CN113446513A - LNG (liquefied Natural gas) dispenser adopting single return gas metering and method - Google Patents
LNG (liquefied Natural gas) dispenser adopting single return gas metering and method Download PDFInfo
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- CN113446513A CN113446513A CN202110734665.5A CN202110734665A CN113446513A CN 113446513 A CN113446513 A CN 113446513A CN 202110734665 A CN202110734665 A CN 202110734665A CN 113446513 A CN113446513 A CN 113446513A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/023—Special adaptations of indicating, measuring, or monitoring equipment having the mass as the parameter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/03—Control means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/04—Indicating or measuring of parameters as input values
- F17C2250/0404—Parameters indicated or measured
- F17C2250/0421—Mass or weight of the content of the vessel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/06—Controlling or regulating of parameters as output values
- F17C2250/0605—Parameters
- F17C2250/0615—Mass or weight of the content of the vessel
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses an LNG (liquefied natural gas) dispenser adopting single return gas metering and a method, wherein the LNG dispenser comprises a plurality of liquid phase mass flowmeters, and the plurality of liquid phase mass flowmeters are connected with gas filling guns; the system also comprises a plurality of control systems used for respectively controlling the plurality of liquid phase mass flowmeters, wherein the control systems and the liquid phase flowmeters are in one-to-one correspondence; the plurality of control systems can communicate with each other; the gas dispenser further comprises a unique gas phase mass flow meter, and the gas phase mass flow meter is connected with a gas return pipe and is respectively connected with the plurality of control systems. A plurality of air guns share one gas phase mass flowmeter for metering return air, so that the installation space of equipment is greatly reduced, the equipment repetition is reduced, the integral manufacturing cost is reduced, and the economic benefit is improved.
Description
Technical Field
The invention relates to an LNG dispenser adopting single return gas metering and a method for realizing double-gun sharing single return gas metering.
Background
The LNG filling machine is special metering equipment for filling LNG vehicles, LNG has the characteristics of low temperature (-162 ℃) and easiness in gasification, and when the LNG vehicles are filled, if the pressure of vehicle-mounted bottles is high, the vehicle-mounted bottles need to be returned, the pressure of the vehicle-mounted bottles is reduced, and then filling operation can be normally performed. During the air return operation, metering is needed, normal filling is started after air return is finished, and the air return amount subtracted from the total metering is equal to the actual filling amount.
The existing double-gun LNG dispenser needs to be provided with a gas phase mass flow meter and a pipeline for each gun, is high in cost and large in occupied space, and makes equipment difficult to miniaturize.
Disclosure of Invention
In view of the above, the present invention provides an LNG refueling gun and a refueling method using single gas return metering, so that the refueling guns in the same refueling machine share one gas phase mass flow meter.
In order to solve the technical problems, the technical scheme of the invention is as follows: an LNG filling method adopting single return gas metering comprises the following steps: acquiring a gas filling request; acquiring information whether air return is needed; if gas return is not needed, gas filling is carried out and liquid phase mass measurement is carried out simultaneously; the measured mass of the filling liquid phase is the actual filling amount; if air return is needed, judging whether the gas phase mass flow meter is occupied or not; if the gas phase mass flow meter is occupied, waiting or directly adding gas without returning gas; if the gas is not added back, the gas is added and the liquid phase mass measurement is carried out at the same time; the measured mass of the filling liquid phase is the actual filling amount; if the gas phase mass flowmeter is not occupied, returning gas and simultaneously carrying out gas phase mass metering; after gas return is finished, gas filling is carried out while liquid phase mass measurement is carried out; and subtracting the mass of the metered gas phase of the returned gas from the mass of the metered liquid phase of the filling to obtain the actual filling amount.
As an improvement, the control system I acquires a gas filling request from the client I and information whether gas is returned or not; if gas return is not needed, the control system I controls the gas filling gun I to fill gas, and meanwhile, the liquid phase mass flow meter I measures the filled liquid phase mass, and the measured value is the actual filling amount; if air return is needed, the control system I sends inquiry information to the control system II to judge whether the gas phase mass flow meter is occupied by the control system II; if the gas phase mass flow meter is occupied, the control system I waits for or controls the gas filling gun I to directly fill gas without returning gas; if the gas is directly added without returning gas, the liquid phase mass I is measured while the gas is added; the measured mass of the filling liquid phase is the actual filling amount; if the gas phase mass flowmeter is not occupied, the control system I controls the air return pipe to return air and controls the gas phase mass flowmeter to measure; after gas return is finished, the control system I controls the gas filling gun I to fill gas, and controls the liquid phase mass flow meter I to measure the quality of the filled liquid phase; and the controller I subtracts the metering number of the liquid phase mass flowmeter I from the metering number of the gas phase mass flowmeter to obtain the actual filling amount.
