Waste steel preheating system and method based on converter flue gas waste heat utilization

Abstract

The invention provides a steel scrap preheating system and method based on converter flue gas waste heat utilization, and relates to the technical field of converter flue gas waste heat utilization, the steel scrap preheating system comprises a converter gas inlet, a plurality of preheating cylinders are installed on the side, away from the converter gas inlet, of a high-temperature channel, the preheating cylinders communicate with the high-temperature channel, and discharging cylinders are installed among the preheating cylinders; according to the waste steel preheating device, the multiple heat storage barrels are used for preheating waste steel raw materials in batches, connecting rods installed at the two output ends of a bidirectional motor are connected with an intercepting plate and a feeding ring, and therefore the waste steel raw materials can be preheated in batches; and the feeding ring uniformly feeds materials into the preheating cylinder, and the waste metal raw materials entering the preheating cylinder are discharged through the discharging holes formed in the intercepting plate, so that the waste metal raw materials entering the preheating cylinder are uniformly preheated, and are uniformly fed into the air inlet of the converter after being preheated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of converter flue gas waste heat utilization, in particular to a waste steel preheating system and method based on converter flue gas waste heat utilization. BACKGROUND

[0002] Converter steelmaking is the main process of modern steel production. In recent years, in order to reduce the consumption of molten iron and production cost, the proportion of scrap steel added in the converter is increasing. However, the addition of cold scrap steel will significantly reduce the temperature of the converter bath, and more chemical energy (such as the oxidation of silicon and carbon in molten iron) and physical heat are consumed to heat and melt the scrap steel, which not only limits the further increase of the scrap steel addition amount, but also increases the smelting cycle and energy consumption.

[0003] At present, there are blast furnace hot blast stove, ladle / steel ladle roaster and other devices that use gas combustion to preheat air or roast refractory materials, but they need to consume additional fuel. At the same time, a large amount of high-temperature flue gas (about 1400-1600℃) is generated during the blowing process of the converter, and the sensible heat of these flue gases is wasted or only partially recovered for steam power generation after vaporization cooling flue and dust removal system.

[0004] In the prior art, there are also some independent scrap steel preheating devices (such as patent CN107653356B), but they usually need independent combustion systems and fuel supply, which has high investment and operation cost, and there is a problem of tail gas environmental protection not meeting the standards due to the combustion of waste steel oil stains and other pollutants. How to efficiently and low-cost preheat the converter scrap steel is a problem to be solved in the field. SUMMARY

[0005] The present application is made in view of the above problems, and aims to provide a waste steel preheating system and method based on converter flue gas waste heat utilization to solve the problems raised in the background To achieve the above purpose, the present application provides the following technical scheme: a waste steel preheating system based on converter flue gas waste heat utilization, comprising a converter gas inlet, a high-temperature channel is installed above the converter gas inlet, a plurality of preheating cylinders are installed on the side of the high-temperature channel away from the converter gas inlet, the preheating cylinders are communicated with the high-temperature channel, a discharge cylinder is installed between the plurality of preheating cylinders, a waste steel storage chamber is installed on the upper end of the discharge cylinder, an annular groove is formed on the annular surface of the discharge cylinder in contact with the preheating cylinder, a plurality of connecting plates are installed in the annular groove, a discharge member is rotatably connected in the annular groove, a driving member is installed between the plurality of preheating cylinders, and the driving member is connected with the discharge member.

[0006] Further, the discharging element comprises a feeding ring, the feeding ring is rotationally connected in the annular groove, the feeding ring annular surface is provided with a feeding hole, the connecting ring annular inner surface upper side is provided with an inclined block, the driving element is connected with the inclined block, the inclined block is rotationally connected in the discharging cylinder, and the inclined block inclined surface faces the feeding hole.

[0007] Further, the driving element comprises a double-shaft motor, the double-shaft motor is arranged between the plurality of preheating cylinders, both output ends of the double-shaft motor are provided with connecting rods, and the upper connecting rod far end away from the double-shaft motor is connected with the inclined block through the discharging cylinder.

[0008] Further, the high-temperature channel upper side is rotationally connected with an intercepting plate, the lower connecting rod far end away from the double-shaft motor is connected with the intercepting plate, the intercepting plate side in contact with the preheating cylinder is provided with a discharging hole, and the discharging hole is in contact with the plurality of preheating cylinders alternately.

[0009] Further, the space formed by the plurality of preheating cylinders is provided with a heat insulation cylinder, the heat insulation cylinder is provided with heat insulation plates on the upper and lower sides, the double-shaft motor is arranged between the two heat insulation plates, and the two connecting rods penetrate through the two heat insulation plates.

[0010] Further, the distance between the discharging hole and the feeding hole is one preheating cylinder.

[0011] Further, the preheating cylinder annular surface upper side is provided with an exhaust hole, and the exhaust hole extends into the discharging hole.

[0012] Further, the high-temperature channel far side away from the converter gas inlet is provided with a sealing cylinder, the plurality of preheating cylinders are arranged in the sealing cylinder, the sealing cylinder outer side is provided with a protection cylinder, the protection cylinder far side away from the high-temperature channel is provided with a water storage cylinder, the protection cylinder is communicated with the water storage cylinder, the protection cylinder annular surface is provided with a water inlet pipe, and the water storage cylinder upper surface is provided with a water outlet pipe.

[0013] Further, the discharging cylinder annular surface is provided with a plurality of gas distribution cylinders, the gas distribution cylinders penetrate through the water storage cylinder and extend to the water storage cylinder outer side, the plurality of gas distribution cylinders far side away from the discharging cylinder is provided with a connecting cylinder, and the connecting cylinder annular surface is provided with an exhaust pipe.

[0014] A scrap steel preheating method based on converter flue gas waste heat utilization, and the specific steps are as follows: Step one: start the double-shaft motor to drive the two connecting rods to rotate, the lower connecting rod drives the intercepting plate to rotate, the intercepting plate drives the discharging hole to contact the plurality of preheating cylinders in turn when rotating, and the preheating cylinder inside the waste metal raw material falls into the converter gas inlet from the preheating cylinder, at the same time, the hot gas in the combustion furnace enters the preheating cylinder, the preheating cylinder inside the hot air enters the discharging cylinder through the exhaust hole, and the waste metal raw material in the discharging cylinder is preliminarily preheated. Step two: the upper connecting rod rotates through the connecting frame to drive the feeding ring to rotate, after the feeding ring rotates, the waste metal raw materials in the discharging cylinder enter the multiple preheating cylinders in sequence through the feeding holes, at this time, the waste metal raw materials previously entering the preheating cylinders are in contact with the hot air in the preheating cylinders, and the metal blocks are heated for the second time.

[0015] Compared with the prior art, the present application has the following beneficial effects: 1、The present application installs multiple preheating cylinders on the annular surface of the discharging cylinder, uses multiple heat storage cylinders to preheat the scrap steel raw materials in batches, and uses the connecting rods installed at the two output ends of the bidirectional motor to connect the intercepting plate and the feeding ring, uses the feeding ring to uniformly feed the preheating cylinders, and the waste metal raw materials entering the preheating cylinders are discharged through the discharge holes opened on the intercepting plate, thereby ensuring that the waste metal raw materials entering the preheating cylinders are uniformly preheated and uniformly fed into the converter air inlet after preheating.

[0016] 2、The present application installs sealing cylinders and protection cylinders on the annular surfaces of multiple preheating cylinders, and then passes water flow between the sealing cylinders and the protection cylinders, uses the increased contact area of multiple preheating cylinders with the sealing cylinders, thereby increasing the heat exchange effect of the water flow and improving the heat conversion efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the drawings, and other drawings can be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0018] Figure 1 It is a structural schematic diagram of the device of the present application; Figure 2 It is an assembly schematic diagram of the water storage cylinder and the protection cylinder of the device of the present application; Figure 3 It is a display diagram of the position of the intercepting plate of the device of the present application; Figure 4 It is an assembly schematic diagram of the double-shaft motor, the intercepting plate and the inclined block of the device of the present application; Figure 5 It is a structural schematic diagram of the preheating cylinder of the device of the present application; Figure 6 It is an assembly schematic diagram of the discharging cylinder and the preheating cylinder of the device of the present application.

[0019] Explanation of reference numerals: 1, converter gas inlet; 2, high-temperature channel; 3, water inlet pipe; 4, exhaust pipe; 5, connecting cylinder; 6, drain pipe; 7, discharge cylinder; 8, gas distribution cylinder; 9, water storage cylinder; 10, protection cylinder; 11, sealing cylinder; 12, preheating cylinder; 13, intercepting plate; 14, discharge hole; 15, inclined block; 16, feed ring; 17, feed hole; 18, heat insulation cylinder; 19, heat insulation plate; 20, connecting rod; 21, double-shaft motor; 22, exhaust hole; 23, annular groove; 24, connecting plate; 25, scrap storage chamber; 26, gas inlet.

