Circulating water system with multi-stage filtration function

Abstract

This utility model belongs to the field of circulating water treatment technology, specifically relating to a circulating water system with multi-stage filtration. The circulating water system with multi-stage filtration includes a circulating water tank and a side-filter unit. The circulating water tank is sequentially connected to a heat exchanger and a cooling tower. The side-filter unit includes a side-filter pump and a main side-filter. The circulating water tank is connected to the side-filter pump via a main circulating water pipe, and the side-filter pump is connected to the main side-filter via an inlet header pipe. A pipeline filter is installed on the inlet header pipe. The bottom of the main side-filter is connected to the main circulating water pipe via an outlet pipe, and an outlet filter is installed on the outlet pipe. This utility model's circulating water system with multi-stage filtration overcomes the problems of flocculent substances clogging components and leakage caused by quartz sand impact damage to the device in existing technologies by installing filters and dosing pipelines at different locations, thus ensuring stable system operation.

Description

Technical Field

[0001] This utility model belongs to the field of circulating water treatment technology, specifically relating to a circulating water system with multi-stage filtration function. Background Technology

[0002] In industrial production, circulating water systems are widely used to effectively dissipate heat from equipment and ensure stable production operation. However, during long-term use, especially for circulating cooling water in cooling towers, dust and other suspended solids from the air can mix into the circulating water during heat dissipation. At the same time, scale, rust, and microbial slime generated inside the system can also detach and disperse, causing the turbidity of the circulating water to increase and the content of bacteria, algae, and other pollutants to exceed the allowable values. Side-stream filtration systems are a key means to effectively maintain the quality of circulating water.

[0003] A common side-stream filtration method involves drawing a portion of the circulating water from the main circulation pipeline, filtering impurities through multiple cycles, and then discharging the impurities from the system via backwashing. CN215609856U discloses a cooling water circulating water treatment system in which a side-stream filtration device is connected to the cooling water system or circulating water system via an input pipeline. The side-stream filtration device is connected to a sewage tank and a suction well via a backwash pipeline and an output pipeline, respectively. A side-stream filtration pump, a flow rate regulating device, and a flow monitor are installed sequentially on the input pipeline. The flow monitor is connected to a controller, and the controller controls the flow rate regulating device. This system can filter cooling water and reduce turbidity during system operation, and can prevent blockage of the input pipeline through flow monitoring and flow rate regulation. The system directly filters cooling water during operation, reducing turbidity and minimizing heat exchanger deposits and blockages, thus ensuring production. The side-stream filter is easy to maintain, requiring only annual replacement of the quartz sand. However, it does not consider the presence of flocculent matter and other substances in the environment that easily adhere to the surface of the quartz sand, which can easily enter the system and clog components, increasing cleaning difficulty and posing safety hazards in confined spaces. Furthermore, with prolonged use, the quartz sand can collide under the impact of circulating water, easily damaging the side-stream filter and leading to quartz sand leakage, which can affect the normal operation of downstream equipment. Utility Model Content

[0004] To overcome the problems in existing technologies where flocculent materials easily enter the system and clog components, and where quartz sand easily damages the device due to impact, leading to leakage and affecting the operation of downstream devices, this utility model provides a circulating water system with multi-stage filtration function.

[0005] The circulating water system with multi-stage filtration function described in this utility model includes a circulating water tank, a side-filter unit, a heat exchanger, and a cooling tower. The circulating water tank, heat exchanger, and cooling tower are connected in sequence, and the cooling tower is equipped with a pipeline for returning to the circulating water tank. The side-filter unit includes a side-filter pump and a side-filter main filter. The circulating water tank is connected to the side-filter pump through the circulating water main pipe, and the side-filter pump is connected to the side-filter main filter through the inlet water header. A pipeline filter is installed on the inlet water header. The bottom of the side-filter main filter is connected to the circulating water main pipe through an outlet water pipeline, and an outlet filter is installed on the outlet water pipeline.

[0006] Preferably, the main filter is further provided with a dosing pipeline connected to a sodium hypochlorite storage tank, and the top of the main filter is connected to a backwash drain header for discharging wastewater generated during the backwashing process to the wastewater treatment system.

[0007] Preferably, the main filter is equipped with an automatic vent valve and a pressure gauge at the top to monitor the pressure inside the main filter and ensure the stability of the system operation.

[0008] Preferably, the pipeline filter consists of two filters connected in parallel. Each filter comprises a shell and an inner cylindrical filter element. The cylindrical filter element has three layers: an outer metal filter screen for filtering large particulate impurities, a middle polyester fiber felt for filtering flocculent substances in the circulating water, and an inner metal filter screen to support the polyester fiber felt and ensure that the inner cylindrical filter element maintains its shape after long-term use. Furthermore, a pressure gauge is installed at the pipeline filter to monitor its operating status. Each filter is equipped with a control valve to ensure that one is open and the other is on standby, preventing filter element blockage after prolonged operation.

[0009] Preferably, the outlet filter is equipped with multiple layers of filter cotton to filter out crushed or washed-out quartz sand due to equipment damage, and a sight glass is provided on the wall of the outlet filter to observe whether there is any abnormal leakage during the operation of the system.

[0010] Preferably, the main side filter is designed from top to bottom as a water distributor, a quartz sand filling layer, and a water collector. Furthermore, the quartz sand particle size in the quartz sand filling layer increases sequentially from top to bottom. The upper layer of fine quartz sand is used to intercept small suspended particles, the middle layer of medium quartz sand is used to intercept medium particles, and the lower layer of coarse quartz sand serves as a support layer to prevent the loss of fine sand and to evenly distribute the water flow. The water collector consists of a perforated plate and a filter cap. The filter cap can be detachably installed in the holes of the perforated plate, which can collect the filtered water and prevent the quartz sand from leaking out.

[0011] Preferably, the bypass pump is connected to the bottom of the main bypass filter via a backwash water inlet pipe. A control valve is installed on the backwash water inlet pipe, which is used to transport circulating water to the main bypass filter for backwashing.

[0012] Specifically, when the above system is in use, the circulating water in the circulating water tank is pumped to the heat exchanger for heat exchange. After heat exchange, it is cooled by the cooling tower and then returned to the circulating water tank. In order to prevent the heat exchange effect from being reduced due to the decline in water quality during circulation, and to prevent problems such as scaling inside the heat exchanger, the circulating water circulation process and circulating water filtration are carried out simultaneously. The circulating water filtration relies on the side filter unit. The specific side filter process is as follows: the water in the circulating water tank enters the side filter pump through the circulating water main pipe, and then is transported through the inlet water header. It undergoes preliminary filtration through the pipeline filter. The pressure gauge at the pipeline filter monitors its operating status. The pipeline filter consists of two parallel filters. When the pressure is abnormal due to filter blockage, the control valve in front of the filter automatically opens or closes to ensure that one filter is always operating normally.

[0013] The filtered water enters the main side filter. The circulating water is evenly sprayed onto the quartz sand filling layer by the water distributor. After filtration, it enters the water collector. The automatic air vent valve and pressure gauge on the top of the main side filter monitor the internal pressure to ensure stable operation. The water after deep filtration is transported through the outlet pipeline, passes through the outlet filter along the way, and finally flows back to the main circulating water pipe to complete the circulating water cleaning. The outlet filter is equipped with multiple layers of filter cotton. The sight glass on the wall can be used to observe whether there is any abnormal leakage.

[0014] In addition, backwashing can be performed periodically according to the pressure during the operation of the main filter. Before backwashing, sodium hypochlorite from the sodium hypochlorite storage tank is sent into the main filter via the dosing pipeline to dissolve the flocs accumulated on the surface of the quartz sand. After dissolution, backwashing is performed. The system backwashes the main filter through the backwash water inlet pipeline. The wastewater generated by backwashing is discharged to the wastewater treatment system through the backwash drain header connected at the top. The pressure gauge at the top of the main filter plays a monitoring and assurance role during operation.

[0015] Finally, to ensure the cleaning effect of the circulating water and the stability of the system operation, multiple parallel side-filters are installed on the main circulating water pipe. Multiple side-filters can filter the circulating water at the same time, but two side-filters cannot be backwashed at the same time. They must be backwashed sequentially to ensure that the circulating water filtration and backwashing are carried out simultaneously.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The circulating water system with multi-stage filtration function described in this utility model effectively prevents flocculent matter from entering the side-filter system by setting a filter before the main side-filter; a sodium hypochlorite dosing pipeline is set on the main side-filter to treat the flocculent matter in the system, thereby increasing the filter throughput and reducing the frequency of maintenance.

[0018] This invention adds an outlet filter with a viewing window after the main side filter, allowing for the observation of abnormal leaks in the side filter during routine inspections. This effectively prevents a large amount of quartz sand from entering downstream devices due to damage to the filter cap, ensuring the stable operation of the system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the circulating water system with multi-stage filtration function according to this utility model;

[0020] Figure 2 This is a schematic diagram of the side-filter unit in this utility model;

[0021] Figure 3 This is a schematic diagram of the main filter structure in this utility model;

[0022] Figure 4 This is a schematic diagram of the outlet filter structure in this utility model.

[0023] In the diagram: 1. Circulating water tank; 2. Main circulating water pipe; 3. Side filter pump; 4. Main side filter; 401. Water distributor; 402. Quartz sand filling layer; 403. Water collector; 4031. Perforated plate; 4032. Filter cap; 5. Inlet header; 6. Pipeline filter; 7. Outlet pipeline; 8. Outlet filter; 801. Filter cotton; 802. Sight glass; 9. Sodium hypochlorite storage tank; 10. Backwash drain header; 11. Wastewater treatment system; 12. Automatic air vent valve; 13. Filter; 1301. Outer shell; 1302. Tube filter element; 14. Pressure gauge; 15. Control valve; 16. Heat exchanger; 17. Cooling tower; 18. Chemical dosing pipeline; 19. Backwash water inlet pipeline. Detailed Implementation

[0024] The specific technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0025] like Figures 1-4 As shown, the circulating water system with multi-stage filtration function includes a circulating water tank 1, a side-filter unit, a heat exchanger 16, and a cooling tower 17. The circulating water tank 1 is connected to the heat exchanger 16, and the heat exchanger 16 is connected to the cooling tower 17. The cooling tower 17 is provided with a pipeline for returning water to the circulating water tank 1. The circulating water tank 1 is provided with a main circulating water pipe 2 connected to the side-filter unit. The side-filter unit includes a side-filter pump 3 and a main side-filter 4. The main circulating water pipe 2 is connected to the side-filter pump 3, and the side-filter pump 3 is connected to the main side-filter 4 through an inlet header pipe 5. A pipeline filter 6 is provided on the inlet header pipe 5. The bottom of the main side-filter 4 is connected to the circulating water tank 1 through an outlet pipe 7, and an outlet filter 8 is provided on the outlet pipe 7.

[0026] The main filter 4 is also equipped with a dosing pipeline 18 connected to the sodium hypochlorite storage tank 9. The top of the main filter 4 is connected to the sewage treatment system 11 through the backwash drain header 10. The top of the main filter 4 is equipped with an automatic air vent valve 12 and a pressure gauge 14.

[0027] The pipeline filter 6 consists of two parallel filters 13. Each filter 13 consists of a housing 1301 and an internal cylindrical filter element 1302. A pressure gauge 14 is installed at the pipeline filter 6, and a control valve 15 is installed before each filter 13.

[0028] The outlet filter 8 is equipped with multiple layers of filter cotton 801 inside, and a sight glass 802 is provided on the wall of the outlet filter 8.

[0029] The main filter 4 is designed from top to bottom as follows: water distributor 401, quartz sand filling layer 402, and water collector 403. The water collector 403 is composed of a perforated plate 4031 and a filter cap 4032.

[0030] The bypass pump 3 is connected to the bottom of the bypass main filter 4 through the backwash water inlet pipe 19, and a control valve 15 is installed on the backwash water inlet pipe 19.

[0031] The circulating water system with multi-stage filtration function described herein is used in which circulating water in the circulating water tank 1 is pumped to the heat exchanger 16 for heat exchange, and after heat exchange, it is cooled by the cooling tower 17 and returned to the circulating water tank 1. The side filter unit operates at the same time. The operation process is as follows: the water in the circulating water tank 1 enters the side filter pump 3 through the circulating water main pipe 2, and then is transported through the inlet water header 5. It undergoes preliminary filtration through the pipeline filter 6. The pressure gauge 14 at the pipeline filter 6 monitors its operating status. The pipeline filter 6 consists of two parallel filters 13. When the pressure is abnormal due to the blockage of the filter 13, the control valve 15 before the filter 13 automatically opens or closes to ensure that one filter 13 is always operating normally.

[0032] The filtered water enters the main side filter 4. Under the action of the water distributor 401, the circulating water is evenly sprayed onto the quartz sand filling layer 402. After filtration, it enters the water collector 403. The automatic air vent 12 and pressure gauge 14 on the top of the main side filter 4 monitor the internal pressure to ensure stable operation. The water after deep filtration is transported through the outlet pipe 7, passes through the outlet filter 8 along the way, and finally flows back to the main circulating water pipe 2 to complete the cleaning of the circulating water. The outlet filter 8 is equipped with multiple layers of filter cotton 801 for filtration. The wall sight glass 802 can be used to observe whether there is any abnormal leakage.

[0033] In addition, backwashing can be performed periodically according to the pressure during the operation of the main filter 4. Before backwashing, sodium hypochlorite in the sodium hypochlorite storage tank 9 is sent to the main filter 4 via the dosing line 18 to dissolve the flocs accumulated on the surface of the quartz sand. After dissolution, backwashing is performed. The system backwashes the main filter 4 through the backwash water inlet line 19. The wastewater generated by backwashing is discharged to the wastewater treatment system 11 through the backwash drain header 10 connected at the top. The pressure gauge 14 at the top of the main filter 4 plays a monitoring and assurance role during operation.

[0034] Finally, to ensure the cleaning effect of the circulating water and the stability of the system operation, multiple parallel side-filter main filters 4 are installed on the circulating water main pipe 2. Multiple side-filter main filters 4 can filter the circulating water at the same time, but two side-filter main filters 4 cannot be backwashed at the same time. They must be backwashed in sequence to ensure that the circulating water filtration and backwashing are carried out simultaneously.

Claims

1. A circulating water system with multi-stage filtration function, comprising a circulating water tank (1), a side-stream filter unit, a heat exchanger (16), and a cooling tower (17), characterized in that, The circulating water tank (1) is connected to the heat exchanger (16), the heat exchanger (16) is connected to the cooling tower (17), and the cooling tower (17) is provided with a pipeline for returning to the circulating water tank (1); the circulating water tank (1) is provided with a circulating water main pipe (2) connected to the side filter unit, the side filter unit includes a side filter pump (3) and a side filter main filter (4), the circulating water main pipe (2) is connected to the side filter pump (3), the side filter pump (3) is connected to the side filter main filter (4) through the inlet water header (5), and a pipeline filter (6) is provided on the inlet water header (5); the bottom of the side filter main filter (4) is connected to the circulating water tank (1) through the outlet water pipeline (7), and an outlet filter (8) is provided on the outlet water pipeline (7).

2. The circulating water system with multi-stage filtration function according to claim 1, characterized in that, The main filter (4) is also equipped with a dosing pipeline (18) connected to the sodium hypochlorite storage tank (9), and the top of the main filter (4) is connected to the sewage treatment system (11) through the backwash drain header (10).

3. The circulating water system with multi-stage filtration function according to claim 1, characterized in that, The main filter (4) is equipped with an automatic exhaust valve (12) and a pressure gauge (14) on top.

4. The circulating water system with multi-stage filtration function according to claim 1, characterized in that, The pipeline filter (6) consists of two parallel filters (13). Each filter (13) consists of a shell (1301) and an internal cylindrical filter element (1302). A pressure gauge (14) is installed at the pipeline filter (6), and a control valve (15) is installed in front of each filter (13).

5. The circulating water system with multi-stage filtration function according to claim 1, characterized in that, The outlet filter (8) is provided with multiple layers of filter cotton (801) inside, and a sight glass (802) is provided on the wall of the outlet filter (8).

6. The circulating water system with multi-stage filtration function according to claim 1, characterized in that, The main filter (4) is designed from top to bottom as follows: water distributor (401), quartz sand filling layer (402), and water collector (403). The water collector (403) is composed of a perforated plate (4031) and a filter cap (4032).

7. The circulating water system with multi-stage filtration function according to claim 1, characterized in that, The bypass pump (3) is connected to the bottom of the bypass main filter (4) through the backwash water inlet pipe (19), and a control valve (15) is provided on the backwash water inlet pipe (19).

Images