CN111197943B - Intermediate medium heat exchanger with overheating device - Google Patents
Intermediate medium heat exchanger with overheating device Download PDFInfo
- Publication number
- CN111197943B CN111197943B CN202010098715.0A CN202010098715A CN111197943B CN 111197943 B CN111197943 B CN 111197943B CN 202010098715 A CN202010098715 A CN 202010098715A CN 111197943 B CN111197943 B CN 111197943B
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- China
- Prior art keywords
- heat exchange
- shell
- plates
- opening
- baffle plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000013021 overheating Methods 0.000 title abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 8
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 70
- 239000001294 propane Substances 0.000 claims description 33
- 239000007788 liquid Substances 0.000 claims description 29
- 239000007789 gas Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 6
- 238000000053 physical method Methods 0.000 description 4
- 239000003949 liquefied natural gas Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
- F22G3/006—Steam superheaters with heating tubes
-
- 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
- F28F9/02—Header boxes; End plates
- F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluid Mechanics (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses an intermediate medium heat exchanger with an overheating device, which comprises a shell, wherein the top of the shell is provided with an outlet; the tube plates are respectively arranged at two ends of the shell; the first heat exchange tube bundles are distributed at the inner bottom of the shell and are fixed between the two tube plates; the upper baffle is distributed at the inner top of the shell, is connected with the shell and the inner wall of the tube plate in a sealing way, and is provided with a first opening; the lower baffle is positioned below the upper baffle and is in sealing connection with the shell and the inner wall of the tube plate, a second opening is formed in the lower baffle, and a steam flow channel is formed between the lower baffle and the upper baffle; the baffle plates are at least arranged in the steam flow channel between the first opening of the upper baffle plate and the second opening of the lower baffle plate, and the second heat exchange tube bundle penetrates through the baffle plates and is fixed between the two tube plates.
Description
Technical Field
The invention relates to an intermediate medium heat exchanger with a superheating device, belongs to the technical field of heat exchangers, and can be applied to a liquefied natural gas cold energy power generation system, in particular to a liquefied natural gas heat exchanger applied to the liquefied natural gas field.
Background
In a conventional propane evaporator, as shown in fig. 1, a heat medium is introduced into a heat exchange tube to heat liquid propane outside the tube, and the propane is evaporated into saturated propane gas. Saturated propane gas moves to the next-stage equipment through the outlet of the propane evaporator, and because the saturated propane gas is evaporated from liquid propane, part of the liquid propane can be carried out of the evaporator in the form of liquid drops, but in a chemical system, the propane gas at the outlet of the evaporator cannot be carried with liquid due to the process requirement of equipment at the rear end of the evaporator, and the liquid carrying can cause great potential safety hazard to the safe operation of subsequent equipment.
The technological guarantee means for eliminating the liquid entrainment mainly comprises an overheating method and a physical method, wherein the overheating method is to continuously heat saturated propane gas with liquid propane in an evaporator, so that the entrained liquid can be heated and evaporated into gas, and the conventional implementation method is to additionally arrange a superheater at the rear end of the evaporator; the principle of the physical method is mainly to balance the gravity of the liquid drop with the resistance generated when the liquid drop rises, reduce the resistance generated when the liquid drop rises by adopting modes of reducing the flow rate of the liquid drop and the like, so that the gravity is larger than the resistance, the liquid drop falls into the evaporator again, the conventional implementation method of the physical method is to provide enough gas-liquid separation space for propane gas at the upper part in the shell 1 of the evaporator, replace heat pipes at the lower part in the shell 1, and fix the heat exchange pipes on the tube plate 2.
