China Thermal Evaporation Systems Factories & Suppliers

To size an industrial thermal evaporator and vapor compressor accurately, our engineering office requires:

• Complete Ionic Balance: Ca²⁺, Mg²⁺, Na⁺, K⁺, SO₄²⁻, Cl⁻, HCO₃⁻, CO₃²⁻, and NO₃⁻ concentrations to calculate boiling point elevation (BPE) and scaling risks.
• Secondary Scaling Agents: Total silica (reactive and colloidal), barium, strontium, and fluoride levels.
• Organic Contaminants: COD, BOD, TOC, and volatile organic compounds (VOCs) that can carry over into the distillate or cause foaming in the evaporator chest.
• Physical Properties: Operating pH, suspended solids (TSS), feed temperature range, and daily throughput requirements (m³/day or metric tons/hour).

Tongjie combats scaling through a four-tier engineering approach:

1. Pre-treatment Hardness Stripping: Lowering calcium, magnesium, and silica via chemical softening ahead of the thermal stage.
2. High Wetting Density Distribution: Using custom CNC-machined liquid distribution trays that ensure every tube internal surface remains continuously wetted, preventing localized dry spots where scaling concentrates.
3. Forced Circulation Transition: Once brine concentration nears saturation limits, the fluid is routed out of the falling film unit into a forced circulation crystallizer where vaporization occurs outside the heat exchanger bundle in an expansion flash chamber.
4. Automated CIP Integration: Integrated Clean-in-Place systems automatically cycle mild acid or anti-scalant washes when heat transfer efficiency drops below predefined thresholds.

MVR is the preferred choice when low-cost electrical power is accessible and steam is scarce or expensive. An MVR system recycles latent heat by recompressing secondary vapor, consuming only 18 to 35 kWh per metric ton of evaporated water without needing external boiler steam during steady-state operation. MED is favored only when low-cost or waste industrial steam (below 2.5 bar) is abundant on site.

High chloride concentrations at temperatures between 70°C and 105°C rapidly cause stress corrosion cracking and pitting in conventional 304 and 316L stainless steels. For brine concentrations above 35,000 ppm Cl⁻, Tongjie utilizes Grade 2 and Grade 12 Titanium for heat transfer tubes, 2205 or 2507 Super Duplex Stainless Steel for vapor chambers, and Hastelloy C-276 for high-temperature crystallizer pumps and mother liquor recirculation lines.

Directly feeding raw wastewater at 20,000 mg/L TDS into a thermal evaporator requires huge heating surfaces and large vapor compressors. By utilizing Disc Tube RO (DTRO) or Osmosis-Assisted Reverse Osmosis (OARO) to concentrate the brine up to 120,000 mg/L TDS beforehand, the volumetric feed sent to thermal evaporation is slashed by up to 80%. This cuts thermal system capital expense and operational power costs drastically.

Standard containerized seawater RO and modular membrane concentration skids are fabricated and factory-tested in Shanghai within 60 to 90 days. Custom heavy thermal evaporation and crystallization systems typically require 120 to 180 days from process design sign-off to port dispatch, complete with detailed marine export packaging, Lloyd's or SGS inspection reports, and CE/ISO documentation.