A ship waste heat power generation system that utilizes waste heat recovered from an LNG-engine ship through an economizer

Abstract

The present invention relates to a marine waste heat power generation system that utilizes waste heat from an LNG engine ship recovered through an economizer, and in particular to a marine waste heat power generation system that utilizes waste heat from an LNG engine ship recovered through an economizer, in which waste heat generated from an LNG engine is recovered through an economizer, high-temperature, high-pressure steam flowing out of the economizer is supplied to an evaporator of an organic Rankine cycle to produce electricity, and part of the high-temperature, high-pressure steam is used to remove soot generated on the contact surface between the exhaust gas of the LNG engine and the economizer.

Description

[Technical Field]

[0001] The present invention relates to a marine waste heat power generation system that utilizes waste heat from an LNG engine ship recovered through an economizer, and more particularly to a marine waste heat power generation system that utilizes waste heat from an LNG engine ship recovered through an economizer, recovers waste heat generated from the LNG engine through the economizer, supplies high-temperature, high-pressure steam flowing from the economizer to an evaporator of an organic Rankine cycle to produce electricity, and uses a portion of the high-temperature, high-pressure steam to remove soot generated at the contact surface between the exhaust gas of the LNG engine and the economizer. [Background technology]

[0002] In recent years, as part of the International Maritime Organization's (IMO) efforts to realize environmentally friendly ships, engines that use natural gases such as LNG as fuel are being developed and are being prepared for refueling. Existing diesel engines require the production of high-temperature steam to heat the fuel, and this steam is supplied with heat by utilizing the waste heat from the exhaust gas generated by the ship. However, ships that use LNG as fuel do not require fuel heating, which means that they can utilize even more waste heat than the waste heat from the exhaust gas generated by existing diesel ships.

[0003] In addition, the high-temperature exhaust gas generated from the main engine of an LNG carrier can be heat-exchanged with high-density, stable water and used as a heat source for a modularized organic Rankine cycle power generation facility. Water has high density and a large amount of latent heat, which has the advantage of minimizing the volume of the economizer tubes during the exhaust heat recovery process. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Korean Patent Publication No. 2012-0110709 (Title of invention: Organic Rankine cycle power generation system using waste heat) Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a ship waste heat power generation system that utilizes waste heat from an LNG engine ship recovered through an economizer, which can maximize the heat recovery rate of exhaust gas generated from the LNG engine.

[0006] Another object of the present invention is to provide a ship waste heat power generation system that utilizes waste heat from an LNG engine ship recovered through an economizer, thereby maximizing energy conversion. [Means for solving the problem]

[0007] In order to achieve the above object, a marine waste heat power generation system utilizing waste heat from an LNG engine ship recovered through an economizer according to an embodiment of the present invention includes an organic Rankine cycle (100) in which an economizer (300) installed on the exhaust port side of the LNG engine ship uses exhaust gas generated from a main engine as a heat source to exchange heat with water to generate high-temperature, high-pressure steam as a heat source, and fresh water heat-exchanged through a seawater heat exchanger (200) as a heat sink. The organic Rankine cycle (100) The cycle includes an evaporator 110 that uses high-temperature, high-pressure steam generated by the economizer as a heat source; a turbine generator 120 that generates electricity by rotating with the refrigerant that flows out after being evaporated by the evaporator; a condenser 130 that liquefies the refrigerant that flows out of the turbine generator using the fresh water that has been heat exchanged through the seawater heat exchanger as a heat sink; and a circulation pump 140 that compresses the refrigerant that flows out of the condenser and supplies it to the evaporator, and further includes a circulation pump 410 that circulates the fluid that flows out of the evaporator to the economizer.

