Suspension smelting furnace and a concentrate burner

Abstract

The invention relates to a suspension smelting furnace comprising a reaction shaft (1), an uptake shaft (2), and a lower furnace (3), as well as a concentrate burner (4) for feeding reaction gas and fine solids into the reaction shaft (1) of the suspension smelting furnace. The concentrate burner (4) comprises a fine solids discharge channel (5) that is radially limited by the wall (6) of the solids discharge channel, a fine solids dispersion device (7) in the fine solids discharge channel (5), an annular reaction gas channel (8) that surrounds the fine solids discharge channel (5) and is radially limited by the wall (9) of the annular reaction gas channel (8), and a cooling block (10) that surrounds the annular reaction gas channel (8). The cooling block (10) is a component that is manufactured by a continuous casting method. The cooling block (10) is attached to the arch (11) of the reaction shaft (1) and the wall (9) of the annular reaction gas channel (8), so that the discharge orifice (12) of the annular reaction gas channel (8) is formed between a structure (13), which is jointly formed by the cooling block (10) and the wall (9) of the annular reaction gas channel (8), and the wall (6) of the solids discharge channel. The invention also relates to a concentrate burner (4) for feeding reaction gas and fine solids into the reaction shaft (1) of a suspension smelting furnace.

Claims

1. A suspension smelting furnace comprising a reaction shaft, an uptake shaft, and a lower furnace, as well as a concentrate burner for feeding of reaction gas and fine solids into the reaction shaft of the suspension smelting furnace, the concentrate burner comprising a fine solids discharge channel that is radially limited by the wall of the fine solids discharge channel; a fine solids dispersion device in the fine solids discharge channel; an annular reaction gas channel that surrounds the fine solids discharge channel and that is radially limited by the wall of the annular reaction gas channel; and a cooling block that surrounds the annular reaction gas channel, wherein the cooling block is a component that is manufactured using a continuous casting method; wherein the cooling block is attached to the arch of the reaction shaft and to the wall of the annular reaction gas channel, so that the discharge orifice of the annular reaction gas channel is formed between a structure, which is jointly formed by the cooling block and the wall of the annular reaction gas channel, and the wall of the fine solids discharge channel, so that the discharge orifice of the annular reaction gas channel is radially outwardly limited by the structure, which is jointly formed by the cooling block and the wall of the annular reaction gas channel, and so that the discharge orifice of the annular reaction gas channel is radially inwardly limited by the wall of the fine solids discharge channel; and the cooling block is provided with through openings for a feed-though for an attached outgrowth removal system, said outgrowth removal system structurally connected to said through openings for removing outgrowth from the cooling block, wherein the cooling block comprises channels for the purpose of circulating cooling fluid in the cooling block, and wherein the through openings are not connected to the channels for the purpose of circulating cooling fluid in the cooling block.

2. The suspension smelting furnace according to claim 1, wherein the wall of the fine solids discharge channel comprises a first curved portion on the side of the annular reaction gas channel, and wherein the first curved portion is adapted to have congruence with and therefore cooperatively work with a second curved portion of the structure on the side of the reaction gas channel, which structure is jointly formed by the cooling block and the wall of the reaction gas channel, so that the flow cross-sectional area of the reaction gas channel decreases in the flow direction of the reaction gas between the first curved portion and the second curved portion.

3. The suspension smelting furnace according to claim 1, wherein the fine solids discharge channel is vertically movable, so that the size of the flow cross-sectional area of the discharge orifice of the annular reaction gas channel changes.

4. The suspension smelting furnace according to claim 1, wherein the cooling block is at least partly manufactured of copper or a copper alloy.

5. A concentrate burner for feeding reaction gas and fine solids into the reaction shaft of a suspension smelting furnace, comprising a fine solids discharge channel that is radially limited by the wall of the fine solids discharge channel; a fine solids dispersion device in the fine solids discharge channel; an annular reaction gas channel that surrounds the fine solids discharge channel and that is radially limited by the wall of the annular reaction gas channel; a cooling block that surrounds the annular reaction gas channel; wherein the cooling block is a component that is manufactured by a continuous casting method; wherein the cooling block is attached to the wall of the annular reaction gas channel, so that the discharge orifice of the annular reaction gas channel is formed between a structure, which is jointly formed by the cooling block and the wall of the annular reaction gas channel, and the wall of the fine solids discharge channel, so that the discharge orifice of the annular reaction gas channel is radially outwardly limited by the structure, which is jointly formed by the cooling block and the wall of the annular reaction gas channel, and so that the discharge orifice of the annular reaction gas channel is radially inwardly limited by the wall of the fine solids discharge channel; and wherein the cooling block is provided with through openings for a feed-though for an attached outgrowth removal system, said outgrowth removal system structurally connected to said through openings for removing outgrowth from the cooling block, wherein the cooling block comprises channels for a cooling fluid, and wherein the through openings are not connected to the channels for the purpose of circulating cooling fluid in the cooling block.

6. The concentrate burner according to claim 5, wherein the wall of the fine solids discharge channel comprises a first curved portion on the side of the annular reaction gas channel, and wherein the first curved portion is adapted to have congruence with and therefore cooperatively work with a second curved portion of the structure on the side of the reaction gas channel, which structure is jointly formed by the cooling block and the wall of the annular reaction gas channel, so that the flow cross-sectional area of the annular reaction gas channel decreases in the flow direction of the reaction gas between the first curved portion and the second curved portion.

7. The concentrate burner according to claim 5, wherein the fine solids discharge channel is vertically movable, so that the size of the flow cross-sectional area of the discharge orifice of the annular reaction gas channel changes.

8. The concentrate burner according to claim 5, wherein the cooling block is at least partly manufactured of copper or a copper alloy.

Description

LIST OF FIGURES

(1) In the following, some preferred embodiments of the invention are described in detail with reference to the appended figures, wherein

(2) FIG. 1 shows the suspension smelting furnace;

(3) FIG. 2 shows a vertical section of one preferred embodiment of the concentrate burner in a state, where the concentrate burner is installed in the reaction shaft of a suspension smelting furnace; and

(4) FIG. 3 shows a cooling block from above.

DETAILED DESCRIPTION OF THE INVENTION

(5) The invention relates to the suspension smelting furnace and the concentrate burner.

(6) First, the suspension smelting furnace and some of its preferred embodiments and variations are described in more detail.

(7) FIG. 1 shows a suspension smelting furnace which comprises a reaction shaft 1, an uptake shaft 2, and a lower furnace 3, as well as a concentrate burner 4 for feeding reaction gas (not shown in the figures) and fine solids (not shown) into the reaction shaft 1. The operation of such a suspension smelting furnace is described in the Finnish patent FI22694, for example.

(8) The concentrate burner 4 comprises a fine solids discharge channel 5, which is radially, that is outwardly limited by the wall 6 of the fine solids discharge channel 5.

(9) The concentrate burner 4 comprises a fine solids dispersion device 7 in the fine solids discharge channel 5.

(10) The concentrate burner 4 comprises an annular reaction gas channel 8, which surrounds the fine solids discharge channel 5 and which is radially limited by the wall 9 of the annular reaction gas channel 8.

(11) The concentrate burner 4 comprises a cooling block 10 that surrounds the annular reaction gas channel 8.

(12) The operation of such a concentrate burner 4 is described in the publication WO 98/14741, for example.

(13) The cooling block 10 is a component that is manufactured using a continuous casting method.

(14) The cooling block 10 is attached to the arch 11 of the reaction shaft 1 and to the wall 9 of the annular reaction gas channel 8, so that the discharge orifice 12 of the annular reaction gas channel 8 is formed between a structure 13, which is jointly formed by the cooling block 10 and the wall 9 of the annular reaction gas channel 8, and the wall 6 of the fine solids discharge channel 5.

(15) The wall 6 of the fine solids discharge channel 5 preferably, but not necessarily, comprises a first curved portion 14 on the side of the annular reaction gas channel 8, which is adapted so as to work in cooperation with the second curved portion 15 of the structure 13 on the side of the annular reaction gas channel 8, which structure 13 is jointly formed by the cooling block 10 and the wall 9 of the annular reaction gas channel 8, so that the flow cross-sectional area of the annular reaction gas channel 8 decreases in the flow direction of the reaction gas between the first curved portion 14 and the second curved portion 15.

