A dry ice rapid liquefaction, pressurization and conveying system and method

Abstract

The present application discloses a rapid liquefaction, pressurization and transportation system for dry ice, which includes a dry ice raw material cylinder, a dry ice automatic feeding device, a liquid carbon dioxide outlet valve, a heating and heat preservation jacket layer, a high-pressure piston container, a temperature and pressure sensor, a two-way hydraulic cylinder and a high-pressure hydraulic station; the top of the dry ice raw material cylinder is open for feeding dry ice raw materials, and the bottom is connected to the dry ice automatic feeding device through a pipeline; one end of the dry ice automatic feeding device is connected to the dry ice raw material cylinder, the other end is connected to the high-pressure piston container through a pipeline, and a hydraulic device is connected to the side wall at the same time; the lower end of the high-pressure piston container is controlled by the two-way hydraulic cylinder to make the internal piston move up and down reciprocally; the present application uses heating means to convert solid dry ice into liquid carbon dioxide, thereby realizing the rapid on-site preparation of liquid carbon dioxide, effectively saving costs and improving safety, and at the same time having high preparation efficiency, simple operation and small occupied space.

Description

Technical Field

[0001] The present invention relates to the field of preparing liquid carbon dioxide, and particularly to a rapid liquefaction, pressurization and transportation system for dry ice. Background Art

[0002] As a widely used industrial material and raw material, liquid carbon dioxide is widely used in refrigerants, artificial rainfall, and the manufacturing processes of soda ash, urea, etc. In addition, in the newly emerging technology of liquid carbon dioxide fracturing for rock breaking, liquid carbon dioxide plays an indispensable role. Therefore, its preparation, storage, and transportation processes have received extensive attention. However, due to the unique physical properties of liquid carbon dioxide, especially at the construction site of liquid carbon dioxide fracturing for rock breaking, there is still no better solution for its preparation, storage, and transportation.

[0003] Regarding the preparation and transportation of liquid carbon dioxide, gaseous carbon dioxide is currently mostly used to prepare liquid carbon dioxide. The commonly used methods mainly include normal temperature and high pressure liquefaction and low temperature and low pressure liquefaction. The normal temperature and high pressure liquefaction method has a simple system, saves energy, and has low operating costs. However, it has high requirements for the pressure resistance of equipment and a large risk factor. The corresponding transportation and storage processes mainly use steel cylinders. Calculated based on an annual output of 1×104t of liquid CO2, 1200 steel cylinders are required for storage and transportation. The price of each liquid CO2 storage tank is 1.5 million yuan, and the annual cost of steel cylinders is 180 million yuan. A set of normal temperature and high pressure liquefaction equipment costs 20 million yuan. In addition, the weight of the steel cylinder itself is three times the mass of the loaded liquid CO2, and the transportation efficiency is extremely disproportionate to the transportation cost. The low temperature and low pressure liquefaction reduces the requirements for the pressure resistance of equipment compared with the normal temperature and high pressure liquefaction, and has high safety. However, its operating cost is high and the system is complex. The corresponding transportation method is pipeline transportation. During transportation, part of the liquid CO2 gasifies under the influence of the external environment, increasing the risk.

[0004] In the application field of liquid carbon dioxide fracturing for rock breaking, the on-site environment is relatively complex and the terrain is variable, which has a great impact on the transportation, storage, and storage of liquid carbon dioxide. The demand for liquid carbon dioxide at the construction site is relatively large. Therefore, it is very inconvenient to rely on steel cylinders for storage and transportation of liquid carbon dioxide, and storing liquid carbon dioxide under high pressure in steel cylinders has great potential safety hazards. In the prior art, there is no equipment for on-site preparation of liquid carbon dioxide. The use process of liquid carbon dioxide is often accompanied by long-distance transportation and long-term storage of liquid carbon dioxide under high pressure, resulting in great resource consumption and potential safety hazards. Summary of the Invention

[0005] The object of the present invention is: This application discloses a rapid liquefaction, pressurization and transportation system for dry ice. During the storage and transportation processes, solid dry ice is used instead of liquid carbon dioxide, and liquid carbon dioxide is rapidly prepared on-site for supply and use, reducing logistics costs and eliminating potential safety hazards.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A rapid liquefaction, pressurization and transportation system for dry ice, comprising a dry ice raw material cylinder, a dry ice automatic feeding device, a liquid carbon dioxide outlet valve, a heating and heat preservation jacket layer, a high-pressure piston container, a temperature and pressure sensor, a two-way hydraulic cylinder, and a high-pressure hydraulic station;

[0008] The top of the dry ice raw material cylinder is open for feeding dry ice raw materials, and the bottom of the dry ice raw material cylinder is connected to the dry ice automatic feeding device through a pipeline; the other end of the dry ice automatic feeding device is connected to the high-pressure piston container through a pipeline, and a hydraulic device is connected to the side wall of the dry ice automatic feeding device; the high-pressure piston container makes reciprocating up and down movements under the control of the two-way hydraulic cylinder; the two-way hydraulic cylinder is connected to the high-pressure hydraulic station through an oil injection pipe and is controlled by the high-pressure hydraulic station, and a temperature and pressure sensor is externally connected to the two-way hydraulic cylinder; the high-pressure hydraulic station supplies oil or discharges oil to the two-way hydraulic cylinder, the high-pressure hydraulic station is connected to an oil tank, the oil tank contains hydraulic oil, and an overflow valve is provided on the pipeline between the oil tank and the high-pressure hydraulic station to adjust the filling pressure.

[0009] The high-pressure two-way hydraulic cylinder is connected to the high-pressure piston container, and the up and down movement of the piston is controlled by oil supply and oil discharge (the piston is connected to the two-way hydraulic cylinder). The two-way hydraulic cylinder and the high-pressure piston container are used as two cavities, separated by the piston. When the volume of the two-way hydraulic cylinder 7 increases, the volume of the high-pressure piston container is compressed and becomes smaller, and the fluid in the high-pressure piston container is discharged from the container.

[0010] Preferably, the material of the dry ice raw material cylinder is double-layer 304 stainless steel with vacuum extraction, achieving the functions of heat insulation and heat preservation. The top can be opened to feed dry ice raw materials, and the heat preservation effect is better after closing. The lower part of the dry ice raw material cylinder is connected to a pipe fitting and connected to the dry ice automatic feeding device, and the dry ice in the dry ice raw material cylinder falls into the dry ice automatic feeding device through the pipe fitting.

[0011] A hydraulic oil injection pipe is provided on the side wall of the dry ice automatic feeding device, and the hydraulic oil injection pipe is connected to the hydraulic device;

[0012] The bottom of the disc slopes downward and has a raised cylindrical block. There is a recessed retaining disc at the lower part of the feeding device, with a retaining disc through-hole in the middle that is equal in diameter to the raised cylindrical block. The disc and the retaining disc can make a hard contact to block the falling of dry ice particles. There is a through disc through-hole on the disc, and the raised cylindrical block fits with the retaining disc through-hole to control the stopping of the dry ice particles from falling through hard contact. The disc 10 of the dry ice automatic feeding device rises or falls through hydraulic control, realizing the separation or contact of the raised cylindrical block and the retaining disc through-hole, completing the penetration or isolation of the upper and lower spaces of the disc, and realizing the automatic feeding or stopping of dry ice. Among them, the contact between the raised cylindrical block and the retaining disc through-hole is the closed state of the feeding device, and the separation between the raised cylindrical block and the retaining disc through-hole is the open state of the feeding device.

[0013] The hydraulic device includes a hydraulic cylinder, which is used to control the up and down movement of the block where the disc, the disc through-hole and the raised cylindrical block are located. That is to say, the hydraulic device controls the lifting of the disc by pumping and injecting oil, so that the raised cylindrical block is separated from or contacts the retaining disc through-hole, realizing the closing or opening of the dry ice feeding device. It is closed when in contact and open when separated.

[0014] Preferably, the bottom of the disc is conical and the retaining disc is conical.

[0015] The high-pressure piston container is made of 304 stainless steel. A perfluoroether carbon dioxide-resistant O-ring is equipped at the edge of the high-pressure piston container, which is wear-resistant and can be used for a long time, and has good heat conduction performance for heat exchange with the external heating and heat preservation jacket layer. When the dry ice automatic feeding device is opened, the piston connected to the double-acting hydraulic cylinder moves downward, and dry ice is fed into the high-pressure piston container through the automatic feeding device. The heating and heat preservation jacket layer turns on the heating function, and the solid dry ice absorbs heat and melts into carbon dioxide in a gas-liquid coexistence form. After the heating process ends, the piston moves upward, and the liquid carbon dioxide outlet valve is opened to push the liquid carbon dioxide out through the liquid carbon dioxide outlet valve.

[0016] The heating and heat preservation jacket layer is wrapped outside the high-pressure piston container and can have good heat exchange with the inside of the piston container.

