Vector deployment and control rotary floating nozzle and working method thereof

Abstract

The invention discloses a vector deployment and control rotary floating nozzle and a working method thereof. The nozzle comprises an inner interlayer core cylinder part and an outer interlayer sleeve part. The inner interlayer core cylinder part sequentially comprises a natural gas channel, an air channel and an oxygen-enriched channel from inside to outside; the outer interlayer sleeve part sequentially comprises a mineral aggregate channel and a rotary air channel from inside to outside; an opening adjusting valve is arranged at an inlet in the upper end of the oxygen-enriched channel, so that a process oxygen-enriched air speed adjusting function is realized; a vector annular grating is arranged at the lower end of the mineral aggregate channel and comprises double concentric annular frameworks, and a plurality of vector grating plates distributed in a circumferential array mode are arranged between the double concentric annular frameworks. The vector grating plate is a three-dimensional modeling blade which is formed after being processed by a twisting process, and has a flow guide effect on vertically downward mineral aggregate in two directions of centripetal gathering and tangential rotational flow, so that the uniformity of material distribution is improved, meanwhile, it is guaranteed that gas-particle two-phase flow makes full contact with process oxygen-enriched air, and the combustion efficiency is improved.

Description

Technical Field

[0001] The invention relates to a vector-controlled swirl-float nozzle and a working method thereof, belonging to the technical field of swirl-float nozzles. Background Art

[0002] The rotary flotation nozzle is the core equipment of rotary flotation smelting. The ore powder and process oxygen-enriched air enter the reaction tower space through the material channel and air duct of the rotary flotation nozzle respectively, forming an inverted tornado-shaped gas-particle two-phase flow in the reaction tower. In the high heat load environment of the reaction tower, the ore powder and oxygen fully collide, a smelting reaction occurs, and molten droplets are generated, which fall into the sedimentation tank and are separated by sedimentation to obtain the product. Therefore, the performance of the rotary flotation nozzle is directly related to whether the rotary flotation smelting process can proceed smoothly and the quality of technical and economic indicators.

[0003] The core of flotation smelting is that after the mixed oxygen air and the material pass through the flotation nozzle, they fully collide and contact in the reaction tower to react. When the process oxygen-enriched air swirl is insufficient and the diffusion angle is small, incomplete reaction is likely to occur. However, excessive diffusion of the reaction will wash the wall of the reaction tower, causing erosion of the furnace lining and affecting the safety of the furnace body. The current flotation nozzle does not have the ability to adjust the process oxygen-enriched air flow rate and material distribution method. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a vector-controlled rotary floating nozzle and a working method thereof.

[0005] The technical solution of the present invention is as follows: A vector controlled swirl floating nozzle comprises an inner sandwich core barrel portion responsible for gas mixing and an outer sandwich sleeve portion responsible for gas-particle mixing; the inner sandwich core barrel portion comprises a natural gas channel, an air channel and an oxygen-enriched channel in sequence from the inside to the outside; the outer sandwich sleeve portion comprises a mineral material channel and a swirl wind channel in sequence from the inside to the outside; The upper inlet of the oxygen-enriched channel is provided with an opening regulating valve; A vector annular grille is arranged at the lower end of the mineral material channel, and the vector annular grille includes a double concentric circular ring skeleton, and a plurality of vector grille plates distributed in a circumferential array are arranged between the double concentric circular ring skeletons. The vector grille plates are three-dimensional blades formed by a twisting process, and have the function of guiding the mineral materials flowing vertically downward in two directions: centripetal gathering and tangential swirl.

[0006] As a preferred solution, the upper ends of the natural gas channel, air channel, oxygen-enriched channel, mineral channel and rotating wind channel are respectively provided with mutually independent natural gas inlet, air inlet, oxygen-enriched inlet, mineral inlet and rotating wind inlet, and the heights of the natural gas inlet, air inlet, oxygen-enriched inlet, mineral inlet and rotating wind inlet decrease step by step from the inside to the outside; the lower ends of the natural gas channel, air channel, oxygen-enriched channel, mineral channel and rotating wind channel are connected and converged.

