CN107573977B - Liquefied natural gas recondenser - Google Patents
Liquefied natural gas recondenser Download PDFInfo
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- CN107573977B CN107573977B CN201610519013.9A CN201610519013A CN107573977B CN 107573977 B CN107573977 B CN 107573977B CN 201610519013 A CN201610519013 A CN 201610519013A CN 107573977 B CN107573977 B CN 107573977B
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Abstract
The invention discloses a liquefied natural gas recondenser, which mainly comprises an outer cylinder, an LNG uniform distributor, an inner cylinder and a filler, wherein a gas-liquid mixing space is formed in a gap between the LNG uniform distributor and the inner cylinder; the inner barrel is a vertically-through barrel with an opening at the upper end and an annular outer hem at the lower end, the inner barrel is welded with the inner wall of the outer barrel through the annular outer hem at the lower end, an annular space with a closed bottom and a communicated upper part with a gas-liquid mixing space is formed between the outer wall of the inner barrel and the inner wall of the outer barrel, the bottom of the annular space is provided with a BOG bottom inlet pipe, the gas-liquid mixing space is provided with a BOG upper inlet pipe, and the filler is arranged at the middle upper part of. The invention greatly improves the condensation efficiency of the recondenser through two-stage condensation, and simultaneously improves the stability and the safety of operation.
Description
Technical Field
The invention belongs to the technical field of Liquefied Natural Gas (LNG) treatment, and particularly relates to a Liquefied Natural Gas (LNG) recondenser.
Background
The liquefied natural gas receiving station is a terminal link in an LNG industrial chain, receives liquefied natural gas from an LNG ship, stores and regasifies the liquefied natural gas, and then conveys the liquefied natural gas to downstream users, and liquefied natural gas at extremely low temperature (-162 ℃) is gasified to generate Boil Off Gas (BOG) in a receiving station system due to the operation of a pump, heat leakage of the environment, replacement effect during ship unloading, equipment pipeline cold insulation and the like.
The BOG recovery processing technology of the LNG receiving station mainly comprises direct compression output and pressurization, gasification and output after being condensed into LNG through a recondenser, the direct compression output technology needs low-pressure users or low-pressure output pipe networks matched with the downstream, the downstream output pipe networks of domestic LNG receiving stations are generally high-pressure pipe networks and lack related matched industries, so BOG gas is processed by the recondensing technology completely, and the technology is also adopted abroad.
When the LNG evaporation gas adopts the recondensation recovery process, the recondensor is a main device in the process system, plays a central role after starting in the operation of the whole receiving station, and mainly has the main functions of providing enough contact time and space for BOG and LNG to promote the condensation of the BOG into the LNG and serving as an inlet buffer tank of the LNG high-pressure pump to ensure the inlet pressure of the high-pressure pump. The structure of the recondenser mainly comprises two structures of a double-shell double-tank structure and a single-shell single-tank structure, the recondenser of KOGAS company adopts the double-shell double-tank structure, an inner tank is isolated from the top of an outer tank, the bottom of the inner tank is communicated with the bottom of the outer tank, a Jiangsu LNG receiving station adopts the single-tank single-shell structure, the inner tank and the outer tank both adopt packing processes, the difference in operation is mainly reflected in different control modes, the pressure control of the double-shell double-tank recondenser is mainly carried out by the BOG pressure of an annular space, and the mutual influence of all process parameters of the pressure control of the single-shell structure of.
The outer annular space of the double-tank double-shell structure is only used for pressure control of the recondenser, so that the tank inner space is wasted, the occupied area is increased, and the recondensing efficiency is relatively reduced; the single-tank single-shell structure causes great difficulty in control because all BOG enters the same space through a pipeline to participate in condensation.
Disclosure of Invention
The invention provides a liquefied natural gas recondenser, aiming at solving the technical problems of low recondensing efficiency of evaporated gas, difficult pressure control and the like in the prior art.
The liquefied natural gas recondenser mainly comprises an outer cylinder, an LNG uniform distributor, an inner cylinder and a filler, wherein the LNG uniform distributor is arranged at the upper part of the outer cylinder, the inner cylinder is arranged below the LNG uniform distributor, and a gas-liquid mixing space is formed by a gap between the LNG uniform distributor and the inner cylinder; interior barrel is upper end opening, the upper and lower barrel that link up of outer hem of lower extreme belt ring shape, interior barrel welds through the outer hem of the annular of its lower extreme and urceolus inner wall, it is sealed to form the bottom between interior barrel outer wall and the outer barrel inner wall, upper portion and the communicating annular space in gas-liquid mixture space, annular space's bottom is equipped with BOG bottom inlet tube, gas-liquid mixture space is equipped with BOG upper portion inlet tube, be equipped with the LNG inlet tube on the LNG uniform distributor, outer barrel bottom is equipped with the LNG outlet pipe, upper portion in the interior barrel is located to the filler.
