Pipeline row pry used for being connected with LNG loading crane pipe

Abstract

The utility model discloses a pipeline row pry for connecting an LNG (Liquefied Natural Gas) loading arm. The pipeline row pry comprises a liquid inlet header pipe, a flash steam recovery pipe and an emptying header pipe which are arranged on a support frame, one end of the liquid inlet header pipe is a liquid inlet end, the outlet end of a liquid phase pipeline on the liquid inlet header pipe is used for being connected with a liquid phase opening of a loading crane pipe, and a liquid phase pipeline blow-down pipe is arranged on the liquid phase pipeline; one end of the flash steam recycling pipe is a flash steam discharging end, the input end of a flash steam connecting pipe on the flash steam recycling pipe is used for being connected with a gas phase opening of a loading crane pipe, and a gas phase pipeline blow-down pipe is arranged on the flash steam connecting pipe; one end of the emptying main pipe is an emptying main pipe outlet end, the emptying main pipe is connected with an emptying connecting pipe and an emptying branch pipe, the input end of the emptying connecting pipe is provided with a plurality of emptying connecting pipe interfaces, and the liquid phase pipeline emptying pipe and the gas phase pipeline emptying pipe are both communicated with the emptying branch pipe. The device has the advantages of high integration degree, compact structure, low manufacturing cost, small occupied area and convenience in conveying.

Description

Technical Field

[0001] The utility model relates to the technical field of liquefied natural gas transfer equipment, and particularly relates to a pipeline system for connecting with an LNG loading arm. Background Art

[0002] The LNG plant built at the wellhead of the gas field liquefies natural gas to form liquefied natural gas. The liquefied natural gas is timely transported out by cryogenic tank trucks.

[0003] At present, when the liquefied natural gas produced by the LNG plant is transported to the cryogenic tank truck, it is usually through a loading arm integrated with multiple pipeline connectors for transfer. One end of the loading arm is used to connect with the pipeline on the cryogenic tank truck, and at the same time, the other end of the loading arm is connected to the LNG liquid inlet pipeline, the return gas pipeline, the nitrogen purging pipeline and the drainage and venting pipeline. At present, the LNG liquid inlet pipeline, the return gas pipeline, the nitrogen purging pipeline and the drainage and venting pipeline at one end of the loading arm are all installed on site.

[0004] However, on-site installation has technical problems such as complex construction, long construction period, large occupied space, heavy and immovable pipelines, high installation cost, and inconvenient maintenance.

[0005] To overcome the above technical problems, the applicant has developed an integrated pipeline skid for connecting with an LNG loading arm, which is structurally compact, convenient for installation and transportation. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is: to provide a pipeline skid for connecting an LNG loading arm, which is structurally compact, prefabricated in advance, can effectively shorten the construction period, and can be reused.

[0007] To solve the above problems, the technical solution adopted by the utility model is: a pipeline skid for connecting an LNG loading arm, including a support frame, on which a liquid inlet main pipe, a flash gas recovery pipe and a vent main pipe are arranged in parallel.

[0008] One end of the liquid inlet main pipe is a liquid inlet end, a liquid phase pipeline is connected to the liquid inlet main pipe, the outlet end of the liquid phase pipeline is used to connect with the liquid phase port of the loading arm, and a liquid phase pipeline vent pipe is arranged on the liquid phase pipeline.

[0009] One end of the flash gas recovery pipe is a flash gas discharge end, the flash gas discharge end is on the same side as the liquid inlet end of the liquid inlet main pipe, a flash gas connection pipe is connected to the flash gas recovery pipe, the input end of the flash gas connection pipe is used to connect with the gas phase port of the loading arm, and a gas phase pipeline vent pipe is arranged on the flash gas connection pipe.

[0010] One end of the vent main pipe is the outlet end of the vent main pipe. The outlet end of the vent main pipe and the inlet end of the liquid inlet main pipe are on the same side. A vent connecting pipe and a vent branch pipe are connected to the vent main pipe. A number of vent connecting pipe interfaces for connecting with the vent interfaces of the loading crane pipes are provided at the input end of the vent connecting pipe. The liquid-phase pipeline vent pipe and the gas-phase pipeline vent pipe are both communicated with the vent branch pipe.

