Andrew,
There are different feeding options, as Thomas Koch and Tom Reed point out. In recent
years Thomas has made good progress on low density feedstocks for high pressure
systems. Our latest feeder is suppying a mixture of recycleable and renewable
feedstocks, including cell phones, into a gasifier with gas cleanup and power
recovery. Every gasifier developer that I know is and has been considering different
options including combinations of devices. But the feeder design or selection depends
on the feedstock, the degree of feedstock preparation and the capacity and operating
pressure of the gasifier. There is not necessarily one size that fits all. If you are
looking at low capacity, low pressure systems there are many options. Choices narrow
as as you increase pressure, capacity and system cost.
What is your specific target in terms of feedstock, type of gasifier, location of
feed, type of feedstock distribution in the reactor, size and dimensions of the
reactor, pressure, purge gas (if used) capacity, gas quality and cost? We will all
have slightly different answers to the same question.
RD&D in recent years would seem to indicate that 20MWe might be a minimum size for
IGCC power generation. Is that the scale that you are considering?
Tom Miles
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