CN117441057A - Selective reduction catalyst system and reductant storage method - Google Patents
Selective reduction catalyst system and reductant storage method Download PDFInfo
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- CN117441057A CN117441057A CN202180096899.XA CN202180096899A CN117441057A CN 117441057 A CN117441057 A CN 117441057A CN 202180096899 A CN202180096899 A CN 202180096899A CN 117441057 A CN117441057 A CN 117441057A
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- ammonia
- water
- reduction catalyst
- selective reduction
- catalyst system
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- 239000003054 catalyst Substances 0.000 title claims abstract description 57
- 239000003638 chemical reducing agent Substances 0.000 title claims description 32
- 238000000034 method Methods 0.000 title claims description 23
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 81
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 73
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 73
- 238000002156 mixing Methods 0.000 claims abstract description 53
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000004821 distillation Methods 0.000 claims abstract description 19
- 239000013535 sea water Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 22
- 239000013505 freshwater Substances 0.000 claims description 4
- 239000000446 fuel Substances 0.000 abstract description 14
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 5
- 239000004202 carbamide Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
-
- 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
- B63H21/32—Arrangements of propulsion power-unit exhaust uptakes; Funnels peculiar to vessels
-
- 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
-
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention provides a selective reduction catalyst system that can effectively utilize liquefied ammonia used in a marine diesel engine or the like that uses ammonia as a part of fuel, and that can be used along with facilities of an existing urea water supply system in an engine or the like. A selective reduction catalyst system for connection to a marine diesel engine that uses ammonia as a portion of a fuel, comprising: a distillation unit (2) for distilling clear water from sea water; a mixing unit (3) for mixing the clean water distilled by the distillation unit (2) with liquefied ammonia to generate ammonia water; and a storage unit (5) for storing the ammonia water generated by the mixing unit (3).
Description
Technical Field
The invention relates to a selective reduction catalyst system and a method for storing a reducing agent.
Background
In a marine diesel engine that uses ammonia as a part of fuel, liquefied ammonia (hereinafter referred to as "LNH 3") is used.
On the other hand, in marine diesel engines, selective reduction catalyst units are used for removing nitrogen oxides generated by combustion of raw materials typified by heavy oil. As the reducing agent, urea aqueous solution having high safety is generally widely used.
Japanese patent application laid-open publication No. 2011-144765 (hereinafter, "patent document 1") discloses a method of using urea water as a reducing agent for a selective reduction catalyst connected to a marine diesel engine, and a selective reduction catalyst system in which safety and maintainability are important by the method.
In the technique disclosed in patent document 1, urea water is used as a reducing agent for the selective reduction catalyst from the viewpoint of corrosion resistance and the like. Therefore, the technology disclosed in patent document 1 is not a technology for effectively utilizing LNH3 or the like used in a marine diesel engine or the like that uses ammonia as a part of fuel, and using equipment of an existing urea water supply system in an engine or the like.
Disclosure of Invention
The purpose of the present invention is to provide a selective reduction catalyst system and a method for storing a reducing agent, which can effectively utilize LNH3 or the like as a part of fuel and can make use of facilities of an existing urea water supply system in an engine or the like.
The first aspect of the invention is a selective reduction catalyst system in connection with a marine diesel engine that uses ammonia as part of a fuel, wherein,
the selective reduction catalyst system has:
a distillation part that distills clear water from sea water;
a mixing unit that mixes the clean water distilled by the distillation unit with liquefied ammonia to generate ammonia water; and
and a storage unit that stores the ammonia water generated by the mixing unit.
A second aspect of the invention is a selective reduction catalyst system in connection with a marine diesel engine that uses ammonia as part of a fuel, wherein,
the selective reduction catalyst system has:
a storage unit that stores ammonia water in advance; and
a mixing unit that mixes the ammonia water and liquefied ammonia while circulating the ammonia water previously stored in the storage unit,
the reserve portion reserves the ammonia water mixed by the mixing portion.
A third aspect of the present invention is a reducing agent storage method for a selective reduction catalyst system connected to a marine diesel engine that uses ammonia as a part of fuel, wherein,
the reductant storage method includes:
distilling the clear water from the seawater;
mixing the distilled clear water with liquefied ammonia to generate ammonia water; and
and storing the generated ammonia water.
