JP7137333B2 - waste incinerator - Google Patents

Description

The present invention relates to a waste incinerator for incinerating waste such as general waste and industrial waste.

2. Description of the Related Art Conventionally, as a waste incinerator, a stoker-type incinerator provided with an incinerator that incinerates while transporting waste with a plurality of arranged fire grates (stoker) is generally employed. Also, as a stoker-type incinerator, the unburned components generated in the waste incineration process are flowed to the downstream side of the combustion chamber along the direction of transport of the waste, and then deflected upward, so-called parallel flow system. is known (see, for example, Patent Document 1).

In a stoker-type incinerator, air for secondary combustion is generally supplied to the combustion chamber in order to completely burn unburned components and reduce harmful substances such as NOx and dioxins. According to the parallel flow incinerator, the flow of combustion gas containing unburned components is forcibly deflected by the structure of the flow path, thereby promoting agitation and mixing of combustion gas and secondary combustion air. This has the advantage that the unburned components can be burned with a smaller amount of secondary combustion air.

JP 2015-090221 A

On the other hand, in the parallel flow type incinerator, by deflecting the combustion gas flow, in the reburning chamber into which this combustion gas flow flows, a biased flow velocity distribution is created in which the flow velocity increases in the area outside the deflected portion. occur. As a result, it may not be possible to secure a sufficient residence time in the afterburning chamber to burn the unburned components in the combustion gas.

Therefore, in order to solve the above problems, the object of the present invention is to eliminate the imbalance of the combustion gas flow rate in the reburning chamber and ensure a sufficient residence time, thereby ensuring the removal of unburned components in the combustion gas. To provide a waste incinerator capable of combusting waste into

In order to achieve the above object, a waste incinerator according to the present invention is connected to an incinerator for incinerating waste while conveying the waste in a substantially horizontal direction, and a combustion chamber in which the incinerator is arranged. A reburning chamber for reburning the unburned components in the combustion gas generated in the reburning chamber, which extends in a direction inclined upward from the downstream part of the combustion chamber and toward the upstream side of the combustion chamber. A combustion chamber and an injection section for injecting a flow rate adjusting gas in a direction along a side wall of the reburning chamber from a downstream portion to an upstream portion of the reburning chamber. In this specification, the term "flow rate adjusting gas" means gas that is injected into the recombustion chamber for the purpose of adjusting the imbalance in the flow rate distribution of the combustion gas in the recombustion chamber.

According to this configuration, in the parallel-flow incinerator that forcibly deflects the combustion gas, by injecting the gas for adjusting the flow velocity from the injection part, the deviation of the flow velocity distribution of the combustion gas in the reburning chamber is adjusted. be able to. As a result, it is possible to sufficiently secure the residence time of the combustion gas in the reburning chamber, and to reliably burn the unburned components in the combustion gas.

In one embodiment of the present invention, an injection portion may be provided on a rear wall extending vertically upward from the most downstream portion of the recombustion chamber. According to this configuration, since the flow rate adjusting gas is injected from the most downstream portion of the recombustion chamber, it is possible to efficiently ensure the residence time of the combustion gas. In addition, the injection section can be provided without significantly changing the structure of the conventional waste incinerator.

In one embodiment of the present invention, the injection section may be configured to inject the flow rate adjusting gas along the lower side wall of the recombustion chamber. According to this configuration, a swirling flow can be generated in the recombustion chamber by injecting the flow rate adjusting gas into the lower region where the flow rate decreases. Therefore, by utilizing the deflected flow of the combustion gas, it is possible to effectively secure the residence time of the combustion gas while suppressing the injection amount of the flow rate adjusting gas.

In one embodiment of the present invention, only a lower portion of the rear wall corresponding to a low speed region, which is a region lower than the average flow velocity of the combustion gas stream in the reburning chamber, may be provided with an injection portion. If the range of the low speed region in the reburning chamber is constant and can be assumed, this configuration can effectively secure the residence time of the combustion gas with a simple structure.

