Gas supply system and method for simultaneously supplying high-pressure gas and low-pressure gas

Abstract

The invention relates to a gas supply system and method for simultaneously supplying high-pressure gas and low-pressure gas. The gas supply system and method are used for simultaneously supplying gas to a gas engine and a power generation auxiliary machine. Liquefied gas is extracted from an LNG storage tank, pressurized, heated, gasified and decompressed, and then supplied to a gas engine needing to use high-pressure gas and a power generation auxiliary machine needing to use low-pressure gas. The gas supply system comprises an LNG storage tank, a conveying pipeline, a pressurization component for increasing the pressure of LNG, a gasification component for gasifying the LNG, a pressure reduction component for reducing the pressure of gas, and a heating component for heating the gas.

Description

Technical Field

[0001] The present invention relates to a gas supply system and method for simultaneously supplying high-pressure gas and low-pressure gas, and more specifically, to a gas supply system and method for effectively supplying gas from a liquefied natural gas (LNG) tank to a gas engine requiring high gas pressure and an auxiliary power generation machine requiring low gas pressure at the same time. Background Art

[0002] With the development of international trade and shipping, the exhaust emissions of marine diesel engines fueled by petroleum products are increasingly polluting the current environment. The International Maritime Organization (IMO) has passed the "International Convention for the Prevention of Air Pollution from Ships", and the emission requirements for ships at sea are becoming increasingly higher. For this reason, WARTSILA and MAN B&W Diesel Inc. have launched dual-fuel medium-speed diesel engines and dual-fuel low-speed diesel engines. The characteristics of this type of diesel engine are that it can use both traditional petroleum products as fuel and clean energy natural gas as fuel. The advantage is that it is easy to meet Tier III emission requirements without or simply adding emission post-treatment technology, and it can be flexibly switched between diesel and natural gas modes, solving the current problem of unstable natural gas supply. Therefore, it has become the focus of development in countries around the world. At present, more and more ships use dual-fuel engines and dual-fuel auxiliary generators to provide ships with a steady supply of power and electricity.

[0003] Conventional gas supply systems can only supply gas of one pressure to natural gas combustion mechanisms. Such supply systems have the following problems: the gas supply pressure is single and cannot provide gas to combustion mechanisms with multiple gas pressure requirements.

[0004] For facilities with large liquefied natural gas cabins such as natural gas cargo ships, there is more natural gas. The power mechanism, power mechanism and boiler on the ship mostly use natural gas as fuel, but the pressure requirements of the gas are different. Based on the above situation, the present invention invents a gas supply system that supplies high-pressure gas and low-pressure gas at the same time, which can provide high-pressure and low-pressure gas at the same time to meet the different gas pressure requirements of different equipment on the ship. Summary of the invention

[0005] In order to solve the above-mentioned problems in the prior art, the present invention provides a gas supply system and method for simultaneously supplying high-pressure gas and low-pressure gas. In the process of supplying gas to gas engines and auxiliary power generation machines, gas sources with various pressures can be generated simultaneously to supply combustion mechanisms using LNG as fuel with different intake pressure requirements, thereby simplifying equipment configuration, reducing energy consumption requirements of the gas supply system, and improving the economy and safety of the gas supply system.

[0006] To achieve the above purpose, the technical solution of the present invention is as follows:

[0007] In a first aspect, the present invention provides a gas supply system for simultaneously supplying high-pressure gas and low-pressure gas, including an LNG storage tank, which is characterized in that it also includes:

[0008] A liquefied natural gas processing unit, comprising a delivery pipeline a and a pressurizing and gasifying component arranged on the delivery pipeline a, wherein one end of the delivery pipeline a is connected to the LNG storage tank, and is used to extract LNG from the LNG storage tank, and after being pressurized by the pressurizing component and gasified by the gasifying component, the LNG is output in two ways, namely, a first gas supply path and a second gas supply path;

[0009] A first gas supply path, used to supply the gasified gas from the liquefied natural gas processing unit to a gas engine requiring high-pressure gas;

[0010] The second gas supply path includes a decompression device and a heating component, which is used to first reduce the pressure of the gasified gas from the other path of the liquefied natural gas processing unit through the decompression device, then heat it through the heating component, and then supply it to the power generation auxiliary machine that requires low-pressure gas.