[0007] As a preferred solution, the oxygen-enriched inlet, the mineral material inlet and the rotating wind inlet are respectively provided with two axially symmetrically distributed inlets, and the directions thereof are tangent to the outer walls of the oxygen-enriched channel, the mineral material channel and the rotating wind channel respectively.

[0008] As a preferred solution, the two oxygen-enriched inlets are respectively provided with the opening regulating valve.

[0009] As a preferred solution, a fluidizer is respectively provided below the two mineral material inlets.

[0010] As a preferred solution, a cooling water jacket is provided at the lower end of the outer wall of the outer interlayer sleeve portion.

[0011] As a preferred solution, the inclination angle of the vector grating plate in the tangential swirl direction is °.

[0012] A method for operating a vector-controlled rotary floating nozzle, comprising the vector-controlled rotary floating nozzle as described above, comprises the following working steps: 1. Gas and mixed oxygen air are introduced into the natural gas channel, air channel and oxygen-enriched channel respectively, and ignited at the lower end of the nozzle to form a jet flame; 2. The dried concentrate enters the material channel. The fluidized air in the fluidizer blows up the concentrate and disperses it, and then it falls into the material channel. The concentrate is evenly distributed along the circumference of the annular cross section of the material channel. 3. A high-pressure airflow is introduced into the upper end of the rotating wind channel, and a swirling wind is formed in the rotating wind channel. The concentrate falling from the ore channel first forms a uniformly distributed ore flow under the tangential swirling flow guidance of the vector annular grid. At the same time, the ore flow is mixed with the swirling wind at the lower end of the ore channel under the centripetal gathering effect of the vector annular grid to form a specific form of gas-particle two-phase flow; 4. The gas-particle two-phase flow combines with the flame to produce a smelting reaction, generating molten droplets that fall into the sedimentation tank and are separated by sedimentation to obtain the product.

[0013] The present invention has the following beneficial effects: The swirl flotation nozzle of the present invention is provided with an opening regulating valve at the upper end entrance of the oxygen-enriched channel. By adjusting the opening of the regulating valve, the wind speed regulation function of the process oxygen-enriched air is realized. According to production needs, the tangential speed of the process oxygen-enriched air is controlled, thereby affecting the divergence of the process oxygen-enriched air swirl.

[0014] The swirl flotation nozzle of the present invention is provided with a vector annular grid at the lower end of the ore channel. The concentrate material passing through the vector annular grid is subject to the guiding effects of centripetal convergence and tangential swirl. The tangential swirl is used to compensate for the divergence angle of the concentrate discharge, and the centripetal convergence is used to constrain the diameter of the gas-particle two-phase flow formed after the concentrate material is mixed with the swirl, thereby improving the uniformity of material distribution and ensuring that the gas-particle two-phase flow is fully in contact with the process oxygen-enriched air to improve the combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall appearance structure of the device of the present invention; Figure 2 It is a schematic diagram of the internal structure of the device of the present invention; Figure 3 It is a schematic diagram of the top view of the structure of the sandwich core tube part in the device of the present invention; Figure 4 This is a schematic diagram of the vector annular grid structure of the device of the present invention; Figure 5 This is a schematic diagram of the top view of the vector annular grid of the device of the present invention; Figure 6 This is a schematic diagram of the front view structure of the vector annular grid of the device of the present invention; Figure 7 It is a schematic diagram of the gas-particle two-phase flow divergence state before the device of the present invention is used; Figure 8 It is a schematic diagram of the gas-particle two-phase flow divergence state after the device of the present invention is applied; Fig. 9 It is a schematic diagram of the refraction path trajectory of the flat vector grid plate in the prior art; Fig.10 It is a schematic diagram of the refraction path trajectory of the curved surface vector grid plate of the device of the present invention; Fig.11 This is a comparative data table of the device of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Example 1 See also Figure 1-3 A vector-controlled swirl flotation nozzle includes an inner sandwich core barrel part responsible for gas mixing and an outer sandwich sleeve part responsible for gas-particle mixing; the inner sandwich core barrel part includes a natural gas channel 10, an air channel 20 and an oxygen-enriched channel 30 from the inside to the outside; the outer sandwich sleeve part includes a mineral channel 40 and a rotating wind channel 50 from the inside to the outside; the natural gas channel 10, the air channel 20 and the oxygen-enriched channel 30 are mainly responsible for the introduction of oxygen-enriched air and gas; the mineral channel 40 and the rotating wind channel 50 are mainly responsible for the introduction of concentrate materials and swirl process wind.

