耦合氢储能的火电机组在新型电力系统中的应用研究

氢储能作为新型电力系统的重要储能手段之一,对于促进新能源发电消纳,实现大容量、长时期储能,确保电网系统的安全稳定具有重要意义。国内氢储能技术还处于示范应用阶段,需探索出可推广的应用方案。基于火电机组参与电网调峰、新型电力系统以及电力现货市场交易等电力行业发展趋势,结合具体项目分析了火电企业耦合氢储能的必要性以及可行性,为新型电力系统下火电企业转型发展、效益提升、减碳运行提供了参考。     

Layered CuNi-Cu2O/NiAlOx nanocatalyst for rapid conversion of p-nitrophenol to p-aminophenol

In order to well arrange active sites and avoid byproducts, the reasonable structured carrier nanocatalyst plays a crucial role in high catalytic performance, but still remains a challenge. Herein, the layered CuNi-Cu₂O/NiAlO_x nanosheets have been constructed through hydrothermal synthesis followed by calcination and H₂ reduction treatment process. The in-situ formed CuNi nanoalloys (NAs) and nano-Cu₂O were evenly distributed on the bilateral surface of layered NiAlO_x nanosheets. Based on the planar structure of nanosheet, the synergy between catalytic active CuNi NAs and photocatalytic active nano-Cu₂O endows CuNi-Cu₂O/NiAlO_x nanosheets with rapid conversion efficiency for catalyzing p-nitrophenol (p-NP, 14 mg·L⁻¹) to p-aminophenol (p-AP) in 32 s with the reaction rate constant k up to 0.1779 s⁻¹, and no obvious performance decay can be observed even over 27 cycles. Moreover, high concentration of p-NP at 10 and 20 g·L⁻¹ could be reduced to p-AP within 14 and 20 min, respectively. Such designed nanoalloy/bimetal-oxide heterostructure can provide a solution for rapid conversion of aminoaromatics from nitroaromatics wastewater even at a large concentration range.

     

基于压电阻抗技术的木梁损伤识别研究

利用压电阻抗技术对粘贴有压电陶瓷(PZT)传感器的无损木梁和带孔洞损伤的木梁进行数值模拟和实验研究,并用损伤指数,即均方根偏差(RMSD)来定量评估木梁的阻抗值随损伤程度和损伤位置的变化关系。计算结果表明,利用压电阻抗法能够有效识别木梁的局部损伤,当PZT贴片和损伤位置的间距一定时,RMSD随损伤程度的增大而增大;当损伤程度一定时,RMSD随PZT贴片和损伤位置间距的增大而减小,数值结果与现有实验结果规律一致。相关结论证明了利用压电阻抗技术检测木梁局部损伤的有效性,可为工程实际提供参考。     

Significantly Stabilizing Hydrogen Evolution Reaction Induced by Nb-Doping Pt/Co(OH)2 Nanosheets

High stability and efficiency of electrocatalysts are crucial for hydrogen evolution reaction (HER) toward water splitting in an alkaline media. Herein, a novel nano-Pt/Nb-doped Co(OH)₂ (Pt/Nb Co(OH)₂) nanosheet is designed and synthesized using water-bath treatment and solvothermal reduction approaches. With nano-Pt uniformly anchored onto Nb Co(OH)₂ nanosheet, the synthesized Pt/Nb Co(OH)₂ shows outstanding electrocatalytic performances for alkaline HER, achieving a high stability for at least 33 h, a high mass activity of 0.65 mA µg⁻¹ Pt, and a good catalytic activity with a low overpotential of 112 mV at 10 mA cm⁻². Both experimental and theoretical results prove that Nb-doping significantly optimizes the hydrogen adsorption free energy to accelerate the Heyrovsky step for HER, and boosts the adsorption of H₂O, which further enhances the water activation. This study provides a new design methodology for the Nb-doped electrocatalysts in an alkaline HER field by facile and green way.     

莫来石结合碳化硅制品的研制

以微粉技术合成的莫来石为结合相,经低温烧成研制的碳化硅制品,具有优异的高温强度和导热性能,而且制品不氧化,使用寿命长。     

Mn2-xFexP0.51Si0.49化合物的比热容与相变

用差示扫描量热(DSC)法测定过渡金属化合物Mn2-xFexP0.51Si0.49(x=0.8,0.85,0.9,0.95,1.0)的比热容。结果表明,随着Fe含量的增加相变温度TC﹑相变热滞ΔThys增加。x=0.8,0.85,0.9,0.95,1.0对应的相变温度分别为280.1,311.2,316.5,323.6,347.0K,相变热滞分别为27.8,32.5,37.2,34,46.6K。由比热容确定了该系列化合物在相变点附近的最大熵变,其值分别为13.3,13.9,15.3,13.1,15.6J·(mol·K)-1。     

提高矿山充填质量试验研究

介绍了某铁矿山尾砂胶结充填的工艺特点和尾砂特性,进行了胶结充填材料的实验室强度试验和工业试验,并对尾砂胶结充填质量进行了评述。在此基础上,分析了影响胶结充填质量的因素,阐述了提高矿山充填质量的途径和措施,以指导该矿山生产实践。     

基于解耦双同步坐标变换的三相锁相环研究

提出了一种三相电压在三相电压不对称、频率突变、相位突变、注入谐波等不平衡情况下,准确锁定基波正序电压频率以及相位的方法。正(负)序同步坐标变换后,将产生二倍频交流分量,这个分量可以看作是由负(正)序电压分量导致的。通过提取负(正)序同步坐标变换下的直流分量,对正(负)序同步坐标变换下的二倍频交流分量进行补偿,构建了正负序解耦模块;同时,合理设计低通滤波器,滤除高次谐波分量,从而准确提取出了三相不平衡电压的正序基波分量。仿真结果表明,该方法能更快速准确的锁定基波正序电压的频率及相位。     

非圆活塞车削加工误差控制方法研究

提出了利用预测误差控制非圆活塞车削加工的后续加工精度的方法。所建立的误差预测模型既考虑了系统误差，又考虑了随机误差，能不断利用在线测量得到的新误差进行预测，时刻跟踪误差的变化，实现对误差的实时控制。典型零件的车削实验表明，该方法能有效地提高非圆活塞裙部的加工精度。     

CA机组风机故障预防

在CA机组正常运行过程中,利用HY106B测振仪监测加热炉主风机的运行状态。对其振动进行时域和频谱等分析,结合分析歪度、峭度、波形因子、脉冲因子等无量纲指标,以及观察轴承箱油位、测量轴承温度等方法,提前发现并及时处理问题,达到预防风机故障的目的。