Dehydration apparatus and dehydration method

Abstract

When dewatering a slurry using a pair of compression rolls, ensure that the dewatered cake conforms to a predetermined standard. [Solution] The dewatering device 100 includes a filter cloth belt 1 that sequentially transports a slurry or sludge-like material to be dewatered S1, a slurry supply unit 2 that supplies the material to be dewatered S1 onto the filter cloth belt 1, a compression roll 51 that compresses the material to be dewatered S1 on the filter cloth belt 1, a sensor 4 that detects the end S2a or width dimension of the dewatered cake S2 ​​transferred onto the compression roll, and a control device 9 that determines the state of the dewatered cake S2 ​​based on the detection result of the sensor 4. If the control device 9 determines, based on the detection result of the sensor 4, that the dewatered cake S2 ​​has deviated from a preset standard, it controls the supply amount of the slurry supply unit 2 or the movement speed of the filter cloth belt 1 to adjust the end S2a of the dewatered cake S2 ​​to meet the standard.

Description

[Technical Field]

[0001] The present invention relates to a dewatering apparatus and a dewatering method. [Background technology]

[0002] Slurries (suspends) and sludges come in various forms depending on their industrial use and the materials they are applied to. For example, waste materials such as fly ash collected during the incineration of municipal solid waste, metals, and soil and stone are processed by turning them into slurries. Slurry or sludge-like materials to be dewatered are processed as dewatered cakes by pressing them to remove water (see, for example, Patent Document 1).

[0003] Patent Document 1 describes a dewatering apparatus that includes a pressurized dewatering transfer unit for pressurizing the material to be dewatered and transferring it to a filter cloth belt, and a material recovery unit for recovering the processed material. In the pressurized dewatering and transfer section, the material to be dewatered on the filter cloth belt is dewatered by applying pressure between the press top roll and the press bottom roll, and the dewatered material (dewatered cake) is transferred to the upper press top roll and separated from the filter cloth belt. In the material recovery section, the material transferred to the upper press top roll is scraped off with a scraper and collected in a recovery box. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Patent No. 4002473 [Overview of the project] [Problems that the invention aims to solve]

[0005] In the dewatering apparatus described in Patent Document 1, when dewatering a slurry continuously supplied onto a filter cloth belt with a pair of compression rolls, there is a problem that, due to changes in the concentration of the supplied slurry, if the concentration is high, the slurry may not be supplied across the entire width of the filter cloth belt. Furthermore, when dewatering the slurry using a pair of compression rolls, there was a problem where the slurry would spill over the filter cloth belt if the concentration was low.

[0006] Therefore, in dewatering equipment, when dewatering the slurry with a pair of compression rolls, it was desirable to supply the slurry so that the width of the leading edge of the dewatered cake remained within a desired width corresponding to the width of the filter cloth belt.

[0007] The present invention has been made in view of the above-mentioned problems, and aims to provide a dewatering apparatus and dewatering method that can ensure that the dewatered cake conforms to a preset standard when dewatering a slurry with a pair of compression rolls. [Means for solving the problem]

[0008] To solve the above problems, the present invention provides a dewatering apparatus comprising: a filter cloth belt for sequentially transporting a slurry or sludge-like material to be dewatered; a slurry supply unit for supplying the material to be dewatered onto the filter cloth belt; a compression roll for compressing the material to be dewatered on the filter cloth belt; a sensor for detecting the edge of the dewatered cake transferred onto the compression roll or the width dimension of the dewatered cake; and a control device for determining the state of the dewatered cake based on the detection result of the sensor, wherein, if the control device determines, based on the detection result of the sensor, that the dewatered cake has deviated from a preset standard, it controls the supply amount of the slurry supply unit or the movement speed of the filter cloth belt to adjust the edge of the dewatered cake to meet the standard.

[0009] Furthermore, the present invention provides a dewatering method comprising the steps of supplying a slurry or sludge-like material to be dewatered onto a transferable filter cloth belt, and compressing the material on the filter cloth belt with a compression roll, wherein the method detects the edge or width dimension of the dewatered cake transferred onto the compression roll and adjusts the supply amount of the material to be dewatered or the movement speed of the filter cloth belt so that the width satisfies a preset standard. [Effects of the Invention]

[0010] According to the dehydration device and dehydration method of the present invention, when dehydrating the slurry with a pair of squeezing rolls, the dehydrated cake can be made to fit within a preset reference width.

Brief Description of the Drawings

[0011] [Figure 1] It is a schematic diagram showing a dehydration device and a dehydration method according to an embodiment of the present invention. [Figure 2] It is a schematic explanatory view of a main part showing the installation state of the sensor. [Figure 3] It is a schematic side view of a main part showing the installation state of the sensor. [Figure 4] It is a schematic plan view of a main part showing the installation state of the sensor.

Modes for Carrying Out the Invention

[0012] Hereinafter, a dehydration device 100 and a dehydration method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. For the sake of convenience, the description will be made with the slurry supply unit 2 side shown in FIG. 1 being above, the cleaning unit 7 side being below, the processed material recovery unit 6 side being on the right, and the squeezing unit 8 being on the left.

[0013] ≪Dehydration Device≫ As shown in FIG. 1, the dehydration device 100 is a filter cloth belt type dehydration device that filters and dehydrates the slurry-like or sludge-like dehydrated treatment object S1 discharged from a slurry concentration tank (not shown) in which the suspension is sedimentation-separated. The dehydration device 100 includes a filter cloth belt 1, a slurry supply unit 2, a negative pressure dehydration unit 3, a sensor 4, a pressure dehydration transfer unit 5, a processed material recovery unit 6, a cleaning unit 7, a squeezing unit 8, and a control device 9.

[0014] The dehydration device 100 only needs to be a device that squeezes the dehydrated treatment object S1 supplied onto the filter cloth belt 1 and the filter cloth belt 1 with a pair of squeezing rolls for dehydration, and is not limited to the structure of FIG. 1. Hereinafter, as an example, the case of a squeezing type roll press dehydrator will be described as an example of the dehydration device 100.

[0015] ≪Object to be dehydrated≫ Examples of the object to be dehydrated S1 include surplus sludge in the food industry, gluten meal, surplus sludge in the chemical industry, aluminum hydroxide, magnesium hydroxide, calcium carbonate, ceramic raw materials, lead-containing sludge, copper-containing sludge, zinc oxide sludge in the non-ferrous metal industry, activated surplus sludge from sewage, domestic sewage sludge, and the like.

[0016] Hereinafter, as an example of the object to be dehydrated S1, the case of concentrating a slurry containing solid particles of incineration fly ash will be described as an example. As shown in FIG. 1, the object to be dehydrated S1 is configured to be supplied onto a filter cloth belt 1 fed out from a throttle portion 8.

[0017] ≪Dehydrated cake≫ The dehydrated cake S2 refers to the object to be dehydrated S1 that has been pressure-dehydrated by a press top roll 51 and a press bottom roll 52 of a pressure dehydration transfer portion 5.

[0018] ≪Filter cloth belt≫ The filter cloth belt 1 is an endless single conveyor belt capable of sequentially transferring the object to be dehydrated S1 and filtering it. The filter cloth belt 1 is formed of a felt material capable of filtering the object to be dehydrated S1. The filter cloth belt 1 is composed of, for example, an outer layer made of an ultrafine fiber layer constituting the upper surface, an inner layer made of a medium-fine fiber layer constituting the lower surface, and an intermediate layer made of a base cloth layer disposed between them, and is composed of a felt material having a three-layer structure. These outer layer, intermediate layer, and inner layer are joined so that the fibers are intertwined with each other by a process similar to carding.

[0019] As shown in Figure 1, the filter cloth belt 1 is wound sequentially from the lower squeeze bottom roll 82 to the guide roll 31, press bottom roll 52, underwater roll 72, felt roll 74, stretch roll 75, and felt roll 76, and then wound endlessly from the felt roll 76 back to the squeeze bottom roll 82. The filter cloth belt 1 is configured to be moved sequentially in the direction of the arrow at a transfer speed of about 5 to 50 m per minute by the clockwise rotation drive of the press bottom roll 52.

[0020] Slurry Supply Department The slurry supply unit 2 is a supply device for supplying the material to be dewatered S1, which is stored in a slurry concentration tank (not shown), onto the filter cloth belt 1 that is unwound from the squeezing unit 8. The slurry supply unit 2 is composed of a pump 21 for transferring the material to be dewatered S1 and a slurry supply pipe 22 for supplying the material to be dewatered S1 sent by the pump 21 onto the filter cloth belt 1.

[0021] ≪Negative pressure dewatering section≫ The negative pressure dewatering unit 3 is a dewatering device that applies suction negative pressure from a suction vacuum pump (not shown) from the lower side of the filter cloth belt 1 to the material to be dewatered S1 supplied to the upper side of the filter cloth belt 1 to perform initial dewatering of the material to be dewatered S1. The negative pressure dewatering unit 3 is composed of the filter cloth belt 1, a vacuum pump (not shown), and a guide roll 31.

[0022] The negative pressure dewatering unit 3 is preferably configured such that the suction negative pressure of a vacuum pump (not shown) acts on the lower surface of the filter cloth belt 1. In this case, the negative pressure dewatering unit 3 applies a weak suction force sufficient to cause moisture in the material to be dewatered S1 near the downstream side of the guide roll 31 on the filter cloth belt 1 to penetrate from the surface layer of the filter cloth belt 1 through the intermediate layer to the back layer. Alternatively, the negative pressure dewatering unit 3 is preferably configured to apply a suction negative pressure sufficient to draw and remove moisture in the material to be dewatered S1 to the lower surface of the filter cloth belt 1.

[0023] The press bottom roll 52 and the squeeze bottom roll 82 are spaced apart in the left-right direction. The guide roll 31 is positioned slightly above the midpoint between the press bottom roll 52 and the squeeze bottom roll 82. As shown in Figure 1, the filter cloth belt 1, whose inner surface is guided by the guide roll 31, is stretched between the press bottom roll 52 and the squeeze bottom roll 82 in a gently sloping V-shape. The filter cloth belt 1 is designed so that any misalignment in the width direction is corrected by the guide roll 31.

[0024] <Pressure-dehydrating transfer section> The pressurized dewatering and transfer unit 5 is a device for dewatering the material to be dewatered S1, which has been initially dewatered in the negative pressure dewatering unit 3, by compression. The pressurized dewatering and transfer unit 5 dewaters the material to be dewatered S1 on the filter cloth belt 1 by pressurizing it between a pair of rolls (press top roll 51 and press bottom roll 52), and transfers the dewatered material to be dewatered S1 (dewatered cake S2) to the circumferential surface of the upper press top roll 51. The press pressure by the press top roll 51 and press bottom roll 52 of the pressurized dewatering and transfer unit 5 is set to an appropriate pressure of 100 to 600 kPa by a pair of pressure adjustment units (not shown). The pressurized dewatering and transfer unit 5 is composed of a press top roll 51 (compression roll), a press bottom roll 52 (compression roll), a squeezing roll 53, and a rotation drive unit 54.

[0025] The press-top roll 51 and press-bottom roll 52 are a pair of upper and lower pressing rolls for compressing the material S1 to be dewatered on the filter cloth belt 1 to remove moisture. The ends of the shaft of the upper press-top roll 51 are rotatably supported. The outer surface of the press-top roll 51 (the surface that presses the filter cloth belt 1) is formed smoothly, for example, by hard chrome plating.

[0026] The press top roll 51 is driven to rotate in conjunction with the press bottom roll 52. The press top roll 51 is normally configured to rotate freely at the same peripheral speed as the press bottom roll 52 by frictional contact with the filter cloth belt 1 via the dewatered cake S2 ​​on the filter cloth belt 1.

[0027] The lower press bottom roll 52 has its shaft rotatably supported at both ends. The circumferential surface of the press bottom roll 52 around which the filter cloth belt 1 is wound is rubber-lined. Multiple drainage guide grooves (not shown) are formed on this rubber-lined circumferential surface. The depth, width, and pitch spacing of each drainage guide groove are set appropriately within a range that does not impair the function of the press bottom roll 52 in transporting the filter cloth belt 1. The rotation of the press bottom roll 52 is transmitted to the press top roll 51 via a transmission mechanism (not shown).

[0028] The squeezing roll 53 is a dewatering roll used to squeeze and remove moisture from the filter cloth belt 1 in conjunction with the press-top roll 51. The squeezing roll 53 is positioned between the guide roll 31 and the press-bottom roll 52, closer to the press-bottom roll 52, and consists of a roll with a smaller diameter than the press-top roll 51 and the press-bottom roll 52.

[0029] The rotary drive unit 54 rotates the press bottom roll 52. The rotary drive unit 54 is equipped with a motor with a reduction gear (not shown) as a drive source for rotating the press bottom roll 52. The press bottom roll 52 is rotated by the motor with a reduction gear (not shown) at a peripheral speed of about 5 to 50 m per minute.

