Cyclone desanding system for sewage with low solid content

Abstract

The utility model belongs to the technical field of sewage treatment, and provides a low-solid-content sewage cyclone desanding system which comprises a pressure transmitter arranged on a water inlet pipe; the plurality of hydrocyclones are arranged behind the pressure transmitter in parallel; the plurality of first valves are respectively arranged on inlet pipelines of the hydrocyclones, and each first valve is associated with the pressure transmitter; the plurality of sand collecting chambers are respectively arranged at the first sand discharging openings in the lower parts of the hydrocyclones; the plurality of second valves are respectively arranged on the outlet pipeline of each sand collecting chamber; and the sand-water separator is connected with the outlet end of each second valve. The cyclone desanding system can automatically control the operation according to the water inlet pressure change to realize dynamic balance, is suitable for desanding treatment of sewage with large water inlet amount fluctuation and low solid content, and is efficient and stable in system operation and good in desanding effect.

Description

Technical Field

[0001] The utility model belongs to the field of sewage treatment equipment, and in particular relates to a cyclone sand removal system for low-solid-content sewage. Background Art

[0002] Sand removal during sewage pretreatment is an essential step in sewage treatment plants. Its effectiveness is directly related to the treatment effectiveness and operational maintenance workload of subsequent treatment units. Traditional sand removal systems primarily consist of horizontal flow grit chambers, aerated grit chambers, or cyclone grit chambers, all of which are primarily civil structures. All require pumping or air extraction, resulting in sand clogging and wear. Furthermore, all three have little effect on removing fine sand below 200μm. To address this, the applicant has previously developed a high-precision cyclone sand removal equipment system (such as the sewage sand removal system disclosed in patent CN215288245U), which can effectively remove fine sand below 200μm. However, during use, these systems were found to still suffer from issues such as clogging and unstable sand removal.

[0003] Furthermore, during sewage treatment plant operation, the main method for achieving liquid level control in the lift pump pool is to control the number or frequency of lift pumps in operation. However, the influent flow rate fluctuates significantly between the rainy and dry seasons, and between the flood season and the non-flood season, with the coefficient of variation of the treated water volume exceeding 1.5. Such large fluctuations in the influent flow rate can significantly impact the operation of the cyclone. Existing processes often utilize two cyclones, one in use and one in reserve. The influent to the cyclone is manually switched using a manual gate. These manual gates have a large diameter, are labor-intensive to operate, and have a switching lag. They cannot respond promptly to instantaneous water volume fluctuations, resulting in unstable operating conditions and internal flow fields in the cyclone, and even operating parameters outside the normal operating range, leading to unstable sand removal. Utility Model Content

[0004] In response to the defects of the above-mentioned existing technologies, the utility model provides a low-solid content sewage cyclone sand removal system that automatically controls operation according to changes in water inlet pressure to achieve dynamic balance. It is suitable for sand removal treatment of low-solid content sewage with large fluctuations in water inlet volume. The system operates efficiently and stably, and has good sand removal effect.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A low-solids-content sewage cyclone sand removal system, comprising:

[0007] Pressure transmitter, installed on the water pipe;

[0008] A plurality of cyclones are arranged in parallel after the pressure transmitter;

[0009] a plurality of first valves, respectively provided on the inlet pipeline of each of the cyclones, each of the first valves being associated with the pressure transmitter;

[0010] A plurality of sand collecting chambers are respectively provided at the first sand discharge port at the lower part of each cyclone;

[0011] A plurality of second valves are respectively provided on the outlet pipe of each of the sand collecting chambers;

[0012] A sand-water separator is connected to the outlet port of each second valve.

[0013] In one embodiment of the present application, all of the cyclones are associated with the pressure transmitter;

[0014] And / or, each of the cyclones is associated with the first valve on the corresponding inlet pipeline

[0015] In one embodiment of the present application, a pressure-equalizing flow distributor is further included, wherein the inlet end of the pressure-equalizing flow distributor is connected to the water pipe, and the outlet end of the pressure-equalizing flow distributor is respectively connected to the inlet pipelines of the plurality of cyclones.

[0016] In one embodiment of the present application, all the second valves are associated with each other, and each of the second valves is associated with the first valve on the same parallel branch.

