Cooling device

Abstract

To provide a reliable cooling device that can rapidly and uniformly cool high-temperature charred materials and effectively suppress the risk of spontaneous combustion. [Solution] The cooling device 100 has a housing 10 and a screw 20 located inside it. The screw shaft 21 has a hollow section 21a, and a plurality of nozzles 24 and 25 that communicate with the hollow section are opened on the outer surface of the shaft. In the process of conveying material from the supply port 10c to the discharge port 10d, saturated steam injected into the hollow section of the shaft is ejected directly from the nozzles toward the conveyed material, uniformly cooling the conveyed material from the center.

Description

Technical Field

[0001] The present invention relates to a cooling device.

Background Art

[0002] Conventionally, as shown in Patent Document 1, there is a cooling device disposed at the subsequent stage of a carbide manufacturing device that carbonizes organic waste such as wood chips, for cooling the carbide. The cooling device shown in this Patent Document 1 is of a screw conveyor type, and is configured to indirectly cool the carbide conveyed inside by flowing a heat medium such as cooling water through a jacket provided on the outer periphery of the casing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the indirect cooling of the jacket type as described in Patent Document 1, there is a limit to the heat conduction efficiency, and particularly in the case of a substance having heat insulation properties such as carbide, it may be difficult to sufficiently cool the central part of the screw conveyor. The carbide immediately after being discharged from the carbonization furnace is at a high temperature of about 250°C to 300°C, and if it comes into contact with the atmosphere while the cooling is insufficient, there is a serious risk of spontaneous ignition due to reaction with oxygen. Further, due to the characteristics of the carbide, the internal temperature may rise (adsorption heat) during cooling, and there was a concern that a simple indirect cooling could not cope with this risk.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide a highly reliable cooling device that can rapidly and uniformly cool high-temperature carbide and effectively suppress the risk of spontaneous ignition.

Means for Solving the Problems

[0006] The cooling device described in claim 1, made to achieve the above objective, The enclosure (10) and The housing includes a screw (20) that is rotatably disposed within the housing, The aforementioned screw is A shaft (21) having a hollow section (21a) formed inside, The blades (22, 23) protrude spirally from the outer surface of the shaft, It comprises a plurality of nozzles (24, 25) that communicate with the hollow portion and open to the outer surface of the shaft, The aforementioned housing has a supply port (10) into which the transported material is supplied. c )and, The system includes an outlet (10d) for discharging the conveyed material, The hollow portion of the shaft Saturation at approximately 100°C Steam is injected, The transported material is carbonized material discharged from the carbonization apparatus. As the screw rotates, the material is transported from the supply port to the discharge port. carbide In contrast, from the plurality of nozzles Saturation at approximately 100°C steam directly By being ejected, An atmosphere of saturated steam at approximately 100°C is formed inside the enclosure, and contact between the carbide and oxygen is blocked by the atmosphere of saturated steam at approximately 100°C, thereby suppressing the rise in internal temperature due to the heat of adsorption of the carbide. The aforementioned carbonization When the object is cooled This prevents spontaneous combustion. It is characterized by being configured in such a way.

[0007] According to this system, steam is supplied to the inside of the screw shaft, and the steam is ejected directly onto the conveyed material from a nozzle provided on the shaft. Furthermore, because the steam is ejected from a nozzle formed on the shaft, compared to a configuration in which steam is ejected into the housing, the conveyed material is cooled from the center, allowing for more even and uniform cooling. This makes it possible to efficiently cool high-temperature conveyed material from the inside. In particular, when the conveyed section is high-temperature carbonized material discharged from a carbonization device, it can be rapidly cooled to below the temperature at which it reacts with oxygen and ignites, thereby suppressing the risk of ignition during conveying or in subsequent processes. In addition, unlike cooling by simply adding water, it suppresses problems such as the rise in internal temperature due to the heat of adsorption of the conveyed material, making it possible to cool the conveyed material safely. Furthermore, by using saturated steam as a cooling medium, high-temperature materials can be cooled at a stable temperature of approximately 100°C. This makes it possible to rapidly cool the materials, especially high-temperature carbonized materials discharged from a carbonization plant, to below their ignition temperature (e.g., below 200°C). Moreover, compared to simply adding water, this method suppresses the risk of the internal temperature rising again due to the heat of adsorption of the materials, allowing for safer cooling of the carbonized materials.

[0010] Claim 2 The invention described in claim 1 is, The aforementioned feathers are, A conveying blade (22) that conveys the conveyed material from the supply port (10c) toward the discharge port (10d), It is characterized by comprising a reverse conveying blade (23) provided downstream of the discharge port (10d) in the conveying direction and formed in a spiral shape opposite to that of the conveying blade.

[0011] According to this design, even if the conveyed material does not fully discharge from the outlet and attempts to move towards the back of the enclosure, the reverse conveying blades forcibly push it back towards the outlet. This prevents leakage of conveyed material and prevents it from sticking and accumulating at the edges of the enclosure.

