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Proposal and analysis of a coupled power generation system for natural gas pressure reduction stations

一种用于天然气降压站的耦合式发电系统的提出与分析

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Abstract

With the increased use of natural gas, it is valuable to study energy recovery ratio in the natural gas pressure reduction stations (PRSs). This paper focused on recovering the energy in PRSs as well as low-grade waste heat by a coupled power generation system (CPGS). The CPGS integrates a natural gas expansion (NGE) subsystem and an organic Rankine cycle (ORC) subsystem driven by low-temperature waste heat. Firstly, a comparative analysis is carried out between the separated natural gas expansion system and the separated ORC system. Then, the effects of heat source conditions, upstream pressure of natural gas and the isentropic efficiency of the natural gas expander are investigated. At last, working fluids selection is conducted with respect to two different pressure ranges of natural gas. The results show that there is an optimal temperature and mass flow rate of the heat source that maximizes the system exergy efficiency. With the increase of the upstream pressure of natural gas, the net power output and waste heat recovery factor increase while the system exergy efficiency has an optimal point. Furthermore, the isentropic efficiency of the natural gas expander has a great influence on the net power output of the system.

摘要

随着天然气的用量增加,提高天然气降压站的能量回收率势在必行。本文通过一种耦合式发电 系统(CPGS),回收降压站的余能以及低品位废热。CPGS 集成了天然气膨胀子系统和低温废热驱动的 有机朗肯循环子系统。首先,将CPGS 与独立的天然气膨胀系统和ORC 系统进行比较分析;其次, 探究了热源条件、天然气上游压力和膨胀机等熵效率等因素的影响;最后,针对于两种不同的压力范 围进行工质选择。结果表明,在不同的热源温度和流量下,系统火用效率存在最优值。随着上游天然气 压力的增加,系统净输出功和废热利用率增加,而系统火用效率存在最优点。此外,天然气膨胀机的等 熵效率对系统输出功有明显影响。

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Authors and Affiliations

  1. School of Energy Science and Engineering, Central South University, Changsha, 410083, China

    Cheng-hao Li  (李铖灏), Si-yang Zheng  (郑思洋), Xing-yu Chen  (陈星宇), Jie Li  (李洁) & Zhi-yong Zeng  (曾志勇)

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  1. Cheng-hao Li  (李铖灏)
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  2. Si-yang Zheng  (郑思洋)
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Correspondence to Zhi-yong Zeng  (曾志勇).

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Foundation item: Project(21506257) supported by the National Natural Science Foundation of China; Project(2019zzts535) supported by the Fundamental Research Funds for the Central Universities, China

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Li, Ch., Zheng, Sy., Chen, Xy. et al. Proposal and analysis of a coupled power generation system for natural gas pressure reduction stations. J. Cent. South Univ. 27, 608–620 (2020). https://doi.org/10.1007/s11771-020-4320-3

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