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The introduction of Forced circulation evaporator and crystallizer

In a forced circulation evaporator, liquor is pumped through tubes at a velocity of 1-3 m/s and is heated 1-5°C.  Crystals and fouling material in the liquor behave as they would in a pipe of the same diameter with the same velocity.  The small amount of heating has some negative effect but not much.  If liquor can be pumped through a pipe, it can be pumped through a forced circulation evaporator.  Recirculation pumps for forced circulation are much larger than for falling film but the head can be very low, especially for salt crystallizers. Since pipes can plug or foul with a slurry, so can a forced circulation evaporator. However, there will be less fouling than with falling film.

When combining with falling film, as much pre-concentration as practical is done in falling film, and then forced circulation is used for the high concentration stages.  This reduces operating and investment cost.

Product Advantages

It has a wide use of materials, and the advantages of big concentration factor, high discharge concentrate, resist scaling and plugging etc.

Applications

1 Typical concentrating example

Corn steep liquor, alcohol waste, lysine waste, fermentation liquor with thallus, yeast waste, penicillin waste etc.

2 Typical crystallizing examples

Vc, citric acid, lysine, threonine and other amino acid, sodium chloride, ammonium sulfate, sodium sulfate, magnesium sulfate, sodium phosphate, sodium carbonate, ammonium carbonate, sodium nitrate, lithium hydrate and lithium carbonate.

Technological Process

Project Cases