Thanks Toymaker. I figured Richard was making some pun from the "stress" of these calculations, not a medical judgement... but he will surely explain later.
K2
K2
Post Traumatic Stress Disorder. It's the long term feeling or fear you get when a boiler blows up and scalds your face.Sorry Richard, I am not in touch with the acronym... PTSD. Does it mean "passed the "sad" diploma"?
Or "stupid"?
Or perhaps Post Temperature-Stress Development"?
K2
I think what is meant is - - - - P= (2*T*S/D) - - - - lol (see the P. . . T . . . S . . . D ... .)Sorry Richard, I am not in touch with the acronym... PTSD. Does it mean "passed the "sad" diploma"?
Or "stupid"?
Or perhaps Post Temperature-Stress Development"?
K2
Hi Toymaker.
Sorry to dissagree with you about volume pressure and velocity of exhaust from the burner.
The air blower provides a certain volume of AIR at near atmospheric res sure at a known rate - Cubic feet per minute. But you are adding hydrocarbon fuel, which burns to provide water vapour (steam) and CO2. This is added to the nitrogen and oxygen of the air. S the mass is increased. The temperature is raised from room 20deg. C. To maybec1500deg. C.
So do some sums to determine a mass flow rate, gas volume and pressure accordingly.
It is how jet engines work.
Then you are extracting heat in the cooling coils so the final temperature has dropped - and pressure, and volume of gas - but the mass flow rate is constant.
Then you can explain how your boiler will work, or not?
Sorry to put a damper on your enthiusiasm,
But keep on.
I am sure a few of us are excited by your project.
K2
Looks just like my still.The boiler is finally starting to look like a monotube boiler.
Yes, I know my tubes are spaced much closer together than is generally recommended, however I want to try this tight pack to see how well, or not well, it works. Remember, the hot exhaust gases from the burner will be entering the boiler tube coils at the same velocity and force as air from a typical "leaf blower", because that is what I'm using to blow air into the combustion chamber.
A few specs:
All tubing is 5/8" (16mm), total length, roughly 83 ft, ( 25.4 meters). Tube surface area: 1963 sq inches.
Pot (outer shell) dimensions: 30 cm diameter by 32 cm tall.
Pressure tested to 100 psi, which is as high as my shop air compressor will go.
The burner slides into the center hole created by the tube coils.
View attachment 148224 View attachment 148226View attachment 148225
Principle similar to the ideal gas law.Hi Toymaker.
Sorry to dissagree with you about volume pressure and velocity of exhaust from the burner.
The air blower provides a certain volume of AIR at near atmospheric res sure at a known rate - Cubic feet per minute. But you are adding hydrocarbon fuel, which burns to provide water vapour (steam) and CO2. This is added to the nitrogen and oxygen of the air. S the mass is increased. The temperature is raised from room 20deg. C. To maybec1500deg. C.
So do some sums to determine a mass flow rate, gas volume and pressure accordingly.
It is how jet engines work.
Then you are extracting heat in the cooling coils so the final temperature has dropped - and pressure, and volume of gas - but the mass flow rate is constant.
Then you can explain how your boiler will work, or not?
Sorry to put a damper on your enthiusiasm,
But keep on.
I am sure a few of us are excited by your project.
K2
His comment was that as presented, this design is an accident waiting to happen.
Do you mention somehwere how thick the walls are? I must have missed that but that will tell how much strength there is.Why? Be specific.
Do you mention somehwere how thick the walls are? I must have missed that but that will tell how much strength there is.
On pressure relief safety valves.
<Snip>
Can you do that test when you first fire the boiler?
K2
Hi Toymaker,
PLEASE do an hydraulic test on your boiler coils/assembly.
<snip>
I am sure you can rig a water or oil pump to the boiler and do an Hydraulic test and check for distortion and leaks.
Then you NEED to prove your Safety Relief valve will work at not exceeding 6% over the Normal Working Pressure.... = at less than 530psi for NWP = 500psi.
Your 100psi air test is a good leak test if you have done it under water to check for leaks in any joints,
<snip>
K2
Sadly, I'm no longer in contact with any of the gas turbine designers I once worked with,...40+ years ago. I wish I were,...they'd likely get a kick from my hobby.This is "bread and butter" to jet engine designers...
K2
Sounds like an interesting career. Do tell us more.
K2
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