CN216726666U

CN216726666U - Reverse osmosis energy recovery device

Info

Publication number: CN216726666U
Application number: CN202120726363.9U
Authority: CN
Inventors: 赵序良
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-10
Filing date: 2021-04-10
Publication date: 2022-06-14
Anticipated expiration: 2031-04-10

Abstract

The utility model belongs to the technical field of energy-concerving and environment-protective, particularly, relate to a reverse osmosis energy recovery device of merit exchange formula. The device is based on a power exchange type energy recovery principle, but is different from the GB/T30299-2013 standard in that the device transfers the hydraulic energy of the concentrated brine to raw water through a diaphragm or an inner container instead of a piston or direct contact, through one-step energy conversion, so that the energy conversion efficiency is equivalent to that of direct contact, but the mixing degree of the device tends to zero. The pressure exchange tank adopted by the device has a simple structure, and the requirements on manufacturing materials and processing precision are low, so that the production and operation cost is low, and the popularization is facilitated.

Description

Reverse osmosis energy recovery device

Technical Field

The utility model belongs to the technical field of energy-concerving and environment-protective, particularly, relate to a reverse osmosis energy recovery device of merit exchange formula.

Background

With the wide application of reverse osmosis technology in production and life, especially the preparation of industrial desalted water, the phenomena of high reverse osmosis energy consumption and concentrated water discharge waste are increasingly prominent. As is well known, the high-pressure concentrated water discharged by reverse osmosis accounts for more than 25% of the total water inflow, which also means that more than 25% of the energy of the high-pressure pump of the system is wasted.

The reverse osmosis energy recovery device applied in China at present is divided into two categories of a hydraulic turbine type and a power exchange type according to the principle, the hydraulic turbine type recovery rate is low, and the power exchange type recovery rate is over 90 percent. No matter the water turbine type or the work exchange type, the device is mainly used for a reverse osmosis device for desalting seawater and brackish water at present, and the application degree is very low compared with the whole reverse osmosis market.

For a power exchange type recovery device, the general technical specification (GB/T30299-2003) of reverse osmosis energy recovery devices sets and requires the classification and model, requirements, test methods, inspection rules, product performance, and the like of the devices. According to the standard, there are currently two types of products. The utility model provides a there is piston, piston cylinder, and is very high to the preparation material, machining precision requirement, and has the problem that dynamic seal rubs and hinders, dynamic seal rubs and decreases, reveal in the operation process, has certain influence to effective energy conversion efficiency, device mixedness. And the other direct contact type pressure exchange without a piston has 5-6% salt content change of concentrated water or raw water in the pressure exchange process due to the large mixing degree of the device. If the operation parameters are not properly adjusted, the water inlet salinity of the reverse osmosis device is seriously increased, the service life of the membrane is influenced, and the quality of the discharged water is stable.

The reverse osmosis desalination device which is most widely applied in the current industrial production mostly adopts a fresh water source, the operating pressure is far lower than that of a seawater and brackish water desalination reverse osmosis device, and the operating pressure is usually 0.8-1.5 MPa. For the reverse osmosis device, if an energy recovery device is configured according to the standard of the seawater and brackish water desalination reverse osmosis device, the problems of high investment cost, relatively low income and long investment recovery period exist. Therefore, there are few cases in the market where conventional pressure reverse osmosis devices are equipped with energy recovery devices. However, since the market share of the conventional pressure reverse osmosis apparatus is high, and energy waste is actually serious, it is necessary to develop a low-cost energy recovery apparatus, and to perform energy recovery widely to reduce such energy waste.

Disclosure of Invention

To the above problem that exists, the utility model provides a reverse osmosis energy recovery device. The device is based on a power exchange type energy recovery principle, but is different from the GB/T30299-2013 standard in that the hydraulic energy of the concentrated brine is transferred to raw water through a diaphragm or an inner container instead of being transferred to the raw water through a piston or direct contact through one-step energy conversion, so that the energy conversion efficiency is equivalent to that of the direct contact type, but the mixing degree of the device can approach to zero. The pressure exchange tank adopted by the device has the advantages of simple structure, low requirements on manufacturing materials and processing precision, low production and operation cost and contribution to popularization and promotion.

