limjunying

Posts Tagged ‘CCS’

Australia: The Politics of Environment – A Brief Round-Up

In alternative energy, Australia, environment, photovoltaics, solar energy, technology on May 21, 2009 at 4:23 pm

Kudos to Warren McLaren, Sydney for writing this great article for treehugger.com

australia drought photo

They say “a week is a long time in politics.” And this was my first thought when Matthew asked me, a month ago, to consider a round-up of business and politics events from Australia.

It may be a large sunburnt land blessed with many natural assets, but the so called Lucky Country might be using up some of its nine lives, if recent events are anything to go by. Some of the worst weather since records began suggest the climate is a changing. And not just atmospherically, politically as well. Not only are international icons like the Great Barrier Reef at risk via climate change, so are one of the oldestindigenous peoples on the planet. So what should a country, which can claim the dubious distinction of being the world’s highest emitters of carbon dioxide per capita, do to improve it’s environmental footprint? We peek at a smattering of the issues below.

Renewable Energy Feed-In Tariffs

Australian feed-in tariffs photo

Photo: Peak Energy

Australia has a bit of reputation for being world class innovators, but lousy entrepreneurs. We can problem solve with great flair, but we’re not particular brilliant at bringing products to market, oftentimes selling the new technology to someone else to commercialise. This has been our experience with solar. As a staffer at one of our leading photovoltaic research universities recently told me, “We make engineers, we don’t make solar panels.”

So Australia has the technology. In many cases we invented it. We certainly have the sun. But we have just lacked the political and commercial will to forge this country into the solar dynamo it should be. One of Australia’s leading suppliers of renewable energy, Energy Matters, put its bluntly. Germany, “ … while having half the sunshine of Australia, have 200 times the solar production capacity of our country …” And they put this down to Germany having a generous feed-in tariff program.

A feed-in tariff is where the owner of a a grid connected renewable energy system, like solar, is paid a premium (usually greater than the retail price of electricity) for the energy they feed into the grid (that their electricity utility can on-sell to other users.) There are two basic types of tariffs, net and gross. Net is only paid for any energy supplied to the grid that is greater than what was used. For example, if the system generated 12 units of power, but also drew down on the grid for 10 units, then the tariff would only be paid for the 2 units that were in surplus. With a Gross Feed-In Tariff (FIT) the premium is paid for the full 12 units.

Australia has no national feed-in tariff, with some of the states only just implementing their own disparate versions in the past couple of years. At the time of writing, the Australian Capital Territory (ACT) had the most generous solar program. In this our tiniest self governing region, they offer, to those of their 340,000 residents who have grid-connected photovoltaic systems, just over 50 cents AUD (38c USD) per kilowatt hour, for up to 10kw of solar capacity. This is roughly four times the retail price of electricity, depending on the plan an ACT customer is on. The program went live for residential solar systems in March 2009.

However, according to the recently announced Western Australian budget, the ACT has been trumped by a more generous feed-in tariff of 60 cents AUD (45c USD) per kilowatt hour. This high premium will only be open to those customers who also sign up for 100% GreenPower for the energy they purchase. With these rates it has been calculated by the WA Sustainable Energy Association that a solar system could be paid off in nine years. (Most solar panels are designed to function for 20-25 years.) The most populous Australian state of New South Wales (NSW) is currently deliberating on what form of feed-in tariff it will legislate. A result is expected by June 2009. The rest of country has a mish mash of tariff, but there remains a push for a national gross feed-in tariff of 80c /kWh.

Solar Power Adoption

Australian largest rooftop solar installation photoPhoto: PV-Tech

The feed-in tariff argument has recently reached prominence, due the success that Germany and Spain have had in rolling out photovoltaic systems. But it has not been the only influencing factoring in the slow adoption of solar technologies in Australia. Being a long way from anywhere has meant panels have been expensive to import. And with a relatively small population, (only 57% that of California!) sparsely spread around the country, they have tricky to produce locally, given high wages and small economies of scale. BP Solar, the only on-shore producer of PV panels announced in December 2008 they would close their Sydney plant to concentrate on production out of Asia.

