KR102498587B1 - Facility management system operation structure of the LNG supply system - Google Patents

Abstract

The present invention relates to an operating structure of a facility management system of an LNG supply system, and more particularly, in an LNG supply system consisting of four stages of LNG charging, LNG transportation, NG supply, and BOG use, the use of equipment constituting each stage of the system It relates to an operating structure of a facility management system of an LNG supply system that enables efficient management and operation of an LNG system by accurately determining conditions and characteristics.

Description

Facility management system operation structure of the LNG supply system}

The present invention relates to an operating structure of an LNG supply system.

The LNG supply system is a supply facility that can convert LNG into NG through a vaporizer and supply it constantly to power plants. Fuel is supplied to the natural gas mixed-fire generator at the operating pressure through NG supply facilities (heater, governor, meter, etc.), and the supply facility consists of an LNG storage tank, pump, vaporizer, heater, and generator.

In the case of such an LNG supply system, it is composed of a four-step process of LNG charging, LNG transfer, NG supply, and BOG use. In order to monitor various and complex LNG supply facilities installed in the above LNG supply system, various operating systems must be configured. and it must be possible to monitor the facility and set various operating environments with the main operator interface.

In addition, since this LNG supply system requires special attention because it uses ultra-low temperature LNG and high-pressure equipment, care must be taken in the operation of each equipment constituting the LNG supply system. Accordingly, there is a demand for development of technologies for operation and management related to major facilities of the LNG supply system.

Republic of Korea Patent Registration No. 10-2002951 (registered on July 17, 2019)

The present invention has been made to solve the above problems, and an object of the present invention is an operation and management structure of a plurality of equipment used in each of various processes such as LNG charging, LNG transfer, NG supply, and BOG use in an LNG supply system It relates to an operating structure of a facility management system of an LNG supply system that enables the operation and management of an LNG system to be effectively performed by providing accurate information to the operator regarding the connection structure and operation of each equipment.

Other objects and advantages of the present invention will be described below, and will be learned by way of examples of the present invention. Furthermore, the objects and advantages of the present invention may be realized by means of the instrumentalities and combinations indicated in the claims.

The present invention is a means for solving the above problems,

It is an operation structure of the facility management system of the LNG supply system 100 consisting of four stages of LNG charging, LNG transfer, NG supply, and BOG use,

A storage tank 20 composed of a low-pressure storage tank 21 in which LNG is filled from the tank lorry 10 and a high-pressure storage tank 22 in which LNG in the low-pressure storage tank 21 is transported and stored by the LNG pump 23;

In order to reuse the BOG generated in the storage tank 20 as NG, after warming the BOG recovered through the BOG vaporizer 31 through heat exchange with the atmosphere and storing it in the BOG buffer tank 32, the stored BOG BOG processing facility 30 to be compressed by passing through the BOG compressor 33;

Vaporizers 24 that vaporize the LNG received from the high-pressure storage tank 22 through heat exchange with the outside atmosphere to make it NG, and two vaporizers 24 installed in parallel to be operated for replacement and continuously used;

During the winter season, an NG heater 25 that heats the NG having a temperature lower than the air temperature by exchanging heat with the air to room temperature;

NG heated to room temperature is stored after mixing the odorant through the odor injection facility 26, so that leaks and leak locations can be checked by odor, and NG mixed with BOG that has passed through the BOG treatment facility 30 buffer tank 27;

In order to cool the heat of the storage tank 20 in case of fire, a fire extinguishing water facility 50 composed of a water tank, a water supply device, and a pump;

A nitrogen generator 51 supplying nitrogen for operating the valve of the LNG supply system 100; consists of,

The NG of the NG buffer tank 27 is adjusted to a preset supply pressure through the static pressure facility 28 according to the required usage amount of the place of use, and then supplied according to the flow rate through the flow meter 29. Characterized by LNG supply system facility management system operating structure.

As described above, the present invention has the effect of enabling smooth and efficient management and operation of the LNG supply system by understanding each characteristic constituting the LNG supply system and reliably grasping the operating conditions and usage conditions. .

