Transfer device for solid-liquid mixtures

Abstract

This invention provides a technology that can effectively switch the destination of a solid-liquid mixture settling in a storage tank to a destination other than the designated supply destination. [Solution] In the transfer device 100, the first flow path section 51 is a path through which fluid flows between the discharge port 51A located at a first position in the storage tank 115 and the pump P. The second flow path section 52 is a path through which fluid flows from the pump P toward the downstream supply destination 120. The switching section 70 is a device that switches the flow between at least a first state and a second state. The first state is a state in which fluid is allowed to flow from the discharge port 51A to the supply destination 120 via the first flow path section 51 and the second flow path section 52, while the fluid flow from the first flow path section 51 to the inlet 54A is blocked. The second state is a state in which fluid flow from the second flow path section 52 toward the supply destination 120 is blocked, while fluid is allowed to flow from the first flow path section 51 to the inlet 54A.

Description

Technical Field

[0006] , , , ,

[0001] The present invention relates to a transfer device for a solid-liquid mixture

Background Art

[0002] The turbid water treatment apparatus disclosed in Patent Document 1 includes a thickener that settles the aggregated slurry in turbid water to separate the slurry and the supernatant water, a discharge treatment water tank that stores and discharges the separated supernatant water, a slurry tank that stores the turbid water containing the settled slurry, and a filter press that compressively filters the turbid water stored in the slurry tank to separate it into a dewatered cake and a filtrate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a turbid water treatment system used in a filter press device or the like, a method is used in which a solid-liquid mixture is stored in a storage tank, and the settled solid-liquid mixture (a solid-liquid mixture containing a large amount of solid components) is transferred by a transfer device to a supply destination (such as a filter press device). A general method of this type of transfer device is simply to supply the settled solid-liquid mixture in one direction from the discharge port in the storage tank toward a predetermined supply destination, so there is a problem that it cannot cope with the case where the supply path needs to be changed for some reason.

[0005] One of the objectives of the present disclosure is to provide a technique that can effectively switch the flow destination of the solid-liquid mixture that settles in the storage tank to a destination other than the defined supply destination in order to solve at least one of the above-described problems.

Means for Solving the Problems

[0006] One of the disclosures is a solid-liquid mixture transfer device, A transfer device for transferring a solid-liquid mixture from a storage tank that stores the solid-liquid mixture, A pump for transferring fluid, In the storage tank, a first flow path is a path through which fluid flows between the discharge port located at a first position and the pump, The second flow path is a path through which fluid flows from the aforementioned pump toward the downstream supply destination, Another flow path section having one or more flow paths different from the first flow path section and the second flow path section, and capable of guiding fluid to an inlet located above the discharge port in the storage tank, The first flow channel section, the second flow channel section, and the switching section which switches the flow in the other flow channel section between at least a first state and a second state, Equipped with, The first state is a state in which fluid is allowed to flow from the outlet to the supply destination via the first and second flow channels, and fluid flow from the first flow channel to the inlet is blocked. The second state is a state in which the flow of fluid to the supply destination via the second flow channel is blocked, while the flow of fluid from the first flow channel to the inlet is permitted. [Effects of the Invention]

[0007] The technology relating to this disclosure can effectively switch the destination of the solid-liquid mixture that settles in the storage tank to a destination other than the specified supply destination. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a block diagram illustrating the configuration of a turbid water treatment system equipped with a solid-liquid mixture transfer device according to the first embodiment. [Figure 2] Figure 2 is an explanatory diagram illustrating the thickener, storage tank, filter press device, etc., in the turbid water treatment system shown in Figure 1. [Figure 3] Figure 3 is a simplified explanatory diagram illustrating a solid-liquid mixture transfer device according to the first embodiment. [Modes for carrying out the invention]

[0009] The embodiments of this disclosure are listed and illustrated below.

[0010] [1] A transfer device for transferring a solid-liquid mixture from a storage tank for storing the solid-liquid mixture, A pump for transferring fluid, In the storage tank, a first flow path is a path through which fluid flows between the discharge port located at a first position and the pump, The second flow path is a path through which fluid flows from the aforementioned pump toward the downstream supply destination, Another flow path section having one or more flow paths different from the first flow path section and the second flow path section, and capable of guiding fluid to an inlet located above the discharge port in the storage tank, The first flow channel section, the second flow channel section, and the switching section which switches the flow in the other flow channel section between at least a first state and a second state, Equipped with, The first state is a state in which fluid is allowed to flow from the outlet to the supply destination via the first and second flow channels, and fluid flow from the first flow channel to the inlet is blocked. The second state is a state in which the flow of fluid to the supply destination via the second flow channel is blocked, while the flow of fluid from the first flow channel to the inlet is permitted. A device for transferring solid-liquid mixtures.

