Petrochemical industry rosemount mass flowmeter scale measuring principle and application analysis

Abstract: the petrochemical industry rosemount mass flowmeter scale measuring principle and application of basic information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: this article mainly introduced the rosemount coriolis force mass flowmeter ( CMF) Working principle of sensor, transmitter, flowmeter was introduced in detail the principle of measurement of the mass flow measurement principle and the density, transducer signal characteristics, DSP digital signal processor. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a petrochemical industry rosemount mass flowmeter scale measuring principle and application analysis article details. This article mainly introduced the rosemount coriolis force mass flowmeter ( CMF) Working principle of sensor, transmitter, flowmeter was introduced in detail the principle of measurement of the mass flow measurement principle and the density, signal transmitter, DSP digital signal processor and application. Preface rosemount mass flowmeter is widely used in petrochemical and other fields, is the one of zui advanced flow measurement instrument in the world, in my factory main products such as ethylene, propylene and reliable measurement of the main raw materials such as light hydrocarbon, precision up to 1. 7‰ For our energy and material flow to improve the measurement accuracy, to avoid the unnecessary loss, created a considerable economic benefits. Mass flow rate measurement principle of a mass flowmeter metering system includes a sensor and a transmitter for signal processing. Rosemount mass flowmeter based on Newton's second law: force = quality & times; Acceleration ( F=ma) As shown in figure 1, when the quality as the m's particle velocity V in the P axis angular velocity & omega; Rotating movement of the pipe, particle acceleration and force: (by two components 1) Normal acceleration, i. e. , the centripetal acceleration & alpha; R, its value is equal to 2 & omega; Towards r, P axis; ( 2) Tangential velocity & alpha; T, i. e. , coriolis acceleration, its value is equal to 2 & omega; V, the direction and & alpha; R vertical. Due to the complex movement, the particle & alpha; T direction on the coriolis force Fc = 2 & omega; Vm, pipeline for a reverse force - the particle effects Fc=- 2ω Vm。 When the density of & rho; The fluid flow in the rotating pipe flow at a constant speed V, any length & Delta; X pipeline will be subject to a tangential coriolis force & Delta; Fc：Δ Fc=2ω Vρ 一个Δ x( 1) Type, A— Pipe circulation area. Because of relation: mq = & rho; VA: so & Delta; Fc=2ω qmΔ x( 2) As a result, directly or indirectly measured in rotating pipe flow fluid of the coriolis force can be measured mass flow rate. The sensor is u-shaped flow tube ( FIG. 2) , in no fluid flowing through the flow tube, the flow tube driven by installed in the discharge pipe of electromagnetic coil driver, its amplitude is less than 1 mm, about 80 hz frequency, fluid flowing into the flow pipe were forced to accept flow of vertical movement up and down. In the flow pipe vibration up half a cycle, the fluid resistance tube upward movement and places a downward force on the discharge tube; On the other hand, the flow pipe flow of fluid to exert an upward force to resist the pipe downward movement and reduce the vertical momentum. Distorted, it will lead to traffic tube in the vibration of the other half cycle, flow pipe vibration down, twist direction, on the other hand, the distorted phenomenon known as the coriolis ( Coriolis) Phenomenon, namely the coriolis force. According to Newton's second law, the size of the flow tube distortion quantity completely and flowing through the flow tube mass flow rate is proportional to the size, installed on the discharge pipe on both sides of the electromagnetic signal detector for detecting the vibration of the flow tube. When there is no fluid flow through the flow tube, pipe flow does not produce distortion, on both sides of the electromagnetic signal detection signals are in phase detector ( Figure 3) ； When the fluid flowing through the flow tube, tube produces distortion, leading to phase difference of two detection signal, the phase difference of size is directly proportional to the mass flow rate through the flow tube. Because of the mass flowmeter is mainly rely on the vibration of the flow pipe to the flow measurement, the vibration of the flow tube, and flow through the pipeline fluid force cause the coriolis force, to cause each flow tube, torsion and vibration cycle through the flow tube quality is directly proportional to the velocity. Due to a distortion of the flow pipe lagging behind other * tube distortion, the quality of the tube on the sensor output signal by comparing circuit, to determine the amount of distortion. Circuit by the time difference detector measured around the time lag between the signal. This & other; Time & throughout; Δ T through digital quantity measurement, processing, filtering to reduce noise, improve the measurement resolution. Time on the flow calibration coefficient of mass flow rate. Because of the influence of temperature flow pipe rigidity, coriolis force produced by distortion quantity will also be affected by temperature.

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