稀相输送是在密闭管道中气流速度足够高、粉粒料在气流中所呈的悬浮状态，气力输送装置根据输料管内的压强是否高于大气压分为负压和正压稀相气力输送系统两种。

　　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.

　　稀相输送一般适用于被输送物料的质量和粒度较小、干燥和易流动、输送距离较短的场合；在气力输送中，常用混合比或输送浓度或固气比R表示气流中固相浓度，按照物料和气流在管道中的比例和两相流动的特征，气力输送系统分为稀相输送（悬浮流输送）、密相输送和栓流输送三种。混合比通常为R＝1-5，最大值可达15左右的气力输送称为稀相输送系统，在稀相输送中，气流速度较高、通常为12-40m/s，固体颗粒呈悬浮状态。

　　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.

　　气力输送从工作原理上主要分为动压输送和静压输送；动压输送即把气体的压力能转化为动能进行工作称为悬浮输送、灰气比小于40，属于稀相输送。静压输送即把气体的压力能转化为推力进行工作称为栓流输送或柱塞输送、灰气比大于40，属于浓相输送。

　　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.

　　多年来，恒通粉体正压稀相气力输送系统项目经验丰富，输送的物料有滑石粉、石灰粉、粉煤灰、煤粉、白土、橡胶粉、生物质配料、化工粉料、石墨、脱硫剂、氧化镁、面粉、豆粉、豆皮、淀粉、碳酸钠、葡萄糖粉、硅藻土、木粉、石油焦粉、焦粒、氧化铝粉、石粉、水泥、纤维素、矿粉、硫酸镁、片状硫磺、炭黑、碳素、PE树脂粉等等粉体输送。

　　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.

　　正压稀相气力输送系统优点：1）整个输送过程密闭、受气候环境条件的影响小，不仅改善了工作环境且被输送物料不致吸湿、污损或混入其他杂质，从而保证被输送物料的质量；2）设备简单、结构紧凑、工艺布置灵活、占用面积小、选择输送线路容易；3）在输送过程中可同时进行混合、粉碎、分级、烘干等，也可进行某些化学反应；4）系统内部是正压、物料易从排料口卸出；5）易对于整个系统实现集中控制和自动化；6）由于带粉尘气体不通过罗茨风机内部，对风机的磨损少、延长设备使用寿命；7）适用于从一点向多点进行分散输送物料。

　　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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