JP3921279B2 - Waste incinerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of an incinerator for an object to be treated such as dewatered cake of high-water sludge from municipal sewage or factory effluent.
[0002]
[Prior art]
Conventional waste incinerators include those described in, for example, registered utility model publications Nos. 3021466 and 3021467.
These incinerators are provided with a plurality of crushing blades suspended from an air supply pipe having a plurality of combustion air nozzles on the rotary hearth, and the combustible that rotates with the hearth hits the crushing blades and Part is disintegrated, new surface is exposed, burned and discharged from the central outlet to incinerate medical waste and kitchen waste.
[0003]
[Problems to be solved by the invention]
In the above-mentioned conventional incinerator, for example, the processed material such as dewatered cake of high-water sludge from municipal sewage or factory wastewater is insufficiently dried and combusted, and the processed material is partially solidified into a clinker shape during combustion. The complete combustion in the furnace is difficult, and the furnace may be blocked.
In contrast, an object of the present invention is to obtain a waste incinerator capable of efficiently drying an object to be treated such as a dehydrated cake in a furnace and promoting combustion.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, in the first aspect of the invention, a circular rotary hearth that is rotatable around the rotation center at the lower bottom portion of the incinerator main body having the exhaust gas discharge port and the workpiece supply part at the upper end, A pair of hollow duct-shaped agitation shafts fixed to the incinerator main body perpendicularly with the rotation center as an intersection above the rotary hearth, and the respective agitation shafts in a direction opposite to the rotation direction of the rotary hearth A plurality of combustion air outlets that are open from the horizontal to the bottom and a plurality of air outlets that are alternately inclined inward and outward with respect to the rotation direction of the rotary hearth and that are fixed with a slight gap from the upper surface of the rotary hearth A plate-shaped guide blade, a combustion air intake port connected to the end of the one stirring shaft, and an ash discharge port disposed in the center of the rotary hearth, from the workpiece supply unit The object to be treated supplied on the rotary hearth is rotated by the rotary hearth and the guide blades. It was solved by waste incinerators that are capable combustion while moving to the ash discharge outlet in a zigzag.
According to a second aspect of the present invention, in the waste incinerator according to the first aspect, the upper surface of the rotary hearth is suspended from one end of the stirring shaft in the vicinity of the workpiece supply position to the upper surface of the rotary hearth. Waste comprising a lowered chain-like stirring chain and / or one guide vane fixed to the outermost part of the other end of the stirring shaft so as to scrape the workpiece on the outer periphery of the rotary hearth An incinerator is preferred.
According to a third aspect of the present invention, in the waste incinerator according to the first or second aspect, the workpiece supply unit includes a cylindrical bowl and a vertical screw that is rotatably supported from above in the bowl. And a processing pipe having a narrow diameter side of a throttle pipe which is connected to the inlet pipe and has a narrowed cross-section connected to the inlet pipe, and is to be processed horizontally. It is preferable to provide a waste incinerator that includes a material supply pipe and that can be dropped into the furnace while cutting the object to be processed into small blocks.
According to the invention of claim 4, in the waste incinerator according to any one of claims 1 to 3, a waste incinerator in which the lower end portion of the guide blade is a curved surface can be provided.
According to the fifth aspect of the present invention, in the waste incinerator according to the fourth aspect, the curved surface of the guide blade can be a waste incinerator having a bowl or bowl-shaped tip.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a partial longitudinal sectional view showing an entire example of a waste incinerator of the present invention.
FIG. 2 is a schematic plan view of the rotary hearth of the waste incinerator of FIG. 1 viewed in the B / B direction.
FIG. 3 is a schematic side view showing another example of guide vanes of the waste incinerator of the present invention.
FIG. 4 is a schematic explanatory view of a stirring shaft portion of the waste incinerator of FIGS.
FIG. 5 is a schematic side view of the stirring chain portion of the waste incinerator of FIGS.
FIG. 6 is a partial longitudinal sectional view showing a screw feeder of the waste incinerator of FIGS.
