• 한국응용과학기술학회지
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• 제35권3호
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• pp.816-825
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• 2018

액화석유가스(Liquefied Petroleum Gas)를 연료(Fuel)로 하는 차량의 실제 운행단계에서 시동 꺼짐 현상 등이 발생한다는 소비자 민원이 접수 된 바 있으며, 최근 유통과정에서 녹 등의 이물질로 인한 소비자 피해 가능성이 제기되어 LPG 잔류물질(Residue) 항목에 대한 관리 필요성이 대두되었다. 본 연구에서는 LPG 국내생산 및 수입사 제품과 실제로 유통되고 있는 LPG의 잔류물질 특성을 연구하였다. LPG 잔류물질을 GC-MS를 사용하여 정성분석을 하였고, ICP-OES를 이용하여 무기물 성분을 분석하였다. GC-MS 분석결과 고무 제조공정을 용이하게 하기 위해 고무에 소량 배합하는 가소제(Plasticizer) 등이 분석되었다. 또한 ICP-OES를 이용한 무기물 분석결과 주로 LPG 생산 시 사용되는 소포제 등에서 유래된 것으로 추정되는 Si와 충전시설 등에 사용되는 그리스 첨가제 성분 등으로 추정되는 P와 Zn도 일부 검출되었다. 본 연구에서 분석된 LPG 잔류물질에 대해서는 녹 등을 유발할 수 있는 성분이 검출되지 않았지만 가소제 및 그리스 첨가제 성분이 LPG 연료계통에 영향을 줄 수 있으므로 적정품질의 고무류 사용과 저비점 그리스 첨가제 사용 확대가 필요할 것으로 보인다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -2
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• pp.1169-1172
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• 2002

This paper presents the development of an expert system for monitoring and control of an oil production facility. The objectives of developing an expert system for the oil production facility are to monitor the Important processing parameters in different sections of the facilities and to control battery operations in real time. By providing consistent, fast, and reliable decision support to operators, the expert system can be used for automated monitoring and control of a petroleum production facility located south of Regina in Saskatchewan, Canada. The system was implemented in Visual Basic 6.0.

• 동력기계공학회지
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• 제20권4호
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• pp.52-62
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• 2016

Nowadays, emissions of a vehicle are been getting by testing on a chassis dynamometer and a test modes. Also, fuel efficiency is calculated by carbon-balance method that is applying the emissions(CO, THC and $CO_2$) to the fuel calculation formular. In Korea, before 2014, the formular did not include the fuel factors (density, net heat value and carbon weight fraction), but the constants were based on the fuel properties of 2000s. So, this formular did not consider a characteristic of test fuel property that was changed when progressing fuel efficiency test. The characteristics of test fuel property which was distributed in domestic have a difference of quality depending on production regions and oil-refining facilities. Because the fuel properties are variable value during refineries, crude oils and blending contents of a bio-fuel, vehicle fuel is changed for each test. Therefore, the fuel qualities need to apply for a fuel economy test. In this paper, changing patterns of a fuel properties were reviewed during history of fuel standards. Also, the appropriateness of the methods was discussed by calculating and comparing fuel economies with the fuel factors and the constants.

• Korean Chemical Engineering Research
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• 제55권5호
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• pp.652-659
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• 2017

In the present research, in order to predict activity coefficient of inorganic ions in electrolyte solution of a petroleum system, we studied 13 components in the electrolyte solution, including $H_2O$, $CO_2$ (aq), $H^+$, $Na^+$, $Ba^{2+}$, $Ca^{2+}$, $Sr^{2+}$, $Mg^{2+}$, $SO_4$, $CO_3$, $OH^-$, $Cl^-$, and $HCO_3$. To predict the activity coefficient of the components of the petroleum system (a solid/liquid equilibrium system), activity coefficient model of Extended UNIQUAC was studied, along with its adjustable parameters optimized based on a genetic algorithm. The total calculated error associated with optimizing the adjustable parameters of Extended UNIQUAC model considering the 13 components under study at three temperature levels (298.15, 323.15, and 373.15 K) using the genetic algorithm is found to be 0.07.

