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drag reducing efficiency
相关语句
  减阻率
     Results by GPC indicated that,in a pilot plant the weight-average relative molecular mass of the solution polymers could reach over 5.0×106,and the drag reducing efficiency of the polymers was 55%~63%.
     GPC分析结果表明,中试装置溶液聚合物的重均相对分子质量可达到5.0×106以上,减阻率55%-63%,具有工业化价值。
短句来源
     The drag reducing efficiency is 40% by adding the polymer 0. 01 kg/m3 diesel oil.
     当减阻剂在柴油中的质量浓度为0.01kg/m3时,减阻率可达40.1%。
短句来源
     A 45% of the drag reducing efficiency can be achieved under the conditions of not coping with the polymer(adding mass concentration of 0.01 kg/m~3),which exceeds that of polymer by bulk polymerization(40.1% of DR).
     该聚合物未经脱溶剂处理,减阻率高达45%(添加质量浓度为0.01kg/m3),超过了本体聚合法得到的聚合物(减阻率为40.1%)。
短句来源
     bulk polymerization, temperature 0-30℃, normal pressure, 1.84:1(g/g), C7-C11 olefins, a drag reducing efficiency of 40.1% could be achieved by adding lOppm of polymer to diesel fuels.
     本体聚合法:温度0~30℃、常压、助/主1.84:1(g/g)、C_7~C_(11)烯烃,在0#柴油中添加10ppm,减阻率为40.1%。 已达到国内外同类产品先进水平。
短句来源
     Finai4y, the preferred condition of polymerization are obtained: polymerization in solvent, temperature 0-30℃, normal pressure, 0.79:1(g/g), C7-C11olefins, a drag reducing efficiency of 40.5% could be achieved by adding 10ppm of polymer to diesel fuels;
     溶液聚合法:温度0~30℃、常压、助/主0.79:1(g/g)、适合的单体为C_7~C_(11)烯烃。 在0#柴油中添加10ppm,减阻率为40.5%。
短句来源
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  “drag reducing efficiency”译为未确定词的双语例句
     INFLUENCE OF TEMPERATURE ON DRAG REDUCING EFFICIENCY OF POLY-α-OLEFIN
     温度对聚α-烯烃合成减阻剂的影响
短句来源
     THE INFLUENCE OF THE CHARACTERISTICS OF DRAG REDUCING POLYMERS ON THE DRAG REDUCING EFFICIENCY IN PIPELINE TRANSPORTATION OF CRUDE OIL
     原油输送中减阻剂聚合物的特性对减阻率的影响
短句来源
     In this paper, copolymer of mixed α-olefins from cracking wax was prepared and the drag reducing efficiency of the copolymer was determined.
     介绍了以混合α-烯烃为原料,制备了具有减阻功能的共聚物。
短句来源
  相似匹配句对
     INFLUENCE OF TEMPERATURE ON DRAG REDUCING EFFICIENCY OF POLY-α-OLEFIN
     温度对聚α-烯烃合成减阻剂的影响
短句来源
     efficiency.
     程序公正与实体公正并重:效率。
短句来源
     On Efficiency
     论效率
短句来源
     Polymerization rate and drag reducing efficiency increased with growth of solvent polarity.
     溶剂的极性对聚合反应过程和产物减阻性能有显著影响,极性越大,聚合反应速度越快,聚合物减阻率越大。
短句来源
     Progress in Drag Reducing Surfactant Research
     减阻表面活性剂的研究进展
短句来源
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The effect of molecular weight, molecular weight distribution, molecular structure of the polymer and behavior of the crude oil on drag reducing efficiency are represented. The degradation of the polymer and its effect on the drag reduction are also discussed.

本文讨论了减阻剂聚合物的分子量、分子量分布、分子结构以及不同物性的原油对减阻率的影响。讨论了聚合物降解的情况及对减阻的影响。

Drag reducing agents are oil-soluble polymers with molecular weights ranged from several to ten million. With regard to the number of molecules, the amount of polymer contained in the oil is negligible, and has little effect on the viscosity of the oil. The drag reducing efficiency depends upon the configuration and size of the polymer molecule, and its so- lubility in the oil. Moreover, the efficiency also depends upon the drag reduction technology used. Experiments showed that the efficiency...