In one embodiment of the present invention, a flow velocity distribution measuring device for measuring the flow velocity distribution of the combustion gas flow in the recombustion chamber, wherein a plurality of the injection parts are spaced apart in the height direction of the rear wall, and It may further include a control device that selects an injection unit for injecting the flow rate adjusting gas based on the measurement result of the flow rate distribution measuring device. According to this configuration, it is possible to perform optimum injection according to the flow velocity distribution in the recombustion chamber, and it is possible to effectively secure the retention time of the combustion gas with a necessary and sufficient amount of gas injection.

In one embodiment of the present invention, an auxiliary injection section is provided on the upstream front wall of the recombustion chamber and injects the flow rate auxiliary adjustment gas downstream along the upper side wall of the recombustion chamber. may further include According to this configuration, the swirling flow state in the recombustion chamber is controlled by injecting the auxiliary flow control gas in the opposite direction to the flow control gas to the upper side of the recombustion chamber where the flow control gas is not injected. becomes easier. This makes it possible to efficiently secure the desired residence time of the combustion gas.

An embodiment of the present invention may further include an adjusting device that adjusts the injection amount of the flow rate assisting adjusting gas according to the amount of waste incinerated by the incinerator. According to this configuration, a desired swirl flow can be maintained with a necessary and sufficient amount of gas by adjusting the injection amount of the flow velocity auxiliary adjusting gas according to the waste treatment load.

In one embodiment of the invention, the injection part and/or the auxiliary injection part may be provided as a nozzle. According to this configuration, since the directivity of each gas to be injected is enhanced, the unburned components in the combustion gas can be burned more efficiently.

As described above, according to the waste incinerator of the present invention, by eliminating the imbalance of the combustion gas flow rate in the reburning chamber and ensuring a sufficient residence time, the unburned components in the combustion gas can be reliably removed. can be burned to

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the waste incinerator based on 1st Embodiment of this invention. FIG. 2 is a side view schematically showing the schematic configuration and action of the waste incinerator of FIG. 1; FIG. 2 is a front view showing an example of an arrangement of injection nozzles of the waste incinerator of FIG. 1; FIG. 3 is a front view showing another example of the arrangement of injection nozzles of the waste incinerator of FIG. 1; It is a side view which shows schematic structure of the modification of the waste incinerator of FIG. It is a side view showing a waste incinerator according to a second embodiment of the present invention. FIG. 7 is a front view showing an example of an arrangement of injection nozzles of the waste incinerator of FIG. 6;

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments according to the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments.

FIG. 1 shows a waste incinerator 1 according to a first embodiment of the invention. In the waste incinerator 1, the waste W to be incinerated input from the input port 3 is incinerated by the incinerator 7 installed in the combustion chamber 5, and the waste W is incinerated by the incinerator 7. Unburned components contained in the generated combustion gas BG are reburned in a reburning chamber 9 connected downstream of the combustion chamber 5 . The high-temperature combustion gas combusted in the afterburning chamber 9 is used as a heat source for a heating device (not shown) such as a boiler connected downstream of the afterburning chamber 9 . The incinerator 7 incinerates the waste W while conveying it in a substantially horizontal direction (the direction from the left side to the right side in the drawing). Ash generated by incinerating the waste W in the incinerator 7 is discharged from the discharge chute 11 .

In this specification, the “substantially horizontal direction” as the transport direction of the waste W includes not only the horizontal direction but also the direction including the horizontal component. Therefore, for example, a conveying direction inclined from the horizontal direction to the vertical direction is also included in the above-mentioned “substantially horizontal direction”. Further, as will be described later, in the case where the incinerator 7 is composed of a plurality of stokers arranged, even if there is a portion where the waste W moves vertically downward between adjacent stokers, the entire incinerator 7 , (that is, from the upstream end to the downstream end of the incinerator 7), if the transport direction of the waste W includes a horizontal component, it is included in the “substantially horizontal direction”.

