JP3029133U - 2-fluid oil sprayer - Google Patents

Abstract

(57) Abstract: Combustion is achieved by making the atomized particle size of oil fine even when the amount of atomized medium with respect to the amount of oil is extremely smaller than that of a conventional two-fluid atomizer. High efficiency,
Also, to provide a two-fluid oil sprayer that can easily take measures against NOx. SOLUTION: The jetting speed when the mixed fluid introduced into the mixing chamber 11 with the amount of the spraying medium equal to or less than 5% by weight of the spraying oil is jetted from the mixing chamber into the atmosphere through the nozzle 14 , So that the sound velocity.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a two-fluid oil atomizer, and in particular, when the amount of atomizing medium (air or steam) (hereinafter simply referred to as “atomizing medium”) with respect to the amount of oil is extremely smaller than that of a conventional two-fluid atomizer. Also, it relates to a two-fluid oil atomizer in which the atomized particle size of oil is made fine.

[0002]

[Prior art]

 The two-fluid atomizer has a merit that the atomized particle size can be made small over a wide load range although it has a relatively simple structure, and is widely used. However, the conventional two-fluid atomizer has a problem that it is not economical because it requires a large amount of high-pressure atomizing medium.

[0003]

[Problems to be solved by the device]

 For this reason, attempts have been made to reduce the amount of spray medium to the amount of oil as much as possible, but if the amount of spray medium is reduced, the Sauter mean spray particle size (hereinafter simply referred to as "spray particle size") SMD is extremely small. However, the unburned loss is increased, the combustion efficiency is reduced, and it is difficult to take measures against NOx.

[0004]

[Problems to be solved by the device]

 The present invention has a high combustion efficiency by making the atomized particle size of oil fine even when the amount of the atomizing medium with respect to the amount of oil is extremely smaller than that of the conventional two-fluid atomizer. , The aim is to provide a two-fluid oil sprayer that can easily take measures against NOx.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the two-fluid oil atomizer of the present invention introduces the mixed fluid into the mixing chamber with the amount of the atomizing medium to 5% by weight or less of the amount of the atomizing oil, and mixes the mixed fluid into the atmosphere through the nozzle. The characteristic feature is that the ejection speed when ejected into the room is set to the speed of sound. In this case, the atomizing medium can be jetted from the inside into the annular gap through which the oil flows, and the oil can be atomized and then introduced into the mixing chamber.

In order to achieve the same purpose, the two-fluid oil atomizer of the present invention is designed so that the mixed fluid introduced into the mixing chamber is 5% by weight or less of the amount of the spray oil and the mixed fluid is mixed in the mixing chamber. It is characterized in that the jet velocity when it is jetted into the atmosphere through a Laval nozzle (a tapered nozzle with a dephasor connected) is supersonic. Also in this case, the atomizing medium can be jetted from the inside into the annular gap through which the oil flows, and the oil can be atomized and then introduced into the mixing chamber.

By the way, the present invention is based on the following findings. That is, the atomized particle size SMD in the two-fluid atomizer has a characteristic that it becomes smaller as the weight ratio QA (weight of atomized medium) / QW (weight of oil) of the atomized medium and oil becomes larger, and the atomized particle size relative to the amount of oil sprayed. When the amount of the medium is small, the atomized particle size SMD becomes large, so that the amount of the atomized medium could not be extremely reduced.

On the other hand, the present inventors have found that, as shown in FIG. 1, the atomizing particle size SMD in the two-fluid atomizer determines the flow velocity V of the atomizing medium in addition to the weight ratio QA / QW of the atomizing medium and oil. Paying attention to the fact that it has the characteristic that it becomes smaller as it gets larger, that is, when the mixed fluid is ejected from the mixing chamber into the atmosphere through a nozzle into the atmosphere, As a result, even when the weight ratio QA / QW between the spray medium and the oil is extremely small (specifically, when the spray medium amount is 5% by weight or less of the spray oil amount), the spray particle size is Oil can be ejected into the atmosphere while maintaining the SMD at a predetermined value. As a result, it is possible to reduce the amount of high-pressure spray medium used while maintaining the characteristics of the two-fluid oil atomizer, which has high combustion efficiency and is easy to take measures against NOx. Conventionally, there is no two-fluid atomizer that makes the flow velocity V of the spray medium sonic or supersonic when the weight ratio QA / QW of the spray medium and oil is extremely small, and the flow velocity V of the spray medium is made sonic or supersonic. The properties of these two-fluid atomizers as they were made were also unknown.

