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Anonymous Poster

Charcoal As A Byproduct From Intermediate Temperature Power Plants

01/29/2011 1:20 PM

At first it seems counter productive to deliberately go to lower temperatures and lower overall thermodynamic efficiencies but a charcoal process could be designed to heat a boiler or evaporator in a low to intermediate temperature power plant.

The lower temps would allow for lower cost materials, designs and construction. A Rankine cycle has a good Carnot efficiency at low delta Ts so the overall efficiency mught not be too bad.

Since part of the purpose of the plant is to sequester carbon it isn't all that important to tweak fuel efficiency with the high temp. super heat cycle common at coal fired plants.

The government would then buy the charcoal, mix it with a trace taggent to prevent reselling fraud, and then sell it as a soil amendment, to clean up ground water leaching from toxic sites or just dump it in a landfill to sequester the carbon.

The charcoal stacks could be used as fuel in emergencies or if AGW somehow reverses.

A "Cash for Charcoal" program would create an incentive to gene splice some highly efficient fast growing bio fuel that could be grown in sea water.

The more grid energy you use the more carbon you sequester for a sustainable high economic growth rate.

Who says thermo is the dismal science?

Bret Cahill

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Power-User

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#1

Re: Charcoal As A Byproduct From Intermediate Temperature Power Plants

01/29/2011 10:48 PM

Fuel acquisition and disposal costs? Dioxin pollution from low stack temps?

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Anonymous Poster
#4
In reply to #1

Re: Charcoal As A Byproduct From Intermediate Temperature Power Plants

01/30/2011 11:34 AM

Dry cellulosic fuel shouldn't have significantly greater harvesting and transportation costs than "cellulosic ethanol" which never seems to get past the research stage.

To be sure people pay a premium for liquid fuel because of it's high energy density and ability to work in cheap high power density engines. Also, depending on the economics of cap and trade, a majority of the fuel may end up as charcoal but that may be offset by much lower cultivation costs.

Hay costs about the same as diesel on a BTU basis but without nutritional and other restrictions some plant that can be irrigated with or grown in sea water and then converted to charcoal would be the most cost effective solution to carbon abatement.

Maybe the thread title should read, Electricity As a Byproduct of Charcoal Production

Bret Cahill

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Power-User

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#2

Re: Charcoal As A Byproduct From Intermediate Temperature Power Plants

01/30/2011 2:11 AM

Please do not mix the monetary system created by man with the living system called Earth. And by the way, this carbon capture thing is a nonsense and a waste of time. Better for us is to addapt to the changes. That would be "money well spent", if I may use this expression.

The solution is to consume less, and get a bycicle. The large number in population is thanks to the concentrated energy of oil. When it will finish we'll see a reduction in population; these are the nature rules.

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Power-User

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#3

Re: Charcoal As A Byproduct From Intermediate Temperature Power Plants

01/30/2011 10:44 AM

I did never expect to hear such a thing in my lifetime!.

In Spain, just after the Civil War the conditions were awful.

There was no fuel for Winter Heating and the people used charcoal dust to be burned in copper pans kept burning slowly during the whole day under the tables.

The system is an extremely low energy way to keep pèople comfortably hot.

But the dust fuel, obtained from partial burning of Oak-trees, was very expensive.

At the time, we had a glue factory energized by a large steam boiler.

I made a special High Temperature reverberation furnace joined to the boiler by a short insulated duct.

In this furnace, we burned at high temperatures, not Oak.wood but dryed olive cores (An useless agricultural residue).

The boiler worked at a high efficiency and the result from the furnace was a high quality charcoal powder.

I bragged that we had the only Factory in the World where the fuel had a negative value. The factory made more money with the spent fuel than wiith the produced glue.

That is; Its value was much higher after using it in an industrial boiler.

But these were exceptional times.

It is strange that the system gets revived. BTW, The charcoal producing precombustion can be made at high temperatures using my reverberating furnace

Chorete

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Anonymous Poster
#5
In reply to #3

Re: Charcoal As A Byproduct From Intermediate Temperature Power Plants

01/30/2011 12:25 PM

India has coal but no petroleum. To save money on diesel GE tried adding pulverized coal and injecting the slurry into their locomotive engines.

They never got it to really work. An ex GE engineer said they tried 20 additives to keep it in suspension but the coal always kept separating out.

The coal-slurry mixture seemed to work at steam power plants back during the '70s, probably because the larger fuel lines.

It would be interesting to try charcoal dust.

Bret Cahill

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#8
In reply to #3

Re: Charcoal As A Byproduct From Intermediate Temperature Power Plants

01/30/2011 6:34 PM

What is a reverberating furnace? I used to have a corn stove. Then corn ethanol tripled the price of corn! I always thought that fruit pits would be a great option. I am starting a small orchard, so may have enough to use, in addition to tree trimming.

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#6

Re: Charcoal As A Byproduct From Intermediate Temperature Power Plants

01/30/2011 1:08 PM

Would it be more efficient to create methane (natural gas) from biomass in place, and compress it or pipe it where needed? How difficult would it be to use such fuel in farm machinery? Farm co-ops might benefit from this, as well as communities with large amounts of sewage. Long ago this was used to light towns with "town gas."

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Anonymous Poster
#7
In reply to #6

Re: Charcoal As A Byproduct From Intermediate Temperature Power Plants

01/30/2011 3:25 PM

A lot of stuff that'll burn in gasoline engines like carbon monoxide, methane, methanol, acetone, etc. is created making charcoal.

In WWII Europeans put stills in their cars and ran off the gases coming from wood chips.

It might be difficult to handle a two phase mixture of gases, however. They don't have the heat content as CNG. A lot of them might need to be consumed to generate grid power as well as charcoal.

Bret Cahill

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#9
In reply to #7

Re: Charcoal As A Byproduct From Intermediate Temperature Power Plants

01/30/2011 6:46 PM

Please explain "two phase" relative to "natural gas." Caterpillar markets large methane fueled generators. I think they mainly use gas from landfills.

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