KR20030021625A - Apparatus for connecting dust-collection duct with improved dust-collection efficiency - Google Patents

Abstract

PURPOSE: An apparatus for connecting dust collection duct with improved dust collection efficiency is provided which performs opening and closing of roof of an electric furnace flexibly and suppresses leakage of flue gas and dust due to tilting of the electric furnace at the same time. CONSTITUTION: In an apparatus for connecting a dust collection duct for collecting flue gas and dust exhausted from an electric furnace(1) for manufacturing molten steel, the apparatus for connecting the dust collection duct with improved dust collection efficiency comprises a streamline pickup elbow duct(30) one side of which is penetratingly installed on a roof(6) of the electric furnace(1), and at the other side of which a streamline flange plate having the same radius of curvature as rotational radius of curvature during rotational opening and closing of the roof(6) of the electric furnace(1) is formed; a streamline connecting duct(31) at one side of which a streamline flange plate having the same radius of curvature as a radius of curvature of the streamline flange plate of the streamline pickup elbow duct(30) so that the streamline flange plate is rotated by being contacted with the streamline flange plate of the streamline pickup elbow duct(30) is installed, and at the other side of which an outlet straight line shaped flange plate larger than the outlet flange plate of the funnel flange plate(32) is installed; and a funnel flange duct(32) at an inlet of which an inlet straight line shaped flange plate is formed so that the inlet straight line shaped flange plate is contacted with the outlet straight line shaped flange plate of the streamline connecting duct(31), at which an inlet dust collection pipe is formed in an oval shape larger than diameter of a lateral dust collection pipe of the streamline connecting duct(31), and an outlet of which is extended so that the funnel flange duct(32) is connected to a dust house.

Description

APAPATUS FOR CONNECTING DUST-COLLECTION DUCT WITH IMPROVED DUST-COLLECTION EFFICIENCY}

The present invention relates to a dust collecting duct connection device having improved dust collection efficiency, and more particularly, a flexible opening and closing action of an electric furnace loop, and at the same time suppressing the leakage of exhaust gas and dust due to the tilt of the electric furnace, to increase the dust collecting efficiency. The connection device of the.

Generally, certain other furnaces, including electric furnaces, are equipped with a dust collector. Due to the nature of the furnace that must be tilted during operation, the dust ducts connected to it must be technically designed to increase efficiency.

A process of manufacturing molten steel by melting scrap iron in an electric furnace having a dust collecting duct facility connected by a conventional dust collecting duct connection is as follows.

As shown in FIG. 1, two furnaces 1 and 2 are installed to dissolve in one furnace during operation, and to prepare in another furnace, and to prepare the furnaces 1 and 2. In order to melt the scrap metal in the upper part, an upper electrode bar 3 and a lower electrode 4 are required, and arcing (Arcing) is applied to the scrap metal in the furnace using a current flowing therein to perform a melting operation.

An operation problem essential during the above operation is the most important problem of collecting and collecting the various gases (Gas) and dust (Dust) generated during the dissolution operation most efficiently.

The construction of the dust collecting duct 5 in the electric furnaces 1 and 2 is a pick-up elbow duct that primarily sucks dust flying upwards of the furnace roof 6. 7) is installed, followed by a break flange duct (8) as a connecting duct, connected to another duct (9) at the bottom thereof, and somewhat heavy dust (under the bottom). It is composed of a dust house 10 that collects and processes dust.

FIG. 2A is a plan view of a state in which the roof 6 of the upper part of the furnace 1 is opened in order to finish tapping the molten steel in the furnace after the end of the melting operation in the furnace and load the scrap metal and the raw material, which is the next process. The movement of the equipment to be made before opening (6) is to be carried out by the horizontal flange of the brake flange duct (8).

This is because if the loop 6 swings while the brake flange duct 8 is not moved, the edge of the upper pickup elbow duct 7 and the edge of the brake flange duct 8 interfere with each other to perform work. to be.

In the power transmission method for moving the brake flange duct 8, as shown in FIG. 1, a moving rail 11 is installed on a fixed building structure, and a driving roller 12 is mounted on the upper and lower parts thereof. After joining, a fixed track capable of transverse movement by welding to the body of the brake flange duct 8 is secured, and the driving method is to be moved by the drive motor 13 and the hydraulic cylinder 14.

3 is a view of manufacturing molten steel 16 in the furnace due to the operation characteristics of the electric furnace 1, the outlet of the molten water and slag (Slag) is designed to be different, the front of the de-slag door (De-Slag Door; 18) is located, the hot water outlet 17 is installed on the back. Therefore, the operation is performed while tilting the furnace body 1 in accordance with the intention of the worker during the operation, such a device as a rack (19) and gear (20) in the lower portion of the electric furnace (1) in a constant track It is fixed and is moved by the hydraulic cylinder 15.

