JP2005273926A - Rotary kiln apparatus and pyrolizing facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively pyrolize a material by effectively agitating/carrying the material and preventing the material from being lumped. <P>SOLUTION: A plurality of agitating/carrying blades 27 are installed in the circumferential and axial directions of a rotatably cylindrical rotary kilns 1 and 2. A flexible member (chain) 28 is installed across agitating/carrying blades 27 adjacent to each other in the circumferential direction of the rotary kilns 1 and 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a facility for reducing and reducing the volume of raw materials containing various organic substances (solids containing various organic substances, various sludges, soils, etc.) by a thermal decomposition reaction, and particularly equipped with stirring and conveying blades. The present invention relates to a rotary kiln device and a pyrolysis facility.

  Various organic substances, various sludges, soil, earth and sand, etc., which are various raw materials (processed materials), are pyrolyzed in a reducing atmosphere by indirect heating and processed such as drying, carbonization, ashing, purification, etc. Has been done. When using a pyrolysis means that contains raw materials inside the rotary kiln and thermally decomposes the raw materials by indirect heating, the rotary kiln is designed to effectively stir and transport the raw materials including heating efficiency. Ingenuity is given. For example, installation of a plurality of blades, a device for the furnace inner wall, or the like.

  In Patent Document 1, the heat transfer tubes (blades) in the rotary kiln are provided to be inclined forward, and in Patent Documents 2 and 3, the rotary kiln is inclined downward from the upstream side toward the downstream side. In addition, the blades are fixed to the inner wall of the rotary kiln. Also in Patent Document 4, the blades are fixed to the inner wall of the rotary kiln. In Patent Document 5, the rotary kiln is provided with an inclination. The inner wall of the rotary kiln is formed in a polygonal shape, so that stirring and transport are effectively performed.

Moreover, in patent document 6, the blade which devised the shape was fixed to the inner wall of a rotation kiln, and in patent document 7, the blade | wing which devised the shape and arrangement | positioning was provided in the inner wall of the rotation kiln. Shows that the pin-shaped projections are provided at predetermined intervals on the inner wall of the rotary kiln. In Patent Document 9, the inner wall of the rotary kiln is provided with blades devised in shape and arrangement. In Patent Document 10, A plurality of spiral lifters are provided on the inner wall of the rotary kiln. Further, in Patent Document 11, in which sludge is continuously dried and burned, the rotary kiln is inclined and the raw material is crushed by a flexible member (chain) to improve the processing efficiency. It is shown.
JP 2002-156105 A JP 2000-97567 A JP 2000-153523 A JP 2000-249475 A JP-A-7-120161 JP-A-8-110164 Japanese Patent Laid-Open No. 11-63830 Japanese Patent Laid-Open No. 10-267239 Japanese Patent Laid-Open No. 10-54523 JP-A-8-233234 Japanese Patent No. 2869643

  As described above, the conventional rotary kiln apparatus and the thermal decomposition facility are provided with blades for stirring and transporting the raw material in the rotary kiln, and these blades have the properties of the raw material, the residence time, and the rotational speed of the rotary kiln. And other factors such as height, length, and inclination angle are determined. However, although the blade shape and arrangement conditions according to the properties of various raw materials are technically accumulated, it is unclear unless they are actually operated, and conventionally, all the blades in the rotary kiln are fixed. Therefore, it is not easy to change the shape and installation position of the blades, and it has been dealt with by limited means such as adjustment of the rotational speed of the rotary kiln (adjustment of the residence time of the raw material) and adjustment of the heating temperature.

  In addition, it may be difficult to obtain a raw material in an amount suitable for the actual load test, and the sample test result with a small amount of raw material is good. In reality, there is a discrepancy with the results of the sample test. This is due to an increase in the operating cost of the facility due to the fact that the optimum pyrolysis treatment cannot be performed on the raw material, the consumption of the heating source fuel increases, and the operation time is prolonged.

