Short-process membrane desalination system

Abstract

The utility model discloses a short-flow membrane desalination system which comprises a pretreatment water production tank, a water outlet of the pretreatment water production tank is connected with a first-stage high-pressure pump, the first-stage high-pressure pump is connected with a reverse osmosis security filter, the reverse osmosis security filter is connected with a first-stage reverse osmosis device, the first-stage reverse osmosis device is connected with a second-stage high-pressure pump, and the second-stage high-pressure pump is connected with a second-stage reverse osmosis device. The output end of the second-stage high-pressure pump is connected with a second-stage reverse osmosis device, the second-stage reverse osmosis device is connected with an EDI lift pump, the EDI lift pump is connected with an EDI security filter, and the EDI security filter is connected with an EDI device. Compared with the conventional membrane desalination system, the membrane desalination system has the advantages that part of equipment and auxiliary pipeline valves and the like are reduced, equipment investment and occupied area are saved to the greatest extent, energy consumption and waste of water produced by the first-stage and second-stage reverse osmosis devices entering the water tank are saved due to shorter technological process, the energy consumption of the whole system is reduced, and the production cost is reduced. Therefore, the operation cost of the system is reduced.

Description

Technical Field

[0001] The utility model relates to a short-process membrane desalination system, belonging to the technical field of high-purity desalted water preparation. Background Art

[0002] High-purity water refers to water with extremely high chemical purity, with a conductivity of less than 0.1μs / cm (25℃) and an impurity content of less than 0.1mg / L. It is widely used in laboratories, electronics, electricity and other fields.

[0003] The main processes for producing high-purity water include distillation, ion exchange, and membrane separation. Membrane separation has become the mainstream technology for producing high-purity water in recent years due to its advantages such as low chemical consumption, small footprint, and stable operation. This patent, based on membrane separation technology, proposes a short-process membrane desalination system that has the advantages of a shorter process, lower energy consumption, and less investment than the current typical full-membrane process. Utility Model Content

[0004] The purpose of the utility model is to provide a short-process membrane desalination system with high purification accuracy and the advantages of short process, low energy consumption and low investment.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a short-process membrane desalination system, including a pretreatment water tank, the treatment water tank is used to store pretreated water, the turbidity of the pretreated water is less than 1NTU, the silt density index SDI is less than 5, and the COD is less than 30mg / L, the outlet of the treatment water tank is connected to a first-level high-pressure pump through a pipeline, the output end of the first-level high-pressure pump is connected to a reverse osmosis security filter through a pipeline, the outlet of the reverse osmosis security filter is connected to a first-level reverse osmosis device through a pipeline, the outlet of the first-level reverse osmosis device is connected to a second-level high-pressure pump through a pipeline, the output end of the second-level high-pressure pump is connected to a second-level reverse osmosis device through a pipeline, the outlet of the second-level reverse osmosis device is connected to an EDI boost pump through a pipeline, the output end of the EDI boost pump is connected to the EDI security filter through a pipeline, the outlet of the EDI security filter is connected to the EDI device through a pipeline, and the outlet of the EDI device is connected to a desalted water tank through a pipeline.

[0006] In the aforementioned short-process membrane desalination system, the concentrated water outlets of the secondary reverse osmosis device and the EDI device are both connected to the pre-treated water production tank through pipelines.

[0007] In the aforementioned short-process membrane desalination system, the first-stage high-pressure pump, the second-stage high-pressure pump, and the EDI boost pump are all connected to a variable frequency controller for variable frequency control.

[0008] In the aforementioned short-flow membrane desalination system, the reverse osmosis security filter adopts a high-pressure resistant shell, and a folded large-flow filter element is used inside the security filter, and the filtration accuracy of the folded large-flow filter element is 5μm.

[0009] In the aforementioned short-flow membrane desalination system, the filtration accuracy of the filter element inside the EDI security filter is 1 μm.