The LNG uniform distributor mainly comprises an LNG inlet pipe, a backflow bent pipe, a top plate, a primary liquid distribution disc and a secondary liquid distribution disc; the top plate, the primary liquid distribution disc and the secondary liquid distribution disc are arranged from top to bottom in a layered mode, mounting holes are formed in the top plate and the primary liquid distribution disc, liquid distribution holes are formed in the secondary liquid distribution disc, and a top plate opening is formed in the center of the top plate; the LNG inlet pipe is communicated with an opening of the top plate, the backflow elbow is in a 180-degree elbow shape and consists of an inlet short pipe and an outlet long pipe, the elbow part of the backflow elbow is positioned above the top plate, the outlet long pipe simultaneously penetrates through corresponding mounting holes in the top plate and the primary liquid distribution disc and is respectively welded with the top plate and the primary liquid distribution disc, and the inlet short pipe penetrates through the mounting hole in the top plate and is welded with the top plate; the outer edges of the top plate, the primary liquid distribution disc and the secondary liquid distribution disc are respectively welded with the inner wall of the outer cylinder; the top plate, the backflow bent pipe, the primary liquid distribution disc and the outer cylinder body jointly enclose a liquid filling space.
The upper end of the LNG inlet pipe penetrates through the top of the outer cylinder body and is exposed outside the outer cylinder body, and a noncondensable gas discharge pipe is arranged on the wall of the outer cylinder body between the primary liquid distribution disc and the secondary liquid distribution disc.
The mounting holes of the top plate and the primary liquid distribution disc are round holes, have the same size and are mainly used for mounting and fixing the backflow bent pipe; the arrangement of the round holes on the top plate can adopt regular triangle arrangement, namely every adjacent 3 round holes are arranged in a regular triangle; of course, the arrangement of the circular holes on the top plate can also adopt other arrangement modes, such as square arrangement, regular hexagon arrangement and the like. Because the corresponding position on the primary liquid distribution disc corresponding to the inlet short pipe of the backflow elbow pipe is not provided with the mounting hole, the number of the mounting holes of the primary liquid distribution disc is one half of that of the mounting holes of the top plate.
The liquid distribution holes of the secondary liquid distribution plate can be round holes, square holes, strip-shaped holes or other shapes and are mainly used for evenly distributing LNG. The arrangement and distribution mode of the liquid distribution holes can be determined according to actual needs, and can adopt an even distribution mode or a radiation distribution mode from the center to the periphery.
When the liquid distribution holes of the secondary liquid distribution disc are round holes, the liquid distribution holes in the secondary liquid distribution disc and the mounting holes in the primary liquid distribution disc are arranged in a staggered mode, so that the liquid distribution effect is prevented from being influenced by the overlapping of the two holes in the vertical direction.
When the liquid distribution holes of the secondary liquid distribution disc are strip-shaped holes, if the strip-shaped holes are arc-shaped, the strip-shaped holes are annularly distributed around the center of the secondary liquid distribution disc; if the strip-shaped holes are rectangular, the strip-shaped holes can be annularly distributed around the center of the secondary liquid distribution plate, and can also be radially distributed from the center to the periphery.
The backflow bent pipe is a connecting channel between the liquid filling space and the primary liquid distribution disc. For the same backflow bent pipe, two mounting holes are formed in the top plate and correspond to the backflow bent pipe, and one mounting hole is formed in the primary liquid distribution disc and corresponds to the primary liquid distribution disc. That is, for the top plate, one return bend is disposed for every two mounting holes; for the disposable liquid distribution plate, each mounting hole is provided with a backflow bent pipe. The arrangement density of the backflow bent pipe is proper, the backflow bent pipe is difficult to process when the backflow bent pipe is too high, and the liquid distribution effect of the liquid distribution plate is reduced when the backflow bent pipe is too low.
The liquid filling space is a closed space with a top plate opening as an inlet and an inlet of an inlet short pipe of the return bend as an outlet, and is mainly used for storing incoming flow LNG and causing a certain hydrostatic pressure with an LNG incoming flow pipe, the pressure difference and the LNG self kinetic energy are used as power for the LNG in the liquid filling space to enter the return bend, the liquid filling space has a certain volume, if the volume is too small, the liquid filling space is easy to cause large fluctuation, the effect of one-time liquid distribution is poor, and if the volume is too large, the liquid filling space is limited by an installation space.
