Zero liquid discharge cooling water system with make-up device

Abstract

The application discloses a zero-discharge cooling water system with a water supplement device, which comprises a cooling water system, a filter for performing preliminary filtration on sewage discharged from the cooling water system, a sewage sedimentation tank for storing the filtered sewage, a clean water tank for storing generated clean water, an ultrafiltration membrane assembly for filtering the clean water delivered by the clean water tank, an ultrafiltration water tank for storing generated ultrafiltration water, a nanofiltration membrane assembly for filtering the ultrafiltration water delivered by the ultrafiltration water tank, and a pure water tank for storing generated pure water, wherein the generated pure water is delivered to the cooling water system. The generated pure water is supplemented into the cooling water system again after being treated from the sewage discharged from the cooling water system, so that the zero-discharge effect is realized. The sewage is treated by the ultrafiltration membrane assembly and the nanofiltration membrane assembly, so that calcium and magnesium ions, metal ions and chlorine ions are effectively removed from the generated pure water, and then the pure water is applied to the cooling water system again, so that the problems of scaling and plugging and corrosion of the cooling water system are effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, and in particular to a zero-sewage cooling water system with a water replenishment device. Background Technology

[0002] In traditional circulating cooling water systems, large amounts of scale inhibitors, corrosion inhibitors, and bactericides are often continuously added to inhibit scaling, corrosion, and microbial growth. The reaction products of these agents can easily cause excessive levels of COD, phosphorus pollutants, and total dissolved solids, leading to secondary pollution. Furthermore, to compensate for losses from evaporation, airflow, and blowdown, makeup water needs to be added to the cooling water system. Conventional makeup water is usually municipal tap water or groundwater, which contains calcium... 2+ Mg 2+ Hardness ions and Cl — SO4 2— The system contains a high concentration of corrosive ions. As the system concentration factor increases, these ions are continuously enriched, and hardness ions easily crystallize and precipitate on the heat exchanger surface, forming dense scale and reducing heat transfer efficiency; Cl — SO4 2— Such substances can penetrate the corrosion inhibitor film, inducing pitting corrosion, crevice corrosion, and even stress corrosion cracking, posing a particularly serious threat to sensitive components such as indirect evaporative coolers and plate heat exchangers made of aluminum foil, aluminum alloys, or thin-walled stainless steel. Therefore, to alleviate these problems, sodium ion exchange-treated softened water is often used as a supplementary water source in engineering.

[0003] However, the water replenishment process of the cooling water system in the existing technology still has many problems. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a zero-drainage cooling water system with a water replenishment device, thereby reducing the damage caused by water replenishment to the cooling water system and achieving zero drainage of the cooling water system.

[0005] To address the aforementioned problems, this utility model provides a zero-sewage-discharge cooling water system with a water replenishment device, comprising: a cooling water system; a filter connected to the cooling water system for preliminary filtration of wastewater discharged from the cooling water system; a wastewater sedimentation tank connected to the filter for storing the filtered wastewater; a clear water tank connected to the wastewater sedimentation tank for storing the clear water generated after the wastewater has settled in the sedimentation tank; and an ultrafiltration membrane assembly. The system includes: a clean water tank, connected to the clean water tank for filtering the clean water supplied by the clean water tank; an ultrafiltration water tank, connected to the ultrafiltration membrane assembly for storing ultrafiltration water generated after the ultrafiltration membrane assembly filters the clean water; a nanofiltration membrane assembly, connected to the ultrafiltration water tank for filtering the ultrafiltration water supplied by the ultrafiltration water tank; and a pure water tank, connected to both the nanofiltration membrane assembly and the cooling water system for storing pure water generated after the nanofiltration membrane assembly filters the ultrafiltration water, and the generated pure water is supplied to the cooling water system.

[0006] Optionally, the clear water generated after sedimentation in the wastewater sedimentation tank overflows into the clear water tank.

[0007] Optionally, the ultrafiltration water includes: primary ultrafiltration water and secondary ultrafiltration water; the ultrafiltration membrane assembly includes: primary ultrafiltration membrane and secondary ultrafiltration membrane; wherein, the primary ultrafiltration water is generated by the primary ultrafiltration membrane; and the secondary ultrafiltration water is generated by the secondary ultrafiltration membrane.

[0008] Optionally, the primary ultrafiltration membrane is connected to both the clean water tank and the ultrafiltration water tank, and is used to perform primary filtration of the clean water supplied by the clean water tank. The primary ultrafiltration water generated after filtering the clean water is discharged into the ultrafiltration water tank for storage. The secondary ultrafiltration membrane is connected to both the primary ultrafiltration membrane and the ultrafiltration water tank, and is used to perform secondary filtration of the primary concentrate generated after filtering the clean water by the primary ultrafiltration membrane. The secondary ultrafiltration water generated after filtering the primary concentrate is discharged into the ultrafiltration water tank for storage.

[0009] Optionally, the pure water includes: primary nanofiltration water and secondary nanofiltration water; the nanofiltration membrane assembly includes: primary nanofiltration membrane and secondary nanofiltration membrane; wherein, the primary nanofiltration water is generated by the primary nanofiltration membrane; and the secondary nanofiltration water is generated by the secondary nanofiltration membrane.

