WO2023002646A1 - 選択式還元触媒システムおよび還元剤備蓄方法 - Google Patents
選択式還元触媒システムおよび還元剤備蓄方法 Download PDFInfo
- Publication number
- WO2023002646A1 WO2023002646A1 PCT/JP2021/047531 JP2021047531W WO2023002646A1 WO 2023002646 A1 WO2023002646 A1 WO 2023002646A1 JP 2021047531 W JP2021047531 W JP 2021047531W WO 2023002646 A1 WO2023002646 A1 WO 2023002646A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ammonia
- unit
- water
- reduction catalyst
- selective reduction
- Prior art date
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 53
- 239000003638 chemical reducing agent Substances 0.000 title claims description 31
- 238000000034 method Methods 0.000 title claims description 21
- 229940124024 weight reducing agent Drugs 0.000 title 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 84
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 77
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 77
- 238000002156 mixing Methods 0.000 claims abstract description 51
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 32
- 238000004821 distillation Methods 0.000 claims abstract description 18
- 239000000446 fuel Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000013535 sea water Substances 0.000 claims abstract description 8
- 239000013505 freshwater Substances 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 15
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 abstract description 13
- 238000006722 reduction reaction Methods 0.000 description 33
- 238000006243 chemical reaction Methods 0.000 description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 239000002904 solvent Substances 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 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
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 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
- 238000009434 installation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 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
Images
Classifications
-
- 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
- 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
-
- 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
Definitions
- the present invention relates to a selective reduction catalyst system and a reducing agent storage method.
- a marine diesel engine that uses ammonia as part of its fuel uses liquefied ammonia (hereinafter referred to as "LNH3").
- LNH3 liquefied ammonia
- a selective reduction catalyst unit is used to remove nitrogen oxides generated by combustion of raw materials such as heavy oil.
- urea water which is generally considered to be highly safe, is widely used.
- Patent Document 1 discloses a method of using urea water as a reducing agent of a selective reduction catalyst connected to a marine diesel engine, and safety and maintainability by the method. A focused selective reduction catalyst system is disclosed.
- Patent Document 1 uses urea water as a reducing agent for a selective reduction catalyst from the viewpoint of corrosion resistance. Therefore, the technology disclosed in Patent Document 1 makes effective use of LNH3 and the like used in marine diesel engines that use ammonia as part of the fuel, while diverting the existing facilities of the urea water supply system in engines and the like. is not.
- An object of the present invention is to provide a selective reduction catalyst system and a reducing agent storage method that can utilize existing urea water supply system equipment in an engine or the like while effectively using LNH3 or the like as part of the fuel. .
- a first aspect of the present invention is A selective reduction catalyst system connected to a marine diesel engine using ammonia as part of its fuel, a distillation section for distilling clear water from seawater; a mixing unit that mixes the clear water distilled in the distillation unit and liquefied ammonia to generate ammonia water; a storage unit that stores the aqueous ammonia generated in the mixing unit;
- a selective reduction catalyst system having
- a second aspect of the present invention is A selective reduction catalyst system connected to a marine diesel engine using ammonia as part of its fuel, a storage unit that stores ammonia water in advance; a mixing unit that mixes the ammonia water and liquefied ammonia while circulating the ammonia water that has been stored in advance in the storage unit; has The storage unit stores the aqueous ammonia mixed by the mixing unit. It is a selective reduction catalyst system.
- a third aspect of the present invention is A reducing agent storage method in a selective reduction catalyst system connected to a marine diesel engine using ammonia as a part of fuel, Distilling clear water from seawater, Mixing the distilled clear water and liquefied ammonia to produce ammonia water, stockpiling the generated ammonia water; This is a method of stockpiling a reducing agent.
- a fourth aspect of the present invention is A reducing agent storage method in a selective reduction catalyst system connected to a marine diesel engine using ammonia as a part of fuel, stockpiling ammonia water in advance with a concentration lower than that desired in the selective reduction catalyst system; Mixing the ammonia water and liquefied ammonia while circulating the ammonia water stored in advance, stockpiling the mixed ammonia water again; This is a method of stockpiling a reducing agent.
- FIG. 1 is an overall view of a selective catalytic reduction system 1 of this embodiment.
