JP2002166257A - Cooling method for heat decomposition residue generated from heat decomposition furnace and cooling device for the heat decomposition residue - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling method and a cooling device for heat decomposition residue which has a good efficiency in cooling the heat decomposition residue and is capable of proceed simultaneous separation of char from other residue upon the reuse of the char in the residue generated from the heat decomposition in a heat decomposition furnace. SOLUTION: The cooling method comprises: To mix a large number of a small diametrical steel balls 1 with the highly heated residue A generated by heat decomposition of trash, or the like, and to make the cooling of the residue A by transfer of the heat of the heat decomposition residue A to the steel balls 1, and then to separate the steel balls 1 from the heat decomposition residue A so as to residue the balls 1 for repeating the initial process after they are cooled down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cooling a pyrolysis residue mainly generated by pyrolysis of refuse and the like, and cooling the pyrolysis residue for recycling the char (carbide) of the pyrolysis residue. The present invention relates to a method for cooling a thermal decomposition residue from a thermal decomposition furnace and a device for cooling a thermal decomposition residue.

[0002]

2. Description of the Related Art Recently, pyrolysis furnaces for extracting flammable gas and char by pyrolysis without directly burning garbage due to problems such as dioxin generation have been diversified as the direction of incineration of municipal garbage. In the direction. The pyrolysis residue taken out of such a pyrolysis furnace has a high temperature of around 500 ° C., and requires cooling to separate its char, take it out, and reuse it.

[0003] Regarding the cooling of bottom ash and the like in a garbage incinerator, there is no problem even if water is directly sprayed on the bottom ash, but the pyrolysis residue from the pyrolysis furnace reuses its char (carbide). (Mainly fuel), it is inconvenient to reuse water directly by adopting the method of watering because it forms lumps and increases the water content.
As a cooling method of the pyrolysis residue, a rotating drum cooling method,
An indirect cooling (water-cooling) system was adopted for the vibration conveyor of the carrying-out and transfer system.

[0004]

The above-mentioned cooling method of the pyrolysis residue requires time, is expensive due to the indirect cooling means, has disadvantages in terms of cooling efficiency and equipment cost. Met. In addition, the pyrolysis residue taken out of the pyrolysis furnace contains char (carbide) and various non-combustible substances (including metal substances) mixed in the garbage, and both are integrated into a lump. Therefore, a process for separating and taking out both of them is required even if only natural cooling or indirect cooling is performed.

[0005] In view of the problems of the prior art, the present invention provides a method of cooling the pyrolysis residue upon reusing the pyrolysis residue from the pyrolysis furnace, which is excellent in cooling efficiency and at the same time as the char and other methods. It is an object of the present invention to provide a method for cooling a pyrolysis residue from a new pyrolysis furnace and a cooling device for the pyrolysis residue, which can simultaneously proceed with separation of the pyrolysis residue.

[0006]

According to the present invention, there is provided a method for cooling a pyrolysis residue from a pyrolysis furnace according to the present invention. A method of cooling a pyrolysis residue from a pyrolysis furnace, wherein a number of small-diameter steel balls 1 are added to and mixed with the high-temperature pyrolysis residue A, and the steel balls 1 and the pyrolysis residue A are mixed. By contact, the lump of the char A1 in the pyrolysis residue A is loosened, and the pyrolysis residue A is separated from the other residue A2 while being separated.
A step of transmitting the heat of the steel ball 1 to the steel ball 1, a step of separating the steel ball 1 and the pyrolysis residue A, and a refluxing step of cooling the steel ball 1 and then using it again in the initial step. That is the means to take.

In the method of the present invention, the steel ball 1 preferably has a diameter of 1 mm to 3 mm.

[0008] In order to achieve the above object, the apparatus for cooling a pyrolysis residue from a pyrolysis furnace according to the present invention includes a number of small-diameter steel balls 1 and the steel balls 1 on the high-temperature pyrolysis residue A. A vibrating drum 2 to be added and mixed; separating means 3 for separating the steel ball 1 and the pyrolysis residue A; cooling means 4 for cooling the steel ball 1; And a transfer means 5 for returning to the drum 2.

In the apparatus of the present invention, the steel ball 1 preferably has a diameter of 1 to 3 mm.

In the apparatus of the present invention, it is preferable that the separating means 3 is a magnetic attraction machine 3a.

In the apparatus of the present invention, the cooling means 4 is of an indirect water cooling type comprising a cylindrical body 4a through which the steel balls 1 pass and a water cooling jacket 4b provided around the cylindrical body 4a. Is preferred.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the method of the present invention, as a means for adding a large number of small-diameter steel balls 1 to the high-temperature pyrolysis residue A and mixing them, any suitable means may be used. And a vibrating drum or a rotary kiln used to remove foundry sand. Since the above-mentioned vibrating drum is usually provided with a means for cooling the drum main body, an effect of indirect cooling of the pyrolysis residue A can be expected also by this means.

In the case of a vibrating drum, the vibration required for dropping the foundry sand is generated. Therefore, the contact between the steel ball 1 and the pyrolysis residue A causes the formation of the char A in the pyrolysis residue A.
It is suitable to spread the heat of the pyrolysis residue A to the steel ball 1 while loosening the lump and separating it from the other residue A2. When only the steel ball 1 is separated from the pyrolysis residue A in the step of separating the steel ball 1 from the pyrolysis residue A, appropriate means, for example, a magnetic adsorber as in the embodiment is used. Thus, separation from the char A1 can be easily achieved.

However, in the pyrolysis residue A, in addition to the char A1, other residues A2, which are nonflammable foreign substances (metal products, pottery, etc.) contained in dust and the like, remain as they are. It is necessary to separate these steps simultaneously with or before or after the step of separating the steel ball 1, or to separate the step of separating the steel ball 1 and the step of separating the char A1 from the other residue that is a foreign substance. Whether to perform the separation into three steps of the separation step of A2 may be appropriately selected.

The recirculation step for cooling the steel ball 1 and then using it again in the initial step is performed by a suitable means, for example, a conveyer transferring means, a pneumatic conveying means, or a known means such as magnetic or electric means. It may be adopted as appropriate. The steel ball 1 preferably has a diameter of 1 mm to 3 mm, but generally, a steel ball used in shot blasting corresponds to this, so that it may be used as it is. However, other specially large steel balls 1
It is also possible to manufacture and use (for example, bearing balls and the like).

Since the steel ball 1 is used as a heating medium (media) for the pyrolysis residue A, a large amount of heat is efficiently absorbed from the pyrolysis residue A, and the temperature of the pyrolysis residue A is largely reduced. It can be lowered to about 80 ° C. Then, by cooling the steel ball 1 which has passed through the heat, the steel ball 1 is refluxed, and thus can be put into the pyrolysis residue A in the initial step again. The idea of using such a steel ball (for shot blast) as a heat medium can be said to be unique to the present invention.

Of course, when the steel balls 1 are introduced into the pyrolysis residue A by using a vibrating drum, the steel balls 1 come into contact with the pyrolysis residue A and cause friction. Unravel the lump of Char A1 inside, and Char A1
Has the effect of separating the char from the adhesion with the other residue A2, for example, the adhesion with a metal foreign matter, and also plays a role of promoting the separation of the char A1 as well as the heat medium.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method and apparatus for cooling a pyrolysis residue from a pyrolysis furnace according to the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 and 2, the cooling device for the pyrolysis residue from the pyrolysis furnace 13 is a cooling device for cooling a high-temperature pyrolysis residue obtained by pyrolysis of dust or the like, and has a large number of small diameters. Steel ball 1 (in the figure,
A vibrating drum 2 for adding the steel ball 1 to the high-temperature pyrolysis residue A (indicated by a dot in the drawing) and mixing while vibrating; and the steel ball 1 and the pyrolysis residue A A cooling means 4 for cooling the steel ball 1,
Transfer means 5 for returning the cooled steel balls 1 to the vibrating drum 2.

The above-mentioned vibrating drum 2 is known per se, and detailed description thereof will be omitted. Here, a principle diagram thereof is shown as a reference in FIG. In short, the vibration motor 2a
In addition, the drum body 2c is swung about its vibration center O through the resonance spring 2b.
d is an anti-vibration spring supported on the base. In general, the cooling tower 12 that cools the main body 2c with water is used.
a and a cooling means 12 comprising pumps 12b. Although not shown, the supplied thermal decomposition residue A is supplied to the vibrating drum 2 at 450 ° C. to 500 ° C.
Is charged with an inert gas, here a nitrogen gas, so as to prevent the char and the like in the pyrolysis residue A from burning due to the high temperature.

Reference numeral 6 denotes an infrared temperature monitoring means for detecting the thermal decomposition residue A from the vibration drum 2 and the outlet temperature of the steel ball 1 at 10
It is configured to detect whether the temperature has dropped to about 0 ° C. to 80 ° C., and to control the supply rate of the steel balls 1 to be increased if the temperature is high. The steel ball 1 has a diameter of 1.6 mm. This steel ball 1 has a diameter of 1
It is preferable to use one having a diameter of 3 mm to 3 mm. This steel ball 1 is 40 tons / hour for 2 tons / hour of the pyrolysis residue A.
It is supplied in quantitative cuts at a ratio of time.

At the outlet of the vibrating drum 2, a coarse sieving machine 7 is provided, through which the pyrolysis residue A such as char and the steel ball 1 are passed, and the coarse substance in the residue, metal fragments such as ceramic fragments and castings. An unburned material such as a product piece is taken out in advance, and the process is shifted to a rough material processing step. In addition to the coarse sieve 7, a fine sieve 8 is provided, and further sieves small pebbles or small residues having a diameter of about 3 mm or more and residues such as steel balls 1 and char.

The pyrolysis residue A such as char and the steel ball 1 which have exited the fine sieving machine 8 are transferred to the separating means 3. The separating means 3 is a two-stage magnetic adsorber 3 here.
a.3b is used. This is because the steel ball 1 is made into a cylinder that is rotatable around a fixed magnet, the pyrolysis residue A of a non-magnetic material such as char is dropped at a predetermined position, and the magnet is not present at a position rotated by a predetermined angle. , Steel ball 1 at that position
Are dropped, whereby the two are separated and taken out, and the structure itself is a known configuration as a range used for sorting casting sand or the like.

As shown in FIG. 1, the cooling means 4 here circulates cooling water in a chamber 4a through which the steel balls 1 pass, thereby cooling the steel balls 1 indirectly. A method of cooling from about 30 to about 40 ° C., that is, about room temperature is employed. The cooling water is connected to a cooling tower 4c via a pipeline and a tank 4b, and is circulated by pumps 4e and 4f. However, besides such an indirect water cooling method, the steel ball 1 may be dried directly by passing the steel ball 1 directly into water and then blowing high-speed air, thereby returning the steel ball 1 to the initial step. good.

The steel ball 1 that has exited the chamber 4a of the cooling means 4 is sent to a wind separator 9 and passes through a bag filter.
The blower 10 is configured to blow off fine powder such as char adhered to the steel ball 1 by the suction wind. Of course, a temperature drop can be expected by this air selection, and the temperature can be almost cooled to about room temperature, and thereafter, it is returned to the media tank 11 to reach an initial supply state.

The method for cooling a pyrolysis residue from a pyrolysis furnace for cooling a high-temperature pyrolysis residue obtained by pyrolysis of dust or the like according to the present invention is carried out in the following steps. First, a large number of small-diameter steel balls 1 are added to and mixed with the high-temperature pyrolysis residue, and the lump of char A1 in the pyrolysis residue A is loosened by contact between the steel ball 1 and the pyrolysis residue A, In addition, other residue A2
Heat of the pyrolysis residue A while separating the steel ball 1
To propagate. Next, the steel ball 1 and the pyrolysis residue A are separated. Then, the steel ball 1 is cooled and then refluxed again for use in the initial process.

