WO2011052495A1 - Rotary heat treatment apparatus - Google Patents

Abstract

Provided is a rotary heat treatment apparatus which can prevent tar or the like from adhering to a sealed portion or a screw casing due to the temperature reducing within a furnace. A screw conveyor (20) for passing an object to be treated which has been inputted from an inlet-side casing and for transferring the object to be treated into a cylindrical heating furnace (10) is installed at an end portion of the cylindrical furnace (10) which heat-treats the object to be treated and an external casing (22) covers the screw conveyor (20). The ends of a pair of gas supply tubes (28A, 28B) are coupled proximal to the base end-side portion of the external casing (22), so that the pair of gas supply tubes (28A, 28B) are connected. Heated inert gas is supplied from the pair of gas supply tubes (28A, 28B) to a space (S) defined between the external casing (22) and an internal casing (24).

Description

Rotary heat treatment equipment

The present invention relates to a rotary heat treatment apparatus for heat-treating an object to be processed, and is suitable for a horizontal rotary incinerator such as a rotary kiln or a carbonization furnace.

In rotary heat treatment devices such as rotary kilns and other horizontal rotary incinerators and dryers, especially when processing objects that generate flammable gases during heating, or objects that are highly ignitable In order to ensure safety during operation, leakage of internal gas from the rotary heat treatment apparatus and inflow of outside air into the rotary heat treatment apparatus must be prevented.

Therefore, in order to prevent the internal gas present in the furnace in the rotary heat treatment apparatus from leaking to the outside and to prevent the outside air from flowing into the apparatus, a plurality of seal portions have been installed. Further, in order to protect these seal portions, a technique is known in which a cooled inert gas is sealed in a space partitioned by the plurality of seal portions. For example, what is shown in Patent Document 1 below is a method of performing a gas purge with this inert gas, which not only prevents leakage of internal gas but also serves to block outside air (oxygen), and this inert gas bears Yes.

JP 2008-256287 A Japanese Patent Laid-Open No. 10-96509 Japanese Patent Laid-Open No. 10-206021 Japanese Patent Laid-Open No. 10-300388 Japanese Patent Laid-Open No. 2-113088

However, when components such as tar that increase in viscosity due to temperature drop or components that are condensed and corrosive to metals are contained in the internal gas, the cooled inert gas is partitioned by multiple seals. As it was sealed in the space, the tar component or the like was cooled and fixed to the seal portion, or the seal portion or the furnace body could be corroded. On the other hand, when an inert gas cooled to a low temperature is supplied into a space partitioned by a plurality of seal portions, tar components and the like are cooled and fixed to a screw conveyor or the like as the internal gas temperature decreases. There was also a risk of corrosion of the furnace body and the like.

In view of the above facts, the present invention has an object to provide a rotary heat treatment apparatus capable of preventing the internal gas temperature from decreasing and preventing organic substances from adhering to or being corroded on a seal portion or a screw conveyor. To do.

The rotary heat treatment apparatus according to claim 1 includes an outer casing partly fitted to one end of a furnace main body for heat-treating a workpiece,
A screw conveyor that is disposed on the inner peripheral side of the outer casing and conveys the workpiece;
A gas supply pipe connected to the outer casing and supplying heated gas to a space between the outer casing and the screw conveyor;
From the space between the outer casing and the screw conveyor, the gas supplied from the gas supply pipe is provided between the furnace body, the fixed casing disposed at one end of the furnace body, and the furnace body and the fixed casing. A gas discharge port for discharging into a sealed space outside the outer casing surrounded by the sealing material;
It is characterized by providing.

The operation of the rotary heat treatment apparatus according to claim 1 will be described below.
In the rotary heat treatment apparatus according to the present invention, a part of the outer casing is fitted to one end portion of the furnace body for heat-treating the object to be processed, and the screw conveyor for conveying the object to be processed is provided on the inner peripheral side of the outer casing. Is arranged. Furthermore, the gas supply pipe connected to the outer casing not only supplies the heated gas to the space between the outer casing and the screw conveyor, but also the gas discharge port from this space, the furnace body and the furnace body. The gas is discharged into a sealed space outside the outer casing surrounded by a fixed casing disposed at one end and a sealing material provided between the furnace body and the fixed casing.

Therefore, instead of the cooled inert gas, the heated gas is supplied to the space between the outer casing and the screw conveyor by the gas supply pipe, and the heat of the heated gas causes the inside of the screw conveyor. The temperature and the temperature in the furnace main body to which this screw conveyor is connected are unlikely to decrease. Along with this, even when the object to be processed is heated in the screw conveyor and the organic substance etc. is gasified from within the object to be processed, the organic substance etc. is not cooled by the heat of the heated gas, Liquefaction of gasification component is prevented.

Furthermore, as the heated gas is supplied to the sealed space outside the outer casing sealed by the sealing material via the gas discharge port, the possibility of tar and the like sticking to the seal portion is reduced. Further, the sealed space is pressurized with gas, so that the in-furnace gas, dust, and tar components can be prevented from entering the sealed space.

