JPH0972526A - Fluidized-bed type incinerating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluidized-bed type incinerating furnace capable of reducing blower power by decreasing the pressure loss of a dispersing plate or nozzle at the time of high temperature. SOLUTION: A bimetal type opening regulating plate 6 which makes it possible to switch a nozzle hole 5 in response to the fluidized air temperature is provided in the hole 5 of an air dispersing unit 1 provided at the hearth of the fluidized-bed type incinerating furnace. The opening of the hole 5 is increased at the time of low temperature to reduce the pressure loss.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an improvement of a fluidized bed type incinerator used for incineration of various wastes.

[0002]

2. Description of the Related Art As shown in FIG. 6, a fluidized bed type incinerator ejects fluidized air from an air dispersion section 1 provided in the hearth into a furnace chamber 2 to cause a fluidized medium 3 to flow and to be charged. It is an incinerator with a structure that burns the generated waste. A large number of dispersion nozzles 4 as shown in FIG. 1, for example, are installed in the air dispersion unit 1, and nozzle holes 5 provided in the upper side surface thereof.
A fluidized bed is formed by ejecting fluidized air from.

In such a fluidized bed type incinerator, the temperature of the fluidized air differs by several hundreds of degrees between the starting time and the steady state operation, and the volume of the fluidizing air greatly changes accordingly. As a result, in order to maintain the fluidized state, the amount (volume) of the flowing air passing through the nozzle hole 5 largely changes depending on the temperature of the flowing air. However, since the opening area of the nozzle hole 5 is constant, the pressure loss of the flowing air passing through the nozzle hole 5 is small at a high temperature, but the pressure loss becomes very large at a low temperature, and a large amount of blower power is required. .

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a fluidized bed incinerator capable of reducing the pressure loss of the air dispersion portion at low temperature and reducing the blower power. It was done for good.

[0005]

SUMMARY OF THE INVENTION The present invention, which has been made to solve the above problems, is a bimetal type which opens and closes a nozzle hole of an air dispersion portion provided in a hearth according to the temperature of flowing air. The opening degree adjusting plate is provided. The air dispersion unit may be a dispersion plate type as shown in FIG. 6 or a dispersion nozzle type. Further, the bimetal type opening adjustment plate reduces the opening area of the nozzle hole at a high temperature and increases the opening area of the nozzle hole at a low temperature.

[0006]

DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS.
A preferred embodiment of the present invention will be described. In FIG. 1, 4 is a dispersion nozzle provided in the air dispersion unit 1,
5 is the nozzle hole. The nozzle hole 5 is formed laterally to prevent the fluid medium from entering. A bimetal type opening adjustment plate 6 is provided inside the nozzle hole 5. In this, the base portion of the bimetal 7 that deforms as shown by the chain line when the flowing air temperature becomes low is fixed to the dispersion pipe 4, and the closing member 8 is attached to the tip of the bimetal 7. This bimetal type opening adjustment plate 6 has an opening of about 50 when the flowing air temperature is 350 to 400 ° C.
It is preferable to adjust it so as to be%. This structure has the advantages of a simple structure, good operability, easy maintenance, and the ability to fully close the nozzle hole 5, but there is also the risk of biting the fluid medium. .

FIG. 2 shows a type in which a bimetal type opening adjustment plate 6 is moved laterally with respect to the nozzle hole 5.
It is attached to the rear surface of the ceiling surface of the dispersion pipe 4. The bimetal 7 is deformed by radiant heat and conductive heat from the ceiling surface of the dispersion pipe 4, opens the nozzle hole 5 as shown by the solid line at low temperature, and closes the nozzle hole 5 as shown by the chain line at low temperature. This structure has advantages such as a simple structure, good operability, easy temperature setting of the bimetal 7, and difficulty in biting the fluid medium. It is not easy to occlude.

Similarly to FIG. 2, FIG. 3 also shows a type in which a bimetal type opening adjustment plate 6 is moved laterally with respect to the nozzle hole 5. However, in the structure of FIG. 2, the bimetal 7 is installed in parallel with the axis of the nozzle hole 5, while in FIG.
However, the difference is that the bimetal 7 is installed in a direction perpendicular to the axis of the nozzle hole 5. With this structure, the structure is simple and the temperature of the bimetal 7 can be easily set.

In the structure shown in FIGS. 4 and 5, two bimetals 7, 7 are provided so as to sandwich the nozzle hole 5 from both sides.
The nozzle hole 5 is provided on the back surface of the nozzle so that the nozzle hole 5 is opened as shown in FIG. This structure has the advantages of good operability and less entrapment of the fluid medium.

[0010]

In any of the above-mentioned structures, the bimetal type opening adjusting plate 6 automatically opens and closes the nozzle hole 5 according to the temperature of the flowing air, and the opening degree of the nozzle hole 5 is low at a low flow rate. And the opening degree of the nozzle hole 5 can be increased at low temperature where the flow rate increases. Therefore, there is an advantage that the pressure loss of the flowing air passing through the nozzle hole 5 at a low temperature can be reduced and the blower power can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part for explaining a first embodiment of the present invention.

FIG. 2 is a sectional view of an essential part for explaining a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of an essential part for explaining a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of an essential part for explaining a fourth embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a cross-sectional view of an entire conventional fluidized bed incinerator and a main portion thereof.

[Explanation of Codes] 1 air dispersion part, 2 furnace chamber, 3 fluid medium, 4 dispersion nozzle, 5 nozzle holes, 6 bimetal type opening adjustment plate,
7 Bimetal, 8 Closing member

Claims (1)

[Claims] 1. A fluidized bed type incinerator characterized in that a bimetal type opening adjustment plate for opening and closing the nozzle hole according to the temperature of the flowing air is provided in the nozzle hole of the air dispersion portion provided in the hearth. .