WASTE INCINERATION FACILITY

Abstract

The waste incineration facility includes a waste pit for receiving waste and an incinerator for incinerating the waste stored in the waste pit. The waste incineration facility further includes: a fermentation dryer configured to ferment and dry the waste while heating the waste to a predetermined temperature range under reduced pressure; and a storage hopper configured to store a fermented dried product produced in the fermentation dryer. The fermented dried product stored in the storage hopper is charged into the incinerator to incinerate the fermented dried product. The waste incineration facility further includes: a first conveyor connecting the waste pit and the fermentation dryer; and a second conveyor connecting the fermentation dryer and the storage hopper. The first conveyor and the second conveyor are driven to continuously perform production of the fermented dried product from the waste in the waste pit and storage of the fermented dried product in the storage hopper.

Claims

1. A waste incineration facility including a waste pit for receiving waste and an incinerator for incinerating the waste stored in the waste pit, the waste incineration facility comprising: a fermentation dryer configured to ferment and dry the waste while heating the waste to a predetermined temperature range under reduced pressure; and a storage hopper for storing a fermented dried product produced in the fermentation dryer, wherein the waste incineration facility is configured such that the fermented dried product stored in the storage hopper is charged into the incinerator and the fermented dried product is incinerated.

2. The waste incineration facility of claim 1, further comprising: a first conveyor connecting the waste pit and the fermentation dryer; and a second conveyor connecting the fermentation dryer and the storage hopper, wherein the waste incineration facility is configured such that the first conveyor and the second conveyor are driven to continuously perform the production of the fermented dried product from the waste in the waste pit and the storage of the fermented dried product in the storage hopper.

3. The waste incineration facility of claim 2, further comprising: a boiler configured to recover heat of exhaust gas generated by combustion of the fermented dried product in a combustion chamber of the incinerator, wherein the boiler and the fermentation dryer are connected to each other by a steam supply path, and the waste incineration facility is configured such that steam generated in the boiler is supplied to the fermentation dryer through the steam supply path and used to heat the waste.

4. The waste incineration facility of claim 3, wherein the fermentation dryer includes: a sealed container having a storage for storing the waste, a waste inlet, and an outlet; a charge pipe connecting a downstream end of the first conveyor and the waste inlet; and a discharge pipe connecting the outlet and an upstream end of the second conveyor, the charge pipe is provided with a first charge valve, a second charge valve, and a charge-side temporary reservoir provided between the first charge valve and the second charge valve, the discharge pipe is provided with a first discharge valve, a second discharge valve, and a discharge-side temporary reservoir provided between the first discharge valve and the second discharge valve, the first charge valve, the second charge valve, the first discharge valve, and the second discharge valve are controlled by a valve controller, and the waste incineration facility is configured such that the waste is charged into the storage based on control by the valve controller so that only one of the first charge valve or the second charge valve is opened, and the fermented dried product is discharged from the storage based on control by the valve controller so that only one of the first discharge valve or the second discharge valve is opened.

5. The waste incineration facility of claim 3, further comprising: a steam control device configured to control an amount of the steam supplied to the fermentation dryer, wherein the steam control device includes: a conveyer speed adjuster configured to adjust conveyance speeds of the first conveyor and the second conveyor; and a furnace charge amount adjuster configured to adjust a charge amount of the fermented dried product from the storage hopper into the combustion chamber of the incinerator.

6. The waste incineration facility of claim 4, further comprising: a steam control device configured to control an amount of the steam supplied to the fermentation dryer, wherein the steam control device includes: a conveyer speed adjuster configured to adjust conveyance speeds of the first conveyor and the second conveyor; and a furnace charge amount adjuster configured to adjust a charge amount of the fermented dried product from the storage hopper into the combustion chamber of the incinerator.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 is an overall schematic diagram of a waste incineration facility according to a first embodiment of the present invention.

[0021] FIG. 2 is schematic diagram of a fermentation dryer and its surroundings according to the first embodiment.

[0022] FIG. 3 is a schematic diagram mainly showing a boiler according to the first embodiment and the flow of steam generated in the boiler.

