KR101461535B1 - Apparatus for improving heating capacity and thermal efficiency in reheating furnace and method thereof - Google Patents

Abstract

The present invention relates to an apparatus and method for improving heating capability and thermal efficiency in a rolling furnace, and more particularly, to an apparatus and a method for improving heating capability and thermal efficiency in a rolling furnace, comprising: a loading zone provided at a charging side of a heating furnace; A loading / unloading unit for loading / unloading the loading zone into the loading zone, A pusher fixed to a side wall of the charging zone and disposed at the same height as the fixed skid beam in the heating furnace; A driving source which is fixed to the bogie and elevates the mounting plate to the position of the pusher; A housing fixed to the upper surface of the mounting plate and opened at both sides in the direction in which the pusher is installed and the other surface being in a hermetically sealed state; And a gap holding member for holding the heating materials stacked in the housing up and down in the vertical direction.

According to the present invention, it is possible to obtain an effect of extending the length of the furnace for improving the heating capacity of the furnace in accordance with the number and width of the heating material and also to lower the temperature of the exhaust gas discharged to the outside of the furnace, It is possible to reduce the cost of the unit fuel, and it is possible to obtain the effect of contributing to the improvement of productivity.

Heating furnace, ash time, heating material, multi-stage stacking, multiple sheets, heating capacity, flue gas

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and a method for improving heating capability and thermal efficiency in a rolling furnace,

More particularly, the present invention relates to an apparatus and a method for improving heating capacity and thermal efficiency in a rolling furnace, and more particularly, A device for improving heating capacity and thermal efficiency in an improved rolling furnace so as to shorten the furnace furnace time to a furnace and to reduce the fuel cost by lowering the flue gas discharge temperature of the furnace, It is about the method.

Generally, a heating furnace adopts a pusher type or a working beam type (WALKING BEAM TYPE) to increase the production amount and uniformity of the heating temperature. In order to ensure the ease of rolling, a heating material The requirements are to ensure uniform heating, ensuring the heating temperature and good flatness.

That is, in order to roll the material, the material must be preheated to a temperature suitable for rolling. For this, the material is preheated through the heating furnace before rolling.

In this case, when the material is heated in the heating furnace, the heating material is charged into the heating furnace one by one, and the charged heating material is heated by the transfer device installed in the heating furnace, .

In this case, as described above, there is a pusher type and a walking beam type as described above. In the case of the pusher type, as shown in FIG. 1A, the heated material W is stitched together to form one heated material W The heating material W in the heating furnace moves simultaneously from the charging side to the extracting side in accordance with the pushing operation of the pusher 10. In the case of the working beam type, (W), and moves the working beam 20 one by one as it moves upward, downward, leftward and rightward.

However, these methods can be regarded as the same heating method in terms of the fact that one piece of heating material is placed consecutively in the longitudinal direction of the heating furnace only in the method of conveying.

The reason why the heating material is placed one by one in the longitudinal direction of the heating furnace is that the structure of the heating device which heats the material inside the heating furnace is impossible when the heating material is fed by more than one structure, If the two heating materials are placed in the upper and lower portions in the longitudinal direction of the heating furnace, the arrangement and structure of the heating apparatus installed in the heating furnace must be changed, This is because the configuration of the heating material conveying device, which is an obstacle factor, must be changed.

Therefore, conventionally, in order to improve the heating ability of the heating furnace (the throughput of the heating material per unit time), a method of increasing the heating temperature added to the heating furnace to increase the heat flux added to the heating material per unit time and thereby shortening the heating time .

However, as shown in Fig. 2, the increase in the heating temperature increases the heat load of the heating zone, deteriorating the refractory, the structure, and the like in the corresponding zone, The temperature of the exhaust gas discharged through the heating furnace 30 also rises, resulting in breakage of the heat exchanger 34 for regeneration, violation of the regulation value of the atmospheric release temperature by the industry, and rapid increase of the fuel consumption level of the heating furnace 30.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems in the prior art, and an object of the present invention is to provide a heating furnace, The present invention provides a device and a method for improving the heating capacity and thermal efficiency in a rolling furnace capable of increasing productivity by reducing the fuel consumption level by lowering the exhaust gas temperature of the furnace at the same time, .

