ash fusion temperature of coal

    ash fusion temperature of coal

    Ash Fusion Temperature - an overview ScienceDirect Topics

    Bruce G. Miller, in Clean Coal Engineering Technology, 2011. Ash Fusion. The ash fusion temperature is a measure of when the ash will melt and transform from a solid to liquid state. This temperature is an important parameter for the design and operation of gasification systems, for those that operate below the ash fusion temperature so as not to incur fusion, sintering, or clinkering of the

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    Coal assay - Wikipedia

    OverviewSpecial combustion testsChemical properties of coalPhysical and mechanical propertiesCoal classification by rankExternal links

    Aside from physical or chemical analyses to determine the handling and pollutant profile of a coal, the energy output of a coal is determined using a bomb calorimeter which measures the specific energy output of a coal during complete combustion. This is required particularly for coals used in steam generation. The behaviour of the coal's ash residue at high temperature is a critical factor in selecting coals for steam power generation. Most furnaces are designed to remove ash as a powdery residue. Coal which has as

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    Ash Fusion Temperatures

    Ash fusion temperatures give an indication of the softening and melting behavior of fuel ash. These temperatures are widely cited in fuel specifications for boilers despite a relatively poor record of correlating with slagging or fouling behavior.

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    Relationship between coal ash composition and ash fusion

    1. Introduction. The coal ash fusion temperature (AFT) is an important parameter on coal ash fouling and slagging properties. It determines the behavior of coal ash in the processes of coal combustion, gasification, liquefaction and ash utilization , , .It can cause slagging problems on combustion chamber and pipe surfaces and decline heat transfer efficiency , .

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    Effect of Coal Ash Composition on Ash Fusion Temperatures

    The ash fusion temperatures (AFTs) of coal mineral matter at high temperature are important parameters for all gasifiers. Experiments have been conducted in which mixtures of selected coal ashes and SiO2, Al2O3, CaO, Fe2O3, and MgO were subjected to the standard test for ash fusibility. The computer software package FactSage has been used to calculate the liquidus temperatures of coal ash

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    Cited by: 148

    What is the effect of ash fusion temperature of coal in

    If the ash fusion temperature is low say 1000 degree celsius it may be helpful for binding of coal and coke. Higher ash fusion temperature also should help in binding whish is arequirement for

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    Analysis of Coal Ash

    • Ash chemistry. • Ash petrography. • Ash resistivity. ASH TESTING ASH FUSION Understanding the behavior of coal ash at high temperature is critical in determining ideal coals for steam power generation. The ash fusion test gives an indication of the softening and melting behavior of coal ash at high temperatures within the boiler.

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    Understanding the Business of Coal - Ash Fusion

    Jul 24, 2017  Coal Slags and Ash Fusion Temperatures The Ash Fusion Temperature, AFT, test became popular in the 1920’s as a way to judge clinkering

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    Ash Fusion Tester Ashing combustion analysis

    Ash Fusion Tester can be used for ashing to combustion analysis the four characteristic temperatures (Deformation Temperature - DT, Softening (Sphere) Temperature - ST, Hemisphere Temperature - HT amp;Flow (Fluid) Temperature - FT) of coal and coke ash. ,IMP

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    Understanding the Business of Coal - Ash Fusion

    Jul 24, 2017  Coal Slags and Ash Fusion Temperatures The Ash Fusion Temperature, AFT, test became popular in the 1920’s as a way to judge clinkering

    More

    Ash Fusion Tester Ashing combustion analysis

    Ash Fusion Tester can be used for ashing to combustion analysis the four characteristic temperatures (Deformation Temperature - DT, Softening (Sphere) Temperature - ST, Hemisphere Temperature - HT amp;Flow (Fluid) Temperature - FT) of coal and coke ash. ,IMP

    More

    Prediction of coal ash fusion temperatures using

    The coal ash fusion at a low temperature, encourages the formation of a clinker that gathers around the heat transfer pipes and thereby corrodes the furnace components. It is well-known that the ash clinkering may lead to channel burning, pressure drop, and an unstable gasifier operation (Van Dyk et al.

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    Correlation between the critical viscosity and ash fusion

    The extent of coal ash slag penetration and refractory brick dissolution depends on the slag viscosity, the gasification temperature, and the composition of slag and bricks. We measured the viscosity of several synthetic coal ash slags with a high-temperature rotary viscometer and their ash fusion temperatures through optical image analysis.

