CN104329561B - A kind of system of liquid nitrogen LNG Liquefied natural gas and method thereof - Google Patents
A kind of system of liquid nitrogen LNG Liquefied natural gas and method thereof Download PDFInfo
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- CN104329561B CN104329561B CN201410607231.9A CN201410607231A CN104329561B CN 104329561 B CN104329561 B CN 104329561B CN 201410607231 A CN201410607231 A CN 201410607231A CN 104329561 B CN104329561 B CN 104329561B
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- 239000007788 liquid Substances 0.000 title claims abstract description 130
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 48
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 110
- 239000006200 vaporizer Substances 0.000 claims abstract description 52
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 19
- 238000009833 condensation Methods 0.000 claims description 18
- 230000005494 condensation Effects 0.000 claims description 18
- 230000030279 gene silencing Effects 0.000 claims description 13
- 239000003498 natural gas condensate Substances 0.000 claims description 9
- 238000010992 reflux Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000003345 natural gas Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Abstract
The invention discloses a kind of system and method thereof of liquid nitrogen LNG Liquefied natural gas.It comprises the first storage tank, the first vaporizer, the first valve, the 3rd valve, main heat exchanger, the 7th valve, the 4th valve, the second storage tank, the second valve, the second vaporizer, the 5th valve, the 6th valve, the 3rd storage tank; First storage tank first liquid outlet is connected with the first reservoir gas entrance through the first valve, the first vaporizer, first storage tank second liquid outlet is connected with main heat exchanger through the 3rd valve, second storage tank liquid outlet is connected with the second reservoir gas entrance through the second valve, the second vaporizer, second tank gas outlet is connected with the 3rd storage tank through main heat exchanger, the 4th valve, the 6th valve, second tank gas outlet is connected with the 7th valve, second storage tank indusion tube is connected with the 5th valve, is connected with the connecting tube of the 4th valve with the 6th valve simultaneously.The present invention's liquid nitrogen exchanges LNG Liquefied natural gas for, and avoids the wastes and pollution of boil-off gas discharge.
Description
Technical field
The present invention relates to energy field, particularly relate to a kind of system and method thereof of liquid nitrogen LNG Liquefied natural gas.
Background technique
Rock gas is the fastest a kind of energy of current whole world growth rate, and its development trend is rapid, will the progressively petroleum replacing energy.Under normal conditions, natural gas density is little, and volume is large, not easily shipping storage.Current shipping storage mode is mainly compressed natural gas and LNG Liquefied natural gas.Compared to compressed natural gas, LNG Liquefied natural gas can reach higher energy storage density, and volume is less, and efficiency of storage is higher.Along with LNG Liquefied natural gas increases in world's production capacity, demand and application increase, the demand also corresponding increase of liquefied natural gas (LNG) tank.
For liquefied natural gas (LNG) tank, leak heat and be difficult to stop completely, cause the liquid natural gas in storage tank to be evaporated again, the pressure in storage tank progressively rises, and then approaches the vessel strength limit and jeopardize safety.Existing processing mode for boil-off gas is directly drained in air, to reduce the pressure of storage tank.This way had both wasted high-quality natural gas energy resource, also had potential potential safety hazard.Liquid nitrogen is the by-product of air separating technological.Because the main purpose of air separation is for obtaining pure oxygen, liquid nitrogen is comparatively cheap as by-product price, possesses again lower temperature simultaneously, can provide cheap cold, thus become the excellent medium that cold energy of liquefied natural gas provides for the liquefaction of rock gas.
Summary of the invention
The object of the invention is the deficiency overcoming prior art flow process, a kind of system and method thereof of liquid nitrogen LNG Liquefied natural gas are provided.
