JP2877162B2 - Solid multi-stage furnace - Google Patents

Description

The present invention relates to a vertical multi-stage furnace, and more particularly, to a vertical multi-stage furnace.
In a vertical multi-stage furnace in which a hearth is formed in multiple stages in the furnace and a stirring arm having a large number of stirring teeth is arranged for each hearth, the furnace is heated and held for operation. The present invention relates to an improved structure in which the stirring teeth of each stirring arm can be exchanged from outside the furnace and exchangeable, and can be slid up and down corresponding to the surface of the hearth in the state where the stirring is performed.

[Conventional technology]

For example, for activation treatment of activated carbon, baking treatment of formed coal, or roasting treatment of sulfide ore, a vertical multi-stage furnace is generally used.

As is well known in the art, this type of vertical multi-stage hearth furnace is provided with a multi-stage hearth having an opening at the center in the furnace and rotating through the respective openings at the center. From the rotating shaft that is freely erected, the stirring arms are projected radially in correspondence with the respective hearths, and a number of stirring teeth toward the hearth surface are provided on the lower surface of each of the stirring arms. The raw material granules supplied from the furnace top are mixed and stirred by the respective stirring teeth of the corresponding stirring arms on the surface of the hearth under the heating atmosphere, and are transferred to the upper part. From the hearth to the lower hearth, and the powder is finally discharged from the hearth.

As for the mounting structure of each stirring tooth with respect to the stirring arm, a mounting piece integrated with the upper part of each stirring tooth is sequentially inserted into a slit groove formed on the lower surface of the stirring arm. The arm ends are completely fastened and fixed with bolts and nuts or the like so that the respective stirring teeth do not come off.

[Problems to be solved by the invention]

In the conventional vertical multi-stage furnace configured as described above, for example, when performing the activation treatment of activated carbon, the atmosphere temperature in the furnace is maintained at a high temperature of 1000 ℃ or more, and moreover, Coking coal usually contains sulfur components, etc., and steam for processing is supplied to the furnace, so the furnace is placed in an extremely severe corrosive atmosphere. .

Accordingly, for each of the stirring teeth of the stirring arm operated in such a severe corrosive atmosphere, particularly the lower tooth end of each of the stirring teeth that comes into direct contact with the raw coal to be treated on the hearth, The parts are severely corroded in a short period of time, and the degree of corrosion also tends to progress in a relatively short period of time. As a metal having properties, for example, a material containing nickel is frequently used, so that corrosion in this case is particularly severe. If the effective length of each agitating tooth is shortened due to the progress of the corrosion, the mixing and agitation and transfer of the raw coal to be treated are left unreliable, and a treated product of stable quality cannot be obtained. Therefore, when the corrosion of each stirring tooth has progressed to some extent, it is necessary to replace this with a new stirring tooth.

On the other hand, in this conventional vertical multi-stage floor furnace, as a hanging attachment structure of each stirring tooth to the stirring arm, it is integrated with the upper part of the stirring tooth in a slit groove formed on the lower surface of the stirring arm in the longitudinal direction. After sequentially engaging the attached mounting pieces, the entirety of each of these stirring teeth is applied to the end of the arm and firmly fastened with bolts and nuts, etc.
With such a mounting structure, the replacement and replacement of each stirring tooth cannot be performed while the furnace is operating, and the operation of the furnace itself is temporarily stopped only for the replacement of this stirring tooth. At the same time, after the furnace temperature is lowered to about room temperature, an operator enters the furnace and performs a desired replacement operation.

Thus, in the case of the vertical multi-stage furnace with the conventional configuration,
It is necessary to temporarily stop the operation of the furnace and allow the entire furnace to cool down to room temperature only for the mere replacement of the stirring teeth. In addition to this, it is inevitable that startup takes place at the time of restarting, and it takes a considerable amount of time to stabilize the inside of the furnace to a predetermined high temperature of 1000 ° C or higher. Changing the temperature from a low temperature of about room temperature to a high temperature of 1000 ° C or more, which is the operating temperature, on the other hand, is severely damaged or worn due to expansion and contraction of the refractory bricks that constitute the furnace body. It is no longer enough to repair the joints in between, and it is necessary to partially replace the refractory brick.