[0010] Optionally, the primary nanofiltration membrane is connected to the ultrafiltration water tank and the pure water tank, and is used to perform primary filtration of the ultrafiltration water transported by the ultrafiltration water tank. The primary nanofiltration water generated after filtering the ultrafiltration water is discharged into the pure water tank for storage. The secondary nanofiltration membrane is connected to the primary nanofiltration membrane and the pure water tank respectively, and is used to perform secondary filtration of the primary concentrate generated after filtering the ultrafiltration water by the primary nanofiltration membrane. The secondary nanofiltration water generated after filtering the primary concentrate is discharged into the pure water tank for storage.

[0011] Optionally, the pure water may further include: distilled water.

[0012] Optionally, it also includes: a distillation apparatus, which is connected to the secondary ultrafiltration membrane, the secondary nanofiltration membrane and the pure water tank respectively, for distilling the secondary concentrate generated after filtering the primary concentrate by the secondary ultrafiltration membrane and the secondary concentrate generated after filtering the primary concentrate by the secondary nanofiltration membrane, and generating the distilled water which is discharged into the pure water tank for storage.

[0013] Optionally, the distillation apparatus includes: a first chamber for storing a secondary concentrate; a heating pipe disposed within the first chamber, wherein a refrigerant in the heating pipe releases heat to heat the secondary concentrate, causing the water in the secondary concentrate to boil and evaporate to form water vapor; a first throttling device connected to the heating pipe for depressurizing and cooling the refrigerant; a condensing pipe connected to the first throttling device, wherein the refrigerant in the condensing pipe absorbs heat from the water vapor to liquefy the water vapor into distilled water; a compressor connected to both the heating pipe and the condensing pipe, wherein the compressor compresses the refrigerant and circulates the refrigerant within the heating pipe and the condensing pipe; and a second chamber connected to the first chamber, wherein the condensing pipe is disposed within the second chamber, and the second chamber is used to store the distilled water.

[0014] Optionally, the distillation apparatus further includes: a heat balancing device connected to the heating pipe; and a second throttling device connected to the heat balancing device.

[0015] Optionally, it also includes: a mud chamber, which is connected to the sewage sedimentation tank and is used to store the mud formed after the sewage is settled in the sewage sedimentation tank.

[0016] Optionally, the mud chamber is also connected to the first chamber and is used to store impurities formed after the distillation of the secondary concentrate in the distillation unit.

[0017] Optionally, it also includes: a negative pressure device, which is used to control the vacuum level in the first cavity, the second cavity and the mud cavity; the water supply path of the cooling water system flows through the outer wall of the mud cavity, and is used to heat and dry the mud stored in the mud cavity by utilizing the residual heat of the cooling water in the cooling water system.

[0018] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0019] In this invention's zero-sewage-discharge cooling water system with a water replenishment device, the wastewater discharged from the cooling water system is treated to produce pure water, which is then replenished back into the cooling water system for reuse, thereby achieving zero sewage discharge. The wastewater discharged from the cooling water system is filtered through the ultrafiltration membrane module and the nanofiltration membrane module, effectively removing calcium and magnesium ions, metal ions, and chloride ions from the final pure water. This pure water can then be reused in the cooling water system, effectively reducing scaling, clogging, and corrosion problems.

[0020] Furthermore, the clear water generated after sedimentation in the wastewater sedimentation tank overflows into the clear water tank. Discharging the clear water generated in the wastewater sedimentation tank via overflow allows for natural secondary solid-liquid separation under gravity, avoiding pumping disturbances and improving the reliability of continuous system operation.

[0021] Furthermore, the primary ultrafiltration membrane is connected to both the clean water tank and the ultrafiltration water tank, and is used to perform primary filtration of the clean water supplied by the clean water tank. The resulting primary ultrafiltration water is discharged into the ultrafiltration water tank for storage. The secondary ultrafiltration membrane is also connected to both the primary ultrafiltration membrane and the ultrafiltration water tank, and is used to perform secondary filtration of the primary concentrate generated after the primary ultrafiltration membrane filters the clean water. The resulting secondary ultrafiltration water is discharged into the ultrafiltration water tank for storage. The secondary ultrafiltration membrane can further filter the primary concentrate generated by the primary ultrafiltration membrane to produce secondary ultrafiltration water, thereby maximizing the recovery rate of the ultrafiltration membrane module and reducing the amount of concentrate discharged.

[0022] Furthermore, the primary nanofiltration membrane is connected to both the ultrafiltration water tank and the pure water tank, and is used to perform primary filtration of the ultrafiltration water supplied by the ultrafiltration water tank. The primary nanofiltration water generated after filtering the ultrafiltration water is discharged into the pure water tank for storage. The secondary nanofiltration membrane is connected to both the primary nanofiltration membrane and the pure water tank, and is used to perform secondary filtration of the primary concentrate generated after filtering the ultrafiltration water by the primary nanofiltration membrane. The secondary nanofiltration water generated after filtering the primary concentrate is discharged into the pure water tank for storage. The secondary nanofiltration membrane can further filter the primary concentrate generated by the primary nanofiltration membrane to generate the secondary nanofiltration water, thereby maximizing the recovery rate of the nanofiltration membrane module and reducing the discharge of concentrate.

[0023] Furthermore, the system also includes a distillation unit, which is connected to the secondary ultrafiltration membrane, the secondary nanofiltration membrane, and the pure water tank. This distillation unit is used to distill the secondary concentrate obtained after filtering the primary concentrate using the secondary ultrafiltration membrane, and the secondary concentrate obtained after filtering the primary concentrate using the secondary nanofiltration membrane, generating distilled water which is then stored in the pure water tank. The distillation unit can treat the secondary concentrate to convert it into pure water, thereby improving water resource utilization and reducing wastewater discharge, thus enhancing the environmental friendliness and economy of the entire system.

[0024] Furthermore, the distillation apparatus includes: a first chamber for storing a secondary concentrate; a heating pipe disposed within the first chamber, wherein the refrigerant in the heating pipe releases heat to heat the secondary concentrate, causing the water in the secondary concentrate to boil and evaporate to form water vapor; a first throttling device connected to the heating pipe for depressurizing and cooling the refrigerant; a condensing pipe connected to the first throttling device, wherein the refrigerant in the condensing pipe absorbs heat from the water vapor to liquefy the water vapor into distilled water; a compressor connected to both the heating pipe and the condensing pipe, wherein the compressor compresses the refrigerant and circulates the refrigerant within the heating pipe and the condensing pipe; and a second chamber connected to the first chamber, wherein the condensing pipe is disposed within the second chamber for storing the distilled water. The distillation unit uses a waste liquid treatment process based on high-efficiency heat pump technology to treat the secondary concentrate. The distilled water obtained at the end also does not contain calcium and magnesium ions, metal ions, or chloride ions, and can be reused.

[0025] Furthermore, the distillation apparatus also includes: a heat balancing device connected to the heating pipe; and a second throttling device connected to the heat balancing device. The heat balancing device, connected to the heating pipe, removes excess heat from the apparatus, ensuring that heat does not accumulate excessively and maintaining the overall thermal balance. When the heat generated in the apparatus exceeds the required heat, the heat balancing device activates its heat dissipation function, exchanging heat with a cooling medium (such as cooling water or air) to dissipate the excess heat into the environment. The heat balancing device dynamically adjusts the distribution and removal of heat according to the real-time operating status of the apparatus, ensuring efficient and stable operation.

[0026] Furthermore, it also includes: a negative pressure device, which controls the vacuum level in the first cavity, the second cavity, and the mud cavity; the cooling water system flows through the outer wall of the mud cavity, utilizing the waste heat of the cooling water in the cooling water system to heat and dry the mud stored in the mud cavity. The negative pressure device extracts air from the first cavity, the second cavity, and the mud cavity to create a negative pressure environment. Under negative pressure, the water in the secondary concentrate evaporates more easily to form water vapor. Simultaneously, the negative pressure environment also helps the water vapor condense into liquid more efficiently. The negative pressure device can also lower the boiling point of the liquid in the mud cavity, thereby reducing the energy required for heating. Simultaneously, utilizing the waste heat of the cooling water system to heat and dry the mud achieves efficient energy utilization, resulting in significant energy-saving effects and economic benefits. The negative pressure device can precisely control the vacuum level in the first cavity and the second cavity through frequency conversion or valve flow rate adjustment, ensuring stable operation of the entire distillation process. Vacuum level adjustment can adapt to different processing requirements, thereby optimizing the overall performance of the device. By maintaining a negative pressure environment, the negative pressure device not only improves the efficiency of waste liquid treatment, but also reduces energy consumption and lowers treatment costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the zero-sewage cooling water system with a water replenishment device according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the ultrafiltration membrane module in a zero-sewage cooling water system with a water replenishment device according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of a nanofiltration membrane assembly in a zero-sewage cooling water system with a water replenishment device according to an embodiment of the present invention;

[0030] Figure 4This is a schematic diagram of the distillation device in a zero-sewage cooling water system with a water replenishment device according to an embodiment of the present invention. Detailed Implementation

[0031] As described in the background section, the water replenishment process of existing cooling water systems still has many problems. These will be explained in detail below.

[0032] The process of sodium ion exchange to form softened water involves using resin to transfer Ca2+ ions into the water. 2+ Mg 2+ Replaced with Na + While using sodium ion exchange-modified softened water as a supplementary water source for cooling water systems can significantly reduce scaling tendency, it still has three limitations: First, the softening process requires periodic regeneration of the resin with industrial salt (NaCl), generating high-salinity regeneration waste liquid, which increases water salinity and osmotic pressure shock after discharge; second, the backwashing, forward washing, and regeneration steps consume a lot of water and salt, resulting in high operational and management intensity; third, softening only removes hardness ions, leaving the corrosive anions Cl- unremoved. — SO4 2— Lacking the ability to remove chloride ions, the system still faces the risk of corrosion due to chloride ion concentration after long-term operation. Therefore, relying solely on chemical agents or single softening water is insufficient to simultaneously address scale prevention, corrosion prevention, and environmental protection requirements. Furthermore, the water used to produce softened water cannot be directly reused from the wastewater discharged from the cooling water system, preventing the cooling water system from achieving zero wastewater discharge.

[0033] Based on this, the present invention provides a zero-sewage cooling water system with a water replenishment device. The wastewater discharged from the cooling water system is treated to produce pure water, which is then replenished back into the cooling water system for reuse, thereby achieving zero sewage discharge. The wastewater discharged from the cooling water system is filtered through the ultrafiltration membrane module and the nanofiltration membrane module, effectively removing calcium and magnesium ions, metal ions, and chloride ions from the final pure water. This pure water can then be reused in the cooling water system, effectively reducing scaling, clogging, and corrosion problems.

[0034] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0035] Figure 1 This is a schematic diagram of the zero-sewage cooling water system with a water replenishment device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the ultrafiltration membrane module in a zero-sewage cooling water system with a water replenishment device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a nanofiltration membrane assembly in a zero-sewage cooling water system with a water replenishment device according to an embodiment of the present invention; Figure 4This is a schematic diagram of the distillation device in a zero-sewage cooling water system with a water replenishment device according to an embodiment of the present invention.