At this time, when the exhaust gas and dust 21 generated during the operation first pass through the pickup elbow duct 7 and then pass through the secondaryly installed brake flange duct 8, as described above. The transverse movement can be performed, but the wired movement cannot be performed due to the tilting of the electric furnace 1, so the pipes at the connection part do not coincide, and the exhaust gas and the dust 21 leak 22, which reduces the dust collection efficiency. The state is shown in Fig. 4A as a planar cross-sectional view.

4B is a side view showing the brake flange duct 8 which is tilted when the electric furnace is tilted as described above, and the pickup elbow above the loop 6 of the furnace 1 having two duct structures during operation. It is a view to secure space when the penetrating part of the duct 7 and the penetrating part of the brake flange duct 8 are closed to each other, and according to the angles of the structures of the ducts 7 and 8 moving back and forth during the operation of the electric furnace 1. The space secured area is indicated by a dotted line.

As described above, the electric furnace should always open and close the roof for scrap metal loading and other maintenance work when the dust collecting duct of the prior art is installed.

When the furnace loop is closed, the pickup elbow duct, which is the dust collecting duct on the upper part of the roof, and the dust collecting duct in which the fixed structure is installed should be closely connected to reduce the empty space to minimize dust collection efficiency.

At this time, one of the conventional duct (duct) connection method that is already installed and used is a connection method using a brake flange duct used to connect to a fixed building.

The problem with the application of this method is that productivity is reduced due to less time available for operation due to the time problem of opening and closing of the brake flange duct during operation. Since it is installed around the connected duct, the occurrence rate of failure increases and repair time is long, and a lot of equipment accidents are caused by collision between facilities due to malfunction.

In addition, since the brake flange duct around the hot material is unstable operation is installed in the automation facility, there is a case that the operation is sometimes delayed because it affects the facility operation automation program to be carried out uniformly.

In particular, the biggest problem in the prior art is that the outlet of the molten steel and slag generated in the process of manufacturing molten steel in the furnace due to the characteristics of the operation of the furnace is installed in a different position, the slag outlet is located in front of the bar There is a doorway in the back.

Thus, the operator performs the work while tilting the electric furnace back and forth according to the condition of the yellowing occurring during the operation.

At this time, in the conventional Duct connection method, the pickup elbow duct in the upper part of the furnace roof and the brake flange duct installed on the wall of the building structure are generated in the furnace due to the non-linear relationship. Exhaust gases and high temperature dusts leak to the outside, making the surrounding environment poor, as well as generating flames between open spaces, affecting the life of the surrounding equipment.

In order to solve the problems as described above, the present invention is to smoothly open and close the furnace loop without the left and right movement of the dust collecting funnel duct during the opening and closing action of the furnace loop at the same time to suppress the leakage of exhaust gas and dust due to the tilting of the furnace. In order to provide a connection device of the dust collecting duct is improved by inserting the wire connecting duct to improve the dust collection efficiency.

1 is an overall front view showing a dust collecting duct installation connected by a connection device of a conventional electric dust collecting duct;

2 is a plan view showing a state in which a loop of an electric furnace connected to a dust collecting duct facility connected by a conventional electric dust collecting duct connecting device is rotated and opened;

Figure 3 is a side view showing the left and right tilting state of the electric furnace connected to the dust collecting duct installations connected by the conventional electric dust collecting duct connection device;

4A is a plan view showing a state in which exhaust gas and dust are leaked during left and right tilting of an electric furnace connected to a dust collecting duct facility connected by a conventional electric dust collecting duct connection device;

Figure 4b is a trajectory diagram showing a state in which the connection device is tilted when the left and right tilting of the electric furnace connected to the dust collecting duct equipment connected by the conventional electric dust collecting duct connection device;

Figure 5a is an enlarged front view showing the configuration of the connection device of the dust collecting duct improved in accordance with the present invention;

Figure 5b is a plan view and a partial cutaway showing the configuration of the connection device of the dust collecting duct improved in accordance with the present invention;

6 is an overall front view showing a state in which the connecting device of the dust collecting duct with improved dust collection efficiency according to the present invention is connected to an electric furnace;

7 is a plan view showing an operating state during the rotational opening of the loop of the electric furnace connected to the connection device of the dust collecting duct with improved dust collection efficiency according to the present invention;

8 is a planar cross-sectional view showing a state in which the connecting device is tilted left and right when the left and right tilting of the electric furnace connected to the connecting device of the dust collecting duct improved in accordance with the present invention.

