CARBON CAPTURE & SEQUESTRATION - CCS
(At right, the
oxyfuel combustion chamber is lifted into place at the Schwarze Pumpe
power plant in Germany, one of the first power plants in the world to
capture carbon dioxide.)
| CCS
is a process of stripping carbon dioxide from fossil fuels before or
after they are burned. Water vapor is removed resulting in a dry gas of
99% CO2 in compressed form. It is then converted into liquid CO2 for
storage and transport. Over
recent years, therefore, both industry and governments are looking at
"clean coal" as the solution. To continue burning of coal, CCS is seen
as essential in preventing CO2 emissions, but progress is seriously
hampered both by cost and viability. Can that much CO2 be captured? At
what cost? Is it diverting
investment away from alternative clean sources like wind and solar? |
Recent news: Jan 16 2012: Growing
doubts in Europe on future of carbon storage. Two
carbon capture and storage projects in Germany and Britain were canceled last
quarter, and many of the remaining projects will probably share that fate this
year, imperiled by a mix of regulatory objections, a lack of money, public
opposition to the possible geological risks and broader uncertainty about
strategies to slow climate change. link
Nov 10 2011: FutureGen
2.0 – another setback. The leading American effort to capture carbon dioxide
from coal plants has hit a stumbling block that could imperil the project. The
Midwestern power company that was to be the host for the project said
because of its financial situation, it cannot take part as promised, although
it has not told them exactly what it will do. The federal government promised
the project $1 billion, or roughly 80% of its costs, on the condition that the
money be spent by the end of 2015. That’s a tight time frame for developing a
technology that has never been used on a commercial scale, the participants
said. link
August 2011: Europe’s largest CCS project halted. link
_________________________________________ Below:
- Investing in carbon storage
- Problems and the case against CCS
- Costs of CCS
- Natural carbon sinks
- How CCS would work
| Investing in carbon storage |
August 2011: U.S. invests again in major CCS scheme. Just a few weeks after American Electric Power
abandoned plans to build a $668m CCS facility, the US government stepped up a
gear this week, with the start of construction on the government's first
industrial-scale scheme with $141m of public money and another $66.5m from
private sector sources. The plant in Decatur, Illinois, could be operational in
2013, and capture and store one million tonnes of CO2 per year to be held 7,000 feet beneath the surface in the
saline Mount Simon Sandstone formation. Another $41m is allocated to 16 more
projects to focus on developing technologies capable of capturing at least 90% of
CO2 produced, as well as reducing the added costs at power plants to no more
than a 35% increase in the cost of electricity produced. link June 2011: CCS
begins with limited storage. Southern Company utility announced a 25-megawatt
carbon capture and storage facility in Alabama. Located near Mobile,
the CCS facility is the world's largest for a coal-fired generating power
plant. It will capture about 150,000 tons of CO2 annually for permanent
underground storage in a deep saline geologic formation, the equivalent of emissions from 25 megawatts
of electricity generation. link June 2011: After 10 years of development, CCS technology is on the point of large-scale
deployment. A new global market is opening up, from which Europe is well
positioned to benefit given its technological lead. The findings of a detailed study have shown that
carbon capture and storage (CCS) is efficient and cost competitive.
In a series of demonstrations, CCS was shown to capture and sequester 90% of the
emitted carbon dioxide. link April 2011: Saskatchewan plans world's largest CCS project. The
world's largest commercial-scale carbon capture and storage (CCS) project has
been given the go-ahead in Canada. The $1.24bn project in Saskatchewan will see
CCS technology constructed next to the ageing 824 MW Boundary Dam power station
operated by state utility SaskPower. Construction on the project will begin
immediately, and the plant should be capable of capturing around one million
tonnes of CO2 every year when completed in 2014. link November 2010: German engineering giant, Siemens, said it is close to a practically zero
emission carbon capture technique. The first
phase in a pilot facility at the 2GW Staudinger coal-fired plant in Germany,
operated for over 3,000 hours with an efficiency over 90%. link
August 2010: Global consortium plans breakthrough
project in Britain. A global consortium led by British clean
energy pioneer B9 Coal will develop a 500-megawatt breakthrough project that
will establish Britain as a world leader in CCS technology.
