在氣力輸送過程中，物料在輸料管的粘附與物料特性、氣流速度及壁面光滑情況有關，由于物料對管道內壁起粘附作用，時間長了便會逐漸積累，使管道流通面積變小，嚴重的還會造成輸料管堵塞。物料在管內產生粘附的原因各不相同，大致可分成以下六類：

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、熔點低或軟化點低的物料

1. Materials with low melting point or softening point

這些物料在輸送過程中，由于摩擦、碰撞等會產生少量熱能，使得物料表面產生熔融、軟化而粘結。由于在壓力下輸送，時間長了管道的粘附層更加穩定，例如石蠟、熱可塑性樹脂、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、含油分的植物種子或其他含油物料，在輸送過程中，受熱、受壓后分泌物對管道產生粘結。

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、在輸送過細物料時，如顆粒小于1μm的細粉，容易粘附管壁。如鉛丹、炭黑、氧化鈦等。

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、具有吸濕性或溶水性的物料，依靠表面水分粘附于管壁。如鹽類、芒硝、農藥等。

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

5、帶電性物料粘壁。物料粘壁附著力的大小，與顆粒帶電量及顆粒、壁面、輸送空氣的導電率有關。如顆粒與管壁一方為導體，另一方為絕緣體時，附著力非常大，不易清除。如合成樹脂粉末、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、由于機械的互相牽制而粘附管壁的物料，其附著力與顆粒本身的表面形狀及管道壁面的形態有關。如纖維類等。

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.

上面我們講了一下經常容易發生粘附管壁的六大類物料，其實還有很多，我們就不一一列舉了，后面我們會根據這幾類物料，介紹一下防止粘附的一下措施，希望對大家有所幫助。

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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