Supply system of liquefied natural gas receiving station

Abstract

The utility model provides a supply system of a liquefied natural gas receiving station, which relates to a natural gas receiving station and comprises an LNG (liquefied natural gas) storage device, a gasification device, a BOG (boil-off gas) supercharging device, a mixing device, a high-pressure pump and a processor, a low-pressure pump is arranged on the inner wall of the LNG storage equipment; the low-pressure pump, the gasification equipment, the mixing equipment, the high-pressure pump and the output pipe network are sequentially connected through conveying pipes; the LNG storage equipment, the BOG supercharging equipment and the mixing equipment are sequentially connected through a conveying pipe; flow detection equipment is arranged on the conveying pipe for communicating the gasification equipment with the mixing equipment and is used for detecting the flow of the gasified natural gas; flow adjusting equipment is arranged on a conveying pipe for communicating the BOG supercharging equipment with the mixing equipment and is used for adjusting the flow of the evaporated gas; the flow detection equipment and the flow regulation equipment are connected with the processor; the processor is used for controlling the flow adjusting device according to the gasified natural gas flow detected by the flow detecting device. And the stability of the mixed gas is improved.

Description

Technical Field

[0001] The utility model relates to a natural gas receiving station, in particular to a supply system of a liquefied natural gas receiving station. Background Art

[0002] During the storage and transportation of liquefied natural gas (LNG), due to temperature changes, part of the liquefied natural gas (LNG) will evaporate into BOG gas (mainly composed of methane). In order to reduce the amount of BOG directly discharged into the atmosphere, the treated BOG gas is usually mixed with natural gas; although the composition of BOG gas is similar to that of natural gas, BOG gas may contain higher levels of non-hydrocarbon gases such as nitrogen and carbon dioxide; currently, when mixing BOG gas and natural gas, the mixing conditions are uncertain, resulting in large differences in the properties of the mixed gas. The mixed natural gas is transported to the external transmission pipeline network, and then sent to the user through the external transmission pipeline network for use. When burning, due to the difference in gas properties, unstable combustion is prone to occur. Utility Model Content

[0003] The utility model aims to provide a supply system for a liquefied natural gas receiving station, and the technical problem to be solved is to improve the stabilizing effect of gas performance after BOG gas and natural gas are mixed.

[0004] The utility model is realized by the following technical solutions:

[0005] A supply system for a liquefied natural gas receiving station, comprising:

[0006] LNG storage equipment, used to store liquefied natural gas;

[0007] A low-pressure pump is arranged in the above-mentioned LNG storage equipment;

[0008] Gasification equipment, wherein the input end of the gasification equipment is connected to the output end of the low-pressure pump through a first delivery pipe;

[0009] BOG boosting equipment, wherein the input end of the BOG boosting equipment is connected to the output end of the LNG storage equipment through a second delivery pipe; the second delivery pipe is arranged on the top of the LNG storage equipment, and the second delivery pipe is used to deliver the boil-off gas in the LNG storage equipment to the BOG boosting equipment;

[0010] A mixing device, wherein one input end of the mixing device is connected to the output end of the gasification device through a third delivery pipe, and another input end of the mixing device is connected to the output end of the BOG boosting device through a fourth delivery pipe;

[0011] A high-pressure pump, wherein the input end of the high-pressure pump is connected to the output end of the mixing device via a fifth delivery pipe, and the output end of the high-pressure pump is connected to an external delivery pipeline network;

[0012] The third delivery pipe is provided with a flow detection device, and the flow detection device is used to detect the flow of gasified natural gas entering the mixing device;

[0013] The fourth delivery pipe is provided with a flow regulating device, and the flow regulating device is used to regulate the flow of the evaporated gas entering the mixing device;

[0014] The processor is connected to the flow detection device and the flow regulation device; the processor is used to control the flow regulation device according to the gasified natural gas flow detected by the flow detection device.

[0015] The supply system is provided with a flow detection device and a flow regulation device connected to the processor. The flow detection device can monitor the flow of gasified natural gas entering the mixing device in real time, and the processor controls the flow regulation device according to these real-time data, thereby regulating the flow of evaporated gas entering the mixing device. This closed-loop control system can ensure that the conditions in the mixing process (such as flow ratio) are strictly controlled to achieve a stable mixing effect.

[0016] Due to the involvement of the processor, this supply system has higher operational flexibility and automation; the processor can adjust the mixing ratio in real time according to actual needs and conditions, which improves the adaptability and reliability of the system. In addition, automated flow control and monitoring also reduce the error rate of manual operation and improve overall safety.

[0017] Through the above measures, the supply system can produce a more stable and high-quality mixed gas, which not only improves the overall performance of the supply system, but also helps ensure that downstream users receive a more reliable and efficient natural gas supply.

[0018] Furthermore, the third delivery pipe is also provided with a first pressure detection device, and the first pressure detection device is used to detect the pressure of the gasified natural gas entering the mixing device;

[0019] The first pressure detection device is connected to a processor, and the processor is used to determine the boil-off gas flow rate of the flow regulating device according to the detected gasified natural gas flow rate and gasified natural gas pressure, and control the flow regulating device.

[0020] On the basis of the original flow detection, the first pressure detection device is added, so that the processor can simultaneously obtain the flow and pressure data of the gasified natural gas; after receiving the flow and pressure data of the gasified natural gas, the processor can more accurately judge the mixing conditions and adjust the flow regulating device accordingly to ensure the stability and quality of the mixed gas. This dual-parameter control method is more accurate and reliable than simple flow control.

[0021] Since the mixing conditions can be monitored and adjusted in real time, the supply system can maintain good performance under different working environments and conditions, and can also avoid potential safety hazards caused by improper mixing conditions; for example, when the flow rate or pressure of gasified natural gas changes, the system can respond quickly and adjust the flow rate of evaporated gas to maintain the stability of the mixed gas;

[0022] By precisely controlling the mixing conditions, the quality and performance of the mixed gas can be ensured to be optimal, thereby maximizing the utilization of energy, which not only helps to reduce energy waste, but also helps to improve the economic benefits of the supply system.

[0023] Furthermore, the fourth delivery pipe is also provided with a pressure regulating device, and the pressure regulating device is used to regulate the pressure of the evaporation gas entering the mixing device;

[0024] The pressure regulating device is connected to a processor, which is used to determine the evaporation gas flow of the flow regulating device and the evaporation gas pressure of the pressure regulating device according to the detected gasified natural gas flow and gasified natural gas pressure, and to control the flow regulating device and the pressure regulating device.

[0025] There may be a difference in pressure between boil-off gas (BOG) and vaporized natural gas before mixing. By introducing a pressure regulating device, the pressure of the boil-off gas entering the mixing device is ensured to match the pressure of the vaporized natural gas, thereby avoiding problems such as uneven mixing or unstable performance due to pressure differences.

[0026] Furthermore, the pressure regulating device is arranged between the BOG boosting device and the flow regulating device.

[0027] Ensure that the pressure of the evaporator gas is adjusted before adjusting the evaporator gas flow rate, and adjust the pressure immediately after the boost, so as to improve the control accuracy of the evaporator gas pressure, and help reduce the risk of unstable mixed gas performance due to excessively high or low pressure; ensure that the evaporator gas entering the flow regulating device has a stable pressure, which helps to reduce the wear of the flow regulating device due to pressure fluctuations and extend its service life.

[0028] Furthermore, a second pressure detection device is provided on the fourth delivery pipe between the pressure regulating device and the flow regulating device, and the second pressure detection device is used to detect the pressure of the evaporation gas after pressure regulation;

[0029] The second pressure detection device is connected to the processor;

[0030] The above-mentioned processor is used to determine the evaporation gas pressure of the pressure regulating device according to the detected evaporation gas flow and evaporation gas pressure, and control the pressure regulating device to perform pressure regulation. After the pressure regulation, the evaporation gas flow of the flow regulating device is determined according to the detected evaporation gas pressure, evaporation gas flow and evaporation gas pressure, and the flow regulating device is controlled.

[0031] The second pressure detection device mentioned above is used to monitor the evaporation gas pressure after the pressure regulating device to accurately judge the working effect of the pressure regulating device and timely discover potential pressure problems. After the pressure is adjusted, the processor will adjust the flow regulation strategy based on real-time data to ensure that the mixing process is always carried out under the best conditions, thereby obtaining the most stable and high-quality mixed gas.

