JP2003220354A - Spray nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spray nozzle which can reduce the size of spray particles and, at the same time, for example, in the case of the provision of the spray nozzle for cooling exhaust gas within a cooling tower in exhaust gas treatment equipment of a refuse incinerator, can reduce a production cost despite its structure that can solve a problem of a high tendency toward moistening of dust in exhaust gas. <P>SOLUTION: A liquid flow passage 2 is provided in a nozzle body 1, and, in addition, a predetermined number of jetting ports 3 in communication with the liquid flow passage 2 are provided dispersively at the front end part of the nozzle body 1 around an axial center O of the nozzle body 1. A plurality of gas flow passages 4, which are in communication with the liquid flow passage 2 from its external side in the radial direction, are provided dispersively in the nozzle body 1 in its part around the liquid flow passage 2. A baffle member 5, that collides with a gas-liquid mixture which flows through the liquid flow passage 2 to atomize the gas-liquid mixture, is provided in a liquid flow passage part between a predetermined number of jetting ports 3 and the front opening part of the plurality of gas flow passages 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a spray nozzle.

[0002]

2. Description of the Related Art A spray nozzle is provided, for example, as an exhaust gas cooling means in a temperature reducing tower in an exhaust gas treatment facility of a refuse incinerator.

The atomizing nozzle provided in the temperature reducing tower cools the exhaust gas in the temperature reducing tower by the spray particles. When the dust in the exhaust gas is moistened by the spray particles, wet dust is sprayed. Clog the nozzle's jet,
Due to the problem that water droplets are easily generated, the spray particles become a size that exceeds the allowable range in the cooling of the exhaust gas, and wet dust accumulates on the downstream side of the temperature reducing tower, and this wet dust is generated. As it grows, the volume of the desuperheater itself decreases, which makes it impossible to efficiently flow the exhaust gas, which causes a problem that the exhaust gas treatment equipment cannot operate normally.

Therefore, in order to prevent the dust in the exhaust gas from getting wet, it is necessary to provide a spray nozzle having a structure capable of making the spray particles as small as possible in the temperature reducing tower.

As a spray nozzle capable of making atomized particles into fine particles, conventionally, an air passage along the axis of the nozzle body is formed on the side of the axis of the nozzle body, and the flow of water along the axis of the nozzle body is formed on the nozzle body. A path is provided to surround the air flow path,
There has been a spray nozzle configured to atomize atomized particles by causing the air from the air channel to collide with the liquid flowing in the liquid channel and to eject the atomized particles from the ejection port.

[0006]

According to the above-mentioned conventional structure, the air is jetted from the inside toward the water, so the atomized particles are easily miniaturized, but the water flow path is located outside the air flow path. Since it is located, dew condensation occurs on the outer peripheral portion of the nozzle body in the temperature reducing tower, and water droplets easily drip inside the temperature reducing tower body to easily moisten the dust in the exhaust gas.

As a result, the above-mentioned problems, that is, the moist dust clogs the injection port of the spray nozzle and water droplets are easily generated, and the moist dust easily accumulates on the lower end side of the temperature reducing tower. It was difficult to avoid the inconvenience.

In order to solve these problems, Japanese Patent Laid-Open No.
As disclosed in Japanese Unexamined Patent Publication No. 00-107651, a water passage along the axis of the nozzle body is formed on the side of the axis of the nozzle body, and a plurality of injection ports communicating with the water passage are provided in the nozzle body. A plurality of air passages, which are formed at the tip and communicate with the water passage from the outside in the radial direction, are formed by dispersing them around the water passage in the nozzle body, and from the air injection port of the air passage. Also, a spray nozzle has been proposed in which a whirler that swirls water is provided in an upstream water flow path portion, and an orifice that throttles the liquid swirled by the whirler is provided.

According to this structure, the water is swirled by the whirler, the water is made to collide with the blades and the inner wall of the flow passage, and then the water is collided with the wall at the entrance of the orifice through the orifice, and the water is further mixed with the air. Since the particles collide with each other, it is possible to obtain an effect that the atomized particles are more easily miniaturized.

However, in the above construction, since the whirler is for swirling water, the shape is complicated, the number of parts is increased, and the manufacturing cost is increased.

