Skid-mounted "one island, four skids" LNG loading and unloading truck

Abstract

The present invention provides a skid-mounted "one island and four skids" LNG loading and unloading vehicle, which has a main body module, four cryogenic pipe modules and two local control cabinet modules; the main body module is provided with a liquid inlet main pipe and a gas return main pipe, a liquid phase pipeline is respectively provided between the liquid inlet main pipe and the four corners of the main module, and a gas phase pipeline is respectively provided between the gas return main pipe and the four corners of the main module; the four cryogenic pipe modules are distributed at the four corners of the main body module, each having a liquid phase branch and a gas phase branch, one end of the liquid phase branch is connected to the liquid phase pipeline, and the other end can be connected to the liquid inlet pipeline of the LNG tank truck, one end of the gas phase branch is connected to the gas return pipeline of the LNG tank truck, and the other end is connected to the gas phase pipeline; the two local control cabinet modules are each connected to the two cryogenic pipe modules by signal, and can perform local operation and flow adjustment. Such a structure is easy to operate, and can realize the loading of one to four LNG tank trucks at the same time.

Description

Technical Field

[0001] The invention relates to an LNG tank truck loading and unloading skid used in a tank truck loading unit in an LNG receiving station or a liquefaction station. Background Art

[0002] In LNG receiving stations or liquefaction stations, an LNG tanker loading and unloading package (TLP) is usually configured in the tanker loading unit.

[0003] The existing LNG tanker loading and unloading skids include: 1) skid block; 2) cryogenic crane pipe; 3) process pipelines (including liquid phase pipelines, gas phase pipelines, liquid collecting pipelines, venting pipelines, nitrogen pipelines, instrument air pipelines, etc.); 4) shut-off valves, safety valves, flow meters, regulating valves, check valves, breakaway valves, etc.; 5) local control panels; 6) electrostatic grounding systems; 7) pipeline supports and cold insulation materials, etc. These systems are relatively complex, and the manufacturers supply them in bulk, with thousands of parts, a large number of bolts, and special-shaped cold insulation materials. The on-site construction volume is huge, the construction and commissioning cycle is very long, which seriously affects the progress of the overall project, and the manufacturer is difficult to coordinate, and the on-site service costs are very high. Although some manufacturers are skid-mounted, the skid-mounting is not thorough, and the tanker loading skid is only suitable for one LNG tanker loading and unloading vehicle, without considering the development trend and direction of large-scale, integrated, and intelligent LNG receiving stations and liquefaction stations, resulting in large equipment investment, waste of factory space, and low device integration.

[0004] In the prior art, the disadvantages of LNG tanker loading and unloading skids include:

[0005] 1. The construction volume is huge and the installation period is long, which seriously affects the progress of the on-site project;

[0006] 2. There are many loose parts, and it is easy to lose or miss parts on site;

[0007] 3. It is difficult to coordinate with manufacturers and the service labor cost is high;

[0008] 4. The installation is complicated, and the requirements for installation instructors and on-site construction personnel are high;

[0009] 5. High requirements for the construction accuracy of civil foundation;

[0010] 6. Only one LNG tanker can be loaded and unloaded;

[0011] 7. Huge equipment investment and poor economic benefits;

[0012] 8. Waste factory space and cause layout tension;

[0013] 9. It cannot adapt to the development direction of large-scale and integrated equipment, and the device integration is poor. Summary of the invention

[0014] The present invention provides a new, modular, skid-mounted, intelligent LNG tanker loading and unloading package (TLP: Truck Loading & Unloading Package) system. This technology will not only greatly shorten the on-site construction, installation and commissioning time, reduce the number of construction and commissioning personnel, and save on-site equipment costs, but also adapt to the development trend and direction of large-scale, comprehensive, integrated and intelligent LNG receiving stations and liquefaction stations, improve the integration of devices, reduce equipment investment, and save factory space.

[0015] To achieve the above object, the technical solution adopted by the present invention is:

[0016] A skid-mounted "one island, four skids" LNG loading and unloading vehicle, characterized by: having a main body module, four cryogenic crane modules and two local control cabinet modules; each module can be independently skid-mounted;

[0017] The main module is provided with a liquid inlet main pipe and an air return main pipe, a liquid phase pipeline is respectively provided between the liquid inlet main pipe and the four corners of the main module, and a gas phase pipeline is respectively provided between the air return main pipe and the four corners of the main module;

[0018] The four cryogenic pipe modules are distributed at the four corners of the main module, and each cryogenic pipe module has a liquid phase branch and a gas phase branch. One end of the liquid phase branch is connected to the liquid phase pipeline, and the other end can be connected to the liquid inlet pipeline of the LNG tank truck. One end of the gas phase branch is connected to the return gas pipeline of the LNG tank truck, and the other end is connected to the gas phase pipeline.

