CN113528744A - Continuous preheating system for converter scrap steel - Google Patents
Continuous preheating system for converter scrap steel Download PDFInfo
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- CN113528744A CN113528744A CN202010295382.0A CN202010295382A CN113528744A CN 113528744 A CN113528744 A CN 113528744A CN 202010295382 A CN202010295382 A CN 202010295382A CN 113528744 A CN113528744 A CN 113528744A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 117
- 239000010959 steel Substances 0.000 title claims abstract description 117
- 239000000779 smoke Substances 0.000 claims abstract description 116
- 238000010438 heat treatment Methods 0.000 claims abstract description 89
- 238000007789 sealing Methods 0.000 claims abstract description 48
- 238000010521 absorption reaction Methods 0.000 claims abstract description 14
- 239000002699 waste material Substances 0.000 claims description 34
- 229910001220 stainless steel Inorganic materials 0.000 claims description 30
- 239000010935 stainless steel Substances 0.000 claims description 30
- 230000007246 mechanism Effects 0.000 claims description 12
- 239000003517 fume Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 18
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000003723 Smelting Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 16
- 238000007599 discharging Methods 0.000 description 9
- 239000000428 dust Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 238000011068 loading method Methods 0.000 description 6
- 230000033764 rhythmic process Effects 0.000 description 6
- 210000001503 joint Anatomy 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000391 smoking effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010017740 Gas poisoning Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/466—Charging device for converters
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
- C21C5/565—Preheating of scrap
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Details (AREA)
Abstract
The invention relates to the technical field of steel smelting, in particular to a converter scrap steel continuous preheating system. The system comprises: scrap hopper, rail, flatcar, hood, heating device and sealing strip; the bottom of the scrap steel hopper is provided with a plurality of smoke exhaust branch pipes, and the tail ends of the smoke exhaust branch pipes form smoke outlets arranged along the horizontal direction; the track is arranged on the feeding span and is arranged along the transverse direction of the feeding span; a hoisting position and a heating position are formed on the track; the flat car is arranged on the track, and the traveling direction of the flat car is vertical to the direction of the car body; the smoke hood is arranged at the heating position and is provided with an inlet and an outlet for the flat car and the scrap steel hopper to enter and exit; the smoke hood is provided with a plurality of smoke absorption pipelines, and the smoke absorption ports of the smoke absorption pipelines are conical ports with the inner diameters gradually reduced from outside to inside; the heating device is provided with a plurality of burners arranged along the length direction of the scrap steel hopper, and the burners are arranged at the top of the smoke hood; the upper end of the sealing strip is hinged on the top end of the inlet and the outlet. The preheating system has the advantages of high production efficiency, low pollution and low production cost.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a converter scrap steel continuous preheating system.
Background
In recent years, with the rapid development of economy in China, the problem of restriction of energy shortage on economy is more remarkable, and especially in the field of steel smelting, attention is paid to energy conservation and emission reduction. In the metallurgical industry, there are two main sources of steel-making raw materials, namely molten iron and scrap steel. The scrap steel belongs to recycling resources, and therefore, the method has the advantage of low cost compared with molten iron. Therefore, steel plants are advocated to improve the scrap ratio as much as possible during smelting, which is not only beneficial to protecting resources, but also beneficial to saving energy, reducing environmental pollution and promoting the sustainable development of resources.
At present, the utilization modes of converter scrap steel include the following two modes:
1) directly using an electromagnetic crane from the feeding span, adding the classified scrap steel stored in the scrap steel area of the feeding span into a scrap steel hopper, and adding the scrap steel into a rotor by using a special scrap steel hopper crane of the feeding span. The disadvantages of this method are: a special scrap steel treatment workshop is not provided, and the requirement on storage of a converter feeding span is high; the operation of loading and unloading the scrap steel is carried out in a workshop, and the dust is serious; the transportation, loading, unloading, classification and hoisting of the scrap steel are centralized in a steelmaking workshop, the coordination requirement on the production rhythm is higher, the production scheduling difficulty is also high, the adding amount of the scrap steel is greatly increased for large-sized and super-large-sized converters, particularly for the converters with the improved scrap steel ratio, and the original mode is difficult to adapt to the production rhythm requirement.
