Incinerator

Abstract

To provide an incineration furnace capable of sufficiently agitating combustion air in the furnace.SOLUTION: The incineration furnace comprises a furnace body for incinerating an incineration object, and a tube rotatable on its long axis for feeding air into the furnace from a plurality of holes. The tube comprises a plurality of agitation blades agitating at least either of an incineration object and an incinerated material resulting from incinerating the incinerating object according to the rotation of the tube.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an incinerator. [Background technology]

[0002] Various incinerators for incinerating sewage sludge (hereinafter also simply referred to as sludge) have been proposed (see Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-181311 A [Patent Document 2] Japanese Patent Application Publication No. 8-261427 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, during sludge incineration, it is desirable to suppress the possibility of localized high temperature areas and an increase in unburned sludge due to the occurrence of non-uniformity in the combustion field. [Means for solving the problem]

[0005] In order to achieve the above-mentioned suppression, the incinerator of the present invention comprises a furnace body for incinerating the material to be incinerated, and a tube that can rotate freely around its longitudinal axis and supplies air into the furnace body through a number of holes, the tube having a number of blades that agitate at least one of the material to be incinerated and the material generated by incinerating the material to be incinerated as the tube rotates. Effect of the Invention

[0006] According to the incinerator of the present invention, the possibility of the occurrence of unevenness in the combustion field, resulting in localized high temperature fields and an increase in unburned sludge, can be suppressed. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a vertical cross-sectional view of an incinerator 100 according to a first embodiment, seen from the front. [Diagram 2] FIG. 2 is a cross-sectional view of the incinerator 100 taken along line AA in the first embodiment. [Diagram 3] FIG. 3 is a cross-sectional perspective view of the air diffuser 14 in the first embodiment. [Figure 4] FIG. 4 is a cross-sectional perspective view of the air diffuser 14 in the second embodiment. [Diagram 5] FIG. 5 is a cross-sectional perspective view of an air diffuser 14 according to the third embodiment. [Figure 6] FIG. 6 is a cross-sectional perspective view of the air diffuser 14 in the fourth embodiment. [Figure 7] FIG. 7 is a front view and a bottom view of an agitating blade 14e according to the fourth embodiment. [Figure 8] FIG. 8 is a cross-sectional perspective view of the air diffuser 14 in the fifth embodiment. [Figure 9] FIG. 9 is a front view and a bottom view of an agitating blade 14f in the fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to these embodiments.

[0009] [First embodiment] First, the first embodiment will be described. Fig. 1 is a vertical cross-sectional view of the incinerator 100 in the first embodiment when viewed from the front. Fig. 2 is a cross-sectional view of the incinerator 100 in the first embodiment along the line AA. Fig. 3 is a cross-sectional perspective view of the air diffuser 14 in the first embodiment.

[0010] As shown in FIG. 1, the incinerator 100 is, for example, a fixed-bed incinerator having a furnace body 10.

[0011] 1 and 2, the furnace body 10 has therein a combustion chamber 11 and an ash discharge chamber 21. The ash discharge chamber 21 is a space located below the combustion chamber 11, for example.

[0012] First, the configuration of the combustion chamber 11 will be described.

[0013] 1, the combustion chamber 11 has a sludge inlet 12, an exhaust gas outlet 13, and an aeration pipe 14. In the combustion chamber 11, sludge 1 (hereinafter also referred to as material to be incinerated 1) introduced through the sludge inlet 12 located at the upper end of the furnace body 10 is piled up.

[0014] The air diffuser 14 has a pipe body 14a through which combustion air supplied from a combustion air supply device (not shown) arranged outside the furnace body 10 passes, and a plurality of stirring blades 14b (hereinafter also referred to as a plurality of blade plates 14b) attached to the outer periphery of the pipe body 14a. The air diffuser 14 combusts the sludge 1 by supplying (spraying) the combustion air to the sludge 1 accumulated in the combustion chamber 11. For example, auxiliary fuel may be supplied from a fuel supply device (not shown) for the purpose of promoting the combustion of the sludge 1.

[0015] The tube body 14a has, for example, one end led out to the outside of the furnace body 10 and is rotatably supported by a support member (not shown). The tube body 14a rotates around its longitudinal axis, for example, by driving a motor 15 connected to the one end led out to the outside of the furnace body 10.

