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Ventilator widely used in power plants, metallurgy, mining, subway and tunnel industry, especially in the mining industry, the fan is a high-power, long continuous running equipment, with the development of science and technology, the fan in the performance and operation of the safety and reliability have been greatly improved, but it still has some shortcomings, such as prone to surge, especially the surge fan hazards, ranging from the fan downtime, interruption of production, resulting in economic loss; weight is caused by the destruction of equipment and even causing casualties. In order to guarantee the normal operation of the fan, must be equipped with a control system to prevent the occurrence of surge. The centrifugal fan antisurge generally imitate the compressor, the minimum flow method, can not fully make the fan work area in the best conditions, premature starter anti-surge system, a waste of energy; and control systems generally use analog gauges which changes in ventilator surge line can not be corrected, a better implementation of nonlinear surge line can not control. Recently, with the development of computer technology, the control method has been further improved but most of the anti-surge control pressure and speed is simply described as a linear relationship, and some even adjust the air pressure to achieve the anti-surge control and thus make the system dynamic performance is poor, can not accurately determine the status of the surge can not timely action to reduce fan efficiency while exacerbating system wear and tear. To solve the above problem, this paper Petrochemical College of Laboratory centrifugal fan control system as the research object, using a combination of theoretical and practical research methods, control strategy to prevent the surge occurred centrifugal fan, and the simulation and experimental research. Increase in order to better reflect the work of the centrifugal fan, and the import and export of pressure, flow, temperature measurement based on the measurement of vibration and noise signal using the configuration software, better human-computer interaction. by experiment, it is determined that the ventilators to the surge line. On this basis, a theoretical study, the proposed integrated control strategy of pressure and speed closed-loop control, using MATLAB Simulink software simulation theory to fan anti-surge test, the test results show that the improved antisurge quality, well to achieve the the expected the antisurge effect of.
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