BOG recovery device for LNG storage tank

Abstract

The utility model relates to the field of LNG (Liquefied Natural Gas) storage tanks and discloses a BOG (Boil Off Gas) recovery device for an LNG storage tank. The replacement part is arranged on the outer wall of the recycling barrel; the cooling part is arranged at the top of the replacement part; the air outlet pipeline is communicated with the bottom of the outer wall of the recycling barrel; and the base is fixedly connected to the bottom of the recycling barrel. The replacement part comprises an air inlet pipeline which is communicated and connected to the top of the outer wall of the recycling barrel, a replacement groove is formed in the outer wall of the air inlet pipeline, the shifting block is pressed downwards through the replacement part, so that the sliding block slides downwards along the track of the sliding groove, the shifting rod is pulled downwards under the assistance of the air inlet pipeline, and the clamping ring is driven to rotate around the shaft; the cooling plate is inserted into the cooling plate, the shifting block is loosened, and the sliding block rebounds under the acting force of the spring, so that the clamping ring is controlled to rotate around the shaft, the purpose of clamping connection of the clamping ring and the clamping groove block is achieved, and the effect of rapidly replacing the cooling plate is achieved.

Description

Technical Field

[0001] The utility model relates to the field of LNG storage tanks, in particular to a BOG recovery device for an LNG storage tank. Background Art

[0002] Since the daily evaporation rate of LNG in cryogenic storage tanks and cryogenic tank trucks is about 0.3%, this part of the evaporating gas (low temperature) is referred to as BOG flash steam, which increases the pressure of the gas phase space of the storage tank. In order to ensure the safety of the storage tank and the needs of loading and unloading vehicles, a storage tank safety pressure relief valve is set in the design (which can automatically discharge BOG according to the pressure during storage in the storage tank). The generated BOG gas passes through the vent valve to the BOG heater for heating, and then enters the BOG storage tank for storage. Since the cryogenic liquefied natural gas (LNG) storage tank (about -160℃) is invaded by the heat of the external environment, part of the mechanical energy of the submerged pump in the LNG tank is converted into heat energy when it is running, which will cause the LNG in the tank to gasify and produce flash steam, which is BOG.

[0003] In the current LNG storage tank, during the recovery and storage of BOG, the gas temperature is too high, which may cause burns and damage to the inner liner of the tank. Therefore, the gas is cooled before entering the tank. However, impurity particles occasionally enter the tank through the air inlet. Utility Model Content

[0004] The utility model aims to provide a BOG recovery device for an LNG storage tank, so as to achieve the purpose of solving the above-mentioned background technical problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a BOG recovery device for an LNG storage tank, comprising: a recovery cylinder; a displacement part arranged on the outer wall of the recovery cylinder; a cooling part arranged on the top of the displacement part; an air outlet pipe, which is connected to the bottom of the outer wall of the recovery cylinder; and a base, which is fixedly connected to the bottom of the recovery cylinder.

[0006] Preferably, the replacement part includes: an air intake pipe, which is connected to the top of the outer wall of the recovery cylinder, the outer wall of the air intake pipe is provided with a replacement groove, and the outer wall of the air intake pipe is provided with a slide groove; an electric baffle, which is fixedly connected between the inner walls of the air intake pipe.

[0007] Preferably, a cooling plate is slidably connected inside the replacement groove, the outer wall of the cooling plate is provided with filtering holes which are equidistantly arranged around the circumference, a handle is fixedly connected to the top of the cooling plate, and a slot block is fixedly connected to the top outer wall of the cooling plate.

[0008] Preferably, the outer wall of the air intake pipe is rotatably connected with a clamping ring through a shaft rod, the clamping ring is engaged and connected with the clamping groove block, and the top of the clamping ring is fixedly connected with a lever.

[0009] Preferably, a slider is slidably connected inside the slide groove, a spring is provided between the slider and the slide groove, one end of the spring is fixedly connected to the bottom of the slider, and the other end of the spring is fixedly connected to the bottom inner wall of the slide groove.

[0010] Preferably, a shift block is fixedly connected to the top of the slider, a connecting rod is provided between the shift block and the shift rod, one end of the connecting rod is fixedly connected to the top of the shift block, and the other end is rotatably connected to the top of the shift rod through a shaft.

[0011] Preferably, the cooling part includes: a water storage tank fixedly connected to the top of the air intake pipe; and a water pump fixedly connected to the top of the air intake pipe.

[0012] Preferably, the input end of the water pump is connected to the water tank, an output pipe is arranged between the water pump and the cooling plate, one end of the output pipe is connected to the output end of the water pump, and the other end is connected to the inside of the cooling plate, and an input pipe is connected between the water tank and the cooling plate.