Further, when the temperature increase and decrease are repeated in this manner, the hearth of each stage tends to tilt, and the interval between the surface of the hearth and the corresponding stirring arm univocally increases. Of the raw coal is fixedly hung from the lower surface of the steel to a predetermined position (predetermined length), so that the dead space between the stirring teeth and the stirring teeth is increased. As a result, the coking coal remaining layer left on the hearth surface is ashed, resulting in a decrease in the production yield, and with an increase in the load on the hearth, the degree of its inclination becomes more severe, and The entire refractory brick must be replaced.

In addition, the inclination of the hearth as described above may also occur due to the life of the refractory bricks constituting the hearth, and further, the hearth itself may be changed based on the life of the refractory brick. In some cases, such as when the temperature rises due to the rearrangement, the temperature rises excessively or insufficiently.

In other words, the operation is very simple in that the stirring teeth are simply replaced, but there is a problem in that the productivity and the life of the furnace accompanying this are too great.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a large number of stirrers that are suspended and held by a stirrer arm while hot, without stopping furnace operation. The teeth can be replaced arbitrarily,
Up and down sliding adjustment is possible in response to changes in the inclination of the hearth surface, and at the same time, when replacing or replacing, only the highly corrosive tip of each stirring tooth needs to be replaced. It is an object of the present invention to provide a vertical multi-stage furnace of this type which makes effective use of the furnace.

[Means for solving the problem]

In order to achieve the above object, a vertical multi-stage furnace according to the present invention is provided with a multi-stage hearth with a central opening in the furnace body,
And place the work port on the furnace body part corresponding to each hearth,
A rotating shaft was rotatably erected through the center opening of each hearth, and a stirring arm was projected from the rotating shaft in a radial direction corresponding to each hearth, and formed on the lower surface of each stirring arm. In a vertical multistage floor furnace equipped with a number of stirring teeth hanging down toward the hearth surface in the slit groove, a mounting piece is provided on the upper surface of the substrate, and a stopper frame is provided at the upper portion on a slide frame hung down on the lower surface. A stirring assembly is provided in which the stirring teeth are slid up and down and fitted so that positioning can be set.
In a state where the mounting piece of the stirring assembly was removably mounted in the slit groove of the stirring arm, the stirring assembly was fixed by a fixing wedge rod inserted into a mounting hole at the tip of the stirring arm. It is characterized by:

[Action]

That is, in the present invention, while the inside of the furnace is heated, the tip of the stirring arm is positioned so as to face the work port, the rotating shaft is stopped, and the pressure in the furnace is reduced to a slightly negative pressure. The work opening is opened, and in this state, the heat-insulating castable covering the distal end of the stirring arm is crushed and removed, and then a wedge rod for fixing is pulled out from a mounting hole at the distal end of the stirring arm, and a row of the stirring assembly is assembled. Can be taken out of the furnace, thereby easily replacing the stirring tooth to be replaced with a new stirring tooth outside the furnace, and at the same time, easily adjusting the droop length of the new stirring tooth. In the reverse operation, the stirrer assembly replaced with the new stirrer teeth from the tip of the stirrer arm is mounted again, and the stirrer is re-inserted with the wedge rod for fixing. A new stirrer for the arm If the stirrer assembly line replaced with the teeth can be reconfigured, the tip of the stirrer arm can be re-coated with an adiabatic castable to return to the current state, and then the work port is closed to restore the furnace internal pressure to normal You can restart.

〔Example〕

Hereinafter, an embodiment of a vertical multi-stage furnace according to the present invention will be described in detail with reference to FIGS.

FIG. 1 is a cross-sectional view schematically showing an outline of a general vertical multi-stage furnace, and FIGS. 2 (a), (b) and (c) show a furnace top, a furnace wall and a furnace of the same furnace body. FIG. 3 is a schematic cross-sectional view showing a detailed configuration of a bottom portion, and FIG. 3 is a partial perspective view showing an outline of a stirring and transferring section of a raw material to be processed in the same furnace configuration.

