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slagging behavior of indonesian coals

Aug 01, 2018 Many Korean coal power plants import Indonesian low rank coal as a feedstock. One of these Indonesian low rank coals, namely SUEK, was chosen for this work. The sewage sludge from a waste water treatment plant was first dried for applying in experimental sample.

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  • Slagging with low rank PRB, Indonesian, and other sub

    Nov 21, 2017 Slagging with low rank PRB, Indonesian, and other sub-bituminous coals Published on November 21, 2017 November 21, 2017 • 46 Likes • 13 Comments

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  • Slag Behavior in Gasifiers. Part I Influence of Coal

    (Mg,Fe)2SiO4 (such as olivine) is also a possible agent and can be used at lower levels than Ca-based components [83]. Vuthaluru and French [84,85] studied the ash deposition behavior of an Indonesian coal and found that ash with a lower glass content and higher crystalline content has a lower tendency to adhere on the deposition probe.

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  • Slagging and Fouling Characteristics of Zhundong High

    Zhundong coal (ZDc) with a large reserve is faced with severe slagging and fouling during combustion in pulverized coal furnaces because of its high Na content. Due to the low-temperature reaction characteristics of a circulating fluidized bed (CFB), the ash-related problems might be alleviated when ZDc is used as fuel in a CFB. In this study, the slagging and fouling characteristics of three ...

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  • Ash chemistry and mineralogy of an Indonesian coal during

    Jun 01, 2008 Combustion tests in closely controlled conditions with a typical Indonesian coal, coal/additive mixtures and washed coal indicated variability in ash character. Among the samples tested, the raw coal + bauxite showed the lowest glass content and high contents of corundum, thus indicating low slagging and fouling propensity.

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  • Improvement of the Coal Ash Slagging Tendency by Coal

    Coal with a high mullite concentration in ash is generally believed to have a high ash fusion temperature (AFT) and low slagging tendency. Conducted by a mineral transition mechanism at high temperature condition, this presented work investigates the improvement of the coal ash slagging tendency by coal washing and additive blending with mullite generation. AFT is considered as the basic ...

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  • Effect of blending sewage sludge with coal on combustion

    Slagging indices including alkali acid ratio (B/A), silicon ratio (G), and silica–alumina ratio (SiO 2 /Al 2 O 3) were also calculated. The results suggest that the slagging behavior of ZDC is greatly reduced even if the blending ratio is only 10%. However, with an increase in the blending ratio, the effect on slagging gradually weakens.

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  • Slagging Behavior of Upgraded Brown Coal and Bituminous

    Jul 17, 2011 The purpose of this study is to quantitatively evaluate behaviors of ash deposition during combustion of Upgraded Brown Coal (UBC) and bituminous coal in a 145 MW practical coal combustion boiler. A blended coal consisting 20 wt% of the UBC and 80 wt% of the bituminous coal was burned for the combustion tests.

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  • A critical review of ash slagging mechanisms and viscosity

    Apr 26, 2020 Gasification or combustion of coal and biomass is the most important form of power generation today. However, the use of coal/biomass at high temperatures has an inherent problem related to the ash generated. The formation of ash leads to a problematic phenomenon called slagging. Slagging is the accumulation of molten ash on the walls of the furnace, gasifier, or boiler and is …

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  • Investigation on Coal Slagging Characteristics and

    using coal slagging assessment tool such as numerical slagging indices. Historical data on coal use according to type and shipment in power plant was use for the analysis.

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  • Initial Slagging Temperature as a Coal Slagging Index

    Sep 16, 2014 The initial slagging temperature represents a combination of various properties of fly ash, does not give a priori preference to any of them, and objectively characterizes the bonding of particles in deposits. Unlike other countries, in our country, this temperature is widely used as a main coal slagging index. This temperature measured in different experimental conditions for the same coal ...

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  • Slag Behavior in Gasifiers. Part I Influence of Coal

    ratio) all affect slagging behavior. Because coal has varying ash content and composition, ... behavior of an Indonesian coal and found that ash with a lower glass conten t and higher crystalline .

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  • Slag Behavior in Gasifiers. Part I Influence of Coal

    (Mg,Fe)2SiO4 (such as olivine) is also a possible agent and can be used at lower levels than Ca-based components [83]. Vuthaluru and French [84,85] studied the ash deposition behavior of an Indonesian coal and found that ash with a lower glass content and higher crystalline content has a lower tendency to adhere on the deposition probe.

    Get Detail
  • Slag Behavior in Gasifiers. Part I Influence of Coal

    In addition, indices (slagging and fouling) based on ash compositions could be used to guide operations and evaluate coal quality for gasification or to describe ash slagging or fouling behavior. There are many proposed indices, but most of them have limited application because they are not based on physical principles.

    Get Detail
  • Improvement of the Coal Ash Slagging Tendency by Coal

    Coal with a high mullite concentration in ash is generally believed to have a high ash fusion temperature (AFT) and low slagging tendency. Conducted by a mineral transition mechanism at high temperature condition, this presented work investigates the improvement of the coal ash slagging tendency by coal washing and additive blending with mullite generation. AFT is considered as the basic ...

    Get Detail
  • Coal Properties and its influence on Boiler Pankaj Ekbote

    Properties of Coal • Coal properties are evaluated by different methods. • The most commonly used methods are Proximate and Ultimate analysis of the coal. • Proximate analysis gives the Moisture, Ash and Volatile matter, while the Fixed Carbon is found by difference. • Ultimate Analysis gives the elemental composition of the coal. • Other methods like Macarel analysis is also used ...

