CN213778721U - Floating head heat exchanger - Google Patents
Floating head heat exchanger Download PDFInfo
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- CN213778721U CN213778721U CN202022511900.6U CN202022511900U CN213778721U CN 213778721 U CN213778721 U CN 213778721U CN 202022511900 U CN202022511900 U CN 202022511900U CN 213778721 U CN213778721 U CN 213778721U
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Abstract
The utility model relates to a floating head heat exchanger, this floating head heat exchanger include casing, pipe case, fixed tube sheet, heat exchanger tube bank, unsteady tube sheet and floating head lid, floating head heat exchanger still includes fixed pipe box and output sleeve, the one end fixed connection of fixed pipe box in the fixed tube sheet and with second chamber intercommunication, the other end fixed connection in the floating tube sheet and with the floating head chamber intercommunication, output sleeve gappedly can remove to insert in the pipe case with fixed pipe box to have expose in the outer tip in the pipe case outside, output sleeve includes outer tube and the inner tube that is connected, the outer tube is coaxial and the gappedly cover is established on the inner tube. Through above-mentioned technical scheme, the floating head heat exchanger that this disclosure provided simple structure, heat exchange efficiency height just can eliminate the peripheral difference in temperature stress of tube sheet and equipment flange.
Description
Technical Field
The disclosure relates to the technical field of heat exchangers, in particular to a floating head type heat exchanger.
Background
The floating head type heat exchanger is one of shell-and-tube heat exchangers, wherein a tube plate at one end of the floating head type heat exchanger is fixed between a shell and a tube box, and a tube plate at the other end of the floating head type heat exchanger can freely move in the shell. Because the thermal expansion of the tube bundle is not restricted by the shell, the floating head heat exchanger can not generate large temperature difference thermal stress, thereby avoiding the damage to the structure of the heat exchanger. In addition, the floating head heat exchanger is convenient to disassemble and clean, so that the floating head heat exchanger is widely applied to occasions where the temperature difference between the shell and the tube bundle is large or the shell side medium is easy to scale.
In the related art, a manifold partition is generally provided in the header so that the fluid can make a round trip multiple times in the heat exchange tube bundle, that is, so-called a multi-pass heat exchanger. The floating head type heat exchanger is widely applied to a two-tube-pass or multi-tube-pass heat exchanger, when the temperature difference between a tube-pass medium and a shell-pass medium is large, a pass partition plate, tube plates and an equipment flange on two sides of the pass partition plate are easy to deform, and further sealing failure at the pass partition plate and the equipment flange and cracking of a connecting welding seam of the tube plates and a heat exchange tube are caused, and even a tube-pass tube box is leaked.
SUMMERY OF THE UTILITY MODEL
The floating head type heat exchanger is simple in structure, high in heat exchange efficiency and capable of eliminating temperature difference stress on the peripheries of a tube plate and an equipment flange.
In order to achieve the above object, the present disclosure provides a floating head heat exchanger including a shell configured in a tubular shape with one end sealed and the other end open, a fixed tube plate serving as a first chamber, a tube bundle disposed in the first chamber and defining a floating head chamber together with the floating head cover, a floating tube plate hermetically connected to the tube box to define a second chamber and hermetically connected to the opening of the shell, a floating tube plate disposed in the first chamber and arranged in an axial direction of the shell and having first and second ends axially opposite to each other, the first end fixedly connected to the floating tube plate disposed in the first chamber and communicating with the floating head chamber, the second end fixedly connected to the fixed tube plate and communicating with the second chamber, the floating head type heat exchanger further comprises a fixed pipe sleeve and an output sleeve, one end of the fixed pipe sleeve is fixedly connected to the fixed pipe plate and communicated with the second chamber, the other end of the fixed pipe sleeve is fixedly connected to the floating pipe plate and communicated with the floating head chamber, the output sleeve is movably inserted into the pipe box and the fixed pipe sleeve in a clearance mode and is provided with an outer end portion exposed outside the pipe box, the output sleeve comprises an outer pipe and an inner pipe which are connected, and the outer pipe is coaxially sleeved on the inner pipe in a clearance mode.
