Heat exchanger without radial temperature difference of heat exchange tube bundle

Abstract

The invention relates to the technical field of heat exchangers, and discloses a heat exchange tube bundle radial-temperature-difference-free heat exchanger which comprises a heat exchanger body, a plurality of heat exchange tubes, a tube pass distributor and two guide cylinders. The multiple heat exchange tubes are arranged in a cavity of the heat exchanger body, inlets of the heat exchange tubes communicate with a tube pass inlet of the cavity, outlets of the heat exchange tubes communicate with a tube pass outlet of the cavity, and the tube pass distributor is located on the upstream of the heat exchange tubes. The heat exchanger body is sleeved with the two guide cylinders, one guide cylinder communicates with a shell pass inlet of the cavity, and the other guide cylinder communicates with a shell pass outlet of the cavity. The flow guide cylinder is provided with a first cavity and a plurality of second cavities which are separated, the first cavity communicates with an inlet of the flow guide cylinder, the second cavities are arranged at intervals in the circumferential direction of the heat exchanger body, the flow guide cylinder is provided with a plurality of flow dividing openings and a plurality of flow passing openings, and the second cavities communicate with the shell pass inlets or the shell pass outlets in a one-to-one correspondence mode through the flow dividing openings. And one second cavity is communicated with the second cavity through one overflowing opening.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to a heat exchange tube bundle without radial temperature difference. Background Art

[0002] Shell and tube heat exchangers are widely used in energy, medicine, electricity, and chemical industries. Their main function is to ensure the normal operation of industrial equipment. Most traditional shell and tube heat exchangers use single-bow baffle support. This support structure easily leads to heat transfer dead zones behind the shell-side medium baffles. At the same time, since the fluid flows horizontally through the tube bundle, the fluid easily forms a Karman vortex street behind the heat exchange tube, causing fluid-induced vibration in the tube body. Since the fluid flow is always switching between the longitudinal and transverse directions, the velocity changes dramatically, which also greatly increases the pressure drop in the shell side.

[0003] At present, the phenomenon of heat exchange tube fracture in single-bow heat exchangers has become a pain point in the industry. On the one hand, it is because the hot fluid directly enters the tube side, resulting in a large flow in the middle heat exchange tube and a small flow around it; on the other hand, the heat exchanger adopts an anti-impact baffle and a single-bow baffle structure. The cold fluid forms a large velocity impact around the anti-impact baffle and forms a large deviation flow behind the baffle. The impact of the fluid on the heat exchange tube cannot be guaranteed to be uniform when flowing in the shell side, resulting in a large temperature difference between the inner and outer tubes of the heat exchange tube bundle, and a large thermal stress between the heat exchange tubes, which makes the heat exchange tube easy to break and reduces the equipment service life.

[0004] Therefore, there is an urgent need for a heat exchange tube bundle without radial temperature difference heat exchanger to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a heat exchanger with a heat exchange tube bundle without radial temperature difference, so as to solve the problem of tube cracking caused by large temperature difference between inner and outer tubes of the heat exchange tube bundle and extend the service life of the equipment.

[0006] As conceived above, the technical solution adopted by the present invention is:

[0007] Provided is a heat exchange tube bundle without radial temperature difference heat exchanger, comprising:

[0008] A heat exchanger body, wherein the heat exchanger body has a cavity, and is provided with a shell-side inlet, a shell-side outlet, a tube-side inlet and a tube-side outlet which are connected to the cavity;

[0009] A plurality of heat exchange tubes are arranged in the cavity, wherein the inlet of the heat exchange tube is communicated with the tube side inlet, and the outlet of the heat exchange tube is communicated with the tube side outlet;

[0010] A tube-side distributor is arranged in the cavity, the tube-side distributor is located upstream of the heat exchange tube in the flow direction of the tube-side medium, and the tube-side distributor is used to make the tube-side medium flow evenly into each of the heat exchange tubes;