[0032] By monitoring the pressure of the evaporated gas in real time, the system can take timely measures when the pressure is too high or too low to prevent potential safety issues such as leakage or equipment damage, helping to ensure the safe operation of the supply system.

[0033] Furthermore, the third delivery pipe is also provided with a first temperature detection device, and the first temperature detection device is used to detect the temperature of the gasified natural gas entering the mixing device;

[0034] The first temperature detection device is connected to a processor, which is used to determine the evaporation gas flow of the flow regulating device and the evaporation gas pressure of the pressure regulating device according to the detected evaporation natural gas flow, evaporation natural gas pressure and evaporation natural gas temperature, and to control the flow regulating device and the pressure regulating device.

[0035] In addition to flow and pressure, temperature is also an important factor affecting the quality of mixed gas. By introducing the first temperature detection device, the system can now fully monitor the three key parameters of gasified natural gas flow, pressure and temperature, providing richer data support for the processor; after receiving the flow, pressure and temperature data of gasified natural gas, the processor can use more complex algorithms and models to more accurately determine the setting parameters of the flow regulating device and the pressure regulating device, which helps to ensure that the mixing process is carried out under the best conditions and obtain the most stable and high-quality mixed gas;

[0036] By comprehensively considering the three parameters of flow, pressure and temperature, energy can be used more efficiently and unnecessary waste can be reduced.

[0037] Furthermore, the fourth delivery pipe is also provided with a temperature regulating device, and the temperature regulating device is used to regulate the temperature of the evaporated gas entering the mixing device;

[0038] The temperature regulating device is connected to a processor, which is used to determine the evaporation gas flow of the flow regulating device, the evaporation gas pressure of the pressure regulating device and the evaporation gas temperature of the temperature regulating device according to the detected evaporation natural gas flow, evaporation natural gas pressure and evaporation natural gas temperature, and to control the flow regulating device, the pressure regulating device and the temperature regulating device.

[0039] A temperature regulating device is added to the supply system to regulate the temperature of the evaporating gas entering the mixing device to ensure that it matches the temperature of the gasified natural gas, thereby obtaining a more uniform and stable mixed gas.

[0040] When the above-mentioned flow regulating devices, pressure regulating devices and temperature regulating devices are all connected to and controlled by the processor, the system can achieve comprehensive control optimization; the processor can comprehensively determine the optimal flow, pressure and temperature settings based on real-time flow, pressure and temperature data to ensure that the quality and performance of the mixed gas reach the optimal state.

[0041] In summary, introducing a temperature regulating device and connecting it to a processor can further enhance the control accuracy and performance stability of the supply system.

[0042] Furthermore, the temperature regulating device is arranged between the second pressure detecting device and the flow regulating device.

[0043] Placing the temperature regulating device after the second pressure detecting device allows the system to take the adjusted pressure into account when adjusting the temperature. Since the entire process is completed in a closed environment, when the pressure regulating device does not reach the preset pressure, the evaporated gas pressure can be compensated by temperature regulation, thereby synergistically controlling the temperature and pressure of the evaporated gas, so that the evaporated gas entering the flow regulating device has a more stable state.

[0044] Adjusting the temperature based on the pressure helps ensure better compatibility and uniformity of the evaporation gas and the vaporized natural gas during the mixing process, avoiding problems such as uneven mixing or performance degradation caused by temperature and pressure mismatch.

[0045] Furthermore, a second temperature detection device is provided on the fourth delivery pipe between the temperature regulating device and the flow regulating device, and the second temperature detection device is used to detect the temperature of the evaporating gas after temperature regulation;

[0046] The second temperature detection device is connected to the processor;

[0047] The above-mentioned processor is used to determine the evaporation gas temperature of the temperature regulating device according to the detected evaporation gas pressure, vaporized natural gas flow rate and vaporized natural gas pressure, and control the temperature regulating device to perform temperature regulation. After the temperature regulation, the evaporation gas flow rate of the flow regulating device is determined according to the detected evaporation gas temperature, vaporized natural gas flow rate and vaporized natural gas pressure, and the flow regulating device is controlled.

[0048] The second temperature detection device is introduced to monitor the temperature of the evaporating gas after temperature adjustment, thereby further improving the precise control and performance stability of the system.

[0049] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0050] The supply system is provided with a flow detection device and a flow regulation device connected to the processor. The flow detection device can monitor the flow of gasified natural gas entering the mixing device in real time, and the processor controls the flow regulation device according to these real-time data, thereby regulating the flow of evaporated gas entering the mixing device. This closed-loop control system can ensure that the conditions in the mixing process (such as flow ratio) are strictly controlled to achieve a stable mixing effect.

[0051] Due to the involvement of the processor, this supply system has higher operational flexibility and automation; the processor can adjust the mixing ratio in real time according to actual needs and conditions, which improves the adaptability and reliability of the system. In addition, automated flow control and monitoring also reduce the error rate of manual operation and improve overall safety.

[0052] Through the above measures, the supply system can produce a more stable and high-quality mixed gas, which not only improves the overall performance of the supply system, but also helps ensure that downstream users receive a more reliable and efficient natural gas supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0054] Figure 1 This is the connection diagram of the supply system.

[0055] Marks and corresponding parts names in the attached drawings:

[0056] 10. LNG storage equipment; 20. Low-pressure pump; 30. Gasification equipment; 40. BOG boosting equipment; 50. Mixing equipment; 60. High-pressure pump; 70. External transmission pipeline network; 80. Pressure regulating equipment; 81. Temperature regulating equipment; 82. Flow regulating equipment; 83. First pressure detection equipment; 84. First temperature detection equipment; 85. Flow detection equipment; 86. Second pressure detection equipment; 87. Second temperature detection equipment; 91. First delivery pipe; 92. Second delivery pipe; 93. Third delivery pipe; 94. Fourth delivery pipe; 95. Fifth delivery pipe. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0058] In conventional supply systems, boil-off gas and gasified natural gas are often mixed directly without considering the differences in their components. Such mixing may cause fluctuations and instability in gas properties. Figure 1 Through special regulating and detecting equipment, the pressure and temperature of the boil-off gas are first processed to match the pressure and temperature of the vaporized natural gas, and then the mixing ratio of the incoming boil-off gas and the vaporized natural gas is controlled to reduce the problem of unstable performance of the mixed gas due to component differences.

[0059] Example 1

[0060] This embodiment 1 provides a supply system for a liquefied natural gas receiving station, including:

[0061] LNG storage equipment 10 (LNG storage tanks may be used) for storing liquefied natural gas;

[0062] A low-pressure pump 20 (a submersible pump may be used) is disposed in the LNG storage device 10;

[0063] Gasification equipment 30 (a gasifier may be used), the input end of the gasification equipment 30 is connected to the output end of the low-pressure pump 20 through a first delivery pipe 91;

[0064] The BOG boosting device 40 (a vertical labyrinth reciprocating compressor and a horizontal opposed balanced oil-free lubricated reciprocating compressor may be used), the input end of the BOG boosting device 40 is connected to the output end of the LNG storage device 10 through a second delivery pipe 92; the second delivery pipe 92 is arranged on the top of the LNG storage device 10, and the second delivery pipe 92 is used to deliver the boil-off gas in the LNG storage device 10 to the BOG boosting device 40;

[0065] A mixing device 50 (a three-way valve may be used), one input end of the mixing device 50 is connected to the output end of the gasification device 30 via a third delivery pipe 93, and the other input end of the mixing device 50 is connected to the output end of the BOG boosting device 40 via a fourth delivery pipe 94;

[0066] A high-pressure pump 60 (a vertical centrifugal pump may be used), wherein the input end of the high-pressure pump 60 is connected to the output end of the mixing device 50 via a fifth delivery pipe 95, and the output end of the high-pressure pump 60 is connected to an external delivery pipe network 70;

[0067] The third delivery pipe 93 is provided with a flow detection device 85 (an air flow sensor may be used), and the flow detection device 85 is used to detect the flow of gasified natural gas entering the mixing device 50;

[0068] The fourth delivery pipe 94 is provided with a flow regulating device 82 (a flow regulating valve may be used), and the flow regulating device 82 is used to regulate the flow of the evaporated gas entering the mixing device 50;

[0069] The processor (which may be a single chip microcomputer, PLC, etc.) is connected to the flow detection device 85 and the flow regulation device 82 ; the processor uses an existing program for processing: it is used to control the flow regulation device 82 according to the gasified natural gas flow detected by the flow detection device 85 .

