• Title/Summary/Keyword: Turbine Exhaust Gas

Search Result 155, Processing Time 0.031 seconds

Noise and vibration reductions in exhaust duct system of cogeneration power plants (열병합발전소 배기 덕트 시스템의 소음 진동 저감)

  • Kim, W.H.;Joo, W.H.;Bae, J.G.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2004.11a
    • /
    • pp.641-646
    • /
    • 2004
  • Noise and vibration was encountered in exhaust duct system which is connected with a gas turbine and a heat recovery steam generator(HRSG) of a cogeneration power plants. Especially, these problems occurred when water was added to the fuel injection to reduce NOx contents of the exhaust gas. Through the cavity mode analysis and measurements, It was concluded that these problems occurred due to the acoustic resonance between the duct cavity mode and the excitation force induced by turbulent gas flow during water injection. To reduce the noise and vibration, optimal baffle plate to change the cavity mode was installed inside of duct and noise levels of about 8 dB(A) are reduced in duct system. The effects of baffle plate and guide vane to the HRSG or inlet duct vibration were also evaluated and it was verified that there is no relation to the resonance phenomena. So, vibration of inlet duct was easily reduced by the reinforcement of structures.

  • PDF

Experimental Study of the Landfill Gas Fuelled Micro Gas Turbine Exhaust Gas Analysis (매립가스 마이크로가스터빈 배가스 분석에 관한 실험적 연구)

  • Park, Jung-Keuk;Hur, Kwang-Beom;Rhim, Sang-Gyu;Oh, Il-Hong;Lee, In-Hwa
    • New & Renewable Energy
    • /
    • v.7 no.3
    • /
    • pp.67-73
    • /
    • 2011
  • MGT fuelled by landfill gas was tested to asses feasibility of its exhaust gas application for $CO_2$ enrichment. The exhaust gas was analyzed during start-up and normal operation with different MGT load conditions. Due to the changes of air/fuel ratio and combustion mode, $O_2$, $CO_2$, CO and NOx concentration were varied within wide ranges during the MGT start-up. Especially, NOx emissioin level was increased up to 20.01 ppmv. Different tendencies of $O_2$, $CO_2$, CO and NOx concentrations were observed with MGT output changes. $O_2$ and CO concentrations were shown to be decreased and NOx and $CO_2$ concentrations were shown to have opposite trends. NOx emission level (0.8~1.88 ppmv) was very low compared to other types of combustion based power generation equipment. Unburned hydrocarbon emission level was substantially decreased with MGT load increase. Especially, $C_2H_4$ concentration was below the detection limit(0.2 ppmv) around the nominal load condition. The exhaust gas from landfill gas fuelled MGT system was shown to be feasible for $CO_2$ fertilization. Concentrations of major components were within or below the maximum allowable ranges.

A Preliminary Study on Direct Ethanol SOFC for Marine Applications

  • Bo Rim Ryu;To Thi Thu Ha;Hokeun Kang
    • Journal of Navigation and Port Research
    • /
    • v.48 no.2
    • /
    • pp.125-136
    • /
    • 2024
  • This research presents an innovative integrated ethanol solid oxide fuel cell (SOFC) system designed for applications in marine vessels. The system incorporates an exhaust gas heat recovery mechanism. The high-temperature exhaust gas produced by the SOFC is efficiently recovered through a sequential process involving a gas turbine (GT), a regenerative system, steam Rankine cycles, and a waste heat boiler (WHB). A comprehensive thermodynamic analysis of this integrated SOFC-GT-SRC-WHB system was performed. A simulation of this proposed system was conducted using Aspen Hysys V12.1, and a genetic algorithm was employed to optimize the system parameters. Thermodynamic equations based on the first and second laws of thermodynamics were utilized to assess the system's performance. Additionally, the exergy destruction within the crucial system components was examined. The system is projected to achieve an energy efficiency of 58.44% and an exergy efficiency of 29.43%. Notably, the integrated high-temperature exhaust gas recovery systems contribute significantly, generating 1129.1 kW, which accounts for 22.9% of the total power generated. Furthermore, the waste heat boiler was designed to produce 900.8 kg/h of superheated vapor at 170 ℃ and 405 kP a, serving various onboard ship purposes, such as heating fuel oil and accommodations for seafarers and equipment.

A Study on the Efficiency of Fuel Cells for Marine Generators (선박 발전기용 연료전지 시스템의 효율에 관한 연구)

  • Lee, Jung-Hee;Kwak, Jae-Seob;Kim, Kwang-Heui
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.17 no.5
    • /
    • pp.52-57
    • /
    • 2018
  • Most current ships have adopted on-board diesel generators to produce electricity, but the overall efficiency of equipment is down to about 50% due to thermal losses from operations such as exhaust gas, jacket water cooler, scavenge air cooler, etc. Recently, fuel cells have been highlighted as a promising technology to reduce the effect on the environment and have a higher efficiency. Therefore, this paper suggested a solid oxide fuel cell (SOFC)-gas turbine (GT) using waste heat from a SOFC and SOFC-GT-steam turbine (ST) with Rankine cycle. To compare both configurations, the fuel flow rate, current density, cell voltage, electrical power, and overall efficiency were evaluated at different operating loads. The overall efficiency of both SOFC hybrid systems was higher than the conventional system.