[0012] Claim 3 The invention described in claim 1 is, The plurality of nozzles are characterized by being arranged spirally along the direction in which the blades are formed.

[0013] According to this design, since the nozzles are arranged spirally along the direction of blade formation, when the screw rotates, the nozzles themselves that eject steam move in both the circumferential and axial directions. Therefore, the concentration of steam ejection at specific locations is suppressed, and steam can be brought into contact with the entire conveyed material being transported inside the enclosure in an extremely wide and uniform manner. Furthermore, the stirring and mixing action of the conveyed material by the conveying blades is linked to the steam ejection from the spiral nozzles. As a result, steam is immediately injected even to the high-temperature parts of the conveyed material that are newly exposed on the surface by the conveying blades, effectively suppressing uneven cooling from the center to the surface of the conveyed material and achieving extremely efficient heat exchange. In addition, since the steam ejection path is constantly changing with the rotation of the screw, the fixation of steam channels within the conveyed material layer is suppressed, making it possible to improve the penetration of steam into the entire conveyed material.

[0014] It is preferable that a second jet outlet is also provided in the region where the reverse conveying blade is provided.

[0015] According to this, it is also possible to inject steam into the conveyed material that is pushed back immediately before discharge, suppress uneven cooling, and physically suppress the adhesion of the conveyed material at the end of the housing by the force of the steam.

[0016] Claim 4 The invention according to claim is, in the invention according to claim 1, A rotary joint (40) is connected to one end of the shaft for rotatably supporting the shaft and introducing the steam supplied from the outside into the hollow portion.

[0017] According to this, since the rotary joint serves both as a function of a bearing for supporting the rotating shaft and as a joint for introducing steam, the number of parts can be reduced and the structure of the device can be simplified. In addition, steam can be stably supplied from the outside to the rotating shaft.

[0018] Claim 5 The invention according to claim is, in the invention according to claim 1, An exhaust port (10e) for discharging the internal gas is provided in the upper part (10b) of the housing.

[0019] According to this design, excess saturated steam used for cooling and gases (such as volatile components) generated from high-temperature conveyed materials can be properly discharged to the outside through an exhaust port located at the top of the enclosure. This prevents an abnormal rise in internal pressure, thus avoiding excessive physical stress on the enclosure body and sealing parts such as bearings and rotary joints, and improving the durability of the device. It also prevents the accumulation of gases and steam inside, ensuring a smooth flow of new saturated steam ejected from the screw shaft. As a result, the heat exchange efficiency between the high-temperature conveyed material and the saturated steam cooling medium is stably maintained, enabling uniform and efficient cooling of the conveyed material. Furthermore, since heated steam and gases tend to rise up the enclosure due to natural convection, providing an exhaust port at the top efficiently captures and discharges these gases, and also prevents the accumulation of flammable gases that may be generated from the conveyed material inside the enclosure, thus contributing to the safe operation of the device.

[0020] Claim 6 The invention described in claim 1 is, The supply port is provided with a rocker valve (30) that supplies the material while suppressing leakage of the atmosphere inside the housing and intrusion of outside air. The rocker valve is A casing (31) having an input port (31a) into which the conveyed material is fed, and a discharge port (31b) communicating with the supply port, A rotary valve (32) is rotatably arranged within the casing and has a plurality of vanes (32a) extending radially from the center, The invention is characterized by comprising a motor (80) that rotates the rotary valve.

[0021] According to this design, the rocker valve functions as an airlock at the supply port by incorporating a rotary valve driven by a motor and multiple vanes. Therefore, it is possible to suppress the leakage of the atmosphere (saturated steam) inside the enclosure, where the high-temperature conveyed material is cooled, from the supply port to the outside. This minimizes the loss of steam necessary for cooling, improves the thermal efficiency of the device, and enhances safety by preventing high-temperature steam from leaking into the working environment. Simultaneously, it reliably prevents outside air (oxygen) from entering the enclosure containing the high-temperature conveyed material through the supply port. As a result, the risk of ignition due to the reaction of high-temperature charred material with oxygen is significantly reduced, ensuring the safe operation of the cooling system. Furthermore, because the rotary valve is driven by a motor, the high-temperature conveyed material is continuously supplied quantitatively and stably from the inlet to the outlet without clogging. This maintains a constant amount of conveyed material supplied to the screw inside the enclosure, thus stabilizing the heat load within the cooling system. Stabilizing the thermal load is crucial for suppressing uneven cooling caused by steam ejected from the shaft and for uniformly cooling the entire conveyed object, contributing to improved final product quality and safe temperature control.

[0022] Claim 7 The invention described in claim 1 is, A temperature sensor (70) is provided in the housing for detecting the temperature inside the housing, A control unit (90) connected to the temperature sensor, The system further includes a steam control unit (600) provided in the piping (500) that introduces the steam into the hollow section (21a), connected to the control unit, and adjusting the amount of steam flowing through the piping. The control unit is characterized in that, when the temperature detected by the temperature sensor is above a predetermined set temperature, it activates the steam control unit to increase the amount of steam injected into the hollow section.

[0023] According to this configuration, a temperature sensor allows for real-time monitoring of the temperature inside the enclosure, that is, a temperature that approximates the temperature of the conveyed material. Even if there are variations in the temperature, quantity, or physical properties of the conveyed material discharged from the carbonization device, potentially leading to insufficient cooling, this configuration allows the control unit to immediately detect if the temperature of the conveyed material exceeds a predetermined set temperature (e.g., 250°C, below the ignition point), activate the steam control unit to automatically increase the amount of steam injected into the hollow section, thereby enhancing the cooling capacity through feedback control. This allows for immediate and proactive suppression of the risk of ignition of the conveyed material due to insufficient cooling, without human error or delays in response, and automatically maintains the stable operation and safety of the device. Furthermore, instead of continuously supplying an excessive amount of steam, adaptive control is achieved by supplying only the necessary amount of steam according to the actual temperature state of the conveyed material, thus suppressing the use of wasted steam and contributing to the optimization of energy efficiency (running costs). Furthermore, by reliably cooling the conveyed materials to below the set temperature, excessive heat load on subsequent processes is suppressed, contributing to the stable operation of the entire system and the acquisition of a final product with uniform quality and no uneven cooling.

[0024] Claim 8 The invention described in claim 1 is, The housing is characterized by comprising a substantially semicircular lower part (10a) that covers the lower half of the screw (20), and a rectangular tubular upper part (10b) that extends upward from the upper end of the lower part.

[0025] According to this design, the lower part of the enclosure is roughly semi-circular in shape, following the rotational shape of the screw, which suppresses the accumulation of conveyed material at the bottom of the enclosure and improves the conveying efficiency of the screw blades. Furthermore, by making the upper part rectangular, it becomes possible to easily provide a flat top surface (top wall) for installing equipment such as supply ports, exhaust ports, and sensors while securing the volume of the internal space, thereby improving the flexibility of the device design.

[0026] Furthermore, the symbols in parentheses for each means described in this section and in the claims are merely examples showing the correspondence with the specific means described in the embodiments below, and do not affect the scope of rights in the claims. [Brief explanation of the drawing]

[0027] [Figure 1] This is a front cross-sectional view of the cooling device. [Figure 2] This is a view taken along arrow AA in Figure 1, and is a left side view of the cooling device. [Modes for carrying out the invention]

[0028] (Structure of the cooling system) The cooling device 100 of this embodiment will be described below with reference to Figures 1 and 2. This cooling device 100 cools the high-temperature carbonized material discharged from a continuous carbonization device (not shown) and pre-cools it before supplying it to the next continuous cooling device. The cooling device 100 includes a housing 10, a screw 20, a rocker valve 30, a rotary joint 40, a motor 51, a reducer 52, a drive sprocket 61, a driven sprocket 62, and a chain 63.

[0029] The housing 10 is a horizontally elongated cylindrical housing having a space inside in which the screw 20 is arranged. The housing 10 is made of metal such as steel. As shown in Figure 2, the cross-sectional shape of the housing 10 in the short direction consists of a roughly semicircular lower part 10a that covers the lower half of the screw 20, and a rectangular tubular upper part 10b that extends upward from the upper end of the lower part. As shown in Figure 1, a supply port 10c is formed on the upstream side (right side in Figure 1) of the upper wall 10f of the upper part 10b of the housing 10 in the conveying direction. As shown in Figures 1 and 2, a connecting duct 10i extending upward is connected to the supply port 10c, and a rocker valve 30 for supplying conveyed material is attached to the upper end of this connecting duct 10i.

[0030] As shown in Figure 1, an exhaust port 10e is formed on the upper wall 10f of the upper part 10b of the housing 10, downstream in the conveying direction from the supply port 10c (connecting duct 10i) (left side in Figure 1), and communicates with the internal space of the housing 10. A hood 11 that protrudes upward is connected to the exhaust port 10e. Steam ejected from the shaft 21 of the screw 20 and gases generated from the conveyed material are discharged to the outside of the housing 10 from the exhaust port 10e.

[0031] A discharge port 10d for discharging cooled conveyed material is formed slightly upstream of the downstream end (left side in Figure 1) in the conveying direction at the bottom of the lower part 10a of the housing 10. A discharge chute 12 is connected below the discharge port 10d to guide the conveyed material to the next process.

[0032] The rocker valve 30 is attached to the upper end of the connecting duct 10i. As shown in Figure 2, the rocker valve 30 has a casing 31, a rotary valve 32 rotatably arranged inside the casing 31, and a motor 80 that rotates the rotary valve 32. The casing 31 is cylindrical in shape, with an inlet 31a formed at its upper end for introducing the material to be conveyed, and a discharge port 31b (shown in Figure 1) formed at its lower end that communicates with the connecting duct 10i (supply port 10c in Figure 1).

