Purpose of ceramic blanket on bottom of combustion chamber

Al Letellier_9

The main purpose of the blanket is to create a slightly cooler spot in the bottom of the boiler to help circulation of the water in the boiler sections. At least that is what I've always been told and believe. They certainly put it there for a reason.

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Steve Garson_5

Purpose of ceramic blanket on bottom of combustion chamber

I am curious why the bottom of the combustion chamber (SGO-4) has a ceramic fiber blanket on the bottom. It seems that it would insulate the bottom of the boiler from the flame. Or does the blanket heat right up and transfer the heat? Or would the flame cool too quickly and not work properly without the blanket?

My SGO-4 has the molded ceramic chamber that the burner is aimed at, and the lining of the cast door.

Can someone explain how this works? It just seems that it would be more efficient to have the unprotected casting.

Thanks,

Steve

realolman

I can''t explain

but I think I read somewhere that the blanket reduces the carbon monoxide that would be produced without it.

I too will be interested in hearing from someone knowlegeable.

Robert O'Brien

2 reasons

1.Improved combustion
2.Prevents water in bottom of section from flashing to steam.It sounds like someone is beating on the basement floor with a hammer.

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Norm Harvey

I always thought that the insulating blanket on the bottom was to prevent flame impingement against the cast iron. If the flame were to hit the water backed cast iron surfaces directly, it would result in incomplete combustion, or a slightly sooty fire. But there are a bunch of multi-pass boilers that are chamberless. I assume that there is possibly enough clearance where there can be no impingement.

Im sure the reasons are many for why the blanket is there, I buy into almost all of them.

Unknown

It is to protect the bottom of the

boiler from excessive heat from the flame. It as all linings in chambers also allow for refractory heat transfer after the system shuts down and hold the heat in the boiler system not allowing it to dissipate and end up going out the vent. The same thing with a target wall on boilers to protect the rear sections from direct heat which in the case of some older systems build up of sludge in the bottom of the wet base boiler and with the hot flame can crack the bottom of the boiler.

All dry base boilers require a combustion chamber.

They also help to prevent flame impingement which can create aldehyde (carbon monoxide).

I personally prefer on all monoport power burners to have at least a target wall in the boiler.