B0G recycling system of LNG (Liquefied Natural Gas) filling station

Abstract

The utility model discloses a B0G recycling system of an LNG (Liquefied Natural Gas) filling station, which is characterized in that a BOG buffer tank, a BOG storage tank and an air temperature type gasifier are arranged on the upper surface of an upper-layer platform, an internal combustion engine generator set, a waste heat recovery heat exchanger and an activated carbon filter are arranged on the upper surface of a bottom frame, and the air temperature type gasifier is connected with a vent nozzle of the LNG storage tank; the air temperature type gasifier is connected with the BOG buffer tank, the BOG buffer tank is connected with the BOG storage tank, the BOG storage tank is connected with the internal combustion engine generator set, a waste gas exhaust port of the internal combustion engine generator set is connected with a gas channel of the waste heat recovery heat exchanger, and a gas channel of the waste heat recovery heat exchanger is connected with the activated carbon filter. And the BOG storage tank is additionally arranged between the BOG buffer tank and the internal combustion engine generator set, so that the situation that the working time of the internal combustion engine generator set is too short due to too small storage amount is avoided, waste gas subjected to heat exchange enters the activated carbon filter, and it is guaranteed that exhaust of the waste gas cannot affect the environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to BOG recycling technical field, concretely is a kind of B0G recycling system of LNG gas station. BACKGROUND

[0002] When LNG (liquefied natural gas) gas station operates, due to the heat leakage of LNG cryogenic storage tank, pipeline heat transfer, heat generation of tank internal submerged pump and other reasons, LNG in storage tank will be gasified to produce BOG (methane flash steam). Generally, to ensure the safety of storage tank and the needs of loading and unloading vehicle, according to the pressure during storage, BOG is automatically discharged through safety pressure reducing valve. However, this kind of treatment method, on the one hand, causes waste of energy, leading to economic loss, on the other hand, also causes environmental pollution. The direct compression process is commonly used in BOG treatment method, which requires city gas pipe network beside gas station or must be L-CNG gas station, but most gas stations do not have such conditions, and the BOG recycling system currently used generally has each device installed directly outdoors and connected by pipeline, which requires higher space, and the waste gas after power supply and heat exchange is directly discharged, which is easy to pollute the environment, and the buffer tank of the existing BOG recycling system is directly connected with internal combustion engine generator set, which has small capacity, leading to short power generation time and low utilization efficiency. Therefore, an improved technology is needed to solve the above problems in the prior art. SUMMARY

[0003] The utility model aims at providing a kind of B0G recycling system of LNG gas station, installation structure is more compact, greatly reduce the space occupied, increase a BOG storage tank between BOG buffer tank and internal combustion engine generator set, to improve the storage capacity of BOG, ensure that internal combustion engine generator set will not be caused by insufficient storage capacity to lead to short working time, waste gas after heat exchange enters activated carbon filter, is discharged through outlet again through activated carbon filter, ensure that the discharge of waste gas will not affect the environment, to solve the problems raised in the above background technology.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of B0G recycling system of LNG gas station, including double-layer mounting frame and recycling system structure;

[0005] The double-layer mounting frame includes chassis, upper platform and lower column, the periphery of the upper surface of the chassis is provided with a plurality of lower columns, the top of the lower column is connected with the upper platform, and a stairway is arranged between the chassis and the upper platform.

[0006] The recycling system structure comprises an air-temperature type gasifier, a BOG buffer tank, a BOG storage tank, an internal combustion engine generator set, a waste heat recovery heat exchanger and an activated carbon filter, the BOG buffer tank, the BOG storage tank and the air-temperature type gasifier are arranged on the upper surface of an upper platform, an exhaust port is further arranged on the upper surface of the upper platform, the internal combustion engine generator set, the waste heat recovery heat exchanger and the activated carbon filter are arranged on the upper surface of a chassis, the inlet end of the air-temperature type gasifier is connected with the venting port of the LNG storage tank through a pipeline, the outlet end of the air-temperature type gasifier is connected with the inlet end of the BOG buffer tank through a pipeline, the outlet end of the BOG buffer tank is connected with the inlet end of the BOG storage tank through a pipeline, the outlet end of the BOG storage tank is connected with the gas inlet end of the internal combustion engine generator set through a pipeline, the exhaust outlet of the internal combustion engine generator set is connected with the inlet end of the gas path of the waste heat recovery heat exchanger through a pipeline, the gas path of the waste heat recovery heat exchanger is connected with the inlet end of the activated carbon filter through a pipeline, and the outlet end of the activated carbon filter is connected with the exhaust port through a pipeline.

