JP3046776B2 - Driftwood and garbage disposal method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating driftwood and dust collected from a dam of a hydroelectric power plant.

[0002]

2. Description of the Related Art In addition to driftwood from upstream, trash such as vegetation, plastic bottles, and garbage are collected from dams and the like of hydroelectric power plants. Conventionally, all of these collected materials were incinerated in an incinerator.However, there is a problem in that a large amount of fuel is required for incineration of highly watery collected materials, and all valuable resources such as driftwood are also incinerated. there were.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems in the prior art.
The present invention has been made to provide a method for treating driftwood and garbage which is excellent in economical efficiency and can be recovered as valuable resources by carbonizing the driftwood.

[0004]

DISCLOSURE OF THE INVENTION In order to solve the above-mentioned problems, a method for treating driftwood and refuse according to the present invention has a structure in which a rotary furnace for refuse incineration can be switched between oxygen-excess combustion and oxygen-suppressed combustion. The waste is incinerated in this rotary furnace by excess oxygen combustion, while the driftwood is crushed to a predetermined size in advance, dried to a predetermined moisture, then put into the rotary furnace, and carbonized by oxygen-suppressed combustion. Things. In this case, it is preferable that a piece of the driftwood be crushed to a size of 15 to 50 mm and dried until the water content becomes 40% or less, and combustible gas generated during carbonization be burned and used for drying. Is preferred.

According to the method for treating driftwood and refuse of the present invention, refuse can be incinerated and driftwood carbonized using the same rotary furnace, and the driftwood can be collected as valuable resources. Moreover, by using the combustible gas generated at the time of carbonization for drying, the amount of fuel used can be reduced, and waste of energy can be eliminated.

[0006]

Next, preferred embodiments of the present invention will be described. FIG. 1 is a flow sheet showing the configuration of equipment used in the present invention, and 1 is a rotary furnace used for incineration of garbage and carbonization of driftwood. As shown in FIG. 2, the rotary furnace 1 includes a cylindrical furnace body 3 supported by rollers 2 and a burner 4 capable of performing oxygen excess combustion and oxygen suppression combustion. Further, the furnace body 3 has a structure in which the amount of leaked air is small, so that not only can the refuse introduced from the end of the furnace body 3 be incinerated by the excessive oxygen combustion while rotating, but also the burner 4 can be burned by the oxygen-suppressed combustion. And carbonization of driftwood introduced from the end of the furnace body 3 is also possible. In addition, an afterburner 5 that burns combustible gas (carbonized gas) generated during carbonization is provided on the upper part of the furnace body 3. The method for treating driftwood and dust according to the present invention will be described below with reference to the flow sheet of FIG.

First, driftwood and dust collected from a dam of a hydroelectric power plant are collected in a temporary storage place and separated into driftwood and dust. Generally, driftwood has an apparent specific gravity of 0.2 to 0.3 and moisture
Garbage has an apparent specific gravity of about 0.2,
60-70%. The garbage is crushed by a crusher 6 if necessary, dried by a rotary dryer 7 and then
And burner 4 is burned as usual with excess oxygen combustion. At this time, heavy oil is supplied to the burner 4 of the rotary furnace 1 from the fuel tank 8, and combustion air is supplied from the combustion air fan 9. The incinerated ash is taken out to the ash hopper 11 via the ash transfer conveyor 10.

On the other hand, the driftwood is crushed to a predetermined size by the crusher 6 in order to uniformly carbonize and shorten the carbonization time. As the crusher 6, for example, a two-axis roll crush type is used, and one piece is 15 to 50 as described later.
Crushing to a size of mm is preferred. Thereafter, drying is further performed by a rotary drier 7 until the water content becomes preferably 40% or less. Hot air is sent from the hot air generator 12 to the dryer 7.

The driftwood thus crushed and dried in advance is put into the rotary furnace 1, and the burner 4 is carbonized as oxygen-suppressed combustion. At this time, the driftwood is uniformly heated while being rotated, and carbonization proceeds from the surface. Thereafter, the carbide is taken out to the ash transfer conveyor 10 and subjected to water spray. The progress of the carbonization is stopped, and the carbide is taken out to the ash hopper 11. The combustible gas generated during the carbonization is burned by the afterburner 5 as described above, and the obtained high-temperature combustion gas is dried by the dryer 7.
And used for drying. The exhaust gas from the afterburner 5 and the dryer 7 is processed by the cyclones 13 and 14 and then exhausted from the exhaust pipe 15.

As described above, according to the present invention, refuse is incinerated and driftwood is carbonized by the same rotary furnace 1 to obtain valuable charcoal. Table 1 below shows the effect of the size of the driftwood on carbonization, and Table 2 shows the effect of the water content on carbonization. From these data, the crush size of driftwood is preferably 15 to 50 mm,
It is understood that the content is preferably set to 40% or less.

[0011]

[Table 1]

[0012]

[Table 2]

[0013]

As described above, according to the method for treating driftwood and refuse of the present invention, refuse collected from a dam of a hydroelectric power plant is incinerated, and the driftwood is removed using the same rotary furnace. It can be carbonized to obtain useful charcoal. For this reason, there is an advantage in that it is more economical than a conventional treatment method in which all of them are uniformly incinerated, and energy can be reduced by using a combustible gas generated during carbonization for drying.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing a configuration of a device used in the present invention.

FIG. 2 is a perspective view of a rotary furnace used in the present invention.

[Explanation of symbols]

1 rotary furnace, 2 rollers, 3 furnaces, 4 burners, 5
Afterburner, 6 crusher, 7 tumble dryer, 8
Fuel tank, 9 combustion air fan, 10 ash transfer conveyor, 11 ash hopper, 12 hot air generator, 13 cyclone,
14 cyclones, 15 exhaust stacks

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification code FI B09B 3/00 303M (58) Fields investigated (Int. Cl. ⁷ , DB name) F23G 5/033 ZAB B09B 3/00 ZAB F23G 5/04 ZAB F23G 5/20 ZAB

Claims (3)

(57) [Claims] A rotary furnace for incineration of refuse is provided with a structure capable of switching between excess oxygen combustion and oxygen-suppressed combustion. Dust is incinerated in this rotary furnace by excess oxygen combustion, while the driftwood is crushed to a predetermined size in advance. A method for treating driftwood and refuse, further comprising drying the water to a predetermined moisture, charging the water into the rotary furnace, and carbonizing by oxygen-suppressed combustion. 2. A driftwood piece is crushed to a size of 15 to 50 mm and further dried until the water content becomes 40% or less.
The method for treating driftwood and garbage according to the above. 3. The method for treating driftwood and refuse according to claim 1, wherein the combustible gas generated during carbonization is burned and used for drying.