随着长输天然气管道无人站建设和区域化管理模式不断深入推进,由于长输天然气管道离心式压缩机运行压力高且输送介质为危险化学品,离心式压缩机防喘振控制系统失效后若无人工干预出现持续喘振会产生严重后果,同时按照API 670—2014《机器保护系统》相关要求,长输天然气管道离心式压缩机除了防喘振控制以外,还宜增加喘振检测功能，宜选用多种喘振检测方式对喘振情况进行监测,以对不同喘振情况作出快速响应。通过分析离心式压缩机发生喘振后的相关参数变化特征,发现离心式压缩机喘振时出口压力、流量变化幅度较大且周期性较为明显。提出了离心式压缩机多种喘振周期计数、喘振检测的相关思路,并对离心式压缩机运行时振动报警值设定提出建议。研究结果对于长输天然气管道离心式压缩机防喘振控制失效后,以喘振检测作为后备保护的相关研究具有借鉴意义。

As the development and regionalized management mode of unmanned station continue to advance, the centrifugal compressors for long-distance pipeline, with high operating pressure and handling hazardous process medium become an increasing concern. If there is no human intervention after the compressor surge control system fails, the continuous surge of the compressor could result in serious consequences. According to the relevant requirements of the API 670—2014 Machine Protection Systems, the long-distance pipeline centrifugal compressor should be provided with surge detection function in addition to the surge control. A variety of detection methods should be used to monitor the surge conditions for centrifugal compressor, so as to make a rapid response to different surge conditions of the compressor. The changes in characteristics of relevant parameters after centrifugal compressor surge are analyzed. It is found that the discharge pressure and flowrate change rapidly and periodically during surge of compressor. Finally, a variety of related ideas about surge cycle counting and surge detection are proposed, and suggestions are provided for the setting of vibration alarm values during compressor operation. This study provides reference for related research of surge detection as an additional line of defense in case the surge control of the centrifugal compressor of long-distance pipeline fails.