A pressurization device for utilizing the cold energy of liquefied gas

Abstract

The present invention discloses a pressurization device for utilizing the cold energy of liquefied gas. The pressurization device for utilizing the cold energy of liquefied gas includes a pressurization part, a heat exchange pipeline, and a pressurization driving part. Among them, the pressurization part includes a pressurization cylinder liner, a pressurization piston clamped in the pressurization cylinder liner, and a first space and a second space separated by the pressurization piston. The first space is communicated with a pipeline for supplying liquefied gas to be pressurized. The heat exchange pipeline includes an outflow pipeline and a return pipeline. One end of the outflow pipeline is communicated with the first space, and the other end is communicated with the second space. One end of the return pipeline is communicated with the first space, and the other end is communicated with the second space. Heat exchange devices are arranged on both the outflow pipeline and the return pipeline. The pressurization driving part is drivingly connected to the pressurization piston to drive the pressurization piston to reciprocate in the direction from the first space to the second space. The present invention can utilize the cold energy of natural gas for endothermic pressurization to obtain high-pressure NG for users, reduce the energy consumption of pumping out high-pressure natural gas, and save energy.

Description

Technical Field

[0001] The present invention relates to the technical field of liquefied gas carriers, and particularly to a liquefied gas cold energy utilization pressurizing device. Background Art

[0002] Most existing dual-fuel ships use natural gas as a clean fuel. During the transportation or storage of natural gas as fuel, it always presents in the form of cryogenic liquid. When liquefied natural gas (LNG) is used by the main engine or generator, it needs to be pressurized to a relatively high pressure and heated to a certain temperature to meet the usage conditions of users.

[0003] In order to make liquefied natural gas meet the pressure requirements of users, a set of booster pumps needs to be equipped for the fuel supply system. Existing dual-fuel supply systems usually use electrically driven cryogenic deep-well pumps, which can pump the fuel in the fuel tank and meet the usage requirements of users. However, such pumps are large in size and consume a certain amount of energy. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a liquefied gas cold energy utilization pressurizing device to achieve pressurization by utilizing the cold energy of LNG and reduce energy consumption.

[0005] To achieve the above purpose and other related purposes, the present invention provides a liquefied gas cold energy utilization pressurizing device, including:

[0006] A pressurizing part, including a pressurizing cylinder liner, a pressurizing piston clamped in the pressurizing cylinder liner, and a first space and a second space separated by the pressurizing piston. The first space is communicated with the liquefied gas supply pipeline to be pressurized;

[0007] A heat exchange pipeline, including an outflow pipeline and a return pipeline. One end of the outflow pipeline is communicated with the first space, and the other end is communicated with the second space. The outflow pipeline allows communication in the direction from the first space to the second space; one end of the return pipeline is communicated with the first space, and the other end is communicated with the second space. The return pipeline allows communication in the direction from the second space to the first space. Heat exchange devices are provided on both the outflow pipeline and the return pipeline;

[0008] A pressurizing drive part, which is drivingly connected to the pressurizing piston to drive the pressurizing piston to reciprocate in the direction from the first space to the second space.

[0009] Optionally, the heat exchange device includes a first heat exchange device and a second heat exchange device. The first heat exchange device is arranged on the outflow pipeline, and the second heat exchange device is arranged on the return pipeline.

[0010] Optionally, the heat exchange pipeline further includes a first common pipeline and a second common pipeline. One end of the first common pipeline is communicated with the first space, and the other end is communicated with one end of the outflow pipeline, forming a part of the outflow pipeline; the other end of the first common pipeline is also communicated with one end of the return pipeline, forming a part of the return pipeline; one end of the second common pipeline is communicated with the second space, and the other end is connected to the other end of the outflow pipeline, forming a part of the outflow pipeline; at the same time, the second common pipeline is also communicated with the other end of the return pipeline, forming a part of the return pipeline.

[0011] Optionally, a first one-way valve is provided on the outflow pipeline. The first one-way valve is arranged behind the heat exchange device in the direction from the first common pipeline to the second common pipeline, and the first one-way valve controls the on-off of the outflow pipeline in the direction from the first common pipeline to the second common pipeline.

