JP2003313559A - Rotary kiln type carbonizing and burning method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary kiln type carbonizing and burning method and apparatus in which non-pollution of a discharge gas of the rotary kiln type carbonizing and burning apparatus and shortening of a treating time of a raw material is carried out in a discharge gas combustion type medium wavelength infrared ray luminous cylinder in the apparatus. <P>SOLUTION: A pollution-free combustion gas obtained by re-combustion heat decomposition of the discharge gas in a combustion chamber 16 produced when the raw material is burned is fed into the discharge gas combustion type medium wavelength infrared ray luminous cylinder 13 hung in the interior of a rotating drum 12 and forming the combustion chamber 16 at one end, and the discharge gas combustion type medium wavelength infrared ray luminous cylinder 13 is heated to nearly 850°C at which heat radiation having about 4 μm wavelength is radiated to adopt the resultant heat as a heating source for the raw material. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating method for a carbonization and firing furnace, in which both ends of a rotary cylinder are sealed with fixed outside air shielding shells, and an exhaust gas combustion type mid-wavelength infrared emission tube is provided in an inner space in the axis direction of the rotary cylinder. In order to reduce the processing time of the raw material by irradiating medium-wavelength infrared light to reduce the size of the entire device, exhaust gas generated during processing is sucked into the combustion chamber formed at one end of the light emitting tube and regenerated. Combustion treatment is performed and the generated heat is used as a medium wavelength infrared light emission heat source, and the combustion temperature of the exhaust gas combustion type medium wavelength infrared light emission tube is set to about 850 ° C. and the emission wavelength is set to about 4 μm. The present invention relates to a rotary kiln type carbonization and calcination method having excellent heat permeability and capable of shortening a processing time, and an apparatus directly used for carrying out the method.

[0002]

2. Description of the Related Art FIG. 6 shows a partial vertical cross-sectional view of a conventional rotary kiln type carbonization / baking apparatus A. A combustion heating furnace 3 is provided between the left and right rotating wheels 2 on the outside of the metal rotary drum 1 and both ends of the metal rotary drum 1 are sealed with fixed type outside air shielding shells 4, and the outer peripheral surface of the metal rotary drum 1 is used as a combustion burner 5. Since it is heated directly by heating, the metal rotary drum 1 is made of an expensive heat-resistant material, and a re-combustion chamber 8 for re-combusting the generated gas through the exhaust gas pipes 6 and 7 is separately installed.

Further, since the outsides of the rotary drums 1 on the left and right of the combustion heating furnace 3 are in direct contact with the outside air to release heat, a large heat loss occurs. In the figure, 9 is a raw material charging hopper, 10 is an insertion pusher mechanism, and 11 is a carbonized finished product discharge port.

[0004]

In the conventional rotary kiln type carbonization and firing apparatus A, the rotary drum 1 is made of heat-resistant steel, and the heating furnace 3 is provided outside the rotary drum 1 for direct heating. For this reason, the rotary cylinder 1 is partially exposed to red heat and repeatedly expands and contracts greatly, leading to material fatigue and damage, and the heating furnace 3 enlarges the device, resulting in a large loss of heat consumption and exhaust gas treatment outside. Since it is performed in the re-combustion chamber 8 of another device, there is a problem that the device manufacturing cost and the fuel cost are high.

The main objects to be solved by the present invention are as follows. That is, the first object of the present invention is to provide a rotary kiln type carbonization and firing method and apparatus which can reduce the manufacturing cost of the apparatus and equipment.

A second object of the present invention is to provide a rotary kiln type carbonization and firing method and apparatus capable of saving energy and running costs.

A third object of the present invention is to provide a rotary kiln type carbonization and firing method and apparatus capable of preventing pollution by a compact design.

Other objects of the present invention will be apparent from the description, drawings, and particularly the description of each claim.

[0009]

In order to achieve the above object, the method of the present invention mounts a reburnt exhaust gas hollow vent passage as a heating heat source in a closed rotating atmosphere, and the reburned exhaust gas hollow vent passage is installed. By using the exhaust gas combustion type mid-wavelength infrared light emitting tube, the whole becomes a compact design, the manufacturing cost, the installation area can be reduced, the exhaust gas generated can be simply and completely treated, and the heat of burning the exhaust gas A characteristic construction method is taken as a heat source for carbonization firing.

In order to achieve the above-mentioned object, the apparatus of the present invention is equipped with a folded parallel exhaust gas combustion type medium wavelength infrared emitting tube as a heating heat source inside a rotary kiln type rotary cylinder, and is made compact and carbonized in the same apparatus. At the same time as firing, a characteristic constitution means is provided for recovering and effectively utilizing the re-combustion gas energy of exhaust gas to the heating heat source and discharging it as a clean gas.

