Reverse osmosis off-line cleaning device

Abstract

The utility model relates to a reverse osmosis off-line cleaning device and belongs to the technical field of environmental protection and water treatment. Comprising a cleaning water tank, a cleaning water tank blow-down valve, a floor drain, a cleaning water tank outlet valve, a cleaning water pump inlet reducer, a cleaning water pump, a cleaning water pump outlet valve, a cleaning water pump outlet pressure gauge, a cleaning water sampling valve, a cleaning water pump circulating valve, a security filter inlet valve, a security filter inlet reducer, a security filter and a security filter outlet reducer. The system comprises a cartridge filter, a cartridge filter outlet pressure gauge, a cartridge filter outlet valve, a cleaning group, a cleaning fluid sampling valve, a cleaning fluid reflux valve, a cleaning fluid discharge valve and a cleaning fluid trench. The reverse osmosis off-line cleaning device is compact in arrangement, capable of improving working efficiency, convenient to operate and capable of observing the flow of a membrane, pollutants in the membrane can be brought into cleaning liquid in the cleaning process, the flow liquid is increased accordingly, after the flow of a single piece is larger than 1 m < 3 > / h, cleaning is finished, and the original off-line cleaning is basically free of single piece flow detection design.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of reverse osmosis off-line cleaning device, belong to environmental protection and water treatment technical field. BACKGROUND

[0002] With the operation of reverse osmosis membrane, the water production flow of reverse osmosis membrane system is reduced, the water inlet pressure and the differential pressure of each section are increased, causing reverse osmosis pollution; The main reasons for forming this phenomenon are:

[0003] (1) insufficient pretreatment: raw water is not subjected to sufficient pretreatment, and these impurities will be intercepted by reverse osmosis membrane, accelerating the membrane fouling process;

[0004] (2) improper operation: excessive pressure adjustment, no timely cleaning and drying of membrane elements;

[0005] (3) improper system configuration and equipment selection: improper equipment selection or incorrect material selection may also produce impurities due to corrosion, wear and tear, etc.

[0006] (4) biological contamination: bacteria, algae, fungi and other microorganisms reproduce on the surface of reverse osmosis membrane, forming a biofilm that blocks the membrane pores and reduces water flux;

[0007] (5) concentration polarization: in reverse osmosis desalination systems, the selective permeability of the membrane allows water molecules to continuously permeate from the high-pressure side, while solute molecules remain in the original solution, resulting in a concentration difference between the feed solution on the membrane surface and the inlet feed solution, which may result in a very high concentration gradient when severe;

[0008] (6) inorganic salt scaling: CaCO3, CaSO4, BaSO4, SrSO4, CaF2 and SiO2, etc. The salts with small solubility product may precipitate due to concentration exceeding their solubility product during reverse osmosis process, resulting in deposits on the membrane surface or scale formation in the water inlet channel.

[0009] When reverse osmosis membrane fouling occurs and online chemical cleaning has no cleaning effect or the cleaning line is not thorough, offline cleaning of reverse osmosis membrane is required. The offline cleaning device is developed under this condition.

[0010] The existing off-line cleaning device is designed on the basis of the reverse osmosis device, the reverse osmosis device with 5-6 membrane shells is changed into one membrane shell, and six reverse osmosis membranes are installed side by side and cleaned simultaneously; the working principle is a double mechanism of chemical reaction and physical action; (1) chemical reaction: the reverse osmosis cleaning agent contains strong acid or weak acid components, and the minerals on the membrane surface are chemically reacted. Common minerals such as calcium carbonate and calcium sulfate are gradually dissolved into soluble ions or molecules, so that they are easily cleaned. For organic matter, oil and biological membrane pollutants, alkaline cleaning agent plays a dual role of decomposition and stripping. It can effectively decompose these organic matters, and at the same time, destroy the cell wall of microorganisms, so that the pollutants are completely stripped from the membrane surface. (2) Physical action: one is penetration: the cleaning agent can uniformly cover the membrane surface and separate the pollutants from the membrane surface through penetration; two is wetting and dispersion: the cleaning agent can uniformly cover the membrane surface through wetting and dispersion, fully contact with the pollutants, loosen and remove the pollutants from the membrane surface, and ensure the thoroughness of cleaning. (3) pH value adjustment: during the cleaning process, the cleaning agent adjusts the pH value of the system to create an environment that is not conducive to the deposition of pollutants; it helps to effectively prevent the membrane from being polluted again after cleaning; for different types of pollutants on the reverse osmosis membrane, the chemical composition of the carefully prepared cleaning agent achieves targeted cleaning effect.

