JP2019174059A - Waste incinerator - Google Patents

Abstract

To provide a waste incinerator capable of positively igniting unburned component in combustion gas by eliminating deviation of a flow rate of combustion gas at a recombustion chamber and assuring sufficient retention time.SOLUTION: A waste incinerator (1) comprises an incinerator (7) igniting waste (W) while transporting it in a substantial horizontal direction; and a recombustion chamber (9) connected to a combustion chamber (5) having the incinerator (7) arranged therein to re-ignite unburned component in combustion gas (BG) generated at the combustion chamber (5), the recombustion chamber (9) being extended from a downstream part of the combustion chamber (5) in a direction inclined toward an upstream side of the combustion chamber (5) and there is provided an injection part (21) for injecting flow velocity adjustment gas (AG) from the downstream side of the recombustion chamber (9) toward the upstream side in a direction along the side wall of the recombustion chamber (9).SELECTED DRAWING: Figure 1

Description

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

  Conventionally, as a waste incinerator, a stoker type incinerator having an incinerator for incineration while conveying waste by a plurality of arranged grate (stalker) is generally employed. Also, as a stoker-type incinerator, the so-called parallel flow system in which unburned components generated in the waste incineration process are flowed to the downstream side of the combustion chamber along the waste conveyance direction and then deflected upward. Is known (for example, see Patent Document 1).

  In a stoker-type incinerator, generally, air for secondary combustion is supplied to a combustion chamber in order to completely burn unburned components and reduce harmful substances such as NOx and dioxins. According to the parallel-flow type incinerator, the flow of combustion gas containing unburned components is forced to be deflected by the structure of the flow path, so that stirring and mixing of combustion gas and secondary combustion air are promoted. In addition, there is an advantage that unburned components can be combusted by introducing a smaller amount of secondary combustion air.

Japanese Patent Laying-Open No. 2015-090221

  On the other hand, in a parallel flow incinerator, by deflecting the combustion gas flow, in the recombustion chamber into which the combustion gas flow flows, there is a biased flow velocity distribution in which the flow velocity in the region outside the deflection portion is increased. Arise. As a result, in the recombustion chamber, there is a possibility that a sufficient residence time for burning the unburned components in the combustion gas cannot be secured.

  Accordingly, an object of the present invention is to solve the above-described problems by eliminating the unevenness of the flow rate of the combustion gas in the recombustion chamber and ensuring a sufficient residence time, thereby ensuring unburned components in the combustion gas. It is to provide a waste incinerator that can be combusted.

  In order to achieve the above-described object, a waste incinerator according to the present invention is connected to an incineration apparatus that incinerates waste while conveying the waste in a substantially horizontal direction, and a combustion chamber in which the incineration apparatus is disposed. A re-combustion chamber for recombusting unburned components in the combustion gas generated in the step, wherein the re-combustion chamber extends from a downstream portion of the combustion chamber upward and in an inclined direction toward the upstream side of the combustion chamber. A combustion chamber; and 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. The “flow velocity adjusting gas” in the present specification means a gas injected into the recombustion chamber for the purpose of adjusting the bias of the flow velocity distribution of the combustion gas in the recombustion chamber.

  According to this configuration, in the parallel flow incinerator that forcibly deflects the combustion gas, the flow rate adjustment gas is injected from the injection unit, thereby adjusting the deviation of the flow velocity distribution of the combustion gas in the recombustion chamber. be able to. Thereby, the residence time of the combustion gas in the recombustion chamber can be sufficiently ensured, and the unburned components in the combustion gas can be reliably burned.

  In an embodiment of the present invention, an injection unit 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 adjustment gas is injected from the most downstream portion of the recombustion chamber, the residence time of the combustion gas can be ensured efficiently. Further, the injection unit can be provided without greatly changing the structure of the conventional waste incinerator.

  In one Embodiment of this invention, the said injection part may be comprised so that injection of the flow rate adjustment gas is possible along the lower side wall of the said recombustion chamber. According to this configuration, the swirling flow can be generated in the recombustion chamber by injecting the flow rate adjusting gas into the lower region where the flow rate is reduced. Therefore, the residence time of the combustion gas can be effectively ensured while suppressing the injection amount of the flow rate adjusting gas by using the deflected flow of the combustion gas.

  In an embodiment of the present invention, an injection unit may be provided only in a lower part of the rear wall corresponding to a low speed region that is a region lower than the average flow velocity of the combustion gas flow in the recombustion chamber. When the range of the low-speed region in the recombustion chamber is constant and can be assumed, this configuration can effectively ensure the residence time of the combustion gas with a simple structure.

  In one embodiment of the present invention, a plurality of the injection units are provided apart from each other in the height direction of the rear wall, and a flow velocity distribution measuring device that measures a flow velocity distribution of a combustion gas flow in the recombustion chamber; The apparatus may further include a control device that selects an injection unit that injects the flow rate adjusting gas based on the measurement result of the flow velocity distribution measuring device. According to this configuration, it is possible to perform the optimum injection according to the flow velocity distribution in the recombustion chamber, and the residence time of the combustion gas can be effectively ensured with the necessary and sufficient gas injection amount.

  In an embodiment of the present invention, the auxiliary injection unit is provided on the upstream front wall of the recombustion chamber and injects the flow velocity auxiliary adjustment gas along the upper side wall of the recombustion chamber toward the downstream side. May be further provided. According to this configuration, the state of the swirling flow in the recombustion chamber is controlled by injecting the flow velocity auxiliary adjustment gas in the opposite direction to the flow velocity adjustment gas to the upper side of the recombustion chamber, which is a region where the flow velocity adjustment gas is not injected. It becomes easy. This makes it possible to efficiently secure a desired combustion gas residence time.

  In one embodiment of the present invention, it may further include an adjusting device that adjusts the injection amount of the flow velocity auxiliary adjusting gas according to the waste incineration amount of the incinerator. According to this configuration, the desired swirling flow can be maintained with a necessary and sufficient amount of gas by adjusting the injection amount of the flow velocity auxiliary adjustment gas according to the waste treatment load.

  In one Embodiment of this invention, the said injection part and / or an auxiliary injection part may be provided as a nozzle. According to this structure, since the directivity of each gas injected increases, the unburned component in the combustion gas can be burned more efficiently.

  As described above, according to the waste incinerator according to the present invention, unbalanced combustion gas flow rate in the recombustion chamber is eliminated, and sufficient residence time is ensured to ensure unburned components in the combustion gas. It becomes possible to burn.

It is a side view which shows the waste incinerator which concerns on 1st Embodiment of this invention. It is a side view which shows typically the schematic structure and effect | action of the waste incinerator of FIG. It is a front view which shows the example of the arrangement | positioning aspect of the injection nozzle of the waste incinerator of FIG. It is a front view which shows the other example of the arrangement | positioning aspect of the injection nozzle of the waste incinerator of FIG. It is a side view which shows schematic structure of the modification of the waste incinerator of FIG. It is a side view which shows the waste incinerator which concerns on 2nd Embodiment of this invention. It is a front view which shows the example of the arrangement | positioning aspect of the injection nozzle of the waste incinerator of FIG.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments.

  FIG. 1 shows a waste incinerator 1 according to the first embodiment of the present invention. In the waste incinerator 1, the waste W to be incinerated input from the inlet 3 is incinerated by the incinerator 7 installed in the combustion chamber 5, and the incinerator 7 incinerates the waste W. Unburned components contained in the generated combustion gas BG are recombusted in the recombustion chamber 9 connected to the downstream side of the combustion chamber 5. The high-temperature combustion gas combusted in the recombustion chamber 9 is used as a heat source of a heating device (not shown) such as a boiler connected further downstream of the recombustion 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 figure). Ash generated by incineration of the waste W in the incinerator 7 is discharged from the discharge chute 11.

  In the present specification, the “substantially horizontal direction” as the conveyance direction of the waste W includes not only the horizontal direction but also a direction including a horizontal direction component. Therefore, for example, the conveyance direction inclined in the vertical direction from the horizontal direction is also included in the “substantially horizontal direction”. Further, as will be described later, when the incinerator 7 is composed of a plurality of arranged stalkers, even if there is a place where the waste W moves vertically downward between adjacent stalkers, the entire incinerator 7 (That is, from the upstream end to the downstream end of the incinerator 7), the transport direction of the waste W is included in the “substantially horizontal direction” if it includes a horizontal component.

