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#Post#: 1205--------------------------------------------------
Re: The LYNX Steam Generator
By: andywins Date: January 5, 2014, 5:36 pm
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My father and I are researching a rocket stove/boiler
combination as well. We've begun to assemble the components for
a Zero Rocket Stove:
HTML http://alt-nrg.org/images/rocket/Zero's_Rocket.pdf
HTML http://alt-nrg.org/images/rocket/Zero's_Rocket.pdf
HTML http://www.youtube.com/watch?v=q2eJec82D3I
HTML http://www.youtube.com/watch?v=q2eJec82D3I
Other than the radiative heat exchanger, we like his simple
design. Notably the use of fire brick and galvanized pipe to
fit it all together in a long-lasting configuration.
As far as steam goes, at first we were planning on using a
pressure-cooker reservoir or a large, cylindrical vessel of some
sort to satisfy some efficiency considerations presented here:
HTML http://www.rocketstove.org/images/stories/design-principles-for-wood-burning-cook-stoves.pdf
HTML http://www.rocketstove.org/images/stories/design-principles-for-wood-burning-cook-stoves.pdf
The more we look into it, the more concerned we grow regarding
safety. This is why we've started looking at monotube/flash
boiler designs. Let me thank you for uploading videos of your
design to youtube. Your project appears to be one of the most
visible as far as monotubes go.
I would be very curious to see the next iteration of your steam
solution. What are your initial plans/thoughts? If using a
rocket design, how would you integrate your boiler?
Our goal is to build an automated solution to heat/power a green
house. We'd like to automate wood pellet feeding/ignition and
use a boiler as both a water heater (heat large drums of water
to serve as a thermal battery) and power source for a steam
engine. We want our system to operate without human interaction
for a week or two before requiring more pellets/water. We plan
to accomplish this by using a MCU to orchestrate
power/temperature balance using electrical components (water
pump/solenoid+ball valves/fan with heat exchanger/glow plug
ignition/auger motor/sensors/battery bank).
#Post#: 1215--------------------------------------------------
Re: The LYNX Steam Generator
By: burnit0017 Date: January 8, 2014, 7:30 am
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Hi, nice J tube, thanks for posting.
LW, what is the max pressure output of your pump????
#Post#: 1216--------------------------------------------------
Re: The LYNX Steam Generator
By: lynx wind Date: January 8, 2014, 8:07 am
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These are 12 volt flojet or shurflow pumps designed for RVs.
They can put out 50 psi or more and are demand pumps. They only
pump when pressure is needed. This type of pump would only be
suitable for engines requiring 50 psi or less.
#Post#: 1335--------------------------------------------------
Re: The LYNX Steam Generator
By: andywins Date: January 26, 2014, 3:29 pm
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LW, did you use a rule-of-thumb when deciding the copper tubing
length and gauge?
As you mentioned, I'll make sure to move the water jacket into
the center as coils. Thanks for the tip.
#Post#: 1336--------------------------------------------------
Re: The LYNX Steam Generator
By: lynx wind Date: January 26, 2014, 3:57 pm
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The formula comes from the type of fuel and it's btu content. I
planned this for wood and pellets etc... Liquid fuels are much
higher in btu content. From there you find the heating area you
need for the HP you plan on. You also find the sqft of
combustion chamber necessary for the Lbs of fuel required per
Lbs of steam required for the type engine. In this case a
simple double acting steam engine needs about 16-20 lbs of steam
per hour per HP. So a 1/4 hp engine will need 4-5 lbs of steam
per hour (about a half gallon of water). How many btus does it
take to turn 4-5 lbs of water to steam at 50 psi and 375 F per
hour. That's the fuel rate.
If this were a liquid fueled boiler it would be much smaller.
The tubing is sized for the velocity needed for the designed
steam pressure. And then there is some discussion as to how
important it is to increase tubing size from the preheat to the
steam zone. If this were a wide range power demand setup as in
a car or boat that may be important, but for steady power the
sizing isn't as critical. I think 1/4-5/16" is fine for this
small engine.
Smaller tubing has larger surface area. Larger tubing has more
capacity and reserve.
Then there is the issue of gap between tubing sections to allow
for the optimal heat absorption and highest hot gas velocity.
#Post#: 1344--------------------------------------------------
Re: The LYNX Steam Generator
By: burnit0017 Date: January 28, 2014, 10:27 am
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HTML http://www.youtube.com/watch?v=29PZda_P8c8
Hi, interesting video of a rocket stove method for long burn
time. May spark some ideas. Hope everyone is warm and safe.
#Post#: 1346--------------------------------------------------
Re: The LYNX Steam Generator
By: crazyguy Date: January 28, 2014, 10:54 am
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what keeps all the pellets in the tube from burning?
#Post#: 1347--------------------------------------------------
Re: The LYNX Steam Generator
By: burnit0017 Date: January 28, 2014, 12:45 pm
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Hi, I did a similar project a few years ago. I think the air
flow has a lot to do with it, the fire is small, and there is
double walled pipe for the feed tube.
#Post#: 1349--------------------------------------------------
Re: The LYNX Steam Generator
By: burnit0017 Date: January 28, 2014, 4:21 pm
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HTML http://www.youtube.com/watch?v=UBWSNjvO4cc
Hi, here is J tube rocket stove with a nice ash clean out
feature. Looks like it would work well with a mono tube boiler.
#Post#: 1350--------------------------------------------------
Re: The LYNX Steam Generator
By: crazyguy Date: January 28, 2014, 4:37 pm
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I dont get two things :
1. why no smoke.?
2. why doesn 't the fire draft up the feed tube.?
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