JP7105075B2 - Exhaust gas treatment device - Google Patents

Description

The present disclosure relates to an exhaust gas treatment device.

Exhaust gas treatment equipment using a cyclone scrubber is known as a removal device for absorbing and removing harmful components such as _SOX in exhaust gas discharged from internal combustion engines with a cleaning liquid such as seawater (for example, patent Reference 1).
This type of exhaust gas treatment apparatus sprays a cleaning liquid such as seawater into an absorption tower, passes the exhaust gas from the bottom to the top of the absorption tower, reacts with the cleaning liquid, and removes harmful components in the exhaust gas. Therefore, as one means of improving the removal rate of harmful components, a method of increasing the contact between the exhaust gas and the cleaning liquid is conceivable. In Patent Document 1, the exhaust gas is spirally swirled inside the absorption tower, and the arrangement of nozzle pipes for spraying the cleaning liquid in the exhaust gas flow path prevents the exhaust gas from advancing straight in the height direction. It is described that cleaning efficiency is improved by increasing the contact time.

JP 2016-155075 A

By improving the cleaning efficiency of harmful components contained in the exhaust gas, it is possible to reduce the processing time of the exhaust gas and to make the exhaust gas processing apparatus including the absorption tower more compact. Therefore, further improvement in cleaning efficiency is desired.

An object of one embodiment is to improve the absorption efficiency of harmful components in the exhaust gas by the cleaning liquid, thereby shortening the treatment time and making it possible to make the exhaust gas treatment apparatus including an absorption tower compact.

(1) An exhaust gas treatment device according to one embodiment includes:
An exhaust gas treatment device that absorbs and removes harmful components in the exhaust gas by contacting the exhaust gas with a cleaning liquid,
an absorption tower body having an internal space;
a spray unit that sprays the cleaning liquid into the internal space;
an exhaust gas introduction section that introduces exhaust gas so as to swirl in the internal space;
with
Concavities and convexities are formed on the inner peripheral surface of the absorption tower body facing the internal space.

According to the configuration (1) above, the exhaust gas introduced from the exhaust gas introduction portion into the internal space of the absorber main body swirls in the internal space, so that the exhaust gas flows biased toward the inner peripheral surface facing the internal space. By forming unevenness on the inner peripheral surface of the absorber body, the contact area (hereinafter also simply referred to as "contact area") where the cleaning liquid and the exhaust gas coming in contact with each other on the inner peripheral surface is increased. As a result, contact between the cleaning liquid and the exhaust gas is enhanced, so that removal efficiency (hereinafter also referred to as "cleaning efficiency") for removing harmful components in the exhaust gas can be improved. In addition, by increasing the cleaning efficiency, it is possible to shorten the processing time of the exhaust gas and to make the exhaust gas processing apparatus including the absorption tower compact.
In addition, the contact area can be increased by simple means without additionally installing a device requiring a driving force or providing any structure in the internal space of the absorption tower body.

(2) In one embodiment, in the configuration of (1),
The exhaust gas introduction part is provided in the lower part of the absorption tower body, and an exhaust gas discharge part is provided in the uppermost part of the absorption tower body, and the exhaust gas introduced from the exhaust gas introduction part swirls in the internal space. configured to rise,
The unevenness is formed on the inner peripheral surface on which the liquid film of the cleaning liquid sprayed from the spray section is formed.
According to the above configuration (2), since the unevenness is formed on the inner peripheral surface of the absorption tower where the liquid film of the cleaning liquid sprayed from the spray part is formed, the cleaning liquid and the exhaust gas flowing along the inner peripheral surface are separated. The contact area to contact can be increased. As a result, the contact between the cleaning liquid and the exhaust gas is enhanced, and the cleaning efficiency of the exhaust gas can be improved.

(3) In one embodiment, in the configuration of (1) or (2),
A mist eliminator is provided in the inner space above the spray portion, the inner peripheral surface on which the unevenness is formed, and the exhaust gas introduction portion.
According to the above configuration (3), the mist (liquid content) of the cleaning liquid that has absorbed the harmful components from the exhaust gas can be removed by the mist eliminator provided on the most downstream side of the exhaust gas rising in the absorption tower body, so that the exhaust gas is purified. Only exhaust gas can be discharged to the outside.

(4) In one embodiment, in any one of the configurations (1) to (3),
The unevenness is formed along the circumferential direction of the absorber tower body and includes one or more grooves extending over the entire circumferential direction of the inner circumferential surface when viewed from the axial direction of the absorber tower body. be done.
According to the above configuration (4), the unevenness includes one or more grooves extending along the entire circumference of the inner peripheral surface along the circumferential direction of the absorber body. It is possible to increase the contact area where the cleaning liquid and the exhaust gas contact, thereby improving the cleaning efficiency of the exhaust gas.