  Specifically, the incinerator 7 is configured as a stoker-type incinerator in which a plurality of grate (stalkers) are arranged side by side along the conveyance direction of the waste W. The incinerator 7 is divided into three blocks of a drying block 7a, a combustion block 7b, and a post-combustion block 7c in order from the upstream side. The waste W input from the inlet 3 in the drying block 7a is dried, the waste W dried in the combustion block 7b is combusted, and the waste W which has become unburned in the combustion block 7b in the post-combustion block 7c. Burn the remainder of the combustion. The primary air A <b> 1 is supplied to each block of the incinerator 7 from below.

  Since the recombustion 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 unburned components generated in the combustion chamber 5 BG flows in the combustion chamber 5 substantially in parallel with the conveyance direction of the waste W. The incinerator 1 is configured as a so-called parallel incinerator having such a structure.

  The upper part on the upstream side of the combustion chamber 5 is covered with an upper wall 13 that bulges upward. In the illustrated example, the upper wall 13 is inclined upward toward the downstream side. A recombustion chamber 9 is connected to a downstream portion of the combustion chamber 5, that is, an upper portion of a portion where the post-combustion block 7c is disposed. The recombustion 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. In the combustion chamber 5, an intermediate portion between the upper wall 13 and the lower side wall 25 of the recombustion chamber 9, that is, substantially above the combustion block 7 b, is recessed downward from the upper wall 13. An intermediate wall 15 connected to the lower side wall 25 is provided. An exhaust passage 17 for sending the high-temperature exhaust gas EG burned in the recombustion chamber 9 to the heating device extends substantially upward in the vertical direction from the downstream end of the recombustion chamber 9.

  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 in the horizontal direction and may be inclined downward toward the downstream side. Further, 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 a secondary air injection nozzle 19 that injects secondary air A2 to be mixed with the combustion gas BG in the combustion chamber 5.

  The waste incinerator 1 of the present embodiment has an injection nozzle 21 as an injection unit that injects the flow rate adjusting gas AG in a direction along the side wall of the recombustion chamber 9 from the downstream portion of the recombustion chamber 9 toward the upstream portion. Is provided.

  More specifically, the injection nozzle 21 is provided on the 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 recombustion chamber 9 is formed by an upstream end of a substantially vertical wall that faces 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 nozzle 21 is 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 directed in a direction parallel to the wall surface of the lower side wall 25 of the recombustion chamber 9.

  In the parallel flow type waste incinerator 1, as shown in FIG. 2, the combustion gas BG flow generated in the combustion chamber 5 is largely deflected at an angle of 90 ° or more when flowing into the recombustion chamber 9. This deflection promotes mixing of the combustion gas BG and the secondary air A2. However, this deflection causes a deviation in the flow velocity distribution in the height direction (direction perpendicular to the wall surface of the side wall 25 on the lower side of the recombustion chamber 9) H1 in the recombustion chamber 9. That is, a biased flow velocity distribution is generated in which the flow velocity in the upper region of the recombustion chamber 9 that is outside the deflection portion is increased (state A in the figure). In this case, a sufficient residence time cannot be obtained for the combustion gas BG passing through the upper region of the recombustion chamber 9. Therefore, in the present embodiment, in the recombustion chamber 9, the flow rate adjusting gas AG opposite to the flow direction of the combustion gas BG is injected into the lower region where the flow rate of the combustion gas BG decreases, and combustion in the upper region is performed. A swirl 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 a bias in the flow velocity distribution of the combustion gas BG in the cross section of the recombustion chamber 9 and to ensure a sufficient residence time of the combustion gas BG in the recombustion chamber 9. The flow rate of the flow rate adjusting gas AG injected from the injection nozzle 21 is set to be equal to or lower than the average flow rate of the combustion gas BG in the recombustion chamber 9. The flow rate of the flow rate adjusting gas AG is controlled by, for example, controlling the flow rate of the flow rate adjusting gas AG injected from the injection nozzle 21.

  Therefore, when the type and amount of the waste W to be incinerated are in a predetermined range, and a predetermined low speed region (for example, a region below the average flow velocity) where the flow rate adjusting gas AG should be injected in the recombustion chamber 9 can be specified. The injection nozzle 21 can be provided only in the lower part of the rear wall 23 corresponding to the low speed region in the recombustion chamber 9.

