EP4303487A1 - Solid fuel combustion device - Google Patents
Solid fuel combustion device Download PDFInfo
- Publication number
- EP4303487A1 EP4303487A1 EP21928970.9A EP21928970A EP4303487A1 EP 4303487 A1 EP4303487 A1 EP 4303487A1 EP 21928970 A EP21928970 A EP 21928970A EP 4303487 A1 EP4303487 A1 EP 4303487A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- combustion
- solid fuels
- turntable
- solid
- combustion chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 237
- 239000004449 solid propellant Substances 0.000 title claims abstract description 161
- 239000000779 smoke Substances 0.000 claims description 37
- 239000000428 dust Substances 0.000 claims description 22
- 239000000446 fuel Substances 0.000 claims description 18
- 238000003384 imaging method Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 2
- 239000002956 ash Substances 0.000 description 29
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 14
- 238000010586 diagram Methods 0.000 description 13
- 238000007599 discharging Methods 0.000 description 12
- 239000004033 plastic Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000001354 calcination Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000010849 combustible waste Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000003685 thermal hair damage Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
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- 230000008021 deposition Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/24—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a vertical, substantially cylindrical, combustion chamber
- F23G5/26—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a vertical, substantially cylindrical, combustion chamber having rotating bottom
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B30/00—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber
- F23B30/02—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/06—Mechanically-operated devices, e.g. clinker pushers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
- F23N1/10—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught
- F23N1/102—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2203/00—Furnace arrangements
- F23G2203/80—Furnaces with other means for moving the waste through the combustion zone
- F23G2203/805—Furnaces with other means for moving the waste through the combustion zone using a rotating hearth
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2205/00—Waste feed arrangements
- F23G2205/12—Waste feed arrangements using conveyors
- F23G2205/121—Screw conveyor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2229/00—Flame sensors
- F23N2229/20—Camera viewing
Definitions
- This invention relates to a solid fuel combustion apparatus. More specifically, the present invention relates to a solid fuel combustion apparatus that burns combustible solid wastes as fuels to obtain heat.
- Solid combustible wastes such as resins (plastics) have been used as raw materials for refuse derived paper and plastics densified fuel (RPF). Even wastes can be easily burned in the calciner to obtain the same level of heat as that of the existing coke and other materials. In addition, since the wastes are treated as solid fuels, the entire volume of emissions of carbon dioxide is expected to be reduced in comparison to a case where fuels such as heavy oil or natural gas are newly burned.
- the applicant has completed a novel solid fuel combustion apparatus by obtaining an effective configuration for feeding solid fuels avoiding heat exposure during calcination, ensuring the movement of solid fuels inside the calciner, and removing calcined ashes after diligent study.
- An object of the present invention is to provide a solid fuel combustion apparatus that uses combustible solid wastes such as resin (plastic) as solid fuels, avoids damage to portions related to the feed of the solid fuels due to heat exposure during calcining, and ensures excellent movement of the solid fuels inside the combustion apparatus.
- combustible solid wastes such as resin (plastic) as solid fuels
- a solid fuel combustion apparatus in which a plurality of solid fuels are fed to a combustion unit to obtain combustion heat through combustion is provided.
- the combustion unit includes a first combustion chamber that burns solid fuels; a feeder that feeds the solid fuels to the first combustion chamber; a turntable that forms a lower surface portion of the first combustion chamber and turns the solid fuels fed from the feeder on the lower surface portion of the turntable, and an agitator that agitates the solid fuels accumulated on the turntable.
- first combustion chamber may be cylindrical in shape and the feeder may feed the solid fuels to the circumferential edge of the turntable.
- a hole may be formed in the turntable, into which hole combustion ash of the solid fuels falls, and a combustion ash discharger may be provided below the turntable.
- a dust collector may be provided in a lower portion of the turntable, and the dust collector may be used to stir up the combustion ash that falls from the turntable.
- a second combustion chamber may be provided above the first combustion chamber for the flame generated by the combustion of the solid fuels to rise.
- an air feeder that feeds air for combustion of the solid fuels may be provided in the second combustion chamber.
- the agitator may include an agitating impeller or an elongate plate object to move the solid fuels accumulated on the turntable to a vicinity of the center of the turntable.
- the solid fuel combustion apparatus may further include: a combustion smoke imaging unit that images combustion smoke generated at a time of combustion of the solid fuels; and a fuel quantity controller that controls quantity of the solid fuels fed from the feeder to the first combustion chamber.
- the fuel quantity controller may control quantity of solid fuels fed from the feeder to the first combustion chamber by determining quantity of the burned solid fuels on the basis of a color of the combustion smoke imaged by the combustion smoke imaging unit.
- the solid fuel combustion apparatus may further include: a combustion smoke imaging unit that images combustion smoke generated at a time of combustion of the solid fuels; and an air volume controller that controls a volume of air fed from the air feeder to the second combustion chamber.
- the air volume controller may control the volume of air fed from the air feeder to the second combustion chamber by determining quantity of the burned solid fuels on the basis of a color of the combustion smoke imaged by the combustion smoke imaging unit.
- the combustion unit includes a first combustion chamber that burns solid fuels; a feeder that feeds the solid fuels to the first combustion chamber; a turntable that forms a lower surface portion of the first combustion chamber and turns the solid fuels fed from the feeder on the lower surface portion of the turntable, and an agitator that agitates the solid fuels accumulated on the turntable, thereby avoiding damage to portions related to the feed of the solid fuels configured by combustible solid wastes due to heat exposure during calcining.
- the solid fuel combustion apparatus uses combustible materials called RPF (refuse derived paper and plastics densified fuel) obtained by compressing solid combustible wastes such as resin (plastic) and paper as solid fuels.
- RPF heat derived paper and plastics densified fuel
- the solid fuels are fed into and burned in the combustion apparatus, generating combustion heat.
- combustible gases are generated from the solid fuels.
- the combustible gases are then ignited to produce a flame, which is recovered as heat of combustion.
- the combustion heat generated may be supplied to heat exchangers for steam generation in boilers, for example, and the combustion heat itself may be used for heating, drying, and room heating, for example.
- the solid fuel combustion apparatus is configured to obtain combustion heat from RPF solid fuels.
- the combustion efficiency of RPF solid fuels is high since they are made mainly from resins (plastics) and paper as waste materials.
- the solid fuel combustion apparatus according to the embodiment is capable of processing combustible wastes. Accordingly, a reduction in a volume of emissions of carbon dioxide is more expected when heat is generated in comparison to a case where fuels such as heavy oil, and natural gas, for example, are newly burned. Obviously, a number of solid fuels are fed into the combustion apparatus. Accordingly, even if a solid fuel is simply referred to, it corresponds to multiple (multiple pieces, multiple quantities) of solid fuels.
- FIG. 1 is an overall side schematic diagram illustrating a solid fuel combustion apparatus according to an embodiment of the present disclosure.
