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정전 분무를 이용한 미세 물 액적 생성 및 습식 사이클론 적용 방안에 관한 연구
최종원(Jong Won CHOI),정대헌(Dae Hun CHUNG),이계중(Kye Jung LEE),김정근(Jeong Guen KIM),최영찬(Young Chan CHOI),이욱현(Wook Hyun LEE),우영민(Young Min WOO),오상현(Sang Hyun OH),윤민혜(Min Hye YOUN) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
A historically well-known technique for atomizing the liquid water droplets may be electrospray, which is induced by electrostatic charging inside a confined geometry such as needle, nozzle or slit. Based on the Rayleigh’s theory of instability and Taylor’s theory, the electrospray enables to produce fine water droplets as forming a conical shape (Taylor cone) due to the highly concentrated free charge from high intensity of electrical potential between two oppositely charged electrodes. We herein applied this technology to the wet electrostatic precipitator, especially in cyclone structure. The wet electrostatic precipitator has been reported to possess a few flaws such as un-uniform water film formation on the wall, excessive waste water and large energy consumption. Applying the negative potential to the needles and the positive potential to the collector body, we observed sub-100㎛ water droplets are generated by means of an electrospraying process without any pressure. Such highly charged droplets pull the fine particles inside a flue gas, stick to the collector body and then finally free fall down. In this study, we designed and fabricated the electrospray driven wet cyclone electrostatic precipitator, investigating the particle collection performance with the tangential velocity of ~10 m/s at the cyclone inlet, for various voltages and water flowrates. The experimental results show that the effective flowrate through one needle for reaching the PM2.5 collection efficiency of 95% and the power consumption per a needle are measured as 20 ccm and 0.35 W (35 kV and 0.01 mA). Comparing that the the ratio of water to flue gas and power consumptions of the previously commercialized wet electrostatic precipitators for the treatment capacity of 50 CMM have been reported as 1.0 L/m<SUP>3</SUP> and 840 kW, our measurement gave us 0.2 L/m<SUP>3</SUP> and 175 W, which are merely 20% and 20.8% over those of the commercialized one, respectively
축산바이오가스발전시스템 가동 시 발생되는 연소 배기가스 중 SO<sub>2</sub>에 관한 연구
최재준(Choi, Jaejoon),정대헌(Jung, Daehun),박병식(Park, Byungsik),박진성(Park, Jinsung),허창수(Huh, Changsu) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
대체 에너지 자원 중 폐기물의 소화 가스를 이용한 바이오가스 발전은 이산화탄소에 비해 온실효과 영향력에 21배에 해당하는 메탄가스를 연료로 사용하여 환경부하를 저감시키고 에너지를 생산한다. 바이오가스에 포함된 H₂S는 연소 후 SO₂형태로 발생되는데 SO₂는 수분과 반응을 하게 되면 H₂SO₄등의 강한 산성을 띄는 물질로 생성되어 배관 및 발전기에 손상을 주고 저온부식현상을 유발하게 하며, 동물이나 인체에 노출되면 기관지 수축현상이 일어나 호흡기에 영향을 주는 질식성을 띄는 가스이다. 축산바이오가스에 포함된 H₂S의 함유량과 가스엔진의 연소 시 배출되는 SO₂ 배기가스 성분의 관련성을 검증하기 위해 60-65%의 CH₄와 30-35%의 CO₂ 성분의 바이오가스를 50kW급 발전기에서 사용하였고 연소 후 배출되는 가스 성분을 분석하였다.
최재준(Jaejoon Choi),정대헌(Daehun Jung) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
The unpredicted worldwide oil price makes the new energy important than any other period. The biogas energy is one of the most promising energy source. Animal waste biogas can be used not only for the energy source, but also prohibit the problem of waste the earth with it. Among the animal waste gas, the promising gas is from pigs. There are several power plants with the pig waste gas. But there is no code nor regulation for the biogas composition. Toxic element in the biogas can make the engine out of order and lead the toxic exhaust gas also. The code construction for the animal waste biogas is thought to be urgent and necessary. A process for supplying pig waste biogas to power generation system is suggested. Hydrogen sulfide and moisture is the main elimination element. A device for eliminating hydrogen sulfide and moisture is proposed. From the pig waste biogas, hydrogen sulfide is firstly diminished and the moisture is trapped at the cooling system. Finally, the biogas is supplied at the power generation system, electrical power expected to be 50㎾, with a reciprocating engine. The generated electricity is supplied to the grid. This work can present the standard of the animal waste biogas management and constructing power generation system using biogas.
가정용 스털링엔진 열병합발전시스템의 성능 특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung),김혁주(Hyouckju Kim),강석훈(Seokhoon Kang),임용훈(Yonghoon Im),송대섭(Daesup Song) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
The unpredicted worldwide oil price makes the energy efficiency technology be more important than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies. Recently, the household cogeneration system has been the center object of attention because of the loss of power transmission and the reasonable energy consumption policy relative to the household (condensing) boiler producing heat only. Two cogeneration systems based on Stirling engine as primary mover which can produce 1㎾ of electrical output were investigated from various aspects. The electrical efficiency and thermal efficiency of the systems were measured. The experiment was executed at an independent Stirling engine mode, an independent secondary burner mode, and a combined mode. The emission and noise characteristics were also analyzed and compared with each other. The one cogeneration system was superior to the other in the efficiency of electrical power.
