The sodium chloride single-effect evaporator is an advanced device used to concentrate NaCl-containing solutions, providing energy savings and high efficiency. Designed for a variety of industrial applications, such as chlor-alkali production, seawater desalination, and wastewater treatment, this evaporator system operates through a carefully structured multi-step process.
1. Pre-Concentration
The process begins with the feed liquid, which is preheated using a multi-stage plate preheater. This system recovers sensible heat from the condensate and raises the temperature of the liquid to between 75-85℃.
2. Forced Circulation Evaporation
Next, the liquid flows through a system where an axial flow pump maintains a velocity of 2-4 m/s. This ensures that the evaporation temperature stays within the optimal range of 75-90℃, allowing the efficient evaporation of water.
3. Vapor Recompression
In this stage, secondary steam at 75-80℃ is compressed using a high-speed centrifugal or Roots compressor. The steam’s temperature is raised to 105-110℃, and the compression ratio is between 1.6 and 1.8. This process effectively recycles energy, improving efficiency and reducing costs.
4. Gas-Liquid Separation
To prevent the buildup of liquid in the compressor, a two-stage baffle and wire mesh demister ensure that the mist entrainment remains under 20 ppm. This step guarantees smooth operation and avoids liquid hammer issues in the system.
5. Crystallization and Discharge
The sodium chloride crystals are formed in a crystallizer {either DTB or OSLO type}, where they grow in stages to achieve a particle size of 0.3-0.6 mm. After centrifugation, the industrial salt’s moisture content is reduced to ≤3%, and the system operates continuously and stably with a mother liquor reflux ratio of 20-40%.
This process ensures that the sodium chloride evaporator system is highly efficient, energy-saving, and ideal for industries requiring NaCl concentration and crystallization, all while offering environmentally friendly and cost-effective solutions.
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