In addition, when the raw material is a hydrous material, it may be viscous. For example, in the case of sludge by the activated sludge method, the viscosity may be high due to the presence of microorganisms. In addition, the viscosity may be further increased due to the presence of the flocculant used when processing into dehydrated sludge.
Thus, when the viscosity of the raw material is high, the raw material adheres to the inner wall of the rotary kiln or the agitating / conveying blade, or aggregates into a dumpling-like lump, resulting in a decrease in heat transfer efficiency and heat processing (drying However, in any of the above-described techniques, it is difficult to efficiently stir and convey the raw material and eliminate the change of the raw material into dumpling agglomeration. In the case of Patent Document 11 as well, it is possible to prevent dumping to some extent due to the presence of the flexible member. However, when the conveyance is performed by the inclination of the rotary kiln, the control of the agitation / conveyance of the material is naturally performed. There was a limit.

  Therefore, the inventor can efficiently stir and convey the raw material during the rotation of the rotary kiln by providing means exclusively for stirring and conveying and a flexible means exclusively for crushing the raw material. It was found that crushing of can be promoted.

  The present invention has been made to solve the above-described problems, and can efficiently stir and convey the raw material, thereby effectively performing the optimum thermal decomposition on the raw material. It is another object of the present invention to provide a rotary kiln apparatus and a pyrolysis facility that can effectively perform pyrolysis processing while preventing agglomeration of raw materials.

  According to a first aspect of the present invention, there is provided a rotary kiln apparatus comprising a plurality of agitating / conveying blades in a circumferential direction and an axial direction in a rotatable and cylindrical rotating kiln. Thus, a flexible member for crushing the raw material is provided.

  The thermal decomposition facility according to claim 2 is provided with a plurality of stirring / conveying blades in a circumferential direction and an axial direction in a rotatable and cylindrical rotary kiln, and raw material introducing means and discharging means at both ends of the rotary kiln. A flexible member that breaks down the raw material by bridging between the stirring and conveying blades in a thermal decomposition facility equipped with thermal decomposition means that contains the raw material inside the rotary kiln and thermally decomposes the raw material by indirect heating Is provided.

  In the rotary kiln apparatus or the thermal decomposition facility according to claim 3, the flexible member is provided by bridging between the stirring / conveying blades adjacent in the circumferential direction of the rotary kiln.

  In the rotary kiln apparatus or the thermal decomposition facility according to the fourth aspect, the flexible member is provided by bridging between the stirring / conveying blades facing in the radial direction of the rotary kiln.

  In the rotary kiln apparatus or the thermal decomposition facility according to claim 5, the flexible member is provided by bridging between the stirring / conveying blades adjacent in the axial direction of the rotary kiln.

  As described above, according to the present invention, since the flexible member is provided as the raw material crushing means between the stirring / conveying blades, the raw material is appropriately engaged with the flexible member when the rotary kiln is rotated. Thus, the crushing is promoted, the agglomeration of raw materials is prevented, and pyrolysis processing (drying and carbonization) can be effectively performed. Moreover, since it is easy to install a flexible member in addition to an existing rotary kiln apparatus or thermal decomposition facility, it is possible to easily cope with a case where the raw material is changed from a non-viscous one. it can. Further, since the stirring / conveying blade is provided, the raw material is efficiently stirred and transported, and the thermal decomposition processing of the raw material is also effectively performed. Therefore, it is possible to reduce the operating cost of the facility such as saving of the heat source fuel and shortening the operation time.

Best Embodiment 1
The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram of a thermal decomposition facility according to the first embodiment of the present invention. Reference numerals 1 and 2 denote cylindrical rotary kilns. External heating means 3 and 4 for heating are provided, a rotary kiln 1 and external heating means 3 form a drying furnace (heating hot air temperature 300 to 450 ° C.), and a rotary kiln 2 and external heating means 4 form a carbonization furnace ( Heating hot air temperature 400-650 ° C.) is formed. Hot air gas is introduced into the external heating means 4 from a hot air furnace 5 having a combustion burner, and this hot air gas is also introduced into the external heating means 3 and then exhausted through a pipe 19. As will be described later, a plurality of stirring / conveying blades are provided in the rotary kilns 1 and 2 in the circumferential direction and the axial direction.

  On one end side of the rotary kiln 1, a hopper 6 for storing raw materials, a motor-driven transfer means 7 and a charging box 8 are provided. The other end side of the rotary kiln 1 is connected across the other end side of the rotary kiln 2. A box 9 is provided. In addition, annular protrusions 1 a and 1 b are provided on the outer periphery of the portion near both ends of the rotary kiln 1, and the protrusions 1 a and 1 b are rotatably supported by the rotation support rollers 10 and 11. Further, a sprocket is provided on the projecting portion 1 b side of the rotary kiln 1, and the sprocket and the motor 12 as a driving source are connected by a chain 13.

