JP5835840B2 - Stirring circular incinerator - Google Patents

Description

  The present invention relates to an agitating circular incinerator that blows air sent from a rotating branch air blowing pipe from the branch air blowing branch pipe and simultaneously burns the treatment object while stirring the treatment object. The treatment object is dried in the incinerator. An object of the present invention is to provide an agitated circular incinerator capable of incinerating even a treated product containing a large amount of moisture such as sludge because it can be combusted.

  In recent years, there has been a demand for a treatment apparatus that can perform sludge reduction or incineration in sewage containing a large amount of water. As an apparatus suitable for this purpose, an apparatus combining a dryer and a stirring circular incinerator has attracted attention. However, as described above, sewage sludge containing a large amount of water is different from the sludge treatment that has been performed in the past, the treatment object is bulky and the amount of treatment increases, and a large incinerator is required to respond to it. It is necessary.

To increase the size of the agitated circular incinerator, it is necessary to increase the combustion bed area. To achieve this, the length of the branch air duct that becomes the rotating arm that supplies air to the corner of the incinerator It is necessary to lengthen the length. In this case, the branch air duct has a strong structure including the branch air duct because it is likely to bend due to its own weight or to be easily subjected to resistance caused by rotation from the processed material. Usually, according to the design standard of a cantilever structure in consideration of deflection, a structure having a strength proportional to the cube of the length is required in order to increase the length of the branch air blowing pipe. In addition, the branch air blow pipe is a structure used in the incinerator and is strongly influenced by heat, and it is necessary to consider the selection of the material and the cooling method. As the amount of deflection of the branch air duct, for example, even in an incinerator having an effective floor area of 20 m ² , the tip side of the branch air duct exceeds 50 mm when the temperature is raised to 450 ° C. If this is left unattended and the operation is continued, the air outlet and the hearth surface of the incinerator bite, and there is a drawback that the rotation of the branch air blow pipes cannot be sustained.

  On the other hand, some sewage sludges, which are the objects of treatment, have various calorific values and contain sand, and also have regional characteristics, increasing the difficulty in operating incinerators. Furthermore, the incineration ash of this sewage sludge is characterized by a high ash content. In order to treat sewage sludge with the characteristics described above, the behavior of sewage sludge is appropriate so that drying ash, combustion, incineration, and reburning of incineration ash with carbonized components remaining and cooling can be performed reliably. However, it is important to stabilize the floor of the incinerator to control the behavior of sewage sludge.

JP 60-17619 A JP-A 61-17826 JP 2009-243744 A

  The present invention solves the above-mentioned drawbacks, can efficiently treat sewage sludge, and supports the deflection of the branch blast pipe with a heat-resistant small particulate material laid on the hearth, and appropriately adjusts its thickness. Thus, the length of the branch blast pipe can be increased, and the combustion bed area can be increased. Further, the hearth surface can be prevented from being damaged by the heat-resistant small particulate matter.

The present invention solves the above-described problem, and a rotatable air blowing shaft tube is provided at the center of the incinerator, and branch air blowing tubes are radially extended from the rotating air blowing shaft tube. In a stirring circular incinerator intended for a processed product containing a lot of water, which is provided with a branch air blowing branch pipe, a heat resistant small particulate material is laid on the flat heat resistant hearth of the incinerator, and air blowing and stirring are performed. The lower end portion on the tip side of the branch blast branch pipe that also serves as the heat-resistant small particulate matter is formed so as to rotate around the rotary blast shaft tube, and a rotational torque load is applied to the lower end portion. It is characterized by an agitating circular incinerator provided with protrusions that reduce the friction resistance with the heat-resistant small particulate matter .

Further, the branch blower branch pipes located on the front end side of each branch blower pipe are formed in a flat cross-sectional shape, and the treated product put into the stirring circular incinerator is moved to the rotary blower shaft pipe side. It is characterized by an agitating circular incinerator that is attached with an inclination angle of 20 to 80 degrees with respect to the extending direction of the branch air duct.