[0036] Please refer to Figure 1 A zero-sewage cooling water system with a water replenishment device includes: a cooling water system 100; a filter 101 connected to the cooling water system 100 for preliminary filtration of wastewater discharged from the cooling water system 100; a wastewater sedimentation tank 102 connected to the filter 101 for storing the wastewater filtered by the filter 101; a clear water tank 103 connected to the wastewater sedimentation tank 102 for storing clear water generated after the wastewater has settled in the wastewater sedimentation tank 102; and an ultrafiltration membrane assembly 104 connected to the clear water tank 103. The system includes: a clean water tank 103 for filtering the clean water supplied by the clean water tank 103; an ultrafiltration water tank 105, which is connected to the ultrafiltration membrane assembly 104, for storing ultrafiltration water generated after the ultrafiltration membrane assembly 104 filters the clean water; a nanofiltration membrane assembly 106, which is connected to the ultrafiltration water tank 105, for filtering the ultrafiltration water supplied by the ultrafiltration water tank 105; and a pure water tank 107, which is connected to both the nanofiltration membrane assembly 106 and the cooling water system 100, for storing pure water generated after the nanofiltration membrane assembly 106 filters the ultrafiltration water, and the generated pure water is supplied to the cooling water system 100.

[0037] The wastewater discharged from the cooling water system 100 is treated to produce pure water, which is then recycled back into the cooling water system 100, thus achieving zero wastewater discharge from the cooling water system 100. The wastewater discharged from the cooling water system 100 is filtered by the ultrafiltration membrane module 104 and the nanofiltration membrane module 106, effectively removing calcium and magnesium ions, metal ions, and chloride ions from the resulting pure water. This pure water can then be reused in the cooling water system 100, effectively reducing scaling, clogging, and corrosion problems.

[0038] It should be noted that the cooling water system 100 can be classified into direct-flow cooling water systems and circulating cooling water systems according to the water supply method. Direct-flow cooling water systems are the simplest, where the cooling water is only used once by the heat exchanger and then discharged without reuse. They consume a large amount of water and are only suitable for areas with abundant water resources. Circulating cooling water systems can be further divided into open and closed systems. Open systems mainly consist of a water tank, water pump, plate heat exchanger, process equipment, and piping network, with the cooling water in direct contact with the air. Closed systems mainly consist of a water pump, plate heat exchanger, process equipment, piping network, and pressure regulating equipment, with the cooling water circulating within a closed pipeline. Furthermore, circulating cooling water systems can also be classified into wet and dry systems according to the cooling method. Wet systems cool through water evaporation, while dry systems cool indirectly through cooling pipes in contact with the air.

[0039] In this embodiment, the type of cooling water system 100 is not limited, as long as it involves a cooling water system 100 that requires drainage and water replenishment.

[0040] In this embodiment, the filter 101 is equipped with pressure detection on both sides, which can intelligently identify the flow rate (i.e., the state of the filter body). When the filter 101 detects the flow rate, it is intelligently activated to remove larger visible impurities in the sewage, such as tree branches and leaves.

[0041] Please continue to refer to this. Figure 1 In this embodiment, the clear water generated after sedimentation in the sewage sedimentation tank 102 overflows into the clear water tank 103. Discharging the clear water generated in the sewage sedimentation tank 102 by overflow allows for natural secondary solid-liquid separation under gravity, avoiding pumping disturbances and improving the reliability of continuous system operation.

[0042] It should be noted that the ultrafiltration membrane module 104 is a filtration device used to separate tiny particles and microorganisms from liquids. It typically consists of multiple hollow fiber membrane filaments with a microporous structure, the pore size generally between 0.01 and 0.1 micrometers, effectively trapping bacteria, colloids, suspended solids, and other impurities while allowing water and dissolved small molecules to pass through. The outer shell of the ultrafiltration membrane module 104 is typically made of stainless steel or engineering plastic, serving to protect the membrane filaments and provide structural support. During operation, the liquid to be treated enters from one end of the membrane module. Driven by pressure difference or vacuum, water molecules and small solute molecules in the liquid permeate through the membrane filament walls, forming purified permeate, which flows out from the other end. The trapped impurities remain on the membrane surface, forming a concentrate that is periodically discharged from the system.

[0043] In this embodiment, in order to overcome the pressure loss of the ultrafiltration membrane module 104, a booster pump (not shown) needs to be added to the connection between the ultrafiltration membrane module 104 and the clean water tank 103 to ensure that the clean water delivered to the ultrafiltration membrane module 104 has sufficient pressure, so that the ultrafiltration membrane module 104 can filter the clean water.

[0044] Please refer to Figure 2 And continue to combine with references Figure 1 In this embodiment, the ultrafiltration water includes: primary ultrafiltration water and secondary ultrafiltration water; the ultrafiltration membrane assembly 104 includes: primary ultrafiltration membrane 1041 and secondary ultrafiltration membrane 1042; wherein, the primary ultrafiltration water is generated by the primary ultrafiltration membrane 1041; and the secondary ultrafiltration water is generated by the secondary ultrafiltration membrane 1042.

[0045] In this embodiment, the primary ultrafiltration membrane 1041 is connected to both the clean water tank 103 and the ultrafiltration water tank 105, and is used to perform primary filtration of the clean water supplied by the clean water tank 103. The primary ultrafiltration water generated after filtering the clean water is discharged into the ultrafiltration water tank 105 for storage. The secondary ultrafiltration membrane 1042 is connected to both the primary ultrafiltration membrane 1041 and the ultrafiltration water tank 105, and is used to perform secondary filtration of the primary concentrate generated after filtering the clean water by the primary ultrafiltration membrane 1041. The secondary ultrafiltration water generated after filtering the primary concentrate is discharged into the ultrafiltration water tank 105 for storage. The secondary ultrafiltration membrane 1042 can further filter the primary concentrate generated by the primary ultrafiltration membrane 1041 to generate the secondary ultrafiltration water, thereby maximizing the recovery rate of the ultrafiltration membrane module 104 and reducing the discharge of concentrate.

[0046] It should be noted that the nanofiltration membrane module 106 is a pressure-driven membrane separation technology between reverse osmosis and ultrafiltration, mainly used to remove dissolved salts, organic matter, and microorganisms from water. Its membrane pore size is generally between 1 and 10 nanometers, capable of retaining substances with molecular weights between 200 and 1000. The operating pressure of the nanofiltration membrane module 106 is typically 3.5 to 16 bar, hence it is also called "low-pressure reverse osmosis." It has a relatively low removal rate for monovalent anion salt solutions, such as sodium chloride (20% to 80%), but a higher removal rate for polyvalent anion salt solutions, such as magnesium sulfate (90% to 98%).

[0047] In this embodiment, in order to overcome the pressure loss of the nanofiltration membrane module 106, a secondary booster pump needs to be added to the connection between the nanofiltration membrane module 106 and the ultrafiltration water tank 105 to ensure that the ultrafiltration water delivered to the nanofiltration membrane module 106 has sufficient pressure, so that the nanofiltration membrane module 106 can filter the clean water.

[0048] Please refer to Figure 3 And continue to combine with references Figure 1 In this embodiment, the pure water includes: primary nanofiltration water and secondary nanofiltration water; the nanofiltration membrane assembly 106 includes: primary nanofiltration membrane 1061 and secondary nanofiltration membrane 1062; wherein, the primary nanofiltration water is generated by the primary nanofiltration membrane 1061; and the secondary nanofiltration water is generated by the secondary nanofiltration membrane 1062.

[0049] In this embodiment, the primary nanofiltration membrane 1061 is connected to the ultrafiltration water tank 105 and the pure water tank 107, and is used to perform primary filtration of the ultrafiltration water supplied by the ultrafiltration water tank 105. The primary nanofiltration water generated after filtering the ultrafiltration water is discharged into the pure water tank 107 for storage. The secondary nanofiltration membrane 1062 is connected to both the primary nanofiltration membrane 1061 and the pure water tank 107, and is used to perform secondary filtration of the primary concentrate generated after filtering the ultrafiltration water by the primary nanofiltration membrane 1061. The secondary nanofiltration water generated after filtering the primary concentrate is discharged into the pure water tank 107 for storage. The secondary nanofiltration membrane 1062 can further filter the primary concentrate generated by the primary nanofiltration membrane 1061 to generate the secondary nanofiltration water, thereby maximizing the recovery rate of the nanofiltration membrane module 106 and reducing the discharge of concentrate.

[0050] Please refer to Figure 4 And continue to combine with references Figure 1 In this embodiment, the pure water further includes distilled water; the zero-wastewater cooling water system with a water replenishment device also includes a distillation unit 108, which is connected to the secondary ultrafiltration membrane 1042, the secondary nanofiltration membrane 1062, and the pure water tank 107, respectively. It is used to distill the secondary concentrate generated after the secondary ultrafiltration membrane 1042 filters the primary concentrate, and the secondary concentrate generated after the secondary nanofiltration membrane 1062 filters the primary concentrate, and to generate the distilled water which is discharged into the pure water tank 107 for storage. The distillation unit 108 can treat the secondary concentrate to convert it into pure water, thereby improving water resource utilization and reducing wastewater discharge, thus enhancing the environmental friendliness and economy of the entire system.

[0051] Please continue to refer to this. Figure 4The distillation apparatus 108 includes: a first chamber 10811 for storing a secondary concentrate (not shown); a heating pipe 1082 disposed within the first chamber 10811, wherein a refrigerant (not shown) within the heating pipe 1082 releases heat to heat the secondary concentrate, causing the water in the secondary concentrate to boil and evaporate to form water vapor; a first throttling device 1083 connected to the heating pipe 1082 for depressurizing and cooling the refrigerant; and a condensing pipe 1084 connected to the first throttling device 10811. 83 is connected to the condenser pipe 1084, where the refrigerant absorbs heat from the water vapor to liquefy the water vapor into distilled water (not shown); compressor 1085 is connected to the heating pipe 1082 and the condenser pipe 1084 respectively, and is used to compress the refrigerant and transport the refrigerant to circulate in the heating pipe 1082 and the condenser pipe 1084; second cavity 10812 is connected to the first cavity 10811, and the condenser pipe 1084 is disposed in the second cavity 10812, which is used to store the distilled water.

[0052] The compressor 1085 in the distillation unit 108 is the core component of the entire heat conversion process. The compressor 1085 compresses the refrigerant from a low-temperature, low-pressure gas to a high-temperature, high-pressure gas. During this process, the refrigerant absorbs heat from the surrounding environment, causing its temperature and pressure to rise significantly. At this point, the refrigerant carries a large amount of heat, preparing for subsequent heat utilization. The high-temperature, high-pressure refrigerant gas enters the heating pipe 1082. Inside the heating pipe 1082, the refrigerant releases its own heat to heat the secondary concentrate, causing it to evaporate. Water in the secondary concentrate turns into water vapor under the influence of heat, while impurities remain in the waste liquid due to their higher boiling points. This process achieves effective heat transfer from the refrigerant to the secondary concentrate and also completes the initial separation of the secondary concentrate. After releasing heat through the heating pipe 1082, the refrigerant is then depressurized and cooled by the first throttling device 1083. The pressure and temperature of the refrigerant rapidly decrease, changing from a high-temperature, high-pressure gas to a low-temperature, low-pressure liquid. This process is a crucial step in heat conversion. Through the rapid pressure reduction of the first throttling device 1083, the temperature of the refrigerant decreases, creating conditions for the subsequent condensation process. The low-temperature, low-pressure liquid refrigerant enters the condensation pipe 1084. In the condensation pipe 1084, the liquid refrigerant absorbs heat from the surrounding environment, primarily the heat from the water vapor flowing from the first cavity 10811 to the second cavity 10812. After absorbing ambient heat, the refrigerant evaporates back into a gas, while the water vapor, after absorbing heat, condenses into a liquid to form distilled water, which is stored in the second cavity. This process not only achieves the condensation and recovery of water vapor but also completes the recycling of heat through the absorption of ambient heat by the refrigerant's evaporation.

[0053] The entire heat conversion process achieves heat transfer through the efficient operation of a heat pump system, and separates impurities and water in the secondary concentrate through a distillation process. The secondary concentrate is treated using a wastewater treatment process based on high-efficiency heat pump technology, and the final distilled water is also free of calcium and magnesium ions, metal ions, and chloride ions, making it reusable.

[0054] Please continue to refer to this. Figure 4In this embodiment, the distillation apparatus 108 further includes a storage tank 1081, the internal cavity of which is divided into a first cavity 10811 and a second cavity 10812. The first cavity 10811 and the second cavity 10812 are integrated into a single storage tank 1081, enabling efficient space utilization and separating different types of substances for storage to avoid mutual interference. Furthermore, the integrated storage tank 1081 design simplifies the overall structure, reduces the number of parts, lowers manufacturing costs and maintenance difficulty, and improves the overall structure's sealing, stability, and durability.

[0055] In this embodiment, the internal cavity of the storage box 1081 is further divided into connecting cavities 10813. The connecting cavities 10813 communicate with both the first cavity 10811 and the second cavity 10812, and are located above both cavities. The connecting cavities 10813, situated above and communicating with both cavities, primarily function to facilitate fluid communication and distribution between the two cavities. They also balance the pressure within the two cavities, ensuring a smooth flow of the evaporated water vapor and preventing backflow due to pressure differences. Furthermore, the connecting cavities 10813 can act as a buffer zone, improving the overall operating efficiency and reliability of the storage box 1081.

[0056] In this embodiment, the heating pipe 1082 is arranged in a spiral or serpentine pattern; the condensing pipe 1084 is also arranged in a spiral or serpentine pattern. The spiral or serpentine arrangement significantly increases the surface area of ​​the pipes, thereby improving heat transfer efficiency. Simultaneously, the spiral or serpentine arrangement allows for the arrangement of more pipe lengths within a limited space, making the entire device more compact.

[0057] In this embodiment, the first throttling device 1083 employs an electronic expansion valve. The electronic expansion valve can precisely control the refrigerant flow rate, responding quickly to system demands via electronic signals to achieve precise throttling and pressure reduction, thereby optimizing the operating efficiency of the heat pump system. Its high adjustment precision allows it to adapt to dynamic changes under different operating conditions, ensuring efficient system operation under various loads. Furthermore, the electronic expansion valve has a fast response speed, enabling timely adjustment of the refrigerant flow rate, reducing system energy consumption, and improving energy utilization efficiency. This intelligent throttling control method not only enhances system stability and reliability but also reduces operating costs, making it one of the key components for achieving efficient operation of the ultra-efficient heat pump distillation unit 108.

[0058] In this embodiment, the distillation apparatus 108 further includes: a heat balancing device 1086, which is connected to the heating pipe 1082; and a second throttling device 1087, which is connected to the heat balancing device 1086. The heat balancing device 1086 (specifically, the heat balancing pipe 10861 within the heat balancing device 1086) is connected to the heating pipe 1082 to remove excess heat from the apparatus, ensuring that heat does not accumulate excessively and thus maintaining the overall thermal balance of the apparatus. When the heat generated in the apparatus exceeds the required heat, the heat balancing device 1086 will activate its heat dissipation function, exchanging heat with a cooling medium (such as cooling water or air) to dissipate the excess heat into the environment. This process can be achieved by adjusting the flow rate or temperature of the cooling medium, thereby precisely controlling the system's heat output. The heat balancing device 1086 dynamically adjusts the distribution and removal of heat according to the real-time operating status of the apparatus, ensuring that the apparatus can operate efficiently and stably.

[0059] In this embodiment, the second throttling device 1087 is an electronic expansion valve. The specific characteristics and advantages of the electronic expansion valve are as described above and will not be repeated here.

[0060] In this embodiment, the heat balance pipe 10861 is arranged in a spiral or serpentine pattern. The specific advantages of the spiral or serpentine arrangement are as described above and will not be repeated here.