[0011] Two guide cylinders are sleeved outside the heat exchanger body, one of the guide cylinders is connected to the shell side inlet, and the other guide cylinder is connected to the shell side outlet;

[0012] The guide tube has a separated first chamber and multiple second chambers, the first chamber is connected to the inlet of the guide tube, and the multiple second chambers are arranged at intervals along the circumference of the heat exchanger body. The guide tube is provided with multiple branch ports and multiple flow ports, and the shell side inlet and the shell side outlet are both provided with multiple. The multiple second chambers are connected to the multiple shell side inlets or the multiple shell side outlets through the multiple flow ports in a one-to-one correspondence, and one second chamber is connected to the first chamber through one branch port.

[0013] Optionally, along the circumference of the heat exchanger body, the multiple diverter ports and the multiple flow ports include a first group arranged in a clockwise direction and a second group arranged in a counterclockwise direction, and the sum of the flow areas of the corresponding connected diverter ports and flow ports in each group of the diverter ports and each group of the flow ports first increases and then decreases, and the flow area of ​​one of the diverter ports and one of the flow ports perpendicular to the inlet of the guide tube is the largest.

[0014] Optionally, the sum of the flow areas of the multiple branch ports of a guide tube is S1, the sum of the flow areas of the shell side inlet and the sum of the flow areas of the shell side outlet are both S2, the flow area of ​​the inlet of a guide tube is S3, S1>S3 and S2>2S3.

[0015] Optionally, the tube-side distributor includes a sieve plate, the sieve plate has a first zone and a second zone arranged around the outer periphery of the first zone, sieve holes are arranged on the second zone, and the sieve holes are not arranged on the first zone, and the first zone is the area where the heat exchange tube is projected onto the sieve plate in its own axial direction.

[0016] Optionally, the tube-side distributor further comprises a cylinder, which is sleeved on the outer circumference of the sieve plate, and there is a gap between the inner wall of the cylinder and the outer circumference of the sieve plate, and between the outer wall of the cylinder and the inner wall of the cavity.

[0017] Optionally, the minimum distance between the inner wall of the cylinder and the outer periphery of the sieve plate is L1, 30mm≤L1≤50mm.

[0018] Optionally, the heat exchange tube bundle without radial temperature difference heat exchanger also includes a baffle, which is located in the cavity and is sleeved on the heat exchange tube, and the baffle includes an annular baffle and a disc-shaped baffle, and the annular baffle and the disc-shaped baffle are alternately arranged along the axial direction of the heat exchange tube, and there is at least one annular baffle upstream and downstream of each disc-shaped baffle.

[0019] Optionally, the outer ring of the annular baffle abuts against the inner wall of the cavity, the inner ring of the annular baffle forms a first flow channel, and a second flow channel is formed between the outer ring of the disc-shaped baffle and the inner wall of the cavity, and the flow area of ​​the first flow channel is consistent with the flow area of ​​the second flow channel.

[0020] Optionally, the heat exchange tube bundle non-radial temperature difference heat exchanger further includes a tie rod, and the annular baffle and the disc-shaped baffle are fixed by the tie rod.

[0021] Optionally, the heat exchanger body comprises a shell and two pipe boxes, the two pipe boxes are respectively arranged at both ends of the shell, the shell side inlet and the shell side outlet are both arranged on the shell, and the tube side inlet and the tube side outlet are both arranged on the pipe boxes;

[0022] The heat exchanger body also includes two tube sheets, which are respectively arranged at the two ends of the shell, and the tube sheets are clamped between the tube box and the shell. The two ends of the heat exchange tube are respectively fixed to the two tube sheets.

