JPH0346854Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a two-fluid spray nozzle used for atomizing liquid, and particularly to a spray nozzle suitable for a low _NOx heavy oil combustion burner.

(Prior Art) Conventionally, compressed air or water vapor is generally used as an atomization medium to improve the atomization of water or liquid fuel. In addition, various efforts have been made to use the two-fluid spray method, such as swirling the liquid and then applying the energy of the spray medium to create a finer atomization. However, if the amount of spray is large, many spray holes must be provided. In this case, there was a drawback that once sprayed particles collided with each other, causing re-aggregation, so that a uniform spray of particles could not be formed.

In addition, in the case of a multi-hole nozzle as described above, the spray becomes a full cone type in which spray particles are also present in the center of the spray, but this drawback is the main cause of increasing the amount of NO _x produced when used as a combustion burner for heavy oil etc. It was hot.

(Problems to be Solved by the Invention) The present invention improves the above-mentioned conventional drawbacks, creates a uniform and fine spray in a large-capacity nozzle, and produces a spray that can produce low NO _x when used as a combustion burner. The aim is to provide a nozzle.

(Means for Solving the Problems) As a means for solving the above-mentioned problems, the present invention provides the following improvements to a two-fluid spray nozzle consisting of a spray medium injection system and a liquid injection system.

The present invention will be explained below based on the drawings.

FIG. 1 is a sectional view taken through the axis of the spray nozzle of the present invention, showing one embodiment of the spray nozzle having a spray system for a spray medium on the outside and a liquid on the inside.

A nozzle tip 2 is integrally fixed to the main body 1 with a screw, and a distal tip 3 is fixed to the nozzle tip with a screw. The spray medium introduced into the body 1 is first led into the medium chamber 4 and is ejected from an annular slit 5 provided on the circumference of the inclined part of the body 1 adjacent to the nozzle tip 2. The width of the slit 5 can be adjusted by changing the thickness of the packing 6. Further, the spray medium in the medium chamber is also ejected from nozzles 7 provided at equal intervals on the circumference of the inclined portion of the main body 1. Furthermore, the medium reaches the slit 9 from the medium chamber 4 through the guide hole 8 passing through the nozzle tip 2 parallel to the axis of the spray nozzle, and is composed of the nozzle tip 2 and the tip 3, and is located between them. It also gushes from slit 9. Adjustment of the width of the slit 9 is achieved by changing the thickness of the shim 10.

The above is the configuration and function of the spray medium system.

Next, we will discuss the liquid system. The liquid first passes parallel to the axis of the spray nozzle and is led from the main body 1 to a liquid chamber 11 extending approximately 3 to 5 mm from the liquid nozzle 12 of the nozzle tip 2, and the spray medium is ejected from the liquid nozzle 12 to the outside. It is sucked in, mixed with the spray medium, and atomized. Annular slit 5
The angle formed with the spray direction of the nozzle 7 is related to the shape and situation of the spray, and is preferably around 50 degrees. The liquid sucked from the center by the nozzle 12 in a direction perpendicular to the axial direction of the spray nozzle becomes a mixed spray consisting of various particle sizes, and is further agglomerated by collision of the spray particles with each other, resulting in a large particle spray. occurs inside and outside. Liquid nozzle 12 and slit 9
The distance between the annular slit 5, the nozzle 7 and the slit 9 is 5 to 10 mm.
The large-particle spray is further re-sprayed, and at the same time it rectifies the spray to adjust the shape of the spray particles, thereby reducing collisions between particles and preventing reagglomeration.

(Example) The spray nozzle of the present invention was used in a heavy oil combustion boiler.

The combustion capacity of the burner was 700/hr, the air pressure was 3 Kg/cm ² , the number of slits was 0.5 mm each, the air holes were 2 mm φ, the heavy oil holes were 1.8 mm φ, and the number of holes was 15 each. The spray shape was holocone, and the spray particles were uniform and fine.

Comparing the results with a burner without internal and external slits, we found that in the burner using the nozzle of this invention, the fuel oil consumption rate was improved by approximately 3%, and the NO _x content was approximately 13%.
The dust was reduced by about 20%. The burner also became less dirty and the cleaning interval was doubled.

(Effects) Improved combustion efficiency of burners using the nozzle of this invention.
As mentioned above, the NO _x reduction effect is extremely significant.
It also has the effect of generating less dust and reducing burner dirt, which is a significant improvement compared to conventional nozzles.

[Brief explanation of the drawing]

FIG. 1 shows a cross-sectional view of the spray nozzle of the present invention. DESCRIPTION OF SYMBOLS 1... Main body, 2... Nozzle chip, 3... Tip tip, 4... Spray medium chamber, 5... Annular slit, 6... Packing, 7... Nozzle, 8... Guide hole, 9... Slit,
10...Shim, 11...Liquid chamber, 12...Liquid nozzle.

Claims (1)

[Claims for Utility Model Registration] A medium chamber 4 provided in the main body 1 into which a spray medium is introduced, an annular slit 5 whose width can be adjusted according to the thickness of a packing 6 directly connected to the medium chamber, and a nozzle 7. , a guide hole 8 that passes through a nozzle tip 2 that is integrally fixed to the main body 1 with a screw and communicates the medium chamber 4 and the slit 9, and a tip 3 that is integrally fixed to the nozzle tip 2 and the nozzle tip with a screw. A spray medium injection system consisting of a slit 9 that sprays a spray medium whose width is adjustable according to the thickness of the shim 10, and in which the spray direction of the annular slit 5 and the nozzle 7 is inclined with respect to the axial direction of the spray nozzle, and a main body. 1 and a liquid chamber 11 into which liquid is introduced, provided in the nozzle tip 2, and a liquid nozzle 12 directly connected to the liquid chamber.
The atomizing medium injection system and the liquid injection system are installed inside a main body 1 that integrally and fixedly accommodates them, and a nozzle tip 2 and a tip tip 2 fixed to the main body. A spray nozzle consisting of