Oxidation treatment equipment

Abstract

The present invention provides an oxidation treatment apparatus that can perform oxidation reactions evenly and continuously under low temperature and low oxygen conditions. [Solution] The oxidation treatment apparatus 1 comprises a reactor 7 having material input ports 2a, 2b and an air inlet 3, wherein material to be processed is introduced from the material input ports and brought into contact with air introduced from the air inlet 3 to carry out the oxidation reaction, thereby enabling isolation from the outside air; a regulator 9 capable of limiting the amount of air flowing into the reactor 7 from the air inlet 3; a thermometer 11 for monitoring the temperature inside the furnace; an exhaust induction mechanism 15 that takes in outside air into an exhaust gas flow path 53 connected to the exhaust gas outlet 23 of the reactor 7 and combines it with the exhaust gas produced by the oxidation reaction of the material to be processed to assist in discharge; and a wet soot removal means 17 through which the exhaust gas discharged by the exhaust induction mechanism 15 passes.

Description

Technical Field

[0001] The present invention relates to an apparatus that mainly promotes the oxidation of organic waste in a low-temperature and low-oxygen state.

Background Art

[0002] Conventionally, batch-type small incinerators that have been popular among local governments, schools, companies, and individual households often lack proper temperature control. It has become widely recognized that combustion gases and soot released into the atmosphere during combustion at a relatively low temperature in the range of 300°C to 500°C contain dioxins and NOx. In response to this, the "Special Measures Law on Dioxin Countermeasures" was enacted in 1999, and in 2002, the "Regulations for the Enforcement of the Law on the Treatment and Cleaning of Waste" were partially revised and gradually implemented. As a result, it has become fundamental to respond by constructing large-scale waste treatment facilities (fully continuous furnaces) and concentrating waste there. The use and removal of small incinerators have been progressing, and now only small incinerators that meet the structural standards are permitted.

[0003] Small incinerators that meet the structural standards require an auxiliary combustion device using kerosene for combustion at 800°C or higher according to the above ordinance. However, it has long been recognized that even when combustion occurs at a high temperature of 800°C or higher, resynthesis of dioxin occurs when passing through the temperature range of 300°C to 500°C during the cooling process. Even if the structural standards are met, the dioxin problem has not been fundamentally solved.

[0004] On remote islands where large-scale waste treatment facilities (fully continuous furnaces) cannot be constructed and waste concentration is also difficult, batch-type small incinerators are still the mainstream. However, due to their low processing capacity, the need for transportation costs for waste that cannot be processed on the island to be transported outside the island, and the increase in floating waste, the waste treatment problem has become more serious. Not only on remote islands, but also for operators who have to pay high costs for waste treatment, such as convenience stores, hospitals, farmers who handle waste plastic materials generated in the agricultural, forestry, and fishery industries, and domestic industrial waste intermediate treatment operators, the need for in-house treatment devices that can reduce the volume of waste is increasing.

[0005] Recently, the concept of low-temperature pyrolysis has attracted attention as a promising alternative waste treatment technology to small-scale incinerators, and various devices claiming to achieve this have been proposed (Patent Documents 1, 2, and 3). Some of these devices have been introduced to local governments, and demonstration experiments for the treatment of organic waste are being conducted (Non-Patent Documents 1 and 2). Low-temperature pyrolysis devices are generally positioned as devices that decompose organic matter while avoiding combustion reactions by maintaining a low-oxygen state inside the furnace compared to the outside, at a temperature range lower than the dioxin production temperature range (300°C to 500°C). [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2008-55381 [Patent Document 2] Patent No. 6821164 [Patent Document 3] Patent No. 7525105 [Non-patent literature]

[0007] [Non-Patent Document 1] Komae City website, "Demonstration Experiment of Upcycling Scheme for Organic Waste Materials," May 2024 (URL: https: / / www.city.komae.tokyo.jp / index.cfm / 46,132125,c,html / 132125 / 2-yukikei.pdf) [Non-Patent Document 2] Yomiuri Shimbun, July 7, 2024, Tokyo Edition, Morning Edition, page 26, "Low-temperature decomposition of waste → turns it into lime: Komae City, the first municipality to do so, begins trial introduction of equipment." [Overview of the project] [Problems that the invention aims to solve]

[0008] During field testing of conventional low-temperature pyrolysis apparatuses, the inventors encountered problems such as the need to ignite a pilot light because low-temperature pyrolysis did not proceed sufficiently, and in the worst-case scenario, the fire would extinguish while unburned material remained. In investigating the cause of this problem, they realized that a common issue in low-temperature pyrolysis apparatuses was that the thermal decomposition of moisture-containing material in the furnace generated steam that stored heat, and because this steam was not adequately discharged from the furnace, it remained inside the furnace, cooled, condensed, and dripped down. It is thought that this water dripping down the inside of the apparatus comes into contact with the material and ash, which were waiting for the pyrolysis reaction, and could hinder low-temperature pyrolysis.

[0009] The pyrolysis furnace described in Patent Document 1 is equipped with ball valves 17 in the air supply pipes 4 and 5, which can limit the amount of air flowing in, and also has a fan 24 that exhausts exhaust gas into the atmosphere. However, since the fan 24 is installed at the end of the flue, it has little ability to expel and dissipate the water vapor gas that is constantly generated in the furnace when pyrolysis processing organic waste. It is considered that this makes it impossible to avoid the condensation of water vapor in the furnace and its subsequent fall onto the ash bed, which negatively affects the stabilization of low-temperature pyrolysis.

[0010] Patent Document 2 describes a cryo-decomposition apparatus in which a control valve 24 is placed at the outside air intake 21, and the amount of air taken in is limited by adjusting the opening of the intake 21. On the exhaust side, it is described that water vapor is contained in the exhaust gas after it has been neutralized by a scrubber 50 trapping particles contained in the exhaust gas with mist, suggesting that a large amount of water vapor is generated inside the furnace, yet there is no mention of or countermeasures for the problem of condensation inside the furnace.

[0011] The pyrolysis apparatus described in Patent Document 3, based on the definition of "pyrolysis" described in paragraph 0006, is interpreted as performing "pyrolysis," which involves heating and decomposing organic matter in the absence of oxygen, and differs from the concept of utilizing an "oxidation" reaction in a low-oxygen state. Furthermore, since the amount of air introduced is not restricted at the air inlet, oxygen from the air is taken directly into the apparatus, and excess oxygen is discharged from the oxygen outlet. In addition, there is no means to forcibly discharge the exhaust gas before the exhaust gas filtration unit 19, so there is no mention or countermeasures for the problem of water vapor gas condensation inside the furnace.

[0012] In view of the above situation, the present invention aims to provide an oxidation treatment apparatus that can carry out oxidation reactions evenly and continuously under low temperature and low oxygen conditions. [Means for solving the problem]

[0013] One aspect of the present invention made to achieve the above objective is an oxidation treatment apparatus comprising: a reactor having an air inlet and an exhaust gas outlet and capable of being isolated from the outside air; a regulator capable of limiting the amount of air flowing into the reactor from the air inlet; a thermometer for monitoring the temperature inside the furnace; an exhaust induction mechanism that assists in discharge by taking in outside air into an exhaust gas flow path connected to the exhaust gas outlet of the reactor and combining it with the exhaust gas produced by the oxidation reaction of the material to be treated; and a wet soot removal means for passing the exhaust gas discharged by the exhaust induction mechanism. With such a device, the thermometer reading is monitored as an indicator of the progress of the oxidation reaction, and the amount of air inflow is limited by a regulator to maintain a low-oxygen state inside the furnace compared to the outside, thereby allowing the oxidation reaction to proceed gently and avoiding a rapid temperature rise. At the same time, by providing an exhaust gas discharge induction mechanism containing water vapor before the wet soot removal means, the increase in carbon dioxide concentration inside the furnace and the temperature drop caused by condensation falling onto the ash bed where the treated material and other materials are mixed, and ultimately the extinguishing of the fire, are suppressed. Overall, a sustained oxidation reaction is evenly achieved in a relatively low-temperature, low-oxygen state, suppressing the emission of harmful substances while promoting waste volume reduction.

[0014] In the above-mentioned oxidation treatment apparatus, it is preferable that the wet soot removal means is a tank that stores water or an alkaline solution and into which exhaust gas can be introduced, or that the wet soot removal means is a spray capable of spraying water or an alkaline solution. With such a configuration, water vapor and fine particles in the exhaust gas can be efficiently collected, and trace amounts of acidic gases such as hydrogen chloride (HCl) and sulfur oxides (SOx) can be captured in water or an alkaline solution or neutralized.