However, the above method has a plurality of drawbacks, namely, only the heat exchange tube is fixed on the tube plate 2 at the lower part of the shell 1, when the pressure in the shell 1 is large, the stress of the shell 1 and the tube plate 2 is uneven, the service life of the equipment is affected, and the manufacturing cost of the equipment is increased. 2. The propane vapor generated by heating liquid propane directly exits the device, and the physical method may not completely remove small-diameter liquid drops entrained in the propane vapor, thereby affecting the operation of the next-stage device. 3. Additional superheaters are required to be arranged outside the equipment to achieve the purpose of superheating the gas. The superheater improves heat exchange efficiency by changing the flow form of gas, but the additional superheater cannot be configured by utilizing the parts such as the tube plate 2 and the cylinder body of the original evaporator, and additional parts are needed, so that the scheme of configuring the superheater on the heat exchanger is poor in economy due to the additional parts although the heat exchange area needed by the separate superheater is small and the heat exchange tubes are few, and meanwhile, additional equipment occupies additional space, and an additional lead tube increases the pressure drop of a propane medium.
Disclosure of Invention
In view of the foregoing, it is an object of the present invention to provide an intermediate medium heat exchanger with a superheating device.
In order to achieve the above purpose, the invention adopts the following technical scheme that the intermediate medium heat exchanger with the overheating device comprises:
the top of the shell is provided with an outlet;
the tube plates are respectively arranged at two ends of the shell;
the first heat exchange tube bundles are distributed at the inner bottom of the shell and are fixed between the two tube plates;
the upper baffle is distributed at the inner top of the shell, is connected with the shell and the inner wall of the tube plate in a sealing way, and is provided with a first opening;
The lower baffle is positioned below the upper baffle and is in sealing connection with the shell and the inner wall of the tube plate, a second opening is formed in the lower baffle, and a steam flow channel is formed between the lower baffle and the upper baffle;
a baffle plate, a plurality of baffle plates are arranged in the steam flow channel at least between the first opening of the upper baffle plate and the second opening of the lower baffle plate,
And the second heat exchange tube bundle passes through the baffle plates and is fixed between the two tube plates.
Further, a plurality of baffle plates are arranged in the steam flow channel between the first opening of the upper baffle plate and the second opening of the lower baffle plate in a mode of being perpendicular to the steam flow direction, and are arranged in a staggered mode up and down along the steam flow direction.
Further, the outlet is disposed proximate an upstream end of the second heat exchange tube bundle, the first opening is disposed directly below the outlet, and the second opening is disposed proximate a downstream end of the second heat exchange tube bundle.
Further, the outlet is arranged at the top center of the shell, the first opening is arranged right below the outlet, and the second opening comprises two openings arranged at two ends of the lower baffle.
Further, the distance between two adjacent baffle plates is 90% of the diameter of the shell.
Further, the first heat exchange tube bundle and the second heat exchange tube bundle are composed of a plurality of heat exchange tubes which are arranged in parallel, the number of the heat exchange tubes in the first heat exchange tube bundle is larger than that of the heat exchange tubes in the second heat exchange tube bundle, and two ends of the heat exchange tubes respectively extend out of the tube plates on the corresponding sides.
Further, the first heat exchange tube bundle and the second heat exchange tube bundle flow through a thermal medium.
Further, an intermediate medium is placed at the inner bottom of the shell, and the intermediate medium is liquid propane.
The invention adopts the technical proposal, and has the following advantages: the upper baffle plate, the lower baffle plate, the baffle plate and the second heat exchange tube bundle form the overheating device arranged at the inner top of the shell, so that intermediate medium in the heat exchanger is fully overheated, steam with liquid drops is prevented from entering next-stage equipment, the heat exchanger and the overheating device are integrated, the superheater is not required to be arranged outside the heat exchanger, and the equipment investment cost can be reduced. The first heat exchange tube bundles and the overheating devices are correspondingly distributed at the upper part and the lower part of the shell and fixed between the two tube plates, so that the stress of the upper part and the lower part of the tube plates can be balanced, and the structure of the heat exchanger is more reasonable.
