Gas treatment system and vessel comprising the same

Abstract

The present application relates to a kind of gas processing system and the ship comprising it, wherein, gas processing system includes: first fuel supply flow path, fuel is supplied to main engine;Second fuel supply flow path, branch from the first fuel supply flow path, fuel is supplied to auxiliary engine;Heat exchanger is set to the first fuel supply flow path, and fuel is heated;And the cooling water circulation flow path of the main engine is set to supply heat source to the heat exchanger, the cooling water circulation flow path is set to, it can be separated into the first cooling water circulation flow path circulating through the heat exchanger and the second cooling water circulation flow path circulating through the main engine.

Description

TECHNICAL FIELD

[0001] The present invention relates to a gas treatment system and a ship including the same. BACKGROUND

[0002] A ship is a transport tool that loads a large amount of minerals, crude oil, natural gas, or several thousand or more containers and sails on the sea, and is made of steel and moves by the propulsive force generated by the rotation of a propeller in a state of floating on the water surface.

[0003] Such a ship generates a propulsive force by driving an engine or a gas turbine, and at this time, the engine uses oil fuel such as gasoline or diesel to move a piston, so that a crankshaft is rotated by the reciprocating motion of the piston, an axle connected to the crankshaft is rotated, and thus a propeller is driven, and the gas turbine uses a method of burning fuel together with compressed air, rotating turbine blades by the temperature / pressure of the burned air, and thus generating electricity and transmitting power to the propeller.

[0004] However, recently, in an LNG transport ship that transports liquefied natural gas (LNG) as a kind of liquefied gas, an LNG fuel supply method of driving an engine or a turbine at a demand place by using LNG as fuel is used, and since LNG is a clean fuel and is also more abundant in storage than oil, a method of using LNG as fuel at a demand place is also applied to other ships other than the LNG transport ship.

[0005] However, until now, there are many problems to be solved in the case of using LNG as a gaseous fuel compared to the existing case of using oil fuel such as diesel, and thus research and development of a technology of using LNG as a clean fuel and supplying it to a demand place in a ship is continuously ongoing. SUMMARY

[0006] Problems to be Solved by the Invention

[0007] The present invention has been made to solve the problems of the related art described above, and an object of the present invention is to provide a gas treatment system and a ship including the same, which can reduce energy use by applying waste heat of cooling water heated in an engine to heat liquefied gas flowing into the engine.

[0008] Technical Solution to Solve the Problems

[0009] The gas processing system according to one aspect includes: a first fuel supply flow path that supplies fuel to a main engine; a second fuel supply flow path that branches from the first fuel supply flow path and supplies fuel to an auxiliary engine; a heat exchanger that is provided in the first fuel supply flow path and heats the fuel; and a cooling water circulation flow path of the main engine that is provided to supply a heat source to the heat exchanger, the cooling water circulation flow path being configured to be separable into a first cooling water circulation flow path that circulates through the heat exchanger and a second cooling water circulation flow path that circulates through the main engine.

[0010] Specifically, the gas processing system can further include: a first branch flow path that connects both ends of the first cooling water circulation flow path to circulate cooling water through the heat exchanger while bypassing the main engine; and a second branch flow path that connects both ends of the second cooling water circulation flow path to circulate cooling water through the main engine while bypassing the heat exchanger.

[0011] Specifically, the gas processing system can include a backup heater provided in the first cooling water circulation flow path or the first branch flow path, the backup heater being configured to heat and supply cooling water to the heat exchanger when a load of the main engine is less than a predetermined value or when cooling water bypasses the main engine by means of the first branch flow path.

[0012] Specifically, the gas processing system can further include a bypass flow path configured to bypass the backup heater when cooling water is supplied to the heat exchanger via the main engine through the cooling water circulation flow path.

[0013] Specifically, the first branch flow path can circulate cooling water through the heat exchanger while bypassing the main engine when the main engine is stopped.

[0014] Specifically, cooling water can circulate through the heat exchanger and the main engine while circulating along the entire cooling water circulation flow path, or can circulate through the heat exchanger while bypassing the main engine and circulating along the first cooling water circulation flow path and the first branch flow path, or can circulate through the main engine while bypassing the heat exchanger and circulating along the second cooling water circulation flow path and the second branch flow path.

