A skid-mounted integrated evaporation reaction device
The skid-mounted integrated evaporation reactor, with its closed-loop heat transfer oil heating and modular integrated design, solves the problems of limited evaporation temperature and large heat loss in traditional electroplating wastewater treatment. It achieves efficient reduction and harmless treatment of hazardous waste, and reduces operation and maintenance costs and carbon emissions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG HI TECH ENVIRONMENTAL TECH
- Filing Date
- 2025-04-28
- Publication Date
- 2026-08-04
AI Technical Summary
In existing electroplating wastewater treatment technologies, traditional evaporators suffer from problems such as limited evaporation temperature, large heat loss, dispersed equipment, high maintenance costs, and low solid-liquid separation efficiency, making it difficult to achieve efficient and stable hazardous waste reduction and harmless treatment.
By employing closed-loop heating technology with heat transfer oil and radial rotation of the drum, combined with modular integrated design, a skid-mounted integrated evaporation reactor is constructed to achieve precise control of evaporation temperature and solid-liquid separation. It integrates the entire closed-loop process of evaporation-concentration-drying and adopts a self-cleaning wall scraping structure and anti-crystallization flow channel design.
It improved system thermal efficiency, reduced operation and maintenance costs, extended continuous operation cycle, achieved the reduction and harmless treatment of hazardous waste, and reduced infrastructure costs and carbon emissions.
Smart Images
Figure CN224590726U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an integrated evaporation reaction device, and more specifically, a skid-mounted integrated evaporation reaction device. Background Technology
[0002] High-concentration electroplating wastewater originates from the accumulation of impurities or the decay of effective components in the plating bath due to long-term circulation during electroplating, passivation, and stripping processes. Its concentrations of heavy metals, COD, and ammonia nitrogen can reach 5-8 times that of conventional electroplating wastewater. It also contains highly stable complexing agents, coordination agents, and other organic pollutants. Due to the complex forms of these pollutants and low solid-liquid conversion efficiency, it has become a key bottleneck in zero-discharge processes for electroplating wastewater. Traditional treatment technologies rely on chemical methods that depend on multi-stage precipitation-oxidation-reduction reactions, but the decomposition efficiency of complexed heavy metals is less than 40%, requiring reagent dosages 2-3 times higher than theoretical values, and generating sludge containing heavy metals accounting for 15%-20% of the treated water volume. Physical methods, while achieving concentration through reverse osmosis or adsorption, suffer from rapid membrane fouling and high adsorbent regeneration costs. While evaporation processes can avoid the addition of chemical reagents, existing equipment has significant drawbacks: MVR evaporation crystallization systems use mechanical vapor compression technology to reduce energy consumption, but their evaporation temperature is limited by saturated vapor pressure, causing a sharp drop in heat transfer efficiency of 40%-50% for high-viscosity materials. Furthermore, the axial flow pump impeller requires replacement more than three times per year due to salt crystallization corrosion. Multi-effect scraper evaporators enhance wall heat transfer through rotating scrapers, but the insufficient precision of the gap between the scraper and the cylinder makes it prone to carbonization and coking under high solid content conditions, resulting in a discharge moisture content fluctuation range of ±8%, which cannot meet the requirements for solid hazardous waste stabilization. More importantly, existing evaporation systems mostly adopt a split design, with heating furnaces, circulating pumps, and other units dispersed, resulting in heat loss exceeding 15%. Crystallization blockages frequently occur at pipe bends, and maintenance costs account for more than 35% of total operating costs.
