Energy recovery device and energy-saving pump

Abstract

The invention relates to the technical field of seawater desalination treatment, and discloses an energy recovery device and an energy-saving pump, the energy recovery device comprises a shell, a vertical partition plate is arranged in the shell, a transverse moving piston rod is arranged on the partition plate, a first piston and a second piston are arranged on the piston rod, a first pressure cavity is formed between the vertical partition plate and the first piston, and a second pressure cavity is formed between the vertical partition plate and the second piston; a first pressurizing cavity is formed between the first piston and the shell, and a second pressurizing cavity is formed between the second piston and the shell. The first pressure cavity is connected with a first high-pressure water inlet pipe and a first low-pressure water outlet pipe, the second pressure cavity is connected with a second high-pressure water inlet pipe and a second low-pressure water outlet pipe, and valves are arranged on corresponding pipelines; the first pressurizing cavity is connected with a first low-pressure water inlet pipe and a first high-pressure water outlet pipe. The second pressurizing cavity is connected with a second low-pressure water inlet pipe and a second high-pressure water outlet pipe. The device can recycle the excess pressure energy of the high-pressure concentrated water, and is simple in structure and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of seawater desalination treatment, and more specifically, to an energy recovery device and an energy-saving pump. Background Art

[0002] In the reverse osmosis seawater desalination process, seawater is mainly pressurized by a high-pressure pump to be greater than the osmotic pressure of the reverse osmosis membrane. The seawater permeates through the reverse osmosis membrane to form fresh water, and the salt is blocked on the concentrated water side and discharged with the concentrated water, so that the seawater is desalted and purified. The operating pressure of the reverse osmosis seawater desalination system is generally 5 - 6 MPa. The pressure of the concentrated seawater discharged from the membrane module is still as high as 4.8 - 5.8 MPa. If calculated according to the usual recovery rate of 40%, there is still 60% of the feed pressure energy in the concentrated seawater, which has great recovery value and significance.

[0003] Traditional seawater desalination uses a high-pressure reverse osmosis process to prepare fresh water. A considerable part of the energy is wasted when the high-pressure concentrated water is directly discharged, resulting in generally too high energy consumption. The existing seawater desalination energy recovery devices have complex structures, high precision, high manufacturing costs, resulting in too large overall investment, and low recovery efficiency.

[0004] Therefore, how to provide an energy recovery device and an energy-saving pump that can improve the recovery efficiency of the residual pressure energy and have a simple structure and low manufacturing cost is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an energy recovery device and an energy-saving pump that can improve the recovery efficiency of the residual pressure energy and have a simple structure and low manufacturing cost.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An energy recovery device, comprising:

[0008] A housing, a vertical partition is provided inside the housing, a transverse moving piston rod passes through the vertical partition, first and second pistons are respectively fixed at both ends of the transverse moving piston rod, the space between the vertical partition and the first piston on one side is a first pressure chamber, the space between the vertical partition and the second piston on the other side is a second pressure chamber, the space between the first piston and one side of the inner wall of the housing is a first boosting chamber, and the space between the second piston and the other side of the inner wall of the housing is a second boosting chamber;

[0009] Wherein, the upper end and the lower end of the first pressure chamber are respectively connected with a first high-pressure water inlet pipe and a first low-pressure water outlet pipe. A first high-pressure water inlet valve is arranged on the first high-pressure water inlet pipe, and a first low-pressure water outlet valve is arranged on the first low-pressure water outlet pipe. The upper end and the lower end of the second pressure chamber are respectively connected with a second high-pressure water inlet pipe and a second low-pressure water outlet pipe. A second high-pressure water inlet valve is arranged on the second high-pressure water inlet pipe, and a second low-pressure water outlet valve is arranged on the second low-pressure water outlet pipe;

[0010] The lower end and the upper end of the first booster chamber are respectively connected with a first low-pressure water inlet pipe and a first high-pressure water outlet pipe. The lower end and the upper end of the second booster chamber are respectively connected with a second low-pressure water inlet pipe and a second high-pressure water outlet pipe.

