CN215636527U - Single-column double-tube double-outlet LNG (liquefied natural gas) flowmeter gas filling system - Google Patents
Single-column double-tube double-outlet LNG (liquefied natural gas) flowmeter gas filling system Download PDFInfo
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- CN215636527U CN215636527U CN202121742635.0U CN202121742635U CN215636527U CN 215636527 U CN215636527 U CN 215636527U CN 202121742635 U CN202121742635 U CN 202121742635U CN 215636527 U CN215636527 U CN 215636527U
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Abstract
The utility model discloses a single-column double-tube double-outlet LNG (liquefied natural gas) flowmeter gas-filling system, wherein a first metering tube and a second metering tube which are arranged in parallel are arranged in a casing of a flowmeter, the flowmeter is connected with a liquid phase space of a storage tank through a liquid inlet of a liquid inlet pipeline, LNG is connected with the input end of the flowmeter through the liquid inlet and the liquid inlet pipeline, the output end of the flowmeter is respectively connected with a first liquid adding pipeline and a second liquid adding pipeline, the LNG flows out from the output end of the flowmeter after being metered by the first metering tube and the second metering tube respectively, and then liquid filling of a gas cylinder of an external vehicle is completed through the corresponding first liquid adding pipeline and the corresponding second liquid adding pipeline respectively. Through the mode, the single-column double-tube double-outlet LNG flowmeter gas filling system can achieve the purpose of simultaneously metering double metering channels in a single flowmeter shell, can be applied to an LNG double-gun gas filling machine, and completes simultaneous filling and metering settlement of two vehicles.
Description
Technical Field
The utility model relates to the technical field of LNG (liquefied natural gas) gas filling, in particular to a single-column double-tube double-outlet LNG flow meter gas filling system.
Background
To LNG gas station, if want to improve whole station's gassing efficiency through adopting the double-gun to add the mechanism of qi, adopt at a meter of two single measurement of mechanism of qi internally mounted that adds to realize at present more. The double-gun gas dispenser of this mode is bulky, and is with high costs, and because the components and parts that add the inside machine of qi are more, its cost of maintaining and changing is also higher.
At present, a single flow meter of a gas dispenser can only be connected with a gas filling gun to fill gas for vehicles, the gas filling efficiency of a gas filling station is improved, the gas dispenser with enough quantity is considered to be added at the beginning of design, and each gas dispenser with a single metering flow meter needs to be provided with an independent valve and an independent instrument operating system.
In order to facilitate the free entering and exiting of the vehicle in the gas station during gas filling, each gas filling machine must be kept a certain safe driving distance. Therefore, the gas filling machine with a single flow meter can increase the occupied area of the gas filling station, which causes waste of land resources.
In order to practice thrift the land and reduce equipment cost, adopt two single metering flowmeters of gas dispenser internally mounted to realize at present more, like this a gas dispenser just has two gas guns to add the gas for the vehicle, and the bigun of this mode adds the gas dispenser is bulky, and is with high costs, and because the components and parts such as the inside valve of gas dispenser, instruments are more, and partial valve and instrument can not share, and its cost of maintaining and changing is also higher.
SUMMERY OF THE UTILITY MODEL
The utility model mainly solves the technical problem of providing a single-column double-tube double-outlet LNG flowmeter gas filling system, wherein two flow tubes are arranged in one flowmeter shell and are provided with two metering channels, so that the aim of simultaneously metering the two metering channels in the single flowmeter shell can be fulfilled, the single-column double-tube double-outlet LNG flowmeter gas filling system can be applied to an LNG double-gun gas filling machine, and simultaneous filling and metering settlement of two vehicles can be completed.
