Containerized Boiler Water Softening System

After pretreatment, the water enters the ultrafiltration membrane system. Ultrafiltration membrane is a kind of pressure-driven membrane separation technology with a molecular weight cut-off of 10,000-100,000 Dalton. It can effectively remove colloids, macromolecular organic matter, bacteria, viruses and other microorganisms in water, further purifying the water quality.

Key design points of the system: Adopts external pressure type or internal pressure type hollow fiber ultrafiltration membrane according to water quality conditions; equipped with automatic backwashing and chemical cleaning devices, which can regularly clean the membrane surface to prevent membrane fouling and extend the service life of the membrane; the membrane module is easy to disassemble and replace, which reduces maintenance costs. The effluent SDI of the ultrafiltration system is ≤ 1, which provides high-quality inlet water for the subsequent nanofiltration system.

The nanofiltration membrane system is mainly used to remove divalent ions (such as calcium, magnesium, sulfate ions) and part of monovalent ions in water, and further reduce the hardness and total dissolved solids (TDS) of water. Nanofiltration membrane has a higher rejection rate for divalent ions (rejection rate ≥ 95%) and a certain rejection rate for macromolecular organic matter, which can effectively reduce the load of the subsequent ion exchange system.

System configuration: Equipped with high-pressure pump, nanofiltration membrane module, pressure vessel, automatic flushing valve and chemical cleaning system. The operation parameters (pressure, flow rate, recovery rate) are precisely controlled by the electrical system to ensure stable effluent quality. The recovery rate of the nanofiltration system can reach 70-85%, which improves water utilization efficiency and reduces water waste.

As the core water softening unit, the ion exchange system is used to deeply remove the remaining hardness ions (calcium, magnesium ions) in the water after nanofiltration treatment, so that the hardness of the treated water is ≤ 0.03mmol/L, which fully meets the requirements of boiler feed water (especially for high-pressure boilers).

The system adopts cation exchange resin (sodium type) as the core medium. When the water passes through the ion exchange column, the calcium and magnesium ions in the water are exchanged with the sodium ions on the resin, so as to achieve the purpose of softening the water. The system is equipped with two ion exchange columns (one for operation and one for regeneration), which can realize automatic switching and regeneration. The regeneration process uses sodium chloride solution (brine) to restore the exchange capacity of the resin, ensuring continuous and stable operation of the system. In addition, the system is equipped with a resin trap to prevent resin loss and protect the subsequent boiler equipment.