Burner

Abstract

A burner for introducing solid particulate fuel to a burning zone of a kiln such as a rotary kiln for manufacturing cement clinker or similar material includes a centrally located duct for conducting solid fuel to an inlet opening and at least one duct for conducting primary air to one or more annular nozzles surrounding the inlet opening of the centrally located duct. The centrally located duct for conducting solid fuel is arranged so that the direction of introduction of the fuel relative to the longitudinal axis of the burner and consequently the direction of introduction of the primary air may be adjusted continuously during operation of the burner.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is the United States national stage under 35 U.S.C. §371 of International Application No. PCT / IB2010 / 051800, filed on Apr. 23, 2010, which claimed priority to Danish Patent Application No. PA 2009 00528, filed on Apr. 24, 2009. The entirety of these applications is incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates to a burner for introducing solid particulate fuel to a burning zone of a kiln such as a rotary kiln for manufacturing cement clinker or similar type of material. In some embodiments, the burner may comprise a centrally located duct for conducting solid fuel to an inlet opening and at least one duct for conducting primary air to one or more annular nozzles surrounding the inlet opening of the centrally located duct.BACKGROUND OF THE INVENTION[0003]Burners used to introduce solid particulate fuel to a burning zone of a kiln are well-known. Normally, the central duct for con...

AI Technical Summary

Benefits of technology

The present invention provides a burner with which the direction of introduction of solid fuel and primary air can be adjusted continuously during operation. This allows for the use of different types of solid particulate fuels and mixtures thereof via one and same duct to the burning zone of a kiln, reducing transport air and cost of the burner. The burner includes a centrally located duct for conducting solid fuel which can be adjusted in direction to optimize the introduction of the fuel. The duct can be connected to a mechanism for rotating the duct up and down in a vertical plane, allowing for the adjustment of the fuel direction. The burner can also include additional ducts for the introduction of other types of fuel, such as oil and gas.

Problems solved by technology

The disadvantage of a burner with several ducts for the introduction of solid fuels is the fact that the quantity of transport air is increased as the number of ducts increase, and the quantity of transport air is therefore relatively large, which is undesirable as it increases both fuel requirements and the cost of the burner as the number of ducts increase.

Therefore none of the known burners are configured optimally as regards the operational as well as the financial aspects when they are intended for the introduction of various types of solid particulate fuels.

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