Pressure regulation and control device based on dialysis-denitrification process

Abstract

The invention relates to the field of environmental protection equipment, in particular to a dialysis-denitrification process-based pressure regulation and control device, which comprises a pressure building unit, the pressure building unit comprises a shell and a pressure regulation rotating part, the shell is provided with a cavity, and the pressure regulation rotating part is rotationally arranged in the cavity; an annular liquid passing hole is formed in the pressure regulating rotating part and comprises a pressure stabilizing section, a pressure boosting section and a pressure releasing section, the pressure stabilizing section, the pressure boosting section and the pressure releasing section are all arc-shaped, the width of the pressure releasing section is larger than that of the pressure stabilizing section and larger than that of the pressure boosting section, and the center of the ring is the same as the rotating center of the pressure regulating rotating part; one side of the shell is provided with a liquid inlet used for being connected with the osmotic distillation assembly, the other side of the shell is provided with a liquid outlet, and the liquid inlet and the liquid outlet are located on the two sides of the liquid through hole respectively; and the blocking area of the pressure regulating rotating piece on the liquid inlet is larger than that of the pressure regulating rotating piece on the pressure boosting section and the pressure stabilizing section. By means of the scheme, under the condition that a pump is not introduced, micro-pressurization is conducted on the permeation distillation assembly, and meanwhile the influence on the pressure of the Doognan dialysis assembly is small.

Description

Technical Field

[0001] The invention relates to the field of environmental protection equipment, and in particular to a pressure regulating device based on a dialysis-denitrification process. Background Art

[0002] The invention patent with Chinese patent application publication number CN116693106A discloses a wastewater treatment system based on dialysis-denitrification, including an alkali liquid tank, a Daonan dialysis component and an osmotic distillation component. The alkali liquid tank, the Daonan dialysis component and the osmotic distillation component are connected by a pipeline to form a large circulation of liquid flow. The alkali liquid tank, the Daonan dialysis component and the osmotic distillation component together constitute a liquid circulation system, so that the liquid in the alkali liquid tank flows out of the pipeline under the action of the pump and enters the Daonan dialysis component. After reacting in the Daonan dialysis component, it then enters the osmotic distillation component along the pipeline and finally returns to the alkali liquid tank along the pipeline.

[0003] This large circulation method reduces the number of circulation systems compared to separate circulation of liquids (the so-called separate circulation of liquids means that the alkali liquid tank and the Donan dialysis component constitute a separate circulation system, the alkali liquid tank and the osmotic distillation component constitute a separate circulation system, the liquid in the alkali liquid tank flows separately in the two systems, and the two systems are driven by pumps respectively), thereby reducing the use of pumps and reducing the cost of equipment.

[0004] However, in the case of large circulation flow, since the Donan dialysis component and the osmosis distillation component are connected by a longer pipe, the liquid pressure is lost when the liquid flows to the osmosis distillation component through the longer pipe, and the pressure on the side of the osmosis distillation component connected to the alkali liquid tank will be reduced, resulting in the pressure difference on both sides of the breathable and hydrophobic membrane of the osmosis distillation component becoming smaller or disappearing, which is not conducive to the flow of ammonia in the osmosis distillation component through the breathable and hydrophobic membrane to the other side.

[0005] If the liquid flowing out of the alkali liquid tank is pressurized before flowing into the Daonan dialysis component, the pressure of the entire large circulation system will increase. Although the pressure of the liquid entering the osmosis distillation component meets the requirements, the pressure in the Daonan dialysis component will also increase, and the Daonan dialysis component will be easily damaged after the pressure increases.

[0006] If a pump is added between the Donan dialysis component and the osmotic distillation component for pressurization, the liquid flowing out of the Donan dialysis component will be pressurized by the pump and flow into the osmotic distillation component. In this way, the working pressures of the Donan dialysis component and the osmotic distillation component will meet the requirements, but the number of pumps will still increase, which is inconsistent with the purpose of reducing the use of pumps and reducing equipment costs. Summary of the invention

[0007] The present invention intends to provide a pressure regulating device based on the dialysis-denitrogenation process, so as to slightly pressurize the osmotic distillation component without introducing a pump, so that the ammonia in the osmotic distillation component can flow to the other side through the breathable hydrophobic membrane. At the same time, the pressure of the Donan dialysis component is less affected by the pressurization of the osmotic distillation component.