As a result, according to the rotary heat treatment apparatus of the present claim, since the gasification component or the like is not cooled, there is no possibility that tar or the like adheres to the seal portion on the outer peripheral side of the outer casing or the vicinity of the screw conveyor. Along with this, it becomes possible to preheat the object to be processed before being fed into the furnace body with gas in the screw conveyor.

The operation of the rotary heat treatment apparatus according to claim 2 will be described below.
The rotary heat treatment apparatus according to the present invention has the same effect as that of the first aspect. However, the present invention has a configuration in which the temperature of the gas supplied by the gas supply pipe is higher than the temperature inside the furnace or the screw conveyor.

That is, according to this claim, the temperature of the gas supplied from the gas supply pipe is higher than the temperature in the screw conveyor connected to one end of the furnace body and heated by the heat in the furnace body. , The risk of tar and the like sticking is reliably eliminated.

The operation of the rotary heat treatment apparatus according to claim 3 will be described below.
The rotary heat treatment apparatus according to the present invention has the same effects as those of the first and second aspects. However, the present invention has a configuration in which the gas is an inert gas.

That is, according to this claim, by supplying an inert gas, liquefaction and condensation of gasification components can be prevented without supplying oxygen into the furnace. In particular, when combustible gas is generated in the furnace, it is possible to prevent ignition.

The operation of the rotary heat treatment apparatus according to claim 4 will be described below.
The rotary heat treatment apparatus according to the present invention has the same effects as those of the first to third aspects. However, the present invention has a configuration in which a plurality of gas supply pipes are installed in the outer casing.

In other words, according to the present claim, the inert gas, which is a gas heated from a plurality of gas supply pipes installed in the outer casing, is fed into the space between the outer casing and the screw conveyor. Inert gas is dispersed and supplied. As a result, the object to be processed being conveyed by the screw conveyor can be heated more uniformly.

The operation of the rotary heat treatment apparatus according to claim 5 will be described below.
The rotary heat treatment apparatus according to the present invention has the same effects as those of the first to fourth aspects. However, the present invention has a configuration in which the gas discharge port is formed in a portion of the outer casing which is on the downstream side in the gas flow direction.

That is, according to this claim, the inert gas which is the heated gas is supplied to the space between the outer casing and the screw conveyor, so that the inert gas flows in the space between them. By forming a gas discharge port in the portion of the outer casing that is downstream of the flow direction of the inert gas, the inert gas enters the sealed space outside the outer casing sealed by the sealing material from the gas discharge port. Is discharged. As a result, as the inside of the screw conveyor can be heated uniformly by the flowing inert gas, preheating of the object to be processed in the screw conveyor is also promoted.

The operation of the rotary heat treatment apparatus according to claim 6 will be described below.
The rotary heat treatment apparatus according to the present invention has the same effects as those of the first to fifth aspects. However, the present invention has a configuration in which a second sealing material for sealing a space between the furnace main body and the outer casing on the furnace inner side from the gas discharge port is provided.
That is, according to this claim, the sealed space is closed to a certain extent between the sealing material that seals the fixed casing and the furnace body and the second sealing material. By providing a gas discharge port corresponding to this sealed space, the sealed space can be filled with gas, and invasion of furnace gas can be prevented.

A rotary heat treatment apparatus according to a seventh aspect of the present invention includes a screw conveyor that is disposed at one end of a furnace body that heat-treats a workpiece and conveys the workpiece.
A cylindrical outer casing that is disposed on the outer periphery side of the screw conveyor while extending through the first passage that is a space, and extends to the furnace body side end of the screw conveyor;
A gas supply pipe connected to the outer casing and supplying heated gas into the first passage;
A cylindrical hot air tube that is disposed on the outer peripheral side of the outer casing while extending through the second passage that is a space, and extends to the end of the screw conveyor on the furnace body side;
The first passage and the second passage are communicated by closing so as to connect between the end of the screw conveyor on the furnace body side and the one end of the hot air tube while having a gap between the one end of the outer casing. A lid material to be
It is characterized by providing.

The operation of the rotary heat treatment apparatus according to claim 7 will be described below.
In the rotary heat treatment apparatus according to the present invention, a screw conveyor is disposed at one end portion of the furnace body for heat-treating the workpiece, and the screw conveyor conveys the workpiece. In addition, a cylindrical outer casing disposed on the outer periphery side of the screw conveyor through the first passage defined as a space extends to the furnace body side end of the screw conveyor, and via a second passage defined as a space. On the other hand, the cylindrical hot-air cylinder arrange | positioned at the outer peripheral side of an outer casing is extended even to the furnace main body side edge part of a screw conveyor.

Furthermore, not only is the gas supply pipe connected to the outer casing, but also there is a gap between the outer casing and one end of the outer casing, and the gap between the end of the screw conveyor on the furnace body side and one end of the hot air tube. The lid member is closed so as to be connected, and the first passage and the second passage are communicated with each other.

