JP2013154892A - Silo, and operating method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a silo which can avoid occurrence of the fixation and bridging of a stored article to the internal wall of the storage tank at storage over a long period of time, and can suppress the variation in characteristics of the stored article.SOLUTION: A silo 10 includes: a storage tank 11; a throwing-in mechanism 13 which throws an article A to be stored into the storage tank 11; a discharging mechanism 20 which discharges the stored article from the storage tank 11; and a circulating mechanism 24 in which the stored article A is discharged from the storage tank 11, and thrown into the storage tank 11 again. The circulating mechanism 24 includes: the throwing-in mechanism 13; the discharging mechanism 20; and a circulating-carrying path 25 which carries the stored article A discharged from the discharging mechanism 20 to the throwing-in mechanism 13. The discharging mechanism 20 includes a path-switching mechanism 23 which switches whether the stored article A discharged from the storage tank 11 is carried to a discharging path 22 on the outside of the system or is carried to the circulating-carrying path 25.

Description

  The present invention relates to a silo including a storage tank, an input mechanism that inputs a storage material into the storage tank, and a discharge mechanism that discharges the storage material from the storage tank, and a silo operating method.

Patent Document 1 discloses a silo that uses a granular material such as sludge as a storage object.
As shown in FIG. 3, the silo includes a cylindrical storage tank 1 in which a loading port 11 is provided at the top and a discharge port 12 is formed on the bottom surface.

  The sludge that becomes the stored material 2 is pumped by the pump p and is input to the storage tank 1 from the input port 11. The storage 2 that has fallen from the discharge port 12 after storage is discharged to the outside via the chute 12a and the screw type discharge device 4 that are continuous with the discharge port 12.

  On the bottom surface of the storage tank 1, a scraping device 3 having a rotatable blade 31 that scrapes the stored material 2 and sends it to the discharge port 12 is disposed.

  In the silo described above, the discharge port 12 is formed at the flat bottom of the cylindrical storage tank 1, but the lower end portion of the cylindrical storage tank is formed to be tapered, and the discharge port is formed at the tip thereof. The shape of the storage tank 1, such as a silo, varies.

  As disclosed in Patent Document 2, in many storage tanks and hoppers, a vibration device such as a vibrator or a striking device such as an air knocker is attached to a side surface thereof, and the storage tank is vibrated to form a storage. Occurrence of an inconvenient situation such as the destruction of the bridge to be removed or the removal of the deposit fixed to the wall surface has been avoided.

Japanese Patent No. 3874349 JP 2002-308445 A

  However, in the above-described striking device such as a vibration device or an air knocker, when a granular material is stored in a storage tank for a long period of several tens of days or several months, a bridge breakage or a wall surface formed in the storage There was a problem that the removal of the fixed substance on the surface could not be performed properly. Furthermore, there has been a risk that the properties of the stored product will vary, and it will not be possible to store the stored product in an appropriate state.

  For example, the powder particles in the lower layer of the storage tank are consolidated for a long time, resulting in a situation where they are firmly bonded to each other and cannot be easily broken by the striking device, or the upper and lower layers of the storage tank As a result, the water content may fluctuate or gas may be generated from the storage, resulting in a situation that cannot be dealt with by the striking device.

  In view of the above-described problems, an object of the present invention is a silo and a silo capable of avoiding the sticking of the stored matter to the inner wall of the storage tank and the occurrence of a bridge during storage for a long period of time and suppressing the fluctuation of the properties of the stored matter. Is to provide a driving method.

  In order to achieve the above-described object, the first characteristic configuration of the silo according to the present invention includes a storage tank, and a charging mechanism for charging the storage tank, as described in claim 1 of the claims. A silo having a discharge mechanism for discharging the stored material from the storage tank, and a circulation mechanism for discharging the stored material from the storage tank and throwing it into the storage tank again, and the stored material in the storage tank And a circulation mechanism that is configured to operate based on the property of the reservoir monitored by the monitoring mechanism.

  Even when storing the stored matter for a long period of time, it is possible to cause the stored matter to flow inside the storage tank by circulating it so that the stored matter is discharged from the storage tank and re-entered into the storage tank by the circulation mechanism. become able to. As a result, while maintaining the fluidity of the stored matter, it becomes possible to maintain its homogeneity by suppressing fluctuations in its properties, and further, the adhering of the stored matter to the inner wall of the storage tank and the bridge without providing a striking device Can be avoided.

