电磁流量计的智能化

电磁流量计的智能化开封仪表厂张稚，韩书芳智能化电磁流量计是一种以计算机技术为核心的自动测试系统（ＡＴＳ）。有显示数字化、计算与控制软件化和运行参数可编程及以下特点：１．提高励磁技术水平，改善测量性能励磁技术是衡量电磁流量计测量性能的关键技术之一。电磁...     

电磁流量计在氧化铝生产中的应用

本文介绍了氧化铝工艺流程及流程物料特点，电磁流量计工作原理结构特点，介绍了电磁流量计在氧化铝生产中的应用状况，指出应用过程中存在的问题及解决办法。     

电磁流量计在酸性废水处理中的应用

介绍Khrone公司生产的电磁流量计在不锈钢酸性废水处理中的应用,探讨了电磁流量计的测量原理和结构,以及安装技术要求和常见的故障,对于掌握该流量计的使用方法和性能具有一定的指导作用,为电磁流量计在线测量提供了一定的参考。     

电磁流量计在工业污水处理中的应用

介绍了新型电磁流量计的工人原理和系统组成。并结合污水处理工艺将电磁流量计与其他流量计进行分析比较,从理论和实践上阐述电磁流量计在工业污水处理环节流量测量的优势。     

双激励电磁流量计的研究

在对电磁流量计技术的不断研究中认识到,电磁流量计传感器具有电极与导电流体间的特有关系,可以引入一个电压激励下的新的阻抗分压测量关系,使电磁流量计传感器在磁场与电压两种激励下以交替方式工作,组成两个参数的测量关系,形成一种新型的双激励电磁流量计。     

地浸矿山中电磁流量计故障分析与应对措施

电磁流量计是根据法拉第电磁感应定律测量流量的电子仪表。它的输出信号和被测流量具有线性、精确度较高的特点,可测量电导率不小于5μs·cm-1的酸、碱、盐溶液、水、污水、腐蚀性液体、泥浆、矿浆以及纸浆等流体流量的特地。因其测量的特点,电磁流量计在地浸采铀工艺生产过程中得到了广泛应用,但是在使用过程中电磁流量计经常出现各种故障影响其正常工作。通过检测电磁流量计的各组成部件和电路板,分析电磁流量计常见故障,提出了相应的解决措施,可以有效排除电磁流量计的故障,降低电磁流量计的故障率。     

电磁流量计的正确安装与使用

电磁流量计作为一种成型的速度式流量计,在工业导电性流体流量测量方面广为应用。简述电磁流量计的原理、构成、安装、使用要求,并对常见故障进行分析,说明正确使用电磁流量计的方法。     

HB3603系列电磁流量计的研制

为进一步提高电磁流量计的应用范围及测量精度,研制了HB3603系列电磁流量计,介绍了该系列流量计的工作原理及关键设计技术.该系列流量计具有结构合理、功能齐全、测量准确等技术特点,可广泛应用于各类工业现场.     

电磁流量计干标定技术

介绍电磁流量计干标定技术的研究现状及工业化应用前景,阐述电磁流量计干标定原理.指出如何准确测量有效区域内各点磁场信息是电磁流量计干标定技术工业化应用的关键技术,利用电磁流量计磁场的交变特性,通过测量电磁感应所产生的其他物理量间接获取电磁流量计有效区域内磁场信息,是解决此关键技术的有效途径,并以此为基础重点分析了涡电场测量法与面权重函数法这两种新型干标定方法的测量原理、特点及实现方法.此项技术为我国开展电磁流量计干标定技术的研究及工业应用提供技术参考.     

用于石油测井的连铸机电磁流量计误差分析

针对石油测井用连铸机电磁流量计在测量混合流体时存在较大误差的问题,开展用于石油测井的连铸机电磁流量计误差研究。分析连铸机与连铸机电磁流量计结构原理,设计连铸机电磁流量计误差补偿算法。校准组分流体中连铸机电磁流量计参数,得到改变组分后流量计的校准数据,引入最小二乘法拟合连铸机电磁流量计特征曲线,输出信号的组分补偿系数,应用到连铸机电磁流量计特征曲线补偿中,实现特征曲线实时补偿。实验结果表明,所提方法测量误差绝对值与附加误差能够始终保持在2%以下,证明该方法能够有效降低测量误差和附加误差,测量效果较好。     

便携式低功耗电磁流量计测量电路的设计

本文对低功耗电磁流量计的测量电路进行了研究,给出了测量电路的基本组成。根据被测信号的特点,即微弱信号在强干扰下的测量,阐述了测量电路的工作原理。本测量电路主要用于电池供电的电磁流量计中,可以实现便携式低功耗的工作要求。     

On the effect of the electrode shape and contraction section on the right-angled electromagnetic flowmeter

Flow measurement is of great importance in many industries, such as the chemical industry, energy and urban drainage. Electromagnetic flowmeter is widely used due to its wide range, high response and suitability for multiphase flow detection. To meet the needs of small-caliber and low-flow applications and wider installation scenarios, this paper proposes a new insertion-type right-angled bent electromagnetic flowmeter. The measurement signal of the electromagnetic flowmeter is closely related to its internal fluid flow state, thus computational fluid dynamics (CFD) method is used to optimize the electrode shape and contraction section shape of the electromagnetic flowmeter. Through comparison experiments of flat electrodes and cone electrodes, a better model is obtained. Furthermore, three new models of the contraction section are proposed: the sharp contraction type, the gradual contraction type, and the Widosinski curve contraction section. The Widosinski curve contraction section is easier to stabilize the flow field inside the flowmeter. The experimental data are in good agreement with the results of the large eddy simulation, and the results show that the measurement performance of the cone electrode is better than that of the flat electrode. When measuring small flow rates, the error of the cone electrode is only 5%, much smaller than the error of the flat electrode. The findings of this study provide a new idea for the development and optimization of the measurement performance of the right-angled electromagnetic flowmeters.     

