WO2020095886A1 - Drainage discharging device - Google Patents

Abstract

Provided is a drainage discharging device (1) for discharging drainage generated in an exhaust gas flow path (4) through which there flows an exhaust gas discharged from a reactor (2) that is configured so as to bring the exhaust gas and a cleansing liquid into gas-liquid contact, wherein: the shape of a transverse cross-section of the exhaust gas flow path includes at least a flat ceiling surface (41) or a flat bottom surface (42); and the drainage discharging device is provided with at least one drainage guide (5) provided so as to protrude from the flat ceiling surface and/or the flat bottom surface of the exhaust gas flow path, the at least one drainage guide including at least one obliquely extending part (6) that extends in an oblique direction with respect to the direction in which the exhaust gas flow path extends in a top view.

Description

Drain discharge device

The present disclosure relates to a drain discharge device for discharging drain generated by condensation of water in exhaust gas discharged from a reactor in which exhaust gas and a cleaning liquid are brought into gas-liquid contact with each other.

For example, exhaust gas emitted from a combustion engine such as a boiler contains air pollutants such as SOx (sulfur oxide). As a method for reducing SOx contained in the exhaust gas, there is a wet desulfurization method in which SO _{2 and the} like are removed with a liquid substance such as an alkaline aqueous solution or a slurry containing an alkaline component.

An exhaust gas desulfurization apparatus using the above-described wet desulfurization method includes one that includes an absorption tower (reactor) that internally defines a gas-liquid contact portion that makes gas-liquid contact between exhaust gas and the absorption liquid (cleaning liquid) described above (for example, See Patent Documents 1 and 2. In Patent Documents 1 and 2, the absorption liquid is sprayed on the exhaust gas flowing in the absorption tower, and the exhaust gas and the absorption liquid are brought into contact with each other, whereby the absorption liquid absorbs air pollutants contained in the exhaust gas.

After passing through the gas-liquid contact part, the exhaust gas is close to saturation due to gas-liquid contact and contains a large amount of water. The exhaust gas is discharged from the absorption tower, while flowing through the exhaust gas flow path located on the downstream side in the flow direction of the exhaust gas from the absorption tower, if the temperature of the exhaust gas decreases due to the temperature difference with the outside air, Water may condense and generate drainage (condensed water). As shown in Patent Document 2, even if a mist separator for separating mist (droplets) from the exhaust gas after passing through the gas-liquid contact portion is provided, it is located downstream of the mist separator in the exhaust gas flow direction. The drain may be generated in the exhaust gas passage located.

In Patent Documents 1 and 2, the exhaust gas passage is partitioned by an inner peripheral surface of an exhaust pipe including a cylindrical portion extending in the horizontal direction, and the exhaust gas is discharged to the atmosphere at the tip of the annular portion. An exhaust port that is opened laterally is formed in order to discharge to the inside. Further, in Patent Documents 1 and 2, by providing a weir that is provided so as to project from the exhaust port of the exhaust pipe toward the inside of the exhaust gas flow path, the drain scatters on the downstream side of the weir in the exhaust gas flow direction. It is disclosed to prevent this.

JP, 2007-248015, A Japanese Utility Model Publication No. 63-20919

The present inventors have shown that the cross-sectional shape of the exhaust gas passage is not the annular shape disclosed in Patent Documents 1 and 2, but a flat ceiling surface 101 or bottom surface 102 such as a rectangular annular shape shown in FIG. It has been found that when it contains, the drain blocked by the weir 103 may not be discharged and may be accumulated in front of the weir 103.

For example, if a weir 103 extending in a direction orthogonal to the direction in which the exhaust gas flow passage extends is provided in the rectangular annular exhaust gas flow passage 100 as shown in FIG. 20, it is blocked by the weir 103. Since the drain DW is distributed along the weir 103 along the direction orthogonal to the direction in which the exhaust gas flow channel extends in the upper view, an opening 104 for draining the drain DW is provided in front of the weir 103. However, the drain DW may not be completely discharged and may accumulate in front of the weir 103. The drain DW, which is not discharged and is collected in front of the weir 103, is pushed by the flow of the exhaust gas, crosses the weir 103, and scatters to a device located downstream of the weir 103 in the flow direction of the exhaust gas to corrode the device. May cause

In view of the above-mentioned circumstances, an object of at least one embodiment of the present invention is to improve drain discharge capacity even when the exhaust gas passage includes a flat ceiling surface or bottom surface. It is to provide a drain discharge device.

(1) The drain discharge device according to at least one embodiment of the present invention is
A drain discharge device for discharging the drain generated in the exhaust gas flow path in which the exhaust gas discharged from the reactor configured to bring the exhaust gas and the cleaning liquid into gas-liquid contact,
The cross-sectional shape of the exhaust gas passage includes at least one of a flat ceiling surface or a flat bottom surface,
The drain discharge device is
At least one drain guide portion provided so as to project from at least one of the flat ceiling surface or the flat bottom surface of the exhaust gas passage, and is oblique with respect to the extending direction of the exhaust gas passage when viewed from above. At least one drain guide portion including at least one obliquely extending portion extending in the direction.

According to the configuration of (1) above, the drain discharge device includes at least one drain guide portion provided so as to project from at least one of the flat ceiling surface and the flat bottom surface of the exhaust gas passage. The at least one drain guide part includes at least one oblique extension part that extends obliquely with respect to the direction in which the exhaust gas flow channel extends in a top view. Here, the present inventors utilize that the drain guide portion is provided with an obliquely extending portion, and the drain in the exhaust gas passage is pushed to the downstream side in the exhaust gas flow direction by the exhaust gas flowing through the exhaust gas passage. By doing so, it has been found that the drain attached to the obliquely extended portion can be made to flow to the downstream side of the exhaust gas flow path along the obliquely extended portion, and the drain can be stored in a predetermined place.

According to the above configuration, the drain can be stored in a predetermined place by the obliquely extending portion. Since the drain accumulated in the predetermined place can be easily discharged to the outside of the exhaust gas flow path by the drain discharge flow path or the like, according to the above configuration, the drain discharge capacity can be improved. By improving the drain discharge capacity, it is possible to reduce the amount of drain that accumulates in front of the drain guide, so the drain that accumulates in front of the drain guide is pushed by the flow of exhaust gas, and is more likely to drain than the drain guide. It is possible to prevent the exhaust gas from scattering to the device located on the downstream side in the flow direction. By preventing the drain from scattering, it is possible to prevent corrosion of the above device.

(2) In some embodiments, in the drain discharge device according to (1), the at least one oblique extension portion is the first oblique extension portion and the first oblique extension portion in the top view. A second diagonal extension portion extending in a direction intersecting the direction in which the diagonal extension portion extends at an obtuse angle.

According to the configuration of (2) above, at least one obliquely extending portion includes both the first obliquely extending portion and the second obliquely extending portion. Since the second oblique extension portion extends in a direction intersecting an obtuse angle with respect to the direction in which the first oblique extension portion extends in the upper view, the second oblique extension portion is attached to the second oblique extension portion. The drain can be made to flow in a direction different from that of the first oblique extension. Therefore, the oblique extension portion includes both the first oblique extension portion and the second oblique extension portion, so that the oblique extension portion (first oblique extension portion, first The drain attached to the diagonally extending portion 2) can be dispersed and stored at a plurality of positions. Dispersing drainage at multiple positions reduces the amount of drainage at each of the above multiple positions, making it more reliable that the drain will scatter downstream of the drain guide in the exhaust gas flow direction. Can be prevented.

(3) In some embodiments, in the drain discharge device according to (1) or (2), the at least one drain guide portion is more than the first drain guide portion and the first drain guide portion. A second drain guide portion provided on the downstream side of the exhaust gas passage.

According to the configuration of (3) above, at least one drain guide part includes a first drain guide part and a second drain guide part. Since the second drain guide part is provided on the downstream side of the exhaust gas passage with respect to the first drain guide part, the drain can be accumulated stepwise in the middle of the exhaust gas passage by the first drain guide part and the second drain guide part. You can By collecting the drain stepwise in the middle of the exhaust gas flow path, it is possible to prevent the drain from flowing to the downstream side in the exhaust gas flow path, and to collect it in the second drain guide part provided on the downstream side in the exhaust gas flow path. The amount of drained can be reduced. By reducing the amount of drain accumulated in the second drain guide portion, it is possible to prevent the drain from scattering to the downstream side in the exhaust gas flow direction with respect to the second drain guide portion.

