Control system and control method for tertiary dust removal system of converter steelmaking

Abstract

The present invention discloses a control system applied to a tertiary dust removal system for converter steelmaking, comprising: a particle concentration detection device arranged at the outer periphery of the top suction in front of the furnace and the upper gas collection hood of the oxygen gun; a flue gas imaging acquisition device arranged on the secondary dust removal port in front of the converter, the flue gas imaging acquisition device is used to detect the flue gas dispersion during the converter blowing process; a micro-pressure detection device arranged at the converter furnace mouth position, the micro-pressure detection device is used to detect the micro-pressure value of the converter furnace mouth; a carbon monoxide concentration detection device arranged at the end of the converter smoke hood position, the carbon monoxide concentration detection device is used to detect the carbon monoxide concentration, and then reversely calculate the combustion rate; and a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve, a first pressure gauge, a second pressure gauge, a third pressure gauge, a fourth pressure gauge, and a control device. The present invention also discloses a control method applied to the tertiary dust removal system for converter steelmaking.

Description

Technical Field

[0001] The present invention relates to the technical field of dust removal systems, and in particular to a control system and a control method for a tertiary dust removal system for converter steelmaking. Background Art

[0002] The converter steelmaking method is one of the most critical production stages in the long process of steel production. With its high production load, it bears most of the country's steel production capacity. Under the current ultra-low emission background, converter plants are generally equipped with primary dust removal devices, secondary dust removal devices, and tertiary dust removal devices to form a tertiary dust removal system. As we all know, the primary dust removal of the converter is gas dust removal, which is mainly used to treat the flue gas generated during the converter blowing process. The secondary dust removal of the converter is auxiliary dust removal, which is mainly to solve the dust removal stage when the primary dust removal of the converter cannot meet the process requirements, such as the iron addition process stage. The tertiary dust removal of the converter is environmental dust removal, which mainly solves the dust and unorganized emissions generated by the converter plant environment. In the converter production process, the three dust removal devices each play their own role and cannot be controlled jointly. In addition, due to the instability of conditions such as blowing and raw materials during the converter production process, it is impossible to predict the smoke generation from the converter in advance. Therefore, in order to ensure the dust removal effect, the primary dust removal device, the secondary dust removal device, and the tertiary dust removal device are all in high-speed operation, which cannot effectively save energy and does not meet environmental protection requirements. Moreover, the service life of the secondary dust removal device and the tertiary dust removal device will be shortened, and the maintenance frequency needs to be increased. Summary of the invention

[0003] The purpose of the present invention is to provide a control system and a control method for a tertiary dust removal system for converter steelmaking in view of the above-mentioned deficiencies and defects of the prior art, so as to solve the above-mentioned problems.

[0004] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0005] The control system used in the tertiary dust removal system of converter steelmaking includes:

[0006] A particle concentration detection device is provided at the top suction in front of the furnace and at the periphery of the gas collecting hood on the upper part of the oxygen lance;

[0007] A flue gas imaging acquisition device is arranged on the secondary dust removal port in front of the converter furnace, and the flue gas imaging acquisition device is used to detect the flue gas emission during the converter blowing process;

[0008] A micro-pressure detection device is arranged at the converter furnace mouth, and is used to detect the micro-pressure value of the converter furnace mouth;

[0009] A carbon monoxide concentration detection device is arranged at the position of the smoke hood at the end of the converter, and the carbon monoxide concentration detection device is used to detect the carbon monoxide concentration and then reversely calculate the combustion rate;

[0010] A first regulating valve and a first pressure gauge arranged before the converter secondary dust removal furnace;

[0011] A second regulating valve and a second pressure gauge are arranged after the converter secondary dust removal furnace;

[0012] The third regulating valve is installed in the workshop in front of the converter tertiary dust removal furnace;

[0013] A fourth regulating valve disposed on the upper portion of the converter oxygen lance;

[0014] A third pressure gauge and a fourth pressure gauge are respectively arranged at the inlet of the secondary dust collector and the inlet of the tertiary dust collector;

[0015] A control device connected to the smoke imaging acquisition device, the micro-pressure detection device, the carbon monoxide concentration detection device, the first regulating valve, the first pressure gauge, the second regulating valve, the second pressure gauge, the third regulating valve, the fourth regulating valve, the third pressure gauge, and the fourth pressure gauge.