When the heat of the above-described pyrolysis residue A is transmitted to the steel ball 1, a line design capable of lowering the temperature of the pyrolysis residue A to about 80 ° C. is performed. in this case,
The steel ball 1 having a diameter of 1.6 mm is used in a weight ratio to the pyrolysis residue A of 1:20, and the diameter of the steel ball 1 is 1 mm to 3 mm. It may be used, and its weight ratio is preferably in the range of 1:20. In addition, as a mixing means of the steel ball 1 and the pyrolysis residue A, a rotary giln can be used in addition to the vibrating drum 2 of the above embodiment.

[0027]

According to the method and apparatus of the present invention, when cooling the pyrolysis residue from the pyrolysis furnace, the steel ball is used as a heat medium, thereby reducing the conventional simple water cooling system or natural cooling system. Compared to this, there is an advantage that the cooling efficiency can be dramatically improved. In addition, the vibration mixing of steel balls and the pyrolysis residue dissolves the char of the pyrolysis residue and separates the char adhering to other residues. At the same time, and the subsequent separation of the char is facilitated.

Of course, since the steel ball is cooled and refluxed to the initial step, there is also an advantage that the cost is advantageous from the viewpoint of resource recycling. Other effects of the present invention are as described in detail in the above-mentioned embodiments and embodiments.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a device for cooling a pyrolysis residue used in a method for cooling a pyrolysis residue from a pyrolysis furnace according to the present invention.

FIG. 2 is a principle view of a vibrating drum used in a method for cooling a pyrolysis residue from a pyrolysis furnace according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel ball 2 Vibration drum 3 Separation means 3a Magnetic adsorption machine 4 Cooling means 5 Transfer means A Pyrolysis residue A1 Char A2 Other residue

Claims (6)

[Claims] 1. A method for cooling a pyrolysis residue from a pyrolysis furnace for cooling a high-temperature pyrolysis residue obtained by pyrolysis of dust or the like, wherein said high-temperature pyrolysis residue A is provided with a plurality of small-diameter steels. The ball 1 is added and mixed, and the mass of the char A1 in the pyrolysis residue A is loosened by the contact between the steel ball 1 and the pyrolysis residue A.
A step of transmitting the heat of the pyrolysis residue A to the steel ball 1 while separating it from the other residue A2; a step of separating the steel ball 1 and the pyrolysis residue A; and cooling the steel ball 1 And a refluxing step to be used again in the initial step, and a method for cooling the pyrolysis residue from the pyrolysis furnace. 2. The method for cooling a pyrolysis residue from a pyrolysis furnace according to claim 1, wherein said steel ball 1 has a diameter of 1 mm to 3 mm. 3. A cooling device for a pyrolysis residue which cools a high-temperature pyrolysis residue obtained by pyrolysis of dust or the like, comprising: a plurality of small-diameter steel balls 1; A vibrating drum 2 for adding and mixing steel balls 1; separating means 3 for separating the steel balls 1 and pyrolysis residue A; cooling means 4 for cooling the steel balls 1; 1. A cooling device for thermal decomposition residues, comprising a transfer means 5 for refluxing 1 to the vibrating drum 2. 4. The cooling apparatus for a pyrolysis residue according to claim 3, wherein said steel ball 1 has a diameter of 1 mm to 3 mm. 5. The apparatus according to claim 1, wherein the separating means is a magnetic attraction machine.
The cooling device for a pyrolysis residue according to claim 3 or 4. 6. The indirect water cooling system in which the cooling means 4 comprises a cylindrical body 4a through which the steel balls 1 pass, and a water cooling jacket 4b provided around the cylindrical body 4a. The cooling device for a pyrolysis residue according to claim 5.