Combined gas-liquid heat exchanger

Abstract

The invention provides a combined gas-liquid heat exchanger which comprises a shell and a lower shell, a gas outlet of the shell is connected with the lower shell, a first heat exchange cavity and a second heat exchange cavity are formed in the shell and sequentially communicated in the flowing direction of a shell pass heat exchange medium, a first heat exchange plate set is arranged in the first heat exchange cavity, and a second heat exchange plate set is arranged in the second heat exchange cavity. A second heat exchange plate group and a heat exchange tube group are sequentially arranged in the second heat exchange chamber; the first heat exchange plate set, the second heat exchange plate set and the heat exchange tube set are each provided with a heat exchange channel, and a tube pass heat exchange medium can enter the heat exchange channels to exchange heat with a shell pass heat exchange medium. In the flowing direction of the tube pass heat exchange medium, the heat exchange channels of the second heat exchange plate set are sequentially communicated with the heat exchange channels of the first heat exchange plate set, and the heat exchange channels of the heat exchange tube set are sequentially communicated with the heat exchange channels of the first heat exchange plate set. The heat exchanger is low in equipment cost, small in occupied space and high in heat exchange efficiency, and the comprehensive cost of the heat exchanger can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to a combined gas-liquid heat exchanger. Background Art

[0002] According to the survey, the total waste heat resources of various industries account for 17%-67% of their total fuel consumption, and the recyclable waste heat resources account for about 60% of the total waste heat resources. At present, many mechanical equipment will generate a large amount of waste gas (smoke) during the working process.

[0003] In the prior art, when recovering waste heat from exhaust gas, a gas-liquid heat exchanger is often used. However, conventional gas-liquid heat exchangers often have problems such as low heat exchange efficiency, large space occupied by the whole machine, and high cost, which is not conducive to reducing the comprehensive industrial cost of the heat exchanger. Summary of the invention

[0004] In view of this, the present invention aims to propose a combined gas-liquid heat exchanger to solve the problems of low heat exchange efficiency, large space occupied by the whole machine and high cost in the gas-liquid heat exchanger in the prior art.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A combined gas-liquid heat exchanger comprises a shell and a lower shell, wherein the gas outlet of the shell is connected to the lower shell, a first heat exchange chamber and a second heat exchange chamber are arranged in the shell, and along the flow direction of the shell-side heat exchange medium, the first heat exchange chamber and the second heat exchange chamber are sequentially connected, a first heat exchange plate group is arranged in the first heat exchange chamber, and a second heat exchange plate group and a heat exchange tube group are sequentially arranged in the second heat exchange chamber; the first heat exchange plate group, the second heat exchange plate group and the heat exchange tube group all have heat exchange channels, and the tube-side heat exchange medium can enter the heat exchange channels to exchange heat with the shell-side heat exchange medium; along the flow direction of the tube-side heat exchange medium, the heat exchange channel of the second heat exchange plate group is sequentially connected with the heat exchange channel of the first heat exchange plate group, and the heat exchange channel of the heat exchange tube group is sequentially connected with the heat exchange channel of the first heat exchange plate group.

[0007] Furthermore, the first heat exchange plate group and the second heat exchange plate group both include heat exchange plates. For any one of the heat exchange plates, a medium flow channel is arranged in the plate body of the heat exchange plate, and a manifold is arranged at both ends of the plate body, and the manifold is connected to the medium flow channel; the heat exchange tube group includes heat exchange tubes.

[0008] Furthermore, in the up-down direction, any two adjacent heat exchange plates are stacked; in the front-to-back direction, a gas flow channel is formed between any heat exchange plate and the front-to-back adjacent heat exchange plates.

[0009] Furthermore, in the front-to-back direction, a support member is arranged between any two adjacent heat exchange plates.

[0010] Furthermore, the combined gas-liquid heat exchanger includes a first liquid inlet pipe box, a first liquid outlet pipe box, a second liquid inlet pipe box, and a second liquid outlet pipe box. The liquid inlet of the second heat exchange plate group and the liquid inlet of the heat exchange tube group are both connected to the first liquid inlet pipe box, the liquid outlet of the second heat exchange plate group and the liquid outlet of the heat exchange tube group are both connected to the first liquid outlet pipe box, the first liquid outlet pipe box is connected to the second liquid inlet pipe box, the liquid inlet of the first heat exchange plate group is connected to the second liquid inlet pipe box, and the liquid outlet of the first heat exchange plate group is connected to the second liquid outlet pipe box.

