JPH0563658U - Two-fluid injection nozzle - Google Patents

Abstract

(57) [Summary] [Purpose] The particle size can be made sufficiently small to enable uniform spraying. [Composition] Air is jetted into the mixing chamber 4a from the air jet port 1a of the air nozzle cylinder 1 along the axial direction of the tip side, and water is introduced into this air from the water chamber 2a at the outer peripheral portion through the throttle hole 12a. In the air / water injection nozzle that supplies and stirs and mixes waste and air in the mixing chamber 4a and sprays from the injection port 5 at the tip of the mixing chamber 4a, four or more throttle holes 12a are formed at regular intervals in the circumferential direction, A mixing plate 12 having a plurality of mixing through holes 12a was provided near the injection port 5 on the tip side of the mixing chamber 4a. [Effect] Water is uniformly dispersed and sent to the mixing chamber, and the mixed fluid in the mixing chamber is remixed before being jetted to achieve atomization.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a two-fluid injection nozzle used for lowering the temperature of exhaust gas by atomizing atomized liquid (water) by an atomizing medium (air) and spraying the atomized liquid (water), such as a temperature control tower of a refuse incinerator.

[0002]

[Prior Art]

 A conventional two-fluid jet nozzle, for example, an air / water jet nozzle will be described with reference to FIGS.

Reference numeral 1 is an air nozzle cylinder arranged along the axis C, and an air ejection port 1b communicating with the air chamber 1a is formed at the axial center position, and its tip end face is directed toward the air ejection port 1b. It is formed on the tapered surface 1c which is sharp. Reference numeral 2 denotes a water nozzle cylinder that is concentrically fitted onto the air nozzle cylinder 1 via a water chamber 2a, and a tapered throttle cylinder 3 that forms a mixed water channel 3a between the tip end side and the tapered surface 1c. A mixing tube 4 forming a mixing chamber 4a is connected to the tip end side axial center position. A water supply port 2b for supplying water into the water chamber 2a is formed on the side surface of the water nozzle cylinder 2, and a ring-shaped throttle portion 2c for closing the water chamber 2a is provided between the water chamber 2a and the mixed water flow passage 3a. The diaphragm holes 2d are formed at two symmetrical positions. Further, a plurality of injection holes 5 whose tip ends are spread outward are formed in the tip end plate 3b of the mixing cylinder 3 at regular intervals in the circumferential direction.

[0004]

[Problems to be solved by the device]

 However, in the air / water injection nozzle having the above-described configuration, since the distance from the air from the air injection port 1b and the water from the mixing water passage 3a to the injection hole 5 is long, the inside of the mixing chamber 4a There was a tendency that the air-water mixed fluid that had been mixed and stirred in (1) was separated again, and the atomization became insufficient and the particle size sprayed from the injection port 5 became large. In addition, the particle size varied depending on the jetting direction.

An object of the present invention is to solve the above-mentioned problems and to provide a two-fluid injection nozzle that can make the particle diameter sufficiently small and can perform uniform injection.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the two-fluid injection nozzle of the present invention is configured to inject the atomizing medium into the mixing chamber along the tip side axial direction from the atomizing medium nozzle of the atomizing medium nozzle cylinder. In the two-fluid injection nozzle, the atomized liquid is supplied from the outer peripheral portion through the throttle hole, and atomized liquid atomized by being stirred in the mixing chamber is sprayed together with the atomizing medium from the injection port at the tip of the mixing chamber. Four or more throttle holes are formed at regular intervals in the circumferential direction, and a mixing plate having a plurality of mixing through holes is provided near the injection port on the tip side of the mixing chamber.

[0007]

[Action]

 According to the above configuration, the atomized liquid is evenly dispersed and supplied into the spray medium through the four or more squeezing holes evenly arranged in the circumferential direction, so that uniform agitation is realized in the agitation chamber as a whole. In addition, uniform particles can be sprayed, and the mixing flow is promoted by the mixing through holes in the mixing plate before spraying from the spray port, so particles with a small particle size are sprayed even if the moving distance in the mixing chamber is long. can do.

[0008]

【Example】

 An embodiment of the air / water injection nozzle according to the present invention will be described below with reference to FIGS. The same members as those of the related art are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 2, the throttle portion 2c is formed with eight throttle holes 11, for example, at regular intervals in the circumferential direction, and the water supplied from the water chamber 2a into the mixing chamber 4a is rotated as much as possible. It is desirable to be configured so that it can be evenly dispersed in the direction, and it is desirable to form an even number of four or more at regular intervals in the circumferential direction.

A mixing plate 12 is installed on the front side of the mixing chamber 4a and on the front side of the end plate 4b. The mixing plate 12 has a transparent mixing plate 12 as shown in FIG. A plurality of holes (12a in the drawing) are formed as the hole 12a, or the inclined mixing through hole 12b that spreads out as shown in FIG. 3, or the inclined through hole 12c that becomes the outside as shown in FIG. The mixed fluid of air and water being sent to the tip side in the mixing chamber 4a is mixed again to atomize the diameter of water particles ejected from the ejection port 5.

According to the above embodiment, for example, when the flow rate of water is 500 liters / h and the flow rate of air is 100 Nm ³ / h, the average particle size of the spray obtained by the conventional air / water injection nozzle shown in FIG. In contrast to 80 to 90 μm, in the air / water injection nozzle according to the present embodiment, the average particle size of spray can be 70 to 80 μm, and the exhaust gas can be effectively cooled. Regarding the spraying state, in the conventional air / water injection nozzle, coarse particles were seen at two points in the symmetrical direction, but there was no scattering of coarse particles over the entire circumferential direction, and a uniform and stable spraying state was obtained. Was confirmed.

[0012]

[Effect of the device]

 As described above, according to the two-fluid injection nozzle of the present invention, the atomized liquid is uniformly dispersed and supplied into the atomizing medium through the four or more throttling holes which are evenly arranged in the circumferential direction. In addition to achieving uniform agitation in the whole area, uniform particles can be jetted, and the mixing flow is promoted by the mixing through hole of the mixing plate before being jetted from the jet port. Even if it is long, it can be sprayed with a small particle size.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an air / water injection valve according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA shown in FIG.

FIG. 3 is an enlarged cross-sectional view of a mixing plate.

FIG. 4 is an enlarged sectional view showing another embodiment of the mixing plate.

FIG. 5 is an enlarged sectional view showing another embodiment of the mixing plate.

FIG. 6 is a vertical cross-sectional view showing a conventional air / water injection valve.

7 is a cross-sectional view taken along line BB shown in FIG.

[Explanation of symbols]

 1 Air nozzle cylinder 1a Air chamber 1b Air injection port 1c Tapered surface 2 Water nozzle cylinder 2a Water chamber 2c Throttling part 3 Throttling cylinder 3a Mixing water channel 4 Mixing cylinder 4a Mixing chamber 4b End plate 5 Injection port 11 Throttling hole 12 Mixing plate 12a, 12b, 12c Mixing hole C axis

Front page continued (72) Hideo Shimotani, 5-3 28 Nishikujo, Konohana-ku, Osaka-shi, Osaka Prefecture (72) Hitachi Shipbuilding Co., Ltd. (72) Nobuyuki Yoshida 3-28, Nishikujo, Konohana-ku, Osaka, Osaka No. Hitachi Shipbuilding Co., Ltd. (72) Kenji Kashiwara Kenji Kashihara 5-3 28 Nishikujo, Konohana-ku, Osaka-shi, Osaka Inside Shipbuilding Co., Ltd. (72) Tadao Murakawa 5-3 Nishijojo, Konohana-ku, Osaka, Osaka No. 28 Inside Hitachi Zosen Corporation (72) Inventor Hideto Hideto Inside Hitachi Shipbuilding Co., Ltd. 3-28 Nishikujo 5-chome, Konohana-ku, Osaka City, Osaka Prefecture

Claims (1)

[Scope of utility model registration request] 1. A spray medium is sprayed into a mixing chamber from a spray medium injection port of a spray medium nozzle cylinder along the axial direction of a tip side, and atomized liquid is introduced into the spray medium from an outer peripheral portion through a throttle hole. In the two-fluid injection nozzle that supplies and atomizes the atomized liquid that is agitated in the mixing chamber and atomized together with the atomizing medium from the injection port at the tip of the mixing chamber, four or more throttle holes are formed at regular intervals in the circumferential direction. A two-fluid injection nozzle characterized in that a mixing plate having a plurality of mixing through holes is provided near the injection port on the tip side of the mixing chamber.