[0003] To address the aforementioned technical challenges, this invention develops a skid-mounted integrated evaporation reactor, overcoming the limitations of traditional evaporators in terms of temperature control accuracy and system integration. This device employs closed-loop circulating heating technology with heat transfer oil to achieve precise temperature control during evaporation. Combined with the radial rotation of the drum, wastewater gradually evaporates on the drum surface, achieving complete separation of solids and water vapor. Modular integration constructs a closed-loop process of "evaporation-concentration-drying." Compared to traditional split-type equipment, the system boasts improved thermal efficiency, eliminates steam usage, achieves higher heat transfer oil temperatures, and utilizes a self-cleaning scraping structure and anti-crystallization flow channel design, extending continuous operation cycles. Through synergistic innovation in process and structure, this device reduces hazardous waste volume and harmlessness while minimizing floor space and lowering maintenance costs, providing highly reliable equipment support for zero emissions in the electroplating industry. Summary of the Invention
[0004] To solve the above-mentioned technical problems, this utility model provides a skid-mounted integrated evaporation reactor, which adopts the following technical solution:
[0005] A skid-mounted integrated evaporation reactor, characterized in that it comprises: a drum dryer, an intermediate stirring and circulating tank, a water inlet pump, a transmission motor, an integrated hoisting platform, a heating oil furnace, and an expansion oil tank; the drum dryer is equipped with a spray pipe, and the intermediate stirring and circulating tank is connected to the spray pipe on the drum dryer through a water inlet pipe; the water inlet pipe is equipped with a water inlet pump, which transports wastewater from the intermediate stirring and circulating tank to the spray pipe of the drum dryer; the heating oil furnace is connected to the drum dryer through a heat transfer oil circulation pipe.
[0006] Furthermore, the integrated hoisting and installation platform integrates a fixed drum dryer, an intermediate mixing and circulating tank, a water inlet pump, a transmission machine, a heating oil furnace, and an expansion oil tank. The integrated hoisting and installation platform is equipped with hoisting rings on both sides to enable rapid transfer of the entire device.
[0007] Furthermore, the drum dryer includes a central vacuum drying cylinder and an air collection port, the air collection port being located at the top of the drum dryer; a spray pipe is provided on the outer surface of the central vacuum drying cylinder; and a discharge scraper is provided inside the drum dryer.
[0008] Furthermore, the central vacuum drying cylinder is a sealed cavity, including an inner wall panel and an outer wall panel, which are respectively welded to the two ends of the inner roller and the outer roller; the central vacuum drying cylinder has a central shaft at its center, which passes through the inner wall panel and the outer wall panel, and is welded and sealed by a hot drying process.
[0009] Furthermore, the central shaft is provided with a through hole, a driven sprocket is provided on one side of the central shaft, and a driving sprocket is provided on the transmission mechanism. The driving sprocket drives the driven sprocket to rotate through a chain.
[0010] Furthermore, the heat transfer oil circulation pipeline includes an oil inlet pipeline and an oil outlet pipeline; the central vacuum drying cylinder is provided with a central vacuum drying cylinder oil inlet and a central vacuum drying cylinder oil outlet; the heating oil furnace is provided with a heating oil furnace oil inlet and a heating oil furnace oil outlet; the oil inlet pipeline connects the heating oil furnace oil outlet and the central vacuum drying cylinder oil inlet; and the oil outlet pipeline connects the central vacuum drying cylinder oil outlet and the heating oil furnace oil inlet.
[0011] Furthermore, the expansion tank is installed above the heating oil furnace, with its bottom 50-100mm higher than the highest point of the central vacuum drying cylinder, and an oil filling port is provided at the top.
[0012] Compared with existing technologies, the advantages of this utility model are:
[0013] (1) The drying system, feeding device and heat source equipment are integrated into a three-in-one architecture to realize the modular hoisting and deployment of the whole machine, which significantly reduces the infrastructure cost and construction period.
[0014] (2) The innovative use of a high-temperature heat transfer oil circulation system reduces the final moisture content of the material and increases the drying rate compared with traditional low-temperature steam drying, thus achieving synergistic optimization of energy utilization and processing efficiency.
[0015] (3) The system is equipped with a quick-release pipeline network and a visual inspection channel. The unique self-cleaning flow guiding structure improves the efficiency of crystal removal and shortens maintenance time.
[0016] (4) Based on the three-dimensional heat transfer topology design of vacuum drying cylinder, the heat transfer oil volume is reduced while maintaining the same heat exchange area, the energy consumption of the supporting power system is reduced, and the annual operating cost is reduced.