♣ Explanation of symbols for main part of drawing ♣

1: Electric furnace 10: Dust house 30: Wired pick-up elbow duct

34: Wire flange plate 32: Funnel flange duct 35: Straight flange plate

31: Wired connecting duct

In order to achieve the above object, the present invention is installed on one side is penetrated with the furnace loop (Roof), the other side is a streamline formed of a streamlined flange having a radius of curvature equal to the radius of curvature at the time of rotation opening and closing of the furnace loop A pickup elbow duct;

A streamlined flange formed on one side with a radius of curvature equal to the radius of curvature of the streamlined flange of the streamlined pick-up elbow duct such that the streamlined flange of the streamlined pick-up elbow duct contacts and rotates is larger than the inlet flange of the dust collecting funnel duct to be described later. A wired connecting duct having a formed exit straight flange plate;

While forming the inlet flange to contact the outgoing straight flange plate of the wired connecting duct to form an inlet dust collector diameter with an elliptical shape larger than the lateral dust collector diameter of the wired connecting duct, the outlet side is expanded and composed of a dust collecting funnel duct connected to the dust house It provides a connection device of the dust collecting duct is improved dust collection efficiency.

In addition, the present invention provides a connection device of the dust collection efficiency improved dust collection duct, characterized in that the wired connecting duct is configured to include a water cooling line installed on the outer peripheral surface for the cooling of the duct,

The present invention provides a connection device of the dust collecting efficiency of the dust collecting efficiency is improved, characterized in that the wired connecting duct is supported by a support fixed to the outer wall of the electric furnace.

On the other hand, the present invention is a connection device of the dust collecting duct is improved dust collection efficiency, characterized in that formed in a parallelogram shape so that the exit straight flange plate of the wire connecting duct and the entry straight flange of the dust collecting funnel duct in contact with each other. Will be provided.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated in detail based on attached drawing.

Figure 5a is an enlarged front view showing the configuration of the dust collecting efficiency of the dust collecting duct connection according to the present invention, Figure 5b is a plan view and a partial cutaway showing the configuration of the dust collecting efficiency of the dust collecting duct connection device according to the present invention. .

As shown in FIGS. 5A to 5B, a wired pick up elbow duct 30 having a curve that does not interfere with the opening of the loop 6 is installed above the furnace loop 6.

In the middle, a wired connecting duct 31 capable of moving along the same angle at the time of tilting the furnace body 1 is installed, and a supporting support 33 is installed at the lower portion thereof to the furnace body 1. Weld

In addition, when manufacturing the wired connecting duct 31, the flange (Flange) has an electric wire loop 6 side to the streamline 34, the opposite side is manufactured to maintain the plane 35 flange (Flange) Apply the magnification of the plate part.

In addition, in order to increase the cooling efficiency of this portion, a water cooling pipe 38 is provided. And after the flange portion 37 of the funnel flange duct (32), which is the core component of the present invention as shown in the cross-sectional view of Figure 5b, the next dust collection duct after (Duct; 9) is completed and then fixed to the structure post (Post) 39.

In addition, in order to prevent the discharge of the exhaust gas between the flange (Flange) and the flange (Flange) to minimize the gap (Gap) to align the duct (Duct).

At this time, the technical means that can minimize the collision between the flanges, but also to avoid the collision between the equipment first to open and close the wired pickup elbow duct (30) installed in the furnace loop (6) of the furnace (1) during operation Movement of the wired connecting duct 31 and the funnel flange duct 32 during tilting can be solved by facility characteristics moving along a track on a certain rail.

FIG. 5B is a front sectional view of the wired pick-up elbow duct 30, and FIG. 5B is a front sectional view of the wired connecting duct 31, which is composed of an extended parallelogram flange plate 35 portion.

5B is a front sectional view of the funnel flange duct 32, which has an extended elliptical piping form, and includes a parallelogram flange plate 37. As shown in FIG.

As shown in (D) of FIG. 5B, the space of the duct which is collected as described above and collected in spite of the stagger of the wired connecting duct 31 and the funnel flange duct 32 during constant tilting of the furnace body 1 is shown. The interior is always closed.

Hereinafter, the operation of the present invention will be described in detail with reference to the accompanying drawings.

6 is an overall front view showing a state in which the connection device of the dust collecting duct with improved dust collection efficiency is connected to an electric furnace.

As shown in Figure 6, the dust collecting efficiency of the dust collecting duct connection device according to the present invention is installed wired pickup elbow duct 30 on the upper end of the loop 6 of the pair of electric furnace (1, 2) The wired connecting duct 31 and the funnel flange duct 32 are sequentially positioned. Then, the wired connecting duct 31 is composed of a support 33 fixed to the furnace body 1 to support it, and a pipeline 38 for cooling the duct 31.

