复混肥干燥窑尾气的处理

采用塑料填料塔代替布袋除尘器和钢制喷淋塔,对复混肥干燥尾气进行除尘和脱硫,计算确定喷淋水量、塔径和填料装填量及运行阻力。为减少阻力,适应尾气压力较低的状况,采取将填料串联在尼龙绳上,再悬挂安装在支承条上。技改投入15万元,尾气达标排放(SO2质量浓度36 m g/m3,粉尘质量浓度12 m g/m3)。     

铝箔轧机中生成热分配的实验及分析

系统分析了铝箔轧机轧制过程中热量转移及热量平衡的过程,提出了一种热量转移的观点。实际测量了三种不同喷嘴开放状态下分段冷却的轧件表面温度,采用理论分析与实验相结合的方法,求出了对应工况下轧件和工作辊所吸收热量的热功率,得到了生成热在轧件与轧辊间的分配系数,轧件分配系数大致为0.11~0.33,轧辊分配系数为0.67~0.89。随冷却能力的增强,轧辊分配系数增大,轧件分配系数减少。

     

两种典型山地地形的输电塔受力分析

目的 受典型微地形影响,架空输电线路遭受的风速会增大,因此需要研究微地形对输电塔受力的影响。 方法 比较了中国规范、美国规范和澳洲规范的山峰和山坡两种典型山地地形的地形系数,对地形系数进行了参数计算,分析了地形系数的分布规律。计算了不同规范、不同路径方向和不同位置的输电塔塔身主材内力。 结果 结果表明：中美澳规范的地形系数的分布规律基本一致,受坡度、水平距离和竖向高度影响的程度有差异;线路沿山顶走线时,塔身主材受力最大;地形系数比风速增大10%对铁塔受力影响更大。 结论 建议输电线路尽量垂直跨越山顶,两种典型山地地形处的输电塔需考虑地形系数的影响。     

三峡左岸电站发电机定子纯水冷却系统分析及改进

针对三峡左岸电站发电机定子纯水冷却系统存在的电磁泵频繁烧损和内部控制流程设计缺陷等问题,进行了大量的研究和试验,实施了采用软启动方式、改造膨胀水箱、修改纯水系统控制逻辑等一系列改进措施,有一定的工程有效性。     

Study on Microstructure and Mechanical Properties of Hot Rolled Low Silicon Containing Phosphorus TRIP Steel

The effects of final air cooling temperature on the microstructure and mechanical properties of hot rolled 0.2C-1.9Mn-0.5Si-0.08P TRIP steel were studied by utilizing OM, SEM, TEM and tensile tests. Experimental results showed that in the multiphase microstructure of the investigated steel when the finish rolling temperature was about 820 ℃ and the final air cooling temperature was in the range of 630-700 ℃, the grain size of most of ferrite was finer (about 4 μm) and which had higher dislocation density, t...     

Internal surface protection of gas turbine blade by Si‐aluminide coating

A laboratory‐scale slurry silicoaluminizing process has been developed to apply coating into cooling passageways of a first‐stage gas turbine blade. Analytical techniques for characterizing the coatings comprised optical microscopy, SEM, EDS, and XRD. The results of metallographic examinations demonstrated that acceptable coatings had been formed in almost all of the passageways. The amounts of Al and Si in the topcoat were found to be in the ranges of 24–26 wt% and 4.5–6 wt%, respectively. The heat treated coating consisted largely of β‐NiAl phase as the coating matrix with uniform distribution of <2 µm‐size precipitates. In addition, oxidation and hot corrosion performance of the coatings were investigated by cyclic exposure to 1100 °C and the furnace method using a mixture of sodium sulfate‐40 wt% sodium vanadate‐10 wt% sodium chloride at 780 °C, respectively. It was found that the presence of Si in the coating improves both oxidation and hot corrosion Type II properties.     

Analysis of the energy performance of a ground source heat pump system after five years of operation

GeoCool plant was the result of a EU project whose main purpose was to adapt ground coupled heat pump technology to cooling dominated areas. The execution of this experimental plant was completed at the end of year 2004, starting on February 2005 the regular operation of the air conditioning system. Since then, GeoCool facility has been monitored by a network of sensors characterizing its most relevant parameters. Several aspects of the performance and behaviour of the system during its first operational year were presented on a previous paper. This paper presents the energy performance measurements of GeoCool ground coupled heat pump system acquired during five years of operation as well as the evolution of the return water temperature from the ground as a representative of the ground temperature. The analysis of the experimental results shows that the system energy performance is maintained through the years with no appreciable impact on ground thermal response.     

蒸发冷却技术在大功率模块冷却中的应用

以特殊场合电力电子变流装置中器件的冷却为出发点,详细论述了蒸发冷却技术在一套800kVA变流装置中的应用,给出了其运行原理、实现方法和试验数据。现场调试运行结果表明,该套装置具有体积小、安全可靠、冷却效率高等特点。同时,由于去掉了风机,降低了噪声,而且基于蒸发冷却本身的特点,使得该套装置中的器件(IGBT)壁面温度不受外界环境的影响,保持在45℃左右(可通过改变腔体内部的压力来调节)。整个装置运行取得了较好的冷却效果,满足了特殊场合的需要,从而为大功率器件的冷却提供了一种有效的实现方法,具有较好的应用和推广价值。     

大型空冷汽轮发电机冷却技术的现状与分析

本文分析了空冷技术当前受到重视的原因.通过对国内外空冷汽轮发电机发展状况的分析,指出了国内进一步研究空冷技术的必要性.通过对空冷汽轮发电机冷却原理的介绍,对空冷技术改进的可行性进行了分析.     

大型塔器研制

针对"801"工程一、二级冷、热塔的研制,分别从设备技术特性、结构特点和制造工艺等方面进行总结,重点介绍其关键制造工艺技术.