JP2003075069A - Sealing structure or rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing structure in a rotary kiln wherein stable sealing property can be kept unchanged with pressing force kept unchanged irrespective of thermal expansion. SOLUTION: A sealing structure is adapted such that in a combination of at least one end of a rotary drum 1 of a rotary kiln and a fixed cover case 2, the inside and the outside of the rotary kiln is sealed by interposing a sealing member 33 formed annularly between a flange shaped mounting plate 31 formed surrounding the outer periphery of the rotary drum 1 and a hollow annular press plate 22 extending from the fixed cover case 2 through a bellows 21. In the sealing structure, there are provided a plurality of air cylinder apparatuses 34 as pressure control means between the fixed cover case 2 and the press plate 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a seal structure in a combined portion of an end portion of a rotary drum of a rotary kiln and a fixed cover case.

[0002]

2. Description of the Related Art A rotary kiln targeted by the present invention is
As shown in FIG. 2, a rotary drum 1 for heating an object
Are rotatably supported on the inlet side and the outlet side, and the inlet side is combined with a fixed inlet fixed cover case 11 and the outlet side is combined with a fixed outlet fixed cover case 12. Then, the object to be heated is fed into the furnace by the screw feeder 13 and heat-treated. In the drawing, the heating jacket 14 is used for indirect heating, and the end of the rotary drum 1 is provided with both fixed cover cases 1 so that the gas inside the furnace does not leak to the outside air and the outside air does not leak into the furnace.
The seal mechanism 15 and 16 are hermetically sealed between 1 and 12.

[0003] Such a rotary kiln seal structure 1
In Nos. 5 and 16, when both the inlet side and the outlet side are surface-sealed by the pressing force of the spring in the furnace length direction, the spring length also changes as the total length of the rotating drum changes due to thermal expansion, so the pressing pressure changes with temperature. There was a problem that the sealing effect became unstable.

Further, in the rotary drum 1 made of stainless steel material, about 1.8 mm / 100 per 1000 mm
Since the thermal expansion of ℃ occurs, the thermal expansion of the rotating drum becomes very large in the actual machine where the total length reaches several meters to several tens of meters. Therefore, the spring type seal structure has large initial surface pressure and rated surface pressure. There was a gap, and it was extremely difficult to design to maintain the surface pressure, and the reality was that it could not be adopted. Also,
Although a gland packing type seal structure in which a packing is interposed on the sliding surface is sometimes used, the gland packing type is a structure that is not subject to thermal expansion in principle, but is similar to a rotary kiln. As a means for sealing the sliding part between the rotating member and the fixed member, since the surface pressure of the sliding part cannot be kept high, the sealing property tends to be insufficient, causing gas leakage from the inside or conversely external air. However, there is a problem in that the invasion of the furnace into the furnace is likely to occur.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in a rotary kiln, the pressing pressure is constant irrespective of thermal expansion, and stable sealing performance can be maintained. Provide a sealing structure.

[0006]

SUMMARY OF THE INVENTION The above problem is caused by a flange plate provided on the rotary drum and a pressing member extending from the fixed cover case in a combination portion of at least one end of the rotary drum of the rotary kiln and the fixed cover case. A seal member is interposed between the plate and the seal structure for sealing the inside and outside of the rotary kiln, and the flange plate and the seal member, or the pressing plate and the seal member are slidable, This can be solved by the rotary kiln sealing structure of the present invention, which is characterized in that a pressure control means is provided between the fixed cover case and the pressing plate.

In the present invention, the pressure control means is a plurality of air cylinder devices, and a tip of a piston rod driven by the air cylinder devices is connected to the pressing plate, or the sealing member. Can be embodied as a seal structure of a rotary kiln having a concave groove opened toward a sliding flange plate or a pressing plate and provided with a steam enclosing portion to which steam is supplied from the outside. Further, in the form in which the steam encapsulation part is provided, the steam encapsulation part is preferably embodied in a form capable of shutting off the leakage of the gas in the furnace and the leakage of the outside air in the furnace by supplying steam having a pressure higher than the pressure in the furnace it can.

According to the present invention, a seal member is interposed between a flange plate provided on a rotary drum and a pressing plate provided by disengaging a pressure control means such as an air cylinder device from a fixed cover case. Because of the seal structure that seals the inside and outside of the kiln, the thermal expansion of the rotary drum is absorbed by the stroke of the air cylinder device, and the pressing pressure does not change depending on the temperature. Further, since the seal structure has the seal member having the vapor enclosing portion, there is an advantage that the gas leak inside and outside can be effectively prevented.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a seal structure for a rotary kiln according to the present invention will be described with reference to FIGS. In the present invention, as a rotary kiln, as shown in FIG. 2, a rotary drum 1 for heating an object is rotatably supported on an inlet side and an outlet side, and the inlet side is fixed to an inlet fixed cover case 11, The outlet side is combined with a fixed outlet fixing cover case 12. Then, the object to be heated is fed into the furnace by the screw feeder 13 and heat-treated. In the figure, heating jacket 1
4 is configured to be indirectly heated, and the end portion of the rotary drum 1 is fixed to both fixed cover cases 1 so that the gas in the furnace does not leak to the outside air and the outside air does not leak into the furnace.
The point that airtightness is sealed by the seal structure between 1 and 12 is based on the configuration known in the related art.

