JP2003207121A - Oxygen enriched mixture blow-in type waste incinerator with settled fire grate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waste incinerator eliminating the existence of incomplete combustion residuals and suppressing the generation of dioxine. <P>SOLUTION: Pure oxygen is used as a supplementary firing agent in blowing an oxygen enriched mixture with the pure oxygen premixed with outside air into an incinerator to form a high-temperature atmosphere therein. Further, a settled fire grate having a plurality of blades heated up to a high temperature is settled on wastes by its dead weight. With the heated blades being moved among the wastes, the wastes residing at the bottom of the incinerator undergo complete combustion. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pure oxygen blown type exhaust gas incinerator.

[0002]

2. Description of the Related Art In a conventional waste incinerator, there is no one in which pure oxygen and outside air are mixed in advance at an arbitrary mixing ratio and blown indirectly into the furnace. Pure oxygen is directly fed into the furnace by a steel pipe or the like. Since it is blown in, there is a possibility that it will be consumed due to corrosion of the blow-in pipe, that is, the lance pipe, and backfire, etc.In addition, since the waste to be input has many contact surfaces with air, it may be pulverized beforehand in advance. Often found, the waste at the bottom of the furnace has little chance of coming into contact with air and often remains as incomplete combustion.

[0003]

A waste incinerator capable of eliminating incomplete combustion residues and suppressing generation of dioxins is constructed.

[0004]

[Means for Solving the Problems] Pure oxygen is used as an auxiliary combustion material, and the oxygen-enriched air-fuel mixture in which pure oxygen is mixed with the outside air in advance is blown to raise the temperature of the atmosphere inside the furnace to a high temperature, and then heat it to a high temperature. A subsidence grate having a plurality of blades set down is settled on the waste by its own weight, and the heated blade advances in the waste, thereby completely burning the waste remaining in the bottom of the furnace.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. In order to achieve claim 1, a primary combustion furnace outer shell (outer shell) 18 made of a steel plate and a primary combustion furnace inner wall 19 (inner shell) made of a high temperature and corrosion resistant material such as refractory bricks are used. A pedestal 26 in which the corrugated bottom plate 20 is connected to the lower pit 35 of the constructed primary combustion furnace 9 by a level adjusting leg 37 and a hinge 27,
An elevating device 28 for holding the pedestal 26 at the bottom of the combustion furnace until completion of incineration, and lowering the pedestal 26 after completion of combustion, the pedestal 2
6. A stopper 36 is provided for inclining the corrugated bottom plate 20 parallel to the inclination angle θ about the hinge 27 when descending.

On the upper part of the inner wall 19 of the primary combustion furnace, a flue gas rectifying cone 35 is provided for the purpose of uniformizing the primary combustion furnace exhaust pipe 22 and the combustion in the furnace and rectifying the exhaust gas.

The front wall of the primary combustion furnace inner wall 19 is provided with a waste input door / slide guide plate 33 and a combustion confirmation window 23 in which heat resistant glass is fitted, and the mixture supply duct 3 is provided in the lower part of the furnace.
Install 4 at any position on the front or back or left and right.

Furthermore, a grate frame / mixture blocking frame 32, to which a plurality of grate blades 21 are attached, penetrates the grate hook lifting slits 25 provided on the inner wall 19 of the primary combustion furnace, and is provided at four corners of the frame. The grate lifting hoisting steel rope 24 is tightly bound to the attached grate hook 30 and the steel rope 24 is hoisted upward by an external hoisting device or the like, or is held as it is suspended. Or, it can be lowered to an arbitrary height, and thereafter, it can be submerged by its own weight of the grate frame / air mixture blocking frame 32.

When the waste 8 is put into the primary combustion furnace 9 without being crushed and is left as it is, the waste 8 is appropriately dispersed due to the unevenness of the corrugated bottom plate 20 held at the bottom of the furnace, and the grate frame is provided. After lowering the combined gas / air mixture blocking frame 32 on the appropriately dispersed waste 8, the hoisting machine installed outside is released so that the grate frame / mixed gas blocking frame 32 can be freely submerged by its own weight. .

After the waste 8 is charged, the electric motor 40 of the pressure blower (a) 5 is started to suck the outside air from the air intake port 1, and the air pressure in the narrowed portion in the venturi pipe 38 provided on the way is reduced. Then, the pure oxygen in the pure oxygen tank 3 whose flow rate is controlled is similarly sucked from the pure oxygen delivery pipe 39 provided in the narrowed portion by the flow rate adjusting valve 4 and mixed with the outside air to form the oxygen-enriched mixture. To generate.

