CN207703293U - Measure the system that liquid nitrogen frozen hydrate sample decomposes release gas volume - Google Patents
Measure the system that liquid nitrogen frozen hydrate sample decomposes release gas volume Download PDFInfo
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- CN207703293U CN207703293U CN201820124809.9U CN201820124809U CN207703293U CN 207703293 U CN207703293 U CN 207703293U CN 201820124809 U CN201820124809 U CN 201820124809U CN 207703293 U CN207703293 U CN 207703293U
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- Prior art keywords
- gas
- sample chamber
- sample
- liquid nitrogen
- measuring
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 239000007789 gas Substances 0.000 title claims abstract description 69
- 239000007788 liquid Substances 0.000 title claims abstract description 49
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 46
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 44
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000007789 sealing Methods 0.000 claims abstract description 27
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 22
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 22
- 150000004677 hydrates Chemical class 0.000 claims abstract description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 48
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 12
- 238000013461 design Methods 0.000 description 8
- 238000010494 dissociation reaction Methods 0.000 description 8
- 230000005593 dissociations Effects 0.000 description 8
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 108010066057 cabin-1 Proteins 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000790917 Dioxys <bee> Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003739 neck Anatomy 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Abstract
The utility model discloses a kind of systems that measurement liquid nitrogen frozen hydrate sample decomposes release gas volume, including at least a sealing device, the sealing device includes the sample chamber for storing gas hydrates sample and the tank for storing absorption, dissolving the solution of carbon dioxide gas in sealing device, and gas-liquid channel is provided between the sample chamber and the tank；The sample chamber is additionally provided with inlet channel, exhaust passage, pressure measuring unit and temperature measuring equipment for detecting the methane detector of methane content in sample chamber and for detecting pressure and temperature in sample chamber；The external carbon dioxide gas of inlet channel.The utility model is simple in structure, easy to operate, and testing result is reliable and stable.
Description
Technical field
The utility model is related to a kind of gas volume measuring system and measurement method more particularly to it is a kind of to liquid nitrogen frozen protect
The gas hydrates sample deposited decomposes the measuring system that the volume of release gas measures.
Background technology
Gas hydrates are also known as " combustible ice ", are distributed widely in the permafrost of halmeic deposit or land-based area, naturally
Gas and water can form the crystalline material of class ice-like under the conditions of high pressure low temperature, because of its appearance as ice and to meet fire i.e. flammable
It burns, so also referred to as " combustible ice ".Its Resource Density is high, and distribution on global is extensive, has high resource value, thus becomes
The hot spot that oil and gas industry circle studies for a long period of time.
With the continuous development of China's economic strength and science and technology, ocean gas hydrate tune is being greatly developed
It looks into.In May, 2017, the success of China Seas gas hydrates pilot production for the first time, on November 3rd, 2017, State Council's official approval will
Gas hydrates are classified as new mineral, become the 173rd, China mineral.
Since gas hydrates are extremely easy in decomposition into water and natural gas at normal temperatures and pressures, so laboratory preservation is natural
Gas hydrate sample needs to be put in freezen protective in liquid nitrogen (under normal pressure, liquid nitrogen temperature is -196 DEG C).Unit mass it is natural
The gas volume that gas hydrate sample discharges when decomposing is the important indicator for weighing gas hydrates purity, seabed is provided
The assessment of source amount is of great significance.
According to theoretical calculation, 1 cubic metre of combustible ice can be converted into 164 cubic metres of natural gas and 0.8 cubic metre of water.But
It is that when being taken out due to the gas hydrates of the freezen protective in liquid nitrogen, a certain amount of liquid nitrogen can be attached to, liquid nitrogen volatilization releases
A large amount of nitrogen, these nitrogen can be mixed into the gas of gas hydrate dissociation release, measurement result can be caused deviation occur.
Therefore, there is an urgent need for study a kind of to release the nitrogen in liquid nitrogen with gas hydrate dissociation by those skilled in the art
The gas separation put, and to the measuring system that measures of gas volume of gas hydrate dissociation release.
Utility model content
In view of the drawbacks described above of the prior art, the utility model proposes it is a kind of liquid nitrogen frozen can be preserved it is natural
The volume that gas hydrate sample decomposes release gas measures, and measurement simple in structure, easy to operate, dependable performance system
System.