1 is a structure of an embodiment showing an LNG supply system according to the present invention.
2 is a view of an embodiment showing a high-pressure storage tank according to the present invention.
3 and 4 are views of an embodiment showing a vaporizer according to the present invention.
5 is a view of an embodiment showing an odor injection equipment according to the present invention.
6 is a diagram of an embodiment showing an NG buffer tank according to the present invention.
7 is a diagram of an embodiment showing a pressure regulator according to the present invention.
8 is a view of an embodiment showing a flow meter according to the present invention.
9 is a view of an embodiment showing a fire extinguishing water facility according to the present invention.
10 is a view of an embodiment showing a nitrogen generator according to the present invention.

Before describing various embodiments of the present invention in detail, it will be appreciated that the application is not limited to the details of the configuration and arrangement of components described in the following detailed description or shown in the drawings. The invention is capable of being implemented and practiced in other embodiments and of being carried out in various ways. Also, device or element orientation (e.g., "front", "back", "up", "down", "top", "bottom") The expressions and predicates used herein with respect to terms such as ", "left", "right", "lateral", etc. are only used to simplify the description of the present invention and related devices. Or it will be appreciated that it does not indicate or imply that an element simply must have a particular orientation. Also, terms such as “first” and “second” are used herein and in the appended claims for purposes of explanation and are not intended to indicate or imply any relative importance or intent.

The present invention has the following features to achieve the above object.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as being limited to the usual or dictionary meaning, and the inventor appropriately uses the concept of the term in order to explain his/her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, since the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, various alternatives may be used at the time of this application. It should be understood that there may be equivalents and variations.

Hereinafter, with reference to FIGS. 1 to 10, the operating structure of the facility management system of the LNG supply system according to a preferred embodiment of the present invention will be described in detail.

The present invention is a facility management system operating structure of the LNG supply system 100. In the case of this LNG supply system 100, special care is required because cryogenic LNG and high-pressure equipment are used, and equipment as a facility management program. It is possible to check the replacement cycle, but since the operator needs to cope with various situations, it is necessary to have a good understanding of the characteristics of various major facilities constituting the LNG supply system 100.

In the facility management system operating structure of the LNG supply system 100, a storage tank 20, a BOG processing facility 30, a vaporizer 24, an NG heater 25, an NG buffer tank 27, and a static pressure facility 28 , a flow meter 29, a fire extinguishing water facility 50, and a nitrogen generator 51.

The storage tank 20 includes a low-pressure storage tank 21 in which LNG is charged from the first tank lorry 10 and a high-pressure storage tank 22 in which LNG in the low-pressure storage tank 21 is transported and stored by an LNG pump 23 is composed of

In the following, it will be described in detail by dividing it into a low pressure storage tank 21 and a high pressure storage tank 22.

1. Low pressure storage tank (21) (TK-101, low pressure LNG storage tank)

go. The capacity of the low-pressure storage tank 21 is designed to be 100㎥, operating temperature -196~40℃, maximum operating pressure 1.1MPa, and LNG tank-lorry or Iso-tank transported from the land can be transported without a separate transfer device. , In order to unload the storage tank 20 with the differential pressure of the tank lorry 10, it is a specially designed double structure vacuum powder insulated cylindrical storage tank designed to minimize heat intrusion from the outside, and the pressure inside the tank is used as the working pressure It is equipped with attached vaporizer, pressure regulator, safety valve, BOG automatic release valve, pressure and temperature transmitter, etc. to keep the temperature constant, monitored in the control room, and designed to operate remotely and automatically.

me. The low-pressure storage tank 21 is equipped with two PSV (Purge Solenoid Valve, safety valve) and two Bursting Disks, and the setting pressure of the PSV (PSV Setting) must be maintained at 1.0 MPa or less. When the pressure of the tank 21 rises above the setting pressure (1.0 MPa), the PSV operates to release NG or LNG, and when the pressure goes down below the PSV setting pressure, it returns and blocks the discharge.