[0006]
The waste incinerator 1 of the present invention is on a frame 18 in which an outer peripheral circular rotary hearth 3 is connected to the lower bottom of a substantially cylindrical incinerator body 4 standing on a base 17 on a foundation. The drive unit 6 can be rotated in the rotation hearth rotation direction X in the clockwise direction when viewed from above with the rotation center O as the center, and is supported horizontally on the surface portion. The stirring shaft 2 is fixed to the incinerator main body 4 perpendicularly with the rotation center O as an intersection with a space above the rotary hearth 3.
Further, the incinerator body 4 has an exhaust gas discharge port 16 and a workpiece supply unit to be described later at the upper end, an auxiliary burner 5 at the upper side, combustion air intakes 12a and 12a to the stirring shaft 2 at the lower side, and an incinerator at the side. Combustion air intakes 12b and 12b into the main body 4 are respectively provided. An ash discharge port 10 whose lower end is connected to an ash cooling and transporting device (not shown) is disposed at the center of the rotary hearth 3, and an edge is projected around the ash discharge port 10 of the rotary hearth 3. Yes.
The agitation shaft 2 has a hollow duct shape, and a combustion air intake agitation shaft 2a having cooling air intakes 12a and 12a connected to both ends thereof and a combustion air distribution agitation shaft 2b are communicated at an intersection. Yes. The stirring shafts 2a and 2b are fed from the combustion air intake ports 12a and 12a through the stirring shafts 2a and 2b in the combustion air blowing direction Y in the direction opposite to the rotation direction X of the rotary hearth 3 and from the horizontal to the downward direction. A large number of opening combustion air outlets 11 through which the incoming combustion air can be blown are formed.
[0007]
As shown in FIG. 2, the stirring shaft 2 a is rotated in the rotational direction X as viewed from above so that the workpieces W ₂ and W ₄ are brought inside the ash discharge port 10 by the rotation of the rotary hearth 3 in the rotational direction X. Each of the two flat plate-like guide blades 7b and 7d inclined inward is fixed with a gap, and the lower ends of the guide blades 7b and 7d are substantially parallel to the upper surface of the rotary hearth 3 and have a slight gap. The workpiece can be turned over. Further, a chain-like stirring chain 8 suspended at one end of the stirring shaft 2a is fixed to a length that allows the terminal to be dragged on the upper surface of the rotary hearth 3, and a block-like object to be processed by the dragging action of the stirring chain 8 Is unraveled. One guide vane 7e is fixed to the other end portion of the stirring shaft 2a to scrape the outer peripheral portion of the rotary hearth 3 with an interval on the outermost side of the guide vane 7d. The direction of the guide vane 7e may not be the same as that of the guide vane 7d. Here, the stirring chain 8 and / or the guide vane 7e need not necessarily be mounted.
As shown in FIG. 2, the stirring shaft 2 b is rotated in the rotational direction X as viewed from above so that the workpieces W ₃ and W ₅ are moved to the outside of the ash discharge port 10 by the rotation of the rotary hearth 3 in the rotational direction X. Each of the two flat plate-like guide blades 7a and 7c inclined outward is fixedly spaced, and the lower ends of the guide blades 7a and 7c are substantially parallel to the upper surface of the rotary hearth 3 and have a slight gap. The workpiece can be turned over.
The guide blades 7a, 7b, 7c, and 7d have been described as two each, but a plurality of guide blades may be appropriately selected according to the form of the object to be treated and / or the diameter of the waste incinerator.
[0008]
Below, other optional components of the waste incinerator 1 will be described.
As shown in FIGS. 1 and 6, a screw feeder 9 and a workpiece supply pipe 13 are fixed to the upper end portion of the incinerator main body 4 as a workpiece supply portion. The screw feeder 9 is pivotally supported by an upper drive unit 15 so as to be able to rotate in a cylindrical bowl 9a and a bowl 9a that are long in the direction Q of dropping the workpiece in the direction of gravity with a workpiece inlet 9c opened at the lower end. In addition, a workpiece supply pipe 13 is horizontally placed on the upper side of the flange 9a. The workpiece supply pipe 13 includes an inlet pipe 13a in which a supply pump (not shown) is connected to a workpiece supply source, and a throttle pipe 13b having a narrowed section, and the supply pipe 13a and the throttle pipe 13b are connected to each other. In addition, the narrow diameter side of the throttle tube 13b is placed on the upper side of the cylindrical rod 9a. Depending on the form of the workpiece, the workpiece supply unit may simply have a configuration in which a pipe from the supply pump is connected to the workpiece supply source.