  In the present embodiment, as shown in FIG. 3, a plurality of (four in the illustrated example) injection nozzles 21 are arranged in the width direction of the rear wall 23 (that is, the recombustion chamber 9) in the substantially lower half region of the rear wall 23. Are arranged at equal intervals in the WI direction. But the number and arrangement | positioning of the injection nozzle 21 in the area | region which should provide the injection nozzle 21 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, the flow velocity adjusting gas is injected from the injection nozzle 21. The deviation of the flow velocity distribution of the combustion gas BG in the recombustion chamber 9 can be adjusted. Thereby, the residence time of the combustion gas BG in the recombustion chamber 9 can be sufficiently secured, and the unburned components in the combustion gas BG can be reliably burned. In particular, in the present embodiment, the injection nozzle 21 is provided only in the lower portion of the rear wall 23 corresponding to the low speed region that is a region lower than the average flow velocity of the combustion gas BG flow in the recombustion chamber 9. When the range of the low speed region in the recombustion chamber 9 is constant and can be assumed, such a configuration can effectively ensure 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 unit on the upstream front wall 27 of the recombustion chamber 9. The auxiliary injection nozzle 31 injects the flow velocity auxiliary adjustment gas SG along the upper side wall 33 of the recombustion chamber 9 toward the downstream side of the recombustion 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 waste incineration amount of the incineration device 7 may be further provided.

  By injecting the auxiliary flow velocity adjusting gas SG in the direction opposite to the flow velocity adjusting gas AG into the upper region of the recombustion chamber 9 where the auxiliary flow injection gas 31 is not injected, the flow velocity adjusting gas AG in the recombustion chamber 9. It becomes easy to control the state of the swirl flow S. In particular, when the incineration processing load of the incinerator 7 is lower than expected, the desired swirl flow S can be maintained by injecting the flow velocity auxiliary adjustment gas SG. Thereby, it becomes possible to ensure a desired residence time efficiently.

  As shown in FIG. 1, as a flow rate adjustment gas AG injected from the injection nozzle 21, a flow rate adjustment air supply passage 43 is provided by branching from a supply passage 41 of the secondary air A <b> 2, and the supply passage 41 of the secondary air A <b> 2 is provided. A part of the air is used. However, the supply system of the flow rate adjusting gas AG is not limited to this example, and the flow rate adjusting gas AG may be supplied from a supply source independent of the secondary air A2, for example. Further, the flow rate adjusting gas AG is not limited to air. For example, the exhaust gas EG discharged from the supply source independent of the secondary air A2 through the exhaust passage 17 may be used as the flow rate adjusting gas AG. The flow velocity auxiliary adjustment gas SG (FIG. 5) injected from the auxiliary injection nozzle 31 is not limited to the above example as with the flow velocity adjustment gas AG. For example, a part of the secondary air A2 or the exhaust gas EG is used. Can do.

  FIG. 6 shows a waste incinerator 1 according to the second embodiment of the present 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 recombustion chamber 9. The configuration for injecting the flow rate adjusting gas AG into the recombustion chamber 9 is the same as that of the first embodiment in that the injection nozzle 21 is provided on the rear wall 23 of the recombustion chamber 9, but it is necessary in advance. Rather than providing the injection nozzle 21 only at a predetermined position, a plurality of injection nozzles 21 are provided 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 different from the first embodiment in that it further includes a flow velocity distribution measuring device 45 that measures the flow rate and a control device 47 that selects the injection nozzle 21 that injects the flow velocity adjusting gas AG based on the measurement result of the flow velocity distribution measuring device 45. . Hereinafter, differences from the first embodiment will be mainly described, and descriptions of points that are common to the first embodiment will be omitted.

  As shown in FIG. 7, in this embodiment, a plurality (three in this example) of injection nozzles 21 are provided in the rear wall 23 of the recombustion chamber 9 so as to be spaced apart in the height direction H <b> 2 of the rear wall 23. ing. In the illustrated example, a plurality of (four in this example) injection nozzles 21 are spaced at equal intervals in the width direction of the rear wall 23 (width direction of the recombustion chamber 9) WI at the same position in the height direction H2. A plurality of injection nozzle rows 21R indicated by broken lines arranged in this way are provided in the height direction H2.