In order to reduce the impact of the LNG flow from the LNG inlet pipe, an expanding pipe may be further provided between the LNG inlet pipe and the opening of the top plate, the lower end of the LNG inlet pipe being connected to the end of the expanding pipe having a smaller diameter, and the end of the expanding pipe having a larger diameter being communicated with the opening of the top plate. The expanding pipe mainly has the functions of buffering incoming flow LNG and weakening the excessive impact of the incoming flow LNG on the LNG in the liquid filling space, the expanding degree is proper, and the excessive expanding degree tends to increase the plate sectional area which does not participate in liquid distribution in the middle of the liquid distribution plate once, so that the liquid distribution effect in the central area is influenced.
The middle part of the inner cylinder body is provided with a packing bottom plate, the opening at the upper end of the inner cylinder body is provided with a packing top plate, and the packing is filled in a space surrounded by the packing top plate, the seasoning bottom plate and the inner cylinder body. The filler top plate and the filler bottom plate are designed in the same way and adopt circular hole channels, the circular holes are arranged on the section of the whole plate in a regular triangle shape, the circular holes are designed at intervals of bosses, and the opening size of the filler top plate is the same as that of the secondary liquid distribution plate; the packing bottom plate is used for supporting packing, the size of the opening is smaller than the size of the adopted packing, and the packing can be pall rings, raschig rings or regular packing.
In order to better condense BOG into LNG, an annular gas lifting disc is arranged in the annular space, the annular gas lifting disc is an annular circular plate with the inner diameter larger than the outer diameter of the inner cylinder, the annular gas lifting disc is sleeved on the outer wall of the inner cylinder and is arranged in a zigzag inclined layered mode from bottom to top, the inclined lower end of the upper annular gas lifting disc is located above the inclined higher end of the adjacent lower annular gas lifting disc, a gas lifting hole is arranged on one side of the inclined higher end of each annular gas lifting disc, the gas lifting holes are arranged in a regular triangle mode, the gas lifting holes are located in a sector area with an included angle of 60-90 degrees on the annular gas lifting discs, and the inclined lower end of the lowest annular gas lifting disc is located above an inlet pipe at the bottom of the BOG. The annular air lifting disc is respectively welded with the outer wall of the inner cylinder body and the inner wall of the outer cylinder body by the annular inner edge and the annular outer edge of the annular air lifting disc. The inclined angle of each layer of annular gas lifting disc is generally 2-3 degrees, the over-small inclined angle hinders the normal lifting of the BOG, and the over-large BOG lifts too fast to affect the condensation effect of the BOG.
In order to better distribute the BOG in the annular space, a BOG uniform distributor is arranged at the bottom of the annular space and communicated with an inlet pipe at the bottom of the BOG. The BOG uniform distributor mainly comprises a branch pipe and a fan-shaped buffer chamber, wherein the branch pipe is arranged at the bottom of the fan-shaped buffer chamber, and the top of the fan-shaped buffer chamber is provided with a gas distribution hole which is a round hole and is arranged in a regular triangle shape; the branch pipe can be one branch or two branches, when the branch pipe is two branches, the branch pipe is arranged in an axisymmetric way by taking the intersection point of the branch pipe as an axis, the included angle is 60-90 degrees, the effect of uniformly distributing BOG on the inclined lower end side of the annular gas lifting disc at the lowest layer is influenced by the undersize of the included angle, and the included angle is greatly limited by the shape space; the inner cambered surface and the outer cambered surface of the fan-shaped buffer chamber are attached to the inner cambered surface and the outer cambered surface of the annular space, the curvature radius of the inner cambered surface and the outer cambered surface of the fan-shaped buffer chamber is smaller than that of the cambered surface of the annular space, and the height of the fan-shaped buffer chamber is not too large. At this time, if the annular gas lifting disc is arranged in the annular space, the inclined lower end of the annular gas lifting disc at the lowest layer is positioned above the BOG uniform distributor.
The vortex-proof baffle is arranged at the bottom of the outer barrel body and right above the LNG outlet, the vortex-proof baffle is a circular plate, a supporting upright post is arranged on the lower surface of the vortex-proof baffle, and the vortex-proof baffle is fixed on the inner wall of the bottom of the outer barrel body through the supporting upright post.
