WO2022044537A1 - 排ガス浄化装置 - Google Patents

排ガス浄化装置 Download PDF

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Publication number
WO2022044537A1
WO2022044537A1 PCT/JP2021/024749 JP2021024749W WO2022044537A1 WO 2022044537 A1 WO2022044537 A1 WO 2022044537A1 JP 2021024749 W JP2021024749 W JP 2021024749W WO 2022044537 A1 WO2022044537 A1 WO 2022044537A1
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WIPO (PCT)
Prior art keywords
exhaust gas
absorption tower
purification device
gas purification
pipe
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.)
Ceased
Application number
PCT/JP2021/024749
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English (en)
French (fr)
Japanese (ja)
Inventor
広幸 當山
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.)
Fuji Electric Co Ltd
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Fuji Electric 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 Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP2022545491A priority Critical patent/JP7323077B2/ja
Priority to KR1020227025657A priority patent/KR20220112302A/ko
Priority to CN202180011070.5A priority patent/CN115038507A/zh
Publication of WO2022044537A1 publication Critical patent/WO2022044537A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • B01D53/14—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 by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10—Inorganic absorbents
    • B01D2252/103—Water
    • B01D2252/1035—Sea water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides

Definitions

  • the present disclosure relates to an exhaust gas purification device that reduces sulfur oxides contained in exhaust gas generated by combustion of fossil fuels such as coal or heavy oil.
  • An example of an exhaust gas purification device that reduces sulfur oxides contained in exhaust gas generated by combustion of fossil fuels is a device that uses an absorbing liquid containing an alkaline component.
  • Exhaust gas purification devices that use an absorbent liquid are roughly classified into an open loop type and a closed loop type.
  • the open-loop type exhaust gas purification device the absorbed liquid used for absorbing sulfur oxides is stored in a tank or the like and then discarded.
  • the used absorption liquid is stored in a tank or the like and reused as the absorption liquid.
  • Patent Document 1 discloses a closed-loop type exhaust gas purification device.
  • the exhaust gas purification device disclosed in Patent Document 1 has an absorption tower integrated with a chimney. Inside the absorption tower, a spray nozzle that sprays the absorption liquid onto the exhaust gas flowing into the absorption tower is arranged.
  • the inner diameter of the absorption tower may not be sufficiently large, and a sufficient number of spray nozzles may not be provided in the radial direction of the absorption tower. If the inner diameter of the absorption tower cannot be made sufficiently large, a sufficient number of spray nozzles can be secured by providing a plurality of spray nozzles in the height direction of the absorption tower.
  • the exhaust gas rising near the spray nozzles provided in the upper stage is due to the absorption liquid sprayed from the spray nozzles provided in the lower stage. It has undergone absorption of sulfur oxides. For this reason, the concentration of sulfur oxides is reduced in the exhaust gas rising near the spray nozzle provided in the upper stage.
  • the concentration of sulfur oxide is low, the reactivity with the alkaline component decreases, and only a part of the alkaline component contained in the absorption liquid sprayed from the spray nozzle provided in the upper stage is used for the absorption of sulfur oxide. Therefore, there arises a problem that all the alkaline components contained in the absorption liquid cannot be fully utilized.
  • the concentration of the sulfur oxide contained in the exhaust gas is low, there may be a problem that all the alkaline components contained in the absorbing liquid cannot be fully utilized even when the spray nozzle has one stage.
  • the present disclosure has been made in view of the above-mentioned problems, and in an exhaust gas purification device that absorbs sulfur oxides contained in exhaust gas by using an absorbing liquid containing an alkaline component, the alkaline component contained in the absorbing liquid is used.
  • the purpose is to provide technology to improve the utilization efficiency of.
  • the exhaust gas purification device of the present disclosure communicates with an exhaust pipe and has an absorption tower through which exhaust gas generated by combustion of fossil fuel flows in, and an absorption liquid containing an alkaline component for absorbing sulfur oxide.
  • the spray unit that sprays the fuel into the absorption tower, the pump that sends the absorption liquid to the spray unit, and the discharge to collect the droplets accompanying the exhaust gas rising from the absorption tower toward the exhaust stack. It has a collection unit provided in the cylinder, a first end and a second end, the first end is connected to a supply pipe upstream of the suction port of the pump, and the second end is the collection unit.
  • a drain pipe is provided which allows the supply pipe and the collection unit to communicate with each other and drains the droplets collected by the collection unit to the supply pipe as drain water.
  • the exhaust gas purification device of another aspect of the present disclosure communicates with the exhaust stack and absorbs sulfur oxides and an absorption tower through which exhaust gas generated by combustion of fossil fuel flows.
  • One or a plurality of first spraying portions for spraying an absorption liquid containing an alkaline component into the absorption tower, a first pump for delivering the absorption liquid to the one or a plurality of first spray portions, and the exhaust from the absorption tower.
  • a collecting portion provided in the exhaust stack for collecting droplets accompanying the exhaust gas rising toward the cylinder, and the exhaust gas from the source of the exhaust gas to the exhaust stack via the absorption tower.
  • a second spraying unit which is arranged upstream of at least one of the one or a plurality of first spraying units in the flow path and sprays the droplets collected by the collecting unit as drain water. Be prepared.
  • FIG. 1 It is a figure which shows the structural example of the exhaust gas purification apparatus 1A which concerns on 1st Embodiment of this disclosure. It is a figure which shows the structural example of the exhaust gas purification apparatus 1B which concerns on the 2nd Embodiment of this disclosure. It is a figure which shows the structural example of the exhaust gas purification apparatus 1C which concerns on 3rd Embodiment of this disclosure. It is a figure which shows the structural example of the exhaust gas purification apparatus of the modification 1. FIG. It is a figure which shows the other configuration example of the exhaust gas purification apparatus of the modification 1.
  • FIG. 1 is a diagram showing a configuration example of an exhaust gas purification device 1A according to the first embodiment of the present disclosure.
  • the exhaust gas purification device 1A is mounted on a ship 2 that generates propulsive force by burning fossil fuels such as heavy oil or coal.
  • Examples of the engine that generates propulsive force in the ship 2 include an internal combustion engine such as a gasoline engine or a diesel engine, or an external combustion engine including a turbine and a boiler that supplies steam to the turbine.
  • the exhaust gas purification device 1A shown in FIG. 1 is a device that reduces sulfur oxides such as sulfur dioxide contained in exhaust gas generated by combustion of fossil fuels.
  • the exhaust gas whose sulfur oxides have been reduced by the exhaust gas purification device 1A is discharged from the exhaust pipe 3 provided in the chimney (funnel) to the external space, specifically, the atmosphere.
  • the exhaust gas purification device 1A includes an absorption tower 10, a spray unit 20, a supply pipe 30, a water pipe 32, a drain pipe 34 and a drain pipe 36, a tank 40, and a collection unit 50. , A drain pipe 60, a pump 70, and a swirl 80.
  • Exhaust gas generated by burning fossil fuel in the engine of the ship 2 flows into the absorption tower 10 through the exhaust pipe 5.
  • the exhaust pipe 5 is an example of an exhaust pipe that communicates the engine of the ship 2, that is, the source of exhaust gas, with the absorption tower 10.
  • the absorption tower 10 communicates with the exhaust stack 3.
  • the absorption tower 10 may be integrated with the exhaust stack 3.
  • the spray unit 20 includes, for example, a plurality of spray nozzles.
  • the spraying unit 20 sprays the absorbing liquid for absorbing the sulfur oxide contained in the exhaust gas flowing into the absorbing tower 10 into the absorbing tower 10.
  • the ship 2 is a ship navigating in the ocean, and seawater SW is used as an absorbing liquid for absorbing sulfur oxides.
  • the pump 70 sucks the seawater SW around the ship 2 and sends the sucked seawater SW to the spray unit 20.
  • a supply pipe 30 that opens to the bottom of the ship 2 is connected to the suction port of the pump 70.
  • the pump 70 sucks the seawater SW around the ship 2 through the supply pipe 30.