[0017] Preferably, the high-pressure hydraulic station and the double-acting hydraulic cylinder are auxiliary equipment for the high-pressure piston container. The high-pressure hydraulic station supplies oil to the double-acting hydraulic cylinder, and the double-acting hydraulic cylinder pushes the piston (the double-acting hydraulic cylinder moves upward to transport the prepared liquid carbon dioxide out, and then moves downward to have a cavity to receive dry ice) to move, and can automatically reverse.

[0018] Furthermore, the double-acting hydraulic cylinder is equipped with a magnetostrictive displacement sensor, which can accurately detect the piston stroke to realize automatic reverse operation;

[0019] This dry ice rapid liquefaction, pressurization and transportation system uses dry ice as raw material to prepare liquid carbon dioxide, avoiding the long-distance transportation and high-pressure storage of liquid carbon dioxide, and can rapidly prepare the required liquid carbon dioxide at the construction site.

[0020] The fuel tank of the high-pressure hydraulic station is made of steel plate, and an overflow valve is provided in the high-pressure hydraulic station to adjust the filling pressure.

[0021] The double-acting hydraulic cylinder is provided with a magnetostrictive displacement sensor to accurately detect the piston stroke, so as to realize automatic commutation operation.

[0022] The heating and heat preservation jacket layer is a flexible heating jacket.

[0023] A dry ice rapid liquefaction, pressurization and transportation method, based on the above dry ice rapid liquefaction, pressurization and transportation system for dry ice liquefaction, pressurization and transportation, includes the following steps:

[0024] Step 1: Remotely control the hydraulic device connected to the dry ice automatic feeding device to work. The disc of the dry ice automatic feeding device descends through oil pressure control, so that the convex cylindrical block contacts the through hole of the retaining disc, set the dry ice automatic feeding device to the closed state, and the liquid carbon dioxide valve is closed;

[0025] Step 2: Open the dry ice raw material cylinder and add dry ice particles or powder;

[0026] Step 3: Remotely control the hydraulic device connected to the dry ice automatic feeding device to work. The disc of the dry ice automatic feeding device rises through oil pressure control, so that the convex cylindrical block is separated from the through hole of the retaining disc, turn on the dry ice automatic feeding device, the high-pressure hydraulic station starts to work, supply oil to the double-acting hydraulic cylinder, and the double-acting hydraulic cylinder drives the piston to move downward, so that the dry ice raw material enters the high-pressure piston container;

[0027] Step 4: Judge the amount of dry ice entering the high-pressure piston container by the change of the dry ice amount in the dry ice raw material cylinder. When the set dry ice amount is reached, the double-acting hydraulic cylinder controls the dry ice automatic feeding device to close;

[0028] Step 5: The heating function of the heating and heat preservation jacket layer starts to work, and the indication of the temperature and pressure sensor starts to change. Judge the degree of dry ice liquefaction by the temperature and pressure values. After the dry ice liquefaction is completed, control the heating function of the heating and heat preservation jacket layer to end, and the heat preservation function continues;

[0029] Step 6: The high-pressure hydraulic station supplies oil in the reverse direction, the double-acting hydraulic cylinder commutes and runs, the piston moves upward, the liquid carbon dioxide outlet valve opens, and pushes the liquid carbon dioxide out of the high-pressure piston container;

[0030] Step 7: When the magnetostrictive displacement sensor in the double-acting hydraulic cylinder detects that the piston reaches the top, the liquid carbon dioxide outlet valve closes, and repeat steps 3 to 7 until the preparation of liquid carbon dioxide is completed.

[0031] Through the above steps, dry ice is used as a raw material to prepare liquid carbon dioxide, avoiding the long-distance transportation and storage of liquid carbon dioxide, and greatly improving the use efficiency and safety.

[0032] The beneficial effects of the present invention are as follows: 1. The dry ice rapid liquefaction and pressurization transportation system of the present invention is safe, convenient and simple to operate, and can safely and efficiently prepare liquid carbon dioxide; 2. The invention of the dry ice rapid liquefaction and pressurization transportation system uses dry ice as a raw material to prepare liquid carbon dioxide. The transportation process of dry ice is safe and low-cost, effectively avoiding the long-distance transportation and storage of liquid carbon dioxide, saving logistics costs and reducing potential safety hazards; 3. The device of the dry ice rapid liquefaction and pressurization transportation system of the present invention is simple and easy to install. It can start to prepare a large amount of liquid carbon dioxide after being installed at the construction site; 4. The existence of the dry ice automatic feeding device, high-pressure hydraulic station and high-pressure double-acting hydraulic cylinder in the dry ice rapid liquefaction and pressurization transportation system of the present invention ensures the mechanization and automation of the system, avoids human interference, saves manpower and improves the accuracy and safety of the system at the same time. Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the overall structure of a dry ice rapid liquefaction and pressurization transportation system of the present invention;

