Welcome: Yiwu Weihao Machinery Equipment Company
Yiwu Weihao Machinery Equipment Company professional evaporator manufacturer specializing in energy-efficient multi-effect evaporation technology, we design and produce high-performance Double Effect External Circulation Vacuum Evaporators. This equipment integrates two-stage evaporation with external forced circulation and vacuum concentration, solving the pain points of low energy efficiency, high operating costs, and material degradation in single-effect evaporation processes. It delivers a cost-effective, stable, and high-quality solution for medium-to-large-scale concentration projects across multiple industrial sectors.
Our Double Effect External Circulation Vacuum Evaporator is a high-efficiency concentration system designed for processing heat-sensitive, high-viscosity, and scaling-prone materials. By utilizing two evaporation stages operating at different temperature and pressure levels, the system reuses the secondary steam generated in the first effect as the heating source for the second effect. The external circulation design ensures the material flows through the heating chamber in a forced turbulent state, effectively preventing scaling and deposition on the tube walls. This combination delivers superior energy efficiency, high throughput, and gentle processing—making it the optimal choice for enterprises balancing cost control and product quality.
Feed Preprocessing: The raw liquid (herbal extract, fruit juice, salt water, etc.) is pre-filtered to remove suspended solids and impurities, adjusted to an appropriate temperature and viscosity, and pumped into the first effect evaporator.
First Effect Evaporation: The liquid in the first effect is heated by fresh steam (0.4-0.8 MPa) in the heating tubes. Under vacuum conditions (-0.04 to -0.07 MPa), the solvent evaporates, generating secondary steam. The external circulation pump forces the liquid to flow rapidly through the tubes, preventing scaling.
MVR Vapor Recompression (Optional): The secondary steam from the first effect can be compressed by an MVR (Mechanical Vapor Recompression) system to increase its temperature and pressure, serving as the heating source for the second effect—maximizing energy savings.
Second Effect Evaporation: The pre-concentrated liquid from the first effect enters the second effect, where it is heated by the recycled secondary steam (or fresh steam for start-up). Operating at a lower temperature (-0.07 to -0.095 MPa), the liquid undergoes further concentration. The external circulation ensures uniform heating and prevents crystal deposition.
Condensation & Discharge: The secondary steam from the second effect is condensed into pure water in the condenser. The fully concentrated liquid is continuously discharged to the storage tank, while the condensed water is recycled or discharged up to standard.
Superior Energy Efficiency: By reusing secondary steam, the system reduces fresh steam consumption by 50-60% compared to single-effect evaporators, significantly lowering operating costs for large-scale production.
Anti-Scaling & Stable Operation: The high-velocity external circulation flow creates a turbulent boundary layer on the heating tube walls, effectively preventing crystal and solute deposition. This design minimizes maintenance downtime and ensures long-term stable operation.
Gentle Low-Temperature Processing: Operating under vacuum conditions (45-75°C), the equipment avoids thermal degradation of heat-sensitive materials such as herbal extracts, vitamins, and flavors, preserving the original color, aroma, and nutritional value.
High Throughput & Concentration Ratio: The two-stage evaporation process achieves a higher concentration ratio in a shorter time compared to single-effect units, significantly improving production efficiency.
Hygienic & Safe Construction: All product contact parts are fabricated from 316L food-grade or pharmaceutical-grade stainless steel, fully compliant with FDA, GMP, and ISO 22000 standards. Features include CIP (Clean-in-Place) systems for easy sanitation.
Compact & Space-Saving: The vertical, shell-and-tube design has a smaller footprint compared to multi-effect evaporators with internal circulation, making it suitable for both new plant construction and existing line retrofits.
| Parameter | Specification |
|---|---|
| Feed Capacity | Customizable |
| Evaporation Capacity | 500 – 20,000 L/h (varies by liquid type and concentration) |
| Operating Temperature | 45 – 90°C (Low-Temperature, Gentle Processing) |
| Operating Vacuum | -0.04 ~ -0.095 MPa (Two-stage vacuum control) |
| Heating Steam Pressure | 0.2 – 0.8 MPa (Fresh Steam); Recycled Secondary Steam (Second Effect) |
| Steam Saving | 50-60% vs. Single-Effect Evaporator |
| Material of Construction | SUS304/316L Stainless Steel |
Food & Beverage: Fruit juice concentration (apple, orange, grape), dairy (milk, yogurt base), honey dehydration, tea/coffee extraction, and natural flavor concentration.
Pharmaceutical & Biotechnology: Herbal extract concentration, API (Active Pharmaceutical Ingredient) purification, and bio-active ingredient recovery.
Chemical Industry: Organic solvent recovery, heat-sensitive chemical concentration, and salt water desalination.
Environmental Engineering: High-salinity wastewater concentration and zero-liquid-discharge (ZLD) systems for specific industrial waste streams.
We provide end-to-end, turnkey solutions for your Double Effect External Circulation Vacuum Evaporator requirements:
Process Engineering & Design: Detailed feasibility studies and customized system design based on your specific liquid properties, target concentration, production capacity, and site constraints.
Precision Manufacturing: Strict quality control for the heating chambers, circulation pumps, and vacuum systems to ensure long-term reliability and performance.
Global Installation & Commissioning: Professional on-site teams for seamless integration into your production line, including start-up, performance testing, and operator training.
Lifelong Technical Support: Comprehensive after-sales service, including spare parts supply, troubleshooting, and remote monitoring to minimize downtime and maximize your equipment's lifespan.
Contact Us Today for a free technical consultation, process simulation, and a customized quotation tailored to your exact concentration needs.
