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Namkung, Hueon,Lee, Young-Joo,Park, Ju-Hyoung,Song, Gyu-Seob,Choi, Jong Won,Choi, Young-Chan,Park, Se-Joon,Kim, Joeng-Geun Elsevier 2018 Fuel Vol.225 No.-
<P><B>Abstract</B></P> <P>The co-combustion of sewage sludge and woody biomass is a key issue in coal power plants. Different combustion and ash behaviors of sewage sludge and woody biomass cause unpredictable operating concerns. In this study, the combustion and ash agglomeration behavior of blended fuel of sewage sludge and woody biomass (BSW) were investigated while coal co-combusted with it. Thermogravimetric analysis (TGA) revealed that adding a high amount of BSW into the coal lowered volatilization, ignition, and burn-out temperature. The char combustion reactivity of coal differed from that of BSW. The shrinking core model (SCM) and volumetric reaction model (VRM) were used to fit the char combustion reactivity of coal and BSW. In the case of ash agglomeration behavior, BSW addition led to increasing particle agglomeration at fouling temperatures. In particular, phosphorus composition influenced particle growth, which was verified using scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM–EDX) analysis. Furthermore, the ash mixture ratio of BSW and coal changed the intensity of the phosphorus-bearing mineral phase from X-ray diffraction (XRD) analysis, and finally influenced the melting temperature of the ash.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The combustion and ash agglomeration characteristics of coal and BSW mixture were investigated. </LI> <LI> Addition of BSW into the coal lowered the combustion temperature profiles during non-isothermal heating conditions. </LI> <LI> Carbon and reagent gas reaction occurred on exterior and interior of the particle during char combustion. </LI> <LI> BSW containing high phosphorus contents made a high agglomeration tendency and low melting mineral phase. </LI> </UL> </P>
Namkung, Hueon,Kim, Hyung-Taek,Wang, Fuchen,Lin, Kuangfei,Yu, Guangsuo Springer-Verlag 2017 Korean Journal of Chemical Engineering Vol.34 No.12
<P>Particle stickiness is a key parameter for increasing ash deposition in gasification process. We conducted multilateral investigations to evaluate particle stickiness of coal ash at low temperature fouling conditions through Watt and Fereday's viscosity model, dilatometry (DIL) and laser flash apparatus (LFA) technique. Seventeen coals were employed for ash deposition experiments under gasification condition through drop tube furnace (DTF). The low viscosity not only led to increasing ash deposition behavior, but also increasing the particle size of deposited ash. From DIL analysis, the ash sintering behavior increased with increasing temperature due to increase of particle stickiness. The high amount of Fe2O3, CaO and MgO components resulted in low sintering temperature and high reduction of physical length. Through LFA analysis, the thermal conductivity increased with increasing temperature, because of increasing particle stickiness. In addition, its value was correlated with the propensity of common fouling indices.</P>
Namkung, Hueon,Park, Ju-Hyoung,Lee, Young-Joo,Song, Gyu-Seob,Choi, Jong Won,Kim, Joeng-Geun,Park, Jun-Su,Um, Byung Hwan,Song, Kwang Ho,Park, Se-Joon,Choi, Young-Chan Elsevier 2017 Fuel processing technology Vol.167 No.-
<P><B>Abstract</B></P> <P>The application of biomass resources and sewage sludge is currently the most important issue in the field of coal combustion systems. The main drawback for operating a boiler system is its varied firing characteristics and low heating value. In this study, we have developed new synthetic fuels, namely hybrid sludge fuel (HSF), using coal and sewage sludge impregnated bioliquid (molasses) and evaluated their properties by comparison with conventional fuels. To prepare the HSF, it was treated in a carbonization system at 250°C. Depending on the van Krevelen diagram, the fuel quality of HSF was superior to that of raw bioliquid and sewage sludge. In addition, its fuel characteristic was similar to sub-bituminous and bituminous coal. Thermogravimetric analysis (TGA) indicated only a single-stage combustion pattern for HSF during non-isothermal heating. To clarify the unburned carbon (UBC) content, an ultimate analysis was conducted. The amount of UBC of the HSF was much more than that of sewage sludge, but less than that of coal. To investigate the surface hydrophobicity of HSF, Fourier transform infrared spectroscopy (FT-IR) analysis and a moisture re-adsorption test were carried out. The HSF possessed high hydrophobicity and presented a low moisture re-adsorption rate compared to conventional fuels.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The new synthetic fuel (HSF) using coal and sewage sludge impregnated bioliquid was investigated. </LI> <LI> HSF properties were similar to sub-bituminous and bituminous coal on the van Krevelen diagram. </LI> <LI> HSF showed single-stage combustion characteristics from the thermogravimetric analysis. </LI> <LI> HSF presented higher fuel reactivity in comparison with low reactivity coal. </LI> <LI> HSF had a higher hydrophobicity on the surface. </LI> </UL> </P>
탄산염 광물화 반응의 최적화를 위한 사문석 전처리 특성 연구
남궁훤(Hueon Namkung),장나형(Na-Hyung Jang),이준수(Joon-Soo Lee),허려화(Li-Hua Xu),김형택(Hyung-Teak Kim) 한국에너지기후변화학회 2008 에너지기후변화학회지 Vol.3 No.1
The carbonation reaction of the carbon dioxide and Serpentine in an aqueous have been recently studied. The assessment of the heat treatment was evaluated to be used widely. In this research it was studied to know characteristic of Serpentine through heat treatment. To use FT-IR found out whether the -OH group was removed or not and TGA confirmed weight loss of Serpentine. Also Serpentine was used in experiment less than ~38 ㎛ diameter. Serpentine was treated to improve reactivity at 650℃, for I hour, which was found as the best conditions of heat treatment.
기술 소개 : 중국 화동이공대학 청정석탄기술연구소(ECUST-ICCT)의 분류층 가스화 기술의 현황
남궁훤(Hueon Namkung),허려화(Li-Hua Xu),김형택(Hyung-Taek Kim),Fuchen Wang,Xin Gong,Guangsuo Yu 한국에너지기후변화학회 2016 에너지기후변화학회지 Vol.11 No.1
China, which is the highest coal consumption nation, has promoted large coal gasification projects to obtain the highly efficient clean energy. Many coal gasification plants have been constructed in China by using foreign gasification technologies since 1980 whereas China attempted to develop its own gasification technology due to problems in operation through their applications. The representative among Chinas coal gasification technologies is OMB (Opposed Multi Burner) CWS and SE (Sinopec+ECUST) entrained-flow gasification technology of ECUST-ICCT. Pilot scale gasifier has been studied from 1995 and then 3000 ton/day commercial gasifier was developed in 2015. 44 gasification projects using ECUST technology are conducted. 121 gasifiers are operated or under construction and development in those projects. In particular, OMB CWS gasifiers of 2500 ton/day (×5) have been planned for construction in Valero Energy in Texas, USA in order to produce H2. In this paper, we would like to introduce status of China ECUST-ICCT gasification technology and find current issues in developing Korean gasification technology.