Apr 10, 2009

UCG update: Lower CO2 emissions compared to NGCC

World Coal ($ubscription required) has an article in their March 2009 issue [Next Generation Drilling, World Coal, v. 18(3), p.28-36] detailing an economic-engineering analysis of underground coal gasification (UCG). According to Kempka et al., producing UCG-syngas to electricity has lower CO2 emissions per unit energy produced compared to natural gas combined cycle power plants. I think this is significant because natural gas-fired power plants have almost half the CO2 emissions of a conventional pulverized coal-fired power plants. Therefore, in a high-gas price scenario, UCG might become economically as well as environmentally favorable (provided sulfur, VOC, ground water contaminant emissions are taken care of).
My previous UCG post:
Underground Coal Gasification: Keep the coal in the ground, convert it to gas

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Apr 7, 2009

"That Which Belongs To None Belongs To Every One" : Arctic Climate Change & Energy Geopolitics


Verne wrote about energy resources (coal) in the Arctic & the possibility of human-engineered climate change resulting in enhanced access to these resources. Credits


Scott Borgerson, in his article "The Great Game Moves North", in the March/April issue of Foreign Affairs notes that rapidly changing Arctic climate could has countries such as Russia, Denmark, Canada, Norway, and the U.S. coming up with plans to tap the resources of this region. I did not realize it when I read the article, but in Jules Verne's The Purchase of The North Pole (aka Topsy-Turvy (Project Gutenberg)), the same nations (except for U.K. instead of Canada, Netherlands and Sweden-Norway instead of Norway) participate in an auction organized by the North Polar Practical Association to claim ownership of the earth's surface from 84 oN to 90 oN. In this article, I will compare fact and fiction to draw some conclusions on Arctic energy geopolitics.

The quote in the title comes from "The Purchase of the North Pole". In contrast to fiction, Borgerson contends that U.S. still has to verify the U.N. Law of Sea Convention, improve cooperation with Canada and retrofit its aging icebreaker fleet. According to the USGS, the Arctic likely has 13% of the world's undiscovered oil (90 billion barrels) and 30% of the world's undiscovered gas (1670 trillion cubic feet). Whereas more than 70% of the undiscovered oil resource is estimated to occur in Arctic Alaska, Amerasia Basin, East Greenland Rift Basin, East Barents Basin and West Greenland-East Canada basins, the distribution of natural gas is more concentrated. More than 70% of undiscovered natural gas resources is estimated to occur in West Siberian Basin (Russia), East Barents Basin and Arctic Alaska (USGS factsheet, pdf). The USGS estimated that it would take 37 $/barrel to produce oil from a big (billion barrel) field. Note that the associated natural gas produced is reinjected in these calculations. The WSJ points out that:
[L]arge parts of the Arctic, especially offshore, remain unexplored.

In his article, Borgerson notes:
At the same time, Arctic countries are closely collaborating on mapping the area's seafloor, with scientists from one country frequently sailing on icebreakers of another. On the face of it, everyone seems to be getting along swimmingly.
But all of this camaraderie is at odds with the growing remilitarization of the Arctic. The region is in the midst of transforming from a frozen, sleepy backwater into a potential epicenter of world affairs. How this all plays out in the geopolitical development of the region is a story that is very much still being written.

Arguments in support of various countries' claims to portions of the Arctic can be found here. A map showing various claims in shown below. An interactive version of the map can be found at Spiegel online.

Map of Russian Arctic claims © BBC



Russian developments constitute a major portion of Borgerson's article. He notes that Russia has the largest icebreaker fleet, and that Gazprom is aggressively developing the Shtokman natural gas field, and considering potential future LNG exports to the US eastern seaboard. Interestingly, Borgerson also notes that countries without Arctic coastlines such as China, South Korea, Japan are also participating in Arctic expeditions or are involved in building icebreakers and ice-strengthened tankers.

My opinions:
There are indications that the Arctic likely contains large oil and gas resources. However, the comparatively high cost of crude production in the Arctic indicate that production would not be economical in a market with low crude prices. Additionally, developing the natural gas resource located in the Russian Arctic is likely to involve significant investments in infrastructure, either as liquefied natural gas (LNG)-carrying tankers, or floating production and offloading platforms where the gas is converted on-board to liquid fuels such as methanol. The prospect of refreezing winter seas and rough weather would make operations on oil and gas production platforms a dangerous affair by today's standards. Therefore, I would expect the shipping/tanker companies to be the initial beneficiaries of an ice-free Arctic. Projects such as the Shtokman field would benefit from seasonal ice-free shipping lanes which reduce distances to markets, both in the US as well as South-East Asia/Far East.