A system for liquid nitrogen LNG Liquefied natural gas, comprises the first storage tank, the first vaporizer, the first valve, the 3rd valve, main heat exchanger, the 3rd storage tank, the 7th valve, the 4th valve, the second storage tank, the second valve, the second vaporizer, the 5th valve, the 6th valve; First storage tank first liquid outlet is connected with the first reservoir gas entrance through the first valve, the first vaporizer, first storage tank second liquid outlet is connected with main heat exchanger through the 3rd valve, second storage tank liquid outlet is connected with the second reservoir gas entrance through the second valve, the second vaporizer, second tank gas outlet is connected with the 3rd storage tank through main heat exchanger, the 4th valve, the 6th valve, second tank gas outlet is connected with the 7th valve, second storage tank indusion tube is connected with the 5th valve, is connected with the connecting tube of the 4th valve with the 6th valve simultaneously.
The system of described liquid nitrogen LNG Liquefied natural gas, also comprises rewarming heat exchanger, silencing apparatus; Described main heat exchanger, rewarming heat exchanger are connected successively with silencing apparatus.
The system of described liquid nitrogen LNG Liquefied natural gas, also comprises refrigerator, the 8th valve, the 4th storage tank, the 9th valve, the tenth valve, the 3rd vaporizer; Described main heat exchanger, refrigerator, the 8th valve, the 4th storage tank, the 9th valve are connected successively with described first liquid in storage tank entrance, and the 4th storage tank liquid outlet is connected with the 4th reservoir gas entrance through the tenth valve, the 3rd vaporizer.
A kind of liquid nitrogen Liquified Natural Gas Method, comprises the steps:
1), during the gas of condensation second storage tank, the first valve, the 3rd valve are opened, and the second valve, the 4th valve, the 5th valve, the 6th valve, the 7th valve are closed; The liquid of the first storage tank flows into the first vaporizer by the first valve and is evaporated to gas, flows into the gas zones of the first storage tank, and the pressure in the first storage tank is increased; The liquid pressurized of the first storage tank flows out from the 3rd valve, discharges after entering main heat exchanger heat exchange; Gas in second storage tank enters main heat exchanger, is condensed into liquid and flows back to the second storage tank after heat exchange;
2), during the gas of condensation the 3rd storage tank, the first valve, the 3rd valve, the 4th valve, the 6th valve are opened, and the second valve, the 5th valve, the 7th valve are closed; The liquid of the first storage tank flows into the first vaporizer by the first valve and is evaporated to gas, flows into the gas zones of the first storage tank, and the pressure in the first storage tank is increased; The liquid pressurized of the first storage tank flows out from the 3rd valve, discharges after entering main heat exchanger heat exchange; Gas in 3rd storage tank enters main heat exchanger through the 6th valve, the 4th valve, is condensed into liquid, flows into the second storage tank after heat exchange;
3), during natural gas condensates backflow operating mode, the first valve, the 3rd valve, the 4th valve, the 5th valve, the 7th valve are closed, and the second valve, the 6th valve are opened; Liquid in second storage tank enters the second vaporizer by the second valve and becomes gas and flow into the second storage tank again, makes the pressure increase in the second storage tank; Liquid pressurized in second storage tank flows into the 3rd storage tank through the 6th valve.
A kind of liquid nitrogen Liquified Natural Gas Method, comprises the steps:
1), during the gas of condensation second storage tank, the first valve, the 3rd valve are opened, and the second valve, the 4th valve, the 5th valve, the 6th valve, the 7th valve are closed; The liquid of the first storage tank flows into the first vaporizer by the first valve and is evaporated to gas, flows into the gas zones of the first storage tank, and the pressure in the first storage tank is increased; The liquid pressurized of the first storage tank flows out from the 3rd valve, discharges after entering main heat exchanger heat exchange through rewarming heat exchanger, silencing apparatus; Gas in second storage tank enters main heat exchanger, is condensed into liquid and flows back to the second storage tank after heat exchange;
2), during the gas of condensation the 3rd storage tank, the first valve, the 3rd valve, the 4th valve, the 6th valve are opened, and the second valve, the 5th valve, the 7th valve are closed; The liquid of the first storage tank flows into the first vaporizer by the first valve and is evaporated to gas, flows into the gas zones of the first storage tank, and the pressure in the first storage tank is increased; The liquid pressurized of the first storage tank flows out from the 3rd valve, enters main heat exchanger heat exchange, then is discharged by rewarming heat exchanger, silencing apparatus successively; Gas in 3rd storage tank enters main heat exchanger through the 6th valve, the 4th valve, is condensed into liquid, flows into the second storage tank after heat exchange;
3), during natural gas condensates backflow operating mode, the first valve, the 3rd valve, the 4th valve, the 5th valve, the 7th valve are closed, and the second valve, the 6th valve are opened; Liquid in second storage tank enters the second vaporizer by the second valve and becomes gas and flow into the second storage tank again, makes the pressure increase in the second storage tank; Liquid pressurized in second storage tank flows into the 3rd storage tank through the 6th valve.