[0023] FIG. 4 is a block diagram showing connection of an integrated control device of a waste incineration facility and a steam control device of the waste incineration facility according to the first embodiment to each part to be controlled.

[0024] FIG. 5 is an overall schematic diagram of a waste incineration facility according to a second embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

[0025] Embodiments of the present invention will be described with reference to the drawings.

[0026] FIG. 1 is an overall schematic diagram of a waste incineration facility 1 according to a first embodiment of the present invention. The waste incineration facility 1 according to the first embodiment is a facility for incinerating general waste such as municipal refuse that has been carried in. In particular, the waste incineration facility 1 is suitable for treatment of waste containing a large amount of organic waste such as garbage. As illustrated in FIG. 1, the waste incineration facility 1 includes a waste pit 2 for receiving waste and an incinerator 7 for incinerating the waste stored in the waste pit 2. The waste pit 2 is provided for temporarily storing the waste carried thereinto from a garbage truck G. The incinerator 7 is of a stoker type, and a known structure is used. The incinerator 7 includes a combustion stoker 72 and a post-combustion stoker 73.

[0027] A primary combustion chamber 77 is formed above the combustion stoker 72 and the post-combustion stoker 73. A secondary combustion chamber 78 is formed above the primary combustion chamber 77. A second air supply box 75 is provided below the combustion stoker 72. A third air supply box 76 is provided below the post-combustion stoker 73. Primary air is supplied from a primary air supply device 14 to the second air supply box 75 and the third air supply box 76. Primary air is supplied from below the stoker to the primary combustion chamber 77 above the stoker for primary combustion of the waste on the stoker. Secondary air is supplied from a secondary air supply device 15 to the secondary combustion chamber 78. In the secondary combustion chamber 78, unburned gas and unburned matter generated in the primary combustion chamber (77) are secondarily combusted.

[0028] The waste in the waste pit 2 which has been fermented and dried is charged into the incinerator 7 having the above-described configuration. Specifically, the waste incineration facility 1 includes a first conveyor 3, a fermentation dryer 4, a second conveyor 5, and a storage hopper 6 between the waste pit 2 and the incinerator 7. The fermentation dryer 4 is a device that ferments and dries the waste while heating the waste to a predetermined temperature range (e.g., 60 C. to 65 C.) under reduced pressure. The storage hopper 6 stores a fermented dried product produced in the fermentation dryer 4. The storage hopper 6 is connected to an inlet of the primary combustion chamber 77 of the incinerator 7. A wall separating the storage hopper 6 and the primary combustion chamber 77 is provided with a storage hopper charge door 6a. By opening the storage hopper charge door 6a, the fermented dried product stored in the storage hopper 6 is charged into the incinerator 7. The fermented dried product is incinerated while being sequentially moved on the combustion stoker 72 and the post-combustion stoker 73.

[0029] The first conveyor 3 connects the waste pit 2 and the fermentation dryer 4. The first conveyor 3 moves the waste from the waste pit 2 to the fermentation dryer 4 without manual operation. The first conveyor 3 is, for example, a screw-type conveyor. The second conveyor 5 connects the fermentation dryer 4 and the storage hopper 6. The second conveyor 5 moves the fermented dried product from the fermentation dryer 4 to the storage hopper 6 without manual operation. The second conveyor 5 is a screw-type conveyor similarly to the first conveyor 3. The waste moved on the first conveyor 3 is before being fermented and dried, and thus contains many hard and large pieces. In order to prevent the first conveyor 3 from being jammed, for example, the screw diameter of the first conveyor 3 is made larger than the screw diameter of the second conveyor 5. The first conveyor 3 and the second conveyor 5 are driven, thereby continuously performing production of the fermented dried product from the waste in the waste pit 2 and storage of the fermented dried product in the storage hopper 6.