Design for Landfill Gas Application by Low Calorific Gas Turbine and Green House Optimization Technology (Low Calorific Gasturbine 매립지 적용 및 유리온실 운용기술 설계)

  • Hur, Kwang-Beom;Park, Jung-Keuk;Lee, Jung-Bin;Rhim, Sang-Gyu
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2010.06a
    • /
    • pp.244.1-244.1
    • /
    • 2010
  • Bio energy development by using Low Calorific Gas Turbine(LCGT) has been developed for New & Renewable energy source for next generation power system, low fuel and operating cost method by using the renewable energy source in landfill gas (LFG), Food Waste, water waste and Livestock biogas. Low calorific fuel purification by pretreatment system and carbon dioxide fixation by green house system are very important design target for evaluate optimum applications for bio energy. Main problems and accidents of Low Calorific Gas Turbine system was derived from bio fuel condition such as hydro sulfide concentration, siloxane level, moisture concentration and so on. Even if the quality of the bio fuel is not better than natural gas, LCGT system has the various fuel range and environmental friendly power system. The mechanical characterisitics of LCGT system is a high total efficiency (>70%), wide range of output power (30kW - 30MW class) and very clean emmission from power system (low NOx). Also, we can use co-generation system. A green house designed for four different carbon dioxide concentration from ambient air to 2000 ppm by utilizing the exhaust gas and hot water from LCGT system. We look forward to contribute the policy for Renewable Portfolio Standards(RPS) by using LCGT power system.

  • PDF

Performance Test of MGT Combined Heat & Power System (마이크로 가스터빈 열병합 발전시스템 성능평가)

  • Hur, Kwang-Beom;Park, Jung-Keuk;Rhim, Sang-Kyu
    • 유체기계공업학회:학술대회논문집
    • /
    • 2006.08a
    • /
    • pp.313-316
    • /
    • 2006
  • As Decentralized Generation(DG) becomes more reliable and economically feasible, it is expected that a higher application of DG units would be interconnected to the existing grids. This new market penetration of DG technologies is linked to a large number of factors like technologies costs and performances, interconnection issues, safety, market regulations, environmental issues or grid connection constrains. Korea Electric Power Corporation (KEPCO) has researched performance characteristics of the 60k W class 1) basic start-up & shutdown operation analysis 2) interconnection test 3) MGT -absorption chiller-heater system in the local condition. Variations of heat recovery from exhaust gas has measured according to micro gas turbine output of 15, 30, 45, 60kW. From those results, the performance of the MGT-absorption chiller/heater system has been evaluated. The suggested strategy and experience for the evaluation of the distributed generation will be used for the introduction of other distributed generation technologies into the grid in the future.

  • PDF

Processes of Outflow of the Boiling Steam-Water Mixture in the Widening Part of Hydro-Steam Turbine Nozzles

  • Leonid, Serejkin;Boris, Shifrin;Victor, Perov;Alexandr, Goldin
    • International Journal of Computer Science & Network Security
    • /
    • v.22 no.12
    • /
    • pp.178-184
    • /
    • 2022
  • Renewable energy sources based on solar radiation, wind energy, geothermal energy, and biomass energy have now reached the level of industrial application. A new way to generate electricity using low-potential heat is to install a hydro-steam turbine. In hydro-steam turbines, hot water is supplied directly to turbine rotor nozzles without prior separation into steam and water in separators, which significantly increases the efficiency of hot water energy use. Such turbines are suggested to be used as autonomous energy sources in geothermal heating systems, heating water boilers and cooling systems of chemical reactors, metallurgical furnaces, etc. The authors conclude that the installation of hydro-steam turbines in heating plants and process boiler plants can also be effective if the used exhaust steam-water mixture at the turbine outlet is used to heat the network water or as return water.

Investigation of the Forging Process of Exhaust Valve for Large Diesel Engine (대형 디젤엔진용 배기밸브의 단조공정에 관한 연구)

  • Kim, Dong-Kwon;Kim, Dong-Young;Suk, Jhin-Ik;Ryu, Seog-Hyeon;Kim, Dong-Jin;Kim, Byung-Hoon
    • Proceedings of the KSME Conference
    • /
    • 2001.06c
    • /
    • pp.627-632
    • /
    • 2001
  • Nimonic 80A superalloy with high-temperature strength and high corrosion-resistance is used in jet engine for aircraft, gas turbine for power plant and marine diesel engine, etc. To develop the manufacturing process of exhaust valve for large diesel engine using Nimonic 80A, various mechanical tests, such as hot compression, microstructure and hardness test have been performed. This results effectively used to set the reasonable forging conditions while hot forging of Nimonic 80A superalloy. Open die and closed die forging experiments are carried out from ESR ingot and finally get a good shaped exhaust valve product.

  • PDF

The Effects of Pulsating Flow on Volumetric Efficiency in the Intake and Exhaust System in a Turbocharged Diesel Engine (흡.배기 시스템의 맥동류가 과급디젤기관의 체적효율에 미치는 영향)

  • Kim, K.H.;Kang, H.Y.;Koh, D.K.
    • Journal of Power System Engineering
    • /
    • v.13 no.4
    • /
    • pp.11-17
    • /
    • 2009
  • This paper deals with the effects of pulsating flow on volumetric efficiency, which may be generated during the gas exchange procedure, due to piston motion, valve event on intake and exhaust stroke and unsteady flow of turbocharger of a three-cylinder four stroke turbo-charged diesel engine. Consequently, volumetric efficiency affects significantly the engine performance; torque characteristics, fuel economy and further to emission and noise level. As the expansion ratio became larger the engine speed varies and torque increases, the pressure pulsation in an exhaust gas pipe acts as an increasing factor of intake air charging capacity totally. The phase and amplitude of pressure pulsation in the intake system only affects volumetric efficiency favorably, if it is well matched and tuned effectively to the engine. Thus, to verify the exact phase and amplitude of the pressure variation is the ultimate solution for the air-flow ratio assessment in the intake stroke. Some experimental results of pressure diagrams in the intake pipe and gas-flow of turbine in-outlet are presented, under various kinds of operating condition.

  • PDF