Upload system for uploading natural gas

Abstract

The utility model discloses an uploading system for uploading natural gas. The uploading system comprises a CNG (Compressed Natural Gas) unloading module and a processing module, wherein the CNG gas discharging module is connected with the processing module, and the CNG gas discharging module comprises a gas discharging column, a heating decompression pry, a CNG compressor, a heat exchange pry and a molecular sieve dehydration pry; the gas discharging column, the heating and pressure reducing pry, the CNG compressor, the heat exchange pry and the molecular sieve dehydration pry are connected in sequence; the molecular sieve dehydration pry is also connected with the processing module; the processing module comprises a filter separator and a trade metering pry; two ends of the filter separator are respectively connected with the input ends of the molecular sieve dehydration pry and the trade metering pry. According to the CNG tank car, due to the design of the CNG gas discharging module, the gas discharging process of the natural gas tank car is more efficient, and the operation time and the labor cost are reduced. And through the connected treatment module, after the natural gas is subjected to molecular sieve dehydration and filtration separation, impurities and water can be effectively removed, and the quality and purity of the gas are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of LNG loading and unloading equipment, in particular to a loading system for natural gas loading. Background Art

[0002] Natural gas loading generally refers to the process of transferring natural gas from one storage or transportation container (such as a natural gas pipeline, storage tank, or LNG tanker) to another container or device. This process is crucial in the transportation and regasification of liquefied natural gas (LNG), as well as in its storage and distribution. Within the upstream and downstream processes of LNG, loading generally includes liquefaction, loading, and regasification. Natural gas loading not only involves the use of technology and equipment, but also requires compliance with certain safety and environmental standards to ensure process safety and efficiency.

[0003] In the prior art, for example, the technical solution described in patent publication number CN213118458U describes a liquefied natural gas (LNG) pressurized unloading system, comprising a loading and unloading return air arm, a loading and liquid phase arm, and an unloading boosting arm. A first pneumatic two-stage valve and a check valve are connected to the return air pipe. The loading and unloading pipe is connected in sequence to a flowmeter, a first ball valve, and a second pneumatic two-stage valve. A second ball valve is connected in parallel to both ends of the flowmeter and the first ball valve, and a third ball valve is connected in parallel to both ends of the flowmeter. An LNG main valve is connected to the loading and unloading pipe between the flowmeter and the LNG supply line, and an unloading branch pipe is connected to the loading and unloading pipe between the LNG main valve and the flowmeter.

[0004] At present, most of the equipment used for natural gas uploading adopts a decentralized layout scheme, which occupies a large area, has low space utilization and low equipment reuse rate, resulting in a certain degree of resource waste. Therefore, improving the modularization level and reuse rate of equipment is the key to solving the problem. Utility Model Content

[0005] The purpose of the present utility model is to provide an uploading system for natural gas uploading, so as to solve the problem in the prior art proposed in the background technology that the equipment used for natural gas uploading is mostly distributed, occupies a large area, has low space utilization rate and low equipment reuse rate.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A loading system for natural gas loading includes a CNG unloading module and a processing module; wherein the CNG unloading module is connected to the processing module, and the processing module processes the natural gas output from the CNG unloading module;

[0008] The CNG unloading module includes an unloading column, a heating and decompression skid, a CNG compressor, a heat exchange skid, and a molecular sieve dehydration skid. The unloading column is used to unload CNG tank trucks. The unloading column, heating and decompression skid, CNG compressor, heat exchange skid, and molecular sieve dehydration skid are connected in sequence. The molecular sieve dehydration skid is also connected to the processing module.

[0009] The processing module includes a filter separator and a trade metering skid; wherein, the two ends of the filter separator are respectively connected to the molecular sieve dehydration skid and the input end of the trade metering skid; the output end of the trade metering skid is connected to the distribution system.

