B209 DEVELOPMENT OF ANTI-ABRASION ELBOWS FOR HIGH-VELOCITY PARTICLE-LADEN GAS FLOWS(Gas turbine & forced convection heat transfer)

概要

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A study on the improvement of anti-abrasion nature of elbows for high-velocity particle-laden gas flows, which are typically equipped in coal-burned power plants has been carried out. At present, a coal-burned steam power plant produces many coal ash particles (i.e., SiO_2, Al_2O_3) after combustion. In the high velocity transport of these brittle particles, severe abrasion occurs due to the collision with the wall of the elbows. To reduce the abrasion of pipe, we have tried to form the vortex flow field in the region where the flow changes its direction, using two different shapes, 45° and 90° elbows. The numerical analysis for design of anti-abrasive elbows has been conducted. The governing equations for three-dimensional, turbulent flow fields are discretized by FVM and solved by SIMPLE algorithm. Also, the simulation of solid-gas flows has been conducted. For the sake of proving the numerical results, the newly developed 90° elbow has been installed in one of the operating steam power plants in Korea. Numerical results are compared with the experimental abrasion data. This comparison shows that the developed elbows have much more durability than the original one.
一般社団法人日本機械学会の論文
2000-10-01