Double-wall pipe ventilation system

Abstract

The invention discloses a double-wall pipe ventilation system. The double-wall pipe ventilation system includes: an engine unit including a water jacket cooling circulation unit that dissipates heat generated by an engine; a fuel supply unit connected to the engine unit via the double-wall pipe and supplying fuel through an inner pipe of the double-wall pipe; an air outlet line along which air is discharged from the outer tube of the double-walled tube; an air circulation unit that circulates the air discharged along the air outlet line; and a water ejector which is provided to the air circulation unit and sucks the air circulated through the outer pipe using the high-pressure working fluid introduced into the water ejector.

Description

Technical Field

[0001] The present invention relates to a double-wall pipe ventilation system. More precisely, the present invention relates to a double-wall pipe ventilation system that circulates air through a double-wall pipe for supplying a gas such as LNG, which can be dangerous when leaked from a ship. Background Art

[0002] In ships and offshore structures (e.g., LNG carriers equipped with natural gas injection engines such as ME-GI, ME-GA, X-DF engines), double-wall pipes are used to prevent gas leakage in gas pipes and affect the safety zone.

[0003] That is, in the case of gas leakage from the inner pipe of the double-wall pipe, since LNG used as engine fuel does not need to leak into the safety zone (e.g., the engine room where the engine is installed), the outer pipe of the double-wall pipe is used to prevent gas leakage into the safety zone.

[0004] Here, the outer pipe is always ventilated during the gas mode operation of the engine to detect gas leakage. Usually, it is required that the outer pipe be ventilated 30 times per hour with dry air for potential gas leakage, and the air circulated through the outer pipe needs to be discharged to the outside of the ship or an area without a fire risk. Therefore, conventional ships and offshore structures are equipped with fans to suck air from the external environment.

[0005] However, the fans for air circulation are extremely expensive and consume a large amount of electricity. In addition, such fans are electrical equipment and thus require expensive explosion-proof enclosures. Summary of the Invention

[0006] Technical Problem

[0007] Embodiments of the present invention have been conceived to solve this problem in the art and provide a double-wall pipe ventilation system.

[0008] More precisely, an aspect of the present invention provides a double-wall pipe ventilation system having a simple and efficient structure instead of a fan for use in a ship or an offshore structure.

[0009] The present invention is not limited thereto, and other aspects of the present invention will become apparent to those of ordinary skill in the art from the following description in conjunction with the accompanying drawings.

[0010] Technical Solution

[0011] According to one aspect of the present invention, a double-wall pipe ventilation system includes: an engine unit including a water jacket cooling circulation unit that dissipates heat generated by the engine; a fuel supply unit connected to the engine unit via a double-wall pipe and supplying fuel through the inner pipe of the double-wall pipe; an air outlet pipeline through which air is discharged from the outer pipe of the double-wall pipe; an air circulation unit that circulates the air discharged along the air outlet pipeline; and a water injector provided to the air circulation unit and using a high-pressure working fluid introduced into the water injector to suck the air circulating through the outer pipe.

[0012] The water jacket cooling circulation unit may include: an air cooler and a water jacket that cool the scavenging air in the engine and dissipate the heat generated by the engine; a water jacket cooling circulation pump that circulates cooling water for heat exchange in the water jacket cooling circulation unit; a water jacket cooler that cools the cooling water to cool the air cooler and the water jacket; and a degasser that discharges air or gas generated in the water jacket cooling circulation unit.

[0013] The air circulation unit may include an expansion tank connected to the water jacket cooling circulation unit, receiving cooling water from the water jacket cooling circulation unit and storing the received cooling water, wherein the expansion tank may be connected to the water injector via a working fluid supply pipeline, and the working fluid may be the cooling water stored in the expansion tank.

[0014] The double-wall pipe ventilation system may further include: an injection pump and a working fluid control valve on the working fluid supply pipeline, wherein the injection pump may be operated to establish pressure in the working fluid supply pipeline so that the working fluid is supplied to the water injector to circulate the air supplied to the outer pipe of the double-wall pipe.