[0008] To achieve the above-mentioned object, the present invention adopts the following technical scheme: a pressure control device based on a dialysis-denitrification process, comprising a pressure holding unit, the pressure holding unit comprising a housing, a pressure regulating rotating member and a driving unit for driving the pressure regulating rotating member to rotate, the housing is provided with a chamber, the pressure regulating rotating member is rotatably arranged in the chamber, and the two side walls of the pressure regulating rotating member are in contact with the two side inner walls of the chamber; The pressure regulating rotating member is provided with a liquid through hole, which includes a pressure stabilizing section, a pressure boosting section and a pressure releasing section. The pressure stabilizing section, the pressure boosting section and the pressure releasing section are all arc-shaped, and the pressure stabilizing section, the pressure boosting section and the pressure releasing section are sequentially connected to form a ring. The pressure stabilizing section is located between the pressure boosting section and the pressure releasing section. The width of the pressure releasing section is greater than the width of the pressure stabilizing section, and the width of the pressure boosting section is greater than the width of the pressure stabilizing section. The center of the ring is the same as the rotation center of the pressure regulating rotating member. One side of the shell is provided with a liquid inlet for connecting with the permeation distillation assembly, and the other side is provided with a liquid outlet, the liquid inlet and the liquid outlet are respectively located on both sides of the liquid through hole and are opposite and connected through the liquid through hole; The liquid inlet is partially blocked by the pressure regulating rotating part. The blocking area of ​​the pressure regulating rotating part on the liquid inlet at the boosting section is larger than that of the pressure regulating rotating part on the pressure stabilizing section.

[0009] The principles and advantages of the scheme of the present application are: the present application designs a pressure control device based on the dialysis-denitrification process, which is used to be connected to the alkali liquid outlet end of the osmotic distillation component, wherein the liquid inlet is connected to the alkali liquid outlet end of the osmotic distillation component. During the circulation of the alkali liquid in the alkali liquid tank, the Donan dialysis component and the osmotic distillation component, after the alkali liquid flows out from the alkali liquid outlet end of the osmotic distillation component, it enters the liquid inlet. At the same time, the driving unit drives the pressure regulating rotating part to rotate, and the annular liquid hole on the pressure regulating rotating part passes between the liquid inlet and the liquid outlet, and the pressure stabilizing section, the pressure boosting section and the pressure release section will pass through the liquid inlet. When the pressure stabilizing section is located at the liquid inlet, the speed at which the liquid at the liquid inlet flows into the shell is moderate (the speed at which the liquid enters the osmotic distillation component is the same as the speed at which it flows out), and the pressure in the osmotic distillation component remains basically unchanged (the same as the prior art), and is in a stable pressure state; when the pressure boosting section passes through the liquid inlet, the area of ​​the liquid inlet blocked by the pressure regulating rotating member becomes larger, the speed at which the liquid flows from the liquid inlet into the shell slows down, and the liquid in the osmotic distillation component begins to gradually accumulate, thereby achieving pressure holding in the osmotic distillation component, and the pressure in the osmotic distillation component gradually increases. When the pressure release section passes through the liquid inlet, the area of ​​the liquid inlet blocked by the pressure regulating rotating member becomes the smallest, the speed at which the liquid flows from the liquid inlet into the shell becomes faster, and the pressure in the osmotic distillation component is gradually released to an initial state that is substantially the same as the pressure in the prior art (or slightly lower than the pressure in the prior art), at which time the pressure stabilizing section passes through the liquid inlet. The above process is repeated continuously to achieve a slow pressurization process of the osmotic distillation component, and after pressurization, the pressure can be gradually released to the initial state, and will not be infinitely pressurized.

[0010] Through the pressurization of this scheme, the liquid in the osmotic distillation component will be stored, achieving the effect of holding the pressure of the osmotic distillation component, thereby increasing the pressure on the alkaline solution side of the osmotic distillation component, which is conducive to the flow of ammonia through the breathable and hydrophobic membrane to the other side.

[0011] This scheme makes the pressure in the osmosis distillation component change slowly, and the pressure in the osmosis distillation component will not increase to a certain value instantly, nor will the pressure decrease to a certain value instantly. The pressurization and pressure release processes will last for a period of time and will not be completed instantly, thereby avoiding the sudden change of pressure during the pressure release and pressure holding process and the impact on the mass transfer of ammonia. In this way, the pressure fluctuation is smaller, which can reduce the impact on the life of the membrane in the osmosis distillation component.

