Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 38 for “"Clean Coal"”.
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CLEAN(ING) COAL: THE ENTHYMEMATIC QUALITIES OF IMAGES, EDITING AND COLOR IN CLEAN COAL ADVERTISING
… protection are not in opposition. Appeals to "clean coal" highlight such a rhetorical tactic. The attempt by the coal industry to rebrand coal as "clean" is a political tactic to downplay environmental concerns and avoid regulation or backlash. A significant feature to the "clean coal" …
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Zero emissions, zero poverty in Kenya: a review of whether Lamu Coal Power Plant promotes a pro-poor low carbon development pathway
… eradicate poverty and mitigate climate change. "Clean coal" is one of the low carbon developments that the country has proposed. This study investigates how "clean coal" can assist Kenya to remain low carbon and develop properly. The analysis of the literature and qualitative data consists of …
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Methods of Improving Oil Agglomeration
… that oil can spontaneously displace water from coal's surface if the coal particle has a water contact angle greater than 90°. However, the clean coal products obtained from laboratory-scale dewatering-by-displacement (DbD) test work assayed moistures substantially higher than expected. These …
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Optimization of Integrated Coal Cleaning and Blending Systems
The fundamental requirement for a coal preparation plant is to transform low value run-of-mine (ROM) material into high value marketable products. The significant aspect relative to the plant is that any gain in efficiency flows almost entirely to the "bottom line" for the operation. The …
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Effects of Pressure on Coal Pyrolysis at High Heating Rates and Char Combustion
Clean coal technologies are now becoming popular because of their high efficiencies and minimal environmental impact. Higher operating pressures have been applied to clean coal technologies. The effect of pressure on coal pyrolysis and char combustion has been extensively studied but still remains …
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Precombustion desulfurization of coal by photochemical methods and pyrite depression in froth flotation
The precombustion desulfurization of coal was investigated by photochemical methods and by the application of a novel pyrite depressant in froth flotation. Semiconductor photoelectrochemical catalysis was extensively examined. As much as 41% of the organic sulfur was removed and 72% overall …
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Cleaning and Dewatering Fine Coal using Hydrophobic Displacement
… both mineral matter and surface moisture from coal in a single process. Previous thermodynamic analysis suggests that coal moisture will be spontaneously displaced by any oil with a contact angle greater than ninety degrees in water. Based on these results, six methods of hydrophobic …
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An investigation of fine coal grinding kinetics
… shown in developing methods for preparing super—clean coal containing less than 2% ash and 0.5% sulfur. New techniques for recovering fine coal, such as micro—bubble flotation, can achieve the desired result provided mineral matter is sufficiently liberated. To achieve sufficient liberation, …
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Identification of Improved Stratigies for Processing Fine Coal
In modern coal preparation plants, solid-solid and solid-liquid separation processes used to treat fine coal are least efficient and most costly operations. For example, field studies indicate that the froth flotation process, which is normally used to treat minus (-0.2 mm) fine coal, often …
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Improved strategies for processing fine coal streams
In modern coal preparation plants, solid-solid and solid-liquid separation processes used to treat fine coal are least efficient and most costly operations. For example, field studies indicate that the froth flotation process, which is normally used to treat minus (-0.2 mm) fine coal, often …
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Redesign of Industrial Column Flotation Circuits Based on a Simple Residence Time Distribution Model
… cells a popular choice for upgrading fine coal. Unfortunately, recent production data from full-scale column plants indicate that many industrial installations have failed to meet original expectations in terms of clean coal recovery. Theoretical studies performed using a simple dispersion …
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Design And Testing Of A Triboelectrostatic Separator For Cleaning Coal
Numerous advanced coal-cleaning processes have been developed in recent years that are capable of substantially reducing both ash and sulfur-forming minerals from coal. However most of the processes involve fine grinding and use water as a medium; therefore, the clean coal products must be …
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Development of a Simulation Model for Fluidized Bed Mild Gasifier
… has been developed to provide an innovative clean coal technology. The objective of this study is to developed a numerical model to investigate the thermal-flow and gasification process inside a specially designed fluidized-bed mild gasifier using the commercial CFD solver ANSYS/FLUENT. …
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Computational Scheme Guided Design of a Hybrid Mild Gasifier
… has been developed to provide an innovative clean coal technology. The objectives of this study are to (a) incorporate a fixed rate devolatilization model into the existing 2D multiphase reaction model, (b) expand the 2D model to 3D and (c) utilize the improved model to investigate the …
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Design, construction, and evaluation of coal extraction pilot plant to manufacture coal-based carbon pitch
… matter, including the inorganic sulfur, from coal has been developed by the Department of Chemical Engineering at WVU. The extraction is preformed at mild conditions (202°C and atmospheric pressure) using the solvent N-Methyl-2-Pyrrolidone (NMP). Laboratory results have shown that this …
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Analysis of Biomass/Coal Co-Gasification for Integrated Gasification Combined Cycle (IGCC) Systems with Carbon Capture
… Technology (IGCC) has become more common in clean coal power operations with carbon capture and sequestration (CCS). Great efforts have been spent on investigating ways to improve the efficiency, reduce costs, and further reduce greenhouse gas emissions. This study focuses on investigating …
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Carbon capture and storage in the U.S. : a sinking climate solution
Coal-fired power plants produce half of the United States' electricity and are also the country's largest emitter of carbon dioxide, the greenhouse gas responsible for climate change. Carbon Capture and Storage (CCS) is a proposed technological solution that will sequester CO2 in the ground. …
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Continuous column flotation of ultrafine coal using microbubbles
… to remove ash-forming minerals from micronized coal. The microbubble generator used In this work has been characterized and found to yield a very narrow size distribution. Microbubble column flotation tests have been conducted to study a series of operating variables such as time, bubble size, …
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Fine coal beneficiation: comparison study of the separation efficiency of a dense medium cyclone and flat-bottom cyclone
Near-gravity material (NGM) is the fraction of coal particles with a relative density within a range of ± 0.1 of the relative density of the separating medium during coal washing. High levels of NGM in coal impede classifier separation efficiency because NGM particles have low settling rates, which …
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Analysis and optimization of the Graz cycle : a coal fired power generation scheme with near-zero carbon dioxide emissions
… low cost of fossil fuels remains attractive and clean coal technologies are examined as a viable solution. This paper helps identify the many options currently available, including post-combustion capture, pre-combustion capture, and a number of oxy-fuel combustion schemes. One cycle design in …
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