Ship waste heat power generation system that utilizes waste heat from ships

Abstract

The present invention relates to a marine waste heat power generation system that utilizes the waste heat of a ship, and in particular to a marine waste heat power generation system that recovers the exhaust gas waste heat and engine cooling water waste heat of a ship that uses various marine fuels such as diesel, dual combustion, and LNG, uses the recovered ship waste heat as a heat source, heats seawater, and generates electricity through an organic Renkin cycle, and combines the exhaust gas waste heat and engine cooling water waste heat, which have different waste heat temperatures, in parallel or series to reduce evaporation calories and improve the efficiency of the organic Renkin cycle.

Description

Technical Field

[0001] The present invention relates to a ship waste heat power generation system using waste heat of ships. In particular, the invention relates to a ship waste heat power generation system using waste heat of ships for recovering exhaust gas waste heat and engine cooling water waste heat from ships using various fuels such as diesel, LNG, and co-combustion, using the recovered ship waste heat as a heat source, taking seawater as cooling heat to generate electricity through an organic Rankine cycle, and increasing the output of the organic Rankine cycle by combining exhaust gas waste heat and engine cooling water waste heat with different waste heat temperatures in parallel or series to increase evaporation calories. Background Art

[0002] The International Maritime Organization (IMO) has set goals through its strategy for reduction of greenhouse gas (GHG) emissions from ships to improve the fuel efficiency of international shipping as a whole by 40% by 2030, achieve a 50% reduction in GHG emissions by 2050, and realize zero GHG emissions within this century. To comply with the IMO's regulations on ship GHG emissions, a shift to carbon-free fuels and electric propulsion systems is unavoidable in the long term, but at the current stage, it is necessary to comply with the regulations through the use of low-carbon fuels such as LNG and the application of technologies for improving ship operation efficiency in the medium term. From this perspective, recycling waste heat generated by internal combustion engines of ships or cryogenic cargo holds can contribute to additional energy savings and improvement of ship operation efficiency. In particular, given that it is difficult to commercialize electric propulsion systems using fuel cells, batteries and the like in large ships in a short period of time from the technical and economic perspectives, ship waste heat utilization technology can be expected as a practical and effective solution for complying with regulations that can be applied to existing ships using internal combustion engines.

[0003] In existing ships, exhaust gases are discharged at a high temperature of 400 degrees Celsius, and steam is produced in an economizer and discharged at around 240 degrees Celsius. However, the existing steam production method has limited use and scope. If this steam is used as a heat source for waste heat power generation on ships, the exhaust temperature can be reduced to around 200 degrees Celsius, and the electricity generated can be used for various power generation equipment, allowing for the additional utilization of waste heat that would otherwise be wasted. On the other hand, engine cooling water is maintained at around 90 degrees Celsius and used as a heat source for evaporative desalination plants. However, evaporative desalination has a low production volume relative to its size, and most of the heat is discharged into seawater. If this waste heat is utilized and switched to additional waste heat power generation on ships, energy recovery can be enhanced.

[0004] Furthermore, in order to reduce greenhouse gases generated during ship operations, ship fuels are being switched from existing diesels to low-carbon fuels such as LNG and ammonia, and the number of LNG-fueled ships, which have a low sulfur content, is increasing. Since LNG-fueled ships do not experience the low-temperature corrosion that occurs below 150 degrees Celsius, it is possible to apply ship-based waste heat power generation equipment that utilizes large amounts of waste heat, thereby reducing greenhouse gases generated during ship operations. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Korean Patent Publication No. 2012-0110709 (Title of Invention: Organic Rankine Cycle Power Generation System Utilizing Waste Heat) [Overview of the project] [Problems that the invention aims to solve]

[0006] Therefore, the present invention has been made in consideration of the above circumstances, and the object of the present invention is to provide a ship waste heat power generation system that can increase the energy recovery rate of waste heat discarded from ships that use a variety of ship fuels.

