JPH10267261A - Feed amount variable air nozzle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change an inside diameter of a nozzle and to perform regulation of an amount of air fed in a furnace by the change. SOLUTION: A fixed cylinder 1 is arranged in a state to extend through a furnace wall 7, and outer and inner moving cylinders 2 and 3 are concentrically arranged at the internal part of the fixed cylinder 1. Outer and inner drawing rods 4 and 5 respectively extending to the outside of an air duct wall 8 are arranged at the moving cylinders 2 and 3, respectively. The moving cylinders 2 and 3 are moved externally and internally of a furnace by the drawing rods 4 and 5. A guide rod to effect slide guiding of the moving cylinders 2 and 3 is arranged below the moving cylinders 2 and 3. An internal protrusion-form stopper 6 is formed on the front end of the fixed cylinder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle for supplying secondary air blown into an incinerator for combustion of unburned exhaust gas and stirring of the exhaust gas in, for example, a municipal waste incinerator. More particularly, the present invention relates to a variable air nozzle device capable of freely changing the amount of air to be supplied and supplied in accordance with a change in the quality of waste to be treated. Throughout this specification, the front-rear relationship is the inside of the furnace, that is, the right direction in FIG.

[0002]

2. Description of the Related Art In a refuse incinerator, combustion exhaust gas has different components depending on the substance to be incinerated. Therefore, secondary air is blown into a secondary combustion zone to completely burn unburned components and to increase the blowing force. The exhaust gas is agitated, but the amount of secondary air is limited as much as possible in consideration of minimizing the amount of exhaust gas treated downstream and suppressing the emission of harmful substances from incinerators. There is a need.

As a variable air blowing air nozzle in an incinerator, the same as the shutter mechanism of a camera is known as shown in FIG. That is, a large number of blades (52) are pivotally connected to the front end of a nozzle member (51) provided through the furnace wall (7) over the entire periphery thereof, and each blade (52) has a pivot point. It rotates uniformly around the center, so that the nozzle opening is narrowed, and the amount of air blown is controlled.

[0004]

However, in the variable supply air nozzle having the above structure, since the nozzle opening is restricted only at the front end, there is a dislike that the air blown into the furnace spreads.
As it does not reach the center of the furnace, the unburned portion cannot be completely burned.
In order to overcome this problem, it is necessary to inject more secondary air than necessary. However, if this is done, the amount of downstream processing gas increases, and it is necessary to provide a larger exhaust gas treatment device. Further, in the supply amount variable air nozzle having the above structure, the stirring effect by the secondary air is not sufficient, and therefore, it is necessary to increase the air blowing amount also from this point.

It is an object of the present invention to provide a variable supply air nozzle device that can solve the above-mentioned problems.

[0006]

According to the present invention, a fixed supply cylinder (1) is provided in a furnace wall (7) in a penetrating manner, and a plurality of deformable movable parts are provided inside the fixed cylinder (1). The cylinders (2) and (3) are arranged concentrically, and the movable cylinders (2) and (3) are provided with drawer rods (4) and (5) that reach the outside of the air duct wall (8), respectively. The movable cylinders (2) and (3) are moved in and out of the furnace by 4) and (5).

The fixed cylinder (1) may be provided horizontally on the furnace wall (7), or may be provided with a downward slope in the furnace direction.

Below the movable barrels (2) and (3), there is preferably provided a guide rod for slidingly guiding the movable barrels (2) and (3).

Preferably, an inwardly projecting stopper (6) is provided at the front end of the fixed cylinder (1).

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be specifically described with reference to the drawings.

In FIG. 1 to FIG. 4, a fixed tube (1) is provided horizontally through a vertical furnace wall (7) made of refractory brick of a refuse incinerator. The rear end of the fixed cylinder (1) is an air duct from the furnace wall (7).
The outer peripheral surface of the fixed cylinder (1) is welded to a steel shell (11) of a furnace wall (7). The outer movable cylinder (2) is arranged concentrically at a small interval inside the fixed cylinder (1), and the inner movable cylinder (3) is not closely spaced or closely concentric within the outer movable cylinder (2). It is arranged in a shape. The fixed cylinder (1), the outer movable cylinder (2) and the inner movable cylinder (3) have the same length, and the front end face of the fixed cylinder (1) is flush with the inner surface of the furnace wall (7).