[0012] Optionally, a second one-way valve is provided on the return pipeline. The second one-way valve controls the on-off of the return pipeline in the direction from the second common pipeline to the first common pipeline.

[0013] Optionally, the heat exchange device includes a first heat exchange device, and the first heat exchange device is a regenerator. The regenerator is arranged on the first common pipeline.

[0014] Optionally, the heat exchange device further includes a second heat exchange device. The second heat exchange device is a heat exchanger. The heat exchanger includes a first pipeline and a second pipeline. A normal temperature medium is introduced into the first pipeline, and the second pipeline is communicated with the outflow pipeline.

[0015] Optionally, the boosting drive part includes:

[0016] A driving cylinder;

[0017] A driving piston, which is clamped in the driving cylinder, and the driving piston separates the driving cylinder to form a third space and a fourth space. The driving piston is drivingly connected to the boosting piston;

[0018] A two-position four-way valve, including a first interface, a second interface, a third interface, a fourth interface and an in-valve adjusting rod. The third interface is communicated with the third space, the second interface is communicated with the fourth space, and the in-valve adjusting rod is drivingly connected to the driving piston;

[0019] A pressure storage container, which is communicated with the second space, is unidirectionally communicated in the direction from the second space to the pressure storage container, and is communicated with the first interface;

[0020] A pressure regulating container, which is communicated with the fourth interface and is communicated with the pressure storage container.

[0021] Optionally, the boosting drive part further includes:

[0022] The connecting rod is fixedly connected to the adjusting rod inside the valve, and a first clamping portion and a second clamping portion are provided on the connecting rod;

[0023] The clamping structure is arranged at one end of the driving piston close to the connecting rod, and the clamping structure is between the first clamping portion and the second clamping portion. When the driving piston moves to the limit position towards the third space, the clamping structure is clamped with the first clamping portion and simultaneously drives the adjusting rod inside the valve to move towards the driving piston; when the driving piston moves to the limit position towards the fourth space, the clamping structure is clamped with the second clamping portion and simultaneously drives the adjusting rod inside the valve to move away from the driving piston.

[0024] Optionally, a third one-way valve is provided on the connecting pipeline between the second space and the pressure storage container.

[0025] Optionally, a regulating valve is provided on the connecting pipeline between the pressure storage container and the pressure regulating container.

[0026] Optionally, the pressure value in the pressure storage container is greater than the pressure value in the pressure regulating container.

[0027] Compared with the prior art, the liquefied gas cold energy utilization pressurizing device of the present invention has at least the following beneficial effects:

[0028] The liquefied gas cold energy utilization pressurizing device of the present invention includes a pressurizing portion, a heat exchange pipeline, and a pressurizing driving portion. Among them, the pressurizing portion includes a pressurizing cylinder sleeve, a pressurizing piston clamped in the pressurizing cylinder sleeve, and a first space and a second space separated by the pressurizing piston. The first space is communicated with the pipeline for supplying liquefied gas to be pressurized. The heat exchange pipeline includes an outflow pipeline and a return pipeline. One end of the outflow pipeline is communicated with the first space, and the other end is communicated with the second space. The outflow pipeline allows communication in the direction from the first space to the second space. One end of the return pipeline is communicated with the first space, and the other end is communicated with the second space. The return pipeline allows communication in the direction from the second space to the first space. Heat exchange devices are provided on both the outflow pipeline and the return pipeline. The pressurizing driving portion is drivingly connected to the pressurizing piston to drive the pressurizing piston to reciprocate in the direction from the first space to the second space. Thus, the pressurizing device of the present invention uses the heat exchange device on the outflow pipeline connecting the first space and the second space to exchange heat with the LNG liquefied gas introduced into the first space and entering the heat exchange pipeline from the first space. The LNG absorbs heat and is pressurized through the heat exchange device. The gas flowing from the second space to the first space through the return pipeline is cooled through the heat exchange device and then enters the first space to be pressurized again. Furthermore, the present invention can utilize the cold energy of natural gas for endothermic pressurization to obtain high-pressure NG for users, reducing the energy consumption of using a fuel pump to pump out high-pressure natural gas and saving energy.

