CN112535998A - Gas hydrate preparation system - Google Patents
Gas hydrate preparation system Download PDFInfo
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- CN112535998A CN112535998A CN202010662748.3A CN202010662748A CN112535998A CN 112535998 A CN112535998 A CN 112535998A CN 202010662748 A CN202010662748 A CN 202010662748A CN 112535998 A CN112535998 A CN 112535998A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/006—Processes utilising sub-atmospheric pressure; Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/002—Component parts of these vessels not mentioned in B01J3/004, B01J3/006, B01J3/02 - B01J3/08; Measures taken in conjunction with the process to be carried out, e.g. safety measures
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/108—Production of gas hydrates
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Abstract
The invention relates to the field of gas hydrate preparation, and discloses a gas hydrate preparation system which comprises a reaction kettle, a hydrate collecting kettle and a liquid recycling kettle, wherein the reaction kettle provides a place for gas hydrate generated by the reaction of gas and liquid, a feed inlet of the hydrate collecting kettle is communicated with a solid-liquid outlet of the reaction kettle to be used for collecting residual liquid in the reaction kettle and generated gas hydrate, a liquid inlet of the liquid recycling kettle is communicated with a discharge outlet of the hydrate collecting kettle to be used for recycling liquid in the hydrate collecting kettle, and a liquid outlet of the liquid recycling kettle is communicated with a liquid inlet of the reaction kettle to be used for inputting the recycled liquid into the reaction kettle. By adopting the scheme, the residual liquid in the reaction kettle and the generated gas hydrate can enter the hydrate collecting kettle, the residual liquid entering the hydrate collecting kettle can further enter the liquid recovery kettle, and the residual liquid is input into the reaction kettle from the liquid recovery kettle, so that the collection of the gas hydrate and the reutilization of the residual liquid are realized.
Description
Technical Field
The invention relates to the field of gas hydrate preparation, in particular to a gas hydrate preparation system.
Background
The gas hydrate is formed by gas molecules (CH)4、C2H6、CO2Etc.) react with water molecules under low temperature and high pressure conditions to form non-stoichiometric crystalline cage-like substances. The solid-state storage of the gas can be realized by enabling the gas to form a hydrate form, particularly to the current hotter natural gas which is a low-carbon clean energy source and is 1m3The natural gas hydrate can be stored for 160-180m3Natural gas, which is of great significance for storage and transportation of natural gas.
Compared with the traditional Compressed Natural Gas (CNG) and Liquefied Natural Gas (LNG) gas storage technologies, the gas hydrate gas storage technology has the following advantages: (1) the gas hydrate is solid, can be stored under normal pressure when being frozen to about-15 ℃, has mild storage and transportation conditions, and can realize normal-pressure transportation; (2) the solid state can be kept to exist stably for a long time, pressure surge is not easy to occur, and the safety is high; (3) the gas hydrate takes water as a medium, has no special requirements on the components of natural gas, has low cost and has great economic value. Therefore, the natural gas storage and transportation by the gas hydrate method has a high application prospect.
However, in the currently used gas hydrate preparation device, gas and liquid usually do not completely react, after the reaction is completed, the reaction kettle contains the generated gas hydrate and unreacted gas and liquid, the presence of the liquid increases the difficulty of collecting the gas hydrate, and the unreacted liquid cannot be reused, thereby causing the waste of raw materials. Therefore, there is a need for a gas hydrate production system that facilitates collection of gas hydrates and allows reuse of unreacted liquid.
Disclosure of Invention
It is an object of the present invention to provide a gas hydrate production system to solve the above problems.
In order to achieve the above purpose, the present invention provides a gas hydrate preparation system, which includes a reaction kettle, a hydrate collection kettle and a liquid recovery kettle, wherein the reaction kettle provides a place for gas hydrate generated by gas and liquid reaction, a feed inlet of the hydrate collection kettle is communicated with a solid-liquid outlet of the reaction kettle for collecting residual liquid and generated gas hydrate in the reaction kettle, a liquid inlet of the liquid recovery kettle is communicated with a discharge outlet of the hydrate collection kettle for recovering liquid in the hydrate collection kettle, and a liquid outlet of the liquid recovery kettle is communicated with a liquid inlet of the reaction kettle for inputting recovered liquid into the reaction kettle.
Optionally, the reaction kettle is provided with a gas outlet, and the gas hydrate preparation system comprises a vacuum pumping device communicated with the gas outlet; and/or
The hydrate collecting kettle is internally limited with a collecting cavity, the hydrate collecting kettle is communicated with the feed inlet and the discharge outlet, a first piston is arranged in the hydrate collecting kettle, and the first piston is arranged to be capable of controlling the pressure in the collecting cavity through movement and pressing the liquid in the collecting cavity into the liquid recovery kettle.
Optionally, a liquid storage cavity is defined in the liquid recovery kettle, the liquid inlet and the liquid outlet of the liquid recovery kettle are communicated with the liquid storage cavity, a second piston is arranged in the liquid recovery kettle, and the second piston is arranged to press liquid in the liquid storage cavity into the reaction kettle through movement; and/or
The hydrate collecting kettle is characterized in that a filtering device is arranged at the discharge port, and the filtering device is arranged to prevent the gas hydrate in the collecting cavity from being discharged from the discharge port.
Optionally, the reaction kettle has a gas inlet, the gas hydrate preparation system includes a gas cylinder communicated with the gas inlet and a pressure control device disposed on a communication pipeline between the gas cylinder and the gas inlet, the pressure control device is configured to control a pressure of the gas entering the reaction kettle; and/or
The gas hydrate preparation system includes a controller configured to control operation of the evacuation device.
Optionally, the pressure control device includes a pressure control kettle, the pressure control kettle includes a gas storage cavity limited inside, and a gas inlet and a gas outlet communicated with the gas storage cavity, the gas inlet of the pressure control kettle is communicated with the gas outlet of the gas cylinder, the gas outlet of the pressure control kettle is communicated with the gas inlet of the reaction kettle, a third piston is arranged in the pressure control kettle, and the third piston is set to be capable of controlling the pressure of the gas storage cavity through movement.
Optionally, the gas hydrate production system comprises a pressure controlled pump arranged to be able to drive the movement of the first, second and third pistons respectively; and/or
The gas hydrate preparation system comprises a constant temperature box, and the reaction kettle, the hydrate collection kettle, the liquid recovery kettle and the pressure control kettle are all arranged in the constant temperature box.
Optionally, the controller is arranged to be able to control operation of the pressure controlled pump; and/or
The gas hydrate preparation system comprises a pressure monitor and a temperature monitor, wherein the pressure monitor is used for monitoring the pressure in the pressure control kettle and the pressure in the reaction kettle respectively, and the temperature monitor is used for monitoring the temperature in the reaction kettle.
Optionally, the controller is electrically connected to the pressure monitor and the temperature monitor respectively for receiving data collected by the pressure monitor and the temperature monitor.
Optionally, a stirrer is arranged in the reaction kettle, the stirrer is arranged to move up and down in the reaction kettle to realize stirring, and the gas hydrate preparation system comprises a driving piece for driving the stirrer to move up and down.
Optionally, the reaction kettle is columnar, a cylindrical cavity is defined in the reaction kettle, the stirrer is a stirring magnetic ring coaxial with the reaction kettle, and the driving part comprises a plurality of magnets arranged outside the reaction kettle along the circumferential direction of the stirring magnetic ring and a driving motor for driving the magnets to move up and down along the axial direction of the reaction kettle.
By adopting the technical scheme, after the gas-liquid reaction in the reaction kettle is finished, the residual liquid in the reaction kettle and the generated gas hydrate can be collected into the hydrate collection kettle, the residual liquid entering the hydrate collection kettle can further enter the liquid recovery kettle, and the residual liquid is input into the reaction kettle from the liquid recovery kettle, so that the collection of the gas hydrate and the reutilization of the residual liquid are realized.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of one embodiment of a gas hydrate production system in accordance with the present invention.
Description of the reference numerals
1-gas cylinder, 2-stop valve, 3-pressure monitor, 4-stop valve, 5-pressure control kettle, 6-third piston, 7-stop valve, 8-pressure control pump, 9-stop valve, 10-stop valve, 11-temperature monitor, 12-stop valve, 13-joint, 14-stop valve, 15-first piston, 16-hydrate collection kettle, 17-pressure monitor, 18-three-way valve, 19-nut, 20-screw, 21-reaction kettle, 22-stirring magnetic ring, 23-magnet, 24-stop valve, 25-joint, 26-stop valve, 27-filter screen, 28-stop valve, 29-stop valve, 30-stop valve, 31-fixing plate, 32-second piston, 33-liquid recovery kettle, 34-stop valve, 35-vacuum pump, 36-thermostat, 37-driving motor, 38-controller.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless otherwise specified, the terms of orientation such as "upper, lower, top, and bottom" are generally used to refer to the orientation in the mounted and used state. "inner and outer" refer to the inner and outer contours of the respective component itself.
The invention provides a gas hydrate preparation system which comprises a reaction kettle 21, a hydrate collecting kettle 16 and a liquid recovery kettle 33, wherein the reaction kettle 21 provides a place for gas hydrate generated by gas and liquid reaction, a feed inlet of the hydrate collecting kettle 16 is communicated with a solid-liquid outlet of the reaction kettle 21 to be used for collecting residual liquid in the reaction kettle 21 and generated gas hydrate, a liquid inlet of the liquid recovery kettle 33 is communicated with a discharge outlet of the hydrate collecting kettle 16 to be used for recovering liquid in the hydrate collecting kettle 16, and a liquid outlet of the liquid recovery kettle 33 is communicated with a liquid inlet of the reaction kettle 21 to be used for inputting the recovered liquid into the reaction kettle 21.
By adopting the technical scheme, after the gas-liquid reaction in the reaction kettle 21 is finished, the residual liquid in the reaction kettle 21 and the generated gas hydrate can be collected and enter the hydrate collecting kettle 16, the residual liquid entering the hydrate collecting kettle 16 can further enter the liquid recovery kettle 33, and the residual liquid is input into the reaction kettle 21 through the liquid recovery kettle 33, so that the collection of the gas hydrate and the reutilization of the residual liquid are realized.
As shown in fig. 1, the solid-liquid outlet and the liquid inlet of the reaction kettle 21 may be located at the bottom of the reaction kettle 21, the feed inlet and the discharge outlet of the hydrate collecting kettle 16 may be located at the top of the hydrate collecting kettle 16, and the liquid inlet and the liquid outlet of the liquid recovering kettle 33 may be located at the top of the liquid recovering kettle 33. A communication pipeline between the solid-liquid outlet of the reaction kettle 21 and the feed inlet of the hydrate collection kettle 16 may be provided with a stop valve (such as the stop valves 12 and 14 shown in fig. 1), and after the reaction in the reaction kettle 21 is completed, by opening the stop valves 12 and 14, the residual liquid in the reaction kettle 21 and the generated gas hydrate may enter the hydrate collection kettle 16 through the solid-liquid outlet of the reaction kettle 21 and the feed inlet of the hydrate collection kettle 16. In addition, stop valves (such as stop valves 26, 29, 30, and 24 shown in fig. 1) may be respectively disposed on a communication pipeline between the discharge port of the hydrate collection tank 16 and the liquid inlet of the liquid recovery tank 33 and a communication pipeline between the liquid outlet of the liquid recovery tank 33 and the liquid inlet of the reaction tank 21 to control connection and disconnection of the communication pipelines.
In addition, as shown in fig. 1, the joints 13 and 25 may be respectively disposed on the communication pipeline between the hydrate collection kettle 16 and the reaction kettle 21 and the communication pipeline between the hydrate collection kettle 16 and the liquid recovery kettle 33, and the two communication pipelines may be disconnected at the joint 13 and the joint 25 respectively (which is also the reason why the stop valves are disposed on both sides of the joint of the communication pipelines), so as to achieve the detachability of the hydrate collection kettle 16, and facilitate the utilization of the gas hydrate in the hydrate collection kettle 16. Of these, the couplings 13 and 25 are preferably quick couplings so that quick replacement of the hydrate collection tank 16 can be achieved.
In the present invention, in order to enable the residual liquid collected by the hydrate collection kettle 16 to enter the liquid recovery kettle 33, according to an embodiment of the present invention, a collection cavity is defined in the hydrate collection kettle 16, the feed inlet and the discharge outlet of the hydrate collection kettle 16 are communicated with the collection cavity, a first piston 15 is arranged in the hydrate collection kettle 16, and the first piston 15 is configured to be capable of controlling the pressure in the collection cavity through movement and pressing the liquid in the collection cavity into the liquid recovery kettle 33. Specifically, as shown in fig. 1, the hydrate collection kettle 16 is a cavity, the first piston 15 is disposed in the cavity and divides the cavity into an upper chamber and a lower chamber, the upper chamber is formed as the collection chamber, the volume of the collection chamber is gradually reduced and the pressure is gradually increased by moving the first piston 15 upward, the gas hydrate can be kept stable under a high pressure state, and the liquid is discharged into the liquid recovery kettle 33 through the discharge port of the hydrate collection kettle 16.
In order to prevent the gas hydrate from being discharged from the discharge port of the hydrate collecting kettle 16, a filtering device may be disposed at the discharge port of the hydrate collecting kettle 16, and the filtering device is configured to prevent the gas hydrate in the collecting cavity from being discharged from the discharge port. Wherein the filtering device can be a screen 27 covering the discharge port, and the screen 27 allows liquid to pass through but prevents gas hydrate from passing through.
In the present invention, in order to enable the liquid in the liquid recovery kettle 33 to enter the reaction kettle 21, according to an embodiment of the present invention, a liquid storage cavity is defined in the liquid recovery kettle 33, the liquid inlet and the liquid outlet of the liquid recovery kettle 33 are communicated with the liquid storage cavity, a second piston 32 is disposed in the liquid recovery kettle 33, and the second piston 32 is configured to be capable of pressing the liquid in the liquid storage cavity into the reaction kettle 21 by moving. Specifically, as shown in fig. 1, a cavity is formed in the liquid recovery kettle 33, the second piston 32 is disposed in the cavity and divides the cavity into an upper chamber and a lower chamber, the upper chamber is formed as the liquid storage chamber, and by moving the second piston 32 upward, the volume of the liquid storage chamber is gradually reduced and the pressure is gradually increased, so that the liquid can be pressed into the reaction kettle 21.
In the present invention, the reaction kettle 21 further has a gas inlet, the gas hydrate preparation system may include a gas cylinder 1 communicated with the gas inlet, and a pressure control device disposed on a communication pipeline between the gas cylinder 1 and the gas inlet, the pressure control device being configured to control a pressure of the gas entering the reaction kettle 21. Wherein, as shown in FIG. 1, the gas inlet is preferably located at the top of the reaction vessel 21 (see the connection of the top of the reaction vessel 21 and the stop valve 10 in FIG. 1).
According to one embodiment of the pressure control device in the present invention, the pressure control device includes a pressure control kettle 5, the pressure control kettle 5 includes a gas storage cavity defined therein, and a gas inlet and a gas outlet communicated with the gas storage cavity, the gas inlet of the pressure control kettle 5 is communicated with the gas outlet of the gas cylinder 1, the gas outlet of the pressure control kettle 5 is communicated with the gas inlet of the reaction kettle 21, a third piston 6 is disposed in the pressure control kettle 5, and the third piston 6 is configured to be capable of controlling the pressure of the gas storage cavity by movement. Specifically, as shown in fig. 1, a cavity is formed in the pressure control kettle 5, the third piston 6 is disposed in the cavity and divides the cavity into an upper chamber and a lower chamber, the upper chamber is formed as the gas storage chamber, and the volume of the gas storage chamber is gradually reduced and the pressure is gradually increased by moving the third piston 6 upward. When the gas storage device is used, gas in the gas cylinder 1 firstly enters a gas storage cavity of the pressure control kettle 5, the third piston 6 is moved to enable the pressure of the gas storage cavity to reach a preset pressure (the preset pressure refers to the reaction pressure of gas-liquid reaction in the reaction kettle 21, and the reaction pressure can be 0-30MPa), and then the gas in the gas storage cavity is introduced into the reaction kettle 21, that is, the pressure control kettle 5 regulates the gas from the gas cylinder 1 to the preset pressure and then introduces the gas into the reaction kettle 21. Of course, it is also possible to make the gas in the gas cylinder 1 enter the gas storage chamber of the pressure control kettle 5 and the reaction kettle 21 at the same time, and then make the pressure in the gas storage chamber and the reaction kettle 21 reach the predetermined pressure by moving the third piston 6.
In the present invention, the gas hydrate production system may further include a pressure control pump 8, and the pressure control pump 8 may be configured to drive the first piston 15, the second piston 32, and the third piston 6 to move, respectively. The pressure control pump 8 may be an electric pump having three control cylinders, which are respectively connected to the first piston 15, the second piston 32, and the third piston 6 (see fig. 1), and the pistons may be controllably driven by setting their own stroke, so that the pistons move by a predetermined distance, that is, the control cylinders push the pistons to move by their own stroke changes. Wherein the gas consumption during the generation of the gas hydrate can be calculated by the stroke change of the control cylinder connected with the third piston 6. In the above embodiment, one drive controller is used to drive and control the movement of the first piston 15, the second piston 32, and the third piston 6, but in another embodiment of the present invention, three independent drive control members may be provided to drive and control the movement of the first piston 15, the second piston 32, and the third piston 6, respectively.
In the present invention, the reaction vessel 21 may have a gas outlet (see the junction of the top of the reaction vessel 21 and the three-way valve 18 in fig. 1), and the gas hydrate preparation system may include a vacuum pumping device in communication with the gas outlet. Through setting up evacuating device, evacuating device can carry out the edulcoration of bleeding to reation kettle 21 before the reaction, guarantees going on smoothly of gas hydrate formation reaction. In addition, because the pressure control kettle 5 is communicated with the reaction kettle 21, when the reaction kettle 21 is vacuumized, the pressure control kettle 5 can be simultaneously vacuumized to remove impurities. Specifically, as shown in fig. 1, the vacuum pumping device is a vacuum pump 35, a three-way valve 18 is disposed on a communication pipeline between the vacuum pump 35 and the gas outlet of the reaction kettle 21, and the three-way valve 18 can realize communication and disconnection between the gas outlet of the reaction kettle 21 and the vacuum pump 35 and the outside.
In the present invention, the gas hydrate preparation system may further include a constant temperature tank 36, and the reaction kettle 21, the hydrate collection kettle 16, the liquid recovery kettle 33, and the pressure control kettle 5 may be all disposed in the constant temperature tank 36. When the device is used, the constant temperature box 36 can be set to a preset reaction temperature (for example, 20 ℃ below zero to 50 ℃ below zero), so that the reaction temperature in the reaction kettle 21 can be ensured, and reaction gas and liquid can reach the preset reaction temperature when entering the reaction kettle 21, thereby effectively improving the reaction efficiency in the reaction kettle 21, and in addition, the stability of gas hydrate in the hydrate collection kettle 16 can be ensured. That is, the constant temperature tank 36 can control the temperatures of the reaction tank 21, the hydrate collection tank 16, the liquid recovery tank 33, and the pressure control tank 5.
In addition, in the present invention, as shown in fig. 1, the gas hydrate production system may include pressure monitors 3, 17 (e.g., pressure sensors) for monitoring the pressures in the pressure control tank 5 and the reaction tank 21, respectively, and a temperature monitor 11 (e.g., temperature sensor) for monitoring the temperature in the reaction tank 21. Of course, the gas hydrate production system may further include pressure monitors for monitoring the pressure in the hydrate collection tank 16 and the liquid recovery tank 33, respectively. The pressure monitor and the temperature monitor can be used for monitoring the pressure and temperature change conditions of the system in the experimental process on line.
In order to realize the automatic control of the gas hydrate preparation system, so as to simplify the operation, improve the reaction efficiency and reduce the human labor, the gas hydrate preparation system may further include a controller 38, the controller 38 may be configured to control the operation of the vacuum pumping device and the pressure control pump 8, and the controller 38 may be further electrically connected to the pressure monitor and the temperature monitor, respectively, for receiving the data collected by the pressure monitor and the temperature monitor.
In the present invention, in order to enhance the gas-liquid reaction and increase the generation rate and gas storage amount of the gas hydrate, a stirrer may be disposed in the reaction kettle 21. In the present invention, the stirrer is preferably configured to perform stirring by moving up and down in the reaction vessel 21, and the gas hydrate production system includes a driving member for driving the stirrer to move up and down.
Specifically, according to an embodiment of the present invention, as shown in fig. 1, the reaction kettle 21 is a column shape with a cylindrical cavity defined therein, the stirrer is a stirring magnetic ring 22 coaxial with the reaction kettle 21, and the driving member includes a plurality of magnets 23 arranged outside the reaction kettle 21 and arranged along a circumferential direction of the stirring magnetic ring 22, and a driving motor 37 for driving the plurality of magnets 23 to move up and down along an axial direction of the reaction kettle 21. Wherein, it can be understood that magnet 23 is blocky, and a plurality of magnets 23 are arranged along reation kettle 21's circumference interval, and stirring magnetic ring 22 is located reation kettle 21's same height with a plurality of magnets 23, and stirring magnetic ring 22 drives and strikes the liquid level from top to bottom under magnet 23's magnetic force effect, realizes the effective mixture of gas-liquid to improve gas hydrate's formation rate. Of course, in other embodiments, only one ring-shaped magnet may be included. In addition, the operation of the drive motor 37 may be controlled by the controller 38.
In the present invention, the reaction vessel 21 may be a high-pressure sapphire reaction vessel in order to facilitate observation of the reaction in the reaction vessel 21. As shown in fig. 1, the reaction kettle 21 may include a sapphire kettle body having an open top, and two fixing plates 31 respectively located above and below the sapphire kettle body, wherein the two fixing plates 31 are fixedly connected to each other through screws 20 and nuts 19, so as to fix and seal the sapphire kettle body.
A method for preparing a gas hydrate using the gas hydrate preparation system of the present invention will be described in detail with reference to fig. 1, the method comprising:
s1, filling liquid required for preparing the gas hydrate into the sapphire kettle body through the top opening of the sapphire kettle body, and fixing and sealing the reaction kettle 21 through the two fixing plates 31, the nuts 19 and the screws 20;
s2, vacuumizing the reaction kettle 21 and the pressure control kettle 5 through the vacuum pump 35, and adjusting the temperature of the constant temperature box 36 to be the temperature required by the experiment;
s3, monitoring temperature change in the reaction kettle 21 on line through the temperature monitor 11, introducing experimental gas in the gas cylinder 1 into the pressure control kettle 5 and the reaction kettle 21 after the temperature of the reaction kettle 21 reaches the experimental temperature, driving the third piston 6 to move through the pressure control pump 8 to adjust the pressure in the pressure control kettle 5 and the reaction kettle 21 to the pressure required by the experiment, closing the stop valve 10, starting the driving motor 37, adjusting the stirring rate required by the experiment, and starting the experiment;
s4, monitoring macroscopic form change and temperature and pressure change conditions in the reaction kettle 21 in the experimental process on line through the reaction kettle 21, the temperature monitor 11 and the pressure monitor 17, gradually reducing the pressure in the reaction kettle 21 along with the formation of the gas hydrate and tending to balance, and after the pressure is stabilized for a period of time, closing the driving motor 37 and stopping stirring;
s5, opening the stop valve 10, regulating the pressure in the pressure control kettle 5 and the hydrate collection kettle 16 through the pressure control pump 8, slowly opening the stop valves 12 and 14, then gradually pushing the third piston 6 in the pressure control kettle 5 to move upwards so as to transfer the gas hydrate and the residual liquid in the reaction kettle 21 to the hydrate collection kettle 16 under the condition of constant pressure, and then closing the stop valves 12 and 14;
s6, adjusting the pressure in the hydrate collection kettle 16 and the liquid recovery kettle 33 through the pressure control pump 8, slowly opening the stop valves 26 and 29, then gradually pushing the first piston 15 in the hydrate collection kettle 16 to move upwards so as to realize the separation of gas hydrate and liquid through the filter screen 27 under the condition of constant pressure, enabling the separated liquid to enter the liquid recovery kettle 33, enabling the gas hydrate to remain in the hydrate collection kettle 16, and closing the stop valves 26 and 29;
s7, regulating the pressure in the liquid recovery kettle 33 through the pressure control pump 8, slowly opening the stop valves 30 and 24, gradually pushing the second piston 32 in the liquid recovery kettle 33 to move upwards, and pressing the liquid into the reaction kettle 21 to carry out the secondary gas hydrate preparation experiment.
The gas hydrate preparation system disclosed by the invention not only can be used for quickly and efficiently preparing the gas hydrate, collecting the gas hydrate and recycling unreacted liquid, but also has the characteristics of visual preparation process, simple process, convenience in operation, high automation degree and the like.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The gas hydrate preparation system comprises a reaction kettle (21), a hydrate collection kettle (16) and a liquid recovery kettle (33), wherein the reaction kettle (21) provides a place for gas and liquid to react to generate gas hydrate, a feed inlet of the hydrate collection kettle (16) is communicated with a solid-liquid outlet of the reaction kettle (21) to collect residual liquid and generated gas hydrate in the reaction kettle (21), a feed inlet of the liquid recovery kettle (33) is communicated with a discharge outlet of the hydrate collection kettle (16) to recover liquid in the hydrate collection kettle (16), and a liquid outlet of the liquid recovery kettle (33) is communicated with a liquid inlet of the reaction kettle (21) to input the recovered liquid into the reaction kettle (21).
2. A gas hydrate preparation system according to claim 1,
the reaction kettle (21) is provided with a gas outlet, and the gas hydrate preparation system comprises a vacuum-pumping device communicated with the gas outlet; and/or
A collecting cavity is defined in the hydrate collecting kettle (16), the feed inlet and the discharge outlet of the hydrate collecting kettle (16) are communicated with the collecting cavity, a first piston (15) is arranged in the hydrate collecting kettle (16), and the first piston (15) is arranged to be capable of controlling the pressure in the collecting cavity through movement and pressing the liquid in the collecting cavity into the liquid recovery kettle (33).
3. A gas hydrate preparation system according to claim 2,
a liquid storage cavity is defined in the liquid recovery kettle (33), the liquid inlet and the liquid outlet of the liquid recovery kettle (33) are communicated with the liquid storage cavity, a second piston (32) is arranged in the liquid recovery kettle (33), and the second piston (32) is arranged to press liquid in the liquid storage cavity into the reaction kettle (21) through movement; and/or
The discharge port of the hydrate collecting kettle (16) is provided with a filtering device, and the filtering device is set to be capable of preventing the gas hydrate in the collecting cavity from being discharged from the discharge port.
4. A gas hydrate preparation system according to claim 3,
the reaction kettle (21) is provided with a gas inlet, the gas hydrate preparation system comprises a gas cylinder (1) communicated with the gas inlet and a pressure control device arranged on a communication pipeline between the gas cylinder (1) and the gas inlet, and the pressure control device is used for controlling the pressure of gas entering the reaction kettle (21); and/or
The gas hydrate preparation system includes a controller (38), the controller (38) being configured to control operation of the evacuation device.
5. A gas hydrate preparation system as claimed in claim 4, wherein the pressure control device comprises a pressure control kettle (5), the pressure control kettle (5) comprises a gas storage cavity defined inside and a gas inlet and a gas outlet communicated with the gas storage cavity, the gas inlet of the pressure control kettle (5) is communicated with the gas outlet of the gas cylinder (1), the gas outlet of the pressure control kettle (5) is communicated with the gas inlet of the reaction kettle (21), a third piston (6) is arranged in the pressure control kettle (5), and the third piston (6) is arranged to control the pressure of the gas storage cavity through movement.
6. A gas hydrate preparation system according to claim 5,
the gas hydrate production system comprises a pressure controlled pump (8), the pressure controlled pump (8) being arranged to be able to drive the movement of the first piston (15), the second piston (32) and the third piston (6), respectively; and/or
The gas hydrate preparation system comprises a constant temperature box (36), wherein the reaction kettle (21), the hydrate collection kettle (16), the liquid recovery kettle (33) and the pressure control kettle (5) are all arranged in the constant temperature box (36).
7. A gas hydrate preparation system according to claim 6,
the controller (38) is arranged to control operation of the pressure controlled pump (8); and/or
The gas hydrate preparation system comprises pressure monitors (3, 17) for monitoring the pressure in the pressure control kettle (5) and the reaction kettle (21) respectively, and a temperature monitor (11) for monitoring the temperature in the reaction kettle (21).
8. A gas hydrate preparation system according to claim 7, wherein the controller (38) is electrically connected to the pressure monitors (3, 17) and the temperature monitor (11) for receiving data collected by the pressure monitors (3, 17) and the temperature monitor (11), respectively.
9. A gas hydrate preparation system according to any one of claims 1 to 8, wherein a stirrer is arranged in the reaction vessel (21), the stirrer being arranged to stir by moving up and down in the reaction vessel (21), the gas hydrate preparation system comprising a drive member for driving the stirrer up and down.
10. The gas hydrate preparation system according to claim 9, wherein the reaction kettle (21) is columnar with a cylindrical cavity defined therein, the stirrer is a stirring magnetic ring (22) coaxial with the reaction kettle (21), and the driving member comprises a plurality of magnets (23) arranged outside the reaction kettle (21) along a circumferential direction of the stirring magnetic ring (22) and a driving motor (37) for driving the plurality of magnets (23) to move up and down along an axial direction of the reaction kettle (21).
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| CN2019108942507 | 2019-09-20 | ||
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