An on-line backflushing ceramic filter canister system

Abstract

The utility model relates to a kind of online backwash ceramic filter tank systems.Electromagnetic reversing valve and electromagnetic stop valve are set up one-to-one with each suction tube, two openings of each electromagnetic reversing valve are connected with suction tube, another opening is connected with the import of suction pump, with the first valve position of liquid in suction pump flowing to suction tube, and the second valve position of reverse flow;Electromagnetic stop valve includes the import of acid outlet connected with pickling pump and the outlet of acid outlet connected with corresponding suction tube, with opening valve position and closing valve position;Controller is controlled connection with suction pump, pickling pump, each electromagnetic reversing valve and each electromagnetic stop valve respectively, to control at least one carbon ceramic filter plate in backwash state, corresponding electromagnetic reversing valve switches to first valve position, corresponding electromagnetic stop valve is opening valve position;Control at least one ceramic filter plate in filtration state, corresponding electromagnetic reversing valve switches to second valve position, corresponding electromagnetic stop valve is closing valve position.On-line high-efficiency backwash can be achieved.

Description

Technical Field

[0001] This utility model relates to an online backwashing ceramic filter tank system. Background Technology

[0002] In alumina production, ceramic filter plate assemblies are typically placed in filter tanks. A suction pipe connected to a pump is routed to the outlet of the ceramic filter plate assembly. Multiple ceramic filter plates are usually installed in a filter tank to maximize filtration efficiency. These ceramic filter plate assemblies are prone to clogging due to free iron compounds, fine particle deposits, and chemical scaling (such as calcium carbonate and calcium sulfate) in the slurry. If not cleaned promptly, the increasing suction pressure can cause the ceramic filter plates to break. Current cleaning methods mostly rely on manual cleaning, requiring machine shutdown. This process is cumbersome, time-consuming, and inefficient, and the shutdown also impacts filtration efficiency. Utility Model Content

[0003] The purpose of this invention is to provide an online backwashing ceramic filter tank system that can backwash online without shutting down the system. It not only uses water pressure for physical cleaning, but also uses acid washing to chemically clean and remove adhering calcium carbonate and calcium sulfate, thereby achieving thorough clogging and cleaning of the ceramic filter plates.

[0004] The technical solution of this utility model is as follows: An online backwashing ceramic filter tank system includes:

[0005] Filter canister;

[0006] A ceramic filter plate assembly, consisting of multiple ceramic filter plates, is installed at the bottom of the filter tank.

[0007] The suction pump is connected to the outlet of each ceramic filter plate through a suction pipe;

[0008] An electromagnetic reversing valve is provided in correspondence with each of the aforementioned suction tubes. Each electromagnetic reversing valve includes three openings, two of which are connected to the suction tube and the other opening is connected to the inlet of the suction pump. It has a first valve position that allows the liquid in the suction pump to flow to the suction tube, and a second valve position that allows the liquid in the suction tube to flow to the suction pump.

[0009] Pickling pump, used to pump pickling solution;

[0010] An electromagnetic shut-off valve is provided in correspondence with each of the suction pipes, including an acid inlet connected to the outlet of the pickling pump and an acid outlet connected to the corresponding suction pipe, and has an open valve position and a closed valve position.

[0011] The controller is connected to the suction pump, the acid washing pump, each solenoid directional valve, and each solenoid shut-off valve to control at least one carbon ceramic filter plate to be in the backwashing state, with the corresponding solenoid directional valve switching to the first valve position and the corresponding solenoid shut-off valve in the open position; and to control at least one ceramic filter plate to be in the filtration state, with the corresponding solenoid directional valve switching to the second valve position and the corresponding solenoid shut-off valve in the closed position.

[0012] Based on the above scheme, the following improvements are made: under the control of the controller, the filtrate from the suction pump and the pickling solution from the pickling pump alternately enter the corresponding ceramic filter plate.

[0013] Based on the above scheme, the following improvement is made: a stirring device is provided at the bottom of the filter tank.