[0029] Further, the present invention feeds the gas pressurized by the pressurizing section and the heat exchange pipeline into a pressure storage container, and the pressurized gas is fed into the pressurizing drive section to provide kinetic energy for the pressurizing drive section, so as to enable the pressurizing device to pressurize, saving energy. Moreover, the present invention drives the drive piston in the pressurizing drive section to move through the pressure difference between the pressure storage container and the pressure regulating container, and adjusts the gas flow direction entering and discharging from the drive cylinder through a two-position four-way valve, realizing the cyclic pressurization of the pressurizing device.

[0030] Further, the pressure storage container is used to store the high-pressure gas after endothermic pressurization, and adjusts the reciprocating movement frequency of the drive cylinder piston through the pressure regulating container, each regulating valve and the two-position four-way valve. The pressurization rate is adjustable and the operation is relatively simple. Description of the Drawings

[0031] Figure 1 Schematic structural diagram of the drive piston moving to the top of the drive cylinder in the liquefied gas cold energy utilization pressurizing device described in the present invention;

[0032] Figure 2 is Figure 1 Enlarged view at A in

[0033] Figure 3 Schematic structural diagram of the drive piston moving downward in the liquefied gas cold energy utilization pressurizing device described in the present invention.

[0034] List of Reference Numerals:

[0035] 1 Check Valve 4 183 Outflow Pipeline

[0036] 2 Pressurizing Cylinder Sleeve 184 Return Pipeline

[0037] 3 Pressurizing Piston 191 First Space

[0038] 4 Regenerator 192 Second Space

[0039] 5 Heat Exchanger 193 Third Space

[0040] 6 First Check Valve 194 Fourth Space

[0041] 7 Second Check Valve a First Interface

[0042] 8 Third Check Valve b Second Interface

[0043] 9 Pressure Storage Container c Third Interface

[0044] 10 Two-Position Four-Way Valve d Fourth Interface

[0045] 11 Valve Inner Adjusting Rod 20 Connecting Rod

[0046] 12 Driving piston 201 First clamping portion

[0047] 13 Driving cylinder 202 Second clamping portion

[0048] 14 First regulating valve 21 Piston rod

[0049] 15 Pressure regulating container 211 Clamping structure

[0050] 16 Second regulating valve 22 Boosting portion

[0051] 17 Third regulating valve 23 Boosting drive portion

[0052] 18 Heat exchange pipeline

[0053] 181 First common pipeline

[0054] 182 Second common pipeline Detailed implementation manners

[0055] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0056] It should be noted that the drawings provided in the embodiments of the present invention only illustrate the basic concept of the present invention in a schematic manner. Although only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation, the form, quantity, and ratio of each component in actual implementation can be changed arbitrarily, and the layout form of the components may also be more complex. The structures, ratios, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions that can be implemented in this application. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in this application.

[0057] Considering that liquefied natural gas (LNG) has a low temperature and contains a relatively large amount of cold energy. When LNG is pumped out of the fuel tank by a pump and heated to the temperature required by users in a heat exchanger, the cold energy of LNG is directly wasted. This embodiment provides a pressurization device for utilizing the cold energy of liquefied gas, which utilizes the fact that the volume of low-temperature LNG expands and the pressure rapidly increases after absorbing heat, and stores the high-pressure natural gas in a pressure storage container. On the one hand, the pressurized natural gas can be transported to users, and on the other hand, part of the pressurized natural gas can be used as power to maintain the continuous pressurization of LNG fuel.