(4) In some embodiments, in the drain discharge device according to (3), at least one of the first drain guide portion and the second drain guide portion has a flow passage area of the exhaust gas flow passage. It will be provided at the turn.

At the transition of the flow passage area of the exhaust gas passage, the drain attached to the wall surface of the exhaust gas passage is easily scattered. According to the configuration of (4) above, by providing at least one of the first drain guide portion and the second drain guide portion at the transition of the flow passage area of the exhaust gas passage, the drain attached to the wall surface of the exhaust gas passage is prevented. It is possible to prevent the scattering, and consequently to prevent the corrosion of the device located downstream of the drain guide in the flow direction of the exhaust gas.

(5) In some embodiments, in the drain discharge device according to any one of (1) to (4), the exhaust gas flow passage has a cross-sectional shape including at least one flat side surface. The exhaust device is at least one side drain guide portion provided so as to project from the at least one flat side surface of the exhaust gas passage, and is oblique to a direction in which the exhaust gas passage extends in a side view. Further, at least one side drain guide portion including a sideward oblique extension portion that extends in the direction and that is positioned on the downstream side of the exhaust gas flow path below the upper side is further provided.

According to the configuration of (5) above, the drain discharge device includes at least one side drain guide part. At least one lateral drain guide portion includes the lateral oblique extension portion. According to the above configuration, it is possible to block the drain flowing along the side surface of the exhaust gas flow passage to the downstream side of the exhaust gas flow passage by the side drain guide portion. In addition, the laterally-obliquely extending portion pushes the drain attached to the laterally-obliquely extending portion to the downstream side by the exhaust gas flowing through the exhaust gas passage, and causes the drain to flow downward along the laterally-oblique extending portion. Since it can be done, the drain can be stored in a predetermined place.

(6) In some embodiments, in the drain discharge device according to (5) above, the at least one side drain guide part is located on the upstream side of the exhaust gas flow passage in the at least one flat side surface. From the left side drain guide portion provided to protrude from the left side surface located on the left side, and from the right side surface located on the right side when viewed from the upstream side of the exhaust gas flow path among the at least one flat side surface. And a right drain guide portion provided so as to project.

According to the configuration of (6) above, at least one side drain guide part includes a left drain guide part and a right drain guide part. The left drain guide part can block the drain flowing down the left side of the exhaust gas flow path to the downstream side of the exhaust gas flow path, and the right drain guide part travels along the right side surface of the exhaust gas flow path. Drain flowing downstream of the road can be blocked.

(7) In some embodiments, in the drain discharge device according to (5) or (6), the at least one drain guide portion is an upper drain guide provided so as to project downward from the flat ceiling surface. And a lower drain guide portion provided so as to project upward from the flat bottom surface, and the at least one side drain guide portion is the upper drain when viewed from the upstream side of the exhaust gas passage. The guide portion and the lower drain guide portion are arranged so as to be continuous with each other.

According to the above configuration (7), the at least one drain guide part includes an upper drain guide part provided so as to project downward from the flat ceiling surface, and a lower drain guide part provided so as to project upward from the flat bottom surface. ,including. The upper drain guide part can block the drain flowing along the ceiling surface of the exhaust gas flow path to the downstream side of the exhaust gas flow path, and the lower drain guide part travels along the bottom surface of the exhaust gas flow path to the downstream side of the exhaust gas flow path. Drain flowing to the side can be blocked.

Also, at least one side drain guide section is arranged so as to be continuous with each of the upper drain guide section and the lower drain guide section when viewed from the upstream side of the exhaust gas flow path. According to the above configuration, the drain flowing along the obliquely extending portion of the upper drain guide portion can be sent to the lateral obliquely extending portion, and can be sent downward through the lateral obliquely extending portion. it can. Further, the drain sent downward along the laterally extending portion can be combined with the drain flowing along the obliquely extending portion of the lower drain guide portion.

(8) In some embodiments, in the drain discharge device according to any one of (5) to (7), the at least one side drain guide portion is located at a tip of the side drain guide portion. It is provided with a lateral drain receiving portion that projects toward the upstream side of the exhaust gas passage.

According to the configuration of (8) above, since the side drain guide portion is provided with the side drain receiving portion, the drain attached to the side surface of the side drain guide portion or the exhaust gas flow path does not contact the tip of the side drain guide portion. It is possible to prevent it from flying over.

(9) In some embodiments, in the drain discharge device according to any one of (1) to (8), the at least one drain guide part is provided with a portion of the exhaust gas passage from a tip of the drain guide part. The drain receiving portion protruding toward the upstream side is provided.

According to the configuration of the above (9), since the drain guide part includes the drain receiving part, the drain attached to the drain guide part and the ceiling surface and the bottom surface of the exhaust gas flow path is scattered over the tip of the drain guide part. Can be prevented.

(10) In some embodiments, the drain discharge device according to any one of (1) to (9) above includes at least one drain for storing the drain collected by the at least one drain guide unit. A storage part and a drain discharge passage for discharging the drain stored in the at least one drain storage part are further provided.

According to the above configuration (10), the drain collected by the drain guide section can be stored in the drain storage section, and the drain stored in the drain storage section by the drain discharge channel can be discharged to the outside of the exhaust gas flow channel. You can Therefore, according to the above configuration, the amount of drain accumulated in front of the drain guide portion can be reduced, and thus the drain can be prevented from scattering downstream of the drain guide portion in the exhaust gas flow direction. ..

(11) In some embodiments, in the drain discharge device according to (10) above, the at least one drain storage section has an internal space for storing the drain, and the drain exhaust passage and the exhaust gas flow path are connected to each other. Includes a drain storage basin configured to receive drain.

According to the configuration of (11) above, since the drain can be stored in the drain storage container having the internal space, the liquid level of the drain in the reservoir portion of the exhaust gas flow passage exceeds the drain guide portion, and the drain guides the drain. It is possible to prevent the exhaust gas from flowing downstream in the flow direction.

(12) In some embodiments, in the drain discharge device according to (10) or (11), the drain discharge flow path is a supply flow path of the cleaning liquid to the reactor, or the drain flow path of the reactor. A first connection part which is connected to either one and in which a first drain introduction port for introducing the drain flowing through the drain discharge passage into the supply passage or the reactor is formed. Including parts.

According to the configuration of (12) above, the first connecting portion is connected to the supply channel or the reactor of the cleaning liquid to the reactor, and the drain flowing through the drain discharge channel is connected to the supply channel or the reactor. A first drain introduction port for introduction is formed. The drain flowing through the drain discharge passage can be reused as a cleaning liquid because it is introduced into the supply passage and the reactor via the first connecting portion. Further, since the supply flow passage of the cleaning liquid to the reactor and the reactor are located in the vicinity of the exhaust gas flow passage, the drain discharge flow passage including the first connecting portion can be shortened.

(13) In some embodiments, in the drain discharge device according to (10) or (11), the drain discharge passage is located downstream of the drain discharge device in the flow direction of the exhaust gas. A second connection part connected to the drain flow path of the apparatus, wherein the second connection part is formed with a second drain introduction port for introducing the drain flowing through the drain discharge flow path into the drain flow path. Including.

According to the configuration of (13) above, the second connecting portion is connected to the drain flow path of the device located downstream of the drain discharge device in the flow direction of the exhaust gas, and the drain flowing through the drain discharge flow path is connected to the drain flow path of the device. A second drain introduction port for introducing into the drain passage of the above device is formed. The drain flowing through the drain discharge passage is introduced into the drain passage for discharging the drain of the above device through the second connecting portion. Since the device and the drain passage are located in the vicinity of the exhaust gas passage, the drain discharge passage including the second connecting portion can be shortened.

(14) In some embodiments, in the drain discharge device according to any of (10) to (13), the at least one drain storage unit includes a first drain storage unit and the first drain storage unit. A second drain storage part provided on the downstream side of the exhaust gas flow path with respect to the first drain storage part, and the drain discharge flow path includes a first drain for discharging the drain stored in the first drain storage part. A discharge flow channel, a second drain discharge flow channel for discharging the drain stored in the second drain storage section, the first drain discharge flow channel and the second drain discharge flow in the flow direction of the drain. A third drain discharge passage provided on the downstream side of each of the passages.