Therefore, instead of the cooled inert gas, heated gas is supplied into the first passage from the gas supply pipe connected to the outer casing, so that the temperature in the screw conveyor is heated by the heat of the heated gas. In addition, the temperature inside the furnace body to which the screw conveyor is connected is unlikely to decrease. Along with this, even when the object to be processed is heated in the screw conveyor and the organic substance etc. is gasified from the inside of the object to be processed, the organic substance etc. will not be cooled by the heat of the heated gas. The liquefaction of the gasification component is prevented.

On the other hand, the gas flows not only in the first passage between the screw conveyor and the outer casing, but also in the second passage between the hot air ducts arranged so as to cover the outer periphery of the outer casing. Will flow along. For this reason, when the seal part located outside the hot air tube is heated by this gas, the possibility that tar or the like adheres to the seal part is reduced.

And, since the cylindrical hot-air cylinder is arranged so as to cover the outer periphery of the outer casing, the gas flows to the tip of the outer casing, and the surface of the outer casing can be set to the internal gas temperature or higher. This prevents tar from adhering to the tip portion of the outer casing and realizes stable operation of the rotary heat treatment apparatus.

As a result, according to the rotary heat treatment apparatus of the present claim, since gasification components and the like are not cooled, there is no possibility that tar or the like adheres to the seal portion on the outer peripheral side of the hot air tube or the vicinity of the screw conveyor. Along with this, it becomes possible to preheat the object to be processed before being fed into the furnace body with gas in the screw conveyor.

The operation of the rotary heat treatment apparatus according to claim 8 will be described below.
The rotary heat treatment apparatus according to the present invention has the same effect as that of the seventh aspect. However, in this claim, these spaces are spiraled in the first passage, which is a space between the screw conveyor and the outer casing, and in the second passage, which is a space between the outer casing and the hot air tube. It has a configuration in which guide vanes that are partitioned into shapes are formed.

That is, according to this claim, the guide vanes are not only in the first passage that is a space between the screw conveyor and the outer casing, but also in the second passage that is a space between the outer casing and the hot air tube. Each inside is partitioned into a spiral. For this reason, a swirl flow is generated in the gas flowing between them, and the heat of the gas is more efficiently transferred. The gas is heated more uniformly by this gas, and the temperature in the screw conveyor and the periphery of the seal member can be made more uniform.

The operation of the rotary heat treatment apparatus according to claim 9 will be described below.
The rotary heat treatment apparatus according to the present invention has the same effects as those of the seventh and eighth aspects. However, in the present claim, the sealed space sealed by a plurality of sealing materials exists on the outer peripheral side of the hot air tube, and the discharge port for releasing the gas after passing through the second passage into the sealed space is the end of the hot air tube. It has the structure of being provided in.

That is, according to the present invention, the discharge port for releasing the gas after passing through the second passage is provided at the end of the hot air tube, and is present on the outer peripheral side of the hot air tube and is sealed by the sealing material. The gas is discharged from the discharge port into the sealed space. As a result, the sealed space is pressurized with gas, so that the pressure inside the furnace becomes higher than the pressure inside the furnace, and it is possible not only to prevent the in-furnace gas, dust and tar components from entering the sealed space, but also the seal. The possibility of tar and the like sticking to the part is further reduced.

As described above, according to the present invention, it is possible to provide a rotary heat treatment apparatus that can prevent organic substances and the like from adhering to a seal portion or a screw conveyor due to a decrease in the temperature of internal gas.

It is a schematic diagram of the rotary heat processing apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the introduction part periphery of the rotary heat processing apparatus which concerns on the 1st Embodiment of this invention. It is a side view which shows the introduction part periphery of the rotary heat processing apparatus which concerns on the 1st Embodiment of this invention. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is a principal part expanded sectional view of the rotary heat processing apparatus which concerns on the 1st Embodiment of this invention. FIG. 2 is an enlarged view showing a relationship between an outer casing and an inner casing applied to the rotary heat treatment apparatus according to the first embodiment of the present invention, where (A) is a side view and (B) is an arrow BB. FIG. It is sectional drawing which shows the introduction part periphery of the rotary heat processing apparatus which concerns on the 2nd Embodiment of this invention. It is CC sectional view taken on the line of FIG. It is a principal part expanded sectional view of the rotary heat processing apparatus which concerns on the 2nd Embodiment of this invention.

A first embodiment of a rotary heat treatment apparatus according to the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic diagram of a rotary heat treatment apparatus 1 according to the present embodiment. The rotary heat treatment apparatus 1 is for heat-treating an object to be treated, and a cylindrical heating furnace 10 that is a cylinder that is opened and rotated at both ends and heat-treats the object to be treated is a furnace body. ing. Fits into fixed casings (an inlet side casing 12 for supplying the object to be processed into the furnace and an outlet side casing 13 for discharging the object to be processed from the furnace) respectively installed on both ends of the cylindrical heating furnace 10. The cylindrical heating furnace 10 is installed so as to be worn. Further, a pair of seal mechanisms 14 are installed at a connection portion between the inlet side casing 12 and the outlet side casing 13 and the cylindrical heating furnace 10.

