掺氢对天然气管道水热特性及其与压缩机联合运行影响规律研究  

Investigation on Impact of Hydrogen Blending on the Thermohydraulic Characteristics of Natural Gas Pipelines and Its Combined Operation with Compressors

作　　者：欧阳欣 王嘉康 程磊 彭世垚 王志恒[2] 王金华 Xin Ou-yang;Jia-kang Wang;Lei Cheng;Shi-yao Peng;Zhi-heng Wang;Jin-hua Wang(Science and Technology Research Institute,National Oil and Natural Gas Pipeline Network Group Company Limited;School of Energy and Power Engineering,Xi'an Jiao Tong University)

机构地区：[1]国家石油天然气管网集团有限公司科学技术研究总院分公司 [2]西安交通大学能源与动力工程学院

出　　处：《风机技术》2025年第1期1-10,共10页Chinese Journal of Turbomachinery

基　　金：国家管网集团项目-在役天然气管道掺氢输送关键技术研究(编号:DTXNY202203)。

摘　　要：掺氢天然气管道输送中,气质条件的变化会对管道和压缩机的运行特性产生较大影响。为此,本文开展掺氢对天然气管道水热特性影响规律研究,通过构建管输水热特性温度-压力耦合求解模型以及考虑掺氢天然气等熵指数变化的离心压缩机性能相似理论求解模型,分析了掺氢对管输水热特性以及管网-压缩机联合运行的影响规律。研究结果表明,与无氢天然气相比,掺氢天然气可以降低管道摩擦阻力,管道体积流量最大可提升14.73%,而输气功率与其趋势相反。在假设进口压力以及能量流量恒定的条件下,随着掺氢比的增大,压降有所增加,温降有所减小。相比于高压长距输气管道,掺氢对中压长距离输气管道出口压力的影响更小。平均温度下,30%掺氢比的中压管线出口压力相较于0%掺氢比下降13.75%,低于高压管线的15.35%。随着掺氢比的增加,离心压缩机流量-压比曲线逐渐向着低压比的方向移动。在与管网联合运行时,随着掺氢比的增大,联合运行工作点向压力、流量减小的方向移动,最终导致输气量的降低。为保持压缩机能量流量恒定,高压管网掺氢比应控制在7.09%以下;为保证可以达到30%掺氢比工况要求,高压压缩机最大运行转速不得超过9441r/min。In the transportation of hydrogen-blended natural gas through pipelines,changes in gas composition can have a significant impact on the operational characteristics of pipelines and compressors.Therefore,this study investigates on the influence of hydrogen blending in natural gas on the thermohydraulic characteristics of natural gas pipelines.By developing a temperature-pressure coupled model to solve the thermohydraulic characteristics of pipeline and a compressor performance similarity model considering the change in the isentropic process coefficient due to hydrogen blending,the impact of hydrogen blending in natural gas on the thermohydraulic characteristics of pipeline and the combined operation of pipeline network and compressors are analyzed.The research results show that,compared to pure natural gas,hydrogen-blended natural gas can reduce pipeline friction resistance,and the maximum volume flow rate can be increased by 14.73%,while the gas transportation power exhibits an opposite trend.Under the assumption of constant inlet pressure and energy flow rate,as the hydrogen blending ratio increases,the flow rate-pressure drop increases and the temperature drop decreases.Compared to high-pressure long-distance gas pipelines,hydrogen blending has a smaller impact on the outlet pressure of medium-pressure long-distance gas pipelines.At average temperature,the outlet pressure of a medium-pressure pipeline with a 30% hydrogen blending ratio decreases by 13.75%compared to the 0% hydrogen blending ratio,which is lower than the 15.35% of the high-pressure pipeline.As the hydrogen blending ratio increases,the pressure ratio curve of the centrifugal compressor gradually shifts towards low-pressure ratios.When operating in conjunction with the pipeline network,as the hydrogen blending ratio increases,the working point of the joint operation moves towards a decrease in pressure and flow rate,ultimately leading to a decrease in gas transportation volume.In order to keep the energy flow of compressor constant,the hydrogen m

关 键 词：掺氢天然气 管网输送 水热特性 压缩机 联合运行 

分 类 号：TH452[机械工程—机械制造及自动化]