Selection of flow meters for the three materials entering the urea synthesis tower
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The metering of the three feed materials for the urea synthesis tower in our plant – liquid ammonia, CO2, and dimethylamine – is currently inaccurate, resulting in numerous problems. The flow meters used include high-pressure orifice plates and balanced types. The pressure transduction tubes for CO2 tend to crystallize, resulting in large fluctuations; similar large fluctuations occur with liquid ammonia, making the data of no use. For methylamine, balanced flow meters are used, but taking pressure readings via high-pressure flanges presents problems, as does the insulation of the pressure transduction tubes. I was wondering which company has relatively stable measurement of these three types of materials with low errors; I plan to go and take a look.
For CO2, a thermal mass flow meter is used; for liquid ammonia, an electromagnetic flow meter is employed; and for methylamine, an insert-type target flow meter is used – in all cases, there are no issues related to heat preservation
There shouldn’t be any problems with high pressure, as the pressure is already close to 20 MPa @zheng8318