• Title/Summary/Keyword: Exhaust gas storage system

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Design of the test facility for the supersonic thrust vectoring nozzle (초음속 추력편향 노즐 실험장치 설계)

  • Jeong, Han-Jin;Choi, Seong-Man;Chang, Hyun-Soo
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.569-572
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    • 2010
  • In order to study the performance characteristics of the thrust vector nozzle, the test facility and instrumentation system were designed. In this system, axial thrust, moment, exhaust gas velocity and pressure will be measured by using the scale down experimental model devices. The test facility are composed of high pressure air storage system, flow measuring and control system, test nozzle and thrust measurement system.

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Performance Analysis of an Oxy-fuel Combustion Power Generation System Based on Waste Heat Recovery: Influence of CO2 Capture (배열회수형 순산소연소 발전시스템의 성능해석: CO2 포집의 영향)

  • Tak, Sang-Hyun;Park, Sung-Ku;Kim, Tong-Seop;Sohn, Jeong-Lak;Lee, Young-Duk
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.33 no.12
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    • pp.968-976
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    • 2009
  • As the global warming becomes a serious environmental problem, studies of reducing $CO_2$ emission in power generation area are in progress all over the world. One of the carbon capture and storage(CCS) technologies is known as oxy-fuel combustion power generation system. In the oxy-fuel combustion system, the exhaust gas is mainly composed of $CO_2$ and $H_2O$. Thus, high-purity $CO_2$ can be obtained after a proper $H_2O$ removal process. In this paper, an oxy-fuel combustion cycle that recovers the waste heat of a high-temperature fuel cell is analyzed thermodynamically. Variations of characteristics of $CO_2$ and $H_2O$ mixture which is extracted from the condenser and power consumption required to obtain highly-pure $CO_2$ gas were examined according to the variation of the condensing pressure. The influence of the number of compression stages on the power consumption of the $CO_2$ capture process was analyzed, and the overall system performance was also investigated.

The Concentration Measurements of Toxic Exhaust Gas by Tunable Diode Laser Absorption Spectroscopy System (TDLAS 시스템을 이용한 유해 배기가스의 농도 계측)

  • Cha, Hak-Joo;Kim, Min-Soo;Shin, Myung-Chul;Kim, Se-Won;Chun, Kwang-Min
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.222-227
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    • 2003
  • Recent advances in room-temperature, visible and near-IR diode laser sources for telecommunication, optical data storage applications are enabling combustion diagnostics system based on diode laser absorption spectroscopy. In contrast to some traditional sampling-based gas-sensing instruments, tunable diode laser absorption spectroscopy system is advantageous because of their non-invasive nature, high sensitivity, fast response time and real-time measurement capability. So, combined with fiber-optics and high sensitive detection strategies, compact and portable sensor system arc now appearing for a variety of applications. The objective of this research is to take advantage of distributed feed-back diode laser and measure the $CO_{2}$ concentration (by using direct absorption and wavelength modulation spectroscopy methods). In addition to survey spectra of $CO_{2}$ bands and spectroscopic parameters between 1565 and 1579 run were computed at temperatures between 296 and 1200 K (by using HITRAN 2000 database). It experimentally found out that the features of direct absorption and wavelength modulation spectroscopy methods.

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Development of Technology for Network Construction using Wide Area Energy (광역에너지이용 네트워크 구축 기술개발)

  • Kim, Lae-Hyun;Chang, Won-Seok;Hong, Jae-Jun
    • Journal of Energy Engineering
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    • v.17 no.3
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    • pp.125-138
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    • 2008
  • In order to diversify energy source and to utilize it effectively, it requires to construct an integrated energy management system in a wide area. This research paper explores the core technology of network construction using wide area energy and applies the technology to the field. In specific, it examines the business model by developing l) construction technology of optimum integrated system for thermal supply on wide area network related IT technology, 2) technology of unutilized energy as heat pump using exhaust gas latent heat, and 3) thermal transportation and storage technology using various sources, and by evaluating the applicability and marketability of the model in the field.

