Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Circulating Fluidized Bed Technology Generates Power While Reducing Emissions

15.07.2009
Burning coal and biomass to generate power while reducing emissions at the same time, Circulating Fluidized Bed (CFB) technology uses fluidization to mix and circulate fuel particles with limestone as they burn in a low-temperature combustion process. Unlike conventional steam generators that burn the fuel in a massive high-temperature flame, CFB technology does not have burners or a flame within its furnace.

As described in ASM International's Advanced Materials & Processes magazine, the limestone captures the sulfur oxides as they are formed, while the low burning temperature minimizes the formation of nitrogen oxides.

The fuel and limestone particles are recycled over and over back to the process, which results in high efficiency for burning the fuel, capturing pollutants, and for transferring the fuel’s heat energy into high quality steam to produce power.

Due to the vigorous mixing, long burning time, and low temperature of the combustion process, CFBs are fuel flexible, which means they can cleanly burn traditional coal fuels, as well as “carbon neutral” biomass and waste fuels. This ability to cleanly burn virtually any combustible material greatly surpasses the fuel limitation of conventional combustion processes.

Unlike conventional steam generators, CFBs capture and control harmful pollutants during the burning process and do not need to rely on add-on pollution control equipment. In addition, Foster Wheeler Power Group, Clinton, N.J., has applied highly efficient vertical-tube, supercritical steam technology to their utility-scale CFB designs. Supercritical steam enables more of the fuel’s energy to be transferred to the steam. This improves power plant efficiency, reducing the amount of fuel needed for electricity production and further reducing emissions.

Due to its ability to burn carbon-neutral fuels such as biomass along with coal, CFB technology offers a unique solution to the CO2 issue. Biomass is considered carbon neutral since it absorbs and stores carbon from the atmosphere during its growth cycle through the natural photosynthesis process. When biomass is burned, it releases the same carbon back to the atmosphere, resulting in nearly zero net carbon emitted to the atmosphere. However, due to the world’s limited and undeveloped biomass supply chain, existing biomass power plants are limited to about 25 to 50 MWe in size. The plant’s small scale, coupled with its fuel supply limitation, translates into electricity costing about 20 to 30% more than that from conventional fossil power plants.

Again, the CFB offers a solution. Due to its fuel flexibility, a large scale (300 MWe or larger) CFB power plant can be built to burn a combination of coal and several types of biomass. This solution captures both the environmental benefit of reducing CO2 emissions, and the economic benefit of providing affordable electricity. It is also flexible enough to utilize more biomass when it is available, or fall back on coal when it is not. This concept can produce a substantial reduction in CO2 emissions.

The entire article, written by Robert Giglio and Justin Wehrenberg of the Foster Wheeler Power Group, Clinton, N.J., was published originally in the May 2009 issue of Advanced Materials & Processes magazine and may be accessed free of charge at www.asminternational.org/amp.

Rego Giovanetti | Newswise Science News
Further information:
http://www.asminternational.org

More articles from Ecology, The Environment and Conservation:

nachricht Global threat to primates concerns us all
19.01.2017 | Deutsches Primatenzentrum GmbH - Leibniz-Institut für Primatenforschung

nachricht Reducing household waste with less energy
18.01.2017 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Quantum optical sensor for the first time tested in space – with a laser system from Berlin

For the first time ever, a cloud of ultra-cold atoms has been successfully created in space on board of a sounding rocket. The MAIUS mission demonstrates that quantum optical sensors can be operated even in harsh environments like space – a prerequi-site for finding answers to the most challenging questions of fundamental physics and an important innovation driver for everyday applications.

According to Albert Einstein's Equivalence Principle, all bodies are accelerated at the same rate by the Earth's gravity, regardless of their properties. This...

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Tracking movement of immune cells identifies key first steps in inflammatory arthritis

23.01.2017 | Health and Medicine

Electrocatalysis can advance green transition

23.01.2017 | Physics and Astronomy

New technology for mass-production of complex molded composite components

23.01.2017 | Process Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>