More specifically, in order to solve the above problems, the present invention achieves the above-mentioned object by adopting a novel characteristic construction method or means ranging from a superordinate concept to a subordinate concept enumerated below. To be done.

The first feature of the method of the present invention is that first, combustion air is fed from one end of a reburnt exhaust gas hollow ventilation passage inserted and extended in a closed rotating atmosphere to raise the internal temperature to around 850 ° C. Constant temperature control is performed, heat rays having a wavelength of around 4 μm are constantly radiated in the closed rotating atmosphere, and then,
The raw material which is fed into the sealed rotating atmosphere in the oxygen deficient state and is forcibly stirred forward by receiving the rotational propulsion force is irradiated with the above-mentioned heat rays to be carbonized and fired. At the same time, the raw material is carbonized and fired. The harmful exhaust gas generated from the reburned exhaust gas hollow ventilation passage is further sucked from one end side of the reburned exhaust gas hollow passage and recombusted, and the thermally decomposed harmless combustion gas is forcedly conducted inside the reburned exhaust gas hollow ventilation passage to heat it up to around 850 degrees. The structure is adopted by a rotary kiln type carbonization and firing method in which the above is continuously discharged from the other end.

The second feature of the method of the present invention is the rotary kiln type in which the reburnt exhaust gas hollow ventilation passage in the first feature of the above-mentioned method of the present invention is formed of a folded parallel combustion type medium wavelength infrared light emitting tube. It is in adopting the constitution of the carbonization and firing method.

A third feature of the method of the present invention is that the sealed rotating atmosphere in the first or second feature of the method of the present invention is internally formed by a rotary cylinder whose both ends are sealed.
This is due to the adoption of a rotary kiln-type carbonization and firing method.

The first feature of the device of the present invention is that a generated gas suction port is formed at one end in a rotary cylinder that is supported in a sealed and rotatable manner by fitting both ends over a pair of outside air-shielding shells that face each other. In the combustion chamber, a combustion type medium wavelength infrared light emitting tube that faces a combustion burner that is attached to the one outside air shielding shell is extended, and the other end is connected to an exhaust duct that penetrates the one outside air shielding shell. The adoption of the structure of a rotary kiln type carbonization firing device.

A second feature of the device of the present invention is that the rotary cylinder in the first feature of the device of the present invention is formed by lining a refractory material on the inner peripheral surface, and agitating shelves and advancing wings are provided in a protruding manner. The adoption of the structure of a rotary kiln type carbonization firing device.

A third feature of the device of the present invention is a rotary kiln type in which the combustion type mid-wavelength infrared light emitting tube of the first or second feature of the device of the present invention is formed in a folded and parallel shape. This is in adopting the constitution of the carbonization and firing device.

A fourth feature of the device of the present invention is that the combustion type medium wavelength infrared light emitting tube according to the first, second or third feature of the device of the present invention penetrates through the pair of outside air shielding shells. A rotary kiln-type carbonization and firing device is adopted, in which a group of horizontal beams are extended to both sides and are supported by jacket-type water-cooled support beams that pass water inside.

A fifth feature of the device of the present invention is that the combustion type medium wavelength infrared emitting tube in the first, second, third or fourth feature of the device of the present invention is located above the axis of the rotary cylinder. It is adopted in the configuration of a rotary kiln type carbonization and firing device that is extended along the line.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to the drawings with respect to an apparatus example and a method example.

(Device Example) FIG. 1 is a plan view of this device example, and FIG.
1 is a central longitudinal sectional view taken along line II-II in FIG. 1, FIG. 3 is a right end view of the present apparatus example, FIG. 4 is a longitudinal sectional view taken along line IV-IV in FIG. 1, and FIG. FIG.

In the figure, B is a rotary kiln type carbonization and firing apparatus of this apparatus example, 12 is a rotary cylinder, 13 is a combustion type medium wavelength infrared light emitting tube as a reburning exhaust gas hollow ventilation passage formed in parallel with two folded back, Reference numeral 14 is a water-cooled support beam that projects lateral beams 4a at equal intervals in the longitudinal direction on both sides and passes water through the inside like a jacket to support the entire length of the combustion type mid-wavelength infrared light emitting tube 13; object,
Reference numeral 16 denotes a combustion chamber formed at the start end of the combustion type medium wavelength infrared light emitting tube 13.

Numerals 17 'and 17 "are a pair of left and right sides which are opposed to each other to hermetically seal the left and right ends of the combustion type mid-wavelength infrared light emitting tube 13 and rotatably support each of them, and 18 are provided at equal intervals on the outer peripheral surface. A group of long-hole generated gas suction ports for sucking the exhaust gas into the combustion chamber 16; 19 is a finished product discharge port; and 20 is a burner beak port 2 which penetrates the right outside air shielding shell 17 ″.
It is a combustion burner with its 0a tip facing.

Reference numeral 21 denotes an outside air duct which penetrates the left outside air shielding shell 17 "and is connected to the end of the combustion type medium wavelength infrared light emitting tube 13, 22 a drive motor with a reduction gear, 23 a drive shaft, 24 drive wheels, 25 ', 25 ″ is a rotary wheel provided around the left and right outer periphery of the rotary cylinder 12, 26 is a raw material feeding hopper, 27 is an insertion pusher mechanism, 27a is a partition damper, 27b is a pusher block, 27c is a pusher rod, 28 is a base, 29 ′, 29 ″ is an open / close valve, 30 is a stirring rack, and 31 is a forward blade.

(Method Example 1) A method example of the present invention applied to the above apparatus example will be described with reference to the drawings. In FIG. 4, an apparatus B according to the present apparatus example is preferably provided with an exhaust gas combustion type medium wavelength infrared light emitting tube 13 made of stainless steel so as to extend in an upper hollow portion along an axis X of a rotary cylinder 12 made of steel. Thermal expansion of the exhaust gas combustion type mid-wavelength infrared light emitting cylinder 13,
The bending is supported by a water-cooled support beam 14 which penetrates the outside air shielding shell 17'17 ".

A wall of refractory material 15 is lined inside the rotary cylinder 12, and a shelf 30 for stirring the raw material is provided in the longitudinal direction, for example, 8
Partial construction is performed, and the forward wing 31 is attached as shown in FIG.

Prior to the operation, the combustion burner 20 is ignited, and the combustion type medium wavelength infrared light emitting tube 13 in which hot air is sent from the burner beak port 20a through the combustion chamber 16 has a heat ray having a wavelength of about 4 μm inside the rotary drum 12. 850 that can be dissipated
Heat up to near ℃ and place.

Next, the rotary wheel 12 is rotated by applying rotational torque to the rotary wheels 25 ′ and 25 ″ attached to the outer peripheral surface of the rotary cylinder 12 by the drive wheels 24, and the stirring rack 30 and the advancing vane 31 are used to move the inside. While stirring and advancing, the raw material sent to is subjected to dry carbonization and firing by receiving heat rays of medium-wavelength infrared rays from the medium-wavelength infrared ray emitting tube 13 whose temperature is controlled at about 850 ° C. Constant-temperature infrared rays are controlled. The temperature signal of a temperature sensor (not shown) provided in the light emitting cylinder 13 is input to a computer (not shown) which is separately prepared to adjust the heating power of the combustion burner 20.

Exhaust gas generated during the dry carbonization is sucked into the combustion chamber 16 through the generated gas suction port 18 provided in the outer cylinder of the combustion chamber 16 of the combustion chamber 16 and re-combusted by the flame of the combustion burner 20 to raise the temperature. Disassemble. This combustion heat is used as an infrared light emitting heat source of the medium wavelength infrared light emitting tube 13. Water-cooled support beam 1
Cold water is circulated in the inside of 4. The burning hot air passes through the medium-wavelength infrared light emitting cylinder 13 while recovering thermal energy, and is discharged through the exhaust duct 21.

In FIG. 2, a pair of outside air-shielding shells 17 ', 1 are provided on the base 28 at the left and right ends of the rotary drum 12 so as to face each other.
By 7 ″, the air inside and outside the rotary cylinder 12 is shielded so as to be in an oxygen-deficient state, and carbonized and fired.
7 is moved by the pusher rod 27c and put into the rotary drum 12. Partition damper 27a that slides when closing
With the material input hopper 26, the lower part of the hopper 26 is shielded and a fixed amount is input,
The product for which the carbonization and firing has been completed is continuously taken out of the furnace through the finished product outlet 19 in which the outside air is blocked by the opening / closing lid 19a.

[0031]

Since the present invention is constructed as described above, it has a compact structure, the manufacturing cost and the running cost of the whole device for the processing amount are reduced, the cost is reduced, and the maintenance relationship is simplified.

Since the heating of the raw material is a heat ray, the treatment time is shortened because the heating is performed by penetrating into the inside instead of the conventional heating and firing from the surface. Since various exhaust gases generated during firing of raw materials are simultaneously re-burned in the equipment at the same time, pollutants in exhaust gas can be completely removed.Because this energy is reused, it is a perfect energy-saving type. is there. The finished product has excellent effects such as effective utilization as a fertilizer, a soil conditioner, a road paving material, and the like.

