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MINING & CONSTRUCTION

coal slag behavior

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January 2001, Vol. 19 (1) MANAGING SLAG BUILDUP IN COAL ...

incidents of unmanageable slag buildup in the furnace and convective pass slagging have become common. Led by Drs. Carlos Romero, Nenad Sarunac and Richard Conn, the Energy Research Center is involved in two initiatives intended to help utilities control ash slagging. Conn is a specialist in behavior of coal minerals and Romero and Sarunac are ...

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American Institute of Chemical Engineers Journals

Insoo Ye, Changkook Ryu and Ja Hyung Koo, Influence of critical viscosity and its temperature on the slag behavior on the wall of an entrained coal gasifier, Applied Thermal Engineering, 10.1016/j.applthermaleng.2015.05.027, 87, (175-184), (2015).

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Clinker vs Slag - What's the difference? | WikiDiff

Clinker is a see also of slag. As nouns the difference between clinker and slag is that clinker is a very hard brick used for paving customarily made in the netherlands or clinker can be someone or something that clinks while slag is waste material from a coal mine. As a verb slag is to produce slag.

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Slag Behavior in Gasifiers. Part I: Influence of Coal ...

In Part I, we review the main types and the operating conditions of entrained-flow gasifiers and coal properties used in IGCC plants; we identify and discuss the key coal ash properties and the operating conditions impacting slag behavior; finally, we summarize the coal quality criteria and the operating conditions in entrained-flow gasifiers.

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Effect of coal properties and operation conditions on flow ...

8-29-2011 . Effect of coal properties and operation conditions on flow behavior of coal slag in entrained flow gasifier: a brief review . Ping Wang

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Behavior of coal slag during gasification (Journal Article ...

@article{osti_7089224, title = {Behavior of coal slag during gasification}, author = {Bakker, W.T. and Coons, W.C. and Darling, S.L.}, abstractNote = {This paper is based on the operating experience of an atmospheric pressure, two-stage, entrained flow, air-blown slagging gasifier. The paper briefly describes the design and operation of the gasifier, coal slag mineralogy, and the changes in ...

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Kevin Whitty « Chemical Engineering - University of Utah

Kevin Whitty. Home → Department ... "Influence of Isothermal Temperature and Cooling Rates on Crystallization Characteristics of a Synthetic Coal Slag," Fuel 137:193-199 (2014). Clayton, ... K.J., "Investigation of Ash Deposition Behavior during Coal Char-Slag Transition under Gasifying Conditions," Pittsburgh Coal Conference, 20-23 ...

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Coal Bottom Ash/Boiler Slag - Material Description - RMRC

As described in the Coal Bottom AshBoiler Slag Material Description, the use of bottom ash or boiler slag as an unbound granular base is an unencapsulated use and therefore has the …

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(PDF) Computational Fluid Dynamics (CFD) Investigation of ...

Bath Behavior From the CFD analysis of the developed model, a picture of the injection phenomena emerged including jet and coal penetration into the slag bath, quiescent zones, recirculation zones, tuyere gas stream behavior, slag and gas phase velocity distributions, and turbulence behavior.

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coal slag uses - Mine Equipments

Coal Slag is generally used in a pressure or siphon blaster when paint, rust, and scale have to be removed from steel, such as car/truck frames, tanks, heavy ... Slag Behavior in Gasifiers.

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Measurement and simulation of flow properties of coal ash ...

The viscosities of 45 coal ash slag samples at high temperature have been measured under different temperatures and shear rates. The computer thermodynamic software package FactSage has been used to predict liquidus temperatures, volume fractions of crystallized solid particles (ϕ), and the compositions of remaining liquid phase for 45 coal ash slag samples.

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Fuel Processing Technology - Sze Zheng Yong

Modeling the slag behavior in three dimensional CFD simulation of a vertically-oriented oxy-coal combustor Lei Chen, Sze Zheng Yong, Ahmed F. Ghoniem⁎ Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA article info abstract Article history:

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COAL PHYSICAL TESTING

Understanding the behavior of coal ash at high temperature is critical in determining ideal coals for steam power generation. ... for slag fluidity is approximately 250 poise. The temperature at which this occurs is known as the T250 temperature and it can be readily calculated from the

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Preparation of mesoporous silica from coal slag and its ...

A novel mesoporous silica (MS) with the high specific surface area up to 1,199 m 2 /g was prepared from coal slag by SO 3 2− leaching and hydrothermal synthesis. Its application in metal ion removal was explored using Pb 2+, Cu 2+, Co 2+ and Cd 2+ as the model ions.

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Considerations for the Design and Operation of Pilot-Scale ...

The most troublesome coal with plugging by fly-slag at the syngas outlet was Alaskan Usibelli coal from USA that showed an ash fluid temperature of 1,257 o C. Figure 13 shows Alsakan Usibelli coal case of exit line plugging by fly-slag. Contrary to the case of Russian coal where slag viscosity values were more representing the actual behavior ...