- the solid fuel combustion apparatus 1 includes a first combustion chamber 11 as a main portion of a combustion unit 10 and into which solid fuels are brought and burned.
- a second combustion chamber 52, third combustion chamber 53, and connecting chamber 51 are provided immediately above the first combustion chamber 11 in this order.
- the second and third combustion chambers 52 and 53 correspond to spaces for amplifying the flame produced by the combustion of solid fuels in the first combustion chamber 11 to increase the heat of combustion.
- the first combustion chamber 11, the second combustion chamber 52, and the third combustion chamber 53 are all cylindrical in shape. This is because it is convenient for the heat flow to rise while swirling as described below.
- the connecting chamber 51 corresponds to a space for connecting the generated combustion heat to a heat exchanger of a boiler or heat transfer piping (both not shown).
- the third combustion chamber 53 may be omitted depending on the size of the solid fuel combustion apparatus 1 itself.
- the combustion unit 10 mainly includes the first combustion chamber 11 that burns the solid fuels fed therein, a feeder 12 that feeds solid fuels to the first combustion chamber 11, a turntable 20 that forms and turns a lower surface portion 17 of the first combustion chamber 11, and an agitator 30 that agitates the solid fuels fed thereto.
- the turntable 20 includes a hole 22 (see FIG. 5 ) into which the calcined ashes of the solid fuels fall.
- a dust collecting chamber 18 is formed below the turntable 20 provided at the lower surface portion 17 of the first combustion chamber 11.
- a calcined ash discharger 42 is provided in the dust collecting chamber 18 below the turntable 20.
- the calcined ashes that fall into the dust collecting chamber 18 are conveyed by the calcined ash discharger 42 to the calcined ash collecting box 45.
- legs 19 support the dust collecting chamber 18 and the first combustion chamber 11 as well as configurations thereabove.
- the turntable 20 is connected to a turntable shaft portion 26 and driven by a turning motor M4.
- the calcined ash discharger 42 is driven by a discharging motor M3.
- the feeder 12 includes a feeding rotary shaft 13 and a feeding impeller 14 mounted on the feeding rotary shaft 13 in a spiral manner.
- the feeding impeller 14 corresponds to a spiral propeller, referred to as Archimedes screw, or Archimedes spiral, for example.
- the feeding rotary shaft 13 and feeding impeller 14 are rotated by the feeding motor M1.
- RPF as solid fuels is fed through the feeding port 15 (hopper) into the feeder 12.
- the solid fuels move from the position of the feeding port 15 through the feeding impeller 14 to the tip end of the feeder 12, and fall from the tip end of the feeder 12 into the interior of the first combustion chamber 11.
- the tip end of the feeder 12 does not enter deeply into the first combustion chamber 11, but stays approximately at the inner wall surface. Accordingly, the tip end of the feeder 12 is located immediately above the circumferential edge 21 of the turntable 20. The fact that the tip end of the feeder 12 does not enter deeply into the first combustion chamber 11 allows the feeder 12 (feeding rotary shaft 13 and feeding impeller 14) to be less prone to thermal damage, thereby reducing the frequency of replacement of the portions in the combustion apparatus 1.
- the turntable 20 shown in FIG. 2 may be disassembled for replacement. Specifically, the linear portion shown in the turntable 20 indicates a portion to be detached.
- the solid fuel combustion apparatus 1 includes the agitator 30.
- the agitator 30 includes an agitating rotary shaft 31 and an agitating impeller 32 mounted on the agitating rotary shaft 31 in a spiral manner.
- the agitating impeller 32 corresponds to a spiral propeller, referred to as Archimedes screw, or Archimedes spiral, for example.
- the agitating rotary shaft 31 and the agitating impeller 32 are rotated by the agitating motor M2.
- the solid fuels R are fed from the feeder 12, the solid fuels R accumulate unevenly on a portion of the lower surface portion 17 of the first combustion chamber 11. Even if the turntable 20 turns, they are still deposited on the circumferential edge 21 of the turntable 20. Accordingly, the solid fuels R accumulated at the circumferential edge 21 of the turntable 20 are moved to the vicinity of the center of the turntable 20 through the agitating impeller 32 of the agitator 30.
- FIG. 1 illustrates that portions of the agitating impeller 32 of the agitator 30 are provided at a slight distance upward from the turntable 20 located on the lower surface portion 17 of the first combustion chamber 11.
- FIG. 2 illustrates that the agitating impeller 32 of the agitator 30 extends from the circumferential edge 21 of the turntable 20 toward the center of the turntable 20.
- the solid fuels R scraped by the agitating impeller 32 of the agitator 30 are moved from the circumferential edge 21 of the turntable 20 to the vicinity of the center. Simultaneously, the turntable 20 itself is turning at the lower surface portion 17 of the first combustion chamber 11.
- the position of the agitator 30 advances in the direction of the center of the turntable 20 from the viewpoint of demonstrating the performance of agitating.
- the agitating rotary shaft 31 and agitating impeller 32 of the agitator 30 are thermally exposed to the combustion heat (thermal power) of the solid fuels.
- the combustion heat of the solid fuels is not hot enough to damage the agitator 30 at a location in the vicinity of the circumferential edge 21 of the turntable 20. Rather, the upper portion of the first combustion chamber 11, and a portion even higher above it become hotter. Accordingly, the agitator 30 located in the vicinity of the turntable 20 is less effected from thermal damage caused by the combustion of the solid fuels.
- the agitator 30 allows for the movement of the solid fuels even during their combustion. Accordingly, the unburned solid fuels are moved on the turntable 20 by the agitator 30. The unburned solid fuels can then be fully burned at the moved location. This also clarifies that the agitator 30 contributes to improving the combustion efficiency of the solid fuels brought into the first combustion chamber 11.
- the solid fuels are moved to the vicinity of the center of the turntable 20 as described above.
- the agitator 30 may reverse the rotational direction of the agitating impeller 32 (reverse rotation).
- the burned ashes (clinker, for example) remaining on the turntable 20 from the solid fuels are scraped off and discharged from the combustion unit 10 (first combustion chamber 11).
- an elongate plate object (not shown) may be employed as a substitute for the agitating rotary shaft 31 and agitating impeller 32.
- an elongate rod object may be employed.
- the elongate plate object is inserted into the first combustion chamber 11 from the same position as that of the agitator 30 of the first combustion chamber 11. The position, angle, and length of insertion of the elongate plate object into the interior of the first combustion chamber 11 are suitably adjusted. Even by replacing the agitator 30 with the elongate plate object, the solid fuels are continually drawn from the circumferential edge 21 to the vicinity of the center of the turntable 20 through the rotation of the turntable 20.
- the dust collecting chamber 18 is formed below the lower surface portion 17 (turntable 20) of the first combustion chamber 11.
