Author Topic: Fuel combustion and control (Read 6325 times)

JW · « **on:** July 07, 2018, 05:44:33 PM »

This thread is about burning various renewable fuels.

I hope to post pictures. I have spent allot of effort and experimental demonstrations. The results are expected to be spectacular for its configuration. I want to take video and post on youtube. Then share how im doing it

JW · « **Reply #1 on:** July 07, 2018, 06:02:16 PM »

The technical data and methodology is like Adriaan Kragten I wasn't able to get a patent on this so I am sharing it with all.

http://flashsteam.com/corn-burners-solid-fuel-burners/

JW · « **Reply #2 on:** July 07, 2018, 10:03:32 PM »

Well my results were dismal, something wrong with the fuel support, I think it clogged. Oh well more work,,,

JW · « **Reply #3 on:** July 08, 2018, 06:22:42 PM »

Here is a link to prior experiments https://www.fieldlines.com/index.php/topic,146641.msg1042441.html#msg1042441

There is a discussion on impeller or fan stalling, I have two other blowers. One is is what I call old reliable. This is the area im currently testing.

JW · « **Reply #4 on:** July 09, 2018, 10:20:26 PM »

Well I did much better tonight than last night. The thing is you need to find just the right flow dynamics.

I reached my goal tonight and combustion was consistent optimized. So it will be easily to repeat the performance. Even a blue flame...

its working with this new fan and its much more quiet than the other impeller fan I have.

This is a remarkable stepping stone for me and my combustion control,

Bruce S · « **Reply #5 on:** July 10, 2018, 08:38:33 AM »

JW
Are you going to try using PWM to control fan speeds ?
I couldn't see the fuel flow mechanism so can't comment on it just yet.

Would be neat to be able to pulse the fuel based on heat temps .
I'd bet OperaHouse's controls for his Solar powered fridge could be modified for just such a thing.

Congrats on getting it controlled !

Bruce S

JW · « **Reply #6 on:** July 14, 2018, 05:29:49 PM »

Thanks Bruce,

I use PWM on all my fans

Here im working on my air injection manafold

Mary B · « **Reply #7 on:** July 15, 2018, 04:30:19 PM »

Seeing the air restriction you would be better off with a blower instead of a fan... fans lose the ability to push air if back pressure goes to high. Blowers will be rated for different levels of back pressure. Part of ham radio amplifier design is cooling... big transmitter tubes have a lot of air resistance and fans don't cut it. On this example your air path is through the fins and it offers pretty steep back pressure. Think the recommended blower is 120 cubic feet per minute!

JW · « **Reply #8 on:** July 15, 2018, 07:08:31 PM »

What diameter and where can I find one of those. My intake is 2.5 copper tubing fitting.

Mary B · « **Reply #9 on:** July 16, 2018, 06:27:24 PM »

What are the specs on the blower you are using now? Voltage/CFM?

I am thinking something like this will deal with the back pressure better https://www.grainger.com/product/DAYTON-Round-Permanent-Split-Capacitor-1TDN7 or the next size up etc...

JW · « **Reply #10 on:** July 16, 2018, 07:10:41 PM »

I need make a youtube video so that you get a better idea of the flow on these things.

JW · « **Reply #11 on:** July 18, 2018, 09:56:07 PM »

The blower is a ducted fan, the airflow is sufficient for the burner. In this test the injected air is not preheated like it should be.

unheated air injection test on corn burner combustion chamber
https://www.youtube.com/watch?v=gCi7gW6RfnM

Mary B · « **Reply #12 on:** July 19, 2018, 06:00:22 PM »

People heating with corn did some experiments with preheating the combustion air and found that it made no difference even with -40f intake air(heated some coming in the short 1' intake pipe into the house). I have seen my air intake pipe frost over and the stove runs fine! In fact colder air is denser so more O2 is delivered to the fire pot!

JW · « **Reply #13 on:** July 19, 2018, 06:13:24 PM »

Yes thats true for the most part, last night when I shut down the blower it took forever to completely burn all the corn in the chamber. and everything was red hot.

