JP5968629B2 - Silo and silo operation method - Google Patents

Description

  The present invention includes a storage tank, a discharge port that is formed in the storage tank and allows the storage material to fall naturally from the storage tank, and a scraping mechanism that scrapes the storage material deposited on the bottom of the storage tank toward the discharge port. The present invention relates to a silo and a silo operation method.

Patent Document 1 discloses a silo using sludge as a storage object.
As shown in FIG. 6, the silo includes a 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 order to suppress power consumption required to drive the scraping device 3 constantly, a storage level detecting means for obtaining a storage level indicating the amount of the stored material 2 in height is provided, and the storage level is larger than a preset stop level. Furthermore, the operation of the scraping device 3 is stopped, and when the storage level becomes lower than the preset operation level, the scraping device 3 is driven. When the storage level is high, the torque for driving the blades 31 is increased and the power consumption is increased, so that the scraping device 3 is driven after the torque is reduced.

  According to Patent Document 1, an ultrasonic sensor 5 is used as a storage level detection unit, and an ultrasonic wave reflected from the upper surface of the reservoir 2 is measured to calculate a distance to the upper surface of the reservoir. In addition, a pressure sensor is used and the pressure applied to the bottom of the storage tank 1 is detected to estimate the storage level, or a weight sensor is used to detect the weight of the storage and the storage level is estimated.

Japanese Patent No. 3874349

  The above-described prior art is intended to suppress the power consumption required for the scraping device 3, and the storage material stably drops from the discharge port until the scraping device 3 is operated. It is assumed to be.

  However, depending on the properties of the stored matter, there is a problem that the stored matter in the storage tank may not stably fall out from the discharge port unless the scraping device 3 is operated. For example, if the storage is consolidated in the storage tank and partially solidified, arching or bridges occur, a rat hole is generated in the center, and further, if the storage adheres to the wall, the scraping device There was a possibility that the stored material would not fall stably from the outlet until the operation No. 3 was started.

  Therefore, it is conceivable to determine whether or not such a state has occurred based on the level detected by the storage level detection means, but the conditions for the occurrence of bridges and the like are not constant, and the properties of the storage at that time There are various problems depending on the storage conditions such as temperature, humidity, storage period, etc., and there is a problem that the determination cannot be made uniformly at the storage level.

  In view of the above-described problems, an object of the present invention is a silo and a silo capable of stably dropping out the storage by appropriately determining the occurrence of a bridge and the like without being affected by the storage conditions of the storage. The point is to provide a driving method.

In order to achieve the above-mentioned object, the first characteristic configuration of the silo according to the present invention is a storage tank and a storage tank formed in the storage tank and stored from within the storage tank as described in claim 1 of the claims. A discharge port for naturally dropping sludge as a waste, a rotating scraping blade, and rotating the scraping blade in one direction to scrape the deposit accumulated at the bottom of the storage tank in the direction of the discharge port. A silo equipped with a scraping mechanism, and the amount of discharge per unit time of the storage that falls naturally from the discharge port regardless of the amount of storage of the storage stored in the storage tank is the first. When the threshold is below the threshold, the scraping mechanism is driven to scrape the deposit accumulated in the bottom of the storage tank in the direction of the discharge port. This is in that a control unit is provided.

  Regardless of the remaining amount of the reservoir stored in the storage tank, whether or not it has fallen stably from the outlet by measuring the discharge amount per unit time of the deposit that falls naturally from the outlet Can be determined. When the amount of discharge per unit time decreases, it is determined that arching or bridging occurs in the reservoir for some reason, a rat hole is generated in the center, or the reservoir is adhering to the wall and solidifying. . In addition, if the remaining amount of the reservoir is reduced, it will be difficult to naturally fall out from the outlet as a result of depositing around the outlet at an angle of repose unique to the reservoir. The amount of emissions decreases.

  Therefore, regardless of the storage conditions such as the properties, temperature, humidity, storage period, etc. of the storage, the control unit sets the discharge amount per unit time of the storage that falls naturally from the discharge port and the preset first threshold value. By comparing, it becomes possible to appropriately determine whether or not the stored matter has fallen naturally from the discharge port, and when the discharge amount per unit time becomes less than the first threshold value, the scraping mechanism is driven. Thus, the stored matter is forcibly dropped from the outlet.

  Driven by the scraping mechanism, the accumulation accumulated at the bottom of the storage tank is raked in the direction of the discharge port, and this causes the arching, bridge, etc. generated in the storage to collapse. Comes out naturally. The measurement time for calculating the discharge amount per unit time, the measurement interval, the value of the first threshold value, and the like are not particularly limited, and are values appropriately set by experiments or the like. For example, by measuring the weight of a reservoir that has fallen naturally in tens of seconds at an interval of several minutes, the amount of discharge per unit time is calculated, and the value is less than 50% of the average dropout amount. Sometimes the scraping mechanism can be driven.

  As described in claim 2, the second characteristic configuration is that, in addition to the first characteristic configuration described above, a plurality of the discharge ports are formed at the bottom of the storage tank.

  In the third feature configuration, as described in the third aspect, in addition to the first or second feature configuration described above, the control unit measures the weight of the entire storage in the storage tank. The output value is sampled, and the discharge amount is calculated based on the output value.

  The weight measured by the weighing scale is a weight obtained by adding the weight of the storage tank and the remaining amount of the storage in the storage tank. Therefore, for example, if the difference between the weights of the storage tanks measured before and after the lapse of a predetermined time is divided by the predetermined time, it is possible to easily calculate the discharge amount per unit time of the storage that naturally falls from the discharge port. it can. In addition, when a weighing scale that measures the weight of the storage tank is installed to grasp the remaining amount of storage in the storage tank and whether or not all of the storage has been discharged, Since the measured value of the weighing scale can be used to calculate the discharge amount per unit time of the fallen storage material, there is a good point that it is not necessary to install a separate weighing scale. By stopping the charging of the stored material and performing batch processing, the discharge amount per unit time can be accurately calculated.

  In the fourth feature configuration, as described in claim 4, in addition to the first or second feature configuration described above, the control unit measures the discharge amount of the storage material that has fallen naturally from the discharge port. The output value of the discharge amount detecting means is sampled, and the discharge amount is calculated based on the output value.

  The discharge detection means detects the weight of the storage that falls naturally from the outlet, or the level meter that measures the storage height of the storage in the storage tank, or the pressure applied to the bottom of the storage tank It consists of a pressure gauge. As a discharge detection means, for example, a weight scale is adopted, and the weight of the reservoir that falls naturally before and after the lapse of a predetermined time is sampled, and the difference is calculated and divided by the predetermined time. Emissions can be calculated.

  If a double damper mechanism is provided in the storage route of the stored material from the discharge port, the weight of the storage material that has fallen naturally until the operation of the double damper mechanism can be measured in a batch. Since a small and highly accurate weighing scale that measures a lightweight object can be used rather than a weighing scale that measures the weight of the entire storage tank, which is a heavy object, there is a merit that measurement accuracy can be improved. Even if the storage is continuously charged, the discharge amount per unit time can be accurately calculated.

  In the fifth feature configuration, in addition to any one of the first to fourth feature configurations described above, the control unit is configured such that the discharge amount is a value greater than the first threshold value. The scratching mechanism is stopped when the second threshold value is set to be equal to or greater than the second threshold value.

  When the discharge amount per unit time of the storage that falls naturally from the discharge port becomes equal to or less than the first threshold value and the scraping mechanism is driven, and the discharge amount becomes equal to or greater than the second threshold value that is greater than the first threshold value, the control unit It is also possible to suppress wasteful power consumption required for the scraping mechanism by determining that the natural drop of the stored matter is sufficiently promoted by the scraping mechanism and stopping the scraping mechanism. If the discharge amount becomes equal to or smaller than the first threshold value again after that, the control unit drives the scraping mechanism again to scrape the accumulated matter accumulated on the bottom toward the discharge port.

  According to the sixth feature configuration, in addition to any of the first to fourth feature configurations described above, the control unit drives the scraping mechanism and then stores the storage. The scraping mechanism is continuously or intermittently driven until the discharge of the stored matter in the tank is completed.

  Once the discharge amount falls below the first threshold and the scraping mechanism is driven, the control unit constantly drives the scraping mechanism until the discharge of the stored matter in the storage tank is completed. The storage can be dropped from the outlet. Further, by intermittently driving, the stored material can be stably dropped from the outlet while reducing power consumption.

  In addition to any one of the first to sixth characteristic configurations described above, the seventh characteristic configuration is the storage tank so as to cross the discharge port. A scraping member that moves along the bottom surface of the discharge port, and a maximum area of a portion where the scraping member overlaps the discharge port in a plan view is set to 60% or less of an opening area of the discharge port. .

  If the scraping member overlaps with the discharge port and stops, the opening area of the discharge port may become small and the natural dropout of the stored matter may be hindered, so install a sensor to detect the position of the scratching member. A need arises to control the stop position of the scraping member. However, if the maximum area of the part where the scraping member overlaps with the discharge port in plan view is set to 60% or less of the opening area of the discharge port, even if the scraping member stops in a state of being completely overlapped with the discharge port, Because it has been confirmed that there is no obstacle to measuring the amount of discharge per unit time of the storage that naturally falls from the outlet, and that there is no effect on the natural fall of the storage from the outlet. is there. This eliminates the need for a separate sensor for controlling the stop position of the scraping member.

The first characteristic configuration of the silo operation method according to the present invention includes a storage tank and a discharge port that is formed in the storage tank and naturally discharges sludge that is stored in the storage tank. And a scraping blade that is rotationally driven, and a scraping mechanism that rotates the scraping blade in one direction to scrape the accumulated matter accumulated at the bottom of the storage tank toward the discharge port. A discharge step for naturally dropping the storage from the discharge port in a state where the scraping mechanism is stopped; and a discharge amount detecting step for detecting a discharge amount of the storage naturally dropped from the discharge port; A discharge amount calculating step for calculating a discharge amount per unit time of the storage that naturally falls from the discharge port based on the discharge amount of the storage detected in the discharge amount detection step; and the discharge amount calculation step And the emission amount calculated in If it is determined that the discharge amount is equal to or less than a first threshold value in the comparison step regardless of the amount of storage of the stored product stored in the storage tank, A scraping step that causes the stored matter accumulated at the bottom of the storage tank by driving to scrape in the direction of the discharge port, and causes the arching or bridge generated in the stored material to break down when triggered by this. It is in.

  According to the second feature configuration, in addition to the first feature configuration described above, the discharge amount is set to a value larger than the first threshold after the scraping step. If it is determined that the threshold is greater than or equal to two thresholds, a stop step for stopping the scraping mechanism is provided.

  In the third feature configuration, in addition to the first or second feature configuration described above, after the execution of the scraping step, it is determined that the storage in the storage tank has become empty. Then, there is a discharge end step for stopping the scraping mechanism.

  As described above, according to the present invention, a silo and a silo operating method that can appropriately determine the occurrence of a bridge and the like and stably drop the storage without being affected by the storage conditions of the storage. Can now be provided.

Illustration of silo (A) is a plan view of the scraping device provided on the bottom of the silo, (b) is a cross-sectional side view of the same Illustration of control device (A) is a flowchart of control by a control part, (b) is a flowchart of calculation control of discharge amount. Illustration of emissions calculation Illustration of a conventional silo

  Hereinafter, a silo and a silo operation method according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the silo 10 includes a storage tank 11 having a cylindrical side wall, an input mechanism 13 that inputs the storage A into the storage tank 11, and a discharge port 14 formed in the bottom surface 11 a of the storage tank 11. And a scraping mechanism 15.

  The storage A carried in from the carry-in path 12 is input to the storage tank 11 via the input mechanism 13, and the storage A accumulated in the storage tank 11 naturally falls out of the tank via the discharge port 14. It is configured.

  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. Such a storage A is stored in the storage tank 11 for a period of time, and after component analysis, if it is within a certain allowable range, it is discharged from the storage tank 11 to be reused as fuel. It is carried out.

  The storage A that naturally falls out from the discharge port 14 is sent to the screw conveyor mechanism 16 via the discharge chute 14 a, and the storage A that is conveyed by the screw conveyor mechanism 16 passes through the discharge gate 18 to the discharge path 17. Discharged.

  The scraping mechanism 15 includes a scraping blade 15b as a scraping member that scrapes the storage A deposited on the bottom surface 11a of the storage tank 11 in the direction of the discharge port 14.

  A case conveyor mechanism is installed in the conveyance path 12, and the stored material A that is carried in from the processing equipment on the upstream side of the silo 10 is conveyed to the storage tank 11.

  The charging mechanism 13 is provided with an electric damper 13a, and the electric damper 13a is opened and closed, whereby the storage A transferred through the transfer path 12 is input to or stopped from the storage tank 11.

  As shown in FIGS. 2 (a) and 2 (b), the scraping mechanism 15 is arranged to extend in the radial direction around the rotation axis P of the rotor 15a and the rotor 15a driven by a hydraulic motor or an electric motor. A pair of scraping blades 15b are provided. The scraping blades 15b are not limited to two but may be one or a plurality of three or more.