[0023] The beneficial effects of the present invention are:

[0024] The heat exchange tube bundle without radial temperature difference proposed by the present invention comprises a heat exchanger body, a plurality of heat exchange tubes, a tube side distributor and two flow guide tubes. The heat exchanger body has a cavity, and a shell side inlet, a shell side outlet, a tube side inlet and a tube side outlet connected to the cavity are arranged on the heat exchanger body. The plurality of heat exchange tubes are arranged in the cavity, and the inlet of the heat exchange tube is connected to the tube side inlet, and the outlet of the heat exchange tube is connected to the tube side outlet. The tube side distributor is arranged in the cavity and is located upstream of the heat exchange tube in the flow direction of the tube side medium. The tube side distributor is used to make the tube side medium firstly diverted when entering the cavity, so that the tube side medium can flow into each heat exchange tube evenly. The two flow guide tubes are both sleeved outside the heat exchanger body, and one flow guide tube is connected to the shell side inlet, and the other flow guide tube is connected to the shell side outlet. The guide tube has a separated first cavity and multiple second cavities. The first cavity is connected to the inlet of the guide tube. The multiple second cavities are arranged at intervals along the circumference of the heat exchanger body. The guide tube is provided with multiple diversion ports and multiple flow ports. The shell inlet and shell outlet are both provided with multiple. The multiple second cavities are connected to the multiple shell inlets or multiple shell outlets through the multiple diversion ports in a one-to-one correspondence. One second cavity is connected to the second cavity through a flow port. When the shell medium enters the cavity, it will not directly impact the heat exchange tube along the radial direction of the heat exchanger body, but needs to pass through the guide tube first to realize bypass and diversion, so that the shell medium can also be in uniform and sufficient contact with multiple heat exchange tubes, so as to effectively avoid the problem of heat exchange tube breakage caused by the large temperature difference between the inner and outer tubes, and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a heat exchanger with a heat exchange tube bundle and no radial temperature difference provided by an embodiment of the present invention;

[0026] Figure 2 is a cross-sectional view of a heat exchanger with a heat exchange tube bundle and no radial temperature difference provided by an embodiment of the present invention;

[0027] Figure 3 is a schematic structural diagram of a guide tube provided by an embodiment of the present invention;

[0028] Figure 4 is an assembly diagram of a guide tube and a part of a heat exchanger body provided by an embodiment of the present invention;

[0029] Figure 5 is a cross-sectional view of a guide tube and a part of a heat exchanger body provided by an embodiment of the present invention;

[0030] Figure 6 is a temperature simulation diagram of a single-bow heat exchanger provided in an embodiment of the present invention;

[0031] Figure 7 It is a temperature simulation diagram of a heat exchanger without radial temperature difference in a heat exchange tube bundle provided by an embodiment of the present invention;

[0032] Figure 8The velocity simulation of the single-bow heat exchanger provided by the embodiment of the present invention is Figure 1 ;

[0033] Fig. 9 The velocity simulation of the single-bow heat exchanger provided by the embodiment of the present invention is Figure 2 ;

[0034] Fig.10 The speed simulation of the heat exchanger without radial temperature difference in the heat exchange tube bundle provided by the embodiment of the present invention is Figure 1 ;

[0035] Fig.11 The speed simulation of the heat exchanger without radial temperature difference in the heat exchange tube bundle provided by the embodiment of the present invention is Figure 2 .

[0036] In the figure:

[0037] 1. Heat exchanger body; 11. Tube box; 12. Tube sheet; 13. Shell; 101. Shell inlet; 102. Shell outlet; 103. Tube inlet; 104. Tube outlet;

[0038] 2. Heat exchange tube;

[0039] 3. Pipe distributor; 31. Sieve plate; 32. Cylinder;

[0040] 4. Guide tube; 41. First cavity; 42. Second cavity; 43. Diverter port; 44. Flow outlet; 45. Diverter ring; 46. Baffle; 47. Inlet;

