CN117716117A - Volatile ammonia gas treatment device and treatment method - Google Patents

Volatile ammonia gas treatment device and treatment method Download PDF

Info

Publication number
CN117716117A
CN117716117A CN202180100771.6A CN202180100771A CN117716117A CN 117716117 A CN117716117 A CN 117716117A CN 202180100771 A CN202180100771 A CN 202180100771A CN 117716117 A CN117716117 A CN 117716117A
Authority
CN
China
Prior art keywords
ammonia gas
ammonia
volatile
treating
mixing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202180100771.6A
Other languages
Chinese (zh)
Inventor
樱井聪一郎
服部望
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsui Yiaisi Co ltd
Original Assignee
Mitsui Yiaisi Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsui Yiaisi Co ltd filed Critical Mitsui Yiaisi Co ltd
Priority claimed from PCT/JP2021/047530 external-priority patent/WO2023021719A1/en
Publication of CN117716117A publication Critical patent/CN117716117A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9436—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/10—Mixing gases with gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/003—Storage or handling of ammonia
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/02—Preparation, purification or separation of ammonia
    • C01C1/10—Separation of ammonia from ammonia liquors, e.g. gas liquors
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/24—Sulfates of ammonium
    • C01C1/242—Preparation from ammonia and sulfuric acid or sulfur trioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Abstract

The invention provides a processing device for volatilizing ammonia, which can effectively utilize volatilizing ammonia in a liquefied ammonia carrying ship. A treatment device for volatilized ammonia gas on a ship carrying liquefied ammonia as cargo or engine fuel, comprising: a storage unit (4) for storing ammonia gas volatilized from liquefied ammonia; and a delivery unit (5) for supplying ammonia gas to a selective reduction catalyst unit (10) connected to the engine of the ship.