As described above, the rotary heat treatment apparatus 1 is mainly configured by the cylindrical heating furnace 10, the inlet side casing 12, the outlet side casing 13, and the pair of seal mechanisms 14. A pair of tires 15 are provided around the outer peripheral wall of the cylindrical heating furnace 10, and a pair of rollers 16 are installed below the pair of tires 15 so as to contact the pair of tires 15, respectively. Has been.

Therefore, the cylindrical heating furnace 10 is rotatable about the axial direction as a rotation axis, and the tire 15 rotates as the cylindrical heating furnace 10 is rotated by a driving source such as a motor (not shown). Thus, the pair of rollers 16 rotates around the axial direction of the cylindrical heating furnace 10.

As shown in FIG. 1, an outer cylinder 11 for heating the cylindrical heating furnace 10 from the outside is provided on the outer peripheral side of the cylindrical heating furnace 10, and between the heating furnace 10 and the outer cylinder 11. As the cylindrical heating furnace 10 is heated by a heating medium (not shown) supplied to the space (for example, high-temperature gas, steam, etc.), the object to be processed accommodated in the cylindrical heating furnace 10 is heated. It has become so.

On the other hand, the inlet-side casing 12 includes a supply port (not shown) for a workpiece to be communicated with one end of the cylindrical heating furnace 10, and the outlet-side casing 13 communicates with the other end of the cylindrical heating furnace 10. A discharge port (not shown) for a workpiece is provided. For this reason, the object to be processed is supplied into the inlet side casing 12 from the supply port, heated in the cylindrical heating furnace 10, transferred into the outlet side casing 13, and finally discharged from the discharge port. become.

Further, in this embodiment, the internal gas is extracted so as to counterflow with respect to the conveyance direction of the workpiece, and the internal gas is supplied from the outlet side casing 13 and discharged from the inlet casing 12. Is done. In addition, the gas flow in the furnace is not limited to the counter flow, and may be the same co-current as the conveyance direction of the workpiece.

As shown in FIGS. 2 to 5, a screw conveyor for supplying an object to be processed into the cylindrical heating furnace 10 is provided at one end of a cylindrical heating furnace 10 which is a furnace body for heating the object to be processed. The outer casing 22 made of metal and formed in a cylindrical shape covers the screw conveyor 20.

As shown in FIGS. 2 and 5, a heating wire 42 for heating the outer casing 22 is wound around the outer peripheral side central portion of the outer casing 22. Further, a heat insulating member 44 is wound around the outer peripheral side of the heating wire 42. An expansion joint 48 is disposed in a portion adjacent to the heat insulating member 44 via a partition plate 46 formed in a flange shape. A connecting plate 50 formed in a shape is arranged.

The flange plate 52 is provided on the cylindrical heating furnace 10 side of the connecting plate 50 so as to protrude from the end of the cylindrical heating furnace 10 to the outer peripheral side. An annular sealing material 50 </ b> A made of metal or carbon material is installed on the surface of the connecting plate 50 facing the flange plate 52. Further, an annular sealing material 52A made of metal is provided on the surface of the flange plate 52 facing the connecting plate 50.

On the other hand, a plurality of air cylinders 54 are annularly arranged between the inlet side casing 12 and the connecting plate 50, and the connecting plates 50 are pressed against the flange plate 52 side by the force of the plurality of air cylinders 54. Thus, the sealing material 50A is pressed against the sealing material 52A. Since these are in strong contact with each other, a mechanical seal at this portion is achieved. In place of the air cylinder 54, an electric cylinder, a hydraulic cylinder, or a spring may be used.

At the end of the cylindrical heating furnace 10, the base end side of the lip seal or ring 56 for closing the gap between the inner peripheral surface of the cylindrical heating furnace 10 and the outer peripheral surface of the outer casing 22 is provided. It is attached over the circumference between the surfaces. Therefore, the sealed space H formed on the outer peripheral side of the outer casing 22 is sealed with the first sealing material composed of the sealing material 50A and the sealing material 52A, and the second sealing material composed of the lip seal 56 and the like. Accordingly, these constitute the sealing mechanism 14 of the inlet casing 12.

The screw conveyor 20 is composed of a metal screw casing 24 having a U-shaped cross section and formed in a straight line, and a screw shaft 26. On the cross section shown in FIG. The upper end portions on both sides are fixed to the inner surface side of the outer casing 22 by welding or the like. Further, the central portion of the screw casing 24 is in contact with the inner surface side of the outer casing 22. Thus, the screw casing 24 is disposed while being fixed to the inner peripheral side of the outer casing 22 so that the screw casing 24 extends in parallel to the outer casing 22.

On the other hand, the screw shaft 26 has an axial shape having a convex portion 26 </ b> A for conveyance on the outer peripheral surface, and is arranged in the screw casing 24. The screw shaft 26 is rotated by a motor or the like which is a driving source (not shown), so that the workpiece is conveyed to the cylindrical heating furnace 10 side while rotating. Here, it is also possible to adopt a screw shaft having only a ribbon-like screw and having no shaft.

