• Title/Summary/Keyword: coal gasification slag

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Effect of Gypsum Mixture on Activation of Coal Gasification Slag (석고 혼입이 석탄가스화 슬래그의 활성화에 미치는 영향)

  • Cho, Hyeon-Seo;Kim, Min-Hyouck;Lee, Gun-Cheol;Cho, Do-Young
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.05a
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    • pp.17-18
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    • 2019
  • In this study, the initial strength reduction of coal gasification slag fine powders was confirmed through previous studies when used in cement formulations. It is also confirmed that the blast furnace slag is mixed with cementitious coal blast furnace slag, which is similar to coal gasification slag, to incorporate gypsum in order to prevent initial strength deterioration. In order to analyze the reactivity of coal gasification slag by desulfurization gypsum, the formation of hydrates and their reactivity at early ages were confirmed by electron microscope. In order to confirm the reactivity, the gypsum samples were prepared with unincorporated type and 2% mixed type. Experimental results showed that 2% of the desulfurized gypsum specimens reacted more actively than the uninjured ones.

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Initial Strength Characteristics of Cementitious Gypsum-Containing Coal Gasification Slag Powder Replacement Cement Mortar (석고 혼입 석탄가스화 슬래그 미분말 치환 시멘트 모르타르의 초기강도 특성)

  • Cho, Hyeon-Seo;Kim, Min-Hyouck;Lee, Gun-Cheol;Cho, Do-Young
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.05a
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    • pp.207-208
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    • 2019
  • In this study, compressive strength was measured to evaluate the initial strength of cement mortar substituted with coal gasification slag containing desulfurized gypsum, and the reactivity of desulfurized gypsum was confirmed. In order to improve the reactivity, 2% gypsum mixed type and gypsum unfedged type specimens were fabricated and the influence of desulfurization gypsum on compressive strength of coal gasification slag and blast furnace slag fine powder replacement cement mortar was compared and confirmed. As a result of the experiment, it was confirmed that the initial compressive strength of the specimen containing the desulfurized gypsum was improved at the initial stage.

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Development of a Pretreatment Process for Coal Gasification Slag to Convert High-quality Aggregates. (고품질 골재 전환을 위한 석탄 가스화 용융슬래그의 전처리 공정 개발)

  • Hu, Yun-Yao;Han, Soo-Hwan;Lim, Gun-Su;Han, Jun-Hui;Kim, Jong;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.122-123
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    • 2021
  • This study examines the performance of pretreatment process system as the initial construction stage of the pretreatment process system to use CGS, a by-product generated in IGCC, as a concrete fine aggregate of construction materials. The process undergoes a grinding process capable of grinding to a predetermined particle size during primary grinding and a sorting plant through sieve grading of 2.5 mm or less for particle size correction. Afterwards, it is hoped that the use of coal gasification slag of Korean IGCC as a fine aggregate for concrete will be distributed and expanded by producing quality-improved CGS fine aggregate using water as a medium for removing impurities and particulates.

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Engineering Properties of Concrete Mock-up Using Coal Gasification Slag as Fine Aggregate. (석탄가스화 발전슬래그를 잔골재로 사용한 콘크리트 Mock-up 부재의 공학적 특성)

  • Han, Jun-Hui;Lee, Young-Jun;Hyun, Seung-Yong;Han, Min-Cheol;Yoon, Ki-Won;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.11a
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    • pp.159-160
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    • 2018
  • In this study, the characteristics of the Mock-up test were reviewed to analyze the applicability of the coal gasification slag (CGS) from the integrated gasification combination Cycle (IGCC) to the concrete fine aggregate. The analysis shows that CGS and crushed sand mix is the best combination of CGS combined with about 50 % of CGS based on the effects of promoting liquidity and strength. This is expected to be a positive factor in securing the strength and flexibility of concrete given the optimal mix of CGS, and may also contribute to the improvement of quality.

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Effect of Using Coal Gasification Slag as Fine Aggregate on Field Applicability of the Concrete through Mock-up Test (Mock up test를 통한 석탄가스화 발전슬래그를 잔골재로 사용한 콘크리트의 현장적용 가능성 분석)

  • Han, Jun Hui;Lee, Young Jun;Hyun, Seung Yong;Han, Min Cheol;Yoon, Ki Won;Han, Cheon Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.11a
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    • pp.21-22
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    • 2018
  • In this study, the characteristics of the Mock-up test were reviewed to analyze the applicability of the coal gasification slag (CGS) from the integrated gasification combination Cycle (IGCC) to the concrete fine aggregate. The analysis shows that CGS and crushed sand mix is the best combination of CGS combined with about 50 % of CGS based on the effects of promoting liquidity and strength. This is expected to be a positive factor in securing the strength and flexibility of concrete given the optimal mix of CGS, and may also contribute to the improvement of quality.

