Energy saving energy conversion system

Abstract

The application provides an energy conversion system for energy saving, and relates to the technical field of power plant wastewater treatment. The conversion system comprises: a reverse osmosis device used for concentrating desulfurization wastewater to generate water production and first concentrated water; a pressure regulating device comprising a pair of water pressure regulating cylinders; an adjusting piston is slidably arranged in the inner cavity of the water pressure regulating cylinder, the area of the pressure receiving surface on the first sub-cavity side of the adjusting piston is smaller than the area of the pressure receiving surface on the second sub-cavity side, and the water pressure regulating cylinder is used for increasing the pressure of the desulfurization wastewater by using the first concentrated water; a rotary control valve is used for controlling the first concentrated water to enter the second sub-cavity or controlling the second concentrated water to be discharged from the second sub-cavity; and a vacuum breaking valve is used for sucking air to break the vacuum appearing in the drain pipeline. The energy conversion system for energy saving provided by the application solves the problem of energy waste caused by discharging the first concentrated water generated in the process of treating the desulfurization wastewater by valve adjustment or pressure reduction through a flow limiting orifice plate in the prior art, and improves the energy utilization rate.

Description

Technical Field

[0001] This invention relates to the field of power plant wastewater treatment technology, and more specifically, to an energy-saving energy conversion system. Background Technology

[0002] Currently, the standards for wastewater discharge are very stringent, elevating water environmental protection to the level of a national strategy. Power plants, as major water and wastewater users, account for 20% of total industrial water consumption. From multiple perspectives, cascade utilization, concentration and reduction, and water conservation are of great significance for power plants to achieve zero discharge of desulfurization wastewater. Currently, in the field of zero-discharge treatment of desulfurization wastewater, membrane concentration and reduction is the main process. The TDS of desulfurization wastewater is typically around 50,000 ppm. After multi-stage reverse osmosis membrane concentration, the concentrated wastewater's TDS can reach 100,000 ppm. This concentrated wastewater is then sent to a crystallization evaporation and drying process to ultimately form crystalline salt solids.

[0003] Currently, in the desulfurization wastewater treatment process, the incoming wastewater is typically pressurized to 100% and pumped into a high-pressure pump. This pressure is then further increased before entering the reverse osmosis system. Through the concentration and separation effect of the reverse osmosis membrane, a portion is concentrated into high-TDS high-pressure concentrate. To overcome the osmotic pressure of the high-TDS desulfurization wastewater, the reverse osmosis system requires a very high inlet pressure (50-120 bar). After concentration by reverse osmosis, the pressure of the high-TDS concentrate often decreases by 1-2 bar. This high-pressure concentrate from the reverse osmosis system is then depressurized using valve regulation or flow-limiting orifice plates, typically to below 10 bar, becoming low-pressure concentrate. This low-pressure concentrate is then discharged into the crystallization evaporation and drying process. This process results in inefficient use of the concentrate's energy, leading to energy waste. Therefore, a system to solve these problems is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide an energy-saving energy conversion system to solve the problem of energy waste caused by the discharge of the first concentrated water generated during the treatment of desulfurization wastewater in the prior art after being regulated by valves or depressurized by flow-limiting orifice plates.

[0005] To achieve the above objectives, the present invention provides an energy-saving energy conversion system connected to a raw water tank for storing and transporting desulfurization wastewater, the energy-saving energy conversion system comprising:

[0006] The reverse osmosis unit, connected to the raw water tank, is used to concentrate the desulfurization wastewater output from the raw water tank to generate permeate and first concentrate.

[0007] The pressure regulating device includes a pair of regulating water pressure cylinders. A regulating piston is slidably mounted inside the regulating water pressure cylinder, dividing the cylinder's interior into a first sub-chamber and a second sub-chamber. The area of ​​the pressure-receiving surface of the regulating piston on the first sub-chamber side is smaller than the area of ​​the pressure-receiving surface on the second sub-chamber side. The first sub-chamber of the regulating water pressure cylinder is connected to the outlet of the raw water tank and the inlet of the reverse osmosis unit. The second sub-chamber is connected to the first concentrated water outlet of the reverse osmosis unit via a rotary control valve. The first concentrated water entering the second sub-chamber of the regulating water pressure cylinder is used to increase the pressure of the desulfurization wastewater entering the corresponding first sub-chamber. After the desulfurization wastewater is pressurized, it becomes the first desulfurization wastewater and enters the reverse osmosis unit. The first concentrated water after depressurization becomes the second concentrated water and is discharged from the outlet of the rotary control valve.

[0008] The rotary control valve is used to control the first concentrated water discharged from the reverse osmosis unit to enter the second sub-chamber of the regulating water pressure cylinder or to control the second concentrated water to be discharged from the second sub-chamber of the regulating water pressure cylinder.

[0009] The vacuum breaking component, connected to the outlet of the rotary control valve via a drain pipe, is used to draw in air to break the vacuum in the drain pipe.

[0010] Specifically, the adjusting piston includes a sliding part and a guide rod part;

[0011] The sliding part is slidably disposed in the inner cavity of the regulating water pressure cylinder to divide the inner cavity of the regulating water pressure cylinder into a first sub-cavity and a second sub-cavity;

[0012] One end of the guide rod is fixed to the pressure surface of the sliding part on one side of the first sub-cavity, while the other end is exposed outside the first sub-cavity.

[0013] Specifically, the pressure regulating device further includes: a pair of inlet check valves and a pair of outlet check valves;

[0014] Each regulating water pressure cylinder has a first water inlet and a second water inlet. The first water inlet is equipped with an inlet check valve and an outlet check valve.

[0015] The first sub-chamber of each regulating water pressure cylinder is connected to the raw water tank through an inlet check valve. The desulfurization wastewater output from the raw water tank enters the first sub-chamber of the corresponding regulating water pressure cylinder through the inlet check valve and the corresponding first water inlet.

[0016] The first sub-chamber of each regulating water pressure cylinder is connected to the inlet of the reverse osmosis unit through the outlet one-way valve. The first desulfurization wastewater enters the reverse osmosis unit through the first sub-chamber of the regulating water pressure cylinder, the corresponding first water outlet, and the corresponding outlet one-way valve.

[0017] The second water inlet of each regulating water pressure cylinder is connected to the first concentrated water outlet of the reverse osmosis unit through a rotary control valve. The first concentrated water enters the second sub-chamber of the corresponding regulating water pressure cylinder through the rotary control valve and the second water inlet, and the second concentrated water is discharged after passing through the second sub-chamber and the rotary control valve.

[0018] Specifically, the rotary control valve includes: a valve body having a valve cavity, wherein a first water inlet hole, a first water outlet hole, a second water inlet hole, a second water outlet hole and an intermediate water inlet hole are provided on the cavity wall of the valve cavity;

[0019] The valve core is rotatably disposed within the valve cavity. The valve core is provided with a first water channel, a third water channel, a pair of second water channels, and a pair of fourth water channels. Adjusting the rotation angle of the valve core within the valve cavity can control the connection or disconnection of the first water inlet and the first water outlet through the first water channel, the connection or disconnection of the first water inlet and the intermediate water inlet through the corresponding second water channel, the connection or disconnection of the second water inlet and the second water outlet through the third water channel, and the connection or disconnection of the second water inlet and the intermediate water inlet through the corresponding fourth water channel.

[0020] Buffer grooves are provided at the flow outlets at both ends of the first waterway, the flow outlets at both ends of the third waterway, the flow outlet of the second waterway facing the first water inlet, and the flow outlet of the fourth waterway facing the second water inlet. The vibration caused by the change in flow rate when the liquid flows through the flow outlets of the first waterway, the second waterway, the third waterway, and the fourth waterway can be alleviated by the corresponding buffer grooves.

[0021] A control valve actuator is used to drive the valve core to rotate within the valve chamber.

[0022] Specifically, the valve body has a pair of partitions inside its valve cavity, which divide the valve cavity into a first valve cavity, a second valve cavity, and an intermediate valve cavity located between the first valve cavity and the second valve cavity. Each partition has a through hole, and the first valve cavity and the second valve cavity are respectively connected to the intermediate valve cavity through corresponding through holes. The first water inlet hole and the first water outlet hole are opened on the cavity wall of the first valve cavity, the second water inlet hole and the second water outlet hole are opened on the cavity wall of the second valve cavity, and the intermediate water inlet hole is opened on the cavity wall of the intermediate valve cavity.

[0023] Specifically, the valve core includes a connecting shaft and a cylindrical first valve core portion and a second valve core portion; the first valve core portion is rotatably disposed in the first valve cavity, the second valve core portion is rotatably disposed in the second valve cavity, and the connecting shaft is located in the intermediate valve cavity and fixed to the first valve core portion and the second valve core portion; a first water channel and a pair of second water channels are disposed on the first valve core portion, and a third water channel and a pair of fourth water channels are disposed on the second valve core portion; adjusting the rotation of the valve core can enable the first water inlet hole and the intermediate water inlet hole to be connected or disconnected through the corresponding second water channel, the corresponding through hole and the intermediate valve cavity, and the second water inlet hole and the intermediate water inlet hole to be connected or disconnected through the corresponding fourth water channel, the corresponding through hole and the intermediate valve cavity.

[0024] Specifically, the first waterway is arranged radially along the first valve core. When the first water inlet and the first water outlet are connected, the flow outlets at both ends of the first waterway are connected to the first water inlet and the first water outlet, respectively.

[0025] Specifically, each second waterway includes: a second radial waterway section and a second axial waterway section communicating with the second radial waterway section; the second radial waterway section is arranged radially along the first valve core, the second axial waterway section is arranged axially along the first valve core, the flow outlet of the second waterway at one end of the second radial waterway section is the second radial water outlet, and the flow outlet of the second waterway at one end of the second axial waterway section is the second axial water outlet; when the first water inlet hole is connected to the intermediate water inlet hole, the second radial water outlet of the second waterway is connected to the first water inlet hole, and the second axial water outlet of the second waterway is connected to the corresponding through hole.

