JPH0429931B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an incineration method in a circular stirring incinerator, and is particularly characterized in that a large number of nozzle holes are provided at the bottom of the hearth, and fresh air is jetted out from the nozzle holes to make the hearth flow. It is something.

When incinerating materials to be incinerated, it is necessary to burn the entire material evenly in order to increase the incineration efficiency. Therefore, in a circular stirring incinerator, stirring blades are installed slightly above the hearth surface so that air hits the entire material to be incinerated, and a large number of stirring hands hang from the stirring blades. The device was inserted into the container and stirred, and by blowing air out of the stirring hand, air was blown onto the material to be incinerated. That is, in this system, air not only burns the material to be incinerated, but also has the function of cooling the stirring hand and preventing damage due to heat. Therefore, this air must have a low temperature, and preheated air cannot be used, so if the material to be incinerated has a high moisture content, this air must be used for combustion. Because the surface was cooled and sufficient combustion was not possible, the incineration efficiency was extremely low and auxiliary fuel oil was required.

The present invention eliminates the drawbacks of the conventional circular stirring incinerator described above, and minimizes the amount of air blown out from the stirring hand within the range that can cool the rotating shaft, stirring blades, and stirring hand. The remaining combustion air is supplied by heating fresh air through a number of nozzle holes provided at the bottom of the hearth to fluidize the hearth.

The present invention will be specifically described below based on illustrated embodiments. Reference numeral 1 in the figure is a circular incinerator body, in which an exhaust port 2 is formed in the upper part, a large number of nozzle holes 4 are provided in the bottom of the furnace, and a large number of blow holes 5 are provided in the side wall at the center of the furnace. A hearth 6 is formed by spreading sand or ash to an appropriate thickness at the bottom of the hearth. In addition, a rotating shaft 7 is erected at the center of the furnace bottom, and two or more stirring blades 8 are radially attached to the top of the rotating shaft 7, and each stirring blade 8 has a large number of stirring hands 9 facing downward. It is installed protrudingly. The stirring hand 9 stirs the material to be incinerated placed on the hearth 6 to improve contact with air, and its lower end reaches the hearth 6. Incidentally, the rotating shaft 7, stirring blades 8, and stirring hand 9 are all hollow and are electrically connected to each other.A blower 10 is connected to the rotating shaft 7, and a large number of blowholes 11 are bored in the stirring hand 9. By blowing out air from there, the stirring hand 9 is cooled and heat damage caused by heating is prevented. The air blown into the furnace through the nozzle hole 4 and the blowing hole 5 is heated by exchanging heat with, for example, the high-temperature exhaust gas discharged from the incinerator, and the high-temperature exhaust gas discharged from the exhaust port 2 is heated. It is led to the heat exchanger 12 as a heating medium.

When operating the circular stirring incinerator constructed in this way, the amount of air ejected from the stirring hand 9 is reduced as much as possible to the extent that the stirring hand 9 and the stirring blades 8 can be cooled to meet the required amount of air. The remaining air is heated and supplied from the nozzle hole 4 and the blowing hole 5. In particular, a large amount of air is blown out from the nozzle hole 4 to fluidize the hearth 6.

As detailed above, the present invention blows out fresh air from the stirring hand and blows out heated air from the hearth bottom to bring the hearth into a fluid state, and has the following effects.

(1) By providing an agitator in the furnace, the agitator 9 forcibly stirs and crushes the lumps of material to be incinerated that would not be moved by the fluidized air blowing out of the hearth, making it difficult to process in a fluidized incinerator. It is possible to dispose of bulk materials that cannot be incinerated.

(2) Incineration efficiency similar to that of a fluidized incinerator can be obtained by blowing out heated air from the nozzle hole 4 to fluidize the sand layer or ash layer that makes up the hearth, and as a result, high moisture sludge can be used as auxiliary fuel. It was possible to dispose of the waste by incineration without using it.

(3) Since the material to be incinerated is forcibly stirred by the stirring hand, the fluidizing air does not need to be strong enough to bring all the incinerated material into a completely fluid state.
The air velocity at the hearth can be reduced to about one-half to one-third of that of conventional fluidized incinerators.

(4) The temperature of the bed furnace is low at startup, but in this case, the material to be incinerated cannot be processed in a conventional fluidized bed incinerator, so the input of the material to be incinerated was postponed until the various conditions were met. In the incinerator of the present invention, the fluidized blowing air from the nozzle hole 4 is stopped, and the incineration operation can be performed only with the air ejected from the blowhole 11 of the stirring hand 9 on the fixed hearth.

When the temperature of the hearth 6 and the furnace wall rises, the temperature of the exhaust gas increases, and high temperature air can be obtained by heat exchange with this, the hearth 6 may be fluidized and operated. This makes it suitable for intermittent operation for several hours a day.

[Brief explanation of drawings]

The figure is a schematic diagram showing one embodiment of the present invention. 1... Incinerator body, 2... Exhaust port, 3... Furnace bottom, 4... Nozzle hole, 5... Inlet port, 6... Hearth, 7... Rotating shaft, 8... Stirring blade, 9... Stirring hand, 10... Blower, 11... Fumarole, 12...
Heat exchanger.

Claims (1)

[Scope of Claims] 1. A hollow rotating shaft is erected in the center of the furnace, several hollow stirring blades are attached radially to the top of the shaft, and the stirring blades are further equipped with several stirring hands with blowholes perforated therein. hanging down,
In a method of incinerating materials to be incinerated using a circular stirring incinerator equipped with a large number of nozzle holes and a hearth at the bottom of the hearth, approximately one-third of the required amount of air is ejected from the nozzle while stirring. An incineration method in a circular stirring incinerator characterized by stirring the material to be incinerated by hand and blowing out high-temperature air from a nozzle hole to bring the hearth into a fluid state.