[0034] Figure 2 It is a schematic diagram of the opening of the dry ice automatic feeding device in a dry ice rapid liquefaction and pressurization transportation system of the present invention;

[0035] Figure 3 It is a schematic diagram of the closing of the dry ice automatic feeding device in a dry ice rapid liquefaction and pressurization transportation system of the present invention;

[0036] Reference numerals: 1, dry ice raw material cylinder; 2, dry ice automatic feeding device; 3, liquid carbon dioxide outlet valve; 4, heating and heat preservation jacket layer; 5, high-pressure piston container; 6, temperature and pressure sensor; 7, double-acting hydraulic cylinder; 8, high-pressure hydraulic station; 9, hydraulic injection oil pipe; 10, disc; 11, disc through hole; 12, convex cylindrical block; 13, retaining disc, 14, retaining disc through hole; 15, piston; 16, hydraulic device; 17, overflow valve; 18, fuel tank. Detailed Embodiments

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will describe the detailed embodiments of the present invention with reference to the drawings.

[0038] The following will clearly and completely describe and discuss the technical solutions in the embodiments of the present invention in combination with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all of the examples. All other examples obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the protection scope of the present invention.

[0039] As Figure 1 shown, this embodiment discloses a rapid liquefaction and pressurization transportation system for dry ice in China, including a dry ice raw material cylinder 1, a dry ice automatic feeding device 2, a liquid carbon dioxide outlet valve 3, a heating and heat preservation jacket layer 4, a high-pressure piston container 5, a temperature and pressure sensor 6, a two-way hydraulic cylinder 7, and a high-pressure hydraulic station 8;

[0040] The top of the dry ice raw material cylinder 1 is open for feeding dry ice raw materials, and the bottom of the dry ice raw material cylinder 1 is connected to the dry ice automatic feeding device 2 through a pipeline; the other end of the dry ice automatic feeding device 2 is connected to the high-pressure piston container 5 through a pipeline, and a hydraulic device 16 is connected to the side wall of the dry ice automatic feeding device 2; the high-pressure piston container 5 makes reciprocating up and down movements through the control of the piston of the two-way hydraulic cylinder 7; the two-way hydraulic cylinder 7 is connected to the high-pressure hydraulic station 8 through an oil injection pipe and is controlled by the high-pressure hydraulic station 8, and a temperature and pressure sensor 6 is connected to the outside of the two-way hydraulic cylinder 7; the high-pressure hydraulic station 8 supplies oil or discharges oil to the two-way hydraulic cylinder 7, the high-pressure hydraulic station 8 is connected to an oil tank 18, the oil tank 18 made of steel plates contains test oil, and an overflow valve 17 is provided on the pipeline between the oil tank 18 and the high-pressure hydraulic station 8 to adjust the filling pressure.

[0041] The high-pressure two-way hydraulic cylinder 7 is connected to the high-pressure piston container 5, and the up and down movement of the piston is controlled by supplying oil and discharging oil (the piston is connected to the two-way hydraulic cylinder 7). The two-way hydraulic cylinder 7 and the high-pressure piston container 5 are used as two cavities, separated by the piston. When the volume of the two-way hydraulic cylinder 7 increases, the volume of the high-pressure piston container 5 is compressed and becomes smaller, and the fluid in the high-pressure piston container 5 is discharged from the container.

[0042] The oil supply and discharge use hydraulic oil (#46) of a general hydraulic press. The two-way hydraulic cylinder 7 controls the movement of the piston through a special pipeline, and there is no need to consider the problem of hydraulic oil leakage.

[0043] The dry ice raw material cylinder 1 is made of double-layer 304 stainless steel with a vacuum in the middle, having good heat preservation effect. Its top is open for feeding dry ice particles or powder raw materials, and its bottom is connected to the dry ice automatic feeding device 2 through a pipeline;

[0044] The hydraulic device 16 includes a hydraulic cylinder, as shown in the attached drawings of the specification Figure 2 、 3As shown in the figure, it is used to control the up and down movement of the block where the disc 10, the through hole 11 of the disc and the convex cylindrical block 12 are located; that is, the hydraulic device 16 controls the lifting of the disc 10 by pumping and injecting oil, so that the convex cylindrical block 12 is separated from or in contact with the through hole 14 of the retaining disc, realizing the closing or opening of the dry ice feeding device. It is closed when in contact and opened when separated.