Description

Volatile ammonia gas treatment device and treatment method
Technical Field
The present invention relates to volatile ammonia treatment.
Background
In recent years, a technology using ammonia gas has been focused on in order to reduce environmental load. Accordingly, there is an increase in ships that carry liquefied ammonia (hereinafter referred to as "LNH 3") as cargo. In addition, the development of ammonia-incinerating engines is also advancing, and the increase of ships carrying LNH3 as an engine fuel is also expected. In a tank storing LNH3, volatile ammonia gas called boil-off gas is generated by natural heat supply or the like. While maintaining the ammonia gas generating state, the pressure in the tank increases, and thus, it is necessary to perform treatment by atmospheric release or the like. However, ammonia is toxic, and cannot release the volatile ammonia gas directly into the atmosphere, and it is necessary to remove the ammonia gas by a pest removal device or the like.
In addition, the removal, reliquefaction and return of the volatilized ammonia gas to the tank is also performed in a real machine. However, since a large amount of electric power is required for reliquefaction, this is a problem from the viewpoint of energy efficiency.
On the other hand, for the engine used in the ship, particularly for the diesel engine, a selective reduction catalyst unit is used. The selective reduction catalyst unit removes nitrogen oxides generated by combustion of a raw material typified by heavy oil. As the reducing agent, a large amount of urea aqueous solution or any one of ammonia gas, ammonia water, and an ammonia compound is required and stored in a tank.
Japanese patent application laid-open publication No. 2018-204715 (hereinafter, patent document 1) discloses a system and a method for supplying a boil-off gas generated from a storage tank of liquefied gas fuel to a gas utilization apparatus by decompression, compression, or the like.
Disclosure of Invention
The technique disclosed in patent document 1 requires a compressor and a storage device. Therefore, the pipelines and the like provided in the ship cannot be effectively utilized. In particular, in the LNH 3-mounted ship, a supply pipe or the like for the reducing agent cannot be used for the selective reduction catalyst unit. In order to effectively utilize the volatile ammonia gas, an additional facility is required.
The invention aims to provide a volatile ammonia gas treatment device and a treatment method capable of effectively utilizing volatile ammonia gas.
A first aspect of the present invention is a treatment apparatus for volatilized ammonia gas on a ship carrying liquefied ammonia as cargo or engine fuel,
the volatile ammonia gas treatment device comprises:
a housing portion that houses ammonia gas volatilized from the liquefied ammonia; and
and a delivery unit that supplies the ammonia gas to a selective reduction catalyst unit connected to an engine of the ship.
A second aspect of the present invention is a treatment apparatus for volatilized ammonia gas on a ship carrying liquefied ammonia as cargo or engine fuel,
the volatile ammonia gas treatment device comprises:
a housing portion that houses ammonia gas volatilized from the liquefied ammonia;
a transport unit that supplies the ammonia gas;
a mixing unit that mixes the ammonia gas supplied from the transport unit with a solvent to generate an ammonia compound; and
and a storage unit that stores the ammonia compound generated in the mixing unit.
A third aspect of the present invention is a method for treating a ship carrying liquefied ammonia as cargo or engine fuel with volatilized ammonia,
the volatile ammonia gas treatment method comprises the following steps:
accommodating ammonia volatilized from the liquefied ammonia into an accommodating portion; and
and supplying the ammonia gas stored in the storage unit to a selective reduction catalyst unit connected to an engine of the ship.
A fourth aspect of the present invention is a method for treating a ship carrying liquefied ammonia as cargo or engine fuel,
the volatile ammonia gas treatment method comprises the following steps:
accommodating ammonia volatilized from the liquefied ammonia into an accommodating portion;
supplying the ammonia gas contained in the containing portion to a mixing portion;
mixing the ammonia gas supplied to the mixing section with a solvent to produce an ammonia compound; and
the ammonia compound generated in the mixing section is stored.
According to the volatile ammonia gas treatment device and the volatile ammonia gas treatment method, the volatile ammonia gas can be effectively utilized.
Drawings
Fig. 1 is a schematic view of a volatile ammonia gas treating device according to a first embodiment.
Fig. 2 is an overall view of the volatile ammonia gas treating device according to the second embodiment.
Fig. 3 is an overall view of a volatile ammonia gas treating device according to a third embodiment.
Symbol description
1 volatile ammonia gas treatment device
2 ammonia fuel tank
3 ammonia tank for goods
4 accommodating portion
5 conveying part
6 distillation unit
7 flow rate adjusting part
8 mixing part
81 shower nozzle
9 stores
91 stirring part
10 selective reduction catalyst unit
Detailed Description
