JP2006299010A - External heating rotary kiln - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an external heating rotary kiln to prevent the deposition of dust, suppress the lowering of thermal efficiency and the variation of carbonization, increase the quality of carbonized product and enable efficient operation by scraping up the dust transported with hot air. <P>SOLUTION: A combustible waste is carbonized by dry distillation to form a carbonized material and the gas generated by the dry distillation is used as a heat source of an external heating rotary kiln 10. The dust deposited in a heating zone 18 is scraped up toward the exhaust port 21 and discharged at need by forming a spiral lifter 16 on the outer circumference of an inner cylinder 11 or forming a plurality of spiral lifters at intervals on the outer circumference of the inner cylinder. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an externally heated rotary kiln that produces carbonized carbon by combusting combustible waste and uses a carbonized gas generated during carbonization as a heat source.

  FIG. 4 shows an example of a waste treatment system in which combustible waste is carbonized and an externally heated rotary kiln in which the carbonized gas generated here is directly or indirectly used as a heat source is installed. In this figure, combustible waste that has been crushed and shredded and reduced in volume (hereinafter referred to as “volume reduction treatment”) is put into the inner cylinder 51 of the external heating type rotary kiln 50 by a quantitative supply means (not shown). The combustible waste carbonized and carbonized in the external heating rotary kiln 50 is sent to a carbide cooling means (not shown), and the carbonization gas generated in the carbonization zone is burned and deodorized in the deodorizing furnace X to heat the external heating rotary kiln. The zone 58 is supplied as hot air.

  Here, patent document 1 can be mentioned as an external heating type rotary kiln generally employ | adopted until now.

JP 2001-131556 A (Means for solving problems and FIG. 1)

  In the external heating rotary kiln, when the generated dry distillation gas is used as a heat source, dust is mixed in the hot air, and the dust accumulates in the heating zone of the external heating rotary kiln. When it is deposited unevenly, dry distillation unevenness occurs and the carbonization state varies, and the quality of the carbide decreases.

  Moreover, in order not to become the said state, it is necessary to remove dust regularly, For that purpose, an external heating type rotary kiln must be stopped, and it leads to the fall of productivity and the fall of thermal efficiency.

  In view of the above-described problems of the prior art, the present invention suppresses a decrease in thermal efficiency by collecting dust carried together with hot air into the heating zone of the externally heated rotary kiln so as to suppress the decrease in thermal efficiency. It is an object of the present invention to provide an externally heated rotary kiln capable of preventing variation in the carbonized state and discharging dust scraped up to the outside of the apparatus at any time without stopping the apparatus.

  In order to solve the above-described problems, the present invention provides a carbide lifter by carbonizing combustible waste, and arranging a spiral lifter on the outer peripheral surface of the inner cylinder in an external heating type rotary kiln using a carbonization gas generated during carbonization as a heat source. Provided, and a discharge port for dust accumulated in the heating zone is provided at a point of the outer cylinder. Specifically, the spiral lifter is provided on a continuous spiral blade or on the spiral orbit of the inner cylinder surface. A plurality of dividing blades are arranged, and dust accumulated in the heating zone is scraped toward the dust discharge port by the thrust of the spiral lifter.

  According to the present invention configured as described above, the dust sent together with the hot air into the heating zone of the externally heated rotary kiln is constantly scraped toward the dust discharge port and is discharged to the outside of the device at any time. In addition, the heat conduction becomes uniform and the carbonization and carbonization without variation proceed, and a high-quality carbide can be obtained.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment in which an inner cylinder 11 of an external heating type rotary kiln 10 is integrally provided with support rings 12 at both ends thereof, and is supported by a support roller 13 via the support rings 12. A gear 14 is integrally fitted to the gear 14, and a pinion 15 is engaged with the gear 14 so as to rotate at a predetermined speed.

  On the outer peripheral surface of the inner cylinder 11, a spiral lifter 16 that is wound in an opposite direction from the center toward the outside is integrally provided, and an outer cylinder 17 is disposed outside the outer cylinder 17 so as to cover the whole. The inner cylinder 11 and the outer cylinder A heating zone 18 through which hot air passes is formed.

  Hot air supply pipes 19 are connected to the heating zone 18, and each hot air supply pipe 19 is connected to a main pipe 20 and connected to a deodorizing furnace X (see FIG. 4) that is a hot air supply source. A dust discharge port 21 is provided at the center of the outer cylinder 17. The discharge port 21 may be provided at one end of the apparatus, and when provided at one end, the spiral direction of the spiral lifter is one direction.

  The combustible waste whose volume has been reduced toward the inner cylinder 11 of the external heating rotary kiln 10 is constantly supplied by a quantitative supply device (not shown), dried and dry-distilled, and carbonized. The dry distillation gas discharged from the discharge port 22 and generated by dry distillation is sent to the deodorizing furnace X shown in FIG.

  2 is an AA arrow view of FIG. 1, and the inner cylinder 11, the outer cylinder 17, the spiral lifter 16, the hot air discharge pipe 23, the hot air supply pipe 19, and the dust discharge port 21 of the external heating rotary kiln 10 are shown. It is shown.

  FIG. 3 shows an inner cylinder of the second embodiment, and on the outer peripheral surface of the inner cylinder 11, a large number of divided blades, that is, spiral lifters 16 a are intermittently provided on a plurality of virtual spiral trajectories in opposite directions from the center toward both ends. It is arranged. Since the rest is the same as that of the first embodiment, the description thereof is omitted.

  In Embodiment 2 configured in this manner, the dust accumulated in the heating zone is scraped by the spiral lifter 16a, and thrust is applied to the dust discharge port 21 (see FIGS. 1 and 2). Can be taken out. In this embodiment as well, a discharge port can be provided at one end of the apparatus. In this case, the spiral lifter 16a is disposed on the spiral track in the same direction.

  As described above, according to the present invention, the dust sent together with the hot air into the heating zone of the external heating type rotary kiln is continuously scraped up toward the dust discharge port by the spiral lifter provided continuously and intermittently. Therefore, it is possible to obtain a high-quality carbide without causing a decrease in thermal efficiency, and with uniform heat conduction and non-fluctuation dry distillation / carbonization. In addition, the scraped dust can be discharged at any time without stopping the apparatus, so that productivity is improved and thermal efficiency can be increased.

Front view of externally heated rotary kiln according to Example 1 AA arrow view of FIG. Front view of the inner cylinder of the externally heated rotary kiln according to the second embodiment Schematic view of the external heat rotary kiln around the waste treatment system

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Outer heat type rotary kiln 11 Inner cylinder 12 Support ring 13 Support roller 14 Gear 15 Pinion 16 Spiral lifter 17 Outer cylinder 18 Heating zone 19 Hot air supply pipe 20 Main pipe 21 Dust discharge port 22 Discharge port (of carbide)
23 Hot air discharge pipe

Claims (2)

  In an externally heated rotary kiln that produces carbonized carbon by combusting combustible waste and using the carbonized gas generated during carbonization as a heat source, a spiral lifter is installed on the outer peripheral surface of the inner cylinder, and heating is performed at the main points of the outer cylinder. An externally heated rotary kiln characterized by providing a discharge port for dust accumulated in the zone.   The spiral lifter is a continuous spiral blade or a plurality of divided blades arranged on a spiral orbit on the surface of the inner cylinder, and the dust accumulated in the heating zone is collected by the thrust of the spiral lifter. The externally heated rotary kiln according to claim 1, wherein the externally heated rotary kiln is scraped toward the discharge port.

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