JP6992194B2 - Stalker type incinerator and incinerator method - Google Patents

Description

The present disclosure relates to a stoker-type incinerator and a method for incinerating an incinerator.
This application claims priority based on Japanese Patent Application No. 2018-190390 filed in Japan on October 5, 2018, and this content is incorporated herein by reference.

The stoker-type incinerator is a combustion gas flow in which a stoker that transports incinerators such as waste, a furnace that covers the stoker, and a combustion gas flow path that guides the combustion gas generated by combustion of the incinerator upward are formed. It is equipped with a road frame. Inside the incinerator, a combustion chamber is formed in which the incinerated material burns. The combustion gas flow path frame is connected to the upper end of the furnace.

As such a stoker-type incinerator, for example, there are the facilities described in the following Patent Documents 1 to 3. In the equipment described in Patent Documents 1 to 3, the inside of the furnace is used as the primary combustion chamber in which the incinerated material is burned, and the downstream part in the combustion gas flow path is used as the secondary combustion chamber. Gas containing oxygen is supplied from the nozzle. In these facilities, the nozzle is fixed to the combustion gas flow path frame so that the main ejection direction of the gas from the nozzle is horizontal.

In these facilities, gas is ejected from the nozzle into the secondary combustion chamber to burn the unburned portion of the incinerator that could not be burned in the primary combustion chamber, increasing the combustion efficiency of the incinerator. There is.

Japanese Patent No. 3210859 Japanese Patent No. 5084581 Japanese Patent No. 5219468

Businesses that incinerate the incinerated material are requesting that the combustion efficiency of the incinerated material be further improved.

Therefore, it is an object of the present disclosure to provide a technique capable of increasing the combustion efficiency of the incinerated material.

One aspect of the stoker-type combustion equipment according to the present disclosure for achieving the above object is
A stoker that transports the incinerated material in a direction having a horizontal component, a furnace that covers the stoker and burns the incinerated material on the stoker, and combustion that guides the combustion gas generated by the combustion of the incinerated material upward. Combustion air that supplies combustion air to the combustion gas flow path frame formed by the gas flow path and connected to the furnace so as to be located above a part of the stoker and the incinerated object on the stoker. A supply unit, a mixing gas supply unit that sends at least one of a part of the combustion air and a part of the combustion gas as a mixing gas into the furnace or the combustion gas flow path. To prepare for. The mixing gas supply unit is a flow rate regulator that adjusts the flow rates of a plurality of nozzles that eject the mixing gas into the furnace or the combustion gas flow path, and the mixing gas ejected from the plurality of nozzles. And have. The opening area of the ejection port for ejecting the mixing gas in the nozzle is 7850 mm ² or more and 49060 mm ² or less. The flow rate controller adjusts the flow rate of the mixing gas so that the flow velocity of the mixing gas ejected from the plurality of nozzles is 20 m / s or more and 90 m / s or less. The plurality of nozzles of the combustion gas flow path allow the mixing gas to be directed to a position above the top of the flame or the top of the flame formed by the combustion of the incinerated material on the stoker. When the flame is provided side by side in the circumferential direction with respect to the flow path axis extending in the vertical direction and passing through the center of the horizontal cross section, and the flame is formed on the downstream side in the transport direction from the position where the flow path axis exists, the said The flame forming region is brought closer to the region including the position where the flow path axis exists.

In this embodiment, the mixing gas ejected from the nozzle can reach the top of the flame or a position above the top of the flame. Therefore, in this embodiment, the mixing ratio of the mixing gas into the combustion gas can be increased, and the combustion efficiency of the unburned portion contained in the combustion gas can be increased.

The combustion gas immediately after formation contains unburned components. In this embodiment, the mixing gas from the mixing gas nozzle can be supplied to a position above the top of the flame or the top of the flame, directing the mixing gas to a position above the top of the flame or the top of the flame. That is, in this embodiment, a mixing gas containing oxygen is supplied to the combustion gas immediately after production. Therefore, in this embodiment, the unburned component in the combustion gas can be combusted with oxygen contained in the mixing gas immediately after the combustion gas is generated. Moreover, in this embodiment, the mixed gas containing oxygen can be supplied over a wide range in the vertical direction. Therefore, in this embodiment, at least a part of the unburned portion in the combustion gas is burned immediately after the combustion gas is generated.

When the mixing gas is ejected from the mixing gas nozzle, the static pressure around the mixing gas is reduced, so that the top of the flame is attracted to the side of the ejected mixing gas. Therefore, in the above aspect, even when the flame is not formed in the most preferable region, the flame forming region can be brought closer to the most preferable region.

One aspect of the method for incinerating an incinerator according to the present disclosure for achieving the above object is.
A stoker that transports the incinerated material in a direction having a horizontal component, a furnace that covers the stoker and burns the incinerated material on the stoker, and combustion that guides the combustion gas generated by the combustion of the incinerated material upward. Combustion air that supplies combustion air to the combustion gas flow path frame formed by the gas flow path and connected to the furnace so as to be located above a part of the stoker and the incinerated object on the stoker. In a method of incinerating an incinerated object in a stoker-type incineration facility including a supply unit, at least one of a part of the combustion air and a part of the combustion gas is used as a mixing gas from a plurality of nozzles. The step of supplying the mixing gas to be sent into the furnace or the combustion gas flow path is executed. The opening area of the ejection port for ejecting the mixing gas in the plurality of nozzles is 7850 mm ² or more and 49060 mm ² or less. The plurality of nozzles of the combustion gas flow path allow the mixing gas to be directed to a position above the top of the flame or the top of the flame formed by the combustion of the incinerated material on the stoker. When the flame is provided side by side in the circumferential direction with respect to the flow path axis extending in the vertical direction and passing through the center of the horizontal cross section, and the flame is formed on the downstream side in the transport direction from the position where the flow path axis exists, the said The flame forming region is brought closer to the region including the position where the flow path axis exists. The mixing gas supply step includes a flow rate adjusting step of adjusting the flow rate of the mixing gas so that the flow velocity of the mixing gas ejected from the plurality of nozzles is 20 m / s or more and 90 m / s or less.

According to one aspect of the present disclosure, the combustion efficiency of the incinerated material can be increased.

It is a system diagram of the stoker type incinerator in the first embodiment of this disclosure. It is a front view of the gas nozzle for mixing in the 1st Embodiment of this disclosure. The graph obtained by CFD analysis shows the relationship between the distance in the main ejection direction from the mixing gas nozzle and the flow velocity in the main ejection direction of the mixing gas for each mixing gas nozzle having different inner diameters of the ejection ports. It is a graph. It is a graph obtained by CFD analysis, and is a graph which shows the relationship between the height from the upper surface of the stoker, and the dispersion of oxygen concentration, for each mixing gas nozzle which the inner diameter of a spout is different from each other. It is explanatory drawing which shows the dimension of each part of the combustion gas flow path frame defined as a condition at the time of CFD analysis. It is a graph obtained by CFD analysis and is a graph which shows the relationship between CO concentration and height. It is a graph obtained by CFD analysis, and is the graph which shows the relationship between the jet coverage rate and the outlet CO concentration. It is a system diagram of the stoker type incinerator in the second embodiment of this disclosure. It is explanatory drawing which shows the structure of the angle changing mechanism and the installation height changing mechanism in the 2nd Embodiment of this disclosure. It is a functional block diagram of the controller in the 2nd Embodiment of this disclosure. It is a flowchart which shows the operation of the mixing gas supply part in the 2nd Embodiment of this disclosure. It is a front view of the 1st modification of a mixing gas nozzle. It is a front view of the 2nd modification of a mixing gas nozzle. A third modification of the mixing gas nozzle is shown. The figure (A) is the front of the mixed gas nozzle. FIG. (B) is a sectional view taken along line BB in FIG. (A). It is explanatory drawing which shows the modification of the arrangement of a mixed gas nozzle.

Various embodiments and modifications of the stoker-type incinerator according to the present disclosure will be described with reference to the drawings.

"First embodiment of stoker type incinerator"
Hereinafter, the first embodiment of the stoker-type incinerator according to the present disclosure will be described with reference to FIGS. 1 to 7.

As shown in FIG. 1, the stoker-type incineration facility of the present embodiment utilizes the heat of the stoker-type incinerator 1 that burns the incinerated material M such as waste and the heat of the combustion gas Gc generated by the combustion of the incinerated material M. Exhaust heat recovery boiler 2 that generates steam, a temperature reducing tower 3 that lowers the temperature of the combustion gas Gc from the exhaust heat recovery boiler 2, a combustion gas processor (combustion gas processing unit) 4, and an exhaust gas flow path. A frame 5 and a chimney 6 for exhausting the exhaust gas Ge to the outside are provided.

The temperature reducing tower 3 has a tower main body in which a space through which combustion gas Gc flows is formed, and a cooling medium ejector that ejects a cooling medium such as water into the space in the tower main body. The combustion gas processing device (combustion gas processing unit) 4 is, for example, a dust collector, a denitration device, or the like. The exhaust gas flow path frame 5 connects the combustion gas processor 4 and the chimney 6. The combustion gas Gc that has passed through the combustion gas processor 4 passes through the exhaust gas flow path frame 5 as exhaust gas Ge, reaches the chimney 6, and is exhausted to the outside from the chimney 6.

The stoker type incinerator 1 includes a hopper 10, a stoker 11, a furnace 12, a combustion gas flow path frame 16, a primary combustion air supply unit 20, a secondary combustion air supply unit 25, and a mixing gas supply unit. A unit 30 is provided.

The hopper 10 is a frame for receiving the incinerator M from the outside. The stoker 11 receives the incinerator M from the hopper 10 and transports the incinerator M in the transport direction Dt having the horizontal Dh component. The incinerator 12 covers the stoker 11 and forms a primary combustion chamber 13 in which the incinerator M on the stoker 11 burns. The incinerator 12 is formed with an inlet 14 for receiving the incinerator M from the hopper 10 and an discharge port 15 for discharging the incineration residue such as ash remaining after the incinerator M is burned. The receiving port 14 is formed on one side of the furnace 12 in the transport direction Dt (hereinafter referred to as the upstream side Dtu in the transport direction). Further, the discharge port 15 is formed on the other side of the furnace 12 in the transport direction Dt (hereinafter, referred to as the downstream side Dtd in the transport direction). The combustion gas flow path frame 16 forms a combustion gas flow path 17 that guides the combustion gas Gc generated by the combustion of the incinerator M upward. The combustion gas flow path frame 16 is connected to the upper end of the furnace 12 so as to be located above a part of the stoker 11. The lower space in the combustion gas flow path frame 16 forms the secondary combustion chamber 18. The combustion gas Gc that has passed through the combustion gas flow path 17 is guided to the exhaust heat recovery boiler 2.

