Selection of level gauges for slurry bed reactors
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For a slurry bed reactor operating at 300°C and 10 MPa, containing a nickel-based catalyst along with alcohol and water, with a height of 600 mm, what type of level gauge is suitable?
Using a high-temperature 120G high-frequency radar with quartz glass isolation flanges enables accurate measurement; AC Q: 6274240
No level gauge works well in a three-phase system of gas, liquid, and solid. This liquid level seems to indicate a pilot plant setup. For large-scale installations, radar could be considered, but precise control cannot be achieved; it can only be used as a reference. For pilot-scale operations, double flanges can be used, but only the liquid level during operation can be monitored; after the reaction starts, the density changes and the liquid level reading becomes inaccurate.
I’ve heard of this for the first time. Are there any recommended manufacturers?
You’re absolutely right. The level gauges have caused us a lot of problems; during operation, as temperature and pressure change as well as the composition of the mixture, the liquid level varies at different stages. It’s impossible for us to obtain the accurate density at each stage, which makes it difficult to make calculations. Additionally, the presence of components inside the tank means that the liquid levels aren’t uniform from top to bottom, resulting in different masses of liquid in various areas – which is very challenging
Radar has been tried; sometimes its insulation effect is poor, and liquid condenses on it, forming droplets that affect the display
Try a time-domain reflection radar level gauge; it can at least be used to measure the height of the foam after mixing, and it has been used on large tanks.