阅读说明：本技术 一种lng罐式集装箱bog回收系统 (BOG (boil off gas) recovery system of LNG (liquefied natural gas) tank container ) 是由 郑志 吕艳丽 于 2019-10-11 设计创作，主要内容包括：本发明公开了一种LNG罐式集装箱BOG回收系统,包括罐式集装箱,所述罐式集装箱的侧壁设有出料装置,所述罐式集装箱的侧壁固定连接有套管,所述套管的侧壁螺纹密封连接有收集槽,所述收集槽的底壁开设有排气孔,所述收集槽远离罐式集装箱的侧壁密封连接有与排气孔匹配的供气管道,所述供气管道上设有第一阀门,所述供气管道远离收集槽的一端设有密封箱,所述密封箱的上端侧壁固定连接有壳体,所述壳体为中空结构,所述壳体的上端内壁通过驱动机构连接有两个升降杆。本发明能够更加彻底地将BOG排入液氮存储箱中进行液化,避免BOG浪费,并保护环境,同时利用密封板压缩BOG进行加压和预热,以提高液化速率和效率,并节约能源。(The invention discloses a BOG (boil off gas) recovery system of an LNG (liquefied natural gas) tank container, which comprises the tank container, wherein a discharging device is arranged on the side wall of the tank container, a sleeve is fixedly connected to the side wall of the tank container, a collecting tank is in threaded sealing connection with the side wall of the sleeve, an exhaust hole is formed in the bottom wall of the collecting tank, the side wall of the collecting tank, which is far away from the tank container, is in sealing connection with a gas supply pipeline matched with the exhaust hole, a first valve is arranged on the gas supply pipeline, a sealing box is arranged at one end, which is far away from the collecting tank, of the gas supply pipeline, the side wall of the upper end of the sealing box. The invention can more thoroughly discharge BOG into the liquid nitrogen storage tank for liquefaction, thereby avoiding BOG waste and protecting the environment, and meanwhile, the sealing plate is utilized to compress BOG for pressurization and preheating, thereby improving the liquefaction rate and efficiency and saving energy.)

1. The BOG recovery system of the LNG tank container comprises a tank container (1) and is characterized in that a discharging device (2) is arranged on the side wall of the tank container (1), a sleeve (3) is fixedly connected to the side wall of the tank container (1), a collecting tank (4) is connected to the side wall of the sleeve (3) in a threaded sealing manner, an exhaust hole is formed in the bottom wall of the collecting tank (4), a gas supply pipeline (5) matched with the exhaust hole is connected to the side wall of the collecting tank (4) in a sealing manner, a first valve (6) is arranged on the gas supply pipeline (5), a sealing box (7) is arranged at one end of the gas supply pipeline (5) far away from the collecting tank (4), a shell (8) is fixedly connected to the side wall of the upper end of the sealing box (7), the shell (8) is of a hollow structure, and the inner wall of the upper end of the shell (8) is connected, the two lifting rods (10) penetrate through the inner wall of the lower end of the shell (8) and the side wall of the upper end of the sealing box (7), a sealing plate (11) is fixedly connected between the side walls of the lower ends of the two lifting rods (10) in the sealing box (7), the side wall of the sealing plate (11) is abutted against the inner wall of the sealing box (7), a friction mechanism (12) is fixedly connected with the side wall of the lower end of the sealing box (7), an air duct (13) is arranged on the side wall of the lower end of the sealing box (7), a second valve (14) is arranged on the air duct (13), a liquid nitrogen storage box (15) is arranged at one end, far away from the sealing box (7), of the air duct (13), the liquid nitrogen penetrates through the storage box (15) in a sealing mode and is connected with a spiral tube (16), one end, far away from the air duct (13), of the spiral tube (16) penetrates through the inner wall of the liquid, and a third valve (18) is arranged on the return pipe (17).

