JP2024011568A - Exhaust gas processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the processing performance.

SOLUTION: An exhaust gas processing device 100 comprises: a cylindrical reaction cylinder 21 in which introduced exhaust gas A advances while revolving; and a jetting unit 30 which jets liquid for processing the exhaust gas A in the reaction cylinder 21. The jetting unit 30 comprises: a trunk pipe 31 which extends onto a central axis C of the reaction cylinder 21 and to which the liquid is supplied; a plurality of branch pipes 32 which extend in the radial direction of the reaction cylinder 21 from the trunk pipe 31; and a spray part 33 which is provided in each of the plurality of branch pipes 32 and sprays the liquid toward the direction of revolving of the exhaust gas A. A position of a peak Qs of the spray amount distribution of the liquid in the radial direction of the spray part 33 corresponds to a position of a peak Vs of the flow rate distribution in the radial direction of the exhaust gas A.

SELECTED DRAWING: Figure 5

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present disclosure relates to an exhaust gas treatment device.

BACKGROUND ART Conventionally, exhaust gas treatment devices are known that remove harmful substances from the exhaust gas by bringing an absorption liquid into gas-liquid contact with exhaust gas containing harmful substances such as sulfur oxides, and allowing the absorption liquid to absorb the harmful substances. Furthermore, among this type of exhaust gas treatment apparatus, a cyclone type apparatus is known. A cyclone-type exhaust gas treatment device is a device that includes a reaction tower having an exhaust gas introduction part and an exhaust part, and in which the exhaust gas travels spirally inside the reaction tower from the introduction part to the discharge part (for example, (See Patent Document 1 and Patent Document 2).

Patent No. 5999226 Patent No. 6747552

In a cyclone-type exhaust gas treatment device, harmful substances in the exhaust gas are absorbed into droplets of the absorption liquid by spraying an absorption liquid onto the exhaust gas spiraling inside a reaction tower. However, in the conventional cyclone type exhaust gas treatment device, the amount of absorption liquid sprayed is insufficient in relation to the flow velocity distribution of the exhaust gas, and there is room for improvement in terms of exhaust gas treatment performance.
In consideration of the above circumstances, the present disclosure aims to improve processing performance.

In order to solve the above problems, an exhaust gas treatment device according to one aspect of the present disclosure includes a cylindrical reaction tube in which introduced exhaust gas moves while rotating, and a liquid that treats the exhaust gas inside the reaction tube. a main pipe extending on the central axis of the reaction cylinder and to which the liquid is supplied; and a plurality of main pipes extending in the radial direction of the reaction cylinder from the main pipe. a branch pipe; and a spraying section that is provided in each of the plurality of branch pipes and sprays the liquid in the direction of swirling of the exhaust gas, and the spray amount distribution of the liquid in the radial direction of the spraying section. The position of the peak corresponds to the position of the peak of the flow velocity distribution of the exhaust gas in the radial direction.

FIG. 1 is a configuration diagram of a ship to which the exhaust gas treatment device of the first embodiment is applied. FIG. 2 is a diagram schematically showing the internal configuration of the exhaust gas treatment device. 3 is a view taken along the line III-III in FIG. 2. FIG. FIG. 2 is an explanatory diagram of the flow velocity distribution of exhaust gas flowing inside the reaction column. FIG. 2 is a diagram showing the relationship among the flow velocity distribution of exhaust gas, the spray amount distribution of absorption liquid, and the residual concentration distribution of harmful substances in the radial direction. It is a figure which shows typically the structure of the spray part of 2nd Embodiment. FIG. 3 is an explanatory diagram of the arrangement of nozzles.

Embodiments for implementing the present disclosure will be described with reference to the drawings. Note that in each drawing, the dimensions and scale of each element may differ from those of the actual product. Moreover, the form described below is one exemplary form assumed when implementing the present disclosure. Therefore, the scope of the present disclosure is not limited to the forms illustrated below.

1. First Embodiment FIG. 1 is a configuration diagram of a ship 200 to which an exhaust gas treatment device 100 of a first embodiment is applied. As shown in FIG. 1, the ship 200 includes a power plant 11, a liquid supply pump 13, and an exhaust gas treatment device 100. Note that in the following description, "upper" means upward in the vertical direction, and "downward" means downward in the vertical direction.

