Small-flow reverse osmosis system

Abstract

The utility model belongs to the technical field of water treatment, and provides a small-flow reverse osmosis system, comprising: a raw water end for supplying raw water; the pure water end is used for enabling the filtered pure water to flow out; two ends of the main pipeline are respectively communicated with the raw water end and the pure water end; the water supply pump is arranged on the main pipeline and used for providing power to pump raw water into the main pipeline; the reverse osmosis module is arranged on the main pipeline, is positioned between the water supply pump and the pure water end and is used for filtering raw water; one end of the return pipeline is communicated with the main pipeline, the other end of the return pipeline is communicated with the reverse osmosis module, and at least part of concentrated water generated by the reverse osmosis module circularly flows back to the main pipeline through the return pipeline and converges with raw water pumped out by the water supply pump; the water supply quantity of the reverse osmosis module can be increased, so that the water yield is increased, and the water production rate of the whole system is increased.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, and in particular to a low-flow reverse osmosis system. Background Technology

[0002] A reverse osmosis system mainly uses a reverse osmosis membrane to filter raw water under water pressure, producing a certain amount of pure water and discharging the remaining water as concentrate. The principle is that under pressure higher than the osmotic pressure of the solution, other substances cannot pass through the semi-permeable membrane, thus separating these substances from the water. Due to the characteristics of reverse osmosis itself, the water production rate of a single reverse osmosis membrane has a certain limit. When the feed water flow rate is small, the water production flow rate will be limited, thereby affecting the water production rate of the entire system. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this application is to provide a low-flow reverse osmosis system to solve the problem that the water production rate of the prior art reverse osmosis system is limited when the feed water flow rate is relatively small.

[0004] To achieve the above and other related objectives, this application provides a low-flow reverse osmosis system, comprising:

[0005] Raw water end, used to supply raw water;

[0006] The pure water end is used to discharge filtered pure water.

[0007] The main pipeline is connected at both ends to the raw water end and the pure water end, respectively.

[0008] A water supply pump is installed on the main pipeline to provide power to pump raw water into the main pipeline;

[0009] A reverse osmosis module is installed on the main pipeline, located between the water supply pump and the pure water end, for filtering raw water;

[0010] The return pipeline has one end connected to the main pipeline and the other end connected to the reverse osmosis module. At least part of the concentrate produced by the reverse osmosis module is circulated back to the main pipeline through the return pipeline and merges with the raw water pumped out by the water supply pump.

[0011] Optionally, the low-flow reverse osmosis system also includes a drainage pipe connected to the return pipe, with one end of the drainage pipe connected to the return pipe and the other end connected to the wastewater end, and at least a portion of the concentrate is discharged into the wastewater end through the drainage pipe.

[0012] Optionally, a drainage regulating valve is provided on the drainage pipeline to control the drainage flow rate of the drainage pipeline.

[0013] Optionally, a reflux regulating valve is provided on the reflux pipeline to control the flow rate of concentrated water circulating back to the main pipeline.

[0014] Optionally, a temperature control device is also provided on the main pipeline. The temperature control device is located between the water supply pump and the reverse osmosis module. The temperature control device is used to adjust the water temperature flowing to the reverse osmosis module.

[0015] Optionally, one end of the return pipeline connected to the main pipeline is located between the water supply pump and the temperature control device.

[0016] Optionally, the reverse osmosis module includes multiple reverse osmosis membranes.

[0017] Optionally, the side of the reverse osmosis module closest to the raw water end is the inlet side, and the side of the reverse osmosis module closest to the raw water end is the outlet side.

[0018] Optionally, a booster pump is also provided on the main pipeline. The booster pump is located between the temperature control device and the reverse osmosis module. The booster pump is used to pressurize the water flowing into the inlet side.

[0019] Optionally, the booster pump is a high-pressure circulating pump.

[0020] In the low-flow reverse osmosis system provided in this application, when the feed water flow rate is small, a portion of the concentrate is returned to the main pipeline through the return pipeline, so that the concentrate mixes with the feed water. The returned concentrate can be reused, increasing the feed water flow rate, increasing the water supply to the reverse osmosis module, thereby increasing the water production and improving the overall water production rate of the system. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a low-flow reverse osmosis system shown in Embodiment 1 of this application.

[0022] Part Number Explanation

[0023] 1-Raw water end; 2-Water supply pump; 3-Temperature control device; 4-Booster pump; 5-Reverse osmosis module; 6-Pure water end; 7-Waste water end; 8-Drainage regulating valve; 9-Return regulating valve; 10-Main pipeline; 11-Return pipeline; 12-Drainage pipeline. Detailed Implementation

[0024] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification.

[0025] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness or purpose of this application, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "front," "back," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this application. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this application.

[0026] Please see Figure 1 This application exemplarily proposes a low-flow reverse osmosis system, comprising:

[0027] Raw water end 1 is used to supply raw water;

[0028] Pure water end 6 is used to discharge filtered pure water;

[0029] Main pipe 10, with its two ends connected to raw water end 1 and pure water end 6 respectively;

[0030] Water supply pump 2 is installed on the main pipeline 10 to provide power to pump raw water into the main pipeline 10;

[0031] The reverse osmosis module 5 is installed on the main pipeline 10, located between the water supply pump 2 and the pure water end 6, and is used to filter the raw water.

[0032] The return pipe 11 is connected at one end to the main pipe 10 and at the other end to the reverse osmosis module 5. At least part of the concentrate produced by the reverse osmosis module 5 is circulated back to the main pipe 10 through the return pipe 11 and merges with the raw water pumped out by the water supply pump 2.

[0033] In the low-flow reverse osmosis system provided in this application, when the feed water flow rate is small, part of the concentrate is returned to the main pipeline 10 through the return pipeline 11, so that the concentrate is mixed with the raw water. The returned concentrate can be reused, increasing the feed water flow rate, increasing the feed water to the reverse osmosis module 5, thereby increasing the water production and improving the overall water production rate of the system.

[0034] In this embodiment, the low-flow reverse osmosis system also includes a drain pipe 12 connected to the return pipe 11. One end of the drain pipe 12 is connected to the return pipe 11, and the other end is connected to the wastewater end 7. At least a portion of the concentrate is discharged into the wastewater end 7 through the drain pipe 12. Specifically, the concentrate produced by the reverse osmosis module 5 can be diverted into the return pipe 11 and the drain pipe 12. A drain regulating valve 8 is provided on the drain pipe 12 to control the drainage flow rate of the drain pipe 12. The drainage flow rate can be adjusted by the drain regulating valve 8, thereby adjusting the flow rate of the concentrate entering the return pipe 11, and thus adjusting the feed water flow rate of the main pipe 10.

[0035] In the above embodiment, a reflux regulating valve 9 is provided on the reflux pipeline 11 to control the flow rate of concentrated water circulating back to the main pipeline 10. The drain pipeline 12 is located between the reflux regulating valve 9 and the reverse osmosis module 5. The reflux regulating valve 9 regulates the flow rate of concentrated water circulating back to the main pipeline 10, and the drain regulating valve 8 is used to regulate the drainage flow rate, thereby increasing the flow rate regulation range and increasing the water supply in the main pipeline 10.

[0036] In this embodiment, a temperature control device 3 is also provided on the main pipeline 10. The temperature control device 3 is located between the water supply pump 2 and the reverse osmosis module 5. The temperature control device 3 is used to regulate the water temperature flowing to the reverse osmosis module 5. Specifically, the pore size of the reverse osmosis membrane is affected by temperature. Therefore, the feed water temperature will also affect the water production of the reverse osmosis membrane, thereby affecting the water production rate. By controlling the water temperature through the temperature control component, the water temperature of the water entering the pore size of the reverse osmosis membrane is kept within a suitable range, and the water production rate will not be affected by sudden temperature changes.

[0037] In some embodiments, the end of the return pipeline 11 connected to the main pipeline 10 is located between the water supply pump 2 and the temperature control device 3. By connecting the return pipeline 11 after the water supply pump 2 and before the temperature control device 3, the return concentrate and the raw water can be mixed together and then the water temperature is controlled by the temperature control device 3.

[0038] In this embodiment, the reverse osmosis module 5 includes multiple reverse osmosis membranes. Specifically, since the concentrated water is recycled and mixed with the raw water for circulation, the concentration of the raw water will be increased. In order to increase the water production, the reverse osmosis membrane uses multi-end fouling-resistant and high-pressure membrane elements to ensure the filtration effect.

[0039] In the above embodiment, the side of the reverse osmosis module 5 closest to the raw water end 1 is the inlet side, and the side of the reverse osmosis module 5 closest to the raw water end 1 is the outlet side. The temperature control device 3 is located on the main pipeline 10 near the inlet side of the reverse osmosis module 5. By controlling the water temperature, the temperature of the water flowing into the inlet side is controlled, thereby controlling the temperature of the reverse osmosis membrane.

[0040] In this embodiment, a booster pump 4 is also provided on the main pipeline 10. The booster pump 4 is located between the temperature control device 3 and the reverse osmosis module 5. The booster pump 4 is used to pressurize the water flow into the inlet side. Specifically, the pressure of the booster pump 4 will also affect the water production. If the water flow pressure is insufficient, the water production rate will be limited. By increasing the water pressure through the booster pump 4, the inlet flow rate can be effectively increased, thereby increasing the water production rate. The booster pump 4 is a high-pressure circulating pump.

[0041] It is worth noting that a lower feedwater flow rate refers to a feedwater flow rate of 1-5 tons / hour. In this case, the permeate flow rate of the reverse osmosis system will be limited, thereby limiting the overall system permeate rate. This application increases the feedwater flow rate by mixing the concentrate with the feedwater. The concentrate recirculation ratio can be adjusted within the range of 30-70%. After increasing the feedwater flow rate by recirculating the concentrate, the permeate rate can reach 80-90%. Please refer to the following examples for details:

[0042] Example 1

[0043] The system feedwater flow rate at raw water end 1 is 1 ton / hour, with a planned production of pure water exceeding 70%, i.e., 0.7 tons. The maximum water production capacity of each reverse osmosis membrane is 0.22 tons / hour. Reverse osmosis membrane module 5 requires four 4040 reverse osmosis membranes, each with a recovery rate of 12%. Using four membranes in series for filtration, the water production rate can be achieved by adjusting the reflux ratio as follows: when the reflux ratio is adjusted to 60%, the water production rate of the reverse osmosis system is 71%; when the reflux ratio is adjusted to 70%, the water production rate of the reverse osmosis system is 79%; and when the reflux ratio is adjusted to 80%, the water production rate of the reverse osmosis system is 83.3%.

[0044] Example 2

[0045] The system feedwater flow rate at raw water end 1 is 2 tons / hour, and the planned production of 70% pure water, i.e., 1.4 tons, is required. The maximum water production capacity of each reverse osmosis membrane is 0.22 tons / hour. Reverse osmosis membrane module 5 requires 8 4040 reverse osmosis membranes, each with a recovery rate of 12%. Using 8 membranes in series, the water production rate can be achieved by adjusting the reflux ratio as follows: when the reflux ratio is adjusted to 40%, the water production rate of the reverse osmosis system is 75.4%; when the reflux ratio is adjusted to 50%, the water production rate of the reverse osmosis system is 78.7%; when the reflux ratio is adjusted to 60%, the water production rate of the reverse osmosis system is 82.1%; and when the reflux ratio is adjusted to 70%, the water production rate of the reverse osmosis system is 85.7%.

[0046] In summary, in the low-flow reverse osmosis system provided in this application, when the feed water flow rate is large, it is not necessary to open the reflux regulating valve 9; only the drain regulating valve 8 needs to be opened for normal water treatment. When the feed water flow rate is small, the reflux regulating valve 9 is opened, and the reflux ratio is adjusted in conjunction with the drain regulating valve 8. A certain proportion of concentrated water is returned to the main pipeline 10 through the reflux pipeline 11. The returned concentrated water can be reused, allowing the concentrated water to mix with the raw water, increasing the feed water flow rate, increasing the feed water to the reverse osmosis module 5, thereby increasing the water production and improving the overall water production rate of the system.

[0047] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A low-flow-rate reverse osmosis system, characterized in that, include: Raw water end, used to supply raw water; The pure water end is used to discharge filtered pure water. The main pipeline has two ends connected to the raw water end and the pure water end, respectively; A water supply pump is installed on the main pipeline to provide power to pump raw water into the main pipeline; A reverse osmosis module is installed on the main pipeline, located between the water supply pump and the pure water end, for filtering raw water; The return pipeline has one end connected to the main pipeline and the other end connected to the reverse osmosis module. At least part of the concentrate produced by the reverse osmosis module is circulated back to the main pipeline through the return pipeline and merges with the raw water pumped out by the water supply pump.

2. The low-flow reverse osmosis system according to claim 1, characterized in that, It also includes a drainage pipe connected to the return pipe, one end of which is connected to the return pipe and the other end is connected to the wastewater end, and at least part of the concentrated water is discharged into the wastewater end through the drainage pipe.

3. The low-flow reverse osmosis system according to claim 2, characterized in that, The drainage pipeline is equipped with a drainage regulating valve to control the drainage flow rate.

4. The low-flow reverse osmosis system according to claim 1, characterized in that, A reflux regulating valve is installed on the reflux pipeline to control the flow rate of concentrated water circulating back to the main pipeline.

5. The low-flow reverse osmosis system according to claim 1, characterized in that, A temperature control device is also installed on the main pipeline. The temperature control device is located between the water supply pump and the reverse osmosis module. The temperature control device is used to regulate the water temperature flowing to the reverse osmosis module.

6. The low-flow reverse osmosis system according to claim 5, characterized in that, One end of the return pipeline is connected to the main pipeline and is located between the water supply pump and the temperature control device.

7. The low-flow reverse osmosis system according to claim 5, characterized in that, The reverse osmosis module includes multiple reverse osmosis membranes.

8. The low-flow reverse osmosis system according to claim 5, characterized in that, The side of the reverse osmosis module closest to the raw water end is the inlet side, and the side of the reverse osmosis module closest to the raw water end is the outlet side.

9. The low-flow reverse osmosis system according to claim 8, characterized in that, A booster pump is also installed on the main pipeline. The booster pump is located between the temperature control device and the reverse osmosis module. The booster pump is used to pressurize the water flowing into the inlet side.

10. The low-flow reverse osmosis system according to claim 9, characterized in that, The booster pump is a high-pressure circulating pump.

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