负压稀相气力输送系统主要采用负压罗茨真空泵作为动力源，管道输送压力为低真空状态，管道风速约10-35米/秒,物料在管道内呈雾状。负压输送起点压力等于或接近大气压，终点压力在-10到-50Kpa之间，管道真空度沿气力输送管道逐渐增高。

　　The negative pressure dilute phase pneumatic conveying system mainly uses a negative pressure Roots vacuum pump as the power source. The pipeline conveying pressure is in a low vacuum state, and the pipeline wind speed is about 10-35 meters per second. The material is in a misty state inside the pipeline. The starting pressure of negative pressure conveying is equal to or close to atmospheric pressure, and the ending pressure is between -10 and -50Kpa. The vacuum degree of the pipeline gradually increases along the pneumatic conveying pipeline.

　　负压稀相气力输送系统主要由：气力输送风机、取料装置、管道、缓冲仓、除尘器、卸料装置、等构成。

　　The negative pressure dilute phase pneumatic conveying system mainly consists of: pneumatic conveying fan, material retrieval device, pipeline, buffer bin, dust collector, unloading device, etc.

　　负压稀相气力输送系统的特点：

　　Characteristics of negative pressure dilute phase pneumatic conveying system:

　　1.输送压力低于环境压力，即使管道破损也不会使物料泄漏而对环境造成污染；设备的制造、维护要求低，工人操作简单；

　　1. The conveying pressure is lower than the ambient pressure, and even if the pipeline is damaged, it will not cause material leakage and pollution to the environment; The manufacturing and maintenance requirements of the equipment are low, and the worker operation is simple;

　　2.输送气体（一般为空气）直接取自大气，气体的温度即为环境温度，对热敏性物料尤为适宜；输送为连续式、亦可间断，管道内无物料积存；

　　2. The transported gas (usually air) is directly taken from the atmosphere, and the temperature of the gas is the ambient temperature, which is particularly suitable for thermosensitive materials; The transportation is continuous or intermittent, and there is no material accumulation in the pipeline;

　　3.可实现多点进料，多点卸料；气体动力源一般为离心抽风机、罗茨真空泵、真空泵，使用寿命长；对输送物料的适应强，粉料、颗粒料均可顺利输送，环境污染小。

　　3. It can achieve multi-point feeding and multi-point unloading; Gas power sources are generally centrifugal fans, Roots vacuum pumps, and vacuum pumps, which have a long service life; Strong adaptability to conveying materials, both powder and granular materials can be transported smoothly, with minimal environmental pollution.

　　负压气力输送适合输送以下类型的物料：

　　Negative pressure pneumatic conveying is suitable for conveying the following types of materials:

　　粉状物料：如面粉、水泥、粉煤灰、滑石粉、药粉等。这类物料流动性好，但易扬尘，负压输送可有效减少粉尘外泄，保持环境清洁。

　　Powdered materials: such as flour, cement, fly ash, talcum powder, medicinal powder, etc. This type of material has good fluidity, but is prone to dust. Negative pressure conveying can effectively reduce dust leakage and maintain environmental cleanliness.

　　颗粒状物料：如塑料颗粒、粮食（小麦、大豆、玉米）、化肥、盐、糖等。需注意颗粒的硬度和磨损性，避免管道磨损。

　　Granular materials: such as plastic pellets, grains (wheat, soybeans, corn), fertilizers, salt, sugar, etc. Attention should be paid to the hardness and wear resistance of particles to avoid pipeline wear.

　　轻质物料：如泡沫颗粒、羽绒等。负压输送可利用较低的气流速度实现输送，减少对物料的损伤。

　　Light materials: such as foam particles, down, etc. Negative pressure conveying can utilize lower airflow velocity to achieve conveying and reduce damage to materials.

　　有毒、易燃易爆物料：如化工粉末、金属粉末等。负压输送系统密闭性好，可降低物料泄漏风险，提高安全性。

　　Toxic, flammable and explosive materials: such as chemical powders, metal powders, etc. The negative pressure conveying system has good airtightness, which can reduce the risk of material leakage and improve safety.

　　高附加值物料：如锂电池材料、纳米材料等。负压输送可减少物料与外界环境的接触，保护物料品质。

　　High value-added materials: such as lithium battery materials, nanomaterials, etc. Negative pressure conveying can reduce the contact between materials and the external environment, protecting the quality of materials.

　　不适合负压气力输送的物料：

　　Materials not suitable for negative pressure pneumatic conveying:

　　高湿度或粘性物料：如湿污泥、黏土、糖浆等。这类物料易结块，可能导致管道堵塞。

　　High humidity or viscous materials: such as wet sludge, clay, syrup, etc. This type of material is prone to clumping, which may cause pipeline blockage.

　　易碎或热敏性物料：如膨化食品、脆性晶体、某些药品等。负压输送的气流可能对这类物料造成破碎或变性。

　　Fragile or heat sensitive materials: such as puffed foods, brittle crystals, certain drugs, etc. The airflow of negative pressure conveying may cause breakage or denaturation of such materials.

　　超大或超重颗粒：如直径大于50mm的矿石块等。此类物料不适合气力输送，需采用机械输送方式。

　　Oversized or overweight particles: such as ore blocks with a diameter greater than 50mm. This type of material is not suitable for pneumatic conveying and requires mechanical conveying.

　　注意事项：实际应用中，需根据物料特性（如粒径、湿度、流动性）和输送需求（距离、流量）选择合适的输送方式。对于特殊物料，建议进行物料试验，以确保系统设计的准确性。

　　Attention: In practical applications, it is necessary to choose the appropriate conveying method based on the material characteristics (such as particle size, humidity, fluidity) and conveying requirements (distance, flow rate). For special materials, it is recommended to conduct material testing to ensure the accuracy of system design.

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