CN109578806B - LNG flash evaporation vapour (BOG) supercharging condensation recovery process device - Google Patents
LNG flash evaporation vapour (BOG) supercharging condensation recovery process device Download PDFInfo
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- CN109578806B CN109578806B CN201811496264.5A CN201811496264A CN109578806B CN 109578806 B CN109578806 B CN 109578806B CN 201811496264 A CN201811496264 A CN 201811496264A CN 109578806 B CN109578806 B CN 109578806B
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- 238000011084 recovery Methods 0.000 title claims abstract description 13
- 238000009833 condensation Methods 0.000 title claims abstract description 11
- 230000005494 condensation Effects 0.000 title claims abstract description 11
- 238000001704 evaporation Methods 0.000 title description 3
- 230000008020 evaporation Effects 0.000 title description 3
- 239000007921 spray Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 14
- 230000007704 transition Effects 0.000 claims abstract description 9
- 238000005381 potential energy Methods 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000009792 diffusion process Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 4
- 238000009834 vaporization Methods 0.000 claims 1
- 230000008016 vaporization Effects 0.000 claims 1
- 239000003949 liquefied natural gas Substances 0.000 description 69
- 238000010586 diagram Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000012071 phase Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009924 canning Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
Abstract
The process device for pressurized condensation recovery of LNG flash steam (BOG) is characterized by comprising a nozzle (40), a spray pipe (30), an inner jacket (20) and an outer jacket (10), which are coaxially arranged and installed; the inner jacket is composed of a pipe section (22), a transition section (21), a BOG inlet pipe (23) and a first sealing plate (24), one end of the transition section (21) is connected with the pipe section (22), and the other end is connected with the nozzle and forms a BOG medium circulation channel with the nozzle (30); the outer jacket (10) is composed of a straight pipe section (12), a hemispherical sealing plate (11), an LNG inlet pipe (13) and a second sealing plate (14); the outer jacket, the inner jacket and the nozzle form a circulating channel of LNG medium; the high potential energy of the LNG is converted into high kinetic energy by utilizing the change of the cross section of the flow channel, the pressure of the LNG is reduced, and a low-pressure area is formed at the rear end of the throat part of the nozzle and in the mixing section area of the spray pipe so as to inject BOG medium. Compared with the traditional BOG condenser, the invention saves energy by more than 30-50%.
Description
Technical Field
The invention relates to a natural gas storage technology, in particular to a device for pressurizing, condensing and recycling flash evaporation gas (BOG) of liquefied natural gas (LNG, liquefied Natural Gas).
Background
In the process of storing liquefied natural Gas (LNG, liquefied Natural Gas), although good heat insulation measures are taken for the LNG storage device, a certain amount of flash Gas (BOG) is generated by LNG heat absorption due to the influence of environmental heat, and a Gas phase space is formed by filling an unfilled region in the LNG storage tank. Because the LNG storage tank volume is fixed, when the LNG storage tank with BOG medium on the tank top is subjected to canning operation, along with the continuous pumping of the LNG medium into the storage tank, the liquid level in the tank is continuously lifted, and the BOG gas phase space in the storage tank is extruded and contracted, so that the pressure of the BOG is continuously increased. The problem that the working efficiency of the LNG delivery pump in canning operation is reduced is caused by the increase of the pressure in the LNG storage tank, and meanwhile, the safety of the LNG storage tank is threatened.
The current BOG treatment method in the LNG storage tank mainly comprises the following steps: 1. the BOG is discharged into a torch burning system, and is fully burnt by a torch; 2. performing multistage compression on BOG in an LNG storage tank, boosting the BOG to the external transmission pressure, and then conveying the BOG to a gas transmission pipe network; 3. BOG in the LNG storage tank is compressed to a certain pressure value (usually 0.7 MPa) through a compression pump, enters a condenser through a pipeline, exchanges heat with a refrigerant medium, reduces the temperature of the BOG to a saturation temperature to realize recondensing, and finally returns to the LNG storage tank or is converged into an LNG conveying pipe, is pressurized by a high-pressure conveying pump and enters a gasifier, and is gasified by the gasifier to be conveyed outwards.
Several BOG processing methods as described above have drawbacks. The flare combustion of the method 1 can cause great waste of natural gas resources; the BOG needs to be compressed in the methods 2 and 3, and the compression of the gas always has the problems of high energy consumption, low efficiency and huge equipment investment.