[0011] Furthermore, the combined gas-liquid heat exchanger includes a connecting pipe, and the first liquid outlet of the first liquid outlet pipe box is connected to the second liquid inlet of the second liquid inlet pipe box through the connecting pipe.

[0012] Furthermore, the first liquid inlet pipe box, the first liquid outlet pipe box, the second liquid inlet pipe box, and the second liquid outlet pipe box are all connected to the shell, and tube sheets are provided between the first liquid inlet pipe box, the first liquid outlet pipe box, the second liquid inlet pipe box, and the second liquid outlet pipe box and the shell respectively, and the manifolds of the heat exchange tubes and the heat exchange plates can all pass through the tube sheets.

[0013] Furthermore, the first heat exchange plate group and the second heat exchange plate group are both non-condensing sections, and the heat exchange tube group is a condensing section.

[0014] Furthermore, an air outlet pipe is arranged on the side wall of the lower shell, a liquid discharge pipe is arranged on the bottom of the lower shell, and a water baffle is arranged inside the lower shell, and the water baffle is located at the inlet of the air outlet pipe.

[0015] Compared with the prior art, the combined gas-liquid heat exchanger described in the present invention has the following advantages:

[0016] The combined gas-liquid heat exchanger described in the present invention is provided with two heat exchange chambers and corresponding heat exchange groups, so that the shell-side heat exchange medium flows through the first heat exchange plate group, the second heat exchange plate group, and the heat exchange tube group in sequence for heat exchange, thereby utilizing the combination of the heat exchange plate group and the heat exchange tube group, which is beneficial to reducing the cost of the heat exchanger as much as possible on the one hand, and ensuring the heat exchange efficiency on the other hand. At the same time, the combined gas-liquid heat exchanger occupies a small space as a whole; in terms of the comprehensive cost combining indicators such as equipment cost and heat exchange efficiency, the comprehensive cost of the combined gas-liquid heat exchanger of the present application is much lower than the comprehensive cost of conventional plate heat exchangers and tube heat exchangers.

[0017] In addition, the present application makes a specific combination and layout of the heat exchange plate group and the heat exchange tube group so that the gas can be heat exchanged step by step, which is beneficial to ensuring the overall heat exchange efficiency of the heat exchanger, and the gas is concentrated at the most downstream heat exchange tube group to produce condensation. On the one hand, the condensed water is easy to drip along the tube body, which is convenient for the collection and discharge of the condensed water. On the other hand, in the actual production and process calculation of the combined gas-liquid heat exchanger, the heat exchange plate group with lower thermal conductivity is set in the non-condensing section, and the heat exchange tube with higher thermal conductivity is set in the condensing section, which can significantly reduce the overall cost of the entire heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 This is a structural schematic diagram of a combined gas-liquid heat exchanger according to an embodiment of the present invention;

[0020] Figure 2 For the embodiment of the present invention Figure 1 The schematic diagram of the structure after removing the heat exchange plate group, heat exchange tube group and connecting pipe;

[0021] Figure 3 A side view of a combined gas-liquid heat exchanger according to an embodiment of the present invention;

[0022] Figure 4 For the embodiment of the present invention Figure 1 A partial enlarged view of the middle A;

[0023] Figure 5 For the embodiment of the present invention Figure 1 Schematic diagram of the cross section in the BB direction (tube sheet omitted);

[0024] Figure 6 For the embodiment of the present invention Figure 5 A partial enlarged view of point C in the middle;

[0025] Figure 7 For the embodiment of the present invention Figure 5 A partial enlarged view of point D in the middle;

[0026] Figure 8 A simplified structural diagram of any two adjacent heat exchange plates in a combined gas-liquid heat exchanger according to an embodiment of the present invention;

[0027] Fig. 9 It is a front view of any one heat exchange plate in a combined gas-liquid heat exchanger according to an embodiment of the present invention;

[0028] Fig.10For the embodiment of the present invention Fig. 9 Side view on the foundation;

