Tundish baking protection system and method
阅读说明：本技术 一种中间包烘烤防护系统及方法 (Tundish baking protection system and method ) 是由 刘洋 严开勇 杨枝超 杨新泉 瞿叶 杨东明 邓攀 李华 胡念慈 于 2020-06-19 设计创作，主要内容包括：本发明公开了一种中间包烘烤防护系统,包括烘烤器、设于烘烤器下方的中间包,以及PLC控制器,所述烘烤器包括烧嘴、煤气支管和空气支管,所述烧嘴有多个,沿中间包的长度方向间隔且居中布置；所述烧嘴内设电子点火器和火焰检测器,烧嘴连通煤气支管；所述煤气支管上设置有煤气流量检测器、煤气截止阀和煤气流量调节阀；所述烧嘴与空气支管连通；所述空气支管上配置有空气流量检测器、空气截止阀和空气流量调节阀；各检测器、各阀门和电子点火器均分别与PLC控制器相连。本发明的有益效果为：所述防护系统可用于检修模式和烘烤模式这两中模式下的防护,有效保证中间包烘烤区域各工作状态下的安全受控。(The invention discloses a tundish baking protection system which comprises a roaster, a tundish and a PLC (programmable logic controller), wherein the tundish is arranged below the roaster, the roaster comprises a plurality of burners, a coal gas branch pipe and an air branch pipe, and the burners are arranged at intervals and in the middle along the length direction of the tundish; an electronic igniter and a flame detector are arranged in the burner, and the burner is communicated with the gas branch pipe; the gas branch pipe is provided with a gas flow detector, a gas stop valve and a gas flow regulating valve; the burner is communicated with the air branch pipe; an air flow detector, an air stop valve and an air flow regulating valve are arranged on the air branch pipe; and each detector, each valve and the electronic igniter are respectively connected with the PLC. The invention has the beneficial effects that: the protection system can be used for protection in two modes, namely an overhaul mode and a baking mode, and effectively ensures that the safety of the baking area of the tundish in each working state is controlled.)
1. The tundish baking protection system is characterized by comprising a roaster, a tundish and a PLC (programmable logic controller), wherein the tundish is arranged below the roaster, the roaster comprises a plurality of burners, a coal gas branch pipe and an air branch pipe, and the burners are arranged at intervals and in the middle along the length direction of the tundish; an electronic igniter and a flame detector are arranged in the burner, the burner is communicated with a gas branch pipe, and the gas branch pipe is connected with a gas supply system; the gas branch pipe is provided with a gas flow detector, a gas stop valve and a gas flow regulating valve; the burner is communicated with an air branch pipe, and the air branch pipe is connected with an air supply system; an air flow detector, an air stop valve and an air flow regulating valve are arranged on the air branch pipe; the electronic igniter, the flame detector, the coal gas stop valve, the air stop valve, the coal gas flow detector, the coal gas flow regulating valve, the air flow detector and the air flow regulating valve are respectively connected with the PLC; and the PLC receives the detection information sent by each detector and controls the opening and closing of the electronic igniter and each valve.
2. The tundish baking protection system of claim 1, wherein a plurality of gas detectors connected to the PLC controller are distributed around the tundish to detect the gas content in the tundish baking area and send the gas content information to the PLC controller.
3. The tundish baking protection system of claim 2, wherein a plurality of grating sensors connected to the PLC controller are designed on the periphery of the tundish to form a closed protection light curtain, and the PLC controller determines whether a person enters the tundish baking area by whether the grating sensors are shielded.
4. A tundish baking protection system as claimed in any one of claims 1 to 3, wherein a plurality of temperature measuring guns are arranged on one side of the tundish and connected to the PLC controller for detecting the temperature of the tundish and sending the temperature information to the PLC controller.
