JPS6150208B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for supplying incineration material to a swirling fluidized bed furnace, and is particularly suitable for supplying ash dust collected from exhaust gas (hereinafter referred to as EP ash) to a swirling fluidized bed furnace. The present invention relates to an incineration material supply device.

Large amounts of EP ash, which contains carbon, is collected from boilers such as large thermal power plants that burn large amounts of heavy oil and crude oil, and its disposal has become a problem. Several treatment methods have been proposed, but recently it has become possible to reduce the volume and weight of EP ash, as well as make effective use of the stored energy, and it is also possible to recover metals such as vanadium in EP ash. Incineration treatment is attracting attention for several reasons. Figure 1 shows the structure of a swirling fluidized bed furnace that incinerates this EP ash. A swirling fluidized bed furnace is a fluidized bed furnace in which the perforated plate at the bottom of the furnace has an inverted conical shape, and the fluidizing air flows through the air holes in the perforated plate along the inner wall of the perforated plate, creating a swirling flow in the fluidized medium. say. A fluidized medium 7 such as sand is contained in the swirling fluidized bed furnace 1, and a swirling flow is given to this fluidized medium 7 by combustion air ejected from small holes 4 opened in the tangential direction of the perforated plate 2. At the same time, a jet flow is also provided by the upward flow of combustion air ejected from the riser pipe 5, resulting in a complex flow as a whole. EP ash is ejected from the EP ash supply nozzle 3 by pneumatic transport to the fluidized medium 7 in this state and is burned. However, since the conventional EP ash supply nozzle 3 opens at the inner circumferential surface of the furnace material 6 as shown in the figure, the supplied EP ash cannot penetrate deep into the fluidized medium. Further, in the upper part of the fluidized bed, the swirling flow and the jet flow are attenuated, and the movement of the fluidized medium is relatively slow. For this reason, the supplied EP ash did not spread uniformly throughout the fluidized bed and tended to stagnate in some parts. Furthermore, in order to introduce EP ash deeper into the layer, the area load per supply nozzle was increased to 2.6 ^m2 , but this resulted in the EP ash being concentrated in one part. For this reason, there was a drawback that clinker was formed on the nozzle part and the inner wall surface of the furnace material due to the melting of EP ash, which obstructed the flow of the fluidizing medium.

The applicant of the present application previously proposed in Japanese Patent Application No. 52-46758 (Japanese Patent Publication No. 58-43652) that the structure of the nozzle for supplying the powdered material is made such that its axis is tangential to the swirling flow of the medium. . However, under these conditions alone, it could not be said that the powdered material would be able to ride the flow of the medium sufficiently. That is, it has been found that the opening position of the tip of the supply nozzle in the furnace is important for proper combustion. As a condition for this, it is necessary to carry the ejected powdered material in a downward flow from the furnace wall along the slope of the conical perforated plate.

The purpose of this invention is to eliminate the above-mentioned drawbacks of the prior art, suppress the generation of clinker, and
An object of the present invention is to provide an incineration material supply device that can increase the combustion efficiency of incineration materials such as EP ash.

In short, this invention protrudes the spout of the EP ash supply nozzle using air flow transportation into the fluidized bed, preferably makes the spout nozzle flush with the upper end surface of the perforated plate, and sets the installation angle of the supply nozzle at about 15° to 45°. It is characterized by ゜.

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

One or more EP ash supply nozzles 3 are provided for the fluidized bed furnace 1. The EP ash supply nozzle 3 is provided with an installation angle α in the range of about 15° to 45°, with the spout facing downward and protruding into the fluidized bed. The tip of the opening is cut out on the same plane as the upper end surface 9 of the conical porous plate 2, and the opening is formed to be substantially horizontal. Further, the installation height h at the outer periphery of the fluidized bed furnace is set to about 250 to 300 mm.

In the above device, pneumatically transported EP ash8
is from the EP ash supply nozzle opening protruding into the bed.
It ejects toward the perforated plate where the fluidity is most active. The ejected EP ash is evenly spread and burned by the active movement of the fluidized medium. Also, since the EP ash is ejected into the bed, the area load of the supply nozzle (cross-sectional area of the fluidized bed/number of nozzles) may be as low as 1.5 m ² /nozzle or less, and the EP ash is not supplied into the furnace. The speed should be about 20m/s to 30m/s.

According to this invention, the incinerated matter such as EP ash is uniformly diffused in the fluidized bed and no clinker is formed, so that the fluidized medium moves smoothly and the combustion efficiency can be increased.

In addition, since the incinerated material can be mixed deep into the fluidized bed, the residence time of the incinerated material can be extended and complete combustion can be achieved.

[Brief explanation of the drawing]

Figure 1 is a partial side cross-sectional view of a swirling spouted bed furnace showing the conventional EP ash supply method to the swirling spouted bed furnace;
The figure is a partial cross-sectional side view of a swirling spouted bed furnace equipped with a feeding device according to the present invention. 1... Swirling fluidized bed furnace, 2... Perforated plate, 3... EP ash supply nozzle, 4... Small hole, 5... Riser pipe, 6... Furnace material, 7
...Fluid medium, 8...EP ash, 9... Upper end surface of perforated plate, α
...Mounting angle.

Claims (1)

[Scope of Claims] 1. In a device in which the incineration material that is transported by air current and melts as the temperature rises is incinerated in a swirling fluidized bed, the installation angle α of the incineration material supply nozzle that supplies the incineration material is approximately 15° to 45°. What is claimed is: 1. A device for supplying materials to be incinerated, characterized in that the incineration material supplying nozzle is notched so that its tip opening is located on the same plane as the upper end surface of the perforated plate. 2. The incineration material supplying device according to claim 1, characterized in that the ejection speed of the incineration material ejected from the incineration material supply nozzle is 20 m/s to 30 m/s. 3. The incineration material supplying device according to claim 1, characterized in that the area load of the incineration material supply nozzle is 1.5 m ² /nozzle or more.