A treatment system for reducing turbidity of utility 5 degree celsius water

Abstract

This utility model discloses a treatment system for reducing the turbidity of water at 5°C in public works projects. The system includes a bypass pipeline equipped with a first regulating valve, a main water supply pipeline connected to the bypass pipeline and extending from the inlet side of the first regulating valve to the outlet side of the first regulating valve, a second regulating valve connected sequentially along the water flow direction to the main water supply pipeline, a tubular electric field coagulant that uses a low-voltage electric field to promote the coagulation of colloids in the water, a third regulating valve, a filter, and a fourth regulating valve, and a flushing system for backwashing the tubular electric field coagulant and the filter. The tubular electric field coagulant has a drain pipe connected to the filter drain pipe, and a first manual valve is installed on the drain pipe of the tubular electric field coagulant. This system, through the added equipment and improved flushing pipeline, can improve the filtration effect and effectively reduce the turbidity of water at 5°C.

Description

Technical Field

[0001] This utility model relates to water filtration treatment, specifically to a treatment system for reducing the turbidity of water in public works by 5°C. Background Technology

[0002] In chlor-alkali chemical production processes, due to process requirements, a large number of heat exchange devices are needed to cool the main and auxiliary materials to achieve heat exchange and meet process requirements. Commonly used water cooling media include 5°C water, -35°C brine, and circulating water. Through these cooling media, the heat exchange of materials in the heat exchange equipment is transferred, thereby obtaining a material medium that meets the process control requirements.

[0003] In the utilities of chlor-alkali chemical production systems, 5°C water is the most common cooling medium, characterized by its wide distribution and high usage. If the key control indicator (turbidity) of the 5°C water system exceeds the standard, the following adverse effects will occur: 1. Scale easily forms on the pipe walls transporting the water, clogging the heat exchanger tubes, reducing the heat exchange area, failing to achieve the required performance, and affecting equipment uptime; 2. Increased turbidity accelerates microbial growth, significantly increasing the amount of water quality control agents needed, leading to higher production costs; 3. Increased metal ions in the water enhance electrochemical reactions, further corroding equipment pipes and causing hidden damage; 4. Frequent equipment maintenance affects continuous system operation, reduces equipment uptime, and increases labor intensity and production costs.

[0004] At a water temperature of 5℃, the negatively charged colloidal particles and tiny suspended impurities that affect turbidity cannot be effectively coagulated or agglomerated, and therefore cannot be effectively intercepted by the filter, making it impossible to control the turbidity within a more reasonable range. Utility Model Content

[0005] The purpose of this invention is to provide a treatment system for reducing the turbidity of water in public works at 5°C, thereby solving the technical problem that existing systems cannot effectively reduce turbidity.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A treatment system for reducing the turbidity of water in public works by 5°C includes a bypass pipeline equipped with a first regulating valve, a main water supply pipeline connected to the bypass pipeline and extending from the inlet side of the first regulating valve to the outlet side of the first regulating valve, a second regulating valve connected sequentially along the water flow direction to the main water supply pipeline, a tubular electric field coagulant that promotes the coagulation of colloids in the water using a low-voltage electric field, a third regulating valve, a filter, and a fourth regulating valve, and a flushing system for backwashing the tubular electric field coagulant and the filter; the tubular electric field coagulant is equipped with a drain pipe connected to the drain pipe of the filter, and a first manual valve is provided on the drain pipe of the tubular electric field coagulant.

[0007] Furthermore, the tubular electric field condenser includes a rectangular cylinder, connecting covers at both ends of the rectangular cylinder, plate electrodes inside the rectangular cylinder, and a power supply connected to the plate electrodes; the plate electrodes are provided with an even number of positive and negative plates, which are arranged alternately along the width of the rectangular cylinder; the end of the connecting cover is provided with a flange to form an inlet and outlet; the connecting cover on the drain side of the tubular electric field condenser is provided with a flushing inlet pipe, and the connecting cover on the inlet side is provided with a sewage outlet pipe.

[0008] Furthermore, the flushing system includes a water source, a variable frequency water pump, a fifth regulating valve, a first electric three-way valve, and a second electric three-way valve connected in sequence via pipelines; one port of the first electric three-way valve is connected to the backwash inlet of the filter via a pipeline, one port of the second electric three-way valve is connected to the flushing inlet pipe of the tubular electric field condenser, and the other port is connected to the main water supply pipeline between the third regulating valve and the filter inlet via a pipeline.

[0009] Furthermore, a remote flow sensor is connected to the pipeline on the inlet side of the first electric three-way valve.

[0010] Furthermore, a second hand valve, a third hand valve, and a fourth hand valve are respectively connected to the two side pipes of the second, fourth, and fifth regulating valves.

[0011] Furthermore, an online turbidity monitoring and analysis instrument is connected to the bypass pipeline and is located at the end of the main water supply pipeline in the drainage direction.

[0012] Furthermore, remote differential pressure transmitters are installed on both the inlet and outlet sides of the filter's main water supply pipeline.

[0013] Compared with the prior art, the beneficial effects of this utility model are: The system incorporates a tubular electric field coagulant, which promotes the coagulation or agglomeration of negatively charged colloidal particles and tiny suspended impurities that are difficult to treat in water at low temperatures (5°C). This allows subsequent filters to effectively reduce turbidity. The included flushing system can backwash the tubular electric field coagulant and the filter, as well as perform forward flushing of the filter. This system allows for faster cleaning of the filter cartridges and also enhances the coagulation effect of the tubular electric field coagulant. Attached Figure Description

[0014] Figure 1 This is a system schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the tubular electric field condenser of this utility model.

[0015] Among them, 1-tubular electric field condenser; 2-filter; 3-first regulating valve; 4-bypass pipeline; 5-main water supply pipeline; 6-second regulating valve; 7-third regulating valve; 8-fourth regulating valve; 9-rectangular cylinder; 10-connecting cover; 11-plate electrode; 12-power supply; 13-water source; 14-variable frequency water pump; 15-fifth regulating valve; 16-first electric three-way valve; 17-second electric three-way valve; 18-remote differential pressure transmitter; 19-remote flow sensor; 20-online turbidity comprehensive monitoring and analysis instrument. Detailed Implementation

[0016] The preferred embodiments of this utility model will be described below with reference to the accompanying drawings.

[0017] like Figure 1 and 2 As shown, a treatment system for reducing the turbidity of 5°C water in public works is presented. This system primarily employs filtration to reduce turbidity, with the addition of a tubular electric field coagulant 1 working in conjunction with a filter 2. The tubular electric field coagulant 1 promotes the coagulation or aggregation of colloidal particles and tiny suspended impurities in the 5°C water, which can then be effectively intercepted by the filter 2, achieving more effective filtration. A backwashing system is also included to backwash both the tubular electric field coagulant 1 and the filter 2.

[0018] The system specifically includes a bypass pipe 4 connected to a first regulating valve 3, a main water supply pipe 5 connected to the bypass pipe 4 and extending from the inlet side of the first regulating valve 3 to the outlet side of the first regulating valve 3, a second regulating valve 6 connected sequentially along the water flow direction to the main water supply pipe 5, a tubular electric field coagulant 1 that uses a low-voltage electric field to promote the coagulation of colloids in the water, a third regulating valve 7, a filter 2, and a fourth regulating valve 8, as well as a flushing system for backflushing the tubular electric field coagulant 1 and the filter 2. One end of the bypass pipe 4 is connected to the refrigerant outlet to introduce 5°C water, and the other end is connected to a water storage tank. The first regulating valve 3 is an electric regulating valve, mainly used to control the on / off state and flow regulation of the bypass pipe 4. The main water supply pipe 5 is used to filter water after being connected to the filtration equipment. The second regulating valve 6 is an electric regulating valve used to control the on / off state and flow regulation of the main water supply pipe 5. The tubular electric field coagulant 1 needs to be used in conjunction with the filter 2, acting at the front end of the filter 2. The third regulating valve 7 is an electrically operated regulating valve, which controls the on / off state and flow rate of the drain end of the tubular electric field condenser 1. It also works in conjunction with the flushing system to achieve the flushing function. Filter 2 is the core equipment of this system. The filter element of filter 2 is a degreased cotton filter element, and its structure requires a backwashing mechanism. The fourth regulating valve 8 is an electrically operated regulating valve, used to control the on / off state and flow rate of the outlet pipe of filter 2. The flushing system is used to backwash the tubular electric field condenser 1 and filter 2 to improve the filtration effect and filter element life. In this system, the tubular electric field condenser 1 has a drain pipe connected to the drain pipe of filter 2, and a first manual valve is installed on the drain pipe of the tubular electric field condenser 1.

[0019] The tubular electric field condenser 1 in the system includes a rectangular cylinder 9, a connecting cover 10, plate electrodes 11, and a power supply 12. The rectangular cylinder 9 is shaped to accommodate the plate electrodes 11. The connecting cover 10 adopts a cylindrical structure with a round top and square bottom, which can fit the rectangular cylinder 9 and facilitates connection with flange components. The round top end of the connecting cover 10 is connected to the flange. The rectangular cylinder 9 and the connecting cover 10 can be made of PVC or iron material with an insulating varnish coating on the inner wall. There are an even number of plate electrodes 11, which are divided into an equal number of positive and negative plates. The positive and negative plates are arranged alternately along the width of the rectangular cylinder 9, and the length of the positive and negative plates is equal to the length of the rectangular cylinder 9. Both positive and negative electrode plates are rectangular thin sheets made of stainless steel or titanium. The edges of the positive and negative electrode plates can be embedded within the rectangular tube 9. Terminals are connected to the positive and negative electrode plates, and wires are led out to the outside of the rectangular tube 9. All positive electrode plates are connected in parallel, and all negative electrode plates are connected in parallel, finally connected to the corresponding positive and negative terminals of the power supply 12. The spacing between adjacent positive and negative electrode plates is controlled at 20~50mm. The power supply 12 can be a switching power supply 12 or a DC power supply 12 available in the factory. Specific requirements for the rectangular tube 9 dimensions, positive and negative electrode plate requirements, power supply 12 requirements, and application conditions are detailed in the design parameter table (Table 1). To avoid colloidal adhesion to the electrodes affecting the coagulation effect, the tubular electric field condenser 1 uses a backwashing method to clean the electrode plates. Therefore, a flushing inlet pipe is provided on the drain side of the tubular electric field condenser 1, and a drain pipe is provided on the inlet side of the connecting cover 10. Backwashing is completed using a flushing system.

[0020] Table 1: Design Parameter Table Processing flow rate (m³ / h) Electrode plates (number of positive and negative electrodes) Plate spacing (mm) Electrode plate dimensions (length × width × thickness, mm) Supply voltage (V) Current density (mA / cm²) Rated current (A) Nine rectangular tubes (width × height × length, mm) Water flow velocity (m / s) Dwell time (s) 1-3 1 positive, 1 negative (single group) 20-30 300×200×2 3-6 0.1-0.2 0.5-1.0 200×300×600 0.1-0.15 4-5 4-8 2 positive, 2 negative (alternating arrangement) 30-40 400×300×2 6-9 0.2-0.3 1.0-2.0 300×400×800 0.15-0.2 4-5 9-15 3 positive, 3 negative (alternating arrangement) 40-50 500×400×3 9-12 0.3-0.4 2.0-3.5 400×500×1000 0.2-0.25 4-5 .

[0021] The flushing system includes a water source 13, a variable frequency water pump 14, a fifth regulating valve 15, a first electric three-way valve 16, and a second electric three-way valve 17, all connected sequentially via pipelines. The water source 13 can be filtered water from a storage tank, providing convenient access and preventing secondary contamination of the filter 2 during flushing; other suitable water sources can also be used. The variable frequency water pump 14 is connected to a DCS system for control. The fifth regulating valve 15 is an electric regulating valve used for on / off control and flow regulation of its respective pipeline. The first electric three-way valve 16 and the second electric three-way valve 17 operate by switching water paths. One port of the first electric three-way valve 16 is connected to the backwash inlet of the filter 2 via a pipeline; one port of the second electric three-way valve 17 is connected to the flushing inlet pipe of the tubular electric field condenser 1, and the other port is connected to the main water supply pipeline 5 between the third regulating valve 7 and the filter 2 inlet via a pipeline. The selective opening of the first electric three-way valve 16 can enable backwash water intake for the filter 2 or directional water supply for the tubular electric field condenser 1; the second electric three-way valve 17 can specifically adjust the water supply to the tubular electric field condenser 1 or the forward flushing water supply to the filter 2.

[0022] A remote flow sensor 19 is connected to the pipeline on the inlet side of the first electric three-way valve 16. The remote flow sensor 19 is connected to the DCS system for control. The DCS system controls the opening of the fifth regulating valve 15 according to the feedback flow to ensure stable flow.

[0023] To facilitate the maintenance of the control valves and other equipment, a second hand valve, a third hand valve, and a fourth hand valve are respectively connected to the pipelines on both sides of the second control valve 6, the fourth control valve 8, and the fifth control valve 15.

[0024] An online turbidity comprehensive monitoring and analysis instrument 20 is connected to the bypass pipeline 4 and is located at the end of the main water supply pipeline 5 in the drainage direction. It is used to monitor the water quality of the filtered water in real time and feed the data back to the DCS system. The DCS system is used to control the opening and closing of the second regulating valve 6 and its degree of opening.

[0025] Both the inlet and outlet sides of the filter 2 are equipped with remote differential pressure transmitters 18, which are connected to the DCS system. The pressure difference between the two ends of the filter 2 determines the blockage of the filter 2, thereby controlling whether the backwash system is running.

[0026] All the control valves mentioned in this system are connected to the DCS system for control.

[0027] The working process and principle of this utility model are as follows: Under normal circumstances, the system keeps the first regulating valve 3 closed. It only opens the first regulating valve 3 when the storage tank requires emergency water supply, while simultaneously keeping the second, third, and fourth manual valves open. During filtration and turbidity reduction, the system first opens the second regulating valve 6, the third regulating valve 7, and the fourth regulating valve 8. Water flows through the main water supply pipeline 5, sequentially passing through the tubular electric field condenser 1 and the filter 2, and finally enters the storage tank through the bypass pipe. If the online turbidity monitoring and analysis instrument 20 detects that the water turbidity does not meet the requirements, the system closes the second regulating valve 6 or reduces the flow rate. Reducing the flow rate prolongs the time the water spends passing through the tubular electric field condenser 1 and the filter 2, improving the filtration effect. If the turbidity is significantly higher than the set range, the filter 2 may be damaged and requires timely maintenance and inspection; in this case, the second regulating valve 6 is closed. When water passes through the tubular electric field coagulant 1, it passes through the electric field formed between adjacent electrode plates, causing negatively charged colloidal particles and tiny suspended impurities to coagulate or agglomerate. The water flow carries the coagulated or agglomerated flocs into the filter 2, where they are trapped by the filter element; the filter element also traps other fine particles. At this point, the water is effectively filtered, and the turbidity is effectively reduced.

[0028] When the pressure difference across the remote differential pressure transmitter 18 exceeds the set range, or after the system has been running for a fixed period, the flushing system is activated. During flushing, the second regulating valve 6, the third regulating valve 7, and the fourth regulating valve 8 are closed. Then, the fifth regulating valve 15 is opened, and the first electric three-way valve 16 is adjusted to connect with the backwash port of filter 2. The manual valve on the drain pipe of filter 2 is then opened. The variable frequency water pump 14 is then started for backwashing, and the wastewater is discharged through the drain pipe. After the first electric three-way valve 16 changes the water path, the second electric three-way valve 17 connects the water path to the inlet of filter 2, enabling forward flushing of filter 2. Forward and backwashing alternate for a certain period, alternating at least once. After flushing filter 2 is complete, the second electric three-way valve 17 connects the water path to the flushing inlet pipe of the tubular electric field condenser 1, and the first manual valve is opened, allowing the backwash wastewater from the tubular electric field condenser 1 to be discharged through the drain pipe. The backwashing of the tubular electric field condenser 1 is time-controlled, or it can be performed simultaneously with the backwashing of the filter 2. After the backwashing operation is completed, the corresponding valves are closed, and the corresponding valves are opened to perform the filtration operation when filtration is required.

Claims

1. A treatment system for reducing the turbidity of water in public works at 5°C, characterized in that, The system includes a bypass pipeline equipped with a first regulating valve, a main water supply pipeline connected to the bypass pipeline and extending from the inlet side of the first regulating valve to the outlet side of the first regulating valve, a second regulating valve connected to the main water supply pipeline in the direction of water flow, a tubular electric field coagulant that uses a low-voltage electric field to promote the coagulation of colloids in the water, a third regulating valve, a filter, and a fourth regulating valve, as well as a flushing system for backwashing the tubular electric field coagulant and the filter; the tubular electric field coagulant is equipped with a drain pipe and connected to the drain pipe of the filter, and a first manual valve is provided on the drain pipe of the tubular electric field coagulant.

2. The processing system as described in claim 1, characterized in that, The tubular electric field condenser includes a rectangular cylinder, connecting covers at both ends of the rectangular cylinder, plate electrodes inside the rectangular cylinder, and a power supply connected to the plate electrodes. The plate electrodes have an even number of positive and negative plates, which are arranged alternately along the width of the rectangular cylinder. The connecting covers have flanges at their ends to form inlet and outlet ports. A flushing inlet pipe is provided on the connecting cover on the drain side of the tubular electric field condenser, and a sewage pipe is provided on the connecting cover on the inlet side.

3. The processing system as described in claim 2, characterized in that, The flushing system includes a water source, a variable frequency water pump, a fifth regulating valve, a first electric three-way valve, and a second electric three-way valve connected in sequence via pipelines; one port of the first electric three-way valve is connected to the backwash inlet of the filter via a pipeline, one port of the second electric three-way valve is connected to the flushing inlet pipe of the tubular electric field condenser, and the other port is connected to the main water supply pipeline between the third regulating valve and the filter inlet via a pipeline.

4. The processing system as described in claim 3, characterized in that, A remote flow sensor is connected to the pipeline on the inlet side of the first electric three-way valve.

5. The processing system as described in claim 3, characterized in that, The second, fourth, and fifth regulating valves are respectively connected to a second hand valve, a third hand valve, and a fourth hand valve on their respective side pipelines.

6. The processing system as described in claim 1, characterized in that, The bypass pipeline is connected to an online turbidity monitoring and analysis instrument, which is located at the end of the main water supply pipeline in the drainage direction.

7. The processing system as described in claim 1, characterized in that, Both the main water supply pipeline on the filter inlet side and the main water supply pipeline on the filter outlet side are equipped with remote differential pressure transmitters.

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