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| Surge mechanism of centrifugal blower in WWTP |
| Hu Jian1， Cai Lan1， Liu Meng2 |
| (1.School of Mechanical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China； 2.Zhenjiang Water Industry Company, Zhenjiang, Jiangsu 212002, China） |
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Abstract In order to ensure centrifugal blower safe running in WWTP and prevent surge in operation, in view of centrifugal blower characteristics and present research status, factors producing surge in WWTP were analyzed, reasons causing surge and measures preventing surge were studied. Considering from process design, different formula commonly used were compared and the appropriate oxygen requirement formula in technique design was obtained. Taking a sewage treatment plant with 1 phase of project as the example, according to the performance curves from factories and the testing results on spot, new surge flux of control point was calculated and an accurate air supply was identified. By changing operating procedure when switching blower, the clogging in aeration plate holes was decreased, the blower discharge resistance was reduced, which leads to blower running point deviating from the surge point. Thus, blower discharge resistance is down 5 kPa and the regeneration period of aeration plate is up 1 year. Placing an inducer in front of the blower can adjust the air inflowing angle in small flux. It changes the blower characteristicsand expands the blower regulation scope. The test results indicate that when flux control to 60%, the efficiency drops gently.
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Received: 31 December 2010
Published: 30 March 2011
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