Ceramic-lined elbow for power plants
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Ceramic-lined elbows used in power plants are primarily employed to replace worn elbows in the ash storage and handling systems. In thermal power plants, one-third of the pipes in the ash transportation systems suffer from wear and leakage, and repairing them by welding is particularly difficult; this leads to environmental pollution. Based on years of production experience, the use of ceramic-lined elbows results in a service life similar to that of steel pipes, with some ceramic elbows even having a longer lifespan than steel pipes. The common specifications for ceramic-lined elbows used in power plants are elbows with diameters of dn100, dn125, and dn150. For example, 90o, R600, DN100; 100 mm of weld allowance is reserved at each end. The elbow is replaced due to wear, and 121 steel pipes with a wall thickness of 8 mm and a ceramic lining of 4 mm are used. 100 mm of straight welding sections are required at each end to facilitate welding to the steel pipes.
Introduction to ash transfer wear-resistant pipes: Ash transfer pipelines generally use ceramic pipes, while ceramic composite pipes are manufactured using a high-tech production process – the self-propagating high-temperature synthesis method. This tube is composed of three layers from the inside out: corundum ceramic, a transition layer, and steel. The ceramic layer is dense corundum porcelain (AL2O3) formed at high temperatures above 2200°C, and it forms a strong bond with the steel pipe through the transition layer.
Processing technique for wear-resistant materials: (1) Place the wear-resistant adhesive and corundum ceramic powder (solid granular material) into a clean bucket at a volume ratio of 1:4, then stir until a semi-fluid, semi-solid binder is formed； (2) Apply with a trowel on the windward side of the elbow (inside the backpack box), with a thickness of 15 mm ； Reconstructing the work. (3) Fill the backpack box with corundum ceramic wear-resistant material, smooth it out with a trowel, and let it sit for 20–30 minutes to allow it to settle naturally. Check to see if it is fully filled; if so, proceed with the next steps, otherwise add more wear-resistant material. (5) Seal it with an arc-shaped cover plate, and weld it to the side plates and end plates to form a backpack shape.