The present invention has been made in view of the above circumstances, and an object thereof is to make atomized particles finer, for example, in the case of being provided as an exhaust gas cooling means in a temperature reduction tower in an exhaust gas treatment facility of a refuse incinerator. Another object of the present invention is to provide a spray nozzle that can reduce the manufacturing cost while having a structure that can easily avoid the problem that dust in exhaust gas is easily moistened.

[0012]

The constitution, operation and effect of the invention according to claim 1 are as follows.

[Structure] A liquid flow path is formed in the nozzle body, and a predetermined number of injection ports communicating with the liquid flow path are formed at the tip of the nozzle body, and the liquid flow path is radially outward. A plurality of gas flow passages communicating from the side are formed in the nozzle body by being dispersed around the liquid flow passage, and a liquid flow between the predetermined number of injection ports and the tip side openings of the plurality of gas flow passages. An obstruction member that obstructs the flow of the gas-liquid mixture flowing through the liquid flow path and atomizes the gas-liquid mixture is provided in the passage portion.

[Operation] [a] The liquid supplied to the liquid passage of the nozzle body is atomized by colliding with the gas jetted from a plurality of gas passages formed in the nozzle body. Since the plurality of gas flow paths are formed so as to communicate with the liquid flow paths of the nozzle body from the radially outer side, the gas-liquid mixture can be easily atomized.

Since the liquid flow path is located closer to the axial center of the nozzle body than the gas flow path is, for example,
When it is provided as an exhaust gas cooling means in the temperature reducing tower of the exhaust gas treatment facility of a refuse incinerator, dew condensation is less likely to occur on the outer peripheral portion of the nozzle body.

Then, the atomized gas-liquid mixture is
It collides with a baffle member provided in the liquid flow path portion between the plurality of ejection ports and the front end side openings of the plurality of gas flow channels, thereby further atomizing and ejecting from the ejection port.

[B] According to the structure of claim 1, a whirler for swirling the liquid, which is required in the prior art, is not required, and the baffle member which can be easily manufactured as compared with the whirler is the liquid passage. It only needs to be installed in.

[Effect] Therefore, the above-mentioned action [a] makes it possible to reduce the size of the spray particles. For example, when the atomized particles are provided as an exhaust gas cooling means in the temperature reduction tower of the exhaust gas treatment equipment of a refuse incinerator, dust in the exhaust gas It was possible to provide a spray nozzle that can reduce the manufacturing cost due to the above action [B] while having a structure in which it is easy to avoid the problem that it becomes easy to moisturize.

The structure, operation and effect of the invention according to claim 2 are as follows.

[Structure] In the structure of the present invention according to claim 1, the baffle member is formed by radially providing a plurality of plate-shaped blades on a central shaft portion along the axis of the liquid flow path. .

[Operation] In addition to the same operation as the operation according to the first aspect, the baffle member is composed of a plurality of plate-like members on the central shaft portion along the axial direction of the liquid flow path. Since the blades are radially provided, the baffle member can be manufactured more easily.

[Effect] Therefore, it becomes easy to obtain the same effect as the effect of the configuration of claim 1.

The structure, operation, and effect of the invention according to claim 3 are as follows.

[Structure] In the structure according to the first aspect of the present invention, in the baffle member, a plurality of liquid receiving bodies positioned side by side in the axial direction of the liquid flow path are arranged such that adjacent liquid receiving bodies are adjacent to each other. The liquid receiving body is integrally provided via a connecting portion in a state of being spaced apart from the liquid receiving body, and the liquid receiving body is provided with a plurality of gas-liquid mixture flow spaces dispersed around the axis of the liquid receiving body. The arrangement phase of the plurality of gas-liquid mixture circulation spaces around the axis of is different from the arrangement phase of the plurality of gas-liquid mixture circulation spaces around the axes of the adjacent liquid receiving bodies.

[Operation] In addition to the same operation as the operation according to the first aspect, the following operation can be performed.

The gas-liquid mixture in the liquid flow passage, which has been atomized by the gas injected from the plurality of gas flow passages, collides with the liquid receiving body on the upstream side of the plurality of liquid receiving bodies, and the liquid receiving body receives the liquid receiving body. It passes through the formed gas-liquid mixture flow space.

Then, it collides with the liquid receiving body on the downstream side in order, passes through the gas-liquid mixture flow space formed in the liquid receiving body, and is ejected from the ejection port.

