Study on a new cascade utilize method for ship waste heat based on TEG‐ORC combined cycle

Abstract

AbstractIn order to achieve the efficient cascade utilization of various ship's waste heat, improve the energy efficiency of ships and meet the strict requirements of the new international carbon emission regulations, this article proposes a of TEG‐ORC (thermoelectric power generation/organic Rankine cycle) combined cycle, and designs the experimental system. Coupling characteristics of each bottom cycle are taken as the entry point in the combined cycle, using the method of system simulation, the influence of TEG/ORC bottom cycle ratio, evaporation pressure and flow rate of ORC working fluid flow on the key performance of system output power, system thermal efficiency, and waste heat utilization rate of main engine flue gas are studied. The results show that TEG‐ORC combined cycle can overcome the limitations of TEG or ORC, maximize the recovery amount of waste heat, improve the stability and safety of ORC bottom cycle, simulation results show that when the bottom cycle ratio (QTEG/QORC) is 0.52, the maximum output power and maximum thermal efficiency of the experimental system are 2933.7w and 24.68%, respectively. In this condition, the scale of TEG bottom cycle is 41 pieces, the ORC working fluid flow rate is 0.046 kg/s, and the ORC working medium evaporation pressure is 3 MPa.