CN106153494A - A kind of gas absorption desorption experiment system and method realizing constant voltage and constant volume - Google Patents
A kind of gas absorption desorption experiment system and method realizing constant voltage and constant volume Download PDFInfo
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- CN106153494A CN106153494A CN201610728639.0A CN201610728639A CN106153494A CN 106153494 A CN106153494 A CN 106153494A CN 201610728639 A CN201610728639 A CN 201610728639A CN 106153494 A CN106153494 A CN 106153494A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/02—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder
- G01N7/04—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder by absorption or adsorption alone
Abstract
The invention discloses a kind of gas absorption desorption experiment system and method realizing constant voltage and constant volume, including sample cell, with reference to pipe, pressure duct, vacuum pump, fast decompression valve, electromagnetic valve, Pressure gauge, gas cylinder, in high precision soft heating stove, pressure transducer, data handling system；Sample cell is arranged on a branch road of pressure duct end, is arranged on another branch road of pressure piping end with reference to pipe, connects and is connected with gas cylinder after converging with the pressure duct of sample cell with reference to pipe；Gas cylinder is arranged on the side of pressure duct, vacuum pump is arranged on the opposite side of pressure duct, fast decompression valve is arranged on gas exhaust piping, and soft heating stove is arranged on sample cell and drying pipeline interface bottom in high precision, and described pressure transducer is arranged on sample cell and the top with reference to pipe.Material can be carried out high temperature and high pressure gas adsorption-desorption test under constant voltage and constant volume, different materials is carried out adsorption-desorption test under the conditions of different temperature, pressure, granularity.
Description
Technical field
The present invention relates to a kind of high temperature and high pressure gas adsorption-desorption experimental technique, particularly relate to one and can realize constant voltage and perseverance
The gas absorption desorption experiment system and method held.
Background technology
Adsorption-desorption pilot system before is in process of the test, and in sample cell, gas pressure is continually changing, and is difficult to
Obtain under constant pressure condition, the adsorption-desorption characteristics of material, thus obtain is the adsorption-desorption situation in the case of transformation.
Owing to, in adsorption-desorption process of the test, system constantly absorbs/release heat, it is difficult to the temperature of Control experiment, and then is difficult to
The adsorption-desorption characteristics of material under steady temperature.
Current assay device carries out the test data that gas absorption desorption experiment obtains, for research material in constant voltage feelings
Adsorption-desorption rule under condition still has deficiency, for estimating also of the coal and gas prominent amount in engineering practice and gas pumping amount
There is certain deviation.
Summary of the invention
It is an object of the invention to provide a kind of gas absorption desorption experiment system and method realizing constant voltage and constant volume.
It is an object of the invention to be achieved through the following technical solutions:
The realized constant voltage of the present invention and the gas absorption desorption experiment system of constant volume, including sample cell, with reference to pipe, high pressure
Pipeline, vacuum pump, fast decompression valve, electromagnetic valve, Pressure gauge, gas cylinder, in high precision soft heating stove, pressure transducer, number
According to processing system；
Described sample cell is arranged on a branch road of pressure duct end, and described reference pipe is arranged on pressure piping end
Another branch road on, connect to converge with the pressure duct of sample cell with reference to pipe and be connected with gas cylinder afterwards；
Described gas cylinder is arranged on the side of pressure duct, and described vacuum pump is arranged on the opposite side of pressure duct, institute
Stating fast decompression valve to be arranged on gas exhaust piping, described high accuracy soft heating stove is arranged under sample cell and drying pipeline interface
Portion, described pressure transducer is arranged on sample cell and the top with reference to pipe.
Above-mentioned the realized constant voltage of the present invention and the gas absorption desorption experiment system of constant volume realize gas absorption desorbing
The method of test, the test of described high temperature and high pressure gas adsorption-desorption includes following one or more:
Research temperature, pressure, the granularity affecting laws to material absorption property, including absorption constant, the rate of adsorption and suction
The Changing Pattern of attached amount；
Research temperature, pressure, the granularity affecting laws to material desorption performance, including desorption rate, the change of desorption quantity
Rule, especially material desorb into rule during atmospheric pressure；
Research different materials adsorption isotherm at different temperatures and desorption isotherm, and then calculate the heat of adsorption of material
And heat of desorption.
