CN108147575A - A kind of desalination by reverse osmosis equipment - Google Patents

Abstract

The present invention is a kind of reverse osmosis desalination equipment, comprising at least two multi-medium sand filter tank units connected in parallel, each multimedia sand filter tank unit includes a multimedia sand filter tank, a three-way valve and two check valves ; The first port of the multimedia sand filter tank is connected to the second port of the three-way valve, and the second port of the multimedia sand filter tank is connected to the inlet port of the first check valve and the outlet port of the second check valve at the same time; The outlet port of the first check valve is used to output the medium filtered by the multi-media sand filter tank; the inlet port of the second check valve is used to input the backwash medium; the first port of the three-way valve is connected to the inlet of the water to be treated, and the three-way The third port of the through valve is connected to the drain port. The invention does not need to stop production during backwashing, and the sand filter tank is backwashed at any time during the production process to ensure that the sand filter tank is clean, effective, long-lived and maintenance-free.

Description

A kind of reverse osmosis desalination equipment

technical field

The invention relates to the field of reverse osmosis desalination, in particular to a reverse osmosis desalination device.

Background technique

Seawater desalination equipment using reverse osmosis seawater desalination technology, which includes a 4-stage filtration pretreatment system, raw seawater enters the equipment from the seawater inlet of the equipment, and flows through a series of filters successively: multi-media sand filter tank, bag filter filter, first-stage cartridge filter and second-stage cartridge filter. Pretreatment is to protect the reverse osmosis membrane and prolong the service life of the reverse osmosis membrane. The first function of pretreatment is filtration, through the multi-media sand filter tank, bag filter and core filter to reduce the suspended solids reaching the reverse osmosis membrane. The second function of pretreatment is to remove chlorine. The multi-media sand filter tank contains granular activated carbon, which can remove chlorine in seawater and prevent the surface of the reverse osmosis membrane from being corroded and damaged by chlorine. The above shows that it is necessary to backwash the multi-media sand filter tank to maintain the filtration and chlorine removal functions of the multi-media sand filter tank and to prolong its service life.

In the prior art, the multi-media sand filter tank is backwashed, and the shutdown backwashing method is generally adopted. The whole machine is specially equipped with a backwashing water storage tank and a backwashing pump. During backwashing, the water production is stopped, and the corresponding valve is switched. Start the backwash pump, suck the water in the backwash water storage tank, and reversely pump it into the multi-media sand filter tank to realize backwash. Shutdown for backwash affects the efficiency of the reverse osmosis equipment and reduces the fresh water output. Improper selection of the backwash cycle will also affect the efficiency of the reverse osmosis equipment. In severe cases, the reverse osmosis membrane may be damaged, resulting in corresponding equipment maintenance expenses.

The information disclosed in the background of the present invention is only intended to deepen the understanding of the general background of the present invention, and should not be considered as an acknowledgment or in any form to imply that the information constitutes the prior art known to those skilled in the art.

Contents of the invention

The purpose of the present invention is to solve one of the technical problems existing in the prior art, to provide a reverse osmosis desalination equipment, which does not stop the fresh water production when backwashing the multi-media sand filter tank, and improves the working efficiency of the reverse osmosis equipment and fresh water desalination equipment. Yield.

The object of the present invention is achieved like this: a kind of reverse osmosis desalination equipment, comprises at least two multimedia sand filter tank units connected in parallel, each multimedia sand filter tank unit includes a multimedia sand filter tank, a three-way valve and two check valves;

The first port of the multimedia sand filter tank is connected to the second port of the three-way valve, and the second port of the multimedia sand filter tank is connected to the inlet port of the first check valve and the second check valve at the same time the export port;

The outlet port of the first check valve is used to output the medium filtered by the multi-media sand filter tank; the inlet port of the second check valve is used to input the backwash medium;

The first port of the three-way valve is connected to the water inlet to be treated, and the third port of the three-way valve is connected to the drain.

In a preferred embodiment of the present invention, it also includes a filter assembly, a high-pressure pump and a reverse osmosis membrane; the outlet end of the first check valve is connected to the inlet port of the filter assembly; The outlet port is connected to the inlet port of the high-pressure pump, and the outlet port of the high-pressure pump is connected to the inlet port of the reverse osmosis membrane.

In a preferred embodiment of the present invention, the outlet end of the high-pressure concentrated water of the reverse osmosis membrane is connected to the inlet end of the capillary, and the outlet end of the capillary is respectively connected to the inlet end of the second check valve and the pressure control valve. , the pressure control valve is connected to the drain port.

In a preferred embodiment of the present invention, a controller is also included for controlling the conduction direction of the three-way valve.

In a preferred embodiment of the present invention, it also includes an actuator, the controller is connected to the actuator, the actuator is connected to the control end of the three-way valve, and the three-way valve is controlled by the actuator. Direction of valve conduction.

In a preferred embodiment of the present invention, at least one multimedia sand filter unit is in a filtering state.

Compared with prior art, the beneficial effect of the present invention is:

By setting at least two multimedia sand filter tank units connected in parallel, each multimedia sand filter tank unit includes a multimedia sand filter tank, a three-way valve and two check valves; the first multimedia sand filter tank unit The port is connected to the second port of the three-way valve, and the second port of the multi-media sand filter tank is connected to the inlet port of the first check valve and the outlet port of the second check valve at the same time; the outlet port of the first check valve is used for The medium filtered by the multi-media sand filter tank is output; the inlet port of the second check valve is used for inputting backwashing medium. By controlling the conduction direction of the three-way valve, at least one multimedia sand filter tank unit is in the filtering state at the same time to produce fresh water normally, while other multimedia sand filter tank units are in the backwashing state. There is no need to stop production during backwashing, and the multi-media sand filter tank is backwashed at any time during the production process to ensure that the sand filter tank is clean, effective, long-lived, and maintenance-free. By non-stop backwashing, the efficiency of the whole machine and fresh water production are increased by 30-50% based on the optimized backwashing/production time ratio of 1/3-1/2.

In addition, the high-pressure concentrated water outlet of the reverse osmosis membrane is connected to the inlet of the capillary, and the outlet of the capillary is respectively connected to the inlet and the drain of the second check valve. Utilization of high-pressure concentrated water waste water, energy recovery, the power of backwash water comes from the pressure-reduction utilization technology of capillary high-pressure concentrated water, eliminating the need for backwash pumps, which account for 7%-15% of the total machine consumption. Energy consumption is thus saved.

The present invention optimizes various indicators such as the use cost, reliability, ease of use, maintenance amount and the like of the equipment through simple pipeline components and pipeline design.

Other features and advantages possessed by the device of the present invention will become apparent or be more particularly set forth in the accompanying drawings, which, together with the accompanying drawings, serve to illustrate some principles of the invention.

Description of drawings

Fig. 1 is a schematic connection diagram of an exemplary embodiment of a reverse osmosis desalination device of the present invention.

Explanation of reference signs:

1. Water inlet to be treated; 2. Drain outlet; 3-1, 3-2, three-way valve; 4-1, 4-2 actuator; 5, 7, multi-media sand filter tank; 5-1, 7- 1. The first port of the multi-media sand filter tank, 5-2, 7-2 the second port of the multi-media sand filter tank; 6. Pressure control valve; 8-1, 9-1, the first check valve; 8 -2, 9-2, second check valve; 10, filter assembly; 11, high pressure pump; 12, reverse osmosis membrane; 13, output fresh water; 14, capillary tube; 15, low pressure concentrated water; 16, programmable controller.

It should be understood that the appended drawings are not to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, locations and shapes will be determined in part by the particular intended application and use environment.

In the figures, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing.

Detailed ways

Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with exemplary embodiments, it will be understood that present description is not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiments but also various alternatives, modifications, equivalents and other alternatives, modifications, equivalents and others, which may be included within the spirit and scope of the invention as defined by the appended claims. implementation plan.

Technical terms used in the following description are for the purpose of describing particular embodiments only and are not intended to limit the present invention.

All terms including technical terms and scientific terms used in the following description may have meanings generally understood by those skilled in the art unless otherwise specified. In addition, terms defined in commonly used dictionaries are interpreted as having meanings consistent with disclosures of related technical documents and the present invention, and are not interpreted as having ideal or overly formal meanings unless otherwise specified.

Hereinafter, a reverse osmosis desalination apparatus according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings. The reverse osmosis desalination equipment can be used for desalination treatment of seawater, and can also be used for other liquids that need desalination treatment. The following examples aim at the desalination treatment of seawater.

Referring to FIG. 1 , it is a schematic connection diagram of an exemplary embodiment of reverse osmosis desalination equipment of the present invention. The reverse osmosis desalination equipment includes two parallel-connected multimedia sand filter tank units, a filter assembly 10 , a high-pressure pump 11 and a reverse osmosis membrane 12 . In the exemplary embodiment shown in Fig. 1, two multimedia sand filter tank units are provided, and the number of multimedia sand filter tank units can be increased as required, thereby increasing the filtration capacity of the reverse osmosis equipment. The embodiment in which the number of multimedia sand filter tank units is more than two can be obtained on this basis by those skilled in the art without any creative work, and will not be repeated here. Among them, the multimedia sand filter tank 5, the three-way valve 3-1, the first check valve 8-1 and the second check valve 8-2 constitute the first multimedia sand filter tank unit; the multimedia sand filter tank 7. The three-way valve 3-2, the first check valve 9-1 and the second check valve 9-2 constitute the second multimedia sand filter tank unit. Two multimedia sand filter units are connected in parallel in this plant. The first port 5-1 of the multimedia sand filter tank 5 is connected to the second port of the three-way valve 3-1, and the second port 5-2 of the multimedia sand filter tank 5 is connected to the first check valve 8-1 at the same time. The inlet port and the outlet port of the second check valve 8-2. The first port of the three-way valve 3-1 is connected to the water inlet 1 to be treated, and the third port of the three-way valve 3-1 is connected to the drain port 2. Similarly, the first port 7-1 of the multimedia sand filter tank 7 is connected to the second port of the three-way valve 3-2, and the second port 7-2 of the multimedia sand filter tank 7 is connected to the first check valve 9-2 at the same time. 1 inlet port and the outlet port of the second check valve 9-2. The first port of the three-way valve 3-2 is connected to the water inlet 1 to be treated, and the third port of the three-way valve 3-2 is connected to the drain port 2 . From Figure 1, the upper end of each check valve is the outlet end, and the lower end of the check valve is the inlet end, and the medium can be unidirectionally conducted from the inlet end of the check valve to the outlet end of the check valve. The outlet ports of the first check valves 8-1 and 9-1 are connected to the inlet port of the filter assembly 10; the outlet port of the filter assembly 10 is connected to the inlet port of the high-pressure pump 11, and the outlet port of the high-pressure pump 11 is connected to the reverse osmosis membrane At the inlet end of 12, after the seawater is filtered by the reverse osmosis membrane 12, the produced fresh water 13 flows out from the outlet end of the reverse osmosis membrane 12. The outlet end of the high-pressure concentrated water of the reverse osmosis membrane 12 is connected to the inlet port of the capillary 14, and the outlet port of the capillary 14 is respectively connected to the inlet port of the second check valve 8-2 and 9-2 and the pressure control valve 6, the pressure control valve 6 Connect to drain port 2. The high-pressure concentrated water flows into the capillary 14 from the high-pressure concentrated water outlet end of the reverse osmosis membrane 12, and through the flow restriction and pressure reduction of the capillary 14, and through the pressure adjustment of the pressure control valve 6, a certain pressure is formed after flowing out from the outlet of the capillary 14. Low-pressure concentrated water 15. The low-pressure concentrated water 15 can reversely enter the multimedia sand filter tank 5 or the multimedia sand filter tank 7 from the inlet port of the second check valve 8-2 or the inlet port of the second check valve 9-2, and reverse towards flushing.

The conduction direction of the three-way valve 3-1 is set to conduct from the first port to the second port, and the conduction direction of the three-way valve 3-2 is set to conduct from the second port to the third port, so that The multi-media sand filter tank 5 is in the filtering state. After the seawater is filtered through the multi-media sand filter tank 5, it flows to the filter assembly 10 through the first check valve 8-1 for further filtration; it is pumped into the reverse osmosis membrane 12 through the high-pressure pump 11; at the same time , the multi-media sand filter tank 7 is in the backwashing state, and the high-pressure concentrated water generated after being treated by the reverse osmosis membrane 12 flows into the capillary 14 from the outlet end of the high-pressure concentrated water, and the capillary 14 restricts the flow and reduces the pressure, and the pressure control valve 6 After the pressure is adjusted, the low-pressure concentrated water 15 is formed; a part of the low-pressure concentrated water 15 flows out from the drain port 2, and a part of the low-pressure concentrated water 15 flows through the second check valve 9-2 from the inlet end of the second check valve 9-2. , flows into the multimedia sand filter tank 7 from the second port 7-2 of the multimedia sand filter tank 7, flows out from the first port 7-1 of the multimedia sand filter tank 7, and then flows to the drain through the three-way valve 3-2 Port 2 is discharged to form a reverse flushing of the multimedia sand filter tank 7. The running direction of the water flow is marked with solid arrows in the figure. The water circuit is separated by the set check valve, so that seawater filtration and low-pressure concentrated water backwashing are not confused with each other, do not interfere with each other, and can reliably complete water production and backwashing simultaneously without stopping the machine. After a period of time, the conduction directions of the three-way valve 3-1 and the three-way valve 3-2 are changed, and the states of the multimedia sand filter tank 5 and the multimedia sand filter tank 7 are switched. Of course, it is necessary to ensure that at least one multimedia sand filter tank is in the filtering state.

Further, the conduction direction of the three-way valve can be automatically controlled by the programmable controller 16 and the actuator. The control ends of the three-way valves 3-1 and 3-2 are respectively connected to the actuators 4-1 and 4-2, and the actuators 4-1 and 4-2 are connected to the programmable controller 16, and the programmable controller is controlled by the actuator. The conduction direction of the three-way valve is automatically changed according to the programmed program. At the same time, the invention utilizes the cooperation of the check valve and the three-way valve, which simplifies the control, reduces the cost and improves the reliability.

The control logic of programmable controller 16 is as follows:

a. At a certain moment, the programmable controller 16 controls the conduction direction of the three-way valve 3-1 through the actuator 4-1, so that seawater enters the multimedia sand filter tank 5 for seawater filtration. The final seawater enters the filter assembly 10 through the check valve 8-1;

b. At the same time, the programmable controller 16 controls the conduction direction of the three-way valve 3-2 through the actuator 4-2, so that the low-pressure concentrated water 15 can enter the three-way valve 9-2 through the check valve 9-2. The multimedia sand filter tank 7 is backwashed to the multimedia sand filter tank 7, and then discharged into the water outlet 2 through the three-way valve 3-2;

c. The filtering state and the backwashing state of the multi-media sand filter tank 5 and the multi-media sand filter tank 7 are alternately and cyclically performed, and the time and alternating sequence are controlled by the programmable controller 16 .

It should be noted that, according to the above preferred embodiments, those skilled in the art can also obtain: the high-pressure concentrated water generated by the reverse osmosis membrane 12 can not be used, and other backwashing medium sources can be set separately, and the backwashing medium source can be connected to the first The inlet port of the second check valve is enough.

In summary, advantages and beneficial effects of the present invention

1. There is no need to stop production during backwashing, and the sand filter tank is backwashed at any time during the production process to ensure that the sand filter tank is clean, effective, long-lived, and maintenance-free. Non-stop backwashing method, calculated according to the optimized backwashing/production time ratio of 1/3-1/2, the efficiency and output of the whole machine have increased by 30-50%;

2. Wastewater utilization, energy recovery, no need for water storage tanks, backwash pumps, and backwash pumps account for 7%-15% of the total machine consumption, saving energy consumption.

3. The backwashing method adopts a simple check valve and a three-way valve, so that the equipment's use cost, reliability, ease of use, maintenance and other indicators can be optimized.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. The foregoing description is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to enable others skilled in the art to make and use the various exemplary embodiments and various alternatives and modifications of the invention . It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

Claims (6)

1. a kind of desalination by reverse osmosis equipment, which is characterized in that the multimedium sandfiltration pot unit being connected in parallel including at least two, often A multimedium sandfiltration pot unit includes a multimedium sandfiltration pot, a triple valve and two check-valves；

The first port of the multimedium sandfiltration pot is connect with the second port of the triple valve, and the of the multimedium sandfiltration pot Two-port netwerk connects the arrival end of first check-valve and the port of export of second check-valve simultaneously；

Medium of the port of export of the first check-valve for output after multimedium sandfiltration pot filtering；Described second stops The arrival end of valve is returned for inputting backwash medium；

The first port connection accessing pending water entrance of the triple valve, the third port connection discharge outlet of the triple valve.

2. desalination by reverse osmosis equipment as described in claim 1, which is characterized in that further include filter assemblies, high-pressure pump and Reverse osmosis membrane；The port of export of the first check-valve connects the arrival end of the filter assemblies；The filter assemblies go out Mouth end connects the arrival end of the high-pressure pump, and the port of export of the high-pressure pump connects the arrival end of the reverse osmosis membrane.

3. desalination by reverse osmosis equipment as claimed in claim 2, which is characterized in that the high-pressure thick water outlet of the reverse osmosis membrane The arrival end of end connection capillary, the port of export of the capillary connect the arrival end of the second check-valve and pressure control respectively Valve processed, the pressure-control valve are connected to the discharge outlet.

4. desalination by reverse osmosis equipment as described in any one of claims 1 to 3, which is characterized in that controller is further included, for controlling Make the conducting direction of the triple valve.

5. desalination by reverse osmosis equipment as claimed in claim 4, which is characterized in that further include actuator, the controller connection The actuator, the actuator connect the control terminal of the triple valve, and leading for the triple valve is controlled by the actuator Logical direction.

6. desalination by reverse osmosis equipment as described in claim 1, which is characterized in that at least one multimedium sandfiltration pot unit In filtration condition.