In this case, the arrangement phase of the plurality of gas-liquid mixture flow spaces around the axis of the liquid receiving body is determined by the arrangement phase of the plurality of gas-liquid mixture flow spaces around the axis of the adjacent liquid receiving bodies. Therefore, the gas-liquid mixture that has passed through the gas-liquid mixture flow space of the upstream liquid receiving body can more reliably collide with the adjacent liquid receiving body on the downstream side.

[Effects] Therefore, in addition to the same effects as the effects according to the constitution of claim 1, the atomized particles can be further miniaturized.

The structure, operation, and effect of the invention according to claim 4 are as follows.

[Structure] In the structure of the invention according to any one of claims 1, 2 and 3, the liquid flow is formed in the inner peripheral wall of the liquid flow path forming hole portion of the nozzle body which forms the liquid flow path. A rear end side of an injection port forming hole portion that forms the injection port is opened in an inner peripheral wall portion along the axis of the passage.

[Operation] The liquid passage forming hole portion of the nozzle body is generally processed by a drill, and the tip end side of the liquid passage forming hole portion is tapered in correspondence with the blade edge angle of the drill. Then, for example, Japanese Patent Laid-Open No. 2000-107651.
As disclosed in FIG. 1 of the drawings of the publication, the rear end side of the injection port forming hole portion forming the injection port is opened to a tapered portion on the front end side of the liquid flow path forming hole portion. I am allowed.

On the other hand, in the structure of claim 4, of the inner peripheral wall of the liquid flow path forming hole of the nozzle body forming the liquid flow path, the inner peripheral wall portion along the axis of the liquid flow path. In addition, since the rear end side of the injection port forming hole portion that forms the injection port is opened, the same operation as the operation according to any one of claims 1, 2 and 3 can be achieved. In addition, the following effects can be achieved.

That is, the liquid supplied to the liquid flow path of the nozzle body collides with the gas jetted from a plurality of gas flow paths communicating with the liquid flow path of the nozzle body from the radially outer side to atomize the liquid. Therefore, the gas-liquid mixture in the liquid flow path is more atomized when it is located closer to the outer periphery of the liquid flow path than when it is closer to the axis of the liquid flow path. .

According to a fourth aspect of the present invention, the structure is such that the rear end side of the injection port forming hole portion is opened to the tapered surface of the tapered portion on the front end side of the liquid channel forming hole portion. than,
Since the opening is located on the outer peripheral side of the liquid channel, it becomes easier to introduce the atomized gas-liquid mixture into the opening.

Further, the gas-liquid mixture portion on the side closer to the axis of the liquid flow path goes straight and collides with the inner wall of the nozzle body on the side of the center of the tip, and the collision causes atomization to proceed to the opening. It becomes easy to enter (in the case of a structure in which the injection port is not formed in the center of the tip of the nozzle body). As a result, both the gas-liquid mixture located closer to the outer periphery of the liquid channel and the gas-liquid mixture closer to the axis of the liquid channel are atomized and then ejected from the ejection port.

[Effect] Therefore, in addition to the same effect as the effect according to any one of claims 1, 2 and 3, the spray particles can be further miniaturized.

[0038]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a spray nozzle device for cooling exhaust gas, which is provided in a temperature reducing tower of an exhaust gas treatment facility in a refuse incinerator. This spray nozzle device includes a spray nozzle 1
0 and an adapter 30 for the water and air supply pipe 20
It consists of and.

As shown in FIG. 2, FIG. 3 and FIG. 4, the spray nozzle 10 is provided on the side of the axis O of the nozzle body 1 with the axis O.
Along with the water flow path 2 is formed, the eight injection ports 3 communicating with the water flow path 2 are connected to the tapered tapered main body portion 1A of the nozzle main body 1 on the tip side of the nozzle main body 1. Axis O
A plurality of air flow paths 4 which are formed by being dispersed around and communicate with the water flow path 2 from the outside in the radial direction thereof in a rearward tilted posture.
Are dispersed and formed around the water flow path 2 in the back constricted tapered main body 1B on the intermediate side in the longitudinal direction of the nozzle main body 1 (see FIG. 5).

At the rear end side of the injection port forming hole portion forming the injection port 3, the water passage is formed in the inner peripheral wall of the water passage forming hole portion of the nozzle body 1 forming the water passage 2. The inner peripheral wall portion 51 is opened along the axis 2 (that is, the axis O of the nozzle body 1).

