所有涡轮机械都受到退化，随着时间的推移，将影响系统的效率和操作性能。扭矩监测，基于热平衡，能量平衡等方法，使用许多参数，如压力，温度，流速，气体组成等，需要精确的仪器来正确测量最低的不确定性。相位位移技术可用于准确地测量扭矩在耦合到满量程扭矩的1％内，具有所有电气和机械源的组合。与替代方法相比，这种准确性提供了计算效率时的最低不确定性。
PowerLign系统最近安装在澳大利亚Qenos Olefins的破解气体压缩机火车上，以确定功率限制的原因。该系统采用相位位移技术进行长期可靠性，消除了对重新校准的需求。两个带拾取齿的环安装在扭转软间隔物上，并且在中心位置啮合。两个单极传感器，分开180度，安装在联轴器上。作为耦合旋转，铁磁齿在传感器线圈中产生交流电压波形，其使用已知的校准参数进行数字处理。由于啮合的拾取齿，该系统被称为单通道相位位移系统，产生两个独立的扭矩测量。该系统将输出扭矩，电源，速度和温度，可容易地与任何DCS系统集成。
PowerLign系统可以在满量程的1％内提供准确性
扭矩，使用单通道相位位移
At the Olefins plant, the operating cycle of the steam-driven, cracked-gas compressor train is 7 to 8 years. During this cycle, the plant reaches production limitations because this compressor train encounters a power limit. To determine the cause of the power limit as “turbine fouling” or “compressor fouling” or a combination of both, was not foreseeable with the instrumentation installed. The cause had long been the subject of an engineering debate between the machinery group, process engineering group and operations department.
安装涉及用“滚入”扭矩计和整体柔性元件更换现有的耦合间隔和柔性半部。扭矩计组件与API标准动态平衡，因此用户没有必要返回用于改造的任何耦合部件。修改耦合后卫，使得可以安装两个可变磁阻传感器，完成机械安装。
Existing coupling arrangement (top) and the retrofitted Smart Spacer (bottom).
On restarting the plant and having completed a number of compressor efficiency improvements, the torque meter clearly showed the 7.5 MW turbine did not require an update and that the major power losses were coming from the compressor. The torque meter also allowed online tuning of the seal gas system of the compressor to establish the lowest power draw from the recycles that the seal system introduces. An additional 200 KW of power was reduced from the turbine load with the manual adjustments made on the seal gas system. The torque meter was used to monitor turbine steam fouling issues and process related compressor fouling so that the corrective online washing can be activated as soon as issues arise.
The historical data collected from the torque meter also provided a baseline of mechanical loading through the drive drain of the cracked-gas compressor over time. This data has been used to determine if increases in the maximum continuous operating speed rating of the compressor and the turbine can be accomplished at minimal costs. This achieved increases in the operating envelope of the compressor. The value of the torque meter has justified the installation of a second system for the Olefins plant’s second steam cracking plant turbine/compressor train in October 2012.
Emerson Industrial Automation
www.EmersonIndustrial.com
提起：设计世界articles那Electronics • electrical那Sensors (position + other)那测试+测量•测试设备
告诉我们你的想法！