A kind of liquid nitrogen Liquified Natural Gas Method, comprises the steps:
1), during the gas of condensation second storage tank, the first valve, the 3rd valve, the 8th valve are opened, and the second valve, the 4th valve, the 5th valve, the 6th valve, the 7th valve, the 9th valve, the tenth valve are closed; The liquid of the first storage tank flows into the first vaporizer by the first valve and is evaporated to gas, flows into the gas zones of the first storage tank, and the pressure in the first storage tank is increased; The liquid pressurized of the first storage tank flows out from the 3rd valve, enters by cryocooled after main heat exchanger heat exchange, flows into the 4th storage tank through the 8th valve; Gas in second storage tank enters main heat exchanger, is condensed into liquid and flows back to the second storage tank after heat exchange;
2), during the gas of condensation the 3rd storage tank, the first valve, the 3rd valve, the 4th valve, the 6th valve, the 8th valve are opened, and the second valve, the 5th valve, the 7th valve, the 9th valve, the tenth valve are closed; The liquid of the first storage tank flows into the first vaporizer by the first valve and is evaporated to gas, flows into the gas zones of the first storage tank, and the pressure in the first storage tank is increased; The liquid pressurized of the first storage tank flows out from the 3rd valve, enters by cryocooled after main heat exchanger heat exchange, flows into the 4th storage tank through the 8th valve; Gas in 3rd storage tank enters main heat exchanger through the 6th valve, the 4th valve, is condensed into liquid, flows into the second storage tank after heat exchange;
3), during natural gas condensates backflow operating mode, the first valve, the 3rd valve, the 4th valve, the 5th valve, the 7th valve are closed, and the second valve, the 6th valve are opened; Liquid in second storage tank enters the second vaporizer by the second valve and becomes gas and flow into the second storage tank again, makes the pressure increase in the second storage tank; Liquid pressurized in second storage tank flows into the 3rd storage tank through the 6th valve;
4), during liquid nitrogen reflux operating mode, the first valve, the 3rd valve, the 8th valve are closed, and the 9th valve, the tenth valve are opened; Liquid in 4th storage tank enters the 3rd vaporizer by the tenth valve and becomes gas and flow into the 4th storage tank again, makes the pressure increase in the 4th storage tank; Liquid pressurized in 4th storage tank flows into the first storage tank through the 9th valve.
The present invention, for liquefying the boil-off gas reclaimed in natural gas storage tank, utilizes comparatively cheap liquid nitrogen to exchange high quality energy gas for, avoids energy waste and environmental pollution that boil-off gas directly discharges simultaneously.
Accompanying drawing explanation
Fig. 1 is liquid nitrogen LNG Liquefied natural gas system architecture schematic diagram;
Fig. 2 is the liquid nitrogen LNG Liquefied natural gas system architecture schematic diagram of band rewarming heat exchanger and silencing apparatus;
Fig. 3 is the system architecture schematic diagram that refrigerator reclaims the liquid nitrogen LNG Liquefied natural gas of liquid nitrogen.