The primary combustion air supply unit 20 includes an air supply device 21 and a plurality of air boxes 22. The air supply device 21 includes a push-in blower that sucks in outside air and an air heater that heats the air from the push-in blower. The plurality of air boxes 22 are arranged in the transport direction Dt. Each of the plurality of air boxes 22 guides the air from the air supply device 21 as the primary combustion air Ga1 from below the stoker 11 to the incinerator M on the stoker 11.

The secondary combustion air supply unit 25 secondary combustion to a plurality of secondary combustion air nozzles 29 for ejecting the secondary combustion air Ga2 into the combustion gas flow path 17 and a plurality of secondary combustion air nozzles 29. It has a secondary combustion air line 26 for guiding the secondary combustion air Ga2, and a flow rate regulator 27 for adjusting the flow rate of the secondary combustion air Ga2 ejected from the plurality of secondary combustion air nozzles 29. The plurality of secondary combustion air nozzles 29 are attached to the combustion gas flow path frame 16 along the circumferential direction Dc with respect to the flow path axis Ap extending in the vertical direction Dv and passing through the center in the horizontal cross section of the combustion gas flow path 17. ing. The secondary combustion air line 26 has a first end 26a connected to the above-mentioned air supply device 21 and a second end 26b connected to a plurality of secondary combustion air nozzles 29. Therefore, the air from the air supply device 21 is sent to the secondary combustion air nozzle 29 as the secondary combustion air Ga2. The flow rate regulator 27 has a flow rate control valve 28 provided for each of the plurality of secondary combustion air nozzles 29. The flow rate control valve 28 is provided in the secondary combustion air line 26.

The mixing gas supply unit 30 sends at least one gas out of a part of the combustion air Ga and a part of the combustion gas Gc into the furnace 12 or the combustion gas flow path 17 as the mixing gas Gm. The mixing gas supply unit 30 includes a plurality of mixing gas nozzles 40 for ejecting the mixing gas Gm into the combustion gas flow path 17, and a mixing gas line 31 for guiding the mixing gas Gm to the plurality of mixing gas nozzles 40. , A flow rate regulator 32 for adjusting the flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40. The plurality of mixing gas nozzles 40 are attached to the combustion gas flow path frame 16 side by side in the circumferential direction Dc (direction having a horizontal component) with respect to the flow path axis Ap. The mixing gas line 31 has a first end 31a connected to a supply source of the mixing gas Gm and a second end 31b connected to a plurality of mixing gas nozzles 40. Specifically, the second end 31b of the mixing gas line 31 is at least one of the above-mentioned air supply device 21, the end of the Dtd on the downstream side in the transport direction of the furnace 12, and the exhaust gas flow path frame 5. It is connected. Therefore, the mixing gas nozzle 40 contains the fresh air from the air supply device 21, the combustion gas Gc in the furnace 12, and the exhaust gas Ge (also the combustion gas Gc) flowing in the exhaust gas flow path frame 5. Of these, at least one gas is sent as the mixing gas Gm. When the first end 31a of the mixing gas line 31 is connected to the exhaust gas flow path frame 5, in order to boost the pressure of the exhaust gas Ge flowing into the mixing gas line 31 from the inside of the exhaust gas flow path frame 5. A blower 34 is provided in the mixing gas line 31. The flow rate regulator 32 has a flow rate control valve 33 provided for each of the plurality of mixing gas nozzles 40. The flow rate control valve 33 is provided in the mixing gas line 31.

The installation height H of the plurality of mixing gas nozzles 40 from the upper surface of the stoker 11 is lower than the secondary combustion air nozzle 29, and is 1500 mm or more and 4000 mm or less from the upper surface of the stoker 11. The installation height H of the plurality of mixing gas nozzles 40 is preferably 2000 mm or more and 3500 mm or less from the upper surface of the stoker 11. Each of the plurality of mixing gas nozzles 40 is provided in the combustion gas flow path frame 16 so as to be able to reach the top Ft of the flame F formed by the combustion of the incinerator M on the stoker 11. Specifically, the mixing gas nozzle 40 has a direction in which the main ejection direction Dm of the mixing gas Gm from the mixing gas nozzle 40 has a downward component and a horizontal Dh component approaching the flow path axis Ap, or The combustion gas flow path frame 16 is provided so as to have a horizontal direction Dh approaching the flow path axis Ap. Here, the main ejection direction Dm is the direction in which the mixing gas Gm is ejected from the mixing gas nozzle 40 in the direction in which the mixing gas Gm has the largest ejection flow rate. The main ejection direction Dm is a direction having an angle α of 0 ° or more and 60 ° or less with respect to the horizontal direction Dh. The main ejection direction Dm is preferably a direction at an angle α of 30 ° to 50 ° with respect to the horizontal Dh. The main ejection direction Dm of the present embodiment is, for example, a direction at an angle α of 45 ° with respect to the horizontal direction Dh.

As shown in FIG. 2, each of the plurality of mixing gas nozzles 40 is formed with a gas flow path 41 through which the mixing gas Gm flows. The gas flow path 41 extends in the nozzle axis direction Dan along the nozzle axis An with the nozzle axis An as the center. The end of the nozzle axial direction Dan of the gas flow path 41 forms an ejection port 44 for ejecting the mixing gas Gm. The spout 44 is circular with the nozzle axis An as the center. In this embodiment, the above-mentioned main ejection direction Dm is the nozzle axis direction Dan.

The inner diameter of the spout 44 is 100 mm or more and 250 mm or less. The inner diameter of the spout 44 is preferably 125 mm or more and 200 mm or less. The inner diameter of the ejection port 44 of the present embodiment is, for example, 190 mm.

The opening area of the spout 44 is 7850 mm ^{2 (= 50 mm × 50 mm × 3.14) when the inner diameter of the spout 44 is 100 mm, and the opening area is 49060 mm 2 (} ≈125 mm × 125 mm × 3.14) when the inner diameter of the spout 44 is 250 mm. be. Further, the opening area is 12265 mm ² (≈62.5 mm × 62.5 mm × 3.14) when the inner diameter of the ejection port 44 is 125 mm, and the opening area 31400 mm ² (≈100 mm × 100 mm × 3.14) when the inner diameter of the ejection port 44 is 200 mm. ). Further, the opening area is 28338 mm ² (= 95 mm × 95 mm × 3.14) when the inner diameter of the ejection port 44 is 190 mm. Therefore, the opening area of the ejection port 44 is 7850 mm ² or more and 49060 mm ² or less. The opening area of the spout 44 is preferably 12265 mm ² or more and 31400 mm ² or less. The opening area of the ejection port 44 of the present embodiment is, for example, 28338 mm ² .

The inventor of the present application changes the inner diameter of the ejection port 44, and regarding the relationship between the distance in the main ejection direction Dm from the nozzle and the flow velocity in the main ejection direction Dm of the mixing gas Gm for each inner diameter, CFD ( Computational Fluid Dynamics) analysis was performed. This CFD analysis was performed under the following conditions using nitrogen gas as the combustion gas Gc and air as the mixing gas Gm.

Combustion gas (nitrogen gas) temperature: 800 ° C
Combustion gas (nitrogen gas) rising speed: 3.1 m / s
Mixing gas (air) temperature: 150 ° C
Flow velocity in the main ejection direction Dm immediately after injection of the mixing gas (air): 60 m / s

As a result of this CFD analysis, as shown in FIG. 3, when the inner diameter of the ejection port 44 is 85 mm, the flow velocity of the mixing gas Gm drops sharply from the distance of 0.7 m from the nozzle, and the flow velocity from the nozzle is reduced. At a position where the distance was less than 3 m, the flow velocity of the mixing gas Gm became 0 m / s. When the inner diameter of the ejection port 44 is 100 mm, the flow velocity of the mixing gas Gm drops sharply from around 0.9 m from the nozzle, and when the distance from the nozzle exceeds 4 m, the mixing gas Gm The flow velocity of was 0 m / s. When the inner diameter of the ejection port 44 is 140 mm, the flow velocity of the mixing gas Gm drops sharply from around 1.2 m from the nozzle, and when the distance from the nozzle exceeds 6 m, the mixing gas Gm The flow velocity of was 0 m / s. When the inner diameter of the ejection port 44 is 190 mm, the flow velocity of the mixing gas Gm drops sharply from around 1.9 m from the nozzle, and even if the distance from the nozzle exceeds 6 m, the mixing gas Gm The flow velocity was secured. As described above, when the inner diameter of the ejection port 44 is increased, the penetrating force of the mixing gas Gm with respect to the primary combustion air Ga1 and the combustion gas Gc, which are the updrafts, increases.

The width of the combustion gas flow path 17 of the present embodiment (the width from the edge of the Dtu on the upstream side in the transport direction to the edge of the Dtd on the downstream side in the transport direction) is approximately 4 m. Within this width, in order to mix the mixing gas Gm with the primary combustion air Ga1 and the combustion gas Gc, it is necessary that the flow velocity of the mixing gas Gm in the main ejection direction Dm remains at any place. .. Therefore, when a mixing gas nozzle 40 is provided at the edge of the Dtu on the upstream side in the transport direction of the combustion gas flow path frame 16 forming the combustion gas flow path 17, and the main ejection direction Dm thereof is set to the horizontal direction Dh, the mixing gas nozzle 40 is provided. The inner diameter of the mixing gas nozzle 40 is 100 mm or more so that the mixing gas Gm from the above reaches the edge of the Dtd on the downstream side in the transport direction of the combustion gas flow path frame 16. On the other hand, if the inner diameter of the mixing gas nozzle 40 is made too large under the condition that the ejection flow rates of each of the plurality of nozzles are the same and the total flow rate is constant, the flow rate per nozzle increases and the number of nozzles decreases, so that the number of nozzles decreases. The installation interval becomes large. Therefore, there is a concern that the primary combustion air Ga1 and the combustion gas Gc may slip between the nozzles. For example, when the nozzle diameter is 85 mm and the installation interval for each nozzle is 400 mm, when the nozzle diameter is 250 mm, the installation interval for each nozzle is expanded to about 4000 mm. In order to prevent the combustion gas from slipping through between the nozzles, it is necessary to set the installation interval for each nozzle within 4000 mm. Therefore, in the present embodiment, the inner diameter of the mixing gas nozzle 40 is set to 250 mm or less.

In the CFD analysis described above, the flow velocity in the main ejection direction Dm immediately after the injection of the mixing gas (air) is set to 60 m / s. However, this flow velocity may be 20 m / s or more and 90 m / s. It is known that the larger the nozzle diameter, the smaller the decrease in the flow velocity after ejection, and the ratio of the decrease in the flow velocity to the ejection distance is substantially inversely proportional to the nozzle diameter. In the present embodiment, since it is assumed that the nozzle diameter is expanded up to about 3 times the conventional nozzle diameter (for example, 85 mm), even if the ejection flow rate of the mixing gas Gm is lowered to about 20 m / s. It is possible to secure the mixing. On the other hand, if the ejection flow rate is increased, the penetrating force and mixing property of the mixing gas Gm are increased, but the nozzle pressure loss is increased, and the capacity of the fan has to be increased. Since the nozzle pressure loss is proportional to the square of the ejection flow velocity, the flow velocity is preferably 90 m / s or less in order to keep the fan capacity about twice as large as the conventional one.

