CN114199722A - Online gas density measurement method - Google Patents
Online gas density measurement method Download PDFInfo
- Publication number
- CN114199722A CN114199722A CN202210049569.1A CN202210049569A CN114199722A CN 114199722 A CN114199722 A CN 114199722A CN 202210049569 A CN202210049569 A CN 202210049569A CN 114199722 A CN114199722 A CN 114199722A
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- gas
- flowmeter
- orifice plate
- cylinder
- pipeline
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000001739 density measurement Methods 0.000 title claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 description 48
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 8
- 235000017491 Bambusa tulda Nutrition 0.000 description 8
- 241001330002 Bambuseae Species 0.000 description 8
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 8
- 239000011425 bamboo Substances 0.000 description 8
- 230000008676 import Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/26—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences
- G01N9/266—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences for determining gas density
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to an on-line gas density measuring method, which comprises the following steps in sequence: introducing part of gas with density to be measured into a gas flowmeter of a communicating vessel filled with liquid through a gas inlet, and measuring the volume F of the gas through the gas flowmeterVGenerating pressure difference in the gas flowmeter, and closing the gas inlet after the gas is introduced; connecting the air inlet with an orifice plate flowmeter, arranging a throttle orifice plate in the orifice plate flowmeter, arranging pressure sampling pipes on two sides of the throttle orifice plate respectively, opening the air inlet to discharge the gas in the gas flowmeter into the orifice plate flowmeter, measuring differential pressure through two groups of pressure sampling pipes, and measuring the gas volume F through the orifice plate flowmeterM(ii) a And calculating by a formula to obtain the gas density. The on-line gas density measuring method provided by the invention is simple and convenient to operate, and solves the problem of high cost of gas density measurement in the prior art.
Description
Technical Field
The invention belongs to the technical field of gas density measurement, and particularly relates to an online gas density measurement method.
Background
In gas trade settlement, such as metering of natural gas and coal gas, the density of the gas is an important parameter. Because China depends on import for a long time in the field and is expensive, the parameter is mostly avoided, numerous trade disputes are caused, and in the industrial production process, the gas density is also an important technical parameter and also depends on import.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an online gas density measuring method, which comprises the following steps in sequence:
step (1): introducing part of gas with density to be measured into a gas flowmeter of a communicating vessel filled with liquid through a gas inlet, and measuring the volume F of the gas through the gas flowmeterVGenerating pressure difference in the gas flowmeter, and closing the gas inlet after the gas is introduced;
step (2): connecting the air inlet with an orifice plate flowmeter, arranging a throttle orifice plate in the orifice plate flowmeter, arranging pressure sampling pipes on two sides of the throttle orifice plate respectively, opening the air inlet to discharge the gas in the gas flowmeter into the orifice plate flowmeter, measuring differential pressure through two groups of pressure sampling pipes, and measuring the gas volume F through the orifice plate flowmeterM：
Wherein: FM is the flow value of the orifice plate flowmeter; delta P is the differential pressure value of the orifice plate;
and (3): since the two flowmeters are in a series relationship:
FV＝FM
ρ＝K2×ΔP/FV 2
where K is a constant, the density of the gas can be calculated by the above formula.
Preferably, the gas flowmeter includes a section of thick bamboo and a B section of thick bamboo, a section of thick bamboo and B section of thick bamboo are the linker structure, a section of thick bamboo upper end sets up first pipeline, a B section of thick bamboo upper end sets up the second pipeline, set up first switching head and second switching head that admits air respectively on first pipeline and the second pipeline, all set up the liquid level electrode in a section of thick bamboo and the B section of thick bamboo, the liquid level electrode is connected with differential pressure transmitter.
In any of the above schemes, preferably, the orifice plate flowmeter includes a micro pipeline, the diameter of the micro pipeline is between 2-25mm, a throttle orifice plate is arranged in the micro pipeline, the micro pipeline is located on two sides of the throttle plate and is respectively provided with a positive pressure taking pipe and a negative pressure taking pipe, and the positive pressure taking pipe and the negative pressure taking pipe are connected with the differential pressure transmitter.
In any of the above aspects, preferably, the gas flow meter is arranged in series with the orifice flow meter.
The invention has the beneficial effects that: the on-line gas density measuring method provided by the invention is simple and convenient to operate, and solves the problem of high cost of gas density measurement in the prior art.
Drawings
FIG. 1 is a schematic view of a gas flow meter of the present invention;
FIG. 2 is a schematic view of an orifice plate flow meter of the present invention.
The figures are labeled as follows: 1-cylinder A; 2-B cylinder; 3-a first line; 4-a second line; 5-a first intake switching sub; 6-a second intake switching sub; 7-a liquid level electrode; 8-a differential pressure transmitter; 9-a micro pipeline; 10-a restriction orifice plate; 11-positive pressure tapping pipe; 12-negative pressure tapping pipe.
