Go Back   Forno Bravo Forum: The Wood-Fired Oven Community > Oven Management > Firing Your Oven

Like Tree3Likes

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-06-2014, 10:27 PM
Serf
 
Join Date: Oct 2010
Location: San Diego
Posts: 4
Default Smoke Abatement Solution

My neighbor complained about the smoke from my WFO. I probably would have done the same in his shoes. Bribes of baked goods were ineffectual so I was forced to find a way to reduce the amount of smoke emitted by my oven, particularly during the first 60 min of warm up. I searched the internet and explored wood fired oven and baking forums but could not find a proven, residential solution.

Commercial systems use water to knock the smoke out of the exhaust, so I decided to emulate these in a scaled down fashion. My design uses the parts listed below to construct a mister on a stick that I can insert into the top of the chimney just beneath the rain cap. The first test was extremely encouraging. The WFO produced a small fraction of the smoke that it usually does, no more than 10% of the normal amount, perhaps less. The smoke that did escape dissipated very quickly and was invisible just over the fence line - about 10-15 feet.

During usage, the exhaust maintained a positive draw and the measured exhaust temperature did not exceed 200F. A metal tub was positioned beneath the chimney on the landing to catch any drips and drops that ran down the inside of the chimney, This is a .5 GPH nozzle so very little water reaches the bottom and once the tub heats up, it boils off any drops that reach it so there is no sooty water to deal with.

I ran the mister for about an hour and disconnected it just before the last bit of soot had burned off the dome. Im very excited about these results and look forward to additional testing. At this point, I would not change anything, though my sample size is just one and the smoke control may be affected by variables that I dont understand yet.


Mist Nozzle
Amazon.com - 10/24 Mist Nozzles -

Nozzle Thread Adapter
Amazon.com - Nozzle Thread Adapter -

Compression to Nozzle Adapter
Parker A-Lok 4FSC2N-B Brass Compression Tube Fitting, Adapter, 1/4"Tube OD x 1/8" NPT Female: Amazon.com: Industrial & Scientific

Garden Hose Valve
Amazon.com: Mintcraft GB9111A3L Garden Hose Shut-Off Valve, Brass: Patio, Lawn & Garden

Hose to Compression Adapter
LASCO 17-8381 3/4-Inch Female Garden Hose by 1/4-Inch Compression Brass Adapter - Pipe Fittings - Amazon.com

Length of copper refrigeration tubing (as needed)

Some pictures here:
WFO Smoke Suppression - Imgur

I'll provide updates as my sample size increases.
david s likes this.
Reply With Quote
  #2  
Old 05-07-2014, 01:36 AM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,885
Default Re: Smoke Abatement Solution

That's terrific. When ovens are new, or wet they smoke more. Also if you use the top down method of fire lighting you can have a pretty much smoke free firing provided your oven and wood are dry.
Reply With Quote
  #3  
Old 05-07-2014, 01:58 AM
Greenman's Avatar
Master Builder
 
Join Date: Feb 2013
Location: Bundaberg. Australia
Posts: 849
Default Re: Smoke Abatement Solution

That is an excellent result. It may be able to help others with smoke problems as well.

The answer really is very dry wood and kindling and you will get very little smoke if you fire it up right. I don't have to worry about neighbours since they are well removed but even if I just build the usual pile with small dry stuff on the bottom grading up to larger material I only get a moderate amount of smoke for about a minute. It quickly settles down to emitting nothing more than a heat shimmer.

I guess some of us are lucky with plentiful good wood and have the luxury of having it under cover for an extended time even after it is what is considered to be dry.
__________________
Cheers ......... Steve
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Build Thread
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Build Pics
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Forno Food Pics
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #4  
Old 05-07-2014, 04:55 AM
stonecutter's Avatar
Il Pizzaiolo
 
Join Date: Jun 2007
Location: South Carolina,USA
Posts: 1,930
Default Re: Smoke Abatement Solution

That's a creative solution, but - Any water going down a flue, no matter how much, is going to have a negative effect on your chimney liner and cause damage in a relatively short time....water needs to stay out of masonry structures, not introduced into them...even if you have a SS flue, more so if you have a clay liner.

I would rethink this if I was you. Have you tried charcoal briquettes or wood charcoal..something that smokes less than even dry wood at start up? What about a propane weed torch....they are cheap and you can preheat that way with no smoke at all.

