KR20230171055A - Ammonia fuel vessel - Google Patents

Abstract

An ammonia fueled vessel is provided by one embodiment of the present invention.
An ammonia fuel ship according to an embodiment of the present invention includes a hull, a fuel tank installed on the hull and storing liquid ammonia, and liquid ammonia or ammonia generated by vaporizing liquid ammonia from a first fuel supply pipe connected to the fuel tank. A main engine that receives supply and combusts to generate power, and a first exhaust system installed on the first exhaust pipe connected to the main engine to reduce at least one of nitrous oxide, nitrogen oxide, and ammonia slip contained in the exhaust gas discharged from the main engine. A boiler that receives liquid ammonia or ammonia from a second fuel supply pipe connected to a treatment device and a fuel tank and burns it to generate steam, and is installed on a second exhaust pipe connected to the boiler and contains nitrous oxide contained in the exhaust gas discharged from the boiler. , a second post-processing device that reduces at least one of nitrogen oxides and ammonia slip, and a heat medium flows therein to recover heat from the second exhaust pipe at the rear of the second post-treatment device and the first exhaust pipe at the front of the first post-treatment device. It may include a heat exchange line provided to.

Description

Ammonia fuel vessel

The present invention relates to an ammonia-fueled ship, and more specifically, to an ammonia-fueled ship capable of minimizing the generation of carbon dioxide while increasing the temperature of exhaust gas discharged from the main engine.

In general, various engines installed on ships generate power by burning fossil fuels, and exhaust gases generated during the combustion process of fuel contain nitrogen oxides, sulfur oxides, carbon dioxide, etc. As air pollution due to pollutants contained in exhaust gases increases, there is a demand for the development of eco-friendly ships that generate power using low-carbon or decarbonized fuels. Ammonia, which does not emit carbon dioxide when burned, is one of the next-generation eco-friendly fuels. It is emerging. Ammonia does not emit carbon dioxide when burned, but has the problem of generating nitrogen oxides, nitrous oxide, and ammonia slip, which is unburned ammonia. Nitrogen oxide is an air pollutant that causes plant death and acid rain, nitrous oxide is a greenhouse gas that causes global warming, and ammonia slip is a toxic substance that requires treatment.

Meanwhile, the exhaust gas discharged from the combustion of ammonia in the main engine is lower than the temperature required in the selective catalytic reduction reactor that reduces nitrous oxide and nitrogen oxides, so it is necessary to supply it at an increased temperature. Conventionally, the temperature was increased by heat exchanging the exhaust gas discharged from the main engine with the exhaust gas discharged from the heating boiler, but there is a problem in that carbon dioxide is generated as the heating boiler burns fossil fuel.

Republic of Korea Patent Publication No. 10-2022-0034270 (2022.03.18.)

The technical problem to be achieved by the present invention is to provide an ammonia-fueled ship that can minimize the generation of carbon dioxide while increasing the temperature of the exhaust gas discharged from the main engine.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

An ammonia fuel ship according to an embodiment of the present invention for achieving the above technical problem includes a hull, a fuel tank installed on the hull and storing liquid ammonia, and a first fuel supply pipe connected to the fuel tank to supply liquid ammonia or A main engine that receives and burns ammonia generated by vaporizing the liquid ammonia to generate power, and nitrous oxide and nitrogen oxides installed on the first exhaust pipe connected to the main engine and contained in the exhaust gas discharged from the main engine. , a first post-treatment device that reduces at least one of ammonia slip, a boiler that receives the liquid ammonia or the ammonia from a second fuel supply pipe connected to the fuel tank and burns it to generate steam, and a second device connected to the boiler. A second after-treatment device installed on the exhaust pipe to reduce at least one of nitrous oxide, nitrogen oxide, and ammonia slip contained in the exhaust gas discharged from the boiler, and a heat medium flows therein, and a rear end of the second after-treatment device It includes a heat exchange line that recovers heat from the second exhaust pipe and provides it to the first exhaust pipe in front of the first post-processing device.

The first post-processing device and the second post-processing device are installed at a rear end of the selective catalytic reduction reactor for nitrous oxide and the selective catalytic reduction reactor for nitrous oxide to reduce the nitrous oxide into nitrogen and oxygen, respectively, to reduce the nitrogen oxides. It may include a selective catalytic reduction reactor for nitrogen oxides that reduces nitrogen oxides to nitrogen and water, and an oxidation catalyst reactor installed after the selective catalytic reduction reactor for nitrogen oxides to oxidize the ammonia slip into nitrogen and water.