That is, the conditions for ejecting the mixing gas in this embodiment are as follows.
Inner diameter of spout 44: 100 mm or more and 250 mm or less (Opening area of spout 44: 7850 mm ² or more and 49060 mm ² or less)
Flow velocity in the main ejection direction Dm immediately after injection of the mixing gas:
20m / s or more and 90m / s

Here, in the present embodiment, a case where the total flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 is kept constant even when the inner diameter of the ejection port 44 is changed will be described. For example, when the inner diameter of the spout 44 which is outside the target range of the present embodiment is 85 mm and when the inner diameter of the spout 44 which is within the target range of the present embodiment is 190 mm, the ejection flow rate of the mixing gas Gm And when the total flow rate is the same, the number of mixing gas nozzles having an inner diameter of 190 mm of the ejection port 44 is smaller than the number of mixing gas nozzles having an inner diameter of 85 mm of the ejection port 44. Therefore, the flow rate of the mixing gas Gm ejected from one mixing gas nozzle having an inner diameter of 190 mm of the ejection port 44 is the flow rate of the mixing gas Gm ejected from one mixing gas nozzle having an inner diameter of 85 mm of the ejection port 44. It will be more than the flow rate. Specifically, the flow rate of the mixing gas Gm ejected from one mixing gas nozzle having an inner diameter of 190 mm at the ejection port 44 is the mixing gas ejected from one mixing gas nozzle having an inner diameter of 85 mm at the ejection port 44. It is about 5 times the flow rate of Gm. Therefore, the mixing gas Gm ejected from the mixing gas nozzle having an inner diameter of 190 mm of the ejection port 44 is for primary combustion, which is an updraft, than the mixing gas Gm ejected from the mixing gas nozzle having an inner diameter of 85 mm of the ejection port 44. The penetrating force of the mixing gas Gm with respect to the air Ga1 and the combustion gas Gc is increased.

The incinerator M is supplied from the hopper 10 onto the stoker 11 in the incinerator 12. Moisture may be contained in the incinerator M. The incinerated material M is dried by the primary combustion air Ga1 at the portion of the Dtu on the upstream side in the transport direction on the stoker 11. When the incinerator M dries to some extent, the incinerator M is ignited and a flame F is formed. Combustion gas Gc is generated by the combustion of the incinerator M. The combustion gas Gc flows upward in the combustion gas flow path 17 and flows into the exhaust heat recovery boiler 2. In the exhaust heat recovery boiler 2, the water and the combustion gas Gc are exchanged for heat to heat the water and generate steam. The combustion gas Gc that has passed through the exhaust heat recovery boiler 2 passes through the heat reducing tower 3. The temperature of the combustion gas Gc is lowered in the process of passing through the temperature reducing tower 3. The combustion gas Gc that has passed through the temperature reducing tower 3 passes through the combustion gas processor 4. The combustion gas Gc is purified by being subjected to a dust removal treatment and / or a denitration treatment in the process of passing through the combustion gas treatment device 4. The combustion gas Gc that has passed through the combustion gas processor 4 is exhausted as exhaust gas Ge from the chimney 6 to the outside through the exhaust gas flow path frame 5.

The region where the flame F is formed is most preferably a region including the position where the flow path axis Ap exists in the transport direction Dt from the viewpoint of increasing the combustion efficiency of the incinerator M. However, if the incinerator M contains a large amount of water, it takes time to dry the incinerator M, and the flame F has a flow path axis Ap as shown by a two-dot chain line in FIG. It is formed on the Dtd on the downstream side in the transport direction from the position where it is carried. When the flame F is formed on the downstream side Dtd in the transport direction, the distance from the incinerator M immediately after being placed on the stoker 11 to the flame F which is a heat source for heating the incinerator M becomes long. Therefore, it takes more time to dry the incinerator M, and the flame F is formed on the Dtd on the downstream side in the transport direction.

In the present embodiment, when the flame F is formed in the most preferable region, the mixing gas Gm from most of the mixing gas nozzles 40 among the plurality of mixing gas nozzles 40 is supplied to the top Ft of the flame F. To. Further, in the present embodiment, when the flame F is not formed in the most preferable region, for example, even when the flame F is formed in the transport direction downstream Dtd from the position where the flow path axis Ap exists, the circumferential direction. Of the plurality of mixing gas nozzles 40 arranged in Dc, the mixing gas Gm from some of the mixing gas nozzles 40 is supplied to the top Ft of the flame F.

The combustion gas Gc immediately after generation contains an unburned component. In the present embodiment, as described above, the mixing gas Gm containing oxygen is supplied to the top Ft of the flame F from at least a part of the mixing gas nozzles 40 among the plurality of mixing gas nozzles 40. That is, in the present embodiment, the mixing gas Gm containing oxygen is supplied to the combustion gas Gc immediately after the generation. Therefore, in the present embodiment, the unburned component in the combustion gas Gc can be combusted by the oxygen contained in the mixing gas Gm immediately after the combustion gas Gc is generated. Therefore, in the present embodiment, at least a part of the unburned portion in the combustion gas Gc is burned immediately after the generation of the combustion gas Gc.

The inventor changed the inner diameter of the ejection port 44, and performed a CFD analysis on the dispersion of the oxygen concentration at each height from the upper surface of the stoker 11 for each inner diameter.

The dispersion of oxygen concentration (σ2) is based on the following definition.
σ2 = (xi-μ) 2) / n
xi: Oxygen concentration in each cell when the combustion gas flow path is divided into a plurality of cells μ: Average oxygen concentration in the cross section of the combustion gas flow path n: Number of cells

As shown in FIG. 4, regardless of whether the inner diameter of the ejection port 44 in the nozzle is 85 mm or the inner diameter of the ejection port 44 in the nozzle is 195 mm, the oxygen concentration increases as the height from the upper surface of the stoker 11 decreases. Dispersion becomes large. Specifically, when the inner diameter of the ejection port 44 is 85 mm, the oxygen concentration dispersion is about 0.004 at the position where the height from the upper surface of the stoker 11 is 6 m, and the height is 1 m from the upper surface of the stoker 11. Then, the dispersion of the oxygen concentration becomes larger than 0.008. Further, when the inner diameter of the ejection port 44 is 190 mm, the dispersion of oxygen concentration is smaller than 0.002 at a position where the height from the upper surface of the stoker 11 is 6 m, and the height from the upper surface of the stoker 11 is 1 m. Even at the position, the dispersion of oxygen concentration is less than 0.004.

By the above CFD analysis, it is possible to reduce the dispersion of the oxygen concentration over a wide range of the vertical Dv by increasing the inner diameter of the ejection port 44. That is, when the inner diameter of the ejection port 44 is increased, a high oxygen concentration can be maintained over a wide range of the vertical Dv. Therefore, by increasing the inner diameter of the ejection port 44, the mixing ratio of the combustion gas Gc and the mixing gas Gm can be increased, and the unburned content in the combustion gas Gc can be reduced. In the present embodiment, the inner diameter of the mixing gas nozzle 40 is set to 100 mm or more not only from the viewpoint of penetration force but also from the viewpoint of this dispersion.

The inventor further changes the inner diameter of the ejection port 44 to determine the CO concentration, which is an unburned component contained in the combustion gas Gc, and the height from the lower end of the combustion gas flow path frame 16 for each inner diameter. A CFD analysis was performed on the relationship. This CFD analysis was performed under the following conditions using nitrogen gas as the combustion gas Gc and air as the mixing gas Gm, as in the above-mentioned CFD analysis.

Combustion gas (nitrogen gas) temperature: 800 ° C
Combustion gas (nitrogen gas) rising speed: 3.1 m / s
Mixing gas (air) temperature: 150 ° C
Flow velocity in the main ejection direction Dm immediately after injection of the mixing gas (air): 60 m / s
When the inner diameter of the spout is 85 mm → Nozzle pitch: 0.4 m,
Number of nozzles: 20 on the front side + 20 on the rear side When the inner diameter of the spout is 100 mm → Nozzle pitch: 0.6 m,
Number of nozzles: 14 on the front side + 14 on the rear side When the inner diameter of the spout is 190 mm → Nozzle pitch: 2.0 m,
Number of nozzles: 4 on the front side + 4 on the rear side * The total flow rate of the mixing gas (air) is constant.

Further, as shown in FIG. 5, the front-rear width of the combustion gas flow path frame 16 is 4 m, the width of the combustion gas flow path frame 16 is 8.2 m, and the height of the combustion gas flow path frame 16 is 14 m.

As a result of this CFD analysis, as shown in FIG. 6, regardless of the inner diameter of the ejection port 44, as the height from the lower end of the combustion gas flow path frame 16 increases in the combustion gas flow path frame 16, the height from the lower end increases. The CO concentration gradually decreased. When the inner diameter of the ejection port 44 was 190 mm and the height from the lower end of the combustion gas flow path frame 16 was about 5 m or more, the CO concentration became almost 0 [vol ppm-dry]. Further, when the inner diameter of the ejection port 44 is 100 mm and the height from the lower end of the combustion gas flow path frame 16 is approximately 10 m or more, the CO concentration becomes almost 0 [vol ppm-dry]. On the other hand, when the inner diameter of the ejection port 44 was 85 mm, the CO concentration did not approach 0 [vol ppm-dry] even when the height from the lower end of the combustion gas flow path frame 16 was approximately 14 m or more.

Based on the results of this CFD analysis, the relationship between the jet coverage and the CO concentration at the outlet of the combustion gas flow path frame 16 was investigated. Here, the outlet of the combustion gas flow path frame 16 is set to the position of the upper end of the combustion gas flow path frame 16. The position of the upper end is 14 m from the lower end of the combustion gas flow path frame 16. Further, the jet coverage ratio is the ratio of the penetration distance of the jet to the front-rear width of the combustion gas flow path frame 16 as shown in the following equation. The penetration distance of the jet is the distance from the nozzle to the position where the flow velocity of the mixing gas Gm becomes 0 m / s.
Jet coverage = Jet penetration distance / Front-back width of combustion gas flow path frame x 100 [%]

Here, the front-rear width of the combustion gas flow path frame 16 is 4 m as described above. When the inner diameter of the jet outlet 44 is 85 mm, the penetration distance of the jet is about 3 m as described above with reference to FIG. When the inner diameter of the jet outlet 44 is 100 mm, the penetration distance of the jet is about 4 m. When the inner diameter of the jet outlet 44 is 190 mm, the penetration distance of the jet is 6 m or more. Therefore, here, when the inner diameter of the jet outlet 44 is 100 mm, the jet coverage rate is about 100% (= jet penetration distance (4 m) / front-rear width of the combustion gas flow path frame (4 m) × 100). ..

