• 한국가스학회지
• /
• 제9권3호
• /
• pp.32-37
• /
• 2005

LP가스나 도시가스시설의 저압 호스 체결에서 견고함과 기밀성을 높이기 위해 호스밴드를 사용한다. 본 연구에서는 호스밴드의 성능 파악과 안전한 체결 거리의 제시를 위하여 호스밴드에 대한 내압강도와 당김력을 측정하였다. 호스밴드의 체결력은 스프링밴드 보다는 귀형밴드에서 높게 나타났으며 최적의 호스밴드 체결거리는 호스접속 끝단부로부터 1${\~}$2 mm일 때에 우수한 것으로 파악되었다.

• 한국가스학회지
• /
• 제12권2호
• /
• pp.12-17
• /
• 2008

강화되는 배출가스 규제에 대응하기 위한 대책으로 LPG 차량에 적용되고 있는 제3세대 LPG 연료공급방식인 LPLi(Liquid Phase LPG Injection)은 LPG 연료를 펌프를 이용해서 고압의 액상연료를 공급하는 것이 가장 핵심적인 기술이다. 그러나 LPG 연료의 경우 저점도, 저비등점의 물리적 특성을 갖는 가스연료로서 기존의 가솔린 또는 디젤용 펌프를 사용할 경우 성능 및 효율이 달라질 수 있다. 본 연구에서는 가솔린 연료 펌프의 임펠라 방식을 응용 변형시켜서 LPG연료용으로 개발된 펌프를 이용하여 다양한 온도와 연료조성 조건에서 초기토출성능 및 효율을 파악하고, 기존 펌프의 단점을 극복할 수 있는 펌프방식의 적용가능성 여부를 판단하고자 한다.

• 한국산학기술학회:학술대회논문집
• /
• 한국산학기술학회 2010년도 춘계학술발표논문집 2부
• /
• pp.949-952
• /
• 2010

The utilization of LPG(Liquefied Petroleum Gas) is increasing as an environmental-friendly fuel in all countries making green growth new paradigm, and use of gas is spread fast as motor fuels to decrease air pollution. Loss of lives by explosion and fire is happening every year as gas use increases, and gas accident in large scale storage property is causing serious problems socially. To minimize this problem, underground containment type storage tank is being presented as an alternative recently. In this study, to minimize explosion occurrence in underground containment type storage tank, the suitable storage tank is designed to consider explosion prevention that makes exposure surface area minimize in confined contents volume and flame to construct storage tank by the most suitable condition in the underground containment room. As a result of the design of storage tank having the most suitable condition by this research, underground containment space was minimized on diameter 3m, length 4.83m in 20 tons storage tank and its safety was improved as exposure surface area in flame decreased by 89.4%, compared with the existent storage tank.

• Industrial Engineering and Management Systems
• /
• 제13권3호
• /
• pp.319-329
• /
• 2014

Supply chain management is a subject that has an increasing importance due to the developments in the global markets and technology. In this paper, a fuzzy multi-objective linear programming model is developed for the supply chain of a company dealing with procurement, storage, filling, and distribution of liquefied petroleum gas (LPG) in Turkey. The model intends to determine the quantities of LPG to be procured, stored, filled to cylinders, and transported between the plants and demand centers for six planning periods. In this model, which aims to minimize both total costs (sum of procurement, storage, filling, and transportation costs) and total transportation distances, demand quantities of the main demand centers and decision maker's aspiration levels about objective functions are fuzzy. After comparing the results obtained from the model with those obtained by using different methods, it is concluded that the proposed method can be applied to real world problems practically and it may be used in this type of problems in order to generate an efficient solution.

• 한국자동차공학회논문집
• /
• 제10권5호
• /
• pp.90-97
• /
• 2002

The interaction between airflow and liquid phase LfG (Liquefied Petroleum Gas) sprays was investigated in a steady flow system embodied in a wind tunnel to simulate the variety of flow inside intake port of LPG engines with liquid injection system. The spray developments in flowing fields with the mean velocities of 5.4, 21.5 and 42.4m/s were identified by spray visualization techniques such as Mie scattering and shadowgraph. The microscopic visualization using a telescopic lens system was performed to investigate the shape and size of liquid droplets in the spray. PDA measurement was used to get 1-dimensional velocity and diameter of liquid droplets. The fast co-flows make the spray field be compact and be lead upward to the injection direction. SMD of the spray was smaller at the fast flowing field. Spray width got bigger and SMD of the spray was smaller with higher injection pressure.