[0015] The water injector may be connected to the expansion tank via a recirculation pipeline so that the working fluid and air that have passed through the water injector are circulated back to the expansion tank.

[0016] The double-wall pipe ventilation system may further include: a guiding pipe through which the working fluid in the expansion tank circulates, wherein the guiding pipe may be connected to a discharge pipeline equipped with a gas detector, and when the gas detector detects gas leakage, the fuel supplied to the engine may be changed from gas to fuel oil.

[0017] According to another aspect of the present invention, a double-wall pipe ventilation method includes: a fuel supply step in which fuel is supplied from a fuel supply unit to an engine unit through the inner pipe of a double-wall pipe; and an air circulation step in which the air discharged through an air outlet pipeline is circulated, wherein the air circulation step includes sucking the air circulating through the outer pipe of the double-wall pipe by introducing a high-pressure working fluid into a water injector provided to an air circulation unit.

[0018] The fuel supply step may include a water jacket cooling cycle step in which scavenging air in the engine is cooled and heat generated by the engine is dissipated, wherein the water jacket cooling cycle step may include circulating cooling water through a water jacket cooling cycle unit and supplying the circulated cooling water to an air circulation unit.

[0019] The air circulation step may further include: a cooling water storage step in which cooling water is supplied from the water jacket cooling cycle unit to an expansion tank for storage therein; and a working fluid supply step in which a working fluid is supplied from the expansion tank to a water injector, wherein the working fluid may be the cooling water stored in the expansion tank.

[0020] The working fluid supply step may include operating an injection pump to establish pressure in a working fluid supply line and supplying the working fluid from the expansion tank to the water injector to circulate air supplied to an outer tube of a double-wall tube.

[0021] The working fluid supply step may further include a recirculation step in which the working fluid and air that have passed through the water injector are circulated back to the expansion tank.

[0022] The double-wall tube ventilation method may further include: a gas leakage detection step in which the gas leakage detection step may include: a first gas leakage detection step in which it is detected whether there is a gas leakage from an inner tube of the double-wall tube to an outer tube of the double-wall tube; and a second gas leakage detection step in which it is detected whether there is a gas leakage in the air circulation step.

[0023] When a gas leakage is detected in the first gas leakage detection step, the operation of the corresponding engine may be stopped, and when a gas leakage is detected in the second gas leakage detection step, the supply of fuel gas may be stopped and fuel may be supplied.

[0024] Advantageous Effects

[0025] As described above, the present invention provides a double-wall tube ventilation system.

[0026] Specifically, the present invention provides a double-wall tube ventilation system having a simple and efficient structure for use in a ship or marine structure instead of an expensive fan.

[0027] In addition, by using a water injector instead of an expensive fan, the ventilation system according to the present invention may not require a separate power source and is easy to maintain due to its simple structure.

[0028] In addition, since a multi-stage water injector can be used to meet a desired level of ventilation capacity, the ventilation system according to the present invention can ensure flexibility in design choices.

[0029] In addition, the ventilation system can significantly reduce the risk of gas explosion by using cooling water (fresh water or seawater) for air circulation, and an integrated gas leakage detection system can be established by associating with the ship's existing cooling system (water jacket cooling circulation unit).

[0030] In addition, the existing expansion tank in the ship can be used as a tank for storing the working fluid supplied to the water injector, and the existing gas leakage detectors of the water jacket coolers in each engine can be utilized, thereby allowing the detection of gas leakage from each engine simultaneously. That is to say, the ventilation system according to the present invention can detect the gas leakage from each engine simultaneously and can achieve a higher degree of vacuum than a conventional fan-based ventilation system, thereby ensuring more accurate and reliable ventilation in case of gas leakage.

[0031] In addition, in case of gas leakage from the inner tube of the double-wall tube, the safe discharge of the leaked gas can be ensured through safety monitoring and control, thereby allowing the construction of a safety system.

[0032] The present invention is not limited thereto, and according to the following description in conjunction with the drawings, other advantages of the present invention will become apparent to those of ordinary skill in the art. Description of the Drawings

[0033] Figure 1 It is a block diagram of a double-wall tube ventilation system according to an embodiment of the present invention. Detailed Description of the Embodiment

[0034] The above and other aspects, features, and advantages of the present invention will become apparent from the following detailed description of the embodiments in conjunction with the drawings.