[0014] Based on the above scheme, the following improvements are made: an annular mounting plate is provided at a set distance from the bottom of the filter tank, and each ceramic filter plate is mounted on the annular mounting plate. The stirring device includes a stirring motor and a stirring paddle. The stirring paddle includes an upper blade and a lower blade. The upper blade extends to the middle opening of the annular mounting plate, and the lower blade is located below the annular mounting plate.

[0015] Based on the above scheme, further improvements are made as follows: the upper blade is composed of multiple L-shaped rods evenly distributed in the circumference, and the lower blade is composed of multiple spiral blades evenly distributed in the circumference.

[0016] Based on the above scheme, the following improvements are made: the ring-shaped mounting plate is provided with mesh holes.

[0017] Based on the above scheme, the following improvements are made: the electromagnetic directional valve is a two-position three-way electromagnetic valve.

[0018] The beneficial effects of this technical solution are as follows: In an online backwashing ceramic filter tank system, under the control of the controller, each ceramic filter plate undergoes backwashing in turn, while the remaining ceramic filter plates continue filtering normally. This achieves continuous online backwashing and filtration without shutdown, operating synchronously. The backwashing principle is as follows: Since all ceramic filter plates share the same suction pump, there is always filtrate in the pump. The controller switches the solenoid valve at the corresponding point of the backwashing ceramic filter plate to the first valve position, allowing a portion of the filtrate flowing from the suction pump to enter the corresponding suction pipe and then from the outlet of the ceramic filter plate into the corresponding ceramic filter plate. The pressure of the filtrate is used to backwash the micropores, micropore inlets, and outer surfaces. This step removes debris with weak adhesion to the ceramic filter plate. After a set time, the controller switches the corresponding solenoid shut-off valve to the open position and the corresponding solenoid directional valve to the second position, allowing the pickling solution pumped by the pickling pump to enter the corresponding suction pipe and then into the corresponding ceramic filter plate. The pickling solution enters the interior and micropores of the ceramic filter plate sequentially, reacting chemically with the calcium carbonate and calcium sulfate adhering to the ceramic filter plate, thereby removing the calcium carbonate and calcium sulfate. Subsequently, the corresponding solenoid shut-off valve is switched to the closed position, and the corresponding solenoid directional valve is switched to the first position. The filtrate in the suction pump is used to rinse the ceramic filter plate of residual pickling solution to prevent corrosion of the ceramic filter plate by the pickling solution. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the system structure principle of a specific embodiment of an online backwashing ceramic filter tank system of this utility model;

[0020] Figure 2 This is a schematic diagram of the longitudinal section of the bottom of the filter tank;

[0021] In the diagram: 1-Filter tank, 11-Annular mounting plate, 2-Ceramic filter plate, 3-Suction pump, 4-Suction pipe, 5-Solenoid directional valve, 6-Pickling pump, 7-Pickling solution storage tank, 8-Solenoid shut-off valve, 9-Controller, 10-Agitator, 101-Agitator motor, 102-Agitator shaft, 103-Upper blade, 104-Lower blade. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0026] A specific embodiment of the online backwashing ceramic filter tank system of this utility model is as follows: Figure 1-2 As shown, the online backwashing ceramic filter tank system includes a filter tank 1, ceramic filter plate assembly, suction pump 3 and suction pipe 4, electromagnetic reversing valve 5, acid pickling pump 6 and acid pickling solution storage tank 7, electromagnetic shut-off valve 8 and controller 9, etc. Its main function is to ensure the normal operation of the ceramic filter plates 2 while also performing online cleaning of each ceramic filter plate 2 in turn, removing debris and blockages, as well as calcium salts, sulfates, and other adhering substances from the surface and internal micropores of the ceramic filter plates 2.