According to the configuration of (14) above, the drain discharge flow path includes a first drain discharge flow path for discharging the drain stored in the first drain storage section and an exhaust gas flow path more than the first drain storage section. And a second drain discharge flow path for discharging the drain stored in the second drain storage section provided on the downstream side, so that the drain is discharged from both the first drain storage section and the second drain storage section. be able to. Further, the drain discharge passage further includes a third drain discharge passage provided on the downstream side of each of the first drain discharge passage and the second drain discharge passage. In other words, the third drain discharge passage can be simplified in structure by integrating the downstream sides of the first drain discharge passage and the second drain discharge passage, thereby simplifying the configuration of the drain discharge passage. Can be improved. Further, by simplifying the configuration of the drain discharge passage, the layout of the drain discharge passage can be improved, and the amount of piping required for the drain discharge passage can be reduced.

(15) In some embodiments, in the drain discharge device according to any one of the above (1) to (14), the at least one obliquely extending portion extends from the exhaust gas passage in a top view. The inclination angle θ is within 10 ° ± 5 °, where θ is the inclination angle with respect to the direction orthogonal to the direction.

According to the above configuration (15), since the inclination angle θ of at least one of the oblique extending portions is within 10 ° ± 5 °, the drain attached to the oblique extending portions can be efficiently removed. Can be run downstream.

According to at least one embodiment of the present invention, there is provided a drain discharge device capable of improving the drain discharge capacity even when the exhaust gas flow passage includes a flat ceiling surface or bottom surface. ..

It is a schematic structure figure showing roughly composition of an exhaust gas desulfurization system provided with an exhaust gas channel in which a drain discharge device concerning one embodiment is provided. FIG. 2 is a partially enlarged view showing the vicinity of an exhaust gas passage shown in FIG. 1 in an enlarged manner. It is a side sectional view of an exhaust gas channel in one embodiment. It is a schematic cross-sectional view which shows the cross section of the exhaust gas flow path in one embodiment roughly. It is a figure which shows the state which looked at the exhaust gas flow path shown in FIG. 4 from the A direction, and removes the upper wall part containing a ceiling surface. It is a figure corresponding to the state which looked at the exhaust gas flow path shown in Drawing 4 from the A direction, and removed the upper wall part containing a ceiling surface, and is a figure showing the modification of a drain guide part. It is a figure corresponding to the state which looked at the exhaust gas flow path shown in Drawing 4 from the A direction, and removed the upper wall part containing a ceiling surface, and is a figure showing the modification of a drain guide part. It is a schematic cross-sectional view which shows the cross section of the exhaust gas flow path in one embodiment roughly. FIG. 9 is an end view of the exhaust gas passage and the drain guide portion shown in FIG. 8 taken along the line BB. FIG. 9 is a view corresponding to an end view of the exhaust gas flow path and the drain guide section shown in FIG. 8 taken along the line BB, showing a modified example of the drain guide section. It is a schematic cross-sectional view which shows the cross section of the exhaust gas flow path in one embodiment roughly. FIG. 12 is a cross-sectional view of the exhaust gas passage, the drain guide portion, and the lateral drain guide portion shown in FIG. 11, taken along the line CC. FIG. 13 is an end view of the exhaust gas passage and the side drain guide portion shown in FIG. 12, taken along the line DD. FIG. 13 is a view corresponding to an end view of the exhaust gas flow path and the side drain guide section taken along the line DD of FIG. 12, showing a modified example of the side drain guide section. FIG. 3 is an enlarged transverse cross-sectional view showing the vicinity of a portion of the exhaust gas passage where a lower drain guide portion is provided in one embodiment. FIG. 5 is a diagram corresponding to a state in which the exhaust gas passage shown in FIG. 4 is viewed from the direction A and a state in which an upper wall portion including a ceiling surface is removed, and is a diagram for explaining a drain discharge passage. It is a figure which expands and shows the vicinity of the exhaust gas flow path shown in FIG. 1, and is a figure for demonstrating the drain discharge flow path in one Embodiment. It is a figure which expands and shows the vicinity of the exhaust gas flow path shown in FIG. 1, and is a figure for demonstrating the drain discharge flow path in one Embodiment. It is a schematic cross-sectional view which shows the cross section of the exhaust gas flow path concerning a comparative example schematically. It is a figure which shows the state which looked at the exhaust gas flow path shown in FIG. 19 from the E direction.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. Absent.
For example, the expressions representing relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" are strict. In addition to representing such an arrangement, it also represents a state of relative displacement, or a state of relative displacement with an angle or distance such that the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous" that indicate that they are in the same state are not limited to a state in which they are exactly equal to each other. It also represents the existing state.
For example, the representation of a shape such as a quadrangle or a cylindrical shape does not only represent a shape such as a quadrangle or a cylindrical shape in a geometrically strict sense, but also an uneven portion or a chamfer within a range in which the same effect can be obtained. The shape including parts and the like is also shown.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one element are not exclusive expressions excluding the existence of other elements.
Note that the same configurations are denoted by the same reference numerals, and description thereof may be omitted.

FIG. 1 is a schematic configuration diagram schematically showing a configuration of an exhaust gas desulfurization system including an exhaust gas flow path provided with a drain discharge device according to an embodiment. FIG. 2 is a partially enlarged view showing the vicinity of the exhaust gas passage shown in FIG. 1 in an enlarged manner. The drain discharge device 1 is provided in the exhaust gas discharge line 17 (first exhaust gas discharge line 17A) as shown in FIGS. First, an exhaust gas purification system 10 including an exhaust gas exhaust line 17 (first exhaust gas exhaust line 17A) will be described with reference to FIGS.

As shown in FIG. 1, the exhaust gas purification system 10 sends a combustion device 11, an absorption tower 2 (reactor), a stack 16 (exhaust device), and exhaust gas discharged from the combustion device 11 to the absorption tower 2. An exhaust gas introduction line 12, an exhaust gas exhaust line 17 for sending the exhaust gas exhausted from the absorption tower 2 to the chimney 16, and a device 18 provided in the exhaust gas exhaust line 17. The exhaust gas generated by the combustion in the combustion device 11 is sent to the absorption tower 2 through the exhaust gas introduction line 12. The exhaust gas purified by the absorption tower 2 is sent to the chimney 16 through the exhaust gas discharge line 17, and is discharged from the chimney 16 into the atmosphere. Examples of the combustion device 11 include an engine such as a diesel engine, a gas turbine engine or a steam turbine engine, and a boiler.

In the illustrated embodiment, as shown in FIG. 1, the exhaust gas purification system 10 includes a dust collector 13 configured to collect soot and dust contained in the exhaust gas discharged from the combustion device 11, and an exhaust gas introduction line. An induction fan 14 configured to send the exhaust gas to the downstream side of 12 and a heat recovery device 15 configured to recover heat from the exhaust gas flowing through the exhaust gas introduction line 12. Each of the dust collector 13, the induction fan 14, and the heat recovery device 15 is provided in the exhaust gas introduction line 12. Further, in the illustrated embodiment, the device 18 includes a heating device 18A configured to heat the exhaust gas flowing through the exhaust gas discharge line 17 by the heat recovered by the heat recovery device 15. The upstream side of the device 18 of the exhaust gas discharge line 17 is a first exhaust gas discharge line 17A, and the downstream side of the device 18 of the exhaust gas discharge line 17 is a second exhaust gas discharge line 17B.

The absorption tower 2 is configured to bring the cleaning liquid into gas-liquid contact with the exhaust gas introduced therein. In the illustrated embodiment, the absorption tower 2 is configured to bring the exhaust gas and the cleaning liquid into gas-liquid contact by spraying the cleaning liquid onto the exhaust gas introduced therein, as shown in FIGS. A gas-liquid contact portion 21A and a liquid pool portion 21B located below the gas-liquid contact portion 21A and storing the cleaning liquid that has absorbed SOx in the exhaust gas at the gas-liquid contact portion 21A are configured to be defined therein. To be done. Here, examples of the cleaning liquid include a liquid containing an alkaline agent and seawater. Further, examples of the alkaline agent include NaOH, Ca (OH) ₂ , NaHCO ₃ , Na ₂ CO ₃ , and CaCO ₃ .

In the embodiment shown in FIG. 2, the absorption tower 2 includes an absorption tower main body portion 22 that internally defines an internal space 21 including the gas-liquid contact portion 21A and the liquid pool portion 21B described above, and the absorption tower main body portion 22. An exhaust gas introducing portion 23 for introducing the exhaust gas into the exhaust gas and an exhaust gas discharging portion 24 for discharging the exhaust gas from the absorption tower body portion 22 are provided. The direction in which the absorption tower body 22 and the exhaust gas introducing portion 23 are adjacent to each other is defined as a first direction, the exhaust gas introducing portion 23 side in the first direction is one side, and the exhaust gas discharging portion 24 side in the first direction is the other side.

