稀相輸送是在密閉管道中氣流速度足夠高、粉粒料在氣流中所呈的懸浮狀態(tài)，氣力輸送裝置根據輸料管內的壓強是否高于大氣壓分為負壓和正壓稀相氣力輸送系統(tǒng)兩種。

　　Dilute phase conveying refers to the suspended state of powder particles in a closed pipeline with sufficient airflow velocity. Pneumatic conveying devices are divided into negative pressure and positive pressure dilute phase pneumatic conveying systems based on whether the pressure inside the conveying pipeline is higher than atmospheric pressure.

　　稀相輸送一般適用于被輸送物料的質量和粒度較小、干燥和易流動、輸送距離較短的場合；在氣力輸送中，常用混合比或輸送濃度或固氣比R表示氣流中固相濃度，按照物料和氣流在管道中的比例和兩相流動的特征，氣力輸送系統(tǒng)分為稀相輸送（懸浮流輸送）、密相輸送和栓流輸送三種?；旌媳韧ǔ镽＝1-5，非常大值可達15左右的氣力輸送稱為稀相輸送系統(tǒng)，在稀相輸送中，氣流速度較高、通常為12-40m/s，固體顆粒呈懸浮狀態(tài)。

　　Dilute phase conveying is generally suitable for situations where the quality and particle size of the conveyed material are small, dry and easy to flow, and the conveying distance is short; In pneumatic conveying, the commonly used mixing ratio or conveying concentration or solid gas ratio R represents the solid concentration in the airflow. According to the ratio of materials and airflow in the pipeline and the characteristics of two-phase flow, pneumatic conveying systems are divided into three types: dilute phase conveying (suspension flow conveying), dense phase conveying, and plug flow conveying. A pneumatic conveying system with a mixing ratio of R=1-5 and a maximum value of around 15 is called a dilute phase conveying system. In dilute phase conveying, the airflow velocity is relatively high, usually 12-40m/s, and solid particles are suspended.

　　氣力輸送從工作原理上主要分為動壓輸送和靜壓輸送；動壓輸送即把氣體的壓力能轉化為動能進行工作稱為懸浮輸送、灰氣比小于40，屬于稀相輸送。靜壓輸送即把氣體的壓力能轉化為推力進行工作稱為栓流輸送或柱塞輸送、灰氣比大于40，屬于濃相輸送。

　　Pneumatic conveying is mainly divided into dynamic pressure conveying and static pressure conveying based on its working principle; Dynamic pressure conveying, which converts the pressure energy of gas into kinetic energy for operation, is called suspension conveying. When the ash to gas ratio is less than 40, it belongs to dilute phase conveying. Static pressure conveying, which converts the pressure energy of gas into thrust for operation, is called plug flow conveying or plunger conveying. If the ash gas ratio is greater than 40, it belongs to dense phase conveying.

　　多年來，恒通粉體正壓稀相氣力輸送系統(tǒng)項目經驗豐富，輸送的物料有滑石粉、石灰粉、粉煤灰、煤粉、白土、橡膠粉、生物質配料、化工粉料、石墨、脫硫劑、氧化鎂、面粉、豆粉、豆皮、淀粉、碳酸鈉、葡萄糖粉、硅藻土、木粉、石油焦粉、焦粒、氧化鋁粉、石粉、水泥、纖維素、礦粉、硫酸鎂、片狀硫磺、炭黑、碳素、PE樹脂粉等等粉體輸送。

　　For many years, Hengtong has rich experience in the project of positive pressure dilute phase pneumatic conveying system for powders. The materials conveyed include talc powder, lime powder, fly ash, coal powder, clay, rubber powder, biomass ingredients, chemical powders, graphite, desulfurizer, magnesium oxide, flour, soybean powder, soybean skin, starch powder, sodium carbonate, glucose powder, diatomaceous earth, wood powder, petroleum coke powder, coke granules, alumina powder, stone powder, cement, cellulose, mineral powder, magnesium sulfate, flake sulfur, carbon black, carbon, PE resin powder and other powders.

　　正壓稀相氣力輸送系統(tǒng)優(yōu)點：1）整個輸送過程密閉、受氣候環(huán)境條件的影響小，不僅改善了工作環(huán)境且被輸送物料不致吸濕、污損或混入其他雜質，從而保證被輸送物料的質量；2）設備簡單、結構緊湊、工藝布置靈活、占用面積小、選擇輸送線路容易；3）在輸送過程中可同時進行混合、粉碎、分級、烘干等，也可進行某些化學反應；4）系統(tǒng)內部是正壓、物料易從排料口卸出；5）易對于整個系統(tǒng)實現集中控制和自動化；6）由于帶粉塵氣體不通過羅茨風機內部，對風機的磨損少、延長設備使用壽命；7）適用于從一點向多點進行分散輸送物料。

　　Advantages of positive pressure dilute phase pneumatic conveying system: 1) The entire conveying process is sealed and less affected by climatic conditions, which not only improves the working environment but also prevents the conveyed material from absorbing moisture, staining or mixing with other impurities, thereby ensuring the quality of the conveyed material; 2) Simple equipment, compact structure, flexible process layout, small footprint, and easy selection of conveying routes; 3) During the transportation process, mixing, crushing, grading, drying, and certain chemical reactions can be carried out simultaneously; 4) The internal system is under positive pressure, and materials are easily discharged from the discharge port; 5) Easy to achieve centralized control and automation of the entire system; 6) Due to the fact that dusty gas does not pass through the interior of the Roots blower, it causes less wear on the blower and prolongs the service life of the equipment; 7) Suitable for dispersing and conveying materials from one point to multiple points.

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