JP3872247B2 - Pyrolysis method of horizontal cylindrical rotary waste FRP - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to waste plastics having poor heat conductivity in recycling composite waste plastics (hereinafter abbreviated as waste plastics).Pyrolysis methodBelongs to.
  In particular, the present invention is required to recycle waste FRP that is currently a problem, and can be used in this field.
[0002]
[Prior art]
Conventionally, a rotary kiln furnace that thermally decomposes waste plastic is known, and the waste plastic is thermally decomposed using a rotary kiln furnace or the like.
[0003]
[Problems to be solved by the invention]
However, when pyrolyzing waste plastics in a rotary kiln furnace, etc., the remaining core material of non-decomposable components such as glass fibers that make up the waste plastic itself rotates, which expands into a cotton-like shape and closes the furnace. Had reduced its ability. In addition, since the remaining core material expands and is taken out in a cotton shape, it needs to be shaped when reused, which has been an obstacle to reuse. Furthermore, since the furnace temperature is not uniform, the strength of the remaining core material has been deteriorated due to the high temperature treatment, which has hindered reuse.
[0004]
  The present invention has been devised in view of the problems as described above, and has been devised in order to solve the problems. The object of the present invention is to substantially remove the non-decomposed component (residual core material) in the thermal decomposition of waste plastic. The waste plastics with poor heat conduction are pyrolyzed at a temperature close to the pyrolysis temperature as much as possible to prevent the residual core material from deteriorating and thermally decomposed. Horizontal cylindrical rotating waste plastic that stabilizes the properties of the product, cools and fractionates the gasification components of the pyrolysis products at their respective condensation temperatures, and recycles them together with the liquid components of the pyrolysis productsPyrolysis methodIs to provide.
[0009]
[Means for Solving the Problems]
  To achieve the above objectives,Claim1Horizontal cylinder rotating wasteFRPThe thermal decomposition method of this is discarded in a rotating container placed horizontally in the furnace.FRPA suitable amount is filled and heated gas is supplied while rotating around the horizontal axis. At the beginning of rotation, the rotating container is rotated at a low speed to dispose of the waste in the container.FRPLet the pieces fall freely and dispose of the heated gas in the same container.FRPInfiltrate evenly throughout the piece and abandon after reaching the pyrolysis temperatureFRPThe rotation of the rotating container is increased so that the piece does not fall freely and is discarded by its centrifugal force.FRPAffix the piece to the inner peripheral surface of the rotating containerFRPWaste that is stuck to the inner peripheral surface of the rotating container using centrifugal force and gravity fluctuations while preventing the piece from rotatingFRPIt consists of a means for thermally decomposing the piece by internal vibration to improve heat transfer with a heating medium such as a heated gas or a thermal decomposition product.
[0010]
  That is, the present invention includes a horizontally long hollow shaft having a hole in the outer periphery, a cylinder arranged coaxially, having a hole in the outer periphery, openable at one end and closed at the other end, and enclosing the cylinder and taking in and out the cylinder. A furnace having an opening / closing part for opening and partly provided with an opening for discharging heated gas and pyrolysis products, a heated gas supply source connected to the hollow shaft, and the hollow shaft and the cylinder are rotated. Horizontal cylindrical rotating waste plastic composed of a power sourcePyrolysis methodTherefore, it is suitable for recycling waste plastic, particularly waste FRP.
[0011]
  Configured like thisThermal decomposition methodThe cylinder openable side is opened and filled with waste plastic pieces and then closed, the furnace opening and closing part is sealed, the hollow shaft and the cylinder are rotated by a power source, and the change in centrifugal force and gravity is applied to the waste plastic pieces. While being supplied, the heated gas having reached the pyrolysis temperature is continuously supplied from the heated gas supply source to the hollow shaft. The heated gas creates a flow in the circumferential direction from the center of the cylinder through the hole of the hollow shaft, heats the waste plastic piece, pyrolyzes it, and discharges it from the opening of the furnace through the hole on the outer periphery of the cylinder. . In this manner, the waste plastic piece is separated into a non-decomposed component (residual core material) and a gasification component or a liquid component that is a thermal decomposition product.
[0012]
At the same time, by adjusting the rotational speed of the cylinder to cause the centrifugal force to act on the waste plastic piece more than gravity and to prevent dropping due to gravity, the remaining core material is separated in an almost intact shape. Also, by rotating the cylinder, the vibration of centrifugal force and gravity and the elasticity of the waste plastic piece are combined to vibrate, and the heated gas is uniformly permeated between the waste plastic pieces to improve the heat transfer, and the waste plastic pieces The thermal decomposition is efficiently carried out at as low a temperature as possible.
