渤海某高含二氧化碳油气田海管腐蚀研究

渤海某油气田海管目前采用油气水三相混输.由于采出气高含二氧化碳,海管可能发生二氧化碳腐蚀.本文介绍了通过在该海管入口及出口安装旁路式海管内腐蚀监测系统,对该海管在油气水三相混输状态下的内腐蚀情况进行了研究.     

三相异步电动机的节能改造

介绍了三相异步电动机的工作原理和节能方法。通过采用可控硅节能器,可以节约大量电能。     

某海上油田三相分离器的失效原因

通过对某海上油田三相分离器进行现场调研,结合X射线衍射分析、硬度测试及阴极保护模拟计算对其罐体出现腐蚀和焊缝开裂的原因进行分析。结果表明:造成分离器罐体内壁底部腐蚀的主要原因是涂层与阴极保护失效状态下的CO2腐蚀、H2S腐蚀和典型的垢下腐蚀;焊缝开裂原因主要在于焊缝补焊后未进行热处理,局部硬度过高发生硫化物应力腐蚀开裂。     

三相串联谐振逆变器混合对称控制策略研究

为了解决对三相无线电能传输系统传输功率的有效控制问题,基于电压型三相串联谐振逆变器,在传统180o导通模式的基础上,提出了一种新型的开关管开通-关断混合对称控制模式：通过在开关管180o开通过程中加入关断短脉冲,在开关管180o关断过程中加入开通短脉冲,改变系统谐振补偿网络等效输出线电压和相电压,实现系统功率传输能力的有效控制。通过对该系统工作模式的分析,推导出了系统功率传输能力与开关短脉冲对应电角度之间的函数关系,为无线电能传输系统的设计和分析提供了理论依据。仿真和实验结果证明了该新型控制策略可以有效地控制传输功率,同时验证了理论分析的正确性。     

浅谈客户导向的供电业扩报装集约化管理

根据供电企业的业务扩展与电表申报安装的实际情况,分析客户电力消费现实,提出构建以客户需求为导向的业扩报装集约化管理模式;建立分级管控体系、营配协同管控体系、项目经理制体系、统一验收标准体系、“三查”监督管控体系与“三电”差异化服务体系;采取相应的组织结构、营销手段措施,提高业扩报装效率与质量.     

Studies of the evaporation and scaling mitigation in a recirculating three-phase fluidized bed

Heat transfer of liquid evaporation was studied in a recirculating three-phase fluidized bedin which an inert gas serving as"carrying gas"was introduced.The gas velocities,particle sizes,par-ticle densities and particle concentrations in the liquid were examined.Heat fluxes were measured aswell.Significant enhancement in heat transfer was resulted when an inert gas and solid particles wereintroduced into the flow boiling liquid.Scaling mitigation was to be expected in the process.     

基于FPGA的三相四线制APF数字低通滤波仿真

针对三相四线制APF谐波检测中低通滤波器影响检测精度和补偿效果的问题,分析了数字低通滤波器的类型、阶数、截止频率,采样频率对APF谐波检测效果的影响,选定二阶巴特沃思数字低通滤波器。提出将FPGA用于处理谐波检测,通过改进瞬时无功功率理论的I p-Iq谐波检测方法和合适的低通滤波器配置,解决电网负载不平衡问题。仿真结果表明：采用此方法,时延仅为200ns,对基波没有影响。     

三相流重力热管冷凝段传热性能研究

为拓展三相流强化传热和防、除垢技术的应用领域,优化重力热管的传热性能,设计并构建了1套三相流闭式重力热管系统。考察了固含率、加热功率、充液率等参数对于三相流重力热管冷凝段传热性能的影响。结果表明,三相流重力热管可以强化传热。冷凝段对流传热系数随着加热功率的增加而增大,随着充液率的增加而减小。充液率较低时,冷凝段对流传热系数随着固含率的增加而增大;而当充液率较高时,随着固含率的增加,对流传热系数则呈现出先增加,后降低,然后再增加的变化趋势。     

三相加压氧化制备锰酸钾的反应动力学

以锰粉为原料,采用三相加压氧化制备锰酸钾。利用未反应收缩核模型研究了锰粉粒度、温度和氧分压等因素对二氧化锰转化率的影响,得出了各因素的动力学方程。该反应的表观反应活化能为110.18kJ/mol,反应速率受表面化学反应控制。     

Investigation of pressure drop in a cocurrent downflow three-phase moving bed

Based on a self-established cold-flow experimental device, the pressure drop in a cocurrent downflow three-phase moving bed was investigated under a wide range of gas, liquid, and solid flow rates during dynamic and steady-state operation. The results showed that for the startup of the bed, since the first bed layer packed by fall-falling of particles had lower voidage, it would take at least one bed volume time to make the voidage in the bed reach the steady-state. Under steady-state conditions, the pressure drop increased with the increase of gas and liquid mass flow rates, liquid viscosity, and decreased with the increase of solid flow rate. Furthermore, it was found that the liquid distribution became more uniform due to particle movement. The experimental data obtained in this study was used to develop a correlation to predict the pressure drop in a three-phase moving bed with an average relative error of 9.32%.