JP2016068030A - Spray nozzle and gas-liquid contactor comprising the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spray nozzle that is disposed in a gas-liquid contactor or the like for recovering harmful substances by bringing, for example, air containing harmful substances into contact with a liquid for absorbing the harmful substances, and that prevents clogging and sprays liquid more efficiently, and thereby improves contact efficiency with air and the like.SOLUTION: A spray nozzle 12 comprises: a pipe 12a for downward flowing a liquid; and a collision plate 12b for colliding and spraying the liquid passing through the pipe 12a. In the spray nozzle, an inner diameter of the pipe 12a is 20 mm to 30 mm, the collision plate 12b is disposed at an angle of 30 to 60 degrees to a central axis of the pipe 12a, and the liquid is sprayed at a flow rate of 45 L/min to 55 L/min. In the spray nozzle 12, it is preferable that a slit is formed on a tip portion of the pipe 12a, in parallel to the collision plate 12b. Further, it is preferable that the collision plate 12b is fan-shaped with the central axis of the pipe 12a as the center.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a spray nozzle and a gas-liquid contact device provided with the spray nozzle.

  For example, a packed tower known as a gas-liquid contact device is a gas (gas) containing a toxic substance from the bottom to the top by filling the inside of the tower with a packing, spraying the liquid onto the packing from the top of the tower. An apparatus is known in which a gas is absorbed into a liquid by countercurrent flow. However, when dust is contained in the gas, clogging may occur. Therefore, it is necessary to provide a dust collecting device in front of the packed tower.

  Venturi scrubbers that perform dust collection and absorption operations by introducing gas at high speed in parallel with the liquid from the top have a large pressure loss of the gas. A shelf having a hole with an aperture ratio of 15 to 30% is provided inside the tower, liquid is supplied from the top of the tower, gas is sent from the bottom of the tower, and the gas and liquid are brought into contact with each other in the hole of the shelf so that the gas becomes liquid. The perforated plate tower to be absorbed needs to be a large apparatus like the packed tower, and it is necessary to provide a dust collector in front of the tower.

  In addition, a jet scrubber that arranges a liquid spray nozzle in a gas nozzle to perform high-pressure spraying, performs pressure increase and gas-liquid mixing, and performs dust collection and absorption operations requires a high pressure, so that the power cost increases. There is.

  In order to solve the conventional problems such as these, the present applicant, as disclosed in Patent Document 1, has a liquid film forming nozzle formed by providing a liquid film forming plate obliquely with respect to a pipe. Proposal of a gas-liquid contact device comprising a first gas-liquid contact portion arranged to form a film and a second gas-liquid contact portion having a liquid dispersion member that causes a turbulent flow in the gas doing. According to this gas-liquid contact device, the pressure loss of the liquid and gas is small, clogging with dust does not occur, and the contact efficiency between the gas and the liquid can be further increased.

  More specifically, in the gas-liquid contact apparatus shown in Patent Document 1, as one of the feature points, a plurality of liquid film forming nozzles each composed of a pipe and a liquid film forming plate are provided at the top of the apparatus tower. The liquid for contact and mixing is supplied by spraying. In the liquid film forming nozzle, the liquid film forming plate is provided obliquely facing the opening of the pipe, and the liquid that has passed through the pipe is collided with the liquid film forming plate (collision plate). A liquid film swelled on both sides from the opening end of the pipe as shown in FIG. 1 is formed, and the formed liquid film without gaps is surely brought into contact with the introduced gas. In such a gas-liquid contact device, the introduced gas can flow down along the liquid film to be gas-liquid mixed, so that the pressure loss of the gas is prevented and the power consumption required for gas movement is small. Have.

  However, even in the gas-liquid contact device as shown in Patent Document 1, it is required to further improve the contact efficiency between the gas and the liquid and increase the processing efficiency of the gas containing harmful substances.

JP 49-99964 A

  The present invention has been made in view of such a conventional situation. For example, a gas-liquid contact device that recovers a harmful substance by bringing a gas containing the harmful substance into contact with a liquid for absorbing the harmful substance. An object of the present invention is to prevent clogging in a spray nozzle that can be applied to, etc., and to spray liquid more effectively, for example, to improve the contact efficiency with gas, etc. And

  The inventors of the present invention have made extensive studies in order to solve the above-described problems. As a result, in a spray nozzle having a pipe that causes liquid to flow down and a collision plate that collides and sprays the liquid that has passed through the pipe, a pipe having a predetermined inner diameter is used, and the installation angle between the pipe and the collision plate It was found that when the liquid was sprayed at a specific flow rate by setting the value in a predetermined range, the liquid could be sprayed in a cleaner spray state, and the present invention was completed. That is, the present invention provides the following.

  (1) A first invention according to the present invention is a spray nozzle including a pipe for causing a liquid to flow down and a collision plate for causing the liquid that has passed through the pipe to collide and spray, the inner diameter of the pipe being 20 mm. The collision plate is provided at an angle of 30 degrees to 60 degrees with respect to the central axis of the pipe, and the liquid is sprayed at a flow rate of 45 L / min to 55 L / min. It is a spray nozzle.

  (2) A second invention according to the present invention is the spray nozzle according to the first invention, wherein a notch is formed in a tip portion of the pipe in parallel with the collision plate.

  (3) A third invention according to the present invention is the spray nozzle according to the first or second invention, wherein the collision plate has a fan-shaped shape centering on a central axis of the pipe.

  (4) A fourth invention according to the present invention includes a gas inlet provided at the top of the tower, and a spray nozzle that sprays liquid arranged in an annular shape around the gas inlet, A first gas-liquid contact portion that makes the gas supplied and the liquid supplied from the spray nozzle contact, and a first gas-liquid contact portion that communicates with the first gas-liquid contact portion and is provided vertically. A cylindrical second gas-liquid contact part having a venturi structure connected thereto, a gas-liquid separation part separating gas and liquid discharged from the lower end of the second gas-liquid contact part, and the first A gas discharge unit provided around the gas-liquid contact unit and configured to discharge the gas separated by the gas-liquid separation unit from a gas discharge port provided at an upper portion, and the spray nozzle A pipe that flows down, and a collision plate that collides and sprays the liquid that has passed through the pipe. The inside diameter of 20Mm～30mm, a gas-liquid contact apparatus, characterized in that the impact plate is provided at an angle of 30 degrees to 60 degrees with respect to the central axis of the pipe.

  According to the spray nozzle of the present invention, clogging can be prevented and liquid can be sprayed more effectively in a clean spray state. For example, when provided in a gas-liquid contact device, the contact efficiency with gas is improved. It becomes possible to improve.

It is sectional drawing which shows an example of a structure of the gas-liquid contact apparatus which concerns on this invention. It is a schematic diagram for demonstrating the magnitude | size of a gas-liquid contact apparatus and each structure. It is a figure for demonstrating the specific shape of a spray nozzle, (A) is side surface sectional drawing, (B) is a downward view of a part of spray nozzle. It is sectional drawing which shows a part of spray nozzle. It is a figure for demonstrating the shape of the collision board with which the spray nozzle was equipped.

  Hereinafter, the spray nozzle according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment, A various change is possible in the range which does not change the summary of this invention.

<< 1. Outline of the present invention >>
The spray nozzle according to the present invention is a spray nozzle provided with a pipe that causes liquid to flow down and a collision plate that collides and sprays the liquid that has passed through the pipe. This spray nozzle can be provided, for example, in a gas-liquid contact device that collects harmful substances by bringing a gas containing the harmful substances into contact with a liquid for absorbing the harmful substances.

  In this spray nozzle, the inner diameter of the pipe is 20 mm to 30 mm, the collision plate is provided at an angle of 30 degrees to 60 degrees with respect to the central axis of the pipe, and the liquid is 45 L / min to 55 L / It is characterized by spraying at a flow rate of min.