[0008] To achieve the above object, according to another embodiment of the present invention, a marine waste heat power generation system utilizing waste heat from an LNG engine marine vessel recovered through an economizer includes: an economizer 300 installed on the exhaust port side of the LNG engine marine vessel; a first organic Rankine cycle 100 having a heat source in which high-temperature, high-pressure steam is generated by heat exchange with water using exhaust gas generated from a main engine as a heat source, and fresh water heat-exchanged through a seawater heat exchanger 200 as a heat sink; and a second organic Rankine cycle 100 having a heat source in which a fluid discharged after being used as a heat source in the first organic Rankine cycle is used as a heat source, and a second organic Rankine cycle 100 having a heat sink in which a fluid discharged after being used as a heat source in the first organic Rankine cycle is used as a heat source. A marine waste heat power generation system utilizing waste heat from an LNG engine ship recovered through an economizer, including a second organic Rankine cycle (100') using fresh water discharged after being used as a heat sink in the first organic Rankine cycle as a heat sink, wherein the first organic Rankine cycle includes a first evaporator (110) that uses high-temperature, high-pressure steam generated by the economizer as a heat source, a first turbine generator (120) that generates electricity by rotating with a refrigerant that flows out after being evaporated by the first evaporator, and a seawater heat exchanger. The second organic Rankine cycle includes a first condenser 130 that liquefies the refrigerant flowing out of the first turbine generator using the fresh water as a heat sink, and a circulation pump 140 that compresses the refrigerant flowing out of the first condenser and supplies it to the first evaporator. The second organic Rankine cycle includes a second evaporator 110' that uses the fluid discharged after being used as a heat sink in the first evaporator as a heat source, a second turbine generator 120' that rotates and produces electricity using the refrigerant that flows out after being evaporated by the second evaporator, and a circulation pump 140 that compresses the refrigerant flowing out of the first condenser and supplies it to the first evaporator. The refrigerant circulation system further includes a second condenser 130' that liquefies the refrigerant flowing out of the second turbine generator using the fluid discharged after use as a heat sink, and a circulation pump 140' that compresses the refrigerant flowing out of the second condenser and supplies the refrigerant to the second evaporator, a heat exchanger 600 that exchanges heat with the refrigerant flowing out of the second condenser using high-temperature refrigerant flowing out of the first turbine generator, and supplies the refrigerant to the circulation pump 140', and a circulation pump 510 that circulates the fluid flowing out of the second evaporator to the economizer.

[0009] The marine waste heat power generation system using the waste heat of an LNG engine ship recovered through the economizer according to the above embodiment may be configured such that a portion of the high-temperature, high-pressure steam generated in the economizer 300 is provided to the contact surface between the exhaust gas and the economizer through a steam valve 400 to remove soot.

[0010] The ship waste heat power generation system utilizing the waste heat of an LNG engine ship recovered through the economizer according to the above embodiment may be configured such that the fluid supplied to the economizer 300 through the circulation pump 410 is preheated by the first preheater 500 and the second preheater 510 using exhaust gas generated from the main engine as a heat source.

[0011] In the ship waste heat power generation system that utilizes waste heat from an LNG engine ship recovered through an economizer according to the above embodiment, the seawater heat exchanger 200 can be configured to provide fresh water that has been heat exchanged with seawater taken in by a circulation pump 210 to the first condenser 130 as a heat sink, and the fresh water discharged after being used as a heat sink in the first condenser can be provided as a heat sink to the second condenser 130', and the fresh water discharged after being used as a heat sink in the second condenser can be provided to the seawater heat exchanger. [Effects of the Invention]

[0012] According to an embodiment of the present invention, a marine waste heat power generation system utilizing waste heat from an LNG engine marine vessel recovered through an economizer includes an economizer 300 installed on the exhaust port side of the LNG engine marine vessel. The economizer 300 uses exhaust gas generated from the main engine as a heat source to exchange heat with water to generate high-temperature, high-pressure steam as a heat source, and fresh water heat-exchanged through the seawater heat exchanger 200 as a heat sink. Fluid supplied to the economizer 300 through a circulation pump 410 is preheated by a first preheater 500 and a second preheater 510 that use exhaust gas generated from the main engine as a heat source, thereby providing an excellent effect of maximizing the heat recovery rate of the exhaust gas generated from the LNG engine.

