Session: 15-13

Paper Number: 139314

139314 - Preliminary Study on the Integration of Organic Rankine Cycle With the Low-Temperature Heating Reactor 

Abstract: 

    A low-temperature heating reactor is a reactor that operates at a low temperature (usually below 200 ° C), and as the name suggests, a low-temperature heating reactor is usually used for heating. Because the low-temperature heating reactor has inherent safety for some serious accidents, and the equipment of the system is relatively simple, the construction period is relatively short, and the cost is relatively low and the economy is good, the low-temperature heating reactor has become a widely optimistic type and has broad application prospects. In addition to heating, the low-temperature heating reactor can also be used to carry out comprehensive energy utilization, such as cogeneration, but its system operating parameters are low, resulting in low thermal conversion efficiency, which limits its application potential in the field of nuclear combined power generation.

    The organic Rankine cycle (ORC) uses organic matter with a lower boiling point as a working fluid, and through the Rankine cycle, organic matter can be boiled at a lower temperature for power generation, so it is often used for the use of low temperature heat sources. Most of the research on ORC has focused on geothermal energy, industrial waste heat recovery, low temperature flue gas and other fields. However, there are few studies combining ORC with nuclear power system, and the thermodynamic performance of ORC system when used in nuclear power system needs further analysis.

    To solve these problems, this paper proposes a nuclear power supply system which combines traditional low-temperature heating reactor with organic Rankine cycle. The ORC system selects n-heptane as the working medium, which is a dry working medium with relatively high critical temperature and excellent thermodynamic properties. The cycle type is the widely studied regenerative organic Rankine cycle, the main equipment includes evaporator, expansion machine, condenser, circulation pump, regenerator. In this paper, ASPEN PLUS software is used to model the organic Rankine cycle in detail, and the thermal performance of the regenerative Rankine cycle is studied. In this study, the evaporation pressure of evaporator and condensing pressure of condenser are taken as optimization parameters, and the net output work, thermal efficiency and exergic efficiency are taken as targets for preliminary evaluation of the performance of organic Rankine cycle system applied to low temperature heating reactor, and the influence of several key parameters on the system performance is analyzed, which provides a reference for the application of ORC in power generation of low temperature nuclear heating reactor.

Presenting Author: De-En Song Tsinghua University

Presenting Author Biography: Studying at the Institute of Nuclear Energy and New Energy Technology, Tsinghua University, majoring in energy and power.

Authors:

De-En Song Tsinghua University
Wenwen Zhang Tsinghua University
Wentao Hao Tsinghua University
Weihua Li Tsinghua University
Wei Peng Tsinghua University