Falling Film Evaporator Essential Oil Ethanol Vacuum 18kw SS304

The falling film evaporator is mainly used 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. The falling film distillation belongs to a liquid film concentrating device,which has a high heat transfer rate and a short heating time. 

The equipment is continuously operated under vacuum and low temperature conditions, with high evaporation capacity, energy saving and consumption reduction, low operating cost, and it can maintain the original color, aroma, taste and ingredients of the processed materials to the maximum extent. The theory is that the feed liquid is added into the evaporation chamber. Under the action of vacuum and gravity, the accelerating head of the liquid is smaller than the accelerating head of the ascending film type, and the boiling point is also small. There is a big temperature difference between the electric heating and the feed liquid, so the heat transfer effect is better. The steam enters the evaporation separation chamber for separation. The secondary steam is discharged from the top of the chamber and the concentrate is discharged from the bottom.

The evaporator can be designed into different process flow according to the characteristics of different materials to be processed, and can also be equipped with automatic control system according to the requirements of different users.

The complete working process can be concluded specificly as follows.

The first step is to remove the gas from the equipment to create a vacuum environment, replacing the material with water after the vacuum is sufficient. When the water flow runs smoothly (the water in the evaporator increases with the increase of walking, the material in the surface evaporation chamber is not higher than the sight glass), the circulation pump is turned on, the cooling water is input through the pipeline, the heating pipe is started, and the discharge pump is started. After the device is running well, adjust the throttling components at each location according to the random process flow diagram of the device. Then replace the material with water to run.

When the vacuum and temperature difference meet the requirements, the material is replaced with water for more than 4 hours. If the evaporation amount meets the requirements, it is qualified; otherwise, it is unqualified.

Start the vacuum pump first. In the case of a water ring vacuum pump, the water ring vacuum pump should be started at no load. After the water ring vacuum pump is in normal operation, the working water valve of the water ring pump is opened. When the vacuum and temperature difference for each effect reaches the required level, water should be used instead of the material to start the operation and start the condensate. After cutting off the water, place the material in the material tank. The sampling valve is initially opened, water is drained, and materials that do not meet the concentration requirements are placed in the tank. When the discharge concentration requirement is reached, open the discharge valve and close the sampling valve on the m aterial tank to make the equipment operate normally. 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 to avoid damaging the mechanical seal of the pump.

When it is time to stop working, use water instead of material to replace the material 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 piping should be drained to avoid freezing or clogging the pipeline.

When stopping due to an accident such as a sudden power failure, immediately close the valve, release the material stored in the equipment and its piping 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 piping, the material pump should be started first, so that the material runs smoothly when the vehicle is started, and then the vacuum pump is started.

During operation, if the degree of vacuum is low, especially after restarting after an unexpected shutdown such as a power outage, immediately find out if there are any leaks in the flanges and joints, and block the leak in time.

Equipment cleaning: After the equipment is completed, rinse the equipment and piping with water, 1-2% HNO³ 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. During the flushing or cleaning process, the equipment should not be cleaned with an aqueous solution containing hydrochloric acid or hydrochloric acid chloride to avoid intergranular corrosion of the stainless steel equipment and affect the service life of the equipment.

Falling Film Evaporator Maintenance

1. Always check whether the oil cup of the pump is short of oil, and whether the cooling water in the mechanical seal is broken.
2. Always check the flanges and joints of the equipment for air leakage.
3. When the mechanical seal of the pump is damaged, it should be replaced in time.
4. When the check valve rubber ball and rubber gasket are damaged, they should be replaced in time.
5. If the indications such as thermometer, vacuum gauge, pressure gauge, etc. are inaccurate, they should be proofread or replaced in time.
6. The surface of the equipment should not be rubbed with a hard scrubbing tool (such as steel brush) to avoid scratches and scratches on the stainless steel surface.