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    Effect of Coal Ash Composition on Ash Fusion Temperatures†

    The ash fusion temperatures (AFTs) of coal mineral matter at high temperature are important parameters for all gasifiers. Experiments have been conducted in which mixtures of selected coal

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    Coal Properties, Sampling Ash Characteristics

    relationship to coal ash chemistry, melting slagging properties, and fusion temperature. There are not distinct melting points for coal ash like with or other pure compounds, s o when melting is mentioned it is used to represent a decrease in viscosity, rather than a melting point. When coal ash melts it occurs on both a large scale and a

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    Ash fusion temperature - Page 1 of 3

    Apr 08, 2011  Re: Ash fusion temperature. Dear Mr.Ted, As per my understanding the higher the ash fusion temperatures better will be its performance in terms of fouling and slagging in power plant boiler tubes. High alkali containing fly ashes generally do have low ash fusion temperatures.Indonesian coal which is largely used in power plants.

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    Chemical and Specialty Coal, Kentucky Geological Survey

    Other properties. Low ash-fusion temperature: The mineral fraction of the Blue Gem is dominated by siderite, rather than silicates. This gives the coal a low ash-fusion temperature that is favorable in the production of silicon metal (Gardner and others, 2007; Hower and others, 2007).

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    Ash Fusion, Coal Analysis, Kentucky Geological Survey

    Ash fusion, also called fusibility, is a test to determine how the ash residue remaining from combustion of a coal will react in a furnace or boiler. In this test, coal ash is put into conical molds as specified in ASTM method D1857-04 guidelines and procedures (American Society

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    Standard Test Method for Fusibility of Coal and Coke Ash

    5.1 The design of most coal combustion and coal conversion equipment anticipates that the ash either remain solid or assume some degree of fluidity, depending on the particular design. Ash fusibility temperatures help predict whether the ash will perform properly in the process for which the coal

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    Challenges of Burning PRB Coal - boilercleaning

    The elevated temperatures of the gas leaving the furnace often results in ash entering the convection passes that is above its fusion temperature. Thus this ash will deposit on the superheat and reheat surfaces and further reduce the ability of the furnace to make steam conditions.

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    Chemical Analyses and Physical Properties of 12 Coal

    forms of sulfur, ash-fusion temperatures, free-swelling index, and real specific-gravity determinations for 12 coal samples from Virginia and West Virginia_____ 10 3. Major and minor oxide and trace-element composition of the oratory ash of 12 coal samples from Virginia and West Virginia_____ 16

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    Ash Fusion and T250 Testing Equipment

    Ash-fusion furnace system. MTI’s LECO ash-fusion furnace system is used to measure ash-fusion temperatures and slag-flow behavior under controlled atmospheres. Ash-fusion temperatures. MTI measures four conventional ash-fusion temperatures (AFTs) determined under oxidizing or reducing conditions (ASTM standard D1857).

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    CORRELATION BETWEEN ASH FUSION TEMPERATURES (AFT)

    Sep 09, 2014  In the present investigation, few Indonesian coal samples have been selected to find out the direct effect of ash chemical composition and ash fusion temperatures. Experimental: The composition of several coal ashes were determine by ASTM D6349-09 method using Perkin Elmers Optima 700 DV, ICP-OES. The sample digestion was carried out in a

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    Chemical Analyses and Physical Properties of 12 Coal

    forms of sulfur, ash-fusion temperatures, free-swelling index, and real specific-gravity determinations for 12 coal samples from Virginia and West Virginia_____ 10 3. Major and minor oxide and trace-element composition of the oratory ash of 12 coal samples from Virginia and West Virginia_____ 16

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    CORRELATION BETWEEN ASH FUSION TEMPERATURES (AFT)

    Sep 09, 2014  In the present investigation, few Indonesian coal samples have been selected to find out the direct effect of ash chemical composition and ash fusion temperatures. Experimental: The composition of several coal ashes were determine by ASTM D6349-09 method using Perkin Elmers Optima 700 DV, ICP-OES. The sample digestion was carried out in a

    More

    Challenges of Burning PRB Coal - boilercleaning

    The elevated temperatures of the gas leaving the furnace often results in ash entering the convection passes that is above its fusion temperature. Thus this ash will deposit on the superheat and reheat surfaces and further reduce the ability of the furnace to make steam conditions.

