CN2662187Y

CN2662187Y - An externally intensified heat transferring composite tube

Info

Publication number: CN2662187Y
Application number: CN 03207498
Authority: CN
Inventors: 白争鸣; 张智; 杨开远
Original assignee: DAQING PETROCHEMICAL MACHINERY FACTORY; CNPC Daqing Petrochemical Complex
Current assignee: DAQING PETROCHEMICAL MACHINERY FACTORY; CNPC Daqing Petrochemical Complex
Priority date: 2003-09-01
Filing date: 2003-09-01
Publication date: 2004-12-08
Anticipated expiration: 2013-09-01

Abstract

The utility model relates to an extrinsic-strengthening heat-transfer composite tube of a heat exchanger, providing an effective strengthening heat-transfer tube which accords with national standard and can be used at low temperature (below minus 20 DEG C). The utility model comprises a base tube and an outer composite coated tube which are combined tightly. Strengthening heat-transfer thread fins are arranged on the outer composite coated tube. When the outer composite coated tube works in the low-temperature heat-transfer equipment, the base tube has a support and heat-transfer function; the thread fins of the outer composite coated tube have a strengthening heat-transfer function, which increases heat-transfer rate greatly and solves the restricting problem of scratching on the surface of the pressure-bearing unit at low temperature. As a result, the utility model has wide application in petrochemical industry, medicine, food and other fields.

Description

A kind of outer augmentation of heat transfer multiple tube

Technical field: the utility model belongs to the heat transmission equipment of petrochemical industry, a kind of outer augmentation of heat transfer multiple tube that particularly uses on the heat transmission equipment.

Background technology: at present, in petrochemical equipment, high-performance heat exchanger has obtained applying widely.Efficient heat-exchanging pipe in the high-performance heat exchanger generally all is an intensify heat transfer pipe outside screwed pipe by being processed into of the outer surface of pipe, T type finned tube, prismatic finned tube etc.But for the low temperature applying working condition that is lower than-20 ℃, national standard (GB150 and GB151) is clearly stipulated: " must not delineate or beat material marking, welder's steel seal etc. on pressure parts ".This regulation has seriously restricted the application of outer augmentation of heat transfer efficient heat-exchanging pipe under low temperature environment.The effective means that present conventional shell-and-tube heat exchanger pipe evaporates augmentation of heat transfer outward is fin or surface preparation porous coatings such as the rolling T type of tube outer surface, prismatic.Though porous coating augmentation of heat transfer effect is better, the manufacturing cost height though finned tube processing costs such as T type, prismatic are low, can not be used for cryogenic heat transfer equipment, can not satisfy the requirement of GB151 Cryo Equipment pressure parts.

Summary of the invention: main purpose of the present utility model is exactly in order to address the above problem, the multiple tube of augmentation of heat transfer outside a kind of pipe that uses under cryogenic conditions is provided, when making efficient heat-exchanging pipe under cryogenic conditions, give full play to efficient heat transfer, can satisfy the national standard requirement again, guarantee the security of operation of Cryo Equipment.

To achieve these goals, outer augmentation of heat transfer multiple tube of the present utility model comprises parent tube and outer compound cage walls, for closely cooperating, the screw thread fin of augmentation of heat transfer is arranged on the outer compound cage walls between parent tube and the outer compound cage walls.

This outer augmentation of heat transfer multiple tube is in the cryogenic heat transfer equipment running process, the parent tube that plays pressure-bearing and heat transfer effect meets national standard (GB150 and GB151) requirement fully, parent tube and outer compound cage walls closely cooperate, and the screw thread fin that has on the outer compound cage walls of augmentation of heat transfer plays the augmentation of heat transfer effect.Screw thread fin on the outer compound cage walls generally is rolled into T shape fin or prismatic fin through rolling formation; Outer cage walls can be identical with basepipe materials, also can be different, and specifically will be according to the operating mode decision of heat transfer medium; The complex method of outer cage walls can be parent tube utmost point winding weldering in addition, also can be that the metal tape spiral twines, also can be that sheet material coats, also can be that pipe is outer rolls the outer tube that the screw thread fin is arranged, and the screw thread fin on the outer compound cage walls is rolled into T shape or prismatic by three-high mill.

