JP2012206074A - Fluid atomizing nozzle device and fluid atomizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fluid atomizing nozzle device that can easily install gas piping and liquid piping from the outside even when the installation is performed in a closed space or in a narrow place, and a fluid atomizing device using the fluid atomizing nozzle device.SOLUTION: The fluid atomizing nozzle device 1 includes a gas nozzle part 13 that receives the supply of gas, and a liquid nozzle part 19 that receives the supply of liquid, and atomizes the liquid by the gas. The fluid atomizing nozzle device 1 is provided with a fluid supply pipe part 11 formed by integrating a gas supply pipe part 5 to which gas piping 3 is connected and a liquid supply pipe part 9 to which liquid piping 7 is connected, and the gas nozzle part 13 is attachably/detachably mounted to the tip of the fluid supply pipe part 11.

Description

  The present invention relates to a fluid atomizing nozzle device for atomizing a liquid and a fluid atomizing device using the fluid atomizing nozzle device.

As an example of a fluid atomization nozzle that atomizes a liquid, there is a two-fluid atomization nozzle disclosed in Patent Document 1.
The two-fluid atomization nozzle disclosed in Patent Document 1 is composed of “a liquid supply device, a liquid film formation device, a gas supply device, an air flow swirler, and an outer cylinder. A rotationally symmetric inner peripheral wall surface extending to one circular opening, the airflow swirler is of a radial flow type, and the outer cylinder has a second circular opening concentrically with the first circular opening on a tip wall thereof. Is opened, and a part of the airflow passes through the airflow swirler and flows into the space surrounded by the inner peripheral wall surface of the liquid film forming device as a swirling flow, and flows out of the first circular opening. The channel and the other part of the airflow include a second flow path that ejects from an annular opening between the inner peripheral wall of the second circular opening and the outer peripheral wall of the first circular opening, and a liquid Is ejected from a liquid ejection hole communicating with a liquid reservoir disposed inside the liquid supply device, and is then formed on the inner peripheral wall surface of the liquid film forming device. A cylindrical liquid film is formed in the first circular opening, and the inner periphery is sandwiched by the airflow of the first flow path and the outer periphery is sandwiched by the airflow of the second flow path to be atomized to be atomized. "I tried to do it."

JP 2009-297589 A

  When the gas and liquid are introduced into the nozzle and the liquid is atomized like the two-fluid atomizing nozzle described in Patent Document 1, the gas introduction path and the liquid are introduced to introduce the gas into the nozzle. A liquid introduction path is provided. Then, a gas supply pipe and a liquid supply pipe for supplying gas and liquid from the outside are connected to the gas introduction path and the liquid introduction path. For this reason, the position of the tip of the gas supply pipe or the liquid supply pipe must be accurately matched to the connection part of the gas introduction path and the liquid introduction path on the two-fluid atomization nozzle side.

However, since the gas supply pipe and the liquid supply pipe are generally rigid bodies, it is difficult to accurately match the gas introduction path and the liquid introduction path on the two-fluid atomization nozzle side. This is especially true when the two-fluid atomizing nozzle is installed in a sealed space or a narrow place. For example, when a two-fluid atomizing nozzle is installed in a pipeline, the gas supply pipe and the liquid supply pipe need to penetrate the pipe. Since this penetration portion needs to have pressure resistance and airtightness, for example, welding is performed on the pipe penetration surface. The distance from this weld to the two-fluid atomization nozzle is usually short, and it can be said that there is almost no freedom of the gas supply pipe and the liquid supply pipe constrained by the weld. For this reason, it becomes very difficult to match the front ends of the gas supply pipe and the liquid supply pipe with the connection portions of the gas introduction path and the liquid introduction path on the two-fluid atomization nozzle side.
For this reason, either one of the liquid pipe and the gas pipe is given a degree of freedom, that is, the pipe is made to have a flexible structure. However, in the case of a flexible structure, for example, a bellows structure, the pressure loss becomes large and vibration is likely to occur, so it is necessary to take another measure for preventing vibration.

  The present invention has been made in order to solve the problems of the conventional example, and can easily connect a gas pipe or a liquid pipe from the outside even when installed in a sealed space or a narrow place. It is an object of the present invention to obtain a fluid atomization nozzle device and a fluid atomization device using the fluid atomization nozzle device.

(1) A fluid atomization nozzle device according to the present invention includes a gas nozzle portion that receives supply of gas and a liquid nozzle portion that receives supply of liquid, and fluid atomization nozzle that atomizes the liquid with the gas. The apparatus includes a fluid supply pipe unit in which a gas supply pipe unit to which a gas pipe is connected and a liquid supply pipe unit to which a liquid pipe is connected are integrated, and the gas is provided at a tip of the fluid supply pipe unit. The nozzle part and / or the liquid nozzle part are detachably attached.

