Objectif To boost the operating temperature from 550 Deg. C to 700-750 Deg. Cof a 50,000 T/y hot blast cupola plant making pig iron from ferrous scraps.The objective of the project was to operate the plant at temperatures higher then those at which it normally operated. Performance monitoring from mid-1980 to the end of 1981 revealed engineering problems. One valve was destroyed by water problems, the second became distorted by heat blast to 680 deg. C. A combination of hot blast and temperature broke down the booster's internal refractory bricks with 80% having to be replaced. Higher than planned temperatures were used to maintain combustion gas quality: supplementary materials to be used in the charge, including rubber tyres and coking coal briquettes. problems also occured inducting insulation and jointing. The main results declared up to the end of 1980 are:. historic windbelt temperature was 530 deg. C: experimental runs gave improved temperatures of 730 deg. C, 660 deg. C and 720 deg. C. And, at the time of closure temperatures of 750 deg. C were typical;. based on data collected to the end of 1980 coke use declined by 9.2% including added combustible material and booster burner consumption, implying a 40,000 T/y output (L90,398/y) at the end of 1980;. oxgen use fell by 17,4%, a saving of L14,396/y based on the above figures.The project involves the mixing of stack gases at 1,100 Deg. C with air recovered at 550 Deg. C from a recuperator to inject air at 700 Deg. C into 2 cupolas.A booster recuperator was introduced to the plant which consisted of:. primary air heater;. recuperator;. two cupolas.The booster recuperator was introduced to mix stack gas leaving the primary air heater at 1,00 Deg. C with air leaving the recuperator at 550 Deg. C. This involved diverting stack gas into the new equipment and ducting from the recuperator to the new equipment (for recuperator air) and ducting the resulting mix from the booster to the air injection system in the cupolas. The main elements required were:. a stainless steel flap type valve, cooled by a water sleeve;. the booster recuperator;. ducting from the main recuperator to the booster recuperator and from there to the cupolas.In effect the booster recuperator is a refractory lined burner fired oven. Gas passes through a series of refractory baffles to effect a mix between recovery stack gas and primary heated gas.Provisional work on Supplementary Materials. This work showed that :. Silicon Recovery from Ferro Silicon Additions (75 % Si) improved by approxymately 10 % showing a saving of approximately 0.2 % Silicon level. At the current price in 1980 of UKL350 per tonne of 75 % Fe Si, a saving of UKL0.93 per tonne of iron produced.. Experimental Trial were carried out at 700 deg. and Silicon Recoveries were cocompared with experimental trials carried out at 550 deg. Programme(s) ENG-ENALT 1C - Programme (EEC) of financial support for projects to exploit alternative energy sources, 1979-1984 Thème(s) 1.6 - INDUSTRY Appel à propositions Data not available Régime de financement DEM - Demonstration contracts Coordinateur Bradley and Foster Ltd Contribution de l’UE Aucune donnée Adresse Heath Road WS10 8JL Wednesbury Royaume-Uni Voir sur la carte Coût total Aucune donnée
