Double-effect evaporative crystallization system for wastewater from lithium battery industry potassium chloride
What are the of Features and Advantages of the MEE system to be used in for the wastewater treatment plant?
According to the characteristics of the material and the size of the evaporation capacity, it can be designed as a single-effect or multi-effect evaporation unit, with flexible equipment combination and large operating space;
The heat transfer coefficient of the multi-effect evaporation system is relatively high, the heating time of the material is short, and the evaporation temperature is low, which can effectively reduce equipment corrosion.
The multi-effect steaming system makes full use of the latent heat of the secondary steam of the material to minimize heat emission and reduce the consumption of raw steam.
The heat exchange tube of the multi-effect evaporation system is not easy to foul, with high heat transfer efficiency, large operating flexibility, reliable operation and long operating cycle.
Material process
(1) The raw material is delivered to the front primary preheater by the feed pump through the electromagnetic flowmeter, and then enters the top of the primary effect heater through the liquid distributor for primary falling film evaporation and concentration;
(2) The first effect concentrated liquid is transported to the top distributor of the second effect heater by the first effect bottom material circulating pump for secondary falling film evaporation concentration.
(3) The second effect concentrated liquid is transported to the top distributor of the third effect heater by the second effect bottom material circulating pump for third times of falling film evaporation concentration;
(4) Third effect concentrated liquid discharge, according to the online detection of the hydrometer, real-time detection of the material concentration, if the material concentration reaches the set requirements, it will be interconnected with the discharge valve to open the discharge valve and transport the material to the finished product tank, otherwise, it will open the material circulation valve to make the material recycle into the evaporator again for re evaporation.
Steam process
The raw steam enters the primary effect heater for heating evaporation concentration: the secondary steam generated by the primary effect heats the secondary effect, and so on. The secondary steam generated by the third effect enters the end condenser for condensation cooling, and the condensate water is discharged by the condensate pump.
Condensate process
The condensate water produced by the primary effect preheating the materials through the water transfer pipe at the bottom of the shell, to save the consumption of raw steam;
The condensate water produced by the secondary and third effect is discharged by the condensate pump, and the discharge has reached zero pollution. The non condensing gas is connected to the end condenser by the non condensing gas pipe and discharged by the vacuum pump.
Major Advantages of Multi-effect systems:
Ability to maximize usage of input energy (steam economy)
Reduced energy required to run full system
Reduced condensing load with additional effects (less cooling water needed)
Liquor flow control
Convenient foul condensate collection and processing
Ability to do online cleaning of individual effects
Maximum thermal efficiency with concurrent flow option
| Type | Single effect | Double effect | Three effect |
| Evaporative capacity (kg/h) | 300-2000 | 1200-4000 | 3600-15000 |
| Feeding material density % | According to material | ||
| Discharge material density % | According to material | ||
| Steam pressure | 0.5-0.8 | ||
| Steam consumption / Evaporative capacity(with heat pressure pump) | 0.65 | 0.38 | 0.28 |
| Evaporating temperature | 45-90 | ||
| Sterilizing temperature | 90-110 | ||
| Cooling water consumption / Evaporative capacity (inlet 20°C, outlet 40°C) | 28 | 11 | 8 |
| Note: we can design custom product according customer's requirement. | |||
Working principle
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