In the face of such pricing pressures, various Australian federal and state governments have, over the years, rolled out different rebates for solar panel purchases. Initially these were to assist people in remote areas, but more recently with utilities embracing grid-connect systems, rebates for photovoltaics became more pervasive. In general the federal government will pay $8,000 towards the cost of 1 kW residential solar installations. In the 2008 budget the government announced the $8,000 rebate would ‘means tested’ and only available to those households with a combined income of less than $100,000. This sent a tremor of fear through the Australian solar industry. However, they need not have worried as, inexplicably, installation applications increased in such demand that rebate processing times about doubled.

It may have been that the political debate over the changes alerted more people to the fact that rebates were available, or maybe the announcement raised concerns that the rebate was being reviewed and interested parties needed to get in quick while it was still on offer. If the latter, then their instincts were spot on, for change was coming. For as of 30 June 2009 the $8,000 is gone, replaced by a new Solar Credits scheme.

Under this new process, there is no direct cash rebate, but tradable renewable energy credits (RECs) will allocated on a sliding scale of points, depending of the carbon reduction efficiency of the installed system. RECs are already in place for the likes of solar hot water rebates, but with the new Solar Credits program their value will beartificially increased five fold.

This process has drawn flak from many quarters. Some believe it means polluters, like coal-fired power stations, buying the exchangable credits on the market, will be purchasing much cheaper credits to allow them to continue their carbon dioxide emissions,negating the efforts of the homeowner to reduce CO2 output . In pure economic terms, the RECs will not, in many instances, reward the residential householder as much as the current lump sum $8,000 rebate.

Couple these rebate changes, with the aforementioned move to gross feed-in tariffs and with the newly emerging business model of communities, co-ops and businesses bulk buying panels and inverters to bring the price down even further, and you have a mad rush of residential solar installations.

Renewable Energy Targets

Australian wind turbines bridgewater photoPhoto: Wind in the Bush

All of which goes to help the government inch closer (sounds better than ‘centimetre closer’) to their stated aim of 20% renewable energy by 2020. Back in April of this year the federal and state governments under the umbrella of the Council of Australian Governments’ (COAG) agreed to expand the existing Mandatory Renewable Energy Target (MRET) to this goal. In reality this means that nationally Australia will strive for a legislated target of 45,000 gigawatt-hours by 2020. More than four times larger than the present MRET.

This won’t just come from solar, but also the likes of wind, biomass and geothermal (aka “hot rocks”). But on the solar side of things, the government of Kevin Rudd, just this weekend past detailed one the ways the federal government will be contributing to this target.

It plans under its Clean Energy Initiative to build four solar plants, which in aggregate will amount to “largest solar energy project in the world.” As the Australian newspaper understands the Solar Flagships proposal, there will be almost $1.4 billion AUD invested in two solar thermal, and two solar photovoltaic stations with a combined output of 1000MW coming on stream by 2015.

Other government initiatives like Solar Schools and Solar Cities will also contribute towards the national MRET. As will wind power, although rolling out wind farms tends to more problematic when the NIMBY (not in my back yard) element comes into play.

Geothermal energy holds great promise as water is flushed into deep holes in the earth’s crust, to be heated by hot rocks and returning to the surface as steam, to drive turbines. Although feasible to the point it is said it could provide for all of Australia’s energy needs, it is currently experiencing some technical teething issues. But not everyone will need to make a contribution, like the big polluters, known as ”emissions-intensive, trade-exposed industry”, who’ll be largely exempt.
In the federal Budget just announced last week the government said they would invest $465 million to establish Renewables Australia to support this sort of leading edge research and make it commercial.

Emission Trading Scheme (ETS)

Australian emissions trading scheme photoPhoto: AAP / Dean Lewins from the ABC

However Australian governments aren’t having the good news stories all flow their way.

