Heat exchanger without radial temperature difference of heat exchange tube bundle

Abstract

The utility model relates to the technical field of heat exchangers, and discloses a heat exchanger without radial temperature difference of a heat exchange tube bundle, 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 utility model relates to the technical field of heat exchangers, in particular to a heat exchange tube bundle without radial temperature difference. Background Art

[0002] Shell-and-tube heat exchangers are widely used in industries such as energy, medicine, power, and chemicals, primarily to ensure the proper operation of industrial equipment. Most traditional shell-and-tube heat exchangers utilize single-bow baffles for support. This support structure can easily create heat transfer dead zones behind the baffles in the shell side. Furthermore, as the fluid flows horizontally through the tube bundle, Karman vortex streets can form behind the heat exchange tubes, causing fluid-induced vibrations in the tubes. Because the fluid flow constantly switches between longitudinal and transverse directions, the velocity changes dramatically, significantly increasing 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 deflection structure. The cold fluid forms a large velocity impact around the anti-impact baffle and forms a large deviation flow behind the deflector. 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. Utility Model Content

[0005] The purpose of the utility model is to provide a heat exchanger with a heat exchange tube bundle and no radial temperature difference, so as to solve the problem of tube cracking caused by large temperature difference between the 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 utility model 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 communicating with the cavity;

[0009] a plurality of heat exchange tubes disposed in the cavity, wherein the inlets of the heat exchange tubes are connected to the tube-side inlet, and the outlets of the heat exchange tubes are connected to the tube-side outlet;

[0010] a tube-side distributor, disposed in the cavity, the tube-side distributor being located upstream of the heat exchange tube in the flow direction of the tube-side medium, and configured to uniformly flow the tube-side medium 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 of the guide cylinders is connected to the shell side outlet;

[0012] The guide tube has a separated first cavity and multiple second cavities, the first cavity is connected to the inlet of the guide tube, and 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, and the shell-side inlet and the shell-side outlet are both provided with multiple. The multiple second cavities 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 cavity is connected to the first cavity through one diversion 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 sequence and a second group arranged in a counterclockwise sequence, 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 ​​the diverter port and the flow port perpendicular to the position of the inlet of the guide tube is the largest.

[0014] Optionally, the sum of the flow areas of the multiple diversion 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, which has a first zone and a second zone arranged around the outer periphery of the first zone, sieve holes are set on the second zone, and the sieve holes are not set on the first zone. 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 non-radial temperature difference heat exchanger also includes a baffle, which is located in the cavity and is sleeved on the heat exchange tube. The baffle includes an annular baffle and a disc-shaped baffle. 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 includes 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 further includes two tube sheets, which are respectively arranged at both ends of the shell. The tube sheets are clamped between the tube box and the shell, and both ends of the heat exchange tube are respectively fixed to the two tube sheets.

[0023] The beneficial effects of the utility model are:

[0024] The heat exchange tube bundle without radial temperature difference proposed in 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 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. The plurality of heat exchange tubes are arranged in the cavity, and the inlets of the heat exchange tubes are connected to the tube-side inlets, and the outlets of the heat exchange tubes are connected to the tube-side outlets. The tube-side distributor is arranged in the cavity and is located upstream of the heat exchange tubes in the flow direction of the tube-side medium. The tube-side distributor is used to divert the tube-side medium before entering the cavity, so that the tube-side medium can flow evenly into each heat exchange tube. The two flow guide tubes are both mounted outside the heat exchanger body, with one flow guide tube connected to the shell-side inlet and the other flow guide tube connected to the shell-side outlet. The draft tube has a separate first chamber and multiple second chambers. The first chamber is connected to the inlet of the draft tube, and the multiple second chambers are spaced apart along the circumference of the heat exchanger body. The draft tube is provided with multiple diverter ports and multiple flow ports. There are multiple shell-side inlets and multiple shell-side outlets. The multiple second chambers are connected to the multiple shell-side inlets or multiple shell-side outlets through the multiple diverter ports in a one-to-one correspondence. Each second chamber is connected to the second chamber through a single flow port. When the shell-side medium enters the cavity, it does not directly impact the heat exchange tubes in the radial direction of the heat exchanger body. Instead, it must first pass through the draft tube to achieve circumferential flow and diversion. This ensures that the shell-side medium can also have uniform and sufficient contact with the multiple heat exchange tubes, effectively avoiding the problem of heat exchange tube breakage caused by large temperature differences between the inner and outer tubes, and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This 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 utility model;

[0026] Figure 2 This 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 utility model;

[0027] Figure 3 This is a schematic structural diagram of the guide tube provided by an embodiment of the utility model;