5. A safety-based maintenance method based on the protection system of claim 4, characterized in that the method comprises the following steps:
step one, after switching to the maintenance mode, whether flame exists in the nozzle is detected by the flame detector, and the information is sent to the PLC: if the flame is detected, the PLC controls the gas stop valve and the electronic igniter to be closed until the flame is extinguished; if no flame is detected, entering the step two;
step two, the temperature measuring gun detects the temperature of the tundish and sends the temperature information to the PLC, the PLC receives the temperature information and analyzes whether the temperature information is less than 30 ℃, if the received temperature of the tundish is more than or equal to 30 ℃, the PLC controls the air supply system to be started, the tundish is cooled by the air supply system until the temperature of the tundish is less than 30 ℃, and the step three is carried out;
thirdly, the gas detector detects the gas concentration around the tundish and sends the gas concentration information to the PLC, and the PLC receives the gas concentration information and analyzes whether the gas concentration information is less than 30mg/m3If the concentration of the received coal gas is more than or equal to 30mg/m3Controlling the air supply system to continuously purge the working area of the tundishUntil the gas concentration is less than 30mg/m3Entering the step four;
step four, detecting the gas flow in each gas branch pipe by a gas flow detector, sending the gas flow information to a PLC (programmable logic controller), receiving the gas flow information by the PLC, analyzing whether the gas flow information is 0, if the received gas flow is not 0, manually confirming on site until the gas flow received by the PLC is 0, ensuring the whole working environment to be safe, and entering step five;
step five, controlling the power failure of the grating sensor by the PLC, and enabling a worker to enter a tundish baking area for maintenance operation; inputting an overhaul ending signal after the overhaul is finished, and entering a sixth step;
and step six, the PLC controls the air flow regulating valve and the air stop valve to be closed, the air supply system stops supplying air, meanwhile, the PLC controls the grating sensor to be powered on, and real-time monitoring of the personnel entering and exiting conditions of the tundish baking area is recovered.
6. A safe baking method based on the protection system of claim 4, characterized in that the method comprises the following steps:
step one, switching a working mode to a baking mode, and controlling each valve to be opened by a PLC controller to provide gas and combustion air for a burner; turning on the automatic igniter and delaying to continuously ignite the burner, and entering the step two;
step two, the flame detector detects whether the burner has flame, and sends the information to the PLC controller: if the flame is detected, entering a step three; if the flame is not detected, manually removing the fault;
thirdly, the gas detector detects the gas concentration around the tundish and sends the gas concentration information to the PLC, and the PLC receives the gas concentration information and analyzes whether the gas concentration information is less than 30mg/m3If the concentration of the received coal gas is more than or equal to 30mg/m3Manually checking the leakage points of the whole system; if the received gas concentration is less than 30mg/m3Entering the step four;
step four, if the baking end signal is not received, skipping to step two; if the baking end signal is received, entering a fifth step;
step five, the PLC controls each valve to be closed, a flame detector is used for detecting whether flame exists in the burner, and if flame exists, faults are manually checked; when the flame is not detected, entering a sixth step;
step six, detecting the gas flow in each gas branch pipe by a gas flow detector, sending the gas flow information to a PLC (programmable logic controller), analyzing whether the received gas flow is 0 or not by the PLC, and manually checking on site if the received gas flow is not 0; if the received gas flow is 0, the whole process is finished.
Technical Field
The invention relates to the technical field of tundish baking in the steel industry, in particular to a tundish baking protection system and a tundish baking protection method.
Background
The tundish roaster mainly plays a role in roasting the tundish, is an important link of the whole continuous casting production process, and is one of several key quality control points. At present, the bakie is toasted and is generally adopted artifical mode to operate, whether possess also lack the control to its baking process, maintenance condition, its main following problem that exists: the potential safety hazard exists due to manual ignition; during the baking period of the tundish, whether a person enters a baking area or not is effectively monitored and reminded; whether the system has gas leakage or not cannot be predicted; whether the content of the coal gas exceeds the standard or not and whether the equipment in the tundish area can be overhauled or not cannot be judged; the absence of detection that the various valves are installed to command closure is normal.
With the development of artificial intelligence technology and the construction of urban intelligent steel mills, how to further reduce the labor intensity of workers and ensure the life safety of the workers is very important. But at present, an effective system for ensuring the baking safety of the tundish is lacked.
