CN210601032U - Novel liquefied natural gas unloading system capable of being started quickly - Google Patents
Novel liquefied natural gas unloading system capable of being started quickly Download PDFInfo
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- CN210601032U CN210601032U CN201921313701.5U CN201921313701U CN210601032U CN 210601032 U CN210601032 U CN 210601032U CN 201921313701 U CN201921313701 U CN 201921313701U CN 210601032 U CN210601032 U CN 210601032U
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 165
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 226
- 239000003345 natural gas Substances 0.000 claims abstract description 113
- 239000007788 liquid Substances 0.000 claims abstract description 52
- 239000007789 gas Substances 0.000 claims abstract description 47
- 238000003860 storage Methods 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims description 33
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000012071 phase Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000009835 boiling Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 229930195734 saturated hydrocarbon Natural products 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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Abstract
The utility model provides a novel liquefied natural gas system of unloading of quick start, LNG tank wagon pass through LNG loading and unloading arm and unload the circuit and communicate to the LNG storage tank, and the LNG tank wagon still communicates to low temperature natural gas system gas station through low temperature natural gas inlet line, wherein: the low-temperature natural gas station comprises a high-pressure natural gas inlet pipe, a desuperheating LNG pipe, a desuperheater and a liquid separating tank, wherein the high-pressure natural gas inlet pipe and the desuperheating LNG pipe are respectively connected to the desuperheater, the high-pressure natural gas is sprayed in the desuperheater to cool down the LNG, an outlet pipeline of the desuperheater is communicated to the liquid separating tank, and a gas phase outlet of the liquid separating tank is communicated to an LNG tank wagon through a low-temperature natural gas inlet line. The utility model discloses carry the natural gas cooling back and carry out the pressure boost to the LNG tank wagon and unload, the operation is stable and the operation maintenance is simple and convenient, and fundamentally has improved the operation security simultaneously, has saved investment and operation cost to greatly improved the efficiency of unloading.
Description
Technical Field
The utility model relates to a novel liquefied natural gas system of unloading of quick start belongs to liquefied natural gas warehousing and transportation field.
Background
Liquefied Natural Gas (LNG) is a high-quality energy widely used, and due to the characteristics of high calorific value, high efficiency, low pollution and the like of LNG, the LNG is widely used in various fields of the national civilization, and the energy ratio is gradually increased. The LNG emergency storage peak shaving station is generally provided with a loading and unloading system and corresponding auxiliary facilities for pre-cooling during starting and peak shaving during later operation of the station yard, and the currently commonly used LNG unloading system and facilities comprise modes of self-pressurization of an LNG tank car by an air-temperature gasifier, installation of an unloading pump on an unloading arm, pressurization of high-pressure normal-temperature natural gas and the like.
The unloading process flow of the self-pressurization of the air-temperature gasifier is complex, the number of flange interfaces is large, and the purging replacement and precooling rates are slow. Each precooling needs to be controlled to be about 20-30 minutes, otherwise, overlarge stress is easily generated to cause flange leakage; the gasification rate of the air-temperature gasifier is low, the pressurization process of the tank car is slow, and meanwhile, the influence of the environmental temperature is large, particularly in winter or extremely severe weather, the air-temperature gasifier is easy to frost or freeze, the heat exchange effect and the self-pressurization rate of the gasifier are obviously reduced, the gas phase pressure of the LNG tank car is influenced, the unloading rate is reduced, and the unloading time is increased; in addition, more unloading systems need to be arranged on the same unloading scale, technological facilities such as equipment and pipelines are added, project investment is high, the occupied area is large, the land resource utilization rate is low, and the leakage risk of the unloading flange pipe orifice is increased to a certain extent. Therefore, the unloading is carried out by utilizing the modes of gasification of the air temperature gasifier and self-pressurization of the tank car, the environmental adaptability is poor, the operation flow is complex, the operation time consumption is long, the occupied area is large, and the investment is high.
The unloading pump is arranged on the unloading arm, so that the unloading speed can be greatly increased, the unloading process is simplified, the equipment investment is increased, and the investment of a loading and unloading vehicle pry can be doubled by the aid of the unloading pump; meanwhile, along with the reduction of the liquid level of the LNG tank car, the unloading pump cannot avoid the phenomena of gas-liquid two-phase, severe cavitation and the like, the safe and stable operation of the unloading pump is influenced, the unloading operation cannot be continuously carried out, the maintenance frequency is increased, the unloading efficiency is further influenced, and the operation cost is increased.