(16) The wall 6 of the fine solids discharge channel and the structure 13 that is jointly formed by the cooling block 10 and the wall 9 of the reaction gas channel are preferably, but not necessarily, vertically movable with respect to each other, so that the size of the flow cross-sectional area of the discharge orifice 12 of the annular reaction gas channel 8 changes. For example, it is possible to vertically move the wall 6 of the fine solids discharge channel, so that the size of the flow cross-sectional area of the discharge orifice 12 of the reaction gas channel changes.

(17) The annular reaction gas channel 8 can be provided with adjustable or fixed swirl vanes (not shown in the figures).

(18) The cooling block 10 preferably, but not necessarily comprises channels 17, such as drilled channels for the purpose of circulating cooling fluid (not shown) in the cooling block 10.

(19) The cooling block 10 is preferably, but not necessarily, provided with openings 16 for the feed-through of an outgrowth removal system (not shown).

(20) The cooling block 10 is preferably, but not necessarily, at least partly manufactured of copper or a copper alloy.

(21) The invention also relates to a concentrate burner 4 for feeding reaction gas and fine solids into the reaction shaft 1 of the suspension smelting furnace.

(22) The concentrate burner 4 comprises a fine solids discharge channel 5, which is radially, that is outwardly limited by the wall 6 of the fine solids discharge channel 5.

(23) The concentrate burner 4 comprises a fine solids dispersion device 7 in the fine solids discharge channel 5.

(24) The concentrate burner 4 comprises an annular reaction gas channel 8, which surrounds the fine solids discharge channel 5 and which is radially, that is outwardly, limited by the wall 9 of the annular reaction gas channel 8.

(25) The concentrate burner 4 comprises a cooling block 10 that surrounds the annular reaction gas channel 8.

(26) The operation of such a concentrate burner 4 is described in the publication WO 98/14741, for example.

(27) In the concentrate burner 4, the cooling block 10 is a component that is manufactured by the continuous casting method.

(28) The cooling block 10 is attached to the wall 9 of the annular reaction gas channel 8, so that the discharge orifice 12 of the annular reaction gas channel 8 is formed between the structure 13, which is jointly formed by the cooling block 10 and the wall 9 of the annular reaction gas channel 8, and the wall 6 of the fine solids discharge channel 5.

(29) The wall 6 of the fine solids discharge channel 5 preferably, but not necessarily, comprises a first curved portion 14 on the side of the annular reaction gas channel 8, which is adapted so as to work in cooperation with the second curved portion 15 of the structure 13 on the side of the annular reaction gas channel 8, which structure 13 is jointly formed by the cooling block 10 and the wall 9 of the annular reaction gas channel 8, so that the flow cross-sectional area of the annular reaction gas channel 8 decreases in the flow direction of the reaction gas between the first curved portion 14 and the second curved portion 15.

(30) The wall 6 of the fine solids discharge channel 5 and the structure 13 that is jointly formed by the cooling block 10 and the wall 9 of the annular reaction gas channel 8 are preferably, but not necessarily, vertically movable with respect to each other, so that the size of the flow cross-sectional area of the annular reaction gas channel 8 discharge orifice 12 changes. For example, it is possible that the wall 6 of the fine solids discharge channel 5 is vertically movable, so that the size of the flow cross-sectional area of the discharge orifice 12 of the annular reaction gas channel 8 changes.

(31) The annular reaction gas channel 8 can be provided with adjustable or fixed swirl vanes (not shown in the figures).

(32) The cooling block 10 preferably, but not necessarily, comprises channels 17, such as drilled channels for the purpose of circulating cooling fluid (not shown) in the cooling block 10.

(33) The cooling block 10 is preferably, but not necessarily, provided with openings 16 for the feed-through the outgrowth removal system (not shown).

(34) The cooling block 10 is preferably, but not necessarily, at least partly manufactured of copper or a copper alloy.

(35) It is obvious to those skilled in the art that with the technology improving, the basic idea of the invention can be implemented in various ways. Thus, the invention and its embodiments are not limited to the examples described above but they may vary within the claims.