CN102392935A - Liquefied natural gas loading system and method - Google Patents
Liquefied natural gas loading system and method Download PDFInfo
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- CN102392935A CN102392935A CN2011103323082A CN201110332308A CN102392935A CN 102392935 A CN102392935 A CN 102392935A CN 2011103323082 A CN2011103323082 A CN 2011103323082A CN 201110332308 A CN201110332308 A CN 201110332308A CN 102392935 A CN102392935 A CN 102392935A
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Abstract
The invention discloses an LNG (liquefied natural gas) loading system and method. wherein the system comprises an LNG loading header pipe, an LNG loading pipeline, a BOG (boil-off gas )return arm, a BOG pipeline, a BOG header pipe, a flow measurement instrument and a flow control valve, wherein the LNG loading header pipe is connected with an LNG storage tank and is used for delivering LNG in the LNG storage tank to an loading station; the LNG loading pipeline is arranged at the loading station, is connected with the LNG loading header pipe, and is used for delivering LNG to an loading arm connected with the LNG loading pipeline for loading LNG on an LNG tank wagon; the BOG return arm is connected with the LNG tank wagon; the BOG pipeline is connected with the BOG return arm; the GOG header pipe is connected with the BOG pipeline, and is used for delivering BOG returned by the LNG tank wagon to a gas phase space of the LNG storage tank or a BOG treatment system; the flow measurement instrument and the flow control valve are respectively arranged on the LNG loading pipeline, and are respectively electrically connected with a batch loading controller; and the batch loading controller is connected with an information card on the LNG tank wagon, and is used for controlling the on and off of the flow control valve according to the volume of the LNG tank wagon recorded in the information card and the flow of LNG measured by the flow measurement instrument.
Description
Technical field
The present invention relates to the LNG Liquefied natural gas field, in particular to a kind of LNG Liquefied natural gas loading system and method.
Background technique
LNG Liquefied natural gas (LNG, Liquefied Natural Gas) is a kind of high-grade energy, has calorific value height, the little characteristics of combustion pollution.LNG shipping and tank car transportation dual mode are adopted in the long-distance transportation of LNG Liquefied natural gas; When adopting the transportation of LNG tank car; Need design tank car loading system, LNG is carried and is filled in the tank car through pipeline from the LNG storage tank, pass through tank car transportation and direct marketing after the entrucking simultaneously to the user; Therefore, need the Trade Measures system be set simultaneously at loading station.The way that Trade Measures adopts tank car to weigh usually realizes that through the weight before and after the entrucking of weighing tank car, its difference is exactly the loading of freight waggon of LNG, as the foundation of LNG volume of trade clearing.
Existing technology adopts every entrucking branch line manually to control its entrucking flow, and compounding practice workman LNG filling weight in the manual observation tank car in the entrucking process judges whether tank car is filled, then through the tank car weighbridge metering loading of freight waggon.Existing technology relatively is fit to the occasion that the tank car entrucking branch line loading of freight waggon few, every day is little, operator's needs lack; Big when the tank car loading of freight waggon, the entrucking branch line is many, when car loading operation is frequent; If still adopt existing technology; Have then that each tank car loading of freight waggon is inhomogeneous, problems such as entrucking is excessive appear in a large amount of personnel of needs operations simultaneously, labor intensity greatly, easily; The excessive LNG of causing of entrucking simultaneously overflows in tank car, causes the LNG waste, also brings the problem of the LNG gasification formation inflammable gas initiation potential after overflowing simultaneously.
Summary of the invention
The present invention provides a kind of LNG Liquefied natural gas loading system and method, in order to improve the efficient of entrucking, guarantees that the entrucking process stabilization is reliable.
For achieving the above object, the invention provides a kind of LNG Liquefied natural gas loading system, it comprises:
LNG entrucking house steward is connected with the LNG storage tank, and the LNG in the LNG storage tank is delivered to loading station;
LNG entrucking pipeline is arranged on loading station, is connected with LNG entrucking house steward, LNG is delivered to the coupled entrucking arm that connects the LNG tank car is carried out entrucking;
BOG (Boil Off Gas, boil-off gas) return arm is connected with the LNG tank car;
The BOG pipeline is connected with the BOG return arm;
House steward BOG is connected with the BOG pipeline, will be delivered to the gas-phase space or the BOG processing system of LNG storage tank by the BOG that the LNG tank car returns;
Flow measurement instrument and flow control valve are separately positioned on the LNG entrucking pipeline, and are electrically connected with batch entrucking controller respectively;
In batches the entrucking controller is connected with release on the LNG tank car, according to the opening and closing of the flow control flow control valve of the volume of the LNG tank car that writes down in the release, LNG that flow measurement instrument records.
Preferable, above-mentioned loading system also comprises: liquid level detector, and be arranged on the LNG tank car and and be electrically connected with batch entrucking controller, the liquid level signal of the LNG tank car of its detection is passed to entrucking controller in batches; Wherein, when liquid level signal surpassed predefined numerical value, the entrucking controller sent alarm signal in batches, and the interlocking close flow control valve.
Preferable, above-mentioned loading system also comprises: first temperature indicating instrument, be arranged on the LNG entrucking pipeline, and measure and show the temperature of LNG entrucking pipeline, and when the temperature that records is higher than predefined CLV ceiling limit value, send alarm signal.
Preferable, above-mentioned loading system also comprises: the first pressure indicating meter, be arranged on the LNG entrucking pipeline, and measure and the interior pressure of demonstration LNG entrucking pipeline, and when the pressure that records is higher than predefined CLV ceiling limit value, send alarm signal.
Preferable, above-mentioned batch controller also has the flux cumulating function of measuring, and the LNG amount of accumulative total entrucking in a period of time is noted also teletransmission to server.
Preferable, above-mentioned loading system also comprises: pressure controlled valve and pressure measuring instruments are separately positioned on the BOG pipeline.
Preferable, above-mentioned loading system also comprises: second temperature indicating instrument, be arranged on the BOG pipeline, and measure and show the temperature of BOG pipeline, and when the temperature that records is higher than predefined CLV ceiling limit value, send alarm signal.
Preferable, above-mentioned loading system also comprises: the second pressure indicating meter, be arranged on the BOG pipeline, and measure and the interior pressure of demonstration BOG pipeline, and when the pressure that records is higher than predefined CLV ceiling limit value, send alarm signal.
Preferable, adopt LNG entrucking flexible pipe and BOG to return flexible pipe and replace above-mentioned LNG entrucking arm and above-mentioned BOG return arm respectively.
For achieving the above object, the present invention also provides a kind of LNG Liquefied natural gas entrucking method, and it may further comprise the steps:
LNG entrucking house steward through being connected with the LNG storage tank is delivered to loading station with the LNG in the LNG storage tank;
Through the LNG entrucking pipeline that is arranged on loading station and is connected LNG is delivered to the coupled entrucking arm that connects the LNG tank car is carried out entrucking with LNG entrucking house steward;
The BOG that is returned by the LNG tank car is through being delivered to the gas-phase space or the BOG processing system of LNG storage tank with BOG return arm, BOG pipeline and house steward BOG that the LNG tank car links to each other successively;
Wherein, LNG entrucking pipeline is provided with flow measurement instrument and flow control valve, and flow measurement instrument and flow control valve are electrically connected with batch entrucking controller respectively; In batches the entrucking controller is connected with release on the LNG tank car, according to the opening and closing of the flow control flow control valve of the volume of the LNG tank car that writes down in the release, LNG that flow measurement instrument records.
In the above-described embodiments; LNG entrucking house steward will be delivered to loading station from the LNG of LNG storage tank; BOG returns house steward the BOG that produces in the entrucking process is back to the gas-phase space or the BOG processing system of LNG storage tank, with the pressure between balance LNG storage tank and the LNG tank car; Automatically control the opening and closing of flow control valve on the LNG entrucking pipeline through batch entrucking controller, improved the efficient of entrucking, avoided overflowing of LNG and the danger that causes, make that LNG entrucking process is able to effectively with reliablely and stablely realize.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technological scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the LNG Liquefied natural gas loading system schematic representation of one embodiment of the invention;
Fig. 2 is the flow control valve flow control plotted curve of one embodiment of the present invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technological scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiments.Based on the embodiment among the present invention, those of ordinary skills are not paying the every other embodiment who is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Fig. 1 is the LNG Liquefied natural gas loading system schematic representation of one embodiment of the invention; In Fig. 1, MV-1 is a manual ball valve; MV-2 is a safety check; FCV is a flow control valve; XV is automatic switch valve (pneumatic or electronic); PSV is a safety valve; PI is the pressure indicating meter; TI is a temperature indicating instrument; FIC is flow indication and control instrument; TIC is temperature indication and control instrument; HIC is manual control instrument; Arrow S1 representes that LNG is from the LNG storage tank; Arrow S2 representes that BOG is delivered to LNG storage tank or BOG processing system.
As shown in Figure 1, this loading system comprises:
LNG entrucking house steward 11 is connected with the LNG storage tank, and the LNG in the LNG storage tank is delivered to loading station;
Flow measurement instrument and flow control valve are separately positioned on the LNG entrucking pipeline, and are electrically connected with batch entrucking controller 17 respectively;
In batches entrucking controller 17 is connected with release on the LNG tank car 18, according to the opening and closing of the flow control flow control valve of the volume of the LNG tank car that writes down in the release, LNG that flow measurement instrument records.