[0041] 5. Ring-shaped baffle; 6. Disc-shaped baffle. DETAILED DESCRIPTION

[0042] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0047] like Figures 1 to 11 As shown, this embodiment provides a heat exchanger with a heat exchange tube bundle and no radial temperature difference, comprising a heat exchanger body 1, a plurality of heat exchange tubes 2, a tube side distributor 3 and two guide tubes 4. The heat exchanger body 1 has a cavity, and is provided with a shell side inlet 101, a shell side outlet 102, a tube side inlet 103 and a tube side outlet 104 connected to the cavity. The plurality of heat exchange tubes 2 are all arranged in the cavity, and the inlet of the heat exchange tube 2 is connected to the tube side inlet 103, and the outlet of the heat exchange tube 2 is connected to the tube side outlet 104, that is, the tube side medium can enter the heat exchange tube 2 through the tube side inlet 103, and perform heat exchange with the shell side medium entering the cavity through the shell side inlet 101, and then flow out of the heat exchanger body 1 through the outlet of the heat exchange tube 2 and the tube side outlet 104.

[0048] Specifically, Figure 2As shown, a plurality of heat exchange tubes 2 are evenly spaced along the circumference of the heat exchanger body 1. In order to avoid the situation that the flow rate in the heat exchange tube 2 located in the middle of the cavity is large and the flow rate in the heat exchange tube 2 located at the edge is small due to the direct entry of the tube-side medium into the heat exchange tube 2, in this embodiment, the tube-side distributor 3 is arranged in the cavity and upstream of the heat exchange tube 2 in the flow direction of the tube-side medium. The tube-side distributor 3 is used to make the tube-side medium flow into the cavity first, so that the tube-side medium can flow into each heat exchange tube 2 evenly. In order to further avoid the impact of the shell-side medium on the heat exchange tube 2 and avoid a large temperature difference between the inner and outer tubes of the heat exchange tube bundle, in this embodiment, two flow guide tubes 4 are both sleeved outside the heat exchanger body 1, and one flow guide tube 4 is connected to the shell-side inlet 101, and the other flow guide tube 4 is connected to the shell-side outlet 102, that is, the shell-side medium needs to pass through one flow guide tube 4 when entering the cavity, and also needs to pass through the other flow guide tube 4 when leaving the cavity. The function of the guide tube 4 is to prevent the shell-side medium from directly impacting the heat exchange tube 2 along the radial direction of the heat exchanger body 1 when entering the cavity, but to first pass through the guide tube 4 to achieve bypass and diversion, so that the shell-side medium can also be in uniform and full contact with multiple heat exchange tubes 2, so as to effectively avoid the problem of heat exchange tube 2 breakage caused by the large temperature difference between the inner and outer tubes, thereby extending the service life of the equipment.

[0049] Specifically, Figures 3 to 5As shown, the guide tube 4 has a separated first cavity 41 and a plurality of second cavities 42, the first cavity 41 is connected to the inlet 47 of the guide tube 4, the plurality of second cavities 42 are arranged at intervals along the circumference of the heat exchanger body 1, the guide tube 4 is provided with a plurality of diverter ports 43 and a plurality of flow ports 44, the shell side inlet 101 and the shell side outlet 102 are provided with a plurality of diverter ports 43, the plurality of second cavities 42 are connected to the plurality of shell side inlets 101 or the plurality of shell side outlets 102 one by one through the plurality of diverter ports 43, and one second cavity 42 is connected to the second cavity 42 through one flow port 44. In this embodiment, the guide tube 4 is an annular structure, the guide tube 4 has an annular guide cavity and an annular inner wall, a diverter ring 45 is arranged in the guide cavity, the diverter ring 45 is arranged coaxially with the guide tube 4, and the diverter ring 45 divides the guide cavity into the first cavity 41 and the second total cavity. A plurality of diverter ports 43 are arranged on the diverter ring 45, and the plurality of diverter ports 43 are arranged at intervals along the circumference of the heat exchanger body 1, and the shell-side medium entering the first chamber 41 can flow into the second main chamber through the plurality of diverter ports 43. A plurality of partition plates 46 are arranged in the second main chamber, and the plurality of partition plates 46 are arranged at intervals along the circumference of the heat exchanger body 1 to divide the second main chamber into a plurality of second chambers 42, that is, the shell-side medium in the first chamber 41 can flow into the plurality of second chambers 42 through the plurality of diverter ports 43. A plurality of flow ports 44 are arranged on the inner wall of the guide tube 4 at the position corresponding to the second total cavity, and one flow port 44 corresponds to one second cavity 42. A plurality of shell-side inlets 101 and a plurality of shell-side outlets 102 are arranged on the outer wall of the heat exchanger body 1 along its own circumference. The plurality of flow ports 44 of one guide tube 4 are connected to the plurality of shell-side inlets 101 in one-to-one correspondence, and the plurality of flow ports 44 of another guide tube 4 are connected to the plurality of shell-side outlets 102 in one-to-one correspondence, that is, the shell-side medium flowing into each second cavity 42 will flow into the cavity through the flow ports 44 and the shell-side inlet 101, or the shell-side medium in the cavity can flow back into the second cavity 42 through the shell-side outlet 102 and the flow ports 44. In this embodiment, Figure 3 As shown, the guide tube 4 is an annular structure and has no annular inner wall. The non-existent bottom wall of the second cavity 42 facing the heat exchanger body 1 forms a flow opening 44 , that is, there is no need to open a hole on the bottom wall of the second cavity 42 .

