CN219995055U - Liquefied natural gas storage tank pressure stabilizing and consumption reducing device - Google Patents
Liquefied natural gas storage tank pressure stabilizing and consumption reducing device Download PDFInfo
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- CN219995055U CN219995055U CN202320444719.9U CN202320444719U CN219995055U CN 219995055 U CN219995055 U CN 219995055U CN 202320444719 U CN202320444719 U CN 202320444719U CN 219995055 U CN219995055 U CN 219995055U
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- storage tank
- natural gas
- low
- gas storage
- heat exchange
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 36
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 112
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 98
- 239000003345 natural gas Substances 0.000 claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 51
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 49
- 239000007789 gas Substances 0.000 claims abstract description 24
- 239000012071 phase Substances 0.000 claims abstract description 19
- 239000007791 liquid phase Substances 0.000 claims abstract description 15
- 239000006200 vaporizer Substances 0.000 claims description 6
- 239000003507 refrigerant Substances 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 4
- 239000012080 ambient air Substances 0.000 description 3
- 239000003570 air Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model discloses a pressure stabilizing and consumption reducing device for a liquefied natural gas storage tank, which comprises a natural gas storage tank, a low-temperature heat exchange container, a low-temperature liquid nitrogen storage tank and a PLC (programmable logic controller), wherein the bottom of the natural gas storage tank is connected with the low-temperature heat exchange container through a liquid phase pneumatic valve, the bottom of the low-temperature heat exchange container is connected with the natural gas storage tank through a immersed pump and a gas phase pneumatic valve, and the bottom of the low-temperature liquid nitrogen storage tank is connected with a coil pipe in the low-temperature heat exchange container through a liquid nitrogen pneumatic valve and a plunger pump; and the natural gas storage tank and the low-temperature heat exchange container are both provided with pressure transmitting devices. The device of the utility model uses low-temperature liquid nitrogen as a refrigerant to liquefy the gas natural gas, thereby reducing the working pressure of the liquefied natural gas storage tank and simultaneously reducing the natural gas loss.
Description
Technical Field
The utility model belongs to the technical field of gas storage, and particularly relates to a pressure stabilizing and consumption reducing device for a liquefied natural gas storage tank.
Background
When the liquefied natural gas filling station fills the vehicle-mounted Dewar tank (LNG), the liquefied natural gas needs to be returned to the top of the storage tank through a gas phase pipeline, when Compressed Natural Gas (CNG) is filled, a gas returning device is also arranged on the low-temperature plunger pump, gas phase which flows back into the natural gas storage tank is heated due to the fact that the temperature of the gas phase is increased due to the fact that the energy of the external environment is absorbed, the pressure of the natural gas low-temperature storage tank is increased, even the working pressure is exceeded, the pressure of the storage tank is reduced by opening a discharge valve for discharging in order to ensure that the storage tank safely operates, and loss is generated.
Disclosure of Invention
The utility model aims to: the utility model aims to solve the defects in the prior art and provides a pressure stabilizing and consumption reducing device for a liquefied natural gas storage tank.
The technical scheme is as follows: the utility model relates to a pressure stabilizing and consumption reducing device for a liquefied natural gas storage tank, which comprises a natural gas storage tank, a low-temperature heat exchange container, a low-temperature liquid nitrogen storage tank and a PLC (programmable logic controller), wherein the bottom of the natural gas storage tank is connected with the low-temperature heat exchange container through a liquid phase pneumatic valve, the bottom of the low-temperature heat exchange container is connected with the natural gas storage tank through a immersed pump and a gas phase pneumatic valve, and the bottom of the low-temperature liquid nitrogen storage tank is connected with a coil pipe in the low-temperature heat exchange container through a liquid nitrogen pneumatic valve and a plunger pump; and the natural gas storage tank and the low-temperature heat exchange container are respectively provided with a pressure transmitting device, and the liquid phase pneumatic valve, the gas phase pneumatic valve, the liquid nitrogen pneumatic valve, the plunger pump and the pressure transmitting devices are all connected with the PLC.
In some embodiments, the natural gas storage tank top is connected with a blow-down manual valve and a safety valve through a pipeline, and the blow-down manual valve is connected with a blow-down pipe.
In some embodiments, the natural gas storage tank top connection is equipped with a storage tank pressure transmitter; and the top of the low-temperature heat exchange container is connected with a heat exchange container pressure transmitter which is respectively used for monitoring the pressure values in the natural gas storage tank and the low-temperature heat exchange container.
