Transient analysis of steam generator in PWR nuclear power plant

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汽吞吐采油技术研究与试验

本文通过室内物模实验和数值模拟研究,论证了蒸汽吞吐采油技术在低渗透油藏的可行性,对油层组合和注汽参数进行了优化设计,研究了注汽过程中的隔热和防止粘土膨胀配套技术。在此基础上,首次在低渗透油田二类区块2口井进行了两个周期的蒸汽吞吐采油现场试验,取得了较好增油效果,单井产液量和产油量增加,改善了油层动用状况,降低了原油粘度,提高了原油流动性。     

陆水电厂水轮机叶片裂纹原因分析与处理

对陆水电厂水轮机叶片裂纹产生的原因进行了分析,并提出相应的处理方法,实施后取得了良好的效果.     

一种新型板式换热器在轻工行业的应用

介绍了一种能利用低压二次蒸汽的新型板式换热器在味精厂的应用。该板式换热器以味精厂结晶罐的二次蒸汽作加热介质,冷水被加热后作锅炉入炉水之用。一方面充分利用了二次蒸汽的冷凝潜热,节省了加热入炉水的热能（节省了燃煤）,同时又减少了二次蒸汽直接用水冷凝后排放对环境产生的热污染,节能减排效果十分显著。     

脉动真空压力蒸汽灭菌器灭菌效果的质量控制

目的：总结脉动真空压力蒸汽灭菌器的各监测环节,保证灭菌物品的质量.方法：利用现代化的监测设备和科学规范的监测方法,对脉动真空压力蒸汽灭菌器的灭菌效果实施全方位的有效监测.结果：效果良好的灭菌监测是保证灭菌物品质量唯一途径,生物监测是灭菌效果评价的“金标准”.     

用现代液压技术推动水轮机调节装置的升级换代

概括了现代液压技术的基本特点及其在水轮机调节装置中的应用状况；介绍了应用该技术研制的GYT系列高油压调速器的进展及其特点；总结了研制中形成的若干技术观点；提出了用该技术开发、推广新一代高油压水轮机调节装置的任务。     

Modeling the kinetics of methane conversion in steam reforming process of coke-oven gas based on experimental data

Steam-reforming is an effective approach for upgrading methane and hydrocarbon of coke-oven gas into CO and H2, but the kinetic behavior needs more study. We investigated the conversion of methane in coke-oven gas by steam reforming process in an electric tubular flow at 14 kPa with temperature varying from 500 °C to 950 °C, and developed a kenetic model for , ignoring the effects of adsorption and diffusion. The optimal dynamic conditions for methane conversion 14 kPa are as follows:the ratio of the amount of water to the amount of methane is from 1.1 to 1.3;the reaction temperature is from 1 223 K to 1 273 K. The methane conversion rate is larger than 95% when the ratio of the amount of water to the amount of methane is 1.2 at a temperature above 1 223 K with the residence time up to 0.75 s.     

Numerical investigation on the flow and power of small-sized multi-bladed straight Darrieus wind turbine

Straight Darrieus wind turbine has attractive characteristics such as the ability to accept wind from random direction and easy installation and maintenance. But its aerodynamic performance is very complicated,especially for the existence of dynamic stall. How to get better aerodynamic performance arouses lots of interests in the design procedure of a straight Darrieus wind turbine. In this paper,mainly the effects of number of blades and tip speed ratio are discussed. Based on the numerical investigation,an assumed asymmetric straight Darrieus wind turbine is proposed to improve the averaged power coefficient. As to the numerical method,the flow around the turbine is simulated by solving the 2D unsteady Navier-Stokes equation combined with continuous equation. The time marching method on a body-fitted coordinate system based on MAC (Marker-and-Cell) method is used. O-type grid is generated for the whole calculation domain. The characteristics of tangential and normal force are discussed related with dynamic stall of the blade. Averaged power coefficient per period of rotating is calculated to evaluate the eligibility of the turbine.     

管束干燥机蒸汽泄漏的故障机理及其解决方案

管束内件在管束干燥机的工作过程中起到了关键性的作用。一方面它使物科产生流动；另一方面，蒸汽从它内部通过。使物科在流动过程中被逐步烘干。因而，它不但是烘干物科的主体，还是传递运动或动力的主体。由于故障就出在它身上，所以，对管束内件的受力分析及对其内部主要结构的剖析，就是我们从根本上解决蒸汽泄漏的焦点和关键所在。     

相变潜热随温度的变化及其对物质的蒸气压方程的影响

当物质发生一级相变时，相变潜热是温度的函数．考虑与凝聚相达到平衡的饱和蒸气，当相变潜热随温度发生变化时，求得物质的蒸气压方程．