CN202252833U - Liquefied natural gas receiving station - Google Patents

Abstract

The utility model discloses a liquefied natural gas receiving station, comprising an LNG (Liquefied Natural Gas) ship-unloading system, an LNG storage system, an LNG pressurizing and gasifying transportation system, a BOG (Boil Off Gas) condensing system, a BOG transportation system and an LNG truck-loading system, wherein the liquefied natural gas receiving station further comprises an LNG ship-loading system; the LNG ship-loading system comprises an LNG ship-loading pump, an LNG ship-loading pipeline, a control valve and a control instrument, an LNG ship-loading arm, a gas returning arm and a gas returning pipeline, wherein the LNG ship-loading pump is installed inside a pump well in an LNG storage pot of the LNG storage system and is used for pressurizing LNG in the storage pot; the LNG ship-loading pipeline is connected between the LNG ship-loading pump and the ship-loading arm and is used for transporting the pressurized LNG to the LNG ship-loading arm; the control valve and the control instrument are arranged on the LNG ship-loading pipeline; the LNG ship-loading arm is connected with an LNG ship and is used for transporting the LNG to the LNG ship; the gas returning arm is connected with the LGN ship and the gas returning pipeline and is used for returning BOG back to the gas returning pipeline from the LNG ship; and the gas returning ship is connected with the LNG storage pot and is used for returning the BOG back to the LNG storage pot.

Description

LNG Liquefied natural gas receiving station

Technical field

The utility model relates to the LNG Liquefied natural gas field, in particular to a kind of LNG Liquefied natural gas receiving station.

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.Because the place of production of LNG is generally away from the user location of LNG; Therefore need to adopt the LNG cargo ship that LNG is transported to land used from the place of production; LNG Liquefied natural gas receiving station is used for receiving the LNG that transport by sea comes, and it is stored and gasifies, to obtain gaseous natural gas (NG; Natural Gas) product, and pass through gas distributing system to power plant and gas user air feed.

Generally; The major function of LNG receiving station is that LNG unloads a ship, LNG stores, the LNG gasification is outer defeated; Some receiving station also is provided with LNG tank car entrucking function; The user that the LNG that LNG receiving station is stored does not extremely lay natural gas line through the tank car shipment perhaps is transported to the LNG gas station, is used for the fuel of LNG automobile.LNG loads onto ship, LNG unloads function, when needs are loaded onto ship and unload, just can not realize, has limited the range of operation and the adaptive capacity of LNG receiving station but present LNG receiving station does not comprise.

The model utility content

The utility model provides a kind of LNG Liquefied natural gas receiving station, in order to improve the range of operation and the adaptive capacity of LNG receiving station.

For achieving the above object; The utility model provides a kind of LNG Liquefied natural gas receiving station; It comprises LNG ship-unloading system, LNG stocking system, LNG pressurization and the outer communication system of gasification, BOG condenser system, the outer communication system of BOG and LNG loading system; Also comprise the LNG ship-loading system, wherein, the LNG ship-loading system comprises:

LNG loads pump onto ship, is installed in the pump sump of LNG tank inside of LNG stocking system, and the LNG in the storage tank is pressurizeed;

LNG loads pipeline onto ship, is connected between LNG shipment pump and the shipment arm, and the LNG that pressurizes is delivered to LNG shipment arm;

Control valve and control instrument are arranged on the LNG shipment pipeline;

LNG loads arm onto ship, is connected with the LNG ship, and LNG is delivered to the LNG ship;

The return-air arm is connected LNG ship and vapor return line, and BOG is back to vapor return line by the LNG ship;

Vapor return line is connected with the LNG storage tank, BOG is returned be delivered to the LNG storage tank.

Preferable, the number of LNG shipment arm is 1-2.

Preferable, the LNG storage tank is provided with a LNG shipment pump at least.

Preferable, above-mentioned LNG Liquefied natural gas receiving station also comprises: the LNG unloading system, and wherein, the LNG unloading system comprises:

The supercharging device of unloading is connected with the gas phase mouth of LNG tank car;

The flexible pipe of unloading is connected with the liquid phase mouth of LNG tank car;

The LNG collecting tank is connected with the flexible pipe of unloading, and receives the LNG that is transported by the flexible pipe of unloading.