[0013] According to an embodiment of the present invention, a marine waste heat power generation system using waste heat recovered from an LNG-engine marine vessel through an economizer includes an economizer 300 installed on the exhaust port side of the LNG-engine marine vessel, which is configured by connecting first and second organic Rankine cycles in series. The economizer 300 uses high-temperature, high-pressure steam generated by heat exchange between water and exhaust gas generated from the main engine as a heat source, thereby providing an excellent effect of maximizing energy conversion. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a configuration diagram of a ship waste heat power generation system that utilizes waste heat from an LNG engine ship recovered via an economizer according to a first embodiment of the present invention. [Figure 2] FIG. 10 is a configuration diagram of a ship waste heat power generation system that utilizes waste heat from an LNG engine ship recovered via an economizer according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] When describing embodiments of the present invention, detailed descriptions of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, and such detailed descriptions will be omitted. The terms used below are defined in consideration of the functions of the present invention and may vary depending on the intentions or practices of users and operators. Therefore, definitions should be based on the overall content of this specification. Terms used in the detailed description are intended only to describe embodiments of the present invention and should not be construed as limiting. Unless otherwise specified, singular terms include plural terms. In this description, terms such as "comprise" or "comprise" refer to certain features, numbers, steps, operations, elements, or portions or combinations thereof, and should not be construed as excluding the presence or possibility of one or more other features, numbers, steps, operations, elements, portions or combinations thereof other than those described.

[0016] In each system shown in the drawings, elements in some cases may have the same or different reference numbers, respectively, which may indicate that the depicted elements may be different or similar. However, elements may have different implementations and 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. Which elements are referred to as first elements and which as second elements is arbitrary.

[0017] In this specification, when one component "transmits," "conveys," or "provides" data or signals to another component, this includes not only the component transmitting the data or signals directly to the other component, but also the component transmitting the data or signals to the other component via at least one other component.

[0018] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0019] [First embodiment] FIG. 1 is a configuration diagram of a ship waste heat power generation system that utilizes waste heat from an LNG engine ship recovered via an economizer according to a first embodiment of the present invention.

[0020] A marine waste heat power generation system that utilizes waste heat from an LNG engine marine vessel recovered through an economizer according to a first embodiment of the present invention includes an organic Rankine cycle 100 and peripheral devices, as shown in FIG.

[0021] The organic Rankine cycle 100 plays a role in producing electricity by using high-temperature, high-pressure steam generated by an economizer 300 installed on the exhaust port side of an LNG engine ship, which exchanges heat with water using exhaust gas generated from a main engine as a heat source, as a heat source, and fresh water that has been heat-exchanged through a seawater heat exchanger 200 as a heat sink. The organic Rankine cycle 100 includes an evaporator 110, a turbine generator 120, a condenser 130, and a circulation pump 140.

[0022] The evaporator 110 serves to evaporate the refrigerant using, as a heat source, high-temperature, high-pressure steam generated by an economizer 300 installed on the exhaust port side of the LNG ship.

[0023] The turbine generator 120 rotates with the refrigerant that flows out after being evaporated by the evaporator 110 to generate electricity, and includes a turbine that rotates with the flowing refrigerant and a generator that generates electricity when the turbine rotates.

[0024] The condenser 130 serves to liquefy the refrigerant flowing out from the turbine generator 120 by using the freshwater that has undergone heat exchange via the seawater heat exchanger 200 as a heat sink.

[0025] The circulation pump 140 serves to compress the refrigerant flowing out of the condenser 130 and supply it to the evaporator 110 .

[0026] The peripheral devices include a seawater heat exchanger 200 , a circulation pump 210 , an economizer 300 , a steam valve 400 , a first preheater 500 , a second preheater 510 and a circulation pump 410 .

[0027] The seawater heat exchanger 200 performs heat exchange between seawater taken in by a circulation pump 210 and fresh water, and serves to provide the fresh water to the condenser 130 as a heat sink.

[0028] The circulation pump 210 serves to take in seawater and provide it to the seawater heat exchanger 200 .

[0029] The economizer 300 is installed on the exhaust side of the LNG engine ship and uses exhaust gas of 400°C or more generated from the main engine as a heat source to exchange heat with water to generate high-temperature, high-pressure steam, which is then supplied to the evaporator 110.