  Similarly, protrusions 2a and 2b are provided at both end portions of the rotary kiln 2, and the protrusions 2a and 2b are rotatably supported by the rotation support rollers 14 and 15, respectively. Are connected by a chain 17 via a sprocket. A collection box 18 is provided on one end side of the rotary kiln 2.

  A pipe 20 is branched and connected to the pipe 19, and a circulation blower 21 and an ejector blower 22 are provided in the pipe 20. The pipe 20 is connected to a gas combustion furnace 23 having an ejector and a combustion burner. Further, the connection box 9 is connected to the gas combustion furnace 23 through a pipe 24, and a cracked gas made of dry distillation gas, water vapor, etc. generated by the raw material drying process is fed into the gas combustion furnace 23 for combustion purification. The combustion exhaust gas from the gas combustion furnace 23 is discharged through the gas-gas heat exchanger 25 and the like. The heat exchanger 25 and the hot stove 5 are connected by a pipe 26.

  1A and 1B show a longitudinal front view and a side view of a rotary kiln device according to the first embodiment, and the inner walls of the rotary kilns 1 and 2 are arranged in a spiral manner, that is, in a circumferential direction and an axial direction. A stirring / conveying blade 27 is provided, and a flexible member (chain) 28 that bridges between the stirring / conveying blades 27 adjacent in the circumferential direction to crush the raw material is provided.

  Next, the operation of the above configuration will be described. The raw material (object to be processed) is charged into the rotary kiln 1 through the hopper 6, the conveying means 7 and the charging box 8. The rotary kilns 1 and 2 are rotationally driven by motors 12 and 16, and the workpieces introduced into the rotary kiln 1 are effectively stirred and transported by providing the stirring and transport blades 27. Further, the flexible member 28 is provided by bridging between the stirring / conveying blades 27 adjacent to each other in the circumferential direction, so that the flexible member 28 comes into contact with the raw material and the raw material is crushed. The inside of the rotary kiln 1 is heated to a predetermined temperature by hot air gas, and the object to be processed is dried (moisture removed) by indirect heating to become a dried substance, which is discharged to the connection box 9. In the connection box 9, the dried material is guided by the guide 9 a and fed into the other end of the rotary kiln 2. Also in the rotary kiln 2, the dried product is conveyed while being agitated by the agitating / conveying blades 27, and is provided with a flexible member 28 by bridging between the agitating / conveying blades 27 adjacent in the circumferential direction. Crushing takes place. In the meantime, it is indirectly heated by the hot air gas from the hot air furnace 5, and the dried product is pyrolyzed (carbonized) to become a carbide, and this carbide is recovered from one end of the rotary kiln 2 through the recovery box 18.

  The pyrolysis gas generated in the rotary kilns 1 and 2 is introduced from the connection box 9 into the gas combustion furnace 23 through the pipe 24 and the ejector, and is purified by combustion. The gas combustion furnace 23 is heated by its own combustion burner, and part of the hot air gas discharged from the external heating means 3 is fed through the pipe 20 and heated to about 850 ° C. The combustion exhaust gas from the gas combustion furnace 23 is introduced with temperature-adjusted air, and then heat-exchanged with external air in the heat exchanger 25 and cooled to 200 to 150 ° C. The external air heated by heat exchange is introduced into the hot stove 5 through the pipe 26. On the other hand, the cooled combustion exhaust gas is discharged from the chimney through the bag filter and the exhaust blower.

  In the first embodiment, the flexible member 28 is provided between the stirring / conveying blades 27 adjacent in the circumferential direction, and the flexible member 28 is in contact with the raw material when the rotary kilns 1 and 2 are rotated. By combining the raw materials, even if they are viscous materials, the raw materials are crushed, the raw materials are prevented from agglomerating, and pyrolysis (drying, carbonization) is effectively performed, making the pyrolysis optimal for the raw materials. It can be performed. In addition, since it is easy to add a flexible member to an existing rotary kiln apparatus or thermal decomposition facility, it is possible to easily cope with the presence or absence of the viscosity of the raw material. Further, since the plurality of stirring / conveying blades 27 are provided in the circumferential direction and the axial direction in the rotary kilns 1 and 2, the raw materials can be effectively stirred and conveyed including heating efficiency. Therefore, it is possible to reduce the operating cost of the facility such as saving of the heat source fuel and shortening the operation time.

