Figure1. The self-cleaning heat exchanger.

Innovate technology against fouling of heat exchangers

Our innovative technology presents a continuous cleaning method that uses solid particles against fouling of heat exchangers. These solid particles, made of glass, ceramic or metal (cut metal wire) with diameters of 1.5 to 5 millimetres, create a mild scraping or polishing effect on the wall of the heat exchange tubes. Their scouring action removes the fouling deposits from the tube wall at an early stage of formation and keeps the heat transfer surface clean. Besides this, the particles enhance the heat transfer at low liquid velocities and reduce pressure drop compared to conventional heat exchangers.

Suitable against fouling of all manner of heat exchangers

All shell and tube heat exchangers can be designed for zero-fouling of the respective heat transfer surfaces, as long as the rate of fouling removal by the scouring action of the particles exceeds the rate of fouling precipitation. The operation principle of this technology is explained below.

Operating principle of our technology

The operating principle of the self-cleaning fluidized bed heat exchangers operates up to zero-fouling and is based on the circulation of solid particles through the tubes of a vertical shell and tube heat exchanger. The fouling liquid is fed upward through the vertical shell and tube heat exchanger that incorporates specially designed inlet and outlet channels. The solid particles are also fed at the inlet, where a flow distribution system uniformly provides the liquid and suspended particles throughout the internal surface of the bundle. The particles are transported by the upward flow of liquid through the tubes, where they create the mild scraping or polishing effect on the wall of the heat exchangers. This ensures that any deposit is removed at an early stage of fouling formation. Inside a separator the particles disengage from the liquid and are returned to the inlet channel through an external down comer, and the cycle is repeated. The process liquid fed to the exchanger is divided into a main flow and a control flow that transport the particles into the heat exchanger.

By varying the control flow, it is possible to control the amount of particles in the tubes and to influence the cleaning mechanism.

Contact us for more information

Would you like to know more about Klaren International’s innovate technology which prevents fouling of heat exchangers? We will happily provide you with more information. Please feel free to contact our office in the Netherlands by phone at +31 85 27 34 834 or send an e-mail to


Contact us at:

Klaren International BV
Hanzeweg 35N
3771 NG Barneveld
The Netherlands

Phone: +31 85 27 34 834

Any questions?

We would be happy to answer them.

+31 85 27 34 834