JPH10325521A - Incinerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the generation of a harmful trace substance by properly supplying secondary combustion air to accomplish complete combustion of a thermal cracking gas with a higher mixing ability of the thermal cracking gas and residual oxygen contained in a combustion gas. SOLUTION: A first secondary combustion air supply section 6 is provided to supply secondary combustion air to a combustion gas G from a rotary kiln furnace 2 and a stoker furnace 3 downward right below a position near an outlet part 2b of the rotary kiln furnace 2 and a secondary combustion air supply section 8 is provided near an inlet part of a flue 5 successively arranged at an upper part of the stoker furnace 3 to supply the secondary combustion air to the combustion gas G frontally hitting it. As a result, the thermal cracking gas and residual oxygen contained in the combustion gas is given a stirring action to enhance mixing ability thereof with oxygen in the secondary combustion air. Thus, the secondary combustion of the thermal cracking gas in the combustion gas is completed, thereby enabling sufficiently restricting of the generation of the harmful trace substance such as dioxin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incinerator used for incineration of municipal refuse and waste, and more particularly, to a rotary kiln for drying and partially burning municipal trash and the like while rolling or sliding the object. The present invention relates to an incinerator in which a stoker furnace is connected to an outlet of a furnace for gasifying and burning a substance to be discharged from the rotary kiln furnace.

[0002]

2. Description of the Related Art In this kind of conventional general incinerator,
After the material to be burned put into the rotary kiln furnace is rolled or slid in the furnace with the rotation movement of the kiln itself, dried and partially burned, and is sequentially transferred to the outlet, and then transferred to the stoker furnace. Into the stoker furnace and gasified and placed in the stoker furnace, and discharged from the ash chute. It is discharged outside the furnace through the flue. Here, as the combustion air, only the primary combustion air is supplied, and the furnace temperature is adjusted by adjusting the supply amount of the primary combustion air.

[0003]

In the incineration in the above incinerator, the combustion gas generated in each of the rotary kiln furnace and the stoker furnace contains pyrolysis gas such as hydrocarbons and residual oxygen, These gases merge in the stoker furnace and flow to the flue.
Since only the primary combustion air is supplied, the pyrolysis gas and the residual oxygen cannot be sufficiently mixed, so that the outside of the furnace may be discharged without completing the secondary combustion, and as a result, There has been a problem in that hydrogen chloride and the like generated during the combustion of plastics and the like in waste are combined with pyrolysis gas to generate harmful trace substances such as dioxin.

[0004] The present invention has been made in view of the above circumstances, and by appropriately supplying the secondary combustion air, the mixing property between the pyrolysis gas contained in the combustion gas and the residual oxygen is increased to thereby improve the pyrolysis gas. It is an object of the present invention to provide an incinerator that can achieve complete combustion and suppress generation of harmful trace substances.

[0005]

In order to achieve the above object, an incinerator according to the first aspect of the present invention is a rotary kiln furnace that dries and partially burns while throwing or sliding an object to be burned. And a stoker furnace connected to an outlet of the rotary kiln furnace for gasifying and placing and burning the object to be burned. It is characterized in that a secondary combustion air supply section for supplying is provided.

[0006] According to the above configuration, by supplying secondary combustion air to the combustion gas from the rotary kiln furnace and the stoker furnace during the incineration treatment, the pyrolysis gas and the residual oxygen contained in the combustion gas are agitated. As a result, their mixing properties are enhanced, whereby the secondary combustion of the pyrolysis gas in the combustion gas is completed and the generation of harmful trace substances such as dioxin is suppressed.

[0007] In particular, as the secondary combustion air supply section,
As described in claim 2, a first secondary combustion air supply unit provided on an upper wall portion of the stoker furnace near the outlet portion of the rotary kiln furnace and supplying it directly below, and an upper portion of the stoker furnace. The second is provided in the vicinity of the entrance of the continuous flue and supplies the fuel gas in a state of frontal collision with the combustion gas.
By employing a configuration in which the secondary combustion air supply unit is provided in parallel, the pyrolysis gas and residual oxygen contained in the combustion gas from the rotary kiln furnace and the stoker furnace, respectively, are converted into the first secondary combustion air supply unit. Is dispersed and mixed via the secondary combustion air supplied from the second combustion air, and the secondary combustion air supplied from the second secondary combustion air supply unit collides with the dispersed and mixed combustion gas, and they are agitated. As a result, the mixing property between the oxygen in the secondary combustion air and the residual oxygen and the pyrolysis gas is enhanced, the secondary combustion of the pyrolysis gas becomes almost complete, and the generation of harmful trace substances can be further suppressed. It is possible.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing the entire structure of an incinerator according to the present invention. In the figure, an incinerator 1 has a rotary kiln 2 capable of rotating around its axis and an outlet 2b of the rotary kiln 2. And a stoker furnace 3 connected in a stepwise manner. The rotary kiln furnace 2 rolls an object to be burned, such as municipal waste, which is put into the furnace by a dust feed pusher (not shown) provided on the inlet 2a side in accordance with the rotation of the rotary kiln furnace 2 itself. Alternatively, it is transported toward the outlet 2b side while drying and partially burning while sliding.