In order to achieve the above object, according to the present invention, there is provided a refrigerator comprising: a loading zone provided on a charging side of a heating furnace and having a sliding door; A loading / unloading unit for loading / unloading the loading zone into the loading zone, A pusher fixed to a side wall of the charging zone and disposed at the same height as the fixed skid beam in the heating furnace; A driving source which is fixed to the bogie and elevates the mounting plate to the position of the pusher; A housing fixed to the upper surface of the mounting plate and opened at both sides in the direction in which the pusher is installed and the other surface being in a hermetically sealed state; And a spacing member for spacing the heating materials stacked in the housing up and down in the vertical direction. The apparatus for improving heating capability and thermal efficiency in a rolling furnace is provided.

At this time, the sliding doors provided in the loading zones are all provided on both sides of the loading zone.

In addition, the bogie is also provided so as to be movable along a guide rail installed on a floor surface through the loading zone.

In addition, the driving source may include an up-down motor fixed to the bogie, a screw shaft connected to the rotating shaft of the up-down motor, and a screw bracket fixed to one side surface of the mounting plate and engaged with the screw shaft There are features.

In addition, the up-down motor is further provided with an encoder for detecting the number of revolutions of the up-down motor and adjusting the height of the bottom plate.

Furthermore, the driving source is also characterized by an operating cylinder fixed to the bogie, and a cylinder rod connected to the operating cylinder and having a stroke reaching the height of the pusher, and connected to and fixed to one side of the mounting plate.

The operating cylinder is also characterized by being a hydraulic or pneumatic cylinder.

Further, the housing is also in the form of a tray opened in both directions in which the pusher enters.

In addition, the housing is also a door type which is opened in both directions in which the pusher enters and is provided with a door that can be opened and closed on the upper surface thereof.

The gap holding member is also fixed to the inner side walls of the housing at regular intervals.

In addition, the support bar is also in the form of a support bar in the form of a single product, which is interposed each time the heating material is placed on the table.

According to another aspect of the present invention, there is provided an apparatus for heating a rolling target, comprising: a heating unit for heating a rolling target in a housing mounted on a fixed plate of a bogie according to a rolling schedule, A stacking step of stacking; A bogie moving step of closing the loading zone by closing the sliding door of the loading zone by moving the bogie into the loading zone when a plurality of the heating materials are stacked on the bogie through the stacking step; A heating step of moving the heated material from the uppermost heating material on the stacking plate to the inside of the heating furnace by using a pusher and raising the stacking plate to wait for the next heating material to be charged; And a moving and extracting step in which the heating material charged through the charging step is heated while moving toward the high temperature side in the heating furnace along the moving skid beam and is extracted through the extraction side after completion of heating, The present invention provides a method for improving heating capability and thermal efficiency in a furnace.

According to the present invention, it is possible to obtain an effect of extending the length of the furnace for improving the heating capacity of the furnace in accordance with the number and width of the heating material and also to lower the temperature of the exhaust gas discharged to the outside of the furnace, It is possible to reduce the cost of the unit fuel, and it is possible to obtain the effect of contributing to the improvement of productivity.

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

Figure 4 is a conceptual top view of the device according to the invention, Figure 5 is a conceptual front view of the device according to the invention, 6 is a perspective view showing the main part of the carriage shown in Fig. 6, Fig. 8 is a view showing the state of use of the apparatus according to the present invention, Fig. 9 is a view FIG. 10 is a flow chart for explaining the method according to the present invention. FIG.

As shown in FIG. 3, in order to implement the apparatus and method according to the present invention, the heat dissipation history, that is, thermal diffusivity occurring in the present heating furnace is measured and tabulated.

First of all, the present invention is characterized in that a uniform heating temperature is secured at the time of extracting a heated material by using the characteristic of the existing heating furnace, that is, the upper and lower heating apparatuses of the heating material, and the heating capacity The amount of fuel used can be reduced by reducing the exhaust gas discharge temperature of the furnace.

