CN210441532U - Liquefied natural gas cold box precooling apparatus - Google Patents
Liquefied natural gas cold box precooling apparatus Download PDFInfo
- Publication number
- CN210441532U CN210441532U CN201920907359.5U CN201920907359U CN210441532U CN 210441532 U CN210441532 U CN 210441532U CN 201920907359 U CN201920907359 U CN 201920907359U CN 210441532 U CN210441532 U CN 210441532U
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- natural gas
- liquefaction
- gas
- heat exchange
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 41
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 167
- 239000003345 natural gas Substances 0.000 claims abstract description 83
- 239000007789 gas Substances 0.000 claims abstract description 52
- 239000007788 liquid Substances 0.000 claims description 44
- 239000004215 Carbon black (E152) Substances 0.000 claims description 30
- 229930195733 hydrocarbon Natural products 0.000 claims description 30
- 150000002430 hydrocarbons Chemical class 0.000 claims description 30
- 239000012535 impurity Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 3
- 238000003303 reheating Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000007791 liquid phase Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000007792 gaseous phase Substances 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
- F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
- F25J1/0247—Different modes, i.e. 'runs', of operation; Process control start-up of the process
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
- F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
- F25J1/0248—Stopping of the process, e.g. defrosting or deriming, maintenance; Back-up mode or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
- F25J2220/64—Separating heavy hydrocarbons, e.g. NGL, LPG, C4+ hydrocarbons or heavy condensates in general
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2245/00—Processes or apparatus involving steps for recycling of process streams
- F25J2245/02—Recycle of a stream in general, e.g. a by-pass stream
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model relates to a natural gas production technical field discloses a liquefied natural gas cold box precooling apparatus, including the cold box, be equipped with the liquefied natural gas flow path system and the unloading natural gas flow path system that communicate in proper order in the cold box, be equipped with liquefaction heat exchange assembly on the liquefied natural gas flow path system, be equipped with on the unloading natural gas flow path system and be used for carrying out the unloading gas heat exchange assembly of heat exchange with liquefaction heat exchange assembly, the liquefaction heat exchange assembly through liquefied natural gas flow path system carries out the heat exchange with the unloading gas heat exchange assembly on the unloading natural gas flow path system, make full use of normal atmospheric temperature natural gas and the characteristic of the natural gas both that have not been liquefied totally yet, practiced thrift the energy, improved the overall efficiency.
Description
Technical Field
The utility model relates to a liquefied natural gas production technical field, concretely relates to liquefied natural gas cold box precooling apparatus.
Background
The liquefied natural gas cold box is a heat exchange device used for realizing heat exchange between raw natural gas and a refrigerant in a liquefied natural gas device.
In the prior art, the liquefied natural gas cold box is started to cool, a natural gas product is not completely liquefied, a cold box product outlet pipeline needs to be continuously subjected to small-flow emptying treatment, and due to the fact that the temperature of the natural gas which is not completely liquefied is very low, the safety factor is considered, and an external heat source is needed to perform rewarming treatment in the process, and cold energy waste is caused.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem, the utility model provides a liquefied natural gas cold box precooling apparatus carries out the heat exchange with the unloading gas heat exchange assembly on the unloading natural gas flow path system through the liquefied heat exchange assembly of liquefied natural gas flow path system, make full use of normal atmospheric temperature natural gas and the characteristic by the natural gas both of complete liquefaction yet, practiced thrift the energy, improved the overall efficiency.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the utility model provides a liquefied natural gas cold box precooling apparatus, includes cold box body 9, this internal liquefied natural gas flow path system and the unloading natural gas flow path system that is equipped with the intercommunication of cold box, be equipped with the liquefaction heat exchange assembly on the liquefied natural gas flow path system, be equipped with the unloading gas heat exchange assembly that is used for carrying out the heat exchange with the liquefaction heat exchange assembly on the unloading natural gas flow path system.
Further, the liquefaction heat exchange assembly comprises a front liquefaction heat exchanger and a rear liquefaction heat exchanger which are sequentially communicated, the air-vent heat exchange assembly comprises a front air-vent heat exchanger and a rear air-vent heat exchanger which are sequentially communicated, the front air-vent heat exchanger is used for carrying out heat exchange with the rear liquefaction heat exchanger, and the rear air-vent heat exchanger is used for carrying out heat exchange with the front liquefaction heat exchanger.
