Profile anti-wear plate for water cooling wall of CFB (Circulating Fluid Bed) boiler

Abstract

The invention relates to a wear prevention technology for a circulating fluid bed boiler, in particular to a profile anti-wear plate for a water cooling wall of a CFB (Circulating Fluid Bed) boiler. The anti-wear plate comprises a bottom edge, an outer edge and two side edges, wherein two or more inner arcs correspondingly matched with the outer diameter of water cooling wall pipes are formed at the bottom edge side by side; the angle of each inner arc is less than 180 degrees; the circle centers of the inner arcs are located on the outer side of the bottom edge; the circle center distance between every two adjacent inner arcs is equal to the center distance between every two adjacent water cooling wall pipes; joints of the inner arcs and the bottom edge are chamfered; the outer edge comprises two or more outer arcs; the outer arcs and the inner arcs have the same circle centers; an intersection of every two adjacent outer arcs is filleted; a distance from each side edge to the circle center of the adjacent inner arc is greater than 1 / 2 of the circle center distance between every two adjacent inner arcs; and a connection distance between each side edge and each outer arc is greater than 1 / 2 of a connection distance between every two adjacent outer arcs. The profile anti-wear plate disclosed by the invention can save materials and reduce the cost, further has the effects of improving the heat exchange efficiency and not affecting protection for the water cooling wall, and further achieves the effects of saving energy and reducing emission.

Description

Technical field [0001] The invention relates to an anti-wear technology of a circulating fluidized bed boiler, in particular to a profiling anti-wear plate of a CFB boiler water wall. Background technique [0002] Circulating fluidized bed combustion technology is a clean coal combustion technology highly recognized by the market. With its high efficiency, low pollution, strong adaptability to coal types, and good load controllability, it has been widely used and developed at home and abroad. The key to long-term safe and stable operation is how to prevent the water wall of the circulating fluidized bed boiler from wearing and bursting. At present, the anti-wear of the circulating fluidized bed boiler water wall mainly uses high-temperature spraying, additional anti-wear beams, and the currently popular high-chromium and high-nickel alloy plate anti-wear technology. These measures are in solving the problem of circulating fluidized bed boiler water wall wear. All played a very g...

AI Technical Summary

Problems solved by technology

[0003] From the perspective of fluid dynamic characteristics and fluidization theory in the furnace, the furnace of circulating fluidized bed boiler is in a state of rapid fluidization. From the top to the bottom of the furnace, the flow velocity, particle concentration and flux of the wall-adhering flow gradually increase. The temperature of the water-cooled wall is different from the middle of the furnace to the periphery of the furnace. The rapid drop of high-concentration and large-flux bed material in the furnace has caused erosion on the water-cooled wall. Although the wall-adhesive flow formed by the drop of bed material has strengthened The water-cooled wall exchanges heat, but it also wears the water-cooled wall

The existing anti-wear plate anti-wear technology is to destroy the flow velocity and flow direction of the wall-adhering flow particles, thus playing a good role in anti-wear, but to a certain extent, it affects the heat transfer of the heating surface and affects the efficiency of the boiler. High-temperature spraying anti-wear technology requires a lot of investment, and the service life is short. After falling off, it will cause local wear, and if it is not found in time, the tube will burst and the furnace will be shut down.

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