JP5940442B2 - Pumping sand facility and operation method thereof - Google Patents

Description

  The present invention relates to a sand raising facility and an operation method thereof.

  2. Description of the Related Art Conventionally, there is known a sand pumping facility that discharges sand collected in a sand collecting pit of a sand basin in a sewage treatment plant or the like through a sand pumping pipe using a jet pump. In such a sand pumping facility, when the amount of sediment deposited in the sand collection pit is too large or when the flow of sediment is poor, the suction pipe of the jet pump cannot absorb the sediment and the suction pipe of the jet pump is blocked. It may become. In this case, the backwashing process is performed by causing the pressurized water that drives the jet pump to flow back into the suction pipe, thereby improving the fluidity of the sand settling near the suction port of the suction pipe and eliminating the blockage state. If the flowability of the sedimentation does not improve even if the backwash treatment is performed, for example, as described in Patent Document 1, the mixed fluid of the sedimentation sand and water sucked from the suction pipe is collected from the path branched from the sand lifting pipe. It is known that the fluidity of sand settling can be improved by spraying into the pits.

Japanese Patent Laid-Open No. 2007-111683

  However, in the sand pumping facility described in Patent Document 1, since the mixed fluid of the settling sand and water sucked from the suction pipe is jetted from the jet nozzle toward the sand collecting pit through the pipe, The spray nozzle is required to have a size that does not clog. That is, when a large amount of relatively large stones or the like are collected in the sand collecting pit, there is a possibility that the piping for injection and the injection nozzle may be clogged and hinder the operation of the sand lifting equipment. In addition, large stones or the like that cannot be sucked in during normal operation may accumulate in the suction port even if the fluidity is increased by jetting, which may block the suction pipe and hinder the operation of the sand lifting equipment.

  Therefore, the present invention can eliminate the blockage of the jet pump, and in particular, even when a relatively large amount of sediment is accumulated in the sand collecting pit, the clogging of the route branched from the sandpipe is taken into consideration. An object of the present invention is to provide a sand pumping facility that can eliminate the blockage state of the jet pump without performing the operation, and an operation method thereof.

The present invention relates to a sand pumping facility for pumping sand collected in a sand collecting pit of a sand basin to a sand set separator, wherein the sand collected in the sand collecting pit is sucked through a suction pipe by passing pressurized water through a main body. And a jet pump that pumps sand through the sand pumping pipe to the sand settling device, and a function recovery pipe that diverts from the sand pumping pipe and returns the sand that has been sucked into the suction pipe to the sand basin along with pressurized water when sand submersion occurs, And a switching means for selectively switching the pipe through which the sand sinked into the suction pipe flows between the sand-carrying pipe and the function recovery pipe at the time of submergence. rather than lower than the lift, the diameter of the sand deaths during functional recovery tube is equal to or larger than the diameter of the suction tube, to provide a Agesuna equipment.

In this sandpumping facility, normal sandpumping is performed with a sandpipe, and the settling sand collected in the sand collection pit is discharged out of the settling basin. When the jet pump is in a closed state, it is common to perform a backwash process, but the backwash process may not be sufficient to eliminate the closed state. In the sand pumping facility of the present invention, by operating the switching means, the pipe through which the sand settling by the suction pipe flows is switched to the function recovery pipe at the time of sand submergence having a lower lift than the sand pumping pipe, The sand can be returned to the sand basin with pressurized water. In this way, when sanding is performed with the function recovery pipe at the time of sand submergence, since the lifting height is lower, sanding can be performed with a stronger force than during normal sanding with a sandpipe, so the backwash process eliminates it. An obstructed state that cannot be solved can be resolved. Moreover, the function recovery pipe at the time of sand submergence has a diameter equal to or greater than the diameter of the suction pipe, and since there is little risk of clogging due to the sand settling into the suction pipe, a relatively large amount of sand is collected in the sand collection pit. Even in the case of accumulation, the closed state of the jet pump can be eliminated without considering clogging of the function recovery pipe at the time of submergence.

Here, it is preferable that the said sand lifting equipment is provided with the control part which controls a switching means based on the state of a sand settling apparatus. According to this, recognizes the presence or absence of clogging of the jet pump based on the state of precipitation sand separator, a tube through which sand sucked into the suction pipe between the Agesuna tube and sand deaths during functional recovery pipe It can be switched selectively.

  The present invention is also a method for operating the above sand lifting equipment, and in normal times, by operating the switching means, the sand sink sucked into the suction pipe flows into the sand lifting pipe, and the function is restored when submerged. Switching means so that the sand settling device is operated so that it does not flow into the pipe and the sand settling device is not normal, so that the sand set in the suction pipe flows into the function recovery pipe when it is submerged and does not flow into the sand lifting pipe. The operation method of the sanding equipment is provided. According to this method, the closed state of the jet pump can be eliminated, and in particular, even when a relatively large amount of sand is accumulated in the sand collecting pit, clogging of the function recovery pipe at the time of submergence is considered. The blockage state of the jet pump can be solved without this.

  According to the present invention, the closed state of the jet pump can be eliminated, and in particular, even when a relatively large amount of sand is accumulated in the sand collecting pit, clogging of the function recovery pipe at the time of submergence is considered. Therefore, it is possible to provide a sand pumping facility that can eliminate the blocked state of the jet pump and an operation method thereof.

It is a figure which shows the outline | summary of a sand pumping installation. It is a flowchart which shows the process sequence of a backwash process. It is a flowchart which shows the use procedure of a function recovery pipe | tube at the time of a sand submergence.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing an outline of the sand pumping facility of the present embodiment. The sand pumping facility 1 according to the present embodiment includes a water storage tank 2 and a jet pump 3 into which pressurized water is introduced from the water storage tank 2 through a water supply pipe L1 by a pressurized water pump P1. In this facility, the sedimentation sand 5 collected in the sand collection pit 4 of the pond W is sanded and discharged to the sedimentation separator 20 installed outside the sedimentation basin W.

  The jet pump 3 includes a main body 3a, a suction pipe 3b that is connected to the lower portion of the main body 3a and sucks the sand sediment 5 collected in the sand collecting pit 4, and a sand that is connected to the upper portion of the main body 3a and sucked by the suction pipe 3b. 5 and a sand-carrying pipe L3 for sanding the sand 5 to the sand-settling separator 20 together with pressurized water. The suction pipe 3 b has a larger diameter of the suction port than the pipe line above the lower suction port, and the suction port is opened to face the bottom of the sand collection pit 4. A pressure gauge 6 for measuring the degree of negative pressure in the suction pipe 3b is provided in the middle of the suction pipe 3b.

  Moreover, the sand lifting facility 1 includes an excavation line L2 that branches from the water supply pipe L1 and extends toward the deep part of the sand basin W. The excavation line L2 has a tip portion branched into a plurality of lines (two in FIG. 1), and excavation nozzles 7 and 7 for injecting pressurized water are provided at the end portions of the respective lines L2, and the sand collecting pit 4 It is provided for.

  Further, the sand pumping facility 1 includes a sand submerged function recovery pipe L4 that branches from the sand pump pipe L3 of the jet pump 3 and opens near the water surface away from the sand collecting pit 4 of the sand basin W. The function recovery pipe L4 at the time of sand submergence is for returning the sedimentation sand 5 sucked into the suction pipe 3b to the sand basin W together with the pressurized water, and its lift is made lower than the lift of the sandlift pipe L3. Moreover, the diameter of the function recovery pipe L4 at the time of sand submergence is set to be equal to or larger than the diameter of the suction pipe 3b.

  Here, the water supply pipe L1 and the excavation line L2 are provided with valves V1 and V2, respectively. These valves V <b> 1 and V <b> 2 are connected to a control unit (CPU) 8, and opening / closing is controlled by a signal from the control unit 8.

  Further, valves V3 and V4 are provided in the sand raising pipe L3 and the sand submerged function recovery pipe L4, respectively. These valves V3 and V4 are connected to the control unit 8 and are controlled to be opened and closed by a signal from the control unit 8 so that the pipe through which the sand settling sand 5 sucked into the suction pipe 3b flows is sanded with the sandpump L3 and sanded. A switching means for selectively switching between the function recovery pipe L4 is configured.

  The pressurized water pump P <b> 1 is also connected to the control unit 8 and is driven by a signal from the control unit 8. Further, the pressure gauge 6 is also connected to the control unit 8, and the control unit 8 acquires pressure information in the suction pipe 3 b from the pressure gauge 6.

  Outside the sedimentation basin W, above the sedimentation basin W and above the water storage tank 2, a sedimentation separator 20 is installed. The sedimentation separator 20 includes a sedimentation separator 21 and a hopper 22. The sedimentation separator 21 separates the fluid mixture of the sedimentation sand 5 and water pumped by the jet pump 3 into solid and liquid, and discharges the sand to the hopper 22 while draining water with the screw conveyor 21a. It is.

  The hopper 22 is a container for storing sand separated and discharged by the sand settling machine 21. The hopper 22 is provided with a weigh scale 23 for measuring the weight of sand stored in the hopper 22. The weight scale 23 is connected to the control unit 8, and the control unit 8 acquires weight information of the hopper 22 from the weight scale 23.

  Next, an operation method of the sand lifting facility 1 will be described with reference to FIGS. 2 and 3. In the following description, it is assumed that the sand raising facility 1 is automatically operated by the control unit 8.

  FIG. 2 is a flowchart showing a processing procedure of backwashing processing. During normal operation of the sand lifting facility 1, the valves V1, V2, and V3 are opened and the valve V4 is closed (step S21). When the pressurized water pump P1 is driven, pressurized water is introduced into the jet pump 3 from the water storage tank 2 through the water supply pipe L1, and the pressurized water is directed to the sand settling separator 20 through the sand pumping pipe L3. At this time, since a negative pressure is generated in the jet pump 3, a suction force is generated in the suction pipe 3b, and the sand settling water 5 and water accumulated in the sand collecting pit 4 are sucked into the suction pipe 3b. The sand-settled sand 5 and water sucked into the suction pipe 3b are pumped together with the pressurized water to the sand-settling separator 20 through the sand pumping pipe L3 via the main body 3a of the jet pump 3. In the sedimentation separator 20, the fluid mixture of the sedimentation sand 5 and water is separated into sand and water by the sedimentation separator 21, and the separated sand is stored in the hopper 22. As a result, the weight of the hopper 22 increases.

  During normal operation of the sand pumping facility 1, the control unit 8 acquires weight information obtained from the weighing scale 23 of the hopper 22 and pressure information obtained from the pressure gauge 6. First, the weight of the hopper 22 is set to a predetermined value. It is determined whether it has increased (step S22). When the weight of the hopper 22 does not increase to a predetermined value, the process proceeds to a step (FIG. 3) using a sand submerged function recovery pipe L4 described later. On the other hand, if the weight of the hopper 22 has increased to a predetermined value, it is next determined whether or not the negative pressure of the suction pipe 3b indicated by the pressure gauge 6 is normal (step S23). If the negative pressure of the pressure gauge 6 is normal, the process returns to step S22, and the above determination is repeated for newly acquired weight information and pressure information.

  When the negative pressure of the pressure gauge 6 is not normal, for example, it is considered that the suction port of the suction pipe 3b is submerged and blocked in the sand settling 5, and therefore, a backwash process is performed. That is, the valve V3 is closed (step S24). Thereby, pressurized water spouts toward the sand collection pit 4 from the suction inlet of the suction pipe 3b. This state is maintained for a predetermined time T1 (step S25), and then the valve V3 is opened to end the backwash process (step S26).

  After performing the backwash process, it is determined whether the number of backwashes is equal to or greater than a specified value (step S27). If the number of backwashes is not equal to or greater than the specified value, the number of backwashes is counted up (step S28) and the original operation state (step S22) is returned. When the number of backwashing is equal to or more than the specified value (that is, after performing the backwashing process several times), the process proceeds to the step of using the sand submerged function recovery pipe L4 described below.

  FIG. 3 is a flowchart showing the procedure for using the function recovery pipe L4 when submerged. In the flowchart of FIG. 2, when the weight of the hopper 22 is not increased to a predetermined value, or when the number of backwashing is a specified value or more, for example, a relatively large stone or the like is clogged in the suction pipe 3 b and sanding cannot be performed. The valve V3 is closed (step S31), and then the valve V4 is opened (step S32). Thereby, the sand, water, and pressurized water sucked into the suction pipe 3b are discharged from the function recovery pipe L4 at the time of sand submergence and returned to the vicinity of the water surface away from the sand collecting pit 4 of the sand basin W. This state is maintained for a predetermined time T2 (step S33), and then the valve V4 is closed in order to end the use of the sand-recovery function recovery pipe L4 (step S34).

  Next, it is determined whether or not the sand lifting function of the sand lifting facility 1 has been recovered (step S35). Here, for example, the determination is made based on an increase in the weight of the hopper 22 or a negative pressure indicated by the pressure gauge 6. When the sand lifting function is restored, the valve V3 is opened (step S36), and the original operation state (step S22 in FIG. 2) is restored. If the sanding function has not recovered, it is determined whether or not the valve V4 has been used more than the specified number of times (step S37). If the number of uses is not equal to or more than the specified number, the number of uses is counted up (step S38), the process returns to step S32, and the valve V4 is used again (opened). If the number of times of use is equal to or greater than the specified number of times (that is, after several use of the function recovery pipe L4 at the time of submergence), the valves V1 and V2 are closed (step S39), and the pressurized water pump P1 is stopped (step S40). ) Stop the sand pumping equipment 1. Although not shown, after the sanding function is restored or after the sanding facility 1 is stopped, the number of backwashes and the number of times the valve V4 is used are reset.

  As described above, according to the sand pumping facility 1 of the present embodiment, during normal operation, normal sand pumping is performed by the sand pumping pipe L3, and the sand settling 5 accumulated in the sand collecting pit 4 is placed outside the sand settling basin W. Can be discharged. When any part of the jet pump 3 is in a closed state (for example, when the suction port of the suction pipe 3b is submerged), the backwash process can be performed as usual, and the backwash process is blocked. When the state is not sufficiently eliminated, the function recovery pipe L4 at the time of sand submergence can be used. That is, in the sand lifting facility 1, as described above, by operating the valves V3 and V4 as switching means, the pipe through which the sand settling sand 5 sucked by the suction pipe 3b flows is sand having a lower head than the sand lifting pipe L3. By switching to the function recovery pipe L4 at the time of sinking, sand can be pumped, and the settling sand 5 can be returned to the settling basin W together with the pressurized water. In this way, when sand is submerged with the function recovery pipe L4 during sand submergence, because the head is lower, sand can be pumped with a stronger force than when sanding with the sand pipe L3, so the backwash process eliminates it. An obstructed state that cannot be solved can be resolved.

  Moreover, the function recovery pipe L4 at the time of sand submergence is relatively large because its diameter is equal to or larger than the diameter of the suction pipe 3b and is less likely to be clogged by the sand sink 5 sucked into the suction pipe 3b. Even when a large amount of the settling sand 5 is accumulated in the sand collecting pit, the closed state of the jet pump can be eliminated without considering the clogging of the function recovery pipe L4 when submerged. For example, in the sand raising facility described in Patent Document 1, the pipe corresponding to the function recovery pipe L4 at the time of sand submergence in the present embodiment extends to the vicinity of the sand collecting pit, and the injection nozzle is provided at the tip thereof. Although the clogging is a concern, the function recovery pipe L4 at the time of sand submergence in the present embodiment has a diameter equal to or larger than the diameter of the suction pipe 3b, and therefore it is not necessary to consider such clogging. .

