• 한국신재생에너지학회:학술대회논문집
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• 2008.05a
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• pp.483-486
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• 2008

본 연구에서는 디스크 이동식 열분해 실증 설비를 이용하여 폐타이어 열분해 반응을 수행하였고, 생성된 열분해 생성물들의 특성을 분석하였다. 폐타이어 열분해 반응은 약 $550^{\circ}C$에서 90분간 진행되었고, 반응 결과 Recovered Oil, Carbon Black, Non Condensing Gas(NC Gas)가 생성되었다. 폐타이어 열분해 생성물의 수율은 Recovered Oil $40{\sim}50%$, Carbon Black 30$\sim$35%, NC Gas 10$\sim$15%, Steel 10$\sim$15%로 나타났다. 폐타이어 열분해 반응 후 생성된 Recovered Oil은 비점 및 특성 분석 결과 상업용 중유와 비슷한 성질을 나타냈고, 폐타이어 열분해 반응의 또 다른 생성물인 Carbon Black은 특성 분석 결과 고정 탄소 비율이 낮은 반면 회분과 휘발분의 비율이 높아 상업용으로 사용하기 위해서는 적절한 정제 과정이 필요함을 알 수 있었다.열분해 과정 중에 생성된NC Gas는 GC/MS를 이용하여 성분 분석을 수행한 결과, $CO_2$, $CH_4$를 비롯하여 주로 탄화수소류로 이루어졌으며, 대부분이 연료 가스로 구성되어 있어 열분해 반응의 열원으로서 사용이 가능하였다.

• Resources Recycling
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• v.22 no.2
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• pp.11-17
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• 2013

The recycling technology of carbon residue produced from the process of oil recovery in waste tire pyrolysis is significant in environmental and economical aspects. This study was done to figure out the recycling possibility of carbon residue to activated carbon. For this, the characteristics of the carbon residue obtained from the commercial pyrolysis process of waste tire were studied. Also, the variation of pore structure of carbon residue was studied after 1 hour of carbonization at $600^{\circ}C$ and $800^{\circ}C$ and 3 hours of activation at $950^{\circ}C$. The specific surface area of the carbon residue was $8.0m^2/g$ and it increased to $548.3m^2/g$ after carbonization and activation.

• Resources Recycling
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• v.27 no.2
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• pp.24-31
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• 2018

In this study, waste ITO target is dissolved into hydrochloric acid to generate a complex indium-tin chloride solution. Nano sized ITO powder with an average particle size below 30 nm are generated from these raw material solutions by spray pyrolysis process. Also, in this study, thermodynamic equations for the formation of indium-tin oxide (ITO) are established. As the reaction temperature increased from $800^{\circ}C$ to $900^{\circ}C$, the proportion and size of the spherical droplet shape in which nano sized particles aggregated gradually decreased, and the surface structure gradually became densified. When the reaction temperature was $800^{\circ}C$, the average particle size of the generated powder was about 20 nm, and no significant sintering was observed. At a reaction temperature of $900^{\circ}C$, the split of the droplet was more severe than at $800^{\circ}C$, and the rate of maintenance of the initial atomized droplet shape decreased sharply. The average particle size of the powder formed was about 25 nm. The ITO particles were composed of single solid crystals, regardless of reaction temperature. XRD analysis showed that only the ITO phase was formed. Remarkably, the specific surface area decreased by about 30% as the reaction temperature increased from $800^{\circ}C$ to $900^{\circ}C$.

• Advances in nano research
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• v.16 no.1
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• pp.53-69
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• 2024

Advancements in the technology of building materials has led to diverse applications of nanomaterials with the aim to monitor concrete structures. While there are myriad instances of the use of nanoparticles in building materials, the production of smart nano cement-composites is often expensive. Thereupon, this research aims to discover a sustainable nanomaterial from tyre waste using the pyrolysis process as part of the green manufacturing circle. Here, Nano Structure Tyre-Char (NSTC) is introduced as a zero-dimension carbon-based nanoparticle. The NSTC particles were characterized using various standard characterization techniques. Several salient results for the NSTC particles were obtained using microscopic and spectroscopic techniques. The size of the particles as well as that of the agglomerates were reduced significantly using the milling process and the results were validated through a scanning electron microscope. The crystallite size and crystallinity were found to be ~35nm and 10.42%, respectively. The direct bandgap value of 5.93eV and good optical conductivity at 786 nm were obtained from the ultra violet visible spectroscopy measurements. The thermal analysis reveals the presence of a substantial amount of carbon, the rate of maximum weight loss, and the two stages of phase transformation. The FT-Raman confirms the presence of carboxyl groups and a ID/IG ratio of 0.83. Water contact angle around 140° on the surface implies the highly hydrophobic nature of the material and its low surface energy. This characteristic process assists to obtain a sustainable nanomaterial from waste tyres, contributing to the development of a smart building material.

