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이재장,최재석,노범식,문영배 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.A
Lime is one of the world's most useful chemicals and manufactured in various types of kilns, using various fuels. Quicklimes vary in reactivity with water due to variations in the time and temperature calcining process and type of kiln used. Careful attention and control of time and temperature in the calcining process is necessary to insure a highly reactive lime. Excess time and temperature will cause the lime to be over burned. The highest reactivity of quicklime is obtained by calcination of limestone in the particle size of 0.1cm∼2cm, calcination temperature of 1000℃, calcination time 90min. It was found by the scanning electron microscopes that pores of quick lime is reducted if the soft burned quick lime is heated continually.
이재장,노범식,장경호,정수현 강원대학교 석재복합신소재제품연구센터 1997 석재연 논문집 Vol.2 No.-
본 연구는 여러 가지 용도에 적합한 생석회를 생산하기 위하여 풍촌 석회석을 대상으로 소성시험을 하였다. 시료의 형상은 주로 정방형이나 때로는 구형을 나타내며, 배색 내지 회백색을 띈다. 소성시험에 사용한 시료의 크기는 45∼50㎜ 이며, 소화시험에서는 3.3mm(6mesh) 이하로 분쇄하여 소성하였다. 시료의 광물학적 특성을 보기위하여 편광현미경 관찰, X-ray 분석, 열분석을 하였다. 시료는 거의 순수한 CaCO₃이었으며, 600℃ 부터 열분해가 시작되어 850℃에서 완결되었다. 화학분석 결과 CaO 98.27%인 잠재적 순도를 갖는 생석회를 얻을 수 있음을 알 수 있다. 대략 50 ㎜ 정도의 석회석은 전기로의 온도가 실온에서 1,050℃에 도달하였을 때 99%이상이 소성되었다. 이 때 얻어진 생석회는 거의 순 백색이며 갈라짐이 없었다. 소화시험 결과 ASTM C-110에 의하면 반응성이 우수한 생석회인 것을 알 수 있으며, 1분 이내의 상승온도는 63℃ 이었다. In this study, the calcination characteristics of Pungchon limestone was investigated to produce the optimum quick lime for various uses. The shape of limestone sample was mainly cubic, but sometimes longish. Approximate size range for the calcination tests was from 45 to 50 mm. For the slaking test, it was crushed by cobbing method and screened by 3.3 mm(6 mesh) screen. Mineralogical studies of the sample were carried out to investigate textures, X-ray diffraction analysis and thermal analysis. The result of chemical analysis shows a very high grade limestone with a CaO potential of 98.27%. Approximate 50 mm size's of limestone, about 250 g was calcined more than 99% when the calcination temperature arrived at 1,050 ℃ from room temperature in the electric laboratory furnace. Lumpy lime in nearly white colour with nearly no cracks was observed during calcining test. and during calcination process the limestone places kept their shape. Slaking test(ASTM C-110 ) results indicate a high reactivity product. In slaking, a 63℃ temperature rise was achieved within the first one minutes.
Lee, Sung-Hyun,Park, Junbeom,Kim, Hye-Rim,Lee, Taeseon,Lee, Jaegeun,Im, Yong-O.,Lee, Cheol-Hun,Cho, Hyunjung,Lee, Hyeseon,Jun, Chi-Hyuck,Ahn, Yu-Chan,Lee, In-Beum,Lee, Kun-Hong Elsevier 2016 Carbon Vol.100 No.-
<P>The optimum synthesis conditions for carbon nanotube (CNT) fibers were investigated using the Design of Experiment (DOE) technique. Direct spinning processes are governed by a variety of experimental factors: the methane flow rate, ferrocene flow rate, sulfur flow rate, hydrogen flow rate, water flow rate, and reaction temperature. The process was optimized in two stages that addressed first the Fractional Factorial Design (FFD) and then the Response Surface Methodology (RSM). Results from each experiment were classified according to a 6-step rating system: nothing(1), black gas(2), dust(3), ribbon or film(4), fiber(5), or continuous fiber(6). In the first step, three major factors (methane, sulfur, temperature) were identified as important among the six experimental factors tested using FFD. The effects of the major factors and the interactions were analyzed through the main effect plot and the interaction plot. In the second step, the experimental conditions were optimized using a model equation derived from Box-Behnken design experiments. Finally, the CNT fibers were continuously synthesized under the optimum conditions. The synthesized CNT fibers mainly consisted of single-walled CNTs (SWCNTs) 1.2 -3.8 nm in diameter. The I-G/I-D ratio of the CNT fibers was 48. This work provides a useful methodology for synthesizing the CNT fibers. (C) 2016 Elsevier Ltd. All rights reserved.</P>
ANALYSIS AND OPERATION OF COOLING WATER FLOWS IN A HEAT EXCHANGERS NETWORK
Lee, In Beum,Lee, Hyung Tak,Lee, Bom Sock 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.4
In general, the flow rates of cooling water flowing in a heat exchangers network should be measured for its operational purpose. However, it is difficult to install flow meters on every spot because of the financial and technical reasons. This work presents an explicit algorithm for determining the flow rates of cooling water flowing in the heat exchangers network in the chemical plant. An algorithm is also presented to obtain the desired flow rates of cooling water in each heat exchanger. In order to solve this problem, multivariable optimization techniques will be used to minimize the differences between the desired flow rates and the present cooling water flow rates which flows through the heat exchanger. The commercial computer program GAMS/MINOS which solves the nonlinear optimization problem is used. Numerical examples are presented to illustrate the scope of this work which can be handled with the formulation.