The invention has the following advantages: according to the invention, the LNG recondenser forms a single-tank double-shell structure by adopting the inner cylinder with the annular outer folded edge, the annular space condensation section is formed in the outer shell, the filler condensation section is formed in the inner shell, and the condensation efficiency of the recondenser is improved to a great extent through two-section condensation; the BOG gas phase inlet is divided into a BOG bottom inlet and a BOG upper inlet, the pressure in the recondenser is easier to control by adopting the two BOG inlets, and the stability and the safety of operation are improved. The bottom BOG firstly ascends to enter an annular space condensing section for primary condensation recovery, and the residual BOG enters a gas-liquid mixing space to be fully contacted and mixed with LNG from an LNG uniform distributor and then descends to enter a filler condensing section for secondary condensation recovery; the upper BOG is mainly used for pressure control.
Drawings
Fig. 1 is a schematic view of the configuration of the lng recondensor of the present invention.
FIG. 2 is a schematic structural diagram of the LNG distributor of FIG. 1;
FIG. 3 is a schematic view of the top plate of FIG. 2;
FIG. 4 is a schematic structural view of the primary liquid distribution plate in FIG. 2;
FIG. 5 is a schematic structural view of the secondary liquid distribution plate in FIG. 2;
FIG. 6 is a schematic three-dimensional structure of FIG. 2;
FIG. 7 is a schematic view of the annular lifter plate of FIG. 1;
FIG. 8 is a schematic structural diagram of the BOG homogenizer in FIG. 1;
FIG. 9 is a top view of FIG. 8;
fig. 10 is a schematic diagram of the three-dimensional structure of fig. 8.
In the figure: 1-outer cylinder, 2-LNG distributor, 3-noncondensable gas discharge pipe, 4-BOG upper inlet pipe, 5-gas-liquid mixing space, 6-filler top plate, 7-filler, 8-inner cylinder, 9-filler bottom plate, 10-annular gas lifting disc, 11-annular space, 12-BOG distributor, 13-BOG bottom inlet pipe, 14-LNG liquid phase space, 15-vortex-proof baffle, 16-LNG outlet pipe, 17-LNG inlet pipe, 18-expanding pipe, 19-top plate, 20-top plate opening, 21-return bend pipe, 22-primary liquid distribution disc, 23-secondary liquid distribution disc, 24-inlet short pipe, 25-outlet long pipe, 26-liquid filling space, 27-liquid distribution hole, 28-mounting hole and 29-mounting hole, 30-air-lifting holes, 31-branch pipes, 32-fan-shaped buffer chambers and 33-air-distributing holes.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As can be seen from fig. 1, the recondenser for liquefied natural gas provided by the present invention has a vertical structure, and sequentially comprises, from top to bottom, an outer cylinder 1, an LNG equilizer 2, a noncondensable gas discharge pipe 3, a BOG upper inlet pipe 4, a gas-liquid mixing space 5, a filler top plate 6, a filler 7, an inner cylinder 8, a filler bottom plate 9, an annular gas lifting disc 10, an annular space 11, a BOG equilizer 12, a BOG bottom inlet pipe 13, an LNG liquid phase space 14, a vortex-proof baffle 15, and an LNG outlet pipe 16.
The LNG uniform distributor 2 is arranged at the upper part of the outer cylinder 1, the upper end of an LNG inlet pipe 17 of the LNG uniform distributor penetrates through the top of the outer cylinder 1 and is exposed outside the outer cylinder 1, and the non-condensable gas discharge pipe 3 is arranged on the wall of the outer cylinder 1 between the primary liquid distribution disc 22 and the secondary liquid distribution disc 23 (see the structure shown in figure 2). The BOG upper inlet pipe 4 is arranged on the wall of the outer cylinder 1 corresponding to the gas-liquid mixing space 5 and is communicated with the gas-liquid mixing space 5.
The gas-liquid mixing space 5 is communicated with the annular space 11, and a BOG bottom inlet pipe 13, a BOG uniform distributor 12 and a multilayer annular gas lifting disc 10 are sequentially arranged in the annular space 11 from bottom to top. The annular air lifting disc 10 is sleeved on the outer wall of the inner cylinder 8 and is arranged in a zigzag inclined mode, and air lifting holes 30 (shown in figure 7) are formed in the annular air lifting disc 10. A filler top plate 6 is arranged at an opening at the upper end of the inner cylinder 8, a filler bottom plate 9 is arranged in the middle of the inner cylinder, a filler 7 is filled between the filler top plate 6 and the filler bottom plate 9, circular hole channels are adopted on the filler top plate 6 and the filler bottom plate 9, the circular hole intervals are designed into bosses, and the size of an opening of the filler top plate 6 is the same as that of a liquid distribution hole 27 of the secondary liquid distribution plate (see fig. 5); the packing bottom plate 9 is used for supporting the packing 7, and the opening size is smaller than the size of the adopted packing.
The space below the packing bottom plate 9 and enclosed by the inner wall of the inner cylinder 8 and the inner wall of the outer cylinder 1 is an LNG liquid phase space 14, the bottom of the LNG liquid phase space 14 is provided with a vortex-proof baffle 15, and an LNG outlet pipe 16 is arranged at the bottom of the outer cylinder 1.
The BOG condensation channel is formed by sequentially communicating a BOG bottom inlet pipe 13, a BOG equilizer 12, an annular gas lifting disc 10, a gas-liquid mixing space 5, a filler top plate 6, a filler 7, a filler bottom plate 9 and an LNG liquid phase space 14.
As can be seen from fig. 2 to 6, the LNG uniform distributor 2 is overall disc-shaped and mainly comprises an LNG inlet pipe 17, an expanding pipe 18, a return bend pipe 21, a top plate 19, a primary liquid distribution plate 22 and a secondary liquid distribution plate 23; the lower end of the LNG inlet pipe 17 is connected with the small-diameter end of the expanding pipe 18, and the large-diameter end of the expanding pipe 18 is communicated with the top plate opening 20; the top plate 19, the primary liquid distribution plate 22 and the secondary liquid distribution plate 23 are arranged from top to bottom in a layered manner, the backflow elbow 21 is in a 180-degree elbow shape and consists of an inlet short pipe 24 and an outlet long pipe 25, the elbow part of the backflow elbow 21 is positioned above the top plate 19, the outlet long pipe 25 penetrates through a mounting hole 29 and a mounting hole 28 on the top plate 19 and the primary liquid distribution plate 22 and is respectively welded with the top plate 19 and the primary liquid distribution plate 22, the inlet short pipe 24 penetrates through the mounting hole 29 on the top plate 19 and is welded with the top plate 19, the secondary liquid distribution plate 23 is provided with liquid distribution holes 27, the liquid distribution holes 27 are round holes and are uniformly distributed, and the liquid distribution holes 27 can also be in other shapes and other arrangement distribution modes; the outer edges of the top plate 19, the primary liquid distribution plate 22 and the secondary liquid distribution plate 23 are respectively welded with the inner wall of the outer cylinder 1; the top plate 19, the return bend 21, the primary liquid distribution plate 22 and the outer cylinder 1 together enclose a liquid filling space 26. The plenum 26 is a closed space with the top plate opening 20 as the inlet and the inlet of the return elbow inlet stub 24 as the outlet.
Fig. 3 and 4 respectively show the arrangement and distribution of the mounting holes 29 and the mounting holes 28 on the top plate 19 and the liquid distribution plate 22, wherein the mounting holes 29 are arranged in a regular triangle, and the number of the mounting holes 28 is one half of the number of the mounting holes 29.
Fig. 5 shows the arrangement and distribution of the liquid distribution holes 27 on the secondary liquid distribution plate.
Fig. 6 shows a schematic diagram of a three-dimensional structure of the LNG equipartition device, which can visually reflect an overall structure of the LNG equipartition device and an arrangement and distribution manner of the return bend 21.
Fig. 7 shows a schematic structural diagram of the annular gas lifting disk 10, where the annular gas lifting disk 10 is an annular circular plate, and gas lifting holes 30 are provided on the annular gas lifting disk, and the gas lifting holes 30 are only provided on one side of the annular gas lifting disk, and located in a sector area with an included angle of 60-90 degrees on the annular gas lifting disk, and arranged in a regular triangle.
Fig. 8 to 10 show the structure of the BOG distributor 12, in which the BOG distributor 12 is composed of two branch pipes 31 and a fan-shaped buffer chamber 32, the top of the fan-shaped buffer chamber 32 is provided with air distribution holes 33, and the air distribution holes 33 are circular holes and arranged in a regular triangle; the two branch pipes 31 are arranged in axial symmetry with the intersection point as the axis, and the included angle is 60-90 degrees.
As shown in fig. 1 and fig. 2, the working process of the present invention is: BOG entering from a BOG bottom inlet pipe 13 sequentially passes through a branch pipe 31 and a fan-shaped buffer chamber 32 of a BOG equilizer 12 and then enters an annular space condensation section consisting of annular gas lifting discs 10 through gas distribution holes 33, the BOG flows from the inclined low end of the lowest layer (first layer) annular gas lifting disc to the inclined high end of the annular gas lifting disc along two semi-annular paths formed by the outer wall of an inner cylinder body, enters the inclined low end of a second layer annular gas lifting disc through gas lifting holes 30 arranged at the inclined high end, then flows to the inclined high end of the inner cylinder body along the two semi-annular paths formed by the outer wall of the inner cylinder body, and enters the inclined low end of a third layer annular gas lifting disc through gas lifting holes 30 arranged at the inclined high end, so that the BOG sequentially passes through zigzag channels formed by the annular gas lifting discs of a fourth layer, a fifth layer, a sixth layer and the like to complete the first BOG; BOG entering from an inlet pipe 4 at the upper part of the BOG directly enters a gas-liquid mixing space 5; LNG entering the LNG uniform distributor 2 from the LNG inlet pipe 17 passes through the LNG expanding pipe 18, flows through the return bend pipe 21 under the action of hydrostatic pressure, and is subjected to primary liquid distribution through the LNG primary liquid distribution disc 22, and then is subjected to secondary liquid distribution through the LNG secondary liquid distribution disc 23, and the LNG subjected to secondary liquid distribution also enters the gas-liquid mixing space 5; the gas phase and the liquid phase which are uniformly mixed in the gas-liquid mixing space 5 enter the filler 7 through the filler top plate 6 for secondary condensation and recovery, and the LNG which is condensed and recovered for the second time is led out of the LNG outlet pipe 16 through the LNG liquid phase space 14 and the vortex-proof baffle 15 to be recondensed. The non-condensable gas existing in the condensation process is discharged through the non-condensable gas discharging pipe 3.
Because the recooler of the invention is a single-tank double-shell structure, the bottom of the inner cylinder 8 is isolated from the outer cylinder 1, and the top of the inner cylinder 8 is communicated with the outer cylinder 1, the liquid level in the annular space 11 is in an overflow state and is constant in the operation process, and the liquid level in the inner cylinder 1 fluctuates along with the change of the operation working condition.
Claims (28)
1. The utility model provides a liquefied natural gas recondenser, mainly comprises outer barrel, LNG equipartition ware, interior barrel and filler, and outer barrel upper portion is located to LNG equipartition ware, and LNG equipartition ware below is located to interior barrel, and the space between LNG equipartition ware and the interior barrel forms the gas-liquid mixture space, is equipped with the LNG inlet tube on the LNG equipartition ware, and outer barrel bottom is equipped with the LNG outlet pipe, and upper portion, its characterized in that in the barrel was located to the filler: the inner barrel is a vertically-through barrel with an opening at the upper end and an annular outer hem at the lower end, the inner barrel is welded with the inner wall of the outer barrel through the annular outer hem at the lower end, an annular space with a closed bottom and a communicated upper part and a gas-liquid mixing space is formed between the outer wall of the inner barrel and the inner wall of the outer barrel, a BOG bottom inlet pipe is arranged at the bottom of the annular space, and a BOG upper inlet pipe is arranged in the gas-liquid mixing space.
2. A recondenser according to claim 1, wherein: the LNG uniform distributor mainly comprises an LNG inlet pipe, a backflow bent pipe, a top plate, a primary liquid distribution disc and a secondary liquid distribution disc; the top plate, the primary liquid distribution disc and the secondary liquid distribution disc are arranged from top to bottom in a layered mode, mounting holes are formed in the top plate and the primary liquid distribution disc, liquid distribution holes are formed in the secondary liquid distribution disc, and a top plate opening is formed in the center of the top plate; the LNG inlet pipe is communicated with an opening of the top plate, the backflow elbow is in a 180-degree elbow shape and consists of an inlet short pipe and an outlet long pipe, the elbow part of the backflow elbow is positioned above the top plate, the outlet long pipe simultaneously penetrates through corresponding mounting holes in the top plate and the primary liquid distribution disc and is respectively welded with the top plate and the primary liquid distribution disc, and the inlet short pipe penetrates through the mounting hole in the top plate and is welded with the top plate; the outer edges of the top plate, the primary liquid distribution disc and the secondary liquid distribution disc are respectively welded with the inner wall of the outer cylinder; the top plate, the backflow bent pipe, the primary liquid distribution disc and the outer cylinder body jointly enclose a liquid filling space.
3. A recondenser according to claim 2, wherein: an expanding pipe is arranged between the LNG inlet pipe and the opening of the top plate, the lower end of the LNG inlet pipe is connected with the end with the small diameter of the expanding pipe, and the end with the large diameter of the expanding pipe is communicated with the opening of the top plate.
