CN212622573U - Hydrate evaluation experiment system - Google Patents
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- CN212622573U CN212622573U CN202021220067.3U CN202021220067U CN212622573U CN 212622573 U CN212622573 U CN 212622573U CN 202021220067 U CN202021220067 U CN 202021220067U CN 212622573 U CN212622573 U CN 212622573U
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Abstract
The utility model provides a pair of hydrate evaluation experimental system, including first gas cylinder, second gas cylinder, flow control device, flow controller, magnetic stirring container, changeChemical reagent injection device, closed loop and the like, wherein a first gas cylinder is used for storing CH4Or a natural gas mixture; the gas outlet of the first gas cylinder is connected with the magnetic stirring container through a flow controller; the second gas cylinder is used for storing CO2A gas; the gas outlet of the second gas cylinder is connected with the magnetic stirring container through a flow control device; a chemical reagent injection port is arranged on the magnetic stirring container and is connected with an outlet of the chemical reagent injection device; the closed loop is respectively connected with the first gas cylinder, the second gas cylinder and the chemical reagent injection device through a twentieth valve; the utility model discloses can form through realizing simulation hydrate, the while analysis he is convenient for develop further detailed analysis and research to the formation of hydrate and the influence of decomposition law to guide production.
Description
Technical Field
The utility model relates to a hydrate development field, concretely relates to hydrate evaluation experiment system.
Background
The natural gas hydrate is a naturally-existing compound with a cage-shaped microstructure, is an efficient clean energy source with high combustion heat value, and the energy generated by combustion of the natural gas hydrate is tens of times more than that of common fossil fuel with the same mass. The natural gas hydrate is a cage-shaped crystalline compound which is formed by light hydrocarbon gas micromolecules such as methane and the like in natural gas and water molecules under certain temperature and pressure conditions, is similar to loose ice or dense snow in appearance.
With the further research on the method, a plurality of mining methods are proposed, and the main principle is to change the temperature and the pressure of a combustible ice reservoir, break the phase balance of the combustible ice reservoir and decompose the combustible ice to obtain methane gas. During the natural gas exploitation, storage and transportation, natural gas hydrate often causes the blockage of pipelines, valves and equipment, although there are many methods for preventing natural gas hydrate, there are 5 methods for preventing natural gas hydrate embolism in pipelines: dehydration, depressurization, heating, mechanical, chemical.
Research shows that chemical methods are generally the most common and effective methods for injecting chemical agents (such as methanol and the like) into the stratum, and can improve the phase equilibrium condition of hydrate formation, so that the pore pressure and temperature conditions of the stratum cannot meet the phase equilibrium condition of the hydrate, and the hydrate is decomposed and phase-changed to generate methane gas for collection. The chemical method can inhibit the formation of natural gas hydrate and can also dissolve the formed natural gas hydrate.
The existing experimental system for hydrate synthesis and exploitation research has the following defects: (1) the subjects were mainly on natural gas compounds, and rarely on CO2Of a hydrate. (2) There is no study on the properties of hydrate inhibitors and accelerators. And (3) when corresponding gas and liquid are output, the design on the aspect of pressure control is simpler, and particularly, when a pressure reduction decomposition experiment is carried out, the output pressure is not stable enough, and pulses possibly influence the accuracy of metering and the experiment effect. (4) After the combustible ice is formed, the specific distribution conditions of internal temperature and pressure are not accurately measured, the precision is not enough, and inconvenience is brought to experimental research. (5) Some devices also have potential safety hazards or are inconvenient to operate, the experimental process cannot be better controlled, and great inconvenience is brought to the development of experimental research. (6) No gas hydrate plugs and corresponding precautions in the pipeline were investigated.
Disclosure of Invention
An object of the utility model is to provide a hydrate evaluation experimental system has solved the synthesis of current hydrate and the above-mentioned defect that the exploitation research experiment exists.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
the utility model provides a hydrate evaluation experiment system, which comprises a first gas cylinder, a second gas cylinder, a flow control device, a flow controller, a magnetic stirring container, a chemical reagent injection device and a closed loop, wherein,
the first gas cylinder is used for storing CH4Or a natural gas mixture; the gas outlet of the first gas cylinder is connected with the magnetic stirrer through a flow controllerA container;
the second gas cylinder is used for storing CO2A gas; the gas outlet of the second gas cylinder is connected with the magnetic stirring container through a flow control device;
a chemical reagent injection port is arranged on the magnetic stirring container and is connected with an outlet of the chemical reagent injection device;
the closed loop is respectively connected with the first gas cylinder, the second gas cylinder and the chemical reagent injection device through a twentieth valve.
Preferably, the closed loop includes a third pressure gauge, a first thermometer, a window, a twenty-second valve, a differential pressure sensor, a twenty-third valve, a twenty-fourth valve, a twenty-fifth valve, a circulating pump and a twenty-sixth valve, wherein an outlet of the twentieth valve is connected to an inlet of the window, the twenty-second valve and the twenty-fourth valve are respectively connected to an outlet of the window, an outlet of the twentieth valve is combined with outlets of the twenty-fourth valve through the differential pressure sensor and the twenty-third valve in sequence, and then is connected with inlets of the twenty-fifth valve and the circulating pump, an outlet of the circulating pump is combined with an outlet of the twenty-fifth valve through the twenty-sixth valve, and then is connected to an inlet of the window.
Preferably, the outlets of the first gas cylinder and the second gas cylinder are both connected with a high-pressure storage tank through a gas booster pump, and the outlets of the high-pressure storage tank are respectively connected with a flow controller and a flow control device.
Preferably, an air inlet of the gas booster pump is connected with a low-pressure storage tank through a tenth valve, and the low-pressure storage tank is connected with an air compressor.
Preferably, the low-pressure storage tank is also connected with a chemical agent injection device.
Preferably, the flow control device comprises a first liquid pool, a first piston and a second piston, wherein a liquid outlet of the first liquid pool is respectively connected with liquid inlets of the first piston and the second piston through a constant pressure pump; and the gas outlets of the first piston and the second piston are respectively connected with the magnetic stirring container through a seventh valve and an eighth valve.
Preferably, the chemical reagent injection device comprises a second liquid pool, a third piston and a fourth piston, wherein a liquid outlet of the second liquid pool is connected with liquid inlets of the third piston and the fourth piston through a constant flow pump respectively; and the chemical reagent outlets of the third piston and the fourth piston are respectively connected with the twentieth valve through a sixteenth valve and an eighteenth valve.
Preferably, the experimental system further comprises an exhaust device for vacuumizing, wherein the exhaust device comprises a twenty-seventh valve, the twenty-seventh valve is arranged on the closed loop, an outlet of the twenty-seventh valve is respectively connected with the buffer tank and the vacuum pump, and the buffer tank is provided with a fourth pressure gauge and a twenty-eighth valve.
Preferably, the experimental system further comprises a gas-liquid separation structure, the gas-liquid separation structure comprises a gas-liquid separator, and an inlet of the gas-liquid separator is connected with an outlet of the magnetic stirring container through a back pressure valve and a twenty-ninth valve in sequence; a gas outlet of the gas-liquid separator is connected with a wet flowmeter; and a liquid outlet of the gas-liquid separator is connected with a metering container.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a pair of hydrate evaluation experimental system for current experimental facilities of the same kind, the utility model has the advantages of it is following:
(1) the subject can be directed to both natural gas compounds and to CO2Of a hydrate.
(2) The utility model discloses can carry out the research to properties such as the friction drag of hydrate inhibitor and promoter.
(3) When corresponding gas and liquid are output, the pressure is controlled stably without pulse, so that the metering accuracy and the experimental effect are ensured.
(4) When natural gas is transported through a pipeline, hydrate is easily formed, and the pipeline, the valve and equipment are often blocked.
Furthermore, this system design has a back pressure valve, when carrying out the step-down experiment, can stabilize output pressure.
The utility model is suitable for a natural gas hydrate and CO2Relevant experimental tests of the hydrate are described, and relevant experimental operation methods are introduced. The experimental system can be used for simulating the formation of the hydrate, simulating the pressure reduction method, the heating method and the chemical method to exploit the combustible ice, and evaluating the influence of relevant factors such as temperature, pressure, the type and concentration of chemical reagents, reaction time and the like on the exploitation of the combustible ice. Meanwhile, the test system can be used for testing the properties of the hydrate inhibitor sample under different test conditions such as temperature, pressure, flow rate and the like; and meanwhile, the influence of the hydrate on the formation and decomposition rules of the hydrate is analyzed, so that further detailed analysis and research can be conveniently carried out, and the production is guided.
Drawings
Fig. 1 is a schematic structural diagram of an experimental system related to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a hydrate evaluation experiment system, which comprises a first gas cylinder 1, a second gas cylinder 2, a first valve 3, a second valve 4, a gas booster pump 5, a first safety valve 6, a high-pressure storage tank 7, a first pressure gauge 8, a pressure regulating valve 9, a second pressure gauge 10, a third valve 11, a flow controller 12, a fourth valve 13, a fifth valve 14, a first liquid tank 15, a constant-pressure pump 16, a sixth valve 17, a first piston 18, a seventh valve 19, an eighth valve 20, a second piston 21, a ninth valve 22, a back-pressure valve 23, a tenth valve 24, an air compressor 25, a low-pressure storage tank 26, a second safety valve 27, an eleventh valve 28, a twelfth valve 29, a thirteenth valve 30, a cleaning container 31, a fourteenth valve 32, a second liquid tank 33, a constant-flow pump 34, a fifteenth valve 35, a third piston 36, a sixteenth valve 37, a seventeenth valve 38, a fourth piston 39, a seventeenth valve 38, a piston 39, a pressure pump, a seventh, An eighteenth valve 40, a nineteenth valve 41, a twentieth valve 42, a third pressure gauge 43, a first temperature gauge 44, a first camera 45, a window 46, a first cold light source 47, a twenty-first valve 48, a twentieth valve 49, a differential pressure sensor 50, a twentieth valve 51, a twenty-fourth valve 52, a third safety valve 53, a twenty-fifth valve 54, a circulation pump 55, a twenty-sixth valve 56, a vacuum pump 57, a buffer tank 58, a fourth pressure gauge 59, a twenty-seventh valve 60, a twenty-eighth valve 61, a thirty-second valve 62, a magnetic stirring vessel 63, a high and low temperature bath 64, a second cold light source 65, a second camera 66, a second temperature gauge 67, a twenty-ninth valve 68, a thirty-third valve 69, a back pressure valve 70, a back pressure vessel 71, a back pressure pump 72, a fifth pressure gauge 73, a wet flow meter 74, a gas-liquid separator 75, a thirty-first valve 77 and a metering vessel 78, wherein gas inlets of the first gas cylinder 1 and the second gas cylinder 2 are connected to a booster pump of, the gas outlet of the gas booster pump 5 is respectively connected with the high-pressure storage tank 7 and the low-pressure storage tank 26.
A first valve 3 is arranged between the first gas bottle 1 and the gas booster pump 5.
A second valve 4 is arranged between the second gas bottle 2 and the gas booster pump 5.
A tenth valve 24 is provided between the gas booster pump 5 and the low-pressure tank 26, and the gas booster pump 5 is powered through the tenth valve 24.
The high-pressure storage tank 7 is provided with a first safety valve 6 and a first pressure gauge 8.
The high-pressure tank 7 passes through the pressure regulating valve 9, the fifth valve 14, and the back pressure valve 23 in this order.
A second pressure gauge 10 is arranged between the pressure regulating valve 9 and the fifth valve 14.
A flow controller 12 is arranged between the air inlet of the fifth valve 14 and the air inlet of the backpressure valve 23, a third valve 11 is arranged at the inlet of the flow controller 12, and a fourth valve 13 is arranged at the air outlet of the flow controller 12.
A seventh valve 19 and a ninth valve 22 are sequentially arranged at the air outlet of the fifth valve 14, wherein the outlet of the seventh valve 19 is sequentially connected with the first piston 18 and the sixth valve 17; the outlet of the ninth valve 22 is connected to the second piston 21 and the eighth valve 20 in sequence.
The outlets of the sixth valve 17 and the eighth valve 20 are both connected with a constant pressure pump 16, and the constant pressure pump 16 is connected with a first liquid pool 15.
The outlet of the back pressure valve 23 is connected to the inlet of the magnetic stirring vessel 63 via a thirtieth valve 62.
The magnetic stirring container 63 is arranged in a high-low temperature bath 64, and a second cold light source 65 and a second camera 66 are arranged on the high-low temperature bath 64.
The outlet of the magnetic stirring container 63 is connected with a back pressure valve 70 through a second thermometer 67, a twenty-ninth valve 68 and a thirty-third valve 69 in sequence.
The outlet of the back pressure valve 70 is connected to a back pressure vessel 71 and a gas-liquid separator 75, respectively.
The gas-liquid separator 75 is provided with a wet flowmeter 74 at a gas outlet.
The liquid outlet of the gas-liquid separator 75 is connected to a metering vessel 77 via a low thirty-one valve 76.
An air inlet provided on the low-pressure storage tank 26 is connected with an air compressor 25.
The low-pressure tank 26 is provided with a second relief valve 27 and an eleventh valve 28.
The gas outlet of the low-pressure storage tank 26 is respectively connected with a tenth valve 29 and a thirteenth valve 30, wherein the outlet of the thirteenth valve 30 is sequentially connected with a cleaning container 31 and a fourteenth valve 32; the outlets of the fourteenth valve 32 and the twelfth valve 29 are both connected to the inlet of the nineteenth valve 41. The cleaning liquid in the cleaning vessel 31 is pressed into the following piping system by the gas pressure in the low-pressure tank 26 while the piping solid particles are displaced by the gas.
A sixteenth valve 37 and an eighteenth valve 40 are arranged at an inlet of the nineteenth valve 41, wherein an outlet of the sixteenth valve 37 is connected with the third piston 36 and the fifteenth valve 35 in sequence; the outlet of the eighteenth valve 40 is sequentially connected with a fourth piston 40 and a seventeenth valve 38; the outlets of the fifteenth valve 35 and the seventeenth valve 35 are connected to a constant flow pump 34, and the outlet of the constant flow pump 34 is connected to the second liquid pool 33.
The outlet of the nineteenth valve 41 is connected to the inlet of the twentieth valve 42,
the outlet of the twentieth valve 42 is connected with a closed loop, the closed loop comprises a window 46, a twenty-second valve 49, a differential pressure sensor 50, a twenty-third valve 51, a twenty-fourth valve 52, a twenty-fifth valve 54, a circulating pump 55, a twenty-sixth valve 56 and a thirty-third valve 69, the outlet of the chemical reagent injection device is connected with the inlet of the window 46, the outlet of the window 46 is respectively connected with the twenty-second valve 49 and the twenty-fourth valve 52, the outlet of the twenty-second valve 49 is combined with the outlet of the twenty-fourth valve 52 through the differential pressure sensor 50 and the twenty-third valve 51 in sequence and then is respectively connected with the inlets of the twenty-fifth valve 54 and the circulating pump 55, and the outlet of the circulating pump 55 is combined with the outlet of the twenty-fifth valve 54 through the twenty-sixth valve 56 and then is connected with the inlet.
A third pressure gauge 43 and a first temperature gauge 44 are sequentially arranged between the outlet of the twentieth valve 42 and the window 46.
A first camera 45 and a first cold light source 47 are arranged on the window 46; the first cold light source 47 can emit light to illuminate the window 46, so that the first camera 45 can conveniently shoot internal experiment phenomena.
And a twenty-first valve 48 is also arranged on the closed loop and is used for emptying when the experiment pipeline is cleaned, and removing residual liquid and the like.
A third relief valve 53 is designed between the twenty-fourth valve 52 and the twenty-fifth valve 54.
The closed loop is connected with the back pressure valve 70 through a thirtieth valve 69.
And an exhaust device for vacuumizing is further arranged on the closed loop, the exhaust device comprises a twenty-seventh valve 60, an outlet of the twenty-seventh valve 60 is respectively connected with a buffer tank 58 and a vacuum pump 57, and a fourth pressure gauge 59 and a twenty-eighth valve 61 are arranged on the buffer tank 58.
The magnetic stirring container 63 and the high-low temperature bath 64 are both made of transparent materials.
The second cold light source 65 and the second camera 66 are arranged on the outer side of the high-low temperature bath groove 64, and the second cold light source 65 can emit light to irradiate the interior of the high-low temperature bath groove 64, so that the second camera 66 can shoot internal experimental phenomena conveniently.
Sufficient CH for the internal reservoir of the first cylinder 14Or a natural gas mixture; sufficient CO in the inner reservoir of the second gas cylinder 22A gas.
The pressure regulating valve 9 can regulate the pressure of output gas; the flow controller 12 can regulate the flow of the output gas, and this branch is selected when outputting natural gas.
The first liquid pool 15 and the second liquid pool 33 are filled with enough clear water.
When CO is output from the second gas cylinder 22When in gas, clean water is conveyed at constant pressure through the constant pressure pump 16 to replace CO sucked by the first piston 18 and the second piston 212The gas is output through a back pressure valve 23.
The cleaning vessel 31 can be opened for storage of fresh water or cleaning agents for synthesis of hydrates or cleaning of plant lines. The tops of the third piston 36 and the fourth piston 39 are used for storing chemical reagent experiment samples.
The magnetic stirring vessel 63 can be adjusted in rotation speed, and the wet flowmeter 74 can measure the mass of the gas flowing through. The gas-liquid separator 75 can separate gas-liquid fluid flowing therethrough. The metering container 77 can meter the weight of the liquid separated inside.
All connecting pipelines of the system adopt 316L pipelines to prevent corrosion of internal fluid to the pipelines, and the pipelines are wrapped by insulating materials in a winding mode to prevent local temperature reduction, so that secondary generation of hydrate or generation of ice can be caused, pipelines are blocked, the effect of experiment development is influenced, and potential safety hazards are caused to the experiment. The parameters such as the discharge capacity, the temperature and the pressure can be used for acquiring data through the data acquisition control card and carrying out real-time monitoring and data acquisition on the flow, the temperature and the pressure in the experiment system.
The chemical reagent comprises a hydrate inhibitor or a hydrate accelerant.
The test method specifically comprises the following steps:
(1) as shown, the equipment is cleaned, the air tightness of the system is checked, relevant valves are adjusted,
(2) the vacuum pump 57 is then turned on to evacuate the test system and the air inside the pipeline, thereby evacuating the air that interferes with the test and is ready for the test.
(3) Supercharging: turning on the air compressor provides sufficient power for the gas booster pump 5.
(4) The experiment was started: the experiment was started in four cases A, B, C, D
A. Synthesis of hydrate without chemical reagent
The twentieth valve 42 and the twenty-ninth valve 68 are closed.
Synthesizing combustible ice:
the first valve 3, the third valve 11 and the fourth valve 13 are opened, the fifth valve 14 is closed, and CH to be stored in the first gas cylinder 1 is stored4Or the natural gas mixture is pressurized by the gas booster pump 5, then is sent into the high-pressure storage tank 7 to be stored, collects the pressure of the high-pressure storage tank 7 through the first pressure gauge 8, and is released through the first safety valve 6 to ensure safety.
The high-pressure gas in the high-pressure storage tank 7 is regulated by a pressure regulating valve 9, the pressure of the high-pressure gas is measured by a second pressure gauge 10, the high-pressure gas is sent to a back pressure valve 23 through a third valve 11, a flow controller 12 and a fourth valve 13 to be regulated, and then the high-pressure gas is sent to a magnetic stirring container 63, and experimental technological parameters are set according to experimental technological requirements to synthesize combustible ice.
Separation of mixed gas:
the mixed gas passes through a magnetic stirring container 63, experimental technological parameters are set according to experimental technological requirements, and hydrate is synthesized; the remaining gas passes through a gas-liquid separator 75.
And is used to meter the mass of the gas separated by the gas-liquid separator 75 by means of a wet flow meter 74.
The mass of separated liquid is metered by means of a metering container 77.
Synthesis of CO2Hydrate:
the second valve 4, the fifth valve 14, the sixth valve 17, the seventh valve 19, the eighth valve 20, and the ninth valve 22 are opened, the third valve 11 and the fourth valve 1 are closed, and CO to be stored in the second gas cylinder 2 is stored2Gas is pressurized through the gas booster pump 5, then is sent into the high-pressure storage tank 7 and is stored, and the pressure of the high-pressure storage tank 7 is collected through the first pressure gauge 8, and is released through the first safety valve 6 to ensure safety.
The high-pressure gas in the high-pressure storage tank 7 is regulated by a pressure regulating valve 9, the pressure of the high-pressure gas is measured by a second pressure gauge 10, then the high-pressure gas is sent to a fifth valve 14, a constant pressure pump 16 is opened, and clean water in a first liquid pool 15 is sent to a first piston 18 and a second pistonTwo pistons 21 for metering CO2Gas while ensuring CO2Quantitative injection of special phase gas; then the mixture is sent to a back pressure valve 23 for pressure regulation, and then sent into a magnetic stirring container 63, experimental technological parameters are set according to experimental technological requirements, and CO is carried out2And (4) synthesizing a hydrate. And finally testing the separation effect under different experimental conditions by using a gas-liquid separation structure.
B. When a chemical reagent is used for synthesizing the hydrate, synthesizing combustible ice:
will CH4Feeding into a magnetic stirring container 63; meanwhile, injecting a chemical reagent into the magnetic stirring container 63 by using a chemical reagent injection device, setting experimental technological parameters according to experimental technological requirements, and synthesizing combustible ice; and finally testing the separation effect under different experimental conditions by using a gas-liquid separation structure.
Synthesis of CO2Hydrate:
introducing CO2Feeding into a magnetic stirring container 63; meanwhile, a chemical reagent injection device is used for injecting the chemical reagent into the magnetic stirring container 63, experimental technological parameters are set according to experimental technological requirements, and CO is carried out2And (4) synthesizing a hydrate.
Use of chemical injection device: the second constant pressure pump 34 is turned on, and the clean water in the second liquid pool 33 is injected into the third piston 36 and the fourth piston 39, and the chemical reagent stored at the top of the pistons is injected into the magnetic stirring container 63 through the pistons.
And finally testing the separation effect under different experimental conditions by using a gas-liquid separation structure.
C. The chemical reagents were tested:
injecting the chemical agent into the window 46 by the chemical agent injection means, closing the twentieth valve 42, the twenty-fifth valve 54, and the thirtieth valve 69; opening the twentieth valve 49, the twentieth valve 51 and the twenty-fourth valve 52, setting the flow rate of the liquid, starting the circulating pump 55, enabling the chemical reagent to flow in a closed loop formed by the window 46, the twenty-fourth valve 52, the circulating pump 55 and the window 46 for experimental evaluation of the thermodynamic chemical reagent, the kinetic chemical reagent, the polymerization inhibitor or the composite chemical reagent; at the same time, the pressure difference at the inlet and outlet of the twenty-fourth valve 52 is collected by the pressure difference sensor 50.
D. Observing synthesis or decomposition of hydrates
Introducing CO2Gas or CH4Sent into the closed loop through a twentieth valve 42, and the experimental temperature is set by a temperature control device arranged on the closed loop so as to simulate CO2Gas or CH4In the pipeline transportation process, hydrates are formed due to temperature reduction, and when the temperature is raised, whether hydrate plungers are formed in the valve and the narrow and long pipeline or not is judged; it can also be used to simulate the chemical removal of hydrate plugs in the recycle line. And finally, the gas-liquid mixture passes through a thirtieth valve 69 and a gas-liquid separation structure to test the separation effect under different experimental conditions.
Claims (9)
1. A hydrate evaluation experiment system is characterized by comprising a first gas cylinder (1), a second gas cylinder (2), a flow control device, a flow controller (12), a magnetic stirring container (63), a chemical reagent injection device and a closed loop, wherein,
the first gas cylinder (1) is used for storing CH4Or a natural gas mixture; the gas outlet of the first gas bottle (1) is connected with a magnetic stirring container (63) through a flow controller (12);
the second gas cylinder (2) is used for storing CO2A gas; the gas outlet of the second gas bottle (2) is connected with a magnetic stirring container (63) through a flow control device;
a chemical reagent injection port is arranged on the magnetic stirring container (63) and is connected with an outlet of a chemical reagent injection device;
the closed loop is respectively connected with the first gas cylinder (1), the second gas cylinder (2) and the chemical reagent injection device through a twentieth valve (42).
2. A hydrate evaluation experiment system according to claim 1, wherein the closed loop comprises a third pressure gauge (43), a first temperature gauge (44), a window (46), a second valve (49), a differential pressure sensor (50), a twenty-third valve (51), a twenty-fourth valve (52), a twenty-fifth valve (54), a circulation pump (55) and a twenty-sixth valve (56), wherein an outlet of the twentieth valve (42) is connected with an inlet of the window (46), outlets of the window (46) are respectively connected with the twenty-second valve (49) and the twenty-fourth valve (52), an outlet of the twentieth valve (49) is combined with an outlet of the twenty-fourth valve (52) through the differential pressure sensor (50) and the twenty-third valve (51) in sequence and then is connected with inlets of the twenty-fifth valve (54) and the circulation pump (55), and an outlet of the circulation pump (55) is connected with an outlet of the twenty-fifth valve (54) through the twenty-sixth valve (56) Merge and then connect the entrances of the viewing windows (46).
3. The hydrate evaluation experiment system according to claim 1, wherein the outlets of the first gas cylinder (1) and the second gas cylinder (2) are connected with a high-pressure storage tank (7) through a gas booster pump (5), and the outlets of the high-pressure storage tank (7) are respectively connected with a flow controller (12) and a flow control device.
4. A hydrate evaluation experiment system according to claim 3, wherein the gas inlet of the gas booster pump is connected with a low-pressure storage tank (26) through a tenth valve (24), and the low-pressure storage tank (26) is connected with an air compressor (25).
5. A hydrate evaluation experiment system according to claim 4, wherein the low-pressure storage tank (26) is further connected with a chemical agent injection device.
6. A hydrate evaluation experiment system according to claim 1, wherein the flow control device comprises a first liquid pool (15), a first piston (18) and a second piston (21), wherein the liquid outlet of the first liquid pool (15) is connected with the liquid inlets of the first piston (18) and the second piston (21) through a constant pressure pump (16); the gas outlets of the first piston (18) and the second piston (21) are respectively connected with a magnetic stirring container (63) through a seventh valve (19) and a ninth valve (22) via a backpressure valve (23).
7. The hydrate evaluation experiment system according to claim 1, wherein the chemical reagent injection device comprises a second liquid pool (33), a third piston (36) and a fourth piston (39), wherein a liquid outlet of the second liquid pool (33) is connected with liquid inlets of the third piston (36) and the fourth piston (39) through a constant flow pump (34); and chemical agent outlets of the third piston (36) and the fourth piston (39) are respectively connected with a twentieth valve (42) through a sixteenth valve (37) and an eighteenth valve (40) and a nineteenth valve (41).
8. The hydrate evaluation experiment system according to claim 1, further comprising an exhaust device for vacuumizing, wherein the exhaust device comprises a twenty-seventh valve (60), the twenty-seventh valve (60) is arranged on a closed loop, an outlet of the twenty-seventh valve (60) is respectively connected with a buffer tank (58) and a vacuum pump (57), and a fourth pressure gauge (59) and a twenty-eighth valve (61) are arranged on the buffer tank (58).
9. The hydrate evaluation experiment system as claimed in claim 1, further comprising a gas-liquid separation structure, wherein the gas-liquid separation structure comprises a gas-liquid separator (75), and an inlet of the gas-liquid separator (75) is connected with an outlet of the magnetic stirring container (63) through a back-pressure valve (70) and a twenty-ninth valve (68) in sequence; a gas outlet of the gas-liquid separator (75) is connected with a wet flowmeter (74); the liquid outlet of the gas-liquid separator (75) is connected with a metering container (77).
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| CN111650354A (en) * | 2020-06-28 | 2020-09-11 | 中国华能集团有限公司 | Hydrate evaluation experiment system and method |
| CN111650354B (en) * | 2020-06-28 | 2023-11-03 | 中国华能集团有限公司 | Hydrate evaluation experiment system and method |
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