- the LNH3 shown in FIG. 1 is directly from the fuel tank of a marine diesel engine that uses ammonia as part of its fuel, or is obtained by reliquefying ammonia gas vaporized from the fuel tank.
- LNH3 may be obtained by collecting and separating waste liquid from a marine diesel engine using ammonia as part of its fuel.
- the selective reduction catalyst system 1 is connected to a marine diesel engine that uses ammonia as part of its fuel.
- the selective reduction catalyst system 1 has a distillation section 2 , a mixing section 3 and a storage section 5 .
- the selective reduction catalyst system 1 may have a flow rate adjusting section 4 attached to the mixing section 3 .
- the storage unit 5 stores the aqueous ammonia produced by the mixing unit 3 .
- the storage unit 5 supplies the required amount of ammonia water to the selective reduction catalyst unit 6 .
- the distilling section 2 is for pumping up and distilling seawater located around the ship to obtain fresh water. Whether the ship is in operation or at berth, seawater located around the ship is taken up by pumps or the like.
- Fresh water is mainly used as cooling water for main engines, generator engines, and air compressors in marine diesel engines, and is also used as water supply to boilers, drinking water, and miscellaneous service water.
- fresh water becomes a solvent for ammonia water to be stored as a reducing agent.
- part of the clear water obtained by the distillation section 2 and LNH3 are mixed in the mixing section 3 to generate aqueous ammonia.
- fresh water may be stored in the ship without installing the distillation unit 2.
- fresh water is introduced into the mixing section 3 directly or through the flow rate adjusting section 4 .
- a large amount of aqueous ammonia is required as a reducing agent for the selective reduction catalyst, and a large amount of clear water is also required as its solvent. Therefore, when fresh water is stored, it is limited only to special operating conditions, such as using it as a substitute for ballast water.
- the mixing section 3 mixes the fresh water produced in the distillation section 2 with LNH3. Since the solubility parameters of ammonia and water are close to each other, clear water and LNH3 mix very easily. Therefore, the mixing section 3 may have a stirrer function that rotates the stirrer in one direction at a constant speed in the tank.
- the stirrer is, for example, rod-shaped, plate-shaped, or propeller-shaped.
- a heat exchanger (not shown) is installed in the mixing section 3 .
- the dashed line in FIG. 1 represents the flow of reaction heat through the heat exchanger.
- the temperature rise of the mixing section 3 can be prevented, and the amount of LNH3 dissolved can be increased.
- the pressure rise in the mixing section 3 due to the temperature rise is prevented. This facilitates device design.
- reaction heat generated by the reaction of LNH3 with fresh water can be used as energy for producing fresh water in the distillation section 2.
- the mixing section 3 can be cooled at the same time as assisting the distillation section 2, so that environmental friendliness is high.
- the mixing section 3 itself may be a heat exchanger type reactor such as a tubular reactor.
- the flow rate adjustment unit 4 is a flow rate adjustment valve.
- the flow rate adjusting section 4 adjusts the flow rates of liquids such as fresh water, LNH3, and aqueous ammonia generated in the distillation section 2 .
- the flow rate adjusting unit 4 is preferably installed at the inlet of the mixing unit 3 so that the ammonia water stored in the storage unit 5 has a predetermined concentration.
- LNH3 is easily vaporized and needs to be controlled.
- Ammonia water having a predetermined concentration is easily generated by the flow rate adjusting unit 4 .
- the operation of the later-described stirring unit 51 can be omitted by the flow rate adjusting unit 4 .
- a pressure control valve may be used, which can be changed as appropriate according to usage conditions.
- the storage unit 5 stores the ammonia water produced by the mixing unit 3 .
- the storage 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 install a densitometer or the like (not shown) at the inlet and outlet of the storage unit 5 .
- a first densitometer is provided at the inlet of the storage unit 5 .
- a second densitometer is provided at the outlet of the storage unit 5 .
- a density meter which is easier to measure than the densitometer, may be installed. In that case, it is necessary to acquire in advance the relationship between the measured value of the density meter and the concentration.
- the ammonia water concentration is about 15% at normal temperature and normal pressure.
- the ammonia water concentration is about 40% at maximum in a saturated state, and the higher the concentration of the ammonia water supplied to the selective reduction catalyst unit 6, the better.
