The working principle of MVR evaporation system
MVR evaporators is different from ordinary single-effect falling-film or multi-effect falling film evaporator, MVR for single evaporator, set multi-effect falling film evaporator, according to the different sectional evaporation, product concentration needed for the product in the first time after the effect body cannot achieve the required concentration, the product at the bottom of the left effect body through effect after body of vacuum pump products through effective body external pipe smoke to effect body upper again through the body, and then through the repeated through the body in order to achieve the required concentration.
Effect inside the body for the arrangement of pipe, tube inside for the product, and external to steam, in the process of the flow of the top-down product because membranous tube size and make the product flow, in order to increase the heating area, through the vacuum pump in the formation of negative pressure in the body, reduce the boiling point of water in the products, so as to achieve concentration, evaporation temperature is about 60 ℃.
Products after the effect of body heat evaporation of condensed water, steam and give body residual steam heated together through the separator separation, condensation water from the separator is used to preheat the lower and flows into the effect of body products, steam through the fan supercharger turbo (the higher the steam pressure, the greater the temperature), and then approved by the pressurized steam piping convergence a steam again through the body.
MVR requires preheating part of steam evaporation system startup, after the normal operation of the required steam will be reduced greatly, the fan supercharger by secondary steam pressure in the process of electrical energy into heat energy, steam and equipment required for steam to reduce operation process, but the amount of electricity greatly increased.
Products in the process of the work flow of the whole body temperature at about 60 ℃, the temperature difference between the heating steam and products remain at around 5-8 ℃, the product with the smaller temperature difference between the heating medium is conducive to protect the quality of the products, effectively prevent paste tube.
Product concentration at 50% when only MVR evaporators can be completed, when the required concentration of 60% is need to install the flash device.