In order to solve the technical problems, the utility model adopts a technical scheme that: the utility model provides a double-barrelled two export LNG flowmeter air entrainment systems of single-column, includes: a flow meter, a liquid inlet pipeline, a first liquid adding pipeline and a second liquid adding pipeline,
the flowmeter is connected with the liquid phase space of the storage tank through a liquid inlet of a liquid inlet pipeline, the LNG is connected with the input end of the flowmeter through the liquid inlet and the liquid inlet pipeline, the output end of the flowmeter is respectively connected with a first liquid adding pipeline and a second liquid adding pipeline,
the shell of the flow meter is internally provided with a first metering pipe and a second metering pipe which are arranged in parallel, LNG flows out from the output end of the flow meter after being metered by the first metering pipe and the second metering pipe respectively, and then gas cylinder liquid feeding to an external vehicle is completed through a corresponding first liquid feeding pipeline and a corresponding second liquid feeding pipeline respectively.
In a preferred embodiment of the utility model, the output end of the first liquid adding pipeline is provided with a first liquid adding port, the first liquid adding port is connected with a first liquid adding gun, the output end of the second liquid adding pipeline is provided with a second liquid adding port, the second liquid adding port is connected with a second liquid adding gun, and the first liquid adding gun and the second liquid adding gun are respectively connected with corresponding gas cylinders of external vehicles.
In a preferred embodiment of the utility model, a first liquid adding pneumatic valve and a first liquid adding filter are sequentially arranged on a first liquid adding pipeline between a first metering pipe and a first liquid adding port, and a first liquid adding one-way valve is arranged between the input end of the first liquid adding pneumatic valve and the output end of the first liquid adding filter in parallel;
a second liquid feeding pneumatic valve and a second liquid feeding filter are sequentially arranged on a second liquid outlet pipeline between the second metering pipe and the second liquid feeding port, and a second liquid feeding one-way valve is connected between the input end of the second liquid feeding pneumatic valve and the output end of the second liquid feeding filter in parallel.
In a preferred embodiment of the utility model, the LNG storage tank further comprises a return line and a return liquid port, wherein the return line is provided with a return liquid pneumatic valve and a return liquid one-way valve, and the LNG liquid in the shell of the flowmeter is connected with the liquid phase space of the storage tank through the return liquid pneumatic valve and the return liquid one-way valve.
In a preferred embodiment of the present invention, further comprising a first return air port, a first return air line, a second return air port and a second return air line,
the first gas return port is communicated with the liquid return port through a first gas return pipeline, a first breaking valve, a first gas return filter and a first gas return one-way valve are arranged on the first gas return pipeline, and after the first gas return port is connected with a corresponding gas cylinder, high-pressure gas sequentially passes through the first breaking valve, the first gas return filter and the first gas return one-way valve and then enters a gas phase space of the storage tank through the liquid return port;
the second gas return port is communicated with the liquid return port through a second gas return pipeline, a second breaking valve, a second gas return filter and a second gas return one-way valve are arranged on the second gas return pipeline, and after the second gas return port is connected with a corresponding gas cylinder, high-pressure gas sequentially passes through the second breaking valve, the second gas return filter and the second gas return one-way valve and then enters the gas phase space of the storage tank through the liquid return port.
In a preferred embodiment of the present invention, the liquid storage tank further comprises a gas return seat, an input end of the gas return seat is connected to the first filling port and the second filling port respectively, and an output end of the gas return seat enters the liquid phase space of the storage tank through the liquid return port after passing through the third gas return check valve and the liquid return check valve.
In a preferred embodiment of the utility model, the safety relief device further comprises a safety relief pipeline and a vent, the safety relief pipeline is directly connected with the gas phase space inside the shell of the flowmeter, a first stop valve and a safety valve are arranged on the safety relief pipeline, and a second stop valve is connected in parallel between the input end of the first stop valve and the output end of the safety valve.
In a preferred embodiment of the utility model, a differential pressure flow transmitter for measuring the differential pressure of the LNG flowing into the flowmeter is arranged on a shell of the flowmeter; the first metering pipe is provided with a first differential pressure transmitter for carrying out differential pressure measurement on the LNG flowing through the first metering pipe; the second metering pipe is provided with a second differential pressure transmitter for carrying out differential pressure measurement on the LNG flowing through the second metering pipe; the liquid inlet pipeline is also provided with a temperature transmitter for temperature compensation of the LNG; and a pressure transmitter is also connected on a pipeline between the output end of the flowmeter shell and the liquid return pneumatic valve.
