JP6511267B2 - Fluidized bed incinerator - Google Patents

Description

  The present invention relates to a fluidized bed incinerator.

  Conventionally, in an incineration system for incinerating waste, for example, a fluidized bed incinerator is used. For example, as shown in Patent Document 1, a fluidized bed incinerator has a drying / thermal decomposition chamber and a combustion chamber. The drying and thermal decomposition chamber and the combustion chamber are provided with fluidized beds which are continuous below each other and in which a fluidizing medium flows. In the drying and thermal decomposition chamber, a drying gas is sprayed from the hearth to heat and dry the waste while mixing it with the fluid medium to pyrolyze it. In the combustion chamber, combustion gas is injected from the hearth, and the dried and pyrolyzed waste is burned while being mixed with the fluid medium. The gas generated by the thermal decomposition of the waste in the drying and thermal decomposition chamber is, for example, discharged from the incinerator and heat is recovered by the power generator. The combustion gas generated by the combustion of waste in the combustion chamber is discharged from the incinerator, for example, as an exhaust gas.

JP, 2006-275442, A

  In the fluidized bed incinerator described above, since the drying gas and the combustion gas are injected into the fluidized bed from below the hearth, the combustion gas flows into the drying and thermal decomposition chamber and the waste is burned There is. In addition, the drying gas may flow into the combustion chamber to deteriorate the combustion state. Moreover, in a fluidized bed combustion furnace, it may be desirable to separately recover or discharge the gas in each chamber.

  Therefore, an object of the present invention is to make it possible to appropriately prevent the mixing of the gas in each chamber in the incinerator in the fluidized bed incinerator.

  In order to solve the above-mentioned subject, the fluidized bed incinerator concerning one mode of the present invention is continuous with the 1st room filled with the 1st gas by the gas injected from the 1st hearth, and the 1st furnace bed. A second chamber filled with a second gas by a gas injected from a second hearth, a partition wall partitioning the inside of the furnace into the first chamber and the second chamber, and the partition wall below the partition wall A third gas flow system including: a first hearth floor and a fluid bed provided continuously on the second hearth floor and in which a fluid medium flows; and in the partition wall, a third gas flows inside. A passage is provided, and a jet port for jetting a third gas is formed in the fluidized bed.

  According to the above configuration, the third gas flowing through the third gas flow passage is spouted from the spout provided in the partition wall in the fluidized bed, and the first chamber and the first chamber are moved by the spout of the third gas. Mixing of the first gas and the second gas between the second chambers is prevented. Thus, the first gas and the second gas can be separated and mixing of these gases can be prevented in the fluidized bed without providing a large-scale device or structure in the incinerator.

  The partition wall may be provided to extend in the vertical direction from a ceiling in the furnace, and the jet may be provided at least at the lower end of the partition wall.

  Thus, by providing the partition wall in the vertical direction extending from the ceiling in the furnace, the first gas filled in the first chamber and the second gas filled in the second chamber are mixed above the fluidized bed This can be prevented by the partition wall. Moreover, in the fluidized bed, it is possible to prevent the first gas and the second gas from being mixed in the vicinity of the jet nozzle by the third gas jetted from the jet nozzle provided at the lower end of the partition wall.

  The jet nozzle may be provided to jet the third gas in the vertical direction.

  Thereby, in the incinerator, the first gas and the second gas can be separated by the partition wall above the lower end of the partition wall, and the third gas ejected in the vertical direction below the lower end of the partition wall And affecting the respective flows of the first gas and the second gas in the fluidized bed so that the first gas and the second gas can be separated.

  The jet port may be provided to jet a third gas toward the second hearth.

  Thereby, in the fluidized bed, particularly, the second gas in the second chamber can be easily separated from the vicinity of the gap between the partition wall and the fluidized bed.

  The jet nozzle may be provided to jet a third gas laterally from the inside of the fluidized bed on the second chamber side.

  Thus, the second gas in the second chamber can be easily separated from the vicinity of the partition wall, and waste can also be transported in the direction away from the partition wall by the force of the third gas ejected laterally.

  The jet nozzle may be provided to jet a third gas obliquely upward on the second chamber side.

  As a result, the second gas can be easily separated from the vicinity of the partition wall, and the flow of the second gas from the lower side to the upper side of the second chamber is promoted, and the second gas is guided to the upper side of the second chamber it can.

  The third gas flow passage circulates the third gas through the partition wall so as to be capable of exchanging heat with the first gas or the second gas, and the third gas when flowing through the third gas flow passage is a third gas flow passage. The temperature may be lower than the first gas or the second gas.

  As a result, while preventing mixing of the first gas and the second gas as described above, the first gas or the second gas can be cooled using the third gas, and equalization of the temperature distribution in the incinerator can be expected. . In addition, it is possible to prevent the compartment wall from being excessively heated by the high temperature of the first gas or the second gas by circulating the third gas whose temperature is lower than the first gas or the second gas to the third gas flow passage. . Further, even when the temperature difference between the first gas and the second gas is large, by cooling the partition wall with the third gas, thermal deformation and thermal damage of the partition wall can be prevented, and the partition wall can be stably maintained. .

  The partition wall includes a pair of side walls provided between the first chamber and the third gas flow passage, and side walls provided between the second chamber and the third gas flow passage. In the third gas flow passage, a plurality of horizontally extending fins connected to each of the pair of side walls are vertically juxtaposed in the third gas flow passage, and adjacent fins in the vertical direction are different from each other It may extend intermittently at the position.

  According to the above configuration, the flow of the third gas in the third gas flow passage can be easily adjusted to turbulent flow at the positions where the respective fins are interrupted, and the temperature distribution of the third gas flowing in the third gas flow passage is biased Of the first gas or the second gas can be stably exchanged with the third gas.

  The partition wall includes a pair of side walls provided between the first chamber and the third gas flow passage, and side walls provided between the second chamber and the third gas flow passage. A plurality of horizontally extending fins, which have side walls and are connected to each of the pair of side walls in the third gas flow passage, are vertically juxtaposed, and one of the longitudinal ends of each of the fins is provided. A gap may be alternately provided in the vertical direction between the end of the and the partition wall.

  According to the above configuration, the flow of the third gas in the third gas flow passage can be maintained long in the horizontal direction along each fin, and the flowability of the third gas can be enhanced. Therefore, the first gas or the second gas can be efficiently heat-exchanged with the third gas.

  The partition wall includes a pair of side walls provided between the first chamber and the third gas flow passage, and side walls provided between the second chamber and the third gas flow passage. A plurality of horizontally extending fins, each having a side wall, arranged in the third gas flow passage so as to alternately protrude in the vertical direction from one side wall of the pair of side walls to the other side wall. A gap may be provided between the protruding end of each fin and the other side wall.

  According to the above configuration, in the third gas flow passage, the first gas or the second gas can be maintained while securing both the flowability of the third gas in the horizontal direction and the flowability of the third gas in the vertical direction. The gas can be efficiently heat-exchanged with the third gas. Moreover, each fin is connected only to one side wall of a pair of side walls, and a pair of side walls are not mutually restrained. For this reason, since it becomes difficult to generate a thermal stress in a section wall, a section wall can be maintained stably.

  The first chamber is a drying chamber for waste, the first gas is a dried exhaust gas generated by drying the waste, and the second chamber is a combustion that burns the dried waste in the drying chamber. It is a chamber, and the second gas may be a combustion gas generated by the combustion of waste.

  According to the above configuration, the mixing of the dry exhaust gas and the combustion gas in the furnace is prevented by using the partition wall of any of the above-described forms and the third gas, and the dry exhaust gas and the combustion gas are easily made It can be divided into

  The jet nozzle may be a first jet nozzle, and the partition wall may be provided with a second jet nozzle for jetting a third gas into the second chamber from a side surface of the second chamber. .

  According to the above configuration, it is easy to adjust the combustion state of the waste by affecting the flow of the combustion gas generated by the combustion of the waste by the third gas ejected into the combustion chamber from the second jet port it can.

  The third gas may be part of the first gas exhausted from the drying chamber. Thereby, when using a part of 1st gas discharged | emitted from the drying chamber, for example for electric power generation of an electric power generating apparatus, stable electric power generation can be performed, suppressing the fluctuation | variation of the component of 1st gas.

  The third gas may be air. Thus, even if there is unburned gas in the combustion chamber, the unburned gas can be burned with air, and the combustion efficiency of the incinerator can be enhanced.

  The third gas may be an EGR (Exhaust Gas Recirculation) gas exhausted from the combustion chamber.

  Thus, by using the EGR gas as the third gas, excessive combustion of waste can be suppressed by the EGR gas flowing into the combustion chamber. Therefore, excessive temperature rise of the combustion chamber can be prevented, and the temperature distribution in the incinerator can be adjusted.

  According to each aspect of the present invention described above, in the fluidized bed incinerator, it is possible to appropriately prevent the mixing of the gas in each chamber in the incinerator.