As shown in FIG. 7, when the jet coverage rate is about 100% or more, that is, when the inner diameter of the jet outlet 44 is 100 mm, the CO concentration at the outlet of the combustion gas flow path frame 16 is almost 0 [vol ppm-dry]. become. On the other hand, when the jet coverage is less than about 100%, the CO concentration at the outlet of the combustion gas flow path frame 16 does not become 0 [vol ppm-dry].

Therefore, as a result of this CFD analysis, it was found that when the inner diameter of the ejection port 44 is 100 mm or more, the CO concentration at the outlet of the combustion gas flow path frame 16 can be made almost 0 [vol ppm-dry].

After the mixing gas Gm is supplied to the combustion gas Gc, the secondary combustion air Ga2 is supplied in the process of rising in the combustion gas flow path 17. Therefore, even if an unburned component (for example, CO) remains in the combustion gas Gc after the mixing gas Gm is supplied, this unburned component can be burned by the secondary combustion air Ga2.

As described above, in the present embodiment, the region where oxygen supplied in the combustion gas Gc exists becomes longer in the vertical direction Dv, and the unburned portion can be efficiently burned. Therefore, in the present embodiment, the combustion efficiency of the incinerator M can be improved.

By the way, when the mixing gas Gm is ejected from the mixing gas nozzle 40, the static pressure around the mixing gas Gm decreases, so that the top Ft of the flame F is attracted to the side of the ejected mixing gas Gm. Be done. Therefore, in the present embodiment, when the flame F is not formed in the most preferable region, for example, the flame F (in FIG. 1 in FIG. 1) is located on the downstream side Dtd in the transport direction from the position where the flow path axis Ap exists in the transport direction Dt. Even when the two-dot chain line) is formed, the region where the flame F is formed can be brought closer to the most preferable region. Therefore, in the present embodiment, the combustion efficiency of the incinerator M can be improved from this viewpoint as well.

In the present embodiment, as described above, the formation region of the flame F can be brought closer to the most preferable region due to the attraction effect of the flame F by the mixing gas Gm. Therefore, in the CFD analysis, for example, even if the ejection flow rate of the mixing gas Gm from the mixing gas nozzle 40 is 50 m / s, the mixing gas Gm and the combustion gas Gc are the same as when the ejection flow rate is 60 m / s. It was confirmed that the mixing was performed well. Therefore, in the present embodiment, the formation region of the flame F can be brought closer to the most preferable region due to the attraction effect of the flame F by the mixing gas Gm. Therefore, the flow rate of the mixing gas Gm ejected from one mixing gas nozzle 40 can be suppressed.

The flow rate regulator 32 of the present embodiment has a flow rate control valve 33 provided for each of the plurality of mixing gas nozzles 40. Here, among the plurality of mixing gas nozzles 40, a plurality of mixing gas nozzles 40 arranged on the upstream side Dtu in the transport direction from the flow path axis Ap are designated as upstream nozzle groups, and are downstream in the transport direction from the flow path axis Ap. A plurality of mixing gas nozzles 40 arranged on the side Dtd are designated as a downstream nozzle group. In this case, the flow rate regulator collectively adjusts the flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 constituting the upstream nozzle group instead of the flow rate adjusting valve 33 for each of the plurality of mixing gas nozzles 40. It has a flow rate control valve for the upstream side group and a flow rate control valve for the downstream side group that collectively adjusts the flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 constituting the downstream side nozzle group. May be good. Further, when adjusting only the total flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40, the flow rate regulator uses the mixing gas Gm instead of the flow rate adjusting valve 33 for each of the plurality of mixing gas nozzles 40. You may have a blower installed at or near the supplier. In this case, the total flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 is adjusted by changing the rotation speed of the blower or the like.

"Second embodiment of stoker type incinerator"
Hereinafter, the second embodiment of the stoker-type incinerator according to the present disclosure will be described with reference to FIGS. 8 to 11.

The stoker-type incinerator of the present embodiment differs from the stoker-type incinerator of the first embodiment only in the configuration of the mixing gas supply unit. Therefore, in the following, the mixing gas supply unit 30a of the present embodiment will be mainly described.

As shown in FIG. 8, the mixing gas supply unit 30a of the present embodiment is also mixed with the plurality of mixing gas nozzles 40 and the plurality of mixing gas nozzles 40, similarly to the mixing gas supply unit 30 of the first embodiment. It has a mixing gas line 31 for guiding the gas Gm, and a flow rate regulator 32 for adjusting the flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40. The mixing gas supply unit 30a of the present embodiment further includes an information acquisition unit 50 for acquiring flame formation region information, an angle changing mechanism 60 for changing the main ejection direction Dm of the mixing gas Gm from the mixing gas nozzle 40, and an angle changing mechanism 60. It has an installation height changing mechanism 65 that changes the position of the mixing gas nozzle 40 in the vertical direction Dv, and a controller 70.

The flame forming region information acquired by the information acquisition unit 50 is information for grasping the forming region of the flame F formed by the combustion of the incinerator M on the stoker 11. The information acquisition unit 50 includes, for example, an infrared camera 51 that captures an image of the inside of the furnace 12 from above, or a moisture meter 52 that detects the amount of moisture contained in the incinerator M in the hopper 10. The infrared camera 51 can detect the temperature distribution within the imaging range. It can be said that the flame F is formed in the region where the temperature is high within the imaging range of the infrared camera 51. Therefore, the data obtained by the infrared camera 51 becomes the flame formation region information. Further, as the amount of water contained in the incinerator M in the hopper 10 increases, it takes longer to dry the incinerator portion, so that the flame F moves closer to the Dtd on the downstream side in the transport direction. Therefore, the water content of the incinerator M detected by the moisture meter 52 also becomes the flame forming region information. Here, an infrared camera 51 and a moisture meter 52 are illustrated as examples of the information acquisition unit 50, but the information acquisition unit 50 may be another instrument or the like as long as it can acquire flame formation region information.

As shown in FIG. 9, the angle changing mechanism 60 rotates the nozzle support 61 that supports the mixing gas nozzle 40, the support receiver 62 that rotatably supports the nozzle support 61, and the nozzle support 61. It has a rotation drive mechanism 63 and. The support receiver 62 rotatably supports the nozzle support 61 within an angle α of the main ejection direction Dm of the mixing gas nozzle 40 with respect to the horizontal direction Dh of at least 0 ° to 60 °. As described in the first embodiment, the mixing gas nozzle 40 is preferably arranged at a position of 1500 mm or more and 4000 mm or less from the upper surface of the stoker 11. The distance from the upper surface of the stoker 11 to the top Ft of the flame F is usually about 1.5 m to about 2 to 3 m. In this case, the vertical height from the nozzle to the top Ft of the flame F is in the range of 0 m to a maximum of about 2.5 m. Therefore, when the front-rear width of the combustion gas flow path frame 16 is 4 m, the nozzle angle α is set in the range of 0 ° to 60 ° as described above, so that the mixing gas Gm is transferred to the top Ft of the flame F. It will be possible to supply.

The installation height changing mechanism 65 includes a slide base 66 to which the support receiver 62 of the angle changing mechanism 60 is fixed, a moving mechanism 67 for moving the slide base 66 in the vertical direction Dv, and a sealing mechanism 68. The combustion gas flow path frame 16 is formed with an opening 19 so that the mixing gas Gm from the mixing gas nozzle 40 can be ejected into the combustion gas flow path frame 16. The sealing mechanism 68 seals the gap between the slide base 66 and the opening 19 as the slide base 66 moves in the vertical direction Dv.

The controller 70 controls the operation of the angle changing mechanism 60, the installation height changing mechanism 65, and the flow rate control valve 33 provided for each of the plurality of mixing gas nozzles 40. As shown in FIG. 10, the controller 70 operates the flame position estimation unit 71, the target flame position storage unit 72, the deviation amount calculation unit 73, the operation target determination unit 74, the operation amount calculation unit 75, and the operation amount calculation unit 75. It has a quantity output unit 76 and. The flame position estimation unit 71 determines the position of the flame F formation region in the furnace 12 based on the flame formation region information acquired by the information acquisition unit 50, that is, based on the data from the infrared camera 51 or the moisture meter 52. presume. When the data of the infrared camera 51 is used, the flame position estimation unit 71 estimates the position of the flame F forming region from the temperature distribution in the furnace 12 obtained from this data. Further, when the flame position estimation unit 71 uses the data of the moisture meter 52, the water content-positional relationship previously investigated between the water content contained in the incinerated object M in the hopper 10 and the position of the flame forming region. The position of the flame F forming region in the furnace 12 is estimated from the amount of water contained in the incinerated material M in the hopper 10 actually obtained by the moisture meter 52. The target flame position storage unit 72 stores the position of the most preferable flame F forming region in the furnace 12 as the target flame position. The deviation amount calculation unit 73 obtains the deviation direction of the estimated flame position estimated by the flame position estimation unit 71 and the deviation amount of the estimated flame position with reference to the target flame position. The operation target determination unit 74 determines which of the angle changing mechanism 60, the installation height changing mechanism 65, and the plurality of flow rate control valves 33 is to be operated based on the deviation direction and the deviation amount of the estimated flame position. decide. The operation amount calculation unit 75 obtains the operation amount of the operation target determined by the operation target determination unit 74 based on the deviation direction and the deviation amount of the estimated flame position. The operation amount output unit 76 outputs the operation amount obtained by the operation amount calculation unit 75 to the operation target determined by the operation target determination unit 74.

Next, the operation of the mixing gas supply unit 30a will be described according to the flowchart shown in FIG.

First, the information acquisition unit 50 acquires flame formation region information (S10: information acquisition step). Next, a control calculation step for the controller 70 to receive flame formation region information from the information acquisition unit 50 and control any of the angle changing mechanism 60, the installation height changing mechanism 65, and the plurality of flow rate control valves 33 ( S11) is executed.

In the control calculation step (S11), first, the flame position estimation unit 71 of the controller 70 is based on the flame formation region information acquired by the information acquisition unit 50, that is, based on the data from the infrared camera 51 or the moisture meter 52. Then, the position of the formation region of the flame F in the furnace 12 is estimated (S12: flame position estimation step). The flame position estimation unit 71 may estimate the position of the flame F forming region in the furnace 12 based only on the data from the infrared camera 51. That is, the information acquisition unit 50 may be only the infrared camera 51. The target flame position storage unit 72 stores the position of the most preferable flame F forming region in the furnace 12 as the target flame position. The deviation amount calculation unit 73 obtains the deviation direction of the estimated flame position estimated by the flame position estimation unit 71 and the deviation amount of the estimated flame position with reference to the target flame position (S13: deviation amount calculation step).

