Keep your equipment operational with Klaren International’s self-cleaning heat exchanger technology. Vertical shell and tube heat exchangers operate with a clean surface, due to the application of a fluidized bed of solid particles. Conventional heat exchangers have the problem of severe fouling in the tubes. This can happen in just a matter of hours in severe cases. With the solid particles of our innovative self-cleaning heat exchanger technology, solid particles will be continuously cleaning the walls of the heat exchanger tubes with a mild scouring effect. These solid particles have diameters of 1.5 to 5 millimetres and consist of glass, ceramic or metal. A constant heat transfer coefficient is maintained by cleaning the heat exchanger tubes at an early stage of formation. Moreover, these particles reduce pressure drop compared to conventional heat exchangers and enhance the heat transfer at lower liquid velocities. When the rate of removal of deposits by the particles exceeds the rate of precipitation of deposits, zero-fouling is guaranteed.
The cleaning principle of the heat exchanger tubes is an ongoing cycle. It is based on the circulation of solid particles through the tubes of a vertical shell and tube heat exchanger. First, the fouling fluid flows up through the heat exchanger tube bundle and passes through the inlet and outlet channels. These channels are specially designed for this process. Second, the solid particles are fed to the fluid using a distribution system in the inlet channel. This happens to ensure consistent division of particles over all the tubes. The particles are then fluidized by the upward flow of liquid to remove any deposit at the beginning of fouling formation. They create the mild scouring, cleaning effect on the wall of the heat exchanger tubes. Lastly, after the particles are detached and separated from the liquid by the tube bundle, they move to the inlet channel through an external downcomer. After this, 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 downcomer into the inlet channel. Changing the amount of particles is one of the parameters to influence the cleaning mechanism. Other parameters are particle size and material and the fluid velocity.
With this technology, fouling or clogging of heat exchangers can be prevented or minimized. The fluidized bed effectively handles many types of fouling including scaling, whether hard or soft, originating from biological, crystallization, chemical or particulate fouling mechanism, or a combination of these. A wide variety of fluids can be handled ranging from aqueous solutions to oils and slurries.
Watch the video presentation about our innovative technology and the process of cleaning the heat exchanger tubes.
The self-cleaning fluidized bed heat exchanger technology has been successfully applied in Multi-Effect Evaporators and will be applied in MVR Evaporators as well. The technology has proven to be able to eliminate (severe) fouling in evaporators and ensures constant evaporation capacity and longer operational time.
In this webinar it is explained how the self-cleaning technology can be implemented in MEE (single effect/multi-effect/TVR) as well as MVR.
The following topics are addressed:
In a self-cleaning heat exchanger the tubes remain clean and therefore the heat transfer can kept constant which improves the energy performance:
A self-cleaning heat exchanger needs not to be taken out of production for cleaning, therefore the capacity remains constant and in some cases the production yield can be increased, which enhances the productivity:
When using the self-cleaning heat exchanger technology chemicals are not required as online additives or needed for cleaning purposes. Therefore, there are no hazardous waste streams from cleaning which makes the heat exchanger more sustainable:
Because of a constant heat transfer in the self-cleaning heat exchanger, over dimensioning of the heat transfer surface is not required which results in a more compact design of the heat exchanger: