文章來源： 作者：羅茨機電 發布時間：2022-05-13 瀏覽次數：486
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.
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.
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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