Solid-liquid separation type diatomite filtering system

Abstract

The invention discloses a solid-liquid separation type diatomite filtering system, and relates to the technical field of filtering, the solid-liquid separation type diatomite filtering system comprises a soil coating tank for storing a liquid mixed with diatomite, a soil coating circulating pipeline, and a stock solution tank, a delivery pump, a filter cartridge and a purified liquid tank which are communicated in sequence, a filter element is vertically arranged in a barrel, and the bottom of the barrel is provided with a drain outlet and a liquid inlet pipeline; a liquid outlet pipeline and a cleaning pipeline which are both communicated with the filter element are arranged at the top of the barrel, a blow-down valve is arranged at the blow-down port, the top of an inner cavity of the barrel is communicated with a first air supply pipeline, and the bottom of the inner cavity of the barrel is communicated with a pressure return pipeline; the bottom of the soil coating tank is communicated with the liquid inlet channel of the barrel through a circulating pump, one end of the soil coating circulating pipeline is located in the soil coating tank, and the other end of the soil coating circulating pipeline is communicated with the filter element; the filter element is coated with soil through the soil coating tank; the raw liquid in the barrel is pressed into the pressure-back pipeline through the gas supplied by the first gas supply pipeline, so that the raw liquid resource is saved, and the regeneration effect of the filter element is improved.

Description

Technical Field

[0001] The present invention relates to the field of filtration technology, in particular to a solid-liquid separation type diatomaceous earth filtration system. Background Art

[0002] With the rapid development and application of advanced technology, the requirements for fluids in both life and industrial production are getting higher and higher. When faced with high viscosity, flocculent debris, or debris that easily clogs the filter element and cannot complete continuous filtration of the fluid, a diatomaceous earth filter is needed. Diatomaceous earth is used to form a filter cake outside the filter membrane of the filter element, thereby assisting in completing the filtration of the fluid. However, the filter element will gradually be clogged by impurities during use and cannot continue to work. If the filter element that does not work is discarded and replaced with a new one, it will cause a large investment in consumables.

[0003] In order to solve the problem of filter element clogging in the prior art, backwash regeneration is often adopted. Specifically, gas or liquid is used as the cleaning fluid, and the cleaning fluid enters the liquid outlet of the filter element. The cleaning fluid flows in the opposite direction to the filtered liquid, thereby flushing out the impurities clogging the filter element and discharging them from the solid discharge port at the bottom of the filter. However, during the solid discharge process, the cleaning fluid is discharged together with the original liquid and impurities in the filter, resulting in waste of the original liquid.

[0004] Therefore, people are in urgent need of a solid-liquid separation diatomaceous earth filtration system with good regeneration effect and saving raw liquid resources. Summary of the Invention

[0005] The purpose of the present invention is to provide a solid-liquid separation diatomaceous earth filtration system to solve the problems existing in the above-mentioned prior art. Before solid discharge, the air supply of the first air supply pipeline is used to pressurize the original liquid in the cylinder, thereby reducing the waste of original liquid during the solid discharge process and improving the regeneration effect. At the same time, the filter element is pre-coated to form a filter cake before filtration, thereby improving the filtration effect.

[0006] To achieve the above-mentioned object, the present invention provides the following solution: The present invention provides a solid-liquid separation type diatomaceous earth filtration system, comprising a raw liquid tank, a delivery pump, at least one filter cartridge and a purified liquid tank connected in sequence, the filter cartridge comprising a cylinder body and a filter element, the filter element being vertically arranged in the cylinder body, a solid discharge port and a liquid inlet pipeline being provided at the bottom of the cylinder body, a liquid outlet pipeline connected to the filter element and a cleaning pipeline connected to the filter element being provided at the top, a solid discharge valve being provided at the solid discharge port, the top of the inner cavity of the cylinder body being connected to a first air supply pipeline, the bottom of the inner cavity of the cylinder body being connected to a pressure return pipeline, the liquid inlet pipeline of the cylinder body, the liquid outlet pipeline of the cylinder body, the cleaning pipeline, the first air supply pipeline and the pressure return pipeline being all provided with valves;

[0007] When multiple filter cartridges are provided, the multiple filter cartridges are provided in parallel;

[0008] It further includes a coating tank for storing the liquid mixed with diatomaceous earth and a coating circulation pipeline. The bottom of the coating tank is connected to the liquid inlet channel of the cylinder body through a circulation pump and a valve. One end of the coating circulation pipeline is located inside the coating tank, and the other end is connected to the filter element. A valve is provided on the coating circulation pipeline.