Hereinafter, embodiments will be described with reference to the drawings. Various features shown in the embodiments shown below can be combined with each other.
< first embodiment >
The configuration of the volatile ammonia gas processing device 1 according to the present embodiment will be described.
Fig. 1 is a schematic view of a volatile ammonia gas treating device 1 according to the present embodiment. The volatile ammonia gas treating device 1 has a housing portion 4 and a conveying portion 5. The storage unit 4 stores volatile ammonia gas generated by the LNH3 stored in the ammonia tank 2 and the ammonia tank 3 for cargo. As shown in fig. 1, the transport section 5 directly supplies ammonia gas to the selective reduction catalyst unit 10 by a blower or the like.
The ammonia fuel tank 2 stores ammonia as a part of fuel used in a main engine of a marine engine or the like. Ammonia is stored as LNH3 in the ammonia fuel tank 2. In order to maintain the liquid state of the LNH3, the ammonia fuel tank 2 maintains the inside at a high pressure or a low temperature.
When a larger amount of LNH3 is mounted on a ship in long-term navigation or the like, a total reflection type (large air pressure type) and a half reflection type (half pressurization type) which are easy to process and have a reduced wall thickness are mainly used for the ammonia fuel tank 2. Therefore, evaporated gas due to natural heat supply or the like is generated. Therefore, in order to maintain the ammonia fuel tank 2 in the liquid state of the LNH3, a reliquefaction device is required. The volatilized ammonia gas from the ammonia tank 2 and the volatilized ammonia gas from the ammonia tank 3 for cargo, which will be described later, are sent to the storage section 4 without going through the reliquefaction device.
The ammonia tank 3 for cargo stores LNH3 as cargo, not fuel used in a main engine or the like of a marine engine. In the cargo ammonia tank 3, the cargo ammonia tank 3 is kept at a high pressure or a low temperature in order to maintain the liquid state of the LNH3, as in the ammonia fuel tank 2.
When a large amount of LNH3 is mounted on a ship, a total reflection type (atmospheric pressure type) and a half reflection type (half pressure type) which are easy to process and have a reduced wall thickness are mainly used for the ammonia tank 3 for cargo. Therefore, evaporated gas due to natural heat supply or the like is generated. Therefore, in order to maintain the ammonia tank 3 for cargo with only LNH3, a reliquefaction device is required. The reliquefaction device compresses or condenses the vaporized ammonia gas, and thus requires a large power.
The volatilized ammonia gas from the cargo ammonia tank 3 and the volatilized ammonia gas from the ammonia fuel tank 2 are transported to the accommodating portion 4 without passing through the reliquefaction device.
The storage unit 4 stores the volatile ammonia gas from the ammonia tank 2 and the ammonia tank 3 for cargo. The ammonia tank 2 and the ammonia tank 3 for cargo hold the inside at a high pressure or a low temperature so as to maintain the liquid state as described above. However, even so, volatile ammonia gas is present as the evaporation gas. The volatile ammonia gas is sent to the storage portion 4 via a pressure reducing valve or the like. A pressure reducing valve or the like is provided at an upper portion of the ammonia tank 2 or the ammonia tank 3 for cargo.
As shown in fig. 1, the transport unit 5 of the present embodiment directly supplies the ammonia gas fed from the storage unit 4 to the selective reduction catalyst unit 10. The conveying section 5 has a conveying function such as a blower. This allows ammonia gas to be supplied or transported through a pipe or the like.
In the case where the liquid reducing agent is supplied to the selective reduction catalyst, it is necessary to gasify the reducing agent, and in the present embodiment, the ammonia gas in the gaseous state is supplied to the selective reduction catalyst unit 10 via the transport section 5, so that the time and effort for gasifying the reducing agent can be omitted.
In order to directly supply or transport the ammonia gas, the material of the housing portion 4 and the transport portion 5 is preferably a corrosion-resistant material that prevents stress corrosion cracking.
The conveying section 5 as a whole is not particularly limited as long as it can be manufactured by a material that is less prone to stress corrosion cracking and a welding method.
The selective reduction catalyst unit 10 is a structure having a plurality of through holes extending in one direction so as to form a flow path of gas. The catalyst is supported along the inner wall of the structure defining the through-hole. The surface of the catalyst is composed of vanadium, tungsten and platinum. The catalyst may be produced by extrusion molding using titanium oxide as a main component. Exhaust gas containing nitrogen oxides flowing out from a main engine or the like of the marine engine flows along the flow path. Ammonia as a reducing agent is supplied from the transport unit 5 at a predetermined flow rate and a predetermined concentration, whereby nitrogen oxides are removed.
