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Content archived on 2024-04-19

Improved efficiency drying using selective emittancy radiant burners


Development of advanced radiant burners for drying purposes with at least 20% higher efficiency than present infrared (IR) drying systems. Enhanced radiant heat transfer is achieved by using new coating materials with selective radiating properties. This technology will lead to faster drying compared to conventional methods resulting in significant energy savings. The study intends to prove the principle by modelling and experimental validation.

Several (two at most) base-solvents will be selected. These have to be components which should be removed from solids (for example textile, paint, paper, food) in drying processes where gas-fired infrared generators are or can be used. These solvents are chosen to prove the principle of increased efficiency by spectral matching emission with absorption of the load. Existing commercially available infrared heaters will be selected as a reference. In this phase, a laboratory test facility will be designed. Suitable materials will be selected and coated on an ECN radiant ceramic foam burner. This burner has been developed at ECN for the last few years and its properties (flame stability, radiation, pressure drop, thermal stability, mechanical strength) are well known at ECN. Research will be necessary in order to apply the selected coating materials in a way that thermal stability is sufficiently high. The 30 kW laboratory test facility, designed in an earlier stage, will be built. The newly developed selective-emittance burners as well as the uncoated version will be tested in the 30 kW laboratory test facility to measure increased drying rate for the selected base solvents. The same solvents will be dried under identical conditions by selected commercially available infrared heaters. The results will quantify the performance gains (increased drying rate) possible by selective-emittance burner technology. A burner model will describe burner performance resulting in data of spectral radiant output for various coatings. Detailed overall modelling of radiation heat transfer in drying processes will predict drying efficiency using spectral input data of load, burner (obtained from burner model) and furnace walls. The overall model will be validated using experimental data obtained in the test facility with the selected base solvents.

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Westerduinweg 3

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