TWI683977B - 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 incinerator for incineration

The present invention relates to a mechanical hearth type incinerator for burning incinerated materials 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 thereof are cited here.

As an incinerator for incineration of incinerated waste and the like, there is known a mechanical hearth type incinerator that can efficiently perform incineration without sorting a large amount of incinerated materials. 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 achieve drying, combustion, Post-combustion functions.

In order to reliably burn the incinerated material, 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 that inclines the downstream side of the installation surface of all stages of the drying section, combustion section, and post-combustion section toward the downward direction . In addition, in the following, for example, the case where the downstream side of the installation surface of the drying section faces downward is simply referred to as the drying section facing downward (the same applies to the combustion section and the post-combustion section). In addition, as described in Patent Document 2, there is a case where the drying section is inclined downward and the combustion section and the post-combustion section are horizontally arranged. As described in Patent Document 3, there is a drying section and the combustion section inclined downward and the post-combustion section When the downstream side of the mounting surface in the conveying direction is inclined upward, there are cases where all parts as described in Patent Document 4 are inclined upward. It should be noted that, for example, the case where the downstream side of the mounting surface of the combustion stage faces upward is simply referred to as the combustion stage facing upward (the same applies to the drying stage and the post-combustion stage). [Prior Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 6-265125 Patent Literature 2: Japanese Shikai Hei 6-84140 Patent Document 3: Japanese Patent Publication No. 57-12053 Patent Document 4: Japanese Unexamined 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, water content) are put in, but for materials that are easy to slide or in a shape that is easy to roll, such as a spherical shape, the incinerator has a high water content In the case of incinerated substances (with a large amount of water), in any mechanical hearth type incinerator, it is difficult to incinerate the same as other incinerated substances.

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 horizontally arranged, the material or the material that is easy to slide Compared with other incinerated materials, the incinerated materials with easy-to-roll shape are transported to the post-combustion stage earlier. Therefore, there is a problem that the incinerated materials are not incinerated sufficiently but are left unburned. Be discharged.

In addition, in the mechanical hearth type incinerator described in Patent Document 4, since all the stages of the drying section, the combustion section, and the post-combustion section are inclined upward, the material that is easy to slide or the shape of the incinerated material that is easy to roll 3. The incinerated material with high water content will accumulate at the bottom of the stage (falling wall) between the feeder and the drying section and will not be easily transported to the combustion section. Therefore, there is the following problem: sometimes it is necessary to limit the input amount or Temporarily stop investing.

An object of the present invention is to provide a mechanical hearth type incinerator for incineration, such as garbage, in which incineration can be continuously charged regardless of the properties of the incineration, and the incineration can be completely burned. [Means to solve the problem]

According to the first aspect of the present invention, for a mechanical hearth type incinerator for burning incinerated materials such as garbage, the incinerated material is supplied from a feeder, and is burned in a drying section provided with a plurality of fixed grate and a plurality of mobile grate. The section and post-combustion section transport the incinerated materials in sequence, while performing drying, combustion and post-combustion mechanical hearth type incinerators, characterized in that the drying section is directed downstream in the transport direction The combustion section is connected to the drying section and is inclined so that the downstream side of the conveying direction becomes upward, and the post-combustion section is connected to the combustion section and connected by the The downstream side in the conveying direction is inclined so as to face upward.

According to such a configuration, by inclining the drying section downward, no matter what kind of incinerated material is transported to the combustion section without stagnation, and by inclining the combustion section and the post-combustion section upward, Therefore, after the combustion section, the incinerated materials can be fully burned and transported without easily slipping or rolling off. That is, in the case of a material that is easy to slide or a shape that is easy to roll, it is transported 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, since the combustion section and the post-combustion section are inclined upwards, the incinerated materials that roll after the drying section will not be transported early in the combustion section and the post-combustion section, etc., and will be transported early. incineration. Since the incinerated material with a high water content does not stay in the drying section, it is dried and transported to the combustion section. Therefore, in the same way, the combustion section will inevitably be fully incinerated. Thereby, regardless of the properties of the incinerated material, the incinerated material can be continuously put in, and the incinerated material can be completely burnt.

