Auxiliary machine circulating cooling water bypass filtration system

Abstract

The utility model relates to industrial circulating cooling water treatment technical field especially is involved in a kind of auxiliary machine circulating cooling water side flow filtration system, and the system includes circulating water main pipe, side flow water taking branch pipe, backwater pipe, water taking control valve, booster pump, filtration assembly, backwash unit and control unit;Side flow water taking branch pipe takes water from circulating water main pipe, is sent to filtration assembly by booster pump, is sent back circulating water main pipe after filtration by backwater pipe;Backwash unit can be by compressed air backwashing filter element, blowdown valve synchronous discharge impurity;Control unit is automatically controlled filtration and backwash process according to differential pressure, pressure, flow signal.This system only side flow water taking filtration, does not affect main circulating pressure;Three-stage composite filter element filtration precision is high;Automatic backwashing reduces manual maintenance;Detachable filter element prolongs the life of consumables, applicable to pump, heat exchanger and other industrial auxiliary machine circulating cooling water purification, guarantee auxiliary machine stable operation.

Description

Technical Field

[0001] This utility model relates to the field of industrial circulating cooling water treatment technology, and in particular to an auxiliary machine circulating cooling water bypass filtration system. Background Technology

[0002] In industrial production, the normal operation of auxiliary equipment (such as cooling water pumps, heat exchangers, and air compressors) depends on the cooling and lubrication effects of circulating cooling water. However, during long-term circulation, circulating cooling water is prone to contamination with impurities such as silt, rust, microbial slime, and pipeline corrosion products. These impurities deposit on the flow channels, heat exchange surfaces, or seals of the auxiliary equipment, leading to reduced flow rate, decreased heat exchange efficiency, and even blockage of the flow channels. Hard impurities can exacerbate the wear of internal components (such as impellers and bearings), shortening the maintenance cycle and service life of the auxiliary equipment. Furthermore, impurities provide a carrier for microbial growth, intensifying corrosion of pipelines and auxiliary equipment, and further deteriorating the operating condition of the circulating water system.

[0003] Existing filtration solutions for auxiliary machine circulating cooling water mostly employ "full-flow filtration" or "simple side-flow filtration." Full-flow filtration requires all circulating water to be introduced into the filter, resulting in high filtration resistance and potentially causing excessive pressure loss in the circulating water system, affecting the auxiliary machine's water supply pressure. Simple side-flow filtration (such as using only a screen filter) has low filtration accuracy, cannot effectively remove fine impurities, and the screen is prone to clogging, requiring frequent manual cleaning, leading to high maintenance costs and low automation, making it unsuitable for continuous industrial production. Therefore, there is an urgent need for a side-flow filtration system for auxiliary machine circulating cooling water that offers high filtration efficiency, high automation, does not affect the pressure of the main circulation system, and can achieve self-cleaning, to address the shortcomings of existing technologies. Utility Model Content

[0004] The purpose of this invention is to provide an auxiliary machine circulating cooling water bypass filtration system that can solve the above-mentioned technical problems.

[0005] This utility model provides an auxiliary machine circulating cooling water bypass filtration system, including a main circulating water pipe, a bypass water intake branch pipe, a return water pipe, and a filter assembly. The two ends of the main circulating water pipe are respectively connected to the inlet and outlet of the auxiliary machine, forming the main circulating loop of the auxiliary machine cooling water. One end of the bypass water intake branch pipe is connected to the outlet section of the main circulating water pipe, and the other end is connected in series with a water intake control valve and a booster pump before being connected to the inlet of the filter assembly. The filter assembly includes a filter housing, a filter element installed in the filter housing, and differential pressure sensors respectively installed at the inlet and outlet of the filter assembly. One end of the return water pipe is connected to the outlet of the filter assembly, and the other end is connected to the inlet section of the circulating water main. It also includes a backwashing unit and a control unit. The backwashing unit includes a backwashing pipeline, a backwashing control valve, a flushing source, and a check valve. One end of the backwashing pipeline is connected to the flushing source, and the other end penetrates the filter housing and extends to the inside of the filter element. The backwashing control valve and the check valve are connected in series on the backwashing pipeline. The signal input terminal of the control unit is electrically connected to the differential pressure sensor, and the signal output terminal is electrically connected to the water intake control valve, the booster pump, and the backwashing control valve, respectively.