  In addition, when the suction port of the suction pipe 3b is submerged in the sand sink 5 and closed, the negative pressure indicated by the pressure gauge 6 is not normal, so whether or not the backwash process is performed (and the backwash process is repeated). The subsequent use of the function recovery pipe at the time of submergence) can be easily determined as described above. However, when the suction pipe 3b is blocked by a relatively large stone or the like, water is sufficiently sucked from the gap between the stones and the suction pipe 3b is blocked and lifted even if the negative pressure indicated by the pressure gauge is normal. There may be cases where sand is not possible. In this case, it is difficult to determine whether the suction pipe 3b is blocked only by the pressure gauge 6. Here, according to the sand pumping facility 1 of the present embodiment, there is a step of determining whether or not to use the sand submerged function recovery pipe L4 based on the weight information of the weigh scale 23 of the hopper 22 (step) Therefore, whether or not the suction pipe 3b is closed can be determined regardless of the state of the pressure gauge 6 by determining whether or not the weight of the hopper 22 is increased by a predetermined amount. That is, based on the weight information obtained from the weigh scale 23 of the hopper 22, the presence or absence of blockage of the suction pipe 3b is recognized. The sand lifting equipment 1 can be operated by selectively switching between the recovery pipe L4.

  Moreover, since the sand lifting equipment 1 is equipped with the excavation line L2, by opening the valve V2 provided in the excavation line L2, if necessary, from the excavation nozzles 7 and 7 at the end thereof, Pressurized water can be sprayed toward the sand collecting pit 4. Thereby, the sedimentation sand 5 collected in the sand collecting pit 4 is loosened and the fluidity is increased, and it is easily sucked into the suction pipe 3b. Therefore, the blockage of the jet pump 3 can be prevented or improved.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, it is determined whether or not the sand-recovery function recovery pipe L4 is used based on the weight information of the weigh scale 23 of the hopper 22, but this is determined based on the current of the screw conveyor 21a of the sand settling separator 21. You may determine based on value information.

  Moreover, in the said embodiment, as a means to selectively switch the pipe | tube through which the sedimentation sand 5 suck | inhaled by the suction pipe 3b flows between the sand raising pipe L3 and the sand submerged function recovery pipe | tube L4, several valve | bulb V3, V4 is used. Although the example of using was shown, you may use a three-way valve etc. instead.

  In the above embodiment, the control unit 8 performs automatic control by controlling the opening and closing of the pressurized water pump P1 and the valves V1, V2, V3, and V4, and acquiring information from the pressure gauge 6 and the weight gauge 23. An operator may perform some or all of these (so-called manual operation).

  DESCRIPTION OF SYMBOLS 1 ... Sand pumping equipment, 3 ... Jet pump, 3a ... Main part, 3b ... Suction pipe, 4 ... Sand collection pit, 5 ... Sand collection, 8 ... Control part, 20 ... Sand sedimentation apparatus, L3 ... Sand collection pipe, L4 ... Function recovery pipe at the time of sand submergence, V3, V4 ... Valve (switching means).

Claims (3)

A sand pumping facility that pumps the sand collected in the sand collecting pit of a sand basin to a sand settling device,
A jet pump that sucks the sediment collected in the sand collection pit by passing the pressurized water through the main body through the suction pipe and pumps the sand together with the pressurized water through the sand lifting pipe to the sand sediment separator;
A function recovery pipe at the time of sand submergence, which branches from the sandpipe pipe and returns the sand settled into the suction pipe to the sand basin together with the pressurized water when sand submergence occurs;
A switching means for selectively switching the pipe through which the settling sand sucked into the suction pipe flows between the sand pumping pipe and the sand submerged function recovery pipe ,
The lift of the sand deaths during functional recovery tube, rather than lower than the lift of the lifting sand tube,
The diameter of the said function recovery pipe | tube at the time of sand immersion is a sand pumping installation which is more than the diameter of the said suction pipe . A control unit for controlling the switching means based on a state of the prior SL sand separator, Agesuna equipment according to claim 1, wherein. An operation method of the sand lifting facility according to claim 1 ,
In normal times, by operating the switching means, the sand sink sucked into the suction pipe flows so as to flow into the sand raising pipe and does not flow into the sand recovery function recovery pipe,
When the state of the sand settling device is not normal, the switching means is operated so that the sand set in the suction pipe flows into the function recovery pipe at the time of sand submergence and does not flow into the sand lifting pipe. , How to operate the sanding equipment.

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