I'm having second thoughts about using a 5 minute riser again due to the possibility of ceramic fibers becoming airborne and then being inhaled. So I'll probably tear down all my cooking stoves with black ovens that use the 5 minute riser and just use fire brick instead.
Hmm, it could work with just some chicken wire (or several single wires) on the outside of the blanket in that case... but with a min order of 500kg it would be in the region of 100 tubes surely?
And the price range/kg being so large I wonder how expensive it would be even with a min order...
If the suggestion came due to the risk of airborne fibers I would suggest a biodegradable blanket instead. It is only rated for 1200C but It survived a test burn for a DSR2 core with a 1 meter chimney.
Hello, I have been working on a pizza oven with a 4" PBB that leads to a half barrel shaped oven. The dome is made out of Geopolymer (Thanks sksshel and Karl) and appears to be very strong. I wanted the system to be light enough to roll around on a cart but be large enough to make a reasonably large pizza as well as bake. I also wanted it to be able to heat up in a short amount of time. This is what it currently looks like:
As I read through this thread i realized that it is going to be hard to heat the floor of the oven. I was able to borrow a data logger and did some testing. I want to figure out the best arrangement before i mortar the dome on and and changes become more difficult. I know that i should have done different configurations starting from a cold oven but i only had the data logger for the weekend... These are the configurations i tried: -riser just entering the bottom of the oven. -extend the riser close to the top of the dome so it hits with more velocity and raps down the side.
-plate directing the flame at the floor.
-A mini dome to direct the heat down.
I placed a TC in the fire box, at the bottom of the riser, the top of the dome and the floor of the dome. As you can see, it is hard to heat the floor of the oven. (the gray trend). I kind of liked the mini dome condition because it seemed to warm the floor and the top of the dome didn't heat as hot (sort of like more heat was directed down instead of it all going up... ) My next firing I will try starting out with the mini dome and a fuller load of wood to start out. Does anyone have a recommendation on another way to heat the floor that i could try as well? I was trying to think of a ridge after the mini dome that worked sort of like a snow fence to pull the heat down but wasn't sure where to place it. I think getting the floor of the oven up to 200C should cook a pizza but i don't want it to take 2 hours. Also, the batch rocket is awesome! I over fueled it a couple times but it recovered quickly and the smoke went away. 1100C is impressive and i don't know if my K-type TCs are accurate at a much higher temp!
Thanks for the feedback Karl. I just realized that the temperature plot didn't post. I will try again.
I was sort of thinking about a set of pizza stones ~1" above the top of the riser but I figured that they wouldn't be able to handle the thermal shock. When the bottom of the riser hits 1100C the top is ~1000C. Perhaps a geopolymer plate to take the brunt of the heat and then pizza stones further away?
Yesterday I tried a firing with just the mini dome above the heat riser for the entire run. The floor got up to 200C in 40 minutes and 277C in an hour. That is a little longer than I would prefer but it also keep it's heat for a long time after the fire died down. I'm going to try pizzas tomorrow so I guess that will be the true test...
Post by Karl playing with geopolymers on Apr 29, 2020 6:38:43 GMT -8
One can use white high purity (>99%) corundum as an addition to geopolymer or fire cement to increase heat conductivity and capacity. Specific gravity 3.95–4.10 Thermal conductivity 41.9 W / (m · K) and the thermal capacity 754 J / (kg · K)
Thanks Karl, Do you have any thoughts on using cordiorite grog as a portion of the mix instead of kaolin? I have some on hand and considered experimenting with it but didn't know if it would disrupt the chemistry.
martinm: any one here with info \ experience with heat (from a mass heater) distribution with ducts throughout two storey house ?
Sept 8, 2018 22:58:52 GMT -8
padica: Good morning, this is a wonderful subject, please someone can help me with the theme of double and triple combustion, how it is achieved, theory and design, thank you
Sept 15, 2018 7:13:40 GMT -8
wiscojames: I'm afraid you won't get a response to such a vague question - I suggest reading through some of the threads related to your questions before asking for an explanation. People will be very generous with their knowledge if your question is more specific.
Sept 18, 2018 4:48:00 GMT -8
daniel: in my experience as I am working now on something of that nature, I have thought of making a heat exchanger and distributing the heat through vents using a slower fan. Now after a few years I realize that mass heaters give out primarily radiant heat, for
Nov 30, 2018 12:48:38 GMT -8
coastalrocketeer: Anyone posting in this shout box... if you have something you want people to see and respond to, create a thread in the appropriate forum section... this is not the place...
Dec 16, 2018 18:10:49 GMT -8
vesuvius: High Temperature Glass options,
Jan 4, 2019 16:28:17 GMT -8
vesuvius: Do any of you have experience with using the glass from home oven doors on a rocket stove? I'd like to have a viewing port on my stove but don't want to fork out for new ceramic glass. Any thought as to whether it would take the heat of a rocket stove?
Jan 4, 2019 16:30:40 GMT -8
yaya: you dont need the blowair for that temp..
Jan 13, 2019 16:43:57 GMT -8
flybywire: Glass window from an old washing machine is designed to take high temps. Cheap solution to your need.
Jan 27, 2019 0:10:58 GMT -8
coastalrocketeer: Anyone posting in this shout box... if you have something you want people to see and respond to, create a thread in the appropriate forum section... this is not the place to have a discussion... it is for short announcements
Feb 7, 2019 0:11:23 GMT -8
coastalrocketeer: you won’t likely get replies to questions here, and it is not a spot that makes holding an ongoing discussion possible...
Feb 7, 2019 0:12:22 GMT -8
TexasGonzo: Sooooo glad I found this site! Its always rewarding to find such a super group of folks! To any and all, feel free to PM me anytime. Thanks for having me!
Mar 11, 2019 18:56:41 GMT -8
jlmtech: GADGET: CONSIDER USING A JET PUMP INSTEAD OF A BLOWER FAN TO INDUCE DRAFT; NO CLOGGING.
Mar 26, 2019 8:19:28 GMT -8
michaelegan: i am unable to open the sketchup files on my mac. I used sketchup a few years back but apparently the company now requires a subscription. does anyone have any advice/instructions on how to use the program or how to view pictures without spending money?
Aug 20, 2019 18:41:48 GMT -8
mannytheseacow: michaelegan: download AutoCAD student version for free... import .SKP
Aug 23, 2019 13:33:44 GMT -8
topbaza: hi everyone, been searching all over net and this is were i need to be i think!!
Sept 28, 2019 6:16:25 GMT -8
anounaki: Hi, why I cant upload photos when I make new tread to this forum?
Feb 28, 2020 2:09:40 GMT -8
ahansen: photos under 1 mb not possible?
Jun 4, 2020 0:09:21 GMT -8