[0011] Further, for the above-mentioned pipeline skid for connecting LNG loading crane pipes, a liquid-phase pipeline safety valve and a liquid-phase pipeline gate valve are provided on the liquid-phase pipeline vent pipe.

[0012] Further, for the above-mentioned pipeline skid for connecting LNG loading crane pipes, a gas-phase pipeline safety valve and a gas-phase pipeline gate valve are provided on the gas-phase pipeline vent pipe.

[0013] Further, for the above-mentioned pipeline skid for connecting LNG loading crane pipes, a liquid-phase pipeline bypass vent pipe is also connected to the liquid-phase pipeline, and a gas-phase pipeline bypass vent pipe is also connected to the flash gas connecting pipe. The liquid-phase pipeline bypass vent pipe and the gas-phase pipeline bypass vent pipe are both communicated with a bypass converging pipe, and the bypass converging pipe is communicated with the vent branch pipe.

[0014] Further, for the above-mentioned pipeline skid for connecting LNG loading crane pipes, a liquid-phase pipeline bypass stop valve is provided on the liquid-phase pipeline bypass vent pipe, and a gas-phase pipeline bypass stop valve is provided on the gas-phase pipeline bypass vent pipe.

[0015] Further, for the above-mentioned pipeline skid for connecting LNG loading crane pipes, a nitrogen purging pipe is also provided on the support frame. One end of the nitrogen purging pipe is the nitrogen input end, and the other end of the nitrogen purging pipe is connected with a number of nitrogen output ports for connecting with the nitrogen ports on the loading crane pipes. The nitrogen input end and the inlet end of the liquid inlet main pipe are on the same side.

[0016] Further, for the above-mentioned pipeline skid for connecting LNG loading crane pipes, the liquid inlet main pipe and the liquid-phase pipeline are both coated with a cold insulation layer.

[0017] Further, for the above-mentioned pipeline skid for connecting LNG loading crane pipes, four corner positions on the inner side of the bottom of the support frame are respectively provided with foundation connection seats for installation and connection; a number of lifting lugs for hoisting are spacedly arranged on both sides of the bottom of the support frame.

[0018] Further, for a pipeline skid for connecting an LNG loading arm, the other end of the liquid inlet main pipe is a liquid inlet main pipe connection end, and a detachable first connection head is provided at the liquid inlet main pipe connection end; the other end of the flash gas recovery pipe is a flash gas recovery pipe connection end, and a detachable second connection head is provided at the flash gas recovery pipe connection end; the other end of the vent main pipe is a vent main pipe connection end, and a detachable third connection head is provided at the vent main pipe connection end.

[0019] The advantages of the present utility model are as follows: First, the structure is simple, the degree of integration is high, the structure is compact, the manufacturing cost is low, the floor area is small, and the transportation is convenient. Second, all pipelines are integrated on the support frame, so they can be prefabricated in advance, effectively saving the construction period of on-site construction, simplifying the construction process, and greatly improving the installation efficiency. Third, all pipelines are further optimized, the pipelines are simple and beautiful, which provides convenience for installation, disassembly and later maintenance. Fourth, once the pressure in the pipeline is too high, it can be relieved through the corresponding safety valve, and the safety performance is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a pipeline skid for connecting an LNG loading arm according to the present utility model.

[0021] Figure 2 is Figure 1 a three-dimensional structural diagram of a pipeline skid for connecting an LNG loading arm shown in the left view direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described in detail below with reference to the drawings and preferred embodiments.

[0023] As Figure 1 、 Figure 2 shown, a pipeline skid for connecting an LNG loading arm includes a support frame 1. Four corner positions on the inner side of the bottom of the support frame 1 are respectively provided with anchor connection seats 11 for installation and connection; a plurality of lifting lugs 12 for lifting are arranged at intervals on both sides of the bottom of the support frame 1. An inlet liquid main pipe 2, a flash gas recovery pipe 3, and a vent main pipe 4 are arranged in parallel on the support frame 1.