[0016] In a preferred embodiment of the present invention, the first regulating valve, the second regulating valve, the third regulating valve and the fourth regulating valve include pneumatic regulating valves.

[0017] In a preferred embodiment of the present invention, the smoke imaging acquisition device includes an infrared imager.

[0018] In a preferred embodiment of the present invention, the carbon monoxide concentration detection device includes a carbon monoxide concentration infrared detector.

[0019] In a preferred embodiment of the present invention, the particle concentration detection device includes a particle concentration detector.

[0020] A control method for a tertiary dust removal system for converter steelmaking, using a control system for a tertiary dust removal system for converter steelmaking as described in any of the above technical solutions, includes the following methods:

[0021] When the flue gas imaging device detects flue gas, it means that the secondary dust removal fails. At this time, the third regulating valve is opened, and the speed of the converter's tertiary dust removal fan is immediately increased to solve the problem of insufficient secondary dust removal capacity or flue gas overflow;

[0022] When the detection value of the micro-pressure detection device exceeds the set micro-pressure value P1, the converter primary dust removal speed is increased by N1 revolutions, and the converter secondary dust removal fan speed is temporarily increased by R1 revolutions until the micro-pressure difference is less than P1, and then the delay T1 is restored to the original speed;

[0023] The carbon monoxide concentration is detected by the carbon monoxide concentration detection device, and then the combustion rate is calculated. When the combustion rate reaches the set value Q1, the secondary dust removal fan temporarily increases the speed by R2 until the combustion rate is lower than Q2, and then it is delayed by T2 to return to the original speed;

[0024] The gas hood pressure needs to be set to be less than 500Pa. When the gas hood pressure is greater than -500Pa, the default gas collection negative pressure is insufficient, and the opening of the first regulating valve increases. When the difference is greater than 100Pa, the opening changes by 2% every 10s up or down until the deviation is lower than 100P; The gas hood pressure needs to be set to be less than 500Pa. When the gas hood pressure is greater than -500Pa, the default gas collection negative pressure is insufficient, and the opening of the second regulating valve increases. When the difference is greater than 100Pa, the opening changes by 2% every 10s up or down until the deviation is lower than 100P; The deviation between the opened first regulating valve and the second regulating valve is set to not exceed 30Pa. When the deviation exceeds 100Pa, the regulating valve with a negative pressure close to 500Pa is used as the benchmark, and the other regulating valve is automatically adjusted. The adjustment principle is that when the difference exceeds 100Pa, the opening changes by 2% every 10s up or down until the deviation is lower than 100Pa;

[0025] When the pressure of all regulating valves is greater than -500Pa, the total system gas collection negative pressure is assumed to be insufficient, and the fan speed is increased by R3 revolutions based on the original setting. After the converter rises, the speed is controlled in the subsequent process and will not be restored unless there is human intervention.

[0026] During the operation of a single process, if the pressure fluctuation value of the third and fourth pressure gauges is greater than 300Pa, the system alarm is triggered and the corresponding fan speed is increased by R4 revolutions per T3 until the pressure returns to the original state. After the speed is increased, the speed will not return to the original speed state without manual intervention;

[0027] The micro-pressure detection device has the function of outputting switch signals and recording the smoke overflow time. After the switch signal is output to the PLC, it controls the switch of the third regulating valve, thereby controlling the high and low speeds of the three dust removal fans;

[0028] The particle concentration detection device, flue gas imaging acquisition device, and micro-pressure detection device have self-learning and early warning functions. They record abnormal parameters and the time when the abnormality occurs. Since the converter is a periodic production equipment, an early warning will be issued at the same time stage in the next cycle.

[0029] In a preferred embodiment of the present invention, the carbon monoxide concentration is detected by a carbon monoxide concentration detection device, and then the combustion rate is inversely calculated. The method for inversely calculating the combustion rate is gas concentration = (1-combustion rate)*86%*carbon monoxide volume ratio.

[0030] In a preferred embodiment of the present invention, P1=50, N1=50, R1=60, T1=30s.

[0031] In a preferred embodiment of the present invention, Q1=25%, R2=100, Q2=20%, and T2=30s.

[0032] In a preferred embodiment of the present invention, R3=50, T3=30s, and T4=50.

