A control system and method for a roasting system for pre-treating waste lithium batteries

Abstract

This invention discloses a control system for a roasting system in the pretreatment of waste lithium batteries, including a preheating subsystem. The preheating subsystem includes a preheater, a preheater chain conveyor, a conveyor and processing device for the chain conveyor, an exhaust fan, an oxygen content sensor, and a DCS system. The outputs of the preheater chain conveyor, the conveyor and processing device for the chain conveyor, the exhaust fan, and the oxygen content sensor are connected to the DCS system. The DCS system controls the opening and closing of the preheater and the preheater chain conveyor based on status signals from these components. The output of the DCS system is connected to a hydraulic valve at the preheater outlet, used to control the valve to open and close according to a set time. By sequentially controlling the operation of each system, the safe and efficient operation of the roasting system is ensured.

Description

Technical Field

[0001] This invention relates to the field of new energy lithium-ion battery recycling, and in particular to a control system and method for a roasting system in the pretreatment of waste lithium batteries. Background Technology

[0002] Lithium-ion recycling can reduce environmental pollution and simultaneously enable the recycling and utilization of non-renewable metal resources such as lithium. Traditional lithium battery recycling generally involves multiple stages, including crushing, dismantling, roasting, and leaching. Intermediate materials are transferred between each stage via a conveyor system to complete the entire recycling process. Roasting is the main process in lithium battery recycling, involving the roasting and reduction of dismantled and pre-treated lithium batteries to obtain the corresponding metal materials. For example, patent application number 201010262198.2 discloses a method for recovering valuable metals from waste lithium batteries, specifically: mechanically crushing discharged waste lithium batteries and calcining them at a high temperature of 350℃-400℃ to obtain materials containing cobalt, copper, and aluminum; then adding a 5%-10% sodium hydroxide solution and reacting for 2-3 hours; filtering, washing, and drying the alkaline solution to obtain materials containing cobalt and copper; adding a certain concentration of sulfuric acid and Na2S2O3 to the cobalt- and copper-containing materials, stirring to dissolve, adding an extractant to extract copper, and adding an extractant to the solution after copper extraction to extract cobalt. The method of this invention is simple, efficient, and has low recycling costs.

[0003] Therefore, roasting is a crucial component of lithium battery recycling. Roasting typically takes place in a roasting kiln, where the disassembled and preheated lithium battery materials are thoroughly roasted. The roasting system is a vital part of the recycling process; however, considering the high or even ultra-high temperatures used in roasting, any problems in the production process can lead to safety accidents. Traditional roasting system controls only consider normal operation, with less attention paid to malfunctions and safety regulations. Safety accidents can range from minor equipment damage to serious incidents. Therefore, it is essential to control the safety of the roasting system to ensure its safe and reliable operation. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a control system and method for a roasting system in the pretreatment of waste lithium batteries, thereby improving the safe operation of the roasting system by implementing safety control and start-up coordination control.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a control system for a roasting system in the pretreatment of waste lithium batteries, comprising a preheating subsystem for preheating the disassembled lithium batteries; the preheating subsystem includes a preheater, a preheater chain conveyor, a conveying and processing device for the chain conveyor, an exhaust fan, an oxygen content sensor, and a DCS system; the outputs of the preheater chain conveyor, the conveying and processing device for the chain conveyor, the exhaust fan, and the oxygen content sensor are connected to the DCS system; the DCS system controls the opening and closing of the preheater and the preheater chain conveyor based on the status signals transmitted from the preheater chain conveyor, the conveying and processing device for the chain conveyor, the exhaust fan, and the oxygen content sensor; the output of the DCS system is connected to the preheater outlet hydraulic valve for controlling the hydraulic valve to open and close according to a set time.

[0006] The output of the DCS system is connected to a field alarm bell, which is used to issue an alarm signal when the preheater equipment is turned on.

[0007] The control system also includes an air intake subsystem, which includes a tertiary air duct supply fan, a preheater outlet fan, a calcining kiln outlet cyclone separator, a calcining kiln inlet pneumatic actuator, and an air intake fan. The DCS system controls the tertiary air duct supply fan, the preheater outlet fan, the calcining kiln outlet cyclone separator, the calcining kiln inlet pneumatic actuator, and the air intake fan to start and operate according to a set logic.