[0026] Specifically, the third waterway is arranged radially along the second valve core. When the second water inlet and the second water outlet are connected, the flow outlets at both ends of the third waterway are connected to the second water inlet and the second water outlet, respectively.

[0027] Specifically, each fourth waterway includes: a fourth radial waterway section and a fourth axial waterway section communicating with the fourth radial waterway section; the fourth radial waterway section is arranged radially along the second valve core, the fourth axial waterway section is arranged axially along the second valve core, the flow port of the fourth waterway at one end of the fourth radial waterway section is the fourth radial water port, and the flow port of the fourth waterway at one end of the second axial waterway section is the fourth axial water port; when the second water inlet hole is connected to the intermediate water inlet hole, the fourth radial water port of the fourth waterway is connected to the second water inlet hole, and the fourth axial water port of the fourth waterway is connected to the corresponding through hole.

[0028] Specifically, the buffer groove is opened along the circumference of the first valve core at the flow outlets at both ends of the first waterway and at the second radial outlets of each second waterway, and along the circumference of the second valve core at the flow outlets at both ends of the third waterway and at the fourth radial outlets of each fourth waterway.

[0029] The energy-saving energy conversion system provided by this invention sends desulfurization wastewater from the raw water tank into a reverse osmosis unit for concentration treatment. After concentration treatment, the desulfurization wastewater generates permeable water and a first concentrated water. The permeable water is discharged from the reverse osmosis unit and enters subsequent processes, while the first concentrated water is discharged from the reverse osmosis unit and enters the second sub-chamber of a pressure regulating cylinder of a pressure regulating device. The first concentrated water pushes the regulating piston in the pressure regulating cylinder to squeeze the desulfurization wastewater entering the first sub-chamber of the pressure regulating cylinder. The pressure-receiving surface area of ​​the regulating piston on the first sub-chamber side is smaller than that on the second sub-chamber side. Thus, when the first concentrated water pushes the pressure regulating piston to squeeze the desulfurization wastewater out of the first sub-chamber, the pressure of the desulfurization wastewater increases, becoming the first desulfurization wastewater. Energy conversion achieves energy saving in the system. The first desulfurization wastewater enters the reverse osmosis unit for concentration treatment. By setting up a pressure regulating device, the pressure of the desulfurization wastewater output from the raw water tank can be adjusted using the pressure of the first concentrated water, so that the pressure of the desulfurization wastewater after the pressure increase becomes the pressure of the first desulfurization wastewater entering the reverse osmosis unit. After energy conversion, the rotary control valve is activated. The depressurized first concentrate becomes the second concentrate and is discharged from the pressure regulating device. The pressure of the first concentrate is higher than that of the second concentrate. To facilitate the introduction of the first concentrate into the pressure regulating device and the discharge of the second concentrate from it, a rotary control valve is used to switch between different flow channels, allowing the first concentrate to enter the second sub-chamber of the pressure regulating cylinder of the pressure regulating device or to discharge the second concentrate from the second sub-chamber. To prevent vibration of the rotary control valve or pipe, or water flow knocking, caused by a vacuum in the drainage pipe, a drainage pipe and a vacuum breaking component are installed at the outlet of the rotary control valve. The vacuum breaking component draws air into the drainage pipe to break the vacuum, thus preventing vibration of the rotary control valve or drainage pipe and water flow knocking. The energy-saving energy conversion system provided by this invention utilizes the pressure of the first concentrate generated from the desulfurization wastewater concentrated by the reverse osmosis unit to increase the pressure of the desulfurization wastewater fed into the reverse osmosis unit, improving energy utilization and solving the problem of energy waste caused by the discharge of the first concentrate generated during the desulfurization wastewater treatment process after valve regulation or pressure reduction by a flow-limiting orifice plate in the prior art.

[0030] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0031] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram of the energy conversion system for energy saving provided by the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the rotary control valve in the energy-saving energy conversion system provided by the present invention;

[0034] Figure 3 This is a cross-sectional view of the valve core of the rotary control valve in the energy-saving energy conversion system provided by the present invention in state P1.

[0035] Figure 4 This is a schematic diagram of the rotation of the rotary control valve in the energy-saving energy conversion system provided by the present invention;

[0036] Figure 5 yes Figure 4 Diagrams from different angles;

[0037] Figure 6 This is a schematic diagram of the structure of the rotary control valve core after it has been rotated by an angle in the energy-saving energy conversion system provided by the present invention;

[0038] Figure 7 This is a cross-sectional view of the valve core of the rotary control valve in the energy-saving energy conversion system provided by the present invention in state P2.

[0039] Figure 8 This is a cross-sectional view of the valve core of the rotary control valve in the energy-saving energy conversion system provided by the present invention in the P3 state;

[0040] Figure 9 This is a cross-sectional view of the valve core of the rotary control valve in the energy-saving energy conversion system provided by the present invention in state P4.

[0041] Figure 10 This is a cross-sectional view of the valve core of the rotary control valve in the energy-saving energy conversion system provided by the present invention in state P5.

[0042] Figure 11 This is a schematic diagram of the valve core of the rotary control valve in the energy-saving energy conversion system provided by the present invention;

[0043] Figure 12 This is a cross-sectional view of the valve core of the rotary control valve in the energy-saving energy conversion system provided by the present invention;

[0044] Figure 13 This is a cross-sectional view of the valve core of the rotary control valve in the energy-saving energy conversion system provided by the present invention from another angle;

[0045] Figure 14 This is a cross-sectional view of the valve body of the rotary control valve in the energy-saving energy conversion system provided by the present invention.

[0046] Explanation of reference numerals in the attached figures

[0047] 1-Raw water tank; 2-Reverse osmosis unit; 3-Pressure regulating device; 4-Rotary control valve; 5-Vacuum rupture assembly; 31-Pressure regulating cylinder; 32-Regulating piston; 310-First sub-chamber; 311-Second sub-chamber; 312-First water inlet; 313-Second water inlet; 314-Cylinder barrel; 315-Sealing baffle; 316-End plate; 321-Sliding part; 322-Guide rod part; 33-Inlet check valve; 34-Outlet check valve; 41-Valve body; 42-Valve core; 43-First valve chamber; 44-Second valve chamber; 45-Intermediate valve chamber; 46-Support bearing; 47-Buffer tank; 48-Control valve actuator; 51-Vacuum rupture valve; 61-First low-pressure water pump; 62-High-pressure pump; 63-Second low-pressure water pump; 64-Booster pump; 410-First water supply... Holes; 411-First drain hole; 412-Second water inlet hole; 413-Second drain hole; 414-Intermediate water inlet hole; 415-Baffle plate; 416-Through hole; 421-First water channel; 422-Second water channel; 423-Third water channel; 424-Fourth water channel; 425-Connecting shaft; 426-First valve core; 427-Second valve core; 4221-Second radial water channel section; 4222-Second axial water channel section; 4241-Fourth radial water channel section; 4242-Fourth axial water channel section; 91-First pipe; 92-Second pipe group; 921-Second main pipe; 922-Second branch pipe; 93-Third pipe; 95-Pressure regulating pipe group; 951-Pressure regulating main pipe; 952-Pressure regulating branch pipe; 6-First drainage pipe; 7-Second drainage pipe. Detailed Implementation

[0048] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0049] Figure 1 This is a schematic diagram of the structure of an energy-saving energy conversion system; Figure 2 This is a schematic diagram of the rotary control valve in an energy-saving energy conversion system; Figure 3 This is a cross-sectional view of the valve core of the rotary control valve in the P1 state of the energy-saving energy conversion system; Figure 4 This is a schematic diagram of the rotation of a rotary control valve in an energy-saving energy conversion system; Figure 5 yes Figure 4 Diagrams from different angles; Figure 6This is a cross-sectional view of the valve core of a rotary control valve in an energy-saving energy conversion system after it has been rotated by an angle. Figure 7 A cross-sectional view of the valve core of a rotary control valve in the P2 state in an energy-saving energy conversion system; Figure 8 This is a cross-sectional view of the valve core of the rotary control valve in the P3 state of the energy-saving energy conversion system; Figure 9 This is a cross-sectional view of the valve core of the rotary control valve in the P4 state of the energy-saving energy conversion system; Figure 10 This is a cross-sectional view of the valve core of the rotary control valve in the P5 state of the energy-saving energy conversion system; Figure 11 This is a schematic diagram of the valve core of a rotary control valve in an energy-saving energy conversion system;

[0050] Figure 12 This is a cross-sectional view of the valve core of a rotary control valve in an energy-saving energy conversion system; Figure 13 This is a cross-sectional view of the valve core of the rotary control valve in an energy-saving energy conversion system from another angle. Figure 14 This is a cross-sectional view of the valve body of the rotary control valve in an energy-saving energy conversion system.

[0051] like Figures 1-14 As shown, the present invention provides an energy-saving energy conversion system connected to a raw water tank 1 for storing and transporting desulfurization wastewater. The energy-saving energy conversion system includes:

[0052] The reverse osmosis unit 2 is connected to the raw water tank 1 and is used to concentrate the desulfurization wastewater output from the raw water tank 1 to generate product water and first concentrate.

[0053] The pressure regulating device 3 includes a pair of regulating water pressure cylinders 31. A regulating piston 32 is slidably disposed within the inner cavity of the regulating water pressure cylinder 31. The regulating piston 32 divides the inner cavity of the regulating water pressure cylinder 31 into a first sub-cavity 310 and a second sub-cavity 311. The area of ​​the pressure-receiving surface of the regulating piston 32 on the side of the first sub-cavity 310 is smaller than the area of ​​the pressure-receiving surface on the side of the second sub-cavity 311. The first sub-cavity 310 of the regulating water pressure cylinder 31 is connected to the outlet of the raw water tank 1 and the inlet of the reverse osmosis device 2. The second sub-cavity 311 is connected to the first concentrated water outlet of the reverse osmosis device 2 via a rotary control valve 4. The first concentrated water entering the second sub-cavity 311 of the regulating water pressure cylinder 31 increases the pressure of the desulfurization wastewater entering the corresponding first sub-cavity 310. After the desulfurization wastewater is pressurized, it becomes the first desulfurization wastewater and enters the reverse osmosis device 2. The first concentrated water after depressurization becomes the second concentrated water and is discharged from the outlet of the rotary control valve 4.

