System and method for treating water slurry

Abstract

The present application relates to the field of water slurry treatment, and particularly relates to a system and method for treating water slurry, which comprises: n water slurry treatment towers which are identical and arranged in a ring shape, n>=2, wherein at least one water slurry treatment tower is arranged as an empty tower without packing, and the rest of the water slurry treatment towers are filled with packing to form a packed tower for water slurry purification; two adjacent water slurry treatment towers are connected through a packing inclined pipe; at least one inlet and outlet is arranged on the upper and bottom part of the tower body of each water slurry treatment tower; and a spiral belt which extends axially is arranged on the central axis of each water slurry treatment tower. The system and method of the present application save the packing cleaning time, reduce the water consumption for cleaning the packing, and improve the water slurry treatment efficiency.

Description

Technical Field

[0001] This invention relates to the field of water slurry treatment, and more specifically to systems and methods for treating water slurry. Background Technology

[0002] Packed filter media is commonly used in industrial and domestic water purification processes. It purifies water by trapping impurities in the water through the gaps between the packing media. As impurities accumulate in the gaps between the packing media, the resistance of the packing bed increases, leading to a decrease in the purifier's throughput and instability in its treatment effect. Therefore, backflushing and regeneration of the packing bed are necessary to reduce bed resistance and ensure stable operation of the purifier.

[0003] The existing technology for regenerating packed bed purifiers mainly uses backwash water or gas injected from the bottom of the bed to disturb the bed. (1) When the amount of backwash water or gas is small, the disturbance of the packing in the bed is not intense enough, so it is impossible to achieve effective bed regeneration. (2) When the amount of backwash water or gas is large, the packing will be carried out from the slurry pipeline outlet, causing the packing to run away. (3) A high backwash water flow rate will cause excessive water consumption, which is not conducive to energy saving and consumption reduction. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of incomplete regeneration process, excessive water and gas consumption in existing packed bed purifiers, and to provide a system and method for treating water slurry. This invention consists of multiple sets of water slurry treatment towers to form a water slurry treatment system, which can significantly improve the efficiency and filtration effect of water slurry treatment. Furthermore, the method of this invention utilizes the axial flow generated by the rotation of the spiral ribbon in the water slurry treatment tower to lift the packing. Backwash water is introduced into the bottom inlet and outlet of the tower to separate the packing from the solid impurities trapped in the packing, thereby realizing the cyclic regeneration of the packing.

[0005] To achieve the above objectives, the present invention provides a system for treating water slurry, the system comprising: n identical water slurry treatment towers arranged in a ring, n≥2, wherein at least one water slurry treatment tower is configured as an empty tower without packing 5, and the remaining water slurry treatment towers are filled with packing 5 to form a packed tower 1 for water slurry purification. The two adjacent water slurry treatment towers are connected by a packing inclined tube 10, and each water slurry treatment tower has at least one inlet and outlet at the top and bottom of the tower body; Each water slurry treatment tower has an axially spirally extending spiral ribbon 4 installed on its central axis.

[0006] A second aspect of the present invention provides a method for treating water slurry, using the system described in the present invention, the method comprising: 1) Slurry treatment stage: A. The water slurry to be treated is fed into the packed tower 1 through the inlet and outlet at the top of the tower body, and the purified water after being treated by the packing 5 is discharged through the inlet and outlet at the bottom of the tower body. B. Along the flow direction of packing 5, when the pressure difference between the upper and lower parts of the previous packed tower 1 is greater than the set value or the water slurry treatment time is greater than the set value, step 2) is used to clean the packing 5; C. Repeat steps A through B; 2) Packing material cleaning stage 5: I. Backwash water is introduced from the bottom inlet and outlet of the previous packed tower 1 in the empty tower; II. The screw ribbon 4 in the preceding packed tower 1 of the empty tower rotates, causing the packing 5 in the tower to flow upward. The packing 5 enters the empty tower through the packing inclined tube 10. Solid impurities in the packing 5 are discharged from the upper inlet and outlet of the tower body by the action of backwash water flow. III. Backwash water is introduced from the bottom inlet and outlet of the empty tower, and the slurry that enters the empty tower along with the packing 5 is discharged from the top inlet and outlet of the empty tower. IV. When the cleaning time of packing 5 reaches the set value, the previous packing tower 1 becomes an empty tower, and the original empty tower becomes the packing tower 1 used for water slurry purification; the screw ribbon 4 stops rotating and the backwash water feeding stops.

[0007] The present invention has at least the following beneficial effects: The water slurry treatment system is composed of multiple water slurry treatment towers, which can greatly improve the efficiency of water slurry treatment and filtration effect. When cleaning the packing, the vertical upward axial flow disturbance is generated by the screw ribbon to achieve sufficient disturbance of the packing bed to improve the cleaning effect and reduce the water consumption in the packing cleaning process. After cleaning, the packing enters the empty tower through the inclined tube for reuse in water slurry purification, realizing the recycling and regeneration of the packing. When n>2, water slurry purification and packing cleaning can be carried out simultaneously, saving the time of cleaning the packing and improving the efficiency of water slurry treatment. (4) Set the upper and lower pressure difference value and water slurry treatment time to ensure that the system operation is more stable in the water slurry treatment process. Attached Figure Description

[0008] Figure 1 This is a front view of the empty tower and the preceding packed tower in the packing cleaning stage of the water slurry treatment system in a preferred embodiment of the present invention.

[0009] Figure 2 This is a top view of the empty tower and the preceding packed tower in the packing cleaning stage of the water slurry treatment system in a preferred embodiment of the present invention.

[0010] Figure 3 This is a top view of a water slurry treatment system with n=3 in a preferred embodiment of the present invention.

[0011] Figure 4This is a top view of a water slurry treatment system with n=4 in a preferred embodiment of the present invention.

[0012] Figure 5 This is a top view of a water slurry treatment system with n=5 in a preferred embodiment of the present invention.

[0013] Explanation of reference numerals in the attached figures 1. Packed tower 2. Power unit 3. Rotating shaft 4. Screw ribbon 5. Packing material 6.1 Water grout pipeline 6.2 Water Slurry Inlet 6.3 Water slurry pipeline valve 7.1 Purified water pipeline 7.2 Purified water outlet 7.3 Purified water pipeline valves 8.1 Backflush water pipeline 8.2 Backflushing water inlet 8.3 Backflush water pipeline valve 9.1 Slurry Piping 9.2 Slurry outlet 9.3 Slurry Pipeline Valves 10. Packing inclined tube 11. Inclined pipe valve Detailed Implementation The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0014] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" generally refer to the upper, lower, left, and right positions shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer positions relative to the outline of each component itself; and "upper," "lower," "top," and "bottom" are generally descriptive terms describing the relative positions of the components in relation to the directions shown in the accompanying drawings or in relation to the vertical, perpendicular, or gravitational directions.

[0015] In some embodiments of the present invention, an electric motor is used as the power unit, but this does not limit the scope of the present invention.

[0016] According to one aspect of the present invention, a system for treating water slurry is provided, such as Figures 1-5 As shown, the system includes: n identical water slurry treatment towers arranged in a ring, n≥2, wherein at least one water slurry treatment tower is set as an empty tower without packing 5, and the remaining water slurry treatment towers are filled with packing 5 to form a packed tower 1 for water slurry purification. The two adjacent water slurry treatment towers are connected by a packing inclined tube 10, and each water slurry treatment tower has at least one inlet and outlet at the top and bottom of the tower body; Each water slurry treatment tower has an axially spirally extending spiral ribbon 4 installed on its central axis.

[0017] In this invention, n identical water slurry treatment towers are arranged in a ring, where n≥2; at least one water slurry treatment tower is set as an empty tower without packing material 5. When the pressure difference between the upper and lower parts of the previous packed tower 1 is greater than a set value or the water slurry treatment time is greater than a set value, the packing material 5 can be cleaned and transferred to release its working pressure, which can increase the service life of the water slurry treatment tower and reduce the occurrence of failures. When n>2, the cleaning of the packing material 5 and the water slurry treatment can be carried out simultaneously, saving the cleaning time of the packing material 5 and improving the water slurry treatment efficiency.

[0018] In one embodiment of the present invention, a rotating shaft 3 can be placed on the central axis of each water slurry treatment tower to set an axially spirally extending spiral ribbon 4. The rotating shaft is connected to a power device 2. The power device 2 can be a motor or the like to control the rotation of the rotating shaft 3 to make the spiral ribbon 4 rotate to generate a vertically upward axial flow or to rotate in the opposite direction to make the spiral ribbon 4 rotate to generate a vertically downward axial flow, but this does not limit the scope of the present invention.

[0019] According to one embodiment of the present invention, along the flow direction of the packing 5, in two adjacent water slurry treatment towers, the packing inclined tube 10 extends obliquely downward from the side of the previous water slurry treatment tower and connects to the side of the next water slurry treatment tower, and the packing inclined tube 10 of the last water slurry treatment tower extends obliquely downward from the side and connects to the first water slurry treatment tower.

[0020] According to one embodiment of the present invention, the angle between the packing inclined tube 10 and the vertical direction is in the range of 20°-80°, preferably 45°-75°.

[0021] According to one embodiment of the present invention, a control valve is provided on the packing inclined tube 10 for controlling the connection and closure of the packing inclined tube 10. This embodiment can prevent the packing 5 of two adjacent slurry treatment towers from crossing during system operation.

[0022] According to one embodiment of the present invention, the horizontal line at the upper end of the screw ribbon 4 is not higher than the upper end connection port of the packing inclined tube 10; the horizontal line at the lower end of the screw ribbon 4 is not lower than the lower end of the packing 5 inside the packing tower 1.

[0023] According to one embodiment of the present invention, the diameter of the screw ribbon 4 projected onto the horizontal plane is... d Diameter of packed tower 1 D The ratio is 0.8~0.98:1, which is preferred. d / D = 0.9~0.95:1.

[0024] According to one embodiment of the present invention, the working material level of the packing 5 is... H It is 1-3 m.

[0025] According to one embodiment of the present invention, the pitch of the screw ribbon 4 h Working material level of packing 5 H The ratio is 0.1~0.3:1, preferably. h / H = 0.125~0.25:1.

[0026] In this invention, the inlet and outlet of the slurry treatment tower are connected to inlet and outlet pipelines to facilitate the entry and exit of materials, but this does not limit the scope of the invention. According to one embodiment of the invention, control valves are provided at the connection points between each inlet and outlet pipeline and the inlet and outlet of each slurry treatment tower to control the connection and closure of each inlet and outlet with the pipeline. The above embodiment can be used to control the operating status of each slurry treatment tower.

