CN216630350U - Ceramic membrane salt water filtration system with back flush function - Google Patents
Ceramic membrane salt water filtration system with back flush function Download PDFInfo
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- CN216630350U CN216630350U CN202123183986.5U CN202123183986U CN216630350U CN 216630350 U CN216630350 U CN 216630350U CN 202123183986 U CN202123183986 U CN 202123183986U CN 216630350 U CN216630350 U CN 216630350U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A ceramic membrane brine filtration system with a back washing function comprises a brine coarse filtration pipeline, wherein a membrane filtration feed pump and a brine coarse filter are sequentially arranged on the brine coarse filtration pipeline, the output end of the brine coarse filter is connected with a brine fine filtration pipeline, a membrane filtration circulating pump and an inorganic membrane brine filter are arranged on the brine fine filtration pipeline, and the inorganic membrane brine filter is connected with the brine fine filtration pipeline through a circulation pipeline to form a circulation passage; and a back flushing pipeline is connected to a refined brine output pipeline of the inorganic membrane brine filter, a back flushing tank is installed on the back flushing pipeline, and the back flushing tank is connected with a compressed air pipeline. The ceramic membrane brine filtering system with the back flushing function can automatically back flush on line and pickle under pressure off line, and ensures that filtering equipment can normally and effectively operate for a long time.
Description
Technical Field
The utility model relates to brine filtering equipment, in particular to a ceramic membrane brine filtering system with a back-washing function.
Background
The primary brine refining process of the brine filtering process comprises double-alkali refining and density difference precipitation solid-liquid separation, wherein the main equipment of the density difference solid-liquid separation device is a dalton clarifying tank. And pumping the crude salt water in the salt dissolving pool to a flocculant elevated tank through a crude salt water pump, adding a flocculant TXY into the crude salt water, then overflowing to a Douler clarifying tank, and flocculating and settling under the reaction action of TXY. The brine overflows to the refined brine accepting tank on the upper part of the dalwood clarifying tank, the refined brine in the refined brine accepting tank passes through a PE filter feeding pumping PE pipe filter, the refined brine filtered by the PE filter enters a refined brine storage tank, the salt mud discharged by backwashing on the bottom of the PE filter enters a salt mud accepting tank, and the salt mud discharged by flocculation and sedimentation on the bottom of a central barrel of the dalwood clarifying tank enters the salt mud accepting tank and is recycled after being filter-pressed by a salt mud pumping filter press.
The prior art equipment area is big, overhauls the risk height, and dall depositing reservoir specification is: φ 17000 × 13147, V =1158.6m3The material is carbon steel and epoxy resin for seepage prevention, after the service life is too long, the seepage prevention layer can be damaged, the carbon steel plate is corroded, the SS and iron ion content in brine seriously exceeds the standard, the voltage of an electrolytic bath rises, the electrolytic efficiency is reduced quickly, the direct current consumption of caustic soda rises, the operation cost of the caustic soda device is increased, and the safe and stable operation of the electrolytic device is influenced. The device leads to the salt mud more after adding high efficiency flocculant because of density difference precipitation method solid-liquid separation in the use now, uses PE filter now to filter, and every filter has 800 PE pipes, and every filter need change 3 PE pipes every year, and 800X3=2400, and every PE filter need change 2400 PE pipes every year, and the salt mud belongs to the useless needs of danger and handles, and salt mud and PE pipe belong to the useless needs of danger and handle qualifiedly, have increased the cost of enterprise.
The ceramic membrane salt water filtration technology is that after the crude salt water after complete reaction is filtered by a 50nm filtration precision ceramic membrane filter for one time, calcium carbonate, magnesium hydroxide and water insoluble substances are all trapped by the 50nm filtration precision ceramic membrane filter for one time, so that the total content of calcium and magnesium ions in the refined salt water is less than 1ppm and SS is less than 1 ppm. The ceramic membrane filtration adopts a cross-flow filtration process, namely crude brine flows on the surface of the membrane in a mode parallel to the membrane and enters the side of refined brine under the action of osmotic pressure, and calcium carbonate, magnesium hydroxide and SS are intercepted by the membrane layer and flow through the next stage along with the crude brine for filtration again. The process has the advantages that calcium carbonate, magnesium hydroxide and SS are not easy to enrich on the surface of the membrane, the membrane flux can be kept at a higher level for a long time, the attenuation period is long, the filtration precision is high, and the calcium carbonate, the magnesium hydroxide and the SS in the refined brine can be always kept below 1ppm within 5 years.