[0028] Figure 4 This is an assembly diagram of the guide tube and part of the heat exchanger body provided by an embodiment of the utility model;

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

[0030] Figure 6 This is a temperature simulation diagram of a single-bow heat exchanger provided by an embodiment of the present utility model;

[0031] Figure 7 This 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 utility model;

[0032] Figure 8 The speed simulation of the single bow heat exchanger provided by the embodiment of the utility model is Figure 1 ;

[0033] Figure 9 The speed simulation of the single bow heat exchanger provided by the embodiment of the utility model is Figure 2 ;

[0034] Figure 10 The speed simulation of the heat exchanger without radial temperature difference provided by the embodiment of the utility model is Figure 1 ;

[0035] Figure 11 The speed simulation of the heat exchanger without radial temperature difference provided by the embodiment of the utility model is Figure 2 .

[0036] In the picture:

[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. Tube 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. Partition plate; 47. Inlet;

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

[0042] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly understood, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of it.

[0043] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

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

[0045] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0046] The technical solution of the present invention will be 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, multiple heat exchange tubes 2, a tube-side distributor 3, and two draft 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, all of which are connected to the cavity. The multiple heat exchange tubes 2 are disposed within the cavity, with the inlets of the heat exchange tubes 2 communicating with the tube-side inlets 103, and the outlets of the heat exchange tubes 2 communicating with the tube-side outlets 104. In other words, the tube-side medium can enter the heat exchange tubes 2 through the tube-side inlets 103, exchange heat with the shell-side medium entering the cavity through the shell-side inlets 101, and then flow out of the heat exchanger body 1 through the outlets of the heat exchange tubes 2 and the tube-side outlets 104.

[0048] Specifically, if Figure 2As shown, multiple heat exchange tubes 2 are evenly spaced along the circumference of the heat exchanger body 1. To prevent the tube-side medium from directly entering the heat exchange tubes 2, resulting in a high flow rate in the heat exchange tubes 2 located in the middle of the cavity and a low flow rate in the heat exchange tubes 2 located at the edge, in this embodiment, a tube-side distributor 3 is disposed within the cavity and upstream of the heat exchange tubes 2 in the direction of the tube-side medium flow. The tube-side distributor 3 divides the tube-side medium before it enters the cavity, thereby ensuring that the tube-side medium flows evenly into each heat exchange tube 2. To further prevent the shell-side medium from impacting the heat exchange tubes 2 and avoid a large temperature difference between the inner and outer tubes of the heat exchange tube bundle, in this embodiment, two draft tubes 4 are sleeved onto the exterior of the heat exchanger body 1, one draft tube 4 communicating with the shell-side inlet 101 and the other communicating with the shell-side outlet 102. This means that the shell-side medium must first pass through one draft tube 4 when entering the cavity and must also pass through the other draft tube 4 when leaving the cavity. The function of the flow 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. Instead, it needs to pass through the flow guide tube 4 to achieve bypass and diversion, so that the shell-side medium can also be in uniform and sufficient contact with multiple heat exchange tubes 2, so as to effectively avoid the problem of heat exchange tube 2 breaking due to the large temperature difference between the inner and outer tubes, thereby extending the service life of the equipment.

[0049] Specifically, if Figures 3 to 5As shown, the guide tube 4 has a separated first chamber 41 and multiple second chambers 42. The first chamber 41 is connected to the inlet 47 of the guide tube 4. The multiple second chambers 42 are arranged at intervals along the circumference of the heat exchanger body 1. The guide tube 4 is provided with multiple diverter ports 43 and multiple flow ports 44. There are multiple shell-side inlets 101 and shell-side outlets 102. The multiple second chambers 42 are connected to the multiple shell-side inlets 101 or multiple shell-side outlets 102 through the multiple diverter ports 43 in a one-to-one correspondence. One second chamber 42 is connected to the second chamber 42 through one flow port 44. In this embodiment, the guide tube 4 is an annular structure, having an annular guide chamber and an annular inner wall. A diverter ring 45 is provided in the guide chamber. The diverter ring 45 is coaxially arranged with the guide tube 4 and divides the guide chamber into the first chamber 41 and the second total chamber. The diverter ring 45 is provided with a plurality of diverter ports 43, which are spaced apart along the circumference of the heat exchanger body 1. Shell-side media entering the first chamber 41 can flow into the second main chamber through the plurality of diverter ports 43. The second main chamber is provided with a plurality of partitions 46, which are spaced apart 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 media in the first chamber 41 can flow into the plurality of second chambers 42 through the plurality of diverter ports 43. The inner wall of the guide tube 4 is provided with a plurality of flow ports 44 at positions corresponding to the second total cavity, and one flow port 44 corresponds to one second cavity 42. The outer wall of the heat exchanger body 1 is provided with a plurality of shell-side inlets 101 and a plurality of shell-side outlets 102 along its own circumference. The plurality of flow ports 44 of one guide tube 4 is connected to the plurality of shell-side inlets 101 in a one-to-one correspondence, and the plurality of flow ports 44 of another guide tube 4 is connected to the plurality of shell-side outlets 102 in a 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, as Figure 3 As shown, the guide tube 4 is an annular structure and has no annular inner wall. The second cavity 42 forms a flow opening 44 toward the non-existent bottom wall of the heat exchanger body 1 , which means that there is no need to open a hole on the bottom wall of the second cavity 42 .