[0030] The steam valve 400 is installed on a pipe that branches off a portion of the high-temperature, high-pressure steam generated by the economizer 300 and is used to remove soot that accumulates on the contact surface between the exhaust gas and the economizer 300. The soot contained in the exhaust gas adheres to the economizer 300, causing problems such as a decrease in heat capacity and a loss of exhaust pressure. When the steam valve 400 is opened, a portion of the high-temperature, high-pressure steam from the economizer 300 is provided to the contact surface between the exhaust gas and the economizer 300, thereby removing the adhered soot. This solves problems such as a decrease in heat capacity and a loss of exhaust pressure due to the adhesion of soot to the economizer 300.

[0031] The first preheater 500 serves to preheat the fluid supplied to the economizer 300 via the circulation pump 410 using the exhaust gas generated from the main engine as a heat source.

[0032] The second preheater 510 serves to preheat the fluid that has passed through the first preheater 500 using the exhaust gas as a heat source, and to provide the preheated fluid to the economizer 300 .

[0033] The circulation pump 410 serves to circulate the fluid between the evaporator 110 and the first preheater 500 .

[0034] According to the marine waste heat power generation system using waste heat recovered from an LNG engine marine vessel via the economizer according to the first embodiment of the present invention, the economizer 300 installed on the exhaust port side of the LNG engine marine vessel includes an organic Rankine cycle in which high-temperature, high-pressure steam generated by heat exchange with water using exhaust gas generated from the main engine as a heat source is used as a heat source, and fresh water heat-exchanged via the seawater heat exchanger 200 is used as a heat sink. The fluid supplied to the economizer 300 via the circulation pump 410 is preheated by the first preheater 500 and the second preheater 510, which use the exhaust gas generated from the main engine as a heat source, thereby maximizing the heat recovery rate of the exhaust gas generated from the LNG engine.

[0035] [Second embodiment] FIG. 2 is a configuration diagram of a ship waste heat power generation system that utilizes waste heat from an LNG engine ship recovered through an economizer according to a second embodiment of the present invention.

[0036] A ship waste heat power generation system that utilizes waste heat from an LNG engine ship recovered through an economizer according to a second embodiment of the present invention includes a first organic Rankine cycle 100, a second organic Rankine cycle 100', and peripheral devices, as shown in FIG.

[0037] The first organic Rankine cycle 100 plays a role in producing electricity by using high-temperature, high-pressure steam generated by an economizer 300 installed on the exhaust port side of the LNG engine ship, which exchanges heat with water using exhaust gas generated from the main engine as a heat source, as a heat source, and fresh water that has been heat exchanged through a seawater heat exchanger 200 as a heat sink. The first organic Rankine cycle 100 includes a first evaporator 110, a turbine generator 120, a first condenser 130, and a circulation pump 140.

[0038] The first evaporator 110 serves to evaporate the refrigerant using high-temperature, high-pressure steam generated by an economizer 300 installed on the exhaust port side of the LNG ship as a heat source.

[0039] The turbine generator 120 rotates using the refrigerant that flows out after being evaporated by the first evaporator 110 to generate electricity, and includes a turbine that rotates using the refrigerant that flows out, and a generator that generates electricity when the turbine rotates.

[0040] The first condenser 130 serves to liquefy the refrigerant flowing out from the turbine generator 120 by using the fresh water that has undergone heat exchange via the seawater heat exchanger 200 as a heat sink.

[0041] The circulation pump 140 serves to compress the refrigerant flowing out of the first condenser 130 and supply the compressed refrigerant to the first evaporator 110 .

[0042] The second organic Rankine cycle 100′ serves to produce electricity using, as a heat source, a fluid discharged after being used as a heat source in the first evaporator 110 of the first organic Rankine cycle 100, and, as a heat sink, fresh water discharged after being used as a heat sink in the first condenser 130 of the first organic Rankine cycle 100. The second organic Rankine cycle 100′ includes a second evaporator 110′, a second turbine generator 120′, a second condenser 130′, and a circulation pump 140′.

