JPH0317228A - Continuous fluidized bed type heating furnace - Google Patents

Abstract

PURPOSE:To efficiently heat materials to be heated and to prevent the generation of skid marks by providing means tor sending the exhaust gas used in the fluidized bed heating furnace to an adjacent preheating furnace and changing the positions of the materials to be heated in this heating furnace. CONSTITUTION:The preheating furnace 1 is installed adjacently via a heat insulating wall 9 to the wall surface on one side of the fluidized bed heating furnace 2 and the materials 5 to be heated are continuously charged from the preheating furnace 1 via a ventilation hole 10 into the heating furnace 2. The materials 5 are successively transported in a direction E by stationary walking beams 6A and movable walking beams 6B in the beating furnace 2 and are subjected to the heating treatment by burners 42 provided at several points. The hot gas of the heating furnace 2 flows in a direction H at this time and enters the preheating furnace 1 via the ventilation hole 10 to preheat the materials 5. A pusher 33 is provided, via an insertion hole 22, on the side wall surface 21 of the heating furnace 2, which surface faces the side wall surface 9 adjacent to the preheating furnace 1 so that the materials 5 can be changed in position by slightly pushing the material in a direction P. The thermal efficiency is improved in this way and the generation of the skid marks in the materials 5 is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can heat-treat materials made of steel or other metal materials continuously and thermally efficiently. Concerning continuous fluidized bed heating furnace. [Prior art] Conventionally, a fluidized bed heating furnace equipped with a walking beam. As shown in FIGS. 4 and 5, the insulation wall 9. A fuel supply pipe 8, a fluidized bed heating device 7 to which the fuel supply pipe 8 is connected. A device comprising walking beams 6A and 6B installed in parallel with the fluidized bed heating device 7 is known. The fuel supply pipe 8 is arranged below the fluidized bed heating device 7, and the fluidized bed heating device 7 is arranged along the conveyance direction of the material to be heated 5. Further, a plurality of fuel supply pipes 8 are arranged in parallel along the longitudinal direction of the furnace. Also. The walking beams 6A, 6B are installed along with the fluidized bed heating device 7 along the conveyance direction of the material to be heated 5.

Therefore, in the fluidized bed heating furnace 5, the material to be heated 5 is connected to the walking beam 6A. , 6B due to the operation of the movable beam 6B. Transported. Furthermore, fuel gas is supplied to the fluidized bed heating device 7 via the fuel supply pipe 8. Then, the material to be heated 5 is heated on the walking beam 6 by the combustion heat of the fuel gas, and heat treatment such as heating or annealing is performed.

[Problems to be solved] However. The above conventional heating furnace has the following 7 problems. That is, in the above furnace. The heating material 5 is heated by the radiant heat from the fluidized bed heating device 7 due to gas combustion and the reflected heat of the radiant heat from the heat insulating wall 9. Therefore. Heated material 5
is heated directly from the surroundings by the radiant heat, except for the portion that is in contact with the upper surface 6l of the walking beam 6 (FIG. 6). However, since the radiant heat does not directly hit the lower surface 5l of the heated material 5 that is in contact with the walking beam 6, it is not heated strongly. As a result, this lower surface 5l.
As shown in Figure 6, heating unevenness called skid marks 55 occurs, reducing the commercial value of the heated material. Also. In the above conventional furnace, the exhaust gas is
Released from l. The energy of exhaust gas is not fully utilized.

The present invention has been made in view of such conventional logic points. A continuous Vt? that eliminates skin marks on the heated material 5 and allows continuous and efficient heat treatment of the heated material 5. This project aims to provide a JL fluidized bed heating furnace. (Means for solving the problem) The present invention is as follows. Preheating furnace. A heating furnace consisting of a fluidized bed heating furnace equipped with a walking beam, the preheating furnace and the fluidized bed heating furnace are adjacent to each other with at least one side wall surface in contact with each other, and in both furnaces, the material to be heated is transported. As well as sending a stream of hot gas in the opposite direction. The hot gas sent into the preheating furnace is the exhaust gas used in the fluidized bed heating furnace. This continuous fluidized bed heating furnace is characterized by being equipped with a position changing device. In the present invention. The above preheating furnace is. iJ! L Before inserting the material to be heated into the moving bed heating furnace. This is a furnace for preheating the material to be heated to a constant temperature.