[0020] The purposes, functional features and advantages of the drawings will be further described with reference to the drawings in conjunction with embodiments. DETAILED DESCRIPTION

[0021] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be described and explained in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0022] Obviously, the following description is only some examples or embodiments of the present application, and for those of ordinary skill in the art, the present application can also be applied to other similar scenarios without creative labor. In addition, it can be understood that although the efforts made in this development process can be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacture or production changes based on the technical content disclosed in the present application are only routine technical means and should not be understood as insufficient disclosure of the present application.

[0023] If not specifically stated, "including" and "comprising" mentioned in the present application means open or closed. For example, "including" and "comprising" can mean that other components not listed can also be included or contained, or only the listed components can be included or contained.

[0024] If not specifically stated, in the present application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or A and B are both true (or exist).

[0025] Explanation of terms: as Figures 1 to 6As shown, a waste steel preheating system based on converter flue gas waste heat utilization includes a converter air inlet 1 arranged above the converter, a high-temperature channel 2 is installed above the converter air inlet 1, a plurality of preheating cylinders 12 are installed on the side away from the converter air inlet 1 of the high-temperature channel 2, the preheating cylinders 12 are communicated with the high-temperature channel 2, a discharge cylinder 7 is installed between the plurality of preheating cylinders 12, a waste steel storage chamber 25 is installed on the upper end of the discharge cylinder 7, the waste steel stored in the waste steel storage chamber 25 first enters the discharge cylinder 7, and then is discharged into the plurality of preheating cylinders 12 through the discharge cylinder 7, and then the waste steel enters the converter air inlet 1 through the preheating cylinder 12, and the hot air of the converter air inlet 1 is discharged in the opposite way.

[0026] The annular surface of the discharge cylinder 7 in contact with the preheating cylinder 12 is provided with an annular groove 23, a plurality of connecting plates 24 are installed in the annular groove 23, and a feeding ring 16 is rotatably connected in the annular groove 23. The annular surface of the feeding ring 16 is provided with a feeding hole 17, an inclined block 15 is installed on the upper side of the annular inner surface of the connecting ring, the inclined block 15 is rotatably connected in the discharge cylinder 7, and the inclined surface of the inclined block 15 faces the feeding hole 17. A heat insulation cylinder 18 is installed in the space formed by the plurality of preheating cylinders 12, heat insulation plates 19 are installed on the upper and lower sides in the heat insulation cylinder 18, a double-shaft motor 21 is installed between the two heat insulation plates 19, connecting rods 20 are installed on the two output ends of the double-shaft motor 21, and the two connecting rods 20 respectively penetrate through the two heat insulation plates 19. The end of the upper connecting rod 20 away from the double-shaft motor 21 penetrates through the discharge cylinder 7 and is connected with the inclined block 15. After the double-shaft motor 21 is started, the output end of the double-shaft motor 21 rotates and drives the inclined block 15 to rotate through the connecting rod 20. The inclined block 15 drives the feeding ring 16 to rotate. At this time, the waste metal raw materials in the discharge cylinder 7 can enter the preheating cylinder 12 through the feeding hole 17.

[0027] The top of the high-temperature channel 2 is rotatably connected with an intercepting plate 13, the end of the lower connecting rod 20 away from the double-shaft motor 21 is connected with the intercepting plate 13, the side of the intercepting plate 13 in contact with the preheating cylinder 12 is provided with a discharge hole 14, the discharge hole 14 is in contact with the plurality of preheating cylinders 12 alternately, and the distance between the discharge hole 14 and the feeding hole 17 is one preheating cylinder 12.

[0028] When the intercepting plate 13 rotates to make the discharge hole 14 contact with the preheating cylinder 12, the preheated waste metal raw materials in the preheating cylinder 12 can enter the converter air inlet 1 through the discharge hole 14, and the hot air in the converter air inlet 1 also enters the preheating cylinder 12 through the discharge hole 14. With the rotation of the upper connecting rod 20 driving the inclined block 15 and the feeding ring 16, the waste metal raw materials in the discharge cylinder 7 enter the preheating cylinder 12 through the discharge cylinder 7. At this time, they can exchange heat with the hot air entering the preheating cylinder 12, thereby completing the preheating of the waste metal raw materials in the preheating cylinder 12, and ensuring that the waste metal raw materials entering the preheating cylinder 12 are uniformly preheated and uniformly discharged into the converter air inlet 1 after preheating.