On the other hand, one end of a pair of gas supply pipes 28A and 28B is connected to a symmetrical position near the base end side and near the lower part of the transverse section of the outer casing 22, and thus the outer casing 22 is connected to each other. A pair of gas supply pipes 28A and 28B are connected to the left and right lower portions of the two. The heated gas is supplied from the pair of gas supply pipes 28 </ b> A and 28 </ b> B to the space S shown in FIG. 4, which is a gap between the outer casing 22 and the inner casing 24. Specifically, the pair of gas supply pipes 28A and 28B are installed with respect to the outer casing 22 in a state where the gas supply pipes 28A and 28B are inclined at a fixed angle (for example, 22.5 degrees) α with respect to the horizontal line L. Has been.

By adopting such a structure, preheating of the workpiece before being fed into the cylindrical heating furnace 10 as the furnace body can be promoted as the bottom surface of the screw conveyor 20 is positively heated. It also becomes. Furthermore, when moisture in the supplied gas is condensed when the operation is stopped, the gas can be discharged from the space S. The supply pipes are not limited to a pair, and may be one or a pair or more depending on the gas supply amount. Further, the installation position of the gas supply pipe is not limited to a state inclined downward.

In addition, the kind of gas supplied by the pair of gas supply pipes 28A and 28B at this time can be appropriately selected according to the properties of the object to be processed, but an inert gas such as nitrogen or water vapor is preferable. Further, the temperature of the inert gas is set higher than the temperature in the screw casing 24 and the temperature in the cylindrical heating furnace 10. For example, when the furnace temperature is about 350 ° C., the temperature of the inert gas is 400 to 450 ° C. It is at temperature.

Here, as the inert gas, a gas obtained by heating the internal gas discharged from the cylindrical heating furnace 10 can be used. As an example, as shown in FIG. 1, when the internal gas is flowing in the direction of arrow A in the cylindrical heating furnace 10, the reburning furnace 19A for combustion treatment and the exhaust for removing dust and the like in the internal gas are shown. The internal gas can be discharged from the chimney 19C via the smoke treatment tower 19B. At this time, a pipe is connected in the middle of the path of the internal gas from the inlet side casing 12, and the internal gas is blown by the blower 17. It is possible to attract.

Then, the internal gas that has been attracted to remove dust and the like in the gas in the smoke treatment tower 19B is burned by the heating device 18 such as a burner and supplied to the gas supply pipes 28A and 28B. In particular, when the internal gas is a combustible gas, the internal gas can be effectively used as a heated fuel and an inert gas by using the heating device 18 as a combustion device such as a burner. In addition, what is necessary is just to utilize the internal gas discharged | emitted from the outlet side casing 13 when internal gas is a parallel flow.

Furthermore, when the heating furnace is an external heating kiln, the heating gas after heating the heating furnace may be reheated by the heating device 18 and used. That is, by reusing exhaust heat, a heat source can be secured without providing new equipment. In addition, when the heat source of the heating device and the internal gas are not used, it is possible to appropriately supply the gas by receiving a gas supply from a separate storage tank or the like.

On the other hand, the inert gas supplied from the gas supply pipes 28A and 28B is placed on the left and right portions of the outer casing 22 near the cylindrical heating furnace 10 which are the downstream portion of the outer casing 22 in the flow direction of the inert gas. Gas discharge ports 30 </ b> A and 30 </ b> B for discharging from the space S between the outer casing 22 and the screw casing 24 are formed. That is, the inert gas is supplied into the space S so that the flow of the inert gas and the gas flow flowing from the cylindrical heating furnace 10 side are countercurrent, and the two gas discharge ports 30A and 30B In order to discharge the inert gas, as shown in FIG.

Specifically, the left gas discharge port 30A in FIG. 6B is in a range of an angle of about 90 degrees from the position of the center line X to the lower end of the outer casing 22, and is rectangular with a predetermined width. It is made into a shape. Further, the right gas outlet 30B in FIG. 6B is notched upward from the position of the center line X of the outer casing 22, and has a rectangular shape with a predetermined width.

Next, the operation of the rotary heat treatment apparatus 1 according to the present embodiment will be described below.
In the rotary heat treatment apparatus 1 of the present embodiment, an outer casing 22 is disposed at one end of a cylindrical heating furnace 10 that heat-treats a workpiece. Further, a screw conveyor 20 for conveying the object to be processed introduced from the inlet side casing (not shown) into the cylindrical heating furnace 10 is provided with a space S on the inner peripheral side of the outer casing 22 through the space S. Have been placed. That is, a space S that allows gas to pass is present between the screw shaft 26 and the outer casing 22.

