A dehydration device and method for liquefied natural gas purification

Abstract

The present invention belongs to the technical field of natural gas dehydration, and in particular relates to a dehydration device and method for liquefied natural gas purification, including a tee pipe, a cylinder body and a disassembly and assembly mechanism. A molecular sieve assembly is arranged inside the cylinder body; the disassembly and assembly mechanism includes a core shaft, a mounting block, a first clamping seat, a second clamping seat, a fixing ring and a sliding ring. One side of the mounting block is connected to the core shaft, and a supporting block is extended and arranged at the bottom side of the mounting block. The first clamping seat is connected to the supporting block; a hydraulic cylinder is hinged at the bottom end of the mounting block, and the end of the piston rod of the hydraulic cylinder is hinged to the bottom end of a connecting rod; a fixing ring is fixedly arranged at the bottom end of the cylinder body, and a sliding ring is slidably arranged at the upper end of the cylinder body; when the second clamping seat rotates to directly above the first clamping seat, the cylinder body is in a vertical installation state; when the second clamping seat rotates away from the mounting block, the cylinder body is in a horizontal disassembly state. This structure can conveniently realize the disassembly and assembly of the molecular sieve of a small modular molecular sieve dehydration system; the operations of natural gas dehydration and molecular sieve regeneration can be carried out simultaneously.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas dehydration, and in particular relates to a dehydration device and method for liquefied natural gas purification. Background Technique

[0002] Molecular sieves are crystalline materials with specific pore sizes and structures, usually composed of aluminosilicates or carbonates. They can selectively adsorb molecules and achieve separation according to molecular size and polarity. Using molecular sieves for natural gas dehydration is an efficient and commonly used technology.

[0003] The main equipment usually required for dehydration using molecular sieves includes: a tower body, usually cylindrical or cubic in shape, filled with molecular sieves inside. When natural gas passes through the equipment, it comes into contact with the molecular sieves, and moisture is adsorbed.

[0004] Traditional large-scale tower bodies for natural gas dehydration weigh dozens of tons, are huge in size, occupy a large area, and are almost not disassemblable. Whether it is for pre-installation or later maintenance and other operations, the entire equipment needs to be shut down, and large equipment such as cranes is used for assistance.

[0005] For the above reasons, small modular molecular sieve dehydration systems are gradually being widely adopted due to their advantages such as easy disassembly and assembly, high flexibility, and good cost-effectiveness. They are suitable for new projects, renovation of existing equipment, and distributed applications. Through technological improvement and optimized layout, small modular molecular sieve dehydration systems have broad application prospects.

[0006] For small modular molecular sieve dehydration systems, one of their most important advantages is easy disassembly and assembly and high flexibility. Therefore, during the use of such equipment and during the natural gas dehydration process, natural gas dehydration is carried out continuously. However, as the dehydration time prolongs, the molecular sieves will gradually become saturated. Therefore, they need to be regenerated regularly to continue to be used, and even the molecular sieves need to be replaced and overhauled. Therefore, how to quickly disassemble and assemble the molecular sieves of small modular molecular sieve dehydration systems is the primary technical problem to be considered. Summary of the Invention

[0007] Aiming at the technical problems existing in the background technique, the present invention provides a dehydration device and method for liquefied natural gas purification.

[0008] To achieve the above object, the technical solution provided by the present invention is as follows:

[0009] A dehydration device for liquefied natural gas purification, comprising a tee pipe, a cylinder body and a disassembly and assembly mechanism. There are two tee pipes symmetrically arranged up and down. Two cylinder bodies are detachably connected between the two tee pipes. A molecular sieve assembly is arranged inside the cylinder body. A disassembly and assembly mechanism is arranged between the two tee pipes. The disassembly and assembly mechanism includes a core shaft, a mounting block, a first clamping seat, a second clamping seat, a fixed ring and a sliding ring. Both the first clamping seat and the second clamping seat are arranged in a U shape. A connecting rod is arranged on one side of the second clamping seat. One side of the mounting block is connected to the core shaft. A supporting block is extended and arranged at the bottom side of the mounting block. The first clamping seat is connected to the supporting block. The lower end of the connecting rod is hinged to the supporting block. A hydraulic cylinder is hinged at the bottom end of the mounting block. The end of the piston rod of the hydraulic cylinder is hinged to the bottom end of the connecting rod. A fixed ring is fixedly arranged at the bottom end of the cylinder body. A sliding ring is slidably arranged at the upper end of the cylinder body. Retractable first clamping shafts are arranged on both sides of the first clamping seat. The first clamping shafts are rotatably connected to the fixed ring. Retractable second clamping shafts are arranged on both sides of the second clamping seat. The second clamping shafts are rotatably connected to the sliding ring. When the second clamping seat rotates to the position directly above the first clamping seat, the cylinder body is in a vertical installation state. When the second clamping seat rotates away from the mounting block, the cylinder body is in a horizontal disassembly state.