2) The sorted scrap steel stored in the scrap steel feeding cross-over area is fed into a receiving end of the conveyor from the form of feeding cross-construction of the scrap steel continuous conveyor, a ladle-baking burner is arranged at the upper part of the conveyor, and flame heating is carried out along with the process of conveying the scrap steel by the conveyor. The disadvantages of this method are: like the method, a special scrap steel treatment workshop is not provided, the material storage requirement of the charging span of the converter is high, and the scrap steel loading and unloading operation is carried out in the workshop, so that the dust is serious; in addition, the heating completely depends on the flame heating of the burner, concentrated smoke discharge and dust removal cannot be performed, the environment is poor, the smoke is easy to overflow, the utilization rate of coal gas is low, the whole heating process is not closed, and the coal gas is easy to leak to cause coal gas poisoning; meanwhile, the integral heating uniformity is poor, the heating temperature difference of the scrap steel in different areas is obvious, the hot material is directly discharged during discharging, and the hot smoke overflows and is difficult to collect in a centralized manner.
Disclosure of Invention
In order to solve the technical problems, the invention provides a continuous preheating system for converter scrap.
The invention provides a continuous preheating system for converter scrap steel, which comprises: scrap hopper, rail, flatcar, hood, heating device and sealing strip; wherein the content of the first and second substances,
the bottom of the scrap steel hopper is provided with a plurality of smoke exhaust branch pipes, and the tail ends of the smoke exhaust branch pipes form smoke outlets arranged along the horizontal direction;
the track is arranged on the charging span and is arranged along the transverse direction of the charging span; a hoisting position and a heating position are formed on the track;
the flat car is arranged on the track and can move between the hoisting position and the heating position, and the traveling direction of the flat car is vertical to the direction of a car body; the top of the flat car is used for supporting a scrap steel hopper;
the smoke hood is arranged at the heating position, and an inlet and an outlet for the flat car and the waste steel hopper to enter and exit are formed in one of two sides of the smoke hood along the track direction, which is close to the hoisting position; the smoke hood is provided with a plurality of smoke absorption pipelines, smoke absorption ports of the smoke absorption pipelines are conical ports with the inner diameters gradually reduced from outside to inside, the smoke absorption ports correspond to smoke exhaust ports of the waste steel hoppers at the tops of the flat cars at the heating positions, and the outer diameters of the smoke exhaust ports are between the maximum inner diameter and the minimum inner diameter of the smoke absorption ports;
the heating device is provided with a plurality of burners arranged along the length direction of the waste steel hopper, and the burners are arranged at the top of the smoke hood;
the upper end of the sealing band is hinged on the top end of the inlet and the outlet, and the sealing band has two working states: in the open state, the vertical distance from the lower end of the hopper to the ground is greater than the vertical distance from the top end of the scrap hopper positioned at the top of the flat car to the ground; in the closed state, the vertical distance from the lower end of the scrap hopper to the ground is smaller than the vertical distance from the top end of the scrap hopper positioned at the top of the flat car to the ground.
Further, the continuous preheating system for converter scrap further comprises: the distance sensor is used for acquiring the position information of the flat car, and the flat car is provided with a stroke controller which is connected with the distance sensor and used for controlling the wheel rotating speed of the flat car according to the position information.
Furthermore, the distance sensor is a laser positioning instrument, and a stainless steel reflecting plate arranged along the vertical direction is arranged on the flat car; and a laser emitting head of the laser positioning instrument and the stainless steel reflecting plate are oppositely arranged along the direction parallel to the track.
Furthermore, the converter scrap steel continuous preheating system further comprises a travel switch, and a collision block matched with the travel switch is arranged at the bottom of the body of the flat car.
Furthermore, the smoke exhaust branch pipe is of a bent pipe structure, one end of the smoke exhaust branch pipe is communicated with the interior of the scrap steel hopper, and the other end of the smoke exhaust branch pipe forms the smoke exhaust port.
Further, the converter scrap steel continuous preheating system also comprises a heat exchanger which is arranged between the smoke suction pipeline and the heating device.
Furthermore, a plurality of hoisting positions and heating positions are formed on the track, and one or two heating positions are arranged between the adjacent hoisting positions.
Further, the sealing tape comprises: the device comprises a rotating shaft, a connecting plate, a driving mechanism and a plurality of stainless steel plates; the rotating shaft is hinged to the top end of the inlet and the outlet, the connecting plate is welded to the rotating shaft, the stainless steel plates are fixed to the connecting plate, and the adjacent stainless steel plates are arranged in an overlapping mode; the driving mechanism is connected with the rotating shaft and used for driving the rotating shaft to rotate by a preset angle.
Further, the stainless steel plates are all screwed on the connecting plate.
Furthermore, the driving mechanism is an electro-hydraulic push rod, a rotating arm is arranged on the rotating shaft, and the telescopic end of the electro-hydraulic push rod is connected with the tail end of the rotating arm.
