Which level gauge for the reaction tank?
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If measuring the liquid level in a reaction tank that has stirring, and the medium inside is constantly being replaced which causes its density to change continuously, are there any level gauges that are relatively inexpensive yet accurate, other than radar and ultrasonic ones? Moreover, the reaction tank goes through the floor slab, so I think magnetic flap valves are not suitable either. Please ask the experts for some advice!
Make an opening in the outlet pipe of the reactor, and use an insert-type flange level transmitter for measurement
It is recommended to use a differential pressure transmitter to measure the liquid level of the product at the outlet; alarm values can be set on the DCS or PLC to measure the static liquid level, which will provide more accurate results. :lol
To those upstairs, if the density of the medium in the tank is changing, and moreover changing significantly, it is not very accurate to use pressure measurement to determine the liquid level.
How tall is the reaction vessel? You can try an internal floating ball
It is recommended to use a capacitive level transmitter for external measurement. This type of transmitter is independent of the medium density.
It also depends crucially on the viscosity and melting point of your medium, as well as whether it crystallizes easily. If the viscosity is not high, the melting point is not low, and crystallization does not occur, a capacitive level gauge can be used, installed on the side!
It can also be measured using a gamma-ray level gauge :)
Based on what you’ve described, only radar and ultrasound can be used; other measurement methods are unstable
In fact, there are many options for selecting level gauges. 1. For detecting the oil-water interface, options include radioactive level gauges, double-flange types, radio frequency admittance gauges, magnetostrictive gauges, guided wave radar, and servo-type level gauges. 2. For applications with foam, the following can be used: radioometric level gauges, double flange types, magnetic flip plates, float level gauges, etc
It is normal for the density of the material in the reaction vessel to change continuously during the production process. Once heating, cooling, stirring, and the reaction are complete, the density of the product should be constant, unless the density varies depending on the batch of products. I believe that when choosing a level gauge for a reactor, one should not give too much consideration to density issues. However, it is essential to keep the liquid level in the reactor below the safe level – for example, at 75% of the capacity. Since most reactors are pressure vessels, it is crucial to maintain the liquid level strictly within the safe range. After that, the highest allowable liquid level can be determined by considering the minimum density of all the products produced, thereby ensuring safe operational conditions. It is recommended to use a dual-flange diaphragm-type pressure-transmitting capillary differential pressure level gauge, which is the most suitable for the operating conditions of your reaction vessels. For reference only!
After some thought, given the extremely harsh operating conditions described by the poster, it’s really difficult to find a suitable product for measuring liquid levels other than those that use radar or ultrasonic technology; let alone something that is more affordable.
1. Since there is a stirrer inside the reaction vessel, instruments cannot be inserted into it. 2. Because the density changes frequently, it is not possible to use pressure principles for measurement. In light of this, I believe that only radiation, radar, and ultrasound can be used. When using radar and ultrasound, it is also necessary to take into account whether steam is evaporating inside the reaction vessel; if so, whether it condenses on the top of the vessel, as this can affect the measurement results