kevinsatterfield

[waterbard]

[gas-mechanic]

[Bob Boyce]

[gas-mechanic]

Thanks Bob!

...so can someone explain to me why TWO bubblers is better than one, or even necessary?

How does the hydroxy remain a separate gas after it has passed through the water in a bubbler? Doesn't it 'reclaim' any of the hydrogen or oxygen from the water?

Thanks.

[Bob Boyce]

The first bubbler is the scrubber bubbler. It has fine holes to break up the gas into fine bubbles, so electrolyte vapors can be scrubbed from the gas. I like to add a pressure guage on the scrubber bubbler, and it does not have to be as strong. A check valve is used to prevent backflow into the cell stack.

The second bubbler is the safety bubbler. It has a very strong container to withstand the pressure pulse of a flashback. A check valve is used to protect the scrubber bubbler from the pressure pulse. A pop-off pressure relief can be a good addition. No pressure guage, because it would be destroyed by the pressure pulse of a flashback.

The bubbler functions can be combined into a single bubbler, but cleansing of the gas is not as good as 2 seperate functional bubblers, and no pressure guage.

Using distilled or filtered rain water in the bubblers allows the water to become replacement water for the cell stack. This assures that recaptured electrolyte from the vapor is re-applied to the cell stack and not lost. I use safety bubbler water for the scrubber bubbler, then scrubber bubbler water in the cell stack.

Any charge lost to the bubbler water from the gas would be minimal, and would only serve to energize the water more that will be used as replacement water in the cell stack.

Bob

[gas-mechanic]

Thank you, Bob.
It never ceases to amaze me how much you know about every aspect of this stuff we are working on!

I have some further questions and comments about bubblers, but due to supper being about ready, and me never missing a meal on purpose (call me anything but 'late for lunch'!!), I will do some discussion-group history reading on the subject, then start a new topic afterwards.

Have a great evening!

[AlaskaStar]

I have found that using a spring loaded check valve, and a ZERO PRESSURE system works fine. the flashback arrestor is from an oxy-acetylene torch, and the valve is spring loaded, so this means that NO PRESSURE=NO FLOW, and BACK-PRESSURE=NO FLOW. I use the engine vacuum to suck the valve open to get the hydrogen fuel. I use two, with a short hose between them that is severely weak. this hose is NOT clamped on. this allows for a "break away device" of sorts to be between the 2 flashback arrestors. the hydrogen gas is NOT under pressure, in fact it is allowed to equalize and expand in an expansion chamber to equal that of atmospheric pressure. this means that even in the even of a flash-back, AND the break-away hose blowing off, that the 2nd check valve is what will now close, and not completely stop the hydrogen gas from exiting, but at least slow it down considerably. I use a ball valve on the hydrogen supply side of the safety valves to regulate flow, and keep the engine throttles CLOSED to keep the vacuum going to allow flow, and by regulating the flow, i can effectively control engine rpm.

this is just my setup, i am not saying that any of your ideas are wrong, but up here, it gets cold, and even the garage is allowed to get down to 20 degree in winter, which is 12 degrees below the freezing mark, and it may be -60 outside, but it's better to be at -20 than -60....point is, a bubbler WILL freeze, and this said, I had to find a mechanical method of doing the same.

I do like the idea of a bubbler, because a liquid will not compress, and acts as a strong wall of movable CONCRETE for the flashback to pound against in the event of a flashback.

This is only my take, and I am glad to see Bob Boyce back up and going again.

Thanks.
AlaskaStar

[kevinsatterfield]

[mos68x]

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[MarkinAustralia]

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