[0033] Due to the adoption of the above technical solution, the present invention has carried out intelligent control on the previous converter dust removal system, interlocked the detection equipment and the dust removal process, and unified the control of the primary, secondary and tertiary converters. When an abnormality occurs in the primary converter, the secondary converter responds promptly. When the secondary converter capacity is insufficient, the tertiary converter dust removal is handled in time. Therefore, in the non-smoking process, the converter tertiary dust removal fan can be in a low-speed operation state for a long time, and speed up in an emergency state. The converter secondary dust removal does not need to run at a high-speed stage for a long time, and can be operated in stages, which effectively saves energy. The power saving rate of the tertiary dust removal fan can reach more than 50%, and the power saving rate of the secondary dust removal fan can reach more than 35%, and reduce 90% of the smoke in the converter plant caused by production abnormalities. The present invention not only saves energy but also takes into account environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a structural schematic diagram of an embodiment of the present invention.

[0036] Figure 2 It is a partially enlarged schematic diagram of a part of the structure of an embodiment of the present invention.

[0037] Figure numerals: converter 1; primary dust removal device 10; secondary dust removal device 20; tertiary dust removal device 30; primary dust removal device 10; primary dust removal fan 11; primary dust collector 12; primary dust removal pipeline 13; secondary dust removal device 20; secondary dust removal fan 21; secondary dust collector 22; secondary dust removal pipeline 23; tertiary dust removal device 30; tertiary dust removal fan 31; tertiary dust collector 32; tertiary dust removal pipeline 33; particulate matter concentration detection device 100; flue gas imaging acquisition device 200; micro-pressure detection device 300; carbon monoxide concentration detection device 400; first regulating valve 510; second regulating valve 520; third regulating valve 530; fourth regulating valve 540; first pressure gauge 610; second pressure gauge 620; third pressure gauge 630; fourth pressure gauge 640. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0039] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0040] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] See also Figure 1 to Figure 2 The control system shown is applied to the tertiary dust removal system of converter steelmaking, and the tertiary dust removal system is the prior art, including a primary dust removal device 10, a secondary dust removal device 20, and a tertiary dust removal device 30. The primary dust removal device 10 includes a primary dust removal fan 11, a primary dust collector 12, and a primary dust removal pipeline 13. The secondary dust removal device 20 includes a secondary dust removal fan 21, a secondary dust collector 22, and a secondary dust removal pipeline 23. The tertiary dust removal device 30 includes a tertiary dust removal fan 31, a tertiary dust collector 32, and a tertiary dust removal pipeline 33, which will not be described in detail here.

[0042] The control system applied to the tertiary dust removal system of converter steelmaking includes a particle concentration detection device 100, a flue gas imaging acquisition device 200, a micropressure detection device 300, a carbon monoxide concentration detection device 400, a first regulating valve 510, a second regulating valve 520, a third regulating valve 530, a fourth regulating valve 540, a first pressure gauge 610, a second pressure gauge 620, a third pressure gauge 630, a fourth pressure gauge 640 and a control device connected to the above components, the control device is used to change the opening and closing conditions of the first regulating valve 510, the second regulating valve 520, the third regulating valve 530, and the fourth regulating valve 540 according to the working conditions of each component and control the working conditions of each dust removal device.

[0043] The particle concentration detection device 100 is arranged at the outer periphery of the top suction and oxygen lance gas collecting hood in front of the converter 1. The particle concentration detection device 100 in this embodiment includes a particle concentration detector, which is a prior art, and has a detection probe and a sampling tube for detecting the concentration of particles coming out of the top of the converter 10.

[0044] The flue gas imaging acquisition device 200 is arranged on the secondary dust removal port in front of the converter 1, and the flue gas imaging acquisition device 200 is used to detect the flue gas dispersion during the converter blowing process. Preferably, the flue gas imaging acquisition device 200 in this embodiment includes an infrared imager, which is arranged 0.5m above the secondary dust removal port in front of the converter 1.

[0045] The micro-pressure detection device 300 is arranged at the furnace mouth of the converter 1, and is used to detect the micro-pressure value at the furnace mouth of the converter 1. The micro-pressure detection device 300 is a micro-pressure detector in the prior art.

[0046] The carbon monoxide concentration detection device 400 is arranged at the end smoke hood position of the converter 1. The carbon monoxide concentration detection device 400 is used to detect the carbon monoxide concentration, and then reversely calculate the combustion rate through the detected carbon monoxide concentration value. The method of reversely calculating the combustion rate is coal gas concentration = (1-combustion rate) * 86% * carbon monoxide volume ratio. For example, when the carbon monoxide concentration is detected to be 52%, the combustion rate can be calculated to be 20.04% through the formula of coal gas concentration = (1-combustion rate) * 86% * carbon monoxide volume ratio. The carbon monoxide concentration detection device 400 in this embodiment includes a carbon monoxide concentration infrared detector.

[0047] The first regulating valve 510 is arranged in front of the secondary dust removal furnace of the converter, the second regulating valve 520 is arranged behind the secondary dust removal furnace of the converter, the third regulating valve 530 is arranged in the factory building in front of the tertiary dust removal furnace of the converter, and the fourth regulating valve 540 is arranged on the upper part of the oxygen gun of the converter. The first regulating valve 510, the second regulating valve 520, the third regulating valve 530, and the fourth regulating valve 540 in this embodiment include pneumatic regulating valves.

[0048] The first pressure gauge 610 is arranged in front of the converter secondary dust removal furnace, the second pressure gauge 620 is arranged after the converter secondary dust removal furnace, the third pressure gauge 630 is arranged at the entrance of the secondary dust collector, and the fourth pressure gauge 640 is arranged at the entrance of the tertiary dust collector.

[0049] The control method applied to the tertiary dust removal system of converter steelmaking, using the above control system applied to the tertiary dust removal system of converter steelmaking, includes the following methods:

[0050] When the flue gas imaging acquisition device 200 detects flue gas, it means that the secondary dust removal fails. At this time, the third regulating valve 530 is opened, and the speed of the converter tertiary dust removal fan is immediately increased to solve the problem of insufficient secondary dust removal capacity or flue gas overflow;

[0051] When the detection value of the micro-pressure detection device 300 exceeds the set micro-pressure value P1, the converter primary dust removal speed is increased by N1 revolutions, and the converter secondary dust removal fan temporarily increases the speed by R1 revolutions until the micro-pressure difference is less than P1, and then the delay T1 is restored to the original speed; in this embodiment, P1=50, N1=50, R1=60, T1=30s;

[0052] The carbon monoxide concentration is detected by the carbon monoxide concentration detection device 400, and then the combustion rate is calculated. When the combustion rate reaches the set value Q1, the secondary dust removal fan temporarily increases the speed by R2 until the combustion rate is lower than Q2, and then the delay T2 is restored to the original speed; in this embodiment, Q1 = 25%, R2 = 100, Q2 = 20%, T2 = 30s;

[0053] The gas hood pressure needs to be set to be less than 500Pa. Combined with the first regulating valve 510 and the first pressure gauge 610, when the gas hood pressure is greater than -500Pa, the default gas collection negative pressure is insufficient, and the opening of the first regulating valve 510 increases. When the difference is greater than 100Pa, the opening changes by 2% up or down every 10s until the deviation is less than 100P; the gas hood pressure needs to be set to be less than 500Pa. Combined with the second regulating valve 520 and the second pressure gauge 620, when the gas hood pressure is greater than -500Pa, the default gas collection negative pressure is insufficient , the opening of the second regulating valve 520 increases. When the difference is greater than 100Pa, the opening changes by 2% upward or downward every 10s until the deviation is lower than 100P; the deviation between the opened first regulating valve 510 and the second regulating valve 520 is set to be no more than 30Pa. When the deviation exceeds 100Pa, the regulating valve with a negative pressure close to 500Pa is used as a reference, and the other regulating valve is automatically adjusted. The adjustment principle is that when the difference exceeds 100Pa, the opening changes by 2% upward or downward every 10s until the deviation is lower than 100Pa;

[0054] When the pressure of all regulating valves is greater than -500Pa, the default total system gas collection negative pressure is insufficient, and the fan speed is increased by R3 on the basis of the original setting. After the converter rises, the speed is controlled in the subsequent process, and the speed does not resume unless human intervention occurs. In this embodiment, R3 = 50;

[0055] During the operation of a single process, if the pressure fluctuation value of the third pressure gauge 630 and the fourth pressure gauge 640 is greater than 300Pa, a system alarm is triggered and the corresponding fan speed is increased by R4 revolutions every T3 until the pressure returns to its original state. After the speed is increased, the speed will not return to the original speed state without manual intervention; in this embodiment, T3=30s, T4=50.

