CN100373150C - Detector for gas solubility in liquid - Google Patents

Detector for gas solubility in liquid Download PDF

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Publication number
CN100373150C
CN100373150C CNB200610053819XA CN200610053819A CN100373150C CN 100373150 C CN100373150 C CN 100373150C CN B200610053819X A CNB200610053819X A CN B200610053819XA CN 200610053819 A CN200610053819 A CN 200610053819A CN 100373150 C CN100373150 C CN 100373150C
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CN
China
Prior art keywords
gas
liquid
cylinder
piston
pressure
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CNB200610053819XA
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Chinese (zh)
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CN1945275A (en
Inventor
范毓润
郭关柱
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浙江大学
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Priority to CNB200610053819XA priority Critical patent/CN100373150C/en
Publication of CN1945275A publication Critical patent/CN1945275A/en
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Publication of CN100373150C publication Critical patent/CN100373150C/en

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Abstract

The present invention is instrument for gas solubility in liquid. The instrument has stirring blades soaked in test liquid and connected to the shaft of torque motor, one cylinder with piston connected to a lead screw, one precise constant temperature water bath with temperature display for the cylinder to be set in, and one gas source connected to gas pipe and precise manometer, with the precise manometer being connected to the inner cavity of the cylinder through the axial hole in the piston. The present invention converts the rotation of the lead screw into the axial motion of the piston inside the cylinder to control the gas pressure in the liquid inside the cylinder cavity, and has precise measurement of temperature, piston displacement and in-cavity gas pressure. The gas amount over the liquid may be calculated based on the gas state equation and the dissolved gas amount may be obtained. The present invention is used in measuring gas content and solubility in liquid.

Description

Detector for gas solubility in a kind of liquid
Technical field
The present invention relates to the fields of measurement of the air content in the liquid, especially relate to the detector for gas solubility in a kind of liquid.
Background technology
Detector for gas solubility in the present employed liquid adopts the solubleness of volumetric method measurement gas in liquid more, gas injects liquid container after air circuit breaker enters buret through kapillary, the volume of dissolved gas is measured by buret before and after the experiment, the variation of slight pressure difference can be calculated by the difference in height of two mercury faces in the buret, ignore the volume in air circuit breaker and the kapillary, the difference in volume that buret tests out before and after the experiment is the volume of liquid institute dissolved gas, by the equation of gas state, by the amount of the pressure differential correction dissolved gas before and after the experiment.Measurement for gas solubility in the liquid under the high pressure, magnetic drive pump, high voltage bearing pipeline and the pressure gauge etc. that need be able to pressurize, liquid under high pressure constantly circulates and dissolved gas, after reaching gas-liquid and balancing each other, take out a part of fluid sample by sampler, measure the volume of this sample institute bubbing by buret, remaining gas is directly measured by gas chromatograph in this sample.
Shown in Figure 1 is a kind of structure principle chart of surveying detector for gas solubility in the low pressure liquid that oneself knows.Mainly the absorber 22, air circuit breaker 2, pressure gauge 9, kapillary 23 etc. that stir and inject solvent by: gas outlet 1, source of the gas 3, buret 20, Tempeerature-constant air bathroom 21, charged magnetic are formed.The temperature of buret 20 and absorber 22 is by Tempeerature-constant air bathroom 21 control, during test, enters buret 20 from the gas of source of the gas 3 through kapillary 23, and the volume in the buret is under atmospheric pressure measured.The spatial volume of ignoring kapillary 23 and solvent top enters by capillary pipeline 23 from the gas of buret 20, and contacts with solvent, and electromagnetic agitation reaches balance mutually up to gas-liquid.Gaseous tension in the absorption process also can be measured by pressure gauge 9 simultaneously by two mercury liquid levels of buret difference measurements.When absorption reach balance each other after, under atmospheric pressure can measure the residual volume of gas in the buret.
Shown in Figure 2 is the structure principle chart that known another kind can be measured the detector for gas solubility in the liquid under the high pressure.Mainly form by: buret 20, air circuit breaker 2, gas outlet 1, the gas of collecting 29, the gas circuit 28 of leading to gas chromatograph, gas storage container 27, highly pressurised liquid spirit-leveling instrument 25, sampler 24, Tempeerature-constant air bathroom 21, magnetic drive pump 26 etc.
The measuring principle of the detector for gas solubility under the high pressure in the liquid is similar a bit to principle shown in Figure 1.Than having increased sampler 24 and magnetic drive pump 26 etc., pipeline adopts the device that can bear high pressure.Liquid is by magnetic drive pump constantly circulation under high pressure, with gas storage container 27 in behind the abundant mixed dissolution of gas, reach gas-liquid phase equilibrium.By sampler 24 samplings, sample is under atmospheric pressure separated out dissolved gases 29 under the high pressure, and collects in the buret 20, and gas remaining in liquid is analyzed by gas chromatograph.
For the detector for gas solubility in the existing liquid, the deficiency of existence mainly contains 3 points: at first, the gas solubility under measurement low pressure and the high pressure in the liquid need adopt different surveying instruments respectively, causes measuring equipment more.Secondly, surveying instrument is formed complicated, and the manufacturing technology difficulty is big, the cost height.Once more, ignore solvent superjacent air space, pipeline isometric(al), and can't determine the influence of temperature variation, can cause measuring result error bigger vessel volume and Instrument measuring precision.
Summary of the invention
The object of the present invention is to provide the detector for gas solubility in a kind of liquid, be applicable to gas solubility test under low pressure and the high pressure, also can calculate the influence to measurement result of factors such as temperature variation and pipeline volume, obtain accurate relatively measurement result.
The technical solution adopted for the present invention to solve the technical problems is: in the bottom of cylinder body stirring vane is housed, stirring vane is immersed in the experimental liquid, stirring vane is connected with torque-motor outside the bottom that is assemblied in cylinder body through motor shaft, rotary seal is housed on the motor shaft, piston is housed in the cylinder body, one or more O-ring seals are installed on the piston, piston is positioned at the experimental liquid top, the piston upper end is connected with screw mandrel, the swivel nut that is connected with screw mandrel is fixed on the upper surface of cylinder body, and cylinder body is placed in the exact constant temperature water bath of band temperature demonstration; Source of the gas is connected with precision manometer with gas outlet respectively through second, third air circuit breaker behind first air circuit breaker again, and the axially extending bore of precision manometer on tracheae, piston is communicated with, and inserts the inner chamber of cylinder body.
The present invention compares the beneficial effect that has with background technology:
1. rotary screw rod moves piston vertically in cylinder body, thereby realizes liquid level top in the cylinder body is treated the pressure control (pressurization or decompression) of dissolved gas, and system's component part is few, and is simple in structure, and cost is low.
2. adopt the cylinder body of corrosion-resistant metal materials manufacturing, bubble is in the accurate water-bath that the band temperature shows, can make the liquids and gases in cylinder body and the cylinder body reach uniform and stable temperature within a short period of time, pressure and piston displacement by precision are measured, utilize the equation of gas state, dissolve or the amount of bubbing in the liquid before and after can accurately obtaining to test.
3. there is size accurately the shape of the cylinder body of corrosion resistant metal manufacturing and piston and position, by the material expansion coefficient, can calculate the shape of different temperatures lower cylinder body and piston and the exact value of position.It is considered in the measured data of experiment, make experimental measurements more accurate.
Therefore, it can apply to the saturation solubility measurement of gases such as air, nitrogen, ammonia in various different liquids.Be applicable to the measurement of the saturated air content of various high and low viscosity fluid; Can measure the gas solubility in the liquid under low pressure, high pressure, low temperature and the hot conditions.
Description of drawings
Fig. 1 is known a kind of structure principle chart of surveying detector for gas solubility in the low pressure liquid;
Fig. 2 is the structure principle chart that another kind can be measured the detector for gas solubility in the liquid under the high pressure;
Fig. 3 is the structure principle chart of the detector for gas solubility in the liquid of the present invention.
Among the figure: 1, gas outlet, 2, air circuit breaker, 3, source of the gas, 4, the exact constant temperature water bath that the band temperature shows, 5, cylinder body, 6, O-ring seal, 7, piston, 8, tracheae, 9, precision manometer, 10, swivel nut, 11, screw mandrel, 12, backstop, 13, bolt, 14, the gas cavity volume, 15, experimental liquid, 16, stirring vane, 17, rotary seal, 18, torque-motor, 19, seal closure, 20, buret, 21, the Tempeerature-constant air bathroom, 22, charged magnetic stirs and injects the absorber of solvent, 23, kapillary, 24, sampler, 25, the highly pressurised liquid spirit-leveling instrument, 26, magnetic drive pump, 27, gas storage container, 28, the gas circuit of leading to gas chromatograph, 29, the gas of collecting.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 3, stirring vane 16 is equipped with in the present invention in the bottom of cylinder body 5, stirring vane 16 is immersed in the experimental liquid 15, stirring vane 16 is connected with torque-motor 18 outside the bottom that is assemblied in cylinder body 5 through motor shaft, sealing function is played in rotary seal 17 on the motor shaft, the inner chamber and the ambient atmosphere of cylinder body 5 are separated, piston 7 is housed in the cylinder body 5, piston 7 is positioned at experimental liquid 15 tops, one or more O-ring seals 6 are installed on the piston 7, piston 7 upper ends are connected with screw mandrel 11, bolt 13 and backstop 12 are fixed on the lower end of screw mandrel 11 in the endoporus of piston 7 upper surfaces, the swivel nut 10 that is connected with screw mandrel 11 is fixed on the upper surface of cylinder body 5, and cylinder body 5 is placed on 4 li of the exact constant temperature water baths that the band temperature shows; Source of the gas 3 is behind first air circuit breaker 2, and again through tracheae 8, second, third air circuit breaker 2 is connected with precision manometer 9 with gas outlet 1 respectively, and the axially extending bore of precision manometer 9 on tracheae 8, piston 7 is communicated with, and inserts the inner chamber of cylinder body 5.
By tracheae 8, with gas outlet 1, source of the gas 3, precision manometer 9, the chamber of gas cavity volume 14 and experimental liquid 15 links together, also be connected with air circuit breaker 2 between two assemblies, be used to be switched on or switched off gas circuit, the air pressure of precision manometer 9 accurate measurement gas cavity volumes 14 and pipeline the inside, O-ring seal 6 seals, it separates the chamber and the ambient atmosphere at gas cavity volume 14 and experimental liquid 15 places, the exact constant temperature water bath 4 that the band temperature shows can make housing assembly, experimental gas and liquid are in isoperibol, source of the gas 3 can provide experimental liquid 15 dissolved gases, rotary screw rod 11, can make piston 7 in cylinder body 5, do axially-movable, to the chamber pressurization or the decompression (vacuumizing) at gas cavity volume 14 and experimental liquid 15 places.
Referring to Fig. 3, before the experiment, instrument is put into the exact constant temperature water bath 4 that the band temperature shows, pull down swivel nut 10 and connecting line, screw mandrel 11 and piston 7 are taken out, in cylinder body 5, inject volumetric experimental liquid 15, again piston is restored, swivel nut, connecting line and screw mandrel are installed, measure and note of the displacement of piston upper surface to the cylinder body upper surface, under the situation of known piston and cylinder body size, calculate the volume of liquid level top in the cylinder body.Measure the gas solubility of liquid under the negative pressure condition if desired, open the gas circuit that source of the gas 3 is connected with experimental liquid 15, gas cavity volume 14 ventilations to the liquid top, close gas circuit, rotary screw rod, piston is moved up, to gas cavity volume 14 decompressions of liquid and liquid top, note temperature, pressure and piston displacement are through after the long duration, the alternate balance that reaches of gas-liquid, the gaseous pressure of liquid level top is stabilized in certain certain value by reducing to become gradually, measures the pressure of this moment, can be calculated the amount of dissolved gas by the equation of gas state, divided by the volume of liquid, can this pressure and temperature environment under the gas solubility of this liquid.To torque-motor 18 power supplies, torque-motor 18 drives stirring vane 16 rotations, can shorten the alternate balance time that reaches of gas-liquid, thereby shortens the experiment consumed time.
The molal quantity computing formula of dissolved gas is as follows:
ΔG = P 0 V 0 RT 0 - P 1 V 1 RT 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ( 1 )
In the formula: the meltage of Δ G---gas; V 0, v 1Gas volume before and after---the be respectively experiment; p 0, p 1The pressure of liquid level top gas before and after---the be respectively experiment; The universal constant of R---dissolved gas; T 0, T 1Environment temperature before and after---the be respectively experiment.
Measure the gas solubility of liquid under the high-pressure situations if desired, after the ventilation, need the reverse rotation screw mandrel, to gas cavity volume 14 pressurizations of liquid and liquid top.Measure the gas solubility of a certain liquid under pressure if desired, need to adjust discontinuously the pressure in the gas cavity volume 14 in the experimentation, make gas phase and liquid phase reach balance after, pressure remains on needed pressure.
After the off-test, open air circuit breaker, gas in the experimental liquid 15 top gas cavity volumes 14 is bled off, pull down swivel nut 10 and connecting line, mention screw mandrel 11 and take out piston 7, liquid in the cylinder body 5 is poured in the liquid waste bottle, and piston, cylinder body and pipeline parts are cleaned up, and install to original position again.
Above-mentioned embodiment is used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.

Claims (1)

1. the detector for gas solubility in the liquid, it is characterized in that: stirring vane (16) is housed in the bottom of cylinder body (5), stirring vane (16) is immersed in the experimental liquid (15), stirring vane (16) is connected with torque-motor (18) outside the bottom that is assemblied in cylinder body (5) through motor shaft, rotary seal (17) is housed on the motor shaft, piston (7) is housed in the cylinder body (5), one or more O-ring seals (6) are installed on the piston (7), piston (7) is positioned at experimental liquid (15) top, piston (7) upper end is connected with screw mandrel (11), the swivel nut (10) that is connected with screw mandrel (11) is fixed on the upper surface of cylinder body (5), and cylinder body (5) is placed on exact constant temperature water bath (4) lining that the band temperature shows; Source of the gas (3) is connected with precision manometer (9) with gas outlet (1) respectively through second, third air circuit breaker (2) behind first air circuit breaker (2) again, and the axially extending bore of precision manometer (9) on tracheae, piston (7) is communicated with, and inserts the inner chamber of cylinder body (5).
CNB200610053819XA 2006-10-12 2006-10-12 Detector for gas solubility in liquid CN100373150C (en)

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CN101949913B (en) * 2010-09-03 2014-11-12 中国石油化工股份有限公司 Device and method for testing solubility of insoluble substance
CN102607902B (en) * 2011-01-21 2014-05-21 中国石油化工股份有限公司 Sealed canister for vacuum-desorbing physically-adsorbed hydrocarbon in soil
CN102393344B (en) * 2011-10-17 2014-08-20 中国石油化工股份有限公司 Device for measuring solubility of gas in liquid with higher boiling point and method
CN102607989A (en) * 2012-03-07 2012-07-25 中国石油天然气股份有限公司 Gas content testing device
CN106018163B (en) * 2012-06-06 2019-06-14 中国石油化工股份有限公司 A kind of system measuring the solubility parameter of gas in a liquid
US20140109650A1 (en) * 2012-10-22 2014-04-24 Seiko Epson Corporation Dissolved gas content measurement apparatus and liquid treatment apparatus
CN103674769B (en) * 2013-12-20 2016-04-20 中国石油大学(华东) A kind of gas dissolution flowmeter
CN103884623B (en) * 2014-03-28 2016-11-23 电子科技大学 A kind of measure the method that air in pure water dissolves or separates out the half period
CN103994945B (en) * 2014-06-09 2016-08-24 广西玉柴机器股份有限公司 The measurement apparatus of the gas content in a kind of engine coolant and method
CN104316434B (en) * 2014-10-21 2017-05-10 中国石油天然气股份有限公司 Device for measuring gas solubility in formation water
CN105987862B (en) * 2015-01-28 2019-03-19 珠海格力节能环保制冷技术研究中心有限公司 The test device and method of solubility and viscosity
CN104777072B (en) * 2015-04-24 2017-11-07 东南大学 A kind of survey calculation method of controllable pressure volume amendment type steam turbine oil air content
CN104990834B (en) * 2015-07-10 2018-05-11 广西玉柴机器股份有限公司 The measuring device and method of a kind of air content in coolant of engine
CN105806738B (en) * 2016-03-11 2018-04-17 西安交通大学 A kind of variable volume constant pressure arrangement and method for measuring gas solubility in a liquid
CN106093309B (en) * 2016-07-08 2018-06-12 南昌大学 Supercritical CO under the update condition of interface2The dissolution experiment device in polymer melt
CN109060605A (en) * 2018-08-29 2018-12-21 中国石油大学(华东) A kind of gas transfer performance testing device and test method
CN109341936A (en) * 2018-09-22 2019-02-15 武汉研润科技发展有限公司 Vapour-pressure test device
CN110210089B (en) * 2019-05-21 2021-02-09 华北电力大学 Liquid piston equivalent storage capacity model considering air solubility and simulation algorithm thereof

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CN1654952A (en) * 2004-02-13 2005-08-17 中国科学院大连化学物理研究所 Apparatus and method for measuring distribution constant of dissolved gas in transformer oil
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Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US5528923A (en) * 1992-12-21 1996-06-25 Ledez; Kenneth M. Gas amount and solubility investigation apparatus
US6974705B1 (en) * 2000-03-06 2005-12-13 Datalog Technology Inc. Method for determining the concentration of gas in a liquid
CN1654952A (en) * 2004-02-13 2005-08-17 中国科学院大连化学物理研究所 Apparatus and method for measuring distribution constant of dissolved gas in transformer oil

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