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 (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 ...

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Coal Ash Fusion Temperatures — New Characterisation ...

The well-documented shortcomings of the standard technique for estimating the fusion temperature of coal ash are its subjective nature and poor accuracy. Alternative measurements based on the shrinkage and electrical conductivity of heating samples are therefore examined with laboratory ash prepared at about 800°C in crucibles, as well as ...

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Prediction of coal ash fusion temperatures using ...

2018-9-19  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

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Relationship Between Ash Fusion Temperatures and Coal ...

Turkey. The fusion temperature test has been used to evaluate the melting and slagging behaviour of coal ash for years. However, the coal ash fusion temperatures alone are not sufficient to be able to separate the good versus poor performance of coals. Further investigations about the subject revealed that the iron levels in the coal ash and ...

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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

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Relationship between coal ash composition and ash fusion ...

2013-3-1  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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Ash fusion temperature regulation mechanism of

2019-7-29  The modifications in the low ash fusion temperature (AFT) of Xiangyang coal (XY) were investigated by blending it with three high AFT coals [Jincheng coal (JC), Sunjiahao coal (SJH), and Shajuzi coal (SJZ)], respectively. These three coals all improved XY AFT effectively. With the JC mass ratio varying from 0 to 50%, the AFT of XY/JC gradually increased. The AFT of XY/SJH increased ...

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Ash Fusion, Coal Analysis, Kentucky Geological Survey ...

2019-10-7  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 for Testing and Materials, 2013, p. 431–435).

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The ash fusion characteristics of bamboo and coal co ...

2020-7-3  Co-firing of coal and biomass is a feasible and simple way to convert biomass to energy products around the world [1, 2].However, the ash-related problems such as fouling, slagging and corrosion have a significant influence on co-firing process [].Biomass can change ash fusion temperature of co-firing process [].It affects deposition rates and thermal percentage of ash during co-firing process ...

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Effect of SiO2/Al2O3 on fusion behavior of coal ash at ...

2017-4-1  The fusion behavior of ash and slag is critical for coal selection and operation of boilers and gasifiers, and it is required to understand the ash fusion behavior of coal with different ash composition. The ash fusion behavior can be evaluated by different methods including ash fusion temperature (AFT) test and thermomechanical analysis of ash.

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Coal Ash Fusion Temperatures — New Characterisation ...

The well-documented shortcomings of the standard technique for estimating the fusion temperature of coal ash are its subjective nature and poor accuracy. Alternative measurements based on the shrinkage and electrical conductivity of heating samples are therefore examined with laboratory ash prepared at about 800°C in crucibles, as well as ...

Read More
(PDF) 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.

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Ash Fusion Temperatures - BYU College of Engineering

2011-8-22  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 cooling relative to the bulk gas temperature. Fusion temperatures do not account for either boiler design or boiler operation, both of which ...

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Ash fusion temperature regulation mechanism of

2019-7-29  The modifications in the low ash fusion temperature (AFT) of Xiangyang coal (XY) were investigated by blending it with three high AFT coals [Jincheng coal (JC), Sunjiahao coal (SJH), and Shajuzi coal (SJZ)], respectively. These three coals all improved XY AFT effectively. With the JC mass ratio varying from 0 to 50%, the AFT of XY/JC gradually increased. The AFT of XY/SJH increased ...

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Relationship between coal ash composition and ash fusion ...

The hemispherical temperature (HT) is the most important indicator representing ash fusion temperatures (AFTs) in the Polish industry to assess the suitability of coal for combustion as well as ...

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Effect of sodium and calcium on the ash fusion ...

2020-3-2  The effect of sodium and calcium on the ash fusion temperatures (AFTs) of Zhundong coal was investigated in this study using an ash fusibility tester combined with X-ray diffraction technology. The results indicate that the AFTs of Zhundong coal are closely related to the content of sodium and calcium in coal ash compounds. The pretreatment of the raw coal with water leaching and hydrochloric ...

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The ash fusion characteristics of bamboo and coal co ...