一种新式差压流量计的设计与应用

该文分析了影响蒸汽流量准确计量的主要因素,介绍了传统的蒸汽流量计如孔板流量计和涡街流量计的使用局限性,详细介绍了一种基于皮托管原理的新式差压式流量计的设计原理、结构特点及其标定方法,通过实例给出了典型蒸汽工况下选择流量计的考虑因素,以及应用这种新式差压式流量计的选型和计算过程。     

几种流量测量仪表的应用研究与发展

为解决不同介质、物性与流况的测量问题,国内外近年来应用与研究、开发与发展成果显著。本文详细介绍了节流式、均速管、电磁式、涡街式及质量流量计的应用研究与发展情况。介绍了笔者一些成果和应用研究的经验,解决了有关部门测量中一些技术难题．     

Electromagnetic flowmeter evaluation in real facilities: Velocity profiles and error analysis

The reliability and accuracy of a flowmeter depends on its installation conditions, as an improper installation may distort the end results. The objective of this work was to determine the errors obtained in an electromagnetic flowmeter of 100 mm diameter, installed in common real conditions, that is, not obeying the straight pipelines length recommended in flowmeter standards. To achieve this objective of the work, the electromagnetic flowmeter was installed in four different conditions: installed downstream of a 90° curve and downstream of two curves of 90°, both of short radius; downstream of a gate valve, openings of 100% and 50%. During the research, flow velocity profiles were obtained, with the purpose of evaluating the influence of profile distortion on the performance of the meter. The tests were carried out in the Laboratory of Hydraulics and Fluid Mechanics of FEC-Unicamp, Brazil, and the results are consubstantiated in comparative graphs, which demonstrate the influence of the velocity profile on the flowmeter response and accuracy for each setup bench.     

多对电极电磁流量计传感器电极阵列设计

在多对电极电磁流量计系统中，传感器电极阵列的设计影响到整个流量计系统的测量精度。为了得到更高的测量精度，在介绍了多电极电磁流量计基本原理的基础上，用有限差分法求解了电磁流量计的基本方程，并采用弦端压差测量方法研究了不同的电极数目和电极尺寸对平均流速估计的影响，以及这两方面及其他物理条件如管道直径、后继转换电路阻抗匹配在电极阵列优化设计中的相互制约关系。为多电极电磁流量计的电极阵列设计提供了具体而明确的设计准则。     

海油平台上电磁流量计的安装与常见故障分析

根据海洋石油平台和电磁流量计的应用经验．分析电磁流量计工作特性,对电磁流量计的安装和常见故障进行分析诊断。     

一种改进的H桥放电回路

文章以电磁流量计为载体,分析了传统的电磁流量计的励磁系统,指出了由于缺乏良好的放电回路而产生尖峰虚电压,并对电源造成冲击。由此提出了一种改进的H桥驱动电路的控制方法,可以提供良好的放电回路,提高了电磁流量计励磁系统的性能。     

Theoretical study of vertical slug flow measurement by data fusion from electromagnetic flowmeter and electrical resistance tomography

Electrical resistance tomography (ERT) can be used to obtain the conductivity distribution or the phase distribution of gas/liquid flows (e.g. slug flow). Using proper parameter models and flow regime identification models, the measurement of phase size, void fraction, and pattern recognition can be realized. Electromagnetic flowmeters have been used to measure conductive single-phase liquid flows. However, neither ERT nor electromagnetic flowmeters (EMF) can provide accurate measurement of gas/liquid two-phase flows. This paper presents an approach to fuse the information from ERT and an electromagnetic flowmeter. A model for the measurement signal from the electromagnetic flowmeter has been developed based on the flow pattern and the phase distributions, which are obtained from the reconstructed images of ERT, aiming to reduce the measurement error of the electromagnetic flowmeter and enhance the measurement accuracy. Through the simulation research of virtual current density distribution, the feasibility of fusion of electromagnetic flowmeter and ERT to measure gas/liquid two-phase vertical slug flow is verified. By theoretical analysis, the relationship between the output of electromagnetic flowmeter and flow parameters is established. The electrical potential difference of the electromagnetic flowmeter, average velocity, volume flow rate and gas void fraction between the bubble size and location are also investigated. The fusion approach can be used to measure vertical slug flows.     

应用双光纤传感器的涡轮流量计结构、特性及试验研究

本文叙述了将反射型光纤传感器与传统的涡轮流量测量原理相结合,进行具有双光纤传感器的涡轮流量计的实验研究。与传统的内磁式涡轮流量计相比具备了正反流量测量的性能。实验研究结论表明：应用双光纤传感器涡轮流量计可进行双向流量测量,两个流量信号经鉴别电路实现了双向流动的检测。对于单向流量测量,也可通过流量计算机的算法消除因水击产生的脉动流造成涡轮往复震动而引起的计量误差。扩展了涡轮流量计的量程比,不存在内磁式传感器在低流速时与涡轮叶片产生磁阻而引起的误差。