[0011] Second, the present invention provides a gas supply system for simultaneously supplying high-pressure gas and low-pressure gas, including an LNG storage tank, which is characterized in that it also includes:

[0012] The boil-off gas processing unit comprises a delivery pipeline d and a pressurizing component and a heating component arranged on the delivery pipeline d. One end of the delivery pipeline d is connected to the LNG storage tank, and is used to extract BOG from the LNG storage tank, and after being pressurized by the pressurizing component and heated by the heating component, the BOG is output in two ways, namely, a first gas supply path and a second gas supply path;

[0013] A first gas supply path, used for supplying the heated gas from the evaporation gas processing unit to a gas engine requiring high-pressure gas;

[0014] The second gas supply path includes a decompression device and a heating component, which is used to first reduce the pressure of the gas heated by the other path of the evaporative gas processing unit through the decompression device, and then heat it through the heating component before supplying it to the auxiliary power generation machine that requires low-pressure gas.

[0015] Third, a gas supply system for simultaneously supplying high-pressure gas and low-pressure gas, including an LNG storage tank, is characterized in that it also includes:

[0016] A liquefied natural gas processing unit comprises a delivery pipeline a and a pressurizing and gasifying component arranged on the delivery pipeline a. One end of the delivery pipeline a is connected to the LNG storage tank and is used to extract LNG from the LNG storage tank, and after being pressurized by the pressurizing component and gasified by the gasifying component, the LNG is input into a buffer tank;

[0017] The boil-off gas processing unit comprises a delivery pipeline d and a pressurizing component and a heating component arranged on the delivery pipeline d. One end of the delivery pipeline d is connected to the LNG storage tank, and is used to extract BOG from the LNG storage tank, and after being pressurized by the pressurizing component and heated by the heating component, the BOG is input into the buffer tank.

[0018] A buffer tank is used to merge the gas output from the LNG processing unit and the BOG processing unit, and then separate the gas output into two paths after ensuring the gas pressure is stable, namely, a first gas supply path and a second gas supply path;

[0019] A first gas supply path is used to supply the merged and stabilized gas to a gas engine requiring high-pressure gas;

[0020] The second gas supply path includes a decompression device and a heating component, which is used to first reduce the pressure of the merged and stabilized gas through the decompression device, and then heat it through the heating component before supplying it to the auxiliary power generation machine that requires low-pressure gas.

[0021] Fourthly, the present invention provides a gas supply method for simultaneously supplying high-pressure gas and low-pressure gas, which is used to supply gas to a gas engine and an auxiliary power generation machine, and is characterized in that it includes the following steps:

[0022] LNG is extracted from the LNG tank, pressurized, gasified, and then divided into two routes;

[0023] The gas after the first gasification is directly supplied to the gas engine requiring high-pressure gas;

[0024] The gas from the second gasification process is first decompressed by a decompression device, then heated by a heating component, and then supplied to auxiliary power generation equipment that requires low-pressure gas.

[0025] Fifth, the present invention provides a gas supply method for simultaneously supplying high-pressure gas and low-pressure gas, which is used to supply gas to a gas engine and an auxiliary power generation machine, and is characterized in that it includes the following steps:

[0026] BOG is extracted from the LNG tank, pressurized and heated, and then divided into two routes;

[0027] The first heated gas is directly supplied to a gas engine requiring high pressure gas;

[0028] The second heated gas is first decompressed by a decompression device, then heated by a heating component, and then supplied to the auxiliary power generation equipment that requires low-pressure gas.

[0029] Sixth, the present invention provides a gas supply method for simultaneously supplying high-pressure gas and low-pressure gas, which is used to supply gas to a gas engine and an auxiliary power generation machine, and is characterized in that it includes the following steps:

[0030] Extract LNG from the LNG tank, pressurize and degas, and then input it into the buffer tank;

[0031] BOG is extracted from the LNG tank, pressurized, heated, and then placed in a buffer tank;

[0032] The gases input into the buffer tank from two paths are merged, and after the gas pressure is controlled to be stable, they are divided into two output paths, namely the first gas supply path and the second gas supply path;

[0033] supplying the combined and stabilized gas to a gas engine requiring high-pressure gas;

[0034] The merged and stabilized gas is first depressurized and heated before being supplied to auxiliary power generation equipment that requires low-pressure gas.