[0011] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses an energy recovery device. When in use, the first high-pressure water inlet valve and the second low-pressure water outlet valve are opened, and the second high-pressure water inlet valve and the first low-pressure water outlet valve are closed. The high-pressure concentrated water enters the first pressure chamber through the first high-pressure water inlet pipe. The water in the first pressure chamber pushes the first piston to move horizontally to the left, and the water in the first booster chamber is pressurized and discharged through the first high-pressure water outlet pipe for standby. At the same time, the second piston moves horizontally to the left together with the horizontal movement piston rod. At this time, the water in the second pressure chamber is discharged through the second low-pressure water outlet pipe, and the external low-pressure water is sucked into the second booster chamber through the second low-pressure water inlet pipe; then, the second high-pressure water inlet valve and the first low-pressure water outlet valve are opened, and the first high-pressure water inlet valve and the second low-pressure water outlet valve are closed. The high-pressure concentrated water enters the second pressure chamber through the second high-pressure water inlet pipe. The water in the second pressure chamber pushes the second piston to move horizontally to the right, and the water in the second booster chamber is pressurized and discharged through the second high-pressure water outlet pipe for standby. At the same time, the first piston moves horizontally to the right together with the horizontal movement piston rod. At this time, the water in the first pressure chamber is discharged through the first low-pressure water outlet pipe, and the external low-pressure water is sucked into the first booster chamber through the first low-pressure water inlet pipe. The above actions are reciprocally and alternately operated, so that the residual pressure energy of the high-pressure concentrated water can be used to pressurize the low-pressure water to make it become high-pressure water for standby.

[0012] Therefore, this energy recovery device only uses the reciprocating movement of the horizontal movement piston rod and the alternately opening and closing of relevant valves to realize the recovery and utilization of the residual pressure energy of the high-pressure concentrated water. Its structure is not only simple and has a low manufacturing cost, but also improves the recovery efficiency of the residual pressure energy of the high-pressure concentrated water, and reduces the water production energy consumption and water production cost of reverse osmosis seawater desalination.

[0013] A first travel switch and a second travel switch are respectively arranged in the first pressurizing chamber and the second pressurizing chamber; when the first piston contacts the first travel switch, the second high-pressure water inlet valve and the first low-pressure water outlet valve are both in an open state, and the first high-pressure water inlet valve and the second low-pressure water outlet valve are both in a closed state; when the second piston contacts the second travel switch, the first high-pressure water inlet valve and the second low-pressure water outlet valve are both in an open state, and the second high-pressure water inlet valve and the first low-pressure water outlet valve are both in a closed state.

[0014] The beneficial effects of adopting the above technical solution are as follows: the automatic switching of the opening and closing of the corresponding valves can be realized through the first travel switch and the second travel switch, and then the automatic reciprocating cyclic pressurization of the device can be realized. In addition, the opening and closing of the above valves can also be controlled by timing, and the automatic switching function of the valves can also be realized.

[0015] Further, a first water inlet check valve for allowing low-pressure water to enter the first pressurizing chamber unidirectionally is arranged on the first low-pressure water inlet pipe, a second water inlet check valve for allowing low-pressure water to enter the second pressurizing chamber unidirectionally is arranged on the second low-pressure water inlet pipe, a first water outlet check valve for discharging the water in the first pressurizing chamber unidirectionally is arranged on the first high-pressure water outlet pipe, and a second water outlet check valve for discharging the water in the second pressurizing chamber unidirectionally is arranged on the second high-pressure water outlet pipe.

[0016] The beneficial effects of adopting the above technical solution are as follows: through the arrangement of the corresponding check valves, it is ensured that the low-pressure water in the low-pressure water inlet pipe can only enter the pressurizing chamber, and the water pressurized in the pressurizing chamber can only be discharged through the high-pressure water outlet pipe, realizing the unidirectional entry and unidirectional discharge of the water in the pressurizing chamber and avoiding water backflow.

[0017] Further, both the first low-pressure water inlet pipe and the second low-pressure water inlet pipe are connected to a low-pressure water inlet main pipe, and both the first high-pressure water outlet pipe and the second high-pressure water outlet pipe are connected to a high-pressure water outlet main pipe.

[0018] The beneficial effects of adopting the above technical solution are as follows: the device realizes two-way water inlet through the low-pressure water inlet main pipe and one-way water outlet through the high-pressure water outlet main pipe, which can simplify the pipeline layout.

[0019] Further, both the first high-pressure water inlet pipe and the second high-pressure water inlet pipe are connected to a high-pressure water inlet main pipe, and both the first low-pressure water outlet pipe and the second low-pressure water outlet pipe are connected to a low-pressure water outlet main pipe.

[0020] The beneficial effects of adopting the above technical solution are as follows: the device realizes two-way water inlet through the high-pressure water inlet and one-way water outlet through the low-pressure water outlet main pipe, which can simplify the pipeline layout.

[0021] The present invention provides an energy-saving pump, including:

[0022] The energy recovery device;

[0023] A pump body, wherein the water inlet of the pump body is connected to the first high-pressure water outlet pipe and the second high-pressure water outlet pipe, the water outlet of the pump body is connected to the water inlet of the load, and the high-pressure concentrated water outlet of the load is connected to the first high-pressure water inlet pipe and the second high-pressure water inlet pipe.

[0024] The beneficial effect of adopting the above technical scheme is: the present invention utilizes the residual pressure water discharged by the load through the energy recovery device to pressurize the low-pressure water for use by the pump body, thereby realizing the recovery and utilization of the residual pressure potential energy of the concentrated water or return water, so that a low-power pump body can be configured to achieve the purpose of reducing energy consumption and saving energy.

[0025] Furthermore, the first high-pressure water outlet pipe and the second high-pressure water outlet pipe are both connected to a high-pressure water outlet main pipe, the water inlet of the pump body is connected to the high-pressure water outlet main pipe, the first high-pressure water inlet pipe and the second high-pressure water inlet pipe are both connected to a high-pressure water inlet main pipe, and the concentrated water outlet of the load is connected to the high-pressure water inlet main pipe.

[0026] Furthermore, the water inlet of the pump body is also connected to a third low-pressure water inlet pipe.

[0027] The beneficial effect of adopting the above technical solution is that the high-pressure water outlet main pipe and the third low-pressure water inlet pipe can provide water to the pump body at the same time to ensure the pump body flow rate.

[0028] Furthermore, the high-pressure water outlet main pipe is provided with a first water inlet valve, and the third low-pressure water inlet pipe is provided with a second water inlet valve.

[0029] The beneficial effect of adopting the above technical solution is that the high-pressure water outlet main pipe and / or the third low-pressure water inlet pipe can be selected to supply water to the pump body according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0031] Figure 1 A schematic structural diagram of an energy recovery device and an energy-saving pump provided by the present invention. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] As Figure 1 shown, an energy recovery device is disclosed in an embodiment of the present invention, including:

[0034] A housing 1, in which a vertical partition 2 is provided. A transverse movement piston rod 3 passes through the vertical partition 2. At both ends of the transverse movement piston rod 3, a first piston 4 (or diaphragm) and a second piston 5 (or diaphragm) are respectively fixed. Both the first piston 4 and the second piston 5 are in sealed sliding contact with the interior of the housing 1. The space between the vertical partition 2 and the first piston 4 on one side is a first pressure chamber 101, and the space between the vertical partition 2 and the second piston 5 on the other side is a second pressure chamber 102. The space between the first piston 4 and one side of the inner wall of the housing 1 is a first boosting chamber 103, and the space between the second piston 5 and the other side of the inner wall of the housing 1 is a second boosting chamber 104;

[0035] Among them, the upper end and the lower end of the first pressure chamber 101 are respectively connected to a first high-pressure water inlet pipe 6 and a first low-pressure water outlet pipe 7. A first high-pressure water inlet valve 8 is provided on the first high-pressure water inlet pipe 6, and a first low-pressure water outlet valve 9 is provided on the first low-pressure water outlet pipe 7. The upper end and the lower end of the second pressure chamber 102 are respectively connected to a second high-pressure water inlet pipe 10 and a second low-pressure water outlet pipe 11. A second high-pressure water inlet valve 12 is provided on the second high-pressure water inlet pipe 10, and a second low-pressure water outlet valve 13 is provided on the second low-pressure water outlet pipe 11;

[0036] The lower end and the upper end of the first boosting chamber 103 are respectively connected to a first low-pressure water inlet pipe 14 and a first high-pressure water outlet pipe 15. The lower end and the upper end of the second boosting chamber 104 are respectively connected to a second low-pressure water inlet pipe 16 and a second high-pressure water outlet pipe 17.

[0037] In some embodiments, a first travel switch 30 and a second travel switch 31 are respectively provided in the first boosting chamber 103 and the second boosting chamber 104; when the first piston 4 contacts the first travel switch 30, both the second high-pressure water inlet valve 12 and the first low-pressure water outlet valve 9 are in an open state, and both the first high-pressure water inlet valve 8 and the second low-pressure water outlet valve 13 are in a closed state; when the second piston 5 contacts the second travel switch 31, both the first high-pressure water inlet valve 8 and the second low-pressure water outlet valve 13 are in an open state, and both the second high-pressure water inlet valve 12 and the first low-pressure water outlet valve 9 are in a closed state.

[0038] In some embodiments, a first water inlet check valve 18 for allowing low-pressure water to enter the first pressurizing chamber 103 unidirectionally is provided on the first low-pressure water inlet pipe 14, a second water inlet check valve 19 for allowing low-pressure water to enter the second pressurizing chamber 104 unidirectionally is provided on the second low-pressure water inlet pipe 16, a first water outlet check valve 20 for allowing the water in the first pressurizing chamber 103 to be discharged unidirectionally is provided on the first high-pressure water outlet pipe 15, and a second water outlet check valve 21 for allowing the water in the second pressurizing chamber 104 to be discharged unidirectionally is provided on the second high-pressure water outlet pipe 17.

[0039] Both the first low-pressure water inlet pipe 14 and the second low-pressure water inlet pipe 16 are connected to a low-pressure water inlet main pipe 22, and both the first high-pressure water outlet pipe 15 and the second high-pressure water outlet pipe 17 are connected to a high-pressure water outlet main pipe 23.

[0040] Both the first high-pressure water inlet pipe 6 and the second high-pressure water inlet pipe 10 are connected to a high-pressure water inlet main pipe 24, and both the first low-pressure water outlet pipe 7 and the second low-pressure water outlet pipe 11 are connected to a low-pressure water outlet main pipe 25.

[0041] An embodiment of an energy-saving pump provided by the present invention includes:

[0042] An energy recovery device;

[0043] A pump body 26, the water inlet of the pump body 26 is connected to both the first high-pressure water outlet pipe 15 and the second high-pressure water outlet pipe 17, the water outlet of the pump body 26 is connected to the water inlet of a load 100, and the high-pressure concentrated water outlet of the load 100 is connected to both the first high-pressure water inlet pipe 6 and the second high-pressure water inlet pipe 10.

[0044] Both the first high-pressure water outlet pipe 15 and the second high-pressure water outlet pipe 17 are connected to a high-pressure water outlet main pipe 23, the water inlet of the pump body 26 is connected to the high-pressure water outlet main pipe 23, both the first high-pressure water inlet pipe 6 and the second high-pressure water inlet pipe 10 are connected to a high-pressure water inlet main pipe 24, and the concentrated water outlet of the load 100 communicates with the high-pressure water inlet main pipe 24.

[0045] The water inlet of the pump body 26 is further connected to a third low-pressure water inlet pipe 27.

[0046] A first water inlet valve 28 is provided on the high-pressure water outlet main pipe 23, and a second water inlet valve 29 is provided on the third low-pressure water inlet pipe 27.

[0047] In use, open the first high-pressure inlet valve and the second low-pressure outlet valve, and close the second high-pressure inlet valve and the first low-pressure outlet valve. The high-pressure concentrated water discharged from the load (such as the concentrated water of the reverse osmosis membrane device for seawater desalination or the return water of the circulating cooling water system) enters the first pressure chamber through the first high-pressure inlet pipe. The water in the first pressure chamber pushes the first piston to move horizontally to the left, pressurizes the water in the first booster chamber, and discharges it through the first high-pressure outlet pipe to supply high-pressure water to the pump body. The high-pressure water output from the pump body enters the load to achieve seawater desalination. At the same time, the second piston moves to the left together with the transverse movement piston rod. At this time, the water in the second pressure chamber is discharged through the second low-pressure outlet pipe, and the low-pressure water outside, such as low-pressure seawater or the water used in the circulating cooling water system, is sucked into the second booster chamber through the second low-pressure inlet pipe; then, open the second high-pressure inlet valve and the first low-pressure outlet valve, close the first high-pressure inlet valve and the second low-pressure outlet valve. The high-pressure concentrated water enters the second pressure chamber through the second high-pressure inlet pipe. The water in the second pressure chamber pushes the second piston to move horizontally to the right, pressurizes the water in the second booster chamber, and discharges it through the second high-pressure outlet pipe to supply high-pressure water to the pump body. The high-pressure water output from the pump body enters the load to achieve seawater desalination. At the same time, the first piston moves to the right together with the transverse movement piston rod. At this time, the water in the first pressure chamber is discharged through the first low-pressure outlet pipe, and the low-pressure water outside, such as low-pressure seawater or the water used in the circulating cooling water system, is sucked into the first booster chamber through the first low-pressure inlet pipe. The above actions run alternately, and thus the residual pressure energy of the high-pressure concentrated water discharged from the load can be used to pressurize the low-pressure seawater to make it become high-pressure water for utilization.

[0048] This energy recovery device only utilizes the reciprocating movement of the transverse movement piston rod and the alternating opening and closing of the relevant valves to realize the recovery and utilization of the residual pressure energy of the high-pressure concentrated water. Its structure is not only simple and has a low manufacturing cost, but also improves the recovery efficiency of the residual pressure energy of the high-pressure concentrated water, reduces the water production energy consumption and water production cost of reverse osmosis seawater desalination.

[0049] Of course, the energy recovery device of the present invention can also be applied to other occasions where the energy of high-pressure water needs to be recovered. For example, the energy recovery device can be applied to a circulating cooling water system, etc., to recover the energy of the high-pressure water output of the cooling tower in the cooling water system.

[0050] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same and similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For the relevant parts, reference can be made to the description in the method part.

[0051] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy recovery device, characterized in that, Comprising: A housing (1), within which a vertical partition (2) is provided. A transverse movement piston rod (3) passes through the vertical partition (2). At both ends of the transverse movement piston rod (3), a first piston (4) and a second piston (5) are respectively fixed. The space between the vertical partition (2) and the first piston (4) on one side is a first pressure chamber (101), the space between the vertical partition (2) and the second piston (5) on the other side is a second pressure chamber (102), the space between the first piston (4) and the inner wall of the housing (1) on one side is a first boosting chamber (103), and the space between the second piston (5) and the inner wall of the housing (1) on the other side is a second boosting chamber (104); Wherein, the upper end and the lower end of the first pressure chamber (101) are respectively connected to a first high-pressure water inlet pipe (6) and a first low-pressure water outlet pipe (7). A first high-pressure water inlet valve (8) is provided on the first high-pressure water inlet pipe (6), and a first low-pressure water outlet valve (9) is provided on the first low-pressure water outlet pipe (7). The upper end and the lower end of the second pressure chamber (102) are respectively connected to a second high-pressure water inlet pipe (10) and a second low-pressure water outlet pipe (11). A second high-pressure water inlet valve (12) is provided on the second high-pressure water inlet pipe (10), and a second low-pressure water outlet valve (13) is provided on the second low-pressure water outlet pipe (11); The lower end and the upper end of the first boosting chamber (103) are respectively connected to a first low-pressure water inlet pipe (14) and a first high-pressure water outlet pipe (15). The lower end and the upper end of the second boosting chamber (104) are respectively connected to a second low-pressure water inlet pipe (16) and a second high-pressure water outlet pipe (17).

2. The energy recovery device according to claim 1, wherein A first travel switch (30) and a second travel switch (31) are respectively provided in the first boosting chamber (103) and the second boosting chamber (104); when the first piston (4) contacts the first travel switch (30), the second high-pressure water inlet valve (12) and the first low-pressure water outlet valve (9) are both in an open state, and the first high-pressure water inlet valve (8) and the second low-pressure water outlet valve (13) are both in a closed state; when the second piston (5) contacts the second travel switch (31), the first high-pressure water inlet valve (8) and the second low-pressure water outlet valve (13) are both in an open state, and the second high-pressure water inlet valve (12) and the first low-pressure water outlet valve (9) are both in a closed state.

3. An energy recovery device according to claim 1 or 2, characterized in that, A first inlet check valve (18) for allowing low-pressure water to enter the first boosting chamber (103) unidirectionally is provided on the first low-pressure water inlet pipe (14), a second inlet check valve (19) for allowing low-pressure water to enter the second boosting chamber (104) unidirectionally is provided on the second low-pressure water inlet pipe (16), a first outlet check valve (20) for discharging the water in the first boosting chamber (103) unidirectionally is provided on the first high-pressure water outlet pipe (15), and a second outlet check valve (21) for discharging the water in the second boosting chamber (104) unidirectionally is provided on the second high-pressure water outlet pipe (17).

4. An energy recovery device according to claim 1 or 2, characterized in that, Both the first low-pressure water inlet pipe (14) and the second low-pressure water inlet pipe (16) are connected to a low-pressure water inlet main pipe (22), and both the first high-pressure water outlet pipe (15) and the second high-pressure water outlet pipe (17) are connected to a high-pressure water outlet main pipe (23).

5. An energy recovery device according to claim 1 or 2, characterized in that, Both the first high-pressure water inlet pipe (6) and the second high-pressure water inlet pipe (10) are connected to a high-pressure water inlet main pipe (24), and both the first low-pressure water outlet pipe (7) and the second low-pressure water outlet pipe (11) are connected to a low-pressure water outlet main pipe (25).

6. An energy-saving pump, characterized in that, Comprising: The energy recovery device according to any one of claims 1-5; A pump body (26), the water inlet of the pump body (26) is connected to both the first high-pressure water outlet pipe (15) and the second high-pressure water outlet pipe (17), the water outlet of the pump body (26) is connected to the water inlet of a load (100), and the high-pressure concentrated water outlet of the load (100) is connected to both the first high-pressure water inlet pipe (6) and the second high-pressure water inlet pipe (10).

7. An energy-saving pump according to claim 6, characterized in that, Both the first high-pressure water outlet pipe (15) and the second high-pressure water outlet pipe (17) are connected to a high-pressure water outlet main pipe (23), the water inlet of the pump body (26) is connected to the high-pressure water outlet main pipe (23), both the first high-pressure water inlet pipe (6) and the second high-pressure water inlet pipe (10) are connected to a high-pressure water inlet main pipe (24), and the concentrated water outlet of the load (100) communicates with the high-pressure water inlet main pipe (24).

8. An energy-saving pump according to claim 7, characterized in that, The water inlet of the pump body (26) is further connected to a third low-pressure water inlet pipe (27).

9. An energy-saving pump according to claim 8, characterized in that, A first water inlet valve (28) is provided on the high-pressure water outlet main pipe (23), and a second water inlet valve (29) is provided on the third low-pressure water inlet pipe (27).

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