The federal Rudd Government have come under concentrated attack from green groups, and particularly the national Greens poltical party, for their 2009 budget announcement, that they’ll be funding so called ‘clean coal’ to the turn of $2.4 billion AUD, most of which will be directed a Carbon Capture and Storage Flagships program. That’s $0.4 billion more than the Solar Flagships program.

And the Victorian government has been chastised for its feed-in tariff, which will be a net system, not gross and be eligible for only up to 3.2 kW energy systems (the ACT’s is 10 kW) and will be a credit on their electricity bill, not a payment.

On the much bigger picture is the federal government’s emission trading scheme, or as they prefer to call it, the Carbon Pollution Reduction Scheme. Many believe that the Labor party was successful at the 2007 election, in part because they promised to sign the Kyoto Protocol and actually do something about climate change, unlike the previous government.

Professor Ross Garnaut, was employed to inform the Australian government on the economic impact of global warming to the country. Part of his recommendations included the establishment of an Emissions Trading Scheme (ETS). (The US has been talking around a similar idea, but using the terminology ‘cap and trade.’ In short, enterprises who want increase their emissions beyond an allowance (or cap), set by the government need to buy (trade) credits from businesses who emit less greenhouse gases.

Anyhow. acting on the Garnaut report, the government developed their version of an ETS. But up until recently they have had no joy getting anyone to like it. Malcolm Turnbull, the leader of the federal opposition party, the Liberal/National Coalition was right when he said, “It’s literally completely friendless.” Environmentalists and The Greens felt it was wishy washy, because it only strove to reduce emissions by 5% and gave a heap of ‘get out of jail’ free cards to the big emitters. The influential mining industry (Australia is the world’s largest exporter or coal) obviously are not keen on any legislation that impedes business opportunities. It was so universally disliked that it did not pass through the parliament. It didn’t look like anything was going to be place by the election promised date of 2010.

Then at the start of May 2009 the government reneged, coming out with a revised plan. They were now moving it back to 2011 and implementing a raft of compromises, like a new low price for carbon — $10 a tonne — and yet more free permits for large polluting industries. Yet these changes enabled them to drop their bombshell (the Prime Minister, Kevin Rudd, had repeatedly stated that “It would be reckless and irresponsible for our economy and for our environment,” to delay the introduction of an emissions trading scheme), supported on the day, by the Business Council of Australia, the Australian Industry Group, the Australian Chamber of Commerce and Industry, and mainstream enviro groups like the Australian Conservation Foundation, the Climate Institute and the World Wildlife Fund.

One of the concessions was that Australia would move to a 25% Greenhouse Gas reduction by by 2020. Which on the surface sounded great. But devil is always in the detail. This cut would only occur if a comprehensive global agreement on emissions reduction can be signed in Copenhagen in December 2009. Of course, the Greens are incensed at what they see as ‘smoke and mirrors.’ But the government wants some sort of scheme passed by parliament, so it can attend the United Nations Climate Change Conference in Copenhagen with at least something in its pocket, as a bargaining chip.

And There’s More?

Australian Drought Cracked Earth photo

Photo: Warren McLaren / INOV8

With all this talk of emissions trading and solar programs one could be forgiven in thinking there weren’t other environment issues stalking the corridors of Australian political office. Let’s briefly touch on just a few.

As previously noted here the state governments couldn’t agree on national campaign to rid shops and waterways of the dreaded plastic shopping bag, so South Australia went it alone. (As they many years ago, being the only state to have Container Deposit Legislation, placing a redeemable deposit on all beverage containers.)

The food bowl of Australia is the catchment of two major river, the so-called Murray-Darling basin; it is, as Reuters points out, “as large as France and Germany combined, accounts for 41 percent of Australia’s agriculture and provides A$21 billion ($13.54 billion) worth of farm exports to Asia and the Middle East. Around 70 percent of irrigated agriculture comes from the basin. And whether due to the worst drought in over a century, or the early onset of climate change the region is under some pretty severe stress.

