Method and system for controlling sintering end point

Abstract

The present invention discloses a method and system for controlling the end point of sintering, the method comprising: obtaining the time t0 when the sintering trolley moves from the first row of burners of the sintering ignition furnace to the second to last wind box at the tail of the sintering machine; obtaining an infrared thermal imaging image of the sintering material layer when the middle part of the sintering trolley passes the second to last wind box at the tail of the sintering machine; processing the infrared thermal imaging image to obtain the distance between the midpoint of the highest temperature area fitting of the n auxiliary doors of the sintering machine corresponding to the combustion layer in the infrared thermal imaging image and the highest point of the sintering trolley railing in the infrared thermal imaging image; calculating the fitting machine speed V1 of the sintering machine; judging whether the deviation between the fitting machine speed V1 and the actual machine speed V0 of the sintering machine is within a preset deviation range, if not, controlling the sintering machine to run at the fitting machine speed V1. The present invention calculates the fitting machine speed, and compares the fitting machine speed with the actual machine speed to guide the sintering machine to adjust the machine speed, thereby accurately controlling the sintering end point at the second to last wind box at the tail of the sintering machine.

Description

Technical Field

[0001] The invention relates to the field of sintering, and in particular to a method and system for controlling a sintering endpoint. Background Art

[0002] Sintering is the first step in steel production, and the stability and efficient control of the production process are very important. The speed of the vertical sintering determines the speed of the sintering process and has a very important impact on the quality of the sintered ore.

[0003] The precise control of the sintering end position is closely related to the vertical sintering speed. The position of the second-to-last wind box at the end of the sintering machine is taken as the ideal sintering end. When the actual sintering end is ahead of the ideal sintering end, the sintered ore is over-burned during the sintering process, which will lead to heat waste and adversely affect the quality of the sintered ore. When the actual sintering end lags behind the ideal sintering end, the sintering process is raw, the sintered ore has raw materials, and the sintering process is not fully carried out, resulting in the deterioration of the physical, chemical, and metallurgical properties of the sintered ore, which will bring serious consequences to the subsequent stable and efficient production of the blast furnace. Therefore, it is particularly important to accurately and automatically control the sintering end position at the second-to-last wind box required by the process.

[0004] The existing sintering machine speed control is mainly adjusted based on manual on-site judgment of the machine tail under-burning and over-burning conditions. This method has obvious human experience judgment and cannot achieve accurate adjustment. It is also easy to cause the sintering under-burning and over-burning to worsen due to differences in judgment between different people. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a method for controlling the sintering end point, which calculates the fitting machine speed and compares the fitting machine speed with the actual machine speed to guide the sintering machine to adjust the machine speed, thereby automatically and accurately controlling the sintering end point at the second to last bellows at the tail of the sintering machine.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a method for controlling the sintering endpoint, comprising:

[0007] Get the time t0 when the sintering trolley moves from the first row of burners in the sintering ignition furnace to the second to last wind box at the end of the sintering machine;

[0008] When the middle part of the sintering trolley passes the second to last wind box at the tail of the sintering machine, an infrared thermal image of the sintering material layer is obtained;

[0009] Process the infrared thermal image to obtain the distance between the midpoint of the highest temperature area of ​​the combustion layer corresponding to the n auxiliary doors of the sintering machine in the infrared thermal image and the highest point of the sintering trolley guardrail in the infrared thermal image; wherein the n distances are L1, L2, L3...L n ;

[0010] Calculate the fitting speed V1 of the sintering machine; where V1=[M*∑(L1,L n ) / nM0+(NM)]*P / (t0*N), M is the actual height of the sintering trolley guardrail, M0 is the height of the sintering trolley guardrail in the infrared thermal imaging image, N is the actual height of the sintering material layer, and P is the distance between the first row of burners in the sintering ignition furnace and the second to last wind box at the tail of the sintering machine;

[0011] It is determined whether the deviation between the fitting speed V1 and the actual speed V0 of the sintering machine is within a preset deviation range. If not, the sintering machine is controlled to run at the fitting speed V1.

[0012] Furthermore, the damper of the last wind box at the tail of the sintering machine is in a closed state.

