JP2002012875A - Apparatus for carbonizing and reducing scrap wood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for efficiently carbonizing scrap wood at a low cost capable of reducing combustion air and gaseous carbon dioxide and providing a by-product from the scrap wood in relation to an incineration device for the scrap wood. SOLUTION: This apparatus for carbonizing and reducing the scrap wood is equipped with a crusher for crushing the scrap wood and feeding the crushed scrap wood, a feed hopper, a circular cylindrical or a prismatic radiant heating cylinder supported parallel to a rotating drum, a heating peripheral chamber surrounding the outer periphery of the rotating drum, a combustion chamber receiving the feeding of a reducing gas from an exhaust pipe, a combustion gas duct for passing the combustion gas discharged from the combustion chamber in series to the heating peripheral chamber and radiant heating cylinder and a weighing and bagging device for the discharged carbonized material and capable of carrying out the carbonization and reduction of the scrap wood under a high-temperature reducing atmosphere by complete indirect heating with radiation and thermal conduction in the apparatus for carbonizing and reducing the scrap wood provided with the rotating drum and the exhaust pipe for the reducing gas in the rotating drum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incinerator for waste wood typified by waste wood generated when a wooden house is dismantled, and more particularly to drying and carbonizing waste wood and decomposing harmful substances such as dioxin in a reducing atmosphere. The present invention relates to the above-mentioned device provided with a heating means suitable for performing the heating.

[0002]

2. Description of the Related Art Waste wood is mostly landfilled or incinerated in a stable disposal site. However, it is difficult to secure a landfill site and environmental destruction around the disposal site is a problem. In landfill, the problem is big. In addition, ordinary incineration requires a large amount of combustion air (oxygen in the air is 2%).
1% and an excess air ratio of about 1.8 times), which generates a large amount of combustion exhaust gas, generates a large amount of carbon dioxide gas that causes global warming, and generates harmful secondary gases. A product is generated, and an exhaust gas treatment device for removing the product is complicated, which is disadvantageous in cost.

[0003]

SUMMARY OF THE INVENTION The present invention is intended to reduce waste air and carbon dioxide by drying waste wood, heating it to a higher temperature, and carbonizing and reducing it without generating odor or harmful gas. The goal is to obtain a device that can obtain by-products from waste wood. By combusting combustible reducing gas generated during carbonization and indirect heating, carbonization and reduction can be performed efficiently and at low cost. It is an object of the present invention to obtain an apparatus for carbonizing and reducing waste wood provided with a heating means capable of heating waste wood to a temperature.

[0004]

According to the first aspect of the present invention, there is provided an apparatus for carbonizing and reducing waste wood, comprising a rotating drum 2 supported at a slight inclination from a horizontal axis, and a fixed supply-side partition for closing both ends of the rotating drum. 3 and a discharge-side partition 4, an exhaust pipe 31 for reducing gas, a feeder 28 that passes through the supply-side partition 3 and supplies waste wood into the rotary drum 2, and a discharge port 3 that opens at the bottom of the discharge-side partition 4.
In a carbonization and reduction device for waste wood provided with a discharge conveyor 34 communicating with the feeder 3, a crusher 48 and a supply hopper 50 for crushing waste wood and supplying it to the feeder 28, and a supply-side partition 3 and a discharge-side partition 4 are provided. A cylindrical or polygonal radiant heating cylinder 5 that penetrates and is supported by the partition walls 3 and 4 in parallel with the rotary drum 2, a heating peripheral chamber 10 surrounding the outer circumference of the rotary drum 2, A combustion chamber 15 to be supplied, an auxiliary burner 44 provided in the combustion chamber, combustion gas ducts 11 and 25 for passing combustion gas discharged from the combustion chamber through the heating peripheral chamber and the radiant heating cylinder in series, Measuring bagging device 55, 56 for carbide discharged from conveyor 34
And carbonizing and reducing waste wood in a high-temperature reducing atmosphere by complete indirect heating of radiation and heat conduction.

According to a second aspect of the present invention, in the waste wood carbonizing and reducing apparatus according to the first aspect, the heating peripheral chamber 10 is located upstream of the combustion gas duct 11 connecting the peripheral chamber and the radiation heating cylinder 5. It is characterized by doing.

According to a third aspect of the present invention, in the apparatus for carbonizing and reducing waste wood according to the first or second aspect, the reducing gas discharged from the exhaust gas exhaust pipe 31 is a wood vinegar extractor 4.
1 and is supplied to the combustion chamber 15.

[0007]

According to the waste wood carbonizing and reducing apparatus of the present invention,
It is possible to consistently carry out the processing from waste material generated by demolition of wooden buildings to the production of by-products, and by minimizing combustion, it is possible to reduce the amount of combustion air and carbon dioxide emissions, High-temperature combustion prevents generation of harmful substances. By crushing before carbonization and reduction, efficient carbonization and reduction treatment is possible, the particle size of the obtained by-products is constant, and high-quality by-products used as fuel, humidity control material, soil conditioner, etc. Things are obtained.

The waste wood 36 supplied into the rotary drum 2 by the feeder 28 by the rotation of the rotary drum 2 whose axis is inclined.
Is slowly transferred to the discharge side while being stirred. At the start of operation, a combustion gas for heating is generated by an auxiliary burner 44 attached to the combustion chamber, and when the waste wood is carbonized to generate a reducing gas, the auxiliary combustion burner is gradually squeezed to burn the reducing gas. To heat the rotating drum 2.

The waste wood 36 is heated mainly by heat conduction and radiation from the heating peripheral chamber 10 while moving in the upstream portion in the rotary drum 2, and water evaporates from the outer surface and dries. Waste wood whose outer surface has dried is mainly
And further carbonized and reduced by the radiant heat from

The reducing gas generated by the carbonization / reduction is supplied to the combustion chamber 15 and completely burned, and the combustion gas is used for drying and carbonizing / reducing the waste wood 36. In addition, the water inside the waste wood evaporates due to the carbonization and reduction, and the carbonization and reduction proceeds, and the water is slowly transferred to the discharge side while being stirred with the rotation of the rotary drum 2, and the remaining carbide is discharged through the discharge port 33. It is carried out by the discharge conveyer 34. During the carry-out process by the discharge conveyor 34, the carbide is cooled.

In the apparatus of the present invention, the reducing gas generated during carbonization and reduction is burned, and the waste wood is heated by heat conduction and radiation from the outside of the rotating body by the high-temperature combustion gas. The thermal efficiency at the time of carbonization and reduction is increased by indirect heating from both inside and outside of the rotating drum, in which the radiant heat from the installed radiant heating tube is heated from the inside.
The combustion gas discharged from the heating cylinder is supplied to the cyclone dust collector 1
9 and the like, and then the exhaust gas fan 14 passes through the chimney 24
Emitted from the atmosphere.

Since the waste wood itself is not burned at all, the yield is good. By controlling the auxiliary burner 44 in the combustion chamber, the inside of the rotary drum can be heated to a high temperature required for carbonization and reduction, and the carbonization and reduction can be performed. Temperature can be accurately maintained at the desired temperature. In addition, uniform drying and carbonization / reduction can be performed by the stirring action of the rotation of the rotary drum 2.

If a screw feeder and a screw conveyor are used as the feeder 28 and the discharge conveyor 34, waste wood and carbides are filled and conveyed inside the conveyor, so that the space of the feeder and the discharge conveyor can be used without using a special sealing device. The air can be prevented from flowing into the rotary drum through the rotary drum. During carbonization and reduction,
In order to prevent the inflow of air, the inside of the furnace is maintained at a slightly positive pressure.

[0014]

Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. 1 is a cross-sectional view showing one embodiment of a rotary furnace, FIG. 2 is a block diagram showing one embodiment of an apparatus for woody waste wood, and FIG. 3 is a more specific view of the apparatus of FIG. 2 including the rotary furnace of FIG. It is a top view which shows a general shape.

The rotary furnace 1 comprises a rotary drum 2, a supply-side and discharge-side partition walls 3, 4, and a heating peripheral chamber 10 surrounding the peripheral wall of the rotary drum.
And a radiant heating cylinder 5, and a combustion gas duct 11 connecting the heating peripheral chamber 10 and the radiant heating cylinder 5. Rotating body 2
Has thick flanges 6 on both sides. By supporting the flanges 6 with rollers 8 (8a, 8b) provided on a gantry 7,
It is rotatably supported. The roller 8 has a slightly higher position on the waste material supply side 8a, and therefore the rotating drum 2 is inclined so as to be slightly lower from the supply side to the discharge side.
A sprocket 9 is also fixed to the rotary drum 2, and the rotary drum 2 is rotationally driven by connecting a sprocket with an electric motor (not shown) mounted on the gantry 7 by a chain.

The supply-side partition wall 3 and the discharge-side partition wall 4 for closing both ends of the rotary drum 2 are fixedly provided on a gantry 7.
Between the supply-side partition 3 and the discharge-side partition 4 and the rotary drum 2,
Rotary seals 16 and 17 are provided to prevent gas leakage from the furnace. An axially elongated scraping blade for scraping waste wood is mounted on the inner surface of the rotating drum 2.

The portion of the rotary drum 2 between the flanges 6 supported by the rollers 8 is surrounded by a heat insulating wall 12 which forms a cylindrical heating peripheral chamber 10 between itself and the rotary drum. In the heating peripheral chamber 10,
Rotation seals 16 and 17 for preventing the inflow of the atmosphere are provided at the sliding contact between both ends of the heat insulating wall 12 and the rotary drum 2 due to a slight negative pressure due to the suction of the exhaust gas fan 14 described in FIG. ing. The end of the heating peripheral chamber 10 on the waste material supply side is connected to the combustion chamber 15 shown in FIG.

A cylindrical radiant heating cylinder 5 is provided inside the rotary drum 2 in parallel with its axis. Radiation heating tube 5
Are supported in a state where both ends thereof pass through heating cylinder mounting holes 20 and 21 provided in the supply-side partition 3 and the discharge-side partition 4. The end of the radiant heating cylinder 5 on the waste material discharge side is connected to the end of the heating peripheral chamber 10 on the waste material discharge side by a combustion gas duct 11, and the end on the waste material supply side is connected by an exhaust gas duct 18. It is connected to the cyclone dust collector 19 of FIG.

A screw feeder 28 provided with a stirring hopper 27 at the base end is provided on the gantry 7 on the supply side of the rotary furnace 1, and the tip of the feeder penetrates the supply side partition 3 of the rotary furnace. Opening in the rotating drum 2. The stirring hopper 27 is provided with a rotary stirring blade 29 for stirring waste wood supplied to the rotary furnace 1 so that uniform waste wood is continuously supplied to the rotary furnace. . Also,
At an intermediate portion of the screw feeder 28, a steam outlet 30 for opening steam generated from waste wood by heating is opened. In order to secure an arrangement space for the screw feeder 28, the heating cylinder 5 is slightly deviated from the center of the rotary drum 2 as shown in FIGS.

The supply-side partition 3 is provided with a reducing gas exhaust pipe 31 communicating with the inside of the rotary furnace at the upper part. Discharge side bulkhead 4
Has a vacant space 32 in which a refractory material layer 13 is provided on a wall surface, and a discharge-side end of the rotary drum 2 is supported while being slightly inserted into the vacant space. A discharge port 33 is provided at the lower end of the empty room 32, and a discharge screw conveyor 34 is connected to this discharge port. Screw conveyor 3 for discharge
4 discharges the carbide falling from the discharge port 33. The discharge-side partition 4 is provided with a non-combustible gas supply port 35 communicating with the inside of the furnace.

Next, the peripheral devices of the rotary furnace 1 will be described with reference to FIGS. Screw feeder 28 for supplying waste wood and screw conveyor 34 for discharging carbide
Are provided with water jackets 38 and 39, and cooling is performed by passing water through the water jackets.

The exhaust pipe 31 for the reducing gas is connected to the combustion chamber 15 via a wood vinegar liquid extracting device 41 by a reducing gas duct 40. The wood vinegar liquid extraction device 41 has a water supply pipe 4
2 and the drain pipe 43 are connected. An auxiliary burner 44 is provided in the combustion chamber 15, and fuel is supplied to the auxiliary burner from a kerosene tank 45 by an oil pump 46. The combustion gas in the combustion chamber 15 is supplied to a combustion gas duct 25.
At the end of the heating peripheral chamber 10 on the waste material supply side.

At the start of operation, a large amount of kerosene is supplied to the auxiliary combustion burner 44 and the combustion gas is used to rotate the rotary furnace 1.
Heat. When operation reaches a steady state, the rotary furnace is heated using reducing gas generated from waste wood as the main fuel,
The temperature of the rotary furnace 1 is maintained constant by supplementing the insufficient heat with the auxiliary burner 44 and controlling the amount of combustion of the auxiliary burner 44.

The combustion gas that has passed through the heating peripheral chamber 10 and the radiant heating cylinder 5 passes through an exhaust gas duct 18 so that the cyclone dust collector 1
9, is mixed with fresh air sucked from an outside air suction port 23 provided with a damper 22, is sucked by an exhaust gas fan 14, and is discharged to the atmosphere through a chimney 24.

At the upstream side of the stirring hopper 27, a crusher 48,
A crushed product conveyor 49, a receiving hopper 50, and a supply conveyor 51 are arranged. Demolition wood chips generated when the wooden house is dismantled are crushed to a desired particle size by a crusher 48, and then supplied to a receiving hopper 50 by a crushed product conveyor 49. The crushed wood chips are temporarily stored in the receiving hopper 50, sent out to the supply conveyor 51 by the metering conveyor 52 by a fixed amount, and conveyed to the stirring hopper 27.

The carbide discharged from the discharge conveyor 34 is stored in a product tank 54 by a product conveyor 58 via a rotary valve 53. Below the product tank 54, a weighing machine 55, a bag stuffing machine 56, and a sealing machine 57 are arranged, and the carbide falling from the product tank 54 is measured by a predetermined amount by the weighing machine 55, and the inside of the bag stuffing machine 56 is measured. Is put into the waiting bag, and the bag is sealed by the sealing machine 57, so that a predetermined amount of packed carbide is obtained.

Wood chips generated by dismantling a wooden house or the like are first introduced into a crusher 48 to be crushed to a predetermined particle size, and then introduced into the stirring hopper 27 by a predetermined amount.
By 8, it is sent into the rotating drum 2. The rotary drum 2 is driven to rotate slowly. The reducing gas discharged from the rotating drum 2 is completely combusted in the combustion chamber, and the high temperature and the combustion gas generated thereby heat the rotating drum first from the outside, and further, the combustion gas is radiated in the rotating drum. The waste wood in the rotating drum 2 is heated by radiant heat generated when passing through the heating cylinder, and carbonizes and reduces the waste wood. The carbonization / reduction temperature is controlled by an auxiliary burner in the combustion chamber. By the rotation of the rotary drum 2, the waste wood in the rotary drum is stirred so that the bottom one is scraped up to the upper layer, and is uniformly carbonized and reduced in a non-oxidizing atmosphere.

Due to the inclination of the rotary drum 2, the waste wood in the rotary drum moves to the discharge side while being stirred. Then, the waste wood that has moved into the empty room 32 of the discharge-side partition wall falls through the discharge port 33 and is discharged by the discharge screw conveyor 34.

According to the apparatus of the present invention, as described in the above embodiment, waste wood continuously supplied from the feeder is
It is carbonized and reduced in a rotary furnace, and is continuously discharged by a discharge conveyor. The waste wood can be uniformly carbonized and reduced, and the control of the carbonization and reduction temperature is easy. Further, by employing the heating device having the structure of the present invention, high-temperature heating can be performed, carbonization and reduction can be accurately controlled, thermal efficiency can be improved, and running costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a rotary furnace according to an embodiment.

FIG. 2 is a block diagram showing the entire apparatus of the embodiment.

FIG. 3 is an overall plan view of the apparatus according to the embodiment.

[Explanation of symbols]

 2 Rotary barrel 3 Supply side partition 4 Discharge side partition 5 Radiant heating cylinder 10 Heating peripheral chamber 11 Combustion gas duct 15 Combustion chamber 25 Combustion gas duct 28 Supply screw feeder 31 Reducing gas exhaust cylinder 33 Carbide discharge port 34 Discharge screw conveyor 41 Wood vinegar Extractor 44 Burner burner 48 Crusher 50 Receiving hopper 55 Weighing machine 56 Bag filling machine

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yuji Mizukoshi 7 Kannondo-cho, Kanazawa City, Ishikawa Prefecture Actry Murata F-term (reference) 4D004 AA12 BA03 CA04 CA26 CA27 CA42 CB09 CB13 CB46 DA02 DA06 4H012 JA03 JA12

Claims (3)

[Claims] 1. A rotary drum supported slightly inclined from a horizontal axis.
(2) and a fixed supply-side partition that closes both ends of this rotary drum
(3) and a discharge-side partition (4), an exhaust pipe (31) for reducing gas, and a feeder (28) for supplying waste wood into the rotating drum (2) through the supply-side partition (3), In a waste wood carbonization and reduction device provided with a discharge conveyor (34) communicating with a discharge port (33) opened at the bottom of the discharge side bulkhead (4), the waste wood is crushed and fed.
8) The crusher (48) and the supply hopper (50) to be supplied to the feeder bulkhead (3) and the discharge bulkhead (4) through the bulkheads (3, 4).
A cylindrical or polygonal radiant heating cylinder (5) supported in parallel with the rotating drum (2), and a heating chamber (10) surrounding the outer circumference of the rotating drum (2)
A combustion chamber (15) receiving a supply of reducing gas from the exhaust stack
A combustion burner (44) provided in the combustion chamber, a combustion gas duct (11, 25) for passing combustion gas discharged from the combustion chamber in series through the heating peripheral chamber and the radiant heating cylinder, and a discharge conveyor ( Weighing device (5)
5,56), a carbonization and reduction device for waste wood. 2. The heating peripheral chamber (10) is composed of the peripheral chamber and a radiation heating cylinder.
The waste wood carbonizing / reducing device according to claim 1, wherein the device is located upstream of a combustion gas duct (11) connecting the waste gas to the waste gas. 3. The method according to claim 1, wherein the reducing gas discharged from the exhaust pipe of the reducing gas is supplied to the combustion chamber via the wood vinegar extractor. Waste wood carbonization and reduction equipment.