The invention relates to particular burners, and e.g. to a burner comprising a central main fuel lance, a
pilot fuel conduit, a main oxidant conduit, an auxiliary oxidant conduit, and optionally a secondary fuel conduit, which are arranged in a particular and advantageous way to surround each other at least in their downstream sections. The invention further relates to furnaces including the burners and methods of operating the burners. Among others, the burners of the present invention allow a particularly advantageous way of including a
pilot burner as an integral part of the main burner to ignite
liquid fuel flame in a cold furnace. If required, the
pilot flame can assist in extending the
flammability limit or operating range of the
liquid fuel burner.