Waste heat recovery system in ship

Abstract

The present invention relates to a waste heat recovery system in a ship. The waste heat recovery system may comprise: a first heat exchanger that heats a fluid by using high-temperature air discharged from a turbocharger; an organic Rankine cycle that generates electricity by using the fluid heated in the first heat exchanger; a first circulation line in which the first heat exchanger and the organic Rankine cycle are arranged and through which the fluid circulates; a second heat exchanger that heats a fluid by using exhaust gas; a fluid cooling unit that cools the fluid heated in the second heat exchanger; a second circulation line in which the second heat exchanger and the fluid cooling unit are arranged and through which the fluid circulates; a first connection line through which the fluid in the second circulation line is supplied to the first circulation line; and a second connection line through which the fluid in the first circulation line is supplied to the second circulation line.

Description

Ship's waste heat recovery system

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2025-0040345 filed on March 28, 2025, and all contents disclosed in the document of said Korean Patent Application are incorporated herein as part of this specification.

[0003] Technology field

[0004] The present invention relates to a waste heat recovery system for a ship, and more specifically, to a waste heat recovery system capable of recovering a plurality of waste heats within a ship into a single organic Rankine cycle through an integrated hot water line.

[0005] Ships are equipped with systems that utilize waste heat to supply heat to other heat-consuming points within the vessel. For example, an economizer generates high-temperature steam through heat exchange with high-temperature exhaust gases emitted from the engine, which can then be supplied to various heat-consuming points on board.

[0006] In addition to engine exhaust gases, ships generate various types of waste heat, such as waste heat from air heated by turbochargers and waste heat from cooling water heated while cooling the engines. Conventionally, when the amount of waste heat was small, waste heat recovery was often not performed because the cost savings were not significant when considering the equipment costs and space efficiency required for recovery.

[0007] However, as the number of ships using eco-friendly fuels increases, fuel costs are continuously rising; consequently, the potential for cost savings is growing as even small amounts of waste heat are recovered to reduce fuel consumption.

[0008] Referring to FIG. 1, a conventional waste heat recovery system (100) installed an organic Rankine cycle suitable for the size of each waste heat source to recover waste heat from a plurality of waste heat sources, and thus there was a problem of increased development costs and equipment costs of the conventional waste heat recovery system (100).

[0009] Therefore, the present invention aims to provide a waste heat management system for a ship that can recover the waste heat from the exhaust gas of the ship's engine and the waste heat from the high-temperature air passing through the turbocharger into a single organic Rankine cycle.

[0010] A waste heat recovery system for a ship according to one embodiment of the present invention comprises: a first heat exchanger that heats a fluid through heat exchange with high-temperature compressed air discharged from the turbocharger; an Organic Rankine Cycle (ORC) that receives the fluid passing through the first heat exchanger and produces electricity; a first circulation line in which the first heat exchanger and the Organic Rankine Cycle are arranged and the fluid circulates; a second heat exchanger that heats a fluid through heat exchange with high-temperature exhaust gas; a fluid cooling unit capable of maintaining the temperature of the fluid flowing into the second heat exchanger or the temperature of the fluid discharged from the second heat exchanger within a certain temperature range by cooling the fluid passing through the second heat exchanger; and a second circulation line in which the second heat exchanger and the fluid cooling unit are arranged and the fluid circulates. It may include a first connecting line branched from the second circulation line at the downstream end of the second heat exchanger and connected to the first circulation line at the downstream end of the first heat exchanger, thereby supplying fluid of the second circulation line to the first circulation line; and a second connecting line branched from the first circulation line at the downstream end of the organic Rankine cycle and connected to the second circulation line, thereby supplying fluid of the first circulation line to the second circulation line.

[0011] In one example, a temperature sensor is provided at the front or rear end of the second heat exchanger, and the fluid cooling unit includes a fluid cooling line that branches off from the second circulation line and is connected back to the second circulation line; and a cooler that is placed in the fluid cooling line to cool the fluid, and the amount of fluid branched off to the fluid cooling line or the amount of refrigerant supplied to the cooler can be controlled according to the temperature measured by the temperature sensor.

[0012] In one example, a temperature sensor is provided at the front or rear end of the second heat exchanger, and the fluid cooling unit includes a cooler that is placed on the second circulation line to cool the fluid, and the amount of refrigerant supplied to the cooler can be controlled according to the temperature measured by the temperature sensor.