- the partial exploded view in FIG. 5 shows the turntable 20 roughly cut in half, with the lower half of FIG. 5 showing only the turntable 20, and the upper half showing the inside of the dust collecting chamber 18 immediately below the turntable 20.
- a considerable number of holes 22 are formed in the board surface of the turntable 20.
- the solid fuels R used correspond to an irregularly shaped mass of approximately 3 to 7 cm.
- the combustion residue from the burning of the solid fuels in the first combustion chamber 11 becomes calcined ashes As.
- the calcined ashes As then pass through the holes 22 and fall into the dust collecting chamber 18 immediately below the turntable 20.
- the shape of each hole 22 may be round, square, or even an elongate slit shape as appropriate.
- the arrangement of the holes 22 may be radial from the center of the turntable 20, arc-shaped, or other as appropriate.
- a dust collector 40 is connected to the turntable shaft portion 26 at a lower portion of the turntable 20 (see FIG. 5 ).
- the dust collector 40 corresponds to a plate member that contacts the bottom surface of the dust collecting chamber 18 and has a length corresponding to the radius of the inside bottom surface of the dust collecting chamber 18 (see FIGS. 1 , 3 , and 4 ).
- the calcined ashes As that fall into the dust collecting chamber 18 are stirred up across the entire bottom surface of the chamber 18 by the dust collector 40, which turns in conjunction with the turning of the turntable 20 (turntable shaft portion 26) by the turning motor M4.
- the collected calcined ashes As are then guided through the dust collecting opening 41 to the calcined ash discharger 42.
- the calcined ash discharger 42 includes a discharging impeller 43 mounted on a discharging rotary shaft 44 in a spiral manner.
- the discharging impeller 43 corresponds to a spiral propeller, referred to as Archimedes screw, or Archimedes spiral, for example.
- the discharging rotary shaft 44 and the discharging impeller 43 are rotated by the discharging motor M3.
- the calcined ashes As that fall from the dust collecting opening 41 and enter the calcined ash discharger 42 are efficiently dropped through a calcined ash discharging opening 46 into a calcined ash collecting box 45 by the discharging impeller 43.
- the turntable 20 is driven to turn at a rotational speed of one rotation per minute.
- the rotational speed is appropriate depending on the size of the device itself.
- the turntable 20 is driven to turn when the solid fuels are brought in and formed into a mountain shape on the turntable 20, and when the calcined ashes are removed after the combustion. If the bringing of the solid fuels to the first combustion chamber 11 is continuous, the turntable 20 is always driven to turn.
- the solid fuel combustion apparatus 1 includes a second combustion chamber 52 and a third combustion chamber 53 above the first combustion chamber 11.
- air is fed from the outside of the combustion apparatus 1 to increase its combustion efficiency.
- the second combustion chamber 52 includes an air feeder as shown in the plan view in FIG. 6 .
- a first air feeder 55 and a second air feeder 56 are provided. Air enters the second combustion chamber 52 from both the first air feeder 55 and the second air feeder 56. The wind pressure of the incoming air triggers a swirling flow of flame (flame vortex, or heat flow) inside the second combustion chamber 52, including the first combustion chamber 11, as shown by the arcuate arrow in FIG. 6 .
- the swirling flow of the flame generated by the combustion of the solid fuels (combustible gas) spreads to the first combustion chamber 11 and the second combustion chamber 52.
- the swirling flow of the flame indicated by the arcuate arrows then vertically rises through the first combustion chamber 11, the second combustion chamber 52, and the third combustion chamber 53.
- the flame grows from the solid fuels accumulated in the first combustion chamber 11 to a height where it reaches the second combustion chamber 52 and third combustion chamber 53, thereby creating a swirling flow of flame.
- the temperature on the upper side of the flame is high relative to the size of the rising flame. Therefore, to obtain more combustion heat from the solid fuels per weight, it is desirable that the second combustion chamber 52 be provided above the first combustion chamber 11, and even the third combustion chamber 53 be provided.
- the efficient combustion of the solid fuels in the solid fuel combustion apparatus 1 according to the embodiment is described.
- the mechanism of the control of the combustion conditions in the solid fuel combustion apparatus 1 according to the embodiment will now be described.
- the color of the combustion smoke black, white, or colorless, for example
- the solid fuel combustion apparatus 1 the color of the combustion smoke (black, white, or colorless, for example) generated when the solid fuels are burning is identified to determine whether the solid fuels are burning well (complete or incomplete combustion), thereby controlling the solid fuel feeding rate and air feeding rate.
- FIG. 8 is a block diagram illustrating a schematic configuration of the controller 100 implemented in the solid fuel combustion apparatus 1 according to the embodiment.
- the controller 100 is configured by a microcomputer or other hardware needed for receiving various signals, performing computations, storing, or controlling operations, for example, as well as a CPU 101, ROM 102, RAM 103, storage 104, and input/output interface (I/O) 105, for example.
- a CPU 101, ROM 102, RAM 103, storage 104, and input/output interface (I/O) 105 for example.
- the controller 100 When the functional units of the controller 100 (computer) in FIG. 8 are embodied by software, the controller 100 is embodied by executing the instructions of the program as software that embodies the functions.
- the recording medium for storing this program may include a "non-transient tangible medium” such as a CD, DVD, semiconductor memory, or programmable logic circuit.
- the program may also be supplied to the controller 100 of the solid fuel combustion apparatus 1 via any transmission medium capable of transmitting the program (communication network, and broadcast wave, for example).
- the storage 104 of the controller 100 may correspond to a known storage device such as an HDD or SSD.
- the storage 104 may be directed to an external server (not shown).
- the storage 104 stores various data, information, programs, and other data needed to execute the programs.
- the functional units that execute various computations, operations, and other arithmetic operations may correspond to the CPU 101 and other arithmetic elements, for example.
- input devices such as a keyboard, or mouse, for example (not shown), a display (a display or other display device not shown), output devices for outputting data, for example, may also be appropriately connected to theI/O 105of the controller 100.
- the combustion smoke imaging unit 110 may correspond to a publicly known CCD camera, and CMOS image sensor, for example.
- the color (black, white, or colorless, for example) of the combustion smoke K generated when the solid fuels are burning in the first combustion chamber 11 is imaged.
- the upper portion of the color of the combustion smoke is then transmitted to the controller 100.
- the fuel quantity controller corresponds to the feeding motor M1 of the agitator 30 in FIG. 8 .
- the quantity of the solid fuels fed from the agitator 30 to the first combustion chamber 11 is increased or decreased by controlling increasing and decreasing of the rotational speed of the feeding rotary shaft 13 and the feeding impeller 14 of the feeding motor M1.
- the air volume controller corresponds to the air feeder F in FIG. 8 .
- the air feeder F may correspond to a known blower, for example, which feeds air (oxygen) to the first air feeder 55 and the second air feeder 56 in the embodiment.
