ash fusion temperature of coal

Regulation of ash fusion behaviors for high aluminum coal

However to ensure that ash is discharged in a melting state after gasification the flow temperature FT of ash is required to be lower than 1380 176 C 5 6 However the reserves of high ash fusion temperature AFT FT >1400 176 C coal are huge accounting for about 57 in China 7 The AFTs were mainly depending on the operating conditions...

Ash Fusion Temperature

Bruce G Miller in Clean Coal Engineering Technology Second Edition 2017 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...

Ash fusion temperature

Apr 08 2011 0183 32 Re Ash fusion temperature Dear MrTed 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 tub High alkali containing fly ashes generally do have low ash fusion temperaturIndonesian coal which is largely used in power plants...

Re Ash fusion temperature

May 08 2011 0183 32 re Re Ash fusion temperature Dear sir Pl send me formula for calculation on girish_1966 yahooin 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...

Coal Properties Sampling Ash Characteristics

Although the cost of ash chemistry is higher than fusion tests the information obtained is well worth the expense The fusion temperature test is a lower cost technique with reasonable turnaround time Fusion temperatures have been used for years and are contained in most coal contracts Unfortunately fusion temps...

Chemical and Specialty Coal Kentucky Geological Survey

Oct 07 2019 0183 32 Low ash-fusion temperature The mineral fraction of the Blue Gem is dominated by siderite rather than silicat 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...

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 and...

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 gasiļ¬er operation Van Dyk et al 2001 Thus coal-based power stations...

Ash fusion Temperature Testing of Coal

Aug 20 2020 0183 32 Detailed information and testing method Ash fusion temperature of coal...

Analysis of Coal Ash

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 a...

Prediction of coal ash fusion temperatures using

The ash fusion temperatures AFTs signify the temperature range over which the ash deposits are formed on the heat absorbing surfaces of the process equipment Thus for designing and operating the coal-based processes it is important to have mathematical models predicting accurately the four types of AFTs namely initial deformation...

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...

Understanding the Business of Coal Ash Viscosity and T

Aug 17 2017 0183 32 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...

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...

CORRELATION BETWEEN ASH FUSION TEMPERATURES AFT

Sep 09 2014 0183 32 In the present investigation few Indonesian coal samples have been selected to find out the direct effect of ash chemical composition and ash fusion temperatur 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...

The Fusibility of Coal Ash Johnson Matthey Technology Review

In the operation of large solid-fuel boiler installations the fusion characteristics of the coal or coke ash are an important factor If fusion and coagulation of the ash occur trouble will be met in the raking of the boiler and serious blockages may result Standard testing procedures for observing the fusion...

AN UNDERSTANDING OF THE SLAGGING BEHAVIOUR OF COAL

Nov 12 2019 0183 32 Fusion temperature accounts for the behavior of the ash as a whole and slagging occurs at different portions of the boiler with varying chemical compositions related to the ash Viscosity measurements of molten coal ash and the determination of the critical viscosity temperature is of significant importance in this regard as it can provide a...

Ash analyses of bio

Jan 12 2021 0183 32 The ash fusion temperature AFT of the raw coal and bio-coal briquette ashes are shown in Table 3 The AFT is a major factor that is currently used to evaluate the melting and fusibility...

Coal assay

Coal assay - Wikipedia...

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 ia and West ia_____ 10 3 Major and minor oxide and trace-element composition of the laboratory ash of 12 coal samples from ia and West ia_____ 16...

PDF Predicting coal ash fusion temperature with a back

Coal with a low ash fusion temperature promotes clinker which accumulates around the heat transfer pipes and leads to the corrosion of furnace components Usually power stations shut down periodically to remove the clinker from heat transfer pipes and ash recovery shut...

Understanding Pulverized Coal Injection in Blast Furnace

Oct 21 2018 0183 32 Blockages are mostly due to the coal being heated to a temperature where they become sticky and adhere to the surface of the injection lances and tuyer Ash deposition is minimized by utilizing coal with a high ash fusion temperature AFT For all practical purposes the AFT is to be 50 deg C higher than the hot blast temperature...

Indonesian Steam Coal

Indonesian Steam coal The moisture content is high the high volatility the low ash calorific values between 5100-6500 kilocalorie/Kg We also have available from time to time GCV 6700 Both Single / Purecoal and or Blended is available Ash Fusion Temperature IDT...

Influence of Coal Quality and Boiler Operating Conditions

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 temperatur Designed for stoker furnaces Many deficiencies when used for evaluation of slagging or fouling deposits in pulverized coal furnac...

Effect of Chemical Compositions on Ash Fusibility

The ash melting temperature of coal ash has an important effect during the fluidized bed combustion and gasification process which affects the slagging and deposition characteristics of the boiler Experiments on the effects of chemical components on the ash fusion behaviors have been completed on the ash fusion temperatures AFTs analyzer...

Prediction of Chinese Coal Ash Fusion Temperatures in Ar

The ash fusion temperatures AFTs of 21 typical Chinese coal ash samples and 60 synthetic ash samples were measured in Ar and H2 atmospher The computer software package FactSage was used to calculate the temperatures corresponding to different proportions of the liquid phase and predict the phase equilibria of synthetic ash sampl Empirical liquidus models were derived to correlate the...

Prediction of Coal Ash Fusion Temperature by Least

Apr 23 2010 0183 32 Coal ash fusion temperature AFT is one important parameter for coal-fired boiler design and evaluation in a power plant The relationship between coal AFT and the chemical composition of coal ash is rather complex in nature and makes the modeling of AFT difficult In this work a least-squares support vector machine LS-SVM model which was based on a dynamically optimized...

Ash Analysis SGS South Africa

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...

Fuel Ash Corrosion

Whether the fuel burned is oil or coal and whether the corrosion location is in the furnace at temperatures of 500 o-700 o F or the high-temperature components at a metal temperature above 1 000 o F the corrosion mechanisms are similar Constituents within the ash form a low-melting-point species or a mixture of several compounds that has...

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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