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膏體料漿管道輸送壓力損失的影響因素

Influence factors of pressure loss in pipeline transportation of paste slurry

  • 摘要: 為研究膏體料漿管道輸送過程中的壓力損失,本文建立了新型閉路環管試驗測試平臺,研究了管徑、料漿流速、料漿中固相含量和物料粒徑對膏體料漿管道輸送壓力損失的影響。流速對壓力損失的影響分兩個階段:當流速小于黏性過渡流速時,壓力損失隨流速呈線性增加;當流速大于黏性過渡流速時,壓力損失隨著流速增加呈1~2次多項式增加,且增加速率遠大于流速增加速率。壓力損失隨管徑增大呈負冪指數減小,隨料漿中固相質量分數的增加呈指數增加。在相同工況條件下,細粒級較粗粒級料漿管輸壓力損失更大,且黏性過渡流速較大,壓力損失隨流速增加相對緩慢。

     

    Abstract: A new pipe loop test platform was built to study the influence factors and levels of pressure loss in slurry pipe transportation. The influences of pipe inner-diameter, flow velocity, slurry concentration and particle size on the pressure loss were investigated. It is found that the influence of flow velocity on the pressure loss can be divided into two stages:when the flow velocity is less than the viscous transition flow rate, the pressure loss increases linearly with the increasing of flow velocity;but when the flow velocity is greater than the viscous transition velocity, the pressure loss increases in linear to quadratic polynomials with the increase of flow velocity, and the increasing rate is greater than that of flow velocity. The pressure loss negative-power decreases with the increasing of pipe diameter, but it exponentially increases with increasing slurry concentration. Under the same working condition, the pressure loss of fine-grained slurry is greater than coarse-grained slurry, the viscous transition velocity of fine-grained slurry is larger, but the in-crease in pressure loss of fine-grained slurry with flow velocity is relatively slow.

     

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