As shown in FIG. 2, the exhaust gas inlet port 251 communicating with the internal space 21 (the lower internal space 21C) is provided in the first side wall 25 which is the one side wall of the absorption tower main body 22 in the first direction. Has been formed. The second side wall 26, which is the other side wall in the first direction of the absorption tower body 22, has an exhaust gas outlet communicating with the internal space 21 (upper internal space 21D) at a position higher than the exhaust gas inlet 251. 261 is formed. Each of the first side wall 25 and the second side wall 26 extends along a second direction orthogonal to the first direction in a top view and defines at least a part of the internal space 21 including the liquid reservoir 21B. There is.

Exhaust gas introduced from the exhaust gas introduction line 12 into the exhaust gas introduction section 23 is introduced into the internal space 21 (lower internal space 21C) via the exhaust gas introduction port 251 after passing through the exhaust gas introduction section 23. The exhaust gas introduced into the internal space 21 flows in the lower internal space 21C from the first side wall 25 located on one side toward the second side wall 26 located on the other side, and then rises vertically in the internal space 21. While flowing. The exhaust gas that has risen to the upper internal space 21D flows from the first side wall 25 toward the second side wall 26, and then is discharged to the exhaust gas discharge portion 24 via the exhaust gas discharge port 261.

As shown in FIG. 2, in the gas-liquid contact portion 21A located above the lower internal space 21C of the absorption tower body 22 and below the upper internal space 21D, the internal space 21 is described above. A spraying device 28 for spraying the cleaning liquid is arranged. The spraying device 28 sprays the cleaning liquid onto the exhaust gas passing through the gas-liquid contact portion 21A, and brings the cleaning liquid into contact with the cleaning liquid so as to absorb and remove pollutants such as SOx contained in the exhaust gas. Composed.

As shown in FIG. 2, the spraying device 28 includes a water spray pipe 281 extending along the first direction in the internal space 21 of the absorption tower body 22, and a plurality of spray nozzles 282 provided in the water spray pipe 281. And, including. The spray nozzle 282 is configured to spray the cleaning liquid toward the downstream side in the flow direction of the exhaust gas, that is, toward the upper side in the vertical direction. In the illustrated embodiment, the spray nozzle 282 is adapted to spray the cleaning liquid in a liquid column shape. That is, the illustrated absorption tower 2 is a liquid column type absorption tower.

The absorption tower 2 is not limited to the liquid column type described above as long as it is configured to bring the cleaning liquid into gas-liquid contact with the exhaust gas introduced therein. For example, the absorption tower 2 is a grid-type absorption tower that includes a packed bed that is filled with a filler for promoting gas-liquid contact in the internal space 21, or a spray-type absorption tower that includes a spray nozzle 282 that sprays the cleaning liquid radially. It may be an absorption tower or the like. Further, the water sprinkler 281 may extend along a direction orthogonal to the first direction in a top view. Further, the spray nozzle 282 may be configured to spray the cleaning liquid downward in the vertical direction.

Exhaust gas that has passed through the gas-liquid contact portion 21A contains a large amount of water. A mist eliminator 27 is arranged downstream of the gas-liquid contact portion 21A in the flow direction of the exhaust gas. The mist eliminator 27 is configured to remove water from the exhaust gas passing through the mist eliminator 27. The exhaust gas that has passed through the mist eliminator 27 is discharged to the outside of the absorption tower 2.

In the illustrated embodiment, the mist eliminator 27 is arranged in the exhaust gas discharge part 24 and extends along the vertical direction so as to separate the upstream side and the downstream side in the exhaust gas flow direction in the exhaust gas discharge part 24. There is. Note that the mist eliminator 27 may be arranged in the upper internal space 21D and extend along the horizontal direction. Further, the mist eliminator 27 may have a multi-stage configuration.

The liquid reservoir 21B is configured to store the sprayed cleaning liquid that has been sprayed with respect to the exhaust gas guided to the internal space 21. In the illustrated embodiment, the liquid reservoir 21B is provided such that the liquid surface is located below the lower internal space 21C and at a position lower than the exhaust gas inlet 251. As shown in FIG. 2, the second side wall 26 has a cleaning liquid discharge port 262 for discharging the cleaning liquid stored in the liquid pool 21B to the outside at a position near the bottom surface 211 of the liquid pool 21B in the vertical direction. Is open. The cleaning liquid discharge port 262 communicates with the liquid reservoir 21B.

In the illustrated embodiment, the absorption tower 2 is provided with a cleaning liquid circulation line 3 configured to send the cleaning liquid stored in the liquid reservoir 21B to the spraying device 28, as shown in FIG. The cleaning liquid circulation line 3 sends the cleaning liquid to the water spray pipe 281 from the cleaning liquid discharge port 262 and the at least one pipe 31 that connects the above-described cleaning liquid discharge port 262 and the above-mentioned water spray pipe 281 and the cleaning liquid discharge port 262 provided in the middle of the cleaning liquid circulation line 3. And a cleaning liquid circulation pump 32 for. That is, at least a part of the cleaning liquid sprayed from the spraying device 28 and stored in the liquid pool 21 </ b> B is pressure-fed by the cleaning liquid circulating pump 32, passes through the cleaning liquid circulating line 3, and is sent to the spraying device 28.

The above-mentioned exhaust gas discharge line 17 (first exhaust gas discharge line 17A) is located on the downstream side of the absorption tower 2 (of the exhaust gas discharge portion 24) and the absorption tower 2 in the exhaust gas flow direction, as shown in FIG. The device 18 (heating device 18A) is connected to the exhaust gas flow path 4. The exhaust gas discharged from the absorption tower 2 is introduced into the device 18 after passing through the exhaust gas passage 4.

FIG. 3 is a lateral cross-sectional view of the exhaust gas passage according to the embodiment. FIG. 4 is a schematic cross-sectional view schematically showing the cross-section of the exhaust gas passage according to the embodiment. FIG. 5 is a diagram showing a state of the exhaust gas passage shown in FIG. 4 viewed from the direction A and a state in which the upper wall portion including the ceiling surface is removed. FIG. 6 and FIG. 7 are views corresponding to a state in which the exhaust gas flow passage shown in FIG. 4 is viewed from the direction A and a state in which the upper wall portion including the ceiling surface is removed, and show a modification of the drain guide portion. It is a figure.

In the illustrated embodiment, as shown in FIG. 3, the exhaust gas flow channel 4 includes a first exhaust gas flow channel 4A and a second exhaust gas flow channel 4B located downstream of the first exhaust gas flow channel 4A. And a third exhaust gas passage 4C located on the downstream side of the second exhaust gas passage 4B. Each of the first exhaust gas passage 4A and the third exhaust gas passage 4C extends in the horizontal direction, and the third exhaust gas passage 4C is located below the first exhaust gas passage 4A. .. The second exhaust gas flow passage 4B has an upstream end connected to the downstream end of the first exhaust gas flow passage 4A and a downstream end connected to the upstream end of the third exhaust gas flow passage 4C, and the downstream side is inclined downward from the upstream side. ing. Generally, since the device 18 is arranged below the exhaust gas discharge part 24 of the absorption tower 2, the exhaust gas flow path 4 has a shape as illustrated, but is not limited to the shape illustrated. is not.

As shown in FIG. 3, the exhaust gas flowing through the exhaust gas flow path 4 flows along the axis CL (CL1 to CL3) of the exhaust gas flow path 4 from the upstream side to the downstream side in the flow direction of the exhaust gas. Hereinafter, the upstream side in the exhaust gas flow direction may be abbreviated as the upstream side, and the downstream side in the exhaust gas flow direction may be abbreviated as the downstream side. The left side and the right side mean the directions when viewed from the upstream side in the flow direction of the exhaust gas.

The cross-sectional shape of the exhaust gas passage 4 includes at least one of a flat ceiling surface 41 and a flat bottom surface 42, as shown in FIG. In the illustrated embodiment, the cross-sectional shape of the exhaust gas passage 4 is, as shown in FIG. 4, a flat ceiling surface 41, a flat bottom surface 42, a flat left side surface 44 (side surface 43), and a flat surface. And a right side surface 45 (side surface 43).

The drain discharge device 1 is a device for discharging the drain generated in the above-mentioned exhaust gas passage 4 through which the exhaust gas discharged from the absorption tower 2 flows.

