CN202902964U

CN202902964U - Multistage crossover heat exchange tube

Info

Publication number: CN202902964U
Application number: CN 201220536516
Authority: CN
Inventors: 伊云清; 梁忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-10-18
Filing date: 2012-10-18
Publication date: 2013-04-24
Anticipated expiration: 2022-10-18

Abstract

The utility model discloses a multistage crossover heat exchange tube, and two ends of the multistage crossover heat exchange tube are respectively provided with a smooth tube section. The intermediate section of the multistage crossover heat exchange tube is of a multistage crossover stereo structure, spiral lines are mutually crossed to constitute the multistage crossover stereo structure, wherein three spiral lines are rotated clockwise along the tube body, parallel to one another, and have the same separation distance, and the other three spiral lines are rotated counterclockwise along the tube body, parallel to one another and have the same separation distance, and the three clockwise-rotary spiral lines and the three counterclockwise-rotary spiral lines are different in processing data. Crossover of the spiral lines can form three complete square structures in the direction perpendicular to the tube body, and the three square structures are identical in size. As the spiral lines are pressed and squeezed, the spiral lines are concave outside the tube and protruded inside the tube, and the square structures are protruded outside the tube and concave inside the tube. The multistage crossover heat exchange tube has the advantages of guaranteeing dirty-resistance, vibration-resistance, contaminant release and the like. Meanwhile, the multistage crossover heat exchange tube has a multistage flow turbulence effect, greatly improves heat exchange efficiency, and is mainly used in a condenser of a heat-engine plant.

Description

A kind of multi-stage cross heat exchanger tube

Technical field

The utility model relates to a kind of multi-stage cross heat exchanger tube, belongs to the heat transfer technology field.

Background technology

Condenser is one of Important Auxiliary equipment of steam turbine power generation unit, and its performance quality directly affects the operation of unit, and its main heat transfer component---cooling tube is the most important part of condenser, and price accounts for the over half of its total cost.The heat transfer coefficient of Effective Raise condenser how, topmost is exactly cooling tube, so the cooling tube type selecting is the design key of condenser.

As far back as 1958, power station, U.S. Xi Fuji river valley put into operation in the world that the First film-cooled heat is 5109m ²Stainless steel pipe condenser, the main manufacturer such as Japanese, European also brings into use stainless steel tube subsequently.

Because China uses the stainless steel pipe condenser starting than external late about 30 years, people are not extensive to this understanding yet, although stainless steel pipe is strong with its corrosion resistance, the advantages such as long service life are confirmed by practice, but itself because thermal conductivity factor make less than copper pipe general theory ratio of heat transfer coefficient copper pipe little 6%, few people are ready take a risk to use it.Till 2005, except minority 300MW unit adopted stainless steel, most units had all adopted copper pipe.

Under this condition, people can associate naturally, whether a kind of cooling tube can be arranged, and existing stronger corrosion resistance and service life, have again higher heat transfer coefficient.Emerged like this thermoexcell of large quantities of various means, comprising Multi-thread spiral channel heat-exchanging, rhombic intensified heat exchange tube, corrugated spiral heat exchanging tube, corrugated heat exchange tube for heat exchanger, helical corrugation heat exchange and fin etc.Logical practice is in a few years found spiral grooved tube some advantage aspect processing, heat exchange of single head, but also has two subject matters perplexing it that is exactly the problem of resistance to shock and afterwards scale removal of fouling.Because the features of shape of screwed pipe causes it to have spring effect, is unfavorable for antivibration, larger for its machining screw degree of depth of effect that reaches enhanced heat exchange simultaneously, cause afterwards not aspect cleaning of fouling, especially on large unit, affected greatly the continuation of operation.Also have some producers in order to pursue the high efficient heat exchanging effect, in pipe, add the device of spiral ribbon and so on, cause the shortcoming that to clean after the fouling, affected greatly the security of unit operation.

The utility model content

The utility model provides a kind of multi-stage cross heat exchanger tube, and by research, this heat exchanger tube uses and can make the aspects such as anti-tartar, scale removal, water resistance, antivibration, enhanced heat exchange comprehensively reach an optimum value in condenser.

Multi-stage cross heat exchanger tube of the present utility model is achieved through the following technical solutions:

At the two ends of described heat exchanger tube one section light pipe section is arranged respectively, be used for installing;

That the parallel and spacing of three of turning clockwise along the body direction equates that helix and spacing parallel with three that are rotated counterclockwise equates that helix intersects the multi-stage cross stereochemical structure of formation mutually at described heat exchanger tube interlude, spacing between the described parallel spires equates, but three helixes that turn clockwise are different with three the helix degree of depth, the width that are rotated counterclockwise.Intersecting at perpendicular to the body direction of helix can form three complete square structures, and three square sizes are the same.Because the compacting of helix extruding, it is recessed outside pipe to form helix, at the pipe inner process; Square is at the pipe outer process, and is recessed in pipe.

The intersecting angle a=90 of described helix °.

The angle b=45 of described helix and body vertical direction °.