Embodiment
As shown in Figure 1, a system for liquid nitrogen LNG Liquefied natural gas, comprises the first storage tank 1, first vaporizer 2, first valve 3, the 3rd valve 4, main heat exchanger 5, the 3rd storage tank 6, the 7th valve 7, the 4th valve 8, second storage tank 9, second valve 10, second vaporizer 11, the 5th valve 12, the 6th valve 13; First storage tank 1 first liquid outlet is connected with the first storage tank 1 gas access through the first valve 3, first vaporizer 2, first storage tank 1 second liquid outlet is connected with main heat exchanger 5 through the 3rd valve 4, second storage tank 9 liquid outlet is connected with the second storage tank 9 gas access through the second valve 10, second vaporizer 11, second storage tank 9 gas outlet is connected with the 3rd storage tank 6 through main heat exchanger 5, the 4th valve 8, the 6th valve 13, second storage tank 9 gas outlet is connected with the 7th valve 7, second storage tank 9 indusion tube is connected with the 5th valve 12, is connected with the connecting tube of the 4th valve 8 with the 6th valve 13 simultaneously.
A kind of liquid nitrogen Liquified Natural Gas Method, comprises the steps:
1), during the gas of condensation second storage tank 9, the first valve 3, the 3rd valve 4 are opened, and the second valve 10, the 4th valve 8, the 5th valve 12, the 6th valve 13, the 7th valve 7 are closed; The liquid of the first storage tank 1 flows into the first vaporizer 2 by the first valve 3 and is evaporated to gas, flows into the gas zones of the first storage tank 1, and the pressure in the first storage tank 1 is increased; The liquid pressurized of the first storage tank 1 flows out from the 3rd valve 4, discharges after entering main heat exchanger 5 heat exchange; Gas in second storage tank 9 enters main heat exchanger 5, is condensed into liquid and flows back to the second storage tank 9 after heat exchange;
2), during the gas of condensation the 3rd storage tank 6, the first valve 3, the 3rd valve 4, the 4th valve 8, the 6th valve 13 are opened, and the second valve 10, the 5th valve 12, the 7th valve 7 are closed; The liquid of the first storage tank 1 flows into the first vaporizer 2 by the first valve 3 and is evaporated to gas, flows into the gas zones of the first storage tank 1, and the pressure in the first storage tank 1 is increased; The liquid pressurized of the first storage tank 1 flows out from the 3rd valve 4, discharges after entering main heat exchanger 5 heat exchange; Gas in 3rd storage tank 6 enters main heat exchanger 5 through the 6th valve 13, the 4th valve 8, is condensed into liquid after heat exchange, flows into the second storage tank 9;
3), during natural gas condensates backflow operating mode, the first valve 3, the 3rd valve 4, the 4th valve 8, the 5th valve 12, the 7th valve 7 are closed, and the second valve 10, the 6th valve 13 are opened; Liquid in second storage tank 9 enters the second vaporizer 11 by the second valve 10 and becomes gas and flow into the second storage tank 9 again, makes the pressure increase in the second storage tank 9; Liquid pressurized in second storage tank 9 flows into the 3rd storage tank 6 through the 6th valve 13.
As shown in Figure 2, a kind of system of liquid nitrogen LNG Liquefied natural gas, also comprises rewarming heat exchanger 14, silencing apparatus 15; Described main heat exchanger 5, rewarming heat exchanger 14 are connected successively with silencing apparatus 15.