At the bottom of the stoker furnace 3, a stoker 3 a for moving the dried and partially burned burned material introduced into the furnace from the outlet 2 b of the rotary kiln furnace 2 toward the discharge port 4 side. Is provided, and the stoker 3a
The combustion object moved by the gasification combustion and post-combustion while taking in the primary combustion air A1 from below the stoker 3a from below the stoker 3a to discharge the incinerated ash out of the furnace through the discharge port 4 and the combustion gas G is discharged to the outside of the stoker furnace 3 from a flue 5 connected to the upper part of the stoker furnace 3 as shown by an arrow.

In the incinerator 1 having the above-described basic configuration, the secondary combustion air A2-1 is supplied to the upper wall 3b of the stoker furnace 3 near the outlet 2b of the rotary kiln 2 and directly downward therefrom. A first secondary combustion air supply unit 6 to be supplied is provided, and near the inlet of a secondary combustion chamber 7 formed in a flue 5 connected to the upper part of the stoker furnace 3, A second secondary combustion air supply unit 8 is provided to supply the secondary combustion air A2-2 diagonally downward so as to cause the secondary combustion air A2-2 to collide with the combined combustion gas G from the front.

According to the incinerator 1 having the above-described configuration, during a series of incineration treatments of the burnable material such as drying and partial combustion in the rotary kiln 2 and gasification combustion and standing combustion in the stoker furnace 3. The pyrolysis gas and the residual oxygen contained in the combustion gas generated in the rotary kiln furnace 2 and the stoker furnace 3, respectively, and the secondary combustion air supplied from the first secondary combustion air supply unit 6 directly downward A2
-1 and the combustion gas G merged after the dispersion and mixing and the secondary combustion air A supplied obliquely downward from the second secondary combustion air supply unit 8.
2-2 is a head-on collision and is agitated, so that the oxygen in secondary combustion air A2-1 and A2-2 and the residual oxygen in combustion gas G are mixed with the pyrolysis gas in combustion gas G. Of the secondary combustion chamber 7 immediately before being discharged out of the furnace.
The pyrolysis gas is almost completely secondary-burned in the inside, and generation of harmful trace substances such as dioxin is suppressed.

In the above embodiment, the first and the second
Although the secondary combustion air supply units 6 and 8 have been described, the generation of harmful trace substances can be suppressed as compared with the related art even if only one of them is used.

[0013]

As described above, according to the present invention, by supplying secondary combustion air to the combustion gas from the rotary kiln furnace and the stoker furnace during the incineration treatment, the thermal decomposition contained in the combustion gas is provided. The gas and the residual oxygen can be agitated to enhance the mixing property between them and oxygen in the secondary combustion air. Therefore, the secondary combustion of the pyrolysis gas in the combustion gas can be completed and This produces an effect that generation of harmful trace substances can be sufficiently suppressed.

In particular, by adopting a configuration in which the secondary combustion air is supplied in two stages,
The secondary combustion of the pyrolysis gas in the combustion gas is made more complete, and the generation of harmful trace substances can be further suppressed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the entire structure of an incinerator according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 incinerator 2 rotary kiln furnace 2b outlet of rotary kiln furnace 3 stoker furnace 3b top wall of stoker furnace 6 first secondary combustion air supply section 8 second secondary combustion air supply section

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F23G 5/14 ZAB F23G 5/14 ZABF 5/20 ZAB 5/20 ZABA 5/44 ZAB 5/44 ZABF

Claims (2)

[Claims] 1. A rotary kiln furnace for drying and partially burning while throwing or sliding an input burnable material, and connected to an outlet of the rotary kiln furnace to gasify, place and burn the burnable material. An incinerator comprising a stoker furnace and a secondary combustion air supply unit for supplying secondary combustion air to combustion gas from the rotary kiln furnace and the stoker furnace. 2. A first secondary combustion air supply unit provided on an upper wall portion of a stoker furnace near an outlet of the rotary kiln furnace and supplying the secondary combustion air supply unit directly downward, 2. A second secondary combustion air supply unit, which is provided near an inlet of a flue and connected to an upper part of the stoker furnace and supplies the combustion gas with a state of frontal collision with the combustion gas. The incinerator as described.