The project will employ AFC Energy’s alkaline fuel cells and Linc Energy’s
underground coal gasification process. The coal gasification technology creates
syngas, which then undergoes a cleanup process that separates the gas into
streams of hydrogen and carbon dioxide. The hydrogen is used to power fuel
cells, while the carbon dioxide is captured and prepared for transport and
storage. link
August 2010: New twist for "FutureGen" project. The US Department of Energy yesterday awarded $1 billion to a
pioneering near-zero emission carbon capture and storage project. Dubbed
"FutureGen2" it replaces long-standing plans to build an experimental
coal-fired plant which would capture and store CO2 underground. link
(Aug. 13: However a
small town in Illinois has pulled out of the controversial project raising
questions about where the carbon emissions captured will be stored - link)
June 2009: Recent global action to fund carbon capture and storage (CCS) technology is unprecedented. New project funding announced last month in the European Union, Canada,
Australia and the United States is building momentum for accelerating the use of
CCS to reduce greenhouse gas emissions. The G8’s goal of 20 demonstrations
announced by 2010 – a goal that once seemed insurmountable – could be within reach. In Australia, the federal government allocated USD$2 billion to build between
two and four coal-fired power plants, each generating up to 1,000 MW, that have
CCS capabilities. This funding action came shortly after Prime Minister Kevin Rudd announced the formation
of the $70 million, investor-backed Global Carbon Capture and Storage Institute. World Resources Institute. | Problems and the case against CCS |
September 2011: CS floundering world-wide. In
Beijing, delegates including the US energy secretary, Steven Chu,
heard
that the global temperature is on course to rise by 3.5C, due to poor progress
both on carbon capture and storage, and on acceptance of a carbon price and
other carbon-cutting efforts. Projects to capture and bury a major chunk of
that are behind schedule and finding it harder to secure funds. According to the IEA, global energy demand has
more than doubled in the past 40 years and even with the most favourable
assumptions will grow another 35% by 2035, which will take carbon dioxide emissions
above 35 gigatonnes per year. To reach the 2C
goal, the IEA estimates there will have to be 1,500 large-scale CCS projects
around the world by 2035. However, only 74 have been announced, and the trend
is in the wrong direction. "We're seeing a decline in new projects due to
a softening global economy and an uncertain carbon price," said Brad Page,
head of the Australia-based Global CCS Institute. link July 2011: Future for carbon capture looks dimmer. American Electric Power shelves
plans for a commercial-scale carbon capture and sequestration project
that was a centerpiece of the federal government's so-called Clean Coal
Initiative. So far, no commercial-scale CCS
plants are in operation in the US, and the technology is beginning to look more
and more economically unfeasible. link October 2011: £1bn flagship carbon capture scheme is cancelled. Britain's efforts to fight
climate change suffered an embarrassing setback when the Government
abandoned plans for the UK's first coal-fired power plant fitted with
technology to capture and store carbon emissions. The flagship project at
Longannet fell apart after the
consortium planning to build it, headed by ScottishPower and including Shell
and the National Grid, demanded considerably more investment than the £1bn
which the Government had set aside for the scheme. link May 2011: Why CCS viability is daunting. At
the 10th annual Conference on Carbon Capture and Sequestration in
Pittsburgh (PA) it did not come as much of a surprise when the chief executive
of one of the largest utility companies in the United States questioning the
viability of carbon-storage ventures in the next few years. Michael Morris,
chief executive of American Electric Power said that the energy industry needs
a signal from politicians in Washington DC. He believes that with time,
industry can surmount the technical issues, but it is not a cheap proposition. To keep CO2 emissions below 450 parts per million by
2050, an oft-cited target associated with a roughly 50% chance of keeping
global warming below 2 degrees, would involve 3,200 projects sequestering some
150 gigatonnes of CO2, roughly 70 times the United States’ total carbon
emissions from electricity generation in 2009. link January 2011: Canadian CCS test site leaking and dangerous. Scientists are questioning the most damning evidence
that a high profile carbon capture and storage project in Weyburn,
Saskatchewan, is leaking and dangerous. The finding casts doubt on claims by
industry and researchers that the project is safe, and that carbon dioxide
can't escape from its reservoir 1.4 km below the earth. Weyburn is considered
a global test case for carbon capture and storage. link November 2010: Risks of storage found at potential CCS sites.
