Pressurized Turbid Water Purification Device and Purification Method

Abstract

The application provides a pressure type turbid circulating water purification device and purification method, and belongs to the technical field of turbid circulating water treatment. The device comprises a shell, a sludge collecting device, a cyclone coagulation device, a sludge backflow guide cone and a filler sedimentation separation layer which are sequentially arranged in the internal space of the shell from bottom to top. The cyclone coagulation device comprises a water inlet guide cylinder and a guide ring plate arranged at the bottom port of the water inlet guide cylinder. A water inlet pipe is connected to the tangent direction of the water inlet guide cylinder. The top of the sludge backflow guide cone is upwardly arranged, and the bottom end of the sludge backflow guide cone is arranged at the top end of the water inlet guide cylinder. A water outlet chamber is formed above the filler sedimentation separation layer. A water outlet pipe is arranged in the water outlet chamber. The application can solve the problems in the prior art, such as the large local resistance loss and high equipment operation energy consumption caused by the sludge backflow relying on the Venturi tube structure to suck the sludge in the high concentration area, the large structure wear of the sludge backflow part, the influence on the service life of the device and the like.

Description

Technical Field

[0001] This invention relates to the field of turbid circulating water treatment technology, and more specifically, to a pressurized turbid circulating water purification device and purification method. Background Technology

[0002] The treatment process for turbid circulating water in the iron and steel metallurgical industry is generally based on physicochemical methods, including physical and chemical treatment methods such as coagulation, flocculation, clarification, and sedimentation. Therefore, technological innovation around coagulation, flocculation, clarification, and sedimentation, and the development of efficient physicochemical treatment technologies for flocculation and sedimentation, are the key to improving the efficiency of wastewater physicochemical treatment, and are also the current research challenge in the industry.

[0003] Traditional water treatment processes separate coagulation, flocculation, clarification, and sedimentation into different process equipment or structures. During the chemical coagulation reaction, mechanical stirring is typically used, consuming energy. To improve flocculation and clarification, whether internal or external sludge recirculation is used, additional sludge recirculation equipment is required, also consuming energy. Wastewater enters a traditional atmospheric pressure physiochemical treatment unit via a primary lift, but the purified effluent is depressurized, resulting in insufficient utilization of the primary lift pump's residual energy. The effluent from the atmospheric pressure physiochemical purification unit needs to flow into a suction tank, and then undergo a secondary lift by the pump set before entering a cooling tower or subsequent treatment equipment; this process also consumes additional electricity for the secondary lift.

[0004] Addressing the issues of large land area, high investment, high energy consumption, and high operating costs associated with traditional water treatment processes, our company pioneered a pressurized integrated metallurgical wastewater purification technology, which has been widely adopted in the steel industry. The core concept of this technology is to unify the entire process of turbid circulating water purification within a closed, pressurized structure. The effluent is directly cooled by a cooling tower, reducing secondary pumping compared to traditional water treatment processes. This not only lowers the land area and investment required for the project but also significantly reduces energy consumption, lowering the operating costs of the water treatment facility. This technology integrates flocculation and sedimentation technologies into a single unit and enables sludge recycling within the equipment, improving reagent utilization and flocculation / sedimentation effects. This results in a significant improvement in effluent quality compared to traditional processes, achieving a more sophisticated approach to water treatment facilities while reducing land area requirements. Based on this technology, various styles of pressurized integrated metallurgical wastewater purification devices have been developed on the market, but their fundamental principles remain largely unchanged.

[0005] Sludge recirculation within pressurized integrated equipment is a crucial means of achieving efficient water purification. However, current technologies generally rely on the Venturi effect for passive sludge recirculation. Since the sludge solids formed during the purification of turbid circulating water have a specific gravity exceeding 5, achieving sludge recirculation using a Venturi tube requires a high negative pressure, necessitating a high flow velocity in the constriction section. Under high flow velocity conditions, the local resistance loss in the constriction section increases, potentially offsetting the energy savings from secondary lifting compared to traditional processes. Furthermore, the constriction section, constantly exposed to high flow velocity and high concentrations of iron oxide particles, is prone to wear. With prolonged use, once the constriction section is worn through, the entire equipment loses its sludge recirculation function, reducing purification efficiency.

[0006] For example, patent application number CN201010605762.6 discloses a pressurized integrated metallurgical wastewater purification and treatment device. In the technical solution provided by this patent, sludge recirculation occurs in a hydraulic circulation clarification chamber, which is equipped with a set of nozzles and a throat. The contraction of the nozzles creates a high flow velocity, inducing a negative pressure within the throat, drawing surrounding sludge into the throat and forming sludge recirculation. Due to the high flow velocity at the nozzles, significant resistance loss occurs, and wear is exacerbated. This defect increases the energy consumption of the equipment and affects its service life.

