Drainage treatment device

Abstract

Provided is a blowdown treatment device capable of effectively utilizing ammonia components of ammonia-containing blowdown recovered from a fuel injection system of a marine diesel engine. A blowdown treatment device of one embodiment includes a recovery portion that communicates with a fuel injection system for injecting ammonia fuel and fossil fuel into a combustion chamber of a marine diesel engine, and recovers ammonia-containing blowdown discharged from the fuel injection system, and a supply portion that supplies ammonia components contained in the recovered ammonia-containing blowdown to one or more functional portions that function using the ammonia components.

Description

TECHNICAL FIELD

[0001] The present application relates to a drain treatment device for a marine diesel engine. BACKGROUND

[0002] In recent years, in the field of ships, as one of the methods for reducing the amount of greenhouse gases (GHG) emitted from a marine diesel engine, there is an ammonia mixed combustion technique. The ammonia mixed combustion technique is a technique in which a fossil fuel such as heavy oil, which has been used as a fuel for a ship, and an ammonia fuel, which does not produce carbon dioxide (one of GHG) even if it is burned, are injected into a combustion chamber of a marine diesel engine and burned together. Thereby, it is possible to reduce the content of carbon dioxide contained in exhaust gas from the marine diesel engine (that is, the amount of carbon dioxide emitted).

[0003] In a marine diesel engine that adopts such an ammonia mixed combustion technique, generally, a drain containing an ammonia fuel (hereinafter referred to as an ammonia-containing drain) is discharged from a fuel injection valve or the like that injects a fossil fuel and an ammonia fuel into a combustion chamber. Then, the discharged ammonia-containing drain is recovered into a container such as a tank. For example, in Patent Literature 1, a drain system is disclosed in which an ammonia-containing drain (fuel drain) discharged from a fuel injection valve is recovered into a tank through a pipe, and an ammonia component (ammonia gas) volatilized from the recovered ammonia-containing drain to become a gas is incinerated by a boiler.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2021-1591

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] However, in the case where the ammonia component of the recovered ammonia-containing drain is incinerated as described above, although it is possible to treat the harmful ammonia gas without leaking to the outside air, nitrogen oxides (N2O or the like) are generated due to the incineration of the ammonia component. In addition, in order to avoid an increase in the amount of generation of nitrogen oxides (the amount of emission from the ship), in the case where the incineration of the ammonia component is not performed, it is necessary to store the recovered ammonia-containing drain in a closed container in the ship, and finally to unload it from the ship to be treated, and thus, the treatment of the ammonia-containing drain requires a huge cost.

[0009] In recent years, in a marine diesel engine, the demand for reducing the amount of carbon dioxide emission has increased, and in conjunction therewith, there is a demand for effectively utilizing the ammonia component of the above-mentioned recovered ammonia-containing drain. SUMMARY

[0010] The present application has been made in view of the above-described circumstances, and has an object to provide a drain treatment device capable of effectively utilizing ammonia components of ammonia-containing drain recovered from a fuel injection system of a marine diesel engine.

[0011] Technical means for solving the technical problem

[0012] To achieve the object to solve the above-described technical problem, the drain treatment device of the present application includes: a recovery section that communicates with a fuel injection system for injecting ammonia fuel and fossil fuel into a combustion chamber of a marine diesel engine, and recovers ammonia-containing drain discharged from the fuel injection system; and a supply section that supplies an ammonia component contained in the recovered ammonia-containing drain to one or more functional sections that function using the ammonia component.

[0013] In addition, in the above-described application, the drain treatment device of the present application includes: at least one recovery pipe through which mixed drain in which a gas component or an oil component other than the ammonia component is mixed with the ammonia fuel flows; and a recovery tank that recovers the mixed drain from the fuel injection system through the at least one recovery pipe, and accumulates the ammonia-containing drain containing at least one of the gas component and the oil component and the ammonia fuel.

[0014] In addition, in the above-described application, the drain treatment device of the present application includes: a recovery tank that gas-liquid separates the accumulated ammonia-containing drain into ammonia-containing liquid containing the oil component and the ammonia fuel, and ammonia-containing gas containing the gas component and ammonia gas vaporized from the ammonia fuel; a supply section that includes: an extraction section that extracts the ammonia component by removing the oil component from the ammonia-containing liquid; and an aqueous ammonia generation section that adds water to the ammonia-containing gas, separates the gas component and the ammonia gas, and generates aqueous ammonia containing the ammonia component as an aqueous solution of the ammonia gas.

[0015] In addition, in the above-described application, the drain treatment device of the present application includes: one of the one or more functional sections is an exhaust gas treatment device that includes a reactor that removes nitrogen oxides contained in exhaust gas through a reduction reaction of the nitrogen oxides and a reducing agent, a mixer that mixes the exhaust gas and the reducing agent, and a reducing agent supply section that supplies the reducing agent to the mixer, and the supply section supplies the ammonia component extracted by the extraction section to the mixer.

[0016] In addition, in the above-described application, the drain treatment device of the present application includes: the supply section adds the aqueous ammonia generated by the aqueous ammonia generation section to the reducing agent.

[0017] Further, the exhaust fluid treatment device of the present application, in the above-mentioned invention, one of the one or more functional units is a drive system of the diesel engine for the ship, which generates a driving force using energy generated by combustion of the ammonia fuel and the fossil fuel injected into the combustion chamber, and the supply unit injects the aqueous ammonia generated by the aqueous ammonia generation unit into the combustion chamber.

[0018] Further, the exhaust fluid treatment device of the present application, in the above-mentioned invention, the at least one recovery pipe includes a first recovery pipe that recovers a first mixed exhaust fluid in which the fossil fuel and the ammonia fuel are mixed from a fuel injection valve of the fuel injection system.

[0019] Further, the exhaust fluid treatment device of the present application, in the above-mentioned invention, the at least one recovery pipe includes a second recovery pipe that recovers a second mixed exhaust fluid in which lubricating oil of an ammonia pump and the ammonia fuel are mixed from the ammonia pump that pressurizes and feeds the ammonia fuel to the fuel injection valve of the fuel injection system.

[0020] Further, the exhaust fluid treatment device of the present application, in the above-mentioned invention, the at least one recovery pipe includes a third recovery pipe that recovers a third mixed exhaust fluid in which purge gas that purges the inside of a communication pipe and the ammonia fuel are mixed from the communication pipe that communicates the fuel injection valve of the fuel injection system and the ammonia pump that pressurizes and feeds the ammonia fuel to the fuel injection valve.

[0021] Further, the exhaust fluid treatment device of the present application, in the above-mentioned invention, the exhaust fluid containing the ammonia component is aqueous ammonia, and the supply unit supplies the aqueous ammonia to the one or more functional units.

[0022] Further, the exhaust fluid treatment device of the present application, in the above-mentioned invention, the fuel injection system includes a fuel injection valve that injects the ammonia fuel and the fossil fuel into the combustion chamber, an ammonia pump that pressurizes and feeds the ammonia fuel to the fuel injection valve, an ammonia fuel tank that accumulates the ammonia fuel supplied to the ammonia pump, and a double pipe having a first inner pipe that communicates the fuel injection valve and the ammonia pump, a first outer pipe that airtightly covers the first inner pipe, a second inner pipe that communicates the ammonia pump and the ammonia fuel tank, and a second outer pipe that airtightly covers the second inner pipe, and the recovery unit airtightly covers the ammonia pump and communicates with the double pipe to recover the aqueous ammonia from the double pipe.

[0023] Further, the drain treatment device of the present application, in the above-mentioned application, one of the one or more functional sections is a collection tank of an EGR device that cleans a portion of exhaust gas discharged from the marine diesel engine with scrubbing water and returns it to the marine diesel engine, the collection tank accumulates and neutralizes the acidic scrubbing water used for the cleaning, and the supply section supplies the ammonia water to the collection tank.

[0024] Further, the drain treatment device of the present application, in the above-mentioned application, one of the one or more functional sections is a drive system of the marine diesel engine that generates a driving force using energy generated by the mixed combustion of the ammonia fuel and the fossil fuel injected into the combustion chamber, and the supply section injects the ammonia water into the combustion chamber.

[0025] Effects of the Invention

[0026] According to the present application, it is possible to effectively utilize the ammonia component of the ammonia-containing drain recovered from the fuel injection system of the marine diesel engine. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a view showing one configuration example of a drain treatment device of a first embodiment of the present application.

[0028] Figure 2 is a view showing one configuration example of a drain treatment device of a second embodiment of the present application.

[0029] Figure 3 is a view showing one configuration example of a drain treatment device of a third embodiment of the present application.

[0030] Figure 4 is a view showing one configuration example of a drain treatment device of a fourth embodiment of the present application.