[0013] In one example, a first bypass line is provided that branches off from the first circulation line at the front end of the organic Rankine cycle and connects to the first circulation line at the rear end of the organic Rankine cycle, and at least a portion of the fluid at the front end of the organic Rankine cycle can be bypassed to the rear end of the organic Rankine cycle through the first bypass line without passing through the organic Rankine cycle.

[0014] In one example, at the downstream end of the first heat exchanger, there is a scavenger cooler in which air passing through the first heat exchanger is cooled by heat exchange with a low-temperature fluid; a fluid supply line in which a low-temperature fluid is supplied to the scavenger cooler; a fluid discharge line in which a fluid heated by heat exchange with air in the scavenger cooler is discharged; a third connecting line branched from the fluid supply line and connected to the first circulation line or the second circulation line; and a fourth connecting line branched from the first circulation line or the second circulation line and connected to the fluid discharge line; wherein at least a portion of the fluid on the fluid supply line may be supplied to the first circulation line or the second circulation line along the third connecting line, and at least a portion of the fluid on the first circulation line or the second circulation line may be supplied to the fluid discharge line along the fourth connecting line.

[0015] In one example, the system includes a fifth connection line that branches off from the third connection line and connects to the fourth connection line, and at least a portion of the fluid supplied to the first circulation line or the second circulation line along the third connection line may be supplied to the fourth connection line along the fifth connection line.

[0016] A waste heat recovery system for a ship according to one embodiment of the present invention comprises: a ship including an engine that discharges exhaust gas and a turbocharger that compresses air by the exhaust gas; a first heat exchanger that heats a fluid through heat exchange with high-temperature compressed air discharged from the turbocharger; a fluid cooling unit capable of maintaining the temperature of a fluid flowing into the first heat exchanger or the temperature of a fluid discharged from the first heat exchanger within a certain temperature range by cooling the fluid that has passed through the first heat exchanger; a first circulation line in which the first heat exchanger and the fluid cooling unit are arranged and the fluid circulates; a second heat exchanger that heats a fluid through heat exchange with high-temperature exhaust gas; an Organic Rankine Cycle (ORC) that receives the fluid that has passed through the second heat exchanger and produces electricity; and a second circulation line in which the second heat exchanger and the Organic Rankine Cycle are arranged and the fluid circulates. It may include a first connecting line branched from the first circulation line at the downstream end of the first heat exchanger and connected to the second circulation line at the downstream end of the second heat exchanger, thereby supplying fluid of the first circulation line to the second circulation line; and a second connecting line branched from the second circulation line at the downstream end of the organic Rankine cycle and connected to the first circulation line, thereby supplying fluid of the second circulation line to the first circulation line.

[0017] The waste heat recovery system of the present invention can reduce costs by recovering multiple waste heats with a single organic Rankine cycle by integrating a line through which an intermediate heat transfer medium flows to exchange heat with the waste heat of exhaust gas from a ship's engine and the waste heat of high-temperature air that has passed through a turbocharger.

[0018] Figure 1 is a diagram showing a conventional ship waste heat utilization system.

[0019] Figure 2 is a diagram showing the waste heat utilization system of a ship according to the present invention.

[0020] FIG. 3 is a diagram showing another embodiment of the waste heat utilization system of a ship according to the present invention.

[0021] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0022] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by these terms. Where it is stated that a component is "connected," "combined," or "joined" to another component, it should be understood that the component may be directly connected or joined to the other component, but that another component may also be "connected," "combined," or "joined" between each component.

[0023] In this specification, the front-back, left-right, and up-down directions are referred to for convenience of explanation and may be directions orthogonal to one another. However, these directions are determined relatively, and the term "up-down direction" does not necessarily mean a vertical direction.

[0024]

