Under-machine dust removal and purification system of multi-stream stainless steel slab continuous casting machine

Abstract

The invention belongs to the technical field of environmental protection and dust removal, and particularly relates to a multi-stream stainless steel slab continuous casting machine under-machine dust removal purification system which comprises a continuous casting machine and a flame cutting machine, a plurality of sets of under-machine dust removal covers are arranged below the continuous casting machine and arranged on the side wall of a slag sluice in a staggered mode, and the flame cutting machine is arranged on the side wall of the slag sluice. And the under-machine dust removal cover is communicated with the dust removal flue. The dust removal pipeline is placed below the continuous casting machine, space is not occupied, and continuous casting equipment is convenient to overhaul and maintain; in addition, the dust removal cover is close to a smoke production point, the air suction effect is good, and the power of a motor to be used is small under the condition of achieving the same dust removal efficiency; meanwhile, flue gas containing iron powder does not pass through a flame cutting machine, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental protection dust removal, and in particular relates to an under-machine dust removal and purification system for a multi-stream stainless steel slab continuous casting machine. Background Art

[0002] The national environmental protection department has begun to focus on rectifying the pollution caused by unorganized dust emissions in steel enterprises. Local governments have set limits on unorganized emissions from sintering, ironmaking and steelmaking processes, requiring steel enterprises to basically complete ultra-low emission transformation, among which the particulate matter concentration requirement for unorganized emissions (sintering, ironmaking and steelmaking processes involving factory workshops) is 8mg / m3.

[0003] The dust in the flame cutting machine area is a visible and sensory dust pollution. It is directly discharged and diffuses into the interior and top of the factory building, causing huge pollution to the surrounding air and posing a great threat to the occupational safety of on-site operators. It is a key area for organized dust removal in the steelmaking workshop.

[0004] At present, the dust removal method at the flame cutting machine of the continuous casting machine mostly adopts the form of on-machine dust removal hood + dust removal pipe + bag dust collector. Specifically, a mobile or fixed dust removal hood covering the flame cutting machine is set at the cutting station of the continuous casting machine (the cutting length will vary according to the different cut lengths of the continuous casting billets). The flue gas is captured by the dust removal hood and then enters the bag dust collector through the pipe for purification.

[0005] The following related patents on dust removal for fire cutting machines have been searched: Patent CN214075665U describes a dust removal mechanism on a fire cutting machine. Patent CN213469916U describes a movable dust removal mechanism for a fire cutting machine. Patent CN107225133A describes a dust removal cover device for a continuous casting fire cutting machine.

[0006] The above three methods all use the form of dust removal on the top of the flame cutting machine. In this form of dust removal, the flue gas will pass through the flame cutting machine equipment and cause damage to it. This method is beneficial when dealing with the flue gas of ordinary carbon steel flame cutting machines. However, when cutting high-alloy, stainless steel and heat-resistant steel, the high-melting-point, high-viscosity chromium oxide will hinder the cutting operation. The cutting gas needs to be added with ultra-fine iron powder to assist in cutting, which will produce a larger amount of flue gas. Moreover, since the flue gas is mixed with iron powder, it will cause greater damage to the flame cutting machine equipment. In severe cases, it is necessary to stop production for maintenance, causing heavy losses. In addition, during flame cutting, the flue gas flows downward and the dust collector is on top. In order to ensure the suction effect, a dust collector with a larger air volume needs to be equipped. The environment induced wind is more, resulting in waste. At the same time, the above dust removal methods all use bag dust collectors. When dealing with the water-containing flue gas generated by hydrogen-oxygen cutting, the bags are easily sticky, resulting in poor dust removal effect.

[0007] In view of this, the present invention is proposed. Summary of the invention

[0008] The object of the present invention is to provide an under-machine dust removal and purification system for a multi-stream stainless steel slab continuous casting machine to solve the technical problems raised in the above-mentioned background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A multi-stream stainless steel slab continuous casting machine under-machine dust removal and purification system comprises a continuous casting machine and a flame cutting machine. A plurality of under-machine dust hoods are arranged below the roller equipment of the continuous casting machine. The under-machine dust hoods are arranged on the side walls of the continuous casting slag flushing groove, and the under-machine dust hoods are connected to the dust removal flue in the foundation.

[0011] Preferably, the dust removal flue is provided with a booster fan to overcome the resistance caused by the bends of the underground pipeline and transport the flue gas to the cyclone gravity separator.

[0012] Preferably, under the action of gravity, the water and iron slag mixture in the flue gas in the cyclone gravity separator is sent from the lower part of the cyclone gravity separator to the continuous casting cyclone well or sedimentation tank for further treatment, wherein the iron-oxygen mixture in the flue gas can be recycled. After the water and iron slag mixture are separated in the flue gas in the cyclone gravity separator, it goes upward and enters the bag dust collector for treatment, and is sent to the chimney for discharge after the treatment meets the standards.

[0013] Preferably, the pipes of the dust hood under the machine adopt different cross-sectional sizes, and the cross-sectional sizes gradually increase from both ends of the continuous casting machine to the middle, so as to reasonably distribute the air volume to match the dynamic distribution of the smoke volume generated during cutting.

[0014] Preferably, a plurality of sets of lower-side smoke shields are provided below the continuous casting machine and above the slag flushing groove, and the lower-side smoke shields correspond one-to-one to the lower-side dust hoods.

[0015] Preferably, smoke baffles are provided at both ends of the continuous casting machine.

[0016] Preferably, the smoke shield located at the starting position of slab cutting of the continuous casting machine is a fixed smoke shield, and the smoke shield located at the ending position of slab cutting of the continuous casting machine is a movable smoke shield.

[0017] Preferably, the movable smoke shield is connected to a stroke controller, and the movable smoke shield is driven by a hydraulic cylinder. The stroke controller receives the size signal of the flame cutting machine to control the extension and retraction of the hydraulic cylinder, so that the movable smoke shield is always behind the cutting end point of the slab, and at the same time, the movable smoke shield can match the different cutting lengths of the slab.

[0018] Preferably, the dust removal flue is located in a concrete structure under the continuous casting machine.

[0019] Preferably, the inner wall of the dust removal flue is fully covered with a 10 mm thick stainless steel plate.

[0020] Compared with the prior art, the multi-stream stainless steel slab continuous casting machine under-machine dust removal and purification system proposed by the present invention has the following beneficial effects:

[0021] 1. The present invention adopts the technology of cyclone gravity dust collector + bag dust collector. The former can deal with fixed impurities such as water and slag in the flue gas, and the latter can perform deep ash removal. The combination of the two can meet the requirements of ultra-low emissions.

[0022] 2. The present invention provides a movable smoke shield at the end of the slab cutting position. The movable smoke shield is arranged on the track on the slag flushing groove of the continuous casting machine to gather the diffused smoke so that it can be collected by the dust hood. At the same time, the movable smoke shield is interlocked with the fixed length of the continuous casting machine to ensure that continuous casting billets of different lengths can be used.

[0023] 3. The dust hood under the machine of the present invention is fixed, and the entrance of the hood is enlarged to gather the smoke. Each stream of the continuous casting machine is equipped with a set of dust hoods under the machine, and each set contains 6 to 8 small dust hoods, which are staggered on both sides of the casting stream to meet the requirements of full coverage. The size of the hood varies according to the cutting point position of the fire cutting machine. The amount of smoke at the starting point and the end point of the cutting is small, and the cross-section of the hood and the pipe is small. The amount of smoke at the middle position of the cutting is large, and the cross-section of the hood and the pipe is large.

[0024] 4. The under-machine dust removal system of the present invention adopts a structural form in which the fire cutting machine is on the top, the continuous casting billet is in the middle, and the dust removal cover is on the bottom, so as to avoid the upward movement of iron-containing smoke to damage the fire cutting machine equipment when cutting the stainless steel billet, extend the service life of the equipment, and thus achieve the purpose of improving production efficiency.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A process structure diagram of an under-machine dust removal and purification system for a multi-stream stainless steel slab continuous casting machine provided in an embodiment of the present invention.

[0028] Figure 2 A plan view of an under-machine dust removal hood and a dust removal flue in an under-machine dust removal and purification system for a multi-stream stainless steel slab continuous casting machine provided in an embodiment of the present invention.

[0029] Figure 3An elevational layout diagram of an under-machine dust removal hood and a dust removal flue in an under-machine dust removal and purification system for a multi-stream stainless steel slab continuous casting machine provided in an embodiment of the present invention.

[0030] Figure 4 This is a diagram of the internal structure of a dust removal flue in an under-machine dust removal and purification system of a multi-stream stainless steel slab continuous casting machine provided by an embodiment of the present invention.

