DeepResource

Observing the renewable energy transition from a European perspective

Archive for the category “coal”

Breathing New Storage Life into Stranded Fossil Power Plants

E2S Power will offer a cost-effective and easy to operate solution for transforming fossil fuel power stations into thermal storage systems for renewable energy.

This ‘drop-in’ solution will be able to feed the plant’s turbo-generator sets – which remain in place – with steam at the exact same conditions and flow rates that the boiler would have provided. The modular design of our product allows for straightforward adaptation to a variety of power plant sizes and layouts. Our unique advantages over other thermal storage concepts are lower price and smaller footprint, enabled by a novel thermal storage material called Miscibility Gap Alloys.

The Company is Swiss-based, but very (Eastern) European.

[e2s-power.com] – Company site

Price Coal Skyrockets

Price nearly triples in a matter of 12 months.

Not so good for the economy, very good for the energy transition.

[twitter.com] – Corné van Zeijl

US Coal Consumption 1850-2020

Trump’s promised “beautiful clean coal” revival didn’t happen.
At all.
Thank God.
Back at 1910-level.
Trend: further deep South.

[twitter.com] – US Coal Consumption 1850-2020

Britain Could Do Without Coal for More Than 8 Days

This #Coal free run ended at 8 Days 1 Hour 25 Minutes.

This is the longest run without coal for Great Britain since 1882.

Generation during this time was met by: Gas 45%, Nuclear 21%, Wind 12%, Imports 10%, Biomass 6%, Solar 5%, Large Hydro <1%, Storage <1%

[twitter.com]

UCG Reader

[core.ac.uk] – University of Leeds: UCG Where in the World? (2014)

Read more…

UCG R&D in the US

Major 2017 US UCG study, saying that UCG can be a viable source of fossil energy, but that the technology had its heyday in the seventies and eighties and was abandoned then and a lot of senior knowledge and skills has evaporated since. This study supports our attitude that their is no lack of fossil to worry about. The real constraint is the capacity or lack thereof of the environment and atmosphere in particular to absorb all that burned fossil fuel without major consequences for the biosphere. Don’t worry about depletion, worry about how to get away as quickly as possible from fossil fuel.

[e-reports-ext.llnl.gov] – A Review of Underground Coal Gasification Research and Development in the US (2017). David W. Camp – Lawrence Livermore National Laboratory

Here chapter 10 from the report in full, with our highlights:

10 Concluding remarks

Recent U.S. work between 2005 and 2014 improved understanding of UCG’s environmental aspects, produced improved models, matured site selection processes, and contributed to the review and sharing of UCG information. But the main program of the 1970’s and 1980’s is when the big contributions were made.

The United States work of the 1970’s and 1980’s produced great advances in UCG understanding and technical accomplishments. The technical feasibility of UCG was demonstrated convincingly in the western world. It showed that UCG operations could be designed, constructed, started, operated, and shut down safely. The U.S. started with reports from the Soviet Union that described UCG operations and phenomena, making use of Soviet methods during many field tests. Multiple organizations working at different sites developed a breadth and depth of competence and understanding of UCG, and used this expertise to experiment, innovated, and make great advancements in UCG capabilities, and technology.

Air was injected to make low heating value gas (4-7 MJ/Nm3), and mixtures of oxygen and steam were injected to make medium heating value gas (8-13 MJ/Nm3). U.S. field test operations were at the scale of 1,000 to 10,000 tons of coal in a single module, although some of the modules had multiple burn cavities in them.

Operations almost always ended up working, but they did not always go smoothly as planned. Hardware issues and challenges in the underground and extremely hot environment were a frequent reminder that UCG is still low on the technological development curve towards mature industrial practice.

Some field tests resulted in groundwater contamination. This led to a much greater awareness and understanding of this problem, and recommended approaches to minimize it. The final Rocky Mountain 1 test used many of these and contamination was minor, local, and reduced to deminimus levels after a period of pumping. It remains to be seen if subsequent UCG operations, especially ones at scale can be operated with acceptably low environmental impacts.

Technologies were developed, making use of the rapidly improving technology of directional or horizontal drilling and well completions. These showed promise for scale-up to larger and deeper operations while retaining process efficiency and control. ELW had first been tried in a successful improvisation at Hoe Creek III, and then fielded at Rocky Mountain 1. The greatest technological advance was the invention of the CRIP technique. After successful demonstration in the Centralia field test, CRIP was fielded and performed excellently at the Rocky Mountain 1 test. Designs based on CRIP show great promise for cost-effective scale-up to large, deep and efficient operations.