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

According to such a configuration, even if the incinerated material rolls down in the drying section, etc., it is possible to prevent the incinerated material from being discharged from the post-combustion section without being sufficiently combusted.

In the above-mentioned mechanical hearth incinerator, the fixed grate and the movable grate may be the downstream side of the conveying direction relative to the drying section, the combustion section, and the post-combustion The mounting surfaces of the segments are arranged obliquely upward.

According to such a configuration, the moving grate can be operated so as to convey the incinerator to the downstream side in the conveying direction while stirring the incinerator on the 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 drive mechanism that individually drives a plurality of the movable grate each provided , The speed of the drive in the drying section, the combustion section and the post-combustion section is set to the same speed as each other, or in the drying section, the combustion section and the post-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 characteristics of the incinerated substance input.

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

According to such a structure, it is possible to further incinerate the incinerated substance continuously.

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

According to such a structure, it is possible to improve the stirring effect of the incinerated material during the reciprocating movement of the mobile grate.

In the above-mentioned mechanical hearth incinerator, at least a part of the plurality of movable grate of the combustion section may be a grate with protrusions provided with protrusions at the front end.

In the above mechanical hearth type incinerator, the hearth inclination angle of the drying section may be configured at an angle between -15° and -25°, and the furnace in the combustion section and the post-combustion section The bed tilt angle is configured to be between +5° and +15°. In addition, the hearth inclination angle of the drying section may be configured to -20°, and the hearth inclination angle of the combustion section and the post-combustion section may be configured to +10°. According to such a structure, the necessary hearth length can be shortened, and therefore, it is possible to provide a mechanical hearth type incinerator that can be reduced in size and less costly. [Effect of the invention]

According to the present invention, regardless of the properties of the incinerated material, the incinerated material can be continuously charged, and the incinerated material can be completely burnt.

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

The feeder 4 pushes the incinerated substance T continuously supplied to the feeder platform 7 via the hopper 2 into the incinerator 3. The feeder 4 uses the feeder drive 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 a step shape. The incinerated substance T is burnt on the mechanical hearth 5. Hereinafter, the direction in which the incinerated substance T is transported is referred to as the transport direction D. The incinerated substance T is transported along the transport direction D on the mechanical hearth 5. In FIGS. 1, 2 and 3, the right side is the downstream side D1 in the conveying direction. In addition, the surface on which the grate 15, 16 is installed is referred to as the installation surface, and the upper end portion (11b, 12b, 13b) on the upstream side of the drying section, the combustion section, or the post-combustion section is formed by the horizontal plane and the installation surface The angle on the side of the conveying direction D is called the hearth tilt angle (installation angle). When the downstream side of the mounting surface in the transport direction is upward from the horizontal plane, the hearth tilt angle is set to a positive value, and when the downstream side of the mounting surface in the transport direction is facing downward from the horizontal plane, the furnace The bed tilt angle is set to a negative value, which will be described here.

The mechanical hearth 5 has, in order from the upstream side of the transport direction of the incinerated substance T, a drying section 11 for drying the incinerated substance T, a combustion section 12 for incineration of the incinerated substance T, and complete incineration of unburned components (post-combustion)的后烧段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 substance T is sequentially transferred, the 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 reciprocates along the transport direction D of the incinerated substance T. The reciprocating movement of the mobile grate 16 is used to transport the incinerated substance T on the mechanical hearth 5 and stir it. That is, the lower layer portion of the incinerated substance T is moved to be replaced with the upper layer portion.

The drying section 11 receives the incinerated substance T pushed out by the feeder 4 and dropped into the incinerator 3, evaporates the moisture of the incinerated substance T, and thermally decomposes a part. The combustion section 12 ignites the incinerated substance T dried by the drying section 11 by primary air supplied from the air chamber 6 below, and burns volatile components and fixed carbon components. The post-combustion section 13 combusts unburned components such as fixed carbon components that have passed through in the combustion section 12 without sufficient combustion until it is completely ashed. An ash outlet 17 is provided at the outlet of the post-combustion section 13. The ash is discharged from the incinerator 3 through the ash outlet 17.