[0010] According to the above technical solution, it also includes an LNG unloading module, which also includes an unloading device, a cryogenic storage tank, a tank booster, a gasification device, and an LNG compressor; wherein the unloading device, the cryogenic storage tank, the tank booster, the gasification device, and the LNG compressor are connected in sequence; the LNG compressor is then connected to the processing module, and the unloading device is used to unload the LNG tank truck.

[0011] According to the above technical solution, the LNG unloading module further includes a BOG processing unit, which is used to recover and process the BOG gas generated in the cryogenic storage tank.

[0012] According to the above technical solution, the BOG processing unit includes a BOG storage tank, a BOG vaporization device and a BOG compressor; wherein the BOG storage tank, the BOG vaporization device and the BOG compressor are connected in sequence, and the BOG storage tank is also connected to the low-temperature storage tank; the BOG compressor is connected to the processing module.

[0013] According to the above technical solution, the unloading device is also connected to the BOG storage tank to discharge the BOG gas from the LNG tank truck directly into the BOG storage tank.

[0014] According to the above technical solution, a plurality of CNG compressors are provided, and the plurality of CNG compressors are arranged between the heating and pressure reducing skid and the heat exchange skid.

[0015] According to the above technical solution, the distribution system includes a distribution station and a ball cylinder, and the ball cylinder is connected to the trade metering skid, the filter separator and the distribution station respectively.

[0016] According to the above technical solution, a valve is further provided between the ball cylinder and the distribution station.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In this utility model, the design of the CNG unloading module makes the unloading process of natural gas tank trucks more efficient, reducing operation time and labor costs. Furthermore, through the connected processing module, the natural gas undergoes molecular sieve dehydration and filtration separation, effectively removing impurities and moisture, ensuring gas quality and purity. The installation of the trade metering skid enables accurate natural gas metering, meeting trade and compliance requirements and laying the foundation for subsequent pipeline distribution. The modular design of the equipment facilitates assembly and maintenance, helping to enhance the system's flexibility and scalability, adapting to natural gas processing of varying scales and needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the equipment for loading natural gas according to the present invention.

[0020] Markings in the figure: 100-unloading column, 200-heating and pressure reducing skid, 300-CNG compressor, 400-heat exchange skid, 500-molecular sieve dehydration skid, 600-filtration separator, 700-trade metering skid, 800-unloading device, 900-cryogenic storage tank, 110-storage tank booster, 111-gasification device, 112-LNG compressor, 113-BOG storage tank, 114-BOG gasification device, 115-BOG compressor, 116-distribution station, 117-ball cylinder, 118-valve. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example 1

[0023] like Figure 1 As shown, a loading system for natural gas loading includes a CNG unloading module and a processing module; wherein the CNG unloading module is connected to the processing module, and the processing module processes the natural gas output from the CNG unloading module;

[0024] The CNG unloading module includes an unloading column 100, a heating and decompression skid 200, a CNG compressor 300, a heat exchange skid 400, and a molecular sieve dehydration skid 500. The unloading column 100 is used to unload CNG tank trucks. The unloading column 100, the heating and decompression skid 200, the CNG compressor 300, the heat exchange skid 400, and the molecular sieve dehydration skid 500 are connected in sequence. The molecular sieve dehydration skid 500 is also connected to the processing module.

[0025] The processing module includes a filter separator 600 and a trade metering skid 700; wherein, the two ends of the filter separator 600 are respectively connected to the input ends of the molecular sieve dehydration skid 500 and the trade metering skid 700; the output end of the trade metering skid 700 is connected to the distribution system, which is used to distribute the natural gas measured by the metering skid.

[0026] In this utility model, the design of the CNG unloading module makes the unloading process of natural gas tank trucks more efficient, reducing operation time and labor costs. Furthermore, through the connected processing module, the natural gas undergoes molecular sieve dehydration and filtration separation, effectively removing impurities and moisture, ensuring gas quality and purity. The installation of the trade metering skid 700 enables accurate natural gas metering, meeting trade and regulatory requirements and laying the foundation for subsequent pipeline distribution. The modular design of the equipment facilitates assembly and maintenance, helping to enhance the system's flexibility and scalability, adapting to natural gas processing of varying scales and needs.