[0025] Referring to FIG. 2, the waste heat recovery system (1) of the ship according to the present invention comprises: a first heat exchanger (30) that heats a fluid through heat exchange with high-temperature compressed air discharged from the turbocharger (20); an organic Rankine cycle (60) that produces electricity by receiving the fluid that has passed through the first heat exchanger (30); a first circulation line (L1) in which the first heat exchanger (30) and the organic Rankine cycle (60) are arranged and the fluid circulates; a second heat exchanger (50) that heats a fluid through heat exchange with high-temperature exhaust gas; and a fluid cooling unit (70) that can maintain the temperature of the fluid flowing into the second heat exchanger (50) or the temperature of the fluid discharged from the second heat exchanger (50) within a certain temperature range by cooling the fluid that has passed through the second heat exchanger (50). It may include a second circulation line (L2) in which a second heat exchanger (50) and a fluid cooling unit (70) are arranged and a fluid circulates; a first connection line (CL1) which branches off from the second circulation line (L2) at the rear end of the second heat exchanger (50) and is connected to the first circulation line (L1) at the rear end of the first heat exchanger (30), thereby supplying the fluid of the second circulation line (L2) to the first circulation line (L1); and a second connection line (CL2) which branches off from the first circulation line (L1) at the rear end of the organic Rankine cycle (60) and is connected to the second circulation line (L20), thereby supplying the fluid of the first circulation line (L1) to the second circulation line (L2).

[0026] The engine (10) can emit exhaust gas as the supplied fuel burns. The high-temperature exhaust gas may be discharged directly to the outside through the turbocharger (20), but it may also be supplied to a second heat exchanger (50) to utilize waste heat, where it is heat-exchanged with a fluid before being discharged.

[0027] That is, the exhaust gas passing through the second heat exchanger (50) has its temperature lowered and the temperature of the fluid rises, so that it can act as an intermediate heat medium to store the waste heat of the exhaust gas. For example, the fluid passing through the second heat exchanger (50) can be heated to a temperature of 70 to 130 degrees. At this time, the fluid may be water, but is not limited thereto, and may be another fluid that can act as an intermediate heat medium (e.g., glycol water).

[0028] Additionally, in the turbocharger (20), air can be compressed and heated by exhaust gas. The compressed air can be supplied back to the engine (10) to increase the efficiency of the engine (10).

[0029] At this time, before the air heated through the turbocharger (20) is supplied to the engine (10), it may be heat exchanged with the fluid by passing through the first heat exchanger (30) to utilize waste heat.

[0030] That is, the air passing through the first heat exchanger (30) has its temperature lowered, and the temperature of the fluid rises, so that it can act as an intermediate heat medium to store the waste heat of the air passing through the turbocharger (20). For example, the fluid passing through the first heat exchanger (30) can be heated to a temperature of 70 to 95 degrees. Typically, since the temperature of the exhaust gas is higher than the temperature of the air passing through the turbocharger (20), the temperatures of the fluids in the first circulation line (L1) and the second circulation line (L2) may not be the same.

[0031] The fluid passing through the first heat exchanger (30) can be supplied to the organic Rankine cycle (60) along the first circulation line (L1). However, at the front end of the organic Rankine cycle (60), the fluid passing through the first heat exchanger (30) can be combined with the fluid passing through the second heat exchanger (50), and this will be explained in detail below.

[0032] The fluid that has passed through the second heat exchanger (50) can flow along the second circulation line (L2) and then branch off to the first connection line (CL1) and can be supplied to the first circulation line (L1) at the rear end of the first heat exchanger (30). That is, at the rear end of the first heat exchanger (30), the fluid that has passed through the first heat exchanger (30) and the fluid that has passed through the second heat exchanger (50), that is, the fluid that has recovered waste heat from different waste heat sources, can be combined.

[0033] At this time, a control valve or a three-way valve may be provided in the first connection line (CL1) to regulate the amount of fluid supplied to the first circulation line (L1). For example, the amount of fluid flowing into the first circulation line (L1) may be controlled to a level that the organic Rankine cycle (60) can accommodate by adjusting the opening of the valve, or the first circulation line (L1) and the second circulation line (L2) may be operated separately by closing the valve.

[0034] The fluid combined at the first circulation line (L1) downstream of the first heat exchanger (30) can be supplied to the organic Rankine cycle (60) along the first circulation line (L1) to produce electricity. The fluid supplied to the first circulation line (L1) through the first connection line (CL1) after passing through the second heat exchanger (50) and the fluid flowing along the first circulation line (L1) after passing through the first heat exchanger (30) can be combined and supplied to the organic Rankine cycle (60). That is, since multiple waste heat recovered from different waste heat sources can be integrated in one organic Rankine cycle (60) to produce electricity, costs can be reduced.

[0035] As the fluid passes through the organic Rankine cycle (60) and electricity is produced, the temperature of the fluid decreases, and the fluid with the lowered temperature returns to the first heat exchanger (30) along the first circulation line (L1) and can exchange heat with the air that has passed through the turbocharger (20).