[0035] Preferably, a pressure control valve and a pressure sensor are provided in the first gas supply path, which are used to control the switch of the pressure control valve according to the gas pressure measured by the pressure sensor, thereby controlling the gas pressure supplied to the gas engine.

[0036] Preferably, the pressurizing component is configured to extract LNG from the LNG storage tank, increase the pressure of the LNG by compressing the extracted LNG, and supply the pressurized LNG to the gas engine and the auxiliary power generation machine.

[0037] Preferably, the boosting component includes one or more pumps, and the pump group formed by the multiple pumps can be connected in parallel and run simultaneously, or can be connected in parallel and run individually.

[0038] Preferably, when the gas engine requires ultra-high pressure gas, another high-pressure component will be included between the boosting component and the gasification component, and the high-pressure component will continue to pressurize the LNG pressurized by the boosting component to meet the ultra-high pressure requirement of the gas engine.

[0039] Preferably, the LNG storage tank can be designed as a pressure-resistant storage tank to allow the pressure increase caused by the boil-off gas generated in the LNG storage tank. Or it can be designed as a pressure-intolerant atmospheric storage tank, in which case the boil-off gas generated by the self-evaporation of LNG in the LNG storage tank will be directly discharged through the gas supply system to supply gas to the gas engine and the auxiliary generator at the same time.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1) The present invention can process liquefied natural gas (LNG) and boil-off gas (BOG) at the same time, and flexibly provide high-pressure or low-pressure gas supply according to the needs of different equipment on board, ensuring that the ship can obtain gas with appropriate pressure and temperature under various operating conditions, thereby improving the overall operation stability and efficiency.

[0042] 2) By combining LNG gasification and BOG pressurization and heating, the system can efficiently utilize these two resources and reduce waste. At the same time, the split supply design allows high-pressure and low-pressure gases to be directly delivered to the corresponding equipment, reducing energy losses in the intermediate links.

[0043] 3) Using natural gas as fuel can significantly reduce the emission of sulfur oxides (SOx), nitrogen oxides (NOx) and particulate matter (PM) compared to traditional petroleum products, which helps reduce the pollution of ships to the environment. In addition, by optimizing the gas supply system, emissions can be further reduced to meet the environmental protection requirements of organizations such as the International Maritime Organization (IMO).

[0044] 4) In the process of supplying gas to gas engines and auxiliary power generation equipment, gas sources with various pressures can be generated simultaneously to supply combustion mechanisms fueled by LNG with different intake pressure requirements, thereby simplifying equipment configuration, reducing energy consumption requirements of the gas supply system, and improving the economy and safety of the gas supply system.

[0045] 5) Applicable to test benches for onshore gas engines or auxiliary power generators, ships, or deep-sea platforms and other large facilities that require the use of liquefied gas. The ship is an LNG carrier or bulk carrier, container ship, crude oil tanker, chemical tanker, or engineering ship that can use LNG as a power fuel, and the LNG storage tank can be an LNG storage tank or an LNG fuel storage tank that stores LNG as fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a schematic diagram of a gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to an embodiment of the present invention.

[0047] Figure 2 2 is a schematic diagram of a gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to another embodiment of the present invention.

[0048] Figure 3 2 is a schematic diagram of a gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to another embodiment of the present invention. DETAILED DESCRIPTION

[0049] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in order to provide a clearer understanding of the structure and use of the present invention, but this should not be used to limit the scope of protection of the present invention.

[0050] Figure 1 Schematic diagram of a gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to an embodiment of the present invention. Figure 1 As described in the foregoing, the gas supply system of the present invention supplies gas to the gas engine and the auxiliary power generation machine at the same time.

[0051] Figure 1 The gas supply system comprises: a delivery pipeline a, which is used to supply LNG extracted from an LNG storage tank 1 to a gas engine and an auxiliary power generation machine at the same time; and a booster pump 2 for increasing the pressure of LNG, which is installed in the delivery pipeline a between the LNG storage tank 1 and the gas engine and the auxiliary power generation machine; and a gasification component 3 for gasifying LNG, which is installed downstream of the booster pump 2 for increasing the pressure of LNG in the delivery pipeline a to gasify the pressurized LNG.