[0010] Optionally, a hinge block is arranged on one side of the first clamping seat and is inclined downward. The hinge block is hinged to the supporting block. The bottom end of the first clamping seat is arranged on the upper end of the supporting block so that the first clamping seat is horizontally arranged. A U-shaped abutting block is arranged at the end of the connecting rod. The upper end of the abutting block has an arc-shaped abutting surface. The abutting surface is arranged close to the bottom wall of the hinge block. When the second clamping seat rotates to the position directly above the first clamping seat, the abutting surface is close to the hinge block, and the first clamping seat is arranged on the upper end of the supporting block by its own weight. When the second clamping seat rotates towards the mounting block, the abutting surface abuts the hinge block and drives the first clamping seat away from the supporting block.

[0011] Optionally, a through groove is arranged through the upper and lower parts of the mounting block. A first pin shaft hole is arranged at the bottom end of the mounting block. A second pin shaft hole is arranged on the supporting block. The hydraulic cylinder is arranged in the through groove. One end of the hydraulic cylinder is hinged in the first pin shaft hole through a pin shaft. The connecting rod passes through the through groove. A hinge shaft is arranged at the lower end of the connecting rod. The hinge shaft is arranged in the second pin shaft hole. One end of the hinge block is rotatably arranged on the hinge shaft. The hinge block is closely arranged against the side wall of the supporting block.

[0012] Optionally, a clamping groove is arranged at the bottom end of the first clamping seat. A supporting surface is arranged at the upper end of the supporting block. The supporting block is cooperatively arranged in the clamping groove.

[0013] Optionally, a limiting groove is inclinedly arranged at the upper end of the first card seat, and the axis of the limiting groove coincides with the hinge axis; when the cylinder body is in a horizontal disassembly state, the connecting rod rotates and is arranged in the limiting groove.

[0014] Optionally, mounting cylinders are respectively arranged at two interfaces of the tee pipe, and the mounting cylinders are detachably connected to the cylinder body.

[0015] Optionally, a first mounting flange is arranged on one side of the mounting cylinder, the upper and lower ends of the core shaft are respectively rotatably arranged on the connecting cylinder, and a second mounting flange is arranged at one end of the connecting cylinder.

[0016] Optionally, a valve body one, a valve body two and a valve body three are respectively arranged on the tee pipe below the cylinder body, and a valve body four, a valve body five and a valve body six are respectively arranged on the tee pipe above the cylinder body; the valve body two and the valve body three are used to control the connection or closing of the tee pipe and the cylinder body, and the valve body five and the valve body six are used to control the connection or closing of the tee pipe and the cylinder body; the valve body one and the valve body four adopt three-way valves, the valve body four is connected to the pipeline one, the pipeline one is divided into two paths and respectively connected to the mounting cylinders below, and a valve body seven and a valve body eight are respectively arranged at the two ends of the pipeline one, and the valve body seven and the valve body eight are used to control the connection or closing of the pipeline one and the mounting cylinder; the valve body one is connected to the pipeline two, the pipeline two is divided into two paths and respectively connected to the mounting cylinders above, and a valve body nine and a valve body ten are respectively arranged at the two ends of the pipeline two, and the valve body nine and the valve body ten are used to control the connection or closing of the pipeline two and the mounting cylinder.

[0017] Optionally, a pressurizing device and a heating device are sequentially arranged on the pipeline one; a cooling, separating and water removing device is arranged on the pipeline two.

[0018] A dehydration method for liquefied natural gas purification includes the following steps:

[0019] Natural gas passes through one of the cylinder bodies, and the purified natural gas is discharged after dehydration by the molecular sieve assembly; when the molecular sieve assembly in the cylinder body tends to be adsorption saturated, desorption regeneration is required. At this time, the dehydration is switched to another cylinder body, and a small amount of purified natural gas is pressurized by a booster, and then enters the adsorption saturated cylinder body after being heated by the heating device, and the moisture in the molecular sieve assembly is replaced and carried out of the cylinder body by the high-temperature natural gas, and then enters the working cylinder body or the pressurizing device for recycling after passing through the cooling, separating and water removing device. The operations of natural gas dehydration and molecular sieve regeneration can be carried out simultaneously.

