Characteristics of positive pressure and negative pressure pneumatic conveying equipment

氣力輸送基本的形式包括正壓氣力輸送與負壓氣力輸送，具體的又可分為吸送式、壓送式、吸送壓送組合式、密相脈沖式以及空氣輸送斜槽式。

The basic forms of pneumatic conveying include positive pressure pneumatic conveying and negative pressure pneumatic conveying. Specifically, it can be divided into suction type, pressure type, combined suction and pressure type, dense phase pulse type and air conveying chute type.

一、正壓氣力輸送

1、 Positive pressure pneumatic conveying

正壓輸送，顧名思義，是用輸送系統(tǒng)起點的氣力輸送風機，將高于大氣壓的的壓縮空氣送入輸送系統(tǒng)中，定量物料在高速運行的氣流的帶動下，到達終點，再經(jīng)過過濾，物料與空氣分離。

Positive pressure conveying, as the name implies, is to use the pneumatic conveying fan at the starting point of the conveying system to send the compressed air higher than atmospheric pressure into the conveying system. Under the driving of the high-speed air flow, the quantitative material reaches the end point, and then is filtered to separate the material from the air.

正壓氣力輸送的特點是：

Positive pressure pneumatic conveying is characterized by:

1、適宜從一處向多出進行分散輸送；

1. Suitable for dispersing and conveying from one place to more places;

2、適合大容量，長距離輸送；

2. Suitable for large capacity and long-distance transportation;

3、供料復雜，卸料簡單；

3. Complex feeding and simple unloading;

此外，正壓輸送還有漏氣檢查處理方便，氣力輸送風機磨損較輕等特點。同時正壓輸送根據(jù)風壓的不同還有低壓（低于50kPa）、中壓（50-100kPa）、高壓之分（100kPa以上）。

In addition, the positive pressure conveying has the characteristics of convenient air leakage inspection and treatment, and the pneumatic conveying fan is less worn. At the same time, the positive pressure transmission can be divided into low pressure (less than 50kPa), medium pressure (50-100kpa) and high pressure (more than 100KPA) according to the wind pressure.

氣力輸送

Pneumatic conveying

二、負壓氣力輸送

2、 Negative pressure pneumatic conveying

負壓輸送，對應的即是利用氣力輸送風機對輸送系統(tǒng)進行抽吸，在系統(tǒng)中形成低于大氣壓的負壓氣流，物料與空氣一同通過管道進入輸送系統(tǒng)并隨氣流達到終點，然后經(jīng)過過濾分離。

The negative pressure conveying corresponds to the suction of the conveying system by the pneumatic conveying fan to form a negative pressure air flow below the atmospheric pressure in the system. The materials and air enter the conveying system through the pipeline and reach the end point with the air flow, and then are filtered and separated.

負壓氣力輸送具有以下特點：

Negative pressure pneumatic conveying has the following characteristics:

1、適宜多處向一處集中輸送，對于堆積面廣、分散的物料及其方便；

1. It is suitable for centralized transportation from multiple places to one place, which is convenient for materials with wide stacking surface and scattered distribution;

2、供料簡單，卸料復雜；

2. Simple feeding and complicated unloading;

3、負壓吸送，物料不會外泄，也無須擔心氣力輸送風機的油分、水分混入物料；

3. Negative pressure suction, the material will not leak, and there is no need to worry about the oil and water of the pneumatic conveying fan mixing into the material;

4、容量及輸送距離不宜過大過長，真空度一般控制在40-50kPa；

4. The capacity and transmission distance should not be too large and too long, and the vacuum degree is generally controlled at 40-50kpa;

5、尾氣除塵較為重要，否則易導致氣力輸送風機故障；

5. Dust removal of tail gas is very important, otherwise it is easy to cause failure of pneumatic conveying fan;

正壓輸送與負壓輸送在運用場合上，有著明顯的特點差異。企業(yè)可根據(jù)自身物料特性及生產(chǎn)工藝的裝卸特點，選擇合適的氣力輸送方式。確定方式之后再根據(jù)物料特性、輸送濃度等詳細設計輸送系統(tǒng)。

There are obvious differences between positive pressure conveying and negative pressure conveying in application. The enterprise can choose the appropriate pneumatic conveying mode according to its own material characteristics and the loading and unloading characteristics of the production process. After the mode is determined, the transport system is designed in detail according to the material characteristics and transport concentration.

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