  • One end of the water pipe 32 is connected to the discharge port of the pump 70.
  • the other end of the water pipe 32 is branched into a plurality of branches, each of which is connected to the spray portion 20.
  • the pump 70 sends the seawater SW sucked through the supply pipe 30 to the spray unit 20 via the water pipe 32.
  • the spray unit 20 is provided in three stages in the vertical direction of the absorption tower 10.
  • the inner diameter of the absorption tower 10 cannot be made sufficiently large, and a sufficient number of spray portions 20 may not be provided in the radial direction of the absorption tower 10. .
  • the reason why the spraying portions 20 are provided in three stages in the vertical direction of the absorption tower 10 is that a sufficient number of spraying portions 20 are provided for the entire absorption tower 10 even if the inner diameter of the absorption tower 10 cannot be sufficiently obtained. Is.
  • the number of steps in the vertical direction of the spray portion 20 may be one or two. If it is necessary to further reduce the inner diameter of the absorption tower 10, the number of steps in the spray section 20 in the vertical direction may be four or more.
  • the absorption liquid sprayed into the absorption tower 10 by the spray unit 20 and used for absorbing sulfur dioxide contained in the exhaust gas is drained from the absorption tower 10 to the tank 40 via the drain pipe 34.
  • the liquid drained from the absorption tower 10 via the drain pipe 34 may be referred to as a waste liquid.
  • sulfur oxides in the exhaust gas are absorbed by utilizing the alkaline component (HCO 3- ) contained in the seawater SW. More specifically, when the absorption liquid sprayed by the spray unit 20 comes into contact with the exhaust gas, the sulfur oxides contained in the exhaust gas are absorbed into the absorption liquid. Sulfurous acid ion (HSO 3- ) is generated in the absorption liquid in the process of absorbing sulfur oxides.
  • the absorbed liquid used for absorbing sulfur oxides is oxidized by contact with a large amount of air in the tank 40, and the sulfite ion in the used absorbed liquid is detoxified as sulfate ion (SO 4-2 ) . ..
  • the used absorption liquid that has undergone the oxidation treatment is released into the ocean after adjusting the pH and recovering the dissolved oxygen by neutralization and aeration treatment in the tank 40.
  • the chemical reactions of the absorption, oxidation, and neutralization treatments in the exhaust gas purification device 1A are as follows. Absorption : SO 2 + H 2 O ⁇ H + + HSO 3- Oxidation : HSO 3- + (1/2) O 2 ⁇ H + + SO 4 2- Neutralization : HCO 3- + H + ⁇ H 2 O + CO 2 ⁇
  • the tank 40 is, for example, a gas seal chamber.
  • the waste liquid drained from the drain pipe 34 is stored together with the air.
  • a drainage pipe 36 that opens to the bottom of the ship 2 projects into the internal space of the tank 40.
  • the waste liquid stored in the tank 40 is discharged to the ocean through the drain pipe 36 after being inspected for pH and dissolved oxygen amount by the water treatment system 4.
  • the exhaust gas purification device 1A of the present embodiment is an open-loop type exhaust gas purification device that disposes of the used absorption liquid for absorbing sulfur oxides contained in the exhaust gas without reusing it.
  • the sea navigating by the ship 2 equipped with the exhaust gas purification device 1A serves as an external water source for the absorbing liquid.
  • a valve that opens and closes under the control of the water treatment system 4 is provided at the upper end of the drainage pipe 36.
  • the water treatment system 4 opens the valve at the upper end of the drain pipe 36 when the pH of the liquid stored in the tank 40 and the amount of dissolved oxygen satisfy a predetermined reference value.
  • the valve at the upper end of the drain pipe 36 is open, the liquid exceeding the height of the drain pipe 36 protruding into the internal space of the tank 40 is discharged to the ocean outside the ship 2 through the drain pipe 36. ..
  • the pH and the amount of dissolved oxygen have predetermined reference values, which are determined according to the sea area in which the ship 2 is navigating.