[0030] ≪Sensor≫ As shown in Figure 1, the sensor 4 is a detector that detects the end portion S2a of the dewatered cake S2 ​​transferred onto the press-top roll 51, or the width dimension L of the dewatered cake S2. The sensor 4 can be any detector capable of detecting the end portion S2a of the dewatered cake S2, or the width dimension L of the dewatered cake S2, and its structure and type are not particularly limited. The sensor 4 can consist of, for example, a laser displacement sensor, a three-dimensional measuring machine, etc. The sensor 4 is more preferably a so-called ultra-high-definition inline profile measuring instrument, which has a high-performance laser light source, illumination / receiving lenses, and a CMOS (Complementary Metal-Oxide-Semiconductor) sensor mounted in the head. This ultra-high-definition inline profile measuring instrument is suitable for measuring the edges S2a and width L of the dewatered cake S2 ​​because it can measure without being affected by water vapor, dust, etc.

[0031] As shown in Figures 3 and 4, the sensor 4 is configured to include a sensor mounting bracket 41, connecting members 42 and 43, a bracket holding member 44, and an arm member 45. In this embodiment, as shown in Figure 2, two sensors 4 are arranged at each end of the press-top roll 51 so as to be able to detect the end S2 of the dewatered cake S2. However, a sensor capable of detecting the presence or absence of the dewatered cake S2 ​​across the entire width of the press-top roll 51 may also be arranged.

[0032] As shown in Figure 3 or Figure 4, the sensor mounting bracket 41 is a metal plate member to which the sensor 4 is attached. The sensor mounting bracket 41 consists of a member that is roughly L-shaped in cross-section. The connecting member 42 is a set of fasteners for connecting the sensor mounting bracket 41 and the bracket holding member 44. The connecting member 43 is a fastener for connecting the bracket holding member 44 and the arm member 45. The connecting members 42 and 43 consist, for example, of a bolt and a wing nut that screws onto the male threaded portion of the bolt.

[0033] The bracket holding member 44 is, for example, a metal member. The tip end of the bracket holding member 44 is connected to the sensor mounting bracket 41, and the base end of the bracket holding member 44 is connected to the arm member 45. The bracket holding member 44 consists of a member that is roughly U-shaped in cross-section. The arm member 45 is, for example, a metal member. The tip end of the arm member 45 is connected to the bracket holding member 44, and the base end of the arm member 45 is connected to the scraper mounting beam member 622. The arm member 45 consists of a flat member.

[0034] <<Processing Material Collection Department>> As shown in Figure 1, the processed material recovery unit 6 is a recovery device that scrapes off and recovers the dewatered cake S2 ​​that has been transferred to the circumferential surface of the press top roll 51. As shown in Figures 1, 3, or 4, the processed material recovery unit 6 is composed of a scraper 61, a scraper holder 62, a chute 63, and a recovery box 64.

[0035] As shown in Figures 3 and 4, the scraper 61 is a component for scraping off the dewatered cake S2 ​​adhering to the circumferential surface of the press-top roll 51, and is arranged across the entire width of the press-top roll 51. The scraper 61 is made of a substantially knife-shaped metal plate member and is supported by the scraper holding portion 62. In this embodiment, the upper end of the scraper 61 is connected to the lower edge portion 621a of the scraper holding member 621 by a connector 611. The connector 611 is made of, for example, a screw member.

[0036] The scraper holding section 62 is a holding means for holding the scraper 61 in a preset position. The scraper holding section 62 comprises a scraper holding member 621, a scraper mounting beam member 622, and connectors 623 and 624.

[0037] The scraper holding member 621 holds the base end (upper end) of the scraper 61. As shown in Figure 3, the scraper holding member 621 consists of a member that is approximately T-shaped when viewed from the front, having an upper side portion 621b and a lower side portion 621a. As shown in Figure 4, the scraper holding member 621 is formed in a horizontally elongated shape that is long in the front-to-back direction (width direction of the press-top roll 51) when viewed from the side, and is arranged parallel to the rotation axis of the press-top roll 51.

[0038] As shown in Figure 3, the scraper mounting beam member 622 is a member for supporting the scraper holding member 621 and the arm member 45, and is fixed to a frame or building structure (not shown), for example. The scraper mounting beam member 622 is made of, for example, an H-shaped steel and has an upper side portion 622a, a lower side portion 622b, and an upper and lower connecting side portion 622c that connects the upper side portion 622a and the lower side portion 622b. As shown in Figure 4, the scraper mounting beam member 622 is formed in a horizontally elongated shape that is long in the front-to-back direction (width direction of the press-top roll 51) when viewed from the side, and is arranged parallel to the rotation axis of the press-top roll 51.

[0039] As shown in Figure 3, the upper part 621b of the scraper holding member 621 is fixed to the lower part 622b of the scraper mounting beam member 622 by a connector 623. Furthermore, the arm member 45 and the upper part 621b of the scraper holding member 621 are fixed to the lower part 622b of the scraper mounting beam member 622 by a connector 624.

[0040] The connectors 623 and 624 consist of, for example, bolts and nuts. As shown in Figure 1, the chute 63 is a guide member for dropping (transporting) the cake-like dewatered cake S2 ​​scraped off by the scraper 61 towards the collection box 64. The chute 63 consists of a plate-like member positioned below the scraper 61. The upper side of the chute 63 is positioned toward the press-top roll 51, and the lower side is positioned toward the top of the collection box 64.

[0041] The collection box 64 is a container for holding the dewatered cake S2 ​​scraped off the press-top roll 51. The collection box 64 is located below the scraper 61. The scraper 61, chute 63, and collection box 64 have widths corresponding to the lengths of the press-top roll 51 and press-bottom roll 52.

[0042] ≪Cleaning Section≫ The washing unit 7 is a washing device for washing the filter cloth belt 1 from which the dewatered cake S2 ​​has been removed. The washing unit 7 is composed of a washing pool 71, an underwater roll 72, a water washing shower 73, a felt roll 74, a stretch roll 75, and a felt roll 76.

[0043] The washing pool 71 is a washing water storage tank for storing washing water used to wash the filter cloth belt 1. An underwater roll 72 is placed inside the washing pool 71. A chute (not shown) extending below the constriction section 8 may be provided in the washing pool 71 to collect water dripping from the constriction section 8 into the washing pool 71.

[0044] The underwater roll 72 is a roll that guides the filter cloth belt 1, which is unwound from the press bottom roll 52, to be immersed in the washing water in the washing pool 71. The underwater roll 72 is located in the washing pool 71 of the washing section 7, which is positioned below the guide roll 31.

[0045] The water washing shower 73 is a water spraying device that sprays washing water onto the front and back surfaces of the filter cloth belt 1 to clean it. The water washing shower 73 is installed separately on the front and back surfaces of the filter cloth belt 1, which is positioned upward from the underwater roll 72 toward the felt roll 74 above it.

[0046] The felt roll 74 is a roll that guides the filter cloth belt 1 so that it is pulled diagonally upward from within the washing pool 71. The felt roll 74 is positioned above the underwater roll 72. The stretch roll 75 is a roll that presses the filter cloth belt 1 upward to remove any slack in the filter cloth belt 1. The stretch roll 75 is positioned diagonally above and to the right of the felt roll 74.

[0047] The felt roll 76 is a roll that presses the filter cloth belt 1 upward. The felt roll 76 is positioned between the squeeze bottom roll 82 and the stretch roll 75.

[0048] <<Squeezing section>> The squeezing section 8 is a device for squeezing the washed filter cloth belt 1. The squeezing section 8 includes a squeezing top roll 81 and a squeezing bottom roll 82 for dewatering to squeeze and remove the moisture of the filter cloth belt 1 containing washing water. The pressing pressure of the squeezing top roll 81 and the squeezing bottom roll 82 is adjusted to a magnitude sufficient to squeeze moisture from the washed filter cloth belt 1.

[0049] <<Control device>> As shown in FIG. 1 or FIG. 2, the control device 9 is a device for determining the state of the dewatered cake S2 based on the detection result of the sensor 4. When the control device 9 determines from the detection result of the sensor 4 that has detected the end portion S2a or the width dimension L of the dewatered cake S2 transferred onto the press top roll 51 that the dewatered cake S2 has deviated from a preset predetermined standard, it adjusts the supply amount of the material to be dewatered S1 from the slurry supply section 2 or the moving speed of the filter cloth belt 1, and performs control to adjust so that the end portion S2a of the dewatered cake S2 satisfies the standard.