Compared with the prior art, the continuous preheating system for the converter scrap steel provided by the invention has the following advantages:
1. the preheating system directly uses the scrap steel hopper as a heating container to heat the scrap steel, and compared with the heating mode of the traditional continuous conveyor, the preheating system reduces the processes of discharging, loading and discharging the scrap steel once, reduces the consumption, the labor consumption and the pollution, and improves the production efficiency.
2. This system of preheating sets up in reinforced striding to the track is along the transversal arrangement of reinforced striding, and the spare area in the reinforced interior of striding of abundant reasonable utilization from this need not additionally to add the space, reduction in production cost from this.
3. The flat car is adopted to transversely convey the waste steel hopper, on one hand, the flat car has a simple mechanical structure and is easy to operate, the energy medium and spare parts are less consumed, the transportation mode is mature and reliable, the conveying speed is high, the flat car speed can be accurately controlled, the initial position can be accurately controlled, the heating rhythm of the heating position burner is further accurately matched, the burner flame is prevented from directly heating the waste steel hopper, and the service life of the waste steel hopper is prolonged; on the other hand, the transverse conveying can reduce the occupation of longitudinal space in the feeding span and increase the number of heating positions arranged on the track so as to adapt to the production rhythm of large-scale and extra-large-scale converters.
4. The sealing belt and the waste steel hopper are movably sealed, and the conical smoke suction port of the smoke suction pipeline and the smoke discharge port of the waste steel hopper are in butt joint sealing, so that smoke dust can be discharged in a centralized sealing mode during heating, the smoke dust is prevented from overflowing, and the waste steel hopper is not influenced to move along with the flat car.
In conclusion, the continuous preheating system for the converter scrap steel has the advantages of high production efficiency, low pollution and low production cost.
Drawings
FIG. 1 is a front view of a continuous preheating system for converter scrap according to an embodiment of the present invention;
FIG. 2 is a schematic perspective view of a scrap hopper in a continuous preheating system for converter scrap according to an embodiment of the present invention;
FIG. 3 is a schematic sectional view of a scrap hopper of a continuous preheating system for converter scrap according to an embodiment of the present invention;
FIG. 4 is a top view of a track in a continuous preheating system for converter scrap according to an embodiment of the present invention;
FIG. 5 is a schematic view showing a state in which an exhaust port of a scrap hopper and a smoke suction port of a smoke suction pipe of a continuous preheating system for scrap of a converter according to an embodiment of the present invention are butted against each other;
FIG. 6 is a front view of a sealing strip in a continuous preheating system for converter scrap according to an embodiment of the present invention.
Description of the reference numerals
1-scrap hopper
11-Smoke exhaust branch pipe
12-smoke outlet
13-lifting lug
2-track
21-hoisting position
22-heating position
3-platform wagon
4-smoke hood
41-smoking mouth
5-heating means
51-burner
6-sealing tape
61-rotating shaft
62-connecting plate
63-stainless steel plate
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be noted that, in the case of no conflict, the features in the following embodiments and examples may be combined with each other; moreover, all other embodiments that can be derived by one of ordinary skill in the art from the embodiments disclosed herein without making any creative effort fall within the scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
In a specific embodiment, the present invention provides a continuous preheating system for converter scrap, referring to fig. 1, comprising: the device comprises a scrap steel hopper 1, a track 2, a flat car 3, a smoke hood 4, a heating device 5 and a sealing belt 6; wherein the content of the first and second substances,
referring to fig. 2 and 3, a plurality of smoke exhaust branch pipes 11 are arranged at the bottom of the scrap hopper 1, and the tail ends of the smoke exhaust branch pipes 11 form smoke exhaust ports 12 arranged along the horizontal direction; lifting lugs 13 which can be lifted by a crane are arranged on two sides of the scrap steel hopper 1;
referring to fig. 4, the track 2 is disposed on the charging bay, and is arranged along the transverse direction of the charging bay; a hoisting position 21 and a heating position 22 are formed on the track 2; in fig. 4, the dashed line frame is the position of the hoisting position 21, and the solid line frame is the position of the heating position 22, and for the convenience of understanding, the flat wagon and the scrap hopper 1 positioned at the hoisting position 21 and the heating position 22 are also shown in the figure;
the flat car 3 is arranged on the track 2 and can move between the hoisting position 21 and the heating position 22, and the travelling direction of the flat car 3 is vertical to the direction of a car body; the top of the flat car 3 is used for supporting the scrap steel hopper 1;
the smoke hood 4 is covered on the heating position 22, and one side of two sides of the smoke hood 4 along the direction of the track 2, which is close to the hoisting position 21, is provided with an inlet and an outlet for the flat car 3 and the waste steel hopper 1 to go in and out; the fume hood 4 is provided with a plurality of fume suction pipes, please refer to fig. 5, the fume suction ports 41 of the fume suction pipes are conical ports with the inner diameter gradually decreasing from outside to inside, the positions of the fume suction ports 41 correspond to the fume discharge ports 12 of the scrap steel hoppers 1 at the tops of the flatcars 3 at the heating positions 22, and the outer diameters of the fume discharge ports 12 are between the maximum inner diameter and the minimum inner diameter of the fume suction ports 41;
the heating device 5 is provided with a plurality of burners 51 arranged along the length direction of the scrap steel hopper 1; the burner nozzle 51 is arranged at the top of the smoke cover 4;
the upper end of the sealing strip 6 is hinged on the top end of the access opening, and the sealing strip 6 has two working states: in the open state, the vertical distance from the lower end of the hopper to the ground is larger than the vertical distance from the top end of the scrap hopper 1 positioned at the top of the flat car 3 to the ground; in the closed state (i.e., the state shown in FIG. 1), the vertical distance from the lower end to the ground is smaller than the vertical distance from the top end of the scrap hopper 1 located on the top of the flatcar 3 to the ground.
