TW202021662A - Gas-liquid mixing device, and exhaust gas desulfurization device comprising gas-liquid mixing device - Google Patents

Abstract

This spraying nozzle is provided with: a first cylinder part in which there are formed a cleansing liquid introduction opening for introducing a cleansing liquid, a gas introduction opening for introducing a gas along a direction orthogonal to the flow direction of the cleansing liquid, and a discharge opening for discharging a mixed fluid of the cleansing liquid and the gas; a throttling part provided farther upstream in the flow direction of the cleansing liquid than a merge part at which the cleansing liquid and the gas merge; and a second cylinder part in which there is formed a second gas introduction opening for introducing the gas into a second flow path that communicates with the gas introduction opening. This gas-liquid mixing device includes: the spraying nozzle; and an expansion joint that includes a barrel part configured so as to be capable of expanding and contracting, the expansion joint being provided to a cleansing liquid introduction line for sending the cleansing liquid from the cleansing liquid introduction opening into a first flow path and/or to a gas introduction line for sending the gas from the second gas introduction opening into the second flow path.

Description

Gas-liquid mixing device and exhaust desulfurization device with gas-liquid mixing device

The present disclosure relates to a gas-liquid mixing device for spraying oxygen-containing gas and cleaning liquid toward the liquid collecting part of the absorption tower for storing the cleaning liquid in contact with the exhaust gas discharged from the combustion device, and An exhaust gas desulfurization device equipped with the gas-liquid mixing device.

An exhaust gas discharged from a boiler and the like, for example, combustion engine containing SO _x (sulfur oxides) and other air pollutants. The method used to reduce the SO _x contained in the exhaust gas includes a wet desulfurization method in which SO ₂ etc. are absorbed and removed with an absorbent such as alkaline aqueous solution or absorbent slurry.

Among the exhaust gas desulfurization equipment using the above wet desulfurization method, there are those equipped with an absorption tower which defines a gas-liquid contact part and a liquid collecting part inside, and the gas-liquid contact part is directed to the cleaning liquid by The exhaust gas sprayed in the absorption tower makes the exhaust gas contact with the cleaning liquid; the liquid collecting part is located below the gas-liquid contact part for storing the sprayed cleaning liquid (for example, refer to Patent Document 1). As the exhaust gas contacts the cleaning liquid, the SO ₂ contained in the exhaust gas is absorbed by the cleaning liquid. Store the cleaning liquid after absorbing SO ₂ in the liquid collecting part.

Since the cleaning liquid stored in the sump contains reaction products such as sulfite generated by the SO ₂ absorbed from the exhaust gas, in order to remove the reaction products, oxygen-containing gas such as air may be spread over The cleaning liquid stored in the liquid collecting part oxidizes the reaction product.

Patent Document 1 discloses a gas-liquid mixing device including an ejection nozzle configured to eject a mixed fluid of the above-mentioned oxygen-containing gas and cleaning liquid from an ejection port toward a liquid collecting portion. The spray nozzle is provided with a constriction in the middle of the flow path of the cleaning liquid, and the constriction part shrinks the flow of the cleaning liquid flowing in the flow path to generate a negative pressure area. Due to the suction force generated in the negative pressure region, the gas supplied through the branch pipe is sucked toward the downstream side of the constricted portion of the flow channel. In addition, the spray nozzle cuts the sucked gas by the cleaning liquid flowing in the flow channel of the cleaning liquid to produce a mixed fluid (cleaning liquid containing fine bubbles), and sprays the mixed fluid from the ejection port.

The injection nozzle includes a main pipe for flowing a cleaning liquid (including a mixed fluid), and the branch pipe (gas introduction pipe) for introducing gas into the main pipe. Here, in order to efficiently cut off and miniaturize the gas, the branch piping is configured such that its axis extends in a direction orthogonal to the axial direction of the main pipe, and in the main pipe, it extends along the direction orthogonal to the flow direction of the cleaning liquid Into the direction of the gas. The gas-liquid mixing device also has a cleaning liquid introduction line and a gas introduction line in addition to the above-mentioned spray nozzle. The cleaning liquid introduction line includes a cleaning liquid introduction pipe connected to the main pipe, and the cleaning liquid is introduced into the main pipe through a cleaning liquid introduction port formed in the main pipe. The gas introduction line includes a gas introduction pipe connected to the branch pipe, and the gas is introduced into the branch pipe through a gas introduction port formed in the branch pipe. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 5046755

[Problems to be solved by the invention]

The spray nozzle is transferred from the cleaning liquid introduction pipe in the cleaning liquid introduction line along the axial direction of the main pipe and contracted due to vibration or heat. In addition, the injection nozzle is transmitted from the gas introduction pipe in the gas introduction line in a direction orthogonal to the axial direction of the main pipe, and contraction due to vibration or heat is transmitted. That is, since the nozzles are superimposed and transmitted from two directions orthogonal to each other and contracted due to vibration or heat, there is a risk of abrasion or damage of the nozzles.

In view of the above-mentioned situation, the purpose of at least one embodiment of the present invention is to provide a method that can prevent both the self-cleaning liquid introduction line and the gas introduction line from transmitting to the injection nozzle due to the contraction caused by vibration or heat, causing the injection nozzle to wear or damage.的gas-liquid mixing device. [Technical means to solve the problem]

(1) The gas-liquid mixing device of at least one embodiment of the present invention includes an injection nozzle configured to flow into an absorption tower that is configured to make the cleaning liquid and exhaust gas discharged from the combustion device come into gas-liquid contact The liquid collecting part used to store the above-mentioned cleaning liquid, spray oxygen-containing gas and the above-mentioned cleaning liquid; and The above spray nozzle has: The first cylindrical portion defines a first flow path inside, and is formed with a cleaning liquid inlet for introducing the cleaning liquid to the first flow path, and is used to guide the cleaning liquid along the direction relative to the cleaning liquid inlet The gas is introduced into the gas inlet of the first flow channel in a direction orthogonal to the flow direction of the cleaning liquid flowing in the first flow channel, and the cleaning liquid introduced from the cleaning liquid inlet is ejected from the cleaning liquid. The jet port of the mixed fluid of the above gas introduced by the gas inlet; A constriction part, which is arranged on the upstream side of the flow direction of the cleaning liquid than the confluence part where the cleaning liquid introduced from the cleaning liquid inlet and the gas introduced from the gas inlet merge; and The second cylindrical portion defines a second flow passage communicating with the gas inlet and is formed to introduce the gas to the second flow in a direction orthogonal to the flow direction of the cleaning liquid The second gas inlet of the road; The gas-liquid mixing device further includes: The telescopic pipe joint includes a main body that is configured to extend and retract at least along the direction in which the introduction channel extends, and is provided for At least one of the cleaning liquid introduced from the cleaning liquid inlet to the cleaning liquid introduction line of the first flow channel, or the gas introduction line used to transport the gas from the second gas inlet to the second flow channel By.