  According to such a spray nozzle, clogging can be prevented and liquid can be sprayed more effectively in a clean spray state. Therefore, as described above, when applied to, for example, a gas-liquid contact device, the contact efficiency with the introduced gas can be improved, and the processing efficiency of the gas containing harmful substances can be improved. it can.

  Hereinafter, the spray nozzle according to the present invention will be described in more detail with reference to a specific embodiment (hereinafter referred to as “the present embodiment”). In addition, this invention is not limited to the following embodiment, A various change is possible in the range which does not change the summary of this invention.

≪2. Gas-liquid contact device >>
First, prior to specific description of the spray nozzle according to the present embodiment, a gas-liquid contact device to which this spray nozzle is applied will be described. The spray nozzle is not limited to the application of a gas-liquid contact device as will be described later, and can be used for other devices that spray and supply liquid.

  According to the spray nozzle according to the present embodiment, for example, in a gas-liquid contact device for collecting a harmful substance by bringing a gas containing the harmful substance into contact with a liquid for absorbing the harmful substance. By providing, the contact efficiency of the liquid sprayed and supplied from the spray nozzle and the introduced gas can be improved, and the gas containing harmful substances can be processed more efficiently and effectively.

  FIG. 1 is a cross-sectional view showing an example of a gas-liquid contact device according to the present embodiment. As shown in FIG. 1, a gas-liquid contact device 1 includes a gas inlet 11 provided at the top of a tower, and a spray nozzle 12 arranged in an annular shape around the gas inlet 11 to spray and supply a liquid. A first gas-liquid contact portion 10 having a cylindrical shape in which the first gas-liquid contact portion 10 communicates with the first gas-liquid contact portion 10 and is vertically provided, and the connection portion 20A with the first gas-liquid contact portion 10 has a venturi structure. Second gas-liquid contact part 20, a gas-liquid separation part 30 that separates the gas and liquid discharged from the lower end of the second gas-liquid contact part 20, and the periphery of the second gas-liquid contact part 20 The gas discharge part 40 which discharges | emits the gas isolate | separated in the gas-liquid separation part 30 from the gas discharge port 41 provided in the upper part is provided. Each configuration will be specifically described below.

[First gas-liquid contact part]
The first gas-liquid contact part 10 is provided with a gas inlet 11 at the top of the tower, and is provided with a spray nozzle 12 arranged in an annular shape around the gas inlet 11 to supply liquid. Yes. In the first gas-liquid contact portion 10, a gas (gas) X containing a harmful substance such as SO ₂ , HCl, Cl ₂ , NH ₃ , NO _x is introduced from the gas inlet 11, and the gas inlet 11 is brought into contact with the liquid (absorbing liquid) flowing out from the spray nozzles 12 arranged around 11 and mixed. More specifically, the spray nozzle 12 is a nozzle for forming a liquid film, and the gas X flowing down from the gas inlet 11 reliably collides with a liquid film having no gap formed by the liquid from the spray nozzle 12. Then, it is mixed with the liquid.

  The spray nozzle 12 includes a pipe 12a and a collision plate 12b. The spray nozzle 12 is a nozzle for forming a liquid film as described above, and the collision plate 12b is provided at the opening end of the pipe 12a obliquely with respect to the central axis of the pipe 12a. In this manner, by providing the collision plate 12b obliquely at a predetermined angle with respect to the pipe 12a, a liquid film having no gaps can be formed, and the liquid film having a shape rising from the opening end of the pipe 12a on both sides can be formed. The gas X can be brought into contact with certainty. Moreover, according to such a spray nozzle 12, clogging by the dust etc. which are contained in the liquid to supply can be prevented, and a liquid can be supplied stably.

  Note that. The more specific shape and size of the spray nozzle 12 and the flow rate of the liquid supplied from the spray nozzle 12 will be described in detail later.