[0009] Preferably, the diatomaceous earth filtration system further includes a dosing tank for storing filter aid, and the dosing tank is connected to the liquid inlet pipeline of the cylinder body through a metering pump.

[0010] Preferably, the solid-liquid separation type diatomaceous earth filtration system further includes a cross-flow tank and a cross-flow pipeline. The bottom of the cross-flow tank is connected to the front pipeline of the delivery pump through a valve. One end of the cross-flow pipeline is located at the bottom of the inner cavity of the cross-flow tank, and the other end is connected to the top of the inner cavity of the cylinder body. A valve is provided at the front end of the connection position between the cross-flow tank and the front pipeline of the delivery pump, and a valve is provided on the cross-flow pipeline.

[0011] Preferably, a second air supply pipeline is connected to the bottom of the inner cavity of the cylinder body, and a third air supply pipeline connected to the filter element is provided at the top of the cylinder body. Valves are provided on both the second air supply pipeline and the third air supply pipeline.

[0012] Preferably, the first air supply pipeline and the second air supply pipeline share a common air supply pipeline 1. Pressure regulating valves for controlling pressure are provided on both the air supply pipeline 1 and the third air supply pipeline. Both the air supply pipeline 1 and the third air supply pipeline are connected to a compressed gas supply device.

[0013] Preferably, a residual liquid discharge pipeline is provided at the top of the cylinder body. The liquid inlet of the residual liquid discharge pipeline is located at the bottom of the inner cavity of the filter element, and the liquid outlet is located outside the cylinder body.

[0014] Preferably, the purified liquid tank is connected to the cleaning pipeline, and the liquid outlet of the residual liquid discharge pipeline is connected to the raw liquid tank.

[0015] Preferably, the filter cartridge is connected to the purified liquid tank through a precision filter.

[0016] Preferably, the purified liquid tank is respectively connected to the cleaning pipeline and the liquid outlet pipeline of the precision filter through a pump body and a filter.

[0017] Preferably, a discharge pipeline is provided at the bottom of the purified liquid tank. A purified liquid delivery pump and a valve body are provided on the discharge pipeline. Both the purified liquid delivery pump and the valve body of the discharge pipeline are electrically connected to a control system.

[0018] The present invention mainly achieves the following technical effects compared with the prior art:

[0019] By circulating and supplying the liquid in the clay pot to the filter cartridge, as the filter element filters the liquid in the clay pot, a diatomaceous earth filter cake will be formed outside the filter membrane of the filter element, effectively improving the filtering effect and enabling it to be applicable to the filtration of liquids with high viscosity and a large amount of impurities. In addition, the gas supplied through the first gas supply pipeline can press the original liquid in the cylinder back into the pipeline. After all the original liquid in the cylinder is pressed out, the cleaning pipeline can be opened to move from the inside of the filter element to the outside, removing the impurities on the filter element. The cleaning liquid carrying the impurities is discharged from the solid discharge port, realizing the regeneration of the filter element. Since there is no original liquid in the cylinder at this time, the waste of the original liquid is greatly reduced, saving the original liquid resources. At the same time, since the cleaning liquid moves from the inside to the outside, there is no pressure of the original liquid on the outside of the filter cake outside the filter element to support it, and the filter cake is more easily removed, improving the regeneration effect of the filter element.

[0020] The following technical effects are also achieved by other technical solutions of the present invention compared with the prior art:

[0021] After the original liquid in the cylinder is pressed out, the cooperation of the second gas supply pipeline and the exhaust pipeline realizes the circulation of gas in the cylinder, realizing the blowing and solidifying of the filter cake. At this time, the filter cake has reduced viscosity due to the lack of moisture. The gas from the third gas supply pipeline is used to blow air from the inside of the filter element to the outside, blowing off the filter cake and the impurities in the filter element, improving the regeneration effect of the filter element. At the same time, the impurities discharged from the solid discharge port have a lower water content, improving the convenience of cleaning and the convenience of subsequent sludge treatment.