[0011] However, the existing cleaning device has the following disadvantages: 1. The off-line cleaning device has a small number of membrane shells, and as the application scenarios of reverse osmosis membranes increase, the water quality becomes more complex, causing serious membrane pollution and frequent requirements for the number of off-line devices to be cleaned simultaneously. The existing one generally cleans six at the same time, which cannot meet the growing market demand; 2. The flow of the membrane cannot be observed during the cleaning process; 3. The equipment arrangement is unreasonable, the space occupied is large, and it is not convenient to arrange and operate.

[0012] Therefore, to provide a reverse osmosis off-line cleaning device, the equipment arrangement is compact, the space occupied is small, and it can meet the simultaneous cleaning of 12 reverse osmosis membranes, and the cleaning flow and corresponding pressure of each reverse osmosis membrane can be observed, which has become a technical problem urgently to be solved in the technical field. SUMMARY

[0013] The utility model discloses a reverse osmosis off-line cleaning device, the equipment arrangement is compact, and the space occupied is small, and the design can meet the simultaneous cleaning of 12 reverse osmosis membranes, save time and effort, and the cleaning flow and pressure of each reverse osmosis membrane can be observed, and the design is two-sided operation, and the front side and the left side are placed against the wall, saving space, and three membrane flows can be detected simultaneously, and through valve switching, the flux of each membrane can be observed simultaneously without disassembling the membrane.

[0014] To achieve the above-mentioned purpose, the technical scheme provided by the utility model is:

[0015] An offline cleaning device for reverse osmosis, characterized in that it comprises a cleaning water tank, a cleaning water tank drain valve, a floor drain, a cleaning water tank outlet valve, a cleaning water pump inlet reducer, a cleaning water pump, a cleaning water pump outlet valve, a cleaning water pump outlet pressure gauge, a cleaning water sampling valve, a cleaning water pump circulation valve, a security filter inlet valve, a security filter inlet reducer, a security filter, a security filter outlet reducer, a security filter outlet pressure gauge, a security filter outlet valve, a cleaning group, a cleaning liquid sampling valve, a cleaning liquid return valve, a cleaning liquid discharge valve, and a cleaning liquid floor drain; one side of the cleaning water tank is provided with a cleaning water tank drain valve and is connected to the floor drain, the other side of the cleaning water tank is provided with a cleaning water tank outlet valve and is connected to the inlet end of the cleaning water pump through the cleaning water pump inlet reducer, the outlet end of the cleaning water pump is provided with a cleaning water pump outlet valve, the cleaning pipeline is provided with a cleaning water pump outlet pressure gauge and a cleaning water sampling valve, which is connected to the upper part of the cleaning water tank on one side to form a circulation, and is provided with a cleaning water pump circulation valve on the pipeline, and is connected to the inlet end of the security filter on the other side through the security filter inlet valve and the security filter inlet reducer, the outlet end of the security filter is connected to the security filter outlet pressure gauge through the security filter outlet reducer, the security filter outlet pressure gauge is connected to the security filter outlet valve, the security filter outlet valve is connected to the cleaning group, one end of the cleaning group is connected to the cleaning liquid sampling valve through the cleaning liquid return valve, and the other end is connected to the cleaning liquid floor drain through the cleaning liquid discharge valve.

[0016] Preferably, the cleaning group comprises three parallel cleaning groups: a first cleaning group, a second cleaning group, and a third cleaning group.

[0017] Preferably, the first cleaning group comprises four parallel first membrane shells, the left side of the first membrane shell is provided with a valve, and the valve is connected to the security filter outlet valve through the left side valve, the right side of the first membrane shell is provided with a right side valve, and the four right side valves are connected to the cleaning liquid sampling valve through the first flow meter at one end and to the cleaning liquid floor drain through the cleaning liquid discharge valve at the other end.

[0018] Preferably, the first membrane shell has a cylindrical hollow structure and is made of glass fiber reinforced plastic, both ends of which are sealed by end plates, and the inside contains a volume of reverse osmosis membranes, the size of the 8040 reverse osmosis membrane is 8 inches (about 20.32 cm) in diameter and 40 inches (about 101.6 cm) in length, and the membrane shell can withstand a pressure of 300 psi (2.067 MPa).

[0019] Preferably, the second cleaning group comprises four second membrane housings connected in parallel, the left side of the second membrane housings is provided with a valve and connected with the security filter outlet valve through the left side valve, the right side of the second membrane housings is provided with a right side valve, the four right side valves are connected with the cleaning liquid sampling valve through the first flow meter at one end and connected with the cleaning liquid drain through the cleaning liquid discharge valve at the other end.

[0020] Preferably, the third cleaning group comprises four third membrane housings connected in parallel, the left side of the third membrane housings is provided with a valve and connected with the security filter outlet valve through the left side valve, the right side of the third membrane housings is provided with a right side valve, the four right side valves are connected with the cleaning liquid sampling valve through the first flow meter at one end and connected with the cleaning liquid drain through the cleaning liquid discharge valve at the other end.

[0021] Beneficial effects:

[0022] The reverse osmosis offline cleaning device is compact in arrangement, occupies less land and is convenient to operate; the flow of single membrane can be observed, and in the cleaning process, the pollutants in the membrane are brought into the cleaning liquid, and the flow liquid is increased accordingly; when the flow of single membrane is greater than 1 m 3 / h, the cleaning is finished, and the original offline cleaning basically has no single flow detection design.

[0023] 1) The design is two-sided operation, the equipment is compact in arrangement, and space is saved;

[0024] 2) The design can meet the simultaneous cleaning of 12 reverse osmosis membranes, and time and labor are saved;

[0025] 3) The flow and pressure of each reverse osmosis membrane in the cleaning process can be observed;

[0026] 4) Three membrane flows can be detected simultaneously, and the flow of each membrane can be observed simultaneously through valve switching without disassembling the membrane.

[0027] The utility model is further described below through the drawings and specific embodiments, but does not mean the limitation on the protection scope of the utility model. DRAWINGS

[0028] Figure 1 It is the structure schematic diagram of reverse osmosis offline cleaning device of embodiment 1 of the utility model

[0029] MAIN DRAWING MARK EXPLANATION:

[0030] 1 cleaning water tank 2 cleaning water tank drain valve

[0031] 3 floor drain 4 cleaning water tank outlet valve

[0032] 5 cleaning water pump inlet variable diameter 6 cleaning water pump

[0033] 7. Clean the water pump outlet valve 8. Clean the water pump outlet pressure gauge

[0034] 9 Cleaning water sampling valve 10 Cleaning water pump circulation valve

[0035] 11 Safety filter inlet valve 12 Safety filter inlet reducer

[0036] 13 Security filter 14 Security filter outlet reducer

[0037] 15 Safety filter outlet pressure gauge 16 Safety filter outlet valve

[0038] 17 first membrane shell 18 second membrane shell

[0039] 19 third membrane housing 20 cleaning liquid sampling valve

[0040] 21 cleaning fluid reflux valve 22 cleaning fluid discharge valve

[0041] 23 cleaning fluid trench DETAILED DESCRIPTION

[0042] Unless otherwise specified, in the embodiments of the present invention, the components used are conventional components available on the market in this technical field, the connections between the components are conventional connections, and the units mentioned are weight units.

[0043] Example 1

[0044] like Figure 1 The figure shows the structure of the reverse osmosis offline cleaning device of Example 1 of the present invention; wherein 1 is a cleaning water tank for preparing and storing cleaning liquid; 2 is a cleaning water tank drain valve for discharging the dirty liquid after cleaning; 3 is a floor drain for discharging chemical wastewater; 4 is a cleaning water tank outlet valve, 5 is a cleaning water pump inlet reducer, 6 is a cleaning water pump for circulating the cleaning liquid; 7 is a cleaning water pump outlet valve, 8 is a cleaning water pump outlet pressure gauge for observing the water flow pressure; 9 is a cleaning water sampling valve for measuring the pH change of the inlet water quality; 10 is a cleaning water circulation valve, and 11 is a safety filter inlet valve. , 12 is the inlet reducer of the security filter, 13 is the security filter, used to remove impurities in the water and protect the reverse osmosis membrane; 14 is the outlet reducer of the security filter, 15 is the outlet pressure gauge of the security filter, used to observe the water inlet pressure of the reverse osmosis membrane; 16 is the outlet valve of the security filter, 17 is the first membrane shell, used to install the cleaned reverse osmosis membrane; 18 is the second membrane shell, 19 is the third membrane shell, 20 is the cleaning liquid sampling valve, used to measure the pH change of the effluent water quality; 21 is the cleaning liquid reflux valve, 22 is the cleaning liquid discharge valve, used to discharge the dirty liquid after cleaning; 23 is the cleaning liquid ditch, used for the discharge of chemical sewage;