- the storage unit 5 may have a stirring unit 51 inside.
- the aqueous ammonia supplied to the storage unit 5 is sufficiently stirred in the mixing unit 3 and has a uniform concentration.
- the ammonia gas may partially volatilize.
- the storage section 5 may have a mechanism in the lower part that rotates a stirrer in one direction at a constant speed in the tank.
- the stirrer is, for example, rod-shaped, plate-shaped, or propeller-shaped.
- the stockpile unit 5 automatically activates the stirring unit 51 .
- the valve to the selective reduction catalyst unit 6 is not opened until the concentration difference falls within a certain value.
- the storage unit 5 automatically stops the stirring unit 51 and the valve to the selective reduction catalyst unit 6 is opened.
- the concentration of ammonia water is made uniform in the pipes leading to the mixing unit 3 and the storage unit 5. If the concentration difference between the inlet and the outlet of the stockpile unit 5 is already within a certain value, the stirring unit 51 becomes unnecessary.
- the selective reduction catalyst unit 6 is a structure having a plurality of through holes extending in one direction to form gas flow paths.
- a catalyst is supported along the inner walls of the structure defining the through holes.
- vanadium, tungsten, and platinum are formed as contained elements.
- the catalyst may be produced by extrusion using titanium oxide as a main component. Nitrogen oxide laden exhaust gas from a marine diesel engine is flowed along the flow path. Nitrogen oxides are removed by supplying ammonia water as a reducing agent from the storage unit 5 at a predetermined flow rate and a predetermined concentration.
- non-toxic urea water is used as the reducing agent for the selective reduction catalyst.
- this embodiment while effectively using LNH3 or the like as part of the fuel of a marine diesel engine, it is possible to divert the existing equipment such as a pump module and a dosing unit for the urea water supply system in the engine. Therefore, there is no need to install a separate supply system for the reducing agent, and an increase in the cost of the apparatus can be suppressed.
- FIG. 2 is an overall view of the selective catalytic reduction system 1 of this embodiment.
- the storage unit 5 of the present embodiment stores ammonia water in advance.
- the concentration of ammonia water pre-stored in the stockpile unit 5 is lower than the concentration desired in the selective reduction catalyst unit 6 .
- LNH3 is mixed while circulating the storage part 5 and the mixing part 3 to increase the concentration to a desired level.
- Ammonia water having a desired concentration is then supplied to the selective reduction catalyst unit 6 .
- the ammonia water can be adjusted to a desired concentration.
- the stirring section 51 of the first embodiment can be omitted.
- the mixing unit 3 of the present embodiment mixes the ammonia water circulated from the storage unit 5 with LNH3. It is preferable that a flow rate adjusting section 4 is provided before the mixing section 3 . By introducing ammonia water and LNH3 into the mixing unit 3 at a predetermined flow rate, ammonia water having a predetermined concentration can be easily produced.
- the heat of chemical reaction in the mixing section 3 may not be used.
- the heat of chemical reaction between aqueous ammonia and LNH3 is smaller than the heat of chemical reaction between LNH3 and fresh water.
- the aqueous ammonia is introduced into the storage unit 5 little by little, local temperature rise in the mixing unit 3 can be suppressed. Therefore, in this embodiment, installation of a heat exchanger or the like becomes unnecessary. As a result, it is possible to save space in the ship.
- the fresh water produced in the distillation section 2 serves as a solvent for the aqueous ammonia previously stored in the storage section 5 . This makes the system highly environmentally friendly.
- a heat exchanger (not shown) may be installed in the mixing section 3 as in the first embodiment.
- the dashed line in FIG. 2 represents the flow of reaction heat through the heat exchanger.
- the fresh water produced by the distillation section 2 should be the solvent for the aqueous ammonia. Therefore, fresh water may be introduced directly into the reservoir 5, as shown in FIG.
- the mixing unit 3 is not provided with the flow rate adjusting unit 4, and an excessively high concentration of ammonia water may be introduced into the storage unit 5.
- the ammonia water circulation system alone is an irreversible system in which the concentration of ammonia water may increase but cannot be reduced. Therefore, by introducing fresh water directly into the storage unit 5, the concentration of ammonia water can be lowered.
