Download or read book Development Testing and Demonstration of an Optimal Fine Coal Cleaning Circuit Task 5 Evaluation of Bench scale Test Results and Equipment Selection for In plant Pilot Tests written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The overall objective of this research effort is to improve the efficiency of fine coal flotation in preparation plants above that of currently used conventional cells. In addition to evaluating single-stage operation of four selected advanced flotation devices, the project will also evaluate them in two-stage configurations. The project is being implemented in two phases. Phase 1 comprises bench-scale testing of the flotation units, and Phase 2 comprises in-plant, proof-of-concept (POC), pilot-scale testing of selected configurations at the Cyprus Emerald preparation plant. The Task 5 report presents the findings of the Phase 1 bench-scale test results and provides the basis for equipment selection for Phase 2. Four advanced flotation technologies selected for bench-scale testing are: Jameson cell; Outokumpu HG tank cell; packed column; and open column. In addition to testing all four of the cells in single-stage operation, the Jameson and Outokumpu cells were tested as candidate first-stage cells because of their propensity for rapid attachment of coal particles with air bubbles and low capital and operating costs. The column cells were selected as candidate second-stage cells because of their high-efficiency separation of low-ash products from high-ash feed coals. 32 figs., 72 tabs.
Download or read book Development Testing and Demonstration of an Optimal Fine Coal Cleaning Circuit written by and published by . This book was released on 1999 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this project was to improve the efficiency of the fine coal froth flotation circuit in commercial coal preparation plants. The plant selected for this project, Cyprus Emerald Coal Preparation Plant, cleans 1200-1400 tph of Pittsburgh seam raw coal and uses conventional flotation cells to clean the minus 100-mesh size fraction. The amount of coal in this size fraction is approximately 80 tph with an average ash content of 35%. The project was carried out in two phases. In Phase I, four advanced flotation cells, i.e., a Jameson cell, an Outokumpu HG tank cell, an open column, and a packed column cell, were subjected to bench-scale testing and demonstration. In Phase II, two of these flotation cells, the Jameson cell and the packed column, were subjected to in-plant, proof-of-concept (POC) pilot plant testing both individually and in two-stage combination in order to ascertain whether a two-stage circuit results in lower levelized production costs. The bench-scale results indicated that the Jameson cell and packed column cell would be amenable to the single- and two-stage flotation approach. POC tests using these cells determined that single-stage coal matter recovery (CMR) of 85% was possible with a product ash content of 5.5-7%. Two-stage operation resulted in a coal recovery of 90% with a clean coal ash content of 6-7.5%. This compares favorably with the plant flotation circuit recovery of 80% at a clean coal ash of 11%.
Download or read book Clean Use of Coal written by DIANE Publishing Company and published by DIANE Publishing. This book was released on 1995-10 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: 4 articles: removing the hazards from coal's hazardous air pollutants; some facts about global climate change; power systems and the environmental challenges; and update on NOx control technologies. Illustrations.