A kind of liquid nitrogen Liquified Natural Gas Method, comprises the steps:
1), during the gas of condensation second storage tank 9, the first valve 3, the 3rd valve 4 are opened, and the second valve 10, the 4th valve 8, the 5th valve 12, the 6th valve 13, the 7th valve 7 are closed; The liquid of the first storage tank 1 flows into the first vaporizer 2 by the first valve 3 and is evaporated to gas, flows into the gas zones of the first storage tank 1, and the pressure in the first storage tank 1 is increased; The liquid pressurized of the first storage tank 1 flows out from the 3rd valve 4, discharges after entering main heat exchanger 5 heat exchange through rewarming heat exchanger 14, silencing apparatus 15; Gas in second storage tank 9 enters main heat exchanger 5, is condensed into liquid and flows back to the second storage tank 9 after heat exchange;
2), during the gas of condensation the 3rd storage tank 6, the first valve 3, the 3rd valve 4, the 4th valve 8, the 6th valve 13 are opened, and the second valve 10, the 5th valve 12, the 7th valve 7 are closed; The liquid of the first storage tank 1 flows into the first vaporizer 2 by the first valve 3 and is evaporated to gas, flows into the gas zones of the first storage tank 1, and the pressure in the first storage tank 1 is increased; The liquid pressurized of the first storage tank 1 flows out from the 3rd valve 4, enters main heat exchanger 5 heat exchange, then is discharged by rewarming heat exchanger 14, silencing apparatus 15 successively; Gas in 3rd storage tank 6 enters main heat exchanger 5 through the 6th valve 13, the 4th valve 8, is condensed into liquid after heat exchange, flows into the second storage tank 9;
3), during natural gas condensates backflow operating mode, the first valve 3, the 3rd valve 4, the 4th valve 8, the 5th valve 12, the 7th valve 7 are closed, and the second valve 10, the 6th valve 13 are opened; Liquid in second storage tank 9 enters the second vaporizer 11 by the second valve 10 and becomes gas and flow into the second storage tank 9 again, makes the pressure increase in the second storage tank 9; Liquid pressurized in second storage tank 9 flows into the 3rd storage tank 6 through the 6th valve 13.
As shown in Figure 3, a kind of system of liquid nitrogen LNG Liquefied natural gas, also comprises refrigerator 16, the 8th valve 17, the 4th storage tank 18, the 9th valve 19, the tenth valve 20, the 3rd vaporizer 21; Described main heat exchanger 5, refrigerator 16, the 8th valve 17, the 4th storage tank 18, the 9th valve 19 are connected successively with described first storage tank 1 liquid inlet, and the 4th storage tank 18 liquid outlet is connected with the 4th storage tank 18 gas access through the tenth valve 20, the 3rd vaporizer 21.
A kind of liquid nitrogen Liquified Natural Gas Method, comprises the steps:
1), during the gas of condensation second storage tank 9, the first valve 3, the 3rd valve 4, the 8th valve 17 are opened, and the second valve 10, the 4th valve 8, the 5th valve 12, the 6th valve 13, the 7th valve 7, the 9th valve 19, the tenth valve 20 are closed; The liquid of the first storage tank 1 flows into the first vaporizer 2 by the first valve 3 and is evaporated to gas, flows into the gas zones of the first storage tank 1, and the pressure in the first storage tank 1 is increased; The liquid pressurized of the first storage tank 1 flows out from the 3rd valve 4, is cooled after entering main heat exchanger 5 heat exchange by refrigerator 16, flows into the 4th storage tank 18 through the 8th valve 17; Gas in second storage tank 9 enters main heat exchanger 5, is condensed into liquid and flows back to the second storage tank 9 after heat exchange;
2), during the gas of condensation the 3rd storage tank 6, the first valve 3, the 3rd valve 4, the 4th valve 8, the 6th valve 13, the 8th valve 17 are opened, and the second valve 10, the 5th valve 12, the 7th valve 7, the 9th valve 19, the tenth valve 20 are closed; The liquid of the first storage tank 1 flows into the first vaporizer 2 by the first valve 3 and is evaporated to gas, flows into the gas zones of the first storage tank 1, and the pressure in the first storage tank 1 is increased; The liquid pressurized of the first storage tank 1 flows out from the 3rd valve 4, is cooled after entering main heat exchanger 5 heat exchange by refrigerator 16, flows into the 4th storage tank 18 through the 8th valve 17; Gas in 3rd storage tank 6 enters main heat exchanger 5 through the 6th valve 13, the 4th valve 8, is condensed into liquid after heat exchange, flows into the second storage tank 9;
3), during natural gas condensates backflow operating mode, the first valve 3, the 3rd valve 4, the 4th valve 8, the 5th valve 12, the 7th valve 7 are closed, and the second valve 10, the 6th valve 13 are opened; Liquid in second storage tank 9 enters the second vaporizer 11 by the second valve 10 and becomes gas and flow into the second storage tank 9 again, makes the pressure increase in the second storage tank 9; Liquid pressurized in second storage tank 9 flows into the 3rd storage tank 6 through the 6th valve 13;
4) during liquid nitrogen reflux operating mode, the first valve 3, the 3rd valve 4, the 8th valve 17 are closed, and the 9th valve 19, the tenth valve 20 are opened; Liquid in 4th storage tank 18 enters the 3rd vaporizer 21 by the tenth valve 20 and becomes gas and flow into the 4th storage tank 18 again, makes the pressure increase in the 4th storage tank 18; Liquid pressurized in 4th storage tank 18 flows into the first storage tank 1 through the 9th valve 19.