[0013] The utility model provides a BOG recovery device for LNG storage tanks. It has the following beneficial effects:

[0014] (1) The utility model replaces the part and presses the shift block downward, so that the slider slides down along the track of the slide groove, and then the shift rod is pulled down with the assistance of the air intake pipe, thereby driving the card to rotate around the axis. The handle is held to insert the cooling plate into the interior of the cooling plate, and the shift block is loosened. Under the action of the spring, the slider rebounds, thereby controlling the card to rotate around the axis, so as to achieve the purpose of engaging and connecting the clamping ring and the card slot block, and achieving the effect of quickly replacing the cooling plate.

[0015] (2) The utility model drives the water pump through the cooling part, so that the water inside the water tank enters the cooling plate through the output pipe. Since the cooling plate is connected internally, the water enters the water tank through the input pipe, thereby achieving the effect of water circulation. Due to the appearance characteristics of the cooling plate, the effect of filtering impurity particles in the gas is achieved to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the main schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a front view of the overall structure of the utility model;

[0018] Figure 3 This is a view of the replacement part of the utility model;

[0019] Figure 4 This is a view of the cooling part of the utility model.

[0020] In the figure: 1 recovery cylinder, 2 replacement part, 3 cooling part, 4 air outlet pipe, 5 base;

[0021] 211 air intake duct, 212 electric baffle, 213 cooling plate, 214 handle, 215 card slot block, 216 snap ring, 217 lever, 218 slider, 219 spring, 220 lever block, 221 connecting rod;

[0022] 311 water storage tank, 312 water pump, 313 output pipe, 314 input pipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment 1

[0025] A preferred embodiment of the LNG storage tank BOG recovery device provided by the utility model is as follows Figure 1-4 As shown: a BOG recovery device for an LNG storage tank includes: a recovery cylinder 1; a replacement part 2 arranged on the outer wall of the recovery cylinder 1; a cooling part 3 arranged on the top of the replacement part 2; an air outlet pipe 4, which is connected to the bottom of the outer wall of the recovery cylinder 1; and a base 5, which is fixedly connected to the bottom of the recovery cylinder 1.

[0026] The replacement part 2 includes: an air intake pipe 211, which is connected to the top of the outer wall of the recovery tube 1, the outer wall of the air intake pipe 211 is provided with a replacement groove, and the outer wall of the air intake pipe 211 is provided with a slide groove; an electric baffle 212, which is fixedly connected between the inner walls of the air intake pipe 211.

[0027] A cooling plate 213 is slidably connected inside the replacement slot. The outer wall of the cooling plate 213 is provided with filtering holes which are equidistantly arranged around the circumference. A handle 214 is fixedly connected to the top of the cooling plate 213. A slot block 215 is fixedly connected to the top outer wall of the cooling plate 213.

[0028] The outer wall of the air intake pipe 211 is rotatably connected with a clamping ring 216 through a shaft, the clamping ring 216 is engaged and connected with the clamping groove block 215, and the top of the clamping ring 216 is fixedly connected with a lever 217.

[0029] A slider 218 is slidably connected inside the slide groove, and a spring 219 is provided between the slider 218 and the slide groove. One end of the spring 219 is fixedly connected to the bottom of the slider 218, and the other end is fixedly connected to the bottom inner wall of the slide groove.

[0030] A shift block 220 is fixedly connected to the top of the slider 218, and a connecting rod 221 is provided between the shift block 220 and the shift rod 217. One end of the connecting rod 221 is fixedly connected to the top of the shift block 220, and the other end is rotatably connected to the top of the shift rod 217 through an axle.

[0031] Furthermore, in this embodiment, by pressing down the shift block 220, the slider 218 slides down along the track of the slide groove, and thus with the assistance of the air intake pipe 211, the shift rod 217 is pulled down, thereby driving the retaining ring 216 to rotate around the axis, and the handle 214 is held to insert the cooling plate 213 into the interior of the cooling plate 213, and the shift block 220 is loosened. Under the action of the spring 219, the slider 218 rebounds, thereby controlling the retaining ring 216 to rotate around the axis, so as to achieve the purpose of engaging and connecting the retaining ring 216 with the slot block 215, and achieving the effect of quickly replacing the cooling plate 213. Embodiment 2

[0032] Based on Example 1, a preferred embodiment of a LNG storage tank BOG recovery device provided by the utility model is as follows: Figure 1-4 As shown: the cooling part 3 includes: a water storage tank 311, which is fixedly connected to the top of the air intake pipe 211; and a water pump 312, which is fixedly connected to the top of the air intake pipe 211.

