JPH08285262A - Device and method to feed waste tires into combustion furnace - Google Patents

Abstract

PURPOSE: To provided a feeding device and method by which waste tires can be constantly fed into a combustion furnace, and a stable combustion can be ensured. CONSTITUTION: Waste tires 1 are fed to a reactor by a charging hopper 2. The fed waste tires 1 are first crushed and mixed by a crushing blade 4 to be evened. Then, the reactor is tapered in toward the tip, the waste tires 1 are compressed, and of which the volumes are reduced while being continuously transferred to the tip. Also, the compressed and volume-reduced waste tires 1 work as a sealing member in order to prevent a pyrolytic gas generated at the tip of the reactor from reversing. The waste tires 1 being transferred to the tip of the reactor are heated to raise the temperature by hot air 7 from the outside of the reactor, and are dehydrated and thermally decomposed and become a flammable pyrolytic gas and pyrolytic residue 8. Further, these are charged in a combustion furnace 6 by the hot air 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for supplying and treating waste tires to a combustion furnace.

[0002]

2. Description of the Related Art Along with the increase in automobile production, the amount of waste tires discharged tends to increase, and the method of treating waste tires has become a problem from the social and environmental viewpoints. As a general treatment method, there is a method of treating it in the incinerator as it is, but due to its bulky shape and high calorific value compared to municipal waste, hot spots partially occur in the incinerator,
There is a problem that the furnace wall refractory is damaged to shorten the life of the furnace. In order to solve such a problem, there is a method in which a dedicated burning furnace for waste tires is installed or a waste tire is supplied in advance to a combustion furnace by providing a pretreatment device for crushing / volume reduction treatment, drying treatment and the like.

Japanese Unexamined Patent Publication (Kokai) No. 58-222185 discloses a waste tire dry distillation furnace in which a combustion gas exhaust pipe and an off gas exhaust pipe for residual carbon combustion are provided, and at least two dry distillation furnaces are provided side by side.

In Japanese Unexamined Patent Publication (Kokai) No. 5-296427, waste is dry-distilled in a gasification furnace to generate a combustible gas, and while supplying oxygen, it is introduced into a combustion furnace through a gas pipe and burned. A dry distillation gasification incinerator is disclosed.

[0005]

However, since the techniques disclosed in JP-A-58-222185 and JP-A-5-296427 are intermittent type treatment equipment rather than continuous type treatment, the waste tires used are The next scrap tire cannot be put in until it is completely processed. If a continuous processing facility is used, there are problems that the facility cost is high, a large installation area is required, and operation and maintenance costs such as maintenance are required. If the waste tire is made finer in order to improve the combustibility of the waste tire, the combustibility increases, but the crushing cost increases, which is not economical.

The present invention has been made to solve the above problems, and provides a stable treatment method and apparatus by continuously supplying waste tires to a combustion furnace without pretreatment equipment.

[0007]

SUMMARY OF THE INVENTION The present invention provides a supply device and a waste tire incinerator using the supply device, which has functions of crushing / kneading, compression / volume reduction, dehydration / pyrolysis of a waste tire. Is the method of supply.

The present invention comprises a reaction tube provided at the hot air blowing port to the combustion furnace, and a hopper for supplying waste tire to the reaction tube. The reaction tube is tapered, and the reaction tube is provided in the reaction tube. , A pushing device for supplying the waste tire into the reaction tube and transferring it to the tip, a crushing device for crushing and mixing the waste tire are provided, and the tip of the reaction tube is exposed to hot air to the extent that the waste tire inside is dehydrated and thermally decomposed. It is a waste tire supply device characterized by being heated. Furthermore, the method for supplying a waste tire of the present invention uses the above-mentioned supply device, and the temperature of the central portion of the reaction tube is set to the thermal decomposition temperature of the waste tire or less, and the temperature of the tip of the reaction tube is set to the thermal decomposition temperature of 550 ° C. or more and 650 ° C. or less. It is characterized by being controlled.

The temperature at the center of the reaction tube is preferably lower than the thermal decomposition temperature of the waste tire, and more preferably 100 ° C. or lower. Further, the temperature can be adjusted by the cooling water in the outer cover of the supply device.

Waste tires begin to decompose at 300 ° C, and 4
When the temperature rises above 00 ° C, the decomposition progresses rapidly, and when it reaches 500 ° C, 60% of the vulcanized rubber is decomposed and gasified, and when it reaches 650 ° C or higher, only carbon black which is a non-evaporating component of the tire remains. . Therefore, the final temperature reached in the thermal decomposition section at the tip of the reaction tube may be 550 ° C. or higher and 650 ° C. or lower as long as it is the thermal decomposition temperature of the waste tire or higher than the temperature at which the oil content in the waste tire vaporizes.

