[Digestion] Dry fermentation in developing countries
Markus Schlattmann
firmen at schlattmann.de
Thu Oct 28 17:03:46 CDT 2010
Hi,
>>> I would venture a guess that where the inlet air is being forced in
>>> [to the batch container] by bubbling through water, and the outlet
>>> air likewise is allowed to escape by bubbling through water, then
>>> the only place in the system where there would be both a potentially
>>> explosive gas mixture and the potential of a spark would be at the
>>> evacuation point of the exiting gas mixture. Where sufficient air is
>>> blown over the water through which the evacuating air is exiting,
>>> then the risk of any explosion would, I would think, be very close
>>> to zero.
>>> The process I attempted to describe should be easy to implement
>>> whether in a situation where low cost is a primary consideration, or
>>> in a shiny packaged version for a high tech system. What have I
>>> missed here?
>
I don't know if I have understood this 100% correctly, but if you have
inlet air you will get a potentially explosive atmosphere inside the
digester. You will reach this at some point (when too low oxygen reaches
ignitable concentration). And the time this explosive atmosphere lasts
inside the digester depends on how fast you can blow the air (until
methane is diluted too much). So you will get a potentially explosive
atmosphere anyway, perhaps even longer in contrast to open the door at
once? (So methane is diluted fast?). I don't know...In both cases one
should take care of what technical equipment is used in areas with
potentially explosive mixtures (the requirements given by law also may
vary between countries).
I'm not a safety expert, but I just want to make list readers aware that
flammable atmospheres may lead to severe personal and material damage.
E.g. have a look at this (this has nothingto do with dry fermentation,
but just shows what can happen if there's a flammable atmosphere and an
ignition source):
http://feuerwehr-biberach.de/index.php?id=45&tx_ttnews%5Btt_news%5D=148&tx_ttnews%5Bbackpid%5D=1&chash=c92cb6605c
<http://feuerwehr-biberach.de/index.php?id=45&tx_ttnews%5Btt_news%5D=148&tx_ttnews%5Bbackpid%5D=1&chash=c92cb6605c>
(german again, pictures on a local fire service page, click on the
pictures to enlarge (be sure to get the full link above, if it may break
row in your mail-window))
Markus
--
Mit freundlichen Grüßen,
Markus Schlattmann
--------------------------------------
schlattmann sustainables
schlattmann.de
Dipl.-Ing. agr. Markus Schlattmann
Grünseiboldsdorfer Weg 5
85416 Langenbach
Tel.: +49 (0)8761 72162-60
Fax.: +49 (0)8761 72162-61
E-Mail: firmen at schlattmann de
Web:www.schlattmann.de
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