Study On The Water Quality Of Ballast Water And Energy Management Of Germicidal Device

With the entry into force of the pact on the management of ballast water,it is increasing for requirements of all countries in the world for marine environmental protection equipment.In this context,the UV/US ballast water management system is taken as the research object,we studied the correlation between turbidity,algal abundance,US and UV.Based on the analysis of the working principle of UV/US sterilization device,the following research works are focused on how to efficiently sterilize in the process of operation,and to achieve optimal control of the energy of each sterilization unit.The contents of this article are as follows:(1)Aiming at the defects of traditional single hydraulic cyclone filter in the UV/US ballast water management system.By adding a two level Y type net filter system to further reduce the turbidity of the quality of the ballast water,help to solve the technical difficulties of the UV/US combined treatment technology,ensure that the follow-up UV/US bactericidal device play an effective role,and reduce the energy consumption of the system.Therefore,the experimental platform of ballast water filtration system is built,and the experimental research on hydraulic performance of filtration system related to turbidity of water is completed.It will provide a reference for how to improve the hydraulic performance by optimizing the structure of the filter,and how to reduce the turbidity of the water quality of the ballast water and optimize the energy consumption of the system.(2)In order to achieve the energy management of UV/US ballast water sterilization plant,on the basis of analyzing the main factors affecting their working efficiency,a collaborative management strategy based on fuzzy logic control is proposed to solve the technical difficulties of UV/US joint processing technology.The change of the turbidity and algal abundance of the water quality of the ballast water is selected as the input variable of the fuzzy logic control system,and the working mode of the germicidal units in the UV/US ballast water management system is determined by fuzzy reasoning,and the design of the UV/US fuzzy controller is completed.(3)In order to verify the validity and correctness of the designed UV/US fuzzy logic control strategy.According to the weight relationship between UV and US sterilization unit in the operation of the system.In this paper,water turbidity and algal abundance are used as two input variables of the system.According to the first order reaction kinetics model of UV sterilization,the corresponding UV sterilization unit simulation model is constructed under the Matlab/Simulink software environment.Secondly,we built the UV sterilization unit experimental platform of algae inactivation,and verified the feasibility of UV/US fuzzy logic control strategy.The results show that it not only can achieve the optimal control of energy consumption,but also reduce energy consumption of UV/US sterilization device when the system meets the standard of ballast water discharge performance.(4)On the basis of the above theoretical simulation and experiment,according to the UV/US ballast water control system process and control process requirement.Based on the SIEMENS S7-300 series PLC and the distributed I/O based on the STM32 chip series,the design and development of the software/hardware in the UV/US ballast water control system are completed.Among them,this paper focuses on the application of fuzzy control strategy in PLC.Secondly,combined with the structural characteristics of WebAccess,we completed the development of remote monitoring system for ship ballast water.Finally,in order to test the accuracy of the software/hardware program,we set up the software/hardware joint debugging experimental platform,and complete the debugging work.