Most of the early large-scale designs and plans naively assumed that large industrial scale operations would be scaled up with a simple pilot program to gather values for a few key parameters. The complexity and difficulty of UCG was such that despite a long well-funded program, the final field test, while deploying many technical and environmental advances, was not much more than twice the size of the first field test, 14 years earlier. There were no long-term operations of multiple modules or the execution of a full “mine plan.” This was not for lack of interest or enthusiasm for industrial scale – scaleup to a size that would help U.S. energy security was always on researchers minds and addressed in nearly every report.

Doing UCG well, smoothly, and with low environmental impact was simply difficult and required experience and improved methods that needed to be invented and practiced. Much of the test design, construction, and operations were being tried for the first or second time by people doing these things for the first or second time. They faced the challenges always posed by geology, thermal processing of coal, and process engineering pilot start-ups, often in remote locations in harsh weather.

This was a period of strong and continued investment, intense activity, and a great pace of development and learning. Some of the keys to its technical success were long-term continuity of funding and the institutions working on it, sharing of results in public conferences and reports, and determination to understand UCG and make improvements.

While the many field tests formed the centerpiece of the program, they were not isolated activities. The program was robust and well rounded. Measurements of gas composition and quality were made to understand and improve the process, not to advertise success. There was iteration between field test observations, scientific understanding of phenomena, modeling, and lab experiments, with each informing and improving the other. Field tests were first and foremost experimental trials and innovation test-beds. They were not marketing endeavors designed to attract investors and project partners. They emphasized learning, understanding, and technical advancement over simple metrics such as tons gasified. Field tests were highly instrumented and monitored, and drill-backs were common. The mechanisms and geometries of cavity growth, and the contents and nature of the cavities became understood. Conceptual models of the process evolved to better explain and predict observed phenomena.

Program participation was well-rounded. Government research institutions led much of the field test and modeling work. Large energy companies and small UCG-niche companies also had programs that typically included field tests, sometimes with government support and sometimes not. University researchers were involved with laboratory experiments and model development. Experience, capabilities, and knowledge and insight were gained by those actively involved. A sizeable cadre of competent researchers, engineers, and technicians by the 1980’s made the potential growth of an industry feasible. This has now been lost, as all but the most junior of participants of that generation are past retirement age.

Their legacy of reports, and reviews such as this one can convey only a fraction of what these workers knew.

The Annual UCG Symposia tied all these efforts together, fostering communication among researchers to build upon each other. Organized by the DOE, participation and written papers were expected of DOE-funded projects, but many others attended and presented. Because of government funding, a large fraction of the activities was documented well in publicly accessible reports.

UCG understanding and technology advanced in the U.S. in a crucible that mixed creative ideas and the hard realities of field test operations. Observations and results, surprises and disappointments, revisions to mental and mathematical models, and the desire to understand and innovate moved the researchers toward better ways of doing UCG.

A consensus developed in the U.S. that UCG’s future would be in deep horizontal seams of moderate to large thickness, ideally with low-permeability coal and surrounding strata, and a strong overburden. Directional drilling and CRIP appeared best for process control, efficiency and economics. Further testing and development would be needed to assure its reliability, sort out a preference for its linear or parallel embodiment, optimize it, and/or innovate to something even better.

The U.S. UCG program of the 1970’s and 1980’s was extraordinarily productive and successful at advancing a difficult technology. It began with very little domestic knowledge or experience. It ended with a large cadre of experts, successful single-module field tests, a good understanding of the phenomena involved, predictive models, new and more efficient technology and methods, and a good understanding and plans of what next steps were needed to scale up and mature to large-scale industrial operations.

Australian University Turns CO2 Back Into Coal Again

With fluid metal as catalyst, Australian scientists from the RMIT university succeeded in turning CO2 back in coal again at room-temperature.

[spiegel.de] – Forscher wandeln Kohlendioxid wieder in Kohle um
[nature.com] – Room temperature CO2 reduction to solid carbon species on liquid metals featuring atomically thin ceria interfaces

End of Coal Mining in Germany

After 200 years, old school coal mining comes to end in Germany.

[spiegel.de] – “Man hat gedacht, man könnte die Natur beherrschen”

Read more…

In-Situ Steenkool Verbranding in Nederland

[source]

For the second time in history, locally occurring deposits of coal may come to make a significant contribution to the fuel market in the Netherlands within the next fifty years (up until 2034).

In the early seventies coal mining came to a stop due to steeply rising wages and the discovery of a huge natural gas reservoir then equivalent to approximately 30 times the annual Dutch energy consumption in 1982, It is expected that the energy derived from native coals will become competitive early next century, because of the high costs of landed North Sea Gas, since all onshore gas fields will then be exhausted.

The Dutch coal resources both onshore and offshore are part of the Northwest European coal basin extending from Mid-Germany to England.

