JPH07310075A - Apparatus for collecting dust at oven opening of coke oven - Google Patents

Abstract

PURPOSE:To provide the subject apparatus, having a dust collecting hood of a specific constitution and capable of improving the dust collecting ability without increasing the suction air flow rate to a large volume due to the formation of a vortical flow for sucking a gas in a dust collecting duct with a rising air current of a dust-containing gas itself. CONSTITUTION:This apparatus is obtained by initially installing a dust hood 7 equipped with a top plate member 8, having an inner peripheral surface in an upward convex semicircular form and extending in the width direction of a coke oven (K), a pair of side plate members 9 closing both ends in the extending direction of the top plate member 8 and a suction port 10 opened to one of the side plate members 9 in the upper part on the side of a door 5 in an oven opening 2 of the coke oven (K) and further connecting a sucking means capable of sucking the air in the dust collecting hood 7, e.g. the sucking means constituted of a dust collecting main pipe 13, a branch duct 11 and a fan to the suction port 10. Thereby, a dust-containing gas at a high temperature leaked from the oven opening 2 is sucked while producing a horizontal vortical flow in the dust collecting hood 7 by the suction from the suction port 10 and a rising air stream of the dust-containing gas itself.

Description

Detailed Description of the Invention

The present invention relates to a coke oven in a coke oven for preventing gas leaking from between a door (furnace lid) and a kiln opening during carbonization and dust scattering from the kiln opening during coke extrusion. The present invention relates to a kiln mouth dust collector.

[0002]

2. Description of the Related Art In a coke oven, coal carried by a coal car is loaded into a carbonization chamber, and the coal is carbonized by receiving heat from an adjacent combustion chamber through a furnace wall for a certain period of time. When the carbonization is completed, the doors provided on both sides of the carbonization chamber are removed from the kiln opening, and the carbonized red hot coke is discharged to the outside of the furnace by the extruder. When the extrusion of coke is completed, the door is attached to the kiln again, and the process returns to the carbonization process.

By the way, the coal charged in the carbonization chamber generates a large amount of coal gas as the carbonization proceeds. The generated coal gas is sucked into drymen and recovered as fuel through an ascending pipe provided in the carbonization chamber, but the gas generation amount is large at the initial stage of carbonization, and the pressure in the carbonization chamber rises. For this reason, if there is a slight gap in the seal portion between the door frame of the kiln and the door due to the knife edge or the like, coal gas leaks from the gap and pollutes the environment near the furnace.

Also, during coke extrusion after carbonization, the hot air stream containing dust rises from the opening kiln,
This will pollute the environment near the furnace. In order to prevent these leaked gas and dust from scattering outside the furnace, a dust collecting hood that constitutes a kiln mouth dust collecting device has been conventionally installed above the door side of the kiln mouth. As shown in FIGS. 3 and 4, the dust collecting hood 30 has a pyramidal shape, and is provided downward so that gas and the like leaking from between the kiln opening 31 and the door 35 can be collected as much as possible. The diameter is expanding toward In addition, the dust collecting hood 30
A suction port 30a is opened at the upper part of the suction port 30a
A dust collecting main pipe 33 forming a suction unit is connected to the branch duct 32. The dust collecting main pipe 33 is connected to a fan via a dust collector. Incidentally, 31 in FIG. 3 and FIG.
a is a door frame provided on the outer peripheral edge of the kiln opening 31.

Then, the dust-containing gas leaked from the kiln port 31 is captured by the dust collection hood 30, and the captured gas or the like is sucked into the dust collection main pipe 33 from the suction port 30a to scatter the gas or the like. Was prevented.

[0006]

As described above, the conventional dust collector attempts to suck the dust-containing gas only by the suction air volume of the suction means. However, in general, when suctioning with the pyramid-shaped dust collecting hood 30, it is necessary to give a predetermined airflow velocity to the suction opening surface, but the influence range of the suction airflow velocity around the opening of this kind of hood 30 is The air velocity at an extremely narrow position separated from the opening surface by a distance equivalent to the opening size is reduced to about one-tenth of the velocity on the opening surface. Therefore, in order to provide a sufficient air velocity around the opening, an extremely large volume of suction air is required, and it is necessary to upsize the fan or the like that constitutes the suction means.

Further, there is a restriction on the size and the installation position of the kiln mouth 31 hood due to the coupling between the coke oven main body and a moving machine such as a coke guide wheel or an extruder. It was difficult for the dust device to completely suck the leaking gas from between the door and the kiln port 31 and the dust-containing airflow during coke extrusion. The present invention has been made in view of the above problems, and an object thereof is to improve the dust collecting ability of the device with a simple structure.

[0008]

In order to achieve the above object, the coke oven kiln mouth dust collector of the present invention is a dust collector that sucks dust-containing gas leaking from the coke oven kiln mouth to collect dust. There, the inner peripheral surface is a semi-circular shape that is convex upward and extends in the furnace width direction; A dust collecting hood including a side plate portion and a suction port opened in one of the pair of side plate portions is provided above the door side of the kiln port, and the dust collecting hood is provided by suction means connected to the suction port. It is characterized by sucking the atmosphere inside.

[0009]

The door leaking gas and the dust-containing airflow at the time of extrusion are high in temperature by themselves, and therefore rise as they rise out of the kiln opening. Then, the ascending air current enters the dust collecting hood provided above the door side of the kiln opening. The ascending air current in the dust collecting hood swivels by itself by moving along the inner peripheral surface of the top plate, and the swirling center is centered on the negative pressure generated by suction from the suction port. As a result, a substantially horizontal tornado-like swirling flow is generated between the pair of side plates in the dust collecting hood, and the rising airflow that is sequentially rising is sucked from the suction port while being entrained in the swirling flow. It is guided to the main dust collecting main through the branch duct.

As described above, the rising energy of the upward flow of the dust-containing gas is converted into swirl energy, and the swirl flow is generated by the swirl energy, so that the dust collection hood is not required to increase the suction air volume. An extremely high-speed control wind velocity for sucking gas can be provided over the entire width between the inner side plates, and the uniform flow velocity range around the hood opening is expanded to a range several times that of the conventional hood.

[0011]

Embodiments of the present invention will be described with reference to the drawings.
The coke oven K of the present embodiment is a horizontal chamber type coke oven K in which the carbonization chamber 1 and the combustion chamber are alternately arranged while being partitioned by a brick wall. Each carbonization chamber 1 extends in the horizontal direction, and kiln ports 2 are formed at both ends in the extending direction. In addition, in FIG. 2, 3 is a furnace clamp. Further, the coke oven is not limited to the horizontal chamber type. Further, a charging port is provided in the upper part of the carbonization chamber, and coal can be charged into the carbonization chamber from the charging port.

As shown in FIGS. 1 and 2, the kiln mouth 2 has an opening capable of discharging a caustic formed by the carbonization of coal 4. A door 5 (furnace lid) capable of sealing the opening is detachably attached to the kiln opening 2. The sealing method between the door 5 and the kiln opening 2 of this embodiment is such that a door frame 2a is provided along the outer peripheral edge of the kiln opening 2,
The door frame 2a is brought into contact with the sharp edge of a knife edge 5a protruding from the main body of the door 5.

A dust collecting hood 7 is arranged above the door 5. The dust collecting hood 7 includes a top plate member 8 and a pair of side plate members 9. The top plate member 8 is fixed to the furnace outer wall above the door side of the kiln port 2, and its shape is the door 5
And a ceiling surface thereof has a vertical semi-circular cross section with an upward convex shape.

Both end portions of the top plate member 8 in the extending direction are closed by side plate members 9, respectively. The side plate member 9 is
Each of them extends downward, and the lower part thereof extends outward downward to form a skirt portion 9a. One of the pair of side plate members 9 has a suction port 1 at a central position of its upper portion.
0 is opened. A lower end of a branch duct 11 is connected to the suction port 10. Further, a damper 12 is attached in the middle of the branch duct 11 so that the amount of ventilation can be adjusted by, for example, connecting or blocking the dust collecting main pipe 13 and the suction port 10 of the dust collecting hood 7.

As described above, the dust-collecting hoods 7 having the above-mentioned structures are arranged above the kiln port 2 of each carbonization chamber 1.
An upper end portion of a branch duct 11 extending from each dust collecting hood 7 is connected to the dust collecting main pipe 13. The dust collecting main pipe 13 is connected to a fan via a dust collector, and can be sucked by operating the fan. The fan, the dust collecting main pipe 13, and the branch duct 11 constitute a suction means.

In the coke oven K equipped with the above dust collector, the kiln ports 2 on both sides are sealed as described above,
After charging the coal 4 from the charging port (see FIG. 3) to the upper part of the furnace,
By receiving heat from the adjacent combustion chamber through the furnace wall, the charged coal 4 is carbonized for a fixed time. During the above carbonization,
In particular, a large amount of coal gas is generated in the initial stage of carbonization. This coal gas is normally sucked by drymen through a rising pipe (not shown) and recovered as combustion gas. At that time, the pressure in the carbonization chamber 1 rises.

