JP2016153704A - Continuous type calcination furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a smooth discharging of gas also at a lower stage calcination part at a continuous type calcination furnace in which a plurality of calcination parts are laminated in a vertical direction.SOLUTION: A continuous type calcination furnace 10 has a first calcination part 12 and a second calcination part 14 laminated in a vertical direction and arranged. A second discharged gas flow passage 60 for discharging gas kept in the second calcination part has flow inlets 62a, b in the second calcination part and opened into an upper space of a second transport device 32 and a discharged gas flow passage for guiding gas flowed through the flow inlets out of a furnace body 20. The discharged gas flow passage has a first flow passage crossing with a transporting direction of the second transporting device below the first calcination part and above the second transporting device and extending in a horizontal direction.SELECTED DRAWING: Figure 2

Description

  The present specification relates to a continuous firing furnace for firing a workpiece. Specifically, the present invention relates to a technique for discharging gas from a continuous firing furnace to the outside of the furnace.

  The workpiece may be fired using a continuous firing furnace (for example, roller hearth kiln, etc.). In this type of continuous firing furnace, the object to be processed put into one end of the furnace body is usually conveyed toward the other end of the furnace body. The workpiece is baked while being conveyed from one end of the furnace body to the other end. When the workpiece is fired, gas may be generated from the workpiece. When the gas generated from the object to be processed stays in the furnace, a problem of contamination of the object to be processed occurs. For this reason, the baking furnace provided with the exhaust flow path for exhausting the gas in a furnace smoothly is developed (for example, patent document 1).

  In the technique of Patent Document 1, an exhaust passage is formed on the upper wall of the firing furnace. The exhaust passage extends upward in the upper wall of the firing furnace, and the exhaust gas in the firing furnace is discharged from the upper wall of the firing furnace to the outside of the furnace. Thereby, the gas generated from the object to be processed is smoothly discharged outside the furnace, and the gas generated from the object to be processed is suppressed from staying in the furnace.

JP 2002-294521 A

  Some continuous firing furnaces are provided with a plurality of firing parts for firing the object to be processed, and the plurality of firing parts are stacked in the vertical direction in order to improve space efficiency. In such a continuous firing furnace, an exhaust passage is formed in the upper wall of the firing section arranged at the uppermost stage, and gas can be discharged from the upper wall to the outside of the furnace. However, since the other firing portions are disposed above the firing portion other than the uppermost stage, an exhaust passage extending upward cannot be formed on the upper wall of the firing portion. For this reason, about the baking parts other than the uppermost stage, there existed a problem that the gas in a baking part could not be discharged | emitted smoothly.

  The present specification discloses a continuous firing furnace in which a plurality of firing parts are stacked in the vertical direction and can discharge gas smoothly even in firing parts other than the uppermost stage.

  A continuous firing furnace disclosed in the present specification includes a furnace body having at least a first firing part for firing an object to be treated and a second firing part for firing the object to be treated, and a first firing part in the first firing part. A first conveying device that conveys an object to be processed that is placed at one end of the first baking unit to the other end of the first baking unit, and a second baking unit that is arranged in the second baking unit. A second conveying device that conveys an object to be processed input to one end of the unit to the other end of the second baking unit, a first exhaust passage that discharges gas in the first baking unit, and a second baking A second exhaust passage for discharging the gas in the section. The first firing part is disposed above the second firing part, and the first firing part and the second firing part are isolated from each other. The second exhaust flow path is an inflow opening that opens in the space above the second transfer device in the second firing section, an exhaust flow path section that guides the gas flowing in from the inflow opening to the outside of the furnace body, have. The exhaust flow path section includes a first flow path section that extends below the first baking section and above the second transport apparatus, intersects the transport direction of the second transport apparatus, and extends in the horizontal direction. Have.

