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Help CenterForced Circulation Vacuum Multi-Effect Evaporator for Seawater Desalination and Salt Recovery
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Qingdao Conqinphi Environmental Technology Group Co., Ltd., established in 2015, is a professional manufacturer specializing in advanced evaporation and crystallization systems. With a factory size of 10,000–30,000 square meters and over 200 skilled employees, we have supplied forced circulation vacuum multi-effect evaporators to clients across North America, South America, Europe, Africa, the Middle East, and Asia. Our seawater desalination and salt recovery evaporator combines forced circulation technology with multi-effect vacuum design to achieve high thermal efficiency, low energy consumption, and reliable operation for demanding applications.
This evaporator is engineered to handle high-salinity feed water, such as seawater and industrial brine, producing fresh water while simultaneously recovering valuable salt crystals. The forced circulation design prevents scaling and fouling, ensuring long-term stable performance. The multi-effect vacuum configuration maximizes energy reuse, significantly reducing operating costs compared to traditional single-effect evaporators.
Key Features & Benefits
- Forced Circulation Design – High flow velocity inside tubes minimizes scaling and fouling, ideal for high-salinity and scaling-prone feed water.
- Multi-Effect Vacuum Operation – Each effect operates at a lower pressure, allowing vapor from one effect to heat the next, reducing steam consumption by up to 70%.
- High Fresh Water Recovery – Achieves up to 50–60% water recovery from seawater, with optional brine concentration for zero liquid discharge (ZLD) systems.
- Salt Crystallization Capability – Integrated crystallizer or salt separator for recovering high-purity sodium chloride or other salts.
- Corrosion-Resistant Materials – Constructed from stainless steel 316L or duplex stainless steel for long service life in corrosive environments.
- Automated Control – PLC and HMI provide real-time monitoring, automatic start/stop, and alarm functions, requiring minimal operator intervention.
- Energy-Efficient – Low specific energy consumption (typically 20–40 kWh/m³ of fresh water produced) thanks to vapor compression and heat recovery.
- Customizable Capacity – Available in capacities from 10 m³/day to over 500 m³/day, tailored to your project requirements.
Technical Specifications (Typical)
| Parameter | Value |
|---|---|
| Feed Water TDS | Up to 100,000 ppm (seawater / brine) |
| Fresh Water Quality | TDS |
| Recovered Salt Purity | ≥ 98% NaCl (optional further purification) |
| Steam Consumption | 0.15 – 0.3 kg steam per kg fresh water (depending on effects) |
| Power Consumption | 20 – 40 kWh/m³ fresh water |
| Operating Temperature | 60 – 120 °C per effect |
| Vacuum Level | -0.08 to -0.095 MPa |
| Number of Effects | 3 – 7 (customizable) |
| Material of Construction | SS316L / Duplex SS / Titanium (optional) |
| Control System | PLC + HMI (Siemens, Schneider, or equivalent) |
The forced circulation vacuum multi-effect evaporator is particularly effective for seawater desalination where fresh water is scarce, and for salt recovery in brine treatment plants, chlor-alkali industries, or salt production facilities. By combining desalination and salt recovery in one system, it reduces the overall footprint and operational complexity.
Why Choose Qingdao Conqinphi?
- Manufacturing Excellence – Our 10,000–30,000 m² factory houses advanced fabrication equipment, including CNC machining, welding robots, and pressure vessel testing facilities.
- Global Track Record – With annual export value of US$10–50 million, we have supplied evaporators to clients in over 20 countries, including North America, Europe, Middle East, and Southeast Asia.
- Quality Assurance – Our production processes are certified under ISO9001, ISO14001, and OHSAS18001. We also maintain HACCP, SA8000, and other management system certifications.
- Experienced Team – 201–300 employees, including 30+ R&D engineers, provide customized solutions and after-sales support.
- Flexible Shipping – Port of shipment: Qingdao, China. We coordinate worldwide logistics to ensure timely delivery.
Ready to optimize your seawater desalination and salt recovery process? Contact us today for a detailed quotation and technical proposal. Our team will work with you to design a system that meets your specific feed water composition, capacity, and salt purity requirements. With our proven technology and reliable manufacturing, you can achieve high water recovery and valuable salt production with minimal environmental impact.
Frequently Asked Questions (FAQ)
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Q: What is the maximum feed water TDS that this evaporator can handle?
A: The system can handle feed water with TDS up to 100,000 ppm, including seawater and concentrated brine. For higher TDS, we can customize with special materials and design. -
Q: How much fresh water can I recover from seawater?
A: Typically 50–60% of the feed water can be recovered as distillate. The remaining concentrated brine can be further processed for salt recovery or disposed of. -
Q: What is the purity of the recovered salt?
A: Under standard operating conditions, the salt purity is ≥ 98% NaCl. If higher purity is required, additional washing or recrystallization steps can be integrated. -
Q: What is the typical energy consumption?
A: Steam consumption ranges from 0.15 to 0.3 kg steam per kg of fresh water, depending on the number of effects. Electrical power consumption is 20–40 kWh per cubic meter of fresh water. -
Q: Can the system be fully automated?
A: Yes, we provide PLC and HMI control with options for remote monitoring, automatic start/stop, and alarm notifications. Manual operation is also possible. -
Q: What materials are used for construction?
A: Standard material is SS316L. For highly corrosive brines, we offer duplex stainless steel or titanium. The choice depends on feed water chemistry and temperature. -
Q: How long does it take to install and commission?
A: Installation time varies by system size, typically 2–4 weeks. Our engineers provide on-site supervision and training. Commissioning usually takes 1–2 weeks. -
Q: What is the warranty period?
A: We offer a standard 12-month warranty covering manufacturing defects. Extended warranty options are available upon request.
Contact us for more information or to discuss your project. We are committed to providing durable, efficient, and cost-effective evaporation solutions for seawater desalination and salt recovery.
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