[0007] Preferably, the BOG recycling system of the LNG filling station provided by the utility model, wherein, the LNG storage tank and air-temperature type gasifier are connected with pressure reducing valve and several stop valve, the LNG storage tank and air-temperature type gasifier are also connected with pressure gauge.

[0008] Preferably, the BOG recycling system of the LNG filling station provided by the utility model, wherein, the air-temperature type gasifier and BOG buffer tank are connected with emergency shut-off valve and ball valve.

[0009] Preferably, the BOG recycling system of the LNG filling station provided by the utility model, wherein, the BOG buffer tank is also provided with safety valve through stop valve, pressure gauge and pressure transmitter.

[0010] Preferably, the BOG recycling system of the LNG filling station provided by the utility model, wherein, the BOG storage tank and internal combustion engine generator set are provided with ball valve.

[0011] Preferably, the BOG recycling system of the LNG filling station provided by the utility model, wherein, the internal combustion engine generator set and waste heat recovery heat exchanger are provided with stop valve.

[0012] Compared with the prior art, the utility model has the advantages of:

[0013] (1) through LNG storage tank, air temperature type gasifier, BOG buffer tank, BOG storage tank, internal combustion engine generator set, waste heat recovery heat exchanger, the recycling of BOG can be realized, and the BOG buffer tank, the BOG storage tank and the air temperature type gasifier are arranged on the upper surface of the upper platform, the internal combustion engine generator set, the waste heat recovery heat exchanger and the activated carbon filter are installed on the chassis, the installation structure is more compact, and the occupied space is greatly reduced.

[0014] (2) a BOG storage tank is added between the BOG buffer tank and the internal combustion engine generator set, so that the storage capacity of BOG is improved, and it is ensured that the internal combustion engine generator set will not be caused by insufficient storage capacity to be too short in working time.

[0015] (3) the exhaust gas after heat exchange enters the activated carbon filter, and is discharged through the discharge port, so that the exhaust gas discharge will not affect the environment. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a structural schematic view of the utility model;

[0017] Fig. 2 It is a principle schematic view of the utility model.

[0018] In the drawing: chassis 1, upper platform 2, lower column 3, man ladder 4, exhaust port 5, LNG storage tank 6, air temperature type gasifier 7, BOG buffer tank 8, BOG storage tank 9, internal combustion engine generator set 10, waste heat recovery heat exchanger 11, activated carbon filter 12, pressure reducing valve 13, stop valve 14, pressure gauge 15, emergency shut-off valve 16, ball valve 17, pressure transmitter 18, safety valve 19. DETAILED DESCRIPTION

[0019] The technical scheme of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model;

[0020] It should be noted that in the description of the utility model, it should be noted that the terms "in", "out", "up", "down", "two sides", "one end", "the other end", "left", "right" and the like indicate the orientation or positional relationship shown in the drawing, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0021] Please refer toFigs. 1-2 The utility model provides a technical scheme: a BOG recycling system of LNG filling station, including double -deck mounting frame and recycling system structure,

[0022] Double -deck mounting frame includes chassis 1, upper platform 2, lower column 3, double -deck mounting frame includes chassis 1, upper platform 2 and lower column 3, the periphery of the upper surface of chassis 1 is provided with a plurality of lower columns 3, the top of lower column 3 is connected with upper platform 2, and the man -lift 4 is arranged between chassis 1 and upper platform 2.

