CN214892760U

CN214892760U - Copper-aluminum composite material inner and outer finned tube heat exchanger

Info

Publication number: CN214892760U
Application number: CN202121346463.5U
Authority: CN
Inventors: 马杰; 彭浩; 翟鑫钰
Original assignee: Nanjing Xinchen Energy Saving And Environmental Protection Co ltd
Current assignee: Nanjing Xinchen Energy Saving And Environmental Protection Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2021-11-26
Anticipated expiration: 2031-06-17

Abstract

The utility model discloses an inside and outside finned tube heat exchanger of copper aluminium combined material, including the casing, fix at the tube sheet at casing both ends, fix the heat exchange tube that head, a plurality of at the tube sheet lateral surface are on a parallel with the baffle of tube sheet and a plurality of perpendicular to tube sheet, the heat exchange tube includes copper pipe, concentric nested copper matter inner fin and the outer fin of aluminium matter of concentric nested copper outside the copper pipe of copper pipe inside. The copper-aluminum composite material inner and outer finned tube heat exchanger is compact and reasonable in structure, convenient to use, disassemble, assemble and repair, and capable of increasing the shell side heat exchange area, enabling the whole unit volume heat exchange area of the heat exchanger to be higher than that of a common heat exchanger, meanwhile, strengthening the convection heat exchange of the inner side and the outer side of the tube, enabling the heat exchange density of the whole heat exchanger to be higher than that of the common heat exchanger, and enabling the whole weight of the heat exchanger to be kept at a lower level while the heat exchange area is increased through the mode of combining copper materials and aluminum materials.

Description

Copper-aluminum composite material inner and outer finned tube heat exchanger

Technical Field

The utility model belongs to the technical field of the heat exchanger, concretely relates to inside and outside finned tube heat exchanger of copper aluminium combined material.

Background

Currently, the main problems of low utilization efficiency, poor economic benefit and high ecological environment pressure still exist in energy utilization in China, the important contents of energy conservation and emission reduction, energy consumption reduction and energy comprehensive utilization rate improvement are taken as energy development strategy planning, the fundamental approach for solving the energy problems in China is provided, and the priority development position is achieved. The aims of realizing energy conservation and emission reduction and improving the energy utilization rate mainly depend on the industrial field. In china, which is in the middle and later stages of industrialization, industry is the main energy consumption field and is also the main emission source of pollutants. The energy consumption of the industrial field in China accounts for about 70 percent of the total energy consumption of China, and the unit energy consumption of main industrial products is higher than the international advanced level by about 30 percent on average. Except for the factors that the production process is relatively lagged behind and the industrial structure is unreasonable, the industrial waste heat utilization rate is low, the energy (energy) is not fully and comprehensively utilized, which is an important reason causing high energy consumption, the energy utilization rate of China is only about 33 percent, which is about 10 percent lower than that of developed countries, and at least 50 percent of industrial energy consumption is directly abandoned by waste heat in various forms.

Therefore, from another perspective, industrial waste heat resources in China are abundant and widely exist in production processes of various industries in industry, the waste heat resources account for 17% -67% of the total fuel consumption, the recovery rate can reach 60%, the waste heat utilization rate is large in improvement space, the energy-saving potential is huge, the industrial waste heat recovery is considered as a new energy source, and the waste heat recovery is an important content for promoting energy-saving and emission-reducing work in China in recent years.

At present, the heat exchanger is adopted for waste heat recovery, and the most applied heat exchanger is a shell-and-tube heat exchanger, so that the applicable operating temperature and pressure range is large, the manufacturing cost is low, the cleaning is convenient, the treatment capacity is large, and the work is reliable. The fin is one of the earliest and most successful methods for improving the tube heat exchanger, generally, the fin is only additionally arranged on the outer side of the heat exchange tube to achieve the purpose of increasing the heat transfer area, and meanwhile, the problem that the overall quality of the heat exchanger is heavier due to the fact that a large number of fins are additionally arranged is solved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an inside and outside finned tube heat exchanger of copper aluminium combined material to solve the less and whole quality problem of weight on the verge of traditional heat exchanger heat transfer area.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an inside and outside finned tube heat exchanger of copper aluminium combined material, includes the casing, fixes the tube sheet at casing both ends, fixes head, a plurality of baffle and the heat exchange tube of a plurality of perpendicular to tube sheet that are on a parallel with the tube sheet at tube sheet lateral surface, the heat exchange tube includes copper pipe, the copper inner fin of concentric nestification in the copper pipe inside and the aluminium matter outer fin of concentric nestification in the copper pipe outside.