A year-long analysis of core samples from four drinking water
aquifers by Duke University researchers showed that the potential for
contamination from underground storage at potential CCS sites
could pose risks from leaks. link September 2010: New study suggests CCS technology in Europe doomed. Innovative
carbon-trapping technology might barely get past the testing phase in
Europe after the economic crisis and a shift to green power destroys
incentives, a new study warns. Massive
European investment in renewable energy will reduce demand for carbon
emissions permits in 2020, dragging down their price and undermining
investment in Carbon Capture and Storage (CCS), says the report "EU
Energy Trends to 2030" by the National Technical University of Athens. link
December 2010: Carbon capture project in Queensland, Australia ends. The
$4.3 bn coal-fired station was due to open in 2015., but concerns about
its viability brought a close to the project as it was not seen as
economically viable. link
July 2009: The spread of localised resistance is a force that some fear could sink Europe's
attempts to build 10 to 12 demonstration projects for CCS by 2015 - link April 2010: U.S. research paper questions viability of carbon capture and storage. A
new research paper from American academics is threatening to blow a
hole in growing political support for carbon capture and storage as a
weapon in the fight against global warming. The document from Houston
University claims that governments wanting to use CCS have
overestimated its value and says it would take a reservoir the size of
a small US state to hold the CO2 produced by one power station. The
paper concludes that CCS "is not a practical means to provide any
substantive reduction in CO2 emissions, although it has been repeatedly
presented as such by others." link Robert Bryce, a senior fellow at the Manhattan Institute argues the CCS technology faces three potentially
insurmountable hurdles: it greatly reduces the output of power plants; pipeline
capacity to move the newly captured carbon dioxide is woefully insufficient; and
the volume of waste material is staggering. link The IPCC estimates that power plants would need between 11% and 40% more fuel once CCS technologyy is installed . link British geologists and engineers refute carbon capture doubts - link June 2010: Potential of "clean coal" to reduce emissions is overstated. Environmental advocates say they've poked a hole in the popularized belief
that capturing and burying CO2 underground is an effective response to the
threat of global climate change. Called carbon capture and sequestration (CCS),
the CO2 burial process is also called "clean coal" in industry advertising
campaigns.The paper concludes that "CCS cannot deliver significant reductions in time
to play a role in the effort of keeping the global temperature increase below 2
degrees Celsius." link May 2009: A serious doubt
on the questionability of CCS being viable at all was raised by
European energy companies seeking a get-out clause from a 2025 deadline
to re-equip coal plants because of unproven technology. Companies,
including German-owned groups E.ON and RWE npower, want guarantees that
they will not be forced to close their coal-fired plants in 2025 if the
technology has not been proven. Failing to receive guarantees, the
companies said they will not invest in a new generation of cleaner coal
plants. link The International Energy Agency (IEA) warned in October 2008 that global CCS spending and
activity levels are “nowhere near enough” to achieve an agreed G8 goal to begin
developing 20 large-scale demonstration CCS projects by 2010. The IEA said
several industrial-size pilot CCS projects planned for Europe, North America
and Australia are making “slow progress” and if they fail to materialise soon,
it will be at least 2030 before CCS can contribute meaningfully to
greenhouse-gas reduction. However China is beginning to lead the way
to explore CCS more aggressively and promising even to build cleaner
plants at lower costs than conventional plants elsewhere in the world. link October 2009: The IEA released a report saying that at least 850
full-scale CCS plants need to be built by 2030 - 100 of them by 2020 - if the
world is to avoid dangerous climate change
by halving global carbon emissions by 2050. To date, no plant has been shown to
be able to trap and bury the emissions from a power station on a commercial
scale. link March 9 2011:CCS projects expanding, but at greater cost. Despite
soaring costs for the technology, 21 new carbon capture and storage (CCS)
projects got underway worldwide during 2010 according to Australia’s Global CCS
Institute. The study says 234 CCS projects were active or planned worldwide at
the end of 2010, up from 213 at the end of 2009. 77 of these projects are fully
integrated, large-scale projects demonstrating the complete CCS value chain. The amount of government
funding allocated to individual projects also increased significantly in 2010,
and now comes to $40bn in all, the majority of which is being put into 25
individual projects. The overwhelming majority of CCS projects are in Europe and North
America. link August 12 2010: EPA and DOE say "clean coal" not possible without carbon pricing. In
a new report to President Obama, the agencies claim the main obstacle
to deployment of CCS technology is political, not technical.The
findings reflect input from 14 federal agencies and departments, as
well as hundreds of stakeholders and CCS experts, the report said. lin July 22 2009: New study finds CCS very expensive. Harvard’s Belfer Center for Science and International Affairs has published a
blockbuster study, “Realistic
Costs of Carbon Capture.” The paper concludes that First-of-a-Kind (FOAK)
carbon capture and storage plants are going to be much more expensive than most
people realize. link February 10 2010: President Obama has called for the rapid national adoption of "clean
coal" technology. Last week, shortly after his budget address, President Obama ordered a
high-level task force to deliver a plan within 180 days determining how "to
overcome barriers to the widespread, cost-effective deployment of CCS within 10
years, with the goal of bringing 5 to 10 commercial demonstration projects on
line by 2016." Obama's executive office memorandum looks like a big victory for the coal
industry, which was already handed $3.8 billion in last year's stimulus act for
carbon capture and storage (CCS) research and development and deployment. He did
not simultaneously order a similar plan for a big roll-out of solar or wind
energy to level the playing field. However CCS technology is projected to be notoriously expensive. No full-scale
demonstration plant has yet been built, and the pieces of technology that have
to fit together add significant cost to operations. Capturing carbon is the first step, and still quite expensive. It also
requires the plant to burn about 25% more coal to power the capture process.