(5) In one embodiment, in any one of the configurations (1) to (3),
The unevenness is formed along the axial direction of the absorber tower body and includes one or more grooves provided over the entire circumferential direction of the inner peripheral surface when viewed from the axial direction of the absorber tower body. be.
According to the configuration (5) above, since the unevenness is formed along the axial direction of the absorber tower body and includes one or more grooves provided along the entire circumference of the inner peripheral surface, the inner peripheral surface It is possible to increase the contact area where the cleaning liquid and the exhaust gas contact with each other along the surface, thereby improving the cleaning efficiency of the exhaust gas.

(6) In one embodiment, in any one of the configurations (1) to (3),
The unevenness includes one or more spiral grooves that are provided over the entire circumferential direction of the inner peripheral surface and that are spirally formed on the inner peripheral surface.
According to the configuration of (6) above, since the unevenness includes one or more spiral grooves formed over the entire circumferential direction on the inner peripheral surface of the absorber body, It is possible to increase the contact area of contact with the exhaust gas, thereby improving the cleaning efficiency of the exhaust gas. Also, the spiral groove is easy to form.
When the spiral groove is formed in the same direction as the swirling direction of the exhaust gas, damping of swirling can be reduced compared to the case where the spiral groove is formed in a direction different from the swirling direction of the exhaust gas.

(7) In one embodiment, in any one of the configurations (1) to (3),
The irregularities are formed dispersedly on the inner peripheral surface, and include a plurality of first convex portions provided over the entire circumferential direction of the inner peripheral surface when viewed from the axial direction of the absorber tower body. .
According to the above configuration (7), since the unevenness is configured to include the first convex portion, the contact area of the cleaning liquid and the exhaust gas coming into contact with each other along the inner peripheral surface can be increased, thereby increasing the amount of exhaust gas. Cleaning efficiency can be improved.

(8) In one embodiment, in any one of the configurations (1) to (7),
The flue gas introduction part is composed of a flue gas introduction pipe connected to the absorption tower body,
The exhaust gas introduction pipe includes a linear straight pipe portion provided at a connection portion with the absorption tower body,
The straight pipe portion has a plurality of second projections dispersedly arranged on the inner peripheral surface of the straight pipe portion.
According to the configuration (8) above, since the plurality of second convex portions are provided in a dispersed manner on the inner peripheral surface of the straight pipe portion, it is possible to suppress drift of the exhaust gas flowing through the straight pipe portion. As a result, the flue gas can be introduced into the absorber body while suppressing the unevenness of the concentration distribution and flow velocity distribution of the harmful components contained in the flue gas flowing through the straight pipe section, so the contact between the flue gas and the cleaning liquid in the internal space of the absorber body can be increased, and the exhaust gas cleaning efficiency can be improved.

(9) In one embodiment, in the configuration of (7),
The spray part is provided on each of the plurality of first protrusions.
According to the above configuration (9), since the spray portion is provided on the first convex portion provided on the inner peripheral surface of the absorber main body, it is not necessary to provide the spray portion in the central portion of the internal space of the absorber main body. As a result, the space for contacting the cleaning liquid and the exhaust gas can be increased, so that the contact between the exhaust gas and the cleaning liquid can be increased, and the cleaning efficiency of the exhaust gas can be improved.
Further, when the exhaust gas swirls in the internal space of the absorption tower main body, the exhaust gas is biased toward the inner peripheral surface. Therefore, if the cleaning liquid discharge port of the spray section provided in the first projection is directed toward the inner peripheral surface so that the cleaning liquid is densely distributed to the inner peripheral surface side, a large amount of cleaning liquid can be discharged to the area where the exhaust gas is abundant. Therefore, cleaning efficiency can be improved.

(10) In one embodiment, in the configuration of (9),
The spray section is configured to spray the cleaning liquid from each of the plurality of first projections toward the swirling direction of the exhaust gas.
The swirl force of the exhaust gas is attenuated by the contact between the cleaning liquid and the exhaust gas in the internal space of the absorber body. According to the configuration (10) above, the attenuation of the exhaust gas can be reduced by spraying the cleaning liquid from the first convex portion toward the swirling direction of the exhaust gas. As a result, the contact between the exhaust gas and the cleaning liquid can be enhanced, and the cleaning efficiency of the exhaust gas can be improved.

(11) In one embodiment, in the configuration of any one of (1) to (8),
The spray section is
a trunk pipe extending along the central axis of the absorber body in the internal space;
one or more branch pipes extending from the trunk pipe toward the inner peripheral surface;
a spray nozzle for spraying the cleaning liquid supplied from the branch pipe;
Consists of
According to the above configuration (11), the spray nozzle sprays the cleaning liquid from the branch pipe toward the inner peripheral surface of the absorber main body, so that the cleaning liquid can be uniformly sprayed into the inner space and the inner peripheral surface can be sprayed. A cleaning liquid film can be uniformly formed over the entire circumference. As a result, the contact between the cleaning liquid and the exhaust gas can be enhanced, and the cleaning efficiency of the exhaust gas can be improved.

