±660kV直流接地极线路与极址工程建设

介绍±660kV直流线路接地极线路与极址工程概况,从运行角度谈了一些运行维护及工程管理方面的想法。     

超临界660 MW机组系统优化分析

结合电厂设备实际安装状况,对超临界660 MW机组系统进行理论可行性和安全性分析。在烟风系统、启动系统、汽水系统、疏水系统等方面进行优化设计。优化调整后,试运行结果表明,机组各项指标均达到了良好要求,此次优化达到了提高机组运行经济性和稳定性的目的。     

Development of a Lyophilized Parenteral Pharmaceutical Formulation of the Investigational Polypeptide Marine Anticancer Agent Kahalalide F

Kahalalide F is a novel antitumor agent isolated from the marine mollusk Elysia rufescens; it has shown highly selective in vitro activity against androgen-independent prostate tumors. The purpose of this study was to develop a stable parenteral formulation of kahalalide F to be used in early clinical trials. Solubility and stability of kahalalide F were studied as a function of polysorbate 80 (0.1%–0.5% w/v) and citric acid monohydrate (5–15 mM) concentrations using an experimental design approach. Stabilities of kahalalide F lyophilized products containing crystalline (mannitol) or amorphous (sucrose) bulking agents were studied at +5°C and +30°C ±60% relative humidity (RH) in the dark. Lyophilized products were characterized by infrared (IR) spectroscopy and differential scanning calorimetry (DSC). Recovery studies after reconstitution of kahalalide F lyophilized product and further dilution in infusion fluid were carried out to select an optimal reconstitution vehicle. It was found that a combination of polysorbate 80 and citric acid monohydrate is necessary to solubilize kahalalide F. Lyophilized products were considerably less stable with increasing polysorbate 80 and citric acid monohydrate concentrations, with polysorbate 80 being the major effector. A combination of 0.1% w/v polysorbate 80 and 5 mM citric acid monohydrate was selected for further investigation. Lyophilized products containing sucrose as a bulking agent were more stable compared to the products containing mannitol. The glass transition temperature of the sucrose-based product was determined to be + 46°C. The amorphous state of the product was confirmed by IR analysis. A solution composed of Cremophor EL, ethanol, and water for injection (5%/5%/90% v/v/v CEW) kept kahalalide F in solution after reconstitution and further dilution with 0.9% w/v sodium chloride (normal saline) to 1.5 μg/m. A stable lyophilized formulation was presented containing 100 μg of kahalalide F, 100 mg sucrose, 2.1 mg citric acid monohydrate, and 2 mg polysorbate 80 to be reconstituted with a vehicle composed of 5%/5%/90% v/v/v CEW and to be diluted further using normal saline.     

Φ660旋流器结构参数优化实践

泗选厂Φ3.2×3.1m球磨机在将螺旋分级改为旋流器分级后,因国内无参考配置,初期未找到合适参数,致使分级效果差,影响浮选指标。本文着重介绍该厂对该旋流器结构参数进行的一系列优化配置实践,并最终找到了较佳配置,提高了分级效果。     

660MW空冷机组取消脱硫旁路运行方案分析与实施

介绍河北国华定洲发电有限责任公司660MW空冷机组引风机、增压风机串联布置,取消旁路挡板的运行方案,分析取消脱硫旁路后基建调试、系统运行、控制逻辑方面存在的问题,及相应的处理措施,通过运行实践表明,该方案的实施能防止原烟气泄漏,保证脱硫效率.     

基于EL模型的三电平电压型PWM整流器的无源与PI相结合控制方法研究

为了提高三电平电压型PWM整流器的性能,论文提出了基于EL模型的无源控制与PI控制相结合的控制方法。根据三相四线三电平整流器主电路拓扑结构,建立了dq坐标系下的EL模型。基于EL模型,采用注入耗散矩阵的方法,并与PI控制方法相结合,设计了无源控制器。该方法使整流器具有较低的谐波失真、单位功率因数等优点。仿真结果验证了基...     

利用电致发光线的光学电压有效值传感器

利用电致发光(EL)线设计并实验研究了一种光学电压有效值传感器。所用EL线的主要材料为ZnS:Cu,在一定幅值的工频电压作用下,可产生中心波长约为525nm的可见光;将此EL用塑料光纤(POF)传输到光电探测器(PD),则PD的开路电压与被测电压有效值之间具有近似线性关系。对100～500V工频电压有效值进行了实验测量,其电压测量灵敏度约为10.8μV/V,非线性误差低于1.8%。实验测量了所用EL线的电致发光光谱、输入阻抗以及EL的温度特性。与以往基于Pockels电光效应的光学电压传感器不同的是,本文提出的电压传感器不需要工作光源,并具有结构简单、成本低等优点。     

硅微粉在摩托车外胎帘布胶中的应用

研究了硅微粉部分替代N660炭黑在摩托车外胎帘布胶中的应用,对帘布胶的性能进行了测试。结果表明,适量的硅微粉替代部分N660炭黑会降低胶料的门尼粘度,使胶料表面光滑,改善了胶料的压延工艺性能。对硫化胶的物理性能和成品的粘合性能等无不良影响,降低了成品轮胎生产成本。     

某660 MW 超临界直接空冷机组抽真空的问题分析及处理

某电厂扩建工程660 MW超临界直接空冷机组在首次冷 态启动前的真空拉升过程中出现了预抽真空时间过长,汽机 旁路打开后真空急剧下降但凝结水回水温度无变化等现象, 对其产生原因进行了分析,并提出了处理措施,为其他试运机 组出现同类现象提供借鉴和参考。     

新型红色有机电致发光材料

红色发光材料一直是有机电致发光中为烯缺的材料,也是电致发光全色显示不可缺少的材料。通过设计和合成得到了一种新型红色电发光材料,（2,3’－二羟基偶氮苯）－（8－羟基喹啉）合铝（Ⅲ）（Al（azb-q））,该材料为一种铝的金属络合物,含有两种配体：8－羟基喹啉和2,2’－二羟基偶氮苯。实验证明,该材料具有较高的热稳定性较好的成膜特性,同时材料本身具有一定的电了传输能力。电致发光器件证实了该材料的红色发光特性和良好色度学性质。