LNG temporary emergency repair supply system

Abstract

The utility model discloses an LNG (Liquefied Natural Gas) temporary emergency repair supply system which comprises a first tank car, a second tank car, two-speed supply equipment, a first connecting pipe, a second connecting pipe and a third connecting pipe, the second tank car is respectively connected with a first gas phase pipe, a first liquid phase pipe and a first conveying pipe; according to the system, the first tank car, the second tank car and the two quick supply devices are arranged, and the first gas phase pipe, the first liquid phase pipe, the first conveying pipe, the first connecting pipe, the second connecting pipe, the third connecting pipe, the second gas phase pipe, the second liquid phase pipe and the second conveying pipe are arranged, so that the first tank car or the second tank car can be connected with the two quick supply devices at the same time; air can be alternately supplied to the two rapid supply devices through the two tank cars, continuous air source switching operation of the rapid supply devices can be met, and the air supply amount can be increased through combined use of the devices.

Description

Technical Field

[0001] The utility model relates to the technical field of gas, in particular to an LNG temporary emergency repair supply system. Background Art

[0002] With the rapid development of urban gas, the number of industrial, commercial and residential users in the region has doubled, which also brings difficulties to the wide range of gas outages during the subsequent emergency repair and pipeline connection operations. This kind of gas outage operation not only releases a large amount of natural gas or combustion flue gas into the air during the release process, which wastes natural gas, but also poses safety hazards when resuming gas supply, and may even lead to gas accidents. The rational use of liquefied natural gas as an emergency gas source for pipeline network emergency repair and maintenance, and the localized gas supply during the pipeline network emergency repair or maintenance process can effectively reduce or even eliminate gas outages during pipeline network emergency repair or maintenance, and avoid the safety risks that may be caused by resuming gas supply. Therefore, the emergency gas supply and rapid supply equipment have been optimized.

[0003] Based on previous temporary gas supply plans and on-site inspections of temporary gas supply sites, it was found that most temporary gas supply environments require two 500m³ / h LNG rapid supply equipment and multiple 56m³ LNG tank trucks to maintain a gas supply of ≤1000m³ / h. Currently, LNG rapid supply equipment and tank trucks are used in a one-to-one combination. The disadvantage of this combination is that when one set of LNG gas source tank trucks is switched, the corresponding LNG rapid supply equipment in the combination must also stop supplying gas, resulting in a 500m³ reduction in gas supply per hour, which may affect the stable gas supply to industrial and commercial users in the temporary gas supply area during peak hours. Moreover, due to the large size of the LNG rapid supply equipment, the temporary gas supply site is limited by the size of the work site and the equipment structure, and cannot accommodate multiple tank trucks for temporary gas source switching. As a result, the tank trucks need to be constantly moved when switching, which increases the safety risk factor on site.

[0004] The announcement number is CN202024072U, and it relates to a movable temporary liquefied natural gas (LNG) supply device, including an LNG cylinder, an odorizer, a pressure regulator, a low-temperature full-open safety valve, a shut-off valve, and a busbar. It is characterized by a skid-mounted structure consisting of three parts: a bottle assembly skid, a gas supply skid, and equipment. The bottle assembly skid is a chassis with a fixed frame welded to the chassis, and the LNG cylinder is fixed to the fixed frame by a steel belt; the busbar is composed of a main pipe and a branch pipe, and the busbar, shut-off valve, odorizer, and pressure regulator are all fixed to the chassis to form a parallel pipeline; the low-temperature full-open safety valve and low-temperature pressure gauge are located on the branch pipe of the busbar. However, this gas supply equipment cannot continuously supply gas, and ventilation requires stopping the gas for ventilation, which is inconvenient to operate. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an LNG temporary emergency repair supply system that is easy to operate and can achieve uninterrupted gas exchange.