Figure 7 is a plan view showing the operating state of the rotation opening of the loop of the electric furnace connected to the connection device of the dust collecting duct with improved dust collection efficiency according to the present invention.

As shown in FIG. 7, the main body of the furnace at the time of opening the loop 6 before the melting operation of the electric furnace 1 to which the wired connecting duct 31 constituting the connection device of the dust collecting efficiency with improved dust collecting efficiency according to the present invention is applied. The wired connecting duct 31 supported by (1) and the wired pick-up elbow 30 on the upper part of the roof 6 are separated without interference, and again when the two loops 6 are closed when the loop 6 is closed. The engagement of (31) works due to the streamlined design of the flange due to the relation of moving a constant circular orbit, while maintaining a virtually appropriate gap and always being in a straight line.

In addition, if the tilt angle as much as the left arrow is maintained due to the need of a worker's furnace tilt during melting of the electric furnace 1, a wired connecting duct installed in the central axis of the funnel flange duct 32 installed in the furnace building structure and the furnace ( 31) Although the central axis does not coincide, it is widely designed at the end of the funnel flange duct 30, and the flange of one part of the wired connecting duct 31 is made wide so that the exhaust gas generated in the electric furnace 1 and When dust is collected, the space inside the duct is prevented from being narrowed and prevented from leaking out to the outside to allow perfect dust collection.

8 is a planar cross-sectional view showing a state in which the connecting device is tilted left and right when the left and right tilting of the electric furnace connected to the connecting device of the dust collecting duct improved in accordance with the present invention.

When the electric furnace is tilted by explaining the tilting operation of the electric furnace based on FIG. 7, as shown in FIG. 8, the wired connecting duct 31 supported by the support 33 fixed to the main body of the electric furnace 1 is shown. Is tilted left and right at the same time as the tilting action of the furnace, the exit flange plate 35 of the wired connecting duct 31 is larger than the inlet flange plate 37 of the funnel flange duct 32 of the same shape to be described later in a parallelogram shape. At the same time, the size of the dust collecting tube of the funnel flange duct 32 which is in contact with it is formed in an elliptical shape that is about twice the size of the dust collecting tube diameter of the wired connecting duct 31 in the transverse direction. 1) can act to dissolve molten metal and transfer the flue gas flow to the dust collector without leaking regardless of the tilt angle of the furnace (1).

As described above, the present invention can shorten the preparation time for the operation of the electric furnace and reduce the equipment life due to the flame generated during operation and the failure rate to improve the productivity, reduce the cost, can be generated a lot of operations Due to the emission of exhaust gas and dust, it is effective to prevent environmental pollution and improve working conditions due to pleasant environmental management.

Claims (4)

In the connecting device of the dust collecting duct (Duct) for collecting the exhaust gas and dust discharged from the electric furnace (1) for manufacturing molten steel, One side of the wired pickup elbow formed through the loop (6) of the electric furnace 1, the other side is formed of a streamlined flange plate 36 having a radius of curvature equal to the radius of curvature of the rotation of the copper furnace loop (6). Duct 30; Streamlined flange plate 34 formed with the same radius of curvature of the streamlined flange plate 36 of the streamlined pick-up elbow duct 30 so that the streamlined flange plate 36 of the streamlined pick-up elbow duct 30 contacts and rotates. A wired connecting duct 31 having an exit straight flange plate 35 formed larger than an entrance flange plate 37 of the funnel flange duct 32 which is provided on one side and which is later described; While forming the entry straight flange plate 37 in contact with the exit straight flange plate 35 of the wired connecting duct 31, the entry dust collecting diameter is formed in an elliptical shape larger than the lateral dust collecting diameter of the wired connecting duct 31, Outlet is connected to the dust collecting efficiency improved dust collection ducts, characterized in that consisting of a funnel flange duct (32) connected to the dust house 10 is extended. The method of claim 1, The wired connecting duct 31 is connected to the dust collection efficiency of the dust collection duct, characterized in that it comprises a pipeline 38 installed on the outer peripheral surface for cooling the duct. The method of claim 1, The wired connecting duct 31 is connected to the dust collecting efficiency of the dust collecting duct, characterized in that supported by the support (33) fixed to the outer wall of the electric furnace (1). The method of claim 1, The dust collector, characterized in that the outgoing straight flange plate 35 of the wired connecting duct 31 and the inlet straight flange plate 37 of the funnel flange duct 32 in contact therewith are formed in a parallelogram shape to face each other. Connection device of dust collecting duct with improved efficiency.