[0031] Explanation of Symbols

[0032] 1 marine diesel engine

[0033] 2 drive system

[0034] 2a cylinder

[0035] 2b piston

[0036] 2c combustion chamber

[0037] 2d exhaust valve

[0038] 3 fuel injection system

[0039] 4 fuel injection valve

[0040] 5a fuel pump

[0041] 5b Ammonia pump

[0042] 6 Communication pipe

[0043] 7 Double pipe

[0044] 7a First inner pipe

[0045] 7b First outer pipe

[0046] 7c Second inner pipe

[0047] 7d Second outer pipe

[0048] 8 Ammonia fuel tank

[0049] 9 Purge section

[0050] 9a Purge gas introduction section

[0051] 9b Outlet pipe

[0052] 9c Open and close valve

[0053] 10 Exhaust gas treatment device

[0054] 11 Reactor

[0055] 12 Mixer

[0056] 12a Reducing agent injection section

[0057] 12b Delivery pipe

[0058] 13 Reducing agent supply section

[0059] 14 Reducing agent tank

[0060] 15 Reducing agent pump

[0061] 16, 16A, 17, 18 Supply pipe

[0062] 19 Exhaust pipe

[0063] 20, 20A, 20B, 20C Drain treatment device

[0064] 21, 21A Recovery section

[0065] 22 First recovery pipe

[0066] 23 Second recovery pipe

[0067] 24 Third recovery pipe

[0068] 25 Recovery tank

[0069] 26, 26A, 26B, 26C Supply section

[0070] 27 oxidation reactor

[0071] 28 supply pipe

[0072] 29 pump

[0073] 30 ammonia water production section

[0074] 30a immersion pipe

[0075] 31 introduction pipe

[0076] 32, 32A-1, 32A-2, 32B-1, 32B-2 supply pipe

[0077] 33 pump

[0078] 33A ammonia pump

[0079] 34 confluence valve

[0080] 35, 35A dosing unit

[0081] 36 nitrogen oxide sensor

[0082] 37, 37A control section

[0083] 40 EGR device

[0084] 41 scrubber

[0085] 41a scrubbing water injection section

[0086] 42 mist eliminator

[0087] 42a outflow pipe

[0088] 43 EGR blower

[0089] 44 collection tank

[0090] 45a lye supply section

[0091] 45b fresh water supply section

[0092] 46 pH meter

[0093] 47 control section

[0094] 48 water supply pipe

[0095] 49 pump

[0096] 50 water treatment device

[0097] 60 air exchange system

[0098] 61 air exchange fan

[0099] 62 ventilation pipe

[0100] 63 Ammonia Sensor

[0101] 64. Water spray unit

[0102] 64a water spray nozzle

[0103] 65 Control Department

[0104] 70 Ammonia Injection Valve

[0105] Exhaust pipes 101 and 102

[0106] 101a First Branch Pipe

[0107] 101b Second Branch Pipe

[0108] 103 Inlet circulation pipe

[0109] 104 Outflow circulation pipe

[0110] 200, 200A Ammonia-containing Discharge Liquid

[0111] 201 First Mixed Drainage

[0112] 202 Second Mixed Drainage

[0113] 203 Third Mixed Drainage

[0114] 204 Ammonia-containing liquid

[0115] 205 Ammonia-containing gas

[0116] 206 Mixed Gas

[0117] 207 Ammonia

[0118] 208 Washing water

[0119] 210 Internal Gas Detailed Implementation

[0120] Hereinafter, preferred embodiments of the drainage treatment apparatus of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited by these embodiments. It should also be noted that the drawings are schematic, and the dimensional relationships and proportions of the elements may sometimes differ from reality. The drawings may also include parts with different dimensional relationships or proportions. Furthermore, the same symbols are used to label the same structural parts in the drawings.

[0121] (First Implementation)

[0122] The drainage treatment apparatus of the first embodiment of the present invention will be described. Figure 1is a view showing one configuration example of the liquid discharge treatment device according to the first embodiment of the present application. In Figure 1 the first embodiment of the present application, a marine diesel engine 1 to which the liquid discharge treatment device 20 is applied and an exhaust treatment device 10 applied to the marine diesel engine 1 are illustrated in addition to the liquid discharge treatment device 20. As the exhaust treatment device 10, for example, a selective catalytic reduction (SCR: Selective Catalytic Reduction) device or the like can be cited. Hereinafter, the marine diesel engine 1 and the exhaust treatment device 10 will be described in turn, and then the liquid discharge treatment device 20 will be described.

[0123] (Marine Diesel Engine)

[0124] The marine diesel engine 1 is a propulsion engine (main engine) that drives a propeller shaft to rotate a propeller for propulsion of a ship. Specifically, the marine diesel engine 1 is a two-stroke diesel engine exemplified by a uniflow scavenging exhaust type crosshead type diesel engine, and particularly an ammonia mixed combustion engine that drives mixed combustion of ammonia fuel and fossil fuel. Note that the fossil fuel generally refers to fuel refined from crude oil such as diesel fuel, distillate oil, residual oil, and the like. For example, as shown in Figure 1 , the marine diesel engine 1 is provided with a drive system 2 and a fuel injection system 3.

[0125] The drive system 2 performs mixed combustion of the ammonia fuel and the fossil fuel injected from the fuel injection system 3, and generates driving force using the combustion energy generated thereby. For example, as shown in Figure 1 , the drive system 2 is provided with a cylinder block 2a, a piston 2b, and a combustion chamber 2c. The cylinder block 2a is a cylindrical structure that houses the piston 2b. The combustion chamber 2c of the marine diesel engine 1 is divided inside the cylinder block 2a by the cylinder block 2a and the piston 2b. The piston 2b is configured to be able to reciprocate inside the cylinder block 2a in a state of facing the combustion chamber 2c. Although not particularly illustrated, the lower portion of the piston 2b is linked to a crankshaft via a piston rod, a crosshead, and the like. In addition, as shown in Figure 1 , the drive system 2 is provided with an exhaust valve 2d at the upper portion of the cylinder block 2a. The exhaust valve 2d is a valve that closes an exhaust port of the cylinder block 2a leading to the combustion chamber 2c in an openable and closable manner, and is driven to open and close by a valve actuation device (not shown).

[0126] In addition, one drive system 2 is illustrated in Figure 1 , but the marine diesel engine 1 can be provided with one drive system 2 or a plurality of drive systems 2.

[0127] The fuel injection system 3 is a system for injecting the ammonia fuel and the fossil fuel into the combustion chamber 2c of the marine diesel engine 1. For example, as shown in Figure 1As shown, the fuel injection system 3 includes a fuel injection valve 4, a fuel pump 5a, an ammonia pump 5b, a connecting pipe 6, a double-layer pipe 7, an ammonia fuel tank 8, and a purging unit 9.

[0128] like Figure 1 As shown, the fuel injection valve 4 is disposed in the cylinder block 2a with the injection port facing into the combustion chamber 2c. Although not specifically illustrated, the fuel injection valve 4 has an internal fuel path leading to the injection port. The connecting pipe 6 is a piping that connects the fuel path of the fuel injection valve 4 to the fuel pump 5a. The fuel pump 5a supplies fossil fuel from the fuel tank (not shown) through piping, and the supplied fossil fuel is pressurized to the fuel injection valve 4 through the connecting pipe 6. The pressurized fossil fuel fills the fuel path of the fuel injection valve 4.

[0129] Additionally, the fuel injection valve 4, ammonia pump 5b, and ammonia fuel tank 8 are connected via a double-layered pipe 7. More specifically, as... Figure 1 As shown, the double-walled pipe 7 includes: a first inner pipe 7a connecting the fuel path of the fuel injection valve 4 to the ammonia pump 5b; a first outer pipe 7b that airtightly covers the first inner pipe 7a; a second inner pipe 7c connecting the ammonia pump 5b to the ammonia fuel tank 8; and a second outer pipe 7d that airtightly covers the second inner pipe 7c. The ammonia fuel tank 8 is a tank that stores liquid ammonia as fuel supplied to the ammonia pump 5b, for example, located inside a ship and outside the marine diesel engine 1. The ammonia fuel tank 8 supplies ammonia fuel to the ammonia pump 5b through the second inner pipe 7c of the double-walled pipe 7. For example, as... Figure 1 As shown, the second inner pipe 7c is configured to slope downwards from the ammonia fuel tank 8 toward the ammonia pump 5b. The ammonia fuel tank 8 supplies ammonia fuel to the ammonia pump 5b by gravity from the second inner pipe 7c. The ammonia pump 5b pressurizes the ammonia fuel supplied from the ammonia fuel tank 8 through the first inner pipe 7a of the double-layer pipe 7 to the fuel injection valve 4. The pressurized ammonia fuel is injected into the fossil fuel filling the fuel path of the fuel injection valve 4.

[0130] In the double-walled pipe 7 as described above, the first outer pipe 7b prevents the liquid and gaseous components (hereinafter collectively referred to as ammonia components) of the ammonia fuel pumped from the ammonia pump 5b through the first inner pipe 7a to the fuel injection valve 4 from leaking to the outside of the double-walled pipe 7. The second outer pipe 7d prevents the ammonia components of the ammonia fuel supplied from the ammonia fuel tank 8 to the ammonia pump 5b through the second inner pipe 7c from leaking to the outside of the double-walled pipe 7.

[0131] Here, with fossil fuel and ammonia fuel already filled in its fuel path, fuel injection valve 4 injects the fossil fuel and ammonia fuel from the combustion chamber 2c using the pressure of the fossil fuel re-pressurized from fuel pump 5a. At this time, fuel injection valve 4 injects these fossil fuels and ammonia fuels in a continuous, alternating layered manner, for example. In drive system 2, the fossil fuels and ammonia fuel injected into combustion chamber 2c are mixed with combustion gases (compressed gases) supplied to combustion chamber 2c from the scavenging port (not shown) of cylinder block 2a. Piston 2b reciprocates inside cylinder block 2a due to the combustion energy generated by the mixing of these fossil fuels and ammonia fuels. This generates driving force in drive system 2. Exhaust valve 2d opens the exhaust port of cylinder block 2a, discharging exhaust gases from combustion chamber 2c to the outside of cylinder block 2a. The discharged exhaust gases pass from cylinder block 2a through piping and are temporarily stored in the exhaust manifold (not shown) of marine diesel engine 1.

[0132] The purging section 9 is used to remove residual ammonia fuel inside the first inner pipe 7a of the double-layer pipe 7 when the marine diesel engine 1 is stopped. For example, as... Figure 1 As shown, the purging unit 9 includes a purging gas inlet 9a, an outlet pipe 9b, and an on / off valve 9c. Figure 1 As shown, the purge gas inlet 9a is configured to connect to the vicinity of the connection point with the ammonia pump 5b in the first inner pipe 7a via a piping. The purge gas inlet 9a introduces purge gas into the first inner pipe 7a for purging the interior of the first inner pipe 7a. Examples of this purge gas include nitrogen gas. Additionally, as... Figure 1 As shown, the outlet pipe 9b is configured to connect to the portion of the first inner pipe 7a near the connection point with the fuel injection valve 4. An on / off valve 9c is located midway through the outlet pipe 9b.

[0133] Here, in the event that the marine diesel engine 1 stops (normally) or in an emergency due to operator intervention, the purging unit 9 opens the on / off valve 9c and introduces purging gas from the purging gas inlet 9a into the interior of the first inner pipe 7a. The ammonia fuel remaining inside the first inner pipe 7a is pushed out from the first inner pipe 7a to the outlet pipe 9b by the introduced purging gas. Thus, the ammonia fuel is removed from the interior of the first inner pipe 7a, and then, together with the purging gas, it is discharged from the fuel injection system 3 through the outlet pipe 9b.

[0134] In addition, although Figure 1Although not illustrated, the marine diesel engine 1 includes a ventilation system for ventilating the internal space of the double-walled pipe 7. This ventilation system allows ammonia gas, vaporized from ammonia fuel leaking from at least one of the first inner pipe 7a and the second inner pipe 7c, to be released into the space outside the ship through ventilation. Alternatively, the ventilation system can, during ventilation of the internal space of the double-walled pipe 7, spray water into the ammonia gas drawn from the internal space, thereby converting the ammonia gas into ammonia water, thus preventing ammonia gas from leaking to the outside of the double-walled pipe 7. Furthermore, this ammonia water can be recovered through a drainage treatment device 20 or stored in a designated tank.