[0006] To achieve the above objectives, the present invention provides a solution: an LNG temporary emergency repair supply system, comprising a first tank truck, a second tank truck, a two-speed supply device, a first connecting pipe, a second connecting pipe, and a third connecting pipe, wherein the first tank truck is respectively connected to a first gas phase pipe, a first liquid phase pipe, and a first delivery pipe, and the second tank truck is respectively connected to the first gas phase pipe, the first liquid phase pipe, and the first delivery pipe;

[0007] The quick supply equipment is respectively connected to a second gas phase pipe, a second liquid phase pipe, and a second delivery pipe. One end of the first connecting pipe is respectively connected to the two first gas phase pipes, and the other end is respectively connected to the two second gas phase pipes. One end of the second connecting pipe is respectively connected to the two first liquid phase pipes, and the other end is respectively connected to the two second liquid phase pipes. One end of the third connecting pipe is respectively connected to the two first delivery pipes, and the other end is respectively connected to the two second delivery pipes.

[0008] The beneficial effects of the present invention are: realizing temporary emergency repair supply, the system is provided with a first tank truck, a second tank truck, and two quick supply devices, and through the first gas phase pipe, the first liquid phase pipe, the first conveying pipe, the first connecting pipe, the second connecting pipe, the third connecting pipe, the second gas phase pipe, the second liquid phase pipe, and the second conveying pipe, the first tank truck or the second tank truck can be connected to two quick supply devices at the same time, so that the two tank trucks can realize alternating gas supply to the two quick supply devices, which can meet the uninterrupted gas source switching operation of the quick supply equipment, and can also realize the increase of gas supply volume through the combined use of equipment. The overall structure is simple and easy to operate, and it plays an important role in the uninterrupted supply of natural gas in emergencies. As a practical emergency energy supply supporting equipment, it has great market competitiveness.

[0009] Furthermore, the first gas phase pipe, the first liquid phase pipe, the first delivery pipe, the second gas phase pipe, the second liquid phase pipe, and the second delivery pipe are all provided with low-temperature stop valves.

[0010] Furthermore, the second liquid phase pipe is connected to the first discharge pipe, and the two first discharge pipes are connected to the second discharge pipe. After adopting the above structure, the utility model can discharge the gasified natural gas in the second liquid phase pipe through the first discharge pipe and the second discharge pipe according to actual conditions.

[0011] Furthermore, a first switch valve is provided on the first vent pipe.

[0012] Furthermore, the outer walls of the first liquid phase pipe, the second liquid phase pipe, and the second connecting pipe are all provided with a heat-insulating layer. After adopting the above structure, the utility model reduces the gasification of part of the liquefied natural gas due to the increase in temperature during the transportation of liquefied natural gas.

[0013] Furthermore, the thermal insulation layer is made of thermal insulation cotton.

[0014] Furthermore, the rapid supply equipment includes an air intake pipe, an air duct, two air-temperature vaporizers, a first pressure regulator, and an odorizing device. The second gas phase pipe is connected to the air intake pipe, the second liquid phase pipe and the second delivery pipe are connected to the two air-temperature vaporizers in a one-to-one correspondence, the two air-temperature vaporizers are connected to the first pressure regulator, the first pressure regulator and the air intake pipe are connected to the air duct, and the air duct is provided with a second pressure regulator. The utility model adopts the above-mentioned structure, integrating the delivered gaseous natural gas with the gaseous natural gas converted from liquefied natural gas by the air-temperature vaporizers and regulating the pressure. This allows for stable output of natural gas at a set pressure value and delivery to users, providing high overall safety.

[0015] Furthermore, the two air-temperature vaporizers are commonly connected to an over-liquid prevention device, and the over-liquid prevention device is connected to the first pressure regulator.

[0016] Furthermore, the rapid supply equipment also includes an odorizing device, which is connected to the air duct and is located upstream of the second pressure regulator.

[0017] Furthermore, a flow meter is provided on the air duct, and the flow meter is located downstream of the second pressure regulator.