[0070] The supply system is provided with a flow detection device 85 and a flow regulation device 82 connected to the processor. The flow detection device 85 can monitor the flow of gasified natural gas entering the mixing device 50 in real time, and the processor controls the flow regulation device 82 according to these real-time data, thereby regulating the flow of evaporated gas entering the mixing device 50; this closed-loop control system can ensure that the conditions in the mixing process (such as flow ratio) are strictly controlled to achieve a stable mixing effect.

[0071] Due to the involvement of the processor, this supply system has higher operational flexibility and automation; the processor can adjust the mixing ratio in real time according to actual needs and conditions, which improves the adaptability and reliability of the system. In addition, automated flow control and monitoring also reduce the error rate of manual operation and improve overall safety.

[0072] Through the above measures, the supply system can produce a more stable and high-quality mixed gas, which not only improves the overall performance of the supply system, but also helps ensure that downstream users receive a more reliable and efficient natural gas supply.

[0073] Example 2

[0074] On the basis of Example 1, the third delivery pipe 93 is further provided with a first pressure detection device 83 (a pressure sensor may be used), and the first pressure detection device 83 is used to detect the pressure of the gasified natural gas entering the mixing device 50;

[0075] The first pressure detection device 83 is connected to a processor, and the processor uses an existing program to perform processing: it is used to determine the evaporation gas flow rate of the flow regulating device 82 according to the detected gasified natural gas flow rate and gasified natural gas pressure, and control the flow regulating device 82.

[0076] On the basis of the original flow detection, the first pressure detection device 83 is added, so that the processor can simultaneously obtain the flow and pressure data of the gasified natural gas; after receiving the flow and pressure data of the gasified natural gas, the processor can more accurately judge the mixing conditions and adjust the flow regulating device 82 accordingly to ensure the stability and quality of the mixed gas. This dual-parameter control method is more accurate and reliable than simple flow control.

[0077] Since the mixing conditions can be monitored and adjusted in real time, the supply system can maintain good performance under different working environments and conditions, and can also avoid potential safety hazards caused by improper mixing conditions; for example, when the flow rate or pressure of gasified natural gas changes, the system can respond quickly and adjust the flow rate of evaporated gas to maintain the stability of the mixed gas;

[0078] By precisely controlling the mixing conditions, the quality and performance of the mixed gas can be ensured to be optimal, thereby maximizing the utilization of energy, which not only helps to reduce energy waste, but also helps to improve the economic benefits of the supply system.

[0079] In addition, through the processing and analysis of data by the processor, some potential problems can be predicted and prevented, thereby improving the overall reliability of the system.

[0080] In a specific embodiment, a pressure regulating device 80 (a pressure regulating valve may be used) is further provided on the fourth delivery pipe 94, and the pressure regulating device 80 is used to regulate the pressure of the evaporated gas entering the mixing device 50;

[0081] The pressure regulating device 80 is connected to a processor, which uses an existing program for processing: it is used to determine the evaporation gas flow rate of the flow regulating device 82 and the evaporation gas pressure of the pressure regulating device 80 according to the detected gasified natural gas flow rate and gasified natural gas pressure, and control the flow regulating device 82 and the pressure regulating device 80.

[0082] Before mixing, boil-off gas (BOG) and gasified natural gas may have different pressures. By introducing the pressure regulating device 80, the boil-off gas pressure entering the mixing device 50 is ensured to match the gasified natural gas pressure, thereby avoiding problems of uneven mixing or unstable performance due to pressure differences.

[0083] In a specific embodiment, the pressure regulating device 80 is disposed between the BOG boosting device 40 and the flow regulating device 82 .