[0011] The solid-liquid mixture transfer device described in [1] above can switch between transferring the solid-liquid mixture from the lower part of the storage tank to the supply destination and transferring the solid-liquid mixture from the lower part of the storage tank back to the inlet above the discharge port.

[0012] [2] The other flow path section includes a third flow path section which is a bypass path connected to the first flow path section and the second flow path section, and a fourth flow path section which is a path through which fluid flows between the inlet and the first flow path section. The switching unit switches the flow in the first flow path unit, the second flow path unit, the third flow path unit, and the fourth flow path unit to at least the first state and the second state. In the first state, the flow of fluid through the third flow path unit between the first flow path unit and the second flow path unit is blocked, the flow of fluid through the fourth flow path unit between the first flow path unit and the inlet is blocked, and the flow of fluid from the discharge port through the first flow path unit and the second flow path unit to the supply destination is allowed. In the second state, the flow of fluid through the third flow path unit between the first flow path unit and the second flow path unit is allowed, the flow of fluid through the fourth flow path unit between the first flow path unit and the inlet is allowed, and the flow of fluid through the second flow path unit to the supply destination is blocked. The transfer device for the solid-liquid mixture according to [1].

[0013] The transfer device for the solid-liquid mixture in [2] above can switch between the transfer of supplying the solid-liquid mixture below the storage tank to the supply destination and the transfer of returning the solid-liquid mixture below the storage tank to the inlet above the discharge port with a simple configuration in which the third flow path unit and the fourth flow path unit are provided in a characteristic arrangement.

[0014] (3) One end of the third flow path unit is connected to the first branch unit provided in the first flow path unit. The other end of the third flow path unit is connected to the second branch unit provided in the second flow path unit. One end of the fourth flow path unit is connected to the third branch unit provided in the first flow path unit. The other end of the fourth flow path unit is the inlet or is communicated with the inlet. A first valve is provided between the first branch unit and the discharge port in the first flow path unit. A second valve is provided between the first branch unit and the second branch unit in the first flow path unit. A third valve is provided on the downstream side of the second branch unit in the second flow path unit. A fourth valve is provided in the third flow path unit. A fifth valve is provided in the fourth flow path section. The first state is a state in which the first valve, the second valve, and the third valve are all open, and the fourth valve and the fifth valve are both closed. The second state is a state in which the first valve, the fourth valve, and the fifth valve are all open, and the second valve and the third valve are both closed. When the pump operates in the first state, fluid flows from the outlet through the first and second flow channels toward the supply destination. When the pump operates in the second state, fluid flows from the outlet through the third and fourth flow channels to the inlet. A transfer apparatus for solid-liquid mixtures as described in [2].

[0015] The solid-liquid mixture transfer device described in [3] above has a simple configuration in which the third and fourth flow channels are arranged in a characteristic way, and the first to fifth valves are arranged in a characteristic way, which allows switching between transferring the solid-liquid mixture from the lower side of the storage tank to the supply destination and transferring the solid-liquid mixture from the lower side of the storage tank back to the inlet above the discharge port.

[0016] <First Embodiment>

[0017] 1. Configuration of the turbid water treatment system 10 Figure 1 is a block diagram showing the schematic configuration of the turbid water treatment system 10. The turbid water treatment system 10 comprises a raw water tank 11, a classifier 12, a sedimentation pit 20, a thickener 13, a treated water tank 14, a slurry tank 15, and a filter press 16.

[0018] The raw water tank 11 stores a certain amount of turbid water MW so that the raw water of turbid water MW can be continuously treated. Turbid water MW is turbid water containing mud, sand, etc., and can be, for example, turbid water generated by tunnel excavation work, but is not limited to this, and can be turbid water generated by various construction work or drainage. The turbid water MW stored in the raw water tank 11 is sent to the classifier 12 via the supply passage L1 by the driving force of the pump P1.

[0019] The classifier 12 separates large and small particles contained in the turbid water MW, and various well-known classifiers can be used. For example, a classifier with a spiral or mesh structure can separate particles by size, and large particles such as stones are discharged to the outside for disposal. Small particles, including sand and mud, are stored in a tank (not shown) provided in the classifier 12 and then sent to the next sedimentation pit 20. For example, pebbles are removed by the classifier 12, and the turbid water MW containing sand and mud is sent to the sedimentation pit 20 via the supply passage LS driven by the pump PS.

[0020] The sedimentation pit 20 is a facility that temporarily stores turbid water sent through the supply channel LS and functions to settle the sand contained in the turbid water during storage. The turbid water supplied to and temporarily stored in the sedimentation pit 20 is sent to the thickener 13 via the water supply channel L2 by the driving force of the pump P2.

[0021] Thickener 13 is a facility that stores turbid water MW and separates the slurry from the tap water by allowing the slurry in the turbid water MW to settle. Inside thickener 13, suspended solids, which are fine solid particles in the turbid water MW, are allowed to settle, separating them into slurry, which is concentrated with these fine solid particles, and supernatant liquid (purified water), from which a predetermined amount of fine solid particles have been removed. A sludge scraping device is installed at the bottom of thickener 13. The slurry that settles at the bottom of thickener 13 is scraped towards the center by the sludge scraping device and sent to slurry tank 15. The supernatant liquid from the upper layer of thickener 13 is sent to the treated water tank 14 via the water supply channel L3 by the driving force of pump P3.

[0022] The treatment tank 14 in Figure 1 stores or discharges the treated water obtained as the supernatant from the thickener 13. After being temporarily stored in the treatment tank 14, it is discharged into a river or the like. The slurry tank 15 temporarily stores excess slurry. The slurry stored in the slurry tank 15 is sent to the filter press 16 via the discharge passage L4 by the driving force of the pump P4.

[0023] The filter press 16 is a device that dewaters slurry by pressurizing it between a filter plate and a filter cloth, forming a plate-shaped sludge cake. The filter press 16 separates the turbid water MW containing the slurry that has been coagulated and settled in the thickener 13 into a dewatered cake and filtrate by compression filtration. The cake is discharged to a predetermined location below, and the filtrate squeezed out at that time is returned to the raw water tank 11 via the return path L5 by the driving force of the pump P5. The filtrate may be returned to the thickener 13 instead of the raw water tank 11.

[0024] The raw water tank 11, the overflow containment section 20B of the sedimentation pit 20, the thickener 13, the slurry tank 15, and the treated water tank 14 are equipped with water level gauges (not shown). Each pump P1 to P5, PS starts operating when the water level rises to a preset operating level based on the water level detected by the water level gauge, and stops operating when the water level drops to a preset stop level.

[0025] 2. Treatment process for turbid water Raw water (water to be treated) discharged from construction sites and other sources is transported to the raw water tank 11 and stored there. The turbid water MW stored in the raw water tank 11 is sent to the classifier 12 via the supply channel L1, where pebbles and other debris are removed, and then stored in the classifier 12's tank. The turbid water MW stored in the tank is supplied to the sedimentation pit 20 via the supply channel LS. The turbid water MW contained in the sedimentation pit 20 is sent to the thickener 13 via the supply channel L2. The turbid water MW supplied to the thickener 13 is separated into supernatant purified water and settled slurry, as shown in Figure 2. The supernatant (purified water) separated in the thickener 13 is sent to the treated water tank 14 via the supply channel L3 shown in Figure 1, and discharged from this treated water tank 14 into the natural water system. Meanwhile, the slurry settled in the thickener 13 is sent to the slurry tank 15, as shown in Figures 1 and 2. The slurry stored in the slurry tank 15 is sent from the slurry tank 15 to the filter press 16 by the transfer unit shown in Figures 2 and 3. The slurry (solid-liquid mixture) sent to the filter press 16 is dewatered by the filter press 16, and a cake is formed by the filter press 16.

[0026] 3. Driving motion and reverse driving motion Figure 3 illustrates the details of the transfer device 100. The transfer device 100 is a device that transfers a solid-liquid mixture from a storage tank 115 that stores the solid-liquid mixture. When the transfer device 100 of Figure 3 is applied to the system of Figure 1, the storage tank 115 is the slurry tank 15, and the pump P that transfers the fluid is pump P5.