[0012] The pressure regulating device of the present application realizes the pressurization of the alkali liquid side of the osmotic distillation component without the aid of a pump, which is conducive to reducing equipment costs. At the same time, this pressurization method is relatively gentle, so that a small pressure difference (0.01-0.05MPa) between the alkali liquid side and the acid liquid side of the osmotic distillation component allows ammonia to pass through the membrane smoothly, which has little impact on the pressure of the Daonan dialysis component and the work of the Daonan dialysis component.

[0013] At the same time, in the present solution, liquid will continue to flow out of the osmotic distillation component during the pressure holding process, and there will be no interruption in the outflow of liquid from the osmotic distillation component.

[0014] Preferably, as an improvement, the driving unit includes a motor. Thus, the voltage regulating rotating member is driven to rotate by the motor. The motor only needs to drive the voltage regulating rotating member to rotate, and the power of the motor does not need to be set large.

[0015] Preferably, as an improvement, the driving unit includes a rotating impeller, and the blades of the impeller are opposite to the liquid outlet. Therefore, the liquid flowing out of the liquid outlet impacts the blades of the impeller, so that the impeller rotates, and the impeller drives the pressure regulating rotating member to rotate, so that the pressure regulating rotating member does not need to be driven by a motor, which is more energy-saving.

[0016] In addition, the rotation of the impeller is driven by the liquid flowing out of the liquid outlet, and the rotation speed of the impeller is related to the speed of the liquid flowing out of the liquid outlet. When the boost section passes through the liquid inlet, the area blocked by the pressure regulating rotating part of the liquid inlet becomes larger, and the speed of liquid flowing from the liquid inlet into the shell becomes slower. At this time, the liquid impact speed on the impeller becomes smaller, the impeller rotates more slowly, the pressure regulating rotating part rotates slower, and the time for the boost section to pass through the liquid inlet becomes longer, so that the boost process time is longer, which is beneficial to prolonging the pressure holding time of the osmotic distillation component. At the same time, when the pressure release section passes through the liquid inlet, the area blocked by the pressure regulating rotating part of the liquid inlet becomes the smallest, and the speed of liquid flowing from the liquid inlet into the shell becomes faster. At this time, the liquid impact speed on the impeller is larger, the impeller rotates faster, the pressure regulating rotating part rotates faster, and the time for the pressure release section to pass through the liquid inlet is shortened, so that the pressure release time is shorter, avoiding excessive pressure release. In this way, during the rotation of the impeller, the time taken for the pressure increasing process accounts for a relatively large proportion, and the pressure holding lasts for a long time, which can ensure that the permeation distillation component has a relatively long period of pressure holding and ensure the pressure holding effect.

[0017] Preferably, as an improvement, it further comprises a liquid collecting shell, the pressure holding unit is located in the liquid collecting shell, and a liquid discharge pipe is connected to the liquid collecting shell. Therefore, the liquid flowing out of the liquid outlet impacts the impeller in the liquid collecting shell, and the liquid collecting shell collects the liquid flowing out of the liquid outlet, and then discharges it into the alkali liquid tank through the liquid discharge pipe.

[0018] Preferably, as an improvement, a local portion of the liquid outlet is opposite to the blades. Thus, part of the liquid flowing out of the liquid outlet impacts the blades, which can make the impeller rotate more slowly than the liquid flowing out of the liquid outlet impacts the blades, which is conducive to maintaining the pressure holding time.

[0019] Preferably, as an improvement, a diverter plate is connected to the liquid outlet. Of course, a diverter plate can also be provided to divert the liquid flowing out of the liquid outlet, so that the liquid acting on the blades is a partial liquid.

[0020] Preferably, as an improvement, the diameter of the liquid outlet is greater than or equal to the diameter of the liquid inlet. Thus, the liquid outlet will not block the liquid.

[0021] Preferably, as an improvement, the impeller is located below the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The schematic diagram shows a pressure control device based on a dialysis-denitrification process connected to the outlet end of the alkali solution side of a osmotic distillation component.

[0023] Figure 2 It is a top view of the pressure regulating rotating part.

[0024] Figure 3 A three-dimensional schematic diagram of the impeller. DETAILED DESCRIPTION

[0025] The following is further described in detail through specific implementation methods: The figure marks in the drawings of the specification include: liquid inlet pipe 100, osmotic distillation component 101, alkali solution outlet pipe 102, liquid collecting shell 103, liquid discharge pipe 104, support frame 105, shell 106, pressure regulating rotating part 107, liquid through hole 108, impeller 109, blades 110, pressure boosting section 111, pressure release section 112, and pressure stabilizing section 113.

[0026] Example 1 Basically as attached Figure 1-Figure 3 As shown: A pressure control device based on a dialysis-denitrification process is applied to a wastewater treatment system based on dialysis-denitrification. The invention patent with the Chinese patent application publication number CN116693106A discloses a pressure control device based on a dialysis-denitrification process. The pressure control device based on the dialysis-denitrification process of this embodiment includes a pressure holding unit, which includes a housing 106, a pressure regulating rotating member 107 and a driving unit for driving the pressure regulating rotating member 107 to rotate. The housing 106 is provided with a chamber, and the pressure regulating rotating member 107 is rotatably arranged in the chamber, and the two side walls of the pressure regulating rotating member 107 are in contact with the two side inner walls of the chamber.

[0027] The pressure regulating rotating member 107 may be in the shape of a disk or a disc, and the thickness of the disc is smaller than that of the disk. The interior of the housing 106 in this embodiment is circular, matching the shape of the pressure regulating rotating member 107, and the upper and lower side surfaces of the pressure regulating rotating member 107 are respectively attached to and slidably matched with the upper and lower side surfaces of the inner wall of the chamber.

[0028] Combination Figure 2As shown, a liquid through hole 108 is provided on the pressure regulating rotating member 107. In this embodiment, the liquid through hole 108 includes a pressure stabilizing section 113, a pressure boosting section 111 and a pressure releasing section 112. The pressure stabilizing section 113, the pressure boosting section 111 and the pressure releasing section 112 are all arc-shaped. The pressure stabilizing section 113, the pressure boosting section 111 and the pressure releasing section 112 are sequentially connected to form a ring. The pressure stabilizing section 113 is located between the pressure boosting section 111 and the pressure releasing section 112. The width of the pressure releasing section 112 is greater than that of the pressure stabilizing section 113, and the width of the pressure boosting section 111 is greater than that of the pressure stabilizing section 113. The center of the ring is the same as the rotation center of the pressure regulating rotating member.

[0029] The upper side of the shell 106 is provided with a liquid inlet for connecting to the osmotic distillation component 101, and the liquid inlet is connected to the alkali liquid outlet pipe 102 of the osmotic distillation component 101. The other side is provided with a liquid outlet, and the liquid inlet and the liquid outlet are opposite and connected through the liquid hole 108. The diameter of the liquid outlet is greater than or equal to the diameter of the liquid inlet. In this embodiment, the diameter of the liquid outlet is equal to the diameter of the liquid inlet, and the two have the same shape. Figure 2 As shown, the liquid inlet is partially blocked by the pressure regulating rotating member. At the same time, the blocking area of ​​the liquid inlet by the pressure regulating rotating member at the pressure boosting section 111 is larger than the blocking area of ​​the liquid inlet by the pressure regulating rotating member at the pressure stabilizing section 113, which is larger than the blocking area of ​​the liquid inlet by the pressure regulating rotating member at the pressure release section 112.

[0030] Combination Figure 1 As shown, the driving unit includes a rotating impeller 109, and the impeller 109 is located below the housing 106. The blades 110 of the impeller 109 are opposite to the liquid outlet. The impeller 109 and the pressure regulating rotating member 107 are coaxially fixedly connected.

[0031] In addition, in order to prevent the liquid flowing out of the liquid outlet from flowing around, the pressure control device based on the dialysis-denitrification process also includes a liquid collecting shell 103. The shell 106 of the pressure holding unit is connected to the liquid collecting shell 103 through a support frame 105. The liquid collecting shell 103 is connected with a drain pipe 104, and the drain pipe 104 is used to connect to the alkali liquid tank. The alkali liquid outlet pipe 102 of the osmotic distillation component 101 passes through the side wall of the liquid collecting shell 103 and enters the liquid collecting shell 103.

[0032] During specific use, the pressure control device based on the dialysis-denitrification process of the present application is arranged between the osmosis distillation component 101 and the alkali liquid tank. The liquid in the alkali liquid tank flows to the Donan dialysis component. After the liquid reacts in the Donan dialysis component, it enters the osmosis distillation component 101 through the liquid inlet pipe 100, reacts in the osmosis distillation component 101, and after the reaction, it enters the shell 106 through the alkali liquid outlet pipe 102 and the liquid inlet, and flows out from the liquid outlet through the liquid hole 108. The liquid flowing out of the liquid outlet enters the liquid collecting shell 103 and is discharged from the discharge pipe 104. The discharged liquid enters the alkali liquid tank, thereby completing the whole cycle.

[0033] The liquid flowing out from the liquid outlet impacts the blades 110 on the impeller 109. Since the blades 110 are arranged at an angle, the blades 110 cause the impeller 109 to rotate under the impact of the liquid. The impeller 109 drives the pressure regulating rotating member 107 in the housing 106 to rotate, and different parts of the liquid through hole 108 on the pressure regulating rotating member 107 pass through the liquid inlet in sequence.

[0034] Combination Figure 2 As shown, when the pressure stabilizing section 113 passes through the liquid inlet, the outflow speed of the liquid of the osmotic distillation component 101 from the alkali liquid outlet pipe 102 is the same as the liquid flow rate of the liquid entering the osmotic distillation component 101 through the liquid inlet pipe 100, and the pressure in the osmotic distillation component 101 is basically the same as the pressure in the prior art when the device is not installed. When the boosting section 111 rotates to the liquid inlet, the degree of obstruction of the liquid inlet by the pressure regulating rotating member 107 becomes greater, and the outflow speed of the liquid from the liquid inlet through the liquid hole 108 to the liquid outlet becomes slower. At this time, the liquid outflow speed of the osmotic distillation component 101 is less than the liquid entry speed, the liquid in the osmotic distillation component 101 gradually accumulates, and the pressure in the osmotic distillation component 101 gradually and slowly increases, thereby achieving pressure boost.

[0035] Combination Figure 2 As shown, when the pressure release section 112 of the liquid hole 108 rotates to the liquid inlet, the degree of obstruction of the liquid inlet becomes smaller (less than the degree of obstruction of the stabilizing section). At this time, the liquid outflow rate in the osmotic distillation component 101 is greater than the liquid inlet rate, thereby starting to slowly release the pressure, slowly releasing the pressure in the osmotic distillation component 101 to avoid excessive pressure. Eventually, the pressure is completely released, and the pressure difference on both sides of the membrane of the osmotic distillation component 101 basically becomes the initial state when the device is not installed (the pressure difference on both sides of the membrane of the osmotic distillation component 101 is not much different from the pressure difference in the initial state when the device is not installed, and is the same as or slightly lower than the pressure difference in the initial state). At this time, the pressure stabilizing section 113 rotates to the liquid inlet again to stabilize the pressure (the pressure in the osmotic distillation component 101 does not rise or fall).

[0036] Then, the above process is repeated continuously to realize the continuous pressurization and pressure release in the osmotic distillation component 101, and the pressurization and pressure release process is slow and requires a certain amount of time to complete. During the pressurization and pressure release process, the pressure on the alkaline liquid side of the osmotic distillation component 101 is always higher than the alkaline liquid side pressure of the osmotic distillation component 101 in the prior art, which is conducive to the flow of ammonia to the acid liquid side of the osmotic distillation component 101. At the same time, the pressurization and pressure release process is gentle, and the pressurization amount is not large (the pressurization amount is 0.01-0.05MPa, specifically, the pressure difference on both sides of the membrane of the osmotic distillation component 101 is 0.02MPa), which has little impact on the internal membrane of the osmotic distillation component 101 and the impact on the Donan dialysis component.

[0037] In addition, in other embodiments, a local portion of the liquid outlet may be opposite to the blade 110. In this way, the liquid outlet will not be completely opposite to the blade 110, so that the liquid flowing out of the liquid outlet reduces the impact on the blade 110, reduces the rotation speed of the impeller 109, and further reduces the rotation speed of the pressure regulating rotating member 107, so that the rotation speed of the pressure regulating rotating member 107 will not be too fast, ensuring that the pressure increase and pressure release have a certain duration.

[0038] Of course, in other embodiments, a diverter plate (not shown in the figure) may be connected to the liquid outlet. By providing the diverter plate, the diverter plate plays a role in diverting the liquid flowing out of the liquid outlet, so that part of the liquid flowing out of the liquid outlet does not impact the blades 110, and only part of the liquid impacts the blades 110, thereby reducing the rotation speed of the impeller 109.

[0039] Of course, in other embodiments, the rotation speed of the impeller 109 may be changed by adjusting the inclination angle of the blade 110 so as to change the impact force on the blade 110 .

[0040] Example 2 This embodiment discloses a driving unit of another structure. The driving unit in this embodiment does not use structures such as an impeller 109, and the driving unit in this embodiment includes a motor (not shown in the figure). The output shaft of the motor is coaxially connected to the pressure regulating rotating member 107, so that the pressure regulating rotating member 107 is driven to rotate by the motor, and there is no need to drive the pressure regulating rotating member 107 to rotate through the impact of the liquid. Since the motor only needs to drive the pressure regulating rotating member 107 to rotate, the power of the motor does not need to be set to be large. In addition, in order to drive the pressure regulating rotating member 107 to rotate slowly, a reducer can be connected between the motor and the pressure regulating rotating member 107, so that the motor drives the pressure regulating rotating member 107 to rotate slowly.

[0041] By adopting the method in this embodiment, the liquid collecting shell 103 structure can be eliminated, and the liquid outlet can be directly connected to the alkali liquid tank through a pipeline.

[0042] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A pressure control device based on a dialysis-denitrification process, characterized in that: The pressure holding unit comprises a housing, a pressure regulating rotating member and a driving unit for driving the pressure regulating rotating member to rotate, the housing is provided with a chamber, the pressure regulating rotating member is rotatably arranged in the chamber, and two side walls of the pressure regulating rotating member are in contact with two side inner walls of the chamber; The pressure regulating rotating member is provided with a liquid through hole, and the liquid through hole includes a pressure stabilizing section, a pressure boosting section and a pressure releasing section, and the pressure stabilizing section, the pressure boosting section and the pressure releasing section are all arc-shaped, and the pressure stabilizing section, the pressure boosting section and the pressure releasing section are sequentially connected to form a ring, the pressure stabilizing section is located between the pressure boosting section and the pressure releasing section, the width of the pressure releasing section is greater than the width of the pressure stabilizing section, and the center of the ring is the same as the rotation center of the pressure regulating rotating member; One side of the shell is provided with a liquid inlet for connecting to the permeation distillation assembly, and the other side is provided with a liquid outlet, the liquid inlet and the liquid outlet are respectively located on both sides of the liquid through hole and are opposite and connected through the liquid through hole; The liquid inlet is partially blocked by the pressure regulating rotating part, and the blocking area of ​​the pressure regulating rotating part on the liquid inlet at the boosting section is larger than that of the pressure regulating rotating part at the pressure stabilizing section, and the blocking area of ​​the pressure regulating rotating part on the liquid inlet is larger than that of the pressure releasing section.

2. A pressure control device based on dialysis-denitrification process according to claim 1, characterized in that: The driving unit includes a motor.

3. The pressure control device based on the dialysis-denitrification process according to claim 1, characterized in that: The driving unit comprises a rotating impeller, and the blades of the impeller are opposite to the liquid outlet.

4. A pressure control device based on dialysis-denitrification process according to claim 3, characterized in that: It also includes a liquid collecting shell, the pressure holding unit is located in the liquid collecting shell, and the liquid collecting shell is connected with a liquid drain pipe.

5. The pressure control device based on the dialysis-denitrification process according to claim 3, characterized in that: A local portion of the liquid outlet is opposite to the blade.

6. The pressure control device based on the dialysis-denitrification process according to claim 3, characterized in that: The liquid outlet is connected with a diverter plate.

7. The pressure control device based on the dialysis-denitrification process according to claim 1, characterized in that: The diameter of the liquid outlet is greater than or equal to the diameter of the liquid inlet.

8. The pressure control device based on the dialysis-denitrification process according to claim 1, characterized in that: The impeller is located below the casing.

9. A system, characterized in that: It comprises an alkali liquid tank, a Daonan dialysis component, an osmotic distillation component and a pressure regulating device based on a dialysis-denitrification process as described in any one of claims 1-8; a pressure regulating device based on a dialysis-denitrification process is installed between the osmotic distillation component and the alkali liquid tank.

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