[0036] However, since fluid has been supplied from the second circulation line (L2) to the first circulation line (L1) along the first connection line (CL1) as described above, it is necessary to supply the fluid that has completed heat exchange in the organic Rankine cycle (60) back to the second circulation line (L2) to regulate the flow rate of each circulation line (L1, L2).

[0037] Accordingly, the fluid that has passed through the organic Rankine cycle (60) can be supplied to the second circulation line (L2) along the second connection line (CL2). That is, the fluid supplied to the second circulation line (L2) along the second connection line (CL2) can be combined with the fluid flowing along the second circulation line (L2). At this time, a control valve or a three-way valve may be provided in the second connection line (CL2) to regulate the amount of fluid supplied to the second circulation line (L2). In addition, the second connection line (CL2) can be connected to the second circulation line (L2) at the front or rear end of the fluid cooling unit (70) to be described later.

[0038] The fluid combined in the second circulation line (L2) can be supplied back to the second heat exchanger (50) along the second circulation line (L2). However, in order to efficiently recover waste heat in the second heat exchanger (50), the temperature of the fluid supplied to the second heat exchanger (50) may be maintained within a certain temperature range. Alternatively, the temperature of the fluid discharged from the second heat exchanger (50) may be maintained within a certain temperature range.

[0039] The fluid cooling unit (70) can measure the temperature of the fluid flowing into the second heat exchanger (50) or the temperature of the fluid discharged from the second heat exchanger (50), and cool the fluid flowing along the second circulation line (L2) so that the measured temperature is maintained within the target temperature range.

[0040] More specifically, referring to FIG. 2, a temperature sensor (90) is provided at the front or rear end of the second heat exchanger (50), and the fluid cooling unit (70) includes a fluid cooling line (L3) that branches off from the second circulation line (L2) and is connected back to the second circulation line (L2); and a cooler (80) that cools the fluid and is placed in the fluid cooling line (L3), and the amount of fluid branched off to the fluid cooling line (L3) or the amount of refrigerant supplied to the cooler (80) can be controlled according to the temperature measured by the temperature sensor (90).

[0041] In order to maintain the temperature of the fluid measured by the temperature sensor (90) within a constant temperature range, a portion of the fluid flowing along the second circulation line (L2) may be branched into the fluid cooling line (L3) and pass through the cooler (80).

[0042] At this time, the amount of fluid passing through the cooler (80) can be controlled by branching into the fluid cooling line (L3), or the degree of cooling of the fluid can be controlled by varying the degree of operation of the cooler (80). The degree of operation can be controlled, for example, by controlling the temperature and amount of the refrigerant supplied to the cooler (80), or by controlling the power supplied to the cooler (80).

[0043] In another embodiment, unlike as shown in FIG. 2, a fluid cooling line (L3) is not separately provided, and the fluid cooling unit (70) includes a cooler (80) that cools the fluid and is placed on the second circulation line (L2), and the amount of refrigerant supplied to the cooler (80) can be adjusted according to the temperature measured by the temperature sensor (90). Alternatively, the temperature of the refrigerant may be adjusted or the power supplied to the cooler (80) may be adjusted.

[0044] Additionally, although not shown in the drawing, the fluid cooling unit (70) may be provided in the first circulation line (L1) as needed to control the temperature of the fluid supplied to the first heat exchanger (30) along the first circulation line (L1). For example, a temperature sensor (90) may be provided at the front or rear end of the first heat exchanger (30), and the temperature of the fluid may be controlled through a cooler (80).

[0045] Additionally, the fluid cooling unit (70) may serve to cool the fluid in the second circulation line (L2) when the organic Rankine cycle (60) is not in operation, thereby preventing the fluid from boiling.

[0046] Referring to FIG. 2, the waste heat recovery system (1) of the ship of the present invention is provided with a first bypass line (BL1) that branches off from a first circulation line (L1) upstream of an organic Rankine cycle (60) and connects to a first circulation line (L1) downstream of an organic Rankine cycle (60), and at least a portion of the fluid upstream of the organic Rankine cycle (60) can be bypassed to the downstream of the organic Rankine cycle (60) through the first bypass line (BL1) without passing through the organic Rankine cycle (60).

[0047] If the fluid combined at the front end of the organic Rankine cycle (60) exceeds the amount of heat that the organic Rankine cycle (60) can accommodate, a portion of the fluid may be diverted to the rear end of the organic Rankine cycle (60) through the first bypass line (BL1).