4. A recondenser according to claim 2 or 3, wherein: the mounting holes of the top plate and the primary liquid distribution plate are round holes and have the same size; the arrangement of the round holes on the top plate adopts regular triangle arrangement, and the number of the mounting holes of the liquid distribution plate at one time is one half of that of the mounting holes of the top plate.
5. A recondenser according to claim 2 or 3, wherein: the liquid distribution holes of the secondary liquid distribution disc are round holes, square holes or strip-shaped holes.
6. The recondenser of claim 5, wherein: the liquid distribution holes are uniformly distributed or radially distributed from the center to the periphery.
7. A recondenser according to claim 2 or 3, wherein: the liquid filling space is a closed space with the top plate opening as an inlet and the inlet of the inlet short pipe of the return elbow as an outlet.
8. A recondenser according to claim 2, wherein: and a noncondensable gas discharge pipe is arranged on the wall of the outer cylinder body between the primary liquid distribution disc and the secondary liquid distribution disc.
9. A recondenser according to claim 1, wherein: the middle part of the inner cylinder body is provided with a packing bottom plate, the opening at the upper end of the inner cylinder body is provided with a packing top plate, and the packing is filled in a space surrounded by the packing top plate, the seasoning bottom plate and the inner cylinder body.
10. A recondenser according to claim 9, wherein: the filler top plate and the filler bottom plate are all provided with circular hole channels, the circular holes are arranged on the section of the whole plate in a regular triangle shape, and bosses are arranged at intervals among the circular holes.
11. A recondenser according to claim 9 or 10, wherein: the packing is pall ring, Raschig ring or regular packing.
12. A recondenser according to claim 1, wherein: the annular space in be equipped with annular air-lift dish, annular air-lift dish is the cyclic annular plectane that the internal diameter is greater than inner tube body external diameter, annular air-lift dish cover is on inner tube body outer wall, be the slope layering setting of zigzag form from bottom to top, the slope low end of last layer annular air-lift dish is located the slope high-end top of adjacent next layer annular air-lift dish, every layer annular air-lift dish is equipped with the gas lift hole in its slope high-end one side, the slope low end of lowest layer annular air-lift dish is located BOG bottom inlet tube top, annular air-lift dish is welded with inner tube body outer wall and urceolus inner wall respectively with its annular inner edge and annular outer fringe.
13. A recondenser according to claim 12, wherein: the air lifting holes are arranged in a regular triangle and are positioned in a fan-shaped area with an included angle of 60-90 degrees on the annular air lifting disc.
14. A recondenser according to claim 12 or 13, wherein: the inclined angle of each layer of annular air lifting disc is 2-3 degrees.
15. A recondenser according to claim 1, wherein: the annular space bottom be equipped with BOG equipartition ware, BOG equipartition ware is linked together with BOG bottom inlet tube.
16. A recondenser according to claim 15, wherein: the BOG uniform distributor mainly comprises a branch pipe and a fan-shaped buffer chamber, wherein the branch pipe is arranged at the bottom of the fan-shaped buffer chamber, and an air distribution hole is formed in the top of the fan-shaped buffer chamber and is a round hole and is arranged in a regular triangle shape.
17. The recondenser of claim 16, wherein: the two branch pipes are arranged in an axisymmetric way by taking the intersection point as an axis, and the included angle is 60-90 degrees.
18. A recondenser according to claim 16 or 17, wherein: the inner cambered surface and the outer cambered surface of the fan-shaped buffer chamber are attached to the inner cambered surface and the outer cambered surface of the annular space, and the curvature radius of the inner cambered surface and the outer cambered surface of the fan-shaped buffer chamber is smaller than that of the cambered surface of the annular space.
19. A recondenser according to any one of claims 15 to 17, wherein: the annular space in be equipped with annular air-lift dish, annular air-lift dish is the cyclic annular plectane that the internal diameter is greater than inner tube body external diameter, annular air-lift dish cover is on inner tube body outer wall, be the slope layering of zigzag form from bottom to top and set up, the slope low end of last layer annular air-lift dish is located the slope high-end top of adjacent next layer annular air-lift dish, every layer annular air-lift dish is equipped with the gas lift hole in its slope high-end one side, the slope low end of lowest layer annular air-lift dish is located BOG equipartition ware top, annular air-lift dish is welded with inner tube body outer wall and urceolus inner wall respectively with its annular inner edge and annular outer.
20. A recondenser according to claim 19, wherein: the air lifting holes are arranged in a regular triangle and are positioned in a fan-shaped area with an included angle of 60-90 degrees on the annular air lifting disc.