Optionally, the output casing includes an insulating layer disposed in a gap between the outer tube and the inner tube.
Optionally, the insulation layer is located in the second chamber.
Optionally, the output sleeve is arranged coaxially with the housing.
Optionally, a distance post is disposed in a gap between the outer tube and the fixed socket, the distance post configured to allow axial movement of the outer tube relative to the fixed socket and to limit radial movement of the outer tube relative to the fixed socket.
Optionally, the number of the distance posts is multiple, and the distance posts are arranged at intervals in the axial direction and the circumferential direction of the heat exchange tube bundle.
Optionally, the tube box is connected with a tube side inlet of the second chamber, and the outer end part is connected with a tube side outlet, so that a tube side medium flows to the tube side outlet and flows out of the tube side outlet sequentially through the tube side inlet, the second chamber, the heat exchange tube bundle, the floating head chamber and the output sleeve.
Optionally, the output sleeve is integrally formed with the tube side outlet and is mounted to the outside of the tube box by a flange and a sealing gasket.
Optionally, a sealing flange is connected to the outer end portion, a flange is connected to the tube side outlet, the flange is connected to the tube box by a fastener, and the sealing flange is compressed between the flange and the tube box to establish a seal between the outer end portion and the tube box and the tube side outlet.
Optionally, the shell is connected with a shell-side inlet and a shell-side outlet which are communicated with the first chamber, the shell-side inlet is arranged at a position far away from the second chamber in the axial direction, and the shell-side outlet is arranged at a position close to the second chamber in the axial direction, so that the shell-side medium flows to the shell-side outlet and flows out from the shell-side outlet through the shell-side inlet and the first chamber in sequence.
Through above-mentioned technical scheme, in the floating head heat exchanger that this disclosure provided, through setting up fixed pipe box and output sleeve pipe in the floating head heat exchanger, realize the heat transfer against current between tube side medium and the shell side medium. Wherein, fixed tube housing one end fixed connection in fixed tube sheet and with the second cavity intercommunication, other end fixed connection in float the tube sheet and with float first cavity intercommunication, and output sleeve gap ground can remove to insert in case and fixed pipe box, and have the outer tip that exposes in the case outside, can make the whole floating head heat exchanger of outer tip outflow that the tube side medium in the floating head cavity passes through output sleeve like this, thereby make the tube side medium can carry out the heat exchange on the unidirectional, thereby realize heat transfer against the current. In addition, the outer tube is coaxially and is sleeved on the inner tube at intervals to play a role in heat insulation, so that heat loss is reduced, heat exchange between tube side media in the inner tube of the output sleeve and tube side media in the second cavity can be prevented, the temperature difference between tube side inlet media and tube side outlet media is effectively increased, and the heat exchange efficiency is improved. Therefore, the floating head heat exchanger that this disclosure provided simple structure, heat exchange efficiency are high to owing to not set up the split baffle, and the tube side medium temperature in the second cavity is even, thereby can eliminate the peripheral difference in temperature stress of tube sheet and equipment flange.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic structural view of a floating head heat exchanger provided in accordance with an embodiment of the present disclosure;
FIG. 2 is a schematic structural view of an outlet sleeve in a floating head heat exchanger provided in accordance with a specific embodiment of the present disclosure, wherein an insulation layer is shown;
fig. 3 is a schematic structural view of a fixed pipe sleeve and an output sleeve in a floating head heat exchanger provided according to an embodiment of the present disclosure in a connected state, wherein distance posts are shown;
fig. 4 is a schematic structural diagram of a floating head heat exchanger with an output sleeve and a tube-side outlet in a connected state according to an embodiment of the present disclosure.
