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열적 제한요소를 고려한 열회수 증기발생기의 시동 특성 해석
김영일,김동섭,김재환,노승락,고상근,Kim, Young Il,Kim, Tong Seop,Kim, Jae Hwan,Ro, Sung Tack,Kauh, Sang Ken 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.11
A thorough understanding of the transient behavior during start-up is essential in the design and operation of the heat recovery steam generator(HRSG). During this period of time, material that is exposed to high temperature and experiences a large temperature variation is subject to high thermal stress. In this work, a transient formulation of the HRSG is constructed including the estimation of the thermal stress and fatigue of the drum wall. Start-up behavior of a single-pressure HRSG is analyzed and the effect of bypassing part of the gas turbine exhaust flow on the thermal stress evolution is examined. It is found that the modulation of the gas flow rate using a bypass damper is very useful in view of reducing the thermal stress of the drum and ensuring the fatigue lifetime.