JPH10330760A - Continuous carbonization process for organic waste and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carbonize an org. waste continuously without generating smoke and an odor and to recycle the resultant carbonization product. SOLUTION: An org. waste such as garbage is dried in a drying oven 1 by utilizing an exhaust gas heat of deodorizing oven 13 and then is sent into a carbonization oven 6 where to be carbonized by heating with the exhaust gas heat from the deodorizing oven 13. Various volatile components generated in the drying oven 1 and the carbonization oven 6 is thermally decomposed in the deodorizing oven 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for carbonizing organic waste in a continuous manner.

[0002]

2. Description of the Related Art An incineration method is generally used as a method of treating garbage and other organic wastes. However, this incineration method involves a problem of smoke exhaustion, a problem of odor, etc. There are many problems besides treatment facilities. The ash remaining after incineration is hardly reused due to cost and other problems.

Therefore, recently, a method has been proposed in which organic wastes such as garbage are heated under low oxygen and carbonized.

A. JP-A-8-5036 discloses a waste treatment method disclosed in this publication in which waste composed of organic substances is heated in an oxygen-deficient state and carbonized. This is a method for continuously treating waste in this furnace by providing a discharge section for carbonized residue at the bottom of the furnace.

B. JP-A-6-122879. The method and apparatus for carbonizing water-containing organic substances described in this publication have a heat radiation source on the ceiling surface, and charge the organic substances from one end of a drying furnace in which the inside of the furnace is in an oxygen-deficient state. After being dried, it is carbonized in a high-temperature charcoal furnace.

[0006]

However, a. b.
The carbonization method and apparatus described in (1) have the following disadvantages. 1. Processing capacity is small and processing speed is slow. 2. Heat is not being used effectively. 3. Smoke and deodorization are not sufficient. 4. Large compared to throughput.

A first object of the present invention is to propose a method and an apparatus which can process organic waste continuously and in large quantities at a high speed. A second object of the present invention is to increase the effective rate of heat. Further, a third object of the present invention is to sufficiently remove various evaporation components including an odor and the like.

[0008]

The constitution of the present invention proposed to achieve the above object is as follows. 1. The organic waste is recovered by exhaust heat from the deodorization furnace, dried by the exhaust heat, and the dried organic waste is guided to a carbonization furnace and heated by the exhaust heat from the deodorization furnace to perform a carbonization process. A method for continuously carbonizing organic waste, wherein various evaporation components generated in the drying furnace and the carbonizing furnace are introduced into the deodorizing furnace and thermally decomposed at a high temperature.

[0009] 2. Transport means for transporting the organic waste input from the hopper toward the outlet therein, a drying furnace incorporating heating means for heating the organic waste during the transport, and an inlet to an outlet therein Conveying means for conveying the organic waste dried in the drying furnace toward, and a carbonizing furnace incorporating a heating means for heating the organic waste with exhaust heat from a deodorizing furnace; and A carrying means for carrying dried organic waste sent out of the drying furnace into the carbonizing furnace, between the furnace outlet and the carbonizing furnace inlet;
A deodorizing furnace that introduces various evaporation components discharged from the drying furnace and the carbonizing furnace to perform thermal decomposition, and a carbonizing heat transfer unit that transfers high-temperature exhaust heat discharged from the deodorizing furnace to the carbonizing furnace. A heating medium circulating means for circulating a heat medium exchanged by high-temperature exhaust heat discharged from the deodorizing furnace into a heating means in the drying furnace; and various evaporation components generated in the drying furnace and the carbonizing furnace. And an evaporating component introduction line for guiding the organic waste into the deodorizing furnace.

[0010] 3. 3. The continuous carbonization apparatus for organic waste according to the above item 2, wherein a rotary valve is attached between the hopper and the inlet of the drying furnace and at the outlet of the carbonizing furnace. 4. The high-temperature exhaust heat discharged from the deodorizing furnace is guided to a heat exchanger to heat hot water as a heat medium, and the heated heat medium is passed through a drying heat medium circulating means into a heating means in the drying furnace. 3. The continuous carbonization apparatus for organic waste according to the item 2, wherein the apparatus is configured to circulate.

5. 5. The continuous carbonization apparatus for organic waste according to claim 4, wherein the heat medium is a gas. 6. 6. The continuous carbonization apparatus for organic waste according to the above item 2, 3 or 4 or 5, wherein a burner is mounted in the deodorizing furnace, and the high-temperature combustion gas generated by the burner is configured to thermally decompose various evaporation components. .

[0012]

When organic waste such as garbage is put into the drying furnace from the hopper, the garbage is moved to the outlet side by the transport means in the drying furnace. During this movement, the garbage is indirectly heated by the heat medium introduced into the drying oven, and the moisture evaporates. The garbage in which the water is evaporated and dried in this manner is sent from the outlet of the drying furnace into the carbonization furnace via the carrying-in means, and is transported through the carbonization furnace by the transportation means. It is indirectly heated again by heat transferred from the deodorizing furnace by the heat transfer means for carbonization via the heat exchanger.
At this time, since the inside of the carbonization furnace is adjusted to have an oxygen-free concentration, the garbage is carbonized. The garbage thus carbonized is discharged from a discharge port provided in a part of the carbonization furnace.

The various evaporation components generated in the drying furnace and the carbonization furnace are introduced into the deodorizing furnace by an exhaust gas introduction line, where they are heated by the high-temperature combustion gas generated by the burner and thermally decomposed. It is discharged from the vessel through the carbonization furnace into the atmosphere.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is characterized in that organic waste such as garbage is continuously fed through a hopper, followed by a drying step and a carbonizing step.

That is, the material to be treated such as garbage thrown in from the hopper enters the drying oven via the rotary valve, and is conveyed by the conveying means at about 130 ° C. to 135 ° C. while being conveyed by the conveying means. It is indirectly heated with a heat medium and dried. Next, the object to be treated enters the carbonization furnace from the carrying-in means,
While being conveyed by the conveying means in the carbonization furnace, the heating means indirectly heats the exhaust gas at about 450 ° C. to 500 ° C. to carbonize. This carbide is discharged out of the carbonization furnace via a rotary valve.

The various evaporating components in the drying furnace and the carbonizing furnace generated by the above-mentioned heating are led to a deodorizing furnace to be heated to about 800 ° C.
Pyrolyzed by combustion gas at ~ 850 ° C. The exhaust gas discharged from the deodorizing furnace is guided to a heat exchanger, where it applies heat to a heating medium circulating in a heating means in the drying furnace, and then passes through the heating means in the carbonizing furnace as described above. Is released into the atmosphere.

On the other hand, the heat medium heated by the heat exchanger circulates through the heating means in the drying furnace through the heat medium circulation line to give heat to the object to be processed and to dry it. The carbonization furnace
Carbonization is performed by heating the workpiece in an oxygen-free state. By controlling the heating temperature and / or the transport speed, it is possible to operate so that the workpiece is discharged before carbonization. It is.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A carbonization method and apparatus according to the present invention will be described with reference to FIG. Reference numeral 1 denotes a drying furnace, which has a double structure of an inner cylinder 1a and an outer cylinder 1b, a screw feeder 3 is incorporated in the inner cylinder 1a, a hopper 2 and a rotary valve. The garbage put into the furnace via 2a is sent out in the direction of the outlet 4 with stirring, and during this time, circulates in the hot water jacket 5 as an example of a heating means formed between the inner cylinder 1a and the outer cylinder 1b. It is configured to indirectly heat with hot water heat to evaporate water.

Reference numeral 6 denotes a carbonization furnace, which has a double structure of an inner cylinder 6a and an outer cylinder 6b, and a screw feeder 7 is incorporated in the inner cylinder 6a. The garbage sent into the carbonization furnace 6 from the outlet 4 through the workpiece loading means 12 and the inlet 8 is sent out toward the outlet 9 while being stirred by the screw feeder 7, and during this time, the inner cylinder 6a is It is configured to indirectly heat and carbonize with exhaust gas conveyed from a heat exchanger described later introduced into a heating section 6c as a heating means formed by the cylinder 6b. The exhaust gas discharged from the heating unit 6c of the carbonization furnace 6 is discharged into the atmosphere via an exhaust gas discharge line 27. Since the exhaust gas discharged from the carbonization furnace 6 has been subjected to the thermal decomposition treatment in the deodorization furnace 13, the odorous components and the like have been removed.

The carbide is supplied to the rotary valve 1 through the outlet 9.
0 is discharged to the receiving tray 11. Reference numeral 13 denotes a deodorizing furnace to which a gas burner 14 and an air line 15 are attached. Various evaporating components generated in the drying furnace 1 and the carbonizing furnace 6 are introduced into the deodorizing furnace 13 through a thermal decomposition processing line 1a. The gas burner 14 is configured to be thermally decomposed by the combustion gas. Reference numeral 20 denotes a blower for sucking various evaporation components from the inside of the carbonization furnace 6 and sending them into the deodorization furnace 13. An air line 15 feeds fresh air into the deodorizing furnace 13 to promote thermal decomposition.

A heat exchanger 16 heats hot water circulated in a hot water circulation line 17 by a pump 21 using exhaust gas from the deodorizing furnace 13. The hot water heated by the heat exchanger 16 is supplied to a drying furnace. The garbage is dried by circulating in the warm water jacket 5 in 1.

Reference numeral 18 denotes an exhaust gas line connecting the heat exchanger 16 and the carbonization furnace 6, reference numeral 22 denotes a water supply line connected to the hot water circulation line 17, reference numeral 23 denotes a safety valve, reference numeral 24 denotes a temperature stratification tank, reference numeral 25 denotes a thermal expansion absorption tank, and reference numeral 26 denotes a thermal expansion absorption tank. It is an automatic vent valve. In addition,
In the embodiment, the screw feeders 3 and 7 are incorporated in the drying furnace 1 and the carbonizing furnace 6, but may be replaced with a feeder with a crushing function or a screw kiln.