[0048] At this time, a control valve or a three-way valve may be provided in the first bypass line (BL1) to control the amount of fluid bypassing the organic Rankine cycle (60). For example, if the organic Rankine cycle (60) is not in use due to a malfunction or inspection, the opening of the valve may be adjusted so that the fluid bypasses the organic Rankine cycle (60).

[0049] Referring to FIG. 2, the waste heat recovery system (1) of the ship of the present invention is provided with a second bypass line (BL2) that branches off from a second circulation line (L2) upstream of a second heat exchanger (50) and connects to a second circulation line (L2) downstream of the second heat exchanger (50), and at least a portion of the fluid upstream of the second heat exchanger (50) can be bypassed to the downstream of the second heat exchanger (50) through the second bypass line (BL2) without passing through the second heat exchanger (50).

[0050] In cases where the second heat exchanger (50) is being repaired, the engine (10) is not running, or there is a need to adjust the amount of heat exchanged in the second heat exchanger (50), the fluid flowing along the second circulation line (L2) upstream of the second heat exchanger (50) may not be supplied to the second heat exchanger (50) and may be diverted along the second bypass line (BL2).

[0051] At this time, a control valve or a three-way valve may be provided in the second bypass line (BL2) to control the amount of fluid bypassing the second heat exchanger (50). For example, when inspecting the second heat exchanger (50), the opening of the valve may be adjusted so that the entire amount of fluid bypasses the second heat exchanger (50) without passing through it.

[0052] Referring to FIG. 3, the waste heat recovery system (1) of the ship according to the present invention comprises, at the downstream end of the first heat exchanger (30), a scavenger cooler (40) in which air passing through the first heat exchanger (30) is cooled by heat exchange with a low-temperature fluid; a fluid supply line (L4) through which a low-temperature fluid is supplied to the scavenger cooler (40); a fluid discharge line (L5) through which a fluid heated by heat exchange with air in the scavenger cooler (40) is discharged; and a third connecting line (CL3) branched from the fluid supply line (L4) and connected to a first circulation line (L1) or a second circulation line (L2). and a fourth connecting line (CL4) branched from the first circulation line (L1) or the second circulation line (L2) and connected to the fluid discharge line (L5); wherein at least a portion of the fluid on the fluid supply line (L4) can be supplied to the first circulation line (L1) or the second circulation line (L2) along the third connecting line (CL3), and at least a portion of the fluid on the first circulation line (L1) or the second circulation line (L2) can be supplied to the fluid discharge line (L5) along the fourth connecting line (CL4).

[0053] Additionally, it includes a fifth connection line (CL5) that branches off from the third connection line (CL3) and connects to the fourth connection line (CL4), and at least a portion of the fluid supplied to the first circulation line (L1) or the second circulation line (L2) along the third connection line (CL3) can be supplied to the fourth connection line (CL4) along the fifth connection line (CL5).

[0054] The scavenger cooler (40) can cool the air so that the temperature of the engine (10) does not become excessively high when the air compressed and heated in the turbocharger (20) is supplied to the engine (10).

[0055] In the fluid supply line (L4), low-temperature fluid supplied to the scavenger cooler (40) flows, and in the fluid discharge line (L5), fluid that has been heated after cooling the air in the scavenger cooler (40) can flow.

[0056] For example, the scavenger cooler (40) receives low-temperature fresh water (cooling water) from a central cooling system called the FW LT SYSTEM (Fresh Water Low Temperature System) installed in the ship, and can discharge the fresh water, which has been heated through heat exchange, back to the FW LT SYSTEM.

[0057] The fluid flowing along the fluid supply line (L4) may be supplied to the scavenger cooler (40), but may also be supplied to the first circulation line (L1) or the second circulation line (L2) along the first connection line (CL1) to control the temperature of the fluid in the first circulation line (L1) or the second circulation line (L2).

[0058] For example, if the fluid that has passed through the organic Rankine cycle (60) still has a high temperature (above the set temperature), problems may occur in the system (1), such as inefficient recovery of waste heat in the first heat exchanger (30), so the low-temperature fluid of the fluid supply line (L4) can be supplied to the first circulation line (L1) upstream of the first heat exchanger (30) through the third connection line (CL3) to lower the temperature of the fluid in the first circulation line (L1).