In addition, the selective reduction catalyst unit 10 is not particularly required for a diesel engine only. If nitrogen oxides are also generated in the gas engine or the like, the selective reduction catalyst unit 10 is connected to a main engine or the like of the engine.
Further, the flow rate adjusting portion 7 may be provided immediately before the selective reduction catalyst unit 10.
Ammonia is often used or stored in a ship that mounts LNH3 as cargo, such as a main engine of a ship engine that uses ammonia as a part of fuel. Therefore, there is no need for urea water as a reducing agent, which is widely used when a selective reduction catalyst is used. The urea water and ammonia have approximately the same effect as the reducing agent.
When ammonia is used as the reducing agent, the exhaust carbon dioxide can be reduced by using an existing urea water supply pipe. Specifically, after the pressure conditions of the ammonia gas satisfying the design conditions of the urea water supply pipe are studied, the ammonia gas is supplied by a gas compressor or a pressure regulating valve. Therefore, an isolation valve and a bypass line for the gas supply line may be provided before and after the liquid supply pump.
Further, since the LNH3 is easily gasified, the ammonia gas retained in the upper parts of the ammonia tank 2 and the cargo ammonia tank 3 can be directly used as a reducing agent for the selective reduction catalyst. Thus, the reliquefaction device is compactly arranged or is not needed, thereby contributing to energy saving. In addition, the space in the ship can be effectively utilized. Ammonia is toxic and therefore requires a pest control device, but can reduce the load on the pest control device.
In addition, the selective reduction catalyst unit 10 is not only required for a diesel engine. Therefore, when the engine of the LNH 3-mounted ship does not use ammonia as fuel, the ammonia volatilized from the cargo ammonia tank 3 is supplied to the selective reduction catalyst unit 10. In this case, there is no relation to the kind of engine.
Similarly, when ammonia is used as fuel in a host machine or the like of an engine on which the LNH3 is mounted, ammonia from either one of the ammonia tank 2 and the cargo ammonia tank 3 and ammonia from a mixture of both are supplied to the selective reduction catalyst unit 10.
< second embodiment >
The second embodiment will be described below. The functions and configurations substantially similar to those of the first embodiment will not be described.
Fig. 2 is an overall view of the volatile ammonia gas treating device 1 according to the present embodiment. Unlike the first embodiment, the ammonia gas stored in the storage portion 4 from the ammonia tank 2 and the ammonia tank 3 for cargo is not directly supplied to the selective reduction catalyst unit 10 via the transport portion 5. The volatile ammonia gas processing device 1 of the present embodiment includes a housing portion 4, a conveying portion 5, a distillation portion 6, a mixing portion 8, and a storage portion 9. The volatile ammonia gas processing device 1 may have a flow rate adjusting section 7 attached to the mixing section 8. In the present embodiment, ammonia gas stored in the storage portion 4 from the ammonia tank 2 and the ammonia tank 3 for cargo is supplied to the lower portion of the mixing portion 8.
In order to improve the environmental compatibility, ammonia may be recovered from a waste liquid flowing out of a marine diesel engine itself that uses ammonia as a part of fuel, and the LNH3 separated therefrom may be gasified.
The distillation unit 6 is used for drawing seawater around the ship and distilling the seawater to obtain clean water. The seawater located around the ship is taken in by a pump or the like, whether the ship is underway or moored. Clean water is mainly used as cooling water for a main engine, a generator, and an air compressor in a marine diesel engine, and is also used as water supply to a boiler, beverage water, and miscellaneous water. As shown in fig. 2, ammonia gas is dissolved in clean water by the mixing section 8 to generate ammonia water.
The flow rate adjusting unit 7 is a flow rate adjusting valve. The flow rate adjusting unit 7 adjusts the flow rate of the liquid such as clean water generated by the distillation unit 6. The flow rate adjusting unit 7 adjusts the flow rate of the gas such as ammonia gas.
In order to set the ammonia water stored in the storage unit 9 to a predetermined concentration, the flow rate adjustment unit 7 is preferably provided at the inlet of the mixing unit 8. The flow rate adjusting section 7 facilitates the production of ammonia water having a predetermined concentration. The operation of the stirring section 91, which will be described later, can be omitted by the flow rate adjusting section 7.
The mixing section 8 mixes the clean water generated in the distillation section 6 with ammonia gas. Ammonia is very soluble in water and therefore dissolves well into the fresh water in a liquid state. The mixing section 8 has a shower head 81 at the upper inside. The shower head 81 sprays clean water generated in the distillation unit 6. Thereby, ammonia gas lighter than air dissolves into the clean water in the upper liquid state. Ammonia water is stored in the lower part of the mixing section 8.
Further, since ammonia is easily dissolved in water, the stirring section may not be provided in the mixing section 8.