To address the problems of methods 2 and 3 described above, ejector devices have been introduced into known BOG recovery techniques and inventions to drain and boost BOG to reduce or replace the investment in BOG media boosting equipment (e.g., chinese patent 201310139365.8). However, when the ejector is directly used in an LNG (liquid) drainage BOG medium (gaseous) environment in a structural form of a traditional ejector (for example, chinese patent 201610862442.6), the ejection efficiency of the traditional ejector for ejecting the gaseous medium from the liquid medium is very low due to the large density difference of two fluids, so that the operation effect of the BOG recondensing recovery process is greatly influenced in practical application, and the typical structure of the traditional ejector has a very high energy-saving effect and saves more than 30-50% of energy compared with the traditional BOG condenser as shown in fig. 4.
Disclosure of Invention
The invention aims at solving the problem that the conventional injection device cannot be used for recycling BOG media due to large density difference between the BOG media and the liquefied natural gas media, and designs a device for pressurizing, condensing and recycling flash steam (BOG) so as to effectively utilize pressure potential energy of LNG boosted by a high-pressure pump to inject the BOG media generated in an LNG storage tank and boost the BOG; meanwhile, BOG and LNG are in direct contact heat exchange, so that the BOG is condensed and recovered.
The technical scheme of the invention is as follows:
the device for pressurized condensation recovery of LNG flash steam (BOG) is characterized by comprising a nozzle 40, a spray pipe 30, an inner jacket 20 and an outer jacket 10 which are coaxially arranged and installed; the inner jacket 20 is composed of a pipe section 22, a transition section 21, a BOG inlet pipe 23 and a first sealing plate 24, one end of the transition section 21 is connected with the pipe section 22, and the other end is connected with a nozzle 40 and forms a BOG medium circulation channel with a spray pipe 30; the outer jacket 10 is composed of a straight pipe section 12, a hemispherical sealing plate 11, an LNG inlet pipe 13 and a second sealing plate 14; the outer jacket 10, the inner jacket 20 and the nozzle 40 form a flow passage for LNG medium; the inner jacket 20 and the outer jacket 10 isolate LNG and BOG media, heat exchange is realized by means of temperature difference between the media, the temperature of the BOG media is reduced, and the density of the BOG media is improved; by reducing the density difference between the BOG medium and the working medium LNG, the high-efficiency injection performance of the device is realized; the spray pipe 30 is arranged in the inner jacket 20 and consists of a suction section 31, a mixing section 32 and a diffusion section 33 which are connected; wherein the diameter of the cross-section circle of the mixing section 32 is the smallest, the diameter of the cross-section circle of the cylindrical surface part of the diffuser section 33 is the next largest, and the diameter of the cross-section circle of the cylindrical surface part of the suction section 31 is the largest; through the mixing and flowing of the LNG medium and the BOG medium in the structure of the spray pipe 30, the injection, condensation and pressurization of the BOG medium are realized; the nozzle 40 is provided in the nozzle suction section 31 and has a flow passage for increasing and reducing the speed and pressure of the LNG medium; the diameter of the cross section circle of the circulation channel is firstly reduced and then enlarged to form a throat structure, and the diameter of the cross section circle of the circulation channel at the front end of the throat is larger than that at the rear end of the throat. The high potential energy of the LNG is converted into high kinetic energy by utilizing the change of the cross section of the flow channel, the pressure of the LNG is reduced, and a low-pressure area is formed at the rear end of the throat part of the nozzle and in the mixing section area of the spray pipe so as to inject BOG medium.
The tube section 22 is a smooth-surfaced round tube structure.
The tube section 25 is formed by connecting a straight section 28 and a convergent-divergent tube section.
The tube section 26 is formed by connecting a straight section 28 and a corrugated tube section.
The pipe section 27 is formed by connecting a straight section 28 and a threaded pipe section;
the inner wall surface of the straight section 28 is provided with a plurality of grooves, the groove sections are uniformly distributed on the circumference of the inner wall surface of the straight section, and the grooves extend vertically or spirally along the axial direction of the straight section.
The nozzle main body is in a combination of a cylinder and a frustum, and a fluid circulation channel which is axisymmetric is arranged at the center of the nozzle main body along the axis; the inlet of the nozzle is a cylindrical channel with a certain length, the diameter of the rear flow cross section circle is linearly reduced, and the diameter of the minimum cross section circle is reached at the throat part of the nozzle. When the flow channel extends to the nozzle outlet, the diameter of the cross section circle is linearly enlarged; the cross-sectional circle diameter of the nozzle outlet position is always smaller than the cross-sectional diameter of the nozzle inlet.
