Ring cooler waste gas zero emission system, control method, equipment and medium thereof

Abstract

The embodiment of the application provides a kind of ring cooling machine exhaust zero emission system and its control method, equipment and medium, belong to steel metallurgy sintering waste heat recovery and environmental protection field.It includes: anti-condensation bypass, from the main pipeline between the gas outlet of waste heat boiler and the inlet of circulating fan, and anti-condensation bypass is sequentially provided with regulating valve, heat exchanger and temperature sensor along the direction of exhaust gas flow;Central controller is configured with PID temperature control module and fuzzy temperature control module, PID temperature control module is used to adjust the speed of circulating fan according to the temperature of first section and second section upper flue gas;Fuzzy temperature control module is used to adjust the speed of circulating fan and the exhaust gas reuse amount between each section according to the hot air temperature at the outlet of third section upper flue;Hot air sintering device includes hot air distribution box and multiple nozzles, the inside of each nozzle is provided with helical guide vane.Avoid low temperature and high humidity environment pipeline condensation corrosion and blockage, and reduce manual intervention, response speed is fast.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery and environmental protection technology in iron and steel metallurgy sintering, specifically to a zero-emission system for exhaust gas from an annular cooler and its control method, equipment, and medium. Background Technology

[0002] The sintering ring cooler generates a large amount of hot waste gas during the cooling of high-temperature sinter (600~800℃). In traditional processes, the waste gas in the high-temperature section (300~450℃) is introduced into the waste heat boiler for heat exchange and then discharged directly, while the waste gas in the medium and low temperature sections (150~300℃ and <150℃) is discharged directly, resulting in heat energy waste and dust pollution.

[0003] In recent years, some companies have attempted to introduce the high-temperature exhaust gas from the first and second stages of the annular cooler into a waste heat boiler, with the boiler outlet exhaust gas then recirculated back to the bottom of the annular cooler. Simultaneously, exhaust gas from the fifth stage is directed to the fourth stage, and from the fourth stage to the third stage, with the third stage exhaust gas used for hot air sintering. While this solution achieves zero emissions and some energy savings, in winter or high-humidity environments, when the exhaust gas from the waste heat boiler (approximately 110°C) mixes with the low-temperature zone (50-80°C) at the bottom of the annular cooler, condensation easily forms on the inner walls of the pipes, leading to pipe corrosion and dust adhesion. In severe cases, this can clog the air ducts, affecting the stable operation of the system. Existing systems rely on manual experience to adjust fans and valves, resulting in delayed response, difficulty in maintaining dynamic balance across multiple exhaust gas stages, and low waste heat recovery efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a zero-emission system for exhaust gas from an annular cooler, as well as its control method, equipment, and medium, which avoids pipe condensation corrosion and blockage in low-temperature and high-humidity environments, reduces manual intervention, and has a fast response speed.

[0005] To achieve the above objectives, embodiments of the present invention provide a zero-emission system for an annular cooler exhaust gas, comprising an annular cooler body, a waste heat boiler, a dust collector, a circulating fan, and a hot air sintering device. The annular cooler body is sequentially divided into five sections along the trolley's running direction. The upper flue outlets of the first and second sections are connected to the air inlet of the waste heat boiler, and the air outlet of the waste heat boiler is connected to the inlet of the circulating fan via the dust collector. The outlet of the circulating fan is connected to the lower cooling air inlet of the first and second sections, respectively. The upper flue outlet of the fifth section is connected to the lower cooling air inlet of the fourth section, and the upper flue outlet of the fourth section is connected to the lower cooling air inlet of the third section. The upper flue outlet of the third section is connected to the hot air sintering device. The zero-emission system for the annular cooler exhaust gas also includes: The anti-condensation bypass is led out from the main pipeline between the outlet of the waste heat boiler and the inlet of the circulating fan, and the anti-condensation bypass is provided with a regulating valve, a heat exchanger and a temperature sensor in sequence along the direction of waste gas flow. The central controller is equipped with a PID temperature control module and a fuzzy temperature control module. The PID temperature control module is used to adjust the speed of the circulating fan according to the exhaust gas temperature of the first and second upper flue. The fuzzy temperature control module is used to simultaneously adjust the speed of the circulating fan and the amount of exhaust gas reused between each section according to the hot air temperature at the outlet of the third upper flue. The hot air sintering device includes a hot air distribution box and multiple nozzles, each of which has a spiral guide vane inside.

[0006] Optionally, the heat exchanger is a shell-and-tube heat exchanger. The shell-side inlet of the shell-and-tube heat exchanger is connected to the upper flue of the first or second stage of the annular cooler through a pipeline, and the shell-side outlet is connected back to the upper flue through a pipeline. Bypass exhaust gas is introduced into the tube side of the shell-and-tube heat exchanger. The temperature sensor is located on the outlet side of the shell-and-tube heat exchanger. The anti-condensation bypass is also equipped with an automatic drain valve before the inlet of the shell-and-tube heat exchanger to drain the condensate generated before preheating.

