• Title/Summary/Keyword: Gas Supplies

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Modeling and Simulation of the Pneumatic Part in a Cold Gas Blow-Down Type Hydraulic Actuation System for a Missile (상온기체 블로우다운 방식을 사용한 유도무기용 유압식 구동장치의 공압부에 대한 모델링 및 시뮬레이션)

  • Park, Hee Seung
    • Journal of Drive and Control
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    • v.13 no.3
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    • pp.1-7
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    • 2016
  • A cold gas blow-down hydraulic actuation system is widely used in missiles that require an actuation system with a fast response time under a limited space with a short operating time and large loads on the actuators. The system consists of a pneumatic part that supplies the regulated high-pressure gas to a reservoir, and a hydraulic part that supplies pressurized hydraulic oil to the actuators by the pressurized gas in the reservoir. This paper proposes a mathematical model to analyze and simulate the pneumatic part of an actuation system that supplies the operating power to the actuators. The mathematical model is based on the ideal gas equation and also considers the models for heat transfer. The model is applied to the pressure vessel and the gas part of the reservoir, and the model for the pneumatic part is established by connecting the two models for the parts. The model is validated through a comparison of the simulation results with the experimental results. The comparison shows that the suggested model could be useful in the design of the pneumatic part of a cold gas blow-down type hydraulic actuation system.

The Energy Performance & Economy Efficiency Evaluation of Micro Gas Turbine Installed in Hospital (대형병원 건물에 마이크로 가스터빈 적용을 위한 에너지성능 및 경제성 평가)

  • Kim, Byoung-Soo;Hong, Won-Pyo
    • Journal of the Korean Solar Energy Society
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    • v.29 no.5
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    • pp.8-13
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    • 2009
  • Feasibilities of the application of a micro gas turbine cogeneration system to a large size hospital building are studied by estimating energy demands and supplies. The energy demand for electricity is estimated by surveying and sorting the consumption records for various equipment and devices. The cooling heating, and hot water demands are further refined with TRNSYS and ESP-r to generate load profiles for the subsequent operation simulations. The operation of the suggested cogeneration system in conjunction with the load data is simulated for a time span of a year to predict energy consumption and gain profile. The simulation revealed that the thermal efficiency of the gas turbine is about 30% and it supplies 60% of the electricity required by the building. The recovered heat can meet 56% of total heating load and 67% of cooling, and the combined efficiency reaches up to 70%.

The Development of the Real Time Optimal Byproduct Gas Supply System

  • Kim, Jeonghwan;Yi, Heui-Sok;Chonghum Han
    • 제어로봇시스템학회:학술대회논문집
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    • 2002.10a
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    • pp.69.6-69
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    • 2002
  • The optimal byproduct gas supply system was developed for the optimal management of the byproduct gases in the iron and steel making process based on EXCEL environment. It supplies optimal byproduct gas distribution result as well as analysis including expected electricity generation, holder level change, amount of oil consumption, energy distribution to each boiler, and efficiency of energy resource. To reflect the changing environment of the plant such as maintenance, the system was developed to easily change the optimization model for changing configuration of the system. To verify the performance of the system , case studies for various situation was performed with the developed system, a...

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The Role of Innovative Energy Public Firms' Channels according to Shale Gas for E-Convergence Economy.

  • Seo, Dae-Sung;Kim, Seung-Ryeol
    • Journal of Distribution Science
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    • v.14 no.5
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    • pp.17-26
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    • 2016
  • Purpose - The E-convergence economy is requested with the economic change of the diverse energy supplies, according to the exploits of Shale gas. By analyzing the electric energy supply and demand in accordance with the various cases, it has proved indirectly to create a convergence economy. Research design, data, and methodology - The research design would make realize its potential change with which government or companies have focused on the energy objection between Shale gas and Electric vehicles. Results - The paper suggests that Shale gas has expanded with the emphasis on the Electrical convergence economy or EVs. Due to these results, they also show why it should not be delayed in the development of shale gas and electric vehicles at the same time. Conclusions - All this is from the reason of opening the E-convergence economy over time. It is required that Korea should prepare E-convergence economy. Public regional energy should be present through the consistent selection of development for energy linking E-economy and E-trans distribution.

Start-up Analysis and Commissioning Test of LCI System for 183MW Large Synchronous Machine (183MW 대용량 동기기 구동 LCI 시스템 기동운전 분석 및 시험)

  • Ryu, Hoseon;Cha, Hanju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.5
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    • pp.626-631
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    • 2013
  • Gas turbine systems are applied extensively in energy supplies to cover peak load requirements. The gas turboset must be accelerated by starting device up to 60%~80% of rated speed to ignite the gas turbine. Recently, the most favorable and economical starting device is the LCI(Load Commutated Inverter). The LCI runs up the gas turboset by feeding the generator as a synchronous motor. In this paper, we discuss in detail the driving principles and features of 183MW gas turbine system. During field application of LCI system, many tests have been conducted and the results were described in this paper. The test results will be considered as the important resources for development in future.