  There are variations in the degree of fluctuations in the properties of the stored matter due to various conditions such as temperature, humidity, season, and storage period. On the other hand, there is a risk of promoting property fluctuations when the stored matter is circulated constantly. Therefore, if the property of the storage is monitored by the monitoring mechanism and it is determined when to activate the circulation mechanism based on the result, the fluctuation of the property of the storage can be appropriately suppressed, and the energy required for circulation Cost can also be reduced.

  In the second characteristic configuration, as described in the second aspect, in addition to the first characteristic configuration described above, the circulation mechanism stores the storage discharged from the discharge mechanism via the input mechanism. A path switching mechanism that includes a circulation conveyance path having a conveyance mechanism for conveying to a tank and that switches whether the storage discharged from the discharge mechanism is conveyed to a discharge path to the outside of the system or to the circulation conveyance path. It is in the point equipped with.

  Since the storage discharged from the discharge mechanism is configured to be conveyed to the storage tank via the input mechanism, there is no need to provide a separate discharge mechanism or input mechanism for circulation in the storage tank, and the equipment cost Can be suppressed. Further, since the route from the discharge mechanism to the route switching mechanism can be shared as a part of the circulation transport route, the equipment cost can be similarly reduced. Furthermore, since the storage can be discharged from the bottom of the storage tank that is easily consolidated through the discharge mechanism and can be input again into the storage tank through the input mechanism, the storage path can be changed from the storage path to the discharge path. It is possible to effectively avoid the occurrence of an unfavorable situation such as sticking of the reservoir.

  In the third feature configuration, as described in claim 3, in addition to the second feature configuration described above, the discharge amount per unit time of the storage material to the circulation conveyance path is stored in the discharge path. It is in the point provided with the discharge amount adjustment mechanism which makes it less than the discharge amount per unit time.

  When discharging the stored matter from the storage tank to the outside of the system, the discharging mechanism needs to be configured to ensure a discharge amount per unit time according to the processing capability of the processing equipment installed outside the system. However, if the amount of discharge per unit time can be reduced when circulating the stored matter through the circulation mechanism compared to when the stored matter is discharged out of the system, the energy cost required for circulating and transferring the stored matter through the circulation mechanism As well as the cost of equipment can be reduced because there is no need to increase the size of the circulation mechanism. In addition, if the amount of circulated transport per unit time is reduced, the stored material in the storage tank can be circulated in a quasi-static state, and sudden property fluctuations of the stored material are not caused.

  In the fourth feature configuration, as described in claim 4, in addition to the second or third feature configuration described above, a plurality of the storage tanks are arranged in parallel, and the circulation conveyance path is discharged from each discharge mechanism. In addition to being shared so as to circulate and transport the stored storage, a horizontal transport path for transporting the stored material from the circulating transport path to the storage mechanism of each storage tank is connected, and the stored material falls to the end of the horizontal transport path It is in the point where the chute to be formed is formed.

  In the case where a plurality of storage tanks are arranged in parallel, the circulation transport path can be shared so as to circulate and transport the storage material discharged from each discharge mechanism, so that the facility cost can be suppressed. And when transporting the stored material to the input mechanism of each storage tank along the horizontal transport path, there is a risk that the remaining material will solidify at the end of the horizontal transport path and block the path, but at the end of the path Since the chute for dropping the storage is formed, the storage does not stay at the end of the path, and the path is not blocked.

  The first characteristic configuration of the silo operation method according to the present invention is, as described in claim 5, a storage tank, a charging mechanism for charging a storage tank, and a discharge for discharging the storage tank from the storage tank. A silo operation method comprising a mechanism and a circulation mechanism that discharges the stored material from the storage tank and inputs the storage material into the storage tank again, after the stored material is input into the storage tank from the input mechanism A discharge step of operating the discharge mechanism to discharge the storage out of the system, a property detection step of detecting a property of the storage charged in the storage tank, and a storage of the storage detected in the property detection step And a circulation step in which the circulating mechanism is operated based on the property fluctuation state to circulate the storage.

  After the storage tank is filled with the storage, the property detection step is executed before the discharge step is executed. Based on the fluctuation state of the property of the storage detected in the property detection step, for example, storage such as variation in moisture distribution or temperature distribution, local detection of a high temperature region, or generation of gas. When a change in the properties of the object is observed, a circulation step is executed. As a result, the storage can be continuously stored in a uniform and stable state, and the fluidity of the storage in the discharge step can be maintained well. Further, it is possible to avoid the adhesion of the stored matter to the inner wall of the storage tank and the occurrence of a bridge without providing a separate striking device. For example, the property detection step can be executed at a certain interval. In the circulation step, the stored storage can be circulated continuously or intermittently. Moreover, in the circulation step, it is preferable that the entire amount of the storage material filled in the storage tank is circulated, but a part thereof may be circulated.