Also. The walking beam mentioned above is a moving beam that is driven up and down by, for example, an eccentric cam. This is a device for intermittently moving the object to be heated on the fixed beams arranged alternately (see Figure 2). In addition, the fluidized bed heating furnace mentioned above. Fuel supply pipe. It consists of an ia bed heating section to which the fuel supply pipes are connected and surrounded by a heat insulating wall, and the above-mentioned walking beams arranged in parallel in the conveyance direction of the material to be heated along the fluidized bed heating section. The furnace is a heat treatment furnace for heating or annealing the material to be heated. Also. What does the above-mentioned at least one side wall mean? At one side wall of the preheating furnace and the fluidized bed heating furnace, that is, at least one side wall surface. It means part or all of it. Also. The above heated material is steel. There are billets, blooms, slab pipes, rods, etc. made of other metal materials. Also, what is the above position conversion device? This is a device for changing the position of the bottom surface of the heated material that comes into contact with the top surface of the walking beam. For example, These include a puncher for moving the material to be heated in its longitudinal direction on the walking beam, a rotating device for giving a certain degree of rotation (for example, 90 degrees) to the material to be heated, and the like.

[Action and effect]

In the heating furnace according to the present invention, the preheating furnace and the fluidized bed heating furnace are adjacent to each other so as to be in contact with each other on at least one side wall surface. Therefore, the area where heat is lost during heat radiation from the insulated walls of both furnaces can be reduced. Therefore, the wood heat treatment furnace can reduce heat loss and produce energy-saving products.

Also. In both of the above furnaces. ): U Because the hot gas flows in the direction opposite to the direction in which the heated material is transported. Excellent thermal efficiency in heat treatment. Furthermore, the hot gas for heat treatment sent to the preheating furnace is the exhaust gas used in the fluidized bed heating furnace.

Therefore, thermal efficiency is further improved. Energy saving can be further achieved.

Also. In the above-mentioned fluidized bed heating furnace, since a position changing device is installed, the surface of the material to be heated that comes into contact with the walking beam is changed, and no skid marks occur. therefore. According to the present invention, the material to be heated can be heat-treated continuously and thermally efficiently. A continuous fluidized bed heating furnace can be provided. [Example] A heating furnace according to an example of the present invention will be explained using FIGS. 1 to 3. That is, the heating furnaces of the two examples are as shown in Figures 1 and 2. It consists of a preheating furnace 1 and a fluidized bed heating furnace 2 equipped with a walking beam 6A6B. and. The preheating furnace 1 and the fluidized bed heating furnace 2 are adjacent to each other in a state in which a portion of one side wall surface in the longitudinal direction of the fluidized bed heating furnace 2 is in contact with the l side wall surface of the preheating furnace I. In addition, in the fluidized bed heating furnace 2,
The hot gas 41 is directed in the direction H opposite to the conveying direction E of the material to be heated 5.
Burners 42 are installed at several locations to send the water. Also,
The burner 42 is supplied with a fuel gas 40 (a mixed gas of air K1 and natural gas G). Further, in the preheating furnace 1, a ventilation hole IO is provided on the 1 side wall surface of the heat insulating wall 9 adjacent to the fluidized bed heating furnace 2. The ventilation hole 10 is. This is for feeding the exhaust gas used in the fluidized bed heating furnace 2. In addition, the ventilation hole 10 has 5
It also serves as a passage for continuously conveying the material to be heated 5 from the preheating furnace 1 to the fluidized bed heating furnace 2.

Further, the preheating furnace 1 is provided with a busher 3l and its insertion hole 11 for feeding the material to be heated 5 into the fluidized bed heating furnace 2 on the side wall surface of the heat insulating wall 9 facing the ventilation hole 10. Further, the preheating furnace 1 is provided with a pusher 32 and its insertion hole 12 near the other end on the same side wall surface where the insertion hole 11 is provided. The insertion hole 12 is for inserting the material to be heated 5 into the preheating furnace 1. In addition, the insertion hole 1
A chimney l5 for discharging the υ1 gas is installed adjacent to the chimney l5. In addition, the fluidized bed heating furnace 2 includes: A bunosher 33 and an insertion hole 2 are provided on the side wall surface 2l facing the side wall surface adjacent to the preheating furnace l.
2 will be provided. The insertion hole 22 is for slightly pushing the heated material 5 as a position changing device in the P direction. Further, the fluidized bed heating furnace 2 is provided with a hole 23 for taking out the material to be heated 5 near the end on the same side wall surface 21 side as the insertion hole 22.

