An Advanced Control System For Fine Coal Flotation Sixth Quarter Technical Progress Report July 1 September 30 1997
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An Advanced Control System For Fine Coal Flotation Sixth Quarter Technical Progress Report July 1 September 30 1997
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Author :
language : en
Publisher:
Release Date : 1997
An Advanced Control System For Fine Coal Flotation Sixth Quarter Technical Progress Report July 1 September 30 1997 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Over the past thirty years, process control has spread from the chemical industry into the fields of mineral and coal processing. Today, process control computers, combined with improved instrumentation, are capable of effective control in many modem flotation circuits. Unfortunately, the classical methods used in most control strategies have severe limitations when used in froth flotation. For example, the nonlinear nature of the flotation process can cause single-input, single-output lines to battle each other in attempts to achieve a given objective. Other problems experienced in classical control schemes include noisy signals from sensors and the inability to measure certain process variables. For example, factors related to ore type or water chemistry, such as liberation, froth stability, and floatability, cannot be measured by conventional means. The purpose of this project is to demonstrate an advanced control system for fine coal flotation. The demonstration is being carried out at an existing coal preparation plant by a team consisting of Virginia Polytechnic Institute and State University (VPI & SU) as the prime contractor and J.A. Herbst and Associates as a subcontractor. The objectives of this work are: (1) to identify through sampling, analysis, and simulation those variables which can be manipulated to maintain grades, recoveries, and throughput rates at levels set by management; (2) to develop and implement a model-based computer control strategy that continuously adjusts those variables to maximize revenue subject to various metallurgical, economic, and environmental constraints; and (3) to employ a video-based optical analyzer for on-line analysis of ash content in fine coal slurries.
An Advanced Control System For Fine Coal Flotation Fourth Quarterly Technical Progress Report July 1 1996 September 30 1996
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language : en
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Release Date : 1997
An Advanced Control System For Fine Coal Flotation Fourth Quarterly Technical Progress Report July 1 1996 September 30 1996 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
A model-based flotation control scheme is being implemented to achieve optimal performance in the handling and treatment of fine coal. The control scheme monitors flotation performance through on-line analysis of ash content. Then, based on the economic and metallurgical performance of the circuit, variables such as reagent dosage, pulp density and pulp level are adjusted using model-based control algorithms to compensate for feed variations and other process disturbances. Recent developments in sensor technology are being applied for on-line determination of slurry ash content. During the fourth quarter of this project, a final attempt was made to calibrate a video-based ash analyzer for use in this application. It was concluded that the low ash content and the coarse particle size of the flotation tailings slurry at the Maple Meadow plant site made the video-based system unsuitable for this application. Plans are now underway to lease a nuclear-based analyzer as the primary sensor for this project.
An Advanced Control System For Fine Coal Flotation Final Technical Progress Report October 1 1995 June 30 1996
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language : en
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Release Date : 1996
An Advanced Control System For Fine Coal Flotation Final Technical Progress Report October 1 1995 June 30 1996 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
A model-based flotation control scheme is being implemented to achieve optimal performance in the handling and treatment of fine coal. The control scheme monitors flotation performance through on-line analysis of ash content. Then, based on the economic and metallurgical performance of the circuit, variables such as reagent dosage, air addition rate, pulp density and pulp level are adjusted using model-based control algorithms to compensate for feed variations and other process disturbances. Recent developments in video-based sensor technology are being applied for on-line determination of slurry ash content. During the third quarter of this project, work continued on the testing and calibration of the video-based ash analyzer, and a plant sampling campaign was conducted to provide data for the development of a mathematical process model and the model-based control algorithms.
An Advanced Control System For Fine Coal Flotation Fifth Quarterly Technical Progress Report October 1 1996 December 31 1996
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Author :
language : en
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Release Date : 1997
An Advanced Control System For Fine Coal Flotation Fifth Quarterly Technical Progress Report October 1 1996 December 31 1996 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
A model-based flotation control scheme is being implemented to achieve optimal performance in the handling and treatment of fine coal. The control scheme monitors flotation performance through on- line analysis of ash content. Then, based on the economic and metallurgical performance of the circuit, variables such as reagent dosage, pulp density and pulp level are adjusted using model-base control algorithms to compensate for feed variations and other process disturbances. Recent developments in sensor technology are being applied for on-line determination of slurry ash content. During the fifth quarter of this project, all work was on hold pending the final novation of the contract to Virginia Polytechnic Institute and State University.