[0010] In the aforementioned short-process membrane desalination system, a dosing device is provided on the connecting pipe between the first-stage high-pressure pump and the reverse osmosis safety filter, and the dosing device is used to add scale inhibitors and reducing agents.

[0011] In the aforementioned short-process membrane desalination system, the dosing device includes a reagent storage device, a dosing pump, and an analytical instrument. The reagent storage device is connected to the dosing pump, and the output end of the dosing pump is connected to the connecting pipe between the first-stage high-pressure pump and the reverse osmosis safety filter. The detection end of the analytical instrument is arranged in the connecting pipe between the first-stage high-pressure pump and the reverse osmosis safety filter, and the dosing amount is controlled by the dosing pump and the corresponding analytical instrument.

[0012] In the aforementioned short-process membrane desalination system, a pH regulating device is provided on the connecting pipe between the primary reverse osmosis device and the secondary high-pressure pump, and the pH regulating device can be adjusted by adding alkali.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] (1) The utility model reduces the low-pressure lifting pump in front of the first-stage reverse osmosis device, and places the safety filter between the high-pressure pump and the first-stage reverse osmosis device, thereby reducing the water tank, low-pressure lifting pump and safety filter between the first-stage reverse osmosis device and the second-stage reverse osmosis device, and reducing the water tank between the second-stage reverse osmosis device and the EDI device;

[0015] (2) The secondary reverse osmosis concentrated water and EDI concentrated water of the utility model are separately returned to the pre-treatment water tank to increase the system recovery rate;

[0016] (3) Compared with the current membrane desalination system, the present invention reduces some equipment and its associated pipeline valves, etc., thus saving equipment investment and floor space to the greatest extent. At the same time, due to the shorter process flow, the energy consumption and waste of the water produced by the first and second level reverse osmosis devices entering the water tank are saved, thereby reducing the energy consumption of the entire system and thus reducing the operating costs of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the system structure of the present utility model.

[0018] Figure numerals: 1- produced water tank, 2- first-stage high-pressure pump, 3- reverse osmosis safety filter, 4- first-stage reverse osmosis device, 5- second-stage high-pressure pump, 6- second-stage reverse osmosis device, 7-EDI lifting pump, 8-EDI safety filter, 9-EDI device, 10- desalted water tank, 11- dosing device, 12- drug storage device, 13- dosing pump, 14- analytical instrument, 15- ph adjustment device.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0020] Example 1 of the present invention: A short-process membrane desalination system includes a pre-treated water tank 1. A suitable pre-treatment process is selected according to the water quality of the high-purity desalted water, including disinfection, clarification, filtration, activated carbon adsorption and other technologies, so that the turbidity of the pre-treated water is less than 1NTU, the silt density index SDI is less than 5, and the COD is less than 30mg / L. The treated water tank 1 is used to store the pre-treated water;

[0021] The outlet of the treated water tank 1 is connected to a first-level high-pressure pump 2 through a pipeline, the output end of the first-level high-pressure pump 2 is connected to a reverse osmosis security filter 3 through a pipeline, the outlet of the reverse osmosis security filter 3 is connected to a first-level reverse osmosis device 4 through a pipeline, the outlet of the first-level reverse osmosis device 4 is connected to a second-level high-pressure pump 5 through a pipeline, the output end of the second-level high-pressure pump 5 is connected to a second-level reverse osmosis device 6 through a pipeline, the outlet of the second-level reverse osmosis device 6 is connected to an EDI boost pump 7 through a pipeline, the output end of the EDI boost pump 7 is connected to an EDI security filter 8 through a pipeline, the outlet of the EDI security filter 8 is connected to an EDI device 9 through a pipeline, and the outlet of the EDI device 9 is connected to a desalted water tank 10 through a pipeline.

