Slag-water separation sewage treatment recycling system

Abstract

The invention relates to the technical field of sewage treatment, and discloses a slag-water separation sewage treatment recycling system which comprises a circulating water container and a cyclone desander, sewage is conveyed to the conical cyclone desander through a pneumatic diaphragm pump, and sand-water separation is achieved through high-speed cyclone; purified water enters the circulating water container for temporary storage through a top water outlet. The system adopts an integrated design, the cyclone desander operates independently, the complex structure of'container-in-container 'is avoided, and a closed loop of power, separation, slag storage and clear water recovery is formed. Circulating water can be directly supplied to high-pressure grinding equipment to be used, online recycling of water resources is achieved, and consumption of fresh water and discharge of waste water are reduced. The pneumatic diaphragm pump has the advantages of strong self-absorption, wear resistance, adjustable flow and the like, is suitable for conveying high-solid-content sewage, solves the problem that a traditional pump is easy to block and damage, and guarantees stable operation of a system. The system integrates efficient separation, water saving, environmental protection and long-term reliability, and is suitable for industrial sewage circulation treatment.

Description

Technical Field

[0001] This solution relates to the field of wastewater treatment technology, specifically to a wastewater treatment and recycling system for slag-water separation. Background Technology

[0002] Traditional machining methods, when processing high-hardness materials or complex irregular parts, are prone to problems such as rapid tool wear, low machining accuracy, and thermal deformation, making it difficult to meet the stringent requirements for workpiece surface quality and machining precision in fields such as aerospace and automotive manufacturing. Abrasive jet machining, with its advantages of non-contact, cold-processing, can achieve high-precision cutting, rust removal, and polishing by controlling the jet pressure. However, the wastewater generated after abrasive jet machining limits its development. For example, in high-pressure abrasive waterjet cutting, each machine... Every hour, 1-3 tons of sand-water mixture are generated and discharged as wastewater. Its composition includes: abrasive particles (garnet, alumina, etc.), abrasive chips, cutting chips (metal and non-metal fragments, etc.), colloidal impurities (grease, suspended solids, etc.) and water-based carriers (containing dissolved salts and fine particles). If discharged directly without treatment, it will cause blockage of municipal pipelines, and even damage the ecological environment, causing problems such as eutrophication and heavy metal pollution of water bodies, and a large amount of water resources will be wasted. At the same time, in the sand-water mixture, the abrasive particles that can be recycled and reused account for about 60% of the abrasive input. Summary of the Invention

[0003] This invention aims to provide a slag-water separation and wastewater treatment recycling system for treating wastewater generated during abrasive jet processing and reusing the treated wastewater. To achieve the above objectives, the present invention adopts the following technical solution: a wastewater treatment and recycling system for slag-water separation, comprising a circulating water container and a filtration unit. The circulating water container is used to store the recycled water treated by the filtration unit. The filtration unit includes a hydrocyclone sand separator, which has a conical structure with a drain outlet at the center of the top, a feed inlet at the top side, and a sand discharge outlet at the bottom. The feed inlet of the hydrocyclone sand separator is connected to a pneumatic diaphragm pump and is connected to the wastewater through the pneumatic diaphragm pump. The wastewater is input into the hydrocyclone sand separator through the pneumatic diaphragm pump, and a high-speed vortex is generated under the action of the hydrocyclone sand separator. The sand and gravel in the wastewater are separated by the high-speed vortex to obtain clean water. The clean water is discharged into the circulating water container for temporary storage through the drain outlet, and the sand particles are discharged through the sand discharge outlet.

[0004] The beneficial effects of this solution are as follows: In this solution, the hydrocyclone sand separator is used as the core separation component. It adopts an integrated conical structure, which does not need to be nested in other containers. It can directly realize feeding, sand discharge and drainage through its own port, avoiding the cumbersome design of "container inside container". This forms an integrated closed loop from the pneumatic diaphragm pump (power source) to the hydrocyclone sand separator (separation core) and then to the sand storage tank (solid slag collection), while also being compatible with the physical closed loop system of the circulating water container (clean water recovery). Meanwhile, the treated clean water is temporarily stored in a circulating water container. When the high-pressure abrasive equipment needs water, the clean water stored in the circulating water container can be used directly, which reduces the use of water resources and avoids the damage to the environment caused by sewage discharge. This forms a water circulation loop in the system, allowing the treated clean water to be reused directly. This realizes the online recycling and reuse of water resources, greatly reduces the consumption of fresh water and the discharge of wastewater, and reflects the core innovative value of resource conservation and environmental friendliness. In addition, this solution uses a pneumatic diaphragm pump to transport sewage to the cyclone sand separator. The pneumatic diaphragm pump has strong self-priming ability, can transport media with high solid content, is wear-resistant, and its flow rate can be easily adjusted by air pressure. It is perfectly suited to the requirements of the cyclone sand separator for feed pressure and flow rate, which solves the pain points of traditional pumps that are prone to clogging and wear, and ensures the long-term stable operation of the system.

[0005] Furthermore, the axis of the feed inlet is parallel to the tangent of the cone structure; a sand storage box is installed directly below the cyclone sand separator, which is perpendicular to the sand discharge port and is used to collect the separated sand particles; the drain outlet of the cyclone sand separator is connected to the circulating water container to form a closed loop for wastewater treatment.

[0006] Beneficial effects: The design of the feed inlet axis is parallel to the tangent of the cone structure. After being pressurized, the wastewater enters tangentially from the side of the cyclone separator to the top feed inlet. This inflow method directly induces a high-speed rotating flow field under the constraint of the vessel wall, maximizing the conversion of the initial kinetic energy of the fluid into rotational kinetic energy, significantly enhancing the centrifugal separation effect and reducing energy loss. At the same time, under the strong swirling flow field and optimized turbulent state, efficient self-organized separation is achieved: heavy sand particles move rapidly spirally downward along the cone wall to the sand discharge port under the combined action of centrifugal force and the vessel wall effect; the separated clean water converges towards the axis in the low-pressure core area and moves upward to be discharged from the top drain outlet.

[0007] Furthermore, the sand discharge port is equipped with an electrically controlled valve, and the pneumatic diaphragm also includes a pressure reducer. The air inlet of the pressure reducer is equipped with a filter, and compressed air is connected through the filter.

[0008] Beneficial effects: By setting the sand storage box vertically directly below the sand discharge port of the hydrocyclone, and combining it with the precise opening and closing of the electrically controlled valve, the directional, leak-free, gravity-fed collection of separated sand particles is achieved, simplifying the structure and reducing the risk of secondary pollution.

[0009] Furthermore, the pneumatic diaphragm pump is connected to the feed pipe, and the feed pipe is connected to the inlet of the cyclone separator via quick-release flanges. By using quick-release flanges to connect the pneumatic diaphragm pump to the feed pipe, and the feed pipe to the inlet of the cyclone separator, the assembly and disassembly of the pneumatic diaphragm pump are made quicker, reducing the difficulty of subsequent maintenance and the workload of installation and disassembly.

[0010] Furthermore, the feed pipe has a variable diameter streamlined structure.

[0011] Furthermore, the flow of wastewater within the cyclone sand separator is described by the RANS equations, and the flow field is controlled by a turbulence model.

[0012] Furthermore, the RANS equations are as follows: (1) In the formula, For velocity vectors, wave components This is a derived expression for the velocity vector. Let ρ be the Reynolds number stress of the fluid, and ρ be the density of the fluid.

[0013] Furthermore, the mathematical expression for the turbulence model is as follows: (2) (3) In the formula, k is the turbulent kinetic energy, in J; The dissipation rate is expressed in J / s. This is the interlayer viscosity coefficient; The turbulent viscosity coefficient; This refers to the turbulent kinetic energy generated by velocity. The turbulent kinetic energy generated by buoyancy; The wave energy generated by compressible turbulent kinetic energy; The wave energy generated by compressible turbulent kinetic energy; , , For empirical constants, For source terms; Formula (2) is the turbulent kinetic energy equation, and formula (3) is the turbulent dissipation rate equation. Attached Figure Description

[0014] Figure 1 This is a three-dimensional view of the slag removal unit in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram illustrating the wastewater treatment principle of an embodiment of the present invention.

[0015] The reference numerals in the accompanying drawings include: cyclone sand separator 110, drain outlet 111, water inlet 112, sand discharge outlet 113, solenoid valve 114, pneumatic diaphragm pump 120, pressure reducer 121, filter 122, frame 130, sand storage tank 140, isolation plate 141, and drain outlet 142. Detailed Implementation

[0016] Example 1 Example 1 is basically as shown in the appendix. Figure 1 As shown, Figure 1 The wastewater treatment and recycling system shown includes a circulating water container and a filtration unit. The circulating water container is used to store the recycled water after it has been treated by the filtration unit.

[0017] like Figure 1 As shown, the filtration unit includes a frame 130, on which a cyclone sand separator 110 and a pneumatic diaphragm pump 120 are fixed by bolts. The top center of the cyclone sand separator 110 is provided with a drain port 111 that communicates with the circulating water container, and a feed port that communicates with the start-up diaphragm pump is provided on the side top. The bottom is provided with an expansion section, and the expansion section is provided with a sand discharge port 113. The pneumatic diaphragm pump 120 is connected to the feed pipe, and the feed pipe is connected to the feed port of the cyclone sand separator 110 through quick-release flanges. The sand discharge port 113 is equipped with an electrically controlled valve, and the pneumatic diaphragm air inlet is equipped with a pressure reducer 121. The pressure reducer 121 is equipped with a filter 122, and compressed air is connected through the filter 122. During operation, the compressed air is filtered by the filter 122 and enters the pneumatic diaphragm pump 120 under the control of the pressure reducer 121, driving the pneumatic diaphragm pump 120 to run, thereby pumping sewage into the cyclone sand separator 110. A feed pipe is provided between the outlet of the pneumatic diaphragm pump 120 and the feed inlet of the cyclone sand separator 110, and the outlet of the pneumatic diaphragm pump 120 is connected to the feed inlet of the cyclone sand separator 110 through the feed pipe, thereby providing power for sewage extraction and transportation through the pneumatic diaphragm pump 120. The drain port 111 of the cyclone sand separator 110 is connected to the circulating water container to form a closed loop for sewage treatment.

[0018] During operation, under the action of the pneumatic diaphragm pump 120, such as Figure 2As shown, wastewater enters the cyclone separator 110 tangentially through the inlet. Under the action of the inner wall of the cyclone separator 110, a high-speed rotating flow field is induced, and the initial kinetic energy of the fluid is converted into rotational kinetic energy, thereby generating centrifugal force. Under the action of centrifugal force, the sand and gravel contained in the wastewater are gradually separated and fall into the expansion section for temporary storage under the action of gravity. The purified water after the sand and gravel separation is discharged into the circulating water container for sedimentation through the outlet. After sedimentation and filtration in the circulating water container, the purified water can be used as a water-based carrier for reuse by the abrasive jet processing equipment to achieve zero wastewater discharge in abrasive jet processing. This solution does not restrict the filtration and reuse of purified water. For example, a lift pump is set between the circulating water container and the abrasive jet processing equipment. A filter screen is fixed at the inlet of the lift pump, so that the fine sand contained in the purified water is filtered again through the filter screen, and the filtered purified water is input into the abrasive jet processing equipment for reuse by the lift pump.

[0019] A sand storage box 140 for collecting separated sand particles is provided directly below the cyclone sand separator 110. The sand storage box 140 is perpendicular to the sand discharge port 113. In this embodiment, there are no restrictions on the connection between the sand storage box 140 and the frame 130. The sand storage box 140 can be placed on the frame 130, welded to the frame 130, or fixedly connected to the frame 130 by bolts.

[0020] After running for a period of time, the sand discharge port 113 is opened by the electrically controlled valve, allowing the sand temporarily stored in the expanded part to fall freely into the sand storage box 140 for storage. When a certain amount of sand is stored in the sand storage box 140, the sand stored in the sand storage box 140 can be processed to recover reusable abrasive particles from the sand. In this embodiment, the processing method of the sand is not limited. For example, a certain amount of water can be added and stirred to make the sand and water mix evenly and settle naturally. By utilizing the buoyancy of water and the density difference of different substances in the sand, the abrasive particles (garnet, alumina, etc.), abrasive debris, and cutting debris (metal, non-metal fragments, etc.) will be stratified to achieve the collection of reusable abrasive particles.

[0021] Example 2 Example 2 is basically the same as Example 1, except that in this example, the cyclone separator 110 has a conical structure and the feed pipe has a variable diameter streamlined structure. Specifically, the pipe diameter of the cyclone separator 110 gradually decreases from the drain outlet 111 to the expansion section, and the pipe diameter of the feed pipe gradually decreases from the outlet of the pneumatic diaphragm pump 120 to the feed inlet of the cyclone separator 110. This gradually increases the flow velocity of the sewage, allowing for better utilization of the sewage flow velocity within the cyclone separator 110. When the sewage enters the cyclone separator 110 through the inlet 112, it forms a vortex under the action of the pipe wall of the cyclone separator 110, and the rotation radius of the vortex gradually decreases, thereby gradually increasing the centrifugal force and improving the sand removal effect of the cyclone separator 110.

[0022] Meanwhile, an isolation plate 141 is fixed inside the sand storage tank 140. The isolation plate 141 is provided with several filter holes, the diameter of which is smaller than the particle size of the abrasive. A drain port 142 is welded on the side wall between the bottom plate of the sand storage tank and the isolation plate 141. Through the setting of the isolation plate 141 and the drain port 142, the abrasive particles and metal debris temporarily stored in the sand storage tank can be directly separated into solid and liquid during operation, or the abrasive particles and metal debris temporarily stored in the sand storage tank can be directly cleaned with cleaning fluid. This dissolves the grease in the colloidal impurities (grease, suspended matter, etc.) and carries away the smaller abrasive debris and cutting debris (metal, non-metal fragments, etc.), thereby improving the cleanliness of the abrasive particles and metal debris temporarily stored in the sand storage tank and further reducing the humidity of the abrasive particles and metal debris temporarily stored in the sand storage tank, thus reducing the difficulty of recycling and separation in the subsequent recycling process.

[0023] Example 3 Based on Example 1, the flow of sewage in the cyclone sand separator 110 is described by the RANS equation, and the flow field is controlled by a turbulence model.

[0024] Specifically, the RANS equation is as follows: (1) In the formula, For velocity vectors, wave components This is a derived expression for the velocity vector. Let ρ be the Reynolds number stress of the fluid, and ρ be the density of the fluid.

[0025] The mathematical expression for the turbulence model is as follows: (2) (3) In the formula, k is the turbulent kinetic energy, in J; The dissipation rate is expressed in J / s. This is the interlayer viscosity coefficient; The turbulent viscosity coefficient; This refers to the turbulent kinetic energy generated by velocity. The turbulent kinetic energy generated by buoyancy; The wave energy generated by compressible turbulent kinetic energy; The wave energy generated by compressible turbulent kinetic energy; , , For empirical constants, For source terms; Formula (2) is the turbulent kinetic energy equation, and formula (3) is the turbulent dissipation rate equation.

[0026] 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 the technical means for solving problems in the above embodiments of the present invention can be used in combination to solve multiple technical problems simultaneously. For those skilled in the art, several modifications and improvements can be made 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 slag-water separation and wastewater treatment recycling system, characterized in that: The system includes a circulating water container and a filtration unit. The circulating water container stores the recycled water treated by the filtration unit. The filtration unit includes a hydrocyclone sand separator, which has a conical structure with a drain outlet at the top center, a feed inlet at the top side, and a sand discharge outlet at the bottom. The feed inlet of the hydrocyclone sand separator is connected to a pneumatic diaphragm pump, which is connected to the sewage. The sewage is fed into the hydrocyclone sand separator by the pneumatic diaphragm pump, where a high-speed vortex is generated. The high-speed vortex separates the sand and gravel in the sewage to obtain clean water. The clean water is discharged into the circulating water container for temporary storage through the drain outlet, while the sand particles are discharged through the sand discharge outlet.

2. The slag-water separation and wastewater treatment recycling system according to claim 1, characterized in that: The axial direction of the feed inlet is parallel to the tangent of the cone structure; a sand storage box is set directly below the cyclone sand separator, which is perpendicular to the sand discharge port and is used to collect the separated sand particles; the drain outlet of the cyclone sand separator is connected to the circulating water container to form a closed loop for wastewater treatment.

3. The slag-water separation and wastewater treatment recycling system according to claim 2, characterized in that: The sand discharge port is equipped with an electrically controlled valve, and the pneumatic diaphragm also includes a pressure reducer. The air inlet of the pressure reducer is equipped with a filter, and compressed air is connected through the filter.

4. The slag-water separation and wastewater treatment recycling system according to claim 3, characterized in that: The pneumatic diaphragm pump is connected to the feed pipe, and the feed pipe is connected to the feed inlet of the cyclone separator via quick-release flanges.

5. The slag-water separation and wastewater treatment recycling system according to claim 4, characterized in that: The feed pipe has a variable diameter streamlined structure.

6. The slag-water separation and wastewater treatment recycling system according to claim 5, characterized in that: The flow of wastewater inside the cyclone sand separator is described by the RANS equations, and the flow field is controlled by a turbulence model.

7. A slag-water separation and wastewater treatment recycling system according to claim 6, characterized in that: The RANS equations are as follows: （1） In the formula, For velocity vectors, wave components This is a derived expression for the velocity vector. Let ρ be the Reynolds number stress of the fluid, and ρ be the density of the fluid.

8. The slag-water separation and wastewater treatment recycling system according to claim 6, characterized in that: The mathematical expression for the turbulence model is as follows: （2） （3） In the formula, k is the turbulent kinetic energy, in J; The dissipation rate is expressed in J / s. This is the interlayer viscosity coefficient; The turbulent viscosity coefficient; This refers to the turbulent kinetic energy generated by velocity. The turbulent kinetic energy generated by buoyancy; The wave energy generated by compressible turbulent kinetic energy; The wave energy generated by compressible turbulent kinetic energy; , , For empirical constants, For source terms; Formula (2) is the turbulent kinetic energy equation, and formula (3) is the turbulent dissipation rate equation.

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