[0058] Referring to Figure 1 , the pressurization device for utilizing the cold energy of liquefied gas includes a pressurization part 22, a heat exchange pipeline 18, and a pressurization driving part 23. Among them, the pressurization part 22 includes a pressurization cylinder liner 2, a pressurization piston 3 clamped in the pressurization cylinder liner 2, and a first space 191 and a second space 192 separated by the pressurization piston 3. The first space 191 is communicated with the liquefied gas supply pipeline to be pressurized. The heat exchange pipeline 18 includes an outflow pipeline 183 and a return pipeline 184. One end of the outflow pipeline 183 is communicated with the first space 191, and the other end is communicated with the second space 192. The outflow pipeline 183 allows communication in the direction from the first space 191 to the second space 192. One end of the return pipeline 184 is communicated with the first space 191, and the other end is communicated with the second space 192. The return pipeline 184 allows communication in the direction from the second space 192 to the first space 191. Heat exchange devices are provided on both the outflow pipeline 183 and the return pipeline 184. The pressurization driving part 23 is drivingly connected to the pressurization piston 3 to drive the pressurization piston 3 to reciprocate in the direction from the first space 191 to the second space 192. Thus, the pressurization device of this embodiment uses the heat exchange device on the outflow pipeline 183 connecting the first space 191 and the second space 192 to supply heat to the LNG liquefied gas introduced into the first space 191 and entering the heat exchange pipeline 18. The LNG absorbs heat and is pressurized through the heat exchange device. After the gas flowing from the second space 192 to the first space 191 through the return pipeline 184 is cooled by the heat exchange device, it enters the first space 191 to wait for re-pressurization. Furthermore, this embodiment can utilize the cold energy of natural gas for heat absorption and pressurization, and introduce the pressurized gas into the pressurization driving part 23, which can provide kinetic energy for the pressurization driving part 23, enabling the pressurization device to cycle and pressurize, saving energy.

[0059] Specifically, referring to Figure 1Or 3, the pressurizing section 22 includes a pressurizing cylinder liner 2, a pressurizing piston 3 clamped inside the pressurizing cylinder liner 2, and a first space 191 and a second space 192 separated by the pressurizing piston 3. The first space 191 is communicated with the liquefied gas supply pipeline to be pressurized. Among them, the first space 191 is used to store the liquefied gas to be pressurized, and the second space 192 is used to store the pressurized gas. Optionally, a fourth one-way valve 1 is arranged on the liquefied gas supply pipeline to be pressurized, and the fourth one-way valve 1 controls the one-way entry of the liquefied gas to be pressurized into the first space 191.

[0060] Refer to Figure 1 Or 3, the heat exchange pipeline 18 is communicated with the first space 191 and the second space 192 of the pressurizing section 22, and is used to convey the liquefied gas in the first space 191 to the second space 192 after heating and pressurizing, or convey the gas in the second space 192 to the first space 191 after cooling and depressurizing. The heat exchange pipeline 18 includes an outflow pipeline 183 and a return pipeline 184. One end of the outflow pipeline 183 is communicated with the first space 191, and the other end is communicated with the second space 192. The outflow pipeline 183 allows communication in the direction from the first space 191 to the second space 192, so as to be used for the one-way flow of the liquefied gas from the first space 191 into the second space 192. And a heat exchange device is arranged on the outflow pipeline 183. The heat exchange device can be a heat exchanger 5, and the heat exchanger 5 is used to heat and pressurize the liquefied gas introduced into the outflow pipeline 183. One end of the return pipeline 184 is communicated with the first space 191, and the other end is communicated with the second space 192. The return pipeline 184 allows communication in the direction from the second space 192 to the first space 191, and a heat exchange device is arranged on the return pipeline 184 to be used for cooling and depressurizing the returned gas. The heat exchange device can be a reflux device 7. When the pressurizing piston 3 moves from the second space 192 to the first space 191, the gas in the second space 192 will flow back to the first space 191 through the return pipeline 184 to wait for re-pressurization.

