JP3635139B2 - Waste treatment furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary kiln for incinerating various industrial wastes, a waste incinerator composed of a stalker furnace and a secondary combustion chamber.
[0002]
[Prior art]
Conventionally, a waste incinerator including a rotary kiln, a stalker furnace, and a secondary combustion chamber is known as an incinerator for industrial waste such as waste plastic, oily soil, and sludge (see, for example, Japanese Patent Publication No. 4-65289). FIG. 3 is a longitudinal sectional view of the waste incinerator. The waste in the waste charging hopper 1 is charged into the rotary kiln 3 by the pusher 2.
[0003]
In rotary kiln 3, in order to suppress the formation of clinker in the furnace, from the burning in suppressing the combustion state, mainly containing unburnt gas and carbon of 800 to 850 ° C containing CO and H ₂ 800 to 850 A residue of ° C is generated, and unburned gas flows into the secondary combustion chamber 5 disposed on the rotary kiln outlet side 3a and the inlet side 4a of the stalker furnace 4, and the residue is a grate 4b on the stalker furnace inlet side 4a. Discharged to the top.
[0004]
In the stalker furnace 4, air for active combustion is blown for the purpose of complete combustion, and the residue is burned by raising a flame on the grate 4b, and exhaust gas containing O _{2 in} excess air is generated. This exhaust gas is mixed with the unburned gas generated in the rotary kiln 3 in the secondary combustion chamber 5 and burned. The incinerated residue falls to the ash removal device 6 and is taken out of the system as incinerated ash.
[0005]
[Problems to be solved by the invention]
However, the residue on the outlet side of the rotary kiln is melted to a high temperature due to contact between the radiant heat from the stalker furnace and the combustion exhaust gas and the radiant heat generated by the combustion of the unburned gas, and a clinker is generated, making it impossible to operate the rotary kiln. Therefore, the equipment is periodically stopped and clinker is removed.
[0006]
SUMMARY OF THE INVENTION The present invention provides a waste incinerator comprising a rotary kiln, a stalker furnace, and a secondary combustion chamber, wherein the generation of clinker in the rotary kiln is reduced.
[0007]
[Means for Solving the Problems]
The present invention relates to a waste incinerator in which a stalker furnace is provided in parallel on the outlet side of a rotary kiln, and formed so that the rotary kiln exhaust gas and the stalker furnace exhaust gas merge in the secondary combustion chamber. This is a waste incinerator characterized in that a partition wall is provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a longitudinal sectional view of an incinerator composed of a rotary kiln, a stalker furnace and a secondary combustion chamber according to the present invention. An incinerator composed of a rotary kiln, a stalker furnace and a secondary combustion chamber to which the present invention is applied Since it is the same structure as the conventional incinerator shown in FIG. 3, since the description overlaps, it abbreviate | omits. In the present invention, a partition wall 7 is disposed in the vicinity of the exit side 3 a of the rotary kiln 3 at right angles to the axial direction thereof.
[0009]
FIG. 2 is an explanatory view of the rotary kiln exit side and the vicinity of the stalker furnace entry side. The partition wall 7 is disposed on the stalker furnace entry side 4a at an appropriate interval from the rotary kiln exit side 3a, and the water cooling pipe 7a is an iron skin 7b. Since the radiant heat from the stalker furnace 4 is blocked by the partition wall 7, the flammable unburned gas generated in the rotary kiln 3 is not burned between the rotary kiln 3 and the partition wall 7 without burning. And then flows into the secondary combustion chamber 5 where it is mixed with the exhaust gas containing O _{2 in} excess air from the stalker furnace 4 and burned.
[0010]
Further, the residue on the rotary kiln outlet side 3a falls to the inlet side 4a of the stalker furnace 4, combustion air is blown in the stalker furnace 4, and the residue burns by raising a flame on the grate 4b, and excess air. Exhaust gas containing a minute amount of O ₂ is generated, and the exhaust gas rises to the secondary combustion chamber 5 and is mixed with combustible unburned gas generated in the rotary kiln 3 to burn the unburned gas. The radiant heat is blocked by the partition wall 7 and the exhaust gas in which the excess air O ₂ remains is blocked from flowing into the outlet side 3a of the rotary kiln 3 to prevent melting of the residue on the rotary kiln outlet side 3a, thereby preventing the generation of clinker. Is done.
[0011]
【The invention's effect】
The effects of the present invention are as follows.
[0012]
(1) By providing a refractory partition wall, the radiant heat from the stalker furnace to the outlet side of the rotary kiln is shut off, and the control combustion residue on the rotary kiln outlet side with respect to the exhaust gas containing O ₂ from the stalker furnace. Therefore, the residue does not burn and reach a high temperature, so that clinker generation at the outlet of the rotary kiln can be prevented.
[0013]
(2) Since the rotary kiln and the stalker furnace can be individually controlled by providing the partition walls, the operation of the incinerator is facilitated.
[0014]
(3) Since the partition wall has a refractory-coated structure, heat removal from the atmosphere can be minimized, so that there is little influence on the residue combustion characteristics on the stoker furnace grate.
[0015]
(4) Since clinker generation on the rotary kiln exit side can be prevented, long-term stable operation of the incinerator becomes possible.
[0016]
(5) Since the corrosive gas such as HCl in the rotary kiln exhaust gas can be prevented from flowing into the high temperature space above the stalker furnace, the durability against low temperature corrosion and high temperature corrosion of the heat exchange device disposed in the high temperature space is improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a waste incinerator comprising a rotary kiln, a stalker furnace and a secondary combustion chamber according to the present invention.
FIG. 2 is an explanatory view of the vicinity of the exit side of the rotary kiln and the stalker furnace entrance side according to the present invention.
FIG. 3 is a longitudinal sectional view of a waste incinerator comprising a conventional rotary kiln, stalker furnace and secondary combustion chamber.
[Explanation of symbols]
1 charging hopper, 2 pusher, 3 rotary kiln, 3a rotary kiln exit side, 4 stalker furnace, 4a stalker furnace entrance side, 4b grate, 5 secondary combustion chamber, 6 ashing device, 7 bulkhead, 7a water-cooled pipe, 7b iron leather

Claims (1)

In a waste incinerator with a stalker furnace installed side by side on the outlet side of the rotary kiln and formed as the rotary kiln exhaust gas and stalker furnace exhaust gas merge in the secondary combustion chamber, a vertical partition is placed near the connection between the rotary kiln and the stalker furnace. A waste incinerator characterized by having been installed.

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