TW201923285A - Mechanical stoker type incinerator for combusting material to be incinerated - Google Patents

Abstract

Provided is a mechanical stoker type incinerator for combusting an incineration object and includes a drying stage (11), a combustion stage (12) and a post-combustion stage (13), each of the stages having a plurality of fixed fire grates (15) and a plurality of movable fire grates (16), and in which the incineration object supplied from a feeder (4) is subjected to drying, combustion and post-combustion while sequentially conveying the incineration object through the drying stage (11), the combustion stage (12) and the post-combustion stage (13), wherein the drying stage (11) is disposed to be inclined so that a downstream side in a conveying direction is directed downward, the combustion stage (12) is connected to the drying stage (11) and disposed to be inclined so that the downstream side in the conveying direction is directed upward, and the post-combustion stage (13) is connected to the combustion stage (12) and disposed to be inclined so that the downstream side in the conveying direction is directed upward.

Description

Mechanical hearth type incinerator for incineration

The present invention relates to a mechanical hearth incinerator for burning incinerators such as garbage. This application claims priority based on Japanese Patent Application No. 2017-201342 filed in Japan on October 17, 2017, and the contents are incorporated herein by reference.

As an incinerator for incineration such as garbage, there is known a mechanical hearth type incinerator capable of efficiently performing incineration treatment without sorting a large amount of incinerator. As a mechanical hearth type incinerator, the following mechanical hearth type incinerator is known: the mechanical hearth type incinerator has a stepped structure and is provided with a drying section, a combustion section, and a post-combustion section in order to exert drying, combustion, Post-combustion functions.

In order to burn the incinerator reliably, the inclination angle of the hearth was studied. As for the inclination angle of the hearth, for example, as described in Patent Document 1, there is an inclination angle in which the downstream side of the mounting surface in the conveying direction of all the stages of the drying stage, the combustion stage, and the post-combustion stage is inclined downward. . In the following description, for example, the case where the downstream side of the mounting direction of the mounting surface of the drying section faces downward is simply referred to as the drying section facing downward (the same is true for the combustion section and the post-combustion section).
In addition, as described in Patent Document 2, the drying section may be inclined downward and the combustion section and the post-combustion section may be arranged horizontally. As described in Patent Document 3, the drying section and the combustion section may be inclined downward and the post-combustion section may be disposed horizontally. In the case where the downstream side of the mounting surface in the conveying direction is inclined upward, there may be a case where all the parts are inclined upward as described in Patent Document 4. It should be noted that, for example, the case where the downstream side of the mounting surface of the combustion stage in the conveying direction is directed upward is only referred to as the combustion stage is directed upward (the same is true for the drying stage and the post-combustion stage).
[Prior technical literature]
[Patent Literature]

Patent Document 1: Japanese Patent Application Laid-Open No. 6-265125 Patent Document 2: Japanese Patent Application Laid-Open No. 6-84140 Patent Literature 3: Japanese Patent Publication No. 57-12053 Japanese Patent Publication No. 50-65062

[Problems to be Solved by the Invention]

However, in the above-mentioned mechanical hearth type incinerator, incinerators of various properties (materials, shapes, and moisture contents) are injected. However, incinerators having a high sliding rate or a shape such as a spherical ball, have high moisture contents. In the case of incineration (a large amount of water), it is difficult to perform incineration similar to other incineration in any mechanical hearth type incinerator.

That is, in the mechanical hearth type incinerators described in Patent Literature 1, Patent Literature 2, and Patent Literature 3, since the drying section is inclined downward, and the combustion section is inclined downward or arranged horizontally, a material that is easy to slide or The easily rolled incinerator is transported to the post-combustion section earlier than other incinerators. Therefore, there is a problem that the incinerated compound is not fully incinerated and is in an unburned state. Be discharged.

In addition, in the mechanical hearth type incinerator described in Patent Document 4, since all the sections of the drying section, the combustion section, and the post-combustion section are inclined upward, the material which is easy to slide or the shape to be rolled is incinerated The incinerated compounds with high moisture content accumulate at the bottom of the stage (fall wall) arranged between the feeder and the drying section and are difficult to be transported to the combustion section. Therefore, there are problems as follows: sometimes it is necessary to limit the amount of input or Temporarily stop investing.

An object of the present invention is to provide a mechanical hearth incinerator for burning incinerators, such as garbage, which can be continuously put into the incinerator regardless of the properties of the incinerator and can completely burn the incinerator.