As shown in the table of FIG. 3, it has been confirmed that the heat loss of the exhaust gas discharged to the exhaust gas is about 32.6% on the average and about 30 to 37% in the majority of the heat furnaces. This is conceived based on the fact that it is very effective in reducing the fuel cost of the furnace.

In addition, by increasing the charging amount of the heating material for the heating furnace of the same size to increase the charging temperature of the entire heating material, the target temperature increase amount of the heating material is reduced and the furnace time of the heating material in the heating furnace is reduced, .

More specifically, the present invention is characterized in that the heating material to be charged on the entry side is not charged in units of one, but the heating materials of one unit are stacked on each other and piled up to the height of the skid beam, And the heating material is heated by using the atmospheric temperature at the side of the heating furnace, thereby realizing the requirement that the charging temperature is raised.

In addition, the stacked heating material is conveyed to a skid beam as a heating means and a conveying means by a pusher installed on the charging side of the existing heating furnace, The material is conveyed and heated together.

4 to 8, the apparatus according to the present invention is provided with a charging zone 200 on the charging side of the heating furnace 100, and sliding doors (not shown) are provided on both sides of the charging zone 200 210 are installed so that the bogie 300 on which approximately 10 to 15 pieces of the heating material W are stacked can be freely moved.

The heating material W is heated by the pusher 200 in the waiting state while a plurality of sheets are stacked in the loading zone 200 one by one from the carriage 300 by a fixed skid beam 110 and then moved by the moving skid beam 120 to be heated.

8, the sliding door 210 is installed on both sides of the loading zone 200. Therefore, when the bogie 300 is in the state in which the heating material W is placed in the loading state, It is possible to simultaneously perform the work of stacking the workpieces, thereby shortening the working time.

In this case, a guide rail (not shown) may be installed on the bottom surface of the loading zone 200 to improve the convenience of operation and ensure the safety of the operation, and the carriage 300 may be moved along the guide rail It may be installed as much as possible.

A fixed wall 230 is installed at one side of the loading zone 200 and a pusher 220 is installed at an upper portion of the fixed wall 230 or at a height corresponding to the fixed skid beam 110.

The pusher 220 is a means for pushing the heating materials W one by one as described above.

In addition, a plurality of casters (not shown) may be installed on the bottom surface of the carriage 300 drawn into the loading zone 200. If the guide rail is installed, the carriage 300 may be mounted on the guide rail, And is movably installed.

6 and 7, a mounting plate 310 made of refractory material capable of withstanding high temperatures is provided on the upper surface of the carriage 300. A housing 400 is mounted on the upper surface of the mounting plate 310, .

The mounting plate 310 is installed so as to be movable up and down along the fixing wall 230. The means for moving the fixing wall 230 up and down may be an up-down motor 320, (Not shown) having a predetermined stroke, all of which are fixed on the carriage 300.

7, the screw shaft 322 is connected to the rotation shaft of the up-down motor 320, and the screw shaft 322 is connected to the screw shaft 322 through a screw The screw bracket 312 is fixed to one side of the mount plate 310 so that the screw shaft 322 is rotated by the rotation of the up / down motor 320, The screw bracket 312 is rotated but is constrained to the fixing wall 230 so that the mounting plate 310 is not rotated so that the mounting plate 310 is rotated by the screw shaft 322 So that the heated material W accumulated on the upper surface thereof can be raised and lowered to the height of the pusher 220.

In this case, an encoder is installed in the ascending / descending motor 320 so that the stacking plate 310 can be lifted up by a correct height by checking the number of rotations, After completion, the stacking plate 310 is returned to the initial position so that the subsequent objects can be stacked.

When a working cylinder (not shown) is used, a part of the cylinder rod is fixed to the mounting plate 310, and the stroke of the operating cylinder reaches the pusher 220, 310). In this case, since the thickness information of the heated material W can be known, the feed and pneumatic pressures are adjusted according to the number of steps, As shown in Fig.

In addition, the housing 400 preferably has a box shape with the pusher 220 side and the opposite side thereof opened and the other side with a closed shape, and more preferably a multi-stage tray shape.

In this case, it is preferable that a support bar 410 is provided in the housing 400 to maintain a space between the heating materials W. This is because the space between the heating materials W, So as to have a thermal effect.