[0035] The terms used herein are for the purpose of describing particular embodiments and are not intended to be limiting. As used herein, the terms "comprises", "comprising", "includes", and / or "including" when used in this specification specify the presence of the stated features, integers, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. In addition, it should be understood that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to another element or layer, or intervening elements may be present.

[0036] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. It should be understood that the embodiments provide a complete disclosure and thorough understanding of the present invention to those of ordinary skill in the art, and the present invention is not limited to the following embodiments and can be embodied in different ways by those of ordinary skill in the art.

[0037] Figure 1 It is a block diagram of a double-walled tube ventilation system according to an embodiment of the present invention.

[0038] Reference Figure 1 , the double-walled tube ventilation system according to the present invention may include an engine unit, a fuel supply unit, an air outlet pipeline, and an air circulation unit.

[0039] The engine unit includes a dual-fuel engine. Specifically, the engine unit may include an engine using natural gas among the engines used in a ship. For example, the engine may include one or more of the following: a MAN Electronic Gas-Injection (ME-GI) engine, an eXtra longstroke Dual Fuel (X-DF) engine, a DF engine (Dual Fuel Diesel Electric (DFDE)), and a Dual Fuel Diesel Generator (DFDG).

[0040] The engine unit is installed in an engine room (E / R) and may include one or more engines, such as a first engine (100a) and a second engine (100b). The number of engines can be adjusted as needed.

[0041] The fuel supply unit (110) supplies gas to the engine unit and may include a fuel storage tank (not shown in the figure) for storing gas.

[0042] The fuel supply unit (110) supplies gas to the first engine (100a) and the second engine (100b) via a main fuel supply pipeline (120a) and a main fuel supply pipeline (120b) respectively, and each of the main fuel supply pipeline (120a) and the main fuel supply pipeline (120b) may be provided with a main gas valve (111) to regulate the supply of gas.

[0043] Specifically, the main fuel supply pipeline (120a) and the main fuel supply pipeline (120b) may be composed of double-walled tubes formed by inner tubes (122a), inner tubes (122b) and outer tubes (121a), outer tubes (121b) to ensure the safe transportation of gases or the like, which may be dangerous when leaked. Here, the inner tubes (122a), inner tubes (122b) of the double-walled tube may serve as channels for supplying fuel, and the outer tubes (121a), outer tubes (121b) of the double-walled tube may serve as channels for air circulation to detect gas leakage while protecting the inner tubes (122a), inner tubes (122b).

[0044] The air circulated through the outer pipes (121a) and (121b) is supplied to the air circulation unit along the air outlet pipelines (252a) and (252b), where the air outlet pipelines (252a) and (252b) are equipped with first gas detectors (253a) and (253b) and flow detectors (254a) and (254b).

[0045] Specifically, the first gas detectors (253a) and (253b) mainly detect gas leakage from the inner pipes (122a) and (122b). When gas leakage is detected by the first gas detectors (253a) and (253b), the operation of the corresponding engine is switched from the gas mode to the oil mode.

[0046] The flow detectors (254a) and (254b) detect whether air continuously circulates through the outer pipes (121a) and (121b) of the double-walled pipe. When it is determined that air continuously circulates through the outer pipes (121a) and (121b), gas is supplied from the fuel supply unit to the engine unit. Here, the flow detectors (254a) and (254b) may have the ability to allow the space (volume) between the outer pipes (121a) and (121b) and the inner pipes (122a) and (122b) to be ventilated at a rate of 30 air changeovers per hour.

[0047] The air outlet pipelines (252a) and (252b) may further be equipped with pressure sensors (not shown in the figure) to measure the pressure in the air outlet pipelines (252a) and (252b).

