JPH0316000Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a combustion device for a kiln that burns limestone, dolomite, etc. The present invention relates to a combustion device for a firing furnace equipped with a dust evacuation device for

[Prior Art] For example, in a firing furnace such as a vertical firing furnace, which is equipped with a system in which gas in the furnace, such as cooled gas of the fired product, is circulated and sent into the combustion chamber of a combustion device via an injector. The in-furnace gas sent from the injector contains dust, and this dust accumulates in the lower part of the combustion chamber.

Therefore, in order to remove such dust, the dust was removed by opening an exhaust manhole provided outside the lower part of the combustion chamber and blowing out the dust.

[Problems that the invention aims to solve] However, when dust accumulates in the lower part of the combustion chamber, if a method is adopted in which the dust is manually discharged, as the amount of accumulated dust increases, it becomes difficult to circulate the dust inside the furnace. The amount of unrecovered dust that flows into the furnace with the gas increases, which adversely affects combustion and causes troubles due to dust in the furnace.

Furthermore, when the dust is manually discharged, air is sucked into the furnace, which has a negative effect on combustion conditions and temperature control.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention has a method that is provided facing the firing chamber of the firing furnace and has an inlet for gas containing dust. , in a combustion device for a sintering furnace having a combustion chamber formed of a smooth curved inner wall surface that causes the dust-containing gas to generate a swirling flow in a vertical plane, A configuration was adopted in which a dust exhaust port was provided on the lower inner wall surface of the combustion chamber on the downstream side, and a dust exhaust valve with an airtight function was connected to the dust exhaust port.

[Operation] When gas containing dust is introduced into the combustion chamber of a combustion device from the gas introduction part, this gas generates a swirling flow in a vertical plane, and centrifugal force is applied to the dust contained in the gas. , the dust is guided to the inner wall surface of the combustion chamber and moves along the inner wall surface. The dust moving along the inner wall surface in this way is located downstream of the gas introduction section in the gas flow direction, and reaches the dust outlet opened in the inner wall surface at the bottom of the combustion chamber, where it reaches the dust outlet. The dust is trapped and discharged downward by gravity, and is automatically discharged to the outside by an airtight dust discharge valve.

[Example] Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIGS. 1 and 2 illustrate an embodiment of the present invention, and show an enlarged view of a combustion chamber of a combustion device of a kiln.

In the figure, what is indicated by the reference numeral 1 is a combustion device attached to the outer cylinder 12 of the firing furnace.This combustion device 1 is composed of a combustion chamber 2, a burner 3, etc. As shown, the firing chamber is exposed through the outer cylinder 12 of the firing furnace.

The burner 3 is provided on the outer wall 2a of the combustion chamber 2 and emits flame toward the inside of the combustion chamber 2.

As shown in FIG. 1, the inner wall surface of the combustion chamber 2 is formed into a spiral shape by the lining bricks 5, and an injector (not shown) is connected to the upper part of the combustion chamber 2 to collect dust from the furnace. A gas introduction part 4 for introducing internal gas into the combustion chamber 2 is formed along the tangential direction of the combustion chamber 2. The shape of the combustion chamber 2 is not limited to the spiral shape as described above, but may be circular or the like.In short, it is formed with a smooth curved surface, and the shape of the combustion chamber 2 is not limited to the spiral shape as described above. It is possible to give a swirling flow to the flow.

In addition, as shown in FIG. 1, it is located approximately 180 degrees apart in the circumferential direction from the opening end of the gas introduction section 4 into the combustion chamber 2, and is located downstream of the gas introduction section 4 in the gas flow direction. 2 along the flow direction of the furnace gas on the inner wall surface of the combustion chamber 2 on the lower inner wall surface of the combustion chamber 2 which is the side.
Two dust exhaust ports 8 and 9 are formed in communication with the combustion chamber 2.

Among these discharge ports 8 and 9, the entrance of the discharge port 9 on the downstream side in the gas flow direction is formed to be large.
Further, the entrances of these dust discharge ports 8 and 9 are formed with wide openings so that dust can easily enter.

Further, an opening 6 for internal inspection is formed along the tangential direction of the inner wall surface of the combustion chamber 2, which is an extension of the opening positions of the two dust exhaust ports 8 and 9, and the outer end thereof is connected to the manhole cover. It is blocked by 7.

The dust outlet 9 on the downstream side in the gas flow direction is opened and located near the bottom of the base 6a of the upper wall of the opening 6, as shown in FIG.

The two dust discharge ports 8 and 9 are connected to a discharge chute 10.
0 is connected to an air damper 11 as a dust discharge valve having an airtight function. This air damper 11 continuously discharges dust while performing air sealing. Note that the aerodynamic damper 11 may be automatically operated at regular intervals using a timer or the like, for example.

Next, the operation of this embodiment configured as above will be explained.

The furnace gas fed by the injector through the furnace gas introduction part 4 swirls along the inner wall of the firing chamber 2 .

Due to the centrifugal force generated by this flow, the dust contained in the furnace gas gathers on the inner wall side of the combustion chamber 2, and on the side of the opening 6 formed in the tangential direction of the combustion chamber 2 at the lower part of the combustion chamber 2. guided by.

However, at the base of the opening 6, there is a dust outlet 8,
9, dust enters these discharge ports 8 and 9.

