CN113137873A - High-pressure high-temperature-difference pure countercurrent multi-fluid heat exchanger - Google Patents
High-pressure high-temperature-difference pure countercurrent multi-fluid heat exchanger Download PDFInfo
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- CN113137873A CN113137873A CN202110410743.6A CN202110410743A CN113137873A CN 113137873 A CN113137873 A CN 113137873A CN 202110410743 A CN202110410743 A CN 202110410743A CN 113137873 A CN113137873 A CN 113137873A
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- tube
- box
- tube box
- shell
- cold flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/007—Auxiliary supports for elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A high-pressure high-temperature difference pure countercurrent multi-fluid heat exchanger comprises a horizontally arranged U-shaped tube bundle, wherein the U-shaped tube bundle is arranged in a shell, a heat exchange tube in the center of the upper section of the U-shaped tube bundle is hermetically communicated with an upper inner tube box through a tube hole in the middle of an upper tube plate, the rest heat exchange tubes are hermetically communicated with an upper outer tube box through tube holes in the periphery of the upper tube plate, one end of a cold flow II outlet is communicated with the upper inner tube box, and the other end of the cold flow II outlet is hermetically extended out of the upper outer tube box; the heat exchange tube in the center of the lower section of the U-shaped tube bundle is hermetically communicated with the lower inner tube box through a tube hole in the middle of the lower tube plate, the rest heat exchange tubes are hermetically communicated with the lower outer tube box through tube holes in the periphery of the lower tube plate, one end of an inlet of the cold flow II is communicated with the lower inner tube box, and the other end of the inlet of the cold flow II extends out of the lower outer tube box in a sealing manner; the upper part of the shell close to the upper tube plate is provided with a shell pass inlet; the lower part of the shell close to the lower tube plate is provided with a shell pass outlet. The invention has simple and compact structure and small occupied area, and can realize the pure countercurrent heat transfer of the multi-fluid with high pressure and high temperature difference of cold and heat flows.
Description
Technical Field
The invention belongs to the technical field of heat exchangers, and relates to a high-pressure, high-temperature-difference and pure-countercurrent multi-fluid heat exchanger.
Background
Currently, multi-fluid heat exchangers employ heat exchangers comprising: the plate-fin heat exchanger, the wound tube heat exchanger and the shell-and-tube heat exchanger have the advantages that the heat transfer efficiency of the plate-fin heat exchanger is high, the wound tube heat exchanger is inferior, and the common shell-and-tube heat exchanger is the lowest. When the heat transfer fluid is medium or low pressure medium, the plate fin heat exchanger is preferred. When one heat transfer fluid is high-pressure and the other heat transfer fluid is medium-pressure or low-pressure, the plate-fin heat exchanger can only be used in medium-pressure or low-pressure working conditions, so that the plate-fin heat exchanger is not suitable for the working conditions; the wound tube heat exchanger can be suitable for the working conditions of low pressure in the tube pass and high pressure in the shell pass, so the wound tube heat exchanger is preferably considered. When two or more than two kinds of fluid are high-pressure media, the wound tube type heat exchanger is not suitable any more, and only the shell-and-tube type heat exchanger can be selected at the moment.
Currently, high pressure multi-fluid shell and tube heat exchangers include conventional U-tube heat exchangers and fixed tube and plate heat exchangers. When a conventional U-shaped tube type heat exchanger is adopted, the tube box partition plate of the heat exchanger adopts a flat plate structure, and the thickness of the tube box partition plate is very thick due to the high-pressure condition of a tube side medium, so that the tube box partition plate is difficult to weld and seal, even cannot be designed and processed, and when temperature difference stress loads of tubes and shell sides are superposed, the tube plate and the connection of the tube plate with the tube box and a shell are very easy to lose efficacy. When the fixed tube-plate heat exchanger structure is adopted, the equipment shell diameter is large, the efficiency is low, the investment is high, and when the temperature difference stress load of the tube side and the shell side is attached, the fixed tube-plate heat exchanger cannot be used due to the fact that the expansion joint cannot be arranged under the high-pressure working condition.
Disclosure of Invention
The invention provides a high-pressure high-temperature difference pure countercurrent multi-fluid heat exchanger, which provides a feasible solution for the conventional high-pressure multi-fluid heat exchanger and can realize high-pressure high-temperature difference and pure countercurrent heat transfer of fluid.
The purpose of the invention is realized by the following technical scheme:
a high-pressure high-temperature difference pure countercurrent multi-fluid heat exchanger comprises a horizontally arranged U-shaped tube bundle, wherein the U-shaped tube bundle is arranged in a shell, a heat exchange tube in the center of the upper section of the U-shaped tube bundle is communicated with an upper inner tube box in a sealing mode through a tube hole in the middle of an upper tube plate, the rest heat exchange tubes are communicated with an upper outer tube box in a sealing mode through tube holes in the periphery of the upper tube plate, one end of a cold flow II outlet is communicated with the upper inner tube box, the other end of the cold flow II outlet extends out of the upper outer tube box in a sealing mode, and a cold flow I outlet is formed in the upper portion of the upper outer tube box; the heat exchange tube in the center of the lower section of the U-shaped tube bundle is hermetically communicated with the lower inner tube box through a tube hole in the middle of the lower tube plate, the rest heat exchange tubes are hermetically communicated with the lower outer tube box through tube holes in the periphery of the lower tube plate, one end of an inlet of the cold flow II is communicated with the lower inner tube box, and the other end of the inlet of the cold flow II extends out of the lower outer tube box in a sealing manner; the lower part of the lower outer pipe box is provided with a cold flow I inlet; the upper part of the shell close to the upper tube plate is provided with a shell pass inlet; the lower part of the shell close to the lower tube plate is provided with a shell pass outlet.