Specifically, the incinerator 7 is configured as a stoker-type incinerator in which a plurality of fire grates (stokers) are arranged side by side along the direction in which the waste W is conveyed. The incinerator 7 is divided into three blocks, a drying block 7a, a combustion block 7b, and a post-combustion block 7c, in order from the upstream side. The drying block 7a dries the waste W input from the input port 3, the combustion block 7b burns the dried waste W, and the post-combustion block 7c unburns the waste W that has not been burned in the combustion block 7b. of the combustion residue. Each block of the incinerator 7 is supplied with primary air A1 from below.

Since the afterburning chamber 9 is connected to the downstream end of the combustion chamber 5 in which the incinerator 7 is installed in the conveying direction of the incinerator 7, the combustion gas containing the unburned components generated in the combustion chamber 5 The BG flows in the combustion chamber 5 substantially parallel to the direction in which the waste W is conveyed. The incinerator 1 is configured as a so-called parallel incinerator having such a structure.

An upper portion of the combustion chamber 5 on the upstream side is covered with a top wall 13 that protrudes upward. In the illustrated example, the upper wall 13 is inclined upward toward the downstream side. A post-combustion chamber 9 is connected to the downstream portion of the combustion chamber 5, that is, the upper portion of the portion where the post-combustion block 7c is arranged. The afterburning chamber 9 extends from the downstream portion of the combustion chamber 5 in a direction inclined upward and toward the upstream side of the combustion chamber 5 . An intermediate portion of the combustion chamber 5 between the upper wall 13 and the lower side wall 25 of the reburning chamber 9, that is, approximately above the combustion block 7b, is recessed downward from the upper wall 13 to form the reburning chamber 9. An intermediate wall 15 is provided which continues to the lower side wall 25 . An exhaust passage 17 extends substantially vertically upward from the downstream end of the reburning chamber 9 to send the high-temperature exhaust gas EG burned in the reburning chamber 9 to the heating device.

Note that the specific configuration of the combustion chamber 5 is not limited to the illustrated example. For example, the upper wall 13 is not limited to the illustrated example, and may extend horizontally or may slope downward toward the downstream side. Also, the intermediate wall 15 may not be provided.

The upper wall 13 and the intermediate wall 15 of the combustion chamber 5 are provided with secondary air injection nozzles 19 for injecting secondary air A2 to be mixed with the combustion gas BG inside the combustion chamber 5 .

In the waste incinerator 1 of the present embodiment, an injection nozzle 21 is provided as an injection portion for injecting the flow rate adjusting gas AG in a direction along the side wall of the reburning chamber 9 from the downstream portion to the upstream portion of the reburning chamber 9. is provided.

More specifically, an injection nozzle 21 is provided on a rear wall 23 extending vertically upward from the most downstream portion of the recombustion chamber 9 . In the illustrated example, the rear wall 23 of the afterburning chamber 9 is formed by the upstream end of a substantially vertical wall facing the flow of the combustion gas BG in the exhaust passage 17 .

The injection nozzle 21 is configured to be able to inject the flow rate adjusting gas AG along the lower side wall 25 of the recombustion chamber 9 . In the illustrated example, the injection nozzles 21 are provided in a predetermined range on the lower side of the rear wall 23, for example, in a substantially lower half region. Each injection nozzle 21 is oriented parallel to the wall surface of the lower side wall 25 of the reburning chamber 9 .

In the parallel flow type waste incinerator 1, as shown in FIG. This deflection promotes mixing of the combustion gas BG with the secondary air A2. However, due to this deflection, the flow velocity distribution is biased in the height direction (the direction perpendicular to the wall surface of the lower side wall 25 of the reburning chamber 9) H1 within the reburning chamber 9 . That is, there occurs a biased flow velocity distribution in which the flow velocity in the upper region of the reburning chamber 9, which is the outside of the deflected portion, increases (state A in the figure). In this case, the combustion gas BG passing through the upper region of the reburning chamber 9 cannot obtain a sufficient residence time. Therefore, in the present embodiment, in the recombustion chamber 9, the flow velocity adjusting gas AG is injected in the direction opposite to the flow direction of the combustion gas BG into the lower area where the flow velocity of the combustion gas BG is reduced, so that the combustion in the upper area is A swirling flow S involving the gas BG is generated, and the flow velocity of the combustion gas BG passing through the upper region is reduced (state B in the figure). As a result, it is possible to suppress unevenness in the flow velocity distribution of the combustion gas BG within the cross section of the reburning chamber 9 and to ensure a sufficient residence time of the combustion gas BG within the reburning chamber 9 . The flow velocity of the flow rate adjusting gas AG injected from the injection nozzle 21 is made equal to or lower than the average flow velocity of the combustion gas BG in the reburning chamber 9 . The flow velocity of the flow rate adjusting gas AG is controlled by controlling the flow rate of the flow rate adjusting gas AG injected from the injection nozzle 21, for example.

