Combined heat exchanger and working method thereof

Abstract

The present invention belongs to the technical field of heat exchangers, and in particular, relates to a combined heat exchanger and a working method thereof, comprising: an outer shell and an inner cylinder, forming an outer space, which is divided into a first section and a second section by a partition; a spiral coil, which is coiled around the outer periphery of the inner cylinder; a tube unit, which forms a corrugated tube; a plurality of circulating tubes, wherein the first group is distributed in the second section, and the two ends are fixed by a first tube sheet, and the two first tube sheets separate the outer shell in the first section, and the second group is distributed on one side of the inner cylinder corresponding to the first section, and the two ends of the second group are fixed by a second tube sheet, and the two second tube sheets separate the inner shell in the inner cylinder. The present invention integrates multiple devices into an integral structure, reduces costs, makes the flow of the medium more compact, improves heat exchange efficiency, and effectively solves the problems of flow resistance and noise; the effective reduction of tube connection points improves the processing and installation efficiency of the equipment, and reduces the occurrence of problems during use.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat exchangers, and in particular relates to a combined heat exchanger and a working method thereof. Background Art

[0002] In existing heat exchanger usage scenarios, it is a common working situation that multiple devices of different models participate in the heat exchange process between two media according to the set connection relationship.

[0003] exist Figure 1 A combination of a hairpin heat exchanger and a shell and tube heat exchanger is shown in FIG. 1 , which includes:

[0004] At least two hairpin heat exchangers 04 are arranged in parallel, and the first medium 01 is divided into different branches 011 and enters the tube side of each hairpin heat exchanger 01 synchronously, and exchanges heat with the second medium 02 in the shell side. After the heat exchange is completed, the first medium 01 is collected and sent to the next device;

[0005] A plurality of shell and tube heat exchangers 05 are connected in series in the lower passage, and the collected first medium 01 enters the shell side of each shell and tube heat exchanger 05 in turn, and exchanges heat with the third medium 03 in the tube side. After the heat exchange is completed, the first medium 01 flows out from the shell side of the last shell and tube heat exchanger 05.

[0006] At present, the comprehensive use of multiple hairpin heat exchangers 04 and shell and tube heat exchangers 05 in the above form has at least the following problems:

[0007] The large number of equipment will incur high costs in terms of equipment processing, equipment transportation and equipment installation; the medium flow path is long, which not only affects the heat exchange efficiency, but also brings greater noise and energy consumption due to flow resistance; the difficulty of pipeline connection is large, and the required connection method is established between different equipment through complex pipelines, which increases the number of failure points during use. The increase in floor space brought by multiple equipment also invisibly increases the difficulty of finding and solving problem points. Summary of the invention

[0008] The present invention provides a combined heat exchanger and a working method thereof, which can effectively solve the problems in the background technology.

[0009] To achieve the above object, the technical solution of the present invention is as follows:

[0010] A combined heat exchanger, comprising:

[0011] An outer shell sealed at both ends by end caps, and an inner cylinder disposed in the outer shell and open at both ends, a through peripheral space formed between the outer shell and the inner cylinder, an annular partition disposed in the peripheral space for dividing the peripheral space into an isolated first section and a second section in the length direction, and a first through opening connecting the inside and outside of the first section and a second through opening connecting the inside and outside of the second section are disposed on both sides of the partition respectively;

[0012] At least one spiral coil, coiled around the outer periphery of the inner cylinder in the first section, and connected to the outside of the outer shell through pipelines at both ends of the first section;

[0013] a tube unit, arranged at one side of the inner cylinder corresponding to the first section, comprising a plurality of straight tube sections parallel and juxtaposed along the length direction of the outer shell, and a curved tube section of a corrugated tube body formed by sequentially connecting the straight tube sections, wherein the length direction of the straight tube section is perpendicular to the length direction of the outer shell, and both ends of the tube unit are connected to the outside of the outer shell through pipelines;

[0014] A plurality of flow tubes are divided into two groups and open at both ends, the flow tubes extend along the length direction of the outer shell, the first group is distributed in the second section, the two ends of the first group are fixed by first tube sheets respectively, and the two first tube sheets separate an outer shell side in the first section, the second group is distributed on a side of the inner cylinder corresponding to the first section, the two ends of the second group are fixed by second tube sheets respectively, and the two second tube sheets separate an inner shell side in the inner cylinder, the outer shell side and the inner shell side are connected through a third through port located on the inner cylinder, and the inner shell side and the outer shell side are respectively connected to the outside of the outer shell through pipelines on the side close to the partition.

