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Clean coal is a concept for processes or approaches that mitigate emissions of carbon dioxide (CO2) and other greenhouse gases that arise from the utilization of coal, mainly for electrical power generation, using clean coal technology. Currently, the term ''clean coal'' is used in the coal industry primarily in reference to carbon capture and storage, which pumps and stores CO2 emissions underground, and plants using integrated gasification combined cycle (IGCC). IGCC involves coal gasification, which provides a basis for increased efficiency and lower cost in capturing CO2 emissions.〔 〕 Prior to the current focus on carbon capture and storage, the term clean coal had been used to refer to technologies for reducing emissions of NOx, sulfur, and heavy metals from coal combustion. There are seven clean coal technologies currently deployed: carbon capture and storage, flue-gas desulfurization, fluidized-bed combustion, integrated gasification combined cycle (IGCC), low nitrogen oxide burners, selective catalytic reduction (SCR), and electrostatic precipitators.〔(【引用サイトリンク】url=http://www.nma.org/pdf/fact_sheets/cct.pdf )〕 ==Regulations== Since the 1970s, various policy and regulatory measures have created a growing commercial market for clean coal technologies, with the result that costs have fallen and performance has improved.〔(【引用サイトリンク】url=https://www.iea.org/publications/freepublications/publication/Clean_Coal_CIAB_2008.pdf )〕 The widespread deployment of pollution-control equipment to reduce sulphur dioxide, NOx and dust emissions is just one example that brought cleaner air to many countries. The need to tackle rising CO2 emissions to address climate change later introduced Carbon Capture and Storage (CCS).〔 Within the United States, Carbon Capture and Storage technologies are mainly being developed in response to regulations by the Environmental Protection Agency—most notably the Clean Air Act—and in anticipation of legislation that seeks to mitigate climate change. Loan guarantees and tax incentives have a long history of use in Australia, EU countries and the US to encourage the introduction of clean coal and other green technologies.〔 The widespread deployment of pollution-control equipment to reduce sulphur dioxide, NOx and dust emissions is just one example that brought cleaner air to many countries. The need to tackle rising CO2 emissions to address climate change later introduced Carbon Capture and Storage (CCS).〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Clean coal」の詳細全文を読む スポンサード リンク
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