The ammonia fuel ship includes a first reducing agent supply pipe for supplying the liquid ammonia or the ammonia from the fuel tank to the selective catalytic reduction reactor for nitrous oxide, and a first reducing agent supply pipe for supplying the liquid ammonia or the ammonia from the fuel tank to the selective catalytic reduction reactor for nitrogen oxide. It may further include a second reducing agent supply pipe supplied to the catalytic reduction reactor.

The selective catalytic reduction reactor for nitrous oxide includes at least one of cobalt (Co), rhodium (Rh), and cerium-cobalt complex oxide (Ce-Co-O) supported on a carrier made of aluminum oxide (Al ₂ O ₃ ). It may include a catalyst, or a catalyst in which rhodium (Rh) is supported on a carrier made of aluminum oxide (Zn-Al ₂ O ₃ ) impregnated with zinc, or a catalyst in which iron (Fe) is supported on a carrier made of zeolite. You can.

The oxidation catalyst reactor is a carrier made of any one of aluminum oxide (Al ₂ O ₃ ), titanium dioxide (TiO ₂ ), and zirconium oxide (ZrO ₂ ), platinum (Pt), rhodium (Rh), copper (Cu), It may include an oxidation catalyst carrying at least one of palladium (Pd).

The selective catalytic reduction reactor for nitrous oxide, the selective catalytic reduction reactor for nitrogen oxides, and the oxidation catalytic reactor may be formed with catalyst filters arranged in series within one carrier.

The ammonia fuel vessel may further include an exhaust gas circulation pipe that branches off from the second exhaust pipe at the rear end of the heat exchange line and circulates the exhaust gas discharged from the boiler to the air supply pipe of the boiler.

According to the present invention, the main engine and boiler fueled by liquid ammonia or ammonia are operated to exchange heat with the exhaust gas discharged from the main engine, thereby increasing the temperature of the exhaust gas discharged from the main engine. This can minimize the generation of carbon dioxide. In particular, heat at the rear of the second after-processing device installed on the second exhaust pipe of the boiler is recovered and provided to the front end of the first after-processing device installed on the first exhaust pipe of the main engine, so it is included in the exhaust gas from the first after-processing device. Not only can nitrous oxide, nitrogen oxides, and ammonia slip contained in the exhaust gas be easily removed in the second post-treatment device.

1 is a diagram illustrating an ammonia-fueled ship according to an embodiment of the present invention.
Figure 2 is an enlarged view of the selective catalytic reduction reactor for nitrous oxide of Figure 1.
Figure 3 is an operational diagram for explaining the operation of an ammonia fuel ship.
Figure 4 is a diagram showing an ammonia fuel ship according to another embodiment of the present invention.
Figure 5 is an operational diagram for explaining the operation of an ammonia fuel ship according to another embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to be understood by those skilled in the art. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, with reference to FIGS. 1 to 3, an ammonia-fueled ship according to an embodiment of the present invention will be described in detail.

The ammonia fuel ship according to an embodiment of the present invention is a ship that uses ammonia as fuel. For example, ammonia can be supplied as fuel to the main engine and boiler to generate propulsion, electricity, steam, etc.

Ammonia-fueled ships operate main engines and boilers fueled by liquid ammonia or ammonia, and heat exchange the exhaust gas discharged from the main engine with the exhaust gas discharged from the boiler, thereby increasing the temperature of the exhaust gas discharged from the main engine. The generation of carbon dioxide can be minimized. In particular, heat at the rear of the second after-processing device installed on the second exhaust pipe of the boiler is recovered and provided to the front end of the first after-processing device installed on the first exhaust pipe of the main engine, so it is included in the exhaust gas from the first after-processing device. Not only can nitrous oxide, nitrogen oxides, and ammonia slip contained in the exhaust gas be easily removed, but also the second post-processing device has the feature that nitrous oxide, nitrogen oxides, and ammonia slip contained in the exhaust gas can be easily removed.

Hereinafter, with reference to FIGS. 1 and 2, the ammonia fuel ship 1 will be described in more detail.

FIG. 1 is a diagram illustrating an ammonia-fueled ship according to an embodiment of the present invention, and FIG. 2 is an enlarged diagram illustrating the selective catalytic reduction reactor for nitrous oxide of FIG. 1.