Disclosure of Invention
The invention aims to provide a tundish baking protection system and a tundish baking protection method which can be used for safety protection in an overhaul mode and a baking mode aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: a tundish baking protection system comprises a roaster, a tundish and a PLC (programmable logic controller), wherein the tundish is arranged below the roaster, the roaster comprises a plurality of burners, a coal gas branch pipe and an air branch pipe, and the burners are arranged at intervals and in the middle along the length direction of the tundish; an electronic igniter and a flame detector are arranged in the burner, the burner is communicated with a gas branch pipe, and the gas branch pipe is connected with a gas supply system; the gas branch pipe is provided with a gas flow detector, a gas stop valve and a gas flow regulating valve; the burner is communicated with an air branch pipe, and the air branch pipe is connected with an air supply system; an air flow detector, an air stop valve and an air flow regulating valve are arranged on the air branch pipe; the electronic igniter, the flame detector, the coal gas stop valve, the air stop valve, the coal gas flow detector, the coal gas flow regulating valve, the air flow detector and the air flow regulating valve are respectively connected with the PLC; and the PLC receives the detection information sent by each detector and controls the opening and closing of the electronic igniter and each valve.
According to the scheme, a plurality of gas detectors connected with the PLC are distributed around the tundish and used for detecting the gas content of the tundish baking area and sending the gas content information to the PLC.
According to the scheme, a plurality of grating sensors connected with the PLC are designed on the periphery of the tundish to form a closed protective light curtain, and the PLC judges whether personnel enter the tundish baking area or not by judging whether the grating sensors are shielded.
According to the scheme, one side of the tundish is provided with a plurality of temperature measuring guns connected with the PLC, and the temperature measuring guns are used for detecting the temperature of the tundish and sending the temperature information to the PLC.
The invention also provides a safety maintenance method based on the protection system, which comprises the following steps:
step one, after switching to the maintenance mode, whether flame exists in the nozzle is detected by the flame detector, and the information is sent to the PLC: if the flame is detected, the PLC controls the gas stop valve and the electronic igniter to be closed until the flame is extinguished; if no flame is detected, entering the step two;
step two, the temperature measuring gun detects the temperature of the tundish and sends the temperature information to the PLC, the PLC receives the temperature information and analyzes whether the temperature information is less than 30 ℃, if the received temperature of the tundish is more than or equal to 30 ℃, the PLC controls the air supply system to be started, the tundish is cooled by the air supply system until the temperature of the tundish is less than 30 ℃, and the step three is carried out;
thirdly, the gas detector detects the gas concentration around the tundish and sends the gas concentration information to the PLC, and the PLC receives the gas concentration information and analyzes whether the gas concentration information is less than 30mg/m3If the concentration of the received coal gas is more than or equal to 30mg/m3Controlling the air supply system to continuously purge the tundish working area until the gas concentration is less than 30mg/m3Entering the step four;
step four, detecting the gas flow in each gas branch pipe by a gas flow detector, sending the gas flow information to a PLC (programmable logic controller), receiving the gas flow information by the PLC, analyzing whether the gas flow information is 0, if the received gas flow is not 0, manually confirming on site until the gas flow received by the PLC is 0, ensuring the whole working environment to be safe, and entering step five;
step five, controlling the power failure of the grating sensor by the PLC, and enabling a worker to enter a tundish baking area for maintenance operation; inputting an overhaul ending signal after the overhaul is finished, and entering a sixth step;
and step six, the PLC controls the air flow regulating valve and the air stop valve to be closed, the air supply system stops supplying air, meanwhile, the PLC controls the grating sensor to be powered on, and real-time monitoring of the personnel entering and exiting conditions of the tundish baking area is recovered.
The invention also provides a safe baking method based on the protection system as claimed in
step one, switching a working mode to a baking mode, and controlling each valve to be opened by a PLC controller to provide gas and combustion air for a burner; turning on the automatic igniter and delaying to continuously ignite the burner, and entering the step two;
step two, the flame detector detects whether the burner has flame, and sends the information to the PLC controller: if the flame is detected, entering a step three; if the flame is not detected, manually removing the fault;
thirdly, the gas detector detects the gas concentration around the tundish and sends the gas concentration information to the PLC, and the PLC receives the gas concentration information and analyzes whether the gas concentration information is less than 30mg/m3If the concentration of the received coal gas is more than or equal to 30mg/m3Manually checking the leakage points of the whole system; if the received gas concentration is less than 30mg/m3Entering the step four;
step four, if the baking end signal is not received, skipping to step two; if the baking end signal is received, entering a fifth step;
step five, the PLC controls each valve to be closed, a flame detector is used for detecting whether flame exists in the burner, and if flame exists, faults are manually checked; when the flame is not detected, entering a sixth step;
step six, detecting the gas flow in each gas branch pipe by a gas flow detector, sending the gas flow information to a PLC (programmable logic controller), analyzing whether the received gas flow is 0 or not by the PLC, and manually checking on site if the received gas flow is not 0; if the received gas flow is 0, the whole process is finished.