[0022] Using the filtered purified liquid as the cleaning liquid, the liquid after cleaning does not need to be discharged and can be directly pressed back into the original liquid tank, without considering the influence of the residual liquid in the filter element after cleaning on the subsequent filtered liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is the system diagram of the automatic diatomaceous earth filtration system in the embodiment of the present invention;

[0025] Among them, 1. Original liquid tank; 2. Cross-flow tank; 3. Filter cartridge; 4. Precision filter; 5. Purified liquid tank; 6. Solid discharge port; 7. Cleaning pipeline; 8. First gas supply pipeline; 9. Pressure-back pipeline; 10. Discharge pipeline; 11. Cross-flow pipeline; 12. Second gas supply pipeline; 13. Third gas supply pipeline; 14. Residual liquid export pipeline; 15. Clay pot; 16. Filling tank. Detailed implementation manners

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] The object of the present invention is to provide a solid-liquid separation type diatomite filtration system to solve the problems existing in the prior art. Before discharging solids, the original liquid in the cylinder is pressed out by the air supply of the first air supply pipeline, reducing the waste of the original liquid during the solid discharge process, improving the regeneration effect, and at the same time, applying diatomite to form a filter cake on the filter element before filtration and performing diatomite feeding.

[0028] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0029] Please refer to as Figure 1As shown in the figure, a solid-liquid separation type diatomite filtration system is provided, which includes a raw liquid tank 1, a delivery pump, at least one filter cartridge 3, and a purified liquid tank 5 that are connected in sequence. The filter cartridge 3 includes a cylinder body and a filter element. The filter element is vertically arranged inside the cylinder body. The bottom of the cylinder body is provided with a solid discharge port 6 and a liquid inlet pipeline, and the top is provided with a liquid outlet pipeline 2 connected to the filter element and a cleaning pipeline 7 connected to the filter element. A solid discharge valve is arranged at the solid discharge port 6. The top inner cavity of the cylinder body is connected to a first air supply pipeline 8, and the bottom inner cavity of the cylinder body is connected to a pressure return pipeline 9. Valves are arranged on the liquid inlet pipeline of the cylinder body, the liquid outlet pipeline of the cylinder body, the cleaning pipeline 7, the first air supply pipeline 8, and the pressure return pipeline 9. The system also includes a coating tank 15 for containing liquid mixed with diatomite and a coating circulation pipeline. The bottom of the coating tank 15 is connected to the liquid inlet channel of the cylinder body through a circulation pump and a valve. One end of the coating circulation pipeline is located inside the coating tank 15, and the other end is connected to the filter element. A valve is arranged on the coating circulation pipeline. The working principle of this system is as follows: By circulating the liquid in the coating tank 15 to the filter cartridge 3, as the filter element circulates the liquid in the coating tank 15, a diatomite filter cake will be formed outside the filter element, effectively improving the filtration effect and enabling it to be applicable to the filtration of liquids with high viscosity and a large amount of impurities. In addition, the gas supplied through the first air supply pipeline 8 can press the raw liquid in the cylinder body into the pressure return pipeline 9. After all the raw liquid in the cylinder body is pressed out, the cleaning pipeline 7 is opened, and the cleaning liquid moves from the inside to the outside of the filter element, cleaning and removing the impurities on the filter element. The cleaning liquid carrying the impurities is discharged from the solid discharge port 6, realizing the regeneration of the filter element. Since there is no raw liquid in the cylinder body at this time, the waste of raw liquid is greatly reduced, saving raw liquid resources. At the same time, since the cleaning liquid moves from the inside to the outside, there is no pressure of the raw liquid outside the filter element to support it, and the filter element is easier to be cleaned, improving the regeneration effect of the filter element. After each regeneration is completed, the filter element needs to be coated with diatomite again.

[0030] A liquid level sensor is arranged at the bottom inner cavity of the coating tank 15. When the liquid level is low, it reminds the staff to add diatomite and supplement the liquid. The liquid mixed with diatomite can be the purified raw liquid after filtration.

[0031] The solid-liquid separation type diatomite filtration system also includes a dosing tank 16 for storing filter aids. The dosing tank 16 is connected to the liquid inlet pipeline of the cylinder body through a metering pump. For example, when there are more colloids or impurities in the raw liquid, the amount of diatomite added in the dosing tank 16 is increased to meet the filtration requirements.