  In the second feature configuration, in addition to the first feature configuration described above, the discharge amount per unit time of the storage by the discharge mechanism at the time of execution of the circulation step is It is in a point smaller than the discharge amount per unit time of the stored matter by the discharge mechanism when the discharge step is executed.

  When discharging the stored matter from the storage tank to the outside of the system, the discharging mechanism needs to be configured to ensure a discharge amount per unit time according to the processing capability of the processing equipment installed outside the system. However, if the amount of discharge per unit time can be reduced when circulating the stored matter through the circulation mechanism compared to when the stored matter is discharged out of the system, the energy cost required for circulating and transferring the stored matter through the circulation mechanism As well as the cost of equipment can be reduced because there is no need to increase the size of the circulation mechanism. In addition, if the amount of circulated transport per unit time is reduced, the stored material in the storage tank can be circulated in a quasi-static state, and sudden property fluctuations of the stored material are not caused.

  In addition to the first or second characteristic configuration described above, the third characteristic configuration is a scraping mechanism that scrapes the accumulated matter accumulated at the bottom of the storage tank to the discharge port as described in claim 7. And the silo is configured to operate the scraping mechanism at least when the circulation step is executed.

  If the scraping mechanism is activated during the execution of the circulation step, even if a part of the storage is solidified in the storage tank, the storage can smoothly fall out from the outlet. .

  In the fourth feature configuration, as described in claim 8, in addition to any of the first to third feature configurations described above, the circulation step has a property of the reservoir detected in the property detection step. It is executed when it fluctuates beyond a predetermined threshold.

  By circulating and homogenizing when the property of the stored material exceeds a predetermined threshold value, the quality of the stored material filled in the storage tank can be maintained within an allowable range.

  As described above, according to the present invention, it is possible to reduce the amount of discharge due to the occurrence of sticking inside the silo, and further to prevent fluctuations in properties accompanying storage, etc. A driving method can be provided.

Illustration of processing equipment Illustration of the control unit Illustration of a conventional silo

  Hereinafter, the silo and the silo operation method according to the present invention will be described.

  As shown in FIG. 1, the sludge treatment facility 1 is provided with two silos 10 (10A, 10B) for temporarily storing the storage A.

  In the present embodiment, the stored matter A is sludge generated at a sewage treatment plant and dehydrated, and is high-calorie granular sludge dried with heated waste oil or the like and having a water content of several percent. Will be described.

  In order to reuse such sludge as fuel, the sludge is once stored in the storage tank 11, and component analysis is performed during that time. As a result, if the component is within a certain allowable range, the component is discharged from the storage tank 11 and carried out to a demand destination in order to be used as fuel.

  Since a period of about one month is required until an analysis result is obtained, the storage A is temporarily stored in the silo 10 during this period. That is, the quality of the sludge is lot-managed for each silo 10.

  The silo 10 (10A, 10B) includes a pair of storage tanks 11 (11A, 11B), and an input mechanism 13 (13A, 13B) that inputs the sludge that is the storage A into each storage tank 11 (11A, 11B). And a discharge mechanism 20 that discharges the stored material A from the storage tank 11 (11A, 11B). In the drawing, only the discharge mechanism of the silo 10A is provided with a reference numeral, but the discharge mechanism of the silo 10B has the same configuration.

  The sludge carried into the treatment facility 1 by the truck 2 is received by the receiving hopper 3, and the sludge in the receiving hopper 3 is conveyed to the charging path 5 by a fixed amount by the screw type conveying mechanism 4 and further provided in the horizontal stage provided at the subsequent stage. It is conveyed to the conveyance path 6.

  The feeding path 5 and the horizontal transport path 6 are transported by a case conveyor or the like that transports sludge, which is granular material, in the path by a plurality of plates connected by a chain mechanism driven by a motor M. It has a mechanism.

  The sludge transported to the horizontal transport path 6 is input and stored in the storage tanks 11A and 11B via the input mechanisms 13A and 13B. In the following description, a part that does not need to be described separately between the silo 10A and the silo 10B is simply referred to as a silo 10, and the configuration of each part of the silo 10 is the same.

  Each charging mechanism 13A, 13B is provided with an electric damper, and the sludge transferred through the horizontal transfer path 6 is selectively charged into the storage tank 11A and the storage tank 11B by opening / closing control of the electric damper.

  The horizontal transport path 6 for transporting sludge to the input mechanism 13 (13A, 13B) is shared to reduce the equipment cost. Further, a chute 7 is formed at the end of the horizontal transfer path 6 so that sludge that has not been input from any of the input mechanisms 13A, 13B of the storage tanks 11A, 11B falls from the chute 7 to the lower transfer path 21. It is configured. This is in order to avoid clogging of the path due to the residual sludge conveyed and solidified at the end of the horizontal transport path 6.

  The discharge mechanism 20 includes a discharge port 14, a scraping mechanism 15, a screw-type discharge conveyance mechanism 16 (hereinafter simply referred to as “screw-type conveyance mechanism 16”), a discharge gate 18, and a conveyance path 21. I have. A pair of the discharge port 14, the screw type transport mechanism 16, and the discharge gate 18 are provided.

  The discharge port 14 is formed on the bottom surface 11 a of the storage tank 11, and the storage A deposited on the bottom surface 11 a of the storage tank 11 is scraped to the discharge port 14 by the scraping mechanism 15. The scraping mechanism 15 includes a rotor 15a that is driven by a hydraulic motor or an electric motor, and a pair of scraping blades 15b that extend in the radial direction around the rotation axis of the rotor 15a. The scraping blades 15b are not limited to two but may be one or may be composed of a plurality of three or more.

  When a control unit 30 to be described later drives and controls the rotor 15a, the pair of scraping blades 15b rotate around the rotation axis P along the bottom surface 11a of the storage tank 11 so as to cross the discharge port 14, and the storage tank 11 The stored material A deposited on the bottom is scraped to the discharge port 14 and falls naturally from the discharge port 14.

  At the time of discharging the stored material, the stored material A in the storage tank 11 naturally falls out of the discharge port 14 by its own weight. At this time, if the scraping mechanism 15 is operated to scrape the deposit A accumulated on the bottom of the storage tank 11 to the discharge port 14, even if a bridge occurs in the reservoir 11, it can be easily destroyed. It is possible to avoid inconveniences such as occurrence of an undesired situation in which the stored matter 14 stays in the storage tank 11 and locally solidifies.

  In addition, the discharge port 14 does not necessarily need to be formed in the bottom surface 11a of the storage tank 11, for example, the bottom side of the silo so that the storage A naturally falls out by its own weight, such as the lower end of the side wall constituting the silo. What is necessary is just to be formed. Further, if the scraping mechanism 15 is continuously driven until the discharge of the storage A in the storage tank 11 is completed, even if cross-linking occurs in the storage tank 11, the storage A is destroyed. Can be raked. If the scraping mechanism 15 is intermittently driven, the storage A can be scraped down while reducing power consumption.

  The storage A that naturally falls out from the discharge port 14 is quantitatively transported by the screw-type transport mechanism 16 and is transferred to the transport path 21 via the discharge gate 18 installed in the path from the screw-type transport mechanism 16 to the transport path 21. Fall.

  The discharge gate 18 is provided with an electric damper, and is configured to switch the discharge and stop of the storage A from the storage tank 11 by opening and closing the electric damper by the control unit.

  Also in the conveyance path 21 shared by the silos 10A and 10B, a case conveyor or the like that conveys sludge that is granular material in the path by a plurality of plate-like bodies connected by a chain mechanism driven by a motor M. A transport mechanism is provided.

  The transport path 21 includes a path switching mechanism 23 that transports the storage A discharged from each discharge mechanism 20 or the sludge dropped from the chute 7 to the discharge path 22 outside the system. The route switching mechanism 23 will be described in detail later.

  The storage tank 11 and the input mechanism 13 are connected by a flexible joint, and the discharge gate 18 and the discharge path 17 are similarly connected by a flexible joint. Further, the storage tank 11 and the screw type transport mechanism 16 are connected via the discharge chute 14 a, and the terminal end of the screw type transport mechanism 16 is connected to the discharge gate 18.

  A weighing scale 19 is installed at the bottom of the storage tank 11. The total weight of the storage tank 11, the scraping mechanism 15, the discharge chute 14 a, the screw-type transport mechanism 16, the discharge gate 18, and the storage A stored in these is measured by the weight scale 19.

  By subtracting the respective weights of the known storage tank 11, scraping mechanism 15, discharge chute 14 a, screw type transport mechanism 16, and discharge gate 18 from the total weight measured by the weigh scale 19, the weight is stored in the storage tank 11. The weight of the stored A can be calculated.