[0008] The system also includes a crushing subsystem, which comprises a primary crushing bag dust collector fan, a primary crushing bag dust collector rotary feeder, a chain conveyor, a chain conveyor cooling fan, a secondary twin-shaft shredder, and a primary twin-shaft shredder. The DCS system sequentially controls the start-up of the primary crushing bag dust collector fan, the primary crushing bag dust collector rotary feeder, the chain conveyor, the chain conveyor cooling fan, the secondary twin-shaft shredder, and the primary twin-shaft shredder to achieve start-up control of the crushing system.

[0009] The DCS system controls the operation of the dust collection bags in the calcining kiln inlet silo, the rotary feeder for dust collection in the calcining kiln inlet silo, the dust collection fan in the calcining kiln inlet silo, and the No. 1 bucket elevator, respectively, and controls the start-up of the No. 1 bucket elevator based on the operating status of the dust collection bags in the calcining kiln inlet silo, the rotary feeder for dust collection in the calcining kiln inlet silo, and the dust collection fan in the calcining kiln inlet silo.

[0010] The control system also includes a preheated cooling conveying system, which includes a single-axis water-cooled spiral conveyor, a dual-axis water-cooled spiral conveyor, and a single-axis water-cooled spiral temperature sensor. The input end of the DCS system is connected to the single-axis water-cooled spiral temperature sensor, and the output end of the DCS system is connected to the single-axis water-cooled spiral conveyor, the dual-axis water-cooled spiral conveyor, and the single-axis water-cooled spiral temperature sensor, for controlling their start-up operation according to the sequential control process.

[0011] The control system also includes a hot blast stove system for providing hot air. The DCS system acquires the status information of the hot blast stove and confirms whether the hot blast stove is in a ready state. After it is in a ready state, it sequentially controls the hot blast stove inlet fuel actuator and the hot blast coupler fuel solenoid valve to realize the ignition and start-up of the hot blast stove.

[0012] The control system also includes a water-cooled control system for the output material of the calcining furnace. The water-cooled control system for the output material of the calcining furnace includes a dust collection bag for the leaching unfinished material silo, a rotary feeder for the dust collection bag for the leaching unfinished material silo, a dust collection fan for the leaching unfinished material silo, a No. 2 bucket elevator, and a water-cooled screw conveyor. The DCS system controls the dust collection bag for the leaching unfinished material silo, the rotary feeder for the dust collection bag for the leaching unfinished material silo, the dust collection fan for the leaching unfinished material silo, the No. 2 bucket elevator, and the water-cooled screw conveyor to start according to a preset sequential control mode based on the acquired start signal.

[0013] The hot blast stove high-temperature gas channel control subsystem includes a chimney inlet electric actuator, a boiler fan pneumatic actuator, and a blast stove outlet fan. The DCS system controls the chimney inlet electric actuator, boiler fan pneumatic actuator, and blast stove outlet fan to start working according to a preset mode based on the received channel start signal.

[0014] A control method for a roasting system in the pretreatment of waste lithium batteries, wherein a DCS system controls the opening and closing of the preheater and the preheater chain conveyor based on status signals from the preheater chain conveyor, the conveying and processing equipment off the chain conveyor, the exhaust fan, and the oxygen content sensor; the output end of the DCS system is connected to the hydraulic valve at the preheater outlet, which is used to control the hydraulic valve to open and close according to a set time.

[0015] The advantages of this invention are: by introducing a DCS, the start-up control of each component of the roasting system is realized through sequential and interlocking control, making the start-up and operation of the roasting system safer and more reliable, ensuring the safe and effective operation of the system, avoiding erroneous operation caused by human error, and thus avoiding safety hazards caused by erroneous operation. Attached Figure Description

[0016] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0017] Figure 1 This is a schematic diagram of the control system of the present invention;

[0018] Figure 2 This is a schematic diagram of the preheating subsystem of the present invention. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0020] The roasting system is generally used to roast lithium battery components during the lithium battery recycling process, thus providing a foundation for subsequent recycling. The general process involves disassembling the batteries into battery cells or individual cells, first preheating them through a preheater and related components to remove the liquid from the batteries, then drying and preheating the liquid. The dried lithium batteries are then crushed, sorted, and fed into a roasting furnace for roasting to obtain battery material, providing a basis for subsequent dissolution. To ensure the controllable and effective operation of each component in the roasting system, this application introduces a sequential control strategy through a DCS module, thereby achieving effective and reliable system operation. The specific scheme is as follows:

[0021] like Figure 1 , 2 As shown, a control system for a roasting system in the pretreatment of waste lithium batteries includes a preheating subsystem for preheating the disassembled lithium batteries. The preheating subsystem includes a preheater, a preheater chain conveyor, a conveyor and processing device for the chain conveyor, an exhaust fan, an oxygen content sensor, and a DCS system. The outputs of the preheater chain conveyor, the conveyor and processing device for the chain conveyor, the exhaust fan, and the oxygen content sensor are connected to the DCS system. The DCS system controls the opening and closing of the preheater and the preheater chain conveyor based on status signals from these components. The DCS system output is connected to a hydraulic valve at the preheater outlet to control the valve's opening and closing according to a set time. The DCS system output is also connected to a field alarm bell to issue an alarm signal when the preheater is turned on.

[0022] To ensure the preheating process of waste lithium batteries starts under normal conditions and minimize damage to the equipment and batteries, a sequential start-up procedure is designed in the DCS system to reduce operational steps. This sequential start-up procedure focuses on reflecting the status of other equipment and instruments related to the preheater's chain conveyor system. If other equipment or instruments are disconnected, malfunctioning, or alarming, the sequential start-up procedure cannot start normally.

[0023] First, the preheater chain conveyor equipment must be in a ready state, and the conveying and processing equipment of the chain conveyor must be turned on. At the same time, in order to ensure that the preheater is always in a negative pressure state, the exhaust fan needs to be turned on in advance. It is also necessary to ensure that the oxygen content in the preheater chamber does not exceed the preset alarm value. When the required equipment parameters for sequential control meet the operating conditions, the indicator color will turn green.

[0024] Secondly, when the equipment is started, an alarm bell will sound to alert on-site personnel to pay attention to their own safety. The hydraulic valve at the preheater outlet will be in an automatic state, opening and closing according to a predetermined time to coordinate with the battery discharge.

[0025] Finally, the preheater chain conveyor is started;

[0026] Similarly, the device stopping sequence will be the reverse of the starting sequence.

[0027] In reality, the preheater is associated with various transport structures and a hot air input system. Preheating is controlled via hot air, and the transport mechanisms are used for feeding and discharging. To standardize operating procedures and reduce operational errors during the preheating process of waste lithium batteries, a sequential start-up process was designed into the DCS system.

[0028] First, the lithium battery feeding equipment must be in a ready state, requiring the preheater chain conveyor, preheater outlet fan, No. 1 intake fan, and No. 2 intake fan to be in operation; the preheater inlet pneumatic valve to be in the open state, the preheater inlet electric actuator to be in the non-closed state, and the No. 1, No. 2, and No. 3 preheater inlet gate valves to be in automatic mode; the preheater pusher trolley to be in the open limit position and adjusted to automatic mode; the oxygen content in the preheater chamber to not exceed the preset alarm value; and the preheater to have a feed inlet, a discharge outlet, and a gas inlet.

[0029] Secondly, after manually pressing the open button on site, open the inlet gate valve of preheater #1 and the inlet gate valve of preheater #3 to put in the waste lithium battery. After ensuring that the battery has been fully put in, manually press the close button on site to close the inlet gate valve of preheater #1 and the inlet gate valve of preheater #3.

[0030] Next, after confirming that the inlet gate valves of preheater #1 and #3 are completely closed, the inlet gate valve of preheater #2 (1SG03) automatically opens, and the preheater pusher trolley automatically completes one forward and backward push operation. After returning to the open limit state, the inlet gate valve of preheater #2 automatically closes, completing one lithium battery feeding operation.

[0031] Before preheating, waste lithium batteries require the introduction of high-temperature gas from the kiln tail for pretreatment and rotary kiln calcination. To standardize operating procedures and reduce operational errors, a sequential start-up process was designed within the DCS system. This process includes the tertiary air duct supply fan, preheater outlet fan, calcination kiln outlet cyclone separator, calcination kiln inlet pneumatic actuator, and intake fan. The DCS system controls these components to start and operate according to a predefined logic. To ensure the entire induced draft system can be started normally and that other related equipment remains in normal condition during startup, interlocking controls are implemented. If other equipment or instruments are disconnected, malfunctioning, or triggering an alarm, the sequential start-up process will not start, thus preventing equipment malfunctions.