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    coal utilization Volatile Matter Britannica

    The amount and nature of the ash and its behaviour at high temperatures affect the design and type of ash-handling system employed in coal-utilization plants. At high temperatures, coal ash becomes sticky (i.e., sinters) and eventually forms molten slag. The slag then becomes a hard, crystalline material upon cooling and resolidification.

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    Development of a LIBS system for prediction of ash fusion

    losses). Information on coal elemental composition, and some other characteristics of the coal, like ash fusion temperatures, can help make decisions on these operational actions. The coal-ash fusion temperature is a parameter widely used as a slagging propensity index of coal. However, this type of information is not typically provided to

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    AF700 Ash Fusion Analyzer from LECO Labcompare

    The AF700 Ash Fusion Determinator automatically monitors ash cone deformation temperatures in coal ash, coke ash, and mold powders using Windows-based software. It increases oratory throughput using predefined ash fusibility temperatures (IT, ST, HT, and FT) automatically determined by the software's Image Recognition Functions (IRF).

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    Correlating The Slagging of A Utility Boiler With Coal

    CORRELATING THE SLAGGING OF A UTILITY BOILER WITH COAL CHARACTERISTICS Rod Hatt Coal Combustion, Inc. Versailles, KY 859-873-0188 ABSTRACT This will describe how a utility was able to correlate intermittent slagging problems a boiler was experiencing with coal ash chemistry. The coal ash fusion temperatures alone were not sufficient to be

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    Ash Analysis Energy SGS

    SGS proximate coal ash analysis servs include: Ash Fusion. An SGS ash fusion test gives you an indication of the softening and melting behavior of coal ash at high temperatures within the boiler. Critical ash softening temperatures are determined by monitoring the increasing deformation of the sample as it is heated.

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    Bituminous Coal Characteristics and Applications

    Bituminous coal can be categorized further by the level of volatile matter; it contains high-volatile A, B, and C, medium-volatile, and low-volatile. Volatile matter includes any material that is liberated from the coal at high temperatures. In the case of coal, the volatile matter may include sulfur and hydrocarbons.

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    Ash Fusion and T250 Testing Equipment

    Ash-fusion furnace system. MTI’s LECO ash-fusion furnace system is used to measure ash-fusion temperatures and slag-flow behavior under controlled atmospheres. Ash-fusion temperatures. MTI measures four conventional ash-fusion temperatures (AFTs) determined under oxidizing or reducing conditions (ASTM standard D1857).

    More

    5E-AF4115 Ash Fusion Determinator - YouTube

    Apr 05, 2017  5E-AF4115 Ash Fusion Determinator is used to determine ash cone deformation temperatures in coal ash, coke ash and mold powders automatically, which are critical to the boiler functioning properly

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    Coal Quality Testing Lab Biofuels Testing Sigmatest

    Ash Fusion Temperature: The behavior of coal’s ash residue at high temperature is a critical factor in selecting coals for steam power generation. Most furnaces are designed in a manner that can remove ash residue. Coal ash that converts into a clinker which is hard y slag is usually requires cleaning and is unsatisfactory.

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    Ash Fusion Temperature Brochure-jws comments-3.ppt

    Ash Fusion Temperature ARCH CEN T THE CONCEPT The Energy Research Company (ERCo) and the Lehigh University Energy Research Center (ERC) team have developed a system for on-line, in-situ, real-time measurement of coal properties. The system includes artificial intelligence (AI) models to accurately predict the slagging propensity of coal and

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    Model PAF 2014 Coal Ash Fusion System - Preiser Scientific

    The Preiser Scientific Ash Fusion System is designed to determine ash cone deformation temperatures in coal and coke ash per ASTM Standard D-1857 and ISO Standard 540 (CO/CO2 reducing atmosphere option). The Model PAF 2014 is comprised of a

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    Coal Quality Testing Lab Biofuels Testing Sigmatest

    Ash Fusion Temperature: The behavior of coal’s ash residue at high temperature is a critical factor in selecting coals for steam power generation. Most furnaces are designed in a manner that can remove ash residue. Coal ash that converts into a clinker which is hard y slag is usually requires cleaning and is unsatisfactory.