[0054] The rotary control valve 4 is used to control the first concentrated water discharged from the reverse osmosis device 2 to enter the second sub-chamber 311 of the regulating water pressure cylinder 31 or to control the second concentrated water to be discharged from the second sub-chamber 311 of the regulating water pressure cylinder 31.

[0055] The vacuum breaking component 5 is connected to the outlet of the rotary control valve 4 via a drain pipe and is used to draw in air to break the vacuum state in the drain pipe.

[0056] The energy-saving energy conversion system provided by this invention, such as Figure 1 As shown, the raw water tank 1 has two outlets: the first water tank outlet and the second water tank outlet. The first water tank outlet is connected to the inlet of the reverse osmosis unit 2 via a first pipe 91. The second water tank outlet is connected to the first chamber 310 of the pressure regulating cylinder 31 of the pressure regulating device 3 via a second pipe assembly 92. The desulfurization wastewater output from the first water tank outlet is sent into the reverse osmosis unit 2 via the first pipe 91. Figure 1As shown, a first low-pressure water pump 61 and a high-pressure pump 62 are sequentially installed on the first pipeline 91. The first low-pressure water pump 61 and the high-pressure pump 62 send the desulfurization wastewater discharged from the outlet of the first water tank 1 into the reverse osmosis unit 2. The high-pressure pump 62 can increase the pressure of the desulfurization wastewater pumped by the first low-pressure water pump 61 so that the pressure of the desulfurization wastewater meets the inlet pressure requirements of the reverse osmosis unit 2. The reverse osmosis unit 2 concentrates the incoming desulfurization wastewater. After concentration, the desulfurization wastewater generates permeable water and first concentrate. The first concentrate has a certain pressure. In order to avoid wasting the pressure energy of the first concentrate, the first concentrate is sent to the pressure regulating device 3. The second sub-chamber 311 of each pressure regulating cylinder 31 of the pressure regulating device 3 is connected to the first concentrate of the reverse osmosis unit 2. The outlet is connected via a third pipe 93. The first sub-chamber 310 of each regulating water pressure cylinder 31 of the pressure regulating device 3 is connected to the first pipe 91 via a pressure regulating pipe group 95. A rotary control valve 4 is installed on the third pipe 93, located between the regulating water pressure cylinder 31 of the reverse osmosis device 2 and the pressure regulating device 3. The rotary control valve 4 can send the first concentrated water into the second sub-chamber 311 of the corresponding regulating water pressure cylinder 31. When the pressure of the desulfurization wastewater is increased by the first concentrated water, the first sub-chamber 310 of one regulating water pressure cylinder 31 of the pressure regulating device 3 is first sent into the desulfurization wastewater. At this time, there is no first concentrated water in the second sub-chamber 311 of the regulating water pressure cylinder 31. The first concentrated water generated by the reverse osmosis device 2 through the third pipe 93 and the rotary control valve 4 enters the first sub-chamber 310 of the desulfurization wastewater. In the second sub-chamber 311 of the regulating water pressure cylinder 31, the first concentrated water pushes the regulating piston 32 within the regulating water pressure cylinder 31 to move. Under the action of the first concentrated water, the regulating piston 32 pushes the desulfurization wastewater in the first sub-chamber 310. The area of ​​the pressure-receiving surface of the regulating piston 32 on the side located in the first sub-chamber 310 is smaller than the area of ​​the pressure-receiving surface on the side located in the second sub-chamber 311. This results in the pressure of the desulfurization wastewater discharged from the first sub-chamber 310 being greater than the pressure of the first concentrated water entering the second sub-chamber 311. This also causes the pressure of the desulfurization wastewater discharged from the first sub-chamber 310 to increase, becoming the first desulfurization wastewater. That is, the pressure of the first desulfurization wastewater is higher than the pressure of the desulfurization wastewater. After entering the reverse osmosis device 2, the first desulfurization wastewater undergoes concentration treatment. Thus, it enters the pressure regulating device... The first concentrated water in the second sub-chamber 311 of the pressure regulating device 3 increases the pressure of the desulfurization wastewater entering the first sub-chamber 310 of the pressure regulating device 3. The desulfurization wastewater with increased pressure becomes the first desulfurization wastewater. After energy conversion, the pressure of the first concentrated water can be transferred to the low-pressure desulfurization wastewater. The first desulfurization wastewater discharged from the first sub-chamber 310 flows through the pressure regulating pipeline group 95 and the first pipeline 91 and then enters the reverse osmosis device 2. The pressure of the desulfurization wastewater is increased by the first concentrated water, so that the desulfurization wastewater with increased pressure meets the inlet pressure requirements of the reverse osmosis device 2. After the energy conversion is completed, the rotary control valve is driven to move. The first concentrated water after depressurization becomes the second concentrated water and flows through the rotary control valve 4 and is discharged from the outlet of the rotary control valve 4. The pressure of the first concentrated water is higher than that of the second concentrated water.Two regulating water pressure cylinders 31 are set up. When the first concentrated water enters one regulating water pressure cylinder 31 through the rotary control valve 4 to increase the pressure of the desulfurization wastewater, the second concentrated water already generated in the other regulating water pressure cylinder 31 is discharged through the rotary control valve 4. The two regulating water pressure cylinders 31 alternate to increase the pressure of the desulfurization wastewater, which can ensure the stable water supply of the reverse osmosis unit 2. The rotary control valve 4 controls the first concentrated water to enter the second sub-chamber 311 of the regulating water pressure cylinder 31 or to discharge the second concentrated water in the second sub-chamber 311. When the rotary control valve 4 switches water channels, in order to avoid the vacuum generated in the drain pipe when the second concentrated water is discharged, which would cause the rotary control valve 4 or the drain pipe to vibrate or the water flow to knock, a vacuum breaking component 5 connected to the respective drain pipe is set at the outlet of the rotary control valve 4. When the rotary control valve 4 switches and causes the water flow in one side of the drain pipe to be interrupted, the second concentrated water in this side of the pipe continues to flow forward due to inertia, resulting in a vacuum at the interruption position of this drain pipe. The vacuum breaking component 5 draws air into the vacuum position in the drain pipe, breaking the vacuum state and preventing vibration or water flow knocking phenomena from occurring in the rotary control valve 4 or the drain pipe.

[0057] The energy-saving energy conversion system provided by the present invention utilizes the pressure of the first concentrated water to increase the pressure of the desulfurization wastewater fed into the reverse osmosis unit 2 through the pressure regulating device 3, thereby improving the energy utilization rate and solving the problem of energy waste caused by the first concentrated water generated in the process of treating desulfurization wastewater being discharged after being regulated by valves or pressure reduced by flow limiting orifice plates in the prior art.

[0058] In one embodiment, in order to increase the pressure of the desulfurization wastewater through the first concentrated water, the regulating piston 32 includes: a sliding part 321 and a guide rod part 322; the sliding part 321 is slidably disposed in the inner cavity of the regulating water pressure cylinder 31 to divide the inner cavity of the regulating water pressure cylinder 31 into a first sub-cavity 310 and a second sub-cavity 311; one end of the guide rod part 322 is fixed to the pressure-bearing surface of the sliding part 321 on the side of the first sub-cavity 310, and the other end is exposed outside the first sub-cavity 310.

[0059] The pressure regulating device 3 further includes: a pair of inlet check valves 33 and a pair of outlet check valves 34;

[0060] Each regulating water pressure cylinder 31 has a first water inlet 312 and a second water inlet 313. A water inlet check valve 33 and a water outlet check valve 34 are provided at the first water inlet 312.

[0061] The first sub-chamber 310 of each regulating water pressure cylinder 31 is connected to the raw water tank 1 through the inlet check valve 33. The desulfurization wastewater output from the raw water tank 1 enters the first sub-chamber 310 of the corresponding regulating water pressure cylinder 31 through the inlet check valve 33 and the corresponding first water inlet 312.

[0062] The first sub-chamber 310 of each regulating water pressure cylinder 31 is connected to the inlet of the reverse osmosis device 2 through the outlet check valve 34. The first desulfurization wastewater enters the reverse osmosis device 2 through the first sub-chamber 310 of the regulating water pressure cylinder 31, the corresponding first water outlet 312, and the corresponding outlet check valve 34.

[0063] The second water inlet 313 of each regulating water pressure cylinder 31 is connected to the first concentrated water outlet of the reverse osmosis device 2 through the rotary control valve 4. The first concentrated water enters the second sub-chamber 311 of the corresponding regulating water pressure cylinder 31 through the rotary control valve 4 and the second water inlet 313. The second concentrated water is discharged after passing through the second sub-chamber 311 and the rotary control valve 4.

