tailieunhanh - Dust Explosions in the Process Industries Second Edition phần 9

Nồng độ bụi mong muốn được mua lại bởi kiểm soát độc lập của dòng không khí thông qua ống (hút fan hâm mộ ở cuối hạ lưu của hệ thống), và tỷ lệ cho ăn bụi vào dòng chảy không khí. Bụi bị mắc kẹt trong cơn bão giảm 0,15 m3 buồng bụi thu thập bắt vít ổ cắm phía dưới. | Assessment of ignitability 519 a LOW-VOLTAGE CAPACITOR DISCHARGED THROUGH TRANSFORMER ORIGINAL US BUREAU OF MINES CIRCUIT b DIRECT DISCHARGE OF HIGH-VOLTAGE CAPACITOR WITHOUT AND WITH INDUCTANCE cl CMI-DISCHARGE CIRCUIT Figure Three different electric spark discharge circuits used for determining the minimum ignition energy of dust clouds ing the discharge with the dust cloud may be appreciable. Sophisticated elements such as thyrathrons have been employed to solve this problem. However synchronization of spark and dust cloud can also be accomplished by incorporating a third auxiliary spark electrode in the spark gap configuration. By discharging just a very small energy in the gap between one of the main electrodes and the auxiliary electrode the main discharge is initiated. This method was used with success by Franke 1978 . Mechanical synchronization constitutes a further possibility. Prior to the experiment the capacitor is then charged to the high voltage required with the spark gap sufficiently long for breakdown to be impossible at that voltage. Pneumatically or spring-driven displacement of one of the spark electrodes towards a shorter spark gap allowing spark-over is synchronized with the occurrence of the transient dust cloud for example via solenoids. Boyle and Llewellyn 1950 were probably amongst the first to use the electrode 520 Dust Explosions in the Process Industries displacement method. Its drawback is that the actual spark gap distance at the moment of the discharge is not known. One way of avoiding the synchronization problem is to work with a semi-stationary dust cloud and charge the high-voltage capacitor slowly until breakdown occurs naturally at the fixed spark gap distance chosen. Because of arbitrary variations the actual voltage at breakdown will differ from trial to trial and must be recorded for each experiment for obtaining the actual given spark energy 1 2 cv2. Figure b illustrates two versions of the direct high-voltage .

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