System designed for production of food grade sea salt from sea water using MVR evaporation crystallization.
Design processing capacity is 10 t/h, evaporation capacity is 8 t/h, discharge is 2 t/h after centrifugation and crystallization.
System operates 20 hours per day.
Steam condensate is used as reuse water in zero-discharge systems or treated separately.
Centrifuged NaCl crystals are dried in a fluidized bed.
Raw Material Parameters
Feed quantity: 1 t/h, sent 1 m outside the device frame.
Evaporation capacity: 0.8 t/h, sent 1 m outside the device frame.
Amount of solid: 0.2 t/h, drying system outside 1 m.
Feed pH: 7, neutral partial alkali.
Concentration: 20%.
Feed temperature: 25 °C.
Material boiling point: 8 °C, saturated boiling point of NaCl rises.
Mode: MVR forced circulation evaporator.
If calcium and magnesium ions in influent water are higher than 50 mg/l, pretreatment at the front end is necessary.
No obvious solid in the inlet water.
Technical Requirements
Device uses MVR forced cycle evaporation crystallization process with a centrifugal steam compressor as core equipment to continuously evaporate and crystallize NaCl solution.
NaCl solution is driven by pump, heated by preheater, enters MVR evaporation crystallizer, continuously evaporates and crystallizes, concentrates to corresponding ratio, then enters centrifuge to separate NaCl crystals.
NaCl solids are dried by a vibrating fluidized bed dryer and discharged; centrifugal mother liquid returns to evaporator.
Design meets requirements for automatic operation under various working conditions; startup, normal operation monitoring, and accident handling are basically automated in the system control room.
Equipment supply scope includes: preheating system, evaporation crystallization system, centrifugal steam compressor, crystal slurry thickener, centrifugal separation, vulcanization bed drying, pipeline valve system, instrumentation and control system, electrical equipment, other auxiliary equipment, and all system equipment selection supply, installation guidance, commissioning, and training services.
Parameters of each component and control system are designed and supplied by party B; system is controlled by PLC with an interface for communication; operator can monitor and adjust operating parameters through operator station in control room.
Manufacture and design of all equipment meet requirements for safe, reliable, continuous, and effective operation; availability rate of device is ≥ 99% after performance acceptance test.
Device can be quickly started and put into operation, has good adaptability when load is adjusted by 70% to 110%, and runs reliably and continuously under operating conditions.
Device and all auxiliary equipment can be put into operation without interference with the main device operation mode.
Process Flow
Material is pumped into system through feed pump; flow is monitored by electromagnetic flowmeter.
Condensate water is preheated to recover energy before entering evaporation system.
Material enters forced circulation heater for heating and pressurization, then enters separator for flash evaporation.
Solution concentration increases until crystallization is precipitated.
Crystallized slurry is pumped out by discharge pump to thickener, then discharged into centrifuge.
Centrifugal mother liquor is returned to system for further evaporation.
Centrifuge solids enter vulcanization bed for further drying and are finally discharged for separate treatment.
See the process diagram for details.
Process Characteristics
MVR evaporation system process is divided into seven processes: feed, preheating, evaporation crystallization, steam compression, centrifugal desalination, mother liquor reflux, and curing bed drying.
Feeding process: salt water enters condensate preheater, non-condensing gas preheater, and generating steam preheater through feed pump, then enters MVR evaporation crystallization chamber; when liquid level reaches set level, forced circulation pump starts and feed pump stops.
Preheating process: boot preheating opens steam valve to heat FC heater until feed liquid temperature reaches set evaporation temperature; when frequency reaches 40 Hz, rising frequency stops and system stabilizes for about 5 minutes; compressor current increases and load is loaded; system automatically closes steam valve and stops use of raw steam; system switches to evaporation process.
Normal preheating operation: brine at 25 °C is preheated from 25 °C to 85 °C by condensate preheater, non-condensable gas preheater, and steam preheater in turn, then enters FC forced circulation system.
Evaporative crystallization process: brine solution is mixed with FC circulating liquid, enters FC heater and shell steam heat exchange heats up; heated material liquid enters tangential line at bottom of evaporation crystallizer, slowly rotates and rises; fine crystals are dissolved, large particles gradually grow; after flash, feed liquid changes from saturation to supersaturation; supersaturation is used for crystal growth; grown crystalline salt is collected through salt foot and fed into centrifuge.
Steam compression process: secondary steam evaporated from crystallization chamber is fully set.
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