The ammonia fuel ship (1) according to the present invention includes a hull (10), a fuel tank (20), a main engine (30), a first after-processing device (40), a boiler (50), and a second after-processing device (60). , and a heat exchange line 70.

The hull 10 forms the external shape of the ammonia fuel ship 1, and the outer surface is formed in a streamlined shape to minimize resistance due to seawater. The hull 10 is propelled by power generated from the main engine 30, which will be described later, and at least one fuel tank 20 is installed therein.

The fuel tank 20 is a tank that stores liquid ammonia and may be formed as a membrane-type normal pressure tank in which the internal pressure is maintained constant. Liquid ammonia or ammonia stored in the fuel tank 20 can be supplied to the main engine 30 and the boiler 50, respectively.

The main engine 30 receives liquid ammonia or ammonia generated by vaporizing liquid ammonia from the first fuel supply pipe 31 connected to the fuel tank 20 and burns it to generate power. For example, it may be an ammonia engine. there is. Hereinafter, the structure in which the main engine 30 receives liquid ammonia and burns it to generate power will be described in more detail. One end of the first fuel supply pipe (31) penetrates the fuel tank (20) and is connected to the low pressure pump (21) installed inside the fuel tank (20), and the other end extends outside the fuel tank (20) to operate the main engine (30). ) can be connected to. Since a boosting pump 32 for pressurizing liquid ammonia or ammonia and a first heater 33 for heating the liquid ammonia or ammonia are installed on the first fuel supply pipe 31, the liquid ammonia or ammonia is pressurized and heated and then returned to the main It can be supplied to the engine 30. For example, the first heater 33 may heat liquid ammonia or ammonia through heat exchange with at least one of sea water, fresh water, and glycol water. In the drawing, a single boosting pump 32 and a first heater 33 are installed on the first fuel supply pipe 31, and the first heater 33 is shown as being disposed at the rear of the boosting pump 32. It is not limited, and the number and arrangement of the boosting pump 32 and the first heater 33 may be modified as needed. Since the main engine 30 generates power by burning liquid ammonia or ammonia, no carbon dioxide is generated and can satisfy the International Maritime Organization's carbon dioxide emission regulations.

The exhaust gas generated from the main engine 30 is discharged to the first exhaust pipe 41 connected to the main engine 30, and at least one of nitrous oxide, nitrogen oxide, and ammonia slip contained in the exhaust gas is disposed on the first exhaust pipe 41. A first post-processing device 40 that reduces one may be installed. The first post-processing device 40 will be described in more detail later.

The boiler 50 receives liquid ammonia or ammonia from the second fuel supply pipe 51 connected to the fuel tank 20 and burns it to generate steam. For example, it may be an ammonia boiler. Hereinafter, the structure in which the boiler 50 receives liquid ammonia and burns it to generate steam will be described in more detail. One end of the second fuel supply pipe 51 penetrates the fuel tank 20 and is connected to the low pressure pump 21 installed inside the fuel tank 20, and the other end extends outside the fuel tank 20 to connect to the boiler 50. can be connected to A second heater 52 is installed on the second fuel supply pipe 51 to heat liquid ammonia or ammonia, and the second heater 52 heats liquid ammonia or ammonia through heat exchange with at least one of seawater, fresh water, and glycol water. It can be heated. In the drawing, one end of the second fuel supply pipe 51 joins the first fuel supply pipe 31 and is connected to the low pressure pump 21, and a single second heater 52 is installed on the second fuel supply pipe 51. Although shown, it is not limited to this, and the number of second heaters 52 may be added or subtracted as needed. Since the boiler 50 generates steam by burning liquid ammonia or ammonia, no carbon dioxide is generated, thereby satisfying the International Maritime Organization's carbon dioxide emission regulations.

The exhaust gas generated in the boiler 50 is discharged to the second exhaust pipe 61 connected to the boiler 50, and at least one of nitrous oxide, nitrogen oxide, and ammonia slip contained in the exhaust gas is discharged on the second exhaust pipe 61. A second post-processing device 60 that reduces oxidation may be installed.

The above-described first post-processing device 40 and the second post-processing device 60 include a selective catalytic reduction reactor for nitrous oxide (40a, 60a), a selective catalytic reduction reactor for nitrogen oxide (40b, 60b), and It may include an oxidation catalyst reactor (40c, 60c).

The selective catalytic reduction reactor (40a, 60a) for nitrous oxide is formed as a catalytic reactor that reduces nitrous oxide contained in exhaust gas to nitrogen and oxygen using liquid ammonia or ammonia as a reducing agent, and uses liquid ammonia or ammonia as a reducing agent to reduce nitrous oxide contained in exhaust gas to nitrogen and oxygen. Nitrous oxide can be reduced to nitrogen and oxygen by passing it through a catalyst filter installed in the reactor. As shown in FIG. 2, the catalyst filter may be formed in a honeycomb structure or a plate structure, and at least one may be installed inside the reactor. The catalytic filter is a catalyst in which at least one of cobalt (Co), rhodium (Rh), and cerium-cobalt composite oxide (Ce-Co-O) is supported on a carrier made of aluminum oxide (Al ₂ O ₃ ), or impregnated with zinc. It may include a catalyst in which rhodium (Rh) is supported on a carrier made of aluminum oxide (Zn-Al ₂ O ₃ ), or a catalyst in which iron (Fe) is supported on a carrier made of zeolite. The selective catalytic reduction reactors (40a, 60a) for nitrous oxide may be connected to one side of the first reducing agent supply pipes (80a, 80b) for supplying liquid ammonia or ammonia. The first reducing agent supply pipes (80a, 80b) can supply liquid ammonia or ammonia generated by vaporizing liquid ammonia from the fuel tank (20) to the selective catalytic reduction reactors (40a, 60a) for nitrous oxide. Hereinafter, the structure in which the first reducing agent supply pipes (80a, 80b) supply ammonia inside the fuel tank (20) to the selective catalytic reduction reactors (40a, 60a) for nitrous oxide will be described in more detail. As described above, if the fuel tank 20 is formed as an atmospheric pressure tank, there is an advantage in reducing tank design cost and weight, but the internal pressure is not high, so liquid ammonia can easily vaporize naturally. Alternatively, liquid ammonia may naturally vaporize due to sloshing or the like. Ammonia produced by vaporization of liquid ammonia causes various problems, such as increasing the pressure inside the tank and promoting vaporization of liquid ammonia, so it is discharged through the first reducing agent supply pipes (80a, 80b) and used in the selective catalytic reduction reactor for nitrous oxide ( It can be supplied in sizes 40a and 60a). Selective catalytic reduction reactors (40b, 60b) for nitrogen oxide may be installed at the rear of the selective catalytic reduction reactors (40a, 60a) for nitrous oxide. Since the reduction reaction temperature of nitrous oxide is higher than the reduction reaction temperature of nitrogen oxides, the selective catalytic reduction reactors (40b, 60b) for nitrogen oxides can be installed at the rear of the selective catalytic reduction reactors (40a, 60a) for nitrous oxide.

The selective catalytic reduction reactor for nitrogen oxides (40b, 60b) is formed as a catalytic reactor that reduces nitrogen oxides contained in exhaust gas to nitrogen and water using liquid ammonia or ammonia as a reducing agent, and exhaust gas mixed with liquid ammonia or ammonia is sent to the reactor. It can be reduced to nitrogen oxides and water by passing it through a catalyst filter installed in the . The catalyst filter may be formed in a honeycomb structure or a plate structure, and at least one may be installed inside the reactor. Since the selective catalytic reduction reactors (40b, 60b) for nitrogen oxides that reduce nitrogen oxides are known technologies, a detailed description of the catalyst filter will be omitted. The selective catalytic reduction reactors for nitrogen oxides (40b, 60b) may be connected to one side of the second reducing agent supply pipes (90a, 90b) for supplying liquid ammonia or ammonia. The second reducing agent supply pipes (90a, 90b) can supply liquid ammonia or ammonia generated by vaporization of liquid ammonia from the fuel tank (20) to the selective catalytic reduction reactors (40b, 60b) for nitrogen oxides. Hereinafter, the structure in which the second reducing agent supply pipes (90a, 90b) supply ammonia inside the fuel tank (20) to the selective catalytic reduction reactors (40b, 60b) for nitrogen oxides will be described in more detail. Oxidation catalyst reactors (40c, 60c) may be installed at the rear of the selective catalytic reduction reactors (40b, 60b) for nitrogen oxides. The selective catalytic reduction reactors (40a, 60a) for nitrous oxide and the selective catalytic reduction reactors (40b, 60b) for nitrogen oxides respectively use liquid ammonia or ammonia as a reducing agent. Therefore, the ammonia slip contained in the exhaust gas is used as a reducing agent in the selective catalytic reduction reactor for nitrous oxide (40a, 60a) or the selective catalytic reduction reactor for nitrogen oxide (40b, 60b), and the remaining ammonia slip is used as a reducing agent in the oxidation catalyst reactor (40c). , can be processed in 60c).

