So spent a lot of time researching gasification boilers on line then found this site to be a wealth of information in one place.
Built my first boiler thats still in use over a decade ago, then built a few for family and friends which I'll never do again as they think they came with a life time service agreement or something.
First boiler is still going strong but have decided I want something more efficient so whence the gasifier.
I found this thread that covered a lot on where to draw your water off,
http://outdoorwoodfurnaceinfo.com/forum/index.php?topic=213.0. Was wondering though if since that thread was last active if a new rule of thumb has become accepted? The ones I built I returned the water under the fire box and draw the water off halfway between the top of the firebox and the maximum water level. I seemed to get a very good mix of water in the tank according to a infrared thermometer.
But I'm wondering about any potential problems of pumping cooler water under what will be the hottest part of a gasifier if sticking to the Portage and Main style?
On the ones I built I installed a tee in the supply lines on the back of the water jacket and actually have my thermocouples in the water flow. Problem I could see with this with drawing off the bottom is the water near the top of the boiler could be near boiling then, or would it mix better with drawing the water off the bottom and returning it at the top to the opposite end by the loading door? I've also toyed with the ideal of having a high limit aqua stat near the top to override the normal control if the water was considerably hotter near the top compared to what the pump was drawing. Or even two, one to override the main control if say the water was 200-205 and a second one with a interlocking relay to kill power to the fan and damper if the water actually reached boiling until it was manually reset.
Normally I'd just play around with this and figure it out the best as possible on my own, but it looks like I'll be extremely busy all year and would like to have it done before the next heating season. So any way I could save some time is a huge plus.
Im a farmer by trade and I've picked more ground up for this year plus will have another 40 acres of hay to make this year. Also promised the wife I'd get another room remodeled this winter before I got "busy" in the spring. Happy wife, happy life.
Any help or thoughts on this would be mucho appreciated.