Claims (6)
1. a system for liquid nitrogen LNG Liquefied natural gas, is characterized in that comprising the first storage tank (1), the first vaporizer (2), the first valve (3), the 3rd valve (4), main heat exchanger (5), the 3rd storage tank (6), the 7th valve (7), the 4th valve (8), the second storage tank (9), the second valve (10), the second vaporizer (11), the 5th valve (12), the 6th valve (13), first storage tank (1) first liquid outlet is through the first valve (3), first vaporizer (2) is connected with the first storage tank (1) gas access, first storage tank (1) second liquid outlet is connected with main heat exchanger (5) through the 3rd valve (4), second storage tank (9) liquid outlet is through the second valve (10), second vaporizer (11) is connected with the second storage tank (9) gas access, second storage tank (9) gas outlet is through main heat exchanger (5), 4th valve (8), 6th valve (13) is connected with the 3rd storage tank (6), second storage tank (9) gas outlet is connected with the 7th valve (7), second storage tank (9) indusion tube is connected with the 5th valve (12), be connected with the connecting tube of the 4th valve (8) with the 6th valve (13) simultaneously.
2. the system of a kind of liquid nitrogen LNG Liquefied natural gas according to claim 1, characterized by further comprising rewarming heat exchanger (14), silencing apparatus (15); Described main heat exchanger (5), rewarming heat exchanger (14) are connected successively with silencing apparatus (15).
3. the system of a kind of liquid nitrogen LNG Liquefied natural gas according to claim 1, characterized by further comprising refrigerator (16), the 8th valve (17), the 4th storage tank (18), the 9th valve (19), the tenth valve (20), the 3rd vaporizer (21); Described main heat exchanger (5), refrigerator (16), the 8th valve (17), the 4th storage tank (18), the 9th valve (19) are connected successively with described first storage tank (1) liquid inlet, and the 4th storage tank (18) liquid outlet is connected with the 4th storage tank (18) gas access through the tenth valve (20), the 3rd vaporizer (21).
4. use a liquid nitrogen Liquified Natural Gas Method for system described in claim 1, it is characterized in that comprising the steps:
1), during the gas of condensation second storage tank (9), the first valve (3), the 3rd valve (4) are opened, and the second valve (10), the 4th valve (8), the 5th valve (12), the 6th valve (13), the 7th valve (7) are closed; The liquid of the first storage tank (1) flows into the first vaporizer (2) by the first valve (3) and is evaporated to gas, flows into the gas zones of the first storage tank (1), the pressure in the first storage tank (1) is increased; The liquid pressurized of the first storage tank (1) flows out from the 3rd valve (4), discharges after entering main heat exchanger (5) heat exchange; Gas in second storage tank (9) enters main heat exchanger (5), is condensed into liquid and flows back to the second storage tank (9) after heat exchange;
2), during the gas of condensation the 3rd storage tank (6), the first valve (3), the 3rd valve (4), the 4th valve (8), the 6th valve (13) are opened, and the second valve (10), the 5th valve (12), the 7th valve (7) are closed; The liquid of the first storage tank (1) flows into the first vaporizer (2) by the first valve (3) and is evaporated to gas, flows into the gas zones of the first storage tank (1), the pressure in the first storage tank (1) is increased; The liquid pressurized of the first storage tank (1) flows out from the 3rd valve (4), discharges after entering main heat exchanger (5) heat exchange; Gas in 3rd storage tank (6) enters main heat exchanger (5) through the 6th valve (13), the 4th valve (8), is condensed into liquid, flows into the second storage tank (9) after heat exchange;
3), during natural gas condensates backflow operating mode, the first valve (3), the 3rd valve (4), the 4th valve (8), the 5th valve (12), the 7th valve (7) are closed, and the second valve (10), the 6th valve (13) are opened; Liquid in second storage tank (9) enters the second vaporizer (11) by the second valve (10) and becomes gas and flow into the second storage tank (9) again, makes the pressure increase in the second storage tank (9); Liquid pressurized in second storage tank (9) flows into the 3rd storage tank (6) through the 6th valve (13).
