| 摘要 |
A burner for feeding solid and liquid or gaseous fuel into a burning zone of a kiln, for instance a rotary kiln, and comprising a central duct for liquid or gaseous fuel, a surrounding annular duct for primary air and a further surrounding annular duct for solid fuel is provided with an outer duct system for feeding yet an additional amount of primary air into the burning zone, the duct system being in the form of a heat exchanger for transferring heat from the inner kiln compartment surrounding the burner to the primary air transported in the duct system, to thereby increase the velocity of the air passing through the system without any corresponding increase in fan power or energy consumption of the kiln plant, but with a substantial decrease in the amount of primary air fed to the burning zone. The duct system is separated from the remaining parts of the burner by an insulating layer. PAT 16380-1
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