[Gasification] questions for Tom Reed on stratified downdraft parameters

[Jeff Davis]

Dear Tom & All,



I’ve considered using an automotive A/C unit to cool the gases just before
the engine. I would think that this would remove a sizeable amount of the
moisture from the gas.

Now with the discovery of the IcyBall waste heat from the gasifier, and or
engine, could possibly be employed to cool the gas. In a simple batch mode
you would have two IcyBalls, one being recharged via the waste heat and
the second cooling the gas. Of course they would require manual exchange.
Possible a re-circulating absorption cooler could be designed for this
task?


Jeff





Tom wrote:
> The efficiency and power of engines depends in part on the temperature
> of the intake mixture, and since we have gases, it would be tempting to
> have the lowest possible input temperature to the engine.  However, as
> you point out, paper filters and baghouses rapidly collect the fog and
> can generate too high a pressure drop.
> The easiest solution is to control your input air to 60 or 70C,
> depending on input fuel moisture and accept the small loss in power
> (make up with turbo charger?).
>
> Another solution could be to cool the gas to 10C (if you have a cold
> river nearby), drop out the fog, then reheat to 15 C to keep the filters
> dry.
>
> Good subject for discussion...
>
> TOM REED               BEF
> ------------------------------------------------------------------------
>
> Jeff Davis wrote:
>> Jim wrote:
>>
>>> 6. filters:
>>> i am finding dry filters for secondary particulate filtering to not
>>> stay
>>> very dry, and generally become rather useless very quickly.  or rather,
>>> they get wet and then require huge vacuum to pull through them.  i am
>>> using
>>> shop vac paper/synthetic filters.  i am using them after a giant
>>> cooler/radiator and the gas going into the filter is very cool.  i
>>> think
>>> about 80-90deg.  i realize i could reheat partially before the filter
>>> to
>>> prevent this problem, but such isn't very attractive.  so from the
>>> experience of others out there, are dry "paper" filters generally
>>> unreasonable on gasifiers for condensate reasons?  do dry filters
>>> usually
>>> end up as some sort of sawdust, coffee or other granular filter media?
>>> are
>>> others finding the "wisdom" of wet filters after the failure of dry
>>> ones?
>>>
>>
>> Dear Jim,
>>
>>
>> Yes, dew point is a big issue with dry filters.
>>
>> You might want to give composted horse dung a try.
>>
>> Better yet, moss. It keeps it's spongyness well.
>>
>>
>>
>> Jeff



-- 
Jeff Davis

Some where 20 miles south of Lake Erie, USA