[Means to solve the problem]

According to the first aspect of the present invention, a mechanical hearth type incinerator for burning incinerators such as garbage is supplied with incinerators from a feeder, and is burned in a drying section including a plurality of fixed grate and a plurality of mobile grate. The section and the post-combustion section carry out the drying, combustion and the post-combustion mechanical hearth type incinerator while sequentially conveying the incinerated material, wherein the drying section is directed downward with the downstream side in the conveying direction. The combustion section is inclinedly arranged, the combustion section is connected to the drying section, and is inclinedly arranged so that the downstream side of the conveying direction becomes upward, and the post-combustion section is connected to the combustion section and is connected with the The downstream side in the conveyance direction is arranged obliquely so as to face upward.

According to such a structure, the inclination of the drying section is directed downward, so that the incinerated matter of any shape can be transported to the combustion section without stagnation, and the inclination of the combustion section and the post-combustion section is directed upward, Thus, after the combustion section, the incinerated can be fully burned and transported without slipping or rolling off easily.
That is, in the case of an incinerated material having a shape that is easy to slide or a shape that is easy to roll, it may be conveyed to the combustion section early due to rolling or the like in the drying section, so there is a possibility that the drying section is not sufficiently dried. . However, because the combustion section and the post-combustion section are inclined upward, the incinerated material that rolls behind in the drying section will not be transported early in the combustion section and the post-combustion section, etc., and will necessarily be fully dried in the combustion section incineration. Since the incinerated material having a high moisture content does not stay in the drying section and is transported to the combustion section while being dried, it is inevitable that the combustion section is sufficiently incinerated in the same manner.
Therefore, regardless of the properties of the incinerated, the incinerated can be continuously input, and the incinerated can be completely burned.

In the above-mentioned mechanical hearth type incinerator, the end portion on the downstream side in the conveying direction of the post-combustion section may be disposed in the vertical direction with respect to the conveying direction of the combustion section. The downstream end portion is substantially the same position or is disposed at a position higher than the end portion of the combustion section.

According to such a structure, even if the incinerated material rolls off in the drying stage, etc., it is possible to prevent the incinerated substance from being discharged from the post-combustion stage without being sufficiently burned.

In the above-mentioned mechanical hearth type incinerator, the fixed grate and the mobile grate may be located on the downstream side of the conveying direction with respect to the drying section, the combustion section, and the post-combustion. The mounting surface of the segment is arranged obliquely so as to face upward.

According to such a structure, a mobile grate can be operated so that an incinerator may be conveyed to a downstream side in a conveyance direction, stirring the incinerator on a fixed grate.

In the above-mentioned mechanical hearth type incinerator, the drying section, the combustion section, and the post-combustion section may each have a driving mechanism for individually driving a plurality of the moving grate provided therein. Setting the driving speed in the drying section, the combustion section, and the after-combustion section to the same speed as each other, or the speed of the driving section in the drying section, the combustion section, and the after-combustion section. At least a part is set to a different speed.

According to such a structure, the conveyance speed of each stage can be changed according to the property of the incinerated material to be injected.

In the mechanical hearth type incinerator, the combustion section and the post-combustion section may be continuously connected without a stage.

According to such a structure, incineration can be further incinerated continuously.

In the above-mentioned mechanical hearth type incinerator, at least a part of the plurality of moving grate in the drying section may be a protruding grate provided with a protrusion at a front end.

According to such a structure, the stirring effect of the incineration of a moving grate during reciprocation can be improved.

In the above-mentioned mechanical hearth type incinerator, at least a part of the plurality of moving grate in the combustion section may be a protruding grate provided with a protrusion at a front end.

In the above mechanical hearth type incinerator, the inclination angle of the hearth of the drying section may be configured as an angle between -15 ° and -25 °, and the furnaces of the combustion section and the post-combustion section The bed tilt angle is configured as an angle between + 5 ° and + 15 °.
In addition, the inclination angle of the hearth of the drying section may be arranged at -20 °, and the inclination angle of the hearth of the combustion section and the after-combustion section may be arranged at + 10 °.
According to this structure, since the required hearth length can be shortened, it is possible to provide a mechanical hearth-type incinerator which can be reduced in size and inexpensive.

[Inventive effect]

According to the present invention, regardless of the properties of the incinerated, the incinerated can be continuously input, and the incinerated can be completely burned.