The process for heating the steel scrap by adopting the converter steel scrap continuous preheating system provided by the embodiment of the invention comprises the following steps:
1) transporting the charged scrap hopper 1 to a steelmaking workshop charging bay; the flat car 3 is in place at the hoisting position 21; the crane hoists the scrap steel hopper 1 to the top of the flat car 3;
2) the sealing strip 6 at the inlet and outlet of the smoke hood 4 is in an open state, and the flat wagon 3 moves into the smoke hood 4 and is in place at the heating position 22; at the moment, the burner 51 is positioned right above the waste steel hopper 1, and the smoke outlet 12 of the waste steel hopper 1 is inserted into the smoke suction port 41 of the smoke suction pipeline for butt joint and sealing;
3) sealing a sealing belt 6, wherein the sealing belt 6 seals the area above the scrap hopper 1; starting the heating device 5, and heating the waste steel material in the waste steel hopper 1 by the burner 51;
4) after heating is finished, the heating device 5 is closed; and (3) opening the sealing belt 6, returning the flat car 3 to a hoisting position 21, and hoisting and conveying the heated scrap hopper 1 to the converter by the crane.
In the continuous preheating system for converter scrap steel:
the scrap hopper 1 is both a carrier for transporting scrap and a heating container. The scrap steel hopper 1 is lifted to the top of the flat car 3 by a crane after being charged, and lifting lugs 13 for lifting by the crane can be arranged on two sides of the scrap steel hopper for lifting. The bottom of the scrap steel hopper 1 is provided with a plurality of smoke exhaust branch pipes 11 which are used for being matched with the smoke exhaust port 41 and discharging smoke generated in the process of heating the scrap steel through a smoke exhaust pipeline so as to prevent the smoke from overflowing. Preferably, referring to fig. 3, the smoke exhaust branch pipe 11 is of a bent pipe structure, one end of which is communicated with the inside of the scrap steel hopper 1, and the other end of which forms the smoke exhaust port 12. Further, the smoke exhaust branch pipe 11 is an L-shaped branch pipe. In the continuous converter scrap preheating system provided by the invention, the scrap hopper 1 is directly used as a heating container to heat the scrap, and compared with the heating mode of the conventional continuous conveyor, the continuous converter scrap preheating system reduces the processes of discharging, loading and discharging the scrap once, reduces the consumption, reduces the manpower consumption, reduces the pollution and improves the production efficiency.
The track 2 is arranged on the feeding span, namely, a converter scrap continuous preheating system is arranged in an idle area in the feeding span, and extra space does not need to be additionally arranged. A hoisting position 21 and a heating position 22 are formed on the rail 2, wherein the hoisting position 21 is a position where the waste steel hopper 1 is hoisted into or out of the flat car 3 by a crane, and the heating position 22 is a position where the waste steel in the waste steel hopper 1 on the flat car 3 is heated. In the present invention, the reason why the track 2 is designed to be arranged along the transverse direction of the charging bay is that: at present, the charging span is generally large in transverse space (generally 80 to 100m from the converter platform to the wall axis) and small in longitudinal space (generally 24m in longitudinal span), so that the rails 2 are arranged transversely along the charging span, and reasonable space is utilized fully. Furthermore, a plurality of hoisting positions 21 and heating positions 22 are arranged on the track 2, and one or two heating positions 22 are arranged between the adjacent hoisting positions 21. Therefore, on one hand, the number of the waste steel hoppers capable of being heated in unit time can be increased, and the production efficiency is improved; on the other hand, heating positions are arranged on two sides of a part of the hoisting position in the mode and can respectively enter the two heating positions for baking, namely the two heating positions can share one hoisting position, and the space is further saved. In this embodiment, the track 2 is provided with four hoisting positions 21 and five heating positions 22, and the arrangement mode is as follows: hoisting position-heating position-hoisting position.