[0015] Preferably, the above oxidation treatment apparatus is further equipped with an ozone generator for ozone treatment of the gas discharged from the wet soot removal means. With such a configuration, water-insoluble volatile organic pollutants (VOCs) that are not attached to the soot are decomposed and removed, enabling cleaner exhaust gas discharge to the environment and recycling.

[0016] The above-described oxidation apparatus preferably has a reactor with a throttling section and a material accumulation section arranged vertically from top to bottom, with the throttling section having an inclined surface such that its volume decreases as it approaches the material accumulation section, and the air inlet of the reactor being covered from above by a hood, wherein the hood has a curved or pointed shape that is convex upward in a cross-sectional view perpendicular to a plane that includes the vertical line and is perpendicular to both the inclined surface and the horizontal plane. With such a configuration, when the material to be processed falls, it will not block the air inlet and obstruct the supply of air or hinder low-temperature oxidation. Furthermore, compared to a hood with a canopy structure that appears straight in the cross-sectional view, the material is more easily slid from the top of the hood to both sides, allowing as much of the material to be processed as possible to accumulate in a compressed state near the bottom surface of the throttling section and come into contact with the air. Additionally, because the slope is gentle, the residence time of the material above the hood is increased, the oxidation reaction becomes locally active near the top of the hood, and the oxidation decomposition is promoted evenly and completely.

[0017] The above oxidation treatment apparatus is preferably equipped with a screw conveyor in the material accumulation section. With such a configuration, it is possible to prevent large amounts of ash from being scattered during manual ash removal work, thereby saving time and effort.

[0018] Preferably, the oxidation treatment apparatus further includes a controller that adjusts a regulator based on the temperature inside the furnace. With such a configuration, semi-automation or full automation of low-temperature and low-oxygen oxidation becomes possible.

[0019] Another aspect of the present invention made to achieve the above object is to cause an oxidation reaction to proceed to obtain an oxidized product by bringing a workpiece into contact with oxygen in a space where the composition ratio of oxygen (O2) is kept lower than that of the outside air, to adjust the amount of oxygen flowing into the space based on the temperature inside the space, to discharge and guide exhaust gas containing water vapor generated by the oxidation reaction outside the space, and to wet-remove soot in the exhaust gas that has been discharged and guided. According to such a manufacturing method, by restricting the amount of oxygen flowing in and maintaining a low-oxygen state inside the space compared to outside the space, the oxidation reaction proceeds gently while avoiding a rapid temperature rise due to reaction heat, and by discharging and guiding the exhaust gas containing water vapor, an increase in the carbon dioxide concentration inside the space, a temperature drop caused by dew condensation falling on the ash bed where the workpiece and the treated product are mixed, and thus the occurrence of fire suppression are suppressed, and a continuous oxidation reaction in a relatively low-temperature and low-oxygen state can be uniformly realized as a whole.

Advantages of the Invention

[0020] According to the oxidation treatment apparatus of the present invention, an oxidation reaction in a low-temperature and low-oxygen state can be continuously and uniformly carried out.

Brief Description of the Drawings

[0021] [Figure 1] Photograph of the overall configuration of the oxidation treatment apparatus. [Figure 2a] (a) CC cross-sectional view showing the overall configuration of the oxidation treatment apparatus. [Figure 2b] (b) AA cross-sectional view of the main body in Fig. 2a, (c) BB cross-sectional view of (b), (d) DD cross-sectional view of the main body in Fig. 2a. [Figure 3] Photograph of the state where the external piping and sealing lid of the discharge guiding mechanism are removed from the cylindrical member. [Figure 4]A photograph showing the inside of the cylindrical member viewed from the second opening side. [Modes for carrying out the invention]

[0022] The following definitions of terms used in this specification are provided below. In this specification, "material to be treated" refers to waste (including commercial waste) that has been recognized as combustible (burnable) waste according to the classification of the municipality where the oxidation treatment apparatus of the present invention is installed. Such waste is not particularly limited, but examples include organic waste such as food waste, plant residue, waste plastic bags, plastic and mulch from agricultural greenhouses, diapers contaminated with feces, and fishing nets. In this specification, "oxidation reaction" refers to the reaction between the material being treated and oxygen in the air. "Oxidation reactions" include both oxidation reactions without light and oxidation reactions with light. The latter is called a "combustion reaction," and therefore, combustion reactions are a subcategory of oxidation reactions. In this specification, "isolation from the outside air is possible" means that by carrying out the oxidation treatment of the material to be treated, it is possible to create an environment in which the composition ratio of oxygen and / or carbon dioxide is different from that of the outside air. In this specification, "processed material" means a material that has undergone some or all oxidation and / or drying within the apparatus. In this specification, "clean exhaust gas" means that the exhaust gas is substantially free of soot particles generated by the oxidation reaction of the treated material and has a dioxin concentration below the standard value (2.5 pg-TEQ / m³). 3 This means lower exhaust emissions than ).

[0023] The oxidation treatment apparatus 1 shown in Figures 1 and 2 comprises a housing 5 that can be isolated from the outside air by closing the material input port 2a, a reactor 7 housed in the housing 5 and having a material input port 2b and an air inlet 3, a regulator 9 that can limit the opening of an air introduction passage 6 connected to the air inlet 3 inside the reactor 7, a thermometer 11 for monitoring the temperature inside the furnace, an exhaust gas discharge induction mechanism 15 for exhaust gas generated by the oxidation reaction inside the reactor 7, a wet soot removal means 17 that brings the exhaust gas discharged by the discharge induction mechanism 15 into contact with water or an alkaline solution 72, and an ozone generator 19 for ozone treatment of the gas discharged from the wet soot removal means 17.

[0024] The housing 5 is generally rectangular in shape and is supported by four pillars 30. The top surface has an outer cover 21 with an angled handle to limit the range of motion at the material input port 2a. An exhaust gas outlet 23 is located on the upper part of the first side surface 22, a bearing hole 25 is located on the lower part of the first side surface 22, and a screw receiving opening 27 is located on the second side surface 24 opposite the first side surface 22 at a position corresponding to the bearing hole 25. Five air intake pipe receiving holes 29 are provided at equal intervals on each side surface, at a position higher than the bearing hole 25, on the third side surface 26 and the fourth side surface 28.

[0025] The internal space 4 of the reactor 7 is divided into three sections from top to bottom in the vertical direction: a material accumulation section 4a, a throttling section 4b, and a material storage section 4c. The material to be processed accumulation section 4a is generally rectangular in shape, and the material to be processed input opening 2b on the top surface is provided with an inner lid 31 having straight tooth grooves 32 engraved on its side. The tooth grooves 32 of the inner lid 31 mesh with the worm wheel 33, the worm wheel 33 meshes with a worm 36 formed on the surface of the support rod 35, and the support rod 35 is inserted into the center of the handle 37. The constricted section 4b has open upper and lower surfaces that connect to the lower surface of the material to be processed accumulation section 4a and the upper surface of the material accumulation section 4c, and has an inclined surface 43 that appears as an inverted trapezoid when viewed from the side facing the first side surface 22 of the housing 5 toward the material accumulation section 4c. A through hole 38 is made in the inclined surface 43 at a position slightly lower than the air intake pipe receiving hole 29 and higher than the bearing hole 25. The material accumulation section 4c has an upper surface that connects to the lower surface of the constricted section 4b, a drive shaft receiving hole 39 on the side facing the first side surface 22 of the housing 5, and a square-shaped opening on the side facing the second side surface 24, with its lower surface forming the bottom surface 40 of the reactor 7. A hood 46 is attached to the inner wall side of the inclined surface 43 of the reactor 7, starting slightly above the through hole 38. When viewed from a cross section parallel to the first side surface 22 of the housing 5, the hood 46 has a slope δ smaller than the slope θ of the inclined surface 43 with respect to the horizontal plane, and protrudes from the tip of the air inlet pipe 18 (described later) to near the center of the reactor 7. The hood 46 is also an isosceles triangle in a cross-sectional view parallel to the third side surface 26, that is, a cross-sectional view perpendicular to a plane that includes a vertical line and is perpendicular to both the inclined surface 43 and the bottom surface 40 (horizontal plane). Here, the cross-sectional shape of the hood is not limited to an isosceles triangle, as long as it has a shape that is easy to slide on both sides from the top end, that is, an upwardly convex curved shape or a pointed shape, and the area near the bottom end may change to a downward convex shape. The drive shaft 13 of the screw conveyor 12 is inserted through and spans from the bearing hole 25 of the housing 5 to the processed material accumulation section 4c of the reactor 7, the screw receiving opening 27 of the housing 5, and near the opening end of the ash removal section 20. The screw blades 14, which are helically attached around the drive shaft 13, extend from near the inner wall surface of the first side surface 22 of the reactor 7 to the outside of the screw receiving opening 27 provided on the second side surface 24 of the housing 5. The opening end of the ash removal section 20 is closed with a lid 34.

[0026] The air inlet pipe 18 is inserted through the air inlet pipe receiving holes 29 on the third side surface 26 and the fourth side surface 28 of the housing 5, respectively, and then bends diagonally downward so as to pass through the through hole 38 on the inclined surface 43 of the reactor 7, with its tip pointing slightly lower than the through hole 38 on the opposite inclined surface 43. The air intake pipe 18 is equipped with a regulator 9 that can limit the opening of the air inlet 3 or the air intake passage 6 connected to the air inlet 3.

[0027] In this embodiment, a thermistor thermometer 11 is inserted inside the housing 5 and connected to a temperature display 48 located on the outside of the housing 5, making it possible to monitor the temperature. The term "furnace temperature" can refer to the temperature at a single location or at multiple locations. When it refers to the temperature at a single location, it is usually measured at the location in the reaction furnace 7 where the highest temperature is reached, near the throttling section 4b where the material to be processed and the processed material are mixed. When it refers to the temperature at multiple locations, in this embodiment, the temperature near the throttling section 4b and the temperature near the exhaust gas outlet 23 of the oxidation treatment apparatus 1 are measured. In this specification, the furnace temperature is the temperature measured by a thermistor. Normally, the furnace temperature is adjusted so that the temperature near the throttling section 4b is 250°C or less, and the temperature near the exhaust gas outlet 23 of the oxidation treatment device 1 is 150°C or less.

[0028] The exhaust induction mechanism 15 is connected to the exhaust gas outlet 23 of the housing 5 via a flexible pipe 52. As shown in Figures 2a, 2b, 3, and 4, in the exhaust induction mechanism 15, the main body side piping 53 is connected to the flexible piping 52 with a flange joint 56 on the exhaust gas inlet 54 side, and is inserted and welded to a first opening 58 having an opening diameter smaller than the inner diameter of the cylindrical member 57 on the exhaust gas outlet 55 side, and is further butt-welded to an inner piping 61 having the same diameter as the first opening 58. The cylindrical member 57 has an air supply introduction passage 60 that penetrates its peripheral wall 59, and the direction of air supply introduction into the cylinder is set circumferentially so that the air swirls inside the cylinder. An air guide plate 69 is placed inside the cylinder at the position where the air collides. The air supply introduction passage 60 of the cylindrical member 57 is connected to the air outlet of the blower 70. The inner piping 61 has two incision holes 63 for taking in air, located within the space between the inner circumferential surface 62 of the cylindrical member 57, the first opening 58, and the second opening 68 on the opposite side of the first opening 58, which has an opening diameter equal to the inner diameter of the cylindrical member 57. These incisions serve as air intake ports. The cylindrical member 57 has its second opening 68 closed with a sealing cover 64 having a hole the same diameter as the inner pipe 61, and is then connected to the outer pipe 65 with a flange joint 66. The external piping 65 is connected to the tank-side conduit 67.

[0029] The wet soot removal means 17 consists of a tank 71 into which exhaust gas can be introduced via a water tank-side conduit 67 of the discharge induction mechanism 15, an alkaline solution 72 stored in the tank 71, a honeycomb-shaped ceramic filter 73 provided at the upper opening of the tank 71, and a motor-driven water turbine 76 installed near the ceramic filter 73 at a height that allows the alkaline solution 72 to be pumped out. The exhaust duct 74 and exhaust pipe 75 are connected to the upper opening of the tank 71, and ozone generated by the ozone generator 19 is supplied into the exhaust duct 74. In this embodiment, the alkaline solution 72 is an aqueous solution containing two or more surfactants and alkali metal hydroxides.

