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Burner tilting mechanism

Tuesday, July 24, 2018   By: pradeep [1918] 2 Stars
Dear All
I am working in Power plant having tangentially fired boiler. It got damaged. It is in the revival state. During checking burner panel elevation and burner fire angle , we found that 2 burner panels were 20mm lower than other 2 burner panels. Will it affect in proper firing condition.Will this setup make proper circles.

Regards
Pradeep

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Wednesday, July 25, 2018   By: Murphy [21] 4 Stars
I cant imagine that an elevation difference of your 2 cm or approx. 3 quarters of an inch is going to any effect on the tangential burning firing of your furnace. Murphy

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Thursday, July 26, 2018   By: Jim Watts [764] 5 Stars
In aerodynamics everything makes a difference including the size of the furnace, coal or oil firing if the odd burners are tangentially opposite or not, available adjustments etc. As you have not included any details except the measurement and it is very small I would tend to guess the same as Murphy. In this I would be relying mostly on the fact you called your question Tilting mechanism, which implies height is adjustable and would forgive even large construction errors.

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Friday, July 27, 2018   By: pradeep [1918] 2 Stars
Dear Sir
Our boiler furnace dimensions are 6.375m x 5.766m x30m height. Ours is gas fired boiler. Each burner panel has two set of burners. I am attaching picture for you to refer.
I think this may give you clearer picture.
Regards
Pradeep


KEY PLAN SHOWING LOCATION OF BURNER PANELS IN THE BOILER-Model.pdf

Click on picture for full size view or to view PDF!

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Friday, July 27, 2018   By: cmolanes@itba.edu.ar [50] 4 Stars
Mr. Pradeep:

After seeing the furnace cross section, I believe that what Mr. Murphy and Mr. Watts said about the 20 mm difference not impairing the burning process is absolutely sensible. I have seen two of these boilers in a power plant here in Buenos Aires, having worked for decades and with such furnace dimensions a small aligning height difference is meaningless.

What I consider more important is the regulation of the angle given to the burners, being as equal as possible in order to obtain a correct vortex. By the way, these are lovely boilers, a pleasure to see them firing! and the more so if they work with furnace at slightly below atmospheric pressure, and having clear view sight windows,,,,,,

Claudio Molanes

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Friday, July 27, 2018   By: Jim Watts [764] 5 Stars
Thanks for the extra information.
Gas firing means the fuel will burn readily and the swirl is just to give extra time in the furnace as radiation from the flame is lower.
You will notice burners 1 and 3 are firing to a smaller diameter circle than burners 2 and 4 and would have a different time to exit. This may even be the reason for the elevation difference.

In any case the angles are very important.

If the burners are tilting this can also change the time in the furnace and is often used to adjust superheater temperatures.

Good luck with your commissioning.

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Saturday, July 28, 2018   By: pradeep [1918] 2 Stars
Dear Sir
Thanks you all for your precious inputs. One more thing i want to ask two opposite corner burners make one circle while other two opposite burners make another circle with one circle bigger than other both being concentric. What is sigificance of it. What will happen if corners which earlier made bigger circle after adjustment make smaller circle and vice versa. But burner angles are same at all corners. I am asking this because we are facing same problem.
Please guide
Regards
Pradeep

Click on picture for full size view or to view PDF!

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Sunday, July 29, 2018   By: Jim Watts [764] 5 Stars
Your question is not clear.
Are there still two circles but the burner number to each circle has changed or is there now only one circle with all burners firing to it.?
Also what is the source of your gas and has it got stable composition.?
Also what caused your damage originally.?
Has the boiler ever had combustion Vibration.?

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Thursday, August 02, 2018   By: pradeep [1918] 2 Stars
Dea r Sir
Please find attached pdf file which give you a clearer picture of two circles which i was telling about. Boiler exploded because of gas entrapment in furnace which resulted in all water wall tubes bending and burner panels got shifted from their original position. Hope I have answered you queries.
Regards
Pradeep


31-VM-352.pdf

Click on picture for full size view or to view PDF!

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Thursday, August 02, 2018   By: pradeep [1918] 2 Stars
Dear Sir
My boiler gas source is nearby and it has stable composition always. And sir there is no combustion vibration problem. Yes there are still two circles and but the burner number to each circle has changed but how it changed no body knows. I just want to know that will it effect combustion and will it have an effect on nearby tubes like flame impingement like phenomenon
Regards
Pradeep

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Friday, August 03, 2018   By: Jim Watts [764] 5 Stars
From your picture I can see that your burners are still arranged to give fireball ok if opposite corners are fired together. It is not clear how much the diameter has changed and the space between circles. It does look smaller circle overall but it may be scale.
I do not expect you need to worry about impingement with sidewalls.
If the space for air mixing with the fuel stream has been reduced as it appears, the flame will move higher up the furnace and pockets of unburnt fuel may occur and then disappear in cycles making vibration more likely but it may not. The superheater will likely get more heat.
I am not cleaver enough to give you any guarantee of anything in this regard and even a computer simulation will not be a guarantee either.
I would be happy to try this arrangement but the trouble is that if any unusual conditions arise in the combustion, design variation will be blamed whether it is the cause or not.
It is interesting that the cause of damage was called gas entrapment. I would be very interested to know if it was other than failure to purge adequately before starting. Are you sure it will not occur again.

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Saturday, August 04, 2018   By: pradeep [1918] 2 Stars

Dear Sir
Circles got interchanged that is in drawing corners which made bigger circles after our adjustment are making smaller circle and other two corners which are supposed to make smaller circle making bigger circle may be due to slight angle deviation like 0.2 Degree to 0.3 degree because it was not possible for us to come to accurate angle setting as in drawing.
My question is that why opposite corners making 2 circles what if single circle made by all four corners. If 2 circles required that what will happen if circles get interchange as mentioned by me above.
Please guide me. And coming to your question gas entrapment is due to passing of valves after slip plates removal and that gas got into furnace that much all I can answer. In future we made provision that whenever slip plate job will done then ID and FD fans will run.
Regards
Pradeep

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Sunday, August 05, 2018   By: Jim Watts [764] 5 Stars
Two circles are required so that there is space for air and fuel to mix in opposite corner burner circle
It doesnot matter if the circle is made by the other pair.
It is important not to try firing all fout burners in the same circle as per my previous answer. Small misalignment should not matter. The flat plate around the burner nozzle pipe is a flame stabilizer and is important to have as per design, to give proper flame length.

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Wednesday, August 08, 2018   By: pradeep [1918] 2 Stars
Dear All
Thanks for your valuable advice
Regards
Pradeep

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