The platform wagon 3 is a transportation mechanism for the scrap, which is used for transporting the scrap hopper 1 along the transverse direction of the rail 2. Specifically, the top of the scrap steel container is used for supporting the scrap steel container 1, and a container limiting mechanism can be arranged on the top of the scrap steel container to prevent the scrap steel container 1 from moving in the transportation process. The flat car 3 can move between a hoisting position 21 and a heating position 22 of the track 2, and when the hoisting position 21 is in place, the crane hoists the waste steel hopper 1 to be heated to the top of the flat car 3 or hoists the heated waste steel hopper 1 out; in the heating station 22, a flatcar is used to transport the scrap hopper 1 under the burners 51. Compared with hydraulic stepping conveying, the conventional scrap steel hopper conveying mostly adopts a hydraulic stepping conveyor, the scrap steel hopper conveying system adopts a flat car for conveying, the vertical space occupation is small, the mechanical structure is simple and easy to operate, the energy medium and spare parts are low in consumption, the conveying mode is mature and reliable, the conveying speed is high, the flat car speed can be accurately controlled, the starting position can be accurately controlled, the heating rhythm of the burner nozzle 51 of the heating position 22 is accurately matched, the condition that the flame of the burner nozzle 51 directly heats the scrap steel hopper is avoided, and the service life of the scrap steel hopper is prolonged. Compared with the existing flat car, the travelling direction of the flat car 3 adopted by the invention is vertical to the car body direction, so that the number of the heating positions 22 arranged on the track 2 can be increased, and the production efficiency is improved.
In order to facilitate the control of the start-stop position of the flat car 3, so that the flat car can be automatically and accurately stopped on the hoisting position 21 (the hoisting position is aligned with the top surface of the flat car 3) and the heating position 22 (the burner 51 corresponds to the scrap steel hopper 1, and the smoke outlet 12 is in sealed butt joint with the smoke suction port 41), the continuous converter scrap steel preheating system provided by the preferred embodiment of the invention further comprises: the distance sensor is used for acquiring the position information of the flat car 3, and a stroke controller is arranged on the flat car 3, is connected with the position sensor and is used for controlling the wheel rotating speed of the flat car 3 according to the position information. The position sensor can adopt an ultrasonic sensor, a laser locator, an infrared sensor or a radar and the like; preferably, the embodiment of the present invention adopts the following manner: the position sensor adopts a laser positioning instrument, and a stainless steel reflecting plate arranged along the vertical direction is arranged on the flatcar 3; the laser emitting head of the laser locator and the stainless steel reflector are arranged oppositely along the direction parallel to the track 2. Laser emitted by a laser emitting head of the laser positioning instrument is reflected by a stainless steel reflector and then received by a laser receiving device, a position signal is fed back, and a stroke controller controls the wheel rotating speed of the flat car 3 according to the position signal, so that the flat car can be automatically and accurately stopped on the hoisting position 21 or the heating position 22. The laser positioning device may be arranged on the outer side of the track 2.
Another preferred way of controlling the start-stop position of the flatcar is as follows: the converter scrap steel continuous preheating system also comprises a travel switch, and the bottom of the body of the flat car 3 is provided with a collision block matched with the travel switch. When the collision block of the flat car 3 impacts the travel switch, the travel switch acts to correspondingly cut off or switch on the transmission system of the flat car 3, thereby controlling the starting or stopping of the flat car 3. The travel switch may be mounted on the outside of the rail or on the rail.
The smoke hood 4 is arranged on the heating position 22 and used for isolating the scrap steel hopper 1 from the outside, so that smoke generated in the heating process is conveniently concentrated and discharged, and the environment pollution caused by the smoke is avoided. The smoke hood 4 can be made of profile steel and refractory materials. The smoke hood 4 is provided with an inlet and an outlet for the flat car 3 and the scrap steel hopper 1 to enter and exit, and the smoke hood 4 is internally provided with a burner 51 and a smoke absorbing pipeline. The burner 51 is installed at the top of petticoat pipe 4, and a plurality of burners 51 are arranged along scrap steel hopper 1 length direction, and burner 51 is used for heating the scrap steel material in the scrap steel hopper 1. As will be appreciated by those skilled in the art: the burners 51 are located directly above the scrap hopper 1 at the top of the platform 3 at the heating station 22, and the skilled person can select the number and arrangement of the burners according to the specific working conditions. Preferably, the distance from the burner 51 to the top surface of the scrap hopper 1 is 400 to 1000 mm.
A plurality of smoke absorbing pipelines are arranged in the smoke hood 4, are butted with a smoke outlet 12 of the scrap steel hopper 1 and are used for intensively discharging smoke generated in the heating process, and are matched with a sealing strip 6 to realize the effect of preventing the smoke from overflowing. The smoke absorbing pipes are collected and then connected to a dust remover of the refining furnace for post-treatment. In the embodiment of the invention, the smoking port 41 is a conical port, and the inner diameter of the smoking port is gradually reduced from outside to inside; accordingly, the outer diameter of the smoke outlet 12 is between the maximum inner diameter and the minimum inner diameter of the smoke outlet 41. Therefore, the sealed butt joint of the smoke outlet 12 and the smoke suction port 41 can be realized, and the movement of the smoke outlet 12 along with the flat car 3 is not influenced. As for the specific arrangement mode of the smoke outlet 12 and the smoke suction port 41, a person skilled in the art can select the arrangement mode according to specific working conditions, in this embodiment, five smoke outlets 12 (five smoke discharge branch pipes 11) are arranged at the bottom of the scrap steel hopper 1, and five smoke suction ports 41 (five smoke suction pipes) are correspondingly arranged in the smoke hood 4.
The sealing belt 6 is used for sealing the area above the waste steel hopper 1 in the process of heating the waste steel materials, and is matched with the smoke absorption pipeline to achieve the effect of preventing smoke dust from overflowing. Compared with the traditional sealing structure, the sealing strip 6 required by the embodiment of the invention not only meets the sealing function, but also cannot influence the flat car 3 and the waste steel hopper 1 to enter and exit the smoke hood 4. Thus, in the present embodiment, the upper end of the seal band 6 is hinged to the top end of the inlet and outlet of the hood 4, that is, the seal band 6 can be rotated in the vertical direction. The sealing strip 6 has two operating states: in an opening state, the vertical distance from the lower end of the sealing strip to the ground is greater than the vertical distance from the top end of the waste steel hopper 1 positioned at the top of the flat car 3 to the ground, and at the moment, the sealing strip 6 is in a non-sealing state, so that the sealing strip is suitable for a process of enabling the flat car 3 to go in and out of the smoke hood 4, and at the moment, the sealing strip is not in a heating state, smoke cannot be generated, and the flat car 3 and the waste steel hopper 1 can freely go in and out of the smoke hood 4; under the closed state, the vertical distance from the lower end of the flat wagon to the ground is smaller than the vertical distance from the top end of the scrap steel hopper 1 positioned at the top of the flat wagon 3 to the ground, the flat wagon 3 is suitable for being heated, smoke can be generated at the moment, the flat wagon 3 is in a static state in the smoke hood 4, and the sealing strip 6 is in a sealing state at the moment, so that the smoke can be prevented from overflowing.
Referring to fig. 6, as a preferred embodiment of the present invention, the sealing tape 6 includes: a rotating shaft 61, a connecting plate 62, a driving mechanism and a plurality of stainless steel plates 63; the rotating shaft 61 is hinged to the top end of the inlet and outlet, the connecting plate 62 is welded to the rotating shaft 61, the stainless steel plates 63 are fixed on the connecting plate 62, and the adjacent stainless steel plates 63 are arranged in an overlapping mode; the driving mechanism is connected with the rotating shaft 61 and used for driving the rotating shaft 61 to rotate by a preset angle. In the structure of the sealing belt 6, a rotating shaft 61 is fixedly connected with a plurality of stainless steel plates 63 through a connecting plate 62, and a driving mechanism drives the plurality of stainless steel plates 63 to rotate together by driving the rotating shaft 61 to rotate, so that the sealing belt 6 is opened and closed. In this embodiment, the stainless steel plates 63 arranged in an overlapping manner are used as the sealing member, which has the following advantages: 1) the stainless steel plate has excellent heat resistance and can adapt to a high-temperature baking environment; 2) the plurality of stainless steel plates are combined for use, so that the whole sealing structure has certain flexibility, and the sealing effect is improved by matching the overlapping arrangement of the adjacent sealing plates; 3) during maintenance, only part of the stainless steel plates need to be replaced, the whole sealing structure does not need to be replaced, and replacement difficulty and cost are greatly reduced. Further, the plurality of stainless steel plates 63 are each screwed to the connection plate 62, thereby facilitating installation and replacement of the stainless steel plates 63. Taking a 40t scrap hopper 1 as an example, the stainless steel preferably has the following dimensions: the length is 150 mm-280 mm, the width is 400 mm-600 mm, and the overlapping length of the adjacent stainless steel plates 63 is 40 mm-60 mm.
For the specific form of the driving mechanism, it preferably adopts an electro-hydraulic push rod, the rotating shaft 61 is provided with a rotating arm, and the telescopic end of the electro-hydraulic push rod is connected with the tail end of the rotating arm. Therefore, the rotation angle of the rotating shaft 61 can be controlled by setting the telescopic stroke of the electro-hydraulic push rod, and the turnover angle of the stainless steel plate 63 is further controlled to be in an opening state or a closing state. Specifically, the bottom end of the electro-hydraulic push rod is rotatably hinged to the fixed base along a vertical surface, and the telescopic end of the electro-hydraulic push rod is in threaded connection with the rotating arm.
Preferably, the converter scrap continuous preheating system further comprises a heat exchanger disposed between the fume suction pipe and the heating device. This heat exchanger is used for carrying out heat exchange and heat recovery with exhaust flue gas, can reduce exhaust gas temperature on the one hand, reduces the exhaust gas temperature to below 180 degrees, protects subsequent dust collector, and on the other hand can improve heating device's heat utilization efficiency. More preferably, the other end of the heat exchanger is arranged in a combustion fan air pipeline of the heating device, so that air is preheated, the combustion efficiency is improved, and the heating effect of the scrap steel is improved.
From the above, the continuous preheating system for converter scrap provided by the invention has the following advantages:
1. the preheating system directly uses the scrap steel hopper as a heating container to heat the scrap steel, and compared with the heating mode of the traditional continuous conveyor, the preheating system reduces the processes of discharging, loading and discharging the scrap steel once, reduces the consumption, the labor consumption and the pollution, and improves the production efficiency.
2. This system of preheating sets up in reinforced striding to the track is along the transversal arrangement of reinforced striding, and the spare area in the reinforced interior of striding of abundant reasonable utilization from this need not additionally to add the space, reduction in production cost from this.
3. The flat car is adopted to transversely convey the waste steel hopper, on one hand, the flat car has a simple mechanical structure and is easy to operate, the energy medium and spare parts are less consumed, the transportation mode is mature and reliable, the conveying speed is high, the flat car speed can be accurately controlled, the initial position can be accurately controlled, the heating rhythm of the heating position burner is further accurately matched, the burner flame is prevented from directly heating the waste steel hopper, and the service life of the waste steel hopper is prolonged; on the other hand, horizontal transport can reduce the reinforced occupation of striding interior longitudinal space and taking up, increases the number of the heating position that sets up on the track, improves production efficiency.
4. The sealing belt and the waste steel hopper are movably sealed, and the conical smoke suction port of the smoke suction pipeline and the smoke discharge port of the waste steel hopper are in butt joint sealing, so that sealed smoke discharge can be realized during heating, smoke dust is prevented from overflowing, and the waste steel hopper is not influenced to move along with a flat car.
In conclusion, the continuous preheating system for the converter scrap steel has the advantages of high production efficiency, low pollution and low production cost.
The continuous preheating system for the converter scrap provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A continuous preheating system for converter scrap is characterized by comprising: scrap hopper, rail, flatcar, hood, heating device and sealing strip; wherein the content of the first and second substances,
the bottom of the scrap steel hopper is provided with a plurality of smoke exhaust branch pipes, and the tail ends of the smoke exhaust branch pipes form smoke outlets arranged along the horizontal direction;
the track is arranged on the charging span and is arranged along the transverse direction of the charging span; a hoisting position and a heating position are formed on the track;
the flat car is arranged on the track and can move between the hoisting position and the heating position, and the traveling direction of the flat car is vertical to the direction of a car body; the top of the flat car is used for supporting a scrap steel hopper;
the smoke hood is arranged at the heating position, and an inlet and an outlet for the flat car and the waste steel hopper to enter and exit are formed in one of two sides of the smoke hood along the track direction, which is close to the hoisting position; the smoke hood is provided with a plurality of smoke absorption pipelines, smoke absorption ports of the smoke absorption pipelines are conical ports with the inner diameters gradually reduced from outside to inside, the smoke absorption ports correspond to smoke exhaust ports of the waste steel hoppers at the tops of the flat cars at the heating positions, and the outer diameters of the smoke exhaust ports are between the maximum inner diameter and the minimum inner diameter of the smoke absorption ports;
the heating device is provided with a plurality of burners arranged along the length direction of the waste steel hopper, and the burners are arranged at the top of the smoke hood;
the upper end of the sealing band is hinged on the top end of the inlet and the outlet, and the sealing band has two working states: in the open state, the vertical distance from the lower end of the hopper to the ground is greater than the vertical distance from the top end of the scrap hopper positioned at the top of the flat car to the ground; in the closed state, the vertical distance from the lower end of the scrap hopper to the ground is smaller than the vertical distance from the top end of the scrap hopper positioned at the top of the flat car to the ground.