[0016] As shown in Fig. 3, the tube body 14a ejects combustion air from a plurality of air ejection holes 14c (hereinafter, simply referred to as a plurality of holes 14c) provided on the outer periphery. The plurality of air ejection holes 14c are provided, for example, along the longitudinal axis of the tube body 14a.

[0017] Each of the plurality of stirring blades 14b has a shape extending in the radial direction of the pipe body 14a, for example. Specifically, each of the plurality of stirring blades 14b has a shape called a propeller blade, for example, as shown in Fig. 3. Also, each of the plurality of stirring blades 14b is attached, for example, along the outer periphery or the long axis of the pipe body 14a.

[0018] A plurality of air diffuser pipes 14 may be disposed in the combustion chamber 11. In this case, the plurality of air diffuser pipes 14 are disposed in positions where the agitating blades 14b do not come into contact with each other during rotation.

[0019] Specifically, as shown in Fig. 2, for example, an aeration pipe 141 having a pipe body 141a and a plurality of stirring blades 141b, and an aeration pipe 142 having a pipe body 142a and a plurality of stirring blades 142b may be arranged in the combustion chamber 11. For example, one end of each of the pipe body 141a and the pipe body 142a is led out to the outside of the furnace body 10 in the opposite direction and supported rotatably. The pipe body 141a rotates around its long axis, for example, by driving a motor 151 connected to the one end led out to the outside of the furnace body 10. The pipe body 142a rotates around its long axis, for example, by driving a motor 152 connected to the one end led out to the outside of the furnace body 10.

[0020] In this manner, when the air diffuser 14 in this embodiment supplies combustion air to the sludge 1 from the plurality of air ejection holes 14c, the air diffuser 14 supplies the combustion air while rotating around the longitudinal axis of the pipe body 14a.

[0021] This enables the air diffuser 14 in this embodiment to diffuse the combustion air inside the combustion chamber 11 sufficiently.

[0022] Furthermore, in the air diffuser 14 of this embodiment, the multiple agitating blades 14b are attached to the outer periphery of the pipe body 14a, so that the multiple agitating blades 14b also rotate as the pipe body 14a rotates.

[0023] As a result, the air diffuser 14 in this embodiment stirs the sludge 1 in the combustion chamber 11 and supplies combustion air to the space formed during stirring, making it possible to sufficiently diffuse the combustion air. Furthermore, the air diffuser 14 can disrupt the flow of the combustion air ejected from the multiple air ejection holes 14c, making it possible to sufficiently diffuse the combustion air inside the combustion chamber 11. Therefore, the incinerator 100 can make the combustion field uniform, making it possible to suppress the occurrence of local high temperature fields and unburned sludge.

[0024] It is preferable that each of the plurality of air ejection holes 14c ejects the combustion air in the direction in which any one of the plurality of agitating blades 14b is disposed. In other words, it is preferable that each of the plurality of agitating blades 14b is attached in the ejection direction of the combustion air from any one of the plurality of air ejection holes 14c.

[0025] This enables the air diffuser 14 to more turbulently control the flow of the combustion air ejected from the plurality of air ejection holes 14c, and makes it possible to more effectively promote the diffusion of the combustion air inside the combustion chamber 11.

[0026] Next, the configuration of the ash discharge chamber 21 will be described.

[0027] 1, the ash discharge chamber 21 has a screw 22, an ash discharge port 23, and an ash discharge port 24. The ash discharge chamber 21 discharges incineration ash 1a (hereinafter also referred to as incineration material 1a) generated by incinerating the sludge 1 in the combustion chamber 11 to the outside of the furnace body 10. Below, a case where the ash discharge chamber 21 is provided with two ash discharge ports (the ash discharge port 23 and the ash discharge port 24) will be described, but the ash discharge chamber 21 may be provided with only one ash discharge port, or may be provided with three or more ash discharge ports.

