JP3853128B2 - Rotary kiln waste input device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waste charging device for a rotary kiln that incinerates or incinerates and melts waste.
[0002]
[Prior art]
A waste chute is attached to the combustion hood fixedly installed at the inlet of the rotating furnace body. This charging chute is formed in a cooling structure in which water pipes are incorporated in the bottom surface and the left and right side surfaces, respectively, in order to receive radiant heat in the furnace body, and this combustion hood is constructed in a fireproof structure with a refractory material.
[0003]
[Problems to be solved by the invention]
However, the above-mentioned conventional throwing chute has a problem that the chute is likely to be thermally deformed particularly when it receives a lot of radiant heat from the furnace body. Also, in the lower surface hood below the charging chute, the melt is likely to solidify and clinker is generated, which may hinder the supply of waste, and it was necessary to stop the operation of the furnace and remove the deposits. .
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary kiln waste charging apparatus capable of solving the above-described problems and preventing thermal deformation and preventing clinker from adhering to a combustion hood below the charging chute.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a waste charging device for a rotary kiln in which a cylindrical furnace body is rotatably arranged around a rotation axis in a tilt direction which is a horizontal direction or an outlet side lower side. A waste water charging chute is mounted on a chute mounting portion of a combustion hood fixedly disposed at the furnace body inlet, and a water pipe wall having a cooling water pipe at the bottom, left and right sides, and the ceiling of the charging chute The upper surface hood portion facing the furnace body inlet on the chute mounting portion of the combustion hood is protruded by a predetermined amount from the lower surface hood portion facing the furnace body inlet below the chute mounting portion to the inside of the furnace body, and in the upper surface hood portion. The water pipe of the ceiling water pipe wall is extended and built in.
[0006]
According to the above configuration, the bottom part, the left and right side parts of the charging chute and the ceiling part are constituted by the water pipe wall, and the upper surface hood part is cooled by extending the water pipe from the ceiling water pipe wall, so that the radiant heat from the furnace body Can be absorbed effectively and thermal deformation can be prevented. In addition, in the lower surface hood part, the melt adhering to the upper surface hood drips downward, which adheres to the lower surface hood part and solidifies to cause the clinker to grow, but the upper surface hood part protrudes from the lower surface hood part. Therefore, the melt dripping from the upper surface hood portion does not fall into the furnace and adhere to the lower hood. Therefore, it is possible to prevent the clinker from growing on the lower surface hood portion.
[0007]
According to a second aspect of the present invention, in the above configuration, the water pipe of the bottom water pipe wall is extended and incorporated in the lower surface hood part of the combustion hood.
According to the above configuration, since the water pipe extending from the bottom water pipe wall is built in the lower surface hood part, piping can be performed easily and at a lower cost than the case where the water pipe is separately built. Further, by cooling the lower surface hood portion, the adhesion of the melt can be reduced, and the growth of the clinker can be prevented.
[0008]
Furthermore, the invention according to claim 3 circulates the cooling water of the water pipe wall to the left and right side water pipe walls and the ceiling water pipe wall in the order as it decreases from the bottom water pipe wall receiving much radiant heat. It is comprised as follows.
[0009]
According to the above configuration, the charging chute can be effectively cooled with a small amount of cooling water by flowing cooling water in order from the bottom heated to a higher temperature.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Here, an embodiment of a rotary melt kiln according to the present invention will be described with reference to FIGS.
[0011]
In this molten kiln, as shown in FIG. 4, a cylindrical furnace body 11 is disposed on a gantry 2 installed on a floor surface 1, and the furnace body 11 is heated at a small inclination angle θ via a rotation support device 3. It is supported so as to be rotatable about a rotation axis O (horizontal direction is also possible) inclined downward on the body outlet 11b side. The furnace body 11 is rotationally driven at a constant speed by a rotational drive device 4 via a known rotational mechanism 5 having a ring gear and a pinion. Further, the waste supplied from the waste charging chute 7 provided in the combustion hood 6 on the furnace body inlet 11a side is heated and burned in the combustion zone C on the inlet side. The incineration residue (incineration ash) is sent to the melting zone M and heated and melted, and the generated molten slag is discharged from the furnace body outlet 11b to the slag cooling device 8 to generate granulated slag. Further, the combustion exhaust gas discharged from the outlet 11b of the furnace body 11 is introduced into the secondary combustion chamber 9, and the unburned matter is subjected to secondary combustion by the secondary air. The exhaust gas discharged from the secondary combustion chamber 9 is heat-recovered, and then the harmful substances are removed by the detoxification processing device and discharged into the atmosphere.
