dvawolk
Full Member
DSR2 125mm open system (actual project)
Posts: 273
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Post by dvawolk on Feb 27, 2013 7:33:59 GMT -8
Dear all! Great news!
Today i tried it with one lousy short (less than 1 metre) chimney stack (flexible aluminium duct). And it worked smokeless almost from the begining on. It got to 400°C (10cm from the top of the upper drum) in about 15 minutes. And stayed there. Max temperature reached was 440°C (at the mentioned place). At that time exhaust temperature was 250°C.
After getting to coals i loaded again and when all was burning well i removed the vertical stack.. Smoke, again. And when i put the stack back - smokeless!
I also measured the tempearture just at the bottom of insulative boards (heat riser part). The max measured temperature reached was 1000°C.
So thanks for help, problem solved. I am now on to build a provisorish masonry bell outside. In a few hours i'll post a sketch of following configuration.
Great weekend ahead!
Klemen
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dvawolk
Full Member
DSR2 125mm open system (actual project)
Posts: 273
|
Post by dvawolk on Feb 27, 2013 10:39:45 GMT -8
Here is the sketch. The first bell will be closed on top, of course. Total inner surface is about 6,9 sq. meters... First "BELL" = 3,76 sq. meters (i removed 0,4 sq. m for the burner) Second bell =3,11 sq. meters I have a feeling that there will be no problem with shortcutting of gasses in bell no. 2.?!? Do you agree? How do you think that the farthest end of the second bell will warm up?! Comments, please... Regards, Klemen Attachments:
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Post by peterberg on Feb 27, 2013 11:46:00 GMT -8
I have a feeling that there will be no problem with shortcutting of gasses in bell no. 2.?!? Do you agree? It's a distance of two feet between inlet and outlet of the bench. That should be OK. How do you think that the furthest end of the second bell will warm up?! Imagining the whole construction would be turned around, top down and bottom up. And try to see in your mind the picture of filling the whole thing with water. Then it would be logically that the lowest parts are filling up first and the exit to the chimney last. Filling with hot gases it's the other way around: the top will fill up first and to the exit last. Provided the opening between first and second bell is 1/4 or less compared to the width of the bell, bypassing won't occur. |
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Post by marko100 on Feb 28, 2013 12:30:34 GMT -8
Hello Klemen fellow countryman.
Were are you from?
Marko
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dvawolk
Full Member
DSR2 125mm open system (actual project)
Posts: 273
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Post by dvawolk on Feb 28, 2013 22:11:59 GMT -8
Hi, Marko!
From Radomlje, Domžale! You?
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Post by marko100 on Mar 1, 2013 6:50:32 GMT -8
Rimske toplice. A se sluèajno poznava iz katerega od slovenskih forumov?
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Post by peterberg on Mar 1, 2013 7:50:37 GMT -8
Gentlemen, the preferred language of this forum is English. It's not done to communicate in another langue in public. Would you please be so kind to use Croatian or Slovenian in personal messages only?
Persoonlijk vind ik het nogal storend als er ineens een paar berichten tussendoor komen waarvan ik niet kan ontdekken waar de kop of de staart zit. ;D
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Post by marko100 on Mar 1, 2013 8:33:30 GMT -8
I apologize Peter. I saw too late that there is also a private message ...
Peter have you ever tried to measure the temperature of secondary air in the p-channel? From my experience on large systems for the combustion of biomass should be heated to around 200 ° C.
I`m planing to make batch rocket in combination with a water exchanger. I might even put a rocket in a large water bell.
LP Marko
P.S.
Peter LP means greetings ;D
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Post by peterberg on Mar 1, 2013 9:14:08 GMT -8
Peter have you ever tried to measure the temperature of secondary air in the p-channel? From my experience on large systems for the combustion of biomass should be heated to around 200 ° C. In a J-tube, not the foggiest idea. But... I've measured the batch box rocket, once. At the time this 6" stove was running at its top, devouring a second batch. The temperature in the channel, very close to the exit in the port happened to be about 320 C. (608 F.). I'm inclined to think the temps could be significant higher in an 8" system. |
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Post by pinhead on Mar 1, 2013 9:14:27 GMT -8
With regards to the temperature of the secondary air flowing through P-channel, that would greatly depend on the specific design of the stove.
In my stove, for example, the entire channel is encased in sand/clay and will get hot after a good, long burn. It's only directly in contact with flame, however, at the vertical portion just above the port.
On Peterberg's stove, the P-channel is simply sitting on top of the box.
Another member - I can't seem to remember his name - has the entire bottom-side of the channel in direct contact with the flames which would increase the secondary combustion air temperature much more quickly - and to a higher overall temperature.
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Post by grizbach on Mar 1, 2013 13:48:40 GMT -8
That member would be me.
When the burn gets to the ember stage, I often have my secondary pipe glowing. It doesn't glow at the burning stage but I imagine it can get up around 700F
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Post by pinhead on Mar 1, 2013 14:01:13 GMT -8
That's right, griz, I remember now. I've looked at so many pictures of so many different stoves lately it's hard to keep 'em all straight!
Is the pipe not glowing during burning, or is it simply not glowing bright enough to see in contrast with the fire?
I'm fairly certain I've seen the entire rear 1/3rd of my stove glowing, brick-and-all. But it's hard to tell with flames in the way.
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Post by grizbach on Mar 1, 2013 14:29:29 GMT -8
You bring up a good point pin.
I have the benifit of being able to look down 95% of my pipe. There are no flames to get in my way. The incoming air will try to keep the pipe cool.
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Post by marko100 on Mar 2, 2013 8:06:17 GMT -8
Thanks peter.
200-300 C is enough.
I think that in 8" system the temp. would be the same because air volume to be preheated would increase.
One more thing Peter. Have you ever measured NOX in the exhaust gases. This is also one of the criteria in our country.
LP Marko
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Post by peterberg on Mar 2, 2013 10:34:53 GMT -8
One more thing Peter. Have you ever measured NOX in the exhaust gases. This is also one of the criteria in our country. Marko, The Testo 330-2 analyzer can be extended with a NO cell. That would mean another investment in equipment. Over here, wood stoves are regulated by CO numbers so this is what I am able to analyze. So, never measured NOx. |
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