JPS5824910Y2 - Char removal device in external heating rotary kiln type pyrolysis equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a char removal device that can prevent oil in cracked gas from condensing and adsorbing to char in an external heating rotary kiln type pyrolysis device.

Recently, as part of efforts to effectively utilize resources, there has been an increasing need to reuse secondary products such as gas, oil, and char produced by thermally decomposing organic waste such as waste tires.

This pyrolysis equipment includes external heat kiln type, internal heat kiln type,
Many methods have been developed, such as the fluidized bed method, but in the external heat kiln method, the thermally decomposed product in the kiln does not come into direct contact with the combustion gas for heating, so it is an indirect heating method. The advantage is that the product is obtained.

On the other hand, in this rotary kiln, tires for supporting the kiln are placed on both sides of the kiln heating furnace, and seals are provided at both ends of the kiln to seal the inside of the kiln, so there are areas on both sides of the kiln that cannot be heated by the heating furnace. This results in a considerable length of time, which causes inconvenience to the processed material.

In other words, in the non-heated section on the exit side of the kiln, the pyrolyzed gas and char are gradually cooled, and there is a risk that the oil in the gas will condense and be adsorbed by the char, which can be used as carbon black or activated carbon. It reduces the quality of char.

In order to prevent this, it is sufficient to keep the outside surface of the kiln sufficiently warm, but this is extremely difficult due to its structure.

In view of these points, the present invention uses a simple structure to keep the non-heated part warm and allow the processed material to pass through quickly to shorten the cooling time, thereby solving the above-mentioned disadvantages. It is.

The present invention provides an external heating type rotary kiln type pyrolysis apparatus, in which a space between the outlet of the kiln and the inside of the heating furnace is 1 mm or more than the inner diameter of the kiln.
A cylinder with a small outer diameter is inserted so that the inlet side of the cylinder is in contact with the inner circumferential surface of the kiln, and a screw blade is provided on the inner circumferential surface of the cylinder to push out the solid content inside toward the outlet side. It is.

Hereinafter, the present invention will be explained with reference to drawings of embodiments.

Reference numeral 1 denotes a rotary kiln body made of heat-resistant cast steel or heat-resistant steel plate, and a heating furnace 5 is arranged on the outer periphery of the rotary kiln body to heat the inside of the furnace. The main body 1 is supported and typically rotated by a chino or a gear (only one side is shown in the drawing).

Further, the outlet side of the main body 1 is sealed with a gland packing or the like by a stuffing box 3, and the inlet side (not shown) is also sealed with a similar configuration.

A hood 4 is connected to the outlet side of the main body 1.
The decomposed gas, char, etc. are separated within the tank.

In addition, in the case of a countercurrent type, gas is sucked from the front part of the kiln main body 1, but the present invention can be applied to that case as well.

A heat insulating cylinder 6 having an outer diameter slightly smaller than the inner diameter of the main body 1 is inserted into the outlet side of the kiln main body 1, and is connected to the main body 1 by a 7-lunge 8 at the end.

The tip of the heat insulation cylinder 6 is expanded into a trumpet shape (tapered part 7).
A screw 9 is formed on the inner surface of the heat retaining cylinder 6 so as to contact the inner circumferential surface of the main body 1 at a position corresponding to the inside of the heating furnace 5, and to push out the solid content inside toward the outlet side.

This screw 9 has a large pitch and a small flight height, and the tip has a taper 10 to prevent problems such as wires and other solid objects from getting caught even if the processed material contains wires or other solid objects. , and the corners of the screw blades are rounded.

A space 11 is formed between the heat retaining tube 6 and the main body 1 and serves as a heat insulating layer, but this space 11 may be filled with an appropriate heat insulating material to further improve the heat insulating effect.

In this configuration, the processed material charged from the inlet side (not shown) is decomposed by heat from the heating furnace 5 in the rotating kiln and reaches the taper portion 7 as gas and char.

Heat is no longer applied to this part from the heating furnace 5, but a heat insulating tube 6 that is kept warm at a certain distance from the main body 1
Since cooling is prevented by the char and rapidly sent to the outlet by the screw 9, oil condenses on the char.
Gas and good quality char are separated and taken out in the hood 4 without adsorption.

As explained above, the present invention aims to prevent cooling of the char in an external heating rotary kiln type pyrolysis apparatus by inserting a heat insulating cylinder with a screw into the outlet section inside the kiln. With a simple configuration, it is possible to reliably prevent oil adsorption to char, and it is possible to extract char of excellent quality, which can contribute to the effective use of resources.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway sectional view showing an embodiment of the present invention;
The figure is a sectional view taken along the line ■-H. 1...Kiln body, 4...Hood, 5...Heating furnace, 6...Heat insulation cylinder, 1...Taper part, 9...Screw.

Claims (1)

[Scope of utility model registration request] In an external heat type rotary kiln type pyrolysis apparatus, a cylinder having an outer diameter that is about the same as the inner diameter of the kiln is inserted between the outlet of the kiln and the inside of the heating furnace so that the inlet side of the cylinder is in contact with the inner surface of the kiln, A char removal device for an external heating rotary kiln type pyrolysis device, characterized in that the inner peripheral surface of the cylinder is provided with a screw blade for pushing out the solid content inside toward the outlet side.