Regeneration process to extend the service life of ceramic membrane system for brine refining

Abstract

The present invention discloses a regeneration process for extending the service life of a salt water refined ceramic membrane system, and relates to the technical field of inorganic ceramic membrane regeneration process; in order to facilitate and quickly process the ceramic membrane; specifically includes three inorganic ceramic membrane filters, a salt tank, a recoil mechanism and a hydrochloric acid recovery box, the inorganic ceramic membrane filter includes a filter housing, an inorganic ceramic membrane, a permeation side housing is provided in the filter housing, the inorganic ceramic membrane is located in the permeation side housing, and the inorganic ceramic membrane and the permeation side housing constitute a permeation side, the filter housing top and bottom are both equipped with sealing covers, three inorganic ceramic membrane filters are respectively connected to a series structure through a series pipeline, and the input end of the inorganic ceramic membrane filter at one end is connected to a water inlet pipe. The present invention can recycle the inorganic ceramic membrane, extend its service life and service life, and can extend its use by 1-2 years even in the worst salt quality, with obvious effect, convenient and reliable operation.

Description

Technical Field

[0001] The invention relates to the technical field of inorganic ceramic membrane regeneration technology, and in particular to a regeneration technology for extending the service life of a brine refining ceramic membrane system. Background Art

[0002] Ceramic membrane filter is a set of precision super filtration and purification equipment that can be widely used in various fields; its core component, inorganic ceramic membrane, has excellent thermal stability and pore stability, not only has high strength, but also is resistant to chemical corrosion and has good cleaning and regeneration performance, and has the dual advantages of high-efficiency filtration and precision filtration; currently, the primary brine filtration device in the chlor-alkali industry is divided into organic membrane process and inorganic ceramic membrane process; among them, the inorganic ceramic membrane regeneration process determines the use cycle and service life of the ceramic membrane tube. At present, water washing is mostly used to extend the service life of the inorganic ceramic membrane. Although it has achieved certain effects, it still needs to be improved.

[0003] After searching, the Chinese patent application number CN201720269028.4 discloses an offline regeneration device for ceramic membranes, including a device body, a hot air heating furnace, a fan, and a ceramic membrane support platform; the hot air heating furnace outlet is connected to the fan inlet, the fan outlet is connected to the device body, and supplies air into the device body, the device body has a built-in cavity, and is provided with an opening and closing door, the ceramic membrane support platform enters and exits the device body through the opening and closing door, and is located above the air outlet. The offline regeneration device in the above patent has the following shortcomings: it can effectively remove pollutants attached to the membrane surface by drying and dehydrating the ceramic diaphragm and burning the diaphragm, and realize the regeneration and recovery of the ceramic membrane assembly. When it is implemented again, the ceramic membrane assembly needs to be disassembled, which makes the handling more cumbersome, so it needs to be improved. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a regeneration process for extending the service life of a brine refining ceramic membrane system.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A regeneration process for extending the service life of a brine refining ceramic membrane system comprises three inorganic ceramic membrane filters, a salt treatment tank, a recoil mechanism and a hydrochloric acid recovery tank, wherein the inorganic ceramic membrane filter comprises a filter housing and an inorganic ceramic membrane, wherein a permeation side housing is arranged in the filter housing, the inorganic ceramic membrane is arranged in the permeation side housing, and a permeation side is formed between the inorganic ceramic membrane and the permeation side housing, sealing covers are installed on the top and bottom of the filter housing, and the three inorganic ceramic membrane filters respectively form a series structure through series pipes, and the input end of the inorganic ceramic membrane filter at one end is connected to a water inlet pipe, and the output end of the inorganic ceramic membrane filter at the other end is connected to a drain pipe, and a water inlet main valve and a drain main valve are respectively arranged on the water inlet pipe and the drain pipe; a permeation side drainage pipe is arranged on one side of the three inorganic ceramic membrane filters, and a permeation clear liquid port and a permeation emptying port are arranged on the three inorganic ceramic membrane filters, and the permeation clear liquid port is connected to the recoil mechanism, and the permeation side drainage pipe is provided with three input ends and two output ends. The permeate side drain pipe is connected to the permeate outlet of the three inorganic ceramic membrane filters, and the three input ends of the permeate side drain pipe are respectively provided with a primary permeation valve, a secondary permeation valve and a tertiary permeation valve, one output end of the permeate side drain pipe is connected to the input end of the hydrochloric acid recovery tank, the other output end of the permeate side drain pipe is connected to the salt pool, and the two output ends of the permeate side drain pipe are respectively provided with a hydrochloric acid tank return valve and a salt pool return valve, one of the hydrochloric acid recovery tanks is connected to the input end of the hydrochloric acid recovery tank, and the other output end of the permeate side drain pipe is connected to the salt pool, and the two output ends of the permeate side drain pipe are respectively provided with a hydrochloric acid tank return valve and a salt pool return valve, and one of the hydrochloric acid recovery tanks is connected to the input end of the hydrochloric acid recovery tank. A hydrochloric acid discharge pipe with a hydrochloric acid discharge valve is installed at one end, one end of the hydrochloric acid discharge pipe is connected to the drain pipe, the drain pipe is provided with two output ports, one of the output ports of the drain pipe is introduced into the salt pool; a circulation pipe is arranged in the salt pool, one end of the circulation pipe is connected to the water inlet pipe, and the circulation pipe is also provided with a circulation pump, a brine inlet valve and a pressure gauge; an acid inlet pipe is installed on the outer wall of one side of the hydrochloric acid recovery box, an acid pump is arranged on the acid inlet pipe, the acid inlet pipe is connected with the water inlet pipe, and an acid inlet valve is installed on the acid inlet pipe.

[0007] Preferably: the recoil mechanism comprises a recoil tank and an air compressor, the air compressor is connected to the input end of the recoil tank through a pipeline, a recoil pipeline is installed at the output end of the recoil tank, the recoil pipeline is provided with three branches, the permeate clear liquid ports of the three inorganic ceramic membrane filters are respectively connected to the three branches through pipelines, and the three branches of the recoil pipeline are respectively provided with a primary shut-off valve, a secondary shut-off valve and a tertiary shut-off valve, as well as a primary hand valve, a secondary hand valve and a tertiary hand valve; observation windows are also provided on the three branches of the recoil pipeline; the recoil pipeline is provided with two output ends, one of which is connected to the recoil tank, and a regulating valve is provided on the other output end of the recoil pipeline.

[0008] Furthermore: the water inlet pipe and the series pipe are respectively provided with a primary discharge pipe, a secondary discharge pipe and a tertiary discharge pipe at the input end near the three inorganic ceramic membrane filters, and the primary discharge pipe, the secondary discharge pipe and the tertiary discharge pipe are respectively provided with a primary discharge valve, a secondary discharge valve and a tertiary discharge valve.

[0009] Further preferably, the implementation process of the regeneration process specifically includes the following steps:

[0010] S1: The inorganic ceramic membrane filter is shut down;

[0011] S2: first industrial primary water cleaning;

[0012] S3: pickling;

[0013] S4: Second industrial primary water cleaning.

[0014] As a preferred embodiment of the present invention: the specific operation of shutting down the inorganic ceramic membrane filter includes the following steps:

[0015] S11: Keep the pipelines between the inorganic ceramic membrane filter and the recoil tank and the salt tank connected, and close the remaining valves;

[0016] S12: Turn on the compressed air to control the pressure to ≤0.3MPa to blow out the residual brine in the filter and discharge it all into the salt treatment tank.

[0017] As further preferred embodiment of the present invention: the specific operation of the first industrial water cleaning comprises the following steps:

[0018] S21: Open the main water inlet valve to let water flow into the membrane filter. The valve opening should not be too large and the water inlet pressure should be controlled to be ≤0.2MPa;

[0019] S22: Close the secondary discharge valve and the tertiary discharge valve 3 minutes after water inflow;

[0020] S23: Close the first-stage discharge valve to fill the inorganic ceramic membrane filter with water, control the inorganic ceramic membrane pressure ≤ 0.3MPa, open the first-stage permeation valve, the second-stage permeation valve, and the third-stage permeation valve, and wash the permeation side with water; after washing with water for 7 minutes, close the main water inlet valve; take a sample in the middle of the permeation side, and measure the pH value of 7-9 to be qualified, otherwise continue washing with water until the pH value is qualified;

[0021] S24: Open the first-stage discharge valve, the second-stage discharge valve, and the third-stage discharge valve to drain all the primary water in the membrane, and then close two of the first-stage discharge valve, the second-stage discharge valve, and the third-stage discharge valve;

[0022] S25: Close the first-stage permeation valve, the second-stage permeation valve, the third-stage permeation valve, close the return salt pool valve, and open the return hydrochloric acid tank valve.