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung),임용훈(Yonghoon Im),최영호(Youngho Choi),송대섭(Daesup Song) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The unpredicted worldwide oil price makes the energy efficiency technology be more importance than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies, and recently, the household cogeneration system has been the center object of attention because of the loss of power transmission and the reasonable energy consumption relative to the household (condensing) boiler producing heat only. A tiny, 1kW of electrical output, gas fueled internal combustion engine cogeneration system was investigated. The electrical efficiency and thermal efficiency of the system were measured. With the emission characteristics, the cogeneration system was analyzed. It was showed the gas engine cogeneration system produced the lowest NOx level compared any other cogeneration system due to the three-way catalyst.
1㎾급 스털링엔진 열병합발전시스템의 시동특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung),김혁주(Hyouckju Kim),임용훈(Yonghoon Im),강석훈(Seokhoon Kang),송대섭(Daesup Song) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The unpredicted worldwide oil price makes the energy efficiency technology be more important than any other period. The small size cogeneration system is one of the most representative technology among the energy efficiency technologies, and the Stirling engine cogeneration system has been concerned and investigated continuously due to the several preferable characteristics - low toxic emission, low noise and vibration level, and the various form of fuel. Unlike the reciprocating-internal combustion engine, Stirling engine must have enough time to warm-up inside the cylinder and working fluid for providing certain given power. So the warm-up time and the time for providing the proper electrical power has been investigated by many researchers. A tiny, 1kW of electrical output, gas fueled Stirling engine cogeneration system's cold start-up and warm start-up characteristics were investigated. The cold start-up test was performed at the fully cold condition and the warm start-up test was performed immediately after the Stirling engine perfectly stopped. The electrical output variation with time was mainly investigated and analyzed at various load conditions. The start-up characteristics of a Stirling engine cogeneration system was finally analyzed.
가정용 스털링엔진 열병합발전시스템 운전특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The unpredicted worldwide oil price makes the energy efficiency technology be more importance than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies, and the Stirling engine cogeneration system has been concerned and investigated due to the preferable characteristics - low toxic emission, low noise and vibration level, and the various form of fuel. A tiny, 1㎾ of electrical output, gas fueled Stirling engine cogeneration system was investigated. The electrical efficiency and thermal efficiency of the system were measured. The experiment was executed at an independent Stirling engine mode, independent secondary burner mode, and the combined mode. Part load characteristics of the Stirling engine cogeneration system were investigated also. With the efficiency characteristics, the O₂ and NOx emission characteristics were measured.
가정용 스털링엔진 및 가스엔진 열병합발전시스템의 성능특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung),김혁주(Hyouckju Kim),강석훈(Seokhoon Kang),임용훈(Yonghoon Im),송대섭(Daesup Song) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
The unpredicted worldwide oil price makes the energy efficiency technology be more important than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies. Recently, the household cogeneration system has been the center object of attention because of the loss of power transmission and the reasonable energy consumption relative to the household (condensing) boiler producing heat only. A tiny gas-fueled internal combustion engine cogeneration system and two cogeneration systems based on Stirling engine as primary mover which can produce 1㎾ of electrical output were investigated from various aspects. The electrical efficiency and thermal efficiency of the systems were measured. The emission and noise characteristics were also analyzed and compared with each other. The cogeneration system based on internal combustion reciprocating engine was superior to the others in the efficiency of electrical power but was inferior in the noise and vibration level.
최재준(Jaejoon Choi),김혁주(Hyukjoo Kim),정대헌(Daeheon Jung),박화춘(Hwa-Choon Park) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
The importance of the more efficient cogeneration system is emphasized. Also the more clean energy is needed at recent energy system. The cogeneration system using Lean burn engine is more preferred to the system using Rich burn engine because of the electrical efficiency. Although the cogeneration system using Lean burn engine is economically preferred, because of the NOx emission level, the system using Rich burn engine with 3-way catalyst can only be used in Korea. The NOx regulation level is 50ppm at oxygen level 13%. The cogeneration hybrid system using Lean burn engine is up to be optimized because of the large amount of the extra-fuel at the after-burner system. The after-burner system at different concept was applied. The reduction time for the activation temperature of the DeNOx catalyst was achieved by making a hole between the combustor and boiler. Because of the lowered fuel consumption, the lowered temperature level was optimized by blocking the hole of the boiler The optimized cogeneration hybrid system consumes 76Nm³/h LNG to produce 150㎾ electricity compared to before optimization 103Nm³/h LNG. The system was accurately evaluated and the result is following ; 90% total efficiency, below 10 ppm NOx, 50ppm CO, 25ppm HC. The cogeneration hybrid system can meet the current NOx level and exhaust gas regulation. It can achieve the clean combustion gas and efficient cogeneration system.
이영수(Young-Soo Lee),백영진(Young-Jin Baik),정대헌(Dae-Hun Jung),김진(Jin Kim),엄철준(Chul-Jun Um) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
In order to comply with the global energy crisis and environment problem, it is necessary to research and develop the energy utilization technology with the reduction of the primary energy usage. Although the increasing rate of energy consumption started to attenuate, the entire consumption of energy as well as CO2 emission rate tends to increase steadily along with an economic growth in Korea. The energy demand in Korea increases by annual 3.7% during the period from 2000 to 2006. And it is expected that we should take a charge of the greenhouse gas reduction obligation by the Climatic Change Convention(Kyoto Protocol) during the 2nd pledge period(2013~2017). According to the IEA report in 2005, the emission amount of carbon dioxide is the 10th place in the world, and the increasing rate is 4.7% annually. Considering the economic scale of Korea, the degradation of energy usage is inevitable when the greenhouse gas reduction obligation come into effect. Therefore, effective energy usage is a very important issue to minimize baneful influence on industrial and economic activities.