Engineering Development Of Advanced Physical Fine Coal Cleaning Technologies
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language : en
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Release Date : 1991
Engineering Development Of Advanced Physical Fine Coal Cleaning Technologies written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
This document a quarterly report prepared in accordance with the project reporting requirements covering the period from July 1, 1992 to September 30, 1992. This report provides a summary of the technical work undertaken during this period, highlighting the major results. A brief description of the work done prior to this quarter is provided in this report under the task headings. The overall project scope of the engineering development project is to conceptually develop a commercial flowsheet to maximize pyritic sulfur reduction at practical energy recovery values. This is being accomplished by utilizing the basic research data on the surface properties of coal, mineral matter and pyrite obtained from the Coal Surface Control for Advanced Fine Coal Flotation Project, to develop this conceptual flowsheet. The conceptual flowsheet must be examined to identify critical areas that need additional design data. This data will then be developed using batch and semi-continuous bench scale testing. In addition to actual bench scale testing, other unit operations from other industries processing fine material will be reviewed for potential application and incorporated into the design if appropriate. The conceptual flowsheet will be revised based on the results of the bench scale testing and areas will be identified that need further larger scale design data verification, to prove out the design.
Engineering Development Of Advanced Physical Fine Coal Cleaning Technologies
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Author :
language : en
Publisher:
Release Date : 1991
Engineering Development Of Advanced Physical Fine Coal Cleaning Technologies written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
The design criteria for each unit operation have been developed based upon a number of variables. These variables, at this time, are based upon the best engineering design information available to industry. A number of assumptions utilized in the design criteria are uncertain. The uncertainties of inert atmospheres for grinding and flotation as well as pyrite depressants were answered by the Surface Control Project. It was determined that inerting was not required and no ''new'' reagents were presented that improved the flotation results. In addition, Tasks 5 and 6 results indicated the required reagent dosage for conventional flotation and advanced flotation. Task 5 results also indicated the need for a clean coal, thickener, the flocculent dosages for both the clean coal and refuse thickeners, and final dewatering requirements. The results from Tasks 5 and 6 and summarized in Task 7 indicate several uncertainties that require continuous long duration testing. The first is the possibility of producing a grab product for both the Pittsburgh and Illinois No. 6 coals in conventional flotation. Second what does long-term recirculation of clarified water do to the product quality? The verification process and real data obtained from Tasks 5 and 6 greatly reduced the capital and operating costs for the process. This was anticipated and the test work indeed provided confirming data.
2534 2537
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Author :
language : en
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Release Date : 1995
2534 2537 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
Engineering Development Of Advanced Physical Fine Coal Cleaning Technologies
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Author :
language : en
Publisher:
Release Date : 1991
Engineering Development Of Advanced Physical Fine Coal Cleaning Technologies written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
This document a quarterly report prepared in accordance with the project reporting requirements covering the period from July 1, 1992 to September 30, 1992. This report provides a summary of the technical work undertaken during this period, highlighting the major results. A brief description of the work done prior to this quarter is provided in this report under the task headings. The overall project scope of the engineering development project is to conceptually develop a commercial flowsheet to maximize pyritic sulfur reduction at practical energy recovery values. This is being accomplished by utilizing the basic research data on the surface properties of coal, mineral matter and pyrite obtained from the Coal Surface Control for Advanced Fine Coal Flotation Project, to develop this conceptual flowsheet. The conceptual flowsheet must be examined to identify critical areas that need additional design data. This data will then be developed using batch and semi-continuous bench scale testing. In addition to actual bench scale testing, other unit operations from other industries processing fine material will be reviewed for potential application and incorporated into the design if appropriate. The conceptual flowsheet will be revised based on the results of the bench scale testing and areas will be identified that need further larger scale design data verification, to prove out the design.
Engineering Development Of Advanced Physical Fine Coal Cleaning Technologies
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Author :
language : en
Publisher:
Release Date : 1993
Engineering Development Of Advanced Physical Fine Coal Cleaning Technologies written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
The Department of Energy (DOE) awarded a contract entitled ''Engineering Development of Advanced Physical Fine Coal Cleaning Technology - Froth Flotation'', to ICF Kaiser Engineers with the following team members, Ohio Coal Development Office, Babcock and Wilcox, Consolidation Coal Company, Eimco Process Equipment Company, Illinois State Geological Survey, Virginia Polytechnic Institute and State University, Process Technology, Inc. This document a quarterly report prepared in accordance with the project reporting requirements covering the period from July 1, 1992 to September 30, 1992. This report provides a summary of the technical work undertaken during this period, highlighting the major results. A brief description of the work done prior to this quarter is provided in this report under the task headings.
Poc Scale Testing Of An Advanced Fine Coal Dewatering Equipment
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language : en
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Release Date : 1998
Poc Scale Testing Of An Advanced Fine Coal Dewatering Equipment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Froth flotation technique is an effective and efficient process for recovering of ultra-fine (minus 74 pm) clean coal. Economical dewatering of an ultra-fine clean-coal product to a 20% level moisture will be an important step in successful implementation of the advanced cleaning processes. This project is a step in the Department of Energy's program to show that ultra-clean coal could be effectively dewatered to 20% or lower moisture using either conventional or advanced dewatering techniques. The cost-sharing contract effort is for 36 months beginning September 30, 1994. This report discusses technical progress made during the quarter from July 1 - September 30, 1997.