Fuel gas injection full-section sintering end point adjusting method and system based on tail image

Abstract

The invention discloses a gas injection full-section sintering end point adjusting method and system based on a tail image, and the method comprises the steps: obtaining the tail image of a current sintering pallet, the tail image comprises an image grate-layer material layer and an image sintering interval, the image grate-layer material layer maps a real grate-layer material layer of a real section image, and the image sintering interval corresponds to the real grate-layer material layer; the image sintering interval maps a real sintering cross-section area of the real cross-section image; determining a raw material interval of the real sintering section area according to the tail image; if the raw material interval is the continuous interval, the current fuel gas injection amount of the fixed injection device is increased; and if the raw material interval is the discontinuous interval, the movable injection device is moved to the position above the discontinuous interval, and fuel gas auxiliary injection is conducted through the movable injection device. According to the fuel gas injection full-section sintering end point adjusting method based on the tail image, the technical problem that only coarse adjustment of the sintering end point is carried out when fuel gas injection is used for assisting sintering in the prior art is solved, and the sintering efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of sintering, and in particular to a method and system for adjusting the end point of gas injection full-section sintering based on a tail image. Background Art

[0002] With the rapid development of modern industry, the scale of steel production is getting larger and larger, and energy consumption is also increasing. Energy conservation and environmental protection indicators are becoming more and more important factors to consider in the steel production process. In steel production, iron-containing raw ore needs to be processed by the sintering system before entering the blast furnace for smelting. That is, various powdered iron-containing raw materials are mixed with appropriate amounts of fuel (coal powder, coke powder) and flux, and appropriate amounts of water. After mixing and balling, they are placed on the sintering trolley for roasting, so that a series of physical and chemical changes occur, forming sintered ore that is easy to smelt. This process is called sintering.

[0003] In the prior art, the techniques for controlling the sintering end point can be classified into three categories: one is to control the sintering end point by controlling the sintering trolley speed; the second is to control the sintering end point by controlling the sintering main exhaust fan system (negative pressure, air volume); the third is to control the sintering end point by controlling the thickness of the sintering material layer. The existing methods of controlling the sintering end point do not take into account the characteristics of the material layer and the inconsistency of materials in different areas of the sintering trolley before and after the actual sintering, and only roughly adjust the sintering end point.

[0004] In view of this, it is necessary to propose a method and system for adjusting the end point of full-section sintering by gas injection based on tail image to alleviate the above defects. Summary of the invention

[0005] The invention provides a method and system for adjusting the end point of full-section sintering by gas injection based on tail image, which solves the technical problem of only roughly adjusting the end point of sintering when gas injection is used to assist sintering.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A method for adjusting the end point of full-section sintering by gas injection based on a tail image, which is used for a full-section sintering adjustment system by gas injection based on a tail image. The full-section sintering adjustment system by gas injection based on a tail image comprises a sintering machine, a sintering trolley, an imaging acquisition device and a gas injection device. The gas injection device is in a gas injection area. The sintering trolley is movably arranged along the sintering machine head wheel toward the sintering machine tail wheel. The end of the sintering machine close to the sintering machine head wheel is provided with a material distribution area, an ignition furnace area and a holding furnace area in sequence. The gas injection device is downstream of the holding furnace area. The gas injection device comprises a fixed injection device and a movable injection device. The fixed injection device comprises a plurality of fixed gas injection pipes evenly spaced along the width of the vehicle. Each fixed gas injection pipe is provided with a fixed gas regulating valve for regulating the flow rate. The movable injection device comprises a plurality of fixed gas injection pipes evenly spaced along the width of the vehicle. The invention comprises at least one movable gas blowing pipe which can be movably arranged along the width direction of the trolley, and each movable gas blowing pipe is provided with a movable gas regulating valve; and comprises the following steps: S10, obtaining the tail image of the current sintering trolley, the tail image and the real cross-sectional image of the current sintering trolley have a known correlation ratio, the tail image has an image base material layer and an image sintering interval, the image base material layer maps the real base material layer of the real cross-sectional image, and the image sintering interval maps the real sintering cross-sectional area of ​​the real cross-sectional image; S20, determining the raw material interval of the real sintering cross-sectional area according to the tail image; S30, if the raw material interval is a continuous interval, increasing the current gas blowing amount of the fixed blowing device; if the raw material interval is an intermittent interval, moving the movable blowing device to the top of the intermittent interval and performing gas-assisted blowing through the movable blowing device.

[0008] Furthermore, the tail image includes a sintering cross-section thermal image, the base material layer of the sintering cross-section thermal image maps the real base material layer of the real cross-section image, and the sintering interval of the sintering cross-section thermal image maps the real sintering cross-section area of ​​the real cross-section image; the real base material layer and the real sintering cross-section area of ​​the sintering material of the current sintering trolley are obtained according to the sintering cross-section thermal image; the highest temperature interval of the real sintering cross-section area is obtained according to the sintering interval of the sintering cross-section thermal image, and if the temperature value of the highest temperature interval is 1000°C to 1280°C, the material interval between the highest temperature interval and the real base material layer is determined to be the raw material interval.

[0009] Furthermore, if the current temperature interval value of the highest temperature interval is less than the preset ignition temperature threshold, a prompt message is issued.

[0010] Furthermore, the tail image includes visible light imaging of the sintering section, the base material layer of the visible light imaging of the sintering section maps the real base material layer of the real section image, the sintering interval of the visible light imaging of the sintering section maps the real sintering section area of ​​the real section image, the visible light imaging of the sintering section has an imaging bright area, and the imaging bright area maps the current burning bright layer of the real sintering section area; the real base material layer and the current burning bright layer of the sintering material of the current sintering trolley are obtained according to the visible light imaging of the sintering section; the material interval between the current burning bright layer and the real base material layer is determined to be the raw material interval.

[0011] Furthermore, the step of "if the raw material interval is a continuous interval, increasing the current gas injection amount of the fixed injection device" specifically includes: obtaining the raw material ratio of the raw material cross-sectional area of ​​the raw material interval to the area of ​​the actual sintering cross-sectional area; if the raw material ratio is greater than a first threshold value, increasing the current gas injection amount of the fixed injection device by a first estimated increase, and the first estimated increase is the product of the raw material ratio and the current gas injection amount.

[0012] Furthermore, if the raw material ratio is not greater than the first threshold value, the current fuel gas injection amount of the fixed injection device is increased by a first estimated increase, and the first estimated increase is 3% to 10% of the current injection flow rate.

[0013] Furthermore, the step of "if the raw meal interval is an intermittent interval, move the active blowing device to the top of the intermittent interval and perform gas-assisted blowing through the active blowing device" specifically includes: if the raw meal interval is an intermittent interval, determine whether the raw meal interval belongs to the edge sintering zone or the middle sintering zone, wherein the middle area of ​​the actual sintering cross-sectional area is the middle sintering zone, and the edge sintering zone is on both sides of the middle sintering zone; if the raw meal interval is the middle sintering zone, move the active blowing device to the gas blowing area corresponding to the middle cross-sectional position of the raw meal interval and perform gas-assisted blowing.

[0014] Furthermore, if the raw material interval is an edge sintering zone, the highest position point of the edge sintering zone is obtained, and the movable blowing device is moved to the gas blowing area corresponding to the highest position point of the raw material interval and gas-assisted blowing is performed.

[0015] The present invention also provides a sintering control system based on gas injection assisted sintering, including a sintering machine, a sintering trolley, an imaging acquisition device and a gas injection device, the imaging acquisition device is arranged on the outside of the sintering machine tail wheel of the sintering machine, and the imaging acquisition device is used to acquire the tail image of the current sintering trolley; it also includes a processing device, and the processing device is used to execute the steps of the above-mentioned gas injection full-section sintering endpoint adjustment method based on the tail image.

[0016] The present invention has the following beneficial effects:

[0017] The method for adjusting the end point of full-section sintering by gas injection based on tail image provided by the present invention is based on the research on sintering technology. The real sintering cross-section area of ​​the trolley sintering cross-section is mapped by the tail image, and finally the raw material interval of the real sintering cross-section area is determined based on the analysis of the image. If the raw material interval is a continuous interval, the current gas injection amount of the fixed injection device is increased; if the raw material interval is an intermittent interval, the movable injection device is moved to the top of the intermittent interval and gas-assisted injection is performed through the movable injection device. Finally, targeted processing is performed according to the characteristics of the raw material interval to reduce the generation of sintering raw materials. This solves the technical problem of only roughly adjusting the sintering end point when using gas injection to assist sintering, which is beneficial to improving the sintering efficiency.

[0018] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 It is the process flow chart of the existing sintering system;

[0021] Figure 2 This is a schematic diagram of the existing sinter formation, where: Figure 2 a is the existing sinter formation process diagram, Figure 2 b is the existing sinter formation cross-section diagram, Figure 2 c is the completed cross-section of the existing sintered ore;

[0022] Figure 3 It is a cross-sectional diagram of sintered ore formation in the gas injection full-section sintering endpoint adjustment method based on the tail image of the present invention;

[0023] Figure 4 The sintering control system based on gas injection assisted sintering in one embodiment of the present invention

[0024] Figure 5 It is a partial schematic diagram of a sintering control system based on gas injection assisted sintering in one embodiment of the present invention;

[0025] Figure 6 It is a thermal imaging schematic diagram of a method for adjusting the end point of gas injection full-section sintering based on a tail image in one embodiment of the present invention;

[0026] Figure 7 Book Figure 6 Schematic diagram of the corresponding real cross-section image

[0027] Figure 8 It is a schematic diagram of visible light imaging of a method for adjusting the end point of gas injection full-section sintering based on a tail image in one embodiment of the present invention;

[0028] Fig. 9 yes Figure 8 Schematic diagram of the corresponding real cross-section image;

[0029] Fig.10 It is a flow chart of a method for adjusting the end point of full-section sintering by gas injection based on tail image in one embodiment of the present invention. DETAILED DESCRIPTION

[0030] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] The sintering system mainly includes sintering trolley, mixer, main exhaust fan, ring cooler and other equipment. Figure 1As shown in the figure: various raw materials are proportioned in the batching room to form a mixture. After the mixture enters the mixer for mixing and balling, it is evenly spread on the sintering trolley through the round roller feeder and the nine-roller distributor to form a sintering mixture layer. The ignition fan and the ignition fan start the ignition furnace, and the sintering mixture on the top layer of the sintering trolley is ignited in the ignition furnace. The ignited combustion zone begins to move from top to bottom, and the mixture passing through the combustion zone is roasted into sintered ore. This is the sintering process. The sintered ore obtained after sintering is crushed by a single roller crusher and then cooled in an annular cooler. Finally, it is sent to the blast furnace or the finished ore bin after screening and granulation. Among them, the oxygen required for the sintering process is provided by the main exhaust fan. There are multiple vertically arranged bellows under the sintering trolley. Under the bellows is a horizontally placed large flue (or flue). The large flue is connected to the main exhaust fan. The negative pressure wind generated by the main exhaust fan through the large flue and the bellows passes through the trolley to provide combustion-supporting air for the sintering process.

[0035] Please refer to Figure 2 ( Figure 2 a. Figure 2 b and Figure 2 c) During the sintering process, the ignited combustion zone moves from top to bottom, and the moving speed of the combustion zone is the vertical sintering speed; the sintering trolley moves from the head to the tail of the sintering machine, and the moving speed of the sintering trolley is the sintering machine speed; when the combustion zone moves to the bottom of the sintering trolley mixture, the corresponding position of the sintering trolley relative to the head of the sintering machine is the sintering end point. Figure 2 As shown in a, with the movement of the sintering trolley, the combustion zone gradually moves downward, and the mixed material passing through the combustion zone is roasted into sintered ore; Figure 2 As shown in b, during the sintering process, the materials in the sintering trolley can be divided into a bottom material layer, a mixed material layer, a combustion zone layer, and a sintered ore layer from bottom to top. Figure 2 As shown in c, when the combustion zone moves to the bed material layer, the materials in the sintering trolley have all been roasted into sintered ore. At this time, the corresponding position is the sintering end position, which is generally represented by the bellows number. Optionally, the combustion zone layer has a certain thickness, and the sintering end position can be understood as the bottom of the combustion zone just touching the bed material layer. When the sintering end position is controlled at the second to last bellows or the first to last bellows, no raw material will be produced, the fuel utilization rate is high, and the sintering efficiency is high.

[0036] In one embodiment of the present invention, the sintering end position is controlled to be the target sintering end position when the position of the second to last bellows or the first to last bellows is set. Figure 2As shown in b, the speed at which the combustion zone moves downward is called the sintering speed, which is represented by LV, in millimeters.min-1; the thickness of the material layer on the sintering machine is represented by H, in millimeters; there is a base material under the sintering mixture, which is a finished sintered ore of a certain particle size, and its thickness can be represented by PH, in millimeters; in the process of stable sintering production, the sintering speed is considered to be a constant value. After the sintered ore passes through the ignition furnace and starts the sintering process, its sintering time ST (in min) is

[0037] ST = (H-PH) / LV (1)

[0038] Controlling the sintering end point to the target sintering end point position is an important means of sintering control. During the sintering process, after the mixed material is laid on the sintering trolley, controlling the sintering end point at the last bellows or the second to last bellows of the sintering machine can achieve the most reasonable use of the sintering machine area. The corresponding sintering section at this time is as follows Figure 2 c; that is, the ideal sintering end position can be regarded as a position point within a fixed distance from the ignition position of the sintering material surface; that is, the moving distance S of the rear car after the ignition of the sintering material surface has an optimal value S0, and the position corresponding to S0 is the target sintering end position.

[0039] like Figure 2 As shown in a, within the sintering time ST, the relationship between the sintering machine trolley moving distance S (unit: m), the sintering machine trolley speed SV (unit: m / min), and the sintering time ST is shown in Formula 2:

[0040] S=ST*SV (2)

[0041] Available

[0042]

[0043] In summary, the existing technologies for controlling the sintering endpoint can be divided into three categories: the existing methods for controlling the sintering endpoint are relatively simple and have the technical problem of being too dependent on the main structure of the sintering system.

[0044] Please refer to Figure 3Through the study of sintering technology, it is found that during the sintering process, injecting gas into the sintering material and using gas instead of carbon to participate in the sintering process can affect the vertical combustion speed, thereby affecting the sintering end position. Specifically, after the gas is sprayed onto the sintering material surface, it enters the sintering material layer with the air. When the gas reaches the temperature area above the solid combustion zone that is higher than the gas combustion point, the gas is ignited to form a gas combustion zone suspended above the solid combustion zone; the gas combustion zone will burn downward synchronously with the solid combustion zone, and the heat released by the gas combustion zone will be quickly conducted downward and superimposed on the solid combustion zone, thereby accelerating the combustion speed of the solid combustion zone and increasing the combustion temperature of the solid combustion zone. In practical applications, considering the safety of gas and other issues, the maximum volume fraction of gas injection is 0.8%, that is, the volume of gas blown into the sintering material surface is at most 0.8% of the volume of air entering the sintering material surface; (wherein, there are solutions to the problems of nozzle arrangement and sufficient mixing of gas and air, which are not discussed in this case); the oxygen in the air consumed by the combustion of gas with a volume fraction of less than 0.8% has basically no effect on the combustion of solid fuel in the sintered ore. In the present invention, the volume fraction can be linearly converted to the flow rate of the gas regulating valve, for example, the volume fraction of the gas is 0.8% at the maximum flow rate, and the volume fraction of the gas is 0.4% at 0.5 times the maximum flow rate; at the same time, because the main component of the fuel involved in the batching during the sintering process is coke powder, and the main component of the gas is hydrocarbon fuel and hydrogen, such as natural gas and coke oven gas contain a large amount of hydrogen, so after the addition of gas injection, the carbon emissions of the sintering process are reduced.

[0045] Since the raw material conditions, gas conditions, equipment models and specifications of each sintering plant are different, it is impossible to quantitatively give the relationship between gas injection and vertical sintering speed that is suitable for all sintering plants, but the basic relationship can be determined as follows: the more heat value input through gas injection, the faster the vertical sintering speed of the sintering machine; vice versa. Because the raw material conditions, gas conditions, and equipment status of each specific sintering machine are basically stable within a certain working cycle, the corresponding relationship between the gas injection working condition and the vertical sintering speed of the sintering machine can be established by matching historical data, establishing a neural network model, linear equations, etc.

[0046] Please refer to Figure 4 and Figure 5The present invention provides a sintering endpoint control system based on gas injection assisted sintering, a gas injection full-section sintering control system based on tail image, and a gas injection full-section sintering control system based on tail image, which includes a sintering machine, a sintering trolley, an imaging acquisition device and a gas injection device, wherein the gas injection device is in a gas injection area, the sintering trolley is movably arranged along the sintering machine head wheel toward the sintering machine tail wheel, the sintering machine is close to the sintering machine head wheel. The end of the sintering machine is provided with a material distribution area, an ignition furnace area and a holding furnace area in sequence, and the gas injection device is downstream of the holding furnace area. The gas injection device includes a fixed injection device and a movable injection device, the fixed injection device includes a plurality of fixed gas injection pipes evenly spaced along the width direction of the vehicle, each fixed gas injection pipe is provided with a fixed gas regulating valve Fi for regulating flow, and the movable injection device includes at least one movable gas injection pipe movably arranged along the width direction of the trolley, and each movable gas injection pipe is provided with a movable gas regulating valve.

[0047] Optionally, the gas injection zone is arranged adjacent to the heat preservation furnace zone, and a gas injection device including a fixed injection device and a movable injection device is arranged in the gas injection zone. The fixed gas injection pipe corresponds to a lateral section of the tail image.

[0048] In a specific embodiment of the present invention, the tail image is evenly divided into five areas, and five fixed gas injection pipes are provided, and the fixed gas injection pipes are provided corresponding to a single area of ​​the tail image.

[0049] Please refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10The present invention provides a gas-blowing full-section sintering endpoint adjustment method based on a tail image, which is used for a gas-blowing full-section sintering adjustment system based on a tail image. The gas-blowing full-section sintering adjustment system based on a tail image comprises a sintering machine, a sintering trolley, an imaging acquisition device and a gas-blowing device. The gas-blowing device is in a gas-blowing area. The sintering trolley is movably arranged along a sintering machine head wheel toward a sintering machine tail wheel. A material distribution area, an ignition furnace area and a heat preservation furnace area are sequentially arranged at one end of the sintering machine near the sintering machine head wheel. The gas-blowing device is downstream of the heat preservation furnace area. The gas-blowing device comprises a fixed-blowing device and a movable-blowing device. The fixed-blowing device comprises a plurality of fixed-gas-blowing pipes evenly spaced along a vehicle width direction. Each fixed-gas-blowing pipe is provided with a fixed-gas regulating valve Fi for regulating flow rate. The movable-blowing The blowing device includes at least one movable gas blowing pipe movably arranged along the width direction of the trolley, and each movable gas blowing pipe is provided with a movable gas regulating valve; it includes the following steps: S10, obtaining the tail image of the current sintering trolley, the tail image and the real cross-sectional image of the current sintering trolley have a known correlation ratio, the tail image has an image base material layer and an image sintering interval, the image base material layer maps the real base material layer of the real cross-sectional image, and the image sintering interval maps the real sintering cross-sectional area of ​​the real cross-sectional image; S20, determining the raw material interval of the real sintering cross-sectional area according to the tail image; S30, if the raw material interval is a continuous interval, increasing the current gas blowing amount of the fixed blowing device; if the raw material interval is an intermittent interval, moving the movable blowing device to the top of the intermittent interval and performing gas-assisted blowing through the movable blowing device.

[0050] The method for adjusting the end point of full-section sintering by gas injection based on tail image provided by the present invention is based on the research on sintering technology. The real sintering cross-section area of ​​the trolley sintering cross-section is mapped by the tail image, and finally the raw material interval of the real sintering cross-section area is determined based on the analysis of the image. If the raw material interval is a continuous interval, the current gas injection amount of the fixed injection device is increased; if the raw material interval is an intermittent interval, the movable injection device is moved to the top of the intermittent interval and gas-assisted injection is performed through the movable injection device. Finally, targeted processing is performed according to the characteristics of the raw material interval to reduce the generation of sintering raw materials. This solves the technical problem of only roughly adjusting the sintering end point when using gas injection to assist sintering, which is beneficial to improving the sintering efficiency.

[0051] It can be understood that the tail image can be a thermal image of the sintering cross section or a visible light image.

[0052] If the tail image is a sintering cross-section thermal image, the image base material layer of the sintering cross-section thermal image maps the real base material layer of the real cross-section image, and the image sintering interval of the sintering cross-section thermal image maps the real sintering cross-section area of ​​the real cross-section image; the real base material layer and the real sintering cross-section area of ​​the sintering material of the current sintering trolley are obtained according to the sintering cross-section thermal image; the highest temperature interval of the real sintering cross-section area is obtained according to the image sintering interval of the sintering cross-section thermal image, and if the temperature value of the highest temperature interval is 1000℃ to 1280℃, the material interval between the highest temperature interval and the real base material layer is determined to be the raw material interval. Specifically, the material interval with a temperature value of 1000℃ to 1280℃ is determined to be the critical sintering interval or the cooling interval after sintering is completed.

[0053] If the tail image is a visible light imaging of the sintering section, the base material layer of the visible light imaging of the sintering section maps the real base material layer of the real section image, the sintering interval of the visible light imaging of the sintering section maps the real sintering section area of ​​the real section image, and the visible light imaging of the sintering section has an imaging bright area, and the imaging bright area maps the current burning bright layer of the real sintering section area; the real base material layer and the current burning bright layer of the sintering material of the current sintering trolley are obtained according to the visible light imaging of the sintering section; the material interval between the current burning bright layer and the real base material layer is determined to be the raw material interval. It can be understood that thermal imaging technology belongs to the prior art. Through thermal imaging technology, the thermal imaging temperature partition interval of the real sintering section area can be obtained. Optionally, the temperature range value of the highest temperature interval is 1000℃ to 1280℃. If the thermal imaging accuracy is divided into one level every 50℃, the actual sintering cross-sectional area has 800-850℃ interval, 850-900℃ interval, 900-950℃ interval, 950-1000℃ interval and interval below 800℃. At this time, the 950-1000℃ interval is determined to be the highest temperature interval.

[0054] It can be understood that visible light imaging technology belongs to the prior art. Sintering cross-section visible light imaging usually includes visible light imaging black area and visible light imaging bright area, and the visible light imaging black area includes a visible light base material layer and a visible light sintering area, wherein the visible light base material layer maps the real base material layer of the current sintering trolley, and the sintering material in the area between the visible light imaging bright area and the visible light base material layer is sintering raw material (before reaching the sintering end point, the actual combustion zone has not burned to the base material interval position), and the sintering material in the visible light imaging bright area and the sintering material above the visible light imaging bright area are sintering clinker. Specifically, the visible light imaging bright area maps the combustion area of ​​the real cross-sectional image.

[0055] Furthermore, if the current temperature interval value of the highest temperature interval is less than the preset ignition temperature threshold, a prompt message is issued. It can be understood that if the sintering trolley fails to ignite, the sintering material has not completed sintering. At this time, the current sintering critical temperature interval is the entire sintering section interval, and the thermal imaging temperature of the entire sintering section interval will be lower than 600°C. In the present invention, the preset ignition temperature threshold is set to 600°C.

[0056] Furthermore, the step of "if the raw material interval is a continuous interval, increase the current gas injection amount of the fixed injection device" specifically includes: obtaining the raw material ratio of the raw material cross-sectional area of ​​the raw material interval to the area of ​​the actual sintering cross-sectional area; if the raw material ratio is greater than the first threshold, increase the current gas injection amount of the fixed injection device by the first estimated increase, and the first estimated increase is the product of the raw material ratio and the current gas injection amount. It can be understood that the first threshold is 10% to 20%. In a specific embodiment of the present invention, the first threshold is 15%. If the raw material ratio is 25%, at this time, the first estimated increase is 0.25 times the current gas injection amount, thereby achieving a large proportion of regulation.

[0057] Furthermore, if the raw material ratio is not greater than the first threshold, the current gas injection amount of the fixed injection device is increased by a first estimated increase, and the first estimated increase is 3% to 10% of the current injection flow rate, thereby achieving fine adjustment.

[0058] Furthermore, the step of "if the raw meal interval is an intermittent interval, move the active blowing device to the top of the intermittent interval and perform gas-assisted blowing through the active blowing device" specifically includes: if the raw meal interval is an intermittent interval, determine whether the raw meal interval belongs to the edge sintering zone or the middle sintering zone, wherein the middle area of ​​the actual sintering cross-sectional area is the middle sintering zone, and the edge sintering zone is on both sides of the middle sintering zone; if the raw meal interval is the middle sintering zone, move the active blowing device to the gas blowing area corresponding to the middle cross-sectional position of the raw meal interval and perform gas-assisted blowing.

[0059] In the specific implementation, it is determined whether the raw material interval belongs to the edge sintering zone or the middle sintering zone, wherein the raw material interval in the middle area of ​​the real sintering cross-sectional area is the middle sintering zone, and the edge sintering zone is on both sides of the middle sintering zone; if the raw material interval is the middle sintering zone, (the gas injection amount in the middle is more obvious and is easy to diffuse to both sides laterally), the active injection device is moved to the gas injection area corresponding to the middle cross-sectional position of the raw material interval and gas-assisted injection is performed. If the raw material interval is the edge sintering zone, the highest position point of the edge sintering zone is obtained, and the active injection device is moved to the gas injection area corresponding to the highest position point of the raw material interval and gas-assisted injection is performed, which is conducive to precise adjustment.

[0060] Furthermore, the number of fixed gas injection pipes is 3-5, the number of mobile gas injection pipes is 2-4, and the number of partitions of the tail image is consistent with the number of fixed gas injection pipes. If the number of partitions of the tail image is 3, then one partition in the middle part is the middle sintering area; if the number of partitions of the tail image is 4, then two partitions in the middle part are the middle sintering area; if the number of partitions of the tail image is 5, then three partitions in the middle part are the middle sintering area.

[0061] The present invention also provides a sintering control system based on gas injection assisted sintering, including a sintering machine, a sintering trolley, an imaging acquisition device and a gas injection device, the imaging acquisition device is arranged on the outside of the sintering machine tail wheel of the sintering machine, and the imaging acquisition device is used to acquire the tail image of the current sintering trolley; it also includes a processing device, and the processing device is used to execute the steps of the above-mentioned gas injection full-section sintering endpoint adjustment method based on the tail image.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for adjusting the end point of full-section sintering by gas injection based on tail image, characterized in that: A gas-injected full-section sintering adjustment system based on a tail image, the gas-injected full-section sintering adjustment system based on a tail image comprises a sintering machine, a sintering trolley, an imaging acquisition device and a gas-injected device, the gas-injected device is in a gas-injected area, the sintering trolley is movably arranged along the sintering machine head wheel toward the sintering machine tail wheel, the sintering machine is provided with a material distribution area, an ignition furnace area and a holding furnace area in sequence at one end close to the sintering machine head wheel, the gas-injected device is downstream of the holding furnace area, the gas-injected device comprises a fixed-injected device and a movable-injected device, the fixed-injected device comprises a plurality of fixed-gas-injected pipes evenly spaced along the width direction of the vehicle, each of the fixed-gas-injected pipes is provided with a fixed-gas regulating valve for regulating the flow rate, the movable-injected device comprises at least one movable-gas-injected pipe movably arranged along the width direction of the trolley, each of the movable-gas-injected pipes is provided with a movable-gas regulating valve; The steps include: S10, acquiring a tail image of the current sintering trolley, wherein the tail image has a known correlation ratio with the real cross-sectional image of the current sintering trolley, and the tail image has an image base material layer and an image sintering interval, wherein the image base material layer maps the real base material layer of the real cross-sectional image, and the image sintering interval maps the real sintering cross-sectional area of ​​the real cross-sectional image; S20, determining the raw material interval of the actual sintering cross-sectional area according to the tail image; S30, if the raw material interval is a continuous interval, increase the current gas injection amount of the fixed injection device; if the raw material interval is an intermittent interval, move the movable injection device to the top of the intermittent interval and perform gas-assisted injection through the movable injection device.

2. The method for adjusting the end point of gas injection full-section sintering based on tail image according to claim 1 is characterized in that: The tail image includes a sintered cross-section thermal image, the image base material layer of the sintered cross-section thermal image maps the real base material layer of the real cross-section image, and the image sintering interval of the sintered cross-section thermal image maps the real sintered cross-section area of ​​the real cross-section image; Acquire a real bottom material layer and a real sintering cross-sectional area of ​​the trolley sintering material of the current sintering trolley according to the sintering cross-section thermal imaging; The highest temperature interval of the actual sintering cross-sectional area is obtained according to the image sintering interval of the sintering cross-sectional thermal imaging. If the temperature value of the highest temperature interval is 1000°C to 1280°C, the material interval between the highest temperature interval and the actual base material layer is determined to be the raw material interval.

3. The method for adjusting the end point of gas injection full-section sintering based on tail image according to claim 2 is characterized in that: If the current temperature interval value of the highest temperature interval is less than the preset ignition temperature threshold, a prompt message is issued.

4. The method for adjusting the end point of gas injection full-section sintering based on tail image according to claim 1 is characterized in that: The tail image includes a sintered cross-section visible light imaging, wherein the image base material layer of the sintered cross-section visible light imaging maps the real base material layer of the real cross-section image, the image sintering interval of the sintered cross-section visible light imaging maps the real sintered cross-section area of ​​the real cross-section image, and the sintered cross-section visible light imaging has an imaging bright area, and the imaging bright area maps the current burning bright layer of the real sintered cross-section area; Acquire the real bottom material layer and the current burning bright layer of the sintering material of the current sintering trolley according to the visible light imaging of the sintering section; The material interval between the current burning bright layer and the actual base material layer is determined as the raw material interval.

5. The method for adjusting the end point of gas injection full-section sintering based on tail image according to any one of claims 1 to 4, characterized in that: The step of "if the raw material interval is a continuous interval, increasing the current fuel gas injection amount of the fixed injection device" specifically includes: Obtaining a raw material ratio of a raw material cross-sectional area of ​​the raw material interval to an area of ​​the actual sintering cross-sectional area; If the raw material ratio is greater than a first threshold, the current gas injection amount of the fixed injection device is increased by a first estimated increase, wherein the first estimated increase is the product of the raw material ratio and the current gas injection amount.

6. The method for adjusting the end point of gas injection full-section sintering based on tail image according to claim 5 is characterized in that: If the raw material ratio is not greater than the first threshold, the current fuel gas injection amount of the fixed injection device is increased by a first estimated increase, and the first estimated increase is 3% to 10% of the current injection flow rate.

7. The method for adjusting the end point of gas injection full-section sintering based on tail image according to any one of claims 1 to 4, characterized in that: The step of "if the raw material interval is an intermittent interval, moving the movable blowing device to the top of the intermittent interval and performing gas-assisted blowing through the movable blowing device" specifically includes: If the raw material interval is a discontinuous interval, determine whether the raw material interval belongs to an edge sintering zone or a middle sintering zone, wherein the middle area of ​​the real sintering cross-sectional area is the middle sintering zone, and the edge sintering zones are located on both sides of the middle sintering zone; If the raw material interval is the middle sintering zone, the movable blowing device is moved to the gas blowing area corresponding to the middle cross-section position of the raw material interval and gas-assisted blowing is performed.

8. The method for adjusting the end point of gas injection full-section sintering based on tail image according to claim 7 is characterized in that: If the raw material interval is the edge sintering zone, the highest position point of the edge sintering zone is obtained, and the movable blowing device is moved to the gas blowing area corresponding to the highest position point of the raw material interval to perform gas-assisted blowing.

9. A sintering control system based on gas injection assisted sintering, characterized in that: It comprises a sintering machine, a sintering trolley, an imaging acquisition device and a gas injection device, wherein the imaging acquisition device is arranged on the outer side of the sintering machine tail wheel of the sintering machine, and the imaging acquisition device is used to acquire the tail image of the current sintering trolley; It also includes a processing device for executing the steps of the method for adjusting the end point of gas injection full-section sintering based on the tail image as described in any one of claims 1 to 8.

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