[0018] The upper ends of the natural gas channel 10, the air channel 20, the oxygen-enriched channel 30, the mineral channel 40 and the rotating wind channel 50 are respectively provided with mutually independent natural gas inlets 11, air inlets 21, oxygen-enriched inlets 31, mineral inlets 41 and rotating wind inlets 51, and the heights of the natural gas inlets 11, the air inlet 21, the oxygen-enriched inlet 31, the mineral inlet 41 and the rotating wind inlet 51 decrease step by step from the inside to the outside; the lower ends of the natural gas channel 10, the air channel 20, the oxygen-enriched channel 30, the mineral channel 40 and the rotating wind channel 50 are connected and converged; the entrances of the oxygen-enriched inlet 31, the mineral inlet 41 and the rotating wind inlet 51 are respectively provided with two axially symmetrically distributed, and the directions are tangent to the outer walls of the oxygen-enriched channel 30, the mineral channel 40 and the rotating wind channel 50 respectively; the lower parts of the two mineral inlets 41 are respectively provided with fluidizers 42, and the fluidizers 42 are responsible for blowing up the concentrate to disperse the concentrate.

[0019] A cooling water jacket 70 is provided at the lower end of the outer wall of the outer interlayer sleeve portion, and the cooling water jacket 70 can be passed with circulating cooling water to cool down and protect the lower end of the nozzle.

[0020] The two oxygen-enriched inlets 31 are respectively provided with opening regulating valves 32. By adjusting the opening of the regulating valves, the wind speed regulation function of the process oxygen-enriched air is realized. According to production needs, the tangential velocity of the process oxygen-enriched air is controlled, thereby affecting the divergence of the process oxygen-enriched air swirl.

[0021] In the original nozzle structure, the lower end of the material channel 40 directly enters the reaction tower space. When the oxygen-enriched air swirl is insufficient and the diffusion angle is small, incomplete reaction is likely to occur. However, excessive diffusion of the reaction will scour the wall of the reaction tower, causing erosion of the furnace lining and affecting the safety of the furnace body.

[0022] Thus, if Figure 4-6 A vector annular grille 60 is provided at the lower end of the ore channel 40. The vector annular grille 60 includes a double concentric ring skeleton 61. A plurality of vector grille plates 62 distributed in a circumferential array are provided between the double concentric ring skeletons 61. The vector grille plates 62 are three-dimensional blades formed by a twisting process, and have the functions of guiding the ore vertically downward in two directions: centripetal gathering and tangential swirl. As shown in the figure, based on the structural design purpose of the vector annular grille 60, this embodiment conducted a control experiment under two conditions of whether the vector annular grille 60 was installed in the nozzle, and recorded the swirl divergence angles of the gas-particle two-phase flow formed by the two structures through dynamic simulation.

[0023] like Figure 7 and 8 As shown, they are respectively diagrams of the swirl divergence angle states of the gas-particle two-phase flow before and after the nozzle is installed with the vector annular grille 60 structure of the present invention. Figure 7Before the vector annular grid 60 is installed, the swirl divergence angle of the gas-particle two-phase flow is relatively large. From the on-site equipment phenomenon investigation, it is concluded that the swirl divergence angle of the gas-particle two-phase flow is excessively diffused. The gas-particle two-phase flow scours the wall of the reaction tower, causing erosion of the furnace lining and affecting the safety of the furnace body. Figure 8 After the installation of the vector annular grid 60, the concentrate material is subjected to the flow diversion effects of the centripetal gathering and tangential swirl. When the material falls and contacts the vector grid plate 62, the tangential swirl force increases the material distribution angle, improving the uniformity of the material distribution; at the same time, the centripetal gathering force reduces the diameter of the gas-particle two-phase flow formed after the material and the swirl wind are mixed, ensuring that the material is fully in contact with the process oxygen-enriched air, and no longer causes scouring of the cooling elements of the reaction tower skirt. At the same time, the smelting reaction degree is highly complete, preventing the occurrence of "raw material" and other problems. Thus, the above-mentioned technical problems are solved.

[0024] Furthermore, Fig. 9 and Fig.10 In comparison, the vector grating plate 62 used in the present embodiment adopts a twisted curved surface shape with an attached curvature. Compared with the straight blades installed at an angle in the prior art, since the rebound angles of material particles contacting the vector grating plate 62 are different, it has a diffuse refraction effect, so that the material has a larger divergence angle range, thereby being able to improve the uniformity of the material distribution.

[0025] Example 2 Based on Example 1, it is known that after the installation of the vector annular grid 60, the swirl nozzle device improves the phenomenon of the gas-particle two-phase flow scouring the cooling element of the reaction tower skirt by reducing the swirl divergence angle of the gas-particle two-phase flow; in order to further verify the influence of the tangential swirl inclination angle of the vector grid plate 62 in the vector annular grid 60 on the material distribution divergence angle and the gas-particle two-phase flow morphology, this embodiment provides three groups of comparative examples with the tangential swirl inclination angle of the vector grid plate 62 as a variable, and records the experimental data such as Fig.11 As shown; Through the analysis of experimental data, when the tangential swirl inclination angle of the vector grid plate 62 is 30° to the material distribution divergence angle, the material is not discharged smoothly, and the material returns upward; when the tangential swirl inclination angle of the vector grid plate 62 is 60° to the material distribution divergence angle, the material speed and wind speed are too fast, the material is broken up, and the reaction is incomplete; and when the tangential swirl inclination angle of the vector grid plate 62 is 45° to the material distribution divergence angle α, the material distribution is uniform, and the normal gas-particle two-phase flow formed can fully contact with the process oxygen-enriched air, no longer causing scouring of the cooling elements of the reaction tower skirt, and at the same time making the smelting reaction degree highly complete. Therefore, in this embodiment, it is preferred that the inclination angle of the vector grid plate 62 in the tangential swirl direction is 45°.

[0026] Example 3 Based on the above-mentioned embodiments 1 and 2, this embodiment provides a working method of a vector-controlled rotary floating nozzle, including the vector-controlled rotary floating nozzle of the above-mentioned embodiment, including the following working steps: 1. The natural gas channel 10, the air channel 20 and the oxygen-enriched channel 30 are respectively introduced with fuel gas and mixed oxygen air, and ignited at the lower end of the nozzle to form a jet flame; 2. The dried concentrate enters the mineral channel 40. The fluidized air in the fluidizer 42 blows up the concentrate and disperses it, and then it falls into the mineral channel 40. The concentrate is evenly distributed along the circumference of the annular cross section of the mineral channel 40. 3. A high-pressure airflow is introduced into the upper end of the rotating wind channel 50, and a swirling wind is formed in the rotating wind channel 50. The concentrate falling from the ore channel 40 first forms a uniformly distributed ore flow under the tangential swirling flow guidance of the vector annular grid 60. At the same time, based on the centripetal convergence effect of the vector annular grid 60, the ore flow is mixed with the swirling wind at the lower end of the ore channel 40 to form a specific form of gas-particle two-phase flow; 4. The gas-particle two-phase flow combines with the flame to produce a smelting reaction, generating molten droplets that fall into the sedimentation tank and are separated by sedimentation to obtain the product.

