CN215446006U

CN215446006U - Flash evaporation gas BOG direct supply device

Info

Publication number: CN215446006U
Application number: CN202121682183.1U
Authority: CN
Inventors: 李雅娴; 赫文博
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2022-01-07
Anticipated expiration: 2031-07-22

Abstract

The utility model discloses a flash evaporation gas BOG direct supply device, which relates to the technical field of natural gas and comprises a low-temperature storage tank, wherein four support rods are arranged at the top end of the low-temperature storage tank, an installation plate is arranged at the top end of each support rod, a BOG compressor is arranged on one side of the top end of the installation plate, an air inlet pipe is arranged at the input end of the BOG compressor, one end of the air inlet pipe extends into the low-temperature storage tank, a condenser is arranged on the other side of the top end of the installation plate, and a vent pipe is arranged at the input end of the condenser. According to the utility model, the gas is introduced into the temporary storage box for temporary storage, and the gas in the temporary storage box can not leave through the first three-way pipe blocked by the rubber plug, so that a certain amount of gas can be stored in the temporary storage box, no gas is supplied when a user uses the temporary storage box, and the problem that the gas can not be supplied continuously is solved.

Description

Flash evaporation gas BOG direct supply device

Technical Field

The utility model relates to the technical field of natural gas, in particular to a BOG direct supply device for flash evaporation gas.

Background

After the natural gas is conveyed to a receiving station through a pipeline, the natural gas is stored in a low-temperature LNG storage tank in the receiving station, the internal temperature is about minus 160 ℃, and the LNG in the tank is gasified to generate flash natural gas, namely BOG, under the influence of factors such as external environment and the like. The part of the flash natural gas is collected and then is pressurized to be changed into liquefied natural gas again, however, in the process, a part of the flash natural gas cannot be compressed, and the part of BOG is generally directly supplied to users for use, so that the danger caused by overlarge internal pressure of the low-temperature storage tank is prevented, the resources are saved, and the effects of energy conservation and emission reduction are achieved.

Through retrieval, chinese patent No. CN207005699U, published 2018, No. 02, No. 13, discloses a direct supply device for boil-off gas in an lng receiving station, and it is proposed that "the boil-off gas in a natural gas storage tank is directly delivered to a user side by an additional external delivery pipe, and a boil-off gas compressor is provided, which has a simple operation mode, can effectively avoid waste of the boil-off gas of the lng, does not need to add new equipment, has a low cost, and effectively reduces energy consumption", but when the device is put into use, the gas in the pipe cannot be continuously supplied, and the user may have an embarrassment situation that the gas is not available when using the device.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a flash evaporation gas BOG direct supply device to solve the problem that gas cannot be supplied uninterruptedly in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: a flash evaporation gas BOG direct supply device comprises a low-temperature storage tank, wherein four supporting rods are installed at the top end of the low-temperature storage tank, a mounting plate is installed at the top end of each supporting rod, a BOG compressor is installed at one side of the top end of the mounting plate, an air inlet pipe is installed at the input end of the BOG compressor, one end of the air inlet pipe extends into the low-temperature storage tank, a condenser is installed at the other side of the top end of the mounting plate, an air vent pipe is installed at the input end of the condenser, one end of the air vent pipe is connected with the output end of the BOG compressor, a second three-way pipe is installed at the output end of the condenser, a liquid return pipe is installed at the bottom end of the second three-way pipe, the bottom end of the liquid return pipe extends into the low-temperature storage tank, an air supply pipe is installed at the top end of the liquid return pipe, a plurality of first three-way pipes are arranged on one side of the air supply pipe, and a plurality of air guide pipes are arranged on one side of the first three-way pipe, both ends of the air guide pipe are connected with one end of a first three-way pipe, and leakage detection structures are arranged inside the air supply pipe and the air guide pipe;

a non-return structure is arranged in the first three-way pipe;

the top end of the first three-way pipe is provided with a temporary storage structure.

Preferably, the non return structure includes the fixed block, the fixed block all is fixed in the top of first tee bend inside pipe wall, and the inside of fixed block has all seted up a plurality of logical grooves, the extension spring is all installed on the top of fixed block, and the rubber buffer is all installed on the top of extension spring.

Preferably, the rubber buffer is spherical in shape, and the diameter of the rubber buffer is greater than the inner diameter of the first three-way pipe.

Preferably, each group of the through grooves is provided with four through grooves, and the through grooves are distributed at equal angles relative to the vertical center line of the fixed block.

Preferably, the fixed blocks are all cylindrical in shape, and the diameter of the fixed blocks is equal to the inner diameter of the first three-way pipe.

Preferably, the leak detection structure includes controller, first gas concentration sensor, second gas concentration sensor and locator, first gas concentration sensor installs in the inside top of blast pipe, second gas concentration sensor all installs in one side on the inside top of air duct, and one side of second gas concentration sensor all is provided with the locator, the top of locator all is connected with the inside top of air duct, the controller is installed in one side on mounting panel top.

Preferably, the structure of keeping in includes temporary storage case, outlet duct, pilot lamp, air-vent valve and baroceptor, the temporary storage case is all installed on the top of first three-way pipe, baroceptor is all installed to one side of the inside bottom of temporary storage case, and the pilot lamp is all installed to one side of the temporary storage case, the outlet duct is all installed on the top of temporary storage case, and the air-vent valve is all installed to one side of outlet duct, the one end of air-vent valve all extends to the inside of outlet duct.

Compared with the prior art, the BOG direct supply device for the flash evaporation gas provided by the utility model has the following beneficial effects:

the utility model provides a non-return structure, a temporary storage structure and a first three-way pipe, wherein a rubber plug is pushed by gas passing through a fixed block from a through groove, so that the rubber plug overcomes the gap generated between the movement of a tension spring and the first three-way pipe, the gas can enter the temporary storage box for temporary storage, and the gas in the temporary storage box can not leave through the first three-way pipe blocked by the rubber plug, so that a certain amount of gas can be stored in the temporary storage box.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic front view of the present invention;

FIG. 3 is a schematic view of a partial front cross-sectional structure of the present invention;

FIG. 4 is a schematic bottom sectional view of the check structure of the present invention;

fig. 5 is an enlarged schematic view of the structure at a in fig. 3 according to the present invention.

In the figure: 1. a leak detection structure; 101. a controller; 102. a first gas concentration sensor; 103. a second gas concentration sensor; 104. a positioner; 2. a temporary storage structure; 201. a temporary storage box; 202. an air outlet pipe; 203. an indicator light; 204. a pressure regulating valve; 205. an air pressure sensor; 3. mounting a plate; 4. an air inlet pipe; 5. a low-temperature storage tank; 6. a support bar; 7. a condenser; 8. an air supply pipe; 9. a first three-way pipe; 10. an air duct; 11. a breather pipe; 12. a BOG compressor; 13. a liquid return pipe; 14. a second three-way pipe; 15. a rubber plug; 16. a through groove; 17. a fixed block; 18. a tension spring.

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; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1: referring to fig. 1-5, a flash evaporation gas BOG direct supply device comprises a low-temperature storage tank 5, four support rods 6 are installed at the top end of the low-temperature storage tank 5, a mounting plate 3 is installed at the top end of each support rod 6, a BOG compressor 12 is installed at one side of the top end of the mounting plate 3, the model of the BOG compressor 12 can be ZW-2.2/(0.5-3.2) -4, an air inlet pipe 4 is installed at the input end of the BOG compressor 12, one end of the air inlet pipe 4 extends into the low-temperature storage tank 5, a condenser 7 is installed at the other side of the top end of the mounting plate 3, the model of the condenser 7 can be DWN-25, a vent pipe 11 is installed at the input end of the condenser 7, one end of the vent pipe 11 is connected with the output end of the BOG compressor 12, a second three-way pipe 14 is installed at the output end of the condenser 7, and a liquid return pipe 13 is installed at the bottom end of the second three-way pipe 14, the bottom end of the liquid return pipe 13 extends into the low-temperature storage tank 5, the top end of the liquid return pipe 13 is provided with an air supply pipe 8, one side of the air supply pipe 8 is provided with a plurality of first three-way pipes 9, one side of each first three-way pipe 9 is provided with a plurality of air guide pipes 10, two ends of each air guide pipe 10 are connected with one end of each first three-way pipe 9, and the air supply pipe 8 and the air guide pipes 10 are internally provided with the leakage detection structure 1;

a non-return structure is arranged in the first three-way pipe 9;

the top end of the first three-way pipe 9 is provided with a temporary storage structure 2.

Referring to fig. 1-5, the flash evaporation gas BOG direct supply device further comprises a non-return structure, the non-return structure comprises fixed blocks 17, the fixed blocks 17 are all fixed at the top end of the inner wall of the first three-way pipe 9, a plurality of through grooves 16 are formed in the fixed blocks 17, tension springs 18 are installed at the top ends of the fixed blocks 17, and rubber stoppers 15 are installed at the top ends of the tension springs 18;

the rubber stopper 15 is spherical in shape, and the diameter of the rubber stopper 15 is larger than the inner diameter of the first three-way pipe 9.

The through grooves 16 are provided in four per group, and the through grooves 16 are distributed at equal angles with respect to the vertical center line of the fixing block 17.

