CN2289114Y

CN2289114Y - High efficiency stainless steel bellows

Info

Publication number: CN2289114Y
Application number: CN 97240802
Authority: CN
Inventors: 曹肄; 杨从林
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-05-12
Filing date: 1997-05-12
Publication date: 1998-08-26
Anticipated expiration: 2007-05-12

Abstract

The utility model relates to a high efficiency stainless steel corrugated pipe which is suitable for a condenser in a thermal power plant. The corrugated pipe is characterized in that arc-shaped spiral corrugation which is bulged outwards is arranged on a pipe wall. The whole steel pipe is composed of a stainless steel belt which is rolled and welded. Because the stainless steel pipe is adopted; the spiral corrugation is also arranged, the heat transfer coefficient of the pipe is enhanced 20-25%. The utility model has the advantages of low cost, enhancement of corrosion resistance of the pipe, mud erosion resistance property, difficult scaling, anti-vibration, reinforcement of mechanical property, convenient installation and utilization. The utility model can replace a light copper pipe used in the existing condenser.

Description

Efficient stainless steel wave screwed pipe

The utility model relates to a kind of efficient stainless steel wave screwed pipe with high heat exchanger efficiency that is suitable for using in the vapour condenser of thermal power plant, is used for the exhaust steam that steam turbine is discharged cooled off condensing and recycling.

Vapour condenser is one of the vitals in thermal power plant, the good and bad ride quality that directly influences the power station of it and accessory performance thereof.The quality of vapour condenser performance depends on the performance of heat exchanging tube to a great extent, in order to improve exchange performance, existing mode is to adopt the various copper pipes of good heat conductivity, this has not only improved the cost of product greatly, and copper pipe also exists to corrosion resistances such as chlorion, ammonium ion, silts strong inadequately and low, the easy vibration of self intensity, the easy problem of fouling.

The purpose of this utility model is to provide a kind of cost low, the efficient stainless steel wave screwed pipe that performance is excellent.

The technological scheme that realizes the utility model purpose is as follows: be provided with the arc helical corrugation 3 to outer lug on the tube wall of Stainless Steel Tube 1.

According to such scheme, the fluidised form of circulating water in pipe formed by two kinds of motion mode superpositions, and the one, circulating water advances as spiral along inner tube wall; The one, be accompanied by convex place boundary layer separation and do vertically to flow, a kind of mode is main after the circulating water fluidised form in this ripple screwed pipe.Owing to have boundary layer separation flow, make the interior convection transfer rate of pipe to be improved the direct convection heat exchange of fluid and inner tube wall greatly.Simultaneously, owing to exist boundary layer separation flow also to make the sludge in the circulating water be difficult to be attached to inner tube wall and fouling.In the condensation heat transfer process outside pipe, because each corrugated surface is that circular arc is planar, and very smooth, water of condensation is difficult to absorption and very fast drippage at place, every ripple arc top, the formation dropwise condensation, this dropwise condensation also will improve greatly than the coefficient of heat transfer of film type condensation.The utility model whole heat transfer process when work comprises: the condensation heat transfer outside the pipe, the convection heat exchange in the heat conduction of tube wall and the pipe.Because the main thermal resistance of this process comes from convection heat exchange and the outer condensation heat transfer of pipe in the pipe, and the thermal conduction resistance of tube wall is much smaller than sum of the two, according to this mechanism, the utility model adopts the relatively poor stainless steel material of thermal conductivity to replace the good copper material of thermal conductivity, has produced following good effect:

1. employing the utility model, its heat-transfer coefficient has improved 20-25%;

2, helical corrugation is set, less scaling in the pipe:

3, owing to adopt stainless steel pipe, strengthened anti-ammonia erosion, resisting corrosion of chlorine ion, the ability of anti-silt erosion greatly prolongs working life, and cost then greatly descends;

4, owing to adopt Stainless Steel Tube, improved mechanical property, strengthened the antivibration ability, simultaneously, installed and changed convenient.

Accompanying drawing is an embodiment's of the utility model a whole-cutaway view.

An embodiment of the present utility model as shown in drawings; Stainless Steel Tube 1 is a welded stainless steel pipe; can be welded by the Stainless Steel Band turnup; promptly be pressed into the pipe of certain diameter by the continuous turnup of Stainless Steel Band; thereafter no medicine melting welding becomes light pipe and heat-treats under air protection; use the moulding of mould roll extrusion helical corrugation again; two of Stainless Steel Tube is a light pipe section 2; length is generally 10-20mm; connect so that carry out other parts of expand tube and vapour condenser, the continuous arc helical corrugation 3 to outer lug is all arranged on the other parts tube wall, use little round-corner transition between each helical corrugation; the specification D=25 of Stainless Steel Tube * 7mm in the present embodiment; the height of projection of helical corrugation is 0.8mm, and pitch is 8mm, helixangle=86 °; the radius of arc of helical corrugation is 5-6mm, and light should be polished in whole Stainless Steel Tube outside.

Claims

1, a kind of efficient stainless steel wave screwed pipe is characterized in that being provided with the arc helical corrugation (3) to outer lug on the tube wall of Stainless Steel Tube (1).

2, by the described efficient stainless steel wave screwed pipe of claim 1, it is characterized in that Stainless Steel Tube (1) is a welded stainless steel pipe, is welded by the Stainless Steel Band turnup.

3, by claim 1 or 2 described efficient stainless steel wave screwed pipes, the two that it is characterized in that Stainless Steel Tube is light pipe section (2).

4, by claim 1 or 2 described efficient stainless steel wave screwed pipes, it is characterized in that the continuous arc helical corrugation (3) to outer lug is arranged on the tube wall, use little round-corner transition between each helical corrugation.

5,, it is characterized in that to polish light outside the whole stainless steel by claim 1 or 2 described efficient stainless steel wave screwed pipes.