[0013]
The heated gas and the pyrolysis product are discharged into the furnace from the hole in the outer peripheral portion of the cylinder, and are discharged from a part of the opening of the furnace. A pipe is provided at the opening in a part of the furnace to separate the liquid component of the pyrolysis product, and the gasification component of the pyrolysis product and the heated gas are sent to the cooling device, and the gasification component is separated. The fraction is cooled and distilled at a condensation temperature of 2 to recycle. On the other hand, the non-decomposed component (residual core material) is opened and reused by opening the openable / closable part of the furnace, opening the openable / closable part of the cylinder, and out of the cylinder.
[0014]
In addition, by providing guide vanes on the outer periphery of the cylinder, the pyrolysis products discharged from the outer peripheral hole of the cylinder are forced to flow and rotate in the furnace, so heat exchange between the furnace and the cylinder can be performed, The temperature of the furnace and the cylinder is made uniform to efficiently recover the pyrolysis product.
Furthermore, by providing a plurality of partition plates radially in the cylinder at equal intervals, the cylinder can be reinforced and the cylinder can be uniformly filled with waste plastic pieces, and the bias at the start of rotation can be limited. As a result, the heated gas hitting the waste plastic piece becomes uniform, and the thermal decomposition of the waste plastic piece becomes more efficient.
[0015]
By irradiating the inside of the cylinder with electromagnetic waves of an appropriate frequency, the heated gas and the thermal decomposition product are vibrated to generate thermal energy, and the waste plastic piece can be heated and thermally decomposed.
[0016]
Further, by providing a spring having an appropriate elasticity at an appropriate position inside the cylinder, it is possible to force the vibration of the waste plastic piece, and to correct the nonuniformity of thermal decomposition due to the portion in the cylinder. Furthermore, the number of rotations per minute of the cylinder is increased to increase the number of internal vibrations per minute of the waste plastic piece, thereby making thermal decomposition more efficient.
[0017]
Further, the decomposition rate of the thermal decomposition can be adjusted by adjusting the temperature and flow rate of the heated gas to the amount of heat necessary for the thermal decomposition of the waste plastic piece.
[0018]
In addition, when there is a possibility that harmful substances may be generated in the pyrolysis products of waste plastic pieces, it is possible to adjust the properties of the pyrolysis products by supplying different types of heating gas and chemical properties. It becomes possible.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of Embodiment-1 of the present invention.
In FIG. 1, reference numeral 1 denotes a cylindrical hollow shaft having a plurality of holes 1 a on the outer periphery. A cylinder 2 as a rotating container having a plurality of holes 2 a on the outer periphery is attached to the outer periphery of the hollow shaft 1. ing. The cylinder 2 is arranged concentrically with the hollow shaft 1. The hollow shaft 1 and the cylinder 2 are attached so as to rotate around a horizontal axis. Further, the front plate 2b at one end of the cylinder 2 is removable. 2 c is a rear plate fixed to the other end of the cylinder 2. 3 is a furnace containing the cylinder 2, and 3a is a closed hatch mechanism on the front wall of the furnace 3, and slides in the direction of the arrow in the figure. Reference numeral 3b denotes a rear wall of the furnace 3, and a heating gas supply pipe 5 communicating with the heating gas supply source 4 is provided on the rear wall 3b, and a part of the furnace 3 is discharged from the hole 2a of the cylinder 2. A discharge port 3c is provided for discharging the thermal decomposition product and the heated gas. The heated gas supply pipe 5 communicates with the hollow portion of the hollow shaft 1 through the hollow rotary shaft 6. Reference numeral 7 denotes a rotary shaft that penetrates the front wall 3a and is connected to the rotational power 8. Reference numeral 9 denotes a detachable bearing provided between the cylinder 2 and the rotary drive shaft 10.
[0020]
In the embodiment thus configured, the front wall 3a of the hatch mechanism and the detachable bearing 9 are removed, and the cylinder 2 is taken out of the furnace 3. The removed front plate 2b of the cylinder 2 is removed, and an appropriate amount of waste FRP pieces is filled and the front plate 2b is closed. Next, the cylinder 2 is placed in the furnace 3, the desorption bearing 9 is fitted in the furnace 3, and then the front wall 3 a is fitted to seal the furnace 3.
[0021]
Next, the heated gas 11 supplied from the heated gas supply source 4 is supplied into the hollow shaft 1 through the heated gas supply pipe 5 and the hollow rotary shaft 6. The heated gas 11 supplied into the hollow shaft 1 enters the cylinder 2 from the hole 1a of the hollow shaft 1 and heats the waste FRP pieces in the cylinder 2 through the holes 2a of the cylinder 2 while heating the waste FRP pieces in the cylinder 2. The gas is discharged from the discharge port 3 c of the furnace 3. When the air or the like in the cylinder 2 is discharged, the heated gas 11 that has reached the thermal decomposition temperature from the heated gas supply source 4 while driving the rotational power 8 and applying a change in centrifugal force and gravity to the waste FRP piece. Continuously supplied to the hollow shaft 1. The heated gas 11 creates a flow from the hole 1a of the hollow shaft 1 to the center of the cylinder 2 and in the circumferential direction from the center to make the temperature inside the cylinder 2 uniform, and the heated FRP 11 thermally decomposes the waste FRP pieces. In this way, it is separated into a non-decomposed component (residual core material) and a gasification component or a liquid component which is a thermal decomposition product.
[0022]
In this case, the remaining core material of the waste FRP piece can be reused almost as it is by adjusting the rotational speed to the waste FRP piece by operating the rotational power 8 and causing the centrifugal force to act more than gravity and preventing the drop due to gravity. Separate with easy shape. Further, the number of revolutions to the waste FRP piece is adjusted by operating the rotational power 8, and the centrifugal force and gravity change and the elasticity of the waste FRP piece are combined to vibrate (for example, at a turning radius of 25 centimeters per minute). The waste FRP piece to be rotated 60 times receives almost zero gravity and double gravity each time.) The heated gas 11 is uniformly permeated between the waste FRP pieces. As a result, heat transfer is improved and waste FRP pieces can be efficiently thermally decomposed. On the other hand, the gasification component 11a is discharged into the furnace 3 from the hole 2a on the outer periphery of the cylinder 2 and is discharged from the discharge port 3c of the furnace 3. The gasification component 11a includes the heated gas 11 and a thermal decomposition product, and the thermal decomposition product includes a liquid component and a gasification component.
[0023]
On the other hand, non-decomposing components (residual core material) such as glass fibers remaining in the cylinder 2 remove the front wall 3a and the detachable bearing 9 again, take the cylinder 2 out of the furnace 3, remove the front plate 2b, and remove the non-decomposition component in the cylinder 2. The decomposition component (residual core material) is taken out with almost the same shape and less deterioration in strength. The extracted non-decomposed component (residual core material), that is, glass fiber or the like is reused as the FRP core material. Moreover, it is reused by mixing with cement etc. and obtaining concrete with high tensile strength.
When the non-decomposed component (residual core material) is taken out from the cylinder 2, the above operation is repeated again.
[0024]
Next, Embodiment-2 to Embodiment-4 of the present invention will be described with reference to FIGS.
FIG. 2 is a cross-sectional view of Embodiment-2 to Embodiment-4, and FIG. 3 is a cross-sectional view taken along arrow III-III. 2 and 3 that are the same as those in FIG. 1 are equivalent to those in FIG.
2 and 3, an outer cylinder 2 </ b> A is provided concentrically with the cylinder 2 on the outer peripheral side of the cylinder 2 as a rotating container that rotates around the horizontal axis. Reference numeral 9 a denotes a detachable bearing provided between the inner side of the outer cylinder 2 </ b> A and the rotary drive shaft 10. Reference numeral 12 a denotes a guide pipe for guiding a gasification component 11 a passing between the cylinder 2 and the outer cylinder 2 A. The guide pipe 12 a passes through the discharge port 3 c of the furnace 3. 13 is a storage tank for liquid components and the like provided in the middle of the induction pipe 12a, 12b is an induction pipe from the storage tank 13 to the primary cooling fractionation apparatus 14, and the primary cooling fractionation apparatus 14 is a gas flowing through the induction pipe 12b. A primary cooling fractionation device 15 for cooling the fractionated component 11b and storing the fractionated fraction, 15 is provided on the downstream side of the primary cooling fractionation device 14 and is gasified to flow from the primary cooling fractionation device 14 through the induction pipe 12c. This is a secondary cooling fractionation device that cools the components 11c and stores fractionated fractions. Reference numeral 12d denotes a guide pipe for flowing the gasification component 11d from the secondary cooling fractionator 15, and the guide pipe 12d is connected to the suction side of the circulation pump 16 and communicates with the guide pipe 12e for flowing the gasification component 11e. is doing. Reference numeral 17 denotes an exhaust pipe for the gasification component 11e or the like, which is branched from the induction pipe 12e. An exhaust valve 17a is interposed in the exhaust pipe 17 and is connected to a guide pipe 12e through which the gasification component 11e on the discharge side of the circulation pump 16 flows. Reference numeral 18 denotes a flow rate adjusting valve that is interposed downstream from the branch point of the exhaust pipe 17, and 19 is an air supply pipe that is provided on the downstream side of the flow rate adjusting valve 18 and branches to the induction pipe 12 f. 19 is provided with an air supply valve 19a. The induction tube 12 f is connected to the gas heating tube 5 a of the heating gas 11. Further, 20 is a combustion chamber, 20a is a combustion chamber upper floor, 20b is a plurality of combustion gas discharge ports provided in the combustion chamber upper floor 20a, and 21 is a combustion apparatus installed in the combustion chamber 20. Reference numeral 22 denotes a heating chamber provided between the combustion chamber upper floor 20a and the outer cylinder 2A. In the heating chamber 22, a gas heating pipe 5 a penetrating the furnace 3 is disposed above the combustion gas discharge port 20 b, and the gas heating pipe 5 a is bent upward and communicates with the heating gas supply pipe 5. .