Edit: just saw that you have a ss flue.
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Current WFO build -
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


When we build, let us think that we build for ever.
John Ruskin

Last edited by stonecutter; 05-07-2014 at 06:58 AM.
Reply With Quote
  #5  
Old 05-07-2014, 07:04 AM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,143
Default Re: Smoke Abatement Solution

Page 153 Section 16 of the Residential Masonry and Chimney Handbook:

"During combustion, sulfur in the fuel will be converted to sulfur dioxide or sulfur trioxide, and hydrogen in the fuel will form water vapor. These gases will condense on cold walls of the chimney flue and react to form acids."

So adding water will make the problem worse. The solution is to keep the flue hot enough to eliminate condensation. In a house chimney this is hard to do, in an oven not so much of a problem. I would just recommend getting the flue up to temp with charcoal or a propane burner before firing the oven and injecting water.
v12spirit likes this.
Reply With Quote
  #6  
Old 05-07-2014, 08:24 AM
Master Builder
 
Join Date: Oct 2012
Location: Los Angeles
Posts: 724
Default Re: Smoke Abatement Solution

If you have problems with smoke and starting up the fire get yourself a weed burner like it was mentioned and make a draft door, the draft door will quickly start up the fire and keep it there.
__________________
Matthew 19:26. With God all things are possible.

My Build:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #7  
Old 05-07-2014, 08:43 AM
boerwarrior's Avatar
Journeyman
 
Join Date: Apr 2013
Location: Santa Rosa, CA
Posts: 450
Default Re: Smoke Abatement Solution

Last year we had a party with a bunch of people standing around near the pizza oven, and I wanted to get it fired up without 'smoking everybody out.'

What I did: I started a wood fire in my Weber barbecue far away from the pizza oven and waited until I had a big bunch of embers, which I then transferred to the oven using a metal shovel. I left the embers in the oven for a while so that both the oven and chimney were able to warm up. Only then did I add more wood to the oven. The wood instantly caught alight and the smoke was quickly exhausted up the hot chimney.

Definitely not smoke-free, but resulted in a lot less smoke than starting a cold fire directly in the oven.
v12spirit likes this.
Reply With Quote
  #8  
Old 05-07-2014, 10:59 AM
Journeyman
 
Join Date: Mar 2011
Location: Bucks County, PA
Posts: 297
Default Re: Smoke Abatement Solution

I can vouch for the weed-torch. Smoke is a result of insufficient combustion. Having that propane torch running during startup ensures that the wood is completely combusted until such time that the fire is hot enough to take over.

It is so easy to start too. I stack my wood in the entranceway, slide the stack into the center of the oven, light my weed-dragon and lay it on the oven floor and walk away. Come back in 5 min or so to smokeless blaze that can sustain itself.

Note: I store my week-dragon attached to a 20 gal propane tank under my oven. Extreme care should be taken to ensure that the tank is turned off at the source (not at the torch). The last thing you want is a slow leak in the closed area underneath your oven.....ka-boom!!!!
Reply With Quote
  #9  
Old 05-07-2014, 02:49 PM
Master Builder
 
Join Date: Oct 2012
Location: Los Angeles
Posts: 724
Default Re: Smoke Abatement Solution

FYI here is the draft door i built. Its very easy, and comes in use every time i fire the oven, whether its at the first start up or after the flames have settled down.




__________________
Matthew 19:26. With God all things are possible.

My Build:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #10  
Old 05-07-2014, 06:16 PM
deejayoh's Avatar
Il Pizzaiolo
 
Join Date: Jul 2010
Location: Seattle
Posts: 1,413
Default Re: Smoke Abatement Solution

Quote:
Originally Posted by V-wiz View Post
FYI here is the draft door i built. Its very easy, and comes in use every time i fire the oven, whether its at the first start up or after the flames have settled down.
I think this is going to be on my summer chores list.
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
Reply

Tags
abatement, smoke, suppression

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Smoke Massimilliano Pompeii Oven Construction 26 01-07-2014 12:24 AM
Smoke exiting thermal break mrchipster Tools, Tips and Techniques 6 10-13-2011 08:12 PM
How much smoke? hulkiebear Newbie Forum 7 05-21-2009 05:20 PM
We need help; new WFO, smoke and troubles mattieandG Getting Started 35 05-18-2009 04:35 PM
Smoke Venting Dotan Design Styles, Chimneys and Finish 9 09-17-2007 02:45 AM


All times are GMT -7. The time now is 09:56 PM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
2006/10 Forno Bravo, LLC