CN114370599A - Pre-cooling BOG re-condensation system of LNG receiving station - Google Patents
Pre-cooling BOG re-condensation system of LNG receiving station Download PDFInfo
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- CN114370599A CN114370599A CN202111564817.8A CN202111564817A CN114370599A CN 114370599 A CN114370599 A CN 114370599A CN 202111564817 A CN202111564817 A CN 202111564817A CN 114370599 A CN114370599 A CN 114370599A
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- 238000009833 condensation Methods 0.000 title claims abstract description 13
- 238000001816 cooling Methods 0.000 title abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 36
- 230000005494 condensation Effects 0.000 claims abstract description 9
- 239000006200 vaporizer Substances 0.000 claims description 8
- 239000013535 sea water Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 24
- 230000008569 process Effects 0.000 abstract description 23
- 238000005265 energy consumption Methods 0.000 abstract description 20
- 239000003949 liquefied natural gas Substances 0.000 description 104
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000007792 gaseous phase Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
- F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a pre-cooling type BOG re-condensing system of an LNG receiving station, which comprises: an LNG storage tank; the LNG storage tank comprises an LNG unloading arm connected with the LNG storage tank, a BOG buffer tank, a condensation strand LNG connected with the LNG storage tank through a pipeline, and a bypass LNG; the compressor is connected with the BOG buffer tank; the heat exchanger is connected with the compressor, and the gasifier is connected with the heat exchanger; a recondenser is connected between the heat exchanger and the gasifier. After the heat exchanger is added between the compressor and the recondenser, the BOG before recondensation can be precooled by utilizing part of high-pressure pump outlet low-temperature LNG while fully utilizing the cold energy of the LNG receiving station, namely, a precooling type BOG recondensing process is adopted, and the energy consumption of the system is effectively reduced when the BOG treatment capacity is the same.
Description
Technical Field
The invention relates to the technical field of energy, in particular to a precooling type BOG recondensing system of an LNG receiving station.
Background
Natural Gas is one of the subject energy sources of modern clean energy systems in China, the proportion of Natural Gas in disposable energy consumption is gradually increased, and the number of Liquefied Natural Gas (LNG, Natural Gas) storage tanks in China is also continuously increased. As LNG receiving stations are built and operated, problems in the operation of the BOG processing system in the receiving station also occur one by one. The terminal gas users facing the LNG receiving station are urban residents, industrial plants, power plants and the like, and the magnitude of the gas consumption of the users directly determines the magnitude of the output flow of the LNG receiving station. However, the gas consumption of these end users is constantly changing in different gas consumption periods every day and in different gas consumption seasons every year, so that the LNG flow output from the receiving station fluctuates every moment. The amount of flash steam (Boil Off Gas, BOG, flash steam) generated in the LNG receiving station is influenced by various factors, the fluctuation of the generated amount is large, and the BOG amount can be several times that of the BOG not unloaded during the ship unloading operation, so that the operating condition of the BOG processing system of the receiving station is always changed. If the BOG is not properly treated, the LNG storage tank is in danger due to overpressure, and the resource waste is caused by discharging the torch. The rising and ever-increasing market competition for LNG trade prices places demands on LNG receiving station equipment and BOG recovery process operations to reduce energy consumption.
For the energy type LNG receiving station, a re-condensing process (i.e., a BOG re-condensing process) is commonly used at receiving stations at home and abroad. After the output LNG flow is pumped out from the LNG storage tank, the output LNG flow is divided into two paths: one path of LNG is used as recondensed LNG to enter a recondensor to be condensed BOG, and the other path of LNG is used as bypass LNG to be directly connected to an inlet of the high-pressure pump. BOG and recondensation LNG are after less pressure boost, and the direct mixing contact heat transfer of entering recondensor utilizes the cold volume of the LNG of certain super-cooled rate after the pressure boost to totally liquefy BOG, and LNG after the liquefaction gets into the high-pressure pump pressure boost with bypass LNG together, and the export after getting into regasifier gasification. The compressor is an important device influencing the energy consumption of the receiving station, and the operation parameters of the compressor have great influence on the operation of the BOG recondensing system, so that the energy consumption of the system is large.
Thus, there is a need for improvements and enhancements in the art.
Disclosure of Invention
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a BOG recondensing system for an LNG receiving station, wherein the system comprises: an LNG storage tank; the LNG storage tank comprises an LNG unloading arm connected with the LNG storage tank, a BOG buffer tank, a condensation strand LNG connected with the LNG storage tank through a pipeline, and a bypass LNG; the compressor is connected with the BOG buffer tank; the heat exchanger is connected with the compressor, and the gasifier is connected with the heat exchanger; a recondenser is connected between the heat exchanger and the gasifier.