Description of the reference numerals
1-a shell; 11-a first chamber; 12-shell side inlet; 13-shell side outlet; 2-a pipe box; 21-a second chamber; 22-tube side inlet; 23-tube pass outlet; 3-fixing the tube plate; 4-a heat exchange tube bundle; 41-baffle plate; 5-floating tube plate; 6-floating head cover; 61-floating head chamber; 7-fixing the pipe sleeve; 8-output sleeve; 81-outer tube; 82-an inner tube; 83-a thermal insulation layer; 84-distance poles; 91-flange plate; 92-a sealing gasket; 93-a sealing flange; 94-fasteners.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the present disclosure, the use of directional terms such as "inner and outer" means inner and outer with respect to the profile of the component itself, unless otherwise specified; moreover, the use of the terms first, second, etc. are intended to distinguish one element from another, and are not necessarily intended to have a sequential or chronological significance. Furthermore, in the following description, when referring to the figures, the same reference numbers in different figures denote the same or similar elements, unless otherwise explained. The foregoing definitions are provided to illustrate and describe the present disclosure only and should not be construed to limit the present disclosure.
According to a specific embodiment of the present disclosure, there is provided a floating head heat exchanger, which includes a shell 1, a tube box 2, a fixed tube plate 3, a heat exchange tube bundle 4, a floating tube plate 5 and a floating head cover 6, the shell 1 is configured to be tubular and has one end sealed and the other end open, an inner space of the shell 1 serves as a first chamber 11, the floating tube plate 5 and the floating head cover 6 are disposed in the first chamber 11 and together define a floating head chamber 61, the fixed tube plate 3 is hermetically connected to the tube box 2 to define a second chamber 21 and is hermetically connected to the opening of the shell 1, the heat exchange tube bundle 4 is located in the first chamber 11 and arranged along an axial direction of the shell 1 and has a first end and a second end opposite to each other in the axial direction, the first end is fixedly connected to the floating tube plate 5 disposed in the first chamber 11 and communicated with the floating head chamber 61, the second end is fixedly connected to the fixed tube plate 3 and communicated with the second chamber 21, the floating head type heat exchanger further comprises a fixed pipe sleeve 7 and an output sleeve 8, one end of the fixed pipe sleeve 7 is fixedly connected to the fixed pipe plate 3 and communicated with the second chamber 21, the other end of the fixed pipe sleeve 7 is fixedly connected to the floating pipe plate 5 and communicated with the floating head chamber 61, the output sleeve 8 is inserted into the pipe box 2 and the fixed pipe sleeve 7 in a clearance-removable mode and has an outer end portion exposed outside the pipe box 2, the output sleeve 8 comprises an outer pipe 81 and an inner pipe 82 which are connected, and the outer pipe 81 is coaxially sleeved on the inner pipe 82 in a clearance-free mode.
Through the technical scheme, in the floating head heat exchanger provided by the disclosure, the fixed pipe sleeve 7 and the output pipe sleeve 8 are arranged in the floating head heat exchanger, so that the countercurrent heat transfer between a tube side medium and a shell side medium is realized. Wherein, fixed pipe box 7 one end fixed connection is in fixed tube sheet 3 and communicates with second chamber 21, and the other end fixed connection is in floating tube sheet 5 and communicates with floating head chamber 61, and output sleeve 8 inserts in pipe case 2 and fixed pipe box 7 with clearance removably, and has the outer tip that exposes in the pipe case 2 outside, can make the tube side medium in floating head chamber 61 flow out whole floating head heat exchanger through the outer tip of output sleeve 8 like this to make the tube side medium can carry out the heat exchange in the single direction, thereby realize the heat transfer against the current. In addition, the outer tube 81 is coaxially and intermittently sleeved on the inner tube 82 to play a role in heat insulation, so that heat loss is reduced, heat exchange between tube side media in the inner tube 82 of the output sleeve 8 and tube side media in the second chamber 21 can be prevented, the temperature difference between tube side inlet media and tube side outlet media is effectively increased, and heat exchange efficiency is improved. Therefore, the floating head heat exchanger provided by the disclosure has the advantages of simple structure and high heat exchange efficiency, and because no pass partition plate is arranged, the temperature of the tube pass medium in the second chamber 21 is uniform, and the temperature difference stress at the periphery of the tube plate and the equipment flange can be eliminated.
