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| Design vacuum degree adjustable device based on fuzzy control in dredged sludge treatment |
| FENG Xusong1,3, XIANG Qingjiang2, JI Feng1,3, LUO Yin2 |
| 1.Jiangsu Water Source Company Ltd. of Eastern Route of South-to-North Water Diversion Project, Nanjing, Jiangsu 210029, China; 2.Jiangsu University, National Research Center of Pumps, Zhenjiang, Jiangsu 212013, China; 3.Jiangsu Pumping Station Engineering Technology Research Center, Nanjing, Jiangsu 210029, China |
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Abstract Based on frequency control of motor speed method, the jet intensity at the nozzle of jet pump was changed, and so was the vacuum degree of the device, then vacuum adjustable can be rea-lized. In this paper, MSP430F149 microcontroller was designed as base module of control system, fuzzy control was adopted to change the motor speed of centrifugal pump, vacuum adjustable test was carried out on the test rig. The test results show that the vacuum degree increased with the increasing of centrifugal pump motor speed, or increased with the flow rate of working water. For the jet vacuum device, the range of vacuum can be adjusted from 0 to 92 kPa, the control accuracy of vacuum value is less than 5 kPa, and the time to reach the set value and become the steady state is less than 25 se-conds. Fuzzy control method has the strong adaptive characteristics, and stable and reliable vacuum control can be achieved for the jet vacuum device. Compared with the valve opening method to change the device vacuum degree, frequency control of motor speed has the virtue of energy saving. The vacuum adjustable characteristic can be applicated in other vacuums such as the well-point dewatering.
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Received: 24 June 2016
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