[Second gas-liquid contact part]
The second gas-liquid contact portion 20 is a cylindrical component member that communicates with the first gas-liquid contact portion 10 and is provided vertically, and constitutes a throat portion. The second gas-liquid contact unit 20 mixes the introduced gas X and the liquid supplied from the nozzle 12 in the first gas-liquid contact unit 10 following the first gas-liquid contact unit 10 described above. Cooling, dust collection, absorption, etc.

  The second gas-liquid contact part 20 has a venturi structure at a connection part (an inlet part of the second gas-liquid contact part 20) 20A with the first gas-liquid contact part 10. Since the second gas-liquid contact portion 20 is a cylindrical member having the vent portion 20A as described above, the liquid flowing out from the spray nozzle 12 is introduced as fine droplets. The gas X and the liquid droplet can be efficiently contacted.

  The second gas-liquid contact portion 20 can be provided with a liquid dispersion member 21 inside the cylindrical tube. Specifically, a cross partition plate can be provided inside the cylinder as the liquid dispersion member 21. Further, as the liquid dispersion member 21, a plurality of plate-like members may be provided in a spiral shape along the inner surface inside the cylinder. Thus, by providing the liquid dispersion member 21 inside the cylinder, the liquid flowing down from above can be more efficiently dispersed inside the second gas-liquid contact portion 20. Moreover, a turbulent flow can be generated in the gas A, and the contact efficiency with the droplet can be further enhanced.

  Further, the second gas-liquid contact portion 20 can be provided with a net 22 such as an expanded metal at a position below the throat at a right angle to the passage direction of the gas X.

  The gas-liquid contact device 1 has a structure in which a gas discharge unit 40 is provided around the second gas-liquid contact unit 20. A gas component (a gas component from which harmful substances have been removed) separated by a gas-liquid separation unit 30 described later rises in the gas discharge unit 40 and is discharged from a gas discharge port 41 provided on the upper side. That is, the gas component after gas-liquid separation passes through the gas discharge unit 40 to a position corresponding to the upper part of the second gas-liquid contact unit 20 and is discharged to the outside through the gas discharge port 41. It has become.

[Gas-liquid separation unit]
In the gas-liquid separation unit 30, the gas X and the liquid discharged from the lower end of the second gas-liquid contact unit 20 are separated. Specifically, while separating the gas and the liquid containing the harmful substance brought into contact with each other at the first gas-liquid contact part 10 and the second gas-liquid contact part 20, and storing the liquid to which the harmful substance has transferred. The gas-liquid separated gas X ′ is transferred to the gas discharge unit 40 described later.

  A liquid discharge port 31 for discharging the liquid separated from the gas is provided at the bottom of the gas-liquid separation unit 30, and when a predetermined amount of liquid is stored in the gas-liquid separation unit 30, the liquid is discharged. Is discharged through the liquid discharge port 31. In addition, the liquid discharged | emitted from the liquid discharge port 31 contains a harmful substance, and is transferred to a predetermined purification facility etc. and processed.

  A stirring device such as a stirring blade may be provided near the bottom of the gas-liquid separation unit 30. By providing the stirring device, for example, dust in the liquid can be prevented from accumulating on the bottom of the tank.

[Gas discharge part]
The gas discharge part 40 is a donut-shaped component member provided around the second gas-liquid contact part 20. Therefore, as shown in FIG. 1, the general view of the gas-liquid contact device 1 has a substantially cylindrical shape extending from the top of the first gas-liquid contact unit 10 to the bottom of the gas-liquid separation unit 30. There is no.

  The gas discharge part 40 is provided with a gas discharge port 41 in the upper part thereof, and the gas X ′ (gas from which harmful substances have been removed) X ′ separated from the liquid by the gas-liquid separation part 30 is generated by the upward flow. The inside of the discharge part 40 is raised, and it has a structure discharged | emitted from the gas discharge port 41 provided in the upper part. The gas X ′ separated from the liquid rises in the gas discharge section 40 by being sucked from the gas discharge port 41 by a suction device or the like, and is discharged from the gas discharge port 41. Yes.

  Specifically, the gas discharge port 41 is an upper portion of the gas discharge unit 40, and as shown in the cross-sectional view of FIG. 1, near the bottom of the first gas-liquid contact unit 10, the second gas-liquid contact unit 20. Is provided at a position corresponding to the vicinity of the upper side of. In the gas-liquid contact device 1, the gas discharge port 40 having such a gas discharge port 41 provided at the upper portion can increase the residence time of the separated gas X ′ in the gas-liquid contact device 1. .

  In the conventional gas-liquid contact device, the gas X and the liquid that are brought into contact with each other are separated by the gas-liquid separation unit, and then the separated gas (exhaust gas) X ′ is discharged from an outlet provided in the gas-liquid separation unit. Had been discharged through. However, when exhaust gas X ′ is discharged, liquid components (components containing harmful substances) may be taken out together with the exhaust gas X ′, reducing the recovery rate of harmful substances contained in the introduced gas X It was a cause. Therefore, conventionally, in order to prevent the liquid component from being taken out, for example, it is necessary to install a member such as a mist separator immediately before the discharge port and take measures to collect the liquid component.

  On the other hand, according to the gas-liquid contact device 1, the gas X separated by the gas-liquid separation unit 30 with the gas discharge unit 40 provided at a position corresponding to the periphery of the second gas-liquid contact unit 20. 'Can be discharged through the gas discharge portion 40 in an upward flow. Accordingly, the residence time of the separated gas can be increased until the gas is discharged from the gas discharge port 41 provided in the upper portion of the gas discharge unit 40, and the liquid component is prevented from being taken out together with the gas. be able to. That is, while the gas is rising and moving in the gas discharge unit 40, the liquid component falls and is removed from the gas X ′, and only the gas X ′ that does not contain harmful substances is present. The gas is discharged from the gas outlet 41. As a result, it is possible to suppress a decrease in the recovery rate of harmful substances, and it is not necessary to install a member such as a mist separator.

  It is preferable that the gas discharge port 41 is provided at a position as high as possible in the vertical direction in the gas discharge unit 40. More specifically, when the gas discharge port 41 in the gas discharge unit 40 is viewed from a cross-sectional view of the gas-liquid contact device 1 (see FIG. 1), for example, the height position is the same as the first gas-liquid contact unit 10. It is preferably provided in the vicinity of a position corresponding to the position of the connecting portion with the second gas-liquid contact portion 20 (an inlet portion having a venturi structure of the second gas-liquid contact portion 20) 20A. Accordingly, the residence time of the gas X ′ can be further increased, and the liquid component containing harmful substances can be more effectively prevented from being taken out.

  Further, as shown in the cross-sectional view of FIG. 1, the gas discharge part 40 is provided so as to surround the periphery of the second gas-liquid contact part 20 having the venturi structure, and the gas-liquid contact. Since the entire device 1 is formed in a cylindrical shape, a simple configuration can be achieved without increasing the size of the outer shape (installation area) as compared with the conventional gas-liquid contact device.

[Gas-liquid contactor and size of each component]
In addition, as a magnitude | size of the gas-liquid contact apparatus 1 which concerns on this Embodiment, it does not specifically limit, It can set suitably according to the quantity etc. of the gas to process (introduce). For example, the size of the gas-liquid contact device 1 and the size of each component of the gas-liquid contact device 1 are set so that the in-tank wind speed of the gas X is about 1.7 m / s depending on the desired gas flow rate. Can be determined.

Specifically, for example, when the in-tank wind speed of the introduced gas X is about 1.7 m / s, the outer diameter D of the gas-liquid contact apparatus 1 shown in the schematic diagram in FIG. Assuming that Qm ³ / s, the size can be calculated by D = (4 × Q / π / 1.7) ^ 0.5. And in the gas-liquid contact apparatus 1, the magnitude | size of the height direction of H1 and H3 shown in FIG. 2, ie, the 1st gas-liquid contact part 10 and the gas-liquid separation part 30, is 0.5 times-0 of the external form D-0. About 6 times (for example, H1 = H3 = 0.55 × D). Further, H2 shown in FIG. 2, that is, the size in the height direction of the gas discharge unit 40 is about 1.2 to 1.6 times the outer shape D (for example, H2 = 1.5 × D). it can.

  Furthermore, the diameter (D1 shown in FIG. 2) of the inlet of the throat part constituting the second gas-liquid contact part 20 is about 0.25 to 0.30 times the outer diameter D of the gas-liquid contact part 1 (for example, D1 = 0.26 × D), and the outlet diameter of the throat portion (D2 shown in FIG. 2) is about 0.35 to 0.40 times the outer diameter D of the gas-liquid contact portion 1. (For example, D1 = 0.37 × D).

  Thus, the magnitude | size of the gas-liquid contact apparatus 1 and the magnitude | size of each structure of the gas-liquid contact apparatus 1 can be determined with the air volume of the gas X to introduce | transduced, and the wind speed in a tank.

≪3. Spray nozzle >>
Next, the spray nozzle 12 provided in the gas-liquid contact apparatus 1 mentioned above is demonstrated.

  FIG. 3 is a cross-sectional view showing an example of a specific shape of the spray nozzle 12 according to the present embodiment. As shown in FIG. 3, the spray nozzle 12 includes a pipe 12 a that causes the liquid to flow down, and a collision plate 12 b that causes the liquid that has passed through the pipe 12 a to collide and spray.

[About pipes]
The pipe 12a is a member that allows liquid to be supplied into the first gas-liquid contact portion 10 in the gas-liquid contact device 1 described above, and has a cylindrical shape. The length of the pipe 12a in the major axis direction is not particularly limited, and can be appropriately set according to the size of the gas-liquid contact device 1 to be installed, a desired liquid flow rate, and the like. It can be about 350 mm.

  The spray nozzle 12 is characterized in that the inner diameter of the pipe 12a is in the range of 20 mm to 30 mm.

  Here, in the spray nozzle 12, the flow rate of the liquid supplied by spraying is 45 L / min to 55 L / min, and it is more preferable that the flow rate is about 50 L / min. If the inner diameter of the pipe 12a is less than 20 mm at such a liquid spray flow rate, dust or the like is likely to be accumulated in the pipe 12a, causing a clogging, and the liquid in the gas-liquid contact device 1 is effectively removed. Can not supply. On the other hand, when the inner diameter of the pipe 12a exceeds 30 mm, the liquid to be supplied is not neatly sprayed, for example, dripping dripping and dripping, and a gas containing harmful substances introduced in the gas-liquid contact device 1 Reduce contact efficiency. Therefore, by setting the inner diameter of the pipe 12a in the range of 20 mm to 30 mm, clogging can be prevented, the liquid can be nebulized, and the contact efficiency with the gas containing harmful substances can be further improved. it can.

  Moreover, it is preferable that the notch is formed in the front-end | tip part of the pipe 12a. Specifically, as shown in a partial cross-sectional view of the spray nozzle 12 in FIG. 4, a cut is formed at the tip of the pipe 12a (a location indicated by “A” in FIG. 4). As will be described later, it is preferably formed so as to be parallel to the collision plate 12b provided obliquely with respect to the pipe 12a.

  Thus, since the notch is formed in the tip of the pipe 12a in parallel with the collision plate 12b, the distance until the liquid hits the collision plate 12b after coming out of the pipe 12a becomes uniform, and passes through the pipe 12a. The liquid can be neatly sprayed into the gas-liquid contact device 1 so that all the liquid effectively collides with the collision plate 12b. Thereby, contact efficiency with the gas containing the introduced harmful substance in the gas-liquid contact device 1 can be further improved.

[About collision plate]
The collision plate 12b is for colliding and spraying the liquid that has passed through the pipe 12a, and is provided at the opening end of the pipe 12a obliquely with respect to the central axis of the pipe 12a. The collision plate 12b is joined to the pipe 12a by a joining member 12c.

  Specifically, the collision plate 12b is characterized by being provided at an angle of 30 degrees to 60 degrees with respect to the central axis of the pipe 12a. The collision plate 12b is more preferably provided at an angle of 45 degrees with respect to the central axis of the pipe 12a. When the collision plate 12b is provided at an angle of less than 30 degrees with respect to the pipe 12a, the liquid flowing out from the pipe 12a does not effectively hit the collision plate 12b and is not neatly sprayed. Reduces contact efficiency with gases containing introduced harmful substances. On the other hand, when the collision plate 12b is provided at an angle exceeding 60 degrees with respect to the pipe 12a, the liquid flow from the pipe 12a is delayed and clogging occurs.

  In addition, the joining member 12c that joins the pipe 12a and the collision plate 12b has a similar angle so that the collision plate 12b is reliably joined to the pipe 12a at a desired angle of 30 to 60 degrees. It is made up of.

  Further, the shape of the collision plate 12b is not particularly limited, but it is preferable that the collision plate 12b has a sector shape centered on the central axis of the pipe 12a. Here, FIG. 5 (A) shows an enlarged front view of a portion of the spray nozzle 12 where the collision plate 12b is provided. As shown in FIG. 5 (A), when the collision plate 12b is provided in a fan shape centered on the central axis of the pipe 12a, for example, a substantially rectangular collision plate is provided (FIG. 5 ( For the sake of convenience, the liquid flowing out from the pipe 12a is desired as compared with the pipe in FIG.5 (B) as “pipe 12a ′” and the collision plate as “impact plate 12b ′”. It can be sprayed stably in the spraying range. In addition, the spray range can be expanded.

  As a result, the liquid can be sprayed more neatly and stably, and the liquid can be stably sprayed. Therefore, the contact efficiency with the gas containing harmful substances introduced in the gas-liquid contact device 1 is improved. It can be improved further. Moreover, since the liquid can be sprayed stably, the amount of introduction of the gas X containing a harmful substance can be made constant, and a stable treatment operation can be performed.

DESCRIPTION OF SYMBOLS 1 Gas-liquid contact apparatus 10 1st gas-liquid contact part 11 Gas inlet 12 Spray nozzle 12a Pipe 12b Colliding plate 12c Joining member 20 2nd gas-liquid contact part 20A Connection part 21 Liquid dispersion member 22 Network 30 Gas separation part 31 Liquid outlet 40 Gas outlet 41 Gas outlet

Claims (4)

A spray nozzle comprising a pipe that causes liquid to flow down and a collision plate that collides and sprays the liquid that has passed through the pipe,
The inner diameter of the pipe is 20 mm to 30 mm,
The collision plate is provided at an angle of 30 to 60 degrees with respect to the central axis of the pipe;
A spray nozzle characterized by spraying the liquid at a flow rate of 45 L / min to 55 L / min.   The spray nozzle according to claim 1, wherein a notch is formed in a tip portion of the pipe in parallel with the collision plate.   The spray nozzle according to claim 1 or 2, wherein the impingement plate has a fan shape centered on a central axis of the pipe. A gas inlet provided at the top of the tower; and a spray nozzle that sprays and supplies a liquid in an annular shape around the gas inlet, the introduced gas and the liquid supplied from the spray nozzle A first gas-liquid contact portion to be contacted;
A cylindrical second gas-liquid contact portion provided in a vertical communication with the first gas-liquid contact portion, wherein the connection portion with the first gas-liquid contact portion has a venturi structure;
A gas-liquid separation unit that separates gas and liquid discharged from the lower end of the second gas-liquid contact unit;
A gas discharge part provided around the second gas-liquid contact part and for discharging the gas separated by the gas-liquid separation part from a gas discharge port provided in the upper part;
The spray nozzle is
A pipe to let the liquid flow down,
A collision plate that collides and sprays the liquid that has passed through the pipe;
The inner diameter of the pipe is 20 mm to 30 mm,
The gas-liquid contact device, wherein the collision plate is provided at an angle of 30 degrees to 60 degrees with respect to the central axis of the pipe.

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