In the furnace configuration shown in FIGS. 1 to 3,
The vertical multi-stage furnace has a furnace body 11 having an upright cylindrical shape, and the furnace body 11 is provided with an insulating brick 11c and / or a refractory brick 11 via an insulating castable 11b inside an outer furnace shell 11a made of a steel plate.
d, and supply port 1 for coking coal
2.A furnace 13 with an opening at the center by combining refractory bricks in shelves and laying them on the inner side of the furnace wall, with outlets 13 for treated coking coal formed at the bottom of the furnace. Floors 14 are provided in multiple stages of about 8 to 10 steps, and each of these steps alternately forms a drop port 15 at every other central portion and peripheral portion to communicate vertically. A work port 16 having an opening / closing door 17 is formed for each step. In the drawing, reference numeral 18 denotes a gas discharge port opened at the top, 19 denotes a work deck provided around the outside of the furnace body 11 corresponding to the work port 16, and in a normal case, the furnace Outer diameter of body 11 is about 5-8m, height is 10
It is set to about 15m.

In the center of the furnace body 11, the rotating shaft 21 erected through the opening of each hearth 14 can be driven to rotate by the drive unit 22, and the shaft on the furnace top side. The upper part is sealed by a sand seal 23, and the lower part of the shaft on the furnace bottom side is sealed by a water seal 24. Further, from the rotating shaft 21, about 2 to 4 stirring arms 31 are protruded in a radial direction at each stage corresponding to each of the hearths 14. Stirring arm
In each of 31, the outer peripheral portion is castable 21a,
The cooling blower 25 can be appropriately cooled through the hollow double-structured interior covered with 31a.

A slit groove 33 (to be described in detail later) having a dovetail cross section along the longitudinal direction is formed in the lower portion of the stirring arm 31, and a plurality of slit grooves 33, usually 20 A stirrer assembly 41 having about 30 stirrer teeth 45 (similarly described later) is prepared, and a mounting piece 44 (similarly,
(Details will be described later) are sequentially inserted and fixed down, and for each row of stirring assemblies 41 corresponding to the hearth 14 of each stage, for each hearth 14, facing the respective drop outlet 15 In order to transfer the raw coal being processed at a preset speed, each stage is provided with an inclination angle in the direction opposite to each other in the range of about 5 to 30 °.

Therefore, in the case of a vertical multi-stage furnace constructed in this way,
Coking coal A to be supplied from the furnace top supply port 12 of the furnace body 11
From the uppermost hearth 14 to the lowermost hearth 14, the mixing and stirring are performed by the stirrer assemblies 41 that are suspended from the respective stirrer arms 31 corresponding to the respective stages, and each of the stirrers is transferred while being mixed. It flows down through the drop 15 and is chemically or physically treated during this transfer and is discharged from the furnace bottom discharge port 13. On the other hand, the furnace gas flows in the opposite direction to the flow of the coking coal A. Then, the gas flows from the lowermost side to the uppermost side through the dropping port 15 for each stage, and is discharged from the gas discharge port 19.

Next, FIG. 4 is a partial side view showing an outline of a stirring and transferring section of a raw material to be treated in a furnace configuration of a vertical multi-stage furnace to which this embodiment is applied, and FIG. FIG. 6 is a perspective view showing a detailed structure of the stirring assembly of the above, and FIGS. 7 (a) and 7 (b) are oblique views and one view showing the structure of an end fixing portion of the stirring arm of the same. FIGS. 8 (a) and 8 (b) are a front view and a plan view showing a detailed configuration of the same wedge rod for fixing.

In this embodiment, at the distal end of the stirring arm 31, as shown in FIGS. 4 and 5, a fixing seat 32 having mounting holes 32a, 32a formed on both sides is provided. As described above, a series of slit grooves 33 having a dovetail cross section along the longitudinal direction of the lower surface are formed,
A stopper 34 protrudes from the innermost portion of the slit groove 33, and normally, the upper surface including the tip portion is protectively covered with a heat-insulating castable 31a. Note that the configuration of FIG. 4 shows a mode in which the stirring teeth as in the conventional example are arranged on the base side where the influence of the inclination of the hearth 14 is relatively small.

