Working principle of multi-effect evaporator:
The principle of multi-effect evaporator is to drive one effect to produce evaporation through fresh steam, and then use the secondary steam generated in one effect to drive the next effect to evaporate, so as to achieve the purpose of energy saving. In order to reduce the consumption of primary steam, the secondary steam generated in production is introduced into two evaporators for heating steam. The secondary steam generated by the two evaporators can also be introduced into the third evaporator for heating steam. Each evaporator is called one effect, and so on. In this way, several evaporators are operated in series to form a multi-effect evaporator.
Multi-effect evaporator has developed from a relatively primitive evaporator to a single-effect, double-effect, triple-effect, quadruple-effect or more effect evaporator, all of which aims to gradually reduce energy consumption.
Single-effect evaporation consumes 1.1~1.2 tons of steam per ton of water, double-effect evaporation consumes 0.6~0.7 tons of steam per ton of water, triple-effect evaporation consumes 0.37~0.46 tons of steam per ton of water, quadruple-effect evaporation consumes 0.3~0.35 tons of steam per ton of water, and five-effect evaporation consumes 0.24~0.3 tons of steam per ton of water.
Kang Jinghui Environmental Protection Company’s multi-effect evaporation system often considers recycling the heat of condensed water or secondary steam to achieve energy saving. In wastewater treatment, automatic online cleaning of preheater scaling should also be considered.
Multi-effect evaporators can adopt various forms such as forced circulation, natural circulation, falling film, rising film, plate evaporator, etc., and can also adopt various combinations to optimize the process flow.
Process of multi-effect evaporation:
Downstream, countercurrent, horizontal flow, cross flow, etc.
Technical parameters of multi-effect evaporator:
Single-effect evaporation consumes 1.1~1.2 tons of steam per ton of water, double-effect evaporation consumes 0.6~0.7 tons of steam per ton of water, triple-effect evaporation consumes 0.37~0.46 tons of steam per ton of water, quadruple-effect evaporation consumes 0.3~0.35 tons of steam per ton of water, and five-effect evaporation consumes 0.24~0.3 tons of steam per ton of water.