According to the above-mentioned configuration (1), the gas-liquid mixing device includes a telescopic tube joint provided in at least one of the cleaning liquid introduction line or the gas introduction line, and the injection nozzle. The telescopic pipe joint includes a main body, and the main body defines an introduction channel for conveying cleaning liquid or gas inside, and is configured to expand and contract freely along the extending direction of the introduction channel. Since this type of gas-liquid mixing device absorbs the contraction caused by vibration or heat by the expansion pipe joint, it can prevent at least one of the self-cleaning liquid introduction line or the gas introduction line from transmitting the contraction caused by vibration or heat to the spray nozzle. Since it can prevent the nozzle from being superimposed and transmitted from the two orthogonal directions to the nozzle due to the shrinkage caused by vibration or heat, it can suppress the abrasion or damage of the nozzle.

(2) In some embodiments, the gas-liquid mixing device as described in (1) above, wherein the expansion joint is provided in both the cleaning liquid introduction line and the gas introduction line.

According to the configuration of (2) above, since the expansion pipe joint is provided in both the cleaning liquid introduction line and the gas introduction line, it is possible to prevent the transmission of vibration or heat from both the cleaning liquid introduction line and the gas introduction line to the spray nozzle. shrink. According to the above configuration, compared to the case where the expansion pipe joint is installed in at least one of the cleaning liquid introduction line or the gas introduction line, it is possible to more reliably prevent the superimposed transmission of vibration or vibration or transmission to the nozzle from two orthogonal directions. Shrinkage caused by heat.

(3) In some embodiments, the gas-liquid mixing device described in (1) or (2) above, wherein the spray nozzle further includes: a cleaning liquid introduction side fastening portion, which is from the first cylindrical portion than the above The confluence part is arranged protrudingly on the outer periphery of the upstream side of the flow direction of the cleaning liquid; and The first expansion pipe joint, which is the expansion pipe joint provided on the cleaning fluid introduction line, further includes: a downstream side fastening portion from the main body portion in a direction intersecting the direction in which the axis of the first expansion pipe joint extends The outer circumference is protruding, and the constriction is sandwiched between the first telescopic pipe joint and the first cylindrical part, and fixed to the cleaning liquid introduction side fastening part by the first fastening device .

According to the configuration of (3) above, the downstream side fastening part of the first expansion pipe joint is passed through the first fastening device with the constriction limiting part sandwiched between the first expansion joint and the first cylindrical part. The cleaning liquid fixed on the side of the spray nozzle is introduced into the fastening part on the side tightly.

(4) The exhaust gas desulfurization device of at least one embodiment of the present invention is used to desulfurize exhaust gas discharged from a combustion device, and has: An absorption tower, which is configured to make the cleaning liquid come into gas-liquid contact with the exhaust gas introduced into the interior, and a liquid collecting part for storing the cleaning liquid is defined inside; and The gas-liquid mixing device described in any one of (1) to (3) above.

According to the configuration of (4) above, the absorption tower is configured such that the cleaning liquid and the exhaust gas introduced into the inside are brought into gas-liquid contact, and a liquid collecting part for storing the cleaning liquid is defined inside. The gas-liquid mixing device sprays the mixed fluid from the nozzle of the spray nozzle to the liquid collecting part of the absorption tower, so that the cleaning liquid stored in the liquid collecting part of the absorption tower can generate sufficient oxidation reaction. In addition, according to the above-mentioned structure, since the shrinkage caused by vibration or heat can be prevented from being superimposed and transmitted to the nozzle from two directions orthogonal to each other, it is possible to suppress abrasion or damage of the nozzle.

(5) In some embodiments, the exhaust gas desulfurization device described in (4) above, wherein the first cylindrical portion extends along the central axis of the nozzle, and the nozzle further includes: a nozzle-side fastening portion , Which protrudes from the outer periphery of the first cylindrical portion on the downstream side of the flow direction of the cleaning liquid than the confluence portion and along a direction orthogonal to the central axis of the ejection port; the absorption tower further includes: The side wall defines at least a part of the liquid collecting portion, and is formed with an insertion hole through which the end of the first cylindrical portion including the ejection port is inserted; a cylindrical protrusion that connects the ejection port When the angle at which the central axis is inclined from the horizontal plane is set to θ, along the direction inclined from the horizontal plane at the same angle as the inclination angle θ, protrude from the peripheral edge of the through hole of the side wall toward the outside of the side wall; and spray The nozzle fastening portion is one that protrudes from the end of the cylindrical protrusion in a direction orthogonal to the direction in which the cylindrical protrusion extends, and is configured to be fixed to the nozzle by a second fastening device Outlet side fastening part.

According to the configuration of (5) above, in a state where the end of the first cylindrical portion including the ejection port is inserted into the insertion hole formed in the side wall of the absorption tower, the gas-liquid mixing device is made by the second fastening device The nozzle side fastening part is fixed to the nozzle fastening part of the absorption tower. Since the spray nozzle is fixed to the absorption tower, if the contraction caused by vibration or heat is transmitted to the spray nozzle from both the cleaning liquid introduction line and the gas introduction line, the position or angle of the spray nozzle can be prevented from shifting. The oxidation reaction of the mixed fluid sprayed from the spray nozzle to the cleaning liquid is reduced.

Furthermore, according to the above configuration, the first cylindrical portion extends along the central axis of the ejection port. The cylindrical protrusion of the absorption tower extends along the direction inclined from the horizontal plane at the same angle as the angle θ at which the central axis of the ejection outlet is inclined from the horizontal plane. That is, the cylindrical protrusion of the absorption tower extends in the same direction as the central axis of the ejection port when the first cylindrical portion is provided. Since the first cylindrical portion is fixed by the second fastening device, the ejection port-side fastening portion extending in the direction orthogonal to the direction in which the first cylindrical portion extends is positively aligned with the direction in which the cylindrical protrusion extends. The fastening part for the spray nozzle extending in the opposite direction can directly use the angle θ at which the center axis of the spray port is inclined from the horizontal plane as the installation angle. Therefore, according to the above-mentioned structure, the work of adjusting the installation angle of the first cylindrical part is not required, and the installation work of the first cylindrical part can be facilitated. [Effect of invention]

According to at least one embodiment of the present invention, there is provided a gas-liquid mixing device that can prevent both the self-cleaning liquid introduction line and the gas introduction line from transmitting to the injection nozzle due to the contraction caused by vibration or heat, causing the injection nozzle to wear or damage.