The fixed blocks 17 are cylindrical, and the diameter of each fixed block 17 is equal to the inner diameter of the first three-way pipe 9;

specifically, as shown in fig. 3, 4 and 5, the gas passes through the fixing block 17 from the through groove 16, and then pushes the rubber stopper 15, so that the rubber stopper overcomes the gap between the movement of the tension spring 18 and the first three-way pipe 9, thereby causing the gas to enter the temporary storage box 201 for temporary storage, and the gas inside the temporary storage box 201 cannot leave through the first three-way pipe 9 blocked by the rubber stopper 15, thereby ensuring that a certain amount of gas can be stored inside the temporary storage box 201.

Example 2: the leak detection structure 1 comprises a controller 101, a first gas concentration sensor 102, a second gas concentration sensor 103 and a positioner 104, wherein the first gas concentration sensor 102 is mounted at the top end inside the air feeding pipe 8, the first gas concentration sensor 102 can be MP-4, the second gas concentration sensor 103 is mounted at one side of the top end inside the air guide pipe 10, the second gas concentration sensor 103 can be MP-4, the positioner 104 is arranged at one side of the second gas concentration sensor 103, the top end of the positioner 104 is connected with the top end inside the air guide pipe 10, the positioner 104 can be N300, the controller 101 is mounted at one side of the top end of the mounting plate 3, and the controller 101 can be FX3SA-10 MR-CM;

specifically, as shown in fig. 1, fig. 2 and fig. 3, when BOG enters the air supply pipe 8, the first gas concentration sensor 102 first detects to determine the concentration of BOG, then the gas is conveyed through the gas guide pipe 10 and enters the use of each user by using the first three-way pipe 9, each gas guide pipe 10 detects the gas concentration once by using the second gas concentration sensor 103 and transmits the information to the controller 101, when the difference between the values of the first gas concentration sensor 102 and a certain second gas concentration sensor 103 is too large, the positioner 104 corresponding to the second gas concentration sensor 103 sends a signal to determine the position, and the position is displayed by the controller 101, so that the position suspected of leakage can be determined quickly, and convenience is provided for emergency maintenance.

Example 3: the temporary storage structure 2 comprises temporary storage boxes 201, air outlet pipes 202, indicator lamps 203, pressure regulating valves 204 and air pressure sensors 205, wherein the temporary storage boxes 201 are all installed at the top end of the first three-way pipe 9, the air pressure sensors 205 are installed on one sides of the bottom end inside the temporary storage boxes 201, the types of the air pressure sensors 205 can be MI K-P300, the indicator lamps 203 are installed on one sides of the temporary storage boxes 201, the air outlet pipes 202 are installed at the top ends of the temporary storage boxes 201, the pressure regulating valves 204 are installed on one sides of the air outlet pipes 202, and one ends of the pressure regulating valves 204 extend into the air outlet pipes 202;

specifically, as shown in fig. 1, 2 and 3, the gas inside the temporary storage tank 201 can be taken at any time by opening the pressure regulating valve 204, when the gas pressure inside the temporary storage tank 201 is too high, the first three-way pipe 9 is blocked by the rubber plug 15, so that the gas is prevented from continuously entering the temporary storage tank, meanwhile, the gas pressure sensor 205 detects the gas pressure inside the temporary storage tank 201, and once the gas pressure is too high, the indicator lamp 203 is turned on to prompt a user, so that danger is avoided.

The working principle is as follows: when the device is used, firstly, the device is built, LNG in the low-temperature storage tank 5 can generate BOG due to external factors, the BOG enters the BOG compressor 12 from the air inlet pipe 4, and enters the condenser 7 from the vent pipe 11 after being compressed by the BOG compressor 12 for recondensation, so that liquid can enter the liquid return pipe 13 from the bottom end of the second three-way pipe 14 and finally returns to the low-temperature storage tank 5 for storage, and BOG which is not converted can enter the air inlet pipe 8 from the upper end of the second three-way pipe 14 and is ready for a user to use;

when BOG enters the air supply pipe 8, the first gas concentration sensor 102 firstly carries out primary detection to determine the concentration of the BOG, then the gas is conveyed through the gas guide pipes 10 and enters the use of each user by using the first three-way pipe 9, each gas guide pipe 10 carries out primary detection on the gas concentration by using the second gas concentration sensor 103 and transmits the information to the controller 101, when the numerical difference between the first gas concentration sensor 102 and one second gas concentration sensor 103 is overlarge, the positioner 104 corresponding to the second gas concentration sensor 103 sends out a signal to determine the position, and the position is displayed by the controller 101, so that the suspected leakage place can be rapidly determined, and convenience is provided for rush repair;