  In the continuous firing furnace, the second exhaust flow path for discharging the gas in the second firing section intersects the transport direction of the second transport device above the second transport device and in the horizontal direction. The first flow path portion extends in the direction. For this reason, by adjusting the position, length, and the like of the first flow path unit, the inflow port can be arranged at an arbitrary position above the second transfer device, and the gas in the second baking unit can be smoothly discharged. Can be discharged. Here, the above-mentioned “horizontal direction” includes not only the case where it is completely horizontal, but also the case where it is inclined or curved with respect to the horizontal direction. For this reason, for example, when the ceiling shape of the second firing portion is an arch shape, the first flow path portion is curved in accordance with the arch shape. Is equivalent to

1 is a diagram showing a schematic configuration of a continuous firing furnace of Example 1. FIG. The longitudinal cross-sectional view of the continuous-type baking furnace of Example 1 (The figure which looked at the carrying-out side from the inlet side, and is the II-II sectional view taken on the line of FIG. 1). The figure for demonstrating the structure of the exhaust flow path provided in the continuous-type baking furnace of Example 1. FIG. IV-IV sectional view taken on the line of FIG. The longitudinal cross-sectional view of the continuous-type baking furnace of a modification (The figure which looked at the carrying-out side from the inlet side similarly to FIG. 2). The figure for demonstrating the structure of the exhaust flow path provided in the continuous-type baking furnace of a modification.

  The main features of the embodiments described below are listed. The technical elements described below are independent technical elements and exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Absent.

(Characteristic 1) In the continuous firing furnace disclosed in the present specification, the exhaust flow path section is connected to the downstream end of the first flow path section and extends in parallel with the transport direction of the second transport apparatus. And a third flow path portion connected to the downstream end of the second flow path section and extending in a direction intersecting with the transport direction of the second transport device. According to such a configuration, the gas flowing in the first flow path portion is changed in the direction of flow by the second flow path portion, and further, the direction of flow in the third flow path portion is changed and then discharged to the outside of the furnace. . For this reason, the foreign material in the exhaust gas is easily solidified on the downstream side of the second flow path portion, and the foreign material in the exhaust gas is suppressed from solidifying in the first flow path portion. Since the solidification of the foreign material in the 1st flow path part connected to the inflow port can be suppressed, contamination of the to-be-processed object in a baking part can be suppressed.

(Feature 2) In the continuous firing furnace disclosed in the present specification, the furnace body is disposed between the first firing part and the second firing part, and the first firing part and the second firing part are provided. You may have the partition which isolates. The inflow port of the second exhaust flow path may be formed in a partition wall, and the first flow path portion of the second exhaust flow path may extend in the horizontal direction intersecting with the conveyance direction of the object to be processed in the partition wall. . According to such a configuration, since the inflow port and the first flow path portion are provided in the partition wall (ceiling of the second firing unit), the inflow port can be arranged at an arbitrary position above the second transfer device. it can. For this reason, the gas in a 2nd baking part can be discharged | emitted smoothly.

(Characteristic 3) In the continuous firing furnace disclosed in the present specification, the second exhaust flow path is disposed in a space above the second transfer device in the second firing unit, You may have the exhaust pipe extended from one side wall to the other side wall. A through hole penetrating the tube wall may be formed in the exhaust pipe. The inflow port of the second exhaust flow path may be a through hole formed in the exhaust pipe, and the first flow path part of the exhaust flow path part may be a flow path in the exhaust pipe. According to such a configuration, the gas in the second firing section is discharged out of the furnace using the exhaust pipe disposed in the second firing section. For this reason, an inlet can be arrange | positioned in the arbitrary positions above the 2nd conveying apparatus by adjusting the position of an exhaust pipe and the position of the through-hole formed in an exhaust pipe. For this reason, the gas in a 2nd baking part can be discharged | emitted smoothly.

First Example Hereinafter, a continuous firing furnace 10 according to an example will be described with reference to the drawings. As shown in FIGS. 1 and 2, the continuous firing furnace 10 includes a furnace body 20, a first firing section 12 (an example of a first firing section) and a second firing section 14 ( An example of a second firing section). As is apparent from the figure, the first firing part 12 is disposed above the second firing part 14, and the first firing part 12 and the second firing part 14 are separated by a partition wall 20d.