It is a figure showing the whole incineration system concerning a 1st embodiment. It is a figure showing the whole incineration system concerning a 2nd embodiment. It is a figure showing the whole incineration system concerning a 3rd embodiment. It is a figure which shows a part of incineration system which concerns on 4th Embodiment. It is a figure which shows a part of incineration system which concerns on 5th Embodiment. It is a figure which shows a part of incineration system which concerns on 6th Embodiment. It is a figure which shows a part of incineration system which concerns on 7th Embodiment. It is sectional drawing of the thickness direction of the section wall which concerns on 8th Embodiment. It is a longitudinal direction sectional view of the section wall concerning an 8th embodiment. It is a longitudinal direction sectional view of the section wall concerning a 9th embodiment. It is thickness direction sectional drawing of the section wall which concerns on 10th Embodiment. It is a longitudinal direction sectional view of the section wall concerning a 10th embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First Embodiment
FIG. 1 is a view showing the entire incineration system 1 according to the first embodiment. The incineration system 1 shown in FIG. 1 is a wet biomass incineration system which incinerates wet biomass such as sewage sludge or wood-based material as an example of waste, and comprises an incinerator 2, a dust collector 3, a power generator 4, air preheating. , Waste heat boiler 6, wet biomass supply passage R1, drying gas supply passage R2, dry exhaust gas discharge passage R3, air supply passage R4, combustion gas discharge passage R5, combustion ash discharge passage R6 and dry exhaust gas flow passage R7. Prepare.

  The incinerator 2 is a fluidized bed type (as one example, an internal circulating fluidized bed type). A drying chamber (first chamber) 2a for heating and drying the wet biomass M, which is an example of a waste, by dividing the spaces S1 and S2 above the hearth 2i by the dividing wall 2e inside the incinerator 2 And the combustion chamber (2nd chamber) 2b which burns the dry biomass which is the biomass M heat-dried by the drying chamber 2a is formed. Furthermore, the incinerator 2 is provided with fluidized beds 2c and 2d which are continuous with each other between the lower side in the drying chamber 2a and the lower side in the combustion chamber 2b. The fluidized beds 2 c and 2 d are configured using a fluid medium F. The fluid medium F is, for example, silica sand, but the fluid medium F is not limited thereto.

  Above the drying chamber 2a, a wet biomass feed passage R1 for supplying the wet biomass M from the outside into the drying chamber 2a is connected. Below the fluidized bed 2c of the drying chamber 2a, a wind box 2f, which is a hollow box inside, is provided. The air box 2f is connected to a drying gas supply passage R2 for supplying a drying gas to the drying chamber 2a by driving the pump P1 to dry the wet biomass M while mixing it with the fluid medium (particulate matter) F. Ru. During the operation of the incineration system 1, the drying exhaust gas (first gas) generated by the drying of the wet biomass M is filled in the drying chamber 2a. Above the drying chamber 2a, a dry exhaust gas discharge passage R3 for discharging the dried exhaust gas to the outside of the drying chamber 2a is connected.

  Below the fluidized bed 2d of the combustion chamber 2b, an air box 2g having substantially the same configuration as the air box 2f is provided. Below the air box 2g, an air supply passage R4 is connected to supply air to the combustion chamber 2b by driving the blower B2 as a combustion gas to be burned while mixing dry biomass with the fluid medium F. During operation of the incineration system 1, the combustion chamber 2b is filled with the combustion gas (second gas) generated by the combustion of the dry biomass. The air box 2f, 2g is partitioned by a partition wall 2h. A combustion gas discharge passage R5 for discharging the combustion gas to the outside of the combustion chamber 2b is connected above the combustion chamber 2b.

  A hearth 2i is provided below each of the fluidized beds 2c and 2d. The hearth 2i has a first hearth 2i1 disposed on the drying chamber 2a side and a second hearth 2i2 provided on the combustion chamber 2b side. The fluidized beds 2c and 2d described above are continuously provided on the upper surfaces of the first hearth 2i1 and the second hearth 2i2. In the hearth 2i, a plurality of nozzles 2j are provided in a distributed manner. The drying gas supplied from the drying gas supply passage R2 is sprayed from the nozzles 2j provided in the first hearth floor 2i1 into the drying chamber 2a via the air box 2f. In the fluidized bed 2c, the wet biomass M flows with the fluid medium F by the flow of the drying gas injected from each nozzle 2j, and is heated and dried while being stirred and mixed. Thereby, wet biomass M turns into dry biomass. As shown in FIG. 1, dry biomass is conveyed from the drying chamber 2a to the combustion chamber 2b. From each nozzle 2j provided in the second hearth 2i2, the air supplied from the air supply path R4 is injected into the combustion chamber 2b via the air box 2g. In the fluidized bed 2d, the dry biomass flows together with the fluid medium F by the flow of air injected from each nozzle 2j, and is burned while being stirred and mixed. Thereby, combustion gas is generated. The heat of the combustion chamber 2b moves to the drying chamber 2a side together with the fluid medium F, and is used to heat and dry the wet biomass M in the drying chamber 2a.

  A combustion ash discharge passage R6 for discharging combustion ash of dry biomass is connected to the combustion chamber 2b. The combustion ash (incineration ash) generated along with the combustion of the dry biomass is discharged out of the combustion chamber 2b via the combustion ash discharge passage R6.