[0012]
As shown in FIG. 1, a chute mounting portion 6a is formed through the combustion hood 6 installed on the gantry 2 at the furnace body inlet 11a, and a charging chute 7 is mounted on the chute mounting portion 6a.
[0013]
The charging chute 7 includes an inlet-side vertical portion 7a and an outlet-side inclined portion 7b attached to the chute mounting portion 6a. The inclined portion 7b that receives radiant heat has the water tube groups 25 to 28 fixed to the outer surface of the steel plate. Formed in a rectangular tube shape comprising a bottom water pipe wall (bottom water pipe wall) 21, left and right side water pipe walls (left and right side water pipe walls) 22, 23, and a ceiling water pipe wall (ceiling water pipe wall) 24, respectively. Has been.
[0014]
Further, the upper surface hood portion 6b facing the furnace body inlet 11a on the chute mounting portion 6a of the combustion hood 6 is from the outlet opening surface 7c of the charging chute 7 and the lower surface hood portion 6c facing the furnace body inlet 11a below the chute mounting portion 6a. It is configured such that a melt projecting from the upper surface hood portion 6b does not adhere to the lower surface hood portion 6c.
[0015]
As shown in FIG. 3, the cooling unit for supplying cooling water to the water pipe walls 21 to 24 has a bottom water pipe wall whose temperature is increased by receiving the most radiant heat from the cooling water supplied from the cooling water pump. From 21, the left side water pipe wall 22, the right side water pipe wall 23, and the ceiling water pipe wall 24 are sequentially sent in order of decreasing temperature. The cooling water used is pressurized and circulated so as not to evaporate at 100 ° C., and corrosion is prevented by heating the water pipe wall above the dew point.
[0016]
That is, the water pipe group 25 of the bottom water pipe wall 21 to which the cooling water is supplied first is arranged at the inlet header pipe 25a arranged outside the lower surface hood part 6c and the front side part of the inclined part 7b of the charging chute 7. And a plurality of cooling water pipes 25b connected to the inlet header pipe 25a through the combustion hood 6 to the lower surface hood portion 6c, and further, a rising portion 25d along the lower surface hood portion 6c. Is extended obliquely upward along the bottom wall and connected to the outlet header pipe 25c.
[0017]
Further, the water pipe group 26 of the left side water pipe wall 22 to which the cooling water is supplied from the outlet header pipe 25c of the bottom water pipe wall 21 has an inlet header pipe 26a disposed along the vertical left side portion of the outlet opening face 7c. An outlet header pipe 26c arranged along the horizontal left side of the inlet of the inclined portion 7b, and a plurality of cooling water pipes 26b connected to the inlet header pipe 26a are arranged in parallel along the left side surface of the inclined portion 7b. And connected to the outlet header pipe 26c.
[0018]
Further, the water pipe group 27 of the right side water pipe wall 23 to which the cooling water is supplied from the outlet header pipe 26c of the left side water pipe wall 22 is an inlet header pipe 27a arranged along the vertical right side portion of the outlet opening face 7c. And an outlet header pipe 27c arranged along the horizontal right side of the inclined portion 7b inlet, and a plurality of cooling water pipes 27b connected to the inlet header pipe 27a are arranged in parallel along the right side surface of the inclined portion 7b. It is arranged and connected to the outlet header pipe 27c.
[0019]
Furthermore, the water pipe group 28 of the ceiling surface water pipe wall 24 to which the cooling water is supplied from the outlet header pipe 27c of the right side water pipe wall 23 is an inlet header pipe 28a arranged along the upper side of the outlet opening face 7c. And a plurality of cooling water pipes 28b connected to the inlet header pipe 28a in parallel along the ceiling surface of the inclined section 7b. It is arranged and connected to the outlet header pipe 28c, and the cooling water is drained from the outlet header pipe 28c.
[0020]
According to the above embodiment, the outlet side inclined portion 7b of the charging chute 7 is constituted by the bottom surface water tube wall 21, the left and right side surface water tube walls 22, 23, and the ceiling surface water tube wall 24, and the top surface hood portion 6b has a ceiling. Since the inlet header pipe 28a and the cooling water pipe 28b of the partial water pipe wall 24 are disposed and cooled, the radiant heat from the inside of the furnace body 1 can be effectively absorbed and the thermal deformation of the charging chute 7 is prevented. be able to.