(2) Further, in the above-described (1), the gas nozzle portion is an inner cylinder, an inner cylinder disposed in the outer cylinder in a direction coaxial with the outer cylinder and through an inner wall of the outer cylinder and a space. With a cylinder,
The liquid nozzle part is arranged on the upstream end side of the inner cylinder in a state where the gas nozzle part is attached to the fluid supply pipe part.

(3) Further, in the above (2), the relative position of the liquid nozzle portion with respect to the upstream end of the inner cylinder is variable.

(4) The fluid atomization apparatus of the present invention is a fluid atomization apparatus using the fluid atomization nozzle apparatus according to any one of (1) to (3), and is supplied to the fluid atomization nozzle apparatus. And a flow rate adjusting valve for adjusting a flow rate of the gas flowing in the fluid atomizing nozzle device based on a detection value of the flow rate detecting device. Is.

  The fluid atomization nozzle device of the present invention includes a fluid supply pipe unit in which a gas supply pipe unit to which a gas pipe is connected and a liquid supply pipe unit to which a liquid pipe is connected are integrated, and the fluid supply pipe unit Since the gas nozzle part and / or the liquid nozzle part are detachably attached to the tip of the nozzle, if the fluid supply pipe part is inserted into, for example, the mainstream pipe and the nozzle tip part is attached, then the outside of the mainstream pipe It is only necessary to connect the gas pipe to the gas supply pipe part or the liquid pipe to the liquid supply pipe part, and the fluid atomization nozzle device is installed in a sealed space or a narrow place. Also, piping work can be performed very easily.

It is explanatory drawing of the fluid atomization nozzle apparatus which concerns on one embodiment of this invention. It is explanatory drawing of the fluid atomization nozzle apparatus which concerns on one embodiment of this invention. It is explanatory drawing of the gas nozzle part and liquid nozzle part of the fluid atomization nozzle apparatus which concerns on one embodiment of this invention. It is explanatory drawing of the other aspect of the liquid nozzle part of the fluid atomization nozzle apparatus which concerns on one embodiment of this invention. It is explanatory drawing of the other aspect of the liquid nozzle part of the fluid atomization nozzle apparatus which concerns on one embodiment of this invention. It is explanatory drawing of the other aspect of the liquid nozzle part of the fluid atomization nozzle apparatus which concerns on one embodiment of this invention. It is explanatory drawing of the other aspect of the liquid nozzle part of the fluid atomization nozzle apparatus which concerns on one embodiment of this invention. It is operation | movement explanatory drawing of the fluid atomization nozzle apparatus which concerns on one embodiment of this invention. It is explanatory drawing explaining the relationship between the flow rate of the liquid phase and gas phase which flow in a pipe | tube, and a flow mode. It is a graph explaining the relationship between the nozzle pressure loss and the atomization diameter in the fluid atomization nozzle shown in FIG. It is explanatory drawing of the venturi type atomization apparatus which concerns on other embodiment of this invention. It is explanatory drawing of the fluid atomization apparatus which concerns on other embodiment of this invention. It is explanatory drawing of the other aspect of the gas nozzle part and liquid nozzle part which comprise this invention. It is explanatory drawing of the other aspect of the gas nozzle part and liquid nozzle part which comprise this invention.

[Embodiment 1]
The fluid atomization nozzle device 1 according to the present embodiment includes a fluid supply pipe unit in which a gas supply pipe unit 5 to which a gas pipe 3 is connected and a liquid supply pipe unit 9 to which a liquid pipe 7 is connected are integrated. 11, a gas nozzle portion 13 that is detachably attached to the tip of the fluid supply pipe portion 11, and a liquid nozzle portion 19 that is arranged in a predetermined positional relationship with the gas nozzle portion 13.
This will be described in detail below.

<Fluid supply pipe>
The fluid supply pipe part 11 is formed by integrating a gas supply pipe part 5 to which the gas pipe 3 is connected and a liquid supply pipe part 9 to which the liquid pipe 7 is connected.
As an embodiment of the integration, as shown in the present embodiment, the liquid supply pipe 9 is a gas supply pipe in addition to the liquid supply pipe 9 inserted coaxially inside the gas supply pipe 5. It may be provided along the inner surface or the outer surface of the portion 5. Even in this case, for example, if the tip of the liquid supply pipe part 9 is opened coaxially in the gas supply pipe part 5, the tips of the gas supply pipe part 5 and the liquid supply pipe part 9 are the same as in the present embodiment. The arrangement is similar.

[Gas supply pipe section]
The gas supply pipe section 5 has a length that can be inserted into the main flow pipe 15, and the tip thereof opens in the same direction as the main flow pipe 15. A male screw 17 is formed in the opening as shown in FIG. In this embodiment, since it is inserted from the side wall surface of the straight tubular main flow tube 15, the tip end side is bent at a substantially right angle. A straight tubular gas supply pipe 5 may be inserted into the elbow (bent) part of the mainstream pipe 15.