[0015] Furthermore, at least two spiral coils are provided, and the diameter of the spiral line gradually increases to form an inner and outer layered structure, and the end of each layered structure is connected to the outside of the shell through a common pipeline.

[0016] Furthermore, the pitch of the spiral coil and the cross-sectional dimensions of the tube body of each layer are the same.

[0017] Furthermore, at least two tube units are provided, and an end of each tube unit is connected to the outside of the shell through a common pipeline.

[0018] Furthermore, the first tube sheet and the second tube sheet located at one side of the end of the inner cylinder are integrated, and one open end of the inner cylinder is sealed.

[0019] Furthermore, the third through opening is located at the end of the inner cylinder, which is an area surrounded by a local retracted position of the end of the inner cylinder and an integrated tube sheet.

[0020] Furthermore, the combined heat exchanger is used vertically, with the first section located at the top and the second section located at the bottom.

[0021] Furthermore, the partition has an arched cross-section and protrudes toward the bottom to form a receiving groove.

[0022] Furthermore, a plurality of guide plates are arranged in parallel and at intervals in the inner shell side and / or the outer shell side;

[0023] Two adjacent guide plates are staggered to limit the flow path of the medium to a wave shape.

[0024] The working method of the combined heat exchanger as described above simultaneously executes the medium circulation in the following paths;

[0025] A first medium is introduced into the path connecting the second section, the interior of the inner cylinder and the first section, the first medium flows in from the second through-hole, flows out from the first through-hole, and passes through each of the flow tubes in the inner cylinder and the second section;

[0026] A second medium is introduced into the path connected by the inner shell side, the third through-hole and the outer shell side, wherein the second medium enters from the inner shell side and flows out from the outer shell side;

[0027] A third medium is introduced into the path inside the spiral coil, the third medium enters from an end close to the partition plate and flows out from an end close to the end cap;

[0028] A fourth medium is introduced into the path inside the tube unit, the fourth medium flows in from an end close to the end cap and flows out from an end close to the partition plate;

[0029] The first medium performs heat exchange with the second medium, the third medium and the fourth medium respectively, wherein the second medium, the third medium and the fourth medium are different from each other, or at least two of them are the same.

[0030] The technical solution of the present invention can achieve the following technical effects:

[0031] The present invention integrates the original multiple devices into an overall structure contained in the same housing. By reducing the number of devices, the relevant costs are greatly reduced, and the demand for installation sites can be effectively reduced. In the overall device structure, the flow of the medium is more compact, which improves the heat exchange efficiency while effectively solving the problems of flow resistance and noise. The effective reduction of the pipe body connection points improves the processing and installation efficiency of the equipment on the one hand, and reduces the occurrence of problems during use on the other. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the connection form of the hairpin heat exchanger and the shell and tube heat exchanger in the background technology;

[0034] Figure 2 It is a schematic diagram of the combined structure of the outer shell, inner cylinder and partition (including part of the medium flow path);

[0035] Figure 3 It is a structural schematic diagram of a combined heat exchanger;

[0036] Figure 4 It is a schematic diagram of the structure of the side where the spiral coil and the tube unit are located in the combined heat exchanger;

[0037] Figure 5 for Figure 4 Schematic diagram of the flow paths of the two heat exchange media in the first section;

[0038] Figure 6 for Figure 3 A partial enlarged view of the middle A;

[0039] Figure 7 for Figure 4 Schematic diagram of the flow paths of the two heat exchange media in the middle inner cylinder;

[0040] Figure 8 It is a structural schematic diagram of the side where the flow tube body is located in the combined heat exchanger;

