Topic
Clean coal technology
About: Clean coal technology is a research topic. Over the lifetime, 2397 publications have been published within this topic receiving 44179 citations. The topic is also known as: CCT.
Papers published on a yearly basis
Papers
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TL;DR: A comprehensive literature survey of coal structure, chemistry and catalysis involved in coal-to-liquids (CTL) can be found in this paper, where the authors provide an overview of the coal structure and chemistry involved in direct coal liquefaction.
Abstract: Increased demand for liquid transportation fuels coupled with gradual depletion of oil reserves and volatile petroleum prices have recently renewed interest in coal-to-liquids (CTL) technologies. Large recoverable global coal reserves can provide liquid fuels and significantly reduce dependence on oil imports. Direct coal liquefaction (DCL) converts solid coal (H/C ratio ≈ 0.8) to liquid fuels (H/C ratio ≈ 2) by adding hydrogen at high temperature and pressures in the presence or absence of catalyst. This review provides a comprehensive literature survey of the coal structure, chemistry and catalysis involved in direct liquefaction of coal. This report also touches briefly on the historical development and current status of DCL technologies. Key issues, challenges involved in DCL process and directions for the future research are also addressed.
309 citations
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TL;DR: In this article, coal co-firing of biomass with coal has been shown to increase boiler efficiency, reduce fuel costs, and reduce emissions of NOx and fossil CO2.
305 citations
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01 Jan 1979
TL;DR: In this paper, the origins, formation, and properties of coal are discussed. And the action of solvents on coal is discussed. But they do not discuss the role of coal in coal processing.
Abstract: Origins, Formation, and Properties of Coal: Origins and Formation. Compositions. Classification. Physical Properties. Chemical Properties. Behavior at Elevated Temperatures. The Action of Solvents on Coal. Upgrading, Handling, and Processing of Coal: Benificiation, Cleaning, Drying, and Briquetting. Transportation and Storage. Combustion. Carbonization and Tar Processing. Gasification. Coal Liquefaction. Environmental Aspects of Coal Utilization. Subject Index.
300 citations
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TL;DR: In this paper, the state of the art in the field of clean coal technologies evidencing the perspectives of improvement and the critical elements is presented, both the emission control of NOx, SOx and particle matter and the advanced coal conversion pathways like ultra-supercritical (USC), pressurized fluidized bed combustion (PFBC), and integrated gasification combined cycle (IGCC) are reviewed and analyzed.
294 citations
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TL;DR: In this paper, it was shown that >50% of the Hg0(g) reacts with oxidants in coal combustion flue gases; results for gasification conditions are lacking.
Abstract: Coal combustion and gasification are an anthropogenic source of mercury emission to the atmosphere. Effectively minimizing the emission and understanding the atmospheric fate and transport of mercury require knowledge of its speciation in flue gases. Hg0(g) is the thermodynamically stable form in the highest temperature regions of combustors and gasifiers. Hg0(g) remains as the dominant form in the relatively reducing conditions of a gasification flue gas, but with decreasing temperature in a combustion flue gas Hg0(g) will react to form Hg2+ compounds. Current mercury speciation analysis results suggest that generally >50% of the Hg0(g) reacts with oxidants in coal combustion flue gases; results for gasification conditions are lacking. Oxidation is beneficial because Hg2+ compounds are generally water-soluble and are therefore more effectively captured by wet scrubber pollution control systems and are more apt to deposit locally or regionally. Conversely, Hg0(g) is difficult to control and is likely to e...
274 citations