The use of recycled oil as an energy source presents a significant processing problem. Because the composition of the fluid is not consistent and it may also contain impurities, the use of conventional flowmeter technologies is not practical. Yokogawa’s Admag CA however, has been shown to provide reliable and stable flow measurement of recycled oil containing water.
Application
One cement producer uses recycled oil as a kiln fuel. Originally, a Coriolis mass flowmeter was tried to control the flow of recycled oil, however, measurements were unstable making reliable control impossible. The Coriolis meter’s problems were related to the separation of the oil and water as the fluid travelled the length of the meter and also the changing composition of the components (oil and water) resulted in unstable densities. In addition, it was also difficult to clean the inside of the meter.
Solution
Initially, consideration was given to applying a conventional magnetic flowmeter, however, because the oil and other residuals showed a tendency to build-up in the Coriolis meter, a similar situation was expected to occur in the magmeter, covering the electrodes with an insulating coating.
With Admag CA, the non-wetted capacitively coupled electrodes are immune to the effects of coating. In addition, the shorter length, as compared to the Coriolis meter, is better able to handle the potential layer separation of the oil and water.
The Admag CA was tested in series with the Coriolis meter under the following conditions:
The recorded output of the Coriolis meter shows large output fluctuations. The recorded output of Admag CA shows the output is stable and tracks the set-point closely (Figure 1).
Figure 1. The ADMAG CA output is stable without large output fluctuations
Notes for potential users
1. Be sure to measure the conductivity of the fluid to ensure that consistent values are obtained.
2. The water content and potential water/oil separation can affect the fluid conductivity significantly. Examine a fluid sample to determine whether a two-layer separation occurs immediately or happens gradually. If separation occurs immediately, measurement even with Admag CA may not be possible.
Admag CA
* Impervious to coating problems.
* Measures ultralow conductivity fluids to 0,01 μS/cm.
* Stable output with varying levels of oil and impurities.
* Short lay length avoids problems due to fluid separation.
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