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4. The removal of ammonia-nitrogen from aquaculture water based on cavitation effect of ultrasonic vibration.

Author

Guo Fuyu, She Jianguo, and Chen Ning

Subjects
*ULTRASONIC effects, *CAVITATION, *OXYGEN in water, *AQUACULTURE, *WATER temperature, *SEWAGE purification
Abstract

This paper mainly studies the mechanism and efficiency of ammonia-nitrogen removal from circulating sewage in closed fish tank system. According to some factors affecting the removal efficiency (ultrasonic power, ultrasonic time and water oxygen concentration). Simulated circulating sewage mixed with oxygen through a venturi tube and then entered a closed experiment box for ultrasonic experiments. Finally, the removal efficiency was determined by Knott's reagent photometry. In the experiment, the PH value of the simulated sewage was 7.5, the indoor water temperature was 20 °C, and the free ammonia was selected as 0.02 mg/L (total ammonia-nitrogen was 1.6 mg/L) according to the standard. The experiment found that when the ultrasonic power is 400 W, the action time is 2 h, and the oxygen concentration of water is 23.8 mg/L, the efficiency of removing ammonia-nitrogen in water is about 65 %. When applied on fishing vessels, increasing the power can increase the removal efficiency. [ABSTRACT FROM AUTHOR]

Published
2023
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5. Finite element analysis of gear of full-rotating propeller steering assembly

Author

Wu, Qiupeng, She, Jianguo, Chen, Ning, Wu, Qiupeng, She, Jianguo, and Chen, Ning

Abstract

In order to ensure that the gear of the steering component of the full-rotation propeller meets the limit of bearing capacity and normal use under the action of moment load, this paper takes a steering propeller device as the research object, establishes the finite element model of the gear of the steering component under normal and braking conditions, carries out stress bending strength analysis, and carries out modal analysis. It is verified that the gear of the steering assembly meets the safety requirements, which provides a reference for the design of the steering device.

Published
2022

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