Then, in the liquid flow path portion between the plurality of ejection ports 3 and the tip side openings of the plurality of air flow paths 4, the water flow path 2 is formed.
A baffle member 5 (see FIGS. 1 and 6) for obstructing the flow of the gas-liquid mixture flowing through and atomizing the gas-liquid mixture is provided.

The baffle member 5 is formed by radially providing eight plate-shaped blades 6 on a central shaft portion 27 along the axis of the water flow path 2 to form the water flow path 2. Nozzle body 1
It is press-fitted into the water flow passage forming hole. The nozzle body 1
Is a hexagonal main body 1C having a hexagonal cross section over a predetermined length behind the tapered main body 1A on the tip side.
The first male screw portion 7 for connecting to the adapter 30 is formed between the hexagonal main body 1C and the tapered rearward tapered main body 1B (having a smaller diameter than the hexagonal main body). There is.

7 and 8A. As shown in FIG. 8B, in the adapter 30, a water passage 37 is formed along the axis P of the adapter body 31 having a hexagonal cross section on the side of the axis P. At the end of each of the second and third male threaded portions on the side of the water and air supply pipe 20, the second female threaded portion 33 having a large diameter and the third female threaded portion 33 having a smaller diameter than that.
A female screw portion 36 is formed, and a fourth female screw portion 32 to be screwed onto the first male screw portion 7 of the nozzle body 1 is formed at the end portion on the downstream side.

Then, the screw hole 22 of the second female screw portion 33
And a plurality of air passages 35 around the water passage 37 in the adapter main body portion between the inner diameter side of the fourth female screw portion 32 and the enlarged diameter hollow portion 34 formed by expanding the inner diameter side. It is formed by being dispersed.

As shown in FIG. 1, the fourth female screw portion 32 is formed.
When the adapter 30 is screwed into the first male screw part 7 of the nozzle body 1 and the spray nozzle 10 is connected, the adapter 3
The expanded hollow portion 34 of 0 and the air passage 4 of the spray nozzle 10 communicate with each other.

The water and air supply pipe 20 has a double cylindrical shape. Water flows through the flow path 23 on the center side and air flows through the flow path 21 between the outer cylinder 28 and the inner cylinder 29.

The second male thread portion and the third male thread portion provided on the tip side of the outer cylinder 28 and the inner cylinder 29 of the supply pipe 20 are connected to the adapter 3
When screwed into the second female thread portion 33 and the third female thread portion 36 provided in No. 0, the flow passage 23 on the center side of the supply pipe 20 becomes the water flow passage 37 of the adapter 30 and the water flow passage 2 of the spray nozzle 10. And the flow path 2 between the outer cylinder 28 and the inner cylinder 29 of the supply pipe 20.
1 is the screw hole 22 of the second female screw portion 33 of the adapter 30.
Communicate with.

With the above structure, the water supplied to the water flow passage 2 of the nozzle body 1 is supplied from the plurality of air flow passages 4 communicating with the water flow passage 2 of the nozzle body 1 from the radially outer side. It collides with the jetted air and is atomized.

Then, the atomized gas-liquid mixture collides with the baffle member 5, whereby it is further atomized and ejected from the ejection port 3.

In the above spray nozzle 10, the baffle member 5 is used.
And an orifice is not formed in the flow path 2 of the water between the injection port forming hole forming the injection port 3. The baffle member 5 has a large opening. Therefore, the water flow path 2
Has the advantage of being easy to maintain.

[Another Embodiment] [1] The baffle member 5 is not limited to the structure of the above embodiment, and may be configured as follows.

1) FIG. 9 (a), FIG. 9 (b), FIG. 9 (c)
As shown in FIG. 7, the blade 6 is formed by sharpening at least one of the front end side and the rear end side of the blade 6 in the side view.

2) As shown in FIGS. 10, 11 and 12, a plurality of water catchers 8 positioned side by side in the axial direction of the water flow path 2 (axial direction of the nozzle body 1) are The water catching bodies 8 which are adjacent to each other are integrally provided through the connecting portion 50 in a state where they are positioned with a space therebetween, and
In addition, a plurality of gas-liquid mixture circulation spaces 25, 26 for circulating the gas-liquid mixture are provided dispersed around the axis Q of the liquid receiving body 8, and a plurality of gases around the axis Q of the water receiving body 8 are provided. The arrangement phase of the liquid mixture distribution space 25 is made different from the arrangement phase of the plurality of gas-liquid mixture distribution spaces 26 around the axis Q of the adjacent liquid receiving bodies 8.

In the embodiment shown in FIG. 10, the space between the respective pieces 40 (or 41) of the cross-shaped water receiving body 8 corresponds to the gas-liquid mixture flow spaces 25, 26 (the respective pieces 40 (or The number of 41) may be 5 or more or 3 or less).

In the embodiment shown in FIGS. 11 and 12, the water receiving body 8 has a disk shape, and the notch (the structure shown in FIG. 11) or the round hole formed in the disk water receiving body 8. (Structure shown in FIG. 12) is the gas-liquid mixture flow space 25, 26.
(The number of notches and round holes is not limited to the numbers shown in FIGS. 11 and 12).

[2] The liquid flowing through the liquid flow path 2 may be a liquid other than water, and the gas flowing through the gas flow path 4 may be a gas other than air.

[3] The spray nozzle according to the present invention is not limited to the spray nozzle device for cooling the exhaust gas provided in the temperature reducing tower of the exhaust gas treatment facility in the refuse incinerator, and the cooling provided in another facility. It can also be applied to a spray nozzle for use. It can also be applied to a spray nozzle used for purposes other than cooling.

[4] The number of the injection ports is not limited to eight, and may be one or a plurality other than eight, for example. In the case of one nozzle, it may be formed at the center of the tip of the nozzle body 1 (on the axis of the nozzle body 1). Further, it may be formed at a position other than the center of the tip portion.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a spray nozzle device.

FIG. 2 is a front view showing a nozzle device.

FIG. 3 is a diagram showing the baffle member.

FIG. 4 is a diagram showing a spray nozzle.

5 is a view taken along line AA in FIG.

FIG. 6 is a view showing a state in which a baffle member is fitted in the nozzle body.
A-A view in

FIG. 7 shows an adapter

FIG. 8 is a front view showing the adapter.

FIG. 9 is a diagram showing another embodiment.

FIG. 10 is a diagram showing another embodiment.

FIG. 11 is a diagram showing another embodiment.

FIG. 12 is a diagram showing another embodiment.

[Explanation of symbols]

1 nozzle body 2 liquid flow paths 3 injection ports 4 gas flow paths 5 Baffle members 6 feathers 8 Liquid receiving body 25,26 Gas-liquid mixture distribution space 27 Central shaft 50 connection 51 Inner peripheral wall portion along the axis of the liquid flow path O Nozzle body axis Q The axis of the receiving body

Claims (4)

[Claims] 1. A liquid flow path is formed in a nozzle body, and a predetermined number of injection ports communicating with the liquid flow path are formed at a tip end portion of the nozzle body, and the liquid flow path is provided on a radially outer side thereof. A plurality of gas flow paths communicating with each other are formed in the nozzle body by being dispersed around the liquid flow path, and a liquid flow path between the predetermined number of ejection ports and the tip side openings of the plurality of gas flow paths. A spray nozzle in which a baffle member that obstructs the flow of the gas-liquid mixture flowing through the liquid flow path and atomizes the gas-liquid mixture is provided in a portion. 2. The spray nozzle according to claim 1, wherein the baffle member is formed by radially providing a plurality of plate-shaped blades on a central shaft portion along the axis of the liquid flow path. 3. The connecting portion in which a plurality of liquid receiving bodies are arranged side by side in the axial direction of the liquid flow path in the baffle member in a state in which adjacent liquid receiving bodies are positioned with a space therebetween. And a plurality of gas-liquid mixture circulation spaces dispersed in the liquid receiving body around the axis of the liquid receiving body, and a plurality of gas liquids around the axis of the liquid receiving body. The spray nozzle according to claim 1, wherein the arrangement phase of the mixture flow space is different from the arrangement phase of the plurality of gas-liquid mixture flow spaces around the axes of the adjacent liquid receiving bodies. 4. An injection port for forming the injection port on an inner peripheral wall portion of an inner peripheral wall of a liquid flow path forming hole portion of the nozzle body forming the liquid flow path, the inner peripheral wall portion extending along an axis of the liquid flow path. The spray nozzle according to claim 1, wherein the rear end side of the forming hole is opened.