In addition, a door is formed on the upper portion of the housing 400, and the door is opened only when the heating material W is placed, and the rest is closed so that the heating action is sufficiently performed until the heating furnace 100 is loaded It is more preferable to reduce the heat consumption required for reheating in the heating furnace 100.

The support bar 410 is used for maintaining the gap. When the housing 400 has a tray shape and the heating material W is inserted from the front to the rear, the support bar 410 is inserted into the housing 400 may be preferably fixed to the inner surface of the heating material W. When the heating material W is mounted by opening the upper surface door, The supporting bar 410 may be interposed.

In summary, the heating material W according to the present invention is packed in units of about 10 to 15 units instead of one unit, and is charged using the cart 300 of the side of the heating furnace 100, When the heating material W deposited on the left side is moved to the heating furnace charging zone 200 so that it can be charged from both sides of the heating furnace 100, the conventional furnace 300 is moved to the right, The heating material W is gradually moved in order in the heating furnace 100 in units of one sheet.

At this time, since the heated material W charged in the uppermost stage of the charging zone 200 is first transferred to the inside of the heating furnace 100, the rolling schedule associated with the heating furnace 100 is considered It is preferable to be charged.

A charging method according to the present invention having such a configuration is as follows.

As shown in Fig. 10, first, a step S100 of sequentially stacking the heating material W on the carriage 300 is performed.

In the stacking step S100, the heating material W must be stacked in order according to the rolling schedule. At this time, if the heating material W is in contact with the materials, So that the mutual space between the heating materials W can be ensured in order to increase the heat accumulation effect. In order to secure the mutual space between the heating materials W, Is secured.

In addition, when the heating material W is mounted on the housing 400 of the carriage 300, a tray-type housing is used or a door-shaped housing is used so that heat loss generated when the heating material W is mounted can be minimized More preferable.

After the completion of the stacking, the bogie moving step S110 for moving the bogie 300 to the loading zone 200 is performed.

The bogie moving step S110 may be a method of pushing the bogie 300 by a mechanical means using a castor provided on the bottom surface of the bogie 300 or moving the bogie 300 along a guide rail The guide rail system is preferable.

At this time, when the bogie 300 moves to the charging zone 200, the sliding door 210 provided in the charging zone 200 is opened or closed to prevent the heat material W transferred to the charging zone 200 from being heat- Zoom is particularly preferred.

This is because it is not necessary to heat the heating furnace 100 to a high heat quantity as in the conventional method for increasing the heat quantity of the heating material placed in the charging zone 200 under the condition of the present invention which is very important, It is possible to lower the heat radiation temperature of the discharged exhaust gas.

Then, a charging step (S120) for charging the heating material (W) into the heating furnace (100) is performed by the pusher (220).

The loading step S120 is a step of loading the heating material W having been stacked in the stacking plate 310 in the housing 400 of the carriage 300 by the pusher 220 one by one in a fixed skid beam (110), and moves into the heating furnace (100) one by one according to the operation schedule of the heating furnace (100).

Next, a moving step (S130) is performed in which the heated material W is moved to the high temperature side in the heating furnace 100 by the moving skid beam 120, and heated to a temperature suitable for rolling through this step.

Finally, the heated heating material W is subjected to the extraction step S140 through the extraction side of the heating furnace 100, and is placed in the rolling standby state.

Then, when the heating material W on the carriage 300 is completely charged, the sliding door on the opposite side is opened, the empty carriage is released, and a new carriage on which the heating material W is placed is re- After the wafer W is transferred to the charging zone 200, the above process is repeated to continuously charge the heating material W.

As described above, according to the present invention, the heating material (W) waiting for charging is sufficiently heated in the heating standby time by using its own temperature to prevent the temperature from lowering, thereby reducing the residence time in the heating furnace, So that it is possible to reduce the heat loss due to the emission of the exhaust gas as well as the fuel cost reduction as much as possible.

As shown in the graph of FIG. 9, it was confirmed that when the temperature of the heated material W was raised by 80 ° C through the application of the present invention, the ash time of the heated material W could be shortened by 11 minutes. It was confirmed that the heating performance improvement effect of about 7% (11 minutes / 160 minutes) compared with the conventional time was obtained.

