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储气库采气工艺耦合压差发电技术应用研究
Application of gas production process of gas storage coupled with differential pressure power generation technology
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- DOI:
- 10.3969/j.issn.1001-2206.2025.06.008
- 作者:
- 赵伟, 陈浦, 周德超, 孙少华
ZHAO Wei, CHEN Pu, ZHOU Dechao, SUN Shaohua
- 作者单位:
- 中油(新疆)石油工程有限公司, 新疆克拉玛依 834000
PetroChina (Xinjiang) Petroleum Engineering Co., Ltd., Karamay 834000, China
- 关键词:
- 天然气储气库; 采气工艺耦合压差发电技术; HYSYS建模; 等熵膨胀; 等焓膨胀; 股流量控制; 单级膨胀工艺; 两级膨胀工艺
natural gas storage;gas production process coupled differential pressure power generation technology;HYSYS modeling;isentropic expansion;isenthalpic expansion;flow control;single-stage expansion process;two-stage expansion process
- 摘要:
- 以新疆油田某天然气储气库压差发电项目为例，从技术和经济角度深入探讨了采气工艺耦合压差发电技术的可行性，明确了工艺耦合的技术思路，即在集注站露点控制装置的J-T阀处并联透平膨胀机，回收天然气压力能并转换为高品位电能。采用Aspen HYSYS软件进行建模，将采气工艺耦合压差发电作为整体系统进行了模拟计算。压差发电系统将天然气分为两股，一股经透平膨胀机膨胀至5.03 MPa，另一股经J-T阀膨胀至5.03 MPa，然后将两股流汇集、混合、复热后外输。计算结果表明，在储气库实际运行工况下，单级膨胀耦合工艺和两级膨胀耦合工艺在技术上均可行，单级膨胀耦合工艺更适合储气库的实际运行工况。同时也发现在压差比一定的前提下，单级膨胀入口的天然气温度对膨胀机的输出功率具有较大影响，该温度高于20℃时膨胀机即可发电，产生的电能和冷能均可就地消纳。从经济角度来看，单级膨胀耦合工艺的财务内部收益率为8.44%，投资回收期为9.60 a，而两级膨胀耦合工艺的财务内部收益率相对较低，投资回收期相对较长，因此单级膨胀耦合工艺在经济上也更具可行性。
Taking a differential pressure power generation project for natural gas storage in Xinjiang oilfield as an example, the feasibility of the gas production process coupled with differential pressure power generation technology was further discussed from technical and economic perspectives. The technical idea of process coupling was clarified. A turbine expander was connected in parallel at the J-T valve of the dew point control device in the injection station to recover natural gas pressure energy and convert it into highgrade electric energy. Aspen HYSYS software was applied for modelling, and the gas production process coupled with differential pressure power generation was simulated as an overall system. The coupled system divides the natural gas into two streams, one expanded by a turbine expander to 5.03 MPa and the other expanded by a J-T valve to 5.03 MPa. The two streams were then pooled, mixed and reheated for export. According to the calculation results, the technical feasibility of the single-stage expansion-coupling process and the two-stage expansion-coupling process is verified under the actual operating conditions of the gas storage. The singlestage expansion-coupling process is more suitable for the actual operating conditions of gas storage. It is also recognized that under the premise of a certain differential pressure ratio, the temperature of the natural gas at the inlet of the single-stage expansion has a large influence on the power output of the expander. When the temperature is higher than 20 ℃, the expander will be able to generate power, and the generated electricity and cold energy can be locally consumed. From an economic point of view, the financial internal rate of return（FIRR） of the single-stage expansion-coupling process is 8.44%, with the payback period of 9.60 a, while that of the two-stage expansion-coupling process is lower with a longer payback period. Therefore, the single-stage expansion-coupling process is also more economically viable.