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Evaporative crystallization process

Process Introduction

Based on the principle of "scientific and technological innovation, continuous improvement, and company development", and on the basis of advanced foreign technologies, combined with independently developed proprietary technologies for evaporation, crystallization, and concentration, integration, upgrading, and innovation have been carried out, resulting in the formation of evaporation and concentration technology, crystallization control technology, efficient pre heating technology, cogeneration technology, and tail gas purification technology. Provide modular design and engineering integration, gradually forming the unique evaporation and concentration energy-saving technology of Jiangsu Zhenjin. This technology has very good effects on evaporation, crystallization, concentration, and energy conservation, especially for the final effect condensate water, which is fully recovered to meet the standard, and the comprehensive utilization effect of energy is obvious.

Process Principle

1. The multi-effect evaporation system has high thermal efficiency, large system temperature difference, large operating flexibility, and less equipment investment. It is suitable for areas with large processing capacity, requiring salt separation, and equipped with steam systems in the plant area, with high electricity prices

2. MVR evaporation system has good energy-saving effect, low power consumption, and low operating cost. Simple process and small floor area, especially suitable for areas with small processing capacity, no steam system in the plant area, and high steam prices

3. The forced circulation evaporation process is widely used, with large processing capacity and high operating flexibility. Combined with suitable types of evaporation crystallizers, it can better control the grain size of the salt produced while treating high-salt wastewater, improving product quality

4. The falling film evaporation process has the advantages of good heat transfer efficiency, low steam consumption, compact equipment, low investment cost, high degree of automation, stable operation, and efficient recovery of residual heat

Technical Advantages

1. Reasonable selection of evaporation process to maximize energy saving and consumption reduction

2. Adopt separate effect preheating to fully recover the latent heat of condensed water

3. Use high-temperature condensed water as flushing water or boiling water to ensure that the feed temperature is not lowered

4. Increase the hydrostatic column to prevent vaporization in the heat exchange tube, thereby inhibiting the formation of scale layers

5. Using a forced circulation evaporator, selecting a reasonable flow rate, and relying on the scouring force of the fluid to avoid the formation of scale layers

6. Polishing the inner walls above and below the boiling liquid surface to avoid the formation of large salt blocks on the liquid surface due to the roughness of the inner wall

7. Reasonably select the height of the liquid column on the tube plate and the throttling diameter of the circulation pipe to ensure that there is no boiling in the heat exchange pipe

8. For pipelines that have been saturated or run with crystals, design appropriate flow rates, and add insulation, flushing, and purging devices

9. Reasonably arrange the equipment, minimize the pipeline of crystalline materials, and ensure that the pipeline is smooth and smooth

10. Select a suitable evaporation chamber form, add a tapered foot elutriation leg, dissolve small grains, and backwash back into the evaporation chamber to ensure the discharged crystal salt granularity

11. Select a reasonable evaporation chamber volume, control the retention time of the feed liquid, and promote the growth of grains

12. Maintain a stable supersaturation, control the growth rate of crystals, and timely discharge the grains that meet the requirements

13. Select reasonable equipment to prevent grain breakage and reduce secondary grain breakage

Performance Index

Evaporative crystallization efficiency can reach over 96%