[First Embodiment]
Hereinafter, a mechanical hearth incinerator according to a first embodiment of the present invention will be described in detail with reference to the drawings.
The mechanical hearth type incinerator of the present embodiment is a mechanical hearth type incinerator for burning incinerators such as garbage. As shown in FIG. 1, it includes a hopper 2 for temporarily storing incinerated T, and incineration for burning incinerated T. Furnace 3, feeder 4 for supplying incinerated T to incinerator 3, mechanical hearth 5 (including grate 15, 16 of drying section 11, combustion section 12, and post-combustion section 13) provided on the bottom side of incinerator 3 ), And an air chamber 6 provided below the mechanical hearth 5.

The feeder 4 pushes the incinerated T continuously supplied to the feeder platform 7 through the hopper 2 into the incinerator 3. The feeder 4 uses the feeder driving device 8 to reciprocate on the feeder platform 7 with a predetermined stroke.
The air chamber 6 supplies primary air from a blower (not shown) to each part of the mechanical hearth 5.
The incinerator 3 is provided above the mechanical hearth 5 and has a combustion chamber 9 composed of a primary combustion chamber and a secondary combustion chamber. A blower 10 that supplies secondary air to the combustion chamber 9 is connected to the incinerator 3.

The mechanical hearth 5 is a combustion device in which the grate 15 and 16 are arranged in steps. The incinerated T burns on the mechanical hearth 5.
Hereinafter, the direction in which the incinerator T is transported is referred to as a transport direction D. The incinerated material T is conveyed on the mechanical hearth 5 in the conveying direction D. In FIGS. 1, 2 and 3, the right side is the downstream side D1 in the conveying direction. In addition, the surfaces on which the grate 15 and 16 are mounted are referred to as mounting surfaces, and a horizontal surface and a mounting surface are formed around the ends (11b, 12b, 13b) on the upstream side of the drying section, the combustion section, or the post-combustion section. The angle on the conveying direction D side is called the hearth tilt angle (mounting angle). When the downstream side of the mounting surface in the conveying direction faces upward from the horizontal plane, set the hearth tilt angle to a positive value, and when the downstream side of the mounting surface in the conveying direction faces downward compared to the horizontal plane, set the furnace The bed tilt angle is set to a negative value, which will be described here.

The mechanical hearth 5 includes a drying section 11 for drying the incinerated T, an incineration section 12 for incineration of the incinerated T, and an incineration component (post-combustion) in order from the upstream side in the conveyance direction of the incinerated T.的 后 燃 段 13。 After the combustion section 13. In the mechanical hearth 5, in the drying section 11, the combustion section 12, and the post-combustion section 13, while the incinerated compound T is sequentially conveyed, drying, combustion, and post-combustion are performed respectively.
Each section 11, 12, 13 has a plurality of fixed grate 15 and a plurality of mobile grate 16.
The fixed grate 15 and the moving grate 16 are alternately arranged in the conveying direction D. The moving grate 16 is reciprocated along the conveyance direction D of the incinerated material T. The reciprocating motion of the moving grate 16 is used to convey the incinerated T on the mechanical hearth 5 and perform stirring. That is, the lower layer portion of the incinerated T is moved to replace the upper layer portion.

The drying section 11 receives the incinerated T pushed out by the feeder 4 and dropped into the incinerator 3, evaporates the moisture of the incinerated T, and decomposes a part of the heat. The combustion section 12 ignites the incinerated compound T dried by the drying section 11 by the primary air supplied from the lower air chamber 6 and burns volatile components and fixed carbon components. The post-combustion section 13 combusts unburned components such as fixed carbon components and the like that have passed through the combustion section 12 when they are not sufficiently burned until they are completely ashed.
An ash and slag outlet 17 is provided at the exit of the post-combustion section 13. Ash and ash are discharged from the incinerator 3 through the ash and slag outlet 17.

The drying section 11, the combustion section 12 and the post-combustion section 13 each have a driving mechanism 18 that drives a moving grate 16. That is, the drying section 11, the combustion section 12, and the post-combustion section 13 each have a driving mechanism 18 that drives a plurality of moving grates 16.

The driving mechanism 18 is mounted on a beam 19 provided on the mechanical hearth 5. The drive mechanism 18 includes a hydraulic cylinder 20 mounted on the beam 19, an arm 21 that operates by the hydraulic cylinder 20, and a cross beam 22 connected to the tip of the arm 21. The beam 22 and the moving grate 16 are connected via a bracket 23.

According to the drive mechanism 18 of this embodiment, the arm 21 is operated by the expansion and contraction of the rod of the hydraulic cylinder 20. The beam 22 is configured to move along the mounting surfaces 11 a, 12 a, and 13 a of the mechanical hearth 5 in response to the movement of the arm 21, and the beam 22 is moved to drive the moving grate 16 connected to the beam 22.

