JPS6318993B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a coke oven oven mouth dust collection method for collecting dust gas leaking from the oven mouth of a coke oven through a hood installed above the oven mouth of the coke oven. This invention relates to an improvement in the method of opening and closing a damper installed in a vehicle.

Generally, in coke manufacturing plants, a large amount of dust gas is generated when loading coal into a coke oven and when taking coke out of the coke oven's kiln. It is necessary to remove the duct gas.

Conventionally, as a method for effectively collecting dust gas generated from the kiln mouth on the coke guide car side of a coke oven, for example, a dust collection duct was installed above the kiln mouth of the coke oven via a damper operated by an air cylinder. Some kiln furnaces are equipped with a hood that communicates with the kiln, and when the kiln mouth is opened, the damper is opened to suck and collect dust gas leaking from the kiln mouth into the hood. In this collection method, the air cylinder is electrically driven by remote control from the worker who is generally driving the coke guide car. Compared to mechanical means that open and close a damper with a counterweight using a hydraulic cylinder installed on the side, it not only has a simpler structure, but also has the advantage of ensuring reliable opening and closing operation and easier maintenance. .

However, in the conventional damper opening/closing method described above, air switching for the air cylinder drive source was performed using a solenoid switching valve operated by an electric signal remotely controlled by an operator. The electrical wiring and solenoid switching valves installed in the coke oven were prone to electrical troubles due to the high temperature atmosphere above and around the hood. As a result, the damper may malfunction due to the above electrical trouble, and the damper may not open during dust gas collection, or may close during dust gas collection, causing dust gas to scatter around, worsening working environment conditions. In addition to the problem of storage, there was also the risk of electrical leakage. Furthermore, the above-mentioned conventional electrical switching means has a problem in that when an electrical trouble occurs, it cannot be immediately dealt with by manual switching.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to enable the damper to open and close without malfunction, thereby ensuring that dust gas is not scattered to the surrounding area. The aim is to prevent this and improve the work environment. The gist of the present invention is that, when the coke oven kiln mouth is opened, the coke working vehicle, which is placed close to the kiln mouth, has a pilot valve installed in the hood of the coke oven that controls an air pressure signal. A push lever is installed, and the extension of the push lever pushes a pilot valve, thereby generating an air pressure signal, and the air pressure signal operating a switching valve for switching the drive source of the cylinder. The present invention provides a method for opening and closing a damper of a dust collection hood at a kiln opening in a coke oven.

The present invention will be described in detail below based on embodiments shown in the accompanying drawings.

FIG. 1 and FIG. 2 show an embodiment of a damper opening/closing device in a dust collection hood at the furnace entrance of a coke oven. In this embodiment, 1 is a coke oven, and 2 is a coke discharge side kiln port 3 of the coke oven 1.
4 is a furnace lid that closes the kiln mouth 3, and 5 is a back stay that is installed on the left and right sides of the kiln mouth 3. And this backstay 5
A dust collecting hood 6 disposed above the kiln mouth 3 of the coke oven 1 is fixed to the coke oven 1 . This hood 6
The hood 6 has an inlet 7 facing downward near the upper end of the kiln mouth 3, and the outlet side of the hood 6 is connected to a dust collector (not shown) installed at the end of the furnace. A damper 30 is provided at the joint portion of the hood 6 and the duct 8 to open or close the entrance of the duct 8. This damper 30 has an upper edge fixed to a rotating shaft 9 that spans both side walls of the hood 6, and one end of this rotating shaft 9 is connected to an air cylinder 10 disposed above the hood 6. It is attached to the tip of the rod 11 via the link 12, and this rod 11
Opening and closing operations are possible by the expansion and contraction movements of the

Further, a drive air switching valve 14 that can be manually switched is installed near the air cylinder 10 on the hood 6 as a switching valve for switching the drive source of the air cylinder 10, and a coke guide wheel on the hood 6 Pilot valves 13a and 13b are installed on the second side to operate the driving air switching valve 14 by controlling pilot air pressure.