[Liquid supply pipe section]
The liquid supply pipe unit 9 is disposed in the gas supply pipe unit 5 with a relative positional relationship with the gas supply pipe unit 5 determined in advance. As shown in FIG. 2, the tip of the liquid supply pipe part 9 is fixed so as to have a predetermined positional relationship with respect to the tip of the gas supply pipe part 5, and a liquid nozzle part 19 is provided at the tip. ing.

<Gas nozzle part>
The gas nozzle part 13 is detachably attached to the tip of the fluid supply pipe part 11. The gas nozzle part 13 of the present embodiment has a double tube structure including an outer cylinder 25 and an inner cylinder 27 installed in the outer cylinder 25.

[Outer cylinder]
The outer cylinder 25 is supplied with gas from the base end side and ejects gas at the distal end side. The distal end side of the outer cylinder 25 is gradually reduced in diameter toward the center of the outer cylinder, and has a shape similar to a truncated cone.
An internal thread 29 is formed on the inner surface of the outer cylinder 25 on the proximal end side, and is screwed into the distal end of the gas supply pipe portion 5 for attachment.
In addition, the connection method to the gas supply pipe | tube part 5 front-end | tip of the outer cylinder 25 is not limited to a screw, A flange, a clamp coupling, etc. may be sufficient.

[Inner cylinder]
The inner cylinder 27 is disposed in the outer cylinder 25 in the same direction as the outer cylinder 25 and through the inner wall of the outer cylinder 25 and a space. A space formed between the inner wall of the outer cylinder 25 and the outer wall of the inner cylinder 27 forms a ring-shaped flow path 31.
As described above, the distal end side of the outer cylinder 25 is gradually reduced in diameter toward the center of the outer cylinder so as to have a substantially truncated cone shape, so that the cross-sectional area of the ring-shaped channel 31 is on the downstream side. It is getting smaller gradually. By adopting such a shape, the flow velocity of the gas passing through the ring-shaped channel 31 is increased, thereby further promoting the atomization of the liquid.
Further, the inside of the inner cylinder 27 is hollow and forms a central flow path 33. Nothing that blocks the flow path is arranged in the central flow path 33.
The inner base end side of the inner cylinder 27 is a tapered portion 35 that is inclined so as to be reduced in diameter toward the downstream side. The inner surface of the inner cylinder 27 has a tapered portion 35 on the upstream side, but a parallel portion 37 on the downstream side.
The outer surface shape of the inner cylinder 27 is shown in FIGS. 1 to 7 as being composed of a parallel portion and a reduced diameter taper portion, but is not particularly limited thereto.

  Although the inner cylinder 27 is fixed in the outer cylinder 25, the fixing method is not particularly limited, and may be fixed by, for example, a stay (not shown).

<Liquid nozzle part>
As shown in FIG. 4, the liquid nozzle portion 19 may be one in which only the tip of the liquid supply pipe portion 9 is opened, or as shown in FIG. 6 or may be one in which a mesh ring 23 is installed at the tip of the liquid supply pipe portion 9 as shown in FIG. 6, or alternatively as shown in FIG. The structure which gives turning inside the front-end | tip part of the part 9, for example, what has the turning blade | wing 24 may be used.
In addition, when the porous body 21, the mesh ring 23, and the swirl vane 24 are installed at the tip of the liquid supply pipe section 9, they may be detachable.

In the fluid atomization nozzle apparatus 1 of the present embodiment configured as described above, the fluid supply pipe portion 11 is inserted and fixed in the main flow pipe 15, and the outer cylinder 25 is attached to the tip of the gas supply pipe section 5. Install. In the case where the liquid nozzle part 19 is detachable, the liquid nozzle part 19 is attached before the outer cylinder 25 is attached to the gas supply pipe part 5. By attaching the outer cylinder 25 to the tip of the gas supply pipe part 5, the liquid nozzle part 19 installed in the liquid supply pipe part 9 is arranged at a predetermined position in the taper part 35 of the inner cylinder 27.
Then, outside the mainstream pipe 15, an external gas pipe 3 is connected to the gas supply pipe section 5, and an external liquid pipe 7 is also connected to the liquid supply pipe section 9.

As described above, the fluid atomization nozzle device 1 according to the present embodiment includes the fluid supply pipe part 11 having the liquid supply pipe part 9 having the liquid nozzle part 19 at the tip inside the gas supply pipe part 5, Since the fluid atomization nozzle device 1 is configured by connecting the outer cylinder 25 to the tip of the gas supply pipe section 5, the fluid supply pipe section 11 is inserted into the main flow pipe 15 and the outer cylinder 25 is attached. Then, the positional relationship of the nozzle constituent devices is determined, and then the connection of the gas pipe 3 to the gas supply pipe section 5 and the connection of the liquid pipe 7 to the liquid supply pipe section 9 may be performed outside the main flow pipe 15. The effect that the mounting becomes extremely easy is obtained.
Moreover, the effect that replacement | exchange and maintenance at the time of obstruction | occlusion become easy by making the gas nozzle part 13 and the liquid nozzle part 19 removable.

