CN220437201U - A high-efficient heat exchanger for gasifying LNG - Google Patents
A high-efficient heat exchanger for gasifying LNG Download PDFInfo
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- CN220437201U CN220437201U CN202322114818.3U CN202322114818U CN220437201U CN 220437201 U CN220437201 U CN 220437201U CN 202322114818 U CN202322114818 U CN 202322114818U CN 220437201 U CN220437201 U CN 220437201U
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- heat exchanger
- heat
- tube side
- lng
- inlet
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 36
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 11
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 230000008016 vaporization Effects 0.000 claims description 9
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000001294 propane Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 239000002609 medium Substances 0.000 claims 2
- 239000012913 medium supplement Substances 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000010992 reflux Methods 0.000 abstract description 2
- 239000003949 liquefied natural gas Substances 0.000 description 30
- 239000007788 liquid Substances 0.000 description 9
- 230000001502 supplementing effect Effects 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The present utility model provides a high efficiency heat exchanger for gasifying LNG, comprising: the shell passes of the first heat exchanger, the second heat exchanger and the shell of the third heat exchanger are communicated through a plurality of steel pipe support connections; the third heat exchanger is provided with a steam inlet and a condensate outlet which are respectively communicated with a tube side inlet and a tube side outlet of the third heat exchanger; the second heat exchanger is provided with an LNG inlet and a gaseous NG outlet which are respectively communicated with a tube side inlet and a tube side outlet of the second heat exchanger; the first heat exchanger is provided with a gaseous NG inlet and a gaseous NG final outlet which are respectively communicated with a tube side inlet and a tube side outlet of the first heat exchanger. According to the utility model, the shell passes of the adjacent heat exchangers are communicated through the steel pipes, the heat exchange with the LNG is realized by utilizing the property of heating up the intermediate heat medium and cooling and refluxing, the LNG is gasified and heated to be above the dew point through twice heat exchange, the forced circulation of the intermediate heat medium by the circulating pump is omitted, the efficiency of the heat exchanger is improved, and the energy consumption is reduced.
Description
Technical Field
The utility model relates to the technical field of heat exchangers, in particular to a high-efficiency heat exchanger for gasifying LNG.
Background
LNG is liquefied natural gas, and in LNG processes, LNG in a liquid state is gasified by a gasifier.
Take an intermediate fluid gasifier as an example: the steam is used as a heat source, and the heat source is used to heat and vaporize the intermediate medium (methanol), and then the methanol vapor is used to vaporize the LNG. If a shell-and-tube gasifier is used, then: the initial heat source is hot water, sea water or air, the intermediate heat medium is water or methanol (or glycol) water solution, the intermediate heat medium is heated by the initial heat source, and then the heated intermediate heat medium is used for de-gasifying LNG through the shell-and-tube gasifier.
In the prior art, three gasifiers are used for gasifying LNG, the first one is to heat an intermediate heat medium by an initial heat source, the second one and the third one are to gasify LNG by the heated intermediate heat medium, wherein the intermediate heat medium is forced to circulate by a circulating pump, and the technology is widely applied to the fields of offshore floating storage and gasification, circulating heating, cold energy power generation and the like.
The defects are that: the forced circulation of the intermediate heating medium by the circulating pump brings higher energy consumption, which is unfavorable for energy conservation and environmental protection, so that the prior art needs to be improved.
Disclosure of Invention
The present utility model provides a high efficiency heat exchanger for vaporizing LNG to solve the above problems.
The utility model adopts a technical scheme that: provided is a high efficiency heat exchanger for gasifying LNG, comprising: the shell passes of the first heat exchanger, the second heat exchanger and the shell of the third heat exchanger are communicated through a plurality of steel pipe support connections;
the third heat exchanger is provided with a steam inlet and a condensate outlet which are respectively communicated with a tube side inlet and a tube side outlet, an initial heat source is arranged in the tube side, and an intermediate heat medium is arranged in the shell side;
the second heat exchanger is provided with an LNG inlet and a gaseous NG outlet which are respectively communicated with a tube side inlet and a tube side outlet of the second heat exchanger;
the first heat exchanger is provided with a gaseous NG inlet and a gaseous NG final outlet which are respectively communicated with a tube side inlet and a tube side outlet of the first heat exchanger;
the gaseous NG outlet is communicated with the gaseous NG inlet through an outer tube;
when the heat exchange device is used, an initial heat source enters the tube pass of the third heat exchanger from the steam inlet to heat the intermediate heat medium in the shell pass, the intermediate heat medium is gasified and then enters the shell passes of the second heat exchanger and the first heat exchanger through the steel tubes to heat LNG and gaseous NG in the tube pass, and after heat exchange, the intermediate heat medium is cooled into liquid to flow back to the shell pass of the third heat exchanger, and the liquid flows back and forth in a circulating way, so that the intermediate heat medium does not need to be forced to circulate by a circulating pump, and the heat exchange device is low in energy consumption, energy-saving and environment-friendly.
Further, an exhaust port is further formed in the first heat exchanger, and internal pressure is exhausted through the exhaust port when equipment is shut down for overhauling.
Furthermore, an intermediate heat medium supplementing port is further arranged on the third heat exchanger, and the intermediate heat medium is supplemented through the intermediate heat medium supplementing port when the intermediate heat medium is lost after the equipment is stopped and overhauled.
Further, the bottom of the third heat exchanger is provided with a saddle, and the saddle can be fixed to the ground through foundation bolts.
Further, the outer circumferential surface of the shell of the third heat exchanger is also provided with a reinforcing ring corresponding to the saddle, and two ends of the reinforcing ring are welded with the saddle to improve the structural strength.
Further, a plurality of connecting holes are formed in the shells of the first heat exchanger, the second heat exchanger and the third heat exchanger, and each steel pipe is inserted into the corresponding connecting hole and welded and fixed.
Further, the steel pipes are thick-wall steel pipes and are used for supporting the heat exchanger above.
Further, the initial heat source is one of high pressure hot water, superheated steam and saturated steam, and the intermediate heat medium is one of methanol, ethylene glycol and propane.
Further, the pressure of the initial heat source introduced into the tube side of the third heat exchanger is 1.5-1.7Mpa, and the temperature is 185-225 ℃.
The efficient heat exchanger for gasifying LNG has the beneficial effects that:
1. the heat exchanger structure that stacks from top to bottom is designed, through the shell side of steel pipe intercommunication adjacent heat exchanger, utilizes the middle heat medium to be heated to rise, and the nature of cooling backward flow realizes the heat transfer with LNG, gasifies LNG through twice heat transfer and heats to above the dew point, has omitted the forced circulation of circulating pump to middle heat medium, makes heat exchanger efficiency improve, and the energy consumption reduces, and is more energy-concerving and environment-protective.
Drawings
FIG. 1 is a front view of a high efficiency heat exchanger for vaporizing LNG in accordance with a first embodiment of the present utility model;
FIG. 2 is a side view of a high efficiency heat exchanger for vaporizing LNG in accordance with a first embodiment of the present utility model;
the components in the drawings are marked as follows: 1. the device comprises a first heat exchanger, 2, a second heat exchanger, 3, a third heat exchanger, 4, a steel pipe, 5, a saddle, 11, a gaseous NG inlet, 12, a gaseous NG final outlet, 13, an exhaust port, 21, an LNG inlet, 22, a gaseous NG outlet, 31, a steam inlet, 32, a condensate outlet, 33 and an intermediate heating medium supplementing port.
Detailed Description
The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present utility model.
In the description of the present utility model, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "horizontal," "vertical," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present utility model, and do not indicate or imply that the components or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
Referring to fig. 1 and 2, a first embodiment of the present utility model provides a high efficiency heat exchanger for gasifying LNG, comprising: the first heat exchanger 1, the second heat exchanger 2 and the third heat exchanger 3 are sequentially stacked from top to bottom, the shells of the first heat exchanger 1, the second heat exchanger 2 and the third heat exchanger 3 are in supporting connection through a plurality of steel pipes 4, shell passes of the shells are communicated, and the three heat exchangers are of a horizontal structure;
the third heat exchanger 3 is provided with a steam inlet 31 and a condensate outlet 32 which are respectively communicated with a tube side inlet and a tube side outlet, an initial heat source is arranged in the tube side, and an intermediate heat medium is arranged in the shell side;
the second heat exchanger 2 is provided with an LNG inlet 21 and a gaseous NG outlet 22 which are respectively communicated with a tube side inlet and a tube side outlet of the second heat exchanger;
the first heat exchanger 1 is provided with a gaseous NG inlet 11 and a gaseous NG final outlet 12 which are respectively communicated with a tube side inlet and a tube side outlet of the first heat exchanger;
the gaseous NG outlet 22 is communicated with the gaseous NG inlet 11 through an outer pipe, LNG is gasified after heat exchange in the second heat exchanger 2, and then enters the first heat exchanger 1 to exchange heat and continuously heat.