[0050] Specifically, Figure 6 That is, it is a temperature simulation diagram of a single-bend heat exchanger provided in this embodiment without a tube distributor 3 and a guide tube 4, Figure 8 and Fig. 9 That is, it is a velocity simulation diagram of the single-bow heat exchanger provided in this embodiment without the tube distributor 3 and the guide tube 4. Figure 7 That is, the temperature simulation diagram of the heat exchange tube bundle without radial temperature difference heat exchanger provided in this embodiment with the tube distributor 3 and the guide tube 4 is shown. Fig.10 and Fig.11This is the velocity simulation diagram of the heat exchange tube bundle without radial temperature difference heat exchanger provided in this embodiment with tube distributor 3 and guide tube 4. Figure 6 From the temperature simulation diagram, it can be seen that the overall average temperature difference between the center tube and the outer tube of this structure is about 6°C to 12°C, and along the flow direction of the tube medium, there is a large local temperature difference between the inner and outer tubes, especially at the beginning of the shell side. Figure 7 From the temperature simulation diagram, it can be seen that the temperature curves of the coaxial inner and outer tubes of this structure are almost consistent, and the overall average temperature difference is less than 1°C. Figure 8 and Fig. 9 From the velocity simulation diagram, it can be seen that the standard deviation of the heat exchange tube velocity of this structure is 0.5855. Fig.10 and Fig.11 It can be seen from the velocity simulation diagram that the standard deviation of the heat exchange tube velocity of this structure is 0.08092, that is, it can be clearly seen that the inner and outer tube velocity deviation of the heat exchange tube 2 of the heat exchange tube bundle without radial temperature difference heat exchanger is small, and the heat exchange effect is better.

[0051] Optionally, along the circumference of the heat exchanger body 1, the multiple diverter ports 43 and the multiple flow ports 44 include a first group arranged in a clockwise sequence and a second group arranged in a counterclockwise sequence, that is, a circle of diverter ports 43 arranged along the circumference of the heat exchanger body 1 can be divided into two groups, and a group of flow ports 44 arranged along the circumference of the heat exchanger body 1 can also be divided into two groups. The number of diverter ports 43 included in each group of diverter ports 43 is consistent with the number of flow ports 44 included in each group of flow ports 44, and a diverter port 43 and a flow port 44 are correspondingly connected, and the sum of the flow areas of the correspondingly connected diverter ports 43 and flow ports 44 increases first and then decreases. This change trend makes the flow area of ​​a diverter port 43 and a flow port 44 perpendicular to the position of the inlet 47 of the guide tube 4 the largest, and the flow area of ​​a diverter port 43 and a flow port 44 colinear with the position of the inlet 47 of the guide tube 4 is the smallest. By adjusting the flow areas of the branch ports 43 and the flow ports 44 through which the shell-side medium passes at different positions, the flow rates of the shell-side medium flowing into the cavity through different positions can be made consistent, thereby ensuring uniform heat exchange.