[0028] The upper end of the ash discharge chamber 21 is open to the combustion chamber 11, for example, as shown in Fig. 1. That is, the combustion chamber 11 and the ash discharge chamber 21 are internally connected to each other. Inside the combustion chamber 11 and the ash discharge chamber 21, incineration ash 1a is accumulated between the bottom of the ash discharge chamber 21 and the vicinity of the incineration position of the sludge 1 in the combustion chamber 11, and the sludge 1 being incinerated or before incineration is further accumulated on top of it. Therefore, when the incineration ash 1a accumulated in the ash discharge chamber 21 is discharged to the outside from the ash discharge port 23 and the ash discharge port 24, the accumulated incineration ash 1a and sludge 1 move downward as the incineration ash 1a is discharged.

[0029] The screw 22 has a screw shaft 22a, a first screw blade 22b, and a second screw blade 22c, and transports the incineration ash 1a accumulated in the ash discharge chamber 21 to the vicinity of the ash discharge outlet 23 and the ash discharge outlet 24. In other words, the screw 22 transports the incineration ash 1a to a position where it can be discharged outside the furnace body 10.

[0030] The screw shaft 22a has, for example, one end extending outside the furnace body 10 and rotatably supported by a support member (not shown). The screw shaft 22a rotates around its long axis by being driven by a motor 26 connected to the one end extending outside the furnace body 10.

[0031] The first screw blade 22b is attached to the outer periphery of the screw shaft 22a, and extends in a spiral shape toward the end of the screw shaft 22a on the ash discharge port 23 side.

[0032] The second screw blade 22c is attached to the outer periphery of the screw shaft 22a and extends in a spiral shape toward the end of the screw shaft 22a on the side of the ash discharge port 24. That is, the second screw blade 22c has a shape that is symmetrical to the first screw blade 22b with respect to the horizontal center position of the ash discharge chamber 21 as the center.

[0033] In this way, the screw 22 in this embodiment has, for example, a first screw blade 22b, which makes it possible to transport the incineration ash 1a accumulated on the ash discharge outlet 23 side of the horizontal center position of the ash discharge chamber 21 to the vicinity of the ash discharge outlet 23 as the screw shaft 22a rotates, making it possible to discharge the incineration ash 1a from the ash discharge outlet 23 to the outside of the furnace body 10.

[0034] In addition, in this embodiment, the screw 22 has, for example, a second screw blade 22c, which makes it possible to transport the incineration ash 1a accumulated on the ash discharge outlet 24 side of the horizontal center position of the ash discharge chamber 21 to the vicinity of the ash discharge outlet 24 as the screw shaft 22a rotates, making it possible to discharge the incineration ash 1a from the ash discharge outlet 24 to the outside of the furnace body 10.

[0035] Therefore, by having the first screw blade 22b and the second screw blade 22c, the screw 22 can evenly discharge the incineration ash 1a accumulated at each position at the bottom of the ash discharge chamber 21.

[0036] This enables the screw 22 to horizontally deposit the sludge 1 in the combustion chamber 11, making it possible to increase the combustion efficiency of the sludge 1 in the combustion chamber 11.

[0037] The exhaust gas generated by the combustion of the sludge 1 may be discharged through the exhaust gas outlet 13 to an exhaust gas treatment facility (not shown).

[0038] Specifically, the exhaust gas generated by the incineration of the sludge 1 (hereinafter, simply referred to as exhaust gas) is passed through, for example, a white smoke prevention air preheater that generates heated air (white smoke prevention air) that prevents water vapor in the exhaust gas from appearing as white smoke, and a white smoke prevention air preheater that brings the exhaust gas into contact with water to reduce the amount of SO in the exhaust gas. X The exhaust gas is then transferred to a smoke washing tower, which removes components such as HCl.

[0039] [Second embodiment] Next, a second embodiment will be described. Fig. 4 is a cross-sectional perspective view of an air diffuser 14 in the second embodiment.

[0040] As shown in FIG. 4, the air diffuser 14 in the second embodiment has a plurality of stirring blades 14d called paddle blades, instead of the plurality of stirring blades 14b called propeller blades described in FIG.

[0041] As a result, the air diffuser 14 in the second embodiment can disrupt the flow of the combustion air ejected from the multiple air ejection holes 14c into a flow different from that described in Fig. 3, and can diffuse the combustion air inside the combustion chamber 11. Therefore, the air diffuser 14 in the second embodiment can make the combustion field uniform by a method different from that described in Fig. 3, and can suppress the generation of local high temperature fields and unburned sludge.

[0042] [Third embodiment] Next, a third embodiment will be described. Fig. 5 is a cross-sectional perspective view of an air diffuser 14 in the third embodiment.

[0043] As shown in FIG. 5, the air diffuser 14 in the third embodiment has a plurality of stirring blades 14e called ribbon blades, instead of the plurality of stirring blades 14b called propeller blades described in FIG.

[0044] As a result, the aeration pipe 14 in the third embodiment is able to make the combustion field uniform by a method different from that described in FIG. 3, and it is possible to suppress the occurrence of localized high temperature fields and unburned sludge.

[0045] In the example shown in FIG. 4, the pipe body 14a has one or more fixing parts (not shown) that fix the positions of the multiple agitating blades 14e relative to the pipe body 14a.

[0046] [Fourth embodiment] Next, a fourth embodiment will be described. Fig. 6 is a cross-sectional perspective view of the aeration pipe 14 in the fourth embodiment. Fig. 7 is a front view and a bottom view of the agitation blade 14e in the fourth embodiment. Specifically, Fig. 7(A) is a front view of the agitation blade 14e in the fourth embodiment, and Fig. 7(B) is a bottom view of the agitation blade 14e in the fourth embodiment.

[0047] As shown in Figs. 6 and 7, the air diffuser 14 in the fourth embodiment has a plurality of agitating blades 14e instead of the plurality of agitating blades 14b called propeller blades described in Fig. 3 .

[0048] Each of the plurality of stirring blades 14e has a base end surface 14e1 attached to the outer periphery of the pipe body 14a and extending in the radial direction of the pipe body 14a, an intermediate surface 14e2 extending from the tip of the base end surface, and a curved surface 14e3 (hereinafter also referred to as the first curved surface 14e3) extending from the tip of the intermediate surface 14e2. Each of the plurality of stirring blades 14e is curved from the base end surface 14e1 to the intermediate surface 14e2 in the circumferential direction of the pipe body 14a, and is curved from the intermediate surface 14e2 to the curved surface 14e3 in the longitudinal direction of the pipe body 14a. Note that the line L1 in FIG. 7(A) indicates the boundary between the intermediate surface 14e2 and the curved surface 14e3.

[0049] That is, the aeration pipe 14 in the fourth embodiment has the curved surface 14e3, which makes it possible to agitate the sludge 1 while trapping it.

[0050] As a result, the aeration pipe 14 in the fourth embodiment is able to make the combustion field uniform by a method different from that described in FIG. 3, and it is possible to suppress the occurrence of localized high temperature fields and unburned sludge.

[0051] [Fifth embodiment] Next, a fifth embodiment will be described. Fig. 8 is a cross-sectional perspective view of the air diffuser 14 in the fifth embodiment. Fig. 9 is a front view and a bottom view of the agitating blade 14f in the fifth embodiment. Specifically, Fig. 9(A) is a front view of the agitating blade 14f in the fifth embodiment, and Fig. 9(B) is a bottom view of the agitating blade 14f in the fifth embodiment.

[0052] As shown in Figs. 8 and 9, the air diffuser 14 in the fifth embodiment has a plurality of agitating blades 14f instead of the plurality of agitating blades 14b called propeller blades described in Fig. 3 .

[0053] Each of the plurality of stirring blades 14f has a base end surface 14f1 attached to the outer periphery of the pipe body 14a and extending in the radial direction of the pipe body 14a, an intermediate surface 14f2 extending from the tip of the base end surface, a curved surface 14f3 (hereinafter also referred to as the first curved surface 14f3) extending from the tip of the intermediate surface 14f2, and a curved surface 14f4 (hereinafter also referred to as the second curved surface 14f4) extending from the tip of the curved surface 14f3. Each of the plurality of stirring blades 14f is curved from the base end surface 14f1 to the intermediate surface 14f2 in the circumferential direction of the pipe body 14a, curved from the intermediate surface 14f2 to the curved surface 14f3 in the long axis direction of the pipe body 14a (hereinafter also referred to as the first long axis direction), and curved from the curved surface 14f3 to the curved surface 14f4 in the radial direction of the pipe body 14a (or the opposite direction to the first long axis direction). In addition, the line L2 in FIG. 9(A) indicates the boundary line between the intermediate surface 14f2 and the curved surface 14f3, and the line L3 indicates the boundary line between the curved surface 14f3 and the curved surface 14f4.

