CN201155932Y - A continuous helical baffle double-shell combined special-shaped tube bundle heat exchanger - Google Patents

Abstract

The utility model discloses a special-shaped tube bundle heat exchanger with continuous spiral baffle double-shell side combination. The head at one end is provided with a tube pass inlet and a tube pass outlet, and one of the tube bundles and the tube bundle are also arranged between the tube plates. One of the tube bundles is composed of one of the plurality of heat transfer tubes, arranged between the central tube and the shell; the second of the tube bundle is composed of two of the plurality of heat transfer tubes, arranged in the central tube; one of the heat transfer tubes is The special-shaped tube with rough wall surface, the second of the heat transfer tube is a spiral flat tube; the fixed distance tube and one of the tube bundles pass through the spiral baffle, and the two ends are respectively connected with the tube sheet, and the spiral baffle is fixed by the fixed distance tube; the tube bundle The two ends of the two are also respectively connected with the tube sheet; there are two notches corresponding to the shell-side inlet and the shell-side outlet of the heat exchanger respectively on the central tube. The utility model adopts two tube bundles with different heat transfer tube structures, less fluid reverse mixing, no flow dead zone, little influence of bypass flow and leakage flow, can make full use of shell diameter to arrange heat transfer tubes, and has high heat transfer coefficient .

Description

A continuous helical baffle double-shell combined special-shaped tube bundle heat exchanger

technical field

The utility model relates to the technical field of heat exchangers, in particular to a continuous spiral baffle heat exchanger.

Background technique

There are many structures of heat exchangers used in industry. In terms of the structure of the support between the tubes, there are mainly single-bow baffles, double-bow baffles, and disc-ring baffles. The commonly used heat exchangers are single-bow baffles. There are many structures of baffles supporting tube bundles, and the heat transfer tubes are mainly smooth heat transfer tubes. In the bow-shaped baffle heat exchanger, the fluid flows back and forth between the baffles to scour the tube bundle. The fluid body resistance and pressure drop caused by the baffle are large, and it is easy to cause the vibration damage of the tube bundle. At the same time, the heat transfer coefficient of the smooth tube is low, which also leads to poor heat transfer performance of the heat exchanger. The spiral flow of the fluid on the shell side has the advantages of uniform flow, low pressure drop and not easy to cause vibration of the tube bundle. The heat exchanger using the spiral baffle as the support structure between the tubes can overcome the inherent shortcomings of the bow-shaped baffle heat exchanger. The combination of baffles and special-shaped tubes can further improve the heat transfer performance of the heat exchanger. At present, the spiral baffle heat exchanger mainly includes two categories, one is the discontinuous spiral baffle heat exchanger without a central tube, and the other is a continuous spiral baffle heat exchanger with a central tube. . Discontinuous spiral baffles are generally composed of multiple fan-shaped flat plates (see Chinese patent 03213481.9 published on July 14, 2004 and Chinese patent 200320106763.1 published on November 10, 2004), between two adjacent fan-shaped plates There is a triangular gap between them, and there is a leakage problem and an increase in resistance. The continuous spiral baffle provided with a central tube does not have the above problems, and the assembly of the heat exchanger is simpler. The reason is that the spiral baffles are fixed on the central tube, and the heat transfer tubes are easier to pass through the tube holes of the spiral baffles when the shell-side tube bundle is assembled. But the central tube of the existing continuous spiral baffle heat exchanger is mainly used to support the spiral baffle, and there is no tube bundle arranged in the central tube (see Chinese patent 03214056.8 published on August 4, 2004 and published on January 2006 Chinese Patent No. 200510043033.5 dated November 11), since the diameter of the central tube is usually 20% to 40% of the diameter of the heat exchanger shell, this reduces the number of pipes per unit shell diameter and reduces the heat transfer area of the heat exchanger. Especially for heat exchangers with larger shell diameters, the loss area is more, and the heat transfer performance of the heat exchanger decreases more.

Utility model content

The purpose of the utility model is to overcome the above-mentioned shortcomings of the existing continuous spiral baffle heat exchanger, and provide a continuous spiral baffle double-shell-side combined special-shaped tube bundle heat exchanger, and the heat exchange area is obviously improved.

