JP2018128188A - Heat treatment furnace and heat treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of a transportation trouble of a truck in a truck transportation type heat treatment furnace.SOLUTION: A truck transportation type heat treatment furnace 1 configured to transport an object W to be treated with a truck 30, includes a heating unit 18 configured to heat the object W to be treated mounted on the trunk 30, and a gas supply unit 19 provided below the heating unit 18 and configured to supply gas into the furnace. The heat treatment furnace 1 is configured such that gas supplied from the gas supply unit 19 flows from a lower side toward an upper side between the truck 30 and an inner surface of a side wall 1b of the furnace.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a cart-conveying heat treatment furnace and a heat treatment method for conveying an object to be processed by a cart.

  Waste containing harmful PCBs that are currently banned is detoxified by heat treatment in a dedicated incinerator. Patent Document 1 discloses a method for detoxifying PCB-containing waste by heating it to a temperature of 1100 ° C. or higher. In Patent Document 1, a cart-conveying heat treatment furnace that conveys waste with a cart is used. However, in a conventional cart-conveying heat treatment furnace, as shown in Patent Document 2, In general, a labyrinth seal structure is adopted so that a narrow zigzag gap is formed between them. With such a labyrinth seal structure, by reducing the flow rate of atmospheric gas flowing from the upper space to the lower space of the carriage, the temperature rise near the hearth is suppressed and the transportation system such as the wheels and axles of the carriage is protected. .

JP2013-184089A JP 2011-158201 A

  Even in a heat treatment furnace employing the above labyrinth seal structure, corrosion and wear of the wheels proceed when repeated heat treatment is performed. As the corrosion or wear of the wheels progresses, the variation in the wheel diameter among the plurality of wheels and the variation in the wheel diameter for each part within the same wheel increase. Along with this, fluctuations in the strength of the wheel hits against a member (for example, a rail) with which the wheel comes into contact occur, and the conveyance load increases. As a result, the load on the pusher pusher used when the cart is pushed into the furnace increases, and a trouble that the conveyance stops due to an increase in the pusher pressure occurs.

  This invention is made | formed in view of the said situation, and aims at suppressing generation | occurrence | production of the conveyance trouble of a trolley | bogie in a trolley | bogie conveyance type heat treatment furnace.

  As a result of repeated investigations on the factors that cause the corrosion and wear of the wheels by the present inventors, soot, NOx gas, HCl gas, etc., generated during heat treatment of the processed material, the labyrinth seal structure as shown in FIG. It has been found that the corrosion and wear of the wheels 31 are promoted by reaching the wheels 31 of the carriage 30 through 80 gaps.

  That is, the present invention that solves the above-described problems is a cart-conveying heat treatment furnace that conveys a processed material by a carriage, and includes a heating unit that heats the processed product placed on the cart, and a lower part of the heating unit. A gas supply unit configured to supply gas into the furnace, and configured such that the gas supplied from the gas supply unit flows between the carriage and the inner surface of the side wall of the furnace from below to above. It is characterized by being.

  According to another aspect of the present invention, there is provided a heat treatment method for carrying out a heat treatment of a processed material by conveying the processed material with a carriage, and when performing the heat treatment, the space between the carriage and the inner wall of the furnace wall is upward from below. The gas is supplied from below the heating unit that heats the processing object placed on the carriage so that the gas flows toward the bottom.

  In the heat treatment according to the present invention, the gas supplied below the heating section during the heat treatment of the processed material flows from the lower side to the upper side between the side surface of the carriage and the inner surface of the side wall of the furnace. Thereby, the soot and acid gas which generate | occur | produce at the time of heat processing become difficult to reach the wheel of a trolley | bogie. As a result, it is possible to suppress the corrosion and wear of the wheels due to soot and acid gas.

  ADVANTAGE OF THE INVENTION According to this invention, the corrosion and abrasion of a trolley | bogie by the soot and acid gas which generate | occur | produce at the time of heat processing can be suppressed, and generation | occurrence | production of the conveyance trouble of a trolley | bogie can be suppressed.