[0135] (Waste gas treatment device)

[0136] Exhaust gas treatment device 10 is a device for reducing nitrogen oxides (e.g., NOx, N2O, etc.) in the exhaust gas emitted from the marine diesel engine 1, for example, such as Figure 1 As shown, it includes a reactor 11, a mixer 12, a reducing agent supply unit 13, and an exhaust pipe 19.

[0137] Reactor 11 is composed of a catalytic reactor or the like, such as a catalyst layer. Figure 1 As shown, it is located in the downstream section of mixer 12. Reactor 11 receives the exhaust gas mixed with the reducing agent from mixer 12, and selectively (promotes) the reduction reaction between nitrogen oxides in the received exhaust gas and the reducing agent using a catalyst. Thus, reactor 11 removes nitrogen oxides from the exhaust gas (denitrification), reducing the amount of nitrogen oxides emitted. Examples of nitrogen oxides that are denitrified by reactor 11 include NOx produced by the combustion of fossil fuels, N2O produced by the combustion of ammonia fuels, and N2O produced by the combustion of ammonia components contained in ammonia-containing wastewater recovered from marine diesel engine 1 via the wastewater treatment device 20 (described later). Additionally, such as... Figure 1 As shown, the outlet side of reactor 11 is connected to exhaust pipe 19. Exhaust pipe 19 is a pipe leading to the ship's chimney (not shown), through which the exhaust gas (with reduced nitrogen oxides) from reactor 11 is discharged to the outside of the ship.

[0138] Mixer 12 mixes the exhaust gas with the reducing agent. Specifically, as follows... Figure 1As shown, the mixer 12 has a reductant injection portion 12a inside. In addition, the mixer 12 is connected with a delivery pipe 12b and an exhaust pipe 101, and the reductant injection portion 12a is connected with a supply pipe 18. The mixer 12 communicates with the marine diesel engine 1 (e.g., an exhaust manifold or the like) via the exhaust pipe 101, and receives exhaust gas from the marine diesel engine 1 through the exhaust pipe 101. The reductant injection portion 12a injects reductant supplied from a reductant supply portion 13 into the exhaust gas via the supply pipe 18, and mixes the reductant with the exhaust gas. The mixer 12 delivers the exhaust gas thus mixed with the reductant to the reactor 11 through the delivery pipe 12b.

[0139] The reductant supply portion 13 supplies reductant to the mixer 12. In detail, as shown, Figure 1 the reductant supply portion 13 is provided with a reductant tank 14, a reductant pump 15, and supply pipes 16 to 18. The reductant tank 14 is a tank that stores reductant as a supply object. As the reductant, for example, urea water or the like can be listed. As shown, Figure 1 the supply pipes 16 to 18 are configured to communicate the reductant tank 14 and the reductant injection portion 12a of the mixer 12 via a merging valve 34 and a dosing unit 35. In addition, the merging valve 34 and the dosing unit 35 will be described later. The reductant pump 15 is provided, for example, at a middle portion of the supply pipe 16, and pressurizes and feeds the reductant from the reductant tank 14 to the mixer 12 via the supply pipes 16 to 18 and the like. By the action of the reductant pump 15, the reductant is injected from the reductant injection portion 12a inside the mixer 12.

[0140] (Discharge liquid treatment device)

[0141] The discharge liquid treatment device 20 is a device for utilizing ammonia components of ammonia-containing discharge liquid discharged from the fuel injection system 3 of the marine diesel engine 1 in one or more functional portions. As shown, Figure 1 the discharge liquid treatment device 20 is provided with a recovery portion 21 that recovers ammonia-containing discharge liquid, and a supply portion 26 that supplies ammonia components of the recovered ammonia-containing discharge liquid to one or more functional portions.

[0142] The recovery portion 21 communicates with the fuel injection system 3 of the marine diesel engine 1 described above, and recovers ammonia-containing discharge liquid discharged from the fuel injection system 3. In detail, as shown, Figure 1As shown, the recovery section 21 is provided with at least one recovery pipe through which the mixed discharge liquid from the fuel injection system 3 flows, and a recovery tank 25 that communicates with the at least one recovery pipe. In the first embodiment, the at least one recovery pipe includes, for example, a first recovery pipe 22, a second recovery pipe 23, and a third recovery pipe 24. In addition, the mixed discharge liquid is discharge liquid in which the above-described ammonia fuel and a gas component or an oil component other than the ammonia component are mixed. As the gas component other than the ammonia component, for example, the above-described purge gas or the like can be listed. As the oil component, for example, the above-described fossil fuel, the lubricating oil of the ammonia pump 5b, or the like can be listed.

[0143] The first recovery pipe 22 is an example of the above-described at least one recovery pipe, and is a pipe for recovering the ammonia-containing discharge liquid discharged from the fuel injection valve 4 of the fuel injection system 3. In detail, as shown in FIG. 1, one end portion of the first recovery pipe 22 is connected to the fuel injection valve 4, and the other end portion is connected to the recovery tank 25, and these fuel injection valve 4 and the recovery tank 25 are communicated. The first recovery pipe 22 recovers the first mixed discharge liquid 201 from the fuel injection valve 4, and causes the recovered first mixed discharge liquid 201 to flow into the inside of the recovery tank 25. The first mixed discharge liquid 201 is discharge liquid in which the fossil fuel and the ammonia fuel are mixed and discharged from the fuel injection valve 4. Figure 1

[0144] The second recovery pipe 23 is an example of the above-described at least one recovery pipe, and is a pipe for recovering the ammonia-containing discharge liquid discharged from the ammonia pump 5b of the fuel injection system 3. In detail, as shown in FIG. 1, one end portion of the second recovery pipe 23 is connected to the ammonia pump 5b, and the other end portion is connected to the recovery tank 25, and these ammonia pump 5b and the recovery tank 25 are communicated. The second recovery pipe 23 recovers the second mixed discharge liquid 202 from the ammonia pump 5b, and causes the recovered second mixed discharge liquid 202 to flow into the inside of the recovery tank 25. The second mixed discharge liquid 202 is discharge liquid in which the lubricating oil and the ammonia fuel are mixed and discharged from the ammonia pump 5b. Figure 1

[0145] The third recovery pipe 24 is an example of the above-described at least one recovery pipe, and is a pipe for recovering the ammonia-containing discharge liquid discharged from the purge section 9 of the fuel injection system 3. In detail, as shown in FIG. 1, one end portion of the third recovery pipe 24 is connected to the purge section 9, and the other end portion is connected to the recovery tank 25, and these purge section 9 and the recovery tank 25 are communicated. The third recovery pipe 24 recovers the third mixed discharge liquid 203 from the purge section 9, and causes the recovered third mixed discharge liquid 203 to flow into the inside of the recovery tank 25. The third mixed discharge liquid 203 is discharge liquid in which the purge gas and the ammonia fuel are mixed and discharged from the purge section 9. Figure 1 ​​As shown, one end of the third recovery pipe 24 is connected to the outlet pipe 9b of the purge section 9, and the other end is connected to the recovery tank 25, which communicates the outlet pipe 9b and the recovery tank 25. As described above, the outlet pipe 9b opens to the first inner side pipe 7a of the double pipe 7, which is a communication pipe that communicates the fuel injection valve 4 and the ammonia pump 5b. That is, the third recovery pipe 24 communicates the first inner side pipe 7a and the recovery tank 25 via the outlet pipe 9b. Such a third recovery pipe 24 recovers the third mixed discharge liquid 203 from the first inner side pipe 7a via the outlet pipe 9b, and causes the recovered third mixed discharge liquid 203 to flow into the inside of the recovery tank 25. The third mixed discharge liquid 203 is a discharge liquid in which the ammonia fuel discharged from the first inner side pipe 7a by the purge section 9 and the purge gas are mixed.

[0146] The recovery tank 25 recovers the mixed discharge liquid from the fuel injection system 3 through the above-described at least one recovery pipe, and stores the ammonia-containing discharge liquid containing at least one of the gas component and the oil component other than the ammonia component and the ammonia fuel. In detail, as shown in FIG. 1, the recovery tank 25 communicates with the first recovery pipe 22, the second recovery pipe 23, and the third recovery pipe 24, and recovers the first mixed discharge liquid 201, the second mixed discharge liquid 202, and the third mixed discharge liquid 203 from these recovery pipes, respectively. The recovery tank 25 stores the recovered first mixed discharge liquid 201, the second mixed discharge liquid 202, and the third mixed discharge liquid 203 as the ammonia-containing discharge liquid 200 from the fuel injection system 3. In the first embodiment, the ammonia-containing discharge liquid 200 contains the ammonia fuel, the fossil fuel, the lubricating oil, and the purge gas discharged from the fuel injection system 3. Figure 1

[0147] In addition, the recovery tank 25 has a function as a gas-liquid separator. That is, the recovery tank 25 gas-liquid separates the stored ammonia-containing discharge liquid 200 into an ammonia-containing liquid 204 and an ammonia-containing gas 205. The ammonia-containing liquid 204 is a liquid component containing at least one of the oil component, that is, the fossil fuel in the first mixed discharge liquid 201 and the lubricating oil in the second mixed discharge liquid 202, and the recovered ammonia fuel. The ammonia-containing gas 205 is a gas component containing the ammonia gas gasified from the recovered ammonia fuel and the purge gas in the third mixed discharge liquid 203.

[0148] The supply section 26 supplies the ammonia component contained in the ammonia-containing discharge liquid 200 recovered by the above-described recovery section 21 to one or more functional sections that function using the ammonia component. In the first embodiment, one of the one or more functional sections is the above-described exhaust gas treatment device 10. That is, the supply section 26 supplies the ammonia component contained in the above-described ammonia-containing discharge liquid 200 to the exhaust gas treatment device 10. As shown in FIG. 1, the supply section 26 is provided with a supply pipe 26a that communicates the recovery tank 25 and the exhaust gas treatment device 10. The supply pipe 26a is provided with a pump 26b that is provided in the supply pipe 26a and that is configured to supply the ammonia component contained in the ammonia-containing discharge liquid 200 to the exhaust gas treatment device 10. Figure 1 ​As shown, the supply unit 26 includes an oxidation reactor 27, a supply pipe 28, and a pump 29 for supplying ammonia components contained in the ammonia-containing liquid 204 separated from the ammonia-containing effluent 200 to the waste gas treatment device 10. Additionally, the supply unit 26 includes an ammonia water generation unit 30, an inlet pipe 31, a supply pipe 32, a pump 33, and a confluence valve 34 for supplying ammonia components contained in the ammonia-containing gas 205 separated from the ammonia-containing effluent 200 to the waste gas treatment device 10. The supply unit 26 also includes a quantitative feeding unit 35, a nitrogen oxide sensor 36, and a control unit 37.