  As shown in FIG. 6, in the present embodiment, the recombustion chamber 9 is provided with a flow velocity distribution measuring device 45 that measures the flow velocity distribution in the height direction H <b> 1 of the recombustion chamber 9. As the flow velocity distribution measuring device 45, for example, an oxygen concentration meter can be used. Further, the waste incinerator 1 includes a control device 47 that selects the injection nozzle 21 that injects 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 recombustion chamber 9, and based on the measurement result, the control device 47 The flow rate adjusting gas AG is selectively injected from the injection nozzle 21 provided at a position corresponding to a predetermined low speed region (for example, a region below the average flow rate).

  When an oxygen concentration meter is used as the flow velocity distribution measuring device 45, a portion where the oxygen concentration is low is a combustion acceleration point and the gas flow velocity is fast, and conversely, a portion where the oxygen concentration is high is a combustion failure point and the gas flow velocity is slow. The flow velocity distribution is measured using this relationship.

  Further, the flow rate of the flow rate adjusting gas AG injected from each injection nozzle 21 may be controlled by using an oxygen concentration meter as the flow rate distribution measuring device 45 and other devices such as a flow rate meter and a carbon monoxide concentration meter in combination. it can.

  Hereinafter, an example of control in which three of the CO concentration meter, the temperature measuring device, and the oxygen concentration meter are linked will be described. These measuring devices are arranged, for example, at the outlet of the recombustion chamber 9. When the CO concentration measured by the CO densitometer is lower than a predetermined threshold, the current injection amount is maintained, and when the CO concentration is higher than the threshold, the flow control of each injection nozzle 21 is performed as follows. When the temperature in the recombustion chamber 9 measured by the temperature measuring device is equal to or lower than a predetermined temperature (for example, 850 ° C.) and the oxygen concentration is higher than a set value, the supply amount of the flow rate adjusting gas AG is decreased because the air is excessive. This promotes an increase in the temperature in the recombustion chamber 9. For the same reason (promoting an increase in the room temperature), even if the temperature in the recombustion chamber 9 is a predetermined temperature (for example, 850 ° C.) or lower and the oxygen concentration is lower than the set value, the gas supply amount is reduced. The process of increasing is not performed, and the supply amount is maintained as it is. When the temperature in the recombustion chamber 9 is equal to or higher than a predetermined temperature (for example, 850 ° C.) and the oxygen concentration is lower than the set value, the air is too low and the injection nozzle 21 is opened to increase the amount of air. When the oxygen concentration is higher than the set value, the current state is maintained and combustion is promoted.

  In the present embodiment, as in the modification shown in FIG. 5, the auxiliary injection nozzle 31 may be further provided on the front wall 27 on the upstream side of the recombustion chamber 9.

  According to the waste incinerator 1 according to the second embodiment described above, the flow velocity from the injection nozzle 21 in the parallel flow type waste incinerator 1 forcibly deflecting the combustion gas BG is the same as in the first embodiment. By injecting the adjustment gas AG, it is possible to adjust the deviation of the flow velocity distribution of the combustion gas BG in the recombustion chamber 9. Thereby, the deviation of the flow velocity distribution of the combustion gas BG in the cross section of the recombustion chamber 9 can be suppressed, and a sufficient residence time of the combustion gas BG in the recombustion chamber 9 can be secured. It becomes possible to reliably burn the unburned components therein. In particular, in the present embodiment, since the injection nozzle 21 for injecting the flow rate adjusting gas AG is selected based on the measurement result of the flow rate distribution measuring device 45, optimal injection according to the flow rate distribution in the recombustion chamber 9 is performed. Thus, the residence time of the combustion gas BG can be effectively ensured with a necessary and sufficient gas injection amount.

  In both the first embodiment and the second embodiment, as shown in FIG. 1 or FIG. 6, the flow velocity adjusting gas AG is injected through the injection nozzle 21 along the lower side wall 25 of the recombustion chamber 9. An example of a possible configuration has been described. As described above, this configuration is preferable in that the swirl flow S can be generated in the recombustion chamber 9. However, the injection nozzle 21 adjusts the flow rate along the upper side wall 33 of the recombustion chamber 9. Even if the gas AG can be injected, a certain effect of increasing the residence time of the combustion gas BG can be obtained.