all. The bursting disk (rupture plate) for preventing pressure rise is made of 1.2 MPa, and it is characterized by the fact that once the bursting disk is ruptured due to a pressure rise, it does not return. Even if the Bursting Disk is custom-made at 1.2 MPa, the bursting pressure may change depending on the degree of scratch on the surface, so special attention is required when storing and working with the Bursting Disk spare.

la. Since the main purpose of the low-pressure storage tank 21 is for loading and unloading and storing LNG, and not for supply, supply to the vaporizer 24, which will be described later, is not possible. ) (TK-102) only through LNG supply.

mind. If LNG is to be unloaded, the internal pressure must be 0.5 MPa or less (for reference, the maximum pressure of Tank-lorry is 0.7 MPa) for smooth unloading before unloading. Considering that the BOG temperature has risen, the BOG of the tank lorry 10 is injected into the upper part of the low pressure storage tank 21 about 2 to 3 times to cool down to reduce the temperature gap.

bar. In order to increase the internal pressure of the low-pressure storage tank 21, it can be pressurized using a self-pressurization line (PBC), but in the case of the low-pressure storage tank 21, PBC is used unless there is a special case (maintenance, failure of the LNG pump 23). do not recommend If pressurization occurs in a special case, keep an eye on pressure fluctuations during pressurization and be careful not to exceed 80% of the maximum pressure (1.0 MPa) of the low pressure storage tank 21.

2. LNG pump (23) (P-201/202)

go. A device for transferring LNG stored in the low-pressure storage tank 21 to the high-pressure storage tank 22 operating at the operating pressure. , When necessary, it is a device for transferring LNG from the low pressure storage tank 21 to the high pressure storage tank 22.

me. Since the LNG pump 23 rotates using LNG as a lubricant, make sure that the LNG pump 23 is sufficiently cooled and the LNG level is sufficiently filled. It must be operated, and it must be checked that the LNG level is over 80% and the inlet temperature (TE-201) where LNG flows in is below -135℃.

all. In order to operate the LNG pump 23, the front valve (discharge valve (V1) of the low pressure storage tank 21) (ESV-101A, when the first (P-201) of the two LNG pumps 23 is operated, the LNG pump 23 ) When the inlet valve (V2) (AOV-201) or the second (P-202) of the two LNG pumps (23) is operated, the inlet valve (V2) (AOV-202) and the manual valve ( RS112A)), open the return valve (V3) (return valve AOV-203, a valve for recovering LNG from the LNG tank to the low pressure storage tank (21)) to raise the level of the LNG pump (23), , When operating one of the two LNG pumps 23 (P-201), open the manual valve RS-206 (or RS-207 when operating P-202) and wait for about 10 minutes or more.

la. Manual Valve RS212, RS215, RS102B, RS-104B Open

mind. If the LNG level is completely elevated, the return valve is closed after a stabilization period of about 10 minutes, and the upper valve (AOV-102B) located on the upper side of the high-pressure storage tank (22) (TK-102) at the rear of the LNG pump (23) is opened. do. (If the level of the high-pressure storage tank 22 (TK-102) is less than 20%, open the lower valve (AOV-103B) located on the lower side of the high-pressure storage tank 22 to inject the lower part)

bar. Operate the LNG pump 23 and check if pressure is formed in the pressure measuring device (PT-201) of the LNG pump 23 during operation.

buy. The level and pressure of the low-pressure storage tank (21) (TK-101) and the level and pressure of the high-pressure storage tank (22) (TK-102) are continuously monitored, and when the level to be charged is reached, the LNG pump (23 ) is disabled.

ah. After operating the LNG pump (23), close the inlet valve (V2) (AOV-201 or AOV-202) and open the return valve (V3) (AOV-203).

ruler. If the LNG pump (23) needs to be operated frequently, it is advantageous to open the inflow valve (V2) (AOV-201 or AOV-202) without closing it to keep the LNG level constant and prepare for operation when necessary, but low pressure storage It should be taken into account that the rate at which the pressure in the tank 21 (TK-101) rises increases.

3. High-pressure storage tank (22) (TK-102, high-pressure LNG tank)

go. The capacity of the high-pressure storage tank 22 is 20㎥, operating temperature -196 ~ 40 ℃, maximum operating pressure 1.5MPa, supplying NG, the fuel gas required for the operation of the LNG co-fired generator, at a stable pressure without a separate compression device as the operating pressure. As a cryogenic tank designed to operate at high pressure, an attached vaporizer and pressure regulator, safety valve, BOG automatic release valve, pressure and temperature transmitter, etc. It is designed so that it can be operated remotely while monitoring in the control room.

me. The high-pressure storage tank 22 is designed to have a maximum operating pressure (PSV setting) of 1.5 MPag and must be maintained below it, and the pressure rise prevention bursting disk is 1.6 MPag, and once the bursting disk operates, it cannot be restored. Since all of the LNG stored in the high-pressure storage tank 22 may be exhausted, care must be taken about overpressure.

all. Since the main purpose of the high-pressure storage tank 22 is to supply LNG, when the LNG pump 23 transfers the LNG in the low-pressure storage tank 21, it is supplied to the vaporizer 24 so that it can be vaporized, so that NG supply can be smoothly To do this, it is advantageous to maintain the LNG level at 40% or more and 85% or less, and maintain the pressure at 1.05 ± 0.1 MPa.

la. The high-pressure storage tank 22 needs to maintain the BOG pressure around 1 MPa for smooth NG supply. The current pressure is set at about 1.05 MPa, and if there is no use, the pressure of the high-pressure storage tank (22) increases rapidly, so the pressure fluctuation must be continuously monitored to prepare for overpressure. ) must be careful not to exceed 80% of the maximum pressure (1.5MPa).

The vaporizer 24 vaporizes the LNG received from the above-described high-pressure storage tank 22 through heat exchange with the outside atmosphere to make it NG, and two of them are installed in parallel to be replaced and used continuously. A more detailed explanation is as follows.

4. Vaporizer (24) (V-301/302, LNG atmospheric vaporizer)

go. It is a device that receives cryogenic LNG stored in the high-pressure storage tank 22 through a pipe and vaporizes liquefied gas by heat exchange with the outside atmosphere while passing through the heat sink of the vaporizer. The performance of the vaporizer 24 is It is also connected to the stable supply of NG.

me. As the vaporizer 24 continues to be used, frost adheres to the outside of the pin to hinder heat exchange, so at an appropriate time, open/close the AOV installed on the inlet side of another vaporizer 24 installed in parallel to replace it. let it drive

The NG heater 25 is a part that heats the NG having a temperature lower than the atmospheric temperature by exchanging heat with the air to room temperature during the winter season.

5. NG heater (25) (H-401/402, NG Heater)

Since the NG gas supplied from the atmospheric vaporizer 24 described above is lower than the ambient temperature in the winter due to heat exchange with the atmosphere, in order to supply it at room temperature (20 ° C) to the place of use, an electrothermal hot water type NG heater 25 is used It is a device for heating the temperature of the supply gas to room temperature (20 ℃) and supplying it.

The odor injection facility 26 is a part that mixes the odorant with NG heated to room temperature through the NG heater 25.

6. Odor injection equipment (26) (O-701)

go. Since LNG is an odorless gas, it is difficult to distinguish by smell when leaked, so by mixing and supplying an odorant to the supplied gas (NG that has passed through the NG heater 25), to find the leak state or leak when leaking to the outside It is a device for

me. Odorless stock solution can smell far away even with a slight leak, which can cause civil complaints, so care must be taken, and leaks must be checked at all times. should be used.

all. When servicing the odor injection facility 26, it is necessary to install a curtain with a vinyl or the like so that the odor does not spread to the surroundings. After maintenance, work tools and vinyl should be treated with neutralizer.

The NG buffer tank 27 is stored after NG heated to room temperature is mixed with the odorant through the odor injection facility 26, so that it is possible to check whether or not the leak is leaked and the location of the leak by smell, and the BOG treatment facility 30 to be described later ) and mixed storage tank with BOG.

7. NG buffer tank (27) (D-501, NG Buffer Tank)

go. Appropriate capacity to mix vaporized, heated, and odorized NG through the NG heater 25 and BOG introduced from the BOG processing facility to be described later into a gas with a uniform calorific value and prevent pressure hunting to stably supply gas It is a device that plays an important role in supplying the power plant at a stable pressure to the NG buffer tank (27).

me. Since the NG usage of the generator is flexible, as a final tank to act as a buffer against rapid usage, the pressure of the NG buffer tank 27 is set to 1.0±0.1MPag in order to supply the constant pressure (0.7Mpag) to the constant pressure even with the fluid usage. It is advantageous to keep

In this way, the NG of the NG buffer tank 27 is adjusted to a preset supply pressure through the constant pressure facility 28 according to the required amount of use of the place of use, and then supplied according to the flow rate through the flow meter 29. In the following, the constant pressure equipment 28 and the flowmeter 29 will be described in detail.

8. Static pressure facility (28) (G-601)

go. After adjusting the NG gas stored in the NG buffer tank 27 through the vaporizer 24 and the NG heater 25 to the supply pressure (0.70 to 0.75 MPag), MOV (opening/closing valve) as a facility to supply to the power plant, Filter, emergency shut-off device, pressure regulator, recorder, and PSV are installed.

me. In principle, both MOVs are operated in an open state, and it is recommended to conduct an operation test at least once a week considering the flow rate.

all. The filter periodically checks the degree of differential pressure, and if the meter value exceeds 0.2 bar, after disassembly and inspection, open the upper cover and replace the cartridge if necessary.

la. The emergency shut-off device periodically checks the front part to check whether it is working, and when it is blocked by operation, checks whether there is overpressure, and turns it 90 degrees to the left using the handle lever to unlock it.

mind. The pressure regulator is set and operated with the pressure to meet the user's required pressure (0.7MPag). With both rows of MOV-601 and 602 open, the pressure regulator in row A of the regulator is adjusted to 0.75MPag and the pressure regulator in row B to 0.72MPa. It is recommended to maintain the current state until the user requests a change in supply pressure.

bar. When pressure adjustment is necessary due to the user's supply pressure change request, remove the adjusting screw cap of the pressure regulator, and the adjusting screw appears. Then, loosen the locknet and adjust the adjusting screw. When there is a flow rate, watch PG-601 and adjust it to the desired pressure.

9. Flow meter (29) (FT-601/2, NG flow meter)

go. The flowmeter 29 has a dual turbinemeter installed at the rear of the pressure regulator, and the usage range is 5 to 100㎥ / h before correction, so the generator usage is flexible, so it is desirable to open and operate both rows.

me. The Turbinemeter output pulse is sent to the compensator, and the compensator sends the corrected value as integrated value (Pulse) and instantaneous value (mA) to PLC (HMI (40) (Human Machine Interface using SCADA S/W)).

all. Since the compensator (SF-2200) is not connected to 485 communication, you can modify various parameter values by connecting it to a notebook computer using the USB port, and the integrated value (pulse) sent from the compensator to the control room (PLC, HMI (40)) And the rate and range of instantaneous value (mA) can be set separately, and the correction factor can be modified if necessary. Correction of the correction factor is not recommended unless it is due to fluctuations or errors in flow values.

la. If you press the button at the bottom right of the counter value and compensator display of the turbinemeter, the correction value and the meter value come out, so record it more than once a day to monitor the daily usage.

The BOG processing facility 30 heats the BOG recovered through the BOG vaporizers 24 and 31 through heat exchange with the atmosphere in order to reuse the BOG generated in the storage tank 20 as NG, thereby producing a BOG buffer After storing in the tank 32, the stored BOG is compressed by passing through the BOG compressor 33.