Compared with the two unloading modes, the mode of high-pressure natural gas pressurization accelerates the pressurization process of the LNG tank car on the premise of saving equipment and pipe fitting investment, thereby improving the unloading efficiency. However, high-pressure natural gas generally comes from an outlet of a station BOG compressor or a gasifier, the temperature of the high-pressure natural gas is close to the ambient temperature, a working condition that the outlet temperature is too high (far beyond the ambient temperature) occurs when the pressure ratio of the BOG compressor is too high, and after the natural gas with the too high temperature enters an LNG tank car storage tank, potential safety hazards such as saturated hydrocarbon boiling, stress concentration on the inner wall of the LNG storage tank and the like are caused due to too large temperature difference between a gas phase and a liquid phase; meanwhile, the tank car temperature is increased to cause the problems of storage tank pressure increase, low normal-temperature natural gas condensation pressurization efficiency and the like; after unloading, the LNG tank car storage tank is in an overheated state, and the storage tank precooling operation needs to be carried out again when loading is carried out again, so that the precooling time and the operation cost are increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the not enough of above-mentioned prior art, provide a novel liquefied natural gas system of unloading of quick start, solve following technical problem:
1. after the normal-temperature natural gas enters the LNG tank wagon, the LNG tank wagon has the safety problems of saturated hydrocarbon boiling and stress concentration of the inner wall of a tank wagon storage tank due to overlarge temperature difference between a gas phase and a liquid phase;
2. the problems of pressure rise and low normal-temperature natural gas condensation pressurization efficiency caused by temperature rise in the tank car storage tank are solved;
3. the tank car storage tank is in a hot state after unloading, and precooling is needed again when loading is carried out again.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides a novel liquefied natural gas of quick start unloads car system, LNG tank wagon pass through LNG loading and unloading arm and unload the circuit and communicate to the LNG storage tank, its characterized in that: the LNG tank wagon still communicates to low temperature natural gas system gas station through low temperature natural gas inlet line, wherein:
the low-temperature natural gas station comprises a high-pressure natural gas inlet pipe, a desuperheating LNG pipe, a desuperheater and a liquid separating tank, wherein the high-pressure natural gas inlet pipe and the desuperheating LNG pipe are respectively connected to the desuperheater, the high-pressure natural gas is sprayed in the desuperheater to cool down the LNG, an outlet pipeline of the desuperheater is communicated to the liquid separating tank, and a gas phase outlet of the liquid separating tank is communicated to an LNG tank wagon through a low-temperature natural gas inlet line.
The novel liquefied natural gas unloading system capable of being started quickly, wherein: an LNG unloading main pipe, an LNG loading main pipe, a BOG return gas main pipe and a low-temperature natural gas inlet main pipe are arranged in the loading and unloading station;
the LNG unloading main pipe is provided with at least one LNG unloading branch line, the LNG loading main pipe is provided with at least one LNG loading branch line, the BOG return gas main pipe is provided with at least one BOG return gas branch line, the upstream of the low-temperature natural gas inlet main pipe is communicated with a gas phase outlet of the liquid separation tank, and the downstream of the low-temperature natural gas inlet main pipe is provided with at least one low-temperature natural gas inlet branch line;
the LNG unloading branch line and the LNG loading branch line are converged and then connected to the LNG loading and unloading arm;
the BOG gas return branch line and the low-temperature natural gas inlet branch line are converged and then connected to a BOG gas return arm, and the BOG gas return arm is communicated with the LNG tank wagon.
The novel liquefied natural gas unloading system capable of being started quickly, wherein: the LNG loading branch line is provided with a loading flow transmitter, a loading pressure transmitter, a loading flow regulating valve, a loading stop valve, a loading check valve and a loading safety valve, and the loading flow transmitter is in signal connection with the loading flow regulating valve to control the loading flow in a closed-loop manner.
The novel liquefied natural gas unloading system capable of being started quickly, wherein: and the LNG unloading branch line and the LNG loading branch line are connected to a section between the LNG loading arms after being gathered, and a loading temperature transmitter and a clean-up pipeline cut-off valve are arranged on the section between the LNG loading arms.
The novel liquefied natural gas unloading system capable of being started quickly, wherein: and the BOG air return branch line is provided with an air return safety valve and an air return stop valve.