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Effect of Slag Melting Behavior on Metal-Slag Separation ...

behavior of metal and slag during carburization reaction. Therefore, purpose of this study is to clarify the effect of slag melting behavior on metal-slag separation behavior by in-situ observation method with a confocal laser-scanning microscope. 2. Experiment In the …

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Molten Slag Flow and Phase Transformation Behaviors in a ...

A slag flow submodel has been developed to simulate the slag flow and phase transformation behaviors in coal gasifiers. The volume of the fluid (VOF) model is used to capture the free surface of the slag flow, and the continuum surface force (CSF) model is employed to calculate the surface tension between the gas phase and the liquid slag phase.

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Simulation of Ash Deposition Behavior in an Entrained Flow ...

Most entrained-flow coal gasifiers are designed to operate at tempera-tures above the ash fusion temperature, in which the ash melts and deposits along the wall, forming a slag layer. Up to 90% of the ash can be discharged as molten slag from the bottom of the furnace or gasifier to a water- quenched slag hopper, where it forms crystal pellets [2].

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Slag Behavior in Gasifiers. Part I: Influence of Coal ...

To improve gasification availability through better design and operation of the gasification process, a better understanding of slag behavior and the characteristics of the slagging process is needed.

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Coal ash behavior in reducing environments - Digital Library

A key factor in the successful design and operation of coal gasification systems is the ability to control and mitigate ash-related problems. Some of the major ash-related problems are slag flow control, slag attack on the refractory, ash deposition on heat-transfer surfaces, corrosion and erosion of equipment materials, and emissions control.

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Ash Fusion and T250 Testing Equipment

An example of the use of additives to modify slag flow behavior is shown below. T250 measurement test NIST Standard Reference Material viscosity calibration Additive for Slag Flow Modification, lb additive per ton of coal

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Influence of Oxygen Partial Pressure on Synthetic Coal ...

The infiltration characteristics of synthetic coal slag into Al 2 s 3 refractory material with a temperature gradient induced along the slag's penetration direction were investigated with respect to time and oxygen partial pressure of the experimental atmosphere. Synthetic slag, which is representative of an average of the ash contents from United States coal feedstock, was melted in either an ...

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Crystallization of synthetic coal-petcoke slag ...

@article{osti_1036451, title = {Effect of Coal Properties and Operation Conditions on Flow Behavior of Coal Slag in Entrained Flow Gasifiers: A Brief Review}, author = {Wang,Ping and Massoudi, Mehrdad}, abstractNote = {Integrated gasification combined cycle (IGCC) is a potentially promising clean technology with an inherent advantage of low emissions, since the process removes contaminants ...

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American Coal Ash Association

The American Coal Ash Association, established in 1968, is a nonprofit trade association devoted to recycling the materials created when we burn coal to generate electricity. Our members comprise the world's foremost experts on coal ash (fly ash and bottom ash), and boiler slag, flue gas desulfurization gypsum (FGD or "synthetic" gypsum), and ...

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Fuels and Materials Research Laboratory | Energy ...

The Fuels and Materials Research Laboratory (FMRL) works with project scientists and engineers at the EERC to analyze coal and other fuels, determine the physical properties of coal ash and other ceramic materials, and test the utility of coal ash as a valuable by-product of coal utilization.

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PHYSICAL AND COMPUTATIONAL STUDIES OF SLAG …

Slag is crystalline mineral matter in either the molten or solid form and is the byproduct of many processes including coal combustion, coal gasification, and steel manufacturing. In solid form, slag is a brittle crystalline structure with dark coloration. Slag often contains entrapped bubbles of gas. These bubbles are entrapped while the slag

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25 lbs. Coal Slag Blasting Abrasive - The Home Depot

This item: 25 lbs. Coal Slag Blasting Abrasive. Product Overview. Coal Slag abrasive is a fast cutting, economical abrasive used to remove heavy rust, scale or paint from steel and other hard surfaces. This abrasive is typically used in a pressure blaster or siphon blaster where the abrasive is not being recycled. Coal Slag is moisture ...

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Coal vs Slag - What's the difference? | WikiDiff

As nouns the difference between coal and slag is that coal is (uncountable) a black rock formed from prehistoric plant remains, composed largely of carbon and burned as a fuel while slag is waste material from a coal mine. As verbs the difference between coal and slag is that coal is to take on a supply of coal (usually of steam ships) while slag is to produce slag.

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Effects of atmosphere on the oxidation state of iron and ...

 · Viscosity behavior of coal ash slag in the slagging gasifier is the key for the stable operation. The oxidation state of iron in the slag is sensitive to the gas chemistry, which influences the viscosity behavior. The atmosphere in the gasifier varies from weak oxidizing to strong reducing, and the effect on slag viscosity behavior is still not ...

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Behavior of Steel Furnace Slag, Coal Wash, and Rubber ...

 · The influence of rubber crumbs on the dilatancy behavior and critical state of steel furnace slag (SFS), coal wash (CW), and rubber crumbs (RC) mixtures was investigated via a series of monotonic drained triaxial tests.

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