[0041] Fig. 9 for Figure 8 Schematic diagram of the flow paths of the two heat exchange media in the middle inner cylinder;

[0042] Fig.10 for Figure 8 Schematic diagram of the flow paths of the two heat exchange media in the second section;

[0043] Fig.11 A schematic diagram showing the removal of the spiral coil and the tube unit relative to the heat exchanger;

[0044] Fig.12 It is a schematic diagram of the middle section of the combined heat exchanger where the partition is located (including part of the medium flow path);

[0045] Fig.13 for Fig.12A partial enlarged view of point B in the middle;

[0046] Fig.14 This is a schematic diagram of the restriction of the flow path of the medium by the guide plate;

[0047] Fig.15 for Fig.11 A partial enlarged view of point C in the middle (including the shell-side medium flow path);

[0048] Reference numerals: 01, first medium; 011, branch; 02, second medium; 03, third medium; 04, hairpin heat exchanger; 05, shell and tube heat exchanger;

[0049] 1. Shell; 11. End cap; 2. Inner cylinder; 21. Third through-hole; 3. Peripheral space; 31. First section; 31a. First through-hole; 32. Second section; 32a. Second through-hole; 4. Partition; 5. Spiral coil; 51. First pipeline; 52. Second pipeline; 6. Tube unit; 61. Straight section; 62. Bend section; 63. Third pipeline; 64. Fourth pipeline; 7. Circulation tube; 8. First tube sheet; 81. Shell side; 81a. Fifth pipeline; 81b. First guide plate; 10. Second tube sheet; 101. Inner shell side; 101a. Sixth pipeline; 101b. Second guide plate. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0052] Embodiment 1

[0053] like Figures 1 to 15 As shown, a combined heat exchanger comprises:

[0054] An outer shell 1 sealed at both ends by a sealing head 11, and an inner cylinder 2 disposed in the outer shell 1 and open at both ends, a through peripheral space 3 is formed between the outer shell 1 and the inner cylinder 2, and the through connection here can be understood as the complete outer shell 1 and the complete inner cylinder 2 being restricted by smooth or non-smooth side walls, or can be understood as being restricted by different connecting sections of the outer shell 1 and different connecting sections of the inner cylinder 2 being restricted by smooth or non-smooth side walls, etc., all of which are within the protection scope of the present invention. An annular partition 4 is disposed in the peripheral space 3, which is used to divide the peripheral space 3 into an isolated first section 31 and a second section 32 in the length direction, wherein the partition 4 can be entirely located in the peripheral space 3, or can partially extend to the outside of the peripheral space 3, and a first through opening 31a connecting the inside and outside of the first section 31 and a second through opening 32a connecting the inside and outside of the second section 32 are disposed on both sides of the partition 4, respectively; see Figure 2 Through the arrangement of the outer shell 1, the inner cylinder 2 and the partition 4, a flow path can be formed between the first through-port 31a and the second through-port 32a. For example, the medium flows into the outer shell 1 from the second through-port 32a. After flowing in, the medium passes through the second section 32 and flows into the inner cylinder 2. After passing through the inner cylinder 2, the medium passes through the first section 31 and the first through-port 31a and flows out to the outside of the outer shell 1.

[0055] See also Figure 3 The combined heat exchanger further comprises at least one spiral coil 5, which is wound around the outer periphery of the inner cylinder 2 in the first section 31 and is connected to the outside of the shell 1 through pipelines at both ends of the first section 31; see Figure 4 The pipelines at both ends are respectively the first pipeline 51 at the bottom and the second pipeline 52 at the top. Through the setting of the spiral coil 5, a spiral flow path is formed. The spiral line diameter and pitch of the spiral coil 5 can be selected according to actual needs.

