Research of long period operation characteristics of supercritical CO2/propane mixture brayton cycle
Year: 2025
Type: conference-paper
Abstract: The use of a CO2-based binary mixture with high critical temperature is a potent way to enhance the supercritical CO2 Brayton cycle performance under a high-temperature environment. The mixtures’ thermal stability at high temperatures significantly affects the Brayton cycle performance. Consequently, investigating the thermostability of CO2-based binary mixture is of great importance. In the paper, the thermal decomposition process and main thermal decomposition products of the CO2/propane mixture are studied by using ReaxFF. The component models of a 10 MW power plant are established to research the Brayton cycle performance over various operating years after the thermal decomposition of the CO2/propane mixture. It demonstrates the CO2/propane mixture decomposition rate rises upon the growth of cycle operating years, leading to changes in its critical parameters and compressor power consumption. The decrease in thermal power supplied to the intermediate heat exchanger triggers a drop in cycle thermal efficiency. The cycle performance degradation can be mitigated by optimizing the shaft speed of the cycle. Besides, with the rise in ambient temperature, the cycle performance will also decrease.
Authors: Longwei Zhang, Hao Qiu, Kuihua Han, Xiaojian Zhang, Shilong Wang, Zhiqiang Bao, Xurong Wang, Jianhui Qi
Institutions: Shandong University, Henan University of Urban Construction
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4409505216