Therefore, when the type and amount of waste W to be incinerated are within a predetermined range, and a predetermined low speed region (for example, a region below the average flow speed) in which the flow rate adjustment gas AG should be injected in the reburning chamber 9 can be roughly specified. can be provided with injection nozzles 21 only in the lower part of the rear wall 23 corresponding to the low speed region in the reburning chamber 9 .

In this embodiment, as shown in FIG. 3, a plurality of (four in the illustrated example) injection nozzles 21 are arranged in a substantially lower half region of the rear wall 23 in the width direction of the rear wall 23 (that is, the recombustion chamber 9). width direction) WI at equal intervals. However, the number and arrangement of the injection nozzles 21 in the region where the injection nozzles 21 are to be provided are not limited to this example. For example, as shown in FIG. 4, the vertical positions of the plurality of injection nozzles 21 arranged in the width direction WI of the rear wall 23 may be alternately shifted.

According to the waste incinerator 1 according to the first embodiment described above, in the parallel-flow incinerator 7 that forcibly deflects the combustion gas BG, by injecting the gas for adjusting the flow velocity from the injection nozzle 21, , the deviation of the flow velocity distribution of the combustion gas BG in the reburning chamber 9 can be adjusted. As a result, a sufficient residence time of the combustion gas BG in the afterburning chamber 9 can be ensured, and the unburned components in the combustion gas BG can be reliably burned. In particular, in this embodiment, the injection nozzles 21 are provided only in the lower portion of the rear wall 23 corresponding to the low speed region, which is the region lower than the average flow velocity of the combustion gas BG flow in the recombustion chamber 9 . If the range of the low speed region in the reburning chamber 9 is constant and can be assumed, such a configuration can effectively secure the residence time of the combustion gas BG with a simple structure.

As a modification of the present embodiment, as shown in FIG. 5, an auxiliary injection nozzle 31 may be further provided as an auxiliary injection portion on the front wall 27 on the upstream side of the recombustion chamber 9 . The auxiliary injection nozzle 31 injects the flow velocity auxiliary adjusting gas SG along the upper side wall 33 of the reburning chamber 9 toward the downstream side of the reburning chamber 9 .

When the auxiliary injection nozzle 31 is provided, an adjustment device 35 that adjusts the injection amount of the flow velocity auxiliary adjustment gas SG according to the amount of waste incinerated by the incinerator 7 may be provided.

The auxiliary injection nozzle 31 injects the auxiliary flow control gas SG in the opposite direction to the flow control gas AG into the upper region of the recombustion chamber 9 where the flow control gas AG is not injected. It becomes easy to control the state of the swirling flow S. In particular, when the incineration processing load of the incinerator 7 is lower than expected, it is possible to maintain the desired swirling flow S by injecting the flow velocity auxiliary adjusting gas SG. This makes it possible to efficiently secure the desired residence time.

As shown in FIG. 1, as the flow rate adjusting gas AG injected from the injection nozzle 21, a flow rate adjusting air supply passage 43 is provided by branching from the supply passage 41 for the secondary air A2. It uses part of the air. However, the supply system of the flow rate adjusting gas AG is not limited to this example, and for example, the flow rate adjusting gas AG may be supplied from a supply source independent of the secondary air A2. Further, the flow rate adjusting gas AG is not limited to air. For example, the exhaust gas EG discharged through the exhaust passage 17 from a supply source independent of the secondary air A2 may be used as the flow rate adjusting gas AG. Similarly to the flow rate adjusting gas AG, the auxiliary flow rate adjusting gas SG (FIG. 5) injected from the auxiliary injection nozzle 31 is not limited to the above examples. can be done.