[0030] The effects and benefits based on the above configuration are explained below. First, confirm that the outer cover 21 of the housing 5 and the cover 34 of the ash removal section 20 are closed, and that the valve of the regulator 9 is closed. Then, turn the handle 37 in the forward direction to drive the interconnected worm 36, worm wheel 33, and teeth 32, thereby keeping the inner cover 31 of the reactor 7 open. This combination of worm gear structure and rack and pinion structure allows even a woman to slide the heavy inner cover 31 horizontally with minimal rotational force from the handle 37. Next, the outer cover 21 provided at the material input port 2a of the housing 5 is slightly opened and the material to be processed is introduced. After introduction, the outer cover 21 immediately closes due to its weight. This double-door opening and closing system minimizes the inflow of air into the reactor 7, suppresses the backdraft phenomenon, and allows for the safe introduction of the material to be processed. It also serves as a countermeasure against condensation caused by the reactor 7 being exposed to outside air (cold air). Next, the handle 37 is turned in the opposite direction to tighten the inner cover 31 and open the valve of the regulator 9, which slowly opens the air intake passage 6 and introduces air through the air inlet 3. This initiates the oxidation reaction and creates an environment isolated from the outside air. In the material deposition section 4a of the reactor 7, generally, the material is mostly compressed and unoxidized, with the amount of material deposited decreasing towards the bottom. However, the heat generated by the oxidation reaction in the lower constricted section 4b may be transferred, causing drying and / or oxidation reactions to begin. In the constricted section 4b, all or part of the material to be processed begins to dry due to oxidation and / or reaction heat, and the volume of the material to be processed also decreases near the boundary with the material to be processed accumulation section 4a. As a result, the material to be processed and the processed material, which have decreased in volume along the inclined surface 43 of the constricted section 4b, gradually descend along the inclined surface 43 and accumulate on the hood 46, which has a slope δ smaller than the slope θ of the inclined surface 43 with respect to the horizontal plane when viewed from a cross section parallel to the first side surface 22 of the housing 5. Here, the material to be processed and the processed material sandwiched between the left and right hoods 46 are concentratedly exposed to the air supplied from the air inlet 3, and the oxidation reaction becomes most active, promoting conversion into processed material. The temperature in this area is observed by the temperature indicator 48 on the outside of the housing 5 via the thermometer 11, and the opening and closing of the valve of the regulator 9 is adjusted so that the temperature is kept below 250°C, closing it when it gets too high and opening it when it gets too low. The final ash-like material containing potassium carbonate falls by gravity from the tip of the hood 46 into the material accumulation section 4c, where it mixes with the air supplied from the air inlet 3 and becomes a heat source for the oxidation reaction above. In the treated material accumulation section 4c, the treated material that has completed the oxidation reaction accumulates. Normally, there is virtually no unoxidized treated material in the treated material accumulation section 4c, but if the objective of volume reduction or other purposes has been achieved, some may remain to an acceptable extent depending on the purpose. Simultaneously, in the reactor 7 centered on the throttling section 4b, the drying and / or oxidation reaction of the material being processed generates water vapor, carbon dioxide, and acidic gases such as hydrogen chloride (HCl) and sulfur oxides (SOx). These form an upward airflow, accompanied by fine soot particles, which pass over the top of the material being processed accumulation section 4a of the reactor 7 as exhaust gas and are gradually pushed out from the exhaust gas outlet 23 of the housing 5. These exhaust gases then pass through the flexible piping 52 and the main body side piping 53 of the discharge guidance mechanism 15, reaching the inner piping 61. Meanwhile, once it is confirmed that the oxidation reaction is progressing inside the housing 5, the blower 70 connected to the power source takes in outside air and sends airflow into the air supply introduction passage 60 of the cylindrical member 57, generating a swirling flow inside the cylinder. A portion of this airflow is drawn into the inner piping 61 through the cut hole 63, entraining the exhaust gas and providing a force that pushes it out in the discharge direction within the inner piping 61. The exhaust gas containing water vapor and soot sent into the water tank 71 passes through a honeycomb-shaped ceramic filter 73. At this time, water droplets are scattered all over the ceramic filter 73 by a motor-driven water turbine 76 and adhere to it. These water droplets and soot mix and drip back into the water tank 71, removing the soot, and the clean exhaust gas is released into the atmosphere through the exhaust duct 74 and exhaust pipe 75.

[0031] The method for producing an oxidized product and clean exhaust gas according to the present invention includes a step (S1) of bringing the product to be treated into contact with oxygen in a space in which the oxygen (O2) composition ratio is kept lower than that of the outside air, thereby allowing the oxidation reaction to proceed. Keeping the oxygen (O2) composition ratio lower than that of the outside air is achieved by intermittently or continuously supplying outside air (air) or oxygen into a space in which the inflow of air is restricted to promote the oxidation reaction and consume oxygen. While the oxygen composition of ambient air is typically 20.9% and the carbon dioxide composition is 0.04%, the composition required for the oxidation reaction in the space during the production of the oxidized product according to the present invention requires that the oxygen content be kept lower than that of ambient air, approximately 18.1% (preferably 15% to 20%, more preferably 17.5% to 18.5%), and approximately 2.09% (preferably 5% or less) for carbon dioxide, even if it increases slightly due to the oxidation reaction. In any case, it is necessary that the oxygen content be higher and the carbon dioxide content lower than the ratio during fire extinguishing. In this specification, the oxygen composition ratio is a value measured using a zirconia oxygen sensor near the workpiece where the oxidation reaction is occurring, but without contact with the workpiece. In this specification, the carbon dioxide composition ratio is a value measured using an NDIR sensor near the workpiece where the oxidation reaction is occurring, without contact with the workpiece.

[0032] Step (S1) may include a substep (S1-1) in which a pilot light is added to promote oxidation. The pilot light can be a lit piece of burning wood or easily ignitable cedar leaves. While the timing of adding the pilot light is arbitrary, it is preferable to add a sufficient amount of pilot light before adding the material to be treated and maintain a stable level of it. Step (S1) may include a substep (S1-2) in which the workpiece is heated from the outside or inside using an electric heater to promote oxidation. Heating can be performed using an electric heating wire.

[0033] The process includes a step (S2) of adjusting the amount of oxygen flowing into the space based on the temperature inside the space. In step (S1), the oxidation reaction consumes oxygen and increases carbon dioxide, and the heat of the reaction raises the temperature in the space. To suppress the rise in temperature in the space and suppress the decrease in the oxygen composition ratio, the inflow of air or oxygen into the space is regulated intermittently or continuously. The temperature within the space is usually adjusted so that the temperature near the material being treated, where the oxidation reaction is most active, is generally below 250°C. While the term "generally" indicates that temporary temperatures exceeding 250°C are acceptable, it is desirable to maintain a temperature range of approximately 150°C to 250°C, as this is the temperature range in which dioxins are formed. The temperature inside the space was measured using a thermistor thermometer 11.

[0034] The process includes step (S3) of inducing the discharge of exhaust gas containing water vapor generated by the oxidation reaction. For guiding the discharge of exhaust gases, the above-mentioned method of using a blower to take in outside air and assisting the discharge of exhaust gases with its swirling force can be employed, or a suction method (for example, called an ejector or aspirator) can be used, in which a nozzle is inserted into the exhaust gas pipe from the peripheral wall of the exhaust gas pipe and extends toward the direction of discharge, and the taken-in outside air is flowed into the nozzle at high speed to draw in the exhaust gas toward the direction of discharge.

[0035] The process includes a step (S4) of wet-removing soot from the exhaust gas that has been induced to be emitted. The wet removal method is not particularly limited and can be employed in various ways, such as spraying water or an alkaline solution into the exhaust gas flow path and allowing it to adhere to droplets before falling, bubbling water or an alkaline solution into a tank containing water or an alkaline solution, or installing a ceramic filter 73 on the exhaust gas flow path, attaching it to the filter, and then spraying water or an alkaline solution to allow it to drip down as droplets. Dioxins adhering to oxidized materials, and dioxins adhering to soot particles in exhaust gas in liquid or solid form, are oxidized and decomposed at temperatures lower than the dioxin production temperature range (300°C to 500°C) and within the furnace compared to the outside, thus avoiding combustion reactions and resulting in dioxin concentrations lower than the standard values. The temperature of clean exhaust gas is typically around 30°C to 35°C.

[0036] It should be noted that the embodiments of the present invention are not limited in any way to the embodiments described above, and not all of the configurations described in the embodiments above are necessarily essential requirements of the present invention. The present invention can take various forms of modification, etc., as long as it does not depart from the technical idea and falls within the technical scope. For example, a cyclone is used as the discharge induction mechanism 15, but an intake mechanism called an ejector or aspirator may be used instead. The drive source for the ejector or aspirator may be either a liquid or a gas. Also, the oxygen magnetization section may or may not be included. As the wet soot removal means 17, a water tank may be replaced by providing a spray capable of spraying water or an alkaline solution on the exhaust gas flow path. The air inlet pipe 18 may be equipped not only with a regulator 9, but also with an oxygen magnetization section in which two permanent magnets are arranged so that their opposite magnetic pole surfaces face each other across the air inlet passage 6. The outer piping 65 may be abolished, and the inner piping 61 may be directly connected to the water tank side conduit 67. [Industrial applicability]