Special pipelines need to be built to carry the CO2 in a supercritical state to
suitable underground injection sites; these must be monitored for leakage and
insured against catastrophe; and perhaps royalties must be paid to landowners
for the use of underground pore space. link
When the British CCS project was first
mentioned a few years ago the sum of half-a-billion pounds ($725 million) per
plant for the extra equipment was mooted. Now the figure estimated is between
£1-2 bn ($1.45 - $2.9 bn). As with any CCS costs in America, this would come from taxpayers. Richard Conniff, a 2007 Guggenheim Fellow, explores why and
how the coal industry, through advertising, is promoting ‘Clean Coal’ with the
expectation of a carbon-tax seriously affecting their industry under an Obama
administration. Conniff writes: “The business logic of this spending pattern is
clear: Promoting the illusion that coal is clean, or maybe could be, helps to
justify building new coal-fired power plants now.” link | GAO: Current CCS technology plagued by high costs, uncertain results. Officials
from one state public utility commission reported that they considered
CCS immature and were unlikely to to approve cost recovery for such a
project in the foreseeable future. link |
A Massachusetts Institute
of Technology (MIT) study (Table 3.1) estimated that fitting carbon capture
to an ultra-supercritical - the most efficient - coal plant would reduce the
efficiency, meaning that 27% more coal would be needed. In April 2009, Britain’s
Energy Secretary, Ed Miliband announced that 4 new coal-fired stations would be
constructed, but only if they captured CO2. However he limited this capture to
20-25% only, insisting that "when the technology is proven [we
will make a] commitment that CCS will be fitted on the entire plant." This
means 75% or more of CO2 emissions will still pollute the air. [This still
makes it dirtier than uncontrolled natural gas-fired stations.] Further, it
admits that the technology does not as yet exist. Britain’s Alistair Darling
(former Chancellor of the Exchequer) said in May 2007: “It is true to say that the
technology to capture, transport and store the carbon exists, but it has not
actually been joined up on a commercial basis yet … these things might never
become available”. George Monbiot in the Guardian writes: “So here's
the difficulty for the government. It will approve a new generation of
coal-burning power stations, starting with Kingsnorth in Kent, on the basis
that they will one day reduce their emissions by means of a technology that has
not yet been demonstrated." In Britain 31% of energy comes from
coal-fired plants - in the USA it is currently 47%. October 20 2010: Kingsnorth project shelved - E.On UK shelves plans to compete saying it is uneconomical to build. link
Forests: The world's forests and oceans are natural regulators of carbon dioxide content in the atmosphere. While
forests are regarded as sinks, meaning they absorb carbon dioxide, forests are increasingly being cut
down. Eighty percent of the forests that originally covered the earth have been
cleared, fragmented, or otherwise degraded: over the past 150 years, deforestation has contributed an estimated 30%
of the atmospheric build-up of CO2.link See also Indonesia - Peat adds to problem Oceans: Oceans' ability to sequester carbon diminishing. The
globe's oceans are massive carbon sinks: more than a quarter of carbon
emissions from humans have been sequestered by the oceans. According to
a new study - the first of its kind - an annual accounting of the
oceans' intake of carbon over the past 250 years suggests troubling
news. According to the study, published in Nature, the oceans' ability to
sequester carbon is struggling to keep-up with mankind's ever-growing emissions. link But it's a complex system; it
takes about a thousand years for the ocean to complete one mixing
cycle. As a result the ocean simply cannot take up excess carbon fast
enough to match the anthropogenic (human-caused) increase. Only 40-50% of
the carbon added to the atmosphere since 1800 has dissolved in the
ocean, with 28% still remaining in the atmosphere. In
summary the oceans have only a limited capacity to absorb anthropogenic
carbon dioxide increases. link
Coastal habitats. Highly endangered coastal habitats are incredibly effective in sequestering
carbon and locking it away in soil, according to a new paper in a report by the
International Union for Conservation of Nature (IUCN). The paper attests that coastal habitats - such as mangroves, sea grasses,
and salt marshes - sequester as much as 50 times the amount of carbon in their
soil per hectare as tropical forest. The key difference between these coastal habitats and forests is that mangroves,
seagrasses and the plants in salt marshes are extremely efficient at burying
carbon in the sediment below them where it can stay for centuries or even
millennia. link Pre-combustion CCS.