(12) In one embodiment, in any one of the configurations (1) to (8),
The spray part is provided in the inner space above the inner peripheral surface on which the unevenness is formed and the exhaust gas introduction part,
The spray section is
It is configured to include a nozzle pipe supplied with the washing liquid, extending along the cross-sectional direction of the absorber body, and provided with a plurality of dispersed nozzles.
According to the above configuration (12), the nozzle pipe extends along the cross-sectional direction of the absorber main body at the top of the absorber main body. , and is evenly dispersed in the inner space below. Moreover, since it is not necessary to provide a spray section in the internal space, the contact space between the exhaust gas and the cleaning liquid can be increased. As a result, the contact between the cleaning liquid and the exhaust gas can be enhanced, and the cleaning efficiency of the exhaust gas can be improved. Also, the spray section can be configured simply by providing a nozzle pipe.

(13) In one embodiment, in the configuration of any of (7), (9) or (10),
The first convex portion has a polygonal pyramidal shape, a conical shape, a truncated pyramidal shape, a prismatic shape, a cylindrical shape, a spherical shape, an elliptical shape, a three-dimensional shape having a half-moon cross section, or a three-dimensional shape having a wavy cross section.
According to the configuration (13) above, since the first convex portion provided on the inner peripheral surface of the absorber body has the above shape, it is possible to increase the contact area in which the cleaning liquid and the exhaust gas that run along the inner peripheral surface come into contact with each other. As a result, the contact between the cleaning liquid and the exhaust gas can be enhanced, and the cleaning efficiency of the exhaust gas can be improved.

(14) In one embodiment, in the configuration of (8),
The second projection has a polygonal pyramid shape, a conical shape, a truncated cone shape, a prismatic shape, a cylindrical shape, a spherical shape, an elliptical shape, a three-dimensional shape having a half-moon cross section, or a three-dimensional shape having a wavy cross section.
According to the above configuration (14), the second convex portion provided on the inner peripheral surface of the straight pipe portion of the exhaust gas introduction pipe has the above shape, so that the drift of the exhaust gas flowing through the straight pipe portion can be effectively suppressed. Therefore, since a uniform flue gas flow can be introduced into the internal space of the absorption tower body, the contact between the flue gas and the cleaning liquid in the absorption tower body can be enhanced, and the cleaning efficiency of the exhaust gas can be improved.

According to some embodiments, the efficiency of cleaning the exhaust gas with the cleaning liquid can be improved, thereby
The exhaust gas treatment time can be shortened, and the exhaust gas treatment apparatus including the absorption tower can be made compact.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows roughly the waste gas treatment apparatus which concerns on one Embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows roughly the waste gas treatment apparatus which concerns on one Embodiment. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1; 1 is a longitudinal sectional view schematically showing part of an absorption tower body according to one embodiment; FIG. It is a perspective view which shows the unevenness|corrugation which concerns on one Embodiment typically. It is a perspective view which shows the unevenness|corrugation which concerns on one Embodiment typically. BRIEF DESCRIPTION OF THE DRAWINGS It is a cross-sectional view which shows schematically the waste gas treatment apparatus which concerns on one Embodiment. (A), (B), and (C) are perspective views showing asperities according to some embodiments. (A) and (B) are perspective views showing asperities according to some embodiments. (A) and (B) are perspective views showing asperities according to some embodiments. It is a perspective view which shows the unevenness|corrugation which concerns on one Embodiment. (A) and (B) are perspective views showing asperities according to some embodiments. (A) and (B) are perspective views showing asperities according to some embodiments.

Several embodiments of the present invention will now be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as the embodiment or shown in the drawings are not meant to limit the scope of the present invention, but merely illustrative examples.
For example, expressions denoting relative or absolute arrangements such as "in a direction", "along a direction", "parallel", "perpendicular", "center", "concentric" or "coaxial" are strictly not only represents such an arrangement, but also represents a state of relative displacement with a tolerance or an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous", which express that things are in the same state, not only express the state of being strictly equal, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, expressions that express shapes such as squares and cylinders do not only represent shapes such as squares and cylinders in a geometrically strict sense, but also include irregularities and chamfers to the extent that the same effect can be obtained. The shape including the part etc. shall also be represented.
On the other hand, the expressions "comprising", "comprising", "having", "including", or "having" one component are not exclusive expressions excluding the presence of other components.

1 and 2 are schematic longitudinal sectional views showing exhaust gas treatment apparatuses 10 (10A, 10B) according to some embodiments.
1 and 2, an internal space s is formed inside an absorption tower body 12, and a spray section 14 (14a, 14b) for spraying a cleaning liquid Cs into the internal space s is provided. Exhaust gas e emitted from an internal combustion engine (not shown), for example, is introduced into the internal space s by the exhaust gas introduction portion 16 . At that time, the exhaust gas e is introduced by the exhaust gas introduction part 16 so as to swirl in the internal space s. The exhaust gas e introduced into the internal space s comes into contact with the cleaning liquid Cs sprayed into the internal space s, whereby harmful components such as _SOX contained in the exhaust gas e are absorbed and removed by the cleaning liquid Cs. Concavities and convexities 18 are formed on the inner peripheral surface 12a of the absorption tower body 12 facing the internal space s. A specific configuration of the unevenness 18 is illustrated in FIGS. 3 to 6. FIG.

