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CN118482341B - LNG-CNG integrated gas recovery type supply method and system - Google Patents

LNG-CNG integrated gas recovery type supply method and system Download PDF

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Publication number
CN118482341B
CN118482341B CN202410939554.1A CN202410939554A CN118482341B CN 118482341 B CN118482341 B CN 118482341B CN 202410939554 A CN202410939554 A CN 202410939554A CN 118482341 B CN118482341 B CN 118482341B
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gas
gas recovery
pipeline
temperature
preset
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CN118482341A (en
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林永志
王冰
赵侃
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Hangzhou Yunqi Holding Co ltd
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Hangzhou Yunqi Holding Co ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q50/06—Energy or water supply
    • 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
    • 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
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • 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
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
    • G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
    • G06N20/00—Machine learning
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2250/032—Control means using computers
    • 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
    • F17C2250/034—Control means using wireless transmissions
    • 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
    • F17C2250/0443—Flow or movement of content
    • 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
    • F17C2250/0689—Methods for controlling or regulating
    • F17C2250/0694—Methods for controlling or regulating with calculations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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Abstract

The invention relates to the technical field of fuel gas recovery, and particularly discloses an LNG-CNG integrated fuel gas recovery type supply method and system. The invention firstly acquires a plurality of gas pressures, a plurality of gas flow rates and a plurality of gas temperatures of a meter in preset time, then acquires characteristic parameters of a gas recovery pipeline, can calculate a plurality of gas recovery flows according to the characteristic parameters, the plurality of gas pressures and the plurality of gas flow rates, then acquires temperature influence temperature difference coefficients in the preset time according to the plurality of gas temperatures, calculates a plurality of actual gas flows under the influence of the temperature influence temperature difference coefficients, inputs the plurality of actual gas flows and the preset gas flows into a comparison model for training, outputs a comparison value, judges whether the comparison value is equal to the preset comparison value, judges that the meter is in an abnormal working state if the comparison value is not equal to the preset comparison value, and sends a calibration command based on a gas recovery supply system, and resets and calibrates the meter according to the calibration command.

Description

LNG-CNG integrated gas recovery type supply method and system
Technical Field
The invention relates to the technical field of fuel gas recovery, in particular to an LNG-CNG integrated fuel gas recovery type supply method and system.
Background
LNG-CNG integrated refers to a system that combines two natural gas storage and transportation technologies, liquefied Natural Gas (LNG) and Compressed Natural Gas (CNG), such integrated systems generally comprising receiving, storing, gasifying, compressing, dispensing, and possibly re-liquefying, in order to fully utilize the advantages of LNG and CNG, respectively, and provide a flexible and efficient natural gas supply solution, for example, LNG may be a first choice for remote supply due to its high compressibility and ease of long-distance transportation; CNG is suitable for localization and fuel requirements of motor vehicles due to the high energy density and the characteristic of being convenient for use in cities;
When the existing LNG-CNG integrated fuel gas is converted into LNG-CNG, the recovery supply rate of the conversion reflects the loss during the conversion of LNG-CNG, the existing calculation loss is usually calculated by the actual capacity measured by a meter and the preset input capacity, the meter can generate errors in the long-term use process to further cause inaccurate loss calculation, and the existing meter calibration is usually calibrated in the preset working time for a fixed period, so that the metering accuracy cannot be maintained in the working process, and therefore, the LNG-CNG integrated fuel gas recovery supply method and system are needed to solve the problems.
Disclosure of Invention
The invention aims to provide an LNG-CNG integrated gas recovery type supply system so as to solve the technical problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
An LNG-CNG integrated gas recovery type supply method is applied to a gas recovery pipeline, wherein a meter is installed at a gas inlet of the gas recovery pipeline, and the method comprises the following steps:
Acquiring a plurality of air inlet parameters of a meter in preset time, wherein the air inlet parameters comprise gas pressure, gas flow rate and gas temperature;
Acquiring characteristic parameters of a gas recovery pipeline, and calculating a plurality of gas recovery flows according to the characteristic parameters, a plurality of gas pressures and a plurality of gas flow rates;
acquiring temperature influence temperature difference coefficients within preset time according to a plurality of gas temperatures, and calculating a plurality of actual gas flows according to a plurality of gas recovery flows and the temperature influence temperature difference coefficients;
inputting a plurality of actual gas flows and preset gas flows into a comparison model for training, and outputting a comparison value;
Judging whether the comparison value is equal to a preset comparison value or not;
if it is equal to the value, judging that the meter is in a normal working state;
If the gas recovery supply system is not equal to the meter, the meter is judged to be in an abnormal working state, and a calibration instruction is sent based on the gas recovery supply system, wherein the gas recovery supply system is a system for controlling the meter and the gas recovery pipeline, and the gas recovery supply system is connected with the meter and the gas recovery pipeline based on wireless communication and resets and calibrates the meter according to the calibration instruction.