[0045] The utility model discloses a reverse osmosis off -line cleaning device, including cleaning water tank 1, cleaning water tank blowdown valve 2, floor drain 3, cleaning water tank export valve 4, cleaning water pump inlet variable diameter 5, cleaning water pump 6, cleaning water pump export valve 7, cleaning water pump export pressure gauge 8, cleaning water sampling valve 9, cleaning water pump circulation valve 10, security filter inlet valve 11, security filter inlet variable diameter 12, security filter 13, security filter outlet variable diameter 14, security filter export pressure gauge 15, security filter export valve 16, first membrane shell 17, second membrane shell 18, third membrane shell 19, cleaning fluid sampling valve 20, cleaning fluid backflow valve 21, cleaning fluid discharge valve 22, cleaning fluid trench 23, one side of cleaning water tank 1 is equipped with cleaning water tank blowdown valve 2 and is connected with floor drain 3, and the other side of cleaning water tank 1 is equipped with cleaning water tank export valve 4, and is connected with the import end of cleaning water pump 6 through cleaning water pump inlet variable diameter 5, and the export end of cleaning water pump 6 is equipped with cleaning water pump export valve 7, and cleaning pipeline is equipped with cleaning water pump export pressure gauge 8 and cleaning water sampling valve 9, is connected with the upper portion of cleaning water tank 1 through pipeline on one hand, forms circulation, is equipped with cleaning water pump circulation valve 10 on the pipeline, is connected with the import end of security filter 13 through security filter inlet valve 11 and security filter inlet variable diameter 12 on the other hand, and the export end of security filter 13 is connected with security filter export pressure gauge 15 through security filter outlet variable diameter 14, and security filter export pressure gauge 15 is connected with security filter export valve 16, and security filter export valve 16 is connected in parallel with first cleaning group, second cleaning group, third cleaning group respectively, and first cleaning group includes four parallel first membrane shell 17, and the left side of first membrane shell 17 is equipped with valve, and is connected with security filter export valve 16 through the left side valve, and the right side of first membrane shell 17 is equipped with right side valve, and four groups of right side valves are connected through first flowmeter, and one end is connected with cleaning fluid sampling valve 20 through cleaning fluid backflow valve 21, and the other end is connected with cleaning fluid trench 23 through cleaning fluid discharge valve 22, and the structure of first membrane shell 17 is cylindrical empty core structure, and the material is glass steel, and both ends are sealed by end plate, and the inside just contains the volume of a reverse osmosis membrane, and the size of 8040 reverse osmosis membrane is: diameter 8 inches (about 20.32cm) length 40 inches (about 101.6 centimeters), and the pressure resistance of membrane shell is 300psi (2.067The second cleaning group comprises four second membrane housings 18 connected in parallel, the left side of the second membrane housing 18 is provided with a valve and is connected with the security filter outlet valve 16 through the left side valve, the right side of the second membrane housing 18 is provided with a right side valve, and the four right side valves are connected with the cleaning liquid sampling valve 20 through the first flow meter at one end and are connected with the cleaning liquid drain 23 through the cleaning liquid discharge valve 22 at the other end.

[0046] The material of the cleaning water tank 1 is PE, and the specification is φ1.5m*2; the specification of the cleaning water pump 6 is 30m 3 / h, the lift is 35m, the impeller material is SS316; the specification of the security filter 13 is φ300mm, and the material is glass fiber reinforced plastic; the specification of the cleaning water tank blowdown valve 2 is DN40, and the material is UPVC; the specification of the cleaning water tank outlet valve 4 is DN100, and the material is UPVC; the specification of the cleaning water pump inlet reducer 5, the security filter inlet reducer 12 and the security filter outlet reducer 14 is DN100*80, and the material is UPVC; the specification of the cleaning water pump outlet valve 7 and the security filter outlet valve 16 is DN80, and the material is UPVC; the specification of the cleaning water pump outlet pressure gauge 8 and the security filter outlet pressure gauge 15 is φ100mm, the material is ss304, and the manufacturer is Beijing Blythe Instrument and Meter Co., Ltd. (Blythe); the specification of the cleaning water sampling valve 9 and the cleaning liquid sampling valve 20 is DN15, and the material is UPVC; the specification of the cleaning water pump circulating valve 10 and the security filter inlet valve 11 is DN80, and the material is UPVC; the materials of the first membrane housing 17, the second membrane housing 18 and the third membrane housing 19 are glass fiber reinforced plastic; the specification of the cleaning liquid return valve 21 is DN40, and the material is UPVC; the specification of the cleaning liquid discharge valve 22 is DN50, and the material is UPVC.