  • the exhaust gas flowing into the absorption tower 10 comes into contact with the absorption liquid sprayed by the spray unit 20, absorbs and removes at least a part of the sulfur oxide contained therein, and then rises toward the exhaust stack 3.
  • the exhaust gas in which at least a part of the sulfur oxide is absorbed is referred to as a treated exhaust gas.
  • the swirl 80 is a guide blade that applies centrifugal force to the treated exhaust gas rising from the absorption tower 10 toward the exhaust stack 3.
  • the swirl 80 is provided at the boundary between the absorption tower 10 and the exhaust stack 3. That is, in the present embodiment, the portion below the swirl 80 is the absorption tower 10, and the portion above the swirl 80 is the exhaust stack 3.
  • the treated exhaust gas is given centrifugal force by rising along the swirl 80, and rises along the inner surface of the exhaust stack 3.
  • the treated exhaust gas rising along the inner surface of the exhaust stack 3 may be accompanied by droplets of an unused absorption liquid or a used absorption liquid. ..
  • the collecting unit 50 is for separating the droplets from the treated exhaust gas accompanying the droplets. As shown in FIG. 1, in the present embodiment, the collecting portion 50 is provided at the upper end portion of the exhaust stack 3, but may be provided at a position below the upper end portion of the exhaust stack 3 and above the swirl 80.
  • the collecting unit 50 has an opening that opens on the inner surface of the exhaust gas cylinder 3, and collects droplets that rise along the inner surface of the exhaust gas cylinder 3 together with the treated exhaust gas through the opening portion.
  • the drain pipe 60 has a first end connected to the supply pipe 30 and a second end connected to the collection unit 50. As shown in FIG. 1, the supply pipe 30 upstream of the suction port of the pump 70 and the collection unit 50 communicate with each other via the drain pipe 60. The drain pipe 60 drains the droplets collected by the collecting unit 50 to the supply pipe 30 as drain water. The drain water drained from the drain pipe 60 is sent out to the spray unit 20 via the water supply pipe 32 together with the seawater sucked up by the pump 70 through the supply pipe 30, and is used again as an absorbing liquid.
  • the inner diameter of the supply pipe 30 is constant, but the inner diameter of the portion to which the drain pipe 60 is connected may be smaller than the inner diameter of the other portion.
  • the seawater in the vicinity of the opening of the drain pipe 60 becomes a high-speed low-pressure fluid, and the supply pipe is supplied from the drain pipe 60. It becomes possible to efficiently draw the drain water into 30, and it is possible to improve the mixing property of the drawn drain water and the seawater.
  • the drain water is used again as an absorbing liquid.
  • the drain water may contain an unused absorbing liquid, and the unused alkaline component contained in the drain water is reused for absorbing the sulfur oxide contained in the exhaust gas.
  • the utilization efficiency of the alkaline component contained in the absorption liquid is improved.
  • FIG. 2 is a diagram showing a configuration example of the exhaust gas purification device 1B according to the second embodiment of the present disclosure.
  • the exhaust gas purification device 1B of the present embodiment is an open-loop type exhaust gas purification device like the exhaust gas purification device 1A.
  • FIG. 2 the same components as those in FIG. 1 are designated by the same reference numerals as those in FIG.
  • the first difference is that it has a degassing mechanism 90, a tank 100, a pump 110, and a spray unit 120.
  • the second difference is that the collection unit 50 and the tank 100 communicate with each other via the drain pipe 60.
  • the degassing mechanism 90 is provided in the upper part of the drain pipe 60, that is, in the vicinity of the connection portion between the drain pipe 60 and the collecting portion 50.
  • the degassing mechanism 90 communicates the drain pipe 60 with the external space. Since a gas venting mechanism 90 for communicating the drain pipe 60 to the external space is provided near the connection portion between the drain pipe 60 and the collecting portion 50, in the exhaust gas purification device 1B, the gas venting mechanism is provided from the inlet portion of the drain pipe 60. A flow of exhaust gas toward 90 is generated, and the collection of droplets by the collection unit 50 can be promoted.