[0022] Embodiment 2 of the present invention: A short-process membrane desalination system includes a pre-treated water tank 1. A suitable pre-treatment process is selected according to the water quality of the high-purity desalted water, including disinfection, clarification, filtration, activated carbon adsorption and other technologies, so that the turbidity of the pre-treated water is less than 1 NTU, the silt density index SDI is less than 5, and the COD is less than 30 mg / L. The treated water tank 1 is used to store the pre-treated water;

[0023] The outlet of the treated water tank 1 is connected to a first-level high-pressure pump 2 through a pipeline, the output end of the first-level high-pressure pump 2 is connected to a reverse osmosis security filter 3 through a pipeline, the outlet of the reverse osmosis security filter 3 is connected to a first-level reverse osmosis device 4 through a pipeline, the outlet of the first-level reverse osmosis device 4 is connected to a second-level high-pressure pump 5 through a pipeline, the output end of the second-level high-pressure pump 5 is connected to a second-level reverse osmosis device 6 through a pipeline, the outlet of the second-level reverse osmosis device 6 is connected to an EDI boost pump 7 through a pipeline, the output end of the EDI boost pump 7 is connected to an EDI security filter 8 through a pipeline, the outlet of the EDI security filter 8 is connected to an EDI device 9 through a pipeline, and the outlet of the EDI device 9 is connected to a desalted water tank 10 through a pipeline.

[0024] Among them, the concentrated water outlets of the secondary reverse osmosis device 6 and the EDI device 9 are connected to the pretreatment water tank 1 through pipes. The concentrated water of the primary reverse osmosis device 4 is discharged or reused to other water points due to its high salt content. The concentrated water of the secondary reverse osmosis device 6 is returned to the pretreatment water tank 1 through a pipe, and the concentrated water of the EDI is returned to the pretreatment water tank 1 through a pipe to increase the system recovery rate.

[0025] Embodiment 3 of the present invention: A short-process membrane desalination system includes a pre-treated water tank 1. A suitable pre-treatment process is selected according to the water quality of the high-purity desalted water, including disinfection, clarification, filtration, activated carbon adsorption and other technologies, so that the turbidity of the pre-treated water is less than 1 NTU, the silt density index SDI is less than 5, and the COD is less than 30 mg / L. The treated water tank 1 is used to store the pre-treated water;

[0026] The outlet of the treated water tank 1 is connected to a first-level high-pressure pump 2 through a pipeline, the output end of the first-level high-pressure pump 2 is connected to a reverse osmosis security filter 3 through a pipeline, the outlet of the reverse osmosis security filter 3 is connected to a first-level reverse osmosis device 4 through a pipeline, the outlet of the first-level reverse osmosis device 4 is connected to a second-level high-pressure pump 5 through a pipeline, the output end of the second-level high-pressure pump 5 is connected to a second-level reverse osmosis device 6 through a pipeline, the outlet of the second-level reverse osmosis device 6 is connected to an EDI boost pump 7 through a pipeline, the output end of the EDI boost pump 7 is connected to an EDI security filter 8 through a pipeline, the outlet of the EDI security filter 8 is connected to an EDI device 9 through a pipeline, and the outlet of the EDI device 9 is connected to a desalted water tank 10 through a pipeline.

[0027] The first-level high-pressure pump 2, the second-level high-pressure pump 5, and the EDI boost pump 7 are all connected to a frequency conversion controller, which can control the overall operation of the system. The system must be started strictly one level at a time from front to back, and shut down one level at a time from back to front, and the order cannot be disrupted; the first-level high-pressure pump 2, the second-level high-pressure pump 5, and the EDI boost pump 7 must be started at a low frequency, and the pressure must be boosted in conjunction with the water production flow.

[0028] Example 4 of the present utility model: A short-process membrane desalination system includes a pre-treated water tank 1. A suitable pre-treatment process is selected according to the water quality of the high-purity desalted water, including disinfection, clarification, filtration, activated carbon adsorption and other technologies, so that the turbidity of the pre-treated water is less than 1NTU, the silt density index SDI is less than 5, and the COD is less than 30mg / L. The treated water tank 1 is used to store the pre-treated water;

[0029] The outlet of the treated water tank 1 is connected to a first-level high-pressure pump 2 through a pipeline, the output end of the first-level high-pressure pump 2 is connected to a reverse osmosis security filter 3 through a pipeline, the outlet of the reverse osmosis security filter 3 is connected to a first-level reverse osmosis device 4 through a pipeline, the outlet of the first-level reverse osmosis device 4 is connected to a second-level high-pressure pump 5 through a pipeline, the output end of the second-level high-pressure pump 5 is connected to a second-level reverse osmosis device 6 through a pipeline, the outlet of the second-level reverse osmosis device 6 is connected to an EDI boost pump 7 through a pipeline, the output end of the EDI boost pump 7 is connected to an EDI security filter 8 through a pipeline, the outlet of the EDI security filter 8 is connected to an EDI device 9 through a pipeline, and the outlet of the EDI device 9 is connected to a desalted water tank 10 through a pipeline.

[0030] Among them, the reverse osmosis security filter 3 adopts a high-pressure resistant shell, so that the shell of the reverse osmosis security filter 3 can withstand the maximum pressure of the first-level high-pressure pump 2, and the interior of the security filter 3 adopts a folded large-flow filter element, and the folded large-flow filter element has a filtration accuracy of 5μm, and the filtration accuracy of the filter element inside the EDI security filter 8 is 1μm.

[0031] Embodiment 5 of the present invention: A short-process membrane desalination system includes a pre-treated water tank 1. A suitable pre-treatment process is selected according to the water quality of the high-purity desalted water, including disinfection, clarification, filtration, activated carbon adsorption and other technologies, so that the turbidity of the pre-treated water is less than 1 NTU, the silt density index SDI is less than 5, and the COD is less than 30 mg / L. The treated water tank 1 is used to store the pre-treated water;

[0032] The outlet of the treated water tank 1 is connected to a first-level high-pressure pump 2 through a pipeline, the output end of the first-level high-pressure pump 2 is connected to a reverse osmosis security filter 3 through a pipeline, the outlet of the reverse osmosis security filter 3 is connected to a first-level reverse osmosis device 4 through a pipeline, the outlet of the first-level reverse osmosis device 4 is connected to a second-level high-pressure pump 5 through a pipeline, the output end of the second-level high-pressure pump 5 is connected to a second-level reverse osmosis device 6 through a pipeline, the outlet of the second-level reverse osmosis device 6 is connected to an EDI boost pump 7 through a pipeline, the output end of the EDI boost pump 7 is connected to an EDI security filter 8 through a pipeline, the outlet of the EDI security filter 8 is connected to an EDI device 9 through a pipeline, and the outlet of the EDI device 9 is connected to a desalted water tank 10 through a pipeline.

[0033] A dosing device 11 is provided on the connecting pipe between the first-level high-pressure pump 2 and the reverse osmosis security filter 3. The dosing device 11 adds scale inhibitor and reducing agent, and after uniform mixing, the dosing device 11 includes a reagent storage device 12, a dosing pump 13, and an analytical instrument 14. The reagent storage device is connected to the dosing pump, and the output end of the dosing pump 13 is connected to the connecting pipe between the first-level high-pressure pump 2 and the reverse osmosis security filter 3. The detection end of the analytical instrument 14 is provided in the connecting pipe between the first-level high-pressure pump 2 and the reverse osmosis security filter 3. The dosage is controlled by the dosing pump 13 and the analytical instrument 14.

[0034] Specifically, a pH regulating device 15 is provided on the connecting pipe between the primary reverse osmosis device 4 and the secondary high-pressure pump 5 to adjust the pH value by adding alkali.

[0035] The working principle of an embodiment of the present invention: When the present invention is used, a suitable pretreatment process is selected according to the quality of the high-purity desalted water, including disinfection, clarification, filtration, activated carbon adsorption and other technologies, so that the turbidity of the pretreated water is less than 1NTU, the silt density index SDI is less than 5, and the COD is less than 30mg / L. The qualified pretreated water is stored in the pretreated water tank 1, and the pretreated water passes through the first-level high-pressure pump 2 and the reverse osmosis security filter 3 in turn and enters the first-level reverse osmosis device 4 for pre-desalination. The scale inhibitor and the reducing agent are added at the first-level high-pressure pump 2, and after uniform mixing, they enter the next level, wherein the first level The concentrated water from the reverse osmosis device 4 has a high salt content and is discharged or reused to other water use points. The produced water from the first-level reverse osmosis device 4 is directly pressurized by the second-level high-pressure pump 5 and then enters the second-level reverse osmosis device 6. The water inlet of the second-level high-pressure pump 5 needs to be added with alkali to adjust the pH value of the water. The concentrated water from the second-level reverse osmosis device 6 is returned to the pretreatment water tank 1 through a pipeline. The produced water from the second-level reverse osmosis device 6 enters the EDI device 9 through the EDI lifting pump 7 and the EDI security filter 8 for final desalination. The concentrated water from the EDI device 9 is returned to the pretreatment water tank 1 through a pipeline to increase the system recovery rate. The desalted water produced by the EDI device 9 is collected and enters the desalted water tank 10.

Claims

1. A short-process membrane desalination system, characterized in that: The invention comprises a pretreatment water production tank (1), wherein the water outlet of the treatment water production tank (1) is connected to a primary high-pressure pump (2) through a pipeline, the output end of the primary high-pressure pump (2) is connected to a reverse osmosis security filter (3) through a pipeline, the water outlet of the reverse osmosis security filter (3) is connected to a primary reverse osmosis device (4) through a pipeline, the water outlet of the primary reverse osmosis device (4) is connected to a secondary high-pressure pump (5) through a pipeline, the output end of the secondary high-pressure pump (5) is connected to a secondary reverse osmosis device (6) through a pipeline, the water outlet of the secondary reverse osmosis device (6) is connected to an EDI boost pump (7) through a pipeline, the output end of the EDI boost pump (7) is connected to an EDI security filter (8) through a pipeline, the water outlet of the EDI security filter (8) is connected to an EDI device (9) through a pipeline, and the water outlet of the EDI device (9) is connected to a desalted water tank (10) through a pipeline.

2. A short-process membrane desalination system according to claim 1, characterized in that: The concentrated water outlets of the secondary reverse osmosis device (6) and the EDI device (9) are connected to the pre-treated water production tank (1) through pipelines.

3. A short-process membrane desalination system according to claim 1, characterized in that: The primary high-pressure pump (2), the secondary high-pressure pump (5), and the EDI boost pump (7) are all connected to a frequency conversion controller.

4. A short-process membrane desalination system according to claim 1, characterized in that: The reverse osmosis safety filter (3) adopts a high-pressure resistant housing, and a folded large-flow filter element is used inside the safety filter (3), and the filtration accuracy of the folded large-flow filter element is 5 μm.

5. A short-process membrane desalination system according to claim 1, characterized in that: The filtering accuracy of the filter element inside the EDI security filter (8) is 1 μm.

6. A short-process membrane desalination system according to claim 1, characterized in that: A drug adding device (11) is provided on the connecting pipe between the primary high-pressure pump (2) and the reverse osmosis safety filter (3).

7. A short-process membrane desalination system according to claim 6, characterized in that: The dosing device (11) comprises a drug storage device (12), a drug dosing pump (13), and an analytical instrument (14); the drug storage device is connected to the drug dosing pump; the output end of the drug dosing pump is connected to a connecting pipe between a primary high-pressure pump (2) and a reverse osmosis safety filter (3); and the detection end of the analytical instrument (14) is arranged in the connecting pipe between the primary high-pressure pump (2) and the reverse osmosis safety filter (3).

8. A short-process membrane desalination system according to claim 1, characterized in that: A pH regulating device (15) is provided on the connecting pipeline between the primary reverse osmosis device (4) and the secondary high-pressure pump (5).

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