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March 07, 2007


Scott Makowski

To liquify natural gas a large expensive facility is required taking large capital outlays and years to construct. The compressors to pressurize ng require large amounts of electrical power and the entire system requires constant upkeep and maintencance. Thermoacoustics does away with most of the normally required equipment and waste heat can be recovered by cogeneration in a organic rankine cycle electrical generators as made by Ormat. See www.lanl.gov/thermoacoustics.


Great technology! Now apply it to C02 liquefication and win the $25 million dollar Branson prize. Hope it is for real.

The additional CO2 from the natural gas combustion to make the acoustic energy can be liquefied along with CO2 from a (prefferably) fuel cell power plant.

By recovering the energy from the heat with cogeneration the whole process would be very efficient also. Heat or cool building with the waste heat, for instance.

I'll split the prize with you guys 50/50 Scott! 40/60? Hehey.

Kit P.

As Scott suggested this is very cool technology. How

Kit P.

As Scott suggested this is very cool technology. However, it appears to be at the same stage of commercial development that it was 10 years.

Thomas Marihart

I contacted 2 of the lead researchers about the status of the technology 2 years ago and it sounded like they had no more $$ to put into the development of a 20k gpd unit.

Had material issues with the extreme TA stress put on the ends of the unit and welds were subject to forming fractures.

I recall somethign about it using ~30% of the gas to run the unit (possibly a sterling engine) and the other 70% was made LNG.

The gentlemen I spoke with said that they could make it work with a willing investor...looks like they found one.

I was looking into this technology for 'on farm' use with biogas to LNG related projects.

If they can get around the design issues at a tolerable cost, I could see these things popping up just about everywhere over the next 5-10 years.

Udo Stenzel

Scott: waste heat can be recovered by cogeneration

There is no waste heat to recover here. This gadget is a hot gas machine coupled to a refrigerator, all waste heat is rejected at near ambient temperature and therefore making electricity from that would constitute a perpetuum mobile of the second kind. Of course, amazingly incompetent drx wants to build one, too...


This thing is a Stirling engine (thermoacoustic), direct-coupled to a thermoacoustic Stirling chiller.

Given the massive cost of LNG tankers, I wonder if mildly insulated ships carrying methane hydrate pellets wouldn't be a cheaper and less lossy concept.  Production of the hydrate pellets would require chilled water (even seawater) under considerable pressure, followed by chilling of the hydrate to a temperature where it is stable at atmospheric pressure.  Then it can be loaded on a ship.  The temperatures involved are relatively modest and the energy requirements would probably be much less than the 30% loss detailed here.

Peter Hunt

A Lower Cost alternative.

Convert the orphaned natural gas to methanol. Cheap, funny paper simple, easy and safe to transport . Skid mounted equipment is available and methanol is a good liquid fuel. The "Indy" cars have been running on it for years. Forget LNG for itis onlty a good way to make tanker owners rich and endanger the population.


Peter, is there an easy way to convert methane to ethanol (skid mounted equipment)?

Peter Hunt

Methanol to Ethano? Why Bother?

Why bother unless you want to drink it.If you want to go to electric power
use a fuel cell. Methanol is the fuel cell's fuel of preference. If you want
more carbon ie BTU's per gallon as an automotive fuel bump it up to butanol.

By the way methanol has a natural octane of 114 so more efficient high
compression engines could come back ( Oldsmobile Rocket with a 12:1
compression ratio) as the flame temp is below 1800 and no nitrous oxides
form. It is this octane rating that explains it's use in Indy racing.

Any problems with exhaust's while warming up are easily solved by a very
simple catalyst system. Cheaper than what gasoline requires. Raytheon's
Badger Engineering said 18 cents a gallon from prairie coal. They designed
Sasol I & II for South Africa back in the 70's

Conversion of methane to methanol is much much cheaper.

Butenol ? I don't know although it ia a polymerization it should not be too difficult.


Here is my question - forget LNG - can this technology be used to cheaply convert waste heat to refrigerant

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According to a study done by the United States Government Accountability Office, every year about 3.3 trillion cubic feet of natural gas is flared or vented — burned


to a study done by the United States Government Accountability Office, every year about 3.3 trillion cubic feet of natural gas is flared or vented — burned

レディースブーツ オークション

Any problems with exhaust's while warming up are easily solved by a very
simple catalyst system.

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