JP4554782B2 - Two-fluid nozzle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a two-fluid nozzle for spraying a combination of gas and liquid used for cooling of combustion exhaust gas generated in a waste treatment facility or high-temperature gas discharged from a boiler, combustion burner and the like.
[0002]
[Prior art]
As shown in FIG. 4, the waste gas treatment system for waste melting treatment combusts the combustion exhaust gas generated in the waste melting furnace in the combustion chamber, recovers heat in the boiler, and uses the temperature controller to discharge the exhaust gas from the boiler. It is cooled, separated into solid and gas by a dust collector, and discharged from a chimney by an induction fan. The combustion exhaust gas generated in the waste melting furnace is usually maintained at a temperature of 350 to 500 ° C. in order to stabilize the operation of the exhaust gas treatment system, and if this temperature is exceeded, it is a cooling spray nozzle installed in the duct. Cooling is performed within the above temperature range. In the temperature controller, the exhaust gas of about 350 ° C. discharged from the boiler by spraying the cooling water is cooled to a temperature of 160 ° C. or less so as not to affect the bag filter.
[0003]
For example, as a nozzle for cooling a high-temperature gas generated in an incinerator, Japanese Patent Laid-Open No. 7-124502 discloses that a liquid is supplied to the outer periphery of a gas supplied along an axial center line on the base end side of the nozzle body, In a two-fluid nozzle that mixes in the main body and sprays air-water mixing mist from the discharge port, the first mixing is performed by supplying liquid to the outer periphery of the gas supplied along the axial center line on the proximal end side of the nozzle body A rectifying chamber that communicates with the first mixing chamber to flow the mixed fluid to the tip side along the axial center line, and a second mixing chamber having a large diameter is provided on the tip side of the rectifying chamber. (2) An injection chamber having a small diameter is provided on the front end side of the mixing chamber, and the wall surface where the fluid of the outer peripheral portion of the mixed fluid collides with the passage between the front end side of the second mixing chamber and the front end side of the injection chamber in multiple stages While forming through the injection chamber, centered on the axis Two-fluid nozzle for spraying from the outlet is described.
[0004]
[Problems to be solved by the invention]
In the waste melting furnace, when a two-fluid nozzle is used for cooling the combustion exhaust gas, if the air is used, the combustion exhaust gas burns, and therefore, a two-fluid mist combining water vapor and water is sprayed. By miniaturizing the mist, it leads to the efficiency of gas cooling and the improvement of the performance of the combustion apparatus. However, when the steam and water are mixed, there is a problem that the steam is drained and the grains cannot be reduced.
[0005]
Further, in the two-fluid nozzle described in the above publication, since the second mixing chamber having a large diameter is provided on the front end side of the rectifying chamber, the path is long, and the liquid is supplied to the outer periphery of the gas supplied along the axis. For this reason, the liquid is biased toward the peripheral wall, and fine particles may not be sufficiently formed and may be drained.
[0006]
In addition, the passage between the front end side of the second mixing chamber and the front end side of the ejection chamber is formed in multiple stages with a wall surface on which the fluid of the outer peripheral portion of the mixed fluid collides, and has a large diameter on the front end side of the rectifying chamber. Since the two mixing chambers are provided, there are disadvantages that the nozzle length and diameter are increased and the processing is complicated.
[0007]
Therefore, the present invention provides a two-fluid nozzle having a simplified structure capable of obtaining a mist of fine particles.
[0008]
[Means for Solving the Problems]
A two-fluid nozzle according to the present invention includes a fluid passage member having a gas passage connected to a gas supply pipe and a liquid passage connected to the liquid supply pipe, and a dispersion chamber having a dispersion chamber connected to the fluid passage member. The fluid passage member is isolated from the liquid passage, and a plurality of gas passages are disposed around the liquid passage at circumferential intervals, and the dispersion chamber is a cylindrical body made of a vertical wall. And a nozzle tip having an injection port is provided, and the nozzle tip is formed of a conical wall projecting into the dispersion chamber, and is formed in the dispersion chamber. The wall and the conical wall form a return of a concave portion that forms a reversal flow around the conical wall, and the injection port side of the nozzle tip is formed into a spherical surface .
[0009]
Injection port may be a plurality of slits formed radially from the center hole.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In the two-fluid nozzle of the present invention, the combination of gas and liquid can be appropriately selected depending on the place of application. For example, in waste melting treatment, air that burns combustion exhaust gas as a gas cannot be used to cool the combustion exhaust gas in a waste melting furnace, so steam is used, and air is used because there is no risk of combustion in the temperature controller. To do. In addition, it can employ | adopt as what uses mist like a combustion burner.
