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순환유동층 적용을 위한 국내 폐플라스틱 고형연료의 등온 열분해 분석
박경일 ( Kyoung Il Park ),김동원 ( Dong Won Kim ),이태희 ( Tae Hee Lee ),이종민 ( Jong Min Lee ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.6
본 연구에서는 국내 상용 순환유동층 보일러에서 아역청탄과 혼소용 연료로 사용예정인 폐플라스틱 고형연료(RPF)의 열분해 반응특성을 규명하기 위해 열천칭 반응기를 이용하여 등온(350, 375, 400, 425, 450, 500, 850 ℃) 열분해 실험을 수행하였다. 등온 열분해 결과, 반응온도 구간 375~450 ℃에서의 반응모델 변화는 관찰되지 않았으며, 12개 반응모델 중 1차 화학반응(F1)이 가장 적합한 반응모델로 판명되었다. 이때 Arrhenius 식을 사용하여 계산한 활성화에너지는 39.44 kcal/mol이었으며, Iso-conversional 방법을 적용할 경우 활성화에너지 평균값(0.5≤X≤0.9 구간)은 36.96 kcal/mol로 반응모델 결정 여부와 관계없이 유사한 값을 보였다. 한편 순환유동층보일러의 운전온도인 850 oC에서 RPF 입도(d) 변화에 따른 탈휘발 시간은 tdev=10.38d2.88으로 표현할 수 있었으며, 보일러 내부에서 RPF가 균일하게 연소되기 위해서는 연료 입도와 평균 분산 거리(x)가 x≤1.58d1.44의 상관관계를 만족하여야 함을 확인할 수 있었다. In this study, isothermal (350, 375, 400, 425, 450, 500, 850 ℃) experiments were carried out using a custom- made thermobalance to analyze the thermal decomposition properties of refuse plastic fuel (RPF), which is to be used as a cofiring fuel with a sub-bituminous coal at commercial circulating fluidized bed (CFB) boiler in Korea. In isothermal pyrolysis results, no change in the reaction model was observed in the temperature range of 375~450 ℃ and it was revealed that the first order chemical reaction (F1) is the most suitable among 12 reaction models. The activation energy shows similar results irrespective of application of reaction model in that the activation energy was 39.44 kcal/ mol and 36.96 kcal/mol when using Arrhenius equation and iso-conversional method (0.5≤X≤0.9) respectively. Meanwhile, the devolatilization time (tdev) according to particle size (d) of RPF could be expressed as tdev=10.38d2.88 at 850 ℃, operation temperature of CFB and for even distribution and oxidation of RPF in CFB boiler, we found that the relationship of average dispersion distance (x) and particle size was x≤1.58d1.44.
산업연관분석을 이용한 수산업의 경제적 파급효과 추이 분석
박경일 ( Kyoung Il ),박준순 ( Joon Soon Park ),서주남 ( Ju Nam Seo ) 한국수산경영학회 2012 수산경영론집 Vol.43 No.3
Today, the Korean fisheries is undergoing significant hardships, both domestically and internationally. While declining amount of catch, ascending international oil prices and others pose a compelling challenge to the fishing sector, the ever strengthening influence of international institutions related to fisheries and international trade organizations also compel to bring about myriad of changes in the realm of fishery products. Against the backdrop, this study attempted to examine the fisheries catch, aquaculture, service, processing fields in terms of its rippling effect and of how the industry has been changed by analyzing the past and present through an input-output analysis. As for research methods, 168 items of the input-output tables in 2000, 2005, 2009, and 2010 were integrated to form and classify 32 sectors (28 basic sectors+catch, aquaculture, fishery service, processed fishery products) so as to generate production inducement coefficient, sensitivity coefficient, and impact coefficient. The analysis results revealed that: though the linkage effect of fishery industry was not very sizable, the impact coefficient of the processed fishery products was high; the consumption and investment coefficient sector among production inducement coefficient was on an upturn trend; the export coefficient was tended to decline. In the future research, it is necessary to carry out a study based on the integration of detailed classification (404 sector) and a study and analysis of fishery industry by different regions through the inter-regional input-output tables. The fishery industry is one of the crucial industries in Korea. The fishery industry is not only important in its own right but also significant as it exerts influence over other industries. Therefore, it is required that there should be more investment and supports for the development of the fishery industry, and pay efforts to ensure that the investment and development could lead to mutual growth for both the fishery and other various industries.
박소담(Sodam Park),홍종섭(Jongsup Hong),정재용(Jaeyoung Jeong),박경일(Kyoung il Park),박병철(Byeong cheol Park),김동원(Dong won Kim),이규화(Kyu hwa Lee),이은도(Uendo Lee) 한국열환경공학회 2020 한국열환경공학회 학술대회지 Vol.2020 No.춘계
본 연구에서는 연소와 가스화를 위한 복수의 유동층 반응기로 구성된 가압 순산소 연소 기반 복합발전 시스템에 대한 공정해석을 수행하였다. 대상 공정은 가압 순산소 연소로 생성된 고온 연소가스 일부를 가스화제로, 가스화기에서 발생되는 미반응 촤를 연소기 연료로 사용하는 복합공정으로, 두 반응기 사이의 열 및 물질 전달이 매우 중요한 시스템이다. 연소기에서 발생된 배가스 내 고온의 CO₂와 H₂O는 가스화기로 공급되어 각각 Boudouard 반응, 스팀 가스화 반응을 통해 CO와 H₂의 수율에 영향을 준다. 이때 연소 가스는 가스화에 필요한 열원을 공급하는 동시에 가스화제로 이용되므로 가스화기 온도 및 반응물 제어에 큰 영향을 미치며 결과적으로 합성가스의 품질을 좌우한다. 본 연구에서는 상용 공정해석 툴을 활용해 운전인자에 따른 합성가스 생성특성을 파악하고 최적 운전조건 도출을 위한 민감도 분석을 수행하였다. 가스화 운전 제어를 위해 연소가스와 함께 산소를 가스화제로 사용하여 합성가스의 조성 및 발열량을 분석하였으며 연소기로 공급되는 미반응 촤의 순환량에 따른 결과를 분석하여 최적 운전조건을 파악하였다.
신지훈 ( Ji Hoon Shin ),김예라 ( Yea Ra Kim ),국진우 ( Jin Woo Kook ),곽인섭 ( In Seop Kwak ),박경일 ( Kyoung Il Park ),이종민 ( Jong Min Lee ),이시훈 ( See Hoon Lee ) 한국공업화학회 2015 공업화학 Vol.26 No.5
In order to analyze and compare the desulfurization characteristics of five different kinds of domestic limestons, a thermogravimetric analyzer (TGA) was used in this study. Calcium carbonate contents of the domestic limestone varied from 91 to 96 wt%. Experimental temperature and sulfur dioxide concentration of 850 ℃ and 2,750 ppm, respectively were selected to simulate commercial operation conditions. In this study, the calcination and desulfurization reaction of limestones were simultaneously occurred and investigated to simulate in-situ desulfurization reaction in commercial circulating fluidized bed combustors. In addition, desulfurization reactivities of limes having the average particle sizes of 37.5, 90.5, 159, 356 and 750 μm were investigated. Desulfurization reactivities via simultaneous calcination and desulfurization reactions were 5-20% lower than those of using general desulfurization reactions.