[0054] That is, each of the multiple agitating blades 14f has a curved surface 14f4 that is further curved in the opposite direction to the curved surface 14f3 in addition to the configuration of the agitating blade 14e described in Fig. 6 etc. In other words, in the curved surface 14f4 that is further curved in the opposite direction to the curved surface 14f3, the vertical cross-sectional structure of the curved surface 14f3 and the curved surface 14f4 is a substantially S-shaped structure.

[0055] As a result, the air diffuser 14 in the fifth embodiment can improve the removal of the sludge 1 captured by the curved surface 14f3 during agitation of the sludge 1, and can further promote the agitation of the sludge 1. Therefore, the air diffuser 14 in the fifth embodiment can make the combustion field uniform by a method different from that described in Fig. 3, and can suppress the occurrence of local high temperature fields and unburned sludge.

[0056] 3 to 9 are merely examples, and impellers having other shapes may be attached to the pipe body 14a. Specifically, the pipe body 14a may be equipped with a plurality of impellers that constitute turbine blades or anchor blades, for example. [Explanation of symbols]

[0057] 1: Sludge 1a: Incineration ash 10: Furnace body 101: Combustion chamber 12: Sludge inlet 13: Exhaust gas outlet 14: Aeration pipe 14a: Pipe body 14b: Stirring blade 14c: Air outlet hole 14d: Agitator blade 14e: Agitator blade 14e1: Proximal surface 14e2: Intermediate surface 14e3: Curved surface 14f: Mixing blade 14f1: Proximal surface 14f2: Intermediate surface 14f3: Curved surface 14f4: Curved surface 15: Motor 21: Ash discharge chamber 22: Screw 22a: Screw shaft 22b: First screw blade 23c: Second screw blade 24: Ash outlet 25: Ash outlet 26: Motor 100: Incinerator 141: Diffuser pipe 141a: Pipe body 141b: mixing blade 142: aeration pipe 142a: Tube body 142b: Stirring blade 151: Motor 152: Motor

Claims

1. A furnace body that incinerates the material to be incinerated that is input from above and discharges the incinerated material from below; A tube that can rotate about a long axis and supplies air into the furnace body through a plurality of holes; A screw that transports the incineration material generated by incinerating the material to be incinerated in the furnace body to a position where it can be discharged outside the furnace body, The tube is provided with a plurality of blades that agitate the material to be incinerated and the material to be incinerated as the tube rotates, Each of the plurality of holes ejects the air in a direction in which at least one of the plurality of blades is disposed, thereby supplying the air to a space formed between the material to be incinerated and the material to be incinerated by stirring by at least one of the plurality of blades; Each of the plurality of slats comprises: A shape that provides a driving force in a longitudinal direction of the tube, An incinerator that diffuses the air supplied to the material to be incinerated and the material to be incinerated.

2. 2. The incinerator of claim 1, wherein each of said plurality of slats is attached to an outer periphery of said tube and extends radially thereabout.

3. 2. The incinerator of claim 1, wherein each of said plurality of vanes is one or more propeller vanes, one or more paddle vanes, or one or more ribbon vanes.

4. The incinerator according to claim 1 , wherein each of the plurality of holes ejects the air in a direction in which any one of the plurality of vanes is disposed.

5. The incinerator of claim 1, wherein each of the plurality of vanes has a base end surface attached to the outer periphery of the pipe and extending in the radial direction of the pipe, an intermediate surface extending from the tip of the base end surface, and a first curved surface extending from the tip of the intermediate surface, and curves in the circumferential direction of the pipe from the base end surface to the intermediate surface, and curves in the longitudinal direction of the pipe from the intermediate surface to the first curved surface.

6. The incinerator according to claim 5, wherein each of the plurality of blades further has a second curved surface extending from a tip of the first curved surface and curves in a radial direction of the tube from the first curved surface to the second curved surface.

7. The incinerator according to claim 1, wherein the furnace body discharges the incinerated materials from below a position where the materials were charged.

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