Charging hopper device and molten iron pretreatment device

Abstract

The utility model relates to a charging hopper device and a molten iron pretreatment device. The charging hopper device comprises a hopper body, the grid supporting seat is mounted in the funnel body, and the shape of the outer contour of the grid supporting seat is matched with the shape of the cross section of the funnel body; the crushing device comprises a center rod and a plurality of long-strip-shaped cutters surrounding the center rod, and the center rod is vertically installed in the center of the grid supporting base; the cutter is arranged in a downward inclined mode outwards from the center rod in the length direction, the upward side edge of the cutter is provided with a cutting edge, the upper end of the cutter is connected with the center rod, and the lower end of the cutter is connected with the grid supporting base. According to the hopper, powder can be distributed more uniformly in the hopper, the storage amount is relatively larger, and the granularity of the powder is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to metallurgical field especially relates to a charging hopper device and molten iron pretreatment device. BACKGROUND

[0002] At present, the composite injection method of metallurgical enterprises has become one of the mainstream desulfurization processes in molten iron pretreatment, its main feature is that Mg powder and CaO powder are mixed in a pipeline according to a certain proportion in a flow state, and are injected into molten iron through a spray gun for desulfurization, which can greatly improve the desulfurization efficiency of molten iron and save the desulfurization cost, and the process is widely used in large steel plants. However, the particle size of Mg powder and the mixing degree with CaO become new factors restricting the desulfurization efficiency.

[0003] Mg particles as the main desulfurizer, its reaction rate directly affects the desulfurization efficiency and desulfurization cost. The Mg particle dissolution loss is very small at the beginning of desulfurization, and most of the Mg reacts with sulfur in a gaseous form to generate MgS, and then as the sulfur content of molten iron decreases, the magnesium desulfurization reaction changes to a liquid form in the molten iron, that is, the reaction occurs: [S]+[Mg]=[MgS], so the loss of magnesium increases exponentially, when the sulfur content in the molten iron is reduced to a certain extent, Mg is mainly consumed in dissolution rather than chemical reaction. Therefore, reducing the particle size of magnesium powder has become a necessary means to optimize the early desulfurization environment and improve the desulfurization efficiency.

[0004] However, the existing magnesium powder charging hopper has a simple structure, and the Mg particles are not further processed, only having the functions of storage and guidance. The Mg particles are added to the molten iron, the fusion speed is slow, the pretreatment efficiency is low, and the pretreatment time is prolonged and the desulfurization cost is increased. INVENTION CONTENTS

[0005] The utility model aims at providing a charging hopper device and molten iron pretreatment device, which can make the powder more evenly distributed in the hopper, have relatively more storage capacity, and reduce the particle size of the powder.

[0006] The utility model can be realized by adopting the following technical solutions:

[0007] The utility model provides a charging hopper device, which comprises:

[0008] The cross-sectional area of the inner cavity of the hopper body gradually decreases from top to bottom;

[0009] The grid support seat is installed in the hopper body, and the outer contour shape of the grid support seat matches the cross-sectional shape of the hopper body;

[0010] The breaking device comprises a center rod and a plurality of long strip-shaped cutters surrounding the center rod, the center rod is vertically installed at the center of the grid support base; the length direction of the cutter is outwardly inclined downward from the center rod, the upward side of the cutter has a blade, the upper end of the cutter is connected with the center rod, and the lower end is connected with the grid support base.

[0011] In a preferred embodiment of the present application, the cutter comprises a detachably connected mounting plate and blade, the two ends of the mounting plate are connected with the center rod and the grid support base respectively, and the first side of the blade along the width direction of the blade can be exposed upwardly from the mounting plate, and the blade is formed on the first side.

[0012] In a preferred embodiment of the present application, the blade is in a sawtooth structure.

[0013] In a preferred embodiment of the present application, the plate surface of the cutter is vertically arranged, or the plate surface of the cutter is arranged to be inclined relative to the vertical surface.

[0014] In a preferred embodiment of the present application, the top end of the center rod is formed into a pointed structure with a pointed end upwardly.

[0015] In a preferred embodiment of the present application, the grid support base comprises a grid-shaped support base and a grid-shaped cutter base, the outer contour shape of the support base is matched with the cross-sectional shape of the funnel body, the cutter base is installed on the support base, and the bottom end of the center rod is connected with the center of the cutter base.

[0016] In a preferred embodiment of the present application, a preset interval is left between the second end of the cutter and the inner wall of the funnel body.