[0020] The present invention has the following advantages and beneficial effects:

[0021] In the present invention, two sets of parallel cylinders are provided to simultaneously perform natural gas dehydration and the operation of regenerating another saturated molecular sieve. By displacing the moisture in the molecular sieve assembly with high-temperature natural gas and then passing it through a cooling and water separation device and entering the working cylinder or a pressurization device for recycling, there is no need to use other gases for displacement, further optimizing the dehydration and regeneration processes. Secondly, when the molecular sieve needs to be replaced, the disassembly and assembly mechanism is used to rotate the cylinder to a horizontal state, making it convenient to replace the molecular sieve at a lower position. Similarly, during installation, the disassembly and assembly mechanism can be used to rotate the horizontal cylinder to a vertical state for installation. This structure can facilitate the disassembly and assembly of the molecular sieve quickly and efficiently, improving the disassembly and assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 One of the structural diagrams of the dehydration device for liquefied natural gas purification in the present invention;

[0023] Figure 2 Another structural diagram of the dehydration device for liquefied natural gas purification in the present invention;

[0024] Figure 3 For Figure 2 The partial enlarged view at position a in

[0025] Figure 4 Another structural diagram of the dehydration device for liquefied natural gas purification in the present invention;

[0026] Figure 5 For Figure 4 The front view of

[0027] Figure 6 Another structural diagram of the dehydration device for liquefied natural gas purification in the present invention;

[0028] Figure 7 For Figure 6 The partial enlarged view at position b in

[0029] Figure 8 For Figure 6 The top view of

[0030] Figure 9 The structural diagram of the three-way pipe in the present invention;

[0031] Figure 10 The half-sectional view of the cylinder in the present invention;

[0032] Figure 11 One of the structural diagrams of the second card seat in the present invention;

[0033] Figure 12 Another structural diagram of the second card seat in the present invention;

[0034] Figure 13One of the structural diagrams of the first card seat in the present invention;

[0035] Figure 14 Another structural diagram of the first card seat in the present invention;

[0036] Figure 15 Half-sectional view of the first card seat in the present invention;

[0037] Figure 16 Structural diagram of the mounting block in the present invention;

[0038] Figure 17 System diagram of the dehydration device for purifying liquefied natural gas in the present invention.

[0039] Reference numerals: 1 - tee, 11 - mounting cylinder, 12 - first connecting flange, 13 - first mounting flange, 14 - valve body 1, 141 - pipe 2, 142 - valve body 9, 143 - valve body 10, 144 - cooling separation and water removal device, 145 - flow dividing valve, 15 - valve body 2, 16 - valve body 3, 17 - valve body 4, 171 - pipe 1, 172 - valve body 7, 173 - valve body 8, 174 - pressurizing device, 175 - heating device, 18 - valve body 5, 19 - valve body 6, 2 - connecting cylinder, 21 - core shaft, 22 - second mounting flange, 3 - mounting block, 31 - sleeve, 32 - central hole, 33 - supporting block, 34 - through groove, 35 - first pin hole, 36 - second pin hole, 4 - first card seat, 41 - first card shaft, 42 - card slot, 43 - limiting slot, 44 - hinge block, 45 - hinge hole, 5 - second card seat, 51 - second card shaft, 52 - connecting head, 53 - connecting rod, 54 - hinge head, 55 - hinge shaft, 56 - abutting block, 57 - abutting surface, 6 - cylinder body, 61 - second connecting flange, 62 - bottom ring, 63 - packing seal, 64 - molecular sieve, 7 - fixing ring, 8 - sliding ring, 9 - hollow shaft, 10 - hydraulic cylinder, 101 - piston rod, 102 - connecting pin. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0042] Embodiment 1

[0043] As shown Figures 1 - 8 in the figure, a dehydration device for liquefied natural gas purification includes a tee 1, a cylinder 6, a molecular sieve assembly, a disassembly and assembly mechanism, etc.

[0044] As shown Figures 1 - 8 in the figure, two tees 1 are symmetrically arranged up and down. The upper and lower tees 1 are fixedly arranged. The tee 1 has three interfaces. Two cylinders 6 are detachably connected between the two tees 1. A molecular sieve assembly is arranged in the cylinder 6. The molecular sieve assembly includes a packing seal 63 and a molecular sieve 64.