Specifically speaking, the utility model discloses a following technical scheme realizes:

a reverse osmosis energy recovery device comprising: the system comprises a pressure exchange tank 1, a first pressure exchange tank group 2, a second pressure exchange tank group 3, a first reversing valve 4, a second reversing valve 5, a first flow sensor 61, a second flow sensor 62, a controller 7, a booster pump 8, a surge tank 9, a pressure relief valve 18 and a reverse osmosis system 10.

The first pressure exchange tank group 2 and the second pressure exchange tank group 3 are formed by connecting pressure exchange tanks 1 which are provided with diaphragms or inner gall bladders in the same structure, specification and quantity in parallel, and are connected with a reverse osmosis system 10 through a first reversing valve 4 and a second reversing valve 5.

The controller 7 controls the synchronous switching of the first reversing valve 4 and the second reversing valve 5 and the operation of the booster pump 8, so that high-pressure concentrated water and low-pressure raw water are continuously and alternately subjected to pressure exchange through the two pressure exchange tank groups, and the booster pump 8 outputs the high-pressure raw water to the reverse osmosis system 10 to complete the energy recovery process.

The controller 7 respectively accumulates the low-pressure raw water input flow and the high-pressure raw water output flow of the first flow sensor 61 and the second flow sensor 62, and when the two accumulated flows reach a set switching value to trigger automatic switching or manual switching is performed through the controller, the first reversing valve 4 and the second reversing valve 5 are controlled to complete switching, and the two accumulated flows return to zero and are accumulated again.

The first flow sensor 61 is positioned at any suitable position of a connecting pipeline between the water inlet 51 of the second reversing valve and the outlet 107 of the reverse osmosis cartridge filter; the second flow sensor 62 is positioned at any suitable position of the connecting pipeline between the water outlet 52 of the second switching valve and the water inlet 106 of the reverse osmosis device.

The reverse osmosis system 10 is equipped with a frequency converter for the regulation and control of the high-pressure pump 103.

The first water inlet and outlet 21 of the first pressure exchange tank group 2 and the third water inlet and outlet 31 of the second pressure exchange tank group 3 are respectively connected with the first normal open port 43 and the second normal open port 44 of the first reversing valve 4, and the first reversing valve water inlet 41 and the concentrated water discharge port 42 are respectively connected with the reverse osmosis high-pressure concentrated water discharge port 105 and the concentrated water discharge pipeline 45.

The water inlet and outlet two 22 of the first pressure exchange tank group 2 and the water inlet and outlet four 32 of the second pressure exchange tank group 3 are respectively connected with the normal open port three 53 and the normal open port four 54 of the second reversing valve 5, the water inlet 51 and the water outlet 52 of the second reversing valve 5 are respectively connected with the reverse osmosis cartridge filter outlet 107 and the booster pump inlet 81, and the booster pump outlet 82 is connected with the reverse osmosis device water inlet 106.

The pressure exchange tank 1 is provided with a first water inlet and outlet 12 and a second water inlet and outlet 13, and the interior of the pressure exchange tank is divided into a first cavity 16 and a second cavity 17 by a diaphragm or an inner bag 11; the first cavity 16 is communicated with the second water inlet and outlet 13, the second cavity 17 is communicated with the first water inlet and outlet 12, and the first cavity 16 and the second cavity 17 are respectively provided with a first exhaust port 15 and a second exhaust port 14; and the first exhaust port 15 and the second exhaust port 14 are provided with exhaust devices.

The diaphragm or bladder 11 operates in a non-inflated state.