[0007] Another object of the present invention is to provide a ship-based waste heat power generation system that utilizes the waste heat of a ship, which can improve the output of an organic Rankine cycle by increasing the amount of heat of vaporization by combining exhaust gas waste heat and engine cooling water waste heat, which have different waste heat temperatures, in parallel or in series. [Means for solving the problem]

[0008] To achieve the above objective, a ship waste heat power generation system utilizing the waste heat of a ship according to an embodiment of the present invention is a ship waste heat power generation system utilizing the waste heat of a ship, which includes an organic Rankine cycle (100) that uses steam that has passed through an economizer (500) and a boiler (600) installed on the exhaust side of the ship, and heated first fresh water from which heat has been recovered via a heat exchanger (300) after the heated seawater discharged after the cooling of the ship's engine as a heat source, and uses a portion of the seawater absorbed via a suction pump (200) as a thermal immersion, wherein the organic Rankine cycle includes: an evaporator (130) that uses the steam and the first fresh water as heat sources; a turbine generator (140, 150) that rotates and produces electricity using the working fluid that flows out after evaporation by the evaporator; a condenser (110) that uses a portion of the seawater absorbed via the suction pump as a thermal immersion and liquefies the working fluid that flows out from the turbine generator; and a circulation pump (120) that compresses the working fluid that flows out from the condenser and provides it to the evaporator.

[0009] To achieve the above objective, a ship waste heat power generation system utilizing the waste heat of a ship according to another embodiment of the present invention is a ship waste heat power generation system utilizing the waste heat of a ship, comprising: a primary heat source for the heated fresh water recovered from the heated fresh water discharged after the cooling of the ship's engine through a second heat exchanger (320); a secondary heat source for steam that has passed through an economizer (500) and a boiler (610) installed on the exhaust side of the ship; and a heat immersion of a portion of the third fresh water that has been heat-exchanged in the first heat exchanger (310) by seawater flowing in through a suction pump (200), wherein the organic Rankine cycle includes: an evaporator 1 (131) using the second fresh water as a heat source; an evaporator 2 (133) using the steam as a heat source and connected in series with the evaporator 1; and a turbine generator (140, 150) that rotates using the working fluid that flows out after evaporation by the evaporators 1 and 2 to produce electricity. The present invention is characterized by including a condenser (110) that uses a portion of the above-mentioned third freshwater as a thermal needle to liquefy the working fluid flowing out of the turbine generator, and a circulation pump (120) that compresses the working fluid flowing out of the condenser and provides it to the evaporator 1.

[0010] In the ship waste heat power generation system utilizing the waste heat of a ship according to the above embodiment, the first heat exchanger (310) exchanges heat with the third fresh water using seawater flowing in through the suction pump (200), the second heat exchanger (320) exchanges heat with the second fresh water using the heat-exchanged third fresh water, the circulation pump (330) circulates the third fresh water between the first heat exchanger (310) and the second heat exchanger (320), and the circulation pump (410) circulates the second fresh water between the second heat exchanger (320) and the evaporator 1 (131).

[0011] To achieve the above objective, another embodiment of the present invention provides a ship waste heat power generation system that utilizes the waste heat of a ship, which includes an organic Renkin cycle (100″) in which a portion of the seawater absorbed through a suction pump (200) is heated, using first fresh water heated by the waste heat of the duct and second fresh water heated by recovering heat from heated seawater discharged after the ship's engine cooling through a heat exchanger (300) in a pipe (P) passing outside one end of the ship's duct as heat sources, and the organic Renkin cycle is The system is characterized by including: an evaporator 3 (135) that uses the above-mentioned first freshwater as a heat source; an evaporator 4 (137) that uses the above-mentioned second freshwater as a heat source and is connected in parallel with the above-mentioned evaporator 3; a turbine generator (140, 150) that rotates using the working fluid that flows out after evaporation by the above-mentioned evaporators 3 and 4 to produce electricity; a condenser (110) that uses a portion of the seawater absorbed through the above-mentioned suction pump as a heat needle to liquefy the working fluid that flows out from the above-mentioned turbine generator; and a circulation pump (120) that compresses the working fluid that flows out from the above-mentioned condenser and provides it to the above-mentioned evaporators 3 and 4.