The utility model is realized through the following technical solutions:

The utility model continuous spiral baffle double-shell combined special-shaped tube bundle heat exchanger includes a head, a shell, a continuous spiral baffle, one of the heat transfer tubes, a central tube, a fixed distance tube, and a tube plate. A continuous spiral baffle, a central tube, one of the heat transfer tubes and a distance tube are arranged between the tube sheets. The two ends of the central tube and the second heat transfer tube are also connected to the tube sheet respectively. The continuous spiral baffle is fixed by the distance tube. There is a shell side inlet and a shell side outlet, and there is a gap in the position of the center tube corresponding to the shell side inlet and outlet of the heat exchanger, which guides the fluid into the center tube and flows in the shell side of the second tube bundle; one of the heat transfer tubes The outer surface of the pipe wall is a non-smooth structure, which is supported by continuous spiral baffles. One of the heat transfer tubes is a low rib tube, a petal tube, a spiral groove tube, a ribbed tube or a scaling tube. One arrangement of the heat transfer tubes may be triangular tube arrangement, corner triangular tube arrangement, square tube arrangement, corner square tube arrangement or concentric circle tube arrangement. The heat exchanger can be of fixed tube sheet type, floating head type or U-shaped tube type and other structural forms.

The heat transfer tubes in one of the above-mentioned tube bundles are special-shaped tubes with non-smooth walls, which can be low-rib tubes with two-dimensional fins, petal tubes with discontinuous three-dimensional fins, horizontal ribbed tubes or spiral grooved tubes, and scaling tubes. The heat transfer tube of the second tube bundle is a spiral flat tube, which is a special-shaped tube with a non-circular cross section. The heat transfer tube is based on a round tube, which is twisted after being flattened, and its cross section is elliptical. , a plurality of spiral flat tubes point-contact along the tube axis and support each other to form a tube bundle without baffle support.

Compared with the prior art, the utility model has the following beneficial effects:

1. Heat transfer tubes are arranged in the central tube of the continuous spiral baffle heat exchanger, making full use of the shell diameter, increasing the heat transfer area, and improving the total heat transfer coefficient;

2. The heat transfer tube placed in the central tube is a spiral flat tube, and a plurality of spiral flat tubes point-contact and support each other along the tube axis to form a tube bundle, without supporting baffles, and the structure is simple. In the spiral flat tube bundle, the fluids inside and outside the tubes rotate longitudinally, the pressure drops, the boundary layer of the tube wall fluid is continuously destroyed, the turbulence is strong, and the heat transfer coefficient is high.

3. The two tube bundles are combined with heat transfer tubes of different structures to achieve enhanced heat transfer. Compared with the existing continuous spiral baffle heat exchanger, under the same conditions, the total heat transfer coefficient of the continuous spiral baffle double shell-side combined special-shaped tube bundle heat exchanger of the utility model can be increased by more than 30%.

Description of drawings

Fig. 1 is a structural schematic diagram of the fixed tube-sheet type continuous spiral baffle double-shell combined special-shaped tube bundle heat exchanger of the present invention.

Fig. 2 is a structural schematic diagram of one of the continuous spiral baffle tube bundles with a central tube.

Fig. 3 is a schematic structural diagram of a central tube with a notch.

Fig. 4 is a schematic view of the spiral flat tube placed in the central tube and its cross section.

Fig. 5 is an axial sectional view of a two-dimensional finned low-rib tube.

Fig. 6a is a schematic structural diagram of a three-dimensional finned petal tube. The three-dimensional fin parameters are fin height h, fin pitch p1, and fin gap P2; Fig. 6b is a radial cross-sectional view of a three-dimensional finned petal tube.

Fig. 7 is an axial sectional view of a spirally grooved tube.

Fig. 8 is an axial cross-sectional view of the transverse tube.

Fig. 9 is an axial sectional view of the zoom tube.

Figure 10 is a diagram of the concentric circles of one of the tube bundles.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings, but the embodiments of the utility model are not limited thereto.