Preferably, the step of acquiring a plurality of intake parameters of the meter in a preset time includes:
acquiring the pipeline outlet pressure when the gas recovery pipeline discharges the gas;
Acquiring the density and the preset flow rate of the fuel gas;
acquiring the length and the diameter of a fuel gas recovery pipeline, and acquiring the Darcy friction coefficient of the pipeline based on the Reynolds number;
And calculating a total pressure loss value according to the density of the fuel gas, the preset flow rate, the length and the diameter of the fuel gas recovery pipeline and the Darcy friction coefficient, wherein a calculation formula is as follows:
；
Wherein, The value of the total pressure loss is indicated,The coefficient of friction of darcy is indicated,Indicating the length of the gas recovery conduit,Indicating the diameter of the gas recovery conduit,Indicating the density of the gas fuel,Representing a preset flow rate of the fuel gas;
And calculating the gas pressure according to the pipeline outlet pressure and the total pressure loss value, wherein the calculation formula is as follows:
；
Wherein, The pressure of the fuel gas is indicated,The value of the total pressure loss is indicated,Representing the pipeline outlet pressure.
Preferably, the step of obtaining the characteristic parameters of the gas recovery pipeline and calculating a plurality of gas recovery flows according to the characteristic parameters, a plurality of gas pressures and a plurality of gas flow rates includes:
Acquiring the pipeline cross section and the pipeline material blocking medium coefficient according to the characteristic parameters of the fuel gas recovery pipeline;
Obtaining a plurality of pressure differences according to the plurality of gas pressures and the preset pipeline outlet pressure;
Acquiring average gas pressure according to a plurality of gas pressures;
Calculating a pressure influence index according to a plurality of pressure differences and the average pressure of the fuel gas, wherein the calculation formula is as follows:
；
Wherein, The index of the influence of pressure is indicated,Indicating the difference in pressure and the pressure of the fluid,Represents the average pressure of the gas, wherein i=1, 2, 3..n;
and sequentially calculating a plurality of gas recovery flows according to the plurality of gas flow rates, the pipeline sectional areas, the pipeline material blocking medium coefficients and the pressure influence indexes, wherein the calculation formula is as follows:
；
Wherein, Represents the gas recovery flow rates from the o-th to the k-th,Represents the cross-sectional area of the pipeline,Indicating the flow rate of the o-th gas,Representing the coefficient of the obstruction medium by the pipe material,And represents a pressure influence index, wherein o represents a sequence number, o=1, 2, 3.
Preferably, the step of obtaining the temperature influence temperature difference coefficient within a preset time according to a plurality of gas temperatures includes:
acquiring a starting time and an ending time according to preset time;
Calculating an average gas temperature according to the gas temperatures, the starting time and the ending time, wherein a calculation formula is as follows:
；
Wherein, The average gas temperature is indicated as the average gas temperature,The starting time is indicated as the time of day,The time of the end is indicated as such,The gas temperature is represented by n, the number of the gas temperatures is represented by n=1, 2, 3..n;
Calculating standard temperature difference values according to the gas temperatures and the average gas temperature, wherein a calculation formula is as follows:
；
Wherein, The standard temperature difference value is represented by the formula,The temperature of the first gas is indicated,The number of the gas temperature is represented, l represents the serial number of the gas temperature of the zone,Representing the average gas temperature;
calculating a temperature influence temperature difference coefficient according to the standard temperature difference value and the average gas temperature, wherein a calculation formula is as follows:
；
Wherein, Represents the temperature-affected temperature difference coefficient,The average gas temperature is indicated as the average gas temperature,The standard temperature difference is shown.
Preferably, the step of calculating a plurality of actual gas flows from a plurality of the gas recovery flows and temperature-affected temperature difference coefficients includes:
Calculating a plurality of actual gas flows according to a plurality of gas recovery flows and temperature influence temperature difference coefficients, wherein a calculation formula is as follows:
；
Wherein, Indicating the actual gas flow from the jth to the h,Represents the j-th gas recovery flow rate,The temperature influence coefficient is represented, j represents the serial number of the gas recovery flow, wherein j represents the serial number, j=1, 2, 3.
Preferably, the step of inputting a plurality of actual gas flows and preset gas flows into a comparison model for training and outputting a comparison value includes:
Inputting a plurality of actual gas flows and preset gas flows into a comparison model for training, and outputting comparison values, wherein the function formula of the comparison model is as follows:
；
Wherein, A comparison value is indicated and is used to indicate,Indicating the actual gas flow rate,The preset gas flow is indicated, and b indicates the number of actual gas flows, where b=1, 2, 3.