[0013] Further, the time t0 taken for the sintering trolley to move from the first row of burners in the sintering ignition furnace to the second to last wind box at the tail of the sintering machine is obtained, including:

[0014] When the sensor A detects that the middle of the sintering trolley reaches the first row of burners of the sintering ignition furnace, the timer is triggered to start timing;

[0015] When the sensor B detects that the middle part of the sintering trolley reaches the second to last wind box at the tail of the sintering machine, the timer is triggered to end timing, and the time counted by the timer is t0.

[0016] Furthermore, the deviation range is ±0.05 m / min.

[0017] Furthermore, the method for controlling the sintering end point also includes adjusting the material distribution height of the corresponding auxiliary door according to the distance between the midpoint of the highest temperature area of ​​the combustion layer corresponding to the n auxiliary doors of the sintering machine in the infrared thermal imaging image and the highest point of the sintering trolley guardrail in the infrared thermal imaging image.

[0018] The present invention also provides a system for controlling the sintering endpoint, comprising:

[0019] The time acquisition module is used to obtain the time t0 when the sintering trolley moves from the first row of burners in the sintering ignition furnace to the second to last wind box at the tail of the sintering machine;

[0020] Infrared thermal imaging module, used to obtain infrared thermal imaging of the sintering material layer when the middle of the sintering trolley passes the second to last wind box at the tail of the sintering machine;

[0021] A processing module is used to process the infrared thermal image to obtain the distance between the midpoint of the highest temperature area of ​​the combustion layer corresponding to the n auxiliary doors of the sintering machine in the infrared thermal image and the highest point of the sintering trolley guardrail in the infrared thermal image; wherein the n distances are L1, L2, L3...L n ;

[0022] The calculation module is used to calculate the fitting speed V1 of the sintering machine; wherein V1=[M*∑(L1,L n ) / nM0+(NM)]*P / (t0*N), M is the actual height of the sintering trolley guardrail, M0 is the height of the sintering trolley guardrail in the infrared thermal imaging image, N is the actual height of the sintering material layer, and P is the distance between the first row of burners in the sintering ignition furnace and the second to last wind box at the tail of the sintering machine;

[0023] The judgment module is used to judge whether the deviation between the fitting speed V1 and the actual speed V0 of the sintering machine is within the preset deviation range.

[0024] The control module is used for controlling the sintering machine to run at the fitting machine speed V1 when the judgment module determines that the deviation between the fitting machine speed V1 and the actual machine speed V0 of the sintering machine is not within a preset deviation range.

[0025] Furthermore, the infrared thermal imaging module is installed on a dust removal cover facing the tail of the sintering machine.

[0026] After adopting the above technical solution, the present invention has the following beneficial effects:

[0027] 1. The present invention obtains the infrared thermal imaging image of the sintering material layer when the middle part of the sintering trolley passes the second to last wind box at the tail of the sintering machine, and calculates the moving distance H of the combustion layer along the exhaust direction by fitting. ⊥ , and at the same time obtain the moving distance H of the combustion layer along the ventilation direction ⊥ The elapsed time t0 is based on the moving distance H ⊥ and time t0, calculate the vertical sintering speed V ⊥ , and then through the vertical sintering speed V ⊥The best fitting speed V1 of the sintering machine is inferred and fitted, and the fitting speed V1 is compared with the actual speed V0. When the deviation between the fitting speed V1 and the actual speed V0 of the sintering machine exceeds the preset deviation range, the sintering machine is controlled to run at the fitting speed V1. The present invention guides the sintering machine to adjust the speed through the vertical sintering speed, and then automatically and accurately controls the sintering end point at the second to last wind box at the tail of the sintering machine. The present invention stably controls the sintering end point through the vertical sintering speed. The whole control process is timely and efficient, which can effectively avoid production fluctuations caused by human judgment, avoid sintering ore production and overburning in the sintering process, and affect the quality of sintered ore, and provide strong support for sintering homogeneity, high efficiency, energy-saving production and automated sintering.

