CN106481972A - Gas station and its power set and control method - Google Patents

Abstract

The invention provides a kind of gas station and its power set and control method, this power set includes：Suction flow container and Pneumatic adjusting mechanism, the inlet of suction flow container is connected with the first leakage fluid dram of fluid reservoir, the leakage fluid dram of suction flow container is connected with liquid filler, and the air inlet of suction flow container and high pressure mechanism of supplying gas is connected, and the air vent of suction flow container is connected with low pressure exhaust mechanism；In first state, the leakage fluid dram of suction flow container is disconnected with liquid filler, and the air inlet of suction flow container and high pressure mechanism of supplying gas disconnects, and the air vent of suction flow container is communicated with low pressure exhaust mechanism, and the inlet of suction flow container is connected with the first leakage fluid dram of fluid reservoir；In the second state, the inlet of suction flow container is disconnected with the first leakage fluid dram of fluid reservoir, and the air vent of suction flow container is disconnected with low pressure exhaust mechanism, and the leakage fluid dram of suction flow container is communicated with liquid filler, and the air inlet of suction flow container is supplied gas with high pressure and communicated between mechanism.This power set can replace immersed pump, reduces cost, reduces maintenance cost.

Description

Gas station and its power set and control method

Technical field

The present invention relates to a kind of LNG (Liquefied Natural Gas, liquefied natural gas) aerating technology, It is related specifically to a kind of gas station and its power set and control method.

Background technology

Currently, natural gas has been widely used in society, the many aspects of life.Wherein, using natural Gas, as fuel, drives the operating of other equipment to have become as an importance of gas utilization.In order to Convenient transport and load, by natural gas liquefaction is formed liquefied natural gas (Liquefied Natural Gas, LNG), have become as one of important way of gas utilization.

In order to expand the range of LNG, currently it is usually taken and LNG aerating is set in predetermined position The mode stood, predetermined position be long-distance transport heavy truck, buses or other treat aerating equipment aerating.

LNG gas station typically mainly include fluid reservoir, with the fluid filling pump sledge of immersed pump, liquid filler ( Claim liquid filler, filling machine), BOG (flash steam) retracting device and control device.Wherein, liquid filler is used In directly to automobile or other treat aerating equipment aerating, general BOG retracting device includes storing BOG's Surge tank, compressor or pressure regulating metering device etc., compressor is directly compressed into suitable sky the BOG reclaiming So automobile-used CNG of gas (Compressed Natural Gas), and by filling machine directly to automobile or other treat Aerating equipment fills CNG；

The LNG of storage scheduled volume in fluid reservoir, and the pressure of the LNG in fluid reservoir is relatively low, and liquid filler The LNG pressure needing is higher, and therefore, the LNG in fluid reservoir can pass through fluid filling pump sledge and predetermined pipe Lu Laixiang liquid filler provides the LNG with predetermined pressure meeting liquid filler standard；Fluid filling pump sledge is also used for Unload for LNG transport vehicle and be filled into LNG storage tank；Control device is used for controlling the break-make of predetermined pipeline, To realize the control of whole liquid feeding process.

In whole LNG gas station, fluid filling pump sledge is the core component of whole gas station, for for liquid feeding System provides power.The core component of wherein fluid filling pump sled is immersed pump, in order to improve the liquid feeding energy of gas station Power, can also arrange multiple immersed pumps, come for one or more liquid fillers with predetermined pressure and flow feed flow.

At present, there is the LNG gas station of three kinds of specifications on the market：First order station, secondary station and three-level station, one As, three-level station equipped with single two liquid fillers of pump sledge, secondary station equipped with four liquid fillers of a double pump sledge, One immersed pump is two liquid filler feed flows.

Immersed pump is that one kind specially designs the centrifugal latent liquid that (- 162 DEG C) work under ultra low temperature state Pump, working condition requires harsh, and rotating speed is high, lift is low, by LNG hydrodynamic lubrication, in use Easily damage, belong to consumable accessory, and relative cost is very high, in the case of double pump sledge, immersed pump accounts for whole More than the 50% of individual fluid filling pump sledge manufacturing cost.Domestic immersed pump market is mainly by two international vendors at present Monopolization, also possibility does not break this monopolization situation to the like product of domestic production in a short time.

Additionally, LNG is a kind of material of easily gasification, it is difficult in use avoid the product of BOG Raw, in the case of not having corresponding BOG reclaimer, natural gas has to discharge into the atmosphere, both dirty Contaminate air, cause very big economic loss again.In terms of LNG gas station is using aspect, BOG reclaims Most convenient is to become to be suitable for the CNG of gas-fueled vehicles use by compressor compresses with most economical method, leads to Crossing CNG filling machine is refueling.

Additionally, technically, LNG immersed pump role and its limited in whole refueling system. See to the full extent, immersed pump also only increases LNG 7-10 kilogram of pressure on pressure of foundation, but The affiliated facility producing because of it and the BOG loss producing are the maximum disadvantages of this kind of design, are also this area Technical barrier.

Content of the invention

It is an object of the invention to provide a kind of gas station and its power set and control method, can solve existing LNG gas station is had in technology to adopt immersed pump as feed flow power-equipment, existing manufacturing cost is high, The technical problems such as use and maintenance cost height.

Technical scheme provided by the present invention is as follows：

A kind of power set, for being delivered to liquid filler by the liquefied natural gas in gas station fluid reservoir；Described Power set include：

Suction flow container, the tank body of described suction flow container is provided with air inlet, air vent, inlet and leakage fluid dram, The inlet of described suction flow container is connected with the first leakage fluid dram of fluid reservoir, the leakage fluid dram of described suction flow container with Liquid filler is connected；And,

Pneumatic adjusting mechanism, described Pneumatic adjusting mechanism includes high pressure and supplies gas mechanism and low pressure exhaust mechanism, institute State high pressure mechanism of supplying gas to be connected with the air inlet of described suction flow container, described low pressure exhaust mechanism and described suction The air vent of flow container is connected；

Wherein, described suction flow container has first state and second state of mutual switching,

In described first state, the inlet of described suction flow container is communicated with the first leakage fluid dram of fluid reservoir, institute The air vent stating suction flow container is communicated with described low pressure exhaust mechanism, the leakage fluid dram of described suction flow container and liquid feeding Machine disconnects, and the air inlet of described suction flow container and described high pressure mechanism of supplying gas disconnects, so that described suction flow container Pressure reaches the first predetermined pressure, and from fluid reservoir imbibition；

In described second state, the inlet of described suction flow container is disconnected with the first leakage fluid dram of fluid reservoir, institute State the air vent of suction flow container and the separated of described low pressure exhaust mechanism, the leakage fluid dram of described suction flow container with Communicate between liquid filler, the air inlet of described suction flow container is supplied gas with described high pressure and communicated between mechanism, so that The pressure of described suction flow container reaches the second predetermined pressure, and to liquid filler discharge opeing.

Further, described suction flow container at least two, and wherein at least one suction flow container is in described During first state, at least another suction flow container is in described second state, so that at least two liquid sucking-dischargings Tank can be continuously to liquid filler feed flow.

Further, described Pneumatic adjusting mechanism includes：

One low-pressure tank group, including at least one low-pressure tank, described low-pressure tank is provided with air inlet pipeline；

One compressor, described low-pressure tank is connected with the input port of described compressor；And,

One pressure pan group, including at least one pressure pan, described pressure pan is connected with the delivery outlet of described compressor Connect；

Wherein, described pressure pan group is provided with gas exhaust piping, described gas exhaust piping pass through pressure-regulating valve with The air inlet of described suction flow container is connected, and forms described high pressure and supply gas mechanism.

Further, the air inlet pipeline of described low-pressure tank group can pass through pressure-regulating valve and booster gasification apparatus And the second leakage fluid dram with fluid reservoir, the fortune tank being located on gas transportation vehicle, the air vent of fluid reservoir and gas station One or more of flash steam floss hole connect.

Further, the air inlet pipeline of described low-pressure tank group and the gas exhaust piping of described pressure pan group also set It is equipped with check valve.

Further, the air inlet pipeline of described low-pressure tank group is connected with the air vent of described suction flow container, and shape Become described low pressure exhaust mechanism.

Further, liquid level detector, pressure detector and temperature inspection are additionally provided with described suction flow container Survey device.

A kind of gas station, including：

For storing the fluid reservoir of liquefied natural gas；

For to the liquid filler treating aerating equipment filling liquefied natural gas；

And, for the liquefied natural gas in fluid reservoir being delivered to the power set of described liquid filler, described Power set adopt power set as above.

Further, described gas station also includes：

One control device, for according to predetermined strategy, controlling described suction flow container in described first state and Mutually switch between described second state.

Further, described control device can also control at least one suction flow container according to predetermined strategy When being in described first state, at least another suction flow container is controlled to be in described second state, so that extremely Few two suction flow containers can be continuously to liquid filler feed flow.

Further, described control device includes：

Receiving unit, for obtaining the liquid level detector on described suction flow container, pressure detector and temperature inspection Survey the data that device is gathered, and generate testing result；

First processing units, for receiving the testing result of described receiver module, and when described testing result is Described suction flow container current level value is less than the first default level value and/or described suction flow container current pressure values When reaching the first predetermined pressure, generate the first control signal；

First performance element, for when receiving the first control signal that described first processing units send, The inlet of described suction flow container is controlled to communicate with the first leakage fluid dram of fluid reservoir, the aerofluxuss of described suction flow container Mouth is communicated with described low pressure exhaust mechanism, and the leakage fluid dram of described suction flow container is separated with liquid filler, described The air inlet of suction flow container and described high pressure are supplied gas and are disconnected between mechanism, so that described suction flow container is from fluid reservoir Imbibition；

Second processing unit, for receiving the testing result of described receiver module, and when described testing result is Described suction flow container current level value is higher than the second default level value and/or described suction flow container current pressure values When reaching the second predetermined pressure, generate the second control signal；

Second performance element, for when receiving the second control signal that described second processing unit sends, The inlet of described suction flow container is controlled to disconnect with the first leakage fluid dram of fluid reservoir, the aerofluxuss of described suction flow container Mouth is separated with described low pressure exhaust mechanism, communicates between the leakage fluid dram of described suction flow container and liquid filler, The air inlet of described suction flow container is supplied gas with described high pressure and is communicated between mechanism, so that liquid in described suction flow container Change the backward liquid filler discharge opeing of natural gas boosting.

A kind of control method of gas station, described gas station is gas station as above, and methods described includes： Control the step to charging machine transportation of liquefied natural gas for the fluid reservoir；Described control fluid reservoir conveys liquid to charging machine The step changing natural gas specifically includes：

Step S1：According to predetermined strategy, control the inlet of suction flow container and the first discharge opeing of fluid reservoir Mouth communicates, and the air vent of described suction flow container is communicated with described low pressure exhaust mechanism, the row of described suction flow container Liquid mouth and liquid filler disconnect, and the air inlet of described suction flow container and described high pressure mechanism of supplying gas disconnects, so that institute The pressure stating suction flow container reaches the first predetermined pressure, and is less than the pressure of fluid reservoir, from fluid reservoir imbibition；

Step S2：After completing step S1, according to predetermined strategy, control the inlet of suction flow container Disconnect with the first leakage fluid dram of fluid reservoir, the air vent of described suction flow container is disconnected with described low pressure exhaust mechanism, The leakage fluid dram of described suction flow container is communicated with liquid filler, and the air inlet of described suction flow container and described high pressure are supplied gas Mechanism communicates, so that the pressure of described suction flow container reaches the second predetermined pressure, and reaches required for liquid filler Pressure, to liquid filler discharge opeing, and after discharge opeing completes, be back to step S1.

Further, in the process, when described suction flow container at least two, control wherein at least During one suction flow container execution step S1, control at least another suction flow container execution step S2, so that At least two suction flow containers can be continuously to liquid filler feed flow.

Further, in methods described, step S1 specifically includes：

Step S11, the liquid level detector obtaining on suction flow container, pressure detector and temperature detector are adopted The data of collection；

Step S12, when described testing result be that described suction flow container current level value is less than the first default liquid level When value and/or described suction flow container current pressure values reach the first predetermined pressure, control described suction flow container Inlet is communicated with the first leakage fluid dram of fluid reservoir, the air vent of described suction flow container and described low pressure exhaust machine Structure communicates, and the leakage fluid dram of described suction flow container is separated with liquid filler, the air inlet of described suction flow container with Described high pressure is supplied gas and is disconnected between mechanism, so that described suction flow container is from fluid reservoir imbibition.

Further, in methods described, step S2 specifically includes：

Step S21, the liquid level detector obtaining on suction flow container, pressure detector and temperature detector are adopted The data of collection；

Step S22, when described testing result be described suction flow container current level value be higher than the second default liquid level When value and/or described suction flow container current pressure values reach the second predetermined pressure, control described suction flow container Inlet and the first leakage fluid dram disconnection, the air vent of described suction flow container and the described low pressure exhaust machine of fluid reservoir Structure disconnects, and the leakage fluid dram of described suction flow container communicated with liquid filler, the air inlet of described suction flow container with described High pressure mechanism of supplying gas communicates so that in described suction flow container liquefied natural gas supercharging backward liquid filler discharge opeing.

Further, described method also includes：Control fortune tank to transportation of liquefied natural gas in fluid reservoir Step；Described control fortune tank specifically includes to the step of transportation of liquefied natural gas in fluid reservoir：

Step S31, control fortune tank are communicated with booster gasification apparatus, by liquefied natural gas in fortune tank through increasing After gasifying device of calming the anger pressurization, return again to fortune tank；

Step S32, after completing step S31, booster gasification apparatus and fortune tank is separated, will Second leakage fluid dram of described fluid reservoir is connected with fortune tank, makes the liquefied natural gas in fortune tank be delivered to liquid storage In tank.

Beneficial effects of the present invention are as follows：

Power set provided by the present invention, can replace immersed pump, and be that LNG liquid is pressurized and keeps The hydraulic force setting, the LNG in fluid reservoir is delivered in liquid filler, i.e. it can not have In the case of immersed pump, while providing identical LNG gas supply capacity for gas station, reduce overall building a station Cost, the maintenance cost reducing in using.

Brief description

Fig. 1 represents the structural representation of the LNG gas station provided in the embodiment of the present invention.

Specific embodiment

Below in conjunction with accompanying drawing, the principle of the present invention and feature are described, example is served only for explaining this Bright, it is not intended to limit the scope of the present invention.

The overall technology such as cost height of building a station are caused to ask in LNG gas station in prior art using immersed pump Topic, the invention provides a kind of power set, can replace immersed pump, by the liquid in the fluid reservoir of gas station Change natural gas in the case of not affecting liquid storage pressure inside the tank, be defeated after refueling system is forced into predetermined pressure Deliver to liquid filler, and under ensureing normal inflating function, reduce manufacturing cost.

It is necessary to in prior art before being described in detail to power set provided by the present invention The fueling process of LNG gas station carries out necessary explanation.

In prior art, LNG gas station is typically by liquefied natural gas with liquefied natural gas (LNG), compression Two kinds of forms of natural gas (CNG) supply to automobile or other treat aerator.The LNG of storage in fluid reservoir Pressure and temperature ratio relatively low, need by fluid filling pump sledge (immersed pump) and predetermined pipeline to LNG plus After being depressed into predetermined pressure, feed flow to liquid filler, and by high plunger displacement pump, high pressure gasifier, gas bomb group And filling machine, as natural gas vehicle refueling in the form of CNG.

Power set provided by the present invention, its first purpose is it is simply that can replace of the prior art latent Liquid pump, the LNG in fluid reservoir is forced into and meets liquid filler required pressure, with predetermined amount of flow to liquid feeding Machine liquid feeding.

Power set provided by the present invention, its second purpose is it is simply that can rationally utilize BOG to reclaim Device, by BOG carry out reasonably using and timely reclaim.

Just power set provided by the present invention are described in detail below.

As shown in figure 1, power set provided by the present invention mainly include suction flow container 100 and air pressure adjustment Mechanism, the tank body of wherein said suction flow container 100 is provided with air inlet, air vent, inlet and leakage fluid dram, Pass through the first control valve group between the inlet of described suction flow container 100 and the first leakage fluid dram of fluid reservoir 10 201 are connected, and pass through the second control valve group 202 between the leakage fluid dram of described suction flow container 100 and liquid filler 20 It is connected；Described Pneumatic adjusting mechanism includes supplying gas for the high pressure to conveying high-pressure gas in suction flow container 100 Mechanism and the low pressure exhaust mechanism for discharging gas in suction flow container 100, and, high pressure supplies gas mechanism Air pressure be more than suction flow container 100 in pressure, and the air pressure of low pressure exhaust mechanism be less than suction flow container 100 Internal gas pressure, described high pressure is supplied gas and is passed through the 3rd control valve between mechanism and the air inlet of described suction flow container 100 Group 203 is connected, and passes through the 4th and control between the air vent of described low pressure exhaust mechanism and described suction flow container 100 Valve group 204 processed is connected；

Described suction flow container 100 has first state and second state of mutual switching,

Pass through described between described first state, the leakage fluid dram of described suction flow container 100 and liquid filler 20 Second control valve group 202 disconnects, and the air inlet of described suction flow container 100 and described high pressure are supplied gas between mechanism Disconnected by described 3rd control valve group 203, the air vent of described suction flow container 100 and described low pressure exhaust Communicated by the 4th control valve group 204 between mechanism, so that the gas in described suction flow container 100 reaches One predetermined pressure, then makes the inlet of described suction flow container 100 lead to the first leakage fluid dram of fluid reservoir 10 Cross the first control valve group 201 to connect, imbibition in fluid reservoir 10；

In described second state, the inlet of described suction flow container 100 and the first leakage fluid dram of fluid reservoir 10 Disconnected by the first control valve group 201, the air vent of described suction flow container 100 and described low pressure exhaust mechanism Between disconnected by the 4th control valve group 204, the leakage fluid dram of described suction flow container 100 and liquid filler 20 it Between communicated by described second control valve group 202, the air inlet of described suction flow container 100 and described high force feed Communicated by described 3rd control valve group 203 between mechanism of qi structure, so that the pressure of described suction flow container 100 reaches To the second predetermined pressure, and to liquid filler 20 discharge opeing.

Based on technique scheme, power set provided by the present invention can be connected to fluid reservoir 10 and add Between liquid machine 20, respectively by controlling each control valve group come to suction flow container 100 and fluid reservoir 10, liquid feeding The on off operating mode that machine 20, high pressure are supplied gas between mechanism and low pressure exhaust mechanism is controlled, and to realize suction The switching of flow container 100 two states, wherein,

Cut off the connection that suction flow container 100 and high pressure are supplied gas between mechanism and liquid filler 20, and only by suction When flow container 100 is connected with low pressure exhaust mechanism and fluid reservoir 10, because suction flow container 100 internal gas pressure is big In low pressure exhaust mechanism, and start rapidly to the aerofluxuss of low pressure exhaust mechanism, thus so that suction flow container 100 Internal gas pressure reaches the first predetermined pressure, and described first predetermined pressure is less than the pressure in fluid reservoir, suction flow container There is pressure reduction, thus suction flow container 100 starts imbibition in fluid reservoir 10 between 100 and fluid reservoir；

And cut off the connection between suction flow container 100 and low pressure exhaust mechanism and fluid reservoir 10, and only will inhale When Drainage tank 100 and high pressure supply gas mechanism and liquid filler 20 connects, because high pressure gas mechanism air pressure is high In suction flow container 100 internal gas pressure, and start to conveying high-pressure in suction flow container 100, and until make suction Flow container 100 internal gas pressure reaches the second predetermined pressure, and to the LNG pressurization in suction flow container 100 so that In suction flow container 100, LNG meets liquid filler 20 required pressure, and starts to liquid filler 20 discharge opeing.

Imbibition for suction flow container 100 and draining flow etc., can be by arranging flow on each connecting line Control valve etc. to be controlled according to the actual requirements.

As can be seen here, in the present invention, by controlling each control valve group come to suction flow container 100 and fluid reservoir 10th, the on off operating mode that liquid filler 20, high pressure are supplied gas between mechanism and low pressure exhaust mechanism, you can complete to inhale The imbibition of Drainage tank 100 and discharge opeing action, such that it is able to realize its first purpose, replacing immersed pump will store up LNG in flow container 10 to liquid filler 20, and is substantially reduced gas station and builds a station cost with predetermined pressure feed flow；

And, only need to arrange suction flow container 100, high pressure air feeder between fluid reservoir 10 and liquid filler 20 The parts such as structure, low pressure exhaust mechanism, each control valve group and connecting pipe, you can constitute whole power set, Using complex structure and compared with expensive immersed pump, cost can be substantially reduced with prior art While, structure is simple, is hardly damaged, the life-span greatly prolongs compared to immersed pump, reduces maintenance cost.

It should be noted that in power set provided by the present invention, suction flow container 100 and fluid reservoir 10th, the on off operating mode that liquid filler 20, high pressure are supplied gas between mechanism and low pressure exhaust mechanism can be by each control Valve group processed is being controlled it is also possible to be controlled by miscellaneous part, here is not defined；And And, each control valve group can be manually-operated gate, manually control, to realize suction flow container 100 two kinds The switching of state；Additionally, each control valve group preferably can adopt the electronic control valves such as pneumatic control valve, profit According to predetermined strategy, the working condition of each control valve group is controlled with control device, and realizes liquid sucking-discharging The automatic switchover of the two states of tank 100；Or, each control valve group can also be hand-operated valve and Electronic Control The combination of valve, both can carry out Non-follow control, can automatically control again.

It should be noted that, power set provided by the present invention can be applied not only in LNG gas station, Other occasions that will export after liquid pressing to preset pressure can also be applied to, for example：This power set is also The high-pressure plunger pump in L-CNG system can be replaced provides the LNG with relevant pressure for high pressure gasifier Injection.

It is preferred that as shown in figure 1, described suction flow container 100 in power set provided by the present invention It is provided with least two, and when wherein at least one suction flow container 100 is in described first state, at least separately One suction flow container 100 is in described second state.

That is, in power set, when suction flow container 100 is at least provided with two, each liquid sucking-discharging Tank 100 can alternately execute suction, discharge opeing action, and at least two suction flow containers 100, at least one is held During row imbibition action, another is in execution discharge opeing action.So, so that at least two suction flow containers 100 alternately to liquid filler 20 feed flow, and can realize whole power set and continuously supply to liquid filler 20 The purpose of liquid.

It should be noted that in actual applications, the here such as quantity for suction flow container 100 is not carried out Limitation.The particular number of suction flow container 100 can reasonably be adjusted according to the actual requirements, for example：Inhale The quantity of Drainage tank 100 can also be more than one or two.

And, when the LNG pressure needing on liquid filler 20 is different, suction flow container 100 can be arranged During for two or more, by controlling different suction flow containers 100, LNG can also be forced into different default pressures Power, to provide pressure different LNG for different liquid fillers 20, to meet actual demand.

Furthermore, it is necessary to explanation, in the present invention, the purpose arranging described Pneumatic adjusting mechanism is, There is provided two working pressure conditions for suction flow container 100, carry out imbibition and discharge opeing to form suction flow container 100 Required pressure differential, for the concrete structure of described Pneumatic adjusting mechanism, in actual applications, Ke Yiyou Multiple implementations, only need to meet and provide high pressure and low pressure to get final product it should manage respectively into suction flow container 100 Solution, various be capable of all should be in the guarantor of the present invention to the structure of suction flow container 100 conveying high-pressure and low pressure Within the scope of shield.

Hereinafter provide a kind of preferred structure of Pneumatic adjusting mechanism in a preferred embodiment of the invention.

As shown in figure 1, in the present embodiment, described Pneumatic adjusting mechanism mainly include a low-pressure tank group 300, One compressor 400 and a pressure pan group 500, wherein, described low-pressure tank group 300 includes at least one low pressure Tank, described low-pressure tank is provided with air inlet pipeline；The air vent of described low-pressure tank and described compressor 400 Input port connect；Described pressure pan group 500 includes at least one pressure pan, described pressure pan and described pressure The delivery outlet of contracting machine 400 connects；

Wherein, described pressure pan group 500 is provided with gas exhaust piping, described gas exhaust piping is adjusted by pressure It is connected between valve 900 and the air inlet of described suction flow container 100, and form described high pressure and supply gas mechanism；Institute State and between the air inlet pipeline of low-pressure tank group 300 and the air vent of described suction flow container 100, pass through the first pipeline phase Even, form described low pressure exhaust mechanism.

In such scheme, described Pneumatic adjusting mechanism mainly includes a low-pressure tank group 300, a compressor 400 With a pressure pan group 500, in low-pressure tank group 300, gas can enter pressure pan through after compressor 400 pressurization Group 500, and pressure pan group 500 is connected with the air inlet of suction flow container 100, and it is embodied as suction flow container 100 The purpose of conveying high-pressure gas；In suction flow container 100, gas can be expelled to low-pressure tank group 300 again, and enters Row circulation.It should be appreciated that in actual applications, described high pressure is supplied gas mechanism and low pressure exhaust mechanism Achievable mode is not limited merely to this.

Additionally, LNG is a kind of material of easily gasification, it is difficult in use avoid BOG (flash distillation Vapour) generation, in the case of not having corresponding BOG reclaimer, natural gas must not be not released to air In, both pollute air, cause very big economic loss again.

Based on technical scheme provided above, in order to realize second purpose of power set of the present invention, i.e. Using the BOG recovery system of this gas station, actively by the LNG in the fluid reservoir 10 or LNG on gas transportation vehicle, It is directly low-pressure tank group 500 QI invigorating, thus ensureing that low-pressure tank group has enough natural gass is pressure pan group 500 Supply with CNG filling machine 30, the present invention can also be using technical scheme further below：

Further, as shown in figure 1, described low-pressure tank group 300 air inlet pipeline can also and fluid reservoir The BOG floss hole of 10 the second leakage fluid dram, the air vent of described fluid reservoir 10 and LNG gas station 700 connections, also set up booster gasification apparatus and pressure-regulating valve 900 on the air inlet pipeline of low-pressure tank group 300, Described booster gasification apparatus include：For carrying out to the liquified natural gas before entering described low-pressure tank group 300 The supercharging gasifier 310 of supercharging gasification vaporization；And, before making entrance described low-pressure tank group 300 The heating device 320 that gaseous natural gas heat up.

Described compressor 400 can adopt compound compressor, and its at least one delivery outlet is connected to CNG storage Gas tank group 301, described CNG air accumulator group 301 is connected with filling machine 30.

Using such scheme, as shown in figure 1, the LNG of the second leakage fluid dram output of fluid reservoir 10 can be through After described booster gasification apparatus vaporization, form CNG, the BOG with the air vent from fluid reservoir 10 Together, after then pressurizeing through compressor 400, discharge from one of delivery outlet of compressor, and be high pressure Air accumulator group 500 QI invigorating, the output pressure of another delivery outlet from compressor 400 for remaining gas is permissible Arranging to be the pressure needed for CNG automobile or other equipment aerating, and is conveyed to CNG gas bomb Group 301, CNG filling machine be directly connected to CNG gas bomb group 301, CNG filling machine again with height, in, Low pressure form takes gas from gas bomb group 301.

It should be noted that in such scheme, because the temperature of LNG in fluid reservoir 10 is extremely low, and exceeding The tolerable temperature of each equipment and pipeline in each equipment and power set in gas station, and, usual filling machine 30 supply to automobile or other treat that the CNG of aerating equipment needs to reach predetermined temperature, therefore, above-mentioned side Pass through in case to arrange described heat riser 320 on the air inlet pipeline of described low-pressure tank group 300, can be to low The CNG of the air inlet pipeline of pressure tank group 300 is heated up, on the one hand, prevent entrance low-pressure tank group 300 CNG temperature too low, on the other hand cause equipment components are damaged, it is achieved that by high pressure storage tank Gas temperature in 500 reduces, so that the gas temperature entering suction flow container is as far as possible low, reduces and is inhaling Amount of vaporization in Drainage tank.

Additionally, in power set provided by the present invention, as shown in figure 1, in described first pipeline and institute It is provided with heat exchanger 600, this heat exchanger 600 can be between the outlet pipe stating pressure pan group 500 For connect the first pipeline of suction flow container 100 and low-pressure tank group 300 with for being connected pressure pan group and suction Carry out heat exchange between the outlet pipe of pressure pan group 500 of flow container, with to from pressure pan group 500 to suction In flow container 100, the CNG of conveying is lowered the temperature, and simultaneously to from suction flow container 100 to low-pressure tank group 300 The gas of discharge is heated up.

Such scheme, due to from pressure pan group 500 to suction flow container 100 in conveying CNG temperature be higher than The temperature of LNG in suction flow container 100, can be reduced in pressure pan group 500 by heat exchanger 600 CNG temperature, is allowed to suitable with gas phase temperature in suction flow container 100, and reduces caused by temperature difference not Good impact；Meanwhile, heat exchanger 600 is passed through from the CNG that suction flow container 100 is discharged to low-pressure tank group 300 After intensification, enter back into low-pressure tank group 300, reasonable recycling has been carried out to heat energy.

Based on technical scheme provided above it is achieved that second purpose of power set of the present invention, i.e. close Reason utilizes BOG recovery system, and BOG is reasonably recycled.

Additionally, in the prior art, the fluid reservoir 10 of usual LNG gas station passes through the fortune on gas transportation vehicle Tank is prized to complete to unload using fluid filling pump.On the basis of technical scheme provided above, in order to realize this 3rd purpose of bright power set, i.e. fluid filling pump need not be adopted, but be realized by described power set Unload, therefore, the present invention can also be using technical scheme further below：

Further, as shown in figure 1, in power set provided by the present invention, gasifying in described supercharging It is also associated with device 310 for first pipeline section 401 tank connected with fortune and the second pipeline section 402.When will transport When the fortune tank of gas car is unloaded, it is possible, firstly, to by the water influent pipeline on fluid reservoir 10 by fluid reservoir 10 Communicate so that pressure balance between fluid reservoir 10 and fortune tank with fortune tank；Then, by fluid reservoir 10 Cut off between fortune tank and be connected, and utilize described first pipeline section 401 and described second pipeline section 402 will be pressurized Gasifier 310 is connected with positioned at the fortune tank on gas transportation vehicle so that liquefied natural gas can be through institute in fortune tank After stating supercharging gasifier 310 pressurization, return again to fortune tank, realize fortune tank is pressurized；And will transport Pipeline section 403 between gas tank and fluid reservoir 10 connects, because fortune pressure inside the tank is intrinsic pressure more than fluid reservoir 10 Power, using pressure reduction between the two, you can complete the process of unloading.

Compared with completing using fluid filling pump sled in prior art to unload, entirely the process of unloading can be adopted again With fluid filling pump, but directly can complete the process of unloading using the supercharging gasifier 310 in booster gasification apparatus, Structure is simple, and cost reduces.

Wherein, the water influent pipeline of described first pipeline section 401 and described fluid reservoir 10 is provided with check valve 800, Will not be flowed back with guarantee gas.

It should be noted that as shown in figure 1, process of entirely unloading, can be by being arranged on each connecting line On control valve group carry out the connection status of control piper to realize.

In addition it is also necessary to explanation, the LNG on gas transportation vehicle can also be by whole power set Suction flow container 100 is fluid reservoir 10 liquid feeding, specifically, can pass through to control the break-make of each control valve group, So that when suction flow container 100 execution imbibition action, imbibition in the fortune tank gas transportation vehicle, work as liquid sucking-discharging During tank 100 execution discharge opeing action, to fluid reservoir 10 discharge opeing.

Additionally, based on power set provided above, in order to realize the 4th purpose of power set of the present invention, I.e., it is possible to by the LNG in fortune tank, especially, in fortune tank after completing to unload, remaining LNG enters Row rationally utilizes.As shown in figure 1, work as to need to be directly fed to power set using the LNG in fortune tank When, the first pipeline section 401 that described supercharging gasifier 310 is connected can be connected with fortune tank, and incite somebody to action Second pipeline section 402 disconnects, after the LNG in fortune tank can be with the vaporization of intensified gasifier 310, then warp Heat riser 320 heats up, and enters low-pressure tank group 300, thus be fed directly to suction flow container 100 or Filling machine 30.

Additionally, for the functional reliability ensureing whole power set, as shown in Figure 1 it is preferred that in institute State and be additionally provided with check valve 800 on the air inlet pipeline of low-pressure tank group 300 and the outlet pipe of pressure pan group With pressure-regulating valve 900.Gas backstreaming in pipeline can be prevented by arranging check valve 800；By setting Pressure adjusts 900, can be respectively to the gas and defeated by pressure pan group 500 entering in low-pressure tank group 300 Deliver to the gas in suction flow container 100 and carry out pressure regulation control.

Additionally, as shown in figure 1, can also be set according to practical situation on other connecting lines of power set Put check valve 800 and pressure-regulating valve 900.

Additionally, in power set provided by the present invention, described suction flow container 100 is additionally provided with liquid Bit detector, pressure detector and temperature detector, for detect suction flow container 100 current level value, Temperature and tank internal gas pressure in tank, in order to switch over to the two states of suction flow container 100.Specifically, When the current level value of suction flow container 100 is less than the first default level value and/or described suction flow container 100 is worked as When front pressure value reaches the first predetermined pressure, can be by controlling each control valve group, by suction flow container 100 Switch to first state；And working as described testing result is when described testing result is described suction flow container 100 Current level value is higher than the second default level value and/or described suction flow container 100 current pressure values reach second During predetermined pressure, by controlling each control valve group, suction flow container 100 can be switched to the second state.

A kind of gas station is additionally provided, as shown in figure 1, this gas station includes in embodiments of the invention：

For storing the fluid reservoir 10 of liquefied natural gas；

For to the liquid filler 20 treating aerating equipment filling liquefied natural gas；

And, for the liquefied natural gas in fluid reservoir 10 being delivered to the power set of described liquid filler 20；

Wherein, described power set adopt the power set provided in the embodiment of the present invention.

A kind of preferred embodiment of the LNG gas station that the present invention presented below provides.

Figure show the equipment flowsheet schematic diagram of the LNG gas station provided in the preferred embodiment of the present invention.

As shown in figure 1, in the present embodiment, LNG gas station includes：Fluid reservoir 10；Power set； Liquid filler 20, filling machine 30；Wherein, described power set include：Supercharging gasifier 310, intensification dress Put 320, low-pressure tank group 300, compressor 400, pressure pan group 500, the first suction flow container and the second suction Flow container etc., each of which suction flow container 100 is provided with inlet, leakage fluid dram, air inlet and air vent, First leakage fluid dram, the second leakage fluid dram, inlet and air vent are provided with described fluid reservoir 10, whole It is provided with BOG floss hole 700 on each connecting line of gas station；

Pass through the between the first leakage fluid dram on the inlet and described fluid reservoir 10 of each suction flow container 100 One control valve group 201 connects；Pass through second between the leakage fluid dram of each suction flow container 100 and charging machine to control Valve group 202 connects；Logical between the air inlet of each suction flow container 100 and the gas exhaust piping of pressure pan group 500 Cross the 3rd control valve group 203 to connect；The air vent of each suction flow container 100 and the air inlet of low-pressure tank group 300 Connected by the 4th control valve group 204 between pipeline；

Second leakage fluid dram of described fluid reservoir 10 and for and the fortune tank connected first positioned at gas transportation vehicle Pipeline section 401 can pass through pipeline, is sequentially connected described supercharging gasifier 310 and described heat riser 320 Afterwards, it is connected with the air inlet of described low-pressure tank group 300；

The BOG floss hole 700 of the air vent of described fluid reservoir 10 and whole gas station can be by pipe After road connects described heat riser 320, it is connected with the air inlet of described low-pressure tank group 300；

The gas outlet of described low-pressure tank group 300 is communicated to the air inlet of described compressor 400, described compressor 400 can adopt compound compressor, and the delivery outlet L of wherein said compressor is with described pressure pan group 500 even Connect, the delivery outlet H of compressor is connected with described CNG gas bomb group 301 and filling machine 30；

Pass through the first pipeline connection, in first pipe between described suction flow container 100 and described low-pressure tank group 300 It is provided with heat exchanger 600 between the gas exhaust piping of road and pressure pan group 500；

On the air inlet pipeline of low-pressure tank group 300, described heat riser 500 and described low-pressure tank group 300 Between be provided with pressure-regulating valve 900；On the air inlet pipeline of low-pressure tank group 300, described pressure pan group 500 It is additionally provided with pressure-regulating valve 900 and described suction flow container 100 between；Air inlet pipe in low-pressure tank group 300 Check valve 800 is additionally provided with road；

It is also associated with the first pipeline section 401 and the second pipeline section 402 at the two ends of described supercharging gasifier 310, the One pipeline section 401 and the second pipeline section 402 are used for being attached with the fortune tank on gas transportation vehicle；

The inlet of described fluid reservoir 10 is also associated with one be used for connecting described fluid reservoir 10 and gas transportation vehicle On fortune tank water influent pipeline.

Obviously, gas station provided in an embodiment of the present invention is had corresponding to the power set being provided with the present invention All beneficial effects.

Additionally, in the gas station that the preferred embodiment of the present invention is provided, described gas station can also include one Control device, can be controlled to whole gas station by this control device.

Wherein, this control device can control described suction flow container 100 described the according to predetermined strategy Mutually switch between one state and described second state.And it is preferred that when be provided with power set to During few two suction flow containers 100, described control device can control at least one suction according to predetermined strategy When Drainage tank 100 is in described first state, at least another suction flow container 100 is controlled to be in described second State, so that at least two suction flow containers 100 can be continuously to liquid filler 20 feed flow.

It is preferred that described control device includes in gas station provided by the present invention：

Receiving unit, for obtaining the liquid level detector on described suction flow container 100, pressure detector and temperature The data that degree detector is gathered, and generate testing result；

First processing units, for receiving the testing result of described receiver module, and when described testing result is When described suction flow container 100 current level value is less than the first default level value, generate the first control signal；

First performance element, for when receiving the first control signal that described first processing units send, The air vent controlling described suction flow container 100 is communicated with described low pressure exhaust mechanism, described suction flow container 100 Leakage fluid dram and liquid filler 20 separated, the air inlet of described suction flow container 100 and described high pressure are supplied gas Mechanism separated, then control the inlet of described suction flow container 100 and the first discharge opeing of fluid reservoir 10 Mouth is connected, so that described suction flow container 100 is from fluid reservoir 10 imbibition；

Second processing unit, for receiving the testing result of described receiver module, and when described testing result is When described suction flow container 100 current pressure values reach the second predetermined pressure, generate the second control signal；

Second performance element, for when receiving the second control signal that described second processing unit sends, The inlet of described suction flow container 100 is controlled to disconnect with the first leakage fluid dram of fluid reservoir 10, described liquid sucking-discharging The air vent of tank 100 is separated with described low pressure exhaust mechanism, the leakage fluid dram of described suction flow container 100 with Communicate between liquid filler 20, the air inlet of described suction flow container 100 and described high pressure are supplied gas phase between mechanism Logical so that in described suction flow container 100 liquefied natural gas supercharging the discharge opeing of backward liquid filler 20.

Using such scheme, can by control device according to the current level value of each suction flow container 100 and Current pressure values, to control each suction flow container 100 and fluid reservoir 10, liquid filler 20, pressure pan group 500 And the working condition of each control valve group between low-pressure tank group 300, to control each suction flow container 100 First state and the second state switching, and according to predetermined strategy, two suction flow containers can be controlled 100 when being in first state, and another suction flow container 100 is in the second state.

It should be noted that it is preferred that according to the current level value of suction flow container 100 in such scheme, Suction flow container 100 is controlled to switch to first state, when current level value suction flow container 100 is detected is low When default level value, control suction flow container 100 start imbibition it should be appreciated that the present invention its It is also possible to control the switching of the first state of suction flow container 100, example according to other modes in his embodiment As：Described first processing units can also be according to the current pressure values of suction flow container 100, when described liquid sucking-discharging When tank 100 current pressure values reach the first predetermined pressure, control device controls suction flow container 100 to switch to the One state.

Similarly, it is preferred that according to the current pressure of suction flow container 100, to control in such scheme Suction flow container 100 switches to the second state, and when current pressure suction flow container 100 is detected, to reach second pre- If during pressure, suction flow container 100 is controlled to start discharge opeing it should be appreciated that other in the present invention are implemented It is also possible to control the switching of the second state of suction flow container 100 according to other modes, such as in example：Institute State second processing unit and can also be current level value according to suction flow container 100, when described suction flow container When 100 current level values are higher than the first default level value, control device controls suction flow container 100 to switch to the Two-state.

Also, it should be noted in gas station provided by the present invention, each connecting line can also be arranged Other control valve groups in addition to above-mentioned first, second, third and fourth control valve group and being used for detect each The pressure of connecting line, temperature isoparametric detection device, described control device can also be according to predetermined plan Slightly, to control the working condition of other control valve groups in gas station, this is no longer illustrated one by one.

The work process of the gas station below providing in the explanation preferred embodiment of the present invention.

One) unload process：

It is possible, firstly, to fluid reservoir 10 be communicated so that storing up with fortune tank by the water influent pipeline of fluid reservoir 10 Between flow container 10 and fortune tank, pressure reaches balance；

Then, by the connection between the water influent pipeline of cut-out fluid reservoir 10 between fluid reservoir 10 and fortune tank, And utilize described first pipeline section 401 and described second pipeline section 402 will be pressurized gasifier 310 and positioned at gas transportation vehicle On fortune tank connect, in fortune tank liquefied natural gas can through described supercharging gasifier 310 pressurization after, Return again to fortune tank, realize fortune tank is pressurizeed；

Finally, cut-out between gasifier 310 and fortune tank will be pressurized, by between fortune tank and fluid reservoir 10 Connect again, because fortune pressure inside the tank is more than pressure in fluid reservoir 10, utilize pressure reduction between the two, that is, The process of unloading can be completed.

Two) aerating control process：

According to predetermined strategy, the first suction flow container 100 is controlled to be in first state so as to air vent and institute State low pressure exhaust mechanism to communicate, leakage fluid dram is disconnected with liquid filler 20, air inlet and described high pressure are supplied gas mechanism Disconnect, and make the pressure less than fluid reservoir 10 for the pressure of the first suction flow container 100, then, by first The inlet of suction flow container is connected with the first leakage fluid dram of fluid reservoir 10, from fluid reservoir 10 imbibition；Meanwhile, The second suction flow container 100 is controlled to be in the second state so that the first discharge opeing of its inlet and fluid reservoir 10 Mouth communicates, and air vent is communicated with described low pressure exhaust mechanism, and leakage fluid dram is disconnected with liquid filler 20, air inlet Disconnect with described high pressure mechanism of supplying gas, and make the pressure of the pressure filling machine of the second suction flow container 100, and To liquid filler 20 discharge opeing；When the first suction flow container 100 completes imbibition, the second suction flow container 100 row of completing During liquid, then control the first suction flow container 100 to start discharge opeing, meanwhile, control the second suction liquid pipe to start imbibition, So repeatedly.

Wherein in aerating control process, according to practical situation, can control fluid reservoir 10 leakage fluid dram, One or more of fortune tank on the air vent of fluid reservoir 10, gas transportation vehicle and BOG floss hole 700 To connect with low-pressure tank group 300.

On the basis of above-mentioned LNG gas station, present invention also offers a kind of control method of gas station, This control method is proposed, described control method bag based on the LNG gas station providing in the embodiment of the present invention Include：Control the step to charging machine transportation of liquefied natural gas for the fluid reservoir 10, i.e. aerating rate-determining steps, tool Body includes：

Step S1：According to predetermined strategy, control the air vent of described suction flow container 100 and described low pressure Exhaust gear communicates, and the leakage fluid dram of described suction flow container 100 and liquid filler 20 disconnect, described suction flow container 100 air inlet and described high pressure mechanism of supplying gas disconnects, so that the pressure of described suction flow container 100 is less than storage Then the inlet of suction flow container 100 is connected by the pressure of flow container 10 with the first leakage fluid dram of fluid reservoir 10 Logical, and from fluid reservoir 10 imbibition；

Step S2：After completing step S1, according to predetermined strategy, control entering of suction flow container 100 Liquid mouth and the first leakage fluid dram disconnection, the air vent of described suction flow container 100 and the described low pressure of fluid reservoir 10 Exhaust gear disconnects, and the leakage fluid dram of described suction flow container 100 is communicated with liquid filler 20, described suction flow container 100 air inlet and described high pressure mechanism of supplying gas communicates so that the pressure of described suction flow container 100 be more than plus The pressure of note machine, and to liquid filler 20 discharge opeing, and after discharge opeing completes, it is back to step S1.

In control method provided by the present invention, when being provided with least two suctions in the power set of gas station During Drainage tank 100, when controlling wherein at least one suction flow container 100 execution step S1, control at least another One suction flow container 100 execution step S2.So, so that at least two suction flow containers 100 are continuous Ground is to charging machine feed flow.

In control method provided by the present invention, can be by the liquid level of each suction flow container 100, pressure Power and temperature etc. are detected, control first state and second shape of suction flow container 100 according to testing result The switching of state.Specifically, step S1 includes：

The liquid level detector on described suction flow container 100 on step S11, acquisition suction flow container 100, pressure The data that force detector and temperature detector are gathered；

Step S12, when described testing result be described suction flow container 100 current level value be less than first preset When level value and/or described suction flow container 100 current pressure values reach the first predetermined pressure, control described suction The inlet of Drainage tank 100 is communicated with the first leakage fluid dram of fluid reservoir 10, the row of described suction flow container 100 QI KOU is communicated with described low pressure exhaust mechanism, between the leakage fluid dram of described suction flow container 100 and liquid filler 20 Disconnect, the air inlet of described suction flow container 100 and described high pressure are supplied gas and disconnected between mechanism, so that described suction Drainage tank 100 is from fluid reservoir 10 imbibition.

Step S2 specifically includes：

The liquid level detector on described suction flow container 100 on step S21, acquisition suction flow container 100, pressure The data that force detector and temperature detector are gathered；

Step S22, when described testing result be described suction flow container 100 current level value be higher than second preset When level value and/or described suction flow container 100 current pressure values reach the second predetermined pressure, control described suction The inlet of Drainage tank 100 is disconnected with the first leakage fluid dram of fluid reservoir 10, the row of described suction flow container 100 QI KOU is disconnected with described low pressure exhaust mechanism, and the leakage fluid dram of described suction flow container 100 is communicated with liquid filler 20, The air inlet of described suction flow container 100 and described high pressure mechanism of supplying gas communicates, so that described suction flow container 100 Backward liquid filler 20 discharge opeing of interior liquefied natural gas supercharging.

Additionally, the structure based on the LNG gas station provided in the embodiment of the present invention, described method is also Including：Control the step to transportation of liquefied natural gas in fluid reservoir 10 for the fortune tank, i.e. step of unloading.

Step of unloading specifically includes：

Step S30, fortune tank is connected with fluid reservoir 10 so that pressure reaches in fortune tank and fluid reservoir 10 To balance；

Step S31, control the first pipeline section 401 and the second pipeline section 402 are communicated with fortune tank, by fortune tank After the intensified gasifier of liquefied natural gas 310 pressurization, return again to fortune tank；

Step S32, after completing step S31, by the first pipeline section 401 and the second pipeline section 402 and fortune Tank disconnects, and the second leakage fluid dram of described fluid reservoir 10 is connected with fortune tank, makes the liquefaction sky in fortune tank So gas is delivered in fluid reservoir 10.

The above is the preferred embodiment of the present invention it is noted that common skill for the art For art personnel, on the premise of without departing from principle of the present invention, some improvements and modifications can also be made, These improvements and modifications also should be regarded as protection scope of the present invention.

Claims (16)

1. a kind of power set, for being delivered to liquid filler by the liquefied natural gas in gas station fluid reservoir； It is characterized in that, described power set include：

Suction flow container, the tank body of described suction flow container is provided with air inlet, air vent, inlet and leakage fluid dram, The inlet of described suction flow container is connected with the first leakage fluid dram of fluid reservoir, the leakage fluid dram of described suction flow container with Liquid filler is connected；And,

Pneumatic adjusting mechanism, described Pneumatic adjusting mechanism includes high pressure and supplies gas mechanism and low pressure exhaust mechanism, institute State high pressure mechanism of supplying gas to be connected with the air inlet of described suction flow container, described low pressure exhaust mechanism and described suction The air vent of flow container is connected；

Wherein, described suction flow container has first state and second state of mutual switching,

In described first state, the inlet of described suction flow container is communicated with the first leakage fluid dram of fluid reservoir, institute The air vent stating suction flow container is communicated with described low pressure exhaust mechanism, the leakage fluid dram of described suction flow container and liquid feeding Machine disconnects, and the air inlet of described suction flow container and described high pressure mechanism of supplying gas disconnects, so that described suction flow container Pressure reaches the first predetermined pressure, and from fluid reservoir imbibition；

In described second state, the inlet of described suction flow container is disconnected with the first leakage fluid dram of fluid reservoir, institute State the air vent of suction flow container and the separated of described low pressure exhaust mechanism, the leakage fluid dram of described suction flow container with Communicate between liquid filler, the air inlet of described suction flow container is supplied gas with described high pressure and communicated between mechanism, so that The pressure of described suction flow container reaches the second predetermined pressure, and to liquid filler discharge opeing.

2. power set according to claim 1 it is characterised in that

Described suction flow container at least two, and when wherein at least one suction flow container is in described first state, At least another suction flow container is in described second state, so that at least two suction flow containers can be continuously To liquid filler feed flow.

3. power set according to claim 1 it is characterised in that

Described Pneumatic adjusting mechanism includes：

One low-pressure tank group, including at least one low-pressure tank, described low-pressure tank is provided with air inlet pipeline；

One compressor, described low-pressure tank is connected with the input port of described compressor；And,

One pressure pan group, including at least one pressure pan, described pressure pan is connected with the delivery outlet of described compressor Connect；

Wherein, described pressure pan group is provided with gas exhaust piping, described gas exhaust piping pass through pressure-regulating valve with The air inlet of described suction flow container is connected, and forms described high pressure and supply gas mechanism.

4. power set according to claim 3 it is characterised in that

The air inlet pipeline of described low-pressure tank group can be by pressure-regulating valve and booster gasification apparatus and liquid storage Second leakage fluid dram of tank, the flash steam of the fortune tank, the air vent of fluid reservoir and gas station being located on gas transportation vehicle One or more of floss hole connects.

5. power set according to claim 3 it is characterised in that

The air inlet pipeline of described low-pressure tank group and the gas exhaust piping of described pressure pan group are additionally provided with unidirectional Valve.

6. power set according to claim 3 it is characterised in that

The air inlet pipeline of described low-pressure tank group is connected with the air vent of described suction flow container, and forms described low pressure Exhaust gear.

7. power set according to claim 1 it is characterised in that

Described suction flow container is additionally provided with liquid level detector, pressure detector and temperature detector.

8. a kind of gas station, including：

For storing the fluid reservoir of liquefied natural gas；

For to the liquid filler treating aerating equipment filling liquefied natural gas；

And, for the liquefied natural gas in fluid reservoir is delivered to the power set of described liquid filler, it is special Levy and be, described power set are using the power set as described in any one of claim 1 to 7.

9. gas station according to claim 8 it is characterised in that

Described gas station also includes：

One control device, for according to predetermined strategy, controlling described suction flow container in described first state and Mutually switch between described second state.

10. gas station according to claim 9 it is characterised in that

Described control device can also control at least one suction flow container to be in described according to predetermined strategy During one state, at least another suction flow container is controlled to be in described second state, so that at least two suctions Flow container can be continuously to liquid filler feed flow.

11. gas stations according to claim 9 it is characterised in that

Described control device includes：

Receiving unit, for obtaining the liquid level detector on described suction flow container, pressure detector and temperature inspection Survey the data that device is gathered, and generate testing result；

First processing units, for receiving the testing result of described receiver module, and when described testing result is Described suction flow container current level value is less than the first default level value and/or described suction flow container current pressure values When reaching the first predetermined pressure, generate the first control signal；

First performance element, for when receiving the first control signal that described first processing units send, The inlet of described suction flow container is controlled to communicate with the first leakage fluid dram of fluid reservoir, the aerofluxuss of described suction flow container Mouth is communicated with described low pressure exhaust mechanism, and the leakage fluid dram of described suction flow container is separated with liquid filler, described The air inlet of suction flow container and described high pressure are supplied gas and are disconnected between mechanism, so that described suction flow container is from fluid reservoir Imbibition；

Second processing unit, for receiving the testing result of described receiver module, and when described testing result is Described suction flow container current level value is higher than the second default level value and/or described suction flow container current pressure values When reaching the second predetermined pressure, generate the second control signal；

Second performance element, for when receiving the second control signal that described second processing unit sends, The inlet of described suction flow container is controlled to disconnect with the first leakage fluid dram of fluid reservoir, the aerofluxuss of described suction flow container Mouth is separated with described low pressure exhaust mechanism, communicates between the leakage fluid dram of described suction flow container and liquid filler, The air inlet of described suction flow container is supplied gas with described high pressure and is communicated between mechanism, so that liquid in described suction flow container Change the backward liquid filler discharge opeing of natural gas boosting.

A kind of 12. control methods of gas station, described gas station is as any one of claim 8 to 11 institute The gas station stating is it is characterised in that methods described includes：Control fluid reservoir natural to charging machine transportation of liquefied The step of gas；Described control fluid reservoir specifically includes to the step of charging machine transportation of liquefied natural gas：

Step S1：According to predetermined strategy, control the inlet of suction flow container and the first discharge opeing of fluid reservoir Mouth communicates, and the air vent of described suction flow container is communicated with described low pressure exhaust mechanism, the row of described suction flow container Liquid mouth and liquid filler disconnect, and the air inlet of described suction flow container and described high pressure mechanism of supplying gas disconnects, so that institute The pressure stating suction flow container reaches the first predetermined pressure, and is less than the pressure of fluid reservoir, from fluid reservoir imbibition；

Step S2：After completing step S1, according to predetermined strategy, control the inlet of suction flow container Disconnect with the first leakage fluid dram of fluid reservoir, the air vent of described suction flow container is disconnected with described low pressure exhaust mechanism, The leakage fluid dram of described suction flow container is communicated with liquid filler, and the air inlet of described suction flow container and described high pressure are supplied gas Mechanism communicates, so that the pressure of described suction flow container reaches the second predetermined pressure, and reaches required for liquid filler Pressure, to liquid filler discharge opeing, and after discharge opeing completes, be back to step S1.

13. control methods according to claim 12 it is characterised in that

In the process, when described suction flow container at least two, control wherein at least one liquid sucking-discharging During tank execution step S1, control at least another suction flow container execution step S2, so that at least two suctions Drainage tank can be continuously to liquid filler feed flow.

14. control methods according to claim 13 it is characterised in that

In methods described, step S1 specifically includes：

Step S11, the liquid level detector obtaining on suction flow container, pressure detector and temperature detector are adopted The data of collection；

Step S12, when described testing result be that described suction flow container current level value is less than the first default liquid level When value and/or described suction flow container current pressure values reach the first predetermined pressure, control described suction flow container Inlet is communicated with the first leakage fluid dram of fluid reservoir, the air vent of described suction flow container and described low pressure exhaust machine Structure communicates, and the leakage fluid dram of described suction flow container is separated with liquid filler, the air inlet of described suction flow container with Described high pressure is supplied gas and is disconnected between mechanism, so that described suction flow container is from fluid reservoir imbibition.

15. control methods according to claim 13 it is characterised in that

In methods described, step S2 specifically includes：

Step S21, the liquid level detector obtaining on suction flow container, pressure detector and temperature detector are adopted The data of collection；

Step S22, when described testing result be described suction flow container current level value be higher than the second default liquid level When value and/or described suction flow container current pressure values reach the second predetermined pressure, control described suction flow container Inlet and the first leakage fluid dram disconnection, the air vent of described suction flow container and the described low pressure exhaust machine of fluid reservoir Structure disconnects, and the leakage fluid dram of described suction flow container communicated with liquid filler, the air inlet of described suction flow container with described High pressure mechanism of supplying gas communicates so that in described suction flow container liquefied natural gas supercharging backward liquid filler discharge opeing.

16. control methods according to claim 12 it is characterised in that

Described method also includes：Control the step to transportation of liquefied natural gas in fluid reservoir for the fortune tank；

Described control fortune tank specifically includes to the step of transportation of liquefied natural gas in fluid reservoir：

Step S31, control fortune tank are communicated with booster gasification apparatus, by liquefied natural gas in fortune tank through increasing After gasifying device of calming the anger pressurization, return again to fortune tank；

Step S32, after completing step S31, booster gasification apparatus and fortune tank is separated, will Second leakage fluid dram of described fluid reservoir is connected with fortune tank, makes the liquefied natural gas in fortune tank be delivered to liquid storage In tank.