JPS5838214B2 - Liquid spray nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nozzle for spraying a liquid material, and particularly to a nozzle suitable for spraying a liquid material into a fluidized bed.

The fluidized bed, which contains powder and granules and is formed by fluidizing the powder and granules by fluidizing gas supplied from the bottom through a disperser, is used for the decomposition of petroleum, the gasification and combustion of coal, and the production of ore. It is used in various processes such as roasting and waste incineration.

In these fluidized beds, fuel oil is often sprayed into the fluidized bed to raise the temperature at the start of operation or to maintain the temperature of the fluidized bed.

Further, when the processed material is liquid, such as when a fluidized bed is used to decompose petroleum, the liquid processed material itself is sprayed and supplied to the fluidized bed.

Figure 1 shows an example of a mode in which fuel oil or liquid treated material (hereinafter referred to as liquid material) is sprayed and supplied to a fluidized bed.
The fluidized bed device 1 has a built-in granular material 2, and fluidizes the granular material 2 using a fluidizing gas 4 supplied from the bottom via a gas distribution plate 3 to form a fluidized bed 5.

A liquid spray nozzle 6 is provided on the wall of the fluidized bed section,
A liquid 7 and a spraying fluid 8 are supplied.

In the spray nozzle 6 , the liquid material 7 is atomized by a spray fluid 8 and sprayed onto the fluidized bed 5 .

Air or water vapor is generally used as the spraying fluid 8.

Depending on the application process, the sprayed liquid is burned in the fluidized bed 5, or it is treated by causing a reaction such as decomposition.

Conventionally, a spray nozzle with a double pipe structure as shown in FIG. 2 has been used as a spray nozzle for supplying a liquid to the fluidized bed as described above.

That is, the inside of the inner tube is a flow path 11 for the liquid material 7 supplied from the liquid material 21, and the gap formed between the outer tube and the inner tube is the flow path 12 for the atomizing fluid 8 supplied from the atomizing fluid material 22. It becomes.

The liquid flow channel 11 is constricted at the tip on the liquid material spouting side, and the tip becomes a liquid material spouting hole 13, the position of which corresponds to a spray port 14 to be described later.

The spraying fluid flow path 12 is also located at the tip on the jetting side, and the liquid material jetting hole 1
3 to form a spray nozzle 14.

In this way, the liquid flow path 11 and the spraying fluid flow path 12 meet at the spray nozzle 14, and the liquid 7 supplied from the liquid material flow path 21 passes through the liquid flow path 11 and reaches the nozzle hole 13, and then the spray nozzle. At step 14, the liquid is atomized by the atomizing fluid 8 and ejected.

However, as a result of using such a spray nozzle in a fluidized bed device, the powder and granules forming the fluidized bed enter the spray nozzle from the spray port 14 and the liquid material spout hole 13 and the spray port 14 enter the spray nozzle.
This caused the problem of occlusion.

In particular, when filling powder or granular material into the fluidized bed device before startup operation, or when temporarily interrupting the supply of liquid material, only the spraying fluid is supplied to the spray nozzle and is ejected into the fluidized bed. These times often resulted in the above-mentioned blockage problem.

This is due to pressure fluctuations in the spray nozzle installation area that occur as the powder and granules in the fluidized bed are violently fluidized by the fluidizing gas.

Although the atomizing fluid or the atomizing fluid and the liquid material are being ejected from the atomizing port, the pressure at the nozzle installation part increases momentarily, causing some of the powder and granules in the fluidized bed to infiltrate into the ejecting port. It is considered that

Blockage of the spray port obstructs the supply of liquid to the fluidized bed, leading to serious problems such as making it impossible to start up or continue operation of the fluidized bed apparatus.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional spray nozzle, to prevent blockages that occur when no liquid is supplied, and to provide a liquid spray nozzle that can be restored in a short time even if blockages occur during the supply of liquids. We provide spray nozzles for you.

In order to achieve the above object, the present invention provides a liquid supply inlet and a liquid flow path having a jet hole for the liquid supplied from the supply inlet at the end thereof, and a liquid flow path provided outside the liquid flow path. and having a spray fluid supply inlet and a spray port at an end thereof that atomizes the liquid by the spray fluid supplied from the spray fluid supply inlet in an area adjacent to the ejection hole of the liquid. In a liquid material spraying nozzle provided with a flow path for a liquid, the jetting hole for the liquid and the spraying port for atomizing the liquid with the spraying fluid are concentric and have the same diameter, and further, a A rod-shaped member is provided concentrically with the jet hole, and the diameter of the tip of the liquid material spouting hole side is slightly smaller than the diameter of the jetting hole, and the tip of the rod-shaped member is connected to the liquid material supply inlet side by external means. The liquid material is moved through the ejection hole and the spray nozzle.

An embodiment of the present invention will be described below with reference to FIG.

As shown in the figure, the liquid spray nozzle 6 has a nearly double-tube structure, and the inside of the inner tube is formed by a flow path 11 for the liquid 7 supplied from the liquid supply inlet 21, an outer tube, and a ceramic tube. The gap formed therein serves as a flow path 12 for the atomizing fluid 8 supplied from the atomizing fluid port 22 .

The liquid flow channel 11 is constricted at the end on the liquid material spouting side to form a liquid material spouting hole 13, whose position is a spray port 1 to be described later.
It corresponds to 4 and is concentric and has the same diameter.

The atomizing fluid flow path 12 is also constricted at the end on the ejection side adjacent to the liquid material ejection hole 13 to form a spray port 14 .

In this way, the liquid flow path 11 and the spray fluid flow path 12 merge at the spray port 14.

On the other hand, the liquid flow channel 11 has a tip 4 on the side of the liquid nozzle.
A rod-shaped member 40 whose diameter is slightly smaller than the diameters of the ejection holes 13 and the ejection ports 14 is provided.

The rod-shaped member 40 has a seal stage 42 on the liquid supply side.
The extension part is sealed and extended from the liquid flow path 11 to the outside, and the extension part is provided with a moving mechanism 43 for the rod-shaped member 40 and a moving operation handle 44 .

The sealing means 42 may be a normal gland seal type, and the moving mechanism 43 may be a normal metric thread or trapezoidal thread.

Further, the length of the tip end 41 of the rod-shaped member 40 is set to a length necessary to pass through the ejection hole 13 and the spray nozzle 14, and the tip end thereof is sharpened into a conical shape.

Note that the outer tube of the spray nozzle is provided with a flange 45 for attachment to a fluidized bed apparatus.

Therefore, by installing the liquid material spray nozzle of the present invention in a fluidized bed apparatus as shown in FIG. When only the spraying fluid 8 is supplied, such as when the spraying fluid 8 is interrupted, the moving operation handle 44 is moved to move the rod-shaped member 40 to the liquid material spouting side, and the tip end 41 of the rod-shaped member 40 is connected to the liquid material spouting hole 13 and By penetrating the spray nozzle 14, it is possible to prevent part of the powder from entering the spray nozzle.

In addition, if the spray port 14 or the jet hole 13 is clogged due to the infiltration of powder while supplying the liquid, move the moving operation handle 44 in the same way to move the rod-shaped member 40 to the liquid jet side. The tip 41 of the rod-shaped member 40 is passed through the blocked spray port 14 or the spray hole 13, thereby pushing the powder back into the fluidized bed and removing the blockage.

Once the blockage is removed, the spray supply of the liquid can be resumed by pulling the bar member 40 back to the position shown in FIG.

As described above, according to the embodiments of the present invention, it is possible to prevent the spray nozzle from clogging when no liquid is supplied.
Even if the spray nozzle becomes clogged during supply of the liquid, the blockage can be cleared in a short time, so it will not become impossible to start up or continue operation of the fluidized bed apparatus.

Specific examples of the present invention will be described below.

In a fluidized bed device that produces light oil by decomposing vacuum residue oil by contacting it with granules at a reaction temperature of 500 to 560'C, a book with specifications as shown in Table 1 is used as a spray nozzle for vacuum residue oil to the fluidized bed. A liquid spray nozzle of the invention was used.

The vacuum residue oil is from Kuwait and has a specific gravity of 1.02 (15
/4℃), viscosity 3500 Cst (98.8℃)
It was supplied at a supply rate of 28 kg/hr.

On the other hand, using water vapor as the spraying fluid 2. 5 kg
/hr was supplied.

The powder in the fluidized bed has an average particle size of 210μ and an apparent density of 3.
It is of 4g/7.

Despite the above conditions, the spray nozzle occasionally became clogged, but
By the operation according to the present invention described above, the operation of the fluidized bed apparatus could be continued for a long time without completely stopping the operation.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a mode of spraying and supplying a liquid to a fluidized bed, Fig. 2 is a structural diagram of a conventional liquid spray nozzle, and Fig. 3 is a diagram showing an embodiment of the present invention. FIG. 3 is a structural diagram of a spray nozzle. 2...Fluidized bed, 6...Spray nozzle, 7
...Liquid treated product, 8...Fluid for spraying,
11... Liquid channel, 12... Fluid channel for spraying, 13... Spout hole, 40...
Rod-shaped member, 43...Movement mechanism.

Claims (1)

[Claims] 1. A liquid flow channel having a liquid supply inlet and an ejection hole for the liquid supplied from the supply inlet at its end, and a supply inlet for spraying fluid provided outside the liquid flow channel and its end. A spray nozzle for a liquid material is provided with a spray fluid passage having a spray port for atomizing the liquid material by a spray fluid supplied from the spray fluid supply inlet in an area adjacent to the spout hole. The ejection hole of the object and the spray nozzle are concentric and have the same diameter, and further, a rod-shaped member whose tip end diameter on the side of the ejection hole of the liquid material is slightly smaller than the diameter of the ejection hole is placed in the liquid flow path concentrically with the ejection hole. 1. A spray nozzle for a liquid material, characterized in that the tip of the rod-like member is moved through the spout hole and the spray opening of the liquid material by means from outside the liquid material supply inlet side.