JPS609556Y2 - waste melting furnace - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention connects an annular supply path for lowering the processed material under its own weight in a filled state over the entire circumference of a combustion chamber equipped with a downward burner, and This invention relates to a waste melting furnace in which a gas discharge passage and a melt extraction passage are connected to the center of the bottom of the combustion chamber.

[Conventional technology]

Generally, this type of waste melting furnace has one combustion burner installed on the ceiling wall in the center of the combustion chamber, so that the flame and flame caused by the burner in the center of the combustion chamber are The influence of high-temperature gas is particularly strong, and there is a problem in that it is difficult to make sufficient contact between the material to be incinerated and the flame near the periphery of the combustion chamber.

Therefore, as a means to eliminate such inconveniences, for example, as shown in Japanese Patent Publication No. 41-11038, the flow of combustion air supplied around the burner can be effectively utilized, that is, There is a known technique in which a guide for swirling combustion air is provided around the burner to generate a swirling flow within the combustion chamber, thereby spreading the burner flame and high-temperature gas close to the periphery of the combustion chamber. .

[Problem that the invention attempts to solve]

The conventional structure is effective in generating swirling flow as described above, but since the guide only has the function of controlling the direction of air supply to the combustion chamber, When the amount of air supplied is changed, the swirling speed of the swirling flow fluctuates significantly, making it difficult to obtain a stable combustion state.

The technical problem to be solved by the present invention is that when generating a swirling flow using the combustion air in this type of waste melting furnace, even if the supply amount of combustion air is changed, the swirling flow It is important to devise measures so that the turning speed of the machine does not change significantly.

[Means for solving problems]

The technical means of the present invention designed to solve the above problem is to connect an air tact to the combustion chamber to supply combustion air through the top wall of the combustion chamber around the burner, and to An axial flow swirler for combustion air is provided between the inner circumferential wall of the wind box and the burner, and the blades constituting the axial flow swirler are adjusted in position around the burner by a drive device, and the upper end a movable right side plate with a first fan-shaped top piece connected to the top, and a fixed fan-shaped second top piece that is attached to the inner peripheral wall side of the wind box and overlaps the first top piece vertically at the top end. and a left side plate of the axial flow swirler, and the axial flow swirler is configured as an axial flow swirler with a variable blade thickness that allows the passage opening amount of the combustion air to be adjusted by operating the drive device. A damper for controlling the amount of air supplied to the combustion chamber side is provided at a position above the axial flow swirler in the supply flow path for combustion air, and the damper is linked to the control of the amount of air supplied to the combustion chamber. An adjustment mechanism is provided that controls the drive device, adjusts the opening amount of the axial flow swirler, and suppresses changes in the jetting speed of combustion air from the swirler.

[Effect]

According to the above technical means, when the damper is used to control the air supply amount to the combustion chamber, the drive device operates in conjunction with this supply amount control, and the opening due to the change in the blade thickness of the axial flow swirler is activated. By adjusting the amount, changes in the jetting speed of combustion air are suppressed.

For example, when the damper is throttle-controlled, the movable right side plate that makes up the blades of the axial flow swirler moves away from the fixed left side plate attached to the inner peripheral wall of the wind box. It is moved by the drive device, and the opening amount of the axial flow swirler is reduced in the same way as the damper.

[Effect of idea]

According to the above means of the present invention, the combustion air is swirled around the burner nozzle and the combustion air is ejected and supplied throughout the combustion chamber, so that the combustion reaction can be promoted and the combustion flame and It goes without saying that it is possible to diffuse high-temperature combustion gas into the combustion chamber, increase the amount of heat generated, increase convection, and increase the amount of heat transfer relative to width, thereby effectively improving incineration capacity and saving fuel. In particular, in the present invention, even when the combustion air supply amount is controlled in response to load fluctuations, the change in the injection speed of the supply air into the combustion chamber is suppressed, and the swirling performance of the combustion air is not changed. It has the advantage of being able to cope with load fluctuations and maintaining good combustion by making full use of the characteristic of supplying combustion air in a swirling manner.

〔Example〕

Embodiments of the configuration of the present invention will be described below with reference to the drawings.

A hearth 1 having a rising wall 1a on its periphery is provided with a gas discharge passage and a melt extraction passage 2 in the center thereof so as to be freely driven and rotatable around a vertical axis P, and is concentric with the rotation axis P. A downward-facing burner 3 and a downwardly expanding ceiling wall 4 equipped with a combustion air supply device 10 are provided above the hearth 1 to form a combustion chamber A.
It consists of:

A cylindrical wall body 5a is provided upright on the circumference of the ceiling wall 4, and a cylindrical wall body 5b is provided so as to be relatively rotatable while being connected to the rising wall 1a of the hearth periphery. A downward supply path B for filling the object to be treated is configured to supply the object all around the combustion chamber A.