[0061] It should be noted that, in this embodiment, the heating pipe 1082 and the condensing pipe 1084 are respectively disposed within the first cavity 10811 and the second cavity 10812 of the storage box 1081, while the compressor 1085 is installed outside the storage box 1081. This layout requires that the pipe connections must penetrate the side wall of the storage box 1081. To ensure the airtightness and vacuum of the first cavity 10811 and the second cavity 10812, sealing components (such as sealing rings or sealant) are required at the locations where the pipes penetrate the side wall.

[0062] The specific connection method between the pipes, and between the pipes and the compressor 1085, is as follows: the outlet of the compressor 1085 is connected to the inlet of the heating pipe 1082. The outlet of the heating pipe 1082 is divided into two paths, one of which is connected to the inlet of the condensing pipe 1084, and the other is connected to the inlet of the heat balance pipe 10861 in the heat balance device 1086. The outlets of the condensing pipe 1084 and the heat balance pipe 10861 are then reconnected to the inlet of the compressor 1085, thus forming a closed-loop piping system.

[0063] The advantage of this design lies in the fact that by arranging the heating pipe 1082 and the condensing pipe 1084 in two separate cavities, the heat exchange processes at different stages can be effectively isolated, improving the system's thermal efficiency and stability. Simultaneously, placing the compressor 1085 outside the cavities not only facilitates maintenance and repair but also reduces heat accumulation within the cavities, further optimizing system performance. The use of sealing components ensures the airtightness of the entire system, preventing outside air from entering or internal gas leakage, and maintaining the required vacuum level, which is crucial for the system's efficient operation. Through this carefully designed pipe layout and connection method, the entire device can achieve efficient heat circulation and utilization, meeting process requirements while improving energy efficiency.

[0064] Please continue to refer to this. Figure 1 In this embodiment, the zero-discharge cooling water system with a water replenishment device further includes: a mud chamber 109, which is connected to the sewage sedimentation tank 102 and is used to store the mud formed after the sewage is settled in the sewage sedimentation tank 102; the mud chamber 109 is also connected to the first chamber 10811 and is used to store the impurities formed after the distillation of the secondary concentrate by the distillation device 108. The mud in the sewage sedimentation tank 102 and the impurities formed after distillation by the distillation device 108 need to be pumped into the mud chamber 109 using a pump (not shown).

[0065] Please continue to refer to this. Figure 1 In this embodiment, the zero-discharge cooling water system with a water replenishment device further includes: a negative pressure device 110, which is used to control the vacuum level in the first cavity 10811, the second cavity 10812, and the mud cavity 109; the water supply path of the cooling water system 100 flows through the outer wall of the mud cavity 109, and is used to heat and dry the mud stored in the mud cavity 109 by utilizing the residual heat of the cooling water in the cooling water system 100.

[0066] The negative pressure device 110 creates a negative pressure environment by extracting air from the first cavity 1001, the second cavity 1002, and the mud chamber 109. Under this negative pressure, water in the secondary concentrate evaporates more easily, forming water vapor. Simultaneously, the negative pressure environment also facilitates more efficient condensation of the water vapor into liquid. The negative pressure device 110 can also lower the boiling point of the liquid in the mud chamber 109, thereby reducing the energy required for heating. Furthermore, the waste heat from the cooling water system 100 is used to heat and dry the mud, achieving efficient energy utilization and significant energy-saving effects and economic benefits. The negative pressure device 110 can precisely control the vacuum level in the first cavity 10811, the second cavity 10812, and the mud chamber 109 through frequency conversion or valve flow regulation, ensuring stable operation of the entire distillation process. Vacuum level adjustments can be made to adapt to different processing requirements, thereby optimizing the overall performance of the device. By maintaining a negative pressure environment, the negative pressure device 110 not only improves the efficiency of waste liquid treatment but also reduces energy consumption and lowers processing costs.

[0067] In this embodiment, the negative pressure device 110 employs a vacuum pump, specifically a water ring vacuum pump. The water ring vacuum pump utilizes water to form a water ring to achieve the vacuum function. It has a simple structure, stable operation, and is suitable for use in complex working conditions containing dust and water vapor. Furthermore, the water ring vacuum pump has good sealing performance, effectively preventing gas leakage. Simultaneously, the water circulation removes heat, maintaining a stable pump body temperature and extending its service life. In addition, the water ring vacuum pump can also handle gases containing small amounts of liquid to a certain extent, making it highly adaptable and very suitable for processes requiring a negative pressure environment in waste liquid treatment.

[0068] Please continue to refer to this. Figure 1 In this embodiment, the negative pressure device 110 can be connected to the first cavity 10811, and the mud cavity 109 can be connected to the first cavity 10811 or the second cavity 10812 through a pipe. Through one negative pressure device 110, the first cavity 10811, the second cavity 10812 and the mud cavity 109 can share a vacuum degree.

[0069] In this embodiment, the distilled water stored in the second cavity 10812 is pumped (not shown) to the pure water tank 107, and the pure water stored in the pure water tank 107 is pumped to the cooling water system 100.

[0070] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A zero-sewage cooling water system with a water replenishment device, characterized in that, include: Cooling water system; A filter, which is connected to the cooling water system, is used to perform preliminary filtration of the wastewater discharged from the cooling water system; A wastewater sedimentation tank, which is connected to the filter, is used to store the wastewater filtered by the filter; A clear water tank, which is connected to the sewage sedimentation tank, is used to store the clear water generated after the sewage has settled in the sewage sedimentation tank; An ultrafiltration membrane module, which is connected to the clean water tank, is used to filter the clean water supplied by the clean water tank; An ultrafiltration water tank, which is connected to the ultrafiltration membrane module, is used to store ultrafiltration water generated after the ultrafiltration membrane module filters the clean water; A nanofiltration membrane module, which is connected to the ultrafiltration water tank, is used to filter the ultrafiltration water transported by the ultrafiltration water tank; A pure water tank is connected to both the nanofiltration membrane module and the cooling water system. It is used to store the pure water generated after the nanofiltration membrane module filters the ultrafiltration water, and the generated pure water is transported to the cooling water system.

