Scalable hanging pipe row type fuel gas injection device and control method thereof

Abstract

The invention belongs to the field of steel smelting, and particularly discloses a scalable hanging pipe row type fuel gas injection device and a control method thereof. The device comprises a gas pipe, a blowing cover and a push-pull device. The blowing cover comprises a plurality of partition plates parallel to one another, telescopic rods connected with the adjacent partition plates and foldable cover bodies connected with the adjacent partition plates. A blowing pipe row is hung in the cover body, the blowing pipe row comprises a plurality of blowing pipes which are connected through foldable connecting rods and are parallel to one another, the blowing pipes are communicated with a gas pipe, blowing holes are formed in the blowing pipes, and gas enters a material layer through the blowing holes. The injection cover sliding rails are arranged on the two sides of the sintering trolley correspondingly, the push-pull device drives the two ends of the injection cover to slide along the injection cover sliding rails correspondingly, space can be vacated for maintenance, and the fuel gas injection starting point position and the fuel gas injection covering length can be adjusted. According to the method, by controlling the fuel gas injection starting point position, the fuel gas injection coverage length and the fuel gas injection amount, the optimal production working condition can be guaranteed, and the production quality is improved.

Description

Technical Field

[0001] This invention relates to the field of iron and steel smelting technology, specifically to a scalable suspended pipe-type gas injection device and its control method. Background Technology

[0002] Sintering is a key step in the ironmaking process. Its principle is to mix various powdered iron-containing raw materials with appropriate amounts of fuel and flux, add appropriate amounts of water, mix and pelletize them, and then sinter them into blocks on sintering equipment to undergo a series of physicochemical changes, which are then sent to the blast furnace for the next step.

[0003] To reduce the coke ratio and smelting costs in blast furnace ironmaking, blast furnaces typically require sintered ore to have high strength and high reducibility. The sintering process generally requires sintered ore with high strength, high yield, low return rate, and low fuel consumption. High-strength and highly reducible sintered ore consumes less coke during blast furnace smelting, thus reducing carbon dioxide emissions. From a long-term perspective, carbon dioxide emission reduction requirements will become one of the bottlenecks restricting the development of the steel industry. According to relevant data, carbon dioxide emissions from sintering and blast furnace processes account for approximately 60% of total industrial emissions. Therefore, whether from the perspective of cost reduction for enterprises or environmental protection, reducing the proportion of solid fuel consumption in sintering and lowering the fuel ratio of blast furnace burdens have become urgent needs for ironmaking technology.

[0004] Against this backdrop, JFE Corporation of Japan developed the "Gas Fuel Injection Technology for Sintering Sheets." Its principle involves injecting gaseous fuel diluted to below the lower limit of combustible concentration onto the sintering trolley a short distance after ignition via an injection device, allowing it to burn and provide heat within the sintering sheet. This technology reduces solid carbon consumption and CO2 emissions in sinter production. Furthermore, because the combustion of the gaseous fuel widens the high-temperature zone of the sintering sheet during production, the sintering temperature of 1200–1400°C is maintained for an extended period, effectively enhancing the strength and porosity of the sinter (5–10 mm). This results in significant energy savings, emission reductions, and quality improvement.

[0005] However, due to existing gas injection technology, the gas injection device is fixed within a predetermined range on the sintering machine and is inconvenient to disassemble. Even when the sintering machine is not in operation, the gas injection device remains above it, making maintenance extremely difficult. Workers can only repair the trolley by pushing it out of the gas injection device's coverage area section by section, which is not only labor-intensive but also has a very low safety factor, making accidents highly likely. Furthermore, existing gas injection devices cannot adjust the gas injection starting point and coverage length in real time during sintering production, thus failing to achieve real-time optimization and preventing the sintering machine from adaptively maintaining optimal operating conditions. Therefore, this invention proposes a scalable suspended pipe-type gas injection device and its control method to solve the above problems. Summary of the Invention

[0006] The main objective of this invention is to provide a scalable suspended pipe-type gas injection device and its control method, which can change the gas injection starting point and the gas injection coverage length, thereby helping to maintain the optimal sintering conditions and facilitating the maintenance of the sintering machine.

[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0008] A scalable suspended pipe-type gas injection device includes a gas pipe, an injection pipe array, an injection hood, and a push-pull device. The injection hood includes several partitions arranged parallel to the length of the sintering trolley, telescopic rods with both ends perpendicularly connected to two adjacent partitions, and a foldable cover body with both ends connected to two adjacent partitions. The injection pipe array is suspended within the cover body by suspension members. The injection pipe array includes several parallel injection pipes and foldable connecting rods with both ends connected to adjacent injection pipes. The injection pipes communicate with the gas pipe located outside the injection hood, and each injection pipe has several injection holes. Injection hood slide rails are provided on both sides of the sintering trolley, and the injection hood slides on the injection hood slide rails. The push-pull device drives both ends of the injection hood to slide along the injection hood slide rails. The gas pipe is provided with a displacement compensation structure to accommodate the movement of the cover body.

[0009] In the technical solution of this invention, the blowing hood slides on the blowing hood slide rails on both sides of the sintering trolley and covers the top of the sintering trolley. The blowing hood includes multiple partitions arranged parallel to each other along the length of the sintering trolley, telescopic rods connecting adjacent partitions, and a foldable cover body connecting adjacent partitions. A push-pull device can push both ends of the blowing hood to slide along the blowing hood slide rails. Driven by the push-pull device, the distance between adjacent partitions decreases, and the cover body folds, thereby folding the entire blowing hood and changing its position and length. This exposes the previously covered sintering trolley platform, providing space for maintenance, and also allows adjustment of the gas injection starting point position and gas injection coverage length. Simultaneously, the mounting frame of the cover body, composed of partitions and telescopic rods, ensures the stability of the blowing hood during the folding process, preventing instability and overturning. After the obstruction above the sintering trolley platform is removed, maintenance personnel can directly enter the sintering trolley platform or directly lift the sintering trolley out, facilitating maintenance of the sintering trolley. Adjusting the starting point position and coverage length of gas injection helps maintain optimal production conditions and improve production quality.

[0010] The push-pull mechanism connects to both ends of the blow-off hood. When the push-pull mechanism drives the end partitions closer to adjacent partitions, the telescopic rods are gradually compressed, causing the hood and blow-off pipe array to fold. When the telescopic rods reach their shortest state, the hood and blow-off pipe array reach their maximum folded state and can no longer be folded. At this point, the driving force of the push-pull mechanism is fully transferred to the next partition, which in turn drives the subsequent telescopic rods to retract, causing the subsequent hood and blow-off pipe arrays to fold, until all telescopic rods are at their shortest state and all hoods and blow-off pipe arrays are at their maximum folded state, with the length of the blow-off hood folded to its minimum. When the push-pull mechanism drives the end partitions away from adjacent partitions, the telescopic rods are gradually extended, causing the hood and blow-off pipe arrays to unfold. When the telescopic rod reaches its longest position, the cover and the spray pipe array are fully extended. At this time, the driving force of the push-pull device will be fully transmitted to the next partition, which in turn drives the subsequent telescopic rods to extend, and the subsequent covers and spray pipe arrays to unfold, until all the telescopic rods are in their longest position, all the covers and spray pipe arrays are fully extended, and the length of the spray cover reaches its maximum.

[0011] Furthermore, to adapt to different working conditions, the other partitions located between the two end partitions in this solution can have openings (such as rectangular openings) to allow the blowing spaces between adjacent partitions to be connected to each other, transforming the partitioned blowing hood with multiple independent compartments into an integral blowing hood with a fully connected blowing space.

[0012] Preferably, the suspension component includes a suspension rod and a first limiting block. One end of the suspension rod is rotatably connected to the partition, and the other end of the suspension rod is rotatably connected to the blowpipe. A second limiting block is provided on the partition, and the first limiting block and the second limiting block can abut against each other to restrict the rotation of the suspension rod relative to the partition.

[0013] Specifically, the injection pipes extend along the width of the sintering trolley, and the injection pipes within the same enclosure are parallel to each other and parallel to the partitions. The injection pipes within the same enclosure are on the same horizontal plane and are evenly distributed along the length of the sintering trolley, thus ensuring uniform distribution of the injection pipes within the enclosure, thereby ensuring uniform gas distribution on the surface of the sintering trolley and improving sintering quality.

[0014] Each spray nozzle is divided into outer spray nozzles located on both sides and an inner spray nozzle located between the two outer spray nozzles. One end of the suspension rod is hinged to the upper part of the partition, and the other end of the suspension rod is hinged to the outer spray nozzle. The suspension rods are parallel to each other. The number of suspension rods is at least four, with two suspension rods respectively located at both ends of one of the outer spray nozzles, and the other two suspension rods respectively located at both ends of the other outer spray nozzle. In one embodiment, the number of suspension rods is six, with three suspension rods respectively located at both ends and the middle of one of the outer spray nozzles, and the other three suspension rods respectively located at both ends and the middle of the other outer spray nozzle.

[0015] Preferably, the connecting rod includes a first rod and a second rod that are rotatably connected to each other. The first rod is provided with a third limiting block, and the second rod is provided with a fourth limiting block. The third limiting block and the fourth limiting block can abut against each other to restrict the relative rotation of the first rod and the second rod.

[0016] Specifically, at least two connecting rods are provided between adjacent blowpipes. One connecting rod is connected to the same end of the two adjacent blowpipes at both ends, and the other connecting rod is connected to the other end of the two adjacent blowpipes at both ends. The connecting rods between adjacent blowpipes are parallel to each other. The first rod and the second rod are hinged. In one embodiment, three connecting rods are provided between two adjacent blowpipes, with the three connecting rods respectively located at both ends and the middle of the adjacent blowpipes.

[0017] When the pushing device drives the spray nozzle to fold, adjacent partitions move closer together. Driven by the partitions, the suspension rods rotate relative to the partitions until the first and second limit blocks abut. At this point, the relative rotation between the suspension rods and partitions ceases. The driving force of the push-pull device is directly transmitted to the spray nozzle array, causing the first and second rods to rotate relative to each other. Adjacent spray nozzles move closer together, and the spray nozzle array folds until the third and fourth limit blocks abut. At this point, the first and second rods cease relative rotation, and adjacent spray nozzles no longer move closer together. When there is no longer relative rotation between the partitions and suspension rods, or between the first and second rods, the spray nozzle is folded to its shortest length. When the spray nozzle array is not folded, the connecting rod is perpendicular to the spray nozzle, and the first and second rods are coaxially connected.

[0018] Preferably, the cover includes a top cover and side covers connected to both ends of the top cover. Both the top cover and the side covers are made of flexible sealing material. The device also includes a manifold and a connecting pipe. The connecting pipe is a flexible hose. The manifold is fixed to the side covers. The inlet of the manifold communicates with the gas pipe, and the manifold has several outlets corresponding one-to-one with the injection pipes, each outlet communicating with its corresponding injection pipe. The injection holes are located on the side of the injection pipe facing the sintering trolley.

[0019] The top and side covers, made of flexible sealing material, enable the hood to be flexible and foldable, allowing the position and length of the blow-off hood to be changed by a push-pull mechanism, while also preventing gas loss by passing through the hood. Optionally, both the top and side covers are made of fiberglass cloth or ceramic fiber cloth with silicone or polyimide coatings on both sides.

[0020] Specifically, the connecting pipe is configured as a flexible hose (such as a stainless steel flexible metal hose) to accommodate the folding of the shroud and the blowpipe array. Furthermore, to reduce the pulling force of the connecting pipe on the lateral cover and improve its service life, the connecting pipe is connected to the outlet of the distributor using a ball joint or a universal swivel joint. The blowpipe holes are evenly spaced along the length of the blowpipe and are opened vertically downwards or at a 10°~15° angle towards the direction of the sintering trolley's movement to ensure uniform gas flow into the material layer and improve the efficiency of gas flow into the material layer.

[0021] Specifically, the side covers are located on both sides of the sintering trolley sideboard, with the bottom of the side covers positioned below the top surface of the sintering trolley sideboard. Flexible sealing curtains are installed at the bottom of the two partitions at both ends of the blow-off hood. These flexible sealing curtains are made of ceramic fiber cloth or fiberglass cloth coated with silicone. The flexible sealing curtains hang naturally over the material surface of the sintering trolley to compensate for the gap between the bottom of the end partitions and the material surface. When the trolley moves forward, the material moves relative to the stationary blow-off hood, causing the ends of the flexible sealing curtains on the end partitions to bend backward, forming a dragging curtain. To ensure effective sealing and compensate for curtain wear, the flexible sealing curtain must be long enough so that after being dragged by the material surface, a section of the curtain still presses against the material surface; the length pressing against the material surface is preferably 50mm to 100mm.

[0022] Furthermore, the flexible sealing curtain is detachably connected to the bottom of the end partition to facilitate replacement of the flexible sealing curtain. In one embodiment, the flexible sealing curtain is connected to the bottom of the end partition using a pressure plate bolt. Specifically, a metal pressure plate is provided at the bottom of the end partition, and a high-temperature bolt is passed through the metal pressure plate, the flexible sealing curtain, and the end partition, and tightened with a nut to fix the flexible sealing curtain.

[0023] Preferably, the gas pipeline includes a main gas pipe and a plurality of gas branch pipes, each connected to the main gas pipe and corresponding to a manifold. The displacement compensation structure includes flexible hose sections and rigid pipe sections arranged alternately on the main gas pipe. Each gas branch pipe corresponds to a rigid pipe section, with one end of the branch pipe connected to the corresponding rigid pipe section and the other end connected to the corresponding manifold. The branch pipes and rigid pipe sections can move with their corresponding manifolds. A main gas pipe valve is provided on the main gas pipe.

[0024] When the blowdown hood folds, adjacent rigid pipe sections are connected by a flexible intermediate section, allowing them to move closer together. This enables the gas branch pipes connected to the rigid pipe sections to adapt to the movement caused by the hood folding. Furthermore, to reduce the pulling force of the gas branch pipes on the lateral covers when the blowdown hood moves along its guide rails, and to improve the service life of the lateral covers, the gas branch pipes are made of flexible metal hoses (such as stainless steel flexible metal hoses), and the gas branch pipes are connected to the inlet of the manifold using a ball joint or a universal swivel joint. To further improve the service life of the gas pipes, the device can also be equipped with a guide support for the main gas pipe. The guide support extends along the length of the sintering trolley, and the rigid pipe sections slide along the guide support when the blowdown hood folds or unfolds. The contact surface between the guide support and the main gas pipe uses a low-friction material, such as PTFE sheet or stainless steel-PTFE, to reduce frictional loss.

[0025] The main gas pipe delivers gas to each branch pipe via individual manifolds. The branch pipes then distribute the gas to each injection pipe, which injects it through injection holes onto the material layer, where it then enters the material layer. Main gas pipe valves (such as electromagnetic flow valves and electric regulating valves) control the gas injection rate. To further regulate gas injection and ensure uniformity, branch pipe valves are installed on the branch pipes.

[0026] Preferably, pulleys are provided at both ends of the bottom of the partition, and the pulleys slide on the blown-out hood slide rails on both sides of the sintering trolley. The push-pull device includes a first push-pull device and a second push-pull device. The first push-pull device drives one end of the blown-out hood to slide along the blown-out hood slide rail, and the second push-pull device drives the other end of the blown-out hood to slide along the blown-out hood slide rail.

[0027] Preferably, the first push-pull device is located at the end of the blow-off hood near the sintering machine head to adjust the starting position of the gas injection. There are two first push-pull devices, each located on one side of the sintering trolley. Each first push-pull device includes a first reaction frame, a first push-pull rod, and a first support platform. The first reaction frame is located on the first support platform, the fixed end of the first push-pull rod is fixed to the first reaction frame, and the movable end of the first push-pull rod is connected to the partition plate at the end of the blow-off hood near the sintering machine head.

[0028] The first push-pull device is located at the end of the blow-jet hood near the head of the sintering trolley. Two first push-pull devices extend and retract synchronously, driving this end of the blow-jet hood to slide along the blow-jet hood slide rail, thereby adjusting the distance between this end of the blow-jet hood and the head of the sintering machine, i.e., the starting position of the gas injection. The first push-pull devices are symmetrically arranged on both sides of one end of the blow-jet hood, so that the first push-pull devices do not obstruct the space above the sintering trolley, facilitating the hoisting of the trolley during maintenance.

[0029] Specifically, the first reaction frame provides sufficient reaction force support for the first push-pull rod (such as a multi-stage telescopic hydraulic cylinder). The telescopic length of the first push-pull rod is the sliding distance of the blown hood near the sintering machine head. The movable ends of the two first push-pull rods are respectively connected to the middle of both ends of one of the end partitions to ensure balanced force distribution on the partition. The first reaction frame includes a first column and a first diagonal brace. The first column is vertically fixed to the surface of the first support platform. One end of the first diagonal brace is connected to the surface of the first support platform, and the other end is connected to the upper part of the first column. The first diagonal brace is located on the side of the first column opposite to the first push-pull rod, and the inclination angle of the first diagonal brace is 30°~60°, preferably 45°.

[0030] Preferably, the second push-pull device is located at the end of the blow-off hood furthest from the sintering machine head, for adjusting the gas injection coverage length. There are two second push-pull devices, each located on one side of the sintering trolley. Each second push-pull device includes a second reaction frame, a second push-pull rod, and a second support platform. The second reaction frame is mounted on the second support platform, the fixed end of the second push-pull rod is fixed to the second reaction frame, and the movable end of the second push-pull rod is connected to the partition plate at the end of the blow-off hood furthest from the sintering machine head.

[0031] The second push-pull device is located at the end of the blow-blown hood furthest from the sintering trolley head. The two second push-pull devices extend and retract synchronously, driving this end of the blow-blown hood to slide along the blow-blown hood slide rail, thereby adjusting the distance between the two ends of the blow-blown hood, i.e., the gas injection coverage length. The second push-pull devices are symmetrically arranged on both sides of one end of the blow-blown hood, so that the second push-pull devices do not obstruct the space above the sintering trolley, facilitating the hoisting of the trolley during maintenance.

[0032] Specifically, the second reaction frame provides sufficient reaction force support for the second push-pull rod (such as a multi-stage telescopic hydraulic cylinder). The telescopic length of the second push-pull rod is the sliding distance of the blown hood away from the sintering machine head. The movable ends of the two second push-pull rods are respectively connected to the middle of both ends of the other end partition to ensure balanced force on the partition. The second reaction frame includes a second column and a second diagonal brace. The second column is vertically fixed to the platform of the second support table. One end of the second diagonal brace is connected to the platform of the second support table, and the other end is connected to the upper part of the second column. The second diagonal brace is located on the side of the second column opposite to the second push-pull rod, and the inclination angle of the second diagonal brace is 30°~60°, preferably 45°.

[0033] The first and second push-pull devices are symmetrically arranged at both ends of the blown hood. When adjusting the position and length of the blown hood, the first push-pull device first drives the end of the blown hood near the sintering machine head to slide along the blown hood slide rail, adjusting the distance between the end of the blown hood near the sintering machine head and the sintering machine head, thereby determining the starting position of the gas injection. Then, the second push-pull device drives the end of the blown hood away from the machine head to slide along the blown hood slide rail, adjusting the distance between the two ends of the blown hood, thereby determining the gas injection coverage length, and finally determining the position and length of the blown hood.

[0034] Furthermore, to ensure stable pushing and pulling, the partition at the end, which connects the first and second pushing and pulling devices, is equipped with reinforcing ribs to improve its rigidity. To prevent the first and second pushing and pulling rods from sagging, support brackets are respectively provided below the first and second pushing and pulling rods. For example, when the pushing and pulling rod is a multi-section telescopic cylinder, the pushing and pulling rod includes a cylinder and multiple telescopic sections, and the support brackets support it below the cylinder.

[0035] Preferably, the telescopic rod comprises multiple tubular sections with decreasing diameters that are nested sequentially. The telescopic rod is located at least at both ends of the bottom of the partition.

[0036] The telescopic rods located at both ends of the bottom of the partition, along with the suspension rods and spray pipe array located at the top of the partition, form a connecting frame between adjacent partitions. This maintains the stability of the spray hood and transmits the driving force of the push-pull device. In one embodiment, the partition is rectangular, and there are two telescopic rods between adjacent partitions, each located at one end of the bottom of the partition to connect to the next adjacent partition. Alternatively, to further improve the stability of the spray hood, telescopic rods can also be installed at both ends of the top of the partition. In another embodiment, the partition is rectangular, and there are four telescopic rods between adjacent partitions, each located at one of the four corners of the partition to connect to the next adjacent partition.

[0037] The telescopic rod is a sleeve-type telescopic rod. When subjected to force, the telescopic rod will retract until all other tube sections have retracted into the inner part of the outermost tube section. After that, the length of the telescopic rod is fixed, and the force is transmitted to the next telescopic rod. The length of the outermost joint is the shortest length of the telescopic rod, and also the shortest length that each cover can be folded.

[0038] A control method for a scalable suspended pipe-type gas injection device, applied to a scalable suspended pipe-type gas injection device. The method includes:

[0039] Step S1: Monitor the ignition surface characteristic parameters under the current working conditions, including: surface brightness, crack width, particle density, and surface color.

[0040] Specifically, the device also includes an ignition surface visual recognition system for acquiring ignition surface feature parameters. The ignition surface recognition system includes a high-temperature camera for capturing images of the ignition surface and a processor for processing the images captured by the high-temperature camera. Based on the acquired ignition surface images, the processor can obtain the corresponding ignition surface feature parameters through appropriate image processing algorithms.

[0041] Step S2: Calculate the optimal gas injection start point position based on the ignition surface characteristic parameters:

[0042] ,

[0043] In the formula, The optimal distance from the gas injection start point to the sintering machine head is denoted in meters. The brightness of the material surface after ignition in the sintering machine is dimensionless. The width of the crack on the material surface after ignition in the sintering machine is expressed in meters (m). The particle density on the material surface after ignition in the sintering machine is dimensionless. The color of the material surface after ignition in the sintering machine is dimensionless. This is a dimensionless parameter for adjusting the starting point position of gas injection, with a value range of 1-10.

[0044] Step S3: Monitor the sintering multi-characteristic parameters under the current working conditions. The sintering multi-characteristic parameters include: material particle size, material moisture content, carbon content per ton of ore in the process, and process basicity value.

[0045] Specifically, the particle size of the material is obtained through a visual recognition system for the ignition surface, the moisture content of the material is obtained through a microwave moisture meter, the carbon content per ton of ore in the process is obtained according to design parameters or on-site testing, and the alkalinity value of the process is obtained through X-ray fluorescence spectroscopy, inductively coupled plasma atomic emission spectroscopy, transient gamma-ray neutron activation analysis, or laser-induced breakdown spectroscopy (LIBS).

[0046] Step S4: Calculate the optimal gas injection coverage length based on multiple sintering characteristic parameters:

[0047] ,

[0048] In the formula, The optimal gas injection coverage length is in meters (m). The particle size of the sintering mixture is expressed in meters (m). The carbon content per ton of ore in the current operating condition of the sintering machine is expressed in kg / t. The moisture content of the sintering mixture is dimensionless. The alkalinity of the current process produced by the sintering machine is dimensionless. The parameter for adjusting the coverage length of the gas injection is t / kg, with a range of 10-50.

[0049] Step S5: Based on the optimal gas injection starting point and gas injection coverage length, combined with the current sintering machine output, hourly carbon consumption of the process, and venting volume per ton of ore in the process, calculate the current optimal gas injection rate:

[0050] ,

[0051] In the formula, For the optimal gas injection rate, m 3 / h. The output of the sintering machine is expressed in tons per hour (t / h). The ventilation volume per ton of ore in the process is expressed in m³. 3 / t. The optimal gas injection coverage length is in meters (m). The optimal distance from the gas injection start point to the sintering machine head is denoted in meters. The carbon consumption per hour for the sintering machine process is expressed in t / h. The gas injection rate adjustment coefficient is t / h, with a value range of 0-2.

[0052] Specifically, the output of the sintering machine, the hourly carbon consumption of the process, and the ventilation volume per ton of ore in the process are obtained from design parameters or on-site testing.

[0053] Step S6: Adjust the starting position of the gas injection by the first push-pull device, adjust the gas injection coverage length of the injection hood by the second push-pull device, and adjust the gas injection volume by the gas main pipe valve.

[0054] It should be noted that all formulas in this invention were obtained by the inventors based on experimental and engineering applications, and all calculations were obtained by substituting the converted values ​​into the formulas according to the prescribed units (after converting the units, only the values ​​are substituted into the formulas for calculation, not the units; the units are only used to adjust the size of the values).

[0055] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0056] 1. The scalable suspended pipe-type gas injection device of the present invention consists of several parallel partitions and telescopic rods with their ends perpendicularly connected to adjacent partitions. A foldable cover is installed between the adjacent partitions to form a foldable injection cover. A push-pull device can drive the slide rails at both ends of the injection cover to slide along the injection cover, allowing the injection cover to change its position and length, thereby adjusting the gas injection starting point position and the gas injection coverage length, which helps to maintain optimal working conditions and improve sintering quality. Furthermore, after the injection cover is folded, the obstruction above the sintering trolley can be removed, freeing up space for maintenance and facilitating the maintenance of the sintering trolley.

[0057] 2. The scalable suspended pipe array gas injection device of the present invention, through the setting of suspension rods and connecting rods, enables the injection pipe array to be foldable, allowing the injection pipe array to adapt to the folding and stretching of the injection hood while ensuring uniform gas injection. Simultaneously, the suspension rods and injection pipe array can act as a connecting skeleton between adjacent partitions, cooperating with the telescopic rods to connect adjacent partitions, which helps ensure structural stability. Moreover, because the hood is made of flexible sealing material, compared with traditional injection hoods made of multiple metal plates, the weight of the injection hood is greatly reduced, facilitating the movement and maintenance of the injection hood.

[0058] 3. The control method of the scalable suspended pipe-type gas injection device of the present invention can adjust the injection hood to the optimal gas injection starting point and the optimal gas injection coverage length, and adjust the gas injection quantity to the optimal gas injection quantity, thereby maintaining the best production conditions and improving sintering quality. Attached Figure Description

[0059] Figure 1This is a schematic diagram showing the connection of the blow hood, gas pipe, and blow pipe array of the scalable suspended pipe array gas injection device of the present invention (top cover not shown).

[0060] Figure 2 This is a schematic diagram of the extended state of the nozzle cover of the scalable suspended pipe gas injection device of the present invention (side cover not shown).

[0061] Figure 3 This is a schematic diagram of the scalable suspended pipe gas injection device of the present invention in a compressed state (side cover not shown).

[0062] Figure 4 This is a schematic diagram showing the connection of the injection pipe array of the scalable suspended pipe array gas injection device of the present invention in an extended state.

[0063] Figure 5 This is a schematic diagram showing the connection of the injection pipe array of the scalable suspended pipe array gas injection device of the present invention in a compressed state.

[0064] Figure 6 This is a schematic flowchart illustrating the control method of the scalable suspended pipe gas injection device of the present invention.

[0065] Reference numerals: 1: Gas main pipe; 101: Rigid pipe section; 102: Flexible pipe section; 2: Gas branch pipe; 3: Pipe splitter; 4: Connecting pipe; 5: Purge pipe; 6: Connecting rod; 601: First rod; 602: Third limiting block; 603: Second rod; 604: Fourth limiting block; 7: First push-pull device; 701: First reaction frame; 702: First push-pull rod; 703: First support platform; 8: Second push-pull device; 801: Second reaction frame; 802: Second push-pull rod; 803: Second support platform; 9: Gas main pipe valve; 10: Partition plate; 11: Side cover; 12: Suspension rod; 13: Telescopic rod; 14: Pulley; 15: Purge hood slide rail; 16: First limiting block; 17: Second limiting block. Detailed Implementation

[0066] The technical solution of the present invention will be illustrated below with examples. The scope of protection sought by the present invention includes, but is not limited to, the following embodiments.

[0067] Please refer to Figures 1 to 6A scalable suspended pipe-type gas injection device includes a gas pipe, an injection pipe array, an injection hood, and a push-pull device. The injection hood includes several partitions 10 arranged parallel to the length of the sintering trolley, telescopic rods 13 with their ends perpendicularly connected to two adjacent partitions 10, and a foldable hood body with its ends connected to two adjacent partitions 10. The injection pipe array is suspended within the hood body by a suspension member. The injection pipe array includes several parallel injection pipes 5, and foldable connecting rods 6 with their ends connected to adjacent injection pipes 5. The injection pipes 5 communicate with the gas pipe located outside the injection hood, and each injection pipe 5 has several injection holes. Injection hood slide rails 15 are provided on both sides of the sintering trolley, and the injection hood slides on the injection hood slide rails 15. The push-pull device drives both ends of the injection hood to slide along the injection hood slide rails 15. The gas pipe is provided with a displacement compensation structure to accommodate the movement of the hood body.

[0068] Preferably, the suspension component includes a suspension rod 12 and a first limiting block 16. One end of the suspension rod 12 is rotatably connected to the partition 10, and the other end of the suspension rod 12 is rotatably connected to the blowpipe 5. A second limiting block 17 is provided on the partition 10, and the first limiting block 16 and the second limiting block 17 can abut against each other to restrict the rotation of the suspension rod 12 relative to the partition 10.

[0069] Preferably, the connecting rod 6 includes a first rod 601 and a second rod 603 that are rotatably connected to each other. The first rod 601 is provided with a third limiting block 602, and the second rod 603 is provided with a fourth limiting block 604. The third limiting block 602 and the fourth limiting block 604 can abut against each other to limit the relative rotation of the first rod 601 and the second rod 603.

[0070] Preferably, the cover includes a top cover and side covers 11 connected to both ends of the top cover. Both the top cover and the side covers 11 are made of flexible sealing material. The device also includes a manifold 3 and a connecting pipe 4. The connecting pipe 4 is a flexible hose. The manifold 3 is fixed to the side covers 11. The inlet of the manifold 3 communicates with the gas pipe, and the manifold 3 has several outlets corresponding one-to-one with the injection pipes 5, each outlet communicating with its corresponding injection pipe 5. The injection holes are located on the side of the injection pipe 5 facing the sintering trolley.

[0071] Preferably, the gas pipe includes a main gas pipe 1 and a plurality of branch gas pipes 2, each connected to the main gas pipe 1 and corresponding to a branch pipe 3. The displacement compensation structure includes flexible hose sections 102 and rigid pipe sections 101 arranged alternately on the main gas pipe 1. Each branch gas pipe 2 corresponds to a rigid pipe section 101, with one end of each branch gas pipe 2 connected to the corresponding rigid pipe section 101 and the other end connected to the corresponding branch pipe 3. The branch gas pipes 2 and rigid pipe sections 101 can move with the corresponding branch pipe 3. A main gas pipe valve 9 is provided on the main gas pipe 1.

[0072] Preferably, pulleys 14 are respectively provided at both ends of the bottom of the partition 10, and the pulleys 14 slide on the blown-out hood slide rails 15 on both sides of the sintering trolley. The push-pull device includes a first push-pull device 7 and a second push-pull device 8. The first push-pull device 7 drives one end of the blown-out hood to slide along the blown-out hood slide rail 15, and the second push-pull device 8 drives the other end of the blown-out hood to slide along the blown-out hood slide rail 15.

[0073] Preferably, the first push-pull device 7 is disposed at one end of the blow-off hood near the sintering machine head to adjust the starting position of the gas injection. There are two first push-pull devices 7, respectively disposed on both sides of the sintering trolley. Each first push-pull device 7 includes a first reaction frame 701, a first push-pull rod 702, and a first support platform 703. The first reaction frame 701 is disposed on the first support platform 703, the fixed end of the first push-pull rod 702 is fixed to the first reaction frame 701, and the movable end of the first push-pull rod 702 is connected to the partition plate 10 at the end of the blow-off hood near the sintering machine head.

[0074] Preferably, the second push-pull device 8 is located at the end of the blow-off hood furthest from the sintering machine head, for adjusting the gas injection coverage length. There are two second push-pull devices 8, respectively located on both sides of the sintering trolley. Each second push-pull device 8 includes a second reaction frame 801, a second push-pull rod 802, and a second support platform 803. The second reaction frame 801 is mounted on the second support platform 803. The fixed end of the second push-pull rod 802 is fixed to the second reaction frame 801, and the movable end of the second push-pull rod 802 is connected to the partition plate 10 at the end of the blow-off hood furthest from the sintering machine head.

[0075] Preferably, the telescopic rod 13 comprises multiple tubular sections with decreasing diameters that are nested sequentially. The telescopic rod 13 is disposed at least at both ends of the bottom of the partition plate 10.

[0076] Please refer to Figure 6A control method for a scalable suspended pipe gas injection device, applied to a scalable suspended pipe gas injection device. The method includes:

[0077] Step S1: Monitor the ignition surface characteristic parameters under the current working conditions, including: surface brightness, crack width, particle density, and surface color.

[0078] Step S2: Calculate the optimal gas injection start point position based on the ignition surface characteristic parameters:

[0079] ,

[0080] In the formula, The optimal distance from the gas injection start point to the sintering machine head is denoted in meters. The brightness of the material surface after ignition in the sintering machine is dimensionless. The width of the crack on the material surface after ignition in the sintering machine is expressed in meters (m). The particle density on the material surface after ignition in the sintering machine is dimensionless. The color of the material surface after ignition in the sintering machine is dimensionless. This is a dimensionless parameter for adjusting the starting point position of gas injection, with a value range of 1-10.

[0081] Step S3: Monitor the sintering multi-characteristic parameters under the current working conditions. The sintering multi-characteristic parameters include: material particle size, material moisture content, carbon content per ton of ore in the process, and process basicity value.

[0082] Step S4: Calculate the optimal gas injection coverage length based on multiple sintering characteristic parameters:

[0083] ,

[0084] In the formula, The optimal gas injection coverage length is in meters (m). The particle size of the sintering mixture is expressed in meters (m). The carbon content per ton of ore in the current operating condition of the sintering machine is expressed in kg / t. The moisture content of the sintering mixture is dimensionless. The alkalinity of the current process produced by the sintering machine is dimensionless. The parameter for adjusting the coverage length of the gas injection is t / kg, with a range of 10-50.

[0085] Step S5: Based on the optimal gas injection starting point and gas injection coverage length, combined with the current sintering machine output, hourly carbon consumption of the process, and venting volume per ton of ore in the process, calculate the current optimal gas injection rate:

[0086] ,

[0087] In the formula, For the optimal gas injection rate, m 3 / h. The output of the sintering machine is expressed in tons per hour (t / h). The ventilation volume per ton of ore in the process is expressed in m³. 3 / t. The optimal gas injection coverage length is in meters (m). The optimal distance from the gas injection start point to the sintering machine head is denoted in meters. The carbon consumption per hour for the sintering machine process is expressed in t / h. The gas injection rate adjustment coefficient is t / h, with a value range of 0-2.

[0088] Step S6: Adjust the starting position of the gas injection by the first push-pull device 7, adjust the gas injection coverage length of the injection hood by the second push-pull device 8, and adjust the gas injection volume by the gas main pipe valve 9.

[0089] Example 1

[0090] like Figure 1-6 As shown, a scalable suspended pipe-type gas injection device includes a gas pipe, an injection pipe array, an injection hood, and a push-pull device. The injection hood includes seven partitions 10 arranged parallel to each other along the length of the sintering trolley, telescopic rods 13 with their ends perpendicularly connected to two adjacent partitions 10, and a foldable hood body with its ends connected to two adjacent partitions 10. The injection pipe array is suspended within the hood body by a suspension member. The injection pipe array includes four parallel injection pipes 5, and foldable connecting rods 6 with their ends connected to adjacent injection pipes 5. The injection pipes 5 communicate with the gas pipe located outside the injection hood, and each injection pipe 5 has several injection holes. Injection hood slide rails 15 are provided on both sides of the sintering trolley, and the injection hood slides on the injection hood slide rails 15. The push-pull device drives both ends of the injection hood to slide along the injection hood slide rails 15. The gas pipe is equipped with a displacement compensation structure to accommodate the movement of the hood body.

[0091] Example 2

[0092] The embodiment 1 is repeated, except that the suspension component includes a suspension rod 12 and a first limiting block 16. One end of the suspension rod 12 is rotatably connected to the partition 10, and the other end of the suspension rod 12 is rotatably connected to the blowpipe 5. A second limiting block 17 is provided on the partition 10, and the first limiting block 16 and the second limiting block 17 can abut against each other to restrict the rotation of the suspension rod 12 relative to the partition 10.

[0093] Example 3

[0094] Repeat Embodiment 2, except that the connecting rod 6 includes a first rod 601 and a second rod 603 that are rotatably connected to each other. The first rod 601 is provided with a third limiting block 602, and the second rod 603 is provided with a fourth limiting block 604. The third limiting block 602 and the fourth limiting block 604 can abut against each other to limit the relative rotation of the first rod 601 and the second rod 603.

[0095] Example 4

[0096] The embodiment 3 is repeated, except that the cover includes a top cover and side covers 11 connected to both ends of the top cover. Both the top cover and the side covers 11 are made of ceramic fiber cloth with a polyimide coating on both sides. The device also includes a manifold 3 and a connecting pipe 4. The connecting pipe 4 is a flexible hose. The manifold 3 is fixed to the side covers 11. The inlet of the manifold 3 communicates with the gas pipe, and the manifold 3 has four outlets corresponding one-to-one with the injection pipes 5, each outlet communicating with its corresponding injection pipe 5. The injection holes are located on the side of the injection pipe 5 facing the sintering trolley.

[0097] Example 5

[0098] The embodiment 4 is repeated, except that the gas pipe includes a main gas pipe 1 and six branch gas pipes 2, each connected to the main gas pipe 1 and corresponding to a branch pipe 3. The displacement compensation structure includes flexible hose sections 102 and rigid pipe sections 101 arranged alternately on the main gas pipe 1. Each branch gas pipe 2 corresponds to a rigid pipe section 101, with one end of the branch gas pipe 2 connected to the corresponding rigid pipe section 101 and the other end connected to the corresponding branch pipe 3. The branch gas pipes 2 and rigid pipe sections 101 can move with the corresponding branch pipe 3. A main gas pipe valve 9 is provided on the main gas pipe 1.

[0099] Among them, the gas main valve 9 is an electric regulating valve.

[0100] Example 6

[0101] The embodiment 5 is repeated, except that pulleys 14 are respectively provided at both ends of the bottom of the partition 10, and the pulleys 14 slide on the blown-out hood slide rails 15 on both sides of the sintering trolley. The push-pull device includes a first push-pull device 7 and a second push-pull device 8. The first push-pull device 7 drives one end of the blown-out hood to slide along the blown-out hood slide rail 15, and the second push-pull device 8 drives the other end of the blown-out hood to slide along the blown-out hood slide rail 15.

[0102] Example 7

[0103] The embodiment 6 is repeated, except that the first push-pull device 7 is located at the end of the blow-off hood near the sintering machine head to adjust the starting position of the gas injection. There are two first push-pull devices 7, each located on one side of the sintering trolley. Each first push-pull device 7 includes a first reaction frame 701, a first push-pull rod 702, and a first support platform 703. The first reaction frame 701 is mounted on the first support platform 703. The fixed end of the first push-pull rod 702 is fixed to the first reaction frame 701, and the movable end of the first push-pull rod 702 is connected to the partition 10 at the end of the blow-off hood near the sintering machine head.

[0104] Among them, the first push-pull rod 702 is a multi-stage telescopic hydraulic cylinder.

[0105] Example 8

[0106] The embodiment 7 is repeated, except that the second push-pull device 8 is located at the end of the blown hood furthest from the sintering machine head, for adjusting the gas injection coverage length. There are two second push-pull devices 8, respectively located on both sides of the sintering trolley. Each second push-pull device 8 includes a second reaction frame 801, a second push-pull rod 802, and a second support platform 803. The second reaction frame 801 is mounted on the second support platform 803. The fixed end of the second push-pull rod 802 is fixed to the second reaction frame 801, and the movable end of the second push-pull rod 802 is connected to the partition 10 at the end of the blown hood furthest from the sintering machine head.

[0107] Among them, the second push-pull rod 802 is a multi-stage telescopic hydraulic cylinder.

[0108] Example 9

[0109] Example 8 is repeated, except that the telescopic rod 13 comprises multiple pipe sections with decreasing diameters and nested sequentially. The partition 10 is rectangular, and the four corners of two adjacent partitions 10 are connected by four telescopic rods 13 respectively.

[0110] Application Examples

[0111] With 360m 2 Taking a sintering machine as an example, the steps in applying the technology of this invention are as follows:

[0112] (1) The ignition surface feature parameters under the current working conditions are monitored and collected by the ignition surface visual recognition system to obtain the surface brightness. The width of the crack in the material surface is 7. The particle density of the material surface is 0.02m. The color of the material is 25. The value is 3, and the gas injection starting point position adjustment parameter 'a' is 8. Therefore, the current optimal gas injection starting point position can be calculated as follows:

[0113] m.

[0114] (2) Monitoring multiple characteristic parameters of the sintering machine under the current operating conditions: material particle size The carbon content per ton of ore in the process is 0.0035m. The moisture content of the material is 45 kg / t. The alkalinity value of the process is 9%. Given a value of 1.8 and a coverage length adjustment parameter b of 40 t / kg, the optimal gas injection coverage length can be calculated as follows:

[0115] m.

[0116] (3) Monitor the output of the sintering machine under the current operating conditions The ventilation rate is 480 t / h, which is the process ventilation rate per ton of ore. 21m 3 / t, carbon consumption per hour in sintering machine process The gas injection rate is 21.6 t / h, and the gas injection rate adjustment parameter c is set to 1.8 t / h. Combining the optimal position L of the gas injection start point distance from the sintering machine head and the optimal gas injection coverage length M, the current optimal gas injection rate is calculated as follows:

[0117] m 3 / h.

[0118] (4) After obtaining the above values, the system automatically adjusts the gas injection starting point to 9.3m away from the sintering machine head via the first push-pull device 7, adjusts the gas injection coverage length of the injection hood to 38.9m via the second push-pull device 8, and adjusts the gas injection volume to 3513.5m via the gas main pipe valve 9. 3 / h, thereby achieving optimal production conditions.

Claims

1. A scalable suspended pipe-type gas injection device, characterized in that: The system includes a gas pipe, a jet pipe array, a jet hood, and a push-pull device. The jet hood includes several partitions (10) arranged parallel to each other along the length of the sintering trolley, telescopic rods (13) with their ends perpendicularly connected to two adjacent partitions (10), and a foldable cover with its ends connected to two adjacent partitions (10). The jet pipe array is suspended in the cover by a suspension member. The jet pipe array includes several jet pipes (5) that are parallel to each other, and foldable connecting rods (6) with their ends connected to adjacent jet pipes (5). The jet pipes (5) are connected to the gas pipe located outside the jet hood, and the jet pipes (5) have several jet holes. The two sides of the sintering trolley are respectively provided with jet hood slide rails (15), and the jet hood slides on the jet hood slide rails (15). The push-pull device drives the two ends of the jet hood to slide along the jet hood slide rails (15). The gas pipe is equipped with a displacement compensation structure to accommodate the movement of the enclosure.

2. The scalable suspended pipe-type gas injection device according to claim 1, characterized in that: The suspension component includes a suspension rod (12) and a first limiting block (16); one end of the suspension rod (12) is rotatably connected to the partition (10), and the other end of the suspension rod (12) is rotatably connected to the blow pipe (5); a second limiting block (17) is provided on the partition (10), and the first limiting block (16) and the second limiting block (17) can abut against each other to restrict the rotation of the suspension rod (12) relative to the partition (10).

3. The scalable suspended pipe-type gas injection device according to claim 2, characterized in that: The connecting rod (6) includes a first rod (601) and a second rod (603) that are rotatably connected to each other. The first rod (601) is provided with a third limiting block (602), and the second rod (603) is provided with a fourth limiting block (604). The third limiting block (602) and the fourth limiting block (604) can abut against each other to restrict the relative rotation of the first rod (601) and the second rod (603).

4. The scalable suspended pipe-type gas injection device according to any one of claims 1 to 3, characterized in that: The cover includes a top cover and side covers (11) connected to both ends of the top cover; both the top cover and the side covers (11) are made of flexible sealing material; the device also includes a manifold (3) and a connecting pipe (4); the connecting pipe (4) is a flexible hose; the manifold (3) is fixed to the side covers (11); the inlet of the manifold (3) is connected to the gas pipe, and the manifold (3) is provided with a number of outlets corresponding to the injection pipe (5), and the outlets are connected to the corresponding injection pipe (5); the injection hole is opened on the side of the injection pipe (5) facing the sintering trolley.

5. The scalable suspended pipe-type gas injection device according to claim 4, characterized in that: The gas pipe includes a main gas pipe (1) and several branch gas pipes (2) that are connected to the main gas pipe (1) and correspond one-to-one with the manifold (3); the displacement compensation structure includes flexible hose sections (102) and rigid pipe sections (101) that are staggered on the main gas pipe (1); the branch gas pipes (2) and the rigid pipe sections (101) correspond one-to-one, one end of the branch gas pipe (2) is connected to the corresponding rigid pipe section (101), and the other end of the branch gas pipe (2) is connected to the corresponding manifold (3); the branch gas pipes (2) and the rigid pipe sections (101) can move with the corresponding manifold (3); a main gas pipe valve (9) is provided on the main gas pipe (1).

6. The scalable suspended pipe-type gas injection device according to any one of claims 1 to 5, characterized in that: The bottom ends of the partition (10) are respectively provided with pulleys (14), and the pulleys (14) slide on the blown hood slide rails (15) on both sides of the sintering trolley; the push-pull device includes a first push-pull device (7) and a second push-pull device (8); the first push-pull device (7) drives one end of the blown hood to slide along the blown hood slide rail (15), and the second push-pull device (8) drives the other end of the blown hood to slide along the blown hood slide rail (15).

7. The scalable suspended pipe-type gas injection device according to claim 6, characterized in that: The first push-pull device (7) is located at one end of the blow-blowing hood near the head of the sintering machine to adjust the starting position of the gas injection. There are two first push-pull devices (7), which are respectively located on both sides of the sintering trolley. The first push-pull device (7) includes a first reaction frame (701), a first push-pull rod (702), and a first support platform (703). The first reaction frame (701) is located on the first support platform (703). The fixed end of the first push-pull rod (702) is fixed to the first reaction frame (701), and the movable end of the first push-pull rod (702) is connected to the partition (10) at one end of the blow-blowing hood near the head of the sintering machine.

8. The scalable suspended pipe-type gas injection device according to claim 7, characterized in that: The second push-pull device (8) is located at the end of the blow-blown hood furthest from the sintering machine head, for adjusting the gas blowing coverage length; there are two second push-pull devices (8), which are respectively located on both sides of the sintering trolley; the second push-pull device (8) includes a second reaction frame (801), a second push-pull rod (802), and a second support platform (803); the second reaction frame (801) is located on the second support platform (803), the fixed end of the second push-pull rod (802) is fixed to the second reaction frame (801), and the movable end of the second push-pull rod (802) is connected to the partition (10) at the end of the blow-blown hood furthest from the sintering machine head.

9. The scalable suspended pipe-type gas injection device according to any one of claims 1 to 8, characterized in that: The telescopic rod (13) includes multiple pipe sections with decreasing diameters and nested in sequence; the telescopic rod (13) is provided at least at both ends of the bottom of the partition (10).

10. A control method for a scalable suspended pipe-type gas injection device, characterized in that: Applied to the scalable suspended pipe gas injection device as described in any one of claims 1 to 9; The method includes: Step S1: Monitor the ignition surface characteristic parameters under the current working conditions, including: surface brightness, crack width, particle density, and surface color. Step S2: Calculate the optimal gas injection start point position based on the ignition surface characteristic parameters: ， In the formula, The optimal distance from the gas injection start point to the sintering machine head is denoted in meters (m). The brightness of the material surface after ignition in the sintering machine is dimensionless. The width of the crack on the material surface after ignition in the sintering machine, in meters (m). The particle density on the material surface after ignition in the sintering machine is dimensionless. The color of the material surface after ignition of the sintering machine is dimensionless. This is a dimensionless parameter for adjusting the starting point position of gas injection, with a value range of 1-10. Step S3: Monitor the sintering multi-characteristic parameters under the current working conditions. The sintering multi-characteristic parameters include: material particle size, material moisture content, carbon content per ton of ore in the process, and process basicity value. Step S4: Calculate the optimal gas injection coverage length based on multiple sintering characteristic parameters: ， In the formula, The optimal gas injection coverage length is given in meters. The particle size of the sintering mixture is expressed in meters (m). The carbon content per ton of ore in the current operating condition of the sintering machine is expressed in kg / t. Moisture content of the sintering mixture, dimensionless; The alkalinity of the current process produced by the sintering machine is dimensionless. The parameter for adjusting the gas injection coverage length is t / kg, with a range of 10-50. Step S5: Based on the optimal gas injection starting point and gas injection coverage length, combined with the current sintering machine output, hourly carbon consumption of the process, and venting volume per ton of ore in the process, calculate the current optimal gas injection rate: ， In the formula, For the optimal gas injection rate, m 3 / h; The output of the sintering machine is expressed in tons per hour (t / h). The ventilation volume per ton of ore in the process is expressed in m³. 3 / t; The optimal gas injection coverage length is given in meters. The optimal distance from the gas injection start point to the sintering machine head is denoted in meters (m). The carbon consumption per hour for the sintering machine process is expressed in tons per hour (t / h). The gas injection rate adjustment coefficient is t / h, with a value range of 0-2. Step S6: Adjust the starting position of gas injection by the first push-pull device (7), adjust the gas injection coverage length of the injection hood by the second push-pull device (8), and adjust the gas injection volume by the gas main pipe valve (9).

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