[0033] As shown in Figure 2, the rotary valve 32 has a plurality of vanes 32a that are formed radially from its center and are close to the inner circumferential surface of the casing 31. The motor 80 and the rotary valve 32 are rotationally connected by an annular member 81 such as a belt. The motor 80 rotates the rotary valve 32. The rocker valve 30 prevents steam from leaking out of the housing 10 through the supply port 10c and prevents outside air from entering the housing 10 through the supply port 10c, while the material to be conveyed is supplied to the inside of the housing 10 from the supply port 10c.

[0034] As shown in Figures 1 and 2, the screw 20 is rotatably positioned inside the housing 10 such that its shaft 21 extends horizontally. As shown in Figure 1, the screw 20 comprises a shaft 21 with a hollow section 21a formed inside, conveying blades 22 and reverse conveying blades 23 that protrude spirally from the outer circumferential surface of the shaft 21, and a plurality of first nozzles 24 and second nozzles 25 that communicate with the hollow section 21a and open to the outer circumferential surface of the shaft 21.

[0035] The conveying blades 22 are formed to convey material from the supply port 10c (right side in Figure 1) to the discharge port 10d (left side in Figure 1) of the housing 10 as the shaft 21 rotates. The first nozzles 24 are provided on the shaft 21 in the region where the conveying blades 22 are formed. As shown by the dashed line in Figure 1, the first nozzles 24 are provided in multiple locations along the longitudinal direction of the shaft 21, along a spiral shape that is substantially the same as the formation direction of the conveying blades 22. In this embodiment, eight nozzles are formed during one full rotation of the spiral.

[0036] The reverse conveying blades 23 are located on the shaft 21 at the downstream end of the housing 10 in the conveying direction (the left end in Figure 1), that is, further downstream than the discharge port 10d. The reverse conveying blades 23 are formed in a spiral direction opposite to that of the conveying blades 22, and are configured to forcibly push the conveyed material back toward the discharge port 10d side (the right side in Figure 1) when the shaft 21 rotates. This is to prevent the conveyed material from moving to the back of the housing 10 without being fully discharged from the discharge port 10d due to its physical properties or carbonization state. Conveyed material that has passed the discharge port 10d is forcibly returned toward the discharge port 10d side by these reverse conveying blades 23, thereby promoting discharge and preventing it from sticking or accumulating at the back of the housing 10.

[0037] The second nozzle 25 is provided on the shaft 21 in the region where the reverse conveying blades 23 are formed. As shown by the dashed line in Figure 1, multiple second nozzles 25 are provided along the longitudinal direction of the shaft 21 in a spiral shape that is approximately the same as the direction in which the reverse conveying blades 23 are formed. In this embodiment, eight nozzles are formed in the spiral that completes one full turn. Since the second nozzles 25 are also provided in the region where the reverse conveying blades 23 are provided, steam can be injected into the conveyed material that is pushed back just before discharge, suppressing uneven cooling and physically preventing the conveyed material from sticking at the end of the housing 10 using the force of the steam.

[0038] The shaft 21 of the screw 20 penetrates the end walls 10h at both longitudinal ends of the housing 10. The upstream end of the shaft 21 in the transport direction (right side in Figure 1) is rotatably supported by a bearing 71 fixed to the end wall 10h of the housing 10.

[0039] The downstream end of the shaft 21 in the transport direction (left side in Figure 1) is also rotatably supported by a bearing 71 fixed to the end wall 10h of the housing 10. Furthermore, a rotary joint 40 is connected to the end of the shaft 21 that protrudes outward from the bearing 71.

[0040] A saturated steam generating unit 700, consisting of a boiler and the like, is provided around the cooling device 100. A pipe 500 with a steam control valve 600 interposed therein is connected to the saturated steam generating unit 700. The steam control valve 600 adjusts the flow rate of steam circulating through the pipe 500. The rotary joint 40 rotatably supports the end of the shaft 21 and is a joint to which the pipe 500 is connected, for introducing saturated steam generated in the saturated steam generating unit 700 into the hollow part 21a inside the rotating shaft 21.

[0041] To rotate the screw 20, a motor 51 and a reduction gear 52 are positioned near the upstream side of the housing 10 in the transport direction (right side in Figure 1). A drive sprocket 61 is fixed to the output shaft of the reduction gear 52. On the other hand, a driven sprocket 62 is fixed to the upstream end of the shaft 21 of the screw 20 (outside the bearing 71). A chain 63 is wrapped between these two sprockets 61 and 62, and the driving force of the motor 51 is transmitted to the shaft 21 via the chain 63, causing the screw 20 to rotate.

[0042] As shown in Figure 1, a temperature sensor 70 is provided on the upper wall 10f of the housing 10, near the discharge port 10d, facing the internal space of the housing 10. This temperature sensor 70 is provided to detect the temperature of the conveyed material (carbonized material) cooled by the cooling device 100.

[0043] The temperature sensor 70 is connected to the control unit 90. The control unit 90 is connected to an alarm generation unit 95. The temperature sensor 70 confirms that the transported material is cooled to a temperature below which it may react with oxygen and generate heat (e.g., 250°C). If the control unit 90 detects that the temperature of the transported material is above a predetermined set temperature (e.g., 250°C), it is configured to activate an alarm via the alarm generation unit 95 from the standpoint of suppressing fire. The alarm generation unit 95 may be, for example, a speaker that emits an alarm sound, a light that emits an alarm light, or a screen that displays an alarm.

[0044] The control unit 90 is connected to a steam control valve 600 located in the piping 500 through which saturated steam is supplied from the saturated steam generator 700. When the temperature sensor 70 detects a temperature above the set temperature, the control unit determines that the cause is insufficient saturated steam supply to the rotary joint 40 and automatically increases the amount of saturated steam supplied by opening the steam control valve 600 (steam volume increase). This promotes the cooling of the conveyed material and allows it to quickly drop to a safe temperature.

[0045] (Operation of the cooling system) Next, the operation of the cooling device 100 in this embodiment will be described. First, the high-temperature (for example, about 250°C to 300°C) conveyed material (carbonized material) discharged from the carbonization device (not shown) in the previous process is supplied to the inlet 31a of the rocker valve 30. The motor 80 (shown in Figure 2) rotates the rotary valve 32, thereby suppressing leakage of the atmosphere (saturated steam) inside the housing 10 to the outside and preventing outside air from entering the housing 10, while the conveyed material is continuously supplied into the housing 10 via the discharge port 31b (shown in Figure 1) of the casing 31, the connecting duct 10i, and the supply port 10c of the housing 10.

[0046] Simultaneously, when the motor 51 is driven, its driving force is transmitted to the shaft 21 of the screw 20 via the reduction gear 52, drive sprocket 61, chain 63, and driven sprocket 62, causing the shaft 21 to rotate at a predetermined speed. As the shaft 21 rotates, the conveying blades 22 cause the material supplied from the supply port 10c to be conveyed horizontally through the housing 10 towards the discharge port 10d (left side in Figure 1).

[0047] In parallel, saturated steam is supplied from the saturated steam generation unit 700 to the rotary joint 40 via the piping 500 and the steam control valve 600. The rotary joint 40 continuously injects saturated steam from the end of the rotating shaft 21 into the hollow portion 21a inside it.

[0048] The saturated steam supplied to the hollow section 21a is ejected directly onto the conveyed object from a plurality of first nozzles 24 and second nozzles 25 provided along the entire length of the shaft 21. The first nozzles 24 eject steam in the area where the conveying blades 22 are provided, cooling the conveyed object while it is being conveyed. The second nozzles 25 eject steam in the area where the reverse conveying blades 23 are provided near the discharge port 10d, cooling the conveyed object just before discharge.

[0049] The conveyed material is rapidly cooled by heat exchange through direct contact with saturated steam (approximately 100°C) ejected from the center of the shaft 21. Because the nozzle is spirally arranged on the shaft 21, the steam is uniformly ejected over the entire conveyed material as the screw 20 rotates, ensuring even cooling from the center outwards.

[0050] Near the discharge port 10d, a temperature sensor 70 constantly monitors the temperature of the conveyed material after cooling. It confirms that the temperature of the conveyed material is maintained below a predetermined temperature (e.g., 250°C) to avoid the risk of ignition. In the event that the temperature of the conveyed material exceeds the set temperature, the control unit 90 activates an alarm via the alarm generation unit 95 and automatically increases the supply of saturated steam to the rotary joint 40 by increasing the opening of the steam control valve 600, thereby strengthening the cooling capacity and rapidly lowering the temperature of the conveyed material.

[0051] The sufficiently cooled conveyed material reaches the downstream end of the screw 20 in the conveying direction (left side of Figure 1), falls by its own weight from the discharge port 10d located on the downstream side of the bottom of the housing 10 in the conveying direction, and is discharged via the discharge chute 12 to the next process (e.g., a continuous cooling device).

[0052] In this case, if some of the conveyed material cannot be discharged from the outlet 10d due to its physical properties or carbonization status and attempts to move further into the housing 10 (towards the leftmost wall in Figure 1, which is the furthest downstream side in the conveying direction), the reverse conveying blades 23 forcibly push the conveyed material back towards the outlet 10d (right side in Figure 1). This promotes the discharge of the conveyed material to the outlet 10d and suppresses adhesion and accumulation at the end of the housing 10 (downstream end in the conveying direction).

[0053] The saturated steam used for cooling and the gases generated from the transported material are collected in the hood 11 located on the top of the enclosure 10 and discharged to the outside of the enclosure 10 through the exhaust port 10e.