Further, the liquefaction heat exchange assembly comprises a front liquefaction heat exchanger and a rear liquefaction heat exchanger which are sequentially communicated, the emptying gas heat exchange assembly is an emptying gas heat exchanger, and the emptying gas heat exchanger is used for exchanging heat with the front liquefaction heat exchanger and the rear liquefaction heat exchanger.
Further, be equipped with vapour and liquid separator between preceding liquefaction heat exchanger and the back liquefaction heat exchanger, vapour and liquid separator is arranged in the heavy hydrocarbon impurity of separation natural gas, preceding liquefaction heat exchanger, vapour and liquid separator and back liquefaction heat exchanger communicate in proper order.
Further, the gas-liquid separator is communicated with a low-temperature natural gas conveying pipeline, and the low-temperature natural gas conveying pipeline is communicated with the rear liquefaction heat exchanger.
Furthermore, one end, far away from the gas-liquid separator, of the rear liquefaction heat exchanger is communicated with a liquefaction conveying pipeline, the liquefaction conveying pipeline is communicated with a vent gas conveying pipeline, and one end, far away from the liquefaction conveying pipeline, of the vent gas conveying pipeline is communicated with a vent gas heat exchange assembly.
Further, the gas-liquid separator is communicated with a heavy hydrocarbon discharge pipeline, and the heavy hydrocarbon discharge pipeline is used for conveying heavy hydrocarbon impurities in the gas-liquid separator.
Furthermore, two ends of the front liquefaction heat exchanger are communicated with rewarming gas pipelines which are used for introducing hot gas or normal temperature gas.
Further, preceding liquefied heat exchanger is close to the first discharge pipe of vapour and liquid separator one end intercommunication, back liquefied heat exchanger is kept away from vapour and liquid separator one end intercommunication and is had the second discharge pipe, first discharge pipe and second discharge pipe are used for discharging the liquid heavy hydrocarbon or the liquid water that produce after reheating by the stifled cold box that freezes
Compared with the prior art, the utility model has the advantages that:
1. the liquefied natural gas cold box is opened for a period of time, the natural gas can not be completely liquefied, the natural gas which is not completely liquefied needs to be emptied, the temperature of the natural gas is very low at the moment, the natural gas can be directly discharged to cause personal injury and explosion danger, the natural gas with lower temperature can not be combusted by using a torch, and the natural gas needs to be heated by an external heat source, the utility model utilizes the liquefied heat exchange component of the liquefied natural gas flow path system to exchange heat with the emptying gas heat exchange component on the emptying natural gas flow path system, the normal temperature natural gas obtains the cold energy of the emptying natural gas, the required cold energy is reduced during the further liquefaction treatment, the energy is saved, the emptying natural gas obtains the heat energy of the normal temperature natural gas, the torch can be introduced for combustion after the temperature is raised, the external heat source is not needed, the existing resources are fully utilized, and the energy, the production benefit is improved.
2. If the stifled purpose is frozen in the emergence of liquefied natural gas cold box operation in-process, need shut down and carry out rewarming processing, liquefied natural gas heat exchanger both ends intercommunication has rewarming gas pipeline in the front, rewarming gas lets in rewarming gas pipeline and continues to flow through vapour and liquid separator, preceding liquefied heat exchanger and back liquefied heat exchanger, solid-state water or the heavy hydrocarbon that the production was frozen stifled become liquid or gaseous substance after rewarming is handled, through with the heavy hydrocarbon discharge pipeline, first discharge pipeline and second discharge pipeline discharge, can reach the purpose that the cold box was frozen stifled of quick elimination, and the production efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a lng cold box precooling apparatus includes a cold box body 9, a liquefied natural gas flow path system and a vent natural gas flow path system are provided in the cold box body, the liquefied natural gas flow path system is provided with a liquefied heat exchange assembly, the vent natural gas flow path system is provided with a vent gas heat exchange assembly for exchanging heat with the liquefied heat exchange assembly, the natural gas cannot be completely liquefied in a period after the lng cold box is opened, the natural gas which is not completely liquefied yet needs to be vented, the temperature of the natural gas at this time is very low, the direct discharge can cause personal injury and explosion hazard, the natural gas with lower temperature cannot be burned by a torch, and needs an external heat source to be heated, the utility model utilizes the liquefied heat exchange assembly of the liquefied natural gas flow path system to exchange heat with the vent gas heat exchange assembly on the vent natural gas flow path system, the normal temperature natural gas has obtained the cold energy of unloading natural gas, and when further liquefaction was handled, the cold energy that needs reduced, has practiced thrift the energy, and the unloading natural gas has obtained the heat energy of normal temperature natural gas, can let in the torch after the temperature promotes and burn, need not external heat source, make full use of current resource, practiced thrift the energy, improved the productivity effect.
As shown in fig. 1, the liquefaction heat exchange assembly comprises a front liquefaction heat exchanger 10 and a rear liquefaction heat exchanger 11 which are sequentially communicated, and the vent gas heat exchange assembly has two embodiments, wherein the first embodiment is as follows: the air-vent heat exchange assembly is an air-vent heat exchanger 8, and the air-vent heat exchanger is used for exchanging heat with a front liquefaction heat exchanger 10 and a rear liquefaction heat exchanger 11; the second embodiment is as follows: the air-release heat exchange assembly comprises a front air-release heat exchanger and a rear air-release heat exchanger which are sequentially communicated, the front air-release heat exchanger is used for exchanging heat with the rear liquefying heat exchanger, and the rear air-release heat exchanger is used for exchanging heat with the front liquefying heat exchanger.
As shown in fig. 1, a gas-liquid separator 4 is arranged between the front liquefaction heat exchanger 10 and the rear liquefaction heat exchanger 11, the gas-liquid separator is used for separating heavy hydrocarbon impurities in the natural gas, and the front liquefaction heat exchanger, the gas-liquid separator and the rear liquefaction heat exchanger are sequentially communicated; the gas-liquid separator 4 is communicated with a heavy hydrocarbon discharge pipeline 5, and the heavy hydrocarbon discharge pipeline is used for conveying heavy hydrocarbon impurities in the gas-liquid separator; preceding liquefied heat exchanger keeps away from vapour and liquid separator one end and uses even there is natural gas raw material pipeline 2, let in the normal atmospheric temperature natural gas in the natural gas raw material pipeline, the normal atmospheric temperature natural gas forms liquid phase heavy hydrocarbon and gaseous phase cryogenic natural gas behind the preceding liquefied heat exchanger, both enter behind the vapour and liquid separator, liquid phase heavy hydrocarbon is through 5 rows of discharges of heavy hydrocarbon delivery pipe, gaseous phase cryogenic natural gas carries to back liquefied heat exchanger 11 through low temperature natural gas pipeline 14, vapour and liquid separator can be with the heavy hydrocarbon separation of impurities in the natural gas discharge.
As shown in fig. 1, the gas-liquid separator is communicated with a low-temperature natural gas conveying pipeline 14, and the low-temperature natural gas conveying pipeline is communicated with the rear liquefaction heat exchanger 11; one end, far away from the gas-liquid separator, of the rear liquefaction heat exchanger is communicated with a liquefaction conveying pipeline 6, the liquefaction conveying pipeline is communicated with an air discharge conveying pipeline 7, one end, far away from the liquefaction conveying pipeline, of the air discharge conveying pipeline is communicated with an air discharge heat exchange assembly, when the equipment stably operates, low-temperature natural gas enters the rear liquefaction heat exchanger through the low-temperature natural gas conveying pipeline, and forms liquid-phase natural gas after passing through the rear liquefaction heat exchanger and is conveyed to the liquefaction conveying pipeline 6; the natural gas liquefaction temperature can not be reached when the equipment is just opened, the low-temperature natural gas further descends after passing through the rear liquefied heat exchanger 11 at the moment, but still is not liquefied, the liquefied conveying pipeline needs to be closed at the moment, the low-temperature natural gas is introduced into the emptying gas conveying pipeline 7, the temperature of the low-temperature natural gas at the moment is too low, if the low-temperature natural gas is directly introduced into a fuel system or a torch, the fuel system and the torch can be extinguished, the low-temperature natural gas is introduced into the emptying gas heat exchange assembly, the low-temperature natural gas exchanges heat with the liquefied heat exchange assembly through the emptying gas heat exchange assembly, the temperature of the low-temperature natural gas in the emptying gas heat exchange assembly can be increased due to the fact that the temperature of the normal-temperature natural.
As shown in fig. 1, two ends of the front liquefaction heat exchanger are communicated with a rewarming gas pipeline 1, and the rewarming gas pipeline is used for introducing thermal rewarming gas; one end of the front liquefied heat exchanger close to the gas-liquid separator 4 is communicated with a first discharge pipeline 13, one end of the rear liquefied heat exchanger far away from the gas-liquid separator is communicated with a second discharge pipeline 12, the first discharge pipeline 13 and the second discharge pipeline 12 are used for discharging heavy hydrocarbon or liquid water generated after reheating of the frozen and blocked cold box, if frozen and blocked occur in the operation process of the liquefied natural gas cold box, the machine needs to be stopped to eliminate the frozen and blocked, the two ends of the liquefaction heat exchanger are communicated with the rewarming gas pipeline, rewarming gas is introduced into the rewarming gas pipeline and then continuously flows through the front liquefaction heat exchanger, the gas-liquid separator and the rear liquefaction heat exchanger, solid water or heavy hydrocarbon which is frozen and blocked is produced to be changed into liquid or gaseous substances after rewarming treatment, and the solid water or the heavy hydrocarbon is discharged through the heavy hydrocarbon discharge pipeline, the first discharge pipeline and the second discharge pipeline, so that the purpose of quickly eliminating the freezing and blocking of the cold box can be achieved, and the production efficiency is improved.
The utility model discloses the theory of operation as follows: in a period of time after the equipment is started, normal temperature natural gas is introduced from the natural gas raw material pipeline 2, the normal temperature natural gas is introduced into the front liquefying heat exchanger 10 and the rear liquefying heat exchanger 11, the cold box is provided with a cold source which reduces the temperature of the natural gas in the front liquefied natural gas and the rear liquefied natural gas, but the natural gas is not enough to be liquefied, at the moment, the low-temperature natural gas enters the vent gas heat exchanger through the liquefaction conveying pipeline 6 and the vent gas conveying pipeline 7, the vent gas heat exchanger 8 can generate heat exchange with the front liquefaction heat exchanger 10 and the rear liquefaction heat exchanger 11, the front liquefaction heat exchanger and the rear liquefaction heat exchanger obtain cold energy, the vent gas heat exchanger obtains heat energy, the low-temperature natural gas in the vent gas heat exchanger is introduced into a fuel system or a torch after the temperature of the low-temperature natural gas is raised, the normal-temperature natural gas temperature of the front liquefaction heat exchanger is further reduced, energy is saved, and equipment benefits are improved; after the equipment stably runs, an emptying natural gas flow path system is closed, normal temperature natural gas enters a front liquefied heat exchanger through a natural gas raw material pipeline, the normal temperature natural gas is cooled in the front liquefied heat exchanger to form liquid phase heavy hydrocarbon and gas phase low temperature natural gas, the liquid phase heavy hydrocarbon is discharged through a heavy hydrocarbon discharge pipeline 5 after entering a gas-liquid separator, the gas phase low temperature natural gas is conveyed to a rear liquefied heat exchanger 11 through a low temperature natural gas conveying pipeline 14, the gas-liquid separator can separate and discharge heavy hydrocarbon impurities in the natural gas, the gas phase low temperature natural gas is cooled again in a rear liquefied heat exchanger to form liquefied natural gas, and the liquefied natural gas is conveyed to a liquefied conveying pipeline; produce when freezing stifled in the cold box, shut down equipment, let in normal atmospheric temperature gas or heated gas from rewarming gas pipeline 1, rewarming gas flow through preceding liquefied heat exchanger 10, vapour and liquid separator 4 and back liquefied heat exchanger 11, provide the heat for the cold box, it is stifled to eliminate freezing, freeze the liquid heavy hydrocarbon that forms after stifled elimination, liquid water can be through heavy hydrocarbon discharge pipe way 5, first discharge pipe way 13 and second discharge pipe way 12 discharge, freeze and start the operation again after stifled elimination.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The utility model provides a liquefied natural gas cold box precooling apparatus, includes cold box body (9), its characterized in that, this internal liquefied natural gas flow path system and the unloading natural gas flow path system that is equipped with the intercommunication of cold box, be equipped with liquefaction heat exchange assembly on the liquefied natural gas flow path system, be equipped with the unloading gas heat exchange assembly who is used for carrying out the heat exchange with liquefaction heat exchange assembly on the unloading natural gas flow path system.
2. The lng cold box precooling apparatus of claim 1, wherein: the liquefaction heat exchange assembly comprises a front liquefaction heat exchanger (10) and a rear liquefaction heat exchanger (11) which are sequentially communicated, the air-vent heat exchange assembly comprises a front air-vent heat exchanger and a rear air-vent heat exchanger which are sequentially communicated, the front air-vent heat exchanger is used for carrying out heat exchange with the rear liquefaction heat exchanger (11), and the rear air-vent heat exchanger is used for carrying out heat exchange with the front liquefaction heat exchanger (10).
3. The lng cold box precooling apparatus of claim 1, wherein: the liquefaction heat exchange assembly comprises a front liquefaction heat exchanger (10) and a rear liquefaction heat exchanger (11) which are sequentially communicated, the emptying gas heat exchange assembly is an emptying gas heat exchanger (8), and the emptying gas heat exchanger is used for exchanging heat with the front liquefaction heat exchanger (10) and the rear liquefaction heat exchanger (11).
4. The lng cold box precooling apparatus of claim 2 or claim 3, wherein: be equipped with vapour and liquid separator (4) between preceding liquefaction heat exchanger (10) and back liquefaction heat exchanger (11), vapour and liquid separator is arranged in the heavy hydrocarbon impurity of separation natural gas, preceding liquefaction heat exchanger, vapour and liquid separator and back liquefaction heat exchanger communicate in proper order.
5. The lng cold box precooling apparatus of claim 4, wherein: the gas-liquid separator is communicated with a low-temperature natural gas conveying pipeline (14), and the low-temperature natural gas conveying pipeline is communicated with the rear liquefaction heat exchanger (11).
6. The lng cold box precooling apparatus of claim 4, wherein: and one end, far away from the gas-liquid separator, of the rear liquefaction heat exchanger is communicated with a liquefaction conveying pipeline (6), the liquefaction conveying pipeline is communicated with a vent gas conveying pipeline (7), and one end, far away from the liquefaction conveying pipeline, of the vent gas conveying pipeline is communicated with a vent gas heat exchange assembly.
7. The lng cold box precooling apparatus of claim 4, wherein: and the gas-liquid separator (4) is communicated with a heavy hydrocarbon discharge pipeline (5), and the heavy hydrocarbon discharge pipeline is used for conveying heavy hydrocarbon impurities in the gas-liquid separator.
8. The lng cold box precooling apparatus of claim 2 or claim 3, wherein: two ends of the front liquefaction heat exchanger are communicated with a rewarming gas pipeline (1) which is used for introducing hot gas or normal temperature gas.
9. The lng cold box precooling apparatus of claim 4, wherein: preceding liquefied heat exchanger is close to first discharge pipe (13) of vapour and liquid separator (4) one end intercommunication, back liquefied heat exchanger is kept away from vapour and liquid separator one end intercommunication and is had second discharge pipe (12), first discharge pipe (13) and second discharge pipe (12) are used for discharging by the liquid heavy hydrocarbon or the liquid water that produce after reheating of the cold box that freezes stifled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920907359.5U CN210441532U (en) | 2019-06-17 | 2019-06-17 | Liquefied natural gas cold box precooling apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920907359.5U CN210441532U (en) | 2019-06-17 | 2019-06-17 | Liquefied natural gas cold box precooling apparatus |
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| Publication Number | Publication Date |
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| CN210441532U true CN210441532U (en) | 2020-05-01 |
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| CN201920907359.5U Active CN210441532U (en) | 2019-06-17 | 2019-06-17 | Liquefied natural gas cold box precooling apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230915A (en) * | 2019-06-17 | 2019-09-13 | 合肥万豪能源设备有限责任公司 | A kind of liquefied natural gas ice chest pre-cooler |
-
2019
- 2019-06-17 CN CN201920907359.5U patent/CN210441532U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230915A (en) * | 2019-06-17 | 2019-09-13 | 合肥万豪能源设备有限责任公司 | A kind of liquefied natural gas ice chest pre-cooler |
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