[0032] The solid-liquid separation type diatomite filtration system further includes a cross-flow tank 2 and a cross-flow pipeline 11. The bottom of the cross-flow tank 2 is connected to the front pipeline of the delivery pump through a valve. One end of the cross-flow pipeline 11 is located at the bottom of the inner cavity of the cross-flow tank 2, and the other end is connected to the top of the inner cavity of the cylinder body. A valve is provided at the front end of the connection position between the cross-flow tank 2 and the front pipeline of the delivery pump, and a valve is provided on the cross-flow pipeline 11. Before filtration, first open the cross-flow pipeline 11, close the valve at the bottom of the cross-flow tank 2, use the delivery pump to supply the stock solution in the stock solution tank 1 into the cylinder body, and enter the cross-flow tank 2 through the cross-flow pipeline 11. After the cross-flow tank 2 stores a certain amount of stock solution, close the valve at the front end of the connection position between the cross-flow tank 2 and the front pipeline of the delivery pump, open the valve at the bottom of the cross-flow tank 2, and close the valve on the cross-flow pipeline 11. Use the cross-flow tank 2 as the tank for supplying the stock solution. The cross-flow tank 2 is equivalent to a buffer tank.

[0033] A liquid level sensor for detecting the current liquid level is provided at the bottom of the inner cavity of the cross-flow tank 2, and a tuning fork liquid level switch is provided at the top of the inner cavity. When the liquid level submerges the tuning fork liquid level switch, the control system receives the signal to close the valve at the front end of the connection position between the cross-flow tank 2 and the front pipeline of the delivery pump, open the valve at the bottom of the cross-flow tank 2, and close the valve on the cross-flow pipeline 11. At this time, the cross-flow tank 2 supplies the stock solution to the filter cartridge 3. When the liquid level reaches the liquid level sensor, the control system receives the signal to close the valve at the bottom of the cross-flow tank s2, open the cross-flow pipeline 11, and the stock solution in the stock solution tank 1 is transported by the delivery pump, flows through the filter cartridge 3, and enters the cross-flow tank 2 through the cross-flow pipeline 11, and circulates in this way.

[0034] A second air supply pipeline 12 is connected to the bottom of the inner cavity of the cylinder body, and a third air supply pipeline 13 connected to the filter element is provided at the top of the cylinder body. Valves are provided on both the second air supply pipeline 12 and the third air supply pipeline 13. The cooperation of the second air supply pipeline 12 and the exhaust pipeline realizes the circulation of gas in the cylinder body and realizes the blowing and solidifying of the filter cake. At this time, the filter cake has reduced viscosity due to the lack of moisture. Use the gas from the third air supply pipeline 13 to blow air from the inside to the outside of the filter element, blow off the filter cake and the impurities in the filter element, improve the regeneration effect of the filter element, and at the same time, the moisture content of the sundries discharged from the solid discharge port 6 is relatively low, which is beneficial to the convenience of subsequent solid matter treatment.

[0035] The first air supply pipeline 8 and the second air supply pipeline 12 share a main air supply pipeline. Pressure regulating valves for controlling pressure are provided on both the first air supply pipeline 8 and the third air supply pipeline 13. The first air supply pipeline 8 and the third air supply pipeline 13 are both connected to the compressed gas supply equipment through the main air supply pipeline, and the compressed gas can be provided by an air compressor.

[0036] Branches are provided on the first air supply pipeline 8 and the third air supply pipeline 13 and are connected to the liquid outlet end of the precision filter 4. The precision filter 4 can be regenerated by backwashing, and a valve is provided on the branch.

[0037] A filter can be installed at the inlet of the main supply pipeline to improve the cleanliness of the compressed gas.

[0038] A gas storage tank is installed between the main supply pipeline and the compressed gas supply equipment to play a buffering role.

[0039] A residual liquid discharge pipeline 14 is installed at the top of the cylinder body. The liquid inlet of the residual liquid discharge pipeline 14 is located at the bottom of the inner cavity of the filter element, and the liquid outlet is located outside the cylinder body. The cooperation between the second supply pipeline 12 and the residual liquid discharge pipeline 14 can discharge the residual liquid in the filter element, ensuring that there is no residual liquid in the filter element after shutdown or after cleaning with the cleaning liquid.

