CN113088588A - Unattended full-automatic autonomous control system and method for large-scale blast furnace injection system - Google Patents
Unattended full-automatic autonomous control system and method for large-scale blast furnace injection system Download PDFInfo
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- CN113088588A CN113088588A CN202110382477.0A CN202110382477A CN113088588A CN 113088588 A CN113088588 A CN 113088588A CN 202110382477 A CN202110382477 A CN 202110382477A CN 113088588 A CN113088588 A CN 113088588A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
Abstract
The invention discloses an unattended full-automatic autonomous control system and a method for a large-scale blast furnace injection system, wherein an automatic measurement and control system is used for monitoring the flow rate of mixed gas at the mouth of a coal injection pipeline in real time, if the flow rate of the mixed gas is lower than an allowable value, the coal injection pipeline is judged to be in a blocked state, the automatic control system adjusts and reduces the flow rate value of coal powder gas mixture at the input port of the coal injection pipeline in real time, the gas pressure at the coal injection delivery port is increased, high gas pressure is used for breaking through the coal powder blocked in the pipeline, dynamic online blockage removal is realized, and the working efficiency is improved. The invention also adds a tail gas nitrate content detection sensor, the control system monitors the nitrate content of the tail gas in real time, if the nitrate content is too high, the gas flow is circularly introduced into the denitration chamber again for denitration, and the control system opens the discharge valve to discharge the gas reaching the standard until the discharge requirement is met. The invention has a waste heat recovery structure, and has the characteristics of high automation degree, high efficiency, automatic blockage removal, no need of manual intervention and the like.
Description
Technical Field
The invention relates to a control method of a large-scale blast furnace injection system, in particular to a multifunctional unattended full-automatic autonomous control system and method for conveying and feeding pulverized coal feeding, recovering waste heat of sintered ore and detecting tail gas emission of a large-scale blast furnace injection system pulverized coal feeding.
Background
At present, hardware structure mechanical equipment such as large-scale blast furnace coal powder feeding conveying and sinter waste heat recovery and the like are developed more perfectly, the equipment integrally possessed on the whole flow is sufficient, but a control system matched with the equipment is relatively weak, equipment in certain links is even in a manual inspection control stage, automatic control is lacked, automatic control is basically realized for equipment in some links, but local automation is realized only limited to a certain process link in coal powder feeding or input links, a complete automatic control system for complete equipment is lacked, and the existing automatic system does not reach the level of unattended full-automatic autonomous control.
Disclosure of Invention
The invention aims to solve the problems in the background art and provide an unattended full-automatic autonomous control system and method for a large-scale blast furnace injection system. The automatic unattended control is carried out on all the equipment and each process link equipment, each process link equipment is managed comprehensively, and the coordination control is carried out, so that the purposes of high precision, high efficiency, high environmental protection and high recovery rate are achieved.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
full-automatic autonomous control system of large-scale blast furnace jetting system unmanned on duty, wherein: the device comprises a feeding module, a feeding control module, a pulverized coal conveying pipeline, a blowing and blockage removing control module, a blast furnace combustion chamber, a waste heat recovery module, a tail gas discharge pipeline, a nitrate discharge detection control module and a central control core unit; the feeding module is connected with a feeding port of the pulverized coal conveying pipeline and used for feeding the pulverized coal conveying pipeline; the feeding control module is arranged on the feeding module and used for controlling the feeding amount of the feeding module, the coal powder conveying pipeline comprises a discharge port and a discharge port, the discharge port of the coal powder conveying pipeline is connected with a blast furnace combustion chamber, the injection and blockage removal control module comprises an inlet pressure monitoring sensor arranged at the discharge port of the coal powder conveying pipeline, an outlet pressure monitoring sensor arranged at the discharge port of the coal powder conveying pipeline and an injection device, the injection device is used for injecting air flow to the discharge port of the coal powder conveying pipeline, so that the material at the discharge port of the coal powder conveying pipeline flows to the discharge port of the coal powder conveying pipeline, the inlet pressure monitoring sensor is used for detecting the air pressure at the discharge port of the coal powder conveying pipeline, the outlet pressure monitoring sensor is used for detecting the air pressure at the discharge port of the coal powder conveying pipeline, the blast furnace combustion chamber is used for burning and decomposing the material and discharging the generated tail gas into, the waste heat recovery module exchanges heat with the tail gas emission pipeline, heat energy is recovered, the nitride emission detection control module is used for detecting the content of the nitride in the tail gas emission pipeline and controlling the on-off of the tail gas emission pipeline, a backflow pipe is installed on the tail gas emission pipeline, one end of the backflow pipe is connected with the tail gas emission pipeline, and the other end of the backflow pipe is connected to a blast furnace combustion chamber.