  In the above description, as an aspect in which the gas nozzle portion 13 is attached to the fluid supply pipe portion 11, an example in which the outer cylinder 25 is fixed to the tip of the gas supply pipe portion 5 is shown. The aspect which fixes the part 13 side may be sufficient.

The fluid atomization nozzle device 1 according to the present embodiment attaches the gas nozzle part 13 to the tip of the fluid supply pipe part 11, thereby connecting the liquid nozzle part 19 and the gas nozzle part 13 installed in the liquid supply pipe part 9. The relative position with respect to the inner cylinder 27 is determined.
Therefore, in the following, the relative positional relationship between the liquid nozzle unit 19 and the inner cylinder 27 in a state where the gas nozzle unit 13 is installed in the fluid supply pipe unit 11 will be described.

The positional relationship of the tip of the liquid nozzle part 19 with respect to the inner cylinder 27 may be such that the liquid nozzle part 19 is disposed coaxially with the inner cylinder 27 in the tapered portion 35 of the inner cylinder 27.
By disposing the liquid nozzle portion 19 coaxially with the inner cylinder 27, the flow state in the central flow path of the inner cylinder 27 becomes axisymmetric, which is desirable for uniform atomization.
Further, as shown in FIG. 8, the flow path cross-sectional area (ring-shaped hatched portion) sandwiched between the outer periphery of the liquid nozzle portion 19 and the tapered portion 35 of the inner cylinder 27 is the flow of the parallel portion 37 in the inner cylinder 27. It is desirable to set it to be approximately the same as the road cross-sectional area (elliptical shaded portion). By setting in this way, the flow velocity of the gas in contact with the liquid supplied from the liquid nozzle portion 19 is maintained at the same level as the flow velocity in the parallel portion 11, and the entrainment of the liquid by the gas is ensured.
Note that positioning can be facilitated by making the relative position of the liquid nozzle portion 19 relative to the tapered portion 35 variable. As a method of making it variable, for example, the tip of the liquid supply pipe part 9 to which the liquid nozzle part 19 is attached may have a telescopic structure, for example, so that it can be fixed in a predetermined position so as to be variable in the axial direction. Alternatively, the liquid nozzle portion 19 may be inserted into the liquid supply pipe portion 9 so as to be variable depending on the insertion length.

  In addition, the flow rate ratio of the gas introduced into the inner cylinder and the gas introduced into the ring-shaped flow path 31 is the flow cross-sectional area on the central flow path 33 side and the flow cross-sectional area on the ring-shaped flow path 31 side. Defined by ratio. Therefore, it is desirable to set this ratio in advance suitable for atomization.

The operation of the fluid atomization nozzle apparatus 1 according to the present embodiment configured as described above will be described.
The gas is supplied from the gas supply pipe section 5, and the liquid is supplied from the liquid nozzle section 19 through the liquid supply pipe section 9.
The gas supplied from the gas supply pipe portion 5 flows through the central flow path 33 and the ring-shaped flow path 31 having a double pipe structure formed by the inner cylinder 27 and the outer cylinder 25 at a predetermined distribution ratio. This distribution ratio is defined by the ratio of the channel cross-sectional area on the central channel 33 side and the channel cross-sectional area on the ring-shaped channel 31 side.

The liquid supplied from the liquid nozzle part 19 via the liquid supply pipe part 9 flows in a mixed phase with the gas flowing through the central flow path 33. At this time, various flow forms are taken depending on the flow velocity of the gas flow. When the mixed flow state flowing through the central flow path 33 of the inner cylinder 27 is an annular flow or an annular spray flow, atomization is most favorable, that is, the particle droplet diameter is reduced.
Here, the annular spray flow generated in the central flow path 33 will be described.

FIG. 9 is a diagram (FIG. 9 (a)) showing the relationship between the liquid phase flowing in the pipe and the flow rate of air feeding and the flow pattern, and the flow pattern shown in the diagram is schematically shown. The figure to show (FIG.9 (b)) is shown. The figure shown here is the one described in the book “Gas-liquid two-phase flow” (author: Yasuhiro Ueda, publisher: Yokendo).
As shown in FIG. 9 (a), the liquid phase and the gas phase flowing in the pipe have different flow modes depending on the respective flow rates, but the liquid phase is changed to about 20 m / s or more. An annular spray flow (refer to the lower right figure in FIG. 9 (b)) is an annular flow that flows annularly through the wall, and further, the liquid in the annular liquid phase is entrained and the gas phase is atomized. Become.

