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。     

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。     

管道对电磁流量计敏感场影响研究

运用有限元软件ANSYS对电磁流量计中存在非导电物体建立的仿真模型,研究了不同内径管道对电磁流量计敏感场响应特性的影响,为电磁流量计测量两相流时传感器电极尺寸设计提供一定的参考,也为电磁流量计在一定管径下两相流测量的误差分析提供理论依据。     

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.     

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.     

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。     

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。     

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。     

西尼尔SE11H混频励磁电磁流量计在太阳纸业浓黑液工段测试成功

正西尼尔继SE11E高精度快速响应型电磁流量计发布并在制药等行业成功应用后,西尼尔研发中心历时三年,经过不断的研发攻坚,成功研制出SE11H混频励磁电磁流量计,目前SE11H混频励磁电磁流量计发布前的测试工作已经完成并取得良好效果。西尼尔SE11H混频励磁电磁流量计是专为解决造纸、采矿、煤化工等行业浆液测量难题而推出的一款高端系列智能电磁流量计,励磁频率能够根据测量介质自适应调整,采用最佳的励磁频率组合在测量中实现强抗干扰能力和零点稳定性能,此外SE11H混频励磁电磁流量计还具有快速响应、高精度(±0.2%)等性能特点。     

节流型流量计的比较选型及应用

从原理、计算方法和性能等方面对目前应用广泛的几种流量计进行比较和分析,得出了节流型流量计是一种经济性好、稳定性好、使用方便的流量计的结论。介绍了几种节流型流量计的选型方法,具体介绍了新型节流装置德尔塔巴流量计在某选矿厂浮选作业空气流量检测中的应用情况。     

科里奥利质量流量计检定误差分析与对策探讨

科里奥利质量流量计在能源和化工品等领域的贸易结算中应用较广,其具有测量效率高、精度准确和运行稳定可靠的特点。目前,人们对科里奥利质量流量计的使用提出了更高的精度要求,因此有必要进行其检定误差的消除处理。以万华(宁波)化学有限公司2019年的大修项目为例,在阐述流量计检定准确性影响因素的基础上,就项目检定与误差分析过程进行深入分析,指出科里奥利质量流量计检定误差处置办法,期望能进一步提升科里奥利质量流量计检定精度,继而为相关行业贸易实现和经济发展提供有效保证。     

Analysis of signals from vortex flowmeters

The vortex flowmeter is used to measure the flow of fluids especially where the requirements include wide rangeability and the use of flowmeters with no moving part. It is common knowledge that process conditions affect the operation of a vortex flowmeter, and a customary approach is to introduce flow conditioners so that the measurement output from a vortex flowmeter conforms to specified standards. Some recent studies have shown how to apply signal analysis to the signal from vortex flowmeters to enhance performance, but the signal which has been typically analysed is the pulse train. In this paper,we advocate a new approach which involves detailed analysis of the unconditioned signal from the sensor prior to conventional signal conditioning. The results obtained from this approach open opportunities for the development of alternative signal conditioners and transmitters which not only enhance the quality of the measurement output from a vortex flowmeter but also make it possible to use the flowmeter for monitoring the condition of the plant.     

High-precision Coriolis mass flowmeter for bulk material two-phase flows

For measuring or dosing purposes in gas/solid two-phase flows (non-pressurized and pressurized systems) a mass flux measurement device based on the Coriolis principle has been developed. The Coriolis flowmeter developed is applicable for on-line measurements of the mass flux, showing a fast response time to load variations and measuring accuracies of ±1% of the actual measured value. The Coriolis flowmeter was successfully tested in pilot and industrial plants. Different granular materials, such as coal dust, quartz sand, feldspar, plastic granulates and foodstuffs have been measured already. In practice, the Coriolis flowmeter has shown reliable operation in various applications in process engineering. The integration of the Coriolis flowmeter into advanced control systems for feeding or dosing purposes opens new possibilities for on-line control and exact dosing of gas/solid two-phase flows.     