[0048] Specifically, the normal pressure in the air outlet pipelines (252a) and (252b) is in the range from -0.5 bar to 0 bar. When the pressure value measured by the pressure sensor (not shown in the figure) is less than -0.5 bar, it can be determined that normal operation is not possible due to blockage upstream of the water injectors (250a) and (250b). When the pressure value measured by the pressure sensor (not shown in the figure) exceeds 0 bar, it can be determined that normal operation is not possible due to blockage downstream of the water injectors (250a) and (250b) or due to poor pumping conditions.

[0049] When it is determined that normal operation is not possible, the operation of the corresponding engine can be switched from the gas mode to the oil mode. Additionally, after solving the air circulation problem in the air outlet pipelines (252a) and (252b) and confirming that the pressure in the air outlet pipelines (252a) and (252b) returns to the normal range, the operation of the engine can be switched from the oil mode to the gas mode.

[0050] The engine unit may further include: a jacket cooling circulation unit that dissipates heat generated by the engines (100a, 100b); and condensate storage units (140a, 140b) that allow condensate or water introduced into the engines to automatically drain therein.

[0051] Specifically, the jacket cooling circulation unit includes: an air cooler and jackets (101a, 101b) that cool the scavenging air in the engines and dissipate heat generated by the engines; jacket cooling circulation pumps (102a, 102b) that circulate cooling water for heat exchange in the jacket cooling circulation unit; a jacket cooler (130) that cools the cooling water to cool the air cooler and jackets; and a deaerator (131) that discharges air or gas generated in the jacket cooling circulation unit.

[0052] The deaerator (131) may be connected to a cooling water re-supply pipe through which the cooling water heated while circulating through the air cooler and jackets (101a, 101b) is supplied back to the jacket cooler (130), and the air and gas separated by the deaerator (131) may be supplied to the air circulation unit through an air outlet pipe (132).

[0053] The air circulation unit may be connected to the jacket cooling circulation unit such that the cooling water heated while circulating through the air cooler and jackets (101a, 101b) can be supplied to the air circulation unit.

[0054] Specifically, the air circulation unit includes an expansion tank (210) and water ejectors (250a, 250b), where the expansion tank (210) is connected to the jacket cooling circulation unit via cooling water supply pipelines (103a, 103b) and is connected to the water ejectors (250a, 250b) via working fluid supply pipelines (220a, 220b).

[0055] The working fluid is supplied to the water ejectors (250a, 250b) along the working fluid supply pipelines (220a, 220b). Here, the working fluid may be the cooling water stored in the expansion tank.

[0056] That is, the expansion tank (210) is used to discharge air bubbles from the cooling water that cools the engines while circulating through the jacket cooling circulation unit and allows the water to expand / contract depending on the temperature, and the cooling water stored in the expansion tank (210) is supplied as the working fluid to the water ejectors (250a, 250b).

[0057] In addition, the expansion tank (210) is used to establish pressure in the entire water jacket cooling circulation unit and serves as an expansion compensation device. Furthermore, since the expansion tank (210) is disposed at the uppermost side of the water jacket cooling circulation unit, the expansion tank (210) is also used to discharge gas in the case of gas leakage.

[0058] The expansion tank (210) may be equipped with a water level measurement system (260) to measure the water level of the working fluid in the expansion tank. Specifically, in the case where the working fluid in the expansion tank (210) evaporates due to heat, makeup water may be automatically injected into the expansion tank (210) based on the measured water level of the working fluid in the expansion tank (210).

[0059] Therefore, the ventilation system may further include: a makeup water supply line (221) along which makeup water is automatically injected into the expansion tank (210); and a makeup water supply valve (222) disposed on the makeup water supply line (221) to control the supply of the working fluid.

[0060] The water ejectors (250a) and (250b) are devices that generate a vacuum by sucking air through converting a high-pressure working fluid into a low-pressure and high-speed fluid, and may be configured to suck the air circulating through the outer tubes (121a) and (121b) of the double-walled tube using the high-pressure working fluid introduced therein. Here, since the high-pressure working fluid has a higher density than air, the water ejector can suck a larger volume of air.