Several embodiments of the present invention will be described below with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of the constituent parts described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. For example, expressions representing relative or absolute arrangements such as "toward a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" not only strictly refer to that kind of Configuration also means the state of relative displacement with tolerance or angle or distance to the extent that the same function can be obtained. For example, expressions such as "identical", "equal", and "homogeneous" that indicate the state of things being equal not only strictly indicate the state of equality, but also indicate the state of tolerance or difference in the degree to which the same function can be obtained. For example, the expressions representing shapes such as quadrangular shapes or cylindrical shapes not only refer to shapes such as quadrangular shapes or cylindrical shapes in a geometrically strict sense, but also include concave and convex portions or chamfered portions within the range where the same effect can be obtained. shape. On the other hand, the expression of a component as “equipped”, “have”, “have”, “include”, or “contain” does not exclude the existence of other components. In addition, for the same configuration, the same reference numerals are sometimes attached to omit the description.

Fig. 1 is a cross-sectional view showing a schematic configuration of an exhaust gas desulfurization device according to an embodiment. The exhaust gas desulfurization device is a device used to desulfurize the exhaust gas discharged from the combustion device. Examples of the aforementioned combustion device include engines such as diesel engines, gas turbine engines, or steam turbine engines, boilers, and the like. As shown in FIG. 1, the exhaust gas desulfurization device 1 includes an absorption tower 2 and a gas-liquid mixing device 4.

The absorption tower 2 is configured to make gas-liquid contact between the cleaning liquid and the exhaust gas introduced into the inside. In the embodiment shown in the figure, the absorption tower 2 is as shown in FIG. 1, and is configured to be internally defined: a gas-liquid contact portion 21A, which is configured to spray the exhaust gas introduced into the interior with a cleaning liquid to make the exhaust gas and the cleaning liquid Gas-liquid contact; and the liquid collection part 21B, which is located below the gas-liquid contact part, for storing the cleaning liquid of SO _x absorbed in the exhaust gas in the gas-liquid contact part 21A. Here, as the cleaning liquid, a liquid containing an alkaline agent, seawater, and the like are mentioned. In addition, as the alkaline agent, for example, CaCO ₃ , NaOH, Ca(OH) ₂ , NaHCO ₃ , Na ₂ CO _3, etc., and alkali whose volume is reduced to a high concentration can also be used.

In more detail, the absorption tower 2 as shown in FIG. 1 is provided with an absorption tower main body 22, which defines an internal space 21 including the above-mentioned gas-liquid contact part 21A and the above-mentioned liquid collecting part 21B; The part 23 is used to introduce the exhaust gas to the absorption tower main body 22; and the exhaust gas discharge part 24 is used to discharge the exhaust gas from the absorption tower main body 22. As shown in Figure 1, the direction in which the absorption tower main body 22 and the exhaust gas introduction portion 23 are adjacent is defined as the first direction, and the exhaust gas introduction portion 23 side in the first direction is defined as one side, and the first direction The side of the exhaust discharge portion 24 is defined as the other side.

As shown in FIG. 1, the first side wall 25, which is one of the side walls in the first direction of the absorption tower main body 22, is formed with an exhaust inlet 251 communicating with the internal space 21 (lower internal space 21C). The second side wall 26, which is the other side wall in the first direction of the absorption tower body 22, is formed at a position higher than the exhaust inlet 251 to communicate with the inner space 21 (upper inner space 21D)气出口261。 Air exhaust port 261. 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 plan view, and defines at least a part of the internal space 21 including the liquid collecting portion 21B.

The exhaust gas introduced from the combustion device (not shown) to the exhaust gas introduction portion 23 passes through the exhaust gas introduction portion 23 and then is introduced into the internal space 21 (lower internal space 21C) through the exhaust gas introduction port 251. The exhaust gas introduced into the internal space 21 flows in the lower internal space 21C from the first side wall 25 on one side to the second side wall 26 on the other side, and then flows in the internal space 21 while rising. The exhaust gas that rises to the upper internal space 21D flows from the first side wall 25 to the second side wall 26, and then is discharged to the exhaust gas discharge portion 24 through the exhaust gas discharge port 261.

As shown in Figure 1, the gas-liquid contact portion 21A of the absorption tower main body 22 located above the lower internal space 21C and below the upper internal space 21D is arranged to spread the above-mentioned cleaning liquid in the internal space 21 of the spreading device 28. The spreading device 28 is configured to spread the cleaning liquid to the exhaust gas passing through the gas-liquid contact portion 21A, and contact the exhaust gas with the cleaning liquid to absorb and remove SO _x (including SO ₂ ) contained in the exhaust gas.

As shown in FIG. 1, the spreading device 28 includes a sprinkler pipe 281 that extends in the inner space 21 of the absorption tower main body 22 along the above-mentioned first direction; and a plurality of sprinkler nozzles 282 which are provided in the sprinkler pipe 281. The sprinkler nozzle 282 is configured to spread the washing 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 embodiment shown in the figure, the sprinkler nozzle 282 sprays the cleaning liquid in a liquid column. That is, the absorption tower 2 shown in the figure is a liquid column absorption tower.

In addition, the absorption tower 2 is not limited to the above-mentioned liquid column type as long as it is configured such that the cleaning liquid is brought into contact with the exhaust gas liquid introduced into the inside. For example, the absorption tower 2 may be a grid type absorption tower equipped with a packing layer for filling the internal space 21 with a packing material for promoting gas-liquid contact, or a spray type equipped with a sprinkler nozzle 282 that sprays the cleaning liquid radially Absorption tower etc. In addition, the sprinkler pipe 281 may extend in a direction orthogonal to the first direction in a plan view. In addition, the sprinkler nozzle 282 may be configured to spread the cleaning liquid downward in the vertical direction.

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

In the illustrated embodiment, the mist eliminator 27 is disposed in the exhaust gas discharge portion 24 and extends in the vertical direction to partition the upstream and downstream sides of the exhaust gas flow direction in the exhaust gas discharge portion 24. In addition, the mist eliminator 27 may be arranged in the upper internal space 21D and extend in the horizontal direction. In addition, the mist eliminator 27 may be configured in multiple stages.

The liquid collecting part 21B is configured to store the cleaning liquid after the spraying of the exhaust gas introduced into the internal space 21 has been dispersed. In the illustrated embodiment, the liquid collecting portion 21B is provided such that the liquid surface is located below the lower internal space 21C and lower than the position of the exhaust gas inlet 251. The cleaning liquid stored in the liquid collecting part 21B contains the reaction product generated by the SO _x absorbed from the exhaust gas. Here, as a reaction product, exemplified by sulfite in the absorption of SO ₂ generated in the cleaning liquid.

As shown in FIG. 1, in the second side wall 26, at a position near the bottom surface 211 of the liquid collecting portion 21B in the vertical direction, an opening is opened to guide the cleaning liquid stored in the liquid collecting portion 21B to the outside. . The cleaning liquid outlet 262 communicates with the liquid collecting part 21B.

