面向船舶多种余热梯级利用的TEG-ORC联合循环性能

传统的温差发电（TEG）和有机朗肯循环（ORC）等技术难以兼顾船舶多种性质余热的不同特点，且利用率较低。本文提出了一种TEG-ORC联合循环船舶余热梯级利用系统，研究了ORC底循环蒸发压力变化对系统输出功率、热效率、多级余热利用量和成本等重要性能的影响。结果表明，TEG-ORC联合循环实现了发电成本和热效率的优化，在TEG/ORC底循环比为0.615的工况下，主机烟气余热利用率随ORC蒸发压力的增加在小区间波动，系统的余热利用功率、输出功率和热效率均随ORC蒸发压力的增加而增大，系统单位发电成本随ORC蒸发压力的增加而降低。在ORC蒸发压力达到0.9 MPa时，主机烟气余热利用率为62.15%，余热利用功率为1919.68 W，输出功率为139.22 W，热效率为7.25%，单位发电成本为3.09 ￥·(kW·h)–1。 

TEG-ORC combined cycle performance for cascade recovery of various types of waste heat from vessels

High energy consumption and low energy efficiency are problems that have plagued vessels in operation for many years. Traditional technologies such as thermoelectric generator (TEG) and organic Rankine cycle (ORC) are difficult to take into account the different characteristics to various waste heat of vessels. Simultaneously, the utilization rate of vessel waste heat is relatively low. To achieve the purpose of various types of waste heat from vessels, this study presents a vessel waste heat cascade utilization device system, which is based on the TEG-ORC combined cycle. The effects of the ORC evaporation pressure on the performance of the system were analyzed, which includes the combined cycle system output power, system thermal efficiency, multi-stage waste heat utilization and power generation cost of the system. The results show that the TEG-ORC combined cycle system improves the waste heat utilization performance and the combined cycle enables the optimization of power generation cost and system thermal efficiency. Based on the condition that the TEG-ORC basic cycle ratio of 0.615, the utilization rate of flue gas waste heat generated by the main engine, fluctuates in a small interval with the increase of ORC evaporation pressure. The waste heat utilization power of each unit, output power and thermal efficiency of the system enhance with the increase in the ORC evaporation pressure. At the same time, the unit power generation cost of the system decreases with the increase in the ORC evaporation pressure. When the ORC evaporation pressure reaches 0.9 MPa, the waste heat utilization rate of the flue gas generated by the main engine is 62.15%, the waste heat utilization power of the system is 1919.68 W, the output power of the system is 139.22 W, the thermal efficiency of the system is 7.25%, and the cost of system unit power generation is 3.09 ￥·(kW·h)–1.