It is a figure which shows the flow of the soot and acid gas which pass the clearance gap of the labyrinth seal structure in the conventional cart conveyance type heat treatment furnace. It is a figure showing a schematic structure of a cart conveyance type heat treatment furnace concerning an embodiment of the present invention. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is an enlarged view of the heating part and gas supply part which concern on embodiment of this invention. It is a figure for demonstrating the top-plate position detection apparatus of the trolley | bogie which concerns on embodiment of this invention. It is a figure for demonstrating the top-plate position detection apparatus of the trolley | bogie which concerns on embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 2 is a diagram showing a schematic configuration of an incinerator 1 for PCB-containing waste W, which is an example of a heat treatment furnace. The waste W contains a metal (for example, aluminum) having a melting point of 1000 ° C. or lower. As shown in FIG. 2, the incinerator 1 of the present embodiment includes a carry-in standby chamber 11 where the waste W before the heat treatment waits, a treatment chamber 12 for performing the heat treatment of the waste W, and the waste after the heat treatment. An unloading standby chamber 13 in which W waits is provided. Openable / closable doors 14 are provided between the loading standby chamber 11 and the processing chamber 12 and between the processing chamber 12 and the unloading standby chamber 13. The processing chamber 12 includes a temperature raising unit 12 a that heats the waste W, a temperature holding unit 12 b that holds the temperature of the heated waste W, and a cooling unit 12 c that cools the waste W.

  An exhaust duct 15 is connected to the ceiling portions of the temperature raising unit 12 a and the temperature holding unit 12 b of the processing chamber 12, and the exhaust gas in the processing chamber is sent to an exhaust gas processing apparatus (not shown) through the exhaust duct 15. As described above, the gas in the processing chamber 12 is drawn out of the processing chamber through the exhaust duct 15, so that the entire processing chamber 12 has a negative pressure rather than the atmospheric pressure.

  The movement of the waste W in the furnace is performed by the carriage 30. The movement of the cart 30 in the furnace is performed by a cart extrusion device 40 provided in the carry-in waiting chamber 11 and a cart drawing device 50 provided in the carry-out waiting chamber 13.

  The cart extrusion device 40 functions as a pusher that pushes the cart 30 into the processing chamber 12, and is connected to a cylinder device 41 configured such that the cylinder rod 42 expands and contracts in the vertical direction, and the tip of the cylinder rod 42. A link mechanism 43 including a plurality of links 44. The link mechanism 43 is configured such that the tip of the link mechanism 43 (the end of the link 44 located on the most downstream side of the transport line) moves in the horizontal direction in conjunction with the vertical movement of the cylinder rod 42. An extrusion member 45 that pushes the carriage 30 from the carry-in waiting chamber 11 to the processing chamber 12 is attached to the distal end portion of the link mechanism 43.

  The cart drawing device 50 includes a cylinder device 51 configured such that the cylinder rod 52 expands and contracts up and down, and a link mechanism 53 including a plurality of links 54 connected to the distal end portion of the cylinder rod 52. The link mechanism 53 is configured such that the tip of the link mechanism 53 (the end of the link 54 located on the most upstream side of the transport line) moves in the horizontal direction in conjunction with the vertical movement of the cylinder rod 52. A pull-out member 55 that pulls the cart 30 from the processing chamber 12 to the unloading standby chamber 13 is attached to the distal end portion of the link mechanism 53. The pulling member 55 is formed with a protruding portion 55 a that protrudes upward, and is shaped so as to be caught by the lower surface portion of the carriage 30 when the cylinder rod 52 is extended.

  The cart 30 in the carry-in waiting chamber 11 is conveyed to the processing chamber 12 by being pushed by the pushing member 45 of the cart pushing device 40 while the door 14 is opened. The carriage 30 transported to the processing chamber comes into contact with the carriage 30 already in the processing chamber, and the carriage 30 is further pushed in that state, so that each carriage 30 in the processing chamber 12 corresponds to one carriage downstream in the transport direction. Moving. The cart 30 that has been pushed out of the processing chamber 12 and moved to the unloading standby chamber 13 side is drawn into the unloading standby chamber 13 by the protruding portion 55a of the cart pull-out device 50, and the door 14 is closed. The carriage 30 moves in the incinerator 1 in this way. Further, as shown in FIG. 3, the carriage 30 is carried into the carry-in standby chamber 11 by the entrance traverser 60 and is carried out from the carry-out standby chamber 13 by the exit traverser 61. In FIG. 3, illustration of the cart extrusion device 40 and the cart drawing device 50 is omitted.

  As shown in FIG. 4, the cart 30 includes a wheel 31 fitted to the rail 20 laid on the hearth la, a platform 32 made of steel, and a rectangular refractory material stacked on the platform 32 in three layers. 33 (for example, refractory bricks) and a top plate 34 on which the waste W is placed. The top plate 34 is also formed of a fire resistant material (for example, fire brick).