[0045] As shown Figures 1 - 16 in the figure, a disassembly and assembly mechanism is arranged between the two tees 1. The disassembly and assembly mechanism includes a mandrel 21, a mounting block 3, a first clamping seat 4, a second clamping seat 5, a fixing ring 7 and a sliding ring 8. Both the first clamping seat 4 and the second clamping seat 5 are arranged in a U shape. A connecting head 52 is arranged on one side of the second clamping seat 5, and a connecting rod 53 is arranged at the bottom end of the connecting head 52. One side of the mounting block 3 is connected to the mandrel 21. Specifically, a sleeve 31 is arranged on one side of the mounting block 3, a central hole 32 is opened in the sleeve 31, the sleeve 31 is arranged on the mandrel 21, and the mandrel 21 can perform a rotational movement. The mounting block 3 is arranged in a triangular shape, and a supporting block 33 is horizontally extended at the bottom side of the mounting block 3. The first clamping seat 4 is connected to the supporting block 33, and the lower end of the connecting rod 53 is hinged to the supporting block 33. A hydraulic cylinder 10 is hinged at the bottom end of the mounting block 3, and the end of the piston rod 101 of the hydraulic cylinder 10 is hinged to the bottom end of the connecting rod 53.

[0046] As shown Figures 1 - 16 in the figure, a fixing ring 7 is fixedly arranged at the bottom end of the cylinder 6, a sliding ring 8 is slidably arranged at the upper end of the cylinder 6. Telescopic first clamping shafts 41 are arranged on both sides of the first clamping seat 4, and the first clamping shafts 41 are rotatably connected to the fixing ring 7; telescopic second clamping shafts 51 are arranged on both sides of the second clamping seat 5, and the second clamping shafts 51 are rotatably connected to the sliding ring 8. The first clamping shafts 41 and the second clamping shafts 51 can be connected by a threaded connection method. The first clamping shafts 41 are threadedly connected to the first clamping seat 4, and the second clamping shafts 51 are threadedly connected to the second clamping seat 5; or by means of a cylinder or the like, the telescoping of the first clamping shafts 41 and the second clamping shafts 51 is realized.

[0047] Wherein, hollow shafts 9 are symmetrically arranged on both sides of the fixing ring 7 and the sliding ring 8. The inner diameter of the hollow shaft 9 is equivalent to the outer diameter of the first clamping shaft 41 and the second clamping shaft 51. The first clamping shaft 41 and the second clamping seat 5 can extend out and be clamped on the inner wall of the hollow shaft 9, so that the first clamping shaft 41 and the second clamping shaft 51 are rotatably arranged on the inner wall of the hollow shaft 9.

[0048] Refer to Figure 1 and Figure 2, control the extension and contraction of the hydraulic cylinder 10, when the second clamping seat 5 rotates to the top of the first clamping seat 4, the first clamping seat 4 and the second clamping seat 5 are both in a horizontal state, and the cylinder 6 is in a vertical installation state. In this case, the cylinder 6 can be disassembled and assembled by using the connection between the first clamping seat 4 and the fixed ring 7 and the connection between the second clamping seat 5 and the sliding ring 8.

[0049] Reference Figure 6 and Figure 8 ,exist Figure 1 In the state shown, the connection between the cylinder 6 and the tee 1 is first released, and then the core shaft 21 rotates to drive the mounting block 3 to rotate, and the first clamping seat 4, the second clamping seat 5 and the cylinder 6 rotate synchronously and are staggered with the tee 1; then the hydraulic cylinder 10 is controlled to contract, and when the second clamping seat 5 rotates away from the mounting block 3, the cylinder 6 gradually rotates from a vertical state to a horizontal state. When the cylinder 6 is in a horizontal disassembly state, the molecular sieve assembly in the cylinder 6 can be removed and replaced.

[0050] In the present invention, two sets of parallel cylinders 6 are provided to simultaneously dehydrate natural gas and regenerate another saturated molecular sieve 64. When the molecular sieve 64 needs to be replaced, for safety reasons, both cylinders 6 need to be deactivated, and then the cylinder 6 is rotated to a horizontal state using a disassembly mechanism, so as to facilitate replacement of the molecular sieve 64 at a low position; similarly, during installation, the horizontal cylinder 6 can be rotated to a vertical state using a disassembly mechanism for installation. This structure can conveniently and quickly realize the disassembly and assembly of the molecular sieve 64, thereby improving the disassembly and assembly efficiency.

[0051] Example 2

[0052] Since two cylinders 6 are provided, they need to be switched for use. The disassembly and assembly mechanism also needs to be switched and connected with the corresponding cylinder 6 to realize the disassembly and assembly of any cylinder 6. In order to realize the detachable connection between the disassembly mechanism and any cylinder 6, an optimized design is further made.

[0053] like Figures 1 - 16 As shown, a hinge block 44 is provided at one side of the first card seat 4, which is tilted downward. The hinge block 44 is hinged to the support block 33. The bottom end of the first card seat 4 is arranged at the upper end of the support block 33, so that the first card seat 4 is arranged horizontally. A U-shaped abutment block 56 is provided at the end of the connecting rod 53. The abutment block 56 is arranged at the lower side of the hinge block 44, and the abutment block 56 is arranged tilted upward. The upper end of the abutment block 56 has an arc-shaped abutment surface 57, and the abutment surface 57 is arranged close to the bottom wall of the hinge block 44.

[0054] like Figure 1 and Figure 3 As shown, when the second clamping seat 5 rotates to the top of the first clamping seat 4, the cylinder 6 is in a vertical state, the abutting surface 57 is close to the hinge block 44, and the first clamping seat 4 is set on the upper end of the support block 33 by its own weight.

[0055] As Figure 4 and Figure 5 shown, when the second card seat 5 rotates towards the mounting block 3, the abutting surface 57 abuts against the hinge block 44, driving the first card seat 4 away from the support block 33.

[0056] The purpose of such a design is to quickly separate the first card seat 4, the second card seat 5 and the cylinder 6. As Figure 1 shown, at this time, the first card seat 4, the second card seat 5 and the cylinder 6 are in a connected state. Assume that at this time, the cylinder 6 is installed and connected to the tee pipe 1; at this time, the entire disassembly and assembly mechanism needs to rotate to the position of the cylinder 6 on the other side to prepare for the disassembly and assembly operation of another cylinder 6. In this case, only need to disconnect the first card seat 4 from the fixed ring 7, disconnect the second card seat 5 from the sliding ring 8, and then control the hydraulic cylinder 10 to extend, so that both the first card seat 4 and the second card seat 5 rotate towards the mounting block 3 to disengage from the installed cylinder 6; that is, make the disassembly and assembly mechanism switch from the state shown in Figure 1 to the state shown in Figure 4 shown. When the first card seat 4 and the second card seat 5 are separated from the cylinder 6, the mandrel 21 can be controlled to rotate, driving the entire disassembly and assembly mechanism to rotate, and the mounting block 3, the first card seat 4 and the second card seat 5 rotate, so that the disassembly and assembly mechanism rotates to the position of the next cylinder 6 to prepare for the disassembly and assembly operation of the next cylinder 6.

[0057] This structure can adjust the position of the disassembly and assembly mechanism to quickly move it away from the cylinder 6, avoiding collision interference between the first card seat 4, the second card seat 5 and the cylinder 6 when the disassembly and assembly mechanism rotates to adjust the position.

[0058] Embodiment 3

[0059] As Figures 1 - 16 shown, the mounting block 3 is provided with a through groove 34 that penetrates up and down. The bottom end of the mounting block 3 is provided with a first pin hole 35, and the support block 33 is provided with a second pin hole 36. The hydraulic cylinder 10 is arranged in the through groove 34, and one end of the hydraulic cylinder 10 is hinged in the first pin hole 35 through a pin; the connecting rod 53 passes through the through groove 34, and the lower end of the connecting rod 53 is provided with a hinge shaft 55, and the hinge shaft 55 is arranged in the second pin hole 36. One end of the hinge block 44 has a hinge hole 45, and the hinge block 44 is rotatably arranged on the hinge shaft 55 through the hinge hole 45, and the hinge block 44 is closely arranged against the side wall of the support block 33.

[0060] This structure enables both the first clamping seat 4 and the second clamping seat 5 to rotate around the same rotation axis point, further compacting the structural design. At the same time, when the first clamping seat 4 and the second clamping seat 5 rotate around the same rotation axis point, since the abutting block 56 is arranged at the bottom end of the connecting rod 53, the abutting block 56 can abut against the hinge block 44 above it, so as to realize the rotation of the abutting block 56 driven by the rotation of the connecting rod 53 (the second clamping seat 5), and drive the first clamping seat 4 to rotate.

[0061] Therefore, in the present invention, only by cooperating with the telescopic movement of the hydraulic cylinder 10, the disassembly and assembly of the cylinder body 6 (the cylinder body 6 rotates from the vertical to the horizontal, or the cylinder body 6 rotates from the horizontal to the vertical) can be realized, and the position adjustment of the disassembly and assembly mechanism (the cylinder body 6 moves away from or approaches the cylinder body 6) can be realized.

[0062] Furthermore, a clamping groove 42 is arranged at the bottom end of the first clamping seat 4, and a supporting surface is arranged at the upper end of the supporting block 33. The supporting block 33 is cooperatively arranged in the clamping groove 42 to realize the limit connection of the first clamping seat 4.

[0063] Furthermore, a limiting groove 43 is obliquely arranged at the upper end of the first clamping seat 4, and the axis of the limiting groove 43 coincides with the hinge hole 45 (as Figure 15 shown). When the cylinder body 6 is in the horizontal disassembly state, the connecting rod 53 rotates and is arranged in the limiting groove 43 (as Figure 7 shown). In this way, the limiting groove 43 is used to limit the connecting rod 53 to ensure the limit when the cylinder body 6 rotates to the horizontal state. At the same time, the first clamping seat 4 is stably supported on the supporting block 33 to ensure the firmness and reliability of the whole structure.

[0064] As Figure 3 shown, furthermore, a hinge head 54 is arranged at the end of the connecting rod 53, and a connecting pin shaft 102 is arranged at the end of the piston rod 101. The connecting pin shaft 102 is hinged to the hinge head 54.

[0065] As Figures 1 - 6 shown, mounting cylinders 11 are respectively arranged at two interfaces of the three-way pipe 1. The mounting cylinders 11 are detachably connected to the cylinder body 6. A first connecting flange 12 is arranged on one side of the mounting cylinder 11, and second connecting flanges 61 are respectively arranged on the upper and lower sides of the cylinder body 6. The detachable connection between the mounting cylinder 11 and the cylinder body 6 can be realized by aligning and installing the first connecting flange 12 and the second connecting flange 61.

[0066] As Figures 1 - 6As shown in the figure, a first mounting flange 13 is provided on one side of the mounting cylinder 11. The upper and lower ends of the mandrel 21 are rotatably arranged on the connecting cylinder 2 respectively, and a second mounting flange 22 is provided at one end of the connecting cylinder 2. The mounting cylinder 11 and the tee 1 are connected to components such as the beam body through the first mounting flange 13, and the mandrel 21, the disassembly and assembly mechanism, etc. are connected to components such as the beam body through the second mounting flange 22. In the present invention, the rotational movement of the mandrel 21 can be realized by setting a rotational drive mechanism, such as a motor, etc.

[0067] As Figure 10 shown, a bottom ring 62 is provided on the inner wall of the bottom end of the cylinder body 6, and breathable packing seals 63 are provided at the upper and lower ends inside the cylinder body 6, and a molecular sieve 64 is provided between the two packing seals 63. This kind of structure mainly ensures the stable support and fixation of the entire molecular sieve 64 assembly when the cylinder body 6 is placed vertically.

[0068] Embodiment 4

[0069] As Figure 17 shown, a valve body one 14, a valve body two 15 and a valve body three 16 are respectively provided on the tee 1 below the cylinder body 6, and a valve body four 17, a valve body five 18 and a valve body six 19 are respectively provided on the tee 1 above the cylinder body 6.

[0070] The valve body two 15 and the valve body three 16 are used to control the connection or closing of the tee 1 and the cylinder body 6, and the valve body five 18 and the valve body six 19 are used to control the connection or closing of the tee 1 and the cylinder body 6.

[0071] The valve body one 14 and the valve body four 17 adopt three-way valves. The valve body four 17 is connected to a pipeline one 171. The pipeline one 171 is divided into two paths and is respectively connected to the mounting cylinder 11 below. Two ends of the end of the pipeline one 171 are respectively provided with a valve body seven 172 and a valve body eight 173. The valve body seven 172 and the valve body eight 173 are used to control the connection or closing of the pipeline one 171 and the mounting cylinder 11; the valve body one 14 is connected to a pipeline two 141. The pipeline two 141 is divided into two paths and is respectively connected to the mounting cylinder 11 above. Two ends of the end of the pipeline two 141 are respectively provided with a valve body nine 142 and a valve body ten 143. The valve body nine 142 and the valve body ten 143 are used to control the connection or closing of the pipeline two 141 and the mounting cylinder 11.

[0072] Furthermore, a pressurizing device 174 and a heating device 175 are sequentially arranged on the pipeline one 171. The pressurizing device 174 is used to pressurize the dehydrated natural gas, and the heating device 175 is used to heat the pressurized natural gas. A cooling, separating and water removing device 144 is arranged on the pipeline two 141. The cooling, separating and water removing device 144 is used to perform a primary water removing operation on the replaced water-containing natural gas.

[0073] Refer to Figure 17, assume that natural gas enters from the three-way pipe 1 below and exits from the three-way pipe 1 above. At this time, the left cylinder 6 is in the state of natural gas dehydration, and the right cylinder 6 is in the state of regenerating the saturated molecular sieve 64. The specific working principle and process are as follows:

[0074] The valve body one 14, valve body two 15, valve body four 17, valve body five 18, valve body eight 173, and valve body ten 143 are opened, and the valve body three 16, valve body six 19, valve body seven 172, and valve body nine 142 are closed. The un-dehydrated natural gas enters the left cylinder 6 for dehydration through the valve body one 14 and valve body two 15; the dehydrated natural gas is discharged through the valve body five 18 and valve body four 17.

[0075] A small amount of natural gas with a relatively small flow rate is diverted from the valve body four 17, enters the pressurization device 174 through the pipeline one 171 for pressurization, and enters the heating device 175 for heating; then, the heated natural gas enters the right cylinder 6 through the valve body eight 173 to replace and regenerate the saturated molecular sieve 64; the replaced natural gas enters the pipeline two 141 through the valve body ten 143, is preliminarily dewatered by the cooling and separation water removal device 144, and then the natural gas reaches the flow dividing valve 145. The natural gas is controlled by the flow dividing valve 145 to circulate to the valve body one 14 for re-dehydration, or the natural gas is controlled by the flow dividing valve 145 to return to the booster for recycling.

[0076] In the present invention, two sets of parallel cylinders 6 are provided to simultaneously perform natural gas dehydration and the operation of regenerating another saturated molecular sieve 64. The moisture in the molecular sieve 64 component is replaced and carried out of the cylinder 6 by the high-temperature natural gas, and then enters the working cylinder 6 or the pressurization device 174 for recycling after passing through the cooling and separation water removal device 144. Without using other gases for replacement, it has the functions of both natural gas dehydration and saturated molecular sieve regeneration, and further optimizes the dehydration and regeneration processes.

[0077] Embodiment 5

[0078] A dehydration method for purifying liquefied natural gas includes the following steps:

[0079] Natural gas passes through one of the cylinders 6, and the purified natural gas is discharged after dehydration by the molecular sieve component; when the molecular sieve 64 component in the cylinder 6 tends to be adsorbed and saturated, desorption and regeneration are required. At this time, the dehydration is switched to another cylinder 6. A small amount of purified natural gas is pressurized by the pressurization device 174, and then enters the adsorbed and saturated cylinder 6 after being heated by the heating device 175. The moisture in the molecular sieve 64 component is replaced and carried out of the cylinder 6 by the high-temperature natural gas, and then enters the working cylinder 6 or the pressurization device 174 for recycling after passing through the cooling and separation water removal device 144.

[0080] The small modular molecular sieve dehydration system provided by the present invention is composed of multiple dehydration devices for liquefied natural gas purification. Each dehydration device for liquefied natural gas purification includes two cylinders 6. In this way, it is convenient to quickly disassemble and assemble the molecular sieve of the small modular molecular sieve dehydration system, improving the efficiency.

[0081] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dehydration device for liquefied natural gas purification, characterized in that: It includes a tee, a cylinder body, and a disassembly and assembly mechanism. There are two tees symmetrically arranged up and down. Two cylinder bodies are detachably connected between the two tees, and a molecular sieve assembly is arranged inside the cylinder body. A disassembly and assembly mechanism is arranged between the two tees. The disassembly and assembly mechanism includes a core shaft, a mounting block, a first clamping seat, a second clamping seat, a fixing ring, and a sliding ring. The first clamping seat and the second clamping seat are both arranged in a U shape, and a connecting rod is arranged on one side of the second clamping seat. One side of the mounting block is connected to the core shaft, and a supporting block is extended and arranged at the bottom side of the mounting block. The first clamping seat is connected to the supporting block, and the lower end of the connecting rod is hinged to the supporting block. A hydraulic cylinder is hinged at the bottom end of the mounting block, and the end of the piston rod of the hydraulic cylinder is hinged to the bottom end of the connecting rod. A fixing ring is fixedly arranged at the bottom end of the cylinder body, and a sliding ring is slidably arranged at the upper end of the cylinder body. Retractable first clamping shafts are arranged on both sides of the first clamping seat, and the first clamping shafts are rotatably connected to the fixing ring. Retractable second clamping shafts are arranged on both sides of the second clamping seat, and the second clamping shafts are rotatably connected to the sliding ring. When the second clamping seat rotates to directly above the first clamping seat, the cylinder body is in a vertical installation state; when the second clamping seat rotates away from the mounting block, the cylinder body is in a horizontal disassembly state.