[0061] Specifically, the ventilation system may further include jet pumps (230a) and (230b), working fluid control valves (241a) and (241b), and discharge pressure sensors (242a) and (242b) on the working fluid supply lines (220a) and (220b), wherein the jet pumps (230a) and (230b) are operated to establish pressure in the working fluid supply line such that the working fluid is supplied to the water ejectors (250a) and (250b) to circulate the air supplied to the outer tubes (121a) and (121b) of the double-walled tube through the air outlet lines (252a) and (252b).

[0062] The discharge pressure sensors (242a) and (242b) are devices for measuring the pressure upstream of the water ejectors (250a) and (250b). If the pressure upstream of the water ejectors (250a) and (250b) is not maintained at a predetermined level or higher, then the water ejectors (250a) and (250b) will not be able to function properly. Therefore, when the pressure values measured by the discharge pressure sensors (242a) and (242b) are low, the working fluid control valves (241a) and (241b) can be controlled to maintain the pressure upstream of the water ejectors (250a) and (250b) at a predetermined level or higher.

[0063] In addition, since the working fluid supplied through the working fluid supply lines (220a) and (220b) is hot cooling water, the heat dissipation pipe 240a can be disposed upstream of the jet pumps (230a) and (230b) to protect the jet pumps (230a) and (230b), and the finned heat dissipation pipe can be disposed downstream of the jet pumps (230a) and (230b) to prevent problems such as adhesion caused by heat generation due to continuous use of the jet pumps (230a) and (230b).

[0064] The jet pumps (230a) and (230b) are composed of a working pump and a standby pump, such that when the pressure difference between the upstream and downstream of the jet pump drops to a predetermined level or lower, the standby pump is operated, indicating that the working pump is not functioning properly.

[0065] In addition, check valve circuits (251a) and (251b) can be disposed downstream of the air outlet lines (252a) and (252b) connected to the water ejectors (250a) and (250b) to prevent a small amount of working fluid from flowing back into the double-wall pipes (120a) and (120b) when the water ejectors (250a) and (250b) are initially supplied with working fluid and perform air suction.

[0066] In addition, the water ejectors (250a) and (250b) can be externally grounded to prevent the gas from exploding due to static electricity.

[0067] Furthermore, the water ejectors (250a) and (250b) can be connected to the expansion tank (210) via the recirculation lines (255a) and (255b), such that the working fluid and air that have passed through the water ejectors (250a) and (250b) are circulated back to the expansion tank (210).

[0068] The recirculation pipelines (255a) and (255b) may be equipped with output pressure sensors (256a) and (256b) to measure the pressure downstream of the water injectors (250a) and (250b) to observe whether the water injectors (250a) and (250b) are functioning properly. When the pressure values measured by the output pressure sensors (256a) and (256b) exceed a predetermined range, the working fluid control valves (241a) and (241b) may be controlled to control the flow rate and pressure of the working fluid.

[0069] The ventilation system may further include guide pipes (211a) and (211b) in the expansion tank (210) such that the working fluid recirculated along the recirculation pipelines (255a) and (255b) is introduced into the expansion tank (210) through the guide pipes, and gas and air contained in the cooling water from each engine (100a) and (100b) are prevented from flowing into other engines.

[0070] The guide pipes (211a) and (211b) may be connected to discharge pipelines (212a) and (212b), and the discharge pipelines (212a) and (212b) may be equipped with second gas detectors (213a) and (213b). When gas leakage is detected by the second gas detectors (213a) and (213b), the supply of fuel gas is stopped and fuel oil is supplied.

[0071] Here, since the gas introduced into the expansion tank is lighter than water or air, the gas can be separated within the guide pipes (211a) and (211b) and then discharged to the external atmosphere through the discharge pipelines (212a) and (212b).

[0072] The double-wall pipe ventilation system according to the present invention may further include a controller (not shown in the figure). The controller controls the operation of the double-wall pipe ventilation system. Specifically, the controller may control the flow of fuel gas and the operation mode of the engine based on the temperature and pressure information measured by the detectors and sensors in the system.

[0073] Hereinafter, a method of operating a double-wall pipe ventilation system according to an embodiment of the present invention will be described with reference to the above double-wall pipe ventilation system according to the present invention.

