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액체 점도에 따른 Y-jet 노즐 내부 유동 및 분무 특성의 변화
송시홍,이상용,Song, Si-Hong,Lee, Sang-Yong 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.12
Internal flow characteristics within Y-jet atomizers and the local drop size distribution and cross-sectional averaged drop size at the outside were investigated with the liquid and air injection pressures, mixing port length of atomizers, and the liquid properties taken as parameters. To examine the effect of the liquid viscosity, glycerin-water mixtures were used in this study. The liquid viscosity plays only a minor role in determining the internal flow pattern and the spatial distribution shape of drops, but the drop sizes themselves generally increase with increasing of the liquid viscosity. An empirical correlation for the liquid discharge coefficient at the liquid port was deduced from the experimental results; the liquid discharge coefficient strongly depends on the liquid flow area at the mixing point which is proportional to the local volumetric quality(.betha.$_{Y}$), and the volumetric quality was included in the correlation. Regardless of the value of the liquid viscosity, the compressible flow through the gas port was well represented by the polytropic expansion process(k=1.2), and the mixing point pressure could be simply correlated to the aspect ratio( $l_{m}$/ $d_{m}$) of the mixing port and the air/liquid mass flow rate ratio( $W_{g}$/ $W_{f}$) as reported in the previous study.udy.udy.y.
저 NOx2단 선회 분무식 노즐 개발 및 실기적용 연구
송시홍,김혁필,안상택,이익형,Song, Si-Hong,Kim, Hyeok-Pil,An, Sang-Taek,Lee, Ik-Hyeong 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.12
A study of low NOx atomizer was carried out to reduce nitrogen oxides(NOx) in a liquid fuel burner flame. The basic concept of NOx reduction in this atomizer is the fuel 2-staging combustion which is generated by a single atomizer forming two different stoichiometric flames. Two orifices swirl atomizer was selected and modified to realize this concept, and it was tested to obtain the design process of low NOx atomizer. These experiments were achieved to find out the relationship between the injection pressures and the flow rate, spray angle and drop size of swirl atomizer as well as to confirm the NOx reduction concept in real plant(power boiler). In comparison between experimental and theoretical results, the correct discharge coefficient and spray angle were obtained. In real burning test, NOx reduction rate was reached to above 27% of the case using conventional swirl atomizer.
분사된 미분탄의 편중분포 방지를 위한 내부장치 최적화에 관한 수치 해석적 연구
김혁제,송시홍,박석호,Kim, Hyuk-Je,Song, Si-Hong,Park, Seok-Ho 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.2
Recently, according to increase in the requirement of electric power, a thermoelectric power plant equipped with pulverized coal combustion system is highly valued, because coal has abundant deposits and a low price compared with others. For efficient use of coal fuel, most of plant makers are studying to improve combustion performance and flame stability, and reduce pollutants emission. One of these studies is how to control the profile of particle injection and velocity dependant on coal nozzle configuration. Basically, nozzle which has mixed flow of gas and particle is required to have the balanced coal concentration at exit, but it is very difficult to obtain that by itself without help of other device. In this study, coal distribution and pressure drop in gas-solid flow are calculated by numerical method in nozzle with various shapes of venturi diffuser as a means to get even coal particle distribution. The tentative correlations of pressure drop and exit coal distribution are deduced as function of the height, length and reducing angle of venturi from the calculated results. When coal hurner nozzle is designed, these equations are very useful to optimize the shape of venturi which minimize uneven particle distribution and pressure drop within coal nozzle.
인왕기,이상용,송시홍,In, Wang-Kee,Lee, Sang-Yong,Song, Si-Hong 대한기계학회 1993 대한기계학회논문집 Vol.17 No.7
A simplified one-dimensional analysis has been performed to predict the local pressure distributions in Y-Jet twin-fluid atomizers. Fluid compressibility was considered both in the gas(air) and two-phase(mixing) ports. The annular-mist flow model was adopted to analyze the flow in the mixing port. A series of experiments also has been performed; the results show that the air flow rate increases and the liquid flow rate decreases with the increase of the air injection pressure and/or with the decrease of the liquid injection pressure. From the measured injection pressures and flow rates, the appropriate constants for the correlations of the pressure loss coefficients and the rate of drop entrainment were decided. The local pressures inside the nozzle by prediction reasonably agree with those by the experiments.