[0050] Specifically, Figure 6 This is a temperature simulation diagram of a single-bow heat exchanger provided in this embodiment without a tube distributor 3 and a draft tube 4. Figure 8 and Figure 9 That is, it is a velocity simulation diagram of the single-bow heat exchanger provided in this embodiment without the tube-side distributor 3 and the draft tube 4. Figure 7 This is a temperature simulation diagram of a heat exchanger without radial temperature difference in a heat exchange tube bundle provided in this embodiment, which is provided with a tube distributor 3 and a draft tube 4. Figure 10 and Figure 11This is the velocity simulation diagram of the heat exchange tube bundle without radial temperature difference provided by this embodiment, which is provided with tube distributor 3 and guide tube 4. Figure 6 From the temperature simulation diagram, we can see that the overall average temperature difference between the center tube and the outer tube of this structure is about 6℃ to 12℃, 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, we can see that the temperature curves of the inner and outer coaxial tubes of this structure are almost identical, and the overall average temperature difference is less than 1°C. Figure 8 and Figure 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. Figure 10 and Figure 11 It can be seen from the velocity simulation diagram that the standard deviation of the heat exchange tube flow rate of this structure is 0.08092, that is, it can be clearly seen that the flow rate deviation of the inner and outer tubes 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 each 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 first increases and then decreases. This change trend results in 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 being the largest, while the flow area of ​​a diverter port 43 and a flow port 44 collinear with the position of the inlet 47 of the guide tube 4 being the smallest. By adjusting the flow areas of the diversion ports 43 and the flow ports 44 at different positions through which the shell-side medium passes, the flow rates of the shell-side medium flowing into the cavity at different positions can be made consistent, thereby ensuring uniform heat exchange.

[0052] In a specific implementation, the flow areas of the multiple diversion openings 43 can be kept consistent, while the flow area of ​​each group of flow-through openings 44 can be increased first and then decreased. Alternatively, the areas of the multiple flow-through openings 44 can be kept consistent, while the flow area of ​​each group of diversion openings 43 can be increased first and then decreased. Furthermore, the flow areas of both the multiple diversion openings 43 and the multiple flow-through openings 44 can be varied.

[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, which has a first zone and a second zone. The first zone is the area where the heat exchange tube 2 is projected onto the sieve plate 31 in its own axial direction, and is not provided with sieve holes. The second zone is an area arranged around the periphery of the first zone, and is provided with sieve holes. That is, the sieve holes are provided at the positions corresponding to the heat exchange tube 2, and the positions without sieve holes are also not provided with heat exchange tube 2. In specific implementation, there are multiple sieve holes, which 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 provision of the sieve holes prevents the formation of vortices downstream of the sieve plate 31 and allows the outer fluid to flow toward the center.

[0055] Optionally, the tube-side distributor 3 further includes a cylinder 32, which is sleeved around the outer periphery of the sieve plate 31. The inner wall of the cylinder 32 is spaced apart from the outer periphery of the sieve plate 31, and the outer wall of the cylinder 32 is also spaced apart from the inner wall of the cavity. When flowing through the tube-side distributor 3, the tube-side medium is divided into three regions: the first portion flows from the outside of the cylinder 32, the second portion flows through the gap between the cylinder 32 and the sieve plate 31, and the third portion flows out of the sieve holes. This tube-side distributor 3 ensures that the tube-side medium flows evenly into each heat exchange tube 2.

[0056] Optionally, the minimum distance 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 comprises a shell 13 and two tube boxes 11, one located at each end of the shell 13. The shell-side inlet 101 and shell-side outlet 102 are both located on the shell 13, while the tube-side inlet 103 and tube-side outlet 104 are both located on the tube boxes 11. The heat exchanger body 1 also comprises two tube sheets 12, one located at each end of the shell 13. One tube sheet 12 is sandwiched between one tube box 11 and the shell 13. One tube sheet 12 forms a tube-side inlet cavity with one tube box 11, while the other tube sheet 12 forms a tube-side outlet cavity with the other tube box 11. Heat exchange tubes 2 extend to and are secured to the two tube sheets 12 at their respective ends. The inlet end of the heat exchange tube 2 extends into the tube-side inlet cavity, while the outlet end of the heat exchange tube 2 extends into the tube-side outlet cavity. In practice, the tube boxes 11, shell 13, tube sheets 12, and heat exchange tubes 2 are all welded together.

