An Advanced Control System For Fine Coal Flotation
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An Advanced Control System For Fine Coal Flotation
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Author :
language : en
Publisher:
Release Date : 1999
An Advanced Control System For Fine Coal Flotation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
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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Author :
language : en
Publisher:
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 Fifth Quarterly Technical Progress Report October 1 1996 December 31 1996
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Author :
language : en
Publisher:
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.
An Advanced Control System For Fine Coal Flotation Final Technical Progress Report October 1 1995 June 30 1996
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Author :
language : en
Publisher:
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 Floatation
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Author :
language : en
Publisher:
Release Date : 1998
An Advanced Control System For Fine Coal Floatation 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.
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 collector dosage, frother dosage, 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 eighth quarter of this project, the analysis of data collected during Task 2 (Sampling and Data Analysis) was completed, and significant progress was made on Task 3 (Model Building and Computer Simulation). Previously, a plant sampling campaign had been conducted at Pittston s Moss No. 3 preparation plant to provide data for the development of a mathematical process model and a model-based control system. During this campaign, a one-half factorial design experiment, blocked into low and high feed rates, was conducted to investigate the effects of collector, frother, and pulp level on model parameters. In addition, samples were collected during the transient period following each change in the manipulated variables to provide data for confirmation of the dynamic process simulator. A residence time distribution (RTD) test was also conducted to estimate the mean residence time. This is a critical piece of information since no feed flowrate measurement is available, and the mean residence time can be used to estimate the feed flowrate. Feed samples were taken at timed intervals and floated in a laboratory flotation cell to investigate the magnitude of feed property disturbances and their duration.
Coal Surface Control For Advanced Fine Coal Flotation
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Author :
language : en
Publisher:
Release Date : 1989
Coal Surface Control For Advanced Fine Coal Flotation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Coal categories.
Coal Surface Control For Advanced Fine Coal Flotation
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Author :
language : en
Publisher:
Release Date : 1992
Coal Surface Control For Advanced Fine Coal Flotation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Coal Surface Control For Advanced Fine Coal Flotation Final Report October 1 1988 March 31 1992
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Author :
language : en
Publisher:
Release Date : 1992
Coal Surface Control For Advanced Fine Coal Flotation Final Report October 1 1988 March 31 1992 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
The initial goal of the research project was to develop methods of coal surface control in advanced froth flotation to achieve 90% pyritic sulfur rejection, while operating at Btu recoveries above 90% based on run-of-mine quality coal. Moreover, the technology is to concomitantly reduce the ash content significantly (to six percent or less) to provide a high-quality fuel to the boiler (ash removal also increases Btu content, which in turn decreases a coal's emission potential in terms of lbs SO2/million Btu). (VC).
Engineering Development Of Advanced Physical Fine Coal Cleaning Technologies
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Author :
language : en
Publisher:
Release Date : 1990
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 1990 with categories.
An engineering development project was prepared to build upon the basic research effort conducted under a solicitation for research into Fine Coal Surface Control. The engineering development project is intended to use general plant design knowledge and conceptualize a plant to utilize advanced froth flotation technology to process coal and produce a product having maximum practical pyritic sulfur reduction consistent with maximum practical BTU recovery. This is being accomplished by utilization 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. 31 figs., 22 tabs.