CN2456027Y - Rib-pipe reheater with nickel surface treatment - Google Patents

Abstract

The utility model relates to a fin-tube reheater with a nickel-base coating surface, which comprises tubes and fins. The utility model is characterized in that a fin (2) is wound on a base tube (1). The outer surfaces of the tubes (1 and 3) and the fin (2) are all provided with a nickel-base anti-wearing mixing layer (4). The utility model has favorable corrosion resistant and wear resistant characteristic, and can shorten the length of the base tube under the precondition of without influencing heat transfer. The utility model can increase the corrosion resistant and wear resistant performances of the surfaces of the tubes and the fins, enhance the service life of a reheater, and reduce the loss caused by equipment maintenance.

Description

There is the finned tube reheater of nickel-base seeping layer on the surface

The utility model belongs to boiler plant, particularly relates to the device of utilization and recovery boiler fume afterheat.

Existing boiler reheater is to be made by light pipe mostly, some is made for the ratio-frequency welding finned tube, because the coal dust flying dust is big in the boiler exhaust gas road, make its surface exist the dust stratification etching problem, and the molecule in the flue dust washes away the reheater outer wall for a long time, and the abrasionproof performance of its outer surface has been proposed requirement.And the tube wall of light pipe reheater is directly exposed in the coal dust flying dust, and being corroded property and wear rate are higher, and its total length of tube is long, makes the side flow resistance of the resistance of in-pipe flow and flue gas big, and the heat-transfer capability in service life all is restricted.The dust stratification of ratio-frequency welding finned tube reheater and wearing and tearing are more serious.

This practical purpose provides a kind of surface nickel-base seeping layer finned tube reheater, and it can increase anticorrosion, the abrasionproof performance of fin and tube-surface, has expanded the reheater external surface area, and transmitting its total length of tube of same heat can shorten dramatically.

The purpose of this utility model realizes by the following technical solutions: be wound with helical fin on parent tube, the root that fin twines should contact fully with parent tube, its contact position should make them be melt into one through soldering, thereby eliminated thermal contact resistance fully, all should be coated with Ni-based layer infiltration layer at the exposed surface of parent tube and fin.

The utility model comprises pipe and fin, and pipe welds together with fin, and the rate of deposition between them should reach 90-100%, adopts the soldering processes under the inert gas shielding, thereby can significantly strengthen the heat-transfer capability of being made reheater by this finned tube; In addition, in soldering, form the Ni-based layer of mixing of one deck at fin surface, its case hardness is more than 4 times of carbon steel.Add the boundary effect when fluid flows through fin, make this reheater have excellent abrasionproof.Because the surface of nickel-base seeping layer can be low on the finned tube, can alleviate the dust stratification of reheater effectively, thereby reduce corrosion tube wall, this improves boiler efficiency to reducing exhaust gas temperature, and very positive effect is arranged.Because it is long-pending that outer tube surface has been expanded in the adding of fin, compare with the light pipe reheater, transmitting its total length of tube of same heat can shorten dramatically, and is about 1/4 of light pipe reheater approximately only, can reduce the resistance of in-pipe flow and the side flow resistance of flue gas.

The utility model is to have good anticorrosive, wear-resisting wiping characteristic, under the prerequisite that does not influence heat transfer, can shorten the length of parent tube greatly, increase surface anticorrosion, the abrasionproof performance of pipe and fin, improve reheater service life, reduce the loss that brings because of maintenance of equipment.

The utility model is described in further detail below in conjunction with accompanying drawing and by embodiment:

Fig. 1 is the contour structures schematic diagram of the utility model embodiment;

Be illustrated as local axle section (amplification) figure of Fig. 1.

Among the figure: the 1st, parent tube, the 2nd, fin, the 3rd, swan neck, the 4th, nickel-base seeping layer pipe.

In the drawings, the fin face revolves through machinery and is wrapped on the parent tube 1, parent tube 1 generally should be made snakelike tubulose, be provided with swan neck 3 at its turning, fin 2 is wrapped on the parent tube 1, the contact position should make them be melt into one through soldering, should all have Ni-based abrasionproof to mix layer 4 at the outer surface of parent tube 1, swan neck 3 and fin 2.Elbow 3 is difficult for around last fin because will pass through bending technique, thus can be light pipe, but, the abrasionproof cover is set on its surface for increasing abrasionproof.Allow as manufacturing conditions, also can twine fin 2.

Claims (4)

1, there is the finned tube reheater of nickel-base seeping layer on a kind of surface, comprises pipe, fin, it is characterized in that fin (2) is wrapped on the parent tube (1), all has Ni-based abrasionproof to mix layer (4) at the outer surface of parent tube (1) and fin (2).

2, finned tube reheater according to claim 1 is characterized in that being provided with swan neck (3) at parent tube (1) turning, and swan neck (3) can be light pipe, also can twine fin (2).

3, finned tube reheater according to claim 2 is characterized in that swan neck (3) outer surface should have Ni-based abrasionproof to mix layer (4).

4,, it is characterized in that the fin (2) and the contact position of pipe (1,3) should be the soldering all-in-one-pieces according to claim 1,2 or 3 described finned tube reheaters.

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