[0017] (5) Skid-mounted equipment can be quickly transferred to the next water plant for wastewater treatment, improving equipment efficiency and reducing investment.
[0018] (6) The whole process of electric drive achieves zero reagent addition, and the carbon emissions per ton of wastewater treated are reduced compared with traditional methods. Attached Figure Description
[0019] Figure 1 This is a front view of the structure of this utility model;
[0020] Figure 2 This is a top view of the present invention;
[0021] Figure 3 This is a side view of a tumble dryer;
[0022] Figure 4 A cross-sectional view of the central vacuum drying cylinder.
[0023] The components are as follows: 1-Drum dryer, 2-Intermediate mixing and circulating tank, 3-Inlet pump, 4-Transmission machine, 5-Integrated hoisting and installation platform, 6-Heating oil furnace, 7-Expansion oil tank, 8-Spray pipe, 9-Inlet water pipe, 10-Hanging ring, 11-Central vacuum drying cylinder, 12-Gas collection port, 13-Discharge scraper, 14-Inner wall panel, 15-Outer wall panel, 16-Inner roller, 17-Outer roller, 18-Central shaft, 19-Through hole, 20-Driven sprocket, 21-Drive sprocket, 22-Chain, 23-Inlet oil pipe, 24-Outlet oil pipe, 25-Central vacuum drying cylinder inlet, 26-Central vacuum drying cylinder outlet, 27-Heating oil furnace inlet, 28-Heating oil furnace outlet, 29-Oil injection port. Detailed Implementation
[0024] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments.
[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, this utility model provides a skid-mounted integrated evaporation reactor, characterized in that it includes: a drum dryer 1, an intermediate stirring and circulating tank 2, a water inlet pump 3, a transmission motor 4, an integrated hoisting and installation platform 5, a heating oil furnace 6, and an expansion oil tank 7; the drum dryer 1 is equipped with a spray pipe 8, and the intermediate stirring and circulating tank 2 is connected to the spray pipe 8 on the drum dryer 1 through a water inlet pipe 9; the water inlet pipe 9 is equipped with a water inlet pump 3, which transports the wastewater in the intermediate stirring and circulating tank 2 to the spray pipe 8 of the drum dryer 1; the heating oil furnace 6 is connected to the drum dryer 1 through a heat transfer oil circulation pipe.
[0026] The integrated hoisting and installation platform 5 integrates a fixed drum dryer 1, an intermediate mixing and circulating tank 2, a water inlet pump 3, a transmission machine 4, a heating oil furnace 6, and an expansion oil tank 7. The integrated hoisting and installation platform 5 is equipped with hoisting rings 10 on both sides to realize the rapid transfer of the entire device.
[0027] The drum dryer 1 includes a central vacuum drying cylinder 11 and an air collection port 12, the air collection port 12 being located at the top of the drum dryer 1; a spray pipe 8 is provided on the outer surface of the central vacuum drying cylinder 11; and a discharge scraper 13 is provided inside the drum dryer 1.
[0028] The central vacuum drying cylinder 11 is a sealed cavity, including an inner wall panel 14 and an outer wall panel 15, which are respectively welded to the two ends of the inner roller 16 and the outer roller 17; the central vacuum drying cylinder 11 has a central shaft 18 at its center, which passes through the inner wall panel 14 and the outer wall panel 15, and is sealed by welding through a hot drying process.
[0029] The central shaft 18 is provided with a through hole 19, and a driven sprocket 20 is provided on one side of the central shaft 18. The transmission 4 is provided with a driving sprocket 21, and the driving sprocket 21 drives the driven sprocket 20 to rotate through the chain 22.
[0030] The heat transfer oil circulation pipeline includes an oil inlet pipe 23 and an oil outlet pipe 24. The central vacuum drying cylinder 11 is provided with a central vacuum drying cylinder oil inlet 25 and a central vacuum drying cylinder oil outlet 26. The heating oil furnace 6 is provided with a heating oil furnace oil inlet 27 and a heating oil furnace oil outlet 28. The oil inlet pipe 23 connects the heating oil furnace oil outlet 28 and the central vacuum drying cylinder oil inlet 25. The oil outlet pipe 24 connects the central vacuum drying cylinder oil outlet 26 and the heating oil furnace oil inlet 27.