In the specific embodiment provided by the present disclosure, referring to fig. 2, the output sleeve 8 may include a thermal insulation layer 83, the thermal insulation layer 83 is disposed in a gap between the outer pipe 81 and the inner pipe 82, and by disposing the thermal insulation layer 83 in the gap between the outer pipe 81 and the inner pipe 82, the tube side medium in the output sleeve 8 and the tube side medium in the second chamber 21 may be prevented from performing heat exchange, and thus the problem of the decrease in the heat exchange efficiency of the floating head heat exchanger due to the decrease in the temperature of the tube side medium in the second chamber 21 may be solved. It should be noted that the insulation layer 83 may be constructed of any suitable material, for example, the insulation layer 83 may be constructed of a non-metallic material, such as a fiberglass insulation layer, a asbestos insulation layer, a rock wool insulation layer, a silicate insulation layer, etc., and the disclosure is not limited thereto.
In the specific embodiment provided by the present disclosure, referring to fig. 2, the heat insulating layer 83 may be located in the second chamber 21, and in such an arrangement, on one hand, when the problem of reduction of the heat exchange efficiency of the floating head heat exchanger caused by reduction of the temperature of the tube-side medium in the second chamber 21 is solved, the cost of the heat exchanger can be reduced, and on the other hand, the output sleeve 8 located in the first chamber 11 and the shell-side medium can also exchange heat without affecting the temperature of the tube-side medium, so that the heat exchange efficiency of the whole heat exchanger can be improved.
In the embodiments provided by the present disclosure, as shown with reference to fig. 1 to 4, the output sleeve 8 may be arranged coaxially with the housing 1, so that the removal and installation of the output sleeve 8 from the fixing socket 7 within the housing 1 may be facilitated.
In the specific embodiment provided by the present disclosure, referring to fig. 3, a distance post 84 is provided in the gap between the outer pipe 81 and the fixed sleeve 7, the distance post 84 is configured to allow the outer pipe 81 to move axially relative to the fixed sleeve 7 and restrict the outer pipe 81 from moving radially relative to the fixed sleeve 7, the distance post 84 is provided such that a certain distance is maintained between the outer pipe 81 and the fixed sleeve 7, and the distance post may function as a slideway, so that the radial movement of the outer pipe 81 relative to the fixed sleeve 7 may be assisted, and the output sleeve 8 may be smoothly withdrawn from the fixed sleeve 7.
In the specific embodiments provided by the present disclosure, the distance posts 84 may be configured in any suitable manner. Alternatively, as shown in fig. 3, the distance posts 84 may be configured as a cylindrical structure, and both ends of the cylindrical structure in the axial direction of the housing 1 are provided with chamfered grooves so as to facilitate the smooth extraction of the output sleeve 8 from the fixing socket 7, and in other embodiments of the present disclosure, the distance posts 84 may be configured in other ways, and the present disclosure is not limited thereto.
As shown in fig. 3, the number of the distance posts 84 may be plural, and the plural distance posts 84 are spaced in the axial direction and the circumferential direction of the heat exchange tube bundle 4, so that the distance between the outer tube 81 and the fixing tube sleeve 7 is uniform, and the output sleeve 8 can be smoothly drawn out from the fixing tube sleeve 7 without colliding with the fixing tube sleeve 7.
In the specific embodiment provided by the present disclosure, the tube side inlet 22 of the second chamber 21 is connected to the tube box 2, and the tube side outlet 23 is connected to the outer end portion, so that the tube side medium flows to the tube side outlet 23 and flows out from the tube side outlet 23 via the tube side inlet 22, the second chamber 21, the heat exchange tube bundle 4, the floating head chamber 61 and the output sleeve 8 in sequence. That is, the tube-side medium enters the floating head chamber 61 in the first chamber 11 from the second chamber 21 via the heat exchange tube bundle 4, and finally flows from the outlet sleeve 8 to the outer end portion of the outlet sleeve 8 outside the tube box 2, in other words, the tube-side medium exchanges heat only with the shell-side medium in the first chamber 11 described below, thereby achieving heat exchange of the tube-side medium in the same direction.
