JPH09196333A - Waste pyrolysis drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable adhered substances adhered to the inner surface of a gas pipe for dry distillation gas to be cleaned even during an operation of pyrolysis. SOLUTION: There is provided a waste pyrolysis drum in which some wastes are indirectly heated with heating air, the wastes are thermally decomposed into dry distillation gas G1 and pyrolysis residues, the pyrolysis residues are separated into ignited substances and non-ignited substances, then discharged and concurrently the dry distillation gas G1 is fed out to a burner 11 of a melting furnace 9 through a gas pipe L3, wherein the gas pipe L3 is provided with a cleaning mechanism 60 comprised of a cleaning member 40 for cleaning off the adhered substances such as carbon, tar or the like at the inner surface in such a way that they may be freely inserted thereby and a fixing part 50 of the cleaning member 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal decomposition treatment of waste, and in particular, it is suitable for cleaning a thermal decomposition gas (dry distillation gas) to remove deposits such as carbon deposited in a gas pipe. Regarding the disassembly drum.

[0002]

2. Description of the Related Art Conventionally, as one of apparatuses for treating industrial waste including general waste such as municipal waste and combustible materials such as waste plastic, the waste is put into a pyrolysis reactor and heated in a low oxygen atmosphere. To produce a carbonized gas and a pyrolysis residue mainly composed of non-volatile components. After further cooling the pyrolysis residue, the pyrolysis residue is led to a separator, where the combustible component and, for example, metal And separated into non-combustible components consisting of debris such as porcelain, porcelain, gravel, concrete fragments, etc. There is known a waste treatment apparatus in which combustion ash generated by burning in a furnace is converted into molten slag, and the molten slag is discharged and solidified by cooling (for example, see JP-A-1-49816).

In the waste pyrolysis drum, a rotary drum having a heat transfer tube as a heat transfer surface for indirect heating is usually used. However, the waste supplied to the waste pyrolysis drum is heated. 300 ° C in a low oxygen atmosphere with air
It is decomposed by heating at 600 ° C., usually about 450 ° C. to generate a dry distillation gas and a thermal decomposition residue, and the dry distillation gas and the thermal decomposition residue are decomposed in an exhaust device, and the dry distillation gas is passed through a gas pipe. This is a configuration that leads to the burner of the melting furnace.

[0004]

By the way, in the conventional waste thermal decomposition drum as described above, a part of the thermal decomposition residue, specifically, a part of fine carbon and ash is carbonized gas. It is introduced into the burner of the melting furnace through the gas pipes, and part of this or tar contained in the carbonization gas may adhere to the gas pipes, adversely affecting the flow of carbonization gas. was there.

An object of the present invention is to provide a waste pyrolysis drum capable of cleaning deposits adhering to the inner surface of a gas pipe for dry distillation gas even during operation.

[0006]

In order to achieve the above-mentioned object, the waste pyrolysis drum according to the present invention indirectly heats the waste with heated air to pyrolyze the waste to pyrolyze it with pyrolysis gas. Waste pyrolysis drum that produces a residue, separates the pyrolysis residue into combustible components and non-combustible components and discharges it, and also discharges the dry distillation gas to the burner of the melting furnace via a gas pipe. In the above, the gas pipe is provided with a cleaning mechanism including a cleaning tool for cleaning the adhered matter on the inner surface so as to be inserted therethrough, and a cleaning mechanism.

The cleaning tool has a wire having a predetermined length and a tip formed so as to be in contact with the inner surface of the gas pipe, a drive unit for moving the wire in the length direction, and a drive unit and the wire are attached and detached. It may be configured with a connecting portion that is freely connected.

The mounting portion includes a flange projecting from the end of the gas pipe via a short pipe, a mounting pipe mounted on the flange and capable of sealing the end after inserting the wire of the cleaning tool, and the mounting pipe. It may be configured to include at least one valve provided in the above and through which a wire can be inserted, and an inert gas injection pipe connected between the respective valves or between one valve and the flange.