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

The driving mechanism 18 is mounted on the beam 19 which is installed on the mechanical hearth 5. The drive mechanism 18 includes a hydraulic cylinder 20 attached to the beam 19, an arm 21 that is operated by the hydraulic cylinder 20, and a beam 22 connected to the front end of the arm 21. The beam 22 and the mobile 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 along with the movement of the arm 21, and move the beam 22 to drive the moving grate 16 connected to the beam 22.

The drive mechanism 18 of the present embodiment uses a hydraulic cylinder 20, but it is not limited thereto, and 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-mentioned form, as long as the movable grate 16 can reciprocate, and any form of drive mechanism may be used. For example, the cross beam 22 and the hydraulic cylinder 20 may be directly connected and driven without arranging the arm 21.

In the mechanical hearth incinerator 1 of this embodiment, the speed of driving the movable 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, in the case where an incineration substance T required to be sufficiently combusted in the combustion section 12 is input, the speed of driving the moving grate 16 of the combustion section 12 may be slowed down to slow down the incineration substance T on the combustion section 12 The conveying speed can fully burn.

As shown in FIGS. 2 and 3, the fixed grate 15 and the movable grate 16 are arranged such that the downstream side of the conveying direction faces the mounting surfaces 11a, 12a, and 13a of the drying section 11, the combustion section 12, and the post-combustion section 13 upward. Tilt configuration. In addition, the grate 15 and 16 are arrange|positioned so that the front end of the grate 15 and 16 may face the downstream D1 of a conveyance direction. As a result, the moving grate 16 is operated so as to convey the incinerated substance T on the fixed grate 15 to the downstream D1 in the conveying direction.

A part of the moving grate 16 of the drying section 11 is a grate 16P with protrusions (the other is a general grate described later). As shown in FIG. 2, among the lengths of the drying section 11 in the conveying direction, the moving grate 16 in the range R1 from the downstream side in the conveying direction to 50% to 80% is a grate with protrusions 16P. By using the grate 16P with protrusions, the stirring power can be increased. As shown in FIG. 3, the grate with protrusions 16P has a plate-shaped grate body 25 and a triangular protrusion 26 provided at the front end of the grate body 25. The protrusion 26 protrudes upward from the upper surface of the grate 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 with no protrusions on the upper surface of the front end, and this shape is referred to as a general grate.

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

Like the drying section 11, a part of the moving grate 16 of the combustion section 12 is a grate 16P with protrusions. Specifically, the moving grate 16 in the range R2 from the downstream side in the conveying direction to the range of 50% to 80% of the length of the combustion section 12 in the conveying direction is the grate with protrusions 16P. The other mobile grate 16 of the combustion section 12 is an ordinary grate. Similar to the drying section, depending on the properties and types of the incinerated substance T, both the movable grate 16 and the fixed grate 15 may be provided with protruding grate, or all the grate (fixed) Grate and mobile grate) are set as ordinary grate. Regarding the grate of the post-combustion section 13, in FIG. 2, it is shown that both the mobile grate 16 and the fixed grate 15 are all ordinary grate, but it can also be combined with the drying section 11 and the combustion section. 12 Similarly, a grate with protrusions is used.

Next, the hearth inclination angle (installation 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 this embodiment is arranged downward. That is, the mounting surface 11a of the drying section 11 is inclined so that the downstream side in the conveying direction is low. Specifically, the angle between the horizontal plane centering on the upstream end 11b of the drying section 11 and the conveying direction side of the mounting surface 11a, that is, the hearth inclination angle θ1 of the drying section 11 is -15° (minus 15 degrees) to Angle between -25° (minus 25 degrees).