3 is a cross-sectional view taken along line A--A in FIG. 1. FIG. As shown in FIG. 3, the exhaust gas introduction part 16 according to one embodiment is arranged along the cross section of the absorber body 12 and along the tangential direction of the outer peripheral surface of the absorber body. Composed of tubes. The exhaust gas e introduced from this exhaust gas introduction pipe forms a swirling flow fs in the internal space s. The cleaning liquid Cs sprayed from the spray section 14 diffuses into the internal space s and adheres to the inner peripheral surface 12a to form a liquid film.
When the cleaning liquid Cs is, for example, alkaline seawater, the _SOx contained in the exhaust gas e reacts with the alkali contained in the seawater to be neutralized and rendered harmless. As the washing liquid, in addition to seawater, lake water, river water, alkalinized treated water, or the like can be used.

According to this embodiment, the unevenness 18 is formed on the inner peripheral surface 12a of the absorber main body 12, so that the contact area between the cleaning liquid Cs and the exhaust gas e that run along the inner peripheral surface 12a is increased. On the other hand, the swirl flow fs formed by the exhaust gas e flows biased toward the inner peripheral surface 12a due to the centrifugal force of the swirl flow fs. As a result, the contact between the cleaning liquid Cs and the exhaust gas e is enhanced, and the cleaning efficiency of the exhaust gas can be improved. In addition, since the cleaning efficiency is increased, the exhaust gas treatment time can be shortened, and the exhaust gas treatment apparatus 10 including the absorption tower main body 12 can be made compact.
In addition, the contact area between the cleaning liquid and the exhaust gas is increased by a simple means of forming the unevenness 18 on the inner peripheral surface 12a without additionally installing a device requiring a driving force or providing any structure in the internal space s. can.

In one embodiment, as shown in FIGS. 1 and 2 , the flue gas introduction section 16 is provided at the bottom of the absorber body 12 and the flue gas discharge section 20 is provided at the top of the absorber body 12 . The exhaust gas e introduced from the exhaust gas introduction part 16 rises while swirling in the internal space s, and is discharged from the exhaust gas discharge part 20 to the outside. The unevenness 18 is formed on the inner peripheral surface 12a on which the liquid film of the cleaning liquid Cs sprayed from the spray portion 14 is formed.
According to this embodiment, since the unevenness 18 is formed on the inner peripheral surface 12a on which the liquid film of the cleaning liquid Cs sprayed from the spray portion 14 is formed, the cleaning liquid Cs running along the inner peripheral surface 12a comes into contact with the exhaust gas e. contact area increases. As a result, contact between the cleaning liquid and the exhaust gas is enhanced, and the removal rate of harmful components in the exhaust gas can be improved.

In one embodiment, as shown in FIGS. 1 and 2 , a mist eliminator 22 is provided in the inner space s above the spray portion 14 , the inner peripheral surface 12 a on which the unevenness 18 is formed, and the exhaust gas introduction portion 16 .
According to this embodiment, harmful components such as SOx are absorbed from the flue gas e by the mist eliminator 22 provided on the most downstream side of the flue gas e rising in the absorber main body 12, that is, at the top of the absorber main body 12. Since the mist (liquid content) of the cleaning liquid can be removed, only purified exhaust gas can be released to the outside.

In one embodiment, as shown in FIGS. 1 and 2, the absorber main body 12 includes an absorber 21 that sprays the cleaning liquid Cs to render the exhaust gas e harmless, and is provided above the absorber 21 to detoxify the exhaust gas e. and an exhaust gas discharge section 20 from which exhaust gas e is discharged. In addition, the liquid is discharged from the liquid drainage path 23 provided on the bottom surface.
In one embodiment, the cross-section of absorber tower body 12 may be circular or elliptical, or may be square.

As shown in FIG. 3, the unevenness 18 (18a) according to one embodiment includes one or more grooves 24 formed along the axial direction of the absorber body 12 (direction of arrow a in FIG. 1). Configured. When viewed from the axial direction of the absorber tower body 12, the grooves 24 are provided over the entire circumferential area of the inner peripheral surface 12a.
According to this embodiment, since the unevenness 18 (18a) is configured to include one or more grooves 24, it is possible to increase the contact area where the cleaning liquid Cs running along the inner peripheral surface 12a contacts the exhaust gas e. , the exhaust gas cleaning efficiency can be improved.
Here, "the irregularities 18 (18a) are formed along the axial direction" means that the irregularities 18 (18a) are formed at an inclination angle of 0 to 30 degrees with respect to the axial direction.