  The furnace body 20 includes a ceiling wall 20a, a bottom wall 20g, side walls 20b, 20c, 20e, and 20f, and a partition wall 20d. The 1st baking part 12 is surrounded by the ceiling wall 20a, the side walls 20b and 20c, and the partition 20d. The second firing section 14 is surrounded by a partition wall 20d, side walls 20e and 20f, and a bottom wall 20g. As a result, tunnel-like heating regions 16a to 16c are formed in the firing parts 12 and 14, respectively.

  The first baking unit 12 is provided with a first roller conveyor 22 (an example of a first conveying device), and the second baking unit 14 is provided with a second roller conveyor 32 (an example of a second conveying device). Yes. The first roller conveyor 22 is driven by a driving device 28 disposed on the side of the furnace body 20. The second roller conveyor 32 is driven by a driving device 38 disposed on the side of the furnace body 20. At one end of the heating region 16a of each firing section 12, 14, an input port 18a for inputting an object to be processed is formed. At the other end of the heating region 16c of each firing section 12, 14, a carry-out port 18b for carrying out the object to be processed is formed. The first roller conveyor 22 conveys the object to be processed that has been input to the input port 18 a of the first baking unit 12 to the carry-out port 18 b of the first baking unit 12. The 2nd roller conveyor 32 conveys the to-be-processed object thrown into the insertion port 18a of the 2nd baking part 14 to the carrying-out port 18b of the 2nd baking part 14. As shown in FIG. The objects to be processed put into the firing units 12 and 14 are fired while being conveyed from the loading port 18a to the carry-out port 18b. As a to-be-processed object, the positive electrode material of a lithium ion battery, a negative electrode material, etc. are mentioned, for example. When the positive electrode material or the negative electrode material of the lithium ion battery is fired using the continuous firing furnace 10, these objects to be treated can be accommodated in the mortar W and transported. In the continuous firing furnace 10 of the present embodiment, a plurality of mortars W can be conveyed on the roller conveyors 22 and 32 in a state of being arranged in the width direction of the furnace body 20.

  Heaters 24a and 24b are disposed in the heating regions 16a to 16c of the first firing unit 12, respectively. The heater 24 a is disposed above the first roller conveyor 22, and the heater 24 b is disposed below the first roller conveyor 22. Heaters 34a and 34b are disposed in the heating regions 16a to 16c of the second baking unit 14, respectively. The heater 34 a is disposed above the second roller conveyor 32, and the heater 34 b is disposed below the second roller conveyor 32. The heaters 24a, 24b, 34a, and 34b are connected to the power supply device 80. When power is supplied from the power supply device 80 to the heaters 24a, 24b, 34a, and 34b, the heaters 24a, 24b, 34a, and 34b generate heat, and the object to be processed is heated. In addition, the partition plates 26 and 36 are arrange | positioned in the boundary of adjacent heating area | regions (for example, 16a and 16b). Thereby, the atmospheric temperature of each heating area | region 16a-16c is controlled separately.

  In addition, in each of the heating regions 16a to 16c of the firing units 12 and 14, introduction flow paths (not shown) for introducing the atmospheric gas into the heating regions 16a to 16c are formed. The introduction flow path is an end of each heating region 16a to 16c on the side of the carry-out port 18b and is disposed below the roller conveyors 22 and 32. By introducing the atmospheric gas from the introduction flow path to each of the heating regions 16a to 16c, the firing atmosphere of each of the heating regions 16a to 16c is controlled. Since the atmospheric gas is introduced into each of the heating regions 16a to 16c of the firing units 12 and 14, the first exhaust for discharging the atmospheric gas to each of the heating regions 16a to 16c of the firing units 12 and 14 is provided. A flow path 40 or a second exhaust flow path 60 is provided. Hereinafter, the first exhaust passage 40 and the second exhaust passage 60 will be described.