The combustion section 12 of the mechanical hearth 5 of this embodiment is arranged upward. That is, the mounting surface 12a of the combustion section 12 is inclined so that the downstream side in the conveying direction is higher. Specifically, the angle between the horizontal plane centering on the upstream end 12b of the combustion section 12 and the conveyance direction side of the mounting surface 12a, that is, the hearth inclination 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 this embodiment is arranged upward. That is, the mounting surface 13a of the post-combustion stage 13 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 13b of the post-combustion section 13 and the conveyance direction side of the mounting surface 13a, that is, the hearth inclination angle θ3 of the post-combustion section 13 is +5° (positive 5 degrees) To an angle between +15° (plus 15 degrees).

A stage (falling 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 (falling wall) 28 is formed between the combustion section 12 and the post-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.

In addition, the end 12c on the downstream side in the transport direction of the combustion section 12 and the end 13c on the downstream side in the transport direction of the post-combustion section 13 are arranged at substantially the same position in the vertical direction, or the end 13c of the post-combustion section 13 It is arranged above the end 12c of the combustion section 12. The mechanical hearth incinerator 1 of the present embodiment is provided with the end 12c on the downstream side in the conveyance direction of the combustion section 12 and the end 13c on the downstream side in the conveyance direction of the post-combustion section 13 at the same position in the vertical direction example.

Next, the reason for setting the hearth inclination angle of the drying section 11 to an angle between -15° (minus 15 degrees) and -25° (minus 25 degrees) will be described. The function of the drying section 11 is to more efficiently dry the moisture in the incinerated material T from the radiant heat from the flame above the incinerated material 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 has a higher contribution to the drying, and the drying of the upper part of the incinerated substance T is easy to advance. Therefore, the stirring action by the grate moves the lower part of the incinerated substance T upward and replaces it with the upper part, thereby increasing the drying speed. However, even if the stirring operation is performed, combustion is basically not performed in the drying section 11, and therefore, it is necessary to ensure a sufficient length for moisture evaporation. The longer the length, the larger the equipment and the more expensive the cost. Therefore, it is required to shorten the hearth length as much as possible.

When the absolute value of the hearth inclination angle is larger than the angle of repose of the incinerated object T, it will collapse due to its own weight and the incinerated object T layer will not be formed. Therefore, the mechanical hearth 5 cannot be configured. On the other hand, when the absolute value of the hearth inclination angle is smaller than the angle of repose of the incinerated substance T, although it can be configured as a mechanical hearth, the movement due to the gravity of the incinerated substance T (movement due to its own weight) cut back. Furthermore, 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 back the incinerator T from the transport direction. When the transport amount of the incinerated substance T by the mechanical hearth 5 is lower than the amount of the incinerated substance T charged, it becomes the transport limit and cannot be processed.

The optimal hearth inclination angle varies according to the amount of incinerated substance T input and the moisture content of incinerated substance T. Here, the case where the amount of the incinerated substance T to be inputted is large and the water content is high (the water content is large) will be described as the case where the load of the incinerated substance to be inputted is large. Conversely, the case where the amount of incinerated substance T input is small and the moisture content is low is the case where the load of incinerated substance input is small.

Fig. 4 shows an example in which the horizontal axis is the hearth inclination angle of the drying section 11 and the vertical axis is the necessary hearth length of the drying section 11, starting from the case where the load of the incinerated substance is the largest (1) to The relationship between the hearth inclination angle of the drying section 11 and the necessary hearth length of the drying section 11 is drawn up to the case where the load of the incinerated material is the smallest (4). Here, the required hearth length refers to the distance at which 95% of the moisture of the incinerated substance T to be input is dried. The "angle of repose" on the horizontal axis represents the angle of repose of the incinerated substance T.

As shown in the graph of FIG. 4, the hearth tilt angle of -30° is the limit for the formation of the T layer of the incinerated material. The hearth tilt angle with respect to the limit of the formation of the layer is slowed, so that the necessary hearth length is reduced, but when the hearth tilt angle becomes positive, the necessary hearth length gradually becomes longer. This is because when the inclination angle of the hearth becomes a positive value, the mounting surface faces upward and the conveying speed becomes slower. As a result, the layer of incinerated substance T becomes thicker, and drying of the incinerated substance T in the lower layer becomes difficult Advance. It can be known from the four cases from the case where the load of the incinerated substance T input is the largest (1) to the case where the load of the incinerated substance T input is the smallest (4). , Can be properly processed, and as far as the hearth inclination angle of the optimal drying section 11 that can make the hearth length the shortest is -15° (minus 15 degrees) to -25° (minus 25 degrees) The angle between is an appropriate range. Also, the optimal value is -20° (minus 20 degrees).

Next, when the hearth inclination angle of the drying section 11 is set to an appropriate range as described above, it is suitable to set the hearth inclination angle of the combustion section 12 to +5° (positive 5 degrees) to +15° (positive The reason for the angle between 15 degrees) will be explained. The function of the combustion section 12 is to use radiant heat from the flame and spontaneous combustion heat to maintain the temperature of the T layer of the incinerated material, and to promote the generation of combustible gases caused by the thermal decomposition of volatile components, and the remaining after 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 hearth tilt angle of the drying section 11 is set to an appropriate range as described above, the horizontal axis is the hearth tilt angle of the combustion section, and the vertical axis is the necessary hearth length of the combustion section, The relationship between the hearth inclination angle of the combustion section and the necessary hearth length of the combustion section is drawn from the case where the load of the incinerated substance is the largest (1) to the case where the load of the incinerated substance is the smallest (4). Here, the necessary hearth length of the combustion section refers to the distance at which 95% of combustible components are volatilized or burned.

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

In the drying section 11, even when the load of the incinerated material is large, since the hearth inclination angle of the drying section 11 is within an appropriate range, the drying section 11 can promote the reduction of the moisture content and the volume of the garbage. Therefore, for example, even if the load in the drying section 11 is a load equivalent to (1), the load in the combustion section 12 will change to a load equivalent to (3) or (4). Therefore, in the combustion section 12, it is possible to Use a larger hearth tilt angle. 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 hearth inclination angle 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 the case where the load of the incinerated substance T charged is the smallest (4), the hearth inclination angle of the combustion section 12 and the hearth required for both the drying section 11 and the combustion section 12 are plotted The relationship of length. Here, the hearth inclination 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, considering the transportation limit, the appropriate range of the hearth inclination angle of the combustion section 12 is an angle between +8° (positive 8 degrees) and +12° (positive 12 degrees). In addition, when the hearth inclination angle of the drying section 11 is -20° (minus 20 degrees) as an optimal value, the optimum value of the hearth inclination angle of the combustion section 12 is +10° (+10 degrees) . Regarding the necessary hearth lengths of the drying section 11 and the combustion section 12, by setting the inclination angle of each hearth to an appropriate range, in particular, to an optimal value, it is possible to set the hearth length as short as possible Therefore, even if the post-combustion section 13 is included, it is possible to provide a mechanical hearth type incinerator that is small in size and capable of reducing costs.

According to the above embodiment, by inclining the drying section 11 downward, no matter what kind of incinerated substance T is, it can be transported to the combustion section 12 without stagnation, and by the combustion section 12 and the post-combustion section 13 Inclined toward the top, the incinerated substance T will not easily slide down or roll down downstream of the combustion section 12, so that the incinerated substance T is sufficiently burned and transported.

That is, in the case of a material that is easy to slide or an incinerated substance T in a shape that is easy to roll, since the drying section 11 rolls or the like and is transported to the combustion section 12 early, there is a possibility that the drying section 11 cannot be sufficiently dried. Possibility. However, since the combustion section 12 and the post-combustion section 13 are inclined upwards, the incinerated substance T after rolling in the drying section 11 will not further roll down in the combustion section 12 and the post-combustion section 13, and the combustion section 12 must be fully To dry and incinerate. Since the incinerated substance T having a high moisture content is dried without being stored in the drying section 11 and transported to the combustion section 12, the combustion section 12 must be sufficiently incinerated in the same manner. Thereby, regardless of the properties of the incinerated substance T, the incinerated substance T can be continuously charged, and the incinerated substance T can be completely burnt.