[0045] The material of the dry ice automatic feeding device 2 is 304 stainless steel. Inside the dry ice automatic feeding device 2, there is a disc 10 that can move up and down (the disc 10 is the hydraulic propulsion system of the dry ice automatic feeding device 2). In the middle of the dry ice automatic feeding device 2, there is a hydraulic oil injection pipe 9 connected to the hydraulic device 16. The disc 10 moves by the hydraulic device 16 pumping and injecting oil through the hydraulic oil injection pipe 9.

[0046] Inside the dry ice automatic feeding device 2, there is a disc 10 that can slide up and down. In the middle, there is a hydraulic oil injection pipe 9 connected to the hydraulic device 16. The disc 10 moves by the hydraulic cylinder of the hydraulic device 16 supplying and pumping oil through the hydraulic oil injection pipe 9. The bottom of the disc 10 is conical, and there is a convex cylindrical block 12 in the middle. At the lower part of the feeding device, there is a concave conical retaining disc 13. The retaining disc 13 is conical, and there is a through hole 14 of the retaining disc in the middle with the same diameter as the convex cylindrical block 12. The disc 10 and the retaining disc 13 can be in hard contact to block the falling of dry ice particles. There are three through holes 11 in the disc 10 for dry ice particles to pass through. The bottom of the disc 10 is inclined and the convex cylindrical block 12 fits with the inclined and concave parts of the bottom surface of the dry ice automatic feeding device 2. The falling of dry ice particles is controlled to stop through hard contact. The disc 10 of the dry ice automatic feeding device 2 is controlled by oil pressure to complete automatic rising and falling, realizing the contact and separation between the convex cylindrical block 12 and the through hole 14 of the retaining disc, thereby completing the isolation or penetration of the upper and lower spaces of the disc 10, and realizing the automatic feeding and stopping of dry ice. Among them, the contact between the convex cylindrical block 12 and the through hole 14 of the retaining disc is the closed state of the feeding device, and the separation between the convex cylindrical block 12 and the through hole 14 of the retaining disc is the open state of the feeding device. When the disc 10 moves upward and separates from the retaining disc 13, the feeding device is opened, and the dry ice inside passes through the three through holes 11 and then through the through hole 14 of the retaining disc and falls into the high-pressure piston container 5. When the disc 10 moves downward and the convex cylindrical block 12 is in contact with the through hole 14 of the retaining disc, the feeding device is closed, the dry ice stays in the feeding device 2, and the dry ice in the raw material cylinder 1 no longer falls.

[0047] In this embodiment, the high-pressure piston container 5 is made of a single layer of 304 stainless steel, has good heat conduction performance, and is equipped with a perfluoroether carbon dioxide-resistant O-ring inside, which can be used for a long time. The top is connected to the dry ice automatic feeding device 2, and the internal piston 15 is controlled by the high-pressure hydraulic station 8 and the double-acting hydraulic cylinder 7 to move. After the dry ice automatic feeding device 2 is opened, the high-pressure hydraulic station 8 and the double-acting hydraulic cylinder 7 start to operate, driving the piston 15 to move downward until it reaches the bottom of the container. When a certain amount of dry ice is reached in the high-pressure piston container 5, the dry ice automatic feeding device 2 is closed, and at the same time, the heating and insulation jacket layer 4 starts to work. After the dry ice liquefaction is completed, the liquid carbon dioxide outlet valve 3 is opened, and the high-pressure hydraulic station 8 and the double-acting hydraulic cylinder 7 drive the piston 15 to move upward to transport the liquid carbon dioxide to the outside.

[0048] In this embodiment, the heating and insulation jacket layer 4 is a flexible heating jacket, which has the functions of heat preservation and heating. The heating power is 4 kw, and the temperature control range is between normal temperature and 150 °C. It is wrapped outside the high-pressure piston container 5 and has good heat exchange with it.

[0049] The high-pressure hydraulic station 8 uses an oil tank made of steel plates to hold the test oil, and is equipped with an overflow valve to adjust the filling pressure, and supplies oil to the double-acting hydraulic cylinder 7 bidirectionally to make the test oil circulate. In this embodiment, the working pressure of the high-pressure hydraulic station 8 is 25 MPa and the displacement is 20 L / min.