The controller 7 resets the initialized default control state to a first state, the first pressure exchange tank group 2 is in a pressure exchange mode of inputting high-pressure concentrated water and outputting high-pressure raw water in the first state, and the second pressure exchange tank group 3 is in a recovery standby mode of inputting low-pressure raw water and discharging low-pressure concentrated water; the control state of the controller 7 can be switched manually by the controller or automatically switched to a second state after setting an accumulated flow switching value, the second pressure exchange tank group 3 is in a pressure exchange mode of inputting high-pressure concentrated water and outputting high-pressure raw water in the second state, and the first pressure exchange tank group 2 is in a recovery standby mode of inputting low-pressure raw water and discharging low-pressure concentrated water.

After the controller 7 is reset and initialized, the accumulated flow switching value parameter is cleared, and the default control mode is manual control through the controller 7; the controller is in an automatic switching state after setting an accumulated flow switching set value; and the controller 7 is powered on again after power failure to keep the control state before power failure.

The controller 7 further comprises a frequency converter 71, the frequency converter 71 is used for starting the booster pump 8 and adjusting the flow working condition, and the automatic start-stop signal of the frequency converter 71 is from the high-pressure pump start-stop signal of the reverse osmosis system 10.

The pressure stabilizing tank 9 and the pressure relief valve 18 are connected with a high-pressure concentrated water discharge port 105.

The utility model discloses a characteristics and useful part lie in:

(1) two groups of pressure exchange tanks with built-in diaphragms or internal gallbladders are adopted to replace piston type or direct contact type pressure exchangers, and compared with piston type power exchange type pressure exchangers, the piston type power exchange type pressure exchanger has the advantages that leakage and friction loss existing in the dynamic seal of the piston are avoided, and the processing and manufacturing cost is low; nearly zero plant mixedness with nearly identical energy recovery efficiency compared to direct contact pressure exchangers;

(2) the diaphragm or the inner bag of the pressure exchange tank works in a non-expansion state, the service life of the pressure exchange tank is greatly prolonged, the selection of materials of the pressure exchange tank is wider, and the production cost and the running loss of the whole device are relatively lower;

(3) two flow sensor flow signals are adopted, when the two flow signal accumulated values reach a set value, the two flow signal accumulated values are used as signals for controlling the action of a switching valve by a controller, the set value adopts a flow accumulated value taking the actual exchange volume of a pressure exchange tank group as a reference, the water inlet and outlet flow of the control device meets the condition that a first flow sensor 61 flow value is larger than or equal to a second flow sensor 62 flow value, and the stability and the continuity of the precise control and the operation of the device are guaranteed;

(4) the high-pressure concentrated water discharge port 105 is connected with the pressure stabilizing tank 9 and the pressure relief valve 18, so that the influence of valve control switching on water pressure fluctuation is reduced, and the pressure relief valve can be used for special and unexpected conditions, such as high-pressure concentrated water discharge under the conditions of mismatching of water inlet and outlet flows of the energy recovery device, failure of the switching valve and the like, so that the influence of high-pressure protection of a reverse osmosis system on the operation of the reverse osmosis device is avoided.

Drawings

The first figure is a schematic diagram of the energy recovery device; the dotted line frame part is an integral functional block which is logically divided and consists of specific entity components; the dotted lines indicate the presence of electrical and instrumentation connections and relationships between the interconnected objects.

And the second diagram is a structural schematic diagram of the pressure exchange tank.

The reference numerals are explained below:

1-a pressure exchange tank; 11-septum or internal gallbladder; 12-a first inlet/outlet; 13-second inlet/outlet; 14-exhaust port two; 15-exhaust port one; 16-cavity one; 17-cavity two;

2-a first pressure exchange tank group; 21-inlet and outlet I; 22-inlet outlet II;

3-a second pressure exchange tank group; 31-inlet outlet III; 32-inlet and outlet four;

4-a first reversing valve; 41-a first reversing valve water inlet; 411-concentrated water switching port one; 412-concentrated water switching port two; 42-concentrated water discharge port; 421-concentrated water switching port three; 422-concentrated water switching port IV; 43-normally open port one; 44-normal open port two; 45-concentrated water discharge pipeline;