[0017] In a preferred embodiment of the present application, the number of cutters is four, the upper ends of the four cutters are connected at the same position height of the center rod, the distances from the lower ends of the four cutters to the center rod are the same, and the four cutters are uniformly arranged along the circumferential direction of the center rod.

[0018] In a preferred embodiment of the present application, the cross section of the funnel body is rectangular or circular, and the bottom opening of the funnel body constitutes a discharge port and is provided with a valve.

[0019] The present application also provides a molten iron pretreatment device comprising the above-mentioned charging funnel device, and the charging funnel device is used for magnesium powder charging.

[0020] As described above, the charging funnel device of this utility model, by setting a grid support base and a crushing device inside the funnel body, has multiple long strip-shaped cutters whose upper ends are all connected to a central rod, and whose lower ends are arranged in a downward-sloping outward direction. These cutters form a cone-like arrangement. When adding powder using gas conveying, the powder is continuously loaded downwards from the center of the funnel body. The powder falls along the downward-sloping cutters, dispersing to the center and perimeter of the funnel body, avoiding the formation of small mounds. This results in more uniform powder distribution within the funnel body and a relatively larger storage capacity. Simultaneously, each cutter has an upward-facing blade; as the material falls through the cutters, the blades crush the material, further reducing the particle size of the powder. When this device is applied to the feeding of magnesium powder in molten iron pretreatment, it further reduces the particle size of the magnesium powder and improves desulfurization efficiency.

[0021] This utility model's molten iron pretreatment device utilizes multiple blades arranged in a generally conical shape within the charging funnel to prevent the formation of a magnesium powder stack structure with a high center and low sides within the funnel body. This results in a more rational magnesium powder feeding process, leading to a more uniform distribution of magnesium powder within the funnel body and a relatively larger storage capacity. Simultaneously, the cutting edges on the blades can crush large pieces of magnesium powder during the Mg particle feeding process, further reducing the particle size of the magnesium powder. This increases the contact area between magnesium powder and molten iron during the molten iron pretreatment process, enhances the mixing degree of magnesium powder and CaO, and accelerates the desulfurization rate. Attached Figure Description

[0022] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0023] Figure 1 This is a schematic diagram of the structure of the feeding funnel device provided by this utility model.

[0024] Figure 2 A top view of the feeding funnel device provided by this utility model without the support frame installed.

[0025] Figure 3 This is a schematic diagram illustrating the cooperation between the cutting tool, the central rod, and the tool base provided by this utility model.

[0026] Figure 4 for Figure 3 Top view.

[0027] Figure 5 This is a schematic diagram of the structure of the cutting tool provided by this utility model.

[0028] Figure 6 for Figure 5 Side view.

[0029] Explanation of icon numbers:

[0030] 1, funnel body; 11, discharge valve;

[0031] 2, grid support seat; 21, support base; 211, fourth steel plate; 212, fifth steel plate; 213, sixth steel plate; 22, tool base; 221, first steel plate; 222, second steel plate; 223, third steel plate;

[0032] 3, center rod;

[0033] 4, tool; 41, mounting plate; 42, blade; 421, cutting edge; 43, fastener;

[0034] 5, support frame. DETAILED DESCRIPTION

[0035] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific embodiments of the present application will be described with reference to the drawings.

[0036] As shown in Figures 1 to 6 , the present embodiment provides a charging funnel device, comprising:

[0037] Funnel body 1, the cross-sectional area of the inner cavity gradually decreases from top to bottom;

[0038] Grid support seat 2 is installed in the funnel body 1, and the outer contour shape of the grid support seat 2 matches the cross-sectional shape of the funnel body 1;

[0039] The crushing device includes a center rod 3 and a plurality of long strip-shaped tools 4 around the center rod 3, and the center rod 3 is vertically installed at the center of the grid support seat 2; The length direction of the tool 4 is arranged downwardly inclined outward from the center rod 3, the upward side of the tool 4 has a cutting edge 421, the upper end of the tool 4 is connected with the center rod 3, and the lower end is connected with the grid support seat 2.

