Adsorption particle regeneration device

Abstract

To provide a method for efficiently regenerating adsorbent particles contaminated with organic matter such as chemicals, food, oil, etc., and for efficiently using energy used for regeneration. [Solution] Adsorbent particles with organic matter attached or adsorbed thereto are fed into an adsorbent particle regeneration device having a double-tube screw feeder, and the organic matter adsorbed on the adsorbent particles is vaporized or oxidatively decomposed as it passes through a heating section, thereby regenerating the adsorbent particles and restoring their organic adsorption performance. To effectively utilize the heat from the heated adsorbent particles, the high-temperature regenerated adsorbent particles are heat exchanged in the outer tube of the feed section with pre-regenerated adsorbent particles present in the inner tube of the feed section, thereby efficiently regenerating the adsorbent particles.

Description

[Technical Field]

[0001] The present invention relates to a heating and regenerating device for adsorbent particles that have adsorbed organic matter such as food residue and oil. [Background technology]

[0002] There are three methods for recycling waste plastics: material recycling, chemical recycling, and thermal recycling. Chemical recycling, for example, involves turning plastics into oil. However, the process of returning high-molecular-weight plastics to a low-molecular-weight state is an endothermic reaction that requires the supply of energy, and new energy is required to heat the plastic to approximately 400°C. In addition, to commercialize the product, an additional process is required to separate and refine the crude oil-like product, which requires additional equipment. Furthermore, there is always a risk of fire or explosion during the oil-making process, and measures must be taken to prevent this, so there are issues with cost and safety. Thermal recycling involves incinerating waste plastics and reusing the energy generated during the incineration process. This process generates carbon dioxide and other harmful substances, which can lead to air pollution and adverse effects on global warming. On the other hand, material recycling is a technology that uses waste plastic as a raw material to create new products, which generates less carbon dioxide and has less impact on global warming. Traditionally, material recycling has mainly targeted industrial waste plastics, but with the enforcement of the Containers and Packaging Recycling Law, general waste plastics from households and other sources have also become eligible for recycling.

[0003] Pretreatment technology is crucial for the material recycling of waste plastics. Pretreatment technologies can be divided into five stages: (1) cutting, crushing, and pulverization; (2) separation and sorting; (3) washing; (4) dehydration and drying; and (5) blending and mixing. Waste plastics are often contaminated with chemicals, food residues, oil, and other contaminants, and therefore require cleaning. While cleaning methods vary depending on the desired quality and the type of contamination, water washing, hot water washing, or detergents are commonly used. However, water-based cleaning methods often fail to adequately remove substances that are difficult to dissolve in water or are sticky. Furthermore, when using water, the wastewater from the cleaning process contains large amounts of COD components and SS, which cannot be discharged as is, resulting in significant time and cost involved in its treatment.

[0004] For example, in order to improve cleaning performance, a method has been proposed in which crushed pieces of waste plastic are fed into a rotating drum through its inlet while water is being supplied, and then stirred and washed together with stirring aids such as gravel and metal balls inside the drum (Patent Document 1). In this method, the stirring aids collide repeatedly with the surfaces of the crushed pieces of waste plastic, and the pieces are stirred by water, so it is thought that even materials that are difficult to dissolve in water or that are sticky can be washed more efficiently than with simple water or warm water washing.

[0005] However, in such wet processes using water, the wastewater contains large amounts of COD, BOD, SS, etc., and treatment of the wastewater is necessary to remove these components, which poses the problem of requiring a great deal of time and cost.

[0006] Furthermore, in this method, the stirring aid used gradually becomes contaminated with waste plastic, making it necessary to replace the stirring aid periodically. However, discarding the contaminated stirring aid is not desirable in terms of cost and also causes undesirable problems from an environmental standpoint. Therefore, when using stirring aids such as gravel or metal balls for cleaning, it is preferable to reuse the contaminated stirring aid.

