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30 ㎏/hr 급 열분해 용융 소각로에서의 폐기물 열분해/연소/용융 특성 연구
류태우(Taeu Yu),김봉근,양원(Won Yang),전금하(Keum Ha Jeon),신동훈(Donghoon Shin),박상욱,임성진,김대성,이진호,황정호(Jeong Ho Hwang) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
A novel pyrolysis-melting incineration system of reduced scale (30 ㎏/hr) is designed and constructed in Korea Institute of Industrial Technology. The incineration process is composed of three parts: pyrolysis, gas combustion and ash melting processes. For each unit process, experimental and numerical approaches including reduced-scale cold/hot flow tests have been conducted to find optimal design and operating conditions. This paper presents major results of these approaches with brief descriptions on the pilot-scale incinerator (200 ㎏/hr) under construction and future research works.
Pilot 규모의 열분해 용융 소각 시스템에서의 열분해 및 연소 특성 연구
류태우(TaeU Yu),양원(Won Yang),박주원(JuWon Park),김봉근(BongKeun Kim),이기방(GiBang Lee),김희열(HiYeol Kim),박상신(SangShin Park),전금하(Keum Ha Jeon) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
A pilot scale (200㎏/hr) pyrolysis melting incineration system is designed and constructed in Korea Institute of Industrial Technology. The incineration process is composed of pyrolysis, gas combustion, ash melting, gas stabilization, waste heating boiler, and bag filter. For each unit process, experimental approaches have been conducted to find optimal design and operating conditions. Especially, a pyrolysis is very important process in that it is a way of energy recirculation and minimizing the waste products. This paper presents major results of the most efficient operating conditions in a pilot scale pyrolysis melting incinerator.
125 ㎿<SUB>th</SUB> Oxy-PC Corner Firing Boiler 수치해석 연구
채태영(Taeyoung Chae),류태우(TaeU Yu),방병열(Byung Reol Bang),양원(Won Yang) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.38
Characteristics of oxy-PC(Pulverized coal) combustion are one of the key parameters for design of a PC boiler. In this study, a conventional corner-firing boiler for a 125 ㎿th PC power plant was numerically simulated under the conditions of air-PC and oxy-PC combustion, using FLUENT 6.3. We used discrete phase model for simulating behavior of coal particles, and drying, pyrolysis, char combustion, char gasification and volatile performed for various design conditions of an oxy-PC corner-firing burner such as flue gas recirculation ratio, velocities, temperatures and oxygen concentrations of the primary/secondary oxidizer. Simulation results of oxy-PC combustion were also compared with convectional air-PC conditions, and optimum operation conditions under the view of combustion, NOX emission and radiative heat transfer were discussed.
열분해 용융소각로 내 용융로에서의 온도변화에 대한 과정론적 모델링
김봉근(Bong-Keun Kim),양원(Won Yang),류태우(TaeU Yu) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
The previous models for thermal behavior in the melting furnace were deterministic, composed of such a form that if the initial input conditions are determined, the results would have been come out by using the basic heat equilibrium equations. But making the experiment by trusting the analysis results, the melted slag is fortuitously set often, because temperature variation of the melted slag in the reaction process is not point function but path function. So in this study, a transient model was developed and verified by comparing with the experimental results.
폐기물 열분해/용융 소각 시스템의 용융로 Scale-up 연구
양원(Won Yang),김봉근(BongKeun Kim),류태우(TaeU Yu),전금하(KeumHa Jeun) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 Vol.- No.-
Ash melting chamber is one of the key facility of the pyrolysis-melting incineration system, and it should be designed and operated very carefully for avoiding solidification of slag. In this study, an example of numerical and experimental scale-up process of the melting chamber, in which high speed air is injected to the molten slag and generates bubbles, which enhances agitation of the slag and char combustion, is presented. Cold flow test, combustion and melting test in a lab-scale (30 ㎏/hr) chamber and a pilot scale (200 ㎏/hr) chamber. Minimum energy for maintaining molten slag is derived, and it was found that the molten slag can be maintained efficiently by concentrating heat into the bubbling slag.
루프 히트 파이프의 작동유체 선정을 위한 성능계수 도출
정욱철(Wukchul Joung),이진호(Jinho Lee),류태우(Taeu Yu) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Despite outstanding performance of loop heat pipes (LHPs) over other two-phase heat transfer devices, widespread applications of these devices are limited due to ambiguities on their operation. Among these, of particular interest is a figure of merit for working fluid selection. As for the selection of working fluids of LHPs, the figure of merit for heat pipes has usually been used, and qualitative approaches, such as choosing a working fluid of steep saturation curve slope, etc, has additionally been employed. However, as the figure of merit for heat pipes only concerns a maximum heat transfer capacity, it is not appropriate for assessing thermal performance of a working fluid with respect to steady state thermal performance of the LHPs. In this work, a figure of merit for LHPs, which quantitatively evaluates thermal performance of a working fluid regarding the steady state operation of the LHPs, is theoretically derived and experimentally verified.
폐기물 열분해 용융소각로의 용탕 유지를 위한 실험적 연구
김봉근(BongKeun Kim),박주원(JuWon Park),류태우(TaeU Yu),양원(Won Yang),전금하(KeumHa Jeun) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
The large amount of energy is consumed in a process for keeping the high temperature melting pool. For this reason, in addition to the wastes input to keep the high temperature melting pool, it is necessary for an auxiliary fuel and LOx to throw into the melting pool. So in this study, using a new melting furnace system, the experiments to keep the melting pool with minimal energy without throwing an auxiliary fuel and LOx was carried out. Also it is hoped that the results of the experiment will be available to analyze keeping a melting pool and behavior in a melting furnace.
박주원(JuWon Park),박상신(SangShin Park),양원(Won Yang),류태우(TaeU Yu) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 Vol.- No.-
This study was conducted to find out the chlorine removal characteristics of waste plastic mixture by pyrolysis process with thermogravimetric analysis(TGA) and a lab-scale pyrolyzer. The material used as plastic wastes were PE (Poly-ethylene), PP (Poly-prophylene), and PVC (Poly Vinyl Chloride). Experimental procedure were composed of three steps ; 1st step: TGA of PVC, PP and PE, 2nd step: chlorine removal rate of PVC in a lab-scale pyrolyzer, 3rd step: chlorine removal rate of PVC-PE and PVC-PP mixture in a pyrolyzer. Through the results of TGA, we can estimate the basic pyrolysis characteristics of each plastic, and then we can also derive the design parameters and operating conditions of the lab-scale pyrolyzer. The results can be used as primary data for designing a system to produce RPF (Refuse Plastic Fuel), a waste incinerator and a pyrolysis/gasification process.
Metallurgical refining study for production of solar grade (SoG) silicon by synthetic slag
김대석(Kim, Daesuk),이상욱(Lee, Sangwook),박동호(Park, Dongho),류태우(Yu, TaeU),문병문(Moon, ByungMoon),민동준(Min, DongJoon) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
In this study, metallurgical grade (MG) silicon with 99% purity produced by arc furnace process was systematically investigated for slag refining. The most problematic impurities to remove from MG silicon are boron (B) and phosphorus (P). To remove B and P from MG-silicon, we used synthetic slag in the molten state. MG-silicon with synthetic slag of CaO, SiO₂, and CaF₂ was melted using by high-frequency induction furnace with electrical output of 50kW. Specimens prepared by various refining process conditions(holding time, mixture ratio) were inspected by combined analysis of ICP-MS and XRF. With this approach, B has been reduced to <5ppm, P to <1ppm and other impurities to 0.1~0.2% except for Calcium. Calcium has been increased from 17ppm to 1500ppm. Problem of calcium contamination will be resolved by additional refining processes.
UMG-Si 내 Boron 제거를 위한 스팀플라즈마와 전자기연속주조정련법의 활용
문병문(Moon, Byungmoon),김병권(Kim, Byungkwon),이호문(Lee, Homoon),박동호(Park, Dongho),류태우(Yu, Taeu) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
최근 친환경적이고 저투자비용의 빠른 생산성을 가진 야금화학적인 방법으로의 태양전지급 실리콘 생산공정이 빠르게 성장하고 있다. 이로 인해 금속급 실리콘(MG-Si)에서부터 태양전지급 실리콘(SoG-Si)으로의 정련공정 또한 많은 연구가 진행되고 있다. 본 연구에서는 UMG-Si 내 주요 불순물인 Boron함량을 SoG-Si 순도로 정련하는 것을 목표로 기존의 방법과 달리 전자기연속주조정련법을 사용하여 도가니 비접촉식 용융 후 스팀플라즈마토치를 통해 Boron을 제거하고자 하였다. 실험에 사용한 가스 유량은 H₂O 0.3~1.0ml/min, H₂ 20~40ml/min 이며 실험 후 ICP-MASS 분석 결과 초기 Boron 함량 2.9ppm으로부터 0.17ppm으로 줄었음을 확인하였다.