[0023] As a further solution of the present invention: the specific operation of pickling comprises the following steps:

[0024] S31: Open the acid discharge valve of the inorganic ceramic membrane filter by 1 / 3, fully open the acid inlet valve, and fully open the hydrochloric acid return tank valve;

[0025] S32: Wear protective equipment, start the acid pump, slowly open the valve on one side of the acid pump to let acid into the membrane, and slowly open the valve 1 / 3;

[0026] S33: The acid discharge valves of the two inorganic ceramic membrane filters far away from the acid pump are closed 3 minutes after the acid is introduced;

[0027] S34: Close the acid discharge valve of the inorganic ceramic membrane near the acid pump to allow the membrane to be completely filled with hydrochloric acid, control the pressure on the membrane to 0.15-0.2MPa, and start washing the permeate side after 60 minutes of circulating acid washing;

[0028] S35: Open the first-level permeation valve, the second-level permeation valve, and the third-level permeation valve of the membrane, and close them after pickling for 30 minutes;

[0029] S36: After closing the first-stage permeation valve, the second-stage permeation valve, and the third-stage permeation valve, the membrane is acid-washed for 30 minutes, and then the acid pump is stopped, the valve body controlling the acid pump is closed, and the acid inlet valve is closed;

[0030] S37: Fully open the two acid discharge valves of the inorganic ceramic membrane, fully open all the first-stage permeation valves, second-stage permeation valves, and third-stage permeation valves, and discharge all the hydrochloric acid in the membrane and on the membrane permeation side to the hydrochloric acid recovery tank, then close the two acid discharge valves, close the hydrochloric acid return tank valve, and open the compressed air to control the pressure to ≤0.3MPa to blow away the hydrochloric acid.

[0031] Based on the above scheme: the specific operation of the second industrial primary water cleaning includes the following steps:

[0032] S41: Open the first-stage discharge valve, the second-stage discharge valve, and two of the third-stage discharge valves, open the main water inlet valve, and let water flow into the membrane filter. The valve opening should not exceed one-half, and the water inlet pressure should be controlled to be ≤0.2MPa;

[0033] S42: After 3 minutes of water inflow, close the secondary discharge valve and the tertiary discharge valve;

[0034] S43: Close the first-stage discharge valve to fill the inorganic ceramic membrane filter with water, control the inorganic ceramic membrane pressure ≤ 0.3MPa, open the first-stage permeation valve, the second-stage permeation valve, and the third-stage permeation valve, and wash the permeation side with water; after washing with water for 7 minutes, close the main water inlet valve; take a sample in the middle of the permeation side, and measure the pH value of 7-9 to be qualified, otherwise continue washing with water until the pH value is qualified;

[0035] S44: Open the first-stage discharge valve, the second-stage discharge valve, and the third-stage discharge valve to drain all the primary water in the membrane, and then close two of the first-stage discharge valve, the second-stage discharge valve, and the third-stage discharge valve;

[0036] S45: After regeneration and cleaning, the inorganic ceramic membrane can be put into use.

[0037] Based on the above scheme, it is preferred that: during the pickling process, the hydrochloric acid used for pickling the inorganic ceramic membrane must be high-purity hydrochloric acid to prevent free chlorine in the acid, and 1 kg of sodium sulfite is added to the hydrochloric acid tank before pickling; the hydrochloric acid concentration is detected and controlled between 16% and 22%; and the hydrochloric acid tank liquid level is confirmed to be ≥85%.

[0038] The beneficial effects of the present invention are:

[0039] 1. The present invention can make the inorganic ceramic membrane recyclable, prolong its service life and use cycle, and can extend its use by 1-2 years even in the worst salt quality conditions. The effect is obvious, and the operation is convenient and reliable.

[0040] 2. The present invention can fully and comprehensively treat the inorganic ceramic membrane filter through the processes of first industrial primary water cleaning, acid cleaning and second industrial primary water cleaning to increase the service life.

[0041] 3. The present invention uses a recoil mechanism, and in the processes of the first industrial primary water cleaning, pickling and the second industrial primary water cleaning, the water or hydrochloric acid is blown away by compressed air, which can enhance the treatment effect and improve the reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a structural flow chart of the regeneration process for extending the service life of the brine refining ceramic membrane system proposed by the present invention.

[0043] In the figure: 1 filter housing, 2 inorganic ceramic membrane, 3 permeation side drainage pipe, 4 secondary permeation valve, 5 permeation side housing, 6 permeation side, 7 primary discharge pipe, 8 secondary discharge pipe, 9 tertiary discharge pipe, 10 tertiary permeation valve, 11 regulating valve, 12 circulation pipe, 13 circulation pump, 14 primary discharge valve, 15 secondary discharge valve, 16 tertiary discharge valve, 17 water inlet pipe, 18 water inlet main valve, 19 sealing cover, 20 air compressor, 21 pressure gauge, 22 brine inlet valve, 23 primary shut-off valve, 24 hydrochloric acid recovery tank, 25 primary manual valve, 26 hydrochloric acid discharge pipe, 27 secondary shut-off valve, 28 hydrochloric acid discharge valve, 29 observation window, 30 secondary manual valve, 31 tertiary shut-off valve, 32 tertiary manual valve, 33 return salt pool valve, 34 return hydrochloric acid tank valve, 35 acid inlet valve, 36 primary permeation valve. DETAILED DESCRIPTION

[0044] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0045] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0046] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0047] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0048] Embodiment 1:

[0049] Regeneration process to extend the service life of ceramic membrane systems for brine refining, such as Figure 1As shown, it includes three inorganic ceramic membrane filters, a salt tank, a recoil mechanism and a hydrochloric acid recovery box 24, the inorganic ceramic membrane filter includes a filter housing 1, an inorganic ceramic membrane 2, a permeation side housing 5 is arranged in the filter housing 1, the inorganic ceramic membrane 2 is located in the permeation side housing 5, and a permeation side 6 is formed between the inorganic ceramic membrane 2 and the permeation side housing 5, the filter housing 1 is provided with a sealing cover 19 at the top and bottom, the three inorganic ceramic membrane filters are respectively connected to a series structure through series pipes, and the input end of the inorganic ceramic membrane filter at one end is connected to a water inlet pipe 17, and the inorganic ceramic membrane filter at the other end is connected to a water inlet pipe 17. The output end of the organic ceramic membrane filter is connected to a drain pipe, and a water inlet main valve 18 and a drain main valve are respectively provided on the water inlet pipe 17 and the drain pipe; a permeate side drain pipe 3 is provided on one side of the three inorganic ceramic membrane filters, and a permeate clear liquid port and a permeate emptying port are provided on the three inorganic ceramic membrane filters, and the permeate clear liquid port is connected to the recoil mechanism, and the permeate side drain pipe 3 is provided with three input ends and two output ends, and the three input ends of the permeate side drain pipe 3 are respectively connected to the permeate emptying ports of the three inorganic ceramic membrane filters, and the three input ends of the permeate side drain pipe 3 are respectively provided with a primary permeate valve 36, a secondary permeate valve 37, and a secondary permeate valve 38. The permeation valve 4 and the three-stage permeation valve 10, one output end of the permeation side drainage pipe 3 is connected to the input end of the hydrochloric acid recovery tank 24, and the other output end of the permeation side drainage pipe 3 is connected to the salt pool. The two output ends of the permeation side drainage pipe 3 are respectively provided with a return hydrochloric acid tank valve 34 and a return salt pool valve 33. One end of the hydrochloric acid recovery tank 24 is installed with a hydrochloric acid discharge pipe 26 with a hydrochloric acid discharge valve 28. One end of the hydrochloric acid discharge pipe 26 is connected to the drain pipe. The drain pipe is provided with two output ports, and one of the output ports of the drain pipe is introduced into the salt pool; the salt pool is provided with a circulation pipe 12, and the circulation pipe 12 One end is connected to the water inlet pipe 17, and the circulation pipe 12 is also provided with a circulation pump 13, a brine inlet valve 22 and a pressure gauge 21; an acid inlet pipe is installed on the outer wall of one side of the hydrochloric acid recovery tank 24, an acid pump is arranged on the acid inlet pipe, the acid inlet pipe is connected with the water inlet pipe, and an acid inlet valve 35 is installed on the acid inlet pipe; while the inorganic ceramic membrane filter and the hydrochloric acid recovery tank 24 at the end transport brine to the salt tank through an output port of the drain pipe, the circulation pump 13 can extract the liquid in the salt tank, and then transport it back to the first inorganic ceramic membrane filter through the water inlet pipe 17 to achieve the purpose of circulation.