[0007] Patent Document 2 discloses an apparatus for agitating and mixing waste plastic flakes with food residue and other contaminants attached thereto with adsorbent particles in an agitator, allowing the adsorbent particles to adsorb the contaminants attached to the waste plastic flakes, and obtaining waste plastic from which the contaminants have been removed. It also discloses a recycling apparatus for heating the adsorbent particles with the adsorbent particles adsorbed thereto, thereby obtaining recycled adsorbent particles from which the contaminants have been removed, and the use of a screw conveyor as the recycling apparatus. This method does not require water and is a dry process that can remove deposits from waste plastic flakes, etc., so it has the advantage of not requiring wastewater treatment compared to wet processes that use water. However, in this method, the adsorption particles are heated to a high temperature for regeneration and then cooled by air transport. This means that the thermal energy applied when heating the adsorption particles is dissipated into the air, which poses a problem in terms of effective energy utilization. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-136936 [Patent Document 2] Japanese Patent Application Publication No. 2023-157785 Summary of the Invention [Problem to be solved by the invention]

[0009] Thermal regeneration of adsorbent particles requires heating the particles to high temperatures to vaporize and oxidize the organic matter adsorbed on a large amount of the particles, resulting in the use of a large amount of energy. In Patent Document 2, the regenerated adsorbent particles are heated to 350 to 400°C, then cooled to 100 to 220°C by pneumatic transport before being returned to the agitator, resulting in the use and loss of a large amount of thermal energy.

[0010] The main problem to be solved by the present invention is to provide a method for efficiently regenerating adsorbent particles contaminated with organic matter such as chemicals, food, and oil, while efficiently using the energy used for regeneration. [Means for solving the problem]

[0011] The means for solving the above problems are as follows. (First aspect)

[0012] An adsorbent particle regeneration device having a screw feeder with a double-pipe structure, The screw feeder , suck an inlet through which the adsorbed particles are introduced into the inner tube of the double-layered structure of the screw feeder, and an outlet through which the adsorbed particles are discharged from the outer tube of the double-layered structure of the screw feeder; the screw feeder has an inner tube screw feeder provided in an inner tube and an outer tube screw feeder provided in an outer tube, The adsorption particle regeneration device has a heating section that heats the screw feeder from the outside, and a The aforementioned Adsorption particles and before heating The aforementioned The adsorption particles have an inlet section where heat is exchanged, The adsorption particles introduced into the inner pipe are transferred to the heating section by the inner pipe screw feeder, then transferred into the outer pipe through a transfer port provided in the inner pipe wall in the heating section, and further transferred from the heating section to the feeding section by the outer pipe screw feeder, where they exchange heat with the adsorption particles in the inner pipe and are then discharged from the discharge port. Adsorbed particle regeneration device.

[0013] (Second aspect) An adsorbent particle regeneration device having a screw feeder with a double-pipe structure, The screw feeder , suck an inlet through which the adsorbed particles are introduced into the inner tube of the double-layered structure of the screw feeder, and an outlet through which the adsorbed particles are discharged from the outer tube of the double-layered structure of the screw feeder; the screw feeder has an inner tube screw feeder provided in an inner tube and an outer tube screw feeder provided in an outer tube, The adsorption particle regeneration device has a heating section that heats the screw feeder from the outside, and a The aforementioned Adsorption particles and before heating The aforementioned The adsorption particles have an inlet section where heat is exchanged, The adsorption particles introduced into the inner pipe are transferred to the heating section by the inner pipe screw feeder, then transferred into the outer pipe through a transfer port provided in the inner pipe wall in the heating section, and further transferred from the heating section to the feeding section by the outer pipe screw feeder, where they exchange heat with the adsorption particles in the inner pipe and are then discharged from the discharge port, The inner tube screw feeder provided in the inner tube and the outer tube screw feeder provided in the outer tube rotate in opposite directions. Adsorbed particle regeneration device.

[0014] (Third aspect) The blade located in the heating section of the outer tube screw feeder is a flat blade. In the first or second aspect The adsorbent particle regeneration device described.

[0015] (Fourth aspect) The outer tube screw feeder ,flat It has blades and an outer screw. The winding direction of the outer tube screw is different on both sides of the discharge port. In the first or second aspect The adsorbent particle regeneration device described.