[0023] Recycling system structure includes air -temperature type gasifier 7, BOG buffer tank 8, BOG storage tank 9, internal combustion engine generator set 10 and waste heat recovery heat exchanger 11, BOG buffer tank 8, BOG storage tank 9 and air -temperature type gasifier 7 are all set up on the upper surface of upper platform 2, and the upper surface of upper platform 2 is also provided with exhaust port 5, internal combustion engine generator set 10, waste heat recovery heat exchanger 11 and activated carbon filter 12 are all set up on the upper surface of chassis 1, the inlet end of air -temperature type gasifier 7 is connected with the venting port of LNG storage tank 6 through pipeline, and the pressure gauge 15 is connected between LNG storage tank 6 and air -temperature type gasifier 7, to realize the communication and closing between LNG storage tank 6 and air -temperature type gasifier 7, and the pressure detection is realized through pressure gauge 15, the outlet end of air -temperature type gasifier 7 is connected with the inlet end of BOG buffer tank 8 through pipeline, the emergency shut-off valve 16 and ball valve 17 are connected between air -temperature type gasifier 7 and BOG buffer tank 8, to realize the communication and closing control between air -temperature type gasifier 7 and BOG buffer tank 8, the outlet end of BOG buffer tank 8 is connected with the inlet end of BOG storage tank 9 through pipeline, BOG buffer tank 8 is also provided with safety valve 19 through stop valve 14, pressure gauge 15 and pressure transmitter 18, to ensure that BOG buffer tank 8 is not damaged due to excessive pressure, and safety is improved, since BOG buffer tank 8 and BOG storage tank 9 are communicated, when the pressure in BOG buffer tank 8 and BOG storage tank 9 is too large, the safety valve opens, the outlet end of BOG storage tank 9 is connected with the gas inlet end of internal combustion engine generator set 10 through pipeline, the ball valve 17 is arranged between BOG storage tank 9 and internal combustion engine generator set 10, to realize the communication and closing between BOG storage tank 9 and internal combustion engine generator set 10, the exhaust outlet of internal combustion engine generator set 10 is connected with the inlet end of the gas path of waste heat recovery heat exchanger 11 through pipeline, the stop valve 14 is arranged between internal combustion engine generator set 10 and waste heat recovery heat exchanger 11, to realize the communication and closing between internal combustion engine generator set 10 and waste heat recovery heat exchanger 11, the gas path of waste heat recovery heat exchanger 11 is connected with the inlet end of activated carbon filter 12 through pipeline, and the outlet end of activated carbon filter 12 is connected with exhaust port 5 through pipeline.

[0024] The installation method and use principle are as follows: firstly, the double-layer installation frame is assembled, then the BOG buffer tank 8, the BOG storage tank 9 and the air-temperature type gasifier 7 are arranged on the upper surface of the upper platform 2, the internal combustion engine generator set 10, the waste heat recovery heat exchanger 11 and the activated carbon filter 12 are installed on the upper surface of the chassis 1, at the same time, the ladder 4 is installed between the chassis 1 and the upper platform 2, and the LNG storage tank 6 is located outside the double-layer installation frame. Then, the venting port of the LNG storage tank 6 is connected with the inlet end of the air-temperature type gasifier 7 through a pipeline, the outlet end of the air-temperature type gasifier 7 is connected with the inlet end of the BOG buffer tank 8 through a pipeline, the outlet end of the BOG buffer tank 8 is connected with the inlet end of the BOG storage tank 9 through a pipeline, then the gas outlet of the BOG storage tank 9 is connected with the internal combustion engine generator set 10 through a pipeline, the exhaust outlet of the internal combustion engine generator set 10 is connected with the waste heat recovery heat exchanger 11 through a pipeline, and the waste heat recovery heat exchanger 11 can be used for heating domestic water. In use, the BOG generated in the LNG storage tank 6 enters the air-temperature type gasifier 7 from the venting port, the temperature of the BOG is raised to above 5 DEG C through the air-temperature type gasifier 7, then the BOG enters the BOG buffer tank 8, and then enters the BOG storage tank 9 from the BOG buffer tank 8, then the BOG is used for the internal combustion engine generator set 10 to supply power, at the same time, the high-temperature exhaust gas generated by the internal combustion engine generator set 10 enters the waste heat recovery heat exchanger 11, so as to be used for heating water. The utility model discloses a reasonable structure, through the LNG storage tank 6, the air-temperature type gasifier 7, the BOG buffer tank 8, the BOG storage tank 9, the internal combustion engine generator set 10 and the waste heat recovery heat exchanger 11, the recycling of BOG can be realized, the BOG buffer tank 8, the BOG storage tank 9 and the air-temperature type gasifier 7 are arranged on the upper surface of the upper platform 2, the internal combustion engine generator set 10, the waste heat recovery heat exchanger 11 and the activated carbon filter 12 are installed on the chassis 1, the installation structure is more compact, and the occupied space is greatly reduced; the BOG storage tank 9 is arranged between the BOG buffer tank 8 and the internal combustion engine generator set 10, so that the storage capacity of the BOG is improved, and the internal combustion engine generator set 10 is ensured to work for a long time without being caused by the too small storage capacity; the exhaust gas after heat exchange enters the activated carbon filter 12, and then is discharged through the exhaust outlet 7, so that the exhaust gas discharge does not affect the environment.