[0050] In this embodiment, the double-acting hydraulic cylinder 7 has a maximum load of 30 tons, a stroke of 500 mm, and a maximum working pressure of 25 MPa. It is equipped with a magnetostrictive displacement sensor to accurately detect the stroke of the piston 15, so as to realize automatic commutation operation.

[0051] The temperature and pressure sensor is a temperature sensor and a pressure sensor. In this embodiment, the temperature sensor is a PT100 type temperature sensor with a measuring range of -50 to 200 °C and a test accuracy of ±0.1 °C. The pressure is measured by the catheter drainage method. The internal pressure of the model is led out to the external pressure sensor through the pipeline. The measuring range of the pressure sensor is 20 MPa and the accuracy is 0.25%.

[0052] This dry ice rapid liquefaction and pressurization transportation system uses the heating method to prepare liquid carbon dioxide with dry ice, which can be prepared on-site at construction sites such as liquid carbon dioxide fracturing, avoiding the high-pressure transportation and storage of liquid carbon dioxide, and greatly improving the construction efficiency and safety.

[0053] A dry ice rapid liquefaction and pressurization transportation method, based on the above dry ice rapid liquefaction and pressurization transportation system for dry ice liquefaction and pressurization transportation, includes the following steps:

[0054] Step 1: Remotely control the hydraulic device 16 connected to the dry ice automatic feeding device 2 to work (as shown in the attached Figure 2 、 3), the disc 10 of the dry ice automatic feeding device 2 is lowered by hydraulic control to achieve the contact between the convex cylindrical block 12 and the through hole 14 of the retaining disc, and the dry ice automatic feeding device 2 is set to the closed state, and the liquid carbon dioxide valve 3 is closed;

[0055] Step 2: Open the dry ice raw material cylinder 1 and add dry ice particles or powder;

[0056] Step 3: Remotely control the hydraulic device 16 connected to the dry ice automatic feeding device 2 to work (as shown in the attached Figure 2 , 3 ), the disc 10 of the dry ice automatic feeding device 2 is raised by hydraulic control to separate the convex cylindrical block 12 from the through hole 14 of the dry ice automatic feeding retaining disc, the dry ice automatic feeding device 2 is opened, and the high-pressure hydraulic station 8 starts to work, supplying oil to the double-acting hydraulic cylinder 7, and the double-acting hydraulic cylinder 7 drives the piston to move downward, so that the dry ice raw material enters the high-pressure piston container 5;

[0057] Step 4: Judge the amount of dry ice entering the high-pressure piston container by the change of the dry ice amount in the dry ice raw material cylinder 1. When the set dry ice amount is reached, the double-acting hydraulic cylinder 7 controls the dry ice automatic feeding device 2 to close;

[0058] Step 5: The heating function of the heating insulation layer 4 starts to work, and the reading of the temperature and pressure sensor 6 starts to change. Judge the degree of dry ice liquefaction by the temperature and pressure values. After the dry ice liquefaction is completed, control the heating function of the heating insulation layer 4 to end, and the heat preservation function continues;

[0059] Step 6: The high-pressure hydraulic station 8 supplies oil in the reverse direction, the double-acting hydraulic cylinder 7 runs in the reverse direction, the piston moves upward, and the liquid carbon dioxide outlet valve 3 is opened to push the liquid carbon dioxide out of the high-pressure piston container 5.

[0060] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0061] Similarly, it should be understood that, for the purpose of streamlining the present disclosure and aiding in the understanding of one or more of the various inventive aspects, in the foregoing description of the exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, the disclosed method should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims, the inventive aspects lie in less than all of the features of the single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate embodiment of the present invention.

[0062] Those skilled in the art should understand that the modules or units or groups of the devices in the examples disclosed herein can be arranged in the devices as described in this embodiment, or alternatively can be located in one or more devices different from the devices in this example. The modules in the foregoing examples can be combined into one module or further divided into multiple sub-modules.

[0063] Those skilled in the art can understand that the modules in the devices of the embodiments can be adaptively changed and arranged in one or more devices different from this embodiment. The modules or units or groups in the embodiments can be combined into one module or unit or group, and furthermore can be divided into multiple sub-modules or sub-units or sub-groups. Except that at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all the features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all the processes or units of any method or device so disclosed. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) can be replaced by an alternative feature that provides the same, equivalent, or similar purpose.