[0019] The two local control cabinet modules are respectively connected to the two low-temperature lifting pipe modules by signal, and can perform local operation and flow regulation.

[0020] The skid-mounted "one island, four skids" LNG loading and unloading vehicle comprises: a liquid circuit cut-off valve, a flow regulating valve and a flow meter are sequentially installed on the liquid phase pipeline; and a check valve and a gas circuit cut-off valve are sequentially installed on the gas phase pipeline.

[0021] The skid-mounted "one island, four skids" LNG loading and unloading vehicle, wherein: the local control cabinet module is signal-connected to the liquid circuit cut-off valve, flow regulating valve, flow meter, check valve and gas circuit cut-off valve.

[0022] The skid-mounted "one island, four skids" LNG loading and unloading vehicle has the same structure as the gas phase branch of each cryogenic crane module, which respectively includes an inner arm, an outer arm and a rotary joint extending from a column, and a nitrogen purge pipeline and a buffer cylinder are provided between the inner arm and the outer arm; and the column is installed at the corner of the main module by bolts.

[0023] The skid-mounted "one island, four skids" LNG loading and unloading vehicle, wherein: the two local control cabinet modules are fixed to one side of the main body module in a mirror-symmetrical manner.

[0024] Compared with the prior art, the present invention has the following beneficial effects: each module can be independently skidded, which is convenient for construction and installation, and the internal modules can be removed or replaced individually during maintenance; the operator uses two local control cabinet modules to perform loading operations on site, and can realize the loading of one to four LNG tank trucks at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the structural principle of the main module;

[0027] Figure 3 It is a schematic diagram of the structure of the liquid phase pipeline;

[0028] Figure 4 It is a schematic diagram of the structure of the gas phase pipeline;

[0029] Figure 5 It is a structural schematic diagram of the cryogenic crane module;

[0030] Figure 6 It is a structural diagram of the local control cabinet module.

[0031] Explanation of the reference numerals: main module 1; liquid phase pipeline 11; gas phase pipeline 12; liquid circuit shut-off valve 13; flow regulating valve 14; flow meter 15; check valve 16; gas circuit shut-off valve 17; liquid inlet main pipe 18; gas return main pipe 19; cryogenic crane module 2; column 21; inner arm 22; nitrogen purge pipeline 23; buffer cylinder 24; outer arm 25; rotary joint 26; liquid phase branch 27; gas phase branch 28; local control cabinet module 3; box body 31; display screen 32; button 33. DETAILED DESCRIPTION

[0032] The present invention combines the process pipelines (including liquid phase pipelines, gas phase pipelines, liquid collecting pipelines, venting pipelines, nitrogen pipelines, instrument air pipelines, etc.) in the traditional four tank truck skids, local control panels, electrostatic grounding systems, pipeline supports and cold insulation materials, and arranges them in an island after optimized design and comprehensive integration, forming a "one island four skids" loading and unloading technology, which can load and unload four LNG tank trucks at the same time.

[0033] like Figure 1As shown, the present invention is based on the "one island four skids" tank truck loading skid system composition. Through installation functionalization, skid mounting and independence considerations, the "one island four skids" tank truck loading skid system is divided into seven modules; namely: a main module 1, four cryogenic crane modules 2 and two local control cabinet modules 3; the above modules can be independently skided, which is convenient for construction and installation, and the internal modules can be removed or replaced separately during maintenance.

[0034] The main module 1 mainly includes pipelines, instruments and valves that can realize the tank truck loading function, such as Figure 2 As shown, a liquid inlet main pipe 18 and a gas return main pipe 19 are provided in the center thereof, a liquid phase pipeline 11 is provided between the liquid inlet main pipe 18 and each corner of the main module 1, and a gas phase pipeline 12 is provided between the gas return main pipe 19 and each corner of the main module 1;

[0035] The liquid phase pipeline 11 has a structure as follows Figure 3 As shown, one end thereof is connected to the liquid inlet main pipe 18, and a liquid circuit cut-off valve 13, a flow regulating valve 14 and a flow meter 15 are installed in sequence, and the other end is connected to the corner of the main module 1;

[0036] The gas phase pipeline 12 has a structure as follows Figure 4 As shown, one end thereof is connected to the corner of the main module 1, and a check valve 16 and an air circuit cut-off valve 17 are installed in sequence, and the other end thereof is connected to the return air main pipe 19;

[0037] In addition, the main module 1 should also have a cold circulation pipeline and functions such as LNG pressure relief and exhaust. These structures and functions are conventional structures and functions in the field and will not be described in detail here.