In a preferred embodiment of the present invention, the system further comprises an integrating meter, and the differential pressure flow transmitter, the first differential pressure transmitter, the second differential pressure transmitter, the temperature transmitter and the pressure transmitter are electrically connected to the integrating meter.
The utility model has the beneficial effects that: according to the single-column double-tube double-outlet LNG flowmeter gas filling system, the two flow tubes are arranged in the flowmeter shell and are provided with the two metering channels, the purpose of simultaneously metering the two metering channels in the single flowmeter shell can be achieved, the single-column double-tube double-outlet LNG flowmeter gas filling system can be applied to an LNG double-gun gas filling machine, and simultaneous filling and metering settlement of two vehicles can be completed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural diagram of a single-column double-tube double-outlet LNG flow meter gas filling system of the utility model;
FIG. 2 is a schematic structural diagram of the gas filling principle of the single-column double-tube double-outlet LNG flow meter gas filling system;
the parts in the drawings are numbered as follows: 100. a flow meter, 110, a first metering pipe, 120, a second metering pipe, 130, a liquid inlet pipeline, 140, a liquid inlet,
210. a first liquid adding pipeline 211, a first liquid adding pneumatic valve 212, a first liquid adding filter 213, a first liquid adding one-way valve 214, a first liquid adding port,
220. a second liquid adding pipeline 221, a second liquid adding pneumatic valve 222, a second liquid adding filter 223, a second liquid adding one-way valve 224, a second liquid adding port,
230. a return pipeline 231, a liquid return pneumatic valve 232, a liquid return one-way valve 233 and a liquid return port,
240. a first gas return line 241, a first gas return port 242, a first shut-off valve 243, a first gas return filter 244, a first gas return check valve,
250. a second return air line 251, a second return air port 252, a second breaking valve 253, a second return air filter 254, a second return air check valve,
260. 261, a third air return one-way valve, 270, a safety relief pipeline, 271, a first stop valve, 272, a safety valve, 273, a second stop valve, 274 and a vent,
300. differential pressure flow transmitter, 400, first differential pressure transmitter, 500, second differential pressure transmitter, 600, temperature transmitter, 700, pressure transmitter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 2, an embodiment of the present invention includes:
a single-column double-tube double-outlet LNG flow meter gas filling system comprises: flowmeter 100, feed liquor pipeline 130, first liquid feeding pipeline 210 and second liquid feeding pipeline 220, flowmeter 100 passes through the liquid inlet 140 of feed liquor pipeline 130 and connects the liquid phase space of storage tank, and LNG passes through liquid inlet 140 and feed liquor pipeline 130 and connects flowmeter 100's input, and first liquid feeding pipeline 210 and second liquid feeding pipeline 220 are connected respectively to flowmeter 100's output:
the output end of the first liquid adding pipeline 210 is provided with a first liquid adding port 214, the first liquid adding port 214 is connected with a first liquid adding gun, the output end of the second liquid adding pipeline 220 is provided with a second liquid adding port 224, the second liquid adding port 224 is connected with a second liquid adding gun, and the first liquid adding gun and the second liquid adding gun are respectively connected with the corresponding gas cylinders of the external vehicles.
The first metering pipe 110 and the second metering pipe 120 which are arranged in parallel are arranged inside the shell of the flow meter 100, LNG flows out from the output end of the flow meter after being metered by the first metering pipe 110 and the second metering pipe 120 respectively, and liquid is added to the gas cylinder of an external vehicle through the corresponding first liquid adding pipeline 210 and the corresponding second liquid adding pipeline 220 respectively.
Further, the liquid inlet pipeline 130 is further provided with a temperature transmitter 600 for performing temperature compensation on the LNG, the output end of the flow meter 100 casing is further connected with a pressure transmitter 700, and the temperature transmitter 600 and the pressure transmitter 700 can monitor the temperature and pressure changes of the LNG liquid in the flow meter 100 casing in real time.