The oxidation catalyst reactors (40c, 60c) are formed as catalytic reactors that oxidize ammonia slip into nitrogen and water, and at least one catalyst filter formed in a honeycomb structure or plate structure may be installed inside the reactor. The catalyst filter is a carrier made of aluminum oxide (Al ₂ O ₃ ), titanium dioxide (TiO ₂ ), or zirconium oxide (ZrO ₂ ), and platinum (Pt), rhodium (Rh), copper (Cu), or palladium (Pd). ) may include at least one supported oxidation catalyst.

A first post-treatment device 40 including a selective catalytic reduction reactor for nitrous oxide (40a), a selective catalytic reduction reactor for nitrogen oxides (40b), and an oxidation catalyst reactor (40c) is installed on the first exhaust pipe 41. and a second post-treatment device 60 including a selective catalytic reduction reactor for nitrous oxide (60a), a selective catalytic reduction reactor for nitrogen oxides (60b), and an oxidation catalyst reactor (60c) on the second exhaust pipe 61. By being installed, it is possible to reduce all nitrous oxide, nitrogen oxides, and ammonia slip contained in the exhaust gas discharged from the main engine 30 and the boiler 50, respectively, thereby satisfying emission regulations.

Meanwhile, the exhaust gas discharged from the boiler 50 is sufficiently higher than the temperature required in the selective catalytic reduction reactor for nitrous oxide (60a) and the selective catalytic reduction reactor for nitrogen oxides (60b), so there is no need to separately increase the temperature and supply it. Since the exhaust gas discharged from the main engine 30 is lower than the temperature required in the selective catalytic reduction reactor for nitrous oxide (40a) and the selective catalytic reduction reactor for nitrogen oxides (40b), it is necessary to supply it at an increased temperature. To this end, A heat exchange line 70 can be placed. The heat exchange line 70 can recover heat from the second exhaust pipe 61 at the rear of the second post-processing device 60 and provide it to the first exhaust pipe 41 at the front of the first post-processing device 40. More specifically, the heat exchange line 70 constitutes a closed loop independent cycle in which a heat medium flows inside, and a first heat exchanger 71 that exchanges heat with the first exhaust pipe 41 in front of the first post-processing device 40. And, the heat of the second exhaust pipe 61 can be provided to the first exhaust pipe 41, including the second heat exchanger 72 that exchanges heat with the second exhaust pipe 61 at the rear end of the second post-processing device 60. there is. That is, the heat medium inside the heat exchange line 70 exchanges heat with the exhaust gas flowing through the second exhaust pipe 61 in the second heat exchanger 72, cools the exhaust gas in the second exhaust pipe 61, and maintains the heated state. The first heat exchanger (71) exchanges heat with the exhaust gas flowing through the first exhaust pipe (41) to heat the exhaust gas in the first exhaust pipe (41), and then circulates in a cooled state back to the first heat exchanger (71). do. The heat exchange line 70 recovers heat from the second exhaust pipe 61 at the rear of the second post-processing device 60 and provides it to the first exhaust pipe 41 at the front of the first post-processing device 40, thereby generating the main engine ( The temperature of the exhaust gas discharged from 30) and supplied to the selective catalytic reduction reactor for nitrous oxide (40a) and the selective catalytic reduction reactor for nitrogen oxides (40b) can be increased, and as a result, the exhaust gas discharged from the main engine (30) can be increased. Nitrous oxide and nitrogen oxides contained in the gas can be easily removed. In particular, since the waste heat of exhaust gas is utilized, the ship can be operated economically as no additional energy or costs are consumed. However, the heat exchange line 70 is limited to indirect heat exchange with the exhaust gas in the first exhaust pipe 41 and the second exhaust pipe 61, including the first heat exchanger 71 and the second heat exchange line 72. No, if necessary, heat may be exchanged directly with the exhaust gas in the first exhaust pipe 41 and the second exhaust pipe 61.

Hereinafter, with reference to FIG. 3, the operation of the ammonia fuel vessel 1 will be described in more detail.

Figure 3 is an operational diagram for explaining the operation of an ammonia fuel ship.