Download or read book Engineering Development of Advanced Physical Fine Coal Cleaning for Premium Fuel Applications written by and published by . This book was released on 1997 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary goal of this project was the engineering development of two advanced physical fine coal cleaning processes, column flotation and selective agglomeration, for premium fuel applications. The project scope included laboratory research and bench-scale testing of both processes on six coals to optimize the processes, followed by the design, construction, and operation of a 2 t/hr process development unit (PDU). The project began in October, 1992, and is scheduled for completion by September 1997. This report summarizes the findings of all the selective agglomeration (SA) test work performed with emphasis on the results of the PDU SA Module testing. Two light hydrocarbons, heptane and pentane, were tested as agglomerants in the laboratory research program which investigated two reactor design concepts: a conventional two-stage agglomeration circuit and a unitized reactor that combined the high- and low-shear operations in one vessel. The results were used to design and build a 25 lb/hr bench-scale unit with two-stage agglomeration. The unit also included a steam stripping and condensation circuit for recovery and recycle of heptane. It was tested on six coals to determine the optimum grind and other process conditions that resulted in the recovery of about 99% of the energy while producing low ash (1-2 lb/MBtu) products. The fineness of the grind was the most important variable with the D80 (80% passing size) varying in the 12 to 68 micron range. All the clean coals could be formulated into coal-water-slurry-fuels with acceptable properties. The bench-scale results were used for the conceptual and detailed design of the PDU SA Module which was integrated with the existing grinding and dewatering circuits. The PDU was operated for about 9 months. During the first three months, the shakedown testing was performed to fine tune the operation and control of various equipment. This was followed by parametric testing, optimization/confirmatory testing, and finally a 72-hour round the clock production run for each of the three project coals (Hiawatha, Taggart, and Indiana VII). The parametric testing results confirmed that the Taggart coal ground to a D80 of 30 microns could be cleaned to 1 lb ash/MBtu, whereas the Hiawatha and Indiana Vil coals had to be ground to D80s of 40 and 20 microns, respectively, to be cleaned to 2 lb ash/MBtu. The percent solids, residence time, shear intensity (impeller tip speed and energy input per unit volume), and heptane dosage were the main variables that affected successful operation (phase inversion or microagglomerate formation in the high-shear reactor and their growth to 2-3 mm in size during low shear). Downward inclination of the vibrating screen and adequate spray water helped produce the low ash products. Btu recoveries were consistently greater than 98%. Two-stage steam stripping achieved about 99% heptane recovery for recycle to the process. Residual hydrocarbon concentrations were in the 3000 to 5000 ppm range on a dry solids basis.
Download or read book Coal Prep 98 written by and published by . This book was released on 1998 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coal Prep 97 written by and published by . This book was released on 1997 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Suitability Evaluation of Emerging Drying Technologies for Fine Clean Coal Drying written by Xinbo Yang and published by . This book was released on 2015 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The selling price of coal product in the market depends on the heating value or BTU content of coal, which is a function of both ash and moisture content. Typically the ash content of fine coal and coarse coal reporting to the clean coal belt of a coal preparation plant are relatively similar from each other, however, the moisture content of fine coal is much higher, i.e., 2 to 3 times that of the coarse coal. In that case, although the fine coal proportion of the total clean coal tonnage produced from a plant is in the 10 to 15% range, as much as 33% of the total moisture content in the clean coal product is contributed by the fine coal fraction. A simple analysis indicates that if the moisture content of the fine coal fraction can be substantially reduced by 50% or more, the density-cut of the coarse coal cleaning circuit can be increased and higher overall plant yield can be obtained while satisfying the overall product heating value specification. To achieve this improvement, the use of a suitable drying technology for fine coal is required. The conventional thermal dryer using convective heating mechanism is an expensive option because of the inherent inefficiencies and safety issues in its operations. The major goal of this study was to evaluate two emerging coal drying technologies, the Nano Drying Technology (NDT) and the Parsepco Drying Technology (PDT), for further reducing moisture content of fine clean coal generating from coal preparation plants in Illinois. The Nano Drying Technology, developed by Nano Drying Technologies, LLC. in West Virginia, makes use of molecular sieves to extract residual moisture from mechanically dewatered coal. In this study, mechanically dewatered fine clean coal collected from Prairie Eagle coal preparation plant, IL and Kepler coal preparation plant, WV were used for the NDT system evaluation. The laboratory experimental results showed that the NDT is able to reduce the moisture content of Illinois fine clean coal from over 20% to less than 10%. Pilot-scale experiments were conducted at NDT LLC's pilot-scale facility in Beckley, WV to evaluate and optimize the system's performance. A parametric study conducted using the Box-Behnken experimental design showed that the mass ratio of molecular sieves to coal feed was the most significant factor for the NDT coal moisture reduction process. An optimal product moisture content of 7.3% was achieved for the IL No. 6 seam coal. The Parsepco Drying Technology is provided by Particle Separation System (PSS) Ltd. in South Africa, which utilizes medium wave infrared radiation to remove the moisture from dewatered fine clean coal. Pilot-scale tests were conducted in Illinois Coal Development Park with IL fine clean coal collected from Prairie Eagle coal preparation plant. Product moisture of 5.3% was achieved with production of 22.8 lb/hr. An optimization analysis on the preliminary tests results was then carried out using Historical Data Respond Surface Method in Design Expert software. The medium-wave infrared radiative (MIR) intensity at 60% of its full power was concluded to be the optimal condition for fine clean coal drying. Feed rate and retention time of drying controlled by coal depth and speed of belt were significant on production. The optimized condition predicted a coal product moisture of 9.5% with production of 57.7 lb/hr. An economic analysis of the plant yield improvement and the resulting revenue gain achievable in a coal preparation plant flow sheet was conducted for Prairie Eagle coal processing plant in Illinois which produces 88 tph mechanically dewatered fine clean coal with average moisture content of 19.66%. The increased coal production of the plant with introducing fine coal drying technology was estimated based on the feed washability data of Knight Hawk coal. Both NDT and PDT are able to reduce the fine coal product moisture to be less than 10%, however, the nanotechnology was proved to be more safety and economical for fine clean coal drying.