[0052] The booster pump 2 for increasing the pressure of LNG is used to compress LNG to meet the pressure requirements of the gas engine and the auxiliary power generation machine and supply LNG to the gas engine and the auxiliary power generation machine. According to this embodiment, the booster pump 2 is installed in the delivery pipeline a upstream of the LNG gasification component 3 outside the LNG storage tank 1, and can also be installed in the LNG storage tank 1. The booster pump 2 can also include one pump or multiple pumps, and the pump group formed by the multiple pumps can be connected in parallel and run simultaneously, or can be connected in parallel and run separately.

[0053] The gasification unit 3 for gasifying LNG is installed in the delivery pipeline a downstream of the booster pump 2 to heat and gasify the LNG, and then supply the LNG after heat exchange to the gas engine and the auxiliary power generation machine. The gasification unit 3 may also include one or more gasifiers, and multiple gasifiers may be connected in parallel and run simultaneously.

[0054] When the supply system supplies gas to (for example) the dual-fuel low-speed diesel engine and the medium-speed diesel engine of MDT Company at the same time, the pressure of the gas required by the dual-fuel low-speed diesel engine is 300 barg (gauge pressure). Considering the pressure drop loss caused by the excessive length of the transmission pipeline a, another high-pressure component will be included between the booster pump 2 and the gasification component 3 according to actual needs. The high-pressure component will continue to pressurize the LNG pressurized by the booster pump 2 to meet the gas ultra-high pressure requirements of the dual-fuel low-speed diesel engine of MDT Company. At this time, the LNG can be pressurized to 20-700 bar (gauge pressure), and the temperature of the LNG increases from about -163°C to about 0-60°C when passing through the gasification component 3, and then supplied to the dual-fuel low-speed diesel engine. In addition, the gas after passing through the gasification component 3 passes through the pressure reducing component 13 to reduce the gas pressure to the gas pressure required by the dual-fuel medium-speed engine, and then supplied to the dual-fuel medium-speed diesel engine.

[0055] When the supply system supplies gas to the dual-fuel low-speed diesel engine and the medium-speed diesel engine of (for example) WARTSILA at the same time, the pressure of the gas required by the dual-fuel low-speed diesel engine is 15.5 barg (gauge pressure), and the pressure of the gas required by the dual-fuel medium-speed diesel engine is 5.5 barg (gauge pressure). Considering the pressure drop loss caused by the excessive length of the transmission pipeline a, the LNG can be pressurized to 5-50 bar (gauge pressure) in the boosting pump 2 according to actual needs, and the temperature of the LNG increases from about -163°C to about 0-60°C when passing through the gasification component 3, and then supplied to the dual-fuel low-speed diesel engine. In addition, the gas after passing through the gasification component 3 passes through the pressure reducing component 13 to reduce the gas pressure to the gas pressure required by the dual-fuel medium-speed engine, and then supplied to the dual-fuel medium-speed diesel engine.

[0056] The buffer tank 6 is installed between the delivery pipeline a and the gas engine at the downstream of the gasification component 3, close to the gas engine. After the gas enters the buffer tank 6, a stable pressure is formed, but the buffer tank 6 is not necessary.

[0057] The pressure sensor 12 is installed in the delivery pipe a between the downstream of the buffer tank 6 and the gas engine. The pressure control valve 11 is installed in the delivery pipe a between the downstream of the buffer tank 6 and the pressure sensor 12 so as to control the gas pressure supplied to the gas engine according to the pressure of the pressure sensor 12.

[0058] The decompression component 13 is installed in the delivery pipe a between the downstream of the buffer tank 6 and the auxiliary power generation machine, and the decompression component 13 reduces the gas pressure to a gas pressure that meets the requirements of the auxiliary power generation machine, and then supplies the gas to the auxiliary power generation machine.

[0059] A heating device 14 may also be arranged between the decompression component 13 and the auxiliary power generation machine for heating the gas which has been cooled down after decompression expansion to meet the gas temperature requirement of the auxiliary power generation machine.