  • the exhaust gas purifying device 1B of the present embodiment it becomes possible to efficiently collect the droplets by the collecting unit 50 as compared with the exhaust gas purifying device 1A of the first embodiment.
  • the exhaust gas purifying device 1A may be provided with the degassing mechanism 90.
  • Drain water drained from the drain pipe 60 is stored in the tank 100.
  • the pump 110 sucks out the drain water stored in the tank 100 and sends it out to the spray unit 120.
  • the pump 110 in the exhaust gas purification device 1B is an example of the second pump in the present disclosure
  • the pump 70 is an example of the first pump in the present disclosure.
  • the spray unit 120 sprays the drain water sent out from the pump 110 into the absorption tower 10 as an absorption liquid for absorbing sulfur oxides.
  • the spray unit 120 is an example of the second spray unit in the present disclosure
  • the spray unit 20 is an example of the first spray unit in the present disclosure.
  • the exhaust gas purification device 1B has three spray units 20 and one spray unit 120. Then, the spray unit 120 is located on the upstream side of the middle and upper spray units 20 in the flow path of the exhaust gas from the exhaust gas source to the exhaust pipe 3 via the absorption tower 10, that is, on the side closer to the exhaust gas source. It will be provided.
  • the exhaust gas rising in the vicinity of the spraying portion 120 passes through the absorption of sulfur oxides by the absorbing liquid sprayed by the lower spraying portion 20. For this reason, the sulfur oxides contained in the exhaust gas rising near the spray unit 120 are reduced by the amount absorbed by the absorption liquid sprayed by the lower spray unit 20, but in the first embodiment, the upper spray is used.
  • the exhaust gas containing more sulfur oxides than the exhaust gas rising near the spray portion 20 in the upper stage is sprayed with the drain water as an absorbing liquid by the spray portion 120, so that the drain water remains in the drain water.
  • Alkaline components can be effectively used.
  • the utilization efficiency of the alkaline component contained in the absorbing liquid is improved in the exhaust gas purification device that absorbs the sulfur oxide contained in the exhaust gas by using the absorbing liquid containing the alkaline component.
  • the exhaust gas purifying device 1B of the present embodiment has a degassing mechanism 90 above the drain pipe 60, but the degassing mechanism 90 may be omitted. This is because even if the degassing mechanism 90 is omitted, the efficiency of utilizing the alkaline component contained in the absorbing liquid is still improved.
  • FIG. 3 is a diagram showing a configuration example of the exhaust gas purification device 1C according to the third embodiment of the present disclosure.
  • the exhaust gas purification device 1C of the present embodiment is also an open-loop type exhaust gas purification device like the exhaust gas purification device 1B.
  • the same components as those in FIG. 2 are designated by the same reference numerals as those in FIG.
  • the difference in the configuration between the exhaust gas purification device 1C and the exhaust gas purification device 1B is that the spray portion 120 is in the path of the exhaust gas from the absorption tower 10 to the exhaust pipe 3. However, it is provided on the upstream side of the three spraying portions 20, specifically, in the exhaust pipe 5 that communicates the exhaust gas generation source and the absorption tower 10.
  • the exhaust gas arriving near the spray unit 120 in the exhaust gas purification device 1C contains high-concentration sulfur oxides because the absorption liquid sprayed by the spray unit 20 does not absorb the sulfur oxides.
  • the alkaline component remaining in the drain water can be effectively used.
  • the exhaust gas purification device that absorbs sulfur oxides contained in the exhaust gas by using the absorbing liquid containing the alkaline component the utilization efficiency of the alkaline component contained in the absorbing liquid is improved.
  • the degassing mechanism 90 can be omitted in this embodiment as well.
  • the exhaust gas purification device 1A in the first embodiment is an open-loop type exhaust gas purification device that takes in the seawater SW that plays the role of an absorption liquid from the periphery of the ship 2 and discharges the used absorption liquid to the outside of the ship 2. .
  • the technical features of the first embodiment may be adopted for a closed-loop type exhaust gas purifying device having a collecting portion and a drain pipe.
  • the technical features of the second or third embodiment may be adopted in a closed-loop type exhaust gas purification device having a collecting portion and a drain pipe. This is because even in the closed-loop type exhaust gas purification device, it may not be possible to use up the alkaline component contained in the absorbing liquid.
  • FIG. 4 is a diagram showing an example of adoption of the technical features of the first embodiment in a closed-loop type exhaust gas purification device having a collecting portion and a drain pipe.
  • the exhaust gas purification device 1D a certain amount of absorbing liquid is stored in the tank 40 in advance.
  • the supply pipe 30 is connected to the tank 40.
  • the pump 70 sucks the absorbing liquid stored in the tank 40 through the supply pipe 30 and sends it out to the spraying unit 20 via the water pipe 32.
  • the exhaust gas purification device 1D shown in FIG. 5 is not provided with the drain pipe 36, and the used absorption liquid returned to the tank 40 is reused as the absorption liquid after being neutralized and aerated.
  • the drain water is a tank as in the exhaust gas purification device 1A of the first embodiment. It is used to absorb sulfur oxides together with the water absorbing liquid drawn from 40. Therefore, the alkaline component remaining in the drain water can be used for absorption of sulfur oxides.
  • FIG. 5 is a diagram showing an example of adoption of the technical features of the first embodiment in the exhaust gas purification device of the hybrid system.
  • the exhaust gas purification device 1E shown in FIG. 5 includes a supply pipe 30a, a supply pipe 30b, a supply pipe 30c, and a switching valve 38.
  • the supply pipe 30a opens at the bottom of the ship 2.
  • the supply pipe 30b is connected to the tank 40.
  • Each of the supply pipe 30a and the supply pipe 30b is connected to the supply pipe 30c via the switching valve 38.
  • the supply pipe 30c is connected to the suction port of the pump 70, and the drain pipe 60 is connected to the supply pipe 30c.
  • the switching valve 38 is a three-way valve.
  • the exhaust gas purification device 1E by switching the switching valve 38, either one of the supply pipe 30a and the supply pipe 30b communicates with the suction port of the pump 70 via the supply pipe 30c.
  • the exhaust gas purification device 1E functions as an open-loop type exhaust gas purification device.
  • the exhaust gas purification device 1E functions as a closed-loop type exhaust gas purification device.
  • the exhaust gas can be purified by the open loop type in the sea area where the drainage regulation to the ocean is loose, while the exhaust gas can be purified by the closed loop type in the sea area where the drainage regulation is strict.
  • the open ocean is an example of a sea area where drainage regulations are loose.
  • a coastal sea area is an example of a sea area where drainage regulations are strict.
  • the exhaust gas purification device 1E shown in FIG. 5 may be modified to have a configuration in which the supply pipe 30b is connected to the supply pipe 30a via a switching valve. This configuration may be modified to a configuration in which a second pump separate from the pump 70 is further provided, and seawater sucked by the second pump is injected into the tank 40 via the supply pipe 30b.
  • a configuration in which the supply pipe 30b is connected to the water supply pipe 32 is also conceivable, but in the configuration in which the supply pipe 30b is connected to the water supply pipe 32, a pump for delivering the absorption liquid from the supply pipe 30b to the water supply pipe 32 is provided in the supply pipe 30b. Is required.
  • the ship 2 in each of the above embodiments is a ship navigating in the ocean, but may be a vessel navigating in a freshwater area.
  • sodium hydroxide, magnesium hydroxide, or the like may be added to the water sucked from the periphery of the ship 2 to replenish the alkaline component.
  • the absorption liquid in the present disclosure is not limited to seawater, and may be an alkaline aqueous solution containing an alkaline component.
  • the alkaline component is not limited to HCO 3- .
  • the tank 100 and the pump 110 are provided at the same height, but the tank 100 may be provided at a position higher than the pump 110. This is to reduce the load on the pump 110 when the drain water is sucked out from the tank 100.
  • the drain water collected by the collecting unit 50 is stored in the tank 100, and the drain water stored in the tank 100 is sucked out by the pump 110 and sent out to the spraying unit 120. ..