[0011]

The waste tire is supplied to the reaction tube by the input hopper. The supplied waste tires are first crushed and kneaded by a crushing blade to be homogenized. Next, the reaction tube is tapered, and the waste tire is continuously transferred to the tip and compressed and reduced in volume. Further, the compressed / reduced waste tire acts as a seal material for preventing backflow of pyrolysis gas generated at the tip of the reaction tube. The waste tire transferred to the tip of the reaction tube is heated and heated by the hot air from the outside of the reaction tube,
Dehydrated and pyrolyzed to form flammable pyrolysis gas and pyrolysis residue. Further, these are introduced into the combustion furnace by hot air.

[0012]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic front view of an apparatus according to an embodiment of the present invention. In FIG. 1, 1 is a waste tire, 2 is a charging hopper, 3 is a screw, 4 is a crushing blade, 5 is a motor, 6 is a combustion furnace, 7 is hot air, 8 is pyrolysis gas and pyrolysis residue, and 9 is cooling water. The inlet 10 is a cooling water outlet.

The waste tire 1 is put into the hopper 2 and supplied into the reaction tube. The waste tire 1 put into the reaction tube is crushed and kneaded by the crushing blade 4. Then, the waste tire 1 is continuously transferred to the central portion of the reaction tube and the tip portion of the reaction tube by the rotation of the screw shaft. The reaction tube is tapered,
The waste tire 1 is compressed and reduced in volume while being transported. Further, it is gradually heated and heated by the hot air 7 to undergo dehydration and thermal decomposition to become flammable thermal decomposition gas and thermal decomposition residue 8. The flammable pyrolysis gas and the pyrolysis residue 8 are introduced into the combustion furnace 6 by the hot air 7.

The hot air may be an inert gas such as nitrogen, air, or oxygen-enriched air. When the hot air is air or oxygen-enriched air, the hot air is mixed with the pyrolysis gas generated by pyrolysis and the pyrolysis residue, and also serves as a combustion burner.

The pyrolysis gas and the pyrolysis residue generated by the pyrolysis may be introduced into the combustion furnace by hot air and burned only in the combustion furnace. From the portion where the pyrolysis gas and the pyrolysis residue are in contact with the hot air, Combustion may be initiated.

As a method of heating the tip of the reaction tube with hot air, hot air may be generated by a hot air generator and used for heating, or combustion exhaust gas may be used for heating.

The method of transferring the portion corresponding to the device for pushing in the waste tire in the apparatus of the present invention may be any method as long as the waste tire can be transferred steadily, such as transfer by rotation of the screw,
The transfer by a piston type can be mentioned.

Example 1 is a case where the apparatus of the present invention is installed in a small combustion furnace of 5 t / day, waste tires are supplied at a rate of 1 t / day, and carbonization and thermal decomposition are carried out with hot air. The results are shown in Table 1.

The second embodiment is the same as the first embodiment except that hot air nitrogen is used instead of the hot air.
The results are shown in Table 1.

A comparative example is a case where a waste tire is directly charged from the upper part of a small combustion furnace of 5 t / day without using the apparatus of the present invention. The results are shown in Table 1.

[0021]

[Table 1]

From Table 1, in Examples 1 and 2, the amounts of unburned carbon and carbon monoxide generated were smaller than those of Comparative Example, incomplete combustion did not occur, and the combustibility was good. In addition, the amount of nitrogen oxide, which is an environmental problem, was small, and extremely stable combustion was possible.

[0023]

EFFECTS OF THE INVENTION Waste tires can be supplied to a combustion furnace without the need for pretreatment equipment such as crushing and dehydration, and without problems such as equipment wear and tear. Generation of local hot spots is suppressed, and it is highly versatile in that it can be processed in an incinerator.
Further, since the waste tire is put into the combustion furnace as a gaseous fuel, stable operation of the combustion furnace becomes possible.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Waste tire 2 Input hopper 3 Screw 4 Crushing blade 5 Motor 6 Combustion furnace 7 Hot air 8 Pyrolysis gas, pyrolysis residue 9 Cooling water inlet 10 Cooling water outlet

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Takeshi Konishi, 1-2, Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Ichiro Ueno, 1-2, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd.

Claims (2)

[Claims] 1. An apparatus for supplying waste tires to a combustion furnace, comprising a reaction tube provided at a hot air blowing port to the combustion furnace, and a hopper for supplying waste tires to the reaction tube. The taper is configured to be tapered, and the reaction tube has a pushing device for supplying the waste tire into the reaction tube and transferring it to the tip, crushing the waste tire,
A device for supplying waste tires to a combustion furnace, wherein a crushing device for mixing is provided, and the tip of the reaction cylinder is heated by hot air to the extent that the waste tires inside are dehydrated and thermally decomposed. 2. The supply device according to claim 1, wherein the temperature of the central portion of the reaction tube is controlled to be equal to or lower than the thermal decomposition temperature of the waste tire and the temperature of the tip portion of the reaction tube is controlled to 550 ° C. or higher and 650 ° C. or lower. And a method for supplying waste tires to a combustion furnace.