[0029] The sealing cylinder 11 is installed on the side of the high-temperature channel 2 far from the gas inlet 1 of the converter, the plurality of preheating cylinders 12 are arranged in the sealing cylinder 11, the protection cylinder 10 is installed on the outside of the sealing cylinder 11, the water storage cylinder 9 is installed on the side of the protection cylinder 10 far from the high-temperature channel 2, the protection cylinder 10 communicates with the water storage cylinder 9, the water inlet pipe 3 is installed on the annular surface of the protection cylinder 10, the water outlet pipe 6 is installed on the upper surface of the water storage cylinder 9, the exhaust hole 22 is arranged on the upper side of the annular surface of the preheating cylinder 12 and extends into the discharge hole 14, the plurality of gas distribution cylinders 8 are installed on the annular surface of the discharge cylinder 7 and extend to the outside of the water storage cylinder 9 through the water storage cylinder 9, the connecting cylinder 5 is installed on the side of the plurality of gas distribution cylinders 8 far from the discharge cylinder 7, and the exhaust pipe 4 is installed on the annular surface of the connecting cylinder 5.

[0030] The sealing cylinder 11 and the protection cylinder 10 are installed on the annular surface of the plurality of preheating cylinders 12, and water flows between the sealing cylinder 11 and the protection cylinder 10, the contact area of the plurality of preheating cylinders 12 with the sealing cylinder 11 is increased, the heat exchange effect of the water flow is further increased, and the heat conversion efficiency is improved.

[0031] Working principle: The waste metal raw materials first enter the discharge cylinder 7 from the scrap steel storage room 25, then the two-way motor is started to drive the two connecting rods 20 to rotate, the upper connecting rod 20 drives the lower connecting rod 20 to rotate, and the intercepting plate 13 is driven to rotate, the intercepting plate 13 drives the discharge hole 14 to contact the plurality of preheating cylinders 12 in turn when rotating, and the waste metal raw materials in the preheating cylinder 12 fall into the converter gas inlet 1 from the preheating cylinder 12, and the hot gas in the combustion furnace enters the preheating cylinder 12 at the same time, the hot air in the preheating cylinder 12 enters the discharge cylinder 7 through the exhaust hole 22, and the waste metal raw materials in the discharge cylinder 7 are preliminarily preheated.

[0032] The upper connecting rod 20 drives the feeding ring 16 to rotate through the connecting frame, and the waste metal raw materials in the discharge cylinder 7 enter the plurality of preheating cylinders 12 in turn through the feeding hole 17 after the feeding ring 16 rotates, at this time, the waste metal raw materials previously entering the preheating cylinder 12 contact the hot air in the preheating cylinder 12, and the metal blocks are heated for the second time.

[0033] The hot gas entering the preheating cylinder 12 heats the preheating cylinder 12, the preheating cylinder 12 contacts the water flow between the sealing cylinder 11 and the protection cylinder 10 after being heated, and exchanges heat with the water flow, when the waste metal raw materials in the preheating cylinder 12 are discharged from the discharge hole 14, the hot air in the converter gas inlet 1 enters the preheating cylinder 12, at the same time, the original hot air in the preheating cylinder 12 enters the discharge cylinder 7 through the exhaust hole 22, and the waste metal raw materials in the discharge cylinder 7 are preliminarily preheated, and finally discharged from the water storage cylinder 9, and finally heat exchanged with the water flow in the water storage cylinder 9.

[0034] Note that the present application is not limited to the above-described embodiments. The above-described embodiments are merely examples, and embodiments having substantially the same configuration, function, and effect as the technical idea of the present application are included in the technical scope of the present application. Furthermore, other modes constructed by applying various modifications to the embodiments, or by combining part of the configurations of the embodiments, which can be conceived by those skilled in the art without departing from the spirit of the present application, are also included in the scope of the present application.

Claims

1. A scrap steel preheating system based on converter flue gas waste heat utilization, comprising a converter gas inlet (1), characterized in that, The converter gas inlet (1) is provided with a high-temperature channel (2) above it, a plurality of preheating cylinders (12) are installed on the side of the high-temperature channel (2) away from the converter gas inlet (1), the preheating cylinders (12) are communicated with the high-temperature channel (2), a discharging cylinder (7) is installed between the preheating cylinders (12), a scrap steel storage chamber (25) is installed on the upper end of the discharging cylinder (7), an annular groove (23) is formed on the annular surface of the discharging cylinder (7) in contact with the preheating cylinder (12), a plurality of connecting plates (24) are installed in the annular groove (23), a discharging element is rotatably connected in the annular groove (23), a driving element is installed between the preheating cylinders (12), and the driving element is connected with the discharging element.