[0028] 2. The present invention fully considers the characteristics of sintering combustion heterogeneity, divides the combustion layer of the tail section of the sintering machine into n sections according to the number of auxiliary doors for material distribution, and determines the moving height of each area of ​​the combustion layer based on the highest temperature of the combustion layer corresponding to the n auxiliary doors for material distribution in the infrared thermal imaging image of the tail section, so that the fitted moving distance H ⊥ And the calculated vertical sintering speed V ⊥ It has better representation and is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A flow chart of the method for controlling the sintering endpoint of the present invention;

[0030] Figure 2 It is a front view of the sintering machine of the present invention;

[0031] Figure 3 A top view of the sintering machine of the present invention;

[0032] Figure 4 It is a moving trajectory diagram of the combustion layer in the sintering material layer of the present invention;

[0033] Figure 5 It is the infrared thermal imaging image of the present invention;

[0034] Figure 6 It is a position diagram of the midpoint of the highest temperature area of ​​the combustion layer corresponding to the n auxiliary doors of the sintering machine of the present invention;

[0035] Figure 7 It is a principle block diagram of the system for controlling the sintering endpoint of the present invention. DETAILED DESCRIPTION

[0036] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0037] like Figure 1 A method for controlling the sintering endpoint is shown, comprising:

[0038] Step S1: obtaining the time t0 when the sintering trolley 1 moves from the first row of burners 3 of the sintering ignition furnace 2 to the second to last wind box 4 at the end of the sintering machine;

[0039] Step S2: acquiring an infrared thermal image of the sintering material layer 11 when the middle of the sintering trolley 1 passes the second to last wind box 4 at the tail of the sintering machine;

[0040] Step S3: Process the infrared thermal image to obtain the distance between the midpoint of the highest temperature area of ​​the combustion layer 10 corresponding to the n auxiliary doors of the sintering machine in the infrared thermal image and the highest point of the railing of the sintering trolley 1 in the infrared thermal image; wherein the n distances are L1, L2, L3, ..., L n ;

[0041] Step S3: Calculate the fitting speed V1 of the sintering machine; where V1 = [M*∑(L1,L n ) / nM0+(NM)]*P / (t0*N), M is the actual height of the guardrail of the sintering trolley 1, M0 is the height of the guardrail of the sintering trolley 1 in the infrared thermal imaging image, N is the actual height of the sintering material layer 11, and P is the distance between the first row of burners 3 of the sintering ignition furnace 2 and the second to last wind box 4 at the tail of the sintering machine;

[0042] Step S5: determining whether the deviation between the fitting machine speed V1 and the actual machine speed V0 of the sintering machine is within a preset deviation range, and if not, controlling the sintering machine to run at the fitting machine speed V1.

[0043] Specifically, in this embodiment, when the middle of the sintering trolley 1 passes the penultimate wind box 4 at the tail of the sintering machine, an infrared thermal image of the sintering material layer 11 is obtained, and the thermal image is analyzed and processed to calculate the moving distance H of the combustion layer 10 along the exhaust direction. ⊥ , and at the same time obtain the moving distance H of the combustion layer 10 along the exhaust direction ⊥ The elapsed time t0 is based on the moving distance H ⊥ and time t0, calculate the vertical sintering speed V ⊥ , and then through the vertical sintering speed V ⊥The best fitting speed V1 of the sintering machine is inferred and fitted, and the fitting speed V1 is compared with the actual speed V0. When the deviation between the fitting speed V1 and the actual speed V0 of the sintering machine exceeds the preset deviation range, the sintering machine is controlled to run at the fitting speed V1. The present invention guides the sintering machine to adjust the speed through the vertical sintering speed, and then automatically and accurately controls the sintering end point at the second to last bellows 4 at the tail of the sintering machine. The present invention stably controls the sintering end point through the vertical sintering speed. The whole control process is timely and efficient, which can effectively avoid production fluctuations caused by human judgment, avoid sintering ore production and overburning in the sintering process, and affect the quality of sintered ore, and provide strong support for sintering homogeneity, high efficiency, energy-saving production and automated sintering.

[0044] Among them, ∑(L1,L n ) / nM0, the distances L1, L2, L3, ... L between the midpoint of the highest temperature area of ​​the combustion layer 10 corresponding to each auxiliary door in the infrared thermal imaging image and the highest point of the guardrail of the sintering trolley 1 in the infrared thermal imaging image are calculated. n The average proportion β of the height of the trolley railing M0 in the infrared thermal imaging image is taken into full consideration in this embodiment. The combustion layer 10 of the tail section of the sintering machine is divided into n sections according to the number of auxiliary doors for material distribution. The moving height of each area of ​​the combustion layer 10 is determined based on the highest temperature of the combustion layer 10 corresponding to the n auxiliary doors for material distribution in the infrared thermal imaging image of the tail section, so that the fitted moving distance H ⊥ And the calculated vertical sintering speed V ⊥ It has better representation and is more accurate.