21. A recondenser according to claim 19, wherein: the inclined angle of each layer of annular air lifting disc is 2-3 degrees.
22. The recondenser of claim 20, wherein: the inclined angle of each layer of annular air lifting disc is 2-3 degrees.
23. A recondenser according to claim 19, wherein: the LNG uniform distributor mainly comprises an LNG inlet pipe, a backflow bent pipe, a top plate, a primary liquid distribution disc and a secondary liquid distribution disc; the top plate, the primary liquid distribution disc and the secondary liquid distribution disc are arranged from top to bottom in a layered mode, mounting holes are formed in the top plate and the primary liquid distribution disc, liquid distribution holes are formed in the secondary liquid distribution disc, and a top plate opening is formed in the center of the top plate; the LNG inlet pipe is communicated with an opening of the top plate, the backflow elbow is in a 180-degree elbow shape and consists of an inlet short pipe and an outlet long pipe, the elbow part of the backflow elbow is positioned above the top plate, the outlet long pipe simultaneously penetrates through corresponding mounting holes in the top plate and the primary liquid distribution disc and is respectively welded with the top plate and the primary liquid distribution disc, and the inlet short pipe penetrates through the mounting hole in the top plate and is welded with the top plate; the outer edges of the top plate, the primary liquid distribution disc and the secondary liquid distribution disc are respectively welded with the inner wall of the outer cylinder; the top plate, the backflow bent pipe, the primary liquid distribution disc and the outer cylinder body jointly enclose a liquid filling space.
24. The recondenser of claim 23, wherein: an expanding pipe is arranged between the LNG inlet pipe and the opening of the top plate, the lower end of the LNG inlet pipe is connected with the end with the small diameter of the expanding pipe, and the end with the large diameter of the expanding pipe is communicated with the opening of the top plate.
25. The recondenser of claim 24, wherein: the mounting holes of the top plate and the primary liquid distribution plate are round holes and have the same size; the arrangement of the round holes on the top plate adopts regular triangle arrangement, and the number of the mounting holes of the liquid distribution plate at one time is one half of that of the mounting holes of the top plate.
26. The recondenser of claim 23, wherein: the liquid distribution holes of the secondary liquid distribution disc are round holes, square holes or strip-shaped holes.
27. The recondenser of claim 26, wherein: the liquid distribution holes are uniformly distributed or radially distributed from the center to the periphery.
28. The recondenser of claim 23, wherein: the liquid filling space is a closed space with the top plate opening as an inlet and the inlet of the inlet short pipe of the return elbow as an outlet.
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| CN201610519013.9A CN107573977B (en) | 2016-07-05 | 2016-07-05 | Liquefied natural gas recondenser |
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| CN201610519013.9A CN107573977B (en) | 2016-07-05 | 2016-07-05 | Liquefied natural gas recondenser |
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| CN110194976B (en) * | 2018-02-27 | 2021-06-08 | 中石化广州工程有限公司 | Horizontal LNG recondenser |
| CN110193300B (en) * | 2018-02-27 | 2021-11-02 | 中石化广州工程有限公司 | LNG recondensor gas-liquid mixture equipartition ware |
| CN112177587B (en) * | 2020-09-09 | 2022-11-08 | 杭州勃扬能源设备有限公司 | Oil removing device for petroleum associated gas |
| CN113758145B (en) * | 2021-08-22 | 2022-12-06 | 芜湖中燃城市燃气发展有限公司 | Refrigeration equipment and method for natural gas liquefaction |
| CN115507618A (en) * | 2022-09-29 | 2022-12-23 | 甘肃蓝科石化高新装备股份有限公司 | Concurrent BOG recondenser |
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| WO2000079179A1 (en) * | 1999-06-23 | 2000-12-28 | Chicago Bridge & Iron Company | System and apparatus for condensing boil-off vapor from a liquified natural gas container |
| CN202082623U (en) * | 2011-05-19 | 2011-12-21 | 中国寰球工程公司 | Aftercondenser control system |
| CN202304246U (en) * | 2011-09-16 | 2012-07-04 | 詹姆斯丁 | Novel liquefied natural gas after-condenser device |
| US9927068B2 (en) * | 2011-12-02 | 2018-03-27 | Fluor Technologies Corporation | LNG boiloff gas recondensation configurations and methods |
| ES2746552T3 (en) * | 2014-12-24 | 2020-03-06 | Axens | Removal of hydrogen sulfide and recovery of sulfur from a gas stream by direct catalytic oxidation and Claus reaction |
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