CN103616313B - A kind of gas density On-line Measuring Method - Google Patents
A kind of gas density On-line Measuring Method Download PDFInfo
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- CN103616313B CN103616313B CN201310624179.3A CN201310624179A CN103616313B CN 103616313 B CN103616313 B CN 103616313B CN 201310624179 A CN201310624179 A CN 201310624179A CN 103616313 B CN103616313 B CN 103616313B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 26
- 238000005259 measurement Methods 0.000 claims abstract description 26
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 50
- 239000012530 fluid Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000009514 concussion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
A kind of gas density On-line Measuring Method, it utilizes a measurement apparatus to complete parameter measurement, described measurement apparatus is made up of galvanostat, reducer, differential pressure pick-up and computer, the entrance of described galvanostat terminates tested gas, the port of export communicates with air through reducer, two air pressure input interfaces of described differential pressure pick-up pressure pipe with the throttle orifice both sides of reducer respectively is connected, and its signal output part connects the input port of computer；During test, make tested gas flow through galvanostat and reducer the most successively, measure the pressure differential △ P at reducer two ends simultaneously, then utilize following formula to calculate the density p of tested gas: ρ=2 × △ P/ (qV/C/(1‑β4)0.5×ε×π/4×d2)2.The present invention not only achieves the on-line measurement of gas density, and measurement apparatus simple in construction, with low cost, measurement structure accurately and reliably, for the accurate measurement of mixed gas flow and gas density accurately control create condition.
Description
Technical field
The present invention relates to a kind of method that can the most accurately measure mixed gas density, belong to field of measuring technique.
Background technology
Gas density is one of important parameter required in mixed gas (such as coal gas, natural gas etc.) flow measurement, only
Obtain gas density accurately, just can obtain gas flow accurately.Owing to the measurement difficulty of gas density is relatively big, existing
Flow metering method typically uses the way of discontinuous sampling analysis or estimation to determine gas density, greatly reduces metering essence
Degree, have impact on the fairness of charging.When measuring gas discharge such as each natural gas filling station, density parameter uses manual
Input, often results in the biggest trade dispute.To the metering of gas density with control also in town gas metering and commercial production
There is same problem.
Manoscopy method based on concussion principle can realize the accurate on-line measurement of gas density, described method
It is to allow tested gas enter a concussion cylinder, then tries to achieve gas according to the functional relationship of gas density with shake cylinder resonant frequency
Density value.But owing to this method is the highest to the requirement of shake cylinder machining accuracy and frequency measuring equipment resolution, thus meter
Manufacturing cost and the maintenance cost of amount device remain high, and significantly limit the promotion and application of metering device.
Summary of the invention
Present invention aims to the drawback of prior art, it is provided that a kind of new gas density On-line Measuring Method,
While ensureing certainty of measurement, reduce and measure cost.
Problem of the present invention realizes with following technical proposals:
A kind of gas density On-line Measuring Method, it utilizes a measurement apparatus to complete parameter measurement, described measurement apparatus
Being made up of galvanostat, reducer, differential pressure pick-up and computer, the entrance of described galvanostat terminates tested gas, port of export warp
Reducer communicates with air, two air pressure input interfaces of described differential pressure pick-up respectively with the taking of the throttle orifice both sides of reducer
Pressure pipe connects, and its signal output part connects the input port of computer；
During test, make tested gas flow through galvanostat and reducer the most successively, measure reducer two ends simultaneously
Pressure differential △ P, then utilize following formula calculate tested gas density p:
ρ=2×△P/(qV/C/(1-β4)0.5×ε×π/4×d2)2,
Wherein, qVThe volume flow set for galvanostat；C is efflux coefficient；D is the orifice diameter in the middle part of reducer；β
Ratio for the orifice diameter d and two ends tubing internal diameter D of reducer；ε is inflatable coefficient.
Above-mentioned gas density on-line measurement method, after the calculating completing tested gas density ρ, according to ideal gas formula
And temperature T of tested gas and pressure P, calculate tested gas density under the status of criterion (20 DEG C, an atmospheric pressure)
Value ρ0:
ρ0=ρ × (P0× T)/(P × T0)
Wherein, P0 、T0 It is respectively the absolute pressure under the status of criterion and absolute temperature.
Above-mentioned gas density on-line measurement method, for preventing the pressure oscillation of galvanostat arrival end from causing not to measurement result
Good impact, should arrange air relief valve at galvanostat arrival end and utilize pressure transducer to carry out the gas pressure of galvanostat arrival end
Monitoring.
The present invention calculates the density of tested gas according to the flowing principle of continuity and Bernoulli equation, not only achieves gas
The on-line measurement of density, and measurement apparatus simple in construction, with low cost, measurement structure accurately and reliably, for mixed gas flow
Accurate measurement and gas density accurately control create condition.
Accompanying drawing explanation
The invention will be further described below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of measurement apparatus used by the present invention；
Fig. 2 is the structural representation of reducer.
In figure, each list of reference numerals is: 1, air relief valve；2, galvanostat；3, reducer；4, temperature sensor；5, differential pressure sensing
Device；6, pressure transducer；7, computer；8, throttle orifice；9, pressure pipe.
In literary composition, symbol used is: △ P, differential pressure；ρ, density；qV, volume flow；C, efflux coefficient；D, orifice diameter；β:
The orifice diameter d of reducer and the ratio of two ends tubing internal diameter；ε: inflatable coefficient；ρ0 , tested gas under the status of criterion
Density；P0 , status of criterion absolute pressure；T0 , for status of criterion absolute temperature；The density of tested gas under ρ, actual condition；T、
The absolute pressure of tested gas under actual condition；The absolute temperature of tested gas under P, actual condition.
Detailed description of the invention
One. measurement apparatus
Referring to Fig. 1, the measurement apparatus used by the present invention mainly includes galvanostat 2, reducer 3, differential pressure pick-up 5 and calculates
Machine 7, the entrance of described galvanostat 2 terminates tested gas, and the port of export communicates with air through reducer 3, described differential pressure pick-up 5
Two air pressure input interfaces pressure pipe 9 with throttle orifice 8 both sides of reducer 3 respectively is connected, and its signal output part connects computer 7
Input port.
Outlet side at choke valve 3 is provided with temperature sensor 4, and its signal output part connects the input port of computer 7.?
The arrival end of galvanostat 2 is provided with air relief valve 1, and the pipeline between air relief valve 1 and galvanostat 2 is provided with gas pressure sensing
Device 6, the signal output part of gas pressure sensor 6 connects the input port of computer 7.
Two. theoretical foundation
The fluid of full pipeline throttling arrangement in piping, a fluid stream will form local contraction, then at throttling element
Before and after throttling element, create differential pressure (pressure differential) △ P, fluid can be derived according to the flowing principle of continuity and Bernoulli equation
Density p and differential pressure △ P and volume flow qVFunctional relationship:
qV=C/(1-β4)0.5×ε×π/4×d2×(2×△P/ρ)0.5,
ρ=2×△P/(qV/C/(1-β4)0.5×ε×π/4×d2)2,
Wherein, C: efflux coefficient；D: orifice diameter；The orifice diameter d of β: reducer and the ratio of two ends tubing internal diameter
Value；ε: inflatable coefficient.
Visible density ρ and differential pressure △ P and differential pressure qVThere is direct relation；Other relative parameter is stable, even if changing the most very
Little, can be solved by the method for calibration.At density p, differential pressure △ P, flow qVIn, if flow qVFixing then density p and
Differential pressure △ P is following relation:
ρ=K △ P,
K =2/(qV/C/(1-β4)0.5×ε×π/4×d2)2,
The most each parameter uses usually used as constant: qV: galvanostat volume flow, up to 0.2% degree of stability；C: for really
Fixed throttle orifice, gas flow can be considered constant when changing in the range of the 300% of setting value；β: constant；ε: with static pressure, differential pressure,
Isentropic index is relevant, and owing to fluid is directly discharged into air, differential pressure value itself is the least, so being considered as constant；D: orifice diameter, often
Number.When ambient parameter (such as atmospheric pressure, ambient temperature etc.) changes, above-mentioned parameter can be affected, at this moment may utilize
The method of standard sample gas calibration is modified.
Three. the principle of this method
1, make gas decompression, constant current, then make constant current gas continue through throttle orifice, by measuring throttling pin hole two continuously
The differential pressure of side, uses Bernoulli equation, is calculated under actual condition the density p of (measuring under temperature, differential pressure value) gas, then
The density p under bid condition (20 DEG C, under an atmospheric pressure) is calculated by ideal gas formula (PTV equation)0 :
ρ0=ρ × (P0× T)/(P × T0),
Wherein: ρ0、P0、T0 For the density of gas tested under the status of criterion, absolute pressure, absolute temperature；ρ, T, P are real
The density of tested gas, absolute pressure, absolute temperature under the operating mode of border.
Owing to directly leading to air after reducer, so force value used in ideal gas formula takes from differential pressure value.
2, galvanostat is used to make volume flow q of tested gasVKeep constant.
It addition, in Fig. 1 the effect of pressure transducer be monitor tested gas through the post-decompression pressure of air relief valve, this pressure must
Must be maintained in a less scope.The temperature using temperature sensor measurement gas is to actual condition density be converted
To mark condition density.
Claims (3)
1. a gas density On-line Measuring Method, is characterized in that, it utilizes a measurement apparatus to complete parameter measurement, described survey
Amount device is made up of air relief valve (1), galvanostat (2), reducer (3), differential pressure pick-up (5) and computer (7), described galvanostat
(2) arrival end connects tested gas through air relief valve, and the port of export communicates with air through reducer (3), described differential pressure pick-up (5)
Two air pressure input interfaces pressure pipe (9) with throttle orifice (8) both sides of reducer (3) respectively is connected, and its signal output part connects
The input port of computer (7)；
During measurement, make tested gas flow through air relief valve, galvanostat and reducer the most successively, measure reducer two ends simultaneously
Pressure differential △ P, then utilize following formula calculate tested gas density p:
ρ=2 × △ P/ (qV/C/(1-β4)0.5×ε×π/4×d2)2,
Wherein, qV is the volume flow that galvanostat sets；C is efflux coefficient；D is the orifice diameter in the middle part of reducer；β is joint
The ratio of the orifice diameter d and two ends tubing internal diameter D of stream device；ε is inflatable coefficient；
Gas pressure sensor (6), gas pressure sensor (6) are set on the pipeline between air relief valve (1) and galvanostat (2)
Signal output part connect the input port of computer (7), the tested gas of pressure sensor monitoring through the post-decompression pressure of air relief valve,
Described pressure preferably must be held in a less scope.
The most according to claim 1, gas density On-line Measuring Method, is characterized in that, at the meter completing tested gas density ρ
After calculation, also should utilize ideal gas formula and temperature T of tested gas and pressure P, calculate tested gas in the status of criterion
Density value ρ under (20 DEG C, an atmospheric pressure)0:
ρ0=ρ × (P0×T)/(P×T0),
Wherein, P0、T0It is respectively the absolute pressure under the status of criterion and absolute temperature.
Gas density On-line Measuring Method the most according to claim 1 or claim 2, is characterized in that, arranges pressure at galvanostat arrival end
The gas pressure of galvanostat arrival end is monitored by force transducer.
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| CN105784292A (en) * | 2016-03-09 | 2016-07-20 | 上海工程技术大学 | Piston air leakage amount measurement system based on balanced flow meter |
| CN109991043B (en) * | 2017-12-31 | 2022-07-05 | 中国人民解放军63653部队 | Differential pressure type gas taking measurement system based on high-temperature tube type atmosphere furnace |
| RU2676559C1 (en) * | 2018-02-14 | 2019-01-09 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тверской государственный технический университет" | Laboratory efficient analyzer of gas density |
| CN108414400B (en) * | 2018-04-19 | 2021-02-26 | 泉州市法尔机械科技有限公司 | Oil product viscosity determination method and system |
| CN111864232B (en) * | 2020-08-03 | 2021-12-21 | 上海重塑能源科技有限公司 | Gas purity detection method and hydrogen purity detection device of hydrogen supply system |
| CN114279888B (en) * | 2021-12-24 | 2023-11-21 | 华能山东石岛湾核电有限公司 | Pipeline gas content measuring method and device, storage medium and electronic equipment |
| CN114354054A (en) * | 2022-01-05 | 2022-04-15 | 东华工程科技股份有限公司 | Novel low-temperature corrosive gas online pressure or differential pressure continuous detection system |
| CN114199722A (en) * | 2022-01-17 | 2022-03-18 | 石家庄高新区中正仪器仪表有限公司 | Online gas density measurement method |
| CN117870619B (en) * | 2024-03-12 | 2024-05-24 | 云奕智创航空科技(南通)有限公司 | Air pressure height detection device and unmanned aerial vehicle |
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| CN1172164C (en) * | 2001-02-26 | 2004-10-20 | 电站锅炉煤清洁燃烧国家工程研究中心 | Method for measuring flow of dust-contained airflow and its in-line monitor |
| JP3655569B2 (en) * | 2001-09-06 | 2005-06-02 | 大陽日酸株式会社 | Gas component concentration measuring method and apparatus |
| CN101644652A (en) * | 2009-09-02 | 2010-02-10 | 湖南大学 | Differential pressure type density measurer and measuring method |
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Effective date of registration: 20170914 Address after: 050000 Hebei province Shijiazhuang City Xinshi North Road, No. 368 building, room 103 things Patentee after: Hebei Fang Fang automation equipment Technology Co., Ltd. Address before: 050000 Hebei province Shijiazhuang City Xinshi North Road, No. 368 building, room 105 things Patentee before: Qi Zenghai |