The power plant 11 is, for example, an internal combustion engine such as a gasoline engine or a diesel engine, or an external combustion engine including a boiler and a turbine. The power plant 11 generates propulsive force for the ship 200 by burning fossil fuel such as heavy oil or coal, for example. The power plant 11 discharges exhaust gas A containing harmful substances such as nitrogen oxides or sulfur oxides. Hazardous substances may include dust.
The exhaust gas treatment device 100 is a scrubber that reduces harmful substances in the exhaust gas supplied from the power plant 11 through the exhaust pipe 12. The exhaust gas A after being treated by the exhaust gas treatment device 100 is released into external space (for example, into the atmosphere). In the ship 200, the power plant 11 and the exhaust gas treatment device 100 constitute an exhaust gas treatment system that purifies the exhaust gas A of the power device 11.

The liquid supply pump 13 supplies a liquid that absorbs harmful substances contained in the exhaust gas A (hereinafter referred to as "absorption liquid") to the exhaust gas treatment device 100. Specifically, the liquid supply pump 13 supplies seawater around the ship 200 to the exhaust gas treatment device 100 as an absorption liquid. For example, harmful substances contained in exhaust gas A are absorbed by alkaline components (HCO ₃ ⁻ ) in seawater. The absorption liquid sent out from the liquid supply pump 13 is supplied to the exhaust gas treatment device 100 via the liquid supply pipe 14 .

FIG. 2 is a diagram schematically showing the internal configuration of the exhaust gas treatment device 100. In addition, in FIG. 2, illustration of a spray section 33 and a nozzle 34, which will be described later, is omitted.
As shown in FIG. 2, the exhaust gas treatment device 100 includes an absorption tower 20, an injection section 30, a collection section 40, and a waste liquid storage section 50.
The absorption tower 20 is a cylindrical structure and is installed with the central axis C oriented in the vertical direction. The absorption tower 20 includes a reaction tube 21 provided below, a connecting portion 22 connected to an upper end 21A of the reaction tube 21, and an exhaust tube 23 connected to an upper end 22A of the connecting portion 22. The reaction tube 21, the connecting portion 22, and the exhaust tube 23 are provided coaxially with the central axis C of the absorption tower 20. In the following description, the circumferential direction of a virtual circle having an arbitrary diameter centered on the central axis C will be referred to as a "circumferential direction," and the radial direction of the virtual circle will be referred to as a "radial direction."

The reaction tube 21 is a cylindrical portion and includes an exhaust gas introduction part 210 to which the exhaust pipe 12 is connected. The exhaust gas introduction section 210 is provided at a position close to the lower end 21B of the reaction tube 21. The connecting portion 22 is a truncated conical portion. The inner diameter of the upper end 22A of the connecting portion 22 is smaller than the inner diameter of the lower end 22B. The exhaust pipe 23 is a cylindrical portion having a smaller diameter than the reaction pipe 21. An exhaust port 230 for discharging exhaust gas A is opened at the upper end 23A of the exhaust pipe 23. Note that the reaction tube 21, the connecting portion 22, and the exhaust tube 23 may be configured integrally with each other, or may be configured as separate bodies and connected to each other.

FIG. 3 is a view taken along the line III-III in FIG. 2. Note that FIG. 3 is a schematic diagram, and the dimensions and scale of each element may differ from the actual product.
As shown in FIG. 3, the exhaust gas introduction section 210 includes a through hole 212 formed on the circumferential surface of the reaction tube 21 and an introduction pipe 216 extending outside from the through hole 212. A tube 12 is connected. The introduction tube 216 is joined to the reaction tube 21 so that the longitudinal direction Ea deviates from the central axis C (that is, does not intersect with it). Therefore, the exhaust gas A flowing into the reaction tube 21 from the introduction pipe 216 advances in the circumferential direction of the reaction tube 21 along the inner wall surface 21S of the reaction tube 21, and becomes a swirling flow that swirls around the central axis C. As a result, as shown in FIG. 2, the exhaust gas A spirals from the exhaust gas introduction part 210 at the lower part of the reaction tube 21 toward the upper discharge port 230 while turning around the central axis C. The scrubber in which the exhaust gas A travels in a spiral manner while swirling inside the reaction tube 21 is generally also referred to as a cyclone type scrubber.