[0033] The input end of the water pump 312 is connected to the water tank 311, and an output pipe 313 is arranged between the water pump 312 and the cooling plate 213. One end of the output pipe 313 is connected to the output end of the water pump 312, and the other end is connected to the inside of the cooling plate 213. An input pipe 314 is connected between the water tank 311 and the cooling plate 213.

[0034] Furthermore, this embodiment drives the water pump 312 to allow the water inside the water tank 311 to enter the cooling plate 213 through the output pipe 313. Since the cooling plate 213 is internally connected, the water then enters the water tank 311 through the input pipe 314, thereby achieving the effect of water circulation. Due to the appearance characteristics of the cooling plate 213, the effect of filtering impurity particles in the gas is achieved to a certain extent.

[0035] When in use, first, press down the shift block 220 to make the slider 218 slide down along the track of the slide groove, so that with the assistance of the air intake pipe 211, pull the shift rod 217 downward, thereby driving the clamping ring 216 to rotate around the axis, hold the handle 214, insert the cooling plate 213 into the interior of the cooling plate 213, loosen the shift block 220, and under the action of the spring 219, make the slider 218 rebound, thereby controlling the clamping ring 216 to rotate around the axis, so that the clamping ring 216 and the slot block 215 are engaged and connected, and the effect of quickly replacing the cooling plate 213 is achieved; secondly, drive the water pump 312 to make the water inside the water storage tank 311 enter the cooling plate 213 through the output pipe 313. Since the cooling plate 213 is internally connected, the water enters the water storage tank 311 through the input pipe 314 to achieve the effect of water circulation. Due to the appearance characteristics of the cooling plate 213, the effect of filtering impurity particles in the gas is achieved to a certain extent.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A BOG recovery device for an LNG storage tank, characterized in that: include: Recovery bin (1); A replacement portion (2) disposed on the outer wall of the recovery cylinder (1); A cooling portion (3) disposed on top of the replacement portion (2); An air outlet pipe (4) is connected to the bottom of the outer wall of the recovery cylinder (1); The base (5) is fixedly connected to the bottom of the recovery cylinder (1).

2. The LNG storage tank BOG recovery device according to claim 1, characterized in that: The replacement part (2) includes: An air intake pipe (211) is connected to the top of the outer wall of the recovery cylinder (1), a replacement groove is provided on the outer wall of the air intake pipe (211), and a sliding groove is provided on the outer wall of the air intake pipe (211); The electric baffle (212) is fixedly connected between the inner walls of the air intake pipe (211).

3. The LNG storage tank BOG recovery device according to claim 2, characterized in that: A cooling plate (213) is slidably connected inside the replacement groove, and filtering holes are provided on the outer wall of the cooling plate (213) and are arranged equidistantly around the circumference. A handle (214) is fixedly connected to the top of the cooling plate (213), and a slot block (215) is fixedly connected to the outer wall of the top of the cooling plate (213).

4. The LNG storage tank BOG recovery device according to claim 2, characterized in that: The outer wall of the air intake pipe (211) is rotatably connected to a clamping ring (216) via a shaft rod; the clamping ring (216) is clamped and connected to the clamping groove block (215); and a lever (217) is fixedly connected to the top of the clamping ring (216).

5. The LNG storage tank BOG recovery device according to claim 2, characterized in that: A slider (218) is slidably connected inside the slide groove, a spring (219) is provided between the slider (218) and the slide groove, one end of the spring (219) is fixedly connected to the bottom of the slider (218), and the other end is fixedly connected to the bottom inner wall of the slide groove.

6. The LNG storage tank BOG recovery device according to claim 5, characterized in that: A shift block (220) is fixedly connected to the top of the slider (218); a connecting rod (221) is provided between the shift block (220) and the shift rod (217); one end of the connecting rod (221) is fixedly connected to the top of the shift block (220); and the other end is rotatably connected to the top of the shift rod (217) via a shaft.

7. The LNG storage tank BOG recovery device according to claim 1, characterized in that: The cooling part (3) comprises: A water storage tank (311) is fixedly connected to the top of the air intake pipe (211); The water pump (312) is fixedly connected to the top of the air intake pipe (211).

8. The LNG storage tank BOG recovery device according to claim 7, characterized in that: The input end of the water pump (312) is connected to the water storage tank (311); an output pipe (313) is provided between the water pump (312) and the cooling plate (213); one end of the output pipe (313) is connected to the output end of the water pump (312), and the other end is connected to the inside of the cooling plate (213); an input pipe (314) is connected between the water storage tank (311) and the cooling plate (213).

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