摘要
合理的斜温层储罐内部自然分层过程控制手段有利于降低储罐内部件:盖层的厚度,从而可间接提升储罐热电解耦能力.基于计算流体力学(CFD)对采用了一种新型布水器的斜温层储热罐(直径30 m)内部在不同入口流速下的流动及传热特性进行了数值研究.基于k-ε湍流模型研究了储罐储热过程中斜温层的形成和增长,获得了斜温层在形成过程和生长过程中的厚度变化规律,并研究了入口流速对温度分层过程和斜温层厚度的影响.结果表明,在储热过程中,斜温层形成后其厚度先减小随后基本不变.在相同的布水器尺寸和罐体结构下,斜温层的形成这率随入口流速的增加而增大,斜温层形成后的厚度随入口流速的增加先减小后增大.研究结果可为同类型斜温层储罐的操作提供指导,并为设计中控制斜温层厚度提供参考.
The ability of stratified thermocline water storage tank in power plant units to decouple heat and power partly depends on the thickness of thermocline,which is closely linked with the proper control method of the stratification process.Flow and heat transfer characteristics with different inlet velocities in a stratified thermocline water storage tank of 30 meters in diameter with a new type of diffuser were investigated numerically based on the computational fluid dynamics(CFD).The IèE turbulence model was used to describe the motion and growth of thermocline during charging process.Variation rule of thermocline thickness during generating and growth was obtained,and the effect of inlet velocity on stratification and thermocline thickness was investigated.The results show that the thermocline thickness is almost constant after the generation of stratified thermocline during the discharging process.In addition,the generation rate of thermocline increases with the increasing of the inlet velocity for the same diffuser size and tank structure.while the thickness decreases at first and then increases with increasing inlet velocity.The results from this work may be of interest to operators attempting to obtain more information in analogous stratified thermocline water storage tanks and provide the designers of water storage tanks with references about methods of decreasing the thickness of thermocline.
作者
姜晓霞
姚亮
JIANG Xiao-xia;YAO Liang(Harbin Turbine CO.,LTD.,Harbin 150046,Heilongjiang,China)
出处
《电站辅机》
2019年第4期9-13,共5页
Power Station Auxiliary Equipment
关键词
斜温层储热罐
热电解耦
储能
入口流速
数值研究
stratified thermocline water storage tank
heat-power decoupling
energy storage
inlet velocity
numerical study