5-a second reversing valve; 51-a second reversing valve water inlet; 511-raw water switching port I; 512-raw water switching port two; 52-water outlet of second reversing valve; 521-raw water switching port III; 522-raw water switching port four; 53-normal open port three; 54-normal open port four;

61-flow sensor one; 62-flow sensor two; 7-a controller; 71-frequency converter;

8, a booster pump; 81-inlet of booster pump; 82-a booster pump outlet; 9-pressure stabilizing tank; 18-a pressure relief valve;

10-reverse osmosis system; 101-raw water pump; 102-a cartridge filter; 103-a high pressure pump; 104 a reverse osmosis unit; 105-high-pressure concentrated water discharge port of reverse osmosis device; 106-water inlet of reverse osmosis unit; 107-outlet of cartridge filter.

Detailed Description

As shown in the figure, the connection point of the reverse osmosis system and the energy recovery device comprises a high-pressure concentrated water discharge outlet 105, a reverse osmosis device water inlet 106 and a cartridge filter outlet 107.

Wherein: the high-pressure concentrated water discharge port 105 is respectively connected with the water inlet 41 of the first reversing valve, the inlet of the pressure relief valve 18 and the water inlet and outlet of the pressure stabilizing tank 9; the water inlet 106 of the reverse osmosis device is connected with the outlet 82 of the booster pump 8, and the inlet 81 of the booster pump 8 is connected with the water outlet 52 of the second reversing valve through the flow sensor 62; the canister filter outlet 107 is connected to the second diverter valve inlet 51 via the flow sensor 61.

In this embodiment, the first direction valve 4 and the second direction valve 5 are formed by combining two three-way valves, wherein: the first concentrated water switching port 411 and the second concentrated water switching port 412 are connected in parallel to form a first reversing valve water inlet 41; the third concentrated water switching port 421 and the fourth concentrated water switching port 422 are connected in parallel to form a concentrated water discharge port 42; the first raw water switching port 511 and the second raw water switching port 512 are connected in parallel to form a second reversing valve water inlet 51; the raw water switching port III 521 and the raw water switching port IV 522 are connected in parallel to form a water outlet 52 of the second reversing valve; the other valve ports are respectively as follows: a first normal opening 43, a second normal opening 44, a third normal opening 53 and a fourth normal opening 54.

The first direction valve 4 and the second direction valve 5 are not limited to a three-way valve combination, and may be two-position five-way direction valves or others.

The first reversing valve 4 and the second reversing valve 5 are in charge of water inlet and outlet switching of the first pressure exchange tank group 2 and the second pressure exchange tank group 3 under the control of the controller 7.

When the first pressure exchange tank group 2 is in a pressure exchange mode of inputting high-pressure concentrated water and outputting high-pressure raw water, and the second pressure exchange tank group 3 is in a recovery standby mode of inputting low-pressure raw water and discharging low-pressure concentrated water, the first state of the controller 7 is called.

When the second pressure exchange tank group 3 is in a pressure exchange mode of inputting high-pressure concentrated water and outputting high-pressure raw water, and the first pressure exchange tank group 2 is in a recovery standby mode of inputting low-pressure raw water and discharging low-pressure concentrated water, the state is called as a second state of the controller 7.

When the controller 7 is reset and initialized, the default control state is the first state; the state can be switched manually through the controller 7, or automatically after setting the accumulated flow switching value; the controller 7 is powered on again after power failure, and the control state before power failure is kept.

The specific states of the valve ports of the first reversing valve 4 and the second reversing valve 5 in the two control states are shown in the following table.

As described in the above table, in this embodiment, there is a relationship similar to electrical interlock between the switching ports of the same three-way valve and between two valve ports connected in parallel, that is, you make or break.

