• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.11 no.2
• /
• pp.590-596
• /
• 2010

Through this study, we have attempted the thermodynamic analysis on the dimethyl ether (DME) separation process, which can be used for diesel alternative fuel, additive to LPG and natural gas. And we also have completed the simulation of DME separation process using PRO/II with PROVISION. As an appropriate thermodynamic models, we selected NRTL liquid activity coefficient model to describe the non-ideality between methanol and water. To estimate the vapor phase non-idealities, we have chosen the Peng-Robinson equation of state model. And we also use the Henry's law option to predict the solubilities of non-condensible gases like CO, $CO_2$, $H_2$, $CH_2$ and $N_2$ in methanol solvent. Case study showed that optimal solvent to feed molar ratio was 3.40

• Journal of Bio-Environment Control
• /
• v.28 no.4
• /
• pp.293-301
• /
• 2019

The experiment was conducted to determine the performance of DME combustion gas when used as a fuel for DME burner for raising temperature and $CO_2$ concentration in greenhouse and also to examine its effects on chlorophyll content, and fresh and dry weight of lettuce and Chinese cabbage. DME-1 and DME-2 treatments consisted of average DME flow quantity in duct were $17.4m^3min^{-1}$ and $10.2m^3min^{-1}$ respectively to greenhouse-1 and greenhouse-2 and no DME gas was supplied to greenhouse-3 which was left as control (DME-3). DME supply times were $0.5hr\;day^{-1}$, $1hr\;day^{-1}$, $1:30hrs\;day^{-1}$ and $2hrs\;day^{-1}$ on week 1, 2, 3, and 4 respectively. Chlorophyll content and fresh and dry weight of lettuce and Chinese cabbage were measured for each treatment and analyzed through analysis of variance with a significance level of P<0.05. The result of the study showed that $CO_2$ concentration increased up to 265% and 174% and the level of temperature elevated $4.8^{\circ}C$ and $3.1^{\circ}C$ in greenhouse-1 and 2, respectively as compared to greenhouse-3 due to application of DME combustion gas. Although, the same crop management practices were provided in greenhouse-1, 2 and 3 at a same rate, the highest change (p<0.05) of chlorophyll content, fresh weight and dry weight were found from the DME-1 treatment, followed by DME-2. As a result, DME combustion gas that raised the level of temperature and $CO_2$ concentration in the greenhouse-1 and greenhouse-2, might have an effect on growth of lettuce and Chinese cabbage. At end of experiment, the highest fresh and dry weight of lettuce and Chinese cabbage were measured in greenhouse-1 and followed by greenhouse-2. Similarly chlorophyll content of greenhouse-1 and greenhouse-2 were more compared to greenhouse-3. In general, DME was not producing any harmful gas during its combustion period, therefore it can be used as an alternative to conventional fuel such as diesel and liquefied petroleum gas (LPG) for both heating and $CO_2$ supply in winter season. Moreover, endorsed quantify of DME combustion gas for a specified crop can be applied to greenhouse to improve the plant growth and enhance yield.

• LP가스
• /
• s.105
• /
• pp.4-5
• /
• 2006

우리는 현재 프로판산업의 경쟁력강화를 위해 배송센터 시범사업을 시행중에 있고, 소형저장탱크 보급 활성화, LPG+DME혼합연료 보급을 위한 연구, 자동차사의 LPG신차출시, 경승용차의 LPG화, 저공해LPLi차 기술개발 등 현안과제가 산적해 있습니다. 모든 과제들이 최선의 방향에서 원활히 해결될 수 있도록 지혜를 모아야 하겠습니다.

• Transactions of the Korean hydrogen and new energy society
• /
• v.27 no.4
• /
• pp.431-440
• /
• 2016

Electric or hydrogen energy source is expected to solve a various issues including energy security and exhaust pollution. However, it is required a lot of time and a variety of development to apply for commercialization. Therefore, it is needed to translation fuels between the future and the present. DME (Dimethyl Ether) can play a reduce exhaust emission from medium- to heavy-duty engines that are mostly used in commercial sector. It have applied to the DME fuel as a various alternative fuel including power generation in many countries. Especially, it is necessary to secure the energy of energy-poor areas that are widely distributed around the world. And Korea also has the energy-poor areas due to geographical characteristics. These areas has been covered by their own energy through some small diesel generators, diesel boiler etc. If DME fuels are supplied in new demand such as rural sector with energy poor area, DME fuel will be available in the wider sector. In this study, it investigated performance and emission characteristics of agricultural generator and air heater using DME fuel. So the existing equipment of generator and air heater was modified to apply DME fuel. And combustion characteristics and properties of exhaust gas according to the contents of the DME fuel were evaluated. DME fuel showed a potential application in agricultural generator and air heater.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.15 no.3
• /
• pp.54-62
• /
• 2007

The knock characteristics in an engine were investigated under homogeneous charge compression ignition (HCCI) operation. Liquefied petroleum gas (LPG)and gasoline were used as fuels and injected at the intake port using port fuel injection equipment. Di-methyl ether (DME) was used as an ignition promoter and was injected directly into the cylinder near compression top dead center (TDC). A commercial variable valve timing device was used to control the volumetric efficiency and the amount of internal residual gas. Different intake valve timingsand fuel injection amounts were tested to verify the knock characteristics of the HCCI engine. The ringing intensity (RI) was used to define the intensity of knock according to the operating conditions. The RI of the LPG HCCI engine was lower than that of the gasoline HCCI engine at every experimental condition. The indicated mean effective pressure (IMEP) dropped when the RI was over 0.5 MW/m2and the maximum combustion pressure was over 6.5MPa. There was no significant relationship between RI and fuel type. The RI can be predicted by the crank angle degree (CAD) at 50 CA. Carbon monoxide (CO) and hydrocarbon (HC) emissions were minimized at high RI conditions. The shortest burn duration under low RI was effective in achieving low HC and CO emissions.

