在气力输送过程中，物料在输料管的粘附与物料特性、气流速度及壁面光滑情况有关，由于物料对管道内壁起粘附作用，时间长了便会逐渐积累，使管道流通面积变小，严重的还会造成输料管堵塞。物料在管内产生粘附的原因各不相同，大致可分成以下六类：

In the process of pneumatic conveying, the adhesion of materials on the conveying pipe is related to the characteristics of materials, air velocity and smoothness of the wall. Due to the adhesion of materials on the inner wall of the pipe, it will gradually accumulate over a long time, reducing the flow area of the pipe, and even causing the blockage of the conveying pipe. The reasons for the adhesion of materials in the pipe are different, which can be roughly divided into the following six categories:

1、熔点低或软化点低的物料

1. Materials with low melting point or softening point

这些物料在输送过程中，由于摩擦、碰撞等会产生少量热能，使得物料表面产生熔融、软化而粘结。由于在压力下输送，时间长了管道的粘附层更加稳定，例如石蜡、热可塑性树脂、硫磺等。

During the transportation of these materials, a small amount of heat energy will be generated due to friction and collision, which makes the surface of materials melt, soften and bond. As the pipeline is transported under pressure, the adhesive layer of the pipeline becomes more stable after a long time, such as paraffin, thermoplastic resin, sulfur, etc.

2、含油分的植物种子或其他含油物料，在输送过程中，受热、受压后分泌物对管道产生粘结。

2. During the transportation of oil-bearing plant seeds or other oil-bearing materials, the secretion will bond to the pipeline after being heated and pressed.

3、在输送过细物料时，如颗粒小于1μm的细粉，容易粘附管壁。如铅丹、炭黑、氧化钛等。

3. When conveying over fine materials, such as particles less than 1 μ It is easy to adhere to the pipe wall. Such as lead, carbon black, titanium oxide, etc.

4、具有吸湿性或溶水性的物料，依靠表面水分粘附于管壁。如盐类、芒硝、农药等。

4. Materials with hygroscopicity or water solubility adhere to the pipe wall by surface moisture. Such as salt, mirabilite, pesticide, etc.

5、带电性物料粘壁。物料粘壁附着力的大小，与颗粒带电量及颗粒、壁面、输送空气的导电率有关。如颗粒与管壁一方为导体，另一方为绝缘体时，附着力非常大，不易清除。如合成树脂粉末、谷粉等。

5. The charged material sticks to the wall. The adhesion of materials to the wall is related to the charge of particles and the conductivity of particles, wall and air. If one side of the particle and the pipe wall is a conductor and the other side is an insulator, the adhesion is very large and it is not easy to remove. Such as synthetic resin powder, rice powder, etc.

6、由于机械的互相牵制而粘附管壁的物料，其附着力与颗粒本身的表面形状及管道壁面的形态有关。如纤维类等。

6. The adhesion of the materials adhering to the pipe wall due to mechanical mutual restraint is related to the surface shape of the particles themselves and the shape of the pipe wall. Such as fiber, etc.

上面我们讲了一下经常容易发生粘附管壁的六大类物料，其实还有很多，我们就不一一列举了，后面我们会根据这几类物料，介绍一下防止粘附的一下措施，希望对大家有所帮助。

As mentioned above, there are six kinds of materials that are easy to adhere to the pipe wall. In fact, there are many more. We will not list them one by one. Later, we will introduce some measures to prevent adhesion according to these kinds of materials, hoping to help you.

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