Further, as shown in FIG. 6, the stirring assembly 41 has front and rear abutting surfaces 42 which also serve as a fitting ruler plate.
a and 42a are formed on each of the base plates 42, and a lower surface of the base plate 42 is provided with a predetermined mounting angle and is protruded. Four
A slide frame 43 formed with 3b, a mounting piece 44 fixed to the upper surface of the base plate 42 and fitted in the slit groove 33 and having an inverted dovetail groove shape, and a slide hole 43b of the slide frame 43 vertically. It is fitted in such a way that it can be slidably adjusted and hangs down.The stopper piece 45a protrudes to the left and right of the upper part. Then, the front and rear butting surfaces 42a of the base plate 42
Means are taken such as notching the edge relief portion 42b appropriately or making a concave portion 44a in the upper surface of the mounting piece 44.

Here, the stirring assembly 41 is substantially
The reason for the division into the stirring teeth 43 and the stirring teeth 45 is that the corrosion and the abrasion in the furnace described above are remarkable at the lower end tip portion where the raw coal A comes into direct contact with the coking coal A. This is because the purpose of replacement can be achieved only by replacing only the leading end, and the material can be effectively used, which is economically advantageous. Further, the stirring hole 45b is provided in the slide hole 43b of the slide frame 43.
The reason why the stopper piece 45a protrudes downward from the stirring tooth 45 by fitting the upper and lower slide freely so as to be adjustable is mainly because
In a normal state after being taken out of the furnace, the drooping length of the stirring tooth 45 is adjusted and set, and the stirring tooth 45 is set by the stopper piece 45a.
The stirrer teeth 45 after the droop length has been set can hold the set position by their own weight, but if necessary, slide only the stopper piece 45a. What is necessary is just to screw it temporarily on the surface of the frame 43 or to weld it. As for the material of each member constituting the stirring assembly 41, a stainless steel material having heat resistance may be used in a normal case. In particular, the material of the stirring tooth 45 that directly contacts the raw coal A is generally used. A heat-resistant stainless steel material containing Ni in general, for example, 10 to 20Ni, 25 to 30Cr steel can be used as a typical composition.

Thus, a plurality of the stirring assemblies 41 are prepared as described above, and as shown in FIGS. 4 and 5, with respect to the inside of the slit groove 33 of the stirring arm 31,
With the stirring teeth 45 facing a specific angle,
44 are sequentially inserted, and the abutting surfaces 42a of the base plate 42 are abutted against each other. The agitating assembly 41 at the forefront is fixed by a wedge rod 51 for fixing, which will be described below. The mounting intervals of the stirring teeth 45 are set in advance according to the front-rear width of the base plate 42, and the mounting range is appropriately set using the spacer 47 or the like.

In the case of the configuration of this embodiment, the base plate 42 of the stirring assembly 41 corresponding to the foremost part is provided with the stirring arm.
Similar mounting holes 42c, 4 corresponding to mounting holes 32a, 32a at 31
2c so as to be able to be fastened by the fixing wedge rod 51 through the holes 32a and 42c.
Instead of 42c, 42c, it is also possible to use the leading edge of the edge relief 42b.

Further, as shown in FIG. 8, the fixing wedge rod 51 has a wedge pin 52 having a tapered tip as a main body, and a wedge pin 52 integrated with the wedge pin 52 for insertion and removal at an upper portion. It comprises a head 53 having an operation hole 54 formed thereon, and it is preferable to use a heat-resistant stainless steel material as described above.