[0032] First, the equipment to be started must be in a remote ready state, the pneumatic actuator at the preheater outlet must be in the open state, the electric actuator at the preheater inlet must be in the closed state, and the temperature detection device in the No. 1 air intake cyclone must not issue a high temperature alarm indication, then the conditions for starting the equipment are met.

[0033] Secondly, click the one-click start button, and the on-site alarm will sound, reminding on-site personnel that the equipment has entered the start-up process. The electric actuator of the tertiary air duct supply fan must be in the off state. The tertiary air duct supply fan will start, and then the preheater outlet fan and the calcining kiln outlet cyclone will enter the automatic mode and then start automatically.

[0034] Then the preheater outlet fan starts running, the preheater inlet pneumatic actuator enters automatic mode and starts; the cyclone separator outlet valve of the calcining kiln closes, the cyclone separator outlet of the calcining kiln enters automatic mode and then starts, and the calcining kiln inlet pneumatic actuator starts simultaneously.

[0035] Then, the electric actuator of the No. 2 intake fan of the cement plant is turned off, and the No. 2 intake fan of the cement plant enters automatic mode and is then turned on. The high-temperature bag dust collection system is turned on when the opening degree of the electric actuator at the outlet of the high-temperature bag dust collector of the cement plant is less than 5%.

[0036] Finally, turn on the No. 1 air intake fan to complete the air intake process.

[0037] After preheating, waste lithium batteries need to pass through a primary crushing system to crush the batteries after the electrolyte has evaporated, allowing for better separation of substances within the batteries. To standardize operating procedures and reduce operational errors, a sequential start-up process was designed into the DCS system. The crushing subsystem includes a primary crushing bag dust collector fan, a primary crushing bag dust collector rotary feeder, a chain conveyor, a chain conveyor cooling fan, a secondary dual-shaft shredder, and a primary dual-shaft shredder. The DCS system sequentially controls the start-up of the primary crushing bag dust collector fan, the primary crushing bag dust collector rotary feeder, the chain conveyor, the chain conveyor cooling fan, the secondary dual-shaft shredder, and the primary dual-shaft shredder to achieve start-up control of the crushing system.

[0038] In the sequential start-up process, in order to ensure that the entire crushing system can be started normally and that other related equipment is in normal condition during the primary crushing process, an interlocking control is set up so that the sequential start-up process cannot be started normally when other equipment and instruments are disconnected, faulty, or alarmed. This also avoids equipment misoperation.

[0039] First, before starting, it is necessary to confirm that the weight and temperature of the crushed raw material hopper are below the high alarm value, and the opening degree of the electric actuator of the primary crushing bag dust collector is less than 5%.

[0040] Secondly, after one-button start, the on-site alarm bell will sound, reminding on-site personnel that the equipment has entered the start-up process. The primary crushing bag dust collector, the primary crushing bag dust collector fan, and the primary crushing bag dust collector rotary feeder will start simultaneously, and the chain conveyor will enter automatic mode.

[0041] Next, the chain conveyor, chain conveyor cooling fan, crusher hydraulic station, secondary twin-shaft shredder, and primary twin-shaft shredder are started in sequence to complete the equipment startup.

[0042] The DCS system of the calcining kiln inlet silo dust collection bag, the calcining kiln inlet silo dust collection rotary feeder, the calcining kiln inlet silo dust collection fan, and the No. 1 bucket elevator controls the operation of the calcining kiln inlet silo dust collection bag, the calcining kiln inlet silo dust collection rotary feeder, and the calcining kiln inlet silo dust collection fan, and controls the start-up of the No. 1 bucket elevator based on the operating status of the calcining kiln inlet silo dust collection bag, the calcining kiln inlet silo dust collection rotary feeder, and the calcining kiln inlet silo dust collection fan.

[0043] After primary crushing, waste lithium batteries require a water-cooled conveyor system to transport the crushed lithium battery raw materials to the next stage for more detailed crushing and sorting. To standardize operating procedures and reduce operational errors during production, a sequential start-up process was designed into the DCS system. The preheated cooling conveyor system includes a single-axis water-cooled screw conveyor, a dual-axis water-cooled screw conveyor, and a single-axis water-cooled screw temperature sensor. The DCS system input is connected to the single-axis water-cooled screw temperature sensor, and the DCS system output is connected to the single-axis water-cooled screw conveyor, the dual-axis water-cooled screw conveyor, and the single-axis water-cooled screw temperature sensor, used to control their start-up according to the sequential control process. First, all equipment to be started is kept in the central control state. The No. 1 belt conveyor is started in advance, and it is confirmed that the temperature of the single-axis water-cooled screw is below the preset alarm value. A one-button start is then activated to sound an alarm to remind on-site personnel to start the conveyor. Next, the single-axis water-cooled screw conveyor starts at a frequency of 6 Hz, followed by the dual-axis water-cooled screw conveyor at a frequency of 2 Hz, completing the start-up process of the conveyor system.