[0050] To facilitate recoil; Figure 1As shown, the recoil mechanism includes a recoil tank and an air compressor 20, the air compressor 20 is connected to the input end of the recoil tank through a pipeline, a recoil pipeline is installed at the output end of the recoil tank, the recoil pipeline is provided with three branches, the permeate clear liquid ports of the three inorganic ceramic membrane filters are respectively connected to the three branches through pipelines, and the three branches of the recoil pipeline are respectively provided with a primary shut-off valve 23, a secondary shut-off valve 27 and a tertiary shut-off valve 31, as well as a primary hand valve 25, a secondary hand valve 30 and a tertiary hand valve 32; an observation window 29 is also provided on the three branches of the recoil pipeline; the recoil pipeline is provided with two output ends, one of which is connected to the recoil tank, and a regulating valve 11 is provided on the other output end of the recoil pipeline.

[0051] In order to facilitate discharge; Figure 1 As shown, the water inlet pipe 17 and the series pipe are respectively provided with a primary discharge pipe 7, a secondary discharge pipe 8 and a tertiary discharge pipe 9 at the input end near the three inorganic ceramic membrane filters, and the primary discharge pipe 7, the secondary discharge pipe 8 and the tertiary discharge pipe 9 are respectively provided with a primary discharge valve 14, a secondary discharge valve 15 and a tertiary discharge valve 16.

[0052] The implementation process of the regeneration process specifically includes the following steps:

[0053] S1: The inorganic ceramic membrane filter is shut down;

[0054] S2: first industrial primary water cleaning;

[0055] S3: pickling;

[0056] S4: Second industrial primary water cleaning.

[0057] The specific operation of shutting down the inorganic ceramic membrane filter includes the following steps:

[0058] S11: Keep the pipelines between the inorganic ceramic membrane filter and the recoil tank and the salt tank connected, and close the remaining valves;

[0059] S12: Turn on the compressed air to control the pressure to ≤0.3MPa to blow out the residual brine in the filter and discharge it all into the salt treatment tank.

[0060] The specific operation of the first industrial water cleaning comprises the following steps:

[0061] S21: Open the main water inlet valve 18 to let water flow into the membrane filter. The valve opening should not be too large and the water inlet pressure should be controlled to be ≤0.2MPa;

[0062] S22: After 3 minutes of water inflow, the secondary discharge valve 15 and the tertiary discharge valve 16 are closed;

[0063] S23: close the primary discharge valve 14, fill the inorganic ceramic membrane filter with water, control the inorganic ceramic membrane pressure ≤ 0.3 MPa, open the primary permeation valve 36, the secondary permeation valve 4, and the tertiary permeation valve 10, and wash the permeation side 6 with water; after washing for 7 minutes, close the main water inlet valve 18; take a sample in the middle of the permeation side 6, and measure the pH value of 7-9 to be qualified, otherwise continue washing until the pH value is qualified;

[0064] S24: Open the first-stage discharge valve 14, the second-stage discharge valve 15, and the third-stage discharge valve 16, and then close two of the first-stage discharge valve 14, the second-stage discharge valve 15, and the third-stage discharge valve 16 after all the primary water in the membrane is completely discharged;

[0065] S25: close the primary permeation valve 36, the secondary permeation valve 4, the tertiary permeation valve 10, close the return salt pool valve 33, and open the return hydrochloric acid tank valve 34.

