Kang Jinghui Xiaobian will talk to you about the integrated MVR evaporator for NMMO concentration.
1. NMMO water quality sources
In the production process of lyocell fiber, the tow washing process needs to be cleaned with clean water to clean the NMMO entrained by the tow, in order to achieve a more thorough cleaning effect, it is necessary to ensure a large amount of flushing water, which causes the concentration of the obtained NMMO solution to be too low, so the solution must be evaporated and concentrated and then recycled.
2. Common NMMO solvent treatment methods
The existing NMMO solvent evaporation mainly uses multi-effect evaporator or its upgraded TVR evaporator, but the evaporation process of multi-effect evaporator or TVR evaporator is long, the equipment is many, the investment is large, the energy consumption is high, and the efficiency is low.
3. Integrated MVR evaporator for NMMO concentration
All-in-one MVR evaporator for NMMO concentration:
Including dilute solution storage tank, feed pump, integrated evaporator, compressor system, secondary steam temperature control system, condensate pump, condensate heat recovery system, forced circulation system, high temperature hot water tracing concentrate storage tank and condensate recovery tank, the dilute solution stored in the dilute solution storage tank is transported to the integrated evaporator through the feed pump.
Because the first pipeline and the second pipeline are corresponding to the condensate heat recovery system, the dilute solution in the first pipeline absorbs the sensible heat of the condensate in the second pipeline, the compressor system is used to cooperate with the integrated evaporator to concentrate the dilute solution, the forced circulation system is started, the material is circulated internally, and the concentrated NMMO solvent is transported to the high-temperature hot water heating concentrate storage tank, and the above-mentioned structural equipment is highly integrated, and the supporting equipment and facilities are few, and the cost is low.