The drive mechanism 18 of the present embodiment uses the hydraulic cylinder 20, but is not limited to this. For example, a hydraulic motor, an electric cylinder, an electric linear motor, or the like can be used. In addition, the form of the drive mechanism 18 is not limited to the above, as long as the moving grate 16 can be reciprocated, it may be any form of drive mechanism. For example, the cross beam 22 and the hydraulic cylinder 20 may be directly connected and driven without disposing the arm 21.

In the mechanical hearth type incinerator 1 according to the present embodiment, the driving speed of the moving grate 16 in the drying section 11, the combustion section 12, and the post-combustion section 13 can be set to the same speed as each other or in the drying section. 11. At least a part of the combustion section 12 and the post-combustion section 13 are set to different speeds.
For example, when the incinerated T required to perform sufficient combustion in the combustion section 12 is input, the driving speed of the moving grate 16 in the combustion section 12 can be slowed down and the incinerated T on the combustion section 12 can be slowed down. The conveying speed can be sufficient for combustion.

As shown in FIG. 2 and FIG. 3, the fixed grate 15 and the moving grate 16 face upward in the conveying direction with respect to the mounting surfaces 11 a, 12 a, and 13 a of the drying section 11, the combustion section 12, and the post-combustion section 13. Tilt configuration. In addition, the grate 15 and 16 are arrange | positioned so that the front-end | tip of the grate 15, 16 may face the conveyance direction downstream side D1. Thereby, the moving grate 16 operates so that the incinerated material T on the fixed grate 15 is conveyed to the downstream D1 in the conveyance direction.

A part of the moving grate 16 of the drying section 11 is a protruding grate 16P (the others are ordinary grate described later). As shown in FIG. 2, the moving grate 16 having a range R1 from 50% to 80% of the length in the conveying direction of the drying section 11 from the downstream side in the conveying direction is a protruding grate 16P. By using the raised grate 16P, the stirring power can be increased.
As shown in FIG. 3, the protruding grate 16P includes a plate-shaped grate main body 25 and a triangular-shaped protrusion 26 provided at the front end of the grate main body 25. The protrusion 26 protrudes upward from the upper surface of the grate main body 25. The shape of the protrusion 26 is not limited to this, and may be, for example, a trapezoidal shape or a circular shape.
Here, the fixed grate 15 of FIG. 3 is a grate without a protrusion on the upper surface of the front end, and this shape is called a general grate.

It should be noted that, in the present embodiment, only the moving grate 16 is provided with the protruding grate 16P, but it is not limited thereto, and both the moving grate 16 and the fixed grate 15 may be provided with Protruding grate.
The range in which the raised grate 16P is provided is not limited to the above range. For example, all the grate in the drying section 11 may be provided with the raised grate 16P.
In addition, depending on the properties and types of the incinerated T, all grates (fixed grate and mobile grate) in the drying section may be set as ordinary grate.

As in the drying section 11, a part of the moving grate 16 in the combustion section 12 is a protruding grate 16P. Specifically, the moving grate 16 having a range R2 from 50% to 80% of the length in the conveying direction of the combustion section 12 from the downstream side in the conveying direction is a protruding grate 16P. The other moving grate 16 of the combustion section 12 is a common grate. As with the drying section, depending on the properties and types of the incinerated T, both the moving grate 16 and the fixed grate 15 may be provided with protruding grate, or all grate (fixed Both the grate and the mobile grate are set as ordinary grate.
As for the grate in the post-combustion section 13, FIG. 2 shows a case where the moving grate 16 and the fixed grate 15 are all ordinary grate, but it can also be used with the drying section 11 and the combustion section. 12 Similarly, a grate with protrusions is used.

Next, the hearth inclination angle (mounting angle) of the drying section 11, the combustion section 12, and the post-combustion section 13 will be described.
As shown in FIG. 2, the drying section 11 of the mechanical hearth 5 of the present embodiment is arranged to face downward. That is, the mounting surface 11a of the drying section 11 is inclined so that the downstream side in the conveying direction is lower. Specifically, the angle between the horizontal plane centered on the upstream end 11b of the drying section 11 and the conveying direction side of the mounting surface 11a, that is, the hearth tilt angle θ1 of the drying section 11 is -15 ° (negative 15 degrees) to Angle between -25 ° (minus 25 degrees).