[0066] Wherein, the specific operation of pickling comprises the following steps:

[0067] S31: Open the acid discharge valves of the inorganic ceramic membrane filter by 1 / 3, fully open the acid inlet valve 35, and fully open the hydrochloric acid return tank valve 34;

[0068] S32: Wear protective equipment, start the acid pump, slowly open the valve on one side of the acid pump to let acid into the membrane, and slowly open the valve 1 / 3;

[0069] S33: The acid discharge valves of the two inorganic ceramic membrane filters far away from the acid pump are closed 3 minutes after the acid is introduced;

[0070] S34: Close the acid discharge valve of the inorganic ceramic membrane near the acid pump to allow the membrane to be completely filled with hydrochloric acid, control the pressure on the membrane to 0.15-0.2MPa, and start washing the permeate side after 60 minutes of circulating acid washing;

[0071] S35: Open the membrane primary permeation valve 36, the secondary permeation valve 4, and the tertiary permeation valve 10, and close them after pickling for 30 minutes;

[0072] S36: After closing the primary permeation valve 36, the secondary permeation valve 4, and the tertiary permeation valve 10, the membrane is acid-washed for 30 minutes, the acid pump is stopped, the valve body of the acid pump is closed, and the acid inlet valve 35 is closed;

[0073] S37: Fully open the two acid discharge valves of the inorganic ceramic membrane, fully open all the first-stage permeation valves 36, the second-stage permeation valve 4, and the third-stage permeation valve 10, and discharge all the hydrochloric acid in the membrane and on the membrane permeation side 6 to the hydrochloric acid recovery tank 24, then close the two acid discharge valves, close the hydrochloric acid tank return valve 34, and open the compressed air to control the pressure ≤0.3MPa to blow away the hydrochloric acid.

[0074] Wherein, the specific operation of the second industrial primary water cleaning includes the following steps:

[0075] S41: Open two of the first-stage discharge valve 14, the second-stage discharge valve 15, and the third-stage discharge valve 16, and open the water inlet main valve 18 to allow water to flow into the membrane filter. The valve opening shall not exceed one-half, and the water inlet pressure shall be controlled to be ≤0.2MPa;

[0076] S42: After the water enters for 3 minutes, the secondary discharge valve 15 and the tertiary discharge valve 16 are closed;

[0077] S43: close the primary discharge valve 14, fill the inorganic ceramic membrane filter with water, control the inorganic ceramic membrane pressure ≤ 0.3 MPa, open the primary permeation valve 36, the secondary permeation valve 4, and the tertiary permeation valve 10, and wash the permeation side 6 with water; after washing for 7 minutes, close the main water inlet valve 18; take a sample in the middle of the permeation side 6, and measure the pH value of 7-9 to be qualified, otherwise continue washing until the pH value is qualified;

[0078] S44: Open the first-stage discharge valve 14, the second-stage discharge valve 15, and the third-stage discharge valve 16, and then close two of the first-stage discharge valve 14, the second-stage discharge valve 15, and the third-stage discharge valve 16 after all the primary water in the membrane is completely discharged;

[0079] S45: After regeneration and cleaning, the inorganic ceramic membrane can be put into use.

[0080] Among them, during the pickling process, the hydrochloric acid used for pickling the inorganic ceramic membrane must be high-purity hydrochloric acid to prevent free chlorine in the acid. Before pickling, 1 kg of sodium sulfite is added to the hydrochloric acid tank; the hydrochloric acid concentration is detected and controlled between 14% and 24%; and the hydrochloric acid tank liquid level is confirmed to be ≥85%.

[0081] Embodiment 2:

[0082] Regeneration process to extend the service life of ceramic membrane systems for brine refining, such as Figure 1 As shown, in order to improve the pickling effect, this embodiment makes the following improvements on the basis of Example 1: During the pickling process, the concentration of hydrochloric acid is further limited to 16% to 22%. After pickling, it is found that the pickling effect is better.

