减阻剂的模拟环道评价

减阻剂应用于输油管道可以达到增输或降压的目的,其性能评价是一个重要课题。阐述了利用环道进行减阻剂性能评价的原理,并给出了一套室内模拟环道评价装置。对环道的装置构成、设计规格和水力学特征进行了介绍。测定了室内合成EP系列减阻剂的减阻性能,对减阻剂与流体相互作用规律进行了探讨。试验结果表明,雷诺数在9000(对应管壁剪速1276s~(-1)左右时,减阻剂性能达到最大值,之后由于减阻剂的剪切降解导致减阻率降低;减阻率在加剂浓度约15mg/L时达到最大值,约74％。

The Simulative Loop Evaluation for Drag Reduction Agent

When DRA is used in oil pipeline, the ihroughput of the line can be improved or pressure can be decreased. How to evaluate the DRA's performance is an important problem to be discussed. This paper discusses the principle that utilizes the simulative loop to evaluate DRA.and gives out a detailed evaluation apparatus. The components ,design specifications and hydraulics characteristics are introduced. The m value of Xo. 0 diesel ,No. -10 diesel and kernsent bave been determined and their values are 0.08.0.08 and (?) respectively. A series of DRAs named EP have been synthesized in laboratory and their drag reduction ef'fi- cieneies have been determined under different conditions. Comparative tests have shown that the performance of some EP samples have reached or exceeded the DRAs imported from foreign countries. Besides, the interaction law between DRAs and fluids have been examined. The test results have shown that the drag reduction efficiency will reach the maximum when Reynolds number touches approximately 9 000(rel-atively to shear rate 1 276 s ) ,and with the Re's increment ,the drag reduction efficiency will decrease due to shear and degradation. When the concentration of DRA in the fluid is 15 mg/L ,the drag reduction efficiency will get to a maximum of 74%.For those DRAs that have the same molecule structure ,the drag reduction efficiency can be predicted through the measurement of the DRA samples' apparent viscosity. Changing fluid's type only influences Re under a certain flow pressure ,which will result in the variation of the drag reduction efficiency.