[0061] It should be noted that refer to Figure 1Or 3, the heat exchange device can be respectively arranged on the outflow pipeline 183 and the return pipeline 184, or it can be arranged on the common pipeline for sharing. In this embodiment, the heat exchange pipeline 18 further includes a first common pipeline 181 and a second common pipeline 182. One end of the first common pipeline 181 is communicated with the first space 191, and the other end is communicated with one end of the outflow pipeline 183, forming a part of the outflow pipeline 183. The other end of the first common pipeline 181 is also communicated with one end of the return pipeline 184, forming a part of the return pipeline 184. One end of the second common pipeline 182 is communicated with the second space 192, and the other end is connected to the other end of the outflow pipeline 183, forming a part of the outflow pipeline 183. At the same time, the second common pipeline 182 is also communicated with the other end of the return pipeline 184, forming a part of the return pipeline 184. In an embodiment, the heat exchange device is a first heat exchange device arranged on the first common pipeline 181, and the first heat exchange device is a regenerator 4. During the outflow, the liquefied natural gas absorbs heat and boosts the pressure by absorbing the heat of the normal temperature medium or other media in the regenerator 4. At the same time, during the return process, the medium cooled after being absorbed by the liquefied natural gas can also cool down and reduce the pressure of the gas during the return process in the regenerator 4. That is, the regenerator 4 in this embodiment can be used as the heat exchange device on the return pipeline 184 or the heat exchange device on the outflow pipeline 183. In order to further heat up and boost the pressure of the liquefied gas in the outflow pipeline 183, in this embodiment, a second heat exchange device is further arranged on the outflow pipeline 183. The second heat exchange device is a heat exchanger 5. The heat exchanger 5 includes a first pipeline and a second pipeline. A normal temperature medium or a high temperature medium is introduced into the first pipeline, and the second pipeline is communicated with the outflow pipeline 183. In the present invention, the heat exchange device can be a heat exchanger or a regenerator. As long as the medium in the pipeline can absorb or release heat through the heat exchange device, it can be used as the heat exchange device in the present invention. The specific structure and principle of the heat exchange device are not limited in the present invention. Optionally, a first one-way valve 6 is arranged on the outflow pipeline 183, and the first one-way valve 6 is arranged behind the heat exchanger 5 along the direction from the first common pipeline 181 to the second common pipeline 182. The first one-way valve 6 controls the on-off of the outflow pipeline 183 in the direction from the first common pipeline 181 to the second common pipeline 182. A second one-way valve 7 is arranged on the return pipeline 184, and the second one-way valve 7 controls the on-off of the return pipeline 184 in the direction from the second common pipeline 182 to the first common pipeline 181. When the boosting piston 3 moves towards the first space 191, the liquefied gas in the first space 191 of the boosting cylinder sleeve 22 first enters the heat exchanger 5 and the first one-way valve 6 on the outflow pipeline 183 through the regenerator 4 on the first common pipeline 181, and then enters the second space 192. When the boosting piston 3 moves towards the second space 192, the liquefied gas at the top of the boosting cylinder sleeve 22 enters the second space 192 through the second one-way valve 7 on the return pipeline 184.The supercharging piston 3 is driven by a supercharging drive unit 23 and reciprocates between a first space 191 and a second space 192.

[0062] Referring to Figure 1 or 3, the supercharging drive unit 23 is drivingly connected to the supercharging piston 3 to drive the supercharging piston 3 to reciprocate in the direction from the first space 191 to the second space 192. The supercharging drive unit 23 includes a drive cylinder 13, a drive piston 12, a two-position four-way valve 10, a pressure storage container 9, and a pressure regulating container 15. The drive cylinder 13 is a cylindrical closed structure. The drive piston 12 is clamped inside the drive cylinder 13, and the drive piston 12 divides the drive cylinder 13 to form a third space 193 and a fourth space. The drive piston 12 is drivingly connected to the supercharging piston 3. The two-position four-way valve 10 includes a first interface a, a second interface b, a third interface c, a fourth interface d, and an in-valve adjusting rod 11. The third interface c communicates with the third space 193, the second interface b communicates with the fourth space, and the in-valve adjusting rod 11 is drivingly connected to the drive piston 12. In this embodiment, also referring to Figure 1 and Figure 2 , the supercharging drive unit 23 further includes a connecting rod 20, a piston rod 21, and a clamping structure 211. The connecting rod 20 is fixedly connected to the in-valve adjusting rod 11, and a first clamping portion 201 and a second clamping portion 202 are provided on the connecting rod 20. The piston rod 21 is disposed at one end of the drive piston 12 close to the connecting rod 20, and the clamping structure 211 is disposed at one end of the piston rod 21 away from the drive piston 12, and the clamping structure 211 is always between the first clamping portion 201 and the second clamping portion 202. When the drive piston 12 moves to the extreme position (i.e., the bottom of the drive cylinder 13) in the third space 193, the clamping structure 211 is clamped with the first clamping portion 201 and simultaneously drives the in-valve adjusting rod 11 to move towards the drive piston 12. The first interface a in the two-position four-way valve 10 is connected to the third interface c, and the second interface b is connected to the fourth interface d. When the drive piston 12 moves to the extreme position in the fourth space (i.e., the top of the drive cylinder 13), the clamping structure 211 is clamped with the second clamping portion 202 and simultaneously drives the in-valve adjusting rod 11 to move away from the drive piston 12. The first interface a in the two-position four-way valve 10 is connected to the second interface b, and the third interface c and the fourth interface d are connected.

[0063] Referring to Figure 1Or 3, the pressure storage container 9 and the pressure regulating container 15 are respectively communicated with the third space 193 and the fourth space in the driving cylinder 13 through the four-way two-position valve 10, and the pressure value in the pressure storage container 9 is greater than the pressure value in the pressure regulating container 15. The reciprocating movement of the driving piston 12 along the driving cylinder 13 is controlled by the pressure difference between the pressure storage container 9 and the pressure regulating container 15, that is, the pressure difference between the third space 193 and the fourth space, and then the movement of the boosting piston 3 is driven. Specifically, the pressure storage container 9 is communicated with the first interface a of the four-way two-position valve 10, and the pressure regulating container 15 is communicated with the fourth interface d of the four-way two-position valve 10. The pressure storage container 9 is also communicated with the second space 192 to obtain high-pressure gas in the second space 192 to provide a pressure source for the pressure storage container 9. When the adjusting rod 11 in the valve moves upward, the first interface a of the four-way two-position valve 10 is communicated with the third interface c, the pressure storage container 9 is communicated with the third space 193, the fourth interface d of the four-way two-position valve 10 is communicated with the second interface b, and then the pressure regulating container 15 is communicated with the fourth space. The pressure value in the third space 193 is greater than the pressure value in the fourth space, and the driving piston 12 moves upward. When the adjusting rod 11 in the valve moves downward, the first interface a of the four-way two-position valve 10 is communicated with the second interface b, and then the pressure storage container 9 is communicated with the fourth space. The fourth interface d of the four-way two-position valve 10 is communicated with the second interface b, and the pressure regulating container 15 is communicated with the third space 193. The pressure value in the third space 193 is less than the pressure value in the fourth space, and the driving piston 12 moves downward.

[0064] Refer to Figure 1 Or 3, the pressure storage container 9 is communicated with the second space 192 of the boosting part 22 and is unidirectionally communicated in the direction from the second space 192 to the pressure storage container 9. And a third one-way valve 8 is arranged on the connecting pipeline between the pressure storage container 9 and the second space 192 of the boosting part 22. Optionally, the pressure storage container 9 is communicated with the air outlet end of the whole boosting device, and a third regulating valve 17 is arranged on the communicating pipeline. The pressure regulating container 15 is communicated with the pressure storage container 9, and a valve is arranged on the connecting pipeline between the pressure storage container 9 and the pressure regulating container 15, and this valve is the first regulating valve 14. The pressure regulating container 15 is communicated with the air outlet end of the whole boosting device, and a second regulating valve 16 is arranged on the communicating pipeline. The pressure difference between the pressure storage container 9 and the pressure regulating container 15 can be controlled by adjusting the first regulating valve 14, the second regulating valve 16 and the third regulating valve 17, and the pressure difference between the two can be controlled at the same time. Optionally, pressure sensors are connected to both the pressure storage container 9 and the pressure regulating container 15 to detect the pressure values in the pressure storage container 9 and the pressure regulating container 15.

[0065] Refer to Figure 1Or 3. In the initial state, a certain amount of high-pressure LNG is stored in the pressure storage container 9, and the pressure in the pressure regulating container 15 is lower than that in the pressure storage container 9. The high-pressure LNG in the pressure storage container 9 enters from the first interface a on the two-position four-way valve 10 and exits from the third interface c, and then enters the bottom of the driving cylinder 13. The top of the driving cylinder 13 is connected to the second interface b on the two-position four-way valve 10 and is connected to the pressure regulating container 15 through the fourth interface d. Since the pressure in the pressure regulating container 15 is lower than that in the pressure storage container 9, the driving piston 12 moves upward under the action of the pressure difference between the bottom and the top of the driving cylinder 13, and the gas at the top of the driving cylinder 13 is discharged into the pressure regulating container 15.

[0066] Refer to Figure 1 , when the driving piston 12 moves upward, that is, in the direction from the first space 191 to the second space 192, it also drives the boosting piston 3 to move upward. At this time, the gas at the top of the boosting cylinder sleeve 2 passes through the second one-way valve 7 and is reheated and cooled through the regenerator 4, and at the same time the pressure drops. When the pressure drops to a certain value, the fourth one-way valve 1 opens, and LNG enters the bottom of the boosting cylinder sleeve 2.

[0067] Refer to Figure 1 , when the driving piston 12 moves upward to the top, it drives the valve inner adjusting rod 11 in the two-position four-way valve 10 to move upward. At this time, the gas entering from the first interface a of the pressure storage container 9 exits from the second interface b and then enters the top of the driving cylinder piston 12, while the gas at the bottom of the driving piston 12 is discharged into the pressure regulating container 15 through the third interface c and the fourth interface d.

[0068] Refer to Figure 1 , since the pressure in the fourth space 194 of the driving cylinder 13 is greater than the pressure in the third space 193, the entire driving piston starts to move downward. The one-way valve 1 closes, and the LNG inhaled at the bottom of the boosting cylinder sleeve 2 is driven by the piston to absorb heat through the regenerator 4 and the heat exchanger 5, and mainly transfers the heat to the high-temperature water glycol on the other side of the heat exchanger 5. Its own temperature and pressure increase and it becomes NG, and then enters the top of the boosting cylinder sleeve 2 through the first one-way valve 6. When the pressure in the cylinder is high enough, the high-pressure NG pushes open the third one-way valve 8 and stores the boosted gas in the pressure storage container 9.

[0069] Refer to Figure 3 , when the driving piston 12 moves downward to the bottom of the driving cylinder 13, it drives the valve inner adjusting rod 11 in the two-position four-way valve 10 to move downward. The gas entering from the first interface a of the pressure storage container 9 exits from the third interface c and then enters the bottom of the driving piston 12, while the gas at the top of the driving piston 12 is discharged into the pressure regulating container 15 through the second interface b and the fourth interface d. The boosting device completes one boosting process and returns to the original state.

[0070] In summary, the liquefied gas cold energy utilization pressurization device described in the present invention can be applied to a dual-fuel system. By using LNG to exchange heat with normal-temperature medium or high-temperature medium in a closed space, the low-temperature LNG absorbs heat, expands in volume, and the pressure rapidly increases to achieve pressurization. The pressurized natural gas is stored in a pressure storage container, and part of the pressurized natural gas is used as power. By controlling each component and valve, the entire pressurization system operates continuously in a cycle to maintain the continuous pressurization of the LNG fuel, and the natural gas after pressurization and heat absorption is stored in the pressure storage container for users to use. The liquefied gas cold energy utilization pressurization device described in the present invention utilizes the cold energy of LNG, provides a higher supply pressure for users, meets the needs of users, and saves energy.

[0071] The above embodiments only exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A pressurization device for utilizing the cold energy of liquefied gas, characterized in that, Comprising: A boosting section, including a boosting cylinder liner, a boosting piston clamped in the boosting cylinder liner, and a first space and a second space separated by the boosting piston, wherein the first space is communicated with a liquefied gas supply pipeline to be boosted; A heat exchange pipeline, including an outflow pipeline and a return pipeline. One end of the outflow pipeline is communicated with the first space, and the other end is communicated with the second space. The outflow pipeline allows communication in the direction from the first space to the second space; One end of the return pipeline is communicated with the first space, and the other end is communicated with the second space. The return pipeline allows communication in the direction from the second space to the first space. Heat exchange devices are arranged on both the outflow pipeline and the return pipeline; A boosting drive section, drivingly connected to the boosting piston to drive the boosting piston to reciprocate in the direction from the first space to the second space.

2. The liquefied gas cold energy utilization pressurization device according to claim 1, wherein The heat exchange device includes a first heat exchange device and a second heat exchange device. The first heat exchange device is arranged on the outflow pipeline, and the second heat exchange device is arranged on the return pipeline.

3. The liquefied gas cold energy utilization pressurization device according to claim 1, wherein The heat exchange pipeline further includes a first common pipeline and a second common pipeline. One end of the first common pipeline is communicated with the first space, and the other end is communicated with one end of the outflow pipeline, forming a part of the outflow pipeline; The other end of the first common pipeline is also communicated with one end of the return pipeline, forming a part of the return pipeline; One end of the second common pipeline is communicated with the second space, and the other end is connected to the other end of the outflow pipeline, forming a part of the outflow pipeline; At the same time, the second common pipeline is also communicated with the other end of the return pipeline, forming a part of the return pipeline.

4. The liquefied gas cold energy utilization pressurizing device according to claim 3, wherein A first one-way valve is arranged on the outflow pipeline. The first one-way valve is arranged behind the heat exchange device in the direction from the first common pipeline to the second common pipeline, and the first one-way valve controls the on-off of the outflow pipeline in the direction from the first common pipeline to the second common pipeline.

5. The liquefied gas cold energy utilization pressurization device according to claim 3, wherein, A second one-way valve is arranged on the return pipeline. The second one-way valve controls the on-off of the return pipeline in the direction from the second common pipeline to the first common pipeline.

6. The liquefied gas cold energy utilization pressurization device according to claim 3, characterized in that, The heat exchange device includes a first heat exchange device. The first heat exchange device is a regenerator, and the regenerator is arranged on the first common pipeline.

7. The liquefied gas cold energy utilization pressurizing device according to claim 6, wherein The heat exchange device further includes a second heat exchange device. The second heat exchange device is a heat exchanger, and the heat exchanger includes a first pipeline and a second pipeline. A normal temperature medium is introduced into the first pipeline, and the second pipeline is communicated with the outflow pipeline.

8. The liquefied gas cold energy utilization pressurization device according to claim 1, characterized in that, The boosting drive section includes: A driving cylinder; A driving piston, clamped in the driving cylinder, and the driving piston separates the driving cylinder to form a third space and a fourth space. The driving piston is drivingly connected to the boosting piston; A two-position four-way valve, including a first interface, a second interface, a third interface, a fourth interface and a valve inner adjusting rod. The third interface is communicated with the third space, the second interface is communicated with the fourth space, and the valve inner adjusting rod is drivingly connected to the driving piston; A pressure storage container, which is in communication with the second space, is unidirectionally communicated in the direction from the second space to the pressure storage container, and is in communication with the first interface; A pressure regulating container, which is in communication with the fourth interface and is in communication with the pressure storage container.

9. The liquefied gas cold energy utilization pressurizing device according to claim 8, wherein, The pressurization driving part further includes: A connecting rod, which is fixedly connected to the valve inner adjusting rod, and a first clamping part and a second clamping part are provided on the connecting rod; A clamping structure, which is arranged at one end of the driving piston close to the connecting rod, and the clamping structure is between the first clamping part and the second clamping part. When the driving piston moves to the limit position towards the third space, the clamping structure is clamped with the first clamping part and simultaneously drives the valve inner adjusting rod to move towards the driving piston; when the driving piston moves to the limit position towards the fourth space, the clamping structure is clamped with the second clamping part and simultaneously drives the valve inner adjusting rod to move away from the driving piston.

10. The pressurizing device for utilizing cold energy of liquefied gas according to claim 8, wherein, A third one-way valve is provided on the connecting pipeline between the second space and the pressure storage container.

11. The pressurizing device for utilizing the cold energy of liquefied gas according to claim 8, wherein A regulating valve is provided on the connecting pipeline between the pressure storage container and the pressure regulating container.

12. The liquefied gas cold energy utilization pressurization device according to claim 8, characterized in that, The pressure value in the pressure storage container is greater than the pressure value in the pressure regulating container.

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