• Title/Summary/Keyword: Gas regulator

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A Study of Fluid Structure Interaction Analysis and Coating Characteristics of a Two-stage Pressure Reduction Hydrogen Regulator (2단 감압 수소레귤레이터의 연성해석 및 도금특성에 관한 연구)

  • Song, Jae-Wook;KIM, Seung-Mo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.22 no.1
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    • pp.37-44
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    • 2021
  • In this study, shape design and material selection were carried out for a two-stage pressure-reducing regulator to compensate for the shortcomings of a one-stage mechanical decompression regulator. The shape of the contact surface of the depressurization unit was considered, material was selected, and the shape was designed to compensate for the pulsation and slow response through the two-stage decompression and to solve the problem of high pressure deviation. In terms of airtightness, the deformation amount of TPU showed a small amount of displacement of up to 15.82%. Considering the fact that it is applicable to various hydrogen fuel supply systems by securing universality by applying electronic solenoids to the second pressure reduction, magnetic materials were selected. The hydrogen embrittlement and corrosion resistance were evaluated to verify the plating process. Surface corrosion did not occur in only the case of Cr plating. The elongation during the corrosion process was compared using a tensile test, and there was a difference within 2%.

A Comparative Study on the Energy Efficiency due to the Capacity of Gas Boiler (가스온수가열기의 용량에 따른 에너지효율성 비교 연구)

  • Kim, Seong Jung;Woo, In sung
    • Journal of the Korea Safety Management & Science
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    • v.17 no.2
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    • pp.229-234
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    • 2015
  • Depending on the living styles, the types of energy consumed by households have changed, and the consumption has increased rapidly. Consequently, those have led to environmental issues, such as exhaustion of energy and the climate changes. As one of solutions to such issues, energy efficiency can be approached. Therefore, in this study, the gas water heater(115S type Rheem products) that made in Germany and obtain hot water using gas as a heat source is selected. a $1.0m^3$ water tank with a 6kW electronic heater is installed and a water temperature and pressure is maintain constantly also thermometer is injected. Two of gas meter, one of pressure regulator and three of time measurement devices are installed in a combustion facility and fuelling facility with a magnet valve so it can observe and record combustion reactions. Quantity of hot water that heated by boiler is recorded using a quantity measurement tank, and have been heated by the boiler have been to record and measure the amount and utilized the data acquired through measurement of all factors that are applied to acquire hot water in order to calculate the use rate of final energy. In conclusion, this researcher drew the economic strong points of the hot water generated by gas.

A Development of Converting Technology for the Marine Gasoline/CNG Bi-fuel Engine (선박용 가솔린/CNG Bi-fuel 엔진개조 기술 개발)

  • Park, Myung-Ho
    • Journal of Advanced Marine Engineering and Technology
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    • v.34 no.5
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    • pp.632-637
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    • 2010
  • Natural gas, a fossil fuel contained mostly of methane, is one of the cleanest alternative fuels. It can be used in the form of compressed gas(CNG) or liquefied natural gas(LNG) to cars and trucks. And, dedicated natural gas vehicles are designed to run on natural gas only, while Bi-fuel vehicles can also run on gasoline or CNG, especially, bi-fuel can be defined as the simultaneous combustion of two fuels. In this study, converted gasoline marine system to CNG Bi-fuel system which is made up of injector, regulator, tank and ECU is converted. And estimated the fuel system and engine power compared the result with gasoline engine is estimated. As a result, CNG engine shows low exhaust emissions but maxium power is 7% reduced compared to gasoline engine.

A Study on the Odorization Levels and Management in the Facility using Liquified Natural Gas(LNG) (액화천연가스(LNG) 사용시설내의 부취농도 분포 및 관리방법에 관한 연구)

  • Won, Seung Yeon;Shin, Hun Yong
    • Journal of the Korean Institute of Gas
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    • v.23 no.6
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    • pp.25-32
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    • 2019
  • In many mass-consumption gas facilities, natural gas is not supplied through the pipeline of the gas corporation. LNG is supplied from the gas corporation through the tank lorry to be vaporized. In order to prevent human or property damage due to gas leakage at these facilities, a study was conducted to analyze the concentration of odorant injected at the initial and consumption points. An analysis was performed to confirm the change in odorant concentration according to the pipe position in the gas facility when a constant flow rate flowed. For this study the gas samples were taken with aluminium cylinders(4.5 L) which were created a vacuum at the pressure regulator in which the odorants was injected and the points using the gas. Odorant levels of the samples were analyzed by Gas chromatography(Main Body : Agilent 7890A, Detector : ANTEC 7090).We suggest that the small facilities using LNG need to make the management system by the types of facilities for maintaining the odorization system.

