• Clean Technology
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• v.20 no.1
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• pp.80-87
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• 2014

Numerical study was investigated to obtain the database for developing a fast pyrolysis power boiler by waste fuel. The studies with various conditions were performed using ANSYS FLUENT. Also, the fuel properties was experimentally analyzed to utilize the input parameters for numerical analysis, that were proximate and ultimate analysis, reaction kinetics included pyrolysis and combustion. The results showed that temperature, combustion and exhausted gases was changed with heating value of fuel and feeding rate. Finally, the stable operating condition by analyzing results was proposed.

• Journal of Energy Engineering
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• v.2 no.2
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• pp.208-214
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• 1993

Pyrolysis of bituminous coal has been carried out in a two-stage fixed bed reactor to produce high heating value gas(7000 kcal/N㎥) for industrial or town gas usage. The effects of coke catalyst, pyrolysis temperature (468∼565$^{\circ}C$), and catalytic cracking temperature (700∼850$^{\circ}C$) on the product gas properties from pyrolysis of bituminous coal have been determined. From pyrolysis of Dong Jin coal with coke, the carbon deposition on catalyst is found to be less than 5% of product tar and approximately 15% of total energy iii the parent coal can be recovered as high heating value gas. Oil composition in the product tar from the two-stage pyrolysis is higher than that from low-temperature pyrolysis. The tar produced from pyrolysis below 516$^{\circ}C$ can be easily catalytically cracked but, the tar produced above 565$^{\circ}C$ cannot be cracked easily with catalyst. From the product gas analysis, the catalytic cracking temperature should be maintained below 800$^{\circ}C$ since cracking speed of ethylene increases remarkably with the cracking temperature above 800$^{\circ}C$.

• JOURNAL OF ELECTRICAL WORLD
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• s.356
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• pp.41-47
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• 2006

역자 주: 요즈음 우리는 수소경제라는 단어를 자주 듣는다. 수소경제란 수소가 석탄이나 석유와 같은 화석연료를 대체하여 우리생활의 주 에너지원 역할을 하는 시대를 말한다. 이러한 수소경제를 구현하기 위하여는 경제성 있는 수소생산이 뒷받침 되어야 한다. 지금은 물 전기분해나 천연가스로부터 수소를 얻고 있으나 낮은 효율 때문에 경제성이 없다. 한국을 비롯하여 세계 여러나라기 원자로에서 나오는 고열을 이용하여 수소를 생산하는 기술개발에 박차를 가하고 있다. 이와 관련해서 Nuclear Engineering(2005년 7월)에 게재 되었던 내용을 번역하여 소개한다

• 한국연소학회:학술대회논문집
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• 2014.11a
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• pp.263-263
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• 2014

Low temperature pyrolysis of woody biomass has been conducted to produce highcalorie torrefied fuel. In this experiment, to maximize the energy efficiency in heat transfer, flue gas is directly used for heat source in the torrefier. To accomplish the oxygen free environment in the torrefaction reactor, a burner has been developed and it can be runned with fuel rich state. An inner central axis rotating type of reactor was applied in experiment. To use the calorific gases produced from torrefier, another burner is developed to combust them.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.120.1-120.1
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• 2014

고온 plasma는 전자, 이온, 중성입자로 구성된 이온화된 기체로 국소열평형 상태의 구성입자가 수천도에서 수만도에 이르는 큰열용량을 갖는 불꽃형태를 이루고있다. 따라서 고온 plasma는 고온, 고열로 대상물질을 용융 또는 기화시켜 물질의 물리적상태를 변화시키는 열원역활을 하거나, 높은반응성을 갖는 입자들에 의한 화학반응을 촉진하는 반응촉매로 작용하여 고기능성 부품소재, 에너지 환경, 원자력, 항공우주,유가금속 재활용등의 분야에서 핵심적인 역활을 하고 있슴니다. 본 발표에서는 연구소에서 지금까지 국책과제로 수행되었던 고온 plasma을 유해폐기물(병원, 유독 액상폐기물, 군화공폐기물, 중금속 함유 폐기물, 폐 plastic 가스화 등)처리에 관한 전반적인기술을 소개하고져함.

