Secondary Air Distribution System

Secondary Air Distribution System

PostBy: Lightning On: Tue Nov 26, 2013 11:21 am

I got brave today and put 2 big holes in the face of my furnace. This is my secondary air distribution system. I used metal electrical conduit for pipes with caps in the back and compression fittings on the face. I did the math and found that 25 quarter inch holes have the same area as a 1.25 inch pipe. I made 24 quarter inch holes spaced an inch apart down each side of the pipe. Just installed it today after putting on a fresh load of coal while the furnace was cooled down. I feel a little dizzy, I might have taken on some CO working in the firebox. fhnrud bbnhh$$%*^#*#kfnd Maybe I just need some breakfast lol.. I'll post observations over the next few days.

I need everyone to put on their thinking caps. My well thought out plan didn't include a way to regulate air. What can I do for regulating secondary air on the pipes?? I have about a quarter inch of threaded pipe protruding the face of the furnace to attach something to if needed. Any ideas?

:help2:
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Last edited by Lightning on Tue Nov 26, 2013 12:08 pm, edited 1 time in total.
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: Secondary Air Distribution System

PostBy: nortcan On: Tue Nov 26, 2013 11:27 am

WOW. Very nice :idea: :idea:
nortcan
 
Stove/Furnace Make: Stuart,Peterson/ Grander
Stove/Furnace Model: Sunnyside/ Golden Bride

Re: Secondary Air Distribution System

PostBy: Lightning On: Tue Nov 26, 2013 11:38 am

OMG this awesome.. The fresh load just caught and I can see the fresh secondary air coming in thru the holes as it mixes and ignites with the volatiles.. Neat! I'll have to get some video going 8-)
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

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Re: Secondary Air Distribution System

PostBy: Lightning On: Tue Nov 26, 2013 11:42 am

My furnace over the load door is at 290 degrees. I've never seen it this high with my previous method of propping the door open a hair while burning off volatiles. Wow

More of the available oxygen is being used for sure!
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: Secondary Air Distribution System

PostBy: SMITTY On: Tue Nov 26, 2013 11:58 am

Ahh now I understand what your doing here! I was confused at first ... :lol:
SMITTY
 
Stoker Coal Boiler: Patriot Coal - custom built by Jim Dorsey
Hand Fed Coal Stove: Harman Mark III (not currently in use)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler

Re: Secondary Air Distribution System

PostBy: Sunny Boy On: Tue Nov 26, 2013 12:04 pm

Cool idea, for making it hotter !

Is it too hot at the outboard end of the pipes for plumbing ball valves ? Would be easier to see how open they are by the position of the lever type handles. 90 degrees is fully closed while handle in-line is fully open, etc.. However, there's a nylon ball seat in most that shouldn't get much over 250 degrees.

Paul
Last edited by Sunny Boy on Tue Nov 26, 2013 12:07 pm, edited 1 time in total.
Sunny Boy
 
Hand Fed Coal Boiler: Anthracite Industrial, domestic hot water heater
Baseburners & Antiques: Glenwood range 208, # 6 base heater, 2 Modern Oak 118.
Coal Size/Type: Nuts !
Other Heating: Oil &electric plenum furnace

Re: Secondary Air Distribution System

PostBy: dcrane On: Tue Nov 26, 2013 12:06 pm

wow this is great bro! where is the secondary air being pulled from?" (where do the other end of those pipes go to?).... from zero secondary air to start with, your going to notice a huge difference on temps over the firebed, it would be nice if they pulled the air from as low as possible and had variable control (some way to limit the intake). GET SOME VIDS!
dcrane
 
Hand Fed Coal Stove: Crane 404

Re: Secondary Air Distribution System

PostBy: Lightning On: Tue Nov 26, 2013 12:07 pm

SMITTY wrote:Ahh now I understand what your doing here! I was confused at first ... :lol:

Yes sir, I am attempting to distribute over the fire air evenly over the coal bed instead of it just aimlessly coming in thru the load door vents or in from the back. You can see on the pictures above a little box looking thing up high in the back of the firebox, that's where my secondary air WAS coming in..
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: Secondary Air Distribution System