[0056] See also Figures 3 to 6 The combined heat exchanger further comprises a tube unit 6, which is arranged at one side of the inner cylinder 2 corresponding to the first section 31, and comprises a plurality of straight tube sections 61 parallel and arranged along the length direction of the outer shell 1, and a curved tube section 62 which connects the straight tube sections 61 in sequence to form a corrugated tube body. The length direction of the straight tube section 61 is perpendicular to the length direction of the outer shell 1, and both ends of the tube unit 6 are connected to the outside of the outer shell 1 through pipelines; Figure 4 and 5 As shown, the pipelines at both ends are the third pipeline 63 at the bottom and the fourth pipeline 64 at the top.

[0057] See also Figures 8-10The combined heat exchanger also includes a plurality of flow tubes 7 divided into two groups and open at both ends. The flow tubes 7 extend along the length direction of the outer shell 1. The extension here can be a straight extension along the length direction of the outer shell 1, or can produce appropriate bends. The first group is distributed in the second section 32, and the two ends of the first group are fixed by the first tube sheet 8 respectively. The two first tube sheets 8 separate the outer shell side 81 in the first section 31. The second group is distributed on the side of the inner cylinder 2 corresponding to the first section 31, and the two ends of the second group are fixed by the second tube sheet 10 respectively. The two second tube sheets 10 separate the inner shell side 101 in the inner cylinder 2. The outer shell side 81 and the inner shell side 101 are connected through the third through port 21 located on the inner cylinder 2. The inner shell side 101 and the outer shell side 81 are respectively connected to the outside of the outer shell 1 through pipelines on the side close to the partition 4. Fig. 9 and 10 As shown, the outer shell side 81 is connected to the outside through the fifth pipeline 81a, and the inner shell side 101 is connected to the outside through the sixth pipeline 101a.

[0058] In order to make the drawings clearer, dotted lines are used in the drawings to replace part of the circulation tube body 7. In the present application, the circulation tube body 7 is set up with both ends open to allow the medium in the flow path between the first through port 31a and the second through port 32a to flow, while the external outer shell side 81 and the inner shell side 101 can allow other media to flow to achieve heat exchange.

[0059] In the present invention, two heat exchange areas arranged in series can be formed in the partial flow path between the first through-port 31a and the second through-port 32a by setting the spiral coil 5 and the tube unit 6 at one end of the shell. The flow path in this part is used as a shell side, and the medium therein respectively exchanges heat with the medium in the tube unit 6 and the medium in the spiral coil 5. This partial structure can achieve the same technical effect as the shell and tube heat exchanger arranged in series. At the other end of the shell 1, two other heat exchange areas can be formed in the partial flow path between the first through-port 31a and the second through-port 32a by grouping a plurality of flow tube bodies 7. The flow path in this part is used as a tube side by setting the flow tube body 7. The two groups of tube sides are connected through the space formed by the head 11 and the shell 1. The medium therein respectively exchanges heat with the medium in the outer shell side 81 and the inner shell side 101. This part can achieve the same technical effect as the hairpin heat exchanger. With the overall connectivity of the flow path between the first through-port 31 a and the second through-port 32 a , the technical effect of connecting the hairpin heat exchanger and the shell and tube heat exchanger in series can be achieved.

[0060] In summary, the present invention integrates the original multiple devices to form an overall structure contained in the same housing 1. By reducing the number of devices, the relevant costs are greatly reduced, and the demand for installation sites can be effectively reduced. In the overall device structure, the flow of the medium is more compact, and while the heat exchange efficiency is improved, the problems of flow resistance and noise are effectively solved. The effective reduction of the pipe body connection points improves the processing and installation efficiency of the equipment on the one hand, and reduces the occurrence of problems during use on the other.

[0061] In the present invention, Fig.11 As shown, the inspection and maintenance of the equipment can be carried out more conveniently by removing the spiral coil 5 and the tube body unit 6; in the above-mentioned structural form, the first tube sheet 8 and the second tube sheet 10 can be fixedly connected to the outer shell 1 and the inner cylinder 2 by welding according to the installation method in the prior art, or can be connected by other sealed fixed connection methods. Since the connection area is large and the requirements for sealed connection are relatively strict, the connection is difficult or not suitable for too frequent disassembly; in contrast, each spiral coil 5 and each tube body unit 6 are respectively combined into relatively independent integral structures, and the connection position with the outer shell 1 and the inner cylinder 2 is only for connecting the pipeline outside the outer shell 1, so the difficulty of removing the equipment is relatively low.