In the specific embodiments provided by the present disclosure, the output cannula 8 may be configured with the tube-side outlet 23 in any suitable manner to effect a connection therebetween.
Alternatively, as shown in fig. 2, a sealing flange 93 may be attached to the outer end of the outlet sleeve 8, a flange 91 may be attached to the tube side outlet 23, the flange 91 is attached to the tube box 2 by fasteners 94, and the sealing flange 93 is compressed between the flange 91 and the tube box 2 to establish a seal between the outer end and the tube box 2 and the tube side outlet 23. Through the setting of sealing flange and flange dish connect output sleeve 8 and tube side export 23, be favorable to output sleeve 8 and tube side export 23's change and maintenance, when installation or dismantlement output sleeve, not only can install or dismantle output sleeve 8 and tube side export 23 together, then installation or dismantlement output sleeve 8 and tube side export 23 can, can also install or dismantle output sleeve 8 and tube side export 23 earlier, then with output sleeve 8 installation or dismantlement in fixed pipe box 7 can.
Alternatively, as shown in fig. 4, the outlet sleeve 8 may be formed integrally with the tube-side outlet 23 and mounted to the outside of the tube box 2 by means of a flange 91 and a sealing gasket 92. Output sleeve 8 and tube side export 23 integrated into one piece can make the structure of heat exchanger simple more compact, when installation or dismantlement output sleeve, only need with output sleeve 8 with tube side export 23 install together or dismantle can, simple structure and convenient operation are swift.
In the specific embodiment provided by the present disclosure, referring to fig. 1, the shell 1 is connected with a shell-side inlet 12 and a shell-side outlet 13 which are communicated with the first chamber 11, the shell-side inlet 12 is arranged at a position far away from the second chamber 21 in the axial direction, and the shell-side outlet 13 is arranged at a position close to the second chamber 21 in the axial direction, so that the shell-side medium flows to the shell-side outlet 13 and flows out from the shell-side outlet 13 through the shell-side inlet 12, the first chamber 11 in sequence. The shell-side inlet 12 and the shell-side outlet 13 are arranged to enable the shell-side medium to exchange heat with the tube-side medium to the maximum extent, and the heat exchange efficiency of the heat exchanger is improved. In addition, in order to increase the contact area between the shell-side medium and the heat exchange tube bundle 4 as much as possible, a plurality of baffles 41 may be disposed on the heat exchange tube bundle 4 to improve the heat exchange efficiency. In addition, the present disclosure is not limited in this regard as the arrangement of baffles 41 on heat exchange tube bundle 4 is well known in the art.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A floating head heat exchanger comprises a shell (1), a tube box (2), a fixed tube plate (3), a heat exchange tube bundle (4), a floating tube plate (5) and a floating head cover (6),
the housing (1) is tubular and closed at one end and open at the other end, the inner space of the housing (1) serves as a first chamber (11), the floating tube plate (5) and the floating head cover (6) are arranged in the first chamber (11) and together define a floating head chamber (61),
the fixed tube plate (3) is hermetically connected to the tube box (2) to define a second chamber (21) and to an opening of the shell (1),
the bundle (4) of heat exchange tubes being located in the first chamber (11) and arranged in the axial direction of the shell (1) and having a first end and a second end axially opposite each other, the first end being fixedly connected to the floating tube plate (5) provided in the first chamber (11) and communicating with the floating head chamber (61), the second end being fixedly connected to the fixed tube plate (3) and communicating with the second chamber (21),
the floating head type heat exchanger is characterized by further comprising a fixed pipe sleeve (7) and an output sleeve (8), wherein one end of the fixed pipe sleeve (7) is fixedly connected to the fixed pipe plate (3) and communicated with the second chamber (21), the other end of the fixed pipe sleeve (7) is fixedly connected to the floating pipe plate (5) and communicated with the floating head chamber (61), the output sleeve (8) is inserted into the pipe box (2) and the fixed pipe sleeve (7) in a clearance and removable mode and is provided with an outer end portion exposed to the outer side of the pipe box (2), the output sleeve (8) comprises an outer pipe (81) and an inner pipe (82) which are connected, and the outer pipe (81) is coaxially sleeved on the inner pipe (82) in a clearance mode.
