Research on Transient Response Character Analysis of ORC Waste Heat Recovery System for Marine Diesel Engine

orc2019 Tracking Number 212

Nowadays, maintaining the wholesomeness of the oceans, protectingthe marine environment have become common norms for all the people in the world to abide by, and a collective mission for all mankind to undertake. The EEDI and EEOI index had already been stated by IMO and phased on due course so as to reduce the CO2 emission. Decreasing the emission from Marine diesel engine as the main power of the civil ships is the main key to achieve the purpose of reducing pollution. Organic Rankine Cycle, which have been proved to be one of the most efficient low temperature waste heat recycle system for power generation by now, can utilize the xhausted gas from diesel engine to drive the power generator and thus lower the EEDI along with increasing the fuel efficiency. However, the steady output of the ORC waste heat recycle system have long been disturbed by the unstable working condition of diesel engine coursed by the mutable sailing environment. This thesis had investigated the heat sources character of different type of diesel engine and their several working conditions, therefore, established the system model of ORC waste heat recovery system for marine diesel engine and researched the working condition of the cycle system which influenced by internal and external disturb. Then, the thesis worked on the transient response character effected by factors such as thermal inertia、evaporating pressure、evaporating temperature at multi time scale. Results how: the higher the load of the diesel engine, the more stable of the energy generated; the larger the thermal inertia, the dully system response. Eventually, with various system response character summarized, the thesis provides support data for the control system to improve the adaptability of the ORC waste heat recycle system applying to the vessel.