As shown in FIGS. 3 and 4, the drain discharge device 1 according to some embodiments includes at least one of the flat ceiling surface 41 and the flat bottom surface 42 of the exhaust gas passage 4, which are provided so as to project therefrom. Two drain guide parts 5 are provided. The at least one drain guide part 5 is, for example, as shown in FIGS. 5 to 7, at least one drain guide part 5 extending obliquely with respect to a direction in which the exhaust gas flow path 4 extends (exhaust gas flow direction) when viewed from above. An oblique extension 6 is included. Here, the oblique direction does not include a direction orthogonal to the extending direction of the exhaust gas flow path 4 when viewed from above.

In the illustrated embodiment, the drain guide portion 5 is a separate body from the exhaust gas passage 4 and is attached to the exhaust gas passage 4, as shown in FIG. 3. Further, in the illustrated embodiment, the drain guide portion 5 is provided with an upper drain guide portion 51 provided so as to project downward from the flat ceiling surface 41 and an upward drain portion provided with a flat bottom surface 42, as shown in FIG. 4. And a lower drain guide portion 52 that is provided as a component.

The inventors of the present invention provide the drain guide portion 5 with an obliquely extending portion 6 and prevent the drain in the exhaust gas passage 4 from being pushed to the downstream side in the exhaust gas flow direction by the exhaust gas flowing through the exhaust gas passage 4. It has been found that by utilizing the drain, the drain attached to the obliquely extending portion 6 can be made to flow to the downstream side of the exhaust gas flow path 4 along the obliquely extending portion 6, and the drain can be stored at a predetermined location. It was

Below, an explanation is given using FIG. 6 as an example. In the embodiment shown in FIG. 6, each of the upper drain guide portion 51 and the lower drain guide portion 52 has one second diagonal extension that is inclined so that the right side is located on the downstream side of the left side in a top view. The existing portion 6B (obliquely extending portion 6) is included. The second oblique extension 6B in FIG. 6 has an upstream end in contact with the left side surface 44 and a downstream end in contact with the right side surface 45. In this case, the drain adhering to the ceiling surface 41 on the upstream side of the upper drain guide part 51 is pushed by the flow of the exhaust gas flowing through the exhaust gas flow path 4 and flows to the upper drain guide part 51. The drain attached to the upper drain guide portion 51 is pushed by the flow of the exhaust gas flowing through the exhaust gas passage 4 and flows to the right, which is the downstream side of the exhaust gas passage 4, along the second oblique extension 6B. Similarly, the drain attached to the bottom surface 42 on the upstream side of the lower drain guide part 52 is pushed by the flow of the exhaust gas flowing through the exhaust gas flow path 4 and flows to the lower drain guide part 52. The drain attached to the lower drain guide portion 52 is pushed by the flow of the exhaust gas flowing through the exhaust gas passage 4 and flows to the right, which is the downstream side of the exhaust gas passage 4, along the second oblique extension 6B. Therefore, the drain attached to the upper drain guide portion 51 and the lower drain guide portion 52 can be stored in a predetermined place. In the embodiment shown in FIG. 6, the drain is collected in the corner portion of the lower drain guide portion 52 defined by the downstream end of the second oblique extension 6B of the lower drain guide portion 52, the right side surface 45 and the bottom surface 42. As a result, there is a pool 46 in which drain is stored.

According to the above configuration, the drain can be stored in a predetermined place by the obliquely extending portion 6. Since the drain accumulated in a predetermined place can be easily discharged to the outside of the exhaust gas flow path 4 by the drain discharge flow path 9 and the like described later, according to the above configuration, the drain discharge capacity can be improved. You can By improving the drain discharge capacity, the amount of drain accumulated in front of the drain guide section 5 can be reduced, so that the drain accumulated in front of the drain guide section 5 is pushed by the flow of exhaust gas, and the drain guide section 5 It is possible to prevent scattering to the device 18 located on the downstream side in the flow direction of the exhaust gas. By preventing the drain from scattering, it is possible to prevent the device 18 from being corroded.

In some embodiments, the above-mentioned at least one oblique extension 6 is the first oblique extension 6A (first oblique extension) and the first oblique extension in a top view. And a second oblique extension portion 6B extending in a direction intersecting the direction in which 6A extends at an obtuse angle.

In the embodiment shown in FIGS. 4 and 5, each of the upper drain guide portion 51 and the lower drain guide portion 52 is one first slope that is inclined so that the left side is located on the downstream side than the right side in a top view. 6A (obliquely extending portion 6) and one second obliquely extending portion 6B (obliquely extending portion) that is inclined so that the right side is located on the downstream side of the left side in a top view. 6) and are included. As described with reference to FIG. 6, the second diagonal extension 6B allows the drain to flow to the right, whereas the first diagonal extension 6A allows the drain to flow to the left. There is. Further, in the embodiment shown in FIGS. 4 and 5, the upstream end of the first oblique extension 6A and the upstream end of the second oblique extension 6B are connected.

Further, in the embodiment shown in FIG. 7, each of the upper drain guide portion 51 and the lower drain guide portion 52 has a plurality of the above-described first oblique extension portions 6A and a plurality of the above-described second oblique extension portions. And a section 6B. In the embodiment shown in FIG. 7, the upstream end of at least one first oblique extension 6A and the upstream end of at least one second oblique extension 6B are connected. Further, the downstream end of at least one first oblique extension 6A and the downstream end of at least one second oblique extension 6B are connected.

According to the above configuration, at least one oblique extension 6 includes both the first oblique extension 6A and the second oblique extension 6B. Since the second diagonal extension 6B extends in a direction intersecting the direction in which the first diagonal extension 6A extends in an obtuse angle when viewed from above, the second diagonal extension 6B is attached to the second diagonal extension 6B. The drain can be made to flow in a direction different from that of the first obliquely extending portion 6A (left-right opposite direction). Therefore, the oblique extension 6 includes both the first oblique extension 6A and the second oblique extension 6B, so that the oblique extension 6 (the first oblique extension 6A, The drain attached to the second oblique extension 6B) can be dispersed and accumulated at a plurality of positions (reservoir 46). Since the amount of drain at each of the plurality of positions can be reduced by dispersing and storing the drain at a plurality of positions, it is possible to prevent the drain from scattering to the downstream side in the exhaust gas flow direction with respect to the drain guide portion 5. It can be surely prevented.

In some embodiments, as shown in FIG. 3, the drain guide part 5 described above is provided on the first drain guide part 5A and on the downstream side of the exhaust gas flow path 4 with respect to the first drain guide part 5A. 2 Drain guide part 5B is included. Each of the first drain guide portion 5A and the second drain guide portion 5B includes at least one of the above-mentioned upper drain guide portion 51 and the above-mentioned lower drain guide portion 52.

In the illustrated embodiment, the first drain guide portion 5A includes an upper drain guide portion 51 (51A) and a lower drain guide portion 52 (52A). The second drain guide portion 5B includes an upper drain guide portion 51 (51B) and a lower drain guide portion 52 (52B). The lower drain guide portion 52A is preferably provided on the downstream side of the exhaust gas passage 4 with respect to the upper drain guide portion 51A in order to collect the drain dropped from the upper drain guide portion 51A. For the same reason, it is preferable that the lower drain guide portion 52B be provided on the downstream side of the exhaust gas passage 4 with respect to the upper drain guide portion 51B.

According to the above configuration, at least one drain guide part 5 includes a first drain guide part 5A and a second drain guide part 5B. Since the second drain guide portion 5B is provided on the downstream side of the exhaust gas flow passage 4 with respect to the first drain guide portion 5A, the first drain guide portion 5A and the second drain guide portion 5B are provided in the middle of the exhaust gas flow passage 4. Drainage can be collected. By collecting the drain in a stepwise manner in the exhaust gas flow path 4, the drain can be prevented from flowing to the downstream side in the exhaust gas flow path 4, and the second drain guide provided in the downstream side in the exhaust gas flow path 4 can be prevented. The amount of drain accumulated in the portion 5B can be reduced. By reducing the amount of drain accumulated in the second drain guide portion 5B, it is possible to prevent the drain from scattering downstream of the second drain guide portion 5B in the exhaust gas flow direction.