The ammonia-fueled ship (1) according to the present invention operates the main engine (30) and boiler (50) fueled by liquid ammonia or ammonia, and discharges the exhaust gas discharged from the main engine (30) from the boiler (50). Since heat is exchanged with the exhausted exhaust gas, the temperature of the exhaust gas discharged from the main engine 30 can be increased while the generation of carbon dioxide can be minimized. In particular, the first post-processing device installed on the first exhaust pipe 41 of the main engine 30 recovers heat from the rear end of the second post-processing device 60 installed on the second exhaust pipe 61 of the boiler 50. (40) Since it is provided at the front end, nitrous oxide, nitrogen oxides, and ammonia slip contained in the exhaust gas are easily removed in the first after-treatment device (40), and are also included in the exhaust gas in the second after-treatment device (60). Nitrous oxide, nitrogen oxides, and ammonia slip can be easily removed.

Referring to FIG. 3, the liquid ammonia stored in the fuel tank 20 is pressurized by the low pressure pump 21 and flows into the first fuel supply pipe 31 and the second fuel supply pipe 51, respectively, and flows into the fuel tank 20. The ammonia generated by vaporizing the liquid ammonia stored in flows into the first reducing agent supply pipes (80a, 80b) and the second reducing agent supply pipes (90a, 90b), respectively.

Liquid ammonia flowing into the second fuel supply pipe 51 is heated in the second heater 52 and then supplied to the boiler 50, and the boiler 50 burns the liquid ammonia to generate steam. The exhaust gas resulting from the combustion of liquid ammonia in the boiler 50 is discharged through the second exhaust pipe 61 and supplied to the selective catalytic reduction reactor for nitrous oxide (60a), and the selective catalytic reduction reactor for nitrous oxide (60a) is 1 Using ammonia supplied through the reducing agent supply pipe (80b) as a reducing agent, nitrous oxide is reduced to nitrogen and oxygen. The exhaust gas from which nitrous oxide has been removed is supplied to the selective catalytic reduction reactor for nitrogen oxides (60b), and the selective catalytic reduction reactor for nitrogen oxides (60b) uses ammonia supplied through the second reducing agent supply pipe (90b) as a reducing agent to produce nitrogen. Reduces oxides to nitrogen and water. The exhaust gas from which nitrogen oxides have been removed is supplied to the oxidation catalyst reactor (60c), which oxidizes the ammonia slip into nitrogen and water. The exhaust gas from which nitrous oxide, nitrogen oxides, and ammonia slip have been removed is cooled in the second heat exchanger 72 through heat exchange with the heat medium flowing through the heat exchange line 70 and then discharged into the atmosphere. The heat medium heated by heat exchange with the exhaust gas in the second heat exchanger (72) moves to the first heat exchanger (71).

The liquid ammonia flowing into the first fuel supply pipe (31) passes through the booster pump (32) and the first heater (33), is pressurized and heated, and is then supplied to the main engine (30). The main engine (30) produces liquid ammonia. It generates power by burning. The exhaust gas resulting from the combustion of liquid ammonia in the main engine 30 is discharged through the first exhaust pipe 41 and heated through heat exchange with the heat medium flowing through the heat exchange line 70 in the first heat exchanger 71. 1 The heat medium cooled by heat exchange with the exhaust gas in the heat exchanger (71) moves back to the second heat exchanger (72). The exhaust gas heated in the first heat exchanger (71) is supplied to the selective catalytic reduction reactor (40a) for nitrous oxide, and the selective catalytic reduction reactor (40a) for nitrous oxide is supplied with ammonia through the first reducing agent supply pipe (80a). is used as a reducing agent to reduce nitrous oxide to nitrogen and oxygen. The exhaust gas from which nitrous oxide has been removed is supplied to the selective catalytic reduction reactor for nitrogen oxides (40b), and the selective catalytic reduction reactor for nitrogen oxides (40b) uses ammonia supplied through the second reducing agent supply pipe (90a) as a reducing agent to produce nitrogen. Reduces oxides to nitrogen and water. The exhaust gas from which nitrogen oxides have been removed is supplied to the oxidation catalyst reactor (40c), which oxidizes the ammonia slip into nitrogen and water. The exhaust gas from which nitrous oxide, nitrogen oxides, and ammonia slip have been removed is discharged into the atmosphere through the first exhaust pipe 41.

Hereinafter, with reference to FIG. 4, the ammonia fuel ship 1-1 according to another embodiment of the present invention will be described in more detail.

Figure 4 is a diagram showing an ammonia fuel ship according to another embodiment of the present invention.

