Sistema De Inyeccion De Aceite

REVISTA DE METALURGIA, 45 (2) MARZO-ABRIL, 100-113, 2009 ISSN: 0034-8570 eISSN: 1988-4222 doi: 10.3989/revmetalm.0769

Com bus ti on o f was t e o ils s imu lat in g th eir in jec t io n in blas t f u rn ac e t u y er es (•)
A. Cores*, S. Ferreira*, A. Isidro* and M. Muñiz**
A b s t r ac t
A study has been made of the combustion of different waste oils produced in an iron and steel works.Combustion is achieved by injecting the waste oil at flows of 10-20 kg/h in a combustion chamber that simulates the conditions of the blast furnace tuyere zone. The waste oil is preheated to 65-90 °C in order to achieve conditions of fluidity and is injected by spraying into the combustion chamber. During combustion the temperatures and the CO2, O2, CO N2 and H2 contents of the gases in thecombustion chamber are constantly recorded. The efficiency of the combustion of each waste oil is determined. Blast furnace; Waste oils; Waste oils combustion; Waste oils injection.

K ey w o rd s

Co m b u s t i ó n d e ac ei t es r es i d u al es s i m u l an d o s u i n y ec c i o n en l as t o b er as d el h o r n o al t o
Res u m en
Se realiza un estudio de la combustión de diferentes aceitesresiduales que se producen en las plantas siderúrgicas. La combustión se consigue al inyectar el aceite residual, con caudales de 10-20 kg/h, en una cámara de combustión que simula las condiciones del horno alto en la zona de toberas. El aceite residual se precalienta a 65-90 °C para conseguir las condiciones de fluidez y se inyecta en la cámara de combustión. Durante la combustión, se registran demodo continuo las temperaturas y los contenidos de CO2, O2, CO, N2 y H2 en los gases de la cámara de combustión. Se calcula la eficiencia de la combustión de cada aceite residual. Horno alto; Aceites residuales; Combustión de aceites residuales; Inyección de aceites residuales.

Pal ab r as cl av e

1. INTRODUCTION
Finding suitable ways of disposing of hazardous industrial wastes whilepreserving human health and the environment is a relatively recent concern in industrialised countries. The dramatic rise in environmental contamination and the worldwide repercussions of some widely publicised events have led to an increase in public awareness of this problem. Since the 1970s governments and public opinion have started to pay attention to the environmental consequences of theinadequate disposal or treatment of this type of waste. Between 1973 and 2012 six EC environmental programmes issued directives designed to prevent damage to the environment caused by the uncontrolled elimination of waste oils and the guarantee the
(•)

safe disposal and recycling of wastes. These programmes are showed in Appendix 1. Iron and steel works, and particularly their rolling mills, producelarge amounts of waste oils that must be eliminated by incineration or by other means, as their dumping is prohibited[1]. The company Cockerill Sambre injects in the tuyeres of its Liege BF, at a rate of up to 600 l/h per tuyere, a waste of which after purification treatment has reduced its water content to 2% and possesses a calorific capacity of 42,500 kJ/kg. During the years 1991 and 1992,respectively, 3,900 and 3,700 t of waste oil were injected into the furnace. Given that the waste oil was almost free of water, no problems were detected. Less purified waste oils, with a water content of 35 to 60%, are injected into the tuyeres of BF 4 and BF 5 at Charleroi at a rate of 500

Trabajo recibido el día 18 de diciembre de 2007 y aceptado en su forma final el día 15 de octubre de 2008. *Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC). Avda. Gregorio del Amo, 8; 28040 Madrid, Spain. ** ARCELOR Corporación Siderúrgica. Ap. 570, 33280, Gijón, Spain.

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COMBUSTION OF WASTE OILS SIMULATING THEIR INJECTION IN BLAST FURNACE TUYERES COMBUSTIÓN DE ACEITES RESIDUALES SIMULANDO SU INYECCION EN LAS TOBERAS DEL HORNO ALTO

t/year per furnace. This impure oil causes...