CN210215278U - Natural gas hydrate in-situ simulation and compression molding integrated system - Google Patents
Natural gas hydrate in-situ simulation and compression molding integrated system Download PDFInfo
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- CN210215278U CN210215278U CN201920856603.XU CN201920856603U CN210215278U CN 210215278 U CN210215278 U CN 210215278U CN 201920856603 U CN201920856603 U CN 201920856603U CN 210215278 U CN210215278 U CN 210215278U
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Abstract
The utility model discloses a natural gas hydrate normal position simulation and moulding-die shaping integration system, including full transparent sapphire reation kettle. The reaction kettle and the pressing die bin are arranged in a thermostatic chamber, the outer wall of the pressing die bin is provided with a temperature control jacket, and a bin body temperature sensor is arranged on the temperature control jacket. A kettle body pressure sensor, an upper temperature sensor and a lower temperature sensor are arranged on the reaction kettle provided with the electric stirrer. The two opposite sides outside the reaction kettle are provided with a cold light source and a high-speed camera. The pressing die bin comprises a columnar bin body, a sealing cover is mounted at one port of the bin body, a piston is movably mounted at the other port of the bin body, the sealing cover and the piston form a sealing cavity together, the end part of the piston, which extends out of the bin body, is connected with a driving motor, and a switch control valve is mounted on a pipeline and a pipeline which are used for communicating an inner cavity of the kettle body with the sealing cavity between the sealing cover and the reaction kettle. The utility model discloses a to the synthetic normal position simulation and the visual monitoring of decomposition of natural gas hydrate to can realize the preparation to the natural gas hydrate sample of normal position simulation.
Description
Technical Field
The utility model relates to a carry out normal position simulation and moulded die shaping's integrated system to natural gas hydrate belongs to the synthetic decomposition of natural gas hydrate and prepares technical field.
Background
Natural gas hydrates (also known as combustible ice) are widely distributed in nature not only in terrestrial sediments in arctic regions, but also in marine sediments in continents and below continental slopes in the oceans of the world. About 27% of land on earth is a potential area for gas hydrates to form, while about 90% of the area in the ocean is also a potential area. According to the combustible ice resource potential research report issued by the U.S. department of energy, the global combustible ice resource amount is predicted to be 20 trillion ton oil equivalent, which is approximately equivalent to the 'Kvenvolden recognized value'. The natural gas hydrate is used as a potential high-efficiency clean energy in the future, has the characteristics of wide distribution, large reserve, high density, high heat value and the like, is expected to break through the traditional energy structure, and becomes an ideal alternative energy in the future.
Although natural gas hydrate has great potential as future energy, exploration, exploitation and transportation of natural gas hydrate are different from conventional natural gas resources due to the particularity of geological conditions and occurrence forms, potential safety and environmental problems and the like. At present, natural gas hydrate needs to be stored in liquid nitrogen or a high-pressure low-temperature storage device due to the storage characteristics of low temperature and high pressure. The accurate test, transportation and storage of the gas content of the natural gas hydrate and the evaluation of the corresponding economic effect are hot spots of the current research.