[0025]
In the embodiment thus configured, the waste FRP piece is thermally decomposed by using water vapor as the heating gas 11 in the manner shown in the embodiment-1. First, waste FRP pieces are filled into the cylinder 2 and sealed with the hatch mechanism 3A, the flow rate adjustment valve 18 is closed, the exhaust valve 17a is opened, and the cylinder 2 is filled with water vapor from the supply pipe 19 into the heating gas circulation system. Is rotated with the power 8 for rotation. In addition, the combustion device 21 is activated to ignite the fuel and start combustion in the combustion chamber 20. Next, when the air is exhausted from the exhaust pipe 17, the supply of water vapor from the air supply pipe 19 is stopped, the circulation pump 16 is started, the opening degree of the flow rate adjusting valve 18 and the exhaust valve 17a is adjusted, and the heated gas 11 Adjust the pressure and flow rate in the circulation system. Further, by adjusting the combustion device 21, the temperature and amount of the combustion gas ejected from the combustion gas discharge port 20 b that hits the gas heating pipe 5 a in the heating chamber 22 are adjusted. In this way, the temperature of the heated gas 11 is controlled to start the heat treatment.
[0026]
By this thermal decomposition, the gasified component 11a of the waste FRP piece is discharged from the hole 2a on the outer periphery of the cylinder 2 and guided to the guide pipe 12a through the space path between the cylinder 2 and the outer cylinder 2A. 13 and separated. And the gasification component etc. 11b of the induction pipe 12b is cooled by the primary cooling fractionation apparatus 14, and when the gasification component etc. 11b is cooled to about 190 degreeC, a phthalic acid etc. will be fractionated. Next, the gasification component 11c that is not fractionated by the primary cooling fractionator 14 is guided to the secondary cooling fractionator 15 via the induction pipe 12c. When the gasification component 11c is cooled to about 140 ° C., styrene and the like are fractionated. Furthermore, the gasification component 11d not fractionated by the secondary cooling fractionator 15 is guided to the induction pipe 12d and pressurized by the circulation pump 16. Then, the pressure of the gasification component 11e guided to the induction pipe 12e is adjusted by the opening degree of the exhaust valve 17a. On the other hand, the recirculated gasification component 11e is adjusted in flow rate by the opening degree of the flow rate adjusting valve 18, and the water vapor (heating gas 11) and the unreacted gas (gasified component that has not been subjected to cooling fractionation) are again treated as unreacted gas. Is referred to as the heating gas 11f to the gas heating pipe 5a and re-aired as the heating gas 11 until the heat treatment is completed.
[0027]
Next, when the heat treatment is completed, the combustion device 21 is stopped and the flow rate adjusting valve 18 is closed while the temperature of the heated gas 11 is lowered. Then, while supplying water vapor from the air supply pipe 19, the water vapor and unreacted gas are discharged from the exhaust pipe 17 to fill the cylinder 2 with new water vapor. Next, the supply of water vapor from the supply pipe 19 is stopped, the circulation pump 16 is stopped, the rotational power 8 is stopped, and the rotation of the cylinder 2 is stopped. Further, with the cooling of the furnace 3, the inside of the cylinder 2 is replaced with air from the air supply pipe 19 to open the hatch mechanism 3A.
In this case, if unreacted gas discharge is an environmental problem, water vapor and unreacted gas are separately stored in a gas processing device (not shown) and burned as a heating heat source for the heated gas at the time of re-operation in the present embodiment. .
[0028]
Embodiment 3 of the present invention will be described.
3, reference numerals 23a, 23b, 23c,... Are a plurality of guide vanes provided on the outer peripheral surface of the cylinder 2 at appropriate intervals in the circumferential direction. The guide blades 23 a, 23 b, 23 c,... Provided at appropriate intervals in the circumferential direction are extended in the axial direction of the cylinder 2.
Because of the guide vanes 23a, 23b, 23c,..., The gasification component 11a discharged from the hole 2a of the cylinder 2A rotates in the outer cylinder 2A while being forced to flow, so the outer cylinder 2A and the cylinder 2 can be exchanged with heat to equalize the temperature inside the outer cylinder 2A. As a result, the thermal decomposition efficiency of the waste FRP piece can be increased.
[0029]
Embodiment 4 of the present invention will be described.
3, 24a, 24b, 24c,... Are partition plates provided in a plurality of radial shapes in the axial direction inside the cylinder 2. In FIG. The cylinder 2 is reinforced by the partition plates 24a, 24b, 24c,... And divided into a plurality of compartments 25a, 25b, 25c,. Can be limited. Further, the temperature unevenness of the heated gas 11 hitting the waste FRP piece is reduced, and the reuse of the waste FRP piece is made more efficient.
In addition, in order to improve the alternating current of the heating gas 11 between 25a, 25b, 25c, ..., you may provide a some hole in the partition plates 24a, 24b, 24c, ....
[0030]
Next, Embodiment-5 and Embodiment-6 of the present invention will be described with reference to FIGS.
FIG. 4 is a cross-sectional view of Embodiment-5 and Embodiment-6.
FIG. 5 is a cross-sectional view taken along the line VV.
4 and 5 that are the same as those in FIGS. 1 to 3 are equivalent to those in FIGS.
Reference numeral 26 denotes a spray nozzle of the primary cooling fractionator. Reference numeral 27 denotes a spray nozzle of the secondary cooling fractionator. 28 is a gas-liquid separator provided on the downstream side of the induction pipe 12d through which the gasification component 11d from the secondary cooling fractionator 15 flows and a condenser of the gasification component 11d (hereinafter referred to as a gas-liquid separator). 28a is a condenser in the gas-liquid separator 28, which is a heat exchange device for the gasification component 11d and the like, and 28b is a saturated liquid in which the gasification component 11d is liquefied. Further, 12 g is an induction pipe of 11 g of gasified components and the like separated by the gas-liquid separator 28 and is connected to the suction side of the circulation pump 16. Reference numeral 12 h denotes a gasification component 11 h induction pipe pressurized by the circulation pump 16 and is connected to the discharge side of the circulation pump 16. Reference numeral 29 denotes a main condenser of the unreacted gas and the heated gas which is branched to the induction pipe 12h and connected to the exhaust pipe 17 having an exhaust valve 17a interposed therebetween.
[0031]
In the embodiment configured as described above, the spray water (the latent heat of evaporation of water and the pyrolysis gas) in which the ejection amount is adjusted from the spray nozzle 26 of the primary cooling fractionator in the manner described in the above embodiment-2. The heat is exchanged with the latent heat of condensation.) Is directly sprayed on the gasification component 11b and the like is cooled and fractionated. In addition, the gasification component 11c or the like led to the secondary cooling fractionator 15 through the induction pipe 12c is sprayed with spray water directly from the spray nozzle 27 of the secondary cooling fractionator to cool and fractionate. Further, the gasified component 11d not fractionated by the secondary cooling fractionator 15 is again separated into the gasified component 11g and the liquid component by the gas-liquid separator 28 through the induction tube 12d. Further, the sprayed and evaporated water vapor is cooled by a heat exchange device 28a installed in the gas-liquid separator 28, recovered as saturated water 28b, and stored in a certain amount in the gas-liquid separator 28 while being reused as spray water ( The saturated liquid evaporates and stabilizes the pressure in the vessel when the pressure drops. Further, the gasification component 11g is guided to the induction pipe 12g and pressurized by the circulation pump 16, and the pressure of the gasification component 11h guided to the induction pipe 12h is adjusted by the opening degree of the exhaust valve 17a. 17 is exhausted. A part of the gasified component 11h is appropriately condensed and separated by the main condenser 29. On the other hand, the recirculated gasification component 11i of the induction pipe 12i is adjusted to the flow rate by the opening degree of the flow adjustment valve 18, and is again guided to the gas heating pipe 5a as the heated gas (water vapor and unreacted gas) 11i and retransmitted. Let me know.
[0032]
When the heat treatment is completed, the flow rate adjusting valve 18 is closed, new water vapor is supplied from the air supply pipe 19, and 11 g of the gasification component containing the newly supplied water vapor is supplied to the exhaust pipe 17 using the circulation pump 16. Is injected into the main condenser 29, and water vapor is liquefied to separate unreacted gas. In this way, the unreacted gas is also separated and stored and reused as a heating source.
[0033]
Embodiment 6 of the present invention will be described.
4 and 5, reference numeral 30 denotes an air supply pipe having a plurality of air ejection holes 30a. The air supply pipe 30 is provided in the heating chamber 22 below the gas heating pipe 5a, and a part thereof is heated. It passes through the chamber 22 and is connected to the air supply device 31 outside the furnace 3.
A plurality of electromagnetic wave irradiation devices 32 that irradiate the inside of the cylinder 2 with electromagnetic waves are provided on the outer peripheral surface of the hollow shaft 1 at appropriate intervals in the circumferential direction. Further, a plurality of springs 33 are provided at equal intervals over the entire inner peripheral surface of the cylinder 2. For example, a plate spring is used as the spring 33.
[0034]
In such a configuration, in order to control the temperature of the heating gas 11, the air supplied from the air supply device 31 is ejected from the air ejection hole 30 a of the air supply pipe 30 to the gas heating pipe 5 a heated by the combustion gas. Thus, the temperature of the heated gas 11 in the gas heating pipe 5a can be controlled to a higher degree by adjusting the amount of air ejected from the air ejection hole 30a. Thus, by adjusting the temperature and flow rate of the heating gas 11, the amount of heat given to the waste FRP piece by the heating gas 11 can be adjusted, and the pyrolysis gasification reaction rate can be adjusted. In addition, when there is a possibility that harmful substances are generated in the thermal decomposition product of the waste FRP piece, the property of the thermal decomposition product in the decomposition generation stage is changed by changing the type and chemical properties of the heated gas 11. It can be adjusted and detoxified.
[0035]
Furthermore, since the waste FRP piece inside the cylinder 2 is heated by the electromagnetic wave irradiated from the electromagnetic wave irradiation device 32, thermal decomposition can be accelerated. Further, the spring 33 can be vibrated by a change in centrifugal force and gravity, and the waste FRP piece stuck to the spring 33 can be vibrated minutely to accelerate thermal decomposition.
[0036]
[Effect of the embodiment]
1) Adjust the number of rotations of the horizontal cylinder 2 to give centrifugal force to the waste FRP pieces, and vibrate by the fluctuation of (centrifugal force + gravity) and (centrifugal force-gravity) every rotation, and between the waste FRP pieces Since the heated gas 11 is permeated evenly, the waste FRP pieces can be thermally decomposed efficiently.
2) The decomposition rate of the thermal decomposition of the waste FRP piece can be adjusted by adjusting the temperature and flow rate of the heating gas 11 with the amount of heat necessary for the thermal decomposition of the waste FRP piece.
3) Since the thermal decomposition of the waste FRP pieces can be processed at a low temperature and a constant temperature, the components of the thermal decomposition products are stable and can be easily recycled.
4) The glass fiber of the non-decomposed component of the waste FRP piece does not expand due to the rotation of the cylinder 2, and it is easy to recycle due to low temperature treatment with little deterioration in strength.
5) Since the gasification component etc. of the waste FRP piece is cooled and fractionated, and the raw gas, styrene, etc. can be reused as the heat source for heating the heating gas 11 for thermal decomposition of the waste FRP piece, the recycling efficiency is good.
6) The thermal decomposition products of the waste FRP pieces are separated and fractionated, processed in a circulation system in which the heat treatment is almost closed by condensation separation of heated gas, etc., and further, the kind and chemical properties of the heated gas 11 are changed. No harmful substances are discharged to the outside due to thermal decomposition.
7) Since the waste FRP piece is vibrated by the rotation of the cylinder 2, the vibration device is simple and the noise is low. Moreover, power consumption can be reduced due to the rotational motion.
8) The flow of the gasification component 11a etc. of the waste FRP piece can be forced to the cylinder 2 by the guide vanes 23a, 23b, 23c,..., And the temperature of the waste FRP piece is made uniform by uniformizing the temperature in the outer cylinder 2A. Decomposition efficiency can be increased.
9) By providing the compartments 25a, 25b, 25c,... In the cylinder 2, the waste FRP pieces can be filled uniformly, the cylinder 2 can be reinforced, and the bias at the time of starting rotation can be limited. Further, the temperature variation of the waste FRP piece can be eliminated and the waste FRP piece can be thermally decomposed uniformly.
10) The heat exchange efficiency can be improved by spraying water directly and performing heat exchange in a cooling method in which the gasification components 11b and 11c are fractionally distilled using steam as the heating gas 11. Moreover, the cooling fractionator 14 and the secondary cooling fractionator 15 can be simplified, the heat exchange speed is fast, and the fractionation temperature of the gasification component of the waste FRP piece can be easily controlled by adjusting the spray amount.
11) The combustion chamber 20 is provided in the furnace 3, and the furnace 3 encloses the outer cylinder 2A, whereby the outer cylinder 2A can be heated and insulated from the outside. Further, unnecessary residues such as unrunned gas can be incinerated at high temperature in the combustion chamber 20 and completely burned, and can be used as a heating source of the heated gas 11.
12) By providing the gas-liquid separator 28, the inflow of the liquid component (such as water) can be restricted to the circulation pump 16, and the presence of a saturated liquid such as saturated water 28b in the gas-liquid separator 28 The pressure fluctuation can be reduced.
[0037]
【The invention's effect】
1) Adjust the rotational speed of the horizontal cylinder to give centrifugal force to the waste plastic piece, vibrate it by the fluctuation of (centrifugal force + gravity) and (centrifugal force-gravity) every rotation, and heat the waste plastic piece By uniformly infiltrating the resin, the heat transfer is improved, and the waste plastic piece can be efficiently thermally decomposed at a constant temperature that is low enough to be thermally decomposed.
2) The decomposition rate of thermal decomposition can be adjusted by adjusting the temperature and flow rate of the heated gas to the amount of heat necessary for the thermal decomposition of the waste plastic piece.
3) When there is a possibility that harmful substances may be generated in the pyrolysis products of waste plastic pieces, supply by changing the type and chemical properties of the heated gas and adjusting the properties of the pyrolysis products to make them harmless It becomes possible to do.
4) Since the thermal decomposition of the waste plastic piece can be processed at a constant temperature, the components of the thermal decomposition product are stable, and the recycling of the substance obtained by cooling and fractionating the liquid component and the gasification component is facilitated.
5) By adjusting the rotational speed of the cylinder, the glass fiber or the like of the non-decomposing component of the waste plastic piece does not expand, and the low-temperature treatment makes it easy to reuse because there is little deterioration in strength.
6) Since the thermal decomposition product of the waste plastic piece is processed in a circulation system in which the heat treatment is almost closed by separation / distillation, condensation of heated gas, etc., no harmful substances are discharged.
7) Since the waste plastic piece is vibrated by the rotation of the cylinder, the vibration device is simple and the noise is low. Moreover, power consumption can be reduced due to the rotational motion.
8) By attaching guide vanes to the cylinder, the flow of the pyrolysis product of the waste plastic piece can be forced, and the temperature in the rotating system can be made uniform to increase the thermal decomposition efficiency of the waste plastic piece.
9) By providing the compartment in the cylinder, it is possible to uniformly fill the waste plastic piece, to reinforce the cylinder, and to limit the bias at the start of rotation. Further, the temperature unevenness of the waste plastic piece can be eliminated, and the waste plastic piece can be thermally decomposed uniformly.
10) By providing the electromagnetic wave irradiation device for irradiating the electromagnetic wave inside the cylinder, the thermal decomposition of the waste plastic piece can be accelerated.
11) By providing springs on the inner peripheral surface of the cylinder at appropriate intervals, the springs vibrate slightly due to fluctuations in centrifugal force and gravity, and the waste plastic pieces stuck to the springs vibrate slightly to accelerate thermal decomposition. be able to.
12) By using an inert gas such as water vapor as the heating gas, oxidation, combustion and explosion of the thermal decomposition product can be prevented.
13) Since the heat treatment can be performed under almost atmospheric pressure, the structure of the apparatus is simple and the manufacturing cost can be reduced.
As described above, according to the present invention, waste plastic pieces can be efficiently heat-treated.
Further, the processed product obtained by the present invention can be efficiently recycled.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of Embodiment-1 of the present invention.
FIG. 2 is a cross-sectional view of Embodiment-2 to Embodiment-4 of the present invention.