[0027] According to one embodiment of the present invention, the horizontal line of the upper inlet and outlet of the water slurry treatment tower is not lower than the upper end connection port of the packing inclined tube 10, and the bottom inlet and outlet of the water slurry treatment tower is not higher than the lower end point of the packing 5 inside the water slurry treatment tower. This allows the slurry to be fully filtered through the packing 5, thus avoiding both incomplete water slurry purification and backflow of the filtered purified water through the packing 5.

[0028] According to one embodiment of the present invention, each water slurry treatment tower has two inlets and outlets at the top and bottom of the tower body for different material flows.

[0029] According to one embodiment of the present invention, the inlet and outlet at the top of each water slurry treatment tower includes: a water slurry inlet 6.2 for feeding the water slurry to be treated.

[0030] According to one embodiment of the present invention, the inlet and outlet at the top of each water slurry treatment tower includes a slurry outlet 9.2 for discharging the slurry generated from cleaning the packing 5.

[0031] According to one embodiment of the present invention, the inlet and outlet at the bottom of each water slurry treatment tower includes a purified water outlet 7.2 for discharging purified water after water slurry purification.

[0032] According to one embodiment of the present invention, the inlet and outlet at the bottom of each water slurry treatment tower includes: a backflushing water inlet 8.2 for backflushing water used to feed and clean the packing 5.

[0033] In one embodiment, the system of the present invention further includes: a water slurry pipeline 6.1, which is divided into multiple branches and connected to the water slurry inlet 6.2 at the top of the tower body of each water slurry treatment tower.

[0034] According to one embodiment of the present invention, a water slurry pipeline valve 6.3 is arranged on each branch of the water slurry pipeline 6.1.

[0035] In one embodiment, the system of the present invention further includes: a purified water pipeline 7.1, which is divided into multiple branches and connected to the purified water outlet 7.2 at the bottom of the tower body of each water slurry treatment tower.

[0036] According to one embodiment of the present invention, a purified water pipeline valve 7.3 is arranged on each branch of the purified water pipeline 7.1.

[0037] In one embodiment, the system of the present invention further includes: a slurry pipeline 9.1, which is divided into multiple branches and connected to the slurry outlet 9.2 at the top of each slurry treatment tower.

[0038] According to one embodiment of the present invention, a slurry pipeline valve 9.3 is arranged on each branch of the slurry pipeline 9.1.

[0039] In one embodiment, the system of the present invention further includes: a backwash water pipeline 8.1, which is divided into multiple branches and connected to the backwash water inlet 8.2 at the bottom of the tower body of each slurry treatment tower.

[0040] According to one embodiment of the present invention, a backflush water valve 8.3 is arranged on each branch of the backflush water pipeline 8.1. A second aspect of the present invention provides a method for treating water slurry, using the system described in the present invention, the method comprising: 1) Slurry treatment stage: A. The water slurry to be treated is fed into the packed tower 1 through the inlet and outlet at the top of the tower body, and the purified water after being treated by the packing 5 is discharged through the inlet and outlet at the bottom of the tower body. B. Along the flow direction of packing 5, when the pressure difference between the upper and lower parts of the previous packed tower 1 is greater than the set value or the water slurry treatment time is greater than the set value, step 2) is used to clean the packing 5; C. Repeat steps A through B; 2) Packing material cleaning stage 5: I. Backwash water is introduced from the bottom inlet and outlet of the previous packed tower 1 in the empty tower; II. The screw ribbon 4 in the preceding packed tower 1 of the empty tower rotates, causing the packing 5 in the tower to flow upward. The packing 5 enters the empty tower through the packing inclined tube 10. Solid impurities in the packing 5 are discharged from the upper inlet and outlet of the tower body by the action of backwash water flow. III. Backwash water is introduced from the bottom inlet and outlet of the empty tower, and the slurry that enters the empty tower along with the packing 5 is discharged from the top inlet and outlet of the empty tower. IV. When the cleaning time of packing 5 reaches the set value, the previous packing tower 1 becomes an empty tower, and the original empty tower becomes the packing tower 1 used for water slurry purification; the screw ribbon 4 stops rotating and the backwash water feeding stops.

[0041] In this invention, the inventors discovered that engineering designs typically allow for a certain margin. Under normal circumstances, this invention triggers the next stage when the slurry treatment time exceeds a set value. However, to prevent abnormalities due to certain fluctuating working conditions, in this invention, when the pressure difference between the upper and lower pressures exceeds a set value before the slurry treatment time exceeds a set value, the pressure difference exceeding the set value is taken as the time when the cleaning of packing material 5 begins. Otherwise, the time when the slurry treatment time exceeds the set value is used as the time when the cleaning of packing material 5 begins.

[0042] In this invention, when using the system of this invention, at least one water slurry treatment tower is set as an empty tower without packing material 5. When the pressure difference between the upper and lower parts of the previous packed tower is greater than a set value or the water slurry treatment time is greater than a set value, the packing material 5 can be cleaned and transferred, releasing its working pressure, increasing the service life of the water slurry treatment tower, reducing the occurrence of failures, and improving the filtration effect. When n>2, the cleaning of the packing material 5 and the water slurry treatment can be carried out simultaneously, saving the cleaning time of the packing material 5 and improving the efficiency of water slurry treatment. At the same time, the vertical upward axial flow disturbance generated by the screw ribbon can achieve sufficient disturbance of the packing material 5 bed, improve the regeneration effect, and reduce the water consumption of backwash water.

[0043] According to a preferred embodiment of the present invention, after the backwash water stops in step IV, the screw ribbon 4 is rotated in the reverse direction to generate a vertically downward axial flow to compact the packing 5. When the compaction time of the packing 5 reaches a set value, the screw ribbon 4 stops rotating.

[0044] In this invention, the packing 5 enters the empty tower through the packing inclined tube 10. Due to gravity, the packing 5 falls freely to the bottom of the empty tower and accumulates continuously. The inventors found that in actual devices, it is impossible to judge the working material level and compaction status of the packing 5 in the device, and it is not very meaningful to compact the packing before the end of the cleaning time. Therefore, after the backflushing water stops in step IV, the packing 5 is compacted, and the compaction time of the packing 5 is set so that the screw ribbon 4 can rotate in the opposite direction to remove the voids in the packing 5 bed, providing better conditions for the next purification stage.

[0045] In one embodiment of the present invention, the water slurry treatment tower has two inlets and two outlets at the top and bottom of the tower body.

[0046] According to one embodiment of the present invention, the slurry to be treated is fed into the tower body through the slurry inlet 6.2 at the top of the tower body.

[0047] According to one embodiment of the present invention, the purified water after water slurry purification is discharged from the purified water outlet 7.2 at the bottom of the tower.

[0048] According to one embodiment of the present invention, backwash water for cleaning the packing 5 is introduced from the backwash water inlet 8.2 at the bottom of the tower body.

[0049] According to one embodiment of the present invention, the slurry generated from cleaning the packing 5 is discharged from the slurry outlet 9.2 at the top of the tower.

[0050] According to one embodiment of the present invention, the pressure difference between the upper and lower parts of the preceding packed tower 1 is set to 200-500 kPa.

[0051] According to one embodiment of the present invention, the water slurry treatment time of the preceding packed tower 1 of the empty tower is set to 4-120h.

[0052] According to one embodiment of the present invention, the flow rate of the backwash water is 0.5-3 mm / s, preferably 1-1.5 mm / s.

[0053] In this invention, the packing 5 bed is fully disturbed under the condition of low backwash water flow to improve the regeneration effect, which not only avoids the packing 5 being carried out by excessive backwash water flow, but also saves backwash water consumption.

[0054] According to one embodiment of the present invention, the rotation speed of the spiral ribbon 4 in the preceding packed tower 1 of the empty tower is 0.1-5 rpm, preferably 0.5-3 rpm; under the condition of low stirring speed and low backwash water flow, the lifting speed of the packing 5 is more gentle and controllable, and the packing 5 will not be carried out from the upper inlet and outlet of the packed tower 1 due to excessively fast rising speed.

[0055] According to one embodiment of the present invention, the cleaning time of packing 5 in step IV is set to 15-60 min.

[0056] In this invention, the lifting speed of packing 5 is calculated using the following formula: v = h · n in v The speed at which the screw ribbon 4 advances axially, in m / min; n is the rotational speed of the screw ribbon 4, in r / min, and h is the pitch of the screw ribbon 4, in m.

[0057] According to one embodiment of the present invention, the rotational speed of the screw ribbon 4 of the empty tower in the reverse direction is 0.1-3 revolutions per minute, preferably 0.5-2 revolutions per minute.

[0058] According to one embodiment of the present invention, the time setting for compacting the packing 5 is 1-5 min, preferably 1-2 min.

[0059] According to a preferred embodiment of the present invention, such as Figure 1 The cleaning method for packing 5 shown includes: A. When the packed tower 1 is in the water slurry purification state, its corresponding water slurry pipeline valve 6.3 and purification water pipeline valve 7.3 are in the open state, slurry pipeline valve 9.3 and backflushing water pipeline valve 8.3 are in the closed state, and the power unit 2 is in the stationary state. The water slurry to be treated enters the packed tower 1 through the water slurry pipeline 6.1 and the packing 5 intercepts solid particles to achieve purification treatment of the water slurry material. The treated purified water is discharged from the purified water outlet 7.2 through the purified water pipeline 7.1. The water slurry pipeline valve 6.3, slurry pipeline valve 9.3, backflushing water pipeline valve 8.3, and purification water pipeline valve 7.3 of the empty tower are all in the closed state. B. Along the flow direction of packing 5, when the pressure difference between the upper and lower parts of the previous packed tower 1 is greater than the set value or the slurry treatment time is greater than the set value, the packing cleaning is started. The slurry pipeline valve 6.3 and the purified water pipeline valve 7.3 of the previous packed tower 1 are closed, the slurry pipeline valve 9.3 and the backwash water pipeline valve 8.3 of the empty tower 1 and the previous packed tower 1 are opened, and the inclined pipe valve 11 on the inclined pipe 10 of the packing between the two towers is opened. C. Backwash water is sent from backwash water pipeline 8.1 through backwash water inlet 8.2 into the empty tower and the previous packed tower 1. The power unit 2 corresponding to the previous packed tower 1 drives the rotating shaft 3 and the screw ribbon 4 on it to rotate, generating a vertically upward axial flow, which drives the packing 5 in the tower to move upward. The rotation speed of the rotating shaft 3 is 0.1-5 rpm, preferably 0.5-3 rpm. D. The packing material 5 in the previous packed tower 1 enters the empty tower through the packing inclined pipe 10. Due to gravity, the packing material 5 falls to the bottom of the empty tower. The solid impurities in the packing material 5 are carried out by the backwash water flow through the slurry outlet 9.2 and the slurry pipeline 9.1. E. When the packing cleaning time reaches the set time, the original packed tower 1 becomes an empty tower. Its corresponding backflushing water pipeline valve 8.3 and slurry pipeline valve 9.3 are closed. The original empty tower's corresponding backflushing water pipeline valve 8.3 and slurry pipeline valve 9.3 are closed, and the water slurry pipeline valve 6.3 and purified water pipeline valve 7.3 are opened, and the water slurry purification stage begins. According to a more preferred embodiment of the present invention, step E further includes: after the backwash water pipeline valve 8.3 of the original empty tower is closed in step E, its power device 2 drives the rotating shaft 3 and the screw ribbon 4 on it to rotate, generating a vertically downward axial flow. The rotation speed of the rotating shaft 3 is 0.1-3 revolutions / minute, preferably 0.5-2 revolutions / minute; the rotation time is 1-5 minutes, preferably 1-2 minutes.