Besides ensuring that the valve ports are kept in a state similar to the interlocking state of an electric appliance, the controller also has the functions of accumulating flow, controlling the automatic switching of the reversing valve and controlling the automatic operation of the booster pump through the frequency converter.

As shown in the figure I, after a frequency converter 71 of the device is provided with a reverse osmosis system high-pressure pump 103 start-stop signal to automatically start and stop the booster pump 8, the booster pump 8 is automatically started and stopped along with the start and stop of the high-pressure pump; the high-pressure raw water output by the device and the input low-pressure raw water are respectively measured by a flow sensor II 62 and a flow sensor I61 and are sent to the controller 7 for accumulation; when the two accumulated flows reach the set value, the controller 7 controls the first reversing valve 4 and the second reversing valve 5 to complete the switching of the working states of the two pressure exchange tank groups, and simultaneously, the accumulated flows return to zero and the metering control of the next period is started; the operation of the whole device is ensured to be automatic, continuous and stable by such alternation and repetition.

The working process of the device in the automatic operation and automatic switching mode is described above; the conditions of this mode are that the controller 7 sets an accumulated flow switching set value, and the frequency converter 71 sets a high-pressure pump start-stop signal as a frequency converter start-stop signal; when the controller 7 needs to reset the accumulated flow set value, the accumulated flow set value can be reset after being cleared through reset initialization; meanwhile, the manual switching mode in the state is initialized, and the work of calibrating the volume calibration, checking and testing the state of the reversing valve and the like can be finished. And when the controller is powered off and powered on again, the control state before the power off is kept.

Under the combined action of the controller 7, the first reversing valve 4, the second reversing valve 5 and the booster pump 8, reverse osmosis high-pressure concentrated water continuously and alternately transfers exchange energy with low-pressure raw water through the first pressure exchange tank group 2 and the second pressure exchange tank group 3, the high-pressure raw water is continuously output to a water inlet 106 of the reverse osmosis device through the booster pump 8, and meanwhile, the low-pressure raw water from an outlet 107 of the cartridge filter is filled into a pressure exchange tank group in a non-pressure exchange state to discharge the low-pressure concentrated water; the flow regulation in the process, or the concentrated water flow regulation in the running process of the reverse osmosis system, is realized by regulating and controlling the booster pump through the frequency converter 71.

The high-pressure raw water pressurized by the pressure exchange tank group and the booster pump and the high-pressure pump water of the reverse osmosis system supply water to the reverse osmosis device together, which exceeds the water inlet requirement of the reverse osmosis device; therefore, the output flow of the high-pressure pump of the reverse osmosis system is correspondingly reduced; the output flow of the original high-pressure pump is reduced through the regulation of a frequency converter, or the high-pressure pump is selected and matched again; preferably, a variable frequency adjusting mode with a wide adjusting range is adopted.

In practical application, a high-pressure pump of a small and medium-sized reverse osmosis system is not provided with a frequency converter, and for energy recovery and energy-saving transformation of the system, the frequency converter is added to the high-pressure pump for adjustment, so that the high-pressure pump is an optimal adjustment mode, and can be replaced by a variable-frequency motor according to the situation.

In order to reduce the fluctuation influence of the valve control switching process on the concentrated water pressure of the reverse osmosis device, a buffer tank 9 and a pressure release valve 18 are connected to a high-pressure concentrated water discharge port 105 of the reverse osmosis device, and a discharge port of the pressure release valve 18 is connected with a concentrated water discharge pipeline 45; when the controller or the reversing valve breaks down suddenly, high-pressure concentrated water can be discharged temporarily through the pressure release valve 18, and the high-pressure protection shutdown of the reverse osmosis device is avoided.

The energy recovery process, automatic switching and automatic control process of the embodiment are described above, and the pressure exchange energy recovery unit of the device is further described below.

