Steel scrap pelletizing and heating system for metallurgy

Abstract

The application relates to the field of burners, and particularly discloses a scrap steel bar cutting and heating system for metallurgy, which comprises a burner, a feeder in communication with the burner, a gas pipe forming a gas passage for conveying gas in a first direction, a combustion pipe in communication with the end of the gas pipe, an air pipe forming an air passage for conveying combustion-supporting gas, a filtering module for purifying the combustion-supporting gas, a connecting piece forming a chamber for accommodating the filtering module, wherein the communication chamber forms a necked portion in communication with the gas pipe and an expanded portion in communication with the combustion pipe along the first direction; the necked portion forms a first through hole in communication with the chamber, and the expanded portion forms a second through hole in communication with the chamber; the caliber of the necked portion is smaller than that of the expanded portion; the first through hole is at least 50 cm away from the second through hole along the first direction; and the scrap steel bar cutting and heating system for metallurgy can improve the combustion effect by precisely mixing the gas and the combustion-supporting gas, so that the energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of burners, in particular to a scrap steel bar cutting and heating system for metallurgy. BACKGROUND

[0002] In the scrap steel bar cutting and heating treatment process of the metallurgical industry, the burner is the core equipment for realizing the temperature rise of scrap steel bar cutting and meeting the smelting requirements. The combustion efficiency and fuel utilization rate directly determine the production energy consumption and processing cost.

[0003] At present, the burners of the traditional scrap steel bar cutting and heating system for metallurgy generally adopt a structure design of direct mixing of fuel gas and combustion-supporting gas (air). The combustion-supporting gas is directly taken from the external environment without effective purification treatment. The impurities such as dust and particles contained in the external air enter the combustion channel along with the combustion-supporting gas. On the one hand, the impurities will adhere to the inner wall of the gas flow path, causing the channel to be narrow or even blocked, affecting the stability of the mixing ratio of the fuel gas and the combustion-supporting gas. On the other hand, the impurities will interfere with the complete combustion of the fuel gas, resulting in insufficient rigidity of the combustion flame and uneven temperature distribution, which not only reduces the heating efficiency of the scrap steel bar cutting, but also causes the invalid consumption of the fuel gas, greatly increasing the production energy consumption.

[0004] Therefore, it is necessary to design a scrap steel bar cutting and heating system for metallurgy which can filter the impurities in the combustion-supporting gas to reduce the influence of the impurities on combustion, thereby improving the utilization rate of fuel gas and achieving energy-saving effect. SUMMARY

[0005] In order to improve the above problems, the present application provides a scrap steel bar cutting and heating system for metallurgy.

[0006] The scrap steel bar cutting and heating system for metallurgy provided by the present application comprises:

[0007] a burner for giving scrap steel bar cutting and heating treatment;

[0008] a feeding machine in communication with the burner;

[0009] The burner comprises:

[0010] a fuel gas pipe forming a fuel gas channel for conveying fuel gas in a first direction;

[0011] a combustion pipe in communication with an end of the fuel gas pipe;

[0012] an air pipe forming an air channel for conveying combustion-supporting gas;

[0013] a filter module for purifying the combustion-supporting gas;

[0014] a connecting piece forming a cavity for accommodating the filter module;

[0015] The gas pipe part is arranged in the air channel, and a cavity for the flow of the combustion-supporting gas is formed between the outer wall of the gas pipe and the inner wall of the air channel; the connecting piece is fixedly arranged on the gas pipe to communicate the cavity and the gas channel; the connecting piece forms a communication cavity communicating the gas pipe and the combustion pipe; the communication cavity forms a necked portion communicating with the gas pipe and an expanded portion communicating with the combustion pipe in the first direction; the necked portion forms a first through hole communicating with the cavity, and the expanded portion forms a second through hole communicating with the cavity; the caliber of the necked portion is smaller than that of the expanded portion; the first through hole is at least 50 cm away from the second through hole in the first direction.