  The first exhaust flow path 40 is provided in each heating region 16 a to 16 c of the first firing unit 12. The first exhaust passage 40 exhausts the gas in the heating regions 16 a to 16 c of the first firing unit 12 to the outside of the furnace body 20. The first exhaust passage 40 is provided in the ceiling wall 20a. Specifically, the first exhaust flow path 40 includes inflow ports 42a and 42b, intake portions 44a and 44b connected to the inflow ports 42a and 42b, and exhaust flow channels connected to the intake portions 44a and 44b. Department.

  The inflow ports 42 a and 42 b are formed in the ceiling wall 20 a and open into a space above the first roller conveyor 22. The positions of the inflow ports 42a and 42b are formed at positions from the center in the width direction of the ceiling wall 20a (the width direction of the furnace body 20 and the direction perpendicular to the conveyance direction of the workpiece). The gas in the heating regions 16a to 16c tends to stay at a position above the center in the width direction of the ceiling wall 20a. For this reason, by providing the inlets 42a and 42b at equal positions from the center in the width direction of the ceiling wall 20a, the gas in the heating regions 16a to 16c is smoothly discharged out of the furnace. The intake portions 44a and 44b extend upward from the inflow ports 42a and 42b in the ceiling wall 20a. The exhaust passage portion is provided in the ceiling wall 20a, and its downstream end 50a protrudes from the side surface of the furnace body 20 to the outside of the furnace. In addition, since the exhaust flow path part of the 1st exhaust flow path 40 is the same structure as the exhaust flow path part of the 2nd exhaust flow path 60 mentioned later, the detailed description is abbreviate | omitted here.

  In addition, the 1st exhaust flow path 40 is provided in the edge part by the side of the inlet 18a of each heating area | region 16a-16c. Since the introduction flow path for introducing the atmospheric gas is provided at the end of each heating region 16a to 16c on the carry-out port 18b side, in each heating region 16a to 16c, from the end on the carry-out port 18b side to the input port 18a side. Atmospheric gas will flow toward the end.

  Similar to the first exhaust flow path 40, the second exhaust flow path 60 is provided in each heating region 16 a to 16 c of the second firing unit 14. The second exhaust flow path 60 is provided in the partition wall 20 d and exhausts the gas in each heating region 16 a to 16 c of the second firing unit 14 to the outside of the furnace body 20.

  The second exhaust passage 60 includes inflow ports 62a and 62b, intake portions 64a and 64b connected to the inflow ports 62a and 62b, and exhaust flow passage portions (66a and 66b) connected to the intake portions 64a and 64b. 68; 70 (see FIGS. 3 and 4)). The inflow ports 62 a and 62 b are formed in the partition wall 20 d and open to a space above the second roller conveyor 32. The positions of the inflow ports 62a and 62b are formed at positions from the center in the width direction of the partition wall 20d. Thereby, the gas staying in the vicinity of the central portion of the partition wall 20d can be smoothly discharged out of the furnace. The intake portions 64a and 64b extend upward from the inflow ports 62a and 62b in the partition wall 20d. The exhaust passage portions (66a, 66b; 68; 70) are provided in the partition wall 20d, and the downstream end 70a protrudes from the side surface of the furnace body 20 to the outside of the furnace. That is, the exhaust flow path portions (66a, 66b; 68; 70) are disposed below the first baking unit 12 and above the second roller conveyor 32. The configuration of the exhaust flow path portions (66a, 66b; 68; 70) will be described in detail later.

  In addition, the 2nd exhaust flow path 60 is provided in the edge part by the side of the inlet 18a of each heating area | region 16a-16c similarly to the 1st exhaust flow path 40. As shown in FIG. Also in the second firing section 14, an introduction flow path for introducing atmospheric gas is provided at the end of each heating region 16a to 16c on the carry-out port 18b side. Therefore, in each heating region 16a to 16c, on the carry-out port 18b side. Atmospheric gas will flow from the end toward the end on the inlet 18a side.