[0040] The purification liquid tank 5 is connected to the cleaning pipeline 7, using the original liquid as the cleaning liquid. The power of the cleaning liquid comes from the transfer pump. In this way, there is no need to consider the impact of the residual liquid in the filter element after cleaning on the subsequent filtered liquid. Only after shutdown, the residual liquid in the filter element can be discharged by using the residual liquid discharge pipeline 14 and the second supply pipeline 12 to avoid waste of the original liquid. On the basis of using the original liquid as the cleaning liquid, the liquid outlet of the residual liquid discharge pipeline 14 can be connected to the original liquid tank 1 to import the residual original liquid into the original liquid tank 1 for standby. In the case of setting up the cross-flow tank 2, the liquid outlet of the residual liquid discharge pipeline 14 can be connected to the cross-flow tank 2.

[0041] The residual liquid discharge pipeline 14 and the clay coating circulation pipeline can share a connecting pipe to communicate with the filter element.

[0042] The filter cartridge 3 is connected to the purification liquid tank 5 through the precision filter 4, which is equivalent to filtering the original liquid by means of secondary filtration.

[0043] The pipeline between the precision filter 4 and the purification liquid tank 5 is connected to the cleaning pipeline 7. Valves are installed on both the connecting pipeline between the precision filter 4 and the cleaning pipeline 7 and the connecting pipeline between the precision filter 4 and the purification liquid tank 5, and the opening and closing of the relevant pipelines can be controlled by controlling the opening and closing of the valves.

[0044] The purification liquid tank 5 is connected to the cleaning pipeline 7 and the liquid outlet pipeline of the precision filter 4 through the pump body and the filter respectively. The setting of the pump body and the filter enables the overall system to complete a major cleaning regularly, that is, the filtered liquid in the purification liquid tank 5 is pumped to the precision filter 4 and the filter cartridge 3 by the pump body and the filter to synchronously backwash the filter elements of both.

[0045] A discharge pipeline 10 is provided at the bottom of the purification liquid tank 5. A purified liquid transfer pump and a valve body are provided on the discharge pipeline 10. A liquid level sensor is provided at the bottom of the inner cavity of the purification liquid tank 5, and a liquid level switch is provided at the top of the inner cavity. The purified liquid transfer pump, the valve body of the discharge pipeline 10, the liquid level sensor, and the tuning fork liquid level switch are all electrically connected to the control system. When the liquid level submerges the tuning fork liquid level switch, the control system receives the signal and turns on the purified liquid transfer pump and the valve body of the discharge pipeline 10. At this time, the purified liquid in the purification liquid tank 5 is discharged and collected, and then transported to the subsequent processing procedure. When the liquid level reaches the liquid level sensor, the control system receives the signal to turn off the purified liquid transfer pump and the valve body of the discharge pipeline 10, and stops the continuous discharge of the purified liquid, and cycles in this way.

[0046] In the case where the cross-flow tank 2 is provided, the pressure-back pipeline 9 can be connected to the cross-flow tank 2, and the pressure-back stock solution enters the cross-flow tank 2 and is stored. At the same time, in order to improve the pressure-back effect of the stock solution, the liquid inlet of the pressure-back pipeline 9 should be arranged close to the bottom end of the inner cavity of the cylinder body.

[0047] The liquid outlet ends of multiple filter elements in the cylinder body are communicated with a summary pipeline, which collects and exports the filtered liquid of multiple filter elements. The liquid outlet pipeline, the cleaning pipeline 7, and the third air supply pipeline 13 of the cylinder body are all connected to the filter elements through the liquid outlet of the summary pipeline of several filter elements. Specifically, the liquid outlet pipeline, the cleaning pipeline 7, the third air supply pipeline 13, and the summary pipeline are connected through a four-way joint.

[0048] In order to reduce the punching of the bottom of the cylinder body, the pressure-back pipeline 9 and the liquid inlet pipeline are connected to the bottom of the inner cavity of the cylinder body through a connecting pipe.