2. The zero-sewage cooling water system with a water replenishment device as described in claim 1, characterized in that, The clear water generated after sedimentation in the sewage sedimentation tank overflows into the clear water tank.

3. The zero-sewage cooling water system with a water replenishment device as described in claim 1, characterized in that, The ultrafiltration water includes: primary ultrafiltration water and secondary ultrafiltration water; the ultrafiltration membrane assembly includes: primary ultrafiltration membrane and secondary ultrafiltration membrane; wherein, the primary ultrafiltration water is generated by the primary ultrafiltration membrane; and the secondary ultrafiltration water is generated by the secondary ultrafiltration membrane.

4. The zero-sewage cooling water system with a water replenishment device as described in claim 3, characterized in that, The primary ultrafiltration membrane is connected to both the clean water tank and the ultrafiltration water tank, and is used to perform primary filtration of the clean water supplied by the clean water tank. The primary ultrafiltration water generated after filtering the clean water is discharged into the ultrafiltration water tank for storage. The secondary ultrafiltration membrane is connected to both the primary ultrafiltration membrane and the ultrafiltration water tank, and is used to perform secondary filtration of the primary concentrate generated after filtering the clean water by the primary ultrafiltration membrane. The secondary ultrafiltration water generated after filtering the primary concentrate is discharged into the ultrafiltration water tank for storage.

5. The zero-sewage cooling water system with a water replenishment device as described in claim 3, characterized in that, The pure water includes: primary nanofiltration water and secondary nanofiltration water; the nanofiltration membrane assembly includes: primary nanofiltration membrane and secondary nanofiltration membrane; wherein, the primary nanofiltration water is generated by the primary nanofiltration membrane; and the secondary nanofiltration water is generated by the secondary nanofiltration membrane.

6. The zero-sewage cooling water system with a water replenishment device as described in claim 5, characterized in that, The primary nanofiltration membrane is connected to the ultrafiltration water tank and the pure water tank, and is used to perform primary filtration of the ultrafiltration water transported by the ultrafiltration water tank. The primary nanofiltration water generated after filtering the ultrafiltration water is discharged into the pure water tank for storage. The secondary nanofiltration membrane is connected to the primary nanofiltration membrane and the pure water tank respectively, and is used to perform secondary filtration of the primary concentrate generated after filtering the ultrafiltration water by the primary nanofiltration membrane. The secondary nanofiltration water generated after filtering the primary concentrate is discharged into the pure water tank for storage.

7. The zero-sewage cooling water system with a water replenishment device as described in claim 5, characterized in that, The pure water also includes: distilled water.

8. The zero-sewage cooling water system with a water replenishment device as described in claim 7, characterized in that, Also includes: A distillation apparatus is connected to the secondary ultrafiltration membrane, the secondary nanofiltration membrane, and the pure water tank, respectively. It is used to distill the secondary concentrate generated after filtering the primary concentrate through the secondary ultrafiltration membrane and the secondary concentrate generated after filtering the primary concentrate through the secondary nanofiltration membrane, and to generate distilled water which is discharged into the pure water tank for storage.

9. The zero-sewage cooling water system with a water replenishment device as described in claim 8, characterized in that, The distillation apparatus includes: a first chamber for storing a secondary concentrate; a heating pipe disposed within the first chamber, wherein refrigerant in the heating pipe releases heat to heat the secondary concentrate, causing the water in the secondary concentrate to boil and evaporate to form water vapor; a first throttling device connected to the heating pipe for depressurizing and cooling the refrigerant; a condensing pipe connected to the first throttling device, wherein the refrigerant in the condensing pipe absorbs heat from the water vapor to liquefy the water vapor into distilled water; a compressor connected to both the heating pipe and the condensing pipe, wherein the compressor compresses the refrigerant and circulates the refrigerant within the heating pipe and the condensing pipe; and a second chamber connected to the first chamber, wherein the condensing pipe is disposed within the second chamber for storing the distilled water.

10. The zero-sewage cooling water system with a water replenishment device as described in claim 9, characterized in that, The distillation apparatus further includes: a heat balancing device connected to the heating pipe; and a second throttling device connected to the heat balancing device.

11. The zero-sewage cooling water system with a water replenishment device as described in claim 9, characterized in that, Also includes: A mud chamber, which is connected to the sewage sedimentation tank, is used to store the mud formed after the sewage has settled in the sewage sedimentation tank.

12. The zero-sewage cooling water system with a water replenishment device as described in claim 11, characterized in that, The mud chamber is also connected to the first chamber and is used to store impurities formed after the distillation of the secondary concentrate in the distillation unit.

13. The zero-sewage cooling water system with a water replenishment device as described in claim 12, characterized in that, It also includes: a negative pressure device, which is used to control the vacuum level in the first cavity, the second cavity and the mud cavity; the water supply path of the cooling water system flows through the outer wall of the mud cavity, and is used to heat and dry the mud stored in the mud cavity by utilizing the residual heat of the cooling water in the cooling water system.

Images