FIG. 4 is a schematic longitudinal sectional view showing part of the absorption tower main body 12 according to one embodiment.
As shown in FIG. 4, the unevenness 18 (18b) according to one embodiment is formed along the circumferential direction of the absorber main body 12, and when viewed from the axial direction of the absorber tower main body 12, the irregularities 18 (18b) are formed along the circumference of the inner peripheral surface 12a. It comprises one or more grooves 26 extending in all directions.
According to this embodiment, the unevenness 18 (18b) includes one or more grooves 26 extending along the entire circumference of the inner peripheral surface 12a along the circumferential direction of the absorber body 12. The contact area between the cleaning liquid Cs running along the peripheral surface 12a and the exhaust gas e can be increased, thereby improving the cleaning efficiency of the exhaust gas.
Here, "the unevenness 18 (18b) is formed along the circumferential direction" means that the unevenness 18 (18b) is 0 to 30 degrees with respect to the cross section perpendicular to the axial direction of the absorber main body 12. is formed with an inclination angle of

FIG. 5 is a perspective view schematically showing the absorption tower main body 12. As shown in FIG. As shown in FIG. 5, the unevenness 18 (18c) according to one embodiment is provided over the entire circumferential direction of the inner peripheral surface 12a, and includes one or more spiral grooves 28 spirally formed on the inner peripheral surface 12a. Consists of
According to this embodiment, since the unevenness 18 (18c) is provided in the entire circumferential direction of the inner peripheral surface 12a, it is possible to increase the contact area where the cleaning liquid Cs running along the inner peripheral surface 12a and the exhaust gas e come into contact with each other. Exhaust gas cleaning efficiency can be improved. Further, the spiral grooves are easy to form, and when the spiral grooves 28 are formed in the same direction as the swirling flow fs of the exhaust gas e, the spiral grooves 28 are formed in a direction different from the swirling direction of the exhaust gas e. Attenuation of turning can be reduced compared to the case.

Grooves 24, 26 or helical grooves 28 can be formed singly or two or more in parallel. Further, it is formed on at least the inner peripheral surface 12a of the inner wall surface of the absorption tower body 12, but in addition to the inner peripheral surface 12a, for example, as shown in FIG. good. Further, these grooves are formed over the entire circumferential direction of the inner peripheral surface 12 a when viewed from the axial direction of the absorber tower body 12 . Moreover, it is desirable that the grooves 24, 26 or the spiral groove 28 have a depth equal to or greater than the liquid film of the cleaning liquid Cs formed on the inner peripheral surface 12a, for example, a depth equal to or greater than 5 mm.

FIG. 6 is a perspective view schematically showing the absorption tower main body 12. As shown in FIG. As shown in FIG. 6, the unevenness 18 (18d) according to one embodiment includes a plurality of protrusions 30 (first protrusions) dispersedly formed on the inner peripheral surface 12a. When viewed from the axial direction of the absorber tower body 12, the convex portion 30 is provided over the entire circumferential area of the inner peripheral surface 12a.
According to this embodiment, by forming the unevenness 18 (18d) including the plurality of protrusions 30, it is possible to increase the contact area where the cleaning liquid Cs running along the inner peripheral surface 12a contacts the exhaust gas e. Exhaust gas cleaning efficiency can be improved.
The plurality of protrusions 30 should be distributed and arranged without overlapping, thereby forming the unevenness 18 (18d) that enables an increase in contact area.
In one embodiment, the height of the projections 30 from the inner peripheral surface 12a and the interval between the projections 30 are set within a range in which an increase in the pressure loss of the exhaust gas e passing through the internal space s does not hinder the operation of the exhaust gas treatment device 10. There is a need to.

As shown in FIG. 6 , in one embodiment, a plurality of projections 30 are formed at points symmetrical with respect to the central axis O of the absorber body 12 . Thereby, the contact area between the cleaning liquid and the exhaust gas can be uniformly increased on the cross section of the internal space s.
The protrusions 30 may be formed integrally with the inner peripheral surface 12a at the same time when the inner peripheral surface 12a is manufactured, or may be fabricated separately from the inner peripheral surface 12a, and may be formed on the inner peripheral surface after the inner peripheral surface 12a is manufactured. 12a.

In one embodiment, the inner surface of the absorption tower body 12 (more precisely, the entire inner surface including the inner peripheral surface and the bottom surface of the absorption tower body 12 in the lower region of the mist eliminator 22 in FIGS. 1 and 2) is provided with unevenness 18. The blockage rate is defined as 0% when the unevenness 18 is not provided at all, and is defined as 100% when the unevenness 18 is provided on the entire inner surface. In this case, it is desirable to set the clogging rate to 50% or less. If the blockage rate exceeds 50%, the pressure loss of the exhaust gas e inside the absorption tower body 12 increases, and the swirling force of the exhaust gas e is attenuated.

In one embodiment, as shown in FIG. 2, the flue gas introduction section 16 is composed of an flue gas introduction pipe connected to the absorption tower main body 12, and the connecting portion of the flue gas introduction pipe to the absorption tower main body 12 is straight. It is composed of a pipe portion 32 . As shown in FIG. 2, the straight pipe portion 32 is arranged along the tangential direction of the outer peripheral surface of the absorber body 12, and the exhaust gas e introduced from the straight pipe portion 32 forms a swirling flow fs in the internal space s. do. Further, a plurality of protrusions 34 (second protrusions) are dispersedly arranged on the inner peripheral surface of the straight tube portion 32 .