  In addition, the branch blower branch pipe located on the tip side of each branch blower pipe is a blocking plate that prevents the processed material put into the stirring circular incinerator at the lower part thereof from moving to the side wall side of the incinerator. It is characterized by an agitating circular incinerator provided with.

  Further, the heat-resistant small particulate matter is characterized by a stirring circular incinerator in which the particle diameter is 5 mm or less and / or the heat-resistant spherical material such as ceramic or metal having a particle diameter of 5 mm or less.

  In the present invention, oxygen is given to the processed material by the air blown from the branch air blowing branch pipe through the branch air blowing pipe, and the treatment object is stirred by the branch air blowing branch pipe so that oxygen is efficiently distributed and burned. Therefore, incineration processing can be performed even for a processed product containing a lot of moisture such as sludge. At that time, since the branch air duct extends radially from the rotary air duct tube, its distal end side bends, and the branch air duct branch sinks, but the heat-resistant small particles laid on the hearth It can be held in a state of being lifted from the hearth by an object, and can be continued without applying a load to the rotation of the branch air blow pipe without the lower end thereof being in contact with the hearth.

  In addition, the size of the deflection differs depending on the temperature in the incinerator and the length, weight, strength, etc. of the branch air blow tube, but it can be dealt with by appropriately changing the thickness of the heat-resistant small particulate matter. The thickness can be adjusted by adjusting the height of the weir on the side of the rotary fan shaft tube, and the ash generated by the treatment of the treated material can be appropriately discharged out of the incinerator. It was.

  In addition, since the heat-resistant small particulate matter is a heat-resistant spherical material such as small-diameter sand, ceramic, metal, etc., the heat-resistant small particulate matter having heat in the incinerator contains a large amount of water such as sewage sludge. The contact with the treated product facilitates drying and accelerates incineration.

  In addition, it is possible to efficiently move the treatment object to the center side of the incinerator by forming the branch air blowing branch pipe at the tip portion in a flat cross section and setting the attachment angle to the direction to push the treatment object to the center side. In addition, it is possible to prevent the processed material from being pushed to the furnace wall side by attaching a blocking plate to the member.

  Further, by providing a protrusion with low frictional resistance at the lower end portion of the branch blast branch pipe, it becomes possible to prevent friction of the member and reduce the rotational torque load of the branch blast pipe.

The schematic longitudinal cross-sectional view of the stirring circular incinerator of this invention. The top view of a branch ventilation pipe and a branch ventilation branch pipe. (A), (b) The top view of the branch ventilation pipe | tube of the position of (a), (b) of FIG. The top view which shows the relationship between a branch ventilation pipe and a branch ventilation branch pipe. (A) Side view of branch air blowing branch pipe at tip end, (b) AA plan view of branch air blowing branch pipe at tip end, (c) Plan view of branch air blowing branch pipe at BB end of tip end. The inner side schematic sectional drawing of a stirring circular incinerator.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows a schematic longitudinal sectional view of a stirring circular incinerator 1 of the present invention. The agitated circular incinerator 1 has a rotary air blower tube 3 projecting into the furnace from the lower side at the center on the hearth 2 in the circular furnace, and radially from the top of the rotary air blower tube 3. A plurality of rotating arms (hereinafter referred to as branch air ducts) 4, 4,... Are extended to each of the branch air ducts 4, 4. The branch pipes 5, 5,.

  Of the plurality of branch air blowing branch pipes 5, 5,..., The shape of the branch air blowing branch pipes 5 positioned at the front end or the innermost portion of the branch air blowing pipes 4, 4,. Is formed into a flat cross-section, and the branched blower pipe is arranged so that the processed material A put into the stirred circular incinerator 1 moves toward the rotary blower shaft pipe 3 which is the central part of the stirred circular incinerator 1. 4 is inclined with respect to the extending direction.

