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yaa4t9c2
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Joined: 13 Dec 2010
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AirMax 95 Igcc – What It Is, And Why Igcc Is The |
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ortunately, this technology is not easy for the ordinary public to understand,[link widoczny dla zalogowanych], but that does not mean that it should be ignored or dismissed, in fact it is all the more important to persevere until you do understand. It is important that as many people as possible appreciate how this could help a world desperately in need of low cost energy produced in the most environmentally responsible way.
The typical Integrated Gasification Combined Cycle power plant consists of four major operating components:
1. an air separation unit (ASU) to provide pure oxygen;
2. a gasification plant where heat is generated;
3. a gas clean-up system;
4. and a combined-cycle power plant (which by “combined cycle” simply means that the energy from both the high pressure gas produced by gasification, and the the steam from gas combustion has passed through the turbine).
The gasification process takes place at extremely high pressure and temperature which very effectively almost totally destroys all of the residual toxic and polluting chemicals which traditional coal fired power station combustion leaves behind.
IGCC is the cleanest technology available so far for the conversion of solid fuel into electricity. The emissions expected and achieved from these plants when compared to standard coal plants (and that includes even the newest proposed throughout the world today) are far lower.
Another great feature of IGCC is that it is the only thermal power option, excluding new nuclear plants,[link widoczny dla zalogowanych], that effectively mitigates fuel price volatility while addressing current and future environmental concerns. An IGCC project’s fuel cost hedging capability stems from its ability to gasify any combination of natural gas, coal, and waste-products such as petroleum coke.
As we have already indicated, but wish to stress is that the power is generated from both the gas and steam turbines, resulting within this combined cycle, a much higher efficiency. This is even after the loading placed upon the turbine as it simultaneously compresses the feed reactants, as it turns.
That IGCC using coal for power generation is currently the cleanest coal technology available is being demonstrated to the US House of Representatives, committee on Energy and Commerce, Subcommittee on Energy and Air Quality in an programme commenced in 2003,[link widoczny dla zalogowanych], at four plants that are currently operating.
Perhaps the principal obstacle to the development of IGCC projects is their capital cost compared to conventional steam/electric options. The capital cost of a new IGCC facility is around 20 to 30% higher than the cost of a new conventional pulverized-coal-fired plant.
Implementing IGCC is a long term strategy for hedging against oil price rises. As the oil and gas prices rise the argument for IGCC just keeps getting stronger. Until now, although many in the US have recommended that an accelerated shift toward coal use by gasification would put a long-term ceiling on the price of oil a stronger lobby has pointed out that the United States would benefit more financially from simply scaling up extraction of offshore oil and natural gas.
For the present, especially in the US, coal-fired plants are still competitive while IGCC technology is being implemented in a few plants, and is getting its chance to prove commercial viability.
But, the final benefit from IGCC of easy and simple carbon capture within the process when you gasify like this, is likely to be the winning feature ultimately driving this new technology forward into mainstream generating capacity. Carbon separation and long term capture,[link widoczny dla zalogowanych], before its emission (as Carbon Dioxide) to the atmosphere from the flue gases is also called “carbon sequestration” in the US.
Carbon sequestration has yet to be proven but could become a large factor in reducing climate change from carbon emissions. The idea is that you produce carbon dioxide, but don't emit it to the atmosphe
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Sat 4:01, 18 Dec 2010 |
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