[0064] In addition, those skilled in the art can understand that, although some of the embodiments described herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present invention and forms different embodiments. For example, in the following claims, any one of the claimed embodiments can be used in any combination.

[0065] In addition, some of the embodiments described herein are described as methods or combinations of method elements that can be implemented by a processor of a computer system or by other devices performing the functions. Accordingly, a processor having the necessary instructions for implementing the method or method element forms a means for implementing the method or method element. In addition, the elements described herein of the apparatus embodiments are examples of apparatus for performing the functions performed by the elements for the purpose of implementing the invention.

[0066] The various techniques described herein can be implemented in conjunction with hardware or software, or a combination thereof. Thus, the methods and apparatus of the present invention, or certain aspects or portions of the methods and apparatus of the present invention, may take the form of program code (i.e., instructions) embedded in a tangible medium, such as a floppy disk, CD-ROM, hard disk drive, or any other machine-readable storage medium, where, when the program is loaded into and executed by a machine such as a computer, the machine becomes an apparatus for practicing the present invention.

[0067] In the case where the program code is executed on a programmable computer, the computing device generally includes a processor, a processor-readable storage medium (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device. Among them, the memory is configured to store the program code; the processor is configured to execute the method of the present invention according to the instructions in the program code stored in the memory.

[0068] By way of example and not limitation, computer-readable media include computer storage media and communication media. Computer-readable media include computer storage media and communication media. Computer storage media stores information such as computer-readable instructions, data structures, program modules, or other data. Communication media generally embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and includes any information delivery media. A combination of any of the above is also included within the scope of computer-readable media.

[0069] As used herein, unless otherwise specified, the use of ordinal numbers "first", "second", "third", etc. to describe ordinary objects merely indicates different instances of similar objects and is not intended to imply that the objects so described must have a given order in terms of time, space, ranking, or in any other manner.

[0070] Although the present invention has been described in terms of a limited number of embodiments, those skilled in the art, having the benefit of the foregoing description, will appreciate that other embodiments can be contemplated within the scope of the invention as thus described. Further, it should be noted that the language used in this specification has been principally selected for readability and instructional purposes and not to limit or define the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. For the scope of the present invention, the disclosure herein is illustrative, and not restrictive, the scope of the invention being defined by the appended claims.

[0071] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A rapid liquefaction, pressurization and conveying system for dry ice, characterized in that, It includes a dry ice raw material cylinder (1), a dry ice automatic feeding device (2), a liquid carbon dioxide outlet valve (3), a heating and heat preservation jacket layer (4), a high-pressure piston container (5), a temperature and pressure sensor (6), a double-acting hydraulic cylinder (7), and a high-pressure hydraulic station (8); The top of the dry ice raw material cylinder (1) is open for feeding dry ice raw materials, and the bottom of the dry ice raw material cylinder (1) is connected to the dry ice automatic feeding device (2) through a pipeline; the other end of the dry ice automatic feeding device (2) is connected to the high-pressure piston container (5) through a pipeline, and the side wall of the dry ice automatic feeding device (2) is connected with a hydraulic device (16); the high-pressure piston container (5) makes a reciprocating up and down movement controlled by the piston of the double-acting hydraulic cylinder (7); the double-acting hydraulic cylinder (7) is connected to the high-pressure hydraulic station (8) and is controlled by the high-pressure hydraulic station (8), and a temperature and pressure sensor (6) is externally connected to the double-acting hydraulic cylinder (7); the high-pressure hydraulic station (8) is connected to an oil tank (18), and the oil tank (18) is used for storing hydraulic oil; The heating and heat preservation jacket layer (4) is wrapped outside the high-pressure piston container (5); Inside the dry ice automatic feeding device (2), there is a disk (10) that can move up and down. A hydraulic oil injection pipe (9) is provided on the middle side wall of the dry ice automatic feeding device (2), and the hydraulic oil injection pipe (9) is connected to the hydraulic device (16). The disk (10) moves based on the hydraulic device (16) supplying or pumping oil through the hydraulic oil injection pipe (9); The bottom of the disk (10) slopes downward and has a protruding cylindrical block (12). There is a concave retaining disk (13) at the lower part of the feeding device, and a retaining disk through hole (14) with the same diameter as the protruding cylindrical block (12) is left in the middle. The disk (10) and the retaining disk (13) can fit and make hard contact to block the falling of dry ice particles. A through disk through hole (11) is provided on the disk (10), and the protruding cylindrical block (12) fits with the retaining disk through hole (14). The falling of dry ice particles is stopped by hard contact. The disk (10) of the dry ice automatic feeding device (2) rises or falls through oil pressure control, realizing the separation or contact of the protruding cylindrical block (12) and the retaining disk through hole (14), completing the penetration or isolation of the upper and lower spaces of the disk (10), and realizing the automatic feeding or stopping of dry ice; When the dry ice automatic feeding device (2) is opened, the piston connected to the double-acting hydraulic cylinder (7) moves downward, and dry ice is fed into the high-pressure piston container (5) through the automatic feeding device (2); The heating and heat preservation jacket layer (4) turns on the heating function, and solid dry ice absorbs heat and melts into carbon dioxide in a gas-liquid coexistence form; after the heating process ends, the piston moves upward, the liquid carbon dioxide outlet valve opens, and the liquid carbon dioxide is pushed out through the liquid carbon dioxide outlet valve (3); The material of the oil tank (18) is steel plate, and an overflow valve (17) is provided in the high-pressure hydraulic station (8) to adjust the filling pressure.