[0060] Figure 2 FIG. 1 is a schematic diagram of a gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to another embodiment of the present invention. Figure 2 As described in the foregoing, the gas supply system of the present invention supplies gas to the gas engine and the auxiliary power generation machine at the same time.

[0061] Figure 2 The gas supply system comprises: a delivery pipeline d for simultaneously supplying BOG extracted from the LNG storage tank 1 to the gas engine and the auxiliary power generation machine; and a boil-off gas compressor 4 for increasing the BOG pressure, installed in the delivery pipeline d between the LNG storage tank 1 and the gas engine and the auxiliary power generation machine; and a gas heater 5 for heating the BOG, which is installed downstream of the gas compressor 4 for increasing the BOG pressure in the delivery pipeline d to heat the pressurized BOG.

[0062] The buffer tank 6 is installed between the delivery pipeline a and the gas engine at the downstream of the gasification component 3, close to the gas engine. After the gas enters the buffer tank 6, a stable pressure is formed, but the buffer tank 6 is not necessary.

[0063] The pressure sensor 12 is installed in the delivery pipe a between the downstream of the buffer tank 6 and the gas engine. The pressure control valve 11 is installed in the delivery pipe a between the downstream of the buffer tank 6 and the pressure sensor 12 so as to control the pressure of the gas supplied to the gas engine according to the pressure of the pressure sensor 12.

[0064] The decompression component 13 is installed in the delivery pipe a between the downstream of the buffer tank 6 and the auxiliary power generation machine, and the decompression component 13 reduces the gas pressure to a gas pressure that meets the requirements of the auxiliary power generation machine, and then supplies the gas to the auxiliary power generation machine.

[0065] A heating device 14 may also be arranged between the decompression component 13 and the auxiliary power generation machine for heating the gas which has been cooled down after decompression expansion to meet the gas temperature requirement of the auxiliary power generation machine.

[0066] When the supply system supplies gas to (for example) the dual-fuel low-speed diesel engine and the medium-speed diesel engine of MDT Company at the same time, the pressure of the gas required by the dual-fuel low-speed diesel engine is 300 barg (gauge pressure). Considering the pressure drop loss caused by the excessive length of the boil-off gas supply pipeline d, the boil-off gas compressor 4 can pressurize the BOG to 20-700 bar (gauge pressure), and the temperature of the BOG increases from about -163°C to about 0-60°C when passing through the gas heater 5, and then supplies it to the dual-fuel low-speed diesel engine. In addition, the gas after passing through the gasification component 3 passes through the pressure reducing component 13 to reduce the gas pressure to the gas pressure required by the dual-fuel medium-speed engine, and then supplies it to the dual-fuel medium-speed diesel engine.

[0067] When the supply system simultaneously supplies gas to a dual-fuel low-speed diesel engine and a medium-speed diesel engine (for example) of WARTSILA, the pressure of the gas required by the dual-fuel low-speed diesel engine is 15.5 barg (gauge pressure), and the pressure of the gas required by the dual-fuel medium-speed diesel engine is 5.5 barg (gauge pressure). Considering the pressure drop loss caused by the excessive length of the boil-off gas supply pipeline d, the boil-off gas compressor 4 can pressurize the BOG to a pressure of 5-19.9 bar (gauge pressure), and the temperature of the BOG increases from about -163°C to about 0-60°C when passing through the gas heater 5, and then is supplied to the dual-fuel low-speed diesel engine. In addition, the gas after passing through the gasification component 3 passes through the pressure reducing component 13 to reduce the gas pressure to the gas pressure required by the dual-fuel medium-speed engine, and then is supplied to the dual-fuel medium-speed diesel engine.

[0068] exist Figure 3 In the embodiment, Figure 1 Gas supply system of the embodiment and Figure 2 The gas supply systems of the embodiment are used in parallel.

[0069] The gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to the present invention can be used in large facilities that require the use of LNG, such as test benches for land-based gas engines or auxiliary power generation equipment, ships, or deep-sea platforms.

[0070] The ship may be an LNG fuel carrier. The LNG fuel carrier has an LNG fuel storage tank for storing LNG fuel. In this case, the LNG storage tank 1 is an LNG fuel storage tank.