The oxygen-enriched air-fuel mixture generated as described above is supplied to the bottom of the inner wall 19 of the primary combustion furnace through the air-fuel mixture supply duct 34 and the concave portion of the corrugated bottom plate 20, so that the atmosphere in the furnace is enriched with oxygen. Ignite the waste with a petroleum burner or an igniter.

When the combustion is started as described above, the waste becomes incinerated ash and is reduced in volume, and at the same time, the grate frame / mixture blocking frame 32 placed on the waste sinks and constitutes the frame. A plurality of grate blades 21 heated to a high temperature enter the lower unburned waste, and the waste that has stayed at the combustion limit, that is, the recess base of the corrugated bottom plate 20, progresses to incineration ash, Can completely burn waste.

In order to implement claim 2, FIG. 7 and FIG.
When the grate frame / mixture blocking frame 32 composed of a plurality of grate blades 21 having a cross section such as
The outlet of the air-fuel mixture supply duct 34 is gradually closed, and the grate blade 21 sinks to the combustion limit, that is, the bottom of the corrugated bottom plate 20 or the incineration ash accumulated on it, and when it reaches the exhaust gas outlet of the duct 34 is completely completed. The air-fuel mixture pressure in the duct 34 rises.

The pressure sensor 6 installed in the air-fuel mixture supply duct 34 sends the change information of the air-fuel mixture pressure to the control device 7 for controlling the electric motor 40 linked with the pressure blower (a) 5 as described above. The control device automatically adjusts or cuts off the amount of the air-fuel mixture blown into the furnace by decelerating or stopping the rotation of the electric motor 40 within a preset variable range.

In order to achieve claim 3, the primary combustion furnace 9
The exhaust gas discharged from the exhaust gas is introduced into the secondary combustion furnace 10 through the primary combustion furnace exhaust pipe 22, and the wedge shape (corresponding to the high temperature and corrosion resistant material is formed at an arbitrary position of the exhaust flow in the secondary combustion furnace). (Or triangular) columns are installed as shown in FIGS. 11 and 12 to form a wedge-type turbulent flow generation plate 41.

Immediately before the wedge-shaped turbulence generating plate 41, the oxygen-enriched mixture is blown again by the mixture supply duct 34,
At the same time as cooling the wedge-shaped turbulence generating plate 41, the exhaust gas discharged from the primary combustion furnace 9 that still contains sufficient carbon monoxide (CO) due to the turbulent flow generated behind the wedge-shaped turbulent generating plate 41. Carbon monoxide (C
O) is removed.

In order to realize the fourth aspect, the soot dust in the exhaust gas from the secondary combustion furnace 10 is removed in advance by a generally known cyclone 12.

Exhaust gas from the secondary combustion furnace 10 from which the soot and dust have been removed by the above is introduced into the temperature reducing furnace 13 as shown in FIG.

The lower level _{y 1} of the exhaust tube 17 in the temperature reducing furnace 13 in FIG. 13, the center line _{y 2} exhaust introduction pipe 42, the height relationship between the center line _{y 3} of the outside air supply pipe is _y 1 _<y 2 <y ₃ , the high temperature exhaust rises and the low temperature outside air falls, so that convection is efficiently generated and the temperature of the secondary combustion furnace 1 is lowered.
The exhaust from 0 is directly discharged to the atmosphere by the exhaust stack 17,
Alternatively, it can be delivered to a dioxin decomposing device 15 which is commercially available or under development.

In any of the above-mentioned discharge methods, it is necessary to discharge from the final discharge cylinder 17 through the bag filter 16, and the same applies to the discharge from the dust collecting cylinder 43 below the cyclone 12 and the temperature lowering furnace 13. Need a bug filter on.

In order to achieve claim 5, the incineration ash deposited on the bottom of the incinerator, that is, the base of the corrugated bottom plate 20 after the incineration of the waste is completed is placed in the pit 35 below the primary combustion furnace. In order to collect in the incineration ash recovery container 29, the upper position holding state of the lifting device 28 is released, and the pedestal 26 to which the lifting device 28 is connected, and the hinge 27 on the pedestal 26 are connected thereto, and the level adjusting legs 37 The corrugated bottom plate 20 holding the horizontal position is lowered to a preset height.

In the above description, the preset height is
The corrugated bottom plate 2 is attached to the stopper 36 installed in the pit 35.
The bottom surface of 0 corresponds to the height at which the most suitable angle θ for collecting incinerated ash is created by the contact points between the center of the hinge 27, the stopper 36 and the bottom surface of the corrugated bottom plate 20.