The ammonia fuel ship (1-1) according to another embodiment of the present invention includes a selective catalytic reduction reactor (40a, 60a) for nitrous oxide, a selective catalytic reduction reactor (40b, 60b) for nitrogen oxide, and an oxidation catalyst reactor (40c). , 60c) is formed by catalytic filters arranged in series inside one enclosure. The ammonia fuel ship (1-1) according to another embodiment of the present invention includes a selective catalytic reduction reactor (40a, 60a) for nitrous oxide, a selective catalytic reduction reactor (40b, 60b) for nitrogen oxide, and an oxidation catalyst reactor (40c). , 60c) is substantially the same as the above-described embodiment, except that the catalyst filters are arranged in series inside one enclosure. Therefore, this will be mainly explained, but unless otherwise stated, the description of the remaining components will be replaced by the above-mentioned details.

Referring to FIG. 4, the selective catalytic reduction reactors (40a, 60a) for nitrous oxide, the selective catalytic reduction reactors (40b, 60b) for nitrogen oxides, and the oxidation catalyst reactors (40c, 60c) are installed inside a single enclosure with a catalyst filter. Can be formed by being arranged in series. More specifically, inside the enclosure installed on the first exhaust pipe 41, a catalyst filter of the selective catalytic reduction reactor for nitrous oxide (40a), a catalyst filter of the selective catalytic reduction reactor for nitrogen oxides (40b), and an oxidation catalyst reactor ( The catalytic filters of 40c) are arranged in series, and the first reducing agent supply pipe (80a) and the second reducing agent supply pipe (90a) are located in front of the catalyst filter of the selective catalytic reduction reactor (40a) for nitrous oxide and selective catalytic reduction for nitrogen oxides, respectively. It is connected to the front of the catalyst filter of the reactor (40b) and can supply a reducing agent. In addition, inside the enclosure installed on the second exhaust pipe 61, a catalyst filter of the selective catalytic reduction reactor for nitrous oxide (60a), a catalyst filter of the selective catalytic reduction reactor for nitrogen oxides (60b), and an oxidation catalyst reactor (60c) The catalytic filters are arranged in series, and the first reducing agent supply pipe (80b) and the second reducing agent supply pipe (90b) are located in front of the catalyst filter of the selective catalytic reduction reactor for nitrous oxide (60a) and the selective catalytic reduction reactor for nitrogen oxide (60a), respectively. It is connected to the front of the catalyst filter of 60b) and can supply a reducing agent. In this way, the selective catalytic reduction reactors (40a, 60a) for nitrous oxide, the selective catalytic reduction reactors (40b, 60b) for nitrogen oxides, and the oxidation catalyst reactors (40c, 60c) have catalyst filters arranged in series inside one enclosure. By being formed, it is possible to effectively reduce nitrous oxide, nitrogen oxides, and ammonia slip contained in exhaust gas while increasing space utilization within the ship.

Hereinafter, with reference to FIG. 5, the ammonia fuel ship 1-2 according to another embodiment of the present invention will be described in more detail.

Figure 5 is an operational diagram for explaining the operation of an ammonia fuel ship according to another embodiment of the present invention.

The ammonia fuel vessel (1-2) according to another embodiment of the present invention has an exhaust gas circulation pipe (62) branched from the second exhaust pipe (61) at the rear end of the heat exchange line (70) and an air supply pipe of the boiler (50). 53). The ammonia fuel vessel (1-2) according to another embodiment of the present invention has an exhaust gas circulation pipe (62) branched from the second exhaust pipe (61) at the rear end of the heat exchange line (70) and an air supply pipe of the boiler (50). Except for being connected to 53), it is substantially the same as the above-described embodiment. Therefore, this will be mainly explained, but unless otherwise stated, the description of the remaining components will be replaced by the above-mentioned details.