The injection unit 30 injects the absorption liquid into the reaction tube 21 . Specifically, as shown in FIG. 2, the injection section 30 includes a main pipe 31, a plurality of branch pipes 32, and a spray section 33 (FIG. 3) provided in each branch pipe 32.
The main pipe 31 is a cylindrical structure installed coaxially with the central axis C of the absorption tower 20, and extends from the lower end 21B, which is one end of the reaction tube 21, toward the upper end 21A, which is the other end. Further, the plurality of branch pipes 32 are tubular members having a smaller diameter than the main pipe 31, and extend in the radial direction from the circumferential surface of the main pipe 31 perpendicularly to the circumferential surface, as shown in FIG. In this embodiment, the tip 32A of each branch pipe 32 is joined to the inner wall surface 21S of the reaction tube 21 by a method such as welding. Note that the tip 32A of the branch pipe 32 may be a free end that is not joined to the inner wall surface 21S and forms a gap with the inner wall surface 21S.
As shown in FIG. 3, the spray section 33 is provided in each of the plurality of branch pipes 32, and sprays (ie, sprays) the absorption liquid in the form of mist. The spraying section 33 includes a plurality of nozzles 34 that spray the absorption liquid.

In the exhaust gas treatment device 100, the absorption liquid sent from the liquid supply pump 13 (FIG. 1) is supplied to the main pipe 31 via the liquid supply pipe 14 (FIG. 1), and from the main pipe 31 to the plurality of branch pipes 32. and is sprayed from each nozzle 34 of the spray section 33. The exhaust gas A and the absorption liquid come into gas-liquid contact with each other due to the spraying of the absorption liquid, and the harmful substances contained in the exhaust gas A are absorbed into the droplets of the absorption liquid. Further, in each branch pipe 32, the spray section 33 sprays the absorption liquid in the direction of the swirling flow of the exhaust gas A. As a result, the spray of the absorption liquid is prevented from interfering with the swirling flow of the exhaust gas A.

Most of the absorption liquid sprayed from the spraying section 33 is recovered by adhering to the inner wall surface 21S of the reaction tube 21 and forming a liquid film as the exhaust gas A moves spirally through the reaction tube 21. On the other hand, a part of the absorption liquid reaches the exhaust pipe 23 together with the exhaust gas A. As shown in FIG. 2, the collection unit 40 includes a collection device that is disposed inside the exhaust pipe 23 and collects the absorption liquid that has reached the exhaust pipe 23. For example, a demister or a swirler is used as the collection device. Since the collection unit 40 collects the absorption liquid, the absorption liquid is prevented from being discharged to the outside from the discharge port 230. Further, it is possible to prevent a situation in which the absorbent liquid released to the outside falls onto the ground (in this description, the deck of the ship 200).

The waste liquid storage section 50 stores the absorption liquid collected by the inner wall surface 21S of the reaction tube 21 and the collection section 40. Specifically, as shown in FIG. 2, the waste liquid storage section 50 includes a storage tank 500 that stores the collected absorption liquid. The storage tank 500 is arranged at a position lower than the reaction tube 21 in the vertical direction, and is connected to a drain pipe 502 extending from the bottom of the reaction tube 21. The absorption liquid collected by the reaction tube 21 and the collecting section 40 is led to the storage tank 500 through the drain pipe 502 and stored in the storage tank 500. Storage tank 500 is, for example, a gas-sealed chamber. A drain pipe 503 is connected to the storage tank 500, and the absorbent liquid stored in the storage tank 500 is drained to the outside (for example, to the sea during a voyage) through the drain pipe 503.

The configuration of the injection section 30 will be explained in more detail.
Below, as shown in FIG. 2, the length in the vertical direction from the lower end 21B to the upper end 21A of the reaction tube 21 is defined as the height H. Further, the central axis of the reaction column 21 of this embodiment coincides with the central axis C of the absorption tower 20, and the same reference numeral as the central axis C of the absorption column 20 is also given to the central axis of the reaction column 21. In the reaction tube 21 of this embodiment, the direction of the height H and the central axis C are parallel.