Download or read book Coal Prep 99 written by and published by . This book was released on 1999 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coal Prep 2000 written by and published by . This book was released on 2000 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adding Value to Coal Cleaning Wastes written by Gordon R. Couch and published by . This book was released on 1998 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering Development of Advanced Physical Fine Coal Cleaning Technologies written by and published by . This book was released on 1993 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first system to test in the advanced DOE POC was the grinding circuit. The grinding circuit consists of the mill classifying cyclones in reverse closed circuit with the ball mill. Reverse closed circuit means the incoming feed and ball mill product are sized in the mill classifying cyclones ahead of the ball mill. This permits removal of natural-sized material and ground-sized material before recirculation through the ball mill. Numerous tests were conducted to establish the correct combination of orifice sizes, pressures and grinding media to meet the design criteria of 95% passing 200 mesh in the column flotation feed. The results from this test work are shown on Table 13.1, Grinding Circuit Test Results and graphically on Figure 13.2 and 13.3. These graphs show the relationship to Column Feed Rate Versus Size of Column Feed and Column Feed Rate Versus Column Feed Mean Particle Size. Our examination of the data indicates that the ball mill must have the smaller grinding media, and the mill classifying cyclone must be arranged as shown in test 93041901. The next step in the test plan was the 16-test resolution IV fractional factorial experiment of a 26−2 experiment to determine major interaction of operating parameters. The column flotation independent variables are shown on Table 13.2, and the proposed test matrix is shown on Table 13.3.
Download or read book Evaluation of an Advanced Fine Coal Cleaning Circuit written by Parthasarathy Venkatraman and published by . This book was released on 1996 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering Development of Advanced Physical Fine Coal Cleaning Technologies written by and published by . This book was released on 1993 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Work completed produced the criteria for additional engineering analysis, computation and detailed experimental benchscale testing for areas of uncertainty. The engineering analysis, computation, bench-scale testing and component development was formulated to produce necessary design information to define a commercially operating system. In order to produce the required information by means of bench-scale testing and component development, a uniform coal sample was procured. After agreement with DOE, a selected sample of coal from those previously listed was secured. The test plan was developed in two parts. The first part listed procedures for engineering and computational analyses of those deficiencies previously identified that could be solved without bench scale testing. Likewise, the second part prepared procedures for bench-scale testing and component development for those deficiencies previously identified in Task 3.
