永磁耦合器在注水系统中的应用

Application of Permanent Magnet Coupler in Water Injection System

针对油田地面注水系统中常规电动机拖动注水泵的装机功率大、能耗高、效率低和运保困难等问题,在某采油厂注水系统中试验应用电动机永磁耦合传动装置。利用永磁耦合器的泵轮力矩与其转速的平方成正比的原理,通过启动瞬间泵轮的低转速运行来降低电动机启动力矩,避免调节阀的节流损失,变频应用的谐波电磁波干扰以及安装环境限制等问题。试验应用结果表明,与传统变频等设备相比,永磁耦合器具有低载启动、调速简单、提高动力传递效果等优点,同时可有效降低电动机有功消耗,有功节电率可达9.0%。

Aiming at the problems of high installed power, high energy consumption, low efficiency and difficulty in operation and maintenance of conventional motor- driven water injection pump in oilfield surface water injection system, the permanent magnet coupling drive device of motor is applied in a field test in an oil production plant. Based on the principle that the pump wheel torque of permanent magnet coupler is proportional to the square of its rotational speed,the starting torque of motor is reduced by the low rotational speed operation of the pump wheel at the moment of starting, the throttling loss of the regulating valve is avoided, and the harmonic electromagnetic interference of frequency conversion application and the limitation of installation environment are also discussed. Experiments show that, compared with traditional frequency conversion equipment, permanent magnet coupler has the advantages of low-load starting, simple speed regulation, and improved power transmission effect. At the same time,it can effectively reduce the active power consumption of motor,and the active power saving rate can reach 9.0%.