[0031] The expansion oil tank 7 is installed above the heating oil furnace 6, with its bottom 50-100mm higher than the highest point of the central vacuum drying cylinder 11, and an oil filling port 29 is provided at the top.
[0032] The system's processing flow is as follows:
[0033] Electroplating wastewater is stored in the intermediate stirring and circulating tank 2. It is then pumped by the inlet pump 3 through the inlet pipe 9 to the spray pipe 8 inside the drum dryer 1, where it is atomized and evenly sprayed onto the outer surface of the central vacuum drying cylinder 11. The central vacuum drying cylinder 11 rotates radially and has an internal sandwich structure consisting of an inner roller 16 and an outer roller 17. The oil inlets 25 and outlets 26 at both ends of the central shaft 18 are connected to the oil inlet and outlet pipes via through holes 19. High-temperature heat transfer oil is injected from the central vacuum drying cylinder inlet 25 through the oil inlet pipe 23. After circulating through the central vacuum drying cylinder 11, it returns from the central vacuum drying cylinder outlet 26 through the oil outlet pipe 24 to the heating oil furnace inlet 27. After being heated by the heating oil furnace 6, it flows out from the heating oil furnace outlet 28 back to the oil inlet pipe 23. The expansion tank 7 is placed on top of the heating oil furnace 6, with its lowest point 50° above the highest point of the central vacuum drying cylinder 11. A 100mm diameter closed-loop temperature control system is formed. The transmission system drives the active sprocket 21 and chain 22 through the transmission machine 4, which in turn drives the driven sprocket 20. The driven sprocket 20 is installed on one side of the central shaft 18. The radial rotation of the central shaft 18 is linked to the continuous rotation of the central vacuum drying cylinder 11. The evaporated water vapor is collected and processed by the gas collection port 12. The dried solids are collected after being peeled off by the unloading scraper 13. The spray pipe 8 is connected to natural water through a three-way valve to achieve online cleaning. The entire set of equipment is integrated into the integrated hoisting and installation platform 5. Modular transportation is achieved through the hoisting ring 10. The central shaft 18, inner wall panel 14, outer wall panel 15, inner roller 16, and outer roller 17 form an inner and outer sealed cavity. The inner cavity is vacuumed under negative pressure to reduce heat loss. The outer cavity forms a sandwich structure to transport high-temperature heat transfer oil in circulation, ensuring efficient utilization of heat energy and safe operation. Finally, the solid-vapor separation of wastewater and the harmless treatment of hazardous waste are completed.
[0034] This invention employs closed-loop circulating heating technology with heat transfer oil to achieve precise control of evaporation temperature. Combined with the radial rotation of the drum, wastewater gradually evaporates moisture on the drum surface, achieving complete separation of solids and water vapor. A modular integration constructs a closed-loop process of "evaporation-concentration-drying." Compared to traditional split-type equipment, the system boasts improved thermal efficiency, operates on pure electricity without steam, achieves higher heating temperatures for the heat transfer oil, and utilizes a self-cleaning wall scraping structure and anti-crystallization flow channel design, extending the continuous operation cycle. Through synergistic innovation in process and structure, this device reduces the volume and harmlessness of hazardous waste while minimizing floor space and lowering operation and maintenance costs, providing highly reliable equipment support for zero emissions in the electroplating industry. Example
[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.
[0036] A skid-mounted integrated evaporation reactor was prototyped using the above technical solution, such as... Figure 1 As shown, the object of treatment is high-concentration electroplating wastewater with a water content of 70%-80%.
