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jianing116金虫 (文学泰斗)
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| A baseline was established at current operating conditions by carrying out two Diagnostics™ Scans — 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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petrocatal
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jianing116(金币+60, 翻译EPI+1):哥，你太强大了~ 2010-10-30 20:39:23
| 通过Diagnostics™两种扫描——有效区域与降液管穿行有效区域扫描，可以建立在当前操作条件的正常操作基线。有效区域扫描并不能曝露出塔盘水力学的重要信息。塔盘的有效区域拥有合理的持液量，并且气液分割清晰。然而，中央降液管的扫描暴露出一个非常有趣的问题。塔顶39层之下的中心降液管正常运行。这些数据显示，与塔底的降液管相比，其余的中心降液管中存在浓稠的、低充气率的液体。此外，扫描还显示这些降液管的中心存在一些发泡物质。值得注意的是，由于降液管的底部没有被液封，气相从降液管中心迂回通过。明显地，气流的迂回穿行将会导致塔顶产品偏离质量规格。 |
2楼2010-10-30 18:50:06
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