[0071] In addition, the ship may also be a ship that uses LNG as fuel for propulsion, such as a bulk carrier, a container ship, a crude oil tanker, a chemical tanker, and an engineering ship. Such a ship has an LNG fuel storage tank for storing LNG as fuel. In this case, the LNG storage tank 1 is an LNG fuel tank for storing LNG as fuel.

[0072] The gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to the present invention can be matched according to the type of ship. When the ship is a large liquefied gas transport ship, the LNG storage tank is a liquefied gas storage tank. The large storage tank capacity forms a large amount of boil-off gas, and the boil-off gas fully meets the full-load operation of the gas engine, and can be used. Figure 2 Embodiment configuration of the gas supply system on board; when the ship is a small LNG transport ship, the boil-off gas can only meet the partial load operation of the gas engine, and can be used Figure 3 Embodiment configuration of the gas supply system on board; when the ship is a non-liquefied gas transport ship using LNG fuel, the LNG storage tank is only used to store liquefied gas as fuel, the storage tank capacity is small, and the amount of boil-off gas formed is small. The boil-off gas can be directly supplied to the combustion unit (such as a gas boiler), and can be used Figure 1 An embodiment configures a gas supply system on board a ship.

[0073] The gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to the present invention can be used as a gas supply system for gas engines and power generation auxiliary machines of large-scale facilities, and can also be used as a gas supply system for land-based diesel engine test benches in diesel engine manufacturers. Since the land-based test benches require less LNG fuel and the amount of boil-off gas generated by the small storage tank capacity is small, the boil-off gas can be directly supplied to the combustion unit (such as a gas boiler), and can be used Figure 1 The embodiment configures a gas supply system for a marine diesel engine test bench.

[0074] Although the present invention has been shown and described herein with reference to specific embodiments, it should be understood that various modifications, changes and corrections may occur to those skilled in the art, and therefore the description and drawings herein should be interpreted for illustrative purposes only and not to limit the scope and spirit of the present invention.

Claims

1. A gas supply system for simultaneously supplying high-pressure gas and low-pressure gas, comprising an LNG storage tank, characterized in that: Also includes: A liquefied natural gas processing unit, comprising a delivery pipeline a and a pressurizing and gasifying component arranged on the delivery pipeline a, wherein one end of the delivery pipeline a is connected to the LNG storage tank, and is used to extract LNG from the LNG storage tank, and after being pressurized by the pressurizing component and gasified by the gasifying component, the LNG is output in two ways, namely, a first gas supply path and a second gas supply path; A first gas supply path, used to supply the gasified gas from the liquefied natural gas processing unit to a gas engine requiring high-pressure gas; The second gas supply path includes a decompression device and a heating component, which is used to first reduce the pressure of the gasified gas from the other path of the liquefied natural gas processing unit through the decompression device, then heat it through the heating component, and then supply it to the power generation auxiliary machine that requires low-pressure gas.

2. The gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to claim 1, characterized in that: A pressure control valve and a pressure sensor are provided in the first gas supply path, which are used to control the switch of the pressure control valve according to the gas pressure measured by the pressure sensor, thereby controlling the gas pressure supplied to the gas engine.

3. A gas supply system for simultaneously supplying high-pressure gas and low-pressure gas, comprising an LNG storage tank, characterized in that: Also includes: The boil-off gas processing unit comprises a delivery pipeline d and a pressurizing component and a heating component arranged on the delivery pipeline d. One end of the delivery pipeline d is connected to the LNG storage tank, and is used to extract BOG from the LNG storage tank, and after being pressurized by the pressurizing component and heated by the heating component, the BOG is output in two ways, namely, a first gas supply path and a second gas supply path; A first gas supply path, used for supplying the heated gas from the evaporation gas processing unit to a gas engine requiring high-pressure gas; The second gas supply path includes a decompression device and a heating component, which is used to first reduce the pressure of the gas heated by the other path of the evaporative gas processing unit through the decompression device, and then heat it through the heating component before supplying it to the auxiliary power generation machine that requires low-pressure gas.

4. The gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to claim 3, characterized in that: A pressure control valve and a pressure sensor are provided in the first gas supply path, which are used to control the switch of the pressure control valve according to the gas pressure measured by the pressure sensor, thereby controlling the gas pressure supplied to the gas engine.