Detailed Description
In order that the invention may be further understood, the invention will now be described in detail with reference to specific examples.
As shown in fig. 1 and fig. 2, the present invention provides a device for measuring gas density, the device comprises a gas flowmeter and an orifice plate flowmeter which are arranged in series, the gas flowmeter comprises an a cylinder 1 and a B cylinder 2, the a cylinder 1 and the B cylinder 2 are in a communicating vessel structure and are internally provided with liquid, a first pipeline 3 is arranged at the upper end of the a cylinder 1, a second pipeline 4 is arranged at the upper end of the B cylinder 2, a first gas inlet switching head 5 and a second gas inlet switching head 6 are respectively arranged on the first pipeline 3 and the second pipeline 4, the first gas inlet switching head 5 and the second gas inlet switching head 6 can respectively block the first pipeline 3 and the second pipeline 4, liquid level electrodes 7 are respectively arranged in the a cylinder 1 and the B cylinder 2, the liquid level electrodes 7 are connected with a differential pressure transmitter 8, the differential pressure transmitter 8 can measure the volume of the input gas according to the information of the liquid level electrodes 7, however, the volume is not related to the gas density, the orifice plate flowmeter includes a micro pipeline 9, the diameter of the micro pipeline 9 is 2-25mm, a throttle orifice plate 10 is disposed in the micro pipeline 9, a positive pressure taking pipe 11 and a negative pressure taking pipe 12 are respectively disposed on two sides of the throttle plate 10 of the micro pipeline 9, and the positive pressure taking pipe 11 and the negative pressure taking pipe 12 are connected to a differential pressure transmitter, so that the differential pressure between the positive pressure taking pipe 11 and the negative pressure taking pipe 12 can be measured by the differential pressure transmitter.
The invention also provides a method for measuring the gas density on line by the structure, which comprises the following steps in sequence:
step (1): introducing part of gas with density to be measured into a gas flowmeter of a communicating vessel filled with liquid through a gas inlet, and measuring the volume F of the gas through the gas flowmeterVGenerating pressure difference in the gas flowmeter, and closing the gas inlet after the gas is introduced;
step (2): connecting the air inlet with an orifice plate flowmeter, arranging a throttle orifice plate in the orifice plate flowmeter, arranging pressure sampling pipes on two sides of the throttle orifice plate respectively, opening the air inlet to discharge the gas in the gas flowmeter into the orifice plate flowmeter, measuring differential pressure through two groups of pressure sampling pipes, and measuring the gas volume F through the orifice plate flowmeterM：
Wherein: fMThe flow value of the orifice plate flowmeter is obtained; delta P is the differential pressure value of the orifice plate;
and (3): since the two flowmeters are in a series relationship:
FV＝FM
ρ＝K2×ΔP/FV 2
where K is a constant, the density of the gas can be calculated by the above formula.
The method is simple and convenient to operate, and solves the problem that the gas density measurement cost is high in the prior art.
It will be understood by those skilled in the art that an on-line gas density measurement method of the present invention, including any combination of the summary and detailed description of the invention described above in the specification and illustrated in the accompanying drawings, is not limited to the space and does not describe every aspect of these combinations for the sake of brevity. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. An on-line gas density measurement method comprises the following steps in sequence:
step (1): introducing part of gas with density to be measured into a gas flowmeter of a communicating vessel filled with liquid through a gas inlet, and measuring the volume F of the gas through the gas flowmeterVGenerating pressure difference in the gas flowmeter, and closing the gas inlet after the gas is introduced;
step (2): connecting the air inlet with an orifice plate flowmeter, arranging a throttle orifice plate in the orifice plate flowmeter, arranging pressure sampling pipes on two sides of the throttle orifice plate respectively, opening the air inlet to discharge the gas in the gas flowmeter into the orifice plate flowmeter, measuring differential pressure through two groups of pressure sampling pipes, and measuring the gas volume F through the orifice plate flowmeterM：
Wherein: FM is the flow value of the orifice plate flowmeter; delta P is the differential pressure value of the orifice plate;
and (3): since the two flowmeters are in a series relationship:
FV＝FM
ρ＝K2×ΔP/FV 2
where K is a constant, the density of the gas can be calculated by the above formula.
2. The on-line gas density measuring method according to claim 1, wherein the gas flowmeter comprises a cylinder A and a cylinder B, the cylinder A and the cylinder B are in a communicating vessel structure, a first pipeline is arranged at the upper end of the cylinder A, a second pipeline is arranged at the upper end of the cylinder B, a first gas inlet switching head and a second gas inlet switching head are respectively arranged on the first pipeline and the second pipeline, liquid level electrodes are respectively arranged in the cylinder A and the cylinder B, and the liquid level electrodes are connected with a differential pressure transmitter.