The wedge rod 51 for fixing is shown in FIG.
As shown in (b), the wedge rod attaching / detaching jig 61 is used to insert the distal end pin 63 of the rod portion 62 into the operation hole 54 for operation.
By dropping and fitting into the mounting holes 42c, 42c of the stirring assembly 41 through the mounting holes 32a, 32a of the stirring arm 31, The whole 9 of the stirring assemblies 41 fitted in a row in the groove 33 is fixedly fastened, and the wedge pin 52 having such a tapered tip portion.
According to this, it is extremely easy to align the mounting holes 32a and 42c with each other and to insert the mounting holes 32a and 42c through the mounting holes 32a and 42c. That is, in this case, the stirring arm 31
As a fastening means for fixing each of the stirring assemblies 41 at the tip end of the wedge rod, it is possible to fix the bolts and nuts which cannot be operated from a distant position as in the related art, and a wedge rod which is relatively easy to operate from a distant position. The drop is fixed by 51.

That is, as described above, the stirrer 45 rows of the stirrer assemblies 41 can be hung down on the stirrer arm 31. As described above, the stirrer arm 31 stirs along with the rotation of the rotating shaft 21 as described above. The hearth floor is formed by 45 rows of stirring teeth of the assembly 41.
It is possible to mix and stir the raw material coal A to be processed 14 and transfer it to be processed as expected.

9 (a) to 9 (g), the operation procedure of hot replacement of the stirring assembly 41 with respect to the stirring arm 31 will be described. This work procedure is for the case of replacing the conventional configuration with the configuration of this embodiment and exchanging it.

First, the rotating shaft 21 is stopped so that the stirring arm 31 to be replaced faces the center position of the work port 16, and the pressure in the furnace is slightly reduced to a negative pressure. After the control, the opening / closing door 17 of the work opening 16 is opened, and a curing iron plate 64 or the like is appropriately spread on the surface of the hearth 14 below the tip of the stirring arm 31 or the raw coal A on the hearth 14. In this state, for example, a shaving tool 65 suspended from above by a chain block (not shown) via a hanging string is inserted from the work opening 16, and the stirring tool 31 is used by the shaving tool 65. Once the heat-insulating castable 31a covering the front end portion is crushed and removed to expose the bolts and nuts at the fixed fastening portion (FIG. 9 (a)), the lance-shaped blower 66 is inserted from the work opening 16 as described above, and The front side heads of the bolts and nuts are blown away from the outside of the furnace ((b) in the figure), and a bolt removing jig 67 is similarly inserted from the work port 16 to remove the wedge of the rod portion 68. The bolts that are difficult to come out of the parts 69
The nut is removed by driving it into the back side of the nut (FIG. 3 (c)). At this time, these broken pieces of the heat-insulated castable 31a or the blown bolts and nuts will be received on the cured iron plate 63, etc.
There is no danger that this will be mixed in the raw coal A being treated (in this operation, the conventional stirring teeth 45 are replaced with the stirring teeth of this embodiment, ie, the stirring assembly 41 having the stirring teeth 45). Therefore, if the stirring assembly 41 of this embodiment is to be taken out, as will be clear from the following description, here, the wedge rod attaching / detaching jig 61 is used for fixing. Just pull out the wedge rod 51).

Next, using a stirring tooth extraction jig 70 composed of a rod 71 having a hanging piece 73 protruding from a tip pin 72, similarly insert the rod 71 from the work port 16, and The stirrer assembly to be replaced, which is installed in the slit groove 33 of the stirrer 31, that is, the conventional stirrer tooth 45 which has become unusable due to corrosion and wear (again, the stirrer assembly 41 of this embodiment) If it is to be replaced with a stirrer, it corresponds to the stirrer teeth 45 of the stirrer assembly 41).
Engage the hook 73 with the hook 43a to engage the slit groove 33.
Are sequentially extracted by a guide, and all the stirring teeth 45 to be replaced are removed and taken out of the furnace ((d) in the same figure). In addition, in the stirring tooth extraction jig 70, the slit groove 33 in the stirring arm 31 has a considerable length, and since the operation stroke of the extraction operation is performed in a relatively long section, The length of the portion 71 is set to, for example, two types that are set to be long and short. However, the work can be easily performed and is convenient. If the stirring assembly 41 is removed from the furnace, it is removed from the slide frame 43 of each stirring assembly 41, the stirring tooth 45 to be replaced is replaced, and a new stirring tooth 45 is attached instead. Fix and prepare for each).