[0029] Fig.11 For the embodiment of the present invention Fig. 9 Schematic diagram of the cross section along the EE direction;

[0030] Fig.12 Another structural schematic diagram of a combined gas-liquid heat exchanger described in an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Shell; 11. Air inlet; 12. Air outlet; 13. First heat exchange chamber; 14. Connecting chamber; 15. Second heat exchange chamber; 16. Gas flow channel; 2. First liquid inlet pipe box; 21. First liquid inlet; 3. First liquid outlet pipe box; 31. First liquid outlet; 4. Second liquid inlet pipe box; 41. Second liquid inlet; 5. Second liquid outlet pipe box; 51. Second liquid outlet; 6. Tube sheet; 7. Connecting pipe; 8. Heat exchange plate group; 81. Heat exchange plate; 811. Plate body; 812. Medium flow channel; 814. Manifold; 82. Support member; 9. Heat exchange tube group; 91. Heat exchange tube; 92. Support plate; 10. Lower shell; 101. Air outlet pipe; 102. Water retaining plate; 103. Drain pipe. DETAILED DESCRIPTION

[0033] The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the essence of their work to other persons skilled in the art. However, these inventive concepts can be embodied in many different forms and should not be considered limited to the embodiments described herein.

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. Figure 1 , 5 , the coordinates in 12.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0036] Example 1

[0037] In order to solve the problems of low heat exchange efficiency, large space occupied by the whole machine and high cost in the prior art gas-liquid heat exchanger, this embodiment proposes a combined gas-liquid heat exchanger, as shown in the attached Figure 1-11As shown, the combined gas-liquid heat exchanger includes a shell 1, in which a first heat exchange chamber 13 and a second heat exchange chamber 15 are arranged. In the flow direction of the shell-side heat exchange medium, the first heat exchange chamber 13 and the second heat exchange chamber 15 are sequentially connected, and at least one group of first heat exchange plate groups are arranged in the first heat exchange chamber 13, and a second heat exchange plate group and a heat exchange tube group 9 are sequentially arranged in the second heat exchange chamber 15, that is, the second heat exchange plate group is located upstream of the heat exchange tube group 9; the first heat exchange plate group, the second heat exchange plate group, and the heat exchange tube group 9 all have heat exchange channels, and the tube-side heat exchange medium can enter the heat exchange channels to exchange heat with the shell-side heat exchange medium; in the flow direction of the tube-side heat exchange medium, the heat exchange channels of the second heat exchange plate group are sequentially connected with the heat exchange channels of the first heat exchange plate group, and the heat exchange channels of the heat exchange tube group 9 are sequentially connected with the heat exchange channels of the first heat exchange plate group.

[0038] Under non-condensing conditions, thermal conductivity often has little effect on the heat exchange area, and heat exchange plates have more advantages. The area of ​​heat exchange plates is 15%-25% larger than that of heat exchange tubes. The heat exchange wall of heat exchange plates is thin, and the material cost is low, so the overall cost of heat exchange plates is low. Under condensing conditions, heat exchange tubes with high thermal conductivity have obvious advantages. Compared with heat exchange plates with low thermal conductivity, the heat exchange area is smaller and the overall cost of heat exchange tubes is low.

[0039] The present application sets two heat exchange chambers and corresponding heat exchange groups, so that the shell-side heat exchange medium flows through the first heat exchange plate group, the second heat exchange plate group, and the heat exchange tube group 9 in sequence for heat exchange, thereby utilizing the combination of the heat exchange plate group and the heat exchange tube group. On the one hand, it is beneficial to reduce the cost of the heat exchanger as much as possible, and on the other hand, it ensures the heat exchange efficiency. At the same time, the combined gas-liquid heat exchanger occupies a small space as a whole. In terms of the comprehensive cost combining indicators such as equipment cost and heat exchange efficiency, the comprehensive cost of the combined gas-liquid heat exchanger of the present application is much lower than the comprehensive cost of conventional plate heat exchangers and tube heat exchangers.

[0040] The shell 1 has an air inlet 11 and an air outlet 12, wherein the air inlet 11 is the gas inlet of the first heat exchange chamber 13, and the air outlet 12 is the gas outlet of the second heat exchange chamber 15. The shell side heat exchange medium is preferably a gaseous medium, such as high-temperature exhaust gas; and the tube side heat exchange medium is preferably a liquid medium, such as normal temperature water.

