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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.
Three-dimensional experimental analyses were conducted in the pulverizer simplified isothermal cold flow model. The experimental model was constructed on a 1/3.5 scale of 500㎿ pulverized coal boiler. The purpose of this study is to investigate the characteristics of flows in the pulverizer with dynamic classifier for type A and B. The results showed that an increase of dynamic classifier rpm had no effect on total pressure loss, but an increase of inlet velocity was induced that the rise of total pressure loss in the pulverizer model with dynamic classifier. Inner flow pattern around the dynamic classifier showed that type B was more uniform than type A in pulverizer model.
Three-dimensional experimental analysis was conducted in the pulverizer simplified isothermal model.<br/> The experiment model was constructed on a 1/3.5 scale of 500MW pulverizer. The purpose of this study is to<br/> investigate the effect of design parameters on the pulverized coal separator efficiency. Where used pulverized<br/> coal separator design parameters are guide vane angle, static classifier angle, dynamic classifier rpm. Taguchi<br/> method was used to find the effective design parameters related to pulverized coal separator efficiency. The<br/> results of the experiment showed that guide vane angle and dynamic classifier rpm were the design key<br/> parameters. In addition to the total number of experiment cases were reduced by Taguchi method.
If the fineness of pulverized coal is increased in the coal-fired stations, unburned carbon in ash shall be reduced and combustion efficiency shall be improved. Especially, In connection with the environmental protection issue recently, the reduction of NOx is a secondary advantage. So, this study was conducted in the pilot scale pulverizer model and drop tube furnace that the used of static and dynamic classifier for the high performance effect of rotating pulverized coal separator. The results of the experiment showed that the amount of pulverized coal passing 200 mesh of the pulverizer with dynamic classifier was higher than that of the pulverizer with static classifier. Also unburned carbon in ash and NOx emission were reduced. Additionally, In case of the pulverizer with dynamic classifier, the power consumption and pressure loss were decreased than that of the pulverizer with static classifier based on the same fineness level.
In the commercial steam turbine, the exhaust hood guides the flow from the turbine to the condenser and transfers theleaving kinetic energy from the turbine to the potential energy. The steam turbine exhaust hood consists of a diffuser and a collector. The collector of the exhaust hood turns the flow direction from the turbine exit to the condenser about 90-deg, so its structure is asymmetric. Then distorted pressure profile is arisen by the nonaxisymmetric collector structure at the diffuser outlet. Thisasymmetric pressure-field propagates to the exit plane of theturbine through the diffuser. Thus the turbine may experience varying back pressure at different circumferential locations and distorted inflow condition for the exhaust hood is formed. For the complex geometry of the exhaust hood, unstructured mesh is used and the actuator disk model is adopted as a modeling of the whole turbine blade rows. Using the unstructured mesh and the actuator disk model, the interaction of the turbine and the exhaust hood is observed. To account for the effect of the distorted inflow condition, the result is compared with that of the exhaust hood calculation with the turbine exit condition as the inlet condition.