[0037] The device includes a drum dryer 1, an intermediate mixing and circulating tank 2, a water inlet pump 3, a transmission machine 4, an integrated hoisting and installation platform 5, a heating oil furnace 6, an expansion oil tank 7, a spray pipe 8, a water inlet pipe 9, a hoisting ring 10, a central vacuum drying cylinder 11, an air collection port 12, a discharge scraper 13, an inner wall panel 14, an outer wall panel 15, an inner roller 16, an outer roller 17, a central shaft 18, a through hole 19, a driven sprocket 20, a driving sprocket 21, a chain 22, an oil inlet pipe 23, an oil outlet pipe 24, an oil inlet 25, an oil outlet 26, an oil inlet 27, an oil outlet 28, and an oil injection port 29.
[0038] The device includes: a drum dryer 1, an intermediate mixing and circulating tank 2, a water inlet pump 3, a transmission machine 4, an integrated hoisting and installation platform 5, a heating oil furnace 6, and an expansion oil tank 7; the drum dryer 1 is equipped with a spray pipe 8, and the intermediate mixing and circulating tank 2 is connected to the spray pipe 8 on the drum dryer 1 through a water inlet pipe 9; the water inlet pipe 9 is equipped with a water inlet pump 3, which transports the wastewater in the intermediate mixing and circulating tank 2 to the spray pipe 8 of the drum dryer 1; the heating oil furnace 6 is connected to the drum dryer 1 through a heat transfer oil circulation pipe.
[0039] The integrated hoisting and installation platform 5 integrates a fixed drum dryer 1, an intermediate mixing and circulating tank 2, a water inlet pump 3, a transmission machine 4, a heating oil furnace 6, and an expansion oil tank 7. The integrated hoisting and installation platform 5 is equipped with hoisting rings 10 on both sides to realize the rapid transfer of the entire device.
[0040] The drum dryer 1 includes a central vacuum drying cylinder 11 and an air collection port 12, the air collection port 12 being located at the top of the drum dryer 1; a spray pipe 8 is provided on the outer surface of the central vacuum drying cylinder 11; and a discharge scraper 13 is provided inside the drum dryer 1.
[0041] The central vacuum drying cylinder 11 is a sealed cavity, including an inner wall panel 14 and an outer wall panel 15, which are respectively welded to the two ends of the inner roller 16 and the outer roller 17; the central vacuum drying cylinder 11 has a central shaft 18 at its center, which passes through the inner wall panel 14 and the outer wall panel 15, and is sealed by welding through a hot drying process.
[0042] The central shaft 18 is provided with a through hole 19, and a driven sprocket 20 is provided on one side of the central shaft 18. The transmission 4 is provided with a driving sprocket 21, and the driving sprocket 21 drives the driven sprocket 20 to rotate through the chain 22.
[0043] The heat transfer oil circulation pipeline includes an oil inlet pipe 23 and an oil outlet pipe 24. The central vacuum drying cylinder 11 is provided with a central vacuum drying cylinder oil inlet 25 and a central vacuum drying cylinder oil outlet 26. The heating oil furnace 6 is provided with a heating oil furnace oil inlet 27 and a heating oil furnace oil outlet 28. The oil inlet pipe 23 connects the heating oil furnace oil outlet 28 and the central vacuum drying cylinder oil inlet 25. The oil outlet pipe 24 connects the central vacuum drying cylinder oil outlet 26 and the heating oil furnace oil inlet 27.
[0044] The expansion oil tank 7 is installed above the heating oil furnace 6, with its bottom 50-100mm higher than the highest point of the central vacuum drying cylinder 11, and an oil filling port 29 is provided at the top.