[0060] According to a more preferred embodiment of the present invention, in step B, the pressure difference between the upper and lower parts of the preceding packed tower 1 of the empty tower is set to 200-500 kPa.

[0061] According to a more preferred embodiment of the present invention, in step B, the slurry treatment time of the preceding packed tower 1 of the empty tower is set to 4-120 h.

[0062] According to a more preferred embodiment of the present invention, in step C, the flow rate of the backwash water is 0.5-3 mm / s, preferably 1-1.5 mm / s.

[0063] According to a more preferred embodiment of the present invention, in step E, the cleaning time of the packing 5 is set to 15-60 min.

[0064] The present invention will be described in detail below through examples. Unless otherwise specified, the raw materials used in the following examples and comparative examples are all disclosed in the prior art, such as those that can be directly purchased or prepared according to the preparation methods disclosed in the prior art.

[0065] In the following embodiments, the water slurry is sourced from industrial and domestic water. The impurity content in the water slurry is measured by weighing after filtration through filter paper, and the water consumption is measured by a flow meter.

[0066] Example 1 Four identical water slurry treatment towers arranged in a ring, with a diameter of D =1 m, working level of packing material H =2 m, one water slurry treatment tower is set as an empty tower without packing, and the remaining water slurry treatment towers are filled with packing to form packed tower 1 for water slurry purification; the diameter of the projection of the spiral ribbon 4 inside the tower on the horizontal plane is 2 m. d Diameter of packed tower 1 D The ratio is 0.95:1; the pitch of the 4-ribbon thread is... h Working material level of packing 5 H The ratio is 0.2:1.

[0067] The slurry to be treated is fed into the packed tower 1 through the slurry inlet 6.2 via the slurry pipeline 6.1. After being purified by the packing, the slurry is discharged as purified water from the purified water outlet 7.2 through the purified water pipeline 7.1.

[0068] like Figure 1As shown, along the packing flow direction, when the pressure difference between the upper and lower parts of the preceding packed tower 1 is greater than 350 kPa, the inclined pipe valve 11 between the empty tower and the preceding packed tower 1 is opened. The angle between the inclined pipe and the vertical direction is 60°. Backwash water is sent into the empty tower 1 from the backwash water inlet 8.2 at the bottom of the tower body along the backwash water pipeline 8.1. The backwash water flow rate is 1.5 mm / s. At the same time, the power unit 2 of the preceding packed tower 1 is started, and the speed of the screw ribbon 4 is 3 rpm, generating a vertically upward axial flow. The packing is slowly lifted at a speed of v=1.2 m / min. Solid impurities in the packing are discharged from the slurry outlet 9.2 at the top of the tower body through the slurry pipeline 9.1 by the backwash water flow. The packing enters the empty tower through the inclined pipe 10. Backwash water is sent into the empty tower from the bottom inlet and outlet. The backwash water flow rate is 1.5 mm / s. The slurry that enters the empty tower along with the packing material is discharged from the upper inlet and outlet of the tower body at a speed of mm / s. The packing material falls freely to the bottom of the empty tower due to gravity and accumulates continuously. After the packing cleaning time reaches 30 minutes, the power unit 2 of the current empty tower is shut down, all inlets and outlets of the original empty tower and the current empty tower are closed, the packing inclined pipe 10 connected to the current empty tower is closed, the power unit 2 of the original empty tower is started, the speed of the screw ribbon 4 is 2 revolutions / minute, a vertically downward axial flow is generated to compact the packing material and remove the voids in the packing material. After 1 minute, the power unit 2 of the original empty tower is shut down, and the original empty tower can be used for water slurry treatment.

[0069] The impurity content of the slurry was 600 mg / L, and the impurity content after purification was 6 mg / L. The single operation cycle was 36 hours. The slurry purification rate during the treatment stage was 23 m / s. 3 The water slurry purification rate during the packing cleaning stage is 15.3 m / h. 3 The washing time is 31 minutes, and the average backwash water consumption per unit of solid particles processed is 25.98 m³ / h. 3 / t.

[0070] Example 2 Five identical water slurry treatment towers arranged in a ring, with a diameter of D =1 m, working level of packing material H =2 m, one water slurry treatment tower is set as an empty tower without packing, and the remaining water slurry treatment towers are filled with packing to form packed tower 1 for water slurry purification; the diameter of the projection of the spiral ribbon 4 inside the tower on the horizontal plane is 2 m. d Diameter of packed tower 1 D The ratio is 0.9:1; the pitch of the 4-ribbon thread is... h Working material level of packing 5 H The ratio is 0.125:1.

[0071] The slurry to be treated is fed into the packed tower 1 through the slurry inlet 6.2 via the slurry pipeline 6.1. After being purified by the packing, the slurry is discharged as purified water from the purified water outlet 7.2 through the purified water pipeline 7.1.

[0072] like Figure 1 As shown, along the packing flow direction, when the pressure difference between the upper and lower parts of the preceding packed tower 1 is greater than 350 kPa, the inclined pipe valve 11 between the empty tower and the preceding packed tower 1 is opened. The angle between the inclined pipe and the vertical direction is 75°. Backwash water is sent into the empty tower 1 from the bottom backwash water inlet 8.2 of the tower body along the backwash water pipeline 8.1. The backwash water flow rate is 1 mm / s. At the same time, the power unit 2 of the preceding packed tower 1 is started, and the speed of the screw ribbon 4 is 0.5 rpm, generating a vertically upward axial flow. The packing is slowly lifted at a speed of v=0.125 m / min. Solid impurities in the packing are discharged from the slurry outlet 9.2 at the top of the tower body through the slurry pipeline 9.1 by the backwash water flow. The packing enters the empty tower through the inclined pipe 10. Backwash water is sent into the empty tower from the bottom inlet and outlet. The backwash water flow rate is 1 mm / s. The slurry that enters the empty tower along with the packing material is discharged from the upper inlet and outlet of the tower body at a speed of mm / s. The packing material falls freely to the bottom of the empty tower due to gravity and accumulates continuously. After the packing cleaning time reaches 60 minutes, the power unit 2 of the current empty tower is shut down, all inlets and outlets of the original empty tower and the current empty tower are closed, the packing inclined pipe 10 connected to the current empty tower is closed, the power unit 2 of the original empty tower is started, the speed of the screw ribbon 4 is 0.5 rpm, which generates a vertically downward axial flow to compact the packing material and eliminate voids in the packing material. After 2 minutes, the power unit 2 of the original empty tower is shut down, and the original empty tower can be used for water slurry treatment.

[0073] The impurity content of the slurry was 600 mg / L, and the impurity content after purification was 15 mg / L. The single operation cycle was 33 hours; the slurry purification rate during the treatment stage was 28.3 m³ / s. 3 The water slurry purification rate during the packing cleaning stage is 21.2 m / h. 3 The washing time is 62 minutes, and the average backwash water consumption per unit of solid particles processed is 41.44 m³ / h. 3 / t.

[0074] Example 3 Three identical water slurry treatment towers arranged in a ring, with a diameter of D =1m, working level of packing material H =2 m, one water slurry treatment tower is set as an empty tower without packing, and the remaining water slurry treatment towers are filled with packing to form packed tower 1 for water slurry purification; the diameter of the projection of the spiral ribbon 4 inside the tower on the horizontal plane is 2 m. d Diameter of packed tower 1 D The ratio is 0.95:1; the pitch of the 4-ribbon thread is... h Working material level of packing 5H The ratio is 0.25:1. The slurry to be treated is sent into the packed tower 1 through the slurry inlet 6.2 via the slurry pipeline 6.1. After the slurry is purified by the packing, the purified water is discharged from the purified water outlet 7.2 through the purified water pipeline 7.1.

[0075] like Figure 1 As shown, along the packing flow direction, when the pressure difference between the upper and lower parts of the preceding packed tower 1 is greater than 350 kPa, the inclined pipe valve 11 between the empty tower and the preceding packed tower 1 is opened. The angle between the inclined pipe and the vertical direction is 45°. Backwash water is sent into the empty tower 1 from the bottom backwash water inlet 8.2 of the tower body along the backwash water pipeline 8.1. The backwash water flow rate is 1.5 mm / s. At the same time, the power unit 2 of the preceding packed tower 1 is started, and the speed of the screw ribbon 4 is 1.5 rpm, generating a vertically upward axial flow. The packing is slowly lifted at a speed of v=0.75 m / min. Solid impurities in the packing are discharged from the slurry outlet 9.2 at the top of the tower body through the slurry pipeline 9.1 by the backwash water flow. The packing enters the empty tower through the inclined pipe 10. Backwash water is sent into the empty tower from the bottom inlet and outlet. The backwash water flow rate is 1.5 mm / s. The slurry that enters the empty tower along with the packing is discharged from the upper inlet and outlet of the tower body at a speed of mm / s. The packing falls freely to the bottom of the empty tower due to gravity and accumulates continuously. After the packing cleaning time reaches 40 min, the power unit 2 of the current empty tower is shut down, all inlets and outlets of the original empty tower and the current empty tower are closed, the packing inclined pipe 10 connected to the current empty tower is closed, the power unit 2 of the original empty tower is started, the speed of the screw ribbon 4 is 1.5 rpm, which generates a vertically downward axial flow to compact the packing and remove the voids in the packing. After 1 min, the power unit 2 of the original empty tower is shut down, and the original empty tower can be used for water slurry treatment.