  The discharge port 14 is a position shifted in the circumferential direction from the central portion of the bottom surface 11a of the storage tank 11, and is formed at two locations that are symmetrical with respect to the center of the bottom surface 11a. 14 is set to 70% or less, preferably 60% or less, of the opening area of the discharge port 14. Note that the lower limit value of the overlapping area between the scraping blade 15b and the opening of the discharge port 14 is not particularly limited as long as the mechanical strength of the scraping blade 15b can be secured.

  When the rotor 15 a is driven, the scraping blade 15 b of the scraping mechanism 15 rotates around the rotation axis P along the bottom surface 11 a of the storage tank 11 so as to cross the discharge port 14, and accumulates at the bottom of the storage tank 11. The collected storage material is scraped toward the discharge port 14 and falls naturally from the discharge port 14.

  The discharge gate 18 is composed of an electric damper 18a. By opening and closing the electric damper 18 a, the stored material A conveyed by the screw conveyor mechanism 16 is discharged to the discharge path 17.

  The silo 10 is provided with a control unit 20, and performs the above-described opening / closing control of the electric dampers 13a, 18a, driving of the scraping mechanism 15, and the like.

  A storage such as sludge stored in the storage tank 11 is gradually consolidated by its own weight or a drop impact at the time of charging, and the aggregate has a certain level of strength. When the strength of the aggregate exceeds the shear force generated by the silo shape and the friction between the inner wall and the reservoir, arching or bridging occurs, or a rat hole occurs in the center. The stored matter adheres to the wall surface and remains, and the stored matter is unlikely to fall out naturally from the outlet 14 at the bottom of the storage tank 11.

  Even in such a case, the control unit performs control so that the stored matter naturally falls from the discharge port 14 stably.

  In addition, even if the stored matter A stored in the silo 10 falls naturally from the discharge port 14, it remains on the discharge chute 14a and is not discharged outside the system until the screw conveyor mechanism 16 is driven.

  A weighing scale 19 for measuring the weight of the storage tank 11 is provided at the bottom of the storage tank 11. In addition, the storage tank 11 and the charging mechanism 13, and the discharge gate 18 and the discharge path 17 are connected by a flexible joint. On the other hand, the storage tank 11 and the screw conveyor mechanism 16 are connected by a discharge chute 14a, and the screw conveyor mechanism 16 and the discharge gate 18 are connected.

  That is, the storage tank 11, the scraping mechanism 15, the discharge chute 14 a, the screw conveyor mechanism 16, the discharge gate 18, and the storage tank 11, the scraping mechanism 15, the discharge chute 14 a, the screw conveyor mechanism 16, the discharge gate are measured by the weighing scale 19. The weight of the stored material A stored in 18 will be measured, but the absolute value of the difference between the weight measured at a certain time and the weight measured after a predetermined time has elapsed is divided by the elapsed time. Thus, the discharge amount of the storage A per unit time can be calculated.

  In addition, by previously measuring the weight of the storage tank 11, the scraping mechanism 15, the discharge chute 14a, the screw conveyor mechanism 16, and the discharge gate 18, the weight of the stored storage A can be calculated, By grasping the storage amount, adjustment of the remaining amount and discharge amount of the storage A in the silo, the opening / closing control timing of the input mechanism 13, the incineration facility and melting of the storage A installed downstream of the discharge path 17 Equipment can be controlled appropriately.

Next, the control unit 20 will be described with reference to FIGS. 3 and 4A and 4B.
The control unit 20 is input to the timing unit 22 that measures the elapsed time, the input unit 23 that receives the output value of the weight of the storage tank 11 measured by the weight meter 19, and the timing unit 22 and the input unit 23. Based on the weight value, the calculation unit 24 that calculates the discharge amount per unit time of the storage A that naturally falls from the discharge port 14, the discharge amount Qx calculated by the calculation unit 24, and the results obtained in advance through experiments The storage unit 25 that stores the first threshold Th1 set based on the above, the comparison unit 26 that compares the discharge amount Qx with the first threshold Th1, the drive and stop of the screw conveyor mechanism 16, and the opening and closing of the discharge gate 18 In addition, a drive control unit 21 that drives and stops the scraping mechanism 15 based on the result of the comparison unit 26 is provided.

  The drive control unit 21 drives the screw conveyor mechanism 16 after opening the discharge gate 18 in a state where the scraping mechanism 15 is stopped (SA1: Y), and the storage A that has fallen naturally from the discharge port 14 is removed. A discharge step (SA2) for discharging to the transport path 17 is executed.

  The weight scale 19 and the input unit 23 execute a weight detection step of detecting the weight of the storage A that naturally falls out from the discharge port 14.

  The calculation unit 24 calculates the discharge amount Qx per unit time of the storage A that drops out of the storage A from the discharge port 14 based on the weight of the storage A detected in the time measuring unit 22 and the weight detection step. A discharge amount calculation step (SA4) is executed.

  The comparison unit 25 executes a comparison step (SA5) for comparing the discharge amount Qx calculated in the discharge amount calculation step with a preset first threshold value Th1.

  When the drive control unit 21 determines in the comparison step that the discharge amount Qx is equal to or less than the first threshold value Th1 (SA5: Y), a scraping step (SA6) for driving the scraping mechanism 15 and a scraping step (SA6). After executing the above, a detection step (SA7) for detecting the empty of the storage A in the storage tank 11 is executed, and if the empty of the storage A is detected in the detection step (SA7: Y), the scraping mechanism 15 is stopped. A discharge end step (SA9) is executed.

  In the detection step (SA7), it may be detected that the storage A has become empty based on the measurement value of the weighing scale 19, or the current voltage of the hydraulic motor or the electric motor of the rotor 15a of the scraping mechanism 15 is detected. Monitoring may calculate the torque of the scraping blade 15b to detect that the storage A has become empty.

  Immediately after the discharge of the storage A in the storage tank 11 is started, the storage A that has naturally fallen from the discharge port 14 is conveyed by the screw conveyor mechanism 16 and passes through the discharge gate 18 to reduce the weight of the storage tank 11. Since there is a time lag before starting, a discharge amount calculating step (SA4) is executed after a predetermined delay time has elapsed (SA3). Thus, the scraping mechanism 15 is prevented from being driven because the discharge amount Qx is equal to or less than the first threshold Th1 at the start of discharging the stored matter A.

  The discharge amount calculation step (SA4) of the discharge amount per unit time of the storage A that naturally falls from the discharge port 14 by the calculation unit 24 will be described.

  As shown in FIG. 5, the weight 19 input to the input unit 23 at a certain time t1 is w1, and the weight 19 input to the input unit 23 at a time t2 after a predetermined time has elapsed. Assuming that the output value is w2, the emission amount Qx can be calculated by the following equation. Qx = (w1-w2) / (t2-t1)

  That is, the change (w1-w2) in the weight of the storage tank 11 when the time (t2-t1) has elapsed is the discharge amount Qx of the stored matter A discharged from the storage tank 11.

  Thus, in this embodiment, the calculation part 24 calculates the discharge amount Qx of the stored matter A indirectly by measuring the weight of the storage tank 11.

  In the weight detection step executed by the calculation unit 24, the timing for sampling the weight may be set as appropriate according to the capacity of the storage tank 11, the discharge amount Qx of the storage A, and the processing capacity of the subsequent processing equipment. In addition, when the input of the storage A to the storage tank 11 is batch-processed, the weight of the storage A is sampled while the input of the storage A is stopped, but the input of the storage A is continuous. If this is done, weight sampling is not performed.

  As shown in FIG. 4B, the weight detection step includes, for example, a time of 3 to 5 minutes (SB2: Y) after the first weight detection (SB1), and the second weight detection. (SB3) and the discharge amount is calculated (SB4). After an interval of about 30 seconds from the second weight detection (SB5: Y), the first weight for calculating the next discharge amount is detected (SB1).

  Here, when the storage A is sufficiently stored in the storage tank 11 and the storage A is naturally falling from the discharge port 14 by its own weight, the unit time of the storage A that naturally falls from the discharge port 14 When the winning discharge amount Qx is a steady discharge amount, the first threshold Th1 is set to, for example, 50% of the steady discharge amount. When the amount of emissions Qx at a certain time becomes 50% or less, it can be judged that the amount of storage is reduced and it is difficult to fall out naturally due to its own weight, or it is difficult to fall out naturally due to the occurrence of bridges etc. .

  The comparison unit 26 compares the calculated discharge amount Qx with the first threshold Th1 stored in the storage unit 25. If Qx> Th1, it can be determined that the storage A has fallen naturally without any delay, and therefore the scraping mechanism 15 does not need to be driven. On the other hand, if Qx ≦ Th1, it can be determined that the scraping mechanism 15 needs to be driven because the discharge amount of the stored material A has decreased.

  The drive control unit 21 drives the scraping mechanism 15 based on the comparison result of the comparison unit 26 if Qx ≦ Th1.

  As described above, the control unit 20 sets the discharge amount Qx per unit time of the storage A that naturally falls out from the discharge port 14 below the preset first threshold Th1 regardless of the amount of the storage A stored. Then, the scraping mechanism 15 is driven so that the arching, the bridge, the rat hole, and the wall surface adhesion of the storage A can be broken down, and when the storage amount decreases, the discharge angle around the outlet 14 is reduced at a predetermined angle of repose. The accumulation A to be accumulated can be scraped in the direction of the discharge port and fall out naturally.

  In addition, when the scraping blade 15b is overlapped with the discharge port 14 and stopped in a plan view, the opening area through which the storage A can pass is narrowed, but the portion where the scraping blade 15b overlaps with the discharge port 14 is reduced. If the maximum area is set to 70% or less, preferably 60% or less of the opening area of the discharge port 14, even if the scraping blade 15 b is stopped in a state where it overlaps with the discharge port 14, the storage naturally falls from the discharge port. There are no obstacles to measuring the amount of discharge per unit time, and there is no effect on the natural drop of storage from the outlet. Therefore, since it is not necessary to provide a sensor for detecting the position of the scraping blade 15b and a control mechanism for controlling the stop position, the control unit 20 can be configured simply and inexpensively.

  Note that the first threshold Th1 is not limited to 50% of the steady discharge amount Q, and may be set as appropriate according to the conditions such as the properties of the stored matter A and the storage environment. Further, the first threshold Th1 is not the steady discharge amount Q, but the weight of the reservoir A that naturally falls out from the discharge port 14 is sampled over time, and the weight sampled this time is the weight at the previous sampling time, or Alternatively, it may be set such that it is 50% or less of the average value of the weights sampled up to the previous time.

  The controller 20 drives the scraping mechanism 15 continuously after driving the scraping mechanism 15 until the discharge of the stored matter A in the storage tank 11 is completed. Thereby, the stored matter A can be scraped reliably at the bottom of the storage tank 11.

  Since the weight of the storage A can be calculated by measuring the weight of the storage tank 11, the scraping mechanism 15, the discharge chute 14a, the screw conveyor mechanism 16, and the discharge gate 18 in advance, the storage A in the storage tank 11 can be calculated. The completion of discharge can be grasped.

  From the configuration described above, in a state in which the scraping mechanism 15 is stopped, a discharge step for dropping the storage A from the discharge port 14, a weight detection step for detecting the weight of the storage A falling from the discharge port 14, A discharge amount calculating step for calculating a discharge amount Qx per unit time of the storage A dropping the storage A from the discharge port 14 based on the weight of the storage A detected in the weight detection step, and a discharge amount calculation If the comparison step of comparing the discharge amount Qx calculated in the step with the preset first threshold value Th1 and the comparison step determines that the discharge amount Qx is equal to or less than the first threshold value Th1, the scraping mechanism 15 is driven. If it is determined that the storage A in the storage tank 11 has become empty after execution of the scraping step and the scraping step, an operation method of the silo 10 including a discharge end step for stopping the scraping mechanism 15 is realized. That.

  Therefore, it is possible to provide a silo and a silo operation method that can stably fall out the storage without being affected by the storage condition of the storage.

Hereinafter, another embodiment of the silo and the silo operation method according to the present invention will be described.
In the above-described embodiment, the control unit 20 continuously drives the scraping mechanism 15 until the scraping mechanism 15 is temporarily discharged after the scraping mechanism 15 is once driven. However, it may be configured to drive intermittently. By driving intermittently, the stored material A can be scraped while reducing power consumption.

  Further, the control unit 20 may stop the scraping mechanism 15 when the discharge amount Qx becomes equal to or larger than the second threshold Th2 set to a value larger than the first threshold Th1.

  As shown in FIG. 4A, after executing the scraping step (SA6), if it is determined that the discharge amount Qx is equal to or larger than the second threshold Th2 set to a value larger than the first threshold Th1 (SA10: Y). Then, a stop step for stopping the scraping mechanism 15 is executed (SA11).

  When the discharge amount Qx becomes equal to or less than the first threshold Th1 and the control unit 20 drives the scraping mechanism 15, for example, when the discharge amount Qx becomes equal to or more than the second threshold Th2 set to 80% of the steady discharge amount Q, Since it is considered that the dropout of the stored material A is sufficiently promoted by the feeding mechanism 15, power consumption can be reduced by stopping the scraping mechanism 15. Thereafter, when the discharge amount Qx becomes equal to or less than the first threshold value Th1, the control unit 20 drives the scraping mechanism 15 again to scrape the accumulation A accumulated on the bottom toward the discharge port 14.

  In addition, what is necessary is just to set a 2nd threshold value suitably according to each conditions, such as not only 80% of the said regular discharge | emission amount but the property of the stored matter A, a storage environment.

  In the embodiment described above, the weighing scale 19 includes the storage tank 11, the scraping mechanism 15, the discharge chute 14a, the screw conveyor mechanism 16, the discharge gate 18, the storage tank 11, the scraping mechanism 15, the discharge chute 14a, and the screw conveyor mechanism. 16, although the structure which calculates discharge | emission amount based on the total weight of the stored matter A stored in the discharge gate 18 was demonstrated, it does not restrict to this.

  As a discharge amount detecting means for measuring the discharge amount of the storage A that naturally falls from the discharge port 14, a weigh scale that detects the weight of the storage A that naturally falls from the discharge port, or the storage A in the storage tank 11. Provided with a level meter for measuring the storage height of the storage tank or a pressure gauge for detecting the pressure applied to the bottom of the storage tank 11, sampling the output value of the discharge amount detection means, and calculating the discharge amount Qx based on the output value You may comprise.

  When a weigh scale is used as the discharge amount detecting means, for example, a weight scale is installed at the discharge gate 18 in the discharge path on the downstream side of the discharge port 14, and the natural drop from the discharge port 14 before and after a predetermined time elapses. The weight of the storage A that is taken out and deposited on the discharge gate 18 is measured.

  The control unit 20 measures the weight of the storage A that naturally falls from the discharge port 14 from a certain time to a predetermined time, so that the storage A that falls naturally from the discharge port 14 per unit time is measured. A discharge amount Qx can be calculated.

  In addition, when a double damper mechanism is provided in the drop path of the stored material A from the discharge port 14, the weight of the stored material A that has fallen naturally until the double damper mechanism is actuated in batches. Can do.

  In the case of a configuration that measures from the difference in weight of the entire storage tank 11, it is necessary to use a large scale that can measure heavy objects and has a high resolution. In the case of a configuration that measures the weight, it is only necessary to use a small scale that can measure the storage A that has fallen naturally per unit time, so accurate measurement is possible while reducing the cost of the scale itself. It becomes.

  Moreover, in the case of the configuration that is measured from the difference in the weight of the entire storage tank 11, the actual discharge amount is not reduced when a new storage is added to the storage tank 11 during the discharge of the storage A. However, the discharge amount Qx calculated from the weight of the storage tank 11 may be equal to or less than the first threshold Th1. In this case, the scraping mechanism 15 is unnecessarily driven. However, since the actual discharge amount can be calculated by measuring the weight of the storage material actually discharged from the discharge gate 18, the scraping mechanism 15 can be driven without waste. Even if the storage is continuously charged, the discharge amount per unit time can be accurately calculated.

  In the above-described embodiment, the flat scraping blade 15b as a scraping member is in the vicinity of the bottom surface 11a of the storage tank 11, and is arranged to extend radially around the rotation axis P of the rotor 15a. Although demonstrated, the structure of a scraping member is not restricted to this. A configuration in which a plurality of scraping blades 15b are arranged to extend in the height direction of the rotor 15a may be employed. Further, the scraping blade 15b may be disposed at an appropriate angle with respect to the rotational axis P of the rotor 15a like a screw. The shape of the scraping blade 15b is not limited to a flat plate shape, and may be a twisted shape, a shape having a different width along the circumferential direction, or a prismatic shape.

  By adopting an appropriate structure of the scraping member according to the properties of the storage A, the arching, the bridge, the rat hole, and the wall surface adhesion of the storage A can be more efficiently broken down and naturally dropped.

  In embodiment mentioned above, although the discharge port 14 demonstrated the structure formed in two places of the bottom face 11a of the storage tank 11, the number of discharge ports is not restricted to this, A single may be sufficient and it is three or more places. There may be a plurality.

  In addition, the discharge port is not limited to being formed on the bottom surface 11a of the storage tank 11, but is configured to be formed on the side wall of the storage tank 11, or has a structure formed on each of the side wall and the bottom surface 11a. The structure formed in the area | region from the bottom face 11a of the tank 11 to a lower part of a side wall may be sufficient.

  In any case, a discharge chute 14a, a screw conveyor mechanism 16 and a discharge gate 18 may be provided on the downstream side of the discharge port so as to guide the storage A that has naturally dropped from the discharge port to the discharge path 17.

  In the above-described embodiment, an example in which dewatered sludge generated in a sewage treatment plant and dried and reused as fuel is used as the storage is described. However, the storage of the silo according to the present invention is such sludge. It is not limited to the above, but it is a case where dewatered sludge generated at a sewage treatment plant is used as a storage, which is temporarily stored before being reduced in volume in an incinerator or melting furnace. May be. Further, the present invention is not limited to the dewatered sludge generated at the sewage treatment plant, but may be a case where sludge generated at the human waste treatment plant and dehydrated is used as a storage.

  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 a storage. Such storage is cut out from the silo, transported to a pellet mill by a screw conveyor mechanism, pressurized and processed into RPF (Refuse Paper and Plastic Fuel), which is a bulk solid fuel, and burned in boilers, etc. Used as a substitute for fossil fuels.

  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.

10: Silo 11: Storage tank 11a: Bottom surface 12: Loading path 13: Loading mechanism 13a: Electric damper 14: Discharge port 14a: Discharge chute 15: Scavenging mechanism 15a: Rotor 15b: Scrape blade 16: Screw conveyor mechanism 17: Discharge path 18: Discharge gate 19: Weigh scale 20: Control unit 21: Drive control unit 22: Timing unit 23: Input unit 24: Calculation unit 25: Storage unit 26: Comparison unit A: Storage Qx: Discharge amount Th1: No. One threshold Th2: second threshold

Claims (10)

A storage tank, a discharge port that is formed in the storage tank and allows the sludge that is stored to fall out of the storage tank, a scraping blade that is driven to rotate, and the scraping blade that rotates in one direction A silo equipped with a scraping mechanism for scraping the accumulated matter accumulated at the bottom of the storage tank toward the discharge port,
By driving the scraping mechanism when the discharge amount per unit time of the storage that naturally falls out from the discharge port is equal to or less than the first threshold regardless of the amount of the storage stored in the storage tank A silo provided with a control unit that scrapes the accumulated matter accumulated in the bottom of the reservoir in the direction of the discharge port and causes the arching, bridge, etc. generated in the accumulated item to break down when triggered by this.   The silo according to claim 1, wherein a plurality of the discharge ports are formed at the bottom of the storage tank.   The silo according to claim 1 or 2, wherein the control unit samples an output value of a weigh scale that measures the weight of the entire stored matter in the storage tank, and calculates the discharge amount based on the output value.   The said control part samples the output value of the discharge | emission amount detection means which measures the discharge | emission amount of the storage material which fell naturally from the said discharge port, and calculates the said discharge | emission amount based on the said output value. Silos.   The silo according to any one of claims 1 to 4, wherein the control unit stops the scraping mechanism when the discharge amount becomes equal to or greater than a second threshold value set to a value larger than the first threshold value.   5. The controller according to claim 1, wherein the controller drives the scraping mechanism continuously or intermittently after driving the scraping mechanism until the discharge of the storage in the storage tank is completed. The silo described in.   The scraping mechanism includes a scraping member that moves along the bottom surface of the storage tank so as to cross the discharge port, and a maximum area of a portion where the scraping member overlaps the discharge port in a plan view is the discharge area. The silo according to any one of claims 1 to 6, wherein the silo is set to 60% or less of the opening area of the outlet. A storage tank, a discharge port that is formed in the storage tank and allows the sludge that is stored to fall out of the storage tank, a scraping blade that is driven to rotate, and the scraping blade that rotates in one direction A silo operation method comprising a scraping mechanism that scrapes the accumulated matter accumulated at the bottom of the storage tank toward the discharge port,
A discharging step for naturally dropping the stored matter from the discharge port in a state where the scraping mechanism is stopped;
A discharge amount detecting step for detecting a discharge amount of the storage material naturally falling from the discharge port;
Based on the discharge amount of the storage detected in the discharge amount detection step, the discharge amount calculation step of calculating the discharge amount per unit time of the storage that falls naturally from the discharge port;
A comparison step of comparing the discharge amount calculated in the discharge amount calculation step with a first threshold;
If it is determined in the comparison step that the discharge amount is equal to or less than a first threshold regardless of the amount of the storage stored in the storage tank, the scraping mechanism is driven to deposit on the bottom of the storage tank. Scraping the collected storage in the direction of the discharge port, and using this as a trigger, the arching and the bridge generated in the storage are broken down,
Silo driving method including.   9. The method according to claim 8, further comprising a stop step of stopping the scraping mechanism when it is determined that the discharge amount is equal to or greater than a second threshold value set to a value larger than the first threshold value after the scraping step. How to drive a silo. The silo operation method according to claim 8 or 9, further comprising a discharge end step of stopping the scraping mechanism when it is determined that the storage in the storage tank has become empty after execution of the scraping step.

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