[0062] Based on the above situation, no matter when inspecting and maintaining the spiral coil 5 and / or the tube body unit 6, or when inspecting and maintaining the tube sheet and the flow tube body 7, the spiral coil 5 and / or the tube body unit 6 can be removed first; in actual equipment, the size of the space for the two to be removed is often large enough for personnel to enter and check the inside of the equipment.

[0063] As a preferred embodiment of the above, at least two spiral coils 5 are provided, and the diameter of the spiral line gradually increases to form an inner and outer layer structure, and the ends of each layer structure are connected to the outside of the shell 1 through a common pipeline. Figure 3 , showing a structural form of setting up three layers of spiral coils 5, with parallel channels formed between each layer, which can independently participate in the heat exchange process through the entry of the medium. The first pipeline 51 and the second pipeline 52 in the figure are both used as common pipelines to summarize the medium flowing into or out of the spiral coils 5 in parallel.

[0064] In this preferred embodiment, the number of layers of the spiral coil 5 needs to be determined comprehensively based on the type of medium, heat exchange requirements, equipment size, and other factors in actual working conditions. Figure 5As shown, the spiral distribution method prolongs the time for the medium flowing into it to participate in heat exchange; when the external medium located in the first section 31 flows along the length direction of the shell 1, it forms a cross with the flow direction of the internal medium located in the spiral coil 5. This method can further improve the efficiency of heat exchange compared to the parallel flow method.

[0065] As a preferred embodiment of the above, the pitch of each layer of the spiral coil 5 is the same as the cross-sectional size of the tube body. This method is convenient for the selection and processing of raw materials, and can also make the media in the inner and outer layers of the first section 31 obtain a relatively stable heat exchange environment. Of course, this method of establishing a stable environment is more optimized, but it is not the only one. When the same technical purpose is achieved by synchronously adjusting the cross-sectional size of the tube body and the pitch, it is also within the protection scope of the present invention.

[0066] As a preferred embodiment of the above, at least two tube units 6 are provided, and the ends of each tube unit 6 are connected to the outside of the housing 1 through a common pipeline. Figure 4 and 5 The cross section shows the two tube units 6 included therein. Parallel channels are formed between the tube units 6, and the media can independently participate in the heat exchange process through the entry of the media. The third pipeline 63 and the fourth pipeline 64 in the figure are used as common pipelines to aggregate the media flowing into or out of the tube units 6 in parallel.

[0067] In this preferred embodiment, the number and length of the straight pipe sections 61 in the pipe unit 6 need to be determined comprehensively based on the type of medium, heat exchange requirements, equipment size, and other factors in actual working conditions. Figure 7 As shown, the corrugated distribution method prolongs the time for the medium flowing into it to participate in heat exchange; when the external medium located in the inner cylinder 2 flows along the length direction of the outer shell 1, it forms a cross with the flow direction of the internal medium located in the tube unit 6. This method can further improve the efficiency of heat exchange compared to the parallel flow method.

[0068] As a preferred embodiment of the above, see Figure 8 A zoomed-in view of the bottom, and Fig. 9 and Fig.10 The first tube sheet 8 and the second tube sheet 10 located at one end of the inner cylinder 2 are integrated, and the open end of one side of the inner cylinder 2 is blocked. This method can reduce the difficulty of processing and installing the tube sheet on the one hand, and effectively reduce the leakage probability of the inner shell 101 and the outer shell 81 on the other hand.

[0069] Based on the above scheme, as an optimization method of the third through opening 21, the third through opening 21 is located at the end of the inner cylinder 2, which is an area surrounded by a local indentation position of the end of the inner cylinder 2 and an integrated tube sheet, wherein the local indentation position of the end of the inner cylinder 2 can be understood as a notch structure with one end not closed, which is closed by the integrated tube sheet. Through this setting position of the third through opening 21, the medium can be circulated in the entire range in the inner shell 101 and the outer shell 81.

