| OCR Text |
Show Previously if an operator has used pulverised fuel in his process, the ability to increase throughput or reduce fuel costs through oxy-fuel firing has not been an option, unless gaseous or liquid fuels were available. Now, any process that burns pulverised fuel can be enhanced and given added flexibility by the use of oxygen-pulverised fuel burners. Many arc furnace operators already using pulverised coal could take advantage of lower cost pulverised fuel and replace oxygen-gas burners with oxygen-pulverised fuel burners. Air-pulverised fuel flames are relatively unstable, particularly at the low temperatures encountered during start up periods, and are often stabilised - especially in the power generation industry - by the introduction of an oil lance. This is a relatively expensive method of flame stabilisation and is the predominant cause of visible stack emissions on station start up. Trials have shown that the use of oxygen in conjunction with pulverised fuel, whether in the form of oxygen-pulverised fuel burners or oxygen enrichment will stabilise the flame without the need for oil. Oxygen-pulverised fuel burners could be used for power station start up burning stoichiometrically and giving off no visible emissions. As mentioned earlier, the opportunity for lower HOX emissions is also available. In all industries using pulverised fuel there is the option to increase the content of lower grade fuels and at the same time gain operational flexibility using oxygen-pulverised fuel burners. A benefit that until now has not been available. Page 9 |