Of the pilot valves 13a and 13b, one valve 13a is used for opening the damper, and the other valve 13b is used for closing the damper,
As shown in FIGS. 2 and 3, the actuating lever 15 is assembled into the pilot valves 13a and 13b.
The air flow can be switched between the forward direction and the reverse direction by moving forward and backward movement of a and 15b. The forward movement of the operating levers 15a, 15b is as follows:
Push levers 17a, 17b of hydraulic cylinder devices 16a, 16b installed on the coke guide car 2 correspond to these pilot valves 13a, 13b.
, and the backward movement is performed using the operating levers 15a, 15.
Return springs 18a, 18 wrapped around b
This is possible due to the resilience of b.

On the other hand, the drive air switching valve 14 is connected to the pilot valves 13a and 13b through pilot circuits 19a and 19b, respectively, as shown in FIG. Therefore, the switching operation is performed, and compressed air as a driving source for the air cylinder 10 can be supplied to the A chamber or the B chamber of the air cylinder. In addition, the pilot circuit 19
If pilot air pressure is not supplied to either a or 19b, drive air switching valve 1
4 can be manually switched, and for example, even in the event of a failure in the air pressure signal system circuit, manual switching can be used.

The air circuit of the damper opening/closing device configured as described above will be explained based on FIG. 3, which shows the state of the air circuit when the damper 30 is closed, for example. The air supply source 20 and the driving air switching valve 14 are connected through a single air supply main pipe 21, and the driving air switching valve 14 and the chambers A and B of the air cylinder 10 are Two air supply branch pipes 23,
24, respectively. The air supply main pipe 21 also has two branch pipes 25a,
25b is connected, and these two branch pipes 2
5a, 25b are each pilot valve 13a, 1
3b, and a part of the compressed air for driving the air cylinders 10 is used as pilot pressure.

Next, the operation of the damper opening/closing device having the above configuration will be explained.

FIG. 3 shows the state of the air circuit when the damper 30 is closed during coal carbonization. In this state, both pilot valves 13a and 13b are not operating, and compressed air supplied from the air supply source 20 is supplied to chamber A of the air cylinder 10 via the drive air switching valve 14. , the rod 11 of the air cylinder 10 is contracted and the damper 30 is in a closed state. Next, the damper 30 is set to the open state when carbonization of coal is completed and coke is to be discharged from the kiln. The coke guide car 2 is moved and arranged so that the hydraulic cylinders 16a and 16b correspond to each other.
The hydraulic cylinder 16a for opening is operated from the driver's cab. This driving operation causes the hydraulic cylinder 16
The push-out lever 17a of a is extended and pushes the operating lever 15a of the open-side pilot valve 13a installed in the hood 6. And this operating lever 15a
The forward movement of the pilot valve 13a switches the pilot valve 13a, and an air pressure signal (compressed air) is sent to the drive air switching valve 14 via the pilot circuit 19a. Then, the drive air switching valve 14 is switched by this air pressure signal, cylinder drive air from the air supply source 20 is supplied into the B chamber of the air cylinder 10, and the rod 11 moves forward. As the rod 11 moves forward, the damper 30 connected to the rod 11 via the link 12 rotates about the rotation shaft 9, and the damper 30 is opened. In the second state, the kiln mouth 3
Dust gas generated as a result of the coke being carried out to the coke guide car 2 side is sucked into the hood 6, passes through the damper 30 in an open state, and is guided into the duct 8. On the other hand, the hydraulic cylinder 16a is instantly returned to its original state after operating the pilot valve 13a, and the operating lever 15
a is retreated by the restoring force of the return spring 18a, and accordingly the pilot valve 13a is also switched to its initial state. By switching the pilot valve 13a, the air pressure signal to the driving air switching valve 14 is cut off, but since the driving air switching valve 14 maintains the above-mentioned switched state, the air pressure signal in the B chamber of the air cylinder 10 is Driving air continues to be supplied to keep the damper 30 open. After the coke has been removed,
When closing the damper 30 again, the closing hydraulic cylinder 16b is operated from the driver's cab of the coke guide car 2, and the push lever 17b of the hydraulic cylinder 16b is pressed.
and push the operating lever 15b of the closing-side pilot valve 13b installed in the hood 6. The pilot valve 13b is switched by the forward movement of the operating lever 15b, and the drive air switching valve 14 is switched through the other pilot circuit 19b.
An air pressure signal (compressed air) is sent to.
In response to this air pressure signal, the drive air switching valve 14 is switched to the opposite side, cylinder drive air from the air supply source 20 is supplied into the A chamber of the air cylinder 10, and the rod 11 is moved backward. This backward movement of the rod 11 causes the damper 30 to rotate in the opposite direction via the link 12, thereby closing the entrance of the duct 8. Furthermore, by cutting off the drive signal for the closing hydraulic cylinder 16b, the push lever 17b is retracted, and at the same time, the operating lever 15b of the pilot valve 13b is retracted. With this backward movement, the closing pilot valve 13b is switched and the air pressure signal to the driving air switching valve 14 is cut off, resulting in the same state as shown in FIG. 3, but the driving air switching valve 14 is Since the state is maintained, compressed air from the air supply source 20 continues to be supplied into the A chamber of the air cylinder 10, and the damper 30 is maintained in the closed state.