  4 and 5, a heat insulation blanket 16 is provided on the inner surface of the side wall 1b of the furnace, and a plurality of rectangular heat insulations stacked along the height direction V of the furnace further inside the heat insulation blanket 16. A material 17 (for example, a heat insulating brick) is disposed. Among these heat insulating materials 17, some of the heat insulating materials 17 are different in thickness and width from each other, and the heat insulating material 17 in the portion facing the refractory material 33 of the carriage 30 is zigzag between each refractory material 33. The size is such that a gap is formed. That is, the labyrinth seal structure 80 is configured by the side surface of the carriage 30 and the heat insulating material 17 on the inner surface of the side wall 1b of the furnace.

  A burner 18 is provided on the side wall 1b of the furnace facing the top plate 34 of the carriage 30 as a heating unit for heating the waste W. The burners 18 are provided on the side walls 1b on both sides in the width direction D of the furnace, and each burner 18 is along the traveling direction L of the carriage 30 in the processing chamber 12 as shown in FIG. A plurality are arranged at intervals. In addition, the number of the burners 18 arrange | positioned along the process chamber advancing direction L can be suitably changed according to the furnace length. Moreover, a heating part is not limited to a burner.

  As shown in FIGS. 4 and 5, a gas supply pipe 19 that supplies gas between the platform 32 of the carriage 30 and the hearth 1 a is provided on the side wall 1 b of the furnace below the uneven portion of the labyrinth seal structure 80. Is provided. As shown in FIG. 4, the gas supply pipes 19 are provided on the side walls 1b on both sides in the furnace width direction D, and each gas supply pipe 19 is connected to a gas supply source (not shown). Note that the gas supplied from the gas supply pipe 19 is, for example, air. In this embodiment, a tubular part is used as the gas supply unit, but a part such as a spray nozzle or a shower head may be used. The gas supply part should just have the structure which can supply the gas into a furnace.

  In the conventional incinerator, the pressure in the processing chamber 12 as a whole is a negative pressure rather than the atmospheric pressure, but the pressure in the space above the uneven portion of the labyrinth seal structure 80 in the processing chamber 12 is the pressure in the space below the uneven portion. It was higher than the pressure. On the other hand, in the incinerator 1 of this embodiment, gas is supplied to the space between the platform 32 of the carriage 30 and the hearth 1a during heat treatment. Along with this, the space below the uneven portion of the labyrinth seal structure 80 becomes more positive than the space above the uneven portion, and the atmospheric gas in the space below the uneven portion of the labyrinth seal structure 80 passes through the gap of the labyrinth seal structure 80. It flows from the bottom to the top. For this reason, soot and acid gas generated during the heat treatment of the waste W are less likely to flow through the gaps in the labyrinth seal structure 80, and soot and acid gas are less likely to reach the wheel 31 of the carriage 30. As a result, it becomes possible to suppress the progress of corrosion and wear of the wheel 31 as compared with the conventional case, and it is possible to suppress the occurrence of a conveyance trouble.

  Further, when the waste W contains PCB, a corrosive gas containing chlorine such as hydrogen chloride gas is generated during the heat treatment, but the gas supply pipe 19 such as the incinerator 1 of the present embodiment. If the structure is such that the gas supplied from above flows between the carriage 30 and the inner surface of the side wall 1b of the furnace from below to above, the corrosive gas is unlikely to reach the wheels 31 of the carriage 30. Thereby, the corrosion and wear of the wheel 31 can be suppressed, and the occurrence of the conveyance trouble of the carriage 30 can be suppressed.

  Further, in the continuous heat treatment furnace configured such that the carriage 30 in the processing chamber 12 is moved by being pushed by the subsequent carriage 30 as in the present embodiment, the processing is performed with the carriage 30 on the upstream side in the processing chamber traveling direction L. Since the carriages 30 move in the processing chamber 12 with the carriages 30 on the downstream side in the indoor traveling direction L in contact with each other, the gap between the carriages 30 is small. For this reason, when gas is supplied to the space between the platform 32 and the hearth 1a of each carriage 30, the space can be made to be more positive than the space above the concavo-convex portion of the labyrinth seal structure 80.

  In addition, in the incinerator 1 of this embodiment, the top-plate position detection apparatus 70 which detects the position shift of the top plate 34 of the trolley | bogie 30 is provided in the terminal part of the exit traverser 61, as shown in FIG. The top plate position detecting device 70 includes two line lasers 71. As shown in FIG. 6, the line lasers 71 are spaced slightly larger than the width of the top plate 34, and the laser beam travels in the direction L in the processing chamber. Are arranged in parallel with each other.