[0031] Figure 5 for Figure 3 Middle AA cross section.

[0032] Figure 6 Schematic diagram of the connection between the head and tail cutting box and the dust removal flue in the under-machine dust removal purification system of a multi-stream stainless steel slab continuous casting machine provided by an embodiment of the present invention

[0033] The diagram is as follows:

[0034] 1. Flame cutting machine; 2. Mobile smoke shield; 3. Dust hood under the machine; 4. Dust removal flue; 5. Fixed smoke shield; 6. Booster fan; 7. Cyclone gravity separator; 8. Bag dust collector; 9. Chimney; 10. Slab; 11. Smoke shield under the machine; 12. Continuous casting swirl well; 13. Stroke controller; 14. Hydraulic cylinder; 15. Slag flushing groove; 16. Stainless steel plate; 17. Head and tail cutting box. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0036] like Figure 1-5 As shown, an embodiment of the present invention provides an under-machine dust removal and purification system for a multi-stream stainless steel slab continuous casting machine, including a continuous casting machine and a flame cutting machine 1, wherein a plurality of under-machine dust hoods 3 are arranged below the continuous casting machine, wherein the under-machine dust hoods 3 are staggeredly arranged on the side walls of the slag flushing groove 15, and the under-machine dust hoods 3 are connected to the dust removal flue 4. In the present invention, the under-machine dust hoods 3 are staggeredly arranged so that the under-machine dust hoods 3 cover the entire cutting range, better collect smoke, and avoid the influence of mutual convection between the under-machine dust hoods 3.

[0037] In the above-mentioned embodiment of the present invention, a fixed smoke baffle 5 is arranged horizontally at the starting position of the cutting of the slab 10, and the fixed smoke baffle 5 is arranged vertically above the slag flushing groove 15 of the continuous casting machine. The fixed smoke baffle is inclined along the moving direction of the slab 10, so that the diffused smoke is gathered and flows to the dust hood 3 under the machine so as to be collected by the dust hood.

[0038] Since the fixed lengths of the slabs 10 are different, the cutting end point of the flame cutting machine 1 is not a fixed value. Therefore, a movable smoke shield 2 is arranged at the cutting end point of the slab 10 in the horizontal direction. The movable smoke shield 2 is arranged vertically above the slag flushing groove 15 of the continuous casting machine. The movable smoke shield 2 is tilted in the opposite direction of the movement of the slab 10, so that the diffused smoke is gathered and flows to the dust hood 3 under the machine for collection by the dust hood. The movable smoke shield 2 is driven by a hydraulic cylinder 14 and is equipped with a stroke controller 13, which is interlocked with the fixed length signal of the flame cutting machine 1. When the flame cutting machine 1 receives the fixed length signal, the hydraulic cylinder 14 is controlled to extend and retract, so that the movable smoke shield 2 is always behind the cutting end point. Since the fixed length of the slab 10 is generally a fixed value such as 3, 6, 9, 12, etc., the displacement of the movable smoke shield 2 can be controlled by gear positions, and each gear corresponds to one fixed length.

[0039] In the above embodiment of the present invention, the lower smoke shield 11 is arranged below the continuous casting machine, above the lower dust hood 3, and on both sides of the casting strand centerline to gather the generated smoke so that the lower dust hood 3 can collect it.

[0040] In the above-mentioned embodiment of the present invention, the dust removal flue 4 conveys the flue gas to the cyclone gravity separator 7 through the booster fan 6. Under the action of gravity, the water and iron slag mixture of the flue gas in the cyclone gravity separator 7 is sent from the lower part of the cyclone gravity separator 7 to the continuous casting vortex well 12 or the sedimentation tank for further treatment. After the water and iron slag mixture are separated, the flue gas in the cyclone gravity separator 7 goes up and enters the bag filter 8 for treatment. After the treatment meets the standards, it is sent to the chimney 9 for discharge. The present invention adopts the process of cyclone gravity dust collector + bag filter 8. The former can treat fixed impurities such as water and slag in the flue gas, and can be recycled and reused after collecting iron powder. The latter can perform deep ash removal. The combination of the two can meet the requirements of ultra-low emissions.