Figs. 1A and 1B are views showing an example of charging and transporting a heating material in a heating furnace according to the prior art,

Figure 2 is an exemplary internal structure of a heating furnace according to the prior art,

FIG. 3 is a table showing the results of thermal analysis of an existing heating furnace for implementing the apparatus and method according to the present invention,

4 is a conceptual top view of the device according to the invention,

Figure 5 is a conceptual front view of a device according to the invention,

6 is a block diagram of a device according to the present invention,

FIG. 7 is an exemplary perspective view showing a configuration of a substantial part of the carriage shown in FIG. 6;

8 is a view showing the use state of the apparatus according to the present invention,

9 is a graph showing the heating history of the heating material according to the present invention,

10 is a flow chart illustrating a method according to the present invention.

DESCRIPTION OF REFERENCE NUMERALS

100 .... heating furnace 110 .... fixed skid beam

120 .... moving skid beam 200 .... loading zone

210 .... sliding door 220 .... pusher

300 .... Balance 310 .... Mounted plate

400 .... housing 410 .... support bar

Claims (12)

A loading zone provided on a loading side of the heating furnace and having a sliding door and sealed; A loading / unloading unit for loading / unloading the loading zone into the loading zone, A pusher fixed to a side wall of the charging zone and disposed at the same height as the fixed skid beam in the heating furnace; A driving source which is fixed to the bogie and elevates the mounting plate to the position of the pusher; A housing fixed to the upper surface of the mounting plate and opened at both sides in the direction in which the pusher is installed and the other surface being in a hermetically sealed state; And a gap holding member for holding the heating materials stacked in the housing in a vertical direction with respect to each other. The method of claim 1, further comprising: Wherein the sliding doors provided in the charging zones are all installed on both sides of the charging zone. The method of claim 1, further comprising: Wherein the bogie is installed to be movable along a guide rail installed on a floor surface through the charging zone. The method of claim 1, further comprising: Wherein the driving source comprises a rising / falling motor fixed to the truck, a screw shaft connected to a rotating shaft of the elevating / lowering motor, and a screw bracket fixed to one side of the mounting plate and engaged with the screw shaft. A device for improving heating capacity and thermal efficiency in a furnace. 5. The method of claim 4, Wherein the up / down motor is further provided with an encoder for detecting the number of revolutions of the elevating / lowering motor and adjusting the height of the stacking plate. The method of claim 1, further comprising: Characterized in that the driving source comprises an operating cylinder fixed to the bogie and a cylinder rod connected to the operating cylinder and having a stroke reaching the height of the pusher and connected and fixed to one side of the stacking plate Apparatus for improving capacity and thermal efficiency. The method of claim 6, further comprising: Wherein the operating cylinder is a hydraulic or pneumatic cylinder. 2. The rolling furnace according to claim 1, wherein the operating cylinder is a hydraulic or pneumatic cylinder. The method of claim 1, further comprising: Wherein the housing is in the form of a tray opened in both directions in which the pusher enters. The method of claim 1, further comprising: Wherein the housing is a door type which is open in both directions in which the pusher enters and which is provided with a door that can be opened and closed on an upper surface thereof. The method of claim 1, further comprising: Wherein the gap holding member is fixed to both inner side walls of the housing at regular intervals. The method of claim 1, further comprising: Wherein the heating bar is a single support bar in the form of a single piece interposed between heating materials. A step of stacking the heating materials to be rolled in a housing provided on a rack plate of a bogie according to a rolling schedule, A bogie moving step of closing the loading zone by closing the sliding door of the loading zone by moving the bogie into the loading zone when a plurality of the heating materials are stacked on the bogie through the stacking step; A heating step of moving the heated material from the uppermost heating material on the stacking plate to the inside of the heating furnace by using a pusher and raising the stacking plate to wait for the next heating material to be charged; And a moving and extracting step in which the heating material charged through the charging step is heated while moving toward the high temperature side in the heating furnace along the moving skid beam and is extracted through the extraction side after completion of heating, A method for improving heating capability and thermal efficiency in a furnace.

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