In the illustrated embodiment, the exhaust gas desulfurization device 1 as shown in FIG. 1 is further provided with: a cleaning liquid circulation line 7 configured to transport the cleaning liquid stored in the liquid collecting portion 21B to the spreading device 28; and cleaning liquid supply The line 8 is configured to supply the cleaning liquid to the liquid collection part 21B from the outside of the absorption tower 2.

The cleaning fluid circulation line 7 includes: at least one piping 71 connected to the above-mentioned cleaning fluid outlet 262 and the above-mentioned sprinkler pipe 281; and a cleaning fluid circulation pump 72, which is arranged in the middle of the cleaning fluid circulation line 7 for self-cleaning The liquid introduction port 262 conveys the cleaning liquid to the sprinkler pipe 281. That is, at least a part of the cleaning liquid dispersed from the spreading device 28 and stored in the liquid collecting portion 21B is pressure-fed by the cleaning liquid circulation pump 72, and is sent to the spreading device 28 through the cleaning liquid circulation line 7.

The cleaning liquid supply line 8 includes: a cleaning liquid storage tank 81 which is provided outside the absorption tower 2; and at least one pipe 82 which connects the cleaning liquid storage tank 81 and the liquid collection part 21B. The cleaning liquid is transported from the cleaning liquid storage tank 81 to the liquid collection part 21B through the cleaning liquid supply line 8.

As shown in FIG. 1, the gas-liquid mixing device 4 includes an injection nozzle 5 configured to inject a mixed fluid MF of an oxygen-containing gas such as air and a cleaning liquid to the liquid collecting part 21B of the absorption tower 2; and a cleaning liquid introduction line 41, which is configured to deliver cleaning liquid to the spray nozzle 5; and a gas introduction line 42 which is configured to deliver oxygen-containing gas to the spray nozzle 5. The gas-liquid mixing device 4 injects the mixed fluid MF from the spray nozzle 5 toward the liquid collecting part 21B, so that the mixed fluid MF is spread over the cleaning liquid stored in the liquid collecting part 21B, and the above-mentioned reaction product is oxidized by the mixed fluid MF to produce oxidation Product. As an oxidation product, gypsum etc. are mentioned.

In the illustrated embodiment, as shown in FIG. 1, the exhaust gas desulfurization device 1 further includes a cleaning liquid discharge line 9 configured to discharge the cleaning liquid containing oxidation products (gypsum etc.) stored in the liquid collecting part 21B. In the embodiment shown in FIG. 1, the cleaning liquid discharge line 9 is configured to discharge the cleaning liquid through the cleaning liquid circulation line 7 connected to the liquid collecting portion 21B. In more detail, the cleaning fluid discharge line 9 branches from the branch 73 of the cleaning fluid circulation line 7 and is connected to the device 91 provided outside the absorption tower 2. The branch 73 of the self-cleaning fluid circulation line 7 will contain oxidation products The cleaning liquid is delivered to the device 91. Examples of the device 91 include a dehydrator (separator) for dehydrating water from a cleaning liquid containing oxidation products, a storage tank for temporarily storing the cleaning liquid, and the like.

In the embodiment shown in FIG. 1, the cleaning liquid introduction line 41 is branched from the cleaning liquid circulation line 7 at the branch portion 44 located downstream of the branch portion 73 in the flow direction of the cleaning liquid. The above-mentioned cleaning liquid circulation pump 72 transports a part of the cleaning liquid from the cleaning liquid outlet 262 to the spray nozzle 5 via the branch portion 44.

In the illustrated embodiment, one end of the gas introduction line 42 is connected to the injection nozzle 5, and the other end is open to the atmosphere at a position higher than the liquid level of the liquid collecting portion 21B.

Fig. 2 is a schematic cross-sectional view of a spray nozzle for explaining the function of the spray nozzle of an embodiment. Fig. 3 is a cross-sectional view showing the schematic configuration of an injection nozzle according to an embodiment. As shown in FIGS. 2 and 3, the spray nozzle 5 includes a first cylindrical portion 52, a constriction restricting portion 53, and a second cylindrical portion 54.

As shown in FIGS. 2 and 3, the first cylindrical portion 52 is formed in a cylindrical shape that defines the first flow passage 55 inside. The first cylindrical portion 52 is formed with a cleaning liquid introduction port 56 for introducing the cleaning liquid into the first flow passage 55, so as to be introduced along with respect to the self-cleaning liquid introduction port 56 and flow in the first flow passage 55 The gas is introduced into the gas inlet 57 of the first flow path 55 and the ejection outlet 51 described above in a direction orthogonal to the flow direction of the cleaning liquid. The ejection port 51 is provided for ejecting the mixed fluid MF of the cleaning liquid introduced from the cleaning liquid inlet 56 and the gas introduced from the gas inlet 57.

In the embodiment shown in FIGS. 2 and 3, the first cylindrical portion 52 has a longitudinal direction along the extending direction of the central axis CA of the ejection port 51. The opening at one end in the longitudinal direction of the first cylindrical portion 52 is the above-mentioned cleaning liquid introduction port 56, and the other opening in the longitudinal direction of the first cylindrical portion 52 is the above-mentioned ejection port 51. The gas inlet 57 described above is opened on the outer periphery of the first cylindrical portion 52. The self-cleaning liquid introduction line 41 is sent to the cleaning liquid in the first flow channel 55 through the cleaning liquid introduction port 56, and flows in the direction along the extending direction of the central axis CA in the first flow channel 55 from the cleaning liquid introduction port 56 Ejection outlet 51.

As shown in FIGS. 2 and 3, the second cylindrical portion 54 defines a second flow path 58 communicating with the gas inlet 57 along the gas inlet direction of the gas inlet 57 (positive relative to the flow direction of the cleaning liquid). It extends in the opposite direction) and forms a second gas introduction port 59 for introducing gas into the second flow channel 58.

In the embodiment shown in FIGS. 2 and 3, the second cylindrical portion 54 has a longitudinal direction along the direction in which the central axis CA2 of the gas inlet 57 extends, that is, the direction orthogonal to the direction in which the central axis CA of the ejection port 51 extends. . One end in the longitudinal direction of the second cylindrical portion 54 is integrally connected to the outer circumference of the first cylindrical portion 52. That is, the first cylindrical portion 52 and the second cylindrical portion 54 are integrally formed. The opening at the other end of the second cylindrical portion 54 in the longitudinal direction is the second gas introduction port 59 described above. The gas sent from the gas introduction line 42 into the second flow channel 58 through the second gas introduction port 59 passes through the second flow channel 58 and then is sent into the first flow channel 55 through the gas introduction port 57. The gas sent into the first flow channel 55 merges with the cleaning liquid in the merging part 60.