[0041] The first heat exchange plate group and the second heat exchange plate group can be regarded as the heat exchange plate group 8 in the attached drawings. For the convenience of description, they are distinguished as the first heat exchange plate group and the second heat exchange plate group. The first heat exchange plate group and the second heat exchange plate group both include heat exchange plates 81. For any heat exchange plate 81, a medium flow channel 812 is set in the plate body 811 of the heat exchange plate 81. Both ends of the plate body 811 are provided with a manifold 814, and the manifold 814 is connected to the medium flow channel 812, so that the liquid can flow along the medium flow channel 812 for heat exchange. Figure 1 , 5 From two perspectives, the first heat exchange plate group is composed of a plurality of heat exchange plates, including heat exchange plates arranged transversely (which can be understood as the horizontal direction) and longitudinally (which can be understood as the up and down direction); the second heat exchange plate group is also the same and will not be described in detail.

[0042] In the same heat exchange chamber, any two adjacent heat exchange plates 81 are stacked in the up-down direction; in the front-to-back direction, a gas flow channel 16 is formed between any heat exchange plate 81 and the heat exchange plates 81 adjacent to each other in the front and back directions. Therefore, when the gas flows through the first heat exchange plate group and the second heat exchange plate group, it can flow through the surface of the heat exchange plate 81 along the gas flow channel 16 for heat exchange. Preferably, a support member 82 is provided between any two adjacent heat exchange plates 81 in the front-to-back direction to ensure the assembly stability of the heat exchange plate group 8, avoid displacement or rotation of the heat exchange plate 81, and help ensure the normal operation of the heat exchanger.

[0043] The heat exchange tube group 9 includes a support plate 92 and a plurality of heat exchange tubes 91. Any heat exchange tube 91 passes through the support plate 92, and the support plate 92 provides support for the relatively long and slender heat exchange tube 91. Figure 1 , 5 From two perspectives, the heat exchange tube group 9 is composed of a plurality of heat exchange tubes, including heat exchange tubes arranged transversely (which can be understood as the horizontal direction) and longitudinally (which can be understood as the up and down direction).

[0044] The combined gas-liquid heat exchanger includes a plurality of pipe box structures, which are respectively denoted as the first liquid inlet pipe box 2, the first liquid outlet pipe box 3, the second liquid inlet pipe box 4, and the second liquid outlet pipe box 5. The liquid inlet of the second heat exchange plate group and the liquid inlet of the heat exchange tube group 9 are both connected to the first liquid inlet pipe box 2, the liquid outlet of the second heat exchange plate group and the liquid outlet of the heat exchange tube group 9 are both connected to the first liquid outlet pipe box 3, the first liquid outlet pipe box 3 is connected to the second liquid inlet pipe box 4, the liquid inlet of the first heat exchange plate group is connected to the second liquid inlet pipe box 4, and the liquid outlet of the first heat exchange plate group is connected to the second liquid outlet pipe box 5. Thus, the liquid medium flows into the second heat exchange plate group or the heat exchange tube group 9 through the first liquid inlet pipe box 2 for the first stage of heat exchange, and then flows through the first liquid outlet pipe box 3 and the second liquid inlet pipe box 4 in sequence, flows into the first heat exchange plate group for the second stage of heat exchange, and finally flows out from the second liquid outlet pipe box 5.

[0045] Specifically, the first liquid inlet pipe box 2 is provided with a first liquid inlet 21, the first liquid outlet pipe box 3 is provided with a first liquid outlet 31, the second liquid inlet pipe box 4 is provided with a second liquid inlet 41, and the second liquid outlet pipe box 5 is provided with a second liquid outlet 51. Preferably, the combined gas-liquid heat exchanger includes a connecting pipe 7, and the first liquid outlet 31 of the first liquid outlet pipe box 3 is connected to the second liquid inlet 41 of the second liquid inlet pipe box 4 through the connecting pipe 7.