[0044] The waste lithium battery processing system includes a hot blast furnace used to heat and maintain the temperature of the rotary kiln and preheater. Before startup, the chimney passage leading to the outside of the plant needs to be opened. To standardize operating procedures and reduce operational errors, a sequential startup process was designed into the DCS system. The DCS system acquires the hot blast furnace's status information and confirms its readiness. Once in a ready state, it sequentially controls the hot blast furnace inlet fuel actuator and the hot blast coupler fuel solenoid valve to ignite and start the hot blast furnace.

[0045] First, ensure that all equipment to be turned on is in the central control state. After pressing the one-button start, an alarm will sound on site to alert on-site personnel that the flue opening process has begun and to take precautions.

[0046] Once the hot air duct leading to the chimney is opened, the electric actuator at the chimney inlet will fully open, and then the pneumatic actuator leading to the AQC boiler fan will close, completing the opening of the hot air duct to the chimney. This completes the hot air duct opening process.

[0047] Finally, the hot blast stove exhaust fan and the hot blast stove outlet fan switch to automatic mode and start automatically in sequence to complete the start-up process.

[0048] After being crushed and sorted, waste lithium batteries yield a mixture that requires further roasting. This mixture needs to be stored and quantitatively fed into the roasting kiln for roasting tests. To standardize the operating procedures and reduce errors during production, a sequential start-up process was designed into the DCS system. First, all equipment requiring activation is kept under central control. Operation can proceed only after confirming that the weight of the leaching feed hopper has not reached the preset alarm value.

[0049] After one-button start, the on-site alarm bell sounds, reminding on-site personnel that the equipment has entered the start-up process. The dust collectors in the calcining kiln inlet hopper, the rotary feeder for the dust collectors in the calcining kiln inlet hopper, and the dust collector fan in the calcining kiln inlet hopper simultaneously start, and the No. 1 bucket elevator enters automatic mode. Finally, the No. 1 bucket elevator starts, completing the start-up process of the conveying system.

[0050] The waste lithium battery processing system includes a hot air furnace, which provides high-temperature gas to the preheater and rotary kiln within the system. This equipment can generate gas at temperatures exceeding 1000 degrees Celsius and is classified as specialized equipment, requiring multiple devices to work together during startup. To standardize operating procedures and reduce operational errors, a sequential startup process was designed within the DCS system.

[0051] The high-temperature gas channel control subsystem for the hot blast stove includes an electric actuator at the chimney inlet, a pneumatic actuator for the boiler fan, and a blower at the stove outlet. The DCS system controls these actuators to start operating according to a preset mode based on received channel start signals. First, all equipment requiring activation is kept under central control, and peripheral equipment and environmental monitoring devices are free of alarms and malfunctions.

[0052] Before starting the equipment, it is necessary to confirm that all valves at the hot blast stove inlet are closed, the high-temperature flue leading to the AQC boiler is unobstructed, and the hot blast stove outlet fan and hot blast stove inlet fan are turned on in advance. The internal temperature and pressure of the hot blast stove are not in alarm state, and the pressure of the hot blast stove outlet pipeline is less than -50Pa. Only then is the entire hot blast stove equipment officially ready for start-up.

[0053] After one-button start, the on-site alarm bell sounds, reminding personnel that the equipment has entered the start-up process. The combustion blower of the hot blast stove is started, blowing air into the hot blast stove to ensure that there is no residual natural gas inside. After the specified time, the inlet fuel pneumatic actuators of hot blast stove #1 and #3 are activated sequentially to complete the ignition work inside the stove. After confirming that the ignition work has been completed, the inlet fuel pneumatic actuator of hot blast stove #2 and the inlet fuel solenoid valve of the hot blast stove are activated to supply more fuel, completing the start-up of the hot blast stove equipment.

