稀相氣力輸送是輸送物料常用的方法。
Dilute phase pneumatic conveying is a common method of conveying materials.
這個過程使用相對大量的空氣來輸送相對少量的材料，并且比密相系統(tǒng)的壓力更低。材料在空氣中懸浮的同時，通過系統(tǒng)高速運輸。
This process uses a relatively large amount of air to transport a relatively small amount of material, and the pressure is lower than that of the dense phase system. While the materials are suspended in the air, they are transported through the system at high speed.
它通常被稱為懸浮流，因為粒子在空氣中被懸浮著，當它們被吹或吸過管道時。為了使物料保持懸浮狀態(tài)，有必要保持小的輸送空氣速度，對于大多數(shù)物料來說，這個速度大約是2500 - 6000 fpm（約10-30m/s）。
It is often called suspended flow because particles are suspended in the air when they are blown or sucked through the pipe. In order to keep the material suspended, it is necessary to maintain a small conveying air speed. For most materials, this speed is about 2500 - 6000 FPM (about 10-30m / s).
稀相氣力輸送系統(tǒng)體系的特征是:
The characteristics of dilute phase pneumatic conveying system are:
高速輸送，每分鐘3200到8000英尺(約1000-2500米)
High speed transportation, 3200 to 8000 feet per minute (about 1000-2500 meters)
工作壓力在5-12 PSIG(正)或4- 12”Hg的負壓力范圍內(nèi)
The working pressure is within the range of 5-12 psig (positive) or 4-12 "Hg
高空氣與固體的負載比(> 2.0)
High air to solid load ratio (> 2.0)
用稀相系統(tǒng)輸送的物質(zhì)范圍幾乎沒有限制。通常以稀相體系輸送的產(chǎn)品包括面粉、樹脂、特殊化學品、飼料、顆粒狀和托盤狀產(chǎn)品。在各種類型的氣力輸送系統(tǒng)中，稀相系統(tǒng)的成本通常是低的。
The range of substances transported by dilute phase system is almost unlimited. Products usually transported in dilute phase system include flour, resin, special chemicals, feed, granular and tray products. In various types of pneumatic conveying systems, the cost of dilute phase system is usually low.
稀相氣力輸送系統(tǒng)限制
Limitation of dilute phase pneumatic conveying system
需要一個相對較高的風量和速度:所以功率要求也很高。較高的氣流速度將有以下其他缺點:
A relatively high air volume and speed are required: therefore, the power requirements are also very high. Higher air velocity will have the following other disadvantages:
1.由于該產(chǎn)品對管道的磨損要大得多，因此該系統(tǒng)不適用于易降解和/或具有研磨性質(zhì)的材料。
1. Since the product has much greater wear on the pipeline, the system is not suitable for materials that are easy to degrade and / or have abrasive properties.
2.產(chǎn)品可能會變形或被壓碎，因此不建議將此工藝用于易碎產(chǎn)品。
2. The product may be deformed or crushed, so this process is not recommended for fragile products.
稀相體系的類型
Types of dilute phase systems
稀釋相系統(tǒng)的設計方法有三種:
There are three design methods for dilution phase system:
1.正壓稀相氣力輸送系統(tǒng)
1. Positive pressure dilute phase pneumatic conveying system
2.負壓或真空稀相氣力輸送系統(tǒng)
2. Negative pressure or vacuum dilute phase pneumatic conveying system
3.正負壓結合氣力輸送系統(tǒng)的組合
3. Combination of positive and negative pressure combined pneumatic conveying system
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