CN210532063U

CN210532063U - Boil-off gas direct supply device for liquefied natural gas receiving station

Info

Publication number: CN210532063U
Application number: CN201921291212.4U
Authority: CN
Inventors: 王小尚; 张红
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-09
Filing date: 2019-08-09
Publication date: 2020-05-15
Anticipated expiration: 2029-08-09

Abstract

The utility model discloses a liquefied natural gas receiving station boil-off gas directly supplies device, including natural gas storage jar, natural gas storage jar one end is connected with outlet duct and intake pipe, installs the boil-off gas compressor on the outlet duct, and the one end of outlet duct is connected with retrieves the jar, installs first three-way valve in the intake pipe, and the lower extreme of natural gas storage jar is connected with first feed liquor pipe and second feed liquor pipe respectively, and the one end of first feed liquor pipe is connected with the tank wagon. This liquefied natural gas receiving station boil-off gas direct supply device increases the recovery tank, and the storage partly evaporates the gas, uses intake-tube connection natural gas storage jar and recovery tank, adjusts the pressure of natural gas storage jar through the evaporation gas in the recovery tank, and the tank car is connected to first three-way valve in addition, utilizes the high-pressure evaporation gas in the recovery tank to impress the liquefied natural gas in the tank car in to the natural gas storage jar, does not need the pressure boost to unload, and is energy-concerving and environment-protective.

Description

Boil-off gas direct supply device for liquefied natural gas receiving station

Technical Field

The utility model relates to a liquefied natural gas boil-off gas technical field specifically is a liquefied natural gas receiving station boil-off gas directly supplies device.

Background

At present, a domestic LNG (Liquefied Natural Gas) receiving station generally adopts a recondensing technology to process BOG (boil Off Gas), and the method can be realized only by means of a process with external output, so that under the condition of no external output, such as test run, maintenance and the like, a large amount of BOG is produced to be emptied and burnt, in the test run period of some LNG receiving stations for 30 days in recent years, Natural Gas with the price value of 1500-2000 ten thousand is burnt, even because the external output condition is not available, the BOG burning time caused by the non-use recondensing technology can reach half a year, and economic loss and environmental pollution are caused to be inestimable.

Chinese patent CN207005699U discloses a boil-off gas direct supply device for a liquefied natural gas receiving station, comprising: the natural gas storage tank, the gas inlet pipe, the gas outlet pipe, the vapor compressor and the external transmission pipeline; the evaporation gas compressor is provided with a gas inlet and a gas outlet; the natural gas storage jar with the one end intercommunication of intake pipe, the other end of intake pipe with the vapor compression machine the air inlet intercommunication, the vapor compression machine the gas outlet with the one end intercommunication of outlet duct, the other end of outlet duct with defeated pipeline intercommunication outward, defeated pipeline outward is used for communicating with the user side. Through newly-increased defeated pipeline outward, the boil-off gas compressor directly carries the boil-off gas of natural gas storage jar to the user, and its operating means is simple, can effectively avoid the waste of liquefied natural gas boil-off gas, need not newly-increased equipment for the cost is lower, and has effectively reduced the energy consumption.

Although this application solves the problems of the background art to some extent, the pressure in the natural gas storage tank cannot be adjusted and the excess boil-off gas cannot be stored.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a liquefied natural gas receiving station boil-off gas directly supplies device has energy-concerving and environment-protective, and recycle rate is high, and the problem among the prior art has been solved to the advantage of automated inspection leakage.

In order to achieve the above object, the utility model provides a following technical scheme: a direct supply device for boil-off gas of a liquefied natural gas receiving station comprises a natural gas storage tank, wherein one end of the natural gas storage tank is connected with an air outlet pipe and an air inlet pipe, an evaporator compressor is installed on the air outlet pipe, one end of the air outlet pipe is connected with a recovery tank, a first three-way valve is installed on the air inlet pipe, the lower end of the natural gas storage tank is respectively connected with a first liquid inlet pipe and a second liquid inlet pipe, one end of the first liquid inlet pipe is connected with a tank truck, one end of the second liquid inlet pipe is connected with a recondenser, the input end of the recondenser is connected with a second three-way valve through a pipeline, one end of the second three-way valve is connected with the recovery tank through a first pipeline, one end of the recovery tank is fixedly connected with one end of the air inlet pipe, the upper end of the first three-way valve, the lateral wall of the leakage detection device is provided with a mounting groove, the upper end of the mounting groove is connected with a movable groove, the upper end of the leakage detection device is connected with a detection box, a first sensor is installed in the leakage detection device below the detection box, the two sides of the detection box are symmetrically provided with a through hole, a negative pressure fan is installed on one side of the through hole, a buzzer and a second sensor are installed at the top of the interior of the detection box, and a controller and a circuit board are installed at the lower end of the interior of the detection box.

Preferably, the second three-way valve is also provided with a leakage detection device, and the magnet is respectively connected with the first three-way valve and the second three-way valve in a suction way.