[0016] (Fifth aspect) The adsorbent particle regeneration device according to the first or second embodiment, wherein the adsorbent particles are inorganic particles. [Effects of the Invention]

[0017] According to the present invention, it is possible to efficiently regenerate adsorbent particles contaminated with organic matter such as chemicals, food, and oil, and to efficiently use the energy used for regeneration. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is an external view of the adsorption particle regeneration device. [Figure 2] FIG. 2 is a schematic diagram of the inside of an outer tube of an adsorption particle regeneration device. [Figure 3] FIG. 2 is a schematic diagram of the inside of an inner pipe of an adsorption particle regeneration device. [Figure 4] FIG. 2 is a cross-sectional view taken along line OO in FIG. [Figure 5] FIG. 2 is a cross-sectional view taken along the line PP in FIG. [Figure 6] 3A is an enlarged view of part K in FIG. 2, and FIG. 3B is a schematic enlarged view of a flat blade of a second type. DETAILED DESCRIPTION OF THE INVENTION

[0019] Next, an embodiment of the present invention will be described. Note that this embodiment is an example of the present invention, and the scope of the present invention is not limited to the scope of this embodiment.

[0020] The present invention relates to a method for regenerating adsorbent particles after, for example, mixing waste plastic flakes, etc., having food residue or the like attached thereto with adsorbent particles in an agitator, and allowing the adsorbent particles to adsorb the attachments attached to the waste plastic flakes or the like. Examples of contaminants that may adhere to the surface include juice, yogurt, milk, mayonnaise, margarine, ketchup, dressing, cooking oil, other food-derived substances, detergent, shampoo, conditioner, cosmetics, deodorants, and other chemicals. In some cases, the surface may also adsorb organic pollutants such as organochlorine pesticides.

[0021] This adsorbent particle regeneration device 1 has a screw feeder with a double-pipe structure. Figure 1 shows an external view of the adsorbent particle regeneration device 1, Figure 2 shows a schematic diagram of the inside of the outer pipe, and Figure 3 shows a schematic diagram of the inside of the inner pipe. As shown in Figure 1, the adsorbent regeneration device 1 of the present invention has a heating section A and a feeding section B. Adsorption particles with organic matter attached or adsorbed thereto are introduced into the inner pipe 2 through the inlet 5. The introduced adsorption particles are transported by the inner pipe screw feeder 17 through the inlet B to the heating section A. The adsorption particles are then transferred into the outer pipe through the transfer port 11 provided in the inner pipe wall at the end of the inner pipe 2 in the heating section A. The adsorption particles transferred into the outer pipe are transported by the outer pipe screw feeder 18 through the heating section A to the inlet B, where they are heat exchanged and then discharged from the outlet 6. The inside of the outer tube refers to the area surrounded by the outer tube 3 and the inner tube 2, and the inside of the inner tube refers to the area surrounded by the inner tube 2 and the shaft 14. The heating section is heated to 300°C, and the adsorption particles with attached or adsorbed organic matter are vaporized or oxidatively decomposed as they pass through heating section A, and are regenerated, restoring their ability to adsorb organic matter.

[0022] In heating section A, a thin tube heater 12 is attached to the outer surface of the outer tube 3, which heats heating section A of the adsorption particle regeneration device 1. In heating section A, the adsorption particles are heated inside the inner and outer tubes, and organic matter such as food residue adsorbed to the adsorption particles is vaporized, oxidatively decomposed, and carbonized. In the feed section B, the post-thermal regeneration adsorption particles heated in the heating section A are transported in the direction of the feed section B by the outer tube screw feeder 18, and in the inner tube, the pre-thermal regeneration adsorption particles introduced from the inlet 5 are transported in the direction of the heating section A by the inner tube screw feeder 17. Therefore, the high-temperature post-thermal regeneration adsorbent particles present in the outer tube and the low-temperature pre-thermal regeneration adsorbent particles present in the inner tube exchange heat through the tube wall of the inner tube. As a result, the post-thermal regeneration adsorbent particles are cooled to an appropriate temperature and discharged from outlet 6 for reuse. The pre-thermal regeneration adsorbent particles are preheated in feed section B before reaching heating section A. Because the pre-thermal regeneration adsorbent particles are preheated before arriving at heating section A, they are efficiently heated in heating section A, allowing for the oxidative decomposition of attached organic matter to be carried out energy-efficiently. In this way, the adsorbent particles are efficiently regenerated.

[0023] (Internal tube screw feeder) As shown in Figure 3, the inner tube screw feeder 17 is disposed inside the inner tube, and the inner tube screw 17 is fixed around the shaft 14. In the example shown in Figure 3, the inner tube screw 17 is clockwise. The inner tube 2 has an inlet 5 through which adsorption particles that have adsorbed organic matter are introduced. The inner tube screw feeder 17 has a rotation mechanism 7, and the introduced adsorption particles are transported to the heating section A through the feed section B. In the example shown in Figure 3, the inner tube screw feeder 17 is rotated counterclockwise when viewed from the inlet 5 toward the heating section A, thereby transporting the adsorption particles toward the heating section A.

[0024] A transfer port 11 is provided in the wall of the inner tube 2 at the end of the heating section A to transfer the adsorption particles from the inner tube to the outer tube. The transfer is carried out by gravity or centrifugal force. Although the transfer port 11 is rectangular in FIG. 3, it may be other shapes such as elliptical or circular. One or more transfer ports 11 may be provided. To ensure smooth movement of the adsorption particles from the inner tube to the outer tube, it is preferable to provide multiple transfer ports 11. Alternatively, the area where the transfer port 11 is provided may be almost an opening, and the wall of the inner tube 2 may be continuous to the extent that it connects the end and center of the inner tube 2. In the example of FIG. 3, the screw diameter of the inner tube screw feeder 17 at the inlet C is smaller than the screw diameters at the feed section B and the heating section A, but they may be the same size.

[0025] (Outer tube screw feeder) As shown in Figure 2, an outer tube screw feeder 18 is disposed inside the outer tube. An outer tube screw 9 is fixed to the outside of the outer wall of the inner tube 2 in the feeding section B. A flat blade 10 is fixed to the outside of the wall of the inner tube 2 in the heating section A.

[0026] 2, the outer tube screw 9 is clockwise on the heating section A side of the discharge outlet 6 and counterclockwise on the inlet 5 side of the discharge outlet 6. The outer tube screw feeder 18 has a rotation mechanism 8, and is rotated clockwise when viewed from the inlet 5 toward the heating section A in order to transport the adsorption particles from the heating section A toward the discharge outlet 6. Thus, when viewed from the inlet 5 toward the heating section A along the screw feeder axis, if the inner tube screw feeder 17 rotates left, it is preferable that the outer tube screw feeder 18 rotate right. In other words, it is preferable that the inner tube screw feeder 17 and the outer tube screw feeder 18 rotate in opposite directions. This means that if the inner tube screw 15 is right-handed, the outer tube screw 9 from the inlet 5 toward the heating section is preferably right-handed. When the inner tube screw feeder 17 and the outer tube screw feeder 18 rotate in opposite directions, the adsorbed particles rotate in opposite directions within the inner and outer tubes, resulting in random proximity of the adsorbed particles within the outer and inner tubes via the inner tube, resulting in efficient heat exchange. This is because the adsorbed particles also function as a medium for heat conduction from the outer tube to the inner tube.

[0027] In the examples shown in Figures 2 and 5, the flat blades 10 have a rectangular shape that is long in the axial direction of the inner pipe 2, and one side is fixed to the wall of the inner pipe 2. In Figure 5, eight flat blades 10 are fixed to the wall of the inner pipe 2. The flat blades 10 are fixed so that the spacing between adjacent two flat blades 10 alternates between large and small. The spacing between the flat blades 10 may be the same, but by fixing them so that the spacing alternates between large and small, the movement of the adsorbent particles in the outer pipe becomes more random, making it easier for the adsorbent particles to be heated more uniformly, and improving regeneration efficiency. The flat blades 10 in the outer tube are fixed to the outer surface of the inner tube 2, and therefore also play a role in conducting heat from the outer tube 3 to the inner tube 2. From this viewpoint, a larger number of flat blades 10 is preferable, but if there are too many, stirring of the adsorption particles is hindered. Therefore, in the examples shown in Figures 2 and 5, the number of flat blades 10 is 2 to 12, preferably 4 to 10.

[0028] (heating part) In heating section A, the inside of the outer tube and the inside of the inner tube are heated by capillary heaters 12 arranged over the entire outer surface of the outer tube 3. The inside of the outer tube is heated first, and then the inside of the inner tube is heated using the adsorption particles and the blades of the outer tube screw feeder 18 as heat transfer media. The capillary heater 12 is covered with lagging 4, which is a heat-insulating material, and the inside thereof is kept warm.

[0029] Carbohydrates, proteins, etc. are thermally decomposed at temperatures above 270°C. Data has been obtained showing that heating at 270°C for 5 minutes or more causes evaporation, oxidative decomposition, and carbonization, and it has been confirmed that organic components are reduced by 90%. In the adsorbent particle regeneration device 1 of the present invention, the adsorbent particles are preferably heated and held at 300°C for 5 minutes or more. The heating temperature is preferably 300°C to 400°C. The heating holding time, i.e., the residence time of the adsorbent particles in heating section A, depends on the axial length of the screw feeder in heating section A, the volume of the space inside the inner tube, the volume of the space inside the outer tube, and the rotation speed of the screw feeder. Once the configuration of the adsorption particle regeneration device is determined, the heating retention time can be determined by controlling the rotation speed of the screw feeder. However, since the regeneration processing amount per unit time increases as the rotation speed of the screw feeder increases, the regeneration speed also increases. Therefore, to increase the regeneration speed per unit time, for example, the axial length of the screw feeder in heating section A can be increased. The regeneration speed can also be increased by increasing the volume of the inner tube space and the outer tube space. Here, the volume of the space inside the outer tube refers to the volume of the space surrounded by the outer tube 3 and the inner tube 2, and the volume of the space inside the inner tube refers to the volume of the part surrounded by the inner tube 2 and the shaft 14.

[0030] The blades inside the outer tube in heating section A are preferably flat blades 10. In heating section A, heating is performed by a capillary heater 12 disposed outside the outer tube 3. For this reason, it is preferable that the adsorbent particles come into contact with the inner wall of the outer tube 3 frequently. This is because contact with the inner wall of the outer tube 3 heats the adsorbent particles, promoting their regeneration. Furthermore, contact of the heated adsorbent particles with the flat blades 10 and the outer wall of the inner tube 2 promotes heat conduction into the inner tube. In the case of flat blades 10 as shown in Figures 2 and 5, the rotation of the blades causes the adsorbent particles to be subjected to centrifugal force in the direction of the wall of the outer tube 3. This increases the frequency of contact between the adsorbent particles and the wall of the outer tube 3, resulting in effective heating of the adsorbent particles.

[0031] The flat blades are preferably fixed at right angles to the outer wall of the inner tube, but may also be fixed at an angle inclined from 90 degrees, such as 80 degrees or 70 degrees. It is also preferable that multiple flat blades are fixed, but they may each be fixed at a different angle to the outer wall of the inner tube 2.

[0032] 2 and 5, the flat blade 10 disposed inside the outer tube has a rectangular shape, is fixed substantially perpendicularly to the outer wall of the inner tube 2, and is provided along the entire heating section A of the inner tube 2. However, it may be provided in a shorter section, or a single flat blade may be divided into multiple pieces and arranged in a row with spaces between them. In the example shown in FIG. 6(A), a single continuous flat blade 10 is fixed along the axis of the screw feeder, but in the example of the second embodiment shown in FIG. 6(B), a single flat blade 10 is divided into three pieces. The flat blade 10 may be divided into two or five pieces and fixed. In the example shown in Figures 2 and 5, one flat blade 10 covers the entire heating section A, and eight flat blades 10 are fixed to the outer surface of the inner tube. The spacing between two adjacent flat blades 10 in the circumferential direction of the outer surface of the inner tube 2 is formed so that it alternates between large and small. This has the effect of making the movement of adsorbed particles within the outer tube more random, making it easier for the adsorbed particles to be heated uniformly. In addition, an outer tube screw feeder 18 is arranged within the outer tube, with an outer tube screw 9 fixed to the outer surface of the inner tube 2.

