Design and sizing of Natural Gas line to burner of steam boiler
Design and sizing of Natural Gas line to burner of steam boiler
(OP)
Hi there.
Does anyone know if the flow of natural gas to a steam boiler should be determined by the boiler's capacity or rather by it's burner's capacity which is usually substantially bigger? Will the burner not operate at a higher capacity than that of the boiler in order to overcome losses?
Thanks.
sizgalil
Does anyone know if the flow of natural gas to a steam boiler should be determined by the boiler's capacity or rather by it's burner's capacity which is usually substantially bigger? Will the burner not operate at a higher capacity than that of the boiler in order to overcome losses?
Thanks.
sizgalil





RE: Design and sizing of Natural Gas line to burner of steam boiler
Katmar Software - AioFlo Pipe Hydraulics
http://katmarsoftware.com
"An undefined problem has an infinite number of solutions"
RE: Design and sizing of Natural Gas line to burner of steam boiler
The boilers are actually rated in steam output such as 10 ton of steam per hour. This is equivilent to about 6,500,000 kcal/hr. Now often I notice that such size boilers are equipped with a 10,000,000 kcal/hr burner. Why is this and should the gas lines be designed according to the boiler rating or the burner rating?
Thanks again.
RE: Design and sizing of Natural Gas line to burner of steam boiler
An efficency of 65% looks a little low, but will at best be 85 to 90% so gas flow in BTU/hr will always be higher than steam output. Also depnds on how the burner control system is arranged (simple on/off or a more modualting system) and how the boiler heats up. It will need a alrge heat inout during start up to start generating steam as well as the steady state heat input ot priduce the steam.
If your burners are rated at 10 million, then unless you know for sure they're never going to be run flat out, then you need to size your gas flow for 10 million.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Design and sizing of Natural Gas line to burner of steam boiler
Can't a burner much larger than a boiler burn the boiler to ashes?
RE: Design and sizing of Natural Gas line to burner of steam boiler
But that's why you install a control system and experienced vendors know how to design it properly. A 6.5 million output versus a potential 10 million input looks Ok to me. If you don't size your gas supply to the burners correctly you might not generate the steam you need or it could tske a long time to "fire up"....
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Design and sizing of Natural Gas line to burner of steam boiler
A boiler needs a burner larger than its capacity in order to overcome the efficiency of the boiler.
Wouldn’t it be necessary to also account for the burners efficiency? So that if the burner is 10 million, the gas flow should actually be let say 11 million?
RE: Design and sizing of Natural Gas line to burner of steam boiler
Maybe, depending on whether your 10 million is its rated output or input. It's not uncommon for this type of capacity to be non specific unless you ask the specific question. Usually you find someone has done it for you and given you a gas supply you need to supply...
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Design and sizing of Natural Gas line to burner of steam boiler
Thanks so much.
RE: Design and sizing of Natural Gas line to burner of steam boiler
Katmar Software - AioFlo Pipe Hydraulics
http://katmarsoftware.com
"An undefined problem has an infinite number of solutions"