[0030] The waste incineration facility 1 includes a boiler 17, an air preheater 8, an air heater 9, a cooling tower 10, a bug filter 11, an induced draft fan 12, and a chimney 13, downstream of the incinerator 7. The boiler 17 is connected to the secondary combustion chamber 78 of the incinerator 7. The boiler 17 recovers heat of exhaust gas generated by combustion of the fermented dried product in the primary combustion chamber 77 and the secondary combustion chamber 78 of the incinerator 7. The boiler 17 includes a water drum 17a, a steam drum 17b, and multiple water pipes 17c connecting the water drum 17a and the steam drum 17b. The steam drum 17b of the boiler 17 and the fermentation dryer 4 are connected to each other by a steam supply path R. Steam generated in the boiler 17 is supplied to the fermentation dryer 4 through the steam supply path R.

[0031] The boiler 17 and the air preheater 8 are connected to each other by a first connection flow path 16a. The air heater 9 and the cooling tower 10 are connected to each other by a second connection flow path 16b. The cooling tower 10 and the bug filter 11 are connected to each other by a third connection flow path 16c. The bug filter 11 and the induced draft fan 12 are connected to each other by a fourth connection flow path 16d. The induced draft fan 12 and the chimney 13 are connected to each other by a fifth connection flow path 16e. Exhaust gas generated in the secondary combustion chamber 78 of the incinerator 7 passes through the boiler 17, air preheater 8, air heater 9, cooling tower 10, bug filter 11, and induced draft fan 12 in this order, and is exhausted from the chimney 13.

[0032] FIG. 2 is a schematic diagram of a fermentation dryer 4 and its surroundings according to the first embodiment. As shown in FIG. 2, the fermentation dryer 4 includes a sealed container 41, an agitator 42, a heating jacket 43, a condenser 44, a charge pipe 45, and a discharge pipe 46. The sealed container 41 is formed airtight to keep the inside at atmospheric pressure or less. The sealed container 41 includes a cylindrical peripheral wall 41d and a pair of end walls 41e, 41e that close the open ends of the peripheral wall 41d. A storage 41c for storing the waste is formed inside the sealed container 41. A waste inlet 41a is provided in an upper portion of one end of the peripheral wall 41d in the longitudinal direction. A charge pipe 45 is attached to the waste inlet 41a. A communication pipe 47 is attached to an upper portion of the other end of the peripheral wall 41d in the longitudinal direction. One of the pair of end walls 41e, 41e is provided with an outlet 41b for discharging the fermented dried product produced from the waste.

[0033] The agitator 42 is provided for agitating the waste in the storage 41c. The agitator 42 includes an agitator shaft 42a, multiple agitator blades 42b, and an electric motor 42c. Both ends of the agitator shaft 42a are supported by the pair of end walls 41e, 41e. The agitator blades 42b are attached to the agitator shaft 42a at predetermined intervals in the axial direction of the agitator shaft 42a so as to extend radially from the agitator shaft 42a. The electric motor 42c rotates the agitator shaft 42a.

[0034] A heating jacket 43 is provided to surround the peripheral wall 41d of the sealed container 41. The heating jacket 43 is provided for heating the storage 41c. Heating steam is supplied from the boiler 17 to the heating jacket 43 through the steam supply path R. The heating steam supplied to the heating jacket 43 is condensed by heat exchange to become condensed water. The condensed water is returned to the boiler 17 through a return pipe connected to the heating jacket 43.

[0035] The condenser 44 is provided for condensing steam generated from the waste heated in the storage 41c of the sealed container 41. The condenser 44 includes: a condensing casing 44a; and a guide pipe 44e connected to the condensing casing 44a. The condensing casing 44a is provided to be adjacent to the sealed container 41 and extend along the longitudinal direction of the sealed container 41. The end of the guide pipe 44e is connected to the end of the communication pipe 47 by a connection portion 48. A pair of heads 44b, 44b and multiple cooling pipes 44c supported by the pair of heads 44b, 44b are provided inside the condensing casing 44a. The cooling pipes 44c are connected to a cooling tower 18 by a cooling water flow path 19.

