[Gasification] Fluidised Bed Reactor
GFWHELL at aol.com
GFWHELL at aol.com
Thu Nov 28 09:51:31 CST 2013
Kevin .
What sort of reaction could be expected if we applied the high temperature
exhaust from an IC engine into a "reactor" containing biomass and at the
same time reheated the "reactor" using some of the volatile vapors so
produced? perhaps we could also ionize the vapors produced within the reactor to
above 5000 deg. which should yield a relatively low tar stream of gas
.some of which could fuel the IC engine.
This does not compromise the laws of Thermodynamics.
GF
In a message dated 11/28/2013 9:55:19 A.M. Eastern Standard Time,
kchisholm at ca.inter.net writes:
Dear Dan
Quoting Carefreeland at aol.com:
> Doug and all,
> Would some sort of a high temp molecular cracker be a good companion
> to create a quality gas from a fluidised bed? Possibly some steam and /
or
> preheated air .involved? Seems if you wrapped the exhaust back through
the
> hottest part of the flame in a reactor tube this can be accomplished.
> Sorry but I have been kinda outta the loop for a while.
# Start by appreciating the two Fundamental Rules of Thermodynamics
and Thermo Chemistry:
Fundamental Rule #1: You can't get something for nothing
Fundamental Rule #2: As a matter of fact, you can't even break even.
For example, the reaction
C + O2 --> CO2 (`1)
is strongly exothermic, and gives off about 14,000 BTU per pound of
carbon that is oxidized.
If there was insufficient O2, and the C was only burned to CO, as follows:
C + 1/2O2 --> CO (2)
then only abut 4,000 BTU would be released per pound of carbon.
If we wanted to reverse reaction #1, we would have to put back 14,000
BTU/Lb C
OR, in the case of a gasifier, where the reaction
CO2 + C --> 2 CO (3)
is desired, we would have to "put back" energy as follows:
14,000 + 0 --> 2x4,000 + "X"
14,000 --> 8,000 + "X"
and it is obvious that "X" is 6,000 BTU, in order to respect
Fundamental Rule #1
"Molecular Crackers" and "Catalysts" do indeed work, but only when the
fundamental need to add or remove energy from a reaction is respected.
As long as the "fundamental need for an energy balance" is respected,
then many things are possible.
Best wishes,
Kevin
>
> Dan Dimiduk
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