The pulverized coal conveying pipelines of thermal power plant boilers are wear-resistant and require leak-proof, anti-corrosion, rain-proof, anti-freeze and other factors to be designed. The key points are anti-wear and anti-corrosion. The wear-resistant ceramic of pulverized coal pipelines are particularly severely worn. It has always been a key part of power plant maintenance. The comprehensive performance of the pipeline system, especially the wear resistance, is directly related to the operating cost and economic benefits of the entire power plant. It is an issue that must be considered during power plant engineering and maintenance.
Considering the wear resistance, high temperature resistance and anti-corrosion performance of the pipeline, and comprehensively considering the wear resistance solution based on the convenience of construction, lower manufacturing cost and relatively simple production process, Dongzhen lined wear-resistant ceramic sheets can solve the problem part of the puzzle. Huazhan wear-resistant ceramic sheets are special corundum ceramics made of AL2O3 as the main raw material, rare metal oxides as flux, and roasted at a high temperature of 1,700 degrees. Its Rockwell hardness is HRA80-90, and its hardness is second only to diamond. The wear resistance is equivalent to 266 times that of manganese steel and 171.5 times that of high chromium cast iron, so the service life of the pulverized coal pipeline elbow can be greatly extended.
The commonly used wear-resistant ceramic sheets for wear-resistant elbows of pulverized coal pipelines are welded ceramic sheets with holes in the middle and equipped with steel bowls and porcelain caps. This kind of wear-resistant ceramic sheet is also more convenient to construct. Use a heat-resistant steel bowl to directly weld the ceramic sheet with a tapered hole with a buckle to the steel body, and then use a buckle ceramic plug to apply glue and seal it in the conical shape of the ceramic sheet. On the hole, the overall appearance is all ceramic. This further strengthens the firmness of the ceramic sheet attached to the pulverized coal pipe. The advantage of this kind of ceramic sheet is that it is easy to repair and maintain. Even if the pipeline is worn during operation, it can be repaired directly, saving manpower and material resources.
Of course, in addition to welding ceramic sheets, there are also stud welding processes, self-igniting molding, wear-resistant ceramic pipes and other methods. This requires detailed analysis of the specific situation. At present, patch pulverized coal pipe elbows are widely used.