2. The BOG recovery system for LNG tank containers of claim 1, the driving mechanism (9) comprises a driving motor (901), the driving motor (901) is fixedly connected with the inner wall of the upper end of the shell (8), the output shaft of the driving motor (901) is fixedly connected with a ball screw (902), a sliding block (903) matched with the ball screw (902) is sleeved on the ball screw (902) in a sliding manner, a plurality of limiting rods (904) are fixedly connected between the upper inner wall and the lower inner wall of the shell (8), the limiting rods (904) are respectively positioned at two sides of the ball screw (902) and symmetrically arranged, the limiting rods (904) penetrate through the sliding block (903), the side wall of the sliding block (903) far away from the driving motor (901) is fixedly connected with the side wall of the upper end of each lifting rod (10), and the two lifting rods (10) are respectively positioned on two sides of the ball screw (902) symmetrically.

3. The BOG recovery system for the LNG tank container as claimed in claim 1, wherein the friction mechanism (12) comprises a deformation air bag (1201), the deformation air bag (1201) is fixedly connected with the lower end side wall of the sealing plate (11), both side walls of the deformation air bag (1201) are fixedly connected with mounting seats (1202), the side wall of the mounting seat (1202) far away from the deformation air bag (1201) is rotatably connected with a swing rod (1204) through a torsion spring (1203), one end of the swing rod (1204) far away from the torsion spring (1203) is fixedly connected with a first friction plate (1205), and the lower end side wall of the sealing plate (11) is fixedly connected with a plurality of second friction plates (1206) matched with the first friction plate (1205) through a plurality of return springs (1207).

4. BOG recovery system for LNG tank containers, according to claim 1, characterized in that the side wall of the liquid nitrogen storage tank (15) is provided with a feeding pipe (19), the feeding pipe (19) is provided with a feeding valve (20), the side wall of the liquid nitrogen storage tank (15) far away from the feeding pipe (19) is provided with a discharging pipe (21), and the discharging pipe (21) is provided with a discharging valve (22).

5. The BOG recycling system of the LNG tank container as claimed in claim 1, wherein a plurality of air holes are formed in the upper side wall of the sealing box (7), the plurality of air holes are distributed in an annular array, and an annular mesh plate (23) matched with the plurality of air holes is fixedly connected to the upper side wall of the sealing box (7).

6. The BOG recycling system of the LNG tank container as claimed in claim 3, wherein two baffles (24) are fixedly connected to both side walls of the second friction plate (1206), the side walls of the two baffles (24) close to the first friction plate (1205) are wrapped with buffer pads, and the side wall of the first friction plate (1205) close to the second friction plate (1206) is convex.

7. The BOG recovery system for the LNG tank container according to claim 1, wherein a base plate (27) is fixedly connected to a lower side wall of the liquid nitrogen storage tank (15) through a plurality of buffer springs (26), and a rubber pad (28) is wrapped on a side wall of the base plate (27) far away from the buffer springs (26).

8. The BOG recovery system for the LNG tank container as claimed in claim 1, wherein the collecting tank (4) is provided with a cavity filled with an insulation material (29), the insulation material (29) is composed of a mixture of glass fiber, asbestos and rock wool, and the side wall of the collecting tank is wrapped with an insulation pad (25).

Technical Field

The invention relates to the technical field of BOG recovery, in particular to a BOG recovery system of an LNG tank container.

Background

LNG is the English abbreviation for Liquefied Natural Gas (LNG) Liquefied Natural Gas (Natural Gas). The major component is methane. The LNG is colorless, odorless, nontoxic and noncorrosive, the volume of the LNG is about 1/625 of the volume of the same amount of gaseous natural gas, the weight of the LNG is only about 45% of the same volume of water, the critical temperature of the LNG between gas and liquid of the LNG under the normal pressure state is-162 ℃, and the LNG is condensed into liquid by cooling the gaseous natural gas under the normal pressure to-162 ℃. The liquefied natural gas can greatly save storage and transportation space, and has the characteristics of large heat value, high performance and the like, and the LNG is clean and efficient energy. Since the imported LNG contributes to the energy consumption country to realize diversification of energy supply and guarantee energy safety, and the exported LNG contributes to the natural gas producing country to effectively develop natural gas resources, increase foreign exchange income and promote national economic development, LNG trade is becoming a new hotspot in the global energy market;

BOG is an acronym for Boil Off Gas, which is a low-temperature liquid obtained by liquefying a Gas under pressure at a temperature lower than its critical temperature, and is a Gas that evaporates by absorbing external heat because it is difficult to insulate absolutely from the environment. Liquefied natural gas is extremely easy to vaporize at normal temperature, and even under the condition that the low-temperature storage tank of the liquefied natural gas has good heat insulation performance, the liquefied natural gas in the low-temperature storage tank is inevitably vaporized, so that BOG is formed. In order to avoid the waste of liquefied natural gas and reduce the influence of natural gas emission on the atmospheric environment, the boil-off gas of the liquefied natural gas needs to be recovered.