  Further, in both the first embodiment and the second embodiment, the suppression of the deviation in the flow velocity distribution of the combustion gas BG causes the flow rate adjusting gas AG from the injection nozzle 21 to generate a swirling flow as described above. In addition to injection, in order to cancel the bias of the flow velocity distribution of the combustion gas BG, the injection amount of the flow adjustment gas AG is increased for the portion with the large flow velocity distribution, and the flow adjustment gas AG for the portion with the small flow velocity distribution. This may be done by configuring and controlling the injection amount of the gas.

  In both the first embodiment and the second embodiment, the example in which the injection nozzle 21 is provided on the rear wall 23 of the recombustion chamber 9 has been described. By injecting the flow rate adjusting gas AG from the most downstream part of the recombustion chamber 9, the residence time of the combustion gas BG can be efficiently secured, and without greatly changing the structure of the conventional waste incinerator 1. 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 from the lower side wall 25 of the recombustion chamber 9 toward the upstream side may be provided.

  In both the first embodiment and the second embodiment, the example in which the injection nozzle 21 is directed in the direction parallel to the wall surface of the lower side wall 25 of the recombustion chamber 9 has been described. But the injection nozzle 21 may be orient | assigned to the direction which inclines in the wall surface side of the lower side wall 25. FIG. Also in this case, the flow velocity adjusting gas AG injected from the injection nozzle 21 onto the wall surface of the lower side wall 25 flows upstream along the wall surface, and a swirling flow can be generated.

  Further, in both the first embodiment and the second embodiment, the example in which the nozzles such as the injection nozzle 21 and the auxiliary injection nozzle 31 are provided as the injection unit and the auxiliary injection unit, that is, the cylindrical member has been described. By configuring in this manner, the directivity of each gas to be injected is increased, so that unburned components in the combustion gas can be burned more efficiently. But the injection part and / or auxiliary injection part are not restricted to the form of a nozzle, for example, may be 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, modifications, or deletions can be made without departing from the spirit of the present invention. Therefore, such a thing is also included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Waste incinerator 5 Combustion chamber 7 Incinerator 9 Recombustion chamber 21 Injection nozzle (injection part)
23 Rear wall of recombustion chamber 25 Side wall of recombustion chamber AG Flow rate adjusting gas BG Combustion gas

Claims (8)

An incinerator that incinerates waste while transporting it almost horizontally,
A recombustion chamber that is connected to a combustion chamber in which the incinerator is disposed and recombusts unburned components in the combustion gas generated in the combustion chamber, from above the downstream portion of the combustion chamber, and above the combustion chamber A recombustion chamber extending in a direction inclined toward the upstream side of
An injection unit for injecting 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;
A waste incinerator. The waste incinerator according to claim 1, wherein an injection part is provided on a rear wall extending vertically upward from a most downstream part of the recombustion chamber. The waste incinerator according to claim 2, wherein the injection unit is configured to be able to inject a flow rate adjusting gas along a lower side wall of the recombustion chamber.   4. The waste incinerator according to claim 3, wherein an injection unit is provided only in a lower portion of the rear wall corresponding to a low speed region that is a region lower than an average flow velocity of a combustion gas flow in the recombustion chamber. Waste incinerator. In the waste incinerator according to claim 3,
A plurality of the injection portions are provided apart in the height direction of the rear wall;
A flow velocity distribution measuring device for measuring a flow velocity distribution of a combustion gas flow in the recombustion chamber;
Based on the measurement result of the flow velocity distribution measuring device, a control device that selects an injection unit for injecting the flow velocity adjusting gas;
A waste incinerator further equipped with. In the waste incinerator according to any one of claims 3 to 5,
A waste incinerator further provided with an auxiliary injection unit that is provided on an upstream front wall of the recombustion chamber and injects a flow rate auxiliary adjustment gas along the upper side wall of the recombustion chamber toward the downstream side.   The waste incinerator according to claim 6, further comprising an adjusting device that adjusts an injection amount of the flow velocity auxiliary adjusting gas according to a waste incineration amount of the incinerator.   The waste incinerator according to any one of claims 1 to 7, wherein the injection unit and / or the auxiliary injection unit are provided as nozzles.

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