[0015] Specifically, a first closed loop formed by the first cooling water circulation flow path and the first branch flow path can be configured to be independent of a second closed loop formed by the second cooling water circulation flow path and the second branch flow path.

[0016] Specifically, the gas treatment system can further include an expansion tank configured to adjust a pressure of the cooling water flowing along the first closed loop or the second closed loop.

[0017] The ship according to an aspect of the present application has the gas treatment system.

[0018] Effects of the Invention

[0019] The gas treatment system according to the present application and the ship including the same can heat the liquefied gas using the cooling water for the main engine, thereby achieving efficient vaporization of the liquefied gas, and can secure stable heating of the liquefied gas even if the main engine is stopped or the heat of the cooling water is insufficient. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a conceptual view of a gas treatment system according to an embodiment of the present application.

[0021] Figure 2 is a conceptual view of a gas treatment system according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] The objects, specific advantages and novel features of the present application will be apparent from the following detailed description and preferred embodiments associated with the accompanying drawings. In the present specification, when numerals are assigned to components of each drawing, the same numerals are assigned, if possible, to the same components even if they are shown in different drawings. In addition, in explaining the present application, if it is judged that the explanation of related known technologies unnecessarily confuses the gist of the present application, the detailed explanation thereof is omitted.

[0023] Hereinafter, the fuel can be a liquefied gas, and the liquefied gas can be LPG, LNG, ethane, etc., for example, can refer to LNG (Liquefied Natural Gas), and the boil-off gas can refer to BOG (Boil Off Gas) such as LNG vaporized as natural gas. In addition, hereinafter, the liquefied gas can be used as a term including a liquid state or a gas state such as natural gasification or forced gasification, and the boil-off gas can be used as a term for a gas naturally vaporized in a liquefied gas storage tank.

[0024] For reference, the present application includes a ship having the gas treatment system described below. At this time, the ship is an expression including a general merchant ship or a marine facility such as FLNG, FSRU, and the like, and can further be replaced with a facility installed on land or the like.

[0025] Hereinafter, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0026] Figure 1 and Figure 2is a conceptual diagram of a gas handling system according to an embodiment of the present application.

[0027] For reference, Figure 1 is a diagram indicating a state in which the load of the main engine E1 is a predetermined value or more, Figure 2 is a diagram indicating a state in which the load of the main engine E1 is less than the predetermined value or the main engine E1 is not operating.

[0028] For reference, Figure 1 and Figure 2 The gas handling system 1 according to an embodiment of the present application includes a liquefied gas storage tank 10, a cooling water pump 21, a cooling water cooler 22, a fresh water generator 23, a heat exchanger 30, a booster pump 41, a backup heater 42, and a gas separator 43.

[0029] At this time, the cooling water pump 21, the cooling water cooler 22, the fresh water generator 23, the heat exchanger 30, the booster pump 41, the backup heater 42, and the gas separator 43 can be disposed along a cooling water circulation flow path L20, and the cooling water pump 21, the cooling water cooler 22, and the fresh water generator 23 can be disposed in a first closed loop, and the heat exchanger 30, the booster pump 41, the backup heater 42, and the gas separator 43 can be disposed in a second closed loop, which will be described later.

[0030] The liquefied gas storage tank 10 stores liquefied gas. The liquefied gas storage tank 10 is an independent type tank in compliance with the IMO regulation, and can be a Type A, Type B, Type C, or the like, or can be a membrane type tank.

[0031] The liquefied gas storage tank 10 can store liquefied gas at an extremely low temperature, but as heat penetrates from the outside, the liquefied gas naturally evaporates, thereby generating boil-off gas. At this time, since the internal pressure of the liquefied gas storage tank 10 rises due to the boil-off gas, in order to stably maintain the internal pressure of the liquefied gas storage tank 10, the boil-off gas can be discharged to the outside.

[0032] The liquefied gas (and / or boil-off gas) contained in the liquefied gas storage tank 10 can be supplied to the engines E1, E2, etc. as a demand to be used. At this time, the engines E1, E2 can include a main engine E1 (ME-GI, X-DF, ME-LGI, ME-GIE, etc.) for propelling a ship, and an auxiliary engine E2, which is a power generation engine for covering an in-ship power load, etc.