[0056] The micro-pressure detection device 300 has the function of outputting a switch signal and recording the smoke overflow time. After the switch signal is output to the PLC, it controls the switch of the third regulating valve 630, thereby controlling the high and low speeds of the three dust removal fans;

[0057] The particle concentration detection device 100, the flue gas imaging acquisition device 200, and the micro-pressure detection device 300 have self-learning and early warning functions. According to the abnormal conditions of the recorded parameters, the time of the abnormality is recorded. Since the converter is a periodic production equipment, an early warning is issued at the same time stage of the next cycle.

[0058] The present invention has carried out intelligent control on the previous converter dust removal system, interlocked the detection equipment and the dust removal process, and unified the control of the primary, secondary and tertiary converters. When an abnormality occurs in the primary converter, the secondary converter responds promptly. When the secondary converter capacity is insufficient, the tertiary converter dust removal is handled in time. Therefore, in the non-smoking process, the converter tertiary dust removal fan can be in a low-speed operation state for a long time, and speed up in an emergency state. The converter secondary dust removal does not need to run at a high-speed stage for a long time, and can be operated in stages, which effectively saves energy. The power saving rate of the tertiary dust removal fan can reach more than 50%, and the power saving rate of the secondary dust removal fan can reach more than 35%, and reduce 90% of the smoke in the converter plant caused by production abnormalities. The present invention not only saves energy but also meets environmental protection requirements.

[0059] The following describes practical application examples of the present invention.

[0060] The 3# converter of Liuzhou Iron and Steel Converter Plant was put into operation after the furnace operation. Figure 1 The equipment is installed as shown, and the operating control parameters are as follows:

[0061] Basic settings:

[0062] The speed of the converter primary dust removal fan is controlled in stages (as shown in Table 1):

[0063] Table 1

[0064]

[0065]

[0066] Converter secondary dust removal fan speed and valve control (as shown in Table 2):

[0067] Table 2

[0068]

[0069] Table 2-1

[0070]

[0071]

[0072] Converter three-stage dust removal fan speed and valve control (as shown in Table 3):

[0073] Table 3

[0074]

[0075]

[0076] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0077] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0078] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0079] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. The control system used in the tertiary dust removal system of converter steelmaking is characterized by: include: A particle concentration detection device is provided at the top suction in front of the furnace and at the periphery of the gas collecting hood on the upper part of the oxygen lance; A flue gas imaging acquisition device is arranged on the secondary dust removal port in front of the converter furnace, and the flue gas imaging acquisition device is used to detect the flue gas emission during the converter blowing process; A micro-pressure detection device is arranged at the converter furnace mouth, and is used to detect the micro-pressure value of the converter furnace mouth; A carbon monoxide concentration detection device is arranged at the position of the smoke hood at the end of the converter, and the carbon monoxide concentration detection device is used to detect the carbon monoxide concentration and then reversely calculate the combustion rate; A first regulating valve and a first pressure gauge are arranged before the converter secondary dust removal furnace; A second regulating valve and a second pressure gauge are arranged after the converter secondary dust removal furnace; The third regulating valve is installed in the workshop in front of the converter tertiary dust removal furnace; A fourth regulating valve disposed on the upper portion of the converter oxygen lance; A third pressure gauge and a fourth pressure gauge are respectively arranged at the inlet of the secondary dust collector and the inlet of the tertiary dust collector; A control device connected to the smoke imaging acquisition device, the micro-pressure detection device, the carbon monoxide concentration detection device, the first regulating valve, the first pressure gauge, the second regulating valve, the second pressure gauge, the third regulating valve, the fourth regulating valve, the third pressure gauge, and the fourth pressure gauge.

2. The control system for the tertiary dust removal system for converter steelmaking according to claim 1 is characterized in that: The first regulating valve, the second regulating valve, the third regulating valve and the fourth regulating valve include pneumatic regulating valves.