  Partition wall 2 e is provided to extend vertically from the ceiling of incinerator 2. At the lower end of the partition wall 2e, a jet port 2e1 for jetting the third gas from the inside is formed. The lower end of the partition wall 2e is buried in the fluidized beds 2c and 2d. The partition wall 2e has a pair of side walls 2e2 and 2e3 of a drying chamber side wall 2e2 and a combustion chamber side wall 2e3. A dry exhaust gas flow passage R7 is provided between the pair of side walls 2e2 and 2e3. The drying chamber side wall 2e2 is provided between the drying chamber 2a and the drying exhaust gas flow passage R7. The combustion chamber side wall 2e3 is provided between the combustion chamber 2b and the dry exhaust gas flow passage R7. The pair of side walls 2e2 and 2e3 are provided to face each other at a predetermined distance.

  The drying exhaust gas flow passage R7 extends to the outside of the incinerator 2. The dry exhaust gas flow passage R7 is connected to the dry exhaust gas discharge passage R3, and a part (third gas) of the dry exhaust gas flowing in the dry exhaust gas discharge passage R3 flows. Thus, the dry exhaust gas flow passage R7 functions as a third gas flow passage. The third gas is, for example, lower temperature than the dry exhaust gas and the combustion gas. Specifically, at the lower end of the partition wall 2e, a plurality of the jet outlets 2e1 are arranged in parallel at intervals in the longitudinal direction (the direction perpendicular to the paper surface of FIG. 1) of the pair of side walls 2e2 and 2e3. From the spout 2e1, the third gas flowing through the dried exhaust gas flow passage R7 is ejected into the fluidized beds 2c and 2d by the drive of the blower B1. The spout 2e1 is provided, for example, to spout the third gas toward the first hearth 2i1 along the vertical direction. The thickness of each of the pair of side walls 2e2 and 2e3 is set such that the third gas flowing through the dry exhaust gas flow passage R7 can exchange heat with the dry exhaust gas or the combustion gas.

  The dust collector 3 is provided in the dry exhaust gas discharge passage R3. The dust collector 3 recovers soot dust mixed in the dried exhaust gas flowing in the dried exhaust gas discharge passage R3. The power generation device 4 is provided in the dry exhaust gas discharge passage R3 downstream of the position where the dust collector 3 is provided. The power generation device 4 is a binary power generation device as an example.

  The air preheater 5 is provided across the air supply passage R4 and the combustion gas discharge passage R5. The air preheater 5 preheats the air supplied to the air box 2g by heat exchange with the combustion gas. The waste heat boiler 6 is provided across the drying gas supply passage R2 and the combustion gas discharge passage R5. The waste heat boiler 6 heats the drying gas supplied to the air box 2 f by heat exchange with the combustion gas.

  In the incinerator 2, the third gas flowing through the drying exhaust gas flow passage R7 is ejected from the partition wall 2e into the fluidized beds 2c and 2d, so that the third gas flows to dry the fluidized beds 2c and 2d. The movement of the dry exhaust gas and the combustion gas between the chamber 2a and the combustion chamber 2b can be restricted. By using the force of the third gas spouted from the spout 2e1 of the partition wall 2e, dry exhaust gas and combustion occur in the fluidized beds 2c and 2d without providing a large-scale device or structure in the incinerator 2. The gases can be separated from one another to prevent them from mixing with one another. Moreover, while the partition walls 2e are interposed, the dried biomass can be transported from the drying chamber 2a to the combustion chamber 2b using the fluidized beds 2c and 2d, while the drying chambers 2a and the combustion chambers 2b are disposed in the fluidized beds 2c and 2d. The movement of the dry exhaust gas and the combustion gas between the two can be restricted, and the mixing of the dry exhaust gas and the combustion gas can be prevented.

  Thus, by restricting the movement of the dry exhaust gas and the combustion gas between the drying chamber 2a and the combustion chamber 2b, the dry exhaust gas and the combustion gas can be easily divided and managed. Therefore, for example, the fluctuation | variation of the component of the dry waste gas used for the electric power generation of the electric power generating apparatus 4 can be suppressed, and the stable electric power generation can be performed.

  Further, as described above, by providing the partition wall 2e extending vertically from the ceiling in the incinerator 2, the dried exhaust gas in the drying chamber 2a and the combustion gas in the combustion chamber 2b are fluidized beds 2c, 2d. The division wall 2e can prevent the mixing above. Further, the third gas spouted from the spout 2e1 provided at the lower end of the section wall 2e prevents the dry exhaust gas and the combustion gas from being mixed in the vicinity of the spout 2e1 of the section wall 2e in the fluidized beds 2c and 2d. it can. Furthermore, the third gas is blown into both the drying chamber 2a and the combustion chamber 2b by jetting the third gas in the vertical direction from the partition wall 2e, which affects the flow of each of the dry exhaust gas and the combustion gas, The flow of both the dry exhaust gas and the combustion gas can be regulated to be separated from the partition wall 2e.

