藏东高原浅丘红层区泥石流发育特征及活动性研究

藏东贡觉县高原浅丘红层区降雨条件有限,泥石流发生、发展主要受控于物源条件及沟道条件,属“物源控制型”泥石流。通过地质调查及统计分析的方法,详细分析了泥石流形成条件、形成机制及活动特征,得出了以下结论:流域面积<1.0 km2、沟道纵比降100‰~300‰的沟道容易发生泥石流;受构造、冻融风化及含石膏岩的影响,泥石流物源相对丰富,物源类型以坡面侵蚀为主,具有“点多面广”的分布特征,补给形式表现为“零存整取”的特征;受控于物源补给形式,泥石流形成主要包括:坡面冲刷起动→沟床汇聚堆积→揭底侵蚀3个阶段;受物质来源的影响,区内泥石流流体性质以粘性-过渡型为主,泥石流具有多期次、中低频率、单次泥石流规模较小的活动特征。

一种新型污泥处理资源化利用技术研究

提供了一种新型污泥安全有效资源化利用处理技术。实验结果表明,短程硝化24 h时,污泥中6种重金属的浸出率均达到95%以上。通过固定化包埋碱性木质素小球吸附回收浸出液中重金属,重金属Pb、Zn、Cd、Cu、Mn和Cr的去除率分别为99.03%、95.57%、96.65%、97.57%、95.82%和95.13%。硝化处理后的污泥与黄土壤按照1∶2(E1)、1∶1(E2)和2∶1(E3)比例混合后种植菠菜和小麦,植株内重金属含量均未超过GB2762—2012《食品中污染物限量》上限值。本技术去除污泥中的重金属效果极为显著,经济环保,具有较高的应用价值。

基于省间省内两级电力现货市场的外送交易策略研究

全国统一电力市场是符合我国能源转型的重要机制保障。作为全国统一电力市场的第一阶段,省间省内现货“两级申报、两级出清”模式无疑提升了市场参与难度。省级电网作为中间代理方,如何平衡省间省内利益成为重要的研究课题。站在送端省份的角度,提出以两级市场交易协调平衡为目标的决策思路,构建基于两级现货市场的外送交易优化决策模型,为量化省间现货对省内现货的影响提供方法,为送端省份在两级现货市场环境下的交易决策提供支撑。

Instrument for insulation conditions detection of roof insulator on high-speed-train

With the rapid development of high-speed-railway,environment around high voltage device on train roof becomes very complicated. Most train accidents happened due to occurrence of flashover on roof insulator,but the insulation condition estimation of insulator in such environment is much difficult. To ensure the insulation property of electric equipment,and guarantee the operation safety of high-speed-train,here established an instrument with high reliability which can on-line monitor insulation condition of roof insulator and give out advanced alarm before the incipient insulator flashover. The instrument consists of three parts,Data Acquisition & Sensor,Data Processing and Back Processing. Anti-interference and protection methods are processed to Rogowski coil sensor for better leakage current signal. To avoid the fluctuation from railway power supply,four modules are set to filter the power supply waveform. Through laboratory measurement,it is shown that the leakage current and the impedance angle can be detected by the instrument accurately. From the comparison of leakage current and impedance angle results under different moisture condition and the alarm operation when leakage current value reached threshold,this instrument can give out enough information for staff to understand the insulation condition of insulator.

某集中式动力单元电抗器温升过高的问题分析与解决对策

针对温升试验时牵引电抗器温升超标问题,通过现场排查、分析推断电抗器受风面积太小是导致其温升过高的主要原因。首先基于热损耗理论,计算器件的功率损耗;然后构建牵引系统增加导风罩前后的有限元模型,并运用ICEPAK对系统进行热仿真分析,以验证增加导风罩后的散热效果;最后加工导风罩用于样机的温升试验。结果表明:仿真温度与试验温度的误差在10%左右,证明了数值模拟的准确性;增加导风罩后,系统温升可降低40K左右,验证了增加导风罩方案的可行性。