Cooling system for recycling industrial water

Abstract

The industrial water recycling cooling system comprises a device body, the top of the device body is provided with a water supply pipe and a water collecting tank, and the bottom of the water collecting tank is sequentially provided with a front filter screen and a self-cleaning filter screen; a CO2 descaling box is connected below the self-cleaning filter screen, and CO2 inlets are formed in the two sides of the box body; a spray cooling box is arranged at the bottom of the CO2 descaling box, a spray pipe and an atomizing nozzle are arranged at the top of the box, a circulating fan is arranged outside the box, and a dry fin heat exchanger is mounted in the box; the bottom of the dry-type fin heat exchanger is connected with a threaded pipe cooling box; a threaded pipe is arranged in the box and cooling saline water is injected; a spiral fin heat dissipation box is arranged below the threaded pipe cooling box, and an S-shaped bent pipe with heat dissipation fins is installed in the spiral fin heat dissipation box; a cooling pure water tank is arranged at the bottom of the spiral fin radiating box; a cold water outlet is formed in one side of the box body. By means of multi-stage filtration, CO2 descaling and four-stage cooling, efficient recycling of cooling water is achieved, and the water-saving anti-scaling cooling system has the comprehensive advantages of being high in water-saving rate, good in anti-scaling effect, stable in heat dissipation efficiency and low in maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of industrial cooling and water circulation technology, specifically to an industrial water recycling cooling system. Background Technology

[0002] In industrial production, cooling systems are crucial for equipment operational stability. Traditional cooling systems generally suffer from the following problems: high water consumption and low recycling rate; easy scaling of circulating water, affecting heat exchange efficiency and requiring frequent cleaning or chemical dosing; limited heat dissipation methods, making it difficult to adapt to load changes; and easy clogging of filter components, requiring frequent maintenance. Therefore, an integrated system capable of filtration, descaling, multi-stage cooling, and recycling is needed to improve water resource utilization, reduce scaling, enhance heat dissipation stability, and lower maintenance costs. Summary of the Invention

[0003] The purpose of this invention is to provide an industrial water recycling cooling system that solves the problems of high water consumption, easy scaling, low heat dissipation efficiency and frequent maintenance in existing systems.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an industrial water recycling cooling system, comprising a device body, a water supply pipe and a water collection tank at the top of the device body, a pre-filter at the bottom of the water collection tank, a slag removal port on the side of the pre-filter, and a self-cleaning filter at the bottom of the pre-filter; a CO2 descaling box at the bottom of the self-cleaning filter, with CO2 inlets on both sides of the CO2 descaling box; a spray cooling box at the bottom of the CO2 descaling box, with a spray pipe and multiple atomizing nozzles at the top of the spray cooling box, and a circulating air supply on the outer side of the spray cooling box. The machine includes a circulating fan connected to a circulating motor, and air vents on the side wall of the spray cooling box through which the circulating fan supplies air. Inside the spray cooling box is a dry finned heat exchanger, and at the bottom of the dry finned heat exchanger is a threaded tube cooling box containing a threaded tube filled with cooling brine. At the bottom of the threaded tube cooling box is a spiral finned heat sink containing a bent tube with heat sink fins. At the bottom of the spiral finned heat sink is a cooling pure water tank with a cold water outlet on one side of its bottom.

[0005] Preferably, the dry finned heat exchanger is made of copper-steel composite material and manufactured by explosive welding process, and its internal flow channel has a louvered structure.

[0006] Preferably, the particle size of the water atomized by the atomizing nozzle is 50-80 μm.

[0007] Preferably, the pore size of the self-cleaning filter is 50 μm.

[0008] Preferably, the CO2 inlet is used to introduce CO2 into the CO2 descaling tank to adjust the pH value of the circulating water to 7.0-7.5.

[0009] Preferably, the bend has an S-shaped structure and multiple heat sinks on its outer wall.

[0010] The working process of this invention is as follows: The industrial hot water to be treated first enters the top collection tank, with a small amount of fresh water added as needed. The water first passes through a pre-filter to intercept large particles such as silt and metal shavings; these impurities are periodically discharged through a side cleaning port. Subsequently, the water flows into a self-cleaning filter to remove finer suspended solids (such as particles as small as 50μm). This filter automatically backwashes itself via differential pressure sensing, requiring no manual intervention and ensuring continuous and stable system operation.

[0011] Filtered clean water enters the CO2 descaling tank. Carbon dioxide gas is introduced into the water through CO2 inlets on both sides of the tank, precisely adjusting the pH of the circulating water to a slightly acidic range (7.0-7.5). This process converts calcium and magnesium ions, which are prone to scaling in the water, into soluble bicarbonates, fundamentally inhibiting the formation of calcium carbonate scale, thus replacing the traditional sulfuric acid adjustment process which carries pollution risks.

[0012] After descaling, the water temperature is gradually reduced to the required range through four methods: Primary cooling (spray evaporative cooling): The descaled water is pumped to the top of the spray cooling tank, where it is atomized into an extremely fine water mist (50-80μm particle size) through atomizing nozzles, greatly increasing the contact area between the water and the air. At the same time, a circulating fan forces cold air into the tank, causing the water mist to evaporate rapidly and absorb a large amount of heat, achieving initial cooling.

[0013] Secondary cooling (finned heat exchange cooling): Water mist and water flow make full contact with the dry finned heat exchanger inside the chamber. This heat exchanger uses high thermal conductivity materials and a flow channel design with increased heat exchange area to further and efficiently remove heat from the water.

[0014] Three-stage cooling (forced brine cooling): Initially cooled water flows into the threaded tubes inside the threaded tube cooling box. Low-temperature cooling brine (such as calcium chloride solution) flows outside the tubes. Utilizing the low freezing point and high specific heat capacity of the brine, efficient indirect heat exchange is carried out through the tube walls, forcibly reducing the water temperature to near the process requirements.

[0015] Fourth-stage cooling (natural air cooling): Finally, the water flows into the S-shaped bend inside the spiral finned heatsink. The heatsink fins attached to the outer wall of the bend significantly increase the heat dissipation area. Through natural convection heat exchange with the ambient air, the water temperature is finally precisely adjusted and stabilized.

[0016] Collection and Recycling: The low-temperature pure water that has completed the entire cooling process is finally collected in the cooling pure water tank, and then pumped back to the industrial equipment through the cold water outlet to absorb heat, turning into hot water and then entering the beginning of this system, thus forming a complete and efficient recycling loop.

[0017] The beneficial effects of this invention are as follows: (1) This invention integrates functions such as "filtration, descaling, and multi-stage cooling" into a closed loop, which greatly reduces the evaporation loss and sewage discharge of water resources and greatly improves the utilization rate of circulating water. At the same time, it innovatively uses CO2 to replace traditional chemical agents such as sulfuric acid for pH adjustment and descaling, avoiding the discharge of highly acidic wastewater and chemical residues, and realizing clean production.

[0018] (2) The present invention adopts a multi-stage cooling mode that combines spray evaporation, fin heat exchange, brine cooling and natural heat dissipation, which can flexibly cope with fluctuations in ambient temperature and changes in equipment load. This design breaks the limitations of a single cooling method, improves the overall heat exchange efficiency of the equipment, and provides a stable and reliable cooling guarantee for industrial production.

[0019] (3) The combined application of the pre-filter and the self-cleaning filter in this invention enables automatic interception and cleaning of large particulate impurities and fine suspended matter, avoiding pipe and equipment blockage and significantly reducing the frequency and workload of manual cleaning. Combined with the effective inhibition of scale by CO2 descaling technology, the scaling rate inside the equipment is significantly reduced, which extends the maintenance cycle of the main heat exchange components, thereby saving maintenance costs and reducing production losses caused by downtime for cleaning. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; In the diagram: 1-device body, 2-water supply pipe, 3-water collection tank, 4-pre-filter, 5-slag removal port, 6-self-cleaning filter, 7-CO2 descaling box, 8-CO2 inlet, 9-spray cooling box, 10-spray pipe, 11-atomizing nozzle, 12-circulating fan, 13-circulating motor, 14-air vent, 15-dry finned heat exchanger, 16-threaded tube cooling box, 17-threaded tube, 18-spiral finned heat sink, 19-heat sink, 20-bend, 21-cooling pure water tank, 22-cold water outlet. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] like Figure 1As shown, this industrial water recycling cooling system includes a device body 1, with a water supply pipe 2 and a water collection tank 3 installed at the top. Industrial hot water enters the water collection tank 3, and makeup water is added through the water supply pipe 2. A pre-filter 4 is installed at the bottom of the water collection tank 3 to intercept large particles of impurities, which are discharged through a slag removal port 5 on the side. Below the pre-filter 4 is a self-cleaning filter 6, which filters fine suspended solids and has an automatic backwashing function.

[0023] The self-cleaning filter 6 is connected to a CO2 descaling tank 7 at its bottom. CO2 inlets 8 are located on both sides of the tank, allowing CO2 to be introduced to adjust the pH of the water and inhibit scale formation. Below the CO2 descaling tank 7 is a spray cooling tank 9, with a spray pipe 10 and multiple atomizing nozzles 11 installed on its top to atomize water into fine particles of 50-80μm. A circulating fan 12, driven by a circulating motor 13, is installed on the outer wall of the spray cooling tank 9, supplying cool air into the tank through air vents 14 to achieve initial heat exchange between the water mist and the air.

[0024] The spray cooling box 9 is equipped with a dry finned heat exchanger 15, which uses a copper-steel composite material and louvered flow channels to enhance heat exchange efficiency. The bottom of the dry finned heat exchanger 15 is connected to a threaded tube cooling box 16, which is filled with cooling brine to indirectly cool the water in the threaded tubes 17. Below the threaded tube cooling box 16 is a spiral finned heat sink 18, which contains S-shaped bends 20 with heat dissipation fins 19 for further cooling through natural heat dissipation. Finally, the cooled water enters a cooling pure water tank 21 and is discharged to industrial equipment through a cold water outlet 22 for recycling.

[0025] Example: Retrofitting project of the cooling system of a chemical plant's reactor This industrial water recycling cooling system adopts a modular design, with the overall dimensions of unit 1 being 5m long × 3m wide × 8m high. Unit 1 consists of a carbon steel support frame and corrosion-resistant panels, with the internal components arranged according to functional zones.

[0026] The top of the device body 1 is equipped with a water collection tank 3, which is made of S30408 ​​stainless steel and has a volume of 2.5m³. 3 A water supply pipe 2 with a nominal diameter of DN80 is installed on one side of the water collection tank, equipped with an electric regulating valve, which can automatically replenish fresh water according to the water level sensor signal. The bottom of the water collection tank is conical to facilitate the collection of impurities.

[0027] The bottom of the water collection tank 3 is connected to a pre-filter screen 4. This filter screen has a double-layer stainless steel woven mesh structure with a pore size of 1.2mm × 1.2mm and is installed at a 15° angle to facilitate impurities sliding down to the side cleaning port 5. The cleaning port uses automatic control to periodically discharge slag, and the slag discharge interval can be input.

[0028] A self-cleaning filter 6 is vertically installed below the pre-filter 4, with a filtration accuracy of 50μm. This filter is equipped with a differential pressure sensor, which automatically initiates the backwashing procedure when the pressure difference across the filter reaches 0.05MPa. The backwash water source is the system's own purified circulating water, and the backwashing duration is 30 seconds. The drain valve has a diameter of DN50.

[0029] The self-cleaning filter 6 is connected to the CO2 descaling tank 7 at its outlet, and is made of PVC. CO2 inlets 8 are symmetrically located on both sides of the tank, 200mm from the bottom. Mass flow meters and electric regulating valves are installed on the inlet pipes. The effluent from the CO2 descaling tank 7 enters the spray cooling tank 9 through a DN100 pipe. The spray cooling tank measures 2.8m × 2.8m × 3.2m, and the tank walls are made of S30408 ​​material. Three spray pipes 10 are arranged in parallel on the top of the tank, each spray pipe is equipped with 10 atomizing nozzles 11, and the nozzle spacing is 250mm.

[0030] A circulating fan 12 is installed on the right side wall of the spray cooling box 9, and the fan is driven by a circulating motor 13. Twenty-four air holes 14 with a diameter of 120mm are opened on the side of the box, arranged in a matrix, and guide vanes are installed in the holes.

[0031] A dry-type finned heat exchanger 15 is centrally installed inside the spray cooling box 9. The heat exchanger uses high-efficiency finned heat exchange tubes made of T2 copper. The fin spacing is 3.2mm, and it adopts a louvered opening design with an opening angle of 25°.

[0032] The outlet of the dry finned heat exchanger 15 is connected to a threaded pipe cooling box 16. The box has a double-layer insulation structure, with the inner liner made of S30408 ​​material and the interlayer filled with polyurethane foam insulation material. Four sets of threaded pipes 17 are arranged inside the box.

[0033] Below the threaded tube cooling box 16 is a spiral finned heat sink 18, which contains six sets of S-shaped bends 20 with heat sink fins 19. The bends are made of aluminum-magnesium alloy, with an outer diameter of 32mm and a wall thickness of 1.5mm. The heat sink fins have a serrated design with a fin spacing of 4mm.

[0034] The system is equipped with a PLC automatic control system, and the following key control points are set in the system: pH control: An online pH sensor is installed inside the CO2 descaling tank 7, with a sampling frequency of 1 time / second. When the pH value is higher than 7.4, the opening of the CO2 inlet valve is increased; when it is lower than 7.0, the opening is decreased to maintain the pH value within the range of 7.2±0.2.

[0035] Temperature interlock: Pt100 temperature sensors are installed at the outlets of each cooling unit. When the final outlet water temperature exceeds the set value by 1°C, the circulating fan speed is increased; when it exceeds the set value by 2°C, the standby brine unit is started.

[0036] Differential pressure protection: When the differential pressure across the self-cleaning filter 6 reaches 0.08MPa, the system will automatically alarm and reduce the water inflow.

[0037] The above are merely preferred embodiments of the present invention. It should be noted that, for those skilled in the art, based on the technical teachings provided by the present invention and as common knowledge in the mechanical field, other equivalent modifications and improvements can be made, and these should also be considered within the scope of protection of the present invention.

Claims

1. An industrial water recycling cooling system comprising a unit (1) characterised in that: The device body (1) top is equipped with water supply pipe (2) and water collecting tank (3), the water collecting tank (3) bottom is equipped with front filter screen (4), the front filter screen (4) side is equipped with clean residue port (5), the front filter screen (4) bottom is equipped with self-cleaning filter screen (6), the self-cleaning filter screen (6) bottom is equipped with CO2 descaling box (7), the CO2 descaling box (7) both sides are equipped with CO2 inlet (8), the CO2 descaling box (7) bottom is equipped with spray cooling box (9), the spray cooling box (9) top is equipped with spray pipe (10) and multiple atomizing nozzles (11), the spray cooling box (9) outer side is equipped with circulating fan (12), the circulating fan (12) is connected with circulating motor (13), the spray cooling box (9) side wall is equipped with air hole (14), the circulating fan (12) supplies air to the spray cooling box (9) through the air hole (14), the spray cooling box (9) inside is equipped with dry fin heat exchanger (15), the dry fin heat exchanger (15) bottom is equipped with screw pipe cooling box (16), the screw pipe cooling box (16) is equipped with screw pipe (17), the screw pipe cooling box (16) is injected with cooling brine, the screw pipe cooling box (16) bottom is equipped with spiral fin heat dissipation box (18), the spiral fin heat dissipation box (18) is equipped with elbow pipe (20) with fin (19), the spiral fin heat dissipation box (18) bottom is equipped with cooling pure water tank (21), the cooling pure water tank (21) bottom one side is equipped with cold water outlet (22).

2. An industrial water recycling cooling system according to claim 1, characterised in that: The dry fin heat exchanger (15) is made of copper-steel composite material by explosion welding process, and its internal flow channel is louvered structure.

3. An industrial water recycling cooling system as claimed in claim 1 or 2, characterised in that: The particle size of the atomizing nozzle (11) is 50-80 μm.

4. An industrial water recycling cooling system according to claim 3, wherein: The filter aperture of the self-cleaning filter screen (6) is 50 μm.

5. An industrial water recycling cooling system according to claim 4, wherein: The CO2 inlet (8) is used for introducing CO2 into the CO2 descaling box (7) to adjust the pH value of the circulating water to 7.0-7.

5.

6. An industrial water recycling cooling system according to claim 5, wherein: The elbow pipe (20) is S-shaped structure, and the outer wall is provided with multiple fins (19).

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