[0070] As a preferred embodiment of the above, the combined heat exchanger is used vertically, with the first section 31 located at the top and the second section 32 located at the bottom. This arrangement is beneficial to the heat exchange effect between the first section 31 and the corresponding part of the inner cylinder 2. In the present invention, the arrangement of the spiral coil 5 and the tube unit 6 restricts the flow path of the internal medium. The vertical arrangement allows the medium in this part of the shell to flow vertically everywhere, and can maintain a stable intersection angle with the medium in the tube, so that the heat exchange at each location is uniform and stable. Fig.12 As shown, the flow direction of this part of the shell-side medium does not change when it flows through the flow tubes 7 at the bottom or comes from the flow tubes 7 at the bottom, which can effectively reduce the flow resistance and ensure the stability of the internal medium flow.

[0071] As a preferred embodiment of the above, Fig.13 As shown, the cross-section of the partition 4 is arched and protrudes toward the bottom to form a receiving groove, so that cold air can be used for heat exchange in the first section 31, and when condensed water is generated, the condensed water is collected to avoid corrosion of the weld at the edge of the groove; when a liquid level sensor and a drainage pipe connected to the outside are arranged in the groove, a correlation between the drainage power and the liquid level height can be established, so that the condensed water reaching a certain height in the groove can be discharged promptly and effectively.

[0072] In order to further improve the heat exchange efficiency of the flow pipe 7, Fig.14 and 15 As shown, as a preferred embodiment of the above embodiment, a plurality of guide plates are arranged in parallel and at intervals in the inner shell 101 and / or the outer shell 81; two adjacent guide plates are staggered to limit the flow path of the medium to a wave shape.

[0073] The figure shows that both the inner shell side 101 and the outer shell side 81 are provided with flow guide plates, wherein the flow guide plate located in the inner shell side 101 is the second flow guide plate 101b, and the flow guide plate located in the outer shell side 81 is the first flow guide plate 81b. When the flow path of the medium flowing in the tube side portion of the flow tube body 7 is determined, the wave shape formed by the medium located in the shell side under the restriction of the flow guide plate can effectively extend the circulation time in the shell side, that is, extend the heat exchange time. In addition, this restriction method changes the parallel circulation mode of the shell side and tube side media here, and the shell side medium will collide with the flow tube body 7 due to the formation of the cross angle during the circulation process, thereby improving the effect of heat exchange.

[0074] Embodiment 2

[0075] The working method of the combined heat exchanger as described in the first embodiment simultaneously executes the medium flow in the following paths;

[0076] The first medium is introduced into the path connecting the second section 32, the interior of the inner cylinder 2 and the first section 31. The first medium flows in from the second through-hole 32a and flows out from the first through-hole 31a, and passes through each flow tube 7 in the inner cylinder 2 and the second section 32.

[0077] A second medium is introduced into the path connected by the inner shell side 101, the third through-hole 21 and the outer shell side 81. The second medium enters from the inner shell side 101 and flows out from the outer shell side 81.

[0078] A third medium is introduced into the path inside the spiral coil 5. The third medium enters from the end close to the partition 4 and flows out from the end close to the head 11.

[0079] A fourth medium is introduced into the path inside the tube unit 6 , and the fourth medium flows in from an end close to the end cap 11 and flows out from an end close to the partition plate 4 ;

[0080] The first medium performs heat exchange with the second medium, the third medium and the fourth medium respectively, wherein the second medium, the third medium and the fourth medium are different from each other, or at least two of them are the same.

[0081] In this embodiment, continuous heat exchange can be achieved by continuously and stably circulating the medium in each path. By limiting the inflow and outflow directions of the medium, any two media for heat exchange can flow in opposite directions, thereby ensuring the effect of heat exchange. The selection of the four media can be made according to actual production needs. The combined heat exchanger in the present invention has high versatility. Taking high-temperature air as the first medium as an example, when cold lava is selected as the second medium and cooling water is selected as the third medium and the fourth medium respectively, the incoming high-temperature air can be cooled and output, and the corresponding cold lava and cooling water will be output after the temperature is increased.

