Natural gas liquefaction device without foundation installation

Abstract

The utility model discloses a natural gas liquefaction device without foundation installation. The natural gas liquefaction device comprises a prying seat, a separation mechanism, a heat exchange mechanism, a liquefaction mechanism, an input pipe, a first connecting pipe, a second connecting pipe and an output pipe, wherein the separation mechanism, the heat exchange mechanism and the liquefaction mechanism are mounted on the skid-mounted seat in a skid-mounted manner; the separation mechanism is communicated with the heat exchange mechanism through the first connecting pipe, and the heat exchange mechanism is communicated with the liquefaction mechanism through the second connecting pipe; one end of the input pipe is communicated with an external gas supply mechanism, the other end of the input pipe is communicated with an inlet of the separation mechanism, one end of the output pipe is communicated with an outlet of the liquefaction mechanism, and the other end of the output pipe is communicated with an external gas collection mechanism. The device is installed in a skid-mounted mode, and has the advantages of being convenient to install, high in mobility, small in occupied area, short in construction period, remarkable in environmental protection benefit and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas processing field, concretely relates to a natural gas liquefaction device without foundation installation. BACKGROUND

[0002] Global natural gas resources are unevenly distributed, such as abundant reserves in Russia, Qatar, etc., while the consumption market is concentrated in Europe, Asia, etc. Compared with pipeline transportation, LNG transportation is not limited by geography, can flexibly cover remote areas such as oceans, and the liquid volume is smaller than the gaseous volume, so the transportation cost is greatly reduced. The liquefaction treatment of natural gas has become a solid foundation for efficient storage and long-distance transmission of natural gas.

[0003] The traditional natural gas liquefaction device is complex in structure, and installation needs to go through site leveling, concrete pouring, anchor bolt pre-burying, and multiple grouting processes, and the cycle usually takes several weeks or even months. And when the traditional natural gas liquefaction device preliminarily pretreats natural gas, it cannot effectively control the residence time of natural gas in the pretreatment mechanism according to the impurity content of natural gas. It will make natural gas unable to realize efficient and accurate preliminary pretreatment, resulting in blockage and other fault phenomena of the subsequent mechanism used for a long time.

[0004] Therefore, a natural gas liquefaction device without foundation installation is needed to solve the above technical problems. UTILITY MODEL CONTENT

[0005] To achieve the above purpose, the utility model provides the following technical scheme, a natural gas liquefaction device without foundation installation, comprising: a pry seat, a separation mechanism, a heat exchange mechanism, a liquefaction mechanism, an input pipe, a first connecting pipe, a second connecting pipe and an output pipe;

[0006] Among them, the pry seat is provided with the separation mechanism, the heat exchange mechanism and the liquefaction mechanism;

[0007] The separation mechanism and the heat exchange mechanism are connected through the first connecting pipe, and the heat exchange mechanism and the liquefaction mechanism are connected through the second connecting pipe;

[0008] One end of the input pipe is connected with an external gas supply mechanism, and the other end is connected with the separation mechanism inlet; one end of the output pipe is connected with the liquefaction mechanism outlet, and the other end is connected with an external gas collection mechanism.

[0009] Further, as a preferred, the separation mechanism comprises: an outer shell, a support, an inner tube, a penetrating pipe and a cross plate;

[0010] Among them, the outer shell is provided with a plurality of groups of supports on the outer wall circumference, and one end of each group of supports away from the outer shell is pry-mounted on the pry seat;

[0011] The bottom end of the outer shell is a hemispherical structure, and the penetrating pipe penetrates the bottom end of the outer shell;

[0012] The end of the penetrating pipe away from the bottom of the outer shell is rotatably connected with the inner pipe, and the end of the inner pipe away from the penetrating pipe penetrates the transverse plate in the outer shell and is rotatably connected with the top end of the outer shell.