A differential pressure flow transmitter 300 for performing differential pressure measurement on the LNG flowing into the flowmeter is arranged on a casing of the flowmeter 100, and a density compensation differential pressure measurement device connected with the differential pressure flow transmitter 300 can obtain a density value of the LNG and complete density compensation on the LNG inside;
the first metering pipe 110 is provided with a first differential pressure transmitter 400 for measuring a differential pressure of LNG flowing through the first metering pipe 110, and the second metering pipe 120 is provided with a second differential pressure transmitter 500 for measuring a differential pressure of LNG flowing through the second metering pipe:
the first metering pipe 110 and the second metering pipe 120 both adopt venturi tubes, according to the bernoulli equation and the flow continuity equation, when the LNG medium flows through the first metering pipe 110 and the second metering pipe 120, a differential pressure is generated on two sides of the first metering pipe and the second metering pipe, a differential pressure value is measured by the first differential pressure transmitter 400 and the second differential pressure transmitter 500, and a gas-filled volume flow value is obtained from a relation between the differential pressure and the flow.
The differential pressure flow transmitter 300, the first differential pressure transmitter 400, the second differential pressure transmitter 500, the temperature transmitter 600 and the pressure transmitter 700 are all electrically connected with the integrating instrument. The totalizer preferably adopts a Flowcom model 3000 totalizer, and the signal access and the calculation process of all the transmitters are completed by an electric control element Flowcom model 3000 totalizer.
Specifically, a first liquid adding pneumatic valve 211 and a first liquid adding filter 212 are sequentially arranged on a first liquid adding pipeline 210 between a first metering pipe 110 and a first liquid adding port 214, and a first liquid adding one-way valve 213 is arranged between the input end of the first liquid adding pneumatic valve 211 and the output end of the first liquid adding filter 212 in parallel;
a second liquid feeding pneumatic valve 221 and a second liquid feeding filter 222 are sequentially arranged on the second liquid outlet pipeline 220 between the second metering pipe 120 and the second liquid feeding port 224, and a second liquid feeding check valve 223 is connected in parallel between the input end of the second liquid feeding pneumatic valve 221 and the output end of the second liquid feeding filter 222.
The utility model arranges two flow tubes in the shell of a flowmeter, which is provided with two metering channels, and can realize the purpose of simultaneously metering by two metering channels in the shell of a single flowmeter.
The LNG liquid storage tank further comprises a return pipeline 230 and a return liquid port 233, wherein a return liquid pneumatic valve 231 and a return liquid one-way valve 232 are arranged on the return pipeline 230, and the LNG liquid in the shell of the flow meter 100 is connected with the liquid phase space of the storage tank through the return liquid pneumatic valve 231 and the return liquid one-way valve 232.
Further comprising a first return air opening 241, a first return air line 240, a second return air opening 251 and a second return air line 250,
the first gas return port 241 is communicated with the liquid return port 233 through a first gas return line 240, the first gas return line 240 is provided with a first breaking valve 242, a first gas return filter 243 and a first gas return one-way valve 244, after the first gas return port 241 is connected with a corresponding gas cylinder, high-pressure gas passes through the first breaking valve 242, the first gas return filter 243 and the first gas return one-way valve 244 in sequence and then enters a gas phase space of the storage tank through the liquid return port 233;
the second gas return port 251 is communicated with the liquid return port 233 through a second gas return line 250, a second breaking valve 252, a second gas return filter 253 and a second gas return one-way valve 254 are arranged on the second gas return line 250, and after the second gas return port 251 is connected with a corresponding gas cylinder, high-pressure gas enters the gas phase space of the storage tank through the liquid return port 233 after sequentially passing through the second breaking valve 252, the second gas return filter 253 and the second gas return one-way valve 254.
The liquid filling device further comprises an air return seat 260, wherein the input end of the air return seat 260 is respectively connected with the first liquid adding port 214 and the second liquid adding port 224, and liquid adding debugging on the first metering pipe 110 and the second metering pipe 120 is respectively completed until the use requirements are met.
The output end of the air return seat 260 passes through the third air return check valve 261 and the liquid return check valve 232 and then enters the liquid phase space of the storage tank through the liquid return port 233.
