CN109632029B - Method for selecting accurate measurement value of pipeline flow compensation pressure point - Google Patents

Method for selecting accurate measurement value of pipeline flow compensation pressure point Download PDF

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CN109632029B
CN109632029B CN201811595999.3A CN201811595999A CN109632029B CN 109632029 B CN109632029 B CN 109632029B CN 201811595999 A CN201811595999 A CN 201811595999A CN 109632029 B CN109632029 B CN 109632029B
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gas
value
pressure value
air pressure
gas meter
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CN109632029A (en
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陈丹
许俊城
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Guangzhou East Development Gas Co ltd
Guangzhou Development Group Inc
Guangzhou Gas Group Co Ltd
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Guangzhou East Development Gas Co ltd
Guangzhou Development Group Inc
Guangzhou Gas Group Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/02—Compensating or correcting for variations in pressure, density or temperature
    • 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

Abstract

The invention relates to a method for selecting an accurate measurement value of a pipeline flow compensation pressure point, which comprises the following steps: acquiring a gas pressure value P in a gas meter1And acquiring the air pressure value P in the gas transmission pipeline communicated with the gas meter2(ii) a Comparing the pressure value P1And the air pressure value P2The size of (d); when P is present1≠P2Then, the air pressure value P is selected1Is a pressure gauge value; when P is present1＝P2Then, the air pressure value P is selected1Or the air pressure value P2Is a pressure gauge value; according to the method for selecting the accurate measurement value of the pipeline flow compensation pressure point, in the gas charging measurement, the pressure measurement value and the gas flow of gas need to be detected, the gas volume under the gas charging measurement condition is calculated according to the pressure measurement value and the gas flow, and finally the trade charging calculation is carried out according to the gas volume; by comparing the pressure values P1And the air pressure value P2Can be avoided at P1≠P2At the pressure value P2The problem of inaccurate measurement caused by the pressure metering value is solved, and the metering accuracy of the gas pipeline is improved.

