气力输送管道易发生磨损的原因是在管道输灰过程中，由于输送介质的颗粒有体积大小、硬度强弱之分，在输送过程中在压缩空气的带动下，与管道内壁发生碰撞摩擦，加之管道也会有弯管，在气场作用下，物料进过弯管时所产生的碰撞更加激烈，因此，管道的内壁会受到磨损，若想减轻管道磨损现象，可通过以下方法。选择输送管道尽量选取高质量、加厚、耐磨的管道，在弯道处可采用内衬陶瓷的耐磨弯头。在布置管道时，合理安排管道的排列，保证正常工作的前提下，尽量减少弯管的数量。输灰管道中输送粉煤灰时，灰质颗粒的大小和原煤的燃烧程度也有关系，煤中含有杂质少，燃烧更充分，产生的灰尘颗粒更细小，在通过管道时产生的摩擦力也会降低，可相应减少管壁的磨损度。

The reason why the pneumatic conveying pipeline is prone to wear is that during the ash conveying process, the particles of the conveying medium can be divided into size and hardness. In the conveying process, driven by compressed air, they collide and rub with the inner wall of the pipeline. In addition, the pipeline will also have bends. Under the action of the gas field, the collision caused by the materials entering the bends will be more intense. Therefore, the inner wall of the pipeline will be worn. If you want to reduce the wear of the pipeline, The following methods can be used. Select high-quality, thickened and wear-resistant pipes as far as possible, and wear-resistant elbows lined with ceramics can be used at bends. When arranging pipes, arrange the pipes reasonably to minimize the number of bends on the premise of ensuring normal operation. When conveying fly ash in the ash conveying pipeline, the size of gray matter particles is also related to the combustion degree of raw coal. The coal contains less impurities, burns more fully, produces finer dust particles, and the friction generated when passing through the pipeline will also be reduced, which can reduce the wear degree of pipe wall accordingly.

由于磨损是物料与壁面不断摩擦或碰撞引起的，所以物料的粒度越大、硬度越高、速度越快、摩擦和碰撞的能量就越大，磨损就越严重。磨损的快慢大致与输送气流速度的幂次方成正比。另外，浓度越大，摩擦或碰撞次数越多，磨损亦越严重。减少磨损的方法，首先是要合理设计输料管，尽量减少弯头、水平段和倾斜段；要保持输料管，不变形，连接处要对中，尽量减少管道内部的台阶和错位。必要时可在容易磨损的部位加衬耐磨材料。

Because the wear is caused by the constant friction or collision between the material and the wall, the larger the particle size of the material, the higher the hardness, the faster the speed, the greater the energy of friction and collision, and the more serious the wear. The speed of wear is roughly proportional to the power of the conveying air velocity. In addition, the higher the concentration, the more times of friction or collision, and the more serious the wear. The first way to reduce wear is to reasonably design the conveying pipe and minimize the elbow, horizontal section and inclined section; The feeding pipe shall be kept free of deformation, and the connection shall be centered to minimize the steps and dislocation inside the pipe. If necessary, wear-resistant materials can be lined at the easily worn parts.

管道堵塞也是气力输灰系统中常见的故障之一，管道的堵塞会严重影响系统的正常运行，因此我们要注意检查预防。气力输灰系统运行过程中，由于操作不当，会造成物料料的沉积，引起管道的堵塞，更容易发生阻塞的地方是管道的弯管（弯头处）和较长的水平管段，检查管道是否堵塞，可用铁器敲击管壁，声音冷脆表示未阻塞，声音沉闷表示已阻塞，若管道被阻塞，带动风机的电动机电流便会急剧下降。发生管道阻塞现象时，要采取以下方法排除：用铁器敲击管道的底部和侧部，使管道内沉积的物料振动并被气流带走。在弯管或水平管上开设透气孔，正常运行的时候封闭，发生阻塞的时候阻塞处的透气孔打开，让外界的空气进入，同时敲击管壁，使沉积物被气流带走。

Pipeline blockage is also one of the common faults in pneumatic ash conveying system. Pipeline blockage will seriously affect the normal operation of the system, so we should pay attention to inspection and prevention. During the operation of the pneumatic ash conveying system, improper operation will lead to the deposition of materials and the blockage of the pipeline. The places where the blockage is more likely to occur are the elbow (elbow) of the pipeline and the long horizontal pipe section. Check whether the pipeline is blocked. Knock the pipe wall with an iron tool. The cold and crisp sound indicates that it is not blocked, and the dull sound indicates that it is blocked. If the pipeline is blocked, the motor current driving the fan will drop sharply. In case of pipeline blockage, the following methods shall be adopted: knock the bottom and side of the pipeline with an iron tool to make the materials deposited in the pipeline vibrate and be taken away by the air flow. Vent holes shall be set on the elbow or horizontal pipe, which shall be closed during normal operation. When blocking occurs, the vent holes at the blocking position shall be opened to allow outside air to enter. At the same time, the pipe wall shall be knocked to take away the sediment by the air flow.

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