2020-7-3  Co-firing of coal and biomass is a feasible and simple way to convert biomass to energy products around the world [1, 2].However, the ash-related problems such as fouling, slagging and corrosion have a significant influence on co-firing process [].Biomass can change ash fusion temperature of co-firing process [].It affects deposition rates and thermal percentage of ash during co-firing process ...

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Ash fusion temperature - Page 1 of 3

2011-4-8  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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Effect of coal blending on ash fusion behavior for blast ...

2019-10-18  The blast temperature of the BF is up to 1250°C, and the temperature of the tuyere region is 1600-1700°C, which has wide adaptability to the melting temperature of coal ash. 11, 12 However, when the ST of coal ash is lower than 1250°C, the PC is easily wrapped by molten ash during the combustion process, affecting the combustion efficiency ...

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The influence of ashing temperature on ash fouling and ...

2021-11-22  The ash fusion temperatures of different biomass ashes are shown in Table 4. Table 4. Fusion Points of Biomass Ash at Different Ashing Temperatures. The DT, ST, HT, and FT of 815 °C ashes were relatively higher than those of 600 °C ashes, indicating the ash fusion points of biomass ash increased with increasing ashing temperature.

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The ash fusion characteristics of bamboo and coal co ...

2020-7-3  Co-firing of coal and biomass is a feasible and simple way to convert biomass to energy products around the world [1, 2].However, the ash-related problems such as fouling, slagging and corrosion have a significant influence on co-firing process [].Biomass can change ash fusion temperature of co-firing process [].It affects deposition rates and thermal percentage of ash during co-firing process ...

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Effect of Coal Ash Composition on Ash Fusion

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 ...

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The influence of ashing temperature on ash fouling and ...

2021-11-22  The ash fusion temperatures of different biomass ashes are shown in Table 4. Table 4. Fusion Points of Biomass Ash at Different Ashing Temperatures. The DT, ST, HT, and FT of 815 °C ashes were relatively higher than those of 600 °C ashes, indicating the ash fusion points of biomass ash increased with increasing ashing temperature.

Read More
Relationship between coal ash composition and ash fusion ...

The hemispherical temperature (HT) is the most important indicator representing ash fusion temperatures (AFTs) in the Polish industry to assess the suitability of coal for combustion as well as ...

Read More
Ash fusion temperature - Page 1 of 3

2011-4-8  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.

Read More
Study on the ash fusion temperatures of coal and sewage ...

Coal ash is the residual generated from combustion of coal. The ash fusion temperature (AFT) of coal gives detail information on the suitability of a coal source for gasification procedures, and ...

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Ash fusion temperature and crystal composition of multi ...

【Abstract】The ash fusion temperature of coal at high temperature is an important parameter for the efficient and safe operation of coal gasifiers.The equipment of ash fusion temperature was used to measure the ash fusion temperatures of the oxide components composed of SiO 2, Al 2 O 3, Fe 2 O 3, MgO and CaO with different proportions.Five variables composed of Si/Al, Si + Al, Fe 2 O 3, MgO ...

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Effect of sodium and calcium on the ash fusion ...

2020-3-2  The effect of sodium and calcium on the ash fusion temperatures (AFTs) of Zhundong coal was investigated in this study using an ash fusibility tester combined with X-ray diffraction technology. The results indicate that the AFTs of Zhundong coal are closely related to the content of sodium and calcium in coal ash compounds. The pretreatment of the raw coal with water leaching and hydrochloric ...

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The Fusibility of Blended Coal Ash Energy Fuels

2000-2-25  The fusibility of blended coal ash was studied by comparing the standard ash fusibility temperature test, temperatures at particular penetration levels measured by thermomechanical analysis (TMA), and predictions of liquid proportion with temperature thermodynamic equilibrium. Ash fusibility temperatures (AFT) of coal ash are found at temperatures below the predicted liquidus temperature

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AN UNDERSTANDING OF THE SLAGGING BEHAVIOUR OF

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 ...

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