3. The method according to claim 2, wherein the orifice flowmeter comprises a micro pipeline, the diameter of the micro pipeline is 2-25mm, a throttle orifice is arranged in the micro pipeline, the micro pipeline is positioned on two sides of the throttle plate and is respectively provided with a positive pressure taking pipe and a negative pressure taking pipe, and the positive pressure taking pipe and the negative pressure taking pipe are connected with a differential pressure transmitter.
4. An on-line gas density measurement method as claimed in claim 3, wherein the gas flow meter is arranged in series with the orifice flow meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210049569.1A CN114199722A (en) | 2022-01-17 | 2022-01-17 | Online gas density measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210049569.1A CN114199722A (en) | 2022-01-17 | 2022-01-17 | Online gas density measurement method |
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| Publication Number | Publication Date |
|---|---|
| CN114199722A true CN114199722A (en) | 2022-03-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210049569.1A Pending CN114199722A (en) | 2022-01-17 | 2022-01-17 | Online gas density measurement method |
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| CN (1) | CN114199722A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991015738A1 (en) * | 1990-04-02 | 1991-10-17 | Joram Agar | Improvements to two and three-phase flow measurement |
| WO1995002165A1 (en) * | 1993-07-03 | 1995-01-19 | Expro North Sea Limited | Apparatus and a method for measuring flow rate |
| US6058761A (en) * | 1998-01-30 | 2000-05-09 | Badger Meter, Inc. | Measurement of relative density of combustible gases |
| CN1934428A (en) * | 2004-03-25 | 2007-03-21 | 罗斯蒙德公司 | Simplified fluid property measurement |
| CN103616313A (en) * | 2013-11-29 | 2014-03-05 | 齐增海 | On-line gas density measuring method |
| CN107290008A (en) * | 2017-06-28 | 2017-10-24 | 中国石油天然气股份有限公司 | A kind of orifice plate vortex street gas-liquid metering device and its computational methods |
| CN109632036A (en) * | 2019-02-13 | 2019-04-16 | 靳殷实 | A kind of gas volume measurement displacement apparatus |
| CN110082048A (en) * | 2019-06-11 | 2019-08-02 | 靳殷实 | A kind of detection of gas flow rate device |
| CN112504378A (en) * | 2020-11-25 | 2021-03-16 | 北京环境工程技术有限公司 | Automatic metering device and method for gas volume |
| CN213090849U (en) * | 2020-09-18 | 2021-04-30 | 河北方矩自动化设备科技有限公司 | Small gas volume flow measuring device |
| CN213515805U (en) * | 2020-09-27 | 2021-06-22 | 河北方矩自动化设备科技有限公司 | Flow measuring device for microminiature high-pressure pipeline |
-
2022
- 2022-01-17 CN CN202210049569.1A patent/CN114199722A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991015738A1 (en) * | 1990-04-02 | 1991-10-17 | Joram Agar | Improvements to two and three-phase flow measurement |
| WO1995002165A1 (en) * | 1993-07-03 | 1995-01-19 | Expro North Sea Limited | Apparatus and a method for measuring flow rate |
| US6058761A (en) * | 1998-01-30 | 2000-05-09 | Badger Meter, Inc. | Measurement of relative density of combustible gases |
| CN1287616A (en) * | 1998-01-30 | 2001-03-14 | 英斯特美特有限公司 | Measurement of relative density of combustible gases |
| CN1934428A (en) * | 2004-03-25 | 2007-03-21 | 罗斯蒙德公司 | Simplified fluid property measurement |
| CN103616313A (en) * | 2013-11-29 | 2014-03-05 | 齐增海 | On-line gas density measuring method |
| CN107290008A (en) * | 2017-06-28 | 2017-10-24 | 中国石油天然气股份有限公司 | A kind of orifice plate vortex street gas-liquid metering device and its computational methods |
| CN109632036A (en) * | 2019-02-13 | 2019-04-16 | 靳殷实 | A kind of gas volume measurement displacement apparatus |
| CN110082048A (en) * | 2019-06-11 | 2019-08-02 | 靳殷实 | A kind of detection of gas flow rate device |
| CN213090849U (en) * | 2020-09-18 | 2021-04-30 | 河北方矩自动化设备科技有限公司 | Small gas volume flow measuring device |
| CN213515805U (en) * | 2020-09-27 | 2021-06-22 | 河北方矩自动化设备科技有限公司 | Flow measuring device for microminiature high-pressure pipeline |
| CN112504378A (en) * | 2020-11-25 | 2021-03-16 | 北京环境工程技术有限公司 | Automatic metering device and method for gas volume |
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