In the case of a exothermic reaction caused by contact of water with LNH3, the temperature of the water rises only to about 30 degrees. In contrast, the temperature of water was raised to about 90 degrees by the exothermic reaction caused by the contact of water with ammonia gas. In order to remove the reaction heat, a heat exchanger (not shown) is provided in the mixing section 8. The temperature rise is prevented by removing the heat of reaction of ammonia gas with water, and the amount of ammonia gas dissolved increases. Further, the pressure of the mixing section 8 is prevented from rising due to the temperature rise. Thereby, the device design becomes easy. The reaction heat generated by the reaction of the ammonia gas with the clean water can also be used as energy for producing the clean water in the distillation unit 6.
In order to use the reaction heat, the mixing section 8 itself may be a heat exchanger type reactor such as a tube reactor.
The storage unit 9 stores the ammonia water generated in the mixing unit 8. The storage unit 9 supplies ammonia water to the selective reduction catalyst unit 10 at a predetermined flow rate and a predetermined concentration. Therefore, it is preferable to provide a concentration meter or the like (not shown) at the inflow port and the outflow port of the reserve portion 9. Specifically, a first concentration meter is provided in the inflow port of the reserve portion 9. A second concentration meter is provided at the outflow port of the reserve portion 9.
Further, a densitometer that is easier to measure than a densitometer may be provided. In this case, it is necessary to obtain a relationship between the measured value of the densitometer and the concentration in advance. For example, when the densitometer used in the optical measurement is a value of 0.912, the ammonia concentration becomes about 15% at normal temperature and normal pressure. The concentration of ammonia water is preferably about 40% at maximum in the saturated state, and the higher the concentration of ammonia water supplied to the selective reduction catalyst unit 10 is.
The reserve portion 9 may have a stirring portion 91 inside. In the present embodiment, the ammonia water supplied from the outflow port of the mixing unit 8 to the storage unit 9 has a uniform concentration. However, the ammonia gas may partially volatilize due to the temperature gradient of the outer wall of the reserve portion 9. The storage unit 9 may have a mechanism for rotating the stirring bar in one direction at a constant speed in the tank at the lower part. The stirring member is, for example, rod-shaped, plate-shaped, or propeller-shaped.
In order to supply ammonia water to the selective reduction catalyst unit 10 at a predetermined concentration and a predetermined flow rate, the stirring section 91 preferably operates in conjunction with a densitometer or a densitometer provided at the inlet and outlet of the storage section 9. When the concentration difference between the inlet and the outlet of the reserve portion 9 (the concentration difference between the first concentration meter and the second concentration meter) exceeds a certain constant value, the reserve portion 9 automatically operates the stirring portion 91. The valve to the selective reduction catalyst unit 10 is not opened until the concentration difference reaches a constant value. When the concentration difference reaches a constant value, the reserve unit 9 automatically stops the stirring unit 91 and opens the valve to the selective reduction catalyst unit 10.
On the other hand, it is preferable to achieve homogenization of the ammonia concentration in the piping or the like introduced into the mixing section 8 and the storage section 9. When the concentration difference between the inlet and the outlet of the reserve portion 9 reaches a certain constant value, the stirring portion 91 is not required.
According to the present embodiment, a large amount of volatile ammonia gas from the ammonia tank 2 and the ammonia tank 3 for cargo can be stored temporarily in the storage unit 9 even when the amount of volatile ammonia gas supplied to the selective reduction catalyst unit 10 as the reducing agent exceeds the amount. Thereby, the volatile ammonia gas can be effectively utilized.
Depending on the degree of diffusion of ammonia gas in the mixing section 8, the concentration of ammonia water produced may vary. In this case, the concentration of ammonia water is made uniform by the stirring section 91 located at the lower portion of the storage section 9.
According to the present embodiment, ammonia water can be supplied to the selective reduction catalyst unit 10 at a predetermined concentration and a predetermined flow rate, and nitrogen oxides contained in the exhaust gas from the engine can be effectively removed.
< third embodiment >
A third embodiment will be described below. The functions and configurations substantially similar to those of the first and second embodiments will not be described.
Fig. 3 is an overall view of the volatile ammonia gas treating device 1 according to the present embodiment. Unlike the second embodiment, the ammonia compound generated in the mixing section 8 is not directly supplied from the reserve section 9 to the selective reduction catalyst unit 10. The solvent of the ammonia compound generated in the mixing section 8 of the present embodiment is clean water or sulfuric acid.