[0033] A fuel supply flow path L30 can be provided for supplying the liquefied gas stored in the liquefied gas storage tank 10 to the engines El, E2, and specifically, the fuel supply flow path L30 can include a first fuel supply flow path L31 for supplying the liquefied gas to the main engine El and a second fuel supply flow path L32 for supplying the liquefied gas to the auxiliary engine E2. At this time, a heat exchanger 30 is provided in the first fuel supply flow path L31, and the second fuel supply flow path L32 branches from the downstream of the heat exchanger 30 in the first fuel supply flow path L31 and can be connected to the auxiliary engine E2. In addition, a valve (not labeled) or a gas valve unit (not labeled) or the like that controls the flow of the liquefied gas can be provided in the first fuel supply flow path L31 and the second fuel supply flow path L32.

[0034] The cooling water circulation flow path L20 can include a first cooling water circulation flow path L20a that circulates through the heat exchanger 30 and a second cooling water circulation flow path L20b that circulates through the main engine El, and the first cooling water circulation flow path L20a and the second cooling water circulation flow path L20b can be connected to each other to form a closed loop. In addition, the first cooling water circulation flow path L20a and the second cooling water circulation flow path L20b can be configured so that the flow of the cooling water can be separated from each other.

[0035] Hereinafter, first, the cooling water pump 21, the cooling water cooler 22, and the clean water generator 23 provided on the cooling water circulation flow path L20 on the main engine El side (the second cooling water circulation flow path L20b) will be described.

[0036] The cooling water pump 21 can pump the cooling water to circulate the cooling water along the cooling water circulation flow path L20. The cooling water circulation flow path L20 in which the cooling water pump 21 is provided can form a closed loop to circulate the cooling water to be supplied to the main engine El and the heat exchanger 30 described later, which use the liquefied gas as fuel. However, the cooling water described in this specification can also be used for the auxiliary engine E2 other than the main engine El.

[0037] The cooling water pump 21 can be disposed upstream of the main engine El in the cooling water circulation flow path L20, and a plurality of the cooling water pump 21 can be provided in parallel to be able to back up each other.

[0038] The cooling water pump 21 can supply the cooling water cooled by the cooling water cooler 22 described later to the main engine El, and as illustrated, the cooling water pump 21 can be provided downstream of the cooling water cooler 22. Alternatively, unlike the drawing, the cooling water pump 21 can be disposed upstream of the cooling water cooler 22 in the cooling water circulation flow path L20.

[0039] The cooling water cooler 22 cools the cooling water that is heated at the same time as the main engine El. The cooling water cooler 22 can use sea water, fresh water, air, or the like as a refrigerant to cool the cooling water, and can be provided upstream of the cooling water pump 21 in the cooling water circulation flow path L20 or the like.

[0040] The cooling water circulation flow path L20 is configured so that at least a portion of the cooling water bypasses the cooling water cooler 22, whereby the temperature of the cooling water can be adjusted downstream of the cooling water cooler 22. That is, if the amount of cooling water that bypasses the cooling water cooler 22 increases in the cooling water flowing upstream of the cooling water cooler 22, the temperature downstream of the cooling water cooler 22 becomes higher, and conversely, if the amount of cooling water that bypasses the cooling water cooler 22 decreases, the temperature downstream of the cooling water cooler 22 becomes lower.

[0041] The amount of cooling water that bypasses the cooling water cooler 22 can be determined in accordance with the temperature of the cooling water that is delivered to the cooling water cooler 22, or in accordance with the load of the main engine El that affects the temperature of the cooling water.

[0042] The fresh water generator 23 generates fresh water using the waste heat of the cooling water. The fresh water generator 23 can generate steam by heating sea water or the like using the high-temperature cooling water discharged from the main engine El, and generate fresh water from the steam. Of course, in addition to this, the fresh water generator 23 can employ any of the various ways in which fresh water can be heated using cooling water.

[0043] The fresh water generator 23 can deliver fresh water to a fresh water tank (not shown), and the cooling water can bypass the fresh water generator 23 in the case where the storage amount of the fresh water tank is sufficient or additional fresh water does not need to be generated.

