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조은성,성용진,정석호,Cho, Eun-Seong,Sung, Yong-Jin,Chung, Suk-Ho 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.1
Staged combustion, such as air- and fuel-staging, is a relatively well-known technique fur reduction of NOx emission and used in combination with other techniques nowadays. However, the design variables are still selected depending upon operating conditions. There are many variables tested to investigate the NOx emission characteristics fur changing of fuel or air velocity, swirl intensity, and staging ratio of air and fuel in multi-staged burner. In air-staging case, the fuel-rich condition of the primary combustion zone is very helpful to reduce NOx emission and its range is known to be restricted by the increase of carbon monoxide. However, in many cases carbon monoxide level is not too high to be restricted operating condition. So we tried to expand the equivalence ratio range to the richer condition in the primary combustion zone and certificate the function of each burner component and its contribution to the overall NOx production.
평판형 예혼합 버너의 화염면 매질에 따른 연소 특성 연구
조은성(Eun-Seong Cho),신성철(Seong-Chul Shin),김용범(Yong-Bum Kim),최경석(Kyung-Suhk Choi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The premixed burner is a very strong candidate for using household boiler burner system because it can make high efficiency, low emission and compact boiler system. Usually the household boiler burner system used as a bunsen type burner which consisted of inner rich premixed flame and fuel burned completely by secondary air supply. It has a relatively long flame length and operates in a high excess air ratio so it is difficult to fit the high efficiency compact boiler. In this paper, we were tested the characteristics of premixed combustion burner for the surface medium such as metal fiber, ceramic, and SUS fin. Above all, the cold flow characteristics of surface material has been tested and adjusted the even flow velocity over the burner surface. The combustion test was done by taking flame pictures and measuring flame temperature. The CO and NO<SUB>x</SUB> were measured and evaluated each characteristics of surface burner material for various excess air ration and heating value.
평판형 예혼합 버너의 다양한 화염면 매질 및 열교환기에 따른 연소 특성
조은성(Eun Seong Cho),박창권(Chang Kwon Park),최경석(Kyung Suhk Choi) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.10
예혼합 버너는 높은 효율과 낮은 배기 때문에 가정용 보일러 버너 시스템에 매우 강력한 버너이다. 일반적으로 가정용 보일러 버너는 내부에 농후한 예혼합 불꽃으로 구성하고 연료는 2차공기의 공급에 의하여 완전연소 되는 분젠 버너를 이용한다. 이것은 상대적으로 긴 불꽃 길이와 높은 과잉공기비에서 작동하기 때문에 높은 효율을 갖는 소형 보일러에 적용하기 어렵다. 이 논문에서 메탈 화이버, 세라믹, SUS 핀과 같은 매질을 사용하는 예혼합 연소 버너의 특징을 실험하였다. 특히, 표면 매질의 비반응 유동 특성은 버너 표면 전체의 유동 속도를 측정하고 조정하였다. 연소 실험은 화염 사진과 화염 온도 측정에 의하여 수행되었다. CO와 NO는 다양한 과잉 공기비와 열량값에 대하여 버너 표면 매질, 연소실, 열교환기의 특성을 측정하고 평가하였다. The premixed burner is a very strong candidate for using household boiler burner system because it has high efficiency, low emission and can be used in compact boiler system. Usually, household boiler burner systems use a Bunsen burner, which consists of an inner rich premixed flame and fuel burned completely by a secondary air supply. It has a relatively long flame length and operates in a high excess of air, so it is difficult to fit such a burner into a high efficiency compact boiler. In this paper, the characteristics of a premixed combustion burner for surface media such as metal fiber, ceramic, and SUS fin were evaluated. In particular, the flow velocity over the burner surface for the cold flow characteristics of the surface material were measured and adjusted. The combustion tests were carried out by taking pictures of the flame and measuring the flame temperature. The amounts of CO and NO were measured and the characteristics of the surface burner materials, combustion chamber, and heat exchangers were evaluated for various excess air ratios and heating values.
조은성(Eun-Seong Cho),신성철(Seong-Chul Shin),임경수(Kyung-Su Lim),박창권(Chang-Kwon Park),김용범(Young-Bum Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Residential cogeneration system is a valuable method to use electrical power and hot water simultaneously. The electric power was made by mechanical engine, fuel cell, and photovoltaic etc. Among them we are interested in the fuel cell cogeneration system especially heat storage unit using condensing gas boiler. To study on the fuel cell residential cogeneration system, we made a heat storage unit which consists of storage tank, condensing gas boiler, water pump, heat exchanger, and piping system. Experiment was done in each component of heat storage system such as tank, water pump, heat exchange and system characteristics of floor heating and hot water supply operating with condensing gas boiler. And then we made 1㎾ PEMFC (Proton Exchange Membrane Fuel Cell) stack with water cooling system which will be linked with heat storage unit. Residential fuel cell power generation systems may be more and more feasible home appliances in the future.
가스터빈 대체연료로서의 와 DME CH₄ 연소특성 비교
조은성(Eun-Seong Cho),윤승석(Seung Suk Yoon),정석호(Suk Ho Chung),안달홍(Dal-Hong Ahn) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
DME (Di-Methyl Ehter, CH₃OCH₃) is currently attracting worldwide attention due to its environmental benign characteristics. Until now it was researched as a alternative fuel of diesel automobile because it is a clean fuel producing low soot. In this present study, we compared the methane (CH₄) fuel as main component of natural gas and DME as a alternative fuel of gas turbine. The combustion characteristic of both fuels are evaluated by numerical calculation and basic experiment. Results show that DME has a higher adiabatic flame temperature and combustion velocity and lower auto ignition temperature than those of CH₄ fuel. Especially, DME shows two stage ignition phenomena at 800K. In the experiment of free jet diffusion flame, CH₄ shows normal yellow diffusion flame which means higher soot but DME shows blue flame as the characteristics of premix flame because DME has a O component. The flame markers of OH* and CH* were measured and compared between CH4 and DME flames. We need further research about DME fuel as the alternative fuel of gas turbine.