In addition, the end portion 13c on the downstream side in the conveyance direction of the post-combustion section 13 is arranged in the vertical direction at substantially the same position as the end portion 12c on the downstream side in the conveyance direction of the combustion section 12, or at the end than the end of the combustion section 12 The portion 12c is located above. Thereby, even if the incinerated substance T rolls off in the drying section 11 or the like, it is possible to prevent the incinerated substance T from being discharged from the post-combustion section 13 without being sufficiently combusted.

[Second embodiment] Hereinafter, a mechanical hearth 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, differences from the first embodiment described above will be mainly described, and description of the same parts will be omitted. As shown in FIG. 7, there is no step (falling wall) between the combustion section 12 and the post-combustion section 13 of the mechanical hearth 5 of this embodiment. That is, the combustion section 12 and the post-combustion section 13 of this embodiment are continuously connected. In other words, the end 12c on the downstream side in the conveyance direction of the combustion section 12 and the end 13b on the upstream side in the conveyance direction of the post-combustion section 13 are formed at the same height.

According to the above-described embodiment, even if the momentum of the incinerator T after the drying section 11 rolls 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 post-combustion section 13 and the combustion section 12 are continuously connected in stages without steps, even if an incinerated substance T that has not been sufficiently burnt enters the post-combustion section 13 due to rolling or the like, the insufficient combustion The incinerated substance T can also be returned to the combustion section 12 by its own weight and combusted. That is, it is possible to minimize the discharge of the incinerated substance T that has not been completely burned.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like that do not deviate from the scope of the present invention. In addition, in the above embodiment, the front ends of the grate 15 and 16 are arranged toward the downstream D1 in the conveying direction, but it is not limited to this. For example, the front ends of the grate 15 and 16 of the drying section 11 may be arranged The upstream side of the conveying direction.

1‧‧‧Mechanical hearth incinerator 2‧‧‧hopper 3‧‧‧Incinerator 4‧‧‧supplier 5‧‧‧Mechanical hearth 6‧‧‧wind room 7‧‧‧ feeder platform 8‧‧‧Driver for feeder 9‧‧‧combustion chamber 10‧‧‧Blower 11‧‧‧ drying section 11a‧‧‧Dry section installation surface 11b‧‧‧End of the upstream side of the drying section 11c‧‧‧End of the downstream side of the drying section 12‧‧‧Burning section 12a‧‧‧Burning section installation surface 12b‧‧‧End of the upstream side of the combustion section 12c‧‧‧End of the downstream side of the combustion section 13‧‧‧Combustion section 13a‧‧‧Installation surface of the rear combustion section 13b‧‧‧End of the upstream side of the post-combustion section 13c‧‧‧End of the downstream side of the post-combustion section 15‧‧‧Fixed grate 16‧‧‧Mobile grate 16P‧‧‧Grate with raised 17‧‧‧ Ash residue 18‧‧‧Drive mechanism 19‧‧‧ Liang 20‧‧‧Hydraulic cylinder 21‧‧‧arm 22‧‧‧beam 23‧‧‧Bracket 25‧‧‧Grate main body 26‧‧‧protrusion 27, 28‧‧‧ stage (falling wall) D‧‧‧Conveying direction D1‧‧‧ Downstream side of conveying direction R1‧‧‧ Range with raised grate in drying section R2‧‧‧ Range of grate with protrusion in the combustion section T‧‧‧Incinerated θ1, θ2, θ3 ‧‧‧ hearth tilt angle

FIG. 1 is a schematic configuration diagram of a mechanical hearth incinerator according to a first embodiment of the present invention. 2 is a diagram illustrating a hearth inclination angle of the mechanical hearth incinerator according to the first embodiment of the present invention. 3 is a side view illustrating the grate shape of the mechanical hearth incinerator according to the first embodiment of the present invention. Fig. 4 is a graph illustrating an appropriate range of the hearth tilt angle of the drying section between -15° and -25°. FIG. 5 is a graph illustrating an appropriate range of the hearth inclination angle of the combustion section from +5° to +15°. FIG. 6 illustrates that the appropriate range of the hearth inclination angle of the combustion section is set to an angle between +8° and +12°, and the optimal value is +10°, considering both the drying section and the combustion section Chart of the reasons. 7 is a diagram illustrating a hearth inclination angle of a mechanical hearth incinerator according to a second embodiment of the present invention.