In some embodiments, the gas phase pneumatic valve is connected to a spherical sprayer at the top of the natural gas storage tank. When the pressure of the natural gas storage tank reaches 1.1MPa, the temperature of liquefied natural gas steam is-121 ℃, a storage tank pressure transmitter transmits a signal to a PLC controller, the controller instructs to start the immersed pump to operate, the liquefied natural gas with lower temperature enters a spherical sprayer arranged at the top of the natural gas storage tank through a gas phase pneumatic valve and is sprayed out of the sprayer, and the pressure value in the natural gas storage tank is reduced.
In some embodiments, one end of the coil is connected with the plunger pump, and the other end is connected with a plurality of nitrogen cylinders through a nitrogen high-pressure vaporizer. The low-temperature liquid nitrogen flows out of the low-temperature coil pipe, absorbs heat in ambient air through the air temperature type vaporizer, is vaporized into normal-temperature nitrogen, and then enters the gas cylinder to be filled.
In some embodiments, a differential pressure type liquid level gauge is mounted on the low temperature heat exchange container, and the differential pressure type liquid level gauge is connected with the PLC. When the liquid level of the low-temperature heat exchange container reaches the lower limit value, the PLC controller instructs the natural gas liquid-phase pneumatic valve to be opened, liquefied natural gas enters the low-temperature heat exchange container through the heat insulation vacuum tube, and when the liquid level reaches the upper limit value, the controller instructs the liquid-phase pneumatic valve to be closed.
The beneficial effects are that: the device of the utility model uses low-temperature liquid nitrogen as a refrigerant to liquefy the gas natural gas, thereby reducing the working pressure of the liquefied natural gas storage tank and simultaneously reducing the natural gas loss.
Drawings
Fig. 1 is a schematic diagram of the structure of an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. are the directions or positional relationships shown, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The utility model will now be described in further detail by way of specific examples of embodiments in connection with the accompanying drawings.
Example 1
As shown in fig. 1, the pressure stabilizing and consumption reducing device for the liquefied natural gas storage tank comprises a natural gas storage tank 4, a low-temperature heat exchange container 17, a low-temperature liquid nitrogen storage tank 21 and a PLC controller 10, wherein liquefied natural gas 5 is stored in the natural gas storage tank 4, the bottom of the natural gas storage tank 4 is connected with the top of the low-temperature heat exchange container 17 through a natural gas heat insulation vacuum tube 11 and a liquid phase pneumatic valve 7, the bottom of the low-temperature heat exchange container 17 is connected with the top of the natural gas storage tank 4 through a immersed pump 12 and a gas phase pneumatic valve 8, and low-temperature liquefied natural gas 15 is stored in the low-temperature heat exchange container 17.
The low-temperature liquid nitrogen storage tank 21 is internally stored with liquid nitrogen 22 at the temperature of minus 196 ℃, and the bottom of the low-temperature liquid nitrogen storage tank 21 is connected with a coil 16 in the low-temperature heat exchange container 17 through a liquid nitrogen vacuum pipeline 19, a liquid nitrogen pneumatic valve 23 and a plunger pump 20; the natural gas storage tank 4 and the low-temperature heat exchange container 17 are respectively provided with a pressure transmitting device, and the liquid phase pneumatic valve 7, the gas phase pneumatic valve 8, the liquid nitrogen pneumatic valve 23, the plunger pump 20 and the pressure transmitting devices are respectively connected with the PLC 10.
Example 2
As shown in fig. 1, the pressure stabilizing and consumption reducing device for the liquefied natural gas storage tank comprises a natural gas storage tank 4, a low-temperature heat exchange container 17, a low-temperature liquid nitrogen storage tank 21 and a PLC controller 10, wherein liquefied natural gas 5 is stored in the natural gas storage tank 4, the bottom of the natural gas storage tank 4 is connected with the top of the low-temperature heat exchange container 17 through a natural gas heat insulation vacuum tube 11 and a liquid phase pneumatic valve 7, the bottom of the low-temperature heat exchange container 17 is connected with the top of the natural gas storage tank 4 through a immersed pump 12 and a gas phase pneumatic valve 8, and low-temperature liquefied natural gas 15 is stored in the low-temperature heat exchange container 17.
