Earthware heat riser? Fireproof concrete?

A friend of mine has a tube like this

About three feet high and 1 inch thick. Some 8 to 10 inch in diameter.

Would this be big enough for a heat riser? He's got plenty of fireproof bricks and baking oven sole. He's ok to give them to me.

One question.  Can i do a rocket stove  with fireproof concrete between the bricks?


Thanks a lot guys.

Hi Everybody.

Well, could some of you give me opinions, please?

Thanks a lot.

Max.

What are you referring to as "fire proof concrete"? In my opinion anything with portland cement in it is not fire proof at the temps seen in this part of a RMH. Once portland gets to about 800-1000 F it crumbles and falls apart. If you are talking about a refractory cement which is not portland cement based, but fire clay based then it should be good.
kent

Thank Machinemaker.

I meant the stuff they joint pizza ovens with. Which, by the look of the bottom of one i've worked with long time ago, is fire clay based.

Long long time ago, i've managed to turn the bottom of the pizza oven i was working on, red

The problem I see with heat risers like this, is that it takes longer for the riser area to heat up. If you make the burn tunnel out of the clay tube then you have the same problem there.

In the stove pipe system, the fire reaction heats the thin metal - then contacts the insulation and the heat is 'trapped' right there in the burn tube and heat riser <--- This is the reason the rockets burn so clean.

In the clay tube the fire has to heat the mass of the clay before it contacts the insulation... This might make the burn not so efficient for several minutes. That being said,.. I have purchased some flu liners to use for the my next rocket project. The flu liner is made of the same material as that tube (I think). The flu liner should last almost forever (unless I crack it somehow).

In the last pic, I saw, of Ernie and Erica's RMH, I see that they used the flu liner for the load chamber. I haven't heard how much of the system is made from the flu liner.  There may be some info on their site.

http://www.ErnieAndErica.info

Thanks Ronie.

Well, checked, it's the feed which is lined with ceramic flue liner.

Ok, tube i can get is ceramic too. You know, i've been speaking english for a long time, but i'm not a native speaker. Started to learn when i was six. (many many years ago)

When i say earthware, it's ceramic you use in potery. Which is tyhe same stuff. I'll give up on that pipe for the moment. I've fitted my 4" cyclonic rocket in the workshop, works nearly a treat, but for 1500sqft it's way too small. And i think it smokes a bit too. I don't want to build a fire brick one. Too heavy. I have thoses big 35kg gaz botles which are 12 inch, by about 4 feet long. I can have pretty much as many as i want. So this might be my next system. Mind you, i don't have the right flue. I only have a stove 4 inch one in the wall. Damnit! Actualy i don't know where i'm heading.

Nevermind. Thanks a lot for the reply.

Max.

Satamax wrote:
I've fitted my 4" cyclonic rocket in the workshop, works nearly a treat, but for 1500sqft it's way too small.

4in is a bit small. 6 in. has twice the CSA as 4in.... if the 4in. pipe you find is of the snap together kind, and you can unsnap it... put two of them together for 8in pipe...

The ceramic pipe recommended is made from clay with lots of insulation mix into it... meaning hand made. There are recipes on the web for this mix (more than one) if you want to do that.  I have seen rocket stoves for cooking made of flue... it does work, but the clay has got to take heat away from things... the question is whether more heat is being added fast enough. Most masonry heaters use brick for their throat (where secondary combustion takes place) and they seem to work... but that throat is 4x18 or so and they burn the wood faster. The only sure way to find out is make one... if your pipe is 10 in. ID, it would be possible to use it as a form to put insulated clay inside of.

Hi Len.

Thanks a lot for the replies.

So, my cyclonic rocket is too small for my workshop. Plus i've experienced smokeback big time today. The wind was going into the chimney under the roof.  And i don't know where i'm heading.

The problem is i have only a 4 inch pipe going into the chimney.  With a 2 feet thick stone wall.

I'd love to use a rocket, as they seem eficient. But i might end up with a deom turbo stove.