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Reduction of Hydration heat of FA concrete using Coal Gasification Slag for Mixed Fine Aggregate (석탄 가스화 용융 슬래그를 혼합 잔골재로 사용한 FA 치환 콘크리트의 수화열 저감)

  • Han, Jun-Hui;Lee, Young-Jun;Choi, Il-Kyung;Kim, Jung;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.11a
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    • pp.79-80
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    • 2019
  • This study was intended to examine the possibility of reducing hydration heat by FA substitution and combination of slag (CGS) from coal gasification power generation (IGCC) with mixed aggregate for concrete. The analysis results showed good results if liquidity increases as the ratio of CGS increases, air volume decreases, and compressive strength is mixed up to 25% in the residual aggregate. The results showed that the heat of hydration was reduced compared to plain due to the boron content of CGS as the CGS substitution rate increased, but it was larger due to the combination with FA substitution. It was found that the heat of hydration was reduced.

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The Characteristics of Isothermal Conduction Calorimetry and Specific Heat in Coal Gasification Slag (석탄 가스화 용융 슬래그의 비열 및 미소수화열 특성)

  • Han, Jun-Hui;Hu, Yun-Yao;Lim, Gun-Su;Kim, Su-Hoo;Kim, Jong;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.182-183
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    • 2021
  • In this study, This is the result of thermal characteristics analysis to suggest an efficient method of using coal gasification slag(CGS) of byproduct from integrated gasification combined cycle(IGCC). In Specific Heat characteristics, CGS and CS showed similar values. Isothermal Conduction Calorimetry showed that the hydration reaction of cement was retarded when CGS was used. Therefore, it is expected that CGS will be used as an efficient alternative to reducing the hydration heat of mass concrete as a functional aggregate combination.

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Analysis of The Properties of Materials for Utilizing Fine Aggregates for Concrete for Coal Gasification Slag (석탄 가스화 용융 슬래그를 콘크리트용 잔골재로 활용하기 위한 재료 특성 분석)

  • Kim, Su-Hoo;Lim, Gun-Su;Han, Jun-Hui;Hyun, Seung-Yong;Kim, Jung;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.170-171
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    • 2021
  • This study compared the characteristics of the newly established JISA 5011-5 coal gasification slag fine aggregate with the characteristics of CGS generated in Korean IGCC through microscopic analysis. As a result of the study, similar results to K_CGS and J_CGS were found

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Effect of the imported bituminous coal and the domestic anthracite coal mixed with petroleum coke (석유코크스와 혼합된 국내무연탄과 수입유연탄 슬래그의 특성 규명)

  • Kim, Min-Kyung;Oh, Myong-Sook S.
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.10a
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    • pp.230-233
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    • 2008
  • The vanadium rich ash of petroleum coke can give a slagging problem during because of the high melting point of $V_2O_3$. For continuous removal of the slag, petroleum coke is often mixed with coal, and the viscosity of the mixed slag is an important property, determining the gasification temperature. The viscosities of the mixed slag from various mixing ratios of petroleum coke and a bituminous coal were investigated. When mixed with a crystalline coal slag, $T_{cv}$ was increased at a higher the coke content in the mixed feed. When the $V_2O_3$ concentration was greater than 4.5%, it was difficult to get accurate measurements of $T_{cv}$. The SEM/EDX analyses of the cooled slag revealed that the major crystalline phase was anorthite, and $T_{cv}$ should be related to the formation temperature of anorthite. The SEM/EDX analyses also showed that, at low concentrations of vanadium, part vanadium formed a crystalline phase with Al-Si-Ca-Fe, and the rest remained in the glassy phase, suggesting that vanadium existed as a slag component at the low viscosity region. At a high concentration, vanadium forms a phase with Ca, and the Ca-V phase was separated from the slag phase, and formed a layer above the slag. FeO in petroleum coke also played an important role determining viscosity: at high temperatures, increased FeO lowered the viscosity, but as it formed a spinel phase, the depletion of FeO in the slag resulted in a higher viscosity.

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A Study on the Fundamental and Heat of Hydration Properties of Fly Ash Replacement Concrete Mixed with Coal Gasification Slag for Fine Aggregate (석탄 가스화 용융 슬래그를 잔골재로 사용하는 플라이애시 치환 콘크리트의 기초적 특성 및 수화열에 관한 연구)

  • Han, Min-Cheol;Choi, Il-Kyung
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.36 no.1
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    • pp.155-162
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    • 2020
  • The aim of the research is to investigate the fundamental properties and heat of hydration reducing performance of the fly ash incorporated concrete mixture when the coal gas slag (CGS) from integrated gasification combined cycle (IGCC) is used as fine aggregate. From the results of the experiment, the workability was generally increased and the air content was decreased up to one to four percent with increasing the replacing ratio of CGS to fine aggregate. The compressive strength was similar or increased within five percent to the Plain mixture when the CGS was used as a fine aggregate. When the CGS and fly ash were used same time, the heat of hydration reducing performance was improved than single using cases either CGS or fly ash. Based on the results, for the concrete mixture using CSG as a portion of the combined fine aggregate, the general properties were improved and heat of hydration was decreased approximately 16 % when the fly ash was replaced 30 % to cement and the CGS was replaced less than 50 % to fine aggregate.