[0027] The filter tank 1 has a prior art structure, being cylindrical in shape. It has a slurry inlet and a water inlet at the top, and a slag outlet at the bottom, connected to a slurry pump for slag discharge. An annular mounting plate 11 is fixed at a certain distance from the bottom inside the tank. The annular mounting plate 11 has evenly distributed mesh holes, and ceramic filter plates 2 are evenly distributed on it. The outlets of the ceramic filter plates 2 are led out of the filter tank 1 through suction pipes 4 and connected to an external suction pump 3. Specifically, the suction pump 3 is connected to the outlet of each ceramic filter plate 2 through suction pipes 4. The suction pump 3 draws out the filtrate from the ceramic filter plates 2 and pumps it out. Each suction pipe 4 is equipped with a quick-connect glass sight glass to observe the turbidity of the filtrate inside the pipe. Turbidity indicates a malfunction of the corresponding ceramic filter plate 2. The suction pump 3 includes a motor to drive its operation.

[0028] The ceramic filter plate assembly includes four ceramic filter plates 2, which are mounted on an annular mounting plate 11 at the bottom of the filter tank 1. The plate is rectangular in shape and has an outlet connected to the suction tube 4, as well as filter micropores for filtration.

[0029] There are four electromagnetic directional valves 5, each corresponding to one of the four suction tubes 4. Each electromagnetic directional valve 5 includes three openings: two openings are connected to the suction tube 4, and the other opening is connected to the inlet of the suction pump 3. It has a first valve position that allows liquid in the suction pump 3 to flow to the suction tube 4, and a second valve position that allows liquid in the suction tube 4 to flow to the suction pump 3. The electromagnetic directional valve 5 is a two-position three-way electromagnetic valve.

[0030] Pickling pump 6 is used to pump pickling solution, including a motor that drives its operation and a pickling solution storage tank 7 connected to its inlet for drawing pickling solution from it. The commonly used reagent for pickling solution is a 1%-3% dilute nitric acid solution, which restores porosity by dissolving blockages such as calcium salts and iron oxides.

[0031] There are four electromagnetic shut-off valves 8, which are respectively set one-to-one with the four suction pipes 4. They include an acid inlet connected to the outlet of the pickling pump 6 and an acid outlet connected to the corresponding suction pipe 4. The electromagnetic shut-off valve 8 has an open valve position and a closed valve position.

[0032] The controller 9 is connected to the suction pump 3, the pickling pump 6, each solenoid directional valve 5, and each solenoid shut-off valve 8 to control at least one carbon ceramic filter plate 2 in the backwashing state, with the corresponding solenoid directional valve 5 switching to the first valve position and the corresponding solenoid shut-off valve 8 in the open position; and to control at least one ceramic filter plate 2 in the filtration state, with the corresponding solenoid directional valve 5 switching to the second valve position and the corresponding solenoid shut-off valve 8 in the closed position. Under the control of the controller 9, the filtrate from the suction pump 3 and the pickling solution from the pickling pump 6 alternately enter the corresponding ceramic filter plate 2. The annular mounting plate 11 is provided with mesh holes.

[0033] like Figure 2 As shown, a stirring device 10 is provided at the bottom of the filter tank 1. An annular mounting plate 11 is located at a predetermined distance from the bottom surface of the filter tank 1. Each ceramic filter plate 2 is mounted on the annular mounting plate 11. The stirring device 10 includes a stirring motor 101, a stirring shaft 102, and a stirring paddle. The stirring paddle includes an upper blade 103 and a lower blade 104. The upper blade 103 extends to the central opening of the annular mounting plate 11, and the lower blade 104 is located below the annular mounting plate 11. The upper blade 103 is composed of multiple circumferentially distributed L-shaped rods, and the lower blade 104 is composed of multiple circumferentially distributed spiral blades.