Subsequently, this time, a pushing piece 77 is protruded from the tip pin 76, and a stirring tooth pushing jig 74 composed of a rod 75 provided with a supporting piece 78 below is used. Hole 43 for fitting and disassembling a simple stirring assembly 41 (or a stirring assembly 41 replaced with a new stirring tooth 45).
a, the tip pin 76 is engaged and held in advance, and the pushing piece 77 is pressed against the slide frame 43 surface,
In a state where the stirring teeth 45 themselves are supported by the support pieces 78 so as to be lifted, similarly, the rod portions 75 are inserted from the work ports 16, and these are used as guides in the slit grooves 33 of the stirring arm 31. Then, the agitation assemblies 41 having the new agitation teeth 45 are sequentially mounted one by one from the innermost part to the foremost part (FIG. 9E). Then, in this case, by lifting and supporting the stirring teeth 45 by the support pieces 78, in order to reduce the suspension length of the stirring teeth 45 and bring them in,
For example, even when the work opening 16 is narrow, it is possible to carry it in with a sufficient margin. Also in this case, for the same reason as in the previous example, it is preferable that the length of the rod portion 75 of the stirring tooth pushing jig 74 be of two types, long and short.

Then, at the time when the mounting of the new stirring assembly 41 at the foremost end is completed, the tip pin 63 is inserted and held in the operation hole 54 of the fixing wedge rod 51 using the wedge rod attaching / detaching jig 61. Also in this case, the rod portion 62 is inserted from the work opening 16, and the tapered end of the wedge pin 52 of the fixing wedge rod 51 is inserted from the mounting hole 32 a of the stirring arm 31 to the mounting hole 42 c of the stirring assembly 41. On the other hand, the stirrer arm 31 is dropped into the fixed seat 32 of the stirrer arm 31 until the head 53 abuts, and these are fixedly fastened. (F) in FIG.

Further, thereafter, the heat-insulating castable 31a is cast and solidified again at the tip end of the stirring arm 31 exposed in the first step (a) by using a receiving plate 79 or the like as a casting jig, and is in a state before replacement. (FIG. 6F). That is, as described above, a series of replacement work of the stirring assembly 41 can be completed as expected in a hot state without shutting down the furnace.
Is closed, the inside of the furnace is returned to a predetermined pressure, and the operation of the furnace is restarted.

In the above embodiment, the replacement operation of the stirring teeth is performed hot, but it is needless to say that the same operation can be performed at normal temperature or low temperature.