In order to optimize the technical scheme, the specific measures adopted further comprise:
the waste heat recovery control module is installed on the heat recovery module, the waste heat recovery control module can detect heat data recovered by the heat recovery module, and the waste heat recovery control module is connected with the central control core unit and can send the detected heat data to the central control core unit.
The feeding control module comprises a feeding flow monitoring sensor and a feeding speed-adjustable motor controller, wherein the feeding flow monitoring sensor is used for detecting the feeding flow of the feeding module, and the feeding speed-adjustable motor controller is used for controlling the feeding flow of the feeding module.
The blowing device comprises a blowing pressure tank and a tank pressure controller, wherein high-pressure blowing gas is stored in the blowing pressure tank, and the tank pressure controller is used for controlling the blowing pressure of the blowing pressure tank.
The waste heat recovery control module comprises a heat monitoring sensor and a heat exchange medium flow controller, the heat monitoring sensor is used for detecting heat information recovered by a heat exchange medium in the waste heat recovery module, and the heat exchange medium flow controller is used for controlling the flow of the heat exchange medium in the waste heat recovery module.
The nitrate discharge detection control module comprises a nitrate monitoring sensor, a self-circulation controller and a tail gas discharge electromagnetic valve, wherein the nitrate content monitoring sensor is used for detecting the content of nitrate in tail gas in a tail gas discharge pipeline, the self-circulation controller is used for controlling the on-off between the tail gas discharge pipeline and a return pipe, and the tail gas discharge electromagnetic valve is used for controlling the on-off between the tail gas discharge pipeline and an external space.
The central control core unit comprises a main CPU core unit, an industrial real-time Ethernet module and a local liquid crystal display, wherein the industrial real-time Ethernet module and the local liquid crystal display are connected with the main CPU core unit, the main CPU core unit can receive information of a blanking flow monitoring sensor, an inlet pressure monitoring sensor, an outlet pressure monitoring sensor, a heat monitoring sensor and a nitrated compound monitoring sensor and controls the operation of a blanking speed-adjustable motor controller, a tank pressure controller, a self-circulation controller and a tail gas emission electromagnetic valve, the industrial real-time Ethernet module is used for enabling the main CPU core unit to be in wireless communication with a cloud end, and the local liquid crystal display is used for displaying the information received and sent by the main CPU core unit.
The control method of the unattended full-automatic autonomous control system of the large-scale blast furnace injection system comprises the following steps:
step a, waste heat recovery control: the central control core unit controls the blanking speed-adjustable motor controller according to a set target heat recovery value to enable the blanking amount of the feeding module to correspond to a target heat recovery value, meanwhile, the heat monitoring sensor monitors heat information recovered by the waste heat recovery module, heat accumulation calculation is locally carried out, a final calculation result value is uploaded to the main CPU core unit, the main CPU core unit controls the blanking speed-adjustable motor controller to increase the blanking amount of the feeding module if actual heat recovery data is lower than expected, otherwise, the blanking amount of the feeding module is reduced, and the actual heat recovery data is matched with the target heat recovery value;
step b, coal powder conveying pipeline blockage removing: when the pulverized coal conveying pipeline is not blocked, the pressure difference between the inlet pressure monitoring sensor and the outlet pressure monitoring sensor is in a threshold range, the central control core unit controls the feeding module to normally feed, the injection device operates at low power, when the pulverized coal conveying pipeline is blocked, the pressure difference between the inlet pressure monitoring sensor and the outlet pressure monitoring sensor is larger than the upper threshold limit, the central control core unit reduces the feeding amount of the feeding module or enables the feeding module to stop feeding, the power of the injection device is improved, the air flow in the pulverized coal conveying pipeline is improved, and when the inlet pressure monitoring sensor and the outlet pressure monitoring sensor detect that the pressure difference between the inlet and the inlet of the pulverized coal conveying pipeline is smaller than a set threshold value, the successful blockage removal is judged;
step c, monitoring the emission of the nitrified substances: a nitrated compound chemical treatment bin is arranged at the outlet of the blast furnace combustion chamber, tail gas is subjected to a chemical denitration process in the nitrated compound chemical treatment bin, the nitrated compound chemical treatment bin is connected with a tail gas discharge pipeline, a nitrated compound monitoring sensor detects the content of the nitrated compound in the gas at the tail gas discharge pipeline in real time, if the emission standard reaches the standard, the exhaust emission electromagnetic valve is opened, the self-circulation controller closes the return pipe, if the emission standard does not reach the standard, the tail gas emission electromagnetic valve is closed, the return pipe is opened by the self-circulation controller, the tail gas returns to the blast furnace combustion chamber for secondary circulation chemical treatment until the emission meets the standard after the circulation treatment, the tail gas emission can be carried out, when the emission standard can not be met after the multiple circulation reaches a certain number of times, the main CPU core unit judges that the current tail gas treatment fails and reports the failure to the control center, and operation and maintenance personnel carry out failure maintenance.
