Tank furnace wiredrawing production line flow water recycling device

Abstract

The invention provides a tank furnace wire drawing production line flowing water recycling device, and relates to the technical field of tank furnace production flowing water recycling, and the tank furnace wire drawing production line flowing water recycling device comprises a condensate water collecting unit which is used for guiding condensate water generated by a central air conditioner air cabinet to a water storage tank through a PVC pipeline; the central air conditioner condensate water directly discharged into a sewage pipe network is collected, stored, treated and recycled and can be used as softened water raw water, when the air temperature is high in summer, a refrigerator needs to produce a large amount of chilled water, the chilled water needs to be recycled, and the energy consumption is low. The condensing pressure of equipment is high, the refrigerating capacity of a refrigerating machine is limited, the temperature of cooling circulating water can be reduced by recycling low-temperature condensate water to a cooling tower of refrigerating unit equipment, the temperature of unit cooling water is low, more heat of the equipment can be taken away, meanwhile, the condensing pressure of the refrigerating unit equipment can be reduced, and the refrigerating capacity of the refrigerating unit can be exerted to the maximum extent.

Description

Technical Field

[0001] This invention relates to the field of water recycling technology in pool kiln production lines, and more particularly to a water recycling device for pool kiln wire drawing production lines. Background Technology

[0002] In the glass fiber drawing process, the drawing workshop and the winding workshop require constant temperature and humidity control, and central air conditioning is needed year-round. When the fresh air passes through the cold end of the air handling unit, a lot of condensate is generated. The condensate is discharged directly into the sewage network through the air handling unit's drainage pipe, which is wasteful and increases the sewage flow and sewage treatment costs.

[0003] To achieve the objectives of this invention, the technical solution adopted is as follows: A method for recycling and utilizing central air conditioning condensate during glass fiber furnace drawing production. The air conditioning condensate is collected and stored, then pumped back to a river water pretreatment system, and finally sent to the emergency water tank of the circulating water station for reuse. This reduces the consumption of tap water during the enterprise's production process. Because the air conditioning condensate has a low temperature, it can also be used to replenish the cooling tower of the refrigeration unit during the high-temperature summer season, reducing the temperature of the circulating cooling water in the cooling tower. The low temperature of the circulating cooling water in the refrigeration unit also reduces the condensation pressure, maximizing the cooling capacity of the refrigeration unit, reducing the time required to operate two refrigeration units, and saving the enterprise's electricity consumption.

[0004] This invention collects and stores the condensate from the central air conditioning unit in a 20m³ container. 3 After passing through a Y-type filter, the water in the tank is sent to the river water pretreatment system of the circulating water station via a multi-stage vertical pump and UPVC pipe. The multi-stage vertical pump is controlled by a liquid level float. It only starts when the liquid level in the tank is high and stops pumping water when the liquid level is low to prevent the pump from running dry and burning out. The water flows into the river water pretreatment system, where polyacrylamide is added. After adsorption and sedimentation, it flows into the emergency water tank for use as raw water for softening. Summary of the Invention

[0005] To achieve the above objectives, the present invention proposes a device for recycling and utilizing the wastewater from a pool kiln wire drawing production line, comprising:

[0006] The condensate collection unit is used to divert the condensate generated by the central air conditioning unit to the storage tank through PVC pipes;

[0007] The storage and filtration unit includes a water outlet at the bottom of the storage tank, which is equipped with a valve and connected to a Y-type filter.

[0008] The delivery and control unit includes a Y-type filter connected to a multi-stage vertical pump via a pipeline. The outlet of the multi-stage vertical pump is supplied to the water point via a UPVC pipeline. The multi-stage vertical pump is started and stopped by a liquid level float control device. It starts when the water tank level is high and stops when the water level is low.

[0009] In the water treatment and utilization unit, the condensate is pumped to the river water pretreatment system of the circulating water station via a multi-stage vertical pump. After the polyacrylamide is added for adsorption and sedimentation, it flows into the emergency water tank and is used as the raw water for softening. During the high temperature in summer, some of the condensate is added to the cooling tower of the refrigeration unit to reduce the temperature of the circulating cooling water.