At this time, if a gap is formed in the seal portion by the knife edge 5a due to thermal distortion of the door 5,
The coal gas leaks out of the furnace through the gap. At this time, dust can be collected by opening the damper 12 above the kiln mouth. Since the leaked gas has a high temperature, it rises as an ascending airflow, enters the hood located above and changes into a horizontal swirl flow, and is sucked into the branch duct 11 by suction from the suction port 10. Dust collection main 13
Be led to. The coal gas sucked into the dust collecting main 13 flows through the dust collecting main 13 and is captured by the filter of the dust collector. Then, when the amount of generated gas decreases and the gas leakage stops, the damper is closed to stop the dust collection.

When the dry distillation is completed, the doors 5 provided on both sides of the carbonization chamber 1 are removed from the kiln port 2, and the dry-heated red hot coke is discharged to the outside of the furnace by an extruder. Even when the coke is extruded after the dry distillation, by opening the damper and restarting the dust collection, the hot air flow containing dust leaks from the opening kiln port 2 and rises, but the dust-containing gas also rises because of high temperature. It rises as an air flow, enters the hood located above, changes into a horizontal swirling flow within the hood, and is sucked into the branch duct 11 by the suction from the suction port 10 and guided to the dust collecting main pipe 13. Get burned. The coal gas sucked into the dust collecting main 13 flows through the dust collecting main 13 and is captured by the filter of the dust collector.

As described above, the gas leaked from the kiln opening 2 forms an ascending air current, rises, enters the dust collecting hood 7, and moves as it is along the semicircular ceiling surface, The rising energy of itself is converted into swirling energy, and a tornado-shaped swirling flow is formed by the negative pressure in the central portion due to the suction from the suction port 10. As a result, an extremely high-velocity suction airflow that entrains the rising gas is formed over the entire width between the side plate members 9 in the dust collecting hood 7.

As described above, since the swirling flow for sucking (engaging) the gas is formed in the dust collecting duct by the upward flow of the captured dust-containing gas itself, the amount of suction air by the fan constituting the suction means is increased. Even if the capacity is not large, the suction capacity of the dust-containing gas leaking from the kiln port 2 is improved. At this time, since the dust collecting hood 7 does not need to be upsized because the suction capacity is larger than in the conventional case, it is advantageous in terms of the connection with the mobile machine 17 or the like approaching the door 5.

[0021]

As described above, in the coke oven furnace dust collector of the present invention, the volume of suction air by the suction means such as a fan is increased by a simple means of devising the structure of the dust collection hood. The suction ability is improved without doing so, and it becomes possible to completely collect the air flow of the dust-containing gas that leaks from the kiln port during dry distillation or extrusion.

[Brief description of drawings]

FIG. 1 is a side view showing a dust collection hood of a coke oven kiln mouth dust collector according to an embodiment of the present invention, in a state of being attached to a kiln mouth.

FIG. 2 is a front view showing a dust collection hood of a coke oven kiln mouth dust collector of an embodiment according to the present invention, in a state of being attached to a kiln mouth portion.

FIG. 3 is a side view showing a dust collection hood of a conventional coke oven kiln mouth dust collector, which is attached to the kiln mouth.

FIG. 4 is a front view showing a dust collecting hood of a conventional coke oven kiln mouth dust collector, which is attached to a kiln mouth portion.

[Explanation of symbols]

 K Coke oven 1 Carbonization chamber 2 Kiln port 4 Coal 5 Door 7 Dust collection hood 8 Top plate member 9 Side plate member 10 Suction port 11 Branch duct 13 Dust collection main

Claims (1)

[Claims] 1. A dust collector for sucking dust-containing gas leaking from a kiln opening of a coke oven and collecting the dust, the inner circumferential surface of which has a semicircular shape convex upward and extends in the width direction of the furnace. A dust collecting hood provided with a top plate part, a pair of side plate parts extending in the up-down direction and closing both ends in the extending direction of the top plate part, and a suction port opened in one of the pair of side plate parts. Is provided above the door side of the kiln opening and is provided with a suction means connected to the suction opening and capable of sucking the atmosphere in the dust collecting hood, and the high temperature dust-containing gas leaked from the suction and the kiln opening And the ascending current that
A coke oven kiln port dust collector which sucks the dust-containing gas while generating a horizontal swirling flow in the dust hood.