- 學位論文
TFT-LCD廠製程冷卻水系統水錘分析及研究
An Experimental Study on Water Hammer Effects in Process Cooling Water System of a TFT-LCD Manufacturing Plant
摘要
一般管路系統防止水錘危害的方法有很多，而工程上常見用來解決水錘災害的方式，多半採用的是在管路易發生水錘壓力處安裝水錘吸收器，由於該裝置安裝雖然簡單，除須考慮初設裝置成本外，因為該裝置有壽命問題，有鑑於此，擬於管路系統最容易發生水錘處即控制閥上游處並聯一組孔口板(Orifice)，藉以用來紓解水錘突波所造成之破壞壓力，可經由孔口板釋壓，並研究管路系統流速與水錘波造成之相關影響，找出孔孔板最佳孔徑尺寸。 由於孔口板對水錘突波峰值降低確實有幫助，本研究最後建議在複雜的管路系統，為防止水錘效應發生，可搭配孔口板與釋壓閥，而孔口板至少為3mm以上才有效果，並於水錘發生處裝設孔口板及幹管上設置釋壓閥，除可降低水錘破壞力外，也可以節省設置費用及降低操作維護成本。
並列摘要
There are many methods to avoid the damage of piping systems from water hammer. Often water hammer arresters are installed, but water hammer arresters need to be replaced periodically and the cost is significant. This study proposes to use the concept orifice bypass to lessen the effects of water hammer. An experimental test model of a typical TFT-LCD process cooling piping system was setup and an orifice plate was installed at upstream side of the control valve where water hammer effects are most likely to occur. The water pressure waves due to the abrupt closure of the control valve were studied. The relationship between the water flow speed and the water waves was studied and the most suitable diameter of orifice plate was discussed. It was found that the orifice has helped to reduce water hammer wave peak value and the duration of wave excitation. It was found that orifice diameter of more than 3 mm can reduce the water hammer effects significantly. This study also experimented with the combination of orifice and relief valve to prevent damage from water hammer effects. The results of study can help to reduce the operating cost besides reducing the risk of damage from water hammer effects.