  The top plate 34 of the carriage 30 may rotate around the height direction V of the furnace as a rotation axis due to vibrations during movement of the carriage 30, falling objects from the waste W during the incineration process, and the like. If the operation is continued in this state, the positional displacement of the top plate 34 is further enlarged due to thermal expansion or contraction of the top plate 34, and the top plate 34 may be dropped. On the other hand, in the incinerator 1 of the present embodiment, a laser beam is output from the line laser 71 when the cart 30 on which the waste W is loaded is transported to a predetermined position at the end portion of the exit traverser 61. At this time, when the top plate 34 is inclined with respect to the processing chamber traveling direction L, the laser beam of the line laser 71 is blocked as shown in FIG. When the laser beam is blocked, the operator can visually confirm that, so the operator can easily grasp that the top plate 34 is displaced from the appropriate position. The operator corrects the position of the top plate 34 that is displaced from the proper position, and the carriage 30 that has completed the correction of the position displacement of the top plate 34 is loaded again with the waste W and carried into the furnace from the inlet traverser 60. .

  In addition, the installation position of the top plate position detection device 70 and the installation method of the line laser 71 are not limited to those described in the present embodiment. Further, in this embodiment, when the laser beam of the line laser 71 is blocked, the operator visually confirms that. However, for example, when the laser beam is blocked, the control unit is controlled from the line laser 71. A signal may be output to (not shown), and the operator may be notified that the top plate 34 has been displaced by turning on a warning lamp on the operation panel of the incinerator 1 or by an alarm. In the present embodiment, the line laser 71 is exemplified as a component of the top position detector 70, but other sensors or the like may be used as long as the position shift of the top can be detected.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  For example, in the above embodiment, the gas supply pipe 19 is provided on the side wall 1b in the vicinity of the hearth 1a, but the installation position of the gas supply pipe 19 is not limited to this. For example, a gas supply pipe 19 may be provided in the hearth 1a so that the gas blows upward. That is, the heat treatment furnace is configured such that the gas supplied from the gas supply unit (in the above embodiment, the gas supply pipe 19) flows upward from below between the side surface of the carriage 30 and the inner surface of the side wall 1b of the furnace. Then, the progress of corrosion and wear of the wheels 31 of the carriage 30 can be suppressed.

  Moreover, in the said embodiment, although the gas supply pipe | tube 19 was provided in the both sides of the width direction D of a furnace, you may decide to provide only in the one side of the width direction D of a furnace. Even in this case, the gas is continuously supplied to the space between the platform 32 of the carriage 30 and the hearth 1a, so that the space becomes a positive pressure with respect to the space above the uneven portion of the labyrinth seal structure 80. However, supplying gas from both sides of the width direction D of the furnace makes it difficult for soot and acid gas to reach the wheel 31. From the viewpoint of further suppressing the progress of corrosion and wear of the wheel 31, It is preferable to provide the gas supply pipes 19 on both sides in the width direction D.

  Moreover, about the connection part of the gas supply pipe | tube 19 and the side wall 1b of a furnace, the gas supply pipe | tube 19 is provided so that the front-end | tip of the gas supply pipe | tube 19 may protrude inside the process chamber 12 with respect to the inner wall of the side wall 1b of a furnace. A configuration in which the side wall 1b of the furnace is inserted into the processing chamber 12 or a mode in which the gas supply pipe 19 is bent after being inserted into the processing chamber 12 from the side wall 1b of the furnace and the opening portion faces downward is also possible. Good. In the heat treatment furnace in which falling objects from the processed material on the carriage 30 are assumed, the gas supply pipe 19 is inserted into the processing chamber 12 and the opening is directed downward. There is an advantage that it is possible to reduce a risk of trouble that the opening of the gas supply pipe 19 is clogged with falling objects.