In some embodiments, as shown in FIG. 3, at least one of the first drain guide portion 5A and the second drain guide portion 5B described above is provided at a transition area of the exhaust gas passage 4. In the illustrated embodiment, as shown in FIG. 3, at the transition of the flow passage area of the exhaust gas flow passage 4, the downstream end of the first exhaust gas flow passage 4A and the upstream end of the second exhaust gas flow passage 4B are connected. The first transition point CP1 which is a portion to be connected, and the second transition point CP2 which is a portion where the downstream end of the second exhaust gas passage 4B and the upstream end of the third exhaust gas passage 4C are connected. If the drain guide portion 5 is not provided at the first transition CP1, the drain attached to the bottom surface 42 of the first exhaust gas flow path 4A may be scattered to the downstream side. Further, if the drain guide portion 5 is not provided at the second transition CP2, the drain attached to the ceiling surface 41 of the second exhaust gas passage 4B may be scattered to the downstream side. In the illustrated embodiment, a first drain guide portion 5A is provided at the first transition CP1 and a second drain guide portion 5B is provided at the second transition CP2.

At the transition of the flow passage area of the exhaust gas passage 4 (CP1, CP2, etc.), the drain attached to the wall surface (ceiling surface 41, etc.) of the exhaust gas passage 4 is easily scattered. According to the above configuration, by providing at least one of the first drain guide portion 5A and the second drain guide portion 5B at the transition of the flow passage area of the exhaust gas passage 4, the drain attached to the wall surface of the exhaust gas passage 4 Can be prevented, and by extension, corrosion of the device 18 located downstream of the drain guide portion 5 in the exhaust gas flow direction can be prevented.

In some embodiments, as shown in FIGS. 5-7, the at least one oblique extension 6 (first oblique extension 6A, second oblique extension 6B) described above is When the angle of inclination with respect to the direction orthogonal to the extending direction of the exhaust gas passage 4 is θ, the angle of inclination θ is within 10 ° ± 5 °. In this case, since the inclination angle θ of at least one oblique extension 6 is within 10 ° ± 5 °, the drain attached to the oblique extension 6 can be efficiently moved along the oblique extension 6. Can be made to flow downstream.

FIG. 8 is a schematic cross-sectional view schematically showing the cross-section of the exhaust gas passage according to the embodiment. 9 is an end view of the exhaust gas passage and the drain guide portion shown in FIG. 8 taken along the line BB. FIG. 10 is a view corresponding to an end view of the exhaust gas passage and the drain guide portion shown in FIG. 8 taken along the line BB, showing a modified example of the drain guide portion.

In some embodiments, as shown in FIGS. 8 to 10, the at least one drain guide portion 5 described above is a drain receiving portion that protrudes from the tip of the drain guide portion 5 toward the upstream side of the exhaust gas flow path 4. And 512 and 522.

In the embodiment shown in FIGS. 8 and 9, the lower drain guide part 52 includes a vertical part 521 extending upward from the bottom surface 42 in the vertical direction, and an upper end of the vertical part 521 to an upstream side of the exhaust gas passage 4. And a drain receiving portion 522 protruding toward the side. The upper drain guide part 51 includes a vertical part 511 extending downward from the ceiling surface 41 in the vertical direction, and a drain receiver projecting from a lower end of the vertical part 511 toward an upstream side of the exhaust gas passage 4. And a portion 512.

In the embodiment shown in FIG. 10, the lower drain guide portion 52 has the above-described vertical portion 521, the above-mentioned drain receiving portion 522, and the lower end of the vertical portion 521 along the bottom surface 42 so as to be upstream of the exhaust gas passage 4. And a protruding portion 523 protruding toward the side. Similarly, the upper drain guide portion 51 may include a protrusion that protrudes from the upper end of the vertical portion 511 along the ceiling surface 41 toward the upstream side of the exhaust gas passage 4. In these cases, since the area in contact with the ceiling surface 41 and the bottom surface 42 can be increased, the installation work of the drain guide portion 5 can be performed quickly.

According to the above configuration, the drain guide part 5 includes the drain receiving parts 512 and 522. Therefore, the drain attached to the drain guide part 5 and the ceiling surface 41 and the bottom surface 42 of the exhaust gas flow path 4 is the tip of the drain guide part 5. It is possible to prevent scattering over.

FIG. 11 is a schematic cross-sectional view schematically showing the cross-section of the exhaust gas passage according to the embodiment. 12 is a cross-sectional view of the exhaust gas passage, the drain guide portion, and the side drain guide portion shown in FIG. 11, taken along the line C-C.

In some embodiments, the drain discharge device 1 described above is provided with at least one side surface 43 (left side surface 44, right side surface 45) protruding from at least one side surface 43 of the exhaust gas passage 4 as shown in FIG. 11. The side drain guide part 7 is further provided. As shown in FIG. 12, at least one side drain guide portion 7 extends obliquely with respect to the direction in which the exhaust gas flow path 4 extends (exhaust gas flow direction) in a side view, and The lower part includes a lateral oblique extension 711 located on the downstream side of the exhaust gas flow path 4 than the upper part. In the illustrated embodiment, the lateral oblique extension 711 has an inclination angle θ1 within 10 ° ± 5 ° with respect to the direction orthogonal to the flow direction of the exhaust gas in the lateral view, as shown in FIG. is there. Further, in the illustrated embodiment, at least one side drain guide portion 7 is separate from the exhaust gas passage 4 and is attached to the exhaust gas passage 4.

According to the above configuration, the drain discharge device 1 includes at least one side drain guide part 7. At least one side drain guide part 7 includes the side oblique extension part 711. According to the above configuration, the drain that flows along the side surface 43 of the exhaust gas passage 4 to the downstream side of the exhaust gas passage 4 can be blocked by the side drain guide portion 7. In addition, the lateral oblique extension portion 711 pushes the drain attached to the lateral oblique extension portion 711 to the downstream side (downward) by the exhaust gas flowing through the exhaust gas flow path, and the lateral oblique extension portion 711 is formed. Since it can flow downward along it, the drain can be stored in a predetermined place.

In some embodiments, the above-described side drain guide portion 7 includes a left drain guide portion 71 provided so as to project rightward from the left side surface 44 of the exhaust gas passage 4 and an exhaust gas as shown in FIG. 11. And a right drain guide portion 72 provided so as to project leftward from the right side surface 45 of the flow path 4. In this case, the left drain guide part 71 can block the drain flowing along the left side surface 44 of the exhaust gas flow path 4 to the downstream side of the exhaust gas flow path 4, and the right drain guide part 72 The drain flowing along the right side surface 45 of the flow path 4 and flowing to the downstream side of the exhaust gas flow path 4 can be blocked. Further, the drain attached to the left drain guide portion 71 and the right drain guide portion 72 can be made to flow downward along the lateral oblique extension 711.

In some embodiments, the at least one drain guide section 5 described above includes the upper drain guide section 51 described above and the lower drain guide section 52 described above. Then, as shown in FIGS. 11 and 12, the at least one lateral drain guide portion 7 is an upper drain guide portion when viewed from the upstream side of the exhaust gas passage 4 as shown in FIG. 51 and the lower drain guide portion 52 are arranged so as to be continuous with each other. Here, that the side drain guide part 7 is continuous with each of the upper drain guide part 51 and the lower drain guide part 52 means that when viewed from the upstream side of the exhaust gas flow path 4, the side drain guide part 7 is connected to the upper end of the side drain guide part 7. It means that no gap is formed between the upper drain guide portion 51 or between the lower end of the side drain guide portion 7 and the lower drain guide portion 52. In the illustrated embodiment, the drain can be transmitted from the upper drain guide portion 51 to the side drain guide portion 7. In one embodiment, the distance between the upper drain guide portion 51 and the side drain guide portion 7 in the extending direction of the exhaust gas flow path 4 is equal to or less than a certain distance, and the upper end of the side drain guide portion 7 has an upper drain guide. It is located on the downstream side of the portion 51. Further, the lower end of the side drain guide portion 7 is located upstream of the lower drain guide portion 52.

According to the above configuration, at least one drain guide part 5 is provided so as to project downward from the flat ceiling surface 41, and the above-described upper drain guide part 51 provided so as to project upward from the flat bottom surface 42. And a lower drain guide portion 52. The upper drain guide part 51 can block the drain flowing along the ceiling surface 41 of the exhaust gas flow path 4 to the downstream side of the exhaust gas flow path 4, and the lower drain guide part 52 covers the bottom surface 42 of the exhaust gas flow path 4. It is possible to block the drain that is transmitted and flows to the downstream side of the exhaust gas passage 4.