[0046] The first liquid inlet pipe box 2, the first liquid outlet pipe box 3, the second liquid inlet pipe box 4, and the second liquid outlet pipe box 5 are all connected to the shell 1, and corresponding tube sheets 6 are respectively arranged between the first liquid inlet pipe box 2, the first liquid outlet pipe box 3, the second liquid inlet pipe box 4, and the second liquid outlet pipe box 5 and the shell 1, and the heat exchange tubes 91 and the manifolds 814 of the heat exchange plates 81 can all penetrate the tube sheets 6, so that each heat exchange plate 81 and heat exchange tube 91 can be connected to the corresponding tube box structure, and the installation and fixation of the heat exchange plate 81, heat exchange tube 91, tube box structure and other components are also ensured. At the same time, since the two ends of the heat exchange plate 81 of the present application are set in the form of tubes, the heat exchange plate 81 maintains the plate structure and the plate heat exchange form, and performs the tube assembly form, which can be assembled with the tube sheet 6 more simply, and can take advantage of the low cost advantage of the heat exchange plate, reduce the cost of the heat exchange components, reduce the assembly difficulty of the heat exchange plate, and improve the assembly efficiency.

[0047] The shell 1 includes a connecting chamber 14, one side of the connecting chamber 14 is connected to the first heat exchange chamber 13, and the other side is connected to the second heat exchange chamber 15, so that the gas can flow through the first heat exchange chamber 13, the connecting chamber 14, and the second heat exchange chamber 15 in sequence, and exchange heat with the multi-stage heat exchange plates 81 in sequence, and then exchange heat with the heat exchange tube 91.

[0048] In the present application, the heat exchange plate 81 and the heat exchange tube 91 are preferably made of engineering plastics. In the thickness direction of the heat exchange wall, the thermal conductivity of the heat exchange plate 81 is 1W / (m·K), and the thermal conductivity of the heat exchange tube 91 is 2W / (m·K)-7W / (m·K). Accordingly, when the gas and liquid flow through the heat exchange plate 81 for heat exchange, the gas temperature is relatively high, and the heat exchange efficiency of the heat exchange plate 81 is not high, so that the heat exchange plate group 8 is a non-condensing section (specifically, the first heat exchange plate group and the second heat exchange plate group are both non-condensing sections). Then, when the gas and liquid flow through the heat exchange tube 91 for heat exchange, the gas temperature is relatively low, and the heat exchange efficiency of the heat exchange tube 91 is relatively high. The water vapor in the gas condenses at the heat exchange tube 91, so that the heat exchange tube group 9 is a condensing section. This allows the present application to perform step-by-step heat exchange by specifically combining and arranging the heat exchange plate group 8 and the heat exchange tube group 9, which is beneficial to ensuring the overall heat exchange efficiency of the heat exchanger, and the gas is concentrated at the most downstream heat exchange tube group 9 to produce condensation. On the one hand, the condensed water is easy to drip along the tube body, which facilitates the collection and discharge of the condensed water. On the other hand, in the actual production and process calculation of the combined gas-liquid heat exchanger, the heat exchange plate group with a lower thermal conductivity is set in the non-condensing section, and the heat exchange tube with a higher thermal conductivity is set in the condensing section, which can significantly reduce the overall cost of the entire heat exchanger.

[0049] Example 2

[0050] As attached Fig.12 As shown, in this embodiment, based on all the contents of embodiment 1, the combined gas-liquid heat exchanger further includes a lower shell 10, the gas outlet 12 of the shell 1 is connected to the lower shell 10, and the gas enters the lower shell 10 after heat exchange, and an outlet pipe 101 is arranged on the side wall of the lower shell 10, so that the gas after heat exchange flows out to the downstream equipment, and a drain pipe 103 is arranged at the bottom of the lower shell 10, so that the condensed water generated in the condensation section falls into the lower shell 10, and is collected at the bottom of the lower shell 10 and discharged through the drain pipe 103.