The nozzle main body is in a combination of a cylinder and a frustum, and a fluid circulation channel which is axisymmetric is arranged at the center of the nozzle main body along the axis; the inlet of the nozzle is a cylindrical channel with a certain length, the diameter of the rear flow section circle is linearly reduced, and the diameter of the minimum section circle is reached at the throat part of the nozzle; when the flow channel extends to the nozzle outlet, the diameter of the cross section circle is gradually enlarged; and 3-8 inclined taper holes are formed in the rear end of the throat part of the nozzle, the large-diameter end of each inclined taper hole is positioned on the outer side of the nozzle structure, and the small-diameter end of each inclined taper hole is positioned on the inner side of the nozzle structure. The surface of the nozzle flow channel is provided with an arc-shaped section groove at the small-diameter end of the inclined taper hole.
The invention has the beneficial effects that:
the invention can provide a device for efficiently pressurizing, condensing and recycling BOG by LNG, realizes that BOG in an LNG storage tank is injected into an LNG pipe network and a subsequent gasifier device, can pressurize and condense the BOG, reduces the investment and energy consumption of compression and condensation equipment in a BOG recycling system, and saves energy by more than 30-50% compared with the traditional BOG condenser.
Drawings
Fig. 1 is a schematic cross-sectional view of the present invention.
FIG. 2 is a schematic diagram of a second embodiment of the present invention;
(a) The inner jacket pipe section is a structural schematic diagram of a straight pipe 28 plus a zoom pipe;
(b) The inner jacket pipe section is a structural schematic diagram of a straight pipe 28 and a corrugated pipe;
(c) The inner jacket pipe section is a structural schematic diagram of a straight pipe and a threaded pipe;
(d) The inner jacket pipe section is a structural schematic diagram of the grooved pipe in the straight pipe section.
Fig. 3 is a schematic structural view of a nozzle according to a third embodiment of the present invention.
Fig. 4 is a schematic diagram of a conventional ejector. .
In the figure, 10: an outer jacket; 11: sealing the hemispherical tube; 12: a straight pipe section; 13: an LNG inlet pipe; 14: sealing the pipe; 20: an inner jacket; 21: a transition section; 22 (25, 26, 27, 28): a straight pipe section; 23: a BOG inlet pipe; 24: sealing the pipe; 30: a spray pipe; 31: a suction section; 32: a mixing section; 33: a diffuser section; 40 (50): a nozzle; 51: a nozzle inlet; 52: a nozzle throat; 53: oblique taper hole; 54: and a nozzle outlet.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Embodiment one.
As shown in figure 1 of the drawings,
a process unit for pressurized condensing recovery of LNG flash vapor (BOG) comprises an outer jacket 10, an inner jacket 20, a nozzle 40 and a spray pipe 30. The nozzle 30 is a variable diameter circular cross-section tube body composed of a suction chamber 31, a mixing chamber 32 and a diffuser chamber 33. The outer jacket 10 is composed of a pipe section 12 and a hemispherical sealing plate 11, an LNG inlet pipe 13 is arranged on the outer jacket 10 near the outlet side of the nozzle diffusion chamber 33, and the pipe section 12 of the outer jacket 10 is in a light pipe mode. The inner jacket 20 is composed of a straight pipe section 22, an excess section 21 and a jacket closure plate 24, and a BOG inlet pipe 23 is provided on the inner jacket 20 near the outlet side of the nozzle diffuser 33, the pipe section 22 of the inner jacket 20 being in the form of a light pipe.