[0027] Example 2

[0028] This embodiment is a further refinement of the first embodiment.

[0029] It also includes an LNG unloading module, which also includes an unloading device 800, a cryogenic storage tank 900, a tank booster 110, a gasification device 111, and an LNG compressor 112; wherein the unloading device 800, the cryogenic storage tank 900, the tank booster 110, the gasification device 111, and the LNG compressor 112 are connected in sequence; the LNG compressor 112 is then connected to the processing module, and the unloading device 800 is used for unloading from an LNG tank truck.

[0030] The LNG unloading module further includes a BOG processing unit, which is used to recover and process the BOG gas generated in the cryogenic storage tank 900 .

[0031] The BOG processing unit includes a BOG storage tank 113, a BOG vaporizer 114 and a BOG compressor 115; wherein the BOG storage tank 113, the BOG vaporizer 114 and the BOG compressor 115 are connected in sequence, and the BOG storage tank 113 is also connected to the low-temperature storage tank 900; the BOG compressor 115 is connected to the processing module.

[0032] The unloading device 800 is also connected to the BOG storage tank 113 and is used to discharge the BOG gas from the LNG tank truck directly into the BOG storage tank 113 .

[0033] A plurality of CNG compressors 300 are provided, and the plurality of CNG compressors 300 are disposed between the heating and pressure reducing skid 200 and the heat exchanging skid 400 .

[0034] The distribution system includes a distribution station 116 and a ball cylinder 117 . The ball cylinder 117 is connected to the trade metering skid 700 , the filter separator 600 and the distribution station 116 respectively.

[0035] Furthermore, the ball cylinder 116 is a sending and receiving ball cylinder, which is used for cleaning the pipeline after use.

[0036] A valve 118 is further provided between the ball cylinder 117 and the sub-transportation station 116 . The valve adopts an existing device, such as a ball valve, and the ball cylinder 117 and the sub-transportation station 116 are sealed by the ball valve.

[0037] The working principle of this utility model is:

[0038] CNG unloading; in the present invention, the gas source is CNG. After the gas comes from the tank truck, it is unloaded through the CNG unloading column 100 and then enters the back-end process flow. In the present invention, 6 CNG unloading columns 100 are set.

[0039] CNG heating and decompression: When a CNG tank truck initially unloads gas, the pressure is higher than the exit pressure, requiring decompression. Because the decompression process generates a temperature drop, heating is required to prevent low-temperature brittle cracking of pipeline valves and other facilities caused by the low-temperature natural gas. This utility model includes six heating and decompression skids 200, totaling six circuits.

[0040] CNG pressurization: When the unloading pressure is lower than the external transmission pressure, the CNG needs to be pressurized. The utility model is equipped with two CNG compressors 300. The CNG compressors 300 are skid-mounted, the compressors are water-cooled, and the number of compression stages is 2.

[0041] Filter separator 600: The gas from the source enters the downstream trade metering skid 700 after passing through the filter separator 600. The filter separator 600 mainly removes dust, mechanical impurities, etc. carried by the natural gas.

[0042] Molecular sieve dehydration: In order to meet the requirement of water dew point ≤ -10℃ for natural gas transmission, this utility model newly builds a molecular sieve dehydration skid with a processing capacity of 20,000Nm 3 / h, the dew point of water after treatment is ≤-17℃ (working conditions).

[0043] LNG unloading; Another gas source of the present invention is LNG. After the gas comes from the tank truck, it enters the cryogenic storage tank 900 through the hose of the unloading device 800. The present invention is equipped with two sets of unloading devices 800.

[0044] Cryogenic storage tank 900: LNG enters cryogenic storage tank 900 after unloading from the skid. This utility model adopts vertical vacuum storage tank. The total storage capacity is 50m 3 , equivalent to 30000Nm under standard conditions 3 .