Hereinafter, the BOG processing facilities 30 such as the BOG vaporizer 31, the BOG buffer tank 32, and the BOG compressor 33 will be described.

10. BOG vaporizer (31) (H-701)

In order to recover and recycle the low-temperature (ultra-low temperature) BOG generated in the storage tank 20 and piping to the place of use, it is warmed by heat exchange with the atmosphere while passing through the BOG vaporizer 31, and then safely compressed (BOG compressor 33 )) is a device for supplying.

11. BOG buffer tank (32) (D-701, BOG Suction Drum or BOG buffer tank)

go. The BOG buffer tank 32 is a tank for temporarily storing BOG generated in the low pressure storage tank 21 and the high pressure storage tank 22 by raising the temperature in the BOG vaporizer 31 (H-701), and the BOG compressor (33 ) (BOG compressor) to maintain a constant pressure and to maximize heating.

me. Equipped with an oxygen meter that measures the amount of oxygen in the BOG buffer tank 32 and stops supply when 3% or more is detected in BOG. It is a device for storing and supplying a certain amount of BOG to the BOG compressor 33 so that the BOG compressor 33 operates stably and constantly, and also maximizing the heating effect.

12. BOG Compressor (33) (C-701, BOG Compressor)

go. As a device for compressing BOG generated in the storage tank 20 (low pressure storage tank 21, high pressure storage tank 22) and transferring it to the NG buffer tank 27 (D-501), both the front and rear valves are Check that it is open and drive.

me. The operation of the BOG compressor (33) requires checking the pressure of the front and rear ends (ex: maintaining the pressure of the rear end below 1.3 MPa), and basically the frequency is set at 60 Hz, and at 60 Hz, a break of about an hour for every 3 hours of continuous operation It seems to be helpful for the life of the BOG compressor (33). When the frequency is lowered, the continuous operation time becomes longer. During the operation of the BOG compressor (33), the oil pressure must be maintained at 2-3 bar, and when it is insufficient, it must be supplemented and the oil must be completely replaced once every two years.

la. The operation of the BOG compressor (33) on the panel is divided into bypass operation and inverter operation. Bypass operation is not recommended except for special matters (maintenance, inverter failure).

mind. The operation of the BOG compressor (33) in HMI (40) is divided into automatic operation and manual operation. In manual operation, the front and rear valve open, tank pressure, etc. are continuously monitored and operated. In automatic operation mode, the pressure of the low pressure storage tank (21)/high pressure storage tank (22), BOG buffer tank (32), and NG buffer tank (27) (PT-101A/B, PT-701, PT-501) is monitored. to drive automatically.

The fire extinguishing water facility 50 is as follows.

13. Fire extinguishing facility (50)

go. Facility for cooling the heat of the storage tank 20 (low pressure storage tank 21 / high pressure storage tank 22, BOG buffer tank 32, NG buffer tank 27, etc.) in preparation for a fire that may occur Furnace, it is a facility that serves to cool the heat by spraying curtain-type water to the low-pressure storage tank (21) / high-pressure storage tank (22). It is divided into an underground water tank, a water supply device, and a pump. To fill more water, and in case of shortage, open SV-901 to supply and fill. Water supply can be operated manually and automatically.

me. The water pump to be operated in an emergency should be operated twice a month for test operation. When operating, supply water through the funnel at the top of the water pump and operate it, and check whether the return valve (V3) is open before operating it. .

The nitrogen generator 51 is as follows.

14. Nitrogen generator (51).

The nitrogen generator 51 is an important element because it is a driving force for operating various open/close valves (AOV) installed in the LNG supply system 100. If the nitrogen generator 51 does not operate, the AOV does not operate, so NG (LNG) supply may be interrupted, so special attention is required and periodic inspection is required.

As described above, although the present invention has been described by the limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the following by those skilled in the art to which the present invention belongs Of course, various modifications and changes are possible within the scope of equivalents of the claims to be described.