[0037] The oxidation treatment apparatus according to the present invention does not require auxiliary fuel, suppresses harmful components that have adverse effects on both human health and the environment, and is a device that is friendly to both people and the environment. It can be used by domestic industrial waste intermediate treatment companies, local governments on remote islands that are having trouble disposing of waste, waste generated in agriculture, forestry and fisheries, and coastal areas that are having trouble disposing of marine debris, and therefore has great potential for industrial use. [Explanation of Symbols]

[0038] 1. Oxidation treatment apparatus 2a,2b Processing material inlet 3. Air intake 4 Interior space 4a Processing material accumulation section 4b Aperture section 4c Processing material accumulation section 5 cabinets 6. Air intake passage 7 Reactor 9 Regulator 11 Thermometer 12 Screw conveyor 13 Drive shaft 14 Screw Wing 15 Ejection guidance mechanism 17 Wet soot removal means 18 Air intake pipe 19. Ozone generator 20 Ash removal section 21 Outer lid 22 First aspect 23 Exhaust gas outlet 24 Second aspect 25 bearing holes 26 Third aspect 27 Screw receiving opening 28 Fourth aspect 29 Air intake pipe receiving hole 30 pillars 31 Inner lid 32 teeth 33 Worm Wheel 34. Lid (for the ash removal opening) 35 Support rod 36 Warm 37 Handle 38 Through holes 39 Drive shaft receiving hole 40 Bottom 43 Slope 46 Food 48 Temperature display 52 Flexible Piping 53 Piping on the main unit side 54 Exhaust gas inlet 55 Exhaust gas outlet 56, 66 Flange joints 57 Cylindrical member 58 First opening 59 Peripheral wall 60 Air supply introduction path 61 Internal piping 62 Inner surface 63 Incision hole 64 Sealing cover 65 Outside piping 67 Aquarium side conduit 68. Second opening 69 Guidance plate 70 blower 71 tank 72. Water or alkaline solution 73 Ceramic filter 74 Exhaust duct 75 Exhaust stack 76 Waterwheel

Claims

1. A reactor having an air inlet and an exhaust gas outlet, and capable of being isolated from the outside air, A regulator capable of limiting the amount of air flowing into the reactor from the air inlet, A thermometer to monitor the temperature inside the furnace, An exhaust induction mechanism assists in discharge by taking in outside air into the exhaust gas flow path connected to the exhaust gas outlet of the reactor and combining it with the exhaust gas produced by the oxidation reaction of the material being treated, An oxidation treatment apparatus comprising a wet soot removal means for passing exhaust gas induced by the said emission induction mechanism.

2. The reactor has, in order from the top in the vertical direction, a throttling section and a material accumulation section. The constricted section has an inclined surface such that the volume decreases as it approaches the material accumulation section. The air inlet of the reactor is covered from above by a hood. The oxidation apparatus according to claim 1, wherein the hood has a curved or pointed shape that is convex upward in a cross-sectional view perpendicular to a plane that includes a vertical line and is perpendicular to both the inclined surface and the horizontal plane.

3. The oxidation treatment apparatus according to claim 1, wherein the wet soot removal means is a tank capable of storing water or an alkaline solution and introducing exhaust gas.

4. The oxidation treatment apparatus according to claim 1, wherein the wet soot removal means is a spray capable of spraying water or an alkaline solution.

5. Furthermore, the oxidation treatment apparatus according to claim 1, further comprising an ozone generator for ozone treatment of the gas discharged from the wet soot removal means.

6. The oxidation treatment apparatus according to claim 2, further comprising a screw conveyor in the material accumulation section.

7. Furthermore, the oxidation treatment apparatus according to claim 1 is further equipped with a controller that adjusts the regulator based on the furnace temperature.

8. Oxygen (O ２ The process involves bringing the material to be treated into contact with oxygen in a space where the composition ratio of the material is kept lower than that of the outside air, thereby allowing the oxidation reaction to proceed and obtaining an oxidized product. The amount of oxygen flowing into the space is adjusted based on the temperature within the space, To guide the exhaust gas containing water vapor generated by the oxidation reaction to be discharged outside the space, A method for producing an oxidized product and clean exhaust gas, comprising wet removal of soot from exhaust gases that have been induced to be emitted.

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