As shown in FIGS. 2 and 3, the constriction portion 53 is provided on the upstream side of the flow direction of the cleaning liquid more than the confluence portion 60. The constriction portion 53 flows the cleaning fluid inside, and opens out a constriction flow forming port 61 whose cross-sectional area is sharply reduced compared to the upstream and downstream sides of the flow direction of the cleaning fluid. The constriction part 53 is configured to contract the cleaning liquid with the constriction flow forming port 61 to generate a negative pressure area 62 on the downstream side of the constriction part 53 in the flow direction of the cleaning liquid (refer to FIG. 2 ). The injection nozzle 5 sucks gas from the airflow inlet 57 by the suction force generated in the negative pressure area 62. In addition, if the amount of gas delivered to the first flow channel 55 by the above-mentioned suction force is insufficient, a pump not shown in the figure can be installed in the gas introduction line 42 to deliver the gas to the first flow channel 55. The pump increases the amount of gas delivered to the first flow channel 55.

In the embodiment shown in FIGS. 2 and 3, the constriction portion 53 and the first cylindrical portion 52 are formed separately. In another embodiment, the constriction restricting portion 53 may be integrally formed with the first cylindrical portion 52. For example, the constriction portion 53 may protrude from the inner peripheral surface of the first cylindrical portion 52 defining the first flow passage 55.

The spray nozzle 5 cuts off and miniaturizes the gas delivered to the first flow channel 55 by the cleaning liquid flowing in the first flow channel 55 to generate a mixed fluid MF (cleaning liquid containing fine bubbles in the inside). In addition, the spray nozzle 5 sprays the mixed fluid MF generated in the spray nozzle 5 from the spray port 51.

Fig. 4 is a diagram schematically showing the vicinity of the part where the spray nozzle is fixed in the absorption tower, and is a diagram for explaining the first expansion joint and the second expansion joint.

In some embodiments, the above-mentioned gas-liquid mixing device 4 is provided with the above-mentioned first cylindrical part 52, the above-mentioned constriction part 53 and the above-mentioned second cylindrical part 54 as shown in FIGS. 2 and 3. In addition, the above-mentioned gas-liquid mixing device 4 further includes an expansion pipe joint 45 provided in at least one of the above-mentioned cleaning liquid introduction line 41 and the above-mentioned gas-liquid introduction line 42 as shown in FIG. 4.

As shown in FIG. 4, the telescopic pipe joint 45 includes a main body 451, which defines an introduction channel 455 for transporting cleaning liquid or gas inside, and is configured to be flexible at least along the direction in which the introduction channel 455 extends.

In the illustrated embodiment, as shown in FIG. 4, the introduction channel 455 and the main body 451 of the telescopic pipe joint 45 extend along the direction in which the axes CE1 and CE2 extend. In addition, the telescopic pipe joint 45 includes a downstream fastening portion 453 which extends from the outer periphery of one side end (downstream end) in the extension direction of the main body 451 along a direction perpendicular to the extension direction of the main body 451 And the upstream fastening portion 454, which protrudes from the outer periphery of the other end (upstream end) in the extension direction of the main body 451 along the direction orthogonal to the extension direction of the main body 451. The expansion tube joint 45 is provided with an expansion bladder 452 having elasticity or flexibility in the middle of the main body 451. The telescopic tube joint 45 provided with the bellows 452 in the main body 451 is stretchable along the direction in which the introduction channel 455 extends, and is freely stretchable along the direction orthogonal to the direction in which the introduction channel 455 extends.

According to the above configuration, the gas-liquid mixing device 4 includes the expansion pipe joint 45 provided in at least one of the cleaning liquid introduction line 41 or the gas introduction line 42 and the injection nozzle 5. The telescopic pipe joint 45 includes a main body 451, which defines an introduction channel 455 for transporting cleaning liquid or gas inside, and is configured to be flexible at least along the extending direction of the introduction channel 455. The gas-liquid mixing device 4 is designed to absorb the contraction caused by vibration or heat by the expansion pipe joint 45, so that at least one of the self-cleaning liquid introduction line 41 or the gas introduction line 42 can be prevented from transmitting the vibration or heat to the spray nozzle 5. Caused to shrink. Since the two orthogonal directions (the direction in which the central axis CA extends and the direction in which the central axis CA2 extends) can be prevented from being superimposed and transmitted to the injection nozzle 5 from contraction caused by vibration or heat, it is possible to suppress the wear and tear of the injection nozzle 5 damage. In addition, according to the above configuration, since the expansion pipe joint 45 is removed from the cleaning fluid introduction line 41, the inspection of the constriction section 53 can be performed without disassembling the piping of the cleaning solution introduction line 41 on the upstream side of the expansion pipe joint 45. Therefore, , The above-mentioned inspection work can be carried out quickly.

In some embodiments, as shown in FIG. 4, the aforementioned telescopic pipe joint 45 is provided in both the cleaning liquid introduction line 41 and the gas introduction line 42. In other words, the aforementioned expansion joint 45 includes a first expansion joint 45A provided on the cleaning liquid introduction line 41 and a second expansion joint 45B provided on the gas introduction line. In this case, since the telescopic pipe joint 45 is provided on both the cleaning liquid introduction line 41 and the gas introduction line 42, it is possible to prevent the transmission of vibration or vibration from both the cleaning liquid introduction line 41 and the gas introduction line 42 to the spray nozzle 5 Shrinkage caused by heat. According to the above configuration, compared with the case where the telescopic pipe joint 45 is provided in at least one of the cleaning liquid introduction line 41 or the gas introduction line 42, it is possible to more reliably prevent the injection nozzle 5 from being superimposed on each of the two orthogonal directions. The contraction caused by vibration or heat is transmitted, and since the first expansion pipe joint 45A is removed from the cleaning fluid introduction line 41, and the second expansion pipe joint 45B is removed from the gas introduction line 42, the self-absorption tower 2 can be removed quickly Operation of spray nozzle 5.

Figure 5 is a partial cross-sectional view schematically showing the vicinity of the fixed spray nozzle in the absorption tower. Hereinafter, based on FIG. 5, the installation method of the spray nozzle 5 will be described.

First, the end of the first cylindrical portion 52 in which the ejection port 51 of the ejection nozzle 5 is formed is inserted into the insertion hole 252 formed so as to penetrate the first side wall 25.

As shown in FIG. 5, the spray nozzle 5 includes a discharge port side fastening portion 63. The first cylindrical portion 52 extends along the central axis CA of the ejection port 51, and the ejection port 51 is formed at one end in the extending direction. The ejection port side fastening portion 63 protrudes from the outer periphery of the first cylindrical portion 52 in a direction orthogonal to the center axis CA of the ejection port 51. The ejection port-side fastening portion 63 is provided on the outer periphery of the first cylindrical portion 52 on the downstream side in the flow direction of the cleaning liquid than the connection portion with the second cylindrical portion 54 or the merging portion 60.

As shown in FIG. 5, the absorption tower 2 further contains the cylindrical protrusion part 29 and the fastening part 30 for injection nozzles. As shown in FIG. 5, when the inclination angle between the central axis CA of the ejection port 51 and the horizontal plane is set to θ, the cylindrical protrusion 29 penetrates from the first side wall 25 along the direction inclined by the inclination angle θ from the horizontal plane. The peripheral edge of the hole 252 protrudes outward. The fastening portion 30 for the spray nozzle protrudes from the end of the cylindrical protrusion 29 in a direction orthogonal to the direction in which the cylindrical protrusion 29 extends.

Next, the spray nozzle 5 is fixed to the first side wall 25. The ejection outlet side fastening portion 63 of the ejection nozzle 5 is fixed to the ejection nozzle fastening portion 30 of the absorption tower 2 by a fastening device 66 (66A). In the illustrated embodiment, the fastening device 66A (second fastening device) includes a bolt 67 (67A) and a nut 68 (68A).

The bolt 67 (67A) includes a shaft portion 671 in which a threaded portion is formed on at least a part of the outer peripheral surface, and a head portion 672 in which the base end of the shaft portion 671 is formed to have a larger diameter than the shaft portion 671. The ejection port side fastening portion 63 and the ejection nozzle fastening portion 30 are formed with through holes 631 and 301 along the direction in which the cylindrical protrusion 29 extends, through which the shaft portion 671 of the bolt 67A can be inserted. In the bolt 67A, the shaft portion 671 is inserted from one side of the direction in which the cylindrical protrusion 29 extends to the through holes 631, 301 formed in the ejection port-side fastening portion 63 and the ejection nozzle fastening portion 30, and is inserted to The end of the shaft 671 on the other side of the direction in which the cylindrical protrusion 29 extends is screwed with the nut 68A, thereby fixing the spray nozzle 5 to the first side wall 25.

After fixing the spray nozzle 5 to the first side wall 25, the gas introduction line 42 is connected to the spray nozzle 5. In the illustrated embodiment, as shown in FIG. 5, the injection nozzle 5 further includes a gas introduction side fastening portion 64 protruding from the outer periphery of the end of the second cylindrical portion 54 where the second gas introduction port 59 is formed. As shown in Fig. 4, the gas introduction line 42 includes: a gas introduction pipe 47 connected to the upstream side of the second cylindrical portion 54; the aforementioned second expansion pipe joint 45B, which is connected to the upstream side of the gas introduction pipe 47; And the second gas introduction pipe 49 is connected to the upstream side of the second expansion pipe joint 45B.

As shown in FIG. 4, the gas introduction pipe 47 includes: a gas downstream side fastening portion 48 (refer to FIG. 5), which protrudes from the outer periphery of the downstream side end where the opening communicating with the second gas introduction port 59 is formed; and The gas upstream side fastening portion 472 is provided to protrude from the outer periphery of the upstream side end portion. The second gas introduction pipe 49 includes a second gas downstream side fastening portion 491 protrudingly provided from the outer periphery of the downstream side end portion.

The gas downstream side fastening portion 48 of the gas introduction pipe 47 is fixed to the gas introduction side fastening portion 64 of the injection nozzle 5 by the fastening device 66 (66B). In the illustrated embodiment, the fastening device 66B includes a bolt 67B, which has the same structure as the bolt 67A, and a nut 68B, which has the same structure as the nut 68A. The bolt 67B is inserted into the through holes 641 and 481 formed in the gas introduction side fastening portion 64 and the gas downstream side fastening portion 48 at the end of the shaft portion 671 and screwed with the nut 68B to fix the gas introduction tube 47 to the jet The second cylindrical portion 54 of the mouth 5.

As shown in FIG. 4, the second expansion pipe joint 45B fixes the downstream side fastening portion 453 (453B) to the gas upstream side fastening portion 472 of the gas introduction pipe 47 by the fastening device 66 (66E). The device 66 (66F) fixes the upstream fastening portion 454 (454B) to the second gas downstream fastening portion 491 of the second gas introduction pipe 49. In the illustrated embodiment, the fastening devices 66E and 66F include bolts and nuts similarly to the fastening device 66B.

After fixing the spray nozzle 5 to the first side wall 25, the cleaning liquid introduction line 41 is connected to the spray nozzle 5. The connection between the cleaning liquid introduction line 41 and the spray nozzle 5 can be performed at the same time as the connection between the gas introduction line 42 and the spray nozzle 5, or before or after the connection between the gas introduction line 42 and the spray nozzle 5.

As shown in FIG. 5, the spray nozzle 5 further includes a cleaning liquid introduction side fastening portion 65 protruding from the outer periphery of the end of the first cylindrical portion 52 where the cleaning liquid introduction port 56 is formed. As shown in FIG. 4, the cleaning liquid introduction line 41 includes the above-mentioned first expansion pipe joint 45A connected to the upstream side of the first cylindrical portion 52, and a cleaning liquid introduction pipe connected to the upstream side of the first expansion pipe joint 45A 46. The cleaning liquid introduction pipe 46 includes a cleaning liquid downstream side fastening portion 461 protruding from the outer periphery of the downstream end portion.

As shown in FIG. 5, the 1st expansion pipe joint 45A fixes the downstream side fastening part 453 (453A) to the cleaning liquid introduction side fastening part 65 of the spray nozzle 5 by the fastening device 66C (1st fastening device). In the illustrated embodiment, the fastening device 66C includes a bolt 67C, which has the same structure as the bolt 67A, and a nut 68C, which has the same structure as the nut 68A. The bolt 67C is inserted into the through holes 651, 456 formed in the cleaning fluid introduction side fastening portion 65 and the downstream side fastening portion 453 (453A) at the end of the shaft portion 671 and the nut 68C is screwed to the first cylinder The first telescopic tube joint 45A is fixed to the first cylindrical part 52 of the spray nozzle 5 in a state where the constriction restricting part 53 is sandwiched between the shaped part 52 and the first telescopic tube joint 45A.

As shown in FIG. 4, the first expansion pipe joint 45A fixes the upstream fastening portion 454 (454A) to the cleaning liquid downstream fastening portion 461 of the cleaning liquid introduction pipe 46 by the fastening device 66 (66D). In the illustrated embodiment, the fastening device 66D includes bolts and nuts similarly to the fastening device 66C.