[0007] Optionally, the central controller is connected to the regulating valve, the ambient temperature sensor, the ambient humidity sensor, and the circulating fan; The central controller is also equipped with a bypass activation determination module, which is used to automatically open the regulating valve when the ambient temperature sensor detects that the ambient temperature is less than or equal to the lower limit of the ambient temperature and the ambient humidity sensor detects that the relative humidity is greater than or equal to the upper limit of the ambient humidity. Then, a portion of the boiler outlet exhaust gas is introduced into the shell-and-tube heat exchanger to be preheated to a temperature not lower than the preset anti-condensation temperature, and then mixed with the main pipeline exhaust gas before entering the circulating fan. When the ambient temperature is greater than the lower limit of the ambient temperature or the relative humidity is less than the upper limit of the ambient humidity, the central controller closes the regulating valve and cuts off the anti-condensation bypass.

[0008] Optionally, the fuzzy temperature control module is configured with the following fuzzy rule table: If the outlet hot air temperature of the third stage is <200℃ and the temperature change rate is negative, then reduce the speed of the circulating fan and reduce the amount of waste gas reused from the fifth stage to the fourth stage and from the fourth stage to the third stage. If the outlet hot air temperature of the third stage is >240℃ and the temperature change rate is positive, then increase the speed of the circulating fan and increase the amount of waste gas reused from the fifth stage to the fourth stage and from the fourth stage to the third stage. If the hot air temperature at the outlet of the three sections is between 200 and 240°C, then maintain the current operating parameters.

[0009] Optionally, the plurality of nozzles are evenly arranged along the width direction of the sintering machine trolley, and the spray angle of each nozzle is adjustable in the range of 20° to 60°. An inlet electric regulating valve is installed at the inlet of the hot air distribution box. The central controller dynamically adjusts the opening of the inlet electric valve according to the three-stage outlet hot air temperature and the sintering machine speed to ensure that the vertical sintering speed fluctuation does not exceed ±5%.

[0010] Secondly, the present invention also provides a method for zero-emission control of exhaust gas from an annular cooler, comprising: The circulating fan is started to introduce the high-temperature exhaust gas discharged from the upper flue of the first and second sections of the circulating cooler into the waste heat boiler for heat exchange. After heat exchange, the exhaust gas is sent back to the lower cooling air inlet of the first and second sections by the circulating fan after dust removal. The speed of the circulating fan is adjusted by the PID temperature control module to control the boiler inlet temperature. The exhaust gas from the upper part of the fifth stage is directed to the bottom of the fourth stage, and the exhaust gas from the upper part of the fourth stage is directed to the bottom of the third stage, so as to achieve cascade reuse. The ambient temperature and humidity are monitored in real time. When the preset bypass start-up conditions are met, the regulating valve on the anti-condensation bypass is automatically opened, and part of the boiler outlet exhaust gas is introduced into the heat exchanger for preheating before being mixed into the main pipeline at the inlet of the circulating fan. The exhaust gas, heated in the upper three sections, is introduced into the hot air sintering device. After being distributed by the hot air distribution box, it is sprayed out by nozzles with internal spiral guide vanes and acts on the sintering mixture on the sintering machine trolley.

[0011] Optionally, the preset bypass activation conditions are: the ambient temperature is less than or equal to the lower limit of the ambient temperature and the relative humidity is greater than or equal to the upper limit of the ambient humidity, and the heat exchanger preheating temperature is not lower than the preset anti-condensation temperature.

[0012] Optionally, before opening the bypass, the condensate in the anti-condensation bypass can be drained through the automatic drain valve located before the inlet of the anti-condensation bypass heat exchanger.

[0013] Thirdly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the above-described zero-emission control method for the exhaust gas of the annular cooler.

[0014] Fourthly, the present invention also provides a storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of the above-described zero-emission control method for exhaust gas from an annular cooler.

[0015] Through the above technical solutions Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a zero-emission system for an annular cooler exhaust gas provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of an anti-condensation bypass structure provided in an embodiment of the present invention; Figure 3 This is a cross-sectional view of a hot air sintering nozzle provided in an embodiment of the present invention; Figure 4 This is a flowchart illustrating the implementation of a zero-emission control method for exhaust gas from an annular cooler, as provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures 1. Circulating cooler body; 2. Waste heat boiler; 3. Dust collector; 4. Circulating fan; 5. Hot air sintering device; 50. Hot air distribution box; 51. Nozzle; 510. Spiral guide vane; 6. Anti-condensation bypass; 60. Electric regulating valve; 61. Shell and tube heat exchanger; 62. Temperature sensor; 63. Drain valve; 7. Central controller; 8. Sintering machine; 9. Sintering mixture layer. Detailed Implementation

[0018] Various embodiments of this disclosure will be described more fully in the following detailed description. This disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of this disclosure to the specific embodiments disclosed herein, but rather this disclosure should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of this disclosure.

[0019] In the following, the terms “comprising” or “may include”, which may be used in various embodiments of this disclosure, indicate the presence of the disclosed functions or operations and do not limit the addition of one or more functions or operations. Furthermore, as used in various embodiments of this disclosure, the terms “comprising,” “having,” and their cognates are intended only to indicate a specific feature, number, step, operation, or combination of the foregoing and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, or combinations of the foregoing, or the possibility of adding one or more features, numbers, steps, operations, or combinations of the foregoing.

[0020] In various embodiments of this disclosure, the expression "or" or "at least one of A and / or B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A and / or B" may include A, may include B, or may include both A and B.

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] See Figure 1 The diagram shown is a structural schematic of a zero-emission system for an annular cooler exhaust gas in a specific embodiment, including: The system comprises an annular cooler body 1, a waste heat boiler 2, a dust collector 3, a circulating fan 4, and a hot air sintering device 5. The annular cooler body 1 is divided into five sections along the trolley's running direction. The upper flue outlets of the first and second sections are connected to the air inlet of the waste heat boiler 2. The air outlet of the waste heat boiler 2 is connected to the inlet of the circulating fan 4 via the dust collector 3. The outlet of the circulating fan 4 is connected to the lower cooling air inlet of the first and second sections, respectively. The upper flue outlet of the fifth section is connected to the lower cooling air inlet of the fourth section, and the upper flue outlet of the fourth section is connected to the lower cooling air inlet of the third section. The upper flue outlet of the third section is connected to the hot air sintering device 5. The zero-emission system for the annular cooler exhaust gas also includes: The anti-condensation bypass 6 is led out from the main pipeline between the outlet of the waste heat boiler 2 and the inlet of the circulating fan 4, and the anti-condensation bypass 6 is provided with a regulating valve, a heat exchanger and a temperature sensor in sequence along the direction of waste gas flow. The central controller 7 is equipped with a PID temperature control module and a fuzzy temperature control module. The PID temperature control module is used to adjust the speed of the circulating fan 4 according to the exhaust gas temperature of the first and second upper flue. The fuzzy temperature control module is used to simultaneously adjust the speed of the circulating fan 4 and the amount of exhaust gas reused between each section according to the hot air temperature at the outlet of the third upper flue. The hot air sintering device 5 includes a hot air distribution box 50 and a plurality of nozzles 51, each of which has a spiral guide vane inside.

[0023] Preferably, the heat exchanger is a shell-and-tube heat exchanger. The shell-side inlet of the shell-and-tube heat exchanger is connected to the upper flue of the first or second stage of the annular cooler through a pipeline, and the shell-side outlet is connected back to the upper flue through a pipeline. Bypass exhaust gas is introduced into the tube side of the shell-and-tube heat exchanger. The temperature sensor is located on the outlet side of the shell-and-tube heat exchanger. The anti-condensation bypass 6 is also equipped with an automatic drain valve before the inlet of the shell-and-tube heat exchanger to drain the condensate generated before preheating.

[0024] Specifically, the central controller 7 is connected to the regulating valve, the ambient temperature sensor, the ambient humidity sensor, and the circulating fan 4.

[0025] The central controller 7 is also equipped with a bypass activation determination module, which is used to automatically open the regulating valve when the ambient temperature sensor detects that the ambient temperature is less than or equal to the lower limit of the ambient temperature and the ambient humidity sensor detects that the relative humidity is greater than or equal to the upper limit of the ambient humidity, and introduce part of the boiler outlet exhaust gas into the shell-and-tube heat exchanger to preheat it to a temperature not lower than the preset anti-condensation temperature, and then mix it with the exhaust gas from the main pipeline into the circulating fan; when the ambient temperature is greater than the lower limit of the ambient temperature or the relative humidity is less than the upper limit of the ambient humidity, the central controller 7 closes the regulating valve and cuts off the anti-condensation bypass 6.

[0026] For example, see Figure 2 The diagram shows a schematic of an anti-condensation bypass structure provided in an embodiment of the present invention. A bypass pipe is led out from the pipeline between the outlet of the waste heat boiler and the inlet of the circulating fan 4. An electric regulating valve 60, a shell-and-tube heat exchanger 61, and a temperature sensor 62 are sequentially installed on the bypass pipe. The shell-side inlet of the shell-and-tube heat exchanger 61 is connected to the upper flue of the first or second stage of the circulating cooler, and the shell-side outlet returns to the flue; bypass exhaust gas is introduced into the tube side. An automatic drain valve 63 is installed at the lowest point before the heat exchanger inlet of the bypass pipe to drain condensate that may be generated before preheating. When the ambient temperature is ≤5℃ and the relative humidity is ≥80%, the central controller 7 automatically opens the electric regulating valve 60, introducing part of the boiler outlet exhaust gas (approximately 110℃) into the shell-and-tube heat exchanger 61 for preheating to ≥140℃, and then mixing it with the main exhaust gas before entering the circulating fan, thereby avoiding condensation.

[0027] It should be noted that the fuzzy temperature control module is configured with the following fuzzy rule table: If the outlet hot air temperature of the third stage is <200℃ and the temperature change rate is negative, then reduce the speed of the circulating fan and reduce the amount of waste gas reused from the fifth stage to the fourth stage and from the fourth stage to the third stage. If the outlet hot air temperature of the third stage is >240℃ and the temperature change rate is positive, then increase the speed of the circulating fan and increase the amount of waste gas reused from the fifth stage to the fourth stage and from the fourth stage to the third stage. If the hot air temperature at the outlet of the three sections is between 200 and 240°C, then maintain the current operating parameters.

[0028] For example, if the outlet hot air temperature of the three stages is <200℃ and the temperature change rate is negative, then the speed of the circulating fan and the amount of waste gas reused will be reduced to 20%~25% of the current value, causing the temperature to rise back to 200~240℃. If the outlet hot air temperature of the three stages is >240℃ and the temperature change rate is positive, then the speed of the circulating fan and the amount of waste gas reused will be increased to 25%~30%, causing the temperature to drop back to 200~240℃.

[0029] In addition, the central controller 7 is connected to the following sensors: temperature sensors (T1~T5) and pressure sensors (P1~P5) of the upper flue of each section; temperature sensors and flow meters of the cooling air inlet of each section; hot air outlet temperature sensor (T3_out) of the three sections; ambient temperature sensor and humidity sensor; and frequency converter feedback for the circulating fan and the cooling fan of each section.

[0030] In one specific implementation, the boiler inlet temperature is controlled by PID: the average temperature of the exhaust gas in the upper flue of the first and second sections is used as the target value (set value 360℃), and the speed of the circulating fan 4 is adjusted by PID algorithm to keep the average value between 320~400℃.

[0031] Three-stage outlet temperature fuzzy control: The target value is set at 220℃, with an allowable fluctuation of ±20℃. The central controller 7 adjusts the circulating fan speed and the waste gas reuse volume from stage 5 to stage 4 and stage 4 to stage 3 based on the deviation of T3_out from the target value and its rate of change, using a fuzzy rule table. Specific rules: If T3_out < 200℃ and the temperature deviation rate of change is negative and its absolute value is greater than the preset rate of change threshold, then the circulating fan speed 4 is reduced and the stage reuse air volume is reduced; if T3_out > 240℃ and the temperature deviation rate of change is positive and its absolute value is greater than the preset rate of change threshold, then the circulating fan speed 4 is increased and the stage reuse air volume is increased; if T3_out is between 200 and 240℃, the current parameters are maintained.

[0032] For example, the preset rate of change threshold is 5°C / min.

[0033] Anti-condensation bypass condition control: When the ambient temperature is ≤5℃ and the relative humidity is ≥80%, the bypass electric valve will be opened automatically, and PID regulation will be performed with the bypass outlet gas temperature of 140℃ as the target.

[0034] Specifically, the multiple nozzles 51 are evenly arranged along the width of the sintering machine 8, and the spray angle of each nozzle 51 is adjustable within the range of 20° to 60°; the inlet of the hot air distribution box 50 is provided with an inlet electric regulating valve, and the central controller 7 dynamically adjusts the opening of the inlet electric valve according to the three-stage outlet hot air temperature and the speed of the sintering machine 8 to ensure that the vertical sintering speed fluctuation does not exceed ±5%.

[0035] For example, seeFigure 3 The diagram shows a cross-sectional view of a hot air sintering nozzle according to an embodiment of the present invention. The hot air sintering device includes a hot air distribution box 50 and multiple nozzles 51. The nozzles 51 are evenly arranged along the width direction of the sintering machine, with a preferred spacing of 300-500 mm. Each nozzle 51 has a spiral guide vane 510 inside, which causes the hot air to be ejected in a rotating manner, increasing the contact area and penetration depth with the sintering mixture layer 9. The spray angle α of the nozzle 51 can be manually or automatically adjusted within the range of 20° to 60°. An electric regulating valve is provided at the inlet of the hot air distribution box 50 to dynamically adjust the total hot air volume according to the sintering machine speed and the thickness of the material layer.