5. A gas supply system for simultaneously supplying high-pressure gas and low-pressure gas, comprising an LNG storage tank, characterized in that: Also includes: A liquefied natural gas processing unit comprises a delivery pipeline a and a pressurizing and gasifying component arranged on the delivery pipeline a. One end of the delivery pipeline a is connected to the LNG storage tank and is used to extract LNG from the LNG storage tank, and after being pressurized by the pressurizing component and gasified by the gasifying component, the LNG is input into a buffer tank; The boil-off gas processing unit comprises a delivery pipeline d and a pressurizing component and a heating component arranged on the delivery pipeline d. One end of the delivery pipeline d is connected to the LNG storage tank, and is used to extract BOG from the LNG storage tank, and after being pressurized by the pressurizing component and heated by the heating component, the BOG is input into the buffer tank. A buffer tank is used to merge the gas output from the LNG processing unit and the BOG processing unit, and then separate the gas output into two paths after ensuring the gas pressure is stable, namely, a first gas supply path and a second gas supply path; A first gas supply path is used to supply the merged and stabilized gas to a gas engine requiring high-pressure gas; The second gas supply path includes a decompression device and a heating component, which is used to first reduce the pressure of the merged and stabilized gas through the decompression device, and then heat it through the heating component before supplying it to the auxiliary power generation machine that requires low-pressure gas.

6. The gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to claim 5, characterized in that: A pressure control valve and a pressure sensor are provided in the first gas supply path, which are used to control the switch of the pressure control valve according to the gas pressure measured by the pressure sensor, thereby controlling the gas pressure supplied to the gas engine.

7. The gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to any one of claims 1 to 6, characterized in that: The pressurizing component is configured to extract LNG from the LNG storage tank, increase the pressure of the LNG by compressing the extracted LNG, and supply the pressurized LNG to the gas engine and the auxiliary power generation machine.

8. The gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to claim 7, characterized in that: The pressurizing component includes one or more pumps. The pump group formed by the multiple pumps can be connected in parallel and run simultaneously, or can be connected in parallel and run individually.

9. The gas supply system for simultaneously supplying high-pressure gas and low-pressure gas according to claim 1 or 2, characterized in that: When the gas engine requires ultra-high pressure gas, another high-pressure component will be included between the boosting component and the gasification component. The high-pressure component will continue to pressurize the LNG pressurized by the boosting component until it meets the ultra-high pressure requirements of the gas engine.

10. A gas supply method for simultaneously supplying high-pressure gas and low-pressure gas, used for supplying gas to a gas engine and an auxiliary power generation machine, characterized in that: The following steps are involved: LNG is extracted from the LNG tank, pressurized, gasified, and then divided into two routes; The gas after the first gasification is directly supplied to the gas engine requiring high-pressure gas; The gas from the second gasification process is first decompressed by a decompression device, then heated by a heating component, and then supplied to auxiliary power generation equipment that requires low-pressure gas.

11. A gas supply method for simultaneously supplying high-pressure gas and low-pressure gas, used for supplying gas to a gas engine and an auxiliary power generation machine, characterized in that: The following steps are involved: BOG is extracted from the LNG tank, pressurized and heated, and then divided into two routes; The first heated gas is directly supplied to a gas engine requiring high pressure gas; The second heated gas is first decompressed by a decompression device, then heated by a heating component, and then supplied to the auxiliary power generation equipment that requires low-pressure gas.

12. A gas supply method for simultaneously supplying high-pressure gas and low-pressure gas, used for supplying gas to a gas engine and an auxiliary power generation machine, characterized in that: The following steps are involved: Extract LNG from the LNG tank, pressurize and degas, and then input it into the buffer tank; BOG is extracted from the LNG tank, pressurized, heated, and then placed in a buffer tank; The gases input into the buffer tank from two paths are merged, and after the gas pressure is controlled to be stable, they are divided into two output paths, namely the first gas supply path and the second gas supply path; supplying the combined and stabilized gas to a gas engine requiring high-pressure gas; The merged and stabilized gas is first depressurized and heated before being supplied to auxiliary power generation equipment that requires low-pressure gas.

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