2. The rapid liquefaction, pressurization and conveying system for dry ice according to claim 1, characterized in that, The bottom of the disk (10) is conical, and the retaining disk (13) is conical.

3. The rapid liquefaction, pressurization and conveying system for dry ice according to claim 1, characterized in that, The material of the high-pressure piston container (5) is 304 stainless steel, and the high-pressure piston container (5) is equipped with a perfluoroether carbon dioxide-resistant O-ring.

4. The rapid liquefaction, pressurization and conveying system for dry ice according to claim 1, characterized in that, The dry ice raw material cylinder (1) is made of double-layer 304 stainless steel with vacuum pumping.

5. The rapid liquefaction, pressurization and conveying system for dry ice according to claim 1, characterized in that, The double-acting hydraulic cylinder (7) is provided with a magnetostrictive displacement sensor.

6. The rapid liquefaction, pressurization and conveying system for dry ice according to claim 1, characterized in that, The heating and heat preservation jacket layer (4) is a flexible heating jacket.

7. A rapid liquefaction, pressurization and conveying method for dry ice, characterized in that, Based on the dry ice rapid liquefaction, pressurization and transportation system according to any one of claims 1 to 6, for dry ice liquefaction, pressurization and transportation, the following steps are included: Step 1: Remotely control the hydraulic device (16) connected to the dry ice automatic feeding device (2) to work. The disc (10) of the dry ice automatic feeding device (2) descends through oil pressure control, so that the convex cylindrical block (12) contacts the through hole of the baffle plate (14), and the dry ice automatic feeding device (2) is set to the closed state, and the liquid carbon dioxide outlet valve (3) is closed; Step 2: Open the dry ice raw material cylinder (1) and add dry ice particles or powder; Step 3: Remotely control the hydraulic device (16) connected to the dry ice automatic feeding device (2) to work. The disc (10) of the dry ice automatic feeding device (2) ascends through oil pressure control, so that the convex cylindrical block (12) is separated from the through hole of the baffle plate (14), the dry ice automatic feeding device (2) is opened, the high-pressure hydraulic station (8) starts to work, supplies oil to the double-acting hydraulic cylinder (7), and the double-acting hydraulic cylinder (7) drives the piston to move downward, so that the dry ice raw material enters the high-pressure piston container (5); Step 4: Judge the amount of dry ice entering the high-pressure piston container according to the change of the amount of dry ice in the dry ice raw material cylinder (1). When the set amount of dry ice is reached, the double-acting hydraulic cylinder (7) controls the dry ice automatic feeding device (2) to close; Step 5: The heating function of the heating and heat preservation jacket layer (4) starts to work, and the reading of the temperature and pressure sensor (6) starts to change. Judge the degree of dry ice liquefaction according to the temperature and pressure values. After the dry ice liquefaction ends, control the heating function of the heating and heat preservation jacket layer (4) to end, and the heat preservation function continues; Step 6: The high-pressure hydraulic station (8) supplies oil in the reverse direction, the double-acting hydraulic cylinder (7) runs in the reverse direction, the piston moves upward, the liquid carbon dioxide outlet valve (3) is opened, and the liquid carbon dioxide is pushed out of the high-pressure piston container (5); Step 7: When the magnetostrictive displacement sensor in the double-acting hydraulic cylinder (7) detects that the piston reaches the top, the liquid carbon dioxide outlet valve (3) is closed, and repeat steps 3 to 7 until the preparation of liquid carbon dioxide ends.

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