JP2634057B2 - Manufacturing method of solid combustion aid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for supplying ash or dry sludge as an object to be processed to a self-weight descending path communicating with a combustion chamber in a waste melting furnace. And a method for producing a solid auxiliary material.

[Prior Art] Conventionally, it has been considered only to use a solid auxiliary material obtained by crushing municipal waste.

[Problems to be solved by the invention]

However, municipal garbage that has just been crushed has an apparent specific gravity smaller than that of ash or dry sludge. Municipal garbage is easy to collect without falling down, so not only does it not efficiently serve as a combustion aid in the waste melting furnace, but also causes the bridge phenomena caused by the collected municipal garbage on the gravity path of the object to be treated. Unnecessary air may enter the combustion chamber through the municipal waste due to a decrease in the sealing performance inside the interior, which may reduce the processing efficiency.

An object of the present invention is to provide a method for producing a solid combustion assisting material that does not reduce the treatment efficiency of an object to be treated in a waste melting furnace.

[Means for solving the problem]

The characteristic means of the method for producing a solid auxiliary material in the present invention is that, after crushing flammable waste containing plastic in municipal waste, compressing the flammable waste so that the apparent specific gravity becomes a value close to that of ash or dry sludge. The municipal waste is formed into pellets by heating and melting the plastic in the municipal waste as a binder, and the operation and effect are as follows.

(Operation)

In other words, the flammable municipal waste formed into pellets whose apparent specific gravity is close to the value of ash or dry sludge is supplied to the to-be-processed material's own weight descending path together with the ash or dry sludge as a solid combustion aid, and In the descending path, it is easy to descend by its own weight at the same time as the ash or dry sludge, so that the sealing property in the combustion chamber is not reduced, and the municipal garbage can be prevented from collecting at the upper part, and the ash or dry sludge and the Pelletized municipal garbage mixes well with fuel in the combustion chamber to help it efficiently.

〔The invention's effect〕

Therefore, while efficiently utilizing municipal garbage as the solid combustion aid, the processing efficiency in the waste melting furnace could be improved economically.

〔Example〕

 Next, embodiments of the present invention will be described with reference to the drawings.

As a method of treating municipal garbage, general combustible garbage including garbage in municipal garbage is converted into incinerated ash in a stoker-type incinerator (1) with an in-furnace temperature of 950 ° C or less, and then filled with objects to be treated. An object-to-be-processed own-weight descending path (2) for lowering its own weight in a state
In addition, slag is formed by melting treatment in a waste melting furnace (4) having a combustion chamber (3) connected and connected over the entire circumference thereof. After crushing to the size of about 400mm square by (5), irons are separated by primary magnetic separator (6), and further separated into combustibles and non-iron incombustibles such as metals or ceramics by screening (7). Then, the incombustibles are supplied to a waste melting furnace (4), and the combustibles are again separated from irons by a secondary magnetic separator (8), and the residue is separated by a twin screw extruder (9). Combustible waste with an apparent specific gravity of about 0.1 is approx.
While being compressed to a value of 0.4, a round rod-shaped product having a diameter of 10 mmφ to 30 mmφ is extruded from the tip die plate and cut into pellets by cutting to a length of about 50 mm while being extruded. It is supplied to the treated material's own weight descending path (2) together with the incineration ash as a solid combustion aid.

In the twin-screw extruder (9), frictional heat is generated as the combustible waste is compressed only by heating with a heater in the initial operation, and the plastic in the combustible waste is melted by the frictional heat. And acts as a binder for pelletizing.

The bulky garbage or unsuitable for incineration was directly dumped in a landfill, etc., but the solid combustion aid pelletized from this has a low water content and contains plastic, so it is 3000 to 6000 kcal / kg. It has a high calorie content and can be sufficiently used as an oil substitute fuel for an auxiliary material such as kerosene in a waste melting furnace (4).

The irons separated by the primary magnetic separator (6) and the secondary magnetic separator (8) are sold as scrap iron.

(Another embodiment)

The shape of the pellets may be other shapes besides the round bar shape.Also, in order to pelletize, the combustible waste is always directly heated by a heater or the like, and the contained plastic is melted as a binder. May be.

The material to be treated in the waste melting furnace (4) may be dry sludge other than municipal waste incineration ash.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

The drawing is a schematic view showing an embodiment of the method for producing a solid auxiliary material according to the present invention. (2) …………………………………………………………………………….
(4) ... waste melting furnace.

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Claims (1)

(57) [Claims] A combustion chamber (3) in a waste melting furnace (4)
A method for producing a solid combustion aid for supplying to a treatment object own weight descending channel (2) with ash or dry sludge as a treatment object, the method comprising: removing combustible waste containing plastic in municipal waste. After crushing, the fixed auxiliary combustion material for molding the municipal garbage into pellets by heating and melting the plastic in the combustible waste as a binder while compressing so that the apparent specific gravity becomes a value similar to the ash or the dried sludge. Manufacturing method.