CN110672185B - Physical parameter calculation precision evaluation method of natural gas flow computer and application thereof - Google Patents
Physical parameter calculation precision evaluation method of natural gas flow computer and application thereof Download PDFInfo
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- CN110672185B CN110672185B CN201810711289.6A CN201810711289A CN110672185B CN 110672185 B CN110672185 B CN 110672185B CN 201810711289 A CN201810711289 A CN 201810711289A CN 110672185 B CN110672185 B CN 110672185B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 239000003345 natural gas Substances 0.000 title claims abstract description 22
- 238000004364 calculation method Methods 0.000 title claims abstract description 18
- 238000011156 evaluation Methods 0.000 title claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 69
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims description 27
- 230000000704 physical effect Effects 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 230000020169 heat generation Effects 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000012854 evaluation process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000002754 natural gas substitute Substances 0.000 description 1
Classifications
-
- 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
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to a physical parameter calculation precision evaluation method of a natural gas flow computer, which comprises the steps of firstly weighting ideal gas physical values of all components in a gas mixture according to respective corresponding mole fractions, and then adding all the components to obtain the physical values of the ideal gas mixture; by the application of the method, the accuracy of physical parameters of the flow computer can be accurately judged, so that errors of flow calculation are judged and corrected, and natural gas flow trade errors are reduced.
Description
Technical Field
The invention relates to a natural gas metering calculation method and application thereof.
Background
Natural gas is a high-quality, efficient and clean low-carbon energy source from 20 days in China, is widely used in China, and in recent years, the yield of the natural gas in China is rapidly increased, the import quantity is gradually increased year by year, and the consumption quantity is continuously increased. Quality and metering in the natural gas trade is increasingly receiving attention from governmental and social communities. The qualified quality and accurate measurement are directly related to the country enterprise and consumer interests. The natural gas physical parameter is taken as an important component of measurement, the calculation accuracy of the natural gas physical parameter directly influences the measurement quality of the whole computer, but at present, due to reasons of meter power consumption, inconsistent standard reference, inaccurate standard grasp and the like, the calculation of the physical parameter often omits calculation steps and parameters, and causes larger accuracy error of measurement.
Disclosure of Invention
The invention mainly aims at a flow computer widely applied to natural gas trade transaction at present, and according to international and domestic professional flow measurement standards, the invention discloses a method for evaluating the accuracy of physical parameters of a natural gas flow computer applied to trade settlement at present.
The specific technical scheme of the invention is as follows:
the invention provides a physical property parameter calculation accuracy evaluation method of a natural gas flow computer.
When the gas composition is known, the present method can be used to calculate the calorific value, density, relative density and wobbe index of dry natural gas, natural gas substitutes, and other gaseous fuels. When the method is used, the ideal gas physical property values of all components in the gas mixture are weighted according to the corresponding mole fractions, and then the physical property values of the ideal gas mixture are obtained after all the components are added. The physical property value based on the volume is converted into a physical property value of a real gas by using a compression factor.
Calorific value calculation
(1) Molar heat generation
Ideal gas:
true gas:
and is regarded as equal to the ideal gas mass heating value.
(2) Mass heating value
Ideal gas:
conditions are as follows: known composition and ideal molar heating value
M＝x j ·M j
Or (b)
Conditions are as follows: knowing the ideal mass heating value of component and component j
True gas:
the true gas mass heating value is considered to be equal to the ideal gas heating value in value.
(3) Volumetric heat generation
Ideal gas:
conditions are as follows: known composition, environmental parameters and ideal molar heating value
Or (b)
Conditions are as follows: ideal gas volume heating value of known component j
True gas:
conditions are as follows: knowing the ideal gas volume heating and compression factors
(4) Calculation of relative Density, density and Wobbe index
1) Relative density of
Ideal gas:
true gas:
conditions are as follows: the ideal gas relative density, gas compression factor and dry air compression factor are known (where t and p are the measured reference conditions t2, p 2)
2) Density:
ideal gas:
true gas: (where t and p are the metering reference conditions t2, p 2)
3) Wobbe index:
ideal gas:
true gas:
conditions are as follows: the volumetric heating value of the real gas and the relative density of the real gas are known.
Drawings
Fig. 1 shows the results of evaluation of the physical property parameter calculation accuracy of the natural gas flow rate computer of example 1.
Fig. 2 shows the results of evaluation of the physical property parameter calculation accuracy of the natural gas flow rate computer of example 2.
Detailed Description
The invention mainly provides and invents a method for calculating and evaluating the accuracy of physical parameters of a natural gas flow computer, realizes an evaluation process through a software system, and solves the technical problem that the accuracy of the physical parameters of the current flow computer cannot be evaluated and checked. According to the invention, the accurate measurement and evaluation of the flow measurement precision of the natural gas flow computer are realized, the flow measurement trade value is accurately calculated and checked, the natural gas trade error is reduced, and the method has great economic benefit and social significance. The following figures are examples of evaluation and data analysis of existing flow computer physical parameters using the method of the invention:
the parameter error of the current flow computer is accurately judged as shown in fig. 1 and 2, and an error value is given. The results of the evaluation of the physical property parameter calculation accuracy of the natural gas flow rate computers in examples 1 and 2 were obtained.