2. A floating head heat exchanger according to claim 1, wherein the output casing (8) comprises a thermally insulating layer (83), the thermally insulating layer (83) being arranged in a gap between the outer pipe (81) and the inner pipe (82).
3. A floating head heat exchanger according to claim 2, wherein the thermally insulating layer (83) is located in the second chamber (21).
4. A floating head heat exchanger according to claim 1, wherein the output sleeve (8) is arranged coaxially with the housing (1).
5. A floating head heat exchanger according to claim 1, characterized in that distance posts (84) are provided in the gap between the outer pipe (81) and the fixed pipe sleeve (7), the distance posts (84) being configured to allow axial movement of the outer pipe (81) relative to the fixed pipe sleeve (7) and to limit radial movement of the outer pipe (81) relative to the fixed pipe sleeve (7).
6. A floating head heat exchanger according to claim 5, wherein the number of distance posts (84) is plural, and the plural distance posts (84) are arranged at intervals in the axial direction and the circumferential direction of the heat exchange tube bundle (4).
7. A floating head heat exchanger according to any one of claims 1-6, wherein the tube box (2) is connected with a tube side inlet (22) of the second chamber (21), and the outer end is connected with a tube side outlet (23), so that a tube side medium flows to the tube side outlet (23) and flows out of the tube side outlet (23) via the tube side inlet (22), the second chamber (21), the heat exchange tube bundle (4), the floating head chamber (61) and the output sleeve (8) in sequence.
8. A floating head heat exchanger according to claim 7, wherein the outlet sleeve (8) is integrally formed with the tube side outlet (23) and is mounted to the outside of the tube box (2) by means of a flange (91) and a sealing gasket (92).
9. A floating head heat exchanger according to claim 7, wherein a sealing flange (93) is connected to the outer end, a flange (91) is connected to the tube side outlet (23), the flange (91) is connected to the tube box (2) by means of a fastening member (94), and the sealing flange (93) is compressed between the flange (91) and the tube box (2) to establish a seal between the outer end and the tube box (2) and the tube side outlet (23).
10. A floating head heat exchanger according to claim 1, wherein a shell-side inlet (12) and a shell-side outlet (13) are connected to the housing (1) and communicate with the first chamber (11), the shell-side inlet (12) being arranged axially remote from the second chamber (21) and the shell-side outlet (13) being arranged axially close to the second chamber (21) such that shell-side medium flows in sequence through the shell-side inlet (12), the first chamber (11) to the shell-side outlet (13) and out of the shell-side outlet (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022511900.6U CN213778721U (en) | 2020-11-03 | 2020-11-03 | Floating head heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022511900.6U CN213778721U (en) | 2020-11-03 | 2020-11-03 | Floating head heat exchanger |
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| Publication Number | Publication Date |
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| CN213778721U true CN213778721U (en) | 2021-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022511900.6U Active CN213778721U (en) | 2020-11-03 | 2020-11-03 | Floating head heat exchanger |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114234701A (en) * | 2021-12-31 | 2022-03-25 | 河南恒天久大实业有限公司 | Heat exchanger with telescopic tube plate |
| CN114396815A (en) * | 2022-01-20 | 2022-04-26 | 济南新材料产业技术研究院 | Shell and tube heat exchanger |
-
2020
- 2020-11-03 CN CN202022511900.6U patent/CN213778721U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114234701A (en) * | 2021-12-31 | 2022-03-25 | 河南恒天久大实业有限公司 | Heat exchanger with telescopic tube plate |
| CN114396815A (en) * | 2022-01-20 | 2022-04-26 | 济南新材料产业技术研究院 | Shell and tube heat exchanger |
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