[0064] Each regulating water pressure cylinder 31 includes: a cylinder barrel 314, a sealing baffle 315, and two end plates 316; the cylinder barrel 314 is open at both ends, and an end plate 316 is respectively provided at each of the two end openings of the cylinder barrel 314. The cylinder barrel 314 and the two end plates 316 enclose the inner cavity of the regulating water pressure cylinder 31. A first water inlet 312 is provided on the end plate 316 on one side of the first sub-cavity 310, and a second water inlet 313 is provided on the end plate 316 on one side of the second sub-cavity 311. The sliding part 321 of the regulating piston 32 is slidably disposed within the inner cavity of the regulating water pressure cylinder 31. Figure 1As shown, one end of the guide rod 322 is fixed to the sliding part 321, and the other end extends through the guide hole pre-opened on the end plate 316 on the side of the first sub-cavity 310, protruding outside the first sub-cavity 310. The guide rod 322 changes the area of ​​the pressure-bearing surface of the adjusting piston 32 on the side of the first sub-cavity 310, making the area of ​​the pressure-bearing surface on the side of the first sub-cavity 310 smaller than the area of ​​the pressure-bearing surface on the side of the second sub-cavity 311. When the pressure of the desulfurization wastewater is increased by the first concentrated water, the first concentrated water pushes the adjusting piston 32 to squeeze the desulfurization wastewater out of the first water outlet 312. The pressure on the end plate 316 on the side of the first sub-cavity 310 will increase. In order to improve the sealing of the first sub-cavity 310, a sealing baffle 315 is provided in the first sub-cavity 310. The sealing baffle 315 is provided with a guide sealing hole coaxial with the guide hole and a guide sealing hole on the end plate 316 on the side of the first sub-cavity 310. The first transition port corresponding to the first water inlet 312 is connected to the first water inlet 312 through a short pipe. The guide rod part 322 of the adjusting piston 32 passes through the guide sealing hole and the guide through hole in sequence. When the first concentrated water enters the second sub-cavity 311 and pushes the adjusting piston 32 to squeeze the desulfurization wastewater in the first sub-cavity 310, the guide rod part 322 moves axially along the guide through hole and the guide sealing hole. The desulfurization wastewater enters the reverse osmosis device 2 from the first transition port, the short pipe, the first water inlet 312, the corresponding outlet one-way valve 34, the pressure regulating pipeline group 95 and the first pipeline 91. The inlet one-way valve 33 and the outlet one-way valve 34 are both used to control the flow direction of the desulfurization wastewater. The inlet one-way valve 33 controls the desulfurization wastewater output from the raw water tank 1 to enter the first sub-cavity 310. The inlet one-way valve has a check function. The outlet one-way valve 34 controls the desulfurization wastewater to be discharged from the first sub-cavity 310 and flow to the reverse osmosis device 2. The outlet one-way valve has a check function.

[0065] like Figure 1As shown, the second pipeline group 92 has a second main pipe 921 and two second branch pipes 922. One end of the second main pipe 921 is connected to the outlet of the second water tank of the original water tank 1, and the other end is connected to the two second branch pipes 922 respectively. The two second branch pipes 922 are respectively connected to the inlet check valves 33 at the first water inlets 312 of the two regulating water pressure cylinders 31. The pressure regulating pipeline group 95 has a pressure regulating main pipe 951 and two pressure regulating branch pipes 952. One end of the pressure regulating main pipe 951 is connected to the first pipeline 91, and the other end is connected to the two pressure regulating branch pipes 952. The two pressure regulating branch pipes 952 are respectively connected to the outlet check valves 34 at the first water inlets 312 of the two regulating water pressure cylinders 31. A second low-pressure water pump 63 is installed on the second main pipe 921 of the second pipeline group 92. The desulfurization wastewater discharged from the outlet of the second water tank 1 is pumped by the second low-pressure water pump 63 into the first sub-chamber 310 of the regulating water pressure cylinder 31. The desulfurization wastewater pumped by the second low-pressure water pump 63 has a low pressure and is called low-pressure desulfurization wastewater. The desulfurization wastewater pumped by the second low-pressure water pump 63 enters the corresponding first sub-chamber 310 through the second main pipe 921, the corresponding second branch pipe 922 and the first water inlet 312. The inlet check valve 33 installed at the first water inlet 312 can prevent the desulfurization wastewater entering the first sub-chamber 310 from flowing back.

[0066] The desulfurization wastewater enters the first sub-chamber 310 of a regulating water pressure cylinder 31. The desulfurization wastewater can push the regulating piston 32 in the regulating water pressure cylinder 31 to slide towards the second sub-chamber 311. The regulating piston 32 squeezes the second concentrated water that enters the second sub-chamber 311 before depressurization and becomes the second concentrated water, which is discharged through the first drain hole 411 of the rotary control valve 4. After the first concentrated water is depressurized, it becomes the second concentrated water with lower pressure. Simultaneously, the first concentrated water generated by the reverse osmosis unit 2 enters the rotary control valve 4 through the intermediate inlet 414 and flows out from the second inlet 412 of the rotary control valve 4 into the second sub-chamber 311 of another pressure regulating cylinder 31. The first concentrated water pushes the regulating piston 32 in the pressure regulating cylinder 31 to move towards the first sub-chamber 310. The first concentrated water transfers pressure energy to the desulfurization wastewater that previously entered the first sub-chamber 310 of the pressure regulating cylinder 31, thereby increasing the pressure of the desulfurization wastewater. The pressure energy of the first concentrated water is transferred to the desulfurization wastewater, and the desulfurization wastewater with increased pressure becomes the first desulfurization wastewater. It enters the reverse osmosis unit 2 through the first outlet 312 of the pressure regulating cylinder 31, the corresponding pressure regulating branch pipe 952, the pressure regulating main pipe 951, and the first pipeline 91. At the same time, it is boosted by the booster pump 64 installed on the pressure regulating main pipe 951. The first desulfurization wastewater flowing through the pressure regulating main pipe 951 is pressurized again. The water flow pressure at the outlet of the booster pump 64 and the high-pressure pump 62 is controlled to be equivalent. This ensures that the desulfurization wastewater discharged from the outlets of the first and second water pools finally enters the reverse osmosis unit 2 at a similar pressure, thus ensuring a stable pressure of the desulfurization wastewater entering the reverse osmosis unit 2. The pressure-bearing area of ​​the regulating piston 32 in the regulating water pressure cylinder 31 located on the side of the first sub-cavity 310 is smaller than the pressure-bearing area of ​​the regulating piston 32 located on the side of the second sub-cavity 311. This makes the pressure of the desulfurization wastewater discharged from the first sub-cavity 310 of the regulating water pressure cylinder 31 greater than the pressure of the first concentrated water entering the second sub-cavity 311. Consequently, the pressure of the desulfurization wastewater is also increased, reducing the head of the booster pump 64. This reduces the construction and operating costs of the entire system and achieves energy saving.

[0067] In one embodiment, such as Figures 2-14 As shown, the rotary control valve 4 includes: a valve body 41 having a valve cavity, on which a first water inlet hole 410, a first water outlet hole 411, a second water inlet hole 412, a second water outlet hole 413 and an intermediate water inlet hole 414 are provided.

[0068] Valve core 42 is rotatably disposed within the valve cavity. Valve core 42 is provided with a first water channel 421, a third water channel 423, a pair of second water channels 422, and a pair of fourth water channels 424. Adjusting the rotation angle of valve core 42 within the valve cavity allows control over the connection or disconnection of the first water inlet 410 and the first water outlet 411 via the first water channel 421; the connection or disconnection of the first water inlet 410 and the intermediate water inlet 414 via the corresponding second water channel 422; the connection or disconnection of the second water inlet 412 and the second water outlet 413 via the third water channel 423; and the connection or disconnection of the second water inlet 412 and the second water outlet 413 via the third water channel 423. 2. The intermediate water inlet 414 is connected or disconnected through the corresponding fourth water channel 424; wherein, the overflow outlets at both ends of the first water channel 421, the overflow outlets at both ends of the third water channel 423, the overflow outlet of the second water channel 422 facing the first water inlet 410, and the overflow outlet of the fourth water channel 424 facing the second water inlet 412 are all provided with buffer grooves 47, so that the vibration caused by the change in flow rate when the liquid flows through the overflow outlets of the first water channel 421, the second water channel 422, the third water channel 423 and the fourth water channel 424 can be alleviated by the corresponding buffer grooves 47;

[0069] A control valve actuator 48 is used to drive the valve core 42 to rotate within the valve chamber.

[0070] The valve body 41 has a pair of partitions 415 inside its valve cavity, which divide the valve cavity into a first valve cavity 43, a second valve cavity 44, and an intermediate valve cavity 45 located between the first valve cavity 43 and the second valve cavity 44. Each partition 415 has a through hole 416, through which the first valve cavity 43 and the second valve cavity 44 communicate with the intermediate valve cavity 45. The first water inlet hole 410 and the first water outlet hole 411 are located on the cavity wall of the first valve cavity 43, the second water inlet hole 412 and the second water outlet hole 413 are located on the cavity wall of the second valve cavity 44, and the intermediate water inlet hole 414 is located on the cavity wall of the intermediate valve cavity 45.

[0071] The valve core 42 is rotatably disposed within the valve cavity of the valve body 41. A first water inlet hole 410, a first water outlet hole 411, a second water inlet hole 412, a second water outlet hole 413, and an intermediate water inlet hole 414 are provided on the cavity wall of the valve body 41. A first water channel 421, a pair of second water channels 422, a third water channel 423, and a pair of fourth water channels 424 are provided on the valve core 42. The valve core 42 is driven to rotate within the valve cavity of the valve body 41 by the control valve actuator 48. The first water channel 421, a pair of second water channels 422, a third water channel 423, and a pair of fourth water channels 424 on the valve cavity of the valve body 41 are... A water inlet 410 and a first water outlet 411 can be connected or disconnected through a first water channel 421. The first water inlet 410 and an intermediate water inlet 414 can be connected or disconnected through a second water channel 422. The second water inlet 412 and the second water outlet 413 can be connected or disconnected through a third water channel 423. The second water inlet 412 and the intermediate water inlet 414 can be connected or disconnected through a fourth water channel 424. The control valve actuator 48 is a rotary motor, and rotating the valve core 42 can form multiple different water paths. The second water outlet 313 of one regulating water pressure cylinder 31 is connected to the first water inlet 410 of the rotary control valve 4 through a pipe. The second water outlet 313 of another regulating water pressure cylinder 31 is connected to the second water inlet 412 of the rotary control valve 4 through a pipe. The first concentrated water outlet of the reverse osmosis unit 2 is connected to the intermediate water inlet 414 of the rotary control valve 4 through a third pipe 93.

[0072] One end of the third pipe 93 is connected to the first concentrated water outlet, and the other end is connected to the middle inlet 414 of the valve body 41 of the rotary control valve 4. The first drain hole 411 and the second drain hole 413 serve as the outlets of the rotary control valve 4. The second concentrated water is finally discharged from the outlet of the rotary control valve 4. The first drain hole 411 and the second drain hole 413 are respectively connected to drainage pipes. The vacuum breaking component 5 is installed on the drainage pipes. The drainage pipe connected to the first drain hole 411 is the first drainage pipe 6, and the drainage pipe connected to the second drain hole 413 is the second drainage pipe 7. The vacuum breaking component 5 includes two vacuum breaking valves 51. A vacuum breaking valve 51 is respectively installed on the first drainage pipe 6 and the second drainage pipe 7. Air is drawn into the corresponding first drainage pipe 6 and the second drainage pipe 7 through the vacuum breaking valve 51 to break the vacuum generated.