As shown in the figure I, the first pressure exchange tank group 2 and the second pressure exchange tank group 3 are formed by connecting pressure exchange tanks 1 with built-in diaphragms or internal gallbladders in the same structure, specification and quantity in parallel, and form a pressure exchange energy recovery unit of the device. The tank group exchange capacities of the two tank groups are required to be ensured to be consistent; when the capacity is changed due to some reason, the number of the exchange tanks in the tank group is correspondingly increased or decreased, and the capacity matching of the tank group is kept.

The structure of the pressure exchange tank 1 is shown in fig. two.

Preferably, the diaphragm or the inner bag 11 is fixed on the flange port through the bag port, and the flange covers of the upper and lower flange ports are respectively provided with a first water inlet and outlet 12 and a second water inlet and outlet 13; the upper flange cover is provided with a second air outlet 14, the upper part of the tank body is provided with a first air outlet 15, and the automatic air exhausting device is arranged on the air outlet and used for automatically exhausting air in the second cavity 17 and the first cavity 16.

The interior of the pressure exchange tank 1 is divided into a first cavity 16 and a second cavity 17 by an inner container bag 11; the first cavity 16 and the second cavity 17 are filled with raw water and concentrated water respectively, when high-pressure concentrated water enters the second cavity 17 through the first water inlet/outlet 12, the same amount of raw water in the first cavity 16 is discharged from the second water inlet/outlet 13, and the stage is a pressure exchange stage; when low-pressure raw water is filled into the first cavity 16 through the second water inlet/outlet 13, the same amount of concentrated water in the second cavity 17 is discharged, and the stage is a recovery standby stage for discharging the concentrated water by filling the raw water; the two stages are controlled by a reversing valve and are alternately carried out.

The diaphragm or the inner bladder 11 arranged in the pressure exchange tank 1 works in a non-expansion state, and the realization mode comprises the following steps: the shape and the volume of the diaphragm or the inner gallbladder are kept matched with the tank body; cumulative flow rate settings and accurate metering control by the first flow sensor 61, the second flow sensor 62, the controller 7. The diaphragm or the inner gallbladder is limited in a non-expansion state through the measures, so that the service life of the diaphragm or the inner gallbladder is prolonged, and the manufacturing materials are more widely selected.

The existence of the diaphragm or the inner bag 11 completely isolates the high-pressure concentrated water from the raw water, thereby realizing zero mixing degree of the concentrated water and the raw water; the non-expansion working state of the diaphragm or the inner bag 11 has higher efficiency than the piston type pressure exchange mode and is close to direct contact type pressure exchange.

Through switching control of the controller 7, the first reversing valve 4 and the second reversing valve 5, the first pressure exchange tank group 2 and the second pressure exchange tank group 3 alternately operate in a first stage and a second stage respectively, so that the pressure exchange process of the device and the continuity of water inlet and outlet are ensured; because the pressure exchange tanks with the same quantity and specification are adopted to form the tank group, the flexible exchange capacity can be increased and decreased when the individual exchange tank is overhauled, and the operation of the device is not influenced.

The above description is provided for the specific embodiments of the present invention, but the present invention is not limited to the above embodiments; the above embodiments are illustrative only and not limiting; those skilled in the art can make various changes and modifications within the scope of the present invention.