The novel liquefied natural gas unloading system capable of being started quickly, wherein: the low-temperature natural gas inlet branch line is provided with a low-temperature natural gas inlet valve and a low-temperature natural gas check valve.
The novel liquefied natural gas unloading system capable of being started quickly, wherein: and a return gas pressure transmitter and a return gas temperature transmitter are arranged on a pipe section, connected between the BOG return gas arms, of the BOG return gas branch line and the low-temperature natural gas inlet branch line after convergence.
The novel liquefied natural gas unloading system capable of being started quickly, wherein: the high-pressure natural gas inlet pipe is sequentially provided with a high-pressure natural gas cut-off valve, a high-pressure natural gas pressure control valve, a high-pressure natural gas pressure transmitter and a high-pressure natural gas safety valve, the temperature reduction LNG pipe is provided with a temperature reduction LNG cut-off valve, and the high-pressure natural gas pressure transmitter is in signal connection with the high-pressure natural gas pressure control valve to control the pressure of the high-pressure natural gas in a closed-.
The novel liquefied natural gas unloading system capable of being started quickly, wherein: the liquid separation tank is provided with a liquid separation tank temperature transmitter, a liquid separation tank pressure transmitter, a liquid separation tank liquid level transmitter, a liquid separation tank safety valve and a liquid separation tank discharge valve; and a valve rear pipeline of the safety valve of the liquid separation tank is connected to the BOG gas return main pipe, and a valve rear pipeline of the discharge valve of the liquid separation tank is connected to the LNG unloading main pipe.
The novel liquefied natural gas unloading system capable of being started quickly, wherein: and hand valves are arranged behind the LNG loading arm and the BOG gas return arm.
Compared with the prior art, the utility model discloses the beneficial effect who has is:
1. the high-pressure natural gas for pressurizing the LNG tank car is cooled by the desuperheater and then pressurized and unloaded, so that the operation safety and the unloading efficiency are fundamentally improved.
2. The system has convenient operation, simple operation and maintenance and low investment and operation cost.
Drawings
Fig. 1 is a block diagram of an lng unloading system according to the present invention.
Description of reference numerals: 1-LNG unloading main; 2-LNG loading header pipe; 3-BOG gas return header pipe; 4-high pressure natural gas inlet pipe; 5-a desuperheating LNG pipe; 6-a low-temperature natural gas inlet main pipe; 7-low temperature natural gas inlet branch line; 8-LNG loading branch line; 9-LNG unloading branch line; 10-BOG return branch line; 11-a loading flow regulating valve; 12-a truck-loading flow transmitter; 13-loading pressure transmitter; 14-loading check valve; 15-loading safety valve; 16-a truck-loading temperature transmitter; 17-loading cut-off valve; 18-dump shut-off valve; 19-unloading check valve; 20-return air pressure transmitter; 21-return air temperature transmitter; 22-a gas return safety valve; 23-a return air cut-off valve; 24-a high-pressure natural gas shut-off valve; 25-high pressure natural gas safety valve; 26-high pressure natural gas pressure control valve; 27-high pressure natural gas safety valve; 28-a desuperheater; 29-a temperature-reducing LNG shut-off valve; 30-temperature transmitter of the liquid separation tank; 31-liquid separation tank; 32-low temperature natural gas inlet valve; 33-cryogenic natural gas check valve; 34-LNG loading and unloading arm; 35-BOG gas return arm; 36-LNG loading arm hand valve; 37-BOG return arm hand valve; 38-a separating tank discharge valve; 39-pressure transmitter of the liquid separation tank; 40-liquid separation tank liquid level transmitter; 41-safety valve of liquid separating tank; 42-a drain line shut-off valve;
Detailed Description
Some specific embodiments of the invention will be described in detail below, by way of example and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale.
Referring to fig. 1, the utility model provides a novel liquefied natural gas system of unloading of quick start, it includes four main lines and a low temperature natural gas station, and four main lines are LNG main pipe 1 of unloading, LNG loading house steward 2, BOG return-air house steward 3 and low temperature natural gas inlet house steward 6 respectively.
The LNG unloading main pipe 1 is communicated to an LNG storage tank and can convey LNG in a tank wagon into the storage tank (not shown in the figure); the LNG loading main pipe 2 is communicated to an external delivery main pipe (not shown in the figure) at the outlet of the LNG storage tank loading pump and is used for delivering LNG output by the loading pump to a loading and unloading station; the BOG return gas header pipe 3 is communicated to a peak shaving station or a receiving station (not shown in the figure) and is used for conveying BOG return gas to a BOG processing system (not shown in the figure) in the peak shaving station or the receiving station for centralized collection and processing; the low-temperature natural gas inlet main pipe 6 is communicated with a low-temperature natural gas making station.