A kind of system for measuring liquid nitrogen frozen hydrate sample and decomposing release gas volume, includes at least a sealing device,
The sealing device includes sample chamber for storing gas hydrates sample and is absorbed, in dissolving sealing device for storing
The tank of the solution of carbon dioxide gas is provided with gas-liquid channel between the sample chamber and the tank；The sample
Cabin is additionally provided with inlet channel, exhaust passage, for detecting in sample chamber the methane detector of methane content and for detecting
The pressure measuring unit and temperature measuring equipment of pressure and temperature in sample chamber；The external carbon dioxide gas of inlet channel.
In some embodiments, the liquid for absorbing carbon dioxide in sealing device is that sodium hydroxide is molten
Liquid.
In some embodiments, a concentration of the 40% of the sodium hydroxide solution.
In some embodiments, sealing cover, the methane measuring instrument, the survey are provided at the top of the sample chamber
Warm device and the pressure measuring unit are respectively arranged on the sealing cover.
In some embodiments, it is provided in the gas-liquid channel and is opened and closing for controlling gas-liquid channel
First valve.
In some embodiments, the inlet channel is located at the bottom of the sample chamber, in the inlet channel
It is provided with the opening for controlling the inlet channel and the second ball valve closed；The exhaust passage is located at the sealing cover
On, the opening for controlling the exhaust passage and the third ball valve closed are provided in the exhaust passage.
The beneficial effects of the utility model：
The said structure design of the utility model, the volatilization temperature for fully taking into account liquid nitrogen is -196 degrees Celsius, and normal pressure
The characteristic that lower decomposition of hydrate temperature is -45 DEG C, due to there is the huge temperature difference between the two, so as to by means of air inlet
The carbon dioxide that channel is passed through so that the gas for the nitrogen and gas hydrate dissociation release that the liquid nitrogen volatilization that sample is taken out of generates
Body is kept completely separate, and fully reacts noresidue with the sodium hydroxide in tank after being completely exhausted out nitrogen.In addition, passing through setting
It is accurate easily to be carried out to the temperature, pressure and methane content of the gas in sample chamber in the detection device of sealing cover
It measures, the accurate of release gas volume is decomposed to freezing hydrate sample to by relatively simple structure design, realize
It measures.
Inlet channel is set to the bottom of sample chamber by above-mentioned structure design, takes full advantage of the density of carbon dioxide
More than the physical characteristic of nitrogen, it is ensured that the nitrogen in sample chamber is completely exhausted out, and ensure that the accuracy of measurement result.
Further, since the Packed gas tank of setting and tank in device, and between gas tank cabin and tank
It is provided with gas-liquid channel, the abundant reaction of the substance in cabin is thereby may be ensured that, ensure that the reliability of experimental result.
The measuring system of the utility model, due to being passed through for carbon dioxide gas, it is ensured that the nitrogen taken out of in liquid nitrogen
It is kept completely separate with the gas of gas hydrate dissociation release, and is filled with the sodium hydroxide solution in tank after taking nitrogen out of
Divide reaction noresidue, further ensures the accuracy of measurement result.
The technique effect of the design of the utility model, concrete structure and generation is made furtherly below with reference to attached drawing
It is bright, to be fully understood from the purpose of this utility model, feature and effect.
Description of the drawings
Fig. 1 is the structural schematic diagram of one embodiment of the utility model.
Specific implementation mode
As shown in Figure 1, present embodiment discloses a kind of measurement liquid nitrogen frozen hydrate samples to decompose release gas volume
System, the system include a sealing device, which includes the sample chamber 1 and use for storing gas hydrates sample
The tank 2 of the solution of carbon dioxide gas in sealing device is absorbed in storage.
As shown in Figure 1, gas-liquid channel 4 is provided between sample chamber 1 and tank 2, the setting of gas-liquid channel 4 so that sample
Between product cabin 1 and tank 2 formed a channel, gas-liquid channel 4 in the open state, gas between the two and liquid
It can mutually circulate, the first valve 5 opened and closed for controlling gas-liquid channel 4 is provided in gas-liquid channel 4.The present embodiment
In, the 5 preferred preferable ball valve of sealing performance of the first valve.It in other embodiments, can also be according to the other kinds of valve of selection
Door.
As shown in Figure 1, sample chamber 1 is additionally provided with inlet channel 6 and exhaust passage 7, wherein inlet channel 6 is located at sample
The bottom in cabin 1 is provided with the opening for controlling inlet channel and the second ball valve 61 closed in inlet channel 6；Exhaust passage 7
It is set on sealing cover 8, the opening for controlling exhaust passage and the third ball valve 71 closed is provided in exhaust passage 7.
6 external carbon dioxide gas of inlet channel, 2 memory of tank are placed with for absorbing, dissolving dioxy in sealing device
Change the sodium hydroxide solution of carbon.The carbon dioxide gas temperature being passed through from inlet channel 6 is relatively high, can promote in sample chamber
Gas hydrates sample be rapidly heated, be conducive to its decomposition.The concentration of sodium hydroxide solution is bigger, is more conducive to carbon dioxide
Absorption, but with the increase of concentration of sodium hydroxide solution, the corrosion of device is also enhanced, by a large amount of constantly experiment and
Consider, 40% sodium hydroxide solution is optium concentration.
In above-mentioned structure design, inlet channel 6 is set to the bottom of sample chamber 1, takes full advantage of carbon dioxide
Density is more than the physical characteristic of nitrogen, it is ensured that the nitrogen in sample chamber is completely exhausted out, and ensure that the accuracy of measurement result.
In other embodiments, sodium hydroxide solution can also be selected dense between 30%-45% according to specific circumstances
Degree.
As shown in Figure 1, sample chamber 1 is additionally provided with the methane detector 9 for detecting methane content in sample chamber 1 and uses
In pressure measuring unit 10, the temperature measuring equipment 11 of pressure and temperature in detection sample chamber.It is easy to operation for the ease of the installation of device,
The top of sample chamber 1 is provided with sealing cover 8, methane measuring instrument 9, temperature measuring equipment 10 and pressure measuring unit 11 are respectively arranged at sealing
On lid 8.
The said structure design of the utility model, the volatilization temperature for fully taking into account liquid nitrogen is -196 DEG C, and water under normal pressure
The characteristic that object decomposition temperature is -45 DEG C is closed, due to there is the huge temperature difference between the two, so as to by means of inlet channel
The carbon dioxide being passed through so that the nitrogen that the liquid nitrogen volatilization that sample is taken out of generates and the gas that gas hydrate dissociation discharges are complete
It is fully separating, and after being completely exhausted out nitrogen noresidue is fully reacted with the sodium hydroxide in tank.In addition, close by being set to
The detection device of capping easily can accurately survey the temperature, pressure and methane content of the gas in sample chamber
Amount, to by relatively simple structure design, realize the accurate survey for decomposing release gas volume to freezing hydrate sample
Amount.
The concrete application that the utility model measures the system that liquid nitrogen frozen hydrate sample decomposes release gas volume is as follows：
1) it is logical to close gas-liquid after tank 2 is full of for the sodium hydroxide solution that a concentration of 40% is poured into tank 2
Road 4.In the step, the amount of sodium hydroxide solution can select as needed, in order to exclude gas extra in tank, ensure
The accuracy of measurement result, preferably by the hydraulically full cabin of solution；
2) sealing cover 8 is opened, gas hydrates sample is placed in sample chamber bottom 3, sealing cover 8 is covered and opens exhaust
Channel 7, and carbon dioxide gas is passed through by inlet channel 6.In the process, since the boiling point of liquid nitrogen (- 196 DEG C) is much low
The temperature (- 45 DEG C) of gas hydrate dissociation under normal pressure, and the density of carbon dioxide is more than the density of nitrogen, so sample
In subsidiary liquid nitrogen be first volatilized into nitrogen, the carbon dioxide gas band being then continually fed into sample chamber 1 from inlet channel 6
Go out, is discharged by exhaust passage 7.When liquid nitrogen volatilizees completely, temperature can rise in sample chamber 1；
3) in sample chamber 1 temperature continue to rise, gas hydrates sample starts to decompose, and discharges methane gas
Body.When methane detector starts to detect that methane content increases severely in gas in sample chamber 1, you can think gas hydrates sample
Product start to decompose.At this point, closing inlet channel 6 and exhaust passage 7 immediately, sample chamber 1 is allowed to be in closed state.Opening is set to
First valve 5 of gas-liquid channel 4, makes sample chamber 1 and tank 2 be connected by gas-liquid channel 4, due to 40% in 2 tanks
Sodium hydroxide solution has strong absorption to carbon dioxide gas, so i.e. it is believed that the gas in 1 sample chamber is whole
Release generates when being decomposed from gas hydrates sample.Wait for the temperature according to the gas in sample chamber after the completion of being reacted in cabin
And pressure, you can calculate in sample chamber 1 from the gas decomposed in gas hydrates sample under normal temperature and pressure state
Volume.
The measurement method of the utility model, due to being passed through for carbon dioxide gas, it is ensured that the nitrogen taken out of in liquid nitrogen
It is kept completely separate with the gas of gas hydrate dissociation release, and is filled with the sodium hydroxide solution in tank after taking nitrogen out of
Divide reaction noresidue, further ensures the accuracy of measurement result.
The preferred embodiment of the utility model described in detail above.It should be appreciated that the ordinary skill people of this field
Member according to the present utility model can conceive without creative work makes many modifications and variations.Therefore, all this technology necks
Technical staff passes through logic analysis, reasoning or limited reality on the basis of existing technology according to the design of the utility model in domain
Available technical solution is tested, it all should be in the protection domain being defined in the patent claims.
Claims (6)
1. a kind of system for measuring liquid nitrogen frozen hydrate sample and decomposing release gas volume, which is characterized in that include at least one
Sealing device, the sealing device include sample chamber for storing gas hydrates sample and for store absorb, dissolving
It is logical to be provided with gas-liquid for the tank of the solution of carbon dioxide gas in sealing device between the sample chamber and the tank
Road；The sample chamber be additionally provided with inlet channel, exhaust passage, for detect the methane detector of methane content in sample chamber with
And pressure measuring unit and temperature measuring equipment for detecting pressure and temperature in sample chamber；The external carbon dioxide gas of inlet channel
Body.
2. measuring the system that liquid nitrogen frozen hydrate sample decomposes release gas volume as described in claim 1, feature exists
In the liquid for absorbing carbon dioxide in sealing device is sodium hydroxide solution.
3. measuring the system that liquid nitrogen frozen hydrate sample decomposes release gas volume as claimed in claim 2, feature exists
In a concentration of the 40% of the sodium hydroxide solution.
4. measuring the system that liquid nitrogen frozen hydrate sample decomposes release gas volume as claimed in claim 1 or 2, feature
It is, sealing cover, the methane measuring instrument, the temperature measuring equipment and pressure measuring unit difference is provided at the top of the sample chamber
It is set on the sealing cover.
5. measuring the system that liquid nitrogen frozen hydrate sample decomposes release gas volume as claimed in claim 4, feature exists
In, be provided in the gas-liquid channel for control gas-liquid channel open with close the first valve.
6. measuring the system that liquid nitrogen frozen hydrate sample decomposes release gas volume as claimed in claim 5, feature exists
In the inlet channel is located at the bottom of the sample chamber, is provided in the inlet channel for controlling the inlet channel
Opening with close the second ball valve；The exhaust passage is located on the sealing cover, is provided with and is used in the exhaust passage
Control the opening of the exhaust passage and the third ball valve closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820124809.9U CN207703293U (en) | 2018-01-25 | 2018-01-25 | Measure the system that liquid nitrogen frozen hydrate sample decomposes release gas volume |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820124809.9U CN207703293U (en) | 2018-01-25 | 2018-01-25 | Measure the system that liquid nitrogen frozen hydrate sample decomposes release gas volume |
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| Publication Number | Publication Date |
|---|---|
| CN207703293U true CN207703293U (en) | 2018-08-07 |
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| CN201820124809.9U Expired - Fee Related CN207703293U (en) | 2018-01-25 | 2018-01-25 | Measure the system that liquid nitrogen frozen hydrate sample decomposes release gas volume |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318100A (en) * | 2018-01-25 | 2018-07-24 | 广州海洋地质调查局 | Measure the system and method that liquid nitrogen frozen hydrate sample decomposes release gas volume |
-
2018
- 2018-01-25 CN CN201820124809.9U patent/CN207703293U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318100A (en) * | 2018-01-25 | 2018-07-24 | 广州海洋地质调查局 | Measure the system and method that liquid nitrogen frozen hydrate sample decomposes release gas volume |
| CN108318100B (en) * | 2018-01-25 | 2023-10-10 | 广州海洋地质调查局 | System and method for measuring volume of gas released by decomposing liquid nitrogen frozen hydrate sample |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180807 |
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| CF01 | Termination of patent right due to non-payment of annual fee |