“The drought has already wiped more than A$20 billion from the $1 trillion economy since 2002. It is the worst in 117 years of record-keeping, with 80 percent of eucalyptus trees already dead or stressed in the Murray-Darling region.”

It’s not just ecosystems at imminent risk of devastation. If the current dry conditions continue, as they are forecast to, then the South Australian capital of Adelaide may run out of water within two years. Other states have offered to sent drinking water for the city of over 1 million people, but they too draw upon the Murray river, which only has 18% of its capacity at the moment. The federal government has given the The Murray-Darling Basin Authority (MDBA) $50 million to buy back some of the seven billion litres of water from water licence holders along the catchment, who are willing to sell.

The devastating bushfires in the state of Victoria, which claimed around 170 lives and 2,000 homes, are another aspect of Australia’s dry climate. There are claims that not enough fuel reduction burns were undertaken preceding the fires, though the bush and forest is the reason many of the people live in those locations in the first place. Others believe that with the ongoing drought, there are not enough safe days in the year to undertake the scale of reduction burns needed. A Royal Commission is presently underway to determine the factors that contributed to the most deadly natural disaster in Australian history.

Before the Commission convened and on behalf of more than 13,000 firefighters and support staff, the National Secretary of United Firefighters Union of Australia sent an open letter to the Australian Prime Minister and Victorian Premie. It said, in part:

“Something is going on. As we battle blazes here in Victoria, firefighters are busy rescuing people from floods in Queensland. Without a massive turnaround in policies, aside from the tragic loss of life and property, we will be asking firefighters to put themselves at an unacceptable risk. Firefighters know that it is better to prevent an emergency than to have to rescue people from it, and we urge state and federal governments to follow scientific advice and keep firefighters and the community safe by halving the country’s greenhouse gas emissions by 2020.”

And how about this one: The ABC reports that “Tasmania’s Department of Environment, Parks, Heritage and the Arts will be shut down to help cover a looming budget black hole.”

But there is some good news. A massive amount of environmental rebates available from state and national government to help householders, landlords, schools and community groups. These cover ceiling insulation; rainwater tanks (with added incentives if these are connected up to washing machines and flushing toilets); solar hot water systems; energy and water efficient washing machines; compost bins; drip water gardening systems; grey water systemsgreen loans, and more.

And we have to stop there. For next week there’ll be a whole new set of challenges and opportunities confronting our elected representatives.

UK Govt Announces New Regulations for Carbon Capture

In environment, technology on May 6, 2009 at 11:58 pm

drax power plant photo
photo: The Writing Zone via flickr.

The UK government has announced new regulations that prohibit building any new coal power plants, if those plants don’t have carbon capture and storage incorporated into them. It sounds like at least a step in the right direction—though Cleantech points out that it’s not expected to really deter new power plants—but when you look at it isn’t nearly as large a step as it might seem:

The mandate (already in effect) says that CCS is required for at least 400 MW of output from a new coal power plant. By 2025 that would expand to 100% of a plant’s emissions. And here’s the big but… The requirement to capture all of the emissions would only be in place, provided that the technology is at a stage where it could capture all of the emissions.

Call me cynical, but that seems like a loophole big enough to drive several coal trains through. Since the financials of CCS, when deployed at the gargantuan scale required to capture all of coal’s emissions, are sketchy at best, you could easily have new coal power plants capturing only a third of their emissions (which is better than none of them, but still a blow to slowing climate change in many ways) and throwing in the proverbial towel on trying to capture more.

via: Cleantech

Carbon Capture and Storage (CCS) webcast with John Barry, VP Unconventionals, Enhanced Oil Recovery and CO2

In Uncategorized on June 17, 2008 at 2:15 pm

Just yesterday, I received an invitation to an online discussion with Shell on CCS, Enhanced Oil Recovery etc.

