CAJ | 학술논문

分析了660 MW超超临界CFB锅炉的设计原则和依据，提出了简约型660 MW超超临界CFB锅炉方案。采用单布风，消除翻床现象；不设置外置式换热器，能够满足性能要求。前水冷壁采用锯齿形结构，在截面积不变的条件下扩大周界长度，确保一次上升水冷壁的面积，炉膛高度仅为48.2 m；二次风在齿凹处给入，降低了二次风处炉膛实际深度，利于改善炉膛中心区的供氧。后墙水冷壁在两个分离器之间设置一个锯齿，将炉膛大体上分为4个单元，形成单元设计。根据目前的运行实践，随着分离器直径的增加，飞灰的中位径基本上没有上升趋势，说明分离器直径放大并不能引起分离效率的显著下降，因此布置4个直径为10.85 m的分离器是完全可行的。介绍了简约型660 MW超超临界循环流化床锅炉结构，并对其性能进行了预测。
분석료660 MW초초림계CFB과로적설계원칙화의거，제출료간약형660 MW초초림계CFB과로방안。채용단포풍，소제번상현상；불설치외치식환열기，능구만족성능요구。전수랭벽채용거치형결구，재절면적불변적조건하확대주계장도，학보일차상승수랭벽적면적，로당고도부위48.2 m；이차풍재치요처급입，강저료이차풍처로당실제심도，리우개선로당중심구적공양。후장수랭벽재량개분리기지간설치일개거치，장로당대체상분위4개단원，형성단원설계。근거목전적운행실천，수착분리기직경적증가，비회적중위경기본상몰유상승추세，설명분리기직경방대병불능인기분리효솔적현저하강，인차포치4개직경위10.85 m적분리기시완전가행적。개소료간약형660 MW초초림계순배류화상과로결구，병대기성능진행료예측。
The design consideration of a 660 MW ultra-supercritical circulating fluidized bed (CFB) boiler was discussed. The conceptual design of simplified 660 MW ultra-supercritical CFB boiler was suggested. In this boiler, there is only one distributor to avoid the bed inventory overturn between pant-legs. All the heating surface in the loop are located in the uppers of the furnace instead of external heat exchanger. The front water wall is embattlement shape, the water wall surface is enlarged compared with that the normal one because the length of the wall is expended for the same furnace sectional area. And the height of the furnace is only 48.2 m. The secondary air nozzles are located in the trough to the furnace of the embattlement shape wall, the distance between the front wall and rear wall is decreased to improve the Oxygen diffusion in the gas solid two phase flow. There is an embattlement in the rear wall between the adjacent cyclones. And the furnace alone the width direction is divided into four units. Thus this design is unit design. The operation practices shows that the cut size of the fly ash is not upward trend when the cyclone diameter increases. This indicates that the collection efficiency of the cyclone does not decrease when the cyclone diameter increases, which proves the feasibility of the cyclone with 10.85 m diameter in this design. The structure of the simplified 660 MW supercritical CFB boiler was described, and the performance was also predicted.