Claims (2)
1. A physical property parameter calculation precision evaluation method of a natural gas flow computer,
firstly, weighing ideal gas physical property values of all components in a gas mixture according to respective corresponding mole fractions, and then adding all the components to obtain the physical property values of the ideal gas mixture; wherein:
calorific value calculation
(1) Molar heat generation
Ideal for gas:
the total molar heating value of ideal gas of the mixed gas;
x j a mole fraction of the j component;
the total ideal molar heating value for the j component;
true gas:
the heating value is equal to the ideal gas mass;
(2) Mass heating value
Ideal for gas:
conditions are as follows: known composition and ideal molar heating value
M＝x j ·M j
Or (b)
Conditions are as follows: knowing the ideal mass heating value of component and component j
The high-order heating value of ideal gas of the mixture based on mass;
m is the molar mass of the mixed gas;
M j molar mass of the j component;
true gas:
the true gas mass heating value is considered as equal to the ideal gas heating value in value;
(3) Volumetric heat generation
Ideal gas:
conditions are as follows: known composition, environmental parameters and ideal molar heating value
Or (b)
Conditions are as follows: ideal gas volume heating value of known component j
True gas:
conditions are as follows: knowing the ideal gas volume heating and compression factors
Heating value of the mixed gas based on ideal gas volume; r is molar gas constant;
T 2 absolute temperature;
p 2 is the pressure;
heating value for j component total volume;
Z mix (t 2 ,p 2 ) For measuring reference condition t 2 ,p 2 A gas compression factor;
(4) Calculation of relative Density, density and Wobbe index
1) Relative density of
Ideal gas:
true gas:
conditions are as follows: knowing the ideal gas relative density, gas compression factor and dry air compression factor, t and p are the metered reference conditions t 2 、p 2
d (t, p) is the relative density of the real gas;
d o is the relative density of the ideal gas;
M air molar mass of dry air of standard composition;
Z air (t, p) is the dry air compression factor;
2) Density:
ideal gas:
true gas: t and p are the metering reference conditions t 2 、p 2
ρ 0 (t, p) is the ideal gas density;
ρ (t, p) is the true gas density;
p is the pressure;
t is absolute temperature;
3) Living poise index
Ideal gas:
W 0 [t 1 ,V(t 2 ,p 2 )]wobbe index, which is the ideal gas;
heating value for ideal gas volume of component s;
true gas:
conditions are as follows: knowing the volumetric heating value of the real gas and the relative density of the real gas;
W[t 1 ,V(t 2 ,p 2 )]wobbe index for real gas;
the heating value is the true gas volume of the component s.
2. An application of the physical property parameter calculation precision evaluation method of a natural gas flow computer, which is used for judging the parameter error of a flow computer according to the evaluation method of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810711289.6A CN110672185B (en) | 2018-07-02 | 2018-07-02 | Physical parameter calculation precision evaluation method of natural gas flow computer and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810711289.6A CN110672185B (en) | 2018-07-02 | 2018-07-02 | Physical parameter calculation precision evaluation method of natural gas flow computer and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN110672185A CN110672185A (en) | 2020-01-10 |
| CN110672185B true CN110672185B (en) | 2024-04-16 |
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| CN201810711289.6A Active CN110672185B (en) | 2018-07-02 | 2018-07-02 | Physical parameter calculation precision evaluation method of natural gas flow computer and application thereof |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111899802B (en) * | 2020-06-12 | 2024-06-25 | 中国石油天然气股份有限公司 | Method, system, equipment and storage medium for detecting physical properties of mixture |
| CN114996636B (en) * | 2022-05-27 | 2024-07-23 | 国家石油天然气管网集团有限公司 | Method and system for calculating LNG density in real time |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1944608A1 (en) * | 2007-01-10 | 2008-07-16 | Sergey Ermishin | Measuring method for physical-chemical parameters of natural gas |
| CN101246035A (en) * | 2008-03-17 | 2008-08-20 | 成都康斯博科技有限责任公司 | Portable natural gas flow measuring and checking system |
| CN103542904A (en) * | 2013-10-29 | 2014-01-29 | 成都千嘉科技有限公司 | Fuel gas metering method and device based on energy metering |
| CN105807027A (en) * | 2016-03-16 | 2016-07-27 | 新奥科技发展有限公司 | Gas energy metering method and device |
| CN106295911A (en) * | 2016-08-30 | 2017-01-04 | 东方电子股份有限公司 | A kind of grid branch parameter evaluation method based on chromatographic assays |
-
2018
- 2018-07-02 CN CN201810711289.6A patent/CN110672185B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1944608A1 (en) * | 2007-01-10 | 2008-07-16 | Sergey Ermishin | Measuring method for physical-chemical parameters of natural gas |
| CN101246035A (en) * | 2008-03-17 | 2008-08-20 | 成都康斯博科技有限责任公司 | Portable natural gas flow measuring and checking system |
| CN103542904A (en) * | 2013-10-29 | 2014-01-29 | 成都千嘉科技有限公司 | Fuel gas metering method and device based on energy metering |
| CN105807027A (en) * | 2016-03-16 | 2016-07-27 | 新奥科技发展有限公司 | Gas energy metering method and device |
| CN106295911A (en) * | 2016-08-30 | 2017-01-04 | 东方电子股份有限公司 | A kind of grid branch parameter evaluation method based on chromatographic assays |
Non-Patent Citations (1)
| Title |
|---|
| 天然气发热量间接测量不确定度评估方法初探;蔡黎;唐蒙;迟永杰;;石油与天然气化工(第02期);全文 * |
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| PB01 | Publication | ||
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| TA01 | Transfer of patent application right |
Effective date of registration: 20200825 Address after: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Applicant after: China Petroleum & Chemical Corp. Applicant after: SHANGHAI INSTITUTE OF PROCESS AUTOMATION INSTRUMENTATION Address before: 200223 No. 103, Xuhui District, Shanghai, Caobao Road Applicant before: SHANGHAI INSTITUTE OF PROCESS AUTOMATION INSTRUMENTATION Applicant before: METERING RESEARCH CENTER, NATURAL GAS BRANCH OF CHINA PETROLEUM AND CHEMICAL Corp. |
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