An exhaust gas circulation pipe (62) is branched from the second exhaust pipe (61) at the rear end of the heat exchange line (70), and the exhaust gas circulation pipe (62) is connected to the air supply pipe (53) of the boiler (50). Some of the exhaust gas discharged from can be circulated through the air supply pipe (53). Since the exhaust gas flowing through the second exhaust pipe 61 at the rear end of the heat exchange line 70 is cooled through heat exchange with the heat medium inside the heat exchange line 70, it is supplied to the air supply pipe 53 through the exhaust gas circulation pipe 62. When circulated, the temperature of the combustion chamber of the boiler 50 is lowered and the generation of nitrogen oxides can be suppressed. In other words, even if a separate cooler is not installed on the exhaust gas circulation pipe 62, cooled exhaust gas can be circulated to the air supply pipe 53, thereby reducing costs associated with installation and maintenance of the cooler.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. You will be able to understand it. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

1: Ammonia fueled ships
10: Hull 20: Fuel tank
21: low pressure pump 30: main engine
31: first fuel supply pipe 32: boosting pump
33: first heater 40: first post-processing device
40a: Selective catalytic reduction reactor for nitrous oxide
40b: Selective catalytic reduction reactor for nitrogen oxides
40c: Oxidation catalyst reactor
41: first exhaust pipe 50: boiler
51: second fuel supply pipe 52: second heater
53: air supply pipe 60: second post-processing device
60a: Selective catalytic reduction reactor for nitrous oxide
60b: Selective catalytic reduction reactor for nitrogen oxides
60c: Oxidation catalyst reactor
61: second exhaust pipe 62: exhaust gas circulation pipe
70: heat exchange line 71: first heat exchanger
72: Second heat exchanger

Claims (7)

hull;
A fuel tank installed on the hull and storing liquid ammonia;
A main engine that receives the liquid ammonia or ammonia generated by vaporizing the liquid ammonia from a first fuel supply pipe connected to the fuel tank and combusts it to generate power;
a first post-treatment device installed on the first exhaust pipe connected to the main engine to reduce at least one of nitrous oxide, nitrogen oxide, and ammonia slip contained in the exhaust gas discharged from the main engine;
A boiler that receives the liquid ammonia or the ammonia from a second fuel supply pipe connected to the fuel tank and combusts it to generate steam;
A second post-treatment device installed on the second exhaust pipe connected to the boiler to reduce at least one of nitrous oxide, nitrogen oxide, and ammonia slip contained in the exhaust gas discharged from the boiler, and
An ammonia fuel vessel in which a heat medium flows, and including a heat exchange line for recovering heat from the second exhaust pipe at the rear of the second post-processing device and providing the heat to the first exhaust pipe at the front of the first post-processing device. The method of claim 1, wherein the first post-processing device and the second post-processing device each have:
A selective catalytic reduction reactor for nitrous oxide that reduces the nitrous oxide into nitrogen and oxygen,
A selective catalytic reduction reactor for nitrogen oxides installed at a rear end of the selective catalytic reduction reactor for nitrous oxide to reduce the nitrogen oxides to nitrogen and water, and
An ammonia fuel ship comprising an oxidation catalyst reactor installed at a rear end of the selective catalytic reduction reactor for nitrogen oxides to oxidize the ammonia slip into nitrogen and water. According to clause 2,
a first reducing agent supply pipe supplying the liquid ammonia or the ammonia from the fuel tank to the selective catalytic reduction reactor for nitrous oxide;
An ammonia fuel vessel further comprising a second reducing agent supply pipe for supplying the liquid ammonia or the ammonia from the fuel tank to the selective catalytic reduction reactor for nitrogen oxides. The method of claim 3, wherein the selective catalytic reduction reactor for nitrous oxide,
A catalyst containing at least one of cobalt (Co), rhodium (Rh), and cerium-cobalt composite oxide (Ce-Co-O) supported on a carrier made of aluminum oxide (Al ₂ O ₃ ), or aluminum oxide impregnated with zinc ( An ammonia fuel vessel comprising a catalyst in which rhodium (Rh) is supported on a carrier made of Zn-Al ₂ O ₃ ), or a catalyst in which iron (Fe) is supported on a carrier made of zeolite. The method of claim 3, wherein the oxidation catalyst reactor,
At least one of platinum (Pt), rhodium (Rh), copper (Cu), and palladium (Pd) is added to a carrier made of aluminum oxide (Al _{2 O 3} ), titanium dioxide (TiO ₂ ), and zirconium oxide (ZrO 2 ). An ammonia-fueled vessel containing one supported oxidation catalyst. According to clause 3,
An ammonia fuel ship wherein the selective catalytic reduction reactor for nitrous oxide, the selective catalytic reduction reactor for nitrogen oxides, and the oxidation catalytic reactor are formed by catalytic filters arranged in series inside one carrier. According to claim 1,
An ammonia fuel vessel further comprising an exhaust gas circulation pipe branched from the second exhaust pipe at the rear end of the heat exchange line and circulating the exhaust gas discharged from the boiler to the air supply pipe of the boiler.

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