[0074] The method of operating a double-wall pipe ventilation system includes: a fuel supply step in which fuel is supplied from a fuel supply unit to an engine unit through the inner pipes (122a) and (122b) of the double-wall pipe; and an air circulation step in which the air discharged through the outer pipes (121a) and (121b) of the double-wall pipe is circulated.

[0075] The fuel supply step includes supplying LNG fuel as combustion gas to the engine unit, where the LNG fuel is supplied to the fuel heating unit along the main fuel supply line (400). The fuel supply unit supplies the combustion gas to the first engine (100a) and the second engine (100b) via the main fuel supply line (120a) and the main fuel supply line (120b), respectively.

[0076] Specifically, the main fuel supply line (120a) and the main fuel supply line (120b) are composed of double-walled pipes formed by inner pipes (122a), inner pipes (122b) and outer pipes (121a), outer pipes (121b) to ensure safe conveyance of gases or the like that may be dangerous in case of leakage. Here, the inner pipes (122a), inner pipes (122b) of the double-walled pipes can serve as channels for supplying fuel, and the outer pipes (121a), outer pipes (121b) of the double-walled pipes can serve as channels for air circulation to detect gas leakage while protecting the inner pipes (122a), inner pipes (122b).

[0077] The fuel supply step may further include a jacket cooling cycle step in which scavenging air in the engines (100a), (100b) is cooled and heat generated by the engines (100a), (100b) is dissipated. The jacket cooling cycle step may include circulating cooling water through a jacket cooling cycle unit and supplying the circulated cooling water to the air circulation unit.

[0078] For example, the jacket cooling cycle step includes supplying fresh water or seawater as cooling water to cool the engines, where the jacket cooling cycle pumps (102a), (102b) are operated to supply the cooling water from the jacket cooler (130) to the air cooler and the jackets (101a), (101b). Then, the engines are cooled by the cooling water supplied to the air cooler and the jackets (101a), (101b), and the cooling water heated by the heat from the engines is circulated to the jacket cooler (130) to be cooled by the jacket cooler (130) and then supplied back to the air cooler and the jackets (101a), (101b).

[0079] Here, when the heated cooling water contains air and gases, the heated cooling water may be supplied to the deaerator (131) to separate the air and gases from the cooling water, and the separated air and gases may be supplied to the air circulation unit through the air outlet pipe (132).

[0080] The air circulation unit is connected to the jacket cooling cycle unit such that the heated cooling water supplied during circulation through the air cooler and the jackets (101a), (101b) is supplied to the air circulation unit for use in the air circulation step.

[0081] The air circulation steps include: a cooling water storage step in which cooling water is supplied from a water jacket cooling circulation unit to an expansion tank (210) for storage in the expansion tank (210); and a working fluid supply step in which the working fluid is supplied from the expansion tank (210) to a water ejector (250a) and a water ejector (250b).

[0082] Here, the working fluid is supplied to the water ejector (250a) and the water ejector (250b) along a working fluid supply pipeline (220a) and a working fluid supply pipeline (220b). The working fluid can be the cooling water stored in the expansion tank.

[0083] Specifically, in the cooling water storage step, the cooling water heated by cooling the engine while circulating through the water jacket cooling circulation unit is stored in the expansion tank (210). The cooling water stored in the expansion tank (210) is supplied as a working fluid to the water ejector (250a) and the water ejector (250b). Here, the expansion tank (210) builds pressure in the entire water jacket cooling circulation unit, acts as an expansion compensation device, and discharges gas in the case of gas leakage.

[0084] The working fluid supply step includes operating an injection pump (230a) and an injection pump (230b) to build pressure in the working fluid supply pipeline and supplying the working fluid to the water ejector (250a) and the water ejector (250b) to circulate the air supplied to the outer pipes (121a) and (121b) of the double-wall pipe through an air outlet pipeline (252a) and an air outlet pipeline (252b). Here, a discharge pressure sensor (242a) and a discharge pressure sensor (242b) are used to measure the pressure upstream of the water ejector (250a) and the water ejector (250b). When the pressurized value measured by the discharge pressure sensor is low, the working fluid control valves (241a) and (241b) are controlled to maintain the pressure upstream of the water ejector at a predetermined level or higher.