The flowmeter further comprises a safety relief pipeline 270 and a vent 274, the safety relief pipeline 270 is directly connected with a gas phase space inside the shell of the flowmeter 100, a first stop valve 271 and a safety valve 272 are arranged on the safety relief pipeline 270, and a second stop valve 273 is connected in parallel between the input end of the first stop valve 271 and the output end of the safety valve 272.
Example two
A liquid adding method of a single-column double-tube double-outlet LNG flowmeter comprises a single-column double-tube double-outlet LNG flowmeter gas filling system in the first embodiment and comprises the following specific processes:
the air entraining process comprises the following steps:
the first port 214 is connected to the corresponding external vehicle gas cylinder through a first port gun, the second port 224 is connected to the corresponding external vehicle gas cylinder through a second port gun,
after the LNG in the storage tank enters the shell of the flowmeter 100 through the liquid inlet 140, the temperature transmitter 600 and the pressure transmitter 700 can monitor the temperature and pressure changes of the LNG liquid in the flowmeter shell 100 in real time, and the density value of the LNG is measured by a density compensation differential pressure measuring device connected with the differential pressure flow transmitter 300;
when the LNG medium flows through the first metering pipe 110 and the second metering pipe 120, the differential pressure values at two sides of the first metering pipe 110 and the second metering pipe 120 are respectively measured by the first differential pressure transmitter 400 and the second differential pressure transmitter 500, and the gas-filled volume flow values of the first metering pipe 110 and the second metering pipe 120 are respectively calculated according to the differential pressure and the flow relation;
when the first liquid adding port 214 is connected with a gas cylinder of a corresponding external vehicle for liquid adding, the first liquid adding pneumatic valve 211 is opened, the liquid returning pneumatic valve 231 is closed, the first liquid adding filter 212 filters out harmful substances such as impurities and particles in LNG liquid due to the fact that the gas cylinder has high requirement on the cleanliness of the LNG medium, the first liquid adding pneumatic valve 211 is automatically closed after gas adding is finished, and LNG liquid remained in the first liquid adding pneumatic valve 211 and the first liquid adding port hose returns to the shell of the flowmeter 100 through the first liquid adding one-way valve 213;
when the second filling opening 224 is connected with the gas cylinder filling of the corresponding external vehicle, the second filling pneumatic valve 332 is opened, the liquid return pneumatic valve 231 is closed, the gas cylinder has high requirement on the cleanliness of the LNG medium, the second filling filter 222 filters out impurities, particles and other harmful substances in the LNG liquid, the second filling pneumatic valve 221 is automatically closed after the filling is finished, and the LNG liquid remained in the second filling pneumatic valve 221 and the second filling opening hose returns to the shell of the flowmeter 100 through the second filling one-way valve 223.
Liquid returning process:
the process of returning the LNG liquid in the casing of the flowmeter 100 to the storage tank through the return line 230 is mainly to prevent the LNG liquid stored in the casing of the flowmeter 100 from increasing in temperature due to no liquid filling for a long time, which causes the change of the liquid density and the casing pressure to affect the metering accuracy and the use safety:
the first and second liquid adding pneumatic valves 211 and 221 are closed and the liquid return pneumatic valve 231 is opened, wherein the liquid return pneumatic valve 231 on the return line 230 is opened with both the first and second liquid adding pneumatic valves 211 and 221 closed,
the LNG liquid in the casing of the flowmeter 100 passes through the liquid return pneumatic valve 231 and the liquid return check valve 232 and then returns to the storage tank through the liquid return port 233, and all branch lines are provided with check valves, so that the liquid can only flow out through the liquid return port 233.