In the step b, after the blockage is successfully removed, the feeding module is controlled to maximize the blanking flow, so that the working flow lost in the blockage removing period is improved.
The invention has the characteristics of high automation degree, high efficiency, automatic blockage removal, no need of manual intervention and the like. The unattended full-automatic autonomous control system of the large-scale blast furnace injection system disclosed by the invention has the advantages that the flow rate of mixed gas at the port of the coal injection pipeline is monitored in real time by using the automatic measurement and control system, if the flow rate of the mixed gas is lower than an allowable value, the blockage state of the coal injection pipeline is judged, the flow rate value of a coal powder mixture at the input port of the coal injection pipeline is adjusted and reduced in real time by using the automatic control system, the gas pressure at the coal injection delivery port is increased, the high-pressure is utilized to break through the coal powder blocked in the pipeline, the dynamic online blockage removal is realized.
The invention also adds a tail gas nitrate content detection sensor, the control system monitors the nitrate content of the tail gas in real time, if the nitrate content is too high, the gas flow is circularly introduced into the denitration chamber again for denitration, and the control system opens the discharge valve to discharge the gas reaching the standard until the discharge requirement is met.
The device has a waste heat recovery structure, can set a target through setting parameter recovery, and the control system automatically controls the blanking speed of the sinter ore to recover the waste heat according to the daily waste heat recovery target and can monitor the heat accumulated value in real time.
Drawings
FIG. 1 is a schematic block diagram of an automated control system according to the present invention;
fig. 2 is a flow chart of the internal automatic control provided by the present invention.
The labels in the figures are: the device comprises a feeding module 1, a feeding control module 2, a pulverized coal conveying pipeline 3, a blowing and blocking removal control module 4, a blast furnace combustion chamber 5, a waste heat recovery module 6, a waste heat recovery control module 7, a tail gas discharge pipeline 8, a nitrated substance discharge detection control module 9 and a central control core unit 10.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, there is shown a schematic diagram of a control system architecture provided by the present invention in one embodiment: the present invention mainly comprises the following steps: the device comprises a feeding module 1, a feeding control module 2, a coal powder conveying pipeline 3, a blowing and blocking removal control module 4, a blast furnace combustion chamber 5, a waste heat recovery module 6, a tail gas discharge pipeline 8, a nitride discharge detection control module 9 and a central control core unit 10. The feeding control module 2 can monitor the current feeding flow, and the current feeding flow is reflected as the feeding opening size, the feeding speed, the opening size and the speed, which are changed by the feeding control module 2 according to a control command issued by the central control core unit 10, and the central control core unit 10 can dynamically change in real time according to the daily feeding target flow set inside and whether the coal conveying pipeline is blocked currently. The feeding control module 2 controls the feeding flow by controlling the operation of the feeding motor. The blowing and blockage removal control module 4 comprises a conveying controller, an inlet pressure monitoring sensor, an outlet pressure monitoring sensor and an electromagnetic tank pressure regulating valve, wherein the conveying controller is used for controlling an input signal. The MF control unit comprises a module controller, an inlet pressure monitoring device, an outlet pressure monitoring device and an electromagnetic tank pressure control valve. The module controller monitors the inlet and outlet pressures in real time and outputs a status signal to the control center when the pressure difference between the inlet and outlet pressures exceeds a threshold. On the other hand, the threshold value data is transmitted to the local controller execution module via the central control core unit 10. The local control module controls the tank pressure electromagnetic valve so as to adjust the pressure value of the coal conveying in the pipeline. The pressure value is dynamically issued by the central processing unit module according to the operation information of the current equipment process nodes, so that the central processing unit can control the local tank pressure value in real time. The sintering material waste heat recovery module 6 is connected with a recovery heat sensor, and a feed opening motor controller is connected to the central control core unit 10 through a real-time Ethernet bus.
The local control module controls the heat recovery value according to the day or month target sent by the central control core unit 10 to automatically control the motor of the feed opening, so that the opening size of the feed opening is realized, and the control of the feed speed is realized. Meanwhile, the heat value is monitored by the heat sensor, the heat accumulation calculation is locally performed, the final calculation result value is uploaded to the central control core unit 10, and the central control core unit 10 can check the currently recovered actual heat value and the operation curve of the heat value away from the target in real time. The nitrate discharge detection control module 9 comprises a local control module, a nitrate content gas detection sensor, a tail gas discharge electromagnetic valve, a self-circulation electromagnetic valve, a pneumatic circulation tank compressor controller and the like. The local control module receives the index parameters of the nitrated substance emission of the central control core unit 10, then opens the inlet electromagnetic valve to introduce the tail gas discharged by the blast furnace combustion into the nitrated substance chemical treatment bin through the inlet, the local control module opens the gas automatic circulation system to perform the chemical denitration process, and detects the content of the nitrated substance in the gas at the discharge outlet in real time, if the discharge standard reaches the standard, the tail gas discharge valve is opened, if the discharge standard does not reach the standard, the tail gas discharge valve is closed, and simultaneously the air inlet valve is closed to open the self-circulation valve to perform the secondary circulation chemical treatment, the tail gas discharge can be performed until the discharge standard is satisfied by the circulation treatment, when the multiple circulation reaches a certain number of times, the local control module still can not satisfy the discharge standard, the local control module reports the tail gas treatment fault information to the central control core unit 10, the central control core unit 10, and (5) carrying out fault maintenance by operation and maintenance personnel. The central control core unit 10 includes a local liquid crystal input panel, and can input a daily feeding index or a monthly feeding index, a daily or monthly waste heat recovery index, and a blockage removal opening pressure difference P. The central control core unit 10 can automatically issue operation parameters of each process link device through a real-time Ethernet bus according to the inside of the input parameters, all the devices are started to operate according to the issued parameters, when the central control core unit 10 receives that the pressure difference P reported by the blockage removing device exceeds a threshold value, the feeding flow rate and the flow rate can be controlled, then the tank pressure of the coal conveying pipeline is increased, the variable pressure and the air pressure can be controlled and output according to a certain output signal curve, the blockage removing function of the pipeline is achieved, when the situation that the inlet and inlet pressure difference is smaller than a set threshold value is judged to be that the blockage removing is successful, the central control core unit 10 can increase the feeding flow rate and the flow rate at the moment, and in order to make up the work efficiency lost in. Meanwhile, in order to prevent the occurrence of the blocking phenomenon, the second tank pressure output curve chart is adjusted.
Referring to fig. 2, it shows a flow chart of the internal automatic control of the control system provided by the present invention:
after the central core control unit starts to operate, the feeding system is started firstly, then the pressure difference P between the inlet and the outlet of the coal conveying pipeline is dynamically checked, whether the current P exceeds a threshold value Pz is judged, if yes, a blockage removal control strategy is started, the pressure of the injection pressure tank is increased, the feeding flow rate of the feeding control unit is reduced at the same time, and the central control core unit 10 controls the feeding unit to output normal feeding flow rate after the pipeline is successfully blocked. On the other hand, the central control core unit 10 monitors the real-time heat Q value sent by the waste heat recovery unit in real time, compares the value with the set target heat Qz, and closes the feed opening waste heat recovery valve when the threshold value is met. And a tail gas emission monitoring unit monitors the index of the nitrate content in the tail gas in real time, if the tail gas does not reach the standard, the central core control system controls the valve of the exhaust port to be closed, the internal self-circulation secondary nitrate treatment valve is opened, and the valve of the exhaust port is opened to remove the tail gas until the tail gas after the circulation treatment meets the emission standard.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (9)
1. Full-automatic autonomous control system of large-scale blast furnace jetting system unmanned on duty, characterized by: the device comprises a feeding module (1), a feeding control module (2), a coal powder conveying pipeline (3), a blowing and blocking removal control module (4), a blast furnace combustion chamber (5), a waste heat recovery module (6), a tail gas discharge pipeline (8), a nitrated substance discharge detection control module (9) and a central control core unit (10); the feeding module (1) is connected with a feeding opening of the coal powder conveying pipeline (3) and is used for feeding the coal powder conveying pipeline (3); the feeding control module (2) is arranged on the feeding module (1) and used for controlling the feeding amount of the feeding module (1), the coal powder conveying pipeline (3) comprises a feed opening and a discharge opening, the discharge opening of the coal powder conveying pipeline (3) is connected with a blast furnace combustion chamber (5), the injection and blockage removal control module (4) comprises an inlet pressure monitoring sensor arranged at the feed opening of the coal powder conveying pipeline (3), an outlet pressure monitoring sensor arranged at the discharge opening of the coal powder conveying pipeline (3) and an injection device, the injection device is used for injecting air flow to the feed opening of the coal powder conveying pipeline (3) to ensure that the material at the feed opening of the coal powder conveying pipeline (3) flows to the discharge opening of the coal powder conveying pipeline (3), the inlet pressure monitoring sensor is used for detecting the air pressure at the feed opening of the coal powder conveying pipeline (3), and the outlet pressure monitoring sensor is used for detecting the air pressure at the discharge opening of the, the blast furnace combustion chamber (5) is used for burning and decomposing materials and discharging generated tail gas into a tail gas discharge pipeline (8), the waste heat recovery module (6) and the nitrated substance discharge detection control module (9) are both arranged on the tail gas discharge pipeline (8), the waste heat recovery module (6) exchanges heat with the tail gas discharge pipeline (8) to recover heat energy, the nitrated substance discharge detection control module (9) is used for detecting the content of the nitrated substance in the tail gas discharge pipeline (8) and controlling the on-off of the tail gas discharge pipeline (8), the tail gas discharge pipeline (8) is provided with a return pipe, one end of the return pipe is connected with the tail gas discharge pipeline (8), and the other end is connected with the blast furnace combustion chamber (5), the central control core unit (10) is respectively connected with the feeding control module (2), the blowing and blocking discharge control module (4) and the nitrated substance discharge detection control module (9), the central control core unit (10) can receive signals of the inlet pressure monitoring sensor, the outlet pressure monitoring sensor and the nitride emission detection control module (9) and control the on-off of the feeding module (1) and the tail gas emission pipeline (8) and the injection power of the injection device.
2. The unattended full-automatic autonomous control system of the large-scale blast furnace injection system according to claim 1, characterized in that: the heat recovery module (6) on install waste heat recovery control module (7), waste heat recovery control module (7) can detect the heat data that heat recovery module (6) retrieved, waste heat recovery control module (7) be connected with central control core unit (10) to can send the heat data who detects to central control core unit (10).
3. The unattended full-automatic autonomous control system of the large-scale blast furnace injection system according to claim 2, characterized in that: the feeding control module (2) comprises a feeding flow monitoring sensor and a feeding speed-adjustable motor controller, the feeding flow monitoring sensor is used for detecting the feeding flow of the feeding module (1), and the feeding speed-adjustable motor controller is used for controlling the feeding flow of the feeding module (1).
4. The unattended full-automatic autonomous control system of the large-scale blast furnace injection system according to claim 3, characterized in that: the blowing device comprises a blowing pressure tank and a tank pressure controller, wherein high-pressure blowing gas is stored in the blowing pressure tank, and the tank pressure controller is used for controlling the blowing pressure of the blowing pressure tank.
5. The unattended full-automatic autonomous control system of the large-scale blast furnace injection system according to claim 4, characterized in that: the waste heat recovery control module (7) comprises a heat monitoring sensor and a heat exchange medium flow controller, the heat monitoring sensor is used for detecting heat information recovered by a heat exchange medium in the waste heat recovery module (6), and the heat exchange medium flow controller is used for controlling the flow of the heat exchange medium in the waste heat recovery module (6).
