CN2386413Y

CN2386413Y - Finned tube coal saver having nickel-base coating on surface

Info

Publication number: CN2386413Y
Application number: CN 99222138
Authority: CN
Inventors: 孙云凤; 孙奉仲; 李淑英; 王元昌; 黄新元; 杜轶鲲
Original assignee: Jinan Pressure Vessel Factory
Current assignee: Jinan Pressure Vessel Factory
Priority date: 1999-08-30
Filing date: 1999-08-30
Publication date: 2000-07-05
Anticipated expiration: 2009-08-30

Abstract

The utility model relates to a finned pipe coal economizer with the surface of a nickel base leakage layer, which is composed of a base pipe and a fin, wherein, the fin is wound on the base pipe in a spiral mode. The wound contact position of the base pipe and the fin are welded and melted to the integration, and thereby, the contact resistance can be eliminated completely. The surfaces of the base pipe and the fin are both covered with the nickel base leakage layer. The utility model has the characteristics of corrosion resistant and rub resistance, and can shorten the length of the base pipe in the precondition of without influencing heat transfer. The utility model can increase the corrosion prevention and rub resistance performance of the surfaces of the pipe and the fin, enhance the service life of a coal economizer, and can reduce the loss caused by equipment maintenance.

Description

There is the finned tube economizer 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 economizer is to be made by light pipe mostly, some is a band cast iron fin, 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 economizer 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 economizer is directly exposed in the coal dust flying dust, be corroded and wear rate 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, the heat-transfer capability in service life all is restricted.The dust stratification of the economizer of band cast iron fin is more serious.

This practical purpose provides a kind of surface nickel-base seeping layer finned tube economizer, and it can increase anticorrosion, the abrasionproof performance of fin and tube-surface, and it is long-pending to have expanded outer tube surface, 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 nickel-base seeping layer at the exposed surface of parent tube and fin.

The utility model is made up of parent tube and fin, and the soldering processes under the inert gas shielding are adopted in the welding of parent tube and fin, 100% rate of deposition is arranged, thereby can significantly strengthen the heat-transfer capability that is made economizer by this finned tube; In addition, in soldering, form one deck nickel-base seeping layer at fin surface, its case hardness is more than 2 times of carbon steel.Add the boundary effect when fluid flows through fin, make this economizer have excellent abrasionproof.Because the surface of nickel-base seeping layer can be low on the finned tube, can alleviate the dust stratification of economizer 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 economizer, transmitting its total length of tube of same heat can shorten dramatically, and is about 1/4 of light pipe economizer 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 economizer 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;

Fig. 2 is 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.

In the drawings, fin 2 is spirally wound on the parent tube 1 through machinery, pipe 1 generally should be made snakelike tubulose, be provided with swan neck 3 at its turning, fin 2 twines the contact position on parent tube 1 should make them be melt into one through soldering, at the outer surface of parent tube 1, swan neck 3 and fin 2 Ni-based abrasionproof infiltration layer 4 is arranged all.Elbow 3 is difficult for around last fin because will pass through bending technique, so can be light pipe, allows as manufacturing conditions, also can be wound with fin 2.

Claims

1, there is the finned tube economizer of nickel-base seeping layer on a kind of surface, is made up of parent tube, fin and elbow, it is characterized in that being wound with helical fin (2) on parent tube (1) outer wall, all is coated with nickel-base seeping layer on the surface of parent tube (1) and fin (2).

2, finned tube economizer according to claim 1 is characterized in that the root of fin (2) and the contact position of parent tube (1) should be the soldering all-in-one-piece.