PostBy: oldsch On: Tue Nov 26, 2013 12:12 pm

http://www.tractorsupply.com/en/store/s ... _vc=-10005

just an idea... would have to rig a way to hold it open
oldsch
 
Stove/Furnace Make: DSM
Stove/Furnace Model: 1400

Re: Secondary Air Distribution System

PostBy: Lightning On: Tue Nov 26, 2013 12:13 pm

dcrane wrote:wow this is great bro! where is the secondary air being pulled from?" (where do the other end of those pipes go to?).... from zero secondary air to start with, your going to notice a huge difference on temps over the firebed, it would be nice if they pulled the air from as low as possible and had variable control (some way to limit the intake). GET SOME VIDS!


Secondary air is being pulled in thru the front of the furnace.. Look at the pic above where the new pipes are mounted, one on each side of the load door. The back end of the pipes are capped. Yes, I need a way to regulate air going in thru each 1.25 inch pipe at the front. Air is being fed in about an inch or so over the top of the coal bed. 8-)
Last edited by Lightning on Tue Nov 26, 2013 12:14 pm, edited 1 time in total.
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: Secondary Air Distribution System

PostBy: Lightning On: Tue Nov 26, 2013 12:14 pm

Sunny Boy wrote:Cool idea, for making it hotter !

Is it too hot at the outboard end of the pipes for plumbing ball valves ? Would be easier to see how open they are by the position of the lever type handles. 90 degrees is fully closed while handle in-line is fully open, etc.. However, there's a nylon ball seat in most that shouldn't get much over 250 degrees.

Paul


Thanks!! I'll consider this too!
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: Secondary Air Distribution System

PostBy: Lightning On: Tue Nov 26, 2013 12:15 pm

oldsch wrote:http://www.tractorsupply.com/en/store/steel-rain-cap-for-1-1-2-in-to-1-9-16-in-outlet-pipes?cm_vc=-10005

just an idea... would have to rig a way to hold it open


Right, all ideas welcome, they may spark a solution!! Thank you :D
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: Secondary Air Distribution System

PostBy: SMITTY On: Tue Nov 26, 2013 12:16 pm

Maybe you could make a screw type adjustment similar to Harman's air intake system, only on a smaller scale?

Use a large air compressor drain valve maybe? You could adjust it with your fingers easily ... :idea:

http://www.amazon.com/s/?ie=UTF8&keywor ... 2nntygax_b
Last edited by SMITTY on Tue Nov 26, 2013 12:17 pm, edited 1 time in total.
SMITTY
 
Stoker Coal Boiler: Patriot Coal - custom built by Jim Dorsey
Hand Fed Coal Stove: Harman Mark III (not currently in use)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler

Re: Secondary Air Distribution System

PostBy: Lightning On: Tue Nov 26, 2013 12:17 pm

nortcan wrote:WOW. Very nice :idea: :idea:

Thank you Nortcan.. I hope the metal conduit can handle the heat lol.. Otherwise its back to the drawing board :lol:
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: Secondary Air Distribution System

PostBy: Sunny Boy On: Tue Nov 26, 2013 12:17 pm

Is that one inch conduit ? If so, 3/4 inch fits rather nicely inside it. You could make them into rotary sleeve valves by having 3/4 conduit inside the 1 inch.

Drill matching holes from the 1 inch into the 3/4 inch. With the 1 inch tubes fastened in place so they don't move, when the 3/4 inch tubes are turned they will start to close off the 1/4 inch holes because of the holes going out of alignment. That will restrict all the holes in the pipes equal amount at the same time. ;)

Edit, ok, I see your using 1-1/4 inch. How snug does the 1 inch fit inside it ?

Paul
Last edited by Sunny Boy on Tue Nov 26, 2013 12:19 pm, edited 2 times in total.
Sunny Boy
 
Hand Fed Coal Boiler: Anthracite Industrial, domestic hot water heater
Baseburners & Antiques: Glenwood range 208, # 6 base heater, 2 Modern Oak 118.
Coal Size/Type: Nuts !
Other Heating: Oil &electric plenum furnace

Visit Hitzer Stoves