JP2002061828A - Waste disposal plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste disposal plant capable of being reduced in installation space as well as in manufacturing cost. SOLUTION: The plant comprises a pyrolysis drum for pyrolyzing waste into a pyrolysis gas and a pyrolysis residue, a pyrolysis gas channel 8 for guiding the pyrolysis gas from the pyrolysis drum to an incineration melting furnace 13 therethrough, and a deposit scraping mechanism 30 for scraping off a deposit on the inner surface of the pyrolysis gas channel 8. The deposit scraping mechanism 30 is composed of a revolving shaft 31 arranged in the pyrolysis gas channel 8 along the axial direction thereof and a scraper 32 arranged on the revolving shaft 31 for scraping off the deposit with the revolution thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a pyrolysis drum which pyrolyzes waste into a pyrolysis gas and a pyrolysis residue, and burns and melts the pyrolysis gas from the pyrolysis drum through a pyrolysis gas pipe. The present invention relates to a waste treatment plant which is configured to be guided in a furnace and provided with a deposit scraping mechanism for scraping and removing deposits attached to the inner surface of the pyrolysis gas pipeline.

[0002]

2. Description of the Related Art In a waste treatment plant of this type, if tar or dust adheres or accumulates on the inner surface of a pyrolysis gas pipeline, the pipeline is blocked.
As disclosed in Japanese Unexamined Patent Publication (Kokai) No. H11-264, there has been proposed a technology provided with a heating device for heating a pyrolysis gas pipeline.

However, according to this technique, the effect of preventing adhesion is not so high because the pyrolysis gas pipeline is simply heated, and therefore, the plant is frequently stopped and the pyrolysis gas pipeline is disconnected. The kimono had to be removed manually.

Therefore, as described at the beginning, a technique has been developed in which an adhering substance scraping mechanism for scraping off and removing adhering substances adhering to the inner surface of the pyrolysis gas pipe has been developed.

Conventionally, the adhering matter scraping mechanism is disclosed in
As disclosed in Japanese Unexamined Patent Publication (Kokai) No. 196333, a wire branched in a twig shape so that the tip can contact the inner surface of the pyrolysis gas pipeline is inserted into the pyrolysis gas pipeline, and a wire portion other than the proximal end side is connected. It is configured to be switchable while rotating the wire between a pushed-in state inserted into the pyrolysis gas pipeline and a drawn-out state in which a wire portion other than the tip side is drawn out of the pyrolysis gas pipeline, and heat is generated at the tip portion. The deposit was scraped from the cracked gas line.

[0006]

According to the above-mentioned conventional structure, the deposit can be removed from the pyrolysis gas pipeline, but the wire inserted into the pyrolysis gas pipeline is pushed and pulled. For this reason, a space corresponding to the stroke of the wire must be provided outside the pyrolysis gas pipeline, and a large installation space is required.

Further, since the tar adhering to the wire in the pyrolysis gas pipe goes out of the pyrolysis gas pipe when the wire is drawn out and is smoldered, it is possible to prevent tar from adhering to the wire and to prevent the tar from being attached to the wire. Therefore, there is a problem in that a device other than the attached matter scraping mechanism (such as a ventilator) is costly.

The present invention has been made in view of the above circumstances, and has as its object to reduce the installation space and to reduce the manufacturing cost. .

[0009]

The constitution, operation and effect of the invention according to claim 1 are as follows.

[0010] [Structure] In the waste treatment plant described at the beginning, the adhering matter scraping mechanism includes a rotating shaft that extends in the pyrolysis gas pipeline in a pipe axis direction and rotates with the rotation of the rotating shaft. And a scraping body for scraping the attached matter.

[Operation] A rotary shaft is rotated in the pyrolysis gas pipeline along the axis of the pipeline, and a scraping member provided on the rotary shaft is rotated to attach tar and dust from the pyrolysis gas pipeline. Scrape the kimono.

For example, in the technique of scraping off the deposits in the pyrolysis gas pipeline at the tip of the push-pull wire, a space for accommodating the drawn wire must be provided, and tar of the wire must be removed. Although there is a problem that it is necessary to provide an anti-adhesion measure and a ventilation device around the drawn wire (since tar adhering to the wire will smolder),
According to the configuration of the first aspect, since the attached matter is scraped as described above, it is not necessary to provide the accommodation space and the ventilation device.

[Effect] Therefore, the installation space can be reduced, and the manufacturing cost can be reduced.

The configuration, operation and effect of the invention according to claim 2 are as follows.

[Configuration] In the configuration according to the first aspect of the present invention, a plurality of fluid injection ports are formed in the pyrolysis gas pipeline at predetermined intervals in the axial direction of the pipeline. Fluid blowing means is provided for blowing fluid from the fluid blowing port into the pyrolysis gas pipe so that soot and ash are discharged.

[Function] In addition to providing the same function as the function of the first aspect, a fluid can be blown into the pyrolysis gas pipe from the plurality of fluid inlets to form a pyrolysis gas pipe. The soot and ash in the passage can be discharged to the outside of the pipe, and the tar and dust in the pyrolysis gas are discharged to the outside of the pyrolysis gas pipe by the fluid, so that the tar and dust are removed from the rotary shaft. In addition, it can be prevented from adhering to the scraping body.

Since the plurality of fluid injection ports are formed in the pyrolysis gas pipe at predetermined intervals in the axial direction of the pipe, for example, the fluid injection ports from the fluid injection port on the upstream side in the flow direction of the pyrolysis gas are used. By controlling the fluid to be opened in order and to supply the fluid, it is possible to prevent a rapid pressure fluctuation in the pyrolysis gas pipeline and the molten combustion furnace as when all the fluid injection ports are simultaneously opened. be able to.

For example, the rotary shaft is formed hollow, and a plurality of fluid inlets are formed at predetermined intervals in the longitudinal direction of the rotary shaft so that the fluid passing through the rotary shaft is heated by the fluid inlet through the fluid inlet. In the technique of supplying the gas into the cracked gas pipe, the problem that the pressure in the pyrolyzed gas pipe and the inside of the melting combustion furnace fluctuates rapidly as described above, However, according to the configuration of claim 1, since the plurality of fluid injection ports are formed in the pyrolysis gas pipeline, the above problem is solved. be able to.

[Effect] Therefore, in addition to the same effect as the effect of the first aspect, it is possible to more reliably discharge the deposits to the outside of the pyrolysis gas pipe, thereby achieving higher cleaning. The effect can be obtained, and furthermore, it is possible to stably burn in the combustion melting furnace.

The construction, operation and effect of the invention according to claim 3 are as follows.

[Structure] In the structure of the invention according to claim 1 or 2, the scraping body is formed by a screw blade.

[Operation] In addition to providing the same operation as the operation according to the configuration of claim 1 or 2, the structure of the scraping body can be simplified since the scraping body is formed by the screw blades. The scraped deposits can be conveyed to the combustion melting furnace side by the screw blade.

[Effect] Therefore, the same effect as the effect of the first or second aspect can be more easily obtained.

The structure, operation and effect of the invention according to claim 4 are as follows.

[Configuration] In the configuration of the invention according to any one of claims 1, 2 and 3, of the two ends of the rotary shaft, the end opposite to the rotary drive unit is connected to the pyrolysis gas pipeline. Is rotatably supported.

[Operation] In addition to the same operation as the operation according to any one of the first, second, and third aspects, the other end of the rotating shaft on the opposite side to the rotation drive unit can be obtained. The part is rotatably supported by the pyrolysis gas pipeline, so that the bending of the rotating shaft can be suppressed, and the scraping member caused by the bending of the rotating shaft and the inner surface of the pyrolysis gas pipeline slide. Wear of both can be suppressed.

[Effect] Therefore, in addition to the same effects as the effects of any one of the first, second, and third aspects, the durability of the scraping body and the pyrolysis gas pipe can be improved. I was able to.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a pyrolysis gasification and melting plant as a waste treatment plant. This pyrolysis gasification and melting plant is composed of a receiving and supplying facility 1, a pyrolysis reaction facility 2, a pyrolysis residue sorting facility 3, a high-temperature combustion and melting facility 4, a boiler power generation facility 5, and an exhaust gas treatment facility 6. Next, each facility will be described.

[Receiving and Supplying Equipment 1] The waste stored in the waste pit 7 is crushed by a crusher (not shown) to 150 mm square or less, and the crushed waste is sent to the pyrolysis drum equipment 2 by the transfer device 9. .

[Thermal Decomposition Reaction Facility 2] The screw conveyer 10 removes the waste from the waste pit 7 by the pyrolysis drum 12
The waste is thermally decomposed by the pyrolysis drum 12 into a pyrolysis gas at about 450 ° C. and a pyrolysis residue in an oxygen-free or low-oxygen atmosphere.

The pyrolysis gas is sent to a high temperature combustion melting furnace 13 through a pyrolysis gas duct 8 (corresponding to a pyrolysis gas pipeline).
The pyrolysis residue is sent to the pyrolysis residue sorting equipment 3. The pyrolysis gas duct 8 and the detailed structure around the pyrolysis gas duct 8 will be described later.

[Pyrolysis Residue Separation Equipment 3] The pyrolysis residue from the pyrolysis reaction equipment 2 is conveyed while being cooled by a cooling conveyor 14, and is subjected to iron / iron separation by a screen 15 and a sorter 16 (a magnetic sorter or an aluminum sorter). Sorting and collecting valuables such as aluminum,
The carbon residue other than valuables is sent to the high temperature combustion melting furnace 13.

[High-Temperature Combustion Melting Facility 4] Pyrolysis gas, carbon residue, and dust (dust from the boiler and dust collector 22) are blown into the high-temperature combustion and melting furnace 13 from the furnace top side, and they are swirled and burned. The ash melts and is continuously discharged from the furnace bottom.

[Boiler power generation equipment 5] Exhaust gas is cooled in a boiler radiation zone and brought to a uniform temperature in an evaporating tube group.
Send to superheated steam tube group at 00 ° C. 41 at boiler 18
a. Steam at 400 ° C. is recovered by heat and is recovered as electricity by the turbine 19 and the generator 20.

[Exhaust gas treatment equipment 6] The exhaust gas is treated in the cooling tower 21, the dust collector 22, and the like, and exhausted from the chimney 25.

Next, the pyrolysis gas duct 8 of the pyrolysis reaction facility 2 and the structure around the pyrolysis gas duct 8 will be described.

As shown in FIGS. 1 and 2, the pyrolysis gas duct 8 includes a chimney type duct 26 connected to a pyrolysis gas / pyrolysis residue discharge case 45 on the pyrolysis drum 12 side,
Horizontal duct 27 connected to this chimney type duct 26
And a vertical duct 29 having one end connected to the horizontal duct 27 and the other end connected to the furnace top side of the high-temperature combustion melting furnace 13, and each duct is connected by an electric heater or the like (not shown).
The temperature is raised to 480 ° C to prevent tar and the like from adhering to the inner surface of the duct.

The horizontal duct 27 is provided with a deposit scraping mechanism 30 for scraping and removing deposits such as tar and dust attached to the inner surface thereof.

This adhering matter scraping mechanism 30 is shown in FIG.
As shown in FIGS. 3 (a) and 3 (b), a rotating body formed by supporting a screw blade 32 (corresponding to a scraping body) for scraping off attached matter on a rotating shaft 31 via a plurality of supporting members 40. Is inserted into the horizontal duct 27 from one end thereof, and an electric motor M as a rotation drive unit is interlockedly connected to the other end of the rotating shaft projecting from the horizontal duct 27 on the chimney type duct 26 side. I have. That is, the adhering matter scraping mechanism 30 applies the adhering matter to the rotating shaft 31 in the horizontal duct 27 along the axis of the horizontal duct 27 (corresponding to the direction of the pipe axis) with the rotation of the rotating shaft 31. The structure is provided with a screw blade 32 for scraping.

The screw blade 32 is made of a ribbon-shaped metal material having excellent abrasion resistance (may be formed of a ceramic material). A gas circulation space S is formed.

One end of the rotating shaft 31 (the electric motor M
The other end of the horizontal duct 27 is rotatably supported at the end of the horizontal duct 27 via a cross-shaped support member 33.
Thereby, the bending of the rotating shaft 31 can be suppressed.
Further, since the rotating shaft 31 and the screw blade 32 do not interfere with the vertical duct 29, the burner of the combustion melting furnace 13 is disposed above and below the vertical duct 29 so as to be movable up and down.

With the above structure, the rotating shaft 31 is rotated in the horizontal duct 27 and the screw blades 32 are rotated to scrape off the deposits from the horizontal duct 27. Then, the scraped deposit is conveyed to the vertical duct 29 side by the screw blade 32 and supplied to the combustion melting furnace 13 for combustion. Rotating shaft 31
Is continuously rotated when the plant is operating.

As shown in FIG. 2, a plurality of steam inlets 34 (corresponding to fluid inlets) are formed in the horizontal duct 27 at predetermined intervals in the axial direction of the horizontal duct 27. Steam is injected from the steam inlet 34 into the horizontal duct 27 so that soot and ash are discharged from the inside.
A steam blowing means 35 (corresponding to a fluid blowing means) for periodically blowing into the inside is provided.

The steam blowing means 35 is connected to the boiler 18
The branch steam pipe 36 branched from the main steam pipe is connected to each steam blow-in port 34 through a plurality of solenoid valves V, and a control device 37 for controlling the opening and closing of the solenoid valve V is provided. .

The control device 37 controls each of the solenoid valves V so as to sequentially open and supply steam from the steam blowing port 34 on the upper side in the flow direction of the pyrolysis gas. Thereby, for example, it is possible to prevent a sudden change in pressure in the horizontal duct 27 and the high-temperature melting and burning furnace 13 such as when all the solenoid valves V are simultaneously opened.

With the above structure, soot and ash in the horizontal duct 27 can be blown off by blowing steam into the horizontal duct 27 from the plurality of steam blowing ports 34, and furthermore, tar dust in the pyrolysis gas is removed. The steam is discharged to the outside of the horizontal duct 27 to prevent tar and dust from adhering to the rotating shaft 31 and the screw blade 32.

[Alternative Embodiment] In the above embodiment, the rotary shaft 31 is continuously rotated when the present plant is operating, but may be periodically driven and rotated.

Instead of the screw blade 32, a scraping body having another structure may be provided on the rotating shaft 31.

The pyrolysis gas duct 8 is not limited to the above structure. For example, instead of the horizontal duct 27,
An inclined duct that becomes lower toward the high-temperature combustion melting furnace 13 may be provided.

In place of the steam, an inert gas may be supplied to the pyrolysis gas duct 8.

The rotary drive of the rotary shaft 31 may be constituted by a hydraulic or pneumatic drive.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a pyrolysis gasification and melting plant.

FIG. 2 is a longitudinal sectional front view showing an attached matter scraping mechanism.

FIG. 3 is a view showing a support structure of a rotating shaft.

[Explanation of symbols]

 Reference Signs List 8 pyrolysis gas pipeline 12 pyrolysis drum 30 adhering matter scraping mechanism 31 rotating shaft 32 scraping body 34 fluid blowing port 35 fluid blowing means M rotation drive unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F23G 5/14 ZAB F23G 5/14 ZABF F-term (Reference) 3K061 AA07 AA23 AB02 AB03 AC01 DA01 DA13 DA18 DA19 FA10 FA21 QC06 QC38 RA04 3K078 BA03 BA22 CA02 CA21 CA24 4D004 AA46 CA27 CA29 CB41 CB50

Claims (4)

[Claims] A pyrolysis drum for pyrolyzing waste into a pyrolysis gas and a pyrolysis residue is provided, and the pyrolysis gas from the pyrolysis drum is guided through a pyrolysis gas line to a combustion melting furnace. A waste treatment plant, comprising: an adhering substance scraping mechanism that scrapes and removes adhering substances adhering to an inner surface of the pyrolysis gas pipeline, wherein the adhering substance scraping mechanism includes the pyrolysis gas. A waste treatment plant comprising a rotary shaft extending in a pipe axis direction in a pipe, and a scraper for scraping off the adhering matter with the rotation of the rotary shaft. 2. A plurality of fluid injection ports are formed in the pyrolysis gas pipeline at predetermined intervals in the axial direction of the pipeline so that soot and ash are discharged from the pyrolysis gas pipeline. The waste treatment plant according to claim 1, further comprising a fluid blowing unit configured to blow fluid from the fluid blowing port into the pyrolysis gas pipeline. 3. The waste treatment plant according to claim 1, wherein the scraping body is formed by a screw blade. 4. The pyrolysis gas pipe according to claim 1, wherein an end of the rotating shaft opposite to the rotation driving section is rotatably supported by the pyrolysis gas pipeline. Waste treatment plant according to one of the above.