[0052] In specific implementation, the flow areas of the plurality of diverter ports 43 can be kept consistent, and only the flow area of ​​each group of flow ports 44 can be set to increase first and then decrease. Alternatively, the areas of the plurality of flow ports 44 can be kept consistent, and only the flow area of ​​each group of diverter ports 43 can be set to increase first and then decrease. In addition, the flow areas of the plurality of diverter ports 43 and the plurality of flow ports 44 can also be set to change.

[0053] Optionally, the sum of the flow areas of multiple flow openings 44 of a guide tube 4 is S1, and the sum of the flow areas of the shell-side inlet 101 and the sum of the flow areas of the shell-side outlet 102 are both S2, and the flow area of ​​the inlet 47 of a guide tube 4 is S3, S1>S3 and S2>2S3, so as to ensure the efficiency of the guide tube 4 in guiding the shell-side medium.

[0054] Furthermore, the tube-side distributor 3 includes a sieve plate 31, and the sieve plate 31 has a first area and a second area. The first area is the area where the heat exchange tube 2 is projected on the sieve plate 31 in its own axial direction, and the first area is not provided with sieve holes, while the second area is an area arranged around the periphery of the first area, and sieve holes are arranged on the second area, that is, the sieve holes are arranged at positions corresponding to the heat exchange tube 2, and the positions where the sieve holes are not arranged are not provided with heat exchange tubes 2. In specific implementation, there are multiple sieve holes, and the multiple sieve holes are evenly arranged. The diameter of each sieve hole ranges from 10mm to 20mm. The tube-side medium can flow around the periphery of the sieve plate 31, or flow out of the sieve holes in a jet state. The setting of the sieve holes can prevent the formation of vortices downstream of the sieve plate 31, and can make the outer fluid flow toward the center.

[0055] Optionally, the tube distributor 3 further includes a cylinder 32, which is sleeved on the outer periphery of the sieve plate 31, and the inner wall of the cylinder 32 is spaced from the outer periphery of the sieve plate 31, and the outer wall of the cylinder 32 is spaced from the inner wall of the cavity. When the tube medium flows through the tube distributor 3, it will flow in three areas. The first part of the tube medium flows from the outside of the cylinder 32, the second part of the tube medium flows from the gap between the cylinder 32 and the sieve plate 31, and the third part of the tube medium flows out from the sieve holes. Under the action of the tube distributor 3, it is ensured that the tube medium can flow into each heat exchange tube 2 evenly.

[0056] Optionally, the minimum interval between the inner wall of the cylinder 32 and the outer periphery of the sieve plate 31 is L1, 30mm≤L1≤50mm, which can ensure that the tube-side medium flows evenly into the heat exchange tube 2 while reducing the vibration of the heat exchange tube 2 and the scouring of the inner wall of the cavity by the tube-side medium.

[0057] In this embodiment, the heat exchanger body 1 includes a shell 13 and two tube boxes 11, the two tube boxes 11 are respectively arranged at the two ends of the shell 13, the shell side inlet 101 and the shell side outlet 102 are both arranged on the shell 13, and the tube side inlet 103 and the tube side outlet 104 are both arranged on the tube box 11. The heat exchanger body 1 also includes two tube sheets 12, the two tube sheets 12 are also respectively arranged at the two ends of the shell 13, and one tube sheet 12 is sandwiched between a tube box 11 and a shell 13, one tube sheet 12 and one tube box 11 form a tube side inlet cavity, and the other tube sheet 12 and the other tube box 11 form a tube side outlet cavity, and the two ends of the heat exchange tube 2 are respectively extended to the two tube sheets 12 for fixing, and the inlet end of the heat exchange tube 2 extends into the tube side inlet cavity, and the outlet end of the heat exchange tube 2 extends into the tube side outlet cavity. In specific implementation, the tube box 11, the shell 13, the tube sheet 12 and the heat exchange tube 2 are all welded.

