Boiler water wall panel

Abstract

To attain a reduction of weld working load at the fabrication of boiler water wall panel and attain a reduction of maintenance load and enhancement of rate of operation for a furnace housing with built-in boiler water wall panel. Boiler water wall panel (80) comprises panel body (70) with water channel having constituent units of metallic seamless finned single tubes (60) integrally fabricated by hot extrusion technique, etc., these metallic seamless finned single tubes at the distal end of fin portion (62) welded and connected to each other as seam (71) and, provided on at least one surface side of the panel body (70), internal central region weld coating (82) and periphery weld coating (81) of anticorrosion alloy. The finned tube body (60) has tube body part (61) for cooling water channel and, extending on both sides thereof in the direction of tube body axial line, a pair of fin portions (62) wherein intervening portion (63) has an external surface formed into a concave curved surface of 3 to 6 mm curvature radius.

Description

technical field [0001] The present invention relates to a boiler water-cooled wall plate constituting a furnace shell chamber with cooling water passages. [0002] Boiler water-cooled wall plates are plate-tube composite plates, and are used as the main part when forming the wall plate of the shell chamber of the furnace (combustion chamber and heat exchanger) located in the heart of the hydrothermal boiler. The sheets are welded vertically and horizontally to form the furnace shell chamber. [0003] In order to improve the durability of the inner surface of the furnace shell, nickel self-fluxing alloy and other alloys are coated on one side of the boiler water wall plate. Background technique [0004] A method of heating a water-cooled plate segment having alternately arranged metal pipe portions and metal plate portions without causing thermal deformation is known (for example, refer to Patent Document 1). The structure and manufacturing method of this water-cooled panel...

AI Technical Summary

Problems solved by technology

Therefore, when the welding of the conversion part is not perfect, that is, when there is any one of poor welding such as pinholes, bumps, pores, welding spars, undercuts, slag inclusions, welding cracks, spatter, and very uneven weld shapes, etc. , these will become gaps, so the deposited coating of the corrosion-resistant alloy will be damaged starting from this place, and the base metal will be corroded prematurely.

[0017] It is difficult to judge the defect of the welded part visually, so it must be confirmed by a dye penetrant flaw detection test, etc., and the repair of the welded part where a defect is found requires TIG welding after shot blasting (cleaning), which is very troublesome

[0018] Moreover, the welding of the pipe body and the plate-shaped fins is much more difficult than welding the fin tips to each other, so welding defects are prone to occur although it takes man-hours. Therefore, not only the welding work itself is very burdensome Large, and the burden of subsequent inspection and repair is also large

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