In the present embodiment, LNG entrucking house steward will be delivered to loading station from the LNG of LNG storage tank, and BOG returns house steward the BOG that produces in the entrucking process is back to the gas-phase space or the BOG processing system of LNG storage tank, with the pressure between balance LNG storage tank and the LNG tank car; Automatically control the opening and closing of flow control valve on the LNG entrucking pipeline through batch entrucking controller, improved the efficient of entrucking, avoided overflowing of LNG and the danger that causes, make that LNG entrucking process is able to effectively with reliablely and stablely realize.
LNG entrucking pipeline, LNG entrucking arm, BOG return arm and BOG pipeline form a LNG entrucking branch line, according to the size of the LNG loading of freight waggon many entrucking branch lines can be set.
Adopt the entrucking process of the foregoing description following:
The LNG tank car is at first swiped the card after arriving loading station, carries out empty wagons then and weighs; In LNG information of vehicles to be installed input batch controller, then the LNG tank car gets into the entrucking branch line of certain bar appointment under operator's guidance, with LNG entrucking arm be connected with tank car with the BOG return arm, leak detection, electrostatic grounding; Press the entrucking button that links to each other with batch controller, start the entrucking program and carry out the automatic loading operation, after the LNG tank car is filled; Batch controller can stop entrucking automatically, and the entrucking personnel are with LNG entrucking arm and BOG return arm and the disengaging of LNG tank car then, and the LNG tank car leaves the entrucking branch line; Weigh to the outlet port and handle the trade transaction formality; There is the batch controller that signal links to each other to go out this LNG loading of freight waggon by autoweighing with weighbridge, and calculates total value of goods of this car, in the release with these information inputs LNG tank car according to predefined LNG unit price; As the foundation of trade transaction, batch controller is noted the needed information of this car loading of freight waggon simultaneously.
Fig. 2 is the flow control valve flow control plotted curve of one embodiment of the present invention.As shown in Figure 2, the flow curve of flow control valve has in the beginning of entrucking process with when finishing to be increased and the function that reduces gradually gradually, and be a stationary value that is provided with in advance in the entrucking process, thus the time of guaranteeing entrucking, raising entrucking efficient; And beginning and the flow gradual change when finishing can realize effectively cooling off LNG entrucking arm (or flexible pipe), avoid the percussion of LNG to tank car, make the entrucking process more steadily with reliable; Batch controller can calculate needed loading time automatically according to the volume of tank car in the release of the LNG tank car that gets into the tank car loading station, and adjusts the time of flow control opening of valves automatically.
For example, above-mentioned loading system also comprises: liquid level detector, and be arranged on the LNG tank car and and be electrically connected with batch entrucking controller, the liquid level signal of the LNG tank car of its detection is passed to entrucking controller in batches; Wherein, when liquid level signal surpassed predefined numerical value, the entrucking controller sent alarm signal in batches, and the interlocking close flow control valve, can effectively avoid the LNG tank car to overcharge.
For example, above-mentioned loading system also comprises: first temperature indicating instrument, be arranged on the LNG entrucking pipeline, and measure and show the temperature of LNG entrucking pipeline, and the temperature that ought record is higher than the predefined upper limit.
Claims (10)
1. a LNG Liquefied natural gas loading system is characterized in that, comprising:
LNG entrucking house steward is connected with the LNG storage tank, and the LNG in the said LNG storage tank is delivered to loading station;
LNG entrucking pipeline is arranged on loading station, is connected with said LNG entrucking house steward, LNG is delivered to the coupled entrucking arm that connects the LNG tank car is carried out entrucking;
The BOG return arm is connected with said LNG tank car;
The BOG pipeline is connected with said BOG return arm;
House steward BOG is connected with said BOG pipeline, will be delivered to the gas-phase space or the BOG processing system of LNG storage tank by the BOG that said LNG tank car returns;
Flow measurement instrument and flow control valve are separately positioned on the said LNG entrucking pipeline, and are electrically connected with batch entrucking controller respectively;
Said batch entrucking controller is connected with release on the LNG tank car, the opening and closing of the said flow control valve of flow control of the LNG that records according to the volume of the LNG tank car that writes down in the said release, said flow measurement instrument.
2. system according to claim 1 is characterized in that, also comprises:
Liquid level detector is arranged on the LNG tank car and with said batch entrucking controller and is electrically connected, and the liquid level signal of the LNG tank car of its detection is passed to said batch entrucking controller;
Wherein, when said liquid level signal surpassed predefined numerical value, said batch entrucking controller sent alarm signal, and the said flow control valve of interlocking close.