In the direction of the height H of the reaction tube 21, the main pipe 31 is provided with a plurality of branch pipes 32 at predetermined intervals α. As shown in FIG. 3, the plurality of branch pipes 32 provided at the same height H are provided at equal intervals (equal angles) around the central axis C of the reaction tube 21. Hereinafter, the plurality of branch pipes 32 provided at the same height H will be collectively referred to as a "branch pipe group 32U" (FIG. 2). As shown in FIG. 2, each of the branch pipe groups 32U extends from below to above in the direction of the height H of the reaction tube 21 at a predetermined angle (however, 0 degrees < the predetermined angle <360 degrees) in the circumferential direction. That is, in a plan view from the direction of height H, each branch pipe group 32U is arranged so that the branch pipes 32 do not overlap with other vertically adjacent branch pipe groups 32U. . This arrangement of the branch pipe group 32U prevents the spiral flow of the exhaust gas A inside the reaction tube 21 from being disturbed non-uniformly by the branch pipes 32 of the injection section 30. Note that the number of branch pipes 32 included in the branch pipe group 32U may be one. Further, in the direction of the height H, the predetermined interval α may be constant or may be different. For example, the branch pipes 32 may be arranged densely at the location near the exhaust gas introduction section 210 by making the predetermined interval α smaller at the location near the exhaust gas introduction section 210 compared to the location near the upper end 21A.

FIG. 4 is an explanatory diagram of the flow velocity distribution of the exhaust gas A flowing inside the reaction tube 21.
Hereinafter, a plane perpendicular to the central axis C at a predetermined height position of the reaction tube 21 will be defined as an observation plane P. In this embodiment, since the direction of the height H is parallel to the vertical direction, the observation plane P is a horizontal plane perpendicular to the vertical direction. In addition, in the radial direction of the reaction tube 21, the peripheral surface of the main pipe 31 located at the central axis C and its vicinity are the first end Ra, the inner wall surface 21S of the reaction tube 21 and its vicinity are the second end Rb, and the vicinity thereof is the second end Rb. The area between the first end Ra and the second end Rb is defined as an intermediate portion Rc.

When observing the flow velocity distribution of the swirling flow of the exhaust gas A in the radial direction of the reaction tube 21, as shown in FIG. 4, the flow velocity distribution is not uniform in the observation plane P (that is, the flow velocity V is constant). Specifically, the flow velocity distribution has a curved shape with the maximum peak Vs located at the intermediate portion Rc. That is, the flow velocity V of the exhaust gas is higher at the intermediate portion Rc than at the first end Ra and the second end Rb. The tendency of the flow velocity distribution of the exhaust gas A is the same in any observation plane P at any height H of the reaction tube 21.

Therefore, if the spraying section 33 sprays the absorption liquid at a constant spray amount in the radial direction, there will be excess or deficiency in the amount of absorption liquid necessary for absorbing the harmful substance. Specifically, the absorption liquid is excessive at the first end Ra and the second end Rb of the reaction tube 21, and the absorption liquid is insufficient at the intermediate portion Rc. Therefore, in order to suppress excess or deficiency of the absorption liquid in the radial direction, in the spray portion 33 of each branch pipe 32, the spray amount distribution of the absorption liquid in the radial direction corresponds to the flow velocity distribution of the exhaust gas A in the radial direction. It becomes. Specifically, the position of the peak Qs (FIG. 5) of the spray amount distribution in the radial direction corresponds to the position of the peak Vs of the flow velocity distribution of the exhaust gas A in the radial direction.

FIG. 5 is a diagram showing the relationship between the flow velocity distribution of exhaust gas A, the spray amount distribution, and the residual concentration distribution of harmful substances in the radial direction. In FIG. 5, a mode U1 shows a case where the spray amount distribution corresponds to the flow velocity distribution of the exhaust gas A. In FIG. Specifically, in the spray amount distribution of aspect U1, the spray amount peak Qs is located at the radial intermediate portion Rc corresponding to the position of the peak Vs of the flow velocity distribution of the exhaust gas A. Aspect U2 is a comparative example with respect to aspect U1, and shows a case where the spray amount distribution is constant at all of the first end Ra, the second end Rb, and the intermediate portion Rc in the radial direction.
Comparing the distributions of the residual concentration of harmful substances in the aspect U1 and the aspect U2, in the radial intermediate portion Rc, the residual concentration in the aspect U1 is lower than that in the aspect U2. That is, as in aspect U1, the position of the peak Qs of the spray amount distribution in the radial direction is located at the position corresponding to the peak Vs of the flow velocity distribution of the exhaust gas A (namely, the intermediate portion Rc). This arrangement increases the amount of harmful substances absorbed at the peak Vs of the flow velocity distribution, and prevents a shortage of the absorption liquid at the position of the peak Vs of the flow velocity distribution.