  In the present embodiment, the liquid supplied from the liquid nozzle unit 19 flows through the central flow path 33 of the inner cylinder 27 together with the gas flowing through the liquid atomizing nozzle device 1 at a high speed, so that the flow pattern in the inner cylinder 27 is annular. It becomes a spray flow and the liquid is atomized and effectively mixed with the gas. In addition, although the atomization effect of a liquid is acquired also in the state of an annular flow, the effect can be heightened more by setting it as an annular spray flow.

  The liquid supplied from the liquid nozzle portion 19 flows while forming a liquid film on the inner wall surface of the inner cylinder 27 as an annular spray flow. A ring-shaped flow path 31 is also formed on the outer peripheral side of the inner cylinder 27, and gas also flows through the ring-shaped flow path 31. At the outlet portion of the inner cylinder 27, the liquid film formed on the inner wall surface of the inner cylinder 27 is ejected while maintaining the liquid film state in the tube axis direction of the inner cylinder 27. The gas flow that has flowed through the inner cylinder 27 exists inside the liquid film, and the gas flow that has flowed through the ring-shaped flow path 31 exists outside the liquid film. That is, the liquid film is in contact with the gas phase on both the inner and outer surfaces, and the liquid film is torn and atomized by the shearing force resulting from the difference in flow rate between the liquid film and the gas phase.

Thus, by making the gas nozzle part 13 in the fluid atomization nozzle apparatus 1 into the double tube structure, as described above, the liquid atomization is further performed by sandwiching the liquid film-like liquid between the gas flows. Can be promoted.
When the gas flow velocity in the inner cylinder 27 decreases, the annular flow or the annular spray flow state cannot be maintained, and a transition is made to a flow state such as a wavy flow, a slag flow, or a bubble flow. In this case, not only the atomization characteristics in the inner cylinder 27 are deteriorated, but also the state in which the liquid film is sandwiched between the gas flows at the outlet of the inner cylinder 27 cannot be formed, and the atomization performance is drastically lowered.

  Note that the gas phase velocity can be reduced (the gas phase pressure may be small) as long as it is within the range of an annular flow or an annular spray flow. In general, the gas phase apparent flow rate may be maintained at 20 m / s or more. For example, when the apparent gas phase flow velocity is 30 m / s, the theoretical gas phase differential pressure is about 0.5% of the original pressure. For example, when the original pressure is atmospheric pressure (100 kPa (abs)), The required differential pressure is as small as 0.5kPa.

  Since the liquid film is formed by a gas-phase flow, it is not necessary to reduce the cross-sectional area of the liquid-phase flow path for forming the liquid film as in Conventional Example 1, so the liquid-phase flow path can be simple and the cross-sectional area can be increased. The pressure loss on the liquid phase side can be kept small.

The central flow path 33 serving as the gas-phase-side flow path has a substantially straight tube shape and has no obstacles, so that the pressure loss is small.
FIG. 10 shows this point in comparison with the conventional example. The relationship between nozzle pressure loss and atomization performance (atomization diameter) is shown, with the horizontal axis representing nozzle pressure loss and the vertical axis representing atomization diameter. Both the vertical and horizontal axes are dimensionless.
In order to generate droplets having the same diameter 100, the pressure loss of the prior art is more than 100, whereas the nozzle of the present embodiment requires less than 10 pressure loss.
Thus, since the pressure loss is extremely small, even when it is difficult to apply the conventional atomization nozzle due to the low gas-phase supply pressure, this nozzle can be applied. For example, vaporized liquefied natural gas When liquefied petroleum gas is supplied in a liquid state to increase heat and applied to a system that sends it out as city gas, atomization can be performed while suppressing pressure loss. A heat increasing effect can be obtained.

  Further, even when the liquid phase flow rate increases and the liquid cross-sectional area occupying the central flow path 33 increases, the gas phase autonomously diverts to flow more into the ring-shaped flow path 31, and the pressure loss is excessively increased. Can be prevented.

  As described above, according to the present embodiment, good atomization / mixing performance can be obtained while suppressing an increase in pressure loss in both the liquid phase and the gas phase at a low gas phase pressure in a wide liquid phase flow rate range. be able to.

[Embodiment 2]
The present embodiment shows an example of a atomization apparatus using the fluid atomization nozzle apparatus 1 of the present invention, and the city gas is produced by increasing the heat by adding LPG to natural gas obtained by vaporizing LNG. It is used when. Further, in the second embodiment, a venturi tube 39 is installed in the mainstream pipe 15 through which natural gas flows, and the venturi type atomizer 41 is configured.

  As shown in FIG. 11, the basic configuration of the venturi type atomization apparatus 41 according to the present embodiment includes a venturi pipe 39 provided in the main flow pipe 15 through which natural gas flows, and a branch pipe branched from the main flow pipe 15. 43 and a fluid atomization nozzle device 1 installed so that the liquid atomization nozzle device 1 is disposed in the venturi tube 39. The gas supply pipe portion 5 of the fluid atomization nozzle device 1 has a branch pipe 43. The LPG supply pipe 45 for supplying LPG is connected to the liquid supply pipe section 9.

In the venturi type atomization apparatus 41 of the present embodiment, the branch pipe 43 is provided with a flow rate detector 47 for detecting the flow rate of natural gas flowing through the branch pipe 43, and the venturi pipe 39 and the branch pipe 43 in the main flow pipe 15 are provided. A flow rate adjusting valve 49 is provided between the branching portions, and the opening degree of the flow rate adjusting valve 49 is adjusted based on the detection signal of the flow rate detector 47.
Hereinafter, each configuration will be described in detail.

The branch pipe 43 branches from the upstream side of the venturi pipe 39 in the main flow pipe 15, and the outlet side thereof is connected to the gas supply pipe section 5 of the fluid atomization nozzle device 1.
The tip of the liquid atomizing nozzle device 1 is arranged upstream of the venturi throat 51 or the venturi throat 51.

It is the flow velocity in the inner cylinder 27 in the liquid atomization nozzle device 1 that greatly affects the LPG atomization / mixing performance. This is because when the flow rate of the natural gas supplied to the inner cylinder 27 becomes a predetermined flow rate, an annular spray flow including LPG in the inner cylinder 27 is generated, and LPG is atomized and mixed. .
Therefore, the flow path cross-sectional area in the liquid atomization nozzle device 1 can maintain the flow rate of the natural gas flowing through the parallel part 37 at the flow rate necessary for generating the annular spray flow even when the city gas is operated at the lowest flow rate. Keep the diameter as such.
For example, assuming that the fluctuation range of the city gas flow is 300,000 Nm ³ / h to 6,000 Nm ³ / h, when the city gas flow rate is 6,000 Nm ³ / h, which is the lowest flow rate, natural gas is branched. The pipe diameter is set so that the natural gas flow rate of the parallel portion 37 at this time maintains the flow rate necessary for generating the annular spray flow. (At this time, the flow rate of natural gas flowing through the branch pipe 43 is the lowest flow rate assumed as the flow rate of natural gas.)
In addition, if the assumed minimum flow rate is always allowed to flow through the branch pipe 43, controllable and stable LPG atomization / mixing can be realized. In the following description, the minimum flow rate that gives a flow rate necessary for atomization / mixing of LPG in the branch pipe 43 may be referred to as a predetermined value A.

Although the flow rate required for generating the annular spray flow varies depending on the implementation case, it is approximately 20 m / s or more as shown in FIG. Therefore, in the case of the assumed minimum flow rate of the city gas, the flow velocity can be secured at the parallel portion 37 of the inner cylinder 27 of the fluid atomizing nozzle device 1 and a pipe line is formed so that the pressure loss does not become too high. The branch pipe 43 may be set.
The diameter of the venturi throat 51 is designed so that the pressure loss at the maximum design flow rate does not become excessive for the application system.

<Flow detector>
The flow rate detector 47 is provided in the branch pipe 43 and detects the flow rate of natural gas flowing through the branch pipe 43.
Note that a differential pressure detector is provided in place of the flow rate detector 47 and the pressure loss in the branch pipe 43 is detected. You may make it detect the flow volume of the natural gas which flows through.

<Flow control valve>
The flow rate adjusting valve 49 is provided between the venturi pipe 39 and the branch part of the branch pipe 43 in the main flow pipe 15, and adjusts the flow rate of natural gas flowing through the main flow pipe 15 based on the detection signal of the flow rate detector 47. As a result, the flow rate of the natural gas flowing through the branch pipe 43 is set to a predetermined flow rate.
Note that, as shown in FIG. 9A, the gas phase flow rate for making the annular spray flow is affected by the liquid phase flow rate. For this reason, it is also possible to provide a second flow rate detector that detects the amount of LPG flowing through the LPG supply pipe 45, and to calculate and set the predetermined amount of natural gas flowing through the branch pipe 43 in consideration of the supply LPG amount. . However, since the second flow rate detector is required and the control is complicated, practically a constant natural gas flow rate (a flow rate of 20 m / s at the parallel portion 37) is a predetermined amount regardless of the LPG supply amount. Is convenient.

<Description of operation>
Next, the operation of the venturi atomization apparatus 41 according to the present embodiment configured as described above will be described.
The natural gas supplied from the upstream side also flows into the branch pipe 43 when passing through the branch part, and flows into the gas supply pipe part 5 of the fluid atomization nozzle device 1 on the outlet side of the branch pipe 43. The natural gas that has flowed into the gas supply pipe unit 5 entrains the LPG supplied to the liquid nozzle unit 19 and generates an annular spray flow in the parallel part 37 of the inner cylinder 27, whereby the LPG is atomized and mixed, and the venturi pipe It flows into the throat 51.
On the other hand, natural gas flowing through the main flow pipe 15 also flows into the venturi pipe throat 51. Therefore, the natural gas to which LPG has been added via the branch pipe 43 and the natural gas from the main flow pipe 15 flow into the venturi pipe throat portion 51 and pass through the venturi pipe throat portion 51 to further increase the LPG. Mixing is promoted.

The flow rate of city gas increases or decreases depending on the demand. For example, when the demand for city gas decreases and the flow rate of the fluid flowing through the flow path decreases, the total flow rate of natural gas flowing through the branch pipe 43 and the main flow pipe 15 decreases. When the flow rate of natural gas flowing through the branch pipe 43 decreases below the predetermined value A, the flow velocity in the parallel portion 37 decreases, and an annular spray flow is not formed, and there is a concern that LPG atomization / mixing becomes insufficient. .
Therefore, when the flow rate detected by the flow rate detector 47 decreases below the predetermined value A, the flow rate of the natural gas flowing through the branch pipe 43 is maintained at the predetermined value A by reducing the opening of the flow rate adjustment valve 49. .
By maintaining the flow rate of natural gas flowing through the branch pipe 43 at a predetermined value A or more, the flow rate in the parallel portion 37 is maintained, and the effect of atomization / mixing of LPG can be ensured.

Conversely, when the demand for city gas increases and the flow rate of the fluid flowing through the flow path increases, the flow rate of natural gas flowing through the branch pipe 43 and the main flow pipe 15 increases. When the flow rate of natural gas flowing through the branch pipe 43 increases beyond a predetermined amount, the pressure loss increases.
Therefore, when the flow rate detected by the flow rate detector 47 increases above the predetermined value B, the opening amount of the flow rate adjustment valve 49 is increased to increase the amount flowing through the main flow pipe 15, and the natural gas flow rate flowing through the branch pipe 43 is predetermined. The value B is set. Here, there is a relationship of the predetermined value B ≧ the predetermined value A.
By setting the flow rate of natural gas flowing through the branch pipe 43 to a predetermined value A or more and B or less, the flow velocity in the branch pipe 43 is maintained within a predetermined range, and LPG can be sufficiently atomized and mixed, and the pressure loss is excessive. Increase can be prevented.

For example, the simplest control method is a case where the predetermined value A = predetermined value B = [natural gas flow rate at the lowest city gas flow rate (natural gas minimum flow rate)].
As in the previous example, assuming that the fluctuation range of the city gas flow rate is 300,000 Nm ³ / h to 6,000 Nm ³ / h, when the city gas flow rate is 6,000 Nm ³ / h, which is the lowest flow rate, The gas is allowed to flow through the branch pipe 43 at substantially the entire amount, that is, a flow rate of a predetermined value A (= predetermined value B).
When the city gas flow rate is greater than 6,000 Nm ³ / h, the opening of the flow rate adjustment valve 49 is adjusted so that the flow rate measured by the flow rate detector 47 installed in the branch pipe 43 maintains a predetermined value A. The natural gas flow rate increase is increased from the main flow pipe 15 by increasing the flow rate. That is, the natural gas flow rate of the predetermined value A always flows through the branch pipe 43 even if the city gas flow rate varies. By doing so, a flow rate necessary for atomization / mixing is always supplied to the branch pipe 43. Further, the velocity component from the main flow pipe 15 contributes to the direction of further increasing the flow velocity in the venturi pipe throat 51.
In the above description, the predetermined value A is [natural gas flow rate at the minimum city gas flow rate (natural gas minimum flow rate)], but may be simply [minimum city gas flow rate].

  As described above, according to the present embodiment, the natural gas flow rate of the parallel portion 37 in the inner cylinder 27 can be maintained at a predetermined flow rate even when the flow rate flowing through the flow path changes greatly, and the LPG atomization can be achieved. -Mixing effect can be obtained and pressure loss can be prevented from becoming excessively large.

Here, in order to distribute the natural gas flow rate of the predetermined value A to the branch pipe 43 side, the flow rate control valve 49 is narrowed down so that the pressure loss is equal to or higher than the pressure loss on the branch pipe 43 side including the nozzle. There is a need. Therefore, if the pressure loss of the fluid atomization nozzle device 1 disposed at the tip of the branch pipe 43 is large, the pressure loss of the venturi type atomization device 41 as a whole increases, and the gas pressure for sending out as city gas can be maintained. Disappear.
Since the atomization can be performed while suppressing the pressure loss by using the venturi type atomization device 41 of the present invention and the fluid atomization nozzle device 1 of the present invention, it is possible to reliably increase the heat without impairing the gas supply pressure. Can be obtained.

