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Kelishi丨In the pneumatic conveying system, several states of the material conveying process

Kelishi丨In the pneumatic conveying system, several states of the material conveying process

  • Categories:News Center
  • Time of issue:2022-05-06 11:38

(Summary description)在气力输送系统中,由于不同管段的风速不同,物料的流动状态会发生明显的变化。水平输送管道有六种不同的流动状态。气力输送专家科里时将为您介绍气力输送系统中的六种不同的物料流动状态。   首先是均匀流动。当气力输送系统中气流速度较大时,颗粒几乎均匀分布,物料处于悬浮状态输送。 第二是管底流。当气力输送系统的气流速度开始下降时,物料开始接近管道底部,越接近管道底部,分布越密集。然而,物料输送过程并没有停止。其状态是一侧不规则滚动,碰撞,一侧输送。 第三是疏密流。当气流速度小于一定值时,物料开始在水平管道内以不均匀的状态流动,一些颗粒在管理中发生滑动,但物料输送仍未停止。   第四是停滞流。随着空气流速的进一步降低,大部分颗粒开始失去悬浮能力,在管底处停滞。此时局部管道的内段由于材料的堆积而变小,导致该区域空气流速增大,滞留的材料被吹走。物质输送处于停滞、积累、扬弃的循环中,形成不稳定的输送状态。 第五是部分流。在气力输送系统中气流速度太小,材料粒子堆积在管道的底部,气流在堆积物料的上方流动,在气流的吹动下,物料上方的颗粒做不规则运动。随着时间的推移,堆积层像沙丘一样向前流动。 第六是栓塞流。如果气力输送系统中的物料堆积层开始填满管道,由于压缩空气的存在,物料柱前后会形成压差,此时物料将由压差推动输送。   一般情况下,在水平输送管道中,风速越大,输送物料越接近均匀分布。当空气流速不足时,流动状态开始改变。在气力输送系统的初期,物料的输送一般是按照均匀流或管底流进行的。最后物料输送接近疏密流,形成停滞流。水平管段越长,这一现象越明显。当气流速度降低到一定限度时,会产生明显的脉动,在管道弯头处会产生周期性的冲击压力。

Kelishi丨In the pneumatic conveying system, several states of the material conveying process

(Summary description)在气力输送系统中,由于不同管段的风速不同,物料的流动状态会发生明显的变化。水平输送管道有六种不同的流动状态。气力输送专家科里时将为您介绍气力输送系统中的六种不同的物料流动状态。



 

首先是均匀流动。当气力输送系统中气流速度较大时,颗粒几乎均匀分布,物料处于悬浮状态输送。

第二是管底流。当气力输送系统的气流速度开始下降时,物料开始接近管道底部,越接近管道底部,分布越密集。然而,物料输送过程并没有停止。其状态是一侧不规则滚动,碰撞,一侧输送。

第三是疏密流。当气流速度小于一定值时,物料开始在水平管道内以不均匀的状态流动,一些颗粒在管理中发生滑动,但物料输送仍未停止。



 

第四是停滞流。随着空气流速的进一步降低,大部分颗粒开始失去悬浮能力,在管底处停滞。此时局部管道的内段由于材料的堆积而变小,导致该区域空气流速增大,滞留的材料被吹走。物质输送处于停滞、积累、扬弃的循环中,形成不稳定的输送状态。

第五是部分流。在气力输送系统中气流速度太小,材料粒子堆积在管道的底部,气流在堆积物料的上方流动,在气流的吹动下,物料上方的颗粒做不规则运动。随着时间的推移,堆积层像沙丘一样向前流动。

第六是栓塞流。如果气力输送系统中的物料堆积层开始填满管道,由于压缩空气的存在,物料柱前后会形成压差,此时物料将由压差推动输送。



 

一般情况下,在水平输送管道中,风速越大,输送物料越接近均匀分布。当空气流速不足时,流动状态开始改变。在气力输送系统的初期,物料的输送一般是按照均匀流或管底流进行的。最后物料输送接近疏密流,形成停滞流。水平管段越长,这一现象越明显。当气流速度降低到一定限度时,会产生明显的脉动,在管道弯头处会产生周期性的冲击压力。

  • Categories:News Center
  • Time of issue:2022-05-06 11:38
  • Views:
Information

In the pneumatic conveying system, due to the different wind speeds of different pipe sections, the flow state of the material will change significantly. There are six different flow states for horizontal conveying pipes. Pneumatic conveying expert Corey will introduce you to six different material flow states in a pneumatic conveying system.

科里时丨气力输送系统中,物料输送过程的几种状态

 

The first is uniform flow. When the air velocity in the pneumatic conveying system is large, the particles are almost evenly distributed, and the material is conveyed in a suspended state.

The second is the tube underflow. When the airflow speed of the pneumatic conveying system begins to decrease, the material begins to approach the bottom of the pipeline, and the closer it is to the bottom of the pipeline, the denser the distribution. However, the material conveying process did not stop. Its state is irregular rolling on one side, collision, and conveying on one side.

The third is density flow. When the airflow speed is less than a certain value, the material begins to flow in an uneven state in the horizontal pipe, and some particles slip during the management, but the material conveying has not stopped.

科里时丨气力输送系统中,物料输送过程的几种状态

The fourth is stagnant flow. As the air flow rate is further reduced, most of the particles begin to lose their suspending ability and stagnate at the bottom of the tube. At this time, the inner section of the local pipe becomes smaller due to the accumulation of materials, resulting in an increase in the air velocity in this area, and the retained material is blown away. Material transport is in the cycle of stagnation, accumulation and sublation, forming an unstable transport state.

The fifth is partial flow. In the pneumatic conveying system, the airflow speed is too small, the material particles accumulate at the bottom of the pipeline, and the airflow flows above the accumulated materials. Under the blowing of the airflow, the particles above the materials move irregularly. Over time, the layers of accumulation flowed forward like sand dunes.

The sixth is embolic flow. If the material accumulation layer in the pneumatic conveying system begins to fill the pipeline, due to the existence of compressed air, a pressure difference will be formed before and after the material column, and the material will be pushed and conveyed by the pressure difference.

科里时丨气力输送系统中,物料输送过程的几种状态

 

In general, in a horizontal conveying pipeline, the higher the wind speed, the closer the conveyed material is to be evenly distributed. When the air flow rate is insufficient, the flow state begins to change. In the early stage of the pneumatic conveying system, the conveying of materials is generally carried out according to uniform flow or pipe bottom flow. Finally, the material transportation is close to the dense and dense flow, forming a stagnant flow. The longer the horizontal pipe section, the more obvious this phenomenon is. When the airflow speed is reduced to a certain limit, obvious pulsation will occur, and periodic impact pressure will be generated at the elbow of the pipe.

 

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