[0054] This application also provides a control method for a roasting system in the pretreatment of waste lithium batteries. The method uses a DCS system to control the opening and closing of the preheater and the preheater chain conveyor based on status signals from the preheater chain conveyor, the conveying and processing equipment off the chain conveyor, the exhaust fan, and the oxygen content sensor. The output of the DCS system is connected to the hydraulic valve at the preheater outlet to control the opening and closing of the hydraulic valve according to a set time.

[0055] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A control system for a roasting system in the pretreatment of waste lithium batteries, characterized in that: The control system includes a preheating subsystem for preheating the disassembled lithium batteries. The preheating subsystem includes a preheater, a preheater chain conveyor, a conveyor and processing device for the chain conveyor, an exhaust fan, an oxygen sensor, and a DCS system. The outputs of the preheater chain conveyor, the conveyor and processing device for the chain conveyor, the exhaust fan, and the oxygen sensor are connected to the DCS system. The DCS system controls the opening and closing of the preheater and the preheater chain conveyor based on status signals from these components. The output of the DCS system is connected to the preheater outlet hydraulic valve to control its opening and closing according to a set time. The output of the DCS system is connected to a field alarm bell, which is used to issue an alarm signal when the preheater equipment is turned on. The control system further includes an air intake subsystem, which comprises a tertiary air duct supply fan, a preheater outlet fan, a calcining kiln outlet cyclone separator, a calcining kiln inlet pneumatic actuator, and an air intake fan. The DCS system controls the tertiary air duct supply fan, preheater outlet fan, calcining kiln outlet cyclone separator, calcining kiln inlet pneumatic actuator, and air intake fan to start and operate according to a set logic. The system also includes a crushing subsystem, which comprises a primary crushing bag dust collector fan, a primary crushing bag dust collector rotary feeder, a chain conveyor, a chain conveyor cooling fan, a secondary twin-shaft shredder, and a primary twin-shaft shredder. The DCS system... The system sequentially controls the start-up of the primary crushing bag dust collector fan, the primary crushing bag dust collector rotary feeder, the chain conveyor, the chain conveyor cooling fan, the secondary twin-shaft shredder, and the primary twin-shaft shredder to achieve start-up control of the crushing system; the control system also includes a material conveying system after crushing and sorting, which includes: dust collector bags in the calcining kiln inlet silo, a dust collector rotary feeder in the calcining kiln inlet silo, and a No. 1 bucket elevator. The DCS... The system controls the operation of the dust collection bags in the inlet hopper of the calcining kiln, the rotary feeder for the dust collection bags in the inlet hopper of the calcining kiln, and the dust collection fan in the inlet hopper of the calcining kiln. Based on the operating status of these components, it controls the activation of the No. 1 bucket elevator. The control system also includes a preheated cooling conveying system, which comprises a single-axis water-cooled screw conveyor, a double-axis water-cooled screw conveyor, and a single-axis water-cooled screw temperature sensor. The input of the DCS system is connected to the single-axis water-cooled screw temperature sensor, and the output of the DCS system is connected to the single-axis water-cooled screw conveyor, the double-axis water-cooled screw conveyor, and the single-axis water-cooled screw temperature sensor, used to control their startup according to the sequential control process. The control system also includes a hot air furnace system for providing hot air. The system acquires the hot blast stove status information and confirms whether the hot blast stove is in a ready state. After it is in a ready state, it sequentially controls the hot blast stove inlet fuel actuator and the hot blast coupler fuel solenoid valve to realize the ignition and start-up of the hot blast stove. The control system also includes a calcining furnace output material water cooling control system, which includes a leaching unfinished material silo bag dust collector, a leaching unfinished material silo bag dust collector rotary feeder, a leaching unfinished material silo bag dust collector fan, a No. 2 bucket elevator, and a water-cooled screw conveyor. The DCS system controls the leaching unfinished material silo bag dust collector, the leaching unfinished material silo bag dust collector rotary feeder, the leaching unfinished material silo bag dust collector fan, the No. 2 bucket elevator, and the water-cooled screw conveyor to start according to a preset sequential control mode based on the acquired start signal.The high-temperature gas channel control subsystem for the hot blast stove includes an electric actuator at the chimney inlet, a pneumatic actuator for the boiler fan, and a blower at the stove outlet. The DCS system controls these actuators to start operating according to a preset mode based on received channel start signals.

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