As a blog with a well-informed interest in the energy challenge and new technologies to reduce the impact of CO2 emissions on the environment, I hope you (and your readers) will be interested in this invitation to join Shell for an online discussion on Carbon Capture and Storage.

John Barry, Shell’s VP Unconventionals, Enhanced Oil Recovery & CO2 will be answering your questions about this technology in a live webchat on June 19 at 5pm CET (11am in NYC) athttp://www.shell.com/dialogues. If you visit the site in advance of this date you can watch a short video where he gives some useful background information on this exciting technology and Shell’s strategy.

Please take the opportunity to register now so that you can post your questions to him on June 19 and to receive reminders about this and future webcast and Q&As. Registration will take only 30 seconds.

Please do feel free to pass this message on to others who you think may like to attend this webchat, and do feel free to blog it either before or afterwards.

(I hope you don’t mind me posting this invitation as a comment – I couldn’t see an email address to contact you privately.)

Best wishes

Chris Reed
Shell Scenarios team

Click here to pre-register:

http://www.shelldialogues.com/carbon-capture-and-storage

Pre-register to have your say, opinions, ideas heard!

Personally, I’m pretty much skeptical about carbon sequestration, not as a solution to the current global warming crisis but as a high-fidelity long-term solution. Would efficient CCS leave us complacent and permit ourselves to more carbon dioxide emission? Would this “out of sight, out of minds” scenario be possible? What are the statistics for long-term viability for CCS?

However, I’m not undermining the help that CCS could bring, especially in this last hour where I foresee that climate change mitigation at the current pace is not nearly enough to prevent severe global warming. So with this perspective, CCS is arguably a great time buyer for other green policies and technologies to bring down the carbon dioxide concentrations in the air.

What are YOUR thoughts?

 

Scientists Develop Air “Scrubber” Capable of Capturing 1 ton of CO2 a Day

In Uncategorized on June 7, 2008 at 4:00 pm

Scientists of the Columbia University in New York, led by Klaus Lackner, plan to build and demonstrate a prototype within two years that could economically capture a tonne of carbon dioxide a day from the air. That’s the equivalent of the carbon output per passenger for a flight from London to New York.

The prototype “scrubber” would be small enough to fit inside a shipping container, and while  Lackner estimates it will initially cost around £100,000 to build, the carbon cost of making each device would be “small potatoes” compared with the amount each would capture.

The scientists stress their invention is not a magic bullet to solve climate change. It would take millions of the devices to soak up the world’s carbon emissions, and the CO2 trapped would still need to be disposed of (see below). But the team says the technology may be the best way to avert dangerous temperature rises, as fossil fuel use is predicted to increase sharply in coming decades despite international efforts. Climate experts at a monitoring station in Hawaii this month reported CO2 levels in the atmosphere have reached a record 387 parts per million (ppm) – 40% higher than before the industrial revolution.

The quest for a machine that could reverse the trend by “scrubbing” carbon from the air is seen as one of the greatest challenges in climate science. Richard Branson has promised $25m (£12.6m) to anyone who succeeds.

Lackner told the Guardian: “I wouldn’t write across the front page that the problem is solved, but this will help. We are in a hurry to deal with climate change and will be very hard pressed to stop the train before we get to 450ppm [CO2 in the atmosphere]. This can help stop the train.”

He added: “Our project has reached the stage where it is quite clear we can do it. We need to start dealing with all these emissions. I’d rather have a technology that allows us to use fossil fuels without destroying the planet, because people are going to use them anyway.”

Scientists have been sceptical about air capture devices for carbon because of the large amounts of energy they consume. Although it is relatively easy to find chemicals that absorb CO2, it is harder to then strip the gas from the so-called sorbent for reuse. A detailed report on carbon capture from the Intergovernmental Panel on Climate Change in 2005 effectively dismissed the air capture as unworkable.