[0036] The cooling tower 18 includes a basin 18a, a pump 18b, a nozzle 18c, a downflow portion 18d, and a fan 18e. The cooling water discharged from the condenser 44 flows into the basin 18a. The pump 18b pumps up the cooling water from the basin 18a. The nozzle 18c sprays the pumped cooling water toward the downflow portion 18d. The fan 18e blows air toward the downflow portion 18d while the cooling water flows down in the downflow portion 18d. The temperature of the cooling water is lowered by the air blowing from the fan 18e. The cooling water flows down through the downflow portion 18d, and then flows into the basin 18a again. The cooling water cooled by the cooling tower 18 is sent to the condenser 44 by a cooling water pump 19a through the cooling water flow path 19. The cooling water circulates between the condenser 44 and the cooling tower 18 through the cooling water flow path 19.

[0037] The condensed water, which is obtained by condensing steam generated from the heated waste in the condenser 44, is also supplied to the cooling tower 18. In this embodiment, a vacuum pump 49 is connected to the condensing casing 44a of the condenser 44 via a suction pipe 44d. The vacuum pump 49 reduces the pressure of the storage 41c of the sealed container 41, and guides the condensed water staying in the condensing casing 44a and the suction pipe 44d to the basin 18a of the cooling tower 18.

[0038] The waste charged from the waste inlet 41a of the sealed container 41 is agitated by rotating the agitator blades 42b of the agitator 42 while being heated by the heating jacket 43. After the elapse of a predetermined time, the produced fermented dried product is discharged from an outlet 41b.

[0039] The fermentation dryer 4 includes: a charge pipe 45 connecting the downstream end of the first conveyor 3 and the waste inlet 41a of the sealed container 41; and a discharge pipe 46 connecting the outlet 41b of the sealed container 41 and the upstream end of the second conveyor 5. The charge pipe 45 is disposed to extend linearly in the vertical direction. The charge pipe 45 is provided with a first charge valve 45a, a second charge valve 45b located below the first charge valve 45a, and a charge-side temporary reservoir 45c. The first charge valve 45a and the second charge valve 45b are each a gate valve having a plate-shaped valve body. The charge-side temporary reservoir 45c is provided between the first charge valve 45a and the second charge valve 45b. The charge-side temporary reservoir 45c is provided to temporarily store the waste sent by the first conveyor 3.

[0040] The first charge valve 45a and the second charge valve 45b are controlled by a valve controller 24. When the waste is temporarily stored in the charge-side temporary reservoir 45c, the first charge valve 45a is fully opened, and the second charge valve 45b is fully closed. When the waste in the charge-side temporary reservoir 45c is charged into the storage 41c of the sealed container 41, the first charge valve 45a is fully closed, and the second charge valve 45b is fully opened, whereby the waste moves down to the storage 41c by gravity fall. That is, the first charge valve 45a and the second charge valve 45b are controlled so as not to be opened at the same time. The waste is charged into the storage 41c based on the control of the valve controller 24 to open only one of the first charge valve 45a or the second charge valve 45b. Thus, during the operation of the fermentation dryer 4, when the waste is continuously fed from the waste pit 2 to the storage 41c of the sealed container 41 by the first conveyor 3, the reduced pressure state of the storage 41c can be maintained.

[0041] The discharge pipe 46 is disposed so as to extend obliquely downward toward the second conveyor 5. The discharge pipe 46 is provided with a first discharge valve 46a, a second discharge valve 46b located closer to the second conveyor 5 than the first discharge valve 46a, and a discharge-side temporary reservoir 46c. The first discharge valve 46a and the second discharge valve 46b are each, for example, a gate valve having a plate-shaped valve body. The discharge-side temporary reservoir 46c is provided between the first discharge valve 46a and the second discharge valve 46b. The discharge-side temporary reservoir 46c is provided to temporarily store the fermented dried product discharged from the outlet 41b of the sealed container 41. The agitator blades 42b, rotated by the agitator shaft 42a of the agitator 42, push the fermented dried product in the storage 41c out through the outlet 41b, thereby moving the fermented dried product from the outlet 41b to the discharge-side temporary reservoir 46c.