Unlike the events in Verne's novel, where the representatives of Britain, Sweden-Norway, Holland, Denmark and Russia agree to form a syndicate against the American-represented North Polar Practical Association, alliances over the ice-free oceans would be tenuous. Recently, Denmark and Canada held talks on the delineation of the limits of the outer continental shelf. The Russian claim over the North Pole would be evaluated by the United Nations Commission on the Limits of the Continental Shelf (CLCS) this May. It is in U.S. interests to ratify the U.N. Convention on the Law of the Sea to have a role in these discussions. Regardless of these outcomes, one fact stands clear; no diplomat or leader can dare to think in similar lines to Jacques Jansen, the Netherlands' representative to the Arctic auction in Jules Verne's novel, who scoffs at the value of the Arctic ocean:
It would be much better to buy a load of codfish than to throw one’s money into the ice-water of the North.

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Carbon dioxide Sequestration Revisited

Artist visualization of CO2 sequestration of CO2 from a coal fired power plant into brine deep below the ground

Just read an article on Chemical and Engineering News (C&EN) that Dow Chemicals and Air Products have signed separate agreements to capture and sequester CO2 emitted from coal fired power plants in US and Germany, respectively.
Dow's proposed agreement is with Alstom for a pilot plant to be built at South Charleston W.Va. They are proposing about 1800 tons/yr of CO2 capture from the flue gases of a coal fired boiler. The removal technology here is an amine based CO2 removal post capture method.
The Air Products project is Germany is with the Swedish utility company Vattenfall AB. Sequestration options are being explored currently. More details can be found in the source article [Link]. New findings in the the sequestration of CO2 indicate that substantial amount of underground CO2 may remain dissolved in deep formation brine, rather than getting fixed into mineral carbonates, as previously believed.
Sources
C&EN
Nature

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Mar 31, 2009

Geo-Engineering & Irreversible Climate Change


Will Geo-Engineering Get Us Out of a Potential One-Way Street?


Coming on the heels of the Lohafex study which found that iron fertilization in the Southern Ocean did not fix significant amounts of carbon, this article from Foreign Affairs ($ubscription required, full text article available from the lead-author's website) is interesting. The idea is that even if all CO2 emissions were stopped, it would be a long time before the atmospheric CO2 concentrations decrease to pre-industrial levels. The authors advocate that geo-engineering is to be taken seriously, even if we do not end up deploying it. The article notes that options such as albedo enhancers (increasing the amount of solar energy reflected to outer space), iron fertilization of oceans are being touted as solutions. The authors also point out that whereas reaching a consensus on a globally-binding CO2 limiting agreement involves multilateral discussions, the geoengineering option on the other hand is less costly to be deployed by a single country, often without regard to other countries' interests. Because humans are already engaged in a large-scale geophysical experiment by pumping CO2 into the atmosphere, the authors note that reducing emissions would not likely suffice to prevent drastic climate change, and hence geo-engineering might become more attractive as policy makers confront this scenario.

On a related topic, in a recent paper published in the Proceedings of the National Academy of Sciences (PNAS, USA), Solomon et al. indicate that if CO2 concentrations in the atmosphere (currently at 385 ppm) peak to 450-600 ppm (despite zero CO2 emissions) and atmospheric temperatures would not drop significantly for at least a century. Irreversible dry-season rainfall reductions are one of the impacts predicted by their modeling study.

My comments:
Although geo-engineering through albedo enhancers may decrease atmospheric temperatures, it does not directly reduce the amount of CO2 in the atmosphere. Additionally, a recent study found that the use of albedo enhancers will limit the amount of sunlight available to plants. Other techniques such as iron fertilization are highly controversial, and as the Lohafex trial concluded, are likely to be only marginally beneficial. On the other hand, even if the major CO2 emitters reduce their emissions, it is likely that CO2 levels in the atmosphere will be high enough to worry policymakers in various countries to consider the extreme step of modifying the climate to fix the climate. To prepare for this eventuality, increased scientific collaboration on geo-engineering should be encouraged, so that the risks of various approaches can be evaluated.

Other articles of interest:
Tim Lenton and Nem Vaughan. The radiative forcing potential of different climate geo-engineering options. Atmospheric Chemistry and Physics Discussions, January 28, 2009

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Mar 23, 2009

Lohafex project update: Iron fertilization in Southern Ocean fixes little CO2


Some processes involved in iron fertilization of the ocean.


The BBC reports that the Lohafex project team (Loha in Hindi stands for iron) found negligible CO2 fixation upon iron fertilization in the Southern Ocean, in contrast to smaller-scale studies which indicated that the iron addition would help fix CO2 by the sinking of the dead plankton biomass.
As shown in the figure, this is a delicate balance between nutrient availability, settling rates and other creatures which consume phytoplankton. The team found that the additional plankton was consumed by microscopic animals. Additionally, the team discovered that their experiment ran into silicic acid (H4SiO4) limitations, with the result that diatoms were not the dominant species observed in the bloom.

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