[0049] In this embodiment, a plurality of filter cartridges 3 are arranged in parallel between the transfer pump and the precision filter 4. The multiple filter cartridges 3 work alternately or synchronously. When a filter cartridge 3 is being regenerated, other filter cartridges 3 need to be in a working state to improve the working efficiency of the system. In the working condition of multiple filter cartridges 3 arranged in parallel, since the filtered stock solution continuously enters the precision filter 4 and then enters the purification liquid tank 5 from the precision filter 4, at this time, there is no need to set a transfer pump on the cleaning pipeline 7, and the power is provided by the transfer pump at the front end of the filter cartridge 3 in the working state (the valve between the precision filter 4 and the purification liquid tank 5 needs to be closed; when only one filter cartridge 3 or multiple filter cartridges 3 are arranged in parallel, a transfer pump needs to be set on the cleaning pipeline 7 to provide power).

[0050] The liquid outlet pipeline of the cylinder body and the liquid outlet pipeline of the precision filter 4 are both connected to the cross-flow tank 2 through branch pipelines, which are used to re-feed the filtered liquid into the cross-flow tank 2 for repeated filtration to improve the filtration effect. Valves are provided on the branch pipelines.

[0051] The liquid outlet pipeline of the purification liquid tank 5 is connected to the stock solution tank 1 through a branch pipeline, and the purified liquid can be re-fed into the stock solution tank 1 to wait for re-filtration.

[0052] A flow meter is provided on the liquid outlet pipeline of the cylinder body to detect the flow rate in real time. When the flow rate decreases, it indicates that the filter element in the cylinder body is blocked. A flow meter is also provided on the liquid outlet pipeline of the purification liquid tank 5 to detect the total liquid outlet flow rate.

[0053] Each valve in this system is controlled by a control system to improve the automation degree of the system.

[0054] During actual use, the original liquid in the original liquid tank is first transported by a transfer pump and stored in the cross-flow tank. When the cross-flow tank is filled to a set value, the cross-flow tank uses the transfer pump to supply the original liquid into the cylinder body. After the original liquid passes through the filter element and the precision filter in sequence, it enters the purification liquid tank for storage. Before filtration, the circulating pump needs to be started to supply the liquid in the coating tank 15 into the filter element to form a filter cake; when the filter element is regenerated, the following steps are required:

[0055] S1: The control system controls the stop of the liquid inlet of the liquid inlet pipeline, opens the pressure return pipeline 9 and the first gas supply pipeline 8. The gas enters the cylinder body and occupies the space in the cylinder body. The original liquid in the cylinder body is pressed out from the pressure return pipeline 9 and enters the cross-flow tank. The pressed-out original liquid is collected and waiting for the next filtration;

[0056] S2: After the original liquid is pressed out, the control system controls the closing of the pressure return pipeline 9 and the first gas supply pipeline 8, opens the second gas supply pipeline 12 and the exhaust pipeline. When the gas moves from bottom to top, it passes through the position where the filter element is located, and the filter cake is blown and solidified by the way of air flow;

[0057] S3: After the blowing and solidifying is completed, the second gas supply pipeline 12 and the exhaust pipeline are closed, the third gas supply pipeline 13 and the solid discharge valve are opened, and the filter cake is blown off and discharged;

[0058] S4: After the filter cake is discharged, the third gas supply pipeline 13 and the solid discharge valve are closed, the cleaning pipeline and the pressure return pipeline 9 are opened. The original liquid flows from the filter element into the cylinder body, which is opposite to the flow direction of the filtered liquid, realizing backwashing and cleaning the residual impurities in the filter membrane of the filter element;

[0059] If the system needs to be shut down subsequently, after the cleaning in step S4 is completed, the cleaning pipeline is closed, the first gas supply pipeline 8 is opened, and the original liquid in the cylinder body is pressed out and enters the cross-flow tank; after the original liquid is pressed out, the first gas supply pipeline 8 and the pressure return pipeline 9 are closed, the second gas supply pipeline 12 and the residual liquid discharge pipeline 14 are opened, the gas enters the inner cavity of the filter element from the cylinder body. As the gas in the inner cavity of the filter element increases, the residual liquid in the filter element is pressed out from the filter element, realizing the export of the residual liquid in the filter element to the cross-flow tank.

