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| Figure 1: Installations equipped with self-cleaning heat exchangers. |
Operating installations
Total number of self-cleaning heat exchangers designed, installed and put into operation under the supervision of Dr. Ir. Dick Klaren, the President of KLAREN BV, amounts to more than 80, totaling over 10,000 m² heat transfer surface.
Treatable fouling services.
Fouling services which can be treated with the KLAREN self-cleaning exchangers are the following:
- Forced circulation evaporators and reboilers.
- Chemical processes where heating and cooling causes polymerization fouling or resinous deposits.
- Heat recovery from hard scaling and/or biologically fouled waste waters.
- Concentration of waste waters by evaporation.
- Cooling and evaporative cooling crystallization.
- White-water and black-liquor heating in pulp and paper industries.
- Heating of slurries in mining industries.
- Raw juice heating in food processing.
- District heating and/or power generation with geothermal brines.
- Brackish water and seawater desalination.
- Production of medium and high pressure steam from severely fouling chemically untreated waters.
- Self-cleaning lube oil chillers to replace scraped surfaces.
- Crude oil preheater.
The demand for self-cleaning heat exchangers is increasing. Figure 1 gives an impression of a number of installations equipped with self-cleaning heat exchangers. Amongst them:
- A Multi-Stage-Flash (MSF) seawater desalination plant in the Netherlands for a production of 500 ton/day and heating raw chemically untreated seawater to a maximum temperature of 115 °C.
- A forced circulation evaporator for a food processing plant in Japan. Conventional exchangers were never considered because the severely fouling liquid would cause blockage in just a few hours.
- A forced circulation evaporator for the concentration of waste water from Medium Density Fiberboard (MDF) plant in Belgium, while producing steam of 200 °C and 14 barg. The steam is used in the process for the preheating of wood chips. At this high temperature level, the concentration of this waste water by evaporation would cause severe fouling in any conventional heat exchanger.
- A couple of test installations which have been used in the Netherlands, United States, Australia and Saudi Arabia.
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| Figure 1: Installations equipped with self-cleaning heat exchangers. |
