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2단 선회류 유동층 연소로내에서 Paper Sludge 의 소각
이규현,이기호,이제근,전해수 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.4
2단 선회류 유동층 연소로에서 수분함량이 높은 paper sludge의 소각을 위한 기초자료를 얻기 위해 유동화 공기속도, 연료주입량, 층온도 및 양론공기 비를 변화시키면서 소각실험을 행하였다. 밀도가 낮은 paper sludge의 유동층 연소에 있어 층매질과 paper sludge간의 밀도차로 인한 분급현상에 의해 유동층내의 온도분포는 균일하지 않았다. 또한 연소가스중에 함유되어 하단 유동층으로부터 유출되어 상단 freeboard에 유입된 미세입자중 일부는 선회류 효과에 의해 가스흐름으로부터 분리되어 상단 유동층내에서 재연소가 일어나고, 연소로 밖으로 유출되는 입자들도 선회류 흐름을 따라 움직이기 때문에 로내 체류시간이 길어져 연소효율은 단단 유동층 연소로에 비해 증가하였다. Incineration experiments are carried out to obtain the fundamental data for application of a two-stage swirl-flows fluidized bed combustor to the incineration of paper sludge wastes with high moisture content. Experimental parameters are identified as the fluidizing air velocity, fuel feed rate, bed temperature and stoichiometric air ratio. Experimental results show that temperature distribution within the fluidized bed is not uniform due to the segregation by density difference between bed materials and paper sludge. A part of unburnt fines entrained from the lower bed are separated from the gas stream due to the swirling effect in the upper stage freeboard of the combustor, and eventually settled down on the upper bed and burnt by secondary air. Further, the non-separated remainder has a long residence time as it moves along the swirling flow. Therefore, the combustion efficiency of paper sludge in the two-stage swirl-flow fluidized bed combustor is enhanced compared with that in the single-stage fluidized bed combustor under the same operating conditions.
適時生産 관리시스템에 관한 연구 - 철근공사를 중심으로 -
이규현,최인성 한국건축시공학회 2005 한국건축시공학회지 Vol.5 No.4
This study aims at establishing JIT production management system to enable manage the resources input into from procurement through construction based on correct identification of the process, an analysis on the amount of input materials and information sharing.This study has focused on the process control and working process of rebar work in domestic apartment house construction where the overall scope of process from the planning phase to the construction phase has been analyzed in this study. Also construction phase was selected for the application of a sample case. A basic model for JIT production was generated with these processes. Furthermore A questionnaire and the on-site survey with process, checklist and control data were prepared and performed for the application of JIT production management model into rebar work. The governing scopes of JIT production management system include process management, material management, yard loading and moving management and inventory control, and the operation of each control item