[0045] In this embodiment, if Figure 2 , 3 As shown in FIG. 4 , the infrared thermal imaging module 7 for obtaining the infrared thermal imaging image is installed on the dust removal cover 9 facing the tail of the sintering machine. The infrared thermal imaging module 7 is located behind the last bellows 4 at the tail of the sintering machine. Figure 2 As shown, the air door of the last wind box 4 at the end of the sintering machine is in a closed state.

[0046] The damper of the last bellows 4 is in a closed state. On the one hand, when the sintering end point is delayed, if the damper of the last bellows 4 is opened, the combustion layer 10 at the last bellows 4 will continue to move downward under the action of exhaust, but the downward distance cannot be measured; on the other hand, the influence and interference of the penultimate bellows 4 at the tail of the sintering machine on the imaging of the infrared imaging module 7 can be eliminated to ensure the accuracy of the infrared thermal imaging image obtained when the middle part of the sintering trolley 1 passes the penultimate bellows 4 at the tail of the sintering machine.

[0047] In this embodiment, the time t0 taken for the sintering trolley 1 to move from the first row of burners 3 of the sintering ignition furnace 2 to the second to last wind box 4 at the tail of the sintering machine is obtained, including:

[0048] When the sensor A5 detects that the middle of the sintering trolley 1 reaches the first row of burners 3 of the sintering ignition furnace 2, the timer is triggered to start timing;

[0049] When the sensor B6 detects that the middle part of the sintering trolley 1 reaches the second to last wind box 4 at the end of the sintering machine, the timer is triggered to end timing, and the time counted by the timer is t0.

[0050] Among them, the installation positions of sensor A5 and sensor B6 are as follows Figure 2 , Figure 3 As shown, sensor A5 is installed at the first row of burners 3 of the sintering ignition furnace 2, sensor B6 is installed at the penultimate wind box 4 at the tail of the sintering machine, and an induction block that can be detected by sensors A5 and B6 is installed under the baffle in the middle of the sintering trolley 1.

[0051] In this embodiment, according to actual production conditions, the deviation range is preset to ±0.05 m / min, and may also be adjusted according to actual needs.

[0052] In this embodiment, the ultimate goal is generally to control the sintering end point at the 2nd ± 0.3 last wind box 4 at the end of the sintering machine, and it can also be adjusted according to actual conditions.

[0053] Figure 4 This is a moving trajectory diagram of the combustion layer 10 in the sintering material layer of this embodiment;

[0054] Figure 5 This is the infrared thermal imaging image of this embodiment. Figure 5 In the middle, a indicates that the auxiliary gate corresponds to the combustion layer 10 area;

[0055] Figure 6 This is a position diagram of the midpoint of the highest temperature area of ​​the combustion layer corresponding to the n auxiliary doors of the sintering machine in this embodiment. Figure 6 The curve pointed to by b represents the upper edge of the combustion layer, the curve pointed to by c represents the lower edge of the combustion layer, the area pointed to by d represents the highest temperature range of the combustion layer corresponding to the auxiliary door, the circle pointed to by e represents the midpoint of the highest temperature area of ​​the combustion layer corresponding to the auxiliary door, and the area pointed to by f represents the irregular combustion layer at the tail of the sintering machine.

[0056] In this embodiment, the method for controlling the sintering end point also includes adjusting the material distribution height of the corresponding auxiliary door according to the distance between the midpoint of the highest temperature area of ​​the combustion layer 10 of the n auxiliary doors of the sintering machine in the infrared thermal imaging image and the highest point of the railing of the sintering trolley 1 in the infrared thermal imaging image. For the one with the largest distance, the corresponding auxiliary door is raised to a corresponding height, and the ultimate goal is to ensure that the midpoint position of the highest temperature area of ​​the combustion layer 10 of each auxiliary door is as close to the same horizontal line as possible along the width direction of the sintering trolley 1.

[0057] like Figure 7 As shown, a system for controlling sintering endpoint comprises:

[0058] A time acquisition module is used to acquire the time t0 when the sintering trolley 1 moves from the first row of burners 3 of the sintering ignition furnace 2 to the second to last wind box 4 at the tail of the sintering machine;

[0059] The infrared thermal imaging module 7 is used to obtain an infrared thermal imaging image of the sintering material layer 11 when the middle part of the sintering trolley 1 passes the second to last wind box 4 at the tail of the sintering machine;

[0060] The processing module 8 is used to process the infrared thermal image to obtain the distance between the midpoint of the highest temperature area of ​​the combustion layer 10 corresponding to the n auxiliary doors of the sintering machine in the infrared thermal image and the highest point of the fence of the sintering trolley 1 in the infrared thermal image; wherein the n distances are L1, L2, L3...L n ;

[0061] The calculation module is used to calculate the fitting speed V1 of the sintering machine; where V1=[M*∑L1,L n / nM0+NM]*P / t0*N, M is the actual height of the guardrail of the sintering trolley 1, M0 is the height of the guardrail of the sintering trolley 1 in the infrared thermal imaging image, N is the actual height of the sintering material layer 11, and P is the distance between the first row of burners 3 of the sintering ignition furnace 2 and the second to last wind box 4 at the tail of the sintering machine;

[0062] The judgment module is used to judge whether the deviation between the fitting speed V1 and the actual speed V0 of the sintering machine is within the preset deviation range.

[0063] The control module is used for controlling the sintering machine to run at the fitting machine speed V1 when the judgment module determines that the deviation between the fitting machine speed V1 and the actual machine speed V0 of the sintering machine is not within a preset deviation range.

[0064] The technical solutions involved in the above embodiments are described below in conjunction with optional embodiments.

[0065] Example 1

[0066] All sintering process parameters are within the normal control range, with sintering endpoint temperature of 380-420°C, mixed material moisture of 6.8-7.0%, sintering exhaust gas temperature of 120-140°C, sintering ignition temperature of 1000-1100°C, sintering negative pressure of -13--15kPa, sintered ore binary basicity of 1.90, sintered ore FeO content of 8.5%, sintered ore drum content of 78.33%, sintering machine trolley guardrail height M of 750mm, total number of bellows 4 of 23, 8 auxiliary distribution doors, and the distance from the bottom of the first row of burners 3 of sintering ignition furnace 2 to the No. 22 bellows 4 is 52 meters.

[0067] Conditions: The actual speed of the sintering machine V0 is 1.52m / min, and the height of the sintering layer N is 920mm;

[0068] Estimation of vertical sintering speed V ⊥ The sintering end position and the tail production and over-burning conditions are shown in Table 1. The corresponding sintered ore quality, strength and metallurgical performance indicators are shown in Table 2.

[0069] Example 2

[0070] All sintering process parameters are within the normal control range, with sintering endpoint temperature of 380-420°C, mixed material moisture of 6.8-7.0%, sintering exhaust gas temperature of 120-140°C, sintering ignition temperature of 1000-1100°C, sintering negative pressure of -13--15kPa, sintered ore binary basicity of 1.90, sintered ore FeO content of 8.5%, sintered ore drum content of 78.33%, sintering machine trolley guardrail height M of 750mm, total number of bellows 4 of 23, 8 auxiliary distribution doors, and the distance from the bottom of the first row of burners 3 of sintering ignition furnace 2 to the No. 22 bellows 4 is 52 meters.

[0071] Conditions: The actual speed of the sintering machine V0 is 1.62m / min, and the height of the sintering layer N is 870mm;

[0072] Estimation of vertical sintering speed V ⊥ The sintering end position and the tail production and over-burning conditions are shown in Table 1. The corresponding sintered ore quality, strength and metallurgical performance indicators are shown in Table 2.

[0073] Example 3

[0074] All sintering process parameters are within the normal control range, with sintering endpoint temperature of 380-420°C, mixed material moisture of 6.8-7.0%, sintering exhaust gas temperature of 120-140°C, sintering ignition temperature of 1000-1100°C, sintering negative pressure of -13--15kPa, sintered ore binary basicity of 1.90, sintered ore FeO content of 8.5%, sintered ore drum content of 78.33%, sintering machine trolley guardrail height M of 750mm, total number of bellows 4 of 23, 8 auxiliary distribution doors, and the distance from the bottom of the first row of burners 3 of sintering ignition furnace 2 to the No. 22 bellows 4 is 52 meters.

[0075] Conditions: The actual speed of the sintering machine V0 is 1.74m / min, and the height of the sintering layer N is 820mm;

[0076] Estimation of vertical sintering speed V ⊥ The sintering end position and the tail production and over-burning conditions are shown in Table 1. The corresponding sintered ore quality, strength and metallurgical performance indicators are shown in Table 2.

[0077] Example 4

[0078] All sintering process parameters are within the normal control range, with sintering endpoint temperature of 380-420°C, mixed material moisture of 6.8-7.0%, sintering exhaust gas temperature of 120-140°C, sintering ignition temperature of 1000-1100°C, sintering negative pressure of -13--15kPa, sintered ore binary basicity of 1.90, sintered ore FeO content of 8.5%, sintered ore drum content of 78.33%, sintering machine trolley guardrail height M of 750mm, total number of bellows 4 of 23, 8 auxiliary distribution doors, and the distance from the bottom of the first row of burners 3 of sintering ignition furnace 2 to the No. 22 bellows 4 is 52 meters.

[0079] Conditions: The actual speed V0 of the sintering machine is 1.52 m / min, and the height N of the sintering material layer is 920 mm.

[0080] Calculate the actual vertical sintering speed V ⊥ , sintering end position, machine tail and over-burning conditions are shown in Table 1, and the corresponding sintered ore quality, strength and metallurgical performance indicators are shown in Table 2.

[0081] Example 5

[0082] All sintering process parameters are within the normal control range, with sintering endpoint temperature of 380-420°C, mixed material moisture of 6.8-7.0%, sintering exhaust gas temperature of 120-140°C, sintering ignition temperature of 1000-1100°C, sintering negative pressure of -13--15kPa, sintered ore binary basicity of 1.90, sintered ore FeO content of 8.5%, sintered ore drum content of 78.33%, sintering machine trolley guardrail height M of 750mm, total number of bellows 4 of 23, 8 auxiliary distribution doors, and the distance from the bottom of the first row of burners 3 of sintering ignition furnace 2 to the No. 22 bellows 4 is 52 meters.

[0083] Conditions: The actual speed of the sintering machine V0 is 1.62m / min; the height of the sintering material layer N is 870mm;

[0084] Calculate the actual vertical sintering speed V ⊥ , sintering end position, machine tail and over-burning conditions are shown in Table 1, and the corresponding sintered ore quality, strength and metallurgical performance indicators are shown in Table 2.

[0085] Example 6

[0086] All sintering process parameters are within the normal control range, with sintering endpoint temperature of 380-420°C, mixed material moisture of 6.8-7.0%, sintering exhaust gas temperature of 120-140°C, sintering ignition temperature of 1000-1100°C, sintering negative pressure of -13--15kPa, sintered ore binary basicity of 1.90, sintered ore FeO content of 8.5%, sintered ore drum content of 78.33%, sintering machine trolley guardrail height M of 750mm, total number of bellows 4 of 23, 8 auxiliary distribution doors, and the distance from the bottom of the first row of burners 3 of sintering ignition furnace 2 to the No. 22 bellows 4 is 52 meters.

[0087] Conditions: The actual sintering machine speed V0 is 1.74m / min, the sintering layer height N is 820mm, and the actual vertical sintering speed V ⊥ , sintering end position, machine tail and over-burning conditions are shown in Table 1, and the corresponding sintered ore quality, strength and metallurgical performance indicators are shown in Table 2.

[0088] Table 1. Comparison of vertical sintering speed, sintering end position, machine speed, green or over-sintering under different embodiments

[0089]

[0090] Table 2. Comparison of sinter quality, strength and metallurgical properties under different implementations

[0091]

[0092] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling the sintering endpoint, characterized in that: include: Obtain the time t0 elapsed when the sintering trolley (1) moves from the first row of burners (3) of the sintering ignition furnace (2) to the second to last wind box (4) at the end of the sintering machine; When the middle part of the sintering trolley (1) passes the second to last wind box (4) at the end of the sintering machine, an infrared thermal imaging image of the sintering material layer (11) is obtained; The infrared thermal image is processed to obtain the distance between the midpoint of the highest temperature area of ​​the combustion layer (10) corresponding to the n auxiliary doors of the sintering machine in the infrared thermal image and the highest point of the sideboard of the sintering trolley (1) in the infrared thermal image; wherein the n distances are L1, L2, L3, ..., L n ; Calculate the fitting speed V1 of the sintering machine; where V1=[M*∑ ( L1,L n) / nM0+(NM)]*P / (t0*N), M is the actual height of the guardrail of the sintering trolley (1), M0 is the height of the guardrail of the sintering trolley (1) in the infrared thermal imaging image, N is the actual height of the sintering material layer (11), and P is the distance between the first row of burners (3) of the sintering ignition furnace (2) and the second to last wind box (4) at the end of the sintering machine; It is determined whether the deviation between the fitting machine speed V1 and the actual machine speed V0 of the sintering machine is within a preset deviation range. If not, the sintering machine is controlled to run at the fitting machine speed V1.

2. The method for controlling the sintering endpoint according to claim 1, characterized in that: The air door of the last wind box (4) at the end of the sintering machine is in a closed state.

3. The method for controlling the sintering endpoint according to claim 1, characterized in that: The method of obtaining the time t0 elapsed when the sintering trolley (1) moves from the first row of burners (3) of the sintering ignition furnace (2) to the second to last wind box (4) at the end of the sintering machine comprises: When the sensor A (5) detects that the middle of the sintering trolley (1) reaches the first row of burners (3) of the sintering ignition furnace (2), the timer is triggered to start timing; When the sensor B (6) detects that the middle part of the sintering trolley (1) reaches the second to last wind box (4) at the end of the sintering machine, the timer is triggered to end the timing, and the time counted by the timer is the t0.

4. The method for controlling the sintering endpoint according to claim 1, characterized in that: The deviation range is ±0.05m / min.

5. The method for controlling the sintering endpoint according to claim 1, characterized in that: It also includes adjusting the material distribution height of the corresponding auxiliary door according to the distance between the midpoint of the highest temperature area of ​​the combustion layer (10) corresponding to the n auxiliary doors of the sintering machine in the infrared thermal imaging image and the highest point of the guardrail of the sintering trolley (1) in the infrared thermal imaging image.

6. A system for controlling the sintering endpoint, characterized in that: include: A time acquisition module is used to acquire the time t0 elapsed when the sintering trolley (1) moves from the first row of burners (3) of the sintering ignition furnace (2) to the second to last wind box (4) at the end of the sintering machine; An infrared thermal imaging module (7) is used to obtain an infrared thermal imaging image of the sintering material layer (11) when the middle of the sintering trolley (1) passes the second to last wind box (4) at the end of the sintering machine; A processing module (8) is used to process the infrared thermal imaging image to obtain the distance between the midpoint of the highest temperature area of ​​the combustion layer (10) corresponding to the n auxiliary doors of the sintering machine in the infrared thermal imaging image and the highest point of the sideboard of the sintering trolley (1) in the infrared thermal imaging image; wherein the n distances are L1, L2, L3, ..., L n ; Calculation module, used to calculate the fitting speed V1 of the sintering machine; where V1 = [M*∑ ( L1,L n) / nM0+(NM)]*P / (t0*N), M is the actual height of the guardrail of the sintering trolley (1), M0 is the height of the guardrail of the sintering trolley (1) in the infrared thermal imaging image, N is the actual height of the sintering material layer (11), and P is the distance between the first row of burners (3) of the sintering ignition furnace (2) and the second to last wind box (4) at the end of the sintering machine; The judgment module is used to judge whether the deviation between the fitting speed V1 and the actual speed V0 of the sintering machine is within the preset deviation range. The control module is used for controlling the sintering machine to run at the fitting machine speed V1 when the judgment module determines that the deviation between the fitting machine speed V1 and the actual machine speed V0 of the sintering machine is not within a preset deviation range.

7. The system for controlling the sintering endpoint according to claim 6, characterized in that: The infrared thermal imaging module (7) is installed on a dust removal cover (9) facing the tail of the sintering machine.

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