Next, the operation target determination unit 74 sets any of the angle changing mechanism 60, the installation height changing mechanism 65, and the plurality of flow rate control valves 33 as the operation target based on the deviation direction and the deviation amount of the estimated flame position. It is determined whether or not to be performed (S14: operation target determination step). For example, when the estimated flame position is displaced in the front-rear direction with respect to the target flame position, the operation target determination unit 74 is all of the plurality of flow rate control valves 33 or a part of the plurality of flow rate control valves 33. Is the operation target. Further, for example, when the estimated flame position is displaced in the vertical direction with respect to the target flame position, the operation target determination unit 74 sets the angle changing mechanism 60 or the installation height changing mechanism 65 as the operation target. The estimated flame position may be displaced in the front-back direction or the up-down direction with respect to the target flame position. In such a case, the operation target determination unit 74 may set all of the angle changing mechanism 60, the installation height changing mechanism 65, and the plurality of flow rate control valves 33 as operation targets.

Next, the operation amount calculation unit 75 obtains the operation amount of the operation target determined by the operation target determination unit 74 based on the deviation direction and the deviation amount of the estimated flame position (S15: operation amount calculation step). When the operation target determination unit 74 targets a plurality of flow rate control valves 33, the operation amount calculation unit 75 obtains the operation amount for each of the plurality of flow rate control valves 33. The operation amount output unit 76 outputs the operation amount obtained by the operation amount calculation unit 75 to the operation target determined by the operation target determination unit 74 (S16: operation amount output step). This completes the control calculation process (S11).

It is assumed that the operation amount calculation unit 75 outputs the operation amount to the angle changing mechanism 60. In this case, the angle changing mechanism 60 changes the main ejection direction Dm of the mixing gas nozzle 40 according to this operation amount (S17: angle changing step). Specifically, when the estimated flame position is displaced upward with respect to the target flame position, for example, the angle α of the main ejection direction Dm of the mixing gas nozzle 40 with respect to the horizontal direction Dh is reduced. Further, when the estimated flame position is deviated downward from the target flame position, for example, the angle α of the main ejection direction Dm of the mixing gas nozzle 40 with respect to the horizontal direction Dh is increased. When the distance from the mixing gas nozzle 40 corresponding to the flow control valve 33 to be operated to the estimated flame position is larger than the distance from the mixing gas nozzle 40 to the target flame position, the main ejection direction Dm of the mixing gas nozzle 40 The angle α with respect to the horizontal direction Dh of is reduced. By the above control, the mixing gas Gm ejected from the mixing gas nozzle 40 is directed toward the top Ft of the flame F, the attraction effect of the mixing gas Gm is enhanced, and the formation region of the flame F is formed in the first embodiment. It is possible to approach the most preferable area.

Further, it is assumed that the operation amount calculation unit 75 outputs the operation amount to the installation height changing mechanism 65. In this case, the installation height changing mechanism 65 changes the position of the vertical Dv of the mixing gas nozzle 40 according to this operation amount (S18: position changing step). Specifically, when the estimated flame position deviates upward from the target flame position, for example, the installation position of the mixing gas nozzle 40 is raised. Further, when the estimated flame position is deviated downward from the target flame position, for example, the installation position of the mixing gas nozzle 40 is lowered. Further, when the distance from the mixing gas nozzle 40 corresponding to the flow control valve 33 to be operated to the estimated flame position is larger than the distance from the mixing gas nozzle 40 to the target flame position, the installation position of the mixing gas nozzle 40 is raised. do. By the above control, the mixing gas Gm ejected from the mixing gas nozzle 40 is directed toward the top Ft of the flame F, the attraction effect of the mixing gas Gm is enhanced, and the formation region of the flame F is formed in the first embodiment. It is possible to approach the most preferable area.

Further, it is assumed that the operation amount calculation unit 75 outputs the operation amount to all or a part of the plurality of flow rate control valves 33. In this case, the flow rate of the mixing gas Gm ejected from the mixing gas nozzle 40 is adjusted for each of the plurality of mixing gas nozzles 40 (S19: flow rate adjusting step). Specifically, when the distance from the mixing gas nozzle 40 corresponding to the flow rate control valve 33 to be operated to the estimated flame position is larger than the distance from the mixing gas nozzle 40 to the target flame position, the flow rate control valve 33 to be operated Increases the flow rate of the mixing gas Gm ejected from the mixing gas nozzle 40. By this control, the flow velocity when the mixing gas Gm ejected from the mixing gas nozzle 40 reaches the top Ft of the flame F can be increased. Therefore, by this control, the attraction effect of the mixing gas Gm is enhanced, and the formation region of the flame F can be brought closer to the most preferable region than the first embodiment.

In the present embodiment, as described above, the angle changing mechanism 60, the installation height changing mechanism 65, and the flow rate regulator 32 operate based on the flame forming region information. However, at least one of the angle changing mechanism 60, the installation height changing mechanism 65, and the flow rate regulator 32 may operate based on the flame forming region information.

The flow rate regulator 32 of the present embodiment has a flow rate control valve 33 provided for each of the plurality of mixing gas nozzles 40, as in the first embodiment. Here, among the plurality of mixing gas nozzles 40, a plurality of mixing gas nozzles 40 arranged on the upstream side Dtu in the transport direction from the flow path axis Ap are designated as upstream nozzle groups, and are downstream in the transport direction from the flow path axis Ap. A plurality of mixing gas nozzles 40 arranged on the side Dtd are designated as a downstream nozzle group. In this case, the flow rate regulator collectively adjusts the flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 constituting the upstream nozzle group instead of the flow rate adjusting valve 33 for each of the plurality of mixing gas nozzles 40. It has a flow rate control valve for the upstream side group and a flow rate control valve for the downstream side group that collectively adjusts the flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 constituting the downstream side nozzle group. May be good.

The controller 70 may be composed of, for example, a computer having a CPU, a main storage device (for example, a memory), an external storage device (for example, a hard disk drive device), an input / output interface circuit, and the like. In this case, the external storage device stores a program for realizing each function of the controller 70 described above. Further, the target flame position is stored in this external storage device. Therefore, the target flame position storage unit 72 includes an external storage device. Further, the flame position estimation unit 71, the deviation amount calculation unit 73, the operation target determination unit 74, and the operation amount calculation unit 75 are a CPU that operates according to a program, and a main storage device in which the calculation process and calculation result of the CPU are developed. And is configured with. Further, the manipulated variable output unit 76 includes a CPU that operates according to a program, a main storage device in which the calculation process and calculation result of the CPU are developed, and an input / output interface circuit.

"Modification example of gas nozzle for mixing"
The ejection port 44 of the mixing gas nozzle 40 of each of the above embodiments is circular as described above with reference to FIG. However, the ejection port of the mixing gas nozzle does not have to be circular as shown in each modification of FIGS. 12 to 14.

First, a first modification of the mixing gas nozzle will be described with reference to FIG. 12. The ejection port 44a of the mixing gas nozzle 40a of this modification is rectangular. The long side of this rectangle extends in the vertical direction Dv, and the short side of this rectangle extends in the horizontal direction Dh. Therefore, the ejection port 44a has a wider opening width in the vertical direction Dv than an opening width in the horizontal direction Dh.

Next, a second modification of the mixing gas nozzle will be described with reference to FIG. The ejection port 44b of the mixing gas nozzle 40b of this modification has an elliptical shape. The long axis of this ellipse extends in the vertical direction Dv, and the short axis of this ellipse extends in the horizontal direction Dh. Therefore, the spout 44b has a wider opening width in the vertical direction Dv than the opening width in the horizontal direction Dh, as in the spout 44a of the first modification.

As in the above first and second modifications, when the opening width in the vertical direction Dv is wider than the opening width in the horizontal direction Dh, the combustion gas Gc which is an updraft becomes larger than the case where the ejection port 44 is circular. The area of the mixing gas Gm to be exposed becomes smaller. Therefore, in the mixing gas nozzles 40a and 40b of the first and second modifications, the penetrating force of the mixing gas Gm with respect to the combustion gas Gc which is the updraft is increased as compared with the mixing gas nozzle 40 of the above embodiment. Can be done.

The opening area of the ejection ports 44a and 44b in the mixing gas nozzles 40a and 40b of the first and second modifications may be substantially the same as the opening area of the ejection port 44 in the mixing gas nozzle 40 of the above embodiment. preferable. That is, the opening area of the spouts 44a and 44b in the mixing gas nozzles 40a and 40b of the first and second modifications is when the inner diameter of the spout 44 in the mixing gas nozzles 40 of the first and second embodiments is 100 mm. When the opening area is 7850 mm ² (= 50 mm × 50 mm × 3.14) or more and the inner diameter of the ejection port 44 in the mixing gas nozzle 40 of the first and second embodiments is 250 mm, the opening area is 49060 mm ² (≈125 mm × 125 mm × 3.14). The following is preferable. However, in the mixing gas nozzles 40a and 40b of the first and second modifications, as described above, the penetrating force of the mixing gas Gm can be increased as compared with the mixing gas nozzles 40 of the first and second embodiments. Therefore, the opening area of the ejection port 44 in the mixing gas nozzles 40a and 40b of the first and second modifications may be slightly smaller than the opening area exemplified above.

Next, a third modification of the mixing gas nozzle will be described with reference to FIG. When the total flow rate of the mixing gas Gm ejected from a plurality of mixing gas nozzles is made constant, if the opening area of the ejection port is increased, the distance between the two mixing gas nozzles adjacent to each other in the circumferential direction Dc becomes wider, and the mixing gas becomes wider. The amount of combustion gas Gc that rises without contacting Gm increases. This modification is an example of a nozzle capable of suppressing an increase in the amount of combustion gas Gc that rises without contacting the mixing gas Gm even if the opening area of the ejection port is increased.

A first gas flow path 42 and a second gas flow path 43 are formed in the mixing gas nozzle 40c of this modification. The first gas flow path 42 extends in the nozzle axis direction Dan with the nozzle axis An as the center. The end of the nozzle axial direction Dan in the first gas flow path 42 forms the first ejection port 45 for ejecting the mixing gas Gm. The second gas flow path 43 has an acute angle with respect to the nozzle axis An and extends in the axis inclination direction Ds having a horizontal Dh component. The angle β of the axis inclination direction Ds with respect to the nozzle axis An is, for example, 60 °. The end of the axis inclination direction Ds in the second gas flow path 43 forms the second ejection port 46 for ejecting the mixing gas Gm. The second spout 46 is formed at a position separated from the first spout 45 in the horizontal direction Dh.

Also in this modification, the nozzle axial direction Dan and the main ejection direction Dm coincide with each other. Therefore, the mixing gas Gm from the first gas flow path 42 is ejected in the direction including the main ejection direction Dm. On the other hand, the second gas flow path 43 extends in the axial direction Ds, and the second ejection port 46 is formed at a position separated from the first ejection port 45 in the horizontal direction Dh, so that the second gas flow path 43 is formed. The mixing gas Gm from the flow path 43 is ejected from a position separated in the horizontal direction Dh from a position separated in the horizontal direction Dh from the mixing gas Gm ejected from the first gas flow path 42. Therefore, in this modification, as described above, even if the total opening area of the ejection port is increased, the increase in the amount of combustion gas Gc that rises without contacting the mixing gas Gm can be suppressed.