In one implementation, the bypass LNG is connected to a high-pressure pump, the high-pressure pump is connected to the heat exchanger through a first electromagnetic three-way valve, and the high-pressure pump is connected to the vaporizer through a second electromagnetic three-way valve.
In one implementation, a third electromagnetic three-way valve is disposed between the bypass LNG and the high-pressure pump, and the bypass LNG, the high-pressure pump, and the recondenser are respectively connected to the third electromagnetic three-way valve.
In one implementation, the condensing strand LNG is coupled to the recondenser.
In one implementation, the condensing-strand LNG and the bypass LNG are connected by a fourth electromagnetic three-way valve.
In one implementation, the LNG storage tank and the BOG buffer tank are connected by a fifth electromagnetic three-way valve.
In one implementation, a low pressure pump is disposed within the LNG storage tank.
In one implementation, the discharge temperature of the compressor is between-45 ℃ and-10 ℃.
In one implementation, the high pressure pump outlet temperature is less than-125 ℃.
In one implementation, the gasifier is connected to a seawater pump.
Has the advantages that: compared with the prior art, the invention provides a precooling type BOG recondensing system of an LNG receiving station, which comprises: an LNG storage tank; the LNG storage tank comprises an LNG unloading arm connected with the LNG storage tank, a BOG buffer tank, a condensation strand LNG connected with the LNG storage tank through a pipeline, and a bypass LNG; the compressor is connected with the BOG buffer tank; the heat exchanger is connected with the compressor, and the gasifier is connected with the heat exchanger; a recondenser is connected between the heat exchanger and the gasifier. After the heat exchanger is added between the compressor and the recondenser, the BOG before recondensation can be precooled by utilizing part of high-pressure pump outlet low-temperature LNG while fully utilizing the cold energy of the LNG receiving station, namely, a precooling type BOG recondensing process is adopted, and the energy consumption of the system is effectively reduced when the BOG treatment capacity is the same.
Drawings
Fig. 1 is a schematic diagram of a pre-cooled BOG recondensing system for an LNG receiving station according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present embodiment provides a BOG recondensing system for an LNG receiving station, as shown in fig. 1, comprising: an LNG storage tank; the LNG storage tank comprises an LNG unloading arm connected with the LNG storage tank, a BOG buffer tank, a condensation strand LNG connected with the LNG storage tank through a pipeline, and a bypass LNG; the compressor is connected with the BOG buffer tank; the heat exchanger is connected with the compressor, and the gasifier is connected with the heat exchanger; a recondenser is connected between the heat exchanger and the gasifier. After the heat exchanger is added between the compressor and the recondenser, the BOG before entering recondensation can be precooled by utilizing part of high-pressure pump outlet low-temperature LNG while the cold energy of the LNG receiving station is fully utilized, namely, a precooling type BOG recondensing process is adopted, and the energy consumption of the system is effectively reduced when the BOG treatment capacity is the same.
Specifically, as shown in fig. 1, a low-pressure pump is provided in the LNG storage tank in the present embodiment. This LNG energy storage tank is provided with three interface, and one of them interface is unloaded the arm with LNG and is linked, and the second interface is drawn forth from the low-pressure pump to be connected with the LNG storage tank, the third interface is connected with fifth electromagnetism three-way valve, and this fifth electromagnetism three-way valve is connected with the BOG buffer tank. Further, in this embodiment, the bypass LNG is connected to a high-pressure pump, the high-pressure pump is connected to the heat exchanger through a first electromagnetic three-way valve, and the high-pressure pump is connected to the vaporizer through a second electromagnetic three-way valve. A third electromagnetic three-way valve is provided between the bypass LNG and the high-pressure pump, the bypass LNG, the high-pressure pump, and the recondenser are connected to the third electromagnetic three-way valve, respectively, and the condensed-stream LNG is connected to the recondenser. And the condensing-strand LNG is connected with the bypass LNG through the fourth electromagnetic three-way valve.