A fourth aspect of the present invention is a reducing agent storage method for a selective reduction catalyst system in connection with a marine diesel engine that uses ammonia as part of a fuel, wherein,
the reductant storage method includes:
a step of reserving ammonia water having a concentration lower than that expected by the selective reduction catalyst system in advance;
a step of mixing the ammonia water and liquefied ammonia while circulating the ammonia water stored in advance; and
a step of reserving the mixed ammonia again.
According to the selective reduction catalyst system and the reducing agent storage method of the present invention, LNH3 or the like, which is a part of fuel for a marine diesel engine, can be effectively utilized, and facilities of an existing urea water supply system in an engine or the like can be used.
Drawings
Fig. 1 is an overall view of a selective reduction catalyst system of a first embodiment.
Fig. 2 is an overall view of a selective reduction catalyst system of a second embodiment.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Various features shown in the embodiments shown below can be combined with each other.
< first embodiment >
First, the structure of the selective reduction catalyst system 1 of the first embodiment will be described.
Fig. 1 is an overall view of a selective reduction catalyst system 1 of the present embodiment. The LNH3 shown in fig. 1 is obtained by reliquefaction of ammonia gas vaporized directly from a fuel tank of a marine diesel engine in which ammonia is a part of the fuel or from the fuel tank. In order to improve the environmental compatibility, the LNH3 may be separated from the waste liquid which flows out from the marine diesel engine itself using ammonia as a part of the fuel.
The selective reduction catalyst system 1 is connected to a marine diesel engine that uses ammonia as a part of the fuel. The selective reduction catalyst system 1 has a distillation section 2, a mixing section 3, and a reserve section 5. The selective reduction catalyst system 1 may also have a flow rate adjustment section 4 mounted on the mixing section 3. The storage unit 5 stores the ammonia water produced by the mixing unit 3. The reserve unit 5 supplies ammonia water in a desired amount to the selective reduction catalyst unit 6.
The distillation unit 2 is used for drawing and distilling seawater around the ship and obtaining clean water. The seawater located around the ship is sucked by a pump or the like, regardless of the sailing or berthing of the ship. The 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, drinking water and miscellaneous water for a boiler. In addition, clean water becomes a solvent for ammonia water stored as a reducing agent. In the present embodiment, a part of clean water obtained in the distillation unit 2 and LNH3 are mixed in the mixing unit 3 to generate ammonia water.
In addition, the fresh water may be stored in the vessel without providing the distillation unit 2. In this case, the clean water is directly introduced into the mixing section 3 or introduced into the mixing section 3 via the flow rate adjusting section 4. However, the reducing agent as the selective reduction catalyst requires a large amount of ammonia water, and the clean water as its solvent is also required in a large amount. Therefore, the storage of fresh water is limited to a special operation condition such as replacement of ballast water.
The mixing section 3 mixes the clean water generated by the distillation section 2 with the LNH3. The solubility parameters of ammonia and water are values close to each other, so clean water and LNH3 are very easy to mix. Therefore, the mixing section 3 may have a stirring device function of rotating the stirring bar in one direction at a constant speed in the tank. The stirring member is, for example, rod-shaped, plate-shaped, or propeller-shaped.
The mixing section 3 is provided with a heat exchanger (not shown). The dashed line in fig. 1 represents the flow of the reaction heat generated by the heat exchanger. By removing the reaction heat, the temperature of the mixing section 3 is prevented from rising, and the amount of LNH3 dissolved can be increased. In addition, by removing the reaction heat, the pressure in the mixing section 3 is prevented from rising due to the temperature rise. Thereby, the device design becomes easy. In addition, the reaction heat generated by the reaction of LNH3 with clean water may also be used as energy for making clean water in the distillation section 2. This allows the mixing unit 3 to be cooled while the distillation unit 2 is being assisted, and thus has high environmental compatibility.
In order to use the reaction heat, the mixing section 3 itself may be a heat exchanger type reactor called a tubular reactor.
The flow rate adjusting unit 4 is a flow rate adjusting valve. The flow rate adjusting unit 4 adjusts the flow rate of the liquid such as clean water, LNH3, or ammonia water generated by the distillation unit 2.
The flow rate adjusting section 4 is preferably provided at the inlet of the mixing section 3 so that the ammonia water stored in the storage section 5 becomes a predetermined concentration. In particular, LNH3 is easily gasified and needs to be controlled. Ammonia water of a predetermined concentration is easily generated by the flow rate adjusting section 4. In addition, the operation of the stirring section 51 described later can be omitted by the flow rate adjusting section 4.
In addition, in order to adjust the concentration of ammonia, it is sometimes desirable to keep the pressure in the mixing section 3 constant. In this case, the pressure regulating valve may be used instead of the flow regulating valve, and may be changed in time according to the use condition.
The storage unit 5 stores the ammonia water generated by the mixing unit 3. The reserve unit 5 supplies ammonia water to the selective reduction catalyst unit 6 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 5. Specifically, a first concentration meter is provided in the inflow port of the reserve portion 5. A second concentration meter is provided at the outflow port of the reserve 5.
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 measurement value of the densitometer and the concentration in advance. For example, when the densitometer in the light measurement is a value of 0.912, the ammonia concentration is about 15% at normal temperature and normal pressure. The concentration of ammonia water is about 40% at maximum in the saturated state, and the higher the concentration of ammonia water supplied to the selective reduction catalyst unit 6 is, the better.
The reserve portion 5 may have a stirring portion 51 inside. In the present embodiment, the ammonia water supplied to the storage unit 5 is sufficiently stirred by the mixing unit 3 to have a uniform concentration. However, ammonia gas may sometimes partially volatilize due to the temperature gradient of the outer wall of the reservoir 5. The storage unit 5 may be any mechanism that rotates the stirring bar in the tank at a constant speed in one direction at the lower part, as in the mixing unit 3. The stirring member is, for example, rod-shaped, plate-shaped, or propeller-shaped. By making the stirring section 51 a simple structure, the cost of the entire apparatus can be reduced.
When the concentration difference between the inlet and the outlet of the reserve part 5 (the concentration difference between the first concentration meter and the second concentration meter) exceeds a certain value, the reserve part 5 automatically operates the stirring part 51. The valve to the selective reduction catalyst unit 6 is not opened until the concentration difference reaches a certain value. When the concentration difference reaches a certain value, the reserve part 5 automatically stops the stirring part 51 and opens the valve to the selective reduction catalyst unit 6.
In the piping or the like introduced into the mixing section 3 or the storage section 5, it is preferable to achieve homogenization of the ammonia concentration. When the concentration difference between the inlet and the outlet of the reserve portion 5 has reached a certain value, the stirring portion 51 is not required.
The selective reduction catalyst unit 6 is a structure body having a plurality of through holes extending in one direction to form a flow path of gas. The catalyst is supported along the inner wall of the structure defining the through-holes. Vanadium, tungsten, and platinum are formed to contain elements on the catalyst surface. The catalyst may be produced by extrusion molding using titanium oxide as a main component. Exhaust gas containing nitrogen oxides discharged from the marine diesel engine flows along the flow path. The ammonia water as a reducing agent is supplied from the reserve unit 5 at a predetermined flow rate and a predetermined concentration, whereby nitrogen oxides are removed.
Non-toxic aqueous urea is generally used as the reducing agent for the selective reduction catalyst. In contrast, in the present embodiment, LNH3 or the like, which is a part of the fuel of the marine diesel engine, can be effectively utilized, and equipment such as a pump module, a metering unit, or the like of an existing urea water supply system in an engine or the like can be used. Therefore, it is not necessary to provide a separate supply system of the reducing agent, and the cost increase of the apparatus can be suppressed.
< second embodiment >
The second embodiment will be described below. The functions and structures substantially similar to those of the first embodiment will not be described.
Fig. 2 is an overall view of the selective reduction catalyst system 1 of the present embodiment. Unlike the first embodiment, ammonia water is stored in advance in the reserve portion 5 of the present embodiment. The concentration of ammonia water previously stored in the storage portion 5 is lower than the concentration required for the selective reduction catalyst unit 6. While circulating the reserve unit 5 and the mixing unit 3, the LNH3 is mixed and raised to a desired concentration. Then, ammonia water of a desired concentration is supplied to the selective reduction catalyst unit 6. By circulating the ammonia water, the ammonia water can be adjusted to a desired concentration. Further, by circulating the ammonia water and stirring, the concentration of the ammonia water can be kept uniform. Therefore, in the present embodiment, the stirring section 51 of the first embodiment may be omitted.
The mixing unit 3 of the present embodiment mixes the ammonia water circulated from the storage unit 5 with the LNH3.
The flow rate adjusting section 4 is preferably provided in front of the mixing section 3. Ammonia water of a predetermined concentration can be easily produced by introducing ammonia water and LNH3 into the mixing section 3 at a predetermined flow rate.
In the case of the present embodiment, the chemical reaction heat in the mixing section 3 may not be used. The heat of chemical reaction of ammonia with LNH3 is less than the heat of chemical reaction of LNH3 with clean water. Further, since ammonia water is introduced into the reserve portion 5 in small amounts, a local temperature rise in the mixing portion 3 is suppressed. Therefore, in the present embodiment, a heat exchanger or the like does not need to be provided. Thereby, space saving in the ship is achieved. The clean water produced in the distillation unit 2 becomes a solvent for the ammonia water previously stored in the storage unit 5. This results in a system with high environmental compatibility.
In addition, as in the first embodiment, a heat exchanger (not shown) may be provided in the mixing section 3. The dashed line in fig. 2 represents the flow of the reaction heat generated by the heat exchanger.
The clean water produced in the distillation unit 2 may be a solvent for ammonia water. Thus, as illustrated in fig. 2, clean water can also be introduced directly into the reservoir 5. The mixing unit 3 is not provided with the flow rate adjusting unit 4, and ammonia water having an excessively high concentration can be introduced into the storage unit 5. In this case, only by such an ammonia water circulation system, an irreversible system which cannot be reduced even if the concentration of ammonia water is high can be obtained. Therefore, by directly introducing clean water into the storage unit 5, the concentration of ammonia water can be reduced.
When clean water is directly introduced into the storage unit 5, ammonia water and LNH3 are mixed in the storage unit 5. Therefore, the stirring section 51 is preferably provided at the lower portion of the reserve section 5.
On the other hand, in the present embodiment, when the fresh water generated in the distillation unit 2 is not directly introduced into the storage unit 5, the presence or absence of the stirring function in the storage unit 5 is not problematic. In this case, the reserve 5 and the mixing section 3 form a circulation line. At this time, even if ammonia gas partially volatilizes due to the temperature gradient of the outer wall of the reserve 5, the chance of ammonia water contacting each other in the circulation line can be ensured, and the concentration of ammonia water becomes uniform.
< other embodiments >
In the first embodiment or the second embodiment, the storage unit 5 may store urea water as the reducing agent in advance. At this time, the ammonia water generated by the mixing unit 3 may be introduced into the storage unit 5, and the inside may be stirred by the stirring unit 51. The effect of the reducing agent is substantially the same in urea aqueous solution and ammonia water. In this case, the equipment such as the pump module of the existing urea water supply system can be used, and the discharged carbon dioxide can be reduced.
In addition, ammonia has a smaller molecular weight than urea. Therefore, the tank of the reserve unit 5 becomes light, and the conventional tank including urea aqueous solution as the reducing agent can be made smaller. In this case, the space in the entire selective reduction catalyst system can be effectively utilized.
The various embodiments have been described above, but they are shown 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 claims and their equivalents.
Description of the reference numerals
1. Selective reduction catalyst system
2. Distillation part
3. Mixing part
4. Flow rate adjusting part
5. Storage part
51. Stirring part
6. Selective reduction catalyst unit
Claims (17)
1. A selective reduction catalyst system for connection to a marine diesel engine fuelled with ammonia, characterized in that,
the selective reduction catalyst system has:
a distillation part that distills clear water from sea water;
a mixing unit that mixes the clean water distilled by the distillation unit with liquefied ammonia to generate ammonia water; and
and a storage unit that stores the ammonia water generated by the mixing unit.
2. The selective reduction catalyst system of claim 1, further comprising:
and a heat exchanger that uses heat generated by the mixing section in the distillation section.