It is preferable that the total opening area of the ejection port in the mixing gas nozzle 40c of the present modification is substantially the same as the opening area of the ejection port in the mixing gas nozzles of the above-described embodiment and the first and second modifications.

"Modification example of arrangement of gas nozzle for mixing"
A modified example of the arrangement of a plurality of mixing gas nozzles will be described with reference to FIG.

The mixing gas supply unit of this modification has a first nozzle group 40x composed of a plurality of mixing gas nozzles 40 and a second nozzle group 40y composed of a plurality of mixing gas nozzles 40. A plurality of mixing gas nozzles 40 constituting the first nozzle group 40x are arranged in the circumferential direction Dc. Further, the plurality of mixing gas nozzles 40 constituting the second nozzle group 40y are arranged in the circumferential direction Dc at positions above the plurality of mixing gas nozzles 40 constituting the first nozzle group 40x. Further, each of the plurality of mixing gas nozzles 40 constituting the second nozzle group 40y is one of the plurality of mixing gas nozzles 40 constituting the first nozzle group 40x, which are adjacent to each other in the circumferential direction Dc. It is located between 40. That is, in this modification, of all the mixing gas nozzles 40, the two mixing gas nozzles 40 adjacent to each other in the circumferential direction Dc have different positions in the vertical direction Dv.

Even if there is a combustion gas Gc that does not come into contact with the mixing gas Gm from the plurality of mixing gas nozzles 40 constituting the first nozzle group 40x, the combustion gas Gc contains a plurality of mixing gas Gc constituting the second nozzle group 40y. The mixing gas GM from the gas nozzle 40 can be brought into contact with the gas nozzle 40. Therefore, in this modification, even if the opening area of the ejection port is increased, the amount of the rising combustion gas Gc can be suppressed from increasing without coming into contact with the mixing gas Gm.

In this modification, the plurality of nozzles constituting the first nozzle group 40x and the plurality of nozzles constituting the second nozzle group 40y are all mixing gas nozzles 40. However, only the plurality of nozzles constituting the first nozzle group 40x may be the mixing gas nozzle 40, and the plurality of nozzles constituting the second nozzle group 40y may be the secondary combustion air nozzle 29.

"Other variants"
The stoker-type incineration facility of the above embodiment includes an exhaust heat recovery boiler 2, a temperature reducing tower 3, a combustion gas treatment device (combustion gas treatment unit) 4, an exhaust gas flow path frame 5, and a chimney 6. However, the stoker-type incineration facility may not be provided with any one of the exhaust heat recovery boiler 2, the heat reducing tower 3, the combustion gas processor 4, the exhaust gas flow path frame 5, and the chimney 6.

"Additional Notes"
The stoker type combustion equipment in the above embodiments and modifications is grasped as follows, for example.
(1) The stoker type combustion equipment in the first aspect is
It is generated by the combustion of the stoker 11 that conveys the incinerated object M in the direction having the horizontal component, the furnace 12 that covers the stoker 11 and the incinerated object M on the stoker 11 burns, and the incinerated object M. A combustion gas flow path 17 for guiding the combustion gas Gc upward is formed, and the combustion gas flow path frame 16 connected to the furnace 12 so as to be located above a part of the stoker 11 and the said on the stoker 11. At least one of the combustion air supply unit 20 that supplies the combustion air Ga1 to the incinerated object M, a part of the combustion air Ga1 and a part of the combustion gas Gc is used as the mixing gas Gm. The mixing gas supply units 30 and 30a to be sent into the furnace 12 or the combustion gas flow path 17 are provided. The mixing gas supply units 30, 30a have one or more nozzles 40, 40a, 40b, 40c for ejecting the mixing gas Gm into the furnace 12 or the combustion gas flow path 17. The opening area of the ejection ports 44, 44a, 44b for ejecting the mixing gas Gm in the nozzles 40, 40a, 40b, 40c is 7850 mm ² or more and 49060 mm ² or less.

In this embodiment, the mixing gas Gm ejected from the nozzles 40, 40a, 40b, 40c can be delivered to a position above the top Ft of the flame F or the top Ft of the flame F. Therefore, in this embodiment, the mixing ratio of the mixing gas Gm into the combustion gas Gc can be increased, and the combustion efficiency of the unburned portion contained in the combustion gas Gc can be increased.

(2) The stoker type combustion equipment in the second aspect is
In the stoker type combustion equipment according to the first aspect, the mixing gas supply units 30, 30a have a plurality of nozzles 40, 40a, 40b, 40c and eject from the plurality of nozzles 40, 40a, 40b, 40c. It has a flow rate regulator 32 that adjusts the flow rate of the mixing gas Gm. In this case, the flow rate regulator 32 uses the mixing gas Gm so that the flow velocity of the mixing gas Gm ejected from the plurality of nozzles 40, 40a, 40b, 40c is 20 m / s or more and 90 m / s or less. Adjust the flow rate of.

(3) The stoker type combustion equipment in the third aspect is
In the stoker type combustion equipment according to the second aspect, the plurality of nozzles 40, 40a, 40b, 40c are arranged in a direction having a horizontal component, and two adjacent nozzles 40, 40a, 40b, 40c are adjacent to each other in the direction having the horizontal component. The nozzles 40, 40a, 40b, and 40c have different positions in the vertical direction.

In this embodiment, the increase in the amount of the combustion gas Gc that rises without contacting the mixing gas Gm can be suppressed.

(4) The stoker type combustion equipment in the fourth aspect is
In the stoker type combustion equipment of the second aspect or the third aspect, the mixing gas supply units 30, 30a grasp the formation region of the flame F formed by the combustion of the incinerator M on the stoker 11. It has an information acquisition unit 50 for acquiring flame formation region information for the purpose of combustion. In this case, the flow rate regulator 32 adjusts the flow rate of the mixing gas Gm ejected from the plurality of nozzles 40, 40a, 40b, 40c based on the flame forming region information acquired by the information acquisition unit 50. do.

(5) The stoker type combustion equipment in another aspect is
It is generated by the combustion of the stoker 11 that conveys the incinerated object M in the direction having the horizontal component, the furnace 12 that covers the stoker 11 and the incinerated object M on the stoker 11 burns, and the incinerated object M. A combustion gas flow path 17 for guiding the combustion gas Gc upward is formed, and the combustion gas flow path frame 16 connected to the furnace 12 so as to be located above a part of the stoker 11 and the said on the stoker 11. At least one of the combustion air supply unit 20 that supplies the combustion air Ga1 to the incinerated object M, a part of the combustion air Ga1 and a part of the combustion gas Gc is used as the mixing gas Gm. The mixing gas supply units 30 and 30a to be sent into the furnace 12 or the combustion gas flow path 17 are provided. The mixing gas supply units 30, 30a include a plurality of nozzles 40, 40a, 40b, 40c for ejecting the mixing gas Gm into the furnace 12 or the combustion gas flow path 17, and the plurality of nozzles 40, To grasp the formation region of the flame F formed by the combustion of the incinerated object M on the stoker 11 and the flow rate regulator 32 that adjusts the flow rate of the mixing gas Gm ejected from the 40a, 40b, 40c. It has an information acquisition unit 50 for acquiring flame formation region information. The plurality of nozzles 40, 40a, 40b, 40c are arranged in a direction having a horizontal component. The flow rate regulator 32 adjusts the flow rate of the mixing gas Gm ejected from the plurality of nozzles 40, 40a, 40b, 40c based on the flame forming region information acquired by the information acquisition unit 50.

The region where the flame F is formed changes depending on the amount of water in the incinerator M. Further, when the mixing gas Gm is ejected from the mixing gas nozzles 40, 40a, 40b, 40c, the static pressure around the mixing gas Gm decreases, so that the flame F is the ejected mixing gas Gm. I'm drawn to my side. Therefore, if the flow rate of the mixing gas Gm ejected from the nozzles 40, 40a, 40b, 40c is increased to increase the flow velocity of the mixing gas Gm, the flame F attraction effect of the mixing gas Gm can be enhanced. can. Therefore, in this embodiment having the information acquisition unit 50, even if the flame F is not formed in the most preferable region, the formation region of the flame F can be brought closer to the most preferable region.

(6) The stoker type combustion equipment in the fifth aspect is
In the stoker type combustion equipment according to any one of the first aspect to the fourth aspect and the other aspect, the nozzles 40, 40a, 40b, 40c have the mixing gas Gm on the stoker 11. It is provided so as to be able to go toward the top Ft of the flame F formed by the combustion of the incinerator M.

(7) The stoker type combustion equipment in still another aspect is
It is generated by the combustion of the stoker 11 that conveys the incinerated object M in the direction having the horizontal component, the furnace 12 that covers the stoker 11 and the incinerated object M on the stoker 11 burns, and the incinerated object M. A combustion gas flow path 17 for guiding the combustion gas Gc upward is formed, and the combustion gas flow path frame 16 connected to the furnace 12 so as to be located above a part of the stoker 11 and the said on the stoker 11. At least one of the combustion air supply unit 20 that supplies the combustion air Ga1 to the incinerated object M, a part of the combustion air Ga1 and a part of the combustion gas Gc is used as the mixing gas Gm. The mixing gas supply units 30 and 30a to be sent into the furnace 12 or the combustion gas flow path 17 are provided. The mixing gas supply units 30, 30a have nozzles 40, 40a, 40b, 40c for ejecting the mixing gas Gm into the furnace 12 or the combustion gas flow path 17. The nozzles 40, 40a, 40b, 40c are provided so that the mixing gas Gm can be directed to the top Ft of the flame F formed by the combustion of the incinerator M on the stoker 11.

The combustion gas Gc immediately after generation contains an unburned component. In this embodiment, the mixing gas Gm is directed to the top Ft of the flame F, and the mixing gas Gm from the mixing gas nozzles 40, 40a, 40b, 40c can be supplied to the top Ft of the flame F. That is, in this embodiment, the mixing gas Gm containing oxygen is supplied to the combustion gas Gc immediately after the generation. Therefore, in this embodiment, the unburned component in the combustion gas Gc can be combusted by the oxygen contained in the mixing gas Gm immediately after the combustion gas Gc is generated. Moreover, in this embodiment, the mixed gas containing oxygen can be supplied over a wide range in the vertical direction. Therefore, in this embodiment, at least a part of the unburned portion in the combustion gas Gc is burned immediately after the generation of the combustion gas Gc.