In the illustrated embodiment, as shown in FIG. 4, the angle at which the central axis CA of the ejection port 51 is inclined from the horizontal plane is set to θ, and the angle at which the axis CE1 of the first expansion joint 45A is inclined from the horizontal plane is set to θ1 When the inclination angle θ1 is within the range of θ±5°. That is, the axis CE1 of the first telescopic pipe joint 45A extends in a direction parallel to the central axis CA of the ejection port 51. In this case, it is possible to reduce the resistance when the cleaning liquid is sent from the first expansion joint 45A to the first cylindrical portion 52. In addition, in another embodiment, the aforementioned θ1 may be outside the aforementioned range of θ±5°. Moreover, in the illustrated embodiment, as shown in FIG. 4, the second expansion joint 45B is located above the first expansion joint 45A.

As described above, in some embodiments, as shown in FIG. 5, the above-mentioned spray nozzle 5 is provided with the above-mentioned cleaning liquid introduction side fastening portion 65, which is compared with the second cylindrical portion 54 from the first cylindrical portion 52 The connecting portion or the merging portion 60 is protrudingly provided on the upstream side of the flow direction of the cleaning liquid on the outer periphery of the end where the cleaning liquid inlet 56 is formed. The aforementioned first telescopic pipe joint 45A includes the aforementioned downstream side fastening portion 453A, which protrudes from the outer periphery of the end portion of the main body portion 451 in a direction intersecting the direction in which the axis CE1 of the aforementioned first telescopic pipe joint 45A extends. The downstream fastening portion 453A is configured to be fixed downstream by a fastening device 66C (first fastening device) in a state in which the constriction portion 53 is sandwiched between the first telescopic pipe joint 45A and the first cylindrical portion 52 Side fastening part 453A.

According to the above-mentioned configuration, the downstream side fastening portion 453A of the first expansion joint 45A is sandwiched between the first expansion joint 45A and the first cylindrical portion 52 by the fastening device 66C. (First fastening device) The cleaning liquid introduction side fastening part 65 fixed to the spray nozzle 5. Since the first telescopic pipe joint 45A is directly fixed to the spray nozzle 5, it can effectively absorb the shrinkage caused by the vibration or heat from the cleaning liquid introduction line 41.

The exhaust gas desulfurization device 1 of some embodiments includes the above-mentioned absorption tower 2 and the above-mentioned gas-liquid mixing device 4. According to the above-mentioned configuration, the absorption tower 2 is configured such that the cleaning liquid and the exhaust gas introduced into the inside are brought into gas-liquid contact, and the liquid collecting part 21B for storing the cleaning liquid is defined inside. The gas-liquid mixing device 4 can produce a sufficient oxidation reaction to the cleaning liquid stored in the liquid collecting part 21B of the absorption tower 2 by spraying the mixed fluid MF from the spray outlet 51 of the spray nozzle 5 to the liquid collecting part 21B of the absorption tower 2 . In addition, according to the above-mentioned structure, since the shrinkage caused by vibration or heat can be prevented from being superimposed and transmitted to the injection nozzle 5 from two directions orthogonal to each other, the abrasion or damage of the injection nozzle 5 can be suppressed.

In some embodiments, the above-mentioned injection nozzle 5 (gas-liquid mixing device 4) includes the above-mentioned first cylindrical part 52 and the above-mentioned discharge port side fastening part 63. In addition, the aforementioned absorption tower 2 includes the aforementioned cylindrical projection 29 and the aforementioned nozzle fastening portion 30.

According to the above configuration, in a state where the end of the first cylindrical portion 52 including the ejection port 51 is inserted into the insertion hole 252 formed in the side wall (first side wall 25 etc.) of the absorption tower 2, the fastening device 66A (second fastening device) fixes the ejection port side fastening portion 63 of the injection nozzle 5 (gas-liquid mixing device 4) to the injection nozzle fastening portion 30 of the absorption tower 2. Since the injection nozzle 5 is fixed to the absorption tower 2, even if both the cleaning liquid introduction line 41 and the gas introduction line 42 transmit the contraction due to vibration or heat to the injection nozzle 5, it can prevent the ejection port 51 of the injection nozzle 5 from falling The position or angle is shifted to reduce the oxidation reaction of the mixed fluid MF sprayed from the spray nozzle 5 to the cleaning liquid.

Furthermore, according to the above-mentioned configuration, the first cylindrical portion 52 extends along the central axis CA of the ejection port 51. The cylindrical protrusion 29 of the absorption tower 2 extends in a direction inclined from the horizontal plane at the same angle as the angle θ at which the central axis CA of the ejection outlet 51 is inclined from the horizontal plane. That is, the cylindrical protrusion 29 of the absorption tower 2 extends in the same direction as the central axis CA of the ejection port 51 when the first cylindrical portion 52 is provided. The first cylindrical portion 52 is fixed by the fastening device 66A along the ejection port side fastening portion 63 extending in the direction orthogonal to the direction in which the first cylindrical portion 52 extends, and extends along the cylindrical protrusion 29 The fastening portion 30 for the spray nozzle extending in the direction orthogonal to the direction of the spray nozzle can directly use the angle θ at which the central axis CA of the spray port 51 is inclined from the horizontal plane as the installation angle. Therefore, according to the above-mentioned structure, the work of adjusting the installation angle of the first cylindrical portion 52 is unnecessary, and the installation work of the first cylindrical portion 52 can be facilitated.

The present invention is not limited to the above-mentioned embodiment, but also includes a form in which the above-mentioned embodiment is changed or a form in which these forms are appropriately combined.

For example, in some of the above-mentioned embodiments, the exhaust gas discharge portion 24 is provided on the opposite side of the exhaust gas introduction portion 23 with the absorption tower main body portion 22 interposed in the first direction, but it may be provided in the same manner as the exhaust gas introduction portion 23. side. Moreover, the exhaust gas discharge part 24 may be provided so that it may be adjacent to the absorption tower main body part 22 in the 2nd direction orthogonal to the 1st direction in plan view.

