天然气管道掺氢输送对离心压缩机气动性能的影响  

Influence of hydrogen-blended natural gas via pipeline transportation on aerodynamic performance of centrifugal compressor

作　　者：陈珂 王硕琨 杜文海 张伟 CHEN Ke;WANG Shuokun;DU Wenhai;ZHANG Wei(School of Mechanical Engineering,Beijing Institute of Petrochemical Technology;Hydrogen Energy Research Centre,Beijing Institute of Petrochemical Technology)

机构地区：[1]北京石油化工学院机械工程学院 [2]北京石油化工学院氢能研究中心

出　　处：《油气储运》2023年第4期398-406,共9页Oil & Gas Storage and Transportation

基　　金：国家自然科学基金资助项目“基于种子气泡与梯度结构协同的微射流相变换热调控机理研究”,52076015;北京市教育委员会科技计划一般项目“超临界二氧化碳离心压缩机流动损失及稳定性研究”,KM201910017007;北京市教委-市基金委联合基金资助项目“微通道/微射流耦合型相变冷却调控原理及方法研究”,KZ202110017026。

摘　　要：为研究天然气管道掺氢输送对离心压缩机气动性能和稳定工作范围的影响,以川气东送管道的GE PCL503压缩机为研究对象进行三维几何建模,采用RANS方法对该压缩机进行三维仿真模拟并与文献实验数据进行对比,验证了数值仿真模型的准确性。基于三维仿真模型研究了不同掺氢比、进口温度对离心压缩机气动性能和喘振裕度的影响。结果表明:随着天然气掺氢比的提高,压缩机的总压比和喘振裕度随之下降,当掺氢比达到20%时,喘振裕度降低19.78%,压比下降6.44%。在近喘振工况下,泄漏涡轨迹前移,泄漏涡强度得到增强,进而扩大了压力面低速区域面积,进一步加快了泄漏流与主流、压力面二次流的掺混,加剧了压力面流动分离和下游通道堵塞程度,其是导致掺氢比增加后压缩机稳定工作范围减少的主要原因。在10%掺氢比下,当进口温度由288 K升至323 K时,对于相同的体积流量,离心压缩机的总压比降低4.27%,等熵效率下降0.65%,喘振裕度增加13.03%,能量流量下降17.4%。研究结果可为天然气掺氢输送压缩机的设计及安全运行提供理论基础。(图10,表6,参22)In order to study the influence of hydrogen-blended natural gas via pipeline transportation on the aerodynamic performance and stable working range of centrifugal compressor,a three-dimensional geometric model was established based on the research object GE PCL503 compressor used in Sichuan-to-East Gas Pipeline.Meanwhile,3D simulation was performed for the compressor with RANS method and comparison was carried out with the experimental data from literature to verify the accuracy of the numerical simulation model.The effects of different hydrogen blending ratios and inlet temperatures on the compressor’s aerodynamic performance and surge margin were studied based on the 3D simulation model.The results show that the total pressure ratio and surge margin of the compressor decrease with the increasing of hydrogen blending ratio.Specifically,the surge margin and pressure ratio decrease by 19.78%and 6.44%respectively when the hydrogen blending ratio reaches 20%.Under the near-surge condition,the leakage vortex has its trajectory moved forward and its strength enhanced,which expand the low-speed area on the pressure surface and further accelerate the mixing of the leakage flow with the main flow and the secondary flow on the pressure surface.Thus,the flow separation on the pressure surface and the blockage of downstream channel are intensified.This is the main reason for reducing the stable working range of compressor after the increase of hydrogen blending ratio.When the inlet temperature increases from 288 K to 323 K at the hydrogen blending ratio of 10%,the total pressure ratio of the centrifugal compressor decreases by 4.27%,the isentropic efficiency decreases by 0.65%,the surge margin increases by 13.03%,and the energy flow decreases by 17.4%under the same volume flow.Generally,the research results could provide a theoretical basis for the design and safe operation of compressor for hydrogen-blended natural gas transportation.(10 Figures,6 Tables,22 References)

关 键 词：天然气管道 掺氢输送 离心压缩机 气动性能 喘振裕度 

分 类 号：TE832[石油与天然气工程—油气储运工程]