(8) The stoker type combustion equipment in the sixth aspect is
In the stoker type combustion equipment of any one of the first aspect to the fifth aspect, the other aspect, and the still other aspect, the main mixing gas Gm from the nozzles 40, 40a, 40b, 40c. The direction in which the ejection direction Dm has a downward component and a horizontal component that passes through the center of the horizontal cross section of the combustion gas flow path 17 and approaches the flow path axis Ap extending in the vertical direction, or approaches the flow path axis Ap. The nozzles 40, 40a, 40b, 40c are provided so as to be in the horizontal direction.

(9) The stoker type combustion equipment in the seventh aspect is
In the stoker type combustion equipment of the sixth aspect, the main ejection direction Dm is a direction having an angle of 0 ° or more and 60 ° or less with respect to the horizontal direction.

(10) The stoker type combustion equipment in the eighth aspect is
In the stoker type combustion equipment of any one of the first aspect to the seventh aspect, the other aspect, and the further other aspect, the nozzles 40, 40a, 40b, 40c are the combustion gas flow path frame 16. It is provided in.

In this embodiment, the distance from the nozzles 40, 40a, 40b, 40c to the flame F can be shortened as compared with the case where the nozzles 40, 40a, 40b, 40c are provided in the furnace 12. Therefore, in this embodiment, the flow velocity of the mixing gas Gm when the mixing gas Gm reaches the flame F can be increased as compared with the case where the nozzles 40, 40a, 40b, and 40c are provided in the furnace 12. .. Therefore, in this embodiment, the mixing ratio of the mixing gas Gm into the combustion gas Gc can be increased, and the effect of attracting the flame F can be enhanced by the mixing gas Gm.

(11) The stoker type combustion equipment in the ninth aspect is
Combustion that processes the combustion gas Gc flowing through the combustion gas flow path 17 in any one of the first aspect to the eighth aspect, the other aspect, and the further other aspect. A gas processing unit 4 is provided. The combustion gas Gc that can be contained in the mixing gas Gm includes an exhaust gas that is the combustion gas Gc processed by the combustion gas processing unit 4.

(12) The stoker type combustion equipment in the tenth aspect is
In the stoker type combustion equipment according to any one of the first aspect to the ninth aspect, the other aspect, and the further other aspect, the nozzles 40, 40a, 40b, 40c are 1500 mm from the upper surface of the stoker 11. As mentioned above, it is installed at a position of 4000 mm or less.

(13) The stoker type combustion equipment in the eleventh aspect is
In the stoker type combustion equipment of any one of the first aspect to the tenth aspect, the other aspect, and the still other aspect, the mixing gas supply units 30, 30a are the nozzles 40, 40a, 40b. , 40c has an angle changing mechanism 60 for changing the main ejection direction Dm of the mixing gas Gm.

The region where the flame F is formed changes depending on the amount of water in the incinerator M. In this embodiment, even if the formation region of the flame F changes, the mixing gas Gm from the nozzles 40, 40a, 40b, 40c can be guided to the top Ft of the flame F by changing the main ejection direction Dm. Further, when the mixing gas Gm is ejected from the mixing gas nozzles 40, 40a, 40b, 40c, the static pressure around the mixing gas Gm decreases, so that the flame F is located near the ejected mixing gas Gm. Is attracted. Therefore, in this embodiment, even when the flame F is not formed in the most preferable region, the region where the flame F is formed can be brought closer to the most preferable region.

(14) The stoker type combustion equipment in the twelfth aspect is
In the stoker-type combustion equipment of the eleventh aspect, the mixing gas supply units 30, 30a are for grasping the formation region of the flame F formed by the combustion of the incinerator M on the stoker 11. It has an information acquisition unit 50 for acquiring formation region information. In this case, the angle changing mechanism 60 changes the main ejection direction Dm of the nozzles 40, 40a, 40b, 40c based on the flame forming region information acquired by the information acquisition unit 50.

(15) The stoker type combustion equipment in the thirteenth aspect is
In the stoker type combustion equipment of any one of the first aspect to the twelfth aspect, the other aspect, and the further other aspect, the mixing gas supply units 30, 30a are the nozzles 40, 40a. It has an installation height changing mechanism 65 that changes the positions of 40b and 40c in the vertical direction.

As described above, the formation region of the flame F changes depending on the amount of water in the incinerator M. In this embodiment, even if the formation region of the flame F changes, the mixing gas Gm from the nozzles 40, 40a, 40b, 40c can be transferred to the flame F by changing the positions of the nozzles 40, 40a, 40b, 40c in the vertical direction. It can lead to the top Ft. Further, when the mixing gas Gm is ejected from the mixing gas nozzles 40, 40a, 40b, 40c, the static pressure around the mixing gas Gm decreases, so that the flame F is located near the ejected mixing gas Gm. Is attracted. Therefore, in this embodiment, even when the flame F is not formed in the most preferable region, the region where the flame F is formed can be brought closer to the most preferable region.

(16) The stoker type combustion equipment in the fourteenth aspect is
In the stoker-type combustion equipment of the thirteenth aspect, the mixing gas supply units 30, 30a are for grasping the formation region of the flame F formed by the combustion of the incinerator M on the stoker 11. It has an information acquisition unit 50 for acquiring formation region information. In this case, the installation height changing mechanism 65 changes the positions of the nozzles 40, 40a, 40b, and 40c in the vertical direction based on the flame forming region information acquired by the information acquisition unit 50.

(17) The stoker type combustion equipment in the fifteenth aspect is
In the stoker type combustion equipment of any one of the first aspect to the fourteenth aspect, the other aspect, and the further other aspect, the first gas flow through which the mixing gas Gm flows through the nozzle 40c. A path 42 and a second gas flow path 43 are formed, and the first gas flow path 42 extends from the nozzle axis An of the nozzle 40c to the nozzle axis direction Dan along the nozzle axis An, and the nozzle axis line. The end of the direction Dan forms the first ejection port 45 for ejecting the mixing gas Gm. In this case, the second gas flow path 43 extends in the axis inclination direction Ds having an acute angle with respect to the nozzle axis An and having a horizontal component, and the end of the axis inclination direction Ds serves the mixing gas Gm. It forms the second spout 46 that spouts. The second spout 46 is formed at a position horizontally separated from the first spout 45.

In this embodiment, the increase in the amount of the combustion gas Gc that rises without contacting the mixing gas Gm can be suppressed.

(18) The stoker type combustion equipment in the sixteenth aspect is
In the stoker type combustion equipment of any one of the first aspect to the fourteenth aspect, the other aspect, and the further other aspect, the ejection port 44a for ejecting the mixing gas Gm of the nozzles 40a and 40b. , 44b has a wider opening width in the vertical direction than the opening width in the horizontal direction.

When the opening width in the vertical direction is wider than the opening width in the horizontal direction, the area of the mixing gas Gm exposed to the combustion gas Gc, which is an updraft, is smaller than that in the case where the spout is circular. Therefore, in this embodiment, the penetrating force of the mixing gas Gm with respect to the combustion gas Gc, which is an updraft, can be increased as compared with the case where the ejection port is circular.

(19) The stoker type combustion equipment in the seventeenth aspect is
In the stoker type combustion equipment of any one of the first aspect to the sixteenth aspect, the other aspect, and the further other aspect, the mixing gas supply units 30 and 30a eject the mixing gas Gm. The secondary combustion air supply unit 25 for supplying the secondary combustion air Ga2 into the combustion gas flow path 17 from a position higher than the position where the combustion gas is to be provided is provided.

In this embodiment, after the mixing gas Gm is supplied, the secondary combustion air Ga2 is supplied in the process of rising in the combustion gas flow path 17. Therefore, even if an unburned component remains in the combustion gas Gc after the mixing gas Gm is supplied, this unburned component can be burned by the secondary combustion air Ga2.

Further, the method of incinerating the incinerator M in the above embodiments and modifications is grasped as follows, for example.

(20) The method of incinerating the incinerator M in the eighteenth aspect is as follows.
It is a method of incinerating the incinerator M in the following stoker type combustion equipment.
This stoker-type combustion facility includes a stoker 11 that conveys the incinerator M in a direction having a horizontal component, a furnace 12 that covers the stoker 11 and burns the incinerator M on the stoker 11, and the incinerator. A combustion gas flow path 17 for guiding the combustion gas Gc generated by combustion of the object M upward is formed, and the combustion gas flow path frame 16 is connected to the incinerator 12 so as to be located above a part of the stoker 11. A combustion air supply unit 20 that supplies combustion air Ga1 to the incinerator M on the stoker 11 is provided.
In the method of incinerating the incinerated material M in this stoker-type combustion facility, a plurality of nozzles 40, using at least one gas of a part of the combustion air Ga1 and a part of the combustion gas Gc as a mixing gas Gm, The mixing gas supply step of sending from 40a, 40b, 40c into the furnace 12 or the combustion gas flow path 17 is executed. The opening areas of the ejection ports 44, 44a, 44b for ejecting the mixing gas Gm in the plurality of nozzles 40, 40a, 40b, 40c are 7850 mm ² or more and 49060 mm ² or less. In the mixing gas supply step, the flow rate of the mixing gas Gm is such that the flow velocity of the mixing gas Gm ejected from the plurality of nozzles 40, 40a, 40b, 40c is 20 m / s or more and 90 m / s or less. Includes a flow rate adjustment step to adjust.

(21) The method of incinerating the incinerator M in the nineteenth aspect is as follows.
In the method of incinerating the incinerator M of the eighteenth embodiment, the mixing gas supply step is a flame for grasping a region of flame F formed by combustion of the incinerator M on the stoker 11. It includes an information acquisition step of acquiring formation region information. In this case, in the flow rate adjusting step, the flow rate of the mixing gas Gm ejected from the plurality of nozzles 40, 40a, 40b, 40c is adjusted based on the flame forming region information.

(22) The method of incinerating the incinerator M in another aspect is as follows.
It is a method of incinerating the incinerator M in the following stoker type combustion equipment.
This stoker-type combustion facility includes a stoker 11 that conveys the incinerator M in a direction having a horizontal component, a furnace 12 that covers the stoker 11 and burns the incinerator M on the stoker 11, and the incinerator. A combustion gas flow path 17 for guiding the combustion gas Gc generated by combustion of the object M upward is formed, and the combustion gas flow path frame 16 is connected to the incinerator 12 so as to be located above a part of the stoker 11. A combustion air supply unit 20 that supplies combustion air Ga1 to the incinerator M on the stoker 11 is provided.
In the method of incinerating the incinerated material M in this stoker-type combustion facility, at least one of the part of the combustion air Ga1 and the part of the combustion gas Gc is used as the mixing gas Gm in the furnace 12 or in the furnace 12. The mixing gas supply step of sending into the combustion gas flow path 17 is executed. In the mixing gas supply step, the mixing gas Gm is mixed in the combustion gas flow path 17 so as to be directed toward the top Ft of the flame F formed by the combustion of the incinerator M on the stoker 11. Send gas Gm.