[0050] When the control device 9 monitors the position of the end portion S2a of the dewatered cake S2, for example, a reference position E is set at the end of the press top roll 51 out and at the same time, E is set at a position inward by a predetermined distance from the reference position E out When the end portion S2a that was located between the reference position E in and the reference position E out exceeds the reference position E in out , at least one of the control to decrease the supply amount of the material to be dewatered S1 from the slurry supply section 2 and the control to accelerate the moving speed of the filter cloth belt 1 is executed. Also, when the end portion S2a that was located between the reference position E out and the reference position E in exceeds the reference position E in , at least one of the control to increase the supply amount of the material to be dewatered S1 from the slurry supply section 2 and the control to decelerate the moving speed of the filter cloth belt 1 is executed.

[0051] ​When the control device 9 monitors the width dimension L of the dewatered cake S2, for example, the maximum reference width dimension L max and minimum reference width dimension L min Set the width dimension L to the maximum reference width dimension L max If the value exceeds the minimum reference width L, at least one of the following controls will be executed: reduce the amount of material to be dewatered S1 supplied from the slurry supply unit 2, and accelerate the movement speed of the filter cloth belt 1. min If the level falls below a certain point, either control is executed to increase the amount of material to be dewatered S1 supplied from the slurry supply unit 2, or control is executed to reduce the movement speed of the filter cloth belt 1.

[0052] Furthermore, monitoring of the end portion S2a of the dewatered cake S2 ​​and monitoring of its width dimension may be performed in combination. For example, if the width dimension L of the dewatered cake S2 ​​is the maximum reference width dimension L max and minimum reference width dimension L min The amount of material to be dewatered S1 and the moving speed of the filter cloth belt 1 are controlled to stay within the range, and at one of the ends S2a, S2a is at the reference position E out When this value is exceeded, at least one of the following may be forcibly implemented: a control to reduce the amount of material to be dewatered S1 supplied from the slurry supply unit 2, and a control to accelerate the movement speed of the filter cloth belt 1.

[0053] ≪Effect≫ Next, the operation of the dewatering apparatus 100 and dewatering method according to the embodiment will be explained with reference to Figures 1 to 4. First, the power switch (not shown) is turned ON to drive the pump 21 as shown in Figure 1. The pump 21 sequentially and continuously supplies the slurry-like material to be dewatered S1 onto the filter cloth belt 1 between the guide roll 31 and the squeezing roll 53 via the slurry supply pipe 22 (material to be dewatered supply process).

[0054] The filter cloth belt 1 is moved in the transport direction (direction of arrow a) by a press bottom roll 52 which is rotationally driven by a rotary drive unit 54. When the press bottom roll 52 is rotationally driven by the rotary drive unit 54 in the transport direction of the filter cloth belt 1, the guide roll 31, the squeezing roll 53 and the press top roll 51 rotate in accordance with the filter cloth belt 1.

[0055] When the material to be dewatered S1 supplied onto the filter cloth belt 1 passes through the negative pressure dewatering section 3, a suction negative pressure is applied from the underside of the filter cloth belt 1, causing the moisture in the material to permeate the filter cloth belt 1. At this time, the material to be dewatered S1 is filtered by the outer layer (not shown) of the filter cloth belt 1, which consists of an ultrafine fiber layer, allowing only the moisture to pass through through capillary action. In addition, the inner layer, which consists of an intermediate layer made of a medium-fine fiber layer and a base fabric layer of the filter cloth belt 1, promotes the permeation of moisture (water drainage), thus performing the dewatering treatment. The material to be dewatered S passes through the negative pressure dewatering section 3 together with the filter cloth belt 1 and is transferred to the pressurized dewatering transfer section 5.

[0056] The material to be dewatered S1 on the filter cloth belt 1 is first dewatered by pressure in the pressurized dewatering transfer section 5 by passing between the guide roll 31 and the press bottom roll 52. Furthermore, the material to be dewatered S1 is dewatered by pressure by passing between the press top roll 51 and the press bottom roll 52 (dewatered material compression process).

[0057] Furthermore, the press bottom roll 52, which is pressed against the filter cloth belt 1, has multiple water drainage guide grooves (not shown) formed on its circumferential surface that promote water drainage from the filter cloth belt 1, thereby promoting pressurized dewatering of the material to be dewatered S1 and generating a dewatered cake S2. The press top roll 51, which is pressed against the material to be dewatered S, has a smooth circumferential surface, so it transfers the dewatered cake S2 ​​to it and separates it from the filter cloth belt 1. As a result, the dewatered cake S2 ​​adheres to the outer surface of the press top roll 51.

[0058] The dewatered cake S2 ​​that has transferred to the circumferential surface of the press-top roll 51 is scraped off by the scraper 61 of the processed material recovery unit 6. As shown in Figure 2, before the dewatered cake S2 ​​that has transferred to the press-top roll 51 is scraped off by the scraper 61, the edge S2a or width dimension L of the dewatered cake S2 ​​is measured by the sensor 4 (dewatered cake measurement process).

[0059] The control device 9 (see Figure 1) uses the sensor 4 to monitor whether the end portion S2a or width dimension L of the dewatered cake S2 ​​is within a preset standard or outside the standard width (monitoring process). Furthermore, if the control device 9 (see Figure 1) determines from the detection results of the sensor 4 that the end portion S2a or width dimension L of the dewatered cake S2 ​​is outside the standard, it automatically adjusts the supply amount of the material to be dewatered S1 or the movement speed of the filter cloth belt 1 (adjustment step). In other words, the control device 9 (see Figure 1) adjusts the end portion S2a or width dimension L of the dewatered cake S2 ​​so that it is within a predetermined standard by automatically adjusting the supply amount of the material to be dewatered S1 or the movement speed of the filter cloth belt 1.

[0060] Specifically, the control device 9 adjusts the supply amount of the material to be dewatered S1 by setting the pump 21 to a desired rotational speed, and adjusts the movement speed of the filter cloth belt 1 to a desired rotational speed by adjusting the rotational speed of the rotary drive unit 54. As a result, the end S2a of the dewatered cake S2 ​​can always be kept within a predetermined standard.

[0061] As shown in Figure 1, the dewatered cake S2 ​​scraped off by the scraper 61 is collected into the collection box 64 via the chute 63. The filter cloth belt 1, from which the dewatered cake S2 ​​has been detached after passing through the pressurized dewatering transfer section 5, is washed by the washing section 7 and squeezed by the squeezing section 8 in order to allow a new material to be dewatered S1 to be supplied to its upper surface.

[0062] More specifically, the filter cloth belt 1, having passed through the pressurized dewatering transfer section 5, is immersed in the washing water in the washing pool 71 of the washing section 7 and washed. Subsequently, the filter cloth belt 1 moves upward so as to be lifted out of the washing water in the washing pool 71, and the washing water from the washing shower 73 is sprayed onto its outer and inner surfaces for washing.

[0063] The washed filter cloth belt 1 is sent to the squeezing section 8 via felt roll 74, stretch roll 75, and felt roll 76. The filter cloth belt 1 sent to the squeezing section 8 passes between the squeeze top roll 81 and the squeeze bottom roll 82, where a predetermined press pressure is applied, squeezing it to a degree that maintains capillary action. After passing through the squeezing section 8, the filter cloth belt 1 returns to the original negative pressure dewatering section 3, and the above process is repeated.

[0064] As shown in Figure 1 or 2, the dewatering device 100 includes a filter cloth belt 1 for sequentially transporting slurry-like or sludge-like material to be dewatered S1, a slurry supply unit 2 for supplying the material to be dewatered S1 onto the filter cloth belt 1, compression rolls (press top roll 51 and press bottom roll 52) for compressing the material to be dewatered S1 on the filter cloth belt 1, a sensor 4 for detecting the end portion S2a of the dewatered cake S2 ​​transferred onto the compression rolls or the width dimension L of the dewatered cake S2, and a control device 9 for determining the state of the dewatered cake S2 ​​based on the detection result of the sensor 4. If the control device 9 determines, based on the detection result of the sensor 4, that the dewatered cake S2 ​​has deviated from a preset standard, it controls the supply amount of the slurry supply unit 2 or the movement speed of the filter cloth belt 1 to adjust the end portion S2a of the dewatered cake S2 ​​to meet the standard.

[0065] In this configuration, the sensor 4 detects the end portion S2a of the dewatered cake S2 ​​transferred onto the compression roll (press-top roll 51) or the width dimension of the dewatered cake S2. The control device 9 can monitor whether the supply amount of the slurry supply unit 2 or the width dimension L of the dewatered cake S2 ​​is within a predetermined standard based on the detection result of the sensor 4. If the width of the end portion S2a of the dewatered cake S2 ​​falls outside the standard width, the control device 9 adjusts the supply amount of the slurry supply unit 2 or the movement speed of the filter cloth belt 1 to adjust the end portion S2a of the dewatered cake S2 ​​to meet the standard. In this way, the dewatering device 100 can adjust the end portion S2a of the dewatered cake S2 ​​to stay within the standard when dewatering the material to be dewatered S1 with a pair of compression rolls (press-top roll 51 and press-bottom roll 52).

[0066] Furthermore, as shown in Figures 1, 3, or 4, the sensor 4 is connected to the scraper holding portion 62 of the scraper 61, which peels off the dewatered cake S2 ​​adhering to the compression roll (press-top roll 51).

[0067] In this configuration, since the sensor 4 is connected to the scraper holding part 62, the sensor 4 can be positioned near the end S2a of the dewatered cake S2, thereby enabling accurate measurement of the end width of the dewatered cake S2.

[0068] Furthermore, the sensor 4 shown in Figure 1 or Figure 2 consists of a laser displacement sensor. In this configuration, by using a laser displacement sensor as sensor 4, it becomes possible to measure the width, shape, material condition, etc., of the end portion S2a of the dewatered cake S2 ​​with high precision.

[0069] Furthermore, the dewatering method according to this embodiment, as shown in Figure 1 or Figure 2, comprises the steps of supplying a slurry or sludge-like material to be dewatered S1 onto a filter cloth belt 1 on which the material can be transported, and compressing the material to be dewatered S1 on the filter cloth belt 1 with a compression roll (Press Top Roll 51). In this dewatering method, the end portion S2a or width dimension L of the dewatered cake S2 ​​transferred onto the compression roll (Press Top Roll 51) is detected, and the amount of material to be dewatered S1 supplied or the movement speed of the filter cloth belt 1 is adjusted so that the width meets a preset standard.

[0070] In this configuration, the sensor 4 detects the edge S2a of the dewatered cake S2, and the detection result is used to monitor whether the edge S2a or width L of the dewatered cake S2 ​​is outside a preset standard. If the edge S2a or width L of the dewatered cake S2 ​​is outside the standard, the supply amount of the material to be dewatered S1 or the movement speed of the filter cloth belt 1 is adjusted to bring it within the predetermined standard. In this way, when the material to be dewatered S1 is dewatered by a pair of compression rolls, the edge S2a or width L of the dewatered cake S2 ​​can be kept within the standard.

[0071] [Differentiation] It should be noted that the present invention is not limited to the embodiments described above, and various modifications and changes are possible within the scope of its technical concept. Naturally, the present invention also extends to such modified and altered inventions.

[0072] In the above embodiment, an example of a dewatered product S1 was described as the case in which a product containing solid particles of incinerated fly ash is concentrated. However, this method can also be applied to the concentration of a turbid liquid in which solid particles such as ceramics, sludge, and minerals such as soil and rock are suspended in the liquid. [Explanation of Symbols]

[0073] 1. Filter cloth belt 2. Slurry supply unit 4 sensors 9 Control device 21. Liquid supply pump 51 Press-top roll 51 (compression roll) 52 Press Bottom Roll 52 (Compression Roll) 61 Scraper 62 Scraper holding part 100 Dehydration equipment L Width dimension S1 Dehydrated material S2 Dehydrated Cake S2a End

Claims

1. A filter cloth belt that sequentially transports slurry-like or sludge-like material to be dewatered, A slurry supply unit that supplies the material to be dewatered onto the filter cloth belt, A compression roll for compressing the material to be dewatered on the filter cloth belt, A sensor for detecting the edge of the dewatered cake rolled onto the compression roll or the width dimension of the dewatered cake, A dewatering apparatus comprising a control device that determines the state of the dewatered cake based on the detection result of the sensor, Based on the detection results of the sensor, if the control device determines that the dewatered cake has deviated from a preset standard, it adjusts the supply amount of the slurry supply unit or the movement speed of the filter cloth belt to adjust the end of the dewatered cake to meet the standard. Dehydration equipment.

2. The sensor is connected to the scraper holding portion of the scraper that peels off the dewatered cake adhering to the compression roll. The dewatering apparatus according to claim 1.

3. The sensor consists of a laser displacement sensor. A dewatering apparatus according to claim 1 or claim 2.

4. A step of supplying the material to be dewatered, which is in the form of a slurry or sludge, onto a filter cloth belt that can transport the material to be dewatered, A dewatering method comprising the step of compressing the material to be dewatered on the filter cloth belt with a compression roll, The system detects the edge or width of the dewatered cake transferred onto the compression roll and adjusts the supply amount of the material to be dewatered or the movement speed of the filter cloth belt so that the width meets a preset standard. Dehydration method.

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