[Brief description of drawings]

FIG. 1 is a plan view of a rotary kiln type carbonization and firing apparatus showing an embodiment of the present invention.

FIG. 2 is a front view showing an exhaust gas combustion type medium wavelength infrared light emitting tube installed in a rotary kiln type carbonization and calcination apparatus, and is a partial vertical cross-sectional view taken along the line II-II in FIG.

FIG. 3 is a right end view of the same.

FIG. 4 is a vertical sectional view taken along the line IV-IV in FIG.

FIG. 5 is an enlarged view of a longitudinal cross-sectional view of a part of the combustion chamber and its peripheral portion.

FIG. 6 is a horizontal cross-sectional view of a part of a conventional rotary kiln-type carbonization and calcination device with a part omitted.

[Explanation of symbols]

A, B ... Rotary kiln type carbonization firing equipment 1,12 ... Rotating body 2,25 ', 25 "... Rotating wheels 3 ... Combustion heating furnace 4,17 ', 17 "... Outside air shielding shell 5, 20 ... Combustion burner 6, 7 ... Exhaust gas pipe 8 ... Reburning chamber 9, 26 ... Raw material feeding hopper 10, 27 ... Insert pusher mechanism 11, 19 ... Carbonized finished product outlet 13 ... Exhaust gas combustion type mid-wavelength infrared light emitting tube 14 ... Water-cooled support beam 15 ... Refractory lining 16 ... Combustion chamber 19a ... Opening / closing lid 20a ... Burner beak 21 ... Exhaust duct 22 ... Drive motor with reduction gear 23 ... Drive shaft 24 ... Drive wheel 27a ... Partition damper 27b ... Pusher block 27c ... Pusher rod 28 ... Base 29 ', 29 "... on-off valve 30 ... stirring rack 31 ... Forward wings

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3K061 AA07 AB02 BA05 BA08 CA01                       FA02 FA21 KA02 KA13                 3K078 AA05 AA08 BA09 CA02 CA06                       CA09

Claims (8)

[Claims] 1. First, combustion air is sent into the inside from one end of a reburning exhaust gas hollow ventilation passage inserted and extended in a closed rotating atmosphere, the internal temperature is raised to around 850 ° C. and constant temperature control is performed,
A heat ray having a wavelength of about 4 μm is constantly dissipated in the sealed rotating atmosphere, and then fed into the sealed rotating atmosphere in an oxygen-deficient state, and a raw material that is forcibly advancing stirring by receiving a rotational driving force is irradiated with the heat ray. In parallel with this, the harmful exhaust gas generated from the raw material at the time of carbonization is further sucked from one end side of the reburned exhaust gas hollow ventilation passage and recombusted and pyrolyzed to produce harmless combustion gas. Is forcibly conducted through the inside of the re-combustion exhaust gas hollow ventilation passage to continue the heating up to around 850 degrees Celsius and discharge from the other end. 2. The rotary kiln-type carbonization and calcination method according to claim 1, wherein the reburned exhaust gas hollow ventilation passage is formed of a folded parallel combustion type medium wavelength infrared light emitting tube. 3. The rotary kiln-type carbonization and calcination method according to claim 1, wherein the closed rotary atmosphere is internally formed by a rotary cylinder whose both ends are closed. 4. A rotary cylinder rotatably supported in a sealed manner by inserting both end portions between a pair of external air shielding shells which face each other,
A combustion-type mid-wavelength infrared light emitting tube with a combustion burner that penetrates the one outside air shielding shell is extended in the combustion chamber with the generated gas suction port formed at one end, and the other outside air shielding shell is provided at the other end. A rotary kiln-type carbonization and firing device characterized by being connected to an exhaust duct that passes through. 5. The rotary kiln-type carbonization and firing apparatus according to claim 4, wherein the rotary cylinder is formed with a refractory material lined on the inner peripheral surface thereof, and is provided with a stirring rack and a forward blade. 6. The rotary kiln type carbonization and firing apparatus according to claim 4 or 5, wherein the combustion type medium wavelength infrared light emitting tube is formed in a folded and parallel shape. 7. The combustion type medium wavelength infrared light emitting tube penetrates through the pair of outside air shielding shells, projects lateral beam groups on both sides, and is supported by a jacket-type water-cooled support beam that allows water to pass inside. The rotary kiln-type carbonization and firing device according to claim 4, 5 or 6, characterized in that. 8. The rotary kiln type carbonization according to claim 4, 5, 6 or 7, wherein the combustion type medium wavelength infrared light emitting tube is extended along an upper axis of the rotary cylinder. Baking equipment.