If there is a bend portion or the like on the upstream side of the straight pipe portion 32, the exhaust gas that has flowed into the straight pipe portion 32 tends to drift. According to this embodiment, since a plurality of protrusions 34 are provided in a distributed manner on the inner peripheral surface of the straight pipe portion 32, drift of the exhaust gas e flowing through the straight pipe portion 32 can be suppressed. As a result, the concentration distribution and flow velocity distribution of harmful components such as SO 2 _X contained in the exhaust gas e flowing through the straight pipe portion 32 can be suppressed, and the exhaust gas e can be introduced into the internal space s as a uniform flow. Therefore, the contact space between the exhaust gas and the cleaning liquid in the internal space s can be increased, thereby enhancing the contact between the exhaust gas and the cleaning liquid and improving the removal rate of harmful components in the exhaust gas.

The plurality of protrusions 34 are arranged in a dispersed manner without overlapping, thereby enhancing the effect of suppressing drift of the exhaust gas e flowing through the straight pipe portion 32 . Further, it is necessary to set the height of the projections 34 from the inner peripheral surface 12a and the interval between the projections 34 within a range in which an increase in the pressure loss of the exhaust gas e passing through the straight pipe portion 32 does not hinder the operation of the exhaust gas treatment device 10. There is
It is desirable that the convex portion 34 be formed on the entire inner circumferential surface of the straight pipe portion 32 in the circumferential direction. Further, the inner peripheral surface may be formed integrally with the inner peripheral surface at the time of manufacturing the inner peripheral surface of the straight tube portion 32, or the inner peripheral surface may be manufactured separately from the inner peripheral surface and the inner peripheral surface may be formed after the inner peripheral surface is manufactured. may be attached to the

In one embodiment, the blockage rate is 0% when no projections 34 are provided on the inner peripheral surface of the straight pipe portion 32, and the blockage rate is defined when the projections 34 are provided on the entire inner peripheral surface of the straight pipe portion 32. 100%. In this case, it is desirable to set the clogging rate to 50% or less. If the blockage rate exceeds 50%, the concentration distribution and the flow velocity distribution of harmful components such as SOx can be suppressed as an action of the convex part 34, but the pressure loss increases, so the flow velocity of the exhaust gas e decreases. , the swirling force inside the absorber body may decrease.

In one embodiment, as shown in FIG. 1, the spray portion 14 (14a) includes a main pipe 40 extending along the central axis O of the internal space s and a main pipe 40 extending from the main pipe 40 toward the inner peripheral surface 12a. It includes one or more existing branch pipes 42 and a spray nozzle 44 for spraying the cleaning liquid Cs supplied from the branch pipes 42 .
According to this embodiment, since the spray part 14 (14a) is provided in the central part of the internal space s in the axial direction, the cleaning liquid Cs is sprayed from the central part of the internal space s to the entire circumference of the inner peripheral surface 12a by the spray nozzle 44. By spraying toward, the cleaning liquid Cs can be uniformly sprayed into the internal space s, and a cleaning liquid film can be formed uniformly over the entire circumferential direction of the inner peripheral surface 12a. As a result, the contact between the cleaning liquid and the exhaust gas is enhanced, and the cleaning efficiency of the exhaust gas can be improved.

In one embodiment, spray nozzle 44 is attached to branch 42 . Preferably, by being attached to the tip of the branch pipe 42, the cleaning liquid Cs can be sprayed from near the inner peripheral surface 12a toward the inner peripheral surface 12a. This makes it easier to form a liquid film of the cleaning liquid Cs on the inner peripheral surface 12a.
The branch pipe 42 may be arranged on a cross section perpendicular to the axial direction of the absorber body 12, or may be arranged in a direction inclined vertically from the cross section.
The cleaning liquid spraying direction of the spray nozzle 44 is appropriately set so that the cleaning liquid Cs is uniformly diffused in the internal space s, or so that a liquid film of the cleaning liquid Cs is reliably formed on the inner peripheral surface 12a.

In one embodiment, as shown in FIG. 2 , the spray portion 14 ( 14 b ) is provided in an internal space s above the inner peripheral surface 12 a on which the unevenness 18 is formed and the exhaust gas introduction portion 16 . The cleaning liquid Cs is supplied to the spray section 14 (14b). The spray section 14 (14b) extends along the cross section of the absorber body 12 and includes a nozzle pipe 46 in which a plurality of nozzles 48 are dispersedly arranged.
According to this embodiment, the spray part 14 (14b) extends along the cross section of the absorber main body 12 at the uppermost part of the absorber main body 12. Therefore, when the washing liquid is sprayed from the nozzle pipe 46, the sprayed washing liquid Cs descends by gravity and is uniformly dispersed in the lower internal space s. Moreover, since it is not necessary to provide a spray section in the lower internal space s, the contact space between the exhaust gas and the cleaning liquid can be increased. As a result, the contact between the cleaning liquid and the exhaust gas is enhanced, and the cleaning efficiency of the exhaust gas can be improved. In addition, the spray section 14 (14b) can be configured simply by providing the nozzle pipe 46 only.