3 is a cross-sectional view taken along arrow III-III in FIG. 2;
FIG. 4 is a cross-sectional view of Embodiment-5 and Embodiment-6 of the present invention.
5 is a cross-sectional view taken along arrow VV in FIG. 4;
[Explanation of symbols]
1: hollow shaft, 1a: hole
2: cylinder, 2A: outer cylinder
2a: hole, 2b: front plate, 2c: rear plate
3: furnace, 3a: front wall, 3b: rear wall, 3c: outlet
3A: Hatch mechanism
4: Heated gas supply source
5: heating gas supply pipe, 5a: gas heating pipe
6: Hollow rotating shaft
7: Rotating shaft
8: Power for rotation
9, 9a: Desorption bearing
10: Rotation drive shaft
11: heated gas
11a, 11b, 11c, 11d, 11e, 11f, 11g, 11h, 11i: gasification components, etc.
12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i: induction tube
13: Reservoir
14: Primary cooling fractionator
15: Secondary cooling fractionator
16: Circulation pump
17: exhaust pipe, 17a: exhaust valve
18: Flow rate adjustment valve
19: Air supply pipe, 19a: Air supply valve
20: Combustion chamber, 20a: Upper floor of combustion chamber, 20b: Combustion gas discharge port
21: Combustion device
22: Heating chamber
23a, 23b, 23c: guide vanes
24a, 24b, 24c: Partition plate
25a, 25b, 25c: compartment
26: Spray nozzle of primary cooling fractionator
27: Spray nozzle of secondary cooling fractionator
28: Gas-liquid separator, 28a: Heat exchange device, 28b: Saturated liquid
29: Main condenser
30: Air supply pipe, 30a: Air ejection hole
31: Air supply device
32: Electromagnetic wave irradiation device
33: Spring

Claims (8)

While supplying a suitable amount of waste FRP pieces to a rotating container placed in the furnace and rotating it around a horizontal axis, the rotating container is rotated at a low speed at the initial stage of rotation, and the above-mentioned inside of the container is rotated. Freely drop the waste FRP piece to allow the heated gas to uniformly penetrate the entire waste FRP piece in the container, and after reaching the thermal decomposition temperature, increase the rotation of the rotating container so that the waste FRP piece does not fall freely. with waste FRP pieces stuck waste FRP pieces to the inner peripheral surface of the rotating container by centrifugal force prevent the rotation, the waste FRP pieces stuck to the inner peripheral surface of the rotating container by utilizing the variation of the centrifugal force and gravity A method of thermally decomposing a horizontal cylindrical rotary waste FRP , wherein the thermal decomposition is performed by internal vibration to improve heat transfer with a heat medium such as a heated gas or a pyrolysis product. Horizontal置円cylinder rotary waste FRP method pyrolysis of claim 1, wherein the separation fractionation as recycling was removed pyrolysis products of the waste FRP strip from the furnace. The horizontal cylindrical rotary waste FRP according to claim 1 , wherein a pipe is provided at an opening for discharging the pyrolysis product and the heated gas, and the pipe passes through a cooling device that cools and fractionates the gasification component at each condensation temperature. Thermal decomposition method. An outer cylinder is provided with an appropriate gap on the outer periphery of a cylinder as a rotating container, and a plurality of forcing the flow of pyrolysis products of the waste FRP pieces at an appropriate interval in the circumferential direction on the outer peripheral surface of the cylinder. The thermal decomposition method of the horizontal cylinder rotation waste FRP of Claim 1 which provided the guide blade. The method for thermally decomposing horizontal cylindrical rotary waste FRP according to claim 1 , wherein a plurality of partition plates are provided radially in the axial direction inside a cylinder as a rotary container. The thermal decomposition method of the horizontal cylinder rotation type waste FRP of Claim 1 which provided the electromagnetic wave irradiation apparatus which irradiates the electromagnetic wave which accelerates | stimulates thermal decomposition inside the cylinder as a rotation container. The thermal decomposition method of a horizontal cylindrical rotary waste FRP according to claim 1, further comprising a spring for causing micro-vibration of the waste FRP pieces attached to the inner peripheral surface of a cylinder as a rotary container at an appropriate interval to accelerate thermal decomposition. 4. The thermal decomposition method for a horizontal cylindrical rotary waste FRP according to claim 3 , wherein the cooling fraction of the cooling device is provided with a spray nozzle for directly spraying spray water onto the gasification component of the thermal decomposition product and cooling it.

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