[0045] LNG is pressurized and gasified; the gasification device 111 is divided into two groups, one group operates gasification and the other group defrosts. After gasification, it enters the LNG compressor 112 and is finally pressurized to 6.7~9.7MPa and enters the trade metering skid 700.

[0046] Trade metering: After being filtered and separated, the natural gas enters the trade metering skid 700 for metering and then leaves the station (i.e., enters the distribution station 116 and is discharged through the distribution station 116).

[0047] In this utility model, the gas unloading column 100, heating and decompression skid 200, CNG compressor 300, heat exchange skid 400, molecular sieve dehydration skid 500, filter separator 600, trade metering skid 700, truck unloading device 800, cryogenic storage tank 900, tank booster 110, vaporizer 111, LNG compressor 112, BOG storage tank 113, BOG vaporizer 114, BOG compressors 115 and 117 (ball cylinder), and valve 118 are all prior art, and this utility model does not involve improvements to these components. For example, vaporizer 111 utilizes an air-temperature vaporizer from Kuangji Industrial, and heating and decompression skid 200 utilizes a heating and decompression skid manufactured by Nangong Excellent Gas Equipment Co., Ltd.

[0048] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A natural gas loading system, characterized by: It includes a CNG unloading module and a processing module; wherein the CNG unloading module is connected to the processing module, and the natural gas output from the CNG unloading module is processed by the processing module; The CNG gas unloading module comprises a gas unloading column (100), a heating and decompression skid (200), a CNG compressor (300), a heat exchange skid (400), and a molecular sieve dehydration skid (500); wherein the gas unloading column (100) is used for unloading CNG tank trucks, and the gas unloading column (100), the heating and decompression skid (200), the CNG compressor (300), the heat exchange skid (400), and the molecular sieve dehydration skid (500) are connected in sequence; and the molecular sieve dehydration skid (500) is also connected to the processing module; The processing module comprises a filter separator (600) and a trade metering skid (700); wherein the two ends of the filter separator (600) are respectively connected to the molecular sieve dehydration skid (500) and the input end of the trade metering skid (700); and the output end of the trade metering skid (700) is connected to the distribution system.

2. A natural gas loading system according to claim 1, characterized in that: The loading system further comprises an LNG unloading module, which further comprises an unloading device (800), a cryogenic storage tank (900), a storage tank booster (110), a gasification device (111), and an LNG compressor (112); wherein the unloading device (800), the cryogenic storage tank (900), the storage tank booster (110), the gasification device (111), and the LNG compressor (112) are connected in sequence; the LNG compressor (112) is further connected to the processing module, and the unloading device (800) is used for unloading the LNG tank truck.

3. A natural gas loading system according to claim 2, characterized in that: The LNG unloading module further comprises a BOG processing unit, which is used to recover and process the BOG gas generated in the cryogenic storage tank (900).

4. The natural gas loading system according to claim 3, characterized in that: The BOG processing unit comprises a BOG storage tank (113), a BOG gasification device (114) and a BOG compressor (115); wherein the BOG storage tank (113), the BOG gasification device (114) and the BOG compressor (115) are connected in sequence, the BOG storage tank (113) is also connected to a low-temperature storage tank (900); and the BOG compressor (115) is connected to a processing module.

5. The natural gas loading system according to claim 4, characterized in that: The unloading device (800) is also connected to the BOG storage tank (113) and is used to discharge the BOG gas from the LNG tank truck directly into the BOG storage tank (113).

6. The natural gas loading system according to claim 1, characterized in that: A plurality of CNG compressors (300) are provided, and the plurality of CNG compressors (300) are arranged between the heating and pressure reducing skid (200) and the heat exchanging skid (400).

7. The natural gas loading system according to claim 1, characterized in that: The distribution system includes a distribution station (116) and a ball cylinder (117), and the ball cylinder (117) is connected to the trade metering skid (700), the filter separator (600) and the distribution station (116) respectively.

8. The natural gas loading system according to claim 1, characterized in that: A valve (118) is also provided between the ball cylinder (117) and the distribution station (116).

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