    More

    Ash Fusion Temperature Brochure-jws comments-3.ppt

    Ash Fusion Temperature ARCH CEN T THE CONCEPT The Energy Research Company (ERCo) and the Lehigh University Energy Research Center (ERC) team have developed a system for on-line, in-situ, real-time measurement of coal properties. The system includes artificial intelligence (AI) models to accurately predict the slagging propensity of coal and

    More

    Model PAF 2014 Coal Ash Fusion System - Preiser Scientific

    The Preiser Scientific Ash Fusion System is designed to determine ash cone deformation temperatures in coal and coke ash per ASTM Standard D-1857 and ISO Standard 540 (CO/CO2 reducing atmosphere option). The Model PAF 2014 is comprised of a

    More

    Re: Ash fusion temperature - Page 2 of 3

    May 08, 2011  re Re: Ash fusion temperature. Dear sir, Pl send me formula for calculation on ( [email protected]) Can we used for calculation for pet coke ash fusion temp . Any relation of high sulphur coal have low fusion temp. With regards. gks. Reply

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    AF700 Ash Fusion Determinator with Automatic Monitoring

    LECO offers the advanced AF700 Ash Fusion Determinator that uses Windows-based software to automatically check the temperatures of ash cone deformation in mold powders, coke ash, and coal ash.. The system improves oratory throughput by employing predefined ash fusibility temperatures, such as HT, ST, IT, that are automatically measured by Image Recognition Functions in the software.

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    Predicting Coal Ash Fusion Temperature of South

    Predicting Coal Ash Fusion Temperature Of South Sumatera’s David Bahrin Blended Coal With Coal Blending Simulation And Laboratory Analysis SISEST 2009 - RUSNAS PEBT AI X - 3 Figure 3. Ash fusion temperature of blended coal samples from the results of oratory analysis. From figure 3, ash fusion temperature for all

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    1.2 Anthracite Coal Combustion

    Typically coal rank increases as the amount of fixed carbon increases and the amount of volatile matter decreases. Anthracite coal is a high-ranking coal with more fixed carbon and less volatile matter than bituminous, subbituminous, or lignite varieties. Anthracite also has higher ignition and ash fusion temperatures.

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    Effect of Coal Blending on Ash Fouling and Slagging in

    ash of high melting-points would not increase the ash fusion temperatures above a certain blending ratio. The significant variation in the chemistry and mineralogy of the ash as a result of coal blending and mineralogical interactions was the main reason for the changes to the ash sintering and fusion

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    Coal Properties and its influence on Boiler Pankaj Ekbote

    • Other methods like Macarel analysis is also used for coal classification and evaluation of coal properties. • Fusion characteristics of Ash is estimated from the Initial Deformation Temperature, Hemispherical Temperature and Fusion Temperature of the ash • Ash oxide analysis is commonly used for analysis of ash composition.

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    Factors Influencing Slagging and Fouling

    Ash Fusibility. Fusion temperatures provide an indication of the temperature range over which portions of the ash will be a molten fluid or semi-molten, plastic state. High fusion temperatures indicate that ash released in the furnace will cool quickly to a nonsticky state resulting minimal potential for slagging.

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    What is ash fusion temperature? - Quora

    Mar 28, 2018  Ash fusion temperatures are determined by viewing a molded specimen of the coal ash through an observation window in a high-temperature furnace. The ash, in the form of a cone, pyramid or cube, is heated steadily past 1000 °C to as high a temperat

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    Welcome to Coalstandards

    Ash Fusion Standard. Certified Reference Materials and Calibration Standards for Coal and Coke Laboratories VS7-001 AFT in coal ash. 15 g SRM is a calibration standard for Ash Fusion Temperatures in both reducing and oxidizing atmospheres. Vanguard Solutions, Inc. P.O. Box 1970

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    Coal Sampling and Analysis Standards

    Coal sampling and analysis standards 8 4.4.1 Preparation of coal ash 58 4.4.2 Major and minor elements 59 4.4.3 Trace elements 61 4.5 Miscellaneous analysis 64 4.5.1 Chlorine 64 4.5.2 Mercury 65 4.5.3 Mineral matter in coal 66 4.5.4 Ash fusibility 66 4.5.5 Coal

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    2002CRABS..55f..61V Page F61 - Harvard University

    Title: Relations between Ash-Fusion Temperatures and Chemical and Mineral Composition of Some Bulgarian Coals Authors: Vassileva, G. C. Vassilev, S. V. Journal: Comptes Rendus de l'Academie Bulgare des Sciences, vol.55, p.6:61 Bibliographic Code: 2002CRABS..55f..61V.

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