[0058] Furthermore, the heat exchange tube bundle without radial temperature difference heat exchanger also includes baffles, which include annular baffles 5 and disc-shaped baffles 6. The annular baffles 5 and disc-shaped baffles 6 are both located in the cavity at the shell 13 and sleeved on the heat exchange tube 2. The annular baffles 5 and disc-shaped baffles 6 are alternately arranged along the circumference of the heat exchange tube 2. The baffles are used to enable the shell-side medium to be baffled when flowing in the cavity, so that the shell-side medium and the heat exchange tube 2 can be fully in contact, that is, compared with the prior art, the flow dead zone is reduced at this time, the heat exchange of the shell-side medium and the heat exchange tube 2 with the same fluid area is the same, and the temperature difference between the inner and outer tubes of the heat exchange tube 2 is reduced.

[0059] In addition, there is at least one annular baffle 5 upstream and downstream of each disc-shaped baffle 6, that is, the baffles at the two ends of the heat exchange tube 2 are both annular baffles 5. The annular baffles 5 can make the shell-side medium flow toward the center, thereby reducing the impact of the shell-side medium on the heat exchange tube 2 at both ends of the shell 13.

[0060] Optionally, the outer ring of the annular baffle 5 abuts against the inner wall of the cavity, the inner ring of the annular baffle 5 forms a first flow channel, and a second flow channel is formed between the outer ring of the disc-shaped baffle 6 and the inner wall of the cavity. The flow area of ​​the first flow channel is consistent with the flow area of ​​the second flow channel to ensure that the flow velocity of the shell-side medium is consistent at all locations in the cavity, thereby ensuring uniform heat exchange and reducing pressure loss.

[0061] Optionally, the heat exchange tube bundle without radial temperature difference heat exchanger further comprises a tie rod, through which the annular baffle plate 5 and the disc-shaped baffle plate 6 are fixed. In specific implementation, the tie rod extends along the axial direction of the heat exchanger body 1 and both ends are respectively fixed to the tube sheets 12 at both ends, and the tie rod passes through the annular baffle plate 5 and the disc-shaped baffle plate 6.

[0062] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. The heat exchange tube bundle has no radial temperature difference heat exchanger, characterized in that: include: A heat exchanger body (1), the heat exchanger body (1) having a cavity, the heat exchanger body (1) being provided with a shell side inlet (101), a shell side outlet (102), a tube side inlet (103) and a tube side outlet (104) which are in communication with the cavity; A plurality of heat exchange tubes (2) are arranged in the cavity, wherein the inlet of the heat exchange tube (2) is connected to the tube side inlet (103), and the outlet of the heat exchange tube (2) is connected to the tube side outlet (104); A tube-side distributor (3) is arranged in the cavity, the tube-side distributor (3) is located upstream of the heat exchange tube (2) in the flow direction of the tube-side medium, and the tube-side distributor (3) is used to make the tube-side medium flow evenly into each of the heat exchange tubes (2); Two flow guide cylinders (4) are sleeved outside the heat exchanger body (1), one of the flow guide cylinders (4) is connected to the shell side inlet (101), and the other of the flow guide cylinders (4) is connected to the shell side outlet (102); The guide tube (4) has a separated first chamber (41) and a plurality of second chambers (42); the first chamber (41) is connected to an inlet (47) of the guide tube (4); the plurality of second chambers (42) are arranged at intervals along the circumference of the heat exchanger body (1); the guide tube (4) is provided with a plurality of flow diversion ports (43) and a plurality of flow passage ports (44); a plurality of the shell-side inlet (101) and a plurality of the shell-side outlet (102) are both provided; the plurality of the second chambers (42) are connected to the plurality of the shell-side inlets (101) or the plurality of the shell-side outlets (102) in a one-to-one correspondence through the plurality of flow passage ports (44); and one of the second chambers (42) is connected to the first chamber (41) through one of the flow diversion ports (43).