〔The invention's effect〕

As described in detail above, according to the present invention, a hearth having a central portion opened in a furnace body is provided in multiple stages, and a furnace body partial work port corresponding to each hearth is arranged, and a central trench of each hearth is provided. The rotating shaft is rotatably erected through, and from the rotating shaft, a stirring arm is projected in a radial direction corresponding to each hearth, and the hearth surface is inserted into a slit groove formed on the lower surface of each stirring arm. In a vertical multi-stage floor furnace equipped with a large number of stirring teeth hanging down toward, having a mounting piece on the upper surface of the base plate,
A stirrer assembly with a stirrer having a stopper piece at the top slideable up and down and fitted so as to be settable is provided on a slide frame hanging down on the lower surface. In a state where the mounting piece of the stirring assembly is detachably mounted, the stirring assembly is fixed by a fixing wedge rod inserted into a mounting hole at the tip of the stirring arm. It ’s hot,
By extracting the fixing wedge rod from the mounting hole at the tip of the stirring arm, the stirring assembly was taken out of the furnace,
The stirring tooth to be replaced can be replaced with a new stirring tooth, and at the same time, the droop length of the new stirring tooth can be easily adjusted and set according to the state of the hearth, and the slide frame On the other hand, since the dripping length of the stirring teeth is reduced, the droop length of the stirring teeth can be set as desired without the droop length being restricted by the size of the work opening. Yes, again, after installing the stirring assembly whose tip has been replaced with a new stirring tooth from the tip of the stirring arm, re-insert the fixing wedge rod and replace the stirring arm with a new stirring tooth. As a result, it is not necessary to suspend the operation of the furnace itself only for replacement and replacement of the stirring assembly, and at the same time, various operations associated with the suspension can be performed. Can effectively improve the inconvenience of In addition, it is possible to improve the productivity and extend the life of the furnace, and at the same time, when replacing the stirring teeth, it is only necessary to replace the portion corresponding to the tooth tip at the lower end. It has excellent features such as effective utilization.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing an outline of a general vertical multi-stage furnace, and FIGS. 2 (a), (b) and (c) show a furnace top, a furnace wall and a furnace of the same furnace body. FIG. 3 is a schematic sectional view showing a detailed configuration of a bottom portion, FIG. 3 is a partial perspective view showing an outline of a stirring and transferring section in the same furnace configuration, and FIG. 4 is a vertical view to which an embodiment of the present invention is applied. Partial side view showing an outline of a stirring and transferring unit in a furnace configuration of a multi-stage floor furnace, FIG. 5 is a cross-sectional view showing a structure of a stirring arm unit of the above, and FIG. 6 is a perspective view showing a detailed structure of a stirring assembly of the same , FIG. 7 (a),
(B) is a perspective view and a partially longitudinal side view showing a configuration of an end fixing portion of the stirring arm, and FIGS. 8 (a) and (b) are a front view and a detailed configuration of a wedge rod for fixing the same. FIGS. 9 (a) to 9 (g) are explanatory views sequentially showing work procedures for exchanging and replacing the stirring assembly with respect to the stirring arm at the same time. 11 Furnace body, 12 Supply port for raw coking coal, 13 Discharge outlet for processed coking coal, 14 Hearth, 15 Fall port, 16
Work port, 17 ... Open / close door, 18 ... Gas outlet, 19 ...
Work deck. 21 ... rotating shaft, 22 ... drive unit, 23, 24 ... seal, 25 ...
... cooling blower. 31 ... Stirring arm, 31a ... Insulated castable, 32 ...
Fixed seat, 32a: Mounting hole, 33: Slit groove. 41: stirring assembly, 42: base plate, 42a: abutting surface, 42b: edge relief, 43: slide frame mounting plate, 43a
…… Punch holes for insertion / removal, slide frame, 44 …… Mounting pieces, 45
…… agitating teeth, 46 …… bolts and nuts, 47 …… spacers. 51 Wedge rod for fixing, 52 Wedge pin, 53 Head, 54 Operation hole. 61: Wedge rod attachment / detachment jig, 62: Rod part, 63: Tip pin, 64: Cured iron plate, 65: Sharpening tool, 66: Fusing device, 67: Bolt removal jig, 68 ... … Rod part, 69 ……
Tip wedge part, 70… Stirring tooth pull-out jig, 71 …… Rod part, 72 …… Tip pin, 73 …… Hanging piece, 74 …… Stirring tooth pushing jig, 75 …… Rod part, 76… ... Tip pin, 77
… Push-in piece, 78… Support piece, 79 …… Receiving plate. A: Coal to be treated.

Claims (1)

(57) [Claims] A hearth having a central portion opened in a furnace body is provided in multiple stages, and a work port is arranged in a furnace body portion corresponding to each hearth, and a rotating shaft is rotated through a central portion opening of each hearth. The stirring arms are freely erected and protrude radially from the rotating shafts corresponding to the respective hearths, and hang down toward the hearth surface in slit grooves formed on the lower surface of each stirring arm. In a vertical multi-stage furnace equipped with a large number of stirring teeth, positioning is set by sliding up and down the stirring teeth with stopper pieces on the upper part of the slide frame with the mounting piece on the upper surface of the base plate and the hanging part on the lower surface. A stirrer assembly which is fitted so as to be able to be fitted, and a fixing piece which is inserted into a mounting hole at the tip of the stirrer arm in a state where a mounting piece of the stirrer assembly is detachably mounted in a slit groove of the stirrer arm. Stirring assembly by wedge rod Vertical multistage bed furnace, characterized in that fixed.