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氣力輸送裝置中節流孔板的作用是什么

文章來源: 作者:羅茨機電 發布時間:2022-02-26 瀏覽次數:1193

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氣力輸送又稱氣流輸送,是利用氣流的力量,在封閉的管道中,沿氣流的方向將粒狀物料輸送到終端。它是流態化技術的具體應用。物料氣力輸送裝置結構簡單,操作方便,可作水平和垂直方向輸送。

Pneumatic conveying, also known as airflow conveying, uses the force of airflow to transport granular materials to the terminal along the direction of airflow in a closed pipeline. It is the specific application of fluidization technology. The material pneumatic conveying device has the advantages of simple structure and convenient operation, and can be transported horizontally and vertically.

物料氣力輸送裝置出廠前對物料的系統氣體比進行初步的預算和配置,即物料(物料)與氣體(輸送介質)的質量比。料氣比,即需要輸送一定重量的物料所需要的氣體的重量,其選定指標是根據物料的性質、物料參數、輸送形式、系統輸出量、系統管徑等參數綜合考慮而設定的。

The material pneumatic conveying device makes a preliminary budget and configuration for the system gas ratio of materials before leaving the factory, that is, the mass ratio of materials (materials) to gas (conveying medium). The material gas ratio refers to the weight of the gas required to transport a certain weight of material. Its selected index is set according to the comprehensive consideration of material properties, material parameters, transportation form, system output, system pipe diameter and other parameters.

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物料氣力輸送裝置按照設計思路完成所有的安裝工作后,所有的維護配置是不準備更改的,但在此調試環節會對節流孔板進行多次修改。多次修改孔板的目的是為了調節進入密閉管道的空氣流量,應與物料的重量相匹配。當達到匹配值時,我們輸送的材料多,消耗的氣體少,從而達到節約資源和穩定系統的目的。

After all the installation work of the material pneumatic conveying device is completed according to the design idea, all the maintenance configurations are not ready to be changed, but the throttle orifice will be modified many times in this commissioning link. The purpose of modifying the orifice plate for many times is to adjust the air flow into the closed pipe, which should match the weight of the material. When the matching value is reached, we transport more materials and consume less gas, so as to save resources and stabilize the system.

在氣力輸送裝置中,節流孔裝置有很多種形式,如螺桿式、管接頭式、壓板式等。在漫長的制度演變過程中,出現了許多先進的制度形式。節流孔板的作用是使氣路管道適當位置的孔徑變小。當氣體通過縫隙變小引起的收縮時,流束會變薄或收縮。流梁的小的截面發生在實際收縮口的下游,稱為收縮截面。在收縮流段,流速大,流速的增加伴隨著收縮流段壓力的大幅度降低。當光束擴展到更大的區域時,速度減小,壓力大,但下游壓力并沒有完全恢復到上游壓力,這是由于內部湍流消耗更大。

In pneumatic conveying devices, there are many forms of orifice devices, such as screw type, pipe joint type, pressing plate type and so on. In the long process of institutional evolution, many advanced institutional forms have emerged. The function of throttle orifice plate is to reduce the aperture at the appropriate position of gas pipeline. When the gas shrinks through the gap, the flow beam will become thinner or shrink. The small section of the flow beam occurs downstream of the actual shrinkage port, which is called the shrinkage section. In the contraction section, the flow velocity is large, and the increase of flow velocity is accompanied by the significant decrease of pressure in the contraction section. When the beam expands to a larger area, the velocity decreases and the pressure is high, but the downstream pressure does not fully return to the upstream pressure, which is due to the greater internal turbulence consumption.

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