Preferably, the number of the end sockets is two, a pass partition plate is arranged at the center of one end socket, a tube pass inlet and a tube pass outlet are respectively arranged at the upper end and the lower end of the end socket, a shell pass outlet is arranged at the upper end of one side of the shell, and a shell pass inlet is arranged at the lower end of the other side of the shell.

Preferably, the copper inner fins are longitudinally continuous straight fins, wherein the cross section of each copper inner fin is provided with a plurality of fins, an included angle between every two adjacent fins is 25-35 degrees, and the fin height is smaller than the inner radius of the copper pipe.

Preferably, the aluminum outer fin is one of a longitudinally continuous straight fin or a helical fin, the cross section of the aluminum outer fin is provided with a plurality of fins, the fin height of the aluminum outer fin is greater than that of the copper inner fin, and the fin thickness of the aluminum outer fin is greater than that of the copper inner fin.

Preferably, when the aluminum outer fin adopts a spiral structure, the thread pitch is smaller than the diameter of the copper pipe, notches or holes are formed in the aluminum outer fin along the spiral line, the notches can be in one of a rectangle shape, a trapezoid shape or a semicircular shape, the width of each notch is not larger than 20 millimeters, the distance between every two adjacent notches is 40-80 millimeters, and the inner diameter of each hole is not larger than 15 millimeters.

Preferably, the baffles are welded on the inner surface of the shell, the number of the baffles is even and is in a single arc shape, and two adjacent baffles are symmetrically distributed and have equal intervals.

Preferably, the arrangement form of the heat exchange tubes is one of regular triangle, square, corner regular triangle and corner square, and the distance between two adjacent heat exchange tubes is equal.

Preferably, the copper inner fin and the aluminum outer fin are both formed by rolling, and are connected with the copper pipe in an expansion joint or brazing connection mode.

The utility model discloses a technological effect and advantage: 1. compact and reasonable structure, convenient use, disassembly and assembly and repair. 2. The heat exchange tube is internally provided with the longitudinal straight copper fins, so that the heat exchange area in the tube is increased, the flow disturbance in the tube is increased, and the flow and heat transfer processes in the tube are comprehensively optimized. 3. The heat exchange tubes are externally provided with aluminum longitudinal straight fins, so that the shell-side heat exchange area is increased, the heat exchange area per unit volume of the whole heat exchanger is higher than that of a common heat exchanger, meanwhile, the convection heat exchange at the two sides inside and outside the tubes is strengthened, and the heat exchange density of the whole heat exchanger is higher than that of the common heat exchanger. 4. The mode that copper product and aluminum product combine makes the heat exchanger make the whole weight of heat exchanger keep at lower level when increasing heat transfer area. In conclusion, the heat exchange capacity of the tube-fin heat exchanger is remarkably superior to that of the common tube-fin heat exchanger under the same weight.

Drawings

Fig. 1 is a vertical cross-sectional view of the present invention.

Fig. 2 is a schematic diagram of the internal structure of the present invention.

Fig. 3 is a schematic structural diagram of the spiral fin heat exchange tube of the present invention.

Fig. 4 is a detailed view of a portion a of the spiral fin heat exchange tube of the present invention.

Fig. 5 is a longitudinal sectional view of the helical fin heat exchange tube of the present invention.

Fig. 6 is a schematic structural view of the grooves on the helical fins of the present invention.

Fig. 7 is a schematic view of the structure of the spiral fin of the present invention.

In the figure: 1. a tube side inlet; 2. a tube sheet; 3. a heat exchange pipe; 4. a shell-side outlet; 5. a housing; 6. a baffle plate; 7. a shell side inlet; 8. sealing the end; 9. a split-range partition plate; 10. a tube side outlet; 11. a copper pipe; 12. a copper inner fin; 13. an aluminum outer fin; 14. a notch; 15. and (4) a hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides an inside and outside finned tube heat exchanger of copper aluminium combined material as shown in the picture, including casing 5, fix at the tube sheet 2 at casing 5 both ends, fix head 8, a plurality of that 2 lateral surfaces of tube sheet are on a parallel with baffle 6 and the heat exchange tube 3 of a plurality of perpendicular to tube sheet 2 of tube sheet 2, heat exchange tube 3 includes copper pipe 11, concentric nested in the copper of copper pipe 11 inside 12 fins and concentric nested in the outside aluminium matter outer fin 13 of copper pipe 11.

