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External heating rotary kiln and operation method thereof

An external heating and rotary kiln technology, applied in lighting and heating equipment, rotary drum furnaces, furnaces, etc., can solve the problems of errors, huge fluctuations, and difficult to achieve stable carbonization temperature control, and achieve reliable temperature control and heating treatment. Effect

Active Publication Date: 2008-07-30
MITSUBISHI HEAVY IND LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, since the gas temperature in the rotary kiln is measured by any of these methods, the carbonization temperature of the material being processed is not necessarily displayed, and there is concern due to changes in the balance of radiation and convection in the kiln or materials adhering to the temperature sensor and an error occurs
In addition, the inlet properties of organic waste including sewage sludge, such as treated volume and water content, fluctuate greatly, making stable control of carbonization temperature difficult to achieve

Method used

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  • External heating rotary kiln and operation method thereof
  • External heating rotary kiln and operation method thereof
  • External heating rotary kiln and operation method thereof

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Embodiment Construction

[0022] The invention will now be described with reference to the embodiments shown in the drawings.

[0023] Fig. 1 shows an example in which an externally heated rotary kiln 1 according to the present invention is used as a carbonization furnace. In FIG. 1 , a rotary kiln 1 includes an inner cylinder 11 (kiln shell) and an outer cylinder 12 (flame shield) for causing heating gas to flow around the inner cylinder 11 . The inner cylindrical body 11 is supported so as to be rotatable about an axis on a movable side end portion 13 and a fixed side end portion 14 movable in the axial direction. In the movable side end 13 forming the inlet portion of the inner cylinder 11, a screw conveyor 10 for filling the substance to be processed is provided, and in the fixed side end 14 forming the outlet portion of the inner cylinder 11, for A launder 15 for discharging the substance to be treated is provided.

[0024] More specifically, in the movable-side end portion 13 of the inner cylin...

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Abstract

The externally heated rotary kiln (1) comprises a kiln internal cylinder (1) rotating around an axis and an external cylinder (12) for guiding heating gas to flow around the kiln internal cylinder. The heat treatment is performed while being conveyed axially in the kiln interior barrel. The kiln internal cylinder is rotatably supported on the movable side end (13) and the fixed side end (14) that can move in the axial direction, and the device for measuring the axial thermal elongation of the kiln internal cylinder (114 ) and a plurality of non-contact thermometers (126) for measuring the shell temperature (T11 to T32) at multiple positions in the axial direction of the kiln inner cylinder from the outer wall portion of the outer cylinder are provided. The temperature in the rotary kiln rotating around the shaft can be accurately measured corresponding to the temperature of the material to be processed, so that temperature control of the heating temperature can be performed.

Description

technical field [0001] The present invention relates to an externally heated rotary kiln for use as a carbonization furnace, a pyrolysis furnace, a heat treatment furnace or the like and a method for its operation. Background technique [0002] Externally heated rotary kilns comprise an outer shell surrounding a rotary kiln (kiln inner shell) which rotates about an axis. The rotary kiln is heated from the outside by the induced heating gas flowing in the external cylinder, so that the heat treatment is carried out while the material to be treated is conveyed axially in the rotary kiln. Externally heated rotary kilns are also called indirectly heated rotary kilns, because rotary kilns are constructed so that the heated gas does not contact the substance being processed, and are widely used as carbonization furnaces or other furnaces, such as pyrolysis furnaces, heat treatment furnaces and drying furnaces . [0003] Utilizing the above characteristics of externally heated ro...

Claims

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Application Information

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IPC IPC(8): F27B7/08F27B7/42
Inventor 彰野间猛甘利宏司关野慎也常泉顺一千叶洋民山本
Owner MITSUBISHI HEAVY IND LTD
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