[0149] Oxidation reactor 27 is an example of an extraction section that removes oil components and extracts ammonia components from ammonia-containing liquid 204. More specifically, as... Figure 1 As shown, the oxidation reactor 27, for example composed of a catalyst with oxidation function, is disposed in the middle section of the exhaust pipe 101, which connects the marine diesel engine 1 to the mixer 12 of the exhaust gas treatment device 10. More specifically, the exhaust pipe 101 is a pipe that branches into a first branch pipe 101a and a second branch pipe 101b in its middle section. One end of the first branch pipe 101a is connected to the marine diesel engine 1, and the other end is connected to the mixer 12, connecting the marine diesel engine 1 to the mixer 12. The second branch pipe 101b branches off from the first branch pipe 101a in the middle section of the exhaust pipe 101 and merges with the first branch pipe 101a downstream of the branch point of the exhaust pipe 101. The oxidation reactor 27 is disposed in the middle section of the second branch pipe 101b of such an exhaust pipe 101, and is configured such that a portion of the exhaust gas discharged from the marine diesel engine 1 to the exhaust pipe 101 can flow in and out through the second branch pipe 101b.

[0150] like Figure 1 As shown, one end of the supply pipe 28 is connected to the middle section of the upstream side of the oxidation reactor 27 in the second branch pipe 101b, and the other end is connected to the lower part of the liquid level of the ammonia-containing liquid 204 in the recovery tank 25, thus connecting the recovery tank 25 and the oxidation reactor 27 via the second branch pipe 101b. The pump 29 is located in the middle section of the supply pipe 28 (in...). Figure 1 (The middle is near the recovery tank 25). The supply pipe 28 delivers ammonia-containing liquid 204 from the recovery tank 25 to the oxidation reactor 27 via the action of the pump 29.

[0151] Here, the oxidation reactor 27 receives ammonia-containing liquid 204 supplied through the supply pipe 28 and receives exhaust gas from the marine diesel engine 1 through the second branch pipe 101b. The oxidation reactor 27 contacts the supplied ammonia-containing liquid 204 with an oxidation catalyst layer (not shown), using the exhaust gas as a heat source to burn the ammonia-containing liquid 204 through an oxidation reaction. Thus, in the oxidation reactor 27, the oil components in the ammonia-containing liquid 204 and the oil components in the ammonia fuel are transformed into high-temperature exhaust gas containing nitrogen oxides (NOx, etc.) due to combustion, and a portion of the ammonia fuel is oxidized to nitrogen oxides (N2O, etc.) from the ammonia fuel. These nitrogen oxides from the ammonia fuel, along with the aforementioned NOx, are contained in the high-temperature exhaust gas. The remaining ammonia fuel is extracted as unburned ammonia. Afterwards, the oxidation reactor 27 sends a mixed gas 206 containing these high-temperature exhaust gases (containing nitrogen oxides such as NOx and N2O) and unburned ammonia components to the second branch pipe 101b, where it merges with the exhaust gas in the first branch pipe 101a. The supply unit 26 supplies the unburned ammonia component extracted from the oxidation reactor 27, along with the mixed gas 206 and the high-temperature exhaust gas, to the mixer 12 through the first branch pipe 101a. The unburned ammonia component is utilized as part of the reducing agent mixed with the exhaust gas in the mixer 12, and the high-temperature exhaust gas is used to promote the gasification and hydrolysis of the reducing agent injected from the reducing agent injection unit 12a.

[0152] The ammonia water generation unit 30 generates ammonia water from ammonia-containing gas 205. More specifically, as... Figure 1 As shown, the ammonia water generating unit 30 is connected to an inlet pipe 31 for introducing ammonia-containing gas 205 from the recovery tank 25 into the ammonia water generating unit 30. One end of the inlet pipe 31 is connected to a position in the recovery tank 25 above the liquid level of the ammonia-containing liquid 204, and the other end is connected to the ammonia water generating unit 30, thus communicating between the recovery tank 25 and the ammonia water generating unit 30. For example, the ammonia water generating unit 30 has an immersion pipe 30a inside that leads to the inlet pipe 31. In addition, the ammonia water generating unit 30 pre-stores water supplied from the water injection unit (not shown). The ammonia water generating unit 30 sprays the ammonia-containing gas 205 introduced from the recovery tank 25 through the inlet pipe 31 into the water and adds water to the ammonia-containing gas 205. As a result, the ammonia water generating unit 30 separates the ammonia-containing gas 205 into purge gas and ammonia gas, and generates ammonia water 207 as an aqueous solution of the ammonia gas. The ammonia water 207 contains ammonia components from the aforementioned ammonia-containing discharge liquid 200. The ammonia water generation unit 30 discharges the purging gas separated from the ammonia-containing gas 205 to the outside and sends the generated ammonia water 207 to the supply pipe 32.

[0153] In addition, the ammonia generation section 30 is not limited to having Figure 1The impregnation tube 30a shown may, for example, be replaced by a water spraying section. In this case, the ammonia water generating section 30 sprays water from the water spraying section onto the ammonia-containing gas 205 introduced through the inlet pipe 31, thereby separating the purge gas from the ammonia-containing gas 205 and generating ammonia water 207 as described above.

[0154] like Figure 1 As shown, one end of the supply pipe 32 is connected to a position in the ammonia water generating section 30 that is lower than the liquid level of the ammonia water 207, and the other end is connected to the confluence valve 34, which connects the ammonia water generating section 30 to the reducing agent supply section 13 (e.g., supply pipe 17) of the waste gas treatment device 10. The pump 33 is located in the middle of the supply pipe 32 (in... Figure 1 (The middle part is near the ammonia water generation section 30). Through the action of pump 33, the supply pipe 32 delivers ammonia water 207 from the ammonia water generation section 30 to the reducing agent supply section 13.

[0155] The confluence valve 34 is used to combine the reducing agent from the reducing agent tank 14 with the ammonia water 207 from the ammonia water generation section 30. Specifically, the confluence valve 34 is composed of a solenoid valve, for example, such as... Figure 1 As shown, the supply pipes 16 and 17 on the side of the exhaust gas treatment device 10 and the supply pipe 32 on the side of the liquid treatment device 20 are connected. The merging valve 34 allows the reducing agent flowing from the reducing agent tank 14 through the supply pipe 16 to merge with the ammonia water 207 flowing from the ammonia water generation section 30 through the supply pipe 32 at a desired merging ratio, and sends this merging mixture of reducing agent and ammonia water 207 to the supply pipe 17.

[0156] Furthermore, the merging valve 34 can adjust the valve opening on the supply pipe 16 side and the valve opening on the supply pipe 32 side respectively. By adjusting these valve openings, the merging ratio of the reducing agent and ammonia 207 can be adjusted. For example, this merging ratio can be adjusted within the percentage range of reducing agent: ammonia 207 = 100:0 to 0:100. That is, the reducing agent supplied from the merging valve 34 to the mixer 12 through the supply pipes 17 and 18 is any one of the reducing agent from the reducing agent tank 14, the ammonia 207 from the ammonia generation section 30, and the mixture of these reducing agents and ammonia 207. Hereinafter, in order to distinguish between the reducing agent supplied to the mixer 12 (including the above-mentioned mixture) and the reducing agent from the reducing agent tank 14 (the reducing agent that does not merge with ammonia 207), the reducing agent from the reducing agent tank 14 is sometimes referred to as the main reducing agent.

[0157] The metering unit 35 adjusts the flow rate of the reducing agent supplied from the reducing agent supply section 13 to the mixer 12. Specifically, as... Figure 2As shown, the dosing unit 35 is provided between the supply pipes 17, 18 of the exhaust gas treatment device 10. The dosing unit 35 adjusts the flow rate of the reducing agent whose confluence ratio is adjusted by the confluence valve 34, and supplies the flow rate-adjusted reducing agent to the mixer 12 through the supply pipe 18.

[0158] The nitrogen oxide sensor detects the content (emission amount) of the nitrogen oxides contained in the exhaust gas treated by the exhaust gas treatment device 10. In detail, as shown, the nitrogen oxide sensor 36 is provided to the exhaust pipe 19 of the exhaust gas treatment device 10. The nitrogen oxide sensor 36 detects the content of the nitrogen oxides in the exhaust gas flowing inside the exhaust pipe 19, and sends a signal indicating the detected content of the nitrogen oxides to the control section 37. Figure 2

[0159] The control section 37 controls the confluence ratio of the main reducing agent to the aqueous ammonia 207 and the flow rate of the reducing agent in accordance with the content of the nitrogen oxides contained in the exhaust gas treated by the exhaust gas treatment device 10. In detail, as shown, the control section 37 is provided to the exhaust gas treatment device 10, and is connected to the confluence valve 34, the dosing unit 35, and the nitrogen oxide sensor 36 in a signal-receivable and -transmittable manner, respectively. The control section 37 receives the signal from the nitrogen oxide sensor 36, and acquires the content of the nitrogen oxides detected by the nitrogen oxide sensor 36 on the basis of the received signal. The control section 37 controls the valve opening degree of the confluence valve 34 and the operation of the dosing unit 35 in accordance with the acquired content of the nitrogen oxides. Thereby, the control section 37 controls the confluence ratio and the flow rate of the reducing agent supplied to the mixer 12. For example, the control section 37 increases at least one of the confluence ratio of the main reducing agent to the aqueous ammonia 207 and the flow rate of the reducing agent in correspondence with an increase in the content of the nitrogen oxides. In addition, the control section 37 decreases at least one of the confluence ratio of the main reducing agent to the aqueous ammonia 207 and the flow rate of the reducing agent in correspondence with a decrease in the content of the nitrogen oxides. Figure 2

[0160] Here, the supply section 26 supplies the aqueous ammonia 207 to the reducing agent supply section 13 via the above-described supply pipe 32 and the confluence valve 34, whereby the aqueous ammonia 207 is added to the reducing agent supplied from the reducing agent supply section 13 to the mixer 12. At this time, the aqueous ammonia 207 is injected as at least a part of the reducing agent from the reducing agent injection section 12a to the exhaust gas inside the mixer 12, and is mixed with the exhaust gas together with the above-described unburnt ammonia component from the oxidation reactor 27. Thereafter, the nitrogen oxides in the exhaust gas transported from the mixer 12 to the reactor 11 are denitrified by the reactor 11 as described above. In the present first embodiment, by so doing, the ammonia component in the aqueous ammonia 207 is used as the reducing agent for reducing the emission amount of the nitrogen oxides in the exhaust gas.