In this example, two loading and unloading units (the internal components are the same, one of which is not shown) are arranged in the loading and unloading station, two branch lines are respectively arranged on the four main pipeline and respectively lead to the two loading and unloading units, and for one loading and unloading unit, the four branch lines leading to the inside are respectively an LNG unloading branch line 9, an LNG loading branch line 8, a BOG return branch line 10 and a low-temperature natural gas inlet branch line 7.
The LNG unloading branch line 9 and the LNG loading branch line 8 are converged and then communicated to the LNG loading and unloading arm 34, and then are connected with the tank car. The LNG unloading branch line 9 is provided with an unloading cut-off valve 18 and an unloading check valve 19, and the LNG loading branch line 8 is provided with a loading flow transmitter 12, a loading pressure transmitter 13, a loading flow regulating valve 11, a loading cut-off valve 17, a loading check valve 14 and a loading safety valve 15. And a loading temperature transmitter 16 and a clean-up pipeline cut-off valve 42 are arranged on a pipe section of the LNG loading arm 34 connected with the two branch lines after being converged, and an LNG loading arm hand valve 36 is connected to the rear end of the LNG loading arm 34.
The loading temperature transmitter 16 is arranged behind a junction of the LNG unloading branch line 9 and the LNG loading branch line 8, detects and displays the current LNG temperature parameter in the pipeline no matter during loading or unloading, and sends out an alarm signal when the detected temperature exceeds a preset value. The loading pressure transmitter 13 detects and displays LNG pressure parameters in the LNG loading pipeline 13, and when the detected pressure exceeds a preset value, an alarm signal is sent out. The loading flow transmitter 12 is in signal connection with the loading flow regulating valve 11, and controls the loading flow in a closed loop mode.
The BOG return gas branch line 10 and the low-temperature natural gas inlet branch line 7 are converged and then communicated to the BOG return gas arm 35, and then are connected with the tank car. The BOG return branch line 10 is provided with a return stop valve 23 and a return safety valve 22, and the low-temperature natural gas inlet branch line 7 is provided with a low-temperature natural gas inlet valve 32 and a low-temperature natural gas check valve 33. And a pipe section which is communicated between the two branch lines after the two branch lines are converged and the BOG air return arm 35 is provided with an air return pressure transmitter 20 and an air return temperature transmitter 21, and a BOG air return arm hand valve 37 is connected behind the BOG air return arm 35.
Wherein, no matter loading or unloading, return air pressure transmitter 20 and return air temperature transmitter 21 can detect and display natural gas pressure and temperature parameter in the pipeline to when the pressure or temperature value that detects surpass the default, send alarm signal.
The low-temperature natural gas production station is used for producing low-temperature natural gas, and the production method comprises the steps of spraying low-temperature LNG (liquefied natural gas) on normal-temperature high-pressure natural gas, and then carrying out gas-liquid separation to produce the low-temperature natural gas. A high-pressure natural gas inlet pipe 4 and a temperature-reducing LNG pipe 5 are laid in the gas station and used for conveying high-pressure natural gas and LNG to the gas station, the other end of the high-pressure natural gas inlet pipe 4 is communicated to a high-pressure natural gas source (not shown in the figure), and the other end of the temperature-reducing LNG pipe 5 is communicated to an LNG external transmission main pipe (not shown in the figure).
The high-pressure natural gas inlet pipe 4 and the desuperheating LNG pipe 5 are intersected at the desuperheater 28, an outlet pipeline of the desuperheater 28 is connected to an inlet of the liquid separating tank 31, and a gas phase outlet pipeline of the liquid separating tank 31 is connected to the low-temperature natural gas inlet main pipe 6. When the system is in operation, the high-pressure natural gas is cooled by spraying the LNG in the desuperheater 28, then mixed with the LNG and enters the liquid separation tank 31 for gas-liquid separation, and finally, the pure low-temperature natural gas is conveyed to the natural gas inlet main pipe 6.
And the high-pressure natural gas inlet pipe 4 is sequentially provided with a high-pressure natural gas cut-off valve 24, a high-pressure natural gas pressure control valve 25, a high-pressure natural gas pressure transmitter 26 and a high-pressure natural gas safety valve 27, and the temperature-reducing LNG pipe 5 is provided with a temperature-reducing LNG cut-off valve 29. Wherein, the high-pressure natural gas pressure transmitter 26 is in signal connection with the high-pressure natural gas pressure control valve 25, and controls the pressure of the high-pressure natural gas in a closed loop mode.
The liquid separation tank 31 is provided with a liquid separation tank temperature transmitter 30, a liquid separation tank pressure transmitter 39, a liquid separation tank liquid level transmitter 40, a liquid separation tank safety valve 41 and a liquid separation tank discharge valve 38. Wherein, knockout drum temperature transmitter 30 and desuperheater 28 signal connection feed back the knockout drum temperature to desuperheater 28 to control the flow that sprays LNG. The separating tank level transmitter 40 is in signal connection with the separating tank drain valve 28, and when the liquid level is higher than a preset value, the separating tank drain valve 38 is opened. And a valve rear pipeline of a discharge valve 38 of the liquid separation tank is connected to the LNG unloading main pipe 1, and a valve rear pipeline of a safety valve 41 of the liquid separation tank is connected to the BOG return gas main pipe 3.
In use, the lng unloading process of this example is as follows:
1. purging and loading the LNG loading and unloading arm 34 and the BOG air return arm 35 by using nitrogen, checking the air tightness of the system after replacement is finished, and emptying the nitrogen after the checking is finished;
2. respectively opening a high-pressure natural gas cut-off valve 24 on a high-pressure natural gas inlet pipe 4 and a temperature-reducing LNG cut-off valve 29 on a temperature-reducing LNG pipe 5, simultaneously opening an unloading cut-off valve 18 on an LNG unloading branch pipe 9, and closing a return cut-off valve 23 on a BOG return branch pipe 10 and a loading cut-off valve 17 on an LNG loading branch pipe 8;
3. slowly opening an LNG loading arm hand valve 36, and pre-cooling an LNG loading arm 34 by using LNG on the tank car;
4. after precooling is finished, opening a low-temperature natural gas inlet valve 32, opening a BOG return arm hand valve 37, injecting low-temperature natural gas into a tank car for pressurization, simultaneously pressurizing LNG in the tank car, and unloading the LNG to a storage tank through an LNG unloading branch line 9 and an LNG unloading main pipe 1;
5. after unloading, the high-pressure natural gas cut-off valve 24 and the temperature-reducing LNG cut-off valve 29 are closed, the unloading cut-off valve 18 is closed, the return gas cut-off valve 23 is opened to empty the tank car and residual natural gas in the system, and the low-temperature natural gas inlet valve 32 is closed after the unloading is finished.
The loading auxiliary function of this example flow is simple relatively when using, only needs to open loading trip valve 17 and BOG return-air valve 23 to ensure that unloading trip valve 18 and low temperature natural gas inlet valve 32 are in the closed condition, open the loading pump (not shown in the figure) and can load, reset each valve after the loading is accomplished.
The utility model has the advantages that: the system is stable in operation, simple and convenient to operate and maintain, operation safety is improved fundamentally, investment and operation cost are saved, and unloading efficiency is improved greatly.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a novel liquefied natural gas of quick start unloads car system, LNG tank wagon pass through LNG loading and unloading arm and unload the circuit and communicate to the LNG storage tank, its characterized in that: the LNG tank wagon still communicates to low temperature natural gas system gas station through low temperature natural gas inlet line, wherein:
the low-temperature natural gas station comprises a high-pressure natural gas inlet pipe, a desuperheating LNG pipe, a desuperheater and a liquid separating tank, wherein the high-pressure natural gas inlet pipe and the desuperheating LNG pipe are respectively connected to the desuperheater, the high-pressure natural gas is sprayed in the desuperheater to cool down the LNG, an outlet pipeline of the desuperheater is communicated to the liquid separating tank, and a gas phase outlet of the liquid separating tank is communicated to an LNG tank wagon through a low-temperature natural gas inlet line.