In order to achieve the sixth aspect, as shown in FIG. 9, on the upper surface of the base portion of the corrugated bottom plate 20, a water pool in a gentle arc is provided in a two-dimensional cross section parallel to the convex portion or the concave portion.

[0024]

Since the present invention is constructed as described above, it has the following effects.

By mixing the outside air and pure oxygen with a mixing device in advance and blowing them into the incinerator as an oxygen-enriched mixture, the atmosphere in the furnace becomes uniform and uneven combustion can be avoided.

By blowing in an oxygen-enriched mixture, high-temperature combustion becomes possible, and a combustion temperature that can meet the national standards (> 800 ° C) necessary for suppressing the decomposition of dioxin can be secured, and waste containing a large amount of water. It is also possible to completely burn things.

By injecting pure oxygen indirectly, the risk of backfire can be avoided.

The grate blade heated to a high temperature can be advanced into the waste along with the combustion, and can be completely burned to the waste at the bottom of the incinerator.

The bottom of the incinerator has a corrugated shape, and the input waste is dispersed without crushing and the recess is used as an extension of the air-fuel mixture blowing duct.

By using a decompression furnace, it is possible to achieve an exhaust gas temperature (<400 ° C.) for suppressing dioxin, and it is possible to connect to a commercially available or developed dioxin decomposition apparatus.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a main incinerator.

FIG. 2 is a front view of a primary combustion furnace.

FIG. 3 is a top view of a grate in the primary combustion furnace.

FIG. 4 is a right side view of the primary combustion furnace with a waste input door opened.

FIG. 5 is a right side view of the primary combustion furnace.

FIG. 6 is a right side view when the corrugated bottom plate on the bottom surface is inclined by θ degrees when recovering incineration ash.

FIG. 7 is a front sectional view of a grate blade and a corrugated bottom plate.

FIG. 8 is a side sectional view of a grate blade and a corrugated bottom plate.

FIG. 9 is a side sectional view of a corrugated bottom plate base.

FIG. 10 is a cross-sectional view of a mixing device including a Venturi tube and a pressure blower.

FIG. 11 is an upper sectional view of a secondary combustion furnace.

FIG. 12 is a side sectional view of a secondary combustion furnace.

FIG. 13 is a cross-sectional view of a temperature reducing furnace.

[Explanation of symbols]

1 Outside Air Intake Port 2 Air Mixing Device 3 Pure Oxygen Tank 4 Flow Rate Control Valve 5 Pressurized Blower (a) 6 Pressure Sensor 7 Control Device 8 Waste 9 Primary Combustion Furnace 10 Secondary Combustion Furnace 11 Incinerator Ash 12 Cyclone 13 Decompressor 14 Pressurized Blower (b) 15 Dioxin Decomposing Device 16 Bag Filter 17 Exhaust Cylinder 18 Primary Combustion Furnace Outer Shell (Outer Shell) 19 Primary Combustion Furnace Inner Wall (Inner Shell 9 20 Corrugated Bottom Plate 21 Grate Blade 22 Primary Combustion Furnace Exhaust Cylinder 23 Combustion Confirmation Window 24 Grate Lifting Steel Cable 25 Grate Hook Lifting Slit 26 Pedestal 27 Hinge 28 Lifting Device 29 Incinerated Ash Collection Container 30 Grate Frame Hook 31 Steel Cable Penetration Hole 32 Grate Frame and Mixture Block 33 Waste input door and sliding guide plate 34 Mixture supply duct 35 Exhaust flow rectifying cone 36 Stopper 37 Level adjusting leg 38 Ben Jury tube 39 pure oxygen delivery tube 40 motor 41 wedge turbulence generating plate 42 exhaust introduction pipe 43 outside air supply pipe 44 the dust collecting vessel _{y 1} chimney lower level _{y 2} exhaust introduction pipe centerline _{y 3} outside air supply pipe center line

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F23J 15/06 F23L 7/00 A 3K078 F23L 7/00 F27D 17/00 104D 4K056 F27D 17/00 104 104G F23G 5/00 110 // F23G 5/00 110 F23J 15/00 K F Term (reference) 3K023 JA02 3K061 GA06 JA12 JA15 3K062 AA16 AB01 BA01 CB03 DA11 DB05 3K065 AA16 AB01 GA03 GA13 GA23 GA33 3K070 DA05 DA29 DA47 3K078 BA03 CA25 4K056 AA19 BA07 BB01 CA20 DB03 DB04 DB05 DB13 FA03 FA08