[0018] Furthermore, the air inlet pipe and the air guide pipe are both provided with safety valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the overall connection structure diagram of the utility model.

[0020] Figure 2 This is a diagram showing the internal structure of the quick-supply device of the present utility model.

[0021] Figure 3 This is a water pressure test data diagram of the utility model.

[0022] Figure 4 This is the air-water pressure test data diagram of the present utility model.

[0023] Among them, 11 is the first tank truck, 12 is the second tank truck, 21 is the first gas phase pipe, 22 is the first liquid phase pipe, 23 is the first delivery pipe, 31 is the first delivery pipe, 32 is the second delivery pipe, 33 is the third delivery pipe, 4 is the first rapid supply equipment, 41 is the air intake pipe, 42 is the air guide pipe, 43 is the air temperature vaporizer, 44 is the first pressure regulator, 45 is the odorizing device, 46 is the second pressure regulator, 47 is the flow meter, 48 is the safety valve, 49 is the over-liquid prevention device, 51 is the second gas phase pipe, 52 is the second liquid phase pipe, 53 is the second delivery pipe, 61 is the insulation layer, 62 is the first vent pipe, 63 is the second vent pipe, 64 is the first switch valve, and 7 is the low-temperature stop valve. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] See attached Figure 1 To the attached Figure 2 As shown, a temporary emergency repair supply system for LNG includes a first tank truck 11, a second tank truck 12, a two-speed supply device 4, a first connecting pipe 31, a second connecting pipe 32, and a third connecting pipe 33. The first tank truck 11 is respectively connected to the first gas phase pipe 21, the first liquid phase pipe 22, and the first delivery pipe 23, and the second tank truck 12 is respectively connected to the first gas phase pipe 21, the first liquid phase pipe 22, and the first delivery pipe 23.

[0027] A quick supply device 4 is respectively connected to a second gas phase pipe 51, a second liquid phase pipe 52, and a second delivery pipe 53. One end of the first connecting pipe 31 is respectively connected to the two first gas phase pipes 21, and the other end is respectively connected to the two second gas phase pipes 51. One end of the second connecting pipe 32 is respectively connected to the two first liquid phase pipes 22, and the other end is respectively connected to the two second liquid phase pipes 52. One end of the third connecting pipe 33 is respectively connected to the two first delivery pipes 23, and the other end is respectively connected to the two second delivery pipes 53.

[0028] In this embodiment, low-temperature stop valves 7 are provided on the first gas phase pipe 21 , the first liquid phase pipe 22 , the first delivery pipe 23 , the second gas phase pipe 51 , the second liquid phase pipe 52 , and the second delivery pipe 53 .

[0029] In this embodiment, the second liquid phase pipe 52 is connected to a first discharge pipe 62 , and the two first discharge pipes 62 are commonly connected to a second discharge pipe 63 ; a first on-off valve 64 is provided on the first discharge pipe 62 .

[0030] In this embodiment, a thermal insulation layer 61 is provided on the outer side walls of the first liquid phase tube 22 , the second liquid phase tube 52 , and the second connecting tube 32 . The thermal insulation layer 61 is made of thermal insulation cotton.

[0031] In this embodiment, the rapid supply equipment 4 includes an air intake pipe 41, an air guide pipe 42, two air-temperature vaporizers 43, a first pressure regulator 44, an odorizing device 45, and an odorizing device 45. The second gas phase pipe 51 is connected to the air intake pipe 41, and the second liquid phase pipe 52 and the second delivery pipe 53 are respectively connected to the two air-temperature vaporizers 43 in a one-to-one correspondence. The two air-temperature vaporizers 43 are commonly connected to the first pressure regulator 44. The first pressure regulator 44 and the air intake pipe 41 are commonly connected to the air guide pipe 42. A second pressure regulator 46 is provided on the air guide pipe 42; the two air-temperature vaporizers 43 are commonly connected to an over-liquid prevention device 49, and the over-liquid prevention device 49 is connected to the first pressure regulator 44; the odorizing device 45 is connected to the air guide pipe 42, and the odorizing device 45 is located upstream of the second pressure regulator 46.