[0027] The transfer device 100 comprises a first flow channel section 51, a second flow channel section 52, and other flow channel sections. In the example shown in Figure 3, the third flow channel section 53 and the fourth flow channel section 54 correspond to examples of other flow channel sections.

[0028] The first flow path 51 is a path through which fluid flows between the discharge port 51A, located at a first position in the storage tank 115, and the pump P.

[0029] The second flow path 52 is a path through which fluid flows from the pump P to the downstream supply destination 120.

[0030] Another flow channel section has one or more flow channels different from the first flow channel section 51 and the second flow channel section 52, and is a flow channel capable of guiding fluid to an inlet 54A located above the outlet 51A in the storage tank 115.

[0031] The third channel section 53 is a bypass path connected to the first channel section 51 and the second channel section 52.

[0032] The fourth flow channel section 54 is a path through which fluid flows between the inlet 54A and the first flow channel section 51.

[0033] The switching unit 70 is a device that switches the flow in the first flow channel 51, the second flow channel 52, and another flow channel between at least a first state and a second state. Specifically, the switching unit 70 switches the flow in the first flow channel 51, the second flow channel 52, the third flow channel 53, and the fourth flow channel 54 between at least a first state and a second state.

[0034] The first state is one in which fluid is allowed to flow from the outlet 51A to the supply destination 120 via the first flow path section 51 and the second flow path section 52, while preventing fluid from flowing from the first flow path section 51 to the inlet 54A. Specifically, the first state is one in which fluid is prevented from flowing between the first flow path section 51 and the second flow path section 52 via the third flow path section 53, fluid is prevented from flowing between the first flow path section 51 and the inlet 54A via the fourth flow path section 54, and fluid is allowed to flow from the outlet 51A to the supply destination 120 via the first flow path section 51 and the second flow path section 52.

[0035] The second state is one in which the flow of fluid to the supply destination 120 via the second flow channel 52 is blocked, while the flow of fluid from the first flow channel 51 to the inlet 54A is permitted. Specifically, the second state is one in which the flow of fluid is permitted between the first flow channel 51 and the second flow channel 52 via the third flow channel 53, the flow of fluid is permitted between the first flow channel 51 and the inlet 54A via the fourth flow channel 54, and the flow of fluid to the supply destination 120 via the second flow channel 52 is blocked.

[0036] The following explanation concerns further details of the structure. One end of the third channel section 53 is connected to the first branch section 61 provided in the first channel section 51. The other end of the third channel section 53 is connected to the second branch section 62 provided in the second channel section 52. One end of the fourth channel section 54 is connected to the third branch section 63 provided in the first channel section 51. The other end of the fourth channel section 54 is either an inlet 54A or is in communication with an inlet 54A.

[0037] A first valve 71 is provided between the first branch 61 and the outlet 51A in the first flow path section 51. A second valve 72 is provided between the first branch 61 and the second branch 62 in the first flow path section 51. A third valve 73 is provided downstream of the second branch 62 in the second flow path section 52. A fourth valve 74 is provided in the third flow path section 53. A fifth valve 75 is provided in the fourth flow path section 54.

[0038] In this configuration, the first state is when the first valve 71, the second valve 72, and the third valve 73 are all open, and the fourth valve 74 and the fifth valve 75 are both closed. The second state is when the first valve 71, the fourth valve 74, and the fifth valve 75 are all open, and the second valve 72 and the third valve 73 are both closed.

[0039] When the pump P operates in the first state, fluid flows from the discharge port 51A through the first flow path section 51 and the second flow path section 52 toward the supply destination 120.

[0040] When the pump P operates in the second state, fluid flows from the outlet 51A through the third flow path section 53 and the fourth flow path section 54 to the inlet 54A.

[0041] 4. Examples of effects The transfer device 100 can switch between transferring the solid-liquid mixture from the lower part of the storage tank 115 to the supply destination 120 and transferring the solid-liquid mixture from the lower part of the storage tank 115 back to the inlet 54A above the outlet 51A.

[0042] Specifically, the transfer device 100 has a simple configuration in which the third flow channel section 53 and the fourth flow channel section 54 are arranged in a characteristic configuration, and the first to fifth valves are arranged in a characteristic configuration, which allows it to switch between transferring the solid-liquid mixture from the lower side of the storage tank 115 to the supply destination 120 and transferring the solid-liquid mixture from the lower side of the storage tank 115 back to the inlet 54A above the discharge port 51A.

[0043] <Other Embodiments> This disclosure is not limited to the embodiments described above and in the drawings. For example, any combination of the features of the embodiments described above or below is possible as long as it does not contradict each other. Furthermore, any feature of the embodiments described above or below may be omitted unless explicitly stated as essential. In addition, the embodiments described above may be modified as follows.

[0044] In the embodiment described above, the storage tank 115 was the slurry tank 15 shown in Figure 1, but other types of tanks may also be used as the storage tank 115.

[0045] The recipient 120 may be equipment or facilities other than a filter press.

[0046] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is not limited to the embodiments disclosed herein, and is intended to include all modifications within the scope set forth in the claims or equivalents thereof. [Explanation of Symbols]

[0047] 10: Turbid water treatment system 13: Thickener 15: Slurry Tank 16: Filter press 51: First flow channel section 51A: Discharge port 52: Second flow channel section 53: Third channel section 54: Fourth channel section 54A:Inlet 61: First branching point 62: Second branching point 63: Third branching point 70: Switching section 71: First defense 72: Second defense 73: Third defense 74: Fourth defense 75: Fifth defense 100: Transfer device 115: Storage tank 120: Supplier P: Pump

Claims

1. A transfer device for transferring a solid-liquid mixture from a storage tank that stores the solid-liquid mixture, A pump for transferring fluid, In the storage tank, a first flow path is a path through which fluid flows between the discharge port located at a first position and the pump, The second flow path is a path through which fluid flows from the pump toward the downstream supply destination, Another flow path section having one or more flow paths different from the first flow path section and the second flow path section, and capable of guiding fluid to an inlet located above the discharge port in the storage tank, The first flow channel section, the second flow channel section, and the switching section which switches the flow in the other flow channel section between at least a first state and a second state, Equipped with, The first state is a state in which fluid is allowed to flow from the outlet through the first and second flow channels to the supply destination, while preventing fluid from flowing from the first flow channel to the inlet. The second state is a state in which the flow of fluid to the supply destination via the second flow channel is blocked, while the flow of fluid from the first flow channel to the inlet is permitted. A device for transferring solid-liquid mixtures.

2. The other flow path section includes a third flow path section which is a bypass path connected to the first flow path section and the second flow path section, and a fourth flow path section which is a path for fluid to flow between the inlet and the first flow path section. The switching unit switches the flow in the first flow path section, the second flow path section, the third flow path section, and the fourth flow path section between at least the first state and the second state. The first state is a state in which the flow of fluid through the third flow path is blocked between the first flow path and the second flow path, the flow of fluid through the fourth flow path is blocked between the first flow path and the inlet, and the fluid is allowed to flow from the outlet through the first flow path and the second flow path to the supply destination. The second state is a state in which fluid is allowed to flow through the third flow channel between the first flow channel and the second flow channel, fluid is allowed to flow through the fourth flow channel between the first flow channel and the inlet, and the flow of the fluid to the supply destination through the second flow channel is blocked. A transfer apparatus for solid-liquid mixtures according to claim 1.

3. One end of the third flow path is connected to the first branch section provided in the first flow path section. The other end of the third flow path is connected to the second branch section provided in the second flow path section. At the third branch section provided in the first flow path section, one end of the fourth flow path section is connected. The other end of the fourth flow channel is the inlet or is in communication with the inlet. In the first flow path section, a first valve is provided between the first branch section and the discharge port. In the first flow path section, a second valve is provided between the first branch section and the second branch section. In the second flow path section, a third valve is provided downstream of the second branch section. A fourth valve is provided in the third flow path section. A fifth valve is provided in the fourth flow path section. The first state is a state in which the first valve, the second valve, and the third valve are all open, and the fourth valve and the fifth valve are both closed. The second state is a state in which the first valve, the fourth valve, and the fifth valve are all open, and the second valve and the third valve are both closed. When the pump operates in the first state, fluid flows from the discharge port through the first flow path and the second flow path toward the supply destination. When the pump operates in the second state, fluid flows from the outlet through the third and fourth flow channels to the inlet. The solid-liquid mixture transfer apparatus according to claim 2.

Images