Designing for Extremes of Coal Slagging Tendencies

Low Slagging Coal Ash Moderately Slagging Cool Ash 1,000 Severely Slagging Coal Ash IOO 2100 2200 2300 2400 2500 2600 2700 TEMPERATURE,OF Figure 1. Viscosity of Slag (Oxidizing Atmosphere) The design objective is to set the furnace height from the burner intercept to the

COAL CHARACTERISTICS - Purdue University

CCTR Indiana Center for Coal Technology Research 6 COAL RANK Anthracite coal is a dense, hard rock with a jet- black color & metallic luster. It contains between 86% and 98% carbon by weight, & it burns slowly, with a pale blue flame & very little smoke

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US6883443B2 - Method for reduction of slagging and fouling ...

The present invention is a method for reducing the slagging and fouling of the surfaces of the waterwalls, firebox, superheater, and reheater of the furnace of a coal-fired steam boiler. The process reduces the firebox exit temperature to below the specific ash melting temperature by injecting the following, either alone or in combination, into ports located in the upper section of the firebox ...

blending coal calculator - aProject

coal slagging calculator. comprehensive slagging index of mixed coal mixed coal prices According to the industrial analysis of coal, ash comprehensive index R and coal prices, according to the four coal blending program to calculate the coal price in accordance with the ratio of linear addition to calculate the indiors as shown in table 4 ...

Slagging and Fouling Indices - Coal Tech

Slagging Factor for bituminous ash (Fe 23 O > CaO + MgO <0.6 0.6 to 2.0 2.0 to 2.6 >2.6 T 250 Temperature EC w here >1400 1400 to 1245 1245 to 1120 <1120 Iron Calcium ratio <0.3 or > 3.0 0.3 to 3.0 Iron plus Calcium <10% Slagging Index, EC where max HT is the highest value of the hemisphere ash fusion temperature under reducing or oxidising ...

SLAGGING AND FOULING IN PULVERIZED COAL BOILERS AND ...

Aug 05, 2015· References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015,, SGEM2015 Conference Proceedings, ISBN 978-619- / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 1, 713-718 pp ABSTRACT Boilers with pulverized coal belong to the most widely used technology in the energy industry. These boilers burn pulverized coal with a particle size …

Typical Causes of Slagging and Fouling Problems in Boilers

Jun 01, 2015· Consequently, the sweet spot for the FEGT of a pulverized coal–fueled boiler should be about 2,150F to 2,250F to achieve desired steam temperatures without slagging.

ASSESSMENT OF ASH FOULING AND SLAGGING IN COAL …

Fig. 1. 50 MW coal-fired utility boiler with steam flow rate of 210·103 kg/h: T fe, Tgs, and Tge denote flue gas temperatures at the furnace exit, after the superheaters and after the air heater, respectively. Furnace wall slagging The mass flow rate of live steam is determined in the on-line mode from mass and energy balance equations (Fig. 2).

Analysis of Coal Ash - SGS

leads to increased slagging and fouling problems. Decreasing oxide levels through coal selection based on reliable testing procedures will allow you to control and minimize your slagging and fouling problems. PROXIMATE ANALYSIS Proximate provides a good initial indication of coal or coke quality and composition. A standard proximate

Comparison and Application of Two Mathematical Models in ...

Building a model to predict the state of slag on coal-fired boilers is a good way to optimize the coal combustion and reduce the risk of boiler slag. This paper built new models based on vague sets to predict the state of slag on coal-fired boilers, in which there were six input vectors, which were softening temperature, SiO2-Al2O3 ratio, alkali-acid ratio, percentage of silicon content, the ...

Boiler Slagging - Babcock Power

often with quite different ash analysis and slagging characteri sti cs. Mi Xing coal ash is like mixing metals in a solder. The melting point of solder is not the average of the melting points of the individ- ual metals, but is always lower than any individual melting point. With coal ash this same phenomenon

US8337613B2 - Slagging coal combustor for cementitious ...

Systems, methods and processes teach by specific examples how the cost of sequestering carbon dioxide (CO 2 ) can be totally offset and turned into profits during coal powered electricity generation from revenue and co-benefits. The process is provided whereby fly ash-carbon mixtures, or de-volatilized coal char, or anthracite coal culm is co-fired in an air-cooled, slagging combustor with ...

