Core technology principle and workflow of double tube plate multi effect distilled water machine

1、 Core technical principles

1. Multi effect cascade distillation

The equipment achieves cascade utilization of thermal energy by connecting 3-6 effect evaporators in series. Only the first effect requires external industrial steam heating (usually 127 ℃), and the subsequent effect stages use the secondary steam generated by the previous effect as a heat source. The raw water forms a falling liquid film in each evaporator for rapid evaporation, and the unevaporated part enters the next effect in sequence. The final effect concentration shrinkage discharge rate is less than 15%, and the thermal energy utilization rate is increased by more than 60% compared to single effect equipment.

2. Three level separation mechanism

• Falling film evaporation separation: The raw water forms a thin film in the evaporation tube, and preliminary gas-liquid separation is achieved through rapid evaporation.

Gravity reversal separation: When steam flows back 180 ° at the lower end of the evaporator, impurities are separated due to gravity settling.

Centrifugal filtration composite separation: Special separation devices (such as spiral baffles+wire mesh demisters) remove micron sized particles through centrifugal force and filtration to ensure steam purity.

3. Anti pollution design of double tube plate

The key components (evaporator, condenser) adopt a double tube plate structure, forming an isolation chamber between the two tube plates. When a leakage occurs on one side, the medium is discharged through the discharge hole, blocking the cross contamination between industrial steam/cooling water and distilled water.

2、 Detailed explanation of workflow

1. Raw water pretreatment

After being pressurized by multi-stage pumps, purified water enters the condenser for preheating to above 80 ℃, and then further heats up through various preheaters in sequence.

2. Evaporation condensation cycle

First effect evaporation: The preheated raw water is evenly sprayed onto the inner wall of the evaporation tube through a distributor, heated and vaporized by industrial steam, producing secondary steam.

Multi effect transmission: The secondary steam enters the next effect as a heat source and condenses into distilled water; The raw material water that has not evaporated automatically flows into the next effect through the pressure difference between effects.

Final effect treatment: The final effect secondary steam and distilled water from each effect are combined into a condenser, and after cooling, injection water at 92-99 ℃ is output.

3. Online quality control

The produced water is monitored in real time through a conductivity meter, and unqualified water is automatically discharged.