  FIG. 2 is a plan view showing the relationship between the branch air blowing pipes 4, 4... Rotating in the stirring circular incinerator 1 and the branch air blowing branch pipe 5 at the tip thereof, and FIGS. FIG. 4 shows an enlarged plan view of the branch blower pipe 4 at the positions shown in FIGS. 2A and 2B, and FIG. 4 shows an enlarged plan view showing the relationship between the branch blower pipe 4 and the branch blower branch pipe 5. FIG. As shown in FIGS. 3 (a) and 3 (b), the branched blower branch pipe 5 is a cylindrical projecting pipe, but the branched blower branch pipe 5a at the tip shown by the dotted line is centered on the processed product A. In order to be moved to the part, the cross section is flattened, and the longitudinal direction thereof is attached to the branch air duct 4 with an inclination angle of approximately 30 degrees with respect to the longitudinal direction of the branch air duct 4.

  As shown in FIG. 2, when the rotation direction of the branch air blow pipe 4 is counterclockwise, the branch air blow branch pipe 5a becomes a wide surface in the longitudinal direction by attachment at an inclination angle of about 30 degrees. The object A is pushed out in the direction of arrow C which is the central part. The inclination angle is not limited to the above numerical value, and an inclination angle of 20 to 80 degrees is selected as necessary depending on the object A to be processed, the rotation speed, and the like.

  FIG. 5A shows a side view of the branch air blowing branch pipe 5a at the tip, and an appropriate number of friction preventing projections 6 are provided outward from the peripheral wall of the lower end thereof. The friction preventing projection 6 has a curved surface at the tip side, and reduces the contact resistance with the hearth 2, the heat-resistant small particulate matter or the processed material A described below with respect to the rotation of the branch air duct 4, and prevents friction. And it plays a role of reducing the load of rotational torque.

  Further, as shown in FIGS. 5A, 5B, and 5C, a blocking plate for preventing the processed material A from moving to the side wall side of the incinerator 1 on the side wall of the branch air blowing branch pipe 5a. 7 is formed. The blocking plate 7 has a plate-like shape, one end of which is attached to the side wall of the branch air blowing branch pipe 5a, and the other end is formed to protrude outward from the branch air blowing branch pipe 5a. The rotation track on the other end side of the blocking plate 7 is on the outer side of the rotation track on the tip of the branch air duct 4, and the treatment A is attached to the incinerator 1 by the inclined attachment of the branch air duct 4. It can prevent moving to the side wall side.

  Although the said processed material A can also assume the reduction | decrease and incineration of the sludge which contains water | moisture contents, such as a sewage sludge, since the treatment amount increases compared with a normal sludge, a stirring circle It is necessary to make the mold incinerator 1 large, and it is conceivable to increase the length of the branch blast tube 4. In this case, deflection occurs due to its own weight, or it becomes easy to receive a large resistance from the processed material A as it rotates, and in order to prevent this, it is necessary to use a branch air duct with a strong structure and a structure that considers the deflection. is there.

  FIG. 6 shows the branch air blowing pipe 4 in a state of being cooled (indicated by a dotted line in the figure) and in operation (indicated by a solid line in the figure). While maintaining a substantially horizontal state at the time of cooling, when the branch blower tube 4 extends and is exposed to a high temperature in the incinerator 1, the tip side is bent toward the hearth 2 as shown by a solid line. In this state, there is a possibility that the branched air blowing branch pipe 5a on the front end side contacts the hearth 2. Therefore, as shown in FIG. 6, a fluid heat-resistant small particulate matter 8 is laid on the hearth 2 to a predetermined thickness.

