About the Coal Energy?

Question

1. How is it done? Why does it produce energy?
2. How does it worK? How does it apply to the technology?
3. Give present day examples...?

Answer 1

Your question is a little too vague.

You liberate the energy from coal by burning it, a simple fire that gets hot enough will give you burning coal, and this has been known longer than the English language.

According to: http://en.wikipedia.org/wiki/Energy_value_of_coal
“The calorific value Q of coal is the heat liberated by its complete combustion with oxygen. Q is a complex function of the elemental composition of the coal. Q can be determined experimentally using calorimeters. Dulong suggests the following approximate formula for Q when the oxygen content is less than 10%:

Q = 337C + 1442(H - O/8) + 93S,

where C is the mass percent of carbon, H is the mass percent of hydrogen, O is the mass percent of oxygen, and S is the mass percent of sulfur in the coal. With these constants, Q is given in kilojoules per kilogram.”

“Coal purity is ranked in an ascending order of carbon content: Lignite → sub-bituminous coal → bituminous coal → anthracite.”

According to: http://en.wikipedia.org/wiki/Coal
“Coal is a fossil fuel formed in swamp ecosystems where plant remains were saved by water and mud from oxidization and biodegradation. Coal is a readily combustible black or brownish-black rock. It is a sedimentary rock, but the harder forms, such as anthracite coal, can be regarded as metamorphic rocks because of later exposure to elevated temperature and pressure. It is composed primarily of carbon along with assorted other elements, including sulfur. It is the largest single source of fuel for the generation of electricity world-wide, as well as one of the largest sources of carbon dioxide emissions, which is considered the primary cause of global warming. Coal is extracted from the ground by coal mining, either underground mining or open pit mining (surface mining).”

Coal is important in the steel and power plant industries. Steel = iron with 6% added carbon that first came from coal. Most of the power generated in the US and China is by coal, one of the most polluting fuels that creates a lot of carbon dioxide waste.

Now you should have asked about this: Clean Coal Technology; how it works, what is it, and who is working on it.

I works by increasing the temperature to convert it to gas and then burning it again with steam to get rid of the sulfur dioxide, then it is burned again to make it economical to recover the CO2.

It works by burning the waste enough times that you can get rid of the pollution and recover the pollutants for use in industry or to inject it back into the ground and so keep it our of the air; but it is only in a pilot program, no one is using it. Plants eat CO2 so an algae that can be refined to oil grown in plastic bags, using the waste from the plant would be totally green.

According to: http://en.wikipedia.org/wiki/Clean_coal_technology
“Clean coal is the name attributed to coal chemically washed of minerals and impurities, sometimes gasified, burned and the resulting flue gases treated with steam, with the purpose of almost completely eradicating sulfur dioxide, and reburned so as to make the carbon dioxide in the flue gas economically recoverable. The coal industry uses the term "clean coal" to describe technologies designed to enhance both the efficiency and the environmental acceptability of coal extraction, preparation and use, with no specific quantitative limits on any emissions, particularly carbon dioxide. So, it cannot be called clean from an environmental point of view, because it is carbon emissioner.

The burning of coal, a fossil fuel, is the principal causes of anthropogenic climate change and global warming. The concept of clean coal as a solution to climate change and global warming is claimed to be "greenwash" by some environmental organizations such as Greenpeace[2] because emissions and wastes are not avoided, but are transferred from one waste stream to another. The Australian of The Year, renowned scientist and author Tim Flannery has been reported as saying "Coal can't be clean".

There are no coal-fired power stations in commercial production which capture all carbon dioxide emissions, so the process is theoretical and experimental and thus a subject of feasibility or pilot studies. It is has been estimated that it will be 2020 to 2025 before any commercial-scale clean coal power stations (coal-burning power stations with carbon capture and sequestration) are commercially viable and widely adopted. This time frame is of concern because there is an urgent need to mitigate greenhouse gas emissions and climate change to protect the world economy according to the Stern report. Even when CO2 emissions can be caught, there is considerable debate over the necessary carbon capture and storage that must follow.”

Answer 2

Coal is the predominant fuel for electricity generation in the United States, with just under half of the country's electricity coming from generators driven by coal-fired boilers. The coal is burned, evaporates water in the boiler to produce steam, which spins a turbine attached to a generator. The used steam is condensed back to water, and re-injected into the boiler to continue the process. The efficiency depends on the steam temperature -- the higher the better.

Answer 3

#1, the rapid oxidation of carbon, principally, as well as the decomposition of the mass into burnable gases. Heat generated by the process of, simply stated, burning of the coal releases energy in the basic forms of radiant heat, and light.
#2, is basically answered in question #1.
#3, fossil fuel power plants use coal. Steel mills use a modified form of coal known as "coke". Coal is used in furnaces in buildings to heat water, make steam, or to operate small electricity generating plants to supply power to the local facility. You might want to take the time to ask your local power company about the use of coal, or Google it for the wealth of information that is available for the uses of coal. Coal tar, by the way, is used in some medicines.

Answer 4

Graphite Coal is considered to be the highest grade of coal. It is ranked above anthracite coal. Graphite is not normally considered as coal since it very difficult to ignite and not used as a fuel.