CN103616313A - On-line gas density measuring method - Google Patents
On-line gas density measuring method Download PDFInfo
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- CN103616313A CN103616313A CN201310624179.3A CN201310624179A CN103616313A CN 103616313 A CN103616313 A CN 103616313A CN 201310624179 A CN201310624179 A CN 201310624179A CN 103616313 A CN103616313 A CN 103616313A
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- galvanostat
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- pressure
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Abstract
The invention provides an on-line gas density measuring method which realizes the parameter measurement by utilizing a measuring device; the measuring device comprises a galvanostat, a throttle, a differential pressure sensor and a computer, wherein the inlet end of the galvanostat is connected with measured gas, and the outlet end of the galvanostat is communicated with air through the throttle; two air pressure input interfaces of the differential pressure sensor are connected with pressure sampling pipes at two sides of a throttle hole of the throttle, and the signal output end of the differential pressure sensor is connected with the input port of the computer; during testing, the measured gas continuously flows through the galvanostat and the throttle sequentially, the pressure difference Delta between two ends of the throttle are measured at the same time, then the density of the measured gas is calculated by using the following formula: p:p=2*deltaP/(qV/C/(1-Beta4)0.5*epsilon*Pi/4*d2)2. Due to the adoption of the method, not only is the on-line measurement of the gas density realized, but also the measuring device is simple in structure, low in cost, and exact and reliable in measuring structure, and furthermore, a condition is created for the accurate measurement of flow of mixed gas and the accurate control of gas density.
Description
Technical field
The present invention relates to a kind ofly can accurately measure online the method for mixed gas density, belong to field of measuring technique.
Background technology
Gas density is one of important parameter required in mixed gas (as coal gas, rock gas etc.) flow metering, only has and has obtained gas density accurately, just can obtain gas flow accurately.Because the measurement difficulty of gas density is larger, existing flow metering method generally adopts the way of discontinuous sampling analysis or estimation to determine gas density, greatly reduces measuring accuracy, has affected the fairness of charging.When gas discharge is measured as each natural gas filling station, density parameter adopts manual input, often causes very large trade dispute.In town gas metering and commercial production, also be there is to same problem in the metering of gas density and control.
Manoscopy method based on concussion principle can realize the accurate on-line measurement of gas density, and described method is to allow tested gas enter a concussion cylindrical shell, then according to gas density and the funtcional relationship of shake cylinder resonance frequency, tries to achieve the density value of gas.But because this method is all very high to the requirement of shake cylinder machining precision and frequency measuring equipment resolution, thus the manufacturing cost of measuring apparatus and maintenance cost high, greatly limited the promotion and application of measuring apparatus.
Summary of the invention
The object of the invention is to the drawback for prior art, a kind of new gas density On-line Measuring Method is provided, when guaranteeing measuring accuracy, 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 mechanism to complete parameter measurement, described measurement mechanism is comprised of galvanostat, flow controller, differential pressure pick-up and computing machine, the tested gas of entrance termination of described galvanostat, endpiece communicates with atmosphere through flow controller, two air pressure input interfaces of described differential pressure pick-up are connected with the pressure pipe of the throttle orifice both sides of flow controller respectively, and its signal output part connects the input port of computing machine;
During test, make tested gas flow through successively incessantly galvanostat and flow controller, measure the pressure differential △ P at flow controller two ends simultaneously, then utilize following formula to calculate the density p of tested gas:
ρ=2×△P/(q
V/C/(1-β
4)
0.5×ε×π/4×d
2)
2 ，
Wherein, q
vvolumetric flow rate for galvanostat setting; C is efflux coefficient; D is the throttle orifice diameter at flow controller middle part; β is the ratio of throttle orifice diameter d and the two ends pipeline inner diameter D of flow controller; ε is inflatable coefficient.
Above-mentioned gas density on-line measurement method, after the calculating that completes tested gas density ρ, according to the temperature T of ideal gas formula and tested gas and pressure P, calculates the density value ρ of tested gas under the status of criterion (20 ℃, an atmospheric pressure)
0:
ρ
0=ρ×（P
0×T）/（P×T
0）
Wherein, P
0, T
0be respectively absolute pressure and absolute temperature under the status of criterion.
Above-mentioned gas density on-line measurement method, for preventing that the pressure surge of galvanostat inlet end from causing harmful effect to measurement result, should arrange reduction valve and utilize pressure transducer to monitor the gaseous tension of galvanostat inlet end at galvanostat inlet end.
The present invention calculates the density of tested gas according to flow continuity principle and Bernoulli equation, not only realized the on-line measurement of gas density, and measurement mechanism is simple in structure, with low cost, measure structure accurately and reliably, for condition has been created in the accurate measurement of mixed gas flow and the accurate control of gas density.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is the structural representation of the present invention's measurement mechanism used;
Fig. 2 is the structural representation of flow controller.
In figure, each list of reference numerals is: 1, reduction valve; 2, galvanostat; 3, flow controller; 4, temperature sensor; 5, differential pressure pick-up; 6, pressure transducer; 7, computing machine; 8, throttle orifice; 9, pressure pipe.
In literary composition, symbol used is: △ P, differential pressure; ρ, density; q
v, volumetric flow rate; C, efflux coefficient; D, throttle orifice diameter; β: the ratio of the throttle orifice diameter d of flow controller and two ends pipeline internal diameter; ε: inflatable coefficient; ρ
0, the density of tested gas under the status of criterion; P
0, status of criterion absolute pressure; T
0, be status of criterion absolute temperature; The density of tested gas under ρ, actual condition; The absolute pressure of tested gas under T, actual condition; The absolute temperature of tested gas under P, actual condition.
Embodiment
One. measurement mechanism
Referring to Fig. 1, the present invention's measurement mechanism used mainly comprises galvanostat 2, flow controller 3, differential pressure pick-up 5 and computing machine 7, the tested gas of entrance termination of described galvanostat 2, endpiece communicates with atmosphere through flow controller 3, two air pressure input interfaces of described differential pressure pick-up 5 are connected with the pressure pipe 9 of throttle orifice 8 both sides of flow controller 3 respectively, and its signal output part connects the input port of computing machine 7.
Outlet side at throttling valve 3 is provided with temperature sensor 4, and its signal output part connects the input port of computing machine 7.Inlet end at galvanostat 2 is provided with reduction valve 1, on the pipeline between reduction valve 1 and galvanostat 2, is provided with gas pressure sensor 6, and the signal output part of gas pressure sensor 6 connects the input port of computing machine 7.
Two. theoretical foundation
The restriction device of the fluid that is full of pipeline in piping, a fluid stream will form at throttling element place local contraction, so produced differential pressure (pressure differential) △ P before and after throttling element, can derive fluid density ρ and differential pressure △ P and volumetric flow rate q according to mobile continuity principle and Bernoulli equation
vfuntcional relationship:
q
V=C/(1-β
4)
0.5×ε×π/4×d
2×(2×△P/ρ)
0.5 ，
ρ=2×△P/(q
V/C/(1-β
4)
0.5×ε×π/4×d
2)
2 ，
Wherein, C: efflux coefficient; D: throttle orifice diameter; β: the ratio of the throttle orifice diameter d of flow controller and two ends pipeline internal diameter; ε: inflatable coefficient.
Visible density p and differential pressure △ P and differential pressure q
vthere is direct relation; Other relative parameter is stable, even if it is also very little to change, can solve by the method for calibration.At density p, differential pressure △ P, flow q
vin, if flow q
vfixing density p and differential pressure △ P are following relation:
ρ=K△P，
K =2/(q
V/C/(1-β
4)
0.5×ε×π/4×d
2)
2 ，
Wherein each parameter is used usually used as constant: q
v: galvanostat volumetric flow rate, can reach 0.2% degree of stability; C: for definite throttle orifice, gas flow can be considered constant while changing in 300% scope of setting value; β: constant; ε: relevant with static pressure, differential pressure, isentropic index, because fluid directly enters atmosphere, differential pressure value itself is very little, so be considered as constant; D: throttle orifice diameter, constant.When environmental parameter (as atmospheric pressure, environment temperature etc.) changes, above-mentioned parameter can be affected, and the method for at this moment usable criterion sample gas calibration is revised.
Three. our ratio juris
1, make gas decompression, constant current, make again constant current gas pass through continuously throttle orifice, by the differential pressure of continuous coverage throttling pin hole both sides, adopt Bernoulli equation, calculate the density p of (measuring under temperature, differential pressure value) gas under actual condition, by ideal gas formula (PTV equation), calculate the density p under bid condition (20 ℃, under an atmospheric pressure) again
0:
ρ
0=ρ×（P
0×T）/（P×T
0），
Wherein: ρ
0, P
0, T
0density, absolute pressure, absolute temperature for tested gas under the status of criterion; ρ, T, P are density, absolute pressure, the absolute temperature of tested gas under actual condition.
Owing to directly leading to atmosphere after flow controller, so force value used is taken from differential pressure value in ideal gas formula.
2, adopt galvanostat to make the volumetric flow rate q of tested gas
vkeep constant.
In addition, in Fig. 1, the effect of pressure transducer is to monitor tested gas through the post-decompression pressure of reduction valve, and this pressure must remain in a less scope.The temperature that adopts temperature sensor measurement gas is for actual condition density being converted to mark condition density.
Claims (3)
1. a gas density On-line Measuring Method, it is characterized in that, it utilizes a measurement mechanism to complete parameter measurement, described measurement mechanism is comprised of galvanostat (2), flow controller (3), differential pressure pick-up (5) and computing machine (7), the tested gas of entrance termination of described galvanostat (2), endpiece communicates with atmosphere through flow controller (3), two air pressure input interfaces of described differential pressure pick-up (5) are connected with the pressure pipe (9) of throttle orifice (8) both sides of flow controller (3) respectively, and its signal output part connects the input port of computing machine (7);
During measurement, make tested gas flow through successively incessantly galvanostat and flow controller, measure the pressure differential △ P at flow controller two ends simultaneously, then utilize following formula to calculate the density p of tested gas:
ρ=2×△P/(q
V/C/(1-β
4)
0.5×ε×π/4×d
2)
2，
Wherein, q
vvolumetric flow rate for galvanostat setting; C is efflux coefficient; D is the throttle orifice diameter at flow controller middle part; β is the ratio of throttle orifice diameter d and the two ends pipeline inner diameter D of flow controller; ε is inflatable coefficient.
2. gas density On-line Measuring Method according to claim 1, it is characterized in that, after the calculating that completes tested gas density ρ, also should utilize temperature T and the pressure P of ideal gas formula and tested gas, calculate the density value ρ of tested gas under the status of criterion (20 ℃, an atmospheric pressure)
0:
ρ
0=ρ×（P
0×T）/（P×T
0），
Wherein, P
0, T
0be respectively absolute pressure and absolute temperature under the status of criterion.
3. according to gas density On-line Measuring Method described in claim 1 or 2, it is characterized in that, at galvanostat inlet end, reduction valve is set and utilizes pressure transducer to monitor the gaseous tension of galvanostat inlet end.
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|---|---|---|---|
| CN201310624179.3A CN103616313B (en) | 2013-11-29 | 2013-11-29 | A kind of gas density On-line Measuring Method |
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|---|---|---|---|
| CN201310624179.3A CN103616313B (en) | 2013-11-29 | 2013-11-29 | A kind of gas density On-line Measuring Method |
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| Publication Number | Publication Date |
|---|---|
| CN103616313A true CN103616313A (en) | 2014-03-05 |
| CN103616313B CN103616313B (en) | 2016-09-14 |
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ID=50167019
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108414400A (en) * | 2018-04-19 | 2018-08-17 | 泉州市法尔机械科技有限公司 | The determination method and decision-making system of oil viscosity |
| 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 |
| CN109991043A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | Differential pressure type based on high-temperature tubular atmosphere furnace takes gas measuring system |
| CN111864232A (en) * | 2020-08-03 | 2020-10-30 | 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 |
| 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 |
| CN114279888A (en) * | 2021-12-24 | 2022-04-05 | 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 |
| CN117870619A (en) * | 2024-03-12 | 2024-04-12 | 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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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109991043A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | Differential pressure type based on high-temperature tubular atmosphere furnace takes gas measuring system |
| 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 |
| CN108414400A (en) * | 2018-04-19 | 2018-08-17 | 泉州市法尔机械科技有限公司 | The determination method and decision-making system of oil viscosity |
| 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 |
| CN111864232A (en) * | 2020-08-03 | 2020-10-30 | 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 |
| CN114279888A (en) * | 2021-12-24 | 2022-04-05 | 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 |
| 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 |
| 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 |
| CN117870619A (en) * | 2024-03-12 | 2024-04-12 | 云奕智创航空科技(南通)有限公司 | Air pressure height detection device and unmanned aerial vehicle |
| 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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| CN103616313B (en) | 2016-09-14 |
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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 |