Further, sulfuric acid is supplied to the mixing section 8 of the present embodiment via the flow rate adjusting section 7. The mixing section 8 mixes the supplied sulfuric acid with ammonia gas. Ammonia is very soluble in water and therefore can dissolve well into sulfuric acid in a liquid state. The mixing section 8 has a shower head 81 at the upper inside. The spray head 81 sprays sulfuric acid supplied to the mixing section 8. Thereby, ammonia gas lighter than air dissolves into sulfuric acid in an upper liquid state. Further, ammonium sulfate is stored in the lower portion of the mixing section 8.
When clean water is supplied to the mixing section 8 as a solvent for an ammonia compound, ammonia water is generated. On the other hand, when sulfuric acid is supplied to the mixing section 8 as a solvent for an ammonia compound, ammonium sulfate is produced. Therefore, the solvent introduced into the mixing section 8 is appropriately selected in accordance with use, sales, and the like on land.
The solvent for the ammonia compound is not limited to clean water and sulfuric acid.
The storage unit 9 of the present embodiment stores and stores ammonia water or ammonium sulfate generated in the mixing unit 8 for sale on land and the like. In order to be usable immediately after unloading, a concentration meter or the like is preferably provided in the inlet of the storage portion 9 so as to have a predetermined concentration. As in the second embodiment, a densitometer may be provided in the inlet of the storage unit 9.
Ammonia gas vaporized from the ammonia tank 2 and the cargo ammonia tank 3 is toxic. Therefore, it is necessary to discard it using a pest removal device. Unlike the second embodiment, the catalyst is not used for selective reduction, but is stored in the storage unit 9 in the present embodiment so as to be usable on land. This can reduce the load on the pest control device and can use the ammonia compound for vending and the like.
When a large amount of ammonia gas volatilized from the ammonia tank 2 and the cargo ammonia tank 3 exceeds the amount supplied as a reducing agent to the selective reduction catalyst unit 10, the ammonia compound (ammonia water or ammonium sulfate) can be temporarily stored in the storage unit 9. Therefore, the catalyst can be used in combination for use in vending on land and the like and for use in supplying the selective reduction catalyst unit 10.
< other embodiments >
The volatile ammonia gas treating devices 1 according to the first to third embodiments may be configured as follows.
Not only the ammonia gas volatilized from the ammonia tank 2 and the cargo ammonia tank 3, but also the ammonia gas volatilized from a fuel supply line to a main engine or the like of the engine may be accommodated in the accommodating portion 4.
This can reduce the load on the pest control device.
In the second or third embodiment, the reaction heat generated in the mixing section 8 can also be used as energy for producing clean water in the distillation section 6 by reacting ammonia gas with clean water.
This allows the mixing section 8 to be cooled simultaneously with the auxiliary distillation section 6, and thus has high environmental compatibility.
In order to use the reaction heat, the mixing section 8 itself may be a heat exchanger type reactor such as a tube reactor. Here, the broken lines in fig. 2 and 3 indicate the flow of the reaction heat. Ammonia is stored in the lower part of the mixing section 8. Therefore, in order to further facilitate the use of the heat of chemical reaction, a heat exchanger or the like is preferably provided also in the lower portion of the mixing section 8.
A sensor for measuring nitrogen oxides may be attached to the lower part of the selective reduction catalyst unit 10 of the second embodiment, and the flow rate of the ammonia water supplied from the reserve unit 9 may be adjusted by feedback control. Even when the concentration of the nitrogen oxides discharged varies depending on the operating condition of the engine, the supply amount of the ammonia water from the reserve unit 9 can be adjusted, and the device can be a highly efficient device with higher environmental regulations.
In addition, not only the supply amount of ammonia water in the storage unit 9 but also the concentration of ammonia water generated in the mixing unit 8 and supplied to the storage unit 9 may be adjusted. In this case, too, the total amount of reducing agent required for the removal of nitrogen oxides is supplied to the selective reduction catalyst unit 10. In particular, in the case where ammonia water is hardly stored in the storage portion 9, the concentration of ammonia water supplied to the storage portion 9 is preferably adjusted.
While various embodiments have been described above, they are presented by way of example and are not intended to limit the scope of the invention. The new embodiment can be implemented in various other modes, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. The present embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the scope of protection and the equivalent scope thereof.