[0042] The first discharge valve 46a and the second discharge valve 46b are controlled by the valve controller 24. When the fermented dried product is temporarily stored in the discharge-side temporary reservoir 46c, the first discharge valve 46a is fully opened, and the second discharge valve 46b is fully closed. When the fermented dried product in the discharge-side temporary reservoir 46c is fed to the second conveyor 5, the first discharge valve 46a is fully closed, and the second discharge valve 46b is fully opened, whereby the fermented dried product moves down to the upstream end of the second conveyor 5 by gravity fall. That is, the first discharge valve 46a and the second discharge valve 46b are controlled so as not to be opened at the same time. The fermented dried product is discharged from the storage 41c based on the control by the valve controller 24 such that only one of the first discharge valve 46a or the second discharge valve 46b is opened. Thus, during the operation of the fermentation dryer 4, when the fermented dried product is continuously fed from the storage 41c of the sealed container 41 to the storage hopper 6 by the second conveyor 5, the reduced pressure state of the storage 41c can be maintained.

[0043] FIG. 3 is a schematic diagram mainly showing the boiler 17 according to the first embodiment and the flow of the steam generated in the boiler 17. In FIG. 3, the chain double-dashed arrows each indicate the flow of steam or water. In FIG. 3, the dashed arrow indicates the flow of electricity. As illustrated in FIG. 3, the waste incineration facility 1 includes a steam control device 21 for controlling the amount of steam generated in the boiler 17 having the above-described structure and the amount of steam supplied to the heating jacket 43 of the fermentation dryer 4. The steam control device 21 is provided in an intermediate portion of the steam supply path R. The steam control device 21 performs control such that part of the steam supplied through the upstream portion of the steam supply path R is supplied to the heating jacket 43 of the fermentation dryer 4 through the downstream portion of the steam supply path R to heat the sealed container 41. The steam control device 21 causes another part of the supplied steam to be supplied to the steam-powered generator 22. The electric power generated by the steam-powered generator 22 is utilized to drive the electric motor 42c of the agitator 42.

[0044] FIG. 4 is a block diagram showing connection of an integrated control device 23 and the steam control device 21 of the waste incineration facility 1 according to the first embodiment to each part to be controlled. The integrated control device 23 is provided to control the entire facility from when the waste stored in the waste pit 2 is converted into a fermented dried product in the fermentation dryer 4 until it is incinerated in the incinerator 7. As illustrated in FIG. 4, the integrated control device 23 is electrically connected to the steam control device 21, the valve controller 24, the first conveyor 3, the second conveyor 5, the storage hopper charge door 6a, the primary air supply device 14, and the secondary air supply device 15.

[0045] The steam control device 21 performs control related to generation and supply of steam in cooperation with the integrated control device 23. The steam control device 21 includes a conveyer speed adjuster 21a, a supply air amount adjuster 21b, a furnace charge amount adjuster 21c, and a stoker speed adjuster 21d. The conveyer speed adjuster 21a adjusts the conveyance speeds of the first conveyor 3 and the second conveyor 5. When the conveyance speed of the first conveyor 3 is increased by the conveyer speed adjuster 21a, the charge amount of the waste into the storage 41c of the sealed container 41 of the fermentation dryer 4 per unit time can be increased. Further, when the conveyance speed of the second conveyor 5 is increased by the conveyer speed adjuster 21a, the supply amount of the fermented dried product to the storage hopper 6 per unit time can be increased.

[0046] The supply air amount adjuster 21b is provided to adjust the supply air amounts of the primary air supply device 14 and the secondary air supply device 15. The furnace charge amount adjuster 21c is provided to adjust the charge amount of the fermented dried product from the storage hopper 6 to the primary combustion chamber 77 of the incinerator 7. The stoker speed adjuster 21d is provided to adjust the conveyance speeds of the combustion stoker 72 and the post-combustion stoker 73.

[0047] The steam control device 21 is electrically connected to a steam pressure sensor 21e, a steam flowmeter 21f (flow rate measurement sensor), a furnace temperature sensor 21g, and a furnace pressure sensor 21h. The steam pressure sensor 21e and the steam flowmeter 21f are provided in, for example, the steam supply path R between the steam port of the steam drum 17b of the boiler 17 and the steam control device 21. The steam pressure sensor 21e measures the pressure of the steam generated in the steam drum 17b. The steam flowmeter 21f measures the flow rate of the steam passing through the steam supply path R. The furnace temperature sensor 21g is attached to a point at which the temperatures of the primary combustion chamber 77 and the secondary combustion chamber 78 are measurable. The furnace pressure sensor 21h is attached to a point at which the pressures of the primary combustion chamber 77 and the secondary combustion chamber 78 are measurable.

