[Gasification] Solid Fuel Gas Turbine, was Re: Where is Everyone?

[Bob Stuart]

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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