Claims (12)

1. A volatile ammonia gas treatment device is characterized in that the volatile ammonia gas treatment device is a treatment device for volatile ammonia gas on a ship carrying liquefied ammonia as cargo or engine fuel,
the volatile ammonia gas treatment device comprises:
a housing portion that houses ammonia gas volatilized from the liquefied ammonia; and
and a delivery unit that supplies the ammonia gas to a selective reduction catalyst unit connected to an engine of the ship.
2. A volatile ammonia gas treatment device is characterized in that the volatile ammonia gas treatment device is a treatment device for volatile ammonia gas on a ship carrying liquefied ammonia as cargo or engine fuel,
the volatile ammonia gas treatment device comprises:
a housing portion that houses ammonia gas volatilized from the liquefied ammonia;
a transport unit that supplies the ammonia gas;
a mixing unit that mixes the ammonia gas supplied from the transport unit with a solvent to generate an ammonia compound; and
and a storage unit that stores the ammonia compound generated in the mixing unit.
3. A volatile ammonia gas treating device as defined in claim 2, wherein,
also has a distillation part for distilling the clear water from the seawater,
the mixing section mixes the clean water distilled by the distillation section with the ammonia gas supplied from the transporting section to generate ammonia water.
4. A volatile ammonia gas treating device as defined in claim 2 or 3, wherein,
the mixing section mixes the sulfuric acid supplied to the mixing section and the ammonia gas supplied from the transporting section to generate ammonium sulfate.
5. A volatile ammonia gas treating device as defined in any one of claims 1 to 4,
the accommodating portion accommodates the ammonia gas volatilized from a supply line of the engine fuel.
6. A volatile ammonia gas treating device as defined in any one of claims 3 to 5,
the distillation section uses heat generated in the mixing section.
7. A method for treating volatile ammonia gas, characterized in that the method for treating volatile ammonia gas is a method for treating volatile ammonia gas on a ship carrying liquefied ammonia as cargo or engine fuel,
the volatile ammonia gas treatment method comprises the following steps:
accommodating ammonia volatilized from the liquefied ammonia into an accommodating portion; and
and supplying the ammonia gas stored in the storage unit to a selective reduction catalyst unit connected to an engine of the ship.
8. A method for treating volatile ammonia gas, characterized in that the method for treating volatile ammonia gas is a method for treating volatile ammonia gas on a ship carrying liquefied ammonia as cargo or engine fuel,
the volatile ammonia gas treatment method comprises the following steps:
accommodating ammonia volatilized from the liquefied ammonia into an accommodating portion;
supplying the ammonia gas contained in the containing portion to a mixing portion;
mixing the ammonia gas supplied to the mixing section with a solvent to produce an ammonia compound; and
the ammonia compound generated in the mixing section is stored.
9. A method of treating volatile ammonia gas as in claim 8, further comprising:
the distillation part distills clear water from seawater,
and mixing the ammonia gas supplied to the mixing section with the clean water distilled by the distillation section to generate ammonia water.
10. A method of treating a volatile ammonia gas as in claim 8 or 9, further comprising:
sulfuric acid is supplied to the mixing section,
and mixing the sulfuric acid supplied to the mixing section with the ammonia gas to produce ammonium sulfate.
11. A method of treating volatile ammonia gas according to any one of claims 7 to 10, further comprising:
the accommodating portion accommodates the ammonia gas volatilized from a supply line of the engine fuel.
12. A method of treating volatile ammonia gas according to any one of claims 9 to 11, further comprising:
the clean water is distilled from the sea water by using heat generated in the mixing section.
CN202180100771.6A 2021-08-19 2021-12-22 Volatile ammonia gas treatment device and treatment method Pending CN117716117A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2021133731 2021-08-19
JP2021-133731 2021-08-19
PCT/JP2021/047530 WO2023021719A1 (en) 2021-08-19 2021-12-22 Volatile ammonia gas treatment device and treatment method