The combustion section 12 of the mechanical hearth 5 of the present embodiment is arranged so as to face upward. That is, the mounting surface 12a of the combustion section 12 is inclined so that the downstream side in the conveying direction is high. Specifically, the angle between the horizontal plane centered on the upstream end 12b of the combustion section 12 and the conveying direction side of the mounting surface 12a, that is, the hearth tilt angle θ2 of the combustion section 12 is + 5 ° (plus 5 degrees) to + 15 ° (plus 15 degrees).

The post-combustion section 13 of the mechanical hearth 5 of the present embodiment is arranged so as to face upward. That is, the mounting surface 13a of the post-combustion section 13 is inclined so that it is higher on the downstream side in the conveying direction. Specifically, the angle between the horizontal plane centered on the upstream end portion 13b of the after-combustion section 13 and the conveying direction side of the mounting surface 13a, that is, the hearth inclination angle θ3 of the after-combustion section 13 is + 5 ° (plus 5 degrees). To + 15 ° (plus 15 degrees).

A stage (fall wall) 27 is formed between the drying section 11 and the combustion section 12. The end portion 11 c on the downstream side in the conveyance direction of the drying section 11 is formed to be higher in the vertical direction than the end portion 12 b on the upstream side in the conveyance direction of the combustion section 12.
Similarly, a stage (fall wall) 28 is formed between the combustion section 12 and the after-combustion section 13. The end portion 12 c on the downstream side in the conveyance direction of the combustion section 12 is formed to be higher in the vertical direction than the end portion 13 b on the upstream side in the conveyance direction of the post-combustion section 13.

Further, the end portion 12c on the downstream side in the conveying direction of the combustion section 12 and the end portion 13c on the downstream side in the conveying direction of the after combustion section 13 are disposed at substantially the same position in the vertical direction, or the end portion 13c of the after combustion section 13 It is arranged above the end portion 12 c of the combustion section 12. The mechanical hearth type incinerator 1 of the present embodiment is provided at the same position in the vertical direction with the end portion 12c on the downstream side in the conveying direction of the combustion section 12 and the end portion 13c on the downstream side in the conveying direction of the post-combustion section 13. example.

Next, the reason why the hearth inclination angle of the drying section 11 is set to an angle between -15 ° (minus 15 degrees) to -25 ° (minus 25 degrees) will be described.
The function of the drying section 11 is to more efficiently dry the water in the incinerated T by the radiant heat from the flame located above the incinerated T and the sensible heat from the primary air below the grate.
Here, compared with the sensible heat of the primary air, the radiant heat from the flame contributes a higher degree to drying, and the drying of the upper layer portion of the incinerated T is easier to advance.
Therefore, by using the stirring operation by the grate, the lower layer portion of the incinerated T is moved upward and replaced with the upper layer portion, thereby increasing the drying speed.
However, even if the stirring operation is performed, the drying stage 11 does not basically perform combustion. Therefore, it is necessary to ensure a length for sufficient evaporation of water. The longer the length, the larger the size of the device and the more expensive it is. Therefore, it is required to shorten the hearth length as much as possible.

When the absolute value of the inclination angle of the hearth is larger than the repose angle of the incinerated T, it will collapse due to its own weight, and the incinerated T layer will not be formed. Therefore, it cannot be configured as a mechanical hearth 5. On the other hand, when the absolute value of the inclination angle of the hearth is smaller than the repose angle of the incinerated T, although it can be configured as a mechanical hearth, the movement caused by the gravity of the incinerated T (movement caused by its own weight) cut back. When the mounting surface is inclined upward, that is, when the hearth inclination angle is a positive value (positive value), gravity acts in a direction that pushes the incinerator T back from the conveying direction.
When the amount of conveyance of the incinerated T by the mechanical hearth 5 is lower than the amount of the incinerated T injected, it becomes the conveyance limit and cannot be processed.

The optimal hearth inclination angle differs depending on the amount of the incinerated T and the moisture content of the incinerated T. Here, a case where a large amount of incinerated T is injected and a high water content (a large amount of water) is described as a case where the load of incinerated T is large. Conversely, a case where the amount of incinerated T to be input is small and the moisture content is low is a case where the load to be incinerated is small.

FIG. 4 shows an example in which the horizontal axis is the inclination angle of the hearth of the drying section 11 and the vertical axis is the necessary length of the hearth of the drying section 11, starting from the case (1) where the incineration load is maximum. In the case (4) where the incineration load is minimized, the relationship between the hearth tilt angle of the drying section 11 and the required hearth length of the drying section 11 is plotted.
Here, the required hearth length refers to a distance at which 95% of the moisture of the incinerated T to be injected is dried. The "repose angle" on the horizontal axis indicates the repose angle of the incinerated T.