[0054] (Effect of the cooling device) The effects of the cooling device 100 of this embodiment will be described below. The cooling device 100 of this embodiment includes a housing 10 and a screw 20 rotatably disposed within the housing 10. The screw 20 includes a shaft 21 with a hollow portion 21a formed inside, blades 22 and 23 that protrude spirally from the outer circumferential surface of the shaft 21, and a plurality of nozzles 24 and 25 that communicate with the hollow portion 21a and open to the outer circumferential surface of the shaft 21. The housing 10 includes a supply port 10c into which the conveyed material is supplied and a discharge port 10d into which the conveyed material is discharged. Steam is injected into the hollow portion 21a of the shaft 21, and as the screw 20 rotates, the conveyed material is transported from the supply port 10c to the discharge port 10d, and steam is ejected from the plurality of nozzles 24 and 25 to cool the conveyed material.

[0055] According to this configuration, steam (saturated steam in this embodiment) is supplied to the inside of the screw 20 shaft 21, and the steam is directly ejected from nozzles 24 and 25 provided on the shaft 21 toward the conveyed material. Furthermore, since the steam is ejected from nozzles 24 and 25 formed on the shaft 21, compared to a configuration in which steam is ejected into the housing 10, the conveyed material is cooled from the center, allowing for more even and uniform cooling. This makes it possible to efficiently cool high-temperature conveyed material from the inside. In particular, when the conveyed section is high-temperature carbonized material discharged from a carbonization device, it can be quickly cooled to below the temperature at which it reacts with oxygen and ignites (for example, 250°C), thus suppressing the risk of ignition during conveying or in subsequent processes. In addition, unlike cooling by simply adding water, it suppresses problems such as the rise in internal temperature due to the heat of adsorption of the conveyed material, making it possible to cool the conveyed material safely.

[0056] Furthermore, the steam supplied inside the shaft 21 of the screw 20 is saturated steam.

[0057] According to this method, by using saturated steam as a cooling medium, high-temperature materials can be cooled at a stable temperature of approximately 100°C. This makes it possible to rapidly cool the materials, especially high-temperature carbonized materials discharged from a carbonization plant, to below their ignition temperature (e.g., below 200°C). Furthermore, compared to simply adding water, this method suppresses the risk of the internal temperature rising again due to the heat of adsorption of the materials, allowing for safer cooling of the carbonized materials.

[0058] Furthermore, the blades consist of a conveying blade 22 that conveys the material from the supply port 10c towards the discharge port 10d, and a reverse conveying blade 23 that is located downstream of the discharge port 10d in the conveying direction and is formed in a spiral shape in the opposite direction to the conveying blade 22.

[0059] According to this design, even if the conveyed material is not fully discharged from the discharge port 10d and attempts to move towards the back of the housing 10, the reverse conveying blades 23 forcibly push it back towards the discharge port 10d. This prevents leakage of the conveyed material and prevents it from sticking and accumulating at the ends of the housing 10.

[0060] Furthermore, the multiple nozzles 24 and 25 are arranged spirally along the direction in which the blades 22 and 23 are formed.

[0061] According to this design, since the nozzles 24 and 25 are arranged spirally along the formation direction of the blades 22 and 23, when the screw 20 rotates, the nozzles that inject steam move in both the circumferential and axial directions. Therefore, the concentration of steam ejection at specific locations is suppressed, and the steam can be brought into contact with the entire conveyed material being transported inside the housing 10 over an extremely wide and uniform area. Furthermore, the stirring and mixing action of the conveyed material by the conveying blades 22 is linked to the steam injection from the spiral nozzles 24. As a result, steam is immediately injected even to the high-temperature parts of the conveyed material that have been newly exposed to the surface by the conveying blades 22, effectively suppressing uneven cooling from the center to the surface of the conveyed material and achieving extremely efficient heat exchange. In addition, since the steam ejection path is constantly changing with the rotation of the screw 20, the steam passage within the conveyed material layer is suppressed, and the permeability of steam to the entire conveyed material is increased.

[0062] Furthermore, a rotary joint 40 is connected to one end of the shaft 21 to rotatably support the shaft 21 and to introduce steam supplied from the outside into the hollow section 21a.

[0063] According to this design, the rotary joint 40 serves both as a bearing 71 supporting the rotating shaft 21 and as a coupling for introducing steam, thus reducing the number of parts and simplifying the structure of the device. Furthermore, it allows for a stable supply of steam from an external source to the rotating shaft 21.

[0064] Furthermore, an exhaust port 10e for discharging internal gas is provided at the top 10b of the housing 10.

[0065] According to this design, excess saturated steam used for cooling and gases generated from high-temperature conveyed materials can be properly discharged to the outside through the exhaust port 10e located at the top of the housing 10. This prevents an abnormal rise in internal pressure within the housing 10, thus avoiding excessive physical stress on the housing 10 body and sealing parts such as the bearings 71 and rotary joint 40, and improving the durability of the device. It also prevents the accumulation of gases and steam inside, ensuring a smooth flow of new saturated steam ejected from the shaft 21 of the screw 20. As a result, the heat exchange efficiency between the high-temperature conveyed materials and the saturated steam cooling medium is stably maintained, enabling uniform and efficient cooling of the conveyed materials. Furthermore, since heated steam and gases tend to rise in the housing 10 due to natural convection, providing an exhaust port 10e at the top 10b efficiently captures and discharges these gases, and also prevents the accumulation of flammable gases that may be generated from the conveyed materials inside the housing 10, thus contributing to the safe operation of the device.