[0040] The charging funnel device in the present embodiment can be used for charging any powder, and is particularly suitable for charging magnesium powder in hot metal pretreatment. Taking magnesium powder as an example, the existing magnesium powder charging funnel structure does not have the grid support seat 2 and the crushing device of the present application, only has a charging funnel, the upper end of the funnel is connected with a feeding pipe, and the magnesium powder is charged into the funnel by a protective gas conveying mode. In this charging mode, the magnesium powder is continuously charged downward from the middle of the funnel during the discharging process, and the discharging is not very uniform. After the charging is completed, the magnesium powder in the entire funnel forms a small mountain shape with high middle and low both sides, which leads to uneven distribution of the magnesium powder in the funnel and relatively small storage capacity.

[0041] The charging hopper device of the embodiment is characterized in that the grid support seat 2 and the crushing device are arranged in the hopper body 1, the upper ends of the plurality of long strip-shaped cutters 4 are connected with the central rod 3, the lower ends are arranged in an outwardly inclined downward manner, the plurality of cutters 4 form a conical arrangement structure, when the powder is charged by gas conveying, the powder is continuously charged downward from the middle of the hopper body 1, and the powder is dispersed to the middle and the periphery of the hopper body 1 along the inclined downward cutters 4, so that the shape of the small hill is avoided, the powder is more evenly discharged during charging, the powder is more evenly distributed in the hopper body 1, and the storage capacity is relatively more. Meanwhile, the cutters 4 are provided with upwardly inclined blades 421, the blades 421 crush the material when the material falls through the cutters 4, which is more conducive to reducing the particle size of the powder. When the device is applied to the magnesium powder charging of the hot metal pretreatment, it is more conducive to reducing the particle size of the magnesium powder and more conducive to improving the desulfurization efficiency.

[0042] In the specific implementation mode, in order to facilitate processing and installation, referring to Figure 3 、 Figure 5 and Figure 6 , the cutter 4 comprises a detachably connected mounting plate 41 and a blade 42, the two ends of the mounting plate 41 are connected with the central rod 3 and the grid support seat 2 respectively, the first side of the blade 42 along the width direction thereof can be exposed to the mounting plate 41 upwardly, and the blade edge 421 is formed on the first side.

[0043] The mounting plate 41 and the blade 42 are both long strip-shaped plate structures, the two side edges of the blade 42 along the width direction thereof are respectively marked as a first side and a second side, the thickness of the part of the blade 42 close to the first side thereof gradually decreases along the width direction thereof to form the blade edge 421; the plate surface of the blade 42 close to the back thereof (i.e. close to the second side) is parallelly attached to the mounting plate 41 and is fixed to the mounting plate 41 by the corresponding fastener 43. The mounting plate 41 can be made of a steel plate and is mainly used for fixing the blade 42. A plurality of bolt holes can be arranged in the blade 42 along the length direction thereof at the position close to the back thereof, and the blade 42 is connected with the mounting plate 41 by the fastener 43 composed of a bolt, a nut and a gasket.

[0044] The blade edge 421 can adopt a sawtooth structure, which comprises a plurality of crushing teeth arranged uniformly on the first side along the length direction of the blade 42, and the tooth tips of the crushing teeth are all arranged upwardly to be more conducive to crushing the powder. The size and angle of the specific sawtooth structure are determined according to actual needs, for example, in an embodiment, the sawtooth angle of the blade 42 is 53°, the sawtooth height is 10 mm, and the sawtooth thickness is 2 mm.

[0045] The entire cutter 4 is a long strip-shaped plate structure, and the plate surface of the cutter 4 can be arranged according to Figure 3The knife 4 can also be arranged to be inclined relative to the vertical plane, so that the powder slides down along the knife 4 while also generating a rotating force, which is more conducive to the dispersion of the powder and makes the dispersion more uniform.

[0046] With reference to Figure 3 And Figure 5 The plate surface of the entire knife 4 is in a trapezoidal structure, and the two ends along the length direction form inclined edges, and the portions close to the two ends are in a triangular structure, so as to better fit and connect the central rod 3 and the grid support base 2.

[0047] The top end of the central rod 3 is preferably formed in a pointed structure with a pointed head upward, which can also play a certain crushing and guiding role on the powder.

[0048] Further, the grid support base 2 includes a grid-shaped support base 21 and a grid-shaped knife base 22, the outer contour shape of the support base 21 matches the cross-sectional shape of the funnel body 1, the knife base 22 is installed on the support base 21, and the bottom end of the central rod 3 is connected with the center of the knife base 22.