Moreover, the first spray amount Q1 in the aspect U2 is set based on the total flow rate of the exhaust gas A flowing in the range from the first end Ra to the second end Rb. Specifically, the total amount of absorption liquid required to obtain a predetermined processing capacity (purification capacity in this embodiment) for the total content of harmful substances contained in the total flow rate of exhaust gas A is determined by the first end Ra. The first spray amount Q1 is set to a spray amount corresponding to the average value over the length from the first end Rb to the second end Rb, or a spray amount corresponding to the value.
On the other hand, in aspect U1, the second spray amount Q2 at the first end Ra and the third spray amount Q3 at the second end Rb are both set to be smaller than the first spray amount Q1 in aspect U2. . This setting suppresses excessive spraying of the absorption liquid at the first end Ra and the second end Rb.

Further, in aspect U1, the fourth spray amount Q4 of aspect U1 is set to the total value of the reduction amount of the absorption liquid at the first end Ra and the amount of absorption liquid reduction at the second end Rb as the upper limit. The amount is set to be larger than the first spray amount Q1. Note that the amount of absorption liquid reduction at the first end Ra corresponds to "first spray amount Q1 - second spray amount Q2", and the reduction amount of absorption liquid at the second end Rb corresponds to "first spray amount Q1 - This corresponds to the third spray amount Q3. With this setting, the total spray amount of aspect U1 over the range from the first end Ra to the second end Rb is suppressed to be at least equal to or less than the total spray amount of aspect U2. Therefore, the utilization efficiency of the absorption liquid in aspect U1 is higher than in aspect U2.

Next, a specific configuration for obtaining the spray amount distribution shown in aspect U1 of FIG. 5 will be described.
As described above, the injection section 30 has a plurality of branch pipes 32 extending in the radial direction from the main pipe 31, each of the branch pipes 32 is provided with a spray section 33, and the spray section 33 rotates the exhaust gas A. A plurality of nozzles 34 are provided for spraying the absorption liquid in the direction of the flow of the stream. As shown in FIG. 3, in each branch pipe 32, one nozzle 34 is provided at each of the first end Ra, the second end Rb, and the intermediate portion Rc. A spray amount distribution corresponding to the flow velocity distribution of the exhaust gas A is realized by balancing the spray amounts of the absorption liquid from each nozzle 34. Specifically, in the spraying section 33, the nozzle 34 in the middle section Rc of each nozzle 34 mainly sprays the absorption liquid toward the position of the peak Qs of the spray amount distribution, and The nozzle 34 at the end Rb mainly sprays the absorption liquid toward a position other than the peak Qs. The amount of spray from the nozzle 34 at this intermediate portion Rc is larger than the amount of spray from each of the first end Ra and the second end Rb. Further, the respective spray amounts of the first end Ra, the second end Rb, and the intermediate portion Rc are equal to the second spray amount Q2, the third spray amount Q3, and the fourth spray amount Q4 described in the above aspect U1. ing. Therefore, in each branch pipe 32, as shown in the aspect U1 of FIG. can get.

In addition, as long as the respective spray amounts of the first end Ra, the second end Rb, and the intermediate portion Rc are maintained at the second spray amount Q2, the third spray amount Q3, and the fourth spray amount Q4, the first end The number of nozzles 34 in each of the portion Ra, the second end Rb, and the intermediate portion Rc is not limited to one, but may be two or more. Moreover, the number of nozzles 34 may be different between each of the first end Ra, the second end Rb, and the intermediate part Rc. Further, nozzles 34 having different spray amounts may be combined at each of the first end Ra, the second end Rb, and the intermediate portion Rc.

