Variable In-Pipe Coagulation Device

Abstract

This invention provides a variable in-pipe coagulation device that uses an orifice installed inside a pipe to agitate, mix, and coagulate two liquids with a vortex generated downstream. The orifice hole diameter facing the flow path inside the pipe can be easily adjusted according to the coagulation state, and the internal cleaning can be easily performed without the need for disassembly. [Solution] In an in-pipe flocculation device that stirs, mixes, and flocculates sludge and a flocculant by installing an orifice inside the pipe, the device includes an orifice plate 3 having a plurality of orifice holes 2 of different diameters that open in a circular pattern, a casing 4 that has a connecting passage 5 that connects to the sludge pipe 6 and rotatably encloses the orifice plate 3 so that the orifice holes 2 are located in the connecting passage 5, and an adjustment device 8 that extends from the orifice plate 3 to the outside of the casing 4. As a result, the diameter of the orifice holes can be easily changed from the outside, making it possible to adjust the stirring strength according to the flocculation state.

Description

【Technical Field】 【0001】 The present invention relates to a variable-type in-pipe coagulation device capable of adjusting the stirring intensity by making it possible to easily change the orifice diameter inside a pipe in a line mixer that performs coagulation of sludge and a coagulant inside the pipe during continuous operation. 【Background Art】 【0002】 Conventionally, dehydration devices such as screw presses for dehydrating sewage sludge and the like need to dehydrate the material coagulated with a coagulant. As shown in FIG. 8, the coagulated sludge obtained by rotating stirring blades in a coagulation mixing tank to stir and mix sludge and a coagulant is supplied to the dehydration device. 【0003】 Patent Document 1 discloses a pretreatment device that connects a chemical injection nozzle for injecting a chemical to a water intake pipe and provides an orifice composed of a perforated plate having a plurality of holes on the upstream side and the downstream side of the chemical injection nozzle, and rapidly mixes and stirs the chemical in the water intake pipe by the vortex generated from this orifice. 【0004】 Patent Document 2 discloses an in-pipe fluid mixing device that supplies a highly viscous liquid into a pipe and mixes it using a pipe body provided with an orifice body having one or more small-diameter orifice holes. 【0005】 Patent Document 3 discloses a variable orifice device that rotates a plate having a plurality of throttling openings of different diameters incorporated in a casing from the outside to select a throttling opening following fluctuations in the pressure and flow rate of the fluid flowing inside the pipe. 【Prior Art Documents】 【Patent Documents】 【0006】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2008-284452 【Patent Document 2】 Japanese Patent Application Laid-Open No. 50-045367 【Patent Document 3】 Japanese Utility Model Application Laid-Open No. 61-106689 [Overview of the Initiative] [Problems that the invention aims to solve] 【0007】 In sewage sludge, which undergoes rapid changes in properties on a daily basis, it is necessary to adjust the stirring intensity of the sludge and coagulant according to the state of coagulation. However, the mixing and stirring devices described in Patent Documents 1 and 2 require disassembly of the sludge piping to change the orifice diameter, making it difficult to easily change the stirring intensity during continuous operation. 【0008】 The variable orifice device described in Patent Document 3 adjusts the flow rate of the fluid flowing through the pipe, but it does not describe or suggest adjusting the stirring intensity. Furthermore, if sewage sludge is introduced into the pipe, rotating the plate during continuous operation may cause the sludge in the pipe to flow into the casing through the constriction opening, potentially leading to the components sticking together or the debris in the sludge flowing through the pipe becoming entangled around the constriction opening, causing it to become blocked. Therefore, it is necessary to periodically disassemble the casing to clean the sludge that has flowed into the casing and the debris that has become entangled with the plate. 【0009】 The present invention provides a variable in-pipe flocculation device that stirs, mixes, and flocces two liquids by installing an orifice inside the pipe and generating a vortex flow downstream, allowing for easy adjustment of the orifice diameter facing the flow path inside the pipe according to the sludge flocculation state, and enabling easy internal cleaning without the need for disassembly. [Means for solving the problem] 【0010】 The present invention relates to an in-pipe flocculation device that stirs, mixes, and flocces sludge and a flocculant by installing an orifice inside a pipe. The device comprises an orifice plate having multiple orifice holes of different diameters that open circumferentially, a casing having a connecting passage that connects to the sludge piping and rotatably enclosing the orifice plate so that the orifice holes are located in the connecting passage, and an adjustment device extending from the orifice plate to the outside of the casing. As a result, the diameter of the orifice holes can be easily changed from the outside, making it possible to adjust the stirring intensity according to the flocculation state of the sludge. 【0011】 Furthermore, the casing is provided with at least one cleaning fluid supply port for supplying cleaning fluid from the outside to the inside of the casing, thereby allowing cleaning water to be easily supplied to the inside of the casing from the outside. 【0012】 Furthermore, the casing is provided with at least one coagulant supply channel for supplying coagulant into the pipe from the outside, which allows the coagulant to be added immediately before the orifice hole, thereby improving the mixing effect of the sludge and coagulant. [Effects of the Invention] 【0013】 This invention eliminates the need for mechanical agitation by coagulating sludge in an orifice installed inside the pipe, thus enabling a powerless operation. Furthermore, because coagulation occurs within the pipeline, a coagulation and mixing tank can be omitted, reducing installation costs and space requirements. The orifice diameter can be easily adjusted from the outside, allowing for adjustment of the agitation intensity during dewatering. By supplying washing water into the casing from the outside, internal debris entanglement and sludge buildup can be removed without disassembly. [Brief explanation of the drawing] 【0014】 [Figure 1] This is a longitudinal cross-sectional side view of a variable in-pipe agglomeration device according to the present invention. [Figure 2] Similarly, Figure 1 is a cross-sectional view AA of the variable in-pipe agglutination device. [Figure 3] Similarly, Figure 1 shows a cross-sectional view (AA) of the variable in-pipe flocculation device during adjustment. [Figure 4] Similarly, this is a cross-sectional view of the variable in-pipe agglutination device shown in Figure 1. [Figure 5] This is a cross-sectional view of BB of the variable in-pipe flocculation device shown in Figure 1, according to another embodiment. [Figure 6] This is a longitudinal cross-sectional side view of the variable in-pipe flocculation device of the present invention when arranged in series. [Figure 7] This is a longitudinal cross-sectional side view when a coagulant injection device is placed in front of the variable in-pipe coagulation device of the present invention. [Figure 8]This is a dehydration treatment flow diagram using a conventional agglomeration mixing tank. 【Embodiments for Carrying Out the Invention】 【0015】 FIG. 1 is a longitudinal side view of a variable in-pipe agglomeration device. The variable in-pipe agglomeration device 1 includes an orifice plate 3 provided with a plurality of orifice holes 2 of different diameters, a casing 4 for accommodating the orifice plate 3, and an adjuster 8 extending from a rotating member 7 for rotating the orifice plate 3 to the outside of the casing 4. Both ends of a communication passage 5 opened below the casing 4 are connected to sludge pipes 6, 6 to form a flow path. By rotating the adjuster 8 from the outside of the casing 4 to rotate the orifice plate 3 and positioning the orifice holes 2 of an arbitrary diameter in the communication passage 5, it is possible to stir, mix, and agglomerate the sludge and the flocculant conveyed from the upstream sludge pipe 6. 【0016】 FIG. 2 is a cross-sectional view taken along line A-A of the variable in-pipe agglomeration device of FIG. 1. The orifice plate 3 is a disk-shaped metal plate, and a plurality of orifice holes 2 of different diameters are formed in a circumferential shape on the disk surface. Also, each orifice hole 2 is arranged such that the distances from the center of the orifice plate 3 to the centers of each orifice hole 2 are all equal. A rotating member 7 penetrating the center portion is provided at the center of the disk surface of the orifice plate 3. The casing 4 has a space for accommodating the orifice plate 3 and the rotating member 7 inside, and the orifice plate 3 is arranged with a predetermined gap from the inner wall 4a of the casing 4. The rotating member 7 is pivotally supported so as to be rotatable while sliding on the inner wall 4a of the casing 4, and the orifice plate 3 can be rotated by rotating the rotating member 7. 【0017】 The adjuster 8 protrudes so as to penetrate the casing 4 toward the upstream side from the rotating member 7. The gap between the adjuster 8 and the casing 4 is sealed by a water-stop member 9 to prevent the fluid inside the casing 4 from leaking to the outside. As the water-stop member 9, for example, a known member such as an O-ring is used. By manually rotating the adjuster 8 protruding from the casing 4, the orifice plate 3 can be easily rotated from the outside of the casing 4. The adjuster 8 may be shaped so as to be easily rotated using a tool, or a handle may be attached to the adjuster 8 in advance. Further, the adjuster 8 may be arranged toward the downstream side from the rotating member 7. 【0018】 The communication passage 5 opening downward in the casing 4 forms a flow path in the axial direction of the orifice plate 3, and each orifice hole 2 is arranged so as to face the flow path in the communication passage 5 by the rotation of the orifice plate 3. The sludge pipes 6 are respectively connected to both ends of the communication passage 5 via flanges 10, and the variable in-pipe agglomerator 1 is arranged in the middle of the sludge flow path. 【0019】 In FIG. 1, an agglomeration pipe 12 is extended to the upstream side of the communication passage 5, and the agglomeration pipe 12 and the sludge pipe 6 are connected by a flange 10 to secure a space when turning the adjuster 8. However, depending on design conditions and the like, the sludge pipe 6 may be directly connected to the casing 4. 【0020】 FIG. 3 is a cross-sectional view taken along the line A-A during adjustment of the variable in-pipe agglomerator of FIG. 1. When the adjuster 8 is turned, as shown in FIG. 3, the orifice plate 3 rotates, and the orifice holes 2 with different diameters are sequentially positioned in the communication passage 5. By positioning the orifice hole 2 with a desired opening diameter in the communication passage 5, an orifice pipe path can be formed in the flow path. Among the orifice holes 2, if the opening diameter of the orifice hole 2 having the maximum diameter is made the same as the inner diameter of the communication passage 5, it is also possible to make a state where no orifice flow path is formed in the communication passage 5. 【0021】 During operation of a dewatering machine or similar device, a coagulant is added to the sludge in the sludge piping 6 connected upstream of the variable in-pipe coagulation device 1. The sludge and coagulant then flow into the connecting passage 5. As the sludge and coagulant pass through the orifice holes 2, which are positioned opposite each other in the flow path of the connecting passage 5, they are agitated by the vortex current generated immediately after the orifice holes 2. This mixes the sludge and coagulant, enabling sludge coagulation. Furthermore, since the orifice holes 2 located in the connecting passage 5 can be changed by rotating the adjustment tool 8 from outside the casing 4, operation is possible even while sludge is flowing through the sludge piping 6. Therefore, the agitation intensity can be easily changed during continuous operation according to the sludge coagulation state. 【0022】 Furthermore, to facilitate the placement of the orifice hole 2 into the communication passage 5, markings or symbols may be added to the adjustment tool 8, or a fixing device may be attached to secure the orifice plate 3 to prevent it from rotating unintentionally. 【0023】 Here, in the orifice plate 3 shown in Figure 3, each orifice hole 2 is positioned at an equal distance from the center of the orifice plate 3 to the center of each orifice hole 2. Therefore, when the orifice plate 3 is rotated by turning the adjustment tool 8, each orifice hole 2 traces a similar central trajectory. Thus, by positioning the center of the flow path of the communication passage 5 on the central trajectory of the orifice holes 2, the centers of the orifice holes 2 arranged within the communication passage 5 coincide with the center of the flow path, as shown in Figure 4, a cross-sectional view of the BB variable in-tube agglomeration device in Figure 1. This allows for effective agitation of the entire flow path. 【0024】 In this embodiment, the rotation center trajectories of each orifice hole 2 are aligned to be constant. However, by arranging them on different trajectories, it is possible to arrange orifice holes 2 that are eccentric from the center of the flow path within the communication passage 5, as shown in Figure 5(a). Furthermore, as shown in Figure 5(b), multiple orifice holes 2 may be positioned within the flow path. In this way, by arranging the orifice holes 2 positioned eccentrically from the flow path within the communication passage 5, or by changing the number of orifice holes 2 located within the flow path, orifice pipelines with different stirring characteristics can be formed. 【0025】 A cleaning fluid supply port 11 is provided at the top of the casing 4 for injecting cleaning water into the casing 4 from the outside. The cleaning fluid supply port 11 is, for example, a bolt hole and is configured to be opened and closed by tightening and loosening a bolt. When sludge is agglomerating, the bolt is tightened to close the port, and when cleaning is performed, the bolt is loosened to open it. A predetermined gap is provided between the casing 4 and the orifice plate 3, so by passing cleaning water through the cleaning fluid supply port 11, sludge that has flowed into the casing 4 from the connecting passage 5 and debris adhering to the surface of the orifice plate 3 and around the orifice hole 2 can be removed. This prevents sludge from solidifying inside the casing 4 and on the orifice plate 3. 【0026】 The cleaning water supplied into the casing 4 from the cleaning fluid supply port 11 passes through the gap between the casing 4 and the orifice plate 3 and falls into the connecting passage 5. Therefore, for example, when cleaning the inside of the sludge piping 6, the inside of the casing 4 may be cleaned at the same time, and the cleaning wastewater may be discharged together to the outside of the piping. 【0027】 In Figure 1, the cleaning fluid supply port 11 is provided only on the top of the casing 4, but the installation location and number of cleaning fluid supply ports 11 are not limited to this. By injecting cleaning water from multiple cleaning fluid supply ports 11 provided in the circumferential direction of the casing 4, the inside of the casing 4 can be cleaned from multiple directions. In addition, the cleaning fluid supply port 11 is not limited to bolt holes, but can be configured in various ways, such as a lid with a watertight member or an openable and closable door. Furthermore, in this embodiment, cleaning water is supplied from the cleaning fluid supply port 11, but other cleaning fluids such as compressed air, chemical solutions, and powdered chemicals can be selected depending on the situation. 【0028】 Figure 6 is a longitudinal cross-sectional side view of the variable in-pipe flocculation device of the present invention when arranged in series. By arranging multiple variable in-pipe flocculants 1 in series along the sludge piping 6, the stirring intensity can be adjusted arbitrarily. More specifically, the roles of the variable in-pipe flocculants 1a and 1b can be divided, with the first stage variable in-pipe flocculant 1a dispersing and mixing the sludge and flocculant as shown in Figure 6, and the second stage variable in-pipe flocculant 1b forming flocs. This allows for the separation of roles between the two variable in-pipe flocculants 1a and 1b. For example, when adding a highly viscous chemical to digested sludge for flocculation, conventional methods required two flocculation mixing tanks. However, with this invention, multiple variable in-pipe flocculants 1 can be arranged in series, allowing for easy placement along the sludge piping 6 and enabling space-saving and cost-effective operation. Furthermore, since the orifice diameter of each variable in-pipe flocculant 1a and 1b can be changed during operation, pipelines with diverse stirring intensities can be formed without power. 【0029】 Figure 7 is a longitudinal cross-sectional side view showing a coagulant injection device placed before the variable in-pipe coagulation device of the present invention. In another embodiment of the present invention, a coagulant supply passage 13 having an opening in the communication passage 5 upstream of the orifice plate 3 is provided inside the casing 4 of the variable in-pipe coagulation device 1, and is connected to a coagulant supply pump 14 outside the casing 4. When sludge is transported through the sludge piping 6, the coagulant supply pump 14 is activated to draw up coagulant from a coagulant storage tank (not shown) and add the coagulant to the communication passage 5 via the coagulant supply passage 13. The coagulant added to the communication passage 5 is immediately subjected to strong agitation by the orifice effect in the orifice hole 2 and efficiently dispersed in the sludge. The coagulant supply passage 13 may have only one opening in the communication passage 5, or it may have multiple openings in the circumferential direction of the communication passage 5, with each opening being consolidated into the coagulant supply passage 13 inside the casing 4. In the embodiment shown in Figure 7, openings are provided at the top and bottom of the communication passage 5. 【0030】 Furthermore, in the conventional method of adding the coagulant in the sludge piping 6, which is upstream of the variable in-pipe coagulation device 1, the sludge and coagulant flow through the sludge piping 6, which means that the degree of mixing of the sludge and coagulant, as well as the uneven distribution of sludge and coagulant within the pipe, may fluctuate before reaching the orifice hole 2 of the variable in-pipe coagulation device 1. However, in the embodiment shown in Figure 7, by piping the coagulant supply passage 13 upstream of the orifice plate 3 in the variable in-pipe coagulation device 1, the coagulant is added just before the orifice hole 2, and the coagulant always passes through the same position in the orifice hole 2 and mixes with the sludge, so that the coagulant and sludge are stably and uniformly mixed. As a result, the sludge coagulation efficiency can be maintained at high efficiency and at a constant level. [Industrial applicability] 【0031】 The variable in-pipe flocculant of the present invention is not limited to the flocculation of sewage sludge and flocculants, but can be used for the flocculation of any liquid, or any fluid, such as liquid and solid, or liquid and gas, and the stirring intensity can be adjusted during continuous operation. In addition, since the variable in-pipe flocculant of the present invention does not require disassembly when performing internal cleaning, it can be particularly suitable for fluids that tend to entangle inside the device or fluids with high viscosity. [Explanation of Symbols] 【0032】 2 orifice holes 3 Orifice Plate 4. Casing 5 communication passage 6. Sludge piping 8 Adjustment tool 11 Cleaning fluid supply port 13. Coagulant supply channel

Claims

[Claim 1] In an in-pipe coagulation device that installs an orifice inside a pipe to stir, mix, and coagulate sludge and a coagulant, An orifice plate (3) having multiple orifice holes (2) of different diameters that open in a circular pattern, A casing (4) having a connecting passage (5) that connects to the sludge piping (6), and rotatably enclosing an orifice plate (3) such that the orifice hole (2) is located in the connecting passage (5), An adjustment device (8) extends from the orifice plate (3) to the outside of the casing (4), Equipped with A variable in-pipe flocculation device characterized by the following features. [Claim 2] The casing (4) is provided with at least one cleaning fluid supply port (11) for injecting cleaning fluid into the casing (4) from the outside. The variable in-pipe flocculation device according to feature 1. [Claim 3] The casing (4) is provided with at least one coagulant supply passage (13) for supplying coagulant into the pipe from the outside. A variable in-pipe flocculation device according to claim 1 or 2.

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