At the rear end of the outer movable barrel (2) is provided a hairpin-shaped outer draw bar (4), and at the rear end of the inner movable barrel (3) is the same hairpin-shaped inner draw bar (5). Is provided. The rear ends of the outer drawer rod (4) and the inner drawer rod (5) penetrate the air duct wall (8), and the bent portion of the hairpin extends out of the duct from the air duct wall (8). The outer draw bar (4) supports the inner movable barrel (3) at a pair of straight rod portions.
Thus, the outer pull-out bar (4) not only pulls out or pushes in the outer movable barrel (2), but also serves as a guide rod for slidingly guiding the inner movable barrel (3). Under the outer movable cylinder (2), a pair of left and right guide rods (9) for supporting and slidingly sliding the outer movable cylinder (2) are disposed in parallel with the outer drawer rod (4), The rear end is fixed to the air duct wall (8). At the front end of the fixed cylinder (1), four inwardly projecting stoppers (6) are provided facing each other to prevent the outer movable cylinder (2) and the inner movable cylinder (3) from projecting into the furnace. doing.

In the air nozzle device having the above structure, in order to supply a large amount of air into the furnace, the outer drawer rod (4) and the inner drawer rod (5) are pulled outward from the furnace, and are indicated by broken lines in FIG. As shown, both the outer movable tube (2) and the inner movable tube (3) are retracted, and air is guided from the air duct (10) into the fixed tube (1) and is jetted into the furnace. In order to prevent the air jet from expanding in the furnace, it is preferable that the length (L) and the inner diameter (D) of the fixed cylinder (1) satisfy the relationship of L ≧ 5D.

Next, in order to supply a small amount of air into the furnace, the outer drawer rod (4) and the inner drawer rod (5) are pushed inward in the furnace, as shown by solid lines in FIG. Then, the outer movable cylinder (2) and the inner movable cylinder (3) are advanced together, and air is guided from the air duct (10) into the inner movable cylinder (3), and is jetted into the furnace.

When the nozzle is provided on the furnace wall (7) with a downward gradient in the furnace direction, the rear ends of the outer draw bar (4) and the inner draw bar (5) are connected to the air duct wall (5). The outer movable tube (2) and the inner movable tube (3) are moved toward the inside of the furnace by their own weight by removing the pin retained in (8), and air is drawn inward from the air duct (10) in the same manner as above. It is guided into the movable cylinder (3) and squirts into the furnace.

In order to supply a moderate amount of air into the furnace, only the outer movable cylinder (2) is advanced in the same manner as described above.

[0017]

According to the supply amount variable air nozzle device of the present invention, the nozzle inner diameter is appropriately moved by moving the plurality of deformed movable cylinders (2) and (3) inward and outward of the furnace with respect to the fixed cylinder (1). To adjust the air supply into the furnace. Thus, according to the variable air nozzle device of the present invention, it is possible to freely change the amount of air to be supplied and supplied in accordance with the change in the quality of waste to be treated, and to thereby efficiently agitate the combustion exhaust gas. Can be.

[Brief description of the drawings]

FIG. 1 is a vertical longitudinal sectional view showing an air blowing amount variable air nozzle device according to an embodiment.

FIG. 2 is a rear view of a rear portion of the nozzle device.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a front view of the nozzle device.

5 (a) is a longitudinal sectional view showing a conventional air blowing variable air nozzle, and FIG. 5 (b) is a front view thereof.

[Explanation of symbols]

 1: fixed cylinder 2: outer movable cylinder 3: inner movable cylinder 4: outer drawer rod 5: inner drawer rod 6: stopper 7: furnace wall 8: air duct wall 9: guide rod 10: air duct

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Morio Sugiura 5-3-28 Nishikujo, Konohana-ku, Osaka-shi Inside Hitachi Zosen Corporation (72) Ryozo Shiji 5-28-3, Nishikujo, Konohana-ku, Osaka-shi No. Within Hitachi Zosen Corporation (72) Inventor Seiichi Nakai Inside 3-5-28 Nishikujo, Konohana-ku, Osaka-shi Inside Hitachi Zosen Corporation

Claims (3)

[Claims] A fixed cylinder (1) is provided in the furnace wall (7) in a penetrating manner, and a plurality of deformed movable cylinders (2) and (3) are concentrically arranged inside the fixed cylinder (1). Movable barrels (2) and (3) are provided with drawer rods (4) and (5) that reach the outside of the air duct wall (8), respectively, and the movable barrels (2) and (3) are drawn by the drawer rods (4) and (5). A variable supply air nozzle device that moves in and out of the furnace. 2. The variable supply air nozzle device according to claim 1, wherein a guide rod for slidingly guiding the movable cylinders (2) and (3) is provided below the movable cylinders (2) and (3). 3. An inwardly projecting stopper at the front end of the fixed cylinder (1).
3. The variable supply air nozzle device according to claim 1, wherein (6) is provided.