[0017] In one embodiment of the present application, the first valve is a pneumatic gate valve;

[0018] And / or, the second valve is a pneumatic pipe clamp valve.

[0019] In one embodiment of the present application, the number of the cyclone, the first valve, the sand collecting chamber and the second valve is equal and corresponds one to one, and each includes 3 or more.

[0020] In one embodiment of the present application, a recoiler is further included, wherein an outlet end of the recoiler is connected to each of the sand collecting chambers via a pipeline, and a one-way air inlet valve is provided between each of the sand collecting chambers and the recoiler.

[0021] In one embodiment of the present application, the sand-water separator includes a sand settling hopper and a conveying mechanism; the sand settling hopper is provided with an overflow port, a drain port and an emptying port from top to bottom; the conveying mechanism is a spiral conveying mechanism, one end of which is connected to the bottom of the sand settling hopper and the other end is provided with a second sand discharge port.

[0022] In one embodiment of the present application, the cyclone and the sand collecting chamber are arranged above the sand hopper via a riser.

[0023] In one embodiment of the present application, a controller is further included, and the controller is electrically connected to the pressure transmitter, the cyclone, the first valve, the second valve, the sand-water separator, and the backwasher.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. The low-solids-content sewage cyclone sand removal system of the present invention is equipped with a pressure transmitter to detect the water inlet pressure. The pressure transmitter is associated with the first valve on the cyclone parallel branch. The opening and closing operation of the cyclone branch is automatically controlled according to changes in the water inlet pressure. This can effectively solve problems such as unstable flow pattern and poor sand removal caused by fluctuations in the water inlet volume. A sand collection chamber and a second valve are provided at the bottom of the cyclone to enable intermittent sand removal, which is suitable for sand removal treatment of low-solids-content sewage. It can effectively increase the discharged sand concentration and reduce the hydraulic load of the sand-water separator. The low-solids-content sewage cyclone sand removal system operates efficiently and stably, and has good sand removal effect.

[0026] 2. Both the first valve and the second valve are pneumatic valves, and the second valve is a pneumatic pipe clamp valve, which can achieve rapid opening and closing, and avoid seal failure caused by sand blockage and wear. It can achieve precise flow dynamic adjustment and precise underflow sand discharge control, which can effectively improve the stability and reliability of system operation.

[0027] 3. A backwasher is connected to the sand collecting chamber to backwash the sand collecting chamber, which can effectively solve the problem of fine sand compaction in the sand collecting chamber and blockage of the first sand discharge port at the bottom of the cyclone, ensuring smooth intermittent sand discharge and stable operation of the system.

[0028] 4. The cyclone and sand collecting chamber are installed above the sand hopper through a vertical pipe, so that the cyclone, sand collecting chamber and sand hopper are directly connected along the gravity direction, which improves the structural layout of the equipment, avoids the installation of horizontal pipe sections, and thus avoids the problem of sand accumulation and blockage in the horizontal pipe sections. At the same time, it can save more than 20% of the floor space. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 This is a flow chart of the low solid content sewage cyclone sand removal system for this application.

[0031] Figure 2 This is a front view schematic diagram of the installation structure of the low-solid content sewage cyclone sand removal system of this application.

[0032] Figure 3 This is a side view schematic diagram of the installation structure of the low-solid content sewage cyclone sand removal system of this application.

[0033] Reference numerals:

[0034] 1. Pressure transmitter;

[0035] 2. Pressure equalizing flow distributor;

[0036] 3. First valve;

[0037] 4. Cyclone; 41. First row of sand outlet;

[0038] 5. Sand collecting chamber; 51. Recoiler; 52. One-way air inlet valve;

[0039] 6. Second valve;

[0040] 7. Sand-water separator; 71. Sand settling hopper; 711. Overflow port; 712. Drain port; 713. Emptying port; 72. Conveying mechanism; 721. Second sand discharge port. DETAILED DESCRIPTION

[0041] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0042] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present invention are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0044] The terms "installed," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0046] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0047] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0048] like Figures 1 to 3 As shown, an embodiment of the present invention provides a low-solids-content sewage cyclone sand removal system, which includes a pressure transmitter 1, multiple cyclones 4, multiple first valves 3, multiple sand collection chambers 5, multiple second valves 6, and a sand-water separator 7. The multiple cyclones 4 are arranged in parallel to form multiple parallel branches, and each parallel branch is sequentially provided with a first valve 3, a cyclone 4, a sand collection chamber 5, and a second valve 6.

[0049] Specifically, the pressure transmitter 1 is provided on the water pipe and is used to detect the total water inlet pressure. The pressure can be converted into an electrical signal to determine the size of the water inlet flow.

[0050] A plurality of cyclones 4 are arranged in parallel after the pressure transmitter 1 , that is, a plurality of parallel branches are arranged after the pressure transmitter 1 , and a cyclone 4 is arranged on each parallel branch.

[0051] Multiple first valves 3 are installed on the inlet pipeline above each cyclone 4. That is, each cyclone 4 has a corresponding first valve 3 on its inlet pipeline. The opening and closing of these first valves 3 controls whether water enters the corresponding cyclone 4. Each first valve 3 is associated with a pressure transmitter 1 for coordinated control. Changes in the inlet water pressure (i.e., flow rate) detected by the pressure transmitter 1 control the opening or closing of each first valve 3, thereby controlling the number of cyclones 4 in operation. This allows for automated, rapid adjustment and balancing of the water flow entering the cyclones 4, preventing fluctuations in the inlet water flow from impacting the cyclones 4 and affecting the sand removal effect, thereby ensuring efficient and stable operation of the cyclone sand removal system.

[0052] In a further embodiment, all cyclones 4 are associated with the pressure transmitter 1 to achieve linkage, and the number of cyclones 4 in operation is controlled based on the changes in the inlet water pressure detected by the pressure transmitter 1. Furthermore, each cyclone 4 is associated with the first valve 3 on the corresponding branch line to achieve linkage. When the first valve 3 on its inlet pipe is opened, the cyclone 4 also starts operating, and when the first valve 3 on its inlet pipe is closed, the cyclone 4 also closes, achieving synchronous automatic control.

[0053] Multiple sand collecting chambers 5 are respectively provided at the first sand discharge port 41 at the bottom of each cyclone 4, that is, each cyclone 4 is provided with a sand collecting chamber 5 at the first sand discharge port 41 at the bottom of the cyclone 4. The sand collecting chamber 5 is used to collect and temporarily store solid particles precipitated by the cyclone 4.

[0054] A plurality of second valves 6 are respectively provided on the outlet pipe of each sand collecting chamber 5 , that is, each sand collecting chamber 5 is provided with a second valve 6 , and the discharge of sand and water in the sand collecting chamber 5 is controlled by switching the second valve 6 .

[0055] A sand-water separator 7 is connected to the outlet of each second valve 6 , that is, to the outlet of each sand collection chamber 5 . It is used to process the concentrated sand collected in the sand collection chamber 5 by sedimentation, drainage, and sand separation, thereby achieving complete separation of sand and water, thereby achieving sand removal from the wastewater. Preferably, one set of sand-water separators 7 is included to separately process the concentrated sand water discharged from each sand collection chamber 5 , saving equipment investment; of course, multiple sets of sand-water separators 7 can also be provided.

[0056] A sand collecting chamber 5 and a second valve 6 are provided at the bottom of the cyclone 4 to realize intermittent sand discharge, which is suitable for sand removal treatment of low-solid content sewage, can effectively increase the sand concentration and reduce the hydraulic load of the sand-water separator 7; the low-solid content sewage cyclone sand removal system operates efficiently and stably, and has a good sand removal effect.

[0057] In one embodiment, a pressure-equalizing flow distributor 2 is further included. The pressure-equalizing flow distributor 2 includes an inlet end and multiple outlet ends. The inlet end is connected to the water pipe, that is, connected after the pressure transmitter 1; the outlet end is respectively connected to the inlet pipelines of multiple cyclones 4. The first valve 3 is installed on the inlet pipeline, that is, the outlet end of the pressure-equalizing flow distributor 2 is connected to the front end of the parallel branch. The pressure-equalizing flow distributor 2 is configured to evenly distribute flow to multiple parallel branches running simultaneously, so that the cyclones 4 operate in a stable flow state.

[0058] In one embodiment, all second valves 6 are associated with each other, and each second valve 6 is associated with a first valve 3 on the same parallel branch.

[0059] For example, when there is a set of sand-water separators 7, and the sand-water separator 7 only processes a fixed number (such as one or two) of concentrated sand deposited in the sand collecting chambers 5 at a time, then only less than or equal to the fixed number of second valves 6 can be opened at a time to discharge the concentrated sand into the sand-water separator 7; all the second valves 6 are associated to realize associated control, which can effectively avoid the problem of more second valves 6 being opened at the same time, causing the sand-water separator 7 to operate overloaded.

[0060] Second valve 6 is linked to first valve 3 and can be controlled to open automatically based on the accumulated opening time of first valve 3. Specifically, when first valve 3 is open and cyclone 4 is operating, the opening time of first valve 3 is calculated. When the accumulated opening time reaches the set value, second valve 6 is automatically opened to discharge concentrated sand intermittently. This automated control prevents premature or late opening of second valve 6, which could affect the sand removal efficiency of cyclone 4 and the cyclic operation of sand-water separator 7.

[0061] Preferably, the first valve 3 and the second valve 6 are both pneumatic valves.

[0062] Further preferably, the first valve 3 is a pneumatic gate valve, and the second valve 6 is a pneumatic pipe clamp valve.

[0063] The use of pneumatic valves allows for automatic and rapid valve closing, achieving both automated and rapid control with low cost and high practicality. The second valve 6 at the bottom of the sand collection chamber 5 uses a pneumatic pinch valve instead of a conventional electric valve. The pneumatic actuator allows for sand discharge opening and closing in less than 5 seconds. The pinch valve's structure also effectively prevents seal failure caused by sand jamming and wear.

[0064] Preferably, the number of cyclones 4, first valves 3, sand collecting chambers 5, and second valves 6 is equal and corresponds to each other, forming a parallel branch. The number of cyclones 4, first valves 3, sand collecting chambers 5, and second valves 6 is three or more, that is, three or more parallel branches.

[0065] The three parallel branches allow for precise adjustment based on fluctuations in inlet flow, adapting to water volume fluctuations. Specifically, during normal operating water flow, two cyclones 4 operate. When the inlet pressure falls below the lower limit of normal operating pressure, one cyclone 4 automatically shuts down, leaving one operational. When the inlet pressure rises above the upper limit of normal operating pressure, all three cyclones 4 automatically start operating simultaneously. When all three cyclones 4 are operating, an alarm sounds if the pressure exceeds the upper limit.

[0066] In one embodiment, a recoiler 51 is further included, and the outlet end of the recoiler 51 is connected to each sand collecting chamber 5 via a pipeline, and a one-way air inlet valve 52 is provided between each sand collecting chamber 5 and the recoiler 51. The recoiler 51 can be one or more, that is, each sand collecting chamber 5 can be provided with a corresponding recoiler 51, or a recoiler 51 can be provided to correspond to multiple sand collecting chambers 5 at the same time. The recoiler 51 can be provided to aerate the sand collecting chamber 5, effectively solving the problems such as the blockage of the sand collecting chamber 5 and the first sand discharge port 41 caused by the dense accumulation time, the operating pressure and the gravity, and the like of the internal sand settling, the compaction and the "arching". A one-way air inlet valve 52 is provided to control the aeration to avoid leakage.

[0067] Preferably, the sand-water separator 7 includes a sand hopper 71 and a conveying mechanism 72. The sand hopper 71 is provided with an overflow port 711, a drain port 712, and an emptying port 713, sequentially arranged from top to bottom. The overflow port 711 is aligned with or higher than the concentrated sand discharge port. The drain port 712 is located in the middle of the sand hopper 71 and is used to discharge the upper layer of clear water after the concentrated sand has settled. The emptying port 713 is located at the bottom of the sand hopper 71 for emptying the sand. Each of the overflow port 711, drain port 712, and emptying port 713 is equipped with an on / off valve. The conveying mechanism 72 is preferably a screw conveying mechanism, one end of which is connected to the bottom of the sand hopper 71 and the other end extends outside the sand hopper 71. A second sand discharge port 721 is provided at the other end. Solid sand particles deposited at the bottom of the sand hopper 71 are conveyed and discharged by the conveying mechanism 72, achieving the separation of concentrated sand from water. The sand-water separator 7 has a simple structure and facilitates sand-water separation.

[0068] It is further preferred that the cyclone 4 and the sand collecting chamber 5 are vertically or obliquely arranged above the sand settling hopper 71 through a riser, so that the concentrated sand in the cyclone 4 and the sand collecting chamber 5 can flow into the sand settling hopper 71 of the sand-water separator 7 below by gravity; the arrangement of horizontal pipe sections is avoided, thereby avoiding the blockage problem of horizontal pipe sections, and at the same time can effectively save floor space, which can save 20% or more of floor space.

[0069] The cyclone sand removal system also includes a controller (not shown in the figure), which is preferably a PLC controller, which is connected to the pressure transmitter 1, the cyclone 4, the first valve 3, the second valve 6, the sand-water separator 7 and the backwasher 51 to realize automatic intelligent control of the system.

Claims

1. A low solid content sewage cyclone sand removal system, characterized in that: include: A pressure transmitter (1) is provided on the water pipe; A plurality of cyclones (4) are arranged in parallel after the pressure transmitter (1); A plurality of first valves (3), respectively provided on the inlet pipeline of each cyclone (4), each first valve (3) being associated with the pressure transmitter (1); A plurality of sand collecting chambers (5) are respectively provided at the first sand discharge port (41) at the lower portion of each cyclone (4); A plurality of second valves (6), respectively provided on the outlet pipeline of each of the sand collecting chambers (5); A sand-water separator (7) is connected to the outlet end of each of the second valves (6).

2. The low-solids sewage cyclone sand removal system according to claim 1 is characterized by: All of the cyclones (4) are associated with the pressure transmitter (1); And / or, each of the cyclones (4) is associated with the first valve (3) on the corresponding inlet pipeline.

3. The low solid content sewage cyclone sand removal system according to claim 1, characterized in that: It also includes a pressure-equalizing flow distributor (2), the inlet end of the pressure-equalizing flow distributor (2) being connected to the incoming water pipe, and the outlet end being connected to the inlet pipelines of the plurality of cyclones (4).

4. The low solid content sewage cyclone sand removal system according to claim 1, characterized in that: All the second valves (6) are associated with each other, and each of the second valves (6) is associated with the first valve (3) on the same parallel branch.

5. The low-solids-content sewage cyclone sand removal system according to claim 1 or 4, characterized in that: The first valve (3) is a pneumatic gate valve; And / or, the second valve (6) is a pneumatic pipe clamp valve.

6. The low solid content sewage cyclone sand removal system according to claim 1, characterized in that: The cyclone (4), the first valve (3), the sand collecting chamber (5) and the second valve (6) are equal in number and correspond one to one, and each includes three or more.

7. The low solid content sewage cyclone sand removal system according to claim 1, characterized in that: It also includes a recoiler (51), the outlet end of the recoiler (51) is connected to each of the sand collecting chambers (5) via a pipeline, and a one-way air inlet valve (52) is provided between each of the sand collecting chambers (5) and the recoiler (51).

8. The low solid content sewage cyclone sand removal system according to claim 1, characterized in that: The sand-water separator (7) comprises a sand hopper (71) and a conveying mechanism (72); the sand hopper (71) is provided with an overflow port (711), a drain port (712) and an emptying port (713) from top to bottom; the conveying mechanism (72) is a spiral conveying mechanism, one end of which is connected to the bottom of the sand hopper (71) and the other end of which is provided with a second sand discharge port (721).

9. The low solid content sewage cyclone sand removal system according to claim 8, characterized in that: The cyclone (4) and the sand collecting chamber (5) are arranged above the sand settling hopper (71) via a riser.

10. The low solid content sewage cyclone sand removal system according to claim 7, characterized in that: It also includes a controller, which is electrically connected to the pressure transmitter (1), the cyclone (4), the first valve (3), the second valve (6), the sand-water separator (7) and the backwasher (51).

Images