A Study on the extent of damage from fire accident Caused by Unloading of LPG Bulk Lorry (LPG 벌크로리 충전중 화재사고에 따른 사고피해영향범위에 관한 연구)

  • Lee, Myoung Ho;Lee, Su-Kyung
    • Journal of the Korean Institute of Gas
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    • v.19 no.2
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    • pp.1-4
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    • 2015
  • The study analyses secondary damage of surrounding facilities from the fire accident by Unloading of LPG Bulk Lorry. Potential risk and extent of damage from jet flame and radiation heat is estimated with PHAST-RISK v6.7 program of DNV. According to above study, supplies can predict the damage range from gas release by Unloading, and be able to respond quickly.

Development of a GVT (Gas Valve Train) Control System for LNG Fueled Vessels (LNG 추진 선박 엔진용 GVT 제어 시스템 개발)

  • Kang, Inpil;Kim, Kyu-Cheol
    • Journal of Power System Engineering
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    • v.21 no.4
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    • pp.70-76
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    • 2017
  • This paper presents the development of a Gas Valve Train (GVT) control system which is the core equipment of LNG fueled vessels. Due to the increasing worldwide demand for echo friendly green ship products, domestic companies urgently require to develop a core equipments for the LNG fueled vessels to secure worldwide markets in marine engineering. A LNG fueled engine generally equips the GVT, a fuel supply system that steadily supplies clean high-pressure LNG to the engine. The GVT requires a safety operational control system that can prevent any gas leakage accident, and a system that monitors operation status in real time. Therefore, we introduces a development for GVT control and monitoring system design and the design was systematically performed by means of functional analysis and differentiation of foreign advanced products.

Pre-feasibility Study in Mongolia Tavan Tolgoi Coal Bed Methane (Tavan Tolgoi Coal Bed Methane에 대한 몽골에서의 타당성 조사)

  • CHO, WONJUN;YU, HYEJIN;LEE, JESEOL;LEE, HYUN CHAN;JU, WOO SUNG;LIM, OCKTAEK
    • Transactions of the Korean hydrogen and new energy society
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    • v.29 no.1
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    • pp.124-129
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    • 2018
  • Methane is the cleanest fuel and supplies by many distributed type: liquefaction natural gas (LNG), compressed natural gas (CNG), and pipeline natural gas (PNG). Natural gas is mainly composed by methane and has been discovered in the oil and gas fields. Coal bed methane (CBM) is also one of them which reserved in coalbed. This significant new energy sources has emerge to convert an energy source, hydrogen and hydrogen-driven chemicals. For this CBM, this paper was written to analyze the geological analysis and reserves in Mongolian Tavan Tolgoi CBM coal mine and to examine the application field. This paper is mainly a preliminary feasibility report analyzing the business of Tavan Tolgoi CBM and its exploitable gas.

A study of the hazard of fire and explosion due to electric charge by Gas-Solids flow in pipeline

  • Chung Jae Hee;Seo Dae Won;Koo Ja Hyeuk;Kim Sung Jun;An Heau Seak;Kim Joon Ho;Hong Sung Kyung;YAMAGUMA Mizuki;KODAMA Tsutomu
    • Journal of the Korean Institute of Gas
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    • v.4 no.3 s.11
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    • pp.33-38
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    • 2000
  • When fire and explosion accidents have occurred due to a leak of the flammable gas involving the LNG & LPG in an industrialized society, it is a very important problem. Accordingly, in this paper, we have compared and analyzed the occurrence transition and the electrostatic energy according to dust supplies and pressure variations for the electric charge due to the gas-solids of pipe flow. As the experimental results, if dust amounts and the initial pressure increased, electric charge in the pipe and the exit increased. The Specific charge of $Fe_2O_3$ increased proportionally if the initial pressure increased but if the quantity of dust increased, the specific charge decreased. Energy increased significantly as the dust amounts and the initial pressure increased. The possibility of fire and explosion exist in the measuring point(M 1) and the Faraday cage if natural gas and LPG were used.

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The Determinants and their Time-Varying Spillovers on Liquefied Natural Gas Import Prices in China Based on TVP-FAVAR Model

  • Ying Huang;Yusheng Jiao
    • Journal of Information Processing Systems
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    • v.20 no.1
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    • pp.93-104
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    • 2024
  • China is playing more predominant role in the liquefied natural gas (LNG) market worldwide and LNG import price is subject to various factors both at home and abroad. Nevertheless, previous studies rarely heed a multiple of factors. A time-varying parameter factor augmented vector auto-regression (TVP-FAVAR) model is adopted to discover the determinants of China's LNG import price and their dynamic impacts from January 2012 to December 2021. According to the findings, market fundamentals have a greater impact on the import price of natural gas in China than overall economic demand, financial considerations, and world oil prices. The primary determinants include domestic gas consumption, consumer confidence and other demand-side information. Then, there are diverse and time-varying spillover effects of the four common determinants on the volatility of China's LNG import price at different intervals and time nodes. The price volatility is more sensitive and long-lasting to domestic natural gas pricing reform than other negative shocks such as the Sino-US trade war and the COVID-19 pandemic. The results in this study further proves the importance of domestic natural gas market liberalization. China ought to do more to support the further marketization of natural gas prices while working harder to guarantee natural gas supplies.