Impact position of coal powder wear-resistant elbow
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The coal dust concentration distribution within the 90° elbow in the powder supply pipeline shows that the area most affected by dust erosion is located on the outer arc of the elbow, near the wall surface, as well as near the outlet of the elbow – not at the point where the centerline of the wear-resistant elbow fitting intersects with the outer arc surface of the elbow. Suggestions are provided for the structural design of the welding lift plates on the pipe sections of support and hanger fittings in thermal power plants. If site conditions are limited, it is also feasible to design the welding lift plate structure at the intersection of the centerline of the wear-resistant elbow fitting’s inlet pipe and the outer curved surface of the elbow; this will not affect the service life of the wear-resistant elbow due to wear caused by particle erosion.
Use elbows with a larger radius of curvature.
The wear-resistant elbow of the new type of pneumatic ash conveying pipe consists of an elbow and a filling cover that is attached to the outer wall of the elbow. The elbow is a hollow curved tube with open ends at both ends; ribs are provided on the outer side of the circumferential walls on both sides of the elbow’s axis. The length of these ribs is the same as that of the elbow, and their curvature matches that of the elbow. A filling cover wraps around the outer surface of the elbow’s protruding part, with its sides connected to the ribs; the filling cover is filled with a filler material. The backpack’s wear-resistant elbow features a new type of sealing cover; both the elbow and the cover are made of steel pipes, which ensures even distribution of the wear-resistant filling material, preventing it from falling out after filling. Fillers are common materials with low costs. The filler has a thickness of over 100 px, offering excellent wear resistance and a long service life** – this reduces the need to replace or repair wear-resistant elbows, lowers costs, and decreases the workload for workers. The wear-resistant elbow for backpacks is a version of the standard wear-resistant elbow, with an additional wear-resistant layer added to the outside of the elbow. This outer layer is made by welding steel plates together, with a wear-resistant mixture filled inside in order to achieve high wear resistance. Such elbows are now widely used in industries subject to heavy wear, such as power plant ash removal systems, coal washing plants, and ore processing plants.
High-speed wear is a difficult problem to address in pneumatic conveying.
Since the impact point of the elbow is on the back arc, in addition to the wear-resistant ceramic composite elbow, an additional wear-proof layer is added to the back arc; the elbow has a ceramic lining while the outer layer is lined with wear-resistant material, providing a double-layer wear protection system that is suitable for areas subject to severe wear. The wear-resistant elbow for backpacks significantly extends the service life of the elbow in areas where it is subject to severe impact. It reduces the cycle time and costs for maintenance and replacement.
Manufacturer’s design plan for ceramic-lined wear-resistant elbows: 13784738960. http://www.bhgdzb.com/ Ceramic-lined wear-resistant elbows should be designed and manufactured in accordance with the YB/T176-2000 standard, which specifies the product classification, codes, dimensions, shape, weight, technical requirements, testing methods, inspection rules, as well as labeling, packaging, transportation, storage, and certification procedures for ceramic-lined composite steel pipes. The standard applies to ceramic steel pipes manufactured by the thermite-centrifugation method. Ceramic-lined composite steel pipe: The design specifications for the DN100 ceramic-lined wear-resistant elbow are as follows: 1. Thickness of the wear-resistant ceramic lining: 3.5–4 mm. 2. Aluminum oxide content in the ceramic lining: ≥95%. 3. Bending radius of the elbow: ≥6D; R = 750 mm. 4. Specifications for the accompanying straight pipe: φ121×8