[0084] Ensure that the pressure of the evaporated gas is adjusted before adjusting the flow rate, and perform pressure regulation immediately after pressurization to improve the control accuracy of the evaporated gas pressure, which helps to reduce the risk of unstable mixed gas performance due to excessively high or low pressure; ensure that the evaporated gas entering the flow regulating device 82 has a stable pressure, which helps to reduce the wear of the flow regulating device 82 due to pressure fluctuations and extend its service life.

[0085] Example 3

[0086] On the basis of Example 2, a second pressure detection device 86 (a pressure sensor may be used) is provided on the fourth delivery pipe 94 between the pressure regulating device 80 and the flow regulating device 82, and the second pressure detection device 86 is used to detect the pressure of the evaporation gas after pressure regulation;

[0087] The second pressure detection device 86 is connected to the processor;

[0088] The above-mentioned processor adopts the existing program for processing: it is used to determine the evaporation gas pressure of the pressure regulating device 80 according to the detected evaporation gas flow rate and the evaporation gas pressure, and control the pressure regulating device 80 to perform pressure regulation. After the pressure regulation, the evaporation gas flow rate of the flow regulating device 82 is determined according to the detected evaporation gas pressure, the evaporation gas flow rate and the evaporation gas pressure, and the flow regulating device 82 is controlled.

[0089] The second pressure detection device 86 is used to monitor the evaporation gas pressure after the pressure regulating device 80 to accurately determine the working effect of the pressure regulating device 80 and promptly discover potential pressure problems. After the pressure is adjusted, the processor will adjust the flow regulation strategy based on real-time data to ensure that the mixing process is always carried out under optimal conditions, thereby obtaining the most stable and high-quality mixed gas.

[0090] By monitoring the pressure of the evaporated gas in real time, the system can take timely measures when the pressure is too high or too low to prevent potential safety issues such as leakage or equipment damage, helping to ensure the safe operation of the supply system.

[0091] The processor may also use existing programs to control the pressure regulating device 80 according to the data provided by the second pressure detecting device 86 to ensure that its output has a constant and appropriate pressure, which helps to eliminate the risk of unstable mixed gas performance due to pressure fluctuations.

[0092] Example 4

[0093] On the basis of any of the above embodiments, the third delivery pipe 93 is further provided with a first temperature detection device 84 (a temperature sensor may be used), and the first temperature detection device 84 is used to detect the temperature of the gasified natural gas entering the mixing device 50;

[0094] The first temperature detection device 84 is connected to a processor, which uses an existing program for processing: it is used to determine the evaporation gas flow rate of the flow regulating device 82 and the evaporation gas pressure of the pressure regulating device 80 according to the detected gasified natural gas flow rate, gasified natural gas pressure and gasified natural gas temperature, and to control the flow regulating device 82 and the pressure regulating device 80.

[0095] In addition to flow rate and pressure, temperature is also an important factor affecting the quality of the mixed gas. By introducing the first temperature detection device 84, the system can now fully monitor the three key parameters of the gasified natural gas flow rate, pressure and temperature, providing more abundant data support for the processor; after receiving the gasified natural gas flow rate, pressure and temperature data, the processor can use more complex algorithms and models to more accurately determine the setting parameters of the flow regulating device 82 and the pressure regulating device 80, which helps to ensure that the mixing process is carried out under the best conditions and obtain the most stable and high-quality mixed gas;

[0096] By comprehensively considering the three parameters of flow, pressure and temperature, energy can be used more efficiently and unnecessary waste can be reduced.

[0097] In a specific embodiment, a temperature regulating device 81 (a temperature controller may be used) is further provided on the fourth delivery pipe 94, and the temperature regulating device 81 is used to regulate the temperature of the evaporated gas entering the mixing device 50;

[0098] The temperature regulating device 81 is connected to a processor, and the processor uses an existing program for processing: it is used to determine the evaporation gas flow rate of the flow regulating device 82, the evaporation gas pressure of the pressure regulating device 80 and the evaporation gas temperature of the temperature regulating device 81 according to the detected evaporation natural gas flow rate, evaporation natural gas pressure and evaporation natural gas temperature, and control the flow regulating device 82, the pressure regulating device 80 and the temperature regulating device 81.

[0099] A temperature regulating device 81 is added to the supply system to regulate the temperature of the evaporation gas entering the mixing device 50 to ensure that it matches the temperature of the gasified natural gas, thereby obtaining a more uniform and stable mixed gas.