4‧‧‧supplier

5‧‧‧Mechanical hearth

7‧‧‧ feeder platform

11‧‧‧ drying section

11a‧‧‧Dry section installation surface

11b‧‧‧End of the upstream side of the drying section

11c‧‧‧End of the downstream side of the drying section

12‧‧‧Burning section

12a‧‧‧Burning section installation surface

12b‧‧‧End of the upstream side of the combustion section

12c‧‧‧End of the downstream side of the combustion section

13‧‧‧Combustion section

13a‧‧‧Installation surface of the rear combustion section

13b‧‧‧End of the upstream side of the post-combustion section

13c‧‧‧End of the downstream side of the post-combustion section

15‧‧‧Fixed grate

16‧‧‧Mobile grate

16P‧‧‧Grate with raised

27, 28‧‧‧ stage (falling wall)

D‧‧‧Conveying direction

D1‧‧‧ Downstream side of conveying direction

R1‧‧‧ Range with raised grate in drying section

R2‧‧‧ Range of grate with protrusion in the combustion section

θ1, θ2, θ3 ‧‧‧ hearth tilt angle

Claims (8)

A mechanical hearth-type incinerator for incineration of incinerated materials is supplied from a feeder, and is transported sequentially in a drying section, a combustion section, and a post-combustion section provided with a plurality of fixed grate and a plurality of mobile grate. The incinerated material is a mechanical hearth type incinerator for incineration material burning while performing drying, combustion and post-combustion respectively, characterized in that the drying section is inclinedly arranged such that the downstream side in the conveying direction is downward , The combustion section is connected to the drying section and is arranged obliquely so that the downstream side in the conveying direction becomes upward, and the post-combustion section is connected to the combustion section and is downstream in the conveying direction Be arranged obliquely upward; the end of the post-combustion section on the downstream side in the conveyance direction is arranged in the vertical direction at the same as the end of the combustion section on the downstream side in the conveyance direction , Or arranged at a position above the end of the combustion section. The mechanical hearth type incinerator for incineration combustion as described in item 1 of the scope of the patent application, wherein the fixed grate and the mobile grate are relative to the drying section on the downstream side in the conveying direction , The mounting surfaces of the combustion section and the post-combustion section are inclined so as to face upward. The mechanical hearth type incinerator for incineration combustion as described in item 2 of the scope of the patent application, wherein the drying section, the combustion section and the post-combustion section each have their own drive A plurality of driving mechanisms of the mobile grate set the driving speeds in the drying section, the combustion section, and the post-combustion section to the same speed as each other, or in the drying section, all At least a part of the combustion section and the post-combustion section are set to different speeds. The mechanical hearth type incinerator for incineration combustion as described in item 3 of the patent application range, wherein the combustion section and the post-combustion section are continuously connected without a stage. The mechanical hearth incinerator for incineration combustion as described in item 3 or 4 of the patent application scope, wherein at least a part of the plurality of movable grate of the drying section is provided with a protrusion at the front end Protruding grate. The mechanical hearth type incinerator for incineration combustion according to item 5 of the patent application scope, wherein at least a part of the plurality of movable grate of the combustion section is a protruding furnace with protrusions provided at the front end Grate. The mechanical hearth incinerator for incineration combustion as described in item 6 of the scope of the patent application, wherein the inclination angle of the hearth of the drying section is configured at an angle between -15° and -25°, The hearth tilt angle of the combustion section is configured to be an angle between +8° and +12°, and the hearth tilt angle of the post-combustion section is the same as the hearth tilt angle of the combustion section. The mechanical hearth incinerator for incineration combustion as described in item 7 of the patent application scope, wherein the hearth inclination angle of the drying section is -20°, and the hearth inclination angle of the combustion section is +10 °.

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