A plant that gasifies
coal, produces hydrogen and sequesters carbon is the Energy
Dept.'s answer to the question, "How will the United States
reduce greenhouse-gas emissions without signing the Kyoto Treaty?"
Late last month, DOE announced a $1-billion project to engineer,
procure, construct and operate the 275-Mw "FutureGen"
powerplant.
A power industry consortium will
manage the project and provide at least 20% of the costs,
say officials. The timing, the nature of the consortium and
other specifics are still undetermined. "Some kind of
government solicitation, hopefully by the end of this year,"
will set forth the consortium requirements, says Robert S.
Porter, communications director, Office of Fossil Energy.
DOE anticipates a two-stage, 10-year
program. Project definition, engineering, procurement and
construction in the first five years would be followed by
five years of operation, focusing on using the project as
a test bed for new technologies. DOE's National Energy Technology
Laboratory, Pittsburgh, Pa., has performed conceptual engineering.
Virtually every aspect of the prototype
plant would be based on cutting-edge technology, DOE officials
say. The government envisions a plant that will turn coal
into a hydrogen-rich gas, rather than burn it directly. The
hydrogen could then be combusted in a turbine, used in a fuel
cell to produce electricity or sold for industrial use. In
the future, the plant could become a model hydrogen-production
facility, making fuel for cars running on fuel cells. "We're
looking at a plant that produces multiple products,"
says Porter, rather than just electricity as in the past.
But skeptics abound. Gasifying
coal is a mainstream application in the chemicals industry,
where it is used to create feedstock for ammonia and other
chemicals and fine chemicals. But it is "still an edgy
technology" for generating electricity, notes Robert
S. Giglio, Foster Wheeler Corp. research director, Livingston,
N.J. "The most economical way to make hydrogen is methanenatural
gas." Converting energy into hydrogen costs 30% of the
energy value, he says.
Besides that, "these numbers
are bogus," complains energy consultant David Wojick,
Star Tannery, Va. "Their budget and their schedule would
be tight for a conventional coal-fired powerplant with [selective
catalytic reduction equipment] and a scrubber." FutureGen
makes no allowance for the uncertainties inherent in a research
project, he says. "This is a typical R&D guy who
has no idea how much things cost."
But FutureGen's approach is "really
a sure-fire way to have a clean plant," Giglio concedes.
"You really can't achieve zero emissions from the back
end." It is easier to eliminate the pollutants where
they are concentrated in the fuel than after they are dispersed
in flue gas, he notes.