Industrial Waste Water Treatment Three Effect Falling Film Evaporator

Industrial Waste Water Treatment Three Effect Falling Film Evaporator

Introduction

Falling film evaporation is to add the liquid to the upper tube of the heating chamber of the falling film evaporator. Through the liquid distribution and film forming device, it is evenly distributed into the heat exchange tubes. Under the action of gravity and vacuum induction and air flow, it forms a uniform film. Flow from top to bottom. During the flow, it is heated and vaporized by the shell-side heating medium, and the generated steam and the liquid phase enter the separation chamber of the evaporator. The vapor-liquid is sufficiently separated, and the steam enters the condenser for condensation (single-effect operation) or enters the next-effect evaporator. The medium is heated to achieve multi-effect operation, and the liquid phase is discharged from the separation chamber.

Application

Falling film evaporators are widely used in the evaporation and concentration of water or organic solvent solutions in the pharmaceutical, food, chemical, light industry and other industries, and can be widely used in the waste treatment of the above industries. Especially suitable for heat sensitive materials, the equipment is continuously operated under vacuum and low temperature conditions, with high evaporation capacity, energy saving, low operating cost, and can ensure the material is invariable during evaporation.

Working Principle

The liquid falling from the falling film is pumped into the top feed port of the falling film evaporator heating chamber. After the top enters, the material will be evenly distributed to each heating tube along the wall to form a film. In the process of flowing down, the feed liquid will be heated and vaporized by the shell-side heating medium due to the increase of temperature, and the generated steam and the liquid phase will enter the separation chamber of the evaporator, the vapor-liquid is fully separated, and the steam enters the condenser to condense (single effect) Operation) or entering the next effect evaporator as a heating medium to achieve multi-effect operation, the liquid phase is discharged from the separation chamber. In order to achieve the concentration effect, the multi-effect falling film evaporator has an additional use of secondary steam, so that the material concentration ratio is higher.

Equipment Component

Falling film evaporator mainly consists of evaporator (heat exchanger), separator, preheater, condenser, condensate tank, circulation pump and other components.