The invention has the beneficial effects that: the protection system can be used for protection in two middle modes, namely an overhaul mode and a baking mode, and effectively ensures that the safety of a tundish baking area is controlled in each working state; the automatic igniter is utilized to realize the automatic ignition function of the burner, and the hidden danger of unsafe manual ignition is solved; the flame detector is used for detecting the flame condition of the burner, so that an accurate judgment basis is provided for judging whether the automatic igniter can work normally; the gas detector can be used for detecting the gas concentration of the baking area of the tundish in real time, and the PLC judges whether the protection system has gas leakage or not and whether the protection system meets the maintenance working condition or not; the temperature measuring gun is used for monitoring the temperature of the tundish in real time, and the PLC is used for monitoring the baking condition and the temperature condition of the tundish in real time; detecting the gas flow in the pipe by using each flow valve, judging whether gas exists in the pipeline by using a PLC (programmable logic controller), and controlling the working state of a gas stop valve; a rectangular closed protective light curtain is established by utilizing the grating sensor, whether a person enters a baking area is judged by judging whether a signal is shielded, and the safety problem caused by the fact that the person enters the baking area by mistake is solved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a flowchart of the maintenance mode of the present embodiment.
FIG. 3 is a flowchart illustrating a baking mode according to the present embodiment.
Wherein: 1. a grating sensor; 2. a tundish; 3. a gas detector; 4. burning a nozzle; 5. an electronic igniter; 6. a flame detector; 7. a gas branch pipe; 8. an air branch pipe; 9. a gas flow regulating valve; 10. an air flow regulating valve; 11. a gas flow detector; 12. an air flow detector; 13. a temperature measuring gun; 14. air branch pipes; 15. dividing the coal gas into pipes; 16. an air manifold; 17. an air supply system; 18. a gas supply system; 19. a gas main pipe; 20. an air shutoff valve; 21. a gas stop valve.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
The tundish baking protection system shown in fig. 1 comprises a baking device, a tundish 2 arranged below the baking device and a PLC (programmable logic controller), wherein the baking device comprises a plurality of
Preferably, a plurality of
Preferably, a plurality of
Preferably, one side of the tundish 2 is provided with a plurality of
In the invention, the
The tundish 2 baking protection system of the invention is established with two working modes, namely a maintenance mode and a baking mode, according to the working requirements; the overhaul mode is used for judging whether the baking area of the tundish 2 meets overhaul conditions or not, and carrying out automatic treatment when the conditions are not met so that the baking area meets overhaul operation conditions; the baking mode is used for monitoring all key links and safety-affecting factors in the baking process of the tundish 2 in real time, automatically judging and reminding different fault problems, and ensuring the baking safety of the tundish 2.
As shown in fig. 2, a safety maintenance method based on the protection system specifically includes the following steps:
step one, after the user switches the working mode to the maintenance mode, the flame detector 6 detects whether the
step two, the
step three, the
step four, the
step five, the PLC controller controls the
and step six, the PLC controls the air flow regulating valve 10 and the
As shown in fig. 3, a safe baking method based on the protection system includes the following steps:
step one, when a user switches a working mode to a baking mode, a PLC controller controls each valve to be opened to provide gas and combustion air for a
step two, the flame detector 6 detects whether the
step three, the
step four, when the baking end signal is not received, automatically jumping to the step two; entering a fifth step after receiving a baking end signal; in the actual production process, each continuous casting machine has two tundishes in total, if the continuous casting machines are ready to start casting, one tundish is baked, the other tundish is in an idle state, when the continuous casting machines are ready to start casting on site, a ready-to-cast signal lamp is on, meanwhile, a PLC controller transmits a baking end signal to a baking position tundish, and the baking position tundish stops baking; if the continuous casting machine is in the continuous casting process, one tundish is in a casting position, the other tundish is in a baking state, when the ladle changing operation is carried out on site, a ladle changing casting signal lamp is on, the tundish in the casting position is opened, meanwhile, a baking end signal is transmitted to the tundish in the baking position by the PLC, and the tundish in the baking position stops baking;
step five, the PLC controller controls each valve to be closed, after time delay of 10s, the flame detector 6 is used for detecting whether flame exists in the
step six, the
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
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