JPH0566516B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a dust evacuation device for arc furnace equipment, and more specifically, a device for removing combustible substances in the gas by introducing exhaust gas containing dust from an arc furnace. It is used as a device to discharge dust that accumulates in the combustion tube.

BACKGROUND ART Conventional arc furnace equipment has a configuration as shown in FIG. 5, for example. In Figure 5,
31 is an arc furnace; 32 is a furnace lid; 33 is a combustion tube for introducing dust-containing exhaust gas from the arc furnace 31 to burn flammable substances in the gas; and 34 is a combustion tube that connects the arc furnace 31 and the combustion tube 33; A connected dust collection duct 35 is a gas outflow duct connected to the combustion tube 33 , and 36 is a manhole provided at the bottom of the combustion tube 33 . That is, the conventional method for discharging dust is a method in which a worker enters the inside of the combustion tube 33 through a manhole 36 provided in the combustion tube 33 during the furnace holidays of the arc furnace 31, and takes out the dust by input using a scoop or the like. be. In this case, the inside of the combustion tube 33 needs to be cooled to a temperature at which the operator can work.

Problems to be Solved by the Invention As mentioned above, in the conventional dust evacuation method, a worker enters the combustion tube 33 and performs the operation based on input, which requires heavy labor and also reduces dust evacuation. In order to make the work possible, rapid cooling is performed to lower the temperature inside the combustion tube 33 and dust collection duct 34, which causes a large loss of thermal energy and causes problems such as spalling of refractories. There is a problem. Recently, due to the extension of the life of the refractories in the arc furnace 31 and improvements in hot repair technology in the furnace, the interval between regular furnace holidays is becoming longer, but the interval between dust discharge operations is becoming shorter. . The present invention attempts to solve these problems. That is, the present invention can eliminate the need for manual dust removal work inside the combustion tube under high temperature and dust conditions, and can also minimize the temperature drop in the combustion tube and reduce thermal energy loss. The purpose of this invention is to provide a dust evacuation device for arc furnace equipment that can perform the following steps.

Measures to solve the problem: A removable dust receiver was installed at the lower end of the combustion tube, and it was replaced using a cartridge system. That is, the configuration of the present invention includes a combustion tube that introduces dust-containing exhaust gas from an arc furnace and burns flammable substances in the gas, and a combustion tube that is removably installed at the lower end of the combustion tube. The dust receiver is characterized by comprising a dust receiver that receives dust falling from the dust receiver, a dust discharge valve provided at the bottom of the dust receiver, and a moving device that moves the dust receiver up and down and horizontally.

Operation When the combustion tube is out of operation, the empty dust receiver is placed on a moving device, raised and attached to the lower end of the combustion tube. When the combustion tube is operated, dust falling from the combustion tube is collected in a dust receiver. After that, the operation of the combustion tube is temporarily stopped at an appropriate time, the dust receiver containing dust is separated from the bottom of the combustion tube, lowered by a moving device, and then moved sideways, and placed in an empty dust receiver prepared separately. Replace with container. Repeat this action. The dust receiver containing the dust is transported to the dust discharge position, and the dust discharge valve is opened to discharge the dust.

Embodiment FIGS. 1 to 4 show an embodiment of the present invention.

In Fig. 1, 1 is a combustion tube, 2 is a dust collector, 3 is a gas outlet duct, 4 is a frame, 5 is an iron shell,
6 is a refractory, 7 is a dust receiver, 8 is a dust discharge valve, 9 is a dust discharge chute, 10 is a moving trolley as a moving device, 11 is a lifting rail, 12 is a trolley stopper, 13 is a lifting jack, and 14 is a fixed It's a rail. Further, in FIG. 3, 15 is a fixed work floor, 16 is a dust discharge hopper, 17 is a dust discharge conveyor, and 18 is a dump truck for transporting dust.

The combustion tube 1 is supported by a frame 4, has a refractory material 6 such as a refractory brick inside an iron skin 5, and is connected to a dust collection duct 2 communicating with an arc furnace (not shown). A gas outflow duct 3 is also connected. That is, the combustion tube 1 introduces exhaust gas containing dust from an arc furnace and burns combustible substances in the gas, and is also called a buffer tube.

The dust receiver 7 is removably installed in the lower part of the combustion tube 1, and has a refractory material such as a refractory brick inside the iron shell, and a dust discharge valve 8 is installed in the lower part.
and a dust discharge chute 9 at the bottom.
, and is installed on the movable trolley 10.

The movable trolley 10 has four wheels and a self-propelled drive device, and can move on the lifting rail 11 and the fixed rail 14 while carrying the dust receiver 7 thereon.

When the movable carriage 10 moves to the center of the combustion tube 1, the elevating rail 11 moves up and down integrally with the movable carriage 10. As a safety device, a truck stopper 12 is provided at the travel limit of the movable truck 10.