The low-temperature liquid nitrogen storage tank 21 is internally stored with liquid nitrogen 22 at the temperature of minus 196 ℃, and the bottom of the low-temperature liquid nitrogen storage tank 21 is connected with a coil 16 in the low-temperature heat exchange container 17 through a liquid nitrogen vacuum pipeline 19, a liquid nitrogen pneumatic valve 23 and a plunger pump 20; the natural gas storage tank 4 and the low-temperature heat exchange container 17 are respectively provided with a pressure transmitting device, and the liquid phase pneumatic valve 7, the gas phase pneumatic valve 8, the liquid nitrogen pneumatic valve 23, the plunger pump 20 and the pressure transmitting devices are respectively connected with the PLC 10.
In the embodiment, the top of the natural gas storage tank 4 is connected with a blow-down manual valve 1 and a safety valve 3 through pipelines, and the blow-down manual valve 1 is connected with a blow-down pipe 2. By manually opening the emptying manual valve 1 and the safety valve 3, the pressure in the natural gas storage tank 4 can be released, and the safety is ensured.
In the embodiment, the top of the natural gas storage tank 4 is connected and provided with a storage tank pressure transmitter 9; the top of the low temperature heat exchange container 17 is connected with a heat exchange container pressure transmitter 91. The storage tank pressure transmitter 9 and the low-temperature heat exchange container 17 are connected with the PLC controller 10 and are respectively used for monitoring the pressure values in the natural gas storage tank 4 and the low-temperature heat exchange container 17.
In this embodiment, the gas phase pneumatic valve 8 is connected to a spherical sprayer 6 at the top of the natural gas tank 4. When the pressure of the natural gas storage tank reaches 1.1MPa, the temperature of liquefied natural gas steam is-121 ℃, a storage tank pressure transmitter transmits a signal to a PLC controller, the PLC controller instructs to start the immersed pump to operate, the liquefied natural gas with lower temperature enters a spherical sprayer arranged at the top of the natural gas storage tank through a gas phase pneumatic valve, and is sprayed out of the sprayer, so that the pressure value in the natural gas storage tank is reduced.
In this embodiment, one end of the coil 16 is connected to the plunger pump 20, and the other end is connected to a plurality of nitrogen cylinders 18 via a nitrogen filling pipe 14 and a nitrogen high pressure vaporizer 13. The low-temperature liquid nitrogen flows out of the low-temperature coil pipe, absorbs heat in ambient air through the air temperature type vaporizer, is vaporized into normal-temperature nitrogen, and then enters the gas cylinder to be filled.
In this embodiment, a differential pressure type liquid level gauge 24 is mounted on the low temperature heat exchange container 17, and the differential pressure type liquid level gauge 24 is connected to the PLC controller 10. When the liquid level of the low-temperature heat exchange container reaches the lower limit value, the PLC controller instructs the natural gas liquid-phase pneumatic valve to be opened, liquefied natural gas enters the low-temperature heat exchange container through the heat insulation vacuum tube, and when the liquid level reaches the upper limit value, the controller instructs the liquid-phase pneumatic valve to be closed.
The working principle of the device of the utility model is as follows:
(1) The working pressure of the natural gas storage tank 4 is 1.2MPa, and the maximum working pressure of the low-temperature liquid nitrogen storage tank is 1.6MPa.
(2) When the liquid level of the low-temperature heat exchange container 17 reaches the lower limit value, the PLC controller instructs the liquid-phase pneumatic valve 7 to be opened, liquefied natural gas enters the low-temperature heat exchange container 17 through the heat-insulating vacuum tube, and when the liquid level reaches the upper limit value, the controller instructs the liquid-phase pneumatic valve 7 to be closed.
(3) When the temperature of the liquefied natural gas in the low-temperature heat exchange container 17 is higher than-121 ℃, the corresponding pressure is 1.1MPa, and the pressure transmitter 91 of the heat exchange container is transmitted to a PLC controller, and the PLC controller instructs to open the liquid nitrogen pneumatic valve 23 and start the plunger pump 20. At this time, the working pressure of the liquid nitrogen storage tank is 1.3MPa, and the corresponding liquid nitrogen temperature is-165 ℃.
(4) The liquid nitrogen vacuum pipeline 19 at the temperature of 165 ℃ below zero enters the coil 16 arranged in the low-temperature heat exchange container 17 through the plunger pump 20 to cool down the liquefied natural gas, when the temperature of the low-temperature liquefied natural gas 15 in the low-temperature heat exchange container 17 is reduced to a certain temperature (for example, the temperature of 140 ℃ below zero and the corresponding saturated vapor pressure of 0.33 MPa), the PLC 10 instructs to stop operating the plunger pump 20, and the liquid nitrogen pneumatic valve 23 is closed. The natural gas temperature in the low temperature heat exchange vessel 17 is between-121 ℃ and 140 ℃ and the plunger pump 20 does not stop operating.
