Mode to Fresh air firing mode in combined cycle and cogeneration system.
BACKGROUND OF THE INVENTION
It is known in conventional combined or cogeneration power plants the heat recovery steam generators are placed in between the Gas turbine exhaust gas outlet and main stack with no devices present at the outlet of Heat recovery steam generators.
The prior art of reducing th back pressure to the turbine is by increasing the free gas area in the HRSG heat transfer sections and thereby reducing the exhaust gas velocity through the tubes resulting in larger HRSG.

3
Another prior of patent no PN 200 500 44859 dated 03.03.05 discloses integrating the HRSC with forced draft (FD) fan supplying fresh air to HRSG supplementary firing system burners for uninterrupted steam generation, even in cases where the Gas turbines are tripped. The disadvantages of the prior art for change over from GIF mode to FD mode do not result in smooth change over. The disadvantages of the prior art devices for reducing the back pressure to gas turbine are that they require bulky and cumbersome HRSG leading to high cost towards manufacturing operation and maintenance. Further the backpressure cannot be reduced below a certain level.
OBJECT OF THE INVENTION
It is therefore an object of the present invention to propose a device in HRSG for reducing back pressure of the Gas turbine, which eliminates the disadvantages of prior art.
Another object of the present Invention is to propose a device in HRSG for reducing back pressure of the Gas turbine, which is compact and easy to operate.

4
A still another object of the present Invention Is to propose a device In HRSG which facilitates in avoiding leakage of exhaust gases to the atmosphere.
A further object of the present invention is to propose a device in HRSG which eliminates the damage to gas turbine due to back pressure.
A still further object of the present invention is to propose a device in HRSG which facilitates smooth change over from Gas turbine mode to fresh air firing mode.
SUMMARY OF THE INVENTION
Accordingly, there is provided a device for inducing draft in a heat recovery steam generator (HRSG) system, the HRSG being flowable connected to a gas turbine via a transition duct acting as a passage for exhaust gas from the gas turbine, the HRSG comprising: (1) a super heater formed of a plurality of tubes, (2) an evaporator consisting of a plurality of configured tubes; (3) an economizer adjacently located to the evaporator; and (4) a condensate pre heater/makeup water heater adjacently located to the economizer. The exhaust gases from the economizer/condensate pre heater/makeup water heater emitting via a stack through a device called induced draft fan. The device comprising an uptake duct, a set of blades

5
along with shaft and an outlet duct disposed in between the last heat transfer section of HRSG and stack.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig-1, is a schematic presentation of a HRSG disposed behind the gas turbine, with the GT Exhaust gases leaving the HRSG entering the stack directly as per the prior art.
Flg-2, Is a schematic representation of the present invention with an induced draft fan in the downstream section of HRSG.
Fig-3, is a schematic representation of an variant of the present invention with an induced draft fan in the downstream section of HRSG and an forced draft fan before duct burner of the of an HRSG.
DETAILED DESCRIPTION OF A PREFERRRED EM BO DIM ANT OF THE INVENTION
Figure 1 shows a schematic arrangement of HRSG system. The system generally comprises a Gas Turbine (1) connected by a transition duct (2) to a heat recovery steam generator (3). The HRSG (3) has a plurality of devices arranged in the following order namely a superheater, evaporator,

6
an economizer and condensate preheater. The exhaust gases leave the economizer/condensate preheater of HRSG (3) through an outlet duct (4) to stack (7).
According to the present invention, as indicated in Fig 2, the GT (1) exhaust gases leaving the HRSG (3) is passed through an outlet duct (4) to the inlet of an induced draft fan (5). Further the outlet of the Induced draft fan is connected by a duct (6) to stack (7). The induced draft fan (5) disposed downstream of the HRSG (3) reduces the back pressure Imposed on the Gas turbine (1) which reduces the possible damage to the gas turbine (1) and further facilitates compact HRSG (3) construction and higher gas turbine (1) power output.
Referring to figure 3, in another aspect of the present invention, a combination of a forced draft fan (8) installed before the duct burner of a supplementary fired HRSG (3) and an induced draft fan (5) disposed downstream of the HRSG (3) to facilitate changeover from GT (1) mode to Fresh Air firing mode and vice-a-versa, which further reduces the change over time from GT (1) mode to Fresh air firing mode. The combustion air duct (9) is provided to supply fresh air required for combustion during the fresh air firing mode i.e. which the GTG is not operating.