Further, a plurality of gas supply pipes 28 </ b> A and 28 </ b> B connected to the lower portion of the outer casing 22 supply the inert gas whose temperature is higher than the temperature in the inner casing 24 to the space S. Yes. As a result, the inert gas flows through the space S. Here, it is preferable to use nitrogen, water vapor or the like as the inert gas. Note that the number of gas supply pipes is not limited to a plurality and may be one. Further, the gas discharge ports 30A and 30B are configured to discharge the inert gas from the space between the outer casing 22 and the screw conveyor 20 into the space H outside the outer casing 22 sealed with the sealing material. .

Accordingly, the heated inert gas is supplied from the gas supply pipes 28A and 28B to the space S between the outer casing 22 and the screw casing 24 of the screw conveyor 20, so that the temperature in the inner casing 24 and the screw conveyor 20 are increased. It becomes difficult for the temperature in the cylindrical heating furnace 10 to be connected to decrease. Along with this, even when the object to be processed is heated in the heating furnace 10 and the screw casing 24 and an organic substance or the like is gasified from the object to be processed, the gasified state is maintained by the heat of the heated inert gas. Therefore, liquefaction of the gasification component is prevented.

Further, the heated inert gas is supplied to the sealed space H outside the outer casing 22 sealed by the sealing material via the gas discharge ports 30A and 30B, so that tar or the like is fixed to the seal portion. There is less fear. Furthermore, since this sealed space H is maintained at a pressure higher than the furnace pressure by the inert gas, it is possible to prevent the furnace gas, dust and tar components from entering the space.

As a result, according to the rotary heat treatment apparatus 1 of the present embodiment, since the gasified organic component or the like is not cooled, the gasification is performed on the seal portion on the outer peripheral side of the outer casing 22, the screw casing 24, or the like. There is no risk of sticking of organic components and the like. Along with this, it becomes possible to preheat the workpiece before being fed into the cylindrical heating furnace 10 with this inert gas in the screw casing 24.

On the other hand, according to the present embodiment, as the temperature of the inert gas is higher than the temperature in the screw conveyor 20 heated by the heat in the cylindrical heating furnace 10, the gasified organic The risk of sticking of components and the like is surely eliminated.

Furthermore, according to the present embodiment, the inert gas heated from the two gas supply pipes 28A and 28B, which are installed at a location near the lower portion of the outer casing 22, is sent to the outer casing 22 respectively. The heated inert gas is distributed and supplied to the space S between the screw casing 24 and the screw casing 24. As a result, the object to be processed being conveyed by the screw shaft 26 can be heated more uniformly. In addition, as the inert gas is sent from a location near the lower portion of the outer casing 22 and the bottom surface of the screw casing 24 is positively heated, the object to be processed before being sent to the cylindrical heating furnace 10. It becomes possible to promote preheating of the steel.

On the other hand, in the rotary heat treatment apparatus 1 according to the present embodiment, the inert gas supplied from the gas supply pipes 28A and 28B is extracted from the space S between the outer casing 22 and the screw casing 24 to the outside of the outer casing 22. Gas discharge ports 30A and 30B are formed in a portion of the outer casing 22 on the downstream side in the flow direction of the inert gas.

From this, the inert gas that has passed through the space S between the outer casing 22 and the screw casing 24 is discharged into the sealed space H outside the outer casing 22 from these two gas discharge ports 30A and 30B. become. As a result, as the inside of the screw casing 24 can be heated evenly by the flowing inert gas, the preheating of the workpiece in the screw casing 24 is promoted.

Next, a second embodiment of the rotary heat treatment apparatus according to the present invention will be described below with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member demonstrated in 1st Embodiment, and the overlapping description is abbreviate | omitted.
The rotary heat treatment apparatus 1 according to the present embodiment has substantially the same structure as that of the first embodiment, and includes a seal mechanism 14, an outer casing 22, a screw shaft 26, gas supply pipes 28A and 28B, and the like. Have as well.

However, in this embodiment, as shown in FIGS. 7 to 9, the screw casing 32 of the screw conveyor 20 existing on the inner peripheral side of the outer casing 22 has a U-shaped cross section and is formed in a straight line. Unlike the screw casing 24 of the first embodiment, the screw casing 24 is made of metal and has a cylindrical shape. Further, the outer casing 22 has a structure in which a hot air pipe 34 having a larger diameter than the outer casing 22 and disposed coaxially with the outer casing 22 is disposed on the outer peripheral side of the outer casing 22. However, the gas discharge ports 30A and 30B do not exist in the outer casing 22 of the present embodiment.

Further, as shown in FIG. 9, spiral guide blades 36 </ b> A and 36 </ b> B are formed between the screw casing 32 and the outer casing 22 and between the outer casing 22 and the hot air cylinder 34. ing. Further, guide blades 36A and 36B each form a spiral space in a cylindrical space existing between them.

And the screw heating furnace 10 side end portion of the screw casing 32 and the hot air tube 34 among them is sealed so that a lid member 38 is connected between them. Moreover, the cylindrical heating furnace 10 side end part of the outer casing 22 is formed slightly shorter than these, and a communication gap RS is provided between the lid member 38 and the cylindrical heating furnace 10 side end part of the outer casing 22. It has been.