As shown in the graph of FIG. 4, the hearth inclination angle of -30 ° is the limit for forming the T layer of the incinerated material. The hearth tilt angle that makes the hearth tilt angle relative to this layer becomes slower, so that the necessary hearth length is reduced accordingly, but when the hearth tilt angle turns to a positive value, the necessary hearth length gradually becomes longer. This is because when the hearth inclination angle becomes a positive value, the mounting surface faces upward and the conveying speed becomes slower. As a result, the incinerated T layer becomes thicker, and the incinerated T layer in the lower portion becomes difficult to dry. Advance.
From the four cases from the case where the load of the incinerated T is the largest (1) to the case where the load of the incinerated T is the smallest (4), it can be seen that no matter what the properties and quantity of the incinerated T are, Can be properly processed, and in terms of the hearth tilt angle of the optimal drying section 11 which can make the length of the hearth the shortest, -15 ° (minus 15 degrees) to -25 ° (minus 25 degrees) The angle between them is a proper range. The optimum value is -20 ° (minus 20 degrees).

Next, when the hearth tilt angle of the drying section 11 is set to an appropriate range as described above, it is suitable to set the hearth tilt angle of the combustion section 12 to + 5 ° (plus 5 degrees) to + 15 ° (plus The reason for the angle between 15 degrees) will be explained.
The function of the combustion section 12 is to use the radiant heat from the flame and the self-ignition heat to maintain the temperature of the T layer of the incinerated, and promote the generation of combustible gas caused by the thermal decomposition of volatile components, and the remaining after the thermal decomposition Combustion of fixed carbon.

Here, the time required for the combustion of the fixed carbon is longer than the time required for the volatilization of the volatile combustible gas. Therefore, the necessary hearth length of the combustion section 12 is determined by the time required for the combustion of the fixed carbon.

In FIG. 5, when the inclination angle of the hearth of the drying section 11 is set as an appropriate range as described above, the inclination angle of the hearth with the horizontal axis as the combustion section and the required hearth length with the vertical axis as the combustion section, The relationship between the inclination angle of the hearth of the combustion section and the required hearth length of the combustion section is plotted from the case where the incinerated load is maximized (1) to the case where the incinerated load is minimized (4). Here, the necessary hearth length of the combustion section refers to the distance at which 95% of the combustible components are volatilized or burned.

As shown in FIG. 5, the hearth inclination angle of -30 ° is the limit for forming the T layer of the incinerated material. The angle of inclination of the hearth which makes the angle limit with respect to this layer is slowed, so that the necessary hearth length is reduced accordingly. In consideration of the conveyance limit, an appropriate range of the hearth tilt angle can be set to a range surrounded by a chain line shown in FIG. 5.

In the drying section 11, even when the incineration load is large, since the hearth inclination angle of the drying section 11 is in a proper range, the drying section 11 can promote the reduction of the moisture content and volume of the refuse. Therefore, for example, even if the load in the drying section 11 is equivalent to (1), the load in the combustion section 12 may be changed to be equivalent to (3) and (4). Therefore, in the combustion section 12, it is possible to Use larger hearth tilt angles. That is, since the combustion stage can be directed upward, the residence time required for the combustion of fixed carbon can be secured, and the hearth length can be shortened.

In FIG. 6, the horizontal axis is the inclination angle of the hearth of the combustion section 12, and the vertical axis is the length of the hearth required for both the drying section 11 and the combustion section 12. From case (1) to case (4) in which the load of the incinerated T is the smallest, the hearth required for the furnace section 12 and the drying section 11 and the combustion section 12 are plotted. Relationship of length. Here, the hearth tilt angle of the drying section 11 is -20 ° (minus 20 degrees), which is an optimal value.

As shown in FIG. 6, it can be seen that, in consideration of the transportation limit, a suitable range of the hearth tilt angle of the combustion section 12 is an angle between + 8 ° (plus 8 degrees) and + 12 ° (plus 12 degrees). In addition, when the hearth inclination angle of the drying section 11 is -20 ° (minus 20 degrees), which is an optimal value, the optimal value of the hearth inclination angle of the combustion section 12 is + 10 ° (+10 degrees). .
With regard to the required hearth lengths of the drying section 11 and the combustion section 12, by setting the inclination angle of each hearth to an appropriate range, particularly to an optimal value, it is possible to set the hearth length as short as possible. Therefore, even if the after-combustion section 13 is included, it is possible to provide a mechanical hearth type incinerator with a small size and cost reduction.