[0060] If re-filtration is required after regeneration, the filter element needs to be pre-coated with soil again.

[0061] Adaptations made according to actual needs are all within the scope of protection of the present invention.

[0062] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0063] Specific examples are used in the present invention to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A solid-liquid separation type diatomaceous earth filtration system, characterized in that, It includes a stock solution tank, a transfer pump, at least one filter cartridge, and a purified liquid tank that are connected in sequence. The filter cartridge includes a cylinder body and a filter element. The filter element is vertically arranged in the cylinder body. The bottom of the cylinder body is provided with a solid discharge port and a liquid inlet pipeline, and the top is provided with a liquid outlet pipeline communicating with the filter element and a cleaning pipeline communicating with the filter element. A solid discharge valve is arranged at the solid discharge port. The top inner cavity of the cylinder body is connected to a first air supply pipeline, and the bottom inner cavity of the cylinder body is connected to a pressure return pipeline. Valves are arranged on the liquid inlet pipeline of the cylinder body, the liquid outlet pipeline of the cylinder body, the cleaning pipeline, the first air supply pipeline, and the pressure return pipeline; When multiple filter cartridges are provided, the multiple filter cartridges are arranged in parallel; It further includes a coating tank for storing the liquid mixed with diatomaceous earth and a coating circulation pipeline. The bottom of the coating tank is connected to the liquid inlet channel of the cylinder body through a circulation pump and a valve. One end of the coating circulation pipeline is located in the coating tank, and the other end is connected to the filter element. A valve is arranged on the coating circulation pipeline.

2. The solid-liquid separation type diatomaceous earth filtration system according to claim 1, wherein The diatomaceous earth filtration system further includes a dosing tank for storing filter aid. The dosing tank is connected to the liquid inlet pipeline of the cylinder body through a metering pump.

3. The solid-liquid separation type diatomite filtration system according to claim 1, wherein, The solid-liquid separation type diatomaceous earth filtration system further includes a cross-flow tank and a cross-flow pipeline. The bottom of the cross-flow tank is connected to the pipeline in front of the transfer pump through a valve. One end of the cross-flow pipeline is located at the bottom inner cavity of the cross-flow tank, and the other end is connected to the top inner cavity of the cylinder body. A valve is arranged at the front end of the connection position between the cross-flow tank and the pipeline in front of the transfer pump. A valve is arranged on the cross-flow pipeline.

4. The solid-liquid separation type diatomite filtration system according to claim 3, wherein The bottom inner cavity of the cylinder body is connected to a second air supply pipeline, and the top of the cylinder body is provided with a third air supply pipeline communicating with the filter element. Valves are arranged on the second air supply pipeline and the third air supply pipeline.

5. The solid-liquid separation type diatomite filtration system according to claim 4, characterized in that, The first air supply pipeline and the second air supply pipeline share a common air supply pipeline 1. Pressure regulating valves for controlling pressure are arranged on the common air supply pipeline 1 and the third air supply pipeline. The common air supply pipeline 1 and the third air supply pipeline are both connected to a compressed gas supply device.

6. The solid-liquid separation type diatomite filtration system according to claim 4, characterized in that, The top of the cylinder body is provided with a residual liquid discharge pipeline. The liquid inlet of the residual liquid discharge pipeline is located at the bottom inner cavity of the filter element, and the liquid outlet is located outside the cylinder body.

7. The solid-liquid separation type diatomite filtration system according to claim 6, wherein The purified liquid tank is connected to the cleaning pipeline, and the liquid outlet of the residual liquid discharge pipeline is connected to the stock solution tank.

8. The solid-liquid separation type diatomaceous earth filtration system according to claim 1, wherein, The filter cartridge is connected to the purified liquid tank through a precision filter.

9. The solid-liquid separation type diatomite filtration system according to claim 8, characterized in that, The purified liquid tank is connected to the cleaning pipeline and the liquid outlet pipeline of the precision filter through a pump body and a filter respectively.

10. The solid-liquid separation type diatomaceous earth filtration system according to claim 1, characterized in that, The bottom of the purified liquid tank is provided with a discharge pipeline. A purified liquid transfer pump and a valve body are arranged on the discharge pipeline. The purified liquid transfer pump and the valve body of the discharge pipeline are both electrically connected to a control system.

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