Drawings
FIG. 1 is a schematic structural view of a propane evaporator;
FIG. 2 is a schematic view of the overall structure of the present invention;
FIG. 3 is a schematic left-hand view of the present invention;
FIG. 4 is a schematic view of the structure of the baffle of the present invention;
In the figure, 1, a shell; 2. a tube sheet; 3. a first heat exchange tube bundle; 4. an upper baffle; 5. a lower baffle; 6. a baffle plate; 7. and a second heat exchange tube bundle.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples. It is to be understood, however, that the drawings are designed solely for the purposes of providing a better understanding of the invention and are not to be construed as limiting the invention.
As shown in fig. 2 and 3, the intermediate medium heat exchanger with the overheating device provided by the invention comprises a shell 1, a tube plate 2, a first heat exchange tube bundle 3, an upper baffle 4, a lower baffle 5, a baffle plate 6 and a second heat exchange tube bundle 7; the top of the shell 1 is provided with an outlet; the two tube plates 2 are respectively arranged at two ends of the shell 1; the first heat exchange tube bundles 3 are distributed at the inner bottom of the shell 1 and are fixed between the two tube plates 2; the upper baffle plate 4 is distributed at the inner top of the shell 1 and is in sealing connection with the inner walls of the shell 1 and the tube plate 2, and a first opening is formed in the upper baffle plate 4; the lower baffle plate 5 is positioned below the upper baffle plate 4, is in sealing connection with the inner walls of the shell 1 and the tube plate 2, and is provided with a second opening; a steam flow channel is formed between the upper baffle plate 4 and the lower baffle plate 5, a plurality of baffle plates 6 are at least arranged in the steam flow channel between the first opening of the upper baffle plate 4 and the second opening of the lower baffle plate 5, and a second heat exchange tube bundle 7 passes through the baffle plates 6 and is fixed between the two tube plates 2.
In a preferred embodiment, the plurality of baffles 6 are arranged in the steam flow channel between the first opening of the upper baffle 4 and the second opening of the lower baffle 5 in a manner perpendicular to the steam flow direction, and are staggered up and down along the steam flow direction, so that steam flows in a wave shape in the steam flow channel, the flow path of the steam in the steam flow channel is well increased, and the steam and the second heat exchange tube bundle are enabled to exchange heat fully, so that the overheated intermediate medium is obtained.
In a preferred embodiment, the outlet is provided near the upstream end of the second heat exchanger tube bundle 7, the first opening being provided directly below the outlet, and the second opening being provided near the downstream end of the second heat exchanger tube bundle 7.
In a preferred embodiment, the outlet is provided at the top center of the housing 1, the first opening is provided directly under the outlet, and the second opening comprises two openings provided at both ends of the lower baffle 5; compared with single-side air intake, the air intake from the openings at the two ends of the lower baffle plate 5 can ensure that the propane steam is fully overheated, and meanwhile, the pressure drop can be reduced by 50 percent compared with a single-side air intake mode.
In a preferred embodiment, the spacing between adjacent baffles 6 is 90% of the diameter of the housing 1, which reduces the velocity of the steam flow between adjacent baffles and thus reduces the pressure drop of the steam as it flows along the flow path.
In a preferred embodiment, the first heat exchange tube bundle 3 and the second heat exchange tube bundle 7 are composed of a plurality of heat exchange tubes arranged in parallel, the number of the heat exchange tubes in the first heat exchange tube bundle 3 is larger than that of the heat exchange tubes in the second heat exchange tube bundle 7, and two ends of each heat exchange tube respectively extend out of the tube plates 2 on the corresponding sides.
In a preferred embodiment, the first heat exchange tube bundle 3 and the second heat exchange tube bundle 7 flow through a hot medium, such as sea water.
In a preferred embodiment, the inner bottom of the housing 1 is provided with an intermediate medium, which may be liquid propane.