As an improvement, if the control system I selects to wait when the gas phase mass flow meter is occupied by the control system II, the control system II sends information to the control system I while releasing the gas phase mass flow meter, and the control system I occupies the gas phase mass flow meter after receiving the information.
As a preferred option, after sending the gas filling request, judging whether gas return is needed; if the pressure in the gas cylinder to be aerated is more than or equal to 1.2MPa, gas return is needed, and if the pressure in the gas cylinder to be aerated is less than 1.2MPa, gas return is not needed.
As an improvement, the pressure in the air cylinder which is returning air is measured when returning air, if the pressure in the air cylinder which is returning air is larger than or equal to 1.2MPa, the air returning is continued, and if the pressure in the air cylinder which is returning air is smaller than 1.2MPa, the air returning is stopped.
The invention also provides an LNG (liquefied natural gas) dispenser adopting single gas return metering, which comprises a plurality of liquid phase mass flowmeters, wherein the plurality of liquid phase mass flowmeters are connected with gas filling guns; the system also comprises a control system for respectively controlling the plurality of liquid phase mass flowmeters, wherein the control system and the liquid phase flowmeters are in one-to-one correspondence; the plurality of control systems can communicate with each other; the gas dispenser further comprises a unique gas phase mass flow meter, and the gas phase mass flow meter is connected with the plurality of control systems respectively.
As an improvement, the liquid phase mass flowmeter and the control system are two. The two liquid phase mass flowmeters are connected with the two air filling guns. Although the liquid phase mass flow meter and the air gun may be provided in plural in theory, it is sufficient to provide two due to site limitation in practical use.
As an improvement, the two control systems are connected by a CAN bus.
As an improvement, a temperature sensor, a density sensor and a gain sensor are integrated in the gas phase mass flowmeter.
As an improvement, the communication between the control system and the gas phase mass flowmeter and the communication between the control system and the liquid phase mass flowmeter are carried out through a modbus protocol.
The invention has the advantages that: the gas filling method with the steps and the gas filling machine with the structure enable the plurality of gas filling guns to share the gas phase mass flow meter for measuring the returned gas, the installation space of the equipment is greatly reduced, the equipment repetition is reduced, the integral manufacturing cost is reduced, and the economic benefit is improved.
Drawings
Fig. 1 is a schematic diagram of the present invention.
FIG. 2 is a flow chart of the steps of the present invention.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the following embodiments.
The invention provides an LNG (liquefied natural gas) filling method adopting single return gas metering, which comprises the following steps as shown in figure 1:
s1, acquiring a gas filling request;
s2, acquiring information whether air return is needed;
s31, if gas return is not needed, gas filling is carried out and liquid phase mass measurement is carried out at the same time; the measured mass of the filling liquid phase is the actual filling amount;
s32, if the gas needs to be returned, judging whether the gas phase mass flow meter is occupied;
s321, if the gas phase mass flow meter is occupied, directly filling gas with the gas or without returning the gas;
s3211, if gas is not returned, gas filling is carried out while liquid phase mass measurement is carried out; the measured mass of the filling liquid phase is the actual filling amount;
s322, if the gas phase mass flowmeter is not occupied, returning gas and simultaneously performing gas phase mass metering; after gas return is finished, gas filling is carried out while liquid phase mass measurement is carried out;
and S4, subtracting the mass of the back gas phase from the mass of the metered filling liquid phase to obtain the actual filling quantity.
As shown in fig. 2, the invention further provides an LNG dispenser adopting single return gas metering, which comprises a plurality of liquid phase mass flowmeters, wherein the plurality of liquid phase mass flowmeters are all connected with a gas filling gun; the system also comprises a plurality of control systems used for respectively controlling the plurality of liquid phase mass flowmeters, wherein the control systems and the liquid phase flowmeters are in one-to-one correspondence; the plurality of control systems can communicate with each other; the gas dispenser further comprises a unique gas phase mass flow meter, and the gas phase mass flow meter is connected with a gas return pipe and is respectively connected with the plurality of control systems.
In order to meet the actual site requirement, in this embodiment, a dual-liquid-phase mass flowmeter is adopted, that is, two liquid-phase mass flowmeters are respectively connected with two gas guns and share one gas-phase mass flowmeter. The liquid phase mass flowmeters are in one-to-one correspondence with the control system, so the liquid phase mass flowmeters I and the liquid phase mass flowmeters II are respectively controlled by the control system I and the control system II. And the gas phase mass flowmeter is respectively electrically connected with the control system I and the control system II. In this embodiment, the control system and the gas-phase mass flowmeter and the control system and the liquid-phase mass flowmeter are communicated by a modbus protocol. And the control system I and the control system II are connected by a CAN bus, thereby realizing communication.
