裂解炉炉管基于风险的检验

管式裂解炉炉管受炉内高温及管内介质压力的共同作用,易发生蠕变等现象,因此,对裂解炉炉管进行风险评价尤为重要。应用API 581基于风险的检验规范对炉管的失效可能性及失效后果分别进行定量计算,并由此得到裂解炉炉管的定量风险结果和基于风险的检验周期,为裂解炉的风险控制与管理提供依据。     

电石法PVC含汞废水处理装置运行总结

介绍了湖北宜化化工股份有限公司采用"化学沉淀+离子交换"法对电石法PVC含汞废水处理的工艺流程,并对含汞废水处理装置调试过程中出现的问题进行了优化改进。处理后出水含汞质量浓度小于0.002 mg/L,废水全部回用,水处理成本35.2元/m~3。     

射流流化床内流体力学行为的模拟研究

以流化床应用为代表的气固流动系统是许多化工过程中的重要组成部分 ,CFD( computational fluid dynamics)方法能够为其优化设计和放大提供所需要的信息 .本文采用双欧拉模型 ,与 Gidaspow等的实验结果进行了对比 ,模拟了二维射流流化床内气泡的形成规律 ,得到了带锥型分布器的流化床内瞬时空隙率和气固相速度分布等流体力学参数 .对锥型分布器流化床的实验结果表明 ,模拟得到的气泡的形状与实验现象相接近 .     

Numerical analysis on thermal regime in double-loop channel inductor

In order to investigate the temperature distribution, a three-dimensional finite element model (FEM) was developed to simulate the temperature regime in the channels of double-loop inductor, and the simulated results were compared with experimental data from low load trials of a 400 kW inductor. The results of numerical simulations, such as the temperature and Joule heating rate, show reasonable correlation with experimental data. The results indicate that Joule heating rate and the temperature reach the maximum at the corners and the minimum at the centre of the cross-section area. The temperature difference between the inlet and outlet is in an inverse proportion to mass transport. Joule heating rate and the temperature are directly proportional to power frequency. It is concluded that mass transport and power frequency play a critical role in determining the temperature regime and Joule heating rate, the relative permeability of the magnetic core shows no significant influence on temperature regime and Joule heating rate, when the relative permeability varies from 5 000 to 10 000.     

一种土壤湿度检测系统设计

本文设计了一种无线土壤湿度采集装置,该装置通过湿度传感器HS1101对土壤湿度进行采集,然后将采集到的数据通过无线模块PTR2000发送出去,接收方接收到数据后解包,计算出湿度值并在液晶屏上显示。系统发射部分以AT89S52为核心,包括湿度采集、无线发射。接收部分也以AT89S52为核心,将无线接收、液晶显示结合起来,通过适当的软、硬件抗干扰处理,该系统具有实用性、小型化等特点。     

Numerical analysis on Joule heating of double-loop channel induction furnaces

In order to investigate Joule heating power, a three-dimensional finite element model (FEM) was developed to predict Joule heating power in the channels of double-loop inductor. The simulated results were compared with experimental data from low load trials for a 400 kW inductor. The results, such as power factor and Joule heating power, show reasonable correlation with experimental data, and Joule heating rate reaches the maximum at the corners and the minimum at the centre of the cross-section area. With increasing relative permeability of iron core, length of coils, current frequency and resistivity of metal melt, the power factor and Joule heating power change. It is concluded that current frequency, the resistivity and length of the coil play a critical role in determining the power factor and Joule heating power, whereas relative permeability of the magnetic core shows no significant influence on them.     

利用COSMIC电子密度数据分析全球NmF2

利用COSMIC掩星观测获得的电离层电子密度数据,对2009年不同季节的电离层F2层峰电子密度分布特征进行了研究.采用人工神经网络插值技术,以世界时、地理经度、纬度、F2层峰电子密度及地磁活动指数Kp作为人工神经网络输入层的5个神经元,以NmF2作为输出层神经元,获取全球分布的NmF2.结果显示,位于南半球的威德尔海异...     

客户导向的制造企业供应商绩效评估

市场经济的不断发展使竞争从以往的企业层面过渡到如今的供应链层面，加大了企业在供应商选择方面的压力，文章系统分析了传统供应商绩效评估方法的局限性，进而提出了客户导向的供应商绩效评估模型，并通过实际算倒来验证该模型较之传统评估模型在评估结果的敏感性和完备性方面的优势。     

TP110SS抗腐蚀特殊扣套管复合力试验焊接工艺

分析了TP110SS抗腐蚀特殊扣套管复合力试验的受力情况，指出焊缝质量对此试验的重要性，并研究了套管和堵头的焊接性，选择了合理的焊接工艺，保证了复合力试验的顺利进行。