FIG. 6 shows a waste incinerator 1 according to a second embodiment of the invention. The waste incinerator 1 according to this embodiment has the same basic configuration as that of the first embodiment except for the configuration for injecting the flow rate adjusting gas AG into the reburning chamber 9 . The configuration for injecting the flow rate adjusting gas AG into the recombustion chamber 9 is common to the first embodiment in that an injection nozzle 21 is provided on the rear wall 23 of the recombustion chamber 9. Instead of providing injection nozzles 21 only at predetermined positions, a plurality of injection nozzles 21 are provided spaced apart in the height direction H2 of the rear wall 23, and the flow velocity distribution of the combustion gas BG flow in the recombustion chamber 9 is improved. and a control device 47 for selecting the injection nozzle 21 for injecting the flow velocity adjusting gas AG based on the measurement result of the flow velocity distribution measuring device 45. . In the following, points different from the first embodiment will be mainly described, and descriptions of points common to the first embodiment will be omitted.

As shown in FIG. 7, in this embodiment, a plurality of (three in this example) injection nozzles 21 are provided on the rear wall 23 of the recombustion chamber 9 so as to be spaced apart in the height direction H2 of the rear wall 23. ing. In the illustrated example, a plurality (four in this example) of injection nozzles 21 are provided at the same position in the height direction H2 and are spaced apart at equal intervals in the width direction of the rear wall 23 (the width direction of the recombustion chamber 9) WI. A plurality of injection nozzle rows 21R are arranged in the height direction H2 and are indicated by dashed lines.

Further, as shown in FIG. 6, in the present embodiment, the reburning chamber 9 is provided with a flow velocity distribution measuring device 45 for measuring the flow velocity distribution in the height direction H1 of the reburning chamber 9 . As the flow velocity distribution measuring device 45, for example, an oxygen concentration meter can be used. Furthermore, the waste incinerator 1 is provided with a control device 47 that selects the injection nozzle 21 for injecting the flow rate adjusting gas AG based on the measurement result of the flow rate distribution measuring device 45 .

In the waste incinerator 1 according to the present embodiment, the flow velocity distribution measuring device 45 measures the flow velocity distribution of the combustion gas BG in the height direction H1 of the reburning chamber 9, and based on the measurement result, the control device 47 , the flow velocity adjusting gas AG is selectively injected from injection nozzles 21 provided at positions corresponding to a predetermined low speed region (for example, a region below the average flow speed).

When an oxygen concentration meter is used as the flow velocity distribution measuring device 45, it is thought that the portion where the oxygen concentration is low is the point where the combustion is promoted and the gas flow velocity is high, and conversely, the portion where the oxygen concentration is high is the point where the combustion is poor and the gas flow velocity is low. This relationship is used to measure the flow velocity distribution.

In addition, it is also possible to control the flow rate of the flow rate adjusting gas AG injected from each injection nozzle 21 by using an oxygen concentration meter as the flow velocity distribution measuring device 45 and other devices such as a flow velocity meter and a carbon monoxide concentration meter. can.

An example of control in which three of the CO concentration meter, the temperature measuring device, and the oxygen concentration meter are interlocked will be described below. These measuring devices are arranged, for example, at the outlet of the afterburning chamber 9 . When the CO concentration measured by the CO concentration meter is lower than a predetermined threshold, the current injection amount is maintained, and when the CO concentration is higher than the threshold, the flow rate of each injection nozzle 21 is controlled as follows. If the temperature in the afterburning chamber 9 measured by the temperature measuring device is below a predetermined temperature (e.g. 850°C) and the oxygen concentration is higher than the set value, the amount of air is excessive, so the supply amount of the flow rate adjusting gas AG is reduced, This promotes an increase in the temperature inside the afterburning chamber 9 . For the same reason (promoting an increase in the room temperature), even if the temperature in the afterburning chamber 9 is below a predetermined temperature (e.g. 850°C) and the oxygen concentration is lower than the set value, the gas supply rate is reduced. The amount of supply will be maintained at the current level without any processing to increase it. If the temperature in the recombustion chamber 9 is higher than a predetermined temperature (850° C., for example) and the oxygen concentration is lower than the set value, the air is insufficient, so the injection nozzle 21 is opened to increase the amount of air. If the oxygen concentration is higher than the set value, the current state is maintained to promote combustion.