  Moreover, in the said embodiment, although the labyrinth seal structure 80 comprised with the heat insulating material 17 of the trolley | bogie 30 side surface and the side wall 1b of a furnace was provided, the labyrinth seal structure 80 does not need to be provided. Even in this case, since the gas is continuously supplied to the space between the base 32 of the carriage 30 and the hearth la, the atmosphere gas flows from the lower space of the carriage 30 to the upper space of the carriage 30. The flow of acid gas into the wheel 31 can be suppressed. That is, in order to enjoy the effect of suppressing the corrosion and wear of the wheel 31, for example, the amount of gas supplied from the gas supply pipe 19 is increased, or the gap between the carriage 30 and the inner wall 1b of the furnace is increased. The heat treatment furnace should just be comprised so that the gas supplied from the gas supply pipe | tube 19 may flow between the trolley | bogie 30 and the side wall 1b inner surface of a furnace toward upper direction from the downward direction by making it small. However, by providing the labyrinth seal structure 80, it is possible to avoid the gas from flowing from the upper side to the lower side and from the lower side to the upper side, and soot and acid gas are difficult to reach the wheel 31, so From the viewpoint of further suppressing the progress of corrosion and wear, it is preferable to provide the labyrinth seal structure 80. It is also preferable to measure and monitor the pressure difference between the upper space and the lower space after providing a labyrinth seal structure 80 to generate a differential pressure between the upper space of the cart 30 and the lower space of the cart 30. is there. If the pressure difference between the upper space and the lower space of the carriage 30 is monitored during the operation of the heat treatment furnace and an alarm is issued when the pressure difference falls below a certain reference value, the pressure is output when the alarm is issued. By investigating the cause of the difference being reduced and taking measures, it is possible to prevent soot and acid gas from flowing into the wheel 31 in advance. In addition, the member which comprises the labyrinth seal structure 80 in the side surface of the trolley | bogie 30 is not limited to the refractory material 33 like the said embodiment, You may comprise the labyrinth seal structure 80 with another member.

  Moreover, in the said embodiment, although the incinerator 1 of a PCB containing waste was illustrated as a heat processing furnace, a heat processing furnace is not limited to this, For example, the furnace which performs other heat processings, such as a carburizing process, may be sufficient.

  The present invention can be applied to incineration of PCB-containing waste.

DESCRIPTION OF SYMBOLS 1 Incinerator 1a Hearth 1b Furnace side wall 11 Carry-in waiting room 12 Processing room 12a Temperature rising part 12b Temperature holding part 12c Cooling part 13 Carrying-out waiting room 14 Door 15 Exhaust duct 16 Heat insulation blanket 17 Heat insulating material 18 Burner 19 Gas supply pipe 20 Rail 30 Bogie 31 Wheel 32 Platform 33 Refractory Material 34 Top Plate 40 Bogie Extrusion Device 41 Cylinder Device 42 Cylinder Rod 43 Link Mechanism 44 Link 45 Pushing Member 50 Bogie Pulling Device 51 Cylinder Device 52 Cylinder Rod 53 Link Mechanism 54 Link 55 Pulling Member 55a Projection part 60 of extraction member Inlet traverser 61 Outlet traverser 70 Top plate position detector 71 Line laser 80 Labyrinth seal structure D Furnace width direction L Processing chamber traveling direction V Furnace height direction W Waste

Claims (8)

It is a cart-conveying heat treatment furnace that conveys the processed material with a cart,
A heating unit for heating the processed object placed on the carriage,
A gas supply unit provided below the heating unit for supplying gas into the furnace;
The heat processing furnace comprised so that the gas supplied from the said gas supply part may flow upwards from the downward direction between the said trolley | bogie and the side wall inner surface of a furnace.   The heat treatment furnace according to claim 1, wherein the gas supply unit is provided on side walls on both sides in the width direction of the furnace.   The heat treatment furnace according to claim 1 or 2, wherein the treated product is a PCB-containing waste, and is configured to incinerate the PCB-containing waste.   The heat treatment furnace according to any one of claims 1 to 3, wherein a labyrinth seal structure is provided between a side surface of the carriage and an inner surface of a side wall of the furnace. A heat treatment method for carrying out a heat treatment of a processed product by conveying the processed product with a carriage,
When performing the heat treatment, gas is supplied from below the heating unit that heats the processing object placed on the cart so that gas flows from below to above between the cart and the inner wall of the furnace. A heat treatment method to be performed.   The heat treatment method according to claim 5, wherein the gas supply is performed from side walls on both sides in the width direction of the furnace.   The heat treatment method according to claim 5 or 6, wherein the treated product is a PCB-containing waste, and the PCB-containing waste is incinerated.   The heat processing method as described in any one of Claims 5-7 which implements the said heat processing in the heat processing furnace which provided the labyrinth seal structure between the side surface of the said trolley | bogie, and the side wall inner surface of a furnace.

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