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Hello Tom and all,
Tom asked how I replied to Harris's question.
I sent this note to him directly, which is consistent with the things you said I
think.
"The answers depend a bit on how you "pick on
words"
Your air blown gasifier is autothermic, it just uses impure oxygen
called
air. To the extent that the wood contains moisture and there is
molecularly
bound hydrogen in wood (lignin and cellulose) hydrogen and water
are
available for the water gas reaction and so some gasification."
To
me the distinctions regarding gasification regard the scale of operation.
At the small scale of gasifiers for individual tasks you find it difficult to
take advantage of things that are done commonly at a large scale.
That is operating at rather high pressures, operating temperatures that
allow you to melt the ash to glass, adding an optimum amount of steam, using
pure O2, etc. The economy of large-scale operation is very important too.
(Classes and research at Tech are consuming my time
so my replies may be limited until mid-May.)
Harry
Harry W. Parker, Ph.D., P.E.
Professor of
Chemical Engineering
& Consulting Engineer
Texas Tech
University
Lubbock, TX 79409-3121
806.742.1759 fax 742.3552
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