Further, at least one side drain guide part 7 is arranged so as to be continuous with each of the upper drain guide part 51 and the lower drain guide part 52 when viewed from the upstream side of the exhaust gas flow path 4. According to the above configuration, the drain that has flowed along the obliquely extending portion 6 of the upper drain guide portion 51 is sent to the lateral obliquely extending portion 711, and transmitted through the lateral obliquely extending portion 711 to the downward direction. Can be sent to. Further, the drain sent downward along the laterally extending portion 711 can be merged with the drain flowing along the obliquely extending portion 6 of the lower drain guide portion 52.

FIG. 13 is an end view of the exhaust gas passage and the side drain guide portion shown in FIG. 12, taken along the line DD. FIG. 14 is a view corresponding to an end view of the exhaust gas flow passage and the side drain guide section of FIG. 12 taken along the line DD, showing a modification of the side drain guide section.

In some embodiments, the above-mentioned side drain guide part 7 is provided with the exhaust gas flow path 4 from the tip of the side drain guide part 7 (side oblique extension part 711) as shown in FIGS. A side drain receiving portion 712 protruding toward the upstream side. In the embodiment shown in FIG. 13, the above-mentioned lateral drain guide portion 7 projects laterally from the side surface 43 in a direction orthogonal to the exhaust gas flow direction. In the embodiment shown in FIG. 14, the above-described side drain guide portion 7 is inclined so that the tip end is located upstream of the base end portion with respect to the direction orthogonal to the exhaust gas flow direction from the side surface 43. ing. The inclination angle θ2 of the laterally extending portion 711 with respect to the direction orthogonal to the flow direction of the exhaust gas in a top view is within 10 ° ± 5 °. In one embodiment, the inclination angle θ2 is the inclination angle θ of a portion of the upper drain guide portion 51 which is located above the side drain guide portion 7 or the downward drain angle θ2 in order to facilitate smooth drain transmission. It is desirable that the inclination angle θ of the portion of the guide portion 52 located below the lateral drain guide portion 7 is the same (within ± 5 °). In this case, since the inclination angles of the upper drain guide portion 51 and the lower drain guide portion 52 and the side drain guide portion 7 are the same, transmission of drain from the upper drain guide portion 51 to the side drain guide portion 7, And, the drain can be smoothly transmitted from the side drain guide portion 7 to the lower drain guide portion 52.

According to the above configuration, the side drain guide portion 7 includes the side drain receiving portion 712, so that the drain attached to the side drain guide portion 7 and the side surface 43 of the exhaust gas flow path 4 is prevented from flowing into the side drain guide portion 7. It is possible to prevent scattering over the tip of the.

FIG. 15 is a lateral cross-sectional view showing an enlarged vicinity of a portion where a lower drain guide portion of the exhaust gas passage is provided in one embodiment. FIG. 16 is a diagram corresponding to a state in which the exhaust gas passage shown in FIG. 4 is viewed from the direction A and a state in which the upper wall portion including the ceiling surface is removed, and is a diagram for explaining the drain discharge passage. is there.

In some embodiments, the drain discharger 1 described above, as shown in FIG. 15, includes at least one drain storage section 8 for storing the drain collected by the at least one drain guide section 5 described above, And a drain discharge passage 9 for discharging the drain stored in at least one drain storage section 8.

In the illustrated embodiment, the drain storage unit 8 has an internal space 81 for storing the drain, as shown in FIG. 15, and is configured so that the drain is sent from the exhaust gas passage 4. Includes basin 80. Further, the drain discharge flow passage 9 includes a drain discharge pipe 91 having an internal space 92 communicating with the internal space 81 of the drain storage container 80.

The internal space 81 of the drain storage container 80 is partitioned by a plurality of side surfaces 811, a bottom surface 812, and a lower surface 422 of the exhaust gas passage 4. As shown in FIG. 16, a through hole 421 is formed in the bottom surface 42 of the exhaust gas flow path 4 and opens at a position of a reservoir 46 where drain is retained by the drain guide 5 (lower drain guide 52). Further, the internal space 81 and the internal space 92 communicate with each other through a through hole 82 that penetrates the bottom surface 812 of the drain storage container 80.

According to the above configuration, the drain collected by the drain guide section 5 can be stored in the drain storage section 8, and the drain stored in the drain storage section 8 can be discharged to the outside of the exhaust gas flow path 4 by the drain discharge flow path 9. can do. Therefore, according to the above configuration, the amount of drain accumulated in front of the drain guide portion 5 can be reduced, and therefore the drain is prevented from scattering to the downstream side in the exhaust gas flow direction with respect to the drain guide portion 5. You can

As described above, in some embodiments, the drain storage unit 8 described above includes the drain storage container 80 described above. In this case, since the drain can be stored in the drain storage container 80 having the internal space 81, the liquid level of the drain in the reservoir portion 46 of the exhaust gas flow path 4 exceeds the drain guide portion 5, and the drain guides the drain. It is possible to prevent the exhaust gas from flowing downstream of the portion 5 in the flow direction.

In some embodiments, as shown in FIG. 16, a plurality of drain storage parts 8 described above are provided. The drain discharge flow path 9 described above includes a communication pipe 93 that connects the drain storage section 8 to the other drain storage section 8. In this case, since the drain can be dispersed in the plurality of drain storage parts 8, it is possible to prevent the drain from overflowing from the drain storage part 8.

FIG. 17 is an enlarged view showing the vicinity of the exhaust gas passage shown in FIG. 1, and is a view for explaining the drain discharge passage in one embodiment.
In some embodiments, as shown in FIG. 17, the drain discharge flow path 9 described above is provided in either the supply flow path (cleaning liquid circulation line 3) of the cleaning liquid to the absorption tower 2 or the absorption tower 2. The 1st connection part 94 connected is included. The first connection part 94 is provided with a first drain introduction port 941 for introducing the drain flowing through the drain discharge passage 9 into the supply passage (cleaning liquid circulation line 3) or the absorption tower 2.

In the illustrated embodiment, the drain storage section 8 described above collects the first drain storage section 8A and the second drain guide section 5B configured to store the drain collected in the first drain guide section 5A. A second drain storage portion 8B configured to store the drained drain. The drain discharge flow path 9 described above is configured to discharge the drain by the weight of the drain, and the first drain discharge flow path 95 for discharging the drain from the first drain storage portion 8A and the second drain storage flow path 95. A second drain discharge passage 96 for discharging drain from the portion 8B, and a third drain discharge provided on the downstream side of each of the first drain discharge passage 95 and the second drain discharge passage 96 in the drain flow direction. And a flow path 97. The first connecting portion 94 is provided at the downstream end of the third drain discharge flow path 97 in the drain flow direction, and is connected to the absorption tower 2.

According to the above configuration, the first connecting portion 94 is connected to the supply channel (cleaning liquid circulation line 3) of the cleaning liquid to the absorption tower 2 and the absorption tower 2, and the drain flowing in the drain discharge flow path 9 is A first drain introduction port 941 for introducing into the supply channel or the absorption tower 2 is formed. The drain flowing through the drain discharge flow path 9 is introduced into the supply flow path and the absorption tower 2 through the first connecting portion 94, and thus can be reused as a cleaning liquid. Further, since the supply passage of the cleaning liquid to the absorption tower 2 and the absorption tower 2 are located in the vicinity of the exhaust gas passage 4, the drain discharge passage 9 including the first connection portion 94 can be shortened.

FIG. 18 is an enlarged view showing the vicinity of the exhaust gas passage shown in FIG. 1, and is a diagram for explaining the drain discharge passage in one embodiment.
In some embodiments, as shown in FIG. 18, the drain discharge flow path 9 described above is a drain flow of the device 18 (heating device 18A) located downstream of the drain discharge device 1 in the flow direction of the exhaust gas. It includes a second connecting portion 98 connected to the passage 181. The second connecting portion 98 is provided with a second drain introduction port 981 for introducing the drain flowing through the drain discharge passage 9 into the drain passage 181.

In the illustrated embodiment, the drain storage section 8 described above includes the first drain storage section 8A described above and the second drain storage section 8B described above. The drain discharge flow path 9 described above is configured to discharge the drain by the weight of the drain, and the first drain discharge flow path 95 described above, the second drain discharge flow path 96 described above, and the third drain described above. And a drain discharge channel 97. The second connection portion 98 is provided at the downstream end of the third drain discharge flow passage 97 in the drain flow direction, and is connected to the drain flow passage 181 that discharges the drain from the device 18.