  • the tank 100 and the pump 110 may be omitted, and the collection unit 50 and the spray unit 120 may be communicated with each other via the drain pipe 60. In short, the drain water collected by the collecting unit 50 may be sprayed onto the spraying unit 120.
  • One aspect of the exhaust gas purification apparatus of the present disclosure includes an absorption tower, a spray section, a pump, a collection section, and a drain pipe.
  • Exhaust gas generated by the combustion of fossil fuels flows into the absorption tower.
  • the absorption tower communicates with the exhaust pipe that discharges the exhaust gas with reduced sulfur oxides to the external space.
  • the spraying unit sprays an absorbing liquid containing an alkaline component for absorbing sulfur oxides into the absorption tower.
  • the pump sends the absorbing liquid to the spraying part.
  • the collecting unit is provided in the exhaust stack to collect the droplets accompanying the exhaust gas rising from the absorption tower toward the exhaust stack.
  • the drain pipe communicates the supply pipe upstream of the suction port of the pump with the collection part.
  • the drain pipe uses the droplets collected by the collection unit as drain water and drains them to the supply pipe upstream of the suction port of the pump. According to the exhaust gas purification device of this embodiment, the utilization efficiency of the alkaline component contained in the absorbing liquid is improved.
  • the inner diameter of the portion of the supply pipe upstream of the suction port of the pump to which the drain pipe is connected may be smaller than the inner diameter of the other portion of the supply pipe. According to the exhaust gas purification device of this embodiment, the drain water can be efficiently drawn into the supply pipe, and the mixing property of the drawn drain water and the absorbing liquid can be improved.
  • a more preferable embodiment of the exhaust gas purification device includes a first drainage pipe, a tank, and a second drainage pipe.
  • the first drain pipe drains the absorption liquid sprayed into the absorption tower by the spray unit from the absorption tower.
  • the drainage pipe 34 in the first embodiment is an example of the first drainage pipe.
  • the tank stores the absorbing liquid drained from the first drain pipe.
  • the tank corresponds to the tank 40 in each of the above embodiments.
  • the second drain pipe drains the absorbed liquid stored in the tank to an external water source.
  • the drainage pipe 36 in the first embodiment is an example of the second drainage pipe.
  • the exhaust gas purification device of this embodiment water sucked from an external water source by a pump is used as the absorption liquid, and the used absorption liquid is stored in the tank and then drained through the second drain pipe. That is, the exhaust gas purification device of this embodiment is an open loop type. As described above, according to this aspect, in the open loop type exhaust gas purification device that absorbs the sulfur oxide contained in the exhaust gas by using the absorbing liquid containing the alkaline component, the utilization efficiency of the alkaline component contained in the absorbing liquid is improved. do.
  • the exhaust gas purification device includes a drain pipe for draining the absorption liquid sprayed into the absorption tower by the spray unit from the absorption tower, and a tank for storing the absorption liquid drained from the drain pipe.
  • the pump sucks the absorbed liquid stored in the tank and sends it out to the spraying part.
  • the exhaust gas purification device of this embodiment is a closed loop type.
  • the closed-loop type exhaust gas purification device that absorbs sulfur oxides contained in the exhaust gas by using the absorbing liquid containing the alkaline component, the utilization efficiency of the alkaline component contained in the absorbing liquid is improved. do.
  • the exhaust gas purification device of another aspect of the present disclosure includes an absorption tower, one or more first spraying parts, a first pump, a collecting part, and a second spraying part.
  • Exhaust gas generated by the combustion of fossil fuels flows into the absorption tower.
  • the absorption tower communicates with the exhaust pipe that discharges the exhaust gas with reduced sulfur oxides to the external space.
  • One or a plurality of first spray units spray an absorption liquid containing an alkaline component for absorbing sulfur oxides into the absorption tower.
  • the first pump sends the absorption liquid to the one or a plurality of first spraying portions.
  • the collecting unit is provided in the exhaust stack in order to collect droplets accompanying the exhaust gas rising from the absorption tower toward the exhaust stack.