[0049] The central rod 3 can adopt a round steel with a pointed top end, and the upper part of the round steel is in a conical shape, and the lower part is in a cylindrical structure, and the bottom is welded with the knife base 22. The knife base 22 is a mesh support formed by connecting a plurality of steel plates, and is mainly used for installing the central rod 3 and the knife 4; the support base 21 is a mesh structure formed by connecting a plurality of steel plates, and is used for supporting and fixing the knife base 22 and the crushing device.

[0050] Generally, the bottom end of the central rod 3 is welded with the center of the knife base 22, the two ends of the mounting plate 41 are welded with the central rod 3 and the knife base 22 respectively, the knife base 22 is welded with the support base 21, and the support base 21 is welded with the inner wall of the funnel body 1. Of course, other connection methods can also be adopted, and the present embodiment is only for illustration.

[0051] In some preferred embodiments, a preset interval is left between the second end of the knife 4 and the inner wall of the funnel body 1. As known from the foregoing analysis, when the powder is conveyed by gas, the powder is continuously charged from the middle of the funnel body 1 downward, so that the interval is left between the second end of the knife 4 and the inner wall of the funnel body 1, and the knife 4 does not cover the entire grid support base 2, which is more in line with the characteristics of the gas-conveyed powder, and the powder charged from the middle is guided and crushed by the knife 4 close to the middle region, so as to ensure the dispersion and crushing of the material while simplifying the structure and saving the cost.

[0052] The number of cutters 4 is determined according to actual needs. When a plurality of cutters 4 are arranged around the central rod 3, the upper ends of the cutters 4 can be connected at the same position height of the central rod 3, or can be connected at different position heights. The distances from the lower ends of the cutters 4 to the central rod 3 can be the same or different.

[0053] In a specific embodiment, referring to Figure 1 and Figure 3 , the number of cutters 4 is four. The upper ends of the four cutters 4 are connected at the same position height of the central rod 3. The distances from the lower ends of the four cutters 4 to the central rod 3 are the same. The four cutters 4 are uniformly arranged along the circumference of the central rod 3, and the four cutters 4 form a quadrangular pyramid structure.

[0054] The cross section of the funnel body 1 can be rectangular or circular. The bottom opening of the funnel body 1 forms a discharge port and is provided with a discharge valve 11. The charging funnel device further comprises a support frame 5 for supporting the funnel body 1.

[0055] In a specific embodiment, the funnel body 1 is rectangular in shape, and the outer contours of the support base 21 and the cutter base 22 are also rectangular. For the case where the number of cutters 4 is four, referring to Figure 3 and Figure 4 , the cutter base 22 is formed by welding seven steel plates, specifically four first steel plates 221, two second steel plates 222 and one third steel plate 223. The plate surfaces of the steel plates are vertically arranged. The four first steel plates 221 are sequentially connected to form a rectangular frame. The two ends of the third steel plate 223 are connected to the middle of the opposite two first steel plates 221. The two second steel plates 222 are symmetrically arranged on the two sides of the third steel plate 223. The two ends of the second steel plate 222 are respectively connected to the middle of the third steel plate 223 and the corresponding first steel plate 221. The bottom end of the central rod 3 is connected to the middle of the top of the third steel plate 223. The second steel plate 222 and the third steel plate 223 are used to fix the cutters 4. The lower ends of the four cutters 4 are respectively welded to the top of the second steel plate 222 or the third steel plate 223. Referring to Figure 2 , the support base 21 is formed by welding steel plates of three size specifications, specifically 44 fourth steel plates 211, 11 fifth steel plates 212 and 110 sixth steel plates 213.

[0056] The size and number of each steel plate are determined according to the number of cutters 4, the cross-sectional shape of the funnel body 1 and actual needs. The present embodiment is only for illustrative purposes.

[0057] In operation, the bottom of the center rod 3 is welded to the center of the cutter base 22, the two ends of each mounting plate 41 are welded to the center rod 3 and the cutter base 22 respectively, each blade 42 is fixed to the corresponding mounting plate 41 by bolts, nuts and gaskets, the cutter base 22 is welded to the center of the support base 21, and the support base 21 is welded to the inside of the funnel body 1. When loading, the magnesium powder falls from the top, is crushed by the cutter 4, is screened by the support base 21, and is uniformly arranged in the inside of the funnel body 1.

[0058] When installing, attention should be paid that, after the cutter 4 is fixed to the grid support base 2, the upper and lower structures of the cutter 4 should not interfere with the lower structure of the center rod 3 and the grid support base 2. The outer dimension of the support base 21 should not interfere with the top loading port of the funnel body 1. In the embodiment, the overall height of the grid support base 2 and the crushing device is 430 mm, which can avoid conflict with the upper structure.