Specifically, the bottom of the third heat exchanger 3 is provided with a saddle 5, and the third heat exchanger 3 can be fixed to the ground through foundation bolts, and a reinforcing ring corresponding to the saddle 5 is further arranged on the outer circumferential surface of the shell of the third heat exchanger 3, and two ends of the reinforcing ring are welded with the saddle 5 to improve structural strength.
In order to ensure stable structure, the saddle 5 needs to be subjected to calculation with concentrated load, calculation with wind load and seismic load, calculation with stability and calculation with local stress on the cylinder body, and calculation to determine the setting positions of the saddle 5 and the steel pipe 4.
Specifically, a plurality of connecting holes are formed in the shells of the first heat exchanger 1, the second heat exchanger 2 and the third heat exchanger 3, each steel pipe 4 is inserted into the corresponding connecting hole and welded and fixed, and the steel pipes 4 are thick-wall steel pipes 4 and are used for supporting the heat exchanger above.
In order to ensure that the temperature of the gaseous NG can reach the standard after twice heat exchange, the outer tube is also coated with a heat insulation material, so that heat loss is reduced.
The first heat exchanger 1 is also provided with an exhaust port 13, and the internal pressure is exhausted through the exhaust port 13 when the equipment is shut down for maintenance;
the third heat exchanger 3 is also provided with an intermediate heat medium supplementing port 33, and the intermediate heat medium supplementing port 33 supplements the intermediate heat medium when the intermediate heat medium is lost after the equipment is stopped and overhauled.
Specifically, the shell ends of the third heat exchanger 3 and the second heat exchanger 2 are respectively provided with a liquid level meter lower valve and a liquid level meter upper valve for judging the internal liquid level condition, and the bottom of the third heat exchanger 3 is also provided with a liquid outlet for discharging an intermediate heat source.
The first heat exchanger 1 is also provided with a pressure transmitter, a pressure gauge and a thermometer, the pressure transmitter supplies measured pressure data to corresponding alarm and recording instruments, the pressure gauge and the thermometer display internal pressure and temperature, and whether the gaseous NG is heated to be above the dew point is judged;
the second heat exchanger 2 is also provided with a tube side safety valve connected with a tube side and a shell side safety valve connected with a shell side, and is used for guaranteeing operation.
When the heat exchange device is used, an initial heat source enters the tube pass of the third heat exchanger 3 from the steam inlet 31, the intermediate heat medium in the shell pass is heated, the intermediate heat medium is gasified and then enters the shell passes of the second heat exchanger 2 and the first heat exchanger 1 through the steel tube 4, LNG and gaseous NG in the tube pass are heated, after heat exchange, the intermediate heat medium is cooled into liquid which flows back to the shell pass of the third heat exchanger 3, and the liquid is circulated and reciprocated, so that a circulating pump is not required to perform forced circulation on the intermediate heat medium, and the heat exchange device is low in energy consumption, energy-saving and environment-friendly.
The initial heat source can be any one of high-pressure hot water, superheated steam and saturated steam, the pressure range of the initial heat source introduced into the tube side of the third heat exchanger 3 is 1.5-1.7Mpa, and the temperature range is 185-225 ℃.
The intermediate heating medium may be any one of methanol, ethylene glycol and propane.
When methanol is used as an intermediate heating medium, the boiling point of the methanol is 64.8 ℃, the methanol is heated to be more than 64.8 ℃ in the third heat exchanger 3 and evaporated, the methanol is sent to the second and first heat exchangers 1 through the steel pipes 4, then the methanol exchanges heat with LNG and gaseous NG in the second and first heat exchangers 1, and the methanol is condensed and reflowed after the temperature is reduced.
In the second embodiment of the utility model, only two heat exchangers are used for superposition, the rest of the design is the same as that of the first embodiment, and the intermediate heat medium can enter the second heat exchanger along the steel pipe after being heated and evaporated and exchange heat with LNG to gasify the LNG, but the temperature of gaseous NG is lower, the temperature can not meet the use requirement, dew can be formed on the outer surface of equipment or a pipeline at the use end, and the factory requirement is not met.
