Showing posts with label fuel. Show all posts
Showing posts with label fuel. Show all posts

Wednesday, May 20, 2015

Kelp Farming and Ice Dyking

Aaron Franklin
Kelp farming and ice dyking for habitat enhancement 
and carbon-negative fuels and chemical production.

By Aaron Franklin

A purpose-built craft like this Ground effect plane / hovercraft triphibian concept could be ideal.

The laterally-rigid sideskirts with vertically-flexible surface-contouring ski bottoms would allow transitions between air, water, ice, snow, earth surfaces of all types and the waterscoop tail could directly hose the water onto the ice with foil effect to counter lateral reaction thrust. Snow making, firefighting, and ecology seeding also in its functionality.


At pumping of 10tons per second, 50m x 100m/s = 5000sqm, 10000kg/5000sqm = 2 kg per sqm per pass. About 2mm per pass.

If we assume conditions that will allow 2 mm to freeze in 30 seconds. then 4mm per minute = 240mm per hour = 5760mm (near 6m thick) per day could be made of 50m wide by 100m/s x 30s = 3km long of icedyke by a mobile spray vehicle at 100m/s.

3000m x 6m x 50m = 900 000 tons per day of ice making.

A fleet of 50 working for 100 days therefore could make 5000 x 900 000 = 45 000 000 000 tons or near 5 cubic kilometers of ice. 

If we are looking at an average needed to ground them of say 30m thick, then 50m wide is cross section area of 1500 sqm.

5 000 000 000 cubic m / 1500 sqm = 3.33333 million meters or 3333 km.

A ball park figure of 1000kw vehicle power would seem adequate to do this.

Very likely a rope mesh reinforcement would need to be floated on the water and anchored in place to hold together the dyke that has been formed. Doing this work in polynyas seems the best way, then towing into position of sections to be anchored and further thickened.

If 100 such vehicles were used you've got near seven thousand km of icedyke which could be enough for such a layout as this:
Kelp farming, by Aaron Franklin, on background image by Shakhova et al., 2010

For methane plume hotspots to the surface, hexagonal tiles would need to be formed and towed into place, if they are too rich for ice to form inside the rings in situ.

Stationary pumping systems might have to high costs per area in most places with limits to small volumes per pump due to area feasible to distribute the water to and ice layup rates. Though in saying this, high cost is often seen as a benefit for commercial interests. They can make more money doing it the hard way.

The purposes of kelp farming in the less methane emissive areas is as follows:
  • Biomass for biofuels and biochemicals of around 500 ton per hectare per year can be harvested.
  • The growing kelp oxygenates the water to support consumption of methane and river in-flux of organic carbon.
  • The artificial kelp forests provide habitat and food for a diverse and rich ecology with fisheries and abalone/ mussel/ crabs / lobster etc farming potential
  • Unlike micro algae, the kelp biomass is easily harvested, so it would not rot and cause oxygen depletion of the water at the end of summer.
  • Sedimentation rates and water clarity are vastly improved by the kelp forests, thereby improving albedo and enhancing natural carbon burial in sediments.
  • Simple and low cost infrastructure only is neccessary to process the kelp locally into liquids for low transport costs to refineries for further upgrading.
  • It would be easy to use the CO2 from an initial biomass pyrolysis to convert methane collected nearby to methanol for easy low cost transportation.
Combining these systems would allow zero carbon emission liquid fuels via the energy component of the fossil methane and biomass being used as hydrogen and the carbon turned into biochar and high performance bioglues and recyclable polymers, allowing further long-term carbon sequestration by wood, biofibre, etc., and component for construction materials, also replacing high carbon-emission steel, concrete etc.

Friday, April 5, 2013

Klaus Lackner works on carbon capture technology

Klaus Lackner,
Columbia University
Professor Klaus Lackner, director of the Lenfest Center for Sustainable Energy at the Earth Institute, at Columbia University, is working on technology to scrub carbon dioxide from the air. “Our goal is to take a process that takes 100,000 years and compress it into 30 minutes,” says Lackner.

Direct air capture of carbon dioxide is a method that takes carbon dioxide out of ambient air, as opposed to carbon dioxide that is captured from the point of emissions, say, from the smokestack of a coal-fired power plant.

Lackner and his team are developing a device they call an air extractor, modeled after what is most abundant in nature: the leaf of a tree. There is about 0.5 liter of carbon dioxide in a cubic meter of atmosphere. When the extractor is dry, it loads itself with carbon dioxide from the air; when it's wet it releases carbon dioxide it has captured.

“We can do this at a cost of about $30 a ton of carbon dioxide”, says Lackner, “we have designed a box that can extract about a ton of carbon dioxide a day; it fits into a shipping container”. “If we had 100 million of them", Lackner adds, “we could extract more carbon dioxide out of the air then is currently put in.”

The carbon can be stored in the form of mineral carbonate rock or it can be injected deep in the ground. Alternatively, the carbon dioxide can be used, e.g. by turning it into a fuel. Airplanes will likely need to be powered by fuel for a long time, so captured carbon dioxide could be used to more sustainably produce synthetic jetfuel.

In his lab at Columbia's Engineering School, Lackner has built a small greenhouse, demonstrating that  air extractors loaded with captured carbon dioxide can be placed inside a greenhouse; the humid atmosphere inside the greenhouse will make that the carbon dioxide is released. Adding carbon dioxide to the air inside greenhouses is beneficial for plant growth; the plants will take the carbon dioxide out of the air and use it to grow.



References

- Prof. Klaus Lackner Takes Step Toward Workable Carbon Capture Technology
http://news.columbia.edu/carbondioxide

- Klaus S. Lackner, Director of the Lenfest Center for Sustainable Energy, Columbia Universityhttp://www.earth.columbia.edu/articles/view/2523

- Prof. Klaus Lackner Takes Step Toward Workable Carbon Capture Technolog . .
http://www.youtube.com/watch?v=qGL21j10C8Q

- Direct Air Capture of Atmospheric Carbon Dioxide
http://large.stanford.edu/courses/2011/ph240/mccurdy1/

- The Great Debate: CLIMATE CHANGE - Surviving The Future (1:15 to 1:24)
http://www.youtube.com/watch?v=XPaTAC29W2I

- Funding of Carbon Air Capturehttp://geo-engineering.blogspot.com/2009/05/funding-of-carbon-air-capture.html

- Removing carbon from air - Discovery Channel
http://geo-engineering.blogspot.com/2008/10/removing-carbon-from-air-discovery.html