[0021]
Further, in the lower surface hood portion 6c, the melt adhering to the upper surface hood portion 6b drips downward, which adheres to the lower surface hood portion 6c and solidifies to cause the clinker to grow. However, in the above embodiment, since the upper surface hood portion 6b protrudes into the furnace body 11 from the lower surface hood portion 6c, the melt dripping from the upper surface hood portion 6b falls into the furnace body 11 to cause the lower surface hood portion. It does not adhere to 6c. Therefore, it is possible to prevent the occurrence of clinker that tends to occur in the lower surface hood portion 6c.
[0022]
Furthermore, since the rising portion 25d of the cooling water pipe 25b of the bottom surface water pipe wall 21 is provided in the lower surface hood part 6c of the combustion hood 6, piping can be carried out easily and at a lower cost compared to separately incorporating a water pipe, Further, by cooling the lower surface hood portion 6c, the adhesion of the melt can be reduced, and the growth of the clinker can be prevented.
[0023]
Furthermore, the cooling unit of the charging chute 7 is configured to circulate the cooling water in the order of the bottom water pipe wall 21, the left and right side water pipe walls 22 and 23, and the ceiling surface water pipe wall 24. It can be made to flow in the order heated to high temperature, and compared with sending cooling water to each surface water pipe wall 21-24 respectively, it can cool effectively with a cooling water amount of about 1/4.
[0024]
In the above embodiment, the molten kiln that continuously incinerates and melts the waste is used. However, a rotary kiln that performs only incineration may be used.
Moreover, although the waste input chute 7 is formed in a cylindrical shape with a square cross section, it may be a circular shape or a cylindrical shape with a polygonal cross section.
[0025]
【The invention's effect】
As described above, according to the first aspect of the present invention, the bottom portion, the left and right side portions and the ceiling portion of the charging chute are constituted by the water pipe wall, and the upper surface hood portion is extended from the ceiling water pipe wall. Since it cools, the radiant heat from a furnace body can be absorbed effectively and a thermal deformation can be prevented. In addition, in the lower surface hood part, the melt adhering to the upper surface hood drips downward, which adheres to the lower surface hood part and solidifies to cause the clinker to grow, but the upper surface hood part protrudes from the lower surface hood part. Therefore, the melt dripping from the upper surface hood portion does not fall into the furnace and adhere to the lower hood. Therefore, it is possible to prevent the clinker from growing on the lower surface hood portion.
[0026]
According to the invention described in claim 2, since the water pipe extending from the bottom water pipe wall is built in the lower surface hood part, the piping is easier and less expensive than the separate water pipe built-in. Can do. Further, by cooling the lower surface hood portion, the adhesion of the melt can be reduced, and the growth of the clinker can be prevented.
[0027]
Furthermore, according to the invention described in claim 3, the charging chute can be effectively cooled with a small amount of cooling water by flowing the cooling water in order from the bottom heated to a higher temperature.
[Brief description of the drawings]
FIG. 1 is a side sectional view illustrating a waste charging chute according to an embodiment of a rotary melt kiln according to the present invention.
FIG. 2 is a schematic front view for explaining the throwing chute.
FIG. 3 is an explanatory view showing a cooling unit of the charging chute.
FIG. 4 is a side view showing the overall configuration of the rotary melt kiln.
[Explanation of symbols]
6 Combustion hood 6b Upper surface hood portion 6c Lower surface hood portion 7 Waste charging chute 7b Inclined portion 11 Furnace 11a Furnace inlet 21 Bottom water tube wall 22 Left side water tube wall 23 Right side surface water tube wall 24 Ceiling surface water tube wall 25 ~ 28 Water tube group

Claims (3)

A rotary kiln waste throwing device in which a cylindrical furnace body is rotatably arranged around a rotation axis center in an inclined direction which is a horizontal direction or an outlet side lower side,
Attach the waste input chute to the chute mounting part of the combustion hood fixedly arranged at the furnace body inlet,
The bottom and left and right sides of the charging chute and the ceiling are constituted by a water pipe wall having a cooling water pipe,
The upper surface hood portion facing the furnace body inlet on the chute mounting portion of the combustion hood protrudes a predetermined amount from the lower surface hood portion facing the furnace body inlet below the chute mounting portion to the inside of the furnace body,
A rotary kiln waste charging apparatus, wherein a water pipe of the ceiling water pipe wall is extended and built in the upper surface hood part. The rotary kiln waste charging apparatus according to claim 1, wherein a water pipe of a bottom water pipe wall is extended and incorporated in a lower face hood portion of the combustion hood. The cooling water of the water pipe wall is configured to circulate to the left and right side water pipe walls and the ceiling water pipe wall in order of decreasing from the bottom water pipe wall receiving a large amount of radiant heat. 2. A rotary kiln waste charging apparatus according to 2.

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