高温储罐启动预热过程数值模拟研究  

Numerical Simulation on Start Preheating Process of High Temperature Storage Tank

作　　者：韩健 张小波 唐卉[1] Han Jian;Zhang Xiaobo;Tang Hui(Harbin Boiler Co.,Ltd.,Harbin 150046,Heilongjiang,China)

机构地区：[1]哈尔滨锅炉厂有限责任公司,哈尔滨150046

出　　处：《电站辅机》2020年第3期20-26,共7页Power Station Auxiliary Equipment

摘　　要：建立了高温储罐的三维数值模型,完成网格无关性验证和时间步长独立性检验后,数值模拟研究了预热过程中入口边界条件对预热时间、温度分布及预热效率等的影响。研究结果表明,当考虑密度变化时,由于浮力驱动,罐体内的空气会沿着高度方向产生温度场分层现象;在预热过程中,罐顶的升温速度最快,罐侧壁的温度分布不均情况最严重;随着预热温度的增加,预热到300℃所需的时间先减少后增加,当T in=500℃时所需预热时间最短;随着入口预热温度的增加,输入罐体的总热量在逐渐减少,预热效率在逐渐增加,有效放热量基本保持不变。A three dimensional model for a high temperature storage tank was established.Based on mesh independence and time-step independence check,the model is used to investigate the effect of entrance boundary condition on the preheat performance.The results show that when the density change was considered,the air in the tank will produce a temperature stratification along the direction of height due to the buoyancy driving.During the preheating process,the temperature rise at the top of the tank was the fastest and temperature distribution on the side wall of the tank was most uneven.The time required for preheating to 300℃decrease first and then increase with the increase of preheating temperature.The preheating time required for T in=500℃is the shortest.With the increase of inlet preheating temperature,the total energy of the tank was decrease,and the preheating efficiency was increases,and the effective heat release basically unchanged.

关 键 词：高温储罐 预热 数值模拟 

分 类 号：TK172[动力工程及工程热物理—热能工程]