Description

Method for selecting accurate measurement value of pipeline flow compensation pressure point
Technical Field
The invention relates to the technical field of gas metering, in particular to a method for accurately measuring a value by selecting a pipeline flow compensation pressure point.
Background
In the process of designing a pipe network metering system, the influences of reducing of a pipeline, connection of a bent pipe and the like exist. In the aspect of gas flow metering compensation correction, the inaccuracy of pressure measurement and temperature measurement causes metering errors, and further the accuracy of pipeline gas metering is influenced.
Disclosure of Invention
Based on this, the invention provides a method for selecting an accurate measurement value of a pipeline flow compensation pressure point to improve the accuracy of pipeline gas measurement, so as to overcome the defects of the prior art.
A method for selecting an accurate measurement value of a pipeline flow compensation pressure point comprises the following steps: acquiring a gas pressure value P in a gas meter1And acquiring the air pressure value P in the gas transmission pipeline communicated with the gas meter2(ii) a Comparing the pressure value P1And the air pressure value P2The size of (d); when P is present1≠P2Then, the air pressure value P is selected1Is a pressure gauge value; when P is present1＝P2Then, the air pressure value P is selected1Or the air pressure value P2Is a pressure gauge value.
According to the technical requirements of the natural gas metering system of the national standard GB/T18603-2014 of the people's republic of China, the method for selecting the accurate measurement value of the pipeline flow compensation pressure point adopts the standard reference condition of the natural gas flow metering at 20 ℃ and the pressure at 101.325 kPa. In the gas charging measurement, a pressure measurement value and a gas flow of gas need to be detected, the gas volume under the gas charging measurement condition is obtained according to the pressure measurement value and the gas flow, and finally trade charging settlement is carried out according to the gas volume. The general gas flow is obtained in a meter of a gas meter, and when the gas pressure value is obtained, the gas pressure value P in the gas meter is obtained1And the air pressure value P in the gas transmission pipeline2By comparing the air pressure value P1And the air pressure value P2Can be avoided at P1≠P2At the pressure value P2For the problem of inaccurate measurement caused by a pressure metering value, the accuracy of gas pipeline metering can be improved through comparison.
In one embodiment, the air pressure value P in the gas meter is obtained1And acquiring the air pressure value P in the gas transmission pipeline communicated with the gas meter2The steps are as follows: establishing a barometric pressure value P1And the air pressure value P2The relation of (1):
Figure BDA0001920142180000021
said comparison air pressure value P1And air pressureValue P2The specific steps of the size are as follows: comparison
Figure BDA0001920142180000022
And
Figure BDA0001920142180000023
to determine the air pressure value P1And the air pressure value P2The magnitude relationship of (1); wherein: p represents the gas flow density; the V is1Representing the gas flow rate in the gas meter; the V is2Representing the gas flow rate in the gas transmission line in communication with the gas meter. By passing
Figure BDA0001920142180000024
Can be determined by determining the gas flow rate V1And gas flow velocity V2To determine the air pressure value P1And the air pressure value P2The air pressure value P can be obtained directly in this way1And the air pressure value P2Determining the air pressure value P1And the air pressure value P2The magnitude relationship of (1).
In one embodiment, the comparison is performed
Figure BDA0001920142180000025
And
Figure BDA0001920142180000026
the size of (A) comprises the following steps: obtaining flow path D in gas meter1And obtaining the flow through D in the gas pipeline2(ii) a Establishing a gas flow velocity V1And gas flow velocity V2The relation of (1):
Figure BDA0001920142180000027
said determined air pressure value P1And the air pressure value P2The step of (3) is as follows: when D is present1＝D2When is, P1＝P2(ii) a When D is present1≠D2When is, P1≠P2. In comparison with
Figure BDA0001920142180000028
And
Figure BDA0001920142180000029
by establishing
Figure BDA00019201421800000210
Can be measured by measuring the flow path D1And a flow path D2To determine the gas flow velocity V1And gas flow velocity V2Is further conveniently determined
Figure BDA00019201421800000211
And
Figure BDA00019201421800000212
the magnitude relationship of (1).
In one embodiment, the comparison is performed
Figure BDA00019201421800000213
And
Figure BDA00019201421800000214
the size of (A) comprises the following steps: a first flow rate sensor is arranged in the gas meter, and a second flow rate sensor is arranged in a gas transmission pipeline communicated with the gas meter; under the condition of gas introduction, the detection value of the first flow velocity sensor is acquired as a gas flow velocity V1Acquiring the detection value of the second flow rate sensor as the gas flow rate V2. Acquiring gas flow velocity V through first flow velocity sensor and second flow velocity sensor1And gas flow velocity V2The method is simple and easy to operate.
In one embodiment, the air pressure value P in the gas meter is obtained1And acquiring the air pressure value P in the gas transmission pipeline connected with the gas meter2The method specifically comprises the following steps: a first pressure sensor is arranged in the gas meter, and a second pressure sensor is arranged in a gas transmission pipeline connected with the gas meter; under the condition of gas introduction, the detection value of the first pressure sensor is acquired as an air pressure value P1Obtaining the detection of the second pressure sensorThe value is the air pressure value P2. Acquiring a gas flow rate P by a first pressure sensor and a second pressure sensor1And gas flow rate P2The method is simple and easy to operate.
Drawings
FIG. 1 is a flowchart illustrating a method for selecting a precision measurement value of a pipe flow compensated pressure point according to an embodiment;
FIG. 2 is a diagram illustrating an exemplary embodiment of establishing a pressure value P1And the air pressure value P2Model diagram of the relational expression of (1).
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
One embodiment provides a selection as shown in conjunction with FIG. 1The method for accurately measuring the pressure point of the pipeline flow compensation comprises the following steps: acquiring a gas pressure value P in a gas meter1And acquiring the air pressure value P in the gas transmission pipeline communicated with the gas meter2(ii) a Comparing the pressure value P1And the air pressure value P2The size of (d); when P is present1≠P2Then, the air pressure value P is selected1Is a pressure gauge value; when P is present1＝P2Then, the air pressure value P is selected1Or the air pressure value P2Is a pressure gauge value.