The foregoing description, can be realized quickly and safely when needs are loaded onto ship and unload through increasing LNG ship-loading system and LNG unloading system in LNG receiving station, improve the range of operation and the adaptive capacity of LNG receiving station.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment 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 utility model, 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 utility model one embodiment's the LNG Liquefied natural gas receiving station schematic representation with ship-loading system;

Fig. 2 is the utility model one embodiment's the LNG Liquefied natural gas receiving station schematic representation with unloading system.

Embodiment

To combine the accompanying drawing among the utility model embodiment below, the technological scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiments.Based on the embodiment in the utility model, 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 utility model protection.

In the embodiment of the utility model, LNG receiving station comprises LNG ship-unloading system, LNG stocking system, LNG pressurization and the outer communication system of gasification, BOG condenser system, the outer communication system of BOG, LNG ship-loading system, LNG loading system, LNG unloading system.

The LNG ship-unloading system has comprised LNG unload a ship arm, return-air arm, the pipeline of unloading a ship, cold pipeloop, control valve, instrument etc.; After the LNG ship that comes when the ocean arrives the single user wharf of LNG receiving station; The arm of unloading a ship of LNG receiving station (2-4) and return-air arm (1) are connected with discharging header on the LNG ship; Start the discharging pump on the LNG ship, LNG gets into the LNG storage tank successively through discharging header, LNG unloading arm, LNG discharging pipeline on the ship; Realization is unloaded a ship, and LNG is stored in the LNG storage tank.

Unload ship time, since volume displaced, BOG (Boil Off Gas) gas need from the LNG storage tank, be returned; Replenish the gas-phase space in the LNG cargo ship; Avoid hypotony, vacuum phenomenon occurs, cause the vacuum breaking of the LNG storage tank in the LNG cargo ship; Therefore, BOG enters into the LNG storage tank on the LNG ship through BOG pipeline, return-air arm; Do not unload ship time, keep the cold conditions of the pipeline of unloading a ship, avoid temperature variation to cause a large amount of LNG evaporations, reduce LNG simultaneously and unload a ship working life of pipeline through cold pipeloop; Ship-unloading system is used for the discharging of the next Large LNG cargo ship in ocean, and the ship volume is at 140000m ³More than.