[0024] One end of the inlet liquid main pipe 2 is an inlet liquid end 201. A liquid phase pipeline 21 is connected to the inlet liquid main pipe 2. The outlet end 202 of the liquid phase pipeline 21 is used to be connected to the liquid phase port of the loading arm 7. A liquid phase pipeline vent pipe 22 is arranged on the liquid phase pipeline 21. In order to prevent low-temperature gas from being vaporized by heat, in this application, both the inlet liquid main pipe 2 and the liquid phase pipeline 21 are coated with a cold insulation layer 6. Figure 1 、 Figure 2 In Figure 2 order to show the inlet liquid main pipe 2 and the liquid phase pipeline 21, the cold insulation layer 6 thereon is disconnected, and only a partial cold insulation layer 6 is shown.Figure 1 , Figure 2 The loading arm 7 in

[0025] One end of the flash gas recovery pipe 3 is the flash gas discharge end 301, and the flash gas discharge end 301 and the liquid inlet end 201 of the liquid inlet main pipe 2 are on the same side. A flash gas connecting pipe 31 is connected to the flash gas recovery pipe 3. The input end 302 of the flash gas connecting pipe 31 is used to connect to the gas phase port of the loading arm 7, and a gas phase pipeline vent pipe 32 is provided on the flash gas connecting pipe 31.

[0026] One end of the vent main pipe 4 is the vent main pipe outlet end 401, and the vent main pipe outlet end 401 and the liquid inlet end 201 of the liquid inlet main pipe 2 are on the same side. A vent connecting pipe 41 and a vent branch pipe 42 are connected to the vent main pipe 4. A number of vent connecting pipe interfaces 411 for connecting to the vent interfaces of the loading arm 7 are provided at the input end of the vent connecting pipe 41. The liquid phase pipeline vent pipe 22 and the gas phase pipeline vent pipe 32 are both communicated with the vent branch pipe 42. A liquid phase pipeline safety valve 221 and a liquid phase pipeline gate valve 222 are provided on the liquid phase pipeline vent pipe 22. A gas phase pipeline safety valve 321 and a gas phase pipeline gate valve 322 are provided on the gas phase pipeline vent pipe 32.

[0027] In this embodiment, a liquid phase pipeline bypass vent pipe 23 is further connected to the liquid phase pipeline 21, and a gas phase pipeline bypass vent pipe 33 is further connected to the flash gas connecting pipe 31. The liquid phase pipeline bypass vent pipe 23 and the gas phase pipeline bypass vent pipe 33 are both communicated with a bypass converging pipe 43, and the bypass converging pipe 43 is communicated with the vent branch pipe 42. A liquid phase pipeline bypass stop valve 231 is provided on the liquid phase pipeline bypass vent pipe 23, and a gas phase pipeline bypass stop valve 331 is provided on the gas phase pipeline bypass vent pipe 33.

[0028] A nitrogen purge pipe 5 is further provided on the support frame 1. One end of the nitrogen purge pipe 5 is the nitrogen input 501 end, and the other end of the nitrogen purge pipe 5 is connected with a number of nitrogen output ports 502 for connecting to the nitrogen ports on the loading arm 7. The nitrogen input end 501 and the liquid inlet end 201 of the liquid inlet main pipe 2 are on the same side.

[0029] In addition, the other end of the liquid inlet main pipe 2 is a liquid inlet main pipe connection end, and a detachable first connection head 203 is provided at the liquid inlet main pipe connection end; the other end of the flash gas recovery pipe 3 is a flash gas recovery pipe connection end, and a detachable second connection head is provided at the flash gas recovery pipe connection end; the other end of the vent main pipe 4 is a vent main pipe connection end, and a detachable third connection head 403 is provided at the vent main pipe connection end. The purpose of adopting this structure is that two or more pipeline skids of the present utility model for connecting LNG loading arms can be spliced to suit the simultaneous loading operations of multiple tank trucks. Any two pipeline skids can be spliced. It only needs to connect the liquid inlet main pipe connection end of the previous liquid inlet main pipe 2 to the liquid inlet end of the next liquid inlet main pipe 2, connect the flash gas recovery pipe connection end of the previous flash gas recovery pipe 3 to the flash gas discharge end 301 of the next flash gas recovery pipe 3, and connect the vent main pipe connection end of the previous vent main pipe 4 to the vent main pipe outlet end 401 of the next vent main pipe 4.