[0013] Further, as a preferred, the outer shell comprises: vertical flow channels, monitoring elements and curved flow channels;

[0014] Wherein, a plurality of groups of the vertical flow channels are equidistantly and circumferentially arranged on the inner wall of the outer shell, and a plurality of groups of the curved flow channels are equidistantly and circumferentially arranged on the inner wall of the hemispherical structure of the bottom of the outer shell, and the plurality of groups of the vertical flow channels and the plurality of groups of the curved flow channels are in one-to-one correspondence and communication;

[0015] The inner wall of the outer shell is provided with the monitoring elements at the inlet position.

[0016] Further, as a preferred, the inner pipe comprises: a pipe body, a main guide piece, a secondary guide piece and an air outlet;

[0017] Wherein, the main guide piece and the secondary guide piece are arranged on the outer wall of the pipe body in a staggered manner;

[0018] The top end of the inner pipe is provided with the air outlet, the air outlet penetrates the top end of the outer shell and is in communication with the first connecting pipe;

[0019] The inner pipe is driven by a driving assembly.

[0020] Further, as a preferred, the main guide piece and the secondary guide piece have opposite inclined directions of the guide surfaces and different areas of the guide surfaces.

[0021] Further, as a preferred, the penetrating pipe comprises: a lower pipe, an upper pipe, a partition plate, a lower flow port, an air suction port, an air suction accessory and an opening;

[0022] Wherein, one end of the lower pipe penetrates the bottom of the outer shell, and the other end is connected with the upper pipe through the partition plate, the end of the upper pipe away from the partition plate is in communication with the inner pipe, the side of the partition plate close to the upper pipe is provided with an air suction accessory, and a plurality of groups of the openings are circumferentially arranged on the partition plate;

[0023] A plurality of groups of the lower flow ports are circumferentially arranged on the upper side of the lower pipe at the position connected with the bottom of the outer shell, and a plurality of groups of the air suction ports are circumferentially arranged on the upper pipe.

[0024] Further, as a preferred, the speed control assembly comprises: a pushing member, a push rod, a speed control block, a speed control seat and a guide member;

[0025] The pusher is arranged on the side of the partition plate close to the upper pipe, and the output end of the pusher is connected with the speed control block through a push rod.

[0026] The inner pipe is internally provided with the speed control seat, and the speed control seat is connected with the speed control block through the guide.

[0027] Further, preferably, the outer wall of the speed control block is matched with the inner wall of the speed control seat.

[0028] Further, preferably, the penetrating pipe is communicated with a liquid collecting tank arranged on the pry seat at the end away from the inner pipe, and a liquid discharge pipe is further arranged on the liquid collecting tank and communicated with an external collecting mechanism at the end away from the liquid collecting tank.

[0029] Further, preferably, the driving assembly comprises a gear ring, a gear and a motor.

[0030] The gear ring is arranged on the outer wall of the inner pipe in the space between the horizontal plate and the top end of the outer shell.

[0031] The gear ring is engaged with the gear, the gear is rotatably arranged on the horizontal plate through a rotating shaft, and the output shaft of the motor arranged at the top end of the outer shell is connected with the gear.

[0032] Compared with the prior art, the natural gas liquefaction device without foundation installation has the following beneficial effects:

[0033] Advantage one: the separation mechanism, the heat exchange mechanism and the liquefaction mechanism are pry-mounted on the pry seat in a pry-mounted mode, are communicated through detachable pipeline groups, and are all pre-fabricated.

[0034] Advantage two: the natural gas liquefaction device can effectively and flexibly control the residence time of natural gas in the pretreatment mechanism according to the impurity content of the natural gas.

[0035] Advantage three: the natural gas liquefaction device can quickly and efficiently process the natural gas with low impurity content, improve the overall liquefaction efficiency of the natural gas, and save working hours. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1It is a structure schematic diagram of a natural gas liquefaction device without foundation installation;

[0037] Figure 2 It is a structure schematic diagram of a separation mechanism of a natural gas liquefaction device without foundation installation;

[0038] Figure 3 It is a structure schematic diagram of an outer shell of a natural gas liquefaction device without foundation installation;

[0039] Figure 4 It is a structure schematic diagram of an inner tube of a natural gas liquefaction device without foundation installation;

[0040] Figure 5 It is a sectional view of a separation mechanism of a natural gas liquefaction device without foundation installation;