[0012] The ship waste heat power generation system utilizing the waste heat of a ship according to the other embodiment described above may further include a circulation pump (420) that circulates first fresh water heated by the waste heat of the duct within the above piping (P) via the above evaporator 3 (135); and a circulation pump (400) that circulates second fresh water heated through the above heat exchanger (300) via the above evaporator 4 (137). [Effects of the Invention]

[0013] According to the ship waste heat power generation system utilizing the waste heat of ships in an embodiment of the present invention, the system uses fresh water heated by passing it through an economizer and boiler installed on the exhaust side of the ship, and heated fresh water recovered from heated seawater discharged after the ship's engine cooling as a heat source. It also includes an organic lenkin cycle in which a portion of the seawater absorbed through a suction pump is heated, resulting in the excellent effect of increasing the energy recovery rate of waste heat discarded by ships using a variety of ship fuels.

[0014] Furthermore, according to the ship waste heat power generation system utilizing the waste heat of a ship as an embodiment of the present invention, there is an excellent effect in that the output of the organic Rankine cycle can be improved by increasing the amount of heat of vaporization by combining evaporators that use fresh water heated by exhaust gas waste heat and engine cooling water waste heat, which have different waste heat temperatures, as heat sources in parallel or in series when an organic Rankine cycle is configured. [Brief explanation of the drawing]

[0015] [Figure 1] This is a diagram showing the configuration of a ship waste heat power generation system that utilizes waste heat from a ship according to the first embodiment of the present invention. [Figure 2] This is a diagram showing the configuration of a ship-based waste heat power generation system that utilizes waste heat from a ship according to a second embodiment of the present invention. [Figure 3] This is a diagram illustrating the configuration of a ship-based waste heat power generation system that utilizes waste heat from a ship according to a third embodiment of the present invention. [Modes for carrying out the invention]

[0016] In describing embodiments of the present invention, if it is determined that a specific description of prior art related to the present invention may unnecessarily obscure the gist of the invention, such detailed description will be omitted. Furthermore, the terms described later are defined in consideration of the function in the present invention, and these may change depending on the intent or convention of the user or operator. For this reason, their definitions should be based on the content throughout this specification. The terms used in the detailed description are solely for the purpose of describing embodiments of the present invention and should not be interpreted restrictively. Unless otherwise specified, singular expressions include the meaning of plural. In this description, expressions such as "includes" or "equipped with" refer to a certain characteristic, number, step, action, element, part or combination thereof, and should not be interpreted as excluding the existence or possibility of one or more other characteristics, numbers, steps, actions, elements, part or combination thereof other than those described.

[0017] In each system shown in the drawings, elements in some cases may have the same or different reference numbers, suggesting that the represented elements may be different or similar. However, elements may have different realizations and may operate with some or all of the systems disclosed or described herein. The various elements shown in the drawings may be the same or different. It is arbitrary which ones are called the first element and which ones are called the second element.

[0018] In this specification, "transmitting," "communicating," or "providing" data or signals from one component to another component includes not only the direct transmission of data or signals from one component to another, but also the transmission of data or signals to another component via at least one other component.

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0020] [First Embodiment] Figure 1 is a configuration diagram of a marine waste heat power generation system using marine waste heat according to a first embodiment of the present invention.

[0021] As shown in Figure 1, the marine waste heat power generation system using marine waste heat according to the first embodiment of the present invention comprises an organic Rankine cycle 100 and peripheral devices.

[0022] The organic Rankine cycle 100 does not use fuel, and functions to produce electric power from waste heat discarded through an engine and an exhaust port. The organic Rankine cycle 100 comprises an evaporator 130, turbine generators 140 and 150, a condenser 110, and a circulation pump 120.

[0023] The evaporator 130 functions to evaporate a working fluid by using, as a heat source, first heated fresh water obtained by recovering heat through a heat exchanger 300 from steam that has passed through an economizer 500 and a boiler 600 installed on an exhaust port side of a marine vessel and from heated seawater discharged after cooling a marine engine.

[0024] After being evaporated by the evaporator 130, the turbine generator is rotated by the outflowing working fluid to function to produce electric power, and comprises a turbine 140 rotated by the outflowing working fluid and a generator 150 that produces electric power when the turbine 140 rotates.

[0025] The condenser 110 uses, as a heat sink, a part of seawater sucked through a suction pump 200, and functions to liquefy the working fluid flowing out from the turbine generators 140 and 150.