And (3) air return process:
LNG liquid uses up or places for a long time in the gas cylinder and can make the bottle internal pressure rise, and the dress of gas cylinder is realized through pressure differential, and high pressure is unfavorable for the dress of liquid, and the gas return process is mainly that the high-pressure LNG gas in the gas cylinder returns to the storage tank in through the gas return pipeline to a process that makes the gas cylinder internal pressure reduce:
when the first gas return port 241 is connected with the gas cylinder, high-pressure gas enters the storage tank through the liquid return port 233 after passing through the first breaking valve 242, the first gas return filter 243 and the first check valve 244;
after the second gas return port 251 is connected with the gas cylinder, high-pressure gas enters the storage tank through the liquid return port 233 after passing through the second breaking valve 252, the second gas return filter 253 and the second one-way valve 254;
after the input end of the gas return seat 260 is connected to the first filling port 214 and the second filling port 224, respectively, the LNG in the casing of the flowmeter 100 enters the liquid phase space of the storage tank through the liquid return port 233 after passing through the third gas return check valve 261 and the liquid return check valve 232, and the liquid feeding debugging of the first metering tube 110 and the second metering tube 120 is completed respectively until the use requirements are met. And (3) emptying:
since the flowmeter 100 housing is placed for a long time and can slowly exchange heat with the outside to form BOG gas, or some sudden external adverse factors can cause the pressure in the flowmeter housing to sharply rise and cause danger after the design strength of the equipment is exceeded,
the safety discharge valve is mainly arranged in the emptying process through a gas phase space, so that the pressure reaches the set process of self-discharge after the requirement, and the safety of personnel and equipment is effectively protected:
the vent 274 is directly connected with the gas phase space inside the casing of the flowmeter 100 through a safety relief pipeline 270, when the pressure inside the casing of the flowmeter 100 exceeds the design pressure, the safety valve 272 automatically opens and releases the pressure, and when the pressure inside the casing is less than the design pressure, the safety valve 272 automatically closes;
the first stop valve 271, which is always in the lead seal open state, functions to close the pipeline when the safety valve 272 is periodically checked; the second shut-off valve 273 is a manual drain valve provided to quickly discharge the pressure in the housing, and is normally required to be in a lead seal closed state.
The single-column double-pipe double-outlet LNG flow meter gas filling system has the beneficial effects that:
two flow tubes are arranged in one flowmeter shell and are provided with two metering channels, so that the aim of simultaneously metering two metering channels in a single flowmeter shell can be fulfilled, the flowmeter can be applied to an LNG double-gun gas filling machine, and simultaneous filling and metering settlement of two vehicles can be completed;
meanwhile, the volume and the weight of the double-gun gas dispenser are greatly reduced, and the initial investment cost and the later maintenance cost of the gas dispenser can be reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The utility model provides a double-barrelled two export LNG flowmeter air entrainment systems of single-column, its characterized in that includes: a flow meter, a liquid inlet pipeline, a first liquid adding pipeline and a second liquid adding pipeline,
the flowmeter is connected with the liquid phase space of the storage tank through a liquid inlet of a liquid inlet pipeline, the LNG is connected with the input end of the flowmeter through the liquid inlet and the liquid inlet pipeline, the output end of the flowmeter is respectively connected with a first liquid adding pipeline and a second liquid adding pipeline,
the shell of the flow meter is internally provided with a first metering pipe and a second metering pipe which are arranged in parallel, LNG flows out from the output end of the flow meter after being metered by the first metering pipe and the second metering pipe respectively, and then gas cylinder liquid feeding to an external vehicle is completed through a corresponding first liquid feeding pipeline and a corresponding second liquid feeding pipeline respectively.
2. The single-column double-tube double-outlet LNG flow meter gas filling system according to claim 1, wherein the output end of the first liquid filling pipeline is provided with a first liquid filling port, the first liquid filling port is connected with a first liquid filling gun, the output end of the second liquid filling pipeline is provided with a second liquid filling port, the second liquid filling port is connected with a second liquid filling gun, and the first liquid filling gun and the second liquid filling gun are respectively connected with gas cylinders of corresponding external vehicles.
3. The single-column double-tube double-outlet LNG flowmeter gas filling system according to claim 2, wherein a first liquid filling pneumatic valve and a first liquid filling filter are sequentially arranged on a first liquid filling pipeline between the first metering tube and the first liquid filling port, and a first liquid filling check valve is arranged between an input end of the first liquid filling pneumatic valve and an output end of the first liquid filling filter in parallel;
a second liquid feeding pneumatic valve and a second liquid feeding filter are sequentially arranged on a second liquid outlet pipeline between the second metering pipe and the second liquid feeding port, and a second liquid feeding one-way valve is connected between the input end of the second liquid feeding pneumatic valve and the output end of the second liquid feeding filter in parallel.