Moreover, although the left end side part in FIG. 9 of the screw casing 32 and the outer casing 22 has reached the same position mutually, the hot air pipe | tube 34 is shortened rather than these, and seals the inert gas after passing a channel | path. By providing the discharge port 40 that discharges into the space H at the end of the hot air tube 34, the space between the outer casing 22 and the hot air tube 34 is opened in the sealed space H.

As described above, the cylindrical space on the inner peripheral side is partitioned spirally by the guide vanes 36A to form the first passage PA1, and the cylindrical space on the outer peripheral side is spirally partitioned by the guide blades 36B. A second passage PA2 is formed. And these 1st channel | path PA1 and 2nd channel | path PA2 are connected by the clearance gap RS for communication, and these channel | paths PA1 and PA2 are finally connected to the blockade space H.

Therefore, in the present embodiment, the inert gas supplied from the pair of gas supply pipes 28A and 28B is supplied into the first passage PA1. The inert gas flows spirally in the first passage PA1, and then turns back to spirally flow in the second passage PA2, so that the inert gas is finally released into the sealed space H. Become.

Next, the operation of the rotary heat treatment apparatus 1 according to the present embodiment will be described below.
In the rotary heat treatment apparatus 1 according to the present embodiment, a cylindrical heating furnace is configured such that a processing object introduced from an inlet-side casing (not shown) is passed through one end of a cylindrical heating furnace 10 that heats the processing object. There is an introduction for feeding into 10. And the screw conveyor 20 is arrange | positioned at this one end part in the form which comprises this introduction part. Furthermore, since the screw conveyor 20 is configured in such a manner that the screw shaft 26 that conveys the workpiece while rotating is disposed in the screw casing 32, the screw conveyor 20 seems to convey the workpiece. become.

Further, the cylindrical outer casing 22 disposed on the outer peripheral side of the screw conveyor 20 extends to the cylindrical heating furnace 10 side end portion of the screw conveyor 20 through the first passage PA1 which is a space. Furthermore, a cylindrical hot air tube 34 arranged on the outer peripheral side of the outer casing 22 extends to the cylindrical heating furnace 10 side end portion of the screw conveyor 20 through the second passage PA <b> 2 that is a space.

The guide vanes 36A are spirally partitioned in the space between the screw casing 32 and the outer casing 22 to form a first passage PA1 through which the inert gas passes. A hot air cylinder 34 is also arranged on the outer peripheral side of the outer casing 22, and the guide vane 36B spirally divides the space between the outer casing 22 and the hot air cylinder 34 to form a second passage PA2. Yes.

Further, not only the gas supply pipes 28 </ b> A and 28 </ b> B are connected to the outer casing 22, but also the end of the screw conveyor 20 on the cylindrical heating furnace 10 side with a gap between the outer casing 22 and one end thereof. The first air passage PA1 and the second air passage PA2 are communicated with each other by closing the cover 38 so that the one end of the hot air tube 34 is connected. Moreover, in this Embodiment, the inert gas after passing 2nd channel | path PA2 is discharge | released in the sealing space H in connection with the sealing space H sealed with the sealing material existing in the outer peripheral side of the hot wind pipe 34. A discharge port 40 is provided at the end of the hot air tube 34.

Therefore, according to the present embodiment, in addition to the same effect as the first embodiment, the heated inert gas flows spirally along the passages PA1 and PA2, thereby heating the inert gas. The temperature in the screw conveyor 20 and the temperature in the cylindrical heating furnace 10 to which the screw conveyor 20 is connected are hardly lowered by the heat of the gas.
Accordingly, even when the object to be processed is heated in the screw conveyor 20 and the organic substance or the like is gasified from the object to be processed, the organic substance or the like is not cooled by the heat of the heated inert gas. As a result, liquefaction of the gasification component is prevented.

On the other hand, the inert gas not only flows in the first passage PA1 between the screw conveyor 20 and the outer casing 22, but also between the hot air cylinders 34 arranged so as to cover the outer periphery of the outer casing 22. It flows along the outer periphery of the outer casing 22 in the passage PA2. For this reason, when the seal part located outside the hot air cylinder 34 is heated by the inert gas, there is less possibility that tar or the like adheres to the seal part.

And since the cylindrical hot-air pipe | tube 34 is arrange | positioned so that the outer periphery of the outer casing 22 may be covered, as the inert gas flows to the front-end | tip of the outer casing 22, the surface of the outer casing 22 is made more than carbonization temperature. can do. Thereby, tar adhesion to the tip portion of the outer casing 22 is also prevented, and stable operation of the rotary heat treatment apparatus 1 is realized.