Embodiment 2
3 (a) and 3 (b) show a longitudinal front view and a side view of a rotary kiln device according to Embodiment 2 of the present invention. In Embodiment 2, the circumferential direction and axis of the inner walls of the rotary kilns 1 and 2 are shown. A plurality of agitating / conveying blades 27 are provided in the direction, and a flexible member (chain) 28 is provided to bridge between the agitating / conveying blades 27 facing in the substantially radial direction. Other configurations are the same as those of the first embodiment.

  In the second embodiment, a flexible member 28 is provided by bridging between the agitating / conveying blades 27 facing the substantially radial direction of the rotary kilns 1 and 2, and the raw material is crushed by the flexible member 28. And the pyrolysis process is effectively performed. In addition, the same effects as in the first embodiment are obtained.

Embodiment 3
FIG. 4 shows a longitudinal front view of the rotary kiln device according to the third embodiment. In the third embodiment, a plurality of stirring / conveying blades 27 are provided in the circumferential direction and the axial direction of the inner walls of the rotary kilns 1 and 2. A flexible member (chain) 28 is provided between the stirring / conveying blades 27 adjacent in the axial direction. Other configurations are the same as those of the first embodiment.

  In the third embodiment, a flexible member (chain) 28 is provided by bridging between the agitating / conveying blades 27 adjacent to each other in the axial direction of the rotary kilns 1 and 2. Crushing is performed and pyrolysis processing is effectively performed. In addition, the same effects as in the first embodiment are obtained.

  In each of the above-described best embodiments, the flexible members 28 are respectively disposed between the agitating / conveying blades 27 adjacent in the circumferential direction, between the agitating / conveying blades 27 opposed in the substantially radial direction, or in the axial direction. Although the bridge is provided between the conveying blades 27, the effect can be further enhanced by combining these. In addition, since the raw material is already dried in the rotary kiln 2, it is not necessary to provide the flexible member 28 if the raw material is not agglomerated.

It is the longitudinal section front view and side view of the rotary kiln apparatus by Embodiment 1 of this invention. 1 is a configuration diagram of a thermal decomposition facility according to Embodiment 1. FIG. It is the vertical front view and side view of the rotary kiln apparatus by Embodiment 2. It is a vertical front view of the rotary kiln apparatus by Embodiment 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 ... Rotary kiln 3, 4 ... External heating means 8 ... Input box 9 ... Connection box 10, 11, 14, 15 ... Rotation support roller 18 ... Collection box 27 ... Stirring and conveyance blade 28 ... Flexible member (chain )

Claims (5)

  In a rotary kiln apparatus equipped with a plurality of stirring / conveying blades in a circumferential direction and an axial direction in a rotatable cylindrical kiln, a flexible member that bridges between the stirring / conveying blades and crushes the raw material A rotary kiln device characterized by being provided.   A plurality of agitating and conveying blades are provided in the circumferential direction and the axial direction in a rotatable, cylindrical rotary kiln, and raw material introduction means and discharge means are provided at both ends of the rotary kiln, and raw materials are stored inside the rotary kiln. In a pyrolysis facility equipped with a pyrolysis means for pyrolyzing the raw material by indirect heating, a thermal decomposition is provided, which is provided with a flexible member that bridges between the stirring and conveying blades and crushes the raw material Facilities.   The rotary kiln apparatus or the thermal decomposition facility according to claim 1 or 2, wherein the flexible member is provided by bridging between the stirring / conveying blades adjacent in the circumferential direction of the rotary kiln.   The rotary kiln apparatus or thermal decomposition facility according to any one of claims 1 to 3, wherein the flexible member is provided by bridging between the stirring / conveying blades facing each other in a substantially radial direction of the rotary kiln. The rotary kiln apparatus or the thermal decomposition facility according to any one of claims 1 to 4, wherein the flexible member is provided by bridging between the stirring / conveying blades adjacent in the axial direction of the rotary kiln.

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