- the volume of air fed from the air feeder F to the second combustion chamber 52 is controlled to be increased or decreased to increase or decrease the volume of oxygen in the first combustion chamber 11.
- a combustion smoke imaging unit 110 feeding motor M1 (fuel quantity controller), and air feeder F (air volume controller) are connected to the I/O 105 and controlled by the CPU 101 in the controller 100.
- feeding motor M1 fuel quantity controller
- air feeder F air volume controller
- combustion smoke generated during the combustion of the solid fuels is imaged by a combustion smoke imaging unit 110 (step S101).
- the information on the imaged combustion smoke is transmitted to the controller 100 to determine the amount of combustion of the solid fuels. That is, a determination of a smoke color is performed as to whether the color of the combustion smoke corresponds to one of the colors (e.g., black, white, or colorless) of the smoke (step S102). For example, it is determined whether the color of the imaged combustion smoke is more black on the basis of a comparison between the color and a pre-defined reference color of the smoke color.
- the combustion state of the solid fuels may be determined to be generally complete.
- the current quantity of fed solid fuels and current volume of the fed air are maintained at the current level. Accordingly, the status quo is maintained for the feeding motor M1 (fuel quantity controller) and the air feeder F (air volume controller), and the process ends with no change.
- the combustion state of the solid fuels is likely to be incomplete combustion.
- the current quantity of the fed solid fuels and current volume of the fed air need to be changed to transition the state to the complete combustion.
- the process is completed as described above.
- the combustion smoke is then imaged again, the determination of the smoke color is performed, and the combustion state of the solid fuels is checked.
- the feeding motor M1 fuel quantity controller
- the air feeder F air volume controller
- the control to increase the quantity of solid fuels or to decrease the volume of air may be employed. Both the feeding motor M1 (fuel quantity controller) and the air feeder F (air volume controller) may be controlled simultaneously.
- control is also performed over either or both the feeding motor M1 (fuel quantity controller) or the air feeder F (air volume controller) via the controller 100.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Solid-Fuel Combustion (AREA)
Abstract
A solid fuel combustion apparatus in which a plurality of solid fuels are fed to a combustion unit to obtain combustion heat through combustion. The combustion unit includes a first combustion chamber that burns solid fuels; a feeder that feeds the solid fuels to the first combustion chamber; a turntable that forms a lower surface portion of the first combustion chamber and turns the solid fuels fed from the feeder on the lower surface portion of the turntable, and an agitator that agitates the solid fuels accumulated on the turntable.
Description
- This invention relates to a solid fuel combustion apparatus. More specifically, the present invention relates to a solid fuel combustion apparatus that burns combustible solid wastes as fuels to obtain heat.
- Solid combustible wastes such as resins (plastics) have been used as raw materials for refuse derived paper and plastics densified fuel (RPF). Even wastes can be easily burned in the calciner to obtain the same level of heat as that of the existing coke and other materials. In addition, since the wastes are treated as solid fuels, the entire volume of emissions of carbon dioxide is expected to be reduced in comparison to a case where fuels such as heavy oil or natural gas are newly burned.
- When solid fuels such as RPF are burned in a calciner, they have poor flowability in the apparatus (calciner), and calcined ashes are also produced after the solid fuels are calcined. This reduces the combustion efficiency of the solid fuels in the calciner (firing furnace) if the solid fuels are simply fed into the calciner. In addition, the calciner cannot be safely operated without adequate removal of calcined ashes.
- Accordingly, a calciner incorporating improvements related to the feed of solid fuels and removal of calcined ashes has been proposed (e.g.,
patent documents 1 and 2). However, according to the calciner described inpatent documents 1 and 2, the feed of solid fuels to the inside of the calciner and the removal of calcined ashes after firing of the solid fuels have been not always sufficient, and further improvement has been desired. In addition, as the mechanism of the calciner is complicated, the mechanism for feeding the solid fuels, for example, is exposed to heat during the calcining of the solid fuels in the calciner, thereby easily reducing the durability of the apparatus. Therefore, less progress has been made in improving the apparatus in the current calciner. -
- [Patent Document 1]
Japanese Laid-Open Patent Publication No. 2014-211255 - [Patent Document 2]
Japanese Laid-Open Patent Publication No. 2008-261527 - The applicant has completed a novel solid fuel combustion apparatus by obtaining an effective configuration for feeding solid fuels avoiding heat exposure during calcination, ensuring the movement of solid fuels inside the calciner, and removing calcined ashes after diligent study.
- An object of the present invention is to provide a solid fuel combustion apparatus that uses combustible solid wastes such as resin (plastic) as solid fuels, avoids damage to portions related to the feed of the solid fuels due to heat exposure during calcining, and ensures excellent movement of the solid fuels inside the combustion apparatus.
- A solid fuel combustion apparatus according to an embodiment in which a plurality of solid fuels are fed to a combustion unit to obtain combustion heat through combustion is provided. The combustion unit includes a first combustion chamber that burns solid fuels; a feeder that feeds the solid fuels to the first combustion chamber; a turntable that forms a lower surface portion of the first combustion chamber and turns the solid fuels fed from the feeder on the lower surface portion of the turntable, and an agitator that agitates the solid fuels accumulated on the turntable.
- Further, the first combustion chamber may be cylindrical in shape and the feeder may feed the solid fuels to the circumferential edge of the turntable.
- Moreover, a hole may be formed in the turntable, into which hole combustion ash of the solid fuels falls, and a combustion ash discharger may be provided below the turntable.
- Furthermore, a dust collector may be provided in a lower portion of the turntable, and the dust collector may be used to stir up the combustion ash that falls from the turntable.
- In addition, a second combustion chamber may be provided above the first combustion chamber for the flame generated by the combustion of the solid fuels to rise.
- Further, an air feeder that feeds air for combustion of the solid fuels may be provided in the second combustion chamber.
- Moreover, the agitator may include an agitating impeller or an elongate plate object to move the solid fuels accumulated on the turntable to a vicinity of the center of the turntable.
- Furthermore, the solid fuel combustion apparatus may further include: a combustion smoke imaging unit that images combustion smoke generated at a time of combustion of the solid fuels; and a fuel quantity controller that controls quantity of the solid fuels fed from the feeder to the first combustion chamber. The fuel quantity controller may control quantity of solid fuels fed from the feeder to the first combustion chamber by determining quantity of the burned solid fuels on the basis of a color of the combustion smoke imaged by the combustion smoke imaging unit.
- In addition, the solid fuel combustion apparatus may further include: a combustion smoke imaging unit that images combustion smoke generated at a time of combustion of the solid fuels; and an air volume controller that controls a volume of air fed from the air feeder to the second combustion chamber. The air volume controller may control the volume of air fed from the air feeder to the second combustion chamber by determining quantity of the burned solid fuels on the basis of a color of the combustion smoke imaged by the combustion smoke imaging unit.