Claims (6)

[Claims] 1. A corrugated bottom plate 20 which is held at the same level as the bottom surface by an elevating device 28 on the bottom surface of a primary combustion furnace 9 made of a material having high temperature resistance and corrosion resistance such as refractory bricks.
The waste 8 is put in the original form through the waste input port 21 as it is, and at the same time, the pure oxygen tank is passed through the outside air sucked by the pressure blower (a) 5 operated by the electric motor 40 and the flow rate adjusting valve 4. The oxygen (O2) stored in 3 is mixed by the air mixing device 2 at a preset mixing ratio to generate an oxygen-enriched mixture, and the mixture is supplied to the mixture supply duct 34 and the inner wall of the primary combustion furnace. The primary combustion furnace 9 is blown into the primary combustion furnace 9 through the concave portion of the corrugated bottom plate 20 held in the lower part of 19 to ignite the waste material 8, while
Suspended above the inner wall 19 of the primary combustion furnace, made of a material having high temperature and corrosion resistance, such as stainless steel or ceramics, which is composed of a plurality of grate blades 21 and serves as a grate frame and mixture cutoff. The upper position holding state of the frame 32 is released, and the grate blade 21 which is heated to a high temperature by being burned in the furnace atmosphere filled with the oxygen-enriched air-fuel mixture is caused to sink by the dead weight on the injected waste 8. , As the waste 8 burns, sinks into the lower unburned waste 8 and progresses to ignite the unburned waste 8 to promote combustion and promote oxygen enrichment. Air-blown waste incinerator. 2. The grate blade 2 according to claim 1, when the waste material 8 burns, a grate frame / mixture blocking frame 32 composed of a plurality of grate blades 21 sinks, and the grate blade 2
1 almost reaches the base of the concave portion of the corrugated bottom plate 20, so that the frame around the grate blade 21, that is, the grate frame / mixture blocking frame 32 closes the mixture discharge port of the mixture supply duct 34, The pressure in the air-fuel mixture supply duct 34 rises, and the pressure change information detected by the pressure sensor 6 installed in the air-fuel mixture supply duct 34 is the pressure blower (a).
5. An oxygen-enriched mixture-blown waste incinerator having a subsidence grate capable of decelerating or stopping the electric motor 40 of the pressure blower, which is sent to the controller 7 of FIG. 3. A wedge-shaped turbulent flow generation plate 41 is provided inside the exhaust gas discharged from the primary combustion furnace 9 in front of the wedge-shaped turbulent flow generation plate 41 for the purpose of completely removing carbon monoxide (CO). At the same time as blowing the oxygen-enriched air-fuel mixture through the air-fuel mixture supply duct 34 to cool the wedge-shaped turbulent flow generation plate 41,
Due to the turbulent flow generated behind the wedge-shaped turbulent flow generation plate 41, it is possible to efficiently mix the exhaust gas discharged from the primary combustion furnace 9 and the oxygen-enriched air-fuel mixture to remove carbon monoxide (CO). , An oxygen-enriched mixture-blown waste incinerator having a subsidence grate provided with a secondary combustion furnace 10. 4. In order to rapidly reduce the exhaust gas temperature, reduce the dioxin in the exhaust gas and release the exhaust gas directly into the atmosphere, or to send the exhaust gas to a dioxin decomposition device 15 for removing dioxin, Exhaust gas discharged from the secondary combustion furnace 10 from which dust has been removed by the cyclone 12 is introduced through the exhaust gas introduction tube 42, and external air is blown in by the pressure blower (b) 13 to mix with the external air, thereby producing the exhaust gas. An oxygen-enriched mixture-blown waste incinerator with a subsidence grate equipped with a decommissioning furnace capable of rapidly reducing the temperature. 5. After the incineration of the waste 8 is completed by the lifting device 28 installed in the pit 35 at the bottom of the primary combustion furnace 9,
The bottom of the combustion furnace, that is, the corrugated bottom plate 20 is lowered together with the pedestal 26, and a stopper is installed on the inner wall of the pit 35 so that the inclination angle θ around the hinge 27 can be obtained in advance, and the corrugated bottom plate 20 remains in the corrugated bottom plate 20. An oxygen-enriched mixture-blown waste incinerator having a sinking grate capable of dropping the existing incineration ash into the incineration ash recovery container 29. 6. A corrugated bottom plate 20 included in the primary combustion furnace 9.
Oxygen-enriched mixture-blown waste incinerator with a subsidence grate that has a gentle recess on the bottom surface of the tank and has pooled water.