  In addition, by recycling the dried exhaust gas and using it as the third gas, the process balance (the combustion reaction of the dried biomass and the temperature distribution in the incinerator 2) of the incineration system 1 can be hardly broken. Therefore, the degree of freedom in adjusting the flow rate of the third gas can be increased.

  Also, the third gas is circulated in the dry exhaust gas flow passage R7 so as to be heat exchangeable with the dry exhaust gas or combustion gas through the partition wall 2e, and the third gas in the dry exhaust gas flow passage R7 is dried exhaust gas or combustion By setting the temperature lower than the gas, it is possible to cool the dried exhaust gas or the combustion gas with the third gas while preventing the mixing of the dried exhaust gas and the combustion gas as described above, and it is expected to make the temperature distribution in the incinerator 2 uniform. it can. Further, since the partition wall 2e can be cooled by the low temperature third gas, excessive heating of the partition wall 2e by the dry exhaust gas or the combustion gas can be prevented. Also, even when the temperature difference between the dried exhaust gas and the combustion gas is large, cooling the partition wall 2e with the third gas prevents deformation due to thermal expansion of the partition wall 2e and thermal damage due to high temperature, and is stable. The partition wall 2e can be maintained. Therefore, the partition wall 2e can be made of, for example, a metal material. The temperature of the partition wall 2e and the temperatures of the dried exhaust gas and the combustion gas can be adjusted in predetermined ranges, respectively, by adjusting the flow rate of the third gas in the dried exhaust gas flow passage R7. Further, by adjusting the dry exhaust gas pressure in the drying chamber 2a and the combustion gas pressure in the combustion chamber 2b as much as possible, mixing of the dry exhaust gas and the combustion gas can be further prevented.

  Hereinafter, each other embodiment of the present invention will be described focusing on differences from the first embodiment.

Second Embodiment
FIG. 2 is a view showing the whole of the incineration system 1 according to the second embodiment. As shown in FIG. 2, in the incineration system 1, the air flow passage R <b> 8 is connected to the air supply passage R <b> 4 on the upstream side of the air preheater 5. The air flow passage R8 functions as a third gas flow passage. Thus, air is used as the third gas.

  In the second embodiment, by using air as the third gas, the inflow of the dry gas into the combustion chamber 2 b can be suppressed, and a decrease in the combustion efficiency of the incinerator 2 can be prevented. Further, the third gas can be favorably supplied into the furnace by the blower B2 provided on the upstream side of the air supply passage R4, without separately providing a blowing fan or the like in the air flow passage R8.

Third Embodiment
FIG. 3 is a view showing the whole of the incineration system 1 according to the third embodiment. As shown in FIG. 3, in the incineration system 1, the combustion gas flow passage R <b> 9 is connected to the combustion gas discharge passage R <b> 5 downstream of the waste heat boiler 6. The combustion gas flow passage R9 functions as a third gas flow passage. Thus, the combustion gas is used as the third gas.

  By using the combustion gas (EGR gas) in which the oxygen component is reduced and becomes inactive as the third gas, it is possible to suppress excessive combustion of the dry biomass in the combustion chamber 2b. Thereby, the excessive temperature rise of the combustion chamber 2b can be prevented, and the temperature distribution in the incinerator 2 can be adjusted. Further, since the combustion gas is recirculated and used as the third gas, the process balance of the incineration system 1 is not easily disturbed as in the first embodiment, and the degree of freedom in adjusting the flow rate of the third gas can be enhanced.

Fourth Embodiment
FIG. 4 is a view showing a part of the incineration system 1 according to the fourth embodiment. As shown in FIG. 4, in the partition wall 2e of the incinerator 2, a jet port 2e1 is provided in the fluidized beds 2c and 2d so as to eject the third gas toward the second hearth 2i2. In this manner, by blowing out the third gas, the combustion gas in the combustion chamber 2b can be easily separated from between the jet 2e 1 of the partition wall 2e and the fluidized bed 2d in the fluidized beds 2c and 2d. The movement of the combustion gas from the 2b side to the drying chamber 2a can be regulated more satisfactorily.

Fifth Embodiment
FIG. 5 is a view showing a part of the incineration system 1 according to the fifth embodiment. As shown in FIG. 5, in the partition wall 2e of the incinerator 2, in the fluidized beds 2c and 2d, the jet port 2e1 jets the third gas laterally from the inside of the fluidized bed 2d on the combustion chamber 2b side. Provided to As described above, by ejecting the third gas from the spout 2e1, the combustion gas can be easily separated from the side wall 2e3 of the partition wall 2e in the fluidized beds 2c and 2d, and the force of the third gas ejected laterally The dry biomass can be transported in the direction away from the partition wall 2e.