However, due to long-time operation, magnesium hydroxide and calcium carbonate can form bridges in recesses of the membrane surface to influence the membrane flux; meanwhile, a small amount of solid particles with the particle size of less than 50nm still exist in the process of forming the particle size of the calcium carbonate and the magnesium hydroxide, and the solid particles can enter a membrane layer, a filter layer and a support body under the action of osmotic pressure, and the continuous accumulation can finally cause the attenuation of membrane flux.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a ceramic membrane brine filtration system with a backwashing function, which can perform backwashing and acid washing and ensure that the membrane flux of an inorganic membrane brine filter is completely recovered.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
a ceramic membrane brine filtration system with a back washing function comprises a brine coarse filtration pipeline, wherein a membrane filtration feed pump and a brine coarse filter are sequentially arranged on the brine coarse filtration pipeline, the output end of the brine coarse filter is connected with a brine fine filtration pipeline, a membrane filtration circulating pump and an inorganic membrane brine filter are arranged on the brine fine filtration pipeline, and the inorganic membrane brine filter is connected with the brine fine filtration pipeline through a circulation pipeline to form a circulation passage; and a refined brine output pipeline of the inorganic membrane brine filter is connected with a back flushing pipeline, a back flushing tank is arranged on the back flushing pipeline, and the back flushing tank is connected with a compressed air pipeline.
The impurity output pipeline of the inorganic membrane brine filter is provided with a pickling solution storage tank through a branch pipe, and the pickling solution storage tank is connected with the inorganic membrane brine filter through a pickling solution pump and an off-line circulating pipeline.
And a static mixer is arranged on the refined brine output pipeline and is connected with a sodium sulfite preparation device.
The sodium sulfite preparation device comprises a sulfurous acid conveying pipeline, and a sodium sulfite preparation tank, a sodium sulfite solution pump, a sodium sulfite storage tank and a sodium sulfite metering pump are sequentially arranged on the sulfurous acid conveying pipeline.
The utility model relates to a ceramic membrane brine filtering system with a backwashing function, which has the following technical effects:
1) and an online full-automatic flushing system is arranged, namely the refined brine is reversely flushed from the permeation side to the crude brine side under the action of 0.55-0.65 Mpa of compressed air pressure, so that calcium carbonate and magnesium hydroxide existing on the surface of the membrane are stripped off and the membrane is discharged out of the system along with concentrated brine.
2) By arranging the off-line pressure circulating pickling process, the method has the advantages that the pressure circulating pickling can more thoroughly react calcium carbonate and magnesium hydroxide existing on the membrane channel and the membrane surface, so that the flux is completely recovered.
3) The quality of the refined brine is stable, reliable guarantee is provided for subsequent electrolysis, the quality of the refined brine is monitored on line in real time, and the full automation degree is high.
Drawings
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: the device comprises a membrane filtration feed pump 1, a brine coarse filter 2, a membrane filtration circulating pump 3, an inorganic membrane brine filter 4, a static mixer 5, a back flush tank 6, a pickling solution storage tank 7, a pickling solution pump 8, a sodium sulfite preparation tank 9, a sodium sulfite solution pump 10, a sodium sulfite storage tank 11, a sodium sulfite metering pump 12, a brine coarse filtration pipeline 13, a brine fine filtration pipeline 14, a circulation pipeline 15, a refined brine output pipeline 16, a back flush pipeline 17, a compressed air pipeline 18, an impurity output pipeline 19, an off-line circulation pipeline 20 and a sulfurous acid conveying pipeline 21.
Detailed Description
As shown in fig. 1, a ceramic membrane brine filtration system with a back washing function comprises a brine rough filtration pipeline 13, wherein a membrane filtration feed pump 1 and a brine rough filter 2 are sequentially installed on the brine rough filtration pipeline 13, and a pipeline at the inlet end of the membrane filtration feed pump 1 is connected with two branches, wherein one branch is used for inputting sodium hypochlorite (C in the place indicates that 10% NaClO comes from outside), and the other branch is used for inputting crude brine (D in the place indicates that brine comes from salt formed outside).
The output end of the brine coarse filter 2 is connected with a brine fine filtering pipeline 14, and a membrane filtration circulating pump 3 and an inorganic membrane brine filter 4 are arranged on the brine fine filtering pipeline 14. The circulating outlet of the inorganic membrane brine filter 4 is connected with the brine fine filtering pipeline 14 through the circulating pipeline 15, and the interface is positioned on one side of the inlet of the membrane filtration circulating pump 3. Thus, the brine fine filtration pipeline 14, the membrane filtration circulation pump 3, the inorganic membrane brine filter 4 and the circulation pipeline 15 form a circulation passage for circulating filtration.
Here, the circulation line 15 is connected to the refined brine tank through a third branch line (the part B indicates an out-of-range refined brine tank).
The refined brine output port of the inorganic membrane brine filter 4 is connected with a refined brine output pipeline 16, a static mixer 5 is installed on the refined brine output pipeline 16, and the output end of the static mixer 5 is connected with a refined brine tank (the F position indicates that the refined brine goes out of the refined brine tank).
The device is prepared with sodium sulfite through the pipeline and is connected in 5 tops of static mixer, the sodium sulfite is prepared the device and is included sulfurous acid conveying line 21, installs sodium sulfite preparation tank 9, sodium sulfite solution pump 10, sodium sulfite storage tank 11 and sodium sulfite measuring pump 12 on the sulfurous acid conveying line 21 in proper order. Wherein, the upper end of the sodium sulfite preparation tank 9 is connected with a fourth branch, and the fourth branch is used for inputting pure water (A indicates that the pure water comes from outside). Thus, is used to add sodium sulfite to the static mixer 5 to remove free chlorine from the refined brine.
A back flushing pipeline 17 is connected to the refined brine output pipeline 16, a back flushing tank 6 is installed on the back flushing pipeline 17, and the back flushing tank 6 is connected with a compressed air pipeline 18 (the position E shows that compressed air comes from a battery compartment). This allows for back flushing when bridges are formed on the membrane surface.
An impurity output pipeline 19 (a position G shows a salt mud tank which is out of the boundary) of the inorganic membrane brine filter 4 is provided with a pickling solution storage tank 7 through a branch pipe, and the pickling solution storage tank 7 is connected with the inorganic membrane brine filter 4 through a pickling solution pump 8 and an off-line circulation pipeline 20. The inorganic membrane brine filter 4 is divided into three-stage filtration, hydrochloric acid in the pickling solution storage tank 7 enters from a third-stage membrane group, passes through a second-stage membrane group and then enters a first-stage membrane group, the second-stage membrane group and the third-stage membrane group can be discharged through the permeation side and the liquid accumulation cavity of the second-stage membrane group and then returns to the pickling solution storage tank 7 for pickling the second-stage membrane group, the first-stage membrane group can also be pickled through the permeation side and the liquid accumulation cavity of the first-stage membrane group and then returns to the pickling solution storage tank 7 for pickling the first-stage membrane group, and the first-stage membrane group, the second-stage membrane group and the third-stage membrane group can also be pickled simultaneously, so that the inorganic membrane brine filter 4 can be circularly pickled, and a small amount of solid particles with the particle size of less than 50nm are removed.
The working principle and the process are as follows:
a. crude filtration of brine
The membrane filtration feed pump 1 sends the saturated crude salt water after the reaction to a salt water coarse filter 2 for coarse filtration, and solid particles with the particle size larger than 0.6mm are intercepted. The saturated salt water after rough filtration enters a membrane filtration circulating pump 3. The brine coarse filter 2 is provided with a full-automatic online backwashing system, so that online periodic slag discharge and backwashing can be realized, and solid matters intercepted by the brine coarse filter 2 are discharged into an outdoor brine sludge tank.
b. Fine filtration of crude brine
The crude brine in the membrane filtration circulating pump 3 is sent to an inorganic membrane brine filter 4 through the membrane filtration circulating pump 3, most of concentrated brine with the solid content of 10 percent enters an inlet of the membrane filtration circulating pump 3 after three-stage concentration, the concentrated brine enters the inorganic membrane brine filter 4 after being pressurized by the membrane filtration circulating pump 3 to continue circulating filtration, and a small part of the concentrated brine is discharged to an out-of-service brine sludge tank. The refined brine SS from the inorganic membrane filter 4 is less than 1ppm, flows into the static mixer 5 through the pressure of the membrane group, sodium sulfite is added into the inlet of the static mixer 5 through a sodium sulfite metering pump 12, the sodium sulfite and the brine are uniformly mixed through the static mixer 5, and then the refined brine enters an external refined brine storage tank after free chlorine is removed.