[0006] Furthermore, the filter element has a multi-layer composite structure, consisting of a quartz sand layer, an activated carbon layer, and a precision filter membrane layer in sequence; the quartz sand particle size of the quartz sand layer is 0.5-1mm, the activated carbon particle size of the activated carbon layer is 1-2mm, and the filter membrane pore size of the precision filter membrane layer is 5-10μm.

[0007] Furthermore, the flushing source is a compressed air source with a working pressure of 0.6-0.8 MPa; the one-way valve is used to prevent circulating water from flowing back into the flushing source.

[0008] Furthermore, the booster pump is a variable frequency horizontal centrifugal pump, and a pressure sensor is installed at the outlet end of the booster pump; the pressure sensor is electrically connected to the signal input terminal of the control unit, and the control unit can adjust the speed of the booster pump according to the detection signal of the pressure sensor.

[0009] Furthermore, a flow sensor is installed on the bypass water intake branch pipe; the flow sensor is electrically connected to the signal input terminal of the control unit, and the control unit can adjust the opening degree of the water intake control valve according to the detection signal of the flow sensor.

[0010] Furthermore, a check valve is connected in series on the return water pipe; the flow direction of the check valve is consistent with the water flow direction in the return water pipe, which is used to prevent water in the main circulating water pipe from flowing back into the return water pipe.

[0011] Furthermore, the bottom of the filter housing is provided with a drain port, and a drain control valve is connected in series on the drain port; the drain control valve is electrically connected to the signal output terminal of the control unit, and the control unit can control the drain control valve and the backwash control valve to start and stop synchronously.

[0012] Furthermore, the control unit includes a PLC controller and a human-machine interface; the human-machine interface is a touch screen, which can display the bypass flow rate, booster pump outlet pressure, filter element pressure difference and system operating status in real time, and supports manual / automatic mode switching.

[0013] Furthermore, the filter element and the filter housing are detachably connected; the top of the filter housing is provided with an openable end cap, and the filter element can be removed for replacement or cleaning after the end cap is opened.

[0014] Furthermore, a temperature sensor is installed in the inlet section of the main circulating water pipe; the temperature sensor is electrically connected to the signal input terminal of the control unit, and the control unit can adjust the water intake ratio of the bypass water intake branch pipe (the bypass ratio is 5%-15%) according to the detection signal of the temperature sensor.

[0015] Beneficial effects: This invention utilizes a bypass water intake system, filtering only a portion of the circulating water to avoid pressure loss in the main system caused by full-flow filtration, thus ensuring stable water supply pressure for auxiliary equipment. The filter components effectively remove impurities such as silt, rust, and microbial slime, significantly reducing the risk of internal wear and clogging in the auxiliary equipment. The control unit automatically stops water intake and initiates backwashing based on differential pressure sensor signals, ensuring the filtration effect of the filter components. The entire backwashing process requires no manual intervention, solving the problem of frequent manual disassembly and cleaning of filter screens required in existing simple bypass filters, greatly reducing maintenance costs and labor intensity. Furthermore, the filter element can be reused after backwashing, reducing the frequency of filter element replacement and further lowering consumable costs. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a block diagram showing the connection between some components and the control unit in this utility model.

[0018] Explanation of reference numerals in the attached diagram: 1-Auxiliary machine, 2-Main circulating water pipe, 3-Bypass water intake branch pipe, 4-Return water pipe, 5-Filter assembly, 501-Filter housing, 502-Filter element, 6-Water intake control valve, 7-Boost pump, 8-Differential pressure sensor, 9-Backwash pipeline, 10-Backwash control valve, 11-Check valve, 12-Check valve, 13-Drain outlet, 14-Drain control valve, 15-Control unit, 16-Pressure sensor, 17-Flow sensor, 18-Temperature sensor. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example 1 This utility model provides an auxiliary machine circulating cooling water bypass filtration system, such as Figure 1-2As shown, its core structure includes: a main circulating water pipe 2, a bypass water intake branch pipe 3, a return water pipe 4, a water intake control valve 6, a booster pump 7, a filter assembly 5, a backwashing unit, and a control unit 15; the connection relationships and structural details of each component are as follows: Main circulating water pipe 2: This is the main flow pipe for circulating cooling water of auxiliary machine 1. One end is connected to the water inlet of auxiliary machine 1, and the other end is connected to the water outlet of auxiliary machine 1, forming the main circulating loop of cooling water for auxiliary machine. The bypass water intake branch pipe 3 is connected at one end to the outlet section (downstream of the auxiliary machine) of the circulating water main pipe 2, and at the other end to the inlet of the filter assembly 5 after the water intake control valve 6 and the booster pump 7 are connected in series. The booster pump 7 is used to provide stable power for the bypass filtration and avoid unstable filtration flow due to pressure fluctuations in the main pipeline. Filter assembly 5 includes a stainless steel filter housing 501, a detachable filter element 502, and a differential pressure sensor 8. The filter housing has an inlet and an outlet, and a drain outlet 13 at the bottom. The filter element 502 is installed inside the filter housing 501 and adopts a multi-layer composite structure (quartz sand layer, activated carbon layer, and precision filter membrane layer in sequence) to achieve three-stage filtration: coarse filtration, adsorption, and fine filtration. The two detection ends of the differential pressure sensor 8 are installed at the inlet and outlet of the filter assembly 5, respectively, to detect the pressure difference on both sides of the filter element in real time. Return water pipe 4: One end is connected to the outlet of filter component 5, and the other end is connected to the inlet section (upstream of auxiliary machine) of circulating water main pipe 2, so as to send the filtered clean water back to the main circulation system. Backwashing unit: includes backwashing pipeline 9, backwashing control valve 10, flushing source and check valve 11; one end of backwashing pipeline 9 is connected to the flushing source (which can be a compressed air source or a high-pressure clean water source), and the other end penetrates the top of filter housing 501 and extends to the inside of filter element 502; backwashing control valve 10 is connected in series with backwashing pipeline 9 to control the start and stop of backwashing; check valve 11 is installed between backwashing pipeline 9 and flushing source to prevent circulating water from flowing back into the flushing source; Control Unit 15: A PLC controller (such as Siemens S7-200 series) is used. Its signal input terminals are electrically connected to the differential pressure sensor 8, the booster pump outlet pressure sensor 16, the bypass water intake branch pipe flow sensor 17, and the temperature sensor 18, respectively. Its signal output terminals are electrically connected to the water intake control valve 6, the booster pump 7, the backwash control valve 10, and the drain control valve 14 of the filter assembly drain port, respectively. It is used to automatically control the operation of each component according to the detection signals.

[0023] Working and usage process: Normal filtration process: Control unit 15 opens water intake control valve 6 and booster pump 7, and part of the circulating water in the main circulating water pipe 2 (downstream outlet of auxiliary machine) enters the system through the bypass water intake branch pipe 3; The booster pump 7 pressurizes the circulating water to 0.3-0.4 MPa and sends it to the inlet of the filter assembly 5; The circulating water passes sequentially through the quartz sand layer of filter element 502 (removing large particles with a particle size ≥100μm), the activated carbon layer (adsorbing organic matter and odors), and the precision filter membrane layer (removing fine impurities with a particle size ≥5μm). The filtered clean water flows into the return water pipe 4 through the outlet of the filter assembly, and then is sent back to the inlet section (upstream of the auxiliary machine) of the circulating water main pipe 2 through the check valve 12 to participate in the main circulation. Pressure sensor 16 and flow sensor 17 transmit data to control unit 15 in real time. If the pressure is below 0.3 MPa or the flow rate is below 18 m³ / s, the control unit will detect the data. 3 / h, the control unit 15 automatically increases the speed of the booster pump 7 to ensure stable filtration parameters.

[0024] 2. Backwashing process: When the filter element accumulates more impurities, the pressure difference between the inlet and outlet of the filter assembly increases; when the differential pressure sensor detects a pressure difference ≥ 0.2 MPa, it sends a signal to the control unit. The control unit closes the water intake control valve 6 and the booster pump 7, while simultaneously opening the sewage discharge control valve 14 and the backwash control valve 10; Compressed air (0.6-0.8MPa) from the flushing source enters the inside of the filter element of the filter assembly 5 through the backwashing pipeline 9, and backwashes the filter element to blow off the attached impurities to the bottom of the filter housing. Impurities are discharged from the system along with a small amount of accumulated water through the drain control valve 14; after backwashing for 30-60 seconds, the control unit closes the backwash control valve 10 and the drain control valve 14, and reopens the water intake control valve 6 and the booster pump 7 to restore normal filtration. If the pressure difference is still ≥0.15MPa after backwashing, the control unit will issue a "filter replacement reminder" via the touch screen, prompting manual replacement of the filter.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An auxiliary machine circulating cooling water bypass filtration system, characterized in that, The system includes a main circulating water pipe, a bypass water intake branch pipe, a return water pipe, and a filter assembly. The main circulating water pipe connects to the inlet and outlet of the auxiliary machine at both ends, forming the main circulating cooling water loop for the auxiliary machine. One end of the bypass water intake branch pipe is connected to the outlet section of the main circulating water pipe, and the other end is connected in series with a water intake control valve and a booster pump before being connected to the inlet of the filter assembly. The filter assembly includes a filter housing, a filter element installed inside the filter housing, and differential pressure sensors installed at the inlet and outlet of the filter assembly. One end of the return water pipe is connected to… The filter assembly has its outlet connected to the inlet section of the main circulating water pipe at the other end; it also includes a backwashing unit and a control unit. The backwashing unit includes a backwashing pipeline, a backwashing control valve, a flushing source, and a check valve. One end of the backwashing pipeline is connected to the flushing source, and the other end penetrates the filter housing and extends to the inside of the filter element. The backwashing control valve and the check valve are connected in series on the backwashing pipeline. The signal input terminal of the control unit is electrically connected to the differential pressure sensor, and the signal output terminal is electrically connected to the water intake control valve, the booster pump, and the backwashing control valve, respectively.

2. The auxiliary machine circulating cooling water bypass filtration system according to claim 1, characterized in that, The filter element has a multi-layer composite structure, consisting of a quartz sand layer, an activated carbon layer, and a precision filter membrane layer. The quartz sand in the quartz sand layer has a particle size of 0.5-1 mm, the activated carbon in the activated carbon layer has a particle size of 1-2 mm, and the filter membrane in the precision filter membrane layer has a pore size of 5-10 μm.

3. The auxiliary machine circulating cooling water bypass filtration system according to claim 1, characterized in that, The flushing source is a compressed air source with a working pressure of 0.6-0.8 MPa.

4. The auxiliary machine circulating cooling water bypass filtration system according to claim 1, characterized in that, The booster pump is a variable frequency horizontal centrifugal pump, and a pressure sensor is installed at the outlet end of the booster pump; the pressure sensor is electrically connected to the signal input end of the control unit.

5. The auxiliary machine circulating cooling water bypass filtration system according to claim 1, characterized in that, A flow sensor is installed on the bypass water intake branch pipe; the flow sensor is electrically connected to the signal input terminal of the control unit.

6. The auxiliary machine circulating cooling water bypass filtration system according to claim 1, characterized in that, A check valve is connected in series on the return water pipe; the flow direction of the check valve is the same as the water flow direction in the return water pipe.

7. The auxiliary machine circulating cooling water bypass filtration system according to claim 1, characterized in that, The bottom of the filter housing is provided with a drain port, and a drain control valve is connected in series with the drain port; the drain control valve is electrically connected to the signal output terminal of the control unit.

8. The auxiliary machine circulating cooling water bypass filtration system according to claim 1, characterized in that, The control unit includes a PLC controller and a human-machine interface; the human-machine interface is a touch screen.

9. The auxiliary machine circulating cooling water bypass filtration system according to claim 1, characterized in that, The filter element and the filter housing are detachably connected; the top of the filter housing is provided with an openable end cap.

10. The auxiliary machine circulating cooling water bypass filtration system according to claim 1, characterized in that, A temperature sensor is installed in the inlet section of the circulating water main; the temperature sensor is electrically connected to the signal input terminal of the control unit.

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