2. The scrap preheating system based on the utilization of waste heat from converter flue gas according to claim 1, characterized in that, The discharging element comprises a feeding ring (16) rotatably connected in the annular groove (23), an annular surface of the feeding ring (16) is provided with a feeding hole (17), an inclined block (15) is installed on the upper side of the annular inner surface of the connecting ring, the driving element is connected with the inclined block (15), the inclined block (15) is rotatably connected in the discharging cylinder (7), and the inclined surface of the inclined block (15) faces the feeding hole (17).

3. The scrap preheating system based on the utilization of waste heat from converter flue gas according to claim 2, characterized in that, The driving element comprises a double-shaft motor (21) arranged between the preheating cylinders (12), connecting rods (20) are installed on both output ends of the double-shaft motor (21), and the ends of the connecting rods (20) away from the double-shaft motor (21) pass through the discharging cylinder (7) and are connected with the inclined block (15).

4. The scrap preheating system based on the utilization of waste heat from converter flue gas according to claim 3, characterized in that, An intercepting plate (13) is rotatably connected to the top of the high-temperature channel (2), the ends of the connecting rods (20) away from the double-shaft motor (21) are connected with the intercepting plate (13), a discharging hole (14) is formed on the side of the intercepting plate (13) in contact with the preheating cylinder (12), and the discharging hole (14) is in alternate contact with the preheating cylinders (12).

5. The scrap preheating system based on the utilization of waste heat from converter flue gas according to claim 3, characterized in that, A heat insulation cylinder (18) is installed in the space formed by the preheating cylinders (12), heat insulation plates (19) are installed on the upper and lower sides of the heat insulation cylinder (18), the double-shaft motor (21) is installed between the two heat insulation plates (19), and the two connecting rods (20) respectively penetrate the two heat insulation plates (19).

6. The scrap preheating system based on the utilization of waste heat from converter flue gas according to claim 4, characterized in that, The distance between the discharging hole (14) and the feeding hole (17) is one preheating cylinder (12).

7. The scrap preheating system based on the utilization of waste heat from converter flue gas according to claim 1, characterized in that, An exhaust hole (22) is formed on the upper side of the annular surface of the preheating cylinder (12), and the exhaust hole (22) extends into the discharging hole (14).

8. The scrap preheating system based on the utilization of waste heat from converter flue gas according to claim 1, characterized in that, A sealing cylinder (11) is installed on the side of the high-temperature channel (2) away from the converter gas inlet (1), the preheating cylinders (12) are arranged in the sealing cylinder (11), a protection cylinder (10) is installed on the outside of the sealing cylinder (11), a water storage cylinder (9) is installed on the side of the protection cylinder (10) away from the high-temperature channel (2), the protection cylinder (10) is communicated with the water storage cylinder (9), a water inlet pipe (3) is installed on the annular surface of the protection cylinder (10), and a water outlet pipe (6) is installed on the upper surface of the water storage cylinder (9).

9. The scrap preheating system based on the utilization of waste heat from converter flue gas according to claim 8, characterized in that, The annular surface of the discharge cylinder (7) is provided with a plurality of gas distribution cylinders (8), the gas distribution cylinders (8) extend through the water storage cylinder (9) to the outside of the water storage cylinder (9), a plurality of the gas distribution cylinders (8) are provided with a connecting cylinder (5) away from one side of the discharge cylinder (7), and the annular surface of the connecting cylinder (5) is provided with an exhaust pipe (4).

10. A method for preheating scrap steel based on the utilization of waste heat from converter flue gas, characterized in that, The specific steps are as follows: Step one: start the bidirectional motor to drive the two connecting rods (20) to rotate, the lower connecting rod (20) drives the intercepting plate (13) to rotate, the intercepting plate (13) drives the discharge hole (14) to contact with the plurality of preheating cylinders (12) in turn when rotating, and the waste metal raw materials in the preheating cylinder (12) fall into the converter air inlet (1) from the preheating cylinder (12), at the same time, the hot gas in the combustion furnace enters the preheating cylinder (12), and the hot air in the preheating cylinder (12) enters the discharge cylinder (7) through the exhaust hole (22) to preliminarily preheat the waste metal raw materials in the discharge cylinder (7); Step two: the upper connecting rod (20) drives the feeding ring (16) to rotate through the connecting frame, and the waste metal raw materials in the discharge cylinder (7) enter the plurality of preheating cylinders (12) through the feeding hole (17) after the feeding ring (16) rotates, at this time, the waste metal raw materials previously entering the preheating cylinder (12) contact with the hot air in the preheating cylinder (12) and are heated twice.

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