As shown in FIG. 3, the guide blades 7a, 7b, 7c, and 7d are replaced with flat plate-shaped guide blades 7a ′ having a curved surface on the upper surface of the rotary hearth 3 with a gap as shown in FIG. 7b ', 7c', 7d 'can be arranged. Various shapes can be selected as the shape of the curved surface according to the shape of the object to be processed. For example, a part of arc, ellipse, fence line, etc. Is used. In the case of an object to be processed that usually tends to be a lump, it is desirable that it has a curved surface shape, particularly a heel or a heel tip shape, so that a strong turning action is possible.
[0009]
Next, the operation of the waste incinerator 1 will be described.
The water content of treated objects such as dewatered cake of high moisture sludge such as municipal sewage or factory effluent usually reaches 80%. In order to efficiently burn the material to be treated, the surface area can be expanded evenly by crushing the dehydrated cake into small lumps so that it does not become as large as possible during the drying process in order to accelerate the drying of the dehydrated cake. The waste incinerator 1 achieves these by the above-mentioned configuration.
In FIG. 2, the workpiece W ₁ introduced from the workpiece supply unit into the furnace A from the outside first falls in the rotating hearth 3 rotating at a low speed of 0.2 to 0.5 rpm, for example, in the rotation direction X. and is placed in the position of the workpiece W ₂ of outward,引摺is a rotary hearth 3 top by a terminal of the stirring shaft 2a chained stirring chains 8 which are suspended from one end and is crushed into small lumps. Next, the object to be treated W ₂ is transferred from the object to be treated W ₂ → W ₃ → W ₄ → W ₅ by the rotation of the rotary hearth 3 in the rotation direction X, but the guides fixed to the stirring shafts 2 a and 2 b are provided. The blades 7b → 7c → 7d → 7a are sequentially guided to change the direction and position in the zigzag moving direction in the workpiece furnace Z with respect to the rotational direction X while being broken into small blocks. Rotates and is successively brought to the inside of the rotary hearth 3 and reaches the position just outside the ash discharge port 10. During this time, the zigzag transition of the object to be processed increases the residence time, and the crushing action to small lumps increases the voids in the object to be processed and increases the surface area through which the hot air for drying passes. it can. If the auxiliary burner 5 is used, the temperature in the furnace A can be easily adjusted to about 800 to 850 ° C., for example.
When the guide vanes 7a ′, 7b ′, 7c ′, 7d ′ having the lower curved surface shown in FIG. 3 are used, the workpieces W _{2 to} W ₅ move in the turning direction S, and this turning action is achieved. By this, drying and incineration can be performed efficiently.
[0010]
On the other hand, the cooling air sent into the stirring shafts 2a and 2b from the cooling air inlets 12a and 12a is directed downward from the horizontal in the cooling air blowing direction Y opposite to the rotation direction X from the cooling air blowing port 11. Dispersed and discharged into the furnace A, thereby causing a swirl flow in the gas flow in the furnace A, and by blowing the combustion heat of the object to be processed toward the furnace wall, Heat effectively acts on drying, and drying and incineration of the object to be processed are promoted. In the prior art, the combustion air blowing direction from the combustion air outlet was discharged in the vertical downward direction, but in the vertical downward direction, air hits the object to be processed intensively, causing local combustion, and that part becomes high temperature. Although partially solidified in a clinker shape and caught on guide vanes, or complete combustion in the furnace was difficult and the furnace was easily clogged, the waste incinerator 1 can solve this problem. Further, the temperature rise of the stirring shaft 2 and the guide blades 7a, 7b, 7c and 7d can be prevented by the combustion air sent from the combustion air intake ports 12a and 12a.
The dried and incinerated workpieces that have finally reached the immediate outer side of the ash discharge port 10 and overwhelmed the edge projecting around the ash discharge port 10, enter the furnace A from the ash discharge port 10. And is sent to an ash treatment apparatus in a separate process (not shown).
