CAJ | 학술논문

塔式太阳能热发电站定日镜场通常采用多点聚焦策略来降低吸热器表面辐射能流的不均匀性,防止发生过热故障.文中以塔式电站柱式吸热器单根吸热管为研究对象,采用具有多个极大值的高斯函数来描述多点聚焦时吸热管表面具有多个能流集中点的辐射能流分布,数值模拟分析吸热管的热参数特性.结果显示:聚焦点个数一定时,存在最优的聚焦点位置,使得吸热管表面辐射能流不均匀性最低.同时随着聚焦点个数增加,吸热管表面辐射能流更加均匀,最大壁温减小,而轴向最大绝对温度梯度增大.因此对于多点聚焦,应综合考虑吸热管的热参数,选择最优化的聚焦点个数和聚焦点位置.
탑식태양능열발전참정일경장통상채용다점취초책략래강저흡열기표면복사능류적불균균성,방지발생과열고장.문중이탑식전참주식흡열기단근흡열관위연구대상,채용구유다개겁대치적고사함수래묘술다점취초시흡열관표면구유다개능류집중점적복사능류분포,수치모의분석흡열관적열삼수특성.결과현시:취초점개수일정시,존재최우적취초점위치,사득흡열관표면복사능류불균균성최저.동시수착취초점개수증가,흡열관표면복사능류경가균균,최대벽온감소,이축향최대절대온도제도증대.인차대우다점취초,응종합고필흡열관적열삼수,선택최우화적취초점개수화취초점위치.
Generally, the heliostat field in the solar thermal power tower plant used the multi-aiming point strategy to reduce the non-uniformity of radiation heat flux on the receiver to prevent the overheating. In this paper, a single tube used in solar thermal power tower cylinder receiver was studied theoretically. The heat flux on the tube using the multi-aiming point strategy with multiple concentrated points was achieved by the Gaussian function with multiple maximum values. The thermal parameters characteristic were analyzed by numerical simulation. The results show that each aiming point has the optimal position making the lowest non-uniformity of the radiation heat flux on the tube when the number of the aiming point is constant. What's more, the radiation heat flux on the tube is more and more uniform and the maximum wall temperature decreases with the number on the aiming point increasing, while the maximum absolute temperature gradient increases. As a consequence, the thermal parameters must be considered comprehensively according to the multi-aiming point strategy to choose the optimal number of the aiming point and their optimal positions.