  • the second spray unit is located upstream of at least one of the one or a plurality of first spray units in the flow path of the exhaust gas from the source of the exhaust gas to the exhaust stack via the absorption tower. Be placed.
  • the second spraying unit sprays the droplets collected by the collecting unit as drain water.
  • the alkaline component remaining in the drain water can be effectively used, so that the utilization efficiency of the alkaline component is improved.
  • the exhaust gas purification device includes a drain pipe for draining the drain water, a tank for storing the drain water drained from the drain pipe, and the drain water stored in the tank to the two spraying portions.
  • a second pump to deliver may be provided.
  • the second spray unit may be arranged inside the absorption tower.
  • the exhaust gas purifying device of another preferred embodiment includes an exhaust pipe that communicates the exhaust gas source and the absorption tower, and the second spraying portion may be installed in the exhaust pipe.
  • Exhaust gas purification device 2 ... Ship, 3 ... Exhaust pipe, 4 ... Water treatment system, 5 ... Exhaust pipe, 10 ... Absorption tower, 20, 120 ... Spray part, 30 ... Supply pipe, 32 ... Water pipe, 34, 36 ... Drain pipe, 40, 100 ... Tank, 50 ... Collection part, 60 ... Drain pipe, 70, 110 ... Pump, 80 ... Swala, 90 ... Degassing mechanism.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Combustion & Propulsion (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)
PCT/JP2021/024749 2020-08-24 2021-06-30 排ガス浄化装置 Ceased WO2022044537A1 (ja)

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KR1020227025657A KR20220112302A (ko) 2020-08-24 2021-06-30 배기가스 정화 장치
CN202180011070.5A CN115038507A (zh) 2020-08-24 2021-06-30 排气净化装置

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WO1994023826A1 (fr) * 1993-04-09 1994-10-27 Babcock-Hitachi Kabushiki Kaisha Dispositif de desulfuration a voie humide d'effluents gazeux
JPH11128671A (ja) * 1997-11-05 1999-05-18 Mitsubishi Heavy Ind Ltd 湿式排煙脱硫装置
JPH11151426A (ja) * 1997-11-19 1999-06-08 Ishikawajima Harima Heavy Ind Co Ltd 煙突一体型排煙脱硫装置
WO2014098081A1 (ja) * 2012-12-19 2014-06-26 富士電機株式会社 排ガス処理装置

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TR199901599T1 (xx) * 1997-11-11 2000-02-21 Mitsubishi Heavy Industies, Ltd Islak gaz işleme yöntemi ve bu yöntemi kullanan aygıt.
FR2894156B1 (fr) * 2005-12-02 2008-02-22 Otv Sa Dispositif de traitement d'un effluent gazeux charge en composes odorants a l'aide d'un maillage tridimensionnel, installation et procede correspondants
CN107321155A (zh) * 2017-06-21 2017-11-07 宜昌聚龙环保科技有限公司 一种用于氮氧化物的吸收装置
CN206996233U (zh) * 2017-07-07 2018-02-13 金川集团股份有限公司 一种塔囱一体的烟气处理装置
CN108722163B (zh) * 2017-09-07 2019-06-07 江苏新世纪江南环保股份有限公司 一种氨法脱硫控制吸收过程气溶胶产生的方法
CN210814668U (zh) * 2019-09-11 2020-06-23 宜昌汇富硅材料有限公司 一种气相法白炭黑生产装置的尾气处理系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994023826A1 (fr) * 1993-04-09 1994-10-27 Babcock-Hitachi Kabushiki Kaisha Dispositif de desulfuration a voie humide d'effluents gazeux
JPH11128671A (ja) * 1997-11-05 1999-05-18 Mitsubishi Heavy Ind Ltd 湿式排煙脱硫装置
JPH11151426A (ja) * 1997-11-19 1999-06-08 Ishikawajima Harima Heavy Ind Co Ltd 煙突一体型排煙脱硫装置
WO2014098081A1 (ja) * 2012-12-19 2014-06-26 富士電機株式会社 排ガス処理装置

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JP7323077B2 (ja) 2023-08-08

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