The working principle of the invention is as follows:
The heat medium enters the first heat exchange tube bundle 3, liquid propane in the shell 1 is heated to generate propane steam, at the moment, the propane steam contains a small amount of liquid drops, the propane steam with the liquid drops enters the steam channel from the second opening of the lower baffle plate 5, the propane steam flows through the baffle plates 6 for multiple times, the flow path of the propane steam in the steam channel is increased, the propane steam with the liquid drops is enabled to exchange heat with the heat medium in the second heat exchange tube bundle 7 sufficiently, the liquid drops in the propane steam are enabled to be completely vaporized, the overheated propane gas enters the next-stage equipment through the first opening of the upper baffle plate 4 and the outlet of the shell 1, and the temperature of the outlet can be controlled by adjusting the flow rate of the heat medium entering the second heat exchange tube bundle 7. The upper baffle plate 4, the lower baffle plate 5, the baffle plate 6 and the second heat exchange tube bundle 7 form the superheating device arranged at the inner top of the shell 1, so that the propane steam can be fully superheated, a superheater is not required to be arranged outside the heat exchanger, and the equipment investment can be reduced; the first heat exchange tube bundle 3 and the overheating device are arranged at the upper part and the lower part of the shell 1 and are fixed between the two tube plates 2, so that the stress of the upper part and the lower part of the tube plates 2 can be balanced, each heat exchange tube in the first heat exchange tube bundle 7 passes through all the baffle plates 6, a window area formed between the baffle plates 6 is free of unsupported heat exchange tubes, the good support of the baffle plates 6 on the heat exchange tubes reduces the possibility of vibration of the heat exchange tubes, the distance between the baffle plates 6 and the baffle plates 6 is increased, the possibility of vibration of the heat exchange tubes does not occur, the structure of the heat exchanger is more reasonable, and the calculated thickness of the tube plates 2 can be reduced by 15%.
Example 1
The diameter of the shell 1 of the heat exchanger is 2800mm, and the length is 11000mm. The design pressure of the shell 1 is 2.03MPa, and the design temperature is-60/60 ℃. 4081 heat exchange tubes are distributed at the inner bottom of the shell 1 to form a first heat exchange tube bundle 3, and the heat exchange tubes are of the specification353 Heat exchange tubes are distributed at the inner top of the shell 1 to form a second heat exchange tube bundle 7, the 353 heat exchange tubes are divided into 5 rows from top to bottom, all the 5 rows of heat exchange tubes penetrate through all the baffle plates 6, an unsupported heat exchange tube is arranged in a window area formed between the baffle plates 6, the good support property of the baffle plates 6 on the heat exchange tubes reduces the possibility of vibration of the heat exchange tubes, the distance between the baffle plates 6 and the baffle plates 6 is increased, the possibility of vibration of the heat exchange tubes is avoided, the distance between every two adjacent baffle plates 6 is 90% of the diameter of the shell 1, so that the air flow speed of steam between the two adjacent baffle plates can be reduced, and the pressure drop of the steam flowing along a flow path is reduced; heat exchange tube specification/>By calculating the tube sheet 2 thickness to be 150mm, the wall thickness of the tube sheet 2 is reduced by 15% compared to a conventional heat exchanger.
The heat exchanger is filled with liquid propane, the pressure is 381KPa, the temperature is minus 7 ℃, the seawater is used as a heat medium, the pressure is 225KPa, the temperature is 10 ℃, and the liquid propane enters the heat exchange tube. The outlet propane gas had a temperature of 3 c, above the saturation temperature of propane at 381KPa, and contained no liquid droplets.
The pressure of the propane vapor at the outlet of the apparatus was 379KPa, and the pressure loss of the superheating apparatus was 2KPa, compared to the pressure 381KPa in the housing.
The present invention has been described with reference to the above embodiments, and the structure, arrangement and connection of the components may be varied. On the basis of the technical scheme, the improvement or equivalent transformation of the individual components according to the principles of the invention should not be excluded from the protection scope of the invention.
Claims (1)
1. An intermediate medium heat exchanger with superheating device, comprising:
A shell (1), the top of which is provided with an outlet;
The tube plates (2) are respectively arranged at two ends of the shell (1);
the first heat exchange tube bundles (3) are distributed at the inner bottom of the shell (1) and are fixed between the two tube plates (2);
the upper baffle plates (4) are distributed at the inner top of the shell (1) and are in sealing connection with the shell (1) and the inner wall of the tube plate (2), and the upper baffle plates (4) are provided with first openings;
The lower baffle plate (5) is positioned below the upper baffle plate (4) and is in sealing connection with the shell (1) and the inner wall of the tube plate (2), a second opening is formed in the lower baffle plate (5), and a steam flow channel is formed between the lower baffle plate (5) and the upper baffle plate (4);
a baffle plate (6), wherein a plurality of baffle plates (6) are arranged in a steam flow channel at least between a first opening of the upper baffle plate (4) and a second opening of the lower baffle plate (5);
a second heat exchange tube bundle (7) passing through a plurality of baffles (6) and fixed between two tube plates (2);
The baffle plates (6) are arranged in the steam flow channel between the first opening of the upper baffle plate (4) and the second opening of the lower baffle plate (5) in a manner perpendicular to the steam flow direction, and are staggered up and down along the steam flow direction;
The outlet is arranged at the top center of the shell (1), the first opening is arranged right below the outlet, and the second opening comprises two openings arranged at two ends of the lower baffle (5);
The first heat exchange tube bundle (3) and the second heat exchange tube bundle (7) are composed of a plurality of heat exchange tubes which are arranged in parallel, the number of the heat exchange tubes in the first heat exchange tube bundle (3) is larger than that of the heat exchange tubes in the second heat exchange tube bundle (7), and two ends of each heat exchange tube respectively extend out of the tube plates (2) on the corresponding sides;
The first heat exchange tube bundle (3) and the second heat exchange tube bundle (7) flow through a hot medium;
an intermediate medium is placed at the inner bottom of the shell (1), and the intermediate medium is liquid propane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010098715.0A CN111197943B (en) | 2020-02-18 | 2020-02-18 | Intermediate medium heat exchanger with overheating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010098715.0A CN111197943B (en) | 2020-02-18 | 2020-02-18 | Intermediate medium heat exchanger with overheating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111197943A CN111197943A (en) | 2020-05-26 |
| CN111197943B true CN111197943B (en) | 2024-06-21 |
Family
ID=70745266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010098715.0A Active CN111197943B (en) | 2020-02-18 | 2020-02-18 | Intermediate medium heat exchanger with overheating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111197943B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202993894U (en) * | 2012-12-21 | 2013-06-12 | 北京广厦环能科技有限公司 | Corrugated pipe vacuum condenser |
| CN203413992U (en) * | 2013-07-19 | 2014-01-29 | 烟台珈群高效节能设备有限公司 | Shell-and-plate heat exchanger capable of adapting to different mounting spaces |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2115129B (en) * | 1982-02-15 | 1984-10-31 | Shell Int Research | Process for the cooling of small particles-containing gases |
| DE3604288A1 (en) * | 1986-02-12 | 1987-08-13 | Uhde Gmbh | DEVICE AS A HEAT EXCHANGER, ESPECIALLY FOR COOLING PROCESS GAS OR FOR HEATING VAPOR |
| CN211651335U (en) * | 2020-02-18 | 2020-10-09 | 中海石油气电集团有限责任公司 | Intermediate medium heat exchanger with overheating device |
-
2020
- 2020-02-18 CN CN202010098715.0A patent/CN111197943B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202993894U (en) * | 2012-12-21 | 2013-06-12 | 北京广厦环能科技有限公司 | Corrugated pipe vacuum condenser |
| CN203413992U (en) * | 2013-07-19 | 2014-01-29 | 烟台珈群高效节能设备有限公司 | Shell-and-plate heat exchanger capable of adapting to different mounting spaces |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111197943A (en) | 2020-05-26 |
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