Im going to throw this term out there "primitive burner"

If you look close at the burner in the video you will see red ambers in the combustion stream, in the past I had heated injected air and those ambers were completely burned and this made a strong billowing flame. This topic works hand and hand with a secondary flame.

Ive seen whats possible and I am left chasing the dragon.

JW · « **Reply #14 on:** July 19, 2018, 06:24:21 PM »

Thankfully I recorded this (chasing the dragon)

This an example of burning many pounds of corn at 7000btu per hour

Jeremys Cornburner.mp4
https://www.youtube.com/watch?v=IKDSX3lMasw

Mary B · « **Reply #15 on:** July 20, 2018, 04:09:51 PM »

When using my corn stove for heating I never see red embers in the exhaust, airflow to the burn pot is lower though... base of the flame is blue, tips bright yellow/orange so getting complete combustion and about 80% efficiency according to the manufacturer. No burn pot agitation but I do have to manually remove the clinker every 12 hours. That is done via a bent rod(clinker hanger because the first were made form a coat hanger) I just lift out and dump the still burning corn back in the pot and add a new rod.

JW · « **Reply #16 on:** August 01, 2018, 08:37:16 PM »

Mary B, I think you are right about the diameter of the air injection ring being to small. I have been in contact with my machine shop guys, about the diameter but im not sure about the OD sch 40 should I go with 1.25 or 1.50 in or is there a pipe size that's available in between.

Mary B · « **Reply #17 on:** August 02, 2018, 04:38:32 PM »

Or go to compressed air injection... a small compressor would really boost combustion...

As I mentioned the problem is back pressure... you need a blower that can handle it...

Just had an idea... instead of the 6 or so air ports a corn burner pot has dozens of small holes to spread airflow out... and the air is supplied by the combustion blower PULLING from the burn chamber... typically a ~85cfm blower... here is what one looks like(in my opinion he has a bit to much air...)

https://www.youtube.com/watch?v=vrwYdBm6T3s

JW · « **Reply #18 on:** August 02, 2018, 05:25:13 PM »

I started using compressed air and the results were spectacular...

The problem is I want the burner to be mobile, a 12 volt battery is acceptable. So im working on something that uses the ducted fan. I am at this point about 70% there, but the part im working on has the possibility of good results. (air ring)

JW · « **Reply #19 on:** August 02, 2018, 06:27:04 PM »

Too answer my question, if I switch to tubing from pipe. I can get the airflow clearance I need. Nice burner BTW

JW · « **Reply #20 on:** August 24, 2018, 08:27:02 PM »

Im getting ready for final assembly, I think I have the flow problem addressed.

I plan to work on this tomorrow, using a convection section. Will update.

JW · « **Reply #21 on:** August 27, 2018, 06:08:54 PM »

Going to do a little plug. I spoke with Tom Kimmel http://www.kimmelsteam.com the other night and there having a steam meet in sept the steam auto mobile club. Im not sure I will make it. I usually set up a tent near the steam shop and spend 3 days there. Tom expressed interest in the ducted fan and how to wire one up... I have allot of interest in these type systems and they want me to do a presentation of how they work.

They also are interested in my engine animation

http://flashsteam.com/steam-engine-project-part-3/

https://steamautomobile.com:8443/ForuM/read.php?1,27539

JW · « **Reply #22 on:** November 10, 2018, 06:07:42 PM »

I got the unit outside today, took some pictures

Will see how this works, I have the history of this Hit and Miss engine then I own it now and its being converted to a 4 cycle flash steam engine. It is a well documented engine. So it will make good example for its origin to the changes made to it.

JW · « **Reply #23 on:** November 10, 2018, 06:11:01 PM »

Had to repost to insert the image

JW · « **Reply #24 on:** November 11, 2018, 08:20:47 PM »

here's a good picture of the engine when I was still developing, the engine was running at the time.

JW · « **Reply #25 on:** December 15, 2019, 03:20:39 PM »

This should be in other"

https://www.fieldlines.com/index.php?action=post;topic=149587.0;last_msg=1047423

JW
Modify message 5

JW · « **Reply #26 on:** December 15, 2019, 03:28:05 PM »

Warning - while you were reading 3 new replies have been posted. You may wish to review your post.

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Author Topic: Fuel combustion and control (Read 6325 times)