As explained above, the exhaust gas treatment device 100 includes a cylindrical reaction tube 21 in which the introduced exhaust gas A moves while rotating, and an injection section 30 that injects an absorption liquid for treating the exhaust gas A inside the reaction tube 21. , is provided. The injection section 30 includes a main pipe 31 that extends on the central axis C of the reaction tube 21 and is supplied with an absorption liquid, a plurality of branch pipes 32 that extend from the main pipe 31 in the radial direction of the reaction tube, and a plurality of branch pipes. 32, and a spraying section 33 that sprays the absorption liquid in the direction of swirling of the exhaust gas A. The position of the peak Qs of the spray amount distribution of the absorption liquid in the radial direction of the spray part 33 corresponds to the position of the peak Vs of the flow velocity distribution of the exhaust gas A in the radial direction. Since the position of the peak Qs of the spray amount distribution of the absorption liquid corresponds to the position of the peak Vs of the flow velocity distribution in the radial direction of the exhaust gas A, the amount of harmful substances absorbed at the peak Vs of the flow velocity distribution increases, and the flow velocity of the exhaust gas A increases. Shortage of the absorption liquid is suppressed at the position of the peak Vs of the distribution. As a result, the processing performance of exhaust gas A can be improved.

Moreover, the peak Qs of the spray amount distribution of the absorption liquid in the radial direction of the spraying part 33 is at the first end Ra near the main pipe 31 and at the second end Rb near the inner wall surface 21S of the reaction tube 21. It is located at the intermediate portion Rc between the two. When the peak Vs of the flow velocity distribution of the exhaust gas A is located at the intermediate portion Rc, the shortage of the absorption liquid at the intermediate portion Rc can be appropriately suppressed.

In addition, in the spray amount distribution of the absorption liquid in the radial direction of the spray section 33, the second spray amount Q2 at the first end Ra and the third spray amount Q3 at the second end Rb are The total amount of absorption liquid required to treat the exhaust gas A flowing between the inner wall surface 21S and the inner wall surface 21S is smaller than the average amount over the length from the main pipe 31 to the inner wall surface 21S of the reaction tube 21. As a result, excessive spraying of the absorbent liquid at the first end Ra and the second end Rb is suppressed, and the utilization efficiency of the absorbent liquid is increased.

Further, the spray section 33 includes a plurality of nozzles 34 that spray the absorption liquid. Among the plurality of nozzles 34, the spray amount of the nozzle 34 that mainly sprays the absorption liquid toward the position of the peak Qs of the spray amount distribution of the absorption liquid is mainly directed to a position other than the peak Qs of the spray amount distribution of the absorption liquid. This is larger than the amount of spray from other nozzles 34 that spray absorption liquid toward the target. By balancing the spray amounts of the plurality of nozzles 34, a spray amount distribution corresponding to the flow velocity distribution of the exhaust gas A can be easily realized.

2. Second Embodiment FIG. 6 is a diagram schematically showing the configuration of the spray section 33 of the second embodiment.
In the first embodiment, in order to obtain the spray amount distribution of the absorption liquid shown in aspect U1 of FIG. The configuration has been described in which the spray amount of the nozzle 34 of the intermediate portion Rc is larger than the spray amount of each of the first end Ra and the second end Rb.
As shown in FIG. 6, the spraying section 33 of this embodiment is similar to the spraying section 33 of the first embodiment in that it includes a plurality of nozzles 34, but in the longitudinal direction of the branch pipe 32, the first end Ra and The difference is that the nozzles 34 are arranged more densely in the intermediate portion Rc than in the second end portion Rb. Specifically, as shown in FIG. 7, the nozzles 34 located at the first end Ra are arranged closer to the intermediate portion Rc by a distance β, so that the nozzles 34 are densely arranged in the intermediate portion Rc. There is. With this arrangement, the amount of spray at the intermediate portion Rc increases, and a spray amount distribution having a peak Qs of the amount of spray at the intermediate portion Rc is obtained.

According to the spray unit 33 of this embodiment, by adjusting the arrangement of the nozzles 34 in the longitudinal direction of the branch pipe 32, a spray amount distribution corresponding to the flow velocity distribution of the exhaust gas A can be easily realized.
In addition, in the spray section 33 of the second embodiment, the spray amount of each nozzle 34 may be the same or different. When the spray amount of each nozzle 34 is different, the arrangement of each nozzle 34 is adjusted so that the spray amount distribution corresponds to the flow velocity distribution of the exhaust gas A.

3. Modification Examples Specific modifications added to each of the above-mentioned embodiments are illustrated below. Two or more aspects arbitrarily selected from the examples below may be combined as appropriate to the extent that they do not contradict each other.

