Production system for improving membrane desalination efficiency

Abstract

The utility model discloses a production system for improving membrane desalination efficiency, which comprises a cleaning water tank, a desalination circulation tank and a waste water tank, the top of the cleaning water tank and the top of the desalination circulation tank are connected with deionized water inlet pipelines, and a circulation desalination pipeline is connected between the bottom and the top of the desalination circulation tank. A deionized water supply pipeline is connected between the bottom of the cleaning water tank and the circulating desalting pipeline, a feeding pump, a filter, a booster pump and a membrane separation unit are sequentially mounted on the circulating desalting pipeline along the water flow direction, a material pressing cleaning pipeline and a desalting permeate liquid pipeline are further arranged on the membrane separation unit, and a material pressing water inlet valve is mounted on the material pressing cleaning pipeline. By fixing the solid content of raw materials, accurately measuring the pressure of each membrane shell, effectively emptying feed liquid in a membrane system and then cleaning, the membrane desalting efficiency can be effectively improved, the desalting time is shortened, the water cost is saved, and the wastewater discharge amount is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of membrane desalination processing, and particularly relates to a production system for improving the efficiency of membrane desalination. Background Art

[0002] At present, the method of desalination by membrane separation mainly uses one or more membrane combination systems to complete, but the desalination step consumes a large amount of water, takes a long time, and generates a large amount of wastewater, which greatly affects the production efficiency. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a production system for improving the efficiency of membrane desalination, which has a reasonable design, shortens the desalination time, and reduces the water consumption, aiming at the deficiencies of the prior art.

[0004] In order to achieve the above object, the utility model adopts the following technical scheme:

[0005] A production system for improving the efficiency of membrane desalination, characterized in that the system includes a cleaning water tank, a desalination circulation tank and a wastewater tank. The tops of the cleaning water tank and the desalination circulation tank are both connected with deionized water inlet pipes. A circulating desalination pipe is connected between the bottom and the top of the desalination circulation tank. A deionized water supply pipe is connected between the bottom of the cleaning water tank and the circulating desalination pipe. A feeding pump, a filter, a booster pump and a membrane separation unit are sequentially installed on the circulating desalination pipe along the water flow direction. The deionized water supply pipe is arranged on the feeding side of the feeding pump. A pressure feeding cleaning pipe connected to the deionized water inlet pipe and a desalination permeate pipe connected to the wastewater tank are also arranged on the membrane separation unit. A pressure feeding inlet valve is installed on the pressure feeding cleaning pipe, and a deionized water regulating valve is installed on the deionized water inlet pipe.

[0006] The technical problem to be solved by the utility model can also be realized by the following technical scheme. The membrane separation unit is provided with several sets of desalination filter membranes connected in series. The desalination filter membranes are selected from any one or a combination of two or more of microfiltration membranes, ultrafiltration membranes and nanofiltration membranes, and preferably nanofiltration membranes.

[0007] The technical problem to be solved by the utility model can also be realized by the following technical scheme. Pressure display instruments are installed on both the water inlet side and the water outlet side of each set of desalination filter membranes.

[0008] The technical problem to be solved by the utility model can also be realized by the following technical scheme. An on-line solid content detector is installed on the desalination circulation tank and the desalination permeate pipe. The on-line solid content detector is signal-connected to the deionized water regulating valve through a controller, and can adjust the amount of deionized water according to the solid content.

[0009] The technical problem to be solved by the present utility model can also be achieved by the following technical solution. An inlet water flowmeter is installed on the desalination circulation tank, which is convenient for counting and observing the water volume.

[0010] The technical problem to be solved by the present utility model can also be achieved by the following technical solution. A switching pipeline parallel to the booster pump is further provided between the filter and the membrane separation unit, and a valve is installed on the switching pipeline.

[0011] The technical problem to be solved by the present utility model can also be achieved by the following technical solution. Valves are installed at both the inlet end and the outlet end of the cleaning water tank, the desalination circulation tank, the membrane separation unit, and the wastewater tank.

[0012] The technical problem to be solved by the present utility model can also be achieved by the following technical solution. The valves on the inlet sides of the cleaning water tank and the desalination circulation tank are flow regulating valves.

[0013] Compared with the prior art, the present utility model realizes the cyclic desalination of raw materials through the desalination circulation tank with a cyclic desalination pipeline, improving the desalination effect; through the membrane separation unit, the high-salt crude product raw material becomes a low-salt product; through the pressure feeding and cleaning pipeline, all the product materials in the membrane separation system are discharged by pressure feeding before cleaning, significantly improving the cleaning efficiency, and the cleaning time can be shortened by 30-40%; through the cleaning water tank, deionized water is provided to the desalination circulation tank, and the water addition ratio is calculated by measuring the solid content to obtain stable raw materials, which is beneficial to the stable operation of the desalination system, can significantly reduce the desalination water consumption, and save 30-50% of water; by installing a deionized water regulating valve on the deionized water inlet pipeline, the water consumption is regulated. The production system for improving the membrane desalination efficiency described in the present utility model has a simple principle, a reasonable structure, less water consumption, and high desalination efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a structural diagram of the production system for improving the membrane desalination efficiency described in the present utility model;

[0015] Figure 2 is a schematic diagram of the production system for improving the membrane desalination efficiency described in the present utility model.

[0016] In the figure: 1-desalination circulation tank; 2-feeding pump; 3-filter; 4-booster pump; 5-desalination filter membrane; 6-cleaning water tank; 7-wastewater tank; 8-deionized water inlet pipeline; 9-pressure feeding and cleaning pipeline; 10-pressure feeding inlet valve; 11-switching pipeline; 12-cyclic desalination pipeline; 13-deionized water supply pipeline; 14-desalination permeate pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0018] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention 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 should not be construed as a limitation to the present invention.

[0019] Refer to Figure 1 and Figure 2 , a production system for improving the membrane desalination efficiency. The system includes a cleaning water tank 6, a desalination circulation tank 1, and a waste water tank 7. Deionized water inlet pipes 8 are connected to the tops of both the cleaning water tank 6 and the desalination circulation tank 1. A circulating desalination pipe 12 is connected between the bottom and the top of the desalination circulation tank 1. A deionized water supply pipe 13 is connected between the bottom of the cleaning water tank 6 and the circulating desalination pipe 12. A feed pump 2, a filter 3, a booster pump 4, and a membrane separation unit 5 are sequentially installed on the circulating desalination pipe 12 along the water flow direction. The deionized water supply pipe 13 is arranged on the feed side of the feed pump 2. A pressure feeding cleaning pipe 9 connected to the deionized water inlet pipe 8 and a desalination permeate pipe 14 connected to the waste water tank 7 are further provided on the membrane separation unit 5. A pressure feeding inlet valve 10 is installed on the pressure feeding cleaning pipe 9; a deionized water regulating valve is installed on the deionized water inlet pipe 8.

[0020] The membrane separation unit 5 is provided with several sets of desalination filter membranes connected in series. The desalination filter membranes are selected from any one or a combination of two or more of microfiltration membranes, ultrafiltration membranes, and nanofiltration membranes. Pressure display instruments are installed on both the water inlet side and the water outlet side of each set of desalination filter membranes. The structure of the membrane separation unit is the same as the structure of the membrane separation system disclosed in the prior art.

[0021] An on-line solid content detector is installed on the desalination circulation tank 1 and the desalination permeate pipe 14. The on-line solid content detector is in signal connection with the deionized water regulating valve through a controller. The on-line solid content detector described in the present invention is an on-line sugar meter.

[0022] An inlet flow meter is installed on the desalination circulation tank 1.

[0023] A switching pipe 11 is further provided between the filter 3 and the membrane separation unit 5 in parallel with the booster pump. A valve is installed on the switching pipe 11.

[0024] Valves are installed at the inlet and outlet ends of the cleaning water tank 6, desalination circulation tank 1, membrane separation unit 5, and wastewater tank 7. The valves on the inlet side of the cleaning water tank 6 and desalination circulation tank 1 are flow regulating valves.

[0025] The working process of the production system for improving membrane desalination efficiency described in this utility model includes a raw material balance step, a membrane desalination step, and a pressure feeding and cleaning step. In the raw material balance step, the raw material solid content is detected, the water addition ratio is calculated, and a stable raw material is obtained. In the membrane desalination step, the high-salt crude product raw material is changed into a low-salt product, and the wastewater is discharged. In the pressure feeding and cleaning step, the membrane desalination system is quickly cleaned and restored by switching the top material through the water pipeline. The production device includes a membrane separation unit for desalinating the high-salt crude product into a low-salt product and discharging the wastewater. The specific steps are as follows:

[0026] The first step, the raw material balance step

[0027] First, the high-salt crude product raw material is pumped into the desalination circulation tank, and the material is stirred to be evenly mixed. According to the result of the on-line solid content detector, the water addition amount is adjusted to make the raw material solid content stable at about 25%.

[0028] The second step, the membrane desalination step

[0029] The desalination feeding pump and desalination circulation pump are started, and the material is circulated at normal pressure through the desalination filter membrane and the desalination circulation tank until the material is evenly mixed. Then, the deionized water regulating valve is opened, and deionized water is continuously added to the desalination circulation tank automatically according to the feeding amount and solid content result of the membrane separation unit inlet to make the feeding solid content stable at a certain value within 20 - 30%, further preferably 23 ± 3%. The water consumption for the top material is 0.1 - 3 times the stock amount of the membrane system, generally 1 time. The filtration pressure of the desalination filter membrane is maintained at 20 - 30 bar, further preferably 25 - 27 bar. The desalination permeate is transported to the wastewater tank. An on-line solid content detector is installed on the desalination permeate transport pipeline, and the operation state of the desalination filter membrane, whether it is damaged, can be judged through the solid content detection result.

[0030] The third step, the pressure feeding and cleaning step

[0031] When the throughput of the membrane separation unit decreases and cleaning is required, the pressure feeding inlet valve of the pressure feeding and cleaning pipeline is opened, and all the materials existing in the system are pushed out from top to bottom to the desalination circulation tank, and then relevant agents are added through the cleaning water tank for the membrane cleaning process.

[0032] As can be seen from the above, this utility model can effectively improve the membrane desalination efficiency, reduce the desalination time, save water cost, and reduce the wastewater discharge amount by fixing the raw material solid content, accurately measuring the pressure of each membrane shell, and effectively emptying the material liquid in the membrane system before cleaning.

[0033] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, making equivalent substitutions or changes, shall be covered by the protection scope of the present utility model.

Claims

1. A production system for improving the desalination efficiency of a membrane, characterized in that, The system includes a cleaning water tank, a desalination circulation tank and a waste water tank. Deionized water inlet pipes are connected to the tops of the cleaning water tank and the desalination circulation tank. A circulating desalination pipe is connected between the bottom and the top of the desalination circulation tank. A deionized water supply pipe is connected between the bottom of the cleaning water tank and the circulating desalination pipe. A feeding pump, a filter, a booster pump and a membrane separation unit are sequentially installed on the circulating desalination pipe along the water flow direction. The deionized water supply pipe is arranged on the feeding side of the feeding pump. A pressure feeding cleaning pipe connected to the deionized water inlet pipe and a desalination permeate pipe connected to the waste water tank are further arranged on the membrane separation unit. A pressure feeding inlet valve is installed on the pressure feeding cleaning pipe. A deionized water regulating valve is installed on the deionized water inlet pipe.

2. The production system for improving the desalination efficiency of the membrane according to claim 1, wherein The membrane separation unit is provided with several sets of desalination filter membranes connected in series. The desalination filter membranes are selected from any one or a combination of two or more of microfiltration membranes, ultrafiltration membranes and nanofiltration membranes.

3. The production system for improving the membrane desalination efficiency according to claim 2, characterized in that, Pressure display instruments are installed on both the water inlet side and the water outlet side of each set of desalination filter membranes.

4. A production system for improving the desalination efficiency of a membrane, characterized in that, An on-line solid content detector is installed on the desalination circulation tank and the desalination permeate pipe. The on-line solid content detector is signal-connected to the deionized water regulating valve through a controller.

5. A production system for improving the desalination efficiency of a membrane, characterized in that, An inlet flowmeter is installed on the desalination circulation tank.

6. A production system for improving the desalination efficiency of a membrane, characterized in that, A switching pipe parallel to the booster pump is further arranged between the filter and the membrane separation unit. A valve is installed on the switching pipe.

7. A production system for improving the desalination efficiency of a membrane, characterized in that, Valves are installed at the inlet ends and outlet ends of the cleaning water tank, the desalination circulation tank, the membrane separation unit and the waste water tank.

8. A production system for improving the desalination efficiency of a membrane, characterized in that, The valves on the inlet sides of the cleaning water tank and the desalination circulation tank are flow regulating valves.

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