7
In an advance development of the present invention the ID Fan will be kept running under all the GTG & HRSG operating loads and the augmenting air duct (11) will be kept open to achieve smooth and fast change over operation.
A further advantage of development of the present Invention with an addition of an induced draft fan (5) downstream of HRSG (3) the leakages of exhaust gases from the HRSG (3) to atmosphere improper duct connections are eliminated.
According to the invention, the Heat recovery steam generator (3) disposed behind gas turbine (1) with an induced draft fan (5) device consists of Gas turbine (1); gas turbine exhaust ducting (2); Heat recovery steam generator (3); HRSG outlet duct (4); downstream induced draft fan (5); Induced outlet duct (6); the main stack (7);
The exhaust gases from the gas turbine (1) through a GT exhaust duct (2) and through a considerable number of upstream heat transfer sections in HRSG (3) and HRSG outlet duct (4) before reaching the induced draft fan device (5) which facilitates in reducing and eliminating the exhaust gas leakages from HRSG (3) to atmosphere.

8
The induced draft fan (5) is arranged downstream of the HRSG (3) and is disposed between HRSG (3) and slack (7), which reduces the back pressure to the Gas Turbine.
The induced draft fan (5) is sized for either no back pressure to gas turbine or for reduced back pressure to the gas turbine (1).
The induced draft fan (5) device is arranged downstream of the HRSG (3) and is disposed between HRSG (3) and stack (7), which eliminates separate scanner air/seal air fans for supplying cooling air to scanners and soot blowers in cogeneration application.
In another aspect of the invention, a forced draft fan (8) is arranged upstream of HRSG (3) of supplementary fired HRSG (3) and an induced draft fan (5) arranged downstream of HRSG (3), which further facilitates smooth change over from GT (1) to fresh air firing mode and vice versa.
The induced draft fan (5) system device arranged between HRSG (3) and stack (7) can be either one or multiple numbers.
Thus, the invention provides a system which achieves reduced back pressure to gas turbine (1) and eliminates the exhaust gas leakages from HRSG. (3).

9
The invention for reducing the back pressure to the gas turbine (1) make the HRSG (3) compact and easy to operate and maintain.
Thus, the invention provides a system which facilitates smooth change over from GT mode to FD mode.

10
WE CLAIM
1. A device for smooth change over from gas turbine (G7) mode to fresh air force draft (FD) mode and reduced back pressure to the gas turbine in a system having a gasturbine (1) with an exhaust gas duct (2) through which combustion gas flows and gets entry to a HRSG (3) for heat recovery, and combustion gas passes through an outlet line (4) to a stack (7), the device comprising;
a force draft fan (8) connected with combustion Air duct (9) for supply fresh air required for combustion during the fresh air firing mode;
an induced draft fan (5), on inlet of which is connected to HRSG outlet duct (4) and outlet connected through a fan outlet duct (6) to stack (7);
2. The device as claimed in claim 1 wherein an induced draft fan (5) is disposed between the HRSG (3) and stack (7) in the basic combined cycle power systems with gas turbine (1) exhaust gas duct (2), HRSG

11
(3), HRSG outlet duct (6), stack (7) disposed downstream of induced draft fan (5).
3. The device as claimed in claim 1 wherein a combination of a forced
draft fan (8) Installed before the duct burner. (10) of a
supplementary fired HRSG (3) and an Induced draft fan (5) disposed
between the HRSG (3) and stack (7) in the basic combined/co
generation cycle power system with gas turbine (1), exhaust gas duct
(2), HRSG (3), HRSG outlet duct (4) disposed before the induced
draft fan (5) and fan outlet duct (6) stack (7) disposed down stream
of induced draft fan (5) and an augmenting air duct (11) suitable
opening in the duct disposed before duct burner (10) and the
combustion air duct (9). Both augmenting and combustion duct can
be with or without dampers.
4. The device as claimed in claim 1 wherein a single or multiple
augmenting air ducts are provided with dampers for control of air.
5. The device as claimed in claim 1 wherein one or more induced draft
fans may be accommodated.