It is foreseeable that, in order to realize human-computer interaction, this gas dispenser should still be provided with client I and client II who is connected with control system I and control system II respectively. The form of the client I and the client II is not limited, and the client I and the client II can be touch screens or buttons as long as human-computer interaction can be realized.
In order to collect information, a temperature sensor, a density sensor and a gain sensor are integrated in the gas phase mass flowmeter. During air return, the air return temperature, the density and the gain can be detected and fed back to the control system, so that whether the air filling condition is met or not is judged.
The method is described below by taking an example that two liquid phase mass flowmeters share one gas phase mass flowmeter, wherein the liquid phase mass flowmeter I, the liquid phase mass flowmeter II and the like are only used for distinguishing the two liquid phase mass flowmeters, and no sequential distinction is made.
And S1, the control system I acquires a gas filling request from the client I. Typically the operator sends a request to the control system for gas via a push button.
S2 controls system I to obtain information from client I whether to return air. And inquiring information whether air return is needed or not is displayed on the touch screen, and an operator selects whether air return is needed or not according to actual conditions. Specifically, if the pressure in the gas cylinder to be aerated is more than or equal to 1.2MPa, gas return is needed, and if the pressure in the gas cylinder to be aerated is less than 1.2MPa, gas return is not needed. Generally, a pressure gauge is arranged on each gas cylinder, and an operator can know whether gas refilling is needed or not by directly checking the pressure gauge.
And S31, if gas return is not needed, controlling the gas filling gun I to fill gas by the control system I, and simultaneously measuring the liquid phase mass of the filled gas by the liquid phase mass flowmeter I, wherein the measured value is the actual filling amount. And if the operator selects that air return is not needed on the touch screen, the control system I opens the valve after receiving the information and carries out air filling by using the air filling gun I. And meanwhile, the liquid phase mass flowmeter I is controlled to measure the mass of the liquid phase flowing through, and the measured mass of the liquid phase is the actual filling amount due to no return air.
And S32, if the air return is needed, the control system I sends inquiry information to the control system II to judge whether the gas phase mass flow meter is occupied by the control system II. And if the operator selects to return air on the touch screen, the control system I receives the information and sends inquiry information to the control system II through the CAN bus so as to judge whether the gas-phase mass flowmeter is occupied by the control system II.
S321, if the gas phase mass flowmeter is occupied, the control system I waits for or controls the gas filling gun I to directly fill gas without returning gas; and after receiving the inquiry information sent by the control system I, the control system II sends information for occupying the gas phase mass flow meter to the control system I, the information is also displayed on a touch screen of the client I, and an operator can select to wait or directly add gas without returning gas and feed back the selected information to the control system I.
S3211, if gas is added directly without returning, liquid phase mass I measurement is carried out while gas is added; the measured mass of the filling liquid phase is the actual filling amount; and the operator selects to directly add gas without returning gas, and the control system I controls the valve to be opened after receiving the feedback of the client I and utilizes the gas adding gun I to add gas. And meanwhile, the liquid phase mass flowmeter I is controlled to measure the mass of the liquid phase flowing through, and the measured mass of the liquid phase is the actual filling amount because of no return air.
S3212, if the control system I selects waiting when the gas phase mass flowmeter is occupied by the control system II, the control system II releases the gas phase mass flowmeter and sends information to the control system I, and the control system I occupies the gas phase mass flowmeter after receiving the information. And (4) the operator selects waiting, the control system I enters a waiting state after receiving the feedback of the client, and the control system II releases the gas-phase mass flowmeter after returning gas and simultaneously sends release information to the control system I. And after receiving the release information sent by the control system II, the control system I directly occupies the gas-phase mass flow meter and carries out gas return operation. And after the gas return is finished, the control system I controls the gas filling gun I to fill gas, and simultaneously controls the liquid phase mass flow meter I to measure the quality of the filled liquid phase.
S322, if the gas phase mass flowmeter is not occupied, the control system I controls the air return pipe to return air and controls the gas phase mass flowmeter to measure; after gas return is finished, the control system I controls the gas filling gun I to fill gas, and controls the liquid phase mass flow meter I to measure the quality of the filled liquid phase; and if the control system I receives the information that the control system II does not occupy the gas phase mass flow meter, the control system I immediately occupies the gas phase mass flow meter and controls the gas return pipe to return gas for gas return operation. When the pressure in the gas cylinder is reduced to below 1.2Mpa, stopping gas return, starting gas filling and metering.
And the S4 controller I subtracts the metering number of the liquid phase mass flow meter I from the metering number of the gas phase mass flow meter to obtain the actual filling quantity. Because the return air is to reduce the pressure in the gas cylinder in the gas holder that will be originally in the gas cylinder is carried to the gas filling station, consequently the return air can reduce the original gas storage volume in the gas cylinder. Therefore, in the final settlement, the final actual filling amount is obtained by subtracting the gas amount of the returned gas counted by the gas-phase mass flow meter from the gas amount of the filled gas counted by the liquid-phase mass flow meter I.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (10)
1. An LNG (liquefied natural gas) filling method adopting single return gas metering is characterized by comprising the following steps:
acquiring a gas filling request;
acquiring information whether air return is needed;
if gas return is not needed, gas filling is carried out and liquid phase mass measurement is carried out simultaneously; the measured mass of the filling liquid phase is the actual filling amount;
if air return is needed, judging whether the gas phase mass flow meter is occupied or not;
if the gas phase mass flow meter is occupied, waiting or directly adding gas without returning gas; if the gas is not added back, the gas is added and the liquid phase mass measurement is carried out at the same time; the measured mass of the filling liquid phase is the actual filling amount;
if the gas phase mass flowmeter is not occupied, returning gas and simultaneously carrying out gas phase mass metering; after gas return is finished, gas filling is carried out while liquid phase mass measurement is carried out;
and subtracting the mass of the metered gas phase of the returned gas from the mass of the metered liquid phase of the filling to obtain the actual filling amount.
2. An LNG filling method using single return gas metering according to claim 1, characterized in that:
the control system I acquires a gas filling request from a client I and information whether gas is returned or not;
if gas return is not needed, the control system I controls the gas filling gun I to fill gas, and meanwhile, the liquid phase mass flow meter I measures the filled liquid phase mass, and the measured value is the actual filling amount;
if air return is needed, the control system I sends inquiry information to the control system II to judge whether the gas phase mass flow meter is occupied by the control system II;
if the gas phase mass flow meter is occupied, the control system I waits for or controls the gas filling gun I to directly fill gas without returning gas; if the gas is directly added without returning gas, the liquid phase mass I is measured while the gas is added; the measured mass of the filling liquid phase is the actual filling amount;
if the gas phase mass flowmeter is not occupied, the control system I controls the air return pipe to return air and controls the gas phase mass flowmeter to measure; after gas return is finished, the control system I controls the gas filling gun I to fill gas, and controls the liquid phase mass flow meter I to measure the quality of the filled liquid phase;
and the controller I subtracts the metering number of the liquid phase mass flowmeter I from the metering number of the gas phase mass flowmeter to obtain the actual filling amount.
3. A method of refueling LNG with a single return gas dosage as claimed in claim 2, characterized by the steps of:
if the control system I selects to wait when the gas-phase mass flowmeter is occupied by the control system II, the control system II releases the gas-phase mass flowmeter and sends information to the control system I, and the control system I occupies the gas-phase mass flowmeter after receiving the information.
4. A method of refueling LNG with a single return gas dosage as claimed in claim 1, characterized by the steps of:
after the gas filling request is sent, judging whether gas return is needed or not; if the pressure in the gas cylinder to be aerated is more than or equal to 1.2MPa, gas return is needed, and if the pressure in the gas cylinder to be aerated is less than 1.2MPa, gas return is not needed.
5. A method of refueling LNG with a single return gas dosage as claimed in claim 1, characterized by the steps of:
and measuring the pressure in the gas cylinder which is being returned during gas return, continuing the gas return if the pressure in the gas cylinder which is being returned is more than or equal to 1.2MPa, and stopping the gas return if the pressure in the gas cylinder which is being returned is less than 1.2 MPa.
6. The utility model provides an adopt LNG of single return air measurement to add mechanism of qi which characterized in that: the system comprises a plurality of liquid phase mass flowmeters, wherein the plurality of liquid phase mass flowmeters are connected with air adding guns; the system also comprises a plurality of control systems used for respectively controlling the plurality of liquid phase mass flowmeters, wherein the control systems and the liquid phase flowmeters are in one-to-one correspondence; the plurality of control systems can communicate with each other; the gas dispenser further comprises a unique gas phase mass flow meter, and the gas phase mass flow meter is connected with a gas return pipe and is respectively connected with the plurality of control systems.
7. An LNG dispenser with single return gas metering as claimed in claim 6, wherein: the liquid phase mass flowmeter and the control system are both two.
8. An LNG dispenser with single return gas metering as claimed in claim 7, wherein: the two control systems are connected by a CAN bus.
9. An LNG dispenser with single return gas metering as claimed in claim 6, wherein: and a temperature sensor, a density sensor and a gain sensor are integrated in the gas phase mass flowmeter.
10. An LNG dispenser with single return gas metering as claimed in claim 6, wherein: the control system is communicated with the gas-phase mass flowmeter and the liquid-phase mass flowmeter through a modbus protocol.
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