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  • Slagging Behavior of Upgraded Brown Coal and Bituminous

    Jul 17, 2011 The purpose of this study is to quantitatively evaluate behaviors of ash deposition during combustion of Upgraded Brown Coal (UBC) and bituminous coal in a 145 MW practical coal combustion boiler. A blended coal consisting 20 wt% of the UBC and 80 wt% of the bituminous coal was burned for the combustion tests.

    Get Detail
  • A critical review of ash slagging mechanisms and viscosity

    Apr 26, 2020 Gasification or combustion of coal and biomass is the most important form of power generation today. However, the use of coal/biomass at high temperatures has an inherent problem related to the ash generated. The formation of ash leads to a problematic phenomenon called slagging. Slagging is the accumulation of molten ash on the walls of the furnace, gasifier, or boiler and is …

    Get Detail
  • Materials Testing Volume 59 Issue 9 De Gruyter

    Aug 28, 2017 More specifically, the coal slagging behavior inside of coal gasifier/combustors necessitated optimization of the operational conditions for subsequent mild slagging. The currently used coal gasification operation temperature ranges favored mild slagging at 1200 to 1300 C (19.9 to 20.1 bar) and incomplete slagging at 1100 to 1200 C (19.7 to ...

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  • Typical Causes of Slagging and Fouling Problems in Boilers

    Jun 01, 2015 Coal fineness meets the following guidelines: At least 75% passes a 200-mesh screen and less than 0.2% remains on a 50-mesh screen with representative and isokinetically removed coal fineness samples.

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  • (PDF) Slagging and Fouling Propensity Full Scale Tests at

    Bulk Ash Analyses of the Six Pulverized Coalsa problems with slagging in the furnace were observed during coal A coal B coal C coal D coal D/coal E coal E combustion of coal E. SiO2 48.5 61.0 47.1 48.4 48.0 46.1 As expected, the bottom ash is enriched with Fe2O3, espe- Al2O3 25.4 20.4 30.8 26.6 22.8 20.9 cially for the iron-rich coal, coal E ...

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  • 10.1016 j.fuproc.2011.02.016 DeepDyve

    Jun 11, 2020 Kobe Steel, Ltd. has developed an UBC process based on a slurry dewatering technology [1–3] . The UBC stands for Upgraded Brown Coal. Akiyama et al. [4] also evaluated the combustion characteristics of UBC. However, the ash melting points of Indonesian low-rank coals are relatively lower than those of high-rank coals. Therefore, slagging

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  • The chemical composition of tertiary Indian coal ash and

    Aug 28, 2014 A positive relationship between slagging and heating values of the coal has been found in this study. ... Huggins F E, and Dunmyre G R 1981 Investigation of the high temperature behavior of coal ash in reducing and ... and Singh M P 2011 A study on removal of selected major elements from Indonesian coal through bacteria: Environmental ...

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  • Investigation of slagging characteristics and anti

    May 01, 2020 The slagging tendency of Indonesian coal was predicted and analyzed by the thermodynamic equilibrium and the Na 2 O-Al 2 O 3-SiO 2 ternary phase diagram calculations by FactSage 7.2. The migration and conversion of sodium and potassium and the slagging characteristics of Indonesian coal were analyzed. The coal type for blending was determined.

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  • (PDF) Investigation on Coal Slagging Characteristics and

    Nov 14, 2020 the local coal power plant from various countries su ch as Indonesia, South Africa, Australia and etc. ... all affect slagging behavior. Because coal …

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  • Slagging and Fouling Characteristics of Zhundong High

    Zhundong coal (ZDc) with a large reserve is faced with severe slagging and fouling during combustion in pulverized coal furnaces because of its high Na content. Due to the low-temperature reaction characteristics of a circulating fluidized bed (CFB), the ash-related problems might be alleviated when ZDc is used as fuel in a CFB. In this study, the slagging and fouling characteristics of three ...

    Get Detail
  • Ash deposition behavior of upgraded brown coal in

    Jul 01, 2011 An Indonesian UBC and an Australian bituminous coal of Coal A were selected as samples. Those coal properties are shown in Table 1.As seen from the table, the hemispherical temperature for Coal A under oxidizing conditions is 230 K higher than that of the UBC.The prominent features of Coal A are a higher SiO 2 content and lower CaO and Fe 2 O 3 contents in the ash, …

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  • (PDF) A critical review of ash slagging mechanisms and

    slagging behavior of high-rank coals such as anthracite and bituminous coals, due to the abundance and preferential use of these coals for combustion and gasi fi cation [119 –

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  • Slag Behavior in Gasifiers. Part I Influence of Coal

    In addition, indices (slagging and fouling) based on ash compositions could be used to guide operations and evaluate coal quality for gasification or to describe ash slagging or fouling behavior. There are many proposed indices, but most of them have limited application because they are not based on physical principles.

    Get Detail
  • Investigation on the slagging characteristics of high AAEM

    Apr 01, 2021 In order to evaluate the slagging characteristics of lignite with high alkali and alkaline earth metal (AAEM) content under different atmospheres, three Xinjiang coals with similar AAEM compositions and various silica/alumina ratio (R S/A) were used as fuels in this study, namely, QiYa1 coal (QY1c), QiYa2 coal (QY2c), and YiHua coal (YHc).The experiments were carried in a horizontal …

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  • Coal Blending an overview ScienceDirect Topics

    Coal blending is a practice that has been undertaken by many power stations to provide a consistent feedstock of fuel for power generation or to meet different requirements such as solving transportation problems, fuel cost, reducing slagging and SO x emission. 133, 134 In Coal Blending for Power Stations, Carpenter 135 listed the other reasons ...

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  • Understanding slagging and fouling in pf combustion

    @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.

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