[0045] A plating wastewater treatment plant had 30 m³ of high-concentration plating wastewater stored in its system. This wastewater was characterized by high COD, high total nitrogen, and high oil content, with a water content of 70-80%, and was classified as hazardous waste. The high-concentration wastewater was evaporated and dried using this 1.5 m³ / D treatment unit, resulting in sludge with a moisture content of 5-15%, which was then collected in ton bags and transported off-site for disposal. The water vapor generated after evaporation and drying was condensed and then reintroduced into the plant's exhaust gas treatment system for compliant emissions. This unit effectively separated solids and gases in the wastewater, significantly reducing its volume and achieving harmless treatment. During operation, the drum speed was 0.5-1 m / min, the temperature was controlled at 180-200℃, and the unit operated for 20 hours daily. After one month of continuous operation, the high-concentration plating wastewater from the treatment plant was completely evaporated and dried. The evaporator was then transferred to another wastewater treatment plant for further processing. Compared to traditional steam evaporation units, drum evaporators require no steam source, instead using heat transfer oil for rapid heating. The required operating temperature of the heat transfer oil (180-200℃) is significantly higher than the 100-120℃ required for steam. The discharged material, with a moisture content of 5-15%, is prepared as a solid sludge cake, allowing for transport in bulk bags with zero leakage of hazardous waste. The moisture content of the sludge cake from a drum evaporator is much lower than that from a steam evaporator, and the inherent characteristics of high-concentration wastewater mean that steam evaporation cannot produce a solid output.
[0046] The above-described embodiments are merely illustrative of one implementation of this utility model and are not intended to limit it. It should be noted that those skilled in the art can modify the technical solutions described in the above embodiments or make equivalent substitutions for some or all of the technical features; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the protection scope of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.
Claims
1. A skid-mounted integrated evaporation reactor characterized by, include: The equipment includes a rotary drum dryer, an intermediate mixing and circulating tank, a water inlet pump, a transmission motor, an integrated hoisting platform, a heating oil furnace, and an expansion oil tank. The rotary drum dryer is equipped with spray pipes, and the intermediate mixing and circulating tank is connected to the spray pipes on the rotary drum dryer via a water inlet pipe. A water inlet pump is installed on the water inlet pipe, which transports wastewater from the intermediate mixing and circulating tank to the spray pipes of the rotary drum dryer. The heating oil furnace is connected to the rotary drum dryer via a heat transfer oil circulation pipe.
2. A skid-mounted integrated evaporation reactor according to claim 1, characterized in that The integrated hoisting and installation platform integrates a fixed drum dryer, an intermediate mixing and circulating tank, a water inlet pump, a transmission machine, a heating oil furnace, and an expansion oil tank. The integrated hoisting and installation platform is equipped with hoisting rings on both sides to enable rapid transfer of the entire device.
3. A skid-mounted integrated evaporation reactor according to claim 1, characterized in that, The drum dryer includes a central vacuum drying cylinder and an air collection port, the air collection port being located at the top of the drum dryer; a spray pipe is provided on the outer surface of the central vacuum drying cylinder; and a discharge scraper is provided inside the drum dryer.
4. A skid-mounted integrated evaporation reactor according to claim 3, characterized in that The central vacuum drying cylinder is a sealed cavity, including an inner wall panel and an outer wall panel, which are respectively welded to the two ends of the inner roller and the outer roller; the central vacuum drying cylinder has a central shaft at its center, which passes through the inner wall panel and the outer wall panel, and is welded and sealed by a hot drying process.
5. A skid-integrated evaporation reactor according to claim 4, wherein The central shaft has a through hole, and a driven sprocket is provided on one side of the central shaft. The transmission machine is provided with a driving sprocket, and the driving sprocket drives the driven sprocket to rotate through a chain.
6. A skid-mounted integrated evaporation reactor according to claim 3, characterized in that, The heat transfer oil circulation pipeline includes an oil inlet pipeline and an oil outlet pipeline. The central vacuum drying cylinder is provided with a central vacuum drying cylinder oil inlet and a central vacuum drying cylinder oil outlet. The heating oil furnace is provided with a heating oil furnace oil inlet and a heating oil furnace oil outlet. The oil inlet pipeline connects the heating oil furnace oil outlet and the central vacuum drying cylinder oil inlet, and the oil outlet pipeline connects the central vacuum drying cylinder oil outlet and the heating oil furnace oil inlet.
7. The skid-integrated evaporation reactor of claim 1, wherein The expansion tank is installed above the heating oil furnace, with its bottom 50-100mm higher than the highest point of the central vacuum drying cylinder, and an oil filling port is provided at the top.