[0041] Figure 6 It is a structure schematic diagram of a penetrating tube of a natural gas liquefaction device without foundation installation;

[0042] In the figure: 1, pry seat; 2, separation mechanism; 21, outer shell; 211, vertical flow channel; 212, monitoring element; 213, curved flow channel; 22, support; 23, inner tube; 231, tube body; 232, main guide piece; 233, auxiliary guide piece; 234, gas outlet; 24, penetrating tube; 241, lower tube; 242, upper tube; 243, partition plate; 244, lower flow port; 245, air suction port; 246, air suction accessory; 247, opening; 25, cross plate; 3, heat exchange mechanism; 4, liquefaction mechanism; 5, speed control assembly; 51, pushing piece; 52, push rod; 53, speed control block; 54, speed control seat; 55, guide piece; 6, driving assembly; 61, gear ring; 62, gear; 63, motor; 7, input pipe; 8, first connecting pipe; 9, second connecting pipe; 10, output pipe; 11, liquid collecting tank; 12, liquid discharge pipe. DETAILED DESCRIPTION

[0043] Please refer to Figures 1-6 The utility model provides a natural gas liquefaction device without foundation installation, which comprises a pry seat 1, a separation mechanism 2, a heat exchange mechanism 3, a liquefaction mechanism 4, an input pipe 7, a first connecting pipe 8, a second connecting pipe 9 and an output pipe 10.

[0044] The separation mechanism 2, the heat exchange mechanism 3 and the liquefaction mechanism 4 are arranged on the pry seat 1.

[0045] The separation mechanism 2 and the heat exchange mechanism 3 are connected through the first connecting pipe 8, and the heat exchange mechanism 3 and the liquefaction mechanism 4 are connected through the second connecting pipe 9.

[0046] The input pipe 7 is communicated with an external gas supply mechanism at one end and communicated with the inlet of the separation mechanism 2 at the other end, and the output pipe 10 is communicated with the outlet of the liquefaction mechanism 4 at one end and communicated with an external gas collection mechanism at the other end.

[0047] As a preferred embodiment, please refer to Figure 1 The separation mechanism 2, the heat exchange mechanism 3 and the liquefaction mechanism 4 are pry-mounted on the pry seat 1 in a pry-mounted manner, are communicated with each other through detachable pipe groups, and are all pre-fabricated, so that only pry mounting and pipe group connection need to be performed on site. Compared with a traditional natural gas liquefaction device, the natural gas liquefaction device has the following advantages.

[0048] First, convenient installation: most components are pre-fabricated in a factory, the on-site installation workload is small, the installation process is simplified, and the influence of extremely harsh construction environment on project construction is reduced.

[0049] Second, strong mobility: the whole device is pry-mounted, which is more convenient for moving and transporting, and is suitable for natural gas liquefaction projects with harsh site environment, land shortage or short production cycle.

[0050] Third, small land occupation: modular design makes equipment, pipes and the like relatively concentrated, fully utilizes vertical space, and greatly reduces land occupation compared with non-modular devices.

[0051] Fourth, short construction period: factory pre-fabrication and on-site infrastructure can be promoted synchronously, and the installation period is significantly shortened compared with the traditional mode.

[0052] Fifth, significant environmental benefits: with the strengthening of environmental protection policies, the demand for natural gas as a clean fuel is gradually increasing, and the pry-mounted device helps to improve the utilization rate of natural gas and reduce environmental pollution caused by direct emission, which meets the requirements of energy saving and emission reduction.

[0053] In the embodiment, the external gas supply mechanism supplies the natural gas to be treated, the natural gas to be treated is sequentially subjected to the separation mechanism 2, the heat exchange mechanism 3 and the liquefaction mechanism 4, and is subjected to preliminary pretreatment, multi-stage heat exchange cooling and low-temperature separation operation to obtain high-purity liquid natural gas, which is transmitted to the external gas collection mechanism by the output pipe 10.

[0054] Further, the separation mechanism 2 comprises an outer shell 21, a support 22, an inner pipe 23, a penetrating pipe 24 and a cross plate 25.

[0055] The outer wall of the outer shell 21 is circumferentially provided with a plurality of groups of supports 22, and one end of each group of supports 22 away from the outer shell 21 is pry-mounted on the pry seat 1.

[0056] The bottom end of the outer shell 21 is a hemispherical structure, and the penetrating pipe 24 penetrates the bottom end of the outer shell 21.

[0057] The inner tube 23 is rotatably connected to the penetrating tube 24 away from the bottom end of the outer shell 21, and rotatably penetrates the horizontal plate 25 in the outer shell 21 away from the end of the penetrating tube 24 and is rotatably connected to the top end of the outer shell 21.

[0058] Further, the outer shell 21 comprises: vertical flow channels 211, monitoring elements 212, and curved flow channels 213.

[0059] The inner wall of the outer shell 21 is equally circumferentially provided with a plurality of groups of the vertical flow channels 211, and the inner wall of the hemispherical structure at the bottom of the outer shell 21 is equally circumferentially provided with a plurality of groups of the curved flow channels 213, and the plurality of groups of the vertical flow channels 211 and the plurality of groups of the curved flow channels 213 are in one-to-one correspondence.

[0060] The inner wall of the outer shell 21 is provided with the monitoring elements 212 at the inlet position.

[0061] In this embodiment, as shown in Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the natural gas to be treated enters the spiral space (the space between the outer shell 21 and the inner tube 23) inside the outer shell 21 from the inlet of the separation mechanism 2, is first monitored by the monitoring elements 212 at the inlet, and the monitoring elements 212 monitor the content of impurities (droplet and particle impurities) in the natural gas to be treated. The monitoring results of the monitoring elements 212 are divided into high content and low content.

[0062] Further, the inner tube 23 comprises: a tube body 231, main guide vanes 232, auxiliary guide vanes 233, and an air outlet 234.

[0063] The outer wall of the tube body 231 is provided with the main guide vanes 232 and the auxiliary guide vanes 233, and the main guide vanes 232 and the auxiliary guide vanes 233 are arranged in an alternating manner.

[0064] The top end of the inner tube 23 is provided with the air outlet 234, the air outlet 234 penetrates the top end of the outer shell 21 and is in communication with the first connecting pipe 8.

[0065] The tube body 231 is provided with a speed control assembly 5, and the inner tube 23 is driven by a driving assembly 6.

[0066] The natural gas to be treated entering into the helical space inside the outer casing 21 will make corresponding compound helical flow according to the monitoring result of the monitoring element 212 under the guidance of the primary guide vane 232 and the secondary guide vane 233 on the outer wall of the inner tube 23, and the impurities will be thrown into the vertical flow channel 211 on the inner wall of the outer casing 21, and then slide down into the curved flow channel 213.

[0067] As a preferred embodiment, the monitoring element 212 can control the rotating speed of the inner tube 23 driven by the motor 63 according to the monitoring result. That is, when the monitoring result is high content, the rotating speed of the inner tube 23 is low, and when the monitoring result is low content, the rotating speed of the inner tube 23 is high. Specifically:

[0068] When the monitoring result of the monitoring element 212 is high content, the motor 63 is controlled to drive the inner tube 23 to rotate at low speed. The natural gas to be treated entering into the helical space will flow at low speed under the guidance of the low-speed rotation of the inner tube 23. Please refer to Figure 5 , a part of the impurities in the natural gas to be treated will directly enter into the vertical flow channel 211 along the flow direction shown by the solid arrow, and then slide down into the curved flow channel 213. Since the inner tube 23 is continuously in a low-speed rotating state, another part of the natural gas to be treated will not directly enter into the vertical flow channel 211, but will flow back into the space between the primary guide vane 232 and the secondary guide vane 233 (as shown by the dashed arrow in Figure 5 ) and collide with the outer wall of the inner tube 23, and then re-rotate and enter into the vertical flow channel 211. The natural gas to be treated will gradually move downward along the vertical direction of the helical space in the above flow state, and the present application can ensure that the total residence time of the natural gas to be treated with high impurity content in the helical space is prolonged, thereby leaving sufficient time for impurity removal.

[0069] When the monitoring result of the monitoring element 212 is low content, the motor 63 is controlled to drive the inner tube 23 to rotate at high speed. The natural gas to be treated entering into the helical space will flow at high speed under the guidance of the high-speed rotation of the inner tube 23. Please refer to Figure 5 , all the natural gas to be treated will directly enter into the vertical flow channel 211 along the flow direction shown by the solid arrow, and then slide down into the curved flow channel 213. The present application can ensure that the natural gas to be treated with low impurity content is rapidly and efficiently removed in the helical space (since the impurity content is low, the residence time of the natural gas to be treated in the helical space does not need to be too long), thereby improving the preliminary pretreatment efficiency of such natural gas to be treated, and thus laying a solid foundation for improving the overall liquefaction efficiency of the natural gas.

[0070] Further, the guide surfaces of the primary guide vane 232 and the secondary guide vane 233 are opposite in inclination direction and different in area.

[0071] In the embodiment, the main guide vane 232 and the auxiliary guide vane 233 are oppositely inclined and have different guide surface areas, so that the part of the natural gas to be treated can be better refluxed into the space between the main guide vane 232 and the auxiliary guide vane 233.

[0072] It should be noted that the high speed and the low speed mentioned in the utility model are not extremely high speed or extremely low speed as perceived by the public. The high speed and the low speed mentioned in the utility model are related to the basic speed required for removing the impurities in the natural gas, that is, even if the inner tube 23 is in a low speed rotating state, the impurities in the natural gas to be treated can be removed and the reflux and re-rotation operation can be realized.

[0073] Further, the penetrating pipe 24 comprises a lower pipe 241, an upper pipe 242, a partition plate 243, a lower flow port 244, an air suction port 245, an air suction accessory 246 and an opening 247.

[0074] The lower pipe 241 penetrates through the bottom of the outer shell 21 at one end and is connected to the upper pipe 242 through the partition plate 243 at the other end. The upper pipe 242 is connected to the inner tube 23 at the end away from the partition plate 243. The partition plate 243 is provided with the air suction accessory 246 on the side close to the upper pipe 242. A plurality of openings 247 are circumferentially arranged on the partition plate 243.

[0075] A plurality of lower flow ports 244 are circumferentially arranged on the upper side of the lower pipe 241 at the position connected to the bottom of the outer shell 21. A plurality of air suction ports 245 are circumferentially arranged on the upper pipe 242.

[0076] In the embodiment, the impurities entering the curved flow channel 213 will flow through the lower flow ports 244 and then flow to the subsequent components. After the preliminary removal of the impurities, the natural gas to be treated flowing downward along the spiral space will be adsorbed by the air suction accessory 246, flow upward through the air suction port 245 into the inner tube 23 and finally flow out of the air outlet 234 to the first connecting pipe 8 for subsequent processing.

[0077] It should be noted that the air suction accessory 246 can be any component capable of attracting gas in the prior art.

[0078] Further, the speed control assembly 5 comprises a pushing member 51, a push rod 52, a speed control block 53, a speed control seat 54 and a guide member 55.

[0079] The pushing member 51 is arranged on the side of the partition plate 243 close to the upper pipe 242. The output end of the pushing member 51 is connected to the speed control block 53 through the push rod 52.

[0080] The speed control seat 54 is arranged at the top end of the inner tube 23. The guide member 55 is connected between the speed control seat 54 and the speed control block 53.

[0081] Further, the outer wall of the speed control block 53 matches the shape of the inner wall of the speed control seat 54.

[0082] As a preferred embodiment, the speed control assembly 5 inside the inner tube 23 can still control the flow speed of the natural gas after the impurities are preliminarily removed according to the monitoring result of the monitoring element 212. Specifically:

[0083] When the monitoring result of the monitoring element 212 is high content, the pusher 51 drives the speed control block 53 to move upward along the vertical direction of the inner tube 23 by means of the push rod 52, so as to reduce the size of the flow channel between the outer wall of the speed control block 53 and the inner wall of the speed control seat 54. The small flow channel can reduce the upward flow speed of the natural gas inside the inner tube 23, so as to give sufficient time for the impurities that are not removed to settle.