c. On-line full-automatic back flushing
And (3) timing the filtration period of the inorganic membrane brine filter 4, automatically judging whether the liquid level of the backflushing tank 6 meets the backflushing requirement by the program, if not, entering an automatic liquid supplementing program to enable the liquid level of the backflushing tank 6 to reach a high limit, pressurizing by compressed air, entering an automatic backflushing program, and timing again for filtration after the flux of the inorganic membrane brine filter 4 is recovered.
d. Off-line pressure circulating acid washing regeneration
After the inorganic membrane filter 4 runs for a long time, the capacity requirement cannot be met through on-line full-automatic back flushing, and at the moment, the inorganic membrane brine filter needs to be subjected to off-line pressurized circulating pickling. Firstly, 10-15% hydrochloric acid is prepared in a pickling solution storage tank 7, a pickling solution pump 8 is started to send pickling solution into an inorganic membrane brine filter 4, the pickling pressure is controlled to be 0.15MPa by adjusting the bottom of the inorganic membrane brine filter 4 to a discharge valve of the pickling solution storage tank 7, and the flux of the inorganic membrane brine filter 4 can be completely recovered after cross flow and terminal pickling are completed through belt pressure circulation.
e. Preparation and addition of sodium sulfite
The required amount of solid sodium sulfite is calculated according to the concentration of 5 percent, the solid sodium sulfite is poured into a sulfurous acid preparation tank 9, after being fully dissolved by mechanical stirring, the solid sodium sulfite is sent to a sodium sulfite storage tank 11 by a sodium sulfite solution pump 10, enters an inlet of a static mixer 5 by a sodium sulfite metering pump 12, is fully mixed with refined brine to remove free chlorine in the refined brine, and then enters an external refined brine storage tank.
Claims (4)
1. The utility model provides a ceramic membrane brine filtration system with back flush function which characterized in that: the device comprises a brine coarse filtering pipeline (13), wherein a membrane filtering feed pump (1) and a brine coarse filter (2) are sequentially arranged on the brine coarse filtering pipeline (13), the output end of the brine coarse filter (2) is connected with a brine fine filtering pipeline (14), a membrane filtering circulating pump (3) and an inorganic membrane brine filter (4) are arranged on the brine fine filtering pipeline (14), and the inorganic membrane brine filter (4) is connected with the brine fine filtering pipeline (14) through a circulating pipeline (15) to form a circulating path; a back flush pipeline (17) is connected to a refined brine output pipeline (16) of the inorganic membrane brine filter (4), a back flush tank (6) is installed on the back flush pipeline (17), and the back flush tank (6) is connected with a compressed air pipeline (18).
2. The ceramic membrane brine filtration system with backwashing function as claimed in claim 1, wherein: the impurity output pipeline (19) of the inorganic membrane brine filter (4) is provided with a pickling solution storage tank (7) through a branch pipe, and the pickling solution storage tank (7) is connected with the inorganic membrane brine filter (4) through a pickling solution pump (8) and an off-line circulating pipeline (20).
3. The ceramic membrane brine filtration system with backwashing function as claimed in claim 1, wherein: and a static mixer (5) is arranged on the refined brine output pipeline (16), and the static mixer (5) is connected with a sodium sulfite preparation device.
4. The ceramic membrane brine filtration system with backwashing function as claimed in claim 3, wherein: the sodium sulfite preparation device comprises a sulfurous acid conveying pipeline (21), and a sodium sulfite preparation tank (9), a sodium sulfite solution pump (10), a sodium sulfite storage tank (11) and a sodium sulfite metering pump (12) are sequentially installed on the sulfurous acid conveying pipeline (21).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123183986.5U CN216630350U (en) | 2021-12-17 | 2021-12-17 | Ceramic membrane salt water filtration system with back flush function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123183986.5U CN216630350U (en) | 2021-12-17 | 2021-12-17 | Ceramic membrane salt water filtration system with back flush function |
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| Publication Number | Publication Date |
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| CN216630350U true CN216630350U (en) | 2022-05-31 |
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| CN202123183986.5U Active CN216630350U (en) | 2021-12-17 | 2021-12-17 | Ceramic membrane salt water filtration system with back flush function |
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