2. The dehydration device for liquefied natural gas purification according to claim 1, characterized in that: An articulated block is arranged on one side of the first clamping seat and slopes downward. The articulated block is hinged to the supporting block, and the bottom end of the first clamping seat is arranged on the upper end of the supporting block so that the first clamping seat is horizontally arranged. A U-shaped abutting block is arranged at the end of the connecting rod, and the upper end of the abutting block has an arc-shaped abutting surface, and the abutting surface is arranged close to the bottom wall of the articulated block. When the second clamping seat rotates to directly above the first clamping seat, the abutting surface is close to the articulated block, and the first clamping seat is arranged on the upper end of the supporting block by its own weight; when the second clamping seat rotates towards the mounting block, the abutting surface abuts the articulated block and drives the first clamping seat away from the supporting block.

3. The dehydration device for liquefied natural gas purification according to claim 2, characterized in that: A through groove is arranged through the mounting block up and down. A first pin shaft hole is arranged at the bottom end of the mounting block, and a second pin shaft hole is arranged on the supporting block. The hydraulic cylinder is arranged in the through groove, and one end of the hydraulic cylinder is hinged in the first pin shaft hole through a pin shaft. The connecting rod passes through the through groove, and a hinge shaft is arranged at the lower end of the connecting rod, and the hinge shaft is arranged in the second pin shaft hole. One end of the articulated block is rotatably arranged on the hinge shaft, and the articulated block is closely arranged against the side wall of the supporting block.

4. The dehydration device for liquefied natural gas purification according to claim 3, characterized in that: A clamping groove is arranged at the bottom end of the first clamping seat, and a supporting surface is arranged at the upper end of the supporting block. The supporting block is cooperatively arranged in the clamping groove.

5. The dehydration device for liquefied natural gas purification according to claim 3, characterized in that: A limiting groove is obliquely arranged at the upper end of the first clamping seat, and the axis of the limiting groove coincides with the hinge shaft; when the cylinder body is in a horizontal disassembly state, the connecting rod rotates and is arranged in the limiting groove.

6. The dehydration device for liquefied natural gas purification according to claim 1, characterized in that: Mounting cylinders are respectively arranged at the two interfaces of the tee, and the mounting cylinders are detachably connected to the cylinder body.

7. The dehydration device for liquefied natural gas purification according to claim 6, characterized in that: A first mounting flange is arranged on one side of the mounting cylinder. The upper and lower ends of the core shaft are respectively rotatably arranged on the connecting cylinder, and a second mounting flange is arranged at one end of the connecting cylinder.

8. The dehydration device for liquefied natural gas purification according to claim 6, characterized in that: A valve body one, a valve body two and a valve body three are respectively arranged on the three-way pipe below the cylinder body, and a valve body four, a valve body five and a valve body six are respectively arranged on the three-way pipe above the cylinder body; The valve body two and the valve body three are used to control the connection or closing of the three-way pipe and the cylinder body, and the valve body five and the valve body six are used to control the connection or closing of the three-way pipe and the cylinder body; The valve body one and the valve body four adopt three-way valves. The valve body four is connected to a pipeline one. The pipeline one is divided into two paths and is respectively connected to the installation cylinders below. At the two ends of the pipeline one, a valve body seven and a valve body eight are respectively arranged. The valve body seven and the valve body eight are used to control the connection or closing of the pipeline one and the installation cylinders; The valve body one is connected to a pipeline two. The pipeline two is divided into two paths and is respectively connected to the installation cylinders above. At the two ends of the pipeline two, a valve body nine and a valve body ten are respectively arranged. The valve body nine and the valve body ten are used to control the connection or closing of the pipeline two and the installation cylinders.

9. The dehydration device for liquefied natural gas purification according to claim 8, characterized in that: A pressurization device and a heating device are sequentially arranged on the pipeline one; a cooling, separating and water removing device is arranged on the pipeline two.

10. A method for dehydrating by using the dehydrating device for purifying liquefied natural gas according to any one of claims 1-9, comprising the following steps: Natural gas passes through one of the cylinder bodies, and the purified natural gas is discharged after being dehydrated by the molecular sieve assembly; when the molecular sieve assembly in the cylinder body tends to be adsorbed and saturated, desorption and regeneration are required. At this time, the dehydration is switched to another cylinder body. A small amount of the purified natural gas is pressurized by the pressurization device, and then enters the cylinder body with the adsorbed and saturated molecular sieve assembly after being heated by the heating device. The moisture in the molecular sieve assembly is replaced and carried out of the cylinder body by the high-temperature natural gas, and then enters the working cylinder body or the pressurization device through the cooling, separating and water removing device for recycling.

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