Mechanical vapor recompression evaporation crystallization system, Kang Jinghui evaporator and talk about mechanical vapor recompression evaporation crystallization system.
In the context of the huge industrial wastewater treatment market, the mechanical vapor recompression (MVR) technology is used to obtain raw materials for production while carrying out advanced treatment of industrial wastewater, so as to realize the resource utilization of wastewater.
Zero discharge of high-salt wastewater treatment
From emission reduction to emission restriction to zero discharge, wastewater discharge standards are gradually rising. In order to achieve "zero discharge", the focus is to achieve the full quality of high-salt wastewater, and the essence is to realize the separation of water and salts in wastewater.
At present, the concentration technology, crystallization technology and the technology after the coupling and synergy of the two technologies are mostly used to achieve zero discharge of high-salt wastewater.
Of course, sometimes depending on the actual situation of high-salt wastewater, it is necessary to add pretreatment technology before the technology in order to provide better treatment conditions for the subsequent process. As the core process of high-salt wastewater resource treatment, concentration can be divided into thermal concentration and membrane concentration according to different treatment objects and application scopes. Among them, the thermal concentration technology is suitable for treating wastewater with high TDS and COD up to hundreds of grams per liter, and the ions in the high-salt wastewater are highly concentrated through heating.
Mechanical vapor recompression evaporation crystallization system
Mechanical vapor recompression (MVR) evaporation technology is an energy-saving technology that reuses the secondary steam energy generated in the evaporator, thereby reducing the external energy demand.
Mechanical vapor recompression evaporation crystallization systemPrinciple
Principle of mechanical vapor recompression evaporation crystallization system: the secondary steam generated in the evaporator is compressed by the compressor to increase the pressure and temperature, and the enthalpy value increases, which is used as the heating heat source of the evaporator system, and the compressed steam releases latent heat and condenses into condensate, and the material absorbs heat to continue to produce secondary steam, and the secondary steam repeats the above process, so that the material continues to circulate and evaporate, and the system instrument needs the compressor to provide energy.
In a mechanical vapor recompression evaporation crystallization system, the heat source in the preheating phase is provided by a steam generator until the material begins to evaporate to produce steam. The secondary steam produced by the material after heating is compressed into high-temperature and high-pressure steam by the compressor, and the high-temperature and high-pressure steam generated here is used as the heating heat source, and the material in the evaporation chamber is continuously evaporated by heating, and the high-temperature and high-pressure steam through the compressor is cooled into condensate, that is, the treated water. As the heat source of the whole system, the compressor realizes the conversion of electrical energy to heat energy, and avoids the dependence and ingestion of steam generated by the whole system from the outside world.
Mechanical vapor recompression evaporation crystallization system for the treatment of high-salt wastewater
Based on MVR technology, a mechanical vapor recompression evaporation crystallization system was proposed, which was used in combination with a rising film evaporator and a forced circulation evaporator. The process is that after the material is preheated, it reaches the bubble point temperature and enters the rising film evaporator for evaporation, the solution is concentrated to a state close to saturation and separated in the separator, and the separated secondary steam is compressed by the compressor to heat the two evaporators, and the separated concentrate is forced to circulate and concentrate crystallization. Its main feature is that it realizes the three major cycles of secondary vapor compression recycling, concentrated forced circulation evaporation and condensate recycling, which has a novel circulation structure and combines the advantages of the rising film evaporator and the forced circulation evaporator, and the energy saving effect is better. The rising film evaporator concentrates the material close to saturation and evaporates a large amount of water, thus greatly reducing the power required by the forced circulation evaporator, and the forced circulation crystallization makes up for the problem that the rising film evaporator cannot be used for crystallization.