According to the present embodiment, since the cleaning mechanism is attached to the gas pipe, the cleaning efficiency is improved, and the cleaning can be performed while injecting the inert gas even during the operation, so that the operation efficiency is improved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, the waste a is indirectly heated by heated air to thermally decompose the waste a to generate a dry distillation gas G1 and a thermal decomposition residue b, and burn the thermal decomposition residue b. Waste pyrolysis drum 6 that separates and discharges the organic component d and the non-combustible component, and also leads the dry distillation gas G1 to the burner 11 of the melting furnace 9 via the gas pipe L3.
In addition, the gas pipe L3 is provided with a cleaning mechanism 60 including a cleaning tool 40 for cleaning deposits such as carbon or tar on the inner surface so that the gas pipe L3 can be freely inserted, and a mounting portion 50 of the cleaning tool 40.

As shown in FIGS. 4 and 5, the cleaning tool 40 has a wire 42 having a predetermined length and a tip formed in contact with the inner surface of the gas pipe L3, and the wire 42 in the longitudinal direction. Drive unit 43 that moves or rotates freely, and connection unit 44 that detachably connects the drive unit 43 and the wire 42
The mounting portion 50 has a flange 52 projecting from the end portion of the gas pipe L3 via the short pipe 51, and the wire 42 of the cleaning tool 40 attached to the flange 52 and then the end portion. A sealable mounting tube 53 and at least one valve 5 provided on the mounting tube 53 and through which the wire 42 can be inserted.
4, 55, and an inert gas injection pipe 56 connected between the respective valves 54, 55 or between one valve 54 and the flange 52.

As shown in the figure, the tip of the wire 42 has a branching shape or another shape suitable for cleaning the inner surface, and is connected to the drive section 43 through a connecting section 44 to move back and forth in the longitudinal direction. It is possible to advance and rotate. Therefore, the wire 42 on the tip side of the connection portion 44 is always connected to the gas pipe L
It is possible to insert it in the inside of the valve 3, and in that case, the valve 54
In addition, a ball valve or the like having a through hole for the wire 42 bored in the valve body is used, and a seal structure 57 is provided at the end of the mounting pipe 53. The internal pressure of the waste pyrolysis drum is about −10 mmAq, and
Air must be prevented from leaking into the gas pipe L3. The drive unit 43 is, for example, of an electric type or a manual type, includes a winding unit for the wire 42, and automatically drives the wire 42 by a signal using the electric type, and the valve 57.
Can be opened and inert gas can be injected.

When cleaning the inside of the gas pipe L3 during operation,
The drive unit 43 is connected through the connection unit 44 and the wire 42, and an inert gas such as nitrogen gas is supplied through the valve 57 of the inert gas injection pipe 56 to prevent air from leaking from the seal structure 58. While cleaning. The removed deposits are carried by the dry distillation gas G1 and burned in the burner 11 of the melting furnace 9 together with the dry distillation gas G1.

Further, as shown in FIG. 5, valves 54 and 55 are provided, and an inert gas injection pipe 56 is connected between the valves 54 and 55, whereby air leakage is further suppressed. After further injecting an inert gas and opening the valve 54, the valve 55
It is also possible to open the valve and attach the cleaning tool 40 to the attachment pipe 53 to clean the inside of the gas pipe L3 during operation as described above. The cleaning work is automated by forming each valve with a control valve.

When the cleaning mechanism 60 is attached while the operation is stopped and the inside of the gas pipe L3 is regularly cleaned, it is not necessary to perforate the through hole of the wire 42 in the valve body of the valve 54. Fully open this sluice valve using
The cleaning tool 40 may be attached to and cleaned. Injecting an inert gas is also unnecessary.

According to this embodiment, since the cleaning mechanism cleans the deposits in the gas pipe even during operation, it is not necessary to stop the operation periodically, and the operation efficiency is improved.

Details of the waste thermal decomposition drum 6 will be supplementarily described with reference to FIG. Hollow cylinder drum body (rotary drum) 7
Is a plurality of rollers 3 rotated by a drive source (not shown).
1 is rotated at about 2 rpm, and one end surface of the screw feeder 32 is slidably connected to a heated air outlet header 33 having a screw feeder 32 inserted in an inner tube 33b. The input port 4 for the waste a can be connected to. A heated air inlet header 34 is slidably connected to the other end surface of the drum body 7 through a seal, and the tube plate 33a of the heated air outlet side header 33 and the heated air inlet side header 34 are provided inside the drum body 7.
A plurality of heat transfer tubes 8 whose both ends are fixed to the tube sheet 34 a of the drum body 7 are arranged on the inner circumference of the drum body 7. The heat transfer tube 8 is formed of a heat-resistant or corrosion-resistant material such as austenitic stainless steel (SUS316, SUS310SS, SUS321 or SUS347), 50Cr-50Ni, Incoloy or Inconel. The other end of the heated air inlet side header 34 is directly connected to the heated air inlet channel 35 and the discharge device 10.
1 and an outlet 10b for the combustible component d and the non-combustible components e1 and e2 from which the thermal decomposition residue b is separated in the lower part.
Are provided. And the heated air inlet side header 34
Through the discharge hole 34b formed in the tube plate 34a of the discharge pipe 3a.
6 is inserted through the heated air inlet channel 35 and the discharge device 1
The thermal decomposition residue b and the like in the drum body 7 is discharged to the discharge device 10 through the discharge pipe 36.

Here, the waste treatment apparatus shown in FIG. 1 will be described in detail. Waste a such as municipal waste is supplied to a crusher 1 of, for example, a twin-screw shear type disposed in a receiving yard A by a first conveyor 2, where it is crushed to, for example, 150 mm or less. This crushed waste a is transferred to the second conveyor 3
Thus, the heat is supplied from the charging port 4 to the heat exchange section 6a through the screw feeder 5. The heat exchanging portion 6a is formed by arranging a plurality of heat transfer tubes 8 along the inner peripheral wall of the rotating drum body 7, and the inside pressure thereof is maintained at an atmospheric pressure of about -10 mmAq or less by an unillustrated sealing mechanism. To be done. High-temperature air heater 40 built in the downstream side of melting furnace 9
The heating air heated by the heat transfer pipe 8
The waste a is heated to 300 ℃ by this heated air.
It is indirectly heated to about 600 ° C., usually about 450 ° C.
Therefore, the waste a supplied into the heat exchange section 6a is thermally decomposed, and the carbonization gas G1 and mainly the non-volatile pyrolysis residue b are generated.

Dry distillation gas G1 generated in the heat exchange section 6a
The pyrolysis residue b is separated by the discharge device 10, the dry distillation gas G1 is supplied to the burner 11 of the melting furnace 9 through the line (gas pipe) L3, while the pyrolysis residue b is cooled by the cooling device 1.
It is cooled to about 80 ° C. in order to prevent ignition in 2 and then supplied to a known separation device 13 such as a sieve, a magnetic separation type, an eddy current type, a centrifugal type or a wind type selection type, in which fine ash content is contained. The combustible component d is separated into a metal component e1 and a non-metal component e2 which are non-combustible components.

The combustible component d is finely pulverized by the pulverizer 14 to, for example, 1 mm or less, supplied to the burner 11 of the melting furnace 9 through the line L4, and the dry distillation gas G1 supplied from the line L3 and the line by the blower 15. The combustion air F supplied from L5 is combusted in a high temperature region of about 1300 ° C., and the combustion ash generated at this time becomes molten slag that adheres to the inner wall of the melting furnace 9 and flows down, and from the discharge port 16 to the water tank 17
It flows down and cools and solidifies. The solidified slag is used as a building material such as a pavement material.