이익형(Ik-hyung Lee),송시홍(Si Hong Song),하종광(Jong-Kwong Ha),이건명(Gun-Myung Lee),김상현(Sang-Hyeun Kim),안상택(Sang Ta Ahn),김혁제(Hyuk-Je Kim),강병구(Byong-gu kang),김혁필(Hyeuk-Pill Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
저 NOx 미분탄 버너와 회전형 분리장치 미분기를 근간으로 하는 저공해 고효율 석탄 연소시스템의 기술적인 특징과 적용 사례를 소개하고자 한다. 저 NOx 미분탄 버너에는 특허를 취득한 미분탄 노즐과 유통 변수를 최적화한 air register가 장착되어 연소 중에 발생하는 fuel-NOx를 효과적으로 저감할 수 있다. 그리고 회전형 분리장치미분기애는 특허를 획득한 회전형 분리기가 장착되어 있으며, 회전형 분리기는 미분도를 향상시켜 회중 UBC의 감소 및 연소 안정화에 기여한다. 이러한 특징을 가지는 저 NOx 미분탄 버너와 회전형 분리장치 미분기를 HUVIS(주) 전주공장의 130ton/hr 보일러의 개보수공사에 적용하였다. 본 공사를 통해 회전형 미분기는 200mesh 85%이상의 미분도를 나타내었으며, 저 NOx 버너는 석탄 전소시 170ppm(@6% O2)의 NOx 배출량 특성을 나타내었다.
김상현(Sang-Hyeun Kim),송시홍(Si-Hong Song),김혁제(Hyuk-Je Kim),김혁필(Hyeok-Pil Kim) 한국연소학회 2006 한국연소학회지 Vol.11 No.4
To meet the environmental requirements, Doosan Heavy Industries & Construction Co., Ltd. (Doosan) had developed low NOx pulverized coal burner and it was applied to boiler retrofit project, 130 ton/hr coal fired co-generation boiler, in 2003. NOx emissionand unburned carbon (UBC) in fly ash were measured during the commissioning tests. In this paper, the operation results of low NOx pulverized coal burner installed in 130 ton/hr coal fired boiler are presented. Burners emitted 160 ppm (@6 % O₂ basis) NOx and 3 % UBC with Chinacoal containing 0.86 % fuel nitrogen. And also it was shown that NOx emission rate of low NOx pulverized coal burner is linearly increased with fuel-nitrogen fraction of coal.
산업용 보일러에 적용된 저 NOx 미분탄버너의 연소성능 평가
김상현(Sang- Hyeun Kim),김혁제(Hyuk-Je Kim),김혁필(Hyeuk-Pill Kim),송시홍(Si-Hong Song),이익형(Ik-hyung Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Increasing environmental pressures to reduce NOx emission are being placed on coal-fired boilers. To meet the environmental requirements, Doosan Heavy Industries & Construction Co., Ltd.(Doosan) has developed low NOx pulverized coal burner. Low NOx pulverized coal burner has already delivered, and it’s combustion performance was evaluated to the NOx and Unburned Carbon(UBC) during the commissioning tests. The test results are shown that the strong relationship is existed between NOx and OFA flow rate, and also fuel-N fraction of coal has effected on NOx emission.
The Development of High Performance Flame Stability(HPFS) Tangential Coal-Fired Burner
김혁필(Hyeok-Pill Kim),김상현(Sang-Hyeun Kim),김혁제(Hyuk-Je Kim),송시홍(Si-Hong Song) 한국연소학회 2006 한국연소학회지 Vol.11 No.2
This report presents a study of the development of an advanced coal nozzle used in burners to reduce unburned carbon (UBC) in a tangential coal-fired boiler. To understand the mechanism of UBC reduction, experiments using conventional burners were carried out to evaluate the effects of air injection velocity, coal fineness and over fired air (OFA) on combustion efficiency. It was confirmed that ignition of pulverized coal particles close to the burner is helpful toward the complete bum of residual carbon in fly ash. These efforts indicated the additional results that UBC was strongly dependent on the primary air velocity and coal fineness; especially that UBC dramatically decreased when the weight fraction of pulverized coal under 75 ㎛ was over 85%. New coal nozzles, modified from conventional nozzles, were prepared and tested to improve the combustion efficiency. Some of these nozzles offered relatively lower unburned carbon than those of conventional burners and are referred to as HPFS (High Performance Flame Stability) coal nozzles.