  Here, the exhaust passage portions (66a, 66b; 68; 70) of the second exhaust passage 60 will be described with reference to FIGS. As shown in FIGS. 2 to 4, the exhaust flow path section includes a first flow path section 66a connected to the intake section 64a, a first flow path section 66b connected to the intake section 64b, and a first flow path. A second flow path portion 68 connected to the path portions 66 a and 66 b and a third flow path portion 70 connected to the second flow path portion 68 are configured. The first flow path portions 66a and 66b extend in a direction orthogonal to the conveyance direction of the workpiece, and extend horizontally from the downstream ends of the intake portions 64a and 64b toward the center in the width direction of the partition 20d. The second flow path portion 68 extends in parallel with the conveyance direction of the workpiece from the downstream ends of the first flow path portions 64a and 64b. The third flow path part 70 extends in parallel with the direction in which the first flow path parts 64 a and 64 b extend from the downstream end of the second flow path part 68 toward the side surface of the furnace body 20. Since the second flow path portion 68 extends in parallel with the conveyance direction of the object to be processed, the third flow path portion 70 is disposed on the inlet 18a side with respect to the first flow path portions 64a and 64b. Yes. In addition, since the exhaust flow path part of the 1st exhaust flow path 40 is comprised similarly to the exhaust flow path part (66a, 66b; 68; 70) of the 2nd exhaust flow path 60, it is the 1st exhaust flow path. The 40 exhaust flow path sections also include a first flow path section, a second flow path section, and a third flow path section.

  In each of the exhaust passages 40 and 60 described above, the gas flowing in from the inlets 42a, 42b, 62a, and 62b flows through the intake portions 44a, 44b, 64a, and 64b and the exhaust passage portion, and outside the furnace body 20. Exhausted. In the exhaust flow path section, the gas flowing through the first flow path section 66a and the gas flowing through the first flow path section 66b merge at the upstream end of the second flow path section 68, and the combined gas is the second flow path section. 68 and the third flow path portion 70. For this reason, the foreign material (for example, tar etc.) in exhaust gas is easy to solidify in the 2nd channel part 68, and it is suppressed that it solidifies in the 1st channel parts 66a and 66b. For this reason, it can suppress that the foreign material solidified in the baking parts 12 and 14 falls from the 1st flow-path parts 66a and 66b, and the situation that a to-be-processed object is contaminated arises.

  In the above embodiment, the first exhaust passage 40 is formed in the ceiling wall 20a of the furnace body 20, and the second exhaust passage is provided in the partition wall 20d that separates the first firing portion 12 and the second firing portion 14. However, the technology disclosed in the present specification is not limited to such a form. For example, as shown in FIG. 5, the exhaust flow path may be configured using exhaust pipes 82 and 84 disposed in the firing sections 12 and 14.

  That is, the exhaust pipe 82 is arrange | positioned above the 1st roller conveyor 22 and the heater 24a in the 1st baking part 12. As shown in FIG. The exhaust pipe 82 extends from the side wall 20b of the first firing part 12 to the side wall 20c. A plurality of through holes (not shown) are formed at the lower end of the exhaust pipe 82. The gas in the first firing unit 12 is sucked into the exhaust pipe 82 through the through hole, and exhausted to the outside of the furnace body 20 through the flow path in the exhaust pipe 82.

  Similarly, an exhaust pipe 84 is disposed above the second roller conveyor 32 and the heater 34a in the second baking section 14. The exhaust pipe 84 extends from the side wall 20e of the second firing part 12 to the side wall 20f. At the lower end of the exhaust pipe 82, a plurality of through holes (another example of the inflow port) (not shown) are formed. The gas in the second firing section 14 is sucked into the exhaust pipe 84 through the through hole, and passes through the flow path (another example of the first flow path section) in the exhaust pipe 84 to the outside of the furnace body 20. Exhausted. That is, as shown in FIG. 6, the upstream end of the second flow path portion 86 is connected to the downstream end of the exhaust pipe 84, and the third flow path portion 88 is connected to the downstream end of the second flow path portion 86. ing. The second flow path portion 86 extends in the side wall 20f in parallel with the conveyance direction of the workpiece. The third flow path portion 88 extends in parallel with the direction in which the exhaust pipe 84 extends. The gas in the exhaust pipe 84 is exhausted outside the furnace through the second flow path portion 86 and the third flow path portion 88. By providing the second flow path portion 86 and the third flow path portion 88, the gas in the exhaust pipe 84 is suppressed from being cooled, and the foreign matter is suppressed from solidifying in the exhaust pipe 84. As a result, it is possible to suppress a situation in which foreign matter falls from the through hole of the exhaust pipe 84 into the second firing part 14 and the object to be processed is contaminated.

