CO_(2)/CH_(4)混合物理论跨临界增压过程的热力性能研究  

Study on the thermal properties of CO_(2)/CH_(4) mixtures in the theoretical trans-critical pressurization process

作　　者：邵明成 潘玉贵 王增丽[1] 赵强[1] SHAO Mingcheng;PAN Yugui;WANG Zengli;ZHAO Qiang(College of Chemical Engineering,China University of Petroleum,Qingdao 266580,Shandong,China;Institute of Systems Engineering,Academy of Military Sciences,Beijing 100000,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东青岛266580 [2]军事科学院系统工程研究院,北京100000

出　　处：《化工学报》2024年第10期3742-3751,共10页CIESC Journal

基　　金：国家自然科学基金项目(52376020,52176029);自主创新科研计划项目(23CX07007A)。

摘　　要：伴生气增压回注驱油是油气开采中实现碳减排的重要措施,但伴生气主成分为CO_(2)/CH_(4)混合物,组分波动剧烈,且CO_(2)在临界点附近性质极不稳定,这对注气压缩机的稳定性提出了严峻挑战。为厘清CO_(2)/CH_(4)混合物跨临界增压特性,构建了混合物物性PR方程,计算了混合物物性及相态变化规律,明确了安全增压路径。据此构建了CO_(2)/CH_(4)混合物理论跨临界增压热力学模型,得到了混合物跨临界增压过程p-V图、阀片运动规律及指示功率,并对比分析了组分浓度对物性特征及压缩机热力性能的影响机理。研究结果表明:随着CO_(2)浓度升高,饱和气相线向高温区移动,临界温度升高,增压过程中进排气压力损失增大,CO_(2)浓度从20%增加到100%过程中压缩机功耗降低22.93%。相关研究结果可为CO_(2)/CH_(4)混合物跨临界增压压缩机的设计和可靠运行提供理论依据。Associated gas booster reinjection flooding is an important measure to achieve carbon emission reduction in oil and gas exploitation,but the associated gas is a CO_(2)/CH_(4) mixture,the composition fluctuates violently,and the properties of CO_(2)near the critical point are extremely unstable,which poses a severe challenge to the stability of the gas injection compressor.In order to clarify the trans-critical pressurization characteristics of CO_(2)/CH_(4) mixture,the PR equation of the physical properties of the mixture was constructed,the physical properties and phase changes of the mixture were calculated,and the safe pressurization path was clarified.Based on this,the theoretical trans-critical pressurization thermodynamic model of CO_(2)/CH_(4) mixture was constructed,and the p-V diagram,valve movement law and indication power of the mixture trans-critical pressurization process were obtained,and the influence mechanism of component concentration on physical properties and thermal performance of the compressor was compared and analyzed.The results show that with the increase of CO_(2)concentration,the saturated gas phase moves to the high temperature region,the critical temperature increases,the inlet and exhaust pressure loss increases during the pressurization process,and the compressor power consumption decreases by 22.93%when the CO_(2)concentration increases from 20%to 100%.The relevant research results can provide a theoretical basis for the design and reliable operation of the trans-critical supercharging compressor of CO_(2)/CH_(4) mixture.

关 键 词：超临界二氧化碳 注气压缩机 跨临界增压 数学模型 增压模拟 

分 类 号：TH45[机械工程—机械制造及自动化]