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ash fusion temperature of coal

Ash Fusion Temperature an overview ScienceDirect Topics

D. Zhang, in Ultra-Supercritical Coal Power Plants, 2013. 6.5.3 Thermodynamic equilibrium calculations. Thermodynamic equilibrium calculations or equilibrium phase diagrams are also used to provide information on the properties of coal ash or ash deposits, such as mineralogy, ash fusion temperatures (AFTs) and viscosity, or to predict the behaviour of coal ash during combustion. 27, 94, 106get price

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Ash Fusion Temperatures BYU College of Engineering

Fusion temperatures are based on fuel ash whereas deposits commonly are enriched and depleted in several elements relative to the fuel. Fusion temperatures are measured over short time periods while heating ash at a rate of 8 +/- 3 ºC (15 +/- 5 ºF) per minute whereas ash deposits typically accumulate for hours and are formed during coolingget price

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Coal assay Wikipedia

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 asget price

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Relationship between coal ash composition and ash fusion

Mar 01, 2013· 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,.get price

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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 SiO 2, Al 2 O 3, CaO, Fe 2 O 3, 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 coalget price

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Understanding the Business of Coal Ash Fusion

Jul 24, 2017· The Ash Fusion Temperature, AFT, test became popular in the 1920’s as a way to judge clinkering on the grate of a stoker fired boiler. It was not designed to work on pulverized coal (PC) units.get price

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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 SiO 2, Al 2 O 3, CaO, Fe 2 O 3, 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 coalget price

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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 get price

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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 forget price

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Understanding the Business of Coal, Ash Viscosity and T

Aug 17, 2017· There are several coal boilers and gasifiers that operate with a flame temperature over the melting or fluid properties of the coal ash, commonly called ash fusion temperature, AFT.get price

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Effect of Coal Ash Composition on Ash Fusion Temperatures

Aug 11, 2009· 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 ashget price

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Analysis of Coal Ash SGS

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. Ash fusion temperatures are determined by heating a prepared sample of molded coal in aget price

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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. 2001). Thus, coal-based power stationsget price

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Prediction of coal ash fusion temperatures using

Sep 19, 2018· 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. 2001).get price

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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 get price

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Correlating The Slagging of A Utility Boiler With Coal

The coal ash fusion temperatures alone were not sufficient to be able to separate the good versus poor performing coals. Further investigation revealed that the iron levels in the coal ash, and several indexes such as Base to Acid ratio, slagging factor and iron loadingget price

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Investigating the Effect of Coal Mineral Matter on Blast

•To analyse the ash mineralogy and chemistry using a range of techniques. •To investigate physical and chemical properties of the ash with respect to the injection, combustion, burden interaction and slag chemistry. Hard, high melting point minerals May cause wear in the coal injection zone. Ash fusion temperature Could determine whether ash isget price

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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 laboratory ash of 12 coal samples from Virginia and West Virginia_____ 16get price

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Prediction of biomass ash fusion behaviour by the use of

2.2.1 Ash fusion temperature(AFT) testing Ash fusion tests were carried out in a Carbolite Ash Fusion furnace fitted with a camera and image processing software designed to capture images at preset temperature intervals. The samples were prepared by carefully adding a few drops of demineralised water to the ash toget price

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Influence of Coal Quality and Boiler Operating

Ash fusion temperatures Ash fusion tempe rature tests have been around for almost a century. At first there was just one, then three, and finally we know have four reported fusion temperatures. Designed for stoker furnaces Many deficiencies when used for evaluation of slagging or fouling deposits in pulverized coal furnaces.get price

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Prediction of coal ash fusion temperatures using

Sep 19, 2018· 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. 2001).get price

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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. 2001). Thus, coal-based power stationsget price

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CORRELATION BETWEEN ASH FUSION TEMPERATURES

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 aget price

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(PDF) Predicting coal ash fusion temperature with a back

Predicting coal ash fusion temperature with a back-propagation neural network modelget price

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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.get price

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Prediction of biomass ash fusion behaviour by the use of

2.2.1 Ash fusion temperature(AFT) testing Ash fusion tests were carried out in a Carbolite Ash Fusion furnace fitted with a camera and image processing software designed to capture images at preset temperature intervals. The samples were prepared by carefully adding a few drops of demineralised water to the ash toget price

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Investigating the Effect of Coal Mineral Matter on Blast

•To analyse the ash mineralogy and chemistry using a range of techniques. •To investigate physical and chemical properties of the ash with respect to the injection, combustion, burden interaction and slag chemistry. Hard, high melting point minerals May cause wear in the coal injection zone. Ash fusion temperature Could determine whether ash isget price

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Chemical and Specialty Coal, Kentucky Geological Survey

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).get price

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Ash Fusion and T250 Testing Equipment

Ash-fusion temperatures MTI measures four conventional ash-fusion temperatures (AFTs) determined under oxidizing or reducing conditions (ASTM standard D1857). The AFTs include: 1) initial deformation temperature, 2) softening temperature, 3) hemispherical temperature, and 4) fluid temperature.get price

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Using an on-line elemental coal analyzer for improved

order to estimate the ash fusion temperatures in the coal being sent to the power plant PacifiCorp needed an analyzer that could measure the ash constituents whose proportions determine ash fusion. The Gamma-Metrics Coal Quality Manager (CQM) analyzer from Thermo Electron Corporation provides minute-by-minute analysis of SiO 2, Al 2 O 3, Fe 2 Oget price

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Correlation between the critical viscosity and ash fusion

@article{osti_1240881, title = {Correlation between the critical viscosity and ash fusion temperatures of coal gasifier ashes}, author = {Hsieh, Peter Y. and Kwong, Kyei-Sing and Bennett, James}, abstractNote = {Coal gasification yields synthesis gas, an important intermediate in chemical manufacturing. It is also vital to the production of liquid fuels through the Fischer-Tropsch process andget price

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Ash Analysis Energy SGS

SGS proximate coal ash analysis services 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.get price

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AF700 LECO

Coal and Coke Ash Fusibility Determinator Our AF700 Ash Fusion Determinator increases your laboratory throughput by automatically determining the ash fusibility temperatures (IT, ST, HT, and FT). The state-of-the-art AF700 features improved operational controls, digital archiving ability, integrated safety features, and increased instrumentget price

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Frequently Asked Questions Coal Testing

Ash Fusion Test. The behavior of a 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 ash that fuses into a hard glassy slag known as clinker is usually unsatisfactory in furnaces as it requires cleaning.get price

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