• Journal of Information Processing Systems
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• 제20권3호
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• pp.399-408
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• 2024

The moisture content of crude oil notably affects various aspects of oil production, storage, transportation, and exploration. However, accurately measuring this moisture content is challenging because of numerous influencing factors, leading to a lack of precision in existing detection methods. This inadequacy hinders the progress of China's petroleum industry. To overcome these challenges, this paper proposes a conductivity-based method for measuring crude oil moisture content. By employing an embedded system, we designed a sensor comprising five electrodes. Additionally, we developed signal excitation and signal processing circuits. Moreover, a software program was designed to analyze and compute the output signal using fast Fourier transform operations. This facilitated the identification of flow patterns, computation of relevant flow rates, and establishment of correlation rates based on frequency spectral characteristics. Based on experimental results, we established a functional relationship between measurement parameters and crude oil moisture content. This study enhanced the precision of moisture content measurement, thereby addressing existing limitations and fostering the advancement of China's petroleum industry.

• International Journal of Naval Architecture and Ocean Engineering
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• 제11권2호
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• pp.970-979
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• 2019

Compliant Vertical Access Risers (CVARs) are compliant systems that incorporate a differentiated geometric configuration that allows the exploitation of oil and gas in deepwater fields and enables a number of operational advantages in the offshore system. One of the main features of CVAR systems is that they allow direct intervention procedures to be applied to the well bore, enabling workover operations to be performed directly from the production platform. Based on the principles of virtual work and variation, a static geometric nonlinear equation of CVARs is derived and applied in this study. The results of this study show that the two ends of the riser as well as the transition region are subject to high stress, while the positions of the floating platform exert significant effects on the geometry of the riser configuration. Compliance and buoyancy factors should be set moderately to reduce the CVAR stress. In addition, the buoyancy modules should be placed in the lower region, in order to maximize the operation advantages of CVAR.

• 자원환경지질
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• 제44권2호
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• pp.153-159
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• 2011

본 연구에서는 포괄적 역학모델을 이용하여 석유 생산 시스템의 파이프 내 가스-오일 2상유동에 대한 유동패턴을 결정하였다. 2상의 유체는 운영 인자, 기하학적 변수, 유체 물성 등에 따라 특정의 유동패턴을 나타냈다. 광범위한 기액 겉보기 속도에 대하여 시스템의 인자들을 변화시키면서 유동패턴을 비교하였다. 다양한 인자들 중 경사각과 겉보기 속도가 파이프 내 가스-오일 2상유동의 유용패턴을 결정하는데 가장 지배적인 인자로 나타났다. 파이프 직경, 유체 물성 등의 인자들은 전이 경계선 부근을 제외하면 유동패턴 변화에 제한적인 영향 만을 미쳤다. 역학모델은 실험실 평가나 신뢰성있는 상관식 이용이 불가능할 때 유동패턴을 결정할 수 있는 유용한 도구이다.

• 대한산업공학회지
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• 제40권1호
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• pp.108-117
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• 2014

This study considers warehouse sizing decisions in an integrated single vendor-single buyer production inventory system by incorporating new decision variables and constraints associated with warehouse size into the formulations. Two typical inventory control policies proposed in the literature (i.e., Identical Delivery Quantity and Deliver What is Produced) have been investigated with consideration of warehouse investment costs. The numerical study shows that Deliver What is Produced is less flexible than Identical Delivery Quantity, resulting in the conclusion that the latter would be preferable when considering warehouse investment costs.

• 한국지능시스템학회논문지
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• 제26권5호
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• pp.351-360
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• 2016

Rapid population growth with high living standards and high electronics use for personal comfort has raised the electricity demand exponentially. To fulfill this elevated demand, conventional energy sources are shifting towards low production cost and long term usable alternative energy sources. Hybrid renewable energy systems (HRES) are becoming popular as stand-alone power systems for providing electricity in remote areas due to advancement in renewable energy technologies and subsequent rise in prices of petroleum products. Wind and solar power are considered feasible replacement to fossil fuels as the prediction of the fuel shortage in the near future, forced all operators involved in energy production to explore this new and clean source of power. Presented paper proposes fuzzy logic based Energy Management System (EMS) for Wind Turbine (WT), Photo Voltaic (PV) and Diesel Generator (DG) hybrid micro-grid configuration. Battery backup system is introduced for worst environmental conditions or high load demands. Dump load along with dump load controller is implemented for over voltage and over speed protection. Fuzzy logic based supervisory control system performs the power flow control between different scenarios such as battery charging, battery backup, dump load activation and DG backup in most intellectual way.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2011년도 후기공동학술대회 논문집
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• pp.127-127
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• 2011