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RISS 인기검색어
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- 저자 : Fuchen Wang (검색결과 6 건)
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Wang, Zhaozhi,Jia, Fuchen,Galea, Edwin Richard,Choi, Jun-Ho Elsevier 2017 Fire safety journal Vol.91 No.-
<P><B>Abstract</B></P> <P>Coupled fire and evacuation computer simulations are used to numerically reconstruct a fatal fire that occurred in an indoor shooting range in Korea in 2009. Of the 16 occupants, 15 were killed and one survived. The analysis demonstrates that this approach can accurately reproduce the outcome of this fire. The approach is then used to forensically analyse the incident to identify factors significantly contributing to the high loss of life. In particular, occupant response times and flame spread rate over the polyurethane foam (PUF) cladded walls are investigated. The results suggest that it is unlikely that anyone could have survived if response times were greater than 5s. Furthermore, it is suggested that fatalities couldn't have been avoided even if response times were zero. It is also demonstrated that gunpowder residue on the PUF walls is the critical factor in producing the high loss of life. The average number of fatalities could be reduced from 14.9 in the reconstruction case to 0.1 if the walls are completely free of gunpowder residue. However, to completely eliminate fire related casualties, it is necessary to use a PUF wall cladding material with low flame spread rates together with an effective gunpowder cleaning system.</P>
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He Hucheng,Liu Botao,Wang Qin,Tan Fuchen,Gui Haoya,Zhang Chenyang 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6
Induction motor (IM) is widely used in numerous industrial applications. However, achieving high-performance control of IM by using conventional control algorithms is diffi cult because of the mathematical model of high-order, strong coupling, and nonlinearity. Although fi nite control set model predictive current control (FCS-MPCC) has attracted considerable attention because of its simple structure, fast dynamic response, and excellent performance, its performance is degraded substantially if a mismatch exists between model parameters and actual machine parameters. To overcome these problems, active disturbance rejection controller based MPCC (ADRC-MPCC) was proposed for improving the dynamic property and robustness of IM in this paper. The model errors on the IM caused by the load torque and parameter changes were observed and compensated using the extended state observer and nonlinear state error feedback. Two outer loops, namely the ADRC speed loop controller and ADRC fl ux loop controller were designed to improve the rejection disturbance performance of IM speed control system. Furthermore, the calculation process of MPCC of the inner loop is also simplifi ed by ADRC-MPCC. The proposed control strategy was compared and verifi ed with PI control and FCS-MPCC by using MATLAB/Simulink. Simulation and experimental results confi rmed the robustness and dynamic performance of the proposed control strategy
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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>
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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.
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Dong Kai,Rong Qianqian,Xiao Ruirui,Gao Yunfei,Wang Fuchen 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.4
Liquefi ed natural gas production plants usually suff er from line blockage, which causes economic, environmental, and safety issues. The blockage, mainly caused by the solidifi cation of heavy hydrocarbons, should be avoided or mitigated by removing the impurities as thoroughly as possible. In this work, we proposed a scheme taking cryogenic liquefi ed propane as absorbent to absorb heavy hydrocarbons in the liquefi ed natural gas production process. This paper fi rst investigated freeze-out profi les of liquefi ed natural gas combined with marginal benzene and toluene by the ThermoFAST simulator, which showed that the precipitated solid tended to form under a low temperature, which posed challenges in purifi cation. Subsequently, the feasibility of using liquefi ed propane as an absorbent to remove benzene and toluene was studied using Aspen Plus. A cryogenic absorption and regeneration process for liquefi ed natural gas purifi cation was proposed, and factors infl uencing the performance were investigated. The results showed that the hydrocarbon impurities are removed more thoroughly at a high fl owrate of the recycled absorbent stream. The absorption process exhibited an apparent cooling eff ect mainly caused by the vaporization of liquefi ed propane to the gas phase, and the higher operation temperature impedes the vaporization process. For a better purifi cation eff ect, the system should be operated under a lower pressure or with a higher recycled absorption solution fl owrate. Based on the design simulation results, utilizing liquefi ed propane as an absorbent to remove heavy hydrocarbons is novel and promising for LNG purifi cation.
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