[0007] For example, patent application number CN201820993898.0 discloses a pressure-bearing purification device. In the technical solution provided by this patent, sludge return occurs in the sludge hopper, which is equipped with two sets of nozzles and throats. The contraction of the nozzles generates a high flow velocity, which induces a negative pressure in the throat to draw the sludge in the sludge hopper into the throat and form sludge return here. Similarly, due to the high flow velocity at the nozzle, two resistance losses are generated here, and wear occurs in each set of Venturi tubes. This defect increases the energy consumption of the equipment and affects its service life. Furthermore, in this patented technology, the influent enters the flocculation reaction zone through two sets of Venturi tubes. Here, the reagent first enters the mixing and coagulation zone from top to bottom, and then flows into the flocculation reaction zone through a deflection. Since the water flows from top to bottom in the mixing and coagulation zone, the porous circular hollow stirring packing in the mixing and coagulation zone is actually subjected to vertical extrusion force, which is actually static mixing with very weak stirring force. Pollutants in the water are easy to settle and clog the packing balls. Therefore, the reaction force in the mixing and coagulation zone is weak, and the reagent and pollutants in the water cannot fully contact each other. To obtain larger flocs, only a large amount of flocculant can be added. The large reagent consumption is also a disadvantage of this technology.

[0008] In summary, existing pressurized integrated metallurgical wastewater purification technologies suffer from problems such as high local resistance loss, high energy consumption during equipment operation, and significant structural wear on the sludge return section, which affects the service life of the equipment, because sludge return generally relies on a venturi tube structure to pump sludge from high-concentration areas. Summary of the Invention

[0009] In view of the above problems, the purpose of this invention is to provide a pressurized turbid water purification device and purification method to solve the problems of existing pressurized integrated metallurgical wastewater purification technology, which generally relies on the Venturi tube structure to suck up sludge from high-concentration areas for sludge return, resulting in large local resistance loss, high energy consumption during equipment operation, and large structural wear on the sludge return section, affecting the service life of the device.

[0010] This invention provides a pressurized circulating water purification device, comprising a shell, and, from bottom to top, a sludge collection device, a vortex coagulation device, a sludge return guide cone, and a packing sedimentation separation layer arranged within the shell's internal space. The vortex coagulation device includes an inlet guide cylinder and a guide ring plate disposed at the bottom port of the inlet guide cylinder. An inlet pipe is connected tangentially to the inlet guide cylinder. The guide ring plate is disposed above the sludge inlet of the sludge collection device. The sludge return guide cone has its apex facing upwards, and its bottom end is disposed at the top of the inlet guide cylinder. An outlet chamber is formed above the packing sedimentation separation layer. An outlet pipe is disposed in the outlet chamber.

[0011] In addition, a preferred embodiment includes an automatic sludge discharge control mechanism; wherein the automatic sludge discharge control mechanism includes an automatic sludge discharge valve disposed at the sludge discharge port of the sludge collection device, a sludge level gauge disposed on the sludge collection device, and a main control mechanism connected to the automatic sludge discharge valve and the sludge level gauge.

[0012] Furthermore, a preferred embodiment is that an automatic sludge discharge pipe is connected to the sludge discharge port of the sludge collection device; the discharge outlet of the automatic sludge discharge pipe passes through the side wall of the housing and is located outside the housing; and the automatic sludge discharge valve is installed on the automatic sludge discharge pipe.

[0013] Furthermore, a preferred embodiment further includes a sludge flushing device; wherein the sludge flushing device includes a sludge flushing ring pipe disposed above the sludge inlet of the sludge collection device and a nozzle disposed at the bottom of the sludge flushing ring pipe; the sludge flushing ring pipe is disposed around the lower outer periphery of the guide ring plate; a flushing water inlet pipe is connected to the water inlet of the sludge flushing ring pipe; the water inlet end of the flushing water inlet pipe passes through the side wall of the housing and is disposed outside the housing; an automatic flushing valve is disposed on the flushing water inlet pipe; the automatic flushing valve is signal connected to the main control mechanism.

[0014] Furthermore, a preferred embodiment is that the sludge collection device is a sludge hopper with an inverted conical structure; the top opening of the sludge hopper is fitted against the inner wall of the outer shell.

[0015] Furthermore, in a preferred embodiment, the outer shell is a pressure-bearing and sealed space structure formed by the shell and the end cap disposed at the top of the shell; the water outlet pipe is disposed at the top of the end cap; and an automatic water outlet valve is provided on the water outlet pipe.

[0016] In addition, a preferred embodiment is that the outer wall of the water inlet guide tube is fixed to the inner wall of the outer shell by a fixing connector; the lower end of the guide ring plate is inclined inward.

[0017] Furthermore, in a preferred embodiment, the inlet end of the water inlet pipe passes through the side wall of the outer casing and is located outside the outer casing; an automatic water inlet valve is provided on the water inlet pipe.

[0018] Furthermore, in a preferred embodiment, the packing sedimentation separation layer includes a packing support and inclined tube packing or inclined plate packing disposed on top of the packing support; the outer peripheral end of the packing support is disposed in contact with the inner side wall of the outer shell; and or, the bottom end of the sludge return guide cone is flush with the top end of the inlet guide cylinder.

[0019] This invention provides a method for purifying turbid circulating water, which uses a pressurized turbid circulating water purification device as described above to purify the turbid circulating water, and includes the following steps:

[0020] Step S1: The turbid circulating water to be treated enters the inlet guide tube through the inlet pipe along the tangential direction of the inlet guide tube, causing the water flow in the inlet guide tube to form a swirling flow;

[0021] Step S2: Under the action of the swirling flow, some of the coarse solid particles in the turbid circulating water to be treated are separated by centrifugation and fall from the bottom of the inlet guide tube into the sludge collection device; the turbid circulating water to be treated that has passed over the guide ring plate in the inlet guide tube flows upward along the cavity between the inlet guide tube and the inner side wall of the outer shell and enters the packing sedimentation separation layer.

[0022] Step S3: The sludge in the turbid circulating water to be treated entering the packing sedimentation separation layer is intercepted by the packing sedimentation separation layer to achieve sludge-water separation. The sludge falls from the packing material of the packing sedimentation separation layer and is guided back to the cavity between the inlet guide tube and the inner wall of the outer shell through the sludge return guide cone. During the descent of the sludge in the cavity, it collides with the flocs in the rising water flow, capturing pollutants in the water flow. The resulting large sludge pieces and large flocs settle downwards and fall into the sludge collection device. The purified water obtained after passing through the packing sedimentation separation layer enters the outlet chamber and is discharged through the outlet pipe.

[0023] As can be seen from the above technical solution, the pressurized turbid water purification device and purification method provided by the present invention, by sequentially arranging a sludge collection device, a vortex coagulation device, a sludge return guide cone, and a packing sedimentation separation layer from bottom to top in the internal space of the outer shell, utilizes the structural design of the sludge return guide cone to guide the sludge produced after coagulation and sedimentation separation by the packing layer back into the cavity between the inlet guide cylinder and the inner wall of the outer shell by its own gravity. The sludge in the cavity comes into contact with the rising water flow in the cavity, forming a large proportion of sludge return. During the process of the falling sludge and the rising water flow coming into contact, the high-density sludge collides and aggregates with the tiny flocs in the rising water flow, forming larger flocs. Under the capture of the falling sludge and large flocs, some flocs grow fully, and their falling speed can overcome the rising water flow speed, falling into the sludge collection device. The other part is close to the rising water flow speed, forming a suspended sludge fluidized bed in the cavity, which coagulates the tiny flocs in the rising water flow, and gradually forms large particles under the coagulation promoting effect of the falling sludge and large flocs. The flocs settle downwards; the remaining flocs that have not grown sufficiently continue to flow upwards. After passing through the cavity between the inlet guide tube and the outer shell, the flow velocity decreases rapidly. Some of them fall above the sludge return guide cone to form a sludge layer, while the other part enters the packing sedimentation separation layer and is intercepted, forming large sludge particles within the packing. These sludge particles then fall above the sludge return guide cone to form a sludge layer, which then flows back to the cavity between the inlet guide tube and the outer shell. The sludge return process does not require the use of a venturi tube to draw sludge into the inlet water, eliminating the local resistance loss caused by the venturi tube in existing technologies. This reduces energy consumption in the water treatment process and avoids impacting equipment lifespan. By utilizing the tangential design of the inlet guide tube and inlet pipe, the dynamic pressure of the inlet water is converted into the power of the sewage vortex, solving the problems of insufficient reaction and low utilization rate of statically mixed agents in existing technologies. This invention can achieve full-proportion sludge return, and the agents in the returned sludge can be fully utilized by suspended solids and grease in the rising water flow, reducing the dosage of coagulants and flocculants, among other technical effects.

[0024] To achieve the foregoing and related objectives, one or more aspects of the invention include the features that will be described in detail below. The following description and accompanying drawings illustrate certain exemplary aspects of the invention. However, these aspects indicate only a few of the various ways in which the principles of the invention can be used. Furthermore, the invention is intended to encompass all such aspects and their equivalents. Attached Figure Description

[0025] Other objects and results of the invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings. In the drawings:

[0026] Figure 1This is a schematic diagram of the structure of a pressurized circulating water purification device according to an embodiment of the present invention;

[0027] Figure 2 This is a top view of the sludge flushing device according to an embodiment of the present invention;

[0028] Figure 3 for Figure 2 A schematic diagram of the structure along direction A;

[0029] Figure 4 for Figure 2 A schematic diagram of the fan-shaped nozzle during inward spraying in direction 1-1;

[0030] Figure 5 for Figure 2 A schematic diagram of the structure of the fan-shaped nozzle during vertical spraying in a 2-2 direction;

[0031] Figure 6 for Figure 2 A schematic diagram of the structure of the fan-shaped nozzle during outward spraying in a 3-3 direction;

[0032] Figure 7 This is a flowchart of a turbid circulating water purification method according to an embodiment of the present invention.

[0033] In the attached drawings, 1-outer shell, 11-shell, 12-end, 2-sludge collection device, 21-automatic sludge discharge pipe, 31-inlet guide tube, 311-fixed connector, 32-guide ring plate, 33-inlet pipe, 331-automatic inlet valve, 4-sludge return guide cone, 5-packing sedimentation separation layer, 51-packing support, 52-inclined tube packing, 6-outlet chamber, 61-outlet pipe, 611-automatic outlet valve, 71-automatic sludge discharge valve, 72-sludge level gauge, 81-sludge flushing ring pipe, 82-nozzle, 83-flushing inlet pipe, 831-automatic flushing valve.

[0034] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

[0035] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details.

[0036] In response to the aforementioned existing technologies, such as the pressurized integrated metallurgical wastewater purification technology, which relies on a Venturi tube structure to pump sludge from high-concentration areas for sludge return, resulting in high local resistance losses, high energy consumption during equipment operation, and significant structural wear on the sludge return section, thus affecting the service life of the device, a pressurized turbid water purification device and purification method are proposed.

[0037] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0038] To illustrate the pressurized turbid water purification device and purification method provided by the present invention Figure 1 The structure of a pressurized circulating water purification device according to an embodiment of the present invention is shown; Figure 2 A top view of the sludge flushing apparatus according to an embodiment of the present invention is shown; Figure 3 It shows Figure 2 A-axis structure; Figure 4 It shows Figure 2 The structure of the fan-shaped nozzle during inward spraying in the 1-1 direction; Figure 5 It shows Figure 2 The structure of the fan-shaped nozzle during 2-2 direction vertical spraying; Figure 6 Show and see Figure 2 The structure of the fan-shaped nozzle during 3-3 outward spraying; Figure 7 The flowchart of a turbid circulating water purification method according to an embodiment of the present invention is shown.

[0039] like Figures 1 to 7 As shown in the figure, the pressurized turbid water purification device provided by the present invention includes a shell 1, a sludge collection device 2, a cyclone coagulation device, a sludge return guide cone 4, and a packing sedimentation separation layer 5, arranged sequentially from bottom to top within the internal space of the shell 1; wherein,

[0040] The swirl coagulation device includes an inlet guide tube 31 and a guide ring plate 32 disposed at the bottom port of the inlet guide tube 31; an inlet pipe 33 is connected in the tangential direction of the inlet guide tube 31; the guide ring plate 32 is disposed above the sludge inlet of the sludge collection device 2.

[0041] The sludge return guide cone 4 is set with its cone tip facing upwards, and the bottom end of the sludge return guide cone 4 is set at the top of the inlet guide cylinder 31.

[0042] An outlet chamber 6 is formed above the packing sedimentation separation layer 5; an outlet pipe 61 is provided in the outlet chamber 6.

[0043] The interior of the outer shell 1 is a pressurized, sealed space, and its shape is preferably, but not limited to, cylindrical.

[0044] The sludge collection device 2 is preferably, but not limited to, located at the bottom inside the housing 1, and the water outlet chamber 6 is located at the top inside the housing 1.

[0045] The water inlet guide tube 31 is preferably, but not limited to, cylindrical. A gap is left between the outer side wall of the water inlet guide tube 31 and the inner side wall of the outer shell 1 to form a cavity.

[0046] The bottom end of the sludge return guide cone 4 is fixed to the top end of the inlet guide cylinder 31, ensuring that the intercepted sludge can be guided back into the cavity between the inlet guide cylinder 31 and the outer shell 1 by the sludge return guide cone 4.

[0047] The water outlet end of the water outlet pipe 61 passes through the top of the outer shell 1. The gap between the water outlet pipe 61 and the outer shell 1 is sealed by a sealing structure or the water outlet pipe 61 and the top of the outer shell 1 are set as an integral structure to ensure that the inside of the outer shell 1 is a pressurized and sealed space. The water inlet pipe 33, as well as the subsequent automatic mud discharge pipe 21 and flushing water inlet pipe 83, all adopt the same design to ensure that the inside of the outer shell 1 is a pressurized and sealed space.

[0048] By sequentially arranging a sludge collection device 2, a vortex coagulation device, a sludge return guide cone 4, and a packing sedimentation separation layer 5 from bottom to top within the internal space of the outer shell 1, the sludge returned after coagulation and purification filtration is guided back into the cavity between the inlet guide cylinder 31 and the inner wall of the outer shell 1 by its own gravity. The sludge in the cavity comes into contact with the rising water flow, forming a large-scale sludge return. During the contact between the falling sludge and the rising water flow, the high-density sludge collides and aggregates with the tiny flocs in the rising water flow, forming larger flocs. Under the capture of the falling sludge and large flocs, some flocs grow fully, their descent speed exceeding the rising water flow velocity, and fall into the sludge collection device 2. Another part approaches the rising water flow velocity, forming a suspended sludge fluidized bed within the cavity, which coagulates the tiny flocs in the rising water flow and gradually forms large flocs that settle downwards under the promoting effect of the falling sludge and large flocs. The remaining flocs that do not grow fully... Continuing upwards, the flow velocity rapidly decreases after passing through the cavity between the inlet guide tube 31 and the outer shell 1. Part of the sludge falls above the sludge return guide cone 4, forming a sludge layer, while the other part enters the packing sedimentation separation layer 5, where it is intercepted and forms large sludge particles that fall back above the sludge return guide cone 4, forming another sludge layer. This sludge layer then flows back into the cavity between the inlet guide tube 31 and the outer shell 1. The sludge return process does not require the use of a venturi tube to draw sludge into the inlet water, eliminating the local resistance loss caused by the venturi tube in existing technologies. This reduces energy consumption in the water treatment process and avoids impacting equipment lifespan. Utilizing the tangential design of the inlet guide tube 31 and the inlet pipe 33, the dynamic pressure of the inlet water is converted into the power of the sewage vortex, solving the problems of insufficient reaction and low utilization rate of statically mixed chemicals in existing technologies. This invention achieves full-proportion sludge return, allowing the chemicals in the returned sludge to be fully utilized by suspended solids and grease in the rising water flow, reducing the dosage of coagulants and flocculants, among other technical benefits.

[0049] As a preferred embodiment of the present invention, it further includes an automatic sludge discharge control mechanism; wherein, the automatic sludge discharge control mechanism includes an automatic sludge discharge valve 71 disposed at the sludge discharge port of the sludge collection device 2, a sludge level gauge 72 disposed on the sludge collection device 2, and a main control mechanism connected to the automatic sludge discharge valve 71 and the sludge level gauge 72.

[0050] Specifically, the main control mechanism includes at least a processor with analytical processing capabilities, preferably a microcontroller. The main control mechanism is preferably, but not limited to, connected to the automatic sludge discharge valve 71 and the sludge level gauge 72 via signals. The control principle of the main control mechanism for automatic sludge discharge is preferably, but not limited to, when the sludge level gauge 72 detects that the sludge level in the sludge collection device 2 has reached a preset sludge level threshold, it sends a sludge level threshold height signal to the main control mechanism. The main control mechanism compares the received sludge level threshold height signal with a preset quantity setting value in a preset program. When the received sludge level threshold height signal reaches the preset quantity setting value, it controls the automatic sludge discharge valve 71 to open for a preset sludge discharge time and then close. The preset sludge level threshold, preset quantity setting value, and preset sludge discharge time can be set according to actual needs, and this invention does not impose any particular limitations on them. The automatic sludge discharge valve 71 is preferably, but not limited to, an electrically controlled valve for easy signal control.

[0051] In a preferred embodiment of the present invention, an automatic sludge discharge pipe 21 is connected to the sludge discharge port of the sludge collection device 2; the discharge outlet of the automatic sludge discharge pipe 21 passes through the side wall of the outer casing 1 and is located outside the outer casing 1; an automatic sludge discharge valve 61 is provided on the automatic sludge discharge pipe 21. The above-described structural design of the automatic sludge discharge pipe 21 facilitates the discharge of sludge from the sludge collection device 2.

[0052] As a preferred embodiment of the present invention, it further includes a sludge flushing device; wherein, the sludge flushing device includes a sludge flushing ring pipe 81 disposed above the sludge inlet of the sludge collection device 2 and a nozzle 82 disposed at the bottom of the sludge flushing ring pipe 81; the sludge flushing ring pipe 81 is disposed around the lower outer periphery of the guide ring plate 32; a flushing water inlet pipe 83 is connected to the water inlet of the sludge flushing ring pipe 81; the water inlet end of the flushing water inlet pipe 83 passes through the side wall of the housing 1 and is disposed outside the housing 1; an automatic flushing valve 831 is disposed on the flushing water inlet pipe 83; the automatic flushing valve 831 is signal connected to the main control mechanism.

[0053] Specifically, the number of nozzles 82 is preferably at least two, evenly distributed at the bottom of the mud flushing annular pipe 81. The nozzles 82 are preferably, but not limited to, fan-shaped nozzles, such as... Figures 4 to 6As shown, when a fan-shaped nozzle is selected, the spray range of the fan-shaped nozzle can be adjusted according to different rinsing requirements. This results in a better rinsing effect on the inner wall of the sludge collection device 2. By connecting the automatic flushing valve 831 to the main control mechanism, when the sludge level threshold height signal received by the main control mechanism reaches the preset quantity setting value, and after controlling the automatic sludge discharge valve 71 to open and reach the preset sludge discharge time, if the sludge level threshold height signal sent by the sludge level gauge 72 is still received, it may be due to the high oil content of the turbid circulating water sludge. After the sludge stays in the sludge collection device 2 for a long time, it gradually adheres to the inner wall of the sludge collection device 2. The sludge adhering to the inner wall of the sludge collection device 2 causes compaction, thus accumulating and not being completely discharged. At this time, the main control mechanism controls the automatic flushing valve 831 to open automatically, and the inner wall of the sludge collection device 2 is rinsed through the sludge flushing ring pipe 81 and the nozzle 82.

[0054] As a preferred embodiment of the present invention, the sludge collection device 2 is a sludge hopper with an inverted conical structure; the top opening of the sludge hopper is fitted to the inner wall of the outer shell 1.

[0055] It should be noted that the present invention preferably, but is not limited to, uses an inverted conical sludge hopper as the sludge collection device 2. The top opening of the sludge hopper is fitted to the inner wall of the outer shell 1 to ensure that the sludge falls into the sludge hopper. Only one sludge hopper is set up in the turbid circulating water treatment process, which reduces the risk of sludge discharge blockage.

[0056] As a preferred embodiment of the present invention, the outer shell 1 is a pressure-bearing and sealed space structure formed by the shell 11 and the end cap 12 disposed at the top of the shell 11; the water outlet pipe 61 is disposed at the top of the end cap 12; and an automatic water outlet valve 611 is provided on the water outlet pipe 61.

[0057] The housing 11 and the end cap 12 are detachably connected, and a pressure-bearing sealed space structure can be formed inside by adding a sealing ring or other sealing structure at the connection.

[0058] As a preferred embodiment of the present invention, the outer side wall of the water inlet guide tube 31 is fixed to the inner side wall of the outer shell 1 by a fixing connector 311; the lower end of the guide ring plate 32 is inclined inward.

[0059] It should be noted that the inward tilt angle of the lower end of the flow guide ring plate 32 can be obtained according to actual needs or experimental verification, and the present invention does not impose any special limitation on this.

[0060] As a preferred embodiment of the present invention, the water inlet end of the water inlet pipe 33 passes through the side wall of the outer casing 1 and is disposed outside the outer casing 1; an automatic water inlet valve 331 is provided on the water inlet pipe 33.

[0061] The automatic inlet valve 331 is preferably, but not limited to, an electrically controlled valve. The turbid circulating water to be treated, which enters through the inlet pipe 33, can be pre-added with chemicals. The chemicals are fully mixed and form flocs by swirling within the inlet guide tube 31.

[0062] As a preferred embodiment of the present invention, the packing sedimentation separation layer 5 includes a packing support 51 and an inclined tube packing 52 or an inclined plate packing disposed on the top of the packing support 51; the outer peripheral end of the packing support 51 is disposed in contact with the inner side wall of the outer shell 1; and or, the bottom end of the sludge return guide cone 4 is flush with the top end of the inlet guide cylinder 31.

[0063] The inclined tube packing 52 separates and settles the turbid circulating water, achieving mud-water separation. The purified turbid circulating water enters the outlet chamber 6. The sludge intercepted by the inclined tube packing 52 falls from the inclined tube and returns to the cavity between the inlet guide tube 31 and the shell 11 under the guidance of the sludge return guide cone 4. The packing support 51 is preferably, but not limited to, welded and fixed inside the shell 11 to support the inclined tube packing 52.

[0064] The turbid circulating water purification method provided by this invention uses the pressurized turbid circulating water purification device described above to purify the turbid circulating water, and includes the following steps:

[0065] Step S1: The turbid circulating water to be treated enters the inlet guide tube 31 through the inlet pipe 33 along the tangential direction of the inlet guide tube 31, causing the water flow in the inlet guide tube 31 to form a swirling flow.

[0066] Step S2: Under the action of swirling flow, some coarse solid particles in the turbid circulating water to be treated are separated by centrifugation and fall from the bottom of the inlet guide tube 31 into the sludge collection device 2; the turbid circulating water to be treated that has turned over the guide ring plate 32 in the inlet guide tube 31 flows upward along the cavity between the inlet guide tube 31 and the inner side wall of the outer shell 1 and enters the packing sedimentation separation layer 5.

[0067] Step S3: The sludge in the turbid circulating water to be treated entering the packing sedimentation separation layer 5 is intercepted by the packing sedimentation separation layer 5 to achieve sludge-water separation, and falls from the packing of the packing sedimentation separation layer 5. It is guided back to the cavity between the inlet guide tube 31 and the inner wall of the outer shell 1 through the sludge return guide cone 4. During the descent of the sludge in the cavity, it collides with the flocs in the rising water flow, capturing the pollutants in the water flow. The resulting large sludge pieces and large flocs settle downward and fall into the sludge collection device 2. The purified water obtained after passing through the packing sedimentation separation layer 5 enters the outlet chamber 6 and is discharged through the outlet pipe 61.

[0068] Specifically, after coagulants and flocculants are added to the turbid circulating water to be treated, it enters the inlet guide tube 31 tangentially from the inlet pipe 33 and flows downward along the tube wall to fill the inlet guide tube 31, causing the water inside the inlet guide tube 31 to form a swirling flow. Under the stirring action of the swirling flow, the suspended solids and oil in the water come into full contact with the coagulants and flocculants in the turbid circulating water to be treated and form flocs. Some coarse particles and larger flocs are centrifuged and separated in the inlet guide tube 31 and fall into the sludge hopper. As the water continues to flow upward, the smaller flocs in the water are intercepted and settled by the inclined tube packing 52 and fall from the inclined tube. The falling sludge, guided by the sludge return guide cone 4, returns to the cavity between the inlet guide tube 31 and the outer shell 1. The falling sludge collides with the flocs in the rising water flow, capturing pollutants in the water. Large sludge pieces and large flocs settle downwards into the sludge hopper at the bottom. The portion of the flocs with a settling velocity lower than the rising velocity of the water flow in the cavity between the inlet guide tube 31 and the outer shell 1 continues to flow upwards and is intercepted by the inclined tube packing 52. The flocs with a settling velocity equal to the rising velocity of the water flow in the cavity between the inlet guide tube 31 and the outer shell 1 form a suspended sludge fluidized bed here, promoting coagulation and capturing the rising flocs. During the turbidity circulating water treatment process, all the generated sludge eventually falls into the sludge hopper. When the sludge in the hopper accumulates to a preset high level, the sludge level gauge 72 sends a high-level signal. If two or more high-level signals are sent (preferably, but not limited to this), the processor of the main control mechanism determines that the sludge in the hopper has reached a high level and controls the automatic sludge discharge valve 71 to automatically open for 3 minutes (preferably, but not limited to this), and then automatically close. After the automatic sludge discharge valve 71 closes, if the high-level signal of the sludge level gauge does not disappear and continues to send a high-level sludge signal for 1 hour (preferably, but not limited to this), the automatic inlet valve 331 and the automatic outlet valve 611 can be closed. After the automatic sludge discharge valve 71 is opened to empty the device, the automatic flushing valve 831 is opened to automatically flush the sludge hopper. After the automatic flushing is completed, the automatic flushing valve 831 and the automatic sludge discharge valve 71 are closed, and the automatic inlet valve 331 and the automatic outlet valve 611 are opened to restore the device to normal operation.

[0069] As can be seen from the above specific embodiments, the pressurized turbid water purification device and purification method provided by the present invention, by sequentially arranging a sludge collection device, a vortex coagulation device, a sludge return guide cone, and a packing sedimentation separation layer from bottom to top in the internal space of the outer shell, utilizes the structural design of the sludge return guide cone to guide the sludge produced after coagulation and sludge-water separation purification back into the cavity between the inlet guide cylinder and the inner wall of the outer shell by its own gravity. The sludge in the cavity comes into contact with the rising water flow in the cavity, forming a large proportion of sludge return. During the process of the falling sludge and the rising water flow coming into contact, the high-density sludge collides and aggregates with the tiny flocs in the rising water flow, forming larger flocs. Under the capture of the falling sludge and large flocs, some flocs grow fully, and their falling speed can overcome the rising water flow speed, falling into the sludge collection device. The other part is close to the rising water flow speed, forming a suspended sludge fluidized bed in the cavity, which coagulates the tiny flocs in the rising water flow, and gradually forms large flocs under the coagulation promoting effect of the falling sludge and large flocs. The granular flocs settle downwards; the remaining flocs that have not grown sufficiently continue to flow upwards. After passing through the cavity between the inlet guide tube and the outer shell, the flow velocity rapidly decreases. Some of them fall above the sludge return guide cone to form a sludge layer, while the other part enters the packing sedimentation separation layer and is intercepted, forming large sludge particles within the packing. These sludge particles then fall above the sludge return guide cone to form a sludge layer, which then flows back to the cavity between the inlet guide tube and the outer shell. The sludge return process does not require the use of a venturi tube to draw sludge into the inlet water, eliminating the local resistance loss caused by the venturi tube in existing technologies. This reduces energy consumption in the water treatment process and avoids impacting equipment lifespan. By utilizing the tangential design of the inlet guide tube and inlet pipe, the dynamic pressure of the inlet water is converted into the power of the sewage vortex, solving the problems of insufficient reaction and low utilization rate of statically mixed agents in existing technologies. This invention can achieve full-proportion sludge return, and the agents in the returned sludge can be fully utilized by suspended solids and grease in the rising water flow, reducing the dosage of coagulants and flocculants, among other technical effects.

[0070] The pressurized circulating water purification device and method according to the present invention have been described above by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various modifications can be made to the pressurized circulating water purification device and method proposed in the present invention without departing from the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the contents of the appended claims.

Claims

1. A pressure type turbid water purification device, characterized by comprising: The pressure-bearing type turbid circulating water purification device comprises a shell, a sludge collecting device, a cyclone coagulation device, a sludge backflow guide cone and a filler sedimentation separation layer which are sequentially arranged in the internal space of the shell from bottom to top. The cyclone coagulation device comprises a water inlet guide cylinder and a guide ring plate arranged at the bottom port of the water inlet guide cylinder; a water inlet pipe is connected to the tangent direction of the water inlet guide cylinder; the guide ring plate is arranged above the sludge inlet of the sludge collecting device, and a cavity is formed between the water inlet guide cylinder and the inner side wall of the shell. The top of the sludge backflow guide cone is arranged upward, and the bottom end of the sludge backflow guide cone is arranged at the top end of the water inlet guide cylinder. A water outlet chamber is formed above the filler sedimentation separation layer; a water outlet pipe is arranged in the water outlet chamber. The shell is a pressure-bearing sealed space structure formed by a shell body and a head arranged at the top end of the shell body. The sludge collecting device is a mud bucket with an inverted conical body structure, and the top opening of the mud bucket is arranged in close contact with the inner wall of the shell. The outer side wall of the water inlet guide cylinder is fixed to the inner side wall of the shell by a fixed connecting piece, and the lower end of the guide ring plate is arranged inwardly inclined. The bottom end of the sludge backflow guide cone is flush with the top end of the water inlet guide cylinder.

2. The pressurized turbidity water purification device according to claim 1, wherein Further comprising an automatic sludge discharge control mechanism; wherein The automatic sludge discharge control mechanism comprises an automatic sludge discharge valve arranged at the sludge discharge port of the sludge collecting device, a sludge level meter arranged on the sludge collecting device, and a main control mechanism connected with the automatic sludge discharge valve and the sludge level meter.

3. The pressure-bearing type turbid circulating water purification device according to claim 2, wherein An automatic sludge discharge pipe is connected to the sludge discharge port of the sludge collecting device; The discharge port of the automatic sludge discharge pipe is arranged outside the shell through the side wall of the shell; The automatic sludge discharge valve is arranged on the automatic sludge discharge pipe.

4. The pressurized turbocyclone water purification unit of claim 2, wherein Further comprising a sludge flushing device; wherein The sludge flushing device comprises a sludge flushing ring pipe arranged above the sludge inlet of the sludge collecting device and a nozzle arranged at the bottom of the sludge flushing ring pipe; The sludge flushing ring pipe is arranged around the lower outer periphery of the guide ring plate; A flushing water inlet pipe is connected to the water inlet port of the sludge flushing ring pipe; The water inlet end of the flushing water inlet pipe is arranged outside the shell through the side wall of the shell; An automatic flushing valve is arranged on the flushing water inlet pipe; The automatic flushing valve is signal connected with the main control mechanism.

5. The pressure-bearing type turbid circulating water purification device according to claim 1, wherein The water outlet pipe is arranged at the top of the head; An automatic water outlet valve is arranged on the water outlet pipe.

6. The pressure-bearing type turbid circulating water purification device according to claim 1, wherein The water inlet end of the water inlet pipe is arranged outside the shell through the side wall of the shell; An automatic water inlet valve is arranged on the water inlet pipe.

7. The pressure-bearing type turbid circulating water purification device according to claim 1, wherein The filler sedimentation separation layer comprises a filler support and inclined tube filler or inclined plate filler arranged at the top of the filler support; The outer peripheral end of the filler support is arranged in close contact with the inner side wall of the shell.

8. A method for purifying a turbid aqueous solution, characterized by, The pressure type turbid circulating water purification device according to any one of claims 1-7 is used to purify turbid circulating water, including the following steps: Step S1, the turbid circulating water to be treated enters the water inlet guide cylinder along the tangent direction of the water inlet guide cylinder through the water inlet pipe, and drives the water flow in the water inlet guide cylinder to form a cyclone; Step S2, under the action of the cyclone, part of the coarse particle solids in the turbid circulating water to be treated are centrifuged and then fall into the sludge collecting device from the bottom of the water inlet guide cylinder; the turbid circulating water to be treated that turns over the guide ring plate from the water inlet guide cylinder flows upward along the cavity between the water inlet guide cylinder and the inner side wall of the shell into the filler sedimentation separation layer; Step S3, the sludge in the turbid circulating water to be treated that enters the filler sedimentation separation layer is intercepted by the filler sedimentation separation layer to achieve sludge-water separation, and falls from the filler of the filler sedimentation separation layer, is guided back into the cavity between the water inlet guide cylinder and the inner side wall of the shell through the sludge backflow guide cone, and the sludge in the cavity collides with the flocculation in the upward water flow during falling, captures the pollutants in the water flow, and large sludge and large particle flocculation are precipitated downward and fall into the sludge collecting device, and the purified water obtained after passing through the filler sedimentation separation layer enters the water outlet chamber and is discharged through the water outlet pipe.

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