Study of Characterization for Lean NOx Trap Catalysts Utilizing a Bench-Flow Reactor System (Bench-Flow Reactor System을 이용한 Lean NOx Trap 촉매의 특성 연구)

  • Yoon, Cheon-Seog;Kim, Hak-Yong;Nguyen, Ke
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.5
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    • pp.179-189
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    • 2008
  • The performance of Lean NOx Trap (LNT) based on the catalysts of Pt/K/Ba/$\gamma-Al_2O_3$ with proprietary washcoat formulation is studied using a bench flow reactor system. To investigate the effect of temperature and gas hourly space velocity (GHSV) on the nitrogen oxides (NOx) trapping capacity as well as NOx breakthrough time and final ratio of $NO_2$ to NO of LNT, series of adsorption isotherms are carried out with simulated exhaust gases of the lean burn engines. Since typical operation of LNT requires periodic regeneration with a short rich excursion, where the stored or trapped NOx is released and subsequently reduced to $N_2$, the effect of the duration of lean and rich phase and type of reductants on the NOx conversion is investigated. NOx storage capacity and breakthrough time obtained from adsorption isotherms shows a volcano-type dependence on the temperature with a maximum NOx storage capacity occurring $350^{\circ}C$ and with a maximum breakthrough time occurring $400^{\circ}C$ at all GHSVs investigated in this study. Also, maximum ratio of $NO_2$ to NO is obtained at $400^{\circ}C$ with a GHSV of $75,000\;hr^{-1}$ Lean/rich cycle of 100 s lean and 5 s rich used with a concentration of 1.33% of $H_2$ and 4% of CO in the rich phase is found to be optimum at operating temperature of $350^{\circ}C$ and a GHSV of $50,000\;hr^{-1}$.

Development of Preheating Module for Domestic Heating Facility, Using PCM(Phase Change Material) Thermal Storage Equipment (상변화물질(PCM)을 이용한 가정용 보일러의 잠열축열식 예열모듈 개발)

  • Son, Chul-Min;Kim, Tae-Wook;Na, Kyu-Dong
    • Journal of the Korean Society of Industry Convergence
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    • v.12 no.3
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    • pp.163-169
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    • 2009
  • A preheating module for domestic heating facility will increase a energy efficiency. That collects the wasted heat of exhaust gas and saves the energy. So a heating load is decreased because of a preheating that has a heating energy. Using of a preheating module, a boiler can reduce frequent operation of a burner. So it is increased persistence, decreased discharging noxious gases. Therefore we will intend to develop a heating facility that is a convenient system for the saving energy.

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Comparison of Combustion, Emissions and Efficiency Characteristics as Varying Spark Timings and Excess air ratios in an Ammonia-fueled Direct Injection Spark Ignition Engine (직접분사식 암모니아 전소 엔진에서 점화 시기와 공기과잉률의 변경에 따른 연소 및 배기, 효율 특성 비교)

  • Yonghun Jang;Cheolwoong Park;Yongrae Kim;Young Choi;Chanki Min;Seungwoo Lee;Hongkil Baek;Jeongwoo Lee
    • Journal of the Korean Institute of Gas
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    • v.27 no.3
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    • pp.1-10
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    • 2023
  • Due to the development of the industrial revolution, regulations on exhaust emissions have been continuously strengthened to reduce the rapidly increasing greenhouse gas emissions. The use of environmentally friendly fuels is essential to meet these regulations. Hydrogen has been attracting attention as a future environmentally friendly fuel, but due to its material properties, it faces significant challenges in handling and storage. As an alternative, ammonia has been proposed. Ammonia can be easily liquefied at room temperature compared to hydrogen and has a high energy density. In order to examine the applicability of ammonia as an engine fuel, experiments were conducted to investigate the effects of changes in combustion control parameters in a direct injection ammonia combustion engine. The experiments were conducted by varying two variables: spark timing and excessive air ratio. Observations were made on combustion stability and the trends of exhaust emissions such as nitrogen oxides and unburned ammonia under the conditions of an engine speed of 1,500 rpm and medium to high loads (brake torque of 200 Nm). By optimizing the combustion control parameters, conditions for stable combustion even when using ammonia as the sole fuel were identified, and plans are underway to apply strategies for future expansion of the operating range.