Claims

1. A reverse osmosis energy recovery device, comprising: the system comprises a pressure exchange tank, a first pressure exchange tank group, a second pressure exchange tank group, a first reversing valve, a second reversing valve, a first flow sensor, a second flow sensor, a controller, a booster pump, a pressure stabilizing tank, a pressure relief valve and a reverse osmosis system; the first pressure exchange tank group and the second pressure exchange tank group are formed by connecting pressure exchange tanks with built-in diaphragms or internal gallbladders in the same structure, specification and quantity in parallel and are connected with a reverse osmosis system through a first reversing valve and a second reversing valve; the controller controls the synchronous switching of the first reversing valve and the second reversing valve and the operation of the booster pump, so that high-pressure concentrated water and low-pressure raw water are continuously and alternately subjected to pressure exchange through the first pressure exchange tank group and the second pressure exchange tank group, and the high-pressure raw water is output to the reverse osmosis system through the booster pump to finish the energy recovery process; the controller respectively accumulates the flows of the first flow sensor and the second flow sensor, and when the two accumulated flows reach a switching set value, the controller controls the first reversing valve and the second reversing valve to complete switching, and simultaneously, the two accumulated flows return to zero and are accumulated again; the first flow sensor and the second flow sensor are used for measuring input flow of low-pressure raw water and output flow of high-pressure raw water respectively, the first flow sensor is positioned at any proper position of a connecting pipeline between a water inlet of the second reversing valve and an outlet of the reverse osmosis cartridge filter, and the second flow sensor is positioned at any proper position of a connecting pipeline between a water outlet of the second switching valve and a water inlet of the reverse osmosis device; the high-pressure pump of the reverse osmosis system is provided with a frequency converter.

2. The reverse osmosis energy recovery device of claim 1, wherein the first water inlet and outlet port of the first pressure exchange tank group and the third water inlet and outlet port of the second pressure exchange tank group are respectively connected with the first normal opening port and the second normal opening port of the first reversing valve, and the water inlet port and the concentrated water discharge port of the first reversing valve are respectively connected with the high-pressure concentrated water discharge port and the concentrated water discharge pipeline of the reverse osmosis device; and the water inlet and outlet II of the first pressure exchange tank group and the water inlet and outlet IV of the second pressure exchange tank group are respectively connected with the normally open port III and the normally open port IV of the second reversing valve, the water inlet of the second reversing valve and the water outlet of the second reversing valve are respectively connected with the outlet of the reverse osmosis cartridge filter and the inlet of the booster pump, and the outlet of the booster pump is connected with the water inlet of the reverse osmosis device.

3. A reverse osmosis energy recovery device according to claim 1, wherein the pressure exchange tank is provided with a first water inlet and a second water inlet, and the interior of the pressure exchange tank is divided into a first cavity and a second cavity by a diaphragm or an inner bag; the first cavity is communicated with a second water inlet and outlet, the second cavity is communicated with the first water inlet and outlet, and the first cavity and the second cavity are respectively provided with a first exhaust port and a second exhaust port; and the exhaust device is arranged on the exhaust port I and the exhaust port II.

4. A reverse osmosis energy recovery device according to claim 1 or claim 3, wherein the membrane or bladder is operable in a non-inflated state.

5. The reverse osmosis energy recovery device of claim 1, wherein the controller resets the initialized default control state to a first state in which the first pressure exchange tank set is in a pressure exchange mode of inputting high-pressure concentrated water and outputting high-pressure raw water, and the second pressure exchange tank set is in a recovery standby mode of inputting low-pressure raw water and discharging low-pressure concentrated water; the control state of the controller can be manually switched through the controller or automatically switched into a second state after setting an accumulated flow switching set value, namely the second pressure exchange tank group is in a pressure exchange mode of inputting high-pressure concentrated water and outputting high-pressure raw water, and the first pressure exchange tank group is in a recovery standby mode of inputting low-pressure raw water and discharging low-pressure concentrated water.

6. The reverse osmosis energy recovery device of claim 1 or 5, wherein the controller is reset to initialize, and the accumulated flow switching set value is cleared, and the default control mode is manual switching through the controller; the controller is in an automatic switching state after setting an accumulated flow switching set value; and the controller is powered on again after power failure to keep the control state before power failure.

7. The reverse osmosis energy recovery device of claim 1, wherein the controller further comprises a frequency converter, the frequency converter is used for controlling and adjusting the operation and working conditions of the booster pump, and the automatic start-stop signal of the frequency converter is derived from a high-pressure pump start-stop signal of the reverse osmosis system.

8. The reverse osmosis energy recovery device of claim 1, wherein the surge tank and the pressure relief valve are connected with a high-pressure concentrated water discharge port of the reverse osmosis device.