Lackner’s team says it has made a significant breakthrough that massively reduces the amount of energy required to recharge the sorbent. It is reluctant to discuss details, but a US patent application obtained by the Guardian shows that it is based on changes in humidity.

The team says it can trap the CO2 from air on absorbent plastic sheets called ion exchange membranes, commonly used to purify water. Crucially, it has discovered that humid air can then make the membranes “exhale” their trapped CO2. The discovery was “some serendipity and some working out,” Lackner said. “When I saw it the first time, I didn’t believe it.”

The team is working to build a prototype at a laboratory in Tuscon, Arizona. Run by a company called Global Research Technologies (GRT), of which Lackner is vice president of research, the laboratory unveiled a “pre-prototype” air capture machine last year, based on a different technique -rinsing trapped CO2 off the membrane with liquid sodium carbonate, and then using electricity to liberate the CO2 from the fluid.

Lackner says that device works, but the “humidity switch” could slash the scrubber’s energy use tenfold. He said: “We can do it coming out carbon positive.”

The team is also working on ways to dispose of the pure CO2 gas produced by each scrubber.

The patent suggests the scrubber could be connected to greenhouses, where the CO2 would boost plant growth. Or the gas could be used to grow algae, for food, fertiliser or fuel. The latter could “close the carbon loop,” Lackner said.

The discovery could make the team eligible for the $25m Virgin Earth Challenge, which has pledged the money to the inventor of a way to remove a billion tonnes of CO2 from the atmosphere each year, though Lackner said he had not contacted Branson.

Wallace Broecker, the distinguished environmental scientist at Columbia University who helped Lackner set up GRT, said the air scrubber could be only way to tackle climate change.

He said Lackner was “one of the smartest guys on the planet”. Broecker introduced the late Gary Comer, a billionaire entrepreneur, to Lackner and Allen Wright, an engineer who runs GRT, helped by his brother Burt. Broecker said that the Wright brothers helped to cause this problem and “now the Wright brothers are going to fix it”.

Source:

David Adam, “Could US scientist’s ‘CO2 catcher’ help to slow warming?”, The Guardian, 31st May 2008

See Also:

Carbon Storage (A Complementary Add-on to the Air Scrubber) Carbon Sequestration and Storage in Soils Could Solve Global Warming

Other Alternatives to the Same Problem: Scientists Develop Low-Cost Version of CCS (Carbon Capture & Storage)

Carbon Sequestration and Storage in Soils Could Solve Global Warming

In Uncategorized on May 24, 2008 at 11:31 pm

by Christine Lepisto, Berlin on 05.17.08 for Treehugger.com

Carbon-capture-in-soil.jpg

Soils contain more than twice as much carbon as the atmosphere according to estimates (Food and Agriculture Association of the United Nations, FAO). Increasing the amount of carbon naturally stored in soils could provide the short-term bridge to reduce the impacts of increasing carbon emissions until low-carbon and sustainable technologies can be implemented. A group called Soil Carbon, based in Australia, makes the case for soil carbon storage in a presentation available in English, German, Spanish, Italian, Mexican and Portuguese. The Soil Carbon report includes impressive photographs, such as those above, demonstrating the difference between well-managed and poorly managed soils.

The Soil Carbon report makes a good read in a powerpoint format rich in pictures, and is an easy introduction to a complex topic for the interested layman. The more scientifically oriented, and truly committed, will want to review the FAO report, Carbon Sequestration in Dryland Soils which goes much more in depth in the science and facts behind soil carbon.

The FAO report sheds some doubt on the optimism in the figures presented by Soil Carbon. For example, Soil Carbon calculates the potential for CO2 sequestration in soil by starting from the assumption that soil organic matter can be increased 1% of the total weight of the soils to a depth of 1 meter. By this calculation, Soil Carbon claims a potential increase of 47 tons of carbon per hectare. As reasonable as a simple “1 % increase” may sound, it appears not to be scientifically valid.