[0010] In one example, the PVC condensate collection pipe is equipped with an insulation layer, has a diameter of DN32, and an inclination angle of ≥3° to prevent water accumulation. The storage tank has a volume of 8m³. 3 PE plastic water tank.

[0011] In one example, the Y-type filter has a filter screen precision of 80-100 mesh and is equipped with a differential pressure alarm device. When the differential pressure exceeds 0.05 MPa, a backwashing procedure is triggered. The multi-stage vertical pump has a head of 50 m and a flow rate of 12 m³ / h. 3 / h, with an outlet diameter of DN50.

[0012] In one example, the liquid level float control device includes redundant water level detection probes. When the signal deviation between the two probes is greater than 5%, a fault alarm is triggered, and the backup control loop is automatically switched via PLC. The liquid level float control unit includes high liquid level triggered start and low liquid level triggered stop functions to avoid the water pump running dry.

[0013] In one example, the UPVC pipe is used to connect the water pump outlet to each point of use, ensuring corrosion resistance and long-term stability.

[0014] In one example, the river water pretreatment system includes a polyacrylamide dosing device to adsorb impurities in the precipitated condensate. The polyacrylamide dosing device includes an automatic metering pump, a dosing rate of 0.5-1.5 mg / L, and a stirrer to ensure sufficient reaction of the agent.

[0015] In one example, the emergency water tank receives treated condensate and uses it as raw water for softening in the production process.

[0016] In one example, the pipe that supplies water to the cooling tower of the refrigeration unit is equipped with an electric regulating valve. The electric regulating valve is controlled by a cooling water temperature sensor. When the water temperature in the tower is greater than 32°C, the water supply is automatically opened. In the summer, the device supplies low-temperature condensate to the cooling tower of the refrigeration unit to reduce the cooling water temperature and condensation pressure, thereby improving the energy efficiency of the refrigeration unit.

[0017] In one example, the device reduces wastewater discharge by recovering condensate, thereby lowering wastewater treatment costs and wastewater discharge taxes for businesses.

[0018] In one example, the device, in practical applications, recovers approximately 7000 m³ of condensate annually. 3 It generates economic benefits of approximately 9,600 yuan, with a recovery cost of 0.17 yuan / m². 3 .

[0019] The wastewater recycling device for pool kiln wire drawing production line proposed in this invention can bring the following beneficial effects:

[0020] 1. This invention collects and stores the condensate from central air conditioning systems that are directly discharged into the sewage network. After treatment, it is recycled and reused as raw water for softening. In summer, when the temperature is high, the chiller needs to produce a large amount of chilled water, resulting in high condensation pressure and limited cooling capacity. By recycling the low-temperature condensate to the cooling tower of the chiller unit, the temperature of the cooling circulating water can be reduced. The lower temperature of the cooling water can remove more heat from the equipment and reduce the condensation pressure of the chiller unit, thus maximizing the cooling capacity of the chiller unit.

[0021] 2. This invention collects and stores the condensate from central air conditioning units that are directly discharged into the sewage network, which can reduce the operating time of the two refrigeration units and reduce the power consumption of the refrigeration system to a certain extent. After the condensate is recovered, it does not flow into the sewage network, which can reduce the wastewater treatment cost of the enterprise and reduce the wastewater discharge tax to a certain extent. In summary, the recovery of central air conditioning condensate can bring certain economic benefits to the enterprise.

[0022] 3. This invention employs a redundant water level detection probe in its liquid level float control system. An alarm is triggered when the signal deviation exceeds 5%, and the PLC automatically switches to the backup circuit. This avoids system downtime caused by single-point failures, ensuring the reliability of the water pump's start-up and shutdown. The Y-type filter is equipped with a differential pressure alarm device. Backwashing is triggered when the differential pressure exceeds 0.05 MPa, regularly cleaning the filter screen and preventing impurities from entering the water pump, thus extending the equipment's service life. This reduces COD emissions by approximately 1.5 tons annually, significantly reducing the environmental burden on enterprises.