(5) When the pressure of the natural gas storage tank reaches 1.1MPa, the temperature of the liquefied natural gas steam is-121 ℃, a storage tank pressure transmitter 9 transmits a signal to a PLC controller, the PLC controller instructs to start a immersed pump 12 to operate, the liquefied natural gas with lower temperature enters a spherical sprayer 6 arranged at the top of the natural gas storage tank through a gas phase pneumatic valve 8 and is sprayed out of the sprayer, the gas phase natural gas is liquefied after being cooled, the pressure is reduced to a lower limit value, such as 0.9MPa, and the controller instructs the immersed pump to stop operating.
(6) The rotation speed of the immersed pump 12 is controlled to enable the liquid inlet amount of the liquefied natural gas in the heat exchange container to be slightly larger than the liquid outlet amount.
(7) The low-temperature liquid nitrogen flows out of the coil 16, is absorbed by the air-temperature nitrogen high-pressure vaporizer 13 in ambient air, is vaporized into normal-temperature nitrogen, and then enters the nitrogen cylinder 18 to be filled.
The present utility model is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalents and modifications can be made to the above-mentioned embodiments without departing from the scope of the utility model.
Claims (6)
1. The utility model provides a liquefied natural gas storage tank steady voltage consumption reduction device which characterized in that: the low-temperature liquid nitrogen storage device comprises a natural gas storage tank (4), a low-temperature heat exchange container (17), a low-temperature liquid nitrogen storage tank (21) and a PLC (programmable logic controller) (10), wherein the bottom of the natural gas storage tank (4) is connected with the low-temperature heat exchange container (17) through a liquid-phase pneumatic valve (7), the bottom of the low-temperature heat exchange container (17) is connected with the natural gas storage tank (4) through a immersed pump (12) and a gas-phase pneumatic valve (8), and the bottom of the low-temperature liquid nitrogen storage tank (21) is connected with a coil pipe (16) in the low-temperature heat exchange container (17) through a liquid nitrogen pneumatic valve (23) and a plunger pump (20); the natural gas storage tank (4) and the low-temperature heat exchange container (17) are respectively provided with a pressure transmitting device, and the liquid phase pneumatic valve (7), the gas phase pneumatic valve (8), the liquid nitrogen pneumatic valve (23), the plunger pump (20) and the pressure transmitting devices are respectively connected with the PLC (10).
2. The liquefied natural gas storage tank pressure stabilizing and consumption reducing device according to claim 1, wherein: the top of the natural gas storage tank (4) is connected with a blow-down manual valve (1) and a safety valve (3) through pipelines, and the blow-down manual valve (1) is connected with a blow-down pipe (2).
3. The liquefied natural gas storage tank pressure stabilizing and consumption reducing device according to claim 1, wherein: the top of the natural gas storage tank (4) is connected with a storage tank pressure transmitter (9); the top of the low-temperature heat exchange container (17) is connected with a heat exchange container pressure transmitter (91).
4. The liquefied natural gas storage tank pressure stabilizing and consumption reducing device according to claim 1, wherein: the gas phase pneumatic valve (8) is connected with a spherical sprayer (6) at the top of the natural gas storage tank (4).
5. The liquefied natural gas storage tank pressure stabilizing and consumption reducing device according to claim 1, wherein: one end of the coil pipe (16) is connected with the plunger pump (20), and the other end of the coil pipe is connected with a plurality of nitrogen cylinders (18) through a nitrogen high-pressure vaporizer (13).
6. The liquefied natural gas storage tank pressure stabilizing and consumption reducing device according to claim 1, wherein: and a differential pressure type liquid level meter (24) is arranged on the low-temperature heat exchange container (17), and the differential pressure type liquid level meter (24) is connected with the PLC (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320444719.9U CN219995055U (en) | 2023-03-10 | 2023-03-10 | Liquefied natural gas storage tank pressure stabilizing and consumption reducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320444719.9U CN219995055U (en) | 2023-03-10 | 2023-03-10 | Liquefied natural gas storage tank pressure stabilizing and consumption reducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219995055U true CN219995055U (en) | 2023-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320444719.9U Active CN219995055U (en) | 2023-03-10 | 2023-03-10 | Liquefied natural gas storage tank pressure stabilizing and consumption reducing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219995055U (en) |
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2023
- 2023-03-10 CN CN202320444719.9U patent/CN219995055U/en active Active
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