[0161] ​​As described above, in the liquid discharge treatment device 20 of the first embodiment of the present application, the ammonia-containing liquid discharge 200 discharged from the fuel injection system 3 of the marine diesel engine 1 is recovered by the recovery section 21, and the ammonia component contained in the recovered ammonia-containing liquid discharge 200 is supplied to one or more functional sections that function using the ammonia component by the supply section 26. In detail, the ammonia-containing liquid discharge 200 in which the ammonia fuel, the fossil fuel, the lubricating oil, and the purge gas discharged from the fuel injection system 3 are mixed is recovered and stored in the recovery tank 25, the stored ammonia-containing liquid discharge 200 is separated into the ammonia-containing liquid 204 and the ammonia-containing gas 205 by the recovery tank 25, and the ammonia component extracted from the ammonia-containing liquid 204 by the oxidation reactor 27 and the ammonia water 207 generated by adding water to the ammonia-containing gas 205 are supplied to the exhaust gas treatment device 10 as one of the one or more functional sections.

[0162] Therefore, the purge gas (harmless gas such as nitrogen gas) separated from the ammonia-containing gas 205 can be simply discharged, and the ammonia component in the ammonia-containing liquid 204 and the ammonia component in the ammonia-containing gas 205 can be effectively used as a reducing agent for denitration of the nitrogen oxide in the exhaust gas in the exhaust gas treatment device 10 without increasing the discharge amount of the nitrogen oxide from the ship by incineration treatment. In addition, it is not necessary to store the ammonia-containing liquid discharge 200 in the ship until unloading, and further, the oil component contained in the ammonia-containing liquid 204 can be changed to the nitrogen oxide by the oxidation reactor 27, and can be efficiently treated by the exhaust gas treatment device 10 in which the ammonia component is effectively used as a reducing agent. Therefore, the cost required for treatment of the ammonia-containing liquid discharge 200 can be reduced.

[0163] In addition, in the liquid discharge treatment device 20 of the first embodiment of the present application, the ammonia water 207 generated based on the gas component (ammonia-containing gas 205) of the ammonia-containing liquid discharge 200 is additionally supplied to the exhaust gas treatment device 10 as a reducing agent mixed with the exhaust gas in the mixer 12. Therefore, the consumption amount of the main reducing agent from the reducing agent tank 14 originally used in the exhaust gas treatment device 10 can be reduced by the additional supply amount of the ammonia water 207, and thus, the main reducing agent can be saved.

[0164] In addition, in the liquid discharge treatment device 20 of the first embodiment of the present application, the ammonia component extracted from the liquid component (ammonia-containing liquid 204) of the ammonia-containing liquid discharge 200 is supplied to the mixer 12 of the exhaust gas treatment device 10 together with the exhaust gas. Therefore, the ammonia concentration in the reducing agent mixed with the exhaust gas in the mixer 12 can be increased, and thus, the denitration effect of the reactor 11 of the exhaust gas treatment device 10 on the nitrogen oxide in the exhaust gas can be improved.

[0165] (Second Embodiment)

[0166] Next, the liquid discharge treatment device of the second embodiment of the present application will be described.Figure 2 is a view showing one configuration example of the liquid discharge treatment device of the second embodiment of the present application. In Figure 2 , in addition to the liquid discharge treatment device 20A of the second embodiment, a marine diesel engine 1 to which the liquid discharge treatment device 20A is applied and an exhaust gas recirculation (EGR: Exhaust Gas Recirculation) device, i.e., an EGR device 40, applied to the marine diesel engine 1 are illustrated.

[0167] As shown in Figure 2 , the liquid discharge treatment device 20A is provided with a recovery section 21A instead of the recovery section 21 of the liquid discharge treatment device 20 of the first embodiment described above, and is provided with a supply section 26A instead of the supply section 26. In addition, in the second embodiment, as a device for reducing nitrogen oxides in exhaust gas of the marine diesel engine 1, the EGR device 40 is provided instead of the exhaust gas treatment device 10 in the first embodiment. The other structures are the same as those of the first embodiment, and the same reference numerals are assigned to the same structural parts. In addition, in the marine diesel engine 1 shown in Figure 2 , for convenience of explanation, a ventilation system 60 for ventilating the internal space of the double pipe 7 is illustrated, and the illustration of the purge section 9 described above is omitted. Hereinafter, the ventilation system 60 and the EGR device 40 of the marine diesel engine 1 are described in order, and then the liquid discharge treatment device 20A is described.

[0168] (Ventilation system of marine diesel engine)

[0169] As shown in Figure 2 , the ventilation system 60 of the marine diesel engine 1 is provided with a ventilation fan 61, a ventilation pipe 62, an ammonia sensor 63, a water injection section 64, and a control section 65.

[0170] The ventilation fan 61 draws gas of the internal space of the double pipe 7 for ventilation of the internal space. As shown in Figure 2 , the ventilation fan 61 is provided at a middle portion of the ventilation pipe 62. As shown in Figure 2 , the ventilation pipe 62 is disposed at a middle portion of the second outer pipe 7d in the double pipe 7, for example, a vicinity of the ammonia fuel tank 8. The ventilation pipe 62 communicates with the internal space of the double pipe 7, and discharges gas (air) drawn by the ventilation fan 61 to the outside. In addition, the internal space of the double pipe 7 refers to a space between an outer peripheral surface of the first inner pipe 7a and an inner peripheral surface of the first outer pipe 7b, and a space between an outer peripheral surface of the second inner pipe 7c and an inner peripheral surface of the second outer pipe 7d. In addition, although not particularly illustrated, the ventilation pipe 62 is provided with a ventilation port that supplies outside air to the internal space of the double pipe 7 as the ventilation fan 61 draws gas. The ventilation port has, for example, a check valve structure, and can supply outside air to the internal space, and prohibit gas from flowing from the internal space to the outside.

[0171] As Figure 2 shown, the ammonia sensor 63 is provided at a middle portion of the second outer side pipe 7d of the double pipe 7, and detects ammonia gas present in the inside space of the double pipe 7. In detail, in a case where the internal gas 210 drawn by the ventilation fan 61 contains an ammonia component, the ammonia sensor 63 detects the ammonia component. In addition, the internal gas 210 is a gas present in the inside space of the double pipe 7. The ammonia sensor 63 transmits a signal indicating the detection result of the above-described ammonia component (presence or absence of the ammonia component) to the control section 65.

[0172] As Figure 2 shown, the water spraying section 64 has a water spraying nozzle 64a, and is provided between the ventilation pipe 62 and the ammonia sensor 63 (i.e., at a portion on the ammonia fuel tank 8 side than the ammonia sensor 63) in a manner that the spray port of the water spraying nozzle 64a faces the inside space of the double pipe 7. The water spraying section 64 sprays water from the water spraying nozzle 64a to the internal gas 210 drawn by the ventilation fan 61. Thereby, the water spraying section 64 removes the ammonia component from the internal gas 210, and generates ammonia water by mixing the removed ammonia component with water. The internal gas 210 after the removal of the ammonia component is, for example, air, and is discharged to the outside from the inside space of the double pipe 7 through the ventilation pipe 62 by the action of the ventilation fan 61.

[0173] As Figure 2 shown, the control section 65 is connected to the ammonia sensor 63 and the water spraying section 64 in a signal transmittable and receivable manner, respectively. The control section 65 receives a signal from the ammonia sensor 63, and judges whether or not the internal gas 210 contains an ammonia component based on the received signal. In a case where the internal gas 210 contains an ammonia component, the control section 65 controls the water spraying section 64 to spray water toward the internal gas 210. In a case where the internal gas 210 does not contain an ammonia component, the control section 65 controls the water spraying section 64 to stop spraying water to the internal gas 210.

[0174] (EGR device)

[0175] The EGR device 40 is a device that washes a recirculation gas, which is a part of exhaust gas discharged from the marine diesel engine 1, with scrubbing water and returns it to the marine diesel engine 1, thereby reducing nitrogen oxides in the exhaust gas. For example, as Figure 2 shown, the EGR device 40 is provided with a scrubber 41, a demister 42, and an EGR blower 43. The EGR device 40 is further provided with a collection tank 44, an alkali solution supply section 45a, a clean water supply section 45b, a pH meter 46, a control section 47, a water supply pipe 48, and a pump 49.

[0176] The scrubber 41 washes a part of the exhaust gas discharged from the marine diesel engine 1 in order to use (reuse) it as a recirculation gas. As Figure 2As shown, the inlet of the scrubber 41 is connected to the inlet recirculation pipe 103. The inlet recirculation pipe 103 is connected to the middle section of the exhaust pipe 102 leading to the marine diesel engine 1. A portion of the exhaust gas from the marine diesel engine 1 is supplied to the scrubber 41 through the exhaust pipe 102 and the inlet recirculation pipe 103. The remaining exhaust gas is discharged to the outside through the exhaust pipe 102 from the ship's funnel. The scrubber 41 includes a scrubbing water spray section 41a that sprays scrubbing water onto the exhaust gas to be cleaned. The scrubbing water spray section 41a has spray nozzles facing the interior of the scrubber 41 and is configured to supply scrubbing water through piping. The scrubber 41 sprays scrubbing water from the scrubbing water spray section 41a onto the exhaust gas (recirculated gas) supplied through the inlet recirculation pipe 103, thereby cleaning the recirculated gas.

[0177] like Figure 2 As shown, the demister 42 has a hollow rectangular housing and is connected to the outlet of the scrubber 41. Furthermore, the lower part (bottom) of the demister 42 is connected to an outlet pipe 42a leading to the collection tank 44. The recirculated gas, cleaned by the scrubber 41 using a jet of washing water, and the washing water used to clean the recirculated gas flow into the demister 42. The demister 42 separates the cleaned recirculated gas from the used washing water. The recirculated gas and the recirculated gas in the washing water are discharged from the gas outlet of the demister 42 to the EGR blower 43, while the washing water is recovered from the lower part of the demister 42 through the outlet pipe 42a to the collection tank 44.

[0178] like Figure 2 As shown, the EGR blower 43 is located above the demister 42. Furthermore, the outlet of the EGR blower 43 is connected to the outlet recirculation pipe 104 leading to the marine diesel engine 1. The EGR blower 43 supplies recirculated gas from the demister 42 to the marine diesel engine 1 through the outlet recirculation pipe 104.

[0179] For example, such as Figure 2 As shown, the collection box 44 is positioned below the demister 42 and is connected to the demister 42 via the outlet pipe 42a. The collection box 44 recovers the washing water 208 used for cleaning the exhaust gas as described above from the demister 42 through the outlet pipe 42a, and stores the recovered washing water 208. Furthermore, the recovered washing water 208 is acidic because it contains sulfur oxides (SOx) and the like removed from the exhaust gas during cleaning.

[0180] like Figure 2 As shown, the alkali supply unit 45a is connected to the collection tank 44 via piping, and an alkali solution for neutralizing the wash water 208 is supplied to the collection tank 44 by the action of a pump or the like (not shown). Examples of such alkali solutions include sodium hydroxide. The collection tank 44 accumulates the acidic wash water 208 as described above, and neutralizes the wash water 208 using the alkali solution supplied from the alkali supply unit 45a, etc.

[0181] As shown in Figure 3 Fig. 6, the fresh water supply part 45b is communicated with the collection tank 44 through a pipe, and supplies fresh water for diluting or replenishing the scrubbing water 208 to the collection tank 44 by the action of a pump or the like (not shown). As the fresh water, for example, fresh water loaded from outside the ship, fresh water produced in the ship, blowdown from the marine diesel engine 1, and the like can be cited.

[0182] As shown in Figure 3 Fig. 7, the pH meter 46 is provided to the collection tank 44, and measures the pH of the scrubbing water 208. The pH meter 46 sends a signal indicating the measured pH (measured value) of the scrubbing water 208 to the control part 47.

[0183] The control part 47 acquires the pH of the scrubbing water 208 based on the signal received from the pH meter 46, and controls the supply amount of the alkali solution from the alkali solution supply part 45a to the collection tank 44 based on the acquired pH. In addition, the control part 47 controls the supply amount of the fresh water from the fresh water supply part 45b to the collection tank 44 based on the liquid level of the scrubbing water 208 in the collection tank 44.

[0184] The water supply pipe 48 and the pump 49 are used to supply the neutralized scrubbing water 208 to the scrubber 41. As shown in Figure 3 Fig. 8, the water supply pipe 48 is configured to communicate the scrubbing water injection part 41a of the scrubber 41 with the collection tank 44. The pump 49 is provided to the middle portion of the water supply pipe 48. The water supply pipe 48 supplies the neutralized scrubbing water 208 to the scrubbing water injection part 41a by the action of the pump 49. This scrubbing water 208 is reused for the cleaning of the exhaust gas by the scrubber 41.

[0185] As shown in Figure 3 Fig. 9, the water treatment device 50 is provided to the middle portion of the water supply pipe 48, and removes foreign matter (for example, coal dust from the exhaust gas) from the scrubbing water 208 supplied to the scrubber 41 through the water supply pipe 48. The water treatment device 50 returns the scrubbing water 208 after the removal of the foreign matter to the water supply pipe 48.

[0186] (Blowdown treatment device)

[0187] As shown in Figure 3 Fig. 10, the blowdown treatment device 20A is provided with a recovery part 21A that recovers the ammonia-containing blowdown 200A, and a supply part 26A that supplies the ammonia component of the recovered ammonia-containing blowdown to one or more functional parts.

[0188] The recovery part 21A is communicated with the fuel injection system 3 of the marine diesel engine 1 described above, and recovers the ammonia-containing blowdown 200A discharged from the fuel injection system 3. In detail, as shown in Figure 3As shown, the recovery section 21A is a hollow structure configured to airtightly cover the ammonia pump 5b and communicate with the double-layer pipe 7. That is, the recovery section 21A is airtightly connected to the first outer pipe 7b and the second outer pipe 7d of the double-layer pipe 7, and has a bottom space. This bottom space communicates the internal space between the outer peripheral surface of the first inner pipe 7a and the inner peripheral surface of the first outer pipe 7b, and the internal space between the outer peripheral surface of the second inner pipe 7c and the inner peripheral surface of the second outer pipe 7d. The ammonia pump 5b is airtightly covered inside this bottom space.

[0189] like Figure 3 As shown, here, the second outer pipe 7d and the second inner pipe 7c of the double-walled pipe 7 slope downwards from the ammonia fuel tank 8 toward the ammonia pump 5b. Furthermore, the ammonia component separated from the internal gas 210 of the double-walled pipe 7 by the water spray section 64 of the aforementioned ventilation system 60 dissolves in the water sprayed from the water spray section 64 to form ammonia water. This ammonia water flows down the inner circumferential surface of the second outer pipe 7d and is injected into the bottomed space of the recovery section 21A. The recovery section 21A recovers this ammonia water as ammonia-containing discharge liquid 200A from the double-walled pipe 7. The recovery section 21A accumulates the recovered ammonia-containing discharge liquid 200A at the bottom of its bottomed space.

[0190] Supply unit 26A supplies the ammonia component contained in the ammonia-containing wastewater 200A recovered by recovery unit 21A to one or more functional units that utilize this ammonia component. In this second embodiment, one of these functional units is the collection tank 44 of the EGR device 40. Figure 3 As shown, the supply unit 26A is composed of a pipe that slopes downward from the recovery unit 21A toward the collection tank 44, and connects the recovery unit 21A and the collection tank 44. The supply unit 26A supplies ammonia-containing wastewater 200A from the recovery unit 21A to the collection tank 44 by gravity.

[0191] Here, the ammonia-containing wastewater 200A is ammonia water containing ammonia components from ammonia fuel, and therefore functions as an alkaline solution to neutralize the acidic wash water 208. The supply unit 26A separately supplies this ammonia-containing wastewater 200A to the collection tank 44 from the alkaline solution supply unit 45a. The collection tank 44 mixes the alkaline solution from the alkaline solution supply unit 45a with the ammonia-containing wastewater 200A from the supply unit 26A and the acidic wash water 208, thereby neutralizing the wash water 208. Thus, in this second embodiment, the ammonia component of the ammonia-containing wastewater 200A is utilized as an alkaline component for neutralizing the acidic wash water 208.

[0192] As described above, in the drain treatment device 20A of the second embodiment of the present application, the ammonia-containing drain 200A discharged from the fuel injection system 3 of the marine diesel engine 1 is recovered by the recovery section 21A, and the ammonia component contained in the recovered ammonia-containing drain 200A is supplied to one or more functional sections that function using the ammonia component by the supply section 26A. In detail, the ammonia-containing drain 200A as ammonia water is recovered from the inner space of the double pipe 7 of the fuel injection system 3 and stored in the bottomed space of the recovery section 21A, and the stored ammonia-containing drain 200A is supplied to the collection tank 44 of the EGR device 40 as one of the one or more functional sections by the supply section 26A.

[0193] Therefore, the ammonia component of the ammonia-containing drain 200A can be effectively utilized as an alkaline component (alkali) for neutralizing the acidic scrubbing water 208 in the collection tank 44 without increasing the discharge amount of nitrogen oxides from the ship by incineration treatment. In addition, it is not necessary to store the ammonia-containing drain 200A in the ship until unloading, and thus it is possible to reduce the cost required for the treatment of the ammonia-containing drain 200A.

[0194] In addition, in the drain treatment device 20A of the second embodiment of the present application, the ammonia-containing drain 200A (ammonia water) is additionally supplied from the supply section 26A in addition to the alkali supply section 45a that originally supplies the alkali to the collection tank 44. Therefore, it is possible to support the neutralization treatment of the scrubbing water 208 in the collection tank 44 using the supply of the ammonia-containing drain 200A, and it is possible to reduce the consumption amount of the alkali from the alkali supply section 45a by the amount of the additional supply of the ammonia-containing drain 200A, and thus it is possible to save the alkali.

[0195] (Third Embodiment)

[0196] Next, the drain treatment device of the third embodiment of the present application will be described. Figure 3 is a view showing one configuration example of the drain treatment device of the third embodiment of the present application. In Figure 4 , in addition to the drain treatment device 20B of the present third embodiment, a marine diesel engine 1 to which the drain treatment device 20B is applied and an exhaust treatment device 10 applied to the marine diesel engine 1 are illustrated. As Figure 4 shown, the drain treatment device 20B is provided with a supply section 26B instead of the supply section 26 of the above-described first embodiment of the drain treatment device 20. In addition, in the present third embodiment, the exhaust treatment device 10 is provided with a supply pipe 16A instead of the supply pipes 16, 17 of the above-described first embodiment, a dosing unit 35A instead of the dosing unit 35, and a control section 37A instead of the control section 37. The other structures are the same as those of the first embodiment, and the same reference numerals are assigned to the same structure parts.

[0197] (Drainage treatment device)

[0198] The wastewater treatment device 20B, similar to the first embodiment described above, supplies the ammonia component contained in the liquid component (ammonia-containing liquid 204) of the ammonia-containing wastewater 200 to the exhaust gas treatment device 10, and supplies the ammonia component contained in the gaseous component (ammonia-containing gas 205) of the ammonia-containing wastewater 200 to the combustion chamber 2c of the marine diesel engine 1. That is, in this third embodiment, the drive system 2 of the marine diesel engine 1 and the exhaust gas treatment device 10 are two or more functional units that utilize the ammonia component.

[0199] like Figure 4 As shown, the supply section 26B of this liquid treatment device 20B includes an oxidation reactor 27, a supply pipe 28, and a pump 29 for supplying ammonia components contained in the ammonia-containing liquid 204 to the waste gas treatment device 10. These oxidation reactors 27, supply pipes 28, and pumps 29 are the same as those in the first embodiment described above. Furthermore, as... Figure 4 As shown, the supply unit 26B includes an ammonia water generating unit 30, an inlet pipe 31, supply pipes 32A-1 and 32A-2, a pump 33, an ammonia pump 33A, and an ammonia injection valve 70 for supplying ammonia components contained in ammonia-containing gas 205 to the drive system 2 of the marine diesel engine 1. The ammonia water generating unit 30, the inlet pipe 31, and the pump 33 are the same as those in the first embodiment described above.