That is, dust with high kinetic energy is guided to the outer dust outlet 9, and dust with low kinetic energy is guided to the inner outlet 8 and collected at the exhaust chute 10. Note that since the upper wall 6a of the opening 6 is located near the upper part of the dust outlet 9 formed on the downstream side in the gas flow direction, a portion of the dust with large kinetic energy collides with this upper wall 6a. It then stalls and falls into the dust outlet 9 below, ensuring that the dust is captured.

The dust collected in the discharge chute 10 is air-sealed by an air damper 11 and is sequentially discharged and guided to a dust hopper (not shown).

A part of the furnace gas from which the dust has been separated is used as combustion air for the burner 3, and the rest is discharged from the combustion chamber 2 together with the combustion gas of the burner 3 and supplied to the firing chamber in the firing furnace. Used for firing limestone, etc.

As described above, dust is automatically discharged without accumulating in the lower part of the combustion chamber 2.

Therefore, the amount of dust flowing into the firing furnace is significantly reduced, the combustion condition is maintained in good condition, and troubles due to dust in the furnace do not occur.

Furthermore, since dust is automatically discharged by the air damper 5 even during operation, it becomes easy to control and control the combustion temperature, etc., and there is no need to clean the bottom of the combustion chamber 2.

In addition, in the above embodiment, the dust outlet is provided at two locations in the lower part of the combustion chamber 2, one on the upstream side and one on the downstream side with respect to the flow direction of the gas in the furnace, but this is not necessarily limited to this. Depending on the dust concentration, it may be possible to provide only one location, or three or more locations may be provided. Furthermore, it goes without saying that an air feeder (rotary valve) may be used in place of the air damper 11.

On the other hand, FIG. 3 shows another embodiment of the present invention, and corresponds to FIG. 1.

In this embodiment, the dust outlet 13 is provided at only one location with a relatively large opening, and the dust coming along the inner circumferential wall of the combustion chamber 2 enters the dust outlet 13. The structure is designed to facilitate the inflow of information. In addition, in this example, for dust having larger kinetic energy,
Using a part of the inner wall of the dust outlet 13, a part of the dust swirling along the inner circumferential wall of the combustion chamber 2 and having a large kinetic energy is caused to collide with a part of the inner wall of the dust outlet 13 to generate kinetic energy. By absorbing the dust and letting it fall into the dust outlet 13, the dust can be captured more reliably. That is, the upper portion 13a of the inner wall of the dust outlet 13 on the downstream side in the gas flow direction is located above the position of the starting point 13b of the dust outlet 13 on the inner peripheral wall surface of the combustion chamber 2 on the upstream side in the gas flow direction. A portion of the dust with high kinetic energy collides with the upper wall 13a of the dust outlet 13, stalls, and falls into the dust outlet 13. With this configuration, dust swirls along the inner circumferential wall surface of the combustion chamber 2 and naturally flows into the dust outlet 13 and is discharged, and dust with large kinetic energy also flows into the dust outlet 13. upper wall 13a of
The dust collides with the dust, falls, flows into the dust discharge port 13, and is discharged.

In the embodiments described above, the introduction portion 4 of the gas containing dust into the combustion chamber 2 is formed tangentially from above to below the combustion chamber 2. However, the present invention is not limited to this case, and for example, as shown in FIG. It can be provided at an appropriate location, such as The positions where these gas introduction parts 4 are provided are upstream in the gas flow direction of the dust exhaust ports 8, 9, and 13 provided at the lower part of the combustion chamber 2, and the gas containing dust introduced into the combustion chamber 2 is Needless to say, it is provided at a position where a necessary distance is maintained so that a swirling flow is applied and the dust travels to the peripheral wall of the combustion chamber 2 due to centrifugal force.

[Effects of the invention] As is clear from the above explanation, the present invention has the structure described in the claims for utility model registration, so that dust can be prevented from accumulating at the bottom of the combustion chamber of the combustion device during operation. Dust can be automatically discharged outside the combustion chamber while air-sealing, reducing the amount of dust flowing into the firing furnace and preventing troubles caused by dust inside the furnace. Further, the combustion state is not inhibited by dust, and good combustion is performed. At the same time, atmospheric air does not flow into the combustion chamber from the outside, and combustion management is easily performed.

[Brief explanation of the drawing]

The drawings are for explaining the embodiment of the present invention, and the first drawing is for explaining the embodiment of the present invention.
Figure 2 shows a front sectional view of the combustion device.
2 is a vertical sectional side view taken along the line 1 to 1 of FIG. 1, and FIG. 3 is a front sectional view showing another embodiment of the present invention. 1... Combustion device, 2... Combustion chamber, 3... Burner, 4... Gas inlet, 6... Opening, 7... Manhole cover, 8, 9, 13... Dust outlet, 1
0...Dust exhaust chute, 11...Aerodynamic damper.

Claims (1)

[Scope of utility model registration request] It is provided facing the combustion chamber of the firing furnace, has an inlet for gas containing dust, and is formed of a smooth curved inner wall surface that causes the dust-containing gas to generate a swirling flow in a vertical plane. In a combustion device for a kiln having a combustion chamber, a dust outlet is provided on the lower inner wall surface of the combustion chamber, which is downstream of the gas introduction part in the gas flow direction, and connected to the dust outlet to provide an airtight function. A combustion device for a kiln, characterized in that it is provided with a dust discharge valve having a dust discharge valve.