The coal bearing carboniferous sediments contain a large amount of hard coal in thin sloping layers. Along the Northwestern coast the top of the carboniferous strata occurs at a depth of 3000 meters. Going inland the carboniferous layers rise until they reach the surface in the Southeastern part of Holland near the border with Germany (where as a consequence coal was mined in the past).

In order to permit an evacuation of future coal use, geophysical surveys are in progress for coal deposits up to a depth of 1500 meters.

At the same time long term research and desk studies are being encouraged by the Government within the framework of a National Coal Research Program. The subject of this report: The applicability of in-situ gasification in Dutch coalfields, is one of these studies.

In chapter 1 the preference for studying in depth underground gasification as a technique for exploiting deep lying thin coal seams in the Netherlands is elucidated.

In chapter 2 horizontal drilling (art extension of deviated drilling) is adopted as a means of disclosing coal seems at acceptable economic and social costs. A survey of the experience gained of in-situ gasification in several countries explains why new gasification models and techniques have to be developed and demonstrated for typical Dutch- and West European conditions. Apart from some modest European efforts the Morgantown Energy Technology Center (USA) is the only institute which attempts to establish a relevant development program.

In chapter 3 a gasification model is set up to provide a basis for a development plan and an economic evaluation of ín-situ gasification.

Chapter 4 deals with site selection for 50 MW demonstration plants t producing either clean gas or electricity, and with the associated safety and environmental aspects. The surface arrangements and underground lay-outs are based on detailed design and engineering efforts. Where necessary for a better understanding of techniques (and prices) commercial tenders have been collected.

Prices for products from demonstration plants and from commercial scale plants are estimated in chapter 5 for a wide range of parameters. Supposing a successful development and therefore a proven technology, the final demonstration plant may produce electricity at a price of approximately 0.23 guilders per kW-hour (75 mills*)/kWh).

Further maturation including additional progress in horizontal drilling may lower the production costs in a commercial plant (sealed up from 50 to 330 MWt) till 0.06 guilders/kWh. This would mean that even the costs of possible future denoxing and complete desulphurization of the flue gases would not jeopardize the economic viability of in-situ gasification.

The utilization of domestic coal deposits reduces the dependency on imported energy. Therefore it seems worthwhile to execute the R&D program specified in chapter 6. The main uncertainties attached to the gasification model may be resolved within five years at an expenditure of 6-8 million guilders.

In chapter 7 it is concluded that in-situ gasification of highly carbonized coal, occurring in deep lying thin seams, is hampered by only a small number of obstacles. Its viability can be assessed at relatively low cost. Governmental involvement with such investigations may be diminished by agreements with interested foreign parties to cooperate, and in the demonstration phase of the development also by industrial participation.

*) 1 US dollar ~ 3 Dutch guilders.

[ecn.nl] – De Mogelijkheden van In-Situ Steenkool Verbranding in Nederland (1984)
[volkskrant.nl] – ‘Steenkool nodig in overgang naar schone energie’ (2005)
[trouw.nl] – DSM overweegt heropening mijnen (2008)
[nemokennislink.nl] – Nederland, olie- en gascentrum van West-Europa (2009)

North Sea UCG

“We think there are between three trillion and 23 trillion tonnes of coal buried under the North Sea,” explained Dermot Roddy, former professor of energy at Newcastle University.

“This is thousands of times greater than all the oil and gas we have taken out so far, which totals around six billion tonnes. If we could extract just a few per cent of that coal it would be enough to power the UK for decades or centuries.”

[worldcoal.com] – Huge coal deposits discovered in North Sea
[ingenia.org.uk] – Underground coal gasification (2010)



Dr Dermot Roddy

[coalresearchforum.org] – The commercialisation of UCG
[ukccsrc.ac.uk] – Dr Dermot Roddy
Dermot Roddy is Five-Quarter’s Chief Technology Officer, leading the company’s highly-specialised and innovative technological remit. He joined the company directly from Newcastle University, where he was Professor of Energy. Dermot is an internationally-respected industry professional and academic, with extensive energy and related downstream industry experience in both the traditional and renewable sectors. He began his working life in academia (with Bachelor and Doctorate degrees from Queen’s University, Belfast), before branching out into industry, working his way up to leadership positions with ICI (overseeing the building and running of chemicals factories) and Petroplus International in the Netherlands. Dermot’s previous positions include being Chairman of Northeast Biofuels; a Director of the UK Hydrogen Association; the VP of the Northeast Electricity companies Association and a Member of the Energy Leadership Council. Prior to his tenure as Professor of Energy at Newcastle University, Dermot was the CEO of Renew Tees Valley, which delivered significant economic regeneration through inward investment and expansion of indigenous businesses in renewable energy.

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