• Journal of the Korean Society of Combustion
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• v.16 no.4
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• pp.8-15
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• 2011

The present study investigates the combustion phenomena in a sludge incinerator using experimental and numerical method. The temperature and gas concentration were measured at 33 points during operation of the incinerator in order to assess the mixing and combustion characteristics. Numerical simulation was also carried out using a commercial CFD code. Simplified inlet conditions were introduced in oder to predict the bulk solid combustion and the diffusion of the volatile matter released by pyrolysis of sludge. The experimental results showed that the combustion process is extremely inhomogeneous. Large variations were observed in the temperature and gas concentrations in the freeboard of the incinerator due to poor mixing performance between the air and the combustibles, which is caused by massive and bulk generation of volatile matter by fast pyrolysis of sludge particles. The boundary condition of the CFD simulation was found effective in predicting the poor mixing and combustion performance of the reactor.

• Proceedings of the KAIS Fall Conference
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• 2001.05a
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• pp.47-48
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• 2001

본 연구의 목적은 폐 구리염화물 용액을 원료로 사용하여 분무열분해 공정에 의해 평균입도가 1㎛이하이며 입도분포가 균일하고 치밀한 조직을 나타내는 미립의 구리산화물 분말을 제조하는데 있다. 또한 본 연구에서는 분무열분해 공정에 의해 생성되는 분말의 특성에 영향을 미치는 반응 온도, 원료용액의 유입속도, 분위기 기체 및 공기의 유입속도, nezzle tip 크기 및 원료용액의 농도 등의 반응인자들의 영향을 검토하였다.

• Proceedings of the KAIS Fall Conference
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• 2003.06a
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• pp.95-97
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• 2003

본 연구에서는 새도우마스크 제조공정에서 발생되는 Fe-Ni 계 폐산 용액에 Ni 성분을 용해시킨 복합 산용액을 원료용액으로 사용하여 분무열분해법에 의해 입도분포 및 조성이 균일하며, 입자형태가 구상이면서 평균입도가 100nm 이하인 Ni-ferrite 나노 분말을 제조하며 원료용액의 유입속도, nozzle tip 크기 및 공기압력의 반응조건 변화에 따른 생성분말의 특성 변화를 파악하였다.

• Journal of Korean Society of Environmental Engineers
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• v.29 no.3
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• pp.289-296
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• 2007

Porous media for sewage treatment were developed through a pyrolysis process of food wastes with loess in the study. This work was carried out in two consecutive stages; in the first stage, new porous media were prepared through a high temperature pyrolysis process, and then the resultant media were applied to a simple lab-scale sewage treatment process in the second stage. To determine the optimum operating conditions of pyrolysis and mixing ratio of materials, physical properties such as specific surface area, porosity and compressive strength of final products were analyzed. The removal efficiencies of TOC and COD were measured to evaluate the effectiveness of resultant porous media. As a result of the experiment, we found that the best mixing ratio of food wastes to loess was 1 : 1 at $1,100^{\circ}C$. Average porosity of the developed media was 37.0%, in which pore size ranged from 1 to $20{\mu}m$, showing quite vigorous microbial activation. After immersing the media into a reactor for sewage treatment for eight days, removal efficiencies of TOC and COD were 87.3% and 85.0%, respectively.

• Resources Recycling
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• v.23 no.4
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• pp.3-11
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• 2014

Large scale generation of plastic waste has generated considerable interest it seeking innovative solutions to waste recycling and reuse. Plastic solid waste(PSW) treatment and recycling processes could be allocated to four major categories, re-extrusion(primary), mechanical recycling(secondary), chemical recycling(tertiary) and energy recovery(quaternary). This review considers the various aspects of the PSW recycling such as recycling methods of PSW, special problems about some proposed process, separation techniques, and recycling of mixed PSW.

• Resources Recycling
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• v.12 no.4
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• pp.20-29
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• 2003

In order to efficiently recycle the waste solution resulting from shadow mask processing, nano-sized Ni-ferrite powder was fab-ricated through spray pyrolysis process. The average particle size of the powder was below 100nm. In this study, the effects of the reaction temperature. the concentration of raw material solution and the injection speed of solution on the properties of powder were respectively investigated. As the reaction temperature increased from $800^{\circ}C$ to $1100^{\circ}C$, average particle size of the powder significantly Increased and power structure became more solid, whereat its specific surface area was greatly reduced. Formation rate and crystallization of($NiFe_2$$O_4$) phale increased along with the temperature rise. As the concentrations of iron and nickel components in wastere solution increased, particle size of the powder became larger, particle size distribution became more irregular, and specific surface area was reduced. Formation rate and crystallization of $NiFe_2$$O_4$ phase increased significantly along with the increase of the concentration of solution. As the inlet speed of solution increased, particle size of the powder became larger, particle size distribution became wider, specific surface area was reduced and powder structure became less solid. As the inlet speed of solution decreased, formation rate and crystallization of $NiFe_2$$O_4$ phase significantly increased.