Design Of Control Device For Integrated System Of Desulfurization And Denitrification Of Marine Diesel Engine

With the rapid growth of the number of ships in our country,the atmospheric pollution caused by the NOx and SOx emissions from ships has become increasingly serious.In the face of ship emission problems,the integrated system of desulfurization and denitrification combined with low-temperature plasma technology and spray technology can effectively reduce the NOx and SOx emissions from the exhaust of ships.For this system,the integrated desulfurization and denitrification system control device was designed in this paper.The signal was collected by sensors,and the integrated control system for desulfurization and denitrification was implemented based on the Map interpolation correction strategy.At the same time,relevant information was displayed and recorded.The author of this article mainly completes the following work and conclusion:(1)Analyze the principle of low temperature plasma technology and spray technology,determine the factors that affect the pre-oxidation of low temperature plasma and the desulfurization and denitrification rate of the spray tower,Based on low-temperature plasma technology and spray technology,a technical solution for the integration of desulfurization and denitrification is formulated: By adjusting the voltage and frequency of the low-temperature plasma reactor,the pre-oxidation(The degree of oxidation required for the spray tower to achieve the highest removal efficiency)of the diesel exhaust gas is performed,and the exhaust gas will be oxidized when the exhaust gas is oxidized to the optimum oxidation degree.The exhaust gas is passed into the spray tower to react with the aqueous urea solution to remove NOx and SOx from the exhaust gas;(2)According to the working characteristics of the integrated system,determine the functional requirements of the control device to collect,calculate,control,alarm,record and display.Proceed from the requirements,complete the overall design of the control device;(3)Based on the functional requirements of the control device,the structural design of the control device is completed,then,the key device selection is performed.Select TMS570 microcontroller as the main control chip,and the modularization concept is used to implement the minimum system design,collection circuit design,control circuit design,and communication circuit design for the control device;(4)Using CCS6.1.2 and Visual C++ 6.0 software platform,based on the MAP interpolation-correction control strategy,complete the control device software design: including the overall process design of the program,the PC program design and the corresponding program design of the hardware modules;(5)Test the control device to verify whether the control device modules can work normally.Test content includes hardware circuit inspections,power supply tests,and functional tests.The results show that all the modules of the control device can work normally.