[0016] By the coaxial design of the gas pipe part built-in air channel, the mixing path of the gas and the combustion-supporting gas is shortened, the mixing uniformity is improved, the combustion is fully guaranteed, and the heating efficiency and temperature stability of the scrap steel cutting particles are improved; the filter module purifies the combustion-supporting gas, reduces the impurities of the combustion-supporting gas, and makes the combustion-supporting gas have higher combustion-supporting efficiency; the necked portion, the expanded portion and the double through holes structure with a spacing of ≥50 cm of the connecting piece accurately control the mixing ratio and mixing time sequence of the gas and the combustion-supporting gas, avoid local insufficient combustion or deflagration risk, and improve the safety and controllability of the combustion process.

[0017] Optionally, the second through holes are annularly arrayed along the circumferential direction of the connecting piece;

[0018] The second through holes in the annular array in the expanded portion are distributed in a spiral shape around the first direction in sequence;

[0019] Optionally, the projection formed by the adjacent two second through holes in the circumferential direction on the same plane is 2-5 cm apart.

[0020] Optionally, a spray head is arranged on the second through hole;

[0021] The spray head forms a flow guide path for guiding the mixing of the combustion-supporting gas and the gas;

[0022] Optionally, the flow guide path and the first direction form an included angle on the same surface;

[0023] The included angles formed by the adjacent two spray heads in the clockwise and / or counterclockwise circumferential direction are all different by 20-30°.

[0024] Optionally, the filter module comprises:

[0025] A filter box forming a filter cavity communicating the air channel and the cavity;

[0026] A filter screen movably arranged on the inner wall of the filter cavity;

[0027] A cleaning assembly for cleaning the surface of the filter screen;

[0028] The opposite inner walls of the filter cavity form an air inlet and an air outlet; the filter screen is arranged in at least two and is spaced apart along the first direction; and the cleaning assembly is arranged between the two filter screens.

[0029] Optionally, the surface of the filter screen forms a concave part and a convex part.

[0030] The concave part and the convex part are connected in continuous alternation.

[0031] Optionally, a rotating ring for loading the filter screen is arranged on the inner wall of the filter cavity.

[0032] The side wall of the rotating ring forms a gear.

[0033] The inner wall of the filter cavity is slidably arranged with a ratchet gear engaged with the gear.

[0034] The sliding ratchet gear drives the gear to rotate in one direction.

[0035] Optionally, the inner wall of the filter cavity forms a sliding groove for the guide ratchet gear to slide along the circumferential direction of the rotating ring.

[0036] An elastic member is arranged between the end of the sliding groove and the ratchet gear.

[0037] A magnetic block is arranged on the ratchet gear.

[0038] An electromagnet is arranged on the outer wall of the filter box.

[0039] The electromagnet is arranged corresponding to the end of the sliding groove away from the ratchet gear.

[0040] Optionally, the cleaning assembly comprises:

[0041] A cleaning box is arranged between the two filter screens.

[0042] An electrostatic brush is arranged on the cleaning box and in contact with the surface of the filter screen.

[0043] A connecting pipe connects the inner wall of the filter cavity and the cleaning box.

[0044] The connecting pipe penetrates the air pipe to connect the outside; and the surface of the cleaning box is provided with an opening.

[0045] Optionally, it further comprises:

[0046] A flow regulating valve is arranged on the gas pipe and the air pipe respectively to control the flow of the gas and the combustion-supporting agent.

[0047] A temperature sensor is used to detect the temperature of the combustion pipe and output a first detection signal.

[0048] A flow sensor is used to detect the flow of the gas pipe and output a second detection signal.

[0049] A driving member is used to drive the flow regulating valve to rotate.

[0050] The temperature sensor and the flow sensor are in signal connection with the signal processor, and the signal processor receives and converts the first detection signal and / or the second detection signal into corresponding input instructions according to the first detection signal and the second detection signal or based on the current working mode.

[0051] Optionally, the input instructions include: a preset target temperature, data viewing, data storage, selection of a gas output flow, locking or shielding the first detection signal / second detection signal.

[0052] In summary, the present application includes at least one of the following beneficial technical effects:

[0053] 1. The structure of the coaxial air passage in the gas pipe, in combination with the necking portion, the flaring portion and the double through holes with a spacing of ≥50 cm, realizes the staged mixing of the gas and the combustion-supporting gas; the spiral array distribution of the second through holes and the differential setting of the guide angle of the nozzle, make the combustion-supporting gas be sprayed in a spiral shape, further improve the mixing uniformity, and finally form an elliptical long flame with good rigidity, improve the combustion efficiency, and at the same time ensure the ignition speed and avoid flameout;

[0054] 2. The filtering module increases the air contact area through the filtering screen with the concave-convex alternating structure, improves the impurity filtering effect, and optimizes the combustion-supporting performance; the cooperation of the rotating ring and the ratchet realizes the intermittent rotation of the filtering screen, and the static brush can synchronously clean the impurities on the surface of the filter screen; the impurities are discharged through the connecting pipe by using the pressure difference between the inside and outside of the filtering cavity, realizing the self-cleaning of the filtering module and reducing the equipment maintenance frequency and cost;

[0055] 3. The hopper of the feeding machine is driven to overturn by the hydraulic cylinder, and the transfer and feeding of the hopper can be completed by a forklift, realizing the mechanization and automation of the feeding of the scrap steel bar; after feeding, the system automatically starts the heating program, and automatically discharges after reaching the preset condition, which is suitable for the metallurgical large-scale production demand and improves the overall production efficiency;

[0056] 4. The gas pipe and the air pipe are both configured with flow regulating valves, which can be adjusted in real time according to the combustion pipe temperature and the gas flow in combination with the closed-loop control of the temperature sensor, the flow sensor and the signal processor; when abnormal conditions such as gas pressure loss, leakage and flameout are detected, the driving part can automatically close the flow regulating valve to avoid safety risks and realize the intelligent and safe operation of the system. BRIEF DESCRIPTION OF DRAWINGS

[0057] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application;

[0058] Figure 2 is a schematic diagram of the partial overall structure of a burner of an embodiment of the present application;

[0059] Figure 3is a partial half-section overall structure schematic diagram of a burner of an embodiment of the present application;

[0060] Figure 4 is a structure schematic diagram of a nozzle and a flow guide path of an embodiment of the present application;

[0061] Figure 5 is a half-section overall structure schematic diagram of a connecting piece of an embodiment of the present application;

[0062] Figure 6 is a partial enlarged view of Figure 5 ;

[0063] Figure 7 is an overall structure schematic diagram of a filter screen of an embodiment of the present application;

[0064] Figure 8 is a structure schematic diagram of a gear and a ratchet of an embodiment of the present application.

[0065] Reference signs:

[0066] 100, a scrap steel bar granulating and heating system for metallurgy; 101, a burner; 102, a feeder; 103, a support; 104, a hopper; 105, a hydraulic cylinder; 106, a fan;

[0067] 10, a gas pipe;

[0068] 20, a combustion pipe; 21, a cavity;

[0069] 30, an air pipe;

[0070] 40, a filter module; 41, a filter box; 410, a filter cavity; 411, an air inlet; 412, an air outlet; 42, a filter screen; 421, a concave part; 422, a convex part; 43, a rotating ring; 44, a gear; 45, a ratchet; 46, an elastic piece; 47, an electromagnet; 48, a magnetic block;

[0071] 60, a cleaning assembly; 61, a cleaning box; 610, an opening; 62, an electrostatic brush; 63, a connecting pipe;

[0072] 50, a connecting piece; 51, a cavity; 52, a necked part; 521, a first through hole; 53, an expanded part; 531, a second through hole; 532, a nozzle;

[0073] 70, a flow regulating valve; 71, a driving piece;

[0074] L, a first direction;

[0075] I, a flow guide path. DETAILED DESCRIPTION

[0076] Embodiments of the present disclosure will be described below in greater detail with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thoroughly and completely understood. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and should not be used to limit the scope of protection of the present disclosure.

[0077] In addition, it should be further noted that only parts related to the present application are shown in the drawings for ease of description. The embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0078] It should be noted that the terms "first", "second" and the like mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not intended to limit the order or interdependence of the functions performed by these devices, modules or units.

[0079] It should be noted that the adjectives "one", "multiple" mentioned in the present disclosure are illustrative and not restrictive, and those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0080] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0081] The embodiment of the present application discloses a steel bar cutting particle heating system for metallurgy 100, comprising: a burner 101, a feeder 102; specifically, the burner 101 is supported by a support 103, and the feeder 102 connected with the burner 101 is arranged on the support 103; wherein the feeder 102 has a hopper 104 communicated with the burner 101; the hopper 104 is driven to overturn by a hydraulic cylinder 105 to make the steel bar cutting particles in the hopper 104 pour into the burner 101 for metallurgy; specifically, the steel bar cutting particles are loaded in the hopper 104 in advance, then the steel bar cutting particle containing hopper 104 is transferred to the feeding tilting frame by using a forklift, then under the action of the hydraulic cylinder 105, the hopper 104 overturns to add the steel bar cutting particles into the burner 101, after feeding, the system automatically starts a large fire to heat the steel bar cutting particles, when reaching the required temperature or discharging time, the discharging valve of the heating furnace is opened, and the steel bar cutting particles are added into the molten steel through the chute; the burner 101 and the feeder 102 are both basic equipment commonly used in metallurgy on the market at present, and the present application does not make technical improvements on the assembly of the burner 101 and the feeder 102, therefore, detailed description is not made in the present application.

[0082] In the application, the burner 101 comprises a gas pipe 10, a combustion pipe 20, an air pipe 30, a filter module 40 and a connecting piece 50. Specifically, the gas pipe 10 has a gas passage 11 for conveying gas in a first direction L, and the gas conveyed in the gas passage 11 is coal gas. The combustion pipe 20 is in communication with the end of the gas pipe 10, and the end of the gas pipe 10 is provided with an ignition device to realize automatic ignition. The combustion pipe 20 is integrally cast from special steel and is subjected to multiple heat treatments, and the furnace body wall thickness is ≥110 mm, the effective temperature resistance is ≥1100℃, and the inner wall is free of any sprayed or built-in refractory material, so as to realize that the combustion pipe 20 is not easy to deform and the service life is increased during long-term use.

[0083] Specifically, the air pipe 30 forms an air passage for conveying combustion-supporting gas, the gas pipe 10 is partially arranged in the air passage, and the outer wall of the gas pipe 10 and the inner wall of the air passage have a cavity 21 for the combustion-supporting gas to flow. A fan 106 is arranged at the end of the air pipe 30 away from the gas pipe 10 to input external air into the air passage. The connecting piece 50 forms a chamber 51 for communicating the gas pipe 10 and the combustion pipe 20, and is fixedly arranged in the gas pipe 10 to communicate the mixing cavity and the gas passage. The communicating cavity forms a necked portion 52 in communication with the gas pipe 10 and an expanded portion 53 in communication with the combustion pipe 20 along the first direction L. The necked portion 52 forms a first through hole 521 in communication with the chamber 51, and the expanded portion 53 forms a second through hole 531 in communication with the chamber 51. The caliber of the necked portion 52 is smaller than that of the expanded portion. The distance between the first through hole 521 and the second through hole 531 along the first direction L is greater than 50 cm. Through the above scheme, when the gas flows to the necked portion 52 of the connecting piece 50, the flow cross section is reduced and the flow speed is increased. At this time, the air pressure of the necked portion 52 is reduced, and the air can be sucked into the necked portion 52 to mix with the gas to form mixed gas. When the mixed gas flows to the expanded portion, ignition starts to burn. At this time, the gas in the second through hole 531 continues to mix with the mixed gas being burned. In this way, an elliptical long flame with good rigidity can be formed under the expanded portion 53.

[0084] In the application, the second through hole 531 is annularly arranged along the circumferential direction of the connecting piece 50. The annular arrangement is spirally distributed around the first direction L on the second through hole 531 of the inner wall of the expanded portion. The projection distance of the adjacent two second through holes 531 in the circumferential direction in the same plane is 2-5 cm. In the embodiment, the distance between the adjacent two second through holes 531 along the first direction L is 5 cm.

[0085] Specifically, the second through hole 531 is provided with a spray head 532, and the spray head 532 forms a flow guide path I for guiding the mixture of combustion-supporting gas and fuel gas; wherein the flow guide path I and the first direction L form an alternate included angle on the same surface; the alternate included angle formed by adjacent two spray heads 532 in the clockwise and / or counterclockwise circumferential direction is all different by 20°-30°; it can be understood that the combustion-supporting gas is spirally sprayed under the action of the flow guide path I, and the mixed gas at the flared portion is further mixed, so as to achieve the purpose of fully mixing air to ignite fuel gas, and improve the combustion efficiency;

[0086] Through the above scheme, since the first through hole 521 is at least 50 cm away from the second through hole 531 along the first direction L, it can be understood that the necked portion 52 extends at least 50 cm along the first direction L; therefore, there is enough distance to make the fuel gas stable during transmission, and after mixing with the combustion-supporting gas, the ignition speed is improved, and flameout is avoided.

[0087] In another more specific embodiment, the filter module 40 is arranged in the chamber 51 for purifying the combustion-supporting gas; wherein the filter module 40 comprises: a filter box 41, a filter screen 42, and a cleaning assembly 60; specifically, the filter box 41 forms a filter cavity 410 communicating with the air passage and the chamber 51, the opposite inner walls of the filter cavity 410 form an air inlet 411 and an air outlet 412, and the filter screen 42 is arranged between the air inlet 411 and the air outlet 412; in this way, the air in the air pipe 30 can enter the filter cavity 410 through the air inlet 411 and contact the filter screen 42, and then enter the chamber 51 through the air outlet 412; the air filtered by the filter screen 42 reduces excess impurities, effectively improving the combustion-supporting effect of the combustion-supporting gas;

[0088] Specifically, the filter screen 42 forms a concave portion 421 and a convex portion 422 on the surface, and the concave portion 421 and the convex portion 422 are continuously and alternately connected; such arrangement can increase the contact area of air and the filter screen 42, which is beneficial to improve the filtering effect in such a small flow environment as the chamber 51;

[0089] Specifically, the inner wall of the filtering cavity 410 is rotationally provided with a rotating ring 43 for loading the filter screen 42, and the fixing mode of the rotating ring 43 and the filter screen 42 includes but is not limited to clamping, magnetic connection, screw and threaded connection; the side wall of the rotating ring 43 forms a gear 44, and the inner wall of the filtering cavity 410 is slidingly provided with a ratchet 45 engaged with the gear 44; wherein the sliding ratchet 45 drives the gear 44 to rotate in one direction; in this way, the filter screen 42 can be rotated to improve the filtering effect; the inner wall of the filtering cavity 410 forms a sliding groove for guiding the sliding of the ratchet 45 along the circumferential direction of the rotating ring 43, and an elastic element 46 is arranged between the end of the sliding groove and the ratchet 45, which is a spring and can give the ratchet 45 an elastic force to automatically reset to the state before moving; a magnetic block 48 is arranged on the ratchet 45, and an electromagnet 47 is arranged on the outer wall of the filter box 41; the electromagnet 47 is arranged corresponding to the end of the sliding groove away from the ratchet 45; the electromagnet 47 is connected with an external power supply and indirectly controls the power-on or power-off of the electromagnet 47 through a controller; when the electromagnet 47 is powered on, it can drive the ratchet 45 to move, and when the electromagnet 47 is powered off, the ratchet 45 resets under the elastic action; through the engagement of the ratchet 45 and the gear 44, the rotating ring 43 can be driven to rotate intermittently in one direction.

[0090] In this embodiment, two filter screens 42 are arranged and spaced apart along the first direction L; specifically, the cleaning assembly 60 is arranged between the two filter screens 42 to clean the dust on the filter screen 42 and ensure the filtering effect of the filter screen 42; wherein the cleaning box 61, the electrostatic brush 62 and the connecting pipe 63 are arranged; the cleaning box 61 is arranged between the two filter screens 42, and the cleaning box 61 is provided with a connecting pipe 63 fixed to the inner wall of the filtering cavity 410; the cleaning box 61 forms a box cavity inside, and the cleaning box 61 is provided with an opening 610 communicating with the box cavity; the electrostatic brush 62 is arranged on the cleaning box 61 and contacts the surface of the filter screen 42; in combination with the intermittent rotation of the rotating ring 43, the electrostatic brush 62 can brush the surface of the filter screen 42 to attract the impurities on the filter screen 42 to the electrostatic brush 62; since the filter box 41 is close to the heat source, the internal air has higher heat and pressure than the outside; in this way, the connecting pipe 63 penetrates the air pipe 30 to connect the outside, so that the impurities on the electrostatic brush 62 can be discharged from the connecting pipe 63 to the outside; thus, the self-cleaning of the device is realized.

[0091] In this application, the scrap steel wire particle cutting and heating system 100 further comprises: a flow regulating valve

[0092] 70, temperature sensor, flow sensor, driving member 71; wherein the flow regulating valve

[0093] 70 respectively set on the gas pipe 10 and the air pipe 30 to control the flow of gas and combustion-supporting agent; a temperature sensor is arranged on the combustion pipe 20 to detect the temperature of the combustion pipe 20 and output a first detection signal, and a flow sensor is arranged in the gas pipe 10 to detect the flow of the gas pipe 10 and output a second detection signal; the temperature sensor and the flow sensor are signal-connected with a signal processor, the signal processor receives and, according to the first detection signal and the second detection signal, selects a working mode or converts the first detection signal and / or the second detection signal into corresponding input instructions based on the current working mode; the input instructions include: a preset target temperature, data viewing, data storage, selection of gas output flow, locking or shielding of the first detection signal / second detection signal;

[0094] The above signal processor includes a dedicated DSP chip or a single-chip microcomputer control chip as a core, a data storage and a peripheral signal processing circuit, and the input instructions and other data represented by the first detection signal in each working mode are stored in the data storage, the first detection signal is transmitted to the single-chip microcomputer control chip after being processed by the peripheral signal processing circuit, such as AD conversion and filtering and denoising, and then the input instructions corresponding to the first detection signal are confirmed according to the current working mode, for example, after the feeding is completed, the current working mode is large fire roasting, and the working temperature in the combustion chamber contained in the first detection signal is used to represent the input instruction of the preset combustion temperature, which is used to adjust the combustion temperature.

[0095] Specifically, the driving member 71 is an electric valve for automatically closing / opening the flow regulating valve

[0096] 70; the driving member 71 responds to the output instructions transmitted by the signal processor; for example, the second detection signal detects the gas delivery in real time after the gas is delivered, if abnormal gas delivery occurs, such as pressure loss, gas leakage, flameout and other unexpected situations, the signal processor gives the driving member 71 an output instruction to close the gas pipe 10.

[0097] More specifically, the present application also includes a gas pipeline drainage system: because gas often carries water vapor during recovery, the water condenses into water and stays in the gas pipeline, hindering gas delivery; a drainage system is arranged on the roasting equipment gas pipeline to drain the water in time;

[0098] Waste gas pipeline discharge system: the exhaust hood distributed at the upper end is discharged to the secondary dust removal flue through the pipeline discharge system;

[0099] Gas leakage detection and alarm system: when the carbon monoxide content in the air around the equipment reaches 15 ppm / m³, an alarm is given to prompt maintenance. In accordance with the provisions of the Industrial Enterprises Natural Gas Safety Regulations: the maximum carbon monoxide concentration in the working environment is 30 ppm / m³;

[0100] Electric, instrument, mechanical power control cabinet design: according to the electric, instrument and mechanical electricity, reasonable selection of power supply capacity, line classification short circuit and overload protection; Configuration of the required AC and DC power supply for instruments, to ensure the normal work of electric, instrument, machinery; Equipment control system is divided into local manual control and automatic control two modes, local control is completed in the field operation cabinet. Through the field instrument acquisition and feedback signal, the control of the baking state is implemented by the electric control cabinet, and the expected purpose of baking is achieved.

[0101] In the description of the present application, it should be noted that unless otherwise expressly specified and limited, the terms "mounting", "connection", "connection" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0102] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A metallurgical scrap steel bar granulation heating system, comprising: a burner for applying a heating treatment to the steel bar granulation; a feeder in communication with the burner; characterized in that the burner comprises: a gas tube forming a gas passage for conveying gas in a first direction; a combustion tube in communication with an end of the gas tube; an air tube forming an air passage for conveying combustion-supporting gas; a filter module for purifying the combustion-supporting gas; a connecting member forming a chamber for accommodating the filter module; wherein the gas tube is partially arranged in the air passage, and a cavity for the flow of combustion-supporting gas is formed between the outer wall of the gas tube and the inner wall of the air passage; the connecting member is fixedly arranged on the gas tube to communicate the cavity and the gas passage; the connecting member forms a communication cavity for communicating the gas tube and the combustion tube; the communication cavity forms a necked portion in communication with the gas tube and an expanded portion in communication with the combustion tube in the first direction; the necked portion forms a first through hole in communication with the chamber, and the expanded portion forms a second through hole in communication with the chamber; the caliber of the necked portion is smaller than that of the expanded portion; the first through hole is at least 50 cm away from the second through hole in the first direction; the filter module comprises: a filter box forming a filter cavity in communication with the air passage and the chamber; a filter screen movably arranged on the inner wall of the filter cavity; a cleaning assembly for cleaning the surface of the filter screen; wherein the opposite inner walls of the filter cavity form an air inlet and an air outlet; the filter screen is arranged at least two and is spaced apart in the first direction; the cleaning assembly is arranged between the two filter screens; a rotating ring is rotatably arranged on the inner wall of the filter cavity for loading the filter screen; the side wall of the rotating ring forms a gear; the inner wall of the filter cavity slidably arranges a ratchet in engagement with the gear; wherein the ratchet is slid to drive the gear to rotate in one direction; the inner wall of the filter cavity forms a sliding groove for guiding the ratchet to slide along the circumferential direction of the rotating ring; a resilient member is arranged between the end of the sliding groove and the ratchet; a magnetic block is arranged on the ratchet; an electromagnet is arranged on the outer wall of the filter box; wherein the electromagnet is arranged corresponding to the end of the sliding groove away from the ratchet.

2. The metallurgical scrap steel bar granulation heating system according to claim 1, characterized in that: the second through holes are annularly arranged along the circumferential direction of the connecting member; the second through holes in the expanded portion are sequentially distributed in a spiral shape along the first direction; wherein the projections formed by the adjacent two second through holes in the circumferential direction on the same plane are spaced apart by 2-5 cm.

3. The metallurgical scrap steel bar granulation heating system according to claim 2, characterized in that: a nozzle is arranged on the second through hole; the nozzle forms a flow guide path for guiding the mixture of combustion-supporting gas and gas; wherein the flow guide path and the first direction form an included angle on the same surface; the included angles formed by the adjacent two nozzles in the clockwise and / or counterclockwise circumferential direction are different by 20-30°.

4. The steel scrap cutting and heating system for metallurgy according to claim 3, characterized in that: the filter screen surface forms concave and convex parts; the concave and convex parts are connected in continuous alternation.

5. The steel scrap cutting and heating system for metallurgy according to claim 4, characterized in that: the cleaning assembly comprises: a cleaning box arranged between the two filter screens; an electrostatic brush arranged on the cleaning box and in contact with the filter screen surface; a connecting pipe connecting the inner wall of the filter cavity and the cleaning box; wherein the connecting pipe penetrates through the air pipe to connect the outside; and the cleaning box surface is provided with an opening.

6. The steel scrap cutting and heating system for metallurgy according to claim 1, characterized in that: further comprising: a flow regulating valve arranged on the gas pipe and the air pipe respectively to control the flow of gas and combustion-supporting agent; a temperature sensor for detecting the temperature of the combustion pipe and outputting a first detection signal; a flow sensor for detecting the flow of the gas pipe and outputting a second detection signal; a driving member for driving the flow regulating valve to rotate; wherein the temperature sensor and the flow sensor are signal-connected with a signal processor, the signal processor receives and selects a working mode according to the first detection signal and the second detection signal, or converts the first detection signal and / or the second detection signal into corresponding input instructions based on the current working mode.

7. The steel scrap cutting and heating system for metallurgy according to claim 6, characterized in that: the input instructions include: preset target temperature, data viewing, data storage, selection of gas output flow, locking or shielding the first detection signal / second detection signal.

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