负压气力输送系统（也称负压风送系统或负压风运输送系统）是高压离心风机产生的真空将散装粉粒体物料用负压气流吸送到指定的容器（料仓），负压吸送式气力输送装置为核心组成的真空负压收集系统，特别适用于短距离、物料温度高、多点卸料的系统中。

The negative pressure pneumatic conveying system (also known as the negative pressure air conveying system or negative pressure air conveying system) is a vacuum generated by a high-pressure centrifugal fan that sucks bulk powder materials into a designated container (silo) using negative pressure airflow. The negative pressure suction pneumatic conveying device is the core component of the vacuum negative pressure collection system, especially suitable for short distance, high material temperature, and multi-point unloading systems.

负压吸送气力输送设备散装物料抽吸机由吸嘴、液压吸臂、分离卸料装置、鼓风机(真空泵)、电控系统等组成。可直接或通过输送机械将物料送入散装物料库(仓)。散装物料气力输送系统由负压气力输送设备(吸嘴、液压吸臂、分离装置、鼓风机或真空泵)和正压气力输送设备(仓式泵、组合泵、空气压缩机)以及电控系统组成。

The negative pressure suction pneumatic conveying equipment for bulk material suction is composed of a suction nozzle, a hydraulic suction arm, a separation and unloading device, a blower (vacuum pump), an electrical control system, etc. Materials can be directly or through conveying machinery into bulk material warehouses (silos). The bulk material pneumatic conveying system consists of negative pressure pneumatic conveying equipment (suction nozzle, hydraulic suction arm, separation device, blower or vacuum pump) and positive pressure pneumatic conveying equipment (bin pump, combination pump, air compressor) as well as an electrical control system.

负压吸送式气力输送原理

The principle of negative pressure suction pneumatic conveying

负压吸送式气力输送的流化仓是利用空气使粉煤灰颗粒能够充分地形成流态化状态，从而使粉煤灰能够顺利地进入负压吸灰正压输送管道。负压吸灰流化仓内部是由两块多孔薄钢板组成的，在上下多孔板之间夹有透气层。整个流化仓内部的多孔板按一定斜度（4%-10%）布置。粉煤灰由分离器进入组合泵，由组合泵进入流化仓，加料设备加入上壳体的加料口的透气层上。空气由流化仓进入入下壳体，并沿流化仓透过透气层，使粉煤灰流态化。进入输送机械送出或进入正压输送设备内，由空气压缩机或罗茨风机产生的正压，经过送料管道，将物料送入散装物料库(仓)。而清洁的空气则由分离器上部排出经排风管道，从罗茨鼓风机(真空泵)排气口排入大气。

The fluidized bin of negative pressure suction pneumatic conveying utilizes air to fully form a fluidized state of fly ash particles, so that fly ash can smoothly enter the negative pressure suction positive pressure conveying pipeline. The interior of the negative pressure ash suction fluidized bed is composed of two porous thin steel plates, with a breathable layer sandwiched between the upper and lower porous plates. The porous plates inside the entire fluidized bed are arranged at a certain slope (4% -10%). The fly ash enters the combined pump through the separator, and then enters the fluidized bin through the combined pump. The feeding equipment is added to the breathable layer of the feeding port of the upper shell. The air enters the lower shell through the fluidized bed and passes through the breathable layer along the fluidized bed to fluidize the fly ash. The positive pressure generated by the air compressor or Roots blower enters the conveying machinery to deliver or enter the positive pressure conveying equipment. Through the feeding pipeline, the material is sent to the bulk material warehouse (warehouse). And clean air is discharged from the upper part of the separator through the exhaust duct, and is discharged into the atmosphere through the exhaust port of the Roots blower (vacuum pump).

吸送式气力输送设备组成：

Composition of suction pneumatic conveying equipment:

负压吸送装置的主要组成部件为分离器，吸嘴（分固定式吸嘴和可移动式吸嘴），卸料器，真空泵，阀门及管件，控制系统等，适用于粉状物料的中短距离输送。由于输送过程全部是在密闭的负压管道中完成，所以在输送线路上不会产生任何泄漏和污染，尤其适用于有严格泄漏污染要求的有害物质的输送。输送系统既可以单点供料，也可以多点供料，工艺布置灵活方便。

The main components of the negative pressure suction device are the separator, suction nozzle (divided into fixed suction nozzle and movable suction nozzle), unloader, vacuum pump, valve and pipe fittings, control system, etc., suitable for medium and short distance transportation of powdered materials. Due to the fact that the entire transportation process is completed in a closed negative pressure pipeline, there will be no leakage or pollution on the transportation line, especially suitable for the transportation of harmful substances with strict leakage and pollution requirements. The conveying system can provide both single point and multi-point feeding, with flexible and convenient process layout.

负压吸送式气力输送装置系统优势：

Advantages of negative pressure suction pneumatic conveying device system:

输送管道中压力低于环境压力，粉尘不向外泄漏，是输送有毒性物料的选择，常用于卸船、真空上料、清洁等应用。适合多点到一点的输送。输送线路为负压管路状态，输送过程中无泄漏，无污染；输送状态为均匀连续，输送量可以调节；气源装置采用干式负压气源，简单可靠；分离装置采用过滤材料和脉冲喷吹，结构紧凑，分离效率高；吸嘴装置可根据不同的应用场合和工艺要求进行专门设计；输送系统的设备配置简单，系统投资小；系统维护量低，检修方便。

The pressure in the conveying pipeline is lower than the environmental pressure, and dust does not leak out. It is the best choice for transporting toxic materials and is commonly used in applications such as unloading ships, vacuum loading, and cleaning. Suitable for conveying from multiple points to one point. The conveying line is in a negative pressure pipeline state, and there is no leakage or pollution during the conveying process; The conveying state is uniform and continuous, and the conveying amount can be adjusted; The air source device adopts a dry negative pressure air source, which is simple and reliable; The separation device adopts high-efficiency filtering materials and pulse injection, with a compact structure and high separation efficiency; The suction nozzle device can be specially designed according to different application scenarios and process requirements; The equipment configuration of the conveying system is simple, and the system investment is small; Low system maintenance and convenient maintenance.

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