[0032] In this embodiment, a flow meter 47 is provided on the air duct 42 , and the flow meter 47 is located downstream of the second pressure regulator 46 ; and a safety valve 48 is provided on both the air inlet pipe 41 and the air duct 42 .

[0033] In this embodiment, the specific temporary emergency repair supply process is as follows: first, the first tank truck 11 or the second tank truck 12 or the first tank truck 11 and the second tank truck 12 are selected, and then the first tank truck 11 is respectively connected to the first gas phase pipe 21, the first liquid phase pipe 22, and the first delivery pipe 23, or the second tank truck 12 is respectively connected to the first gas phase pipe 21, the first liquid phase pipe 22, and the first delivery pipe 23;

[0034] When the first tank truck 11 begins to unload, most of the liquefied natural gas in the first tank truck 11 is transported to the two second liquid phase pipes 52 through the first liquid phase pipe 22 and the second connecting pipe 32, and then transported to the two speed supply devices 4 accordingly. In the later stage of unloading, after most of the liquefied natural gas has been transported away, the first gas phase pipe 21 and the first delivery pipe 23 are opened, and the first gas phase pipe 21 transports the gaseous natural gas and transports it to the two second gas phase pipes 51. The first delivery pipe 23 transports the remaining liquefied natural gas and transports it to the two second delivery pipes 53.

[0035] In the rapid supply equipment 4, the second gas phase pipe 51 transports gaseous natural gas to the air inlet pipe 41, and the air-temperature vaporizer 43 receives the liquefied natural gas transported by the second liquid phase pipe 52 or the second delivery pipe 53, and then converts the liquefied natural gas into gaseous natural gas. The gaseous natural gas is pressure-regulated by the anti-over-liquid device 49 and the first pressure regulator 44 in turn, and is mixed with the gaseous natural gas delivered by the air inlet pipe 41, and then transported to the air guide pipe 42, and is successively added with odorant and mixed with gaseous natural gas by the odorizing device 45, and the second pressure regulator 46 performs a second pressure regulation and flow meter measurement, and finally outputs it for temporary use by users, realizing temporary emergency repair supply of LNG. In this embodiment, one or two tank trucks can be used. If the two tank trucks are used alternately, alternating gas supply can be realized, that is, uninterrupted conversion and supply of natural gas sources can be realized. If the two tank trucks are used at the same time, the gas supply volume can be increased by using a combination of equipment.

[0036] See attached Figure 3 As shown, the system of this embodiment is subjected to a water pressure test, and the test parameters are:

[0037] Test pressure PT = 2.40 MPa;

[0038] Test medium: clean water;

[0039] Test temperature: room temperature ℃;

[0040] Holding time t=10min;

[0041] Ambient temperature: normal temperature ℃;

[0042] Inspection results:

[0043] Pressure drop △P: 0.00MPa;

[0044] No leakage, leakage location: none;

[0045] Pressure test conclusion: qualified.

[0046] See attached Figure 4 As shown, the system of this embodiment is subjected to an air pressure test, and the test parameters are:

[0047] Test pressure PT = 0.80 MPa;

[0048] Medium temperature: room temperature ℃;

[0049] Test medium: air;

[0050] Holding time t=10min;

[0051] Ambient temperature: normal temperature ℃;

[0052] Inspection results:

[0053] Use foaming agent to check for leakage;

[0054] Leakage location: None;

[0055] Leakage test conclusion: qualified.

[0056] In the on-site commissioning test, one gas source tanker simultaneously provided gas source to two rapid supply devices 4, with a gas supply volume of 10,000 Nm³ / h. At the same time, only two LNG tankers were needed on site to meet the uninterrupted gas source switching operation of the temporary supply equipment. Through the system of this embodiment, the entire gas source replenishment and switching process only takes 50 minutes, saving 50% of the efficiency, thereby improving work efficiency and reducing labor intensity. The traditional gas source replenishment and switching process takes 100 minutes.