before the gas enters the temporary storage box 201 from the first three-way pipe 9, the gas passes through the fixing block 17 from the through groove 16, and then the rubber plug 15 is pushed to overcome the gap generated between the movement of the tension spring 18 and the first three-way pipe 9, so that the gas can enter the temporary storage box 201 for temporary storage, and the gas in the temporary storage box 201 cannot leave through the first three-way pipe 9 blocked by the rubber plug 15, thereby ensuring that a certain amount of gas can be stored in the temporary storage box 201;

the gas in the temporary storage box 201 can be taken at any time by opening the pressure regulating valve 204, when the air pressure in the temporary storage box 201 is too large, the first three-way pipe 9 can be blocked by the rubber plug 15, the gas is prevented from continuously entering the air, meanwhile, the air pressure sensor 205 can detect the air pressure in the temporary storage box 201, once the air pressure is too large, the indicator lamp 203 can be lightened, a user is prompted, and danger is avoided.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a flash evaporation gas BOG directly supplies device, includes low temperature storage tank (5), its characterized in that: four support rods (6) are installed on the top end of the low-temperature storage tank (5), a mounting plate (3) is installed on the top end of each support rod (6), a BOG compressor (12) is installed on one side of the top end of the mounting plate (3), an air inlet pipe (4) is installed at the input end of the BOG compressor (12), one end of the air inlet pipe (4) extends to the inside of the low-temperature storage tank (5), a condenser (7) is installed on the other side of the top end of the mounting plate (3), a vent pipe (11) is installed at the input end of the condenser (7), one end of the vent pipe (11) is connected with the output end of the BOG compressor (12), a second three-way pipe (14) is installed at the output end of the condenser (7), a liquid return pipe (13) is installed at the bottom end of the second three-way pipe (14), and the bottom end of the liquid return pipe (13) extends to the inside of the low-temperature storage tank (5), an air supply pipe (8) is mounted at the top end of the liquid return pipe (13), a plurality of first three-way pipes (9) are arranged on one side of the air supply pipe (8), a plurality of air guide pipes (10) are arranged on one side of the first three-way pipes (9), two ends of each air guide pipe (10) are connected with one end of each first three-way pipe (9), and leakage detection structures (1) are arranged inside the air supply pipe (8) and the air guide pipes (10);

a non-return structure is arranged in the first three-way pipe (9);

the top end of the first three-way pipe (9) is provided with a temporary storage structure (2).

2. The flash boil-off gas BOG direct supply device of claim 1, wherein: the non return structure includes fixed block (17), fixed block (17) all are fixed in the top of first three-way pipe (9) inner wall, and the inside of fixed block (17) has all seted up a plurality of logical grooves (16), extension spring (18) are all installed on the top of fixed block (17), and rubber buffer (15) are all installed on the top of extension spring (18).

3. The flash boil-off gas BOG direct supply device according to claim 2, wherein: the rubber buffer (15) is spherical, and the diameter of the rubber buffer (15) is larger than the inner diameter of the first three-way pipe (9).

4. The flash boil-off gas BOG direct supply device according to claim 2, wherein: four through grooves (16) are arranged in each group, and the through grooves (16) are distributed in an equal angle mode relative to the vertical center line of the fixed block (17).

5. The flash boil-off gas BOG direct supply device according to claim 2, wherein: the fixed blocks (17) are all cylindrical in shape, and the diameter of the fixed blocks (17) is equal to the inner diameter of the first three-way pipe (9).

6. The flash boil-off gas BOG direct supply device of claim 1, wherein: leak detection structure (1) includes controller (101), first gas concentration sensor (102), second gas concentration sensor (103) and locator (104), install on the inside top of blast pipe (8) first gas concentration sensor (102), second gas concentration sensor (103) are all installed in one side on the inside top of air duct (10), and one side of second gas concentration sensor (103) all is provided with locator (104), the top of locator (104) all is connected with the inside top of air duct (10), one side on mounting panel (3) top is installed in controller (101).

7. The flash boil-off gas BOG direct supply device of claim 1, wherein: temporary storage structure (2) are including keeping in case (201), outlet duct (202), pilot lamp (203), air-vent valve (204) and baroceptor (205), the top in first three-way pipe (9) is all installed in temporary storage case (201), baroceptor (205) are all installed to one side of the inside bottom of temporary storage case (201), and just indicator lamp (203) are all installed to one side of temporary storage case (201), outlet duct (202) are all installed on the top of temporary storage case (201), and air-vent valve (204) are all installed to one side of outlet duct (202), the one end of air-vent valve (204) all extends to the inside of outlet duct (202).