[0041] In the above embodiment of the present invention, the pipe cross section of the under-machine dust hood 3 increases from both ends of the continuous casting machine to the middle. A plurality of under-machine side smoke shields 11 are arranged below the continuous casting machine and above the slag flushing groove 15, and the under-machine side smoke shields 11 correspond to the under-machine dust hood 3 one by one.

[0042] After continuous casting, the stainless steel slab 10 is sent out of the fan-shaped section and enters the cutting area. The flame cutting machine 1 cuts from both sides of the slab 10 to the middle and starts to generate smoke. As the cutting goes deeper, the amount of smoke gradually increases. When the cutting is halfway done, the amount of smoke is the largest. At the same time, the dust hood 3 under the machine is fixed, and the entrance of the hood is enlarged for easy air suction. Each stream of the continuous casting machine is equipped with 3 sets of dust hoods under the machine, each set contains 6 to 8 small dust hoods, which are distributed on both sides of the casting stream. The size of the hood varies according to the cutting point of the flame cutting machine. The amount of smoke at the starting point and end point of the cutting is small, and the cross-section of the hood and the pipe is small. The amount of smoke in the middle of the cutting is large, and the cross-section of the hood and the pipe is large.

[0043] In the above embodiment of the present invention, the dust removal flue 4 is located in the concrete structure under the continuous casting machine. The inner wall of the dust removal flue 4 is fully covered with a 10 mm thick stainless steel plate 16. Since the dust removal flue 4 is under the continuous casting machine, the flue adopts a concrete structure for corrosion prevention; in order to reduce the emission resistance of the flue gas, the inner wall of the flue is fully covered with a 10 mm thick stainless steel plate 16. The elevation of the flue is determined according to the slag flushing ditch 15 where the flue is located, and the top plate of the flue serves as the top plate of the slag flushing ditch 15 of the continuous casting machine.

[0044] like Figure 6 As shown, in a multi-stream stainless steel slab continuous casting machine under-machine dust removal and purification system provided by an embodiment of the present invention, the original inherent structure of the continuous casting machine body is fully combined, and the elevation of the dust removal flue 4 is connected to the head and tail cutting collection box 17 of the original inherent structure of the continuous casting machine, and personnel can enter the dust removal flue 4 from the head and tail cutting collection box 17 through the aisle, which is convenient for maintenance and repair in the dust removal flue 4. In addition, the present invention is provided with a sump at the lowest point of the flue after the dust removal flue 4 is collected, and a self-starting submersible pump is built in the sump to ensure that the water in the flue is discharged in time.

[0045] The specific working mode of the present invention is as follows: the flame cutting machine 1 moves with the slab 10 while performing the cutting operation. A large amount of flue gas containing iron slag is generated during the cutting process. The flue gas (at this time, the flue gas contains a small amount of water and iron slag) moves toward the lower part of the slab 10 under the action of the airflow of the flame cutting machine 1 spray gun, and is collected by the under-machine dust removal hood 3 under the continuous casting machine track, and is aggregated into the dust removal flue 4 and then sent to the cyclone gravity separator 7 by the booster fan 6, wherein the water and iron slag mixture in the flue gas is deposited at the lower part under the action of gravity, and is sent to the continuous casting cyclone well 12 / sedimentation tank for treatment. After the flue gas is separated, it goes up and enters the bag filter 8. The flue gas that meets the standards is discharged to the atmosphere through the chimney 9.

[0046] The effective effects of the present invention are specifically as follows:

[0047] 1. The dust removal pipeline is placed under the continuous casting machine, which does not take up space and is convenient for the inspection and maintenance of the continuous casting equipment;

[0048] 2. The dust hood 3 under the machine is close to the smoke generating point, so the air suction effect is good. When the same dust removal efficiency is achieved, the motor power to be used is small;

[0049] 3. The flue gas containing iron powder does not pass through the flame cutting machine 1, which greatly extends the service life of the equipment and reduces the occupational diseases caused by the on-site personnel exposed to the flue gas;

[0050] 4. Iron powder can be recycled after collection;

[0051] 5. Equipped with a dehumidifier, it can handle the water-containing fume generated by hydrogen-oxygen cutting;

[0052] 6. Since the dust removal system is underground, a conventional on-machine dust removal cover can still be set on the ground. For special environments, the on-machine + off-machine mode can be adopted. The on-machine dust removal system can be used without spraying iron powder, which has a wider applicability;

[0053] 7. A wide-mouthed smoke baffle is provided below the flame cutting machine 1 and on both sides of the casting strand to collect the smoke.