[0036] For example, the adjustment process of the injection angle α is as follows: The central controller 7 performs the following calculations based on the hot air temperature signal fed back by the temperature sensor T3_out located at the outlet of the upper three-section flue, the real-time operating speed signal of the sintering machine, and the material layer thickness detection signal: First, the central controller 7 uses the deviation value and its rate of change between the real-time hot air temperature T3_out at the outlet of the upper three-section flue and the preset target temperature of 220℃ as input variables, performs fuzzy inference based on the built-in fuzzy rule table, and outputs the required hot air penetration intensity adjustment amount under this working condition; at the same time, based on the real-time operating speed signal of the sintering machine and the material layer thickness detection signal, it calculates the total heat demand required for hot air sintering under the current working condition. By combining the calibration relationship between the spray angle of nozzle 51 and the hot air penetration depth, the target spray angle and the target opening degree of the electric regulating valve 60 at the inlet of the hot air distribution box 50 are determined to match the hot air penetration intensity adjustment amount. Finally, the central controller 7 converts the calculated target spray angle into a control command and outputs it to the electric actuator connected to each nozzle 51, driving each nozzle 51 to rotate synchronously or in sections to the target angle to adapt to the hot air penetration requirements under different working conditions. At the same time, the central controller 7 dynamically adjusts the opening degree of the electric regulating valve 60 at the inlet of the hot air distribution box 50 according to the target opening degree to adjust the total hot air volume entering the hot air distribution box 50, ensuring that the vertical sintering speed fluctuation does not exceed ±5%.

[0037] The calibration relationship is established in advance in the following manner: Using fixed material layer thickness, hot air temperature, and total inlet air volume as benchmarks, multiple injection angle levels are selected. The depth of hot air penetration into the material layer at each injection angle level is measured. Data fitting is performed with injection angle as the independent variable and penetration depth as the dependent variable to obtain a calibration curve or calibration data table. The central controller performs fuzzy inference based on the deviation and rate of change of the hot air temperature at the outlet of the three upper flues from the target temperature, outputs the required hot air penetration intensity adjustment, and calculates the target penetration depth by combining the sintering machine speed signal and the current material layer thickness signal. Then, the target penetration depth is substituted into the calibration curve or the calibration data table is looked up to calculate the target injection angle, which is output to the electric actuator connected to each nozzle to drive each nozzle to rotate to the target injection angle.

[0038] In one specific implementation, the basic parameters are set as follows: sinter temperature 600~800℃, first and second stage exhaust gas temperature 280~420℃, and third stage outlet temperature 100~150℃. Anti-condensation bypass: Ø400mm pipes are used, with a shell-and-tube heat exchanger (heat exchange area 50m², tube side material 316L stainless steel). The bypass electric regulating valve is a DN400 electric butterfly valve. The control system is equipped with a Siemens S7-1500 PLC, a PT100 temperature sensor (accuracy ±0.2℃), and a capacitive humidity sensor (accuracy ±3%RH). Operating conditions: winter ambient temperature -10℃, humidity 85%. When the controller detects that the temperature and humidity conditions are met, it automatically opens the bypass. The bypass flow rate accounts for 20% of the circulating air volume. First stage upper exhaust gas (350℃) is introduced into the heat exchanger tube side, and the shell-side outlet exhaust gas temperature rises to 145℃. After mixing with the main flow, the temperature is approximately 117℃, and there is no condensation on the inner wall of the pipe. Hot air sintering nozzles: 16 nozzles are installed, with an inner diameter of 80mm and built-in spiral guide vanes, and a spray angle of 30°. The three-stage outlet temperature is stable at 215~225℃. Other hot steam production is increased, solid fuel consumption is reduced, drum index is improved, screening index is decreased, and no pipeline leaks were observed after 12 months of continuous operation.

[0039] In one specific implementation, a predictive control module is added. The controller is connected to the factory's MES system to obtain the ambient temperature forecast and sinter production plan for the next 30 minutes in advance. When the predicted ambient temperature will drop below 0°C, the anti-condensation bypass is activated 15 minutes in advance, and the circulating fan speed is increased, allowing the system temperature to reach a stable state earlier. Actual measurements show that the temperature fluctuations in the three stages are further reduced, and solid fuel consumption is further decreased.

[0040] By providing a zero-emission system for the exhaust gas of the annular cooler with optimized structure, intelligent control, strong adaptability, and stable operation, it achieves stable operation throughout the year, maximizes the utilization of waste heat, and improves the quality of sintered ore, while meeting ultra-low emission standards.

[0041] like Figure 4As shown, the following are embodiments of the zero-emission control method for exhaust gas from an annular cooler provided in this disclosure. These embodiments belong to the same inventive concept as the zero-emission systems for exhaust gas from an annular cooler described above. For details not described in detail in the embodiments of the zero-emission control method for exhaust gas from an annular cooler, please refer to the embodiments of the zero-emission system for exhaust gas from an annular cooler described above.

[0042] S400: Start the circulating fan to introduce the high-temperature exhaust gas discharged from the upper flue of the first and second sections of the circulating cooler into the waste heat boiler for heat exchange. After heat exchange, the exhaust gas is sent back to the lower cooling air inlet of the first and second sections by the circulating fan after dust removal. The speed of the circulating fan is adjusted by the PID temperature control module to control the boiler inlet temperature.

[0043] It should be noted that the exhaust gas temperature in the upper part of the first and second stages is between 280 and 420°C. After heat exchange, the exhaust gas temperature is about 110°C. The speed of the circulating fan is adjusted by the PID temperature control module to control the boiler inlet temperature to be stable at 320 to 400°C.

[0044] S401: The exhaust gas from the upper part of the fifth stage is directed to the bottom of the fourth stage, and the exhaust gas from the upper part of the fourth stage is directed to the bottom of the third stage, so as to achieve cascade reuse.

[0045] Specifically, all the exhaust gas from the upper part of the fifth stage (80~120℃) is directed to the bottom of the fourth stage; all the exhaust gas from the upper part of the fourth stage (120~160℃) is directed to the bottom of the third stage. The air volume for cascade reuse is controlled by the frequency converter of the cooling fans in the fifth and fourth stages, and is linked to the outlet temperature of the third stage.

[0046] S402: Real-time monitoring of ambient temperature and humidity. When the preset bypass activation conditions are met, the regulating valve on the anti-condensation bypass is automatically opened, and part of the boiler outlet exhaust gas is introduced into the heat exchanger for preheating before being mixed into the main pipeline at the inlet of the circulating fan.

[0047] Specifically, the preset bypass activation conditions are: the ambient temperature is less than or equal to the lower limit of the ambient temperature and the relative humidity is greater than or equal to the upper limit of the ambient humidity, and the heat exchanger preheating temperature is not lower than the preset anti-condensation temperature.

[0048] For example, the system monitors ambient temperature and humidity in real time. If the ambient temperature is ≤5℃ and the relative humidity is ≥80%, the bypass electric regulating valve is automatically opened to introduce a portion of the boiler outlet exhaust gas into the heat exchanger for preheating to ≥140℃ before mixing it into the circulating fan inlet. If the ambient temperature is >5℃ or the relative humidity is <80%, the bypass is closed.

[0049] Furthermore, before opening the bypass, the condensate in the anti-condensation bypass is drained through the automatic drain valve located before the inlet of the anti-condensation bypass heat exchanger.

[0050] S403: The exhaust gas after the three-stage upper heating is introduced into the hot air sintering device. After being distributed by the hot air distribution box, it is sprayed out by the nozzle with the internal spiral guide vane and acts on the sintering mixture on the sintering machine trolley.

[0051] Specifically, the exhaust gas (target temperature 200~250℃) heated in the upper three sections is introduced into the hot air sintering unit. The opening of the inlet valve of the hot air distribution box is jointly regulated by the outlet temperature of the three sections and the speed of the sintering machine to ensure that the vertical sintering speed fluctuation does not exceed ±5%.

[0052] All waste gas is recycled and reused, with no external discharge. The control system scans each sensor every 10 seconds, dynamically adjusting the fan speed and valve opening to ensure system stability.

[0053] This application has the following beneficial effects: A new anti-condensation bypass is added, which can raise the minimum temperature of the circulating exhaust gas from 85℃ to above 115℃ in winter (-10℃) or high humidity environments (RH≥85%), effectively preventing condensation corrosion. The adoption of PID + fuzzy rule composite control reduces temperature fluctuations in the three-stage outlet hot air, stabilizes the hot air sintering effect, and reduces solid fuel consumption; it also reduces manual intervention, has a fast response speed, and adapts to production fluctuations.

[0054] Figure 5 This is a schematic diagram of the hardware structure of an electronic device that implements various embodiments of the present invention.

[0055] Electronic devices may include processors, external memory interfaces, internal memory, universal serial bus (USB) interfaces, charging management modules, power management modules, batteries, wireless communication modules, audio modules, speakers, microphones, sensor modules, buttons, cameras, displays, and SIM card interfaces, etc.

[0056] It is understood that the structures illustrated in the embodiments of this application do not constitute a specific limitation on the electronic device. In other embodiments of this application, the electronic device may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0057] A processor may include one or more processing units, such as: a central processing unit (CPU), an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, memory, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural network processing unit (NPU). Different processing units may be independent devices or integrated into one or more processors.

[0058] The processor can serve as the nerve center and command center of an electronic device. The controller can generate operation control signals based on the instruction opcode and timing signals to control the fetching and execution of instructions.