According to the above configuration, the second connecting portion 98 is connected to the drain flow passage 181 of the device 18 located downstream of the drain discharge device 1 in the flow direction of the exhaust gas and flows through the drain discharge flow passage 9. A second drain introduction port 981 for introducing the drain into the drain passage 181 of the device 18 is formed. The drain flowing through the drain discharge channel 9 is introduced into the drain channel 181 for discharging the drain of the device 18 via the second connecting portion 98. Since the device 18 and the drain flow passage 181 are located in the vicinity of the exhaust gas flow passage 4, the drain discharge flow passage 9 including the second connection portion 98 can be shortened.

In some embodiments, as shown in FIGS. 17 and 18, the drain storage unit 8 described above includes the first drain storage unit 8A described above and a downstream side of the exhaust gas passage 4 with respect to the first drain storage unit 8A. And the above-described second drain storage section 8B provided in the. The drain discharge flow path 9 described above discharges the above-described first drain discharge flow path 95 for discharging the drain stored in the first drain storage section 8A and the drain stored in the second drain storage section 8B. And the above-mentioned third drain discharge flow passage 97 provided on the downstream side of each of the first drain discharge flow passage 95 and the second drain discharge flow passage 96 in the drain flow direction. And, including.

According to the above configuration, the drain discharge flow passage 9 includes the first drain discharge flow passage 95 for discharging the drain stored in the first drain storage unit 8A and the exhaust gas flow passage more than the first drain storage unit 8A. The second drain discharge passage 96 for discharging the drain stored in the second drain storage portion 8B provided on the downstream side of the first drain storage portion 8A and the second drain storage portion 8B. Drain can be discharged from both. Further, the drain discharge flow passage 9 further includes a third drain discharge flow passage 97 provided on the downstream side of each of the first drain discharge flow passage 95 and the second drain discharge flow passage 96. In other words, the third drain discharge flow passage 97 can simplify the configuration of the drain discharge flow passage 9 by integrating the downstream sides of the first drain discharge flow passage 95 and the second drain discharge flow passage 96, respectively. It is possible to improve maintainability. Further, by simplifying the configuration of the drain discharge flow passage 9, the layout of the drain discharge flow passage 9 can be improved, and the amount of piping required for the drain discharge flow passage 9 can be reduced. ..

In some of the above-described embodiments, the absorption tower has been described as an example, but the present invention can be applied to reactors other than the absorption tower. It is sufficient that the reactor is configured to remove the air pollutants from the exhaust gas by bringing the cleaning liquid into contact with the exhaust gas, and the method for removing the air pollutants by the reactor is not limited to absorption removal.

The present invention is not limited to the above-described embodiment, and includes a form in which the above-described embodiment is modified and a form in which these forms are appropriately combined.

For example, in some of the above-described embodiments, the exhaust gas discharge part 24 is provided on the opposite side of the exhaust gas main body part 22 from the exhaust gas introduction part 23 in the first direction. It may be provided on the same side. Further, the exhaust gas discharge part 24 may be provided so as to be adjacent to the absorption tower main body part 22 in the second direction orthogonal to the first direction in a top view.

1 Drain Discharge Device 2 Absorption Tower 21A Gas-Liquid Contact Portion 21B Liquid Reservoir Section 3 Cleaning Liquid Circulation Line 4 Exhaust Gas Flow Channel 41 Ceiling Surface 42 Bottom Surface 43 Side 44 Left Side 45 Right Side 5 Drain Guide 5A First Drain Guide 5B Second Drain guide part 51 Upper drain guide part 52 Lower drain guide part 6 Oblique extension part 6A First oblique extension part 6B Second oblique extension part 7 Side drain guide part 71 Left drain guide part 72 Right side Drain guide part 8 Drain storage part 8A First drain storage part 8B Second drain storage part 80 Drain storage basin 9 Drain discharge passage 10 Exhaust gas purification system 11 Combustion device 12 Exhaust gas introduction line 13 Dust collector 14 Induction fan 15 Heat recovery device 16 Chimney 17 Exhaust gas discharge line 17A 1st Gas discharge line 17B second exhaust gas discharge line 18 device 18A heating device

Claims (15)

1. A drain discharge device for discharging the drain generated in the exhaust gas flow path in which the exhaust gas discharged from the reactor configured to bring the exhaust gas and the cleaning liquid into gas-liquid contact,
   The cross-sectional shape of the exhaust gas passage includes at least one of a flat ceiling surface or a flat bottom surface,
   The drain discharge device is
   At least one drain guide portion provided so as to project from at least one of the flat ceiling surface or the flat bottom surface of the exhaust gas passage, and is oblique with respect to the extending direction of the exhaust gas passage when viewed from above A drain discharge device including at least one drain guide portion including at least one obliquely extending portion extending in the direction.
2. The at least one obliquely extending portion extends in a direction intersecting with the first obliquely extending portion at an obtuse angle with respect to a direction in which the first obliquely extending portion extends in a top view. The drain discharge device according to claim 1, further comprising a second oblique extension portion.
3. The at least one drain guide part includes a first drain guide part and a second drain guide part provided on the downstream side of the exhaust gas flow path with respect to the first drain guide part. Drain discharge device.
4. The drain discharge device according to claim 3, wherein at least one of the first drain guide portion and the second drain guide portion is provided at a transition of a flow passage area of the exhaust gas flow passage.
5. The cross-sectional shape of the exhaust gas passage includes at least one flat side surface,
   The drain discharge device is
   At least one lateral drain guide portion provided so as to project from the at least one flat side surface of the exhaust gas flow passage, and extending in an oblique direction with respect to the extending direction of the exhaust gas flow passage in a side view And further comprising at least one lateral drain guide portion including a lateral oblique extension portion whose lower portion is located on the downstream side of the exhaust gas flow passage rather than upper portion. The drain discharge device described in.
6. The at least one side drain guide part is a left drain guide part provided so as to project from a left side surface of the at least one flat side surface that is located leftward when viewed from the upstream side of the exhaust gas flow path, The drain discharge device according to claim 5, further comprising a right drain guide portion provided so as to project from a right side surface of the at least one flat side surface that is located on the right side when viewed from the upstream side of the exhaust gas flow path. ..
7. The at least one drain guide portion includes an upper drain guide portion provided so as to project downward from the flat ceiling surface, and a lower drain guide portion provided so as to project upward from the flat bottom surface,
   The at least one side drain guide part is arranged so as to be continuous with each of the upper drain guide part and the lower drain guide part when viewed from the upstream side of the exhaust gas flow path. The drain discharge device described in.
8. The said at least 1 side drain guide part is equipped with the side drain receiving part which protrudes toward the upstream side of the said exhaust gas flow path from the front-end | tip of the said side drain guide part. The drain discharge device described.
9. The drain discharge device according to any one of claims 1 to 8, wherein the at least one drain guide part includes a drain receiving part projecting from a tip of the drain guide part toward an upstream side of the exhaust gas passage.
10. At least one drain storage unit for storing the drain collected by the at least one drain guide unit,
    The drain discharge device according to any one of claims 1 to 9, further comprising: a drain discharge flow path for discharging the drain stored in the at least one drain storage section.
11. The drain discharge according to claim 10, wherein the at least one drain storage unit has an internal space for storing the drain, and includes a drain storage basin configured to send the drain from the exhaust gas passage. apparatus.
12. The drain discharge flow path is a supply flow path of the cleaning liquid to the reactor, or a first connection part connected to either one of the reactors, and the drain flowing through the drain discharge flow path is The drain discharge device according to claim 10 or 11, further comprising a first connection portion in which a first drain introduction port for introducing into a supply channel or the reactor is formed.
13. The drain discharge flow path is a second connecting portion that is connected to a drain flow path of a device located downstream of the drain discharge device in the flow direction of the exhaust gas, and the drain flow path flows through the drain discharge flow path. The drain discharge device according to claim 10 or 11, further comprising a second connection portion having a second drain introduction port for introducing a drain into the drain flow path.
14. The at least one drain storage part includes a first drain storage part, and a second drain storage part provided on the downstream side of the exhaust gas passage with respect to the first drain storage part,
    The drain discharge channel is
    A first drain discharge passage for discharging the drain stored in the first drain storage section;
    A second drain discharge passage for discharging the drain stored in the second drain storage section;
    The third drain discharge passage provided on the downstream side of each of the first drain discharge passage and the second drain discharge passage in the flow direction of the drain. The drain discharge device described.
15. The inclination angle θ is within 10 ° ± 5 °, where θ is an inclination angle with respect to a direction orthogonal to the extending direction of the exhaust gas flow channel in a top view. Item 15. The drain discharge device according to any one of Items 1 to 14.

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