With growing understanding of our living environment and advances in science and technology, people now have reached consensus that developing new energy is the fundamental way out for world energy development. Some western countries have taken new energy as the important substitute in their short and medium term plans and the main energy sources in their medium and long term plans.
The Chinese government is attaching more attention to new energy development and has introduced many new measures over the years, in addition to new energy programs in the country's 11th Five-Year Plan (2006-2010).
All fossil fuels including coal, oil and natural gas are the result of accumulating and storing solar energy by living beings during the process of environment evolution on the planet: when the earth entered a relatively stable and suitable phase, algae in the ocean and plants on the land reproduced rapidly through photosynthesis until the earth environment changed due to some internal or external factors. With changing living environment, these living beings were buried deeply underground and turned out to the fossil fuels we use today.
In addition to nuclear and geothermal energy, all renewable energy sources including wind, tide, ocean current and bio-energy comes from the sun. And, solar energy is the fundamental source for endless energy supply in our planet.
Nowadays, with advanced and rapidly developing technology, people become capable of utilizing, collecting and storing solar energy and its derivatives. Therefore, fossil fuel would definitely be replaced by the renewable energy.
What we are facing now is that: on the one hand, with resources depleting, prices of fossil fuels keep climbing up; on the other hand, technology for applying new energy is advancing to bring down application costs.
When mapping out coal development strategy, we are facing one new issue----- the economic life cycle of coal. Fossil fuels like coal and oil would certainly be replaced prior to their exhaustion. And the application costs of new and nuclear energy should be far lower than that of utilizing traditional fossil fuels before such replacement occurs. As a result, fossil fuels would be forced to lower their prices and eventually their energy value would be terminated before running out, which is the so-called termination of economic value or economic cycle life of coal. How long would it be? Perhaps 50 years, 100 years, but not more than 200 years, not to mention 577 years--- the maximum exploitation period for China's coal resources within the depth of 2,000 meters, including a large amount of un-explored resources.
Source: grinding mill machinery jaw crusher raymond mill
source 2: impact crusher
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