[0034] In an online backwashing ceramic filter tank system, under the control of a controller 9, each ceramic filter plate 2 takes turns backwashing, while the remaining ceramic filter plates 2 continue filtering normally, achieving continuous online backwashing and filtration without shutdown. The backwashing principle is as follows: Since each ceramic filter plate 2 shares the same suction pump 3, there is always filtrate in the suction pump 3. The controller 9 controls the electromagnetic reversing valve 5 at the corresponding point of the backwashed ceramic filter plate 2 to switch to the first valve position, so that a portion of the filtrate flowing out of the suction pump 3 enters the corresponding suction pipe 4 and enters the corresponding ceramic filter plate 2 from the outlet. The pressure of the filtrate is used to backwash impurities located in the micropores, at the micropore inlet, and on the outer surface. One step can wash away impurities with weak adhesion to the ceramic filter plate 2. Then, after a set time, the controller 9 controls the corresponding solenoid shut-off valve 8 to switch to the open position and the corresponding solenoid directional valve 5 to the second position, so that the pickling solution pumped by the pickling pump 6 enters the corresponding suction pipe 4 and then enters the corresponding ceramic filter plate 2. The pickling solution enters the interior and micropores of the ceramic filter plate 2 in sequence, and reacts chemically with the calcium carbonate and calcium sulfate adhering to the ceramic filter plate 2, thereby removing the calcium carbonate and calcium sulfate. Then, the corresponding solenoid shut-off valve 8 is changed to the closed position, and the corresponding solenoid directional valve 5 is switched to the first position. The filtrate in the suction pump 3 is used to rinse the residual pickling solution in the ceramic filter plate 2 to prevent the ceramic filter plate 2 from being corroded by the pickling solution.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. An online backwashing ceramic filter tank system, comprising: Filter canister; A ceramic filter plate assembly, consisting of multiple ceramic filter plates, is installed at the bottom of the filter tank. The suction pump is connected to the outlet of each ceramic filter plate through a suction pipe; Its characteristic is that it further includes: An electromagnetic reversing valve is provided in correspondence with each of the aforementioned suction tubes. Each electromagnetic reversing valve includes three openings, two of which are connected to the suction tube and the other opening is connected to the inlet of the suction pump. It has a first valve position that allows the liquid in the suction pump to flow to the suction tube, and a second valve position that allows the liquid in the suction tube to flow to the suction pump. Pickling pump, used to pump pickling solution; An electromagnetic shut-off valve is provided in correspondence with each of the suction pipes, including an acid inlet connected to the outlet of the pickling pump and an acid outlet connected to the corresponding suction pipe, and has an open valve position and a closed valve position. The controller is connected to the suction pump, the acid washing pump, each solenoid directional valve, and each solenoid shut-off valve to control at least one carbon ceramic filter plate to be in the backwashing state, with the corresponding solenoid directional valve switching to the first valve position and the corresponding solenoid shut-off valve in the open position; and to control at least one ceramic filter plate to be in the filtration state, with the corresponding solenoid directional valve switching to the second valve position and the corresponding solenoid shut-off valve in the closed position.

2. The online backwashing ceramic filter tank system according to claim 1, characterized in that, Under the control of the controller, the filtrate from the suction pump and the pickling solution from the pickling pump alternately enter the corresponding ceramic filter plates.

3. The online backwashing ceramic filter tank system according to claim 1, characterized in that, The bottom of the filter tank is equipped with a stirring device.

4. The online backwashing ceramic filter tank system according to claim 3, characterized in that, An annular mounting plate is provided at a set distance from the bottom of the filter tank. Each ceramic filter plate is mounted on the annular mounting plate. The stirring device includes a stirring motor and a stirring paddle. The stirring paddle includes an upper blade and a lower blade. The upper blade extends to the middle opening of the annular mounting plate, and the lower blade is located below the annular mounting plate.

5. The online backwashing ceramic filter tank system according to claim 4, characterized in that, The upper blade consists of multiple L-shaped rods evenly distributed around the circumference, while the lower blade consists of multiple spiral blades evenly distributed around the circumference.

6. The online backwashing ceramic filter tank system according to claim 4, characterized in that, The ring-shaped mounting plate has mesh holes.

7. The online backwashing ceramic filter tank system according to claim 1, characterized in that, The solenoid directional valve is a two-position three-way solenoid valve.

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