变频技术在长输管道输油泵机组上的应用

传统工频定速电机在管道输量较低时,既浪费电能,又缩短了输油泵机组的维护周期和使用寿命。针对该问题,提出了对泵机组采用变频调速改造的方法进行节能控制。输油泵节能原理：保持离心泵输送流量不变,减小离心泵扬程。以某实际运行长输管道为例,详细介绍了高压变频改造项目在长输管道输油泵机组上的节能测试过程,对比分析了输油泵机组加装变频装置前后的节能效果。结果表明：加装变频装置后,节流率、功率因数和机组效率均满足评价标准SY/T 6275-2007限定值和节能评价值的要求,管道2008-2009年度节省电费304.5×104元。

Application of frequency conversion to energy saving technique in pump sets of long-distance pipelines

Traditional power-frequency fixed speed motor not only wastes electrical energy, but also shortens the maintenance period and service life of pump units when oil flowrate of pipeline is low. To solve the problem, this paper considers that adopting frequency control methods to carry out energy saving is available. The mode of power saving principle of oil pump is that flowrate of centrifugal pump is kept at a constant but the head of centrifugal pump should be cut down. Taking a long-distance pipeline as an example, the testing process of energy saving for oil pump sets with the mode of high-pressure frequency conversion is described. Energy saving effectiveness before and after the installation of frequency conversion device is compared. Results show that after installation of the frequency conversion device, the throttling ratio, power factor and unit efficiency all satisfy the energy saving assessment in limit value and evaluation value specified in SY/T6275-2007, and power fare in 304.5 million CNY from 2008 to 2009 are saved for the whole pipeline.