- In the solid fuel combustion apparatus according to an embodiment of the present invention in which a plurality of solid fuels are fed to a combustion unit to obtain combustion heat through combustion, the combustion unit includes a first combustion chamber that burns solid fuels; a feeder that feeds the solid fuels to the first combustion chamber; a turntable that forms a lower surface portion of the first combustion chamber and turns the solid fuels fed from the feeder on the lower surface portion of the turntable, and an agitator that agitates the solid fuels accumulated on the turntable, thereby avoiding damage to portions related to the feed of the solid fuels configured by combustible solid wastes due to heat exposure during calcining.
- Features, advantages, and technical and industrial significance of exemplary embodiments of the invention will be described below with reference to the accompanying drawings, in which like numerals denote like elements, and wherein:
-
FIG. 1 is an overall side schematic diagram illustrating a solid fuel combustion apparatus according to an embodiment of the present disclosure, -
FIG. 2 is a plan view illustrating a combustion unit, -
FIG. 3 is a first side schematic diagram illustrating the combustion unit, -
FIG. 4 is a second side schematic diagram illustrating the combustion unit, -
FIG. 5 is a partial exploded view of a turntable, -
FIG. 6 is a plan view illustrating a second combustion chamber, -
FIG. 7 is an entire side schematic diagram illustrating the solid fuel combustion apparatus showing the turning flow created by combustion, -
FIG. 8 is a schematic block diagram illustrating a controller of the solid fuel combustion apparatus, and -
FIG. 9 is a flowchart illustrating a control flow of the solid fuel combustion apparatus. - The solid fuel combustion apparatus according to an embodiment uses combustible materials called RPF (refuse derived paper and plastics densified fuel) obtained by compressing solid combustible wastes such as resin (plastic) and paper as solid fuels. The solid fuels are fed into and burned in the combustion apparatus, generating combustion heat. When the solid fuels are heated rather than burned themselves, combustible gases are generated from the solid fuels. The combustible gases are then ignited to produce a flame, which is recovered as heat of combustion. The combustion heat generated may be supplied to heat exchangers for steam generation in boilers, for example, and the combustion heat itself may be used for heating, drying, and room heating, for example. As described above, the solid fuel combustion apparatus according to the embodiment is configured to obtain combustion heat from RPF solid fuels.
- Especially, the combustion efficiency of RPF solid fuels is high since they are made mainly from resins (plastics) and paper as waste materials. Further, the solid fuel combustion apparatus according to the embodiment is capable of processing combustible wastes. Accordingly, a reduction in a volume of emissions of carbon dioxide is more expected when heat is generated in comparison to a case where fuels such as heavy oil, and natural gas, for example, are newly burned. Obviously, a number of solid fuels are fed into the combustion apparatus. Accordingly, even if a solid fuel is simply referred to, it corresponds to multiple (multiple pieces, multiple quantities) of solid fuels.
-
FIG. 1 is an overall side schematic diagram illustrating a solid fuel combustion apparatus according to an embodiment of the present disclosure. The solidfuel combustion apparatus 1 includes afirst combustion chamber 11 as a main portion of acombustion unit 10 and into which solid fuels are brought and burned. Asecond combustion chamber 52,third combustion chamber 53, and connectingchamber 51 are provided immediately above thefirst combustion chamber 11 in this order. The second andthird combustion chambers first combustion chamber 11 to increase the heat of combustion. In the solidfuel combustion apparatus 1 according to the embodiment, thefirst combustion chamber 11, thesecond combustion chamber 52, and thethird combustion chamber 53 are all cylindrical in shape. This is because it is convenient for the heat flow to rise while swirling as described below. The connectingchamber 51 corresponds to a space for connecting the generated combustion heat to a heat exchanger of a boiler or heat transfer piping (both not shown). Thethird combustion chamber 53 may be omitted depending on the size of the solidfuel combustion apparatus 1 itself. - The
combustion unit 10 according to the embodiment mainly includes thefirst combustion chamber 11 that burns the solid fuels fed therein, afeeder 12 that feeds solid fuels to thefirst combustion chamber 11, aturntable 20 that forms and turns alower surface portion 17 of thefirst combustion chamber 11, and anagitator 30 that agitates the solid fuels fed thereto. - The
turntable 20 includes a hole 22 (seeFIG. 5 ) into which the calcined ashes of the solid fuels fall. Adust collecting chamber 18 is formed below theturntable 20 provided at thelower surface portion 17 of thefirst combustion chamber 11. - A
calcined ash discharger 42 is provided in thedust collecting chamber 18 below theturntable 20. The calcined ashes that fall into thedust collecting chamber 18 are conveyed by thecalcined ash discharger 42 to the calcinedash collecting box 45. - In the solid
fuel combustion apparatus 1 shown inFIG. 1 ,legs 19 support thedust collecting chamber 18 and thefirst combustion chamber 11 as well as configurations thereabove. Theturntable 20 is connected to aturntable shaft portion 26 and driven by a turning motor M4. Thecalcined ash discharger 42 is driven by a discharging motor M3. - The portions of the configuration will be described with reference to the overall side schematic diagram of the solid
fuel combustion apparatus 1 shown inFIG. 1 along with a plan view of thecombustion unit 10 shown inFIG. 2 . Thefeeder 12 includes a feedingrotary shaft 13 and a feedingimpeller 14 mounted on the feedingrotary shaft 13 in a spiral manner. The feedingimpeller 14 corresponds to a spiral propeller, referred to as Archimedes screw, or Archimedes spiral, for example. The feedingrotary shaft 13 and feedingimpeller 14 are rotated by the feeding motor M1. RPF as solid fuels is fed through the feeding port 15 (hopper) into thefeeder 12. As the feeding motor M1 is driven to rotate feedingrotary shaft 13 and feedingimpeller 14, the solid fuels move from the position of the feedingport 15 through the feedingimpeller 14 to the tip end of thefeeder 12, and fall from the tip end of thefeeder 12 into the interior of thefirst combustion chamber 11. - As understood from
FIG. 2 , the tip end of thefeeder 12 does not enter deeply into thefirst combustion chamber 11, but stays approximately at the inner wall surface. Accordingly, the tip end of thefeeder 12 is located immediately above thecircumferential edge 21 of theturntable 20. The fact that the tip end of thefeeder 12 does not enter deeply into thefirst combustion chamber 11 allows the feeder 12 (feedingrotary shaft 13 and feeding impeller 14) to be less prone to thermal damage, thereby reducing the frequency of replacement of the portions in thecombustion apparatus 1. Theturntable 20 shown inFIG. 2 may be disassembled for replacement. Specifically, the linear portion shown in theturntable 20 indicates a portion to be detached. - As understood from the side schematic diagram in
FIG. 3 , if solid fuels R continue to be dropped from the position at the tip end of thefeeder 12, they will be accumulated at thecircumferential edge 21 of theturntable 20 in thefirst combustion chamber 11. Accordingly, an uneven portion of the solid fuels R accumulated on the top surface of theturntable 20 needs to be moved. Accordingly, the solidfuel combustion apparatus 1 includes theagitator 30. - The
