Application of gas mass flow meter in generator industry

Abstract: The application information of gas mass flow meter in the generator industry is provided by excellent flow meter and flow meter manufacturers. 1. Vortex flowmeter (gas) ▲Vortex flowmeter features: no moving parts, high measurement accuracy, small pressure loss, the detection element is not in contact with the measured fluid, the output signal and the temperature, pressure, density, composition, Parameters such as viscosity are irrelevant. . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application article details of gas mass flowmeters in the generator industry. 1. Vortex flowmeter (gas) ▲Vortex flowmeter features: no moving parts, high measurement accuracy, small pressure loss The detection element is not in contact with the measured fluid, the output signal and the temperature, pressure, density, composition, Parameters such as viscosity are irrelevant. ▲Principle of vortex flowmeter: It uses the Karman vortex principle in fluid mechanics to measure fluid flow. A vortex generator (a non-streamlined symmetrical body such as a cylinder, a triangular column, etc.) is inserted vertically into the pipeline. When the fluid flows in the pipeline, vortices will be generated alternately on the left and right sides behind the vortex generator to form a vortex column. The two rows of vortices are parallel to each other, and appear alternately from left to right, with opposite directions of rotation. The frequency f (Hz) of the vortex has the following relationship with the average flow velocity v (m/s) of the fluid and the width (m) of the vortex generator: f=St*v/d (St is the Strouhal coefficient, which is related to the vortex The width d of the generating body is related to the fluid Reynolds number) ▲The use of the vortex flowmeter is relatively simple and the installation is relatively convenient. It is divided into two types: insertion type and pipeline type. When installing, it should be noted that the flow direction of the fluid should be the same as the direction indicated by the flowmeter. ▲Disadvantages of vortex flowmeter: small range ratio (15:1); greatly affected by vibration; the size of the pipeline is proportional to the price; it needs temperature and pressure compensation to measure; the small range is insensitive, unstable, and almost impossible to measure . 2. Ultrasonic flowmeter (gas) ▲Ultrasonic flowmeter features: no pressure loss; simple installation; nothing to do with the temperature, pressure, viscosity, etc. of the fluid itself; no moving parts; it can measure dirty, corrosive gases and multi-components gas. ▲ Principle of ultrasonic flowmeter: measure the propagation time of ultrasonic waves in the upstream and downstream directions in the pipeline, and then calculate the flow rate of the fluid. The flow rate of the fluid can be obtained by the flow rate of the medium, the diameter of the pipe, and the dynamic correction of the fluid by the Reynolds number. Specifically: in the pipeline with“Z”A pair of ultrasonic sensors are installed, and the distance L between the two sensors is used as the propagation distance of the ultrasonic wave. The forward and reverse propagation times of ultrasonic waves between the two sensors are expressed as: Ts=L/(C+Vcosθ); Tn=L/(C-Vcosθ) where C is the speed of the sound wave in still air, which is a function of the gas properties, unit: m/s. V is the flow rate of the gas medium, in m/s.θis the angle between the sound wave travel and the axis of the pipe. ▲Ultrasonic flowmeter is also more convenient to use. on the surface of the pipe with“Z”For type installation, it should be noted that the installation place of the sensor should be polished and greased, and the sensor and the pipe should be tightened with the fixing device. ▲Disadvantages of ultrasonic flowmeter: small range ratio (15:1); relatively troublesome maintenance; high gas precision and high price; measurement requires temperature and pressure compensation; 3. Rotameter (gas) ▲Features of rotary flowmeter: just Ground display, no power supply; relatively cheap price; it has two materials, commonly used glass tube rotameter and metal tube mass flowmeter. Both local display and remote display are available, and the interfaces are in the form of HART, standard current signal, PROFIBUS, etc. ▲Principle of rotor flowmeter: The rotor flowmeter is also a kind of velocity flowmeter. It consists of two parts, one is the upper and lower conical tubes, and the other is the rotor (also called the float) placed in the conical tube. The weight of the rotor is balanced by the differential pressure ΔP generated when the fluid passes through the gap (throttle area) between the rotor and the conical tube wall. When working, the fluid to be measured flows in from the lower end of the conical tube and flows out from the upper end. The magnitude F of the upward supporting force generated by the fluid on the rotor is always equal to the weight G of the rotor, that is, F=△P*A; G=V*(ρt-ρf) g Since F=G, △P*A=V*(ρt-ρf) g△P=V*(ρt-ρf) g/A (1) where V—The volume of the rotor; A—The maximum cross-sectional area of ​​the rotor; g—local gravity;ρt-ρf is the rotor material and the density of the fluid to be measured, respectively; ΔP is the pressure difference between the upper and lower fluids in the vertical direction of the rotor. According to formula (1), in the whole working process, the pressure difference remains unchanged. When the flow rate increases, of course, the flow velocity through the throttling area also increases. Only by increasing the throttling area and reducing the flow velocity, the pressure difference ΔP remains unchanged. Therefore, the flow rate can be read according to the level of the balance position of the rotor. The formula (2) can be used to express Q=k*h(2△P/ρf) 1/2 (2) where k—is the instrument constant; h—Height at which the rotor floats. Substitute into formula (1) to get Q=k*h(2gV(ρt-ρf)/(ρf*A)) 1/2▲ The use of the rotameter is more convenient. It is enough to tighten the corresponding bolts during installation, but it should be noted that the direction of fluid flow must be vertical upward. ▲Disadvantages of rotameter: the range ratio is small 10:1; the pressure loss is relatively large; the dirt is easy to block; the installation and maintenance are relatively complicated; it is greatly affected by vibration; it needs temperature and pressure compensation, etc.; Below DN200. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Application of Gas Mass Flow Meter in Generator Industry'

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