CN110131568B - LNG transport tank - Google Patents
LNG transport tank Download PDFInfo
- Publication number
- CN110131568B CN110131568B CN201910455411.2A CN201910455411A CN110131568B CN 110131568 B CN110131568 B CN 110131568B CN 201910455411 A CN201910455411 A CN 201910455411A CN 110131568 B CN110131568 B CN 110131568B
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- Prior art keywords
- tank
- inlet pipe
- liquid inlet
- wave
- lng
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- 239000007788 liquid Substances 0.000 claims abstract description 237
- 239000007921 spray Substances 0.000 claims description 70
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 32
- 229910052757 nitrogen Inorganic materials 0.000 claims description 16
- 238000000926 separation method Methods 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 abstract description 11
- 238000010992 reflux Methods 0.000 abstract description 11
- 238000005096 rolling process Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000008645 cold stress Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009972 noncorrosive effect Effects 0.000 description 2
- 230000009965 odorless effect Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
-
- 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
-
- 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
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention belongs to the field of low-temperature equipment, and particularly relates to an LNG transport tank, which comprises a cold trap bag, a wave-proof plate, a liquid inlet pipe and an air outlet pipe, wherein the cold trap bag is arranged at the top of the LNG transport tank, the wave-proof plate divides the tank into a front region, a middle region and a rear region, the liquid inlet pipe comprises a lower liquid inlet pipe and a middle liquid inlet pipe, the lower liquid inlet pipe is arranged at the bottom of the tank, the middle liquid inlet pipe is arranged at the middle of the tank, the air outlet pipe is arranged at the upper part of the tank, the lower liquid inlet pipe and the middle liquid inlet pipe are respectively provided with a liquid outlet in each region of the front part, the middle part and the rear part of the tank, and the air outlet pipe is respectively provided with an air outlet in each region of the front part, the middle part and the rear part of the tank; the LNG in the whole tank is in a relatively supercooled state, and even if the LNG in the tank is layered, severe rolling cannot be formed; through setting up immersed pump and last feed liquor pipe, formed a set of forced reflux unit and technology at the LNG transport tank, realize the intensive mixing of LNG in the transport tank.
Description
Technical Field
The invention belongs to the field of low-temperature equipment, and particularly relates to an LNG transport tank.
Background
In the transportation process of the tank loaded with LNG, the LNG in the tank is low in density components and high in density components due to different densities of the components, and layering can be formed due to the density difference of the components with low density; because the temperature of the LNG tank changes, the LNG with high temperature has smaller density, the LNG with low temperature has larger density, the liquid with small density floats upwards, and the liquid with large density is in the lower part, so that layering phenomenon is generated. The lower LNG becomes LNG with a certain supercooling degree, vaporization speed is slower than that of the upper LNG, and external heat is always transferred from outside to inside, a considerable part of the heat obtained by the bottom LNG promotes the temperature rise of the LNG, and the density will decrease due to the temperature rise, and when the density of the bottom LNG is smaller than that of the upper LNG, the layered balance will be broken, forming so-called "rolling". Once LNG rolls over, a large amount of vaporized natural gas (BOG) is difficult to be discharged through a safety release valve in time, and in order to prevent accidents, the tank overpressure is usually prevented by arranging a safety release valve, a bleeding torch, a recovery compression system and the like.
In order to prevent tumbling, the delamination of LNG in the tank needs to be destroyed in advance, and the delamination is destroyed and the mixing is enhanced by stirring or forced reflux of a pump. However, the stirring mode is adopted for the LNG tank with large volume, only the liquid in the tank is locally disturbed, the effect is not very good, and the explosion-proof performance requirement of the LNG tank is hardly met by the conventional motor-driven stirring mode.
The Chinese patent with publication number CN203202590U discloses an LNG tank layering prevention device, and in order to meet the requirement of explosion-proof performance, a magnetic driving stirring mode is adopted, and the stirring device of the technical scheme is arranged on one side of the tank, so that the mixing effect is poor.
The Chinese patent with publication number CN203196581U discloses an automatic liquid mixing device of LNG tank, in order to meet the requirement of explosion-proof performance, a magnetic driving stirring mode is adopted, and the stirring device of the technical scheme is arranged at the central position of the tank, but the forced movement power of the blades is insufficient, and the mixing effect is poor.