The feature of the present invention is that, as shown in the partial view of the essential part of FIG. 1, in the combined portion of at least one end of the rotary drum 1 of the rotary kiln and the fixed cover case 2, An annular seal member 33 is provided between a flange-shaped mounting plate 31 formed around the outer periphery of the rotary drum 1 and a hollow annular pressing plate 32 extending from the fixed cover case 2 through the bellows 21. It is a seal structure that is interposed to seal the inside and outside of the rotary kiln.

In this case, the flange plate 3
1 and the seal member 33 are fixed, the pressing plate 32 and the sealing member 33 are slidably arranged, and a plurality of air cylinder devices 34 are provided as pressure control means between the fixed cover case 2 and the pressing plate 32. It can be said that the point where is provided is a structural feature. In this case, the tip of the piston rod 35 driven by the air cylinder device 34 is connected to the pressing plate 32, and the pressing plate 32 is pressed against the seal member 33 with a predetermined pressing pressure,
Moreover, the sliding operation allows the rotary operation of the rotary drum 1 and the sealing action inside and outside the furnace to be performed at the same time.

In this embodiment, the flange plate 31 and the sealing member 33 are fixed, and the pressing plate 32 and the sealing member 33 are slidably arranged.
The sealing member 33 may be fixed, and the flange plate 31 and the sealing member 33 may be deformed so as to be slidably arranged.

As described above, the present invention is preferably applied to a rotary kiln type waste pyrolysis furnace in a gas conversion system. In this embodiment, the case where the seal structure of the present invention is adopted for the outlet part has been described, but the effect of thermal elongation can be eliminated by using it for either the inlet part or the outlet part, so it may be used for the inlet part. Needless to say, the seal structure of the present invention may be used for both the inlet and the outlet.

Further, in the embodiment of FIG. 1, the seal member 33 is formed of a molded carbon material, and has a U-shaped cross section in which a steam-filled portion 33a in the form of a concave groove formed over the entire circumference is formed. , The steam encapsulation portion 33a to the pressing plate 32
It is arranged to be slidable toward. Then, if steam of about 30 kPa is introduced from the outside into the steam sealing portion 33a and, for example, if a large positive pressure is maintained with respect to the furnace pressure of 1.5 kPa, the leakage of the furnace gas is surely prevented, and External air can also be prevented from entering the furnace.

Further, in the present invention, the vapor enclosing portion 33 is provided.
The water vapor introduced into a is liquefied to form a water film on the sliding surface and acts as a lubricant between the seal member 33 and the holding plate 32 to smooth the sliding. The rotation operation can be made smoother,
This water film fills the minute spaces between the sliding surfaces to prevent gas leakage, and therefore plays the role of more effectively maintaining the sealing effect.

[0016]

Since the seal structure of the rotary kiln of the present invention is constructed as described above, the thermal expansion of the rotary drum is absorbed by the cylinder device and the pressing pressure of the seal portion is kept constant. It is possible to achieve stable and constant sealing performance. Also,
By introducing water vapor into the seal portion, there is an excellent effect that the leakage of gas in the furnace and the leakage of outside air into the furnace can be reliably blocked, and the pressure inside the furnace can be normally maintained. Therefore, the present invention has an extremely great industrial value as a seal structure of a rotary kiln that solves the conventional problems.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part showing an upper side of a center line for explaining an embodiment of the present invention.

FIG. 2 is a schematic sectional view illustrating a rotary kiln to which the present invention is applied.

[Explanation of symbols]

1 rotating drum, 11 inlet fixed cover case, 12
Fixed outlet cover case, 13 screw feeder, 1
4 heating jacket, 2 fixed cover case, 21 bellows, 31 mounting plate, 32 pressing plate, 33 sealing member, 34 air cylinder device, 35 piston rod.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuo Ogata             2-56, Sudacho, Mizuho-ku, Nagoya-shi, Aichi             Inside Hon insulator Co., Ltd. (72) Inventor Shunichi Mishima             2-56, Sudacho, Mizuho-ku, Nagoya-shi, Aichi             Inside Hon insulator Co., Ltd. F term (reference) 3J041 AA02 BA03 BB02 BC03 BD06                       DA01 DA04                 3J043 AA03 AA17 BA03 CA03 CA04                       CB18 DA02 DA05 FA01                 4K061 AA08 CA21

Claims (4)

[Claims] 1. A seal member is interposed between a flange plate provided on the rotary drum and a holding plate extending from the fixed cover case at a combined portion of at least one end of the rotary drum of the rotary kiln and the fixed cover case. And a sealing structure for sealing the inside and outside of the rotary kiln, wherein the flange plate and the sealing member or the pressing plate and the sealing member are slidable, and the fixed cover case and the pressing plate are A seal structure for a rotary kiln, characterized in that a pressure control means is provided therebetween. 2. The seal of a rotary kiln according to claim 1, wherein the pressure control means is a plurality of air cylinder devices, and a tip of a piston rod driven by the air cylinder devices is connected to the pressing plate. Construction. 3. The seal member according to claim 1 or 2, wherein the seal member is provided with a steam enclosing portion which is formed of a concave groove opened toward a sliding flange plate or a pressing plate and to which steam is supplied from the outside. Rotary kiln seal structure. 4. The rotary kiln sealing structure according to claim 3, wherein steam having a pressure higher than the pressure in the furnace is supplied to the steam encapsulation portion so that leakage of the gas in the furnace and leakage of the outside air in the furnace can be blocked. .