The exhaust gas after combustion is discharged from the exhaust gas discharge port 16 in the exhaust gas discharge direction R, and is sent to an exhaust gas processing apparatus in a separate process (not shown).
[0011]
When the screw feeder 9 is used, the object to be processed is supplied to the supply pipe 13a in the object supply direction P by, for example, a supply pump. For example, the workpiece is dropped into the furnace A in the dropping direction Q while being cut into a small lump like a fist by the blades of the screw 9b rotating at a high speed of 30 to 200 rpm.
The screw feeder 9 is particularly effective for making an object to be processed into a small lump when connected to the inside of the furnace A directly by a supply pump. It is. Further, since the screw 9b is a vertical type, it is effective to prevent the cut objects to be rejoined.
[0012]
【The invention's effect】
According to the waste incinerator of the present invention, the processed object such as dewatered cake of high moisture sludge such as municipal sewage or factory effluent is not partially solidified in a clinker shape during combustion, and it is completely in the furnace. Combustion is possible and drying can be promoted efficiently without causing clogging in the furnace.
Further, by adding a screw feeder, the sticky workpiece can be cut into a small lump without dropping in a continuous state, and more efficient drying and combustion in the furnace is possible.
Further, when the guide blade having the lower end curved surface is used, the object to be processed can be subjected to a strong turning action, and can be further efficiently dried and incinerated.
[Brief description of the drawings]
FIG. 1 is a partial longitudinal sectional view showing an entire example of a waste incinerator according to the present invention.
FIG. 2 is a schematic plan view of a rotary hearth portion of the waste incinerator of FIG. 1 viewed in the B / B direction.
FIG. 3 is a schematic side view showing another example of guide vanes of the waste incinerator of the present invention.
FIG. 4 is a schematic explanatory view of a stirring shaft portion of the waste incinerator of FIGS.
FIG. 5 is a schematic side view of a stirring chain portion of the waste incinerator of FIGS.
6 is a partial longitudinal sectional view showing a screw feeder of the waste incinerator of FIGS. 1 and 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Waste incinerator 2, 2a, 2b Stirring shaft 3 Rotary hearth 4 Incinerator main body 5 Auxiliary burner 6, 15 Drive machine 7a-7e, 7a'-7d 'Guide blade 8 Stir chain 9 Screw feeder 9a 樋 9b Screw 9c Object to be treated inlet 10 Ash outlet 11 Combustion air outlet 12a, 12b Combustion air inlet 13 Object to be treated supply pipe 13a Introduction pipe 13b Throttle pipe 16 Exhaust gas outlet 17 Base 18 Frame A In-furnace O Rotation center P Covered treated feed direction Q treatment object dropping direction R exhaust gas discharge direction S plow direction X rotary hearth rotation direction Y combustion air discharge direction Z to be treated furnace movement direction W ₁ to _W-5 to be treated

Claims (1)

A circular rotary hearth that is rotatable around the center of rotation at the bottom of the incinerator body having an exhaust gas discharge port and an object supply unit at the upper end;
A pair of hollow duct-shaped stirring shafts fixed to the incinerator main body perpendicularly with the rotation center as an intersection above the rotary hearth,
Combustion air outlets that are open to the respective stirring shafts in a direction opposite to the rotation direction of the rotary hearth from the horizontal to the lower side, and are alternately inclined inward and outward with respect to the rotation direction of the rotary hearth. A plurality of plate-shaped guide blades fixed with a slight gap from the floor upper surface;
A combustion air inlet connected to the one stirring shaft end;
An ash discharge port disposed in the center of the rotary hearth,
The object to be processed supplied to the rotary hearth from the workpiece supply unit is combustible while moving to the ash discharge port in a zigzag manner by the rotation of the rotary hearth and the guide blades,
The workpiece supply unit has a cylindrical feeder and a screw feeder having a vertical screw that is rotatably supported in the cage from above,
A horizontal inlet pipe connected to a terminal to be processed supply source, and a workpiece supply pipe having a narrow diameter side of a throttle pipe connected to the inlet pipe and having a narrowed cross section placed laterally on the upper side of the flange, A waste incinerator characterized in that it can be dropped into the furnace while cutting the processed material into small blocks.

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