[0057] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any person skilled in the art may, without departing from the scope of the present invention, utilize the technical content disclosed above to make further possible variations and modifications to the present invention, or to modify the present invention into equivalent embodiments with equivalent variations. Therefore, any equivalent variations made in accordance with the principles of the present invention without departing from the scope of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A temporary emergency repair supply system for LNG, comprising a first tank truck (11), a second tank truck (12), a two-speed supply device (4), a first connecting pipe (31), a second connecting pipe (32), and a third connecting pipe (33), characterized in that: The first tank car (11) is respectively connected to a first gas phase pipe (21), a first liquid phase pipe (22), and a first delivery pipe (23); the second tank car (12) is respectively connected to a first gas phase pipe (21), a first liquid phase pipe (22), and a first delivery pipe (23); The quick supply device (4) is respectively connected to a second gas phase pipe (51), a second liquid phase pipe (52), and a second delivery pipe (53); one end of the first connecting pipe (31) is respectively connected to the two first gas phase pipes (21), and the other end is respectively connected to the two second gas phase pipes (51); one end of the second connecting pipe (32) is respectively connected to the two first liquid phase pipes (22), and the other end is respectively connected to the two second liquid phase pipes (52); one end of the third connecting pipe (33) is respectively connected to the two first delivery pipes (23), and the other end is respectively connected to the two second delivery pipes (53).

2. The LNG temporary emergency repair supply system according to claim 1, characterized in that: The first gas phase pipe (21), the first liquid phase pipe (22), the first delivery pipe (23), the second gas phase pipe (51), the second liquid phase pipe (52), and the second delivery pipe (53) are all provided with low-temperature stop valves (7).

3. The LNG temporary emergency repair supply system according to claim 1, characterized in that: The second liquid phase pipe (52) is connected to a first discharge pipe (62), and the two first discharge pipes (62) are commonly connected to a second discharge pipe (63).

4. The LNG temporary emergency repair supply system according to claim 3 is characterized by: A first on-off valve (64) is provided on the first vent pipe (62).

5. The LNG temporary emergency repair supply system according to claim 1 is characterized in that: The outer walls of the first liquid phase tube (22), the second liquid phase tube (52), and the second connecting tube (32) are all provided with a thermal insulation layer (61).

6. The LNG temporary emergency repair supply system according to claim 1, characterized in that: The rapid supply device (4) includes an air intake pipe (41), an air guide pipe (42), two air-temperature vaporizers (43), a first pressure regulator (44), and an odorizing device (45). The second gas phase pipe (51) is connected to the air intake pipe (41). The second liquid phase pipe (52) and the second delivery pipe (53) are connected to the two air-temperature vaporizers (43) in a one-to-one correspondence. The two air-temperature vaporizers (43) are connected to the first pressure regulator (44). The first pressure regulator (44) and the air intake pipe (41) are connected to the air guide pipe (42). The air guide pipe (42) is provided with a second pressure regulator (46).

7. The LNG temporary emergency repair supply system according to claim 6, characterized in that: The two air-temperature vaporizers (43) are commonly connected to an over-liquid prevention device (49), and the over-liquid prevention device (49) is connected to the first pressure regulator (44).

8. The LNG temporary emergency repair supply system according to claim 6, characterized in that: The rapid supply device (4) further comprises an odorizing device (45), wherein the odorizing device (45) is connected to the air guide pipe (42), and the odorizing device (45) is located upstream of the second pressure regulator (46).

9. The LNG temporary emergency repair supply system according to claim 6, characterized in that: A flow meter (47) is provided on the air guide pipe (42), and the flow meter (47) is located downstream of the second pressure regulator (46).

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