The LNG stocking system comprises the LNG storage tank, and (more than two, storage volume is at 2x150000m ³More than), up and down each one of discharge pipe, respectively install on it switch valve (and the bypath valve of diameter 50mm is set, keep normally open), BOG turnover pipeline, low-pressure delivery pump install pump sump, level monitoring and indicating meter, temperature monitoring and indicating meter, pressure monitoring and indicating meter, liquid level temperature and measuring density and indicating meter, annular space and in pot bottom leakage monitoring indicating meter, storage tank cool off monitor temperature instrument, annular space oxygen concentration analytical sampling mouth first, nitrogen purges and displacement mouth, drain, superpressure safety valve, vacuum breaker safety valve, pearlife filling mouth etc.; The LNG storage tank adopts the double layer construction that contains jar, reinforced concrete tank deck in outer jar of prestressed concrete, 9% nickel steel entirely; Filling pearlife between inside and outside jar the tank skin; Lay foam glass brick between the inside and outside pot bottom, interior jar is adopted ceiling structure, and outer jar is adopted vault construction; An inside and outside jar gas-phase space communicates, and lays blanket insulation above the furred ceiling; Interior jar is used for taking up LNG, and outer jar is used for bearing gaseous pressure and protects thermoinsulation material, and LNG will be discharged into the LNG storage tank from LNG cargo ship or LNG tank car by the pipeline of unloading a ship; The BOG gas that produces between the storage life is provided with pressure control valve through the output of BOG pipeline on the BOG pipeline, and its opening state is by the pressure control of LNG storage tank; When pressure surpasses predefined pressure; This control valve is opened, and over-pressure gas is disposed to torch burning through the BOG pipeline, and protection LNG storage tank does not destroy because of superpressure; Under the normal condition, the pressure of storage tank is controlled by the operating load of BOG compressor; When pressure of storage tank reaches the setting pressure of pressure relief valve, the pressure security opening of valves, over-pressure gas is through safety valve discharging atmosphere; When the pressure in the storage tank is lower than predefined low-pressure, open the vacuum breaker pressure controlled valve, the rock gas in the external world is supplemented in the storage tank; Abolish the vacuum possibility in the storage tank; When the pressure in the storage tank reached the unlatching setting value of vacuum breaker safety valve, the vacuum breaker safety valve was opened, and air outside gets into storage tank through the vacuum breaker safety valve; Abolish the vacuum in the storage tank, the protection storage tank is not destroyed because of vacuum; Level monitoring in the storage tank and indicating meter are used for measuring the LNG liquid level in the storage tank, and the real-time numerical value of measuring of output, simultaneously when liquid level reaches predefined high value and low value; Output alarm information when liquid level reaches predefined high value, is exported the instruction that stops feed operation; Close the charging valve on the discharging pipeline; When liquid level reached predefined low value, output stopped the instruction of low pressure rear pump, stops the operation of low pressure rear pump; Temperature monitoring and indicating meter are monitored the LNG temperature that stores in the storage tank, and export real-time numerical value; Pressure monitoring and indicating meter are measured the pressure of gas-phase space in the storage tank; Output signal to the controller of BOG compressor; And then the operating load of control BOG compressor; This pressure signal of while also exports the pressure controlled valve of control superpressure discharging torch to and opens to control it, also controls the unlatching of the pressure controlled valve of tonifying Qi, and provides the alarm signal of pressure height; Liquid level, temperature and density (LTD) monitoring and indicating meter are measured the density and the numerical value of temperature at different liquid levels of the LNG in the storage tank in real time; The output signal; When temperature and density when the difference of different liquid levels reaches predefined numerical value, output alarm signal, the LNG in the prompting LNG storage tank exists layering and potential possibility of rolling; Need the operator to take measures necessary; Avoid the LNG in the storage tank to roll, bring a large amount of liquid evaporations, and then cause the destruction of LNG loss and LNG storage tank; Annular space and interior pot bottom leakage monitoring indicating meter are monitored temperature there in real time, and the output signal, when measured value is lower than predefined numerical value, explain that possibly there is leakage in interior jar of LNG storage tank, need the operator to take measures necessary; Storage tank cools off the monitor temperature instrument first and mainly is arranged on interior pot bottom, interior pot sidewall bottom, the furred ceiling;, the LNG storage tank is used for monitoring the temperature changing down of storage tank when cooling off first; Reach the purpose of control storage tank temperature drop, avoid storage tank since temperature to reduce the too fast temperature stress that causes inhomogeneous and then cause the cracking destruction of storage tank; Annular space space oxygen concentration analytical sampling mouth is used for the content of oxygen in the gas in regular sampling analysis annular space space; Avoid that wherein oxygen concentration is too high; Cause an explosion accident, nitrogen replacement process before storage tank comes into operation and vacuum breaker safety valve are opened latter two period and can frequently be used; Nitrogen purges and the displacement mouth is used for connecting the nitrogen that the outside transports, and to realize the inerting of LNG storage tank, realizes storing the condition of combustible substance; Drain uses in storage tank nitrogen replacement process; The over-pressure gas that the superpressure safety valve is used for discharging the LNG storage tank is to atmosphere environment, with the destruction of avoiding storage tank to cause because of superpressure; The vacuum breaker safety valve is used for introducing air from the external world, abolishes the vacuum state of storage tank, causes destruction to avoid storage tank because of vacuum; Pearlife filling mouth is used for to the annular space space filling thermoinsulation material of storage tank; In order to guarantee the Security of LNG storage tank, all process pipelines, instrument pipeline, auxiliary line etc. all connect at roof opening, any opening is not set and is connected instrument at the sidewall and jar end of storage tank.