6. The unattended full-automatic autonomous control system of the large-scale blast furnace injection system according to claim 5, characterized in that: the device is characterized in that the nitrate discharge detection control module (9) comprises a nitrate monitoring sensor, a self-circulation controller and a tail gas discharge electromagnetic valve, the nitrate content monitoring sensor is used for detecting the content of the tail gas nitrate in the tail gas discharge pipeline (8), the self-circulation controller is used for controlling the on-off between the tail gas discharge pipeline (8) and a return pipe, and the tail gas discharge electromagnetic valve is used for controlling the on-off between the tail gas discharge pipeline (8) and the external space.
7. The unattended full-automatic autonomous control system of the large-scale blast furnace injection system according to claim 6, characterized in that: the central control core unit (10) include main CPU core unit, industry real-time ethernet module and local LCD all be connected with main CPU core unit, main CPU core unit can receive unloading flow monitoring sensor, entry pressure monitoring sensor, export pressure monitoring sensor, heat monitoring sensor, nitride monitoring sensor's information to the operation of the adjustable speed motor controller of control unloading, jar pressure controller, self-loopa controller and exhaust emission solenoid valve, industry real-time ethernet module be used for making main CPU core unit and high in the clouds wireless communication, local LCD be used for showing the information that main CPU core unit received and sent.
8. The control method of the unattended full-automatic autonomous control system of the large-scale blast furnace injection system according to claim 7, characterized in that: the method comprises the following steps:
step a, waste heat recovery control: the central control core unit (10) controls the blanking speed-adjustable motor controller according to a set target heat recovery value, so that the blanking amount of the feeding module (1) corresponds to a target heat recovery value, meanwhile, heat information recovered by the waste heat recovery module (6) is monitored by a heat monitoring sensor, heat accumulation calculation is locally carried out, a final calculation result value is uploaded to the main CPU core unit, and the main CPU core unit controls the blanking speed-adjustable motor controller to increase the blanking amount of the feeding module (1) if actual heat recovery data is lower than expectation, otherwise, the blanking amount of the feeding module (1) is reduced, so that the actual heat recovery data is matched with the target heat recovery value;
step b, coal powder conveying pipeline (3) blockage removing step: when the pulverized coal conveying pipeline (3) is not blocked, the pressure difference between an inlet pressure monitoring sensor and an outlet pressure monitoring sensor is in a threshold range, the central control core unit (10) controls the feeding module (1) to normally feed, the injection device operates at low power, when the pulverized coal conveying pipeline (3) is blocked, the pressure difference between the inlet pressure monitoring sensor and the outlet pressure monitoring sensor is larger than the upper limit of the threshold, the central control core unit (10) reduces the feeding amount of the feeding module (1) or enables the feeding module (1) to stop feeding, the power of the injection device is improved, the airflow in the pulverized coal conveying pipeline (3) is improved, and when the inlet pressure monitoring sensor and the outlet pressure monitoring sensor detect that the pressure difference between an inlet and an inlet of the pulverized coal conveying pipeline (3) is smaller than a set threshold value, the blockage removal is determined to be successful;
step c, monitoring the emission of the nitrified substances: a nitrated compound chemical treatment bin is arranged at the outlet of the blast furnace combustion chamber (5), tail gas is subjected to a chemical denitration process in the nitrated compound chemical treatment bin, the nitrated compound chemical treatment bin is connected with a tail gas discharge pipeline (8), a nitrated compound monitoring sensor detects the content of the nitrated compound in the gas at the tail gas discharge pipeline (8) in real time, if the discharge standard reaches the standard, a tail gas discharge electromagnetic valve is opened, a return pipe is closed by a self-circulation controller, if the discharge standard does not reach the standard, the tail gas discharge electromagnetic valve is closed, the return pipe is opened by the self-circulation controller, the tail gas returns to the blast furnace combustion chamber (5) for secondary circulation chemical treatment, the tail gas discharge can be carried out until the discharge standard is met by the circulation treatment, when the circulation reaches a certain number of times, the discharge standard can not be met, a main CPU core unit judges that, and (5) carrying out fault maintenance by operation and maintenance personnel.
9. The control method of the unattended full-automatic autonomous control system of the large-scale blast furnace injection system according to claim 8, characterized in that: in the step b, after the blockage is successfully removed, the feeding module (1) is controlled to maximize the blanking flow, so that the working flow lost in the blockage removing period is improved.
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2021
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