The pilot valve and drive air switching valve used in the above embodiments may be those commonly used as switching valves. In addition, in the above embodiment, a method for collecting dust gas generated from the kiln port on the side of the coke guide car of a coke oven was explained, but the present invention is also applicable to a method for collecting dust gas generated from the kiln port on the side of the extruder. Of course it can be done.

As explained above, according to the method for opening and closing a damper for a kiln mouth hood according to the present invention, the driving source of the cylinder for opening and closing the damper is switched by an air pressure signal, so that it is possible to switch the driving source of the cylinder for opening and closing the damper using an air pressure signal. In addition to the effect that the opening and closing operation of the damper can be made more reliable than in the case where the damper is closed, it is also possible to obtain a safe working environment by eliminating dangers such as fires and short circuits in electrical wiring. In addition, pilot air can be used by being guided from the air supply source installed above the coke oven.
The installation and maintenance of the air piping is easy, and the equipment cost can be reduced.

Furthermore, the driving air switching valve is switched by the pilot pressure from the pilot valve, and can also be switched manually.
For example, even if the air pressure signal system circuit breaks down, it can be dealt with immediately.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the vicinity of the coke oven mouth showing an embodiment of the damper opening/closing device for carrying out the method according to the present invention, and FIG. 2 is a schematic plan view of the damper opening/closing device seen from above the coke oven. FIG. 3 is an air circuit diagram showing the operation of the switching valve as the damper opens and closes. 1... Coke oven, 2... Coke guide vehicle (coke oven working vehicle), 3... Kiln mouth, 6... Hood, 8... Duct, 10... Air cylinder, 13a... Opening side pilot valve, 13b... Closing side pilot valve, 14 ... Drive air switching valve, 17... Push lever, 30... Damper.

Claims (1)

[Claims] 1. A hood is disposed above the kiln mouth of the coke oven and communicates with the duct via a damper operated by a cylinder, and when the kiln mouth is opened, the damper is opened to drain the dust gas leaking from the kiln mouth. In a coke oven kiln mouth dust collection method in which dust is collected by suction into a hood, a coke working vehicle placed close to the coke oven kiln mouth when the coke oven mouth is opened is equipped with an air pressure signal installed in the hood. A push lever is installed near the pilot valve that controls the cylinder, and the extension of the push lever pushes the pilot valve, thereby generating an air pressure signal, and this air pressure signal drives the drive source of the cylinder. A method for opening and closing a damper of a dust collection hood in a coke oven, characterized by operating a switching valve for switching.