[0026] The circulation pump 120 compresses the working fluid flowing out from the condenser 110 and functions to supply the compressed working fluid to the evaporator 130.

[0027] The peripheral devices comprise a suction pump 200, a heat exchanger 300, a circulation pump 400, an economizer 500, and a boiler 600.

[0028] The suction pump 200 draws in seawater by the rotational force of a motor, and functions to supply the seawater to the condenser 110 and a cooling unit of the engine.

[0029] The heat exchanger 300 plays a role in exchanging heat with the second fresh water supplied to the evaporator 130 using heated seawater discharged after engine cooling.

[0030] The circulation pump 400 is responsible for circulating the second fresh water between the heat exchanger 300 and the evaporator 130.

[0031] The Economizer 500 is a device that uses heat from the exhaust port to preheat the feedwater flowing into the Boiler 600, and is also called an anti-coalifier. The Economizer 500 improves the thermal efficiency of the Boiler 600 and reduces thermal stress and corrosion of the boiler walls.

[0032] The boiler 600 generates steam heated using ship fuel and supplies it to the evaporator 130.

[0033] According to the first embodiment of the present invention configured as described above, the ship waste heat power generation system utilizing the waste heat of a ship uses steam that has passed through an economizer and boiler installed on the exhaust side of the ship, and heated fresh water recovered through a heat exchanger from heated seawater discharged after the ship's engine cooling as a heat source, and is configured to include an organic cold cycle in which a portion of the seawater absorbed through a suction pump is heated, thereby increasing the energy recovery rate of waste heat discarded by ships that use a variety of ship fuels.

[0034] [Second Example] Figure 2 is a diagram showing the configuration of a ship-based waste heat power generation system that utilizes waste heat from a ship according to a second embodiment of the present invention.

[0035] A ship waste heat power generation system utilizing waste heat from a ship according to a second embodiment of the present invention includes an organic Rankine cycle 100' and peripheral equipment, as shown in Figure 2.

[0036] The organic Rankine cycle 100' does not use fuel and produces electricity using waste heat that is discarded through the engine and exhaust. The organic Rankine cycle 100' includes evaporator 1 131, evaporator 2 133, turbine generators 140, 150, condenser 110, and circulation pump 120.

[0037] The evaporator 131 recovers heat from the heated fresh water discharged after the ship's engine cooling through the second heat exchanger 320, and uses the heated second fresh water as a heat source to secondarily evaporate the working fluid.

[0038] Evaporator 2 133 is connected in series with evaporator 1 131 and plays the role of secondarily evaporating the working fluid that has been first evaporated by evaporator 1 131. Evaporator 2 133 primarily evaporates the working fluid using steam that has passed through economizer 500 and boiler 610, which are installed on the exhaust side of the ship, as a heat source.

[0039] The turbine generator plays the role of producing electricity by rotating with the working fluid that flows out after being evaporated by evaporators 1 and 2, 131 and 133, and includes a turbine 140 that rotates with the flowing working fluid and a generator 150 that produces electricity when the turbine 140 rotates.

[0040] The condenser 110 uses a portion of the third freshwater, which has undergone heat exchange in the first heat exchanger 310 with seawater flowing in through the suction pump 200, as a heat needle to liquefy the working fluid flowing out from the turbine generators 140 and 150.

[0041] The circulation pump 120 compresses the working fluid flowing out of the condenser 110 and supplies it to the evaporator 131.

[0042] Peripheral equipment includes a suction pump 200, a first heat exchanger 310, a second heat exchanger 320, a circulation pump 330, a circulation pump 410, an economizer 500, and a boiler 610.

[0043] The suction pump 200 absorbs seawater using the rotational force of its motor and supplies it to the first heat exchanger 310.

[0044] The first heat exchanger 310 is responsible for exchanging heat with the third fresh water supplied to the condenser 110 by seawater that flows in through the suction pump 200.

[0045] The second heat exchanger 320 plays the role of exchanging heat between the heat-exchanged third freshwater and the second freshwater supplied to the evaporator 131.

[0046] The circulation pump 330 is responsible for circulating the third fresh water between the first heat exchanger 310 and the second heat exchanger 320.

[0047] The circulation pump 410 is responsible for circulating the second fresh water between the second heat exchanger 320 and the evaporator 1131.