A post-combustion burner 6 and a flue 7 are provided in the melt extraction path 2.
In addition, a melt cooling and recovery device 9 having a sand seal or water seal structure is connected to the flow path 8. These configurations, the combustion chamber A, and the descending supply path B can be used in various ways. This is a furnace for incinerating and melting industrial waste.

As shown in FIG. 2 of the drawings, the combustion air supply device 10 includes a wind box 16A1 corresponding to the tip portion of the air duct 16 that supplies combustion air through the top wall 4 portion of the combustion chamber around the burner 3. It also includes an axial flow type swirler S provided between the inner circumferential wall of the wind box I6A and the burner 3.

The axial flow swirler S uses blades 11 to apply swirling force to the combustion air, and adjusts the thickness of the blades to
The structure is such that the amount of opening through which combustion air passes through the swirler S can be changed by adjusting the gap between the two.

That is, the blade 11 is connected to the cylinder 1 as a driving device.
3, the first upper piece 1 is attached to the cylindrical member 12 whose position around the burner 3 is adjusted, and the fan-shaped first upper piece 1 is attached to the upper end.
A movable right side plate 11A in which the wind box 1a is connected, and a fixed left side plate which is attached to the inner circumferential wall side of the wind box 16A and has a fan-shaped second upper piece 11b connected to the first upper piece 11a vertically overlapping the first upper piece 11a at the upper end. It is composed of a plate 11B.

Further, as shown in FIG. 1 of the drawings, the air duct 16 is connected to the air supply blower 14 via a damper 15 for changing the amount of air supplied according to the combustion load. The control unit 15a of the blade thickness and the control unit 13a of the drive device 13 for adjusting the blade thickness control the air jet speed from the axial flow swirler S in conjunction with throttle control of the damper 15 to reduce the combustion load. They are electrically linked via an opening amount changing mechanism 18 to suppress the change.

Therefore, the combustion air supplied into the wind box 16A through the air duct 16 flows into the combustion chamber A along the inclination of the blades 11 of the swirler S, around the entire circumference of the spout 3a of the burner 3, and around the burner axis. At the same time, the position of the movable right side plate 11A is changed in conjunction with throttle control of the damper 15, and the swirling flow velocity of the ejected air is automatically maintained substantially constant regardless of combustion load control.

In the above-described embodiment, the drive device 13 and the control sections 13a and 15a of the damper 15 are electrically linked, but in another embodiment, the control sections 13a and 15a are mechanically linked to create an opening amount changing mechanism. 18, or the opening amount of the axial flow swirler S may be changed by a motor or the like. In other words, the specific means of the opening amount changing mechanism 18 and the drive device 13 can be changed in various ways.

[Brief explanation of the drawing]

The drawings show an embodiment of the waste melting furnace according to the present invention.
The figure is an overall longitudinal side view, and FIG. 2 is a cutaway perspective view of the combustion air supply device.

Claims (1)

[Scope of utility model registration request] An annular supply path B for lowering the processed material under its own weight in a filled state is connected to the entire circumference of the combustion chamber A provided with the downward burner 3, and a gas discharge path and molten material removal path is provided at the center of the bottom of the combustion chamber A. In the waste melting furnace, an air duct 16 is connected to the combustion chamber A, which supplies combustion air through the top wall 4 of the combustion chamber around the burner 3, and a wind box 16A at the tip of the air duct is connected to the combustion chamber A. An axial swirler S for combustion air is provided between the inner peripheral wall and the burner 3, and the blades 11 constituting the axial swirler S are connected to the drive device 1.
3, the position around the burner 3 is adjusted, and the movable right side plate 11A has a sector-shaped first upper piece 11a connected to the upper end thereof, and the movable right side plate 11A is attached to the inner circumferential wall side of the wind box 16A, and the upper end thereof is attached to the upper end thereof. The axial flow swirler S is operated by the drive device 13 to control the combustion flow. It consists of an axial flow swirler with variable blade thickness that can adjust the amount of air passage opening, and the combustion chamber is located at a position on the upper side of the combustion air supply passage than the axial flow swirler S. A damper 15 is provided to control the amount of air supplied to the A side,
The driving device 13 is controlled in conjunction with the air supply amount control by the damper 15, and the opening amount of the axial flow swirler S is adjusted to control the change in the jetting speed of combustion air from the swirler S. A waste melting furnace which is provided with an adjustment mechanism 18 for controlling the waste melting furnace.