Out with old, in with new.

Melt/deform in heat

 

Was thinking that after I hit the "Post" button.

Is that the primary zone where gasification / secondary combustion takes place?

 

There's gotta be a better way that using nozzle bricks, could a guy use a steel tube with holes cut in it? Looks like you would need roughly a 3*3-4*4" tube? Maybe it's a hairbrain idea and the nozzle bricks are super cheap but there's gotta be a better way. Maybe I'm biased to steel because that's my game
I know warping is a concern, but using a thicker tube would help, 3/16-3/8" wall tube should handle the heat and corrosion of the wood fire for a long long time. Certainly over a year.

 

The only boilers I've been around are Central Boilers. Not really that efficient a system.
When I build my home , I want an indoor boiler. But there's lots I need to educate myself on with them.

 

That is a very extreme environment. Like, 2000°f sand blasting. Some guys come up with their own nozzle protection or shielding ideas using steel, but those are short term & require regular replacement. Some might get a year. All depending on the boiler & configuration. Refractory cement/materials are usually more durable & cheaper to make - doesn't take long for the manufacturer to cast a few once they have the molds made. Mine (different boiler & configuration) are half way thru season 6 on originals. Showing cracks since season 1/2 but haven't displaced or eroded bad enough that I am planning a replacement yet. I've tried different materials over my holes to act as a grate to maintain a good coal bed, and none have lasted much time. There is likely something I could use that would last better but haven't stumbled on it yet. Right now I have some pieces of used s/s BBQ parts in there that I replaced with new on the Broil King in the fall. The things that take the place of briquets. They're not doing too bad actually considering the shape they were in when I put them there but are pretty well toasted now. But they aren't nozzles - just something to hold coals.

 

I have the same boiler as Gas, and had the same issues. This was last (2016-17) season and I knew I was going to replace all of my refractory this season. I built a steel plate....... 1" thick. I'll take a pic if (I remember) It does catch holy he!! around those nozzels!


Here are the new "bricks"

^^this pic is of the nozzels from the underside. The exhaust is sucked through the side tubes then down through another "heat excahnger tube then out the side into the cyclone (ash & coal separator) then up the stack.