According to the FAO (FAO report, page 28): the carbon content of dryland soils is estimated to be 4 tons/hectare. Carbon content ranges between 7 tons and 24 tons in normal (non-depleted) soils, depending on the climate zone and vegetation. Studies show that non-degraded savannahs can have up to 18 tons C/hectare (top 20 cm). Based on this, one can conclude that an increased carbon sequestration of 18 – 4 = 14 tons/hectare is the most optimistic potential achievement, well under the 47 tons/hectare that Soil Carbon suggests is achievable. Nonetheless, the FAO report point out that increasing the carbon content by only 1.5 tons/hectare on 2 billion hectares of degraded lands could balance out predicted increases in CO2 concentrations in the atmosphere due to annual emissions increases. (FAO report, page 6) This would buy time while fossil-fuel free technologies are developed.

Soil Carbon also targets exclusively the use of ruminant grazing as a soil restoration method. This is only one of many methods, which must be used in combinations depending on the local conditions. As much as the beef lovers amongst us may cheer the finding that cattle are an essential part of a healthy farming eco-system, the FAO points out that there is a large amount of disagreement about the value of ruminants in soil carbon cycling. That manure is the most efficient manner to incorporate carbon into soils is undebated. But some studies point out that feed must be grown on adjoining land, thereby depleting it, so the carbon added to one piece of land is in effect merely displaced from other land, rather than a net positive addition. The question of methane production, a 23-times more potent greenhouse gas than carbon dioxide, must also be considered. Somehow humorous in the multi-faceted evaluations required to make good decisions is the statement in the FAO report that when conducting carbon audits: “it is essential to remember that the purpose of agriculture is to feed people.”

The most interesting facet of the FAO report for the non-scientist may be the discussions of using funding available from carbon offsetting to implement soil restoration projects and help farmers apply methods which benefit soil carbon levels. The additional income from carbon offsetting would help alleviate poverty, and the more productive farming possible after restoration of soils could break farmers out of the cycle of land depletion for mere survival. Although the development of accurate models to measure carbon offsets and the implementation of measures to reduce the risk of reversal of the gains present obstacles, the prospect of carbon sequestration in soils is a win-win for developed and developing nations.

References:

Soil Carbon: Putting Carbon Back Where it Belongs – In The Earth; http://www.soilcarbon.com.au/case_studies/index.html

Scientists Develop Low-Cost Version of CCS (Carbon Capture & Storage)

In Uncategorized on May 18, 2008 at 9:42 pm

by Jeremy Elton Jacquot, Los Angeles on 05.17.08 for Treehugger.com

helsinki coal plant
Image courtesy of melancholic optimist via flickr

Carbon capture and storage (CCS) has always been a tough proposition: Scientists and environmentalists worry about the potential leakage from storage sites and its additional fuel requirements, while energy utilities complain about the excessive costs and risks associated with the technology. A new technology developed by scientists at the University of Wyoming, Laramie, could help ease its adoption by significantly reducing the cost factor.

Currently, companies typically pass their carbon dioxide emissions through a solution containing monoethanolamine (MEA) to bind the gas. The process of heating the saturated MEA solution, which is necessary to release CO2 and restore the material, incurs huge costs; it is believed to drive the cost of recovering CO2 to around $47 a ton.

Maciej Radosz and his colleagues at UW decided to use activated carbon and other carbon-rich materials — much cheaper alternatives — to adsorb the CO2. While previous studies had suggested that high pressure conditions were needed for the carbon-rich materials to work effectively, Radosz intuited that separation could also occur under low pressure/temperature conditions — a gamble that paid off when he put it into practice.

The researchers are now working on scaling up the process and on making the carbon materials more selective; if successful, they believe it could drop the cost of CCS to $20 a ton, or less than half current prices. Yet doing so could prove tricky: As we’ve mentioned before, scaling up such technologies can often reveal hidden costs, environmental and other.

URL: http://www.treehugger.com/files/2008/05/better-ccs.php

 

Follow

Get every new post delivered to your Inbox.