3. The control system for the tertiary dust removal system for converter steelmaking according to claim 1 is characterized in that: The smoke imaging acquisition device comprises an infrared imager.

4. The control system for the tertiary dust removal system for converter steelmaking according to claim 1 is characterized in that: The carbon monoxide concentration detection device comprises a carbon monoxide concentration infrared detector.

5. The control system for the tertiary dust removal system for converter steelmaking according to claim 1 is characterized in that: The particle concentration detection device includes a particle concentration detector.

6. A control method for a tertiary dust removal system for converter steelmaking, using the control system for a tertiary dust removal system for converter steelmaking as claimed in any one of claims 1 to 5, characterized in that: The following methods are included: When the flue gas imaging device detects flue gas, it means that the secondary dust removal fails. At this time, the third regulating valve is opened, and the speed of the converter's tertiary dust removal fan is immediately increased to solve the problem of insufficient secondary dust removal capacity or flue gas overflow; When the detection value of the micro-pressure detection device exceeds the set micro-pressure value P1, the converter primary dust removal speed is increased by N1 revolutions, and the converter secondary dust removal fan speed is temporarily increased by R1 revolutions until the micro-pressure difference is less than P1, and then the delay T1 is restored to the original speed; The carbon monoxide concentration is detected by the carbon monoxide concentration detection device, and then the combustion rate is calculated. When the combustion rate reaches the set value Q1, the secondary dust removal fan temporarily increases the speed by R2 until the combustion rate is lower than Q2, and then it is delayed by T2 to return to the original speed; The gas hood pressure needs to be set to be less than 500Pa. When the gas hood pressure is greater than -500Pa, the default gas collection negative pressure is insufficient, and the opening of the first regulating valve increases. When the difference is greater than 100Pa, the opening changes by 2% every 10s up or down until the deviation is lower than 100P; The gas hood pressure needs to be set to be less than 500Pa. When the gas hood pressure is greater than -500Pa, the default gas collection negative pressure is insufficient, and the opening of the second regulating valve increases. When the difference is greater than 100Pa, the opening changes by 2% every 10s up or down until the deviation is lower than 100P; The deviation between the opened first regulating valve and the second regulating valve is set to not exceed 30Pa. When the deviation exceeds 100Pa, the regulating valve with a negative pressure close to 500Pa is used as the benchmark, and the other regulating valve is automatically adjusted. The adjustment principle is that when the difference exceeds 100Pa, the opening changes by 2% every 10s up or down until the deviation is lower than 100Pa; When the pressure of all regulating valves is greater than -500Pa, the total system gas collection negative pressure is assumed to be insufficient, and the fan speed is increased by R3 revolutions based on the original setting. After the converter rises, the speed is controlled in the subsequent process and will not be restored unless there is human intervention. During the operation of a single process, if the pressure fluctuation value of the third and fourth pressure gauges is greater than 300Pa, the system alarm is triggered and the corresponding fan speed is increased by R4 revolutions per T3 until the pressure returns to the original state. After the speed is increased, the speed will not return to the original speed state without manual intervention; The micro-pressure detection device has the function of outputting switch signals and recording the smoke overflow time. After the switch signal is output to the PLC, it controls the switch of the third regulating valve, thereby controlling the high and low speeds of the three dust removal fans; The particle concentration detection device, flue gas imaging acquisition device, and micro-pressure detection device have self-learning and early warning functions. They record abnormal parameters and the time when the abnormality occurs. Since the converter is a periodic production equipment, an early warning will be issued at the same time stage in the next cycle.

7. The control method for the tertiary dust removal system of converter steelmaking according to claim 6 is characterized in that: The carbon monoxide concentration is detected by a carbon monoxide concentration detection device, and then the combustion rate is inversely calculated. The method for inversely calculating the combustion rate is gas concentration = (1-combustion rate)*86%*carbon monoxide volume ratio.

8. The control method for the tertiary dust removal system of converter steelmaking according to claim 6 is characterized in that: P1=50, N1=50, R1=60, T1=30s.

9. The control method for the tertiary dust removal system of converter steelmaking according to claim 6, characterized in that: Q1=25%, R2=100, Q2=20%, T2=30s.

10. The control method for the tertiary dust removal system of converter steelmaking according to claim 6, characterized in that: R3=50, T3=30s, T4=50.

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