[0100] When the above-mentioned flow regulating device 82, pressure regulating device 80 and temperature regulating device 81 are all connected to and controlled by the processor, the system can achieve comprehensive control optimization; the processor can comprehensively determine the optimal flow, pressure and temperature settings based on real-time flow, pressure and temperature data to ensure that the quality and performance of the mixed gas reach the optimal state.

[0101] In summary, introducing the temperature regulating device 81 and connecting it to the processor can further enhance the control accuracy and performance stability of the supply system.

[0102] In a specific embodiment, the temperature regulating device 81 is disposed between the second pressure detecting device 86 and the flow regulating device 82 .

[0103] Placing the temperature regulating device 81 after the second pressure detecting device 86 allows the system to take the adjusted pressure into account when adjusting the temperature. Since the entire process is completed in a closed environment, when the pressure regulating device 80 does not reach the preset pressure, the evaporated gas pressure can be compensated by temperature regulation, thereby synergistically controlling the temperature and pressure of the evaporated gas, so that the evaporated gas entering the flow regulating device 82 has a more stable state.

[0104] Adjusting the temperature based on the pressure helps ensure better compatibility and uniformity of the evaporation gas and the vaporized natural gas during the mixing process, avoiding problems such as uneven mixing or performance degradation caused by temperature and pressure mismatch.

[0105] In a specific embodiment, a second temperature detection device 87 (a temperature sensor may be used) is provided on the fourth delivery pipe 94 between the temperature adjustment device 81 and the flow adjustment device 82. The second temperature detection device 87 is used to detect the temperature of the evaporation gas after temperature adjustment.

[0106] The second temperature detection device 87 is connected to the processor;

[0107] The above-mentioned processor adopts the existing program for processing: it is used to determine the evaporation gas temperature of the temperature regulating device 81 according to the detected evaporation gas pressure, gasified natural gas flow rate and gasified natural gas pressure, and control the temperature regulating device 81 to perform temperature regulation; after the temperature regulation, it is used to determine the evaporation gas flow rate of the flow regulating device 82 according to the detected evaporation gas temperature, gasified natural gas flow rate and gasified natural gas pressure, and control the flow regulating device 82.

[0108] The second temperature detection device 87 is introduced to monitor the temperature of the evaporation gas after temperature adjustment, thereby further improving the precise control and performance stability of the system.

[0109] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A supply system for a liquefied natural gas receiving station, characterized in that: include: LNG storage equipment (10) for storing liquefied natural gas; A low-pressure pump (20) is disposed in the LNG storage device (10); A gasification device (30), wherein an input end of the gasification device (30) is connected to an output end of the low-pressure pump (20) via a first delivery pipe (91); A BOG boosting device (40), wherein an input end of the BOG boosting device (40) is connected to an output end of the LNG storage device (10) via a second delivery pipe (92); the second delivery pipe (92) is arranged on the top of the LNG storage device (10), and the second delivery pipe (92) is used to deliver boil-off gas in the LNG storage device (10) to the BOG boosting device (40); A mixing device (50), wherein one input end of the mixing device (50) is connected to the output end of the gasification device (30) via a third delivery pipe (93), and the other input end of the mixing device (50) is connected to the output end of the BOG boosting device (40) via a fourth delivery pipe (94); A high-pressure pump (60), wherein an input end of the high-pressure pump (60) is connected to an output end of the mixing device (50) via a fifth delivery pipe (95), and an output end of the high-pressure pump (60) is connected to an external delivery pipeline network (70); The third delivery pipe (93) is provided with a flow detection device (85), and the flow detection device (85) is used to detect the flow of gasified natural gas entering the mixing device (50); The fourth delivery pipe (94) is provided with a flow regulating device (82), and the flow regulating device (82) is used to regulate the flow of evaporated gas entering the mixing device (50); A processor is connected to the flow detection device (85) and the flow regulation device (82); the processor is used to control the flow regulation device (82) according to the gasified natural gas flow detected by the flow detection device (85).

