[Gasification] Solid Fuel Gas Turbine, was Re: Where is Everyone?
Bob Stuart
bobstuart at sasktel.net
Tue Jan 3 13:39:55 CST 2017
Thanks again. This has saved me a lot of trial and error.
It sounds like I should try using plenty of air to minimize CO content,
preheated for secondary combustion, and a cyclonic separator for the
ash, probably with another filter as well, perhaps electrostatic? Air
lubricated bearings seem wise as well. The impeller case should open
with the feed door, swinging a rotary wire brush into contact with the
turbo, angled to both clean and turn it slowly. The magnet needs a
strong enclosure to handle the centrifugal force, and careful balancing.
As usual with gasifiers, price does not go down well for a
small-capacity rig, so solar may have this beat for home use now. Maybe
I've just dreamed up a good way to get forced draft on a condensing
stove using low-tech impellers. I hope someone will find this inspiring
for a larger scale unit.
Bob
On 17-01-03 12:06 PM, Doug wrote:
> Hi Bob,
>
> Coking is caused by the reversion of CO gas back to CO2 and carbon
> soot, where-by the hot gas entering the turbo is over a temperature of
> say 500C. If you were to first combust this gas with air so that only
> CO2 hot gas drove the turbo, the problem then becomes one of ash
> particle impaction onto the impeller blades. Naturally you get heaps
> of waste heat, but the practicalities of cleaning the impeller daily
> or after each refueling is a real party pooper! The only safe way is
> to use ceramic filter candles, expensive and needing compressed air to
> pulse clean.
>
> Not sure maths is all that's required to make your idea work in the
> way you perceive without adding energy. Steam and coke need the high
> temperatures and pressures associated with turbo operation, but in
> differing design application. I'm sure others will offer you comment
> to develop this interesting concept.
>
> Doug Williams.
>
>
>
> On 03/01/17 12:56, Bob Stuart wrote:
>
>> Thanks, Doug.
>>
>> I'd been worried about coking, so you have saved me a test setback.
>> Will a cyclonic separator upstream help? I've never dealt with
>> coking, so I don't even understand its vulnerabilities. Would a good
>> wire brushing with each new load of fuel do the trick? That could be
>> automated pretty easily.
>>
>> All the ICEs have to deal with the power for a compression stroke.
>> I'll do the math on intake vs exhaust volume before building, of
>> course, to make sure the turbo efficiency is a minor fraction of the
>> equations. With a built-in air pump, a condensing flue is easy to
>> arrange, and it recaptures any heat used to burn wet wood. Would the
>> steam help clean coke? It eats carbon in an ICE.
>>
>> From what I know about generators, a rapidly spinning magnet is quite
>> effective. Those little DC-DC voltage converters are surprisingly
>> small and efficient, running at very high frequencies.
>>
>> Bob
>
>
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