[0023]

The structure and operation of the carbonizing method and apparatus according to the present invention are as described above, and the following effects are obtained. a. It is possible to shorten the carbonization time and adjust the processing time and / or temperature, because the material to be processed is not dried directly in the drying furnace but is charged and carbonized before being directly charged into the carbonization furnace. Thus, the processed product can be taken out as a dried product. b. Since the exhaust heat of the deodorizing furnace is used as a heat source for the drying furnace and the carbonizing furnace, there is no waste of heat (energy).

C. In the deodorizing furnace, since various evaporation components are thermally decomposed with the combustion gas of the burner, no odor components or the like remain in the exhaust gas. d. The continuous carbonization process is possible by making all the processes from the hopper through the drying furnace to the carbonization furnace continuous.

E. By installing a rotary valve between the hopper and the inlet of the drying furnace and the outlet of the carbonizing furnace,
The inside of the drying furnace and the inside of the carbonizing furnace can be isolated from the atmosphere, and the insides of both the furnaces can be kept oxygen-free. f. The carbide can be used for charcoal, fuel, soil improvement, and the like. g. Since the apparatus is continuously carbonized, the processing capacity per unit time is high, and the size can be reduced accordingly.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an organic waste carbonization apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drying furnace 2 Hopper 2a Rotary valve 3 Screw feeder 4 Outlet 5 Hot water jacket 6 Carbonization furnace 6c Heating part 7 Screw feeder 8 Inlet 9 Outlet 10 Rotary valve 11 Receiving tray 12 Workpiece carrying means 13 Deodorizing furnace 14 Gas burner 15 Air line 16 Heat Exchanger 17 Hot water circulation line 18 Exhaust gas line 19 Pyrolysis treatment line 20 Blower 21 Pump 22 Water supply line 23 Safety valve 24 Temperature stratification tank 25 Thermal expansion absorption tank 26 Automatic air vent valve 27 Exhaust gas discharge line

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tatsuo Okabe 4-8-13 Okamura, Isogo-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Shinji Ito 4-13-21 Nakameguro, Meguro-ku, Tokyo Urban Heights A-701 ( 72) Inventor Fumio Takashima 4-15-4-603 Higashikomagata, Sumida-ku, Tokyo (72) Inventor Mitsuyoshi Takahashi 2-8-13 Kitajojiya, Ota-ku, Tokyo Inside Takamitsu Industry Co., Ltd. (72) Inventor Kei Watanabe Tochigi 94-2 Otsukicho, Ashikaga City Akaishi Industry Co., Ltd.

Claims (6)

[Claims] 1. The organic waste is recovered by exhaust heat from a deodorizing furnace, dried by the exhaust heat, and the dried organic waste is guided to a carbonization furnace and heated by the exhaust heat from the deodorizing furnace. A method for continuously carbonizing organic wastes in which a carbonization treatment is performed thereby, and various evaporation components generated in the drying furnace and the carbonization furnace are introduced into the deodorization furnace and thermally decomposed at a high temperature. 2. A transporting means for transporting organic waste introduced from a hopper toward an outlet therein, a drying furnace incorporating heating means for heating the organic waste during transporting, and A carbonization device incorporating therein a transporting means for transporting organic waste dried in the drying furnace from an inlet to an outlet and a heating means for heating the organic waste with exhaust heat from a deodorizing furnace. A furnace, between the outlet of the drying furnace and the inlet of the carbonizing furnace, a loading means for transporting the dried organic waste sent from the drying furnace into the carbonizing furnace, and discharged from the drying furnace and the carbonizing furnace. A deodorizing furnace that introduces various evaporation components to perform thermal decomposition; a heat transfer means for carbonizing that transfers high-temperature exhaust heat discharged from the deodorizing furnace into the carbonizing furnace; and a high-temperature exhaust heat discharged from the deodorizing furnace. The heat medium that has been heat-exchanged in A heating medium circulating means for drying circulating in a heating means in the furnace; and an evaporating component introduction line for guiding various evaporating components generated in the drying furnace and the carbonizing furnace into the deodorizing furnace. Continuous carbonization equipment. 3. The continuous carbonization apparatus for organic waste according to claim 2, wherein a rotary valve is attached between the hopper and the inlet of the drying furnace and at the outlet of the carbonizing furnace. 4. A high-temperature exhaust heat discharged from a deodorizing furnace is guided to a heat exchanger to heat hot water as a heat medium, and the heated heat medium is passed through a drying heat medium circulating means to be heated in a drying furnace. 3. The continuous carbonization apparatus for organic waste according to claim 2, wherein the apparatus is configured to circulate in the heating means. 5. The continuous carbonization apparatus for organic waste according to claim 4, wherein the heat medium is a gas. 6. The organic waste according to claim 2, wherein a burner is installed in the deodorizing furnace, and the high-temperature combustion gas generated from the burner is used to thermally decompose various evaporation components. Continuous carbonization equipment.