As seen from the above technical solution provided by the invention, the embodiment of the present invention provide realized constant voltage and constant volume
Gas absorption desorption experiment system and method, it is possible to material is carried out high temperature and high pressure gas absorption under constant voltage and constant volume
Desorption experiment.Different materials can be carried out adsorption-desorption test under the conditions of different temperature, pressure, granularity.
Accompanying drawing explanation
Realized constant voltage and the structure of the gas absorption desorption experiment system of constant volume that Fig. 1 provides for the embodiment of the present invention are shown
It is intended to.
In figure:
1:CH4 gas cylinder；2:He gas cylinder；3:CH4 gas cylinder total valve；4:He gas cylinder total valve；5-9: Pressure gauge；10-11: subtract
Pressure valve；12: pressure duct；13-24: signal valve；25: fast decompression valve；26-29: pressure transducer；30: with reference to pipe one；31:
Sample cell one；32: sample cell two；33: with reference to pipe two；34-35: soft heating stove in high precision；36: large cavity；37: drying pipeline
Interface；38: gas exhaust piping；39: vacuum pump；40: data handling system.
Detailed description of the invention
The embodiment of the present invention will be described in further detail below.
The realized constant voltage of the present invention and the gas absorption desorption experiment system of constant volume, its preferably detailed description of the invention
It is:
Including sample cell, with reference to pipe, pressure duct, vacuum pump, fast decompression valve, electromagnetic valve, Pressure gauge, gas cylinder,
Soft heating stove, pressure transducer, data handling system in high precision；
Described sample cell is arranged on a branch road of pressure duct end, and described reference pipe is arranged on pressure piping end
Another branch road on, connect to converge with the pressure duct of sample cell with reference to pipe and be connected with gas cylinder afterwards；
Described gas cylinder is arranged on the side of pressure duct, and described vacuum pump is arranged on the opposite side of pressure duct, institute
Stating fast decompression valve to be arranged on gas exhaust piping, described high accuracy soft heating stove is arranged under sample cell and drying pipeline interface
Portion, described pressure transducer is arranged on sample cell and the top with reference to pipe.
The described reference pipe other end is connected with large cavity by pressure duct, and is provided with electromagnetic valve on this pressure duct.
Above-mentioned the realized constant voltage of the present invention and the gas absorption desorption experiment system of constant volume realize gas absorption desorbing
The method of test, its preferably detailed description of the invention is:
Described gas absorption desorption experiment includes following one or more:
Research temperature, pressure, the granularity affecting laws to material absorption property, including absorption constant, the rate of adsorption and suction
The Changing Pattern of attached amount；
Research temperature, pressure, the granularity affecting laws to material desorption performance, including desorption rate, the change of desorption quantity
Rule, especially material desorb into rule during atmospheric pressure；
Research different materials adsorption isotherm at different temperatures and desorption isotherm, and then calculate the heat of adsorption of material
And heat of desorption.
The adsorption-desorption test under constant volume and constant-pressure conditions can be realized.
Described reference Guan You little cavity and large cavity both of which, realize switching by closing and open electromagnetic valve.
The precision of described pressure transducer reaches 0.01%FS, life-time service stability 0.025%FS.
The temperature control scope of described high accuracy soft heating stove is the interval arbitrary temp of room temperature-600 DEG C, and temperature-controlled precision is 0.1
℃。
During test, set relevant parameter in advance by test software interface, it is achieved automatization unmanned formula run with
And night automatically test, for different experimental conditions, set different adsorption and desorption conditions, and the suction under each pressure spot
The attached time can revise and come into force in real time.
The realized constant voltage of the present invention and the gas absorption desorption experiment system and method for constant volume, it is possible to material in constant voltage
With carry out high temperature and high pressure gas adsorption-desorption test under constant volume.Can be to different materials at different temperature, pressure, grain
Adsorption-desorption test is carried out under the conditions of degree.
In the present invention, gas cylinder is arranged on the side of pressure duct, is used for providing the gas of certain pressure to pilot system
Body.Vacuum pump is arranged on the opposite side of pressure duct, and in adsorption-desorption process of the test, the evacuation of sample cell processes.Quickly
Air relief valve is arranged on gas exhaust piping, quickly reduces sample overpressure to atmospheric pressure in desorption process.The softest
Property heating furnace is arranged on sample cell and drying pipeline interface bottom, for temperature during Control experiment.Pressure transducer is arranged on
Sample cell and the top with reference to pipe, for implementation record sample cell with reference to the gas pressure in pipe.
The present invention may be used for research material adsorption-desorption rule under the conditions of different temperature, pressure, granularity, permissible
For the relation of research material adsorbance/desorption quantity under the conditions of different temperature, pressure, granularity Yu time, and then to work
Coal and gas prominent amount, gas pumping amount in journey practice are estimated, and invention can be also used for studying the absorption of different materials
Heat and heat of desorption, make assessment for thermodynamic property during material adsorption-desorption.
Specific embodiment:
As it is shown in figure 1, adsorbent selects methane, adsorbate coal separation sample, as a example by sample cell one, describe the present invention's in detail
Detailed description of the invention, first selectes large cavity according to testing program or little cavity is tested, and concrete changing method is: beat
Open electromagnetic valve 21, then large cavity is just together with being connected on reference to pipe one.Then the software selecting corresponding large cavity just can enter
The large cavity adsorption-desorption test of row sample.Corresponding electromagnetic valve 21 of cutting out, then be only linked in pilot system with reference to pipe one,
Then the software selecting corresponding little cavity can be carried out the little cavity adsorption-desorption test of sample.
(1). with reference to pipe, sample cell and the calibration process of sample cell free space volumes
Needed the air-tightness of detecting system before on-test, it is ensured that it is good, then use vacuum to fill helium method and measure with reference to pipe
One and sample cell one and the volume of sample cell one free space, concretely comprise the following steps: open electromagnetic valve 14, electromagnetic valve 15, electromagnetism
Valve 17, cuts out other whole valves；Open He gas cylinder main valve 4 and regulate air relief valve 11 to the helium being filled with certain pressure with reference to pipe one
Gas；Close electromagnetic valve 14, electromagnetic valve 15, measure the pressure with reference to Guan Yiyu sample cell one, respectively Pc and Py；Open electromagnetic valve
18 make connect and make the two pressure equal with reference to Guan Yiyu sample cell one, and record the two pressure this moment is Pt.Open electromagnetic valve
15, fast decompression valve 25, discharges with reference to the gases at high pressure in pipe one, sample cell one, pipeline, selected calibrated bolck is put into sample
In pipe one, repeat the pressure before above step measures with reference to Guan Yiyu sample cell one connection and be respectively Pc1 and Py1, the two conducting
Rear pressure is Pt1.According to above measurement result and combine equation of state of real gas can be in the hope of with reference to Guan Yiyu sample cell one
Volume.Repeat above step (1)～(3) three times, ask its meansigma methods i.e. to can get sample cell one and the actual body with reference to pipe one
Long-pending Vc and Vy.Use same method can record the volume Vf of sample cell one free space.
(2). the adsorption-desorption process of sample in sample cell
Sample is can be carried out after having measured the volume with reference to pipe one and sample cell one and sample cell one free space
Adsorption-desorption is tested, and the adsorption-desorption process of the test of coal sample under constant volume and constant-pressure conditions is described separately below.
The adsorption-desorption process of the test of coal sample under a, constant volume
First turn on electromagnetic valve 15, electromagnetic valve 18, electromagnetic valve 24, close other whole valves, sample cell one is taken out
Vacuum.It is then shut off electromagnetic valve 18, electromagnetic valve 24, simultaneously opens solenoid valve 13, electromagnetic valve 17, is filled with a level pressure to reference to pipe one
The methane of power.It is then switched off electromagnetic valve 13, electromagnetic valve 15, opens electromagnetic valve 18, make to connect with sample cell one with reference to pipe one, treat two
Person's pressure reaches to close rapidly electromagnetic valve 17, electromagnetic valve 18 during balance, allows the coal sample in sample cell one sufficiently adsorb.?
In adsorption process, pressure transducer records the pressure of methane in a sample cell one every the Δ t time, by former and later two times
The pressure reduction of point calculates in each Δ t time interval the adsorption gas amount increment of coal sample in sample cell, when the suction of continuous 12 points
When attached gas amount increment sum is less than 0.0001cm3/g, then it can be assumed that reach balance, record adsorption equilibrium now for absorption
Pressure P1 and equilibrium adsorption capacity Q1.Then carry out adsorption test to the methane being filled with higher pressure with reference to pipe one, obtain correspondence
Adsorption equilibrium pressure Pi and equilibrium adsorption capacity Qi, (i=2,3,4,5,6,7.......), by a series of adsorption equilibrium pressure and right
The equilibrium adsorption capacity answered can be in the hope of absorption constant a and b of coal sample.When the adsorption test under all pressure spots has been carried out, open
Beginning desorption experiment.Open electromagnetic valve 15, electromagnetic valve 17, fast decompression valve 25, will discharge rapidly with reference to methane in pipe one, and now join
Examining pressure in pipe one is atmospheric pressure.The methane choosing whether to be filled with certain pressure in reference to pipe one is needed according to test, if
Test setting desorbs into atmospheric pressure, then be not required to open electromagnetic valve 13, electromagnetic valve 15, electromagnetic valve 17 are filled with one in reference to pipe one
The methane of constant-pressure.Otherwise, then need to carry out aforesaid operations.Then open electromagnetic valve 17, electromagnetic valve 18, close other all valves
Door, connection, with reference to pipe one and sample cell one, closes rapidly electromagnetic valve 17, electromagnetic valve 18 when the two pressure reaches balance, allows sample
Coal sample in QC one carries out sufficient desorbing.The record of data and judge method and the adsorption process class of balance in desorption process
Seemingly.After desorption experiment terminates, it is possible to obtain the isothermal adsorption of sample and desorption curve and adsorbance, desorption rate and time
Data.Finally open electromagnetic valve 17, electromagnetic valve 18, electromagnetic valve 15, fast decompression valve 25, the methane gas in removal system.
The adsorption-desorption process of the test of coal sample under b, constant-pressure conditions
First turn on electromagnetic valve 15, electromagnetic valve 18, electromagnetic valve 24, close other whole valves, sample cell one is taken out
Vacuum.It is then shut off electromagnetic valve 18, electromagnetic valve 24, simultaneously opens solenoid valve 13, electromagnetic valve 17, is filled with a level pressure to reference to pipe one
The methane of power.It is then switched off electromagnetic valve 13, electromagnetic valve 15, opens electromagnetic valve 18, make to connect with sample cell one with reference to pipe one, treat two
Person's pressure reaches to close rapidly electromagnetic valve 17, electromagnetic valve 18 during balance, and the coal sample in sample cell one starts adsorbed methane.In absorption
During, in sample cell one decreasing value of pressure with absorption set pressure ratio more than 1% time, open electromagnetic valve 17,
Electromagnetic valve 18, connection is with reference to pipe one and sample cell one, and regulation sample cell one is to former setting pressure rapidly, is then shut off electromagnetic valve
17, electromagnetic valve 18, coal sample continues adsorbed methane.The most constantly carry out adsorbing-regulate pressure treatment, until absorption pressure inside the tank
Decreasing value and absorption set the ratio of pressure and are less than 1%, at this moment allow coal sample fully adsorb, when the absorption watt of continuous 12 points
When this amount increment sum is less than 0.0001cm3/g, then assert that sample adsorption reaches balance.Record adsorption equilibrium pressure P1 now
With equilibrium adsorption capacity Q1.Then open electromagnetic valve 15, electromagnetic valve 17 and be filled with the methane of higher pressure to reference pipe one, more than repetition
Test procedure carries out adsorption test, obtains the adsorption equilibrium pressure Pi and equilibrium adsorption capacity Qi of correspondence, (i=2,3,4,5,6,
7.......), can be in the hope of absorption constant a and b of coal sample by a series of adsorption equilibrium pressure and equilibrium adsorption capacity.When all pressures
When adsorption test under force has been carried out, start desorption experiment.Open electromagnetic valve 15, electromagnetic valve 17, fast decompression valve 25, will ginseng
In examining pipe one, methane is discharged rapidly, and now in reference pipe one, pressure is atmospheric pressure.Choose whether to reference according to test needs
It is filled with the methane of certain pressure in pipe one, if test setting desorbs into atmospheric pressure, then is not required to open electromagnetic valve 13, electromagnetic valve
15, electromagnetic valve 17 is filled with the methane of certain pressure in reference to pipe one.Otherwise, then need to carry out aforesaid operations.Then electromagnetism is opened
Valve 17, electromagnetic valve 18, close other all valves, and connection is with reference to pipe one and sample cell one, fast when the two pressure reaches balance
Speed closes electromagnetic valve 17, electromagnetic valve 18, and the coal sample in sample cell one starts desorption of methane.The increase of pressure in sample cell one
When value and desorbing set the ratio of pressure more than 1%, open electromagnetic valve 17, electromagnetic valve 18, turn on reference to pipe one and sample cell one,
Regulation sample cell one, to former setting pressure, is then shut off electromagnetic valve 17, electromagnetic valve 18, and coal sample continues desorption of methane.The most continuous
Carry out desorbing-regulation pressure treatment, until the increase value of pressure and the ratio of desorbing setting pressure are less than 1% in sample cell one,
At this moment allowing coal sample carry out abundant desorbing, in desorption process, the record of data is similar with adsorption process with the method judging balance.Solve
Inhale after off-test, it is possible to obtain the data of the isothermal adsorption of sample and desorption curve and adsorbance, desorption rate and time.
Finally open electromagnetic valve 17, electromagnetic valve 18, electromagnetic valve 15, fast decompression valve 25, the methane gas in removal system.
Compared with other like products, it is an advantage of the current invention that:
1) instrument has little cavity and large cavity both of which, can be real by closing and open electromagnetic valve 21 or electromagnetic valve 22
This switching existing；
2) can be implemented in the adsorption-desorption test under constant volume and constant-pressure conditions；
3) instrument is furnished with import fast decompression valve 25, in sample desorption process, sample cell can be made as required intrinsic pressure
Power is reduced rapidly to atmospheric pressure；
4) instrument uses import high-precision pressure sensor, and precision reaches 0.01%FS, life-time service stability 0.025%
FS.The temperature regulating device of instrument is special high accuracy soft heating stove, and temperature control wide ranges reaches the interval arbitrary temp of room temperature-600 DEG C,
Temperature-controlled precision 0.1 DEG C；
5) during test, relevant parameter is set in advance by test software interface, it is achieved that automatization's unmanned formula fortune
Go and automatically test night；
6) for different experimental conditions, different adsorption and desorption conditions can be set.Such as the blowing pressure point is also
Can accurately set, and the adsorption-desorption time under each pressure spot can revise and come into force in real time, thus improve
The efficiency of test, has saved time cost.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope of present disclosure, the change that can readily occur in or replacement,
All should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be as the criterion.
Claims (8)
1. the gas absorption desorption experiment system that can realize constant voltage and constant volume, it is characterised in that include sample cell, reference
Pipe, pressure duct, vacuum pump, fast decompression valve, electromagnetic valve, Pressure gauge, gas cylinder, in high precision soft heating stove, pressure pass
Sensor, data handling system；
Described sample cell is arranged on a branch road of pressure duct end, and described reference pipe is arranged on the another of pressure piping end
On one branch road, connect and be connected with gas cylinder after converging with the pressure duct of sample cell with reference to pipe；
Described gas cylinder is arranged on the side of pressure duct, and described vacuum pump is arranged on the opposite side of pressure duct, described soon
Speed air relief valve is arranged on gas exhaust piping, and described high accuracy soft heating stove is arranged on sample cell and drying pipeline interface bottom,
Described pressure transducer is arranged on sample cell and the top with reference to pipe.
The gas absorption desorption experiment system realizing constant voltage and constant volume the most according to claim 1, it is characterised in that institute
State and connected with large cavity by pressure duct with reference to the pipe other end, and be provided with electromagnetic valve on this pressure duct.
3. the gas absorption desorption experiment system of the realized constant voltage described in claim 1 or 2 and constant volume realizes gas suction
The method of attached desorption experiment, it is characterised in that the test of described high temperature and high pressure gas adsorption-desorption includes following one or more:
Research temperature, pressure, the granularity affecting laws to material absorption property, including absorption constant, the rate of adsorption and adsorbance
Changing Pattern；
Research temperature, pressure, the granularity affecting laws to material desorption performance, including desorption rate, the Changing Pattern of desorption quantity,
Rule when especially material desorbs into atmospheric pressure；
Research different materials adsorption isotherm at different temperatures and desorption isotherm, and then the heat of adsorption calculating material conciliates
Heat absorption.
The method of gas absorption desorption experiment the most according to claim 3, it is characterised in that can realize in constant volume and constant voltage
Under the conditions of adsorption-desorption test.
The method of gas absorption desorption experiment the most according to claim 4, it is characterised in that described with reference to Guan You little cavity
With large cavity both of which, realize switching by closing and open electromagnetic valve.
The method of gas absorption desorption experiment the most according to claim 5, it is characterised in that the essence of described pressure transducer
Degree reaches 0.01%FS, life-time service stability 0.025%FS.
The method of gas absorption desorption experiment the most according to claim 6, it is characterised in that described high accuracy soft heating
The temperature control scope of stove is the interval arbitrary temp of room temperature-600 DEG C, and temperature-controlled precision is 0.1 DEG C.
The method of gas absorption desorption experiment the most according to claim 7, it is characterised in that during test, soft by test
Part interface sets relevant parameter in advance, it is achieved automatization's unmanned formula is run and automatically tests night, for different
Experimental condition, sets different adsorption and desorption conditions, and the adsorption time under each pressure spot can be revised and come into force in real time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610728639.0A CN106153494A (en) | 2016-08-25 | 2016-08-25 | A kind of gas absorption desorption experiment system and method realizing constant voltage and constant volume |
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| CN201610728639.0A CN106153494A (en) | 2016-08-25 | 2016-08-25 | A kind of gas absorption desorption experiment system and method realizing constant voltage and constant volume |
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| CN107063919A (en) * | 2017-04-05 | 2017-08-18 | 中国石油大学(华东) | Carbon dioxide and the device and method of alkane competitive Adsorption amount in a kind of measurement shale |
| CN109708993A (en) * | 2018-11-14 | 2019-05-03 | 中国石油天然气股份有限公司 | A kind of mud shale high pressure gas isothermal adsorption quantity measuring method and device |
| CN110296952A (en) * | 2019-08-02 | 2019-10-01 | 中国矿业大学(北京) | A kind of gas sensor calibration device and scaling method |
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| CN114136837A (en) * | 2021-10-28 | 2022-03-04 | 贝士德仪器科技(北京)有限公司 | Volumetric method constant-voltage tester and voltage control method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107063918A (en) * | 2016-12-28 | 2017-08-18 | 山东大学 | A kind of accurate adjustable coal grain adsorption-desorption rule of parameter determines device and method |
| CN107063919A (en) * | 2017-04-05 | 2017-08-18 | 中国石油大学(华东) | Carbon dioxide and the device and method of alkane competitive Adsorption amount in a kind of measurement shale |
| CN109708993A (en) * | 2018-11-14 | 2019-05-03 | 中国石油天然气股份有限公司 | A kind of mud shale high pressure gas isothermal adsorption quantity measuring method and device |
| CN109708993B (en) * | 2018-11-14 | 2021-08-03 | 中国石油天然气股份有限公司 | Method and device for measuring isothermal adsorption quantity of shale high-pressure gas |
| CN110296952A (en) * | 2019-08-02 | 2019-10-01 | 中国矿业大学(北京) | A kind of gas sensor calibration device and scaling method |
| CN110726640A (en) * | 2019-11-18 | 2020-01-24 | 中煤能源研究院有限责任公司 | Automatic determination device for coal sample gas adsorption constant |
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| CN112485175A (en) * | 2020-11-12 | 2021-03-12 | 武汉古生代检测科技有限公司 | Rock porosity measuring method and measuring device |
| CN114136837A (en) * | 2021-10-28 | 2022-03-04 | 贝士德仪器科技(北京)有限公司 | Volumetric method constant-voltage tester and voltage control method |
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Application publication date: 20161123 |