QD10B-G2型1 000 kW燃气轮机发电车及其应用

北京电力公司,在全国电力系统中率先应用了当前最先进的燃气轮机发电技术,并设计定制了首台1 000 kW燃气轮机发电车.该型发电车的整体技术指标和性能、各项功能匹配、全部辅助设备等均达到了先进技术应用的完美结合,对今后电力系统的大功率发电车技术的应用和推广起到了很好的示范效果.文章介绍了首台1 000 kW燃气轮机发电车的结构特点,以及发电东的实际应用情况和技术发展方向.     

In Vivo Two-Photon Imaging Analysis of Dynamic Degradation of Hepatic Lipid Droplets in MS-275-Treated Mouse Liver

The accumulation of hepatic lipid droplets (LDs) is a hallmark of non-alcoholic fatty liver disease (NAFLD). Appropriate degradation of hepatic LDs and oxidation of complete free fatty acids (FFAs) are important for preventing the development of NAFLD. Histone deacetylase (HDAC) is involved in the impaired lipid metabolism seen in high-fat diet (HFD)-induced obese mice. Here, we evaluated the effect of MS-275, an inhibitor of HDAC1/3, on the degradation of hepatic LDs and FFA oxidation in HFD-induced NAFLD mice. To assess the dynamic degradation of hepatic LDs and FFA oxidation in fatty livers of MS-275-treated HFD C57BL/6J mice, an intravital two-photon imaging system was used and biochemical analysis was performed. The MS-275 improved hepatic metabolic alterations in HFD-induced fatty liver by increasing the dynamic degradation of hepatic LDs and the interaction between LDs and lysozyme in the fatty liver. Numerous peri-droplet mitochondria, lipolysis, and lipophagy were observed in the MS-275-treated mouse fatty liver. Biochemical analysis revealed that the lipolysis and autophagy pathways were activated in MS-275 treated mouse liver. In addition, MS-275 reduced the de novo lipogenesis, but increased the mitochondrial oxidation and the expression levels of oxidation-related genes, such as PPARa, MCAD, CPT1b, and FGF21. Taken together, these results suggest that MS-275 stimulates the degradation of hepatic LDs and mitochondrial free fatty acid oxidation, thus protecting against HFD-induced NAFLD.     

ZG275—485H可焊接铸钢的试验研究

针对实际生产中原ZG270-500铸钢件易出现裂纹的问题,选择GB7659-87《焊接结构用碳素钢铸件》中的ZG275-485H作为试验钢。对试验钢,除进行焊接性能检测试验外,在原化学成分基础上,重点对钢材冶炼中需控制的主要化学成分质量分数的范围进行了试验研究,最终得出生产用钢的主要化学成分质量分数为:C 0.20％～0.25％,Si 0.30％～0.50％,Mn 1.00％～1.20％,S、P和其它残余元素按原国家标准控制。2年多的试生产表明,试验钢能够满足企业生产需要,各项性能指标良好。     

钩尾销锻后热处理工艺分析

分析、比较了Q275钢钩尾销普通热处理工艺与锻热淬火＋回火工艺.由于该零件经普通淬火＋回火工艺后心部淬不透,力学性能差,能源消耗大.通过实践证明,采用锻热淬火＋回火工艺后力学性能明显提高,能源消耗显著减少.故提出对钩尾销采用锻热淬火＋回火的热处理工艺.     

山西阳光发电有限责任公司1号、2号机组CS275总线系统剖析

分析了西门子 TELEPERM- ME系统 CS2 75总线系统的结构和工作原理 ,并就该系统在山西阳光发电有限责任公司 1号、2号机组的应用情况进行分析评论。针对目前系统存在的问题或不足提出了部分解决方案     

Experimental analysis of the performance of the air supply system in a 120 kW polymer electrolyte membrane fuel cell system