[0059] The processor may also include memory for storing instructions and data. In some embodiments, the memory in the processor is a cache memory. This memory can store instructions or data that the processor has just used or that are used repeatedly. If the processor needs to use the instruction or data again, it can retrieve it directly from this memory. This avoids repeated accesses, reduces processor latency, and thus improves system efficiency.

[0060] An external storage interface (ESI) can be used to connect external memory cards, such as microSD cards, to expand the storage capacity of electronic devices. The external memory card communicates with the processor through the ESI to perform data storage functions, such as saving music and video files on the external memory card.

[0061] Internal memory can be used to store computer executable program code, which includes instructions. The processor executes various functional applications and data processing of electronic devices by running the instructions stored in internal memory. Internal memory can include a program storage area and a data storage area. Internal memory can include high-speed random access memory, and can also include non-volatile memory, such as at least one disk storage device, flash memory device, universal flash storage (UFS), etc.

[0062] Wireless communication functionality in electronic devices can be achieved through antennas, wireless communication modules, modem processors, and baseband processors.

[0063] Wireless communication modules can provide solutions for wireless communication applications in electronic devices, including wireless LAN, Bluetooth, global navigation satellite system, frequency modulation, short-range wireless communication technology, infrared technology, and other wireless communication technologies.

[0064] Electronic devices can implement audio functions through audio modules, speakers, receivers, microphones, headphone jacks, and application processors.

[0065] Electronic devices can achieve shooting functions through ISPs, cameras, video codecs, GPUs, displays, and application processors.

[0066] Electronic devices can achieve display functions through GPUs, displays, and application processors.

[0067] A GPU is a microprocessor for image processing, connected to the display screen and application processor. GPUs are used to perform mathematical and geometric calculations for graphics rendering. A processor may include one or more GPUs, which execute program instructions to generate or modify display information.

[0068] A display screen is used to display images, videos, etc. A display screen includes a display panel.

[0069] The storage medium provided in this application stores a program product capable of achieving a zero-emission method for exhaust gas from an annular cooler.

[0070] The zero-emission control method for exhaust gas from the annular cooler includes: starting the circulating fan to introduce the high-temperature exhaust gas discharged from the upper flues of the first and second sections of the annular cooler into the waste heat boiler for heat exchange; after heat exchange, the exhaust gas is sent back to the lower cooling air inlet of the first and second sections by the circulating fan after dust removal; adjusting the speed of the circulating fan through the PID temperature control module to control the boiler inlet temperature; guiding the exhaust gas from the upper section of the fifth section to the bottom of the fourth section, and guiding the exhaust gas from the upper section of the fourth section to the bottom of the third section to achieve cascade reuse; monitoring the ambient temperature and humidity in real time, and automatically opening the regulating valve on the anti-condensation bypass when the preset bypass conditions are met, introducing part of the boiler outlet exhaust gas into the heat exchanger for preheating, and then mixing it into the main pipeline at the inlet of the circulating fan; introducing the heated exhaust gas from the upper section of the third section into the hot air sintering device, which is then distributed by the hot air distribution box and sprayed out by nozzles with internal spiral guide vanes, acting on the sintering mixture on the sintering machine trolley.

[0071] The storage medium disclosed herein may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0072] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A zero-emission system for exhaust gas from an annular cooler, comprising an annular cooler body, a waste heat boiler, a dust collector, a circulating fan, and a hot air sintering device. The annular cooler body is sequentially divided into five sections along the direction of trolley operation. The upper flue outlets of the first and second sections are connected to the air inlet of the waste heat boiler. The air outlet of the waste heat boiler is connected to the inlet of the circulating fan via the dust collector. The outlet of the circulating fan is connected to the lower cooling air inlet of the first and second sections, respectively. The upper flue outlet of the fifth section is connected to the lower cooling air inlet of the fourth section. The upper flue outlet of the fourth section is connected to the lower cooling air inlet of the third section. The upper flue outlet of the third section is connected to the hot air sintering device. Its features are, The zero-emission system for the annular cooler exhaust gas also includes: The anti-condensation bypass is led out from the main pipeline between the outlet of the waste heat boiler and the inlet of the circulating fan, and the anti-condensation bypass is provided with a regulating valve, a heat exchanger and a temperature sensor in sequence along the direction of waste gas flow. The central controller is equipped with a PID temperature control module and a fuzzy temperature control module. The PID temperature control module is used to adjust the speed of the circulating fan according to the exhaust gas temperature of the first and second upper flue. The fuzzy temperature control module is used to simultaneously adjust the speed of the circulating fan and the amount of exhaust gas reused between each section according to the hot air temperature at the outlet of the third upper flue. The hot air sintering device includes a hot air distribution box and multiple nozzles, each of which has a spiral guide vane inside.