[0084] When the monitoring result of the monitoring element 212 is low content, the pusher 51 drives the speed control block 53 to move upward along the vertical direction of the inner tube 23 by means of the push rod 52, so as to increase the size of the flow channel between the outer wall of the speed control block 53 and the inner wall of the speed control seat 54. The large flow channel can increase the upward flow speed of the natural gas inside the inner tube 23, so as to quickly and efficiently settle the impurities that are not removed, and still improve the overall liquefaction efficiency of the natural gas.

[0085] It should be noted that the pusher 51 can be a component commonly used in the prior art, which can realize the upward and downward movement of the speed control block 53 along the vertical direction of the inner tube 23. The settled impurities will flow through the opening 247. The guide 55 assists the upward and downward movement of the speed control block 53, which can be a telescopic guide rod, but is not limited thereto.

[0086] Further, the end of the penetrating tube 24 away from the inner tube 23 is connected with the liquid collecting tank 11 located on the pry seat 1, and the liquid collecting tank 11 is further provided with a liquid discharge pipe 12, and the end of the liquid discharge pipe 12 away from the liquid collecting tank 11 is connected with an external collection mechanism.

[0087] In this embodiment, the impurities flowing through the downflow port 244 and the opening 247 will enter the liquid collecting tank 11 through the lower tube 241 of the penetrating tube 24 for storage. When the liquid collecting tank 11 is full, the staff can empty the inside of the liquid collecting tank 11 by means of the liquid discharge pipe 12.

[0088] Further, the driving assembly 6 comprises a gear ring 61, a gear 62 and a motor 63.

[0089] The gear ring 61 is arranged on the outer wall of the inner tube 23 in the space between the horizontal plate 25 and the top end of the outer shell 21.

[0090] The gear ring 61 is engaged with the gear 62, the gear 62 is arranged on the horizontal plate 25 through a rotating shaft, and the output shaft of the motor 63 arranged at the top end of the outer shell 21 is connected with the gear 62.

[0091] In the embodiment, the motor 63 drives the gear 62 to rotate, and the gear ring 61 is driven to rotate through the engagement relationship with the gear 62, and the inner tube 23 is also synchronously rotated.

[0092] In the embodiment, the motor 63 drives the gear 62 to rotate, and the gear ring 61 is driven to rotate through the engagement relationship with the gear 62, and the inner tube 23 is also synchronously rotated.

[0093] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A natural gas liquefaction apparatus for installation without foundation, characterized by: The utility model relates to a kind of gas liquefying device, including: pry seat (1), separation mechanism (2), heat exchange mechanism (3), liquefaction mechanism (4), input pipe (7), first connecting pipe (8), second connecting pipe (9) and output pipe (10); Wherein, pry seat (1) is equipped with separation mechanism (2), heat exchange mechanism (3) and liquefaction mechanism (4) on pry; Separation mechanism (2) and heat exchange mechanism (3) are connected by first connecting pipe (8), and heat exchange mechanism (3) and liquefaction mechanism (4) are connected by second connecting pipe (9); The one end of input pipe (7) is connected with external gas supply mechanism, and the other end is connected with the import of separation mechanism (2), and the one end of output pipe (10) is connected with the export of liquefaction mechanism (4), and the other end is connected with external gas collection mechanism.

2. A skid-mounted natural gas liquefaction apparatus according to claim 1, wherein: The separation mechanism (2) includes: outer shell (21), support (22), inner tube (23), penetrating pipe (24) and cross plate (25); Wherein, the outer wall of the outer shell (21) is circumferentially provided with a plurality of supports (22), and the end of each group of supports (22) away from the outer shell (21) is pry-mounted on the pry seat (1); The bottom end of the outer shell (21) is a hemispherical structure, and the penetrating pipe (24) penetrates the bottom end of the outer shell (21); The end of the penetrating pipe (24) away from the bottom of the outer shell (21) is rotatably connected with the inner tube (23), and the end of the inner tube (23) away from the penetrating pipe (24) is rotatably penetrated through the cross plate (25) in the outer shell (21) and rotatably connected with the top end of the outer shell (21).

