JPS644117B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a furnace wall cooling device, and more particularly to a furnace wall cooling device that prevents clinker from adhering to the furnace wall and is suitable for a swirling spouted bed furnace.

A swirling spouted bed furnace incinerates incinerated materials by applying swirling flow and jet energy to a fluidized medium.
The incineration efficiency is very good due to the active movement of the fluidized medium. However, during this incineration process, the temperature in the empty column of the incinerator reaches a very high temperature of 700℃ to 850℃, which causes the low melting point substances contained in the ash of the incinerated material to melt and solidify on the furnace walls. Form clinker. For this reason, methods have been provided to cool the furnace walls and prevent clinker formation. FIG. 1 shows an example of conventional furnace wall cooling, in which multiple stages of headers 5 with orifice holes 6 are arranged on the inner peripheral wall of the cavity section of a fluidized bed furnace 1.
The cooling air was blown down along the inner peripheral wall to cool the furnace wall 2. However, this method causes oxidation and deterioration of the metal constituting the air header due to the high temperature gas in the furnace. Also, this header 5
In this case, a large temperature difference occurs between the front surface that is in direct contact with the high-temperature gas and the back surface that is in close contact with the furnace wall 2, and a large thermal stress is applied to the annular header 5. For this reason, the header 5 may be deformed or
Accidents such as cracking occurred, making uniform cooling inside the furnace difficult, and a cooling method as shown in Fig. 2 was proposed. In this method, the air header 5a is placed on the outer periphery of the furnace to avoid being affected by the heat inside the furnace, and the air header 5a is provided with an air passage slit 9 on the furnace wall 2.
A rectifying plate 8 was placed at the outlet of the slit 9 on the inside of the furnace. However, in this method, the header 5a
Although the influence of heat can be avoided, there is a risk that the current plate 8 may be deformed due to thermal stress and cracks may occur. For this reason, a method has been proposed in which the baffle plate 8 formed in the circumferential direction of the hollow column inside the furnace is divided into a plurality of pieces.
There was a risk that these divided rectifier plates themselves would be deformed, so this was not a fundamental solution.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a structure of a furnace wall cooling device that can cool the furnace wall well and is not affected by the heat inside the furnace.

In short, this invention provides a furnace wall cooling device in which the other end of an air pipe connected to an air header placed on the outer wall of an incinerator cavity is opened downward into the furnace, and these air pipes are arranged in one or more stages in the circumferential direction of the cavity. It is.

Examples of the present invention will be described below.

In FIG. 3, a plurality of stages (three stages in the illustrated case) of air headers 5a are arranged on the outer wall of the empty tower portion of the incinerator 1 so as to surround it. Reference numeral 17 denotes an air pipe, one end of which opens toward the air header 5a, and the other end of which passes through the furnace wall 2 and opens into the hollow column within the furnace. The part of the air pipe 17 protruding into the cavity is bent downward along the inner surface of the furnace wall 2, and its opening is a flattened slit-shaped part as shown in A and B in FIG. air nozzle 1
7a. As shown in FIG. 5, these air pipes 17 are arranged in large numbers along the circumferential direction of the furnace wall so that cooling air flows over the entire surface of the furnace wall. Further, in order to further improve the distribution of air to the furnace wall, the air pipes 17 arranged in the headers of each stage are preferably arranged in a staggered manner when viewed from above.

In the cooling device constructed as described above, the cooling air that has reached the air header 5a from the air pipe 3 is jetted downward from the nozzle 17a of the air pipe 17 along the inner surface of the furnace wall 2. As a result, the furnace wall 2 is cooled, and a cooling air layer is formed on the inner surface of the furnace wall.

According to this invention, the cooling device is not affected by the heat inside the furnace, and problems such as deformation and cracking due to heat do not occur, and the cooling efficiency of the furnace wall is also good.

[Brief explanation of drawings]

FIG. 1 is a side sectional partial view of a furnace wall provided with a conventional furnace wall cooling device, FIG. 2 is a side sectional partial view of a furnace wall provided with another conventional cooling device, and FIG. 3 is a partial side sectional view of a furnace wall provided with a conventional furnace wall cooling device. Partial side cross-sectional view of a furnace wall equipped with a furnace wall cooling device, No. 4
Figure A is a partial plan view of the air pipe, Figure B is a front view, and Figure 5
The figure is a plan view of the apparatus shown in FIG. 3. 1... Incinerator, 2... Furnace wall, 5, 5a... Air header, 17... Air pipe, 17a... Air nozzle.

Claims (1)

[Scope of Claims] 1. A furnace wall cooling device that cools the furnace wall by jetting air against the inner surface of the furnace wall in the empty column of a fluidized bed furnace,
An air header is arranged in one or more stages in the circumferential direction of the outer wall of the cavity section of a fluidized bed furnace. A furnace wall cooling device comprising a plurality of air pipes facing downward along the inner surface of the wall. 2. The furnace wall cooling device according to claim 1, wherein the opening on the furnace wall side of the air tube is an air nozzle formed in the shape of a slit.