[0030] The following is only illustrated by loading a single cryogenic tank truck. When it is necessary to transport liquefied natural gas into the cryogenic tank on the cryogenic tank truck, connect the outlet end 202 of the liquid phase pipeline 21 to the liquid phase port of the loading arm 7, connect the input end 302 of the flash gas connecting pipe 31 to the gas phase port of the loading arm 7, and connect the nitrogen output port 502 of the nitrogen purge pipe 5 to the nitrogen port on the loading arm 7.

[0031] The nitrogen from the nitrogen source passes through the nitrogen input end 501 of the nitrogen purge pipe 5 and the nitrogen output port 502, enters the cryogenic tank through the loading arm 7, so as to conduct nitrogen purge on the pipeline and the inside of the cryogenic tank, and the nitrogen in the cryogenic tank is discharged from the nitrogen discharge port on the cryogenic tank. After the purge is completed, the liquefied natural gas enters the cryogenic tank through the liquid inlet end 201 of the liquid inlet main pipe 2, the outlet end 202 of the liquid phase pipeline 21, and the loading arm 7. During the loading process, the cryogenic gas vaporized in the cryogenic tank is discharged and recovered through the gas phase port of the loading arm 7, the input end 302 of the flash gas connecting pipe 31, and the flash gas discharge end 301 of the flash gas recovery pipe 3.

[0032] Due to the provision of the liquid phase pipeline vent pipe 22 and the liquid phase pipeline safety valve 221, once the pressure in the liquid phase pipeline 21 is too high, the liquid phase pipeline safety valve 221 will open, and the liquefied natural gas in the liquid phase pipeline 21 will be discharged and recovered through the liquid phase pipeline vent pipe 22, the vent branch pipe 42, and the vent main pipe outlet end 401, which can effectively ensure the stable pipeline pressure during the loading process. The provision of the liquid phase pipeline bypass vent pipe 23 further improves the safety of the pipeline. Once the liquid phase pipeline vent pipe 22 fails, the liquid phase pipeline bypass stop valve 231 will open, and the liquefied natural gas in the liquid phase pipeline 21 will pass through the liquid phase pipeline bypass vent pipe 23, the bypass converging pipe 43, the vent branch pipe 42, and then be discharged from the vent main pipe outlet end 401.

[0033] Due to the setting of the gas-phase pipeline vent pipe 32 and the gas-phase pipeline safety valve 321, once the pressure in the flash vapor connecting pipe 31 is too high, the gas-phase pipeline safety valve 321 will open, and the vaporized natural gas in the flash vapor connecting pipe 31 will be discharged and recycled through the gas-phase pipeline vent pipe 32, the vent branch pipe 42, and the outlet end 401 of the vent main pipe. Once a failure occurs in the gas-phase pipeline vent pipe 32, the gas-phase pipeline bypass stop valve 331 will open, and the vaporized cryogenic natural gas in the flash vapor connecting pipe 31 will pass through the gas-phase pipeline bypass vent pipe 33, the bypass converging pipe 43, the vent branch pipe 42, and then be discharged from the outlet end 401 of the vent main pipe. Similarly, the setting of the gas-phase pipeline bypass vent pipe 33 greatly improves the safety of the entire pipeline skid.

[0034] If the pressure in the tank is too high, the cryogenic gas in the gas phase space of the tank will pass through the vent interface of the loading arm 7, the vent connection pipe interface 411, the vent connection pipe 41, and then be discharged and recycled through the outlet end 401 of the vent main pipe.

[0035] As can be seen from the above: The present application provides a pipeline skid for connecting an LNG loading arm, which has the following advantages: First, it has a simple structure, a high degree of integration, a compact structure, low manufacturing cost, small floor area, and convenient transportation. Second, all pipelines are integrated on the support frame, so they can be prefabricated in advance, effectively saving the construction period of on-site construction, simplifying the construction process, and greatly improving the installation efficiency. Third, all pipelines are further optimized, with a simple and beautiful pipeline, which provides convenience for installation, disassembly, and later maintenance. Fourth, once the pressure in the pipeline is too high, it can be relieved through the corresponding safety valve, with good safety. Fifth, they can be assembled with each other to be suitable for loading operations of multiple cryogenic tank trucks together.