[0058] Furthermore, the heat exchange tube bundle heat exchanger without radial temperature difference further includes baffles, which include annular baffles 5 and disc-shaped baffles 6. Both the annular baffles 5 and the disc-shaped baffles 6 are located in the cavity at the shell 13 and are sleeved on the heat exchange tubes 2. The annular baffles 5 and the disc-shaped baffles 6 are alternately arranged along the circumference of the heat exchange tubes 2. The baffles are used to deflect the shell-side medium as it flows in the cavity, allowing full contact between the shell-side medium and the heat exchange tubes 2. That is, compared with the prior art, the flow dead zone is reduced, the heat exchange between the shell-side medium and the heat exchange tubes 2 of the same fluid area is the same, and the temperature difference between the inner and outer tubes of the heat exchange tubes 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 both ends of the heat exchange tube 2 are annular baffles 5. The annular baffles 5 can make the shell-side medium flow toward the center, which can reduce 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, to ensure uniform heat exchange and reduce pressure loss.

[0061] Optionally, the heat exchanger with a heat exchange bundle and no radial temperature difference further includes tie rods, by which the annular baffles 5 and the disc-shaped baffles 6 are secured. Specifically, the tie rods extend axially along the heat exchanger body 1 and are secured at both ends to the tube sheets 12 at either end. The tie rods pass through the annular baffles 5 and the disc-shaped baffles 6.

[0062] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications are possible without departing from the spirit and scope of the present invention. Such changes and modifications are within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. Heat exchange tube bundle without 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) communicating 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 communicated with the tube-side inlet (103), and the outlet of the heat exchange tube (2) is communicated with 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 guide tubes (4) are sleeved outside the heat exchanger body (1), one of the guide tubes (4) is connected to the shell-side inlet (101), and the other of the guide tubes (4) is connected to the shell-side outlet (102); The guide tube (4) has a separated first cavity (41) and a plurality of second cavities (42), the first cavity (41) being connected to the inlet (47) of the guide tube (4), the plurality of second cavities (42) being arranged at intervals along the circumference of the heat exchanger body (1), the guide tube (4) being provided with a plurality of diversion ports (43) and a plurality of flow ports (44), the shell-side inlet (101) and the shell-side outlet (102) being provided with a plurality of the second cavities (42) being 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 ports (44), and one second cavity (42) being connected to the first cavity (41) through one diversion port (43).

2. The heat exchange tube bundle non-radial temperature difference heat exchanger 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 order and a second group arranged in a counterclockwise order. The sum of the flow areas of the corresponding connected diverter ports (43) and the flow ports (44) in each group of diverter ports (43) and each group of flow ports (44) first increases and then decreases. The flow area of ​​the diverter port (43) and the flow port (44) perpendicular to the position of the inlet (47) of the guide tube (4) is the largest.

3. The heat exchange tube bundle without radial temperature difference heat exchanger according to claim 1, characterized in that: The sum of the flow areas of the plurality of diversion ports (43) of a 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 a guide tube (4) is S3, S1>S3 and S2>2S3.

4. The heat exchange tube bundle without radial temperature difference heat exchanger 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 area and a second area arranged around the periphery of the first area, wherein sieve holes are provided on the second area, and the sieve holes are not provided on the first area, wherein the first area is the area of ​​the heat exchange tube (2) projected onto the sieve plate (31) in its own axial direction.

5. The heat exchange tube bundle non-radial temperature difference heat exchanger according to claim 4, characterized in that: The tube-side distributor (3) further comprises a cylinder (32), which is sleeved on the outer periphery of the sieve plate (31), and there is a gap between the inner wall of the cylinder (32) and the outer periphery of the sieve plate (31), as well as between the outer wall of the cylinder (32) and the inner wall of the cavity.

6. The heat exchange tube bundle non-radial temperature difference heat exchanger 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, 30mm≤L1≤50mm.

7. The heat exchange tube bundle without radial temperature difference heat exchanger according to claim 1, characterized in that: The heat exchange tube bundle non-radial temperature difference heat exchanger further comprises a baffle, wherein the baffle is located in the cavity and is sleeved on the heat exchange tube (2), and the baffle comprises 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 non-radial temperature difference heat exchanger 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 heat exchanger according to claim 7, characterized in that: The heat exchange tube bundle non-radial temperature difference heat exchanger further comprises 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 heat exchanger 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 both 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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