According to the technical requirements of a natural gas metering system of the national standard GB/T18603-2014 of the people's republic of China, the adopted standard reference condition for metering the natural gas flow is 20 ℃ and the pressure is 101.325 kPa. According to the method for selecting the accurate measurement value of the pipeline flow compensation pressure point, in the gas charging measurement, the pressure measurement value and the gas flow of gas need to be detected, the gas volume under the gas charging measurement condition is obtained according to the pressure measurement value and the gas flow, and finally trade charging settlement is carried out according to the gas volume. The general gas flow is obtained in a meter of a gas meter, and when the gas pressure value is obtained, the gas pressure value P in the gas meter is obtained1And the air pressure value P in the gas transmission pipeline2By comparing the air pressure value P1And the air pressure value P2Can be avoided at P1≠P2At the pressure value P2For the problem of inaccurate measurement caused by a pressure metering value, the accuracy of gas pipeline metering can be improved through comparison.
Specifically, in the present embodiment, the pressure value P in the gas meter is obtained1And acquiring the air pressure value P in the gas transmission pipeline communicated with the gas meter2The steps are as follows: establishing a barometric pressure value P1And the air pressure value P2The relation of (1):
Figure BDA0001920142180000041
said comparison air pressure value P1And the air pressure value P2The specific steps of the size are as follows: comparison
Figure BDA0001920142180000042
And
Figure BDA0001920142180000043
to determine the air pressure value P1And the air pressure value P2The magnitude relationship of (1); wherein: p represents the gas flow density; the V is1Representing the gas flow rate in the gas meter; the V is2Representing the gas flow rate in the gas transmission line in communication with the gas meter. By passing
Figure BDA0001920142180000051
Can be determined by determining the gas flow rate V1And gas flow velocity V2To determine the air pressure value P1And the air pressure value P2The air pressure value P can be obtained directly in this way1And the air pressure value P2Determining the air pressure value P1And the air pressure value P2The magnitude relationship of (1).
It is to be noted that
Figure BDA0001920142180000052
The establishment procedure is as follows:
shown in FIG. 1, A1And A2Respectively corresponding to regions with different pipe diameters, assume A1Is the meter cavity area in the gas meter, the height H from the area to the ground1Diameter D of the cavity in this region1The gas flow velocity V in this region1(ii) a Suppose A2Is the area of the lumen in the gas transmission pipeline, the height H of the area to the ground2Diameter D of the cavity in this region2The gas flow velocity V in this region2。
According to the law of conservation of mechanical energy of a fluid: kinetic energy + gravity energy + pressure potential energy being constant
Figure BDA0001920142180000053
Wherein: p represents the pressure of the fluid; v represents the flow rate of the fluid; ρ represents the density of the fluid; g represents the gravitational acceleration of the fluid; h represents the height of the position of the fluid; c represents a constant), establishing a gas energy conservation equation in the gas meter and in the gas transmission pipeline such asThe following:
Figure BDA0001920142180000054
compared with the height H1And height H2Is small, so that ρ gH1≈ρgH2And obtaining a simplified formula:
Figure BDA0001920142180000055
specifically, in the present embodiment, the comparison is performed
Figure BDA0001920142180000056
And
Figure BDA0001920142180000057
the size of (A) comprises the following steps: obtaining flow path D in gas meter1And obtaining the flow through D in the gas pipeline2(ii) a Establishing a gas flow velocity V1And gas flow velocity V2The relation of (1):
Figure BDA0001920142180000058
said determined air pressure value P1And the air pressure value P2The step of (3) is as follows: when D is present1＝D2When is, P1＝P2(ii) a When D is present1≠D2When is, P1≠P2. In comparison with
Figure BDA0001920142180000059
And
Figure BDA00019201421800000510
by establishing
Figure BDA00019201421800000511
Can be measured by measuring the flow path D1And a flow path D2To determine the gas flow velocity V1And gas flow velocity V2Is further conveniently determined
Figure BDA00019201421800000512
And
Figure BDA00019201421800000513
the magnitude relationship of (1).
It is to be noted that
Figure BDA00019201421800000514
The establishment procedure is as follows:
according to unit time A1And A2The equal volume of gas flowing through the region establishes the following equation:
Figure BDA0001920142180000061
further obtain
Figure BDA0001920142180000062
Following pair D1And D2Estimating the pressure value P by taking different values respectively1And the air pressure value P2The size of (d);
will be provided with
Figure BDA0001920142180000063
Bringing in
Figure BDA0001920142180000064
The following can be obtained:
Figure BDA0001920142180000065
when D is present1＝D2When is, P1＝P2；
When D is present1＜D2When is, P1＜P2For example: d1＝100mm、D2When 200mm, P1＝P2+0.469ρV1 2；
When D is present1＞D2When is, P1＜P2For example: d1＝200mm、D2When the thickness is 100mm, P1＝P2-7.5ρV1 2。
In other embodiments, the comparison is
Figure BDA0001920142180000066
And
Figure BDA0001920142180000067
the size of (A) comprises the following steps: a first flow rate sensor is arranged in the gas meter, and a second flow rate sensor is arranged in a gas transmission pipeline communicated with the gas meter; under the condition of gas introduction, the detection value of the first flow velocity sensor is acquired as a gas flow velocity V1Acquiring the detection value of the second flow rate sensor as the gas flow rate V2. Acquiring gas flow velocity V through first flow velocity sensor and second flow velocity sensor1And gas flow velocity V2The method is simple and easy to operate.
In other embodiments, the obtaining of the pressure value P in the gas meter1And acquiring the air pressure value P in the gas transmission pipeline connected with the gas meter2The method specifically comprises the following steps: a first pressure sensor is arranged in the gas meter, and a second pressure sensor is arranged in a gas transmission pipeline connected with the gas meter; under the condition of gas introduction, the detection value of the first pressure sensor is acquired as an air pressure value P1Acquiring the detection value of the second pressure sensor as an air pressure value P2. Acquiring an air pressure value P through a first pressure sensor and a second pressure sensor1And the air pressure value P2The method is simple and easy to operate.
Due to the air pressure value P1≠P2To realize accurate measurement of pressure, the pressure value P in the gas meter is selected1Is a pressure measurement value.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (5)