Claims

1. A pipeline skid for connecting an LNG loading arm, comprising a support frame, characterized in that: The liquid inlet main pipe, the flash gas recovery pipe and the vent main pipe are arranged in parallel on the support frame; One end of the liquid inlet main pipe is the liquid inlet end. A liquid phase pipeline is connected to the liquid inlet main pipe. The outlet end of the liquid phase pipeline is used to be connected to the liquid phase port of the loading crane pipe. A liquid phase pipeline vent pipe is arranged on the liquid phase pipeline; One end of the flash gas recovery pipe is the flash gas discharge end. The flash gas discharge end and the liquid inlet end of the liquid inlet main pipe are on the same side. A flash gas connecting pipe is connected to the flash gas recovery pipe. The input end of the flash gas connecting pipe is used to be connected to the gas phase port of the loading crane pipe. A gas phase pipeline vent pipe is arranged on the flash gas connecting pipe; One end of the vent main pipe is the vent main pipe outlet end. The vent main pipe outlet end and the liquid inlet end of the liquid inlet main pipe are on the same side. A vent connecting pipe and a vent branch pipe are connected to the vent main pipe. A number of vent connecting pipe interfaces for connecting to the vent interfaces of the loading crane pipe are arranged at the input end of the vent connecting pipe. The liquid phase pipeline vent pipe and the gas phase pipeline vent pipe are both communicated with the vent branch pipe.

2. The pipeline skid for connecting the LNG loading arm according to claim 1, wherein: A liquid phase pipeline safety valve and a liquid phase pipeline gate valve are arranged on the liquid phase pipeline vent pipe.

3. A pipeline skid for connecting an LNG loading arm, as claimed in claim 1, wherein: A gas phase pipeline safety valve and a gas phase pipeline gate valve are arranged on the gas phase pipeline vent pipe.

4. A pipeline skid for connecting an LNG loading arm, according to claim 1, characterized in that: A liquid phase pipeline bypass vent pipe is also connected to the liquid phase pipeline, and a gas phase pipeline bypass vent pipe is also connected to the flash gas connecting pipe. The liquid phase pipeline bypass vent pipe and the gas phase pipeline bypass vent pipe are both communicated with a bypass converging pipe, and the bypass converging pipe is communicated with the vent branch pipe.

5. The pipeline skid for connecting the LNG loading arm according to claim 4, characterized in that: A liquid phase pipeline bypass stop valve is arranged on the liquid phase pipeline bypass vent pipe, and a gas phase pipeline bypass stop valve is arranged on the gas phase pipeline bypass vent pipe.

6. The pipeline skid for connecting the LNG loading arm according to claim 1, wherein: A nitrogen purge pipe is also arranged on the support frame. One end of the nitrogen purge pipe is the nitrogen input end. The other end of the nitrogen purge pipe is connected with a number of nitrogen output ports for connecting to the nitrogen ports on the loading crane pipe. The nitrogen input end and the liquid inlet end of the liquid inlet main pipe are on the same side.

7. A pipeline skid for connecting an LNG loading arm, according to claim 1, characterized in that: The liquid inlet main pipe and the liquid phase pipeline are both coated with a cold insulation layer.

8. The pipeline skid for connecting the LNG loading arm according to claim 1, characterized in that: Four corner positions on the inner side of the bottom of the support frame are respectively provided with anchor connection seats for installation and connection; A number of lifting lugs for hoisting are arranged at intervals on both sides of the bottom of the support frame.

9. A pipeline skid for connecting an LNG loading arm, according to any one of claims 1 to 8, characterized in that: The other end of the liquid inlet main pipe is the liquid inlet main pipe connection end. A detachable first connection head is arranged at the liquid inlet main pipe connection end; The other end of the flash gas recovery pipe is the flash gas recovery pipe connection end. A detachable second connection head is arranged at the flash gas recovery pipe connection end; The other end of the vent main pipe is the vent main pipe connection end. A detachable third connection head is arranged at the vent main pipe connection end.

Images