The high-temperature exhaust gas G2 generated in the melting furnace 9 is recovered by the waste heat boiler 21 from the line L7 through the high-temperature air heater 30, and dust is removed by the dust collectors 22a and 22b to become a low-temperature clean exhaust gas G3 and a chimney. 23 is released to the atmosphere. Part of the clean exhaust gas G3 is supplied to the cooling device 12 via the line L8. The steam generated in the waste heat boiler 21 rotates a steam turbine 24 connected to a generator.

When the waste is supplied to the heat exchange section, the waste is indirectly heated by heated air in a low oxygen atmosphere and thermally decomposed to produce a pyrolysis residue consisting of dry distillation gas and mainly non-volatile components. In this thermal decomposition process, the waste is 3
The temperature is indirectly increased by heating with heated air to 00 ° C to 600 ° C, usually about 450 ° C.

Then, the dry distillation gas produced in the pyrolysis reactor and the pyrolysis residue are separated by an exhaust device, and the dry distillation gas is supplied to a melting furnace which is a combustor, while the pyrolysis residue is cooled. And separated by a separator into combustible components and fine-grained ash, and coarse-grained non-combustible components made of metal such as iron or aluminum, and the combustible components and fine-grained ash contained therein are supplied to the melting furnace. And burned. In this case, since the inside of the melting furnace is maintained at a high temperature of about 1300 ° C., the combustion ash generated from the fine ash is melted to form a molten slag and adheres down to the inner wall of the melting furnace. The non-combustible components are separated into metal components such as iron and non-metal components such as pottery, the metal components are reused, and the non-metal components are mixed in landfill or, if necessary, mixed with molten slag and paved. Reused as materials.

[0024]

According to the present invention, since the gas pipe for dry distillation gas is equipped with the cleaning mechanism, it is possible to clean the deposits in the gas pipe even during operation, which reduces the cleaning man-hours and improves the operation rate. is there.

[Brief description of drawings]

FIG. 1 is a system diagram showing a waste treatment apparatus provided with a waste pyrolysis drum according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing the waste pyrolysis drum of FIG. 1;

3 is a configuration diagram showing a gas pipe of FIG. 1. FIG.

FIG. 4 is an enlarged sectional view of a part of FIG. 3;

FIG. 5 is a diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1 Crusher 2 1st conveyor 3 2nd conveyor 4 Input port 5 Screw feeder 6 Waste pyrolysis drum 6a Heat exchange part 7 Drum body 8 Heat transfer tube 9 Melting furnace 10 Exhaust device 11 Burner 12 Cooling device 13 Separation device 14 Crusher 15 Blower 16 Discharge port 17 Water tank 18 Container 19 Crusher 21 Waste heat boiler 22a, 22b Dust collector 23 Chimney 24 Generator 40 Cleaning tool 42 Wire 43 Drive part 44 Connection part 50 Mounting part 51 Short pipe 53 Mounting pipe 54, 55 Valve 56 Inert gas injection pipe

Claims (3)

[Claims] 1. A waste product is indirectly heated by heated air to thermally decompose the waste product to produce a dry distillation gas and a pyrolysis residue, and the pyrolysis residue is separated into combustible components and non-combustible components. In a waste pyrolysis drum that separates and discharges the dry distillation gas into a burner of a melting furnace through a gas pipe, a cleaning tool that cleans the gas pipe so that deposits on the inner surface can be inserted. A waste pyrolysis drum comprising a cleaning mechanism including an attachment portion of the cleaning tool. 2. The cleaning tool has a wire having a predetermined length and a tip formed so as to be in contact with the inner surface of the gas pipe, a drive section for moving the wire in the length direction, the drive section and the drive section. The waste pyrolysis drum according to claim 1, further comprising a connecting portion for detachably connecting the wire. 3. The mounting part comprises a flange projecting from the end of the gas pipe via a short pipe, and a mounting pipe mounted on the flange and capable of sealing the end after inserting the wire of the cleaning tool. It is characterized in that it comprises at least one valve provided in the attachment pipe through which the wire can be inserted, and an inert gas injection pipe connected between the respective valves or between one valve and the flange. The waste pyrolysis drum according to claim 1 or 2.