  The heat-resistant small particles 8 are preferably sand having a particle size of up to about 5 mm or heat-resistant spheres of 5 mm or less. The heat-resistant small particulate matter 8 is laid on the flat hearth 2 as shown in FIG. The entire thickness of the hearth 2 is laid, and the thickness thereof is set to be substantially the same as the height set by the height-adjustable weir 9 provided on the rotary air-shaft tube 3 side in the center. The height of the weir 9 is appropriately selected depending on the type of the processed material A, the heating temperature, the stirring speed, and the like.

  With the above configuration, the stirring circular incinerator 1 is a heated heat-resistant small particulate matter on the hearth 2 in the incinerator 1 heated through the rotary blower shaft tube 3, the branch blower tube 4 and the branch blower branch tube 5. 8 to be processed. The branch blower pipe 4 blows out air while stirring the processed product A. At the same time, the front end side of the branch blower pipe 4 bends due to its weight and high temperature, and the branch blower branch pipe 5a located on the front end side thereof. Is rotated while stirring the processed product A in a state where it is in contact with or slightly embedded in the heat-resistant small particulate matter 8 while passing through the heat-resistant small particulate matter 8 slightly by blowing from the branch air blowing branch pipe 5a. . Since the anti-friction protrusion 6 is provided at the lower end of the branch air blowing branch pipe 5a, it plays a role of preventing resistance associated with rotation.

  The attachment position of the branch blower branch pipe 5a on the front end side and the blocking plate 7 attached thereto are attached to the rear end of the branch blower pipe 4 in the rotating direction. At the same time as being fed to the center of the furnace 1, the movement of the incinerator 1 toward the side wall is prevented by the blocking plate 7.

  Even in the processed product A containing a large amount of water such as sewage sludge, the water is removed by the high temperature in the incinerator 1, dried, and burned by oxygen in the air blown from the branch blower pipe 4 and the branch blower branch pipe 5. To do. The temperature in the incinerator 1 is controlled at 550 ° C. to 820 ° C. at the outlet of the incinerator 1. The processed material A is agitated and combusted by the rotation of the branch blast tube 4, and gradually moves to the center of the incinerator 1, but the carbide burns slowly on the center side, becomes ash, passes over the weir 9, and is discharged. Will be collected.

A Processed object 1 Stirring circle type incinerator 2 Hearth 3 Rotating fan shaft tube 4 Branch fan tube 5 Branch fan branch tube 6 Friction prevention protrusion 7 Blocking plate 8 Heat-resistant small particulate matter 9 Weir

Claims (4)

A rotatable rotary blower shaft tube is provided in the center of the incinerator, extending the branch blower tube radially from該回transfer wind shaft tube, the said branch air duct lot of water formed by a plurality of branch blowing branch pipes In a stirring circular incinerator intended for a treated product, a heat-resistant small particulate material is laid on the flat heat-resistant hearth of the incinerator, and the lower end on the tip side of the branch air blowing branch pipe that serves both for blowing and stirring Forming the rotary part around the rotary air blowing tube while contacting or burying the heat resistant small particulate matter, reducing the rotational torque load at the lower end, and the heat resistant small particulate matter. A stirring circular incinerator characterized by being provided with protrusions that reduce frictional resistance . The branch blower branch pipe located at the tip side of each branch blower pipe is formed in a flat cross-sectional shape, and the branch blower is blown so that the processed material put into the stirring circular incinerator moves to the rotary blower shaft pipe side. 2. The stirred circular incinerator according to claim 1 , wherein the stirred circular incinerator is attached with an inclination angle of 20 to 80 degrees with respect to a tube extending direction. The branch blower branch pipe located on the tip side of each branch blower pipe is provided with a blocking plate at the lower part thereof to prevent the processed material put into the stirring circular incinerator from moving to the side wall side of the incinerator. The agitated circular incinerator according to claim 1 or 2 , characterized by comprising: The stirred circular incinerator according to any one of claims 1 to 3 , wherein the heat-resistant small particulate matter is a heat-resistant spherical material such as sand having a particle size of 5 mm or less and / or ceramic, metal or the like of 5 mm or less. .

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