[0033] The inner tube screw 15 of the inner tube screw feeder 17 shown in Figure 3 is clockwise. In this case, when looking from the inlet to the heating section along the axis of the screw feeder, the inner tube screw feeder 17 rotates left, and the adsorbent particles are transported to the heating section A through the feeding section B. In this case, when viewed from the inlet to the heating section along the axis of the screw feeder, the outer tube screw feeder 18 preferably rotates to the right. Because the adsorbent particles move from the heating section to the feeding section within the outer tube, this means that the outer tube screw feeder 18 is preferably right-handed. When the inner tube screw feeder 17 and the outer tube screw feeder 18 rotate in different directions, the adsorbed particles rotate and move in opposite directions within the inner and outer tubes. This results in more efficient heat conduction from the outer tube 3 to the inner tube 2 than when they rotate and move in the same direction. When they rotate in the same direction, the relative movement between the adsorbed particles located in the outer tube and the adsorbed particles located in the inner tube via the inner tube 2 is small, which is disadvantageous in terms of uniform heat conduction, since the adsorbed particles themselves are responsible for conducting heat.

[0034] The heating section A may have a communication section (not shown) that connects the inside and outside of the outer tube. This allows the organic matter vaporized or oxidatively decomposed by heating to be released as gaseous matter to the outside, and also allows air to be taken in, which has the effect of accelerating the oxidative decomposition. Since the oxidatively decomposed organic matter may contain harmful gases such as NOx and SOx, in this case it is preferable to install an exhaust gas abatement system. Furthermore, an air inlet (not shown) may be provided to actively introduce air into the outer tube and inner tube of the heating section A. By actively introducing air, carbonization of organic matter attached to or adsorbed on the adsorption particles is suppressed, oxidative decomposition is promoted, and regeneration is carried out more efficiently. The communication section and air inlet section may be omitted because the presence of the communication section and air inlet section would cause heat to dissipate to the outside, potentially reducing thermal efficiency. Also, the air is brought into the heating section A along with the adsorption particles through the inner pipe 2, and the exhaust gas is exhausted to the outside from the outlet 6 through the outer pipe 3.

[0035] (feed section) The adsorbent particles introduced into the inner tube 2 are transported by the inner tube screw feeder 17 through the infeed section B to the heating section A. Meanwhile, in the outer tube, the thermally regenerated adsorbent particles are transported from the heating section A to the infeed section B by the outer tube screw feeder 18. In the heating section A, the adsorbent particles are heated to approximately 300°C. The thermally regenerated adsorbent particles in the outer tube that have been transported to the infeed section B exchange heat with the pre-thermal regeneration adsorbent particles in the inner tube through the wall of the inner tube 2 in the infeed section B. As a result, the thermally regenerated adsorbent particles are cooled, and the pre-thermal regeneration adsorbent particles are preheated, and the thermal energy is utilized effectively.

[0036] The cooled, thermally regenerated adsorbent particles are discharged from outlet 6 and reused. In the outer tube 3, the winding direction of the outer tube screw 9 is reversed on both sides of outlet 6. Therefore, even if the adsorbent particles sent from heating section A to outlet 6 pass through outlet 6 by adhering to the outer tube screw 9, they will be transported in the opposite direction and discharged from outlet 6.

[0037] As with heating section A, when viewed from the inlet side toward the heating section along the screw feeder axis, it is preferable that when the inner tube screw feeder 17 rotates to the left, the outer tube screw feeder 18 rotates to the right. If the inner tube screw feeder 17 and the outer tube screw feeder 18 rotate in different directions, the adsorbed particles will rotate and move in opposite directions within the inner and outer tubes. This results in more random heat exchange between the adsorbed particles in the outer tube and the adsorbed particles in the inner tube via the wall of the inner tube 2 than when they rotate and move in the same direction, and heat conduction from the outer tube 3 to the inner tube 2 will be more efficient. In this case, if the inner tube screw 15 of the inner tube screw feeder 17 is right-handed as shown in Fig. 3, the outer tube screw 9 located near the heating section A of the outer tube screw feeder 18 shown in Fig. 2 will be right-handed. This is because the adsorbed particles move from the heating section A to the feeding section B inside the outer tube.

[0038] 2 and 4, the adsorbent particle regeneration device 1 of the present invention has an outer tube screw feeder 18 inside the outer tube, with an outer tube screw 9 fixed to the outer surface of the inner tube 2. In the feeding section B, the outer tube screw 9 of the outer tube screw feeder 18 and the outer surface of the inner tube 2 come into contact with and are heated by the thermally regenerated adsorbent particles that have been heated and transported in the heating section A. Heat is then conducted into the inner tube, preheating the adsorbent particles before thermal regeneration inside the inner tube of the feeding section B.