3. system according to claim 1 is characterized in that, also comprises:
First temperature indicating instrument is arranged on the said LNG entrucking pipeline, measures and show the temperature of said LNG entrucking pipeline, and when the temperature that records is higher than predefined CLV ceiling limit value, sends alarm signal.
4. system according to claim 1 is characterized in that, also comprises:
The first pressure indicating meter is arranged on the said LNG entrucking pipeline, measures and shows the pressure in the said LNG entrucking pipeline, and when the pressure that records is higher than predefined CLV ceiling limit value, send alarm signal.
5. system according to claim 1 is characterized in that said batch controller also has the flux cumulating function of measuring, and the LNG amount of accumulative total entrucking in a period of time is noted also teletransmission to server.
6. system according to claim 1 is characterized in that, also comprises:
Pressure controlled valve and pressure measuring instruments are separately positioned on the said BOG pipeline.
7. system according to claim 1 is characterized in that, also comprises:
Second temperature indicating instrument is arranged on the said BOG pipeline, measures and show the temperature of said BOG pipeline, and when the temperature that records is higher than predefined CLV ceiling limit value, sends alarm signal.
8. system according to claim 1 is characterized in that, also comprises:
The second pressure indicating meter is arranged on the said BOG pipeline, measures and shows the pressure in the said BOG pipeline, and when the pressure that records is higher than predefined CLV ceiling limit value, send alarm signal.
9. according to each described system among the claim 1-8, it is characterized in that, adopt LNG entrucking flexible pipe and BOG to return flexible pipe and replace said LNG entrucking arm and said BOG return arm respectively.
10. a LNG Liquefied natural gas entrucking method is characterized in that, may further comprise the steps:
LNG entrucking house steward through being connected with the LNG storage tank is delivered to loading station with the LNG in the said LNG storage tank;
Through the LNG entrucking pipeline that is arranged on loading station and is connected LNG is delivered to the coupled entrucking arm that connects the LNG tank car is carried out entrucking with said LNG entrucking house steward;
The BOG that is returned by the LNG tank car is through being delivered to the gas-phase space or the BOG processing system of LNG storage tank with BOG return arm, BOG pipeline and house steward BOG that the LNG tank car links to each other successively;
Wherein, said LNG entrucking pipeline is provided with flow measurement instrument and flow control valve, and said flow measurement instrument and said flow control valve are electrically connected with batch entrucking controller respectively; Said batch entrucking controller is connected with release on the LNG tank car, the opening and closing of the said flow control valve of flow control of the LNG that records according to the volume of the LNG tank car that writes down in the said release, said flow measurement instrument.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110332308.2A CN102392935B (en) | 2011-10-27 | 2011-10-27 | Liquefied natural gas loading system and method |
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| CN201110332308.2A CN102392935B (en) | 2011-10-27 | 2011-10-27 | Liquefied natural gas loading system and method |
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| CN102392935B CN102392935B (en) | 2014-07-30 |
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Cited By (5)
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| CN102937240A (en) * | 2012-10-26 | 2013-02-20 | 西安东风机电有限公司 | Back pressure control method and application system for liquefied gas loading |
| CN103552971A (en) * | 2013-11-06 | 2014-02-05 | 江苏丽天石化码头有限公司 | Piping exchange station used for oil depot tank field cargo access system |
| CN106641732A (en) * | 2017-02-24 | 2017-05-10 | 中国石油天然气集团公司 | Product oil loading metering adjusting device |
| CN106895262A (en) * | 2017-02-24 | 2017-06-27 | 中国石油天然气集团公司 | A kind of flow regulator and flow rate adjusting method for product oil entrucking |
| CN107906369A (en) * | 2017-12-20 | 2018-04-13 | 中海石油气电集团有限责任公司 | Defeated system outside a kind of liquefied natural gas receiving station railway |
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| CN102392935B (en) | 2014-07-30 |
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Address after: Two road 100012 Beijing city Chaoyang District high tech Industrial Park, No. 1. Patentee after: China Global Engineering Co. Ltd. Address before: 100029 Beijing city Chaoyang District cherry Garden Street No. 7 Patentee before: China Huanqiu Engineering Co. |
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Effective date of registration: 20201113 Address after: 100120 Beijing Xicheng District six laying Kang Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CHINA HUANQIU CONTRACTING & ENGINEERING Co.,Ltd. Address before: Two road 100012 Beijing city Chaoyang District high tech Industrial Park, No. 1. Patentee before: CHINA HUANQIU CONTRACTING & ENGINEERING Co.,Ltd. |