CN105651942A - Experimental system for displacing methane gas in hydrate by carbon dioxide - Google Patents
Experimental system for displacing methane gas in hydrate by carbon dioxide Download PDFInfo
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- CN105651942A CN105651942A CN201511028919.2A CN201511028919A CN105651942A CN 105651942 A CN105651942 A CN 105651942A CN 201511028919 A CN201511028919 A CN 201511028919A CN 105651942 A CN105651942 A CN 105651942A
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- carbon dioxide
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
Abstract
The invention discloses an experimental system for displacing methane gas in hydrate by carbon dioxide. The experimental system comprises a gas supply system, a temperature control system, a reaction system, a power system and a data acquisition system; a cycle way of enabling the carbon dioxide to enter the experimental system from the bottom of a reaction kettle and to come out of the experimental system from the top of the reaction kettle is adopted, so that heat transfer and mass transfer are enhanced in the carbon dioxide displacement process, and the displacement efficiency is increased; carbon dioxide gas separated by a membrane separator continuously takes part in a subsequent hydrate displacement reaction, and an experiment is carried out in a circulating way, so that the experiment cost is saved, and utilization efficiency of the experimental system is improved. The experimental system has an important guiding role in a practical mining method for displacing methane in natural gas hydrate by carbon dioxide.
Description
Technical field
The present invention relates to hydrate exploitation technology field, be specifically related in a kind of carbon dioxide replacement hydrate the experimental system of methane gas.
Background technology
Gas hydrates are by lower boiling hydro carbons gas (CH4��C2H6��C3H8Deng) the class ice type crystal that formed when cryogenic high pressure with hydrone. Gas hydrates are the novel clean high-quality resources that recent two decades finds in ocean and tundra, and whole world reserves are huge.
It is stored under earth's surface to reduce the carbon dioxide concentration in air after carbon dioxide is reclaimed, injects carbon dioxide into during methane hydrate is hidden and methane hydrate cage can be made to decompose, thus realizing the methane hydrate conversion to carbon dioxide hydrate. Above-mentioned technique can not only promote the recovery of methane gas, and carbon dioxide can maintain the mechanical stability of deposit after forming hydrate in deposit hole. With the methane in carbon dioxide replacement gas hydrates, by development of resources (clean energy resource production) with environmental conservation (greenhouse gases bury) in one. But due to the impact of heat transfer, mass transport process, carbon dioxide replacement process is slowly, it is necessary to study its replacement mechanism by experiment, to improve displacement efficiency.
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to provide the experimental system of methane gas in a kind of carbon dioxide replacement hydrate, to improve carbon dioxide replacement efficiency.
To achieve these goals, the present invention adopts the technical scheme that:
The pilot system of methane gas in a kind of carbon dioxide replacement hydrate,
Including methane gas cylinder 1, CO 2 high pressure gas cylinder 2, air relief valve 3, air relief valve 3a, reactor 4, needle-valve 5, needle-valve 5a, methane/carbon dioxide membrane separator 6, precooler 7, carbon dioxide delivery pump 8, temperature control system 9, temperature control system 9a, temperature sensor 10, pressure transducer 11, data acquisition board 12, computer 13, vacuum pump 14, electric metering pump 15, distillation water pot 16 and methane collection device 17;
Vacuum pump 14 by the pipeline evacuation of native system, distillation water pot 16 through electric metering pump 15 to the distilled water injecting scheduled volume in reactor 4; Methane gas cylinder 1 injects methane gas through described air relief valve 3 in reactor 4, and pressure closes air relief valve 3 after reaching 8MPa, and temperature control system 9 is opened and lowered the temperature, and makes reactor 4 temperature be maintained at 0 DEG C, and methane hydrate initially forms;After distilled water in reactor 4 is fully converted into methane hydrate, make to be down to-20 DEG C in reactor 4 by temperature control system 9, open needle-valve 5a, remain free methane gas in reactor 4 and enter methane collection device 17, close needle-valve 5a; CO 2 high pressure gas cylinder 2 through air relief valve 3a to after injecting the carbon dioxide of scheduled volume in precooler 7, after pressure in precooler 7 reaches 4MPa, close valve 3a, opening temp. control system 9a lowers the temperature, the temperature making precooler 7 