(1) In the first embodiment and the second embodiment, the case where the peak Vs of the flow velocity distribution in the radial direction of the exhaust gas A is located at the intermediate portion Rc has been described. However, if the peak Vs is located at the first end Ra or the second end Rb due to some factor such as the structure of the injection section 30 or the installation posture of the reaction tube 21, the amount of absorption liquid sprayed in the radial direction of the spray section 33 The position of the distribution peak Qs is also located at the first end Ra or the second end Rb. Further, in the direction of the height H of the reaction tube 21, if the position of the peak Vs of the flow velocity distribution differs depending on the height H, the position of the peak Qs of the spray amount distribution also differs depending on the height H. Further, when the flow velocity distribution of the exhaust gas A in the radial direction has a plurality of peaks Vs, the spray amount distribution also has a peak Qs at a position corresponding to each position of the plurality of peaks Vs.

(2) In the first embodiment and the second embodiment, the exhaust gas treatment apparatus 100 in which seawater is used as the absorption liquid is illustrated. However, the liquid used by the exhaust gas treatment device 100 to treat the exhaust gas A is not limited to seawater. Specifically, the liquid may be seawater, an amine solution, an alkaline aqueous solution, or an acidic aqueous solution, depending on the object to be treated contained in the exhaust gas A. For example, if the target to be treated is carbon dioxide, an amine solution may be used as the liquid. For example, when the object to be treated is hydrogen chloride, an alkaline aqueous solution or an acidic aqueous solution may be used as the liquid.

(3) In the first embodiment and the second embodiment, the case where the exhaust gas treatment device 100 is installed in the ship 200 is illustrated. However, the installation location is not limited to the ship 200. The installation location may be, for example, a factory.

21... Reaction tube, 21S... Inner wall surface, 30... Injection section, 31... Main pipe, 32... Branch pipe, 33... Spraying section, 34... Nozzle, 100... Exhaust gas treatment device, A... Exhaust gas, C... Central axis, Qs ...Peak of spray amount distribution, Rc...middle portion, Vs...peak of flow velocity distribution.

Claims (6)

A cylindrical reaction tube through which the introduced exhaust gas moves while rotating;
an injection unit that injects a liquid for treating the exhaust gas inside the reaction cylinder;
Equipped with
The injection part is
a main pipe extending on the central axis of the reaction cylinder and to which the liquid is supplied;
a plurality of branch pipes extending from the main pipe in a radial direction of the reaction cylinder;
a spraying unit provided in each of the plurality of branch pipes and spraying the liquid in the direction of swirling of the exhaust gas;
Equipped with
The position of the peak of the spray amount distribution of the liquid in the radial direction of the spray part corresponds to the position of the peak of the flow velocity distribution of the exhaust gas in the radial direction,
Exhaust gas treatment equipment. The peak of the spray amount distribution in the radial direction of the spray section is
The exhaust gas treatment device according to claim 1, wherein the exhaust gas treatment device is located at an intermediate portion between the main pipe and the inner wall surface of the reaction tube. In the spray amount distribution,
The respective spray amounts near the main pipe and near the inner wall surface of the reaction cylinder are:
The total amount of the liquid required to treat the exhaust gas flowing between the main pipe and the inner wall surface of the reaction cylinder is smaller than the average amount over the length from the main pipe to the inner wall surface of the reaction cylinder. The exhaust gas treatment device described in . The spray section includes:
comprising a plurality of nozzles that spray the liquid,
Among the plurality of nozzles, the spray amount of the nozzle that mainly sprays the liquid toward the position of the peak of the spray amount distribution mainly sprays the liquid toward a position other than the peak of the spray amount distribution. The exhaust gas treatment device according to claim 1, wherein the amount of spray is greater than that of the other nozzles. The spray section includes:
comprising a plurality of nozzles that spray the liquid,
The exhaust gas treatment device according to claim 1, wherein the nozzles are arranged more densely at a location corresponding to a peak position of the spray amount distribution than at other locations in the longitudinal direction of each of the plurality of branch pipes. The exhaust gas treatment device according to claim 1, wherein the liquid is seawater, an amine solution, an alkaline aqueous solution, or an acidic aqueous solution, depending on the object to be treated contained in the exhaust gas.

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