Preferably, the controller is electrically connected with the circuit board, and the circuit board is electrically connected with the first sensor, the negative pressure fan, the buzzer and the second sensor respectively.

Preferably, one end of the first three-way valve is connected with a second pipeline, and one end of the second pipeline is connected with the tank truck.

Preferably, the first liquid inlet pipe and the second pipeline are movably connected with the tank truck.

Preferably, the first pipeline is provided with a metering pressure regulating pry, and the second three-way valve is connected with a client through a pipeline.

Compared with the prior art, the beneficial effects of the utility model are as follows:

this liquefied natural gas receiving station boil-off gas direct supply device, increase the recovery tank, store some boil-off gas, use intake-tube connection natural gas storage jar and recovery tank, the pressure of natural gas storage jar is adjusted through the boil-off gas in the recovery tank, first three-way valve connection tank wagon in addition, utilize the high-pressure boil-off gas in the recovery tank to impress the liquefied natural gas in the tank wagon in to the natural gas storage jar, do not need the pressure boost to unload, energy-concerving and environment-protective, the storage capacity of boil-off gas has been improved, recycle rate is high, and all be connected with the leak detection device on first three-way valve and second three-way valve, adopt first sensor and second sensor to detect whether there is the natural gas leakage, and in time report to the police through.

Drawings

FIG. 1 is an overall structure diagram of the present invention;

FIG. 2 is a structural diagram of the leak detector of the present invention;

fig. 3 is a mounting structure diagram of the leakage detecting device of the present invention.

In the figure: 1. a natural gas storage tank; 11. an air outlet pipe; 12. an air inlet pipe; 13. an evaporation gas compressor; 14. a first liquid inlet pipe; 15. a second liquid inlet pipe; 16. a recondenser; 2. a recovery tank; 3. a first three-way valve; 31. a handle; 32. a valve core; 33. a second conduit; 4. a tank truck; 5. a second three-way valve; 51. a first conduit; 52. the pressure regulating pry is measured; 53. a client; 6. a leak detection device; 61. a magnet; 62. mounting grooves; 621. a movable groove; 63. a first sensor; 64. a detection cartridge; 641. a through hole; 65. a negative pressure fan; 66. a buzzer; 67. a second sensor; 68. a controller; 69. a circuit board.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, a boil-off gas direct supply device for a liquefied natural gas receiving station comprises a natural gas storage tank 1, one end of the natural gas storage tank 1 is connected with an air outlet pipe 11 and an air inlet pipe 12, the air outlet pipe 11 is provided with a boil-off gas compressor 13, one end of the air outlet pipe 11 is connected with a recovery tank 2, the air inlet pipe 12 is provided with a first three-way valve 3, the lower end of the natural gas storage tank 1 is respectively connected with a first liquid inlet pipe 14 and a second liquid inlet pipe 15, one end of the first liquid inlet pipe 14 is connected with a tank truck 4, one end of the second liquid inlet pipe 15 is connected with a recondenser 16, the input end of the recondenser 16 is connected with a second three-way valve 5 through a pipeline, one end of the second three-way valve 5 is connected with the recovery tank 2 through a first pipeline 51, the first pipeline 51 is provided with a metering pressure regulating, the second three-way valve 5 is also provided with a leakage detection device 6, the magnet 61 is respectively connected with the first three-way valve 3 and the second three-way valve 5 in an attracting way, the installation is convenient, the disassembly is easy, the reuse can be realized, one end of the recovery tank 2 is fixedly connected with one end of the air inlet pipe 12, the upper end of the first three-way valve 3 is provided with a handle 31, the lower end of the handle 31 is connected with a valve core 32, the leakage detection device 6 penetrates through the handle 31, one end of the first three-way valve 3 is connected with a second pipeline 33, one end of the second pipeline 33 is connected with the tank truck 4, the second pipeline 33 can guide high-pressure gas in the recovery tank 2 into the tank truck 4, the liquid natural gas in the tank truck 4 is pressed into the natural gas storage tank 1, the pressurization unloading is not needed, and the first liquid inlet pipe 14 and the second pipeline, when the vehicle is not unloaded, the first intake pipe 14 and the second pipe 33 are in the idle closed state.

Referring to fig. 2-3, the lower end of the leakage detecting device 6 is connected with a magnet 61, the side wall of the leakage detecting device 6 is provided with an installation groove 62, the upper end of the installation groove 62 is connected with a movable groove 621, the upper end of the leakage detecting device 6 is connected with a detecting box 64, a first sensor 63 is installed in the leakage detecting device 6 below the detecting box 64, through holes 641 are symmetrically formed in two sides of the detecting box 64, a negative pressure fan 65 is installed on one side of the through hole 641, a buzzer 66 and a second sensor 67 are installed on the top of the inside of the detecting box 64, a controller 68 and a circuit board 69 are installed on the lower end of the inside of the detecting box 64, the controller 68 is electrically connected with the circuit board 69, the circuit board 69 is electrically connected with the first sensor 63, the negative pressure fan 65, the buzzer 66 and the second sensor 67 respectively, the first sensor 63 is used, namely, whether the three-way valve leaks or not, whether the second sensor 67 leaks or not is used for detecting the leakage of the external pipeline, the negative pressure fan 65 rotates to accelerate the air to enter the detection box 64 and accelerate the detection of whether the external natural gas leaks or not, the first sensor 63 and the second sensor 67 send the detected leakage information to the controller 68, and the controller 68 starts the buzzer 66 to give an alarm.