[0200] like Figure 4 As shown, the supply pipe 32A-1 is a pipe with one end connected to a position in the ammonia water generation section 30 below the liquid level of the ammonia water 207, and the other end connected to the ammonia injection valve 70. Figure 4 As shown, an ammonia pump 33A is installed in the middle of the supply pipe 32A-1. The ammonia pump 33A, like the ammonia pump 5b of the fuel injection system 3 of the marine diesel engine 1, has a fluid pressure delivery function. The supply pipe 32A-1 connects the ammonia water generation unit 30 and the ammonia injection valve 70 via the ammonia pump 33A. Furthermore, a pump 33 is installed in the middle of the supply pipe 32A-1, closer to the ammonia water generation unit 30 than the ammonia pump 33A, similar to the first embodiment. Through the action of the pump 33, the supply pipe 32A-1 supplies ammonia water 207 from the ammonia water generation unit 30 to the ammonia pump 33A. The ammonia pump 33A increases the pressure of the supplied ammonia water 207 and delivers it to the outlet side of the supply pipe 32A-1 (the ammonia injection valve 70 side). Through the action of the ammonia pump 33A, the supply pipe 32A-1 pressurizes ammonia water 207 into the ammonia injection valve 70.

[0201] like Figure 4As shown, the ammonia injection valve 70 is provided to the cylinder block 2a of the drive system 2 in a manner that the injection port faces the combustion chamber 2c of the marine diesel engine 1. Although not particularly shown, the ammonia injection valve 70 has an internal path to the injection port. The supply section 26B injects the aqueous ammonia 207, which is pressurized to the ammonia injection valve 70 from the aqueous ammonia generation section 30 through the supply pipe 32A-1 and the like, from the ammonia injection valve 70 to the combustion chamber 2c.

[0202] Further, the supply pipe 32A-1 described above is provided with a supply pipe 32A-2 for supplying the aqueous ammonia 207 to the combustion chamber 2c via the fuel injection system 3 of the marine diesel engine 1. As shown, Figure 4 The supply pipe 32A-2 is a pipe that one end portion is connected to a middle portion of the supply pipe 32A-1 (for example, a portion between the pump 33 and the ammonia pump 33A) and the other end portion is connected to the ammonia pump 5b of the fuel injection system 3. Further, it can also be that the supply pipe 32A-2 is connected to the second inner side pipe 7c of the double pipe 7 that leads to the ammonia pump 5b and communicates with the ammonia pump 5b via the second inner side pipe 7c. The supply pipe 32A-2 supplies the aqueous ammonia 207 from the aqueous ammonia generation section 30 to the ammonia pump 5b by the action of the pump 33 and pressurizes the aqueous ammonia 207 to the fuel injection valve 4 by the action of the ammonia pump 5b. That is, the supply section 26B injects the aqueous ammonia 207, which is supplied to the ammonia pump 5b from the aqueous ammonia generation section 30 through the supply pipe 32A-2 and the like, from the fuel injection valve 4 to the combustion chamber 2c using the pressurizing function of the ammonia pump 5b.

[0203] Here, the aqueous ammonia 207 injected from the ammonia injection valve 70 to the combustion chamber 2c as described above is combusted (co-combusted) together with the aqueous ammonia 207, the ammonia fuel, and the fossil fuel injected from the fuel injection valve 4 to the combustion chamber 2c in the combustion chamber 2c. The drive system 2 generates a driving force using the combustion energy thus generated. In this way, in the present third embodiment, the ammonia component in the aqueous ammonia 207 is utilized as a part of the ammonia fuel for driving the drive system 2.

[0204] Further, in the reducing agent supply section 13 of the exhaust gas treatment device 10 of the present third embodiment, as shown, ​ The supply pipe 16A is configured to communicate the reducing agent tank 14 with the dosing unit 35A. The dosing unit 35A adjusts the flow rate of the reducing agent supplied from the reducing agent tank 14 to the mixer 12. The control section 37A controls the dosing unit 35A. The control of the dosing unit 35A by the control section 37A is the same as that of the first embodiment described above.

[0205] As described above, in the liquid discharge treatment device 20B of the third embodiment of the present application, the ammonia water 207 generated based on the gas component (ammonia-containing gas 205) of the recovered ammonia-containing liquid discharge 200 is injected into the combustion chamber 2c of the drive system 2 of the marine diesel engine 1 which is one of the one or more functional units that functions using the ammonia component, and the other is the same as the first embodiment. Therefore, the same effects as the first embodiment described above can be obtained, and the amount of the ammonia fuel injected from the fuel injection valve 4 into the combustion chamber 2c is reduced by the amount of the injection amount of the ammonia water 207 injected into the combustion chamber 2c, whereby the consumption amount of the ammonia fuel can be reduced.

[0206] (Fourth Embodiment)

[0207] Next, the liquid discharge treatment device of the fourth embodiment of the present application will be described. ​ is a view showing one configuration example of the liquid discharge treatment device of the fourth embodiment of the present application. In ​ , in addition to the liquid discharge treatment device 20C of the present fourth embodiment, a marine diesel engine 1 to which the liquid discharge treatment device 20C is applied and an EGR device 40 applied to the marine diesel engine 1 are illustrated. As ​ indicated, the liquid discharge treatment device 20C is provided with a supply portion 26C instead of the supply portion 26A of the liquid discharge treatment device 20A of the second embodiment described above. The other structures are the same as the second embodiment, and the same structure portions are denoted by the same symbols.

[0208] (Liquid Discharge Treatment Device)

[0209] Instead of supplying the ammonia-containing liquid discharge 200A (ammonia water) recovered by the recovery portion 21A from the double-layer pipe 7 of the fuel injection system 3 to the collection tank 44 of the EGR device 40, the liquid discharge treatment device 20C supplies (injects) the ammonia-containing liquid discharge 200A (ammonia water) recovered by the recovery portion 21A from the double-layer pipe 7 of the fuel injection system 3 to the combustion chamber 2c of the marine diesel engine 1 as in the third embodiment described above. That is, in the present fourth embodiment, one of the one or more functional units that functions using the ammonia component is the drive system 2 of the marine diesel engine 1.

[0210] As ​ indicated, the supply portion 26C of such a liquid discharge treatment device 20C is provided with a supply pipe 32B-1, 32B-2, a pump 33, an ammonia pump 33A, and an ammonia injection valve 70. The pump 33, the ammonia pump 33A, and the ammonia injection valve 70 among them are the same as the third embodiment described above.

[0211] As ​ indicated, the supply pipe 32B-1 is a pipe having one end portion connected to the bottom portion of the recovery portion 21A and the other end portion connected to the ammonia injection valve 70. As ​As shown, an ammonia pump 33A is provided at a middle portion of the supply pipe 32B-1, and the recovery portion 21A is communicated with the ammonia injection valve 70 via the ammonia pump 33A. In addition, as shown in FIG. 6, a pump 33 is provided at a side of the middle portion of the supply pipe 32B-1, which is closer to the recovery portion 21A than the ammonia pump 33A. The supply pipe 32B-1 supplies the ammonia-containing exhaust liquid 200A (i.e., ammonia water) from the recovery portion 21A to the ammonia pump 33A by the action of the pump 33, and pressurizes the ammonia-containing exhaust liquid 200A by the ammonia pump 33A to supply the ammonia-containing exhaust liquid 200A to the ammonia injection valve 70. The supply portion 26C injects the ammonia-containing exhaust liquid 200A, which is pressurized by the ammonia pump 33A and supplied to the ammonia injection valve 70 from the recovery portion 21A through the supply pipe 32B-1 and the like, from the ammonia injection valve 70 to the combustion chamber 2c. ​ As shown, a pump 33 is provided at a side of the middle portion of the supply pipe 32B-1, which is closer to the recovery portion 21A than the ammonia pump 33A. The supply pipe 32B-1 supplies the ammonia-containing exhaust liquid 200A (i.e., ammonia water) from the recovery portion 21A to the ammonia pump 33A by the action of the pump 33, and pressurizes the ammonia-containing exhaust liquid 200A by the ammonia pump 33A to supply the ammonia-containing exhaust liquid 200A to the ammonia injection valve 70. The supply portion 26C injects the ammonia-containing exhaust liquid 200A, which is pressurized by the ammonia pump 33A and supplied to the ammonia injection valve 70 from the recovery portion 21A through the supply pipe 32B-1 and the like, from the ammonia injection valve 70 to the combustion chamber 2c.

[0212] In addition, the supply pipe 32B-1 is provided with a supply pipe 32B-2 for supplying the ammonia-containing exhaust liquid 200A to the combustion chamber 2c via the fuel injection system 3 of the marine diesel engine 1. As shown in FIG. 6, the supply pipe 32B-2 is a pipe that is connected at one end portion to a middle portion of the supply pipe 32B-1 (e.g., a portion between the pump 33 and the ammonia pump 33A) and is connected at the other end portion to the ammonia pump 5b of the fuel injection system 3. In addition, the supply pipe 32B-2 can be connected to the second inner side pipe 7c of the double pipe 7 that leads to the ammonia pump 5b, and can be communicated with the ammonia pump 5b via the second inner side pipe 7c. The supply pipe 32B-2 supplies the ammonia-containing exhaust liquid 200A from the recovery portion 21A to the ammonia pump 5b by the action of the pump 33, and pressurizes the ammonia-containing exhaust liquid 200A by the ammonia pump 5b to supply the ammonia-containing exhaust liquid 200A to the fuel injection valve 4. That is, the supply portion 26C injects the ammonia-containing exhaust liquid 200A, which is supplied to the ammonia pump 5b from the recovery portion 21A through the supply pipe 32B-2 and the like, from the fuel injection valve 4 to the combustion chamber 2c by the pressurizing function of the ammonia pump 5b. ​ As described above, the ammonia-containing exhaust liquid 200A injected into the combustion chamber 2c is used as a part of the ammonia fuel for driving the drive system 2, like the ammonia water 207 in the third embodiment.

