0.09MPa Laboratory horizontal thin film evaporator

The function of falling film evaporators is to separate the ethanol from material and condense and recover it through reduced pressure vacuum and evaporation. It is suitable for the production of chemicals, liquid medicines, juices and dairy products widely used in many fields.

Working Principle

The materials are evenly distributed into each falling film pipe through the distributor, and flow down the wall of the pipe in the state of a liquid film. Under the action of gravity and the secondary steam flow, the materials get evaporated while flowing down. At the bottom of the falling film tube, the materials and secondary steam are basically separated, and they reach the separation chamber to achieve complete separation.

Operation Procedures

1. The first step is to remove the gas in the equipment to create a vacuum environment and after the vacuum degree is enough, feed water in replacing materials. When water is running smoothly (the water in the evaporator increases with the increasing in walk, surface evaporation indoor materials are not higher than sight glasses), open circulating pump, cooling water is piped in, start the heating tube and start the discharge pump. After the equipment runs well, adjust throttling components in each position according to the the random process flow chart of the equipment. Then replace the material with water for running. When the vacuum degree and temperature difference meet the requirements, replace the material with water for running for more than 4 hours. It is qualified if the evaporation capacity meets the requirements; otherwise, adjust the throttle element again.
2. Firstly start the vacuum pump. If it is a water ring vacuum pump, the water ring vacuum pump should be started at no load. After the water ring vacuum pump is running normally, the working water valve of the water ring pump is opened. When the vacuum and temperature difference of each effect reach the required level, water should be used instead of the material to start the operation and start the condensate. After the water is cut off, the material is put into the material tank. The sampling valve is initially opened, the water is discharged, and the material that does not meet the concentration requirement is placed in the tank. When the discharge concentration requirement is reached, the discharge valve is opened, and the sampling valve on the material tank is closed, and the equipment is put into normal operation.
3. During the operation of the pump and before starting, it should be observed that the cooling water of the mechanical seal of the pump must not be interrupted, so as not to damage the mechanical seal of the pump.
4. When the work is to be stopped, water is used instead of the material to replace the materials in the equipment and its piping to prevent the material from crystallizing or solidifying in the equipment and its piping. When the ambient temperature of the equipment is below 0 °C, the water in the equipment and its pipeline should be drained to avoid freezing or blocking the pipeline.
5. When parking due to accidents such as sudden power failure, immediately close the valve, release the materials stored in the equipment and its pipeline as soon as possible, or dilute the heated water until it does not crystallize or solidify. When there is material in the equipment and its pipeline, the material pump should be started first to make the material run smoothly when starting the vehicle, and then the vacuum pump is started.
6. During the operation, if the degree of vacuum is low, especially after restarting after accidental parking caused by power failure and so on, immediately find out if there is leakage at the flange and the joint, and block the leak in time.
7. The cleaning of equipment:After the equipment is finished, the equipment and its pipelines are washed and cleaned with water, 1-2% NaoH aqueous solution, clean water, 1-2% HNO3 aqueous solution and clean water. The pump is pumped with the above washing liquid, and each washing liquid should not be less than 10 minutes.

The equipment should not be washed by using hydrochloric acid or hydrochloric acid chloride-containing aqueous solution during scouring or cleaning to avoid intergranular corrosion of stainless steel equipment and affect the service life of the equipment.