LNG pressurization and gasification system comprise LNG low-pressure delivery pump, export pipeline, control instrument, control valve, high pressure rear pump, vaporizer, flowmeter, external transport pipeline etc.; LNG low pressure rear pump is installed in the pump sump in the LNG storage tank; Each storage tank is provided with two LNG low pressure rear pumps at least, and every pump has independently pump sump; LNG exports in by the LNG storage tank through LNG low-pressure delivery pump, is transported to three places respectively through pipeline, and the one, after-condenser, another is a LNG high pressure rear pump, and the 3rd is LNG tank car loading system, and three places can be exported simultaneously, also can export separately.High-pressure delivery pump will be delivered to vaporizer after the LNG pressurization from after-condenser and low-pressure delivery pipeline; LNG heating and gasifying in vaporizer is rock gas (NG); Be delivered in the flowmeter through pipeline then and measure, export receiving station through external transport pipeline as gas product at last.

The BOG condenser system comprises after-condenser, pipeline, instrument, control valve etc.; Be transported in the after-condenser through pipeline from the BOG after the pressurization of BOG compressor; Directly contact with LNG from LNG low pressure rear pump; Realize the condensation of BOG, become the higher slightly LNG of temperature, be delivered to LNG high pressure rear pump through pipeline then.

The outer communication system of BOG comprises BOG compressor, pipeline, instrument, control valve, flowmeter etc.; BOG is from the LNG storage tank; Being delivered to the BOG compressor with pipeline pressurizes; Be delivered to two places then respectively, carry as product to the low-pressure line in the external world through pipeline the metering back, also can be delivered to and realize condensation in the after-condenser.

The LNG ship-loading system comprises LNG shipment pump, pipeline, control valve, control instrument, shipment arm, return-air arm etc.LNG shipment pump is installed in the pump sump of LNG tank inside; Each storage tank is provided with a LNG shipment pump at least; LNG shipment pump is delivered to LNG shipment arm with the pressurization of the LNG in the storage tank through LNG shipment pipeline, and LNG shipment arm (1-2) is connected with the LNG ship; And through shipment arm realization LNG shipment operation, control valve and control instrument are arranged on the LNG shipment pipeline.Owing to volume displaced, need the BOG in the LNG ship be back to the LNG storage tank in the shipment process, BOG is connected with LNG through return-air arm (1), vapor return line; Realize that BOG returns the LNG storage tank; Keep the pressure balance in the shipment process, when not loading onto ship, adopt cold pipeloop to keep the cold conditions of shipment pipeline; Avoid temperature variation to cause a large amount of LNG evaporations, the working life of reducing LNG shipment pipeline simultaneously; The LNG shipment is used to adorn some less relatively LNG ships, like 40000m ³Below, these ships only carry out the short distance transportation in the inland river.

In the foregoing description, when the rock gas in being stored in rock gas receiving station storage tank needs shipped, can realize the shipped of LNG having improved the range of operation and the adaptive capacity of LNG receiving station through the LNG ship-loading system.

The LNG loading system comprises pipeline, control valve, control instrument, entrucking arm, return-air arm etc.; LNG entrucking pipeline is connected with LNG low pressure export pipeline, will be delivered to LNG entrucking arm through this pipeline from the LNG of LNG storage tank, realizes LNG entrucking function; Owing to volume displaced, need the BOG in the LNG tank car be back to the LNG storage tank in the entrucking process, BOG is connected with the LNG storage tank through return-air arm, vapor return line; Realize that BOG returns the LNG storage tank; Keep the pressure balance in the entrucking process, during not entrucking, adopt cold pipeloop to keep the cold conditions of entrucking pipeline; Avoid temperature variation to cause a large amount of LNG evaporations, the working life of reducing LNG entrucking pipeline simultaneously.In addition, for improving entrucking efficient, many jack works positions can be set.

The LNG unloading system comprises the hose coupling of unloading, LNG collecting tank, supercharging unload device, control valve, control instrument etc.; The liquid phase mouth of LNG tank car is connected with the flexible pipe of unloading; The unload gas phase mouth of device of gas phase mouth and supercharging is connected; Through the unload gaseous pressure of device of supercharging the LNG in the LNG tank car is unloaded to the LNG collecting tank through the flexible pipe of unloading; Realize the LNG process of unloading, after the LNG tank car leaves LNG receiving station, the LNG in the LNG collecting tank is being imported the LNG storage tank; This unloading system is only as in emergency circumstances using, and fault occurred like the LNG tank car of some entruckings, can not transport, and needs repairing, and interim the requirement draws off the LNG in the car, thereby improved the range of operation and the adaptive capacity of LNG receiving station.Generally speaking, the most operation of LNG receiving station is a LNG entrucking process.