- the agitating section 51 is installed in the lower portion of the storage section 5 .
- the storage section 5 if the fresh water produced in the distillation section 2 is not directly introduced into the storage section 5, it does not matter whether the storage section 5 has a stirring function. In this case, the storage section 5 and the mixing section 3 form a circulation line. At this time, even if the ammonia gas partially volatilizes due to the temperature gradient of the outer wall of the storage unit 5, the opportunity for the ammonia water to come into contact with each other is ensured in the circulation line, and the concentration of the ammonia water becomes uniform. .
- the storage unit 5 may store urea water as a reducing agent in advance.
- the aqueous ammonia generated in the mixing unit 3 may be introduced into the storage unit 5 and internally stirred by the stirring unit 51 .
- Urea water and ammonia water have substantially the same effect as reducing agents.
- ammonia has a smaller molecular weight. Therefore, the tank of the storage unit 5 becomes lighter, and the existing tank using urea water as a reducing agent can be set up smaller. In that case, the space in the entire selective reduction catalyst system can be efficiently used.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biomedical Technology (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
一方、舶用ディーゼルエンジンでは、重油に代表される原料の燃焼により発生する窒素酸化物を除去するために、選択式還元触媒ユニットが用いられる。還元剤として、一般的に安全性の高いとされる尿素水が広く用いられている。
アンモニアを燃料の一部とする舶用ディーゼルエンジンに接続される選択式還元触媒システムであって、
海水から清水を蒸留する蒸留部と、
前記蒸留部で蒸留された前記清水と、液化アンモニアとを混合して、アンモニア水を生成する混合部と、
前記混合部で生成された前記アンモニア水を備蓄する備蓄部と、
を有する、選択式還元触媒システムである。
アンモニアを燃料の一部とする舶用ディーゼルエンジンに接続される選択式還元触媒システムであって、
あらかじめアンモニア水を備蓄する備蓄部と、
前記備蓄部にあらかじめ備蓄された前記アンモニア水を、循環させながら、前記アンモニア水と液化アンモニアを混合する混合部と、
を有し、
前記備蓄部は、前記混合部により混合されたアンモニア水を、備蓄する、
選択式還元触媒システムである。
アンモニアを燃料の一部とする舶用ディーゼルエンジンに接続される選択式還元触媒システムにおける還元剤備蓄方法であって、
海水から清水を蒸留し、
蒸留された前記清水と、液化アンモニアとを混合して、アンモニア水を生成し、
生成された前記アンモニア水を備蓄する、
還元剤備蓄方法である。
アンモニアを燃料の一部とする舶用ディーゼルエンジンに接続される選択式還元触媒システムにおける還元剤備蓄方法であって、
前記選択式還元触媒システムで所望される濃度よりも低いアンモニア水をあらかじめ備蓄し、
あらかじめ備蓄された前記アンモニア水を循環させながら、前記アンモニア水と液化アンモニアを混合し、
混合された前記アンモニア水を再び備蓄する、
還元剤備蓄方法である。
まず、第1実施形態の選択式還元触媒システム1の構成について説明する。
図1は、本実施形態の選択式還元触媒システム1の全体図である。図1に記載のLNH3は、アンモニアを燃料の一部とする舶用ディーゼルエンジンの燃料タンクから直接、または、燃料タンクから気化したアンモニアガスを再液化したものである。なお、環境調和性の向上を図るため、LNH3は、アンモニアを燃料の一部とする舶用ディーゼルエンジン自体から出た廃液を回収し、そこから分離して得られたものでもよい。