agitator 30 includes an agitatingrotary shaft 31 and an agitatingimpeller 32 mounted on the agitatingrotary shaft 31 in a spiral manner. The agitatingimpeller 32 corresponds to a spiral propeller, referred to as Archimedes screw, or Archimedes spiral, for example. The agitatingrotary shaft 31 and the agitatingimpeller 32 are rotated by the agitating motor M2. When the solid fuels R are fed from thefeeder 12, the solid fuels R accumulate unevenly on a portion of thelower surface portion 17 of thefirst combustion chamber 11. Even if theturntable 20 turns, they are still deposited on thecircumferential edge 21 of theturntable 20. Accordingly, the solid fuels R accumulated at thecircumferential edge 21 of theturntable 20 are moved to the vicinity of the center of theturntable 20 through the agitatingimpeller 32 of theagitator 30. -
FIG. 1 illustrates that portions of the agitatingimpeller 32 of theagitator 30 are provided at a slight distance upward from theturntable 20 located on thelower surface portion 17 of thefirst combustion chamber 11. In addition,FIG. 2 illustrates that the agitatingimpeller 32 of theagitator 30 extends from thecircumferential edge 21 of theturntable 20 toward the center of theturntable 20. As understood from the side schematic diagram inFIG. 4 , the solid fuels R scraped by the agitatingimpeller 32 of theagitator 30 are moved from thecircumferential edge 21 of theturntable 20 to the vicinity of the center. Simultaneously, theturntable 20 itself is turning at thelower surface portion 17 of thefirst combustion chamber 11. - Therefore, no matter where the solid fuels have accumulated on the
circumferential edge 21 of theturntable 20, through the operation of theagitator 30 and the turning of theturntable 20, the solid fuels are constantly being drawn away from thecircumferential edge 21 to the vicinity of the center of theturntable 20, and the accumulation (deposition) of the solid fuels changes into a mountain shape (seeFIG. 3 andFIG. 4 illustrating the positional change of the solid fuels). - The position of the
agitator 30 advances in the direction of the center of theturntable 20 from the viewpoint of demonstrating the performance of agitating. In this case, the agitatingrotary shaft 31 and agitatingimpeller 32 of theagitator 30 are thermally exposed to the combustion heat (thermal power) of the solid fuels. However, the combustion heat of the solid fuels is not hot enough to damage theagitator 30 at a location in the vicinity of thecircumferential edge 21 of theturntable 20. Rather, the upper portion of thefirst combustion chamber 11, and a portion even higher above it become hotter. Accordingly, theagitator 30 located in the vicinity of theturntable 20 is less effected from thermal damage caused by the combustion of the solid fuels. - In addition, the
agitator 30 allows for the movement of the solid fuels even during their combustion. Accordingly, the unburned solid fuels are moved on theturntable 20 by theagitator 30. The unburned solid fuels can then be fully burned at the moved location. This also clarifies that theagitator 30 contributes to improving the combustion efficiency of the solid fuels brought into thefirst combustion chamber 11. - With respect to the agitating
impeller 32 mounted on the agitatingrotary shaft 31 of theagitator 30, in the positive rotational direction, the solid fuels are moved to the vicinity of the center of theturntable 20 as described above. Here, theagitator 30 may reverse the rotational direction of the agitating impeller 32 (reverse rotation). When the agitatingimpeller 32 is reversed, the burned ashes (clinker, for example) remaining on theturntable 20 from the solid fuels are scraped off and discharged from the combustion unit 10 (first combustion chamber 11). - As another form of the
agitator 30, an elongate plate object (not shown) may be employed as a substitute for the agitatingrotary shaft 31 and agitatingimpeller 32. In this regard, an elongate rod object may be employed. The elongate plate object is inserted into thefirst combustion chamber 11 from the same position as that of theagitator 30 of thefirst combustion chamber 11. The position, angle, and length of insertion of the elongate plate object into the interior of thefirst combustion chamber 11 are suitably adjusted. Even by replacing theagitator 30 with the elongate plate object, the solid fuels are continually drawn from thecircumferential edge 21 to the vicinity of the center of theturntable 20 through the rotation of theturntable 20. - As understood from the entire side schematic diagram in
FIG. 1 (side schematic diagrams inFIGS. 3 and4 ), thedust collecting chamber 18 is formed below the lower surface portion 17 (turntable 20) of thefirst combustion chamber 11. Here, the partial exploded view inFIG. 5 shows theturntable 20 roughly cut in half, with the lower half ofFIG. 5 showing only theturntable 20, and the upper half showing the inside of thedust collecting chamber 18 immediately below theturntable 20. - A considerable number of
holes 22 are formed in the board surface of theturntable 20. The solid fuels R used (seeFIGS. 3 and4 ) correspond to an irregularly shaped mass of approximately 3 to 7 cm. The combustion residue from the burning of the solid fuels in thefirst combustion chamber 11 becomes calcined ashes As. The calcined ashes As then pass through theholes 22 and fall into thedust collecting chamber 18 immediately below theturntable 20. The shape of eachhole 22 may be round, square, or even an elongate slit shape as appropriate. The arrangement of theholes 22 may be radial from the center of theturntable 20, arc-shaped, or other as appropriate. - A
dust collector 40 is connected to theturntable shaft portion 26 at a lower portion of the turntable 20 (seeFIG. 5 ). Thedust collector 40 corresponds to a plate member that contacts the bottom surface of thedust collecting chamber 18 and has a length corresponding to the radius of the inside bottom surface of the dust collecting chamber 18 (seeFIGS. 1 ,3 , and4 ). The calcined ashes As that fall into thedust collecting chamber 18 are stirred up across the entire bottom surface of thechamber 18 by thedust collector 40, which turns in conjunction with the turning of the turntable 20 (turntable shaft portion 26) by the turning motor M4. The collected calcined ashes As are then guided through thedust collecting opening 41 to thecalcined ash discharger 42. - As shown in
FIGS. 1 ,3 , and4 , thecalcined ash discharger 42 includes a dischargingimpeller 43 mounted on a dischargingrotary shaft 44 in a spiral manner. The dischargingimpeller 43 corresponds to a spiral propeller, referred to as Archimedes screw, or Archimedes spiral, for example. The dischargingrotary shaft 44 and the dischargingimpeller 43 are rotated by the discharging motor M3. The calcined ashes As that fall from thedust collecting opening 41 and enter thecalcined ash discharger 42 are efficiently dropped through a calcinedash discharging opening 46 into a calcinedash collecting box 45 by the dischargingimpeller 43. - According to the solid
fuel combustion apparatus 1 according to the embodiment, theturntable 20 is driven to turn at a rotational speed of one rotation per minute. The rotational speed is appropriate depending on the size of the device itself. Theturntable 20 is driven to turn when the solid fuels are brought in and formed into a mountain shape on theturntable 20, and when the calcined ashes are removed after the combustion. If the bringing of the solid fuels to thefirst combustion chamber 11 is continuous, theturntable 20 is always driven to turn. - As shown in