Pre-combustion CO2 capture involves removing all or part of the carbon
content before burning it. The fuel is processed to produce a gas
stream that primarily consists of CO2 and hydrogen. The CO2 is
then captured for storage and the hydrogen is combusted in a
conventional gas turbine combined cycle to generate electricity,
resulting in a flue gas that only consists of water vapor. But, so far, only a small pilot project (Vatenfalls) in northern
Germany has connected all the different stages of the CCS chain together. The
pilot is an oxyfuel boiler that can generate 30MW of heat and around 12MW of
electricity. link
One disadvantage of the pre-combustion method is that it cannot be
retro-fitted to the older pulversised coal power plants that make up much of the
world's installed base of fossil fuel power. It could perhaps be used in natural
gas stations, where a synthetic gas is first produced by reacting the methane
with steam to produce carbon dioxide and hydrogen. But the economic advantage of
this method over post-combustion is yet to be proven. link First breakthrough - October 2009: The world’s largest carbon capture facility at a coal factory was introduced
Friday by French firm Alstom - the pilot facility catches and contains around 20 megawatts of carbon dioxide
from West Virginia’s Mountaineer plant. Since the unit can handle only a portion of Mountaineer’s 1,300 megawatt
capacity, the remaining captured carbon dioxide is buried 7,200 feet
underground. Philippe Joubert, the head of Alstom's power division, said "What we are able to prove now, for the people who want to hear, is that the
technology is here, there is no longer any doubt." Opponents believe the technology prolongs the life of an industry that is
responsible for more of the “greenhouse gas” emissions that add to global
warming than any other fuels. Critics also argue it will deplete funding for energy conservation
programs or research into renewable fuels: the Sierra Club urged developers to consider the potential effects of
pollution to local water and possible seismic activity if West Virginian
aquifers are filled with liquid carbon dioxide. link How would
carbon storage work? more A basic look at "clean coal". from Ecoseed The case
against clean
coal:
http://action.thisisreality.org/about Of several alternatives, coal generation with CCS is the
least promising as it has some major strikes against. However it does have some
advantages as well. CCS technology already builds on the practice
in the oil industry of pumping carbon dioxide into oil and gas wells to increase
yield by forcing out more oil and natural gas. Pro: - Taps into a still vast energy store (coal deposits) so can be called upon
when needed independent of weather conditions and in response to electric
demand.
- Provides jobs and revenue for existing industries and communities (coal
mining and coal transport)
Con:
- Uses an unsustainable fuel – coal will run out.
- Coal mining is often very destructive to the landscape and to coal miners.
- Mass carbon dioxide release from underground is considered unlikely but
potentially lethal for people and wildlife as well as defeating the purpose of
CCS.
- CCS may not reduce or eliminate the other pollutants associated with coal
combustion including mercury emissions, SOx and NOx.
- There are still no functioning plants/it is an experimental technology.
- CCS plants will be much more expensive than existing coal plants, removing
one of the prime selling points of coal, i.e. that it is cheap.
- CCS or “clean coal” has been used as a public relations “cover” to justify
the building of new coal generating plants without adding the “optional” CCS
facilities.
Coal with CCS may have a role in a transition to a more sustainable energy
system but it is by design a stop-gap solution. link
_____________________________________________
The Guardian Environment web pages has an exclusive page devoted to CCS - link
For
an exhaustive study of "How to Clean Coal" refer to
the Natural Resources Defense Council's essay:
link
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