  The control unit appropriately controls the input mechanism 13, the discharge mechanism 20, or the scraping mechanism 15 while grasping the storage amount of the storage material A stored in the storage tank 11.

  When the storage A is stored in the storage tank 11 for a long period of several tens of days or several months, the storage A solidifies inside the storage tank 11 to form a bridge, or the storage A becomes a wall surface or the like. There are various fluctuations in the properties of the stored matter A, such as sticking, moisture content distribution and temperature distribution, and gas generation accompanying chemical changes, making it difficult to store in an appropriate state. There is a fear.

  Therefore, in order to avoid the occurrence of such a problem, the processing facility 1 is further circulated to discharge the storage material from the storage tank 11 (11A, 11B) and input it again into the storage tank 11 (11A, 11B). A mechanism 24 is provided.

  The circulation mechanism 24 includes a circulation conveyance path 25 including a conveyance mechanism that conveys the storage discharged from the discharge mechanism 20 to the storage tank 11 via the input mechanism 13, and the storage A discharged from the discharge mechanism 20. Is switched to the discharge path 22 to the outside of the system or to the circulation transport path 25.

  The path switching mechanism 23 is configured by an electric damper. When the electric damper 23 is controlled to be opened by the control unit, the storage A on the conveyance path 21 is discharged from the discharge path 22, and when the electric damper 23 is controlled to be closed, the storage A on the conveyance path 21 is circulated and conveyed. It is conveyed to 25.

  That is, the circulation conveyance path 25 is configured by the conveyance path 21, the input path 5, and the horizontal conveyance path 6 described above, and is provided with a conveyance mechanism including the above-described case conveyor, that is, a circulation conveyance mechanism.

  According to such a circulation mechanism 24, the storage discharged from the discharge mechanism 20 is configured to be conveyed to the storage tank 11 via the input mechanism 13. There is no need to provide a discharge mechanism or a charging mechanism, and the equipment cost can be reduced. Moreover, since the conveyance path 21 reaching the path switching mechanism 23 can be shared as the circulation conveyance path 25, the equipment cost can be similarly reduced.

  In the present embodiment, the storage A is a granular material, and the discharge port 14 is formed so as to smoothly fall out of the discharge port 14 by its own weight. There is no need to provide a suction pump or the like.

  Further, since the storage A consolidated at the bottom of the storage tank 11 is discharged via the discharge mechanism 20 and is again input to the storage tank 11 via the input mechanism 13, the discharge path from the supply path of the storage A is discharged. It is possible to effectively avoid the occurrence of an inconvenient situation such as sticking by the storage A being unraveled in each of the routes leading to.

  The path switching mechanism 23 is configured by an electric damper. When the control unit 30 controls to open the electric damper, the storage A on the conveyance path 21 is discharged from the discharge path 22, and when the electric damper is controlled to close, the storage A on the conveyance path 21 is conveyed to the circulation conveyance path 25. Is done.

  The storage tanks 11A and 11B are juxtaposed, and the transport path 21 and the circulation transport path 25 can be shared so as to circulate and transport the stored matter A discharged from each discharge mechanism 20, so that the equipment cost can be suppressed. become able to.

  Further, the silo 10 is provided with a monitoring mechanism 26 that monitors fluctuations in the properties of the stored matter A in the storage tank 11.

  The properties of the storage A vary depending on various conditions such as the composition, storage amount, temperature, humidity, season, and storage period of the storage A. In addition, there are variations in the degree of fluctuations in the properties of the stored matter depending on various conditions such as temperature, humidity, season, and storage period. In particular, since the sludge stored at the bottom of the storage tank 11 is consolidated, if the humidity difference or temperature difference between the sludge on the top of the storage tank 11 increases, the property tends to fluctuate locally. . On the other hand, if the stored matter is circulated at all times, the change in properties may be promoted.

  Therefore, the monitoring mechanism 26 changes the property of the stored matter A stored in the storage tank 11 based on outputs of a plurality of temperature sensors, humidity sensors, gas sensors, and the like arranged in or near the storage tank 11. It is configured to monitor.

  For example, when the temperature of the storage A rises above a preset threshold, it can be determined that some exothermic reaction has occurred in the storage A, and the gas concentration of methane, carbon monoxide, or the like exceeds the preset threshold. Then, it can be judged that digestion reaction of organic matter has occurred. Furthermore, when a variation in humidity distribution is detected, it can be determined that crosslinking is likely to occur. In this way, the monitoring mechanism 26 detects signs of fluctuations in the properties of the stored matter A.