In the described helix, working depth and the width of the helix of (or counterclockwise) rotation are respectively H clockwise ₁=0.5mm, R ₁=0.5mm; Working depth and the width of the helix of (or clockwise) rotation are respectively H counterclockwise ₂=0.8mm, R ₂=0.8mm.

The utility model adopts the advantage of such scheme to be:

(1) because different along the degree of depth and the width of contrary helix, forms multistage flow-disturbing, strengthened the effect of turbulent flow and eddy flow, effectively destroy static boundary-layer.

(2) under the prerequisite that guarantees anti-tartar, scale removal efficient, maximization improves heat exchange efficiency.

(3) multistage reinforcement body intensity is beneficial to antivibration.

Most importantly the utility model has significantly improved heat exchange efficiency when guaranteeing the aspect effects such as anti-tartar, antivibration, scale removal, comparing original light pipe can improve 40% heat exchange efficiency, and significance has been played in energy-saving and emission-reduction.

Description of drawings

Fig. 1 is the structural representation of heat exchanger tube;

Fig. 2 is the A-A cross section enlarged drawing of Fig. 1;

Fig. 3 is that heat exchanger tube shown in Figure 1 is cut flattening figure open along the B-B direction.

The specific embodiment

Further the utility model is described below in conjunction with accompanying drawing.

Multi-stage cross heat exchanger tube of the present utility model two ends are light pipe sections, three parallel and spacing equal helix be rotated counterclockwise three parallel and spacing equal helix the intersect to form multi-stage cross stereochemical structures of interlude for turning clockwise along the body direction.The process data of two groups of helixes is unequal, wherein the working depth H of one group of helix ₁=0.5mm, width R ₁=0.5mm, the working depth H of another group helix ₂=0.8mm, width R ₂=0.8mm.Two groups of helixes intersect to form three complete squares, and square in the same size.Because the compacting of helix extruding, it is recessed outside pipe to form helix, at the pipe inner process; Square is at the pipe outer process, and is recessed in pipe.Described projection and recessed all be for the tube wall of light pipe section.

Angle a=90 ° of intersecting of two groups of helixes; Two groups of helixes and body vertical direction angle b=45 °.

The multi-stage cross heat exchanger tube is to process on the light pipe basis, its working depth H ₂And H ₁Refer to relative light pipe body, foursquare projection does not count.

Described multi-stage cross heat exchanger tube is mainly used in the condenser, and other heat transmission equipments also can use according to actual conditions.The recommendation stainless steel, other metal materials are available equally.Welded tube, seamless pipe are applicable equally.

The different structure of process data (comprising the degree of depth and width) of the helix of the clockwise and counterclockwise both direction that the heat exchanger tube that the utility model provides adopts, when passing through, fluid can form more unordered turbulent flow, cause multistage flow-disturbing, larger destruction laminar flow increases heat transfer effect.If the working depth of left-and-right spiral line is the same, and width is the same, although can form disturbance, final flowing of forming also is that very strong regularity is arranged.

According to processing technology, in order not hurt body, working depth H is darker, and width R is larger.Working depth H is darker, and disturbance is stronger, and heat transfer effect is better.But in the condenser the inside, we need to consider that the increase of water resistance can increase the power of water circulating pump, and run to the problem that the certain hour heat exchanger tube need to clean, and we have selected only technical scheme to use in the utility model by research.The working depth of the helix that the utility model provides and width, the increase that both can bring heat transfer effect also can make things convenient for scale removal, simultaneously unconspicuous increase water resistance.

Claims

1. multi-stage cross heat exchanger tube, respectively there is one section light pipe section at the two ends of described heat exchanger tube; It is characterized in that: be that the parallel and spacing of three of turning clockwise along the body direction equates that helix and spacing parallel with three that are rotated counterclockwise equates that helix intersects the multi-stage cross stereochemical structure that consists of mutually at described heat exchanger tube interlude, the process data of three helixes that turn clockwise and three helixes that are rotated counterclockwise is different; Described process data comprises working depth and width.

2. multi-stage cross heat exchanger tube according to claim 1, it is characterized in that: intersecting at perpendicular to the body direction of helix can form three complete square structures, and three square sizes are the same; Because the compacting of helix extruding, it is recessed outside pipe to form helix, at the pipe inner process; Square is at the pipe outer process, and is recessed in pipe.

3. multi-stage cross heat exchanger tube according to claim 1 is characterized in that: described clockwise helix and counterclockwise intersecting angle a=90 ° of helix.

4. multi-stage cross heat exchanger tube according to claim 1 is characterized in that: described clockwise helix or counterclockwise helix and body vertical direction angle b=45 °.

5. multi-stage cross heat exchanger tube according to claim 1 is characterized in that: described clockwise helix working depth H ₁=0.5mm, width R ₁=0.5mm; Counterclockwise helix working depth H ₂=0.8mm, width R ₂=0.8mm; Perhaps the helix working depth is 0.5mm counterclockwise, and width is 0.5mm; The helix working depth is 0.8mm clockwise, and width is 0.8mm.