[0054] 8. The dust hoods under each flow are arranged in a staggered manner on both sides to cover the entire cutting process and absorb smoke to the greatest extent.

[0055] 9. At present, the length determination method of continuous casting billets mostly adopts infrared cameras, and the accuracy will be affected by smoke and dust hoods, thus reducing the accuracy. The dust removal duct of this system is located at the bottom, and the fire cutting machine equipment is in the open space of the factory. When the infrared camera is used to position the continuous casting billet, it is not affected by smoke and hoods, making the positioning more accurate.

[0056] 10. The present invention is better at handling the smoke of stainless steel, because the smoke contains iron powder when stainless steel is cut. Compared with conventional smoke, the smoke containing iron powder has a great influence on the fire cutting machine and the bag dust collector. The iron powder may generate sparks and burn the bags in the bag dust collector due to friction. Therefore, the traditional bag dust removal process has hidden dangers. Therefore, the present invention adopts a structural form in which the fire cutting machine is on the top, the continuous casting billet is in the middle, and the dust collector hood is on the bottom to avoid the upward movement of iron powder-containing smoke to damage the fire cutting machine equipment when the stainless steel billet is cut, thereby extending the service life of the equipment and achieving the purpose of improving production efficiency.

[0057] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0058] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0059] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A multi-stream stainless steel slab continuous casting machine under-machine dust removal and purification system, characterized in that: It comprises a continuous casting machine and a flame cutting machine. A plurality of sets of under-machine dust removal covers are arranged below the continuous casting machine. The under-machine dust removal covers are staggeredly arranged on the side walls of the slag flushing grooves and are connected with dust removal flues.

2. The multi-stream stainless steel slab continuous casting machine under-machine dust removal and purification system according to claim 1, characterized in that: The dust removal flue is provided with a booster fan, which overcomes the resistance caused by the bends of the underground pipeline and transports the flue gas to the cyclone gravity separator.

3. The multi-stream stainless steel slab continuous casting machine under-machine dust removal and purification system according to claim 2, characterized in that: Under the action of gravity, the water and iron slag mixture in the flue gas in the cyclone gravity separator is sent from the lower part of the cyclone gravity separator to the continuous casting cyclone well or sedimentation tank for further treatment. After the water and iron slag mixture are separated in the flue gas in the cyclone gravity separator, it goes upward and enters the bag dust collector for treatment. After the treatment meets the standards, it is sent to the chimney for discharge.

4. The under-machine dust removal and purification system of a multi-stream stainless steel slab continuous casting machine according to claim 3 is characterized in that: The pipe cross section of the under-machine dust removal cover increases continuously from both ends of the continuous casting machine toward the middle.

5. The multi-stream stainless steel slab continuous casting machine under-machine dust removal and purification system according to claim 4, characterized in that: A plurality of sets of machine lower side smoke shields are arranged below the continuous casting machine and above the slag flushing groove, and the machine lower side smoke shields correspond one to one with the machine lower dust removal hoods.

6. The multi-stream stainless steel slab continuous casting machine under-machine dust removal and purification system according to claim 5, characterized in that: Smoke baffles are arranged at both ends of the continuous casting machine.

7. The under-machine dust removal and purification system of a multi-stream stainless steel slab continuous casting machine according to claim 6, characterized in that: The smoke shield located at the starting position of slab cutting of the continuous casting machine is a fixed smoke shield, and the smoke shield located at the ending position of slab cutting of the continuous casting machine is a movable smoke shield.

8. The under-machine dust removal and purification system for a multi-stream stainless steel slab continuous casting machine according to claim 7, characterized in that: The movable smoke shield is connected to a stroke controller and driven by a hydraulic cylinder. The stroke controller receives a size signal from the flame cutting machine to control the extension and retraction of the hydraulic cylinder so that the movable smoke shield is always behind the cutting end of the slab.

9. The under-machine dust removal and purification system for a multi-stream stainless steel slab continuous casting machine according to claim 8, characterized in that: The dust removal flue is located in a concrete structure under the continuous casting machine.

10. The under-machine dust removal and purification system of a multi-stream stainless steel slab continuous casting machine according to claim 9, characterized in that: The inner wall of the dust removal flue is fully covered with a 10 mm thick stainless steel plate.

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