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8 comments
Associate

Join Date: Jun 2008
Location: Gujarat
Posts: 43
Good Answers: 1

Gas turbine exhaust Insulation

08/05/2008 6:29 AM

we are in a refinery divsion and facing problems in out GT Exhaust internal insulation . The SS liners are buckled or warped over a period of time and hence the flue gas paves the way for creating hot spots in the cold face . Is there any innovative idea for replacing the conventional insulation system and implementing some new ideas to avoid the buckling .

Regards

Earnest .

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Power-User

Join Date: Mar 2007
Location: South East of Las Vegas just far enough to see the lights but far enough to not hear the coins falling
Posts: 272
Good Answers: 8
#1

Re: Gas turbine exhaust Insulation

08/05/2008 11:04 PM

From the field;

The answer is yes. I will help with the most innovative methods if you provide a couple of things.

1. Hot side max temp.

2. Cold side desired min/max temp acceptable.

3. Most importantly velocity across the inside of the exhaust.

4. Total square footage that needs protection.

A drawing would be great. No hugely important but is there any ambient temp extremes or humidity that should be considered?

Please let me know and I will help.

Miketheboilerguy@aol.com

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Guru

Join Date: May 2006
Location: Placerville, CA (38° 45N, 120° 47'W)
Posts: 3061
Good Answers: 113
#2

Re: Gas turbine exhaust Insulation

08/05/2008 11:36 PM

Mike is clearly on the right track! Are you sure it is SS? if so, what kind? (there are quite a few 'superalloys' that look like SS but have significantly lower Coefficient of Thermal Expansion) A cellular sandwich can resist buckling, but isn't cheap!

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Associate

Join Date: Jun 2008
Location: Gujarat
Posts: 43
Good Answers: 1
#6
In reply to #2

Re: Gas turbine exhaust Insulation

08/07/2008 1:12 AM

Hi mike ,

Im sure it is SS 310 . Can u explain me in detail regarding the Sandwich panels .

Regards,

Earnest

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Associate

Join Date: Apr 2007
Posts: 25
#3

Re: Gas turbine exhaust Insulation

08/06/2008 4:11 AM

Hi Earnest,

I have done some work with an innovative insulation material specialist in the past who may be able to assist. Can you give me some idea of the size/shape of the insulation panels? Is it feasible to take existing (un-distorted) panels and then have them sprayed with insulation material (say up to 8mm thick) and then to replace them in-situ? This might be one way to a solution.

Are the existing panels custom-made, or are they supplied by the GT manufacturer? I gather they are Stainless-steel, but what exact material - is it multi-layer waffle, or simple bent/formed/welded sheet steel? How are they fixed in place?

Whereabouts in the world are you situated?

John

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Associate

Join Date: Jun 2008
Location: Gujarat
Posts: 43
Good Answers: 1
#5
In reply to #3

Re: Gas turbine exhaust Insulation

08/07/2008 1:10 AM

Hi john .

This is not erected in panels for your kind information . This is like we are fixing studs in the side walls and the ceramic fibre blankets impalled on the studs and then we are fixing the SS liners with the slotted holes and then tack welding the washers locked on the SS Liners . We cant any spray any insulation material over the Ceramic blankets . Im frm india . Our gas turbine is of Frame 6 Confugiration .

Regards

Earnest .

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Associate

Join Date: Feb 2008
Posts: 45
#4

Re: Gas turbine exhaust Insulation

08/06/2008 7:21 AM

There are alot of high temperture alloys that you could use. They are mostly aerospace materials and are quite exspensive but they are extremely durable in high temperture applications.We recently purchased 1 sheet of AMS5544, .070 thick ,3' by 8' for $9500.00 for washers for a turbine assembly.

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Associate

Join Date: Jun 2008
Location: Gujarat
Posts: 43
Good Answers: 1
#7
In reply to #4

Re: Gas turbine exhaust Insulation

08/07/2008 1:14 AM

Hi ,

This is not for Turbine Assembly .This is after the Exhaust gas passing thro the Exhaust duct where the op temp is approx 546 deg c , where we have insulation on the side walls .

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Anonymous Poster
#8
In reply to #7

Re: Gas turbine exhaust Insulation

08/20/2008 9:46 AM

Gentlemen, may we help? http://www.kalbcorp.com.

Best regards,

Mike Kalb

President

Kalb Corporation

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Anonymous Poster (1); boothville (1); dkwarner (1); earnestpaul (3); miketheboilerguy (1); mtdmaker (1)

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