• Title, Summary, Keyword: gas generation

Search Result 1,505, Processing Time 0.039 seconds

A Study on the Power Generation Compared to the Capacity of Power Generation Facilities by Energy Sources in Summer Season (하절기의 에너지원별 발전설비용량 대비 발전량에 관한 연구)

  • Kim, Chung Kyun
    • Journal of the Korean Institute of Gas
    • /
    • v.23 no.1
    • /
    • pp.36-40
    • /
    • 2019
  • In this study, we compared the operational rates of natural gas, coal, nuclear power and renewable energy based on the data of power generation and power generation facilities produced in summer season(from June to August) during the last four years(2015~2018). Nuclear power and coal power, which are responsible for basic power generation, were guaranteed to be economical as the actual generation capacity remained 60% higher than the cost of power generation. On the other hand, natural gas generation and new renewable energy generation have a very low actual operation rate of 29.5% and 27.3% compared to investments in power generation facilities, making it difficult to lower the cost of power generation. However, coal generation has structural problems in terms of greenhouse gas, fine dust. On the other hand, natural gas generation is relatively low and even though it is safe, it is difficult to secure economic feasibility as it is bound by a peak power system. Therefore, it is only possible to achieve balanced development of energy sources when there is a change in the development policy.

Effect of Discharge Electrode Shape of a Barrier Discharge Type Gas Pump on Ionic Wind Generation (장벽 방전형 공기 펌프의 이온풍 발생에 미치는 방전전극 형상의 영향)

  • Hwang, Deok-Hyun;Moon, Jae-Duk
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.58 no.5
    • /
    • pp.994-998
    • /
    • 2009
  • Existing cooling technologies no longer provide adequate heat dissipation due to excessive heat generation caused by the growing component density on electronic devices. An ionic gas pump can be used for the thermal management of micro-electronic devices, since the size of pump can be reduced to a micrometer scale. In addition, the gas pump allows for gas flow control and generation without moving parts. This ideal property of gas pump gives rise to a variety of applications. However, all these applications require maximizing the wind velocity of gas pump. In this study a barrier discharge type gas pump, with a needle-shaped corona electrode instead of a plate-shaped corona electrode, has been investigated by focusing on the corona electrode shape on the wind velocity and wind generation yield. As a result, the enhanced wind velocity and wind generation yield of 1.76 and 3.37 times were obtained with the needle-shaped corona electrode as compared with the plate-shaped corona electrode of the proposed barrier discharge type gas pump.

Predicting the Methane Gas Generation Rate at Landfill Sites Using the Methane Gas Generation Rate Constant (k)

  • Chung, Jin-Do;Kim, Jung-Tae
    • Asian Journal of Atmospheric Environment
    • /
    • v.2 no.2
    • /
    • pp.116-124
    • /
    • 2008
  • In this study, the Tier 2 method recommended by the Intergovernmental Panel on Climate Change (IPCC) was used to predict the methane generation rate at two landfill sites, designated as Y and C for purposes of this study, in South Korea. Factors such as the average annual waste disposal, methane emissions ($L_0$) and methane gas generation rate constant (k) were estimated by analyses of waste and the historical data for the landfills. The value of k was estimated by field experiments and then the changes in the methane generation rate were predicted through the year 2050, based on the value of k. The Y landfill site, which was in operation until the year 2008, will generate a total of 17, 198.7 tons by the end of 2018, according to our estimations. At the C landfill site, which will not be closed until the end of 2011, the amount of methane gas generated in 2011 will be 3,316 tons and the total amount of gas generated by 2029 will be 61,200 tons. The total production rate of methane gas at the C landfill is higher than that of the Y landfill. This indicates that the capacity of a landfill site affects the production rate of methane gas. However, the interrelation between the generation rate of methane and the value of k is weak. In addition, the generation of methane gas does not cease even when the operations at a landfill site come to a close and the methane gas production rate is at its highest at end of the operating life of a landfill site.

An Analysis of Greenhouse Gas Emission and Role of Gas Generation in Electric Sector (발전부문 온실가스배출과 가스발전의 역할 분석)

  • Kang, Hee-Jung
    • Journal of the Korean Institute of Gas
    • /
    • v.10 no.4
    • /
    • pp.11-16
    • /
    • 2006
  • The purposes of this study is to develop a domestic MARKAL(MARKet ALlocation) model with construction of database system to find the technology mix for the electricity generation market in Korea. The MARKAL model is officially used for national energy system optimization in the International Energy Agency(IEA), and the role is becoming more important in relation to analyze the greenhouse gas mitigation potential and to evaluate the technologies. Four scenarios specially emphasized on the greenhouse gas reduction and technology mix of electric generation were applied, each of them covering the analysis periods between 2004 and 2040.

  • PDF

High Efficiency Gas Turbine-Fuel Cell Hybrid Power Generation System (가스터빈-연료전지 혼합형 고효율 발전시스템)

  • Lee, Jin-Kun;Yang, Soo-Seok;Sohn, Jeong-L;Song, Rak-Hyun;Cho, Hyung-Hee
    • 유체기계공업학회:학술대회논문집
    • /
    • /
    • pp.347-353
    • /
    • 2001
  • A combined cycle, 'HYBRID', is emerging as a new power generation technology that is particularly suitable for the distributed power generation system, with high energy efficiency and low pollutant emission. Currently micro gas turbines and fuel cells are attracting a lot of attention to meet the future needs in the distributed power generation market. This hybrid system may have every advantages of both systems because a gas turbine is synergistically combined with a fuel cell into a unique combined cycle. The hybrid system is believed to become a leading runner in the distributed power generation market. This paper introduces a current plan associated with the development of the hybrid system which consists of a micro gas turbine and a solid-oxide fuel cell(SOFC).

