MVR evaporator is a new type of energy-saving evaporation equipment mainly used in pharmaceutical industry. The equipment uses low temperature and low pressure steam technology and clean energy to generate steam as energy to separate water in the medium. It is an advanced evaporation technology. It is an upgraded product to replace the traditional evaporator. MVR evaporator is different from ordinary single-effect falling film evaporator or multi-effect falling film evaporator. MVR is a single evaporator with integrated multi-effect falling film evaporator. When the required concentration cannot be reached through the effector at one time, the product will be pumped to the upper effector of the effector through the vacuum pump at the bottom of the effector through the external pipe of the effector, and then pass through this repeated channel again and again. The agent reaches the required concentration.
The inside of the MVR evaporator is a row of thin tubes, with products inside and steam outside. In the process of product flowing from top to bottom, the area of the pipe increases, thus increasing the heating area, and the product flows in the form of film. A negative pressure is formed in the MVR evaporator, which reduces the boiling point of water in the product to achieve concentration. The evaporation temperature of the product is about 60 ℃.
The condensed water produced after the product is heated and evaporated by the MVR evaporator effect body, part of the steam and the residual steam after the effect body heating are separated by the separator. Condensate flows out from the lower part of the separator to preheat the products entering the effect body. The steam is pressurized by the fan supercharger (the higher the steam pressure, the higher the temperature), and then the pressurized steam is combined through the pipe, and the steam passes through the effector again.
When the MVR evaporator is started, some steam needs to be preheated. After normal operation, the amount of steam required will be greatly reduced. When the fan supercharger pressurizes the secondary steam, the electric energy is converted into steam heat energy. Therefore, it is necessary to reduce the operating steam of MVR evaporator and greatly increase the required electric power.
During the whole flow process of the effector, the temperature of the MVR evaporator is always around 60 ℃, and the temperature difference between the heating steam and the product is also around 5-8 ℃. The smaller the temperature difference between the product and the heating medium, the better the protection of the product. When the product concentration is about 50%, only MVR evaporator can complete. When the required concentration is 60%, flash equipment is required.