• Transactions of the KSME C: Technology and Education
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• v.3 no.4
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• pp.299-305
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• 2015

Nuclear hydrogen production technology is being developed for the future energy supply system. The sulfur-iodine thermo-chemical hydrogen production process directly splits water by using of the heat generated from very high temperature gas-cooled reactor, a typical Generation IV nuclear system. Nuclear hydrogen key technologies are composed of VHTR simulation technology at elevated temperature, computational tools, TRISO fuel, and sulfur iodine hydrogen production technology. Key technology for nuclear hydrogen production system were developed and demonstrated in a laboratory scale test facility. Technical challenges for the commercial hydrogen production system were discussed.

• Journal of the Korea Organic Resources Recycling Association
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• v.13 no.4
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• pp.79-88
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• 2005

The wastes generated in farming or fishing villages are mostly those of high moisture content or those once used for farming or fishing work, which require a complex process even for disposing of them alone, and moreover they have been recognized to cause a secondary side effects. The study thus is intended to conduct the basic character analysis and incineration test so as to develop the thermal decomposition furnace which will be optimal in disposing of the wastes generated from urban area that mostly have a high thermal energy or require a complex treatment process. And the subject included in the study, in addition, is to design and develop the furnace aimed at reducing the harmful ingredient as well as recycling the heat generated in the course of incineration.

• Journal of the Korea institute for structural maintenance and inspection
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• v.17 no.2
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• pp.94-100
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• 2013

In this paper, Machinery analysis was conducted, in order to predict highest exposure temperatures and the analyze fire damage in the case of fire on reinforced concrete structure. After analyzing differential thermal of reference materials in accordance with temperature of concrete reference core specimen, it turned out that powerful endothermic peak came resulting from evaporation of capillary water and get water untill $200^{\circ}C$, another endothermic peak came resulting from decomposition of calcium hydroxide at $520^{\circ}C$, and then mass of reference materials remarkably decreased due to endothermic reaction. Another powerful endothermic reaction came after decomposition of calcite at $720^{\circ}C$. After analyzing X-ray diffraction of reference materials in accordance with temperature of concrete reference core specimen, it turned out that calcium hydroxide existed until the temperature of $400^{\circ}C$, but CH almost disappeared and CaO appeared from $600^{\circ}C$. The production increased in proportion to the temperature. This is because that calcium hydroxide and calcite are decomposed and CaO is produced when the temperature of concrete increases with fire. It is estimated that calcium hydroxide and calcite are utterly decomposed and peak disappears, and peak of CaO is remarkably formed instead, at the temperature of $700-800^{\circ}C$.

• Journal of the Korea Concrete Institute
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• v.16 no.5 s.83
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• pp.597-604
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• 2004

This work involves quantitatively investigating the correlation between reductions in strength and variations in pore structure under high temperature that can be utilized as estimation for predicting the inner temperature of member damaged by fire. The experimental results were remarkedly affected by micro-filling effect of silica fume and the different water-binder ratios. The increase of the exposure temperature caused the increase of porosity, which resulted from the reason that evaporable water in gel pore or capillary pores as well as chemically bound water was eliminated from hardened cement paste due to the dehydration of C-S-H and $Ca(OH)_2$. Thermal shrinkage of hardened cement paste gives rise to micro-crack, which cause the increase of porosity. Based on the experimental result that the increase of porosity is in charge of exposure temperature, how porosity is distributed can predict temperature-time history and assess the performance of concrete damaged by fire.

• Journal of the Korean Institute of Gas
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• v.15 no.2
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• pp.82-87
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• 2011

Heat transfer oils are used in applications such as heating systems of chemical plant, refinery heat exchange systems, gas plant process, injection molding systems, and pulp and paper processing. These oils are extremely stable and resistance to thermal and oxidative degradation. In the event of a spill or accidental release of heat transfer oils, it can be ignite easily when there is an ignition source. This paper discusses the flammability and thermal stabilities of new and used oils. The flammability of the oils are assessed by measuring changes in flash point and auto ignition temperature. The thermal stability of oils are evaluated by the thermal screening unit ($TS^u$) and the differential scanning calorimeter (DSC). From the experimental results, it is suggested to give fire hazard characteristics to safe precautions for the proper use and treatment of heat transfer oils.