• Korean Chemical Engineering Research
• /
• v.50 no.2
• /
• pp.328-333
• /
• 2012

In this study, CFD simulation was performed with commercial CFD code FLUENT for the 3D mixing tank model (1 m in a diameter and 2.5 m in a height) of DME-Propane liquified fuels. Initial condition set-up with existence of DME 146 l at the upper side of mixing tank and Propane 770 l at the lower side of mixing tank. Characteristics of mixture and fluid flow were observed for 34 hours simulation. Two liquid fuel were uniformly mixed within range of 3 mol% after 24 hours, and range of 1 mol% after 34 hours. The simulation result following 4 hours was verified with KOGAS experimental data.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
• /
• 2010.04a
• /
• pp.178-186
• /
• 2010

• Transactions of the Korean hydrogen and new energy society
• /
• v.34 no.1
• /
• pp.59-68
• /
• 2023

In this study, the performance of high-pressure fuel pumps was compared to find a high-pressure pump suitable for dimethyl ether (DME) fuel, and to establish a database of basic data on flow rates. The use of DME in compression ignition engines can reduce pollutant emissions. The cetane value of DME is higher than that of diesel fuel. The physical properties of DME are similar to liquefied gasoline gas (LPG), and when pressurized at a pressure of 6 bar or more, it changes from gas to liquid. Two types of high pressure pumps used in this study were independent injection type pump and a wobble plate type pump. Two high-pressure pumps with different injection types were compared. By measuring and comparing the performance changes of the two high-pressure pumps, a pump suitable for DME was selected and performance improvement measures were proposed. The changed experimental conditions to measure the performance change of the high pressure pump were increased in the units of 100 to 1,000 rpm and 100 rpm, and the experiment was performed at common rail pressures 300 and 400 bar. it was confirmed that the DME inside the fuel supply system remained in a liquid state through temperature sensors, pressure sensors, and pressure gauges. As a result of the experiment, it was confirmed that the flow rate discharged from the high-pressure fuel pump increased as the motor rotational speed increased, and the flow rate of the high-pressure fuel pump

• Tunnel and Underground Space
• /
• v.19 no.2
• /
• pp.77-85
• /
• 2009

Flexible and lined segment air-tight tunnelling technology for Compressed Air Energy Storage-Gas Turbine(CAES-G/T) power generation was introduced. The distinguished characteristics of the air-tight tunnel system can be summarized by two facts. One is that the high inner pressure due to compressed air is sustained by surrounding rock mass with allowing sufficient displacement of lining segment. The other is that the air-tightness of storage tunnel was enhanced by adopting a specially designed rubber sheet. The flexible lined air-tight underground tunnel can be constructed at a comparatively shallow depth and near urban area so that the locally distributed CAES-G/T power generation can be accomplished. In addition, this air-tight tunnelling technology can be applied to a variety of energy underground storage tunnels such as Compressed Natural Gas(CNG), Liquifed Petroleum Gas(LPG), DeMethyl Ether(DME) etc.

• 한국신재생에너지학회:학술대회논문집
• /
• 2005.06a
• /
• pp.303-305
• /
• 2005

현재 인류가 직면하고 있는 에너지 및 환경 문제를 해결할 수 있는 최선의 대안으로서 수소 에너지 및 연료전지 기술에 대한 연구가 활발히 진행 중이다. 본 연구에서는 디메틸 에테르를 이용한 수소 생산 기술에 대한 연구를 수행하였다 디메틸 에테르(BATE)는 안정한 화합물로서 비 활성적이고 부식성이 없으며 발암성 및 마취성이 얼어 인체에 무해한 청청 연료로서 각광을 받고 있으며 특히 기존의 LPG 인프라를 그대로 사용할 수 있는 장점 등으로 수소 스테이션 및 소형 연료전지용 수소 발생기 등에의 적용을 위한 연구가 활발히 진행 중이다. 본 연구에서는 이러한 응용을 위한 수소 발생기용 DME 개질 반응기의 개발을 위하여 본 반응에 대한 촉매 종류의 영향, 공간속도의 최적화, 반응 메카니즘에 따른 촉매 선정, 반응온도 등의 다양한 반웅 조건에 대한 영향을 확인하고 실제 소형 연료전지를 위한 수소공급 장치로서 적용코자 마이크로채널 반응기에 적용하여 마이크로채널 DME 개질반응기의 컴팩트한 수소공급 장치로서의 적용 가능성을 평가하였다.