A pressure control device based on dialysis-denitrification process

Abstract

This invention relates to the field of environmental protection equipment, specifically to a pressure regulation device based on a dialysis-denitrification process. The device includes a pressure-regulating unit, which comprises a housing and a pressure-regulating rotating component. The housing has a chamber in which the pressure-regulating rotating component is rotatably disposed. The rotating component has an annular liquid passage, which includes a pressure-stabilizing section, a pressure-increasing section, and a pressure-relieving section. All three sections are arc-shaped, with the width of the pressure-relieving section greater than that of the pressure-stabilizing section, which is also greater than that of the pressure-increasing section. The center of the annulus coincides with the rotation center of the rotating component. One side of the housing has an inlet for connection to a pervaporation assembly, and the other side has an outlet, located on opposite sides of the liquid passage. The pressure-regulating rotating component at the pressure-increasing section has a larger blocking area than at the pressure-stabilizing section, which is also larger than that at the pressure-relieving section, for the inlet. This invention allows for micro-pressurization of the pervaporation assembly without the introduction of a pump, while minimizing the impact on the pressure of the dialysis assembly.

Description

Technical Field

[0001] This invention relates to the field of environmental protection equipment, and specifically to a pressure control device based on a dialysis-denitrification process. Background Technology

[0002] Chinese patent application publication number CN116693106A discloses a wastewater treatment system based on dialysis-denitrification, including an alkali tank, a Daonan dialysis module, and a percolation distillation module. The alkali tank, Daonan dialysis module, and percolation distillation module are connected by pipelines to form a large-scale liquid circulation system. The alkali tank, Daonan dialysis module, and percolation distillation module together form a liquid circulation system. In this way, the liquid in the alkali tank flows out of the pipeline under the action of a pump and enters the Daonan dialysis module. After reacting in the Daonan dialysis module, it then enters the percolation distillation module along the pipeline and finally returns to the alkali tank along the pipeline.

[0003] Compared to separate liquid circulation (where the alkali tank and the Daonan dialysis unit each form a separate circulation system, and the alkali tank and the permeation distillation unit each form a separate circulation system, with the liquid in the alkali tank flowing separately in the two systems, each driven by a pump), this large-scale circulation method reduces the number of circulation systems, thereby reducing the use of pumps and lowering equipment costs.

[0004] However, in the case of large-scale circulation, since the Daonan dialysis unit and the percolation unit are connected by a long pipeline, the liquid pressure is lost when the liquid flows to the percolation unit through the long pipeline. The pressure on the side of the percolation unit connected to the alkali tank will be reduced, which will cause the pressure difference on both sides of the permeable and hydrophobic membrane of the percolation unit to decrease or disappear. This is not conducive to the flow of ammonia gas in the percolation unit through the permeable and hydrophobic membrane to the other side.

[0005] If the liquid flowing out of the alkali tank is pressurized before flowing into the Daonan dialysis unit, the pressure of the entire circulation system will increase. Although the liquid pressure entering the permeation distillation unit meets the requirements, this will also increase the pressure in the Daonan dialysis unit, which is prone to damage.

[0006] If a pump is added between the Daonan dialysis unit and the perhydration distillation unit to pressurize the liquid flowing out of the Daonan dialysis unit, the liquid will flow into the perhydration distillation unit after being pressurized by the pump. In this way, the working pressure of both the Daonan dialysis unit and the perhydration distillation unit will meet the requirements. However, this will still increase the number of pumps, which is inconsistent with the goal of reducing the use of pumps and reducing equipment costs. Summary of the Invention

[0007] The present invention aims to provide a pressure control device based on dialysis-denitrification process, which can micro-pressurize the percolation distillation component without introducing a pump, so that ammonia gas in the percolation distillation component can flow to the other side through the gas-permeable hydrophobic membrane, while the pressurization of the percolation distillation component has little impact on the pressure of the Daonan dialysis component.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a pressure regulating device based on dialysis-denitrification process, comprising a pressure regulating unit, the pressure regulating unit comprising a shell, a pressure regulating rotating component and a driving unit for driving the pressure regulating rotating component to rotate, the shell having a chamber, the pressure regulating rotating component being rotatably disposed in the chamber, the two side walls of the pressure regulating rotating component being in contact with the two side inner walls of the chamber;

[0009] The pressure regulating rotating component is provided with a liquid passage hole, which includes a pressure stabilizing section, a pressure increasing section, and a pressure releasing section. The pressure stabilizing section, the pressure increasing section, and the pressure releasing section are all arc-shaped and are connected in sequence to form a ring. The pressure stabilizing section is located between the pressure increasing section and the pressure releasing section. The width of the pressure releasing section is greater than the width of the pressure stabilizing section, which is greater than the width of the pressure increasing section. The center of the ring is the same as the rotation center of the pressure regulating rotating component.