3. The selective reduction catalyst system according to claim 1 or 2, further comprising:
and a flow rate adjusting unit which is disposed in the mixing unit and adjusts the flow rates of the fresh water and the liquefied ammonia introduced into the mixing unit.
4. A selective reduction catalyst system for connection to a marine diesel engine fuelled with ammonia, characterized in that,
the selective reduction catalyst system has:
a storage unit that stores ammonia water in advance; and
a mixing unit that mixes the ammonia water and liquefied ammonia while circulating the ammonia water previously stored in the storage unit,
the reserve portion reserves the ammonia water mixed by the mixing portion.
5. The selective reduction catalyst system of claim 4, further comprising:
and a flow rate adjusting unit disposed in the mixing unit and configured to adjust flow rates of the ammonia water and the liquefied ammonia introduced into the mixing unit.
6. The selective reduction catalyst system according to any one of claim 1 to 5, wherein,
the reserve portion has a stirring portion that stirs the inside.
7. The selective reduction catalyst system of claim 6, wherein the catalyst system comprises,
the reserve section has:
an inflow port;
an outflow port;
a first concentration meter provided at the inflow port; and
a second concentration meter provided at the outflow port,
the reserve portion operates the stirring portion when a concentration difference between the first concentration meter and the second concentration meter exceeds a predetermined value.
8. The selective reduction catalyst system according to claim 7, wherein,
the reserve part further has a valve that regulates a flow rate of the aqueous ammonia flowing out from the outflow port,
the reserve portion closes the valve when a concentration difference between the first concentration meter and the second concentration meter exceeds a predetermined value.
9. A method of reducing agent storage for a selective reduction catalyst system in connection with a marine diesel engine fuelled with ammonia, characterized in that,
the reductant storage method includes:
distilling the clear water from the seawater;
mixing the distilled clear water with liquefied ammonia to generate ammonia water; and
and storing the generated ammonia water.
10. The reductant storage method of claim 9, further comprising:
and distilling the clean water from the seawater by using heat generated when the ammonia water is generated.
11. The reductant storage method of claim 9 or 10, further comprising:
and adjusting the flow rates of the distilled clean water and the liquefied ammonia for generating the aqueous ammonia to a predetermined mixing ratio.
12. The reductant storage method of any one of claims 9 to 11, further comprising:
stirring the stored ammonia water.
13. A reducing agent storage method as defined in claim 12 wherein,
stirring the ammonia water stored in the storage portion when a concentration difference between the ammonia water at an inflow port and an outflow port of the storage portion storing the ammonia water exceeds a predetermined value.
14. A reducing agent storage method as defined in claim 13 wherein,
when the concentration difference of the ammonia water exceeds a predetermined value, the ammonia water is stopped from flowing out from the outflow port of the storage unit.
15. The reductant storage method of any one of claims 9 to 14, further comprising:
a step of using the stored ammonia water as a reducing agent in the selective reduction catalyst system.
16. A method of reducing agent storage for a selective reduction catalyst system in connection with a marine diesel engine fuelled with ammonia, characterized in that,
the reductant storage method includes:
a step of reserving ammonia water having a concentration lower than that expected by the selective reduction catalyst system in advance;
a step of mixing the ammonia water and liquefied ammonia while circulating the ammonia water stored in advance; and
a step of reserving the mixed ammonia again.
17. The reductant storage method of claim 16, further comprising:
and adjusting the flow rate of the ammonia water and the liquefied ammonia stored in advance for mixing the ammonia water to a predetermined mixing ratio.
Applications Claiming Priority (3)
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| JP2021-120099 | 2021-07-21 | ||
| JP2021120099 | 2021-07-21 | ||
| PCT/JP2021/047531 WO2023002646A1 (en) | 2021-07-21 | 2021-12-22 | Selective catalyst reduction system and reducing-agent stockpiling method |
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| CN117441057A true CN117441057A (en) | 2024-01-23 |
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| JP (1) | JP7128383B1 (en) |
| KR (1) | KR20230158087A (en) |
| CN (1) | CN117441057A (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20230158087A (en) | 2023-11-17 |
| JPWO2023002646A1 (en) | 2023-01-26 |
| JP7128383B1 (en) | 2022-08-30 |
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