[0011]
【Example】
Example 1
1A is a cross-sectional view of an embodiment of the two-fluid nozzle of the present invention, and FIG. 1B is a cross-sectional view taken along the line AA in FIG. The cylindrical nozzle body 1 includes a fluid passage member 2 that supplies gas and liquid to the dispersion chamber 4 and a dispersion chamber member 3 that is connected to the fluid passage member 2.
[0012]
The fluid passage member 2 is provided with a liquid passage 5 in the center along the axial center of the cylindrical nozzle body 1, and is isolated from the liquid passage 5, and surrounds the liquid passage 5 and has a circumferential interval. A plurality of gas passages 6 are formed.
[0013]
Below the liquid passage 5, a liquid supply pipe 7 for supplying a liquid, for example, water is connected. In addition, a communicating portion 8 is formed below each of the plurality of gas passages 6, and a gas supply pipe 9 is connected to the communicating portion.
[0014]
The dispersion chamber member is formed as a cylindrical dispersion chamber composed of vertical walls. The lower portion of the dispersion chamber communicates with the opening of the liquid passage and the openings of a plurality of circumferentially arranged gas passages. It is blocked by a sealed wall.
[0015]
A nozzle tip 10 communicating with the dispersion chamber 4 is fixed to the upper part of the fluid passage member 2 with bolts. In the present embodiment, the injection port 11 of the nozzle tip 10 is opened in a direction perpendicular to the axis of the nozzle body 1. The ejection port 11 is formed with a plurality of slits formed radially from the center. In this embodiment, the ejection port 11 of the nozzle chip 10 is formed with a cross-shaped slit.
[0016]
The nozzle tip 10 has a conical wall 12 protruding into the dispersion chamber 4, and a concave return 14 is formed by the wall 13 and the conical wall 12 of the dispersion chamber 4. By forming the return 14, the reverse flow 15 can be formed, and the dispersed gas and liquid can be mixed and further refined. Further, by making the nozzle tip 10 on the side of the ejection port 11 to be a spherical surface 16, the energy distribution of the fluid ejected from the ejection port 11 can be made uniform.
[0017]
Example 2
FIG. 2 is a plan view of another embodiment of the two-fluid nozzle of the present invention, FIG. 3 is a cross-sectional view thereof, the same members as those in FIG. In this embodiment, the injection port 11 is opened in the same direction as the axial center line of the nozzle body 1. The opening direction of the injection port 11 can be appropriately selected depending on the installation location of the two-fluid nozzle.
[0018]
【The invention's effect】
According to the two-fluid nozzle of the present invention, since gas is supplied from the periphery of the liquid, the particles are dispersed efficiently and fine particles are formed. For example, even in the case of a combination of steam and water, steam drainage may be generated. Absent.
[0019]
Further, the two-fluid nozzle of the present invention is a cylindrical body with a vertical wall in the dispersion chamber, and it is not necessary to provide a step, so that it is not necessary to increase the diameter, and processing is easy.
[Brief description of the drawings]
1A is a cross-sectional view of an embodiment of a two-fluid nozzle of the present invention, and FIG. 1B is a cross-sectional view taken along line AA of FIG.
FIG. 2 is a plan view of another embodiment of the two-fluid nozzle of the present invention.
FIG. 3 is a cross-sectional view of another embodiment of the two-fluid nozzle of the present invention.
FIG. 4 is a flow chart of an exhaust gas treatment system for waste melting treatment.
[Explanation of symbols]
1: nozzle body, 2: fluid passage member, 3: dispersion chamber member, 4: dispersion chamber, 5: liquid passage, 6: gas passage, 7: liquid supply pipe, 8: communication section, 9: gas supply pipe, 10 : Nozzle tip, 11: injection port, 12: conical wall, 13: wall of dispersion chamber, 14: concave return, 15: reversal flow, 16: spherical surface

Claims (2)

A fluid passage member having a gas passage connected to the gas supply pipe and a liquid passage connected to the liquid supply pipe, and a dispersion chamber member having a dispersion chamber connected to the fluid passage member;
The fluid passage member is isolated from the liquid passage and has a plurality of gas passages that are circumferentially spaced around the liquid passage.
The dispersion chamber is formed of a cylindrical body made of a vertical wall, communicated with the opening of the liquid passage and the opening of the gas passage, and provided with a nozzle tip having an injection port ,
The nozzle tip is formed of a conical wall projecting into the dispersion chamber, and the dispersion chamber wall and the conical wall form a return of a recess that forms a reversal flow around the conical wall, and the injection of the nozzle tip A two-fluid nozzle characterized in that the mouth side is formed into a spherical surface . 2. The two-fluid nozzle according to claim 1, wherein the injection port comprises a plurality of slits formed radially from the center hole.

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