Novel MVR rotating-film evaporator

Abstract

The invention belongs to the technical field of evaporators, and particularly relates to a novel MVR rotating-film evaporator. The novel MVR rotating-film evaporator structurally comprises a tank body, a vapor-liquid separator, a secondary rotating film atomization device, a primary rotating film atomization device and a vapor-liquid damping net are sequentially arranged in the tank body from top to bottom, a vacuum evaporation area is formed in the tank body on the upper portion of the vapor-liquid separator, and a rotating film atomization area is formed in the tank body between the vapor-liquid separator and the vapor-liquid damping net. A concentrated liquid collection area is formed in the tank body below the vapor-liquid damping net, and the secondary rotating film atomization device and the primary rotating film atomization device are both located in the rotating film atomization area and used for spraying out feed liquid and vapor in a spiral atomization mode. According to the invention, the rotating-film atomization area can atomize and disperse feed liquid and steam in a water film shape, so that the feed liquid and the steam can be uniformly contacted, mixed and heated, and the upper area of the vapor-liquid separator and the upper area between the vapor-liquid separator and the secondary rotating film atomization device are in a micro-negative pressure state, so that the boiling point of the feed liquid can be reduced, and the evaporation efficiency of the feed liquid is improved.

Description

technical field [0001] The invention belongs to the technical field of evaporators, in particular to a novel MVR rotary film evaporator. Background technique [0002] MVR evaporator is the main equipment for evaporation, concentration or crystallization of various liquids, and it is widely used in the fields of "zero discharge project of sewage treatment", pharmaceutical and chemical production. [0003] The process of the MVR evaporator is that the preheated material liquid first enters the MVR evaporator, and is heated by high-temperature steam in the evaporator, and the temperature rises. Under the suction of the vacuum pump, the mixed material liquid rises to In the upper part of the vapor-liquid separator, due to the evaporation of the feed liquid, the secondary steam overflows and rises. The secondary steam is pressurized by the vacuum pump and then enters the evaporator again to be fully utilized, recovering latent heat and improving thermal efficiency; the feed liqui...

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Problems solved by technology

[0005] The present invention provides a novel MVR rotary film evaporator to solve the problem that the existing MVR evaporator needs to add additional evaporation tanks or other working tanks for separating steam and feed liquid when performing secondary evaporation, resulting in increased costs, and at the same time When the steam enters the evaporator during operation, due to the uneven distribution of steam in each heat exchange tube and the inconsistent heating temperature of the feed liquid, the evaporation efficiency is low; Reduced equipment efficiency and waste of energy

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