  Even in the case of using the exhaust pipes 82 and 84 as in the continuous firing furnace 100 shown in FIG. 5, the gas in each firing section 12 and 14 can be exhausted smoothly. By using the exhaust pipes 82 and 84, the number and positions of the through holes can be set relatively freely, and the gas in the firing sections 12 and 14 can be discharged more smoothly. In the case where the exhaust passage is configured by using the exhaust pipe, the through hole near the center of the firing part may have a large diameter, and the through hole near the side wall may have a small diameter. With this configuration, a large amount of gas near the center of the firing portion is sucked, while the amount of gas sucked near the side wall is suppressed. This makes it easy to keep the temperature in the firing part uniform.

  As mentioned above, although the specific example of the technique disclosed by this specification was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

DESCRIPTION OF SYMBOLS 10,100 Continuous-type baking furnace 12 1st baking part 14 2nd baking part 16a, 16b, 16c Heating area 18a Input port 18b Carry-out port 20 Furnace body 22, 32 Roller conveyor 24, 34 Heater 26 Partition plate 28, 38 Drive device 40 1st exhaust flow path 42a, 42b, 62a, 62b Inlet 44a, 44b, 64a, 64b Intake part 66a, 66b 1st flow path part 68 2nd flow path part 50, 70 3rd flow path part 80 Power supply 82, 84 Exhaust pipe 86 Second flow path portion 88 Third flow path portion

Claims (4)

A continuous firing furnace for firing a workpiece,
A furnace body having at least a first baking part for baking the object to be processed and a second baking part for baking the object to be processed;
A first transfer device that is disposed in the first baking unit and transfers an object to be processed, which is put into one end of the first baking unit, to the other end of the first baking unit;
A second transport device that is disposed in the second firing section and transports an object to be processed that is put into one end of the second firing section to the other end of the second firing section;
A first exhaust passage for discharging the gas in the first firing section;
A second exhaust flow path for discharging the gas in the second firing section,
The first firing part is disposed above the second firing part, and the first firing part and the second firing part are isolated from each other,
The second exhaust passage is an inflow opening that opens into a space above the second transfer device in the second firing section, and an exhaust that guides the gas flowing in from the inflow opening to the outside of the furnace body. And a flow path part,
The exhaust flow path section extends below the first baking section and above the second transfer apparatus, intersects the transfer direction of the second transfer apparatus, and extends in the horizontal direction. A continuous firing furnace having a flow path portion. The exhaust passage section is
A second flow path connected to the downstream end of the first flow path and extending in parallel with the transport direction of the second transport device;
2. The continuous type according to claim 1, further comprising a third flow path portion connected to a downstream end of the second flow path portion and extending in a direction intersecting with a transport direction of the second transport device. Firing furnace. The furnace body has a partition wall disposed between the first firing portion and the second firing portion, and separating the first firing portion and the second firing portion,
The inlet of the second exhaust passage is formed in the partition;
3. The continuous firing furnace according to claim 1, wherein the first flow path portion of the second exhaust flow path extends in a horizontal direction intersecting a conveyance direction of an object to be processed in the partition wall. The second exhaust passage is disposed in a space above the second transfer device in the second firing unit, and an exhaust pipe extending from one side wall of the second firing unit to the other side wall. Have
In the exhaust pipe, a through-hole penetrating the pipe wall is formed,
The inflow port of the second exhaust passage is the through hole formed in the exhaust pipe;
The continuous firing furnace according to claim 1 or 2, wherein the first flow path portion of the exhaust flow path portion is a flow path in the exhaust pipe.

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