<p>The economical and feasible sonochemical device is of vital significance in the industrial treatment of oily sludge. In this work, sono-reactors optimization design is achieved through the use of computer simulations and acoustic pressure maps, and the effect of transducer position, transducer number and layout, ultrasonic frequency, ultrasound power, and geometric dimension of sono-reactors on acoustic pressure distribution characteristics is investigated. The parametric study results indicate that the spatial distribution of acoustic pressure is greatly affected by transducer position, transducer number, ultrasonic frequency, and geometric dimension of sono-reactors. Besides, the distribution of acoustic pressure is nearly not affected by ultrasound power, whereas its value is positively affected by ultrasound power. The installed transducer position is very important, and improper installation may cause interference of sound wave, resulting in energy loss and reducing the cavitation intensity. Based on the mapped acoustic field, a bath-type reactor of 200&#xa0;mm × 100&#xa0;mm × 100&#xa0;mm (Length × Width × Height) is designed with a bottom inclination angle of 25 °, and is equipped with 4 ultrasonic transducers of 28&#xa0;kHz and 200&#xa0;W, and its oil removal rate from oily sludge reaches 57.48%. The reliability and rationality of the numerical simulation results in this paper are verified from the two aspects of the actual-measured acoustic pressure at typical positions and the actual oil-removal performance of oil-based drilling cuttings. The results of this study provide a technical reference and theoretical basis for clarifying the distribution mechanism of ultrasonic waves, optimizing the structural design and improving oil-removal of oily-sludge sono-reactor.</p>

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Simulation of Local Ultrasonic Intensity and Optimization of Sono-Reactors Geometry for Oily Sludge Treatment

  • Chenyang Li,
  • Yimin Sang,
  • Dading Zhang,
  • Duan Zhao,
  • Bengao Li,
  • Dekun Ji,
  • Ling Zhu,
  • Yanhe Han

摘要

The economical and feasible sonochemical device is of vital significance in the industrial treatment of oily sludge. In this work, sono-reactors optimization design is achieved through the use of computer simulations and acoustic pressure maps, and the effect of transducer position, transducer number and layout, ultrasonic frequency, ultrasound power, and geometric dimension of sono-reactors on acoustic pressure distribution characteristics is investigated. The parametric study results indicate that the spatial distribution of acoustic pressure is greatly affected by transducer position, transducer number, ultrasonic frequency, and geometric dimension of sono-reactors. Besides, the distribution of acoustic pressure is nearly not affected by ultrasound power, whereas its value is positively affected by ultrasound power. The installed transducer position is very important, and improper installation may cause interference of sound wave, resulting in energy loss and reducing the cavitation intensity. Based on the mapped acoustic field, a bath-type reactor of 200 mm × 100 mm × 100 mm (Length × Width × Height) is designed with a bottom inclination angle of 25 °, and is equipped with 4 ultrasonic transducers of 28 kHz and 200 W, and its oil removal rate from oily sludge reaches 57.48%. The reliability and rationality of the numerical simulation results in this paper are verified from the two aspects of the actual-measured acoustic pressure at typical positions and the actual oil-removal performance of oil-based drilling cuttings. The results of this study provide a technical reference and theoretical basis for clarifying the distribution mechanism of ultrasonic waves, optimizing the structural design and improving oil-removal of oily-sludge sono-reactor.