[0082] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A combined heat exchanger, characterized in that: include: An outer shell sealed at both ends by end caps, and an inner cylinder disposed in the outer shell and open at both ends, a through peripheral space formed between the outer shell and the inner cylinder, an annular partition disposed in the peripheral space for dividing the peripheral space into an isolated first section and a second section in the length direction, and a first through opening connecting the inside and outside of the first section and a second through opening connecting the inside and outside of the second section are disposed on both sides of the partition respectively; At least one spiral coil, coiled around the outer periphery of the inner cylinder in the first section, and connected to the outside of the outer shell through pipelines at both ends of the first section; a tube unit, arranged at one side of the inner cylinder corresponding to the first section, comprising a plurality of straight tube sections parallel and juxtaposed along the length direction of the outer shell, and a curved tube section of a corrugated tube body formed by sequentially connecting the straight tube sections, wherein the length direction of the straight tube section is perpendicular to the length direction of the outer shell, and both ends of the tube unit are connected to the outside of the outer shell through pipelines; A plurality of flow tubes are divided into two groups and open at both ends, the flow tubes extend along the length direction of the outer shell, the first group is distributed in the second section, the two ends of the first group are fixed by first tube sheets respectively, and the two first tube sheets separate an outer shell side in the first section, the second group is distributed on a side of the inner cylinder corresponding to the first section, the two ends of the second group are fixed by second tube sheets respectively, and the two second tube sheets separate an inner shell side in the inner cylinder, the outer shell side and the inner shell side are connected through a third through port located on the inner cylinder, and the inner shell side and the outer shell side are respectively connected to the outside of the outer shell through pipelines on the side close to the partition.

2. The combined heat exchanger according to claim 1, characterized in that: At least two spiral coils are provided, and the diameter of the spiral line gradually increases to form an inner and outer layered structure, and the ends of each layered structure are connected to the outside of the shell through a common pipeline.

3. The combined heat exchanger according to claim 2, characterized in that: The pitch of the spiral coil and the cross-sectional dimensions of the tube body are the same in each layer.

4. The combined heat exchanger according to claim 1, characterized in that: At least two tube units are provided, and the end of each tube unit is communicated with the outside of the shell through a common pipeline.

5. The combined heat exchanger according to claim 1, characterized in that: The first tube sheet and the second tube sheet located at one side of the end of the inner cylinder are integrally arranged, and one open end of the inner cylinder is sealed.

6. The combined heat exchanger according to claim 5, characterized in that: The third through opening is located at the end of the inner cylinder, which is an area surrounded by a local retracted position of the end of the inner cylinder and an integrated tube sheet.

7. The combined heat exchanger according to claim 1, characterized in that: The combined heat exchanger is used vertically, with the first section located at the top and the second section located at the bottom.

8. The combined heat exchanger according to claim 7, characterized in that: The partition has an arched cross section and protrudes toward the bottom to form a receiving groove.

9. The combined heat exchanger according to claim 1, characterized in that: A plurality of guide plates are arranged in parallel and at intervals in the inner shell and / or the outer shell; Two adjacent guide plates are staggered to limit the flow path of the medium to a wave shape.

10. The operating method of the combined heat exchanger according to claim 1, characterized in that: Synchronously execute the medium flow in the following paths; A first medium is introduced into the path connecting the second section, the interior of the inner cylinder and the first section, the first medium flows in from the second through-hole, flows out from the first through-hole, and passes through each of the flow tubes in the inner cylinder and the second section; A second medium is introduced into the path connected by the inner shell side, the third through-hole and the outer shell side, wherein the second medium enters from the inner shell side and flows out from the outer shell side; A third medium is introduced into the path inside the spiral coil, the third medium enters from an end close to the partition plate and flows out from an end close to the end cap; A fourth medium is introduced into the path inside the tube unit, the fourth medium flows in from an end close to the end cap and flows out from an end close to the partition plate; The first medium performs heat exchange with the second medium, the third medium and the fourth medium respectively, wherein the second medium, the third medium and the fourth medium are different from each other, or at least two of them are the same.

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