[0051] A water baffle 102 is disposed inside the lower shell 10. The water baffle 102 is located at the entrance of the outlet pipe 101 and is used to filter and deflect the gas flowing to the outlet pipe 101. On the one hand, it appropriately reduces the speed of the gas, and on the other hand, it prevents the gas from carrying water mist or other debris into downstream equipment.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined gas-liquid heat exchanger, characterized in that: The combined gas-liquid heat exchanger comprises a shell (1) and a lower shell (10); the gas outlet (12) of the shell (1) is connected to the lower shell (10); a first heat exchange chamber (13) and a second heat exchange chamber (15) are arranged in the shell (1); along the flow direction of the shell-side heat exchange medium, the first heat exchange chamber (13) and the second heat exchange chamber (15) are sequentially connected; a first heat exchange plate group is arranged in the first heat exchange chamber (13); and a second heat exchange plate group and a heat exchange tube group (9) are sequentially arranged in the second heat exchange chamber (15); the first heat exchange plate group, the second heat exchange plate group and the heat exchange tube group (9) all have heat exchange channels, and the tube-side heat exchange medium can enter the heat exchange channels to exchange heat with the shell-side heat exchange medium; along the flow direction of the tube-side heat exchange medium, the heat exchange channel of the second heat exchange plate group is sequentially connected to the heat exchange channel of the first heat exchange plate group, and the heat exchange channel of the heat exchange tube group (9) is sequentially connected to the heat exchange channel of the first heat exchange plate group.

2. A combined gas-liquid heat exchanger according to claim 1, characterized in that: The first heat exchange plate group and the second heat exchange plate group both comprise heat exchange plates (81); for any one of the heat exchange plates (81), a medium flow channel (812) is provided in the plate body (811) of the heat exchange plate (81); manifolds (814) are provided at both ends of the plate body (811); the manifolds (814) are connected to the medium flow channel (812); and the heat exchange tube group (9) comprises heat exchange tubes (91).

3. A combined gas-liquid heat exchanger according to claim 2, characterized in that: In the up-down direction, any two adjacent heat exchange plates (81) are stacked; in the front-to-back direction, a gas flow channel (16) is formed between any heat exchange plate (81) and the heat exchange plates (81) adjacent to it in the front-to-back direction.

4. The combined gas-liquid heat exchanger according to claim 2, characterized in that: In the front-to-back direction, a support member (82) is provided between any two adjacent heat exchange plates (81).

5. The combined gas-liquid heat exchanger according to claim 2, characterized in that: The combined gas-liquid heat exchanger comprises a first liquid inlet pipe box (2), a first liquid outlet pipe box (3), a second liquid inlet pipe box (4), and a second liquid outlet pipe box (5); the liquid inlet of the second heat exchange plate group and the liquid inlet of the heat exchange tube group (9) are both connected to the first liquid inlet pipe box (2); the liquid outlet of the second heat exchange plate group and the liquid outlet of the heat exchange tube group (9) are both connected to the first liquid outlet pipe box (3); the first liquid outlet pipe box (3) is connected to the second liquid inlet pipe box (4); the liquid inlet of the first heat exchange plate group is connected to the second liquid inlet pipe box (4); and the liquid outlet of the first heat exchange plate group is connected to the second liquid outlet pipe box (5).

6. A combined gas-liquid heat exchanger according to claim 5, characterized in that: The combined gas-liquid heat exchanger comprises a connecting pipe (7), and the first liquid outlet (31) of the first liquid outlet pipe box (3) is connected to the second liquid inlet (41) of the second liquid inlet pipe box (4) through the connecting pipe (7).

7. The combined gas-liquid heat exchanger according to claim 5, characterized in that: The first liquid inlet pipe box (2), the first liquid outlet pipe box (3), the second liquid inlet pipe box (4), and the second liquid outlet pipe box (5) are all connected to the shell (1), and tube sheets (6) are provided between the first liquid inlet pipe box (2), the first liquid outlet pipe box (3), the second liquid inlet pipe box (4), and the second liquid outlet pipe box (5) and the shell (1), respectively, and the heat exchange tubes (91) and the manifolds (814) of the heat exchange plates (81) are all capable of penetrating the tube sheets (6).

8. The combined gas-liquid heat exchanger according to claim 1, characterized in that: The first heat exchange plate group and the second heat exchange plate group are both non-condensing sections, and the heat exchange tube group (9) is a condensing section.

9. The combined gas-liquid heat exchanger according to claim 1, characterized in that: An air outlet pipe (101) is arranged on the side wall of the lower shell (10), a liquid discharge pipe (103) is arranged on the bottom of the lower shell (10), and a water baffle (102) is arranged inside the lower shell (10), and the water baffle (102) is located at the entrance of the air outlet pipe (101).

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