• Title/Summary/Keyword: Gas regulator

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MODELING AND SIMULATION FOR GAS PIPELINE SYSTEMS

  • Yoshida, Makoto;Kawato, Takashi;Fujita, Toshinori;Kawashima, Kenji;Kagawa, Toshiharu
    • Proceedings of the Korea Society for Simulation Conference
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    • 2001.10a
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    • pp.335-339
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    • 2001
  • City gas is one of the most important necessities of daily city life and social infrastructures. City gas is delivered to every user through a pipeline network. The gas pressure in the pipeline is regulated by gas regulator. In the pressure control system, characteristics of gas pipeline is as important as characteristics of regulator. There are many reports about the transfer function model of the fluid pipeline. But suitable model about the gas transmission pipeline is not known. In this paper, as the transfer function model of the gas pipeline, new model considering the heat transfer between pipe wall and gas and temperature change of gas is proposed. To evaluate this model, frequency response tests are used. As the result, the proposed model shows a better agreement when compared with the experimental result than conventional models. The results show the effectiveness of the model.

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Investigation of Control Theory on Pressure Drop Characteristics of Pneumatic Regulator for Gas Supply (공압 레귤레이터의 공급압력 강하 제어이론에 대한 고찰)

  • Cho, Nam-Kyung;Chung, Yong-Gahp;Cho, In-Hyun
    • Journal of the Korean Society of Propulsion Engineers
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    • v.15 no.2
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    • pp.74-83
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    • 2011
  • For launcher applications, different from other applications, very high flow rate is required which can lead to supply pressure drop against required setting pressure. The supply pressure decrease is closely related to regulator characteristics. In this paper, supply pressure offset is investigated considering regulators as kinds of control systems. Pressure offset of self-operated regulator is analyzed with sensitive parameter defined as the ratio of valve travel to pressure offset. It is shown that pressure offset of self-operating regulator can be improved by incorporating proportional and integral controls and they can be materialized with pilot regulator systems.

Pressure Drop Characteristics and Control Method of Pneumatic Regulator for Gas Supply (공압 레귤레이터의 공급시 압력강하 특성 및 제어방법)

  • Cho, Nam-Kyung;Chung, Yong-Gahp;Nam, Jung-Won;Cho, In-Hyun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.11a
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    • pp.347-352
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    • 2009
  • Pneumatic system is widely applied to ground facility and launcher on-board system. The main requirements of pneumatic system is to meet pressure and flow requirements of gas consumers. For launcher related applications, different from other applications, very high flow is required which can leads to supply pressure drop against required setting pressure. The supply pressure decrease is closely related to regulator characteristics. In this paper, the characteristics of pneumatic regulator related to supply pressure decrease and the control methods for reducing the pressure offset are reviewed.

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Development of a Shut-off Device of LP Gas Regulator for Home Use (가정용 LP가스 조정기 차단안전장치의 개발)

  • Kim Young-Gyu;Kim Pil-Jong;Kwon Boo-Kil;Park Gyo-Shik;Kim Ji-Youn
    • Journal of the Korean Institute of Gas
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    • v.10 no.3 s.32
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    • pp.54-59
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    • 2006
  • A safety device with shut-off function was developed for preventing intentional accidents that might happen by separating of cutting hoses connected to pressure regulators used in residential LP gas facility. For the verification of function and field adaptability, the safety device with shut-off function was tested in the state of joining the device to the regulator and a field test was carried out at home. This study shows that, at the inlet pressure of 0.07-1.56 MPa, the device shuts off the gas within the 5m length of hose regardless of the installation condition of the regulator. The shut-off flow rate increases in the order of perpendicular upward, horizontal and perpendicular downward. From the results of the field tests carried out at home for 5 months, there appears no problem using a gas range or a boiler. If the developed shut-off device is commercialized and distributed in the market the intentional accidents occurred by cutting or separating hoses can be prevented remarkably.