2. The zero-emission system for exhaust gas from the annular cooler according to claim 1, characterized in that, The heat exchanger is a shell-and-tube heat exchanger. The shell-side inlet of the shell-and-tube heat exchanger is connected to the upper flue of the first or second stage of the annular cooler through a pipeline, and the shell-side outlet is connected back to the upper flue through a pipeline. Bypass exhaust gas is introduced into the tube side of the shell-and-tube heat exchanger. The temperature sensor is located on the outlet side of the shell-and-tube heat exchanger. The anti-condensation bypass is also equipped with an automatic drain valve before the inlet of the shell-and-tube heat exchanger to drain the condensate generated before preheating.

3. The zero-emission system for exhaust gas from the annular cooler according to claim 2, characterized in that, The central controller is connected to the regulating valve, the ambient temperature sensor, the ambient humidity sensor, and the circulating fan; The central controller is also equipped with a bypass activation determination module, which is used to automatically open the regulating valve when the ambient temperature sensor detects that the ambient temperature is less than or equal to the lower limit of the ambient temperature and the ambient humidity sensor detects that the relative humidity is greater than or equal to the upper limit of the ambient humidity. Then, a portion of the boiler outlet exhaust gas is introduced into the shell-and-tube heat exchanger to be preheated to a temperature not lower than the preset anti-condensation temperature, and then mixed with the main pipeline exhaust gas before entering the circulating fan. When the ambient temperature is greater than the lower limit of the ambient temperature or the relative humidity is less than the upper limit of the ambient humidity, the central controller closes the regulating valve and cuts off the anti-condensation bypass.

4. The zero-emission system for exhaust gas from the annular cooler according to claim 1, characterized in that, The fuzzy temperature control module is configured with the following fuzzy rule table: If the outlet hot air temperature of the third stage is <200℃ and the temperature change rate is negative, then reduce the speed of the circulating fan and reduce the amount of waste gas reused from the fifth stage to the fourth stage and from the fourth stage to the third stage. If the outlet hot air temperature of the third stage is >240℃ and the temperature change rate is positive, then increase the speed of the circulating fan and increase the amount of waste gas reused from the fifth stage to the fourth stage and from the fourth stage to the third stage. If the hot air temperature at the outlet of the three sections is between 200 and 240°C, then maintain the current operating parameters.

5. The zero-emission system for exhaust gas from the annular cooler according to claim 1, characterized in that, The multiple nozzles are evenly arranged along the width of the sintering machine trolley, and the spray angle of each nozzle is adjustable within the range of 20° to 60°. An inlet electric regulating valve is installed at the inlet of the hot air distribution box. The central controller dynamically adjusts the opening of the inlet electric valve according to the three-stage outlet hot air temperature and the sintering machine speed to ensure that the vertical sintering speed fluctuation does not exceed ±5%.

6. A method for zero-emission control of exhaust gas from an annular cooler, characterized in that, include: The circulating fan is started to introduce the high-temperature exhaust gas discharged from the upper flue of the first and second sections of the circulating cooler into the waste heat boiler for heat exchange. After heat exchange, the exhaust gas is sent back to the lower cooling air inlet of the first and second sections by the circulating fan after dust removal. The speed of the circulating fan is adjusted by the PID temperature control module to control the boiler inlet temperature. The exhaust gas from the upper part of the fifth stage is directed to the bottom of the fourth stage, and the exhaust gas from the upper part of the fourth stage is directed to the bottom of the third stage, so as to achieve cascade reuse. The ambient temperature and humidity are monitored in real time. When the preset bypass start-up conditions are met, the regulating valve on the anti-condensation bypass is automatically opened, and part of the boiler outlet exhaust gas is introduced into the heat exchanger for preheating before being mixed into the main pipeline at the inlet of the circulating fan. The exhaust gas, heated in the upper three sections, is introduced into the hot air sintering device. After being distributed by the hot air distribution box, it is sprayed out by nozzles with internal spiral guide vanes and acts on the sintering mixture on the sintering machine trolley.

7. The zero-emission control method for exhaust gas from an annular cooler according to claim 6, characterized in that, The preset bypass activation conditions are: the ambient temperature is less than or equal to the lower limit of the ambient temperature and the relative humidity is greater than or equal to the upper limit of the ambient humidity, and the heat exchanger preheating temperature is not lower than the preset anti-condensation temperature.

8. The zero-emission control method for exhaust gas from an annular cooler according to claim 6, characterized in that, Before opening the bypass, drain the condensate in the anti-condensation bypass through the automatic drain valve located before the inlet of the anti-condensation bypass heat exchanger.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the zero-emission control method for exhaust gas from the annular cooler as described in any one of claims 6 to 8.

10. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the zero-emission control method for exhaust gas from the annular cooler as described in any one of claims 6 to 8.

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