The whole device is provided with an outer jacket 10, an inner jacket 20, a spray pipe 30 and a spray nozzle 40 from outside to inside, and the components are coaxially arranged and connected. The flow area formed between the outer jacket 10 and the inner jacket 20 and the flow area inside the nozzle 40 are combined into an LNG flow area, and the medium running in the area is a working medium, i.e., a high-pressure supercooled LNG medium; the flow area between the inner jacket 20 and the nozzle 40 and the flow area between the nozzle 40 and the nozzle suction chamber 31 are collectively referred to as BOG flow area, and the medium running in this area is the pumped medium, i.e., the low pressure, high temperature BOG medium that is ejected. The flowing area of the rear section of the nozzle at the outlet of the nozzle is the flowing area of the mixed medium of LNG and BOG. The inner jacket 20 is composed of a pipe section 22, a transition section 21, a BOG inlet pipe 23 and a first sealing plate 24, one end of the transition section 21 is connected with the pipe section 22, and the other end is connected with a nozzle 40 and forms a BOG medium circulation channel with a spray pipe 30; the outer jacket 10 is composed of a straight pipe section 12, a hemispherical sealing plate 11, an LNG inlet pipe 13 and a second sealing plate 14; the outer jacket 10, the inner jacket 20 and the nozzle 40 form a flow passage for LNG medium; the inner jacket 20 and the outer jacket 10 isolate LNG and BOG media, heat exchange is realized by means of temperature difference between the media, the temperature of the BOG media is reduced, and the density of the BOG media is improved; by reducing the density difference between the BOG medium and the working medium LNG, the high-efficiency injection performance of the device is realized; the spray pipe 30 is arranged in the inner jacket 20 and consists of a suction section 31, a mixing section 32 and a diffusion section 33 which are connected; wherein the diameter of the cross-section circle of the mixing section 32 is the smallest, the diameter of the cross-section circle of the cylindrical surface part of the diffuser section 33 is the next largest, and the diameter of the cross-section circle of the cylindrical surface part of the suction section 31 is the largest; through the mixing and flowing of the LNG medium and the BOG medium in the structure of the spray pipe 30, the injection, condensation and pressurization of the BOG medium are realized; the nozzle 40 is provided in the nozzle suction section 31 and has a flow passage for increasing and reducing the speed and pressure of the LNG medium; the diameter of the cross section circle of the circulation channel is firstly reduced and then enlarged to form a throat structure, and the diameter of the cross section circle of the circulation channel at the front end of the throat is larger than that at the rear end of the throat. The high potential energy of the LNG is converted into high kinetic energy by utilizing the change of the cross section of the flow channel, the pressure of the LNG is reduced, and a low-pressure area is formed at the rear end of the throat part of the nozzle and in the mixing section area of the spray pipe so as to inject BOG medium.
The working principle of the invention is as follows: a stream of subcooled LNG medium compressed by a high pressure pump is directed from the front end of the vaporizer and fed into the apparatus of the present invention through LNG inlet line 13. According to the law of conservation of mass, LNG medium enters the nozzle throat from the nozzle inlet, and as the flow cross-sectional area is reduced, the LNG medium flow rate is gradually increased and reaches a maximum flow rate at the minimum cross-section of the nozzle throat. The kinetic energy of the LNG medium increases during acceleration. According to the law of conservation of energy, in the absence of external energy input to the medium, the potential energy of the medium must be correspondingly reduced in order to maintain the energy balance of the system, thereby creating a low pressure region between the outlet of the nozzle 40 and the mixing chamber 32. When the pressure in the area is lower than the pressure at the BOG inlet pipe 23, the BOG medium can be ejected into the device of the invention, so that the ejection function of the BOG medium is realized.
Meanwhile, the BOG medium is mixed with the LNG medium under the action of flow inertia to enter the mixing section 32 and the diffusion section 33 of the nozzle. In the process, the two media are mixed to perform direct contact heat exchange, and the temperature of the LNG medium is lower than that of the BOG medium, so that the BOG medium is cooled, the temperature of the BOG medium is reduced below the boiling point of the BOG medium, and the BOG medium is condensed.
In addition, in the process that the BOG and LNG mixed medium enters the diffusion section from the mixing section, as the flow sectional area of the diffusion section is enlarged, the flow speed of the BOG medium which is not condensed in the mixed medium is correspondingly reduced, so that the kinetic energy of the part of BOG medium is reduced, the potential energy is correspondingly improved, and the pressure of the uncondensed BOG medium is increased, thereby realizing the supercharging function of the uncondensed BOG medium.
During the entering of BOG into the device of the invention, the BOG needs to pass through the circulation area of the circular section formed by the inner jacket 20 and the spray pipe 30 in the circulation area of BOG. In this region, since the medium running in the outer jacket 10 is the LNG medium compressed by the high pressure pump, the LNG medium is in a supercooled state, and the temperature thereof is lower than the inlet temperature of the BOG medium, heat transfer occurs between the two mediums due to the existence of the temperature difference in the device of the present invention, and the BOG medium is primarily cooled. Compared with the traditional ejector structure, the device prolongs the heat exchange process of LNG and BOG media, and increases the heat exchange area, thereby realizing the high-efficiency BOG condensation performance of the device. In addition, for the gas-phase medium, the density is increased due to the reduction of the temperature, and the ejection performance can be enhanced due to the reduction of the density difference of the gas-phase medium and the liquid-phase medium in the process of ejecting the gas-phase medium. In the device, the primary heat exchange of the LNG and the BOG medium is realized through the arrangement of the inner jacket and the outer jacket, the temperature of the BOG medium is reduced, the density difference between the BOG medium and the LNG medium is reduced, and the efficient injection efficiency is realized.
Embodiment two.
As shown in fig. 2.
Because the heat transfer efficiency is mainly limited by the heat conducting property of the gas-phase side BOG medium in the LNG and BOG heat transfer process, the corresponding heat transfer enhancement treatment can be performed on the pipe section 12 of the inner jacket on the basis of the first embodiment, and the treatment modes can be as follows: 1. the grooving treatment of the inner wall surface is adopted, and the grooving form can be a straight groove or a spiral groove along the axial direction of the pipe; 2. in the form of a threaded tube, a convergent tube or a bellows plus straight tube 28, as shown in fig. 2 (a), (b), (c), (d). Meanwhile, the structural rigidity of the inner jacket can be improved by changing the form of the inner jacket, and the structural stability of the inner jacket when bearing external pressure is improved.
Embodiment three.
As illustrated in fig. 3.
On the basis of the first embodiment, a nozzle structure with inclined taper holes can be connected to an inner jacket to realize the injection pressurizing and condensing effects on the BOG medium. The nozzle 50 has a cylindrical and conical combined axisymmetric structure. The nozzle 50 is internally perforated in its axial direction. The front end of the through hole is provided with a nozzle inlet 51, and the inner surface of the area is a cylindrical surface; the through-hole cross-sectional circle diameter then linearly decreases, with the cross-sectional diameter at the nozzle throat 52 being minimized; the cross-sectional circle thereafter expands linearly in diameter. The nozzle outlet 54 has a cross-sectional circular diameter that is smaller than the cross-sectional circular diameter of the nozzle inlet 51. The nozzle structure of the invention has the following specificity: 1. 3-8 inclined cone holes 53 are formed near the rear end of the nozzle throat 52, and the inclined cone holes 53 are uniformly distributed around the circumference of the axis of the nozzle 40. The large diameter end of the inclined taper hole 53 is positioned outside the nozzle 50, and the small diameter end of the inclined taper hole 53 is positioned inside the nozzle 50. 2. A slot with an arc-shaped section is formed at the position of the taper hole on the inner side of the nozzle 50.
When LNG medium passes through the minimum section of the throat part of the nozzle at a high speed, a small low-pressure area is formed at the rear end of the throat part of the nozzle, partial BOG medium can be introduced in advance through the inclined conical hole of the nozzle, the introduced BOG is circumferentially diffused through the action of the arc-shaped section groove, the contact surface of the LNG medium and the BOG medium is enlarged, and the injection effect of the device on the BOG is improved.
Example IV
The cooling effect of the structure according to the invention on a gaseous medium is described in an exemplary case on the basis of the structural form of the first embodiment. Wherein the main body size is that the inner diameter of the outer jacket is 48mm, the outer diameter of the inner jacket is 38mm, and the length of the straight pipe section is 1000mm. Due to CH in LNG and BOG medium 4 The components being the absolute main part, so CH 4 The heat transfer calculation was performed as a composition of cold and hot media. Wherein the inlet temperature of the cold medium is-160 ℃ and the inlet pressure is 1700kPa; the inlet temperature of the heating medium was-120℃and the inlet pressure was 300kPa. By the action of the double-layer jacket, the temperature of the heat medium can be reduced from-120 ℃ to-137.28 ℃ at the inlet, and the density of the heat medium is 3.78kg/m 3 Raised to 4.25kg/m 3 。
The invention is not related in part to the same as or can be practiced with the prior art.