Here, "the spray portion 14 (14b) extends along the cross section of the absorber body 12" means that the inclination is 0 to 30 degrees with respect to the cross section perpendicular to the axial direction of the absorber body 12. means extending at the corners.

In one embodiment, a cleaning liquid supply pipe 50 is introduced from the outside of the absorber main body 12 into the internal space s and connected to the nozzle pipe 46 , and the cleaning solution Cs is supplied from the cleaning liquid supply pipe 50 to the nozzle pipe 46 .
In one embodiment, nozzle tube 46 comprises an annular nozzle tube. For example, by increasing the diameter of the annular nozzle tube and disposing the nozzle 48 at a position close to the inner peripheral surface 12a, it becomes easier to form a liquid film of the cleaning liquid on the inner peripheral surface 12a.
In addition, the nozzle pipe 46 can be selected from any shape other than the annular shape that can uniformly spray the lower internal space s.

In one embodiment, as shown in FIG. 7, the spray portion 14 (14c) is provided on each of the plurality of convex portions 30. As shown in FIG. In the figure, the angle θ indicates the spray angle of the cleaning liquid Cs.
According to this embodiment, since the spray portion 14 (14c) is provided on the convex portion 30 provided on the inner peripheral surface 12a, it is not necessary to provide the spray portion in the central portion of the internal space s. Therefore, the pressure loss of the exhaust gas flowing through the internal space s can be reduced, and the space for contacting the cleaning liquid and the exhaust gas can be increased accordingly, so that the contact between the exhaust gas and the cleaning liquid can be improved, and the cleaning efficiency of the exhaust gas can be improved. .
The nozzle port of the spray part 14 (14c) may be arranged in a direction inclined vertically with respect to a cross section orthogonal to the axial direction of the absorber body 12, or the inner peripheral surface You may arrange|position giving an angle to the circumferential direction of 12a.

Further, when the exhaust gas e swirls in the internal space s, the exhaust gas e is biased toward the inner peripheral surface 12a. Therefore, if the nozzle port for spraying the cleaning liquid from the spray portion 14 (14c) is directed toward the inner peripheral surface side so that the cleaning liquid is densely spread to the inner peripheral surface side, a large amount of cleaning liquid can be discharged into the space with a large amount of exhaust gas. This can improve cleaning efficiency.

In one embodiment, the spray part 14 (14c) is configured to spray the cleaning liquid from each of the plurality of convex parts 30 toward the swirling direction of the exhaust gas.
The swirling force of the exhaust gas is attenuated by the contact between the cleaning liquid and the exhaust gas in the internal space of the absorption tower body. According to this embodiment, the attenuation of the swirling force of the exhaust gas can be reduced by spraying the cleaning liquid from the first projection toward the swirling flow fs of the exhaust gas.

In one embodiment, the spray portions 14 ( 14 c ) are distributed over the entire circumference of the inner peripheral surface 12 a when viewed from the axial direction of the absorber body 12 . As a result, the cleaning liquid can be evenly distributed throughout the internal space s.
The convex portion 30 on which the spray portion 14 (14c) is provided can be arbitrarily selected according to the purpose. may be placed.
Also, the directions of the plurality of nozzle openings of the spray section 14 (14c) are preferably adjusted so that the cleaning liquid sprayed from each nozzle opening does not face each other.

In some embodiments, as shown in FIGS. 8-13, protrusions 30 and 34 can have various shapes.
For example, as shown in FIG. 8, it may have a polygonal pyramid shape or a truncated pyramid shape. For example, (A) of FIG. 8 illustrates a hexagonal pyramid, (B) illustrates a triangular pyramid, and (C) illustrates a truncated triangular pyramid.
Due to the above-described shape, the contact area of the cleaning liquid and the exhaust gas coming into contact along the inner peripheral surface 12a can be increased. As a result, the contact between the cleaning liquid and the exhaust gas can be enhanced, and the cleaning efficiency of the exhaust gas can be improved.

For example, as shown in FIG. 9, protrusions 30 and 34 can be conical or frustoconical. FIG. 10A shows a conical one, and FIG. 10B shows a truncated conical one.
Due to the above shape, the contact area of the cleaning liquid running along the inner peripheral surface 12a and the exhaust gas can be increased. As a result, the contact between the cleaning liquid and the exhaust gas can be enhanced, and the cleaning efficiency of the exhaust gas can be improved.

For example, as shown in FIG. 10, protrusions 30 and 34 can be prismatic. For example, (A) of FIG. 9 exemplifies a square prism shape, and (B) illustrates a triangular prism shape.
Due to the above-described shape, the contact area of the cleaning liquid and the exhaust gas coming into contact along the inner peripheral surface 12a can be increased. As a result, the contact between the cleaning liquid and the exhaust gas can be enhanced, and the cleaning efficiency of the exhaust gas can be improved.

For example, as shown in FIG. 11, protrusions 30 and 34 can be cylindrical.
Due to the above-described shape, the contact area of the cleaning liquid and the exhaust gas coming into contact along the inner peripheral surface 12a can be increased. As a result, the contact between the cleaning liquid and the exhaust gas can be enhanced, and the cleaning efficiency of the exhaust gas can be improved.

For example, as shown in FIG. 12, protrusions 30 and 34 can be spherical or ellipsoidal. FIG. 10A shows a spherical shape, and FIG. 10B shows an ellipsoidal shape.
Due to the above-described shape, the contact area of the cleaning liquid and the exhaust gas coming into contact along the inner peripheral surface 12a can be increased. As a result, the contact between the cleaning liquid and the exhaust gas can be enhanced, and the cleaning efficiency of the exhaust gas can be improved.

For example, as shown in FIG. 13, the projections 30 and 34 may have a three-dimensional shape having a half-moon shape or a three-dimensional shape having a wavy cross section. FIG. 13A illustrates a three-dimensional cross section 52 having a half-moon shape, and FIG. 13B illustrates a three-dimensional cross section 54 having a wavy shape.
Due to the above-described shape, the contact area of the cleaning liquid and the exhaust gas coming into contact along the inner peripheral surface 12a can be increased. As a result, the contact between the cleaning liquid and the exhaust gas can be enhanced, and the cleaning efficiency of the exhaust gas can be improved.

According to some embodiments, by improving the absorption efficiency of the harmful components in the exhaust gas by the cleaning liquid, the treatment time can be shortened, and the exhaust gas treatment apparatus including the absorption tower can be made compact.

Reference Signs List 10 (10A, 10B) exhaust gas treatment device 12 absorption tower main body 12a inner peripheral surface 14 (14a, 14b, 14c) spray section 16 exhaust gas introduction section 18 (18a, 18b, 18c, 18d) unevenness 20 exhaust gas discharge section 21 absorption section 22 Mist eliminator 23 drainage channel 24, 26 groove 28 spiral groove 30 convex portion (first convex portion)
32 straight tube portion 34 convex portion (second convex portion)
40 Main pipe 42 Branch pipe 44 Spray nozzle 46 Nozzle pipe 48 Nozzle 50 Cleaning liquid supply pipe 52, 54 Section Cs Cleaning liquid a Axial direction e Exhaust gas fs Swirling flow s Internal space

Claims (6)

An exhaust gas treatment device that absorbs and removes harmful components contained in the exhaust gas by contacting the exhaust gas with a cleaning liquid,
an absorption tower body having an internal space;
a spray unit that sprays the cleaning liquid into the internal space;
an exhaust gas introduction section that introduces the exhaust gas so as to swirl in the internal space;
with
Concavities and convexities are formed on an inner peripheral surface of the absorption tower body facing the internal space,
The exhaust gas introduction part is provided in the lower part of the absorption tower body, and an exhaust gas discharge part is provided in the uppermost part of the absorption tower body, and the exhaust gas introduced from the exhaust gas introduction part swirls in the internal space. configured to rise,
The unevenness is formed on the inner peripheral surface on which the liquid film of the cleaning liquid sprayed from the spray part is formed,
The unevenness is formed along the axial direction of the absorber tower body and includes one or more grooves provided over the entire circumferential direction of the inner peripheral surface when viewed from the axial direction of the absorber tower body. An exhaust gas treatment device characterized by: 2. The exhaust gas treatment apparatus according to claim 1 , further comprising a mist eliminator provided in the inner space above the spray portion, the inner peripheral surface on which the unevenness is formed, and the exhaust gas introduction portion. The exhaust gas introduction section is configured by an exhaust gas introduction pipe connected to the absorption tower body, and the exhaust gas introduction pipe is configured to include a linear straight pipe portion provided at a connection portion with the absorption tower body,
3. The exhaust gas treatment apparatus according to claim 1 , wherein the straight pipe portion has a plurality of second projections dispersedly arranged on the inner peripheral surface of the straight pipe portion. The spray section is
a trunk pipe extending along the central axis of the absorber body in the internal space;
one or more branch pipes extending from the trunk pipe toward the inner peripheral surface;
a spray nozzle for spraying the cleaning liquid supplied from the branch pipe;
The exhaust gas treatment apparatus according to any one of claims 1 to 3 , comprising: The spray part is provided in the inner space above the inner peripheral surface on which the unevenness is formed and the exhaust gas introduction part,
2. The spray part is configured to include a nozzle pipe supplied with the cleaning liquid, extending along the cross section of the absorber body, and having a plurality of nozzles arranged in a dispersed manner. 4. The exhaust gas treatment device according to any one of items 1 to 3 . The second protrusion has a polygonal pyramidal shape, a conical shape, a truncated pyramidal shape, a prismatic shape, a cylindrical shape, a spherical shape, an elliptical shape, a three-dimensional shape having a half-moon cross section, or a three-dimensional shape having a wavy cross section. The exhaust gas treatment apparatus according to claim 3 , characterized by:

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