Disclosure of Invention

The invention aims to solve the problems that in the prior art, when BOG is recovered, the BOG is generally injected into a liquid nitrogen storage tank in an automatic BOG flowing mode, the BOG is reformed into liquid and flows back through the low temperature of liquid nitrogen, but the BOG recovered in the mode is limited, some BOG can be left in a pipeline to cause waste, and in the recovery process, an additional heating device such as an air temperature heater is required to be adopted to heat the BOG, so that the energy waste is caused, and the recovery cost is increased.

In order to achieve the purpose, the invention adopts the following technical scheme:

an LNG tank container BOG recovery system comprises a tank container, wherein the side wall of the tank container is provided with a discharging device, the side wall of the tank container is fixedly connected with a sleeve, the side wall of the sleeve is in threaded sealing connection with a collecting tank, the bottom wall of the collecting tank is provided with an exhaust hole, the side wall of the collecting tank far away from the tank container is in sealing connection with an air supply pipeline matched with the exhaust hole, the air supply pipeline is provided with a first valve, one end of the air supply pipeline far away from the collecting tank is provided with a seal box, the upper end side wall of the seal box is fixedly connected with a shell, the shell is of a hollow structure, the upper end inner wall of the shell is connected with two lifting rods through a driving mechanism, the two lifting rods penetrate through the lower end inner wall of the shell and the upper end side wall of the, the lateral wall of closing plate offsets with the inner wall of seal box, the lower extreme lateral wall fixedly connected with friction mechanism of seal box, the lower extreme lateral wall of seal box is equipped with the air duct, be equipped with the second valve on the air duct, the one end that the seal box was kept away from to the air duct is equipped with the liquid nitrogen storage box, the sealed liquid nitrogen storage box and the sealing connection of running through of air duct have a spiral pipe, the sealed inner wall and the sealing connection that runs through the liquid nitrogen storage box of the one end that the air duct was kept away from to the spiral pipe have the back flow that matches with tank container.

Preferably, actuating mechanism includes driving motor, the upper end inner wall fixed connection of driving motor and casing, driving motor's output shaft fixedly connected with ball, sliding sleeve is equipped with the sliding block rather than matching on the ball, a plurality of gag lever posts of fixedly connected with between the upper and lower inner wall of casing, it is a plurality of the gag lever post is located ball's bilateral symmetry respectively and sets up, and is a plurality of the gag lever post all runs through the sliding block, driving motor's lateral wall and the upper end lateral wall fixed connection of lifter, two are kept away from to the sliding block the lifter is located ball's bilateral symmetry respectively.

Preferably, the friction mechanism includes the deformation gasbag, the lower extreme lateral wall fixed connection of deformation gasbag and closing plate, the equal fixedly connected with mount pad of both sides lateral wall of deformation gasbag, the lateral wall that deformation gasbag was kept away from to the mount pad is connected with the swinging arms through torsion spring rotation, torsion spring's the first friction disc of one end fixedly connected with is kept away from to the swinging arms, the lower extreme lateral wall of closing plate is through a plurality of second friction discs that match with first friction disc of a plurality of reset spring fixedly connected with.

Preferably, the lateral wall of liquid nitrogen storage box is equipped with the inlet pipe, be equipped with the feed valve on the inlet pipe, the lateral wall that the inlet pipe was kept away from to the liquid nitrogen storage box is equipped with the discharging pipe, be equipped with the bleeder valve on the discharging pipe.

Preferably, a plurality of bleeder vents are opened to the upper end lateral wall of seal box, and are a plurality of the bleeder vent is annular array distribution, the upper end lateral wall fixedly connected with of seal box and the annular otter board that a plurality of bleeder vents match.

Preferably, the lateral wall of both sides of second friction disc is two baffle of equal fixedly connected with, two the lateral wall that the baffle is close to first friction disc all wraps up the blotter, the lateral wall that first friction disc is close to the second friction disc is the convex surface setting.

Preferably, the side wall of the lower end of the liquid nitrogen storage box is fixedly connected with a base plate through a plurality of buffer springs, and the side wall of the base plate, far away from the buffer springs, is wrapped with a rubber pad.

Preferably, a cavity is formed in the collecting tank, a heat-insulating material is filled in the cavity, the heat-insulating material is composed of a mixture of glass fiber, asbestos and rock wool, and a heat-insulating pad is wrapped on the side wall of the accommodating tank.

Compared with the prior art, the invention has the beneficial effects that:

1. the sealing plate can be driven to lift through the cooperation of the lifting rod and the like, so that BOG is concentrated in the sealing box and then is completely squeezed into the liquid nitrogen storage box for liquefaction, the BOG gas can be completely liquefied again, the speed and the efficiency are high, meanwhile, the gas at the lower part of the sealing box can be compressed when the sealing plate moves, the gas pressure is increased, the gas is preheated, the liquefaction speed and the efficiency are improved, and meanwhile, the energy is saved;

2. the ball screw is driven to rotate forwards and backwards through the driving motor, and the sliding block can slide up and down under the limitation of the limiting rod, so that the lifting rod and the sealing plate are driven to lift, gas below the sealing plate can be squeezed into the liquid nitrogen storage box for liquefaction, convenience and practicability are realized, BOG can be completely squeezed, and the efficiency is improved;

3. when the sealing plate moves, the lower part of the sealing plate is in a sealing state, the air pressure changes along with the sealing state, the deformation air bag expands or contracts when the air pressure changes, so that the mounting seat is driven to move, the first friction plate can be always abutted against the second friction plate under the action of the rebounding force of the torsion spring, the change of the deformation air bag can be utilized to drive the swing rod to move, so that the first friction plate and the second friction plate generate heat through friction, the BOG is further preheated, and the liquefaction efficiency of the BOG is ensured;

4. liquid nitrogen can be quickly injected into the liquid nitrogen storage box and discharged by utilizing the matching of the feeding pipe, the feeding valve, the discharging pipe and the discharging valve, so that time and labor are saved;

5. the lifting rod can conveniently and stably drive the sealing plate to move through the air holes, and meanwhile, the air holes can be blocked by utilizing the annular net plate, so that dust is prevented from entering the upper part of the sealing box through the air holes, and the cleanness of the sealing box and the sealing plate is ensured;

6. the first friction plate can be blocked by the baffle plate, so that the first friction plate is prevented from being separated from the second friction plate, heat can be stably generated by friction, and meanwhile, the collision between the baffle plate and the first friction plate is reduced by the aid of the cushion pad;

7. the liquid nitrogen storage box can buffer the shaking of the liquid nitrogen storage box by utilizing the matching of the buffer spring, the base plate and the rubber pad, so that the liquid nitrogen is prevented from being evaporated due to heat energy generated by violent shaking, and the liquid nitrogen is saved;

8. the discharging device can be insulated by utilizing the cavity and the heat insulation material, so that the occurrence of BOG is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a BOG recovery system for an LNG tank container according to the present invention;

FIG. 2 is a schematic view of the structure at A in FIG. 1;

FIG. 3 is a schematic view of the structure at B in FIG. 1;

FIG. 4 is a schematic view of the structure at C in FIG. 1;

FIG. 5 is a schematic view of the structure of FIG. 1 at D;

fig. 6 is a schematic structural diagram at E in fig. 1.

In the figure: 1 tank container, 2 discharging devices, 3 sleeves, 4 collecting tanks, 5 gas supply pipelines, 6 first valves, 7 sealing boxes, 8 shells, 9 driving mechanisms, 901 driving motors, 902 ball screws, 903 sliding blocks, 904 limiting rods, 10 lifting rods, 11 sealing plates, 12 friction mechanisms, 1201 deformation air bags, 1202 installation seats, 1203 torsion springs, 1204 swinging rods, 1205 first friction plates, 1206 second friction plates, 1207 reset springs, 13 gas guide pipes, 14 second valves, 15 liquid nitrogen storage tanks, 16 spiral pipes, 17 return pipes, 18 third valves, 19 feeding pipes, 20 feeding valves, 21 discharging pipes, 22 discharging valves, 23 annular net plates, 24 baffle plates, 25 heat-insulating cushions, 26, buffer springs, 27 base plates, 28 rubber cushions and 29 heat-insulating materials.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-6, a LNG tank container BOG recovery system, including a tank container 1, a discharge device 2 is disposed on a side wall of the tank container 1, a sleeve 3 is fixedly connected to the side wall of the tank container 1, a collecting tank 4 is hermetically connected to a side wall thread of the sleeve 3, a cavity is opened in the collecting tank 4, a thermal insulation material 29 is filled in the cavity, the thermal insulation material 29 is composed of a mixture of glass fiber, asbestos, and rock wool, a thermal insulation pad 25 is wrapped on the side wall of the collecting tank, the discharge device 2 can be thermally insulated by using the cavity and the thermal insulation material 29, thereby reducing BOG, an exhaust hole is disposed on a bottom wall of the collecting tank 4, a gas supply pipeline 5 matched with the exhaust hole is hermetically connected to the side wall of the collecting tank 4, a first valve 6 is disposed on the gas supply pipeline 5, a seal box 7 is, the side wall of the upper end of the sealing box 7 is provided with a plurality of air holes which are distributed in an annular array, the side wall of the upper end of the sealing box 7 is fixedly connected with an annular net plate 23 matched with the air holes, the lifting rod 10 can conveniently and stably drive the sealing plate 11 to move through the air holes, meanwhile, the air holes can be blocked by the annular net plate 23, dust is prevented from entering the upper part of the sealing box 7 through the air holes, and the cleanness of the sealing box 7 and the sealing plate 11 is ensured;

the upper end side wall of the seal box 7 is fixedly connected with a shell 8, the shell 8 is of a hollow structure, the upper end inner wall of the shell 8 is connected with two lifting rods 10 through a driving mechanism 9, the driving mechanism 9 comprises a driving motor 901, the driving motor 901 is fixedly connected with the upper end inner wall of the shell 8, an output shaft of the driving motor 901 is fixedly connected with a ball screw 902, the ball screw 902 is slidably sleeved with a sliding block 903 matched with the ball screw 902, a plurality of limiting rods 904 are fixedly connected between the upper inner wall and the lower inner wall of the shell 8, the limiting rods 904 are respectively positioned at two sides of the ball screw 902 and symmetrically arranged, the limiting rods 904 all penetrate through the sliding block 903, the side wall of the sliding block 903 far away from the driving motor 901 is fixedly connected with the upper end side wall of the lifting rods 10, the two lifting rods 10 are respectively positioned at two sides of the ball screw 902 and symmetrically arranged, a sealing plate 11 is fixedly connected between the lower end side walls of two lifting rods 10 in a sealing box 7, the side walls of the sealing plate 11 abut against the inner wall of the sealing box 7, a friction mechanism 12 is fixedly connected with the lower end side wall of the sealing box 7, the friction mechanism 12 comprises a deformation air bag 1201, the deformation air bag 1201 is fixedly connected with the lower end side wall of the sealing plate 11, the side walls of the two sides of the deformation air bag 1201 are fixedly connected with an installation seat 1202, the side wall of the installation seat 1202 far away from the deformation air bag 1201 is rotatably connected with a swing rod 1204 through a torsion spring 1203, one end of the swing rod 1204 far away from the torsion spring 1203 is fixedly connected with a first friction plate 1205, and the lower end side wall of the sealing plate 11 is fixedly connected with a plurality of second friction plates 1206;

the two side walls of the second friction plate 1206 are fixedly connected with two baffle plates 24, the side walls of the two baffle plates 24 close to the first friction plate 1205 are wrapped with buffer pads, the side wall of the first friction plate 1205 close to the second friction plate 1206 is arranged in a convex surface manner, the first friction plate 1205 can be blocked by the baffle plates 24, the first friction plate 1205 is prevented from being separated from the second friction plate 1206, heat generated by friction can be stably generated, meanwhile, the buffer pads are also used for reducing the collision between the baffle plates 24 and the first friction plate 1205, the side wall of the lower end of the seal box 7 is provided with a gas guide pipe 13, the gas guide pipe 13 is provided with a second valve 14, one end of the gas guide pipe 13 far away from the seal box 7 is provided with a liquid nitrogen storage box 15, the side wall of the lower end of the liquid nitrogen storage box 15 is fixedly connected with a base plate 27 through a plurality of buffer springs 26, the side wall of the base plate, so that the liquid nitrogen can not shake violently, thereby avoiding the liquid nitrogen from evaporating due to the heat energy generated by shaking, saving the liquid nitrogen, the side wall of the liquid nitrogen storage box 15 is provided with a feeding pipe 19, the feeding pipe 19 is provided with a feeding valve 20, the side wall of the liquid nitrogen storage box 15 far away from the feeding pipe 19 is provided with a discharging pipe 21, the discharging pipe 21 is provided with a discharging valve 22, by utilizing the feeding pipe 19 and the feeding valve 20, discharging pipe 21 and bleeder valve 22's cooperation can pour into the liquid nitrogen into liquid nitrogen storage box 15 with the liquid nitrogen fast and discharge, time saving and labor saving, save time, air duct 13 is sealed to run through liquid nitrogen storage box 15 and sealing connection has spiral pipe 16, the area of contact of increase and liquid nitrogen, improve the liquefaction speed, the sealed inner wall that runs through liquid nitrogen storage box 15 and sealing connection have the back flow 17 that matches with tank container 1 of the one end that air duct 13 was kept away from to spiral pipe 16, be equipped with third valve 18 on the back flow 17.

When BOG appears in the tank container 1, the BOG is blocked by the collecting tank 4, thereby avoiding the adverse effect on the environment caused by the direct discharge of the BOG into the atmosphere, and simultaneously collecting the BOG by the collecting tank 4, then, the driving motor 901 can drive the ball screw 902 to move, and the sliding block 903 can slide downwards under the action of the limiting rod 904, the slide block 903 can drive the lifting rod 10 to descend, so that the sealing plate 11 descends until the sealing plate 11 descends to the bottom of the sealing box 7, then the first valve 6 is opened, the driving motor 901 drives the sliding block 903 and the lifting rod 10 to ascend, in this way, the sealing plate 11 can increase the volume below the sealing box 7 during the lifting process, and reduce the pressure, thereby sucking the BOG in the collecting tank 4 into the sealing box 7, then the first valve 6 is closed, the sealing plate 11 is used for descending again, and the BOG can be squeezed into the liquid nitrogen storage tank 15;

meanwhile, when the sealing plate 11 descends, the sealing box 7 below the sealing plate 11 can be pressurized, after the air pressure is increased, the temperature below the sealing plate 11 rises, so that the BOG is preheated, when the air pressure at the lower end of the sealing box 7 changes, the lower side of the sealing plate 11 is in a sealing state, the air pressure changes accordingly, when the air pressure changes, the deformation air bag 1201 expands or contracts, so that the mounting seat 1202 is driven to move, the first friction plate 1205 can be always abutted against the second friction plate 1206 under the action of the counter-elastic force of the torsion spring 1203, so that the change of the deformation air bag 1201 can be used for driving the swing rod 1204 to move, so that the first friction plate 1205 and the second friction plate 1206 are subjected to friction heating, the BOG is further preheated, and the liquefaction efficiency of the BOG is ensured;

through BOG who preheats along air duct 13 and second valve 14 back in getting into liquid nitrogen storage box 15, the effect that receives the liquid nitrogen can turn into gas into liquid, thereby in flowing into tank container 1 along back flow 17, moreover, the steam generator is simple in structure, can carry out thorough conversion to BOG fast, utilize volume change pressurization heating simultaneously, preheat, utilize the friction of first friction disc 1205 and second friction disc 1206 to preheat, the liquefaction effect of BOG is improved, moreover, the steam generator is simple in structure, therefore, the clothes hanger is strong in practicability, and the cost can be greatly saved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.