12
6. A process for smooth change over from gas turbine (GT) (1) mode to
fresh air force draft (FD) mode and reduced back pressure to the gas
turbine (1), comprising of following steps.
flowing the exhaust gas of gas turbine (1) through transition duct (2) via a duct burner (10) to heat recovery stream generator (3) wherein an outlet is attached to a Induced draft fan (5) for suctioning the combustion gas of HRSG and release it through a fan outlet duct (6) to a stack (7) or
combustion air duct (9) from a force draft fan (8) and augmenting air through augmenting air duct (11) supply air to a burner (10) during fresh air firing mode while the GT (1) is in unfired mode;
Augmenting air from atmosphere enters first through the augmenting air duct (11) before combustion air from combustion air duct (9) enters the butner (10) and passes through duct burner (10) HRSG (3) and gets release from HRSG through air outlet (4) which is in turn connected to an inlet of an induced draft fan for suctioning and get released through a outlet duct (6) to a stack (7);
7. A device for smooth change over from gas turbine (GT) mode to fresh
air force draft (FD) mode and reduced back pressure to the gas

13
turbine in a system having a gasturbine with an exhaust gas duct through which combustion gas flows and gets entry to a HRSG for heat recovery and combustion gas passes through an outlet line, to a stack as substantially described and illustrated herein with reference to accompanying drawings;
8. A process for smooth change over from Gas turbine mode to fresh air force draft mode and reduced back pressure to the gas turbine as substantially described and illustrated herein with reference to accompanying drawings.
Dated this 2nd day of JANUARY 2007

Accordingly, there is provided a device for inducing draft in a heat recovery steam generator (HRSG) system, the HRSG being flowable connected to a gas turbine via a transition duct acting as a passage for exhaust gas from the gas turbine, the HRSG comprising: (1) a super heater formed of a plurality of tubes, (2) an evaporator consisting of a plurality of configured tubes; (3) an economizer adjacently located to the evaporator; and (4) a condensate pre heater/makeup water heater adjacently located to the economizer. The exhaust gases from the economizer/condensate pre heater/makeup water heater emitting via a stack through a device called induced draft fan. The device comprising an uptake duct, a set of blades
along with shaft and an outlet duct disposed in between the last heat transfer section of HRSG and stack.

Documents:

00008-kol-2007-correspondence-1.1.pdf

00008-kol-2007-form-18.pdf

0008-kol-2007-abstract.pdf

0008-kol-2007-assignment.pdf

0008-kol-2007-claims.pdf

0008-kol-2007-correspondence others.pdf

0008-kol-2007-description (complete).pdf

0008-kol-2007-drawings.pdf

0008-kol-2007-form1.pdf

0008-kol-2007-form2.pdf

0008-kol-2007-form3.pdf

8-KOL-2007-CORRESPONDENCE.pdf

8-KOL-2007-EXAMINATION REPORT.pdf

8-KOL-2007-FORM 18.pdf

8-KOL-2007-FORM 3.pdf

8-KOL-2007-FORM-27.pdf

8-KOL-2007-GPA.pdf

8-KOL-2007-GRANTED-ABSTRACT.pdf

8-KOL-2007-GRANTED-CLAIMS.pdf

8-KOL-2007-GRANTED-DESCRIPTION (COMPLETE).pdf

8-KOL-2007-GRANTED-DRAWINGS.pdf

8-KOL-2007-GRANTED-FORM 1.pdf

8-KOL-2007-GRANTED-FORM 2.pdf

8-KOL-2007-GRANTED-LETTER PATENT.pdf

8-KOL-2007-GRANTED-SPECIFICATION.pdf

8-KOL-2007-OTHERS.pdf

8-KOL-2007-REPLY TO EXAMINATION REPORT.pdf

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Patent Number

250420

Indian Patent Application Number

8/KOL/2007

PG Journal Number

01/2012

Publication Date

06-Jan-2012

Grant Date

03-Jan-2012

Date of Filing

02-Jan-2007

Name of Patentee

BHARAT HEAVY ELECTRICALS LIMITED

Applicant Address

REGIONAL OPERATIONS DIVISION (ROD), PLOT NO:9/1, DJBLOCK 3rd FLOOR, KARUNAMOYEE, SALT LAKE CITY, KOLKATA - 700091 having its Registered Office at BHEL HOUSE, SIRI FORT, NEW DELHI - 110049, INDIA

Inventors:

#	Inventor's Name	Inventor's Address
1	PERUMAL PARI	BAHRAT HEAVY ELECTRICALS LIMITED (A GOVERNMENT OF INDIA UNDERTAKING), HPBP TIRUCHY-620014, TAMIL NADU, INDIA
2	SRINIVASAN SUNDARARAJAN	BHARAT HEAVY ELECTRICALS LIMITED (A Government of India Undertaking), HPBP, TIRUCHY-620014

PCT International Classification Number

F02C6/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA