CN117088369A - Continuous preparation, crushing and discharging method and device for carbon dioxide hydrate - Google Patents

Continuous preparation, crushing and discharging method and device for carbon dioxide hydrate Download PDF

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Publication number
CN117088369A
CN117088369A CN202310977268.XA CN202310977268A CN117088369A CN 117088369 A CN117088369 A CN 117088369A CN 202310977268 A CN202310977268 A CN 202310977268A CN 117088369 A CN117088369 A CN 117088369A
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China
Prior art keywords
carbon dioxide
cavity
crushing
dioxide hydrate
temperature control
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CN202310977268.XA
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Inventor
张海翔
庞晓琳
干毕成
李中
何金钢
刘笑莹
宣英龙
王殿举
李占东
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Sanya Offshore Oil And Gas Research Institute Of Northeast Petroleum University
Northeast Petroleum University
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Sanya Offshore Oil And Gas Research Institute Of Northeast Petroleum University
Northeast Petroleum University
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Priority to CN202310977268.XA priority Critical patent/CN117088369A/en
Publication of CN117088369A publication Critical patent/CN117088369A/en
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/50—Carbon dioxide
    • C01B32/55—Solidifying

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

The invention relates to a continuous preparation, crushing and discharging method and device for carbon dioxide hydrate, comprising a reactor with an inner cavity and a temperature control water tank, wherein the inner cavity of the reactor is divided into a generation cavity and a crushing cavity by a horizontal partition plate, the generation cavity is positioned above the crushing cavity, and the partition plate is connected with a driving mechanism for driving the partition plate to move so that the generation cavity and the crushing cavity are communicated and sealed; the upper part of the crushing cavity is connected with a feeding system, the outer wall of the reactor is wound and provided with a temperature control Guan Xianjuan, a circulating pump is arranged in the temperature control water tank, one end of the temperature control Guan Xianjuan is connected with the temperature control water tank, and the other end of the temperature control Guan Xianjuan is connected with the circulating pump; the top of the reactor is provided with a stirring motor, the stirring motor is connected with a stirrer, and the stirrer is positioned in the generation cavity; the crushing cavity is internally provided with a crushing mechanism, and the bottom of the crushing cavity is provided with a discharge hole. The invention can reduce the initial generation time of the carbon dioxide hydrate and improve the preparation efficiency.

Description

Continuous preparation, crushing and discharging method and device for carbon dioxide hydrate
Technical Field
The invention belongs to the technical field of preparation of carbon dioxide hydrate, and in particular relates to a method and a device for continuously preparing, crushing and discharging carbon dioxide hydrate.
Background
The development of industry has led to a great increase in the emission of carbon dioxide, which aggravates the global greenhouse effect, destroys the ecological environment, and solves the problems associated with carbon dioxide emission, and besides reducing the emission of carbon dioxide or strictly controlling the emission index of carbon dioxide, can also be another way: i.e., the capture and sequestration of the dioxide, and ultimately the storage of the carbon dioxide underground.
At present, carbon dioxide sequestration is mainly divided into sequestration on land and sequestration on sea, but most students consider that the sequestration of carbon dioxide is the best place in waste oil and gas production areas due to cost consideration, and the primary reasons are that compared with areas with unfamiliar geological features, the acquired geological data in the areas are rich and the knowledge is more comprehensive. After carbon dioxide on the ocean is converted to react with minerals such as carbonate, the minerals are sealed and stored by the high pressure action of seawater, which is one of the useful means for utilizing industrial waste. In the aspect of improving oil and gas recovery ratio, carbon dioxide injection for oil displacement is also a common oil displacement mode.
CN115076594a discloses a carbon dioxide sequestrationThe method. By CO filled with high concentration brine 2 The storage container is placed in the sea water with the depth of not less than 3000 m; CO in liquid state 2 Is conveyed into a sealing container and utilizes liquid CO overflowed into a storage liquid inlet pipe and a liquid discharge pipe 2 Contact with sea water to produce CO 2 The hydrate plugs the storage container, thereby realizing the sealing effect. CN106904616a discloses a geological carbon dioxide sequestration structure and sequestration method, which is characterized in that carbon dioxide generated in industrial production is intensively recovered and injected into abandoned oil fields and gas fields, so that carbon dioxide and underground water form solid carbon dioxide hydrate, thereby achieving the purposes of sequestration and emission reduction. CN211847165U discloses a carbon dioxide stratum sealing system, which mainly prepares carbon dioxide hydrate through a hydrate reaction device, and then conveys the hydrate to a coal and oil gas goaf in a pipeline transportation mode, and seals the stratum in the form of hydrate. In summary, the most main sealing systems at present mainly include deep sea sealing, abandoned coal seam sealing, and the like. However, the existing technologies and methods have the problems of high cost, low efficiency, poor safety, complex device structure and the like, and are not suitable for large-scale investment. How to improve the efficiency of preparing and sequestering carbon dioxide hydrates is a problem.
CN104445197a discloses a carbon dioxide hydrate preparation device, comprising: a reaction unit for accommodating water and carbon dioxide for reaction; the liquid circulation unit is respectively connected with a liquid inlet at the top end and a liquid outlet at the bottom end of the reaction unit and is used for supplying raw material water and circulating carbon dioxide hydrate; the air inlet unit is connected with an air inlet at the top end of the reaction unit and is used for supplying carbon dioxide raw materials; the cracking unit is arranged in the reaction unit, and the surface of the cracking unit is provided with gaps with preset density and is used for cracking the carbon dioxide hydrate; and a heat exchange unit positioned below the cracking unit for absorbing heat of the carbon dioxide hydrate. The rupture unit adopts a plate with holes, so that hydrate is difficult to effectively crush. During preparation, the initial growth speed of the carbon dioxide hydrate is low, and the efficiency is low. In addition, in order to ensure that the equipment is in a constant temperature state, the existing carbon dioxide hydrate preparation device is generally arranged inside a constant temperature box, is only suitable for small-sized equipment, such as carbon dioxide hydrate preparation equipment adopted in a laboratory, and is not suitable for large-sized industrial equipment.
Disclosure of Invention
The invention aims to solve the technical problems of providing a method and a device for continuously preparing, crushing and discharging carbon dioxide hydrate, which can reduce the initial generation time of the carbon dioxide hydrate, improve the preparation efficiency, control the reaction temperature within a certain range, realize industrial application and directly seal the prepared carbon dioxide hydrate in the production area of oil, gas and ore.
In order to solve the problems, the invention adopts the following technical scheme: the device comprises a reactor with an inner cavity and a temperature control water tank, wherein the inner cavity of the reactor is divided into a generation cavity and a crushing cavity by a horizontal partition plate, the generation cavity is positioned above the crushing cavity, and the partition plate is connected with a driving mechanism for driving the partition plate to move so that the generation cavity and the crushing cavity are communicated and sealed; the upper part of the crushing cavity is connected with a feeding system, the outer wall of the reactor is wound and provided with a temperature control Guan Xianjuan, a circulating pump is arranged in the temperature control water tank, one end of the temperature control Guan Xianjuan is connected with the temperature control water tank, and the other end of the temperature control Guan Xianjuan is connected with the circulating pump; the top of the reactor is provided with a stirring motor, the stirring motor is connected with a stirrer, and the stirrer is positioned in the generation cavity; the crushing cavity is internally provided with a crushing mechanism, and the bottom of the crushing cavity is provided with a discharge hole.
Further, a lifting mechanism is arranged on the top cover of the reactor, the lifting mechanism is connected with a pressing plate, and the pressing plate is positioned in the generation cavity.
Further, the feeding system comprises a carbon dioxide collecting tank, a pressurizing device, a first precooling device, a water tank and a second precooling device, a water inlet and an air inlet are formed in the side wall of the generating cavity, the carbon dioxide collecting tank, the pressurizing device, the first precooling device and the air inlet are sequentially connected, and the water tank and the second precooling device are sequentially connected with the water inlet.
Further, the crushing mechanism comprises a crushing motor, the crushing motor is connected with a rotating shaft, and a crushing blade is arranged on the rotating shaft.
Further, a temperature sensor and a pressure sensor are arranged in the generating cavity.
Further, the outer wall of the reactor is provided with a positioning mechanism for fixing the reactor on the inner wall of the shaft. The reactor of the continuous preparation, crushing and discharge device of the carbon dioxide hydrate is arranged at the bottom of an oil, gas or ore exploitation well;
the continuous preparation, crushing and removing method of the carbon dioxide hydrate comprises the following steps:
vacuumizing the generating cavity, and circularly introducing water in the temperature control water tank into the temperature control Guan Xianjuan to enable the temperature in the generating cavity to reach the process requirement;
pressurizing and precooling carbon dioxide, introducing the carbon dioxide into a generation cavity, and simultaneously precooling water and introducing the water into the generation cavity;
the stirrer stirs water and carbon dioxide, and the water reacts with the carbon dioxide to generate carbon dioxide hydrate;
after the reaction is finished, the driving mechanism drives the partition plate to move, the generation cavity is communicated with the crushing cavity, carbon dioxide hydrate in the generation cavity falls into the crushing cavity, the crushing mechanism is utilized to crush the carbon dioxide hydrate, the crushed carbon dioxide hydrate falls into an oil, gas or ore production area through the discharge port, and the carbon dioxide hydrate is kept stable under the formation pressure;
after all the carbon dioxide hydrate in the generation cavity is discharged, the driving mechanism drives the partition plate to reset, so that the partition plate enables the generation cavity and the crushing cavity to be mutually independent, water and carbon dioxide are introduced into the generation cavity again, the residual carbon dioxide hydrate on the stirrer enters the water and the carbon dioxide under the action of centrifugal force, the residual carbon dioxide hydrate can serve as crystal nucleus, and the carbon dioxide hydrate can directly grow on the crystal nucleus, so that a nucleation stage is omitted, and the preparation efficiency is improved.
Further, the carbon dioxide is pressurized to 1.27 to 4.6MPa, precooled to 275 to 295 Kelvin and then introduced into the generation cavity, and the water is precooled to 275 to 283 Kelvin and then introduced into the generation cavity.
Further, the pressure in the generation cavity is 7.2MPa or more, and the temperature is 270-280 Kelvin.
Further, the temperature control water tank and the feeding system are arranged on the ground.
The beneficial effects of the invention are as follows: 1. according to the invention, the temperature control Guan Xianjuan is wound on the outer wall of the reactor, when the reactor works, the temperature control water tank controls the water in the reactor to be in a constant temperature range, and the water in the temperature control water tank is introduced into the temperature control Guan Xianjuan, so that the water in the temperature control water tank circularly flows, the temperature of the reactor is controlled, the temperature in the reactor is prevented from being too high or too low, the temperature in the reactor is kept stable, and the stable growth of hydrate is facilitated. The heat preservation mode has simple structure and good heat preservation effect, is suitable for reactors with various sizes, and is favorable for realizing industrial application.
2. The stirrer not only plays a role in stirring water and carbon dioxide, but also plays a role in retaining a small amount of carbon dioxide hydrate, in the preparation process of the carbon dioxide hydrate, the hydrate cannot fall into a crushing cavity, but stays on the stirrer, when the carbon dioxide hydrate is prepared next time, centrifugal force is generated by rotation of the stirrer, the residual carbon dioxide hydrate on the stirrer rapidly and uniformly enters water and carbon dioxide under the action of the centrifugal force, the residual carbon dioxide hydrate serves as crystal nucleus, new carbon dioxide hydrate can directly grow on the crystal nucleus, the nucleation process is saved, the nucleation time is saved, and therefore, the preparation efficiency is improved.
3. The reactor of the invention has simple structure, is directly installed in an oil, gas or ore exploitation well, and the prepared carbon dioxide hydrate is directly filled and sealed in an oil, gas or ore exploitation area to realize the sealing and storage of carbon dioxide.
4. By crushing the carbon dioxide hydrate, the carbon dioxide hydrate is prevented from blocking the discharge channel, and simultaneously the carbon dioxide hydrate is promoted to fill the space in the oil, gas or ore mining area, so that the filling gap is reduced, and the filling quantity in unit volume is improved.
Drawings
FIG. 1 is a schematic illustration of the present invention;
reference numerals: 1-a reactor; 2-a separator; 3-generating a cavity; 4-a crushing cavity; 5-a temperature control water tank; 6-a temperature control tube coil; 7-a circulating pump; 8, a stirring motor; 9-a stirrer; 10, a discharge hole; 11-a lifting mechanism; 12-pressing plate; 13-a carbon dioxide collection tank; 14-a pressurizing device; 15-a first pre-cooling device; 16-a water tank; 17-a water inlet; 18-an air inlet; 19-crushing; 20-crushing blade; 21-a temperature sensor; 22-a pressure sensor; 23-a positioning mechanism; 24-a second pre-cooling device; 100-well bore.
Detailed Description
The invention will be further described with reference to the drawings and examples.
The invention discloses a continuous preparation, crushing and discharging device for carbon dioxide hydrate, which is shown in figure 1 and comprises a reactor 1 with an inner cavity and a temperature control water tank 5, wherein the inner cavity of the reactor 1 is divided into a generation cavity 3 and a crushing cavity 4 by a horizontal partition board 2, the generation cavity 3 is positioned above the crushing cavity 4, and the partition board 2 is connected with a driving mechanism for driving the partition board 2 to move so that the generation cavity 3 and the crushing cavity 4 are communicated and sealed; the upper part of the crushing cavity 4 is connected with a feeding system, the outer wall of the reactor 1 is wound with a temperature control pipeline coil 6, a circulating pump 7 is arranged in the temperature control water tank 5, one end of the temperature control pipeline coil 6 is connected with the temperature control water tank 5, and the other end is connected with the circulating pump 7; the top of the reactor 1 is provided with a stirring motor 8, the stirring motor 8 is connected with a stirrer 9, and the stirrer 9 is positioned in the generation cavity 3; the crushing cavity 4 is internally provided with a crushing mechanism, and the bottom of the crushing cavity 4 is provided with a discharge port 10.
The reactor 1 adopts a metal tank body, the section of the generating cavity 3 is round or rectangular, the crushing cavity 4 is hemispherical, and the top of the reactor 1 is sealed by a top cover. The baffle 2 adopts the metal sheet, can splice into the circular plate by the polylith metal sheet, and the both ends of every metal sheet set up the round pin axle, round pin axle and reactor 1 lateral wall normal running fit, and actuating mechanism can be a plurality of upset motors, and every upset motor links to each other with the round pin axle of a metal sheet. When the generation cavity 3 is communicated with the crushing cavity 4, the overturning motor drives each metal plate to rotate 90 degrees, so that the metal blocks are in a vertical state; when the generation cavity 3 and the crushing cavity 4 are required to be separated, the overturning motor drives each metal plate to rotate to a horizontal state, and the metal plates can be spliced into the partition plate 2. In addition, the partition plate 2 can also be horizontally inserted into the reactor 1, the driving mechanism adopts a linear motor, an air cylinder or a hydraulic cylinder and the like, so that the partition plate 2 can be pushed to horizontally move, when the generation cavity 3 and the crushing cavity 4 are required to be communicated, the linear motor, the air cylinder or the hydraulic cylinder pulls the partition plate 2 to outwards move out of the reactor 1, and when the generation cavity 3 and the crushing cavity 4 are required to be separated, the linear motor, the air cylinder or the hydraulic cylinder pushes the partition plate 2 to inwards move into the reactor 1.
The temperature control water tank 5 stores temperature control water, the temperature control water tank 5 has the function of adjusting water temperature, and a specific water temperature adjusting mode adopts the prior art, so that the temperature of the temperature control water is always in a certain range. The temperature control pipeline 6 adopts a pipeline, is wound on the outer wall of the reactor 1, and is closely contacted between two adjacent circles of pipelines without leaving a gap, so that the outer wall of the reactor 1 is covered, and the temperature of the reactor 1 can be controlled more effectively. The circulating pump 7 drives the temperature control water to enter the temperature control pipeline coil 6, the temperature control water returns to the temperature control water tank 5 after flowing through the temperature control pipeline coil 6, and the temperature of the reactor 1 can be effectively controlled through circulating flow. The temperature control mode is suitable for reactors 1 with various sizes, and is beneficial to realizing industrial application.
In order to promote uniform contact between the water and the carbon dioxide, a stirrer 9 is provided in the generation chamber 3. The stirring motor 8 is used for driving the stirrer 9 to rotate, and the stirring motor 8 can be arranged on the upper surface of the top cover. In the growth process of the carbon dioxide hydrate, part of the carbon dioxide hydrate can be attached to the stirrer 9, and when the carbon dioxide hydrate is crushed, the hydrates cannot fall into the crushing cavity 4, but stay on the stirrer 9, when the carbon dioxide hydrate is prepared next time, the stirrer 9 rotates to generate centrifugal force, the residual carbon dioxide hydrate on the stirrer 9 rapidly and uniformly enters water and carbon dioxide under the action of the centrifugal force, the residual carbon dioxide hydrate serves as crystal nucleus, new carbon dioxide hydrate can directly grow on the crystal nucleus, the nucleation process is saved, the nucleation time is saved, and therefore, the preparation efficiency is improved.
The crushing mechanism is used for crushing the carbon dioxide hydrate into small particles so as to facilitate the discharge and the sealing of the carbon dioxide hydrate, prevent the carbon dioxide hydrate from blocking a discharge channel, simultaneously promote the carbon dioxide hydrate to fill the space in an oil, gas or ore mining area, reduce filling gaps and improve the filling quantity in unit volume. The crushing mechanism specifically comprises a crushing motor 19, the crushing motor 19 is connected with a rotating shaft, and a crushing blade 20 is arranged on the rotating shaft.
The carbon dioxide hydrate is solid and can stably stay between the inner wall of the reactor 1 and the stirrer 9, and is difficult to fall into the crushing cavity 4 by virtue of self gravity, so the invention is provided with the lifting mechanism 11 on the top cover of the reactor 1, the lifting mechanism 11 is connected with the pressing plate 12, and the pressing plate 12 is positioned in the generating cavity 3. Specifically, a plurality of concave grooves are formed in the top cover of the reactor 1, a lifting mechanism 11 is arranged in each groove, and the lifting mechanism 11 is positioned on the upper surface of the top cover and is connected with the pressing plate 12 through a connecting rod. In order to improve the sealing performance, the upper surface of the top cover is provided with a sealing gasket. The lifting mechanism 11 may be a linear motor, a hydraulic cylinder, or the like. The number of the pressing plates 12 can be multiple, each pressing plate 12 is connected with the lifting mechanism 11 through a vertical connecting rod, and the pressing plates 12 and the stirrer 9 are properly spaced, so that the pressing plates 12 and the stirrer are prevented from being damaged due to collision during operation. In addition, the pressing plate 12 can also be annular, and is horizontally arranged, and the stirrer 9 is positioned in the inner hole of the pressing plate 12. After the preparation of the carbon dioxide hydrate is completed, the partition plate 2 is opened, and then the pressing plate 12 is driven to move downwards by the lifting mechanism 11, so that the carbon dioxide hydrate in the generation cavity 3 is pressed into the crushing cavity 4.
The feeding system is used for introducing water and carbon dioxide, and comprises a water supply system and a carbon dioxide supply system, wherein the carbon dioxide supply system comprises a carbon dioxide collecting tank 13, a pressurizing device 14 and a first pre-cooling device 15, the water supply system comprises a water tank 16 and a second pre-cooling device 24, the carbon dioxide collecting tank 13 is used for storing the collected carbon dioxide, and the pressurizing device 14 is used for pressurizing the carbon dioxide so that the pressure of the carbon dioxide meets the hydrate generation condition. The first precooling apparatus 15 is used for cooling the carbon dioxide so that the temperature of the carbon dioxide satisfies the hydrate formation conditions. The water tank 16 is used for storing water for reaction, and the second precooling device 24 is used for precooling a book for reaction. The side wall of the generation cavity 3 is provided with a water inlet 17 and an air inlet 18, the carbon dioxide collection tank 13, the pressurizing device 14, the first precooling device 15 and the air inlet 18 are sequentially connected, and the water tank 16 and the second precooling device 24 are sequentially connected with the water inlet 17. In order to facilitate the delivery of the reaction water to the generation chamber 3, a water pump may be provided between the second pre-cooling device 24 and the water inlet 17. To control the flow, a flow meter and a solenoid valve may be provided at the water inlet 17 and the air inlet 18.
In order to monitor the temperature and pressure in the generation chamber 3 in real time, a temperature sensor 21 and a pressure sensor 22 are provided in the generation chamber 3. The temperature sensor 21 and the pressure sensor 22 detect the temperature and the pressure in the generating cavity 3, and the temperature of the temperature-controlled water and the pressurizing degree of the pressurizing device 14 are regulated according to the detection result, so that the temperature and the pressure in the generating cavity 3 are always within the process requirement range.
The reactor 1 of the invention can directly fill the prepared carbon dioxide hydrate into the production area of oil, gas and ore, and in order to facilitate the fixation of the reactor 1, the outer wall of the reactor 1 is provided with a positioning mechanism 23 for fixing the reactor 1 on the inner wall of the shaft 100. The well bore 100, that is, an oil well, a gas well, a mine shaft or the like, and the positioning mechanism 23 may be a plurality of hanging mechanisms for hanging the reactor 1 on the inner wall of the well bore 100, so as to ensure the stability of hanging. After being discharged from a discharge port 10 at the bottom of the crushing cavity 4, the crushed carbon dioxide hydrate falls into an oil, gas or ore production area, and fills the mined space, so that the stability of the stratum can be improved, the collapse risk is reduced, and the carbon dioxide hydrate can be kept stable and is not easy to decompose under the pressure of the stratum, so that the sealing and storage of the carbon dioxide hydrate can be realized.
The continuous preparation, crushing and discharging method of the carbon dioxide hydrate comprises the following steps:
the reactor 1 of the continuous preparation and crushing discharge device for the carbon dioxide hydrate shown in the figure 1 is arranged at the bottom of an oil, gas or ore exploitation well, the prepared carbon dioxide hydrate can be directly discharged to the bottom of the oil, gas or ore exploitation well, then the carbon dioxide hydrate is pushed into an exploited area, the carbon dioxide hydrate is not required to be conveyed by a pipeline, the sealing efficiency of the carbon dioxide hydrate is higher, and the risk of pipeline blockage is avoided.
Because the underground space is limited, the temperature control water tank 5 and the feeding system are arranged on the ground, the temperature control water tank 5 is connected with the temperature control Guan Xianjuan 6 through a flexible pipeline, and the feeding system is connected with the water inlet 17 and the air inlet 18 through a flexible pipeline. The temperature control water tank 5 and the feeding system are arranged on the ground, so that the collected carbon dioxide can be stored in the carbon dioxide collecting tank 13 more conveniently, and meanwhile, the water temperature in the temperature control water tank 5 can be controlled and regulated conveniently.
And the generation cavity 3 is vacuumized, so that the generation of hydrate is prevented from being influenced by impurity gases such as air. The water in the temperature control water tank 5 is circulated and introduced into the temperature control Guan Xianjuan so that the temperature in the generating cavity 3 reaches the process requirement, and specifically, the temperature in the generating cavity 3 is controlled to be 270-280 Kelvin.
The carbon dioxide is pressurized, precooled and then introduced into the generation cavity 3, and meanwhile, the water is precooled and then introduced into the generation cavity 3. Specifically, carbon dioxide is pressurized to 1.27 to 4.6MPa, precooled to 275 to 295 Kelvin and then introduced into the generation cavity 3, and water precooled to 275 to 283 Kelvin and then introduced into the generation cavity 3. The pressure in the generation cavity 3 is 7.2MPa or more, and the carbon dioxide can be conveyed to the generation cavity 3 by using an air pump.
The stirrer 9 stirs water and carbon dioxide, and the water reacts with the carbon dioxide to form carbon dioxide hydrate. The temperature and pressure in the generation chamber 3 are detected in real time by the temperature sensor 21 and the pressure sensor 22, and when the temperature is too high or too low, the temperature in the generation chamber 3 is adjusted by adjusting the water temperature of the temperature-controlled water. When the pressure in the generation chamber 3 is too low, carbon dioxide is again introduced to increase the pressure.
After the completion of the reaction, the stirrer 9 stops rotating. The driving mechanism drives the partition plate 2 to move, the generation cavity 3 is communicated with the crushing cavity 4, carbon dioxide hydrate in the generation cavity 3 falls into the crushing cavity 4, and the lifting mechanism 11 can be adopted to push the pressing plate 12 to move downwards so as to push the carbon dioxide hydrate to rapidly fall into the crushing cavity 4. Crushing the carbon dioxide hydrate by using a crushing mechanism, wherein the crushed carbon dioxide hydrate falls into a production area of oil, gas or ore through a discharge hole 10, and the carbon dioxide hydrate is kept stable under the formation pressure.
After all the carbon dioxide hydrate in the generation cavity 3 is discharged, the driving mechanism drives the baffle plate 2 to reset, so that the baffle plate 2 separates the generation cavity 3 from the crushing cavity 4, water and carbon dioxide are introduced into the generation cavity 3 again, the stirrer 9 is started again, the residual carbon dioxide hydrate on the stirrer 9 enters the water and the carbon dioxide under the action of centrifugal force, the residual carbon dioxide hydrate can be used as a crystal nucleus, and the carbon dioxide hydrate can directly grow on the crystal nucleus, so that a nucleation stage is omitted, and the preparation efficiency is improved.
It is known that hydrate generation includes two stages of nucleation, which is a process of forming stable hydrate nuclei having a critical size, and growth, which is a process of continuously attaching new hydrates to the framework with the nuclei as the framework, so that the volume of the hydrates gradually increases. In the invention, the carbon dioxide hydrate remained on the stirrer 9 is used as the crystal nucleus for preparing the carbon dioxide hydrate next time, and the new carbon dioxide hydrate can directly grow on the basis of the crystal nucleus, so that the nucleation process is omitted, the carbon dioxide hydrate can be obtained more rapidly, and the preparation efficiency is improved.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. Carbon dioxide hydrate prepares, smashes discharging device in succession, its characterized in that: the device comprises a reactor (1) with an inner cavity and a temperature control water tank (5), wherein the inner cavity of the reactor (1) is divided into a generation cavity (3) and a crushing cavity (4) by a horizontal partition board (2), the generation cavity (3) is positioned above the crushing cavity (4), and the partition board (2) is connected with a driving mechanism which drives the partition board (2) to move so that the generation cavity (3) and the crushing cavity (4) are communicated and sealed; the upper part of the crushing cavity (4) is connected with a feeding system, the outer wall of the reactor (1) is wound with a temperature control Guan Xianjuan (6), a circulating pump (7) is arranged in the temperature control water tank (5), one end of the temperature control pipeline ring (6) is connected with the temperature control water tank (5), and the other end of the temperature control pipeline ring is connected with the circulating pump (7); the top of the reactor (1) is provided with a stirring motor (8), the stirring motor (8) is connected with a stirrer (9), and the stirrer (9) is positioned in the generation cavity (3); the crushing cavity (4) is internally provided with a crushing mechanism, and the bottom of the crushing cavity (4) is provided with a discharge port (10).
2. The continuous production, pulverization and discharge device for carbon dioxide hydrate according to claim 1, wherein: the reactor is characterized in that a lifting mechanism (11) is arranged on a top cover of the reactor (1), the lifting mechanism (11) is connected with a pressing plate (12), and the pressing plate (12) is positioned in the generation cavity (3).