[0025] The parts not described in the utility model are the known technology of the person skilled in the art.

[0026] Finally, it should be pointed out that: the above specific embodiments are only used to illustrate the technical scheme of the utility model and not to limit, although the utility model is described in detail with reference to the embodiments, the person skilled in the art should understand that the technical scheme of the utility model can be modified and replaced, without departing from the spirit and scope of the technical scheme of the utility model, and they should be covered in the claim range of the utility model.

Claims

1. A BOG recovery and utilization system for an LNG refueling station, characterized in that: The application relates to a double-layer mounting frame and a recycling system structure. The double-layer mounting frame comprises a bottom frame (1), an upper layer platform (2) and lower layer columns (3), the outer periphery of the upper surface of the bottom frame (1) is provided with the lower layer columns (3), the top ends of the lower layer columns (3) are connected with the upper layer platform (2), and an escalator (4) is arranged between the bottom frame (1) and the upper layer platform (2). The recycling system structure comprises an air-temperature type gasifier (7), a BOG buffer tank (8), a BOG storage tank (9), an internal combustion engine generator set (10), a waste heat recovery heat exchanger (11) and an activated carbon filter (12), the BOG buffer tank (8), the BOG storage tank (9) and the air-temperature type gasifier (7) are arranged on the upper surface of the upper layer platform (2), an exhaust port (5) is further arranged on the upper surface of the upper layer platform (2), the internal combustion engine generator set (10), the waste heat recovery heat exchanger (11) and the activated carbon filter (12) are arranged on the upper surface of the bottom frame (1), the inlet end of the air-temperature type gasifier (7) is connected with the venting port of an LNG storage tank (6) through a pipeline, the outlet end of the air-temperature type gasifier (7) is connected with the inlet end of the BOG buffer tank (8) through a pipeline, the outlet end of the BOG buffer tank (8) is connected with the inlet end of the BOG storage tank (9) through a pipeline, the outlet end of the BOG storage tank (9) is connected with the gas inlet end of the internal combustion engine generator set (10) through a pipeline, the exhaust port of the internal combustion engine generator set (10) is connected with the gas inlet end of the waste heat recovery heat exchanger (11) through a pipeline, the gas path of the waste heat recovery heat exchanger (11) is connected with the inlet end of the activated carbon filter (12) through a pipeline, and the outlet end of the activated carbon filter (12) is connected with the exhaust port (5) through a pipeline.

2. The BOG recovery system of claim 1, wherein: The LNG storage tank (6) and the air-temperature type gasifier (7) are connected with a pressure reducing valve (13) and a plurality of stop valves (14), and are further connected with a pressure gauge (15).

3. The BOG recovery system of claim 1, wherein: The air-temperature type gasifier (7) and the BOG buffer tank (8) are connected with an emergency cut-off valve (16) and a ball valve (17).

4. The BOG recovery system of claim 1, wherein: The BOG buffer tank (8) is further provided with a safety valve (19) through the stop valve (14), the pressure gauge (15) and a pressure transmitter (18).

5. The BOG recovery system of claim 1, wherein: The BOG storage tank (9) and the internal combustion engine generator set (10) are provided with a ball valve (17).

6. The BOG recovery system of claim 1, wherein: The internal combustion engine generator set (10) and the waste heat recovery heat exchanger (11) are provided with a stop valve (14).

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