[0039] The discharged thermally regenerated adsorption particles are cooled to a temperature suitable for the next recycling process by heat exchange with the pre-thermal regeneration adsorption particles in feed section B. For example, a process in material recycling of waste plastics can be considered as the next process. In material recycling, a process for removing organic matter, such as food residue, from waste plastic flakes and the like that has organic matter attached to them can be envisioned, in which the waste plastic flakes and the adsorption particles are stirred and mixed in a stirring device. In this case, the temperature after cooling is 100 to 250°C, preferably 150 to 200°C, and more preferably 150 to 180°C. If the thermally regenerated adsorbent particles are subjected to the stirring and mixing process at such a temperature, the adsorbent particles are mixed with waste plastic flakes while being heated. This softens organic matter, such as food residues, on the surface of the waste plastic flakes, making them more easily adsorbed onto the adsorbent particles. As a result, there is an advantage in that the cleaning efficiency of waste plastic flakes is improved within the stirring device.

[0040] The distance from the boundary between the heating section A and the feeding section B to the discharge outlet 6 in the feeding section B can be determined taking into consideration the temperature of the thermally regenerated adsorbent particles at the time of discharge, etc. To lower the temperature of the thermally regenerated adsorbent particles at the time of discharge, for example, the distance from the boundary between the heating section A and the feeding section B to the discharge section 6 may be increased.

[0041] On the other hand, the preheated pre-regeneration adsorbent particles are sent to heating section A, where they are heated to the regeneration temperature in a short time because they are preheated, and the heat provided by the capillary heater 12 is effectively utilized, resulting in reduced heating costs.

[0042] If the heating section A does not have a communication section that connects the inside and outside of the outer tube, vaporized organic matter such as food residue that has adhered to or been adsorbed onto the adsorption particles and oxidative decomposition products are exhausted from the adsorption particle outlet 6. These contain NOx, SOx, etc., and it is problematic to release them directly into the atmosphere. Therefore, it is preferable to install exhaust gas abatement equipment at the outlet 6.

[0043] (adsorbed particles) The adsorption particles are preferably inorganic particles. Since the adsorption particles are repeatedly heated to 300 to 400°C and regenerated, they must have sufficient thermal stability to avoid deterioration when used repeatedly at this temperature. The high-temperature stability of the adsorption particles is preferably 600 to 1000°C, and more preferably 800 to 1000°C. In addition, when the particles are transported by the screw feeder, they collide with each other, with the blades of the screw feeder, and with the pipe wall, so the particles must have sufficient mechanical stability to avoid damage under these conditions. The compressive strength of the particles is 500 to 1500 kg / cm. 2 It is preferable that the resistance is 700 to 1200 kg / cm 2 It is more preferable that:

[0044] Considering a pre-processing step for adsorbent regeneration, such as a process of adsorbing and removing adhering materials from waste plastic flakes onto adsorbent particles, the average particle diameter of the adsorbent particles is preferably 10 to 100 μm, and more preferably 10 to 50 μm. Given that adsorption of organic substances occurs primarily on the surface of the adsorbent particles, a smaller particle diameter is preferred. This is because the adsorption amount per unit weight or unit volume increases with smaller particle diameters. However, if the average particle diameter is smaller than 10 μm, the adsorbent particles that have adsorbed organic substances are more likely to aggregate, making them difficult to handle and hindering the regeneration process. Furthermore, if the average particle diameter is larger than 100 μm, the adsorption amount per unit weight or unit volume decreases and transportation by a screw feeder becomes difficult. The average particle diameter can be measured in accordance with JIS Z 8825:2013.

[0045] As the adsorption particles, silica sand, diatomaceous earth, zeolite, activated carbon, perlite, silica gel, etc. are preferably used.

[0046] (Regeneration of adsorbent particles) Silica sand was used as the adsorption particles to adsorb organic matter from food waste. The organic matter-adsorbed silica sand was then heated at 300°C for 5 minutes. The regeneration rate was measured by measuring the weight of the adsorption particles, and it was found that 95% of the adsorbed matter had been removed, resulting in a regeneration rate of 95%. In actual operation, it was shown that when the heating section was maintained at 300°C, it was effective to retain the adsorbent particles for 5 minutes or more.

