| The sustainable development has become a common problem in the world.At present,oil crisis continued to intensify,energy supply is becoming increasingly tense,the continued deterioration of the ecological environment,under the situation of global energy supply is becoming increasingly tight,all the countries in the world are actively exploring the energy supply security strategy and have increased energy-saving emission reduction technology research to improve the efficiency of energy use. Specific to the shipping industry,it is the ship energy conservation has become an important research subject of the world shipbuilding industry and shipping industry.In this context,this paper designed a waste heat recovery system for the recovery of LNG/diesel dual fuel engine cylinder liner water waste heat.In theory,the research on the waste heat recovery system has been carried out,and provided the relevant design and calculation basis for the key components of the waste heat recovery assistance systems(such as heat exchangers and gasification, etc.).In this paper,a control system was designed according to different conditions of water temperature of LNG/diesel dual fuel engine cylinder liner,and used Fuzzy-PID based on PLC to control LNG/diesel dual fuel ship engine cylinder water temperature.This system allows hot water heat exchanger of the engine cylinder,and pre-heating the recovered waste heat for the engine fuel.At the same time,this system allows the engine cylinder water temperature reaches the optimum cooling temperature of LNG/diesel dual fuel engine cylinder vessel.A fuzzy controller was designed for the inlet temperature changes of LNG/diesel dual fuel ship engine cylinder,and made simulation comparison of conventional PID and Fuzzy-PID for jacket water temperature change.The simulation results indicated that fuzzy-PID control with shorter response time, lower overshoot,higher steady-state accuracy,better dynamic and static performance than traditional PID control.The experimental platform of LNG/diesel dual fuel engine waste heat recovery was designed and built finally,Fuzzy-PID control based on PLC was used by significant temperature of simulation platform. Using data acquisition card to measure the changing process of key temperature and making comparison between experimental results and theoretical results. The results showed that the entire experimental system could realize thestable operation and these results are basically consistent. |
