Ethylene glycol flowmeter | Which parts of the equipment are prone to icing and blockage during winter operation

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1. Working principle of flow sensor

The flow sensor converts the medium flow rate or flow rate into measurable signals through different physical principles. The main working principles include heat conduction, Coriolis effect, ultrasound, vortex street, differential pressure, and electromagnetic induction. Specifically, the principle of heat conduction is based on the relationship between medium flow rate and heat transfer: changes in flow rate cause changes in the rate of heat dissipation on the sensor surface, and the flow rate is calculated by measuring the temperature difference. For example, the Turck FTCI series flow sensor detects flow velocity and calculates flow rate based on the cross-sectional area of the pipeline, which is suitable for water or ethylene glycol mixtures, but is greatly affected by the thermal conductivity of the medium. The principle of Krioli effect uses the Coriolis force generated during the flow of a medium for measurement: when the medium flows through a bent or vibrating tube, it will cause oscillations related to the flow velocity, and the mass flow rate can be calculated by detecting the oscillation frequency or phase difference. This type of sensor (such as mass flow meters) has high accuracy, wide dynamic range, and low pressure loss, and is suitable for gases and liquids, but the cost is relatively high. The principle of ultrasound can be divided into Doppler method and runtime method. Doppler method uses the frequency shift (frequency difference) generated by the reflection of sound waves from particles or bubbles in the medium to calculate the flow velocity, and is suitable for liquids containing suspended particles. Run time method: Calculate the flow velocity by meas

uring the time difference between the propagation of ultrasonic waves in the forward and backward directions. For example, when ultrasonic waves propagate in the same direction as water flow, the propagation time is shorter, and when they propagate in the opposite direction, the propagation time is longer. The vortex street principle (parakinetic vortex frequency method) involves placing a blocking fluid (such as a cylinder) in a fluid to form a Karman vortex street. Regular vortices alternate on both sides of the blocking fluid, and the vortex frequency is proportional to the flow velocity. Turck FCVI vortex flowmeter is suitable for water and cold water circuit control by sensing pressure and temperature fluctuations, but it is necessary to avoid unstable vortices at low flow rates. The differential pressure method (Bernoullis principle) is based on the relationship between pressure drop and flow velocity in narrow pipelines: when the fluid passes through a constricted pipe opening, the flow velocity increases and the pressure decreases, and the flow rate is calculated based on the pressure difference and known pipeline parameters. This method has a simple structure, but requires stable fluid density and is suitable for gases and liquids. The principle of electromagnetic induction is applicable to liquids with a conductivity greater than 15 μ S/cm: when charged particles move in a magnetic field, an induced voltage proportional to the flow velocity is generated, and the flow rate is calculated by measuring the voltage. Electromagnetic flow meters (such as FCMI type) have no mechanical moving parts, low pressure loss, and a measurement accuracy of 2% of the measured value, but only for conductive liquids. There are sign

Ethylene glycol flowmeter | Which parts of the equipment are prone to icing and blockage during winter operation

1. Working principle of flow sensor

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