2. The novel rapid start lng unloading system of claim 1, wherein: an LNG unloading main pipe, an LNG loading main pipe, a BOG return gas main pipe and a low-temperature natural gas inlet main pipe are arranged in the loading and unloading station;
the LNG unloading main pipe is provided with at least one LNG unloading branch line, the LNG loading main pipe is provided with at least one LNG loading branch line, the BOG return gas main pipe is provided with at least one BOG return gas branch line, the upstream of the low-temperature natural gas inlet main pipe is communicated with a gas phase outlet of the liquid separation tank, and the downstream of the low-temperature natural gas inlet main pipe is provided with at least one low-temperature natural gas inlet branch line;
the LNG unloading branch line and the LNG loading branch line are converged and then connected to the LNG loading and unloading arm;
the BOG gas return branch line and the low-temperature natural gas inlet branch line are converged and then connected to a BOG gas return arm, and the BOG gas return arm is communicated with the LNG tank wagon.
3. The novel rapid start lng unloading system of claim 2, wherein: the LNG loading branch line is provided with a loading flow transmitter, a loading pressure transmitter, a loading flow regulating valve, a loading stop valve, a loading check valve and a loading safety valve, and the loading flow transmitter is in signal connection with the loading flow regulating valve to control the loading flow in a closed-loop manner.
4. The novel rapid start lng unloading system of claim 2, wherein: and the LNG unloading branch line and the LNG loading branch line are connected to a section between the LNG loading arms after being gathered, and a loading temperature transmitter and a clean-up pipeline cut-off valve are arranged on the section between the LNG loading arms.
5. The novel rapid start lng unloading system of claim 2, wherein: and the BOG air return branch line is provided with an air return safety valve and an air return stop valve.
6. The novel rapid start lng unloading system of claim 2, wherein: the low-temperature natural gas inlet branch line is provided with a low-temperature natural gas inlet valve and a low-temperature natural gas check valve.
7. The novel rapid start lng unloading system of claim 2, wherein: and a return gas pressure transmitter and a return gas temperature transmitter are arranged on a pipe section, connected between the BOG return gas arms, of the BOG return gas branch line and the low-temperature natural gas inlet branch line after convergence.
8. The novel rapid start lng unloading system of claim 1, wherein: the high-pressure natural gas inlet pipe is sequentially provided with a high-pressure natural gas cut-off valve, a high-pressure natural gas pressure control valve, a high-pressure natural gas pressure transmitter and a high-pressure natural gas safety valve, the temperature reduction LNG pipe is provided with a temperature reduction LNG cut-off valve, and the high-pressure natural gas pressure transmitter is in signal connection with the high-pressure natural gas pressure control valve to control the pressure of the high-pressure natural gas in a closed-.
9. The novel rapid start lng unloading system of claim 2, wherein: the liquid separation tank is provided with a liquid separation tank temperature transmitter, a liquid separation tank pressure transmitter, a liquid separation tank liquid level transmitter, a liquid separation tank safety valve and a liquid separation tank discharge valve; and a valve rear pipeline of the safety valve of the liquid separation tank is connected to the BOG gas return main pipe, and a valve rear pipeline of the discharge valve of the liquid separation tank is connected to the LNG unloading main pipe.
10. The novel rapid start lng unloading system of claim 2, wherein: and hand valves are arranged behind the LNG loading arm and the BOG gas return arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921313701.5U CN210601032U (en) | 2019-08-13 | 2019-08-13 | Novel liquefied natural gas unloading system capable of being started quickly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921313701.5U CN210601032U (en) | 2019-08-13 | 2019-08-13 | Novel liquefied natural gas unloading system capable of being started quickly |
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| CN210601032U true CN210601032U (en) | 2020-05-22 |
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| CN201921313701.5U Withdrawn - After Issue CN210601032U (en) | 2019-08-13 | 2019-08-13 | Novel liquefied natural gas unloading system capable of being started quickly |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110469771A (en) * | 2019-08-13 | 2019-11-19 | 中国寰球工程有限公司 | The liquefied natural gas unloading system of novel quick start |
| CN116006888A (en) * | 2022-12-12 | 2023-04-25 | 广东建成机械设备有限公司 | Tank truck charging and discharging control device and method, tank truck pipeline system and tank truck |
-
2019
- 2019-08-13 CN CN201921313701.5U patent/CN210601032U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110469771A (en) * | 2019-08-13 | 2019-11-19 | 中国寰球工程有限公司 | The liquefied natural gas unloading system of novel quick start |
| CN110469771B (en) * | 2019-08-13 | 2023-12-22 | 中国寰球工程有限公司 | Novel liquefied natural gas unloading system capable of being started quickly |
| CN116006888A (en) * | 2022-12-12 | 2023-04-25 | 广东建成机械设备有限公司 | Tank truck charging and discharging control device and method, tank truck pipeline system and tank truck |
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