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| A baseline was established at current operating conditions by carrying out two Diagnostics™ Scans ¡ª one active area and one through the centre downcomers. The active area scan did not reveal anything remarkable about the tray hydraulics. The tray active areas held reasonable levels of liquid and their vapour spaces were relatively clear. However, the centre downcomer scan showed a very interesting phenomenon. The top centre downcomer, below Tray 39, looked normal. But the data showed that the rest of the centre downcomers had a layer of more dense, less aerated liquid suspended in the middle rather than at the bottom of the downcomer. In addition, the scan showed that there was some frothing material above these centre downcomers. Remarkably, it appeared that vapour was bypassing through the centre downcomers as there was no liquid seal at the bottom of these. Apparently this vapour bypass was enough of a separation efficiency loss to cause the slightly off-specification overhead flow. |
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