[0083] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A regeneration process for extending the service life of a brine refining ceramic membrane system, comprising three inorganic ceramic membrane filters, a salt tank, a backwash mechanism and a hydrochloric acid recovery tank (24), characterized in that: The inorganic ceramic membrane filter comprises a filter housing (1) and an inorganic ceramic membrane (2); a permeation side housing (5) is arranged in the filter housing (1); the inorganic ceramic membrane (2) is located in the permeation side housing (5); and a permeation side (6) is formed between the inorganic ceramic membrane (2) and the permeation side housing (5); a sealing cover (19) is installed on the top and bottom of the filter housing (1); three inorganic ceramic membrane filters are connected in series via series pipes to form a series structure; the input end of the inorganic ceramic membrane filter at one end is connected to a water inlet pipe (17); the output end of the inorganic ceramic membrane filter at the other end is connected to a drain pipe; a water inlet main valve (18) and a drain main valve (19) are respectively provided on the water inlet pipe (17) and the drain pipe. valve; a permeate side drainage pipe (3) is provided on one side of the three inorganic ceramic membrane filters; a permeate clear liquid port and a permeate emptying port are provided on the three inorganic ceramic membrane filters; the permeate clear liquid ports are connected to the recoil mechanism; the permeate side drainage pipe (3) is provided with three input ends and two output ends; the three input ends of the permeate side drainage pipe (3) are respectively connected to the permeate emptying ports of the three inorganic ceramic membrane filters; a primary permeate valve (36), a secondary permeate valve (4) and a tertiary permeate valve (10) are respectively provided on the three input ends of the permeate side drainage pipe (3); one output end of the permeate side drainage pipe (3) is connected to the input end of the hydrochloric acid recovery tank (24); the other output end of the permeate side drainage pipe (3) is connected to the chemical recovery tank (24); In the salt pool, two output ends of the permeate side drainage pipe (3) are respectively provided with a hydrochloric acid tank return valve (34) and a salt pool return valve (33); one end of the hydrochloric acid recovery box (24) is provided with a hydrochloric acid discharge pipe (26) with a hydrochloric acid discharge valve (28); one end of the hydrochloric acid discharge pipe (26) is connected to the drainage pipe, and the drainage pipe is provided with two output ports, one of which is led into the salt pool; a circulation pipe (12) is provided in the salt pool, one end of the circulation pipe (12) is connected to the water inlet pipe (17), and the circulation pipe (12) is also provided with a circulation pump (13), a salt water inlet valve (22) and a pressure gauge (21); an acid inlet pipe is provided on the outer wall of one side of the hydrochloric acid recovery box (24), and the acid inlet pipe is provided with a pressure gauge (21). An acid pump is provided, an acid inlet pipe is communicated with a water inlet pipe, and an acid inlet valve (35) is installed on the acid inlet pipe. The recoil mechanism comprises a recoil tank and an air compressor (20), the air compressor (20) is connected to the input end of the recoil tank through a pipeline, a recoil pipeline is installed at the output end of the recoil tank, the recoil pipeline is provided with three branches, the permeate clear liquid ports of three inorganic ceramic membrane filters are respectively connected to the three branches through pipelines, and the three branches of the recoil pipeline are respectively provided with a first-stage shut-off valve (23), a second-stage shut-off valve (27) and a third-stage shut-off valve (31), as well as a first-stage hand valve (25), a second-stage hand valve (30) and a third-stage hand valve (32); the three branches of the recoil pipeline are also provided with observation windows (29);The recoil pipeline is provided with two output ends, one of which is connected to the recoil tank, and the other output end of the recoil pipeline is provided with a regulating valve (11); the water inlet pipe (17) and the series pipeline are respectively provided with a primary discharge pipe (7), a secondary discharge pipe (8) and a tertiary discharge pipe (9) at the input end close to the three inorganic ceramic membrane filters; the primary discharge pipe (7), the secondary discharge pipe (8) and the tertiary discharge pipe (9) are respectively provided with a primary discharge valve (14), a secondary discharge valve (15) and a tertiary discharge valve (16); The implementation process of the regeneration process specifically includes the following steps: S1: The inorganic ceramic membrane filter is shut down; S2: first industrial primary water cleaning; S3: pickling; S4: Second industrial primary water cleaning; The specific operation of shutting down the inorganic ceramic membrane filter includes the following steps: S11: Keep the pipelines between the inorganic ceramic membrane filter and the recoil tank and the salt tank connected, and close the remaining valves; S12: Open the compressed air and control the pressure to ≤0.3MPa to blow away the residual brine in the filter and discharge it all into the salt tank; The specific operation of the first industrial water cleaning comprises the following steps: S21: Open the main water inlet valve (18) to allow water to flow into the membrane filter. The valve opening should not be too large and the water inlet pressure should be controlled to be ≤0.2MPa. S22: After the water enters for 3 minutes, the secondary discharge valve (15) and the tertiary discharge valve (16) are closed; S23: close the first-stage discharge valve (14) to allow the inorganic ceramic membrane filter to be completely filled with water, control the inorganic ceramic membrane pressure to ≤0.3 MPa, open the first-stage permeation valve (36), the second-stage permeation valve (4), and the third-stage permeation valve (10), and wash the permeation side (6) with water; after washing with water for 7 minutes, close the main water inlet valve (18); take a sample in the middle of the permeation side (6), and measure the pH value to be 7-9, otherwise continue washing with water until the pH value is qualified; S24: opening the first-stage discharge valve (14), the second-stage discharge valve (15), and the third-stage discharge valve (16) to completely discharge the primary water in the membrane, and then closing two of the first-stage discharge valve (14), the second-stage discharge valve (15), and the third-stage discharge valve (16); S25: close the primary permeation valve (36), the secondary permeation valve (4), the tertiary permeation valve (10), close the return salt pool valve (33), and open the return hydrochloric acid tank valve (34); The pickling specific operation comprises the following steps: S31: Open the acid discharge valves of the inorganic ceramic membrane filter by 1 / 3, fully open the acid inlet valve (35), and fully open the hydrochloric acid return tank valve (34); S32: Wear protective equipment, start the acid pump, slowly open the valve on one side of the acid pump to let acid into the membrane, and slowly open the valve 1 / 3; S33: The acid discharge valves of the two inorganic ceramic membrane filters far away from the acid pump are closed 3 minutes after the acid is introduced; S34: Close the acid discharge valve of the inorganic ceramic membrane near the acid pump to allow the membrane to be completely filled with hydrochloric acid, control the pressure on the membrane to 0.15-0.2MPa, and start washing the permeate side after 60 minutes of circulating acid washing (6); S35: Open the first-level permeation valve (36), the second-level permeation valve (4), and the third-level permeation valve (10) of the membrane, and close them after acid washing for 30 minutes; S36: After closing the primary permeation valve (36), the secondary permeation valve (4), and the tertiary permeation valve (10), the membrane is acid-washed for 30 minutes, the acid pump is stopped, the valve body for controlling the acid pump is closed, and the acid inlet valve (35) is closed; S37: Fully open the two acid discharge valves of the inorganic ceramic membrane, fully open all the primary permeation valves (36), secondary permeation valves (4), and tertiary permeation valves (10), and discharge all the hydrochloric acid in the membrane and on the membrane permeation side (6) to the hydrochloric acid recovery tank (24), then close the two acid discharge valves, close the hydrochloric acid return tank valve (34), and open the compressed air to control the pressure to ≤0.3MPa to blow away the hydrochloric acid; The specific operation of the second industrial primary water cleaning comprises the following steps: S41: Open two of the first-stage discharge valve (14), the second-stage discharge valve (15), and the third-stage discharge valve (16), and open the water inlet main valve (18) to allow water to flow into the membrane filter. The valve opening must not exceed one-half, and the water inlet pressure is controlled to be ≤0.2 MPa; S42: After the water enters for 3 minutes, the secondary discharge valve (15) and the tertiary discharge valve (16) are closed; S43: close the first-stage discharge valve (14) to allow the inorganic ceramic membrane filter to be completely filled with water, control the inorganic ceramic membrane pressure to be ≤0.3 MPa, open the first-stage permeation valve (36), the second-stage permeation valve (4), and the third-stage permeation valve (10), and wash the permeation side (6) with water; after washing with water for 7 minutes, close the main water inlet valve (18); take a sample in the middle of the permeation side (6), and measure the pH value to be 7-9, otherwise continue washing with water until the pH value is qualified; S44: opening the first-stage discharge valve (14), the second-stage discharge valve (15), and the third-stage discharge valve (16) to completely discharge the primary water in the membrane, and then closing two of the first-stage discharge valve (14), the second-stage discharge valve (15), and the third-stage discharge valve (16); S45: After regeneration and cleaning, the inorganic ceramic membrane can be put into use.

2. The regeneration process for extending the service life of the brine refining ceramic membrane system according to claim 1, characterized in that: During the pickling process, the hydrochloric acid used for pickling the inorganic ceramic membrane is high-purity hydrochloric acid to prevent free chlorine in the acid. Before pickling, 1 kg of sodium sulfite is added to the hydrochloric acid tank; the hydrochloric acid concentration is tested and controlled between 16% and 22%; and it is confirmed that the hydrochloric acid tank liquid level is ≥85%.

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