Publications (1)

Publication Number Publication Date
CN117716117A true CN117716117A (en) 2024-03-15

Family

ID=83103198

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202180100771.6A Pending CN117716117A (en) 2021-08-19 2021-12-22 Volatile ammonia gas treatment device and treatment method

Country Status (3)

Country Link
JP (1) JP7128382B1 (en)
KR (1) KR20230169335A (en)
CN (1) CN117716117A (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5287265B2 (en) * 2009-01-08 2013-09-11 トヨタ自動車株式会社 Ammonia combustion internal combustion engine
KR102234540B1 (en) * 2017-05-11 2021-03-31 삼성중공업 주식회사 Power generating apparatus
JP2018204715A (en) 2017-06-06 2018-12-27 株式会社Ihi Boil-off gas treatment system and method
KR102111503B1 (en) * 2019-05-14 2020-05-15 대우조선해양 주식회사 Fuel Supply System of Eco-friendly Ship
JP7344019B2 (en) * 2019-06-24 2023-09-13 株式会社ジャパンエンジンコーポレーション Marine internal combustion engine
CN111392019B (en) * 2020-03-27 2022-04-08 大连船舶重工集团有限公司 Clean ship power system who discharges
KR102231449B1 (en) * 2020-06-24 2021-03-25 대우조선해양 주식회사 Apparatus for reducing greenhouse gas emission in vessel and vessel including the same

Also Published As

Publication number Publication date
JP7128382B1 (en) 2022-08-30
JPWO2023021719A1 (en) 2023-02-23
KR20230169335A (en) 2023-12-15

Similar Documents

Publication Publication Date Title
JP6175510B2 (en) Method and apparatus for urea regulation and injection control in a selective catalytic reduction system
WO2017094915A1 (en) Combustion engine exhaust gas purifying facility
CN117355461A (en) Ship
JP2005186815A (en) Fuel feed device to gas burning internal combustion engine such as gas turbine and lng vessel provided with this
CN117716117A (en) Volatile ammonia gas treatment device and treatment method
KR20180078234A (en) Method and apparatus for treating boil-off gas for the purpose of feeding at least one engine
GB2394192A (en) Urea solution storage for exhaust gas treatment
KR20190042293A (en) Volatile organic compounds treatment system and ship having the same
WO2023021719A1 (en) Volatile ammonia gas treatment device and treatment method
CN117425768A (en) Device and method for treating surplus ammonia
CN217950524U (en) Fuel supply system for ship
KR20180086566A (en) Nitrogenous compound emission reduction apparatus and operation method in ship
JP2007292180A (en) Cold insulation circulation system of liquefied gas facility
EP3882440A1 (en) Device and method for providing a reducing agent
KR102248129B1 (en) Cooling Device Of Urea Solution For Ship
KR102552858B1 (en) Ammonia gas treatment system and ammonia-propelled vessel including the same
JP7466747B1 (en) Ammonia gas treatment device and treatment method
KR101801730B1 (en) Fuel gas managemant and supply system in ships
JP7128383B1 (en) Selective reduction catalyst system and reducing agent storage method
KR102503175B1 (en) Vessel using ammonia as fuel
WO2023002646A1 (en) Selective catalyst reduction system and reducing-agent stockpiling method
JP2023168655A (en) Selective reduction catalyst system and reductant spray method
WO2022254735A1 (en) Apparatus and method for processing excess ammonia
KR102261776B1 (en) Crude Oil Carrier
KR102469960B1 (en) Bunkering Vessel

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination