JPS5840089B2 - waste melting furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a combustion chamber with a waste material supply path connected to the entire circumference of the combustion chamber, and a gas discharge path and molten material removal path connected to the bottom center of the combustion chamber. Regarding melting furnaces.

The above-mentioned furnace is configured to burn and melt waste mainly through width-based heat transfer from high-temperature gas in the combustion chamber, but the present invention utilizes the radiation heat transfer effect in an extremely rational and economical manner. By improving fuel efficiency, we will be able to achieve significant fuel savings.
As a means to enhance the radiant heat transfer effect, the water treatment sludge itself, which should normally be incinerated, can be effectively used to achieve both sludge treatment and fuel consumption savings, thereby improving waste treatment. The purpose is to enable the extremely important economic operation of the reactor.

A characteristic feature of the waste melting furnace according to the present invention is that in order to form a bright flame in the combustion chamber, a device is provided for mixing dry and pulverized water treatment sludge into the waste in the material supply path. This configuration provides the following effects.

In other words, since the device is equipped with a device that mixes dry, pulverized water treatment sludge with waste, the pulverized water treatment sludge, which is thrown into the combustion chamber along with the waste, is fanned by the flame of the burner. In addition to the fact that the water treatment sludge generally contains a large amount of organic components, this fine powder water treatment sludge forms a bright flame in the combustion flame, and as a result, Radiation heat transfer from the high-temperature gas in the combustion chamber to the processed material can now be carried out extremely efficiently, and therefore the amount of fuel required to provide heat from the outside can be greatly reduced, placing emphasis on economic efficiency. An extremely useful melting furnace for waste treatment has now been obtained.

Moreover, as a means to form a luminous flame in this way,
Rather than using special combustion aids, the water treatment sludge itself, which should normally be incinerated, is effectively used, which not only further reduces the amount of fuel consumed, but also treats the sludge at the same time. It has the advantage of being able to be done.

Furthermore, when mixing water treatment sludge with the waste, it is also possible to supply fine powder water treatment sludge to the air supply path to the combustion burner, for example, but compared to such a method, The present invention is also advantageous in that it can avoid drawbacks such as the occurrence of clogging due to the adhesion of thermally burned residue of water treatment sludge to the burner nozzle.

Embodiments of the present invention will be described below based on the drawings.

A combustion chamber 3 having a conical heat reflecting wall 1 and a burner 2 disposed downward in the center thereof is connected with a supply path 4 for descending the weight of the material to be processed over its entire circumference. A plurality of input hoppers 5 are provided, and various industrial wastes such as city garbage, its heat-treated products, or molded dried sludge generated from water treatment such as sewage are filled and lowered into the supply channel 4. It is configured to supply the fuel directly to the combustion chamber 3.

A device 6 is provided for supplying sludge generated by water treatment such as sewage to a hopper 5 in the form of dry fine powder and mixing it with the waste in the supply path 4. The treated sludge is constructed so that it burns with an extremely high calorific value and floats in the flame, forming a bright flame with extremely high radioactivity, making it a type of waste that should originally be melted and treated. By an extremely rational and economical means that makes effective use of water treatment sludge, it is configured to melt waste only by self-combustion, or to melt it while greatly reducing the amount of heat generated from burner 2. It is.

In the center of the furnace bottom wall 7 extending from the combustion chamber 3 to the lower part of the supply path 4,
The gas discharge path/melt removal path 8 is connected, and the furnace bottom inner surface 1a is formed into a conical shape with the center side lowered, and the furnace bottom wall 7 is connected.
is configured to rotate by a drive device 9, and thereby,
The waste from the supply path 4 is moved along the inner surface 7a of the furnace bottom into the combustion chamber 3, where it is burned and then melted to be destroyed, and the molten material and combustion gas are discharged downward. It is configured as follows.

A post-combustion chamber 11 equipped with an auxiliary burner 10 is connected to the outlet passage 8, a horizontal flue 12 is connected to the post-combustion chamber 11, a cooling water tank 13 is provided below the post-combustion chamber 11, and the combustion gas is The unburned suspended matter is completely combusted and then sent to the flue 12, and the molten matter is cooled and solidified.

As illustrated in FIG.
The direction of ejection is set close to the tangential direction of the inner circumference,
As shown in FIG. A checker 14 is provided near the inlet of the exhaust gas to ensure complete combustion of gas and unburned substances, thereby ensuring that odor pollution and dust pollution caused by exhaust gas discharge into the atmosphere are prevented as a whole. It is constructed in such a way that it can be prevented.

A catch 15 is provided in the cooling water tank 13 in a state submerged near the water surface, and the catch 15 is moved by a drive device 16.
The molten material is configured to be rotatable around the horizontal axis 11, and the molten material is cooled as slowly as possible on the receiver 15, thereby suppressing the atomization of the solidified material, and also suppressing the fineness of the solidified material. It is configured to suppress the generation of steam from the water tank 13, and further, if a suitable amount of solidified material is a sound source on the receiver 15,
The structure is such that the solidified material can fall into the water tank 13.

In addition, as shown in FIG. 4, a float 18 is connected to the catch 15 to raise and lower it according to changes in the liquid level in the water tank 13, and the distance between the catch 15 and the first drive device 16 is changed. is constructed so as to be permitted by the action of the tension wheel 20 on the winding transmission device 13 that interlocks both 15 and 16, and the above-mentioned solidified fine particles are always removed by the catch 15 regardless of the liquid level in the water tank 13. The structure is such that suppression of oxidation and vapor generation can be effectively performed.

Furthermore, a belt conveyor 21 and a hopper 22 are provided to collect the solidified material in the water tank 13 into a container 24.

[Brief explanation of the drawing]

The drawings show an embodiment of the waste melting furnace according to the present invention.
The figure is a schematic longitudinal cross-sectional view, the second figure is a cross-sectional view of the after-combustion chamber, and the third figure is a cross-sectional view of the after-combustion chamber.
FIG. 4 is a perspective view of the main part of the flue, and FIG. 4 is a longitudinal cross-sectional view of the cooling device. 3... Combustion chamber, 4... Processing material supply path, 8... Gas discharge path/melt material removal path, 6...
...A device that mixes dry, pulverized water treatment sludge.

Claims (1)

[Claims] 1 A to-be-processed material supply path 4 is provided in the combustion chamber 3 over its entire circumference.
A waste melting furnace is provided in which a gas discharge passage and melt extraction passage 8 is connected to the bottom center of the combustion chamber 3, and in order to form a bright flame within the combustion chamber 3, A waste melting furnace characterized in that a device 6 for mixing dry, pulverized water treatment sludge into the waste in the material supply path 4 is provided.