[0048] The steam control device 21 monitors the pressure and the flow rate of the steam supplied from the steam port of the steam drum 17b of the boiler 17, using the steam pressure sensor 21e and the steam flowmeter 21f. The steam control device 21 monitors the temperatures and the pressures of the primary combustion chamber 77 and the secondary combustion chamber 78 of the incinerator 7, using the furnace temperature sensor 21g and the furnace pressure sensor 21h. The conveyer speed adjuster 21a adjusts the conveyance speeds of the first conveyor 3 and the second conveyor 5 based on the output signals from the above-described sensors in cooperation with the integrated control device 23. The supply air amount adjuster 21b adjusts the supply air amounts of the primary air supply device 14 and the secondary air supply device 15 based on the output signals of the sensors in cooperation with the integrated control device 23. The furnace charge amount adjuster 21c opens and closes the storage hopper charge door 6a of the storage hopper 6 based on the output signals from the sensors in cooperation with the integrated control device 23. The stoker speed adjuster 21d adjusts the conveyance speeds of the combustion stoker 72 and the post-combustion stoker 73 based on the output signals from the sensors in cooperation with the integrated control device 23.

[0049] The steam control device 21 sends a control signal to the valve controller 24 via the integrated control device 23 based on the output signal from the sensors. Based on the control signal, the valve controller 24 controls the timing of opening and closing the first charge valve 45a, the second charge valve 45b, the first discharge valve 46a, and the second discharge valve 46b.

[0050] The integrated control device 23 and the steam control device 21 operate to control the steam amounts supplied to the heating jacket 43 and the steam-powered generator 22 to be optimal.

[0051] FIG. 5 is an overall schematic diagram of a waste incineration facility 100 according to a second embodiment of the present invention. The same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Unlike the waste incineration facility 1 including a stoker-type incinerator 7 of the first embodiment, this waste incineration facility 100 is an example in which the fermentation dryer 4 and the like are applied to a fluidized bed incinerator 25. As illustrated in FIG. 5, the waste incineration facility 100 includes the fluidized bed incinerator 25, an air heater 26, a combustion air supply device 27, a cooling tower 28, a dust collector 29, a gas scrubber 31, an induced draft fan 32, a chimney 33, and the like. The incinerator 25 includes a combustion chamber 25a. A fluidized bed 25b made of a fluidizing medium such as silica sand is provided at the lower portion of the combustion chamber 25a. The waste in the waste pit 2 is converted into the fermented dried product in the fermentation dryer 4, and is then stored in the storage hopper 6. The fermented dried product is charged into the combustion chamber 25a of the incinerator 25 through the storage hopper charge door 6a of the storage hopper 6. In the combustion chamber 25a of the incinerator 25, the fermented dried product is combusted while being mixed and agitated with the fluidizing medium, which is fluidized by combustion air. The heat of the high-temperature exhaust gas generated in the combustion chamber 25a is recovered by the boiler 17 and the air heater 26, cooled by the cooling tower 28, passed through the dust collector 29 and the gas scrubber 31 to produce clean gas, and then discharged into the atmosphere from the chimney 33 through the induced draft fan 32.

[0052] As described above, the waste incineration facility 1, 100 according to the above embodiment includes a waste pit 2 for receiving waste and an incinerator 7, 25 for incinerating the waste stored in the waste pit 2. The waste incineration facility 1, 100 further includes a fermentation dryer 4 configured to ferment and dry the waste while heating the waste to a predetermined temperature range under reduced pressure and a storage hopper 6 for storing a fermented dried product produced in the fermentation dryer 4. The fermented dried product stored in the storage hopper 6 is charged into the incinerator 7, 25 to incinerate the fermented dried product.