At present, the types of devices for decomposing and synthesizing the natural gas hydrate are more, for example, the device disclosed in the Chinese patent 'natural gas hydrate simulation experiment device' with the patent number ZL201310364274.4 comprises longitudinal reaction equipment and transverse reaction equipment, a sapphire visible reaction kettle is additionally arranged, the generation of the natural gas hydrate can be visually observed, and the synthesis and decomposition of the natural gas hydrate can be effectively simulated. However, the device is similar to the existing natural gas hydrate decomposition and synthesis device, after the synthesis and decomposition processes are simulated and a series of parameters such as temperature, pressure distribution, hydrate saturation degree change and the like are obtained, the simulated natural gas hydrate is not reserved, and further research on the natural gas hydrate cannot be carried out.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a natural gas hydrate normal position simulation and moulding-die shaping integration system, it has realized the normal position simulation and the visual monitoring of natural gas hydrate synthesis with the decomposition to accessible moulding-die storehouse realizes the preparation to the natural gas hydrate sample of normal position simulation.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a natural gas hydrate normal position simulation and moulding-die shaping integration system which characterized in that: it includes full transparent sapphire reation kettle and the moulding-die storehouse, gas supply equipment, liquid supply equipment, gaseous sampling equipment and the liquid sampling equipment of cauldron body inner chamber intercommunication with full transparent sapphire reation kettle, wherein: the full-transparent sapphire reaction kettle and the pressing die bin are arranged in a thermostatic chamber, the outer wall of the pressing die bin is provided with a temperature control jacket, and a bin body temperature sensor is arranged on the temperature control jacket; a kettle body pressure sensor, an upper temperature sensor and a lower temperature sensor are arranged on the full-transparent sapphire reaction kettle which is provided with the electric stirrer, and a cold light source and a high-speed camera are respectively arranged on two opposite sides outside the full-transparent sapphire reaction kettle; the pressing die bin comprises a columnar bin body, a sealing cover is installed at one port of the bin body, a piston is movably installed at the other port of the bin body, the sealing cover and the piston form a sealing cavity, the end part of the piston, which extends out of the bin body, is connected with a driving motor, a pipeline for communicating the inner cavity of the bin body of the full-transparent sapphire reaction kettle with the sealing cavity formed in the pressing die bin is connected between the sealing cover and the full-transparent sapphire reaction kettle, and a switch control valve is installed on the pipeline; the full-transparent sapphire reaction kettle, the die pressing bin, the cold light source, the high-speed camera, the thermostatic chamber, the temperature control jacket, the gas supply device, the liquid supply device, the gas sampling device and the liquid sampling device are connected with the signal acquisition and control device.
The utility model has the advantages that:
the utility model discloses an aspect is by the reaction solution design of promoter or inhibitor, on the basis of normal position simulation and visual monitoring natural gas hydrate synthesis and decomposition process, can obtain the temperature, the pressure trend of change along with time and combine to calculate a series of materialization parameters such as saturation through the multi-parameter, for the actual effectiveness of studying natural gas hydrate "memory effect" provides reliable data support, on the other hand, borrow the preparation of mode pressing storehouse realization to the natural gas hydrate sample of normal position simulation, thereby on the basis of fully understanding the natural gas hydrate sample of normal position simulation, provide the synthetic natural gas hydrate sample for natural gas hydrate storage and indoor analysis, and can continue to carry out deeper research and analysis to this natural gas hydrate sample.
Drawings
Fig. 1 is a schematic diagram of the natural gas hydrate in-situ simulation and compression molding integrated system of the present invention.
Detailed Description
As shown in fig. 1, the utility model discloses natural gas hydrate normal position simulation and moulding-die shaping integration system includes full transparent sapphire reation kettle 10 and with moulding-die storehouse 70, air feeder, the confession liquid equipment, gaseous sampling equipment and the liquid sampling equipment of the cauldron body inner chamber intercommunication of full transparent sapphire reation kettle 10, air feeder is used for providing the natural gas and controlling cauldron body inner chamber pressure to full transparent sapphire reation kettle 10, supplies liquid equipment to be used for injecting reaction solution into full transparent sapphire reation kettle 10, wherein: the fully transparent sapphire reaction kettle 10 and the die pressing cabin 70 are arranged in a thermostatic chamber 60 with temperature control capability, the outer wall of the die pressing cabin 70 is provided with a temperature control jacket 80 for controlling the temperature in the die pressing cabin 70, a cabin temperature sensor (not shown in the figure) is arranged on the temperature control jacket 80, and the cabin temperature sensor can be arranged between the temperature control jacket 80 and the outer wall of the die pressing cabin 70; a kettle body pressure sensor 12 for collecting pressure parameters in the synthesis and decomposition process of the natural gas hydrate and upper and lower temperature sensors 13 and 14 for collecting temperature parameters in the synthesis and decomposition process of the natural gas hydrate are arranged on a full-transparent sapphire reaction kettle 10 provided with an electric stirrer 11, the upper temperature sensor 13 is arranged at the upper part of an inner cavity of the kettle body, the lower temperature sensor 14 is arranged at the lower part of the inner cavity of the kettle body, in addition, a safety valve 15 can also be arranged on the full-transparent sapphire reaction kettle 10, and a cold light source 22 for providing illumination light for shooting and a high-speed camera 21 for macroscopically monitoring the whole synthesis and decomposition process of the natural gas hydrate are respectively arranged at two opposite sides outside the full-transparent sapphire reaction kettle 10; the pressing die chamber 70 comprises a columnar (such as a cylinder-shaped) chamber body, the chamber body is made of metal materials with good heat conduction and cold conduction performance, a sealing cover 72 is arranged at one port of the chamber body, a piston 74, the chamber body and the sealing cover 72 are movably arranged at the other port of the chamber body, the piston 74 forms a sealed cavity with variable cavity volume together, the end part of the piston 74 extending out of the cabin body is connected with the driving motor 71, the piston 74 moves in the cabin body under the driving of the driving motor 71, the pressure in the sealed cavity formed by the die pressing cabin 70 can be calculated according to the distance of the driving motor 71 driving the piston 74 to move, a pipeline for communicating the inner cavity of the kettle body of the full-transparent sapphire reaction kettle 10 with the sealed cavity formed in the die pressing cabin 70 is connected between the sealed cover 72 and the full-transparent sapphire reaction kettle 10, a switch control valve 73 (such as a ball valve) is arranged on the pipeline, and a sand prevention filter plate can be arranged on the sealed cover 72; the signal ports of the fully transparent sapphire reaction kettle 10, the die pressing bin 70, the cold light source 22, the high-speed camera 21, the thermostatic chamber 60, the temperature control jacket 80, the gas supply device, the liquid supply device, the gas sampling device and the liquid sampling device are respectively connected with corresponding signal ports on the signal acquisition and control device (not shown in the figure).
The utility model discloses in, air supply equipment includes air inlet unit and air outlet means, wherein:
the gas inlet device comprises a natural gas steel bottle 40 for providing natural gas, the natural gas steel bottle 40 is communicated with a first gas inlet of a gas booster pump 43 through a pipeline in sequence through a first gate valve 41 and a second gate valve 42, an air compressor 44 is communicated with a second gas inlet of the gas booster pump 43 through a pipeline, and a gas outlet of the gas booster pump 43 is communicated with the inner cavity of the kettle body of the fully transparent sapphire reaction kettle 10 through a pressure reducing valve 45 and a gas inlet switch valve 46 in sequence through a pipeline;
the air outlet device comprises a vacuum pump 56, the vacuum pump 56 is communicated with the inner cavity of the full-transparent sapphire reaction kettle 10 through a vacuum buffer container 54 and an air outlet switch valve 53 in sequence through pipelines, and a vacuum degree display 55 is arranged on the pipeline between the vacuum pump 56 and the vacuum buffer container 54.
The utility model discloses in, gaseous sampling equipment is including admitting air the sampling device and giving vent to anger the sampling device, wherein:
the air inlet sampling device comprises an air inlet pressure sensor 47 and an air inlet collecting valve 48, wherein the air inlet pressure sensor 47 is installed at a first air inlet of the air booster pump 43, an air inlet of the air inlet collecting valve 48 is communicated with a pipeline between the second gate valve 42 and the first air inlet of the air booster pump 43 through a pipeline, and an air outlet of the air inlet collecting valve 48 is communicated with an air inlet collecting tank through a pipeline;
the gas outlet sampling device comprises a gas outlet pressure sensor 51 and a gas outlet sampling valve 52, the gas outlet pressure sensor 51 is installed at the gas inlet of the gas outlet switch valve 53, the gas inlet of the gas outlet sampling valve 52 is communicated with a pipeline connected with the gas inlet of the gas outlet switch valve 53, and the gas outlet of the gas outlet sampling valve 52 is communicated with a gas outlet sampling tank through the pipeline.
The utility model discloses in, the initial natural gas before the synthesis is gathered to gas sampling equipment mainly used, the residual gas after synthesis, decomposition, natural gas hydrate gas of resolving etc. The liquid sampling device is mainly used for collecting residual aqueous solution after synthesis and decomposition, natural gas hydrate analysis aqueous solution and the like.
In the present invention, the liquid supply apparatus includes a liquid injection pump 31 that supplies the reaction solution. In practical applications, the priming pump 31 may be a displacement pump.
The utility model discloses in, liquid sampling equipment include with the liquid valve 32 that adopts of the cauldron internal chamber intercommunication of full transparent sapphire reation kettle 10, install the liquid outlet of adopting the liquid valve 32 in full transparent sapphire reation kettle 10 bottom via pipeline and liquid collection tank intercommunication.
As shown in FIG. 1, a vent valve communicated with the inner cavity of the kettle body can be installed on the full-transparent sapphire reaction kettle 10, and the vent valve is used for completely exhausting gas and liquid in the inner cavity of the kettle body after the in-situ simulation is finished.
The utility model discloses in, because the moulding-die shaping must just can realize under the high pressure low temperature condition, need carry out accurate control to the seal chamber temperature of locating in the moulding-die storehouse 70, consequently, the utility model discloses installed one deck temperature control again on the outer wall of the moulding-die storehouse 70 in the thermostatic chamber 60 and pressed from both sides the cover 80, the temperature of seal chamber in the temperature control cover 80 can direct accurate control moulding-die storehouse 70, in other words, moulding-die storehouse 70 is under dual condensation, so become more sensitive, accurate in the aspect of temperature control.
The thermostatic chamber 60 can achieve temperature control by circulating a refrigerant fluid, which can be selected from organic solvents such as ethylene glycol according to the refrigeration temperature. The temperature control jacket 80 may be a refrigeration fluid jacket. The thermostatic chamber 60 and the temperature control jacket 80 are conventional devices in the art.
The cold light source 22 and the high-speed camera 21 are used for monitoring the macroscopic form change in the synthesis and decomposition processes of the natural gas hydrate in real time, so that a relation curve graph between the form of the synthesis and decomposition of the natural gas hydrate and the time can be accurately drawn. The cold light source 22 and the high-speed camera 21 are existing devices or devices in the field.
In practical design, the air inlet device and the air outlet device of the air supply device, the air inlet sampling device and the air outlet sampling device of the air sampling device, the liquid supply device and the liquid sampling device can also adopt other forming forms, and are not limited by the above. The respective devices in the gas supply apparatus, the gas sampling apparatus, the liquid supply apparatus, the liquid sampling apparatus, the valve body, and the like are well known in the art.
The signal acquisition and control equipment is mainly used for controlling the operation of the electric stirrer 11, the high-speed camera 21, the driving motor 71, the liquid injection pump 31, various valves and other related equipment and devices, receiving acquisition signals of the upper and lower temperature sensors 13 and 14, the bin body temperature sensor, the kettle body pressure sensor 12, the air inlet pressure sensor 47, the air outlet pressure sensor 51, the high-speed camera 21 and other related devices, summarizing, storing, processing, analyzing and displaying the received acquisition signals and the like. The signal acquisition and control device may include a single-chip or microprocessor, or may be a computer system, configured as is well known in the art.
In addition, the fully transparent sapphire reaction vessel 10 is a reaction vessel device existing in the field, so the composition and the working principle thereof are not described in detail.
Above-mentioned the utility model discloses natural gas hydrate normal position simulation and moulding-die shaping integration system's implementation process includes the step:
1) air tightness test (well known technique), with all valves closed;
2) the on-off control valve 73 is opened, the kettle body inner cavity of the full-transparent sapphire reaction kettle 10 is communicated with the sealed cavity in the pressing die bin 70, the full-transparent sapphire reaction kettle 10 and the pressing die bin 70 are vacuumized through the air outlet device of the air supply equipment, specifically, the on-off control valve 73 and the air outlet switch valve 53 are opened, the vacuum pump 56 is started, the full-transparent sapphire reaction kettle 10 and the pressing die bin 70 are vacuumized until the numerical value displayed by the vacuum degree display 55 reaches the preset pressure, the on-off control valve 73 and the air outlet switch valve 53 are closed, then the vacuum pump 56 is closed, and the vacuumizing operation is completed;
3) starting the liquid supply equipment, and injecting the reaction solution into the inner cavity of the kettle body of the fully transparent sapphire reaction kettle 10 through a liquid injection pump 31 of the liquid supply equipment;
4) gas inlet unit through gas supply equipment injects the natural gas into full transparent sapphire reation kettle 10 and makes full transparent sapphire reation kettle 10's cauldron internal chamber pressure reach assigned pressure (high pressure), wherein: when natural gas is injected, acquiring an initial natural gas sample before synthesis through an air inlet sampling device of gas sampling equipment, specifically, opening first and second gate valves 41 and 42, acquiring the initial natural gas sample through an air inlet acquisition valve 48, then closing the air inlet acquisition valve 48, starting a gas booster pump 43 and an air compressor 44, opening a pressure reducing valve 45 and an air inlet switch valve 46 after the pressure of the gas booster pump 43 reaches a set pressure, injecting a mixed gas of natural gas and air into the fully transparent sapphire reaction kettle 10, and closing the first gate valve 41 and stopping gas injection when the pressure of a kettle inner cavity of the fully transparent sapphire reaction kettle 10 reaches a specified pressure under the monitoring of a kettle pressure sensor 12;
5) start electric stirrer 11 and begin the stirring, after the cauldron internal chamber pressure of full transparent sapphire reation kettle 10 no longer reduces, stop the stirring, through liquid sampling equipment, open liquid valve 32 promptly, gather the natural gas supersaturated aqueous solution sample that forms in the cauldron internal chamber, then start thermostatic chamber 60, at upper and lower temperature sensor 13, 14 under the monitoring, when cauldron internal chamber temperature that will full transparent sapphire reation kettle 10 through thermostatic chamber 60 falls to appointed temperature (low temperature), start high-speed camera 21 and cold light source 22, shoot the gas hydrate synthetic process, wherein: in the process of synthesizing the natural gas hydrate, the temperature change is detected and recorded in real time through the upper temperature sensor 13 and the lower temperature sensor 14, the pressure change is detected and recorded in real time through the kettle pressure sensor 12, and meanwhile, the collection of a small-dose water sample and a small-dose gas sample is carried out;
6) when the pressure and the temperature of the inner cavity of the kettle body of the fully transparent sapphire reaction kettle 10 are continuously stable and unchanged, the synthesis of the natural gas hydrate is finished, and then after the synthesis of the natural gas hydrate is finished, under the monitoring of the upper and lower temperature sensors 13 and 14, the temperature of the inner cavity of the kettle body of the fully transparent sapphire reaction kettle 10 is raised to a preset decomposition temperature (such as normal temperature) through the thermostatic chamber 60, the high-speed camera 21 and the cold light source 22 are started again, and the decomposition process of the natural gas hydrate is shot, wherein: in the process of decomposing the natural gas hydrate, the temperature change is detected and recorded in real time through the upper temperature sensor 13 and the lower temperature sensor 14, the pressure change is detected and recorded in real time through the kettle body pressure sensor 12, and meanwhile, the collection of a small-dose water sample and a small-dose gas sample is carried out;
7) when the pressure and the temperature of the inner cavity of the full-transparent sapphire reaction kettle 10 are continuously stable and unchanged and no solid natural gas hydrate is observed in the inner cavity of the kettle body macroscopically, the decomposition of the natural gas hydrate is finished, then the electric stirrer 11 is started after the decomposition of the natural gas hydrate is finished, and the stirring is stopped when the pressure of the inner cavity of the kettle body of the full-transparent sapphire reaction kettle 10 is not reduced any more, so that a natural gas supersaturated aqueous solution is prepared in the inner cavity of the kettle body;
8) opening a switch control valve 73, injecting a natural gas supersaturated aqueous solution into a sealed cavity of a pressing die bin 70, starting a temperature control jacket 80 to perform external circulation freezing, reducing the temperature in the pressing die bin 70 to a specified temperature (low temperature) through the temperature control jacket 80 under the monitoring of a bin body temperature sensor, keeping for a period of time, starting a driving motor 71, enabling the driving motor 71 to drive a piston 74 to move so as to reduce the volume of the sealed cavity, stopping the driving motor 71 from operating until the pressure in the sealed cavity of the pressing die bin 70 rises to a specified pressure (high pressure), and then starting to synthesize a natural gas hydrate in the pressing die bin 70;
9) when the pressure and the temperature in the sealed cavity of the pressing die bin 70 are continuously stable and unchanged, the synthesis of the natural gas hydrate is finished, then the piston 74 is continuously and slowly pushed (slightly moved for a short distance, such as a distance of several millimeters) after the synthesis of the natural gas hydrate is finished, the synthesized natural gas hydrate is compacted, so that a columnar natural gas hydrate sample is pressed, namely the natural gas hydrate pressing die forming operation is finished, the pressure is released to the standard atmospheric pressure under the condition of keeping the specified temperature, the pressing die bin 70 is opened, and the columnar natural gas hydrate sample is taken out and placed in liquid nitrogen for freezing and standby;
10) thus, the in-situ simulation of the natural gas hydrate and the compression molding preparation of the natural gas hydrate sample are completed.
In the steps 5) and 6), the design of collecting small dose does not influence the temperature and the pressure of the inner cavity of the kettle body, and the small dose is usually in the order of several milliliters. The collection of the small-dose gas sample is realized by the gas outlet collection valve 52 of the gas outlet sampling device of the gas sampling apparatus, and the collection of the small-dose water sample is realized by the liquid sampling apparatus, i.e., the liquid collection valve 32.
In practical implementation, the synthesis of the natural gas hydrate needs to be carried out in a high-pressure low-temperature environment, the low-temperature is usually set to be-20 ℃, the high-pressure is 2-20 MPa, the preset decomposition temperature of the natural gas hydrate is usually set to be 20-50 ℃, and the specified parameters such as the temperature, the pressure and the like are reasonably designed according to practical situations and are not limited.
In the present invention, the reaction solution is an accelerator solution or an inhibitor solution, wherein:
the accelerant is any one or the combination of any more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, alkyl polyglycoside, linear alkyl sodium sulfonate, hexadecyl trimethyl ammonium bromide or nonyl phenol polyvinyl ether;
the inhibitor is a thermodynamic inhibitor or a kinetic inhibitor, wherein: the thermodynamic inhibitor is any one or combination of any more of sodium chloride, methanol, ethanol, glycol (frequently used) or salt reagents, and the kinetic inhibitor is any one or combination of any more of polyvinylpyrrolidone (PVP), five-membered ring vinylpyrrolidone, six-membered ring vinylpiperidinone or seven-membered ring vinylcaprolactam.
For example, the reaction solution is a 3% sodium chloride solution by mass, and the like.
After step 5) is performed, the saturation degree of the synthesized natural gas hydrate can be calculated.
In practical implementation, the saturation of the natural gas hydrate can be calculated by the following formula:
P0Vg0＝zng0RT01)
P’Vgr＝zngrRT’ 1’)
P’Vd＝zndRT’ 1”)
nc+ngr+nd＝ng0 2)
Vh+Vwr+Vgr＝Vp3)
Vh＝(nc×Mh)/ρh4)
Vwr＝Vw0-(NH×nc×Mw)/ρw5)
Vd＝(d×Vwr)/ρg6)
Sh＝Vh/Vp7)
ρh＝[v0exp(α1ΔT+α2ΔT2+α3ΔT3+α4ΔP)]-18)
wherein:
in formula 1): z is the natural gas compressibility coefficient calculated according to Redlich-Kwong formula (also called R-K equation), R is the molar gas constant 8.314J/mol K, P0、T0Respectively, the initial pressure, initial temperature, V, at the beginning of the synthesis of the natural gas hydrateg0Initial natural gas volume, n, for injection into the fully transparent sapphire reactor 10g0Is the initial natural gas molar mass.
Formula 1'): p 'and T' are respectively the pressure and temperature after the synthesis reaction of the natural gas hydrate, VgrFor the residual gas volume after the synthesis reaction, ngrIs the residual gas molar quantity after the synthesis reaction.
Formula 1 "): vdVolume of natural gas dissolved in residual aqueous solution, ndIs the molar amount of natural gas dissolved in the residual aqueous solution.
In formula 2): n iscIs the molar amount of natural gas participating in the synthesis reaction.
In formula 3): vhVolume of synthesized natural gas hydrate, VwrVolume of residual aqueous solution after the synthesis reaction, VpIs the volume of the inner cavity of the kettle body.
In formula 4): mh、ρhThe molar mass and density of the synthesized natural gas hydrate respectively.
In formula 5): vw0For the total volume of reaction solution injected, Mw、ρwThe molar mass and density of the reaction solution participating in the synthesis reaction are respectively.
Formula 6): d is the known solubility of natural gas hydrates in water at steady state, ρgIs the known density of natural gas at steady state.
Formula 7): shIs the saturation of natural gas hydrates.
Formula 8): rhohIs the density of natural gas hydrate,. DELTA.T ═ T' -T0，ΔP＝P’-P0，α1＝3.38486×10-4K-1，α2＝5.40099×10-7K-2，α3＝-4.76946×10-11K-3，α4＝10-10Pa-1，v0＝1000MH/(22.712NH)，MHIs the molar mass of natural gas hydrate, NHThe hydration constant of natural gas hydrate was taken as the average 6.
In practical implementation, the following steps may be further performed after step 9):
the inner cavity of the body of the fully transparent sapphire reaction kettle 10 is evacuated through the atmospheric valve 75 for the next test.
The utility model has the advantages that:
the utility model discloses an aspect is by the reaction solution design of promoter or inhibitor, on the basis of normal position simulation and visual monitoring natural gas hydrate synthesis and decomposition process, can obtain the temperature, the pressure trend of change along with time and combine to calculate a series of materialization parameters such as saturation through the multi-parameter, for the actual effectiveness of studying natural gas hydrate "memory effect" provides reliable data support, on the other hand, borrow the preparation of mode pressing storehouse realization to the natural gas hydrate sample of normal position simulation, thereby on the basis of fully understanding the natural gas hydrate sample of normal position simulation, provide the synthetic natural gas hydrate sample for natural gas hydrate storage and indoor analysis, and can continue to carry out deeper research and analysis to this natural gas hydrate sample.
The above description is the preferred embodiment of the present invention and the technical principle applied by the preferred embodiment, and for those skilled in the art, without departing from the spirit and scope of the present invention, any obvious changes based on the equivalent transformation, simple replacement, etc. of the technical solution of the present invention all belong to the protection scope of the present invention.
Claims (6)
1. The utility model provides a natural gas hydrate normal position simulation and moulding-die shaping integration system which characterized in that: it includes full transparent sapphire reation kettle and the moulding-die storehouse, gas supply equipment, liquid supply equipment, gaseous sampling equipment and the liquid sampling equipment of cauldron body inner chamber intercommunication with full transparent sapphire reation kettle, wherein: the full-transparent sapphire reaction kettle and the pressing die bin are arranged in a thermostatic chamber, the outer wall of the pressing die bin is provided with a temperature control jacket, and a bin body temperature sensor is arranged on the temperature control jacket; a kettle body pressure sensor, an upper temperature sensor and a lower temperature sensor are arranged on the full-transparent sapphire reaction kettle which is provided with the electric stirrer, and a cold light source and a high-speed camera are respectively arranged on two opposite sides outside the full-transparent sapphire reaction kettle; the pressing die bin comprises a columnar bin body, a sealing cover is installed at one port of the bin body, a piston is movably installed at the other port of the bin body, the sealing cover and the piston form a sealing cavity, the end part of the piston, which extends out of the bin body, is connected with a driving motor, a pipeline for communicating the inner cavity of the bin body of the full-transparent sapphire reaction kettle with the sealing cavity formed in the pressing die bin is connected between the sealing cover and the full-transparent sapphire reaction kettle, and a switch control valve is installed on the pipeline; the full-transparent sapphire reaction kettle, the die pressing bin, the cold light source, the high-speed camera, the thermostatic chamber, the temperature control jacket, the gas supply device, the liquid supply device, the gas sampling device and the liquid sampling device are connected with the signal acquisition and control device.
2. The natural gas hydrate in-situ simulation and compression molding integrated system of claim 1, wherein:
the air supply apparatus includes an air inlet device and an air outlet device, wherein:
the gas inlet device comprises a natural gas steel cylinder for providing natural gas, the natural gas steel cylinder is communicated with a first gas inlet of the gas booster pump through a pipeline in sequence through a first gate valve and a second gate valve, the air compressor is communicated with a second gas inlet of the gas booster pump through a pipeline, and a gas outlet of the gas booster pump is communicated with the inner cavity of the kettle body of the fully transparent sapphire reaction kettle through a pressure reducing valve and a gas inlet switch valve in sequence through a pipeline;
the air outlet device comprises a vacuum pump, and the vacuum pump is communicated with the inner cavity of the kettle body of the full-transparent sapphire reaction kettle through a vacuum buffer container and an air outlet switch valve in sequence through a pipeline.
3. The natural gas hydrate in-situ simulation and compression molding integrated system of claim 2, wherein:
the gas sampling apparatus comprises an inlet gas sampling device and an outlet gas sampling device, wherein:
the gas inlet sampling device comprises a gas inlet pressure sensor arranged at a first gas inlet of the gas booster pump, and a gas inlet collecting valve communicated with a pipeline between the second gate valve and the first gas inlet of the gas booster pump;
the gas outlet sampling device comprises a gas outlet pressure sensor arranged at the gas inlet of the gas outlet switch valve and a gas outlet sampling valve communicated with a pipeline connected with the gas inlet of the gas outlet switch valve.
4. The natural gas hydrate in-situ simulation and compression molding integrated system of claim 1, wherein:
the liquid supply apparatus includes an infusion pump that supplies a reaction solution.
5. The natural gas hydrate in-situ simulation and compression molding integrated system of claim 4, wherein:
the liquid sampling device comprises a liquid sampling valve communicated with the inner cavity of the kettle body of the full-transparent sapphire reaction kettle.
6. The integrated natural gas hydrate in-situ simulation and compression molding system of any one of claims 1 to 5, wherein:
and the fully transparent sapphire reaction kettle is provided with an emptying valve communicated with the inner cavity of the kettle body.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110066696A (en) * | 2019-06-05 | 2019-07-30 | 国家地质实验测试中心 | Gas hydrates insitu analog and pressing mold molding integral system and method |
| CN112834697A (en) * | 2020-12-30 | 2021-05-25 | 西南石油大学 | Mixed gas supply type visual natural gas hydrate experiment system |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110066696A (en) * | 2019-06-05 | 2019-07-30 | 国家地质实验测试中心 | Gas hydrates insitu analog and pressing mold molding integral system and method |
| CN112834697A (en) * | 2020-12-30 | 2021-05-25 | 西南石油大学 | Mixed gas supply type visual natural gas hydrate experiment system |
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