4. The single-column double-tube double-outlet LNG flow meter gas filling system according to claim 3, further comprising a return line and a liquid return port, wherein a liquid return pneumatic valve and a liquid return check valve are arranged on the return line, and LNG liquid in a shell of the flow meter is connected with a liquid phase space of the storage tank through the liquid return pneumatic valve and the liquid return check valve.
5. The single column, double tube, double outlet LNG flow meter gassing system of claim 4 further comprising a first return gas port, a first return gas line, a second return gas port, and a second return gas line,
the first gas return port is communicated with the liquid return port through a first gas return pipeline, a first breaking valve, a first gas return filter and a first gas return one-way valve are arranged on the first gas return pipeline, and after the first gas return port is connected with a corresponding gas cylinder, high-pressure gas sequentially passes through the first breaking valve, the first gas return filter and the first gas return one-way valve and then enters a gas phase space of the storage tank through the liquid return port;
the second gas return port is communicated with the liquid return port through a second gas return pipeline, a second breaking valve, a second gas return filter and a second gas return one-way valve are arranged on the second gas return pipeline, and after the second gas return port is connected with a corresponding gas cylinder, high-pressure gas sequentially passes through the second breaking valve, the second gas return filter and the second gas return one-way valve and then enters the gas phase space of the storage tank through the liquid return port.
6. The single-column double-tube double-outlet LNG flow meter gas filling system according to claim 5, further comprising a gas return seat, wherein an input end of the gas return seat is connected with the first liquid filling port and the second liquid filling port respectively, and an output end of the gas return seat enters the liquid phase space of the storage tank through the liquid return port after passing through a third gas return check valve and a liquid return check valve.
7. The single-column double-tube double-outlet LNG flowmeter gas filling system according to claim 5, further comprising a safety relief line and a vent, wherein the safety relief line is directly connected with a gas phase space inside a casing of the flowmeter, a first stop valve and a safety valve are arranged on the safety relief line, and a second stop valve is connected in parallel between an input end of the first stop valve and an output end of the safety valve.
8. The single-column double-tube double-outlet LNG flowmeter gas-filling system according to claim 7, wherein a differential pressure flow transmitter for measuring a differential pressure of LNG flowing into the flowmeter is provided on a casing of the flowmeter; the first metering pipe is provided with a first differential pressure transmitter for carrying out differential pressure measurement on the LNG flowing through the first metering pipe; the second metering pipe is provided with a second differential pressure transmitter for carrying out differential pressure measurement on the LNG flowing through the second metering pipe; the liquid inlet pipeline is also provided with a temperature transmitter for temperature compensation of the LNG; and a pressure transmitter is also connected on a pipeline between the output end of the flowmeter shell and the liquid return pneumatic valve.
9. The single-column double-tube double-outlet LNG flowmeter gas filling system according to claim 8, further comprising an integrator, wherein the differential pressure flow transmitter, the first differential pressure transmitter, the second differential pressure transmitter, the temperature transmitter and the pressure transmitter are electrically connected with the integrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121742635.0U CN215636527U (en) | 2021-07-29 | 2021-07-29 | Single-column double-tube double-outlet LNG (liquefied natural gas) flowmeter gas filling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121742635.0U CN215636527U (en) | 2021-07-29 | 2021-07-29 | Single-column double-tube double-outlet LNG (liquefied natural gas) flowmeter gas filling system |
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| Publication Number | Publication Date |
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| CN215636527U true CN215636527U (en) | 2022-01-25 |
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| CN202121742635.0U Active CN215636527U (en) | 2021-07-29 | 2021-07-29 | Single-column double-tube double-outlet LNG (liquefied natural gas) flowmeter gas filling system |
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2021
- 2021-07-29 CN CN202121742635.0U patent/CN215636527U/en active Active
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