JPS5812489B2 - rubber tire incinerator - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rubber tire incineration device.

Due to the huge amount of waste rubber tires, their disposal has become a serious problem.

What can be reused as recycled rubber is limited to natural rubber such as truck and bus tires, and the reuse of synthetic rubber tires such as passenger car and light truck tires has hardly been put to practical use, so 2/3 of the waste tires are recycled. requires some kind of punishment.

Currently, disposal methods include landfilling, incineration, and other methods, such as crushing or crushing to use in the form of rubber fibers, powdered rubber, cord fibers, etc., and pyrolysis to recover oil, gas, carbon black, etc. However, landfilling is disliked because it requires crushing the size to 15 x 15 cm or less and deteriorates the soil quality.The use of rubber fibers and powdered rubber requires application development, and the use of cord fibers is not recommended. is not economical, and recovery of oil, gas, and carbon black is not yet practical.

Therefore, in the long term, resource recovery will be the focus, but in the short term, incineration and landfill will be the main method of disposal.

Incineration of rubber tires has traditionally had two drawbacks.

That is, firstly, it is necessary to crush it into small pieces before incineration, and secondly, soot may be generated during incineration.

Rubber is composed of hydrocarbon compounds and has a high CZH ratio, so carbon is easily released during incineration and becomes soot.
Also, in order to prevent soot from being generated,
Before placing the rubber tires in the incinerator, it is necessary to crush them into small pieces to ensure adequate incineration air contact.

It is an object of the present invention to overcome this conventional drawback and provide an apparatus for efficiently incinerating rubber tires.

That is, the gist of the present invention is an apparatus that performs high-temperature incineration by putting a rubber tire as it is into an incinerator without crushing it, and injecting combustion air preheated to a high temperature into the rubber tire.

To explain one embodiment of the present invention with reference to the drawings, in FIG. 1, rubber tires IA, IB, and IC are first supplied to a position 1C by a transport device (not shown), and dampers 2A, 2B,
This prevents the gas in the incinerator 3 from leaking into the supply port 4 of the rubber tire, and moves it into the incinerator.

The incinerator 3 is covered with a fireproof wall 5 except that a part of the bottom of the furnace is open to a gas passage through a particle layer 11 which will be described later.

The rubber tires 1A, IB, and IC are stopped by dampers 2A and 2B, but when the dampers open, they roll down into the furnace due to their own weight and stop at a stopper 6.

When the rubber tire comes to the position of one person, combustion air heated to a high temperature by an air preheater (not shown) flows into the air ports 7A, 7.
B is blown into the rubber tire, causing it to burn at high speed.

The air ports 7B are oriented horizontally so as to wrap around one rubber tire, and the air ports 7A are arranged so as to face directly the rubber tire 1, so that the combustible gas emitted by thermal decomposition from the rubber tire 1A and the carbon liberated at this time, etc. Rubber tire 1A
It can be burned while being trapped in the surrounding area.

In this way, the combustible gas completes combustion while flowing along the arrow in the incinerator 3, and the free carbon also flows in the direction of the arrow, but since it takes time to burn, a layer of carbon 9 is formed on top of the particle layer 11. It accumulates.

Therefore, combustion air heated to a high temperature is blown out from the air ports 8A and 8B and hit the soot layer 9 to cause combustion. At this time, too, the air port 8B blows out air horizontally to prevent the soot from flying away. Air is blown toward the soot layer 9 through the air ports 8A while creating an air curtain.

After a single rubber tire releases combustible gases and free carbon, a residue remains, which consists of combustibles and ash.

High-temperature air is also blown onto this residue, so the combustibles are left with oxygen that diffuses like an oat, leaving only the ash.

Since the ash retains most of the original shape of the rubber tire, a pusher 10 is provided to remove it.

Rubber tires may contain steel wires, but when a rubber tire is burnt, the steel wires become brittle and become sticky.
easily crushed under pressure.

The particle layer 11 is made of heat-resistant particles such as sand or fine iron particles, and is supplied by a particle supply hopper 12 and a particle lock feeder 13, and is moved at the bottom of the combustion furnace 3 by a vibrating conveyor 14. A soot layer 9 is deposited on top of this particle layer in the opening provided at the bottom of the furnace and is therefore transported with this soot layer 9 on top.

By adjusting the moving speed and operating speed of the pusher, the soot layer 9 is completely combusted, and the ashes of one rubber tire and the soot ashes are carried out together with particles from the bottom of the incinerator 3 and fall onto the vibrating sieve 15.

Ash and particles are separated by a vibrating screen 15 and fall into an ash pot 16 (equipped with a lock feeder 17) and a particle pot (equipped with a lock feeder 19), respectively.

The lump of non-combustible material does not pass through the vibrating sieve 15 and falls into the non-combustible material hopper 20, but this is a water seal and no outside air enters from here.

The particles are returned to the feed hopper 12 by a device not shown.

After the combustion gas 21 passes through the particle layer 11 to remove dust, it flows from the combustion gas hopper 22 to an air preheater (not shown), which heats the above-mentioned combustion air. As a result, thermal energy is saved.

FIG. 2 shows another embodiment of the invention, which differs only in the method of supplying the rubber tire.

Rubber tires IA, IB, and IC are first stacked by a transport device (not shown) centering around a guide shaft 23 whose lower end is open as shown in 1C,
5 into the furnace.

Here too, the dampers 2A and 2B are used to seal the combustion gas in the furnace from leaking to the supply side.

This method differs from the previous embodiment in that the rubber tire that enters the furnace burns on its side as shown in 1.d This method requires a pusher for feeding, but there is no need for a stopper (which is subject to harsh high-temperature operating conditions in the furnace). This is advantageous in that 6) in FIG. 1 is not required.

The residue after combustion is discharged by pusher 10, as in the previous embodiment.

In the present invention, as detailed above, hydrocarbons, which are the main components of rubber tires, are thermally decomposed to become combustible gas, which is combusted upon contact with combustion air, and the carbon liberated at the same time is also used for high-temperature, high-speed combustion. Burns quickly on contact with air.

Fiber additives and other substances contained in rubber tires remain at the bottom of the incinerator and burn there, but they also come into contact with the high-temperature, high-speed combustion air, so they burn relatively quickly.

However, in this case, it is quite difficult to completely burn the free carbon, and complete combustion cannot be achieved unless the free carbon is properly exposed to high-temperature combustion air. This layer captures unburned carbon, and blows combustion air over this layer to burn it.

By using the incinerator of the present invention having such a structure, rubber tires can be incinerated in their original form without being crushed, and there are advantages in that they do not generate soot and can also remove dust. If a desulfurizing agent is used in the particles of the layer, desulfurization can be performed at the same time, which has great effects.

[Brief explanation of the drawing]

1 and 2 are simplified side sectional views showing respective embodiments of the present invention. IA, IB, IC...Tire, 2A, 2B...Datsupa,
3...Incinerator, 11...Particle layer.

Claims (1)

[Claims] 1. An incinerator in which a part of the furnace bottom is open and provided with a supply port for rubber tires to be incinerated, and a particle layer that is provided to circulate and move in the opening in the furnace bottom through which air can pass; It consists of an air port for ejecting air horizontally from the side wall of the incinerator to form an air curtain on the upper surface of the particle layer, and a combustion gas hopper provided at the bottom of the particle layer, which supplies the gas into the incinerator. Rubber tire incineration is characterized in that the tire is surrounded by high-temperature air ejected from an air port and burned, the soot deposited on the particle layer is incinerated, and the combustion gas is discharged downward through the particle layer. Device 6