Problems in the theory and design of electromagnetic flowmeters for dielectric liquids. Part 3a. Modelling of zero drift due to flux linkage between coil and electrode cables

This paper investigates theoretically the magnitudes of zero offsets and zero drifts originating from magnetic flux linkage between the coils of the electromagnet and the loop formed by the electrode cables in an electromagnetic flowmeter for dielectric liquids. The dependence of such zero offsets on liquid properties, frequency of operation, etc. is explained. The paper gives the results of measurements of the effective electrical conductivity and permittivity of dielectric liquids BP180 and Castrol OX-9 (and mixtures of these) in the frequency range 1 Hz–1 kHz. These are used to predict the zero offsets expected in metering these liquids using phase sensitive detection with the flowmeter tube described in Part 1 of the paper. Precautions needed in flowmeter design to minimise instrument zero offsets and zero drifts are explained. The electromagnetic flowmeter theory was developed at Cranfield and the determination of the electrical properties of the dielectric liquids was carried out at QinetiQ.     

质量流量计计量准确度的影响因素

科里奥利质量流量计已经在石油天然气计量交接领域得到广泛应用。其工作的准确性影响着计量的公平、公正,而在科里奥利质量流量计运行安装和运行中存在着诸多因素可影响其计量的准确度。分析影响其准确度的因素,在使用过程中逐步消除如压力、温度、密度、安装条件等方面的影响,使流量计的计量更加精准。     

A technique for low cost calibration of large electromagnetic flowmeters

The need for calibration of electromagnetic flowmeters adds considerably to the cost of these instruments especially in the larger sizes. This paper discusses a proposed technique for calibration of large electromagnetic flowmeters which avoids the need for a calibration flow rig. The technique consists essentially of filling the flowmeter tube with water, operating the electromagnet as it would be operated in normal flowmeter operation and measuring the axial component of the eddy current electric field in the water over each electrode. This allows the calibration factor for a flat velocity profile to be determined.     

A heat thermistor gas microflowmeter

The design and operating principle of an autonomous thermistor gas microflowmeter are described. The instrument can operate in constant-power and constant-temperature modes and yields output signals in the ohmic, frequency, and current forms. The autonomous operation of the flowmeter is ensured by the temperature stabilization of the controlled medium at a specified level. The results of the experimental studies of the instrument’s characteristics are presented, and the methods for their improvement are shown. Its accuracy is estimated at a level of ～0.5% at a gas flow rate of 60–70 mg/s, and the time constant is ～3 s. Owing to its hermetically sealed housing, the flowmeter can be used in a vacuum chamber.     

Response of a dual triangulate bluff body vortex flowmeter to oscillatory flow

In this paper, on an experimental facility, the measurement characteristics of a diameter 50 mm dual triangulate bluff body vortex flowmeter in steady flow and oscillatory flow were investigated. Then, the Hilbert Huang Transformation (HHT) method was used to assess the anti-interference performances and the vortex street stability in oscillatory flow for the dual triangulate bluff body vortex flowmeter and a single bluff body vortex flowmeter. Offline simulation was carried out on the anti-interference performances of the dual triangulate bluff body vortex flowmeter signal noise in oscillatory flow by the method of the EMD-scales filter. The major findings are: (a) in most case, the EMD-scales filter may be as good at de-noising effect for the dual bluff body vortex flowmeter in oscillatory flow than that for the single bluff body vortex flowmeter in oscillatory flow. The vortex street stability in oscillatory flow for the dual bluff body is similar to that for the single bluff body. (b) In some special case, the EMD-scales filter is unable to play a better de-nosing role for the dual bluff body vortex flowmeter in oscillatory flow. The invalid condition of the EMD-scales filter for the dual bluff body vortex flowmeter in oscillatory flow is different to that of the single bluff body vortex flowmeter and it was advanced in this paper. (C) The vortex street stability for the dual bluff body vortex flowmeter is better than that for the single bluff body vortex flowmeter.     

德尔塔巴流量计在流量测量中的应用

介绍了一种用于流量测量的德尔塔巴流量计,简述了德尔塔巴的测量原理以及基本结构,详细的介绍了德尔塔巴流量计的特点并与孔板、转子流量计、涡街流量计等常见的流量仪表进行了对比,通过实例阐述了德尔塔巴在实际工程应用中的价值。