The Hybrid Rocket Internal Ballistics with Two-phase Fluid Modeling for Self-pressurizing $N_2O$ I (자발가압 성질을 가진 아산화질소의 2상유체 모델링을 통한 하이브리드 로켓 내탄도 해석 I)

  • Lee, Jung-Pyo;Rhee, Sun-Jae;Woo, Kyoung-Jin;Oh, Ji-Sung;Jung, Sik-Hang;Moon, Hee-Jang;Sung, Hong-Gye;Kim, Jin-Kon
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.45-49
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    • 2011
  • The blow-down oxidizer feed system with self-pressurizing $N_2O$ has more advantages than the regulated system. However, it is difficult to predict the exhaust flow rate because there exist two phases in the $N_2O$ tank - liquid phase and gas phase, and the properties of $N_2O$ in storage tank are varied continuously during blow-down. In this paper, a method that can analyse simply the blow-down oxidizer feed system is studied. The properties of saturated $N_2O$ are found from the NIST data base, and mass flow through the orifice is modeled as NHNE. Cold flow test with hybrid rocket combustor is performed for the comparison where the results should found from the good agreement.

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Numerical Investigation on the Urea Melting Characteristics with Coolant and Electric Heaters (냉각수 및 전기 가열 방식에 따른 요소수 해동 특성에 관한 수치해석 연구)

  • Lee, Seung Yeop;Kim, Man Young
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.40 no.1
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    • pp.1-7
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    • 2016
  • A Urea-SCR(Selective Catalytic Reactor) system, which converts nitrogen oxides into nitrogen and water in the presence of a reducing agent, creates a major exhaust gas aftertreatment system for NOx reduction among other compounds. With regard to vehicle applications, a urea solution was chosen based on its eutectic composition of a 32.5wt% urea-water solution. An important advantage of this eutectic composition is that its melting point of $-11.7^{\circ}C$ is sufficiently low to avoid solidification in cold environments. However, the storage tanks must be heated separately in case of low ambient temperature levels to ensure a sufficient amount of liquid is available during scheduled start ups. In this study, therefore, a numerical investigation of three-dimensional unsteady heating problems analyzed to understand the melting processes and heat transfer characteristics including liquid volume fraction, temperature distributions, and temperature profiles. The investigations were performed using Fluent 6.3 commercial software that modeled coolant and electric heater models based on a urea solution. It is shown that the melting performance with the electric heater is higher than a coolant heater and is more efficient.

Study of NO Storage and Reduction on LNT by Micro Bench-Flow Reactor (마이크로 벤치-플로우 리액터를 이용한 LNT 촉매의 NO 흡장과 정화성능에 관한 연구)

  • Yoon, Joo-Wung;Hwang, Seung-Kwon;Hwang, In-Goo;Park, Sim-Soo;Lee, Jin-Ha;Yeo, Gwon-Koo
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.8
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    • pp.789-798
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    • 2011
  • We carry out an experimental investigation to analyze the basic performance of NO(nitric oxide) storage in a lean phase and also analyze the NO reduction achieved by the spraying of reducing agents in the rich phase of the exhaust gas in an LNT(Lean NOx Trap). This is an after-treatment system used to reduce the NOx emissions from a diesel engine. If the stored NO is reduced, we measure the outlet concentration downstream of the LNT. The test LNT material used in the experiments is commercial LNT. After being canned into stainless-steel(SUS304), it was built in a micro bench-flow reactor. Compositions of feed gases, three heated and three no heated gases were sprayed upstream of the LNT to analyze the characteristics. We use various temperatures and space velocities as response variables.