Development of Leakage Judgment Technique based on Pressure Data of Smart Gas Meter (스마트 가스 계량기 압력 데이터 기반 누출 판단 기법 개발)

  • Jung-Hoon Kim;Jung-Suk Oh;Jin-Han Lee
    • Journal of the Korean Institute of Gas
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    • v.27 no.2
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    • pp.57-64
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    • 2023
  • As the meter reading method of gas meters develops, smart gas meters capable of remote meter reading (leak checking meters and multi-function safety meters) are being used. These meters have a function to judge leakage by utilizing the flow rate and pressure data collected as an additional function. Leakage judgment function using flow rate data has valid cases in the actual field, but the pressure data-based leakage judgment standard is based on not only the pressure value change due to leakage but also various factors (pressure regulator pressure, connection with adjacent meters, usage of adjacent houses, location of meters, etc.). There is a problem with pressure magnitude changes (levels). In this paper, as a technique that can judge leaks by using pressure data collected from smart gas meters, it was developed through preprocessing of pressure data, criteria for pressure value ranges related to leaks, leak judgment techniques, and application case verification.

Formation of Secondary Products by Plant Cell Culture - II. Effects of Growth Regulators on the Formation of Capsaicinoide, Phenylpropanoids and PAL Activity in Cultured Cell of Capsicum annuum L. - (식물세포(植物細胞) 배양(培養)에 의(依)한 이차대사산물(二次代謝産物)의 생성(生成)에 관(關)한 연구(硏究) - II. Capsicum annuum L.의 배양세포(培養細胞)에 있어서 Growth Regulator가 Capsaicinoids, Phenylpropanoids 생성(生成) 및 Phenylalanine Amnonia-lyase (PAL) 활성(活性)에 미치는 영향 -)

  • Choi, Bong-Soon
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.16 no.1
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    • pp.10-17
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    • 1987
  • In order to investigate the effects of growth regulators on the formation of capsaicinoids in callus of Capsicum annuum L. tissues were cultured in the Linsmaier and Skoog RM 1964 medium containing various growth regulators. Production of capsaicinoids during culture was monitored by gas chromatography. In the presence of $10^{-6}M$ of 2,4-D and kinetin in the medium, $1182{\mu}g$ of capsaicinoids were formed per 100g dry wt. of tissue, of which was greater than with any of three other growth regulators. IAA, NAA, and kinetin of same concentrations had 65%, 38%, 68% effect of 2.4-D in capsaicinoids formation, respectively. Production of capsaicinoids increased gradually in the presence of 2,4-B as culture period was proceeded. Of phenylpropanoids formed, cinnamic acid and coumaric acid were not significantly different in their levels, although growth regulators were varied. On the other hand, caffeic acid and ferulic acid formation were highest in the presence of 2,4-D. Effects of kinetin and IAA were about 70 percent of that of 2,4-D, whereas NAA had only about 30 percent effect. Phenylalanine ammonia-lyase activity in cultured tissue was increased during the periods; 52, 81, and 209 n moles of cinnamic acid per g fresh wt. were formed after 5, 15, and 25 days of culture, respectively.

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A Study on the Safety Improvement of City Gas Pressure Regulators in Apartment Housing (공동주택 등에 설치하는 도시가스 압력조정기의 안전성 향상에 관한 연구)

  • Youngman Yun;Yongchai Kwon;Kyungho Kim;Jihyun Jang
    • Journal of the Korean Institute of Gas
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    • v.27 no.2
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    • pp.86-94
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    • 2023
  • This study was conducted with the purpose of preparing an alternative to improving the safety of civil pressure regulators installed instead of gas governors to supply city gas to apartment houses. First, problems were derived and solutions were presented by investigating the safety standards and installation status of domestic pressure regulators. In addition, using the DNV Phast-Safeti program, a quantitative risk assessment solution, risks such as gas leakage contained in pressure regulators installed in apartment houses and surrounding gas facilities were evaluated in terms of individual risks and societal risks, and measures were derived to reduce the risks in the installation and management of the pressure regulators.

The Design of Gas Turbine Automatic Voltage Regulator for Jeju Thermal Power Plant (제주화력 가스터빈 자동전압조정기 프로토타입 설계 및 시험에 관한 연구)

  • Kim, Bong-Suck;Ryu, Ho-Seon;Lee, Joo-Hyun
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.494-496
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    • 2007
  • 자동전압조정기는 발전기의 출력 전압을 측정하여 발전기 단자 전압과 계자 전류를 제어하며, 발전기 여자시스템 보호/제한 기능을 수행한다. 본 논문에서는 전력연구원이 개발한 가스터빈 자동전압조정기 프로토타입의 소프트웨어와 하드웨어에 관하여 소개하고, 실험을 통하여 건전성을 확인하였다.

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Optimum Design Method for Pressure-reducing System using High-pressure Gas (고압가스감압시스템 최적화 설계기법)

  • Chung, Yong-Gahp;Cho, Nam-Kyung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.748-751
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    • 2010
  • To launch rocket on launch pad, propellants and gases are charged into the rocket by remote control system. Using pneumatic pressure-reducing regulators, kinds of gases with various pressure levels are supplied into launch pad. As most of operations for launching the vehicle are remotely controled in the launch control room, pressure pulsations due to rapidly gas supply at the upstream of regulators can make the required operating pressure range missed and cause damage to the regulators. In this paper, the optimum design methods of pressure regulators of pressure-reducing system on launch pad using high-pressure gases were investigated to solve the aforementioned problems and for stable gas supply to launch pad.

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