[0085] The working fluid supply step further includes a recirculation step in which the working fluid and air that have passed through the water ejector (250a) and the water ejector (250b) are circulated back to the expansion tank (210).

[0086] Here, an output pressure sensor (256a) and an output pressure sensor (256b) arranged on a recirculation pipeline (255a) and a recirculation pipeline (255b) are used to measure the pressure downstream of the water ejector (250a) and the water ejector (250b). When the pressure value measured by the output pressure sensor exceeds a predetermined range, the working fluid control valves (241a) and (241b) are controlled to control the flow rate and pressure of the working fluid.

[0087] In addition, the ventilation system further includes guide pipes (211a) and guide pipes (211b) in an expansion tank (210), such that the working fluid recirculated along a recirculation pipeline (255a) and a recirculation pipeline (255b) is introduced into the expansion tank (210) through the guide pipes (211a) and the guide pipes (211b), and air and gas contained in the cooling water from each engine (100a) and engine (100b) are prevented from flowing into other engines.

[0088] The working fluid supply step may further include a water level measurement step in which the water level of the working fluid in the expansion tank (210) is measured.

[0089] The fluid water level measurement may be performed in real time, such that in the case where the working fluid in the expansion tank (210) evaporates due to heat, makeup water is automatically injected into the expansion tank (210) based on the measured water level of the working fluid in the expansion tank (210).

[0090] The method of operating the double-wall pipe ventilation system may further include a gas leak detection step. The gas leak detection step is performed in real time during the operation of the system, and includes a first gas leak detection step and a second gas leak detection step.

[0091] In the first gas leak detection step, first gas detectors (253a) and first gas detectors (253b) are used to detect whether there is a gas leak from the inner pipes (122a) and inner pipes (122b) of the double-wall pipe to the outer pipes (121a) and outer pipes (121b) of the double-wall pipe. When a gas leak is detected by the first gas detector, the operation of the corresponding engine is stopped.

[0092] In the second gas leak detection step, second gas detectors (213a) and second gas detectors (213b) are used to detect the presence of a gas leak in the air circulation step. When a gas leak is detected by the second gas detector, the supply of fuel gas to the engines (100a) and engines (100b) may be stopped and fuel may be supplied to the engines.

[0093] As described above, the present invention provides a double-wall pipe ventilation system.

[0094] Specifically, the present invention provides a double-wall pipe ventilation system having a simple and efficient structure for use in a ship or a marine structure instead of an expensive fan.

[0095] In addition, by using a water injector instead of an expensive fan, the ventilation system according to the present invention may not require a separate power source and is easy to maintain due to its simple structure.

[0096] In addition, since a multi-stage water ejector can be used to meet the desired level of ventilation capacity, the ventilation system according to the present invention can ensure flexibility in design choices.

[0097] Furthermore, the ventilation system can significantly reduce the risk of gas explosion by using cooling water (fresh water or seawater) for air circulation, and can establish an integrated gas leakage detection system by being associated with the existing cooling system (water jacket cooling circulation unit) of the ship.

[0098] Although some embodiments have been described herein, it should be understood that these embodiments are presented by way of example only and various modifications, changes, alterations, and equivalent embodiments can be made by those of ordinary skill in the art without departing from the spirit and scope of the present disclosure. Therefore, it should be understood that these embodiments are provided for illustrative purposes only and should not be construed as limiting the present disclosure in any way. The scope of the present disclosure should be defined by the appended claims, and the claims and their equivalents are intended to cover such modifications and the like when they fall within the scope and spirit of the present invention.

Claims

1. A double-wall pipe ventilation system, characterized in that, Comprising: An engine unit, including a water jacket cooling circulation unit for dissipating heat generated by the engine; A fuel supply unit, connected to the engine unit via a double-wall pipe and supplying fuel through the inner pipe of the double-wall pipe; An air outlet pipeline, through which air is discharged from the outer pipe of the double-wall pipe; An air circulation unit for circulating the air discharged along the air outlet pipeline; And A water injector, provided to the air circulation unit and using a high-pressure working fluid introduced into the water injector to suck air circulating through the outer pipe.