[0059] Likewise, if the fluid flowing along the second circulation line (L2) has a high temperature, problems may occur in the system (1), such as inefficient recovery of waste heat in the second heat exchanger (50), so the low-temperature fluid of the fluid supply line (L4) can be supplied to the second circulation line (L2) upstream of the second heat exchanger (50) through the third connection line (CL3) to lower the temperature of the fluid in the second circulation line (L2).

[0060] Additionally, when fluid is supplied to the first circulation line (L1) or the second circulation line (L2) through the third connection line (CL3), the total amount of fluid in the first circulation line (L1) and the second circulation line (L2) increases, so in order to regulate the amount of fluid to a constant level, at least a portion of the fluid in the first circulation line (L1) or the second circulation line (L2) can be discharged to the fluid discharge line (L5) along the fourth connection line (CL4).

[0061] More specifically, a control valve is provided in the third connection line (CL3) to regulate the amount of fluid supplied from the fluid supply line (L4) to the first circulation line (L1) or the second circulation line (L2). Additionally, a three-way valve is provided at the connection point between the fourth connection line (CL4) and the fifth connection line (CL5) to regulate the amount of fluid branched from the third connection line (CL3) to the fourth connection line (CL4) through the fifth connection line (CL5), and the amount of fluid discharged from the first circulation line (L1) or the second circulation line (L2) to the fluid discharge line (L5). Furthermore, the valve may be controlled by the opening and closing or the opening rate by the temperature sensor (90) described above.

[0062] In this way, when the fluid supplied to the scavenger cooler (40) is supplied to the first circulation line (L1) and the second circulation line (L2) to control the temperature, there is no need to provide a separate cooling system such as the cooler (80) and fluid cooling line (L3) described above, thereby having the effect of reducing costs.

[0063]

[0064] A waste heat recovery system (1) of a ship according to another embodiment of the present invention comprises: a first heat exchanger (30) that heats a fluid through heat exchange with high-temperature compressed air discharged from the turbocharger (20); a fluid cooling unit (70) that can maintain the temperature of the fluid flowing into the first heat exchanger (30) or the temperature of the fluid discharged from the first heat exchanger (30) within a certain temperature range by cooling the fluid that has passed through the first heat exchanger (30); a first circulation line (L1) in which the first heat exchanger (30) and the fluid cooling unit (70) are arranged and the fluid circulates; a second heat exchanger (50) that heats the fluid through heat exchange with high-temperature exhaust gas; and an organic Rankine cycle (60) that produces electricity by receiving the fluid that has passed through the second heat exchanger (50). It may include a second circulation line (L2) through which a second heat exchanger (50) and an organic Rankine cycle (60) are arranged and a fluid circulates; a first connection line (CL1) branched from a first circulation line (L1) downstream of the first heat exchanger (30) and connected to a second circulation line (L2) downstream of the second heat exchanger (50), thereby supplying the fluid of the first circulation line (L1) to the second circulation line (L2); and a second connection line (CL2) branched from a second circulation line (L2) downstream of the organic Rankine cycle (60) and connected to a first circulation line (L1), thereby supplying the fluid of the second circulation line (L2) to the first circulation line (L1).

[0065] To explain only the difference from the previous embodiment, in the previous embodiment, fluid was supplied from the second circulation line (L2) that recovers waste heat from exhaust gas through the first connection line (CL1) to the first circulation line (L1) that recovers waste heat from air passing through the turbocharger (20), but in the other embodiment, fluid can be configured to be supplied from the first circulation line (L1) that recovers waste heat from air passing through the turbocharger (20) to the second circulation line (L2) that recovers waste heat from exhaust gas.

[0066]

[0067] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

Claims

1. A ship comprising an engine that emits exhaust gas and a turbocharger that compresses air by means of exhaust gas, A first heat exchanger that heats a fluid through heat exchange with high-temperature compressed air discharged from the turbocharger; Organic Rankine Cycle (ORC) that produces electricity by receiving the fluid that has passed through the first heat exchanger; A first circulation line in which the above-mentioned first heat exchanger and the above-mentioned organic Rankine cycle are arranged and the above-mentioned fluid circulates; A second heat exchanger that heats a fluid through heat exchange with high-temperature exhaust gas; A fluid cooling unit capable of maintaining the temperature of the fluid flowing into the second heat exchanger or the temperature of the fluid discharged from the second heat exchanger within a certain temperature range by cooling the fluid that has passed through the second heat exchanger; A second circulation line in which the above-mentioned second heat exchanger and the above-mentioned fluid cooling unit are arranged and the above-mentioned fluid circulates; A first connecting line branched from the second circulation line at the rear end of the second heat exchanger and connected to the first circulation line at the rear end of the first heat exchanger, thereby supplying fluid from the second circulation line to the first circulation line; and A waste heat recovery system for a ship comprising a second connecting line that branches off from a first circulation line at the downstream end of the organic Rankine cycle and is connected to the second circulation line, thereby supplying the fluid of the first circulation line to the second circulation line.

2. In Claim 1, A temperature sensor is provided at the front or rear end of the second heat exchanger, and The above fluid cooling unit is, A fluid cooling line branched from the second circulation line and connected back to the second circulation line; and It includes a cooler disposed in the above fluid cooling line to cool the fluid, and A waste heat recovery system for a ship in which the amount of fluid branched to the fluid cooling line or the amount of refrigerant supplied to the cooler can be controlled according to the temperature measured by the temperature sensor.

3. In Claim 1, A temperature sensor is provided at the front or rear end of the second heat exchanger, and The above fluid cooling unit is, It includes a cooler disposed on the second circulation line above to cool the fluid, and A waste heat recovery system for a ship in which the amount of refrigerant supplied to the cooler can be controlled according to the temperature measured by the temperature sensor.

4. In Claim 1, A first bypass line is provided that branches off from the first circulation line at the front end of the organic Rankine cycle and connects to the first circulation line at the rear end of the organic Rankine cycle. A waste heat recovery system for a ship in which at least a portion of the fluid upstream of the organic Rankine cycle can be bypassed to downstream of the organic Rankine cycle through the first bypass line without passing through the organic Rankine cycle.

5. In Claim 1, A second bypass line is provided that branches off from the second circulation line upstream of the second heat exchanger and connects to the second circulation line downstream of the second heat exchanger. A waste heat recovery system for a ship in which at least a portion of the fluid upstream of the second heat exchanger can be bypassed to downstream of the second heat exchanger through the second bypass line without passing through the second heat exchanger.

6. In Claim 1, At the downstream end of the first heat exchanger, a scavenger cooler in which air passing through the first heat exchanger is cooled by heat exchange with a low-temperature fluid; A fluid supply line through which a low-temperature fluid is supplied to the above-mentioned scavenger cooler; A fluid discharge line through which the fluid, heated by heat exchange with air in the above scavenger cooler, is discharged; A third connecting line branched from the fluid supply line and connected to the first circulation line or the second circulation line; and A fourth connecting line branched from the first circulation line or the second circulation line and connected to the fluid discharge line; comprising At least a portion of the fluid on the above fluid supply line can be supplied to the first circulation line or the second circulation line along the third connection line, and A waste heat recovery system for a ship in which at least a portion of the fluid on the first circulation line or the second circulation line can be supplied to the fluid discharge line along the fourth connection line.

7. In Claim 6, It includes a fifth connection line that branches off from the third connection line and connects to the fourth connection line, and A waste heat recovery system for a ship in which at least a portion of the fluid supplied to the first circulation line or the second circulation line along the third connection line can be supplied to the fourth connection line along the fifth connection line.

8. A vessel comprising an engine that emits exhaust gas and a turbocharger that compresses air using the exhaust gas, A first heat exchanger that heats a fluid through heat exchange with high-temperature compressed air discharged from the turbocharger; A fluid cooling unit capable of maintaining the temperature of the fluid flowing into the first heat exchanger or the temperature of the fluid discharged from the first heat exchanger within a certain temperature range by cooling the fluid that has passed through the first heat exchanger; A first circulation line in which the first heat exchanger and the fluid cooling unit are arranged and the fluid circulates; A second heat exchanger that heats a fluid through heat exchange with high-temperature exhaust gas; Organic Rankine Cycle (ORC) that produces electricity by receiving the fluid that has passed through the second heat exchanger above; A second circulation line in which the above-mentioned second heat exchanger and the above-mentioned organic Rankine cycle are arranged and the above-mentioned fluid circulates; A first connecting line branched from the first circulation line at the downstream end of the first heat exchanger and connected to the second circulation line at the downstream end of the second heat exchanger, thereby supplying the fluid of the first circulation line to the second circulation line; and A waste heat recovery system for a ship comprising a second connecting line that branches off from a second circulation line at the downstream end of the organic Rankine cycle and is connected to the first circulation line, thereby supplying the fluid of the second circulation line to the first circulation line.

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