[0059] Further, the embodiment also provides a molten iron pretreatment device, which comprises the loading funnel device.

[0060] By using the plurality of cutters 4 arranged in a generally conical shape in the loading funnel device, the magnesium powder stacking structure of middle high and both sides low in the funnel body 1 can be prevented, the magnesium powder unloading is more reasonable, the magnesium powder is more uniformly distributed in the funnel body 1, and the storage capacity is relatively larger. Meanwhile, by using the blade 421 on the cutter 4, the crushing treatment of the large magnesium powder in the Mg particle unloading process can be realized, which is more conducive to reducing the particle size of the magnesium powder, increasing the contact area of the magnesium powder and the molten iron in the molten iron pretreatment process, increasing the mixing degree of the magnesium powder and CaO, and accelerating the desulfurization rate.

[0061] In summary, the loading funnel device and the molten iron pretreatment device in the embodiment have the following advantages:

[0062] (1) The loading funnel device cuts and crushes the Mg particles by the blade 42, which greatly reduces the content of large particles, and the support base 21 with a net structure can further screen the magnesium powder (mainly screen large particles), so that the magnesium powder particles are more uniform, which is conducive to improving the magnesium-sulfur reaction conditions in the molten iron pretreatment process, optimizing the desulfurization environment, shortening the desulfurization time, and reducing the amount of powder used, thereby improving the quality of molten steel and reducing the cost of desulfurization.

[0063] (2) The loading funnel device adopts four cutters 4 to crush the magnesium particles, and the four cutters 4 are in a four-pyramid structure, which effectively avoids the problem of uneven distribution of magnesium powder during unloading, solves the problems of difficult unloading of large particles, poor reaction kinetics and poor desulfurization effect, and can significantly improve the desulfurization environment and shorten the desulfurization time.

[0064] (3) The whole charging hopper device has simple structure, is convenient to install, and is convenient to maintain and replace.

[0065] The above merely illustrates the specific implementation of the present application, and is not intended to limit the scope of the present application. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present application shall fall within the scope of the present application.

Claims

1. A charging hopper arrangement, characterized in that The device comprises: a funnel body, the cross-sectional area of the inner cavity of which gradually decreases from top to bottom; a grid support seat installed in the funnel body, and the outer contour shape of the grid support seat matches the cross-sectional shape of the funnel body; a crushing device comprising a central rod and a plurality of long strip-shaped cutters surrounding the central rod, the central rod is vertically installed at the center of the grid support seat; the length direction of the cutters is outwardly inclined downward from the central rod, the upward side of the cutters has a cutting edge, the upper end of the cutters is connected with the central rod, and the lower end is connected with the grid support seat.

2. The charging funnel device according to claim 1, wherein the cutters comprise detachably connected mounting plates and blades, the two ends of the mounting plates are respectively connected with the central rod and the grid support seat, and the first side of the blades along the width direction of the blades can expose the mounting plates upward, and the first side forms the cutting edge.

3. The charging funnel device according to claim 1, wherein the cutting edge is a sawtooth structure.

4. The charging funnel device according to claim 1, wherein the plate surface of the cutters is vertically arranged, or the plate surface of the cutters is arranged obliquely relative to the vertical surface.

5. The charging funnel device according to claim 1, wherein the top end of the central rod forms a pointed structure with a pointed top.

6. The charging funnel device according to claim 1, wherein the grid support seat comprises a grid-shaped support base and a grid-shaped cutter base, the outer contour shape of the support base matches the cross-sectional shape of the funnel body, the cutter base is installed on the support base, and the bottom end of the central rod is connected with the center of the cutter base.

7. The charging funnel device according to claim 1, wherein a predetermined interval is left between the second end of the cutter and the inner wall of the funnel body.

8. The charging funnel device according to claim 7, wherein the number of cutters is four, the upper ends of the four cutters are connected at the same position height of the central rod, the distances from the lower ends of the four cutters to the central rod are the same, and the four cutters are uniformly arranged along the circumferential direction of the central rod.

9. The charging funnel device according to claim 1, wherein the cross section of the funnel body is rectangular or circular, the bottom opening of the funnel body constitutes a discharge port and is provided with a valve.

10. A molten iron pretreatment device characterized by comprising: The device comprises the charging funnel device according to any one of claims 1-9, and the charging funnel device is used for magnesium powder charging.

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