3. The continuous production, pulverization and discharge device for carbon dioxide hydrate according to claim 1, wherein: the feeding system comprises a carbon dioxide collecting tank (13), a pressurizing device (14), a first precooling device (15), a water tank (16) and a second precooling device (24), a water inlet (17) and an air inlet (18) are formed in the side wall of the generation cavity (3), the carbon dioxide collecting tank (13), the pressurizing device (14), the first precooling device (15) and the air inlet (18) are sequentially connected, and the water tank (16), the second precooling device (24) and the water inlet (17) are sequentially connected.
4. The continuous production, pulverization and discharge device for carbon dioxide hydrate according to claim 1, wherein: the crushing mechanism comprises a crushing motor (19), the crushing motor (19) is connected with a rotating shaft, and a crushing blade (20) is arranged on the rotating shaft.
5. The continuous production, pulverization and discharge device for carbon dioxide hydrate according to claim 1, wherein: a temperature sensor (21) and a pressure sensor (22) are arranged in the generating cavity (3).
6. The continuous production, pulverization and discharge device for carbon dioxide hydrate according to claim 1, wherein: the outer wall of the reactor (1) is provided with a positioning mechanism (23) for fixing the reactor (1) on the inner wall of the shaft (100).
7. The continuous preparation, crushing and discharge method of the carbon dioxide hydrate is characterized by comprising the following steps of: comprising the following steps:
installing the reactor (1) of the continuous preparation, crushing and discharging device of the carbon dioxide hydrate according to claims 1, 2, 3, 4, 5 or 6 at the bottom of an oil, gas or ore exploitation well;
vacuumizing the generating cavity (3), and circularly introducing water in the temperature control water tank (5) into the temperature control Guan Xianjuan (6) to enable the temperature in the generating cavity (3) to reach the process requirement;
pressurizing and precooling carbon dioxide, introducing the carbon dioxide into the generation cavity (3), and simultaneously, introducing the water into the generation cavity (3) after precooling;
the stirrer (9) stirs water and carbon dioxide, and the water reacts with the carbon dioxide to generate carbon dioxide hydrate;
after the reaction is finished, the driving mechanism drives the partition board (2) to move, the generating cavity (3) is communicated with the crushing cavity (4), carbon dioxide hydrate in the generating cavity (3) falls into the crushing cavity (4), the crushing mechanism is utilized to crush the carbon dioxide hydrate, the crushed carbon dioxide hydrate falls into an oil, gas or ore production area through the discharge port (10), and the carbon dioxide hydrate is kept stable under the formation pressure;
after all the carbon dioxide hydrate in the generation cavity (3) is discharged, the driving mechanism drives the partition board (2) to reset, the partition board (2) separates the generation cavity (3) from the crushing cavity (4), water and carbon dioxide are introduced into the generation cavity (3) again, the residual carbon dioxide hydrate on the stirrer (9) enters the water and the carbon dioxide under the action of centrifugal force, the residual carbon dioxide hydrate can be used as crystal nucleus, and the carbon dioxide hydrate can directly grow on the crystal nucleus, so that a nucleation stage is omitted, and the preparation efficiency is improved.
8. The continuous production, pulverization and discharge device for carbon dioxide hydrate according to claim 7, wherein: pressurizing the carbon dioxide to 1.27-4.6 MPa, precooling to 275-295 Kelvin, then introducing the carbon dioxide into the generation cavity (3), precooling the water to 275-283 Kelvin, and then introducing the water into the generation cavity (3).
9. The continuous production, pulverization and discharge method of carbon dioxide hydrate according to claim 7, wherein: the pressure in the generating cavity (3) is higher than or equal to 7.2MPa, and the temperature is 270-280 Kelvin.
10. The continuous production, pulverization and discharge method of carbon dioxide hydrate according to claim 7, wherein: the temperature control water tank (5) and the feeding system are arranged on the ground.
CN202310977268.XA 2023-08-04 2023-08-04 Continuous preparation, crushing and discharging method and device for carbon dioxide hydrate Pending CN117088369A (en)

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