Download or read book Engineering Development of Advanced Physical Fine Coal Cleaning for Premium Fuel Applications Quarterly Technical Progress Report 9 October 1 1994 December 31 1994 written by and published by . This book was released on 1995 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary goal of this project is the engineering development of two advanced physical fine coal cleaning processes, column flotation and selective agglomeration, for premium fuel applications. The project scope includes laboratory research and bench-scale testing on six coals to optimize these processes, followed by design, and construction of a 2-t/hr process development unit (PDU). The PDU will then be operated to generate 200 ton lots of each of three project coals, by each process. The project began in October, 1992 and is scheduled for completion by March, 1997. During Quarter 9 (October--December, 1995), parametric and optimization testing was completed for the Taggart, Sunnyside, and Indiana VII coal using a 12-inch Microcel{trademark} flotation column. The detailed design of the 2-t/hr PDU grinding, flotation, and dewatering circuits neared completion with the specification of the major pieces of capital equipment to be purchased for these areas. Selective agglomeration test work investigated the properties of various industrial grades of heptane for use during bench- and PDU-scale testing. It was decided to use a hydrotreated grade of commercial heptane due to its low cost and low concentration of aromatic compounds. The final Subtask 6.4 CWF Formulation Studies Test Plan was issued. A draft version of the Subtask 6.5 Preliminary Design and Test Plan Report was also issued, discussing the progress made in the design of the bench-scale selective agglomeration unit. PDU construction work moved forward through the issuing of 26 request for quotations and 21 award packages for capital equipment.
Download or read book Fine Coal Processing written by Surendra K. Mishra and published by William Andrew. This book was released on 1987-12-31 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance Optimization of a Compound Spiral for Fine and Ultrafine Coal Cleaning written by Baojie Zhang and published by . This book was released on 2008 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spiral concentrators have been widely used in coal preparation plants to clean 1 mm x 150 micron particle size coal fraction, which is too fine to be effectively cleaned by heavy medium cyclones and too coarse for froth flotation cells or flotation columns. Conventional spirals are capable of providing excellent clean coal recovery, although at a relatively high ash content. Compound spirals, which provide two stages (rougher-cleaner) of spiral cleaning in a single taller unit, have been commercialized in recent years to improve upon the cleaning performance obtained from conventional spirals. The present study aimed at optimizing the performance obtained from a compound spiral for cleaning especially high sulfur fine and ultrafine coal. Industrial-scale spiral units were utilized for this study in a pilot-scale facility at the Illinois Coal Development Park. A statistically designed experimental program was conducted to optimize ash and sulfur cleaning performance of the compound spiral. It was found that significant cleaning of ultrafine coal (i.e., 150 x 45 micron and even 45 x 25 micron size coal) is achievable with the compound spiral. However, operating conditions for cleaning finer coal fractions ( - 150 micron size coal) have to be significantly different from those used to clean coarser coal fractions (+150 micron size coal). The sulfur rejection trends were different from ash separation efficiency trends in all size fractions except 45 x 25 micron particle size fraction. The probable error (E p) and effective specific gravity of separation (SG 50 c) determined for the compound spiral cleaning of the overall particle size were as low as 0.07 and 1.62, respectively. However, the bypass of a small percentage of clean coal to the tailings stream of the compound spiral, may need further adjustment of the key process parameters. A preliminary economic analysis conducted in this investigation indicated that an annual profit of $3.96 million is achievable by operating a compound spiral circuit to clean 45 ton per hour of 1 mm x 150 micron size fine coal.
Download or read book In plant Testing of a Novel Coal Cleaning Circuit Using Advanced Technologies Quarterly Report March 1 May 31 1996 written by and published by . This book was released on 1996 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research conducted at Southern Illinois University at Carbondale over the past two years has identified highly efficient methods for treating fine coal (i.e., -28 mesh). In this study, a circuit comprised of the three advanced fine coal cleaning technologies is being tested in an operating preparation plant to evaluate circuit performance and to compare the performance with the current technologies used to treat -16 mesh fine coal. The circuit integrated a Floatex hydrosizer, a Falcon concentrator and a Jameson froth flotation cell. The Floatex hydrosizer is being used as a primary cleaner for the nominally -16 mesh Illinois No. 5 fine coal circuit feed. The overflow of the Floatex is screened at 48 mesh using a Sizetec vibratory screen to produce a clean coal product from the screen overflow. The screen overflow is further treated by the Falcon and Jameson Cell. During this reporting period, tests were initiated on the fine coal circuit installed at the Kerr-McGee Galatia preparation plant. The circuit was found to reduce both the ash content and the pyritic sulfur content. Additional in-plant circuitry tests are ongoing.