The working process is as follows: the boil-off gas in the natural gas storage tank 1 passes through the gas outlet pipe 11 and is compressed into high pressure by the boil-off gas compressor 13, and enters the recovery tank 2 for storage, when the client 53 needs to use, the boil-off gas is pressure-regulated by the metering pressure regulating pry 52 and is conveyed to the client 53 for use, excessive boil-off gas is condensed by the recondenser 16 and is conveyed back to the natural gas storage tank 1, the high-pressure boil-off gas stored in the recovery tank 2 can enter the natural gas storage tank 1 through the first three-way valve 3, so as to realize the pressure regulation of the natural gas storage tank 1, meanwhile, when the tank truck 4 unloads, the first three-way valve 3 guides the high-pressure boil-off gas into the tank truck 4, the liquid natural gas in the tank truck 4 is pressed into the natural gas storage tank 1, and the pressure unloading is not needed, the first sensor 63, the second sensor 67 is used for detecting whether leakage occurs when an external pipeline exists, the negative pressure fan 65 rotates to accelerate air to enter the detection box 64 and accelerate detection of whether leakage natural gas exists outside, the first sensor 63 and the second sensor 67 send detected leakage information to the controller 68, and the controller 68 starts the buzzer 66 to give an alarm.

In summary, the following steps: this liquefied natural gas receiving station boil-off gas direct supply device, increase recovery tank 2, store some boil-off gas, use intake pipe 12 to connect natural gas storage jar 1 and recovery tank 2, through the pressure of the boil-off gas regulation natural gas storage jar 1 in the recovery tank 2, in addition first three-way valve 3 connects tank wagon 4, utilize the high-pressure boil-off gas in the recovery tank 2 to impress the liquefied natural gas in the tank wagon 4 to the natural gas storage jar 1 in, do not need the pressure boost to unload, energy-concerving and environment-protective, the storage capacity of boil-off gas has been improved, recycle rate is high, and all be connected with leak detection device 6 on first three-way valve 3 and second three-way valve 5, whether adopt first sensor 63 and second sensor 67 to detect has the natural gas to leak, and in time report to the police through bee calling organ 66, in time acquire.

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 invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a liquefied natural gas receiving station boil-off gas directly supplies device, includes natural gas storage jar, its characterized in that: one end of the natural gas storage tank is connected with an air outlet pipe and an air inlet pipe, an evaporation gas compressor is installed on the air outlet pipe, one end of the air outlet pipe is connected with a recovery tank, a first three-way valve is installed on the air inlet pipe, the lower end of the natural gas storage tank is respectively connected with a first liquid inlet pipe and a second liquid inlet pipe, one end of the first liquid inlet pipe is connected with a tank truck, one end of the second liquid inlet pipe is connected with a recondenser, the input end of the recondenser is connected with a second three-way valve through a pipeline, one end of the second three-way valve is connected with the recovery tank through a first pipeline, one end of the recovery tank is fixedly connected with one end of the air inlet pipe, a handle is installed at the upper end of the first three-way valve, the lower end of the handle is connected with a valve core, a leakage detection device, the upper end of the leakage detection device is connected with a detection box, a first sensor is installed in the leakage detection device below the detection box, through holes are symmetrically formed in two sides of the detection box, a negative pressure fan is installed on one side of each through hole, a buzzer and a second sensor are installed at the top of the interior of the detection box, and a controller and a circuit board are installed at the lower end of the interior of the detection box.

2. The boil-off gas direct supply device of the liquefied natural gas receiving station according to claim 1, wherein: and the second three-way valve is also provided with a leakage detection device, and the magnet is respectively connected with the first three-way valve and the second three-way valve in a suction way.

3. The boil-off gas direct supply device of the liquefied natural gas receiving station according to claim 1, wherein: the controller is electrically connected with the circuit board, and the circuit board is electrically connected with the first sensor, the negative pressure fan, the buzzer and the second sensor respectively.

4. The boil-off gas direct supply device of the liquefied natural gas receiving station according to claim 1, wherein: one end of the first three-way valve is connected with a second pipeline, and one end of the second pipeline is connected with the tank truck.

5. The boil-off gas direct supply device of the liquefied natural gas receiving station according to claim 1, wherein: the first liquid inlet pipe and the second pipeline are both movably connected with the tank truck.

6. The boil-off gas direct supply device of the liquefied natural gas receiving station according to claim 1, wherein: the first pipeline is provided with a metering pressure regulating pry, and the second three-way valve is connected with a client through a pipeline.