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Salt and Marine Chemicals

Title of Process/ Know-how/ Product/Design/Equipment

System to increase solar salt yield by enhancing evaporation rate of brine using a solar assisted heat exchanger

Application/Uses/Problem being addressed

Annual salt demand in India is rising by 5-6%, driven largely by rise in industrial consumption. The unseasonal rains during the salt season and frequent cyclones, heavy and intense rainfall, flooding and drastic climate change over the globe acts as one of the major factors driving the growth of the industrial salt market due to crop loss. The developed system is used to increase the salt yield per acre salt pond area by enhancing evaporation rate of brine.  The invented system will reduce the time taken for producing salt during summer and winter seasons and to increase the salt production by enhancing evaporation rate of brine.

Salient Technical Features including Competing Features/ Impact
  • Solar assisted Heat enhancing system
  • Simple processing steps
  • Minimized energy consumption
  • Continuous process
  • Yield and quality can be increased
  • Environmentally friendly
  • Short payback period of 1.5 years
  • TRL Level & Scale of Development:
    Business scope & opportunity (in terms of scale, cost, market etc.):

    With the consistent fall in salt production over the years in all the salt producing regions of India, the prices of soda ash have gone up 70 % during the past four years. Similarly, even edible salt prices have gone up 20 % due to reduced production over the year. System is to produce an industrial grade salt & also endeavor to increase the evaporation rate, whiteness index & production rate. The salt production quality can be increased by reducing salt cycle duration by 30-40 % compared to natural solar evaporation.  The increase in demand for the product for various industrial applications is escalating the growth of industrial salt market.

    Environmental Considerations:

    This is an eco-friendly process. Completely based on renewable energy / solar energy

    Status of Licensing:
    Ready for transfer
    Status of Commercialization:
    Not applicable
    Major Raw Materials Needed

    Sea water/Subsoil brine, Freshwater

    Major Plant Equipment and Machinery Required

    Solar water heater, Brine pond/tank, Hollow tubes, Rotameter, Thermocouple, Pump, Solar panel, Overhead tank, hollow pipes

    Techno-Economics

    The evaporation rate will be increased 40 % higher than the natural solar evaporation depending on the climatic conditions.

  • Evaporation rate increased : 5.24 mm/day w.r.t. Blank
  • 80 % higher rate of evaporation in lab scale prototype
  • 67 % higher rate of evaporation in medium field scale
  • 53.5 % higher rate of evaporation in large field pond
  • Mixed salt (ranging from 29o to 34o Be) can be produced
  • The salt yield increased by enhancing evaporation rate between the salt compartment of Reservoir-1 (from 3o to 5o Be) by proposing present system in brine channel.

  • 25 % area of the salt works can be reduced.
  • The payback period of the system is 1.5 years, when implemented in brine intake channel to increase the evaporation rate of brine and salt yield. To be worked out based on proposed capacity.

    Technology Package
  • Design details & Flow diagram (Case-to-case basis)
  • System validation & Demonstration
  • Basic Engineering Package
  • Detailed Project Report (Case-to-case basis)
  • Technology Transfer with consultation
  • Post Technology Transfer hand-holding
  • Heat exchanger system