5. use a liquid nitrogen Liquified Natural Gas Method for system described in claim 1 or 2, it is characterized in that comprising the steps:
1), during the gas of condensation second storage tank (9), the first valve (3), the 3rd valve (4) are opened, and the second valve (10), the 4th valve (8), the 5th valve (12), the 6th valve (13), the 7th valve (7) are closed; The liquid of the first storage tank (1) flows into the first vaporizer (2) by the first valve (3) and is evaporated to gas, flows into the gas zones of the first storage tank (1), the pressure in the first storage tank (1) is increased; The liquid pressurized of the first storage tank (1) flows out from the 3rd valve (4), discharges after entering main heat exchanger (5) heat exchange through rewarming heat exchanger (14), silencing apparatus (15); Gas in second storage tank (9) enters main heat exchanger (5), is condensed into liquid and flows back to the second storage tank (9) after heat exchange;
2), during the gas of condensation the 3rd storage tank (6), the first valve (3), the 3rd valve (4), the 4th valve (8), the 6th valve (13) are opened, and the second valve (10), the 5th valve (12), the 7th valve (7) are closed; The liquid of the first storage tank (1) flows into the first vaporizer (2) by the first valve (3) and is evaporated to gas, flows into the gas zones of the first storage tank (1), the pressure in the first storage tank (1) is increased; The liquid pressurized of the first storage tank (1) flows out from the 3rd valve (4), enters main heat exchanger (5) heat exchange, then is discharged by rewarming heat exchanger (14), silencing apparatus (15) successively; Gas in 3rd storage tank (6) enters main heat exchanger (5) through the 6th valve (13), the 4th valve (8), is condensed into liquid, flows into the second storage tank (9) after heat exchange;
3), during natural gas condensates backflow operating mode, the first valve (3), the 3rd valve (4), the 4th valve (8), the 5th valve (12), the 7th valve (7) are closed, and the second valve (10), the 6th valve (13) are opened; Liquid in second storage tank (9) enters the second vaporizer (11) by the second valve (10) and becomes gas and flow into the second storage tank (9) again, makes the pressure increase in the second storage tank (9); Liquid pressurized in second storage tank (9) flows into the 3rd storage tank (6) through the 6th valve (13).
6. use a liquid nitrogen Liquified Natural Gas Method for system described in claim 1 or 3, it is characterized in that comprising the steps:
1) during the gas of condensation second storage tank (9), first valve (3), the 3rd valve (4), the 8th valve (17) are opened, and the second valve (10), the 4th valve (8), the 5th valve (12), the 6th valve (13), the 7th valve (7), the 9th valve (19), the tenth valve (20) are closed; The liquid of the first storage tank (1) flows into the first vaporizer (2) by the first valve (3) and is evaporated to gas, flows into the gas zones of the first storage tank (1), the pressure in the first storage tank (1) is increased; The liquid pressurized of the first storage tank (1) flows out from the 3rd valve (4), is cooled, flow into the 4th storage tank (18) through the 8th valve (17) after entering main heat exchanger (5) heat exchange by refrigerator (16); Gas in second storage tank (9) enters main heat exchanger (5), is condensed into liquid and flows back to the second storage tank (9) after heat exchange;
2) during the gas of condensation the 3rd storage tank (6), first valve (3), the 3rd valve (4), the 4th valve (8), the 6th valve (13), the 8th valve (17) are opened, and the second valve (10), the 5th valve (12), the 7th valve (7), the 9th valve (19), the tenth valve (20) are closed; The liquid of the first storage tank (1) flows into the first vaporizer (2) by the first valve (3) and is evaporated to gas, flows into the gas zones of the first storage tank (1), the pressure in the first storage tank (1) is increased; The liquid pressurized of the first storage tank (1) flows out from the 3rd valve (4), is cooled, flow into the 4th storage tank (18) through the 8th valve (17) after entering main heat exchanger (5) heat exchange by refrigerator (16); Gas in 3rd storage tank (6) enters main heat exchanger (5) through the 6th valve (13), the 4th valve (8), is condensed into liquid, flows into the second storage tank (9) after heat exchange;
3), during natural gas condensates backflow operating mode, the first valve (3), the 3rd valve (4), the 4th valve (8), the 5th valve (12), the 7th valve (7) are closed, and the second valve (10), the 6th valve (13) are opened; Liquid in second storage tank (9) enters the second vaporizer (11) by the second valve (10) and becomes gas and flow into the second storage tank (9) again, makes the pressure increase in the second storage tank (9); Liquid pressurized in second storage tank (9) flows into the 3rd storage tank (6) through the 6th valve (13);
4), during liquid nitrogen reflux operating mode, the first valve (3), the 3rd valve (4), the 8th valve (17) are closed, and the 9th valve (19), the tenth valve (20) are opened; Liquid in 4th storage tank (18) enters the 3rd vaporizer (21) by the tenth valve (20) and becomes gas and flow into the 4th storage tank (18) again, makes the pressure increase in the 4th storage tank (18); Liquid pressurized in 4th storage tank (18) flows into the first storage tank (1) through the 9th valve (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410607231.9A CN104329561B (en) | 2014-11-03 | 2014-11-03 | A kind of system of liquid nitrogen LNG Liquefied natural gas and method thereof |
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| CN115507619A (en) * | 2022-10-18 | 2022-12-23 | 江苏克劳特低温技术有限公司 | A device for producing high-purity methane by rectification with two towers |
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| JP2003106498A (en) * | 2001-09-28 | 2003-04-09 | Toho Gas Co Ltd | LNG tank BOG reliquefaction recovery system |
| CN101233361A (en) * | 2005-07-06 | 2008-07-30 | 普莱克斯技术有限公司 | Cryogenic tank system |
| CN201964142U (en) * | 2011-01-24 | 2011-09-07 | 成都深冷科技有限公司 | LNG (liquefied natural gas) pump-free aeration equipment with function of BOG (boil off gas) recovery |
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| CN204227028U (en) * | 2014-11-03 | 2015-03-25 | 江苏克劳特低温技术有限公司 | A kind of system of liquid nitrogen LNG Liquefied natural gas |
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| JP5148319B2 (en) * | 2008-02-27 | 2013-02-20 | 三菱重工業株式会社 | Liquefied gas reliquefaction apparatus, liquefied gas storage equipment and liquefied gas carrier equipped with the same, and liquefied gas reliquefaction method |
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| JP2003106498A (en) * | 2001-09-28 | 2003-04-09 | Toho Gas Co Ltd | LNG tank BOG reliquefaction recovery system |
| CN101233361A (en) * | 2005-07-06 | 2008-07-30 | 普莱克斯技术有限公司 | Cryogenic tank system |
| CN201964142U (en) * | 2011-01-24 | 2011-09-07 | 成都深冷科技有限公司 | LNG (liquefied natural gas) pump-free aeration equipment with function of BOG (boil off gas) recovery |
| CN104061431A (en) * | 2014-04-03 | 2014-09-24 | 查特深冷工程系统(常州)有限公司 | Modularized BOG (Boil Off Gas) re-liquefaction system of low-temperature liquid storage tank |
| CN204227028U (en) * | 2014-11-03 | 2015-03-25 | 江苏克劳特低温技术有限公司 | A kind of system of liquid nitrogen LNG Liquefied natural gas |
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