Research On Waste Heat Utilization Of Ship Cylinder Water Based On Heat Pipe And Thermoelectric Generator

Ship is a huge energy consumption.With the continuous development of the shipping industry,the energy consumption of the shipping is increasing year by year,which has aggravated the global environmental deterioration and energy crisis and endangered the survival of mankind.So the International Maritime Organization(IMO)put forward more stringent technical requirements on ship energy saving and emission reduction.The new implementation of ship energy efficiency design index(EEDI)limits the energy consumption of the ship by reducing the carbon emissions.Therefore,it is necessary to study the problem of ship energy efficiency and to excavate the waste heat energy of the ship.Thermoelectric power generation technology can directly convert thermal energy into electrical energy by use of thermoelectric materials,with the advantages of no moving parts,simple structure,long service life,environmentally friendly and so on.It has played an important role on utilization of waste heat.In this paper,based on the principle of thermoelectric generation and flat plate heat pipe technology,the waste heat utilization of marine diesel engine cylinder water was investigated.The primary work is summarized as follows:(1)According to parameters of cylinder water of Wartsila 4L20 marine diesel engine,a thermoelectric generation system was designed based on flat plat heat pipe technology.(2)Based on the designed system,the performance parameters of the thermoelectric power generation system are calculated,including the output power and thermoelectric efficiency.The relationship is studied between the number of the thermoelectric generator,heat sink temperature,flow of hot fluid and the maximum output power of system,thermoelectric efficiency.(3)The experiment platform of thermoelectric generation system is built,to research the relationship between power output,thermoelectric efficiency and flow of hot fluid,heat sink temperature,load resistance.Compared the results with theoretical value.The following conclusions can be drawn from the above research:(1)When the number of thermoelectric generator increased from 4 to 16,the maximum output power became 2.32 times to the original value.In terms of structure and cost,increasing the number of thermoelectric generator in the module id more favorable.(2)When flow of hot fluid increased from 5L/min to 9L/min,each additional 1L/min,system output power increased 1.3%.While the heat sink temperature increased from 25 ? to 40?,each additional 3 ?,the system output power decreased by 10%.The latter changes more obviously than the former,indicating that the difference in temperature is the main factors affecting the output performance of thermoelectric system;(3)For thermoelectric power generation designed in this paper based on flat plat heat pipe,the maximum output power is 27.68W and the corresponding thermoelectric efficiency is 3.98%when the heat sink temperature is 25?,the average inlet temperature of heat collector is 88.42 ? and the flow of hot fluid is 9L/min.(4)If recover waste heat of cylinder water of Wartsila 4L20 marine diesel engine according to the performance of thermoelectric power generation system designed in this paper,the maximum output power is up to 6965W.