The application also provides an LNG-CNG integrated gas recovery type supply system, which comprises:
the first acquisition module is used for acquiring a plurality of air inlet parameters of the meter in preset time, wherein the air inlet parameters comprise gas pressure, gas flow rate and gas temperature;
the second acquisition module is used for acquiring the characteristic parameters of the gas recovery pipeline and calculating a plurality of gas recovery flows according to the characteristic parameters, a plurality of gas pressures and a plurality of gas flow rates;
the third acquisition module is used for acquiring temperature influence temperature difference coefficients in preset time according to the gas temperatures, and calculating a plurality of actual gas flows according to the gas recovery flows and the temperature influence temperature difference coefficients;
the first training module is used for inputting a plurality of actual gas flows and preset gas flows into the comparison model for training and outputting a comparison value;
the first judging module is used for judging whether the comparison value is equal to a preset comparison value or not;
if it is equal to the value, judging that the meter is in a normal working state;
If the gas recovery supply system is not equal to the meter, the meter is judged to be in an abnormal working state, and a calibration instruction is sent based on the gas recovery supply system, wherein the gas recovery supply system is a system for controlling the meter and the gas recovery pipeline, and the gas recovery supply system is connected with the meter and the gas recovery pipeline based on wireless communication and resets and calibrates the meter according to the calibration instruction.
Preferably, the first acquisition module includes:
a first acquisition unit for acquiring a pipeline outlet pressure when the gas recovery pipeline discharges the gas;
the second acquisition unit is used for acquiring the density and the preset flow rate of the fuel gas;
the third acquisition unit is used for acquiring the length and the diameter of the fuel gas recovery pipeline and acquiring the Darcy friction coefficient of the pipeline based on the Reynolds number;
The first calculation unit is used for calculating a total pressure loss value according to the density of the fuel gas, the preset flow rate, the length and the diameter of the fuel gas recovery pipeline and the Darcy friction coefficient, wherein the calculation formula is as follows:
；
Wherein, The value of the total pressure loss is indicated,The coefficient of friction of darcy is indicated,Indicating the length of the gas recovery conduit,Indicating the diameter of the gas recovery conduit,Indicating the density of the gas fuel,Representing a preset flow rate of the fuel gas;
And calculating the gas pressure according to the pipeline outlet pressure and the total pressure loss value, wherein the calculation formula is as follows:
；
Wherein, The pressure of the fuel gas is indicated,The value of the total pressure loss is indicated,Representing the pipeline outlet pressure.
The application also provides a computer device comprising a memory storing a computer program and a processor implementing the steps of the above method when executing the computer program.
The application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the above method.
The beneficial effects of the application are as follows: the application firstly acquires a plurality of air inlet parameters of a meter in preset time, wherein the air inlet parameters comprise gas pressure, gas flow rate and gas temperature, then acquires the characteristic parameters of a gas recovery pipeline, calculates a plurality of gas recovery flows according to the characteristic parameters, a plurality of gas pressures and a plurality of gas flow rates, then acquires temperature influence temperature difference coefficients in preset time according to the plurality of gas temperatures, calculates a plurality of actual gas flows under the influence of the temperature influence temperature difference coefficients, inputs the plurality of actual gas flows and the preset gas flows into a comparison model for training, outputs a comparison value, judges whether the comparison value is equal to the preset comparison value, judges that the meter is in a normal working state if the comparison value is equal to the preset comparison value, judges that the meter is in an abnormal working state if the comparison value is not equal to the preset comparison value, and sends a calibration command based on a gas recovery supply system, and resets and calibrates the meter according to the calibration command, so that the meter can be calibrated in time when the meter installed at an air inlet of the gas recovery pipeline generates errors, the meter can be kept accurate in real time, and the meter can be kept in real time, and the gas recovery pipeline can keep real-time and transport standard in real-time metering in the working process.
Drawings
FIG. 1 is a flow chart of a method according to an embodiment of the application.
Fig. 2 is a schematic diagram of a system structure according to an embodiment of the application.
Fig. 3 is a schematic diagram illustrating an internal structure of a computer device according to an embodiment of the application.
