Set new benchmark with revolutionary,
Self-Cleaning Evaporator

Prevents fouling and frequent cleaning, saves huge maintenance cost and increases plant uptime

Self-cleaning technology increases efficiency and reliability of evaporators by significantly eliminating fouling. Developed by the Netherlands based Klaren International BV, the technology is now available in India through its local partner Shachi Engineering. The technology eliminates fouling and helps process plants to save on cleaning costs and also the downtime required for cleaning and maintenance.

However, the benefits of self-cleaning technology do not end here. With the additional use of mechanical vapor recompression, 41% of the primary energy used in self-cleaning process can be saved. In this process, the vapor coming from the evaporator is compressed to increase its pressure and temperature, and can be used in the shell side of the heat exchanger where it condenses. Thus, the energy used in evaporating the latent heat is recovered and the dependence on primary energy is significantly reduced.

When applying self-cleaning process to a multi-effect evaporator, you must choose the effect which generates the most amount of fouling. When this is done, the fouling in that one effect is eliminated, but it remains in other effects, even though its significance is considerably reduced. Mechanical vapor recompression also eliminates this problem.


The working of self-cleaning technology

The operating principle of the self-cleaning evaporator is based on the circulation of solid cleaning particles through the tubes of a vertical shell and tube heat exchanger. The fouling liquid flows upward through the tube bundle of the heat exchanger which incorporates specially designed inlet and outlet channels. Solid particles are fed to the fluid through the inlet channel.

A proprietary distribution system is employed to ensure a uniform division of particles over all the tubes. The particles are fluidized by the upward flow of liquid, where they create the mild scouring effect on the wall of the heat exchanger tubes, thereby removing any deposit at an early stage of fouling formation. After the tube bundle the particles disengage from the liquid in the separator and are returned to the inlet channel and the cycle is repeated.

To control the amount of particles fed to the inlet, a part of the inlet flow to the heat exchanger is used to push the particles from the down comer into the inlet channel. With the self-cleaning evaporator, many types of fouling deposits can be effectively handled, whether hard or soft, originating from biological, crystallization, chemical or particulate fouling mechanism, or a combination wouldn't affect the evaporation capacity.



  • Effluent Treatment
  • Chemicals
  • Oil & Gas
  • Food
  • Mining


Better energy performance

Because tubes remain clean and the heat transfer is constant

Enhanced productivity

Because equipment does not have to be taken out of production for cleaning, capacity remains constant, and in some cases the production yield can be increased


Because chemicals are not required as online additives or needed for cleaning purposes and there are no hazardous waste streams from cleaning

Compact design

Because of constant heat transfer no over dimensioning is required