As a result, according to the rotary heat treatment apparatus 1 of the present embodiment, since gasification components and the like are not cooled, tar or the like adheres to the seal portion on the outer peripheral side of the hot air tube 34 or the vicinity of the screw conveyor 20. No fear. Along with this, it becomes possible to preheat the workpiece before being fed into the cylindrical heating furnace 10 with an inert gas in the screw conveyor 20. Furthermore, according to the rotary heat treatment apparatus 1 of the present embodiment, not only the fixation of tar and the like, but also the case where moisture and corrosive substances in the gas condense and the seal portion is corroded. The phenomenon can also be prevented.

On the other hand, according to the present embodiment, the discharge port 40 that discharges the inert gas after passing through the passage is provided at the end of the hot air cylinder 34 located on the outermost side, The inert gas is discharged from the discharge port 40 into the sealed space H that is present and sealed with the sealing material.

Therefore, the sealed space H is pressurized by the inert gas, so that not only the in-furnace gas, dust and tar components can be prevented from entering the sealed space H, but also the tar is formed in the seal portion. The risk of sticking or the like is further reduced.

As a result of the above, according to the rotary heat treatment apparatus 1 of the present embodiment, as the swirl flow is generated in the inert gas, the inert gas is uniformly heated, and the screw conveyor 20 and the seal are sealed. The temperature around the member can be made uniform so that tar components and the like are not inadvertently cooled. For this reason, there is no possibility that tar or the like adheres to the seal portion on the outer peripheral side of the hot air tube 34 or the vicinity of the screw conveyor 20. Along with this, it becomes possible to preheat the workpiece before being fed into the cylindrical heating furnace 10 with this inert gas in the screw conveyor 20.

The embodiment according to the present invention has been described above, but the present invention is not limited to the embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the inert gas is most preferably nitrogen, but other inert gases such as heated steam, carbon dioxide, and combustion exhaust gas may be used depending on the processed material. In addition, when supplying the inert gas, the supply amount of the inert gas may be controlled by the supply amount and the pressure in the furnace.

The present invention can be applied as a heat treatment apparatus for the purpose of drying, gasification, etc. of woody biomass and organic waste, as well as drying resins, foods, organic substances, etc., and can be applied to other industrial machines. Become.

1 Rotary Heat Treatment Device 10 Cylindrical Heating Furnace (Furnace Body)
20 Screw conveyor 22 Outer casing 24 Screw casing 26 Screw shafts 28A, 28B Gas supply pipes 30A, 30B Gas discharge port 32 Screw casing 34 Hot air cylinder 36A Guide vane 36B Guide vane 38 Cover member 40 Release port PA1 First passage PA2 Second passage H blockade space

Claims (9)

An outer casing partially fitted to one end of the furnace body for heat-treating the workpiece;
A screw conveyor that is disposed on the inner peripheral side of the outer casing and conveys the workpiece;
A gas supply pipe connected to the outer casing and supplying heated gas to a space between the outer casing and the screw conveyor;
From the space between the outer casing and the screw conveyor, the gas supplied from the gas supply pipe is provided between the furnace body, the fixed casing disposed at one end of the furnace body, and the furnace body and the fixed casing. A gas discharge port for discharging into a sealed space outside the outer casing surrounded by the sealing material;
A rotary heat treatment apparatus comprising: The rotary heat treatment apparatus according to claim 1, wherein the temperature of the gas supplied by the gas supply pipe is higher than the temperature inside the furnace or the screw conveyor. The rotary heat treatment apparatus according to claim 1 or 2, wherein the gas is an inert gas. The rotary heat treatment apparatus according to any one of claims 1 to 3, wherein a plurality of the gas supply pipes are installed in an outer casing. The rotary heat treatment apparatus according to any one of claims 1 to 4, wherein the gas discharge port is formed in a portion of the outer casing that is located downstream in the gas flow direction. The rotation according to any one of claims 1 to 5, further comprising: a second sealing material that seals a space between the furnace main body and the outer casing on the furnace inner side from the gas discharge port. Type heat treatment equipment. A screw conveyor that is disposed at one end of the furnace body for heat-treating the workpiece and conveys the workpiece;
A cylindrical outer casing that is disposed on the outer periphery side of the screw conveyor while extending through the first passage that is a space, and extends to the furnace body side end of the screw conveyor;
A gas supply pipe connected to the outer casing and supplying heated gas into the first passage;
A cylindrical hot air tube that is disposed on the outer peripheral side of the outer casing while extending through the second passage that is a space, and extends to the end of the screw conveyor on the furnace body side;
The first passage and the second passage are communicated by closing so as to connect between the end of the screw conveyor on the furnace body side and the one end of the hot air tube while having a gap between the one end of the outer casing. A lid material to be
A rotary heat treatment apparatus comprising: Guide vanes that spirally divide the spaces in the first passage that is a space between the screw conveyor and the outer casing and in the second passage that is a space between the outer casing and the hot air tube. The rotary heat treatment apparatus according to claim 7, which is formed. A sealed space sealed by a plurality of sealing materials exists on the outer peripheral side of the hot air tube,
The rotary heat treatment apparatus according to claim 7 or 8, wherein an outlet for discharging the gas after passing through the second passage into the sealed space is provided at an end portion of the hot air tube.

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