JPH11226542A - Waste treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To respond to the variation of a treatment quantity and the variation of pyrolysis energy varying by the change of a treatment material in a short time by improving the heat response of a rotary kiln apparatus and to improve heat efficiency by downscalling a heating zone. SOLUTION: A waste treatment apparatus is constituted from a kiln main body 1 which is constituted from a hollow cylindrical body which supports the lower part of a tire 1a rotatably by a roller and closed by apparatuses arranged in the front and rear stages, transports waste raw materials including chlorine compounds carried from the front stage while heating them at a prescribed temperature in the inside, and produces pyrolysis gas and a non-volatile residue, a waste raw material charging device 9 having a screw feeder 6 for transporting the waste to the kiln main body 1, induction heating coils 4a, 4b, 4c for induction-heating the kiln main body 1 from the outside, and a residue recovery chamber 13 which is arranged in the rear stage of the kiln main body 1, recovers the non-volatile residue, collects pyrolysis gas, and discharges the gas to a gas treatment apparatus in the rear stage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to vinyl chloride,
The present invention relates to a waste treatment apparatus for treating waste containing a chlorine compound such as polyethylene so as not to generate dioxin.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 9-217910 discloses a waste disposal apparatus of this type for producing waste by heating a waste containing a chlorine compound such as vinyl chloride and polyethylene to generate a pyrolysis gas and a non-volatile residue. Are known. According to this publication, waste is carried into a hollow cylindrical rotating body by a screw feeder, and a plurality of heating tubes are inserted into the cylindrical body from a heated air chamber provided before and after the cylindrical body, for example, the cylindrical body. At approximately the center in the longitudinal direction, on the outer peripheral side of the cylindrical body, the heating pipe is piped such that the heating air from the heating air chamber is discharged, and heating air is supplied from the heating air chamber to the heating pipe. Further, the waste supplied into the cylindrical body is heated to generate a pyrolysis gas and a non-volatile residue. At that time, the inflow direction of the heated air flows from the upstream side to the center of the cylindrical body, and from the downstream end to the center,
The temperature of the heating pipe in the upstream part is excessively cooled by the input waste, and the temperature in the waste is relatively low (100 ° C. or less)
It is devised so as to prevent polyethylene, polypropylene, etc., which melts in the above, from melting and adhering to the heating tube and hindering the heating of the waste to be charged thereafter. Further, a heating air chamber is provided downstream of the cylindrical body, and further downstream there is provided a discharge device for separating heated waste into a pyrolysis gas and a non-volatile residue and discharging the same.

[0003]

By the way, in the conventional structure, the heating pipe for heating the waste is heated by the heated air, and the heat transfer between the heated air and the heating pipe is relatively small. If the amount of waste that comes into contact with the heating tube fluctuates greatly, it takes time to compensate for the temperature change of the heating tube due to the amount of heat taken by the waste, and when the temperature of the heating tube is below a predetermined value, There is a problem that the heating of newly input waste is delayed, and the heating zone needs to be lengthened accordingly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. An object of the present invention is to improve the heat response and to improve the thermal decomposition energy of the thermal decomposition energy which fluctuates due to the variation of the throughput and the variation of the workpiece. An object of the present invention is to provide a waste treatment apparatus in which a heating zone is reduced in size in response to fluctuations in a short time and thermal efficiency is improved.

[0005]

According to a first aspect of the present invention, there is provided a cylindrical tire provided at both ends in a longitudinal direction, the lower part of which is rotatably supported by rollers of a driving device. It is composed of a hollow cylindrical body whose interior is sealed by equipment installed in the front and rear stages, and transports waste materials containing chlorine compounds brought in from the front stage while heating and holding them at a predetermined temperature inside and thermally decomposes A kiln body that produces gas and non-volatile residue, a waste material input device having a screw feeder disposed in front of the kiln body and transporting the waste to the kiln body, and the kiln body from the outer peripheral side An induction heating coil for induction heating, and a residue recovery chamber disposed at a subsequent stage of the kiln body to collect non-volatile residues and collect a pyrolysis gas and discharge the gas to a gas treatment device at a subsequent stage. And it said that there were pictures.

According to a second aspect of the present invention, in the waste treatment apparatus according to the first aspect, the induction heating coil for induction heating the kiln body is divided into a plurality of pieces in the axial direction of the kiln and each of the induction heating coils is divided into a plurality. The output of the coils can be individually controlled. Further, as in the invention according to claim 3, in the waste treatment apparatus according to claim 1 or 2, the induction heating coil divided into a plurality has a kiln entrance side with a higher output than the output of the subsequent stage. can do.

According to the first to third aspects of the present invention, the cylindrical body for heating the waste can directly improve the heat response due to the direct heating of the cylindrical body by the induction heating, and is optimal for the heating of the waste. It becomes possible to select a heating pattern, and it is possible to reduce the size as a whole and to improve the thermal efficiency. According to a fourth aspect of the present invention, in the waste treatment apparatus according to any one of the first to third aspects, the screw feeder of the waste material input device includes a cylindrical portion and a conical portion, A screw blade is protruded continuously from both parts, the cylindrical part is disposed at the lower part in the hopper that temporarily holds the waste material, the tip of the conical part is directed toward the kiln body side, and the tip of the conical part from the hopper The outer diameter side of the screw blade is covered with a metal pipe having an inner diameter slightly larger than the outer diameter, and a straight pipe heading toward the kiln body side is connected to the tip of the metal pipe, and A cooler for cooling the straight pipe from outside is provided.

[0008] With the above configuration, the portion equipped with the cooler is filled with the waste material pushed from the screw feeder, so that it can function as a check valve for preventing the backflow of the pyrolysis gas from the kiln body. become. According to a fifth aspect of the present invention, in the waste disposal apparatus according to any one of the first to fourth aspects, a heat insulating material is provided downstream of a straight pipe having a cooler connected to a tip of the screw feeder. A straight pipe is connected to the kiln body via the main pipe, and an induction heating coil is provided for inductively heating the straight pipe from the outside and heating and reducing the volume of the waste material pushed in from the screw feeder.

According to a sixth aspect of the present invention, in the waste disposal apparatus according to any one of the first to fifth aspects, the temperature of the heated zone immediately below each induction heating coil is detected. A sensor is provided to control the temperature of each zone, and to control not to exceed a predetermined temperature in each zone. According to the above configuration, the waste is heated inside the straight pipe in a state close to the straight pipe, so that the heat transfer to the waste is good, and the volume is reduced at that portion, and the subsequent reduced waste is discharged. When it is extruded into a cylindrical body, it is a carbide whose volume is reduced to 1/10 to 1/20. For this reason, the subsequent rotating cylinder only needs to maintain a certain amount of heating and the temperature of the waste reduced in volume due to the generation of cracked gas, and the length and volume of the cylinder can be reduced without preheating the waste. Compared to the case of carrying into the body, it can be downsized and the heat loss due to the reduction of the outer surface area due to the reduction of the outer surface area reduces the total amount of heat per unit processing amount, making it possible to improve the thermal efficiency Become.

[0010] Further, the waste heated without the straight pipe is pushed by the subsequent waste and carried into the kiln main body. At the time when the waste is carried into the kiln main body, the waste is carbonized. It does not adhere to the wall surface of the main body.
In addition, by detecting the temperature of each zone and controlling it to a predetermined temperature even for changes in waste treatment volume and quality, it is possible to respond relatively quickly in combination with the characteristics of induction heating Thus, it is possible to suppress generation of harmful gases such as dioxin due to overheating, and to suppress adhesion of waste to the inner wall of the cylinder due to insufficient heating.

According to a seventh aspect of the present invention, in the waste disposal apparatus according to any one of the first to sixth aspects, an inert gas introducing means for introducing an inert gas into the kiln body is provided. It is characterized by. With the above configuration, the oxygen concentration can be reduced in the zone where the waste is heated and kept warm, so that it is possible to prevent the generation of harmful gas from chlorine gas or the like contained in the pyrolysis gas beforehand. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a configuration diagram of a main part of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a tire provided with a large-diameter cylindrical tire 1a at each end, and at least two wheels 2a contacting each other at a contact point forming a triangle having the center of a circle of the tire 1a as an apex. A kiln body rotatably supported by a tire support device 2 rotatably receiving and supporting 1a, and a heat insulating material 3 for suppressing heat radiation from the kiln body 1 is provided on an outer periphery of the kiln body 1. . Further, on the outer peripheral side, induction heating coils 4a, 4b, 4c which are divided into three in the axial direction of a substantially concentric circle with the kiln body 1 are arranged with a space between the heat insulating material 3 and the heat insulating material 3. Further, upstream of the kiln body 1, a hopper 5 into which waste is charged, and a blade continuously projecting from a cylindrical portion attached to a lower portion of the hopper 5 and a cone fixed to the tip thereof are spirally provided. A screw feeder 6,
A waste material input device 9 having a straight pipe 7 extending from the screw feeder 6 toward the kiln body 1 and a cooler 8 for cooling the straight pipe 7 from the outside is attached to the distal end thereof through a heat insulating material 10. And a straight tube 11 connected to the kiln body 1 and an induction heating coil 12 provided on the outer periphery thereof for induction heating the straight tube 11. Downstream of the kiln body 1, the waste collects the non-volatile residue generated in the pyrolysis gas and the non-volatile residue in the kiln body 1, and discharges the pyrolysis gas to an exhaust gas treatment device in the next step. A non-volatile residue recovery chamber 13 is provided. The non-volatile residue collected in the non-volatile residue collection chamber 13 is forwarded by the discharge feeder 13a and is carried on the upper damper 13b at the lower end of the non-volatile residue collection chamber 13,
The damper 13b is opened to be fed onto the lower damper 13b, the upper damper 13b is closed, and then the lower damper 13b is opened to be discharged to the outside.

The induction coils 4a, 4b, 4 of the kiln body 1
The representative temperature at the location corresponding to c is the temperature sensor 14a, 14
b, 14c, the straight pipe 1 in front of the kiln body 1
The temperature 1 is detected by the temperature sensor 15 and controlled to each target temperature. In order to reduce the oxygen concentration in the kiln body 1, an inert gas is supplied to the inert gas introducing means 15.
Introduced from.

In the above construction, the waste containing a chlorine compound such as vinyl chloride or polypropylene, which has been introduced into the hopper 5 of the waste material introduction device 9, is cooled by a screw feeder 6 into a straight pipe provided with a cooler 8 on its outer periphery. It is pushed so that it may fill in 7. At this time, the waste heats up due to the internal frictional heat of the screw feeder 6, and the temperature rises. Here, the waste is cooled by the cooler 8 from the outside so as not to be heated until the volume is reduced, and the straight pipe 7 is filled. In this state, the waste is pushed forward by the following waste, so that the pyrolysis gas does not flow backward from this portion to the hopper 5 side. Then, it is further pushed by the following waste, and is led into a straight pipe 11 having an induction heating coil 12 which is connected forward through an insulating material 10 and inductively heats the outer periphery. The volume is reduced to 10 to 1/20 and partly becomes pyrolysis gas. The pyrolysis gas is pushed into the kiln body 1 by the gas pressure and subsequent waste. The kiln body 1
Is a tire 1a having a larger diameter than the kiln body 1 provided at both ends.
The tire 1a is rotatably supported by a tire support device 2 having wheels 2a rotatably supporting the tire 1a, and is rotationally driven by a drive device (not shown). The waste volume reduced by heating in the straight pipe 11 and carried into the kiln body 1 is given a rotational force in accordance with the rotation of the kiln body 1, and is provided with heat insulation attached to the outer periphery of the kiln body 1. Induction heating coil 4 arranged at a distance from material 3
a, 4b, and 4c, the temperature sensors 14a, 14b are set so that the temperature of the kiln body 1 becomes a target value at each location.
b, 14c and a control device (not shown), heated by the heat from the heated kiln main body 1 to generate a pyrolysis gas and a non-volatile residue, advance and advance to the non-volatile residue recovery chamber 13 Will be collected.

The non-volatile residue is discharged from the discharge feeder 1.
3a, the upper damper 13b is sent to the upper damper 13b, and the upper damper 13b is opened and sent to the lower damper 13b.
After the outside air is prevented from entering the inside and the gas is prevented from leaking from the kiln body 1, the lower damper 13b is opened and discharged to the outside.

The non-volatile residue recovery chamber 13 is provided with a pipe so as to collect the pyrolysis gas and discharge the pyrolysis gas to an exhaust gas treatment device in the next step. In addition, an inert gas is introduced into the kiln main body 1 from the inert gas introduction means 15 so that the oxygen concentration is reduced in the above process so that the pyrolysis gas does not become a harmful gas.

[0017]

According to the present invention, since the heating of the kiln body is controlled by the induction coil divided in the axial direction, the thermal response is good, and the temperature change of the kiln body wall surface due to the change in the amount and quality of waste. In response to the temperature change, the temperature change can be controlled to be small, so that the amount of waste, and the waste attached due to the extreme temperature drop of the kiln body wall due to the change in quality, the subsequent waste adhered. It is possible to prevent the following waste from being underheated due to insufficient heat transfer from the kiln body wall due to overlapping with the waste, and the kiln body can be downsized because there is no need to secure an extra heating area. it can.

Further, the size of the kiln body is further reduced by heating and reducing the volume of the waste material in a straight pipe provided between the kiln body and the waste material input device, and the surface area of the outer wall of the kiln body due to the miniaturization. As a result, the heat dissipation loss therefrom is reduced, the heat consumption per unit processing amount is reduced correspondingly, and the heat efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Kiln main body 1a Tire 2 Tire support device 2a Wheel 3 Heat insulating material 4a, 4b, 4c, 12 Induction heating coil 5 Hopper 6 Screw feeder 7, 11 Straight pipe 8 Cooler 9 Waste material input device 10 Heat insulating material 13 Non-volatile residue Collection chamber 14a, 14b, 14c Temperature sensor 15 Inert gas introduction means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F27B 7/32 B09B 3/00 ZAB

Claims (7)

[Claims] 1. A hollow cylindrical body in which a lower portion of a cylindrical tire provided at both ends in a longitudinal direction is rotatably supported by rollers of a driving device, and the inside thereof is hermetically sealed by devices provided at front and rear stages. A kiln body configured to transport a waste material containing a chlorine compound carried in from the preceding stage while heating and holding the waste material therein at a predetermined temperature to generate a pyrolysis gas and a non-volatile residue; and disposed at a preceding stage of the kiln body. A waste material input device having a screw feeder for transferring the waste to the kiln body, an induction heating coil for induction heating the kiln body from the outer peripheral side, and a non-volatile A waste treatment apparatus comprising: a residue collection chamber that collects the residue, collects the pyrolysis gas, and discharges the pyrolysis gas to a downstream gas treatment apparatus. 2. The waste disposal apparatus according to claim 1,
A waste treatment apparatus, wherein an induction heating coil for induction heating a kiln body is divided into a plurality of pieces in an axial direction of the kiln so that output of each induction heating coil can be individually controlled. 3. The waste treatment apparatus according to claim 1, wherein the induction heating coil divided into a plurality of units has a kiln entrance side with a higher output than a subsequent stage output. Object processing equipment. 4. The waste treatment apparatus according to claim 1, wherein the screw feeder of the waste material input device is composed of a cylindrical portion and a conical portion, and is continuous with both portions. The screw blade is protruded and the cylindrical part is disposed in the lower part of the hopper that temporarily holds the waste material.The tip of the conical part is directed toward the kiln body, and the screw blade from the hopper to the tip of the conical part is screwed. The outer diameter side is covered with a metal pipe having an inner diameter slightly larger than the outer diameter, and a straight pipe heading toward the kiln body side is connected to the tip of the metal pipe. A waste treatment device comprising a cooler for cooling. 5. A waste treatment apparatus according to claim 1, wherein the kiln body is connected to the tip of the screw feeder through a heat insulating material at a stage subsequent to a straight pipe having a cooler. A waste treatment apparatus comprising: an induction heating coil for connecting a straight pipe connecting the pipes, inductively heating the straight pipe from the outside, and heating and reducing the volume of the waste material pushed in from the screw feeder. 6. A waste treatment apparatus according to claim 1, wherein a sensor for detecting the temperature of the heated zone immediately below each induction heating coil is provided, and a sensor is provided for each zone. A waste treatment apparatus which performs temperature control and controls so that each zone does not exceed a predetermined temperature. 7. The waste treatment apparatus according to claim 1, further comprising an inert gas introduction means for introducing an inert gas into the kiln body. .