  The property of the storage A is monitored by the monitoring mechanism 26, and the storage A in the storage tank 11 is removed via the circulation mechanism 24 described above at a time when it is estimated that the property of the storage A is likely to fluctuate greatly. By discharging to the outside of the tank and throwing it back into the tank, the properties of the stored matter A can be homogenized, and large fluctuations in properties can be avoided and fluidity can be maintained. Furthermore, it becomes possible to avoid the sticking of the stored matter to the inner wall of the storage tank 11 and the occurrence of a bridge without providing a striking device. In addition, since the fluidity of the stored material can be maintained, it is possible to maintain the stored material falling out of the storage tank without using the scraping mechanism.For example, the frequency of using the scraping mechanism when discharging the stored material is reduced, which saves energy. Also become.

Based on FIG. 2, the control part which controls each part of the above-mentioned processing equipment 1 is demonstrated.
The control unit 30 includes a microcomputer, a memory that stores a program executed by the microcomputer, and the like. The control unit 30 includes an input control unit 31, a discharge control unit 32, an input unit 33, and a time measuring unit 34 that measures time. Has functional blocks.

  When detecting that the sludge has been input to the receiving hopper 3, the input control unit 31 drives the screw-type transfer mechanism 4 and drives the transfer mechanisms of the input path 5 and the horizontal transfer path 6 to store the empty space. The electric damper of the charging mechanism 13 corresponding to the tank 11 is opened, and charging control of the stored material A to the storage tank 11 is executed. When it is determined that the sludge filling is completed based on the measurement value of the weigh scale, the electric damper of the charging mechanism 13 is closed and each transport mechanism is stopped. In addition, when both of the pair of storage tanks 11 are initially empty, when the filling of the sludge into one storage tank 11 is completed, the other storage tank 11 is filled.

  When the discharge controller 32 detects that a discharge start switch (not shown) has been operated, the screw transport mechanism 16 is driven, the electric damper of the discharge gate 18 is opened, and the transport mechanism of the transport path 21 is further driven. In addition, the electric damper of the path switching mechanism 23 is switched so that the stored matter is discharged from the discharge path 22. When it is determined that all of the stored matter has been discharged based on the measurement value of the weigh scale, the electric damper of the discharge gate 18 is closed and each transport mechanism is stopped.

  The input unit 33 receives the measurement value of the weighing scale 19 and the monitor signal from the monitoring mechanism 26, and the input unit 33 inputs the input control unit 31 and the discharge control unit 32 based on the input signal values. Output a control signal.

  After the storage tank 11 is filled with sludge, the monitoring mechanism 26 is operated to monitor the change in properties of the stored matter A in the storage tank 11. When the input control unit 31 and the discharge control unit 32 determine that the property of the storage material has changed beyond a predetermined threshold based on the property of the storage material A monitored by the monitoring mechanism 26, the circulation control device 24 is activated. Circulate the reservoir.

  Specifically, the discharge mechanism 20 is controlled to discharge the storage A from the storage tank to the transport path 21 to drive the transport mechanism of the transport path 21, and the storage A transported through the transport path 21 is circulated and transported The path switching mechanism 23 is switched so as to be transported to the path 25, and the input path 5 and the horizontal transport path 6 are further driven to open the input mechanism 13.

  Such a circulation control of the storage is performed for each storage tank, and is continuously or intermittently executed only for the time required to circulate the entire storage filled in the storage tank 11.

  That is, a storage tank, an input mechanism that inputs the storage into the storage tank, a discharge mechanism that discharges the storage from the storage tank, and a circulation that discharges the storage from the storage tank and inputs it again into the storage tank The silo is equipped with a mechanism, and after the storage tank is filled with the storage from the charging mechanism, the discharge step is activated to discharge the storage out of the system, and the storage tank is filled Between the property detection step of detecting the property of the stored reservoir and the discharging step, the circulation mechanism is operated based on the fluctuation state of the property of the reservoir detected in the property detection step. A silo operating method for performing a circulation step to circulate is realized.

  The silo is operated in the discharge step by operating the discharge mechanism and the path switching mechanism to discharge the stored material to the discharge path outside the system, and in the circulation step, the discharge mechanism and the path switching mechanism are operated. Thus, the stored material is transported to the circulating transport path and circulated.

  When the circulation mechanism 24 is operated to circulate the storage A, the discharge amount of the storage A per unit time by the discharge mechanism 20 is smaller than that when the storage A is discharged out of the system, for example, half. Is set.

  For example, when the storage tank 11 has a storage capacity of about 50 t, if the discharge mechanism 20 is set so as to discharge the entire amount of the storage A in 90 minutes, the circulation mechanism 24 stores 180 minutes. It is set so that the whole amount of the object A is circulated.

  During circulation, it is preferable that the storage A is slowly discharged and re-introduced from the viewpoint that fluctuations in the properties of the storage A can be suppressed. Furthermore, the energy cost required to drive the screw type transport mechanism 16 of the discharge mechanism 20 can be reduced.

  The discharge control unit 32 controls the drive motor of the screw-type transport mechanism 16 with an inverter, reduces the rotation speed to halve the transport amount, or alternately drives the two screw-type transport mechanisms 16 to unit time. The discharge amount of the stored matter A discharged from the storage tank 11 is adjusted. That is, the discharge control unit 32 and the screw type transport mechanism 16 reduce the discharge amount per unit time of the storage A to the circulation transfer path 25 less than the discharge amount per unit time of the storage A to the discharge path 22. A discharge amount adjusting mechanism is configured.

  That is, according to the silo operation method, the discharge amount per unit time by the discharge mechanism when the circulation step is executed is smaller than the discharge amount per unit time by the discharge mechanism when the discharge step is executed. Is set to a value.

  As described above, not only when the path switching mechanism 23 is provided and the discharge mechanism 20 is used as a part of the circulation mechanism, but also when a dedicated discharge mechanism for circulation other than the discharge mechanism 20 is provided. In addition, the discharge amount per unit time by the dedicated discharge mechanism for circulation when the circulation step is executed is smaller than the discharge amount per unit time by the discharge mechanism 20 when the discharge step is executed. It is preferably set.

  Further, it is preferable that the scraping mechanism is operated at least when the circulation step is executed.

  In the above-described embodiment, the example in which the circulation step is executed when it is determined that the property of the stored material has changed beyond a predetermined threshold based on the monitor signal from the monitoring mechanism 26 has been described. The specific value of the threshold value is a value that is appropriately set based on the components of the stored matter and various environmental conditions, and is not particularly limited. Further, the monitoring mechanism 26 may be configured integrally with the control unit 30.

  When the monitoring mechanism 26 is not provided, a property detection step in which the operation manager visually measures the values of various sensors installed in the storage tank or the like and determines whether or not to execute the circulation step based on the results. May be executed. In this case, the control panel may be provided with an operation switch for manually starting the circulation step. Needless to say, the state of the operation switch is input to the control unit 30.

  When no sensor is installed in the storage tank or the like, the circulation mechanism 24 is turned on at a predetermined time after the storage tank 11 is filled with the storage A until the storage A is discharged from the discharge mechanism 20. What is necessary is just to comprise so that the circulation step may be performed by operating and operating the stored matter A.

  For example, the timer 34 provided in the control unit 30 measures the elapsed time after filling the storage, and continuously or intermittently so that the entire amount of the storage circulates once every several days, for example, every few days. It may be circulated. The execution interval of the circulation step may be set as appropriate within a time period in which the properties do not vary greatly depending on the composition of the storage, environmental conditions, and the like.

  In the embodiment described above, an example in which the sludge dehydrated sludge generated at the sewage treatment plant and dried and reused as fuel is used as the storage A is described. However, the silo storage A according to the present invention is like this. The dewatered sludge generated in the sewage treatment plant is not limited to the sludge, and the wet sludge that is temporarily stored before being reduced in volume in the incinerator or melting furnace is also used as the storage A Good.

  When wet sludge before incineration in an incinerator, for example, dehydrated sludge with a moisture content of about 80%, is stored in the storage tank, the sludge and moisture are separated in the storage tank, and water is contained in the lower and upper parts of the storage tank. The rate is biased and moisture collects at the bottom of the reservoir. In this way, the storage in the state where the sludge and the water are separated is uneven because the moisture content is uneven and the discharge amount is not stable, and even if such storage is transported to an incinerator, Stable incineration cannot be performed and processing efficiency decreases.

  Therefore, a moisture meter is installed as a monitoring mechanism for monitoring the fluctuation of the moisture content as the property of the stored substance in the piping on the discharge side of the supply pump that supplies the discharged substance from the storage tank to the incinerator. When the moisture content of the sludge discharged from the supply pump is higher than a predetermined value, the circulating material is circulated so that the stored matter is discharged from the storage tank and is put into the storage tank again. Thereby, the stored matter can be flowed inside the storage tank, and the property fluctuation of the stored matter can be suppressed and maintained uniformly.

  The storage tank is equipped with a moisture meter at the upper and lower parts, and the deviation of the moisture content of the dewatered sludge in the storage tank is detected from the difference between them, and the circulation mechanism is operated based on that to circulate the stored matter. May be.

  Further, the present invention is not limited to the dewatered sludge generated at the sewage treatment plant, but the dewatered sludge generated at the human waste treatment plant and the like may be used as the storage A.

  Further, it may be a case where waste materials for resource recycling such as waste paper and plastic are crushed by a crusher, and a granular material that can be reused for fuel or the like is used as the storage A. Such a storage A is cut out from a silo, quantitatively transported to a pellet mill by a screw-type transport mechanism, pressurized and processed into RPF (Refuse Paper and Plastic Fuel) that is a lump solid fuel, boiler, etc. It is used as an alternative fuel for fossil fuels in combustors.

  The above-described embodiment is one aspect of the present invention, and the present invention is not limited by the description. Specific configurations and control aspects of each part can be appropriately changed and designed within the scope of the effects of the present invention. Needless to say.

1: processing equipment 2: truck 3: receiving hopper 4: screw-type transport mechanism 5: loading path 6: horizontal transport path 7: chute 10 (10A, 10B): silo 11 (11A, 11B): storage tank 11a: bottom surface 13 (13A, 13B): input mechanism 14: discharge port 14a: discharge chute 15: scraping mechanism 15a: rotor 15b: scraping blade 16: screw type transport mechanism 17: discharge path 18: discharge gate 19: weighing scale 20: discharge Mechanism 21: Transport path 22: Discharge path 23: Path switching mechanism 24: Circulation mechanism 25: Circulation transport path 26: Monitoring mechanism 26a: Thermometer 26b: Gas detector 30: Control unit 31: Input control unit 32: Discharge control unit 33: Input unit 34: Timekeeping unit A: Storage

Claims (8)

A silo comprising a storage tank, a charging mechanism for charging the storage tank, and a discharge mechanism for discharging the storage from the storage tank,
A circulation mechanism that discharges the stored material from the storage tank and re-enters the storage tank; and a monitoring mechanism that monitors fluctuations in the properties of the storage material in the storage tank, and the circulation mechanism is monitored by the monitoring mechanism. A silo that is configured to operate based on the properties of the stored material. The circulation mechanism includes a circulation conveyance path including a conveyance mechanism for conveying the storage material discharged from the discharge mechanism to the storage tank via the input mechanism,
The silo according to claim 1, further comprising a path switching mechanism that switches between transferring the stored material discharged from the discharge mechanism to a discharge path to the outside of the system or transferring the stored material to the circulation transfer path.   The silo according to claim 2, further comprising a discharge amount adjusting mechanism for reducing a discharge amount per unit time of the storage material to the circulation conveyance path to be smaller than a discharge amount of the storage material to the discharge route per unit time.   A plurality of the storage tanks are arranged side by side, and the circulation transport path is shared so as to circulate and transport the storage material discharged from each discharge mechanism, and the storage material is transported from the circulation transport path to the input mechanism of each storage tank. The silo according to claim 2 or 3, wherein a horizontal conveyance path is connected, and a chute for dropping a stored substance is formed at an end of the horizontal conveyance path. A storage tank, an input mechanism that inputs the storage into the storage tank, a discharge mechanism that discharges the storage from the storage tank, and a circulation mechanism that discharges the storage from the storage tank and inputs it again into the storage tank. A silo driving method comprising:
A discharge step of operating the discharge mechanism to discharge the storage out of the system after the storage is input from the input mechanism to the storage tank;
A property detection step for detecting the property of the stored substance introduced into the storage tank;
A circulation step of operating the circulation mechanism based on the fluctuation state of the property of the storage detected in the property detection step to circulate the storage;
How to run the silo.   The amount of discharge per unit time of the storage by the discharge mechanism during execution of the circulation step is smaller than the amount of discharge per unit time of the storage by the discharge mechanism during execution of the discharge step. How to drive the silo. The silo is configured with a scraping mechanism that scrapes the accumulated matter accumulated at the bottom of the storage tank to the discharge port,
The silo operation method according to claim 5 or 6, wherein the scraping mechanism is operated at least when the circulation step is executed.   The silo operation method according to any one of claims 5 to 7, wherein the circulation step is executed when the property of the storage detected in the property detection step fluctuates beyond a predetermined threshold.

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