[0048] The Economizer 500 is a device that uses heat from the exhaust port to preheat the feedwater flowing into the boiler 610, and is also called an anti-coalifier. The Economizer 500 improves the thermal efficiency of the boiler 610 and reduces thermal stress and corrosion of the boiler walls.

[0049] The boiler 600 generates steam heated using ship fuel and supplies it to the evaporator 130.

[0050] According to the ship waste heat power generation system utilizing the waste heat of a ship as configured in the second embodiment of the present invention as described above, the output of the organic Rankine cycle can be improved by increasing the amount of heat of evaporation by combining evaporators 1, 2 131, and 133 in series, which use fresh water heated by exhaust gas waste heat and engine cooling water waste heat, which have different waste heat temperatures, as heat sources when the organic Rankine cycle 100' is configured.

[0051] [Third Embodiment] Figure 3 is a diagram showing the configuration of a ship waste heat power generation system that utilizes waste heat from a ship according to a third embodiment of the present invention.

[0052] A third embodiment of the present invention, a ship-based waste heat power generation system utilizing waste heat from a ship, includes an organic Rankine cycle 100″ and peripheral equipment, as shown in Figure 2.

[0053] The Organic Rankine Cycle 100″ is designed to produce electricity without using fuel, utilizing waste heat discarded through the engine and exhaust. The Organic Rankine Cycle 100″ includes evaporators 3 135, 4 137, turbine generators 140 and 150, a condenser 110, and a circulation pump 120.

[0054] The evaporator 3135 recovers heat from heated seawater discharged after the ship's engine cooling through the heat exchanger 300, and uses the heated second freshwater as a heat source to evaporate the working fluid.

[0055] Evaporator 4 137 is connected in parallel with evaporator 3 135 and evaporates the working fluid using first fresh water, which is heated by the waste heat of the duct, as a heat source within piping P that passes outside one end of the ship's duct. Through the parallel operation of the evaporators, the amount of power generated is selected individually based on the safety of the heat source and the heat content of the steam and cooling water.

[0056] The turbine generator is responsible for producing electricity by rotating with the working fluid that flows out after being evaporated by evaporators 3, 4, 135, and 137, and includes a turbine 140 that rotates with the working fluid and a generator 150 that produces electricity when the turbine 140 rotates.

[0057] The condenser 110 uses a portion of the seawater absorbed through the suction pump 200 as a heat needle to liquefy the working fluid flowing out from the turbine generators 140 and 150.

[0058] The circulation pump 120 compresses the working fluid flowing out of the condenser 110 and supplies it to the evaporators 3, 4 135, and 137.

[0059] Peripheral equipment includes a suction pump 200, a heat exchanger 300, a circulation pump 400, and a circulation pump 420.

[0060] The intake pump 200 absorbs seawater using the rotational force of the motor and supplies it to the condenser 110 and the engine's cooling system.

[0061] The heat exchanger 300 uses heated seawater discharged after engine cooling to exchange heat with the second freshwater supplied to the evaporator 4 137.

[0062] The circulation pump 400 is responsible for circulating the second freshwater between the heat exchanger 300 and the evaporator 4137.

[0063] The circulation pump 420 is responsible for circulating the first fresh water, which has been heated by the waste heat from the duct within the piping P, through the evaporator 3 135.

[0064] According to the third embodiment of the present invention configured as described above, the efficiency of the ship's waste heat power generation system, which utilizes the waste heat of a ship, can be improved by combining evaporators 3, 4, 135, and 137 in parallel, which use fresh water heated by exhaust gas waste heat and engine cooling water waste heat, which have different waste heat temperatures, as heat sources when the organic Rankine cycle 100″ is configured, thereby reducing the amount of heat to evaporate.

[0065] The drawings and specification disclose optimal embodiments and use specific terminology, but this is solely for the purpose of illustrating embodiments of the invention and not to limit its meaning or the scope of the invention as described in the claims. Therefore, a person with ordinary skill in the art will understand that a variety of modifications and equivalent other embodiments are possible. Accordingly, the true scope of technical protection of the invention should be determined by the technical idea of ​​the appended claims.