Sixth Embodiment
FIG. 6 is a view showing a part of the incineration system 1 according to the sixth embodiment. As shown in FIG. 6, in the partition wall 2e of the incinerator 2, in the fluidized beds 2c and 2d, the jet spout 2e1 spouts the third gas obliquely upward from the lower side of the combustion chamber 2b side. Provided. In this manner, the combustion gas can be easily separated from the vicinity of the outlet 2e1 of the partition wall 2e by ejecting the third gas, and the flow of the combustion gas in the direction from the bottom to the top of the combustion chamber 2b is promoted. The combustion gas can be guided to the upper side of the combustion chamber 2b. Therefore, for example, as shown in FIG. 6, when the combustion gas exhaust passage R5 is provided above the combustion chamber 2b, the combustion gas can be promptly exhausted from the combustion chamber 2b.

Seventh Embodiment
FIG. 7 is a view showing a part of the incineration system 1 according to the seventh embodiment. As shown in FIG. 7, in the section wall 2 e of the incinerator 2, the spout 2 e 1 is used as a first spout. In the partition wall 2e, a second jet port 2e4 is further provided in the combustion chamber side wall 2e3. The second jet port 2e4 is disposed at a position higher than the bed height of the fluidized bed 2d so that the third gas can be ejected into the combustion chamber 2b from the side surface on the combustion chamber 2b side.

  By affecting the flow of the combustion gas by the third gas ejected from the second nozzle 2e4 to the combustion chamber 2b, for example, the concentration of the combustion gas around the dry biomass is changed to burn the dry biomass It is easy to adjust the condition. Moreover, the temperature distribution in the incinerator 2 can be adjusted. In addition, when using air as 3rd gas, combustion of dry biomass can be promoted by using the 3rd gas spouted from the 2nd jet nozzle 2e4 as secondary air, for example. Moreover, when gas (non-oxidizing gas) with low oxygen concentration, such as dry waste gas or combustion gas, is used as the third gas, combustion of dry biomass can be suppressed.

  In addition, the 2nd jet nozzle 2e4 is not limited to one, You may be plural. Further, the second jet ports 2e4 can be provided at a plurality of positions in the vertical direction of the combustion chamber side wall 2e3.

Eighth Embodiment
FIG. 8 is a cross-sectional view in the thickness direction of the partition wall 2e according to the eighth embodiment. FIG. 9 is a longitudinal sectional view of a section wall 2e according to an eighth embodiment. In FIG. 8, the fins 2 e 5 located on the back side of the drawing are indicated by broken lines. As shown in FIGS. 8 and 9, in the section wall 2e of the incinerator 2, a plurality of fins 2e5 are provided connected to each of the pair of side walls 2e2 and 2e3 in the dry exhaust gas flow passage R7. The fins 2e5 extend in the horizontal direction and are juxtaposed in the vertical direction. The vertically adjacent fins 2e5 extend intermittently at different positions. Here, the “horizontal direction” is not limited to the exact horizontal direction, and includes, for example, a direction inclined at an angle of several degrees or less with respect to the horizontal direction. The position where each of the fins 2e5 is intermittent may be, for example, a random position for each fin 2e5 or the same position in the fins 2e5 arranged at regular intervals in the vertical direction.

  By using such partition wall 2e, the flow of the third gas flowing through the dry exhaust gas flow passage R7 is branched in the horizontal direction and the vertical direction at the positions where the respective fins 2e5 are interrupted, and the inside of the dry exhaust gas flow passage R7 It is easy to adjust the third gas flowing through to the turbulent flow. Therefore, it is possible to suppress deviation of the temperature distribution of the third gas flowing in the dry exhaust gas flow passage R7, and to facilitate stable heat exchange of the dry exhaust gas or the combustion gas with the third gas.

The ninth embodiment
FIG. 10 is a longitudinal sectional view of a section wall 2e according to a ninth embodiment. As shown in FIG. 10, as a difference from the eighth embodiment, in the section wall 2e of the incinerator 2, the plurality of fins 2e5 extend in the horizontal direction and are juxtaposed in the vertical direction. A gap G1 is provided between any one of the longitudinal ends of each fin 2e5 and the partition wall 2e. The gaps G1 are alternately provided in the vertical direction.

  By using such a partition wall 2e, the flow of the third gas in the dried exhaust gas flow passage R7 can be secured long in the horizontal direction along the fin 2e5. Thus, the flowability of the third gas in the horizontal direction can be enhanced. Therefore, the dried exhaust gas or combustion gas can be efficiently heat-exchanged with the third gas.