2. The continuous preheating system for converter scrap according to claim 1, further comprising: the distance sensor is used for acquiring the position information of the flat car, and the flat car is provided with a stroke controller which is connected with the distance sensor and used for controlling the wheel rotating speed of the flat car according to the position information.
3. The continuous preheating system for converter scrap according to claim 2, wherein the distance sensor is a laser positioning instrument, and a stainless steel reflecting plate arranged in a vertical direction is arranged on the flatcar; and a laser emitting head of the laser positioning instrument and the stainless steel reflecting plate are oppositely arranged along the direction parallel to the track.
4. The continuous preheating system for converter scrap according to claim 1, further comprising a travel switch, wherein a collision block matched with the travel switch is arranged at the bottom of the flat car body.
5. The continuous preheating system for converter scrap according to claim 1, wherein the exhaust branch pipe has a bent pipe structure, one end of the exhaust branch pipe is communicated with the inside of the scrap hopper, and the other end of the exhaust branch pipe forms the exhaust port.
6. The continuous preheating system for converter scrap according to claim 1, further comprising a heat exchanger disposed between the fume duct and the heating device.
7. The continuous preheating system for converter scrap according to claim 1, wherein a plurality of hoisting positions and heating positions are formed on the rail, and one or two heating positions are arranged between adjacent hoisting positions.
8. The continuous preheating system for converter scrap according to any one of claims 1 to 7, wherein the sealing strip comprises: the device comprises a rotating shaft, a connecting plate, a driving mechanism and a plurality of stainless steel plates; the rotating shaft is hinged to the top end of the inlet and the outlet, the connecting plate is welded to the rotating shaft, the stainless steel plates are fixed to the connecting plate, and the adjacent stainless steel plates are arranged in an overlapping mode; the driving mechanism is connected with the rotating shaft and used for driving the rotating shaft to rotate by a preset angle.
9. The continuous preheating system for converter scrap according to claim 8, wherein the stainless steel plates are all screwed to the connection plate.
10. The continuous preheating system for converter scrap according to claim 8, wherein the driving mechanism is an electro-hydraulic push rod, the rotating shaft is provided with a rotating arm, and a telescopic end of the electro-hydraulic push rod is connected with a tail end of the rotating arm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010295382.0A CN113528744A (en) | 2020-04-15 | 2020-04-15 | Continuous preheating system for converter scrap steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010295382.0A CN113528744A (en) | 2020-04-15 | 2020-04-15 | Continuous preheating system for converter scrap steel |
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| CN113528744A true CN113528744A (en) | 2021-10-22 |
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| CN202010295382.0A Pending CN113528744A (en) | 2020-04-15 | 2020-04-15 | Continuous preheating system for converter scrap steel |
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| CN114507764A (en) * | 2022-02-22 | 2022-05-17 | 江苏蓝创环保科技有限公司 | Device for heating scrap steel |
| CN114705042A (en) * | 2022-04-01 | 2022-07-05 | 南京贤云机电科技有限公司 | Automatic feeding and discharging method for baking scrap steel into furnace |
| CN114836591A (en) * | 2022-05-05 | 2022-08-02 | 湖南华菱涟源钢铁有限公司 | Method for top-blowing bottom-side-sucking composite baking of scrap steel in scrap steel tank |
| CN115572791A (en) * | 2022-10-19 | 2023-01-06 | 安徽闽建环保设备有限公司 | Intelligent bucket type scrap steel heating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114836591A (en) * | 2022-05-05 | 2022-08-02 | 湖南华菱涟源钢铁有限公司 | Method for top-blowing bottom-side-sucking composite baking of scrap steel in scrap steel tank |
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| CN115572791A (en) * | 2022-10-19 | 2023-01-06 | 安徽闽建环保设备有限公司 | Intelligent bucket type scrap steel heating system |
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Application publication date: 20211022 |
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