なお、反応熱を利用するため、混合部3自体をチューブラーリアクターといった熱交換器型反応器としてもよい。
流量調整部4は、備蓄部5に蓄えられるアンモニア水が所定の濃度となるように、混合部3の入口に設置されることが好ましい。特に、LNH3は気化しやすく、制御が必要である。流量調整部4により、所定の濃度のアンモニア水を生成しやすい。また、流量調整部4により、後述する撹拌部51での動作を省略できる。
第1濃度計が設けられる。備蓄部5の流出口に第2濃度計が設けられる。
なお、濃度計よりも計測が容易な密度計が設置されてもよい。その場合、密度計の計測値と濃度との関係を予め取得しておくことが必要となる。例えば、光計測での密度計で0.912という数値になっている場合、アンモニア水濃度は、常温常圧で約15%程度となる。アンモニア水濃度は、飽和状態で最大で40%程度であり、選択式還元触媒ユニット6に供給されるアンモニア水の濃度は高いほど好ましい。
以下、第2実施形態について説明する。なお、第1実施形態と略同様の機能や構成については、その説明を省略する。
図2は、本実施形態の選択式還元触媒システム1の全体図である。第1実施形態と異なり、本実施形態の備蓄部5には、あらかじめアンモニア水が備蓄されている。備蓄部5にあらかじめ備蓄されているアンモニア水の濃度は、選択式還元触媒ユニット6にて所望される濃度よりも低い。備蓄部5と混合部3を循環させながら、LNH3を混合し、所望の濃度まで上昇させる。その後、所望の濃度のアンモニア水が、選択式還元触媒ユニット6に供給される。アンモニア水を循環することにより、アンモニア水が所望の濃度に調整できる。また、アンモニア水を循環することで攪拌され、濃度の斑がない状態にできる。そのため、本実施形態では、第1実施形態の撹拌部51を省略できる。
混合部3の手前に流量調整部4が設けられることが好ましい。アンモニア水とLNH3が所定の流量で混合部3に導入されることで、所定の濃度のアンモニア水が作成しやすくなる。
なお、第1実施形態と同様、混合部3に熱交換器(不図示)が設置されてもよい。図2の破線は、熱交換器による反応熱の流れを表したものである。
第1実施形態又は第2実施形態において、備蓄部5は、還元剤としての尿素水を予め備蓄していてもよい。このとき、混合部3にて生成されたアンモニア水が備蓄部5に導入され、撹拌部51により内部で撹拌されてもよい。還元剤としての効果は、尿素水とアンモニア水でほぼ同じである。この場合、既存の尿素水供給系のポンプモジュール等の設備を流用しつつ、排出される二酸化炭素を削減できる。
また、尿素と比較して、アンモニアは分子量が小さい。そのため、備蓄部5のタンクが軽くなり、尿素水を還元剤とした既存のタンクをより小さく設営しうる。その場合、選択式還元触媒システム全体における空間を効率的に利用できる。
2 蒸留部
3 混合部
4 流量調整部
5 備蓄部
51 撹拌部
6 選択式還元触媒ユニット
Claims (17)
- アンモニアを燃料の一部とする舶用ディーゼルエンジンに接続される選択式還元触媒システムであって、
海水から清水を蒸留する蒸留部と、
前記蒸留部で蒸留された前記清水と、液化アンモニアとを混合して、アンモニア水を生成する混合部と、
前記混合部で生成された前記アンモニア水を備蓄する備蓄部と、
を有する、選択式還元触媒システム。 - 前記混合部にて発生する熱を前記蒸留部で利用する熱交換器を更に有する、
請求項1に記載の選択式還元触媒システム。 - 前記混合部に配置され、前記混合部に導入される前記清水と前記液化アンモニアの流量を調整する流量調整部を更に有する、
請求項1又は2に記載の選択式還元触媒システム。 - アンモニアを燃料の一部とする舶用ディーゼルエンジンに接続される選択式還元触媒システムであって、
あらかじめアンモニア水を備蓄する備蓄部と、
前記備蓄部にあらかじめ備蓄された前記アンモニア水を、循環させながら、前記アンモニア水と液化アンモニアを混合する混合部と、
を有し、
前記備蓄部は、前記混合部により混合されたアンモニア水を、備蓄する、
選択式還元触媒システム。 - 前記混合部に配置され、前記混合部に導入される前記アンモニア水と前記液化アンモニアの流量を調整する流量調整部を更に有する、
請求項4に記載の選択式還元触媒システム。 - 前記備蓄部は、内部を撹拌する撹拌部を有する、
請求項1~5のいずれかに記載の選択式還元触媒システム。 - 前記備蓄部は、
流入口と、
流出口と、
前記流入口に設けられる第1濃度計と、
前記流出口に設けられる第2濃度計と、を有し、
前記備蓄部は、前記第1濃度計と前記第2濃度計の濃度差が所定の値を超えた場合、前記撹拌部を作動させる、
請求項6に記載の選択式還元触媒システム。 - 前記備蓄部は、前記流出口から流出される前記アンモニア水の流量を調整する弁を更に有し、
前記備蓄部は、前記第1濃度計と前記第2濃度計の濃度差が所定の値を超えた場合、前記弁を閉じる、
請求項7に記載の選択式還元触媒システム。 - アンモニアを燃料の一部とする舶用ディーゼルエンジンに接続される選択式還元触媒システムにおける還元剤備蓄方法であって、
海水から清水を蒸留し、
蒸留された前記清水と、液化アンモニアとを混合して、アンモニア水を生成し、