Yet another way is to force the LNG tanks back through pumps, but this is generally applicable to stationary LNG tanks, with the back flow pumps being used in conjunction with stationary piping. On LNG transport tank, adopt the mode of pump forced reflux to prevent LNG layering, at first overcome the technical problem such as arrangement of reflux pump and arrangement of pipeline, prevent to influence LNG transportation's security because additionally increased equipment, secondly optimize the structure setting of pump forced reflux, strive for to realize better mixing effect with less additional energy consumption.
The Chinese patent with the publication number of CN207945491U discloses an atmospheric tank liquid inlet pipeline system, which comprises a tank body, wherein a lower liquid inlet pipeline, a back pump return pipeline and a tank pre-cooling pipeline are arranged on the tank body, the tank body is connected with a pump, the lower liquid inlet pipeline, the back pump return pipeline and the tank pre-cooling pipeline are all communicated with the pump, a bidirectional pipe is arranged between the pump and the back pump return pipeline, and the pump is connected with the outside through the bidirectional pipe; according to the technical scheme, the original back reflux pipeline of the pump bears the functions of upper liquid feeding and back reflux of the pump, so that a large amount of BOG gas generated by LNG gasification when the pipeline is idle is reduced, the original upper liquid feeding pipeline is canceled, the liquid feeding pipeline from the unloading area to the tank body is not independently arranged, and the cost is greatly reduced. However, the LNG tank according to this solution is stationary, and the pump is stationary, and thus the LNG tank cannot be directly applied to a mobile LNG carrier tank.
Disclosure of Invention
The invention aims at providing an LNG transport tank, which comprises a cold trap bag, a wave-proof plate, a liquid inlet pipe and an air outlet pipe, wherein the cold trap bag is arranged at the top of the LNG transport tank, the wave-proof plate divides the tank into a front area, a middle area and a rear area, the liquid inlet pipe comprises a lower liquid inlet pipe and a middle liquid inlet pipe, the lower liquid inlet pipe is arranged at the bottom of the tank, the middle liquid inlet pipe is arranged at the middle part of the tank, the air outlet pipe is arranged at the upper part of the tank, the liquid outlet holes are respectively arranged in the front area, the middle area and the rear area of the tank, and the air outlet pipe is respectively provided with an air outlet in the front area, the middle area and the rear area of the tank.
According to the LNG transport tank, the cold trap package is arranged, and the cold medium filled in the cold trap package cools the LNG transport tank, so that LNG in the whole tank is in a relatively supercooled state, and even if the LNG in the tank is layered, severe rolling cannot be formed. Therefore, the safety valve of the BOG burst transport tank is not discharged to the outside, and the safety and the environment in the transport process are not affected.
Preferably, the cold trap package is filled with liquid nitrogen.
The LNG in the tank is cooled continuously under the conditions that the temperature of the LNG is 162 ℃ below zero and the temperature of the liquid nitrogen is 196 ℃ below zero and the liquid nitrogen exists in the cold trap bag, so that the LNG in the tank is in a relatively supercooled state.
Moreover, liquid nitrogen is inert, colorless, odorless, noncorrosive, nonflammable, and does not support combustion. If unexpected situations occur, such as leakage of LNG in a tank, liquid nitrogen in a cold trap bag can be used for spraying or jetting a leakage area, natural gas is cooled, pressed and diluted, and explosion accidents are prevented; for example, when a vehicle or a ship for transporting LNG accidentally catches fire, liquid nitrogen in the cold trap bag can be used for extinguishing fire, so that the safety of the LNG transport tank is prevented from being influenced.
The lower liquid inlet pipe is a liquid outlet pipe when the LNG transport tank discharges.
In one mode, the LNG transportation tank further comprises an upper liquid inlet pipe and a immersed pump, the upper liquid inlet pipe is arranged on the upper portion of the tank, liquid outlets are formed in the front portion, the middle portion and the rear portion of the tank respectively, the immersed pump is connected with the lower liquid inlet pipe in an inlet mode, and the immersed pump outlet is connected with the upper liquid inlet pipe.
Through setting up immersed pump and last feed liquor pipe, formed a set of forced reflux unit and technology at the LNG transportation jar, the LNG of bottom in the transportation jar is by immersed pump suction, pumps the upper portion to the transportation jar through last feed liquor pipe, and the LNG density of bottom is big, and the LNG density on upper portion is little, forces the backward flow through the immersed pump, realizes the intensive mixing of LNG in the transportation jar.
Further, the immersed pump is arranged on the LNG transport tank, and the arranged height of the immersed pump is lower than that of the lower liquid inlet pipe.
The immersed pump is lower than the lower liquid inlet pipe in height, and after the valve of the lower liquid inlet pipe (liquid outlet pipe) is opened, the immersed pump is automatically filled with LNG, so that cavitation is not generated, and the stable operation of the pump is affected.
Further, the immersed pump is arranged on the LNG transport tank.
In one mode, a cold exchange tube is arranged in the cold trap bag.
Further, the cold exchange tube is arranged in a U-shaped bending mode in the cold trap bag.
Further, the cold exchange tube is immersed in liquid nitrogen in the cold trap bag.
Further, the cold exchange tube comprises an inlet and an outlet, the immersed pump outlet is connected with the cold exchange tube inlet, and the cold exchange tube outlet is connected with the upper liquid inlet tube.
LNG of bottom in the transportation jar is sucked by the immersed pump, enters the cold trap package and trades the cold back, and the upper portion of transportation jar is backward flow again, forces the backward flow through the immersed pump, realizes the intensive mixing of LNG in the transportation jar, strengthens trading cold to the LNG in jar through the cold trap package, makes LNG be in the supercooled state, reduces LNG and appears the risk of rolling, reduces the influence that the layering appears in LNG.
Further, the wave-proof plate includes first wave-proof plate and second wave-proof plate, first wave-proof plate fixed connection jar body spans the jar cross section, first wave-proof plate includes two at least, sets up side by side on the jar cross section, the both ends of second wave-proof plate are connected respectively and are fixed in on two first wave-proof plates, pack the clearance between the first wave-proof plate.
Further, the first wave-proof plate comprises an upper plate and a lower plate, a hanging seat is arranged on the lower plate of the first wave-proof plate, the upper end of the hanging seat is welded and fixed on the lower portion of the lower plate of the first wave-proof plate, and a lower liquid inlet pipe is fixed at the lower end of the hanging seat.
Further, the first wave-proof plate comprises an upper plate and a lower plate, the first wave-proof plate upper plate is provided with a supporting seat, the upper end of the supporting seat is welded and fixed on the upper portion of the first wave-proof plate upper plate, and an air outlet pipe is fixed at the upper end of the supporting seat.
Further, the first wave-proof plate comprises an upper plate and a lower plate, a through hole is formed in the upper portion of the first wave-proof plate, and the upper liquid inlet pipe penetrates through the through hole and then is supported and fixed.
Further, the second wave-proof plate is provided with a through hole, and the middle liquid inlet pipe penetrates through the through hole and then is supported and fixed.
Further, a spray head is arranged at the liquid outlet of the lower liquid inlet pipe, the spray head is of a hemispherical structure, and spray holes are formed in the surface of the spray head, so that the low-temperature liquid is sprayed in a hemispherical shape and is diffused to the periphery.
Further, a spray head is arranged at the liquid outlet at the tail end of the middle liquid inlet pipe, the spray head is of an ellipsoidal structure, and spray holes are formed in the surface of the spray head, so that the low-temperature liquid is sprayed in a spherical shape and is diffused to the periphery.
Further, a spray head is arranged at the liquid outlet at the tail end of the upper liquid inlet pipe, the spray head is of an ellipsoidal structure, and spray holes are formed in the surface of the spray head, so that the low-temperature liquid is sprayed in a spherical shape and is diffused to the periphery.
Further, a liquid outlet of the middle liquid inlet pipe is provided with a spray hole, and the spray hole is arranged around the upper liquid inlet pipe, so that the low-temperature liquid spray direction is diffused around the upper liquid inlet pipe.
Further, a liquid outlet of the upper liquid inlet pipe is provided with a spray hole, and the spray hole is arranged around the upper liquid inlet pipe, so that the low-temperature liquid spray direction is diffused around the upper liquid inlet pipe.
Further, the pore diameter of the spray hole is larger at the outer part and smaller at the inner part.
The aperture of the spray hole is arranged in a mode of small inside and large outside, so that the spray hole is favorable for dispersing the low-temperature liquid after being sprayed out, the concentrated spraying towards one point is avoided, and the cold stress of the low-temperature liquid on the tank is weakened.
Further, the liquid outlet of the middle liquid inlet pipe is arranged at the middle position of each separation area at the front part, the middle part and the rear part of the tank.
Further, the liquid outlet of the upper liquid inlet pipe is arranged at the middle position of each separation area at the front part, the middle part and the rear part of the tank.
The liquid outlet is arranged in the middle of each separation area at the front part, the middle part and the rear part of the tank, which is beneficial to uniformly dispersing the low-temperature liquid into the tank.
The beneficial effects are that:
1. According to the LNG transport tank, the cold trap package is arranged, and the cold medium filled in the cold trap package cools the LNG transport tank, so that LNG in the whole tank is in a relatively supercooled state, and even if the LNG in the tank is layered, severe rolling cannot be formed. Therefore, the safety valve of the BOG burst transport tank is not discharged to the outside, and the safety and the environment in the transport process are not affected.
2. According to the invention, a set of forced reflux device and process are formed in the LNG transportation tank by arranging the immersed pump and the upper liquid inlet pipe, LNG at the bottom in the transportation tank is pumped by the immersed pump and is pumped to the upper part of the transportation tank by the upper liquid inlet pipe, the density of LNG at the bottom is high, the density of LNG at the upper part is low, and the forced reflux of the immersed pump is realized, so that the full mixing of the LNG in the transportation tank is realized. The immersed pump is arranged on the LNG transport tank, the set height of the immersed pump is lower than that of the lower liquid inlet pipe, after the valve of the lower liquid inlet pipe (liquid outlet pipe) is opened, the immersed pump is automatically filled with LNG, and no cavitation exists to influence the stable operation of the pump.
3. According to the invention, the cold exchange tube is arranged in the cold trap bag, and is bent in a U shape in the cold trap bag, so that the cold exchange area is increased, the cold exchange tube is immersed in liquid nitrogen, LNG forcedly returned by the immersed pump is forcedly cooled, the LNG is in a supercooled state, the risk of rolling of the LNG is reduced, and the influence of layering of the LNG is reduced.
4. The middle liquid outlet pipe and the upper liquid outlet pipe are arranged in the middle of the tank, so that low-temperature liquid is uniformly dispersed from the middle of the tank to the periphery in the filling and forced backflow processes, and the tank is uniformly stressed by cold; the liquid outlets are arranged at the front part, the middle part and the rear part of the tank which are separated by the wave-proof plate, so that the cooling stress of each area of the tank is uniform, and the safety of the tank is enhanced.
5. According to the invention, the first wave-proof plate and the second wave-proof plate are combined, so that the single-channel effective area can easily exceed 70% of the cross section area of the tank body, and the wave-proof effect is good.
6. According to the invention, the supporting seat is arranged on the upper plate of the first wave-proof plate, the air outlet pipe is fixed by the supporting seat, the air outlet pipe is not in direct contact with the tank body, and is buffered by the wave-proof plate, so that the impact on collision, vibration and the like of the tank body is reduced; according to the invention, the upper plate of the first wave-proof plate is provided with the through holes, the upper liquid inlet pipe is supported and fixed, the upper liquid inlet pipe is not in direct contact with the tank body, and the impact on collision, vibration and the like of the tank body is reduced by buffering the wave-proof plate; according to the invention, the suspension seat is arranged on the lower plate of the first wave-proof plate, the suspension seat is used for fixing the lower liquid inlet pipe, the lower liquid inlet pipe is not in direct contact with the tank body, and the impact on collision, vibration and the like of the tank body is reduced by buffering the wave-proof plate; according to the invention, the second wave-proof plate is provided with the through holes, the middle liquid inlet pipe is supported and fixed, the middle liquid inlet pipe is not in direct contact with the tank body, and the impact on collision, vibration and the like of the tank body is reduced by buffering the wave-proof plate.
7. According to the invention, the liquid outlet of the lower liquid inlet pipe is provided with the spray nozzle, and the spray nozzle surface is provided with the spray holes, so that the low-temperature liquid spray direction is hemispherical and is diffused to the periphery, and the tank body is uniformly stressed by cold; according to the invention, the spray nozzle is arranged at the liquid outlet at the tail end of the middle liquid inlet pipe, and the spray hole is arranged on the surface of the spray nozzle, so that the spray direction of the low-temperature liquid is spherical and is diffused to the periphery, and the tank body is uniformly stressed by cold; according to the invention, the spray nozzle is arranged at the liquid outlet at the tail end of the upper liquid inlet pipe, and the spray hole is arranged on the surface of the spray nozzle, so that the spray direction of the low-temperature liquid is spherical and is diffused to the periphery, and the tank body is uniformly stressed by cold; according to the invention, the liquid outlets of the middle liquid inlet pipe and the upper liquid inlet pipe are provided with the spray holes, the spray holes surround the upper liquid inlet pipe, so that the low-temperature liquid is sprayed in a direction surrounding the upper liquid inlet pipe to spread around, and the diameter of the spray holes is large at the outer side and small at the inner side, so that the low-temperature liquid is prevented from being sprayed towards one point in a concentrated manner, and the tank body is uniformly stressed by cold.
8. According to the invention, the liquid outlets of the middle liquid inlet pipe and the upper liquid inlet pipe are arranged in the middle of each separation area at the front part, the middle part and the rear part of the tank, so that low-temperature liquid can be uniformly dispersed into the tank, and the tank body is uniformly stressed by cold; according to the invention, the liquid outlet of the lower liquid inlet pipe is arranged in the middle of each separation area at the front part, the middle part and the rear part of the tank, so that low-temperature liquid can be uniformly dispersed into the tank, and the tank body is uniformly stressed by cold.
Drawings
Fig. 1 is a schematic structural view of an LNG carrier tank of embodiment 1;
fig. 2 is a schematic structural view of an LNG carrier tank of embodiment 2;
fig. 3 is a schematic structural view of an LNG carrier tank of embodiment 3;
FIG. 4 is a schematic view of a wave shield structure;
FIG. 5 is a schematic view of the structure of the lower feed pipe nozzle;
FIG. 6 is a schematic diagram of the structure of the middle and upper feed pipes;
FIG. 7 is a schematic diagram of the structure of the middle liquid inlet pipe and the upper liquid inlet pipe spray hole;
Wherein, 1 pot; 2 wave-proof plates, 21 first wave-proof plate upper plates, 211 through holes, 212 supporting seats, 22 first wave-proof plate lower plates, 221 hanging seats, 23 second wave-proof plates and 231 through holes; 3 lower liquid inlet pipe, 31 liquid outlet, 311 spray hole; 4, a liquid inlet pipe, a liquid outlet port 41, a 411 spray hole, a 412 spray hole, a 42 liquid outlet port and a 421 spray hole; 5, a liquid inlet pipe, a liquid outlet port 51 and a liquid outlet port 52 are arranged; 6, an air outlet pipe and a 61 air outlet; 7, immersed pump; 8 cold trap bags, 81 cold exchange tube inlets, 82 cold exchange tube outlets.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
Example 1
As shown in fig. 1, an LNG carrier tank includes a cold trap 8, a wave-proof plate 2, liquid inlet pipes 3 and 4, and an air outlet pipe 6, where the cold trap 8 is disposed at the top of the LNG carrier tank 1, the wave-proof plate 2 separates the tank 1 into front, middle and rear regions, the liquid inlet pipe includes a lower liquid inlet pipe 3 and a middle liquid inlet pipe 4, the lower liquid inlet pipe 3 is disposed at the bottom of the tank 1, the middle liquid inlet pipe 4 is disposed in the middle of the tank 1, the air outlet pipe 6 is disposed at the upper portion of the tank 1, the lower liquid inlet pipe 3 is disposed with liquid outlets 31 in each region of the front, middle and rear of the tank, the middle liquid inlet pipe 4 is disposed with liquid outlets 41 and 42 in each region of the front, middle and rear of the tank, the 41 is a terminal liquid outlet of the middle liquid inlet pipe, and 42 is a non-terminal liquid outlet of the middle liquid inlet pipe, and the air outlet pipe 6 is disposed with air outlet 61 in each region of the front, middle and rear of the tank.
Viewed in the direction of the front view of fig. 1, the left side is the front of the tank, the right side is the rear of the tank, and the middle is the middle of the tank.
Compared with the traditional tank, the LNG transport tank is cooled by the cold trap bag 8 and the cold medium filled in the cold trap bag, so that LNG in the whole tank is in a relatively supercooled state, and even if the LNG in the tank is layered, severe rolling can not be formed. Therefore, the safety valve of the BOG burst transport tank is not discharged to the outside, and the safety and the environment in the transport process are not affected.
Compared with the traditional tank, the invention is beneficial to uniformly dispersing low-temperature liquid from the middle part of the tank to the periphery by arranging the middle liquid outlet pipe 4 at the middle part of the tank, so that the tank is uniformly stressed by cold.
Compared with the traditional tank, the invention ensures that the cooling stress of each area of the tank is uniform and the safety of the tank is enhanced by arranging the liquid outlets at the front part, the middle part and the rear part of the tank which are separated by the wave-proof plate.
Example 2
As shown in fig. 2, the LNG carrier tank further includes an upper liquid inlet pipe 5 and a immersed pump 7, the upper liquid inlet pipe 5 is disposed at the upper portion of the tank 1, the upper liquid inlet pipe 5 is provided with liquid outlets 51 and 52 in each of the front, middle and rear regions of the tank, 51 is a terminal liquid outlet of the middle liquid inlet pipe, 52 is a non-terminal liquid outlet of the middle liquid inlet pipe, the immersed pump 7 is connected with the lower liquid inlet pipe 3 in an inlet manner, the lower liquid inlet pipe 3 is simultaneously a liquid outlet pipe of the LNG carrier tank, and an outlet of the immersed pump 7 is connected with the upper liquid inlet pipe 5.
Through setting up immersed pump 7 and last feed liquor pipe 5, formed a set of forced reflux unit and technology at the LNG transport tank, the LNG of bottom in the transport tank is pumped by the immersed pump, pumps the upper portion to the transport tank through last feed liquor pipe, and the LNG density of bottom is big, and the LNG density on upper portion is little, forces the backward flow through the immersed pump, realizes the intensive mixing of LNG in the transport tank.
Further, the immersed pump 7 is arranged on the LNG transport tank, and the height of the immersed pump 7 is lower than that of the lower feed pipe 3. The immersed pump 7 is lower than the lower liquid inlet pipe 3 in height, and after the valve of the lower liquid inlet pipe (liquid outlet pipe) is opened, the immersed pump is automatically filled with LNG, so that cavitation does not exist, and the stable operation of the pump is affected.
Example 3
As shown in fig. 3, the cold trap 8 is filled with liquid nitrogen.
The LNG in the tank is cooled continuously under the conditions that the temperature of the LNG is 162 ℃ below zero and the temperature of the liquid nitrogen is 196 ℃ below zero and the liquid nitrogen exists in the cold trap bag, so that the LNG in the tank is in a relatively supercooled state.
Moreover, liquid nitrogen is inert, colorless, odorless, noncorrosive, nonflammable, and does not support combustion. If unexpected situations occur, such as leakage of LNG in a tank, liquid nitrogen in a cold trap bag can be used for spraying or jetting a leakage area, natural gas is cooled, pressed and diluted, and explosion accidents are prevented; for example, when a vehicle or a ship for transporting LNG accidentally catches fire, liquid nitrogen in the cold trap bag can be used for extinguishing fire, so that the safety of the LNG transport tank is prevented from being influenced.
The cold trap bag 8 is internally provided with a cold exchange tube which is arranged in a U-shaped bending way, so that the cold exchange area is increased, and the cold exchange tube is immersed in liquid nitrogen. The inlet of the immersed pump 7 is connected with the lower liquid inlet pipe 3, the lower liquid inlet pipe 3 is a liquid outlet pipe of the LNG transportation tank, the outlet of the immersed pump 7 is connected with the inlet 81 of the immersed pipe, and the outlet 82 of the immersed pipe is connected with the upper liquid inlet pipe 5.
LNG of bottom in the transportation jar is sucked by the immersed pump, enters the cold trap package and trades the cold back, and the upper portion of transportation jar is backward flow again, forces the backward flow through the immersed pump, realizes the intensive mixing of LNG in the transportation jar, strengthens trading cold to the LNG in jar through the cold trap package, makes LNG be in the supercooled state, reduces LNG and appears the risk of rolling, reduces the influence that the layering appears in LNG.
Example 4
As shown in fig. 4, the wave-proof plate of the tank comprises first wave-proof plates 21 and 22, wherein the first wave-proof plate 21 is a first wave-proof plate upper plate, the first wave-proof plate 22 is a first wave-proof plate lower plate, the wave-proof plate comprises a second wave-proof plate 23, the first wave-proof plates 21 and 22 are fixedly connected with the tank body and span across the section of the tank, the first wave-proof plate upper plate 21 and the first wave-proof plate lower plate 22 are arranged in parallel on the section of the tank, and two ends of the second wave-proof plate 23 are respectively connected and fixed with the first wave-proof plate upper plate 21 and the first wave-proof plate lower plate 22, so that a gap between the first wave-proof plate upper plate 21 and the first wave-proof plate lower plate 22 is filled.
In one mode, the first swash plate upper plate 21 is provided with a support base 212, the lower end of the support base 212 is welded and fixed on the upper portion of the first swash plate upper plate 21, and the upper end of the support base 212 is fixed with the air outlet pipe 6.
In one mode, a through hole 211 is formed in the upper portion of the first swash plate upper plate 21, and the upper liquid inlet pipe 5 penetrates through the through hole 211 and is supported and fixed.
In one mode, the lower plate 22 of the first swash plate is provided with a hanging seat 221, the upper end of the hanging seat 221 is welded and fixed on the lower part of the lower plate 22 of the first swash plate, and the lower end of the hanging seat 221 is fixed with a lower liquid inlet pipe 3.