In this case, in order to increase the flow velocity V of the spray medium, that is, to make it sonic or supersonic, in the case of sonic velocity, a nozzle (a straight nozzle or a tapered nozzle) having a normal spray hole is used. It can be achieved, but for supersonic speeds, a Laval nozzle (tapered nozzle with dephasor) must be used.

In addition, by spraying the atomizing medium from the inside into the annular gap through which the oil flows, atomizing the oil, and then introducing it into the mixing chamber, the weight ratio QA / QW between the atomizing medium and the oil can be reduced by the two-fluid atomizer. Even if it is extremely small, it is possible to jet the oil into the atmosphere from the mixing chamber through the nozzle in a state where the oil is sufficiently mixed with the atomizing medium.

[0011]

[Embodiment of device]

 An embodiment of a two-fluid oil sprayer of the present invention will be described below with reference to the drawings.

FIG. 2 shows a first embodiment of the two-fluid oil sprayer of the present invention. This two-fluid oil sprayer is configured to supply a spray medium and oil from one oil hole 13 provided so as to open to the mixing chamber 11 and a plurality of spray medium holes 12 provided so as to surround the oil hole 13. The amount of the atomizing medium is set to 5% by weight or less of the amount of the atomizing oil and introduced into the mixing chamber 11, and the mixed fluid mixed in the mixing chamber 11 is ejected from the inside of the mixing chamber 11 into the atmosphere through the nozzle 14. The jet speed at this time is accelerated to the sonic speed, and the oil is atomized as it passes through the nozzle 14.

FIG. 3 shows a second embodiment of the two-fluid oil sprayer of the present invention. In this two-fluid oil sprayer, a plurality of spray medium holes 22 are opened in an annular gap (oil hole) 23 through which oil is provided so as to open in the mixing chamber 21, and the spray medium is ejected from the inside of the annular gap 23. After atomizing the oil, the oil is introduced into the mixing chamber 21. In this case as well, the amount of the spray medium and the oil is reduced to 5% by weight or less of the amount of the spray oil, and When the mixed fluid mixed in the mixing chamber 21 is injected into the atmosphere from the mixing chamber 21 into the atmosphere through the nozzle 24, the jet speed is accelerated to the sonic speed, and when the oil passes through the nozzle 24, It is configured to be further atomized.

FIG. 4 shows a third embodiment of the two-fluid oil sprayer of the present invention. The two-fluid oil sprayer is configured to supply the spray medium and the oil from one oil hole 33 provided in the mixing chamber 31 and a plurality of spray medium holes 32 provided so as to surround the oil hole 33. The amount of the spray medium is set to 5% by weight or less of the amount of the spray oil and introduced into the mixing chamber 31, and the mixed fluid mixed in the mixing chamber 31 flows from the inside of the mixing chamber 31 to the Laval nozzle 34 (the dephasor is connected to the tapered nozzle. The injection speed of the oil is accelerated to the supersonic speed when it is ejected into the atmosphere through the so-called turbulence), and the oil is atomized as it passes through the Laval nozzle 34.

FIG. 5 shows a fourth embodiment of the two-fluid oil sprayer of the present invention. In this two-fluid oil sprayer, a plurality of spray medium holes 42 are opened in an annular gap (oil hole) 43 through which oil is provided so as to open in the mixing chamber 41, and the spray medium is ejected from the inside of the annular gap 43. In this case, the oil is atomized and then introduced into the mixing chamber 41. In this case as well, the amount of the spray medium and the oil is set to 5% by weight or less of the amount of the spray oil, and Is introduced into the mixing chamber 41, and the mixed fluid mixed in the mixing chamber 41 is discharged from the mixing chamber 41 into the atmosphere through a Laval nozzle 44 (a defocuser is connected to a tapered nozzle). It is configured to accelerate to supersonic speeds and further atomize the oil as it passes through the Laval Nozzle 44.

[0016]

[Effect of device]

 According to the present invention, even when the amount of the atomizing medium with respect to the amount of oil is extremely smaller than that of the conventional two-fluid atomizer, the atomized particle size of the oil can be made fine, which makes it possible to reduce the temperature at high temperature. The combustion state of the flame can be realized, and therefore, there are advantages that the combustion efficiency is high, and the NOx countermeasure can be easily taken. Further, it becomes possible to reduce the amount of high-pressure spray medium used, and it is possible to obtain an economical and highly efficient two-fluid oil sprayer.

Further, by using a Laval nozzle, the ejection speed when ejected into the atmosphere can be accelerated to supersonic speed, and the atomized particle size of oil can be made extremely fine, whereby the above combustion The characteristics such as high efficiency and easy establishment of NOx countermeasures can be further improved.

Further, the atomizing medium is jetted from the inside into the annular gap through which the oil flows to atomize the oil, and then the oil is introduced into the mixing chamber, so that the amount of the atomizing medium with respect to the amount of the oil is the same as that of the conventional two-stream type. Even when the amount is extremely small compared to the atomizer, it is possible to eject the oil into the atmosphere through the nozzle from the mixing chamber in a state where the oil is sufficiently mixed with the atomizing medium, which results in high combustion efficiency and It is possible to further improve characteristics such as easy measures against NOx.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between a weight ratio QA / QW of a spray medium and an oil, a flow velocity V of the spray medium, and a Sauter mean spray particle size SMD.

FIG. 2 is a sectional view showing a first embodiment (internal mixing type sonic nozzle) of the two-fluid oil sprayer of the present invention.

FIG. 3 is a sectional view showing a second embodiment (annular premixing sonic nozzle) of the two-fluid oil sprayer of the present invention.

FIG. 4 is a sectional view showing a third embodiment (internal mixing type Laval nozzle) of the two-fluid oil sprayer of the present invention.

FIG. 5 is a sectional view showing a fourth embodiment (annular premixing type Laval nozzle) of the two-fluid oil sprayer of the present invention.

[Explanation of symbols]

 11 Mixing Chamber 12 Spraying Medium Hole 13 Oil Hole 14 Nozzle 21 Mixing Chamber 22 Spraying Medium Hole 23 Annular Gap (Oil Hole) 24 Nozzle 31 Mixing Chamber 32 Spraying Medium Hole 33 Oil Hole 34 Laval Nozzle 41 Mixing Chamber 42 Spraying Medium Hole 43 Annular gap (oil hole) 44 Laval nozzle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Ohara 13-22 Rokuriso-cho, Ashiya-shi, Hyogo Prefecture Ashiya University

Claims (4)

[Scope of utility model registration request] 1. A jet speed at which a mixed fluid, which is introduced into a mixing chamber with a spray medium amount of 5% by weight or less of the spray oil amount and is mixed, is jetted from the mixing chamber into the atmosphere through a nozzle,
A two-fluid oil sprayer characterized by having a sonic speed. 2. The two-fluid oil sprayer according to claim 1, wherein the spray medium is jetted from the inside into the annular gap through which the oil flows to atomize the oil, and then the oil is introduced into the mixing chamber. 3. A jetting speed at which the mixed fluid introduced into the mixing chamber with the amount of the spraying medium being 5% by weight or less of the amount of the spraying oil is mixed into the atmosphere through the Laval nozzle from the mixing chamber. , Characterized by supersonic speed 2
Fluid oil atomizer. 4. The two-fluid oil sprayer according to claim 3, wherein the spray medium is jetted from the inside into the annular gap through which the oil flows to atomize the oil, and then the oil is introduced into the mixing chamber.