[0047] The present invention is not limited to the above-described contents, and various modifications and changes are possible within the scope of the gist of the invention. For example, the inner tube screw 15 of the inner tube screw feeder 17 may be left-handed. In this case, when viewed from the inlet 5 side toward the heating section A along the axis of the screw feeder, the inner tube screw feeder 17 rotates right, thereby transporting the introduced adsorption particles to the heating section A. Furthermore, in this case, from the viewpoint of heat exchange between the outer tube and the inner tube, it is preferable that the outer tube screw feeder 18 rotates left-handed when viewed from the inlet 5 side toward the heating section A along the axis of the screw feeder. This is because heat exchange between the adsorption particles in the outer tube and the adsorption particles in the inner tube is efficiently carried out. Therefore, it is preferable that the screw of the outer tube screw feeder 18 from the discharge port 6 of the outer tube screw 9 to the boundary between the feeding section B and the heating section A is left-handed. Even with this configuration, the effects of the present invention can be achieved. [Industrial Applicability]

[0048] The present invention can be used as a heating and regenerating device for adsorbent particles that have adsorbed organic matter such as food residue and oil. [Explanation of symbols]

[0049] 1...adsorbent particle regeneration device, 2...inner tube, 3...outer tube, 4...lagging, 5...feed port, 6...discharge port, 7...rotation mechanism, 8...rotation mechanism, 9...outer tube screw, 10...flat blade, 11...transfer port, 12...capillary tube heater, 13...gland packing, 14...shaft, 15...inner tube screw, 16...metal bushing, 17...inner tube screw feeder, 18...outer tube screw feeder, A...heating section, B...feed section, C...feed section

Claims

1. An adsorbent particle regeneration device having a screw feeder with a double-pipe structure, the screw feeder is provided with an inlet through which the adsorption particles are introduced into the inner tube of the double-layered structure of the screw feeder, and an outlet through which the adsorption particles are discharged from the outer tube of the double-layered structure of the screw feeder, the screw feeder has an inner tube screw feeder provided in an inner tube and an outer tube screw feeder provided in an outer tube, the adsorbent particle regeneration device has a heating section that heats the screw feeder from the outside, and a feeding section in which the adsorbent particles after heating and the adsorbent particles before heating exchange heat, The adsorption particles introduced into the inner pipe are transferred to the heating section by the inner pipe screw feeder, then transferred into the outer pipe through a transfer port provided in the inner pipe wall in the heating section, and further transferred from the heating section to the feeding section by the outer pipe screw feeder, where they exchange heat with the adsorption particles in the inner pipe and are then discharged from the discharge port. Adsorbed particle regeneration device.

2. An adsorbent particle regeneration device having a screw feeder with a double-pipe structure, the screw feeder is provided with an inlet through which the adsorption particles are introduced into the inner tube of the double-layered structure of the screw feeder, and an outlet through which the adsorption particles are discharged from the outer tube of the double-layered structure of the screw feeder, the screw feeder has an inner tube screw feeder provided in an inner tube and an outer tube screw feeder provided in an outer tube, the adsorbent particle regeneration device has a heating section that heats the screw feeder from the outside, and a feeding section in which the adsorbent particles after heating and the adsorbent particles before heating exchange heat, The adsorption particles introduced into the inner pipe are transferred to the heating section by the inner pipe screw feeder, then transferred into the outer pipe through a transfer port provided in the inner pipe wall in the heating section, and further transferred from the heating section to the feeding section by the outer pipe screw feeder, where they exchange heat with the adsorption particles in the inner pipe and are then discharged from the discharge port, The inner tube screw feeder provided in the inner tube and the outer tube screw feeder provided in the outer tube rotate in opposite directions. Adsorbed particle regeneration device.

3. 3. The apparatus for regenerating adsorbed particles according to claim 1, wherein the blades of the outer tube screw feeder located in the heating section are flat blades.

4. The outer tube screw feeder has a flat blade and an outer tube screw, 3. The adsorbed particle regeneration device according to claim 1, wherein the outer tube screw has a different winding direction on each side of the outlet.

5. 3. The adsorbent particle regeneration device according to claim 1, wherein the adsorbent particles are inorganic particles.

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