2. A supply system for a liquefied natural gas receiving station according to claim 1, characterized in that: The third delivery pipe (93) is also provided with a first pressure detection device (83), and the first pressure detection device (83) is used to detect the pressure of the gasified natural gas entering the mixing device (50); The first pressure detection device (83) is connected to a processor, and the processor is used to determine the boil-off gas flow rate of the flow regulating device (82) according to the detected gasified natural gas flow rate and gasified natural gas pressure, and to control the flow regulating device (82).

3. A supply system for a liquefied natural gas receiving station according to claim 2, characterized in that: The fourth delivery pipe (94) is also provided with a pressure regulating device (80), and the pressure regulating device (80) is used to regulate the pressure of the evaporated gas entering the mixing device (50); The pressure regulating device (80) is connected to a processor, and the processor is used to determine the boil-off gas flow rate of the flow regulating device (82) and the boil-off gas pressure of the pressure regulating device (80) according to the detected boil-off natural gas flow rate and boil-off natural gas pressure, and to control the flow regulating device (82) and the pressure regulating device (80).

4. A supply system for a liquefied natural gas receiving station according to claim 3, characterized in that: The pressure regulating device (80) is arranged between the BOG boosting device (40) and the flow regulating device (82).

5. A supply system for a liquefied natural gas receiving station according to claim 4, characterized in that: A second pressure detection device (86) is provided on the fourth delivery pipe (94) between the pressure regulating device (80) and the flow regulating device (82), and the second pressure detection device (86) is used to detect the pressure of the evaporation gas after pressure regulation; The second pressure detection device (86) is connected to the processor; The processor is used to determine the boil-off gas pressure of the pressure regulating device (80) according to the detected boil-off gas flow rate and boil-off gas pressure, and control the pressure regulating device (80) to perform pressure regulation; after the pressure regulation, the processor is used to determine the boil-off gas flow rate of the flow regulating device (82) according to the detected boil-off gas pressure, boil-off gas flow rate and boil-off gas pressure, and control the flow regulating device (82).

6. A supply system for a liquefied natural gas receiving station according to claim 5, characterized in that: The third delivery pipe (93) is also provided with a first temperature detection device (84), and the first temperature detection device (84) is used to detect the temperature of the gasified natural gas entering the mixing device (50); The first temperature detection device (84) is connected to a processor, and the processor is used to determine the evaporation gas flow rate of the flow regulating device (82) and the evaporation gas pressure of the pressure regulating device (80) according to the detected evaporation natural gas flow rate, evaporation natural gas pressure and evaporation natural gas temperature, and control the flow regulating device (82) and the pressure regulating device (80).

7. A supply system for a liquefied natural gas receiving station according to claim 6, characterized in that: The fourth delivery pipe (94) is also provided with a temperature regulating device (81), and the temperature regulating device (81) is used to regulate the temperature of the evaporated gas entering the mixing device (50); The temperature regulating device (81) is connected to a processor, and the processor is used to determine the evaporation gas flow rate of the flow regulating device (82), the evaporation gas pressure of the pressure regulating device (80), and the evaporation gas temperature of the temperature regulating device (81) according to the detected evaporation natural gas flow rate, evaporation natural gas pressure, and evaporation natural gas temperature, and to control the flow regulating device (82), the pressure regulating device (80), and the temperature regulating device (81).

8. A supply system for a liquefied natural gas receiving station according to claim 7, characterized in that: The temperature regulating device (81) is arranged between the second pressure detecting device (86) and the flow regulating device (82).

9. A supply system for a liquefied natural gas receiving station according to claim 8, characterized in that: A second temperature detection device (87) is provided on the fourth delivery pipe (94) between the temperature adjustment device (81) and the flow adjustment device (82), and the second temperature detection device (87) is used to detect the temperature of the evaporation gas after temperature adjustment; The second temperature detection device (87) is connected to the processor; The processor is used to determine the evaporation gas temperature of the temperature regulating device (81) according to the detected evaporation gas pressure, the gasified natural gas flow rate and the gasified natural gas pressure, and control the temperature regulating device (81) to perform temperature regulation; after the temperature regulation, determine the evaporation gas flow rate of the flow regulating device (82) according to the detected evaporation gas temperature, the gasified natural gas flow rate and the gasified natural gas pressure, and control the flow regulating device (82).

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