3. A skid-mounted natural gas liquefaction apparatus according to claim 2, wherein: The outer shell (21) includes: vertical flow channel (211), monitoring element (212) and curved flow channel (213); Wherein, the inner wall of the outer shell (21) is equidistantly circumferentially provided with a plurality of vertical flow channels (211), and the inner wall of the hemispherical structure at the bottom of the outer shell (21) is equidistantly circumferentially provided with a plurality of curved flow channels (213), and a plurality of vertical flow channels (211) and a plurality of curved flow channels (213) are in one-to-one correspondence. The inner wall of the outer shell (21) is provided with the monitoring element (212) at the inlet position.

4. A skid-mounted natural gas liquefaction apparatus according to claim 2, wherein: The inner tube (23) includes: tube body (231), main guide vane (232), auxiliary guide vane (233) and gas outlet (234); Wherein, the outer wall of the tube body (231) is provided with the main guide vane (232) and the auxiliary guide vane (233), and the main guide vane (232) and the auxiliary guide vane (233) are staggered. The top end of the inner tube (23) is provided with the gas outlet (234), and the gas outlet (234) penetrates the top end of the outer shell (21) and is connected with the first connecting pipe (8); The inside of the tube body (231) is provided with a speed control assembly (5), and the inner tube (23) is driven by a driving assembly (6).

5. A skid-mounted natural gas liquefaction apparatus according to claim 4, wherein: The inclination directions of the guide surfaces of the main guide vane (232) and the auxiliary guide vane (233) are opposite, and the areas of the guide surfaces are different.

6. A self-contained natural gas liquefier as defined in claim 4, wherein: The penetrating pipe (24) comprises a lower pipe (241), an upper pipe (242), a partition plate (243), a lower flow port (244), an air suction port (245), an air suction accessory (246), and an opening (247); The lower pipe (241) penetrates through the bottom of the outer shell (21) at one end and is connected to the upper pipe (242) through the partition plate (243) at the other end; the upper pipe (242) is connected to the inner pipe (23) at the end away from the partition plate (243); the partition plate (243) is provided with an air suction accessory (246) on the side close to the upper pipe (242); and a plurality of groups of openings (247) are circumferentially arranged on the partition plate (243). A plurality of groups of lower flow ports (244) are circumferentially arranged on the upper side of the lower pipe (241) at the position connected to the bottom of the outer shell (21); and a plurality of groups of air suction ports (245) are circumferentially arranged on the upper pipe (242).

7. A free standing natural gas liquefaction device as claimed in claim 6, wherein: The speed control assembly (5) comprises a pushing piece (51), a push rod (52), a speed control block (53), a speed control seat (54), and a guide piece (55); The pushing piece (51) is arranged on the side of the partition plate (243) close to the upper pipe (242); and the output end of the pushing piece (51) is connected to the speed control block (53) through the push rod (52). The speed control seat (54) is arranged at the top end of the inner pipe (23); and the guide piece (55) is connected between the speed control seat (54) and the speed control block (53).

8. A skid-mounted natural gas liquefaction apparatus according to claim 7, wherein: The outer wall of the speed control block (53) is matched in shape with the inner wall of the speed control seat (54).

9. A self-contained natural gas liquefier according to claim 2, wherein: The end of the penetrating pipe (24) away from the inner pipe (23) is connected to the liquid collecting tank (11) arranged on the pry seat (1); the liquid collecting tank (11) is further provided with a liquid discharge pipe (12); and the end of the liquid discharge pipe (12) away from the liquid collecting tank (11) is connected to an external collecting mechanism.

10. A self-contained natural gas liquefier as defined in claim 4, wherein: The driving assembly (6) comprises a gear ring (61), a gear (62), and a motor (63); The gear ring (61) is arranged on the outer wall of the inner pipe (23) in the space between the horizontal plate (25) and the top end of the outer shell (21); The gear ring (61) is engaged with the gear (62); the gear (62) is rotatably arranged on the horizontal plate (25) through a rotating shaft; and the output shaft of the motor (63) arranged at the top end of the outer shell (21) is connected to the gear (62).

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