High-salinity components in chemical wastewater (such as sodium chloride and sodium sulphate) readily cause equipment scaling and blockages, impairing evaporation efficiency. Low-temperature evaporators effectively address this challenge through targeted design and operational optimisation across three key aspects.

Firstly, anti-scaling and anti-clogging design. Operating within a low-temperature evaporation environment (30-60°C), these units slow the precipitation rate of salts compared to traditional high-temperature evaporation, reducing the likelihood of crystal adhesion to evaporator surfaces. Additionally, some low-temperature evaporators incorporate forced circulation systems. High-velocity pumps accelerate wastewater flow within the evaporator, creating a flushing effect that prevents salt crystal deposition. Furthermore, the inner walls of the evaporators are predominantly constructed from corrosion-resistant, low-adhesion specialised materials (such as 316L stainless steel or titanium alloys) and undergo polishing treatment. This reduces the substrate for salt scale adhesion and extends cleaning intervals.

Secondly, an efficient salt separation and discharge mechanism is employed. When wastewater is concentrated to salt saturation, the low-temperature evaporator separates salt from water via an integrated crystalliser: saturated brine entering the crystalliser slowly forms uniform crystals under low-temperature conditions, preventing sudden mass precipitation that could cause pipeline blockages. Certain units incorporate centrifugal separation modules to rapidly isolate crystallised salt slurry. Recoverable dry salt may be reused or disposed of compliantly, whilst the separated mother liquor returns to the evaporator for further concentration. This achieves complete salt removal, resolving the issue of incomplete concentration in high-salinity wastewater.

Finally, the system undergoes adaptive regulation. To address variations in salt composition across different chemical wastewater streams (such as scale-prone calcium and magnesium ions, or highly corrosive chloride ions), the low-temperature evaporator optimises salt precipitation conditions by adjusting evaporation temperature, vacuum levels, and adding small quantities of specialised scale inhibitors (e.g., polycarboxylates). Concurrently, the equipment incorporates an online monitoring system that continuously tracks parameters such as wastewater concentration and evaporator pressure. Upon detecting excessively high salt concentrations or abnormal flow rates, it automatically adjusts operational parameters or initiates cleaning procedures. This prevents system failures caused by high salinity, ensuring stable treatment of high-salinity chemical wastewater.