Outer augmentation of heat transfer multiple tube of the present utility model, because parent tube and outer cage walls adopt split interference or cladding in conjunction with design, this outer augmentation of heat transfer multiple tube can be applied in the cryogenic heat transfer equipment, greatly improved the heat transfer efficiency of equipment, solve the responsive increase problem of the material fragility that the delineation of pressure restraining element surface causes under the low temperature effectively, had wide purposes aspect the cryogenic heat transfer of industry such as petrochemical industry, medicine, food.Simultaneously,, can save non-ferrous metal to greatest extent, save the device fabrication cost according to different operating modes because basepipe materials and outer coating tube material can adopt the material of unlike material.

Description of drawings: Fig. 1 is a structural representation of the present utility model;

Embodiment:

Embodiment 1: as shown in Figure 1, the outer surface of parent tube (1) is carried out being enclosed within the outer cage walls (2) after the bright and clean processing, outer cage walls (2) is carried out stretching after the heat treated, make between parent tube (1) and the outer cage walls (2) contact closely.Surface Machining with outer cage walls (2) goes out the dark helical groove of the wide 2mm of about 1.5mm then, make the surface of outer cage walls (2) form the spiral wing, processing the T type (3) that the spiral wing is rolled into about 1.5mm through rolling, the helical groove after the extruding has also formed the T type simultaneously.According to the environment for use difference, parent tube (1) can be carbon steel pipe or stainless steel tube etc., and outer cage walls (2) can be aluminum pipe, copper pipe or carbon steel pipe.Parent tube in the present embodiment (1) is a carbon steel pipe, and outer cage walls (2) is an aluminum pipe.Utilize the experimental prototype heat exchanger applications of this pipe manufacturer to make condenser at dethanizer, working environment is:

Temperature :-33--35 ℃ on pipe layer, medium: deethanization cat head liquid

Shell temperature :-37--40 ℃; Medium: propylene

Pressure is greater than 2.0Mpa

Its result of use is very desirable.

Embodiment 2: as shown in Figure 1, after the outer surface of parent tube (1) carried out bright and clean processing, twine cage walls (2) outside the formation with metal tape at the outer surface spiral of parent tube (1), Surface Machining with outer cage walls (2) goes out the helical groove that about 1.5mm is wide, 2mm is dark then, make the surface of outer cage walls (2) form helical fin, at the T type fin (3) that the spiral wing is rolled into about 1.5mm through rolling processing, helical groove after the rolling has simultaneously also formed T type groove (if spiral twines the helical fin that the metal tape of usefulness has projection outward, directly the T matrix is processed in rolling).Metal tape is generally copper or aluminium, and parent tube (1) can be carbon steel pipe or stainless steel tube etc. according to the environment for use difference.

T type finned tube is a kind of efficient heat-exchanging pipe.Its design feature is to form a series of spiral ring T types tunnel at tube outer surface.Manage and in the tunnel, form a series of nuclei of bubbles when outer medium is heated, because heating status around the medium in the chamber, tunnel is in, nuclei of bubbles is expanded rapidly and is full of inner chamber, continues to be heated bubble inner pressure power is increased fast, impels bubble ejection rapidly from the tube-surface finedraw.The bubble ejection time has the bigger strength of washing away, and produces certain local decompression, makes on every side that lower temperature liquid pours in T type tunnel, forms continual boiling.This boiling mode is in the unit interval, and the heat of taking away on the per surface area is far longer than light pipe, thereby this cast has higher boiling heat transfer ability.

The single tube experiment that with the freon-11 is medium shows that T type pipe boiling heat transfer coefficient can reach 10 times of light pipe; With liquefied ammonia is the tubule bundle experimental result of medium, and overall heat-transfer coefficient is 2.2 times of light pipe; With C ₃, C ₄The reboiler industry of hydro carbons knockout tower is demarcated and is shown that during underload, T type pipe overall heat-transfer coefficient is higher by 50% than plain tube, and is high by 99% when loading greatly.

As long as the shell-side medium is relatively clean, no solid particle, no colloid, all can adopt T type finned tube to make heat exchange element, manufacture T type fin tube type high-performance heat exchanger, with raising boiling heat transfer effect.

Claims

1, a kind of outer augmentation of heat transfer multiple tube is made of parent tube and outer compound cage walls, and it is characterized in that between parent tube (1) and the outer compound cage walls (2) having the screw thread fin (3) of augmentation of heat transfer for closely cooperating on the outer compound cage walls (2).

2, outer augmentation of heat transfer multiple tube as claimed in claim 1 is characterized in that the screw thread fin (3) that outer compound cage walls (2) is gone up augmentation of heat transfer is a T shape fin.

3, outer augmentation of heat transfer multiple tube as claimed in claim 1 is characterized in that the screw thread fin (3) that outer compound cage walls (2) is gone up augmentation of heat transfer is a rib type fin.