10: tank lorry 20: storage tank
21: low pressure storage tank 22: high pressure storage tank
23: LNG pump 24: vaporizer
25: NG heater 26: site injection facility
27: NG buffer tank 28: static pressure facility
29: flow meter 30: BOG treatment facility
31: BOG vaporizer 32: BOG buffer tank
33: BOG compressor 40: HMI
50: fire extinguishing facility 51: nitrogen supply device
100: LNG supply system
V1: discharge valve
V2: inlet valve
V3: return valve

Claims (5)

It is an operation structure of the facility management system of the LNG supply system 100 consisting of four stages of LNG charging, LNG transfer, NG supply, and BOG use,
A storage tank 20 composed of a low-pressure storage tank 21 in which LNG is filled from the tank lorry 10 and a high-pressure storage tank 22 in which LNG in the low-pressure storage tank 21 is transported and stored by the LNG pump 23;
In order to reuse the BOG generated in the storage tank 20 as NG, after warming the BOG recovered through the BOG vaporizer 31 through heat exchange with the atmosphere and storing it in the BOG buffer tank 32, the stored BOG BOG processing facility 30 to be compressed by passing through the BOG compressor 33;
Vaporizers 24 that vaporize the LNG received from the high-pressure storage tank 22 through heat exchange with the outside atmosphere to make it NG, and two vaporizers 24 installed in parallel to be operated for replacement and continuously used;
During the winter season, an NG heater 25 that heats the NG having a temperature lower than the air temperature by exchanging heat with the air to room temperature;
NG heated to room temperature is stored after mixing the odorant through the odor injection facility 26, so that leaks and leak locations can be checked by odor, and NG mixed with BOG that has passed through the BOG treatment facility 30 buffer tank 27;
In order to cool the heat of the storage tank 20 in case of fire, a fire extinguishing water facility 50 composed of a water tank, a water supply device, and a pump;
A nitrogen generator 51 supplying nitrogen for operating the valve of the LNG supply system 100; consists of,
The NG of the NG buffer tank 27 is adjusted to a preset supply pressure through the static pressure facility 28 according to the required usage amount of the place of use, and then supplied according to the flow rate through the flow meter 29. ,
The low pressure storage tank 21 is
LNG is transferred by the differential pressure of the tank lorry 10 without a transfer device, the internal pressure is kept constant at 1.0 MPa or less, and remote automatic operation is possible.
A safety valve and rupture disk are installed so that the pressure can be released by operating when the internal pressure exceeds 1.0 MPa.
When loading and unloading LNG, the facility management system operating structure of the LNG supply system, characterized in that the internal pressure is maintained at 0.5 MPa or less.
According to claim 1,
The high-pressure storage tank 22 is
The internal pressure is kept constant at 1.5 MPa or less, and remote automatic operation is possible.
A safety valve and rupture disk are installed so that the pressure can be released by operating when the internal pressure exceeds 1.5 MPa.
The facility management system operating structure of the LNG supply system, characterized in that the inside is filled with LNG to a water level of 40% or more to 85% or less, and the internal pressure is maintained at 1.05 ± 0.1 MPa.
According to claim 1 or 2,
The LNG pump 23 is
It is pre-cooled because it is driven by using LNG as a lubricant,
It is operated when the internal LNG level is above 80% and the inlet temperature connected to the low pressure storage tank 21 is below -135 ° C.
When driving
A discharge valve (V1) of the low pressure storage tank (21),
The inlet valve V2 of the LNG pump 23,
After opening the return valve (V3) for recovering LNG from the LNG pump (23) to the low-pressure storage tank (21), LNG is transferred until the filling level in the high-pressure storage tank (22) is satisfied. Supply system facility management system operating structure.
According to claim 1,
The BOG compressor 33,
The frequency is set to 60Hz, and after 3 hours of continuous operation at 60Hz, the operation is stopped for one hour,
The front and rear pressures of the BOG compressor 33 are maintained at a preset pressure,
The operating structure of the facility management system of the LNG supply system, characterized in that the pressure of the internal oil is maintained at 2 to 3 bar during operation and is replaced once every two years.
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