  • PDF

Performance Characteristics of a 10 kW Gas Engine for Generation Package (발전용 10kW급 천연가스엔진의 성능특성)

  • 이영재;표영덕;김강출;권용호;오시덕
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.15 no.8
    • /
    • pp.697-703
    • /
    • 2003
  • Cogeneration is the simultaneous generation of heat and electricity in a single unit, and is a highly energy-efficient technology compared to the independent generation of both products. Therefore, cogeneration has been widely introduced in many countries for use in industrial, commercial and residential applications. However, there have been few models with an output of less than 100 kilowatt. In the present study, a spark ignited gas engine with electric generation output of 10 kilowatts was developed for micro cogeneration package. The gas engine shows 26.7% of electric generation efficiency, NOx emission less than 10 ppm at 13% oxygen, 82 dB of Noise level, and about 3 seconds of switching time from idling to nominal power.

A study on the bipolar plate of electrolytic cell of hydrogen gas generation system by numerical system (수소가스발생 장치의 전해조의 분리판에 관한 전사모사 연구)

  • Jo, Hyeon-Hak;Lee, Sang-Ho;Jang, Bong-Jae;Song, Ju-Yeong
    • Journal of the Korean Applied Science and Technology
    • /
    • v.27 no.1
    • /
    • pp.61-69
    • /
    • 2010
  • This study is focused on the modeling of two phase fluid flow system in the electrode of hydrogen gas generator. The characteristics of hydrogen gas generation was studied in view of efficiency of hydrogen gas generation rate and a tendency of gas flow through the riv of electrode. Since the flow rate of generated gas is the most crucial in determining the efficiency of hydrogen gas generator, we adopted the commercial analytical program of COMSOL $Multiphysics^{TM}$ to calculate the theoretical flow rate of hydrogen gas from the outlet of gas generator.

A study on the channel design of bipolar plate of electrolytic cell of hydrogen gas generation system by flow dynamic simulation (수소가스발생 장치의 전해조 분라판의 유로설계에 관한 전산모사 연구)

  • Jo, Hyeon-Hak;Jang, Bong-Jae;Song, Ju-Yeong
    • Journal of the Korean Applied Science and Technology
    • /
    • v.27 no.2
    • /
    • pp.152-156
    • /
    • 2010
  • This study is focused on the channel design of bipolar plate in the electrode of hydrogen gas generator. The characteristics of hydrogen gas generation was studied in view of efficiency of hydrogen gas generation rate and a tendency of gas flow through the riv design of electrode. Since the flow rate of generated gas is the most crucial in determining the efficiency of hydrogen gas generator, we adopted the commercial analytical program of COMSOL $Multiphysics^{TM}$ to calculate the theoretical flow rate of hydrogen gas from the outlet of gas generator.

Heating Value and Noxious Gases Generation of Sandwich Panel Core using Artifical Lightweight Aggregate (다공성 경량골재를 충전재로 활용한 샌드위치 패널 심재의 발열량 및 유해가스 배출특성)

  • 노정식;도정윤;문경주;조영국;소양섭
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • /
    • pp.261-266
    • /
    • 2003
  • This study is to investigate the heating value and noxious gases generation such as CO, NO and $SO_2$ known as dangerous gas for human from specimen made of cement and lightweight aggregate. The most quanity of CO gas is generated in EPS(Expanded Poly Styrene), core of commercial sandwich panel. Although specimens mainly composed of cement discharged the relatively less CO gas than organic core such as EPS, specimens which SBR was added discharged the very much amount of CO gas similar to EPS and especially, specimens including foaming agent, gas foaming agent or redipersible powder of VA/VeoVa showed the good properties in the generation of CO gas. From the standpoint of the generation of NO and $SO_2$ gas, both the core of commercial sandwich panel such as EPS, Glass wool and specimens made with polymer dispersion such as St/BA and SBR discharge the very much amount of NO and $SO_2$ gas in comparison of the other specimens. From this study, it was confirmed that organic materials such as core of commercial sandwich panel dischared much more noxious gas than specimens composed of cement and inorganic lightweight aggregate.

  • PDF

Estimation of Methane Generation Rate and Potential Methane Generation Capacity at Cheongju Megalo Landfill Site Based on LandGEM Model (LandGEM 모델을 이용한 청주권 생활폐기물 매립장의 매립지가스 발생상수 및 메탄 잠재발생량 산정)

  • Hong, Sang-Pyo
    • Journal of Environmental Health Sciences
    • /
    • v.34 no.6
    • /
    • pp.414-422
    • /
    • 2008
  • Methane is a potent greenhouse gas and methane emissions from landfill sites have been linked to global warming. In this study, LandGEM (Landfill Gas Emission Model) was applied to predict landfill gas quantity over time, and then this result was compared with the data surveyed on the site, Cheongju Megalo Landfill. LandGEM allows the input of site-specific values for methane generation rate (k) and potential methane generation capacity $L_o$, but in this study, k value of 0.04/yr and $L_o$ value of $100\;m^3$/ton were considered to be most appropriate for reflecting non-arid temperate region conventional landfilling like Cheongju Megalo Landfill. Relatively high discrepancies between the surveyed data and the predicted data about landfill gas seems to be derived from insufficient compaction of daily soil-cover, inefficient recovery of landfill gas and banning of direct landfilling of food waste in 2005. This study can be used for dissemination of information and increasing awareness about the benefits of recovering and utilizing LFG (landfill gas) and mitigating greenhouse gas emissions.