(23) The method of incinerating the incinerator M in the twenty-second aspect is as follows.
In the method for incinerating the incinerator M according to the eighteenth aspect or the other aspect, the mixing gas supply step forms a flame F forming region formed by combustion of the incinerator M on the stoker 11. It includes an information acquisition step of acquiring flame forming region information for grasping, and an angle changing step of changing the main ejection direction Dm of the mixing gas Gm based on the flame forming region information.

(24) The method of incinerating the incinerator M in the twenty-first aspect is as follows.
In the method for incinerating the incinerator M according to the eighteenth aspect or the other aspect, the mixing gas supply step forms a flame F forming region formed by combustion of the incinerator M on the stoker 11. It includes an information acquisition step of acquiring flame forming region information for grasping, and a position changing step of changing the vertical position of ejecting the mixing gas Gm based on the flame forming region information.

According to one aspect of the present disclosure, the combustion efficiency of the incinerated material can be increased.

1: Stoker type incinerator 2: Exhaust heat recovery boiler 3: Temperature reduction tower 4: Combustion gas processor (combustion gas treatment unit)
5: Exhaust gas flow path frame 6: Chimney 10: Hopper 11: Stoker 12: Fire furnace 13: Primary combustion chamber 14: Inlet 15: Discharge port 16: Combustion gas flow path frame 17: Combustion gas flow path 18: Secondary combustion Room 19: Opening 20: Primary combustion air supply unit 21: Air supply device 22: Air box 25: Secondary combustion air supply unit 26: Secondary combustion air line 27: Flow control device 28: Flow control valve 29: Secondary combustion air nozzles 30, 30a: Mixing gas supply unit 31: Mixing gas line 32: Flow controller 33: Flow control valve 34: Blowers 40, 40a, 40b, 40c: Mixing gas nozzle (or simply nozzle) )
40x: first nozzle group 40y: second nozzle group 41: gas flow path 42: first gas flow path 43: second gas flow path 44, 44a, 44b: ejection port 45: first ejection port 46: second injection Exit 50: Information acquisition unit 51: Infrared camera 52: Moisture meter 60: Angle change mechanism 61: Nozzle support 62: Support receiver 63: Rotation drive mechanism 65: Installation height change mechanism 66: Slide base 67: Movement mechanism 68 : Seal mechanism 70: Controller 71: Flame position estimation unit 72: Target flame position storage unit 73: Deviation amount calculation unit 74: Operation target determination unit 75: Operation amount calculation unit 76: Operation amount output unit Ga1: Primary combustion air Ga2: Secondary combustion air Gm: Mixing gas Gc: Combustion gas Ge: Exhaust gas F: Flame Ft: Top M: Incinerator Ap: Flow path axis An: Nozzle axis Dt: Transfer direction Dtu: Transfer direction upstream side Dtd: Transport direction downstream side Dc: Circumferential direction Dv: Vertical direction Dh: Horizontal direction Dan: Nozzle axis direction Dm: Main ejection direction Ds: Axis line tilt direction H: Installation height

Claims (19)

A stoker that transports the incinerator in a direction that has a horizontal component,
A furnace that covers the stoker and burns the incinerator on the stoker.
A combustion gas flow path frame that is connected to the furnace so that a combustion gas flow path that guides the combustion gas generated by combustion of the incinerator upward is formed and is located above a part of the stoker, and a combustion gas flow path frame.
A combustion air supply unit that supplies combustion air to the incinerator on the stoker,
A mixing gas supply unit for sending at least one gas out of a part of the combustion air and a part of the combustion gas as a mixing gas into the furnace or the combustion gas flow path is provided.
The mixing gas supply unit is a flow rate regulator that adjusts the flow rates of a plurality of nozzles that eject the mixing gas into the furnace or the combustion gas flow path, and the mixing gas ejected from the plurality of nozzles. And have
The opening area of the ejection port for ejecting the mixing gas in the nozzle is 7850 mm ² or more and 49060 mm ² or less.
The flow rate controller adjusts the flow rate of the mixing gas so that the flow velocity of the mixing gas ejected from the plurality of nozzles is 20 m / s or more and 90 m / s or less.
The plurality of nozzles of the combustion gas flow path allow the mixing gas to be directed to a position above the top of the flame or the top of the flame formed by the combustion of the incinerated material on the stoker. When the flame is provided side by side in the circumferential direction with respect to the flow path axis extending in the vertical direction and passing through the center of the horizontal cross section, and the flame is formed on the downstream side in the transport direction from the position where the flow path axis exists, the said Bring the flame formation region closer to the region containing the position where the flow path axis exists.
Stalker type incinerator. In the stoker-type incinerator according to claim 1 ,
The plurality of nozzles are arranged in a direction having a horizontal component.
Two nozzles adjacent to each other in the direction having the horizontal component have different positions in the vertical direction.
Stalker type incinerator. In the stoker type incinerator according to claim 1 or 2 .
The mixing gas supply unit has an information acquisition unit for acquiring flame formation region information for grasping a flame formation region formed by combustion of the incinerator on the stoker.
The flow rate regulator adjusts the flow rate of the mixing gas ejected from the plurality of nozzles based on the flame forming region information acquired by the information acquisition unit.
Stalker type incinerator. In the stoker-type incinerator according to any one of claims 1 to 3 ,
The direction in which the main ejection direction of the mixing gas from the nozzle has a downward component and a horizontal component that passes through the center of the horizontal cross section of the combustion gas flow path and approaches the flow path axis extending in the vertical direction, or The nozzle is provided so as to be in the horizontal direction approaching the flow path axis.
Stalker type incinerator. In the stoker-type incinerator according to claim 4 ,
The main ejection direction is a direction having an angle of 0 ° or more and 60 ° or less with respect to the horizontal direction.
Stalker type incinerator. In the stoker-type incinerator according to any one of claims 1 to 5 ,
The nozzle is provided in the combustion gas flow path frame.
Stalker type incinerator. In the stoker type incinerator according to any one of claims 1 to 6 .
A combustion gas processing unit for processing the combustion gas flowing through the combustion gas flow path is provided.
The combustion gas that can be contained in the mixing gas includes exhaust gas that is the combustion gas processed by the combustion gas processing unit.
Stalker type incinerator. In the stoker type incinerator according to any one of claims 1 to 7 .
The nozzle is installed at a position of 1500 mm or more and 4000 mm or less from the upper surface of the stoker.
Stalker type incinerator. In the stoker type incinerator according to any one of claims 1 to 8 .
The mixing gas supply unit has an angle changing mechanism for changing the main ejection direction of the mixing gas from the nozzle.
Stalker type incinerator. In the stoker type incinerator according to claim 9 .
The mixing gas supply unit has an information acquisition unit for acquiring flame formation region information for grasping a flame formation region formed by combustion of the incinerator on the stoker.
The angle changing mechanism changes the main ejection direction of the nozzle based on the flame forming region information acquired by the information acquisition unit.
Stalker type incinerator. In the stoker type incinerator according to any one of claims 1 to 10 .
The mixing gas supply unit has an installation height changing mechanism that changes the position of the nozzle in the vertical direction.
Stalker type incinerator. In the stoker type incinerator according to claim 11 .
The mixing gas supply unit has an information acquisition unit for acquiring flame formation region information for grasping a flame formation region formed by combustion of the incinerator on the stoker.
The installation height changing mechanism changes the position of the nozzle in the vertical direction based on the flame forming region information acquired by the information acquisition unit.
Stalker type incinerator. In the stoker-type incinerator according to any one of claims 1 to 12 ,
A first gas flow path and a second gas flow path through which the mixing gas flows are formed in the nozzle.
The first gas flow path extends in the nozzle axis direction along the nozzle axis with the nozzle axis of the nozzle as the center, and the end in the nozzle axis direction forms a first ejection port for ejecting the mixing gas. ,
The second gas flow path forms an acute angle with respect to the nozzle axis and extends in an axis inclined direction having a horizontal component, and the end in the axis inclined direction forms a second ejection port for ejecting the mixing gas. death,
The second spout is formed at a position horizontally separated from the first spout.
Stalker type incinerator. In the stoker-type incinerator according to any one of claims 1 to 12 ,
The ejection port for ejecting the mixing gas of the nozzle has a wider opening width in the vertical direction than an opening width in the horizontal direction.
Stalker type incinerator. In the stoker-type incinerator according to any one of claims 1 to 14 ,
A secondary combustion air supply unit for supplying secondary combustion air into the combustion gas flow path from a position higher than the position where the mixing gas supply unit ejects the mixing gas is provided.
Stalker type incinerator. A stoker that transports the incinerator in a direction that has a horizontal component,
A furnace that covers the stoker and burns the incinerator on the stoker.
A combustion gas flow path frame that is connected to the furnace so that a combustion gas flow path that guides the combustion gas generated by combustion of the incinerator upward is formed and is located above a part of the stoker, and a combustion gas flow path frame.
A combustion air supply unit that supplies combustion air to the incinerator on the stoker,
In the method of incinerating the incinerator in the stoker type incinerator equipped with
Execution of a mixing gas supply step in which at least one gas out of a part of the combustion air and a part of the combustion gas is sent as a mixing gas from a plurality of nozzles into the furnace or the combustion gas flow path. death,
The opening area of the ejection port for ejecting the mixing gas in the plurality of nozzles is 7850 mm ² or more and 49060 mm ² or less.
The plurality of nozzles of the combustion gas flow path allow the mixing gas to be directed to a position above the top of the flame or the top of the flame formed by the combustion of the incinerated material on the stoker. When the flame is provided side by side in the circumferential direction with respect to the flow path axis extending in the vertical direction and passing through the center of the horizontal cross section, and the flame is formed on the downstream side in the transport direction from the position where the flow path axis exists, the said Bring the flame formation region closer to the region containing the position where the flow path axis exists.
The mixing gas supply step includes a flow rate adjusting step of adjusting the flow rate of the mixing gas so that the flow velocity of the mixing gas ejected from the plurality of nozzles is 20 m / s or more and 90 m / s or less.
How to incinerate the incinerator. In the method for incinerating an incinerator according to claim 16 .
The mixing gas supply step includes an information acquisition step of acquiring flame forming region information for grasping a flame forming region formed by combustion of the incinerator on the stoker.
In the flow rate adjusting step, the flow rate of the mixing gas ejected from the plurality of nozzles is adjusted based on the flame forming region information.
How to incinerate the incinerator. In the method for incinerating an incinerator according to claim 16 .
The mixing gas supply step is
An information acquisition step for acquiring flame forming region information for grasping a flame forming region formed by combustion of the incinerator on the stoker, and
An angle changing step of changing the main ejection direction of the mixing gas based on the flame forming region information, and
including,
How to incinerate the incinerator. In the method for incinerating an incinerator according to claim 16 .
The mixing gas supply step is
An information acquisition step for acquiring flame forming region information for grasping a flame forming region formed by combustion of the incinerator on the stoker, and
A position changing step of changing the vertical position of ejecting the mixing gas based on the flame forming region information, and
including,
How to incinerate the incinerator.

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