Claims (6)
1. The process device for pressurized condensation recovery of LNG flash steam (BOG) is characterized by comprising a nozzle (40), a spray pipe (30), an inner jacket (20) and an outer jacket (10), which are coaxially arranged and installed; the inner jacket (20) is composed of pipe sections (22, 25, 26, 27), a transition section (21), a BOG inlet pipe (23) and a first sealing plate (24), one end of the transition section (21) is connected with the pipe sections (22, 25, 26, 27), and the other end is connected with a nozzle (40) and forms a BOG medium circulation channel with a spray pipe (30); the outer jacket (10) is composed of a straight pipe section (12), a hemispherical sealing plate (11), an LNG inlet pipe (13) and a second sealing plate (14); the outer jacket (10), the inner jacket (20) and the nozzle (40) form a circulating channel of LNG medium; the inner jacket (20) and the outer jacket (10) are used for isolating LNG and BOG media, heat exchange is realized by means of temperature difference between the media, the temperature of the BOG media is reduced, and the density of the BOG media is improved; by reducing the density difference between the BOG medium and the working medium LNG, the high-efficiency injection performance of the device is realized; the spray pipe (30) is arranged in the inner jacket (20) and consists of a suction section (31), a mixing section (32) and a diffusion section (33) which are connected; wherein the diameter of the cross section circle of the mixing section (32) is minimum, the diameter of the cross section circle of the cylindrical surface part of the diffusion section (33) is next to the diameter of the cross section circle of the cylindrical surface part of the suction section (31), and the diameter of the cross section circle of the cylindrical surface part of the suction section (31) is maximum; through mixing and flowing of LNG medium and BOG medium in the structure of the spray pipe (30), the injection, condensation and pressurization of the BOG medium are realized; the nozzle (40) is arranged at the spray pipe suction section (31) and is provided with a circulation channel for accelerating and decompressing LNG medium; the diameter of the cross section circle of the circulation channel is firstly reduced and then enlarged to form a throat structure, and the diameter of the cross section circle of the circulation channel at the front end of the throat is larger than that at the rear end of the throat; the high potential energy of the LNG is converted into high kinetic energy by utilizing the change of the section of the flow channel, the pressure of the LNG is reduced, and a low-pressure area is formed at the rear end of the throat part of the nozzle and in the mixing section area of the spray pipe so as to inject BOG medium; the nozzle main body is in a combination of a cylinder and a frustum, and a fluid circulation channel which is axisymmetric is arranged at the center of the nozzle main body along the axis; the inlet of the nozzle is a cylindrical channel with a certain length, the diameter of the rear flow section circle is linearly reduced, and the diameter of the minimum section circle is reached at the throat part of the nozzle; when the flow channel extends to the nozzle outlet, the diameter of the cross section circle is linearly enlarged; the diameter of the cross section circle at the outlet position of the nozzle is always smaller than the diameter of the cross section of the inlet of the nozzle; the rear end of the throat part of the nozzle is provided with 3-8 inclined taper holes, the large-diameter end of each inclined taper hole is positioned at the outer side of the nozzle structure, and the small-diameter end is positioned at the inner side of the nozzle structure; the surface of the nozzle flow channel is provided with an arc-shaped section groove at the small-diameter end of the inclined taper hole.
2. Process unit for pressurized condensation recovery of LNG flash (BOG) according to claim 1, characterized in that said pipe section (22) is of smooth-surfaced circular pipe structure.
3. Process unit for pressurized condensing recovery of LNG flash (BOG) according to claim 1, characterized in that said pipe section (25) is formed by a straight section (28) and a convergent-divergent pipe section.
4. A process unit for the pressurized condensing recovery of LNG flash (BOG) according to claim 1, characterized in that said pipe section (26) is formed by a straight section (28) and a corrugated pipe section connected.
5. A process unit for the pressurized condensing recovery of LNG flash (BOG) according to claim 1, characterized in that said pipe section (27) is formed by a straight section (28) and a threaded pipe section connected.
6. The process unit for pressurized condensing recovery of LNG flash vaporization gas (BOG) according to any one of claims 3 to 5, wherein a plurality of grooves are formed on the inner wall surface of the straight section (28), the groove sections are uniformly distributed on the circumference of the inner wall surface of the straight section, and the grooves extend vertically or spirally along the axial direction of the straight section.
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| CN201811496264.5A CN109578806B (en) | 2018-12-07 | 2018-12-07 | LNG flash evaporation vapour (BOG) supercharging condensation recovery process device |
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| US4247262A (en) * | 1978-12-26 | 1981-01-27 | General Electric Company | Liquid feeding and mixing arrangement including a flow-shielding ejector thermal sleeve |
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