[0047] The working principle of the reverse osmosis offline cleaning device is as follows:

[0048] Through the design of single membrane housing short process, large flux water can quickly take out the pollutants, the cleaning liquid is prepared according to the pollution type, and the pollutants in the reverse osmosis membrane are taken away through chemical reaction and physical process, so that the membrane is cleaned.

[0049] In the reverse osmosis offline cleaning device, when the membrane is cleaned, the membrane housing end plate is first disassembled, and the membrane to be cleaned is loaded into the membrane housing.

[0050] Before the membrane cleaning, the membrane contamination material needs to be predicted in advance, and the cleaning scheme is selected according to different contaminants; the cleaning water tank is configured with cleaning liquid, and after the cleaning liquid is configured, the internal circulation can be realized through the internal circulation valve of the cleaning water pump to the water tank, and after uniform circulation, the membrane shell is cleaned;

[0051] The cleaning device is designed with one group of every four membrane shells, one flow meter is arranged in each group, one membrane shell is opened in and out of water in each group, three groups are cleaned at the same time, and the other membranes are soaked; the flow meter can see the flow of each membrane; cleaning for 30 minutes, start soaking and switch other membrane cleaning, continuously cycle cleaning, cleaning for 30 minutes, soaking for 1.5 hours, 2 hours for one cycle;

[0052] According to the pollution degree, the cleaning time is determined, generally, the cleaning time is 1 day, and the water quantity of a single membrane shell is greater than 1m 3 / h.

[0053] The reverse osmosis offline cleaning device of the utility model installs 12 membrane shells, overcomes the problem of previous loose arrangement, is arranged compactly, occupies the equivalent of 6 membrane shells, cleans 12 at a time, and improves work efficiency; two sides can be operated, the other two sides are arranged against the wall, operation is convenient, and space is saved; every four filter cartridges are designed as a group, a flow meter is installed in each group, the flow of the membrane can be observed, the flow of the seriously contaminated membrane in the early stage of cleaning will be small, in the cleaning process, the contaminants in the membrane will be brought into the cleaning liquid, and the flow will increase accordingly; when the flow of a single membrane is greater than 1m 3 / h, the cleaning is finished, and the original offline cleaning basically does not have single flow detection design.

[0054] The above merely describes the preferred specific implementation mode of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can cover the protection scope of the utility model according to the technical scheme and the utility model concept of the utility model or equivalent replacement or change within the technical range disclosed by the utility model.

Claims

1. A reverse osmosis off-line cleaning apparatus, characterized by: The cleaning system comprises a cleaning water tank, a cleaning water tank blowdown valve, a floor drain, a cleaning water tank outlet valve, a cleaning water pump inlet reducer, a cleaning water pump, a cleaning water pump outlet valve, a cleaning water pump outlet pressure gauge, a cleaning water sampling valve, a cleaning water pump circulation valve, a security filter inlet valve, a security filter inlet reducer, a security filter, a security filter outlet reducer, a security filter outlet pressure gauge, a security filter outlet valve, a cleaning group, a cleaning liquid sampling valve, a cleaning liquid backflow valve, a cleaning liquid discharge valve and a cleaning liquid floor drain.

2. The reverse osmosis off-line cleaning apparatus of claim 1, wherein: One side of the cleaning water tank is provided with the cleaning water tank blowdown valve and connected with the floor drain, and the other side of the cleaning water tank is provided with the cleaning water tank outlet valve and connected with the inlet end of the cleaning water pump through the cleaning water pump inlet reducer.

3. The reverse osmosis off-line cleaning apparatus of claim 2, wherein: The cleaning group comprises three parallel cleaning groups, i.e., a first cleaning group, a second cleaning group and a third cleaning group.

4. The reverse osmosis off-line cleaning apparatus of claim 3, wherein: The first cleaning group comprises four parallel first membrane shells.

5. The reverse osmosis off-line cleaning apparatus of claim 4, wherein: The first membrane shell is in a cylindrical hollow structure and made of glass fiber reinforced plastic, and both ends are sealed by end plates.

6. The reverse osmosis off-line cleaning apparatus of claim 5, wherein: The second cleaning group comprises four parallel second membrane shells.

7. The reverse osmosis off-line cleaning apparatus of claim 6, wherein: The second membrane shell is in a cylindrical hollow structure and made of glass fiber reinforced plastic, and both ends are sealed by end plates.

8. The reverse osmosis off-line cleaning apparatus of claim 7, wherein: The third cleaning group comprises four parallel third membrane shells. The third membrane shell is in a cylindrical hollow structure and made of glass fiber reinforced plastic, and both ends are sealed by end plates.

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