[0023] 4. This invention reduces wastewater discharge by 7000m³ 3 / year, directly reducing sewage treatment costs and sewage discharge taxes, meeting green production requirements. During the high temperatures of summer, the low-temperature condensate added to the cooling tower can reduce the circulating water temperature to ≤30℃, increasing the cooling capacity of a single unit by 15%, reducing the operation of one refrigeration unit by 400 hours / year, saving approximately 32,000 kWh of electricity, saving 24,000 yuan in electricity costs, and replacing part of the softened water raw water with condensate.

[0024] 5. This invention uses a PLC control system to achieve automated dynamic adjustment of polyacrylamide dosing (0.5-1.5 mg / L), backwashing process, and cooling tower water replenishment, reducing manual intervention and improving operational accuracy. The electric regulating valve automatically opens for precise water replenishment when the temperature exceeds 32°C, based on the cooling water temperature sensor signal, avoiding sudden drops in water temperature and ensuring efficient operation of the refrigeration system. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 This is a schematic diagram of the structure of a water recycling device for a pool kiln wire drawing production line according to the present invention. Detailed Implementation

[0027] To more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0028] Please refer to Figure 1 This invention proposes a condensate collection and utilization device for a filament drawing production line. The device consists of four main modules: a condensate collection unit, a storage and filtration unit, a conveying and control unit, and a water treatment and utilization unit, forming a closed-loop recycling system. Each unit works collaboratively to achieve efficient collection, purification, distribution, and reuse of condensate. The condensate collection unit is responsible for conveying the condensate generated by the central air conditioning unit to a storage tank via a dedicated pipeline. The storage and filtration unit temporarily stores, filters, and performs preliminary treatment on the condensate to ensure that the water quality meets subsequent usage standards. The conveying and control unit uses multi-stage vertical pumps to deliver the treated condensate to the point of use and achieves automated start-stop via liquid level control. The water treatment and utilization unit performs advanced treatment on the condensate and distributes it to the softened water system or the cooling tower of the refrigeration unit according to seasonal needs.

[0029] Detailed process flow: Condensate from the central air conditioning unit flows by gravity through a DN32 PVC insulated pipe at an incline of ≥3° to an 8m... 3 The PE plastic water tank prevents water accumulation and clogging. A manual valve is installed at the bottom outlet, connecting to a Y-type filter with an 80-100 mesh screen to intercept impurities and monitor pressure differential, triggering a backwashing process. The filtered condensate is then pumped by a multi-stage vertical pump with a head of 50m and a flow rate of 12m³ / h. 3 The water is pressurized at a rate of / h and transported to the circulating water station or cooling tower through a DN50 UPVC pipeline. The system features a liquid level float ball and redundant probes to monitor the water tank level in real time. The water pump starts when the liquid level is high and stops when the liquid level is low to avoid idling.

[0030] Water treatment and distribution: Condensate enters the river water pretreatment system, where 0.5-1.5 mg / L of polyacrylamide is added for adsorption and precipitation, and then flows into the emergency water tank as the source water for softening. When the cooling tower water temperature of the chiller unit is >32℃, the electric regulating valve automatically opens, and low-temperature condensate is added to the cooling tower to reduce the circulating water temperature and condensation pressure, thereby improving the refrigeration efficiency.

[0031] The key unit implementation method is the condensate collection unit, which uses DN32 PVC pipe with a 10mm thick polyurethane insulation layer to reduce heat loss from condensate and prevent condensation. The pipe is installed with a slope of ≥3% and a drainage funnel at the end to prevent silt and sand from accumulating and clogging. A stainless steel filter screen with a 2mm aperture is installed before the air handling unit drain pipe is connected to the water tank to intercept large particles of impurities. The filter screen is cleaned once a month to ensure smooth drainage.

[0032] The storage and filtration unit features a PE plastic storage tank that is corrosion-resistant and anti-aging, with a volume of 8m³. 3 The design liquid level range is 20%-90% of full capacity. A breather valve is installed at the top to prevent deformation due to negative pressure, and a flange connection valve is provided at the bottom outlet.

[0033] Y-type filter, installed between the water tank outlet and the water pump inlet, with a filter screen precision of 80-100 mesh, can intercept particles ≥150μm. Differential pressure alarm, differential pressure sensors are installed at the filter inlet and outlet. When the differential pressure is >0.05MPa, the backwashing program is triggered, which involves backwashing with clean water and discharging sewage. Maintenance cycle: check the filter screen condition every quarter, and clean it immediately after the differential pressure alarm.

[0034] Conveying and control unit, multi-stage vertical pump model CDL4-20, head 50m, flow rate 12m³ / h 3 / h, power 3kW, outlet diameter DN50, installation requirements: the pump body foundation uses rubber shock-absorbing pads, and the inlet and outlet pipes are equipped with flexible joints to reduce vibration transmission.

[0035] Liquid level float control: High liquid level setpoint: the water pump starts when the water tank level is ≥80%; Low liquid level setpoint: the pump stops when the liquid level is ≤20%. Redundant control: when the signal deviation between the two liquid level probes is >5%, the PLC switches to the backup circuit and alarms to avoid malfunctions. Piping system: UPVC pipe, PN1.0MPa, connecting the water pump outlet to the point of use. Rubber sealing rings are used at the flange connections to prevent leakage. An air vent valve is installed at the highest point of the pipeline, and a drain valve is installed at the lowest point for easy maintenance.

[0036] Water treatment and utilization unit, polyacrylamide dosing system, dosing device, peristaltic metering pump, dosage 0.5-1.5 mg / L, dynamically adjusted according to influent turbidity, mixing reaction, static pipeline mixer to ensure full contact between the agent and water, flocculation time ≥30 min, sedimentation tank, inclined tube sedimentation tank, sludge periodically discharged to thickening tank, emergency water tank, volume 50 m³ 3The cooling tower is made of fiberglass and features an internal baffle wall to prevent short-circuiting. The effluent water quality is turbidity ≤5 NTU and pH 6.5-8.5, meeting the requirements for softened water. The cooling tower water supply control system includes a temperature sensor installed on the main outlet pipe to monitor the water temperature in real time. An electric regulating valve receives signals from a PLC, and its opening degree is proportional to the temperature difference. The water supply logic prioritizes condensate water supply to the cooling tower during high summer temperatures, with a single supply volume ≤3 m³. 3 / h, to avoid a sudden drop in water temperature.

[0037] Control system design and debugging: PLC control logic, core controller: Siemens S7-1200 series PLC, configured with analog input module AI4×16bit and digital output module DO8×24V. Signal acquisition: liquid level signal, redundant probe 4-20mA connected to the AI ​​module, average value used as control basis; differential pressure signal, filter inlet and outlet differential pressure transmitter, range 0-0.1MPa, real-time monitoring; water temperature signal, cooling tower outlet water temperature sensor Pt100 detects water temperature; control strategy: water pump start / stop, starts when high liquid level ≥80% and differential pressure is normal, stops when low liquid level ≤20% or differential pressure exceeds 0.05MPa; backflushing trigger, starts the backflushing pump when differential pressure >0.05MPa for 5 minutes, flow rate 5m³ / h. 3 / h, lasting 10 minutes, cooling tower water replenishment, when water temperature > 32℃, the opening of the electric regulating valve is calculated and output by the PLC based on the temperature difference, human-machine interface (HMI), monitoring screen: displays real-time data such as liquid level, pressure difference, water temperature, water pump status, valve opening, etc. Faults such as excessive pressure difference, liquid level deviation > 5%, and abnormal water temperature trigger audible and visual alarms and record logs. Manual intervention is allowed, allowing operators to switch from automatic mode to manual control for debugging or emergency situations. Debugging steps: pipeline pressure test, UPVC pipeline system filled with water to 1. Five times the design pressure of 0.15MPa, pressure holding for 30 minutes without leakage, liquid level calibration, float switch and ultrasonic level gauge comparison calibration, error ≤±2%, water pump test, no-load operation for 5 minutes, vibration check ≤4.5mm / s, and noise ≤75dB, confirm correct rotation direction, automatic control joint debugging, simulate high / low liquid level signals, verify water pump start / stop logic, trigger differential pressure alarm, check backwash process, cooling tower linkage, set water temperature threshold of 32℃, gradually increase cooling tower load, observe electric valve response speed ≤5 seconds.

[0038] A case study of practical applications shows that the company's tank furnace wire drawing production line consumes approximately 200,000 cubic meters of water annually. 3 The central air conditioning system produces approximately 20 cubic meters of condensate water per day. 3 The original condensate was directly discharged into the sewage pipe network, which led to an increase in sewage treatment volume and an increase in annual treatment costs of about 120,000 yuan. In summer, due to the excessively high cooling water temperature (>35℃), two units of the refrigeration unit need to be turned on, resulting in a surge in power consumption.

[0039] Implementation results: 7000m³ of condensate water recovered annually. 3 Reduce sewage discharge by 7000m³ 3 This saves on wastewater treatment costs, at a unit price of 3.2 yuan / m³. 3 The cost is approximately 22,400 yuan. Summer low-temperature condensate is added to the cooling tower, lowering the cooling water temperature to ≤30℃, increasing the cooling capacity of a single unit by 15%, reducing the operating time of one unit by approximately 400 hours / year, and saving approximately 32,000 kWh of electricity. At an electricity price of 0.75 yuan / kWh, this translates to electricity cost savings of 24,000 yuan. The total benefit = water saving benefit of 22,400 yuan + electricity saving benefit of 24,000 yuan + benefit from replacing tap water with softened water (7000m³). 3 ×1.55 yuan / m 3 ×30% = 49,900 yuan, annual recovery cost 0.17 yuan / m² 3 Including chemicals, electricity, and maintenance, the net profit is approximately 9,600 yuan per year, and COD emissions are reduced by approximately 1.5 tons per year, calculated based on a wastewater COD concentration of 200 mg / L.

[0040] Operational optimization measures and seasonal adjustments: When condensate volume decreases in winter, the cooling tower water supply loop is shut off to prioritize the supply of softened water. Chemical optimization: The dosage of polyacrylamide is adjusted according to water quality, increasing to 1.2 mg / L during the rainy season and decreasing to 0.8 mg / L during the dry season. Troubleshooting: A problem of liquid level probe signal drift occurred, which was resolved by adding a shielding layer and replacing it with an armored cable.

[0041] Quarterly maintenance includes cleaning the Y-type filter screen, replacing damaged sealing rings, checking the water pump mechanical seal, replenishing lubricating oil, calibrating the level gauge and temperature sensor, and recalibrating if the error is > ±2%. Annual overhaul involves disassembling the water pump, checking the impeller wear (allowable wear ≤ 2mm), cleaning the inside of the storage tank, checking the corrosion of the PE sheet, replacing the cooling tower water supply solenoid valve, and testing the PLC backup battery's endurance.

[0042] Emergency Response Plan: In case of pump failure, activate the backup pump, immediately shut down for maintenance; in case of pipeline leakage, close upstream and downstream valves, drain the medium and replace the sealing gasket; in case of control system failure, switch to manual mode, maintain basic functions, and restore automatic operation within 24 hours.

[0043] The following figure compares the emission schemes with traditional emission schemes.

[0044]

[0045] Condensate collection unit, pipe material and size: PVC pipes are used because PVC has advantages such as corrosion resistance, low cost and easy installation. An insulation layer is added to the pipes to prevent condensate from re-evaporating due to temperature changes during transmission, which would affect the recovery efficiency. Inclination angle: The pipes must be laid at an inclination angle of at least 3° to ensure that the condensate can flow smoothly and avoid water accumulation.

[0046] The design of the blower unit connection and drainage system, including interface treatment, involves sealing the connection between the blower unit drain outlet and the PVC pipe with a rubber sealing ring and securing it with a stainless steel hose clamp at a torque of 15-20 N·m to prevent water leakage at the connection. A 2mm aperture stainless steel filter screen is installed before the interface, which is disassembled and cleaned monthly to intercept any fiber impurities that may fall out of the blower unit. Gravity drainage is optimized, with the water tank installed at least 2.5 meters below the blower unit drain outlet to collect condensate by gravity, reducing energy consumption. The total length of the drainage pipe is controlled within 50 meters to avoid increased water flow resistance due to excessive pipe length, which would affect collection efficiency.

[0047] The liquid level monitoring system includes a dual-channel ultrasonic level gauge installed inside the water tank, with a range of 0-8m and an accuracy of ±2mm. This gauge monitors the liquid level in real time. The level signal is transmitted to the PLC controller via a 4-20mA current loop. The average value of the two signals is used as the control basis. For safety protection, if the deviation between the two level gauge signals exceeds 5%, the PLC triggers an audible and visual alarm and automatically switches to the backup level gauge control loop. A DN50 overflow pipe is installed at the top of the water tank, with the overflow level set to 95% of the tank height to prevent overflow due to excessive liquid level.

[0048] The storage and filtration unit is implemented, and the material and structure of the storage tank are designed to be 8m. 3 This PE plastic water tank is made of linear low-density polyethylene, which is resistant to acids and alkalis (pH 4-12) and UV aging. The tank bottom features a 15° conical angle to facilitate sediment collection near the outlet. The foundation is constructed of C25 concrete, measuring 3m x 3m with a thickness of 300mm. The flatness error of the foundation top surface is ≤5mm. A 200mm high water-retaining edge is installed around the foundation to prevent condensate leakage in case of tank leaks. An air vent valve with a ventilation capacity of 50m³ is installed on the top of the tank. 3 / h, to prevent negative pressure from forming inside the water tank when water enters; a DN50 manhole is opened on the side for easy regular maintenance of the internal structure; when the outlet flange PN1.0MPa is connected to the valve, an acid and alkali resistant rubber gasket is used for sealing.

[0049] Y-type filter system, technical parameters: The filter body is made of UPVC, the filter screen is 80 mesh with a pore size of 0.18mm, capable of intercepting particulate impurities ≥180μm. Pressure sensors are installed at the inlet and outlet, with a range of 0-0.1MPa and an accuracy of 0.5 class, to monitor the differential pressure in real time. Backwash control: When the differential pressure > 0.05MPa for 5 minutes, the PLC triggers the backwash program, closing the filter inlet valve and opening the DN25 backwash valve. The filter screen is backwashed for 10 minutes using the plant's fire water pressure ≥0.3MPa, with a flushing flow rate of 5m³ / h. 3 / h, after backwashing is completed, it will automatically switch back to normal operation mode. Every quarter, the filter end cover should be removed to check the wear of the filter screen. When the damaged area of ​​the filter screen is greater than 5%, a new filter screen should be replaced. In actual application, in summer, due to the high air humidity and high impurity content of condensate, the backwashing frequency is about once a week, while in winter it is reduced to once every two weeks.

[0050] The conveying and control unit utilizes a CDL4-20 multistage vertical centrifugal pump system with a power of 3kW and a speed of 2900r / min. The pump body is made of 304 stainless steel, and the impeller features a closed design, suitable for conveying clean condensate. Flexible rubber joints (DN50) are installed at the pump inlet and outlet to reduce vibration and noise; the measured operating noise is ≤75dB. The pump foundation is constructed with 200mm thick concrete, and an 8mm thick rubber shock-absorbing pad is laid on the top surface. Supports are installed on the pump inlet and outlet pipes, with a distance of ≤500mm from the pump body flange to prevent the weight of the pipes from directly impacting the pump body. During normal operation, the pump outlet pressure is 0.4-0.5MPa, and the flow rate is 12m³ / h. 3 / h, motor current ≤6A. After the pump has run for more than 5000 hours, the mechanical seal (model 120-50) needs to be replaced and the bearing lubricant replenished.

[0051] The liquid level float control system is equipped with two independent float level switches, installed at 80% and 20% of the water tank level respectively. When the signals from the two switches are inconsistent, the PLC automatically switches to the backup circuit and triggers an alarm with a 10-second delay. When the water tank level is ≥80% and the filter pressure difference is <0.05MPa, or when the level is ≤20% or the pressure difference is ≥0.05MPa, the water pump stops. To avoid frequent pump starts and stops due to level fluctuations, a 5% level lag interval is set, meaning that after starting at a high level, the pump must be <75% before it can stop again. When the pump runs continuously for more than 4 hours, the PLC automatically issues a rotation operation prompt. For dual-pump configuration systems, when the motor temperature is >75℃, the thermal relay activates, forcibly stopping the pump and triggering an alarm.

[0052] The UPVC piping system uses UPVC pipes, and the pipe connections are made using socket bonding. Before bonding, the interface surface must be cleaned with acetone. When connecting flanges, acid and alkali resistant rubber gaskets are used, and the bolt torque is controlled at 10-15 N·m. The main pipe is laid overhead along the factory columns at a height of 2.5 meters above the ground. Branch pipes are fixed with hangers. A DN15 air vent valve is installed at the highest point of the pipe, and a DN20 drain valve is installed at the lowest point to facilitate the drainage of accumulated water during system maintenance. The outside of the pipes is wrapped with fiberglass cloth and sun-proof paint, with a weather resistance of ≥5000 hours to prevent the UPVC material from aging and cracking due to ultraviolet radiation. In practical applications, the outdoor pipes need to be repainted with sun-proof paint every two years.

[0053] The water treatment and utilization unit includes a polyacrylamide dosing device for adsorbing impurities in the precipitated condensate to improve water quality, and an emergency water tank that serves as a raw water storage tank for softened water used in the production process.

[0054] A mixer is installed in the river water pretreatment system to ensure that the reagents react fully. The process is automated, with the dosing and mixing processes controlled by a PLC system.

[0055] Dosage control: Adjust the dosage of polyacrylamide according to the water quality of the condensate, usually 0.5-1.5 mg / L. Water quality monitoring: Regularly test the water quality of the treated condensate to ensure that it meets the production process requirements.

[0056] The fifth cooling tower water supply unit includes an electric regulating valve to control the flow rate of low-temperature condensate into the cooling tower of the refrigeration unit, and a temperature sensor to monitor the water temperature inside the cooling tower in real time and control the opening and closing of the electric regulating valve accordingly.

[0057] Piping layout: The water supply pipes should be laid out reasonably to ensure smooth water flow and not affect the normal operation of the cooling tower. Electrical connections: Ensure the electrical connections of the temperature sensor and electric regulating valve are correct.

[0058] Temperature-controlled water replenishment automatically starts when the water temperature inside the tower exceeds 32℃, reducing the cooling water temperature and condensing pressure, resulting in energy savings. The application of this unit can significantly improve the energy efficiency of the refrigeration unit and reduce energy consumption.

[0059] In this embodiment, the recycling device operates by diverting condensate from the central air conditioning unit to an 8m high-temperature zone via a PVC pipe. 3 A PE plastic water tank with a valve installed at the bottom outlet, connected to a Y-type filter and a multi-stage vertical pump with a head of 50m and a flow rate of 12m³ / h. 3The pump operates at a rate of / h, with an outlet diameter of DN50. The pump outlet pipe is connected to each water point via UPV piping. The multi-stage vertical pump is controlled by a level float. In the pretreatment system, 0.5-1.5 mg / L of polyacrylamide is added for adsorption and sedimentation. The treated water flows into the emergency water tank as raw water for softening. In summer, when the cooling tower water temperature exceeds 32℃, low-temperature condensate is automatically replenished into the cooling tower via an electric regulating valve to reduce the circulating water temperature and condensation pressure. The pump only starts when the water tank level is high and stops pumping when the level is low to prevent the pump from running dry and burning out. This system can collect 7000 m³ of condensate annually after one year of operation. 3 The water fee is approximately 1.55 yuan / m³. 3 The electricity cost is 0.75 yuan / kWh, and the cost of condensate recovery is 0.17 yuan / m³. 3 Includes the cost of pharmaceuticals, electricity for the multi-stage vertical pump, and 7000m³ per year. 3 The condensate water can generate economic benefits of approximately 9,600 yuan.

[0060] Of course, the present invention may have many other embodiments. Based on this embodiment, other embodiments obtained by those skilled in the art without any creative effort are all within the scope of protection of the present invention.

Claims

1. A device for recycling and utilizing wastewater from a pool kiln wire drawing production line, characterized in that, include: The condensate collection unit is used to divert the condensate generated by the central air conditioning unit to the storage tank through PVC pipes; The storage and filtration unit includes a water outlet at the bottom of the storage tank, which is equipped with a valve and connected to a Y-type filter. The delivery and control unit includes a Y-type filter connected to a multi-stage vertical pump via a pipeline. The outlet of the multi-stage vertical pump is supplied to the water point via a UPVC pipeline. The multi-stage vertical pump is started and stopped by a liquid level float control device. It starts when the water tank level is high and stops when the water level is low. In the water treatment and utilization unit, the condensate is pumped to the river water pretreatment system of the circulating water station via a multi-stage vertical pump. After the polyacrylamide is added for adsorption and sedimentation, it flows into the emergency water tank and is used as the raw water for softening. During the high temperature in summer, some of the condensate is added to the cooling tower of the refrigeration unit to reduce the temperature of the circulating cooling water.

2. The device for recycling and utilizing wastewater from a pool kiln wire drawing production line according to claim 1, characterized in that, The PVC condensate collection pipe is equipped with an insulation layer, has a diameter of DN32, and an inclination angle of ≥3° to prevent water accumulation. The storage tank has a volume of 8m³. 3 PE plastic water tank.

3. The device for recycling and utilizing wastewater from a pool kiln wire drawing production line according to claim 1, characterized in that, The Y-type filter has a filter screen precision of 80-100 mesh and is equipped with a differential pressure alarm device. A backwashing procedure is triggered when the differential pressure exceeds 0.05 MPa. The multi-stage vertical pump has a head of 50 m and a flow rate of 12 m³ / h. 3 / h, with an outlet diameter of DN50.

4. The device for recycling and utilizing wastewater from a pool kiln wire drawing production line according to claim 1, characterized in that, The liquid level float control device includes redundant water level detection probes. When the signal deviation between the two probes is greater than 5%, a fault alarm is triggered. The PLC automatically switches to the backup control loop. The liquid level float control unit includes high liquid level trigger start and low liquid level trigger stop functions to avoid the water pump running dry.

5. The device for recycling and utilizing wastewater from a pool kiln wire drawing production line according to claim 1, characterized in that, The UPVC pipes are used to connect the water pump outlet to each water point, ensuring corrosion resistance and long-term stability.

6. The device for recycling and utilizing wastewater from a pool kiln wire drawing production line according to claim 1, characterized in that, The river water pretreatment system includes a polyacrylamide dosing device to adsorb and precipitate impurities in the condensate. The polyacrylamide dosing device includes an automatic metering pump with a dosing rate of 0.5-1.5 mg / L and is equipped with a stirrer to ensure the reagent reacts fully.

7. The device for recycling and utilizing wastewater from a pool kiln wire drawing production line according to claim 1, characterized in that, The emergency water tank receives the treated condensate and uses it as raw water for softening in the production process.

8. A device for recycling and utilizing wastewater from a pool kiln wire drawing production line according to claim 1, characterized in that, The pipe that supplies water to the cooling tower of the refrigeration unit is equipped with an electric regulating valve. The electric regulating valve is controlled by a cooling water temperature sensor. When the water temperature in the tower is greater than 32°C, it automatically opens to supply water. In the summer, the device supplies low-temperature condensate to the cooling tower of the refrigeration unit to reduce the cooling water temperature and condensation pressure, thereby improving the energy efficiency of the refrigeration unit.

9. A device for recycling and utilizing wastewater from a pool kiln wire drawing production line according to claim 1, characterized in that, The device recovers condensate to reduce wastewater discharge, thereby lowering wastewater treatment costs and wastewater discharge taxes for businesses.

10. A device for recycling and utilizing wastewater from a pool kiln wire drawing production line according to claim 1, characterized in that, In practical applications, the device recovers approximately 7000 m³ of condensate annually. 3 It generates economic benefits of approximately 9,600 yuan, with a recovery cost of 0.17 yuan / m². 3 .

Images