For analyzing the performance of 120 kW polymer electrolyte membrane fuel cell (PEMFC) system and its air supply system, an air system test bench was built, then applied on a 120 kW PEMFC system test bench composed of air supply subsystem, hydrogen supply subsystem, stack, cooling subsystem and electronic control subsystem. The strategy composed of feedforward table and Piecewise proportional integral (PI) feedback control strategy is employed to regulate the flow rate and pressure of air supply system. Firstly, the air compressor map and the mapping relationship between the speed of air compressor, opening of back-pressure valve and stack current are obtained by carrying out experiments on the PEMFC air system bench. Then, the max output performance, steady-state performance, the startup performance, the dynamic response abilities of PEMFC system are tested, respectively. During the experiments, performances under different test conditions were analyzed by comparing parameters such as voltage inconsistency, average voltage, minimum voltage, voltage range, net power of the PEMFC system, and stack power. The test results show that the air supply system can provide qualified flow rate and pressure for the PEMFC stack. The peak power of the stack is 120 kW and net power of the system is 97 kW when the current is 538 A. The response time from rated net power to idle net power is 12 s and from idle net power to rated net power is 23 s. The overshoot of average voltage and minimum voltage in the process of increasing load is both 0.01 V, which are 0.015 V and 0.02 V lower than that when the load is decreased, respectively. The dynamic response speed and stability of the PEMFC system in the process of decreasing the load are better than those in the process of increasing the load.     

Experimental analysis of an ejector for anode recirculation in a 10 kW polymer electrolyte membrane fuel cell system

For analyzing ejector's performance in the system, an ejector for a 10 kW polymer electrolyte membrane fuel cell (PEMFC) system was first designed, manufactured, and a 10 kW PEMFC system bench was built up. A proportional valve and PI pressure feedback control method were adopted to control the hydrogen supply and anode inlet pressure. During the test, performances between dead-ended anode (DEA) mode and ejector mode were compared. Ejector's performances in the system, i.e., volume flow recirculated ratio, difference pressure, dynamic responses of primary pressure, anode inlet pressure, and recirculated gas flow rate during the purge process and current variation condition, were investigated. The results show that pressure adjustment is accurate, continuous, and fast using the proportional valve and PI pressure feedback control method. The hydrogen consumption rate in the ejector mode can reduce from 5% to 10% compared with the rate in the DEA mode except for the stack current 5 A and 10 A conditions. For better water removal out of the anode channel in ejector mode, the maximum stack power increases from 5.11 kW (DEA mode) to 9.56 kW (ejector mode). Anode pressure surge caused by the purge valve switching enhances the ejector's recirculated performance significantly.     

一种有源滤波器中电流传感器噪声抑制电路

有源电力滤波器实际运行过程中存在大量实际的噪音干扰,这些干扰严重影响滤波器的工作效果.给出对于有源电力滤波器电流采样回路的分析,分析在高频干扰下可能出现的干扰现象;分析源电力滤波器对于普通并网逆变器的不同点,提出采样回路中低通滤波器设计的重要性和特殊性.并针对这些分析提供了一套切实可行的降低电流采样回路干扰的解决方案,在实际应用中取得了明显的效果改善.     

煤田绳索取芯深孔钻探设备的选择与应用

探讨了煤田绳索取芯深孔钻探设备选用XY-6B立轴岩芯钻机、BW-320泥浆泵、GF-120 kW柴油发电机组及ZT-17A加强型四脚钻塔等,开展了深孔施工技术研究,指出煤田绳索取芯深孔钻探设备可降低钻探直接成本、能占领深孔钻探市场,对提高福建省121队的核心竞争力,保持绳索取芯钻进技术领先水平具有重要意义。     

TMP275在手持式实时测温仪中的应用

设计一种基于TMP275的手持实时测温仪,采用TI公司的低功耗单片机MSP430F149作为主控芯片,该系统采用I^2C总线协议数字温度传感器TMP275对现场温度进行采集,通过低功耗液晶模块进行实时温度显示,该系统具有采集数据准确、抗干扰能力强、功耗低的特点,非常适合于对现场环境温度进行测量与采集。