[0038] The four cryogenic pipe modules 2 are distributed at the four corners of the main module 1, and each cryogenic pipe module 2 can be connected to an LNG tanker. Figure 5 As shown, each cryogenic pipe module 2 is divided into an upper and lower branch, wherein the upper branch is a liquid phase branch 27 for connecting the liquid phase pipeline 11 with the liquid inlet pipeline of the LNG tank truck, and the lower branch is a gas phase branch 28 for connecting the gas phase pipeline 12 with the gas return pipeline of the LNG tank truck;

[0039] The structures of the upper road and the lower road are basically the same, respectively including an inner arm 22, an outer arm 25 and a rotary joint 26 extending from a column 21, and a nitrogen purge pipeline 23 and a buffer cylinder 24 are provided between the inner arm 22 and the outer arm 25; and the column 21 is installed at the corner of the main module 1 by bolts;

[0040] The two local control cabinet modules 3 can be connected to the main module 1 by bolts and fixed to one side of the main module 1 in a mirror-symmetrical manner, and are respectively used to control the local operation and related flow regulation of the two cryogenic crane modules 2. Figure 4 As shown, each local control cabinet module 3 has a box body 31, on which a display screen 32 and buttons 33 are provided. The control system in the box body 31 is connected to all the instruments in the main module 1 (such as the liquid circuit shut-off valve 13, the flow regulating valve 14, the flow meter 15, the check valve 16 and the gas circuit shut-off valve 17, etc.) through the terminal block through the instrument bridge and instrument cable inside the main module 1, and can receive the pressure, flow, temperature and other signals on site, and display them on the display screen 32, so that the tank truck loading status of the entire system can be clearly seen; and the button 33 can realize manual / automatic control of the tank truck loading process.

[0041] LNG is connected to the liquid inlet main pipe 18 of the main module 1 through the loading main pipeline. After entering the main module 1, the flow and pressure are adjusted, and then connected to the four LNG tank trucks arranged at the four corners of the main module 1 through four liquid pipelines 11 and four cryogenic crane modules 2. The NG generated by the LNG tank truck during the loading process is converged to the return gas main pipe 19 through the cryogenic crane module 2 and the gas phase pipeline 12, and then sent to the gas phase return main pipe; in this way, the operator uses two on-site control cabinet modules 3 to perform loading operations on site, and can realize the loading of one to four LNG tank trucks.

[0042] The above description is only illustrative rather than restrictive of the present invention. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the claims, but all will fall within the scope of protection of the present invention.

Claims

1. A skid-mounted "one island, four skids" LNG loading and unloading vehicle, characterized by: It has a main module, four cryogenic crane modules and two local control cabinet modules; each module can be independently skidded; The main module is provided with a liquid inlet main pipe and an air return main pipe, a liquid phase pipeline is respectively provided between the liquid inlet main pipe and the four corners of the main module, and a gas phase pipeline is respectively provided between the air return main pipe and the four corners of the main module; The four cryogenic pipe modules are distributed at the four corners of the main module, and each cryogenic pipe module has a liquid phase branch and a gas phase branch. One end of the liquid phase branch is connected to the liquid phase pipeline, and the other end can be connected to the liquid inlet pipeline of the LNG tank truck. One end of the gas phase branch is connected to the return gas pipeline of the LNG tank truck, and the other end is connected to the gas phase pipeline. The liquid phase branch and the gas phase branch of each cryogenic pipe module have the same structure, and respectively include an inner arm, an outer arm and a rotary joint extending from a column, and a nitrogen purge pipeline and a buffer cylinder are provided between the inner arm and the outer arm; and the column is installed at the corner of the main module; The two local control cabinet modules are respectively connected to the two low-temperature lifting pipe modules by signal, and can perform local operation and flow regulation.

2. The skid-mounted "one island four skids" LNG loading and unloading vehicle according to claim 1 is characterized by: The liquid phase pipeline is sequentially installed with a liquid circuit cut-off valve, a flow regulating valve and a flow meter; the gas phase pipeline is sequentially installed with a check valve and a gas circuit cut-off valve.

3. The skid-mounted "one island four skids" LNG loading and unloading vehicle according to claim 2 is characterized by: The local control cabinet module is signal-connected to the liquid circuit cut-off valve, the flow regulating valve, the flow meter, the check valve and the gas circuit cut-off valve.

4. The skid-mounted "one island four skids" LNG loading and unloading vehicle according to claim 1 is characterized in that: The two local control cabinet modules are fixed on one side of the main body module in a mirror-symmetrical manner.

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