[0076] The impurity content of the slurry was 600 mg / L, and the impurity content after purification was 9 mg / L. The single operation cycle was 34 hours; the slurry purification rate during the treatment stage was 14.7 m / s. 3 / h, the water slurry purification rate during the packing cleaning stage is 7.35 m / h. 3 The washing time is 41 minutes, and the average backwash water consumption per unit of solid particles processed is 38.3 m³ / h. 3 / t.

[0077] Example 4 Compared to Example 1, the difference is that the angle between the inclined tube and the vertical direction is 80°.

[0078] The impurity content of the slurry was 600 mg / L, and the impurity content after purification was 25 mg / L. The single operation cycle was 22 hours; the slurry purification rate during the treatment stage was 17.81 m / s. 3 The water slurry purification rate during the packing cleaning stage is 11.88 m / h. 3The washing time is 51 min, and the average backwash water consumption per unit of solid particles processed is 94.1 m³ / h. 3 / t.

[0079] Example 5 Compared to Example 1, the difference lies in the diameter of the projection of the screw ribbon 4 onto the horizontal plane. d Diameter of packed tower 1 D The ratio is 0.8:1; the pitch of the 4-ribbon thread is... h Working material level of packing 5 H The ratio is 0.3:1; the packing is slowly raised at a speed of v=1.8 m / min.

[0080] The impurity content of the slurry was 600 mg / L, and the impurity content after purification was 26 mg / L. The single operation cycle was 20 hours; the slurry purification rate during the treatment stage was 19.51 m / s. 3 The water slurry purification rate during the packing cleaning stage is 13.1 m / h. 3 The washing time was 71 min, and the average backwash water consumption per unit of solid particles treated was 132.56 m³ / h. 3 / t.

[0081] Example 6 Compared to Example 1, the difference is that there is only one inlet and one outlet at both the top and bottom of the tower.

[0082] The impurity content of the slurry was 600 mg / L, and the impurity content after purification was 10 mg / L. The single operation cycle was 30 hours; the slurry purification rate during the treatment stage was 21.21 m / s. 3 The water slurry purification rate during the packing cleaning stage is 14.14 m / h. 3 The washing time is 35 minutes, and the average backwash water consumption per unit of solid particles processed is 38.42 m³ / h. 3 / t.

[0083] Example 7 Compared with Example 1, the backwash water flow rate is 0.8 mm / s, the rotation speed of the screw ribbon 4 is 0.1 rpm, and the packing is slowly raised at a speed of v=0.04 m / min.

[0084] The impurity content of the slurry was 600 mg / L, and the impurity content after purification was 30 mg / L. The single operation cycle was 20 hours. The slurry purification rate during the treatment stage was 19.51 m / s. 3 The water slurry purification rate during the packing cleaning stage is 13.01 m / h. 3 The washing time is 81 minutes, and the average backwash water consumption per unit of solid particles processed is 81.36 m³ / h. 3 / t.

[0085] Comparative Example 1 A single water slurry purification device is used for cleaning. The packing tower does not contain power units, rotating shafts, screws, or other components. The backwash water flow rate is 2.3 mm / s.

[0086] The impurity content of the slurry was 600 mg / L, and the impurity content after purification was 52 mg / L. The single operation cycle was 14 hours; the slurry purification rate during the treatment stage was 4.81 m / s. 3 The water consumption is 293.91 m³ / h, meaning it cannot be used for slurry purification during the packing cleaning stage. The cleaning time is 100 min, and the average water consumption is 293.91 m³ / h. 3 / t.

[0087] The results above show that the embodiments 1-3 of the present invention have the characteristics of better filtration effect, lower water consumption, and higher cleaning efficiency.

[0088] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A system for treating water slurry, characterized in that, The system includes: n identical water slurry treatment towers arranged in a ring, n≥2, wherein at least one water slurry treatment tower is set as an empty tower without packing (5), and the remaining water slurry treatment towers are filled with packing (5) to form a packed tower (1) for water slurry purification; The two adjacent water slurry treatment towers are connected by a packing inclined tube (10), and each of the water slurry treatment towers has at least one inlet and outlet at the top and bottom of the tower body; Each water slurry treatment tower has an axially spirally extending spiral ribbon (4) installed on its central axis.

2. The system according to claim 1, wherein, Along the flow direction of the packing (5), in two adjacent water slurry treatment towers, the packing inclined tube (10) extends obliquely downward from the side of the previous water slurry treatment tower and connects to the side of the next water slurry treatment tower. The packing inclined tube (10) of the last water slurry treatment tower extends obliquely downward from the side and connects to the first water slurry treatment tower. Preferably, The angle between the packing inclined tube (10) and the vertical direction is in the range of 20°-80°, preferably 45°-75°; and / or The packing inclined tube (10) is equipped with a control valve for controlling the connection and closure of the packing inclined tube (10).

3. The system according to claim 1 or 2, wherein, The horizontal line at the upper end of the spiral ribbon (4) is not higher than the upper end connection port of the packing inclined tube (10); the horizontal line at the lower end of the spiral ribbon (4) is not lower than the lower end of the packing (5) inside the packing tower (1). Preferably, The diameter of the spiral ribbon (4) projected onto the horizontal plane d Diameter of packed tower (1) D The ratio is 0.8~0.98:1, which is preferred. d / D = 0.9~0.95:1; and / or Working material level of packing (5) H The pitch of the spiral ribbon (4) is preferably 1-3 m. h Working material level of filler (5) H The ratio is 0.1 to 0.3:1, more preferably. h / H = 0.125~0.25:

1.

4. The system according to any one of claims 1-3, wherein, The inlet and outlet of the water slurry treatment tower are connected by inlet and outlet pipelines; Preferably, control valves are provided at the connection points between each inlet / outlet pipeline and the inlet / outlet of each slurry treatment tower to control the connection and closure of each inlet / outlet with the pipeline; and / or The horizontal line of the upper inlet and outlet of the water slurry treatment tower is not lower than the upper end connection port of the packing inclined tube (10); and / or, the bottom inlet and outlet of the water slurry treatment tower is not higher than the lower end of the packing (5) inside the water slurry treatment tower. Preferably, each of the water slurry treatment towers has two inlets and two outlets at the top and bottom of the tower body.

5. The system according to any one of claims 1-4, wherein, The inlet and outlet at the top of each of the aforementioned water slurry treatment towers include: The slurry inlet (6.2) is used to feed the slurry to be treated; and / or Slurry outlet (9.2) for discharging slurry generated from cleaning packing (5). and / or The inlet and outlet at the bottom of each of the aforementioned water slurry treatment towers include: Purified water outlet (7.2) for discharging purified water after slurry purification; and / or Backwash water inlet (8.2) for backwash water used to clean the feed packing (5).

6. The system according to claim 5, wherein, The system also includes: The slurry pipeline (6.1) is divided into multiple branches that connect to the slurry inlet (6.2) at the top of each slurry treatment tower. Preferably, each branch of the slurry pipeline (6.1) is equipped with a slurry pipeline valve (6.3). and / or The purified water pipeline (7.1) is divided into multiple branches that connect to the purified water outlet (7.2) at the bottom of each packed tower (1). Preferably, each branch of the purified water pipeline (7.1) is equipped with a purified water pipeline valve (7.3). and / or The slurry pipeline (9.1) is divided into multiple branches that connect to the slurry outlet (9.2) at the top of each packed tower (1). Preferably, each branch of the slurry pipeline (9.1) is equipped with a slurry pipeline valve (9.3). and / or The backwash water pipeline (8.1) is divided into multiple branches connected to the backwash water inlet (8.2) at the bottom of each packed tower (1). Preferably, a backwash water pipeline valve (8.3) is arranged on each branch of the backwash water pipeline (8.1).

7. A method for treating water slurry, characterized in that, Using the system according to any one of claims 1-6, the method comprises: 1) Slurry treatment stage: A. The water slurry to be treated is fed into the packed tower (1) through the inlet and outlet at the top of the tower body, and the purified water after being treated by the packing (5) is discharged through the inlet and outlet at the bottom of the tower body; B. Along the flow direction of the packing (5), when the pressure difference between the upper and lower parts of the previous packed tower (1) of the empty tower is greater than the set value or the water slurry treatment time is greater than the set value, step 2) is used to clean the packing (5); C. Repeat steps A through B; 2) Packing material (5) cleaning stage: I. Backwash water is introduced from the bottom inlet and outlet of the previous packed tower (1) of the empty tower; II. The screw ribbon (4) in the previous packed tower (1) of the empty tower rotates, causing the packing (5) in the tower to flow upward. The packing (5) enters the empty tower through the packing inclined tube (10). The solid impurities in the packing (5) are discharged from the upper inlet and outlet of the tower body by the action of the backwash water flow. III. Backwash water is introduced from the bottom inlet and outlet of the empty tower, and the slurry that enters the empty tower along with the packing (5) is discharged from the top inlet and outlet of the empty tower. IV. When the cleaning time of the packing (5) reaches the set value, the previous packing tower (1) of the empty tower becomes an empty tower, and the original empty tower becomes a packing tower (1) used for water slurry purification; the screw (4) stops rotating and the feed backwash water is stopped; Preferably, after the backwash water stops in step IV, the screw ribbon (4) is rotated in the opposite direction to generate a vertically downward axial flow to compact the packing (5). When the compaction time of the packing (5) reaches the set value, the screw ribbon (4) stops rotating.

8. The method according to claim 7, wherein, The slurry to be treated is fed into the slurry inlet (6.2) at the top of the tower; and / or The purified water after water slurry purification is discharged from the purified water outlet (7.2) at the bottom of the tower; and / or The backwash water for cleaning the packing (5) is introduced from the backwash water inlet (8.2) at the bottom of the tower body; and / or The slurry generated from cleaning the packing (5) is discharged from the slurry outlet (9.2) at the top of the tower.

9. The method according to claim 7 or 8, wherein, The differential pressure setting of the preceding packed tower (1) is 200-500 kPa; and / or The slurry treatment time setting for the preceding packed tower (1) in the empty tower is 4-120 h; and / or The backwash water has a flow rate of 0.5-3 mm / s, preferably 1-1.5 mm / s; and / or The rotational speed of the ribbon (4) in the preceding packed tower (1) of the empty tower is 0.1-5 rpm, preferably 0.5-3 rpm; and / or The cleaning time for the packing material (5) described in step IV is set to 15-60 min.

10. The method according to any one of claims 7-9, wherein, The spiral ribbon (4) of the empty tower rotates in the opposite direction at a speed of 0.1-3 revolutions per minute; Preferably, the rotational speed is 0.5-2 revolutions per minute; and / or The time setting for compacting the packing (5) is 1-5 min, preferably 1-2 min.

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