2. The heat exchange tube bundle without radial temperature difference according to claim 1, characterized in that: Along the circumference of the heat exchanger body (1), the plurality of diverter ports (43) and the plurality of flow ports (44) each include a first group arranged in a clockwise sequence and a second group arranged in a counterclockwise sequence. The sum of the flow areas of the corresponding diverter ports (43) and the flow ports (44) in each group of diverter ports (43) and each group of flow ports (44) increases first and then decreases. The flow areas of the diverter ports (43) and the flow ports (44) perpendicular to the position of the inlet (47) of the guide tube (4) are the largest.

3. The heat exchange tube bundle without radial temperature difference according to claim 1, characterized in that: The sum of the flow areas of the multiple branch ports (43) of one guide tube (4) is S1, the sum of the flow areas of the shell side inlet (101) and the sum of the flow areas of the shell side outlet (102) are both S2, and the flow area of ​​the inlet (47) of one guide tube (4) is S3, S1>S3 and S2>2S3.

4. The heat exchange tube bundle without radial temperature difference according to claim 1, characterized in that: The tube-side distributor (3) comprises a sieve plate (31), wherein the sieve plate (31) has a first zone and a second zone arranged around the first zone, sieve holes are arranged on the second zone, and the sieve holes are not arranged on the first zone, and the first zone is the area where the heat exchange tube (2) is projected onto the sieve plate (31) in its own axial direction.

5. The heat exchange tube bundle without radial temperature difference according to claim 4, characterized in that: The tube-side distributor (3) further comprises a cylinder (32), wherein the cylinder (32) is sleeved on the outer circumference of the sieve plate (31), and there is a gap between the inner wall of the cylinder (32) and the outer circumference of the sieve plate (31), and between the outer wall of the cylinder (32) and the inner wall of the cavity.

6. The heat exchange tube bundle without radial temperature difference according to claim 5, characterized in that: The minimum distance between the inner wall of the cylinder (32) and the outer periphery of the sieve plate (31) is L1, 30 mm ≤ L1 ≤ 50 mm.

7. The heat exchange tube bundle without radial temperature difference according to claim 1, characterized in that: The heat exchange tube bundle without radial temperature difference heat exchanger also includes a baffle, which is located in the cavity and is sleeved on the heat exchange tube (2), and the baffle includes an annular baffle (5) and a disc-shaped baffle (6). The annular baffle (5) and the disc-shaped baffle (6) are alternately arranged along the axial direction of the heat exchange tube (2), and there is at least one annular baffle (5) upstream and downstream of each disc-shaped baffle (6).

8. The heat exchange tube bundle without radial temperature difference according to claim 7, characterized in that: The outer ring of the annular baffle (5) abuts against the inner wall of the cavity, the inner ring of the annular baffle (5) forms a first flow channel, and a second flow channel is formed between the outer ring of the disc-shaped baffle (6) and the inner wall of the cavity, and the flow area of ​​the first flow channel is consistent with the flow area of ​​the second flow channel.

9. The heat exchange tube bundle without radial temperature difference according to claim 7, characterized in that: The heat exchange tube bundle non-radial temperature difference heat exchanger also includes a tie rod, and the annular baffle (5) and the disc-shaped baffle (6) are fixed by the tie rod.

10. The heat exchange tube bundle without radial temperature difference according to claim 1, characterized in that: The heat exchanger body (1) comprises a shell (13) and two pipe boxes (11), wherein the two pipe boxes (11) are respectively arranged at two ends of the shell (13), the shell-side inlet (101) and the shell-side outlet (102) are both arranged on the shell (13), and the tube-side inlet (103) and the tube-side outlet (104) are both arranged on the pipe boxes (11); The heat exchanger body (1) further comprises two tube sheets (12), the two tube sheets (12) being respectively arranged at the two ends of the shell (13), the tube sheets (12) being clamped between the tube box (11) and the shell (13), and the two ends of the heat exchange tube (2) being respectively fixed to the two tube sheets (12).

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