[0066] Furthermore, a rocker valve 30 is provided at the supply port 10c. The rocker valve 30 comprises a casing 31, a rotary valve 32, and a motor 80.

[0067] According to this, the rocker valve 30 functions as an airlock at the supply port 10c by being equipped with a rotary valve 32 rotated by the motor 80 and multiple vanes 32a. Therefore, leakage of the atmosphere (saturated steam) inside the housing 10 where the high-temperature conveyed material is cooled to the outside from the supply port 10c can be suppressed. This minimizes the loss of steam necessary for cooling, improves the thermal efficiency of the device, and suppresses the leakage of high-temperature steam into the working environment, thereby improving safety. At the same time, it can reliably suppress the intrusion of outside air (oxygen) into the housing 10 where the high-temperature conveyed material is present through the supply port 10c. As a result, the risk of high-temperature charred material reacting with oxygen and igniting can be greatly reduced, and the safe operation of the cooling device 100 can be guaranteed. Furthermore, because the rotary valve 32 is rotated by the motor 80, the high-temperature conveyed material is continuously supplied quantitatively and stably from the input port 31a to the discharge port 31b without clogging. As a result, the amount of conveyed material supplied to the screw 20 inside the housing 10 is kept constant, and the heat load inside the cooling device 100 is stabilized. Stabilizing the thermal load is crucial for suppressing uneven cooling caused by steam ejected from shaft 21 and for uniformly cooling the entire conveyed material, contributing to improved final product quality and safe temperature control.

[0068] The housing 10 is also equipped with a temperature sensor 70, a control unit 90, and a steam control valve 600. When the temperature detected by the temperature sensor 70 is above the set temperature, the control unit 90 activates the steam control valve 600 to increase the amount of steam supplied to the hollow section 21a.

[0069] According to this configuration, the temperature sensor 70 can monitor the temperature inside the housing 10, that is, a temperature approximating the temperature of the conveyed material, in real time. Even if there are variations in the temperature, quantity, or physical properties of the conveyed material discharged from the carbonization device, which could lead to insufficient cooling, this configuration allows the control unit 90 to immediately detect if the temperature of the conveyed material exceeds a predetermined set temperature (for example, 250°C, below the ignition point), activate the steam control valve 600 to automatically increase the amount of steam injected into the hollow section 21a, and enhance the cooling capacity through feedback control. This makes it possible to immediately and proactively suppress the risk of ignition of the conveyed material due to insufficient cooling without human error or delays in response, and to automatically maintain the stable operation and safety of the device. Furthermore, instead of continuously supplying an excessive amount of steam at all times, adaptive control is achieved by supplying only the necessary amount of steam according to the actual temperature state of the conveyed material, thus suppressing the use of wasted steam and contributing to the optimization of energy efficiency. Furthermore, by reliably cooling the conveyed materials to below the set temperature, excessive heat load on subsequent processes is suppressed, contributing to the stable operation of the entire system and the acquisition of a final product with uniform quality and no uneven cooling.

[0070] Furthermore, the housing 10 is composed of a roughly semicircular lower part 10a and a rectangular tubular upper part 10b.

[0071] According to this design, since the lower part 10a of the housing 10 is approximately semicircular in shape to conform to the rotational shape of the screw 20, it is possible to suppress the accumulation of conveyed material at the bottom of the housing 10 and improve the conveying efficiency of the blades 22 and 23 of the screw 20. Furthermore, by making the upper part 10b rectangular, it is possible to easily provide a flat top surface (upper wall 10f) for installing equipment such as a supply port 10c, an exhaust port 10e, and a temperature sensor 70 while securing the volume of the internal space, thereby improving the freedom of device design.

[0072] (Other embodiments) The present invention has been described above in relation to the most practical and preferred embodiments at present. However, the present invention is not limited to the embodiments disclosed in this specification and can be modified as appropriate without contradicting the gist or idea of ​​the invention as can be inferred from the claims and the specification as a whole. Cooling devices with such modifications should also be understood to be included within the technical scope of the patent.

[0073] In the embodiments described above, carbonized material was used as an example of the material to be cooled, but the present invention is not limited thereto. It can be similarly applied to other powders and granules that are discharged at high temperatures and require cooling for fire prevention, quality preservation, or subsequent processing, such as incinerator ash, minerals, or processed food products.

[0074] Furthermore, although the embodiment shows a configuration in which a motor 51 is used as the drive source for the screw 20 and the driving force is transmitted via a chain 63 and sprockets 61 and 62, the drive method is not limited to this. For example, a geared motor with a direct drive between the reduction gear 52 and the shaft 21 may be used, or a gear mechanism may be used instead of the chain 63, or other known drive transmission mechanisms may be adopted.

[0075] Furthermore, although the embodiment shows examples in which eight first nozzles 24 and eight second nozzles 25 are formed along a spiral rotation, the number, arrangement, and shape of the nozzles are not limited to this. For example, the number of nozzles can be increased or decreased as appropriate depending on the amount and temperature of the material being conveyed, and their arrangement is not limited to a spiral; they may be arranged linearly or in a staggered pattern along the longitudinal direction of the axis 21. Also, the shape of the nozzles is not limited to circular holes; for example, they may be slit shapes or nozzle shapes that can inject steam over a wide area.

[0076] Furthermore, although the cross-sectional shape of the housing 10 is a combination of a roughly semicircular lower part 10a and a rectangular tubular upper part 10b, it is not limited to this, and may be, for example, a cylindrical casing overall, or a U-shaped channel casing with an open top.

[0077] The installation location of the temperature sensor 70 is not limited to the upper wall 10f near the discharge port 10d. For example, it can be moved to any other location where the temperature of the conveyed material after cooling can be appropriately detected as a representative value, such as inside the discharge chute 12 or on the side of the housing 10. [Explanation of Symbols]

[0078] 10 cabinets 10a Lower part 10b top 10c supply port 10d outlet 10e exhaust port 20 Screws 21 axes 21a Hollow part 22 Conveyor blades 23 Reverse conveying blades 24 1st spout 25 2nd spout 30 Rocker valves 31 Casing 31a Inlet 31b Discharge port 32 Rotary Valves 32a Vane 40 Rotary Joint 70 Temperature Sensor 80 motor 90 Control Unit 500 piping 600 Steam control valve (steam control unit)

Claims

1. The enclosure (10) and The housing includes a screw (20) that is rotatably disposed within the housing, The aforementioned screw is A shaft (21) having a hollow portion (21a) formed inside, The blades (22, 23) protrude spirally from the outer surface of the shaft, It comprises a plurality of nozzles (24, 25) that communicate with the hollow portion and open to the outer surface of the shaft, The housing has a supply port (10c) into which the transported material is supplied, It is equipped with an outlet (10d) for discharging the conveyed material, Saturated steam at approximately 100°C is injected into the hollow portion of the shaft. The transported material is carbonized material discharged from the carbonization apparatus. A cooling device characterized in that, as the screw rotates, saturated steam at approximately 100°C is directly ejected from a plurality of nozzles onto the carbide being transported from the supply port to the discharge port, thereby creating an atmosphere of saturated steam at approximately 100°C inside the housing, blocking contact between the carbide and oxygen with the atmosphere of saturated steam at approximately 100°C, suppressing the rise in internal temperature due to the heat of adsorption of the carbide, and thus cooling the carbide and preventing spontaneous combustion.

2. The aforementioned feathers are, A conveying blade (22) that conveys the conveyed material from the supply port (10c) toward the discharge port (10d), The cooling device according to claim 1, characterized in that it comprises a reverse conveying blade (23) provided downstream of the discharge port (10d) in the conveying direction and formed in a spiral shape opposite to that of the conveying blade.

3. The cooling device according to claim 1, characterized in that the plurality of nozzles are arranged spirally along the direction in which the blades are formed.

4. The cooling device according to claim 1, characterized in that a rotary joint (40) is connected to one end of the shaft for rotatably supporting the shaft and for introducing the steam supplied from the outside into the hollow portion.

5. The cooling device according to claim 1, characterized in that an exhaust port (10e) for discharging internal gas is provided at the upper part (10b) of the housing.

6. The supply port is provided with a rocker valve (30) that supplies the material while suppressing leakage of the atmosphere inside the housing and intrusion of outside air. The rocker valve is A casing (31) having an input port (31a) into which the conveyed material is fed, and a discharge port (31b) communicating with the supply port, A rotary valve (32) is rotatably arranged within the casing and has a plurality of vanes (32a) extending radially from the center, The cooling device according to claim 1, further comprising a motor (80) for rotationally driving the rotary valve.

7. A temperature sensor (70) is provided in the housing for detecting the temperature inside the housing, A control unit (90) connected to the temperature sensor, The system further includes a steam control unit (600) provided in the piping (500) that introduces the steam into the hollow section (21a), connected to the control unit, and adjusting the amount of steam flowing through the piping. The cooling device according to claim 1, characterized in that the control unit activates the steam control unit to increase the amount of steam injected into the hollow section when the temperature detected by the temperature sensor is above a predetermined set temperature.

8. The cooling device according to claim 1, characterized in that the housing is composed of a substantially semicircular lower part (10a) that covers the lower half of the screw and a rectangular tubular upper part (10b) that extends upward from the upper end of the lower part.

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