As shown in Figure 1, in this embodiment, the combined special-shaped tube bundle heat exchanger with continuous spiral baffles and double shells is mainly composed of a head 1, a shell side inlet 2, a shell 3, a continuous spiral baffle 4, and the tube bundle. One of heat transfer tubes 5, spacer tube 6, tube plate 7, tube side outlet 8, tube side inlet 9, shell side outlet 10, center tube 11, heat transfer tube 2 of tube bundle 2 12. A continuous spiral baffle 4 , one of the heat transfer tubes 5 , a distance tube 6 , a central tube 11 and a second of the heat transfer tubes 12 are arranged between the tube sheets 7 . One of the heat transfer tubes 5 and the distance tube 6 pass through the continuous spiral baffle 4 , and its two ends are connected with the tube sheet 7 respectively, and the continuous spiral baffle 4 is fixed by the distance tube 6 . The two ends of the central tube 11 and the second heat transfer tube 12 are also connected with the tube sheet 7 respectively. Figure 1 shows a fixed tubesheet heat exchanger.

As shown in Figures 2 and 3, the spiral baffle 4 is a continuous spiral structure, and the center of the tube bundle is provided with a central tube 11 . At positions corresponding to the inlet and outlet of the shell side, there is a gap on the center pipe to guide the fluid to enter and exit from the center pipe.

As shown in Figure 4, the spiral flat tube is based on a round tube, which is twisted and shaped after being flattened. , without supporting baffles. The cross-sections of the spiral flat tubes at different positions are all elliptical.

Figures 5 to 7, 8, and 9 are axial cross-sectional views of two-dimensional finned low-rib tubes, spiral grooved tubes, ribbed tubes, and zoom tubes, all of which can be used as heat transfer tubes as one of the tube bundles.

Fig. 6 is a cross-sectional view of a three-dimensional finned petal tube and a schematic view of the fin structure, and the tube can also be used as a heat transfer tube of one of the tube bundles. The metals of all the above heat transfer tubes can be carbon steel, stainless steel, non-ferrous metals and alloys.

As shown in Fig. 10, the heat transfer tubes of one of the tube bundles may be arranged in concentric circles.

Claims (10)

1, a kind of continuous spiral traverse baffle double shell side combined special-shaped tube bundle heat exchanger comprises housing (3), tube sheet (7) and end socket (1), is provided with continuous helical deflecting plate (4), central tube (11) and distance sink tube (6) between the tube sheet (7); The end socket (1) of described heat exchanger one end is provided with tube side import (9) and tube side outlet (8), it is characterized in that: also be provided with two of one of tube bank and tube bank between the tube sheet (7), one of tube bank is arranged between central tube (11) and the housing (3), and two of tube bank is arranged in the central tube (11); One of described tube bank is made of one of a plurality of heat-transfer pipes (5), two two (12) formations by a plurality of heat-transfer pipes of tube bank; Helical baffles (4) is passed in one of distance sink tube (6) and tube bank, and its two is connected with tube sheet (7) respectively, and helical baffles (4) is fixing by distance sink tube (6); Two of two of tube bank also is connected with tube sheet (7) respectively; On housing (3), be provided with shell side import (10) and shell side outlet (2); Have respectively shell side import (10) and shell side outlet (2) corresponding two breach on the central tube (11) with heat exchanger.

2,, it is characterized in that one of described heat-transfer pipe (5) is the special pipe of hydraulically rough surface according to right 1 described heat exchanger.

3,, it is characterized in that one of described heat-transfer pipe (5) is the low ribbed pipe of two-dimentional fin according to right 1 described heat exchanger.

4,, it is characterized in that one of described heat-transfer pipe (5) is the petal-shaped fin tube of three-dimension fin according to right 1 described heat exchanger.

5,, it is characterized in that one of described heat-transfer pipe (5) is band pipe or spiral grooved tube according to right 1 described heat exchanger.

6,, it is characterized in that one of described heat-transfer pipe (5) is the convergent-divergent pipe according to right 1 described heat exchanger.

7,, it is characterized in that two (12) of described heat-transfer pipe are the special pipe of oval cross section according to right 1 described heat exchanger.

8,, it is characterized in that two (12) of described heat-transfer pipe are spiral flat tube according to right 1 described heat exchanger.

9,, it is characterized in that a plurality of heat-transfer pipes in one of described tube bank are triangle stringing, corner triangle stringing, square stringing, corner square stringing or concentric circles stringing according to right 1 described heat exchanger.

10, according to right 8 described heat exchangers, it is characterized in that described spiral flat tube is is parent tube with the pipe, distortion moulding after flattening, its cross section be oval, many spiral flat tubes along tube axial direction point contact mutually support formation tube bank two.

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