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October 05, 2006


Greg Woulf

I wish they would have commented on the emissions produced, especially nox and co2, and the life expectancy of the SoFC.

I'd imagine that the fuel cell would be close to zero, and it sounds like it's the main producer of electricity, but I wonder how much the turbine puts out with dry exhaust.

Just the efficiency alone makes this a good thing, if it produces half the emissisions that's great.


The emmisions can be fed to algae in solar collectors. The algae uses the CO2 and NOx. then liquid fuel, biodiesel or ethanol can be made from the algae. With methane and fertilizer as further byproducts. Then the methane can power the fuel cell/turbine system, reducing fossil fuel use.

And because of the greater efficiency about half the emissions will result for the same power generation as from a conventional fossil powewr plant.

The new CeO2 sOFCs are claimed to solve the fouling problem.

I understand there is a good chance these systems could also run on powderized coal or cellulose. I like to envision local generating stations of this type that feed off the biogas from farm waste digestors, providing an additional income stream for farms.

The waste from 10 or 20 farms backing up local distributed generation from wind and solar power on homes and businesses. Clean water and great organic fertilizer to replace fossil fuel fertilizer would result as byproducts. it could save rivers, lakes, and groundwater now polluted with farm waste runnoff.


This is very interesting...

I've forwarded it to my boss - for a postgraduate course on "Energy efficiency and emerging technologies"... interesting example of what I'd term "advanced fuel cell design and use"...

The example is like a combined cycle electrochemical-thermal reactor...

My own opinion is that including some clever biomass-reforming / gasification catalysis for the feed could make this even more impressive than it already is?

Isn't it interesting how (like traditional combined-cycle power / reactor systems) ... how many separate clean technologies / green chemistries are coming together, being integrated to make ultra efficient technologies?

Paul Dietz

Correct me if I'm wrong, but doesn't pressurization also increase the current density in the fuel cell stack? This could reduce capital costs.

Some years ago I saw a design for a SOFC/CT combination that achieved 60% efficiency (don't recall if that was LHV or HHV) in a 1 MW unit. I don't know if these are on the market.

Paul Dietz

I realized these were probably the same things after I posted that. The earlier units were from Westinghouse, and had a tubular geometry. Westinghouse was based in Pittsburg, and didn't Siemens buy them a few years ago?


would like to know more about hybrid biomass power plant

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