双配合面无螺栓挡板结构设计技术研究

针对无螺栓挡板结构在先进航空发动机中的应用,本文考虑温度场、转速以及初始安装尺寸等因素的影响,展开双配合面无螺栓挡板结构设计技术的研究。通过分析挡板结构两个径向定位面处应力与变形的关系,得到挡板与涡轮盘的径向变形协调规律;根据径向变形协调关系,为挡板结构设计时,配合公差的选取提供科学依据;根据研究提出双配合面无螺栓挡板结构设计应遵循的一般原则,为双配合面无螺栓挡板结构的设计和工程应用提供科学的参考。     

论FGD系统取消旁路挡板后逻辑优化处理

FGD系统,即烟气脱硫系统,目前大部分火力发电厂燃煤机组所配备的脱硫装置,其通过安装在烟道上的原烟气挡板门(脱硫装置进口挡板门)、净烟气挡板门(脱硫装置出口挡板门)、旁路挡板门(脱硫装置旁路挡板门),实现了在不影响主机情况下的投运与退出功能。然而,随着国家对环保要求的日益严格,绝对不允许主机在未投运脱硫装置情况下发电,尤其对脱硫装置旁路挡板的开关、漏风等情形把关越来越严,脱硫装置的旁路挡板已形同鸡肋。以华能汕头电厂#1机组FGD系统取消旁路挡板的工程为实例,阐述了脱硫装置在取消了旁路挡板后如何达到与机组同步启停,以及日常运行中如何做到与机组的稳步协调工作。     

Numerical and experimental study of a shell and tube heat exchanger for different baffles

In the present work, the shell and tube heat exchanger (STHX) is designed based on The Tubular Exchanger Manufacturers Association standards with hot fluid (water) flowing on the shell side and cold fluid on the tube side. A comparison is made between the Nusselt number and friction factor obtained from numerical and experimental results of segmental baffles (SBs) and helical baffles (HB) with different baffle inclinations. The results show that SB provided a higher Colburn factor (j_s) when compared with HBs STHXs (20°, 30°, 40°, and 50°), but shell side pressure drop is lower for 40° HBs STHXs for the same shell side fluid flow rates.     

高效双通道型Trombe墙冬季热性能分析

针对传统Trombe墙冬季供热效率不高、夏季过热等问题,提出一种高效双通道型Trombe墙系统,对该系统在冬季时的热性能和采暖效果进行实验研究。结果表明,高效双通道型Trombe墙热效率是传统Trombe墙的1.6~3.4倍,室内温度相比于传统Trombe墙可升高0.7~5.7 ℃。其中,当总通道厚度为0.5 m,外通道为0.2 m,隔热板形状为凹凸板时热效率最高为31%,此时室内温度可达21.7 ℃。此外,在实验研究基础上建立高效双通道型Trombe墙的传热模型,并验证其准确性。     

桂花水电站掺气分流墩与消力池联合应用消能效果的研究

通过试验研究了桂花水电站拱坝掺气分流墩的体型、布置和水流流态,消力池和消力池中T型墩的体型和布置,掺气分流墩和消力池联合应用的水流流态和消能效果。试验表明,掺气分流墩与消力池联合应用明显改变了水流流态,具有显著的消能效果。     

Second‐Law Based Thermodynamic Analysis of a Novel Heat Exchanger

In the present investigation, second‐law based thermodynamics analysis was applied to a new heat exchanger with helical baffles. The helical baffles are designed as quadrant ellipses and each baffle occupies one quadrant of the cross‐section of the shell side. Experimental tests were carried out with cold water in the tube side with a constant flow rate, and hot oil on the shell side with flow rate range from 4–24 m³/h. The temperatures and pressures for the inlet and outlet of both sides were measured. The heat transfer, pressure drop, entropy generation, and exergy loss of the new heat exchanger were investigated and compared with the results for a conventional shell‐and‐tube heat exchanger with segmental baffles. The computed results indicated that both the entropy generation number and exergy losses of the new heat exchanger design are lower than those of the heat exchanger with segmental baffles, which means that the novel heat exchanger has a higher efficiency than the heat exchanger with segmental baffles, from the second‐law based thermodynamics viewpoint.     

压水堆围板对堆芯物理特性的影响

应用少群中子扩散方程有限元差分计算方法，对具有围板结构的压水堆堆进行了细网的扩散计算。研究了围板厚度，材料对堆芯功率分布和有效增殖因子ｋｅｆｆ的影响。     

660MW机组脱硫系统对机组主体运行影响的试验研究

介绍了目前国内已投运的单机容量最大的发电机组配套的脱硫装置，在旁路挡板半关、完全关闭和快开以及增压风机跳闸情况下对机组主体运行的影响，对同类机组的安全运行有一定的参考价值。     

尼龙－6聚合反应器内部结构的冷模研究

本文研究ＶＫ管、尼龙６聚合反应器内挡板结构对高粘流体混合质量的评价问题。通过测定ＲＴＤ、空间混合相关系数以及对混合流场的直接观察，对多孔板型、换向器型以及抛物线型３种内插件的混合效果作出了定量和直观的综合评价，并能估计出混合效果的方向性。同时还报导了利用Ｎ．Ｓ．方程求流动数值解的某些结果，理论计算和实验所得结论相符。     

炉膛水冷壁高温腐蚀原因分析及治理对策

湖北汉川电厂1－3号机组燃烧区域水冷壁管普遍发生高温腐蚀。1－2号炉由于运行时间较长，表现的更为严重，1号炉由于高温腐蚀而泄漏的管壁厚度仅为1mm左右，严重影响机组的经济、安全与稳定运行。经多方面考察与研究，在分析高温腐蚀的机理上，制定出相应的治理对策，为今后的维护、维修、调试及运行作参考。