生成された前記アンモニア水を備蓄する、
還元剤備蓄方法。 - 更に、前記アンモニア水を生成する際に発生する熱を利用して、前記海水から前記清水を蒸留する、
請求項9に記載の還元剤備蓄方法。 - 更に、前記アンモニア水を生成するための、蒸留された前記清水と、前記液化アンモニアの流量を所定の混合比に調整する、
請求項9又は10に記載の還元剤備蓄方法。 - 更に、備蓄されたアンモニア水を攪拌する、
請求項9~11のいずれかに記載の還元剤備蓄方法。 - 前記アンモニア水を備蓄する備蓄部の流入口と流出口における前記アンモニア水の濃度差が所定の値を超えた場合に、前記備蓄部に備蓄された前記アンモニア水を攪拌する、
請求項12に記載の還元剤備蓄方法。 - 前記アンモニア水の前記濃度差が所定の値を超えた場合、前記備蓄部の前記流出口からの前記アンモニア水の流出を止める、
請求項13に記載の還元剤備蓄方法。 - 更に、備蓄された前記アンモニア水を前記選択式還元触媒システムにおける還元剤として用いる、
請求項9~14のいずれかに記載の還元剤備蓄方法。 - アンモニアを燃料の一部とする舶用ディーゼルエンジンに接続される選択式還元触媒システムにおける還元剤備蓄方法であって、
前記選択式還元触媒システムで所望される濃度よりも低いアンモニア水をあらかじめ備蓄し、
あらかじめ備蓄された前記アンモニア水を循環させながら、前記アンモニア水と液化アンモニアを混合し、
混合された前記アンモニア水を再び備蓄する、
還元剤備蓄方法。 - 更に、前記アンモニア水を混合するための、あらかじめ備蓄された前記アンモニア水と、前記液化アンモニアの流量を所定の混合比に調整する、
請求項16に記載の還元剤備蓄方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202180096899.XA CN117441057B (zh) | 2021-07-21 | 2021-12-22 | 选择式还原催化剂系统以及还原剂储备方法 |
JP2022500710A JP7128383B1 (ja) | 2021-07-21 | 2021-12-22 | 選択式還元触媒システムおよび還元剤備蓄方法 |
KR1020237035494A KR20230158087A (ko) | 2021-07-21 | 2021-12-22 | 선택식 환원 촉매 시스템 및 환원제 비축 방법 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021120099 | 2021-07-21 | ||
JP2021-120099 | 2021-07-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023002646A1 true WO2023002646A1 (ja) | 2023-01-26 |
Family
ID=84979073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2021/047531 WO2023002646A1 (ja) | 2021-07-21 | 2021-12-22 | 選択式還元触媒システムおよび還元剤備蓄方法 |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2023002646A1 (ja) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11292531A (ja) * | 1998-04-16 | 1999-10-26 | Nkk Sogo Sekkei Kk | 排ガス脱硝用の舶用アンモニア製造装置 |
US8206470B1 (en) * | 2005-08-03 | 2012-06-26 | Jacobson William O | Combustion emission-reducing method |
CN107855003A (zh) * | 2017-11-24 | 2018-03-30 | 江苏科技大学 | 一种基于scr的船舶脱硝系统的氨水回收再利用装置 |
KR102111503B1 (ko) * | 2019-05-14 | 2020-05-15 | 대우조선해양 주식회사 | 친환경 선박의 연료공급시스템 |
KR102231449B1 (ko) * | 2020-06-24 | 2021-03-25 | 대우조선해양 주식회사 | 선박의 온실가스 배출 저감장치 및 이를 구비한 선박 |
KR102232540B1 (ko) * | 2020-10-13 | 2021-03-29 | 대우조선해양 주식회사 | 선박의 온실가스 배출 저감장치 및 이를 구비한 선박 |
-
2021
- 2021-12-22 WO PCT/JP2021/047531 patent/WO2023002646A1/ja active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11292531A (ja) * | 1998-04-16 | 1999-10-26 | Nkk Sogo Sekkei Kk | 排ガス脱硝用の舶用アンモニア製造装置 |
US8206470B1 (en) * | 2005-08-03 | 2012-06-26 | Jacobson William O | Combustion emission-reducing method |
