Research And Prototype Design Of Ship Exhaust Heat Recovery Based On Thermoelectric Generation And Heat Pipe

As an important transportation vehicle in international trade,the vessel consume a huge energy.About 25%of the energy produced by the combustion of diesel fuel from the ship is taken away by flue gas,leading to the energy waste.In such case,it is important to study on recovery of the ship exhaust heat.The thermoelectric power generation(TEG)technology can directly convert the thermal energy into electric energy,which can effectively reduce the ship energy consumption,as well as the carbon emission.The thermoelectric power generation has the characteristics of simple structure,no pollution and easy maintenance.Therefore,it shows vast research and application prospect in the field of exhaust heat recovery of the ship.In this paper,based on the thermoelectric power generation technology and the enhanced heat transfer performance of the heat pipe,a thermoelectric power generation experimental facility was designed and built,which used heat pipe to enhance heat transfer.After the related theoretical calculation and experimental study were finished,a system equipped with thermoelectric power generation and heat pipe was proposed,which could recover the ship exhaust heat to generate electricity.The primary works are summarized as follows:Firstly,’ a lab-scale of experiment facility of the heat pipe associated with thermoelectric power generation was designed,to investigate the heat-transfer characteristics.The thermal conductivities of heat-transfer process of experimental facility were calculated.According to the thermodynamic model of the thermoelectric power generation system,the theoretical values of output performance of experimental facility were calculated,and compared with the experimental values to confirm the feasibility of the experiment facility and the rationality of the structure.Secondly,the thermoelectric power generation experiment platform was built.The optimal operation modes of the experimental platform were investigated experimentally,and the performance of the thermoelectric power generation experimental facility under different working conditions was analyzed.The maximum output power of the thermoelectric power generation experimental facility were 39.42 W,47.22 W,and 53.25 W.The corresponding thermoelectric conversion efficiency were 4.8%,5.2%,and 5.5%,respectively,under conditions of the heat source temperature of 275℃,300℃,and 325℃.Thirdly,the output performance of the thermoelectric power generation experimental facility under different heat transfer modes of both cold side and hot side were compared.Results showed that heat pipe used on the cold side or heat side could enhance heat transfer,thus improving the output performance of the thermoelectric power generation experimental facility.Finally,according to the relevant parameters of the MAN 6S70MC marine diesel engine of vessel "SDM",the exhaust heat of this ship was calculated.Then,a system equipped with thermoelectric power generation and heat pipe was designed.The system was composed of several thermoelectric power generation units.Each unite installed 384 pieces of thermoelectric generating module.According to the quantity of exhaust heat,amount of the thermoelectric power generation units could be flexibly controlled.One thermoelectric power generation unit can generate 3.4 kW electric energy under condition of the exhausts temperature of 325 ℃.