And a feeding distribution plate is arranged between the lower outer tube box and the lower inner tube box.
The upper outer tube box, the upper inner tube box, the lower outer tube box and the lower inner tube box are all composed of pressure-resistant cylinders and pressure-resistant spherical shells.
The shell is a U-shaped shell formed by hermetically connecting an upper section shell, a middle section shell and a lower section shell.
The invention has simple and compact structure and small occupied area, and can realize the pure countercurrent heat transfer of the multi-fluid with high pressure and high temperature difference of cold and heat flows.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic cross-sectional view of a tubesheet of the present invention;
in the figure: the device comprises a cold flow II inlet 1, a lower outer tube box 2, a cold flow I inlet 3, a lower inner tube box 4, a hot flow outlet 5, a support base 6, a U-shaped tube bundle 7, a lower section shell 8, a feeding distributor 9, a lower special-shaped tube plate 10, a cold flow II outlet 11, an upper outer tube box 12, a cold flow I outlet 13, an upper inner tube box 14, an upper special-shaped tube plate 15, a hot flow inlet 16, an upper section shell 17 and a middle section shell 18.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1, 2 and 3, a high-pressure high-temperature difference pure countercurrent multi-fluid heat exchanger comprises a horizontally arranged U-shaped tube bundle, wherein the U-shaped tube bundle is arranged in a shell, a heat exchange tube in the center of the upper section of the U-shaped tube bundle 7 is hermetically communicated with an upper inner tube box 14 through a tube hole in the middle of an upper tube plate 15, the rest heat exchange tubes are hermetically communicated with an upper outer tube box 12 through tube holes in the periphery of the upper tube plate 15, one end of a cold flow II outlet 11 is communicated with the upper inner tube box 14, the other end of the cold flow II outlet extends out of the upper outer tube box 12 in a sealing manner, and a cold flow I outlet 13 is arranged at the upper part of the upper outer tube box 12; the heat exchange tube in the center of the lower section of the U-shaped tube bundle 7 is hermetically communicated with the lower inner tube box 4 through the tube hole in the middle of the lower tube plate 10, the rest heat exchange tubes are hermetically communicated with the lower outer tube box 2 through the tube holes in the periphery of the lower tube plate 10, one end of the cold flow II inlet 1 is communicated with the lower inner tube box 4, and the other end of the cold flow II inlet extends out of the lower outer tube box 2 in a sealing manner; the lower part of the lower outer tube box 2 is provided with a cold flow I inlet 3; the upper part of the shell close to the upper tube plate 15 is provided with a heat flow inlet 16; the lower part of the shell near the lower tube plate 10 is provided with a hot fluid outlet 5.
Wherein the corresponding upper tube plate annular area between the upper outer tube box 12 and the upper inner tube box 14 and the corresponding lower tube plate annular area between the lower outer tube box 2 and the lower inner tube box 4 are connected by a group of U-shaped heat exchange tubes; the upper inner tube box 14 and the lower inner tube box 4 are connected by another set of U-shaped heat exchange tubes in the circular area corresponding to the upper tube sheet and the circular area corresponding to the lower tube sheet. The cold flow II flows through the inner tube box, the cold flow I flows through the outer tube box, and the hot flow flows through the shell pass, so that the pure countercurrent heat transfer of multiple fluids is realized through the U-shaped tube bundle.
The upper and lower pipe plates arranged in the invention can avoid the influence of temperature difference stress of the inlet and outlet of the fluid on the single side, and the U-shaped pipe bundle also effectively absorbs the temperature difference stress of the fluid on the pipe side and the shell side, so that the invention can adapt to larger temperature difference stress.
A feeding distribution plate 9 is arranged between the lower outer tube box 2 and the lower inner tube box 4; the annular section between the lower outer tube box 2 and the lower inner tube box 4 is the section of an inlet tube box of the cold flow I, and the cold flow I cannot be uniformly distributed into the section of the inlet of the tube plate heat exchange tube due to the influence of the tube box in the section.
The upper outer tube box 12, the upper inner tube box 14, the lower outer tube box 2 and the lower inner tube box 4 are all composed of pressure-resistant cylinders and pressure-resistant spherical shells. The upper section shell pressure-resistant shell and the lower section shell pressure-resistant shell are respectively welded with the corresponding upper tube plate and lower tube plate; the high pressure resistance and the sealing performance of the invention are ensured by utilizing the advantage of good pressure resistance of the rotary shell.