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 3, the present application provides an LNG-CNG integrated gas recovery type supply method applied to a gas recovery pipe, wherein a meter is installed at a gas inlet of the gas recovery pipe, including:
s1, acquiring a plurality of air inlet parameters of a meter in preset time, wherein the air inlet parameters comprise gas pressure, gas flow rate and gas temperature;
s2, acquiring characteristic parameters of a gas recovery pipeline, and calculating a plurality of gas recovery flows according to the characteristic parameters, a plurality of gas pressures and a plurality of gas flow rates;
S3, acquiring temperature influence temperature difference coefficients in preset time according to the gas temperatures, and calculating a plurality of actual gas flows according to the gas recovery flows and the temperature influence temperature difference coefficients;
S4, inputting a plurality of actual gas flows and preset gas flows into a comparison model for training, and outputting a comparison value;
S5, judging whether the comparison value is equal to a preset comparison value or not;
if it is equal to the value, judging that the meter is in a normal working state;
If the gas recovery supply system is not equal to the meter, the meter is judged to be in an abnormal working state, and a calibration instruction is sent based on the gas recovery supply system, wherein the gas recovery supply system is a system for controlling the meter and the gas recovery pipeline, and the gas recovery supply system is connected with the meter and the gas recovery pipeline based on wireless communication and resets and calibrates the meter according to the calibration instruction.
As described in the above steps S1-S5, when the LNG-CNG conversion is performed on the existing LNG-CNG integrated gas, the recovery supply rate of the conversion reflects the loss during the LNG-CNG conversion, the existing calculation loss is usually calculated by the actual capacity measured by the meter and the preset input capacity, the error occurs during the long-term use of the meter, and the loss calculation is inaccurate, the calibration of the existing meter is usually calibrated during the preset working time, so that the metering accuracy cannot be maintained during the working process, based on the calibration, a plurality of intake parameters of the meter during the preset working time are acquired, wherein the intake parameters include the gas pressure, the gas flow rate and the gas temperature, which can provide basis for acquiring the actual gas flow rate, then acquire the characteristic parameters of the gas recovery pipeline, then the recovery flow rate is calculated according to the characteristic parameters, the gas pressure and the gas flow rate, the recovery flow rate is the preset transmission flow rate of the gas recovery pipeline, then acquires the preset gas temperature according to the preset gas temperature, the preset temperature is accurately calibrated during the preset working time, the metering is not performed during the working process, based on the intake parameters include the gas pressure, the gas flow rate and the actual gas flow rate is not equal to the actual gas flow rate, and the actual gas flow rate is not equal to the actual gas flow rate is calculated, and the actual gas flow rate is not equal to the actual gas flow rate is compared to the actual flow rate when the actual flow rate is calculated and is not equal to the actual flow rate and is not equal to the actual flow rate, the gas recovery supply system is used for controlling the meter and the gas recovery pipeline, is connected with the meter and the gas recovery pipeline based on wireless communication and is used for resetting and calibrating the meter according to a calibration instruction, so that the meter can be calibrated timely when the meter installed at the gas inlet of the gas recovery pipeline is in error, the meter can be further kept accurate in real time, and the gas recovery pipeline can be further kept standard metering and conveyed in real time in the working process.
In one embodiment, the step S1 of acquiring a plurality of intake parameters of the meter in a preset time includes:
s101, acquiring pipeline outlet pressure when the gas recovery pipeline discharges gas;
s102, acquiring the density and the preset flow rate of the fuel gas;
s103, acquiring the length and the diameter of a gas recovery pipeline, and acquiring the Darcy friction coefficient of the pipeline based on the Reynolds number;
S104, calculating a total pressure loss value according to the density of the fuel gas, the preset flow rate, the length and the diameter of the fuel gas recovery pipeline and the Darcy friction coefficient, wherein a calculation formula is as follows:
；
Wherein, The value of the total pressure loss is indicated,The coefficient of friction of darcy is indicated,Indicating the length of the gas recovery conduit,Indicating the diameter of the gas recovery conduit,Indicating the density of the gas fuel,Representing a preset flow rate of the fuel gas;
s105, calculating the gas pressure according to the pipeline outlet pressure and the total pressure loss value, wherein a calculation formula is as follows:
；
Wherein, The pressure of the fuel gas is indicated,The value of the total pressure loss is indicated,Representing the pipeline outlet pressure.
As described in the above steps S101-S105, since the gas pressure at the gas inlet of the gas recovery pipe affects the flow transmission metering, it is necessary to obtain the gas pressure at the gas inlet of the gas recovery pipe to accurately calculate the actual capacity of the gas inlet of the gas recovery pipe, and then to compare the actual capacity with the preset flow, on this basis, the pipe outlet pressure when the gas is discharged from the gas recovery pipe is obtained first, wherein the pipe outlet pressure is separated from the pipe after the last complete output, then the density and the preset flow rate of the gas are obtained, then the length and the diameter of the gas recovery pipe are obtained, and the darcy friction coefficient of the pipe is obtained based on the reynolds number, wherein the darcy friction coefficient (Darcy friction factor) is an important concept in the fluid mechanics for describing the friction resistance encountered when the fluid flows in the pipe, and represents the energy loss caused by the roughness of the pipe wall and the viscosity of the fluid when the fluid flows in the pipe, and under the laminar flow condition, the darcy friction coefficient can be directly calculated by the reynolds number as follows: wherein Re represents the Reynolds number, then calculates the total pressure loss value according to the density of the fuel gas, the preset flow rate, the length, the diameter and the Darcy friction coefficient of the fuel gas recovery pipeline, and then calculates the fuel gas pressure according to the pipeline outlet pressure and the total pressure loss value, thus providing an important basis for accurately calculating the actual capacity of the current fuel gas recovery pipeline air inlet after calculating the fuel gas pressure.
In one embodiment, the step S2 of obtaining the characteristic parameters of the gas recovery pipeline and calculating a plurality of gas recovery flows according to the characteristic parameters, a plurality of gas pressures and a plurality of gas flow rates includes:
s201, acquiring a pipeline cross section area and a pipeline material blocking medium coefficient according to the characteristic parameters of the fuel gas recovery pipeline;
s202, acquiring a plurality of pressure differences according to a plurality of gas pressures and preset pipeline outlet pressures;
S203, acquiring gas average pressure according to a plurality of gas pressures;
S204, calculating a pressure influence index according to a plurality of pressure differences and average gas pressure, wherein a calculation formula is as follows:
；
Wherein, The index of the influence of pressure is indicated,Indicating the difference in pressure and the pressure of the fluid,Represents the average pressure of the gas, wherein i=1, 2, 3..n;
S205, sequentially calculating a plurality of gas recovery flows according to the plurality of gas flow rates, the pipeline sectional areas, the pipeline material blocking medium coefficients and the pressure influence indexes, wherein the calculation formula is as follows:
；
Wherein, Represents the gas recovery flow rates from the o-th to the k-th,Represents the cross-sectional area of the pipeline,Indicating the flow rate of the o-th gas,Representing the coefficient of the obstruction medium by the pipe material,And represents a pressure influence index, wherein o represents a sequence number, o=1, 2, 3.
According to the invention, as described in the steps S201-S205, the pipeline cross section and the pipeline material blocking medium coefficient are firstly obtained according to the characteristic parameters of the gas recovery pipeline, so that after the characteristic coefficients of the gas recovery pipeline, the basis for accurately calculating the actual gas flow basis can be obtained, then a plurality of pressure differences are obtained according to a plurality of gas pressures and preset pipeline outlet pressures, then the gas average pressure is obtained according to a plurality of gas pressures, so that the pressure influence index is calculated according to a plurality of pressure differences and the gas average pressure, further the gas recovery flow can be calculated more accurately through the pressure influence index, and then a plurality of gas recovery flows are calculated in sequence according to the gas flow rates, the pipeline cross section, the pipeline material blocking medium coefficient and the pressure influence index, and the calculated gas recovery flow can provide an important basis for calculating the actual capacity of the gas inlet of the current gas recovery pipeline.
In one embodiment, the step S3 of obtaining the temperature-affecting temperature difference coefficient within a preset time according to the plurality of gas temperatures includes:
S301, acquiring a starting moment and an ending moment according to preset time;
S302, calculating an average gas temperature according to a plurality of gas temperatures, a starting time and an ending time, wherein a calculation formula is as follows:
；
Wherein, The average gas temperature is indicated as the average gas temperature,The starting time is indicated as the time of day,The time of the end is indicated as such,The gas temperature is represented by n, the number of the gas temperatures is represented by n=1, 2, 3..n;
S303, calculating standard temperature difference values according to a plurality of gas temperatures and average gas temperatures, wherein a calculation formula is as follows:
；
Wherein, The standard temperature difference value is represented by the formula,The temperature of the first gas is indicated,The number of the gas temperature is represented, l represents the serial number of the gas temperature of the zone,Representing the average gas temperature;
s304, calculating a temperature influence temperature difference coefficient according to the standard temperature difference value and the average gas temperature, wherein a calculation formula is as follows:
；
Wherein, Represents the temperature-affected temperature difference coefficient,The average gas temperature is indicated as the average gas temperature,The standard temperature difference is shown.
As described in the above steps S301-S304, since the pipeline is affected by temperature during gas transmission, the start time and the end time are obtained according to the preset time, then the average gas temperature is calculated according to the gas temperatures, the start time and the end time, then the standard temperature difference is calculated according to the gas temperatures and the average gas temperature, and finally the temperature affecting temperature difference coefficient is calculated according to the standard temperature difference value and the average gas temperature, so that after the temperature affecting temperature difference coefficient is obtained, the current actual gas flow is calculated through the temperature affecting temperature difference coefficient and the gas recovery flow meter, so that the calculated actual gas flow is more accurate, the calculation error is reduced, and whether the flow meter has an error can be prepared to be judged.
In one embodiment, the step S3 of calculating a plurality of actual gas flows according to a plurality of the gas recovery flows and temperature influence temperature difference coefficients includes:
S305, calculating a plurality of actual gas flows according to a plurality of gas recovery flows and temperature influence temperature difference coefficients, wherein a calculation formula is as follows:
；
Wherein, Indicating the actual gas flow from the jth to the h,Represents the j-th gas recovery flow rate,The temperature influence coefficient is represented, j represents the serial number of the gas recovery flow, wherein j represents the serial number, j=1, 2, 3.
As described in step S305, the present invention calculates a plurality of actual gas flows according to a plurality of the gas recovery flows and temperature-affecting temperature difference coefficients, so that the calculated plurality of actual gas flows can provide accurate parameters for comparison with a preset gas flow, and further, errors in single taking can be reduced through the plurality of actual gas flows.
In one embodiment, the step S4 of inputting the actual gas flows and the preset gas flows into the comparison model for training and outputting the comparison value includes:
s401, inputting a plurality of actual gas flows and preset gas flows into a comparison model for training, and outputting a comparison value, wherein the function formula of the comparison model is as follows:
；
Wherein, A comparison value is indicated and is used to indicate,Indicating the actual gas flow rate,The preset gas flow is indicated, and b indicates the number of actual gas flows, where b=1, 2, 3.
As described in step S401, the present application inputs a plurality of actual gas flows and preset gas flows into the comparison model for training, and outputs a comparison value, so that the calculated output comparison value can provide an important basis for comparison with the preset comparison value, and judges whether the output comparison value is equal to 1, if equal to 1, the meter is judged to be in a normal working state, if not equal to 1, the meter is judged to be in an abnormal working state, and a calibration instruction is sent based on the gas recovery supply system, and the meter is reset and calibrated according to the calibration instruction, so that when an error occurs in the meter installed at the gas inlet of the gas recovery pipeline, the meter can be calibrated in time, and further the meter can be kept accurate in real time, so that the gas recovery pipeline can keep standard metering in real time for transportation in the working process.
The application also provides an LNG-CNG integrated gas recovery type supply system, which comprises:
A first acquisition module 1, configured to acquire a plurality of intake parameters of a meter within a preset time, where the intake parameters include a gas pressure, a gas flow rate, and a gas temperature;
The second acquisition module 2 is used for acquiring the characteristic parameters of the gas recovery pipeline and calculating a plurality of gas recovery flows according to the characteristic parameters, a plurality of gas pressures and a plurality of gas flow rates;
A third obtaining module 3, configured to obtain temperature-affecting temperature difference coefficients within a preset time according to a plurality of gas temperatures, and calculate a plurality of actual gas flows according to a plurality of gas recovery flows and the temperature-affecting temperature difference coefficients;
The first training module 4 is used for inputting a plurality of actual gas flows and preset gas flows into a comparison model for training and outputting a comparison value;
A first judging module 5, configured to judge whether the comparison value is equal to a preset comparison value;
if it is equal to the value, judging that the meter is in a normal working state;
If the gas recovery supply system is not equal to the meter, the meter is judged to be in an abnormal working state, and a calibration instruction is sent based on the gas recovery supply system, wherein the gas recovery supply system is a system for controlling the meter and the gas recovery pipeline, and the gas recovery supply system is connected with the meter and the gas recovery pipeline based on wireless communication and resets and calibrates the meter according to the calibration instruction.
In one embodiment, the first acquisition module includes:
a first acquisition unit for acquiring a pipeline outlet pressure when the gas recovery pipeline discharges the gas;
the second acquisition unit is used for acquiring the density and the preset flow rate of the fuel gas;
the third acquisition unit is used for acquiring the length and the diameter of the fuel gas recovery pipeline and acquiring the Darcy friction coefficient of the pipeline based on the Reynolds number;
The first calculation unit is used for calculating a total pressure loss value according to the density of the fuel gas, the preset flow rate, the length and the diameter of the fuel gas recovery pipeline and the Darcy friction coefficient, wherein the calculation formula is as follows:
；
Wherein, The value of the total pressure loss is indicated,The coefficient of friction of darcy is indicated,Indicating the length of the gas recovery conduit,Indicating the diameter of the gas recovery conduit,Indicating the density of the gas fuel,Representing a preset flow rate of the fuel gas;
And calculating the gas pressure according to the pipeline outlet pressure and the total pressure loss value, wherein the calculation formula is as follows:
；
Wherein, The pressure of the fuel gas is indicated,The value of the total pressure loss is indicated,Representing the pipeline outlet pressure.
As shown in fig. 3, the present invention further provides a computer device, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the above-mentioned integrated gas recovery type supply method for LNG-CNG when executing the computer program.
The present invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps for the LNG-CNG integrated gas recovery supply method described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by hardware associated with a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium provided by the present application and used in embodiments may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual speed data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (SYNCHLINK) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, apparatus, article, or method. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, apparatus, article, or method that comprises the element.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the invention.

Claims (9)

1. An LNG-CNG integrated gas recovery type supply method is applied to a gas recovery pipeline, wherein a meter is installed at a gas inlet of the gas recovery pipeline, and the LNG-CNG integrated gas recovery type supply method is characterized by comprising the following steps:
Acquiring a plurality of air inlet parameters of a meter in preset time, wherein the air inlet parameters comprise gas pressure, gas flow rate and gas temperature;
Acquiring characteristic parameters of a gas recovery pipeline, and calculating a plurality of gas recovery flows according to the characteristic parameters, a plurality of gas pressures and a plurality of gas flow rates;
acquiring a starting time and an ending time according to preset time;
Calculating an average gas temperature according to the gas temperatures, the starting time and the ending time, wherein a calculation formula is as follows:
；
Wherein, The average gas temperature is indicated as the average gas temperature,The starting time is indicated as the time of day,The time of the end is indicated as such,The gas temperature is represented by n, the number of the gas temperatures is represented by n=1, 2, 3..n;
Calculating standard temperature difference values according to the gas temperatures and the average gas temperature, wherein a calculation formula is as follows:
；
Wherein, The standard temperature difference value is represented by the formula,The temperature of the first gas is indicated,The number indicating the gas temperature, i the number indicating the gas temperature,Representing the average gas temperature;
calculating a temperature influence temperature difference coefficient according to the standard temperature difference value and the average gas temperature, wherein a calculation formula is as follows:
；
Wherein, Represents the temperature-affected temperature difference coefficient,The average gas temperature is indicated as the average gas temperature,Representing standard temperature difference values, and calculating a plurality of actual gas flows according to a plurality of gas recovery flows and temperature influence temperature difference coefficients;
inputting a plurality of actual gas flows and preset gas flows into a comparison model for training, and outputting a comparison value;
Judging whether the comparison value is equal to a preset comparison value or not;
if it is equal to the value, judging that the meter is in a normal working state;
If the gas recovery supply system is not equal to the meter, the meter is judged to be in an abnormal working state, and a calibration instruction is sent based on the gas recovery supply system, wherein the gas recovery supply system is a system for controlling the meter and the gas recovery pipeline, and the gas recovery supply system is connected with the meter and the gas recovery pipeline based on wireless communication and resets and calibrates the meter according to the calibration instruction.
2. The LNG-CNG integrated gas recovery type supply method according to claim 1, wherein the step of acquiring a plurality of intake parameters of the meter for a preset time further comprises:
acquiring the pipeline outlet pressure when the gas recovery pipeline discharges the gas;
Acquiring the density and the preset flow rate of the fuel gas;
acquiring the length and the diameter of a fuel gas recovery pipeline, and acquiring the Darcy friction coefficient of the pipeline based on the Reynolds number;
And calculating a total pressure loss value according to the density of the fuel gas, the preset flow rate, the length and the diameter of the fuel gas recovery pipeline and the Darcy friction coefficient, wherein a calculation formula is as follows:
；
Wherein, The value of the total pressure loss is indicated,The coefficient of friction of darcy is indicated,Indicating the length of the gas recovery conduit,Indicating the diameter of the gas recovery conduit,Representing the density of the fuel gas, V representing the preset flow rate of the fuel gas;
And calculating the gas pressure according to the pipeline outlet pressure and the total pressure loss value, wherein the calculation formula is as follows:
；
Wherein, The pressure of the fuel gas is indicated,The value of the total pressure loss is indicated,Representing the pipeline outlet pressure.
3. The LNG-CNG integrated gas recovery type supply method according to claim 1, wherein the step of acquiring the characteristic parameters of the gas recovery pipeline and calculating a plurality of gas recovery flows according to the characteristic parameters, a plurality of gas pressures and a plurality of gas flow rates comprises:
Acquiring the pipeline cross section and the pipeline material blocking medium coefficient according to the characteristic parameters of the fuel gas recovery pipeline;
Obtaining a plurality of pressure differences according to the plurality of gas pressures and the preset pipeline outlet pressure;
Acquiring average gas pressure according to a plurality of gas pressures;
Calculating a pressure influence index according to a plurality of pressure differences and the average pressure of the fuel gas, wherein the calculation formula is as follows:
；
Wherein, The index of the influence of pressure is indicated,Indicating the difference in pressure and the pressure of the fluid,Represents the average pressure of the gas, wherein i=1, 2, 3..n;
and sequentially calculating a plurality of gas recovery flows according to the plurality of gas flow rates, the pipeline sectional areas, the pipeline material blocking medium coefficients and the pressure influence indexes, wherein the calculation formula is as follows:
；
Wherein, Represents the gas recovery flow rates from the o-th to the k-th,Represents the cross-sectional area of the pipeline,Indicating the flow rate of the o-th gas,Representing the coefficient of the obstruction medium by the pipe material,And represents a pressure influence index, wherein o represents a sequence number, o=1, 2, 3.
4. The LNG-CNG integrated gas recovery type supply method according to claim 1, wherein the step of calculating a plurality of actual gas flows from a plurality of the gas recovery flows and temperature-affected temperature difference coefficients comprises:
Calculating a plurality of actual gas flows according to a plurality of gas recovery flows and temperature influence temperature difference coefficients, wherein a calculation formula is as follows:
；
Wherein, Indicating the actual gas flow from the jth to the h,Represents the j-th gas recovery flow rate,The temperature influence coefficient is represented, j represents the serial number of the gas recovery flow, wherein j represents the serial number, j=1, 2, 3.
5. The LNG-CNG integrated gas recovery type supply method according to claim 1, wherein the step of inputting a plurality of the actual gas flow rates and preset gas flow rates into a comparison model for training and outputting a comparison value comprises:
Inputting a plurality of actual gas flows and preset gas flows into a comparison model for training, and outputting comparison values, wherein the function formula of the comparison model is as follows:
；
Wherein, A comparison value is indicated and is used to indicate,Indicating the actual gas flow rate,The preset gas flow is indicated, and b indicates the number of actual gas flows, where b=1, 2, 3.
6. A system for the LNG-CNG integrated gas recovery supply process of claim 1, comprising:
the first acquisition module is used for acquiring a plurality of air inlet parameters of the meter in preset time, wherein the air inlet parameters comprise gas pressure, gas flow rate and gas temperature;
the second acquisition module is used for acquiring the characteristic parameters of the gas recovery pipeline and calculating a plurality of gas recovery flows according to the characteristic parameters, a plurality of gas pressures and a plurality of gas flow rates;
the third acquisition module is used for acquiring temperature influence temperature difference coefficients in preset time according to the gas temperatures, and calculating a plurality of actual gas flows according to the gas recovery flows and the temperature influence temperature difference coefficients;
the first training module is used for inputting a plurality of actual gas flows and preset gas flows into the comparison model for training and outputting a comparison value;
the first judging module is used for judging whether the comparison value is equal to a preset comparison value or not;
if it is equal to the value, judging that the meter is in a normal working state;
If the gas recovery supply system is not equal to the meter, the meter is judged to be in an abnormal working state, and a calibration instruction is sent based on the gas recovery supply system, wherein the gas recovery supply system is a system for controlling the meter and the gas recovery pipeline, and the gas recovery supply system is connected with the meter and the gas recovery pipeline based on wireless communication and resets and calibrates the meter according to the calibration instruction.
7. The system of claim 6, wherein the first acquisition module comprises:
a first acquisition unit for acquiring a pipeline outlet pressure when the gas recovery pipeline discharges the gas;
the second acquisition unit is used for acquiring the density and the preset flow rate of the fuel gas;
the third acquisition unit is used for acquiring the length and the diameter of the fuel gas recovery pipeline and acquiring the Darcy friction coefficient of the pipeline based on the Reynolds number;
The first calculation unit is used for calculating a total pressure loss value according to the density of the fuel gas, the preset flow rate, the length and the diameter of the fuel gas recovery pipeline and the Darcy friction coefficient, wherein the calculation formula is as follows:
；
Wherein, The value of the total pressure loss is indicated,The coefficient of friction of darcy is indicated,Indicating the length of the gas recovery conduit,Indicating the diameter of the gas recovery conduit,Representing the density of the fuel gas, V representing the preset flow rate of the fuel gas;
And calculating the gas pressure according to the pipeline outlet pressure and the total pressure loss value, wherein the calculation formula is as follows:
；
Wherein, The pressure of the fuel gas is indicated,The value of the total pressure loss is indicated,Representing the pipeline outlet pressure.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 5.
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