The efficient heat exchanger for gasifying LNG has the beneficial effects that:
1. the heat exchanger structure which is vertically stacked is designed, the shell passes of the adjacent heat exchangers are communicated through the steel pipes, the heat exchange with LNG is realized by utilizing the property of heating and rising of the middle heat medium and cooling and refluxing, LNG is gasified and heated to be above the dew point through twice heat exchange, the forced circulation of the middle heat medium by a circulating pump is omitted, the efficiency of the heat exchanger is improved, the energy consumption is reduced, and the heat exchanger is more energy-saving and environment-friendly;
2. the middle heating medium supplementing port is arranged, so that after the equipment is stopped and overhauled, the middle heating medium lost in overhauling can be supplemented through the middle heating medium supplementing port;
3. the saddle is arranged at the bottom of the third heat exchanger, and the reinforcing ring corresponding to the saddle is further arranged on the outer circumferential surface of the shell of the third heat exchanger, so that the structural strength is improved, and the equipment stability is ensured. The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.
Claims (10)
1. A high efficiency heat exchanger for vaporizing LNG comprising: the shell passes of the first heat exchanger, the second heat exchanger and the shell of the third heat exchanger are communicated through a plurality of steel pipe support connections;
the third heat exchanger is provided with a steam inlet and a condensate outlet which are respectively communicated with a tube side inlet and a tube side outlet, an initial heat source is arranged in the tube side, and an intermediate heat medium is arranged in the shell side;
the second heat exchanger is provided with an LNG inlet and a gaseous NG outlet which are respectively communicated with a tube side inlet and a tube side outlet of the second heat exchanger;
the first heat exchanger is provided with a gaseous NG inlet and a gaseous NG final outlet which are respectively communicated with a tube side inlet and a tube side outlet of the first heat exchanger;
the gaseous NG outlet communicates with the gaseous NG inlet through an outer tube.
2. A high efficiency heat exchanger for vaporizing LNG as defined in claim 1, wherein said first heat exchanger is further provided with a vent.
3. A high efficiency heat exchanger for vaporizing LNG according to claim 2 wherein the third heat exchanger is further provided with an intermediate heat medium supplement port.
4. A high efficiency heat exchanger for gasifying LNG according to any one of claims 1-3, characterized in that the bottom of the third heat exchanger is provided with a saddle.
5. The efficient heat exchanger for gasifying LNG according to claim 4, wherein reinforcing rings corresponding to the saddles are further provided on an outer circumferential surface of the shell of the third heat exchanger, and both ends of the reinforcing rings are welded to the saddles.
6. The efficient heat exchanger for gasifying LNG according to any one of claims 1 to 3, wherein a plurality of connecting holes are formed in the shells of the first heat exchanger, the second heat exchanger and the third heat exchanger, and each steel pipe is inserted into a corresponding connecting hole and welded and fixed.
7. A high efficiency heat exchanger for vaporizing LNG as defined in claim 6 wherein said steel tubes are thick walled steel tubes.
8. A high efficiency heat exchanger for vaporizing LNG according to any of claims 1-3 wherein the initial heat source is one of high pressure hot water, superheated steam and saturated steam and the intermediate heat medium is one of methanol, ethylene glycol and propane.
9. A high efficiency heat exchanger for vaporizing LNG according to claim 8 wherein the initial heat source introduced into the third heat exchanger tube pass has a pressure of 1.5 to 1.7Mpa and a temperature of 185 to 225 ℃.
10. The efficient heat exchanger for gasifying LNG according to claim 9, wherein a saddle is provided at a bottom of the third heat exchanger, and reinforcing rings corresponding to the saddle are further provided on an outer circumferential surface of the housing of the third heat exchanger, and both ends of the reinforcing rings are welded to the saddle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322114818.3U CN220437201U (en) | 2023-08-08 | 2023-08-08 | A high-efficient heat exchanger for gasifying LNG |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322114818.3U CN220437201U (en) | 2023-08-08 | 2023-08-08 | A high-efficient heat exchanger for gasifying LNG |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220437201U true CN220437201U (en) | 2024-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322114818.3U Active CN220437201U (en) | 2023-08-08 | 2023-08-08 | A high-efficient heat exchanger for gasifying LNG |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220437201U (en) |
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2023
- 2023-08-08 CN CN202322114818.3U patent/CN220437201U/en active Active
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