The heat exchange tube 3 is one of the elements of the heat exchanger, is arranged in the cylinder body and is used for exchanging heat between two media. Has high thermal conductivity and good isothermal property. It is a device that can rapidly transfer heat energy from one point to another with little heat loss, and is therefore called a heat-transfer superconductor, which has a thermal conductivity several thousand times that of copper. In order to improve the heat exchange efficiency, fins are usually added on the surface of the heat exchange tube 3 to increase the external surface area or the internal surface area of the heat exchange tube, thereby achieving the purpose of improving the heat exchange efficiency. When the difference of the thermal coefficients is large between the two sides of the inner diameter of the tube, the fins of the finned tube are arranged on the side with the low thermal coefficient.

The size of the heat exchange tube 3 is generally expressed by the outer diameter x wall thickness, and commonly used seamless steel tubes mainly having the sizes of phi 19mmx2mm, phi 25mmx2.5mm and phi 38mmx2.5mm and stainless steel tubes having the sizes of phi 25mmx2mm and phi 38mmx2.5 mm. The standard tube length is 1.5, 2.0, 3.0, 4.5, 6.0, 9.0m, etc. The small pipe diameter is adopted, so that the heat transfer area of unit volume is increased, the structure is compact, the metal consumption is reduced, and the heat transfer coefficient is improved. According to estimation, the heat exchange tube of the heat exchanger with the same diameter is changed from phi 25mm to phi 19mm, the heat transfer area can be increased by about 40%, and the metal is saved by more than 20%. But the small tube flow has large resistance, is inconvenient to clean and is easy to scale and block. Typically, large diameter tubing is used for viscous or dirty fluids and small diameter tubing is used for cleaner fluids. Common materials include carbon steel, low alloy steel, stainless steel, copper-nickel alloy, aluminum alloy, titanium, and the like. There are also some non-metallic materials such as graphite, ceramics, teflon, etc. The design should be based on working pressure, temperature and medium corrosivity. The arrangement form of the heat exchange tubes 3 on the tube plate 2 mainly comprises regular triangles and squares, corner regular triangles and corner squares. Regular triangular arrangements can be used most commonly with the maximum number of tubes arranged in the same tube sheet area, but the tubes are not easily cleaned. For the purpose of external cleaning, a square or corner square arrangement of the tube bundles may be used.

In addition, head 8 is equipped with two altogether, one of them head 8's center department is equipped with the pass partition board 9, just head 8's upper and lower both ends are equipped with tube side import 1 and tube side export 10 respectively, the upper end of 5 one sides of casing is equipped with shell side export 4 and the lower extreme of opposite side is equipped with shell side import 7, makes things convenient for the fluid of tube side to get into from head 8's tube side import 1, receives the separation of pass partition board 9, passes many heat exchange tubes 3 of fixing on tube sheet 2 and reaches opposite side head 8, returns to head 8 of inlet outlet side by heat exchange tube 3, flows out by tube side export 10. The shell side fluid enters from a shell side inlet 7 on the shell 5 and flows out from a shell side outlet 4 under the guidance of a baffle 6.

The key point is that the copper inner fins 12 are longitudinally continuous straight fins, wherein the cross section of each copper inner fin 12 is provided with a plurality of fins, the included angle between every two adjacent fins is 25-35 degrees, the fin height is smaller than the inner radius of the copper tube 11, the aluminum outer fins 13 are longitudinally continuous straight fins or spiral fins, the cross section of each aluminum outer fin 13 is provided with a plurality of fins, the fin height is larger than that of each copper inner fin 12, the fin thickness is larger than that of each copper inner fin 12, when the aluminum outer fins 13 adopt a spiral structure, the thread pitch is smaller than the tube diameter of the copper tubes 11, notches 14 or holes 15 are formed in the aluminum outer fins 13 along a spiral line, each notch 14 can be one of a rectangle, a trapezoid or a semicircle, the width of each notch 14 is not more than 20 mm, the distance between every two adjacent notches 14 is 40-80 mm, and the inner diameter of each hole 15 is not more than 15 mm, the baffle 6 welds the internal surface at casing 5, the number of baffle 6 is the even number and is the single bow-shaped, adjacent two baffle 6 symmetric distribution and interval equal, heat exchange tube 3's arrangement form is one of regular triangle, square, corner regular triangle and corner square, and adjacent two the interval of heat exchange tube 3 equals, can effectively increase heat transfer area, strengthens the holistic waste heat recovery ability of heat exchanger.