The shell is formed by connecting an upper section shell 17, a middle section shell 18 and a lower section shell 8 in a sealing way to form a U-shaped shell. The conventional high-pressure container has two small shells instead of one large shell, and has high heat transfer efficiency, low equipment weight and low investment.
The shell is supported by a support seat 6, and the upper support seat 6 and the lower support seat 6 in the U-shaped shell groove are connected into a whole.
The working process of the invention is as follows:
three fluids, namely a cold fluid I and a cold fluid II exchange heat with the hot fluid. The cold flow I enters an annular closed space formed by a lower outer tube box 2 and a lower inner tube box 4 through a cold flow I inlet 3, uniformly distributed by a feeding distributor 9, enters a group of U-shaped tube groups connected with a lower tube plate 10, and enters an annular closed space formed by an upper outer tube box 12 and an upper inner tube box 14 connected with an upper tube plate 15 after being subjected to countercurrent heat transfer with hot fluid outside the tubes through the U-shaped tube groups, and flows out from a cold flow I outlet 13; the cold flow II enters the lower inner tube box 4 through the cold flow II inlet 1, then enters another group of U-shaped tube groups connected with the lower tube plate 10, enters the upper inner tube box 14 connected with the upper tube plate 15 after being subjected to countercurrent heat transfer with hot fluid outside the tube through the U-shaped tube groups, and flows out from the cold flow II outlet 11. The hot flow flows into the upper section shell 17 from the hot flow inlet 16, is in countercurrent heat transfer with the cold flow I and the cold flow II outside the U-shaped tube bundle 7, and flows out from the hot flow outlet 5 on the lower section shell 8.
Claims (4)
1. A high pressure high temperature differential pure countercurrent multi-fluid heat exchanger comprising a horizontally disposed U-shaped tube bundle mounted in a housing, characterized in that: the heat exchange tubes in the center of the upper section of the U-shaped tube bundle (7) are hermetically communicated with an upper inner tube box (14) through tube holes in the middle of an upper tube plate (15), the rest heat exchange tubes are hermetically communicated with an upper outer tube box (12) through tube holes in the periphery of the upper tube plate (15), one end of a cold flow II outlet (11) is communicated with the upper inner tube box (14), the other end of the cold flow II outlet extends out of the upper outer tube box (12) in a sealing manner, and a cold flow I outlet (13) is arranged at the upper part of the upper outer tube box (12); the heat exchange tube in the center of the lower section of the U-shaped tube bundle (7) is hermetically communicated with the lower inner tube box (4) through a tube hole in the middle of the lower tube plate (10), the rest heat exchange tubes are hermetically communicated with the lower outer tube box (2) through tube holes in the periphery of the lower tube plate (10), one end of a cold flow II inlet (1) is communicated with the lower inner tube box (4), and the other end of the cold flow II inlet extends out of the lower outer tube box (2) in a sealing manner; the lower part of the lower outer tube box (2) is provided with a cold flow I inlet (3); a shell side inlet (16) is arranged at the upper part of the shell close to the upper tube plate (15); the lower part of the shell close to the lower tube plate (10) is provided with a shell pass outlet (5).
2. A high pressure high temperature differential pure countercurrent multi-fluid heat exchanger as defined in claim 1 wherein: and a feeding distribution plate (9) is arranged between the lower outer tube box (2) and the lower inner tube box (4).
3. A high pressure high temperature differential pure countercurrent multi-fluid heat exchanger as defined in claim 1 wherein: the upper outer tube box (12), the upper inner tube box (14), the lower outer tube box (2) and the lower inner tube box (4) are all composed of pressure-resistant cylinders and pressure-resistant spherical shells.
4. A high pressure high temperature differential pure countercurrent multi-fluid heat exchanger as defined in any one of claims 1 to 3 wherein: the shell is a U-shaped shell formed by hermetically connecting an upper section shell (17), a middle section shell (18) and a lower section shell (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110410743.6A CN113137873A (en) | 2021-04-16 | 2021-04-16 | High-pressure high-temperature-difference pure countercurrent multi-fluid heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110410743.6A CN113137873A (en) | 2021-04-16 | 2021-04-16 | High-pressure high-temperature-difference pure countercurrent multi-fluid heat exchanger |
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| Publication Number | Publication Date |
|---|---|
| CN113137873A true CN113137873A (en) | 2021-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110410743.6A Pending CN113137873A (en) | 2021-04-16 | 2021-04-16 | High-pressure high-temperature-difference pure countercurrent multi-fluid heat exchanger |
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| CN (1) | CN113137873A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145947A (en) * | 2019-06-19 | 2019-08-20 | 哈尔滨汽轮机厂辅机工程有限公司 | A kind of high temperature and pressure compressed air heat exchanger structure |
-
2021
- 2021-04-16 CN CN202110410743.6A patent/CN113137873A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145947A (en) * | 2019-06-19 | 2019-08-20 | 哈尔滨汽轮机厂辅机工程有限公司 | A kind of high temperature and pressure compressed air heat exchanger structure |
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