[0053] With such a configuration, before the waste is charged into the incinerator 7, 25, the waste can be fermented and dried by the fermentation dryer 4, and the fermented dried product from which moisture has been sufficiently removed can be produced. Further, after the fermented dried product is temporarily stored into the storage hopper 6, the fermented dried product can be charged into the incinerator 7, 25. Even if the moisture content of the waste before being treated by the fermentation dryer 4 is uneven, the moisture content of the fermented dried product can be made substantially uniform. The fermented dried product is combusted in the incinerator 7, 25. This prevents the incinerator 7, 25 from losing a larger amount of heat even if the original waste contains a large amount of moisture, thus preventing uneven temperature in the incinerator 7, 25. Accordingly, it is possible to stably combust the waste in the incinerator 7, 25 and perform incineration.

[0054] In the fermentation dryer 4, the fermentation is carried out while heating under reduced pressure. It is thus possible to lower the boiling point to accelerate the evaporation of moisture, and at the same time to evaporate moisture at a temperature at which microorganisms for fermentation are activated. This accelerates fermentation and drying in the fermentation dryer 4 compared to the case where the pressure is not reduced, thereby allowing the fermented dried product to be produced in a short time even when the moisture content in the original waste is high. Therefore, the process from the reception of the waste to the incineration can be efficiently performed. In the fermentation dryer 4, microorganisms ferment and decompose the waste, and thus, in the resulting fermented dried product, the odor of the waste is decomposed. Thus, the waste received in the waste pit 2 is treated by the fermentation dryer 4 to produce the fermented dried product, and the fermented dried product is stored in the storage hopper 6, whereby the malodor in the waste incineration facility 1, 100 is reduced, and the working environment of the worker can be improved.

[0055] The waste incineration facility 1, 100 according to the above embodiment further includes a first conveyor 3 connecting the waste pit 2 and the fermentation dryer 4 and a second conveyor 5 connecting the fermentation dryer 4 and the storage hopper 6. In the above embodiment, the first conveyor 3 and the second conveyor 5 are driven to continuously perform production of the fermented dried product from the waste in the waste pit 2 and storage of the fermented dried product in the storage hopper 6.

[0056] With such a configuration, the waste and the fermented dried product can be moved automatically by the first conveyor 3 and the second conveyor 5.

[0057] The waste incineration facility 1, 100 according to the above embodiment further includes a boiler 17 configured to recover heat of exhaust gas generated by combustion of the fermented dried product in a combustion chamber 77, 78, 25a of the incinerator 7, 25. The boiler 17 and the fermentation dryer 4 are connected to each other by the steam supply path R, and the steam generated in the boiler 17 is supplied to the fermentation dryer 4 through the steam supply path R and used to heat the waste.

[0058] With such a configuration, heat of the exhaust gas generated in the incineration of the fermented dried product in the combustion chamber 77, 78, 25a of the incinerator 7, 25 can be effectively utilized to heat the waste in the fermentation dryer 4. Since no additional fuel is required for heating the waste in the fermentation dryer 4, the waste incineration facility 1, 100 is economical.

[0059] In the waste incineration facility 1, 100 according to the above embodiment, the fermentation dryer 4 includes: a sealed container 41 having a storage 41c for storing the waste, a waste inlet 41a, and an outlet 41b; a charge pipe 45 connecting a downstream end of the first conveyor 3 and the waste inlet 41a; and a discharge pipe 46 connecting the outlet 41b and an upstream end of the second conveyor 5. The charge pipe 45 is provided with the first charge valve 45a, the second charge valve 45b, and the charge-side temporary reservoir 45c. The discharge pipe 46 is provided with the first discharge valve 46a, the second discharge valve 46b, and the discharge-side temporary reservoir 46c. The first charge valve 45a, the second charge valve 45b, the first discharge valve 46a, and the second discharge valve 46b are controlled by the valve controller 24. The waste is charged into the storage 41c based on the control of the valve controller 24 to open only one of the first charge valve 45a or the second charge valve 45b. The fermented dried product is discharged from the storage 41c based on the control by the valve controller 24 such that only one of the first discharge valve 46a or the second discharge valve 46b is opened.

