• Journal of the Korean Institute of Gas
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• v.13 no.6
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• pp.39-43
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• 2009

Gasoline engine have proved its utility in light, medium and heavy duty vehicle in every sector of the world community. The concern about long term availability of petroleum and the increasing threat for the environment by the increasing load of vehicular emission, compel the technology to upgrade itself for meeting the challenges. CNG is environmentally clean alternative to the existing SI Engines with out much change in the hardware. Many researchers have found this as a potential substitute to meet the energy requirement. Higher octane number and higher self ignition temperature make it a good gaseous fuel. Although power output is slightly lesser than the gasoline it's thermal efficiency is better than the gasoline for the same SI Engine. Results showed that reduced CO, hydrocarbon emissions is a favorable outcome, with slight increase in NOx emission when compared with gasoline fuel to dual fuel mode in the existing SI Engines.

• Clean Technology
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• v.15 no.1
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• pp.1-8
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• 2009

The adoption of compressed natural gas (CNG) as a vehicle fuel is a common phenomenon as it is accelerating worldwide. Increasing number of CNG driven vehicles around the world has jumped up from one million in 1996 to five million in 2006. CNG as a vehicle fuel is very popular to the end users because of its clean-burning properties and cost effective solution compared to other alternative fuels like diesel and gasoline. The use of CNG as a fuel reduces vehicular emission that is consisted of carbon monoxide (CO), hydrocarbons (HC), oxides of nitrogen ($NO_x$), carbon dioxide ($CO_2$) etc. This research highlights the characteristics of CNG vehicles, CNG arrangement in the vehicles, CNG fueling procedures and most importantly the environmental and economic factors that are highly considered as cost effective solution for the flexibility of using CNG in the automobiles.

• Clean Technology
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• v.29 no.4
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• pp.288-296
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• 2023

Coal is abundantly available compared to other energy sources and is used as a versatile energy resource worldwide. To address the environmental issues stemming from conventional coal utilization, efforts are underway to develop clean coal utilization technologies, with IGCC technology being a notable example. In IGCC plants, coal is subjected to a CMD process where both drying and pulverization are achieved by supplying hot air. However, if the temperature of the supplied hot air is excessively high, it can lead to devolatilization and spontaneous combustion, thereby compromising the stable operation of the CMD process. This study aimed to measure the devolatilization and spontaneous combustion temperatures of different types of bituminous coal, and to explore their correlations with the characteristics of the coals. Six coal types exhibited devolatilization between 350 and 400 ℃, while three coal types showed devolatilization at temperatures exceeding 400 ℃. Spontaneous combustion ℃curred in one coal type below 100 ℃, six coal types between 100 and 150 ℃, and two coal types above 150 ℃. The measured initiation temperatures were compared with the coal characteristics including the oxygen, moisture, Fe₂O₃, and CaO content, the H/C ratio, and the O/C ratio to establish correlations. Regression analysis was used to calculate the regression coefficients and determination coefficients for each ignition temperature. It was found that 52.44% of the FC/VM data significantly influenced the volatile matter ignition temperature, and 59.10% of the Fe₂O₃ data significantly affected the spontaneous combustionignition temperature.

• Applied Chemistry for Engineering
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• v.20 no.4
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• pp.355-362
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• 2009

Fuels based on petroleum will eventually run out in the near future. DME (Di-methyl Ether) is a clean energy source that can be manufactured from various raw materials such as natural gas, coal as well as biomass. As DME has no carbon-carbon bond in its molecular structure and is an oxygenate fuel, its combustion essentially generates no soot as well as no SOx. Because the physical properties of DME are similar to those of LPG, the LPG distribution infrastructure can be converted to use with DME. DME has such high cetane number of 55~60 that it can be used as a diesel engine fuel. Practical use of DME as a next-generation clean fuel or next-generation chemical feedstock is advancing in the fields of power generation, diesel engines, household use, and fuel cells, among others. The purpose of this paper is review the characteristics, standardization, status of research and development in domestic and foreign countries of DME.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.422-423
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• 1999

최근 저유황 연료유의 공급과 청정연료의 사용 등으로 인해 1차 오염물질은 점차 줄어드는 추세에 있는 반면, 늘어나는 자동차와 급속한 산업화로 산업시설에서 배출되는 질소산화물과 탄화수소류, 휘발성 유기화합물(VOC) 등이 복잡한 광화학 반응을 통해 2차 오염물질을 생성함으로 대기오염의 문제가 심각하다.(중략)

• Clean Technology
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• v.7 no.4
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• pp.243-250
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• 2001

The fuel cell has been continuously studied as environment-compatible alternative energy technology. Lately the basic techniques about stacking and widening are considered to be important for practical use. Although phosphoric acid fuel cell (PAFC) is the most progressed one in the fuel cell technologies, few studies about temperature profile of the stack which can be the basic data for the fuel cell design have been reported yet. In this study, the temperature profile of PAFC stack was simulated. The temperature profiles of stack were obtained at various operating conditions, and when stack is operated the proper position to measure the temperature could be predicted. Also we can propose more effective cooling design. The standard deviation of the temperature profile of the proposed design was is about 50% smaller.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.33 no.10
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• pp.45-49
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• 2004

디젤 차량의 연료인 경유를 대체하기 위하여 개발된 청정 재생 연료로 EU 및 미국 등 선진구에서 보급이 급속하게 이루어지고 있는 바이오디젤의 활용 현황에 대해 소개하고자 한다.

• 보일러설비
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• s.71
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• pp.102-107
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• 1999

최근 선진 각국은 수송기의 연료로 대체에너지의 이용에 대한 관심이 날로 높아가고 있다. 우리나라도 월드컵이 열리는 2002년까지 천연가스(CNG)버스 5,000대를 도입, 서울등 6개 광역시에서 운행키로 했다. 오는 2000년에 발효되는 국제 자동차 배기가스 규제를 앞두고 자동차용 청정 대체연료의 이용 가능성과 문제점에 대하여 알아본다

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1993.05a
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• pp.10-10
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• 1993

기존의 에너지 시스템 하에서 환경 적합성을 재고하는 방향으로 연료전환이 이루어지기 위해서는 천연가스의 역할이 강조된다. 천연가스는 신에너지의 실용화가 요원한 현실에서 과도기를 담당하는 역할을 수행할 연료로 각광을 받고 있다. $CO_2$배출량이 타 화석 연료의 절반 정도에 불과할 뿐 아니라 청정하고 사용이 편리한 특성으로 인해 천연가스에 대한 수요는 급격히 증가하고 있다. 향후 국내 가스사업의 발전방향을 제시하고자 한다. (중략)

• Clean Technology
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• v.23 no.2
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• pp.140-147
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• 2017

In this study, we performed numerical simulation for the catalyst regeneration process of diesel desulfurization reactor. We analyzed the changes in regeneration process according to purge gas flow rate, catalyst permeability, reactor size, and heat loss of reactor. We have found that the regeneration process is very much affected by temperature changes whereas it is hardly affected by catalyst permeability and porosity. We also estimated the regeneration time according to purge gas flow rate and initial temperatures and have found that increasing purge gas temperature is more effect for fast regeneration. The present results can be utilized to design a regeneration process of diesel desulfurization reactor for a fuel cell used in ships. Furthermore, the present work also can be used to design low sulfur diesel supply in oil refineries and therefore contribute to the development of clean petrochemical technology.