• 한국세라믹학회지
• /
• 제42권11호
• /
• pp.758-762
• /
• 2005

Gas valve for domestic use is used for flow control of LPG (Liquefied Petroleum Gas) or LNG (Liquefied Natural Gas) of which pressure is about $200\;mmH_{2}O(\fallingdotseq0.0196\;[bar])$. Currently, two kinds of valves such as rotary type and button type are widely used in many applications. But, these valves have some problems that they are not controllable and reliable. Piezo actuation combined with modem microelectronics provides a reliable, quiet, low energy, infinitely adjustable gas valve. In this paper, gas valve using piezo actuator which are bimorph and a circle type was studied. Also, Prototype for gas valve was manufactured and characteristics of the prototype gas valve were analyzed.

• 한국가스학회지
• /
• 제4권2호
• /
• pp.46-51
• /
• 2000

연료가스의 사용이 늘어남에 따라 이로 인한 가스사고를 적절하게 관리할 필요성이 증대되고 있다. 최근 4년 동안 발생했던 사고를 체계적으로 분석하여 사고 발생에 영향을 미치는 주된 요인을 찾아내고 이를 사고감소 대책을 제시하는데 활용한다. 해빙기는 연평균 치보다 사고발생비율이 높아 상대적으로 취약한 기간으로 분석되었다. 동 기간동안 LPG(Liquefied petroleum gas) 사고는 연 평균치와 비슷하나 전체적으로 차지하는 비중이 높으며 원인별로는 사용자취급부주의에 의한 사고와 제품불량 혹은 시설미비에 의한 사고가 많아 이에 대한 대책이 시급한 것으로 나타났다. 동 기간동안 도시가스사고는 연 평균치보다 높아 전반적으로 주의 깊게 관리할 필요가 있으며 특히 원인별로 시설미비로 인한 사고 및 타공사로 인한 사고가 비중이 높았다. 비중이 높은 사고나 연 평균치보다 사고비율이 높은 사고에 대해 이를 저감할 수 있는 대책을 제안하였다.

• 한국자동차공학회논문집
• /
• 제22권6호
• /
• pp.96-103
• /
• 2014

Liquefied Petroleum Gas(LPG) has attracted attention as a alternative fuel. The lean-burn LPG direct injection engine is a promising technology because it has an advantage of lower harmful emissions. This study aims to investigate the effect of combustion strategy and excess air ratio on combustion and emission characteristics in lean-burn LPG direct injection engine. Fuel consumption and combustion stability were measured with change of the ignition timing and injection timing at various air/fuel ratio conditions. The lean combustion characteristics were evaluated as a function of the excess air ratio with the single injection and multiple injection strategy. Furthermore, the feasibility of lean operation with stratified mixture was assessed when comparing the combustion and emission characteristics with premixed lean combustion.

• 동력기계공학회지
• /
• 제19권2호
• /
• pp.40-48
• /
• 2015

As advantages of LPG-DI engine, LPG is directly injected into combustion chamber during compression stroke to reduce compression temperature, prevent knock and spontaneous combustion, and adjust engine output using the amount of directly injected fuel, thereby reducing pumping loss caused by throttle valve. Stratified charge can be supplied nearby spark plugs to allow for overall lean combustion, which improves thermal efficiency and can cope with problems regarding emission regulations. In addition, it is characterized by free designing of intake manifold. Despite the fact that LPG-DI has many advantages as described above, there is lack of detailed investigation and study on spray characteristics, combustion flame characteristics, and ignition probability. In this study, a visualization experiment system that consists of visualization combustion chamber, air supply control system, emission control system, LPG fuel supply system, electronic control system and image data acquisition system was designed and manufactured. For supply of stratified charge in the combustion chamber, alignment of injector and spark plugs was made linear.

• 한국정밀공학회지
• /
• 제19권3호
• /
• pp.144-151
• /
• 2002

This work focuses on finding out the noise source and the method of reducing the noise level of LPG(liquefied petroleum gas) fuel injector. The noise of LPG injector in operating condition is due to the impact between valve and valve seat. This study shows that if the revolution of engine is increased, the noise of LPG injector will be more serious but it is not nearly affected by the increment of fuel pressure. The source and transmission paths of noise are identified through the analysis of noise generation mechanism and noise spectrum. The sound absorbing material is tested to verify its efficiency of sound absorption thor the LPG injector. The effect of noise reduction of absorbing material is remarkable when the engine speed is high. Consequently two methods of reducing the noise level are suggested from the identified results. The one is to equip the absorbing material on the outer side of injector and the other is to coat with a soft material or equip a soft ring on the surface of impact.