Further, in the fluidized bed heating furnace 2, there is a hole near the end of the side wall surface 25 facing the takeout hole 23. A busher 34 and its insertion hole 24 are provided. The pusher 34 is for taking out the material to be heated after the heat treatment. The fluidized bed heating furnace 2 also includes walking beams 6A and 6B in the hearth, as shown in FIGS. 1 and 2.
and a fluidized bed heating section 71. That is. The walking beam has fixed beams 6A and moving beams 6B arranged alternately along the conveyance direction E of the material to be heated 5. Further, a recess 610 for placing a heated material is provided on the upper surface 61 of the fixed beam 6A and the movable beam 6B. Further, below the walking beams 6A and 6B, a dispersion plate 73 is arranged along the direction in which the material to be heated 5 is fed. Furthermore, a sand seal 72 is provided at a portion where the fluidized bed heating section 7l and the walking beams 6A, 6B are adjacent to each other. That is. At the end of the dispersion plate 73. A seal plate hanging down from the walking beam 6B is fitted into the upright concave groove wall. In addition. In the preheating furnace 1, walking beams 6A and 6B are provided similarly to the fluidized bed heating furnace 2.

Since the heating furnace of this example is constructed as described above, it has the following effects. That is. In the heating furnace of this example, the preheating furnace 1 and the fluidized bed heating furnace 2 are adjacent to each other with one side wall surface in contact with each other, so that the area for heat radiation loss from the heat insulating wall 9 of both furnaces is reduced. Therefore. It is possible to save heat energy.

In addition, in both of the above furnaces, 4 liters of hot gas is flowed in the direction H opposite to the conveying direction E of the material to be heated 5. Excellent thermal efficiency of heating gas. moreover. The exhaust gas sent to the sub-heating furnace I is as follows. For example, about s used in the fluidized bed Ull thermal furnace 2
o o ”c or more.

Therefore, thermal efficiency is further improved and energy savings can be achieved. Furthermore, since the fluidized bed heating furnace 2 is provided with a bunosher 33 as a position changing device, the portion where the material to be heated 5 contacts the upper surface 61 of the walking beam can be changed. Therefore. Skid marks do not occur on the heated material 5. Therefore, according to this example, the material to be heated 5 can be heated continuously and thermally efficiently, and skid marks are not generated. A continuous fluidized bed heating furnace can be provided.

[Brief explanation of the drawing]

1 to 3 show a heating furnace according to an embodiment of the present invention. Figure 1 is a perspective view. Figure 2 is a partially cutaway perspective view of the fluidized bed heating furnace, Figure 3 is a partially enlarged perspective view of the sand seal section,
Figures 4 to 6 show a conventional fluidized bed heating furnace, with Figure 4 being a side sectional view, Figure 5 being a front sectional view, and Figure 6 being an explanatory view of the skid mark shaped bottom. 2... Fluidized bed heating furnace, 31-34... Film shear 40... Fuel gas 4 liters... Hot gas, 42... Burner 5... Material to be heated, 55... Skid Mark 6A 6B...Walking beam 7...Fluidized bed heating section 8...Fuel supply pipe, 9...Insulating wall,

Claims (1)

[Claims] A heating furnace consisting of a preheating furnace and a fluidized bed heating furnace equipped with a walking beam, wherein the preheating furnace and the fluidized bed heating furnace are adjacent to each other in contact with each other on at least one side wall surface,
In both furnaces, a hot gas flow is sent in a direction opposite to the conveying direction of the material to be heated, and the hot gas sent into the preheating furnace is the exhaust gas used in the fluidized bed heating furnace, and the hot gas is the exhaust gas used in the fluidized bed heating furnace. The continuous fluidized bed heating furnace is characterized in that a position changing device for changing the position where the material to be heated comes into contact with the upper surface of the walking beam is provided.