Thermal evaporation crystallizer uses steam as energy to evaporate wastewater under negative pressure at 35 ℃ low temperature. Extract crystal clear distillate to reuse and leave trace solid crystallization waste with moisture 20% or less. The whole process is fully automatic with 24 hours continuous unmanned operation. It's totally in-one-stop solution and is true sense of Zero liquid discharge.The special designed inside scraper scraps tank wall and mixes wastewater to prevent crystal condensation in tank wall. This greatly reduces scaling risk and cleaning frequency. In the same time, the stiring also increases the wastewater evaporation efficiency. It can be widely used in pharmaceuticals, new energy, RO reject, MVR concentrated liquid, chemical, etc.