Drag reducing agents are oil-soluble polymers with molecular weights ranged from several to ten million. With regard to the number of molecules, the amount of polymer contained in the oil is negligible, and has little effect on the viscosity of the oil. The drag reducing efficiency depends upon the configuration and size of the polymer molecule, and its so- lubility in the oil. Moreover, the efficiency also depends upon the drag reduction technology used. Experiments showed that the efficiency was increased with the amount of the drag reducing agent added within a certain limit, while the increase became less pronounced beyond that limit. The efficiency was also increased markedly with flow velocity. But its effect was not the same for different polymers. For the same pipe diameter, the efficiency was increased with increasing Reynold’s number. The drag reduction efficiency was increased with increasing wall shear stress within a certain limit, but too high shear stress led to a degradation of the polymer and in turn decreased efficiency. A high water content resulted in lower solubility of polymer and lower efficiency. The drag reducing agents used in industry are polyolefins with ultra-high molecular weight at the dosage of tens ppm to give a 20% drag reduction efficiency and 15% increase in oil transported.

原油在管道中输送时,加入少量ppm的减阻剂,增输量可达到10%以上。用作减阻剂的油溶性聚合物,分子量一般高达几百万到上千万。按分子数计算,减阻剂在原油中占的比例微小,因此不会改变原油的粘度。减阻效率决定于聚合物在溶液中的形态,空间尺寸,聚合物的溶解性能以及使用减阻剂的技术。实验表明(1)减阻效率随减阻剂添加量而增加,但减阻剂浓度达到一定值后,减阻率提高缓慢;(2)流体的流速增加,使减阻效率显著增加,但对不同的聚合物影响结果不一样;(3)在管径相同的条件下,流体的雷诺数增加,减阻效率增加;(4)在一定范围内壁剪切应力增加,减阻率也随之增加,但过大的剪切力会使高聚物降解,分子量降低,减阻率下降;(5)原油中含微量水份会影响减阻率。当含水量超过一定值时,因聚合物溶解性不好,反而导致减阻剂失效。目前工业上使用的减阻剂品种主要是超高分子量的聚α—烯烃,在油中的添加量为φn×10ppm以内,使减阻率在20%左右,增输15%左右,可以明显增加经济效益。

In this paper, copolymer of mixed α-olefins from cracking wax was prepared and the drag reducing efficiency of the copolymer was determined. Effects of concentration of catalyst, polymerization temperature, prepolymerization time, impurity contents in monomer on intrinsic viscosity of the copolymer and conversion were discussed. It was shown that a copolymer of higher molecular weight was obtained in lower catalyst concentration and lower prepolymerization temperature. The component of the copolymer was...

In this paper, copolymer of mixed α-olefins from cracking wax was prepared and the drag reducing efficiency of the copolymer was determined. Effects of concentration of catalyst, polymerization temperature, prepolymerization time, impurity contents in monomer on intrinsic viscosity of the copolymer and conversion were discussed. It was shown that a copolymer of higher molecular weight was obtained in lower catalyst concentration and lower prepolymerization temperature. The component of the copolymer was analyzed by gas chromatography and DSC. It was shown that better drag reducing efficiency could be obtained when copolymers with higher intrinsic viscosity were used and the composition of copolymer approached that of the monomers. The drag redncing test indicated that a drag re ducing efficiency of over 10% could be achieved by adding only 10ppm of the copolymer to Da Qing crude oil.

介绍了以混合α-烯烃为原料,制备了具有减阻功能的共聚物。讨论了催化剂浓度、聚合温度、预聚合时间、原料单体中杂质含量对共聚物特性粘度和转化率的影响。试验表明,在较低的催化剂浓度和预聚合温度下,能得到较高分子量的聚合物。气相色谱法和DSC法测定其组成和单体混合物的组成基本一致,表明共聚物是一种无规的梳状结构聚合物。该聚合物达到较高特性粘度时,能获得较好的减阻率。

 
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