According to the above-mentioned embodiment, the inclination of the drying section 11 is directed downward, so that no matter what kind of properties the incinerated T can be conveyed to the combustion section 12 without stagnation, the combustion section 12 and the post-combustion section 13 Inclined toward the top, the incinerated T does not easily slip or roll down downstream of the combustion section 12, so that the incinerated T is sufficiently burned and transported.

That is, in the case of a material that is easy to slide or incinerated T in a shape that is easy to roll, it is conveyed to the combustion section 12 early by rolling or the like in the drying section 11, and therefore, the drying section 11 cannot be dried sufficiently. Possibility. However, since the combustion section 12 and the post-combustion section 13 are inclined upward, the incinerated material T that rolls behind in the drying section 11 will not further roll down in the combustion section 12 and the post-combustion section 13 and will inevitably be sufficient in the combustion section 12 Dry and incinerated. Since the incinerated compound T having a high water content is not retained in the drying section 11 and is dried and transported to the combustion section 12, it is similarly necessary that the combustion section 12 is sufficiently incinerated.
Therefore, regardless of the properties of the incinerated T, the incinerated T can be continuously injected, and the incinerated T can be completely burned.

In addition, the end portion 13c on the downstream side in the conveying direction of the after-combustion section 13 is disposed substantially at the same position in the vertical direction as the end portion 12c on the downstream side in the conveying direction of the combustion section 12, or is disposed at a position that is longer than the end of the combustion section 12. The position of the part 12c is upward. Accordingly, even when the incinerated T is rolled down in the drying section 11 or the like, it is possible to prevent the incinerated T from being discharged from the post-combustion section 13 in a state where it is not sufficiently burned.

[Second Embodiment]
Hereinafter, a mechanical hearth type incinerator according to a second embodiment of the present invention will be described in detail with reference to the drawings. It should be noted that, in this embodiment, the differences from the first embodiment will be mainly described, and descriptions of the same portions will be omitted.
As shown in FIG. 7, there is no step (fall wall) between the combustion section 12 and the post-combustion section 13 of the mechanical hearth 5 of the present embodiment. That is, the combustion section 12 and the after-combustion section 13 of this embodiment are continuously connected. In other words, the end portion 12 c on the downstream side in the conveyance direction of the combustion section 12 and the end portion 13 b on the upstream side in the conveyance direction of the post-combustion section 13 are formed at the same height.

According to the above embodiment, even if the momentum of the incinerated T that rolls behind in the drying section 11 is strong and passes through the combustion section 12 with this momentum, it will stop at least in the post-combustion section 13 and will not be discharged from the post-combustion section 13. In addition, since the after-combustion stage 13 and the after-combustion stage 12 are continuously connected in stages, even if there is incinerated T that has not been burned sufficiently, it enters into the after-combustion stage 13 due to rolling or the like, and the incombustion is insufficient. The incinerated T can also be returned to the combustion section 12 and burned by its own weight. That is, it is possible to reduce the emission of the incinerated T which is not completely burned as much as possible.

As mentioned above, although embodiment of this invention was described in detail with reference to drawings, the specific structure is not limited to this embodiment, Design changes etc. are included in the range which does not deviate from the meaning of this invention.
It should be noted that, in the above embodiment, the front ends of the grate 15 and 16 are arranged to face the downstream D1 in the conveying direction, but the present invention is not limited to this. Upstream side in the conveying direction.

1‧‧‧ mechanical hearth incinerator

2‧‧‧ Hopper

3‧‧‧ Incinerator

4‧‧‧Supply

5‧‧‧ mechanical hearth

6‧‧‧wind chamber

7‧‧‧Supplier Platform

8‧‧‧Supply drive

9‧‧‧combustion chamber

10‧‧‧ blower

11‧‧‧ drying section

11a‧‧‧ Mounting surface of drying section

11b ‧‧‧ end on the upstream side of the drying section

11c‧‧‧ end on the downstream side of the drying section

12‧‧‧burning section

Installation surface of 12a‧‧‧combustion section

12b ‧‧‧ end on the upstream side of the combustion section

12c ‧‧‧ end on the downstream side of the combustion section

13‧‧‧ rear combustion section

13a‧‧‧ Mounting surface of rear combustion section

13b ‧‧‧ end of upstream side of afterburning section

13c ‧‧‧ end of downstream side of afterburning section

15‧‧‧ fixed grate

16‧‧‧ Mobile grate

16P‧‧‧ with protruding grate

17 ‧ ‧ ash export

18‧‧‧Drive mechanism

19‧‧‧ Liang

20‧‧‧Hydraulic cylinder

21‧‧‧arm

22‧‧‧ beam

23‧‧‧ bracket

25‧‧‧The main part of the hearth

26‧‧‧ protrusion

Phases 27, 28‧‧‧ (fall wall)