The elevating jack 13 is provided at the lower part of the elevating rail 11 and raises and lowers the elevating rail 11.

The fixed rail 14 is a traveling rail for moving the movable cart 10, and as shown in FIG. It consists of two lanes up to parking lot 21. It should be noted that the dust receiver that has finished discharging dust at the dust discharge position 20 is moved to the standby position 21 and is kept on standby until it is replaced.

The dust discharging conveyor 17 is provided at a dust discharging position 20, and when the dust discharging valve 8 is opened, the dust discharging conveyor 17 passes through the dust discharging chute 9 to the dust discharging hopper 1.
The dust discharged from 6 is received by this conveyor 17 and loaded onto a dump truck 18.

FIG. 4 shows an example in which sand or unsintered dust 22 is placed in advance in the lower part of the dust receiver 7 to prevent dust from sticking inside the dust receiver 7, thereby facilitating the initial work of cutting out the dust. It shows.

In the dust discharge device for arc furnace equipment configured as shown in FIGS. 1 to 3, when the operation of the combustion tube 1 is stopped, the movable cart 10 carrying the empty dust receiver 7 is moved onto the elevating rail 11. located at
The dust receiver 7 is attached to the lower part of the combustion tube 1 by raising it using the lifting jack 13. At this time, for safety, the upper flange of the dust receiver 7 and the lower flange of the combustion tube 1 are fastened with bolts and nuts, or locked with a clamp or the like. When the combustion tube 1 is operated, the exhaust gas containing dust from the arc furnace is introduced into the combustion tube 1 from the dust collection duct 2 as shown by the dotted arrow 23 in FIG. The combustible material burns, the dust falls and is received in the dust receiver 7 as indicated by the dotted arrow 24, and the gas exits from the gas outlet duct 3 as indicated by the dotted arrow 25. Thereafter, at an appropriate time, the operation of the combustion tube 1 is temporarily stopped, the dust receiver 7 containing the dust is separated from the lower end of the combustion tube 1, and the lifting jack 13 is lowered to remove the dust receiver together with the movable cart 10. The container 7 is lowered, the movable trolley 10 is moved laterally (moved to the right in FIG. 1) by itself, and replaced with an empty dust receiver 7 that was waiting separately. Repeat this action.
The dust receiver 7 containing dust is transported to the dust discharge position 20 shown in FIG.
As shown in the figure, the dust discharge valve 8 is opened, and the dust in the dust receiver 7 is transferred from the dust discharge chute 9 to the dust discharge conveyor 17 via the dust discharge hopper 16, and is loaded into a dump truck 18.

In the above embodiment, a case has been described in which the dust receiver 7 is placed on the movable cart 10, raised and lowered by the lifting jack 13, and transported to the dust discharge position 20 by the self-propelled movement of the movable cart 10. , when the dust receiver 7 is placed on a forklift. That is, since the forklift has a lifting device and a self-propelled device, the mobile cart 10,
The lifting jack 13, fixed rail 14, etc. can be omitted. Yet another example is a case where the cart 10 is transported to the dust discharge position 20 by a crane. That is, if a crane is used as the transport means, the fixed rail 14 can be omitted.

Effects of the Invention The present invention includes a dust receiver that is removably installed at the lower end of a combustion tube and receives dust falling from the combustion tube, and a moving device that moves the dust receiver up and down and horizontally. This eliminates the need for a worker to enter the combustion tube and input the heavy labor required to discharge dust from the combustion tube, resulting in labor savings.
Moreover, since the dust receiver can be replaced using a cartridge method, the replacement can be done in a short time, so that the temperature drop in the combustion cylinder can be kept to a minimum, and the heat source can be used effectively.
In addition, since a dust discharge valve is provided at the bottom of the dust receiver, the dust discharge valve only needs to be opened at the dust discharge position. It is safe because it will not fall accidentally from the dust receiver.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the present invention, with Figure 1 being a front view, Figure 2 being a plan view of an example of installing fixed rails, and Figure 3 being a side view at the dust discharge position. , FIG. 4 is a side view of one means for facilitating dust discharge, and FIG. 5 is a front view showing an example of the prior art. DESCRIPTION OF SYMBOLS 1... Combustion tube, 7... Dust receiver, 8... Dust discharge valve, 10... Moving trolley, 11... Lifting rail, 13... Lifting jack, 14... Fixed rail.

Claims (1)

[Claims] 1 A combustion tube that introduces dust-containing exhaust gas from an arc furnace and burns combustible substances in the gas, and a combustion tube that is removably installed at the lower end of the combustion tube and that receives dust falling from the combustion tube. 1. A dust discharge device for arc furnace equipment, comprising a dust receiver, a dust discharge valve provided at a lower part of the dust receiver, and a moving device for raising, lowering, and traversing the dust receiver.