CN107855003A (zh) * | 2017-11-24 | 2018-03-30 | 江苏科技大学 | 一种基于scr的船舶脱硝系统的氨水回收再利用装置 |
KR102111503B1 (ko) * | 2019-05-14 | 2020-05-15 | 대우조선해양 주식회사 | 친환경 선박의 연료공급시스템 |
KR102231449B1 (ko) * | 2020-06-24 | 2021-03-25 | 대우조선해양 주식회사 | 선박의 온실가스 배출 저감장치 및 이를 구비한 선박 |
KR102232540B1 (ko) * | 2020-10-13 | 2021-03-29 | 대우조선해양 주식회사 | 선박의 온실가스 배출 저감장치 및 이를 구비한 선박 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5296735B2 (ja) | NOx低減装置を配備した船舶 | |
FI113463B (fi) | Vesialuksen yhdistetty poistokaasun ja painolastiveden käsittelyjärjestely ja menetelmä vesialuksen painolastiveden käsittelemiseksi | |
KR102558877B1 (ko) | 연소기관의 배기가스 정화설비 | |
US20080314027A1 (en) | Exhaust Gas Treatment | |
KR101933811B1 (ko) | 다중 소스들을 위한 배기 가스 세정기 시스템 | |
JP2010031869A (ja) | 選択触媒還元によるNOx制御のためのガスタービン燃焼排気ガス噴霧冷却 | |
KR960011040B1 (ko) | 질소 산화물 제거방법과 그 실시에 사용하기 위한 장치 | |
JP6940727B1 (ja) | 余剰アンモニアの処理装置および処理方法 | |
WO2023002646A1 (ja) | 選択式還元触媒システムおよび還元剤備蓄方法 | |
JP7128383B1 (ja) | 選択式還元触媒システムおよび還元剤備蓄方法 | |
JP6525990B2 (ja) | 舶用機関の排ガス浄化設備 | |
EP3904649A1 (en) | Reactive cyclic induction system and method for reducing pollutants in marine diesel exhaust | |
KR20200127113A (ko) | 요소수탱크용 온도조절시스템 | |
JP7128382B1 (ja) | 揮発アンモニアガス処理装置および処理方法 | |
WO2023021719A1 (ja) | 揮発アンモニアガス処理装置および処理方法 | |
KR102201255B1 (ko) | 선박의 scr용 요소수용액 제조 시스템 및 방법 | |
WO2022254735A1 (ja) | 余剰アンモニアの処理装置および処理方法 | |
JP2023168655A (ja) | 選択式還元触媒システムおよび還元剤噴霧方法 | |
JPH05269351A (ja) | 窒素酸化物除去方法 | |
KR20210081922A (ko) | 선박의 요소수 생산 시스템 | |
JP2006289326A (ja) | ボイラー廃ガスの脱硝処理方法 | |
US11118492B1 (en) | Reactive cyclic induction system and method for reducing pollutants in marine diesel exhaust | |
KR102291925B1 (ko) | 선박의 scr용 요소수용액 제조 장치 및 방법 | |
JP4250778B2 (ja) | 高温高圧流体冷却方法及び装置 | |
JP6655414B2 (ja) | 排気浄化システム |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2022500710 Country of ref document: JP Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21950995 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202180096899.X Country of ref document: CN |
|
ENP | Entry into the national phase |
Ref document number: 20237035494 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020237035494 Country of ref document: KR |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 21950995 Country of ref document: EP Kind code of ref document: A1 |