Claims

1. A ship's waste heat power generation system that utilizes the waste heat of a ship, comprising an organic Rankine cycle (100) which uses heated first fresh water obtained by recovering heat from steam that has passed through an economizer (500) and boiler (600) installed on the exhaust side of the ship, and heated seawater discharged after the ship's engine has cooled, via a heat exchanger (300), as a heat source, and a portion of the seawater absorbed via a suction pump (200) as a cooling source, The above organic Rankine cycle is Evaporator (130) using the above steam and first fresh water as heat sources; A turbine generator (140, 150) that rotates and produces electricity using the working fluid that flows out after evaporation by the above-mentioned evaporator; A condenser (110) that uses a portion of the seawater absorbed through the above-mentioned suction pump as a cooling source to liquefy the working fluid flowing out of the above-mentioned turbine generator; and A ship's waste heat power generation system utilizing the waste heat of a ship, comprising a circulation pump (120) that compresses the working fluid flowing out of the condenser and provides it to the evaporator.

2. A ship's waste heat power generation system that utilizes the waste heat of a ship, comprising an organic Rankine cycle (100') in which heat is recovered from heated fresh water discharged after the cooling of the ship's engine through a second heat exchanger (320) to heat the second fresh water, which is used as the primary heat source; steam that has passed through an economizer (500) and a boiler (610) installed on the exhaust side of the ship is used as the secondary heat source; and a portion of the third fresh water that has undergone heat exchange in the first heat exchanger (310) with seawater flowing in through a suction pump (200) is used as the cooling source. The above organic Rankine cycle is Evaporator 1 (131) using the above-mentioned second freshwater as a heat source; Evaporator 2 (133) is connected in series with evaporator 1, using the above-mentioned steam as a heat source; A turbine generator (140, 150) rotates using the working fluid that flows out after evaporation by the above-mentioned evaporators 1 and 2, thereby producing electricity; A condenser (110) that uses a portion of the above-mentioned third freshwater as a cooling source to liquefy the working fluid flowing out from the above-mentioned turbine generator; and A ship's waste heat power generation system utilizing the waste heat of a ship, comprising a circulation pump (120) that compresses the working fluid flowing out of the condenser and provides it to the evaporator 1.

3. The first heat exchanger (310) above exchanges heat between the third freshwater and the seawater that flows in through the suction pump (200). The second heat exchanger (320) above causes the second freshwater to undergo heat exchange with the heat-exchanged third freshwater, The circulation pump (330) circulates the third fresh water between the first heat exchanger (310) and the second heat exchanger (320). The ship's waste heat power generation system according to claim 2, wherein the circulation pump (410) circulates the second fresh water between the second heat exchanger (320) and the evaporator 1 (131).

4. A ship's waste heat power generation system that utilizes the waste heat of a ship, comprising an organic Rankine cycle (100″) in which a first freshwater heated by the waste heat of the duct and a second freshwater heated by recovering heat from heated seawater discharged after the ship's engine cooling via a heat exchanger (300) are used as heat sources in a pipe (P) passing outside one end of the ship's duct, and a portion of the seawater absorbed via a suction pump (200) is used as a cooling source, wherein The above organic Rankine cycle is Evaporator 3 (135) using the above-mentioned first freshwater as a heat source; Evaporator 4 (137) connected in parallel with evaporator 3, using the above-mentioned second fresh water as a heat source; A turbine generator (140, 150) rotates using the working fluid that flows out after evaporation by the above-mentioned evaporators 3 and 4, and produces electricity; A condenser (110) that uses a portion of the seawater absorbed through the above-mentioned suction pump as a cooling source to liquefy the working fluid flowing out of the above-mentioned turbine generator; and A ship's waste heat power generation system that utilizes the waste heat of a ship, comprising a circulation pump (120) that compresses the working fluid flowing out of the condenser and provides it to the evaporators 3 and 4.

5. A circulation pump (420) that circulates the first fresh water, heated by the waste heat of the duct within the above-mentioned piping (P), via the above-mentioned evaporator 3 (135); and A ship waste heat power generation system utilizing the waste heat of a ship according to claim 4, further comprising: a circulation pump (400) for circulating a second freshwater heated through the heat exchanger (300) through the evaporator 4 (137);

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