[0044] That is, as with the cooling water cooler 22, the cooling water circulation flow path L20 can be configured so as to bypass the fresh water generator 23. In addition, the temperature of the cooling water decreases at the same time as passing through the fresh water generator 23, and therefore by adjusting the amount of cooling water that bypasses the fresh water generator 23 in the cooling water circulation flow path L20, the temperature of the cooling water downstream of the fresh water generator 23 can be adjusted.

[0045] The fresh water generator 23 is provided upstream of the cooling water cooler 22 in the cooling water circulation flow path L20, whereby the high-temperature cooling water discharged from the main engine El can first be cooled by passing through the fresh water generator 23, and then be cooled again in the cooling water cooler 22.

[0046] The first branch flow path L21 and the second branch flow path L22 are provided in the cooling water circulation flow path L20, and the cooling water can circulate in a closed loop formed by the cooling water circulation flow path L20, or can circulate in a first closed loop and a second closed loop formed by the first branch flow path L21 and the second branch flow path L22. Details of this will be described later.

[0047] The heat exchanger 30 heats the liquefied gas and supplies it to the main engine El or the auxiliary engine E2, etc. The heat exchanger 30 is a configuration that exchanges heat between the heat medium and the liquefied gas, and can be of a shell & tube, bath type, PCHE, etc., but the type is not limited thereto.

[0048] The heat exchanger 30 is provided on the first fuel supply flow path L31, and can have a flow path for the liquefied gas to flow and a flow path for the heat medium to flow. The liquefied gas is transmitted to the engines El, E2 after being heated to a temperature corresponding to the temperature required by the engines El, E2 in the heat exchanger 30, and the heat medium is cooled by the liquefied gas after flowing into the heat exchanger 30 at a high temperature, and then flows out of the heat exchanger 30.

[0049] In the present embodiment, the heat medium can be cooling water for the engines El, E2. The heat exchanger 30 can be provided as a type that directly exchanges heat between the cooling water and the liquefied gas, and the cooling water can be used in the main engine El among the engines El, E2. Therefore, one side of the heat exchanger 30 can be connected to the first fuel supply flow path L31, and the other side can be connected to a cooling water circulation flow path L20 for the cooling water to flow.

[0050] Of course, the present application can also include an indirect heat exchange method in which the heat medium of the heat exchanger 30 is heated by the cooling water, rather than a direct heat exchange method in which the cooling water directly flows in the heat exchanger 30.

[0051] As illustrated, the heat exchanger 30 can be provided one, or can be provided two or more. In the case where the heat exchanger 30 is configured as a plurality, the plurality of heat exchangers 30 can be provided in series and / or in parallel, or can be distributed to the main engine El and the auxiliary engine E2, respectively.

[0052] Hereinafter, a booster pump 41, a backup heater 42, and a gas separator 43 provided on the side of the heat exchanger 30 (first cooling water circulation flow path L20a) on the cooling water circulation flow path L20 will be described.

[0053] The booster pump 41 pumps the cooling water at a high temperature discharged from the main engine El to the heat exchanger 30. The booster pump 41 can be disposed upstream of the heat exchanger 30 in the cooling water circulation flow path L20, and can have a function similar to that of the aforementioned cooling water pump 21.

[0054] In order to minimize the pressure difference between the liquefied gas and the cooling water in the heat exchanger 30, the booster pump 41 can pressurize the cooling water corresponding to the pressure of the liquefied gas flowing into the heat exchanger 30. In this case, the discharge pressure of the booster pump 41 can be relatively higher than the discharge pressure of the cooling water pump 21.

[0055] As with the cooling water pump 21, the plurality of booster pumps 41 can be provided in parallel or in series, and in the case where the booster pumps 41 are provided in parallel, the cooling water is pumped by the plurality of booster pumps 41 at the same time, so that the load of each booster pump 41 can be shared.

[0056] The backup heater 42 can heat at least a portion of the cooling water transferred to the heat exchanger 30. The backup heater 42 heats the cooling water using an additional heat source, so that the cooling water can have a sufficient temperature to heat the liquefied gas in the heat exchanger 30. At this time, the heat source can be sea water, fresh water, steam, etc., but is not limited thereto.

[0057] The backup heater 42 can be used to cope with a situation in which the load of the main engine E1 decreases and the temperature of the cooling water decreases, so that the amount of heat required to sufficiently heat the liquefied gas in the heat exchanger 30 is insufficient, or a situation in which the temperature of the cooling water decreases due to the temperature of the outside air, or a situation in which the cooling water cannot be heated due to the stop of the main engine E1, etc.

[0058] The backup heater 42 can be disposed downstream of the booster pump 41 in the cooling water circulation flow path L20, but the position of the backup heater 42 is not limited thereto, and can be disposed on the first branch flow path L21 described later.

[0059] The gas separator 43 separates gas that can be contained in the low-temperature cooling water discharged from the heat exchanger 30. The gas separator 43 can be disposed downstream of the heat exchanger 30 in the cooling water circulation flow path L20, and in the event that gas leaks from the heat exchanger 30 and mixes into the cooling water, it can be sensed and separated. To this end, the gas separator 43 can be provided with a gas sensor (not shown), and the gas separated from the gas separator 43 is explosive, so that it can be safely discharged to the outside through the exhaust flow path L25.

[0060] In the case where the gas separator 43 senses that gas is mixed into the cooling water, in order to prevent the liquefied gas from being further leaked, the supply of the liquefied gas to the heat exchanger 30 can be blocked, and the engines E1, E2 can be stopped from operating or switched to a mode such as consuming oil fuel other than the liquefied gas. For the latter case, the engines E1, E2 can be dual-fuel engines capable of simultaneously using gas fuel and / or oil fuel.

[0061] The gas separator 43 can be disposed between the heat exchanger 30 and the booster pump 41 in the cooling water circulation flow path L20, and can have a container form that stores the cooling water. Thereby, the gas separator 43 can have a partial expansion function in the cooling water circulation flow path L20.

[0062] Next, the cooling water circulation flow path L20 and the first branch flow path L21 and the second branch flow path L22 will be described.

[0063] The cooling water circulation flow path L20 is provided to circulate the cooling water supplied to the main engine El and the heat exchanger 30, which is cooled to a low temperature while exchanging heat with the liquefied gas in the heat exchanger 30 after being discharged from the main engine El at a high temperature, and can be circulated to the main engine El again.

[0064] At this time, the first branch flow path L21 is provided in the cooling water circulation flow path L20 to connect between the upstream and the downstream of the heat exchanger 30 by connecting both ends of the first cooling water circulation flow path L20a, so that the cooling water bypasses the main engine El and circulates through the heat exchanger 30.

[0065] In addition, the second branch flow path L22 is provided in the cooling water circulation flow path L20 to connect between the upstream and the downstream of the main engine El by connecting both ends of the second cooling water circulation flow path L20b in the cooling water circulation flow path L20, so that the cooling water bypasses the heat exchanger 30 and circulates through the main engine El.

[0066] At this time, the first branch flow path L21 and the second branch flow path L22 can constitute a first closed loop and a second closed loop, which are independently provided, together with the first cooling water circulation flow path L20a and the second cooling water circulation flow path L20b. According to the above-described configuration, the cooling water can be circulated along three kinds of closed loops.

[0067] Specifically, the cooling water can be circulated along the entire cooling water circulation flow path L20 and pass through the heat exchanger 30 and the main engine El, or circulated along the first cooling water circulation flow path L20a and the first branch flow path L21 and bypass the main engine El and pass through the heat exchanger 30, or circulated along the second cooling water circulation flow path L20b and the second branch flow path L22 and bypass the heat exchanger 30 and pass through the main engine El.

[0068] In the case where the operation of the main engine El and the heat exchanger 30 is not problematic, the first branch flow path L21 and the second branch flow path L22 can be completely closed, and the cooling water can be circulated along the entire cooling water circulation flow path L20. Therefore, the cooling water repeatedly undergoes a process of being heated in the main engine El and being cooled in the heat exchanger 30.

[0069] In particular, in this case, the cooling water can be heated to a sufficient temperature by the main engine El operated at a normal load, and thus additional heating based on the backup heater 42 can not be required. Therefore, a heater bypass flow path can be provided in the cooling water circulation flow path L20 to bypass the backup heater 42 when the cooling water is supplied to the heat exchanger 30 through the cooling water circulation flow path L20 via the main engine El.

[0070] However, in the case where the load of the main engine El falls below the preset value, sufficient heating of the cooling water can not be achieved in the main engine El, and therefore, in this case, the heater bypass flow path is blocked and the backup heater 42 can be used.

[0071] On the other hand, as in the case where the main engine El is stopped, in the case where the cooling water cannot be circulated through the main engine El or the necessity of circulation is low, the present application opens the first branch flow path L21, thereby causing the cooling water to circulate in a first closed loop formed along the first cooling water circulation flow path L20a and the first branch flow path L21.

[0072] At this time, a valve (not labeled) capable of blocking the flow of the cooling water is provided downstream of the branching point of the first branch flow path L21 and upstream of the merging point of the first branch flow path L21 in the cooling water circulation flow path L20, whereby the cooling water can be caused to circulate in the first closed loop.

[0073] A booster pump 41, a backup heater 42, a heat exchanger 30, and a gas separator 43 are provided on the first closed loop, and the cooling water is supplied to the heat exchanger 30 after being heated in the backup heater 42. Therefore, in the present application, even in the case where the cooling water cannot be circulated through the main engine El or the necessity of circulation is low, stable heating of the liquefied gas in the heat exchanger 30 can be ensured.

[0074] Thus, in the system of the present application in which the main engine El and the auxiliary engine E2 share one heat exchanger 30, even if a problem occurs in the heating of the cooling water based on the main engine El, stable operation of the auxiliary engine E2 can be achieved.

[0075] On the other hand, as in the case where gas leakage is sensed in the gas separator 43 or the heat exchanger 30 is not suitable for use because of the supply of a fuel other than the liquefied gas to the engines El, E2, the present application opens the second branch flow path L22, thereby causing the cooling water to circulate in a second closed loop formed along the second cooling water circulation flow path L20b and the second branch flow path L22.

[0076] At this time, as described above, the cooling water can be caused to circulate in the second closed loop due to the operation of the valve provided upstream of the branching point of the second branch flow path L22 and upstream of the merging point of the second branch flow path L22 in the cooling water circulation flow path L20.

[0077] For reference, the valve provided downstream of the branching point of the first branch flow path L21 in the cooling water circulation flow path L20 can be the valve provided upstream of the merging point of the second branch flow path L22 in the cooling water circulation flow path L20, and the valve provided upstream of the merging point of the first branch flow path L21 in the cooling water circulation flow path L20 can be the valve provided downstream of the branching point of the second branch flow path L22 in the cooling water circulation flow path L20.

[0078] Of course, the present application is not limited to the configuration of the valve as explained above, and a 2-way valve and / or a 3-way valve, etc. can be appropriately used.

[0079] A cooling water pump 21, a cooling water cooler 22, and a clean water generator 23 are provided on the second closed loop, and the cooling water, after being heated in the main engine El, can be cooled in the cooling water cooler 22. Thus, in the present application, in the case where the cooling water is not or cannot be transmitted to the heat exchanger 30, the cooling water supply to the main engine El can be ensured, and thus the stable operation of the main engine El can be maintained.

[0080] Expansion tanks 44a, 44b are connected to the cooling water circulation flow path L20. The expansion tanks 44a, 44b can be provided to adjust the pressure of the cooling water flowing along the entire cooling water circulation flow path L20.

[0081] The expansion tanks 44a, 44b are provided in plural, and are connected to each of the first and second closed loops formed by the first branch flow path L21 and the second branch flow path L22, whereby the cooling water pressure adjustment in the first and second closed loops is achieved, and thus the overpressure in the first and second closed loops can be prevented. Alternatively, one expansion tank 44a, 44b can be connected to the first and second closed loops in common.

[0082] In the former case, the expansion tanks 44a, 44b can be provided to be connected to the first and second cooling water circulation flow paths L20a, L20b, respectively. At this time, the expansion tank 44a connected to the first cooling water circulation flow path L20a can be provided downstream of the gas separator 43 in the cooling water circulation flow path L20, and the cooling water passing through the gas separator 43 can flow without passing through the expansion tank 44a due to the branch connection from the cooling water circulation flow path L20. However, if the pressure of the cooling water becomes high downstream of the gas separator 43, the cooling water is naturally transmitted to the expansion tank 44a, and thus the pressure can be reduced by the expansion tank 44a.

[0083] On the other hand, the expansion tank 44b connected to the second cooling water circulation flow path L20b can be provided to be connected between the cooling water cooler 22 and the cooling water pump 21, and is branched from the cooling water circulation flow path L20, whereby the cooling water cooled in the cooling water cooler 22 can flow into the cooling water pump 21 bypassing the expansion tank 44b. However, if the overpressure occurs in the second closed loop, the cooling water is transmitted to the expansion tank 44b, and thus the inflow pressure of the cooling water pump 21 can be maintained at an appropriate level.

[0084] Expansion tanks 44a and 44b can be branched onto the cooling water circulation path L20 or the first branch path L21 and the second branch path L22, or they can be installed on the cooling water circulation path L20 or the first branch path L21 and the second branch path L22. Furthermore, expansion tanks 44a and 44b are not necessarily limited to a container shape; they can include all shapes that achieve a buffering function, such as those where a portion of the flow path is expanded.

[0085] With the expansion tanks 44a and 44b as described above, the present invention can ensure overpressure protection during cooling water flow in both cases where the cooling water circulates only in the first closed loop or only in the second closed loop.

[0086] Additionally, a heat exchanger bypass flow path L24 can be provided in the cooling water circulation path L20 upstream of the heat exchanger 30, bypassing the heat exchanger 30. Therefore, at least a portion of the cooling water can bypass the heat exchanger 30 without being cooled by the liquefied gas, and thus can be used to regulate the temperature of the cooling water downstream of the heat exchanger 30.

[0087] The flow to the heat exchanger bypass path L24 can be controlled based on variables such as the flow rate or temperature of the liquefied gas, and the flow rate and temperature of the cooling water. For example, when the temperature of the liquefied gas is high, to prevent overheating, a portion of the cooling water can bypass the heat exchanger through the bypass path L24. Conversely, if the temperature of the liquefied gas is sensed to be low, the flow of cooling water to the bypass path L24 can be blocked.

[0088] The flow of various cooling waters shown in this embodiment will be described below. First, as... Figure 1 As shown, the flow of cooling water along the cooling water circulation path L20 is explained.

[0089] Reference Figure 1 As mentioned above, the cooling water circulation path L20 forms a closed loop connecting the main engine E1 and the heat exchanger 30, thereby allowing the high-temperature cooling water discharged from the main engine E1 to be transferred to the heat exchanger 30 via the cooling water circulation path L20. Then, the low-temperature cooling water discharged from the heat exchanger 30 can flow into the cooling water cooler 22 after passing through the gas separator 43 and the like along the cooling water circulation path L20.

[0090] According to this flow, cooling water flows into the cooling water cooler 22, the cooling water pump 21 and the main engine E1 along the cooling water circulation path L20, and at least a portion of the cooling water can be transferred back to the cooling water cooler 22 after flowing along the cooling water circulation path L20 downstream of the main engine E1 through the booster pump 41, the standby heater 42 (if needed), the heat exchanger 30 and the gas separator 43.

[0091] This flow can be achieved when the main engine E1 is running normally and the cooling water is sufficiently heated in the main engine E1. That is, in this embodiment, the high-temperature cooling water, which is heated simultaneously with the main engine E1, is transferred to the heat exchanger 30 along the cooling water circulation path L20, thereby transferring the waste heat of the cooling water to the liquefied gas in the heat exchanger 30.

[0092] To adequately heat the cooling water, the load on the main engine E1 needs to be above a preset value. That is, when the load on the main engine E1 is above the preset value (or the ship's speed is above a preset speed), the cooling water can circulate along the entire cooling water circulation path L20. In this case, the cooling water can be adequately heated in the main engine E1, and therefore, in the cooling water circulation path L20, the cooling water can at least partially bypass the standby heater 42 and flow into the heat exchanger 30 through the heater bypass path.

[0093] On the other hand, if the load on the main engine E1 is less than the preset value (the ship speed is less than the preset speed), the cooling water may not be sufficiently heated even if it passes through the main engine E1. Therefore, in this case, the cooling water circulates along the cooling water circulation path L20 in a similar manner to the previous case, but the cooling water flowing in the cooling water circulation path L20 can flow into the heat exchanger 30 after being further heated by the standby heater 42.

[0094] The following, such as Figure 2 As shown, the flow of cooling water along the first closed loop formed by the cooling water circulation path L20 and the first branch path L21 will be explained.

[0095] Reference Figure 2 When the main engine E1 is stopped for the purpose of mooring the ship, there may be no cooling water flow in the cooling water circulation path L20. At this time, the first branch path L21 is opened according to the valve adjustment, so that the cooling water flows along the first closed loop formed by the first cooling water circulation path L20a and the first branch path L21.

[0096] However, in this case, the cooling water is not heated by the main engine E1, so the backup heater 42 can be used. That is, the cooling water is heated by the backup heater 42 while circulating along the first cooling water circulation path L20a and the first branch path L21, and then it can flow into the heat exchanger 30.

[0097] In this case as well, as described above, the pressure of the cooling water can be regulated using the expansion tanks 44a, 44b provided downstream of the gas separator 43 and the like in the cooling water circulation flow path L20, and thus the heat exchanger 30 can stably heat the liquefied gas by the cooling water without using the waste heat of the main engine El.

[0098] As described above, in the present embodiment, the liquefied gas supplied to the engines El, E2 is heated by the cooling water of the main engine El, the flow of the cooling water is controlled in accordance with the load of the main engine El, and the operation or not, and the backup heater 42 is appropriately used, and thus by the stable heating of the liquefied gas, it is possible to ensure the operation stability of the power generation engine.

[0099] The present application has been described in detail by way of specific embodiments, but this is merely for the purpose of specifically illustrating the present application, and the present application is not limited thereto, and a person skilled in the art can make modifications or improvements within the scope of the technical idea of the present application.

[0100] Simple modifications or changes of the present application are within the scope of the present application, and the specific scope of protection of the present application will be more apparent from the appended claims. CLAIM

Claims

1. A gas treatment system, wherein, Comprising: a first fuel supply flow path that supplies fuel to a main engine; a second fuel supply flow path that branches from the first fuel supply flow path and supplies fuel to an auxiliary engine; a heat exchanger that is provided in the first fuel supply flow path and heats the fuel; and a cooling water circulation flow path of the main engine that is provided to supply a heat source to the heat exchanger, the cooling water circulation flow path being configured to be able to be separated into a first cooling water circulation flow path that circulates through the heat exchanger and a second cooling water circulation flow path that circulates through the main engine. Further comprising:

2. The gas treatment system of claim 1, wherein, a first branch flow path that connects both ends of the first cooling water circulation flow path to circulate cooling water through the heat exchanger while bypassing the main engine; and a second branch flow path that connects both ends of the second cooling water circulation flow path to circulate cooling water through the main engine while bypassing the heat exchanger.

3. The gas handling system according to claim 2, wherein a backup heater is provided in the first cooling water circulation flow path or the first branch flow path, the backup heater heats and supplies cooling water to the heat exchanger in a case where a load of the main engine is less than a predetermined value or cooling water bypasses the main engine by means of the first branch flow path.

4. The gas handling system according to claim 3, wherein a bypass flow path is further provided to bypass the backup heater in a case where cooling water is supplied to the heat exchanger via the main engine by means of the cooling water circulation flow path.

5. The gas handling system according to claim 2, wherein the first branch flow path circulates cooling water through the heat exchanger while bypassing the main engine in a case where the main engine is stopped.

6. The gas handling system according to claim 2, wherein cooling water passes through the heat exchanger and the main engine in a case where it circulates along the entire cooling water circulation flow path, or bypasses the main engine and passes through the heat exchanger in a case where it circulates along the first cooling water circulation flow path and the first branch flow path, or bypasses the heat exchanger and passes through the main engine in a case where it circulates along the second cooling water circulation flow path and the second branch flow path.

7. The gas handling system according to claim 6, wherein a first closed loop formed by the first cooling water circulation flow path and the first branch flow path is provided to be independent of a second closed loop formed by the second cooling water circulation flow path and the second branch flow path.

8. The gas handling system according to claim 7, wherein an expansion tank is further provided to adjust a pressure of cooling water that flows along the first closed loop or the second closed loop.

9. A ship having the gas handling system according to any one of claims 1 to 8. ​

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