Fig. 1 is the utility model one embodiment's the LNG Liquefied natural gas receiving station schematic representation with ship-loading system; Fig. 2 is the utility model one embodiment's the LNG Liquefied natural gas receiving station schematic representation with unloading system.Wherein, the pipeline on the left side pipeline of Fig. 2 and Fig. 1 right side is interconnective.In Fig. 1 and Fig. 2, pipeline 1 is the low pressure delivery trunk, and pipeline 2 is the house steward that unloads a ship, and pipeline 3 is the gas phase return line, and pipeline 4 is not for there being the cold pipeloop of unloading a ship, and pipeline 5 is house steward BOG; L-1101A～C is the LNG arm of unloading a ship, and L-1103A～B is a LNG shipment arm, and L-1102, L-1104 are the gas phase return arm; P-1201A～C, P-1202A～C are the low-pressure delivery pump, and P-1203, P-1204 are LNG shipment pump, and C-1301 is the BOG compressor; P-1401 is the high pressure rear pump, and U-1901 is a torch, and T-1201, T-1202 are the LNG storage tank; V-1301 is an after-condenser, and V-1302 is a BOG suction port of compressor knock out drum, and E-1501 is open-shelf vaporizer; E-1601 is the submerged combustion vaporizer, and U-3001 is tank car entrucking arm and gas phase return arm.

Among the figure, A, B, D, E, be respectively the signal tie point, PC is a pressure control, and FC is flow control, and PT is a pressure transducer, and FQIC is flow control (implicating the meter function), and FX is that flow computing module, LIC are liquid level control.

One of ordinary skill in the art will appreciate that: accompanying drawing is an embodiment's a schematic representation, and module in the accompanying drawing or flow process might not be that enforcement the utility model is necessary.

One of ordinary skill in the art will appreciate that: the module in the device among the embodiment can be described according to embodiment and be distributed in embodiment's the device, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.

What should explain at last is: above embodiment is only in order to the technological scheme of explanation the utility model, but not to its restriction; Although the utility model has been carried out detailed explanation with reference to previous embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technological scheme that previous embodiment is put down in writing, and perhaps part technical characteristics wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of essence disengaging the utility model embodiment technological scheme of relevant art scheme.

Claims (4)

1. LNG Liquefied natural gas receiving station; Comprise LNG ship-unloading system, LNG stocking system, LNG pressurization and the outer communication system of gasification, BOG condenser system, the outer communication system of BOG and LNG loading system, it is characterized in that, also comprise the LNG ship-loading system; Wherein, said LNG ship-loading system comprises:

LNG loads pump onto ship, is arranged in the pump sump of LNG tank inside of LNG stocking system, and the LNG in the storage tank is pressurizeed;

LNG loads pipeline onto ship, is connected between said LNG shipment pump and the shipment arm, and the LNG that pressurizes is delivered to said LNG shipment arm;

Control valve and control instrument are arranged on the said LNG shipment pipeline;

Said LNG shipment arm is connected with the LNG ship, and LNG is delivered to the LNG ship;

The return-air arm is connected said LNG ship and vapor return line, and BOG is back to said vapor return line by said LNG ship;

Said vapor return line is connected with said LNG storage tank, BOG is returned be delivered to said LNG storage tank.

2. LNG Liquefied natural gas according to claim 1 receiving station is characterized in that, the number of said LNG shipment arm is 1-2.

3. LNG Liquefied natural gas according to claim 1 receiving station is characterized in that, said LNG storage tank is provided with a LNG shipment pump at least.

4. LNG Liquefied natural gas according to claim 1 receiving station is characterized in that, also comprises: the LNG unloading system, and wherein, said LNG unloading system comprises:

The supercharging device of unloading is connected with the gas phase mouth of LNG tank car;

The flexible pipe of unloading is connected with the liquid phase mouth of said LNG tank car; The LNG collecting tank is connected with the said flexible pipe of unloading, and receives the LNG that is transported by the said flexible pipe of unloading.

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