FIG. 1 , the solidfuel combustion apparatus 1 according to the embodiment includes asecond combustion chamber 52 and athird combustion chamber 53 above thefirst combustion chamber 11. During combustion of combustible gases produced from the heated solid fuel, air is fed from the outside of thecombustion apparatus 1 to increase its combustion efficiency. Specifically, thesecond combustion chamber 52 includes an air feeder as shown in the plan view inFIG. 6 . In the embodiment, afirst air feeder 55 and asecond air feeder 56 are provided. Air enters thesecond combustion chamber 52 from both thefirst air feeder 55 and thesecond air feeder 56. The wind pressure of the incoming air triggers a swirling flow of flame (flame vortex, or heat flow) inside thesecond combustion chamber 52, including thefirst combustion chamber 11, as shown by the arcuate arrow inFIG. 6 . - The swirling flow of the flame generated by the combustion of the solid fuels (combustible gas) spreads to the
first combustion chamber 11 and thesecond combustion chamber 52. As shown in the entire side schematic diagram inFIG. 7 , the swirling flow of the flame indicated by the arcuate arrows then vertically rises through thefirst combustion chamber 11, thesecond combustion chamber 52, and thethird combustion chamber 53. As described above, the flame grows from the solid fuels accumulated in thefirst combustion chamber 11 to a height where it reaches thesecond combustion chamber 52 andthird combustion chamber 53, thereby creating a swirling flow of flame. The temperature on the upper side of the flame is high relative to the size of the rising flame. Therefore, to obtain more combustion heat from the solid fuels per weight, it is desirable that thesecond combustion chamber 52 be provided above thefirst combustion chamber 11, and even thethird combustion chamber 53 be provided. - From the series of descriptions and illustrations, the efficient combustion of the solid fuels in the solid
fuel combustion apparatus 1 according to the embodiment is described. The mechanism of the control of the combustion conditions in the solidfuel combustion apparatus 1 according to the embodiment will now be described. In the example of the solidfuel combustion apparatus 1 according to the embodiment, the color of the combustion smoke (black, white, or colorless, for example) generated when the solid fuels are burning is identified to determine whether the solid fuels are burning well (complete or incomplete combustion), thereby controlling the solid fuel feeding rate and air feeding rate. -
FIG. 8 is a block diagram illustrating a schematic configuration of thecontroller 100 implemented in the solidfuel combustion apparatus 1 according to the embodiment. Thecontroller 100 is configured by a microcomputer or other hardware needed for receiving various signals, performing computations, storing, or controlling operations, for example, as well as aCPU 101,ROM 102,RAM 103,storage 104, and input/output interface (I/O) 105, for example. - When the functional units of the controller 100 (computer) in
FIG. 8 are embodied by software, thecontroller 100 is embodied by executing the instructions of the program as software that embodies the functions. The recording medium for storing this program may include a "non-transient tangible medium" such as a CD, DVD, semiconductor memory, or programmable logic circuit. The program may also be supplied to thecontroller 100 of the solidfuel combustion apparatus 1 via any transmission medium capable of transmitting the program (communication network, and broadcast wave, for example). - The
storage 104 of thecontroller 100 may correspond to a known storage device such as an HDD or SSD. Thestorage 104 may be directed to an external server (not shown). Thestorage 104 stores various data, information, programs, and other data needed to execute the programs. The functional units that execute various computations, operations, and other arithmetic operations may correspond to theCPU 101 and other arithmetic elements, for example. In addition, input devices such as a keyboard, or mouse, for example (not shown), a display (a display or other display device not shown), output devices for outputting data, for example, may also be appropriately connected to theI/O 105of thecontroller 100. - The combustion
smoke imaging unit 110 may correspond to a publicly known CCD camera, and CMOS image sensor, for example. The color (black, white, or colorless, for example) of the combustion smoke K generated when the solid fuels are burning in thefirst combustion chamber 11 is imaged. The upper portion of the color of the combustion smoke is then transmitted to thecontroller 100. - The fuel quantity controller corresponds to the feeding motor M1 of the
agitator 30 inFIG. 8 . The quantity of the solid fuels fed from theagitator 30 to thefirst combustion chamber 11 is increased or decreased by controlling increasing and decreasing of the rotational speed of the feedingrotary shaft 13 and the feedingimpeller 14 of the feeding motor M1. - The air volume controller corresponds to the air feeder F in
FIG. 8 . The air feeder F may correspond to a known blower, for example, which feeds air (oxygen) to thefirst air feeder 55 and thesecond air feeder 56 in the embodiment. The volume of air fed from the air feeder F to thesecond combustion chamber 52 is controlled to be increased or decreased to increase or decrease the volume of oxygen in thefirst combustion chamber 11. - As shown in
FIG. 8 , a combustionsmoke imaging unit 110, feeding motor M1 (fuel quantity controller), and air feeder F (air volume controller) are connected to the I/O 105 and controlled by theCPU 101 in thecontroller 100. - With reference to the flowchart in
FIG. 9 , the form of the control of the combustion conditions of the solid fuels will be described below. First, combustion smoke generated during the combustion of the solid fuels is imaged by a combustion smoke imaging unit 110 (step S101). The information on the imaged combustion smoke is transmitted to thecontroller 100 to determine the amount of combustion of the solid fuels. That is, a determination of a smoke color is performed as to whether the color of the combustion smoke corresponds to one of the colors (e.g., black, white, or colorless) of the smoke (step S102). For example, it is determined whether the color of the imaged combustion smoke is more black on the basis of a comparison between the color and a pre-defined reference color of the smoke color. If the color of the combustion smoke is relatively white or colorless as a result of the determination of the smoke color, the combustion state of the solid fuels may be determined to be generally complete. In this case, the current quantity of fed solid fuels and current volume of the fed air are maintained at the current level. Accordingly, the status quo is maintained for the feeding motor M1 (fuel quantity controller) and the air feeder F (air volume controller), and the process ends with no change. - In contrast, if the color of the combustion smoke is relatively black or dark gray as a result of the determination of the smoke color, the combustion state of the solid fuels is likely to be incomplete combustion. In this case, the current quantity of the fed solid fuels and current volume of the fed air need to be changed to transition the state to the complete combustion. This instructs the feeding motor M1 (fuel quantity controller) and air feeder F (air volume controller) to change (step S104). The process is completed as described above. The combustion smoke is then imaged again, the determination of the smoke color is performed, and the combustion state of the solid fuels is checked.