2. The double-wall pipe ventilation system according to claim 1, characterized in that, The water jacket cooling circulation unit includes: An air cooler and a water jacket for cooling scavenging air in the engine and dissipating heat generated by the engine; A water jacket cooling circulation pump for circulating cooling water for heat exchange in the water jacket cooling circulation unit; A water jacket cooler for cooling the cooling water to cool the air cooler and the water jacket; and A degasser for discharging air or gas generated in the water jacket cooling circulation unit.

3. The double-wall pipe ventilation system according to claim 1, characterized in that: The air circulation unit includes an expansion tank connected to the water jacket cooling circulation unit, receiving cooling water from the water jacket cooling circulation unit and storing the received cooling water; The expansion tank is connected to the water injector via a working fluid supply pipeline; and The working fluid is the cooling water stored in the expansion tank.

4. The double-wall pipe ventilation system according to claim 3, characterized in that, It further includes: An injection pump and a working fluid control valve located on the working fluid supply pipeline, wherein the injection pump is operated to establish pressure in the working fluid supply pipeline so that the working fluid is supplied to the water injector to circulate the air supplied to the outer pipe of the double-wall pipe.

5. The double-wall pipe ventilation system according to claim 4, wherein The water injector is connected to the expansion tank via a recirculation pipeline, so that the working fluid and air that have passed through the water injector are circulated back to the expansion tank.

6. The double-wall pipe ventilation system according to claim 3, characterized in that, It further includes: A guiding pipe, through which the working fluid in the expansion tank circulates, wherein the guiding pipe is connected to a discharge pipeline, and the discharge pipeline is equipped with a gas detector, and when gas leakage is detected by the gas detector, the fuel supplied to the engine is changed from gas to fuel oil.

7. A double-wall pipe ventilation method, characterized in that, Comprising: A fuel supply step, in which fuel is supplied from the fuel supply unit to the engine unit through the inner pipe of the double-wall pipe; And An air circulation step, in which the air discharged through the air outlet pipeline is circulated, wherein the air circulation step includes sucking the air circulating through the outer pipe of the double-wall pipe by introducing a high-pressure working fluid into a water injector provided to the air circulation unit.

8. The double-wall pipe ventilation method according to claim 7, wherein, The fuel supply step further includes a water jacket cooling circulation step, in which scavenging air in the engine is cooled and heat generated by the engine is dissipated. The water jacket cooling circulation step includes circulating cooling water through the water jacket cooling circulation unit and supplying the circulated cooling water to the air circulation unit.

9. The double-wall pipe ventilation method according to claim 7, characterized in that, The air circulation step further includes: A cooling water storage step, in which cooling water is supplied from the water jacket cooling circulation unit to an expansion tank to be stored in the expansion tank; and A working fluid supply step, in which the working fluid is supplied from the expansion tank to the water ejector, and the working fluid is the cooling water stored in the expansion tank.

10. The double-wall pipe ventilation method according to claim 9, wherein, The working fluid supply step includes operating an injection pump to establish pressure in a working fluid supply pipeline, and supplying the working fluid from the expansion tank to the water ejector to circulate air supplied to an outer tube of the double-walled tube.

11. The double-wall pipe ventilation method according to claim 10, characterized in that, The working fluid supply step further includes a recirculation step, in which the working fluid and air that have passed through the water ejector are circulated back to the expansion tank.

12. The double-wall pipe ventilation method according to claim 7, characterized in that, Further included is: A gas leakage detection step The gas leakage detection step includes: A first gas leakage detection step, in which it is detected whether there is gas leakage from an inner tube of the double-walled tube to an outer tube of the double-walled tube; and A second gas leakage detection step, in which it is detected whether there is gas leakage in the air circulation step.

13. The double-wall pipe ventilation method according to claim 12, characterized in that, When gas leakage is detected in the first gas leakage detection step, the operation of the corresponding engine is stopped, and when gas leakage is detected in the second gas leakage detection step, the supply of fuel gas is stopped and fuel oil is supplied.

Images