1: Exhaust desulfurization device 2: Absorption tower 4: Gas-liquid mixing device 5: Jet nozzle 7: Cleaning fluid circulation line 8: Cleaning fluid supply line 9: Cleaning fluid discharge line 21: Internal space 21A: Gas-liquid contact part 21B: Liquid Collection 21C: Lower inner space 21D: Upper internal space 22: Absorption tower body 23: Exhaust introduction part 24: Exhaust discharge part 25: 1st side wall 26: 2nd side wall 27: Demister 28: Spreading device 29: cylindrical protrusion 30: Fastening part for nozzle 41: Cleaning fluid introduction line 42: Gas introduction line 44: Branch 45: Expansion pipe joint 45A: 1st expansion pipe joint 45B: 2nd expansion pipe joint 46: Cleaning fluid inlet pipe 47: Gas inlet pipe 48: Gas downstream side fastening part 49: The second gas introduction pipe 51: spout 52: The first cylindrical part 53: Restriction 54: The second cylindrical part 55: first runner 56: Cleaning fluid inlet 57: Gas inlet 58: 2nd runner 59: Second gas inlet 60: Confluence Department 61: Contraction flow forming mouth 62: negative pressure area 63: Fastening part on the outlet side 64: Gas inlet side fastening part 65: Washing fluid introduction side fastening part 66: Fastening device 66A～66F: Fastening device 67A～67C: Bolt 68A～68C: Nut 71: Piping 72: Cleaning fluid circulation pump 73: Branch 81: Cleaning fluid storage tank 82: Piping 91: device 211: Bottom 251: Exhaust inlet 252: Through hole 261: Exhaust outlet 262: Secret 281: Sprinkler Pipe 282: Sprinkler nozzle 301: Through hole 451: Main Body 452: bellows 453: Downstream fastening part 453A: Downstream side fastening part 453B: Downstream side fastening part 454: Upstream fastening part 454A: Upstream fastening part 454B: Upstream fastening part 455: Import runner 456: through hole 461: Downstream fastening part of cleaning fluid 472: Gas upstream side fastening part 481: Through hole 491: 2nd gas downstream side fastening part 631: Through hole 641: Through hole 651: Through hole 671: Shaft 672: head CA: The central axis of the nozzle CA2: Central axis of gas inlet CE1: The axis of the first expansion pipe joint CE2: The axis of the second expansion pipe joint G: gas MF: Mixed fluid θ: tilt angle θ1: Tilt angle

Fig. 1 is a cross-sectional view showing a schematic configuration of an exhaust gas desulfurization device according to an embodiment. Fig. 2 is a schematic cross-sectional view of a spray nozzle for explaining the function of the spray nozzle of an embodiment. Fig. 3 is a cross-sectional view showing the schematic configuration of an injection nozzle according to an embodiment. Fig. 4 is a diagram schematically showing the vicinity of the part where the spray nozzle is fixed in the absorption tower, and is a diagram for explaining the first expansion joint and the second expansion joint. Figure 5 is a partial cross-sectional view schematically showing the vicinity of the fixed spray nozzle in the absorption tower.

4: Gas-liquid mixing device

5: Jet nozzle

25: 1st side wall

29: cylindrical protrusion

41: Cleaning fluid introduction line

42: Gas introduction line

45: Expansion pipe joint

45A: 1st expansion pipe joint

45B: 2nd expansion pipe joint

46: Cleaning fluid inlet pipe

47: Gas inlet pipe

49: The second gas introduction pipe

52: The first cylindrical part

53: Restriction

54: The second cylindrical part

66A~66F: Fastening device

451: Main Body

452: bellows

453: Downstream fastening part

453A: Downstream side fastening part

453B: Downstream side fastening part

454: Upstream fastening part

454A: Upstream fastening part

454B: Upstream fastening part

455: Import runner

461: Downstream fastening part of cleaning fluid

472: Gas upstream side fastening part

491: 2nd gas downstream side fastening part

CA: The central axis of the nozzle

CE1: The axis of the first expansion pipe joint

CE2: The axis of the second expansion pipe joint

θ: tilt angle

θ1: Tilt angle

Claims (5)

A gas-liquid mixing device comprising an injection nozzle configured to store the cleaning liquid in an absorption tower constructed in such a way that the cleaning liquid and exhaust gas discharged from the combustion device are in gas-liquid contact The liquid collecting part sprays oxygen-containing gas and the above-mentioned cleaning liquid; and The above spray nozzle has: The first cylindrical portion defines a first flow path inside, and is formed with a cleaning liquid inlet for introducing the cleaning liquid to the first flow path, and is used to guide the cleaning liquid along the direction relative to the cleaning liquid inlet The gas is introduced into the gas inlet of the first flow channel in a direction orthogonal to the flow direction of the cleaning liquid flowing in the first flow channel, and the cleaning liquid introduced from the cleaning liquid inlet is ejected from the cleaning liquid. The jet port of the mixed fluid of the above gas introduced by the gas inlet; A constriction part, which is arranged on the upstream side of the flow direction of the cleaning liquid than the confluence part where the cleaning liquid introduced from the cleaning liquid inlet and the gas introduced from the gas inlet merge; and The second cylindrical portion defines a second flow passage communicating with the gas inlet and is formed to introduce the gas to the second flow in a direction orthogonal to the flow direction of the cleaning liquid The second gas inlet of the road; The gas-liquid mixing device further includes: The telescopic pipe joint includes a main body that is configured to extend and retract at least along the direction in which the introduction channel extends, and is provided for At least one of the cleaning liquid introduced from the cleaning liquid inlet to the cleaning liquid introduction line of the first flow channel, or the gas introduction line used to transport the gas from the second gas inlet to the second flow channel By. Such as the gas-liquid mixing device of claim 1, where The expansion joint is provided in both the cleaning liquid introduction line and the gas introduction line. Such as the gas-liquid mixing device of claim 1 or 2, where The spray nozzle further includes: a cleaning liquid introduction side fastening portion protruding from the outer periphery of the first cylindrical portion on the upstream side in the flow direction of the cleaning liquid than the confluence portion; and The first expansion pipe joint, which is the expansion pipe joint provided on the cleaning fluid introduction line, further includes: a downstream side fastening portion from the main body portion in a direction intersecting the direction in which the axis of the first expansion pipe joint extends The outer circumference is protruding, and the constriction is sandwiched between the first telescopic pipe joint and the first cylindrical part, and fixed to the cleaning liquid introduction side fastening part by the first fastening device . An exhaust gas desulfurization device, which is used to desulfurize exhaust gas discharged from a combustion device, and has: An absorption tower, which is configured to make the cleaning liquid come into gas-liquid contact with the exhaust gas introduced into the interior, and a liquid collecting part for storing the cleaning liquid is defined inside; and The gas-liquid mixing device of any one of claims 1 to 3. Such as the exhaust gas desulfurization device of claim 4, where The first cylindrical portion extends along the central axis of the ejection port, The injection nozzle further includes: an ejection port side fastening portion that extends from the outer periphery of the first cylindrical portion on the downstream side of the flow direction of the cleaning liquid than the confluence portion and is aligned with the center axis of the ejection port The direction of intersection is prominently set; and The above absorption tower further includes: A side wall, which delimits at least a part of the liquid collecting part, and is formed with an insertion hole through which the end of the first cylindrical part including the ejection port is inserted; Cylindrical projection, when the angle at which the central axis of the ejection port is inclined from the horizontal plane is set to θ, along the direction inclined from the horizontal plane at the same angle as the inclination angle θ, from the peripheral edge of the insertion hole of the side wall The part protrudes toward the outer side of the side wall; and The fastening portion for the injection nozzle is one that protrudes from the end of the cylindrical protrusion in a direction orthogonal to the direction in which the cylindrical protrusion extends, and is configured to be fixed to the above by a second fastening device The fastening part on the ejection port side.

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