1. A method for selecting an accurate measurement value of a pipeline flow compensation pressure point is characterized by comprising the following steps:
acquiring a gas pressure value P in a gas meter1And acquiring the air pressure value P in the gas transmission pipeline communicated with the gas meter2；
Comparing the pressure value P1And the air pressure value P2By obtaining the pressure value P in the gas meter1And the air pressure value P in the gas transmission pipeline2Comparing the air pressure value P1And the air pressure value P2Can be avoided at P1≠P2At the pressure value P2For measurement inaccuracies caused by pressure measurement, when P1≠P2Then, the air pressure value P is selected1Is a pressure gauge value; when P is present1＝P2Then, the air pressure value P is selected1Or the air pressure value P2Is a pressure gauge value.
2. The method of claim 1, wherein the method comprises obtaining a pressure value P of a gas meter1And acquiring the air pressure value P in the gas transmission pipeline communicated with the gas meter2The steps are as follows:
establishing a barometric pressure value P1And the air pressure value P2The relation of (1):
Figure FDA0002487637210000011
said comparison air pressure value P1And the air pressure value P2The specific steps of the size are as follows:
comparison
Figure FDA0002487637210000012
And
Figure FDA0002487637210000013
to determine the air pressure value P1And the air pressure value P2The magnitude relationship of (1);
wherein: p represents the gas flow density; the V is1Representing the gas flow rate in the gas meter; the V is2Representing the gas flow rate in the gas transmission line in communication with the gas meter.
3. The method of selecting a precision measurement value for a pipe flow compensated pressure point of claim 2, wherein the comparing comprises comparing the values of the two pressure measurements
Figure FDA0002487637210000014
And
Figure FDA0002487637210000015
the size of (A) comprises the following steps:
obtaining flow path D in gas meter1And obtaining the flow through D in the gas pipeline2；
Establishing a gas flow velocity V1And gas flow velocity V2The relation of (1):
Figure FDA0002487637210000016
said determined air pressure value P1And the air pressure value P2The step of (3) is as follows:
when D is present1＝D2When is, P1＝P2；
When D is present1≠D2When is, P1≠P2。
4. The method of selecting a precision measurement value for a pipe flow compensated pressure point of claim 2, wherein the method comprises selecting the measurement value from a precision measurement value of a pipe flow compensated pressure pointComparison
Figure FDA0002487637210000021
And
Figure FDA0002487637210000022
the size of (A) comprises the following steps:
a first flow rate sensor is arranged in the gas meter, and a second flow rate sensor is arranged in a gas transmission pipeline communicated with the gas meter;
under the condition of gas introduction, the detection value of the first flow velocity sensor is acquired as a gas flow velocity V1Acquiring the detection value of the second flow rate sensor as the gas flow rate V2。
5. The method of claim 1, wherein the method comprises obtaining a pressure value P of a gas meter1And acquiring the air pressure value P in the gas transmission pipeline connected with the gas meter2The method specifically comprises the following steps:
a first pressure sensor is arranged in the gas meter, and a second pressure sensor is arranged in a gas transmission pipeline connected with the gas meter;
under the condition of gas introduction, the detection value of the first pressure sensor is acquired as an air pressure value P1Acquiring the detection value of the second pressure sensor as an air pressure value P2。
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