Tenth Embodiment
FIG. 11 is a cross-sectional view in the thickness direction of a partition wall 2e according to a tenth embodiment. FIG. 12 is a longitudinal sectional view of a partition wall 2e according to a tenth embodiment. As shown in FIGS. 11 and 12, as a difference from the eighth embodiment, in the section wall 2e of the incinerator 2, a plurality of fins 2e5 extend in the horizontal direction, and one of the pair of side walls 2e2 and 2e3. They are juxtaposed so as to alternately protrude in the vertical direction from the side wall toward the other side wall. A gap G2 is provided between the tip end of each fin 2e5 on the protruding side and the other side wall.

  By using such a partition wall 2e, the third gas is caused to flow between the fins 2e5 and in the gap G2 in the dry exhaust gas flow passage R7, whereby the third gas can be circulated in the horizontal direction, Both the flowability of the third gas in the direction can be secured. Thus, the dried exhaust gas or the combustion gas can be efficiently heat-exchanged with the third gas. Further, since each fin 2e5 is connected to only one of the pair of side walls 2e2 and 2e3, the pair of side walls 2e2 and 2e3 are not constrained to each other. For this reason, thermal stress is unlikely to occur in the partition wall 2e. Therefore, the partition wall 2e can be stably maintained.

  In each of the fourth to sixth and eighth embodiments, the case where dry exhaust gas is used as the third gas is shown. However, as the third gas, any of air and combustion gas may be used.

(Others)
The present invention is not limited to the embodiments described above, and the configuration can be changed, added or deleted without departing from the spirit of the present invention. Each of the above embodiments may be arbitrarily combined with each other, and for example, some configurations in one embodiment may be applied to the other embodiments.

  In the above embodiments, the first chamber is a drying chamber, and the second chamber is a combustion chamber. However, the first chamber is not limited to the drying chamber, and the second chamber is not limited to the combustion chamber. In each of the above embodiments, the first gas is a dry exhaust gas and the second gas is a combustion gas. However, the first gas is not limited to the dry exhaust gas, and the second gas is not limited to the combustion gas. The first gas and the second gas may have different or identical components or component ratios. Further, in the first chamber, the gas injected from the first hearth may be the first gas. In the second chamber, the gas injected from the second hearth may be the second gas. Moreover, although wet biomass was illustrated as a waste in each said embodiment, a waste is not limited to wet biomass.

G1, G2 gap F fluid medium M wet biomass (waste)
R7 Dry exhaust gas flow passage (3rd gas flow passage)
R8 Air flow passage (3rd gas flow passage)
R9 combustion gas flow passage (third gas flow passage)
2 Incinerator (fluid bed incinerator)
2a Drying Room (First Room)
2b Combustion chamber (second chamber)
2c, 2d fluid bed 2e compartment wall 2e1 spout (first spout)
2e2 drying chamber side wall 2e3 combustion chamber side wall 2e4 second spout 2e5 fin 2i hearth

Claims (10)

A first chamber filled with the first gas by the gas injected from the first hearth, and a second chamber filled with the second gas by the gas injected from the second hearth continuous with the first hearth And a partition wall partitioning the inside of the furnace into the first chamber and the second chamber, and provided continuously on the first hearth and the second hearth below the partition wall, and flowing And a fluidized bed in which the medium flows;
The partition wall is provided with a third gas flow passage through which the third gas flows, and an ejection port for ejecting the third gas is formed in the fluidized bed,
The partition wall is provided so as to extend in the vertical direction from a ceiling in the furnace, and the spout is provided at least at the lower end of the partition wall.
The spout is provided to spout a third gas in the vertical direction,
A fluidized bed incinerator wherein the third gas is air. A first chamber filled with the first gas by the gas injected from the first hearth, and a second chamber filled with the second gas by the gas injected from the second hearth continuous with the first hearth And a partition wall partitioning the inside of the furnace into the first chamber and the second chamber, and provided continuously on the first hearth and the second hearth below the partition wall, and flowing And a fluidized bed in which the medium flows;
The partition wall is provided with a third gas flow passage through which the third gas flows, and an ejection port for ejecting the third gas is formed in the fluidized bed,
The partition wall is provided so as to extend in the vertical direction from a ceiling in the furnace, and the spout is provided at least at the lower end of the partition wall.
The jet nozzle is provided to jet a third gas obliquely upward on the second chamber side,
A fluidized bed incinerator wherein the third gas is air . The third gas flow passage passes the third gas through the partition wall so as to be heat exchangeable with the first gas or the second gas,
The fluid bed incinerator according to claim 1 or 2, wherein the third gas flowing through the third gas flow passage is at a lower temperature than the first gas or the second gas . The partition wall includes a pair of side walls provided between the first chamber and the third gas flow passage, and side walls provided between the second chamber and the third gas flow passage. Have side walls,
In the third gas flow passage, a plurality of horizontally extending fins connected to each of the pair of side walls are vertically juxtaposed, and each vertically adjacent fin is interrupted at different positions. A fluid bed incinerator according to claim 3 which extends . The partition wall includes a pair of side walls provided between the first chamber and the third gas flow passage, and side walls provided between the second chamber and the third gas flow passage. Have side walls,
In the third gas flow passage, a plurality of horizontally extending fins connected to each of the pair of side walls are vertically juxtaposed, and either end of the longitudinal ends of each fin, The fluidized bed incinerator according to claim 3 , wherein gaps are provided alternately in the vertical direction between the partition walls . The partition wall includes a pair of side walls provided between the first chamber and the third gas flow passage, and side walls provided between the second chamber and the third gas flow passage. Have side walls,
In the third gas flow passage, a plurality of horizontally extending fins are juxtaposed so as to alternately protrude in the vertical direction from one side wall of the pair of side walls toward the other side wall. The fluidized bed incinerator according to claim 3 , wherein a gap is provided between the tip of the projecting side of the fin and the other side wall . The first chamber is a drying chamber for waste, the first gas is a dried exhaust gas generated by drying the waste, and the second chamber is a combustion that burns the dried waste in the drying chamber. The second gas is the combustion gas produced by the combustion of the waste,
The jet nozzle is a first jet nozzle, and the partition wall is provided with a second jet nozzle for jetting a third gas into the second chamber from a side surface on the second chamber side. A fluid bed incinerator according to any one of the preceding items. A first chamber filled with the first gas by the gas injected from the first hearth, and a second chamber filled with the second gas by the gas injected from the second hearth continuous with the first hearth And a partition wall partitioning the inside of the furnace into the first chamber and the second chamber, and provided continuously on the first hearth and the second hearth below the partition wall, and flowing And a fluidized bed in which the medium flows;
The partition wall is provided with a third gas flow passage through which the third gas flows, and an ejection port for ejecting the third gas is formed in the fluidized bed,
The third gas flow passage passes the third gas through the partition wall so as to be heat exchangeable with the first gas or the second gas,
The third gas when flowing through the third gas flow passage is at a lower temperature than the first gas or the second gas,
The partition wall includes a pair of side walls provided between the first chamber and the third gas flow passage, and side walls provided between the second chamber and the third gas flow passage. Have side walls,
In the third gas flow passage, a plurality of horizontally extending fins connected to each of the pair of side walls are vertically juxtaposed, and each vertically adjacent fin is interrupted at different positions. Extend,
A fluidized bed incinerator wherein the third gas is air . A first chamber filled with the first gas by the gas injected from the first hearth, and a second chamber filled with the second gas by the gas injected from the second hearth continuous with the first hearth And a partition wall partitioning the inside of the furnace into the first chamber and the second chamber, and provided continuously on the first hearth and the second hearth below the partition wall, and flowing And a fluidized bed in which the medium flows;
The partition wall is provided with a third gas flow passage through which the third gas flows, and an ejection port for ejecting the third gas is formed in the fluidized bed,
The third gas flow passage passes the third gas through the partition wall so as to be heat exchangeable with the first gas or the second gas,
The third gas when flowing through the third gas flow passage is at a lower temperature than the first gas or the second gas,
The partition wall includes a pair of side walls provided between the first chamber and the third gas flow passage, and side walls provided between the second chamber and the third gas flow passage. Have side walls,
In the third gas flow passage, a plurality of horizontally extending fins connected to each of the pair of side walls are vertically juxtaposed, and either end of the longitudinal ends of each fin, A gap is alternately provided in the vertical direction between the partition wall and the partition wall,
A fluidized bed incinerator wherein the third gas is air . A first chamber filled with the first gas by the gas injected from the first hearth, and a second chamber filled with the second gas by the gas injected from the second hearth continuous with the first hearth And a partition wall partitioning the inside of the furnace into the first chamber and the second chamber, and provided continuously on the first hearth and the second hearth below the partition wall, and flowing And a fluidized bed in which the medium flows;
The partition wall is provided with a third gas flow passage through which the third gas flows, and an ejection port for ejecting the third gas is formed in the fluidized bed,
The third gas flow passage passes the third gas through the partition wall so as to be heat exchangeable with the first gas or the second gas,
The third gas when flowing through the third gas flow passage is at a lower temperature than the first gas or the second gas,
The partition wall includes a pair of side walls provided between the first chamber and the third gas flow passage, and side walls provided between the second chamber and the third gas flow passage. Have side walls,
In the third gas flow passage, a plurality of horizontally extending fins are juxtaposed so as to alternately protrude in the vertical direction from one side wall of the pair of side walls toward the other side wall. A gap is provided between the tip of the projecting side of the fin and the other side wall,
A fluidized bed incinerator wherein the third gas is air .

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