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A Study on Performance Characteristics with the Control System of CNG Regulator (CNG 레귤레이터의 제어 방식에 따른 성능특성 연구)

  • Seo, Ji-Won;Yang, Jeong-Jik;Kim, Jin-Ho;Lim, Jong-Wan
    • Journal of the Korean Institute of Gas
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    • v.21 no.3
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    • pp.33-38
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    • 2017
  • The domestic vehicles remodeling the "CNG Bi-fuel Kit" are mostly in operation with installing the mechanical regulator applying the Diaphragm. However, due to the material characteristics of Diaphragm and characteristics of mechanical pressure control method, various problems are happening. This study tries to deduce the improvement plan through the checking of performance characteristics according to the pressure control method of CNG regulator and progress of comparative analysis. According to the test result, the decompression method applying the Diaphragm has advantage compared to the method applying the Piston. Furthermore, it was confirmed that through the electronic pressure control, it is possible to improve the general performance of the regulator.

Evaluation of Performance and Service Life of Low Pressure LPG Regulators for Home Use (가정용 LP가스 저압조정기의 성능 및 수명 평가)

  • Kim Young-Gyu;Cho Seok-Beom;Kim Pil-Jong
    • Journal of Energy Engineering
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    • v.15 no.1 s.45
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    • pp.23-27
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    • 2006
  • This paper presents the evaluation of LPG (Liquefied petroleum gas) regulators for home use. For the evaluation, several properties of the regulators were experimentally analyzed, such as the operation of safety device, the adjusting and lock-up pressure, the adjusting spring and the diaphragm, with respect to the used time of the regulators. Experimental results showed that the initial operation performance of regulators were degraded with increase of the service time and also showed that the degradation of the performance and material property could become serious after six-year-use of the regulator.

Overpressure Prevention of Pipeline Attached to Outlet of LPG Vaporizer (온수전열식 기화기 후단 배관내 가스의 이상압력상승 방지방안에 관한 연구)

  • Park Kyo-Shik;Park Heui-Joon;Kim Ji-Yoon
    • Journal of the Korean Institute of Gas
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    • v.5 no.2 s.14
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    • pp.62-68
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    • 2001
  • Overpressure in pipeline attached to outlet of LPG vaporizer has been studied to provide countermeasures to prevent it. The cause of liquefaction in pipeline was reviewed using vapor pressure curve with temperature, pressure, and composition to suggest method of controlling such parameters. Performance of vaporizer has been tested to detect defective design of float ball, and then improved scheme was suggested. Trouble of regulator attached to vaporizer was also studied to give countermeasures.

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Numerical Study on Reduction in Frictional Loss for a Sandwitch Type of Pressure Regulator (정압기의 유체력 손실 저감에 대한 수치해석적 연구)

  • Seo, Dong-Kyun;Lee, Jung-Hoon;Hwang, Jung-Ho;Kim, Kwang-Soo;Kim, Kang-Dae;Kim, Dong-Soo
    • Journal of the Korean Institute of Gas
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    • v.14 no.2
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    • pp.47-52
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    • 2010
  • The development of energy saving system with pressure regulator has recently been received interests. Since the internal geometry in the pressure regulator is small and complex, the frictional loss in it is critical. In this study, the pressure loss with tip size, tip position, and mass flow was investigated using numerical approaches(CFD). The aimed reduction in pressure were achieved as the ratio of t/T was more than 0.8. In addition, there was no effect of the tip position.

Small Hydrogen Regulator for Mobile Fuel Cells (모바일 연료전지용 초소형 수소 레귤레이터)

  • Kim, Hyung-Jin;Seo, Young-Ho;Kim, Byeong-Hee
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.20 no.2
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    • pp.129-132
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    • 2011
  • This paper presents small hydrogen regulator for the mobile fuel cell. Mobile fuel cell is generally classified into open-end type and dead-end type. In the open-end type, flow rate of hydrogen is constantly controlled, while pressure of hydrogen is constantly maintained in the dead-end type. Considering the efficiency and stability of the fuel usage, dead-end type is more suitable with mobile fuel cell. Mobile fuel cell operated by dead-end mode requires hydrogen regulator which controls the hydrogen pressure from 0.1bar to 0.5bar within 3% error. In this paper, small hydrogen regulator (volume of 2.6cc) was fabricated by stainless steel. Regulation characteristics was experimentally evaluated.