[0027] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A vector controlled swirl floating nozzle, comprising an inner sandwich core barrel portion responsible for gas mixing and an outer sandwich sleeve portion responsible for gas-particle mixing; the inner sandwich core barrel portion comprises a natural gas channel (10), an air channel (20) and an oxygen-enriched channel (30) in sequence from the inside to the outside; the outer sandwich sleeve portion comprises a mineral material channel (40) and a swirl wind channel (50) in sequence from the inside to the outside; the characteristics are: An opening regulating valve (32) is provided at the upper inlet of the oxygen-enriched channel (30); A vector annular grille (60) is provided at the lower end of the mineral material passage (40), the vector annular grille (60) comprising a double concentric circular ring skeleton (61), a plurality of vector grille plates (62) distributed in a circumferential array being provided between the double concentric circular ring skeletons (61), the vector grille plates (62) being three-dimensional blades formed by a twisting process, and having the function of guiding the mineral materials in two directions, namely, centripetal gathering and tangential swirl, for the mineral materials flowing vertically downward.

2. A vector controlled floating nozzle as claimed in claim 1, characterized in that: The upper ends of the natural gas channel (10), the air channel (20), the oxygen-enriched channel (30), the mineral channel (40) and the rotating wind channel (50) are respectively provided with mutually independent natural gas inlets (11), air inlets (21), oxygen-enriched inlets (31), mineral channel (41) and rotating wind inlets (51); the heights of the natural gas inlets (11), the air inlets (21), the oxygen-enriched inlets (31), the mineral channel (41) and the rotating wind inlets (51) decrease step by step from the inside to the outside; and the lower ends of the natural gas channel (10), the air channel (20), the oxygen-enriched channel (30), the mineral channel (40) and the rotating wind channel (50) are connected and converged.

3. A vector controlled floating nozzle as claimed in claim 2, characterized in that: The oxygen-enriched inlet (31), the mineral material inlet (41) and the rotating air inlet (51) are each provided with two inlets which are axially symmetrically distributed and are tangent to the outer walls of the oxygen-enriched channel (30), the mineral material channel (40) and the rotating air channel (50), respectively.

4. A vector controlled floating nozzle as claimed in claim 2, characterized in that: The opening regulating valve (32) is respectively provided at the two oxygen-enriched inlets (31).

5. The vector controlled floating nozzle according to claim 2, characterized in that: A fluidizer (42) is respectively arranged below the two mineral material inlets (41).

6. The vector controlled floating nozzle according to claim 1, characterized in that: A cooling water jacket (70) is provided at the lower end of the outer wall of the outer interlayer sleeve portion.

7. The vector controlled floating nozzle according to claim 1, characterized in that: The inclination angle of the vector grid plate (62) in the tangential swirl direction is 45°.

8. A method for operating a vector-controlled rotary floating nozzle, comprising the vector-controlled rotary floating nozzle according to any one of claims 1 to 7, characterized in that: The following steps are included: (1) The natural gas channel (10), the air channel (20) and the oxygen-enriched channel (30) are respectively introduced with fuel gas and oxygen-mixed air, and ignited at the lower end of the nozzle to form a jet flame; (2) The dried concentrate enters the mineral material channel (40), and the fluidizing air in the fluidizer (42) blows up the concentrate to disperse the concentrate and then the concentrate falls into the mineral material channel (40), and the concentrate is evenly distributed along the circumference of the annular cross section of the mineral material channel (40); (3) A high-pressure airflow is introduced into the upper end of the rotating air channel (50), and a swirling wind is formed in the rotating air channel (50). The concentrate falling from the ore channel (40) is first formed into an ore flow with uniform distribution and diffusion under the tangential swirling flow guiding action of the vector annular grid (60). At the same time, based on the centripetal gathering action of the vector annular grid (60), the ore flow is mixed with the swirling wind at the lower end of the ore channel (40) to form a gas-particle two-phase flow with a specific form; (4) The gas-particle two-phase flow combines with the flame to produce a smelting reaction, generating molten droplets that fall into the sedimentation tank and are separated by sedimentation to obtain the product.

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