It is worth mentioning that the copper inner fins 12 and the aluminum outer fins 13 are formed by rolling, and are connected with the copper pipes 11 in an expansion joint or brazing connection mode, wherein the expansion joint method mainly adopts expansion joint and end face welding, firstly welding and then expanding, and the brazing method mainly adopts medium-low temperature brazing.

The working principle is as follows: when the copper-aluminum composite material inner and outer finned tube heat exchanger is used, fluid on the tube side enters from a tube side inlet 1 of an end enclosure 8, is blocked by a pass partition plate 9, passes through a plurality of heat exchange tubes 3 fixed on a tube plate 2 to reach the end enclosure 8 on the other side, returns to the end enclosure 8 on the inlet and outlet side through the heat exchange tubes 3, flows out from a tube side outlet 10, enters from a shell side inlet 7 on a shell 5, and flows out from a shell side outlet 4 under the guidance of a baffle 6. Considering that the tube-side fluid is at a higher temperature during the in-stroke, the shell-side fluid flows counter-currently to the tube-side fluid during the in-stroke and co-currently to the tube-side fluid during the out-stroke.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides an inside and outside finned tube heat exchanger of copper aluminium combined material, includes casing (5), fixes tube sheet (2) at casing (5) both ends, fixes head (8) at tube sheet (2) lateral surface, baffle (6) that a plurality of is on a parallel with tube sheet (2) and heat exchange tube (3) of a plurality of perpendicular to tube sheet (2), its characterized in that: the heat exchange tube (3) comprises a copper tube (11), a copper inner fin (12) concentrically nested inside the copper tube (11) and an aluminum outer fin (13) concentrically nested outside the copper tube (11).

2. The copper-aluminum composite material inner and outer finned tube heat exchanger as claimed in claim 1, characterized in that: the shell is characterized in that the number of the end sockets (8) is two, a pass partition plate (9) is arranged at the center of one end socket (8), a tube pass inlet (1) and a tube pass outlet (10) are respectively arranged at the upper end and the lower end of the end socket (8), a shell pass outlet (4) is arranged at the upper end of one side of the shell (5), and a shell pass inlet (7) is arranged at the lower end of the other side of the shell.

3. The copper-aluminum composite material inner and outer finned tube heat exchanger as claimed in claim 1, characterized in that: the copper inner fins (12) are longitudinally continuous straight fins, wherein the cross section of each copper inner fin (12) is provided with a plurality of fins, the included angle between every two adjacent fins is 25-35 degrees, and the fin height is smaller than the inner radius of the copper pipe (11).

4. The copper-aluminum composite material inner and outer finned tube heat exchanger as claimed in claim 1, characterized in that: the aluminum outer fin (13) is one of a longitudinal continuous straight fin or a spiral fin, the cross section of the aluminum outer fin (13) is provided with a plurality of fins, the fin height of the aluminum outer fin is greater than that of the copper inner fin (12), and the fin thickness of the aluminum outer fin is greater than that of the copper inner fin (12).

5. The copper-aluminum composite material inner and outer finned tube heat exchanger as claimed in claim 4, characterized in that: when aluminium matter outer fin (13) adopt helical structure, the pitch is less than copper pipe (11) pipe diameter, and has seted up notch (14) or hole (15) along the helix on aluminium matter outer fin (13), notch (14) can be one of rectangle, trapezoidal or semi-circular, notch (14) width is not more than 20 millimeters, adjacent two distance between notch (14) is 40 ~ 80 millimeters, the internal diameter of hole (15) is not more than 15 millimeters.

6. The copper-aluminum composite material inner and outer finned tube heat exchanger as claimed in claim 1, characterized in that: the baffle plates (6) are welded on the inner surface of the shell (5), the number of the baffle plates (6) is even and the baffle plates are all in a single arc shape, and the two adjacent baffle plates (6) are symmetrically distributed and have equal intervals.

7. The copper-aluminum composite material inner and outer finned tube heat exchanger as claimed in claim 1, characterized in that: the arrangement form of the heat exchange tubes (3) is one of regular triangle, square, corner regular triangle and corner square, and the distance between two adjacent heat exchange tubes (3) is equal.

8. The copper-aluminum composite material inner and outer finned tube heat exchanger as claimed in claim 1, characterized in that: the copper inner fins (12) and the aluminum outer fins (13) are formed by rolling, and are connected with the copper pipes (11) in an expansion joint or brazing connection mode.