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2017-04-18 - Colloque/Article dans les actes avec comité de lecture - Anglais - 12 page(s)

Mosca Gabriele , Lupant Delphine , Lybaert Paul , "Effect of increasing load on the MILD combustion of COG and its blend with BFG in a 30 kW furnace using low air preheating temperature" in 11th european conference on industrial furnaces and boilers (INFUB-11), Albufeira, Portugal, 2017

  • Codes CREF : Recherche énergétique (DI2290), Transfert de chaleur (DI2211), Combustion (DI2212)
  • Unités de recherche UMONS : Thermique et Combustion (F704)
  • Instituts UMONS : Institut de Recherche en Energétique (Energie)

Abstract(s) :

(Anglais) Coke oven gas (COG) and a particular blend (B50), obtained by mixing 50% of COG with 50% of blast furnace gas (BFG), have been tested in MILD combustion regime using a low air preheating temperature at 673 K. Experimental tests have been performed on a 30 kW chamber designed to reproduce the main features of industrial furnaces. The load is represented by 4 water cooled tubes (WCT) positioned at the corner of the combustion chamber. The main purpose of the campaign was the investigation of the behaviour of the two fuels rich in H2 in MILD regime for different heat transfer conditions to the load, using an air preheating temperature which can be assured by low performance heat exchanger too. During the tests the immersion of WCT has been increased from the top of the furnace down to the deepest level which still guaranteed a proper combustion. Temperatures, flow rates, power balances, efficiencies, and flue gases content have been constantly monitored. Images from the chemiluminescent emission of OH* has also been taken through an optical access by an UV camera in order to visualize the position of main reaction zones. Flue gases temperature has a range from 1215 K to 1300 K and mean wall temperature obtained through 8 thermocouples positioned along the chamber height from 960 K to 1200 K. In general, for these measures the temperature difference between COG and B50 is 45 K and 30 K respectively. The homogeneous mixing conditions reached in the MILD combustion regime and the consequent low temperature field guaranteed very low polluting emissions: NOx is below the 7 ppm and CO below the 40 ppm. Both fuels have very good performance for increased heat transfer to the load. However, COG has shown higher combustion efficiency and higher capability to keep a well-positioned reaction zone for the deepest immersion of WCT thanks to its higher H2 content able to reduce the ignition delays.