D‧‧‧ Conveying direction

D1‧‧‧ downstream side of conveying direction

Range of raised grate in R1‧‧‧ drying section

R2‧‧‧ Combustion section with protruding grate

T‧‧‧burned

θ1, θ2, θ3‧‧‧‧Inclination angle of hearth

FIG. 1 is a schematic configuration diagram of a mechanical hearth type incinerator according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a hearth inclination angle of the mechanical hearth type incinerator according to the first embodiment of the present invention.

3 is a side view illustrating a grate shape of the mechanical hearth type incinerator according to the first embodiment of the present invention.

FIG. 4 is a graph illustrating an appropriate range of an inclination angle of the hearth of the drying section, which is an angle between -15 ° and -25 °.

FIG. 5 is a graph illustrating that an appropriate range of the hearth tilt angle of the combustion section is an angle between + 5 ° and + 15 °.

FIG. 6 illustrates that the appropriate range of the hearth tilt angle of the combustion section is set to an angle between + 8 ° and + 12 °, and the optimum value is + 10 °, taking into consideration both the drying section and the combustion section. Chart for reasons.

FIG. 7 is a diagram illustrating a hearth inclination angle of a mechanical hearth-type incinerator according to a second embodiment of the present invention.

Claims (9)

A mechanical hearth type incinerator for incinerated combustion, which supplies incinerated material from a feeder and sequentially conveys it to a drying section, a combustion section, and a post-combustion section including a plurality of fixed grate and a plurality of mobile grate. The incinerator is a mechanical hearth type incinerator for drying, burning and post-combustion while performing incineration, which are characterized by: The drying section is arranged obliquely so that the downstream side in the conveying direction becomes downward, The combustion section is connected to the drying section and is disposed obliquely so that the downstream side in the conveying direction becomes upward, The post-combustion section is connected to the combustion section, and is disposed obliquely so that the downstream side in the conveying direction becomes upward. The mechanical hearth incinerator for incinerated combustion as described in the scope of patent application item 1, wherein, An end portion on the downstream side in the conveying direction of the after-combustion section is disposed in a vertical direction at a position substantially the same as an end portion on the downstream side in the conveying direction of the combustion section, or is disposed at: A position above the end of the combustion section. The mechanical hearth incinerator for incineration combustion as described in item 2 of the scope of patent application, wherein: The fixed grate and the mobile grate are arranged obliquely so that the mounting surfaces on the downstream side in the conveying direction with respect to the drying section, the combustion section, and the post-combustion section face upward. The mechanical hearth incinerator for incineration combustion as described in item 3 of the scope of patent application, wherein: The drying section, the combustion section, and the post-combustion section each have a driving mechanism that individually drives a plurality of the moving grate provided, The speed of the driving in the drying section, the combustion section, and the after-combustion section is set to the same speed as each other, or at least at least the drying section, the combustion section, and the after-combustion section. Some are set to different speeds. The mechanical hearth incinerator for incineration combustion as described in the scope of application for patent No. 4 wherein, The combustion section and the post-combustion section are continuously connected without a stage. The mechanical hearth incinerator for incinerated combustion as described in the scope of application for patents No. 4 or 5, wherein: At least a part of the plurality of moving grate in the drying section is a protruding grate provided with a protrusion at a front end. The mechanical hearth incinerator for incinerated combustion as described in the scope of application for patent No. 6 wherein, At least a part of the plurality of moving grate in the combustion section is a protruding grate provided with a protrusion at a front end. The mechanical hearth incinerator for combustion of incinerator as described in item 7 of the scope of patent application, wherein: The hearth tilt angle of the drying section is configured as an angle between -15 ° and -25 °, and the hearth tilt angle of the combustion section and the post-combustion section is configured as + 5 ° to + 15 ° Angle. The mechanical hearth incinerator for incineration combustion as described in item 8 of the scope of patent application, wherein: The hearth tilt angle of the drying section is -20 °, and the hearth tilt angle of the combustion section and the post-combustion section is + 10 °.