Also in this embodiment, an auxiliary injection nozzle 31 may be further provided on the front wall 27 on the upstream side of the recombustion chamber 9, as in the modification shown in FIG.

According to the waste incinerator 1 according to the second embodiment described above, as in the first embodiment, in the parallel-flow waste incinerator 1 in which the combustion gas BG is forcibly deflected, the flow velocity from the injection nozzle 21 is By injecting the adjusting gas AG, it is possible to adjust the deviation of the flow velocity distribution of the combustion gas BG in the reburning chamber 9 . As a result, the imbalance in the flow velocity distribution of the combustion gas BG within the cross section of the reburning chamber 9 can be suppressed, and the residence time of the combustion gas BG in the reburning chamber 9 can be sufficiently secured. It is possible to reliably burn the unburned components inside. In particular, in the present embodiment, the injection nozzle 21 for injecting the flow rate adjusting gas AG is selected based on the measurement results of the flow rate distribution measuring device 45, so optimum injection is performed according to the flow rate distribution in the recombustion chamber 9. Therefore, the residence time of the combustion gas BG can be effectively ensured with a necessary and sufficient amount of gas injection.

In both the first embodiment and the second embodiment, as shown in FIG. 1 or FIG. A possible configuration example has been described. As described above, this configuration is preferable in that the swirling flow S can be generated in the recombustion chamber 9 . Even if it is configured to be able to inject the gas AG, it is possible to obtain a certain effect of lengthening the residence time of the combustion gas BG.

Further, in both the first embodiment and the second embodiment, the suppression of the bias in the flow velocity distribution of the combustion gas BG is achieved by adjusting the flow rate adjustment gas AG from the injection nozzle 21 so as to generate the swirling flow as described above. In addition to injection, in order to cancel the deviation of the flow velocity distribution of the combustion gas BG, the injection amount of the flow rate regulating gas AG is increased for the portion where the flow velocity distribution is large, and the flow rate regulating gas AG is injected for the portion where the flow velocity distribution is small. It may be performed by configuring and controlling so as to reduce the injection amount of .

Also, in both the first embodiment and the second embodiment, an example in which the injection nozzle 21 is provided on the rear wall 23 of the reburning chamber 9 has been described. By injecting the flow rate adjusting gas AG from the most downstream part of the reburning chamber 9, it is possible to efficiently secure the residence time of the combustion gas BG, and without changing the structure of the conventional waste incinerator 1 greatly. It is preferable to provide the injection nozzle 21 on the rear wall 23 in that the injection nozzle 21 can be provided. However, for example, an injection nozzle 21 that injects the flow rate adjusting gas AG toward the upstream side may protrude from the lower side wall 25 of the recombustion chamber 9 .

Also, in both the first embodiment and the second embodiment, an example in which the injection nozzle 21 is directed in a direction parallel to the wall surface of the lower side wall 25 of the reburning chamber 9 has been described. However, the injection nozzle 21 may be directed toward the wall surface side of the lower side wall 25 . In this case as well, the flow rate adjusting gas AG injected onto the wall surface of the lower side wall 25 from the injection nozzle 21 flows upstream along this wall surface, and a swirling flow can be generated.

Also, in both the first embodiment and the second embodiment, examples of nozzles such as the injection nozzle 21 and the auxiliary injection nozzle 31, that is, cylindrical members, have been described as the injection section and the auxiliary injection section. By configuring in this way, the directivity of each gas to be injected is enhanced, so that the unburned components in the combustion gas can be burned more efficiently. However, the injection part and/or the auxiliary injection part are not limited to the form of a nozzle, and may be, for example, a simple opening formed in each wall.

As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, changes, or deletions can be made without departing from the scope of the present invention. Accordingly, such are also included within the scope of this invention.

1 Waste incinerator 5 Combustion chamber 7 Incinerator 9 Reburning chamber 21 Injection nozzle (injection part)
23 Rear wall of reburning chamber 25 Side wall of reburning chamber AG Flow control gas BG Combustion gas

Claims (8)

an incinerator for incinerating while transporting the waste in a substantially horizontal direction;
A recombustion chamber connected to the combustion chamber in which the incinerator is arranged and reburning the unburned components in the combustion gas generated in the combustion chamber, wherein from the downstream part of the combustion chamber, upward and the combustion chamber a reburning chamber extending in an inclined direction toward the upstream side of the
A flow rate adjusting gas , which is a gas for adjusting the imbalance of the flow rate distribution of the combustion gas in the reburning chamber, is injected in a direction along the side wall of the reburning chamber from the downstream portion to the upstream portion of the reburning chamber. an injection part;
with waste incinerator. 2. The waste incinerator according to claim 1, wherein said injection section is provided on a rear wall extending vertically upward from the most downstream portion of said reburning chamber. 3. The waste incinerator according to claim 2, wherein said injection section is configured to be capable of injecting flow rate adjusting gas along the lower side wall of said reburning chamber. 4. The waste incinerator according to claim 3, wherein the injection part is provided only in a lower portion of the rear wall corresponding to a low speed region, which is a region lower than the average flow velocity of the combustion gas flow in the reburning chamber. waste incinerator. an incinerator for incinerating while transporting the waste in a substantially horizontal direction;
A recombustion chamber connected to the combustion chamber in which the incinerator is arranged and reburning the unburned components in the combustion gas generated in the combustion chamber, wherein from the downstream part of the combustion chamber, upward and the combustion chamber a reburning chamber extending in an inclined direction toward the upstream side of the
an injection unit that injects a flow rate adjusting gas in a direction along a side wall of the recombustion chamber from a downstream portion to an upstream portion of the recombustion chamber;
with
The injection part is provided on a rear wall extending vertically upward from the most downstream part of the recombustion chamber,
The injection part is configured to be capable of injecting a flow rate adjusting gas along a lower side wall of the recombustion chamber,
A plurality of said injection parts are provided spaced apart in the height direction of said rear wall,
a flow velocity distribution measuring device for measuring the flow velocity distribution of the combustion gas flow in the reburning chamber;
a control device that selects an injection unit for injecting the flow rate adjusting gas based on the measurement result of the flow rate distribution measuring device;
A waste incinerator further comprising: an incinerator for incinerating while transporting the waste in a substantially horizontal direction;
A recombustion chamber connected to the combustion chamber in which the incinerator is arranged and reburning the unburned components in the combustion gas generated in the combustion chamber, wherein from the downstream part of the combustion chamber, upward and the combustion chamber a reburning chamber extending in an inclined direction toward the upstream side of the
an injection unit that injects a flow rate adjusting gas in a direction along a side wall of the recombustion chamber from a downstream portion to an upstream portion of the recombustion chamber;
with
The injection part is provided on a rear wall extending vertically upward from the most downstream part of the recombustion chamber,
The injection part is configured to be capable of injecting a flow rate adjusting gas along a lower side wall of the recombustion chamber,
The waste incinerator further comprising an auxiliary injection unit provided on the upstream front wall of the reburning chamber and injecting the flow rate auxiliary adjusting gas downstream along the upper side wall of the reburning chamber. 7. The waste incinerator according to claim 6, further comprising an adjusting device for adjusting the injection amount of the flow velocity adjusting gas according to the amount of waste to be incinerated by said incinerator. 8. Waste incinerator according to any one of claims 1 to 7, wherein the injection part and/or the auxiliary injection part is provided as a nozzle.

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