Burner and fine solids feeding apparatus for a burner
Provided are a burner such as a concentrate burner, a calcine burner, or a matte burner, or a burner using a mixture of these for feeding reaction gas and fine solids into a reaction shaft of a suspension smelting furnace, and a fine solids feeding apparatus for a burner such as a concentrate burner, a calcine burner, or a matte burner, or a burner using a mixture of these. The fine solids feeding apparatus comprises gas outlets in a fine solids discharge channel upstream of a downstream outlet end of the fine solids discharge channel. The gas outlets comprise spiral path guiding members configured to facilitate gas to flow from the gas outlets in a spiral flow path around a center axis A of the fine solids discharge channel.
1. A fine solids feeding apparatus for a burner, wherein the fine solids feeding apparatus comprises:
a fine solids discharge channel that is radially outwardly limited by a fine solids discharge channel wall of the fine solids discharge channel and that is radially inwardly limited by a fine solids dispersion device arranged in the fine solids discharge channel so that the fine solids discharge channel has an annular cross-section,
wherein the fine solids dispersion device has dispersion gas openings and a dispersion gas channel for conducting dispersion gas to the dispersion gas openings,
wherein the fine solids dispersion device extends out of a downstream outlet end of the fine solids discharge channel, and
wherein the fine solids dispersion device has at the downstream outlet end of the fine solids discharge channel an enlarged section, where the diameter of the fine solids dispersion device increases in the direction towards a free distal end of the fine solids dispersion device,
wherein the fine solids feeding apparatus further comprises:
gas outlets in the fine solids discharge channel upstream of the downstream outlet end of the fine solids discharge channel,
wherein the gas outlets comprise spiral path guiding members configured to facilitate gas to flow from the gas outlets in a spiral flow path around a center axis A of the fine solids discharge channel,
partition walls in the fine solids discharge channel upstream of the gas outlets in the fine solids discharge channel,
wherein the partition walls divide the fine solids discharge channel into sectors,
wherein the partition walls are planar and extend in the direction of the center axis A of the fine solids discharge channel, and
wherein a distance between the partition walls and the downstream outlet end of the fine solids discharge channel is between 0.1 and 1.5 m.
2. The fine solids feeding apparatus according to claim 1 , comprising an annular gas channel surrounding the dispersion gas channel of the fine solids dispersion device.
3. The fine solids feeding apparatus according to claim 2 , wherein the annular gas channel is arranged in the fine solids discharge channel.
4. The fine solids feeding apparatus according to claim 3 , wherein the annular gas channel is arranged at the fine solids dispersion device.
5. The fine solids feeding apparatus according to claim 3 , wherein the annular gas channel is arranged at the fine solids discharge channel wall of the fine solids discharge channel.
6. The fine solids feeding apparatus according to claim 3 , wherein the annular gas channel is provided at a distance from the fine solids discharge channel wall and at a distance from the fine solids dispersion device.
7. The fine solids feeding apparatus according to claim 2 , wherein the annular gas channel is provided in the fine solids dispersion device.
8. The fine solids feeding apparatus according to claim 2 , wherein the annular gas channel is provided in the fine solids discharge channel wall of the fine solids discharge channel.
9. The fine solids feeding apparatus according to claim 1 , wherein the dispersion gas openings are arranged in the fine solids discharge channel upstream of the enlarged section of the fine solids dispersion device.
10. The fine solids feed apparatus according to claim 1 , wherein the burner is selected from the group consisting of a concentrate burner, a calcine burner, a matte burner, and mixtures thereof.
11. A burner comprising a fine solids feeding apparatus according to claim 1 .