- Specifically, the feeding motor M1 (fuel quantity controller) is controlled to reduce the quantity of solid fuels fed from the
feeder 12 to thefirst combustion chamber 11. The air feeder F (air volume controller) is also controlled to increase the volume of the air fed from the air feeders (first air feeder 55 and second air feeder 56) to thesecond combustion chamber 52. The control to increase the quantity of solid fuels or to decrease the volume of air may be employed. Both the feeding motor M1 (fuel quantity controller) and the air feeder F (air volume controller) may be controlled simultaneously. - Further, even in the case of increasing or decreasing the amount of combustion heat needed at a time when the solid
fuel combustion apparatus 1 is in operation, control is also performed over either or both the feeding motor M1 (fuel quantity controller) or the air feeder F (air volume controller) via thecontroller 100. -
- 1: solid fuel combustion apparatus
- 10: combustion unit
- 11: first combustion chamber
- 12: feeder
- 13: feeding rotary shaft
- 14: feeding impeller
- 17: lower surface portion
- 18: dust collecting chamber
- 20: turntable
- 30: agitator
- 31: agitating rotary shaft
- 32: agitating impeller
- 40: dust collector
- 41: dust collecting opening
- 42: calcined ash discharger
- 43: discharging impeller
- 44: discharging rotary shaft
- 45: calcined ash collecting box
- 51: connecting chamber
- 52: second combustion chamber
- 53: third combustion chamber
- M1: feeding motor (fuel quantity controller)
- M2: agitating motor
- M3: discharging motor
- M4: turning motor
- R: solid fuel
- As: calcined ash
- 100: controller (computer)
- 101: CPU
- 102: ROM
- 103: RAM
- 104: storage
- 105: input/output interface
- 110: combustion smoke imaging unit
- F: air feeder
- K: combustion smoke
Claims (9)
- A solid fuel combustion apparatus in which a plurality of solid fuels are fed to a combustion unit to obtain combustion heat through combustion, wherein
the combustion unit includes:a first combustion chamber that burns the solid fuels;a feeder that feeds the solid fuels to the first combustion chamber;a turntable that forms a lower surface portion of the first combustion chamber and turns the solid fuels fed from the feeder on the lower surface portion of the chamber; andan agitator that agitates the fuels accumulated on the turntable. - The solid fuel combustion apparatus according to claim 1, wherein the first combustion chamber is cylindrical in shape and the feeder feeds the solid fuels to a circumferential edge of the turntable.
- The solid fuel combustion apparatus according to claim 1, whereina hole is formed in the turntable, into which hole combustion ash of the solid fuels falls, anda combustion ash discharger is provided below the turntable.
- The solid fuel combustion apparatus according to claim 3, whereina dust collector is provided in a lower portion of the turntable, andthe dust collector stirs up the combustion ash that falls from the turntable.
- The solid fuel combustion apparatus according to claim 1, wherein
a second combustion chamber is provided above the first combustion chamber for flame generated by combustion of the solid fuels to rise. - The solid fuel combustion apparatus according to claim 5, wherein
an air feeder that feeds air for combustion of the solid fuels is provided in the second combustion chamber. - The solid fuel combustion apparatus according to claim 1, wherein
the agitator includes an agitating impeller or an elongate plate object to move the solid fuels accumulated on the turntable to a vicinity of the center of the turntable. - The solid fuel combustion apparatus according to claim 1, further comprising:a combustion smoke imaging unit that images combustion smoke generated at a time of combustion of the solid fuels; anda fuel quantity controller that controls quantity of the solid fuels fed from the feeder to the first combustion chamber, whereinthe fuel quantity controller controls quantity of solid fuels fed from the feeder to the first combustion chamber by determining quantity of the burned solid fuels on the basis of a color of the combustion smoke imaged by the combustion smoke imaging unit.
- The solid fuel combustion apparatus according to claim 6, further comprising:a combustion smoke imaging unit that images combustion smoke generated at a time of combustion of the solid fuels; andan air volume controller that controls a volume of air fed from the air feeder to the second combustion chamber, whereinthe air volume controller controls the volume of air fed from the air feeder to the second combustion chamber by determining quantity of the burned solid fuels on the basis of a color of the combustion smoke imaged by the combustion smoke imaging unit.
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PCT/JP2021/007787 WO2022185392A1 (en) | 2021-03-01 | 2021-03-01 | Solid fuel combustion device |
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EP4303487A1 true EP4303487A1 (en) | 2024-01-10 |
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EP21928970.9A Pending EP4303487A1 (en) | 2021-03-01 | 2021-03-01 | Solid fuel combustion device |
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EP (1) | EP4303487A1 (en) |
JP (2) | JP7256577B2 (en) |
KR (1) | KR20230148356A (en) |
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TW (2) | TWI828070B (en) |
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JP6150596B2 (en) | 2013-04-18 | 2017-06-21 | 有限会社長岡鉄工所 | Solid fuel combustion device and boiler device |
JP6310656B2 (en) * | 2013-08-09 | 2018-04-11 | 株式会社山本製作所 | Combustion device |
EP3001103A1 (en) * | 2014-09-25 | 2016-03-30 | Caldereria Quintin, S.L. | System for cleaning the burner and confining fuel in solid fuel boilers |
KR101726047B1 (en) * | 2015-06-08 | 2017-04-27 | 주식회사 포스코 | Combustor |
WO2016210317A2 (en) * | 2015-06-26 | 2016-12-29 | Universal Leaf Tobacco Company, Inc. | Biomass fuel stove |
JP6822653B2 (en) * | 2016-10-03 | 2021-01-27 | 株式会社武田鉄工所 | Combustion device and heat supply system using it |
JP2018091593A (en) * | 2016-11-30 | 2018-06-14 | 有限会社テクノクラフト | Pellet combustion device |
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JP3230152U (en) * | 2020-10-25 | 2021-01-14 | グリーンパワーテクノ株式会社 | Rice husk fuel cogeneration equipment |
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2021
- 2021-03-01 KR KR1020237032536A patent/KR20230148356A/en unknown
- 2021-03-01 EP EP21928970.9A patent/EP4303487A1/en active Pending
- 2021-03-01 WO PCT/JP2021/007787 patent/WO2022185392A1/en active Application Filing
- 2021-03-01 JP JP2022506691A patent/JP7256577B2/en active Active
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WO2022185392A1 (en) | 2022-09-09 |
JPWO2022185392A1 (en) | 2022-09-09 |
JP2023068162A (en) | 2023-05-16 |
JP7256577B2 (en) | 2023-04-12 |
CN117255918A (en) | 2023-12-19 |
TW202413847A (en) | 2024-04-01 |
KR20230148356A (en) | 2023-10-24 |
TW202235777A (en) | 2022-09-16 |
TWI828070B (en) | 2024-01-01 |
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