[Embodiment 3]
In the second embodiment, as an example of the fluid atomization apparatus using the fluid atomization nozzle apparatus 1 of the present invention, a venturi pipe 39 is installed in the main flow pipe 15 and the fluid atomization nozzle apparatus is provided in the venturi pipe 39. An example in which 1 is arranged is shown.
However, the fluid atomization apparatus of the present invention is not limited to the arrangement of the liquid atomization nozzle device 1 in the venturi tube 39, and the fluid atomization nozzle device 1 may be directly attached to the gas supply pipe 53.

  FIG. 12 is an explanatory diagram of the fluid atomizer 55 of the present embodiment, and the same reference numerals are given to the same parts as those in FIG. The fluid atomization device 55 of the present embodiment includes a fluid atomization nozzle device 1 installed at an end of a gas supply pipe 53 through which gas flows, and a flow rate for detecting the flow rate of the gas supplied to the fluid atomization nozzle device 1. Based on the detection value of the detection device 57 and the flow rate detection device 57, the flow velocity of the gas flowing in the liquid atomization nozzle device 1 is adjusted so as to be a flow velocity necessary for the gas to entrain the liquid into an annular spray flow. The flow rate adjusting valve 59 is provided.

In the above-described embodiment, the gas nozzle portion 13 has a double tube structure including the outer tube 25 and the inner tube 27, and the liquid nozzle portion 19 is disposed on the upstream end side of the inner tube 27. Although shown, the aspect of the gas nozzle portion and the liquid nozzle portion of the present invention is not limited to this.
For example, as shown in FIG. 13, the gas nozzle part is a gas nozzle part 61 having a thin tube part at the tip part and detachably attached to the tip of the gas supply pipe part 5, and the liquid nozzle part is the liquid supply pipe part 9. It is good also as the liquid nozzle part 63 by which the front-end | tip part is arrange | positioned near the discharge outlet of the gas nozzle part 61, and is attached to the front-end | tip of this.
In the example of FIG. 13, the fluid supply pipe part 11 is shown with the liquid supply pipe part 9 along the outer surface of the gas supply pipe part 5.

  Further, as another aspect of the gas nozzle portion, as shown in FIG. 14, a straight tubular gas nozzle portion 65 in which the gas supply tube 5 is extended, and the liquid nozzle portion can be attached to and detached from the tip of the liquid supply tube portion 9. It is good also as the liquid nozzle part 67 with which it was attached to, and was provided with the perforation in the surrounding wall. In this example, the fluid atomizing nozzle is configured by attaching the liquid nozzle portion 67 to the tip of the liquid supply pipe portion 9.

DESCRIPTION OF SYMBOLS 1 Fluid atomization nozzle apparatus 3 Gas piping 5 Gas supply pipe part 7 Liquid piping 9 Liquid supply pipe part 11 Fluid supply pipe part 13 Gas nozzle part 15 Main flow pipe 17 Male screw 19 Liquid nozzle part 21 Porous body 23 Mesh ring 24 Swirling blade 25 Outer cylinder 27 Inner cylinder 29 Female thread 31 Ring-shaped flow path 33 Central flow path 35 Tapered part 37 Parallel part 39 Venturi pipe 41 Venturi type atomizer 43 Branch pipe 45 LPG supply pipe 47 Flow rate detector 49 Flow control valve 51 Venturi pipe Throat portion 53 Gas supply pipe 55 Fluid atomization device 57 Flow rate detection device 59 Flow rate adjustment valve 61 Gas nozzle portion 63 Liquid nozzle portion 65 Gas nozzle portion 67 Liquid nozzle portion

Claims (4)

A fluid atomization nozzle device that has a gas nozzle part that receives supply of gas and a liquid nozzle part that receives supply of liquid, and atomizes the liquid with the gas,
A fluid supply pipe unit in which a gas supply pipe unit to which a gas pipe is connected and a liquid supply pipe unit to which a liquid pipe is connected are integrated; and the gas nozzle unit and / or the tip of the fluid supply pipe unit A fluid atomizing nozzle device, wherein the liquid nozzle portion is detachably attached. The gas nozzle portion includes an outer cylinder, and an inner cylinder disposed in the outer cylinder in a direction coaxial with the outer cylinder and through an inner wall of the outer cylinder and a space,
2. The fluid atomizing nozzle device according to claim 1, wherein the liquid nozzle portion is disposed on an upstream end side of the inner cylinder in a state where the gas nozzle portion is attached to the fluid supply pipe portion.   The fluid atomizing nozzle device according to claim 2, wherein a relative position of the liquid nozzle portion with respect to an upstream end of the inner cylinder is variable.   A fluid atomization device using the fluid atomization nozzle device according to any one of claims 1 to 3, wherein the flow rate detection device detects a flow rate of gas supplied to the fluid atomization nozzle device, and the flow rate. A fluid atomization apparatus comprising: a flow rate adjusting valve that adjusts a flow velocity of a gas flowing in the fluid atomization nozzle apparatus based on a detection value of the detection apparatus.