Specifically, referring to fig. 1, in the present embodiment, the pipeline from which the low-pressure pump is led to be connected to the LNG tank is connected to the bypass LNG through an electromagnetic three-way valve (which is a sixth electromagnetic three-way valve), and the other end of the bypass LNG is connected to the inlet of the high-pressure pump through a third electromagnetic three-way valve. The BOG buffer tank is connected with the compressor, and the recondenser is provided with two inlets, wherein one inlet is connected with the compressor, and the other inlet is connected with the condensation strand LNG. The recondenser has two outlets, one of which is connected to a third electromagnetic three-way valve between the bypass LNG and the high pressure pump. As can be seen from fig. 1, the outlet of the high-pressure pump of this embodiment is connected to the vaporizer through the first electromagnetic three-way valve and the second electromagnetic three-way valve, respectively, and the vaporizer is connected to the seawater pump. And a second electromagnetic three-way valve between the high-pressure pump and the gasifier is connected with the heat exchanger, and further connected with an inlet of the compressor. The first electromagnetic three-way valve is connected with an outlet of the heat exchanger. In this embodiment, the low-temperature LNG at the outlet of the high-pressure pump precools the BOG at the inlet of the recondenser, and the precooled LNG is mixed with another low-temperature LNG at the outlet of the high-pressure pump and then enters the vaporizer. The exhaust temperature of the compressor is maintained within the range of minus 45 ℃ to minus 10 ℃, the LNG temperature at the outlet of the high-pressure pump is generally lower than minus 125 ℃, the temperature difference between the compressor and the LNG is large, and the compressor has sufficient heat exchange conditions. If the outlet pressure of the compressor is reduced from 750kPa to 500kPa, the total energy consumption of the receiving station is reduced by 10.15 percent, and when the temperature of the inlet recondensor is reduced by 60 ℃, the reduction range of the total energy consumption reaches 20.79 percent.
In this embodiment, the temperature of the BOG before entering the recondenser is cooled to-100 ℃ after heat exchange cooling in the recondensing process with pre-cooling set, and the lower the temperature of the BOG entering the recondenser, the lower the minimum output required for stable operation of the receiving station. The minimum export required for the LNG receiving station is 62.26t/h when the temperature into the recondenser is-100 c. There was a pressure drop of 10kPa in the heat exchanger. To further illustrate the effect of this embodiment, the compressor efficiency is 80%, and other parameters are kept consistent, comparing the pre-cooling BOG recondensing process of this embodiment with the original BOG recondensing system process.
The calculation results of the main process parameters of the original re-condensing process and the pre-cooling BOG re-condensing process are shown in table 1 when the original re-condensing process and the pre-cooling BOG re-condensing process are operated at respective minimum output under the condition that the BOG treatment capacity is the same.
TABLE 1
The re-condensing process and the pre-cooling BOG re-condensing process have the advantages that when the BOG treatment capacity is the same, the flow rate, the bypass flow rate, the minimum external transportation amount and the mass ratio of a condensing strand LNG of the pre-cooling BOG re-condensing process are all smaller than those of an original re-condensing process. This is because in the pre-cooled recondensing scheme, the BOG inlet temperature of the recondenser is reduced from-40 ℃ to-100 ℃, and the mass flow of condensed-stream LNG required to condense the same mass of BOG is reduced from 60.3t/h to 50.22 t/h. The BOG mass flow is unchanged and the mass ratio is reduced from 7.893 to 6.574. The recondenser outlet LNG temperature is lower so that less bypass flow is required than in the original BOG recondensing process to ensure that the high pressure pump does not cavitate. The reduction limit of the mass flow of the LNG in the condensation strand and the bypass flow of the recondenser reduces the minimum output which meets the requirement of stable operation of the receiving station. The minimum output is reduced from 73.265t/h to 62.26t/h, and the minimum output is reduced by 15.02%.
The outlet pressure of the compressor of the original re-condensing process and the outlet pressure of the compressor of the pre-cooling re-condensing process are the same and are both 550 kPa, so that the energy consumption of the compressors of the two processes is the same and is both 378.1 kW. However, due to the reduction of the output flow of the LNG flowing out of the storage tank and the output flow of the receiving station, the energy consumption of the low-pressure pump, the high-pressure pump and the seawater pump is reduced, and the total energy consumption of the system is also reduced. Wherein the energy consumption of the low-pressure pump is reduced by 16.75 percent. The output flow is reduced, under the condition that the pressure and temperature conditions of the inlet and the outlet are almost unchanged, the energy consumption of the high-pressure pump is reduced by 15.03%, the heat exchange amount of the gasifier is reduced, the seawater flow required to be provided by the seawater pump to the gasifier is reduced, and the energy consumption of the seawater pump is reduced by 16.76%. The total energy consumption of the pre-cooling type re-condensation process is 809.5kW, and the energy consumption is saved by 8.7 percent compared with 886.6kW of the original re-condensation process.
Therefore, after the liquid cargo enters the LNG storage tank through the LNG discharging arm, the LNG is compressed and cooled by the low-pressure pump and then is divided into two paths, and one path of the LNG is sent to the upper part of the recondenser to condense BOG; the other path is mixed with condensate below the condenser through a compressor. BOG that the storage tank and the unloading in-process produced and BOG that trades the line and leak the heat production buffer memory in the buffer tank and separate the lime set, gaseous phase BOG reentrants the compressor and carries out the pressure boost processing, and BOG after the pressure boost carries out the heat transfer with the subcooling LNG through the low-pressure pump pressure boost in the recondensor, and at last all condensation, later mix with the LNG of recondensor lower part, carry to the vaporizer gasification after the high-pressure pump pressure boost to pipe network pressure, input pipe network. In the embodiment, the exhaust temperature of the BOG compressor is maintained within the range of-45 to-10 ℃, the LNG temperature at the outlet of the high-pressure pump is generally lower than-125 ℃, the temperature difference between the two is large, and sufficient heat exchange conditions are provided. If the outlet pressure of the compressor is reduced from 750kPa to 500kPa, the total energy consumption of the receiving station is reduced by 10.15 percent, and when the temperature of the inlet recondensor is reduced by 60 ℃, the reduction range of the total energy consumption reaches 20.79 percent. To ensure proper operating pressure of the recondenser, the compressor outlet pressure cannot be too low, while cavitation of the high pressure pump is to be prevented.
In summary, the present invention discloses a pre-cooling BOG recondensing system for an LNG receiving station, the system comprising: an LNG storage tank; the LNG storage tank comprises an LNG unloading arm connected with the LNG storage tank, a BOG buffer tank, a condensation strand LNG connected with the LNG storage tank through a pipeline, and a bypass LNG; the compressor is connected with the BOG buffer tank; the heat exchanger is connected with the compressor, and the gasifier is connected with the heat exchanger; a recondenser is connected between the heat exchanger and the gasifier. After the heat exchanger is added between the compressor and the recondenser, the BOG before recondensation can be precooled by utilizing part of high-pressure pump outlet low-temperature LNG while fully utilizing the cold energy of the LNG receiving station, namely, a precooling type BOG recondensing process is adopted, and the energy consumption of the system is effectively reduced when the BOG treatment capacity is the same.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A LNG receiving station pre-cooled BOG recondensing system, the system comprising: an LNG storage tank; the LNG storage tank comprises an LNG unloading arm connected with the LNG storage tank, a BOG buffer tank, a condensation strand LNG connected with the LNG storage tank through a pipeline, and a bypass LNG; the compressor is connected with the BOG buffer tank; the heat exchanger is connected with the compressor, and the gasifier is connected with the heat exchanger; a recondenser is connected between the heat exchanger and the gasifier.
2. The pre-cooled BOG recondensing system of claim 1, wherein the bypass LNG is connected to a high pressure pump, the high pressure pump being connected to the heat exchanger by a first electromagnetic three-way valve, the high pressure pump being connected to the vaporizer by a second electromagnetic three-way valve.
3. The LNG receiving station pre-cooled BOG recondensing system of claim 2, wherein a third electromagnetic three-way valve is disposed between the bypass LNG and the high pressure pump, and the bypass LNG, the high pressure pump, and the recondenser are respectively connected to the third electromagnetic three-way valve.
4. The LNG receiving station pre-cooled BOG recondensing system of claim 3, wherein the condensed stream of LNG is coupled to the recondenser.
5. The pre-cooled BOG recondensing system of an LNG receiving station according to claim 4, wherein the condensed stream LNG and the bypass LNG are connected by a fourth electromagnetic three-way valve.
6. The pre-cooled BOG recondensing system of an LNG receiving station according to claim 5, wherein the LNG storage tank and the BOG buffer tank are connected by a fifth electromagnetic three-way valve.
7. The pre-cooled BOG recondensing system of an LNG receiving station according to claim 6, wherein a low pressure pump is provided within the LNG storage tank.
8. The pre-cooled BOG recondensing system of an LNG receiving station according to claim 7, wherein the discharge temperature of the compressor is-45 to-10 ℃.
9. The pre-cooled BOG recondensing system of claim 8, wherein the high pressure pump outlet temperature is below-125 ℃.
10. The pre-cooled BOG recondensing system of an LNG receiving station according to claim 9, wherein a seawater pump is connected to the vaporizer.
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| CN202111564817.8A CN114370599B (en) | 2021-12-20 | 2021-12-20 | LNG receiving station precooling type BOG recondensing system |
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| EP3540195A1 (en) * | 2018-03-16 | 2019-09-18 | Hamilton Sundstrand Corporation | Rankine cycle powered by bleed heat |
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-
2021
- 2021-12-20 CN CN202111564817.8A patent/CN114370599B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000146430A (en) * | 1998-11-13 | 2000-05-26 | Osaka Gas Co Ltd | Method for reliquefying bog utilizing lng |
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