[0073] The first concentrate discharged from the first concentrate outlet of the reverse osmosis unit 2 enters the intermediate valve chamber 45 through the third pipe 93 and the intermediate inlet hole 414. By controlling the valve core 42 to rotate at a given angle, the intermediate inlet hole 414 can be connected to either the first water inlet hole 410 or the second water inlet hole 412. The control valve actuator 48 drives the valve core 42 to rotate. If the intermediate inlet hole 414 is connected to the second water inlet hole 412, the first concentrate entering the intermediate valve chamber 45 passes through the corresponding through hole 416, a fourth water channel 424, the second water inlet hole 412, and an adjustment channel. The second water inlet 313 of the water-saving pressure cylinder 31 enters the second sub-chamber 311 of the regulating water pressure cylinder 31. The first concentrated water entering the second sub-chamber 311 pushes the regulating piston 32 in the regulating water pressure cylinder 31 to move towards the first sub-chamber 310, thereby squeezing the desulfurization wastewater in the first sub-chamber 310. The wastewater then flows through the first water inlet 312, the corresponding pressure regulating branch pipe 952, the pressure regulating main pipe 951, and the first pipe 91 into the reverse osmosis device 2. After the first concentrated water pushes the regulating piston 32 to slide to the designated position in the first sub-chamber 310, pressure energy exchange is completed. While the inlet hole 414 is connected to the second inlet hole 412, the first inlet hole 410 and the first outlet hole 411 are connected through the first water channel 421. At this time, the desulfurization wastewater in the raw water tank 1 is pumped into the first sub-chamber 310 of another regulating water pressure cylinder 31 by the second low-pressure water pump 63. The desulfurization wastewater pushes the regulating piston 32 in the regulating water pressure cylinder 31 to slide, so that the second concentrated water in the second sub-chamber 311 flows out from the second water outlet 313, the first inlet hole 410, the first water channel 421, and the first outlet hole 411 of the regulating water pressure cylinder 31. The first concentrated water is discharged through the first drainage pipe 6; the control valve core 42 rotates again to a given angle. When the first concentrated water enters the second sub-chamber 311 of another regulating water pressure cylinder 31 and undergoes energy conversion with the low-pressure desulfurization wastewater in the first sub-chamber 310, the second concentrated water formed in the second sub-chamber 311 of one regulating water pressure cylinder 31 is discharged. When the first concentrated water enters the second sub-chamber 311 of one regulating water pressure cylinder 31 and undergoes energy conversion with the low-pressure desulfurization wastewater in the first chamber 310, the second concentrated water formed in the second sub-chamber 311 of another regulating water pressure cylinder 31 is discharged.

[0074] When valve core 42 rotates to switch between different water circuits, in order to avoid water hammer phenomenon during the switching process, such as... Figure 11As shown, buffer grooves 47 are provided at the flow outlets at both ends of the first waterway 421, the flow outlets at both ends of the third waterway 423, the flow outlet at the end of the second waterway 422 facing the first water inlet 410, and the flow outlet at the end of the fourth waterway 424 facing the second water inlet 412. For example, when the valve core 42 rotates, the flow outlets at both ends of the first waterway 421 gradually shift away from the first water inlet 410 and the first water outlet 411. Under the action of the buffer grooves 47 at the flow outlets at both ends of the first waterway 421, water enters and exits the first waterway 421 through the first water inlet 410 and the first water outlet 411. The flow rate of liquid 1 changes gradually to avoid water hammer when water flows instantaneously into and out of the regulating water pressure cylinder 31. Buffer grooves 47 are provided at the flow outlets at both ends of the third waterway 423, the flow outlet at the end of the second waterway 422 facing the first water inlet 410, and the flow outlet at the end of the fourth waterway 424 facing the second water inlet 412. The buffer grooves 47 have the same function as those provided at the flow outlets at both ends of the first waterway 421. The buffer grooves 47 alleviate the vibration of the rotary control valve caused by the change in water flow rate when the first or second concentrated water enters and exits the regulating water pressure cylinder 31 through the rotary control valve 4.

[0075] The valve core 42 includes a connecting shaft 425 and a cylindrical first valve core portion 426 and a second valve core portion 427. The first valve core portion 426 is rotatably disposed within the first valve cavity 43, and the second valve core portion 427 is rotatably disposed within the second valve cavity 44. The connecting shaft 425 is located in the intermediate valve cavity 45 and fixed to the first valve core portion 426 and the second valve core portion 427. A first water channel 421 and a pair of second water channels 422 are disposed on the first valve core portion 426, and a third water channel 423 and a pair of fourth water channels 424 are disposed on the second valve core portion 426. 7. Adjust the rotation of the valve core 42. The first water inlet 410 and the intermediate water inlet 414 are connected or disconnected through the corresponding second water channel 422, the corresponding through hole 416 and the intermediate valve chamber 45. The first water inlet 410 and the first water outlet 411 are connected or disconnected through the first water channel 421. The second water inlet 412 and the intermediate water inlet 414 are connected or disconnected through the corresponding fourth water channel 424, the corresponding through hole 416 and the intermediate valve chamber 45. The second water inlet 412 and the second water outlet 412 are connected or disconnected through the third water channel 423.

[0076] The first waterway 421 and the third waterway 423 are arranged perpendicularly to each other.

[0077] A pair of second water channels 422 are symmetrically arranged with respect to the rotation centerline of the first valve core 426, and a pair of fourth water channels 424 are symmetrically arranged with respect to the rotation centerline of the second valve core 427.

[0078] The first water channel 421 is arranged radially along the first valve core 426. When the first water inlet 410 and the first water outlet 411 are connected, the water outlets at both ends of the first water channel 421 are connected to the first water inlet 410 and the first water outlet 411, respectively.

[0079] Each second waterway 422 includes: a second radial waterway section 4221 and a second axial waterway section 4222 communicating with the second radial waterway section 4221; the second radial waterway section 4221 is arranged radially along the first valve core 426, the second axial waterway section 4222 is arranged axially along the first valve core 426, the water outlet of the second waterway 422 at one end of the second radial waterway section 4221 is the second radial water outlet, and the water outlet of the second waterway 422 at one end of the second axial waterway section 4222 is the second axial water outlet; when the first water inlet 410 is connected to the intermediate water inlet 414, the second radial water outlet of the second waterway 422 is connected to the first water inlet 410, and the second axial water outlet of the second waterway 422 is connected to the corresponding through hole 416.

[0080] The third waterway 423 is arranged radially along the second valve core 427. When the second water inlet 412 and the second water outlet 413 are connected, the water outlets at both ends of the third waterway 423 are connected to the second water inlet 412 and the second water outlet 413, respectively.

[0081] Each fourth waterway 424 includes: a fourth radial waterway section 4241 and a fourth axial waterway section 4242 communicating with the fourth radial waterway section 4241; the fourth radial waterway section 4241 is arranged radially along the second valve core 427, the fourth axial waterway section 4242 is arranged axially along the second valve core 427, the flow port of the fourth waterway 424 at one end of the fourth radial waterway section 4241 is the fourth radial water port, and the flow port of the fourth waterway 424 at one end of the fourth axial waterway section 4242 is the fourth axial water port; when the second water inlet 412 is connected to the intermediate water inlet 414, the fourth radial water port of the fourth waterway 424 is connected to the second water inlet 412, and the fourth axial water port of the fourth waterway 424 is connected to the corresponding through hole 416.

[0082] The buffer groove 47 is opened along the circumference of the first valve core 426 at the flow outlets at both ends of the first waterway 421 and at the second radial outlets of each second waterway 422, and along the circumference of the second valve core 427 at the flow outlets at both ends of the third waterway 423 and at the fourth radial outlets of each fourth waterway 424.

[0083] The rotary control valve further includes a pair of rotary support bearings 46 disposed within the valve cavity for supporting the valve core 42.

[0084] like Figure 14 As shown, the valve body 41 has a main body and two end caps. The main body is a hollow cylindrical structure with openings at both ends. An end cap is installed at each end of the main body. The main body and the two end caps together form a valve cavity. Two partitions 415 are provided in the main body to divide the valve cavity into a first valve cavity 43, an intermediate valve cavity 45, and a second valve cavity 44. To allow the valve core 42 to rotate within the valve cavity, as shown... Figure 7 As shown, a support bearing 46 is provided in the valve cavity to support the valve core 42, so as to facilitate the rotation of the valve core 42. A rotary motor is provided to drive the valve core 42 to rotate.

[0085] A pair of partitions 415 are provided inside the valve cavity of the valve body 41 to divide the valve cavity of the valve body 41 into a first valve cavity 43, a second valve cavity 44, and an intermediate valve cavity 45, as follows: Figure 2 , Figure 14 As shown, a through hole 416 is provided on each partition 415. The first valve chamber 43 and the second valve chamber 44 are connected to the intermediate valve chamber 45 through the corresponding through holes 416. The intermediate water inlet hole 414 is provided on the cavity wall of the intermediate valve chamber 45. The first valve core part 426 of the valve core 42 is provided in the first valve chamber 43, and the second valve core part 427 of the valve core 42 is provided in the second valve chamber 44. The connecting shaft 425 is located in the intermediate valve chamber 45. The two ends of the connecting shaft 425 are connected to the first valve core part 426 and the second valve core part 427 respectively. The first valve core part 426, the second valve core part 427 and the connecting shaft 425 are coaxially arranged.

[0086] A first water channel 421 and a pair of second water channels 422 are both disposed on the first valve core 426. The first water channel 421 is disposed radially along the first valve core 426, and the pair of second water channels 422 are disposed symmetrically along the rotation centerline of the first valve core 426. The second radial water channel segment 4221 of each second water channel 422 is disposed radially along the first valve core 426, and the second axial water channel segment 4222 is disposed axially along the first valve core 426. The second water channel 422 is located on the second radial water channel segment 4221. The flow outlet at one end of 21 is the second radial flow outlet. The flow outlet at one end of the second axial waterway 422 is the second axial flow outlet. The buffer groove 47 is arranged circumferentially along the first valve core 426 at the flow outlets and the second radial flow outlets at both ends of the first waterway 421. The extension direction of the buffer groove 47 is consistent with the tangential direction at the flow outlets and the second radial flow outlets at both ends of the first waterway 421. The buffer groove 47 is an arc-shaped groove. The valve core 42 rotates by a first angle. The flow ports at both ends of the first water channel 421 can be aligned with the first water inlet 410 or the first water outlet 411 respectively. At this time, the first water channel 421 is connected to the first water inlet 410 and the first water outlet 411. When the valve core 42 rotates to the second angle, the second radial water outlet of the second water channel 422 is aligned with the first water inlet 410. The second axial water outlet of the second water channel 422 coincides with the through hole 416 on the corresponding partition plate 415. At this time, the first water inlet 410 and the intermediate water inlet 414 are connected through the second water channel 422, the corresponding through hole 416 and the intermediate valve chamber 45. The buffer groove 47 set in the second radial water outlet can gradually reduce the flow rate of the liquid entering and exiting through the second radial water outlet and the first water inlet 410 when the valve core 42 rotates to disconnect the connection between the first water inlet 410 and the intermediate water inlet 414. This avoids pressure fluctuations caused by sudden changes in liquid flow rate and prevents vibration of the rotary control valve 4 caused by possible water hammer.

[0087] A third water channel 423 and a pair of fourth water channels 424 are disposed on the second valve core 427. The third water channel 423 is arranged radially along the second valve core 427, and the pair of fourth water channels 424 are symmetrically arranged along the rotation centerline of the second valve core 427. The fourth radial water channel segment 4241 of each fourth water channel 424 is arranged radially along the second valve core 427, and the fourth axial water channel segment 4242 is arranged axially along the second valve core 427. The flow outlet at one end of the fourth radial water channel segment 4241 of the fourth water channel 424 is the fourth radial water outlet. The flow port at one end of the fourth axial waterway section 4242 is the fourth axial water port; the buffer groove 47 is arranged circumferentially along the second valve core 427 at the flow ports at both ends of the third waterway 423 and at the fourth radial water port, and the extension direction of the buffer groove 47 is consistent with the tangential direction of the flow ports at both ends of the third waterway 423 and the fourth radial water port; when the valve core 42 rotates at a second angle, the second radial water port of one of the second waterways 422 is aligned with the first water inlet 410, and the second axial water port of the second waterway 422 coincides with the through hole 416 on the corresponding partition 415. The upper water inlet 410 and the middle water inlet 414 are connected by a second water channel 422, a corresponding through hole 416, and an intermediate valve chamber 45. Simultaneously, the flow outlets at both ends of the third water channel 423 coincide with the second upper water inlet 412 and the second lower water inlet 413, respectively. When the valve core 42 rotates by a first angle, the flow outlets at both ends of the first water channel 421 can coincide with the first upper water inlet 410 and the first lower water inlet 411, respectively. At the same time, the fourth radial water outlet of a fourth water channel 424 coincides with the second upper water inlet 412, and the fourth axial water outlet of this fourth water channel 422 coincides with the corresponding... When the through holes 416 on plate 415 overlap, the second water inlet hole 412 and the middle water inlet hole 414 are connected through a fourth water channel 424, the corresponding through hole 416, and the middle valve chamber 45. Buffer grooves 47 are provided at the fourth radial water inlet. When the valve core 42 rotates to disconnect the connection between the second water inlet hole 412 and the middle water inlet hole 414, the flow velocity of the water entering and exiting through the second water inlet hole 412 and the fourth radial water inlet gradually decreases, avoiding pressure fluctuations caused by sudden changes in water flow rate and preventing valve vibration caused by possible water hammer.

[0088] The first water channel 421 and the third water channel 423 are arranged perpendicularly and alternately. When the valve core 42 rotates at a first angle, the first water channel 421 is connected to the first water inlet 410 and the first water outlet 411. At this time, the second water inlet 412 is connected to the middle water inlet 414 through the fourth water channel 424, the corresponding through hole 416 and the middle valve chamber 45. When the valve core 42 rotates at a second angle, the first water inlet 410 and the middle water inlet 414 are connected through the second water channel 422, the corresponding through hole 416 and the middle valve chamber 45. At this time, the second water inlet 412 and the second water outlet 413 are connected to the third water channel 423. This drives the valve core 42 to rotate, which can switch between different water channels.

[0089] The following is combined Figures 2-7 The switching action of the rotary control valve in the energy-saving energy conversion system provided by this invention will be described in detail below. For ease of description, as follows: Figure 1 As shown, the two regulating water pressure cylinders 31 are labeled as cylinder A and cylinder B, respectively:

[0090] S1: As Figure 2 and Figure 3 As shown, in the "low-pressure filling, high-pressure exchange" stage, the starting position of the valve core 42 is "0 degrees". In this state, the second low-pressure water pump 63 sends the desulfurization wastewater in the raw water tank 1 into the first sub-chamber 310 of cylinder B. The desulfurization wastewater entering the first sub-chamber 310 pushes the regulating piston 32 of cylinder B to move towards the second sub-chamber 311, so that the second concentrated water in the second sub-chamber 311 is discharged through the rotary control valve 4. After the first concentrated water is depressurized, it forms the second concentrated water. This is the low-pressure filling stage. At the same time, the first concentrated water generated by the reverse osmosis device 2 enters the second sub-chamber 311 of cylinder A through the rotary control valve 4. The first concentrated water pushes the regulating piston 32 of cylinder A to move towards the first sub-chamber 310, so that the desulfurization wastewater that previously entered the first sub-chamber 310 gains pressure and becomes the first desulfurization wastewater. This is the high-pressure exchange stage. The first desulfurization wastewater is pressurized again by the booster pump 64 and then enters the reverse osmosis device 2. At this stage, the inlet check valve 33 at the first water inlet 312 of cylinder B is in the open state, while the outlet check valve 34 at the first water inlet 312 of cylinder B is in the closed state. At the same time, the outlet check valve 34 at the first water inlet 312 of cylinder A is in the open state, while the inlet check valve 33 at the first water inlet 312 of cylinder A is in the closed state.

[0091] S2: The rotary motor drives the valve core 42 to rotate counterclockwise. The overflow ports at both ends of the third water channel 423 on the second valve core part 427 of the valve core 42 are misaligned with the second water inlet 412 and the second water outlet 413. The second radial water outlet of the second water channel 422 on the first valve core part 426 of the valve core 42 is misaligned with the first water inlet 410 on the valve body 41. As the misalignment angle increases, the resistance of the second concentrated water discharged through the rotary control valve 4 in the second sub-chamber 311 of cylinder B gradually increases, causing the amount of desulfurization wastewater entering the first sub-chamber 310 of cylinder B to gradually decrease. At the same time, the resistance of the first concentrated water entering the second sub-chamber 311 of cylinder A through the rotary control valve 4 gradually increases, causing the amount of the first concentrated water entering the second sub-chamber 311 of cylinder A to gradually decrease.

[0092] S3: In the "slow-closing" stage, the valve core 42 continues to rotate counterclockwise under the drive of the rotary motor. At this time, due to the presence of buffer grooves at the overflow ports at both ends of the third water channel 423 and at the second radial ports of the second water channel 422, the second concentrated water in the second sub-chamber 311 of cylinder B can still be discharged from the rotary control valve 4 at a relatively small flow rate through the corresponding buffer groove. The design of the buffer groove effectively avoids the water hammer problem that occurs when the second concentrated water is instantaneously cut off. At the same time, the first concentrated water can also still enter the second sub-chamber 311 of cylinder A at a relatively small flow rate through the corresponding buffer groove and the rotary control valve 4. The design of the buffer groove effectively avoids the water hammer problem that occurs when the first concentrated water is instantaneously cut off. The slow-closing function of the corresponding check valve is achieved by designing the buffer groove.

[0093] S4: As Figure 4 and Figure 5 As shown, the "low-pressure pre-pressurization, high-pressure pre-depressurization" stage is the "slow opening" stage. The valve core 42 continues to rotate counter-clockwise under the drive of the rotary motor. At this time, the buffer tanks at the flow outlets at both ends of the third waterway 423 and the second radial water outlet of the second waterway 422 are closed. The flow area of ​​the buffer tanks at the flow outlets at both ends of the first waterway 421 and the fourth radial water outlet of a fourth waterway 424 gradually increases. The first concentrated water produced by the reverse osmosis unit 2 gradually enters the second sub-chamber 311 of cylinder B through the rotary control valve 4. This is the "low-pressure pressurization" stage. The cylinder is switched to a high-pressure cylinder. At this time, the flow of the first concentrated water entering the second sub-chamber 311 of cylinder B is small, which only increases the water pressure in cylinder B without a large flow of the first concentrated water entering the second sub-chamber 311 of cylinder B. At the same time, the first concentrated water in the second sub-chamber 311 of cylinder A is depressurized and gradually discharged. This is called "high-pressure pre-depressurization". The first concentrated water that entered the second sub-chamber 311 of cylinder A is depressurized and becomes the second concentrated water before being discharged. Cylinder A is switched to a low-pressure cylinder. At this time, the flow of the second concentrated water discharged from cylinder A is small, which only increases the pressure in cylinder A without a large flow of the second concentrated water being discharged. At this time, the outlet check valve 34 set at the first water inlet 312 of cylinder B gradually opens, and the inlet check valve 33 set at the first water inlet 312 of cylinder B gradually closes, avoiding the impact of the rapid inflow and outflow of water on the valve plate of the check valve; the inlet check valve 33 set at the first water inlet 312 of cylinder A gradually opens, and the outlet check valve 34 set at the first water inlet 312 of cylinder A gradually closes. The buffer grooves set at the overflow water inlets at both ends of the first water channel 421 and at the second radial water inlet of the fourth water channel 424 prevent the generation of valve opening water hammer when the high-pressure water flow instantaneously enters the second sub-cavity 311 of cylinder B, and also prevent the check valve from being knocked when it is instantaneously opened and closed under the impact of a large flow of water.

[0094] S5: As Figure 6 and Figure 7As shown, during the "low-pressure filling, high-pressure exchange" stage, valve core 42 is in a 90-degree rotation position. Driven by the rotary motor, valve core 42 continues to rotate 90 degrees counterclockwise from S1 until the overflow ports at both ends of the first water channel 421 on the first valve core part 426 are completely aligned with the first water inlet 410 and the first water outlet 411, and the fourth radial port of the fourth water channel 424 is aligned with the second water inlet 412. During this process, the amount of desulfurization wastewater pumped into the first sub-chamber 310 of cylinder A by the second low-pressure water pump 63 gradually increases, and the amount of first concentrated water entering the second sub-chamber 311 of cylinder B through the rotary control valve 4 increases. The first concentrated water in the second sub-chamber 311 of cylinder B exchanges energy with the desulfurization wastewater in the first sub-chamber 310 of cylinder B, realizing the transmission of water flow pressure energy. The desulfurization wastewater entering the first sub-chamber 310 of cylinder A pushes the regulating piston 32 of cylinder A towards the second sub-chamber 311 of cylinder A. Meanwhile, the concentrated water entering the second sub-chamber 311 of cylinder B pushes the regulating piston 32 of cylinder B towards the first sub-chamber 310 of cylinder B. Once both the regulating pistons 32 of cylinder A and cylinder B have moved to their designated positions, the valve core 42 rotates counterclockwise by 90 degrees in preparation for the next step. During this stage, the inlet check valve 33 at the first water inlet 312 of cylinder A is open, and the outlet check valve 34 at the first water inlet 312 of cylinder A is closed. Similarly, the outlet check valve 34 at the first water inlet 312 of cylinder B is open, and the inlet check valve 33 at the first water inlet 312 of cylinder B is closed.

[0095] The above S1-S5 refers to the action of the valve core 42 of the rotary control valve 4 rotating 90 degrees. When the valve core 42 rotates 90 degrees again, the rotary motor drives the valve core 42 to rotate. During the 90-degree rotation, the valve core 42 successively presents the "slow closing" stage, the "slow opening" stage, and the "low pressure filling and high pressure exchange" stage.

[0096] Regarding the positional states of the valve core 42 and valve body 41 of the rotary control valve 4 at positions of 0 degrees, 90 degrees, 180 degrees, 270 degrees, and 360 degrees during counterclockwise rotation:

[0097] P1: The starting position of the rotation of valve core 42 is recorded as "0-degree position". This state is as follows: Figure 3As shown, the second radial water inlet of the second water channel 422 of the first valve core 426 is connected to the first water inlet 410, and the second axial water inlet is connected to the through hole 416 on the corresponding partition 415. The flow outlets at both ends of the first water channel 421 are blocked by the valve body 41. The first concentrated water generated by the reverse osmosis device 2 enters the second sub-cavity 311 of cylinder A through the intermediate water inlet 414, the intermediate valve cavity 45, the corresponding through hole 416, the second axial water inlet, the second water channel 422, the second radial water inlet, and the first water inlet 410. The fourth radial water inlet and the fourth axial water inlet of the two fourth water channels 424 on the second valve core 427 are blocked, while the flow outlets at both ends of the third water channel 423 are aligned with the second water inlet 412 and the second water outlet 413 respectively. The second concentrated water in the second sub-cavity 311 of cylinder B is discharged from the second water outlet 413 after passing through the third water channel 423 of the rotary control valve 4.

[0098] P2: Valve core 42 rotates 90 degrees from its initial position P1, denoted as the "90-degree position". This state is as follows: Figure 7 As shown, the second radial and second axial water inlets of the two second water channels 422 of the first valve core 426 are blocked. The flow outlets at both ends of the first water channel 421 are aligned with the first water inlet 410 and the first water outlet 411. The second concentrated water in the second sub-chamber 311 of cylinder A is discharged from the first water outlet 411 after passing through the first water channel 421 of the rotary control valve 4. The flow outlets at both ends of the third water channel 423 of the second valve core 427 are blocked. The fourth radial water inlet of the fourth water channel 424 of the second valve core 427 is aligned with the second water inlet 412, and the fourth axial water inlet is aligned with the corresponding through hole 416. The first concentrated water generated by the reverse osmosis device 2 enters the second sub-chamber 311 of cylinder B through the intermediate inlet 414, intermediate valve chamber 45, corresponding through hole 416, fourth axial water inlet, fourth water channel 424, fourth radial water inlet and second water inlet 412.

[0099] P3: Valve core 42 rotates another 90 degrees from the P2 position, recorded as the "180-degree position". This state is as follows: Figure 8As shown, the water flow at both ends of the first water channel 421 of the first valve core 426 is blocked. The second radial water port of the second water channel 422 on the first valve core 426 is connected to the first water inlet 410. The second axial water port is connected to the through hole 416 on the corresponding partition 415. The first concentrated water generated by the reverse osmosis device 2 enters the second sub-cavity 311 of cylinder A through the intermediate water inlet 414, intermediate valve cavity 45, corresponding through hole 416, second axial water port, second water channel 422, second radial water port and first water inlet 410. The fourth radial water port and fourth axial water port of the two fourth water channels 424 on the second valve core 427 are blocked. The water flow ports at both ends of the third water channel 423 are aligned with the second water inlet 412 and the second water outlet 413 respectively. The second concentrated water in the second sub-cavity 311 of cylinder B is discharged from the second water outlet 413 after passing through the third water channel 423 of the rotary control valve 4.

[0100] P4: Valve core 42 rotates another 90 degrees from the P3 position, recorded as the "270-degree position". This state is as follows: Figure 9 As shown, the second radial and second axial water inlets of the two second water channels 422 of the first valve core 426 are blocked. The flow outlets at both ends of the first water channel 421 are aligned with the first water inlet 410 and the first water outlet 411. The second concentrated water in the second sub-chamber 311 of cylinder A is discharged from the first water outlet 411 after passing through the first water channel 421 of the rotary control valve 4. The flow outlets at both ends of the third water channel 423 of the second valve core 427 are blocked. The fourth radial water inlet of the other fourth water channel 424 of the second valve core 427 is aligned with the second water inlet 412, and the fourth axial water inlet is aligned with the corresponding through hole 416. The first concentrated water generated by the reverse osmosis device 2 enters the second sub-chamber 311 of cylinder B through the intermediate inlet 414, intermediate valve chamber 45, corresponding through hole 416, fourth axial water inlet, fourth water channel 424, fourth radial water inlet and second water inlet 412.

[0101] P5: Valve core 42 rotates another 90 degrees from position P4, denoted as the "360-degree position". This state coincides with the "0-degree position" of P1. This state is as follows: Figure 10As shown, the second radial water inlet of the second water channel 422 of the first valve core 426 is connected to the first water inlet 410, and the second axial water inlet is connected to the through hole 416 on the corresponding partition 415. The flow outlets at both ends of the first water channel 421 are blocked by the valve body 41. The first concentrated water generated by the reverse osmosis device 2 enters the second sub-cavity 311 of cylinder A through the intermediate water inlet 414, the intermediate valve cavity 45, the corresponding through hole 416, the second axial water inlet, the second water channel 422, the second radial water inlet, and the first water inlet 410. The fourth radial water inlet and the fourth axial water inlet of the two fourth water channels 424 on the second valve core 427 are blocked, while the flow outlets at both ends of the third water channel 423 are aligned with the second water inlet 412 and the second water outlet 413 respectively. The second concentrated water in the second sub-cavity 311 of cylinder B is discharged from the second water outlet 413 after passing through the third water channel 423 of the rotary control valve 4.

[0102] Once the valve core 42 completes one 360-degree circular rotation, it then begins another 360-degree circular rotation under the action of the control valve actuator 48.

[0103] The energy-saving energy conversion system provided by this invention sends desulfurization wastewater from the raw water tank into a reverse osmosis unit for concentration treatment. After concentration treatment, the desulfurization wastewater generates permeable water and a first concentrated water. The permeable water is discharged from the reverse osmosis unit and enters subsequent processes, while the first concentrated water is discharged from the reverse osmosis unit and enters the second sub-chamber of a pressure regulating cylinder of a pressure regulating device. The first concentrated water pushes the regulating piston in the pressure regulating cylinder to squeeze the desulfurization wastewater entering the first sub-chamber of the pressure regulating cylinder. The pressure-receiving surface area of ​​the regulating piston on the first sub-chamber side is smaller than that on the second sub-chamber side. Thus, when the first concentrated water pushes the pressure regulating piston to squeeze the desulfurization wastewater out of the first sub-chamber, the pressure of the desulfurization wastewater increases, becoming the first desulfurization wastewater. Energy conversion achieves energy saving in the system. The first desulfurization wastewater enters the reverse osmosis unit for concentration treatment. By setting up a pressure regulating device, the pressure of the desulfurization wastewater output from the raw water tank can be adjusted using the pressure of the first concentrated water, so that the pressure of the desulfurization wastewater after the pressure increase becomes the pressure of the first desulfurization wastewater entering the reverse osmosis unit. After energy conversion, the rotary control valve is activated. The depressurized first concentrate becomes the second concentrate and is discharged from the pressure regulating device. The pressure of the first concentrate is higher than that of the second concentrate. To facilitate the introduction of the first concentrate into the pressure regulating device and the discharge of the second concentrate from it, a rotary control valve is used to switch between different flow channels, allowing the first concentrate to enter the second sub-chamber of the pressure regulating cylinder of the pressure regulating device or to discharge the second concentrate from the second sub-chamber. To prevent vibration of the rotary control valve or pipe, or water flow knocking, caused by a vacuum in the drainage pipe, a drainage pipe and a vacuum breaking component are installed at the outlet of the rotary control valve. The vacuum breaking component draws air into the drainage pipe to break the vacuum, thus preventing vibration of the rotary control valve or drainage pipe and water flow knocking. The energy-saving energy conversion system provided by this invention utilizes the pressure of the first concentrate generated from the desulfurization wastewater concentrated by the reverse osmosis unit to increase the pressure of the desulfurization wastewater fed into the reverse osmosis unit, improving energy utilization and solving the problem of energy waste caused by the discharge of the first concentrate generated during the desulfurization wastewater treatment process after valve regulation or pressure reduction by a flow-limiting orifice plate in the prior art.

[0104] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0105] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0106] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. An energy-saving energy conversion system, connected to a raw water tank (1) for storing and transporting desulfurization wastewater, characterized in that, The energy-saving energy conversion system includes: Reverse osmosis unit (2) is used to concentrate the desulfurization wastewater output from the raw water tank (1) to generate permeate and first concentrate; The pressure regulating device (3) includes a pair of regulating water pressure cylinders (31); a regulating piston (32) is slidably arranged in the inner cavity of the regulating water pressure cylinder (31), the regulating piston (32) divides the inner cavity of the regulating water pressure cylinder (31) into a first sub-cavity (310) and a second sub-cavity (311), the area of ​​the pressure-bearing surface of the regulating piston (32) on the side of the first sub-cavity (310) is smaller than the area of ​​the pressure-bearing surface on the side of the second sub-cavity (311); the first sub-cavity (310) of the regulating water pressure cylinder (31) is connected to the outlet of the raw water tank (1) and the inlet of the reverse osmosis device (2). Next, the second sub-chamber (311) is connected to the first concentrated water outlet of the reverse osmosis device (2) through a rotary control valve (4). The first concentrated water entering the second sub-chamber (311) of the regulating water pressure cylinder (31) is used to increase the pressure of the desulfurization wastewater entering the corresponding first sub-chamber (310). After the desulfurization wastewater is pressurized, it becomes the first desulfurization wastewater and enters the reverse osmosis device (2). The first concentrated water after depressurization becomes the second concentrated water and is discharged from the outlet of the rotary control valve (4). The regulating piston (32) includes a sliding part (321) and a guide rod part (322). The sliding part (321) is slidably disposed in the inner cavity of the regulating water pressure cylinder (31) to divide the inner cavity of the regulating water pressure cylinder (31) into a first sub-cavity (310) and a second sub-cavity (311). One end of the guide rod (322) is fixed to the pressure surface of the sliding part (321) on one side of the first sub-cavity (310), and the other end is exposed outside the first sub-cavity (310); The rotary control valve (4) is used to control the first concentrated water discharged from the reverse osmosis unit (2) to enter the second sub-chamber (311) of the regulating water pressure cylinder (31) or to control the second concentrated water to be discharged from the second sub-chamber (311) of the regulating water pressure cylinder (31); the rotary control valve (4) includes: The valve body (41) has a valve cavity, and a first water inlet hole (410), a first water outlet hole (411), a second water inlet hole (412), a second water outlet hole (413) and an intermediate water inlet hole (414) are provided on the cavity wall of the valve cavity. The valve core (42) is rotatably disposed in the valve cavity. The valve core (42) is provided with a first water channel (421), a third water channel (423), a pair of second water channels (422), and a pair of fourth water channels (424). By adjusting the rotation angle of the valve core (42) in the valve cavity, it is possible to control the first water inlet (410) and the first water outlet (411) to be connected or disconnected through the first water channel (421), the first water inlet (410) and the intermediate water inlet (414) to be connected or disconnected through the corresponding second water channel (422), the second water inlet (412) and the second water outlet (413) to be connected or disconnected through the third water channel (423), and the second water inlet (412) and the intermediate water inlet (414) to be connected or disconnected through the corresponding fourth water channel (424). Among them, buffer grooves (47) are provided at the flow outlets at both ends of the first waterway (421), the flow outlets at both ends of the third waterway (423), the flow outlet at the end of the second waterway (422) facing the first water inlet (410), and the flow outlet at the end of the fourth waterway (424) facing the second water inlet (412). When the liquid flows through the flow outlets of the first waterway (421), the second waterway (422), the third waterway (423), and the fourth waterway (424), the vibration caused by the change in flow rate can be alleviated by the corresponding buffer grooves (47). The buffer grooves (47) are arc-shaped grooves. A control valve actuator (48) is used to drive the valve core (42) to rotate within the valve chamber; The vacuum breaking component (5) is connected to the outlet of the rotary control valve (4) via a drain pipe and is used to draw in air to break the vacuum state in the drain pipe.

2. The energy-saving energy conversion system according to claim 1, characterized in that, The pressure regulating device (3) further includes: a pair of inlet check valves (33) and a pair of outlet check valves (34); Each regulating water pressure cylinder (31) has a first water inlet (312) and a second water inlet (313). A water inlet check valve (33) and a water outlet check valve (34) are provided at the first water inlet (312). The first sub-chamber (310) of each regulating water pressure cylinder (31) is connected to the raw water tank (1) through the inlet check valve (33). The desulfurization wastewater output from the raw water tank (1) enters the first sub-chamber (310) of the corresponding regulating water pressure cylinder (31) through the inlet check valve (33) and the corresponding first water outlet (312). The first sub-chamber (310) of each regulating water pressure cylinder (31) is connected to the inlet of the reverse osmosis device (2) through the outlet check valve (34). The first desulfurization wastewater enters the reverse osmosis device (2) through the first sub-chamber (310) of the regulating water pressure cylinder (31), the corresponding first water outlet (312), and the corresponding outlet check valve (34). The second water inlet (313) of each regulating water pressure cylinder (31) is connected to the first concentrated water outlet of the reverse osmosis device (2) through a rotary control valve (4). The first concentrated water enters the second sub-chamber (311) of the corresponding regulating water pressure cylinder (31) through the rotary control valve (4) and the second water inlet (313). The second concentrated water is discharged after passing through the second sub-chamber (311) and the rotary control valve (4).

3. The energy-saving energy conversion system according to claim 1, characterized in that, The valve body (41) has a pair of partitions (415) inside its valve cavity, which divide the valve cavity into a first valve cavity (43), a second valve cavity (44), and an intermediate valve cavity (45) located between the first valve cavity (43) and the second valve cavity (44). Each partition (415) has a through hole (416), and the first valve cavity (43) and the second valve cavity (44) are connected to the intermediate valve cavity (45) through the corresponding through hole (416). The first water inlet hole (410) and the first water outlet hole (411) are opened on the cavity wall of the first valve cavity (43), the second water inlet hole (412) and the second water outlet hole (413) are opened on the cavity wall of the second valve cavity (44), and the intermediate water inlet hole (414) is opened on the cavity wall of the intermediate valve cavity (45).

4. The energy-saving energy conversion system according to claim 3, characterized in that, The valve core (42) includes a connecting shaft (425) and a cylindrical first valve core portion (426) and a second valve core portion (427); the first valve core portion (426) is rotatably disposed in the first valve cavity (43), and the second valve core portion (427) is rotatably disposed in the second valve cavity (44); the connecting shaft (425) is located in the intermediate valve cavity (45) and fixed to the first valve core portion (426) and the second valve core portion (427); a first water channel (421) and a pair of second water channels (422) are disposed in the first valve core portion (426) and the second valve core portion (427). On the second valve core (427), the third water channel (423) and a pair of fourth water channels (424) are arranged on the second valve core (427); by adjusting the rotation of the valve core (42), the first water inlet (410) and the intermediate water inlet (414) can be connected or disconnected through the corresponding second water channel (422), the corresponding through hole (416) and the intermediate valve cavity (45), and the second water inlet (412) and the intermediate water inlet (414) can be connected or disconnected through the corresponding fourth water channel (424), the corresponding through hole (416) and the intermediate valve cavity (45).

5. The energy-saving energy conversion system according to claim 4, characterized in that, The first waterway (421) is arranged radially along the first valve core (426). When the first water inlet (410) and the first water outlet (411) are connected, the water outlets at both ends of the first waterway (421) are connected to the first water inlet (410) and the first water outlet (411) respectively.

6. The energy-saving energy conversion system according to claim 5, characterized in that, Each second waterway (422) includes: a second radial waterway segment (4221) and a second axial waterway segment (4222) communicating with the second radial waterway segment (4221). The second radial water channel section (4221) is arranged radially along the first valve core (426), and the second axial water channel section (4222) is arranged axially along the first valve core (426). The water outlet at one end of the second water channel (422) is the second radial water outlet, and the water outlet at one end of the second axial water channel section (4222) is the second axial water outlet. When the first water inlet (410) is connected to the intermediate water inlet (414), the second radial water outlet of the second water channel (422) is connected to the first water inlet (410), and the second axial water outlet of the second water channel (422) is connected to the corresponding through hole (416).

7. The energy-saving energy conversion system according to claim 4, characterized in that, The third waterway (423) is arranged radially along the second valve core (427). When the second water inlet (412) and the second water outlet (413) are connected, the water outlets at both ends of the third waterway (423) are connected to the second water inlet (412) and the second water outlet (413) respectively.

8. The energy-saving energy conversion system according to claim 7, characterized in that, Each fourth waterway (424) includes: a fourth radial waterway segment (4241) and a fourth axial waterway segment (4242) connected to the fourth radial waterway segment (4241). The fourth radial water channel section (4241) is arranged radially along the second valve core (427), the fourth axial water channel section (4242) is arranged axially along the second valve core (427), the flow port of the fourth water channel (424) at one end of the fourth radial water channel section (4241) is the fourth radial water port, and the flow port of the fourth water channel (424) at one end of the fourth axial water channel section (4242) is the fourth axial water port; When the second water inlet (412) is connected to the intermediate water inlet (414), the fourth radial water outlet of the fourth water channel (424) is connected to the second water inlet (412), and the fourth axial water outlet of the fourth water channel (424) is connected to the corresponding through hole (416).

9. The energy-saving energy conversion system according to claim 8, characterized in that, The buffer groove (47) is opened along the circumference of the first valve core (426) at the flow outlets at both ends of the first waterway (421) and at the second radial outlets of each second waterway (422), and along the circumference of the second valve core (427) at the flow outlets at both ends of the third waterway (423) and at the fourth radial outlets of each fourth waterway (424).

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