is maintained at 2 DEG C, and carbon dioxide is delivered in reactor 4 through carbon dioxide delivery pump 8; Opening temp. control system 9 heats up, and makes reactor 4 temperature be maintained at 2 DEG C, and now carbon dioxide starts the methane in replacing water compound; Temperature sensor 10 and pressure transducer 11 collect the analogue signal of the temperature and pressure of reactor 4, this analogue signal be transferred to data collecting card 12 carry out data process obtain digital signal, carry out data after the incoming computer 13 of digital signal and show and storage; Methane-carbon dioxide gas mixture after displacement enters methane/carbon dioxide membrane separator 6 through needle-valve 5, the methane gas separated by methane/carbon dioxide membrane separator 6 is entered methane collection device 17 and stores, and carbon dioxide obtained after separating enters precooler 7 for recycling.
Compared with prior art, the beneficial effects of the present invention is:
The present invention adopts and enters carbon dioxide bottom reactor, and top goes out the mode of carbon dioxide recycle, and carbon dioxide and methane hydrate are fully contacted can strengthen the heat transfer of carbon dioxide replacement process, mass transfer, improves displacement efficiency; The carbon dioxide separated after membrane separator, may proceed to participate in follow-up hydrate replacement reaction, and experiment circulation carries out, and not only saves experimental cost, and improves the utilization ratio of experimental system. The recovery method of methane in actual carbon dioxide replacement gas hydrates is played important directive function.
Accompanying drawing explanation
Fig. 1 is the structural representation of the experimental system of methane gas in carbon dioxide replacement hydrate of the present invention.
Each part description in figure: 1-methane gas cylinder, 2-CO 2 high pressure gas cylinder, 3,3a-air relief valve, 4-reactor, 5,5a-needle-valve, 6-methane/carbon dioxide membrane separator, 7-precooler, 8-carbon dioxide delivery pump, 9,9a-temperature control system, 10-temperature sensor, 11-pressure transducer, 12-Agilent data acquisition board, 13-computer, 14-vacuum pump, 15-electric metering pump, 16-distills water pot, 17-methane collection device.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further illustrated.
It is an object of the invention to for carbon dioxide replacement process slowly problem, it is provided that the experimental system of methane gas in a kind of carbon dioxide replacement hydrate. This system enters carbon dioxide by bottom, and top goes out the mode of carbon dioxide recycle, can strengthen the heat transfer of carbon dioxide replacement process, mass transfer, improves displacement efficiency.
The experimental system of methane gas in the carbon dioxide replacement hydrate of the present invention, including air supply system, temperature control system, response system, dynamical system and five parts of data collecting system. Each several part assembly is respectively: air supply system includes gas cylinder 1 and 2, provides the flowing gas of convenient pressure for experimental system. Methane gas is through air relief valve 3, and carbon dioxide, through air relief valve 3a, enters reaction in reactor 4. Temperature control system is mainly constant temperature water box, provides the temperature environment needed for experimental system. Response system is mainly visualization high pressure transparent reaction still 4, be one can the reaction vessel of high pressure resistant 20MPa, dispose temperature sensor 10, pressure transducer 11 in still respectively, with experiment parameters such as Real-time Collection temperature, pressure;There is venthole kettle upper end, communicates with vacuum pump 14 pipeline, for system pipeline evacuation in experiment. Dynamical system is mainly made up of vacuum pump 14, electric metering pump 15 and carbon dioxide delivery pump 8, provides vacuum environment, distilled water and guarantee gas smooth circulation for experimental system. Vacuum pump 14 is on pretreatment by whole pipeline evacuation; Electric metering pump 15 provides distilled water for experimental system; Carbon dioxide delivery pump is connected to reactor 4 in pipeline, moves the power providing necessary in experiment for flow of carbon dioxide gas. In experimentation, the carbon dioxide separated after membrane separator 6, may proceed to participate in follow-up hydrate replacement reaction, experiment circulation carries out, and not only saves experimental cost, and improves the utilization ratio of experimental system. Data collecting system is made up of Agilent data acquisition board 12 and high-performance desktop 13, in an experiment data the record such as Real-time Collection temperature, pressure, processes the data progress with reflection experiment directly perceived.
The experimentation of this experimental system is as follows:
1) cleaning reactor 4 and experiment pipeline with distilled water, treat that its dried empirically system connection diagram connects each device and parts, system is hunted leak, and starting vacuum pump 14 is pipeline evacuation, closes vacuum pump 14 after reaching certain vacuum;
2) experimentation needs be initially formed methane hydrate. Distillation water pot 16 through electric metering pump 15 to the distilled water providing 200g in reactor 4; Then opening gas cylinder 1, inject methane gas through air relief valve 3 in reactor 4, pressure is then shut off valve 3 after reaching 8MPa;
3) opening temp. control system 9, cooling, make reaction kettle body 4 temperature be maintained at 0 DEG C, methane hydrate initially forms;
4) after the distilled water in question response still 4 is fully converted into methane hydrate, make to be down to-20 DEG C in reactor 4 by temperature control system 9, opening needle-valve 5a, remain free methane gas and enter methane collection device 17 in still, free gas is well into closing needle-valve 5a after catcher 17;
5) gas cylinder 2 is opened through air relief valve 3a to after injecting a certain amount of carbon dioxide in precooler, after pressure reaches 4MPa, closing valve 3a;
6) opening temp. control system 9a, cooling, make precooler temperature be maintained at 2 DEG C, carbon dioxide is delivered in reactor 4 through carbon dioxide delivery pump 8;
7) opening temp. control system 9, heats up, makes reactor 4 temperature be maintained at 2 DEG C, and now carbon dioxide starts the methane in replacing water compound;
8) Agilent data collecting card 12 and computer 13 are opened; Temperature sensor 10 and pressure transducer 11 collect the analogue signals such as the temperature and pressure of reactor 4, these signals be transferred to data collecting card 12 carry out data process obtain digital signal, carry out data after the incoming computer 13 of digital signal and show and storage. Each data such as temperature, pressure in real time record experimental system;
9) methane-carbon dioxide gas mixture after displacement enters membrane separator 6 through needle-valve 5, and the methane gas separated by membrane separator 6 is entered methane collection device 17 and stores; And carbon dioxide obtained after separating enters precooler 7 for recycling.
To sum up, air supply system is mainly gas cylinder, provides the flowing gas of convenient pressure for experimental system. Temperature control system is mainly constant temperature water box, provides the temperature environment needed for experimental system. Response system is mainly visualization high pressure transparent reaction still, disposes temperature sensor and pressure transducer in still respectively, and there is venthole kettle upper end, communicates with vacuum pump pipeline.Dynamical system mainly includes vacuum pump, electric metering pump and carbon dioxide delivery pump, provides vacuum environment, distilled water and guarantee gas smooth circulation for experimental system. Data collecting system is made up of Agilent data acquisition board and high-performance desktop, gathers the data such as substantial amounts of temperature and pressure in an experiment and can automatically be recorded and process. The present invention adopts and enters carbon dioxide bottom reactor, and top goes out the mode of carbon dioxide recycle, can strengthen the heat transfer of carbon dioxide replacement process, mass transfer, improves displacement efficiency; The carbon dioxide separated after membrane separator, may proceed to participate in follow-up hydrate replacement reaction, and experiment circulation carries out, and not only saves experimental cost, and improves the utilization ratio of experimental system. The recovery method of methane in actual carbon dioxide replacement gas hydrates is played important directive function.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and this embodiment is also not used to limit the scope of the claims of the present invention, and all equivalences done without departing from the present invention are implemented or change, and are intended to be limited solely by the scope of the claims of this case.
Claims (2)
1. the pilot system of methane gas in a carbon dioxide replacement hydrate, it is characterised in that
Including methane gas cylinder (1), CO 2 high pressure gas cylinder (2), air relief valve (3), air relief valve (3a), reactor (4), needle-valve (5), needle-valve (5a), methane/carbon dioxide membrane separator (6), precooler (7), carbon dioxide delivery pump (8), temperature control system (9), temperature control system (9a), temperature sensor (10), pressure transducer (11), data acquisition board (12), computer (13), vacuum pump (14), electric metering pump (15), distillation water pot (16) and methane collection device (17),
Vacuum pump (14) by the pipeline evacuation of native system, distillation water pot (16) through electric metering pump (15) to the distilled water of injection scheduled volume in reactor (4); Methane gas cylinder (1) injects methane gas through air relief valve (3) in reactor (4), pressure closes air relief valve (3) after reaching 8MPa, temperature control system (9) is opened and is lowered the temperature, making reactor (4) temperature be maintained at 0 DEG C, methane hydrate initially forms; After distilled water in reactor (4) is fully converted into methane hydrate, make to be down to-20 DEG C in reactor (4) by temperature control system (9), open needle-valve (5a), remain free methane gas in reactor (4) and enter methane collection device (17), close needle-valve (5a); CO 2 high pressure gas cylinder (2) through air relief valve (3a) to after injecting the carbon dioxide of scheduled volume in precooler (7), after pressure in precooler (7) reaches 4MPa, close valve 3a, opening temp. control system (9a) is lowered the temperature, the temperature making precooler (7) is maintained at 2 DEG C, and carbon dioxide is delivered in reactor (4) through carbon dioxide delivery pump (8); Opening temp. control system (9) heats up, and makes reactor (4) temperature be maintained at 2 DEG C, and now carbon dioxide starts the methane in replacing water compound; Temperature sensor (10) and pressure transducer (11) collect the analogue signal of the temperature and pressure of reactor (4), this analogue signal be transferred to data collecting card 12 carry out data process obtain digital signal, carry out data after the incoming computer of digital signal (13) and show and storage; Methane-carbon dioxide gas mixture after displacement enters methane/carbon dioxide membrane separator (6) through needle-valve (5), the methane gas separated by methane/carbon dioxide membrane separator (6) is entered methane collection device (17) and stores, and carbon dioxide obtained after separating enters precooler (7) for recycling.
2. the experimental system of methane gas in carbon dioxide replacement hydrate according to claim 1, it is characterised in that predetermined amount of distilled water is the distilled water of 200g.
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| CN201511028919.2A CN105651942A (en) | 2015-12-30 | 2015-12-30 | Experimental system for displacing methane gas in hydrate by carbon dioxide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108760682A (en) * | 2018-05-24 | 2018-11-06 | 中国地质大学（北京） | Gas replacement parameter acquiring method, system and terminal device |
| CN109324125A (en) * | 2018-08-20 | 2019-02-12 | 中山大学 | The experimental system and experimental method of tandem reaction kettle with the underwater methane hydrate of displacement that can fill the water tandem reaction kettle can be filled the water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108760682A (en) * | 2018-05-24 | 2018-11-06 | 中国地质大学（北京） | Gas replacement parameter acquiring method, system and terminal device |
| CN109324125A (en) * | 2018-08-20 | 2019-02-12 | 中山大学 | The experimental system and experimental method of tandem reaction kettle with the underwater methane hydrate of displacement that can fill the water tandem reaction kettle can be filled the water |
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Application publication date: 20160608 |