SLAGGING IN ENTRAINED-FLOW GASIFIERS

the best model will perform. The toolbox includes a slag viscosity prediction calculator with 24 slag viscosity models, and a database of 4124 slag viscosity measurements. Petroleum coke may be used as a fuel for entrained-flow slagging gasification. The slag viscosities of coal, petroleum coke and coal/petroleum coke blends were measured in the

ASH DEPOSIT CHARACTERISTICS OF BLENDED COAL IN COAL ...

slagging. One of the procedures to reduce the risk of fouling and slagging by blending the coal of Pendopo, Palangkaraya, Muara Enim and Samarinda, with the ratio of 25:75, 50:50, and 75:25. The ash deposit tendency is known by analyzing the composition and ash fusion temperature of coal,

Boiler Slagging

Slagging Propensity. The root cause of furnace slagging is actual very simple, slagging will occur if furnace exit gas temperatures (F.E.G.T.) exceeds the fusion temperature of ash from the coal being fired. To ensure operation without slagging, we typically recommend that F.E.G.T. be 100°F to 150°F below the ash softening temperature.

GER-4536 Slagging Mitigation Executive Summary

coal plants due to decreased load, the use of more coal and periodic plant shutdowns needed to clear out the waste. Hayden Unit 1 uses TwentyMile coal, which has caused excessive slagging and higher NOx emissions in the past. A formal test burn was completed in 2005 to determine what modifications would be required to successfully fire this coal.

1. FUELS AND COMBUSTION

The calorific value of coal varies considerably depending on the ash, moisture content and the type of coal while calorific value of fuel oils are much more consistent. The typical Gross Calorific Values of some of the commonly used liquid fuels are given below: 1. Fuels and Combustion Bureau of Energy Efficiency 2 Ch-01.qxd 2/23/2005 11:18 AM ...

Entrained Flow Gasifier R&D at CanmetENERGY

May 06, 2010· coal asphalt heavy oil petroluemcoke biomass wastes igcc hydrogen high value chemicals clean liquid fuels oil sands fuels applications near zero emissions steam slurried or liquid fuel dry fuel oxygen entrained flow slagging gasifier hot gas filtration wet scrubber syngas slag & water fine particulate capture 1.5 metre sample #2. sample #3 ...

Overview of Slagging Coal Combustor Heat Plants DTIC

Overview of Slagging Coal Combustor Systems as Applied to Army Central Heat Plants DTIC by ELECTE Jill E. Davidson DEC241991 i Don K. Hartsock A. Dale Conley D Robert L. Hein D Gary W. Schanche The U.S. Army is interested in increasing its consumption of coal as it is the most reliable domestic source of energy. ...

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Slagging and Fouling in Coal Fired Boilers - Bright Hub ...

Aug 10, 2009· Coal fired boilers experience deposition and slagging depending upon the ash characteristics of ash in the coal being fired. In many cases the operating parameters also play a major role. The molten or partial melting pasty ash deposits in radiant heat transfer surface like boiler furnace is termed as slagging. The sintered ash deposit in the convection region in boiler is called fouling.

AN UNDERSTANDING OF THE SLAGGING BEHAVIOUR OF …

Slagging index of a coal should not exceed 0.6. Higher indices indicate greater tendency to form slag. Equation 4 proposed by Gray and Moore considers an index depending upon the initial deformation temperature and hemispherical temperature obtained from AFT measurements that classifies the coal ash as medium high and hard on the basis of F s ...

Understanding slagging and fouling in pf combustion ...

Aug 01, 1994· @misc{etde_7150895, title = {Understanding slagging and fouling in pf combustion} author = {Couch, G} abstractNote = {This report covers the basics of boiler design, the factors which affect it, the nature of the ash-forming materials present and their transformations in the boiler. The mechanisms of deposition and the properties of the deposits formed are discussed.

The Analysis of Coal and Analysis techniques

The Ash Increases handling costs, affects combustion efficiency and boiler efficiency, reduces handling and burning capacity and may causes clinkering and slagging. 8. Moisture content. Moisture in coal must be transported, handled and stored. Since it replaces combustible matter, it decreases the heat content per kg of coal.

Coal Properties, Sampling & Ash Characteristics

Coal Properties, Sampling & Ash Characteristics by Rod Hatt Coal Combustion, Inc . Versailles, KY 859-873-0188 Introduction The Powder River Coal is classified as sub -bituminous ranked coal. Coal rank is an indication of how much transformation the orig inal plant material has under gone. The American Society for Testing and

Coal PRICE Today | Coal Spot Price Chart | Live Price of ...

Sep 02, 2021· Conversion Coal Price Price; 1 Ton = 1,000 Kilograms Coal Price Per 1 Kilogram 0.25 USD

Boiler Deslagging: Anti-Slagging Technology for Coal Fired ...

Boiler Slagging. Power boilers experience slagging as the molten ash adheres to the surrounding substrates. This is also commonly referred to as slag. The amount of slag is primarily dependent on temperature and the types of coal being used and whether it is anthracite, bituminous coal, subbituminous coal, or lignite.

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Understanding the Business of Coal - Slag Formation and ...

Mar 09, 2017· This is how wet coal can increase slagging. The "Splat Factor" calculation uses the kinetic energy equation KE=mass x velocity squared over two. The velocity use is …