What type of flow meter is suitable for low-viscosity liquefied hydrocarbons?
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Before feeding into the batch reactor, vacuum is created to achieve a negative pressure, after which liquefied butadiene is added. Currently, an elliptical gear flow meter is used for measurement; in the initial stages, the negative pressure inside the reactor caused the butadiene to vaporize, resulting in a mixture of gas and liquid, which led to inaccurate measurements； Later, the pressure inside the kettle increased and vaporization ceased; however, since the viscosity range of the flow meter is 0.6 centipoise to 2 centipoise, which is higher than the viscosity of butadiene at 0.141 centipoise (at 20°C), there is significant leakage resulting in inaccurate measurement. I would like to ask the experts: what type of flow meter is suitable for measuring butadiene?
There are several ways to measure butadiene: 1. Mass flow meter； 2. Turbine flow meter ； 3. Vortex flow meter ； 4. Throttling device ； 5. Ultrasonic waves ； 6. Rotameter.
For low-viscosity ethylene, it is recommended to use CMF series Coriolis mass flow meters; pay attention to the back pressure to prevent vaporization. Shanghai Hongke Automation Instrument Co., Ltd. has newly introduced the CMF series of Coriolis mass flow meters, which are advanced, intelligent, and highly precise instruments for measuring mass flow rate; they can also be used as density/mass concentration meters. It has the following characteristics: (1) The Coriolis mass flow meter can directly measure mass flow, regardless of changes in the temperature, pressure, density, or viscosity of the medium being measured. Most other types of mass flow meters use indirect measurement methods, that is, they first measure the volume flow rate and then determine the mass flow rate after making corrections for temperature, pressure, and density. (2) The Coriolis mass flow meter has no moving parts inside, resulting in high reliability ； Easy to install, no straight sections before or after required. (3) The Coriolis mass flow meter has high measurement accuracy, reaching ±0.1%–±0.2%R ； The range ratio is wide, reaching up to 1:100. (4) The Coriolis mass flow meter is available in split-type or integrated type, features an LCD display, is explosion-proof, and comes with a thermal insulation jacket; it can output analog signals, frequency signals, an RS485 communication interface, and Hart protocol. (5) The Coriolis mass flow meter is suitable for various liquids, such as corrosive liquids, dirty media, suspensions, and two-phase liquids (liquids containing gas)
Use a metal rotameter; viscosity has no impact, as long as there are no foreign objects blocking the rotor inside. . .
Could you please explain why it is said that for the \"CMF series Coriolis mass flow meters, pay attention to the back pressure and avoid vaporization.\" "Huh? What is the effect of being compressed and part of it vaporizing on the measurement of mass? I have practical problems that need to be verified; the flow meter is also from your company, really.
I wonder if the original poster has resolved this issue? I’ve been struggling with this too lately!
I’ve been busy with other things lately, so there’s no solution set yet for this. I’ll discuss how to address it once I meet with the personnel in charge of automation, and I’m also hoping to hear from others if they have any good suggestions or experience to share.
I want to use an electromagnetic metering pump to meter butadiene, but I don’t know what the accuracy of metering is
It is generally difficult to measure the flow rate of two-phase flow. I was wondering if it’s possible to install a filtering and degassing device in front of the helical gear flow meter?