[0010] One side of the housing is provided with an inlet for connection to the permeation distillation assembly, and the other side is provided with an outlet. The inlet and outlet are located on both sides of the liquid passage and are connected to each other through the liquid passage.

[0011] The inlet is partially blocked by the pressure regulating rotating component. The area of ​​the pressure regulating rotating component blocking the inlet in the pressure boosting section is greater than that in the pressure stabilizing section, which is greater than that in the pressure relief section.

[0012] The principle and advantages of this application are as follows: This application designs a pressure regulating device based on a dialysis-denitrification process. This device is connected to the alkali outlet of the percolation distillation component, wherein the inlet is connected to the alkali outlet of the percolation distillation component. During the circulation of alkali in the alkali tank, the dialysis component, and the percolation distillation component, after the alkali flows out from the alkali outlet of the percolation distillation component, it enters the inlet. Simultaneously, the drive unit drives the pressure regulating rotating component to rotate. The annular liquid passage on the pressure regulating rotating component passes between the inlet and the outlet. The pressure stabilization section, the pressure boosting section, and the pressure relief section all pass through the inlet. When the pressure stabilizing section is located at the inlet, the liquid flow rate into the housing is moderate (the liquid entering the percolation assembly has the same flow rate as the liquid exiting), and the pressure in the percolation assembly remains essentially constant (same as in the prior art), maintaining a stable pressure state. When the pressure boosting section passes the inlet, the area blocked by the pressure regulating rotating component increases, slowing the liquid flow rate into the housing. Liquid begins to gradually accumulate in the percolation assembly, achieving pressure buildup and gradually increasing the pressure. Conversely, when the pressure relief section passes the inlet, the area blocked by the pressure regulating rotating component becomes minimal, increasing the liquid flow rate into the housing. The pressure in the percolation assembly gradually releases, returning to an initial state similar to (or slightly lower than) that of the prior art. At this point, the pressure stabilizing section passes the inlet. This process is repeated continuously, achieving a slow pressurization process in the percolation assembly. Furthermore, after pressurization, the pressure is gradually released back to the initial state, preventing indefinite pressurization.

[0013] By pressurizing the components in this scheme, the liquid in the percolation distillation unit will accumulate, achieving the effect of pressure buildup in the percolation distillation unit. This increases the pressure on the alkaline side of the percolation distillation unit, which is beneficial for ammonia to flow to the other side through the breathable and hydrophobic membrane.

[0014] This design allows for slow pressure changes in the pervaporation unit, preventing sudden pressure increases or decreases. Both pressurization and depressurization processes are sustained over time, avoiding abrupt pressure changes that could affect ammonia mass transfer. This results in smaller pressure fluctuations, reducing the impact on the membrane lifespan in the pervaporation unit.

[0015] The pressure regulation device of this application achieves pressurization on the alkaline side of the percolation distillation unit without the need for a pump, which helps reduce equipment costs. At the same time, this pressurization method is relatively gentle, resulting in a small pressure difference (0.01-0.05 MPa) between the alkaline and acidic sides of the percolation distillation unit, allowing ammonia to pass smoothly through the membrane. This has minimal impact on the pressure of the Daonan dialysis unit and its operation.

[0016] Meanwhile, in this solution, liquid will continuously flow out during the pressurization process of the percolation distillation unit, and there will be no interruption in the liquid flow of the percolation distillation unit.

[0017] Preferably, as an improvement, the drive unit includes a motor. Thus, the motor drives the pressure regulating rotating component to rotate. The motor only needs to drive the pressure regulating rotating component; therefore, the motor power does not need to be set too high.

[0018] Preferably, as an improvement, the drive unit includes a rotating impeller with impeller blades facing the liquid outlet. Thus, the liquid flowing from the outlet impacts the impeller blades, causing the impeller to rotate. The impeller then drives the pressure regulating rotating component to rotate, eliminating the need for a motor to drive the pressure regulating rotating component, resulting in greater energy savings.

[0019] Furthermore, the impeller's rotation is driven by the liquid flowing out of the outlet, and its rotational speed is related to the outflow velocity. When the pressurization section passes the inlet, the area blocked by the pressure-regulating rotating component increases, slowing the liquid's flow rate into the housing. This reduces the liquid impact velocity on the impeller, resulting in slower impeller rotation. The pressure-regulating rotating component also rotates slowly, extending the time the pressurization section spends over the inlet, thus prolonging the pressurization process and extending the pressure-holding time of the permeation distillation unit. Conversely, when the pressure relief section passes the inlet, the area blocked by the pressure-regulating rotating component becomes minimal, increasing the liquid's flow rate into the housing. This results in a higher liquid impact velocity on the impeller, leading to faster impeller rotation. The pressure-regulating rotating component rotates faster, shortening the time the pressure relief section spends over the inlet, thus reducing the pressure release time and preventing excessive pressure release. In this way, the time spent in the pressurization process during impeller rotation is relatively large, and the pressurization duration is long, which can ensure that the percolation distillation module has a long period of pressurization and ensure the pressurization effect.

[0020] Preferably, as an improvement, it also includes a liquid collecting shell, in which the pressure-retaining unit is located, and a drain pipe is connected to the liquid collecting shell. Thus, the process of liquid impacting the impeller from the outlet takes place in the liquid collecting shell, which collects the liquid from the outlet and then discharges it into the alkali tank through the drain pipe.

[0021] Preferably, as an improvement, a portion of the liquid outlet is positioned opposite the blades. This allows only a portion of the liquid flowing from the outlet to impact the blades, compared to the entire liquid flowing from the outlet impacting the blades. This results in a slower impeller rotation speed, which helps maintain the pressure holding time.

[0022] Preferably, as an improvement, a flow divider is connected to the liquid outlet. Alternatively, a flow divider can be installed to divert the liquid flowing from the outlet, thus ensuring that only a portion of the liquid acts on the blades.

[0023] Preferably, as an improvement, the diameter of the outlet is greater than or equal to the diameter of the inlet. Therefore, the outlet will not obstruct the liquid flow.

[0024] Preferably, as an improvement, the impeller is located below the housing. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a pressure control device based on a dialysis-denitrification process connected to the alkaline outlet end of a percolation distillation unit.

[0026] Figure 2 This is a top view of the pressure regulating rotating component.

[0027] Figure 3 This is a three-dimensional schematic diagram of the impeller. Detailed Implementation

[0028] The following detailed description illustrates the specific implementation methods:

[0029] The reference numerals in the accompanying drawings include: inlet pipe 100, permeation distillation assembly 101, alkali outlet pipe 102, liquid collection shell 103, drain pipe 104, support frame 105, shell 106, pressure regulating rotating component 107, liquid passage hole 108, impeller 109, blade 110, pressure boosting section 111, pressure releasing section 112, and pressure stabilizing section 113.

[0030] Example 1

[0031] The basics are as follows: Figures 1-3 As shown: A pressure control device based on dialysis-denitrification process is applied to a wastewater treatment system based on dialysis-denitrification disclosed in Chinese Patent Application Publication No. CN116693106A. The pressure control device based on dialysis-denitrification process in this embodiment includes a pressure-regulating unit, which includes a housing 106, a pressure-regulating rotating component 107, and a drive unit for driving the pressure-regulating rotating component 107 to rotate. The housing 106 has a chamber, and the pressure-regulating rotating component 107 is rotatably disposed in the chamber. The two side walls of the pressure-regulating rotating component 107 are in contact with the two side inner walls of the chamber.

[0032] The pressure regulating rotating component 107 can be either disc-shaped or disc-shaped, with the disc-shaped component having a thinner thickness than the disc-shaped component. In this embodiment, the interior of the housing 106 is circular, matching the shape of the pressure regulating rotating component 107. The upper and lower sides of the pressure regulating rotating component 107 are respectively attached to and slidably fitted with the upper and lower sides of the inner wall of the cavity.

[0033] Combination Figure 2As shown, the pressure regulating rotating component 107 is provided with a liquid passage hole 108. In this embodiment, the liquid passage 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 and are connected in sequence 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 the width of the pressure stabilizing section 113, which is greater than the width of the pressure boosting section 111. The center of the ring is the same as the rotation center of the pressure regulating rotating component.