[0213] As described above, in the exhaust liquid treatment device 20C of the fourth embodiment of the present application, like the third embodiment, the recovered ammonia-containing exhaust liquid 200A (ammonia water) is injected into the combustion chamber 2c of the drive system 2 of the marine diesel engine 1, which functions as one or more functional portions that utilize the ammonia component. Therefore, in the marine diesel engine 1 to which the EGR device 40 is applied, it is possible to inject the fossil fuel, the ammonia fuel, and the ammonia-containing exhaust liquid 200A into the combustion chamber 2c, and thus it is possible to reduce the injection amount of the ammonia fuel injected from the fuel injection valve 4 into the combustion chamber 2c by the injection amount of the ammonia-containing exhaust liquid 200A injected into the combustion chamber 2c. As a result, it is possible to reduce the consumption amount of the ammonia fuel.

[0214]

[0215] ​Further, in the first and third embodiments described above, the ammonia water generating section 30 in which the separation section that separates the purge gas and the ammonia water 207 by adding water to the ammonia-containing gas 205 is integrated with the storage section that stores the ammonia water 207 is exemplified, but the present application is not limited thereto. For example, the ammonia water generating section 30 can be configured separately from the separation section and the storage section.

[0216] Further, in the first and third embodiments described above, the oxidation reactor 27 is exemplified as an example of the extraction section that extracts the ammonia component from the ammonia-containing liquid 204, but the present application is not limited thereto. For example, the extraction section can be a member that extracts the ammonia component of the ammonia-containing liquid 204 by removing the oil component from the ammonia-containing liquid 204 with a filter or the like.

[0217] Further, in the first and third embodiments described above, the first recovery pipe 22, the second recovery pipe 23, and the third recovery pipe 24 are exemplified as the at least one recovery pipe through which the mixed drain liquid flows from the fuel injection system 3 to the recovery tank 25, but the present application is not limited thereto. For example, the at least one recovery pipe can be any one of the first recovery pipe 22, the second recovery pipe 23, or the third recovery pipe 24, and two or more of the first recovery pipe 22, the second recovery pipe 23, and the third recovery pipe 24 can be selected.

[0218] Further, in the first and third embodiments described above, the exhaust gas treatment device 10 that performs denitration of the nitrogen oxides in the exhaust gas discharged from the marine diesel engine 1 as a main engine of a ship is exemplified, but the present application is not limited thereto. For example, the exhaust gas treatment device 10 can perform denitration of the nitrogen oxides in the exhaust gas discharged from an auxiliary machine such as an electric generator of the ship. In this case, the drain liquid treatment device 20, 20B can recover the ammonia-containing drain liquid from the fuel injection system 3 of the marine diesel engine 1 to which the EGR device 40 exemplified in the second and fourth embodiments is applied, and supply the ammonia component of the recovered ammonia-containing drain liquid to two or more selected from the exhaust gas treatment device 10, the EGR device 40, and the drive system 2 of the marine diesel engine 1.

[0219] Further, in the second embodiment described above, the supply section 26A that supplies the ammonia-containing drain liquid 200A from the recovery section 21A to the collection tank 44 by gravity is exemplified, but the present application is not limited thereto. For example, the supply section 26A can include a supply pipe that communicates the recovery section 21A with the collection tank 44 and a pump that pressurizes and feeds the ammonia-containing drain liquid 200A from the recovery section 21A to the collection tank 44 through the supply pipe.

[0220] Further, in the second and fourth embodiments described above, the ammonia-containing drain 200A recovered from the double pipe 7 of the fuel injection system 3 of the marine diesel engine 1 is supplied to either one of the collection tank 44 of the EGR device 40 or the combustion chamber 2c of the marine diesel engine 1, but the present application is not limited thereto. For example, the drain treatment device 20A, 20C can supply the ammonia-containing drain 200A to both of the collection tank 44 of the EGR device 40 and the combustion chamber 2c of the marine diesel engine 1.

[0221] In the first to fourth embodiments described above, as the one or more functional units that function using the ammonia component, the exhaust treatment device 10, the collection tank 44 of the EGR device 40, and the drive system 2 of the marine diesel engine 1 are exemplified, but the present application is not limited thereto. For example, the one or more functional units can be the exhaust treatment device 10, can be the collection tank 44 of the EGR device 40, can be the drive system 2 of the marine diesel engine 1, can be an inboard device (auxiliary machinery such as a generator) other than these, or can be two or more selected from among these.

[0222] Further, the present application is not limited to the first to fourth embodiments described above, and a technical solution configured by appropriately combining the structural elements described above is also included in the present application. Other embodiments, examples, and application techniques made by those skilled in the art based on the first to fourth embodiments described above are all included in the scope of the present application.

Claims

1. A drainage treatment device, characterized by, Possessing: a recovery section that communicates with a fuel injection system for injecting ammonia fuel and fossil fuel into a combustion chamber of a marine diesel engine, and that recovers ammonia-containing drain liquid discharged from the fuel injection system; and a supply section that supplies an ammonia component contained in the recovered ammonia-containing drain liquid to one or more functional sections that function using the ammonia component, the recovery section possesses at least one recovery pipe through which a mixed drain liquid mixed with a gas component or an oil component other than the ammonia component and the ammonia fuel flows, the at least one recovery pipe includes a second recovery pipe that recovers a second mixed drain liquid mixed with lubricating oil of an ammonia pump and the ammonia fuel from the ammonia pump that pressurizes the ammonia fuel to a fuel injection valve of the fuel injection system.

2. The drain liquid treatment device according to claim 1, wherein the recovery section possesses a recovery tank that recovers the mixed drain liquid from the fuel injection system through the at least one recovery pipe, and that accumulates the ammonia-containing drain liquid containing at least one of the gas component and the oil component and the ammonia fuel.

3. The drain liquid treatment device according to claim 2, wherein the recovery tank is a gas-liquid separator that gas-liquid separates the accumulated ammonia-containing drain liquid into ammonia-containing liquid containing the oil component and the ammonia fuel, and ammonia-containing gas containing the gas component and ammonia gas vaporized from the ammonia fuel, the supply section possesses: an extraction section that extracts the ammonia component by removing the oil component from the ammonia-containing liquid; and an aqueous ammonia generation section that adds water to the ammonia-containing gas, separates the gas component and the ammonia gas, and generates aqueous ammonia containing the ammonia component as an aqueous solution of the ammonia gas.

4. The drain liquid treatment device according to claim 3, wherein one of the one or more functional sections is an exhaust gas treatment device that possesses a reactor that removes nitrogen oxides contained in exhaust gas through a reduction reaction of the nitrogen oxides with a reducing agent, a mixer that mixes the exhaust gas with the reducing agent, and a reducing agent supply section that supplies the reducing agent to the mixer, the supply section supplies the ammonia component extracted by the extraction section to the mixer.

5. The drain liquid treatment device according to claim 4, wherein the supply section adds the aqueous ammonia generated by the aqueous ammonia generation section to the reducing agent.

6. The drain liquid treatment device according to claim 3, wherein one of the one or more functional sections is a drive system of the marine diesel engine that generates driving force using energy generated by combustion of the ammonia fuel and the fossil fuel injected into the combustion chamber, the supply section injects the aqueous ammonia generated by the aqueous ammonia generation section into the combustion chamber.

7. The drain liquid treatment device according to claim 4, wherein ​ One of the one or more functional units is a drive system of the marine diesel engine, which generates driving force using energy generated by combustion of the ammonia fuel and the fossil fuel injected into the combustion chamber, The supply unit supplies the ammonia component contained in the ammonia-containing discharge liquid recovered by the recovery unit to one or more functional units that function using the ammonia component.

8. The discharge liquid treatment device according to any one of claims 1 to 7, wherein The at least one recovery pipe includes a first recovery pipe that recovers a first mixed discharge liquid in which the fossil fuel and the ammonia fuel are mixed from a fuel injection valve of the fuel injection system.

9. The discharge liquid treatment device according to any one of claims 1 to 7, wherein The at least one recovery pipe includes a third recovery pipe that recovers a third mixed discharge liquid in which a purge gas that purges the inside of a communication pipe and the ammonia fuel are mixed from the communication pipe that communicates a fuel injection valve of the fuel injection system and an ammonia pump that pressurizes and feeds the ammonia fuel to the fuel injection valve.

10. The discharge liquid treatment device according to claim 8, wherein The at least one recovery pipe includes a third recovery pipe that recovers a third mixed discharge liquid in which a purge gas that purges the inside of a communication pipe and the ammonia fuel are mixed from the communication pipe that communicates a fuel injection valve of the fuel injection system and an ammonia pump that pressurizes and feeds the ammonia fuel to the fuel injection valve.

11. A liquid discharge processing apparatus characterized by comprising: provided with: a recovery unit that communicates with a fuel injection system that injects an ammonia fuel and a fossil fuel into a combustion chamber of a marine diesel engine, and recovers an ammonia-containing discharge liquid discharged from the fuel injection system; and a supply unit that supplies an ammonia component contained in the ammonia-containing discharge liquid recovered by the recovery unit to one or more functional units that function using the ammonia component. The fuel injection system is provided with: a fuel injection valve that injects the ammonia fuel and the fossil fuel into the combustion chamber; an ammonia pump that pressurizes and feeds the ammonia fuel to the fuel injection valve; an ammonia fuel tank that accumulates the ammonia fuel supplied to the ammonia pump; and a double pipe having a first inner pipe that communicates the fuel injection valve and the ammonia pump, a first outer pipe that airtightly covers the first inner pipe, a second inner pipe that communicates the ammonia pump and the ammonia fuel tank, and a second outer pipe that airtightly covers the second inner pipe, the ammonia-containing discharge liquid is ammonia water containing the ammonia component, the recovery unit airtightly covers the ammonia pump and communicates with the double pipe, and recovers the ammonia water from the double pipe, the supply unit supplies the ammonia water to the one or more functional units.

12. The discharge liquid treatment device according to claim 11, wherein One of the one or more functional units is a collection tank of an EGR device that cleans a part of exhaust gas discharged from the marine diesel engine with scrubbing water and returns it to the marine diesel engine, which accumulates and neutralizes the acidic scrubbing water used for the cleaning, The supply section supplies the ammonia water to the collection tank.

13. The liquid discharge treatment device according to claim 11 or 12, characterized in that, One of the one or more functional sections is a drive system of the diesel engine of the ship, which generates a driving force using energy generated by combustion of the ammonia fuel and the fossil fuel injected into the combustion chamber, The supply section injects the ammonia water into the combustion chamber.

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