[0043] The second evaporator 110' serves to evaporate the refrigerant using the fluid discharged from the first evaporator 110 after being used as a heat sink as a heat source.

[0044] The second turbine generator 120' rotates with the refrigerant that flows out after being evaporated by the second evaporator 110' to generate electricity, and includes a turbine that rotates with the flowing refrigerant and a generator that generates electricity when the turbine rotates.

[0045] The second condenser 130' serves to liquefy the refrigerant flowing out from the second turbine generator 120', using the fluid discharged after being used as a heat sink in the first condenser 130 as a heat sink.

[0046] The circulation pump 140' serves to compress the refrigerant flowing out of the second condenser 130' and supply the compressed refrigerant to the second evaporator 110'.

[0047] The peripheral devices include a heat exchanger 600 , a seawater heat exchanger 200 , a circulation pump 210 , an economizer 300 , a steam valve 400 , a first preheater 500 , a second preheater 510 and a circulation pump 410 .

[0048] The heat exchanger 600 serves to exchange heat with the refrigerant flowing out of the second condenser 130' using the high-temperature refrigerant flowing out of the first turbine generator 120, and to provide the refrigerant to the circulation pump 140'. In addition, the refrigerant heat exchanger 600 serves to reduce the energy wasted by the heat exchange between the low-temperature refrigerant of the second organic Rankine cycle 100' and the high-temperature refrigerant of the first organic Rankine cycle 100, and to reduce the volume of the condenser of each cycle.

[0049] The seawater heat exchanger 200 exchanges heat between seawater taken in by the circulation pump 210 and fresh water, and serves to provide the fresh water to the first condenser 130 as a heat sink.

[0050] The circulation pump 210 serves to take in seawater and provide it to the seawater heat exchanger 200 .

[0051] The economizer 300 is installed on the exhaust side of the LNG engine ship and uses exhaust gas of 400°C or more generated from the main engine as a heat source to exchange heat with water to generate high-temperature, high-pressure steam, which is then supplied to the first evaporator 110.

[0052] The steam valve 400 is installed on a pipe that branches off a portion of the high-temperature, high-pressure steam generated by the economizer 300 and is used to remove soot that accumulates on the contact surface between the exhaust gas and the economizer 300. The soot contained in the exhaust gas adheres to the economizer 300, causing problems such as a decrease in heat capacity and a loss of exhaust pressure. When the steam valve 400 is opened, a portion of the high-temperature, high-pressure steam from the economizer 300 is provided to the contact surface between the exhaust gas and the economizer 300, thereby removing the adhered soot. This solves problems such as a decrease in heat capacity and a loss of exhaust pressure due to the adhesion of soot to the economizer 300.

[0053] The first preheater 500 serves to preheat the fluid supplied to the economizer 300 via the circulation pump 410 using the exhaust gas generated from the main engine as a heat source.

[0054] The second preheater 510 serves to preheat the fluid that has passed through the first preheater 500 using the exhaust gas as a heat source, and to provide the preheated fluid to the economizer 300 .

[0055] The circulation pump 410 serves to circulate the fluid between the second evaporator 110 ′ and the first preheater 500 .

[0056] According to the marine vessel waste heat power generation system using waste heat recovered from an LNG engine vessel through the economizer according to the second embodiment of the present invention configured as described above, the economizer 300 installed on the exhaust port side of the LNG engine vessel is configured by connecting first and second organic Rankine cycles in series, each of which uses high-temperature, high-pressure steam generated by heat exchange between water and exhaust gas generated from the main engine as a heat source, thereby maximizing energy conversion.

[0057] The drawings and the specification disclose the best mode for carrying out the invention, and specific terms are used, but these terms are used merely for the purpose of describing the embodiment of the invention, and are not used to limit the meaning or the scope of the invention as described in the claims. Therefore, a person skilled in the art will understand that various modifications and equivalent embodiments are possible. Therefore, the true technical scope of protection of the invention should be determined by the technical spirit of the appended claims.

Claims

1. The marine waste heat power generation system utilizes waste heat from the LNG engine marine vessel recovered through the economizer, the system including an organic Rankine cycle (100) in which an economizer (300) installed on the exhaust port side of the LNG engine marine vessel uses exhaust gas generated from a main engine as a heat source to exchange heat with water to generate high-temperature, high-pressure steam as a heat source, and fresh water heat-exchanged via a seawater heat exchanger (200) as a heat sink, The organic Rankine cycle comprises: an evaporator (110) that uses high-temperature, high-pressure steam generated by the economizer as a heat source; a turbine generator (120) that generates electricity by being rotated by the refrigerant that flows out after being evaporated by the evaporator; a condenser (130) that liquefies the refrigerant flowing out of the turbine generator by using the fresh water that has been heat exchanged through the seawater heat exchanger as a heat sink; a circulation pump (140) for compressing the refrigerant flowing out of the condenser and supplying it to the evaporator; a circulation pump (410) for circulating fluid exiting the evaporator to the economizer; A marine waste heat power generation system configured such that a portion of the high-temperature, high-pressure steam generated in the economizer (300) is provided to a contact surface between the exhaust gas and the economizer via a steam valve (400) to remove soot.

2. a first organic Rankine cycle (100) in which an economizer (300) installed on the exhaust port side of the LNG engine ship uses exhaust gas generated from the main engine as a heat source to exchange heat with water to generate high-temperature, high-pressure steam as a heat source, and fresh water heat-exchanged via a seawater heat exchanger (200) as a heat sink; a second organic Rankine cycle (100') using a fluid discharged after being used as a heat source in the first organic Rankine cycle as a heat source, and fresh water discharged after being used as a heat sink in the first organic Rankine cycle as a heat sink, the second organic Rankine cycle (100') using waste heat from an LNG engine ship recovered via an economizer, The first organic Rankine cycle a first evaporator (110) that uses high-temperature, high-pressure steam generated by the economizer as a heat source; a first turbine generator (120) that generates electricity by being rotated by the refrigerant that flows out after being evaporated by the first evaporator; a first condenser (130) that liquefies the refrigerant flowing out from the first turbine generator by using the fresh water that has been heat exchanged through the seawater heat exchanger as a heat sink; a circulation pump (140) for compressing the refrigerant flowing out of the first condenser and supplying the refrigerant to the first evaporator, The second organic Rankine cycle a second evaporator (110') that uses, as a heat source, the fluid discharged after being used as a heat sink in the first evaporator; a second turbine generator (120') that generates electricity by being rotated by the refrigerant that flows out after being evaporated by the second evaporator; a second condenser (130') that liquefies the refrigerant flowing out from the second turbine generator by using a fluid discharged after being used as a heat sink in the first condenser as a heat sink; a circulation pump (140') for compressing the refrigerant flowing out of the second condenser and supplying the refrigerant to the second evaporator, The method further includes a heat exchanger (600) that exchanges heat with the refrigerant flowing out of the second condenser using the high-temperature refrigerant flowing out of the first turbine generator, and supplies the refrigerant to the circulation pump (140'), The marine waste heat power generation system further includes a circulation pump (410) that circulates fluid flowing out of the second evaporator to the economizer.

3. 3. The marine vessel waste heat power generation system according to claim 2, wherein a portion of the high-temperature, high-pressure steam generated in the economizer is provided to a contact surface between the exhaust gas and the economizer via a steam valve to remove soot.

4. 3. The ship waste heat power generation system according to claim 1, wherein the fluid supplied to the economizer via the circulation pump is preheated by a first preheater and a second preheater that use exhaust gas generated by the main engine as a heat source.

5. The seawater heat exchanger (200) provides fresh water that has been heat exchanged with seawater taken in by a circulation pump (210) to the first condenser (130) as a heat sink; The fresh water discharged after being used as a heat sink in the first condenser is provided as a heat sink to the second condenser (130'), The marine waste heat power generation system according to claim 2 , wherein fresh water discharged after being used as a heat sink in the second condenser is provided to the seawater heat exchanger.

Images