[0060] With such a configuration, during the operation of the fermentation dryer 4, the charging of the waste into the storage 41c of the sealed container 41 and the discharging of the fermented dried product from the storage 41c can be continuously performed while maintaining the reduced pressure state of the storage 41c. Thus, the storing of the fermented dried product in the storage hopper 6 and the charging of the fermented dried product into the incinerator 7, 25 are smoothly performed, and the fermented dried product can be stably combusted in the incinerator 7, 25.

[0061] Further, the waste incineration facility 1, 100 according to the above embodiment further includes a steam control device 21 configured to control the amount of steam supplied to the fermentation dryer 4. The steam control device 21 includes: a conveyer speed adjuster 21a configured to adjust conveyance speeds of the first conveyor 3 and the second conveyor 5; and a furnace charge amount adjuster 21c configured to adjust a charge amount of the fermented dried product from the storage hopper 6 into incinerator 7, 25.

[0062] With such a configuration, the steam control device 21 adjusts the conveyance speeds of the first conveyor 3 and the second conveyor 5 by the conveyer speed adjuster 21a, so that the amount of fermented dried product produced in the fermentation dryer 4 and the amount of fermented dried product fed to the storage hopper 6 are adjusted. The steam control device 21 adjusts the amount of the fermented dried product charged into the combustion chamber 77, 25a of the incinerator 7, 25 from the storage hopper 6 by the furnace charge amount adjuster 21c, to adjust the temperature and the flow rate of exhaust gas generated in the combustion chamber 77, 78, 25a, thereby adjusting the amount of steam generated in the boiler 17. When the amount of steam generated in the boiler 17 is adjusted, the waste can be efficiently heated in the fermentation dryer 4. This makes it possible to perform the production of the fermented dried product in the fermentation dryer 4 and the incineration of the fermented dried product in the incinerator 7, 25 in a well-balanced manner.

[0063] The disclosed embodiments are illustrative in all respects and do not serve as a basis for restrictive interpretation. The scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the claims. The scope of the present invention includes all modifications within the meaning and scope equivalent to the scope of the claims.

[0064] For example, in the above embodiments, two charge valves 45a, 45b are provided in the charge pipe 45, and two discharge valves 46a, 46b are provided in the discharge pipe 46. The present invention is not limited to this example, and the facility may have a single charge valve and a single discharge valve.

[0065] In the above embodiments, the steam control device 21 and the valve controller 24 are configured separately from the integrated control device 23 configured to control the entire facility, but may be integrated into a single control device to perform the control.

[0066] Further, multiple fermentation dryers 4 according to the above embodiment may be provided in parallel so as to appropriately convert the waste into the fermented dried product according to the scale of the waste incineration facility. In the above embodiments, the first conveyor 3 and the second conveyor 5 are each formed as a screw-type conveyer, but may be a conveyer of another type.

INDUSTRIAL APPLICABILITY

[0067] The present invention is applicable to a waste incineration facility including a waste pit for receiving waste and an incinerator for incinerating the waste stored in the waste pit.

DESCRIPTION OF REFERENCE CHARACTERS

[0068] 1 Waste Incineration Facility [0069] 2 Waste Pit [0070] 3 First Conveyor [0071] 4 Fermentation Dryer [0072] 5 Second Conveyor [0073] 6 Storage Hopper [0074] 7 Incinerator [0075] 17 Boiler [0076] 21 Steam Control Device [0077] 21a Conveyor Speed Adjuster [0078] 21c Furnace Charge Amount Adjuster [0079] 41 Sealed Container [0080] 41a Waste Inlet [0081] 41b Outlet [0082] 41c Storage [0083] 45 Charge Pipe [0084] 45a First Charge Valve [0085] 45b Second Charge Valve [0086] 45c Charge-Side Temporary Reservoir [0087] 46 Discharge Pipe [0088] 46a First Discharge Valve [0089] 46b Second Discharge Valve [0090] 46c Discharge-Side Temporary Reservoir [0091] 77 Primary Combustion Chamber [0092] 78 Secondary Combustion Chamber [0093] R Steam Supply Path