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Rocket Stove/Watertube Boiler Hybrid?  RSS feed

 
Posts: 88
Location: North of Detroit (5b to 6a)
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It seems to me the efficiency and high heat of a rocket stove could be harnessed to create steam power. Have any attempts been made to do this?

The only theoretical drawback I see is that a series of watertubes in the secondary combustion chamber (i.e. the "rocket" part) might cool the wood gasses too much to cause ignition. If that obstacle can be overcome, I think there's great potential for making a lot of steam power in an economical manner.
 
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Chris Watson wrote:The only theoretical drawback I see is that a series of watertubes in the secondary combustion chamber (i.e. the "rocket" part) might cool the wood gasses too much to cause ignition. If that obstacle can be overcome, I think there's great potential for making a lot of steam power in an economical manner.



The coil could be placed in the barrel.
More exposed area would compensate for lower heat there.
 
Posts: 69
Location: Susquehanna, PA
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I know how you feel, I had the same idea at first. After reading many forums, listening to hours of podcasts (thanks to Paul, Ernie & Erica ) and watching many videos (good, bad or otherwise) I realized this can be done. Although a closed system is extremely dangerous. This needs to be external as to not interfere with any CSA airflow. I will be running a boiler on my RMH in a direct feed loop into the open system that is my oil fired steam boiler in an effort to make wood my primary source of heat. I am sure these sites have all the knowledge you need to make your ideas work. Listen to this http://www.richsoil.com/permaculture/782-podcast-104-rocket-mass-heaters-with-ernie-and-erica/ There is so much info here and there to cover any aspect of RMHs. No need for us to make the same mistakes others have already done for us. Oh, lets avoid the boom-squish!
 
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I have built a "combo" RMH unit that will produce steam and hot water that runs 2 separate coils, 1 around the 4" (insulated)riser, and another looped through the secondary chamber. It works quite well, except it can be a little ticklish to get "kindled up". My stack temperature has yet to exceed 80 degrees F. I have overcome the initial draft problem by the addition of a draft inducer blower, installed in such a way that it can be shut down once the secondary temp is sufficient for sustained drafting. Basically, this works just like a modern 90+% efficiency gas furnace, except it is not necessary to leave the blower in operation during firing. The coils are valved in such a way that I can use them separately or in tandem for water & steam, steam, or just water.
 
Posts: 519
Location: Wisconsin
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In for photos, I am going hydronic open to atmosphere system and not steam. I haven't worked with live steam and am not afraid of it but not about to start learning on this project. Would love to see what you came up with.
 
Roy Emerson
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: Thanks, John. If I can have your email address, I'll send you some I-phone pics. I am roy_emerson@hotmail.com. I am new to Permies, and I don't draw well. Sooner or later, I'll get out the mechanical drawing tools, and get this down in black and white.
 
If we don't do the shopping, we won't have anything for dinner. And I've invited this tiny ad:
five days of natural building (wofati and cob) and rocket cooktop oct 8-12, 2018
https://permies.com/t/92034/permaculture-projects/days-natural-building-wofati-cob
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