In one mode, the second swash plate 23 is provided with a through hole 231, and the middle feed pipe 4 is supported and fixed after passing through the through hole 231.
One mode, LNG transport tank still includes backing plate, stand and backup pad, the backing plate shape suits with jar internal wall, backing plate and jar internal wall welded fastening, one end of stand with the backing plate welding, the shaft welded fastening backup pad of stand, the backup pad that belongs to is supported fixedly by two at least stands, first wave preventing plate with the backup pad is parallel pastes mutually, is provided with the through-hole in the backup pad, and first wave preventing plate passes through bolt, nut and backup pad fixed connection.
Example 5
As shown in fig. 5, the liquid outlet of the lower liquid inlet pipe is provided with a spray head 31, the spray head 31 has a hemispherical structure, and the surface of the spray head 31 is provided with spray holes 311, so that the low-temperature liquid spray direction is hemispherical and spreads to the periphery.
In one mode, the liquid outlet 31 is provided at the middle position of each of the divided areas of the front, middle and rear parts of the tank.
The liquid outlet is arranged in the middle of each separation area at the front part, the middle part and the rear part of the tank, which is beneficial to uniformly dispersing the low-temperature liquid into the tank.
As shown in fig. 6, a nozzle 41 is disposed at a liquid outlet at the end of the middle liquid inlet pipe, the nozzle 41 has an ellipsoidal structure, nozzle holes 411 and 412 are disposed on the surface of the nozzle 41, the spraying direction of the nozzle hole 411 is forward or upward or downward, the spraying direction of the nozzle hole 412 is backward, and the spraying direction of the nozzle 41 is in a spherical shape and spreads around.
When viewed in the direction of the front view of fig. 6, the liquid inlet pipe is arranged to be forward leftwards, the liquid inlet pipe is arranged to be backward rightwards, the liquid inlet pipe is arranged to be upward, and the liquid inlet pipe is arranged to be downward.
As shown in fig. 7, the liquid outlet 42 of the middle liquid inlet pipe is provided with a spray hole 421, and the spray hole 421 is arranged around the upper liquid inlet pipe, and the spray direction is the circumferential diffusion around the upper liquid inlet pipe.
One way is that the aperture of the nozzle 421 is larger at the outside and smaller at the inside.
The inside of the upper liquid inlet pipe is the inside, namely the inside of the upper liquid inlet pipe is the inside, and the outside of the upper liquid inlet pipe is the outside, when the direction of the figure 7 is seen in the front view.
The spray holes are arranged in a mode of small inside and large outside, so that low-temperature liquid is dispersed after being sprayed, concentrated spraying towards one point is avoided, and cold stress of the low-temperature liquid on the tank is weakened.
In one mode, the liquid outlet 42 is provided at the middle position of each of the divided regions of the front, middle and rear parts of the tank.
The liquid outlet is arranged in the middle of each separation area at the front part, the middle part and the rear part of the tank, which is beneficial to uniformly dispersing the low-temperature liquid into the tank.
In one mode, the liquid outlet 51 of the upper liquid inlet pipe is identical to the liquid outlet 41 of the middle liquid inlet pipe in structure.
In one manner, the outlet 52 of the upper inlet tube is identical in construction to the outlet 42 of the middle inlet tube.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (5)
1. The LNG transport tank is characterized by comprising a cold trap bag, a wave-proof plate, a liquid inlet pipe and an air outlet pipe, wherein the cold trap bag is arranged at the top of the LNG transport tank, the wave-proof plate divides the tank into a front area, a middle area and a rear area, the liquid inlet pipe comprises a lower liquid inlet pipe and a middle liquid inlet pipe, the lower liquid inlet pipe is arranged at the bottom of the tank, the middle liquid inlet pipe is arranged at the middle of the tank, the air outlet pipe is arranged at the upper part of the tank, the liquid outlet pipes are respectively arranged at the front area, the middle area and the rear area of the tank, the air outlet pipes are respectively provided with air outlets at the front area, the middle area and the rear area of the tank, the LNG transport tank further comprises an upper liquid inlet pipe and a immersed pump, the immersed pump is arranged on the LNG transport tank, the immersed pump is lower than the lower liquid inlet pipe, the upper liquid inlet pipe is arranged at the upper part of the tank, the upper liquid inlet pipe is provided with liquid outlets in the front part, the middle part and the rear part of the tank respectively, a cold exchange pipe is arranged in the cold trap bag and comprises an inlet and an outlet, the outlet of the immersed pump is connected with the inlet of the cold exchange pipe, the outlet of the cold exchange pipe is connected with the upper liquid inlet pipe, the wave-proof plates comprise a first wave-proof plate and a second wave-proof plate, the first wave-proof plate is fixedly connected with the tank body and spans across the section of the tank, the first wave-proof plates comprise an upper plate and a lower plate, the two ends of the second wave-proof plate are respectively connected and fixed on the two first wave-proof plates to fill a gap between the first wave-proof plates, the lower plate of the first wave-proof plate is provided with a hanging seat, the upper end of the hanging seat is welded and fixed on the lower part of the lower plate of the first wave-proof plate, and the lower liquid inlet pipe is fixed at the lower end of the hanging seat; the upper plate of the first wave-proof plate is provided with a supporting seat, the upper end of the supporting seat is welded and fixed on the upper part of the upper plate of the first wave-proof plate, and the upper end of the supporting seat is fixed with an air outlet pipe; the upper part of the first wave-proof plate upper plate is provided with a through hole, and the upper liquid inlet pipe penetrates through the through hole and then is supported and fixed; the second wave-proof plate is provided with a through hole, and the middle liquid inlet pipe penetrates through the through hole and then is supported and fixed.
2. The LNG carrier tank of claim 1 wherein the cold-exchange tube is U-folded within a cold trap package.
3. The LNG transport tank of claim 1, wherein the liquid outlet of the lower liquid inlet pipe is provided with a spray head, the spray head is of a hemispherical structure, and spray holes are formed in the surface of the spray head, so that the low-temperature liquid spray direction is hemispherical and spreads to the periphery; the liquid outlet at the tail end of the middle liquid inlet pipe is provided with a spray head, the spray head is of an ellipsoidal structure, and the surface of the spray head is provided with spray holes, so that the low-temperature liquid is sprayed in a spherical shape and is diffused to the periphery; the liquid outlet at the tail end of the upper liquid inlet pipe is provided with a spray head, the spray head is of an ellipsoidal structure, and the surface of the spray head is provided with spray holes, so that the low-temperature liquid is sprayed in a spherical shape and is diffused to the periphery; the liquid outlet of the middle liquid inlet pipe is provided with a spray hole, and the spray hole is arranged around the upper liquid inlet pipe, so that the low-temperature liquid spray direction is diffused around the upper liquid inlet pipe; the liquid outlet of the upper liquid inlet pipe is provided with spray holes, and the spray holes are arranged around the upper liquid inlet pipe, so that the low-temperature liquid spray direction is around the upper liquid inlet pipe to spread around; the pore diameter of the spray hole is larger at the outer part and smaller at the inner part.
4. The LNG carrier tank according to claim 1, wherein the liquid outlet of the middle liquid inlet pipe is provided at a middle position of each of the divided areas of the front, middle and rear of the tank; the liquid outlet of the upper liquid inlet pipe is arranged in the middle of each separation area at the front part, the middle part and the rear part of the tank.
5. LNG transfer tank according to any of claims 1-4, characterized in that the cold trap package is filled with liquid nitrogen.
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| CN201910455411.2A CN110131568B (en) | 2019-05-29 | 2019-05-29 | LNG transport tank |
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| CN201910455411.2A CN110131568B (en) | 2019-05-29 | 2019-05-29 | LNG transport tank |
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| CN110542016B (en) * | 2019-09-09 | 2021-03-16 | 浙江海洋大学 | LNG storage tank assembly |
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| CN210800693U (en) * | 2019-05-29 | 2020-06-19 | 江西制氧机有限公司 | LNG transport tank |
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| US9056325B2 (en) * | 2011-03-11 | 2015-06-16 | Shahn Torontow | Multi-nozzle misting shower head |
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| JP2003247697A (en) * | 2002-02-25 | 2003-09-05 | Kawasaki Shipbuilding Corp | Low-temperature liquefied gas agitating device and boat provided with it |
| KR20060006526A (en) * | 2004-07-16 | 2006-01-19 | 탱크테크 (주) | Device of spraying for fire extinguishing |
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Address after: 332000 Shiniu Jiangxi Jiujiang Development Zone, West Port Road No. 27 Applicant after: JIANGXI OXYGEN GENERATOR Co.,Ltd. Address before: 332000 No. 27 Shiniu Road, Xigang District, Gongqing Urban Development Zone, Jiujiang City, Jiangxi Province Applicant before: JIANGXI OXYGEN GENERATOR Co.,Ltd. |
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