[0034] The upper side of the housing 106 is provided with an inlet for connection to the percolation distillation assembly 101. The inlet is connected to the alkali solution outlet pipe 102 of the percolation distillation assembly 101. An outlet is provided on the other side. The inlet and outlet are opposite to and connected to each other through a liquid passage 108. The diameter of the outlet is greater than or equal to the diameter of the inlet. In this embodiment, the diameter of the outlet is equal to the diameter of the inlet, and they have the same shape. Figure 2 As shown, the inlet is partially blocked by the pressure regulating rotating component. At the same time, the area of ​​the pressure regulating rotating component blocking the inlet at the pressure boosting section 111 is greater than the area of ​​the pressure regulating rotating component blocking the inlet at the pressure stabilizing section 113 is greater than the area of ​​the pressure regulating rotating component blocking the inlet at the pressure relief section 112.

[0035] Combination Figure 1 As shown, the drive unit includes a rotating impeller 109, which 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 component 107 are coaxially and fixedly connected.

[0036] In addition, to prevent the liquid flowing out of the outlet from spreading, this pressure control device based on the dialysis-denitrification process also includes a liquid collection shell 103. The shell 106 of the pressure-holding unit is connected to the liquid collection shell 103 via a support frame 105. A drain pipe 104 is connected to the liquid collection shell 103, which is used to connect to the alkali tank. The alkali outlet pipe 102 of the percolation distillation assembly 101 passes through the side wall of the liquid collection shell 103 and enters the liquid collection shell 103.

[0037] In practical use, the pressure control device based on the dialysis-denitrification process of this application is set between the perhydration distillation component 101 and the alkali tank. The liquid in the alkali tank flows to the Daonan dialysis component. After the liquid reacts in the Daonan dialysis component, it enters the perhydration distillation component 101 through the inlet pipe 100. The reaction occurs in the perhydration distillation component 101. After the reaction, the liquid enters the shell 106 through the alkali outlet pipe 102 and the inlet, and flows out from the outlet through the liquid passage hole 108. The liquid flowing out from the outlet enters the liquid collection shell 103 and is discharged from the drain pipe 104. The discharged liquid enters the alkali tank, thus completing the entire cycle.

[0038] The liquid flowing out of the outlet impacts the blades 110 on the impeller 109. Since the blades 110 are inclined, the impeller 109 rotates under the impact of the liquid. The impeller 109 drives the pressure regulating rotating component 107 in the housing 106 to rotate. Different parts of the liquid passage hole 108 on the pressure regulating rotating component 107 pass through the liquid inlet in sequence.

[0039] Combination Figure 2 As shown, when the pressure stabilizing section 113 passes the inlet, the outflow velocity of the liquid from the alkali outlet pipe 102 in the percolation component 101 is the same as the liquid flow velocity entering the percolation component 101 from the inlet pipe 100. The pressure in the percolation component 101 is basically the same as the pressure in the prior art without this device installed. When the pressure boosting section 111 rotates to the inlet, the inlet is blocked more by the pressure regulating rotating component 107. At this time, the outflow velocity of the liquid from the inlet through the liquid passage hole 108 to the outlet hole slows down. At this time, the outflow velocity of the liquid in the percolation component 101 is less than the inflow velocity, the liquid in the percolation component 101 gradually accumulates, and the pressure in the percolation component 101 gradually increases slowly, thereby achieving pressure boosting.

[0040] Combination Figure 2 As shown, when the pressure relief section 112 of the liquid inlet 108 rotates to the liquid inlet, the degree of obstruction at the liquid inlet decreases (less than the degree of obstruction in the stabilizing section). At this time, the liquid outflow velocity in the percolation component 101 is greater than the liquid inflow velocity, thus starting to slowly release pressure and gradually release the pressure in the percolation component 101 to avoid excessive pressure. Finally, the pressure is completely released, and the pressure difference across the membrane of the percolation component 101 basically returns to the initial state without this device (the pressure difference across the membrane of the percolation component 101 is not much different from the initial pressure difference without this device, and is the same as or slightly lower than the initial pressure difference). At this time, the pressure stabilizing section 113 rotates back to the liquid inlet to stabilize the pressure (the pressure in the percolation component 101 neither rises nor falls).

[0041] By repeatedly performing the above process, the pressure inside the percolation distillation module 101 can be continuously increased and decreased. The pressure increase and decrease processes are slow and require a certain amount of time to complete. During the pressure increase and decrease, the pressure on the alkali side of the percolation distillation module 101 is always higher than the alkali side pressure in existing percolation distillation modules 101, which is beneficial for the flow of ammonia to the acid side of the percolation distillation module 101. At the same time, the pressure increase and decrease processes are gentle, with a small pressure increase (0.01-0.05 MPa, specifically a pressure difference of 0.02 MPa across the membrane of the percolation distillation module 101), minimizing the impact on the internal membrane of the percolation distillation module 101 and the Daonan dialysis module.

[0042] In other embodiments, the outlet can be partially aligned with the blade 110. This prevents the outlet from being completely opposite the blade 110, thus reducing the impact of the liquid flowing out of the outlet on the blade 110, lowering the rotational speed of the impeller 109, and consequently lowering the rotational speed of the pressure regulating rotor 107. This ensures that the pressure regulating rotor 107 does not rotate too fast, guaranteeing that the pressurization and depressurization have a certain duration.

[0043] Of course, in other embodiments, a flow divider (not shown in the figure) can also be connected to the liquid outlet. By setting the flow divider, the flow divider can divert the liquid flowing out of the liquid outlet, so that a portion of the liquid flowing out of the liquid outlet will not impact the blade 110, and only a portion of the liquid will impact the blade 110, thereby reducing the rotational speed of the impeller 109.

[0044] Of course, in other embodiments, the rotational speed of the impeller 109 can also be changed by adjusting the tilt angle of the blade 110, thereby changing the impact force on the blade 110.

[0045] Example 2

[0046] This embodiment discloses a drive unit with an alternative structure. The drive unit in this embodiment does not use structures such as the impeller 109; instead, it includes a motor (not shown in the figure). The motor's output shaft and the pressure regulating rotating component 107 are coaxially connected. Therefore, the pressure regulating rotating component 107 is driven to rotate by the motor, eliminating the need for liquid impact to drive its rotation. Since the motor only needs to drive the pressure regulating rotating component 107, its power does not need to be high. Furthermore, to ensure slow rotation of the pressure regulating rotating component 107, a speed reducer can be connected between the motor and the component, allowing the motor to drive the component 107 to rotate slowly.

[0047] By adopting the method in this embodiment, the liquid collection shell 103 structure can be eliminated, and the liquid outlet can be directly connected to the alkali tank through a pipeline.

[0048] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described 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 device includes a pressure-regulating unit, which comprises a housing, a pressure-regulating rotating component, and a drive unit for driving the pressure-regulating rotating component to rotate. The housing has a chamber, and the pressure-regulating rotating component is rotatably disposed in the chamber. The two side walls of the pressure-regulating rotating component are in contact with the two side inner walls of the chamber. The pressure regulating rotating component is provided with a liquid passage hole, which includes a pressure stabilizing section, a pressure increasing section, and a pressure releasing section. The pressure stabilizing section, the pressure increasing section, and the pressure releasing section are all arc-shaped and are connected in sequence to form a ring. The pressure stabilizing section is located between the pressure increasing section and the pressure releasing section. The width of the pressure releasing section is greater than the width of the pressure stabilizing section, which is greater than the width of the pressure increasing section. The center of the ring is the same as the rotation center of the pressure regulating rotating component. One side of the housing is provided with an inlet for connection with the permeation distillation assembly, and the other side is provided with an outlet. The inlet and outlet are located on both sides of the liquid passage and are connected to each other through the liquid passage. The liquid inlet is partially blocked by the pressure regulating rotating component. The area of ​​the pressure regulating rotating component blocking the liquid inlet in the pressure boosting section is greater than that in the pressure stabilizing section, which is greater than that in the pressure relief section. The drive unit includes a rotating impeller, with the impeller blades and the liquid outlet facing each other; The outlet portion is opposite to the blade; a flow divider is connected to the outlet; the outlet diameter